Liquid crystal compounds containing chiral 2-halo-2 methyl alkox

Details Liquid crystal compounds containing chiral 2-halo-2 methyl alkox Liquid crystal compounds containing chiral 2-halo-2 methyl alkox

1994-02-08

1995-09-26

Wu, Shean

Compositions

Liquid crystal compositions

25229961, 25229963, 544242, 544336, 546346, 548136, 568588, 568647, 570127, C09K 1952, C09K 1934, C07D23902, C07C 4300

Patent

active

054532183

ABSTRACT:
This invention provides chiral nonracemic compounds of formula ##STR1## wherein * indicates a chiral carbon, R.sub.1 and R.sub.2, independently of one another, can be an alkyl, alkenyl or alkynyl group wherein one or more non-neighboring CH.sub.2 groups can be replaced with an O, S or a silyl group (R.sub.A SiR.sub.B) wherein R.sub.A and R.sub.B, independently of one another, are alkyl or alkenyl having from one to six carbon atoms; R.sub.1 having from about 3 to 20 carbon atoms, and R.sub.2 having from 1 to about 18 carbon atoms; X is O, S, CO, COO, OCO, COS or a single bond where Ar is a liquid crystal core moiety having two or three aromatic rings of the formula

REFERENCES:
patent: 5051506 (1991-09-01), Wand et al.

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