Optically active 4-mercaptocinnamic acid derivatives, preparatio

Details Optically active 4-mercaptocinnamic acid derivatives, preparatio Optically active 4-mercaptocinnamic acid derivatives, preparatio

1993-07-12

1994-05-03

Wu, Shean

Compositions

Liquid crystal compositions

2522996, 558252, 558255, 558257, 359104, C09K 1952, C09K 1906, C07C32716, G02F 113

Patent

active

053085361

ABSTRACT:
An optically active 4-mercaptocinnamic acid derivative represented by general formula (1) ##STR1## wherein R.sup.1 represents an alkyl group, an alkoxy group alkylthio group having 6 to 14 carbon atoms; X is H or F; Y is H or CH.sub.3 ; n is 0 or 1; Z is CH.sub.3 or CF.sub.3 ; and R.sup.2 represents a C.sub.2-8 alkyl group, preparation method, bistable or tristable liquid crystal composition containing at least one such derivative, and a liquid crystal display device including such a liquid crystal composition.
The compound of general formula (1) decreases liquid crystal temperature range and broadens it, and enables realizing a bistable or tristable chiral smectic phase. The compound can be used alone or as blended with other liquid crystals having a smectic phase or ferroelectric liquid crystals as a material for liquid crystal devices.

REFERENCES:
patent: 4751018 (1988-06-01), Nakauchi et al.
patent: 5068054 (1991-11-01), Betterton et al.
patent: 5210267 (1993-05-01), Chun et al.

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