Optically active naphthalene derivatives

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to novel optically active compounds each containing a naphthalene skeleton and to liquid crystal compositions containing these compounds.
2. Description of the Prior Art
Presently, various kinds of liquid crystal display devices are used in many fields because the display operation of these elements is advantageously possible at a low voltage, in a low consumption of electric power and in a thin form and because they are photoreceptive and therefore conveniently they do not cause eyes of operators to get tired.
Above all, TN (twisted nematic) type display systems each employing a nematic liquid crystal are utilized in an extensive range. However, these display systems have the drawback that a response speed is low.
The advancement of the recent industrial technology strongly requires a rapid responsivity even in the field of the liquid crystal devices, and in reply to such a requirement, many attemps have been made by improving materials for the liquid crystals. As one example which can meet the above-mentioned demand, a display device has been already suggested in which a photoswitching phenomenon of a ferroelectric liquid crystal is utilized [Appl. Phys. Lett., 36, 899 (1980)]. As a liquid crystal phase for the ferroelectric liquid crystal, a chiral smectic C (SC*) phase is practically desirable, and some of the liquid crystal compounds showing the chiral smectic C phase have been heretofore investigated. Typical examples of these liquid crystal compounds are set forth in Table 1.
With regard to the ferroelectric liquid crystal compounds each having a naphthalene skeleton, Japanese Patent Laid-Open Publication No. 248,790/1985 suggests the possibility of the presence of their compounds but does not refer to concrete examples of such compounds. In this technical field, it cannot be presumed at all at present what skeleton in the compound causes the ferroelectric properties in the liquid crystal and what physical properties the ferroelectric liquid crystal has. The inventors of the present application have found that liquid crystal compounds each having the naphthalene skeleton show remarkably excellent characteristics to compounds exemplified in the aforesaid patent publication, and the present invention has been completed on the basis of the found knowledge.
The conventional compounds in Table 1 may isomerize in a short period of time by light and may hydrolyze due to existent water, so that they come to have no liquid crystal phase any more at times. The compounds having such unstable factors are practically unpreferable as materials for various optical elements of displays and the like.
TABLE 1__________________________________________________________________________Chemical Structure Phase Transition__________________________________________________________________________ ##STR3## ##STR4## ##STR5## ##STR6## ##STR7## ##STR8##__________________________________________________________________________ The compounds 1 and 2 above are described in J. Physique, 37, C3129 (1976). The compound 3 is described in Mol. Cryst. Liq. Cryst. Letters, 82, 61 (1982).
SUMMARY OF THE INVENTION
An object of the present invention is to provide compounds which are useful as novel ferroelectric liquid crystal materials or constitutional components of liquid crystal compositions having an excellent photostability and chemical stability.
Further, another object of the present invention is to provide liquid crystal compositions which are suitable for liquid crystal devices having a rapid responsivity.
The present invention is directed to optically active naphthalene derivatives represented by the general formula (I) and liquid crystal compositions each containing at least one of these derivatives: ##STR9## wherein X is a hydrogen atom, a halogen atom, a cyano group, an alkyl group or methoxy group, latter two groups each having 1 or 2 carbon atoms; and A and B are independently represented by following formula and at least one of them contains an asymmetric carbon atom ##STR10## wherein C and D rings are independent and each of them is a 1,4-phenylene, 2,6-naphthylene, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene, trans-1,3-dioxan-2,5-diyl, trans-1,3-oxathian-2,5-diyl, trans-1,3-dithian-2,5-diyl or 1,3,2-dioxaborinane-2,5-diyl group, these groups may be monosubstituted or multisubstituted by X; each of m and n is an integer of 0, 1 or 2; each of Z.sub.1, Z.sub.2, Z.sub.3 and Z.sub.4 is a bonding group of one or more selected from the group consisting of a single bond, --C(O)--, --O--, --CH.sub.2 --, --CH.dbd.N--, --N.dbd.CH--, --CH.dbd.CH--, --C.tbd.C--, --N.dbd.N-- and --N(O).N--; and Y is a hydrogen atom, a halogen atom, a cyano group, a straight-chain or branched alkyl group or an alkenylalkyl group latter two groups each having 1 to 20 carbon atoms n which in its alkyl portion, one CH.sub.2 group or two unadjacent CH.sub.2 groups may be replaced with --O--, --C(O)--, --O--C(O)-- or --C(O)--O-- and one hydrogen atom may be replaced with a halogen atom, a cyano group or an alkoxyl group.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In order to solve the above-mentioned problems, the inventors of the present application have snythesized and investigated many liquid crystal compounds each containing an optically active group, and as a result, the present invention has been reached.
Most of the compounds having the above-mentioned general formula (I) can singly show a chiral smectic C phase which is important as a ferroelectric liquid crystal phase.
Some of the compounds having the general formula (I) show the smectic A phase and/or chiral nematic (cholesteric) phase only but do not exhibit any chiral smectic C phase, or some of them do not show the liquid crystal phase singly. Such compounds may be blended with other compounds having the general formula (I), other chiral smectic liquid crystal compounds, or other smectic liquid crystal compounds, so that they can be used as the liquid crystal compositions showing ferroelectric characteristics.
In the general formula (I), the naphthalene ring is substitutied by the groups A and B preferably at 1- and 4-positions, 1- and 5-positions or 2- and 6-positions thereof, more preferably at 2- and 6-positions thereof.
The group X in the general formula (I) is preferably a hydrogen atom, a halogen atom, a methyl group or a cyano group.
With regard to the general formula (I), each of Z.sub.1, Z.sub.2, Z.sub.3 and Z.sub.4 in the groups A and B can be selected from the group consisting of a single bond, --C(O)--, --O--, --CH.sub.2 --, --CH.dbd.N--, --N.dbd.CH--, --CH.dbd.CH--, --C.tbd.C--, --N.dbd.N--and --N(O).dbd.N--. However, taking photochemical or chemical stabilities into consideration, the single bond, --C(O)--, --O--or --CH.sub.2 --is preferable, and it is more preferred that each of the --Z.sub.1 --Z.sub.2 -- and --Z.sub.3 --Z.sub.4 --groups is the single bond, --C(O)--O--, --O--C(O)--, --CH.sub.2 O--or --OCH.sub.2 --.
Each of the C and D rings can be optionally selected from the group consisting of 1,4-phenylene, 2,6-naphthylene, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene, trans-1,3-dioxan-2, 5-diyl, trans-1,3-oxathian-2,5-diyl, trans-1,3-dithian-2,5-diyl, 1,3,2-dioxaborinane-2,5-diyl and groups in which hydrogen atom in each of these groups is monosubstituted or multisubstituted by X. However, these groups preferably are 1,4-phenylene, 2,6-naphthylene, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene, 1,3,2-dioxaborinane-2,5-diyl and groups in which they are substituted by X, and more preferably they are 1,4-phenylene, 2,6-naphthylene, trans-1,4-cyclohexylene and groups in which they are substituted by X.
Each of m and n in the groups A and B is an integer of 0, 1 or 2, but preferably they are such balues as to satisfy the relation of m+n.ltoreq.2.
In the compounds represented by the general formula (I), particularly preferable ones can be recited in general formulae as follows: ##STR11##
Concrete examples of this type can be enumerated in general formulae as follows: ##STR12##
Concrete examples of this type can be enumerated in general formula as follows: ##STR13##
Concrete examples of this type can be enumerated in general formula as follows: ##STR14##
Concrete examples of this type can be enumerated in general formula as follows: ##STR15##
Concrete examples of this type can be enumerated in general formula as follows: ##STR16##
Concrete examples of this type can be enumerated in general formula as follows: ##STR17##
In the above-mentioned formulae, R.sub.1 and R.sub.2 are independent and are respectively --R, --OR, --C(O)--OR-- or --O--C(O)--R-- and at least one of them contains an optically active group, in which groups R is a hydrogen atom, a halogen atom, a cyano group or a straight-chain or branched alkyl group, an alkoxyalkyl group, a halogenoalkyl group, a cyanoalkyl group, an alkenylalkyl group or an alkoxycarbonylalkyl group, latter six groups each having 1 to 20 carbon atoms; each of X.sub.1 to X.sub.6 is a hydrogen atom, a halogen atom, a methyl group or a cyano group; and Z is a single bond, --C(O)--O--, --O--C(O)--, --CH.sub.2 O-- or --OCH.sub.2 --.
In the compound having the general formula (I), there exists at least one asymmetric carbon atom, but this atom preferably is present in the group Y of the group A and/or B. The group Y is a hydrogen atom, a halogen atom, a cyano group, a straight-chain or branched alkyl group or an alkenylalkyl group, the latter two groups each having 1 to 20 carbon atoms, and one CH.sub.2 group or two unadjacent CH.sub.2 groups in each of these alkyl groups may be substituted by --O--, --C(O)--, --O--C(O)--or --C(O)--O--, and one hydrogen atom in each of the alkyl groups may be substituted by a halogen atom, a cyano group or an alkoxyl group. Preferably, the group Y is a hydrogen atom, a halogen atom, a cyano group, a straight-chain or branched alkyl group or an alkenylalkyl group, the latter two groups each having 1 to 20 carbon atoms ( one CH.sub.2 group or two unadjacent CH.sub.2 groups in its alkyl portion may be substituted by --O--or --C(O)--O--, and one hydrogen atom in the alkyl portion may be substituted by a halogen atom, a cyano group or an alkoxyl group).
As an asymmetric carbon source, all optically active materials are usable, but in particular, optically active alcohols and optically active carboxylic acids are useful as the starting materials.
Examples of the useful optically active alcohols include optically active 2-methylbutanol, optically active 3-methylpentanol, optically active 4-methylhexanol, optically active 5-methylheptanol, optically active 6-methyloctanol, optically active citronellol, optically active 3,7-dimethyloctanol, optically active 2-butanol, optically active 2-pentanol, optically active 2-hexanol, optically active 2-heptanol, optically active 2-octanol, optically active 2-nonanol, optically active 2-decanol, optically active 2-undecanol, optically active 2-dodecanol, optically active 2-methylpentanol, optically active 2-methylhexanol, optically active 2-alkyloxypropanol, optically active 3-alkyloxybutanol, optically active 3-alkyloxypentanol, optically active lactates, optically active 3-hydroxy-2-methylpropanoates, optically active 3-hydroxybutanoates, optically active 3-hydroxypentanoates, optically active 2-halogenopropanol, optically active 2-halogenobutanol, optically active 2-halogenopentanol, optically active 2-halogenohexanol, optically active 2-halogenoheptanol, optically active 2-halogenooctanol, optically active 2-halogenononanol, optically active 2-halogenodecanol, optically active 2-halogenoundecanol, optically active 2-halogenododecanol and optically active cyanoalkylcarbinol.
Examples of the useful optically active carboxylic acids include optically active 2-methylbutanoic acid, optically active 3-methylpentanoic acid, optically active 4-methylhexanoic acid, optically active 2-methylpentanoic acid, optically active 3,7-dimethyloctanoic acid, optically active 3-methyl-2-halogenopentanoic acid, optically active 4-methyl-2-halogenobutanoic acid, optically active 2-alkyloxypropanoic acid, optically active 3-alkyloxybutanoic acid and optically active 3-alkyloxypentanoic acid.
The liquid crystal composition according to the present invention may be constituted by combining two or more kinds of compounds regarding the present invention which are represented by the general formula (I), but it can also be prepared by joining the compound of the present invention to the following general formula (II).
The compound of the present invention having the general formula (I) and showing the chiral smectic C phase singly is preferably contained in a proportion of 5 wt % or more as a constitutional component in the liquid crystal composition. When this compound is present in the amount of 10 wt % or more in a known liquid crystal compound, a response speed of the known compound can be noticeably accelerated. The constitutional component showing no SC* phase is preferably present therein in a proportion of less than 50 wt %. ##STR18## wherein E and F rings are independent and are ##STR19## in which G is a hydrogen atom, a halogen atom, a cyano group or a methyl group; each of a and b is an integer of 0, 1 or 2; each of X.sub.1, X.sub.2 and X.sub.3 is a single bond, --O--, --C(O)--O--, --O--C(O)--, --CH.sub.2 O--, --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --; and each of R and R' is a hydrogen atom, a halogen atom, a cyano group, an alkyl group, an alkoxyl group, an optically active alkyl group, an optically active alkoxyl group, an optically active alkoxyalkyl group, an optically active alkenylalkyl group or an optically active halogenoalkyl group, the latter seven groups each having 1 to 20 carbon atoms.
The compound of the general formula (I) can be manufactured in accordance with the combination of known unit operations described in a literature (e.g. a standard academic literature such as "Methoden der Organischen Chemie" written by Houben Weil). In addition, known variations of the manufacturing methods which are not referred to in this specification can also be employed.
In the case that --Z.sub.1 --Z.sub.2 -- of A and/or B in the formula (I) is --C(O)--O-- and/or --O--C(O)--, raw materials preferably are combinations of compounds having formulae (III) and (IV) ##STR20## with compounds having formulae (V) to (VIII) ##STR21## wherein X, Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, rings C and D as well as Y are as defined above.
That is, when a compound of the formula (III) is combined with a compound of the formula (VI or (VIII), or when a compound of the formula (IV) is combined with a compound of the formula (V) or (VII), the compound of the general formula I) can be prepared in accordance with an esterification process which is usually used. This process comprises, for example, the steps of first changing the carboxylic compound of the formula (IV), (VI or (VIII) into a reactive derivative such as a corresponding carboxylic acid halide (in particular, chloride or bromide) or carboxylic anhydride and afterward allowing the same to react with the compound of the formula (III), (V) or (VII).
In the case that --Z.sub.1 --Z.sub.2 -- of A and/or B in the formula (I) is --CH.sub.2 O-- and/or --O--CH.sub.2 --, raw materials preferably are combinations of compounds having formulae (III), (V) and (VII) with compounds having the following formulae (IX), (X) and (XI) ##STR22##
In the present invention, the reaction of a usual etherification can be used, and for example, the compound regarding the present invention can be prepared by reacting a hydroxyl compound with a reactive alkyl derivative such as a halide in the presence of a base (sodium hydroxide, potassium hydroxide, sodium hydride, potassium hydride or
Table 2 sets forth typical examples of the compounds regarding the present invention.
As will be definite from examples given hereinafter, the present invention intends to provide optically active naphthalene derivative compounds represented by the general formula (I) and ferroelectric smectic liquid crystal compositions each containing at least one derivative compound mentioned above, whereby the present invention has an effect capable of providing rapidly responsive display elements having photostability and chemical stability.
TABLE 2__________________________________________________________________________ ##STR23##ExampleCompoundNo. R.sup.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________1 CH.sub.3 O H H H H COO COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.52 C.sub.4 H.sub.9 O H H H H " "3 C.sub.6 H.sub.13 O H H H H " "4 C.sub.7 H.sub.15 O H H H H " "5 C.sub.8 H.sub.17 O H H H H " "6 C.sub.9 H.sub.19 O H H H H " "7 C.sub.10 H.sub.21 O H H H H " "8 C.sub.11 H.sub.23 O H H H H " "9 C.sub.12 H.sub.25 O H H H H " "10 C.sub.13 H.sub.27 O H H H H " "11 C.sub.14 H.sub.29 O H H H H " "12 C.sub.15 H.sub.31 O H H H H " "13 C.sub.16 H.sub.33 O H H H H " "14 C.sub.18 H.sub.37 O H H H H " "15 C.sub.20 H.sub.41 O H H H H " "16 C.sub.4 H.sub.9 O F H H H " "17 C.sub.8 H.sub.17 O F H H H " "18 C.sub.9 H.sub.19 O F H H H " "19 C.sub.10 H.sub.21 O F H H H " "20 C.sub.12 H.sub.25 O F H H H " "21 C.sub.16 H.sub.33 O F H H H " "22 C.sub.8 H.sub.17 O Cl H H H " "23 C.sub.10 H.sub.21 O Cl H H H " "24 C.sub.12 H.sub.25 O Cl H H H COO COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.525 C.sub.8 H.sub.17 O H H CN H " "26 C.sub.10 H.sub.21 O Br H H H " ##STR24##27 C.sub.7 H.sub.15 CN H H H "COOC*H(CH.sub.3)C.sub.6 H.sub.1328 C.sub.8 H.sub.17 O H F H H " "29 C.sub.10 H.sub.21 O F H H H " "30 C.sub.12 H.sub.25 O F H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.1331 C.sub.9 H.sub.19 O F H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.532 C.sub.12 H.sub.25 O F H H H " "33 C.sub.9 H.sub.19 OCH.sub.3 H H H " "34 C.sub.10 H.sub.21 O F H H H " COOC*H(CH.sub.3)C.sub.3 H.sub.735 C.sub.12 H.sub.25 O F H H H " "36 C.sub.6 H.sub.13 O F H H H " COO(CH.sub.2).sub.2 C*H(CH.sub .3)C.sub.2 H.sub.537 C.sub.11 H.sub.23 O F H H H " "38 C.sub.10 H.sub.21 O F H H H " COO(CH.sub.2).sub.3 C*H(CH.sub .3)C.sub.2 H.sub.539 C.sub.12 H.sub.25 O F H H H " "40 C.sub.12 H.sub.25 O F H H H " COO(CH.sub.2).sub.4 C*H(CH.sub .3)C.sub.2 H.sub.541 C.sub.12 H.sub.25 O F H H H " COO(CH.sub.2).sub.5 C*H(CH.sub .3)C.sub.2 H.sub.542 C.sub.14 H.sub.29 O F H H H " COO(CH.sub. 2).sub.5 C*H(CH.sub.3)C.sub.2 H.sub.543 C.sub.10 H.sub.21 O H H Cl H " COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.544 C.sub.14 H.sub.29 O H H Cl H " "45 C.sub.16 H.sub.33 O H H Cl H " "46 C.sub.8 H.sub.17 O H H H H " COO(CH.sub.2).sub.2 C*H(CH.sub .3)C.sub.2 H.sub.547 C.sub.10 H.sub.21 O H H H H " "48 C.sub.8 H.sub.17 O H H H H COO COO(CH.sub.2).sub.3 C*H(CH.sub .3)C.sub.2 H.sub.549 C.sub.9 H.sub.19 O H H H H " "50 C.sub.10 H.sub.21 O H H H H " "51 C.sub.11 H.sub.23 O H H H H " COO(CH.sub.2).sub.3 C*H(CH.sub .3 C.sub.2 H.sub.552 C.sub.12 H.sub.25 O H H H H " "53 C.sub.13 H.sub.27 O H H H H " "54 C.sub.14 H.sub.29 O H H H H " "55 C.sub.15 H.sub.31 O H H H H " "56 C.sub.8 H.sub.17 O H H H H " COO(CH.sub.2).sub.4 C*H(CH.sub .3)C.sub.2 H.sub.557 C.sub.9 H.sub.19 O H H H H " COO(CH.sub.2).sub.5 C*H(CH.sub .3)C.sub.2 H.sub.558 C.sub.10 H.sub.21 O H H H H " "59 C.sub.12 H.sub.25 O H H H H " "60 C.sub.10 H.sub.21 O H H H H " COOCH.sub.2 C*H(CH.sub.3)C.sub .3 H.sub.761 C.sub.12 H.sub.25 O H H H H " COOCH.sub.2 C*H(CH.sub.3)C.sub .4 H.sub.962 C.sub.8 H.sub.17 O H H H H " ##STR25##63 C.sub.10 H.sub. 21 O H H H H " "64 C.sub.12 H.sub.25 O H H H H " "65 C.sub.4 H.sub.9 O H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.1366 C.sub.6 H.sub.13 O H H H H " "67 C.sub.8 H.sub.17 O H H H H " "68 C.sub.9 H.sub.19 O H H H H " "69 C.sub.10 H.sub.21 O H H H H " "70 C.sub.11 H.sub.23 O H H H H " "71 C.sub.12 H.sub.25 O H H H H " "72 C.sub.14 H.sub.29 O H H H H COO COOC*H(CH.sub.3)C.sub.6 H.sub.1373 C.sub.16 H.sub.33 O H H H H " "74 C.sub.20 H.sub.41 O H H H H " "75 C.sub.13 H.sub.27 O H H H H " "76 C.sub.4 H.sub.9 O H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.577 C.sub.7 H.sub.15 O H H H H " "78 C.sub.9 H.sub.19 O H H H H " "79 C.sub.10 H.sub.21 O H H H H " "80 C.sub.11 H.sub.23 O H H H H " "81 C.sub.12 H.sub.25 O H H H H " "82 C.sub.14 H.sub.29 O H H H H " "83 C.sub.16 H.sub.33 O H H H H " "84 C.sub.2 H.sub.5 O H H H H " COOC*H(CH.sub.3)C.sub.3 H.sub.785 C.sub.4 H.sub.9 O H H H H " "86 C.sub.8 H.sub.17 O H H H H " "87 C.sub.9 H.sub.19 O H H H H " "88 C.sub.10 H.sub.21 O H H H H " "89 C.sub.11 H.sub.23 O H H H H " "90 C.sub.12 H.sub.25 O H H H H " "91 C.sub.16 H.sub.33 O H H H H " "92 C.sub.10 H.sub.21 O H H H H " COOC*H(CH.sub.3)C.sub.4 H.sub.993 C.sub.12 H.sub.25 O H H H H " COOC*H(CH.sub.3)C.sub.5 H.sub.1194 C.sub.10 H.sub.21 O H H H H " COOC*H(CH.sub.3)C.sub.7 H.sub.1595 C.sub.8 H.sub.17 O H H H H " COOC*H(CH.sub.3)C.sub.8 H.sub.1796 C.sub.9 H.sub.19 O H H H H COO COOC*H(CH.sub.3)C.sub.10 H.sub.2197 C.sub.9 H.sub.19 O H H H H " COOCH.sub.2 C*H(F)C.sub.3 H.sub.798 C.sub.11 H.sub.23 O H H H H " COOCH.sub.2 C*H(F)C.sub.5 H.sub.1199 C.sub.8 H.sub.17 O H H H H " COOCH.sub.2 C*H(F)C.sub.7 H.sub.15100 C.sub.12 H.sub.25 O H H H H " COOCH.sub.2 C*H(F)C.sub.10 H.sub.21101 C.sub.7 H.sub.15 O H H H H " COOCH.sub.2 C*H(OCH.sub.3)CH.s ub.3102 C.sub.10 H.sub.21 O H H H H " COOCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.sub.3103 C.sub.5 H.sub.11 Br H H H " COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5104 C.sub.8 H.sub.17 H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13105 C.sub.4 H.sub.9 O(CH.sub.2).sub.4 O H H H H " "106 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H " COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5107 C.sub.3 H.sub.7 O H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5108 C.sub.6 H.sub.13 O H H H H " "109 C.sub.8 H.sub.17 O H H H H " "110 C.sub.9 H.sub.19 O H H H H " "111 C.sub.10 H.sub.21 O H H H H " "112 C.sub.11 H.sub.23 O H H H H " "113 C.sub.12 H.sub.25 O H H H H " "114 C.sub.13 H.sub.27 O H H H H " "115 C.sub.14 H.sub.29 O H H H H " "116 C.sub.15 H.sub.31 O H H H H " "117 C.sub.16 H.sub.33 O H H H H " "118 C.sub.8 H.sub.17 H H H H " "119 C.sub.8 H.sub.17 O CN H H H " "120 C.sub.10 H.sub.21 O H H C.sub.2 H.sub.5 H COO OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5121 C.sub.12 H.sub.25 O H H OCH.sub.3 H " "122 C.sub.6 H.sub.13 O H H H H " O(CH.sub.2).sub.3 C*H(CH.sub.3 )C.sub.2 H.sub.5123 C.sub.8 H.sub.17 O H H H H " O(CH.sub.2).sub.3 C*H(CH.sub.3 )C.sub.2 H.sub.5124 C.sub.10 H.sub.21 O H H H H " "125 C.sub.12 H.sub.25 O H H H H " "126 C.sub.14 H.sub.29 O H H H H " "127 C.sub.16 H.sub.33 O H H H H " "128 C.sub.8 H.sub.17 H H H H " "129 C.sub.10 H.sub.21 O H H H Cl " O(CH.sub.2).sub.2 C*H(CH.sub.3 )C.sub.2 H.sub.5130 C.sub.12 H.sub.25 O H H H H " "131 C.sub.3 H.sub.7 O H H H H " OC*H(CH.sub.3)C.sub.6 H.sub.13132 C.sub.7 H.sub.15 O H H H H " "133 C.sub.8 H.sub.17 O H H H H " "134 C.sub.9 H.sub.19 O H H H H " "135 C.sub.10 H.sub.21 O H H H H " "136 C.sub.11 H.sub.23 O H H H H " "137 C.sub.12 H.sub.25 O H H H H " "138 C.sub.13 H.sub.27 O H H H H " "139 C.sub.14 H.sub.29 O H H H H " "140 C.sub.9 H.sub.19 O H H H H " OC*H(CH.sub.3)C.sub.2 H.sub.5141 C.sub.10 H.sub.21 O H H H H " "142 C.sub.12 H.sub.25 O H H H H " OC*H(CH.sub.3)C.sub.3 H.sub.7143 C.sub.8 H.sub.17 O H H H H " OCH.sub.2 C*H(OCH.sub.3)CH.sub .3144 C.sub.8 H.sub.17 O H H H H COO OCH.sub.2 C*H(OC.sub.2 H.sub.5)CH.sub.3145 C.sub.12 H.sub.25 O H H H H " "146 C.sub.9 H.sub.19 O H H H H " OCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.sub.3147 C.sub.10 H.sub.21 O H H H H " "148 C.sub.12 H.sub.25 O H H H H " O(CH.sub.2).sub.2 C*H(OC.sub.5 H.sub.11)CH.sub.3149 C.sub.10 H.sub.21 O H H H H " O(CH.sub.2).sub.2 C*H(OC.sub.2 H.sub.5)C.sub.2 H.sub.5150 C.sub.10 H.sub.21 O H H H H " OCH.sub.2 C*H(F)C.sub.5 H.sub.11151 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 O H H H H " OC.sub.10 H.sub.21152 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H " OC.sub.10 H.sub.21153 C.sub.2 H.sub.5 C*H(CH.sub.3)(CH.sub.2).sub.3 O H H H H " OC.sub.10 H.sub.21154 C.sub.8 H.sub.17 O H H H H " OCOC*H(CH.sub.3)C.sub.2 H.sub.5155 C.sub.12 H.sub.25 O H H H H " "156 C.sub.10 H.sub.21 O H H H H " OCOC*H(OCH.sub.3)CH.sub.3157 C.sub.8 H.sub.17 O H H H H " COCH.sub.2 CH.sub.2 C*H(CH.sub .3)C.sub.2 H.sub.5158 H H H H H CH.sub.2 O COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5159 H H H H H " ##STR26##160 C.sub.8 H.sub.17 O H H H H " ##STR27##161 H H H H H " COO(CH.sub.2).sub.2 C*H(CH.sub .3)C.sub.2 H.sub.5162 H H H H H " COO(CH.sub.2).sub.3 C*H(CH.sub .3)C.sub.2 H.sub.5163 C.sub.10 H.sub.21 O H H H H " "164 H H H H H " COO(CH.sub.2).sub.5 C*H(CH.sub .3)C.sub.2 H.sub.5165 H H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5166 C.sub.4 H.sub.9 O H H H H " "167 C.sub.8 H.sub.17 O H H H H " "168 H H H H H CH.sub.2 O COOC*H(CH.sub.3)C.sub.3 H.sub.7169 C.sub.6 H.sub.13 O H H H H " "170 H H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13171 C.sub.10 H.sub.21 O H H H H " "172 C.sub.8 H.sub.17 O H H H H " COOCH.sub.2 C*H(F)C.sub.4 H.sub.9173 C.sub.10 H.sub.21 O H H H H " COOCH.sub.2 C*H(F)C.sub.6 H.sub.13174 C.sub.9 H.sub.19 O H H H H OCH.sub.2 COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5175 C.sub.10 H.sub. 21 O H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13176 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 O H H H H OCO OC.sub.6 H.sub.13177 " H H H H " OC.sub.8 H.sub.17178 " H H H H " OC.sub.10 H.sub.21179 " H H H H " OC.sub.13 H.sub.27180 C.sub.2 H.sub.5 C*H(CH.sub.3)(CH.sub.2).sub.3 O H H H H " OC.sub.6 H.sub.13181 " H H H H " OC.sub.8 H.sub.17182 " H H H H " OC.sub.10 H.sub.21183 " H H H H " OC.sub.12 H.sub.25184 " H H H H " OC.sub.14 H.sub.29185 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H " OC.sub.8 H.sub.17186 C.sub.2 H.sub.5 C*H(CH.sub.3)O H H H H " OC.sub.10 H.sub. 21187 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 H H H H " C.sub.4 H.sub.9188 " H H H H " C.sub.7 H.sub.15189 C.sub.6 H.sub.13 O H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5190 C.sub.8 H.sub.17 O H H H H " "191 C.sub.10 H.sub.21 O H H H H " "192 C.sub.12 H.sub.25 O H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5193 C.sub.6 H.sub.13 O H H H H OCO O(CH.sub.2).sub.3 C*H(CH.sub.3 )C.sub.2 H.sub.5194 C.sub.8 H.sub.17 O H H H H " "195 C.sub.10 H.sub.21 O H H H H " "196 C.sub.12 H.sub.25 O H H H H " "197 C.sub.8 H.sub.17 O H H H H " OC*H(CH.sub.3)C.sub.6 H.sub.13198 F H H H H " "199 CN H H H H " "200 Cl H H H H " "201 CN F H H H " "202 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 OCO H H H H " OC.sub.8 H.sub.17203 " H H H H " OC.sub.10 H.sub.21204 " H H H H " OC.sub.12 H.sub.25205 " H H H H " OC.sub.14 H.sub.29206 C.sub.3 H.sub.7 C*H(CH.sub.3)OCO H H H H " OC.sub.10 H.sub.21207 " H H H H " OC.sub.12 H.sub.25208 C.sub.2 H.sub.5 C*H(CH.sub.3)(CH.sub.2).sub.3 OCO H H H H " OC.sub.4 H.sub.9209 " H H H H " OC.sub.6 H.sub.13210 " H H H H " OC.sub.8 H.sub.17211 " H H H H " OC.sub.10 H.sub.21212 " H H H H " OC.sub.12 H.sub.25213 " H H H H " OC.sub.14 H.sub.29214 " H H H H " OC.sub.16 H.sub.33215 C.sub.2 H.sub.5 C*H(CH.sub.3)OCO H H H H " OC.sub.12 H.sub.25216 " H H H H " O(CH.sub.2).sub.2 OC.sub.4 H.sub.9217 C.sub.4 H.sub.9 C*H(CH.sub.3)OCO H H H H " OC.sub.8 H.sub.17218 C.sub.4 H.sub.9 C*H(CH.sub.3)OCO H H H H OCO OC.sub.9 H.sub.19219 " H H H H " OC.sub.10 H.sub.21220 C.sub.5 H.sub.11 C*H(CH.sub.3)OCO H H H H " OC.sub.7 H.sub.15221 " H H H H " OC.sub.9 H.sub.19222 " H H H H " OC.sub.11 H.sub.23223 CH.sub.3 C*H(OC.sub.2 H.sub.5)CH.sub.2 O H H H H " OC.sub.8 H.sub.17224 CH.sub.3 C*H(OC.sub.4 H.sub.9)CH.sub.2 O H H H H " OC.sub.10 H.sub.21225 C.sub.2 H.sub.5 C*H(F)CH.sub.2 OCO H H H H " OC.sub.7 H.sub.15226 C.sub.4 H.sub.9 C*H(F)CH.sub.2 OCO H H H H " OC.sub.10 H.sub.21227 C.sub.10 H.sub.21 O H H H H CH.sub.2 CH.sub.2 OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5228 C.sub.9 H.sub.19 O H H H H CHN (CH.sub.2).sub.3 C*H(CH.sub.3) C.sub.2 H.sub.5229 C.sub.7 H.sub.15 O F H H H CHCH OC*H(CH.sub.3)C.sub.6 H.sub.13230 C.sub.11 H.sub.23 O H H H H CC CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5__________________________________________________________________________ ##STR28##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 X.sub.5 X.sub.6 Z R.sub.2__________________________________________________________________________231 CH.sub.3 O H H H H H H COO COOCH.sub.2 C*H(CH.sub.3)C. sub.2 H.sub.5232 C.sub.8 H.sub.17 O H H H H H H " "233 C.sub.8 H.sub.17 O H H H H Cl H " "234 C.sub.12 H.sub.25 O H F H H H H " "235 C.sub.7 H.sub.15 O H H H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5236 C.sub.8 H.sub.17 O H H H H H H " "237 C.sub.13 H.sub.27 O Cl H H H H H " "238 C.sub.7 H.sub.15 H H H H H H " "239 C.sub.8 H.sub.17 H H H H H H " "240 C.sub.12 H.sub.25 H H H H H H " "241 C.sub.7 H.sub.15 O H H H H H H " COOC*H(CH.sub.3)C.sub.3 H.sub.7242 C.sub.10 H.sub.21 O H H H H H H " COOC*H(CH.sub.3)C.sub.4 H.sub.9243 C.sub.4 H.sub.9 O H H H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13244 C.sub.7 H.sub.15 O H H H H H H " "245 C.sub.8 H.sub.17 O H H H H H H " "246 C.sub.10 H.sub.21 O H H H H H H " "247 C.sub.12 H.sub.25 O H H H H H H " "248 C.sub.7 H.sub.15 H H H H H H " "249 C.sub.8 H.sub.17 H H H H H H " "250 C.sub.10 H.sub.21 H H H H H H " "251 C.sub.7 H.sub.15 O Cl H H H H H " "252 C.sub.9 H.sub.19 O Cl H H H H H " "253 C.sub.10 H.sub.21 O F H H H H H " "254 C.sub.12 H.sub.25 O F H H H H H COO COOC*H(CH.sub.3)C.sub.6 H.sub.13255 C.sub.12 H.sub.25 O H H H F H H " "256 C.sub.8 H.sub.17 O H H H H H H " COOC*H(CH.sub.3)C.sub.8 H.sub.17257 C.sub.7 H.sub.15 H H H H H H " "258 C.sub.12 H.sub.25 O H H H H H H " COOC*H(CH.sub.3)C.sub.10 H.sub.21259 C.sub.10 H.sub.21 O H H H H H H " COO(CH.sub.2).sub.3 C*H(CH.sub.3)C.sub.2 H.sub.5260 C.sub.7 H.sub.15 O H H H H H H " COOCH.sub.2 C*H(OCH.sub.3)C H.sub.3261 C.sub.9 H.sub.19 O H H H H H H " COOCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.sub.3262 C.sub.9 H.sub.19 O H H H H H H " COO(CH.sub.2).sub.2 C*H(OC.sub.4 H.sub.9)C.sub. 2 H.sub.5263 C.sub.8 H.sub.17 O H H H H H H " COOCH.sub.2 C*H(F)CH.sub.3264 C.sub.10 H.sub.21 O H H H H H H " COOCH.sub.2 C*H(F)C.sub.6 H.sub.13265 C.sub.12 H.sub.25 O H H H H H H " COOCH.sub.2 C*H(F)C.sub.9 H.sub.19266 C.sub.4 H.sub.9 O H H H H H H " OCH.sub.2 C*H(CH.sub.3)C.su b.2 H.sub.5267 C.sub.8 H.sub.17 O H H H H H H " "268 C.sub.12 H.sub.25 O H H H H H H " "269 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 O H H H H H H " OC.sub.10 H.sub.21270 C.sub.10 H.sub.21 O H H H H H H " OC*H(CH.sub.3)C.sub.2 H.sub.5271 C.sub.5 H.sub.11 O H H H H H H " OC*H(CH.sub.3)C.sub.6 H.sub.13272 C.sub.7 H.sub.15 O H H H H H H " "273 C.sub.8 H.sub.17 O H H H H H H " "274 C.sub.12 H.sub.25 O H H H H H H " "275 C.sub.9 H.sub.19 O H H H H H H " OC*H(CH.sub.3)C.sub.3 H.sub.7276 C.sub.6 H.sub.13 O H H H H H H " ##STR29##277 C.sub.10 H.sub.21 O H H H H H H " "278 C.sub.8 H.sub.17 O H H H H H H COO O(CH.sub.2).sub.5 C*H(CH.su b.3)C.sub.2 H.sub.5279 C.sub.12 H.sub.25 O H H H H H H " OCH.sub.2 C*H(CH.sub.3)C.su b.4 H.sub.9280 C.sub.7 H.sub.15 O H H H H H H " OCH.sub.2 C*H(OC.sub.2 H.sub.5)CH.sub.3281 C.sub.10 H.sub.21 O H H H H H H " O(CH.sub.2).sub.2 C*H(OC.su b.3 H.sub.7)C.sub.2 H.sub.5282 C.sub.12 H.sub.25 O H H H H H H " OCH.sub.2 C*H(F)C.sub.6 H.sub.13283 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H H H " C.sub.4 H.sub.9284 " H H H H H H " C.sub.6 H.sub.13285 " H H H H H H " C.sub.7 H.sub.15286 " H H H H H H " OC.sub.6 H.sub.13287 C.sub.18 H.sub.17 O H H H H H H " OCOC*H(CH.sub.3)C.sub.3 H.sub.7288 C.sub.8 H.sub.17 H H H H H H " "289 C.sub.10 H.sub.21 O H H H H H H " OCOCH.sub.2 C*H(CH.sub.3)C. sub.2 H.sub.5290 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 OCO H H H H H H OCO OC.sub.6 H.sub.13291 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 OCO H H H H H H " OC.sub.8 H.sub.17292 C.sub.6 H.sub.13 C*H(CH.sub.3)OCO H H H H H Cl " OC.sub.10 H.sub.21293 C.sub.6 H.sub.13 C*H(CH.sub.3)OCO H H H H H H " C.sub.8 H.sub.17294 C.sub.2 H.sub.5 C*H(CH.sub.3)OCO H H F H H H " OC.sub.8 H.sub.17295 " H H H F H H " OC.sub.10 H.sub.21296 C.sub. 7 H.sub.15 O H H H H H H CH.sub.2 O COOC*H(CH.sub.3)C.sub.6 H.sub.13297 C.sub.8 H.sub.17 O H H H H H H OCH.sub.2 "298 C.sub.8 H.sub.17 O H H H H H H CH.sub.2 O COOC*H(CH.sub.3)C.sub.2 H.sub.5299 C.sub.10 H.sub.21 O H H H H H H OCH.sub.2 "300 C.sub.8 H.sub.17 H H H H H H CH.sub.2 O COOCH.sub.2 C*H(CH.sub.3)C. sub.2 H.sub.5301 C.sub.10 H.sub.21 H H H H H H OCH.sub.2 "__________________________________________________________________________ ##STR30##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub. 2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________302 C.sub.3 H.sub.7 O H H H H COO COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5303 C.sub.6 H.sub.13 O H H H H " "304 C.sub.8 H.sub.17 O H H H H " "305 C.sub.10 H.sub.21 O H H H H " "306 C.sub.12 H.sub.25 O H H H H " "307 C.sub.14 H.sub.29 O H H H H " "308 C.sub.16 H.sub.33 O H H H H " "309 C.sub.9 H.sub.19 O H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5310 C.sub.11 H.sub.23 O H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13311 C.sub.10 H.sub.21 O Cl H H H " COOC*H(CH.sub.3)C.sub.3 H.sub.7312 C.sub.8 H.sub.17 H H H Cl " "313 C.sub.9 H.sub.19 H H H H " COOCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.sub.3314 C.sub.11 H.sub.23 O H H H H " COOCH.sub.2 C*H(F)C.sub.6 H.sub.13315 C.sub.8 H.sub.17 O H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5316 C.sub.10 H.sub.21 O H H H H " OC*H(CH.sub.3)C.sub.2 H.sub.5317 C.sub.10 H.sub.21 H H H H " OC*H(CH.sub.3)C.sub.6 H.sub.13318 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 O H H H H " OC.sub.10 H.sub.21319 C.sub.2 H.sub.5 C*H(CH.sub.3)(CH.sub.2).sub.3 O H H H H " "320 C.sub.8 H.sub.17 O H H H H " OCH.sub.2 C*H(OC.sub.2 H.sub.5)CH.sub.3321 C.sub.10 H.sub.21 O H H H H " OCH.sub.2 C*H(OC.sub.5 H.sub.11)CH.sub.3322 C.sub.7 H.sub.15 O H H H H " OCH.sub.2 C*H(F)C.sub.5 H.sub.11323 C.sub.9 H.sub.19 O H H H H " OCH.sub.2 C*H(F)C.sub.7 H.sub.15324 C.sub.6 H.sub.13 O H H H H " CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5325 C.sub.8 H.sub.17 H H H H COO CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5326 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H " C.sub.6 H.sub.13327 " H H H H " C.sub.8 H.sub.17328 " H H H H " CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5329 C.sub.6 H.sub.13 O H H H H " OCOC*H(CH.sub.3)C.sub.2 H.sub.5330 C.sub.7 H.sub.15 H H H H " "331 C.sub.10 H.sub.21 O H H H H " OCO(CH.sub.2).sub.2 C*H(CH.sub .3)C.sub.2 H.sub.5332 C.sub.8 H.sub.17 H H H H CH.sub.2 O COOCH.sub.2 C*H(CH.sub.3 )C.sub.2 H.sub.5333 C.sub.10 H.sub.21 O H H H H " "334 C.sub.12 H.sub.25 O H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5335 C.sub.10 H.sub.21 O H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13336 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H H H " COOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5__________________________________________________________________________ ##STR31##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 Z R.sub.2__________________________________________________________________________337 CH.sub.3 H H COO COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5338 C.sub.5 H.sub.11 H H " "339 C.sub.10 H.sub.21 H H " "340 C.sub.4 H.sub.9 H H " COOC*H(CH.sub. 3)C.sub.6 H.sub.13341 C.sub.9 H.sub.19 H H " "342 C.sub.7 H.sub.15 H H " COO(CH.sub.2).sub.3 C*H(CH.sub.3)C .sub.2 H.sub.5343 C.sub.8 H.sub.17 H H " "344 C.sub.5 H.sub.11 H H " ##STR32##345 C.sub.5 H.sub.11 H H " COOC*H(CH.sub.3)C.sub.3 H.sub.7346 C.sub.5 H.sub.11 Cl H " COOC*H(CH.sub.3)C.sub.2 H.sub.5347 C.sub.5 H.sub.11 H H " COOCH.sub.2 C*H(F)C.sub.6 H.sub.13348 C.sub.5 H.sub.11 H H " COOCH.sub.2 C*H(OC.sub.2 H.sub.5)C H.sub.3349 C.sub.5 H.sub.11 H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5350 C.sub.7 H.sub.15 H Cl " "351 C.sub.3 H.sub.7 H H " OC*H(CH.sub.3)C.sub.6 H.sub. 13352 C.sub.9 H.sub.19 H H " "353 C.sub.5 H.sub.11 H H " OC*H(CH.sub.3)C.sub.2 H.sub.5354 C.sub.10 H.sub.21 H H " OC*H(CH.sub.3)C.sub.4 H.sub.9355 C.sub.5 H.sub.11 H H " COOCH.sub.2 C*H(OCH.sub.3)CH.sub.3356 C.sub.8 H.sub.17 H H " COOCH.sub.2 C*H(OC.sub.4 H.sub.9)C H.sub.3357 C.sub.4 H.sub.9 H H " COOCH.sub.2 C*H(F)C.sub.4 H.sub.9358 C.sub.9 H.sub.19 H H " COOCH.sub.2 C*H(F)C.sub.8 H.sub.17359 C.sub.5 H.sub.11 H H " OCOC*H(CH.sub.3)C.sub.2 H.sub.5360 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 H H COO C.sub.6 H.sub.13361 " H H " OC.sub.5 H.sub.11362 " H H " OC*H(CH.sub.3)C.sub.6 H.sub.13363 C.sub.5 H.sub.11 H H single bond CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5364 C.sub.8 H.sub.17 H H " OC*H(CH.sub.3)C.sub.6 H.sub.13365 CH.sub.3 H H OCO CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5366 C.sub.7 H.sub.15 H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5367 C.sub.8 H.sub.17 H H OCO OC*H(CH.sub.3)C.sub.6 H.sub.13368 C.sub.5 H.sub.11 H H " COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5369 C.sub.7 H.sub.15 H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13370 C.sub.5 H.sub.7 H H CH.sub.2 O "371 C.sub.7 H.sub.15 H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5372 C.sub.8 H.sub.17 H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5373 C.sub.10 H.sub.21 H H " CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5374 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 H H " C.sub.6 H.sub.13375 " H H " OC.sub.8 H.sub.17376 C.sub.4 H.sub.9 H H OCH.sub.2 OC*H(CH.sub.3)C.sub.2 H.sub.5377 C.sub.8 H.sub.17 H H " OC*H(CH.sub.3)C.sub.6 H.sub.13__________________________________________________________________________ ##STR33##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 X.sub.5 X.sub.6 Z R.sub.2__________________________________________________________________________378 C.sub.4 H.sub.9 O H H Cl H H H COO OCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5379 C.sub.8 H.sub.17 O H H Cl H H H " "380 C.sub.10 H.sub.21 O H H Cl H H H " "381 C.sub.12 H.sub.25 O H H Cl H H H " "382 C.sub.13 H.sub.27 O H H H H H H " "383 C.sub.7 H.sub.15 O H H F H H H " "384 C.sub.9 H.sub.19 O H H H H H Cl " "385 C.sub.10 H.sub.21 O H H H H F H " "386 C.sub.8 H.sub.17 O Cl H H H H H " "387 C.sub.14 H.sub.29 O H H Cl H H H " "388 C.sub.16 H.sub.33 O H H Cl H H H " "389 C.sub.8 H.sub.17 O H H H H H H " COOCH.sub.2 C*H(CH.sub.3)C.s ub.2 H.sub.5390 C.sub.8 H.sub.17 H H H H H H " "391 C.sub.10 H.sub.21 O H H H H H Cl " "392 C.sub.10 H.sub.21 O H H H H H F " "393 C.sub.12 H.sub.25 O H H H F H H " "394 C.sub.10 H.sub.21 O H H H H H H " COOC*H(CH.sub.3)C.sub.2 H.sub.5395 C.sub.13 H.sub.27 O H H H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13396 C.sub.10 H.sub.21 H H Cl H H H " CH.sub.2 C*H(CH.sub.3)C.sub. 2 H.sub.5397 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 OCO H H Cl H H H OCO OC.sub.8 H.sub.17398 " H H H F H H " C.sub.10 H.sub.21399 C.sub.6 H.sub.13 C*H(CH.sub.3)OCO H Cl H H H H " OC.sub.10 H.sub.21400 C.sub.6 H.sub.13 O H H H H H H " OC*H(CH.sub.3)C.sub.6 H.sub.13401 C.sub.10 H.sub.21 O H H H H H H " "__________________________________________________________________________ ##STR34##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 R.sub.2__________________________________________________________________________402 C.sub.3 H.sub.7 O H H COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5403 C.sub.6 H.sub.13 O H H "404 C.sub.8 H.sub.17 O H H "405 C.sub.9 H.sub.19 O H H "406 C.sub.10 H.sub.21 O H H "407 C.sub.11 H.sub.23 O H H "408 C.sub.12 H.sub.25 O H H "409 C.sub.14 H.sub.29 O H H "410 C.sub.16 H.sub.33 O H H "411 C.sub.18 H.sub.37 O H H "412 C.sub.8 H.sub.17 H H "413 C.sub.6 H.sub.13 O H H COOC*H(CH.sub.3)C.sub.2 H.sub.5414 C.sub.8 H.sub. 17 O H H "415 C.sub.9 H.sub.19 O Cl H "416 C.sub.10 H.sub.21 O H H "417 C.sub.11 H.sub.23 O H H "418 C.sub.12 H.sub.25 O H H "419 C.sub.14 H.sub.29 O H H "420 C.sub.16 H.sub.33 O H H "421 C.sub.18 H.sub.37 O H H "422 C.sub.6 H.sub.13 H H "423 C.sub.8 H.sub.17 H H "424 C.sub.6 H.sub.13 O H H COOC*H(CH.sub.3)C.sub.3 H.sub.7425 C.sub.8 H.sub.17 O H H "426 C.sub.10 H.sub.21 O H H "427 C.sub.14 H.sub.29 O H H "428 C.sub.16 H.sub.33 O H H "429 C.sub.18 H.sub.37 O H H "430 C.sub.8 H.sub.17 H H "431 C.sub.10 H.sub.21 H H "432 C.sub.6 H.sub.13 O H H COOC*H(CH.sub.3)C.sub.4 H.sub.9433 C.sub.8 H.sub.17 O H H "434 C.sub.10 H.sub.21 O H H "435 C.sub.12 H.sub.25 O H H "436 C.sub.16 H.sub.33 O H H "437 C.sub.8 H.sub.17 H H "438 C.sub.10 H.sub.21 H H "439 C.sub.8 H.sub.17 O H H COOC*H(CH.sub.3)C.sub.6 H.sub.13440 C.sub.7 H.sub.15 O H H COO(CH.sub.2).sub.2 C*H(CH.sub.3)C.su b.2 H.sub.5441 C.sub.10 H.sub.21 O H H ##STR35##442 C.sub.10 H.sub.21 O H H COOC*H(CH.sub.3)C.sub.9 H.sub.19443 C.sub.6 H.sub.13 O H H COOCH.sub.2 C*H(OCH.sub.3)CH.sub.3444 C.sub.10 H.sub.21 H H COOCH.sub.2 C*H(OC.sub.2 H.sub.5)CH.s ub.3445 C.sub.8 H.sub.17 O H H COOCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.s ub.3446 C.sub.8 H.sub.17 O H H COO(CH.sub.2).sub.2 C*H(OC.sub.2 H.sub.5)CH.sub.3447 C.sub.8 H.sub.17 O H H COOC*H(CN)C.sub.2 H.sub.5448 C.sub.8 H.sub.17 O H H COOCH.sub.2 C*H(CH.sub.3)CO.sub.2 CH.sub.3449 C.sub.11 H.sub.23 O H H COOCH.sub.2 C*H(CH.sub.3)CO.sub.2 C.sub.2 H.sub.5450 C.sub.10 H.sub.21 O H H COOC*H(CH.sub.3)CH.sub.2 CO.sub.2 C.sub.2 H.sub.5451 C.sub.10 H.sub.21 O H H COOC*H(CH.sub.3)CH.sub.2 CO.sub.2 C.sub.4 H.sub.9452 C.sub.8 H.sub.17 O H H OCOC*H(CH.sub.3)C.sub.2 H.sub.5453 C.sub.10 H.sub.21 O H H "454 C.sub.8 H.sub.17 O H Cl "455 C.sub.8 H.sub.17 O H H OCOC*H(CH.sub.3)C.sub.3 H.sub.7456 C.sub.8 H.sub.17 O H H OCO(CH.sub.2).sub.2 C*H(CH.sub.3)C.su b.2 H.sub.5457 C.sub.10 H.sub. 21 O H H "458 C.sub.12 H.sub.25 O H H "459 C.sub.14 H.sub.29 O H H "460 C.sub.10 H.sub.21 O H H ##STR36##461 C.sub.8 H.sub.17 O H H OCOC*H(Cl)C*H(CH.sub.3)C.sub.2 H.sub.5462 C.sub.10 H.sub.21 O H H "463 C.sub.10 H.sub.21 O H H OCOC*H(Br)C*H(CH.sub.3)C.sub.2 H.sub.5464 C.sub.12 H.sub.25 O H H "465 C.sub.10 H.sub.21 O H H OCOC*H(Br)CH(CH.sub.3)CH.sub.3466 C.sub.2 H.sub.5 C*H(CH.sub.3)CH.sub.2 OCO H H COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5467 C.sub.6 H.sub.13 C*H(CH.sub.3)OCO H H COOC*H(CH.sub.3)C.sub.6 H.sub.13468 C.sub.2 H.sub.5 C*H(CH.sub.3)OCO H H "469 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H OC*H(CH.sub.3)C.sub.6 H.sub.13470 C.sub. 6 H.sub.13 C*H(CH.sub.3)O H H CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5471 C.sub.2 H.sub.5 C*H(CH.sub.3)O H H CN472 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H Br473 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H COOC.sub.4 H.sub.9474 C.sub.6 H.sub.13 C*H(CH.sub.3)O H H COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5__________________________________________________________________________ ##STR37##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 R.sub.2__________________________________________________________________________475 C.sub.8 H.sub.17 O H H OCH.sub.2 C*H(CH.sub.3)C.sub.4 H.sub.9476 C.sub.10 H.sub.21 O H H OCH.sub.2 C*H(OCH.sub.3)CH.sub.3477 C.sub.12 H.sub.25 O H H OCH.sub.2 C*H(OC.sub.3 H.sub.7)CH.sub .3478 C.sub.9 H.sub. 19 H H (CH.sub.2).sub.3 C*H(CH.sub.3)C.sub.2 H.sub.5479 C.sub.11 H.sub.23 H H OCOC*H(CH.sub.3)C.sub.2 H.sub.5480 C.sub.2 H.sub.5 C*H(CH.sub.3)(CH.sub.2).sub.5 H H OC.sub.8 H.sub.17481 C.sub.9 H.sub.19 H H COOC*H(CH.sub.3)C.sub.6 H.sub.13__________________________________________________________________________ ##STR38##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________482 C.sub.8 H.sub.17 H H H H COO COOC*H(CH.sub.3)C.sub.6 H.sub.13483 C.sub.9 H.sub.19 H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5484 C.sub.11 H.sub.23 H H Cl H " OC*H(CH.sub.3)C.sub.3 H.sub.7485 C.sub.12 H.sub.25 H H H H " OCH.sub.2 C*H(OC.sub.2 H.sub.5)CH.sub.3486 C.sub.9 H.sub.19 H H H H NCH OC*H(CH.sub.3)C.sub.2 H.sub.5487 C.sub.14 H.sub.29 H H H H NN (CH.sub.2).sub.2 C*H(CH.sub.3) C.sub.2 H.sub.5__________________________________________________________________________ ##STR39##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________488 C.sub.5 H.sub.11 H H H H COO COOC*H(CH.sub.3)C.sub.5 H.sub.11489 C.sub.10 H.sub.21 H H H H " COO(CH.sub.2).sub.4 C*H(CH.sub .3)C.sub.2 H.sub.5490 C.sub.8 H.sub.17 H H H H " OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5491 C.sub.11 H.sub.23 H H H H " OCOCH.sub.2 C*H(CH.sub.3)C.sub .2 H.sub.5492 C.sub.7 H.sub.15 H H H H CHN (CH.sub.2).sub.2 C*H(CH.sub.3) C.sub.2 H.sub.5__________________________________________________________________________ ##STR40##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________493 C.sub.3 H.sub.7 H H H H COO COO(CH.sub.2).sub.3 C*H(CH.sub .3)C.sub.2 H.sub. 5494 C.sub.10 H.sub.21 H H Cl H " COOC*H(CH.sub.3)C.sub.6 H.sub.13495 C.sub.5 H.sub.11 H H H H NN OCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5496 C.sub.7 H.sub.15 H H H H N(O)N OC*H(CH.sub.3)C.sub.7__________________________________________________________________________ H.sub.15 ##STR41##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________497 C.sub.7 H.sub.15 H H H H COO COOCH.sub.2 C*H(CH.sub.3)C.sub. 2 H.sub.5498 C.sub.10 H.sub.21 H H Cl H " COO(CH.sub.2).sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5499 C.sub.12 H.sub.25 H H H H " COOC*H(CH.sub.3)C.sub.6 H.sub.13500 C.sub.8 H.sub.17 H H H H " OC*H(CH.sub.3)C.sub.2 H.sub.5501 C.sub.10 H.sub.21 H H H H " OCOCH.sub.2 C*H(CH.sub.3)C.sub. 2 H.sub.5502 C.sub.11 H.sub.23 H F H H " CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5__________________________________________________________________________ ##STR42##ExampleCompoundNo. R.sub.1 X.sub.1 X.sub.2 X.sub.3 X.sub.4 Z R.sub.2__________________________________________________________________________503 C.sub.4 H.sub.9 H H H F COO COOCH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5504 C.sub.7 H.sub.15 H H Cl H " COOC*H(CH.sub.3)C.sub.6 H.sub.13505 C.sub.10 H.sub.21 H H H H " "506 C.sub.8 H.sub.17 H H H H " O(CH.sub.2).sub.4 C*H(CH.sub. 3)C.sub.2 H.sub.5507 C.sub.11 H.sub.23 H H H H " OCH.sub.2 C*H(OC.sub.4 H.sub.9)CH.sub.3508 C.sub.14 H.sub.29 H H H C.sub.2 H.sub.5 " CH.sub.2 C*H(CH.sub.3)C.sub.2 H.sub.5__________________________________________________________________________

EXAMPLES
Now, the present invention will be described in detail in accordance with examples, but needless to say, the purport and the applied scope of the present invention should not be limited to these examples.
In tables given below, the symbol C represents a crystal phase, SC* represents a chiral smectic C phase, SA represents a smectic A phase, Ch represents a cholesteric (chiral nematic) phase, I represents an isotropic liquid, and SX represents an unknown smectic phase. Further, the symbol "." of each phase and a numeral on its right side indicate a phase transition temperature from this phase to a phase on its right side, and the symbol "-" means that the compound does not show its phase. Furthermore, a value in each pair of round parentheses represents a monotropic phase transition temperature, and the symbol "*" represents an asymmetric carbon atom.
EXAMPLE 1
Preparation of (R)--6-benzyloxynaphthalene-2-carboxylic acid 1'-methylheptyl ester
In 500 ml of benzene, 65 g of 6-benzyloxynaphthalene-2-carboxylic acid was heated at reflux together with 50 g of oxalyl chloride for a period of 4 hours, and afterward the excessive oxalyl chloride and benzene were distilled out under reduced pressure in order to obtain an acid chloride. This acid chloride was then dissolved in 100 ml of benzene, and to the resulting solution was added a solution in which 30 g of (R)--2-octanol was dissolved in 30 ml of pyridine. Then, the mixed solution was allowed to stand at room temperature for 8 hours. A precipitated pyridine hydrochloride was filtered out, and an organic layer was then washed with a 2N hydrochloric acid solution and a 2N aqueous sodium hydroxide solution. Further, water washing was then carried out until the solution had become neutral. The organic layer was separated and then dried with anhydrous magnesium sulfate, and the used benzene was distilled out under reduced pressure. The resulting residue was recrystallized out of ethanol in order to prepare 80 g of the desired (R)--6-benzyloxynaphthalene-2-carboxylic acid 1'-methylheptyl ester.
A phase transition temperature of this compound is set forth in Table 3.
Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.26 H.sub.30 O.sub.3) Analytical Value______________________________________C 79.96% 79.89%H 7.74% 7.70%______________________________________
EXAMPLE 2 TO 8
The same procedure as in Example 1 was repeated with the exception that (R)-2-octanol was replaced with various optically active alcohols, in order to prepare various optically active 6-benzyloxynaphthalene-2-carboxylic acid alkyl esters. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLE 9
Preparation of (R)-6-(4'-decyloxyphenylcarbonyloxy)-2-naphthalenecarboxylic acid 1"-methylheptyl ester
(i) First, 30 g of (R)--6-benzyloxynaphthalene-2-carboxylic acid 1'-methylheptyl ester prepared in Example 1 was dissolved in 200 ml of ethanol, and hydrogenation was then carried out at 40.degree. C. under atmospheric pressure in the presence of 4 g of a 5% palladium/carbon composite. The latter was then filtered out, and the used solvent was distilled out under reduced pressure in order to prepare 23 g of a benzyl group-free product having a melting point of 67.degree. to 68.degree. C.
(ii) Next, 4.0 g of (R)--6-hydroxynaphthalene-2-carboxylic acid 1 -methylheptyl ester which was the product of the preceding paragraph (i), 3.7 g of 4-decyloxybenzoic acid, 2.6 g of N,N'-dicyclohexylcarbodiimide and 10 mg of 4-pyrrolidinopyridine were dissolved in 50 ml of chloroform, and the resulting mixture was then allowed to stand at room temperature for 8 hours. A secondarily produced N,N'-dicyclohexyl urea was filtered out, and an organic layer was then washed with a 2N hydrochloric acid solution and a 2N aqueous sodium hydroxide solution, followed by water washing. The organic layer was then dried with anhydrous magnesium sulfate, and the used solvent was distilled out to prepare a crude product. The latter was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. Further, recrystallization was accomplished out of ethanol to prepare 5.0 g of the desired (R)--6-(4'-decyloxyphenylcarbonyloxy-2-naphthalenecarboxylic acid 1"-methylheptyl ester in the state of a colorless needle crystal. The yield was 67%. A phase transition temperature of the thus prepared compound is set forth in Table 3. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.36 H.sub.48 O.sub.5) Analytical Value______________________________________C 77.11% 77.25%H 8.63% 8.59%______________________________________
When measured at a 10.degree. C lower temperature than an SC*-SA phase transition temperature, a value of a spontaneous polarization (Ps) was 87 nC/cm.sup.2.
EXAMPLES 10 TO 19
The same procedure as in the process (ii) in Example 9 was repeated with the exception that 4-decyloxybenzoic acid was replaced with various 4-alkyloxybenzoic acids, 4-alkylbenzoic acids or 4-alkyloxy-3-halogenobenzoic acids, in order to thereby prepare various ester compounds. Their phase transition temperatures which are physical values are all set forth in Table 3.
EXAMPLES 20 TO .dwnarw.
Various ester compounds were prepared in a manner similar to that of Example 9 (ii) from various optically active 6-hydroxynaphthalene-2-carboxylic acid alkyl esters or various optically active 6-hydroxy-5-halogenonaphthalene2-carboxylic acid alkyl esters prepared in a manner similar to that of Example 9 (i) and various 4-alkoxybenzoic acids, 4-alkoxy-3-halogenobenzoic acids or optically active 4-alkoxybenzoic acids. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLE 76
Preparation of (s)--6-(2'-methylbutyloxy)--2-naphthyl-4"-decyloxybenzoic acid ester
To 50 ml of methylene chloride were added 1.0 g of 4-decyloxybenzoic acid, 750 mg of (s)--6-(2 -methylbutyloxy)-2-naphthol, 700 mg of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 4 hours. Secondarily produced N,N'-dicyclohexyl urea was filtered out, and an organic layer was then washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate. Methylene chloride was then distilled out, and the resulting residue was purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized twice out of ethanol to prepare 750 mg of the desired (s)-6-(2'-methylbutyloxy)-2-naphthyl-4"-decyloxybenzoic acid ester in the state of a colorless needle crystal. The yield was 47%. A phase transition temperature of the thus prepared compound is set forth in Table 3. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.32 H.sub.42 O.sub.4) Analytical Value______________________________________C 78.33% 78.41%H 8.63% 8.72%______________________________________
When measured at a 10.degree. C. lower temperature than an SC*-SA transition temperature, a value of a spontaneous polarization (Ps) was 2 nC/cm.sup.2.
EXAMPLES 77 TO 86
The same procedure as in Example 76 was repeated with the exception that 4-decyloxybenzoic acid was replaced with various 4-alkoxybenzoic acids or 4-alkylbenzoic acids in order to prepare optically active various ester compounds. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLES 87 TO 110
Following the same procedure as in Example 76, various optically active 6-alkyloxy-2-naphthol or optically active 6-alkoxyalkyloxy-2-naphthols were reacted with 4-alkoxybenzoic acids, and various 6-alkoxy-2-naphthols were reacted with optically active 4-alkoxybenzoic acids, in order to prepare various optically active esters. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLE 111
Preparation of (s)--4'-(2"-methylbutyloxy)phenyl-6-octyloxynaphthalene-2-carboxylic acid ester
In 50 ml of methylene chloride were dissolved 1.8 g of 6-octyloxynaphthalene-2-carboxylic acid, 1.1 g of (s)-4-(2'-methylbutyloxy)phenol, 1.2 g of N,N'-dicyclohexylcarbodiimide and 50 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 15 hours. Secondarily produced N,N'-dicyclohexyl urea was filtered out, and an organic layer was then washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate. Methylene chloride was distilled out, and the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized twice out of ethanol to prepare the desired (s)-4'-2"-methylbutyloxy)phenyl-6-octyloxynaphthalene-2-carboxylic acid ester in the state of a colorless needle crystal. The yield was 59%.
A phase transition temperature of the thus prepared compound is set forth in Table 3. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.30 H.sub.38 O.sub.4) Analytical Value______________________________________C 77.89% 77.95%H 8.28% 8.20%______________________________________
EXAMPLES 112 AND 113
The same procedure as in Example 111 was repeated with the exception that 4-octyloxybenzoic acid was replaced with various 4-alkoxybenzoic acids in order to prepare ester compounds. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLES 114 TO 131
Following the same procedure as in Example 111, optically active 4-alkoxyphenols or optically active 4-alkylphenols were reacted with various 6-alkoxynaphthalene-2-carboxylic acid, or various 4-alkoxyphenols were reacted with various optically active 6-alkoxynaphthalene-2-carboxylic acids or 4-halogenophenols, or 4-cyanophenol or 3-halogeno-4-cyanophenols were reacted with optically active 6-alkoxynaphthalene-2-carboxylic acids, in order to prepare various esters. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLES 132
Preparation of (s)-4-(6'-octyloxy-2'-naphthoyloxy)-benzoic acid 2"-methylbutyl ester
In 30 ml of methylene chloride were dissolved 700 mg of (s)-4-hydroxybenzoic acid 2'-methylbutyl ester, 1.0 g of 6-octyloxynaphthalene-2-carboxylic acid, 700 mg of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 10 hours. Secondarily produced N,N'-dicyclohexyl urea was filtered out, and an organic layer was then washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate. Methylene chloride was distilled out, and the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized out of ethanol to prepare 1.1 g of the desired (s)-4-(6'-octyloxy-2'-naphthoyloxy)benzoic acid 2"-methylbutyl ester in the state of a colorless needle crystal. The yield was 67%.
A phase transition temperature of the thus prepared compound is set forth in Table 3. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical value (as C.sub.31 H.sub.38 O.sub.5) Analytical Value______________________________________C 75.89% 75.75%H 7.81% 7.79%______________________________________
EXAMPLES 133 TO 135
The same procedure as in Example 132 was repeated with the exception that 6-octyloxynaphthalene-2-carboxylic acid was replaced with various 6-alkyloxynaphthalene-2-carboxylic acids in order to prepare various ester compounds. Their phase transition temperatures which are physical values are set forth in Table 3.
EXAMPLES 136 TO 151
Following the same procedure as in Example 132, various optically active 4-hydroxybenzoic acid alkyl esters were reacted with various 6-alkoxynaphthalene-2-carboxylic acids or 6-alkoxyalkyloxynaphthalene-2-carboxylic acids in order to prepare various ester compound. Their phase transition temperatures which are physical values are set forth in Table 3.
TABLE 3__________________________________________________________________________ Num-pleExam- ##STR43##ber Wherein A represents Wherein B represents X Phase transition temperature (.degree.C.)__________________________________________________________________________ C SC* SA Ch I 1 ##STR44## ##STR45## H .cndot. 69.5 -- -- -- .cndot. 2 " ##STR46## H .cndot. 87.0 -- -- -- .cndot. 3 " ##STR47## H .cndot. 60.5 -- -- -- .cndot. 4 " ##STR48## H .cndot. 78.5 -- -- -- .cndot. 5 " ##STR49## H .cndot. 65.0 -- -- -- .cndot. 6 " ##STR50## H .cndot. 51.5 -- -- -- .cndot. 7 ##STR51## ##STR52## H .cndot. 58.4 -- -- -- .cndot. 8 " ##STR53## H <10 9 ##STR54## ##STR55## H .cndot. 46.5 (.cndot. 41.5) .cndot. 64.6 -- .cndot.10 ##STR56## " H .cndot. 97.0 -- -- -- .cndot.11 ##STR57## " H .cndot. 53.8 -- .cndot. 66.7 -- .cndot.12 ##STR58## " H .cndot. 63.0 (.cndot. 30.0) .cndot. 63.5 -- .cndot.13 ##STR59## ##STR60## H .cndot. 59.7 (.cndot. 42.5) .cndot. 62.4 -- .cndot.14 ##STR61## " H .cndot. 50.5 (.cndot. 49.7) .cndot. 63.0 -- .cndot.15 ##STR62## " H .cndot. 57.3 (.cndot. 56.0) .cndot. 62.1 -- .cndot.16 ##STR63## " H .cndot. 54.5 (.cndot. 50.5) .cndot. 62.1 -- .cndot.17 ##STR64## " H .cndot. 39.2 (.cndot. 37.6) .cndot. 53.1 -- .cndot.18 ##STR65## " H .cndot. 47.5 (.cndot. 46.0) .cndot. 52.2 -- .cndot.19 ##STR66## " H .cndot. 47.6 -- -- -- .cndot.20 ##STR67## ##STR68## H .cndot. 119.4 -- -- -- .cndot.21 ##STR69## " H .cndot. 69.0 -- .cndot. 76.5 -- .cndot.22 ##STR70## " H .cndot. 76.6 -- (.cndot. 74.4) -- .cndot.23 ##STR71## " H .cndot. 54.0 .cndot. 56.0 .cndot. 74.4 -- .cndot.24 ##STR72## " H .cndot. 63.0 (.cndot. 51.5) .cndot. 71.0 -- .cndot.25 ##STR73## " H .cndot. 60.7 (.cndot. 53.5) .cndot. 71.5 -- .cndot.26 ##STR74## " H .cndot. 50.1 (.cndot. 46.8) .cndot. 60.7 -- .cndot.27 ##STR75## ##STR76## H .cndot. 94.5 -- -- -- .cndot.28 ##STR77## " H .cndot. 69.1 (.cndot. 49.6) .cndot. 85.5 -- .cndot.29 ##STR78## " H .cndot. 57.0 .cndot. 55.5 .cndot. 86.8 -- .cndot.30 ##STR79## " H .cndot. 59.1 (.cndot. 54.5) .cndot. 86.7 -- .cndot.31 ##STR80## " H .cndot. 55.0 (.cndot. 53.0) .cndot. 86.6 -- .cndot.32 ##STR81## " H .cndot. 61.5 (.cndot. 54.5) .cndot. 85.1 -- .cndot.33 ##STR82## " H .cndot. 56.5 (.cndot. 55.0) .cndot. 84.5 -- .cndot.34 ##STR83## ##STR84## H .cndot. 55.0 (.cndot. 45.2) .cndot. 77.7 -- .cndot.35 ##STR85## " H .cndot. 50.4 (.cndot. 40.5) .cndot. 73.4 -- .cndot.36 ##STR86## ##STR87## H .cndot. 99.5 -- (.cndot. 83.9) .cndot. 100.9 .cndot.37 ##STR88## " H .cndot. 81.7 -- .cndot. 98.7 .cndot. 105.7 .cndot.38 ##STR89## " H .cndot. 70.8 (.cndot. 54.6) .cndot. 100.7 .cndot. 101.9 .cndot.39 ##STR90## " H .cndot. 62.1 (.cndot. 59.0) .cndot. 102.8 -- .cndot.40 ##STR91## " H .cndot. 60.1 .cndot. 66.9 .cndot. 102.9 -- .cndot.41 ##STR92## " H .cndot. 58.4 .cndot. 66.0 .cndot. 104.0 -- .cndot.42 ##STR93## ##STR94## H .cndot. 70.2 .cndot. 73.7 .cndot. 103.8 -- .cndot.43 ##STR95## " H .cndot. 77.2 (.cndot. 71.3) .cndot. 104.0 -- .cndot.44 ##STR96## " H .cndot. 67.6 .cndot. 73.5 .cndot. 103.4 -- .cndot.45 ##STR97## " H .cndot. 59.8 .cndot. 63.6 .cndot. 102.1 -- .cndot.46 ##STR98## " H .cndot. 58.6 .cndot. 66.4 .cndot. 102.1 -- .cndot.47 ##STR99## " H .cndot. 65.6 .cndot. 58.1 .cndot. 100.1 -- .cndot.48 ##STR100## " H .cndot. 59.5 .cndot. 64.0 .cndot. 99.7 -- .cndot.49 ##STR101## " H .cndot. 114.5 -- -- -- .cndot.50 ##STR102## ##STR103## H .cndot. 73.0 (.cndot. 38.8) .cndot. 92.8 -- .cndot.51 ##STR104## " H .cndot. 74.3 (.cndot. 50.8) .cndot. 92.5 -- .cndot.52 ##STR105## " H .cndot. 64.0 (.cndot. 57.4) .cndot. 91.8 -- .cndot.53 ##STR106## " H .cndot. 63.9 (.cndot. 57.5) .cndot. 94.5 -- .cndot.54 ##STR107## " H .cndot. 57.4 .cndot. 58.1 .cndot. 89.0 -- .cndot.55 ##STR108## " H .cndot. 103.1 -- -- -- .cndot.56 ##STR109## ##STR110## H .cndot. 73.7 -- (.cndot. 66.2) -- .cndot.57 ##STR111## " H .cndot. 52.8 -- .cndot. 70.5 -- .cndot.58 ##STR112## " H .cndot. 57.5 -- -- -- .cndot.59 ##STR113## ##STR114## H .cndot. 56.3 .cndot. 73.0 .cndot. 103.3 -- .cndot.60 ##STR115## " H .cndot. 68.8 (.cndot. 67.0) .cndot. 90.3 -- .cndot.61 ##STR116## ##STR117## H .cndot. 72.0 (.cndot. 68.5) .cndot. 91.0 -- .cndot.62 ##STR118## " H .cndot. 75.0 (.cndot. 74.3) .cndot. 88.0 -- .cndot.63 ##STR119## ##STR120## H .cndot. 49.5 -- -- -- .cndot.64 ##STR121## ##STR122## H .cndot. 66.6 .cndot. .cndot. 100.5 -- .cndot.65 ##STR123## " H .cndot. 52.5 .cndot. 64.0 .cndot. 99.2 -- .cndot.66 ##STR124## " H .cndot. 51.6 .cndot. 73.0 .cndot. 99.1 -- .cndot.67 ##STR125## " H .cndot. 54.2 .cndot. 78.5 .cndot. 99.7 -- .cndot.68 ##STR126## " H .cndot. 64.3 .cndot. 80.5 .cndot. 101.3 -- .cndot.69 ##STR127## " H .cndot. 64.9 .cndot. 80.5 .cndot. 98.6 -- .cndot.70 ##STR128## " H .cndot. 58.0 .cndot. 82.9 .cndot. 98.5 -- .cndot.71 ##STR129## ##STR130## H .cndot. 67.7 .cndot. 79.5 .cndot. 98.8 -- .cndot.72 ##STR131## " H .cndot. 58.7 .cndot. 75.9 .cndot. 88.9 -- .cndot.73 ##STR132## ##STR133## H .cndot. 54.5 .cndot. 90.0 .cndot. 100.3 -- .cndot.74 ##STR134## ##STR135## Cl .cndot. 47.5 -- .cndot. 59.5 .cndot. 68.9 .cndot.75 ##STR136## " Cl .cndot. 48.2 -- .cndot. 72.1 -- .cndot.76 ##STR137## ##STR138## H .cndot. 64.5 .cndot. 77.1 .cndot. 85.5 .cndot. 98.7 .cndot.77 ##STR139## " H .cndot. 85.1 -- -- .cndot. 100.7 .cndot.78 ##STR140## ##STR141## H .cndot. 77.2 (.cndot. 71.2) -- .cndot. 102.8 .cndot.79 ##STR142## " H .cndot. 62.0 .cndot. 76.1 .cndot. 76.9 .cndot. 98.0 .cndot.80 ##STR143## " H .cndot. 68.0 .cndot. 79.2 .cndot. 89.0 .cndot. 96.5 .cndot.81 ##STR144## " H .cndot. 67.2 .cndot. 76.9 .cndot. 91.6 .cndot. 97.0 .cndot.82 ##STR145## " H .cndot. 74.3 .cndot. 78.5 .cndot. 92.7 .cndot. 95.5 .cndot.83 ##STR146## " H .cndot. 73.3 .cndot. 75.3 .cndot. 93.7 .cndot. 95.0 .cndot.84 ##STR147## " H .cndot. 79.1 (.cndot. 73.0) .cndot. 93.4 .cndot. 94.0 .cndot.85 ##STR148## " H .cndot. 80.3 -- .cndot. 93.0 -- .cndot.86 ##STR149## " H .cndot. 71.7 -- -- (.cndot. .cndot.87 ##STR150## ##STR151## H .cndot. 82.3 -- -- .cndot. 117.1 .cndot.88 ##STR152## " H .cndot. 71.2 .cndot. 72.6 -- .cndot. 114.6 .cndot.89 ##STR153## " H .cndot. 67.7 .cndot. 89.0 -- .cndot. 110.8 .cndot.90 ##STR154## " H .cndot. 67.0 .cndot. 94.3 .cndot. 95.2 .cndot. 106.0 .cndot.91 ##STR155## " H .cndot. 73.1 .cndot. 94.7 .cndot. 99.4 .cndot. 103.3 .cndot.92 ##STR156## " H .cndot. 79.0 .cndot. 92.7 .cndot. 99.1 .cndot. 101.0 .cndot.93 ##STR157## " H .cndot. 80.3 -- -- .cndot. 86.4 .cndot.94 ##STR158## ##STR159## H .cndot. 57.7 -- -- (.cndot. .cndot.95 ##STR160## " H .cndot. 41.5 .cndot. 47.8 -- .cndot. 59.4 .cndot.96 ##STR161## " H .cndot. 60.0 (.cndot. 49.1) -- (.cndot. .cndot.97 ##STR162## " H .cndot. 65.2 -- -- -- .cndot.98 ##STR163## " H .cndot. 58.0 (.cndot. 50.0) .cndot. 58.9 .cndot. 61.0 .cndot.99 ##STR164## " H .cndot. 57.3 (.cndot. 56.2) .cndot. 61.7 .cndot. 62.0 .cndot.100 ##STR165## " H .cndot. 48.5 .cndot. 53.0 .cndot. 63.5 -- .cndot.101 ##STR166## " H .cndot. 53.5 .cndot. 56.8 .cndot. 65.1 -- .cndot.102 ##STR167## ##STR168## H .cndot. 52.5 .cndot. 54.7 -- .cndot. 59.5 .cndot.103 ##STR169## ##STR170## H .cndot. 61.7 (.cndot. 50.5) -- .cndot. 62.1 .cndot.104 ##STR171## " H .cndot. 57.3 (.cndot. 54.7) .cndot. 57.2 .cndot. 60.3 .cndot.105 ##STR172## ##STR173## H .cndot. 62.2 -- .cndot. 65.8 .cndot. 80.1 .cndot.106 ##STR174## " H .cndot. 50.5 .cndot. 68.1 .cndot. 76.5 .cndot. 78.0 .cndot.107 ##STR175## ##STR176## H .cndot. 64.6 .cndot. 56.5 .cndot. 65.5 .cndot. 72.8 .cndot.108 ##STR177## OC.sub.10 H.sub.21 H .cndot. 76.3 -- -- .cndot. 98.4 .cndot.109 ##STR178## OC.sub.10 H.sub.21 H .cndot. 43.1 -- -- .cndot. 54.3 .cndot.110 ##STR179## OC.sub.10 H.sub.21 H .cndot. 61.5 .cndot. 74.1 -- .cndot. 113.1 .cndot.111 C.sub.8 H.sub.17 O ##STR180## H .cndot. 100.6 -- .cndot. 108.3 .cndot. 108.7 .cndot.112 C.sub.6 H.sub.13 O " H .cndot. 101.6 -- (.cndot. 98.8) .cndot. 108.9 .cndot.113 C.sub.10 H.sub.21 O " H .cndot. 103.0 -- .cndot. 109.5 -- .cndot.114 C.sub.6 H.sub.13 O ##STR181## H .cndot. 74.5 .cndot. 80.4 .cndot. .cndot. 117.8 .cndot.115 C.sub.8 H.sub.17 O " H .cndot. 73.6 .cndot. 84.0 .cndot. 111.1 .cndot. 116.8 .cndot.116 C.sub.10 H.sub.21 O " H .cndot. 60.6 .cndot. 93.6 .cndot. 114.9 -- .cndot.117 C.sub.12 H.sub.25 O " H .cndot. 55.5 .cndot. 96.1 .cndot. 114.1 -- .cndot.118 C.sub.14 H.sub.29 O " H .cndot. 62.0 .cndot. 94.8 .cndot. 110.8 -- .cndot.119 C.sub.4 H.sub.9 O ##STR182## H .cndot. 37.7 -- -- .cndot. 41.0 .cndot.120 C.sub.7 H.sub.15 O " H .cndot. 42.5 -- -- (.cndot. .cndot. C SA Ch I121 ##STR183## ##STR184## H .cndot. 84.6 -- .cndot. 96.9 .cndot.122 " ##STR185## H .cndot. 81.5 -- .cndot. 96.0 .cndot.123 " ##STR186## H .cndot. 79.9 -- .cndot. 94.2 .cndot.124 " ##STR187## H .cndot. 79.6 -- .cndot. 91.0 .cndot.125 ##STR188## ##STR189## H .cndot. 87.6 .cndot. 98.1 .cndot. 113.0 .cndot.126 " ##STR190## H .cndot. 71.8 .cndot. 84.5 .cndot. 110.7 .cndot.127 " ##STR191## H .cndot. 73.7 .cndot. 87.9 .cndot. 108.8 .cndot.128 " ##STR192## H .cndot. 71.4 .cndot. 78.4 .cndot. 104.7 .cndot.129 ##STR193## ##STR194## H .cndot. 52.0 -- -- .cndot.130 " ##STR195## H .cndot. 35.7 -- -- .cndot.131 " ##STR196## H <10 C SC* SA I132 C.sub.8 H.sub.17 O ##STR197## H .cndot. 69.4 -- .cndot. 103.9 .cndot.133 C.sub.10 H.sub.21 O " H .cndot. 85.2 -- .cndot. 103.6 .cndot.134 C.sub.12 H.sub.25 O " H .cndot. 63.4 -- .cndot. 101.4 .cndot.135 C.sub.14 H.sub.29 O " H .cndot. 62.3 -- .cndot. 99.4 .cndot.136 C.sub.10 H.sub.21 O ##STR198## H .cndot. 52.0 -- .cndot. 73.2 .cndot.137 C.sub.12 H.sub.25 O " H .cndot. 57.3 -- .cndot. 71.0 .cndot.138 C.sub.6 H.sub.13 O ##STR199## H .cndot. 79.5 -- .cndot. 101.4 .cndot.139 C.sub.8 H.sub.17 O " H .cndot. 82.8 -- .cndot. 100.9 .cndot.140 C.sub.10 H.sub.21 O " H .cndot. 74.7 -- .cndot. 100.2 .cndot.141 C.sub.12 H.sub.25 O " H .cndot. 59.5 .cndot. 68.0 .cndot. 102.6 .cndot.142 C.sub.14 H.sub.29 O " H .cndot. 68.5 (.cndot. 64.9) .cndot. 95.5 .cndot.143 C.sub.16 H.sub.33 O " H .cndot. 55.8 .cndot. 60.3 .cndot. 88.0 .cndot.144 C.sub.12 H.sub.25 O ##STR200## H .cndot. 62.3 -- .cndot. 73.5 .cndot.145 C.sub.4 H.sub.9 O(CH.sub.2).sub.2 O " H .cndot. 47.0 -- .cndot. 52.5 .cndot.146 C.sub.8 H.sub.17 O ##STR201## H .cndot. 55.5 -- .cndot. 68.7 .cndot.147 C.sub.9 H.sub.19 O " H .cndot. 61.7 -- .cndot. 67.5 .cndot.148 C.sub.10 H.sub.21 O " H .cndot. 57.7 -- .cndot. 67.7 .cndot.149 C.sub.7 H.sub.15 O ##STR202## H .cndot. 60.3 -- .cndot. 65.3 .cndot.150 C.sub.9 H.sub.19 O " H .cndot. 63.7 -- .cndot. 64.8 .cndot.151 C.sub.11 H.sub.23 O " H .cndot. 54.8 -- .cndot. 64.9 .cndot.__________________________________________________________________________
EXAMPLE 152
Preparation of (s)-6-(4"-octyloxybiphenyl-4'-carbonyl)-2-naphthalenecarboxylic acid 2'"-methylbutyl ester
In 300 ml of benzene, 5.0 g of 4'-octyloxybiphenyl-4-carboxylic acid and 20 ml of thionyl chloride were heated at reflux temperature for 5 hours, and afterward the excessive thionyl chloride and benzene were distilled out under reduced pressure. To carboxylic acid chloride of the residual were added 4.0 of (s)-6-hydroxynaphthalene-2-carboxylic acid 2"-methylbutyl ester, 30 ml of pyridine and 300 ml of benzene, and the resulting mixture was heated at reflux for 5 hours. After the mixture had been cooled to room temperature, pyridine hydrochloride was filtered out, and an obtained filtrate was then washed with water, a 10% hydrochloric acid solution, a saturated aqueous NaHCO.sub.3 solution and water in this order, followed by drying with anhydrous magnesium sulfate. After the removal of benzene by distillation, the resulting residue was then separated and purified by the sue of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized out of ethanol-ethyl acetate to prepare 4.5 g of the desired (s)- 6-(4"-octyloxybiphenyl-4'-carbonyloxy)-2-naphthalenecarboxylic acid 2"-methylbutyl ester in the state of a colorless crystal. The yield was 52%. A phase transition temperature of the thus prepared compound is set forth in Table 4. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.37 H.sub.42 O.sub.5) Analytical Value______________________________________C 78.41% 78.50%H 7.47% 7.43%______________________________________
When measured at a 10.degree. C. lower temperature than an SC*-SA transition temperature, a value of a spontaneous polarization (Ps) was 5 nC/cm.sup.2.
EXAMPLES 153 TO 164
The same procedure as in Example 152 was repeated with the exception that 4'-octyloxybiphenyl-4-carboxylic acid was replaced with various 4'-alkyloxybiphenyl-4-carboxylic acids, 4'-alkylbiphenyl-4-carboxylic acids or 3'-halogeno -4'-alkyloxybiphenyl-4-carboxylic acids, or that 6-hydroxynaphthalene-2-carboxylic acid 2"-methylbutyl ester was replaced with various optically active 5-halogeno-6-hydroxynaphthalene-2-carboxyl acid alkyl esters or optically active 6-hydroxynaphthalene-2-carboxylic acid alkyl esters, in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 4.
EXAMPLE 165
Preparation of (s)-6-(2'-methylbutyloxy)-2-naphthyl-4"-octyloxybiphenyl-4'"-carboxylic acid ester
To 30 ml of methylene chloride were added 400 mg of 4'-octyloxybiphenyl-4-carboxylic acid, 290 mg of (s)-6-(2'-methylbutyloxy)--2-naphthol, 260 mg of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 20 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate.
After the removal of methylene chloride by distillation, the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized out of ethanol-ethyl acetate to prepare 280 mg of the desired 6-((s)-2'-methylbutyloxy)--2-naphthyl-4"-octyloxybiphenyl-4'"-carboxylic acid ester in the state of a colorless needle crystal. The yield was 42%. A phase transition temperature of the thus prepared compound is set forth in Table 4. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.36 H.sub.42 O.sub.4) Analytical Value______________________________________C 80.26% 80.07%H 7.86% 7.85%______________________________________
When measured at a 10.degree. C lower temperature than an SC*-SA transition temperature, a value of a spontaneous polarization Ps) was 2 nC/cm.sup.2.
EXAMPLES 166 TO 170
The same procedure as in Example 165 was repeated with the exception that 4'-octyloxybiphenyl-4-carboxylic acid was replaced with various 4'-alkyloxybiphenyl-4-carboxylic acids or optically active 4'-alkyloxybiphenyl-4-carboxylic acids, and that (s)-6-(2'-methylbutyloxy)--2-naphthol was replaced with various optically active 6-(alkyloxy)--2-naphthols, 6-alkyloxy-2-naphthol or 6-alkyl-2-naphthol in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 4.
TABLE 4__________________________________________________________________________ Example ##STR203## Phase transition temperature (.degree.C.)Number Wherein A represents Wherein B represents X C SC* SA Ch I__________________________________________________________________________152 ##STR204## ##STR205## H .cndot. 93.7 .cndot. 168.2 .cndot. 247.1 -- .cndot.153 " " Cl .cndot. 118.7 (.cndot. 97.5) .cndot. 198.4 .cndot. 215.4 .cndot.154 ##STR206## ##STR207## H .cndot. 107.5 .cndot. 146.5 .cndot. 200.5 -- .cndot.155 ##STR208## " H .cndot. 87.0 .cndot. 105.0 .cndot. 185.5 -- .cndot.156 ##STR209## " H .cndot. 78.5 .cndot. 117.0 .cndot. 183.0 -- .cndot.157 ##STR210## ##STR211## H .cndot. 105.0 .cndot. 127.3 .cndot. 199.5 -- .cndot.158 ##STR212## " H .cndot. 109.1 .cndot. 147.8 .cndot. 192.4 -- .cndot.159 ##STR213## " H .cndot. 111.3 .cndot. 150.5 .cndot. 180.5 -- .cndot.160 ##STR214## ##STR215## H .cndot. 72.5 .cndot. 76.5 .cndot. 170.8 -- .cndot.161 ##STR216## " H .cndot. 85.5 .cndot. 107.1 .cndot. 161.5 -- .cndot.162 ##STR217## " H .cndot. 74.5 .cndot. 127.5 .cndot. 158.5 -- .cndot.163 ##STR218## ##STR219## H .cndot. 87.5 .cndot. 90.5 .cndot. 169.5 -- .cndot.164 ##STR220## " H .cndot. 90.3 .cndot. 118.0 .cndot. 186.5 -- .cndot.165 ##STR221## ##STR222## H .cndot. 147.8 .cndot. 171.0 .cndot. 216.2 .cndot. 230.0 .cndot.166 ##STR223## OC.sub.10 H.sub.21 H .cndot. 128.1 .cndot. 176.0 .cndot. 183.7 .cndot. 221.8 .cndot.167 ##STR224## ##STR225## H .cndot. 121.0 -- .cndot. 192.3 .cndot. 197.6 .cndot.168 ##STR226## ##STR227## H .cndot. 132.0 .cndot. 138.5 .cndot. 192.5 .cndot. 195.5 .cndot.169 ##STR228## C.sub.6 H.sub.13 H .cndot. 75.0 .cndot. 90.5 .cndot. 110.2 .cndot. 141.0 .cndot.170 " C.sub.7 H.sub.15 H .cndot. 72.7 .cndot. 91.1 .cndot. 112.0 .cndot. 140.0 .cndot.__________________________________________________________________________
EXAMPLE 171
Preparation of (s)-6-(6'-hexyloxynaphthalene-2'-carbonyloxy)naphthalene-2-carboxylic acid 2"-methylbutyl ester
In 40 ml of methylene chloride were dissolved 530 mg of 6-hexyloxynaphthalene-2-carboxylic acid, 500 mg of (s)-6-hydroxynaphthalene-2-carboxylic acid 2'-methylbutyl ester, 400 mg of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 5 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate.
After the removal of methylene chloride by distillation, the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized out of ethanol-ethyl acetate ester to prepare 580 mg of the desired (s)-6-(6'-hexyloxynaphthalene-2'-carbonyloxy)naphthalene-2-carboxylic acid 2"-methylbutyl ester in the state of a colorless lamellar crystal. The yield was 58%. A phase transition temperature of the thus prepared compound is set forth in Table 5. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.33 H.sub.36 O.sub.5) Analytical Value______________________________________C 77.31% 77.30%H 7.08% 7.10%______________________________________
EXAMPLES 172 TO 176
The same procedure as in Example 171 was repeated with the exception that 6-hexyloxynaphthalene-2-carboxylic acid was replaced with various 6-alkoxynaphthalene-2-carboxylic acid in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 5.
EXAMPLE 177
Preparation of (s)-6-decyloxy-2-naphthyl-6'-(2"-methylbutyloxy)naphthalene-2'-carboxylic acid ester
To 20 ml of methylene chloride were added 300 mg of (s)-6-(2'-methylbutyloxy)naphthalene-2-carboxylic acid, 350 mg of 6-decyloxy-2-naphthol, 240 mg of N,N'-dicyclohexylcarbodiimide and 10 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 3 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate.
After the removal of methylene chloride by distillation, the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was recrystallized out of ethanol-ethyl acetate to prepare 320 mg of the desired (s)-6-decyloxy-2-naphthyl-6'-(2"-methylbutyloxy)naphthalene-2'-carboxylic acid ester in the state of a colorless needle crystal. The yield was 51%. A phase transition temperature of the thus prepared compound is set forth in Table 5. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.36 H.sub.44 O.sub.4) Analytical Value______________________________________C 79.96% 80.03%H 8.20% 8.15%______________________________________
EXAMPLE 178
The same procedure as in Example 177 was repeated with the exception that (s)-6-(2'-methylbutyloxy)naphthalene-2-carboxylic acid was replaced with (s)-6-(4'-methylhexyloxy)naphthalene-2-carboxylic acid in order to prepare an optically active ester compound. Its phase transition temperature which is a physical value is set forth in Table 5.
TABLE 5__________________________________________________________________________ Example ##STR229## Phase transition temperature (.degree.C.)Number Wherein A represents Wherein B represents X C SX SA Ch I__________________________________________________________________________171 ##STR230## ##STR231## H .cndot. 133.3 -- .cndot. 152.7 .cndot. 157.4 .cndot.172 ##STR232## " H .cndot. 82.5 -- .cndot. 152.5 -- .cndot.173 ##STR233## " H .cndot. 76.9 (.cndot. 63.1) .cndot. 150.0 -- .cndot.174 ##STR234## " H .cndot. 91.1 (.cndot. 76.5) .cndot. 147.8 -- .cndot.175 ##STR235## " H .cndot. 71.8 (.cndot. 66.4) .cndot. 144.4 -- .cndot.176 ##STR236## " H .cndot. 71.1 .cndot. 76.5 .cndot. 141.5 -- .cndot.177 ##STR237## C.sub.10 H.sub.21 H .cndot. 95.0 -- -- .cndot. 143.3 .cndot.178 ##STR238## C.sub.10 H.sub.21 H .cndot. 85.7 .cndot. 107.5 -- .cndot. 153.9 .cndot.__________________________________________________________________________
EXAMPLE 179
Preparation of (R)--6-(trans-4'-butylcyclohexylcarbonyloxy)-2-naphthalenecarboxylic acid 1"-methylheptyl ester
In 50 ml of chloroform were dissolved 1 g of trans-4-butylcyclohexylcarboxylic acid, 1.7 g of (R)-6-hydroxynapthalene-2-carboxylic acid 1'-methylheptyl ester, 1.2 g of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 8 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 2N hydrochloric acid solution, a 2N aqueous sodium hydroxide solution and water in this order.
This material was then purified by the use of a silica gel column chromatography-utilizing benzene as an eluent in order to prepare 1.2 g of the desired (R)--6-(trans-4'-butylcyclohexylcarbonyloxy)-2-naphthalenecarboxylic acid 1"-methylheptyl ester in a colorless oily state. The yield was 47%. A phase transition temperature of the thus prepared compound is set forth in Table 6. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.30 H.sub.42 O.sub.4) Analytical Value______________________________________C 77.21% 77.25%H 9.07% 9.10%______________________________________
EXAMPLE 180
The same procedure as in Example 179 was repeated with the exception that trans-4-butylcyclohexylcarboxylic acid was replaced with trans-4-nonylcyclohexylcarboxylic acid in order to prepare an optically active ester compound. Its phase transition temperature which is a physical value is set forth in Table 6.
EXAMPLES 181 TO 184
The same procedure as in Example 179 was repeated with the exception that trans-4-butylcyclohexylcarboxylic acid was replaced with various trans-4-alkylcyclohexylcarboxylic acids and that (R)-6-hydroxynaphthalene-2-carboxylic acid 1'-methylheptyl ester was replaced with various optically active 6-hydroxynaphthalene-2-carboxylic acid alkyl esters in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 6.
TABLE 6__________________________________________________________________________ Example ##STR239## Phase transition temperature (.degree.C.)Number Wherein A represents Wherein B represents X C SC* SA Ch I__________________________________________________________________________179 ##STR240## ##STR241## H <10180 ##STR242## " H <10181 ##STR243## ##STR244## H <10182 ##STR245## " H <10183 ##STR246## ##STR247## H <10184 ##STR248## ##STR249## H <10__________________________________________________________________________
EXAMPLE 185
Preparation of (s)-3-chloro-4-(6'-tetradecyloxy-2'-naphthoyloxy)benzoic acid 4"-(2"'-methylbutyloxy)phenyl ester
(i) Preparation of (s)-3-chloro-4-hydroxybenzoic acid-4'-(2"'-methylbutyloxy)phenyl ester:
This compound was prepared from (s)-4-(2'-methylbutyloxy)phenol and 4-hydroxy-3-chlorobenzoic acid in accordance with a method described in the literature, J. Org. Chem. 40, 2998 (1975). A melting point of the product was within the range of 165.2.degree. to 166.8.degree. C.
(ii) In 30 ml of methylene chloride were dissolved 500 mg of 3-chloro-4-hydroxybenzoic acid-4'-(2"'-methylbutyloxy)phenyl ester obtained in the above process (i), 500 mg of 6-tetradecyloxynaphthalene-2-carboxylic acid, 300 mg of N,N'-dicyclohexylcarbodiimide and 20 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 20 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate.
After the removal of methylene chloride by distillation, the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent. The thus obtained crystal was then recrystallized out of ethanol-ethyl acetate to prepare 600 mg of the desired (s)-3-chloro-4-(6'-tetradecyloxy-2'-naphthoyloxy)benzoic acid 4"-(2"'-methylbutyloxy)phenyl ester in the state of a colorless needle crystal. The yield was 60%. A phase transition temperature of the thus prepared compound is set forth in Table 7. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.33 H.sub.53 O.sub.6 Cl) Analytical Value______________________________________C 68.19% 68.25%H 9.19% 9.18%Cl 6.10% 6.05%______________________________________
When measured at a 10.degree. C lower temperature than an SC*-SA transition temperature, a value of a spontaneous polarization (Ps) was 2 nC/cm.sup.2.
EXAMPLES 186 TO 189
The same procedure as in the process (ii) of Example 185 was repeated with the exception that 6-tetradecyloxynaphthalene-2-carboxylic acid was replaced with various 6-alkyloxynaphthalene-2-carboxylic acids in order to prepare various (s)-3-chloro-4-(6 -alkyloxy-2'-naphthoyloxy)benzoic acid 4"-(2"'-methylbutyloxy)phenyl esters. With regard to typical ones of the thus obtained products, their phase transition temperatures are set forth in Table 7.
TABLE 7__________________________________________________________________________ ##STR250##Example Wherein A Wherein B Phase transition temperature (.degree.C.)Number represents represents X C SC* SA Ch I__________________________________________________________________________185 C.sub.14 H.sub.29 O ##STR251## H .cndot. 85.2 .cndot. 112.9 .cndot. 141.5 .cndot. 164.0 .cndot.186 C.sub.8 H.sub.17 O " H .cndot. 100.5 -- (.cndot. 74.3) .cndot. 186.4 .cndot.187 C.sub.10 H.sub.21 O " H .cndot. 94.6 .cndot. 109.8 .cndot. 121.0 .cndot. 176.3 .cndot.188 C.sub.12 H.sub.25 O " H .cndot. 88.5 .cndot. 110.3 .cndot. 136.3 .cndot. 169.6 .cndot.189 C.sub.16 H.sub.33 O " H .cndot. 92.3 .cndot. 113.4 .cndot. 140.5 .cndot. 153.8 .cndot.__________________________________________________________________________
EXAMPLE 190
Preparation of (s)-6-octyloxynaphthalene-2-carboxylic acid 2'-methylbutyl ester
In 50 ml of toluene, 2 g of 6-octyloxynaphthalene-2-carboxylic acid and 5 ml of thionyl chloride were heated at reflux temperature for 5 hours. The used toluene and excessive thionyl chloride were distilled out under reduced pressure, and the resulting residue was then dissolved in 20 ml of toluene and was added to 10 ml of a pyridine solution containing 1 g of (s)-2-methylbutanol, followed by stirring at room temperature for 10 hours. The reaction mixture was then washed with a 20% hydrochloric acid solution, a 10% aqueous sodium hydroxide solution and water in this order. An organic layer was then dried with anhydrous magnesium sulfate. After the removal of toluene by distillation, a residual oil was then purified by the use of a silica gel column chromatography. The thus purified oil was dissolved in 5 ml of n-hexane and was then cooled at -20.degree. C. to prepare 1.2 g of the desired (s)-6-octyloxynaphthalene-2-carboxylic acid 2'-methylbutyl ester in the state of a colorless lamellar crystal. The yield was 49%.
A phase transition temperature of the thus prepared compound is set forth in Table 8. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.24 H.sub.34 O.sub.3) Analytical Value______________________________________C 77.80% 77.85%H 9.25% 9.19%______________________________________
EXAMPLE 191 TO 199
The same procedure as in Example 190 was repeated with the exception that 6-octyloxynaphthalene-2-carboxylic acid was replaced with various 6-alkyloxynaphthalene-2-carboxylic acids or various 6-alkylnaphthalene-2-carboxylic acids, in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 8.
EXAMPLES 200 TO 225
The same procedure as in Example 190 was repeated with the exception that 6-octyloxynaphthalene-2-carboxylic acid was replaced with various 6-alkyloxynaphthalene-2-carboxylic acids, and that (s)-2-methylbutanol was replaced with various optically active alcohols, in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 8.
EXAMPLE 226
Preparation of (s)-4-methylcaproic acid-2'-(6'-decyloxy)naphthyl ester
To a 15 ml of methylene chloride were added 600 mg of 6-decyloxy-2-naphthol, 260 mg of (s)-4-methylcaproic acid, 420 mg of N,N'-dicyclohexylcarbodiimide and 10 mg of 4-pyrrolidinopyridine, and the resulting mixture was then allowed to stand at room temperature for 2 hours. A secondarily produced N,N'-dicyclohexyl urea was then filtered out, and an organic layer was washed with a 5% hydrochloric acid solution, a 5% aqueous sodium hydroxide solution and water in this order, followed by drying with anhydrous magnesium sulfate.
After the removal of methylene chloride by distillation, the resulting residue was then purified by the use of a silica gel column chromatography utilizing benzene as an eluent in order to prepare 600 mg of the desired (s)-4-methylcaproic acid-2'-(6'-decyloxy)naphthyl ester. The yield was 73%. A phase transition temperature of the thus prepared compound is set forth in Table 8. Analytical values of elements constituting this compound are closely in accord with theoretical values, as follows:
______________________________________Theoretical Value (as C.sub.27 H.sub.40 O.sub.3) Analytical Value______________________________________C 78.59% 78.40%H 9.77% 9.80%______________________________________
EXAMPLE 227 TO 229
The same procedure as in Example 226 was repeated with the exception that 6-decyloxy-2-naphthol was replaced with various 6-alkyloxy-2-naphthols, in order to prepare various optically active esters. Their phase transition temperatures which are physical values are set forth in Table 8.
EXAMPLES 230 TO 233
The same procedure as in Example 226 was repeated with the exception that 6-decyloxy-2-naphthol was replaced with various 6-alkyloxy-2-naphthols, and that (s)-4-methylcaproic acid was replaced with various optically active carboxylic acids, in order to prepare various optically active ester compounds. Their phase transition temperatures which are physical values are set forth in Table 8.
TABLE 8__________________________________________________________________________ ##STR252## Phase transitionExample Wherein Wherein B temperature (.degree.C.)Number A represents represents X C I__________________________________________________________________________190 C.sub.8 H.sub.17 O ##STR253## H .cndot. 15 .cndot.191 C.sub.6 H.sub.13 O " H .cndot. 21 .cndot.192 C.sub.9 H.sub.19 O " H .cndot. 17 .cndot.193 C.sub.10 H.sub.21 O " H .cndot. 13 .cndot.194 C.sub.11 H.sub.23 O " H .cndot. 10 .cndot.195 C.sub.12 H.sub.25 O " H .cndot. 8 .cndot.196 C.sub.14 H.sub.29 O " H .cndot. 12 .cndot.197 C.sub.16 H.sub.33 O " H .cndot. 17 .cndot.198 C.sub.18 H.sub.37 O " H .cndot. 16 .cndot.199 C.sub.8 H.sub.17 " H <0200 C.sub.6 H.sub.13 O ##STR254## H .cndot. 21 .cndot.201 C.sub.8 H.sub.17 O ##STR255## H .cndot. 17 .cndot.202 C.sub.10 H.sub.21 O " H .cndot. 14 .cndot.203 C.sub.11 H.sub.23 O " H .cndot. 10 .cndot.204 C.sub.12 H.sub.25 O " H .cndot. 14 .cndot.205 C.sub.14 H.sub.29 O " H .cndot. 12 .cndot.206 C.sub.16 H.sub.33 O " H .cndot. 15 .cndot.207 C.sub.18 H.sub.37 O " H .cndot. 18 .cndot.208 C.sub.6 H.sub.13 O ##STR256## H .cndot. 19 .cndot.209 C.sub.8 H.sub.17 O " H .cndot. 13 .cndot.210 C.sub.10 H.sub.21 O " H .cndot. 12 .cndot.211 C.sub.14 H.sub.29 O " H .cndot. 12 .cndot.212 C.sub.16 H.sub.33 O ##STR257## H .cndot. 14 .cndot.213 C.sub.18 H.sub.37 O " H .cndot. 13 .cndot.214 C.sub.6 H.sub.13 O ##STR258## H .cndot. 20 .cndot.215 C.sub.8 H.sub.17 O " H .cndot. 17 .cndot.216 C.sub.10 H.sub.21 O " H .cndot. 14 .cndot.217 C.sub.12 H.sub.25 O " H .cndot. 15 .cndot.218 C.sub.10 H.sub.21 O ##STR259## H .cndot. 18 .cndot.219 C.sub.10 H.sub.21 O ##STR260## H <0220 C.sub.8 H.sub.17 O ##STR261## H <0221 C.sub.8 H.sub.17 O ##STR262## H .cndot. 12 .cndot.222 C.sub.9 H.sub.19 O ##STR263## H <10223 C.sub.11 H.sub.23 O ##STR264## H <10224 C.sub.10 H.sub.21 O ##STR265## H <10225 C.sub.10 H.sub.21 O ##STR266## H <10226 C.sub.10 H.sub.21 O ##STR267## H .cndot. 34.9 .cndot.227 C.sub.8 H.sub.17 O " H .cndot. 31.0 .cndot.228 C.sub.12 H.sub.25 O " H .cndot. 30.3 .cndot.229 C.sub.14 H.sub.29 O " H .cndot. 32.0 .cndot.230 C.sub.8 H.sub.17 O ##STR268## H .cndot. 51.5 .cndot.231 C.sub.10 H.sub.21 O " H .cndot. 46.5 .cndot.232 C.sub.8 H.sub.17 O ##STR269## H .cndot. 27.5 .cndot.233 C.sub.10 H.sub.21 O ##STR270## H .cndot. 26.2 .cndot.__________________________________________________________________________
EXAMPLE 234
A liquid crystal composition was prepared from the following three liquid crystal compounds of the present invention ##STR271## in amounts of 4 parts, respectively.
The thus prepared liquid crystal composition was indicative of an SC* phase at a temperature up to 47.degree. C., an SA phase within the range of 47.degree. to 95.degree. C., and the state of an isotropic liquid at a higher temperature. Therefore, this composition is desirable as a material for display elements used in the vicinity of room temperature.
This composition was afterward placed in a cell having a pair of electrodes a space between which was 5 .mu.m and which had been subjected to a rhombic vapor deposition of silica. The liquid crystal cell was then put between two light polarizers disposed in the relation of crossed Nicols, and an alternating voltage of 10 V having a low frequency (1 Hz) was applied to the cell. At this time, a clear switching phenomenon was observed and a contrast of the cell was very sharp, and in addition, a response speed was fairly high (80 .mu.sec). In this case, a value of a spontaneous polarization (Ps) was 42 nC/cm.sup.2.
EXAMPLE 235
A liquid crystal composition was prepared from the following three liquid crystal compounds of the present invention ##STR272## in amounts of 2 parts, respectively.
The thus prepared liquid crystal composition was indicative of an SC* phase at a temperature up to 40.degree. C., an SA phase within the range of 40.degree. to 67.degree. C., and the state of an isotropic liquid at a higher temperature. Therefore, this composition is desirable as a material for display elements used in the vicinity of room temperature.
This composition was afterward placed in a cell having a pair of electrodes a space between which was 5 .mu.m and which had been subjected to a rhombic vapor deposition of silica. The liquid crystal cell was then put between two light polarizers disposed in the relation of crossed Nicols, and an alternating voltage of 10 V having a low frequency (1 Hz) was applied to the cell. At this time, a clear switching phenomenon was observed and a contrast on the cell was very sharp, and in addition a response speed was fairly high (100 .mu.sec). In this case, a value of a spontaneous polarization (Ps) was 38 nC/cm.sup.2.
EXAMPLE 236
A liquid crystal composition was prepared from a known liquid crystal compound having the formula ##STR273## (in this compound, a phase transition temperature was a ##STR274## and a response speed was 1 msec) in an amount of 10 parts and a compound of the present invention having the formula ##STR275## in an amount of 1 part.
The thus prepared composition was indicative of the following phase transition temperature: ##STR276##
Similarly, this composition was placed in the same cell as in Example 234 and a response speed was then measured. It was 500 .mu.sec, and this fact indicates that the conventional compound was remarkably improved in point of the response speed.
EXAMPLE 237
Following the same procedure as in Example 236, a composition was prepared by mixing a compound of the present invention having the formula ##STR277## in an amount of 1 part with a liquid crystal compound (response speed 1 msec) of the present invention having the formula ##STR278## in an amount of 10 parts. The thus prepared composition had the following phase transition temperature: ##STR279##
Therefore, the composition can work at room temperature. Further, a response speed of the composition was 200 .mu.sec which was much higher than that of the mixture in Example 236.
As is apparent from the foregoing, among the compounds of the present invention, even ones which do not show any liquid crystal phase can work at a temperature in the vicinity of room temperature and can thus be considered to be useful to obtain liquid crystal compositions having a high response speed.
EXAMPLE 238
The compound prepared in Example 9 and known optically active 4-l -decyloxybenzylidene-4'-amino-2"-methylbuthyl cinnamate (DOBAMBC) having the chemical structure 1 in Table 1 were each placed in a sample tube, and each sample was allowed to stand in an atmosphere at a temperature 60.degree. C. and a humidity of 90% for 40 hours, and before and after this standing step, the variation of an SC*-SA transition temperature was measured.
The SC*-SA transition temperature of DOBAMBC dropped as much as 20.degree. C. of from 95.degree. to 75.degree. C., whereas that of the compound prepared in Example 9 did not vary at all. This fact indicates that the latter compound is very stable to the moisture.
EXAMPLE 239
The compound prepared in Example 9 and the known DOBAMBC were each placed in a glass tube, and light irradiation was carried out for 30 hours by the use of a carbon arc. Before and after the irradiation step, the variation of an SC*-SA transition temperature was measured.
The SC*-SA transition temperature of DOBAMBC dropped as much as 20.degree. C. of from 95.degree. C. to 75.degree. C., whereas that of the compound prepared in Example 9 did not vary at all. This fact indicates that the latter compound is very stable to the light.

Number	Name	Date
3925237	Ross et al.	Dec 1975
4113647	Coates et al.	Sep 1978
4261651	Gray et al.	Apr 1981
4261652	Gray et al.	Apr 1981
4291948	Crossland et al.	Sep 1981
4340498	Sugimori	Jul 1982
4357078	Carr et al.	Nov 1982
4386007	Krause et al.	May 1983
4585575	Sugimari et al.	Apr 1986
4610805	Schellenberger et al.	Sep 1986
4613209	Goodby et al.	Sep 1986
4680137	Isoyama et al.	Jul 1987
4943651	Nishiyama et al.	Jul 1990

Number	Date	Country
3515373	Nov 1986	DEX
60-89449	May 1985	JPX
60-248790	Dec 1985	JPX
62-10045	Jan 1987	JPX
63-17847	Jan 1988	JPX
63-17848	Jan 1988	JPX
63-166850	Jul 1988	JPX
01128951	May 1989	JPX
1603075	Nov 1981	GBX
2166754	May 1986	GBX
8701717	Mar 1987	WOX
8706577	Nov 1987	WOX

Optically active naphthalene derivatives

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Destrade et al., Mol. Cryst. Liq. Cryst., vol. 127, pp. 273-282 (1985).
Tinh et al., Mol. Cryst. Liq. Cryst., vol. 4(3-4), pp. 87-92 (Jan. 1987).
Demus (ed.), Flussigekristalle in Tabellen, pp. 234-242 (1976).
Demus (ed.), Flussigekristalle in Tabellen II, pp. 314-324 (1984).