Cholesteryl carbonates and carbamates of azo dyes

Details Cholesteryl carbonates and carbamates of azo dyes Cholesteryl carbonates and carbamates of azo dyes

1977-02-28

1979-01-16

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260207, C07C10706, C09B 4318

Patent

active

041348885

ABSTRACT:
Novel liquid crystal dyes of the formula ##STR1## wherein (CHOL--) is a cholesteryl radical, X can be 0 or NH, R.sub.1 can be H, --OH, methyl, fluoro or chloro; R.sub.2 can be --NO.sub.2, --CN, N-(alkyl).sub.2, --OCOOR, --OCOR, alkyl or alkoxy and R.sub.3 can be H, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.

REFERENCES:
patent: 3720658 (1973-03-01), Goldberg et al.
patent: 3984392 (1976-10-01), VAN DER Veen
patent: 4027950 (1977-06-01), Moriyama et al.
Lubs, The Chemistry of Synthetic Dyes and Pigments, Reinhold Publishing Corp., New York, 1955, pp. 670-671.

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