Cyano-alicyclic esters in liquid crystal compositions

Details Cyano-alicyclic esters in liquid crystal compositions Cyano-alicyclic esters in liquid crystal compositions

1992-05-01

1993-08-03

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229966, 25229967, 359104, 558426, C09K 1930, C09K 1912, C09K 1920, C07C25500

Patent

active

052326250

ABSTRACT:
Compounds suitable for use as constituents of ferroelectric smectic liquid crystal compositions, which are esters of formula (I), where R.sub.2 and R.sub.3 together represent the residue of an alicyclic hydrocarbon ring system where .degree.C. is an asymmetric carbon atom and X is a chain of up to three linked aromatic or alicyclic six-membered organic cyclic groups, laterally and/or terminally substituted. Preferred compounds have a formula (II), where R.sub.1 is alkyl or alkoxy, A, B, and D are phenyl, fluoro or chloro substituted phenyl or cyclohexyl, n is 0 or 1, Y is a bond or CH.sub.2 CH.sub.2 if n is 0, or a bond CH.sub.2 CH.sub.2 COO or COO if n is 1. Preferred groups C(CN)R.sub.2 R.sub.3 are formula (III) and (IV).

REFERENCES:
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patent: 4693841 (1987-09-01), Hittich et al.
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patent: 4784793 (1988-11-01), Coates et al.
patent: 4830470 (1989-05-01), Buchecker et al.
patent: 4886620 (1989-12-01), Hopt et al.
patent: 5002694 (1991-03-01), Wachtler et al.
patent: 5180521 (1993-01-01), Eidenschink et al.

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