Claims
- 1. A 1,4-disubstituted 2,6-difluorobenzene compound of formula wherein R is an alkyl radical having 1 to 15 carbon atoms which is unsubstituted or at least monosubstituted by halogen, it also being possible for one or more CH2 groups in these radicals to be replaced, in each case independently of one another, by in such a manner that oxygen atoms are not linked directly to one another, A1 and A2, in each case independently of one another, are(a) a trans-1,4-cyclohexylene radical in which, in addition, one or more non-adjacent CH2 groups may be replaced by —O—and/or —S, (b) a 1,4-phenylene radical in which in addition, one or two CH groups may be replaced by N, or (c) a radical from the group comprising 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, it being possible for the radicals (a) and (b) to be substituted by CN or monosubstituted or disubstituted by fluorine, Z1 and Z2 in each case independently of one another, are —CO—O—, —O—CO—, —CH2O—, —OCH2—, —CH2CH2—, —CH═CH—, —C≡C—or a single bond m and n in each case independently of one another, are 0, 1, or 2 , where (m+n) is 1, 2 or 3, and X is —OCF3, or —OCHF2, with the proviso that at least one of the radicals A1and A2 present in the molecule is and at least one of the radicals Z1 and Z2 present in the molecule is —CO—O.
- 2. A liquid-crystalline medium containing at least two liquid-crystalline components, wherein at least one component is at least one compound of the formula I according to claim 1.
- 3. A liquid-crystalline element containing at least two liquid-crystalline components, comprising a dielectric which is a liquid-crystalline medium according to claim 2.
- 4. An electrooptical display, comprising a dielectric which is a liquid-crystalline medium according to claim 2.
Priority Claims (4)
Number |
Date |
Country |
Kind |
39 40 343 |
Dec 1989 |
DE |
|
39 41 881 |
Dec 1989 |
DE |
|
40 00 535 |
Jan 1990 |
DE |
|
40 00 534 |
Jan 1990 |
DE |
|
Parent Case Info
This is a divisional application of application Ser. No. 08/917,167, filed Sep. 18, 1997, which is a continuation of application Ser. No. 08/449,559, filed May 24, 1995, which is a divisional of application Ser. No. 08/402,555, filed Mar. 13, 1995, which is a continuation Ser. No. 07/659,320, filed Feb. 22, 1991, now abandoned, which is a 371 of PCT/EP90/02109 of Dec. 6, 1990.
US Referenced Citations (21)
Foreign Referenced Citations (3)
Number |
Date |
Country |
064 193 |
Apr 1982 |
EP |
317 175 |
Nov 1988 |
EP |
387 032 |
Mar 1990 |
EP |
Non-Patent Literature Citations (3)
Entry |
Chemical Abstracts, Band 107, No. 20, Nov. 16, 1987, p. 793. |
Chemical Abstracts, Band 100, No. 14, Apr. 3, 1989, p. 360. |
G.W. Gray et al., Molecular Crystals and Liquid Crystals, Band 172, Jul. 1988, pp. 165-189. |
Continuations (2)
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Number |
Date |
Country |
Parent |
08/449559 |
May 1995 |
US |
Child |
08/917167 |
|
US |
Parent |
07/659320 |
Feb 1991 |
US |
Child |
08/402555 |
|
US |