Liquid crystal compounds

Details Liquid crystal compounds Liquid crystal compounds

1994-03-08

1995-09-05

Wu, Shean

Compositions

Liquid crystal compositions

25229961, 25229963, 25229966, 544298, 544335, 546339, 546346, 549369, 549374, 570127, C09K 1952, C09K 1934, C07D23902, C07D31906

Patent

active

054476577

ABSTRACT:
The present invention provides compounds of the general formula: ##STR1## wherein R is an alkyl group with 1 to 12 carbon atoms or a group of the formula ##STR2## Ring A.sup.1 is 1,4-phenylene, which is unsubstituted or substituted with fluorine, pyridine-2,5-diyl or pyrimidine-2,5-diyl;

REFERENCES:
patent: 5068053 (1991-11-01), Reiffenrath et al.
patent: 5164114 (1992-11-01), Kurmeier et al.
patent: 5178790 (1993-01-01), Weber et al.
patent: 5194178 (1993-03-01), Coates et al.
Adomenas et al., "Acetylenic liquid crystals available by Castro reaction", Chemical Abstracts, vol. 95:219871e, p. 494 (1981).
Derwent Abstract 89/138421/19 (1989) for DE 3 734 517.

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