Claims
- 1. A liquid crystal compound having a terminal structure --A.sup.2 --Q--CHF.sub.2, wherein A.sup.2 is 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene, and Q is attached to the 4-position of A.sup.2 and is --O-- or a single bond.
- 2. A compound according to claim 1, wherein A.sup.2 is 3-fluoro-1,4-phenylene.
- 3. A liquid crystal compound according claim 1, wherein A.sup.2 is 3,5-difluoro-1,4-phenylene.
- 4. A compound according to claim 2, wherein Q is --O--.
- 5. A compound according to claim 2, wherein Q is a single bond.
- 6. A compound according to claim 3, wherein Q is --O--.
- 7. A compound according to claim 3, wherein Q is a single bond.
- 8. In a liquid crystal medium containing at least two components, the improvement wherein one of said components is at least one compound according to claim 1.
- 9. In an electrooptical display containing a liquid crystal medium, the improvement wherein said medium is a medium according to claim 8.
- 10. A compound according to claim 3, wherein said terminal structure --A.sup.2 --Q--CHF.sub.2 is attached to the remainder of said liquid crystal compound by group Z.sup.1, wherein Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH-- or --C.tbd.C--.
- 11. A compound according to claim 3, wherein said terminal structure --A.sup.2 --Q--CHF.sub.2 is attached to the remainder of said liquid crystal compound by group A.sup.1,
- wherein
- A.sup.1 is
- (a) trans-1,4-cyclohexylene or trans-1,4-cyclohexylene in which one or more non-adjacent CH.sub.2 groups is, in each case, replaced by --O-- or --S--,
- (b) 1,4-phenylene or 1,4-phenylene in which one or two CH groups are each replaced by N,
- (c) 1,4-cyclohexenylene, 1,4-bicyclo[2.2.2]-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or and 1,2,3,4-tetrahydronaphthalene-2,6-diyl,
- in which the radicals of (a) and (b) can, in each case, be substituted by CN or fluorine.
- 12. A compound according to claim 3, wherein said terminal structure --A.sup.2 --Q--CHF.sub.2 is attached to the remainder of the liquid crystal compound by group --A.sup.1 --Z.sup.1 --,
- wherein
- Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or a single bond; and
- A.sup.1 is
- (a) trans-1,4-cyclohexylene or trans-1,4-cyclohexylene in which one or more non-adjacent CH.sub.2 groups is, in each case, replaced by --O-- or --S--,
- (b) 1,4-phenylene or 1,4-phenylene in which one or two CH groups are each replaced by N,
- (c) 1,4-cyclohexenylene, 1,4-bicyclo[2.2.2]-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or and 1,2,3,4-tetrahydronaphthalene-2,6-diyl,
- in which the radicals of (a) and (b) may, in each case, be substituted by CN or fluorine.
- 13. A compound according to claim 10, wherein Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- or --OCH.sub.2 --.
- 14. A compound according to claim 12, wherein Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 -- or a single bond.
- 15. A compound according to claim 11, wherein A.sup.1 is 1,4-phenylene, trans-1,4-cyclohexylene, 1,4-cyclohexenylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl.
- 16. A compound according to claim 12, wherein A.sup.1 is 1,4-phenylene, trans-1,4-cyclohexylene, 1,4-cyclohexenylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl.
Priority Claims (7)
Number |
Date |
Country |
Kind |
37 32 284.2 |
Sep 1987 |
DEX |
|
38 25 425.5 |
Jul 1988 |
DEX |
|
39 09 802.8 |
Mar 1989 |
DEX |
|
39 29 526.5 |
Sep 1989 |
DEX |
|
39 29 525.7 |
Sep 1989 |
DEX |
|
39 29 764.0 |
Sep 1989 |
DEX |
|
40 09 907.5 |
Mar 1990 |
DEX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of Ser. No. 07/846,230, filed Mar. 6, 1992, now abandoned; a continuation-in-part of Ser. No. 07/623,385, now abandoned, filed Nov. 19, 1990; a continuation-in-part of Ser. No. 07/845,818, filed Mar. 9, 1992, now U.S. Pat. No. 5,389,292, which is a continuation of Ser. No. 07/424,219, now abandoned, filed Oct. 4, 1989; and a continuation-in-part of Ser. No. 07/803,787, filed Dec. 6, 1991, now abandoned which is a continuation of Ser. No. 07/362,438, filed May 24, 1989, now abandoned. The entire disclosures of all six of the above-mentioned applications are hereby incorporated by reference.
US Referenced Citations (31)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0193191 |
Sep 1986 |
EPX |
0387032 |
Sep 1990 |
EPX |
3511111 |
Oct 1986 |
DEX |
3906040 |
Sep 1989 |
DEX |
55-157523 |
Dec 1980 |
JPX |
58-18326 |
Feb 1983 |
JPX |
2162515 |
Feb 1986 |
GBX |
8808441 |
Nov 1988 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Titov et al., Mol. Cryst. Liq. Cryst., vol. 47, pp. 1-5 (1978). |
Rieger et al., "Bulk Resistivity of Liquid Crystals and their RC-Time Constant in Displays", Presentation No. 16 at Freiburger Arbeidstagung 1989, Conference Proceedings, Frieburg (1989). |
Finkenzeller et al., "Physical Properties of Liquid Crystals: III. Dielectric Permittivities." Liquid Crystal Newsletter 4, Merck (1989). |
Continuations (2)
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Date |
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Parent |
424219 |
Oct 1989 |
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Parent |
362438 |
May 1989 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
846230 |
Mar 1992 |
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