Optically active compound and liquid crystal composition contain

Details Optically active compound and liquid crystal composition contain Optically active compound and liquid crystal composition contain

1987-04-27

1989-03-28

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 2522995, 25229965, 25229966, 350350R, 350350S, 558252, 558257, 568 23, 568 25, 568 67, C09K 1952, C09K 1906, C09K 1912, C07C15207

Patent

active

048161780

ABSTRACT:
An optically active 4-alkylbenzenethiol and an optically active bis(4-alkylphenyl)disulfide represented by the formula: ##STR1## respectively, wherein R.sub.1 * and R.sub.2 * are respectively an alkyl group having 4-12 carbon atoms including an asymmetric carbon atom, may be prepared, e.g., through halogenation or sulfonation of an optically active alcohol, followed by reaction with a phenylmagnesium halide, chlorosulfonylation and reduction. The optically active thiol or disulfide is effective, e.g., in preventing occurrence of reverse domain when added to a nematic liquid crystal, and also can be bonded to an intermediate to provide a functional material including a mesomorphic compound represented by the formula: ##STR2## wherein R.sub.3 is an alkyl or alkoxy group having 1-18 carbon atoms, n is 1 or 2, and C* is an asymmetric carbon atom.

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Demus, D. et al., Flussige Kristalle in Tabellen II, VEB Deutscher Verlag fur Grundstoffindustrie, Leipzig, pp. 138-141, (1984).
Gray, G. W. et al., Liquid Crystals & Plastic Crystals, vol. 1, Ellis Horwood, Ltd., London, pp. 142-143, (1974).
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