Optically active dihydropyran derivative, and liquid crystal com

Details Optically active dihydropyran derivative, and liquid crystal com Optically active dihydropyran derivative, and liquid crystal com

1996-04-15

1997-12-16

Chan, Nicky

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

549416, 549417, 549420, 549370, 5462821, 544238, 544239, 544318, 544333, 544405, 349182, C09K 1934, G02F 113, C07D30930, C07D30922

Patent

active

056981376

ABSTRACT:
A 2H-5,6-optically active dihydropyran derivative represented by the general formula (I) or (I'): ##STR1## wherein Rf represents a fluoroalkyl group having 1 or 2 carbon atoms; a liquid crystal composition and a liquid crystal device comprising the derivative; and a racemic mixture comprising at least one type of the derivative. The derivative is a novel compound which exhibits the liquid crystal property by itself or can be used as an excellent dopant providing a high speed response to a composition comprising it even when the compound does not exhibit the liquid crystal property by itself. The derivative also exhibits a large spontaneous polarization.

REFERENCES:
patent: 4818431 (1989-04-01), Eldenschiak et al.
patent: 5437814 (1995-08-01), Koden et al.
patent: 5443755 (1995-08-01), Namekawa et al.
patent: 5595684 (1997-01-01), Namekawa et al.
Patent Abstracts of Japan, vol. 17, No. 647 (C-1135), Dec. 2, 1993, JP-A-05 208969, Aug. 20, 1993.
Tetrahedron: Asymmetry, vol. 4, No. 5, pp. 1059-1062, Jan. 18, 1993, Takashi Yamazaki, et al., "Preparation of 6-Deoxy-6,6,6-Trifluro-D-Mannose and D-Allose From Enzymatically Resolved 2-Butenolides".

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