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

1997-08-13

1998-09-22

Wu, Shean C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229962, 25229963, 549356, 549415, 549416, 549417, 549420, 556445, 556482, 556489, 544242, 544298, 544333, C09K 1934, C07D31500, C07D23902, C07F 704

Patent

active

058110283

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), Elderschink et al.
patent: 5595684 (1997-01-01), Namekawa et al.
patent: 5698137 (1997-12-01), Ishizuka 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. 1059-1-62, 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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