Acetylenes

Details Acetylenes Acetylenes

1982-12-03

1985-07-09

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 25229961, 25229962, 25229963, 25229964, 25229965, 25229966, 25229967, 260464, 260465D, 260465F, 260465K, 350350R, 350350S, 544242, 544298, 549369, 549373, 560 1, 560 61, 560 72, 560 73, 560104, 560106, 568631, 568635, 568642, 585 20, 585 25, C07C 1328, C07C 1550, C07C 4321, C07C 6975, C07C12170, C07C 500, C07C 2524, C07C 6708, C07D31906, C07D23926, C07D23927, C07D23928, G02F 113, C09K 334

Patent

active

045281149

ABSTRACT:
Compounds of the formula ##STR1## wherein ring B stands for 1,4-phenylene or a trans-1,4-disubstituted cyclohexane ring and A stands for a group with 1 to 3 six-membered rings, which together with ring B represents a central group of formulae II-XIII; R.sup.1 signifies a straight-chain alkyl group containing 1 to 9 carbon atoms or when R.sup.1 is attached to a benzene, monofluorinated benzene or pyrimidine, ring R.sup.1 also signifies a straight-chain alkoxy group with 1 to 9 carbon atoms; and R.sup.2 signifies hydrogen, cyano or a straight-chain alkyl group containing 1 to 7 carbon atoms,
their manufacture, liquid crystalline mixtures which contain said compounds and their use for electro-optical purposes are described.
The compounds of formula I are especially valuable as components in liquid crystal mixtures and for the most part themselves have liquid crystalline properties.

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