Claims
- 1. A compound of the formula: ##STR7## wherein X.sup.1 is chlorine and X.sup.2 is hydrogen; R.sup.1 is 3E-alkenyl, 4-alkenyl, 2E-alkenyloxy, or 3-alkenyloxy; n is the integer 0 or 1; one of the groups Y.sup.1 and Y.sup.2 is a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 -- and the other of the groups Y.sup.1 and Y.sup.2 is single covalent bond; and each of the rings A.sup.1 and A.sup.2 individually is trans-1,4-cyclohexylene, trans-1,4-cyclohexylene in which in two non-adjacent CH.sub.2 groups are replaced by oxygen, 1,4-phenylene, or 1,4-phenylene in which 1 CH group or 2 CH groups are replaced by nitrogen, the above substituents for rings A.sup.1 and A.sup.2 being unsubstituted or substituted with at least one of cyano, lower alkyl, or halo.
- 2. The compound of claim 1, wherein ring A.sup.1 is substituted or unsubstituted trans-1,4-cyclohexylene, substituted or unsubstituted 1,4-phenylene or pyridine-2,5-diyl, pyrimidine-2,5-diyl or pyrazine-2,5-diyl.
- 3. The compound of claim 1, wherein ring A.sup.2 is substituted or unsubstituted trans-1,4-cyclohexylene, substituted or unsubstituted 1,4-phenylene or, when ring A.sup.1 is substituted or unsubstituted trans-1,4-cyclohexylene or substituted or unsubstituted 1,4-phenylene, ring A.sup.2 also can be pyrimidine-2,5-diyl or trans-m-dioxane-2,5-diyl.
- 4. The compound of claim 1, wherein ring A.sup.1 is trans-1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl or pyrazine-2,5-diyl and ring A.sup.2 is trans-1,4-cyclohexylene.
- 5. The compound of claim 1, having the formula ##STR8## wherein R.sup.1, X.sup.1, X.sup.2 and Y.sup.1 have the significances given in claim 1.
- 6. The compound of claim 1, wherein R.sup.1 is a straight-chain residue having the significance given in claim 1.
- 7. The compound of claim 1, wherein R.sup.1 is 3E-alkenyl with 4 to 15 carbon atoms, 4-alkenyl with 5 to 15 carbon atoms, 2E-alkenyloxy with 3 to 14 carbon atoms or 3-alkenyloxy with 4 to 14 carbon atoms.
- 8. A liquid crystalline mixture having at least two components, wherein at least one of such components is a compound of the formula: ##STR9## wherein X.sup.1 is chlorine and X.sup.2 is hydrogen; R.sup.1 is 3-E-alkenyl, 4-alkenyl, 2E-alkenyloxy, or 3-alkenyloxy; n is the integer 0 or 1; one of the groups Y.sup.1 and Y.sup.2 is a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 -- and the other of the groups Y.sup.1 and Y.sup.2 is single covalent bond; and each of the rings A.sup.1 and A.sup.2 individually is trans-1,4-cyclohexylene, trans-1,4-cyclohexylene in which in two non-adjacent CH.sub.2 groups are replaced by oxygen, 1,4-phenylene, or 1,4-phenylene in which 1 CH group or 2 CH groups are replaced by nitrogen, the above substituents for rings A.sup.1 and A.sup.2 being unsubstituted or substituted with at least one of cyano, lower alkyl, or halo.
- 9. An electro-optical cell comprising:
- (a) two plate means;
- (b) liquid crystal means disposed between two plate means including a compound of the formula: ##STR10## wherein X.sup.1 is chlorine and X.sup.2 is hydrogen; R.sup.1 is 3E-alkenyl, 4-alkenyl, 2E-alkenyloxy, or 3-alkenyloxy; n is the integer 0 or 1; one of the groups Y.sup.1 and Y.sup.2 is a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 -- and the other of the groups Y.sup.1 and Y.sup.2 is single covalent bond; and each of the rings A.sup.1 and A.sup.2 individually is trans-1,4-cyclohexylene, trans-1,4-cyclohexylene in which in two non-adjacent CH.sub.2 groups are replaced by oxygen, 1,4-phenylene, or 1,4-phenylene in which 1 CH group or 2 CH groups are replaced by nitrogen, the above substituents for rings A.sup.1 and A.sup.2 being unsubstituted or substituted with at least one of cyano, lower alkyl, or halo; and
- (c) means for applying an electrical potential to said plate means.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4344/87 |
Nov 1987 |
CHX |
|
3080/88 |
Aug 1988 |
CHX |
|
Parent Case Info
This is a division of application Ser. No. 07/262,652 filed Oct. 26, 1988 now U.S. Pat. No. 5,230,826.
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Divisions (1)
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Number |
Date |
Country |
Parent |
262652 |
Oct 1988 |
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