Phenanthrene derivatives and their use in liquid-crystalline mix

Details Phenanthrene derivatives and their use in liquid-crystalline mix Phenanthrene derivatives and their use in liquid-crystalline mix

1995-01-13

1997-07-15

Kelly, Cynthia Harris

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229961, 25229963, 544298, 544224, 546339, 546195, 568647, 560 65, C09K 1932, C09K 1934, C07D23902, C07D21170

Patent

active

056480210

ABSTRACT:
This invention relates to novel phenanthrene derivatives of the formula (I) which are particularly suitable for use in liquid-crystal mixtures. The compounds of formula (I) have a broad range of applications. Depending on the choice of substituents, they can be used as base materials from which liquid-crystalline phases are predominantly composed. They can also be added to liquid-crystalline base materials to modify the dielectric and/or optical anisotropy of a dielectric and to optimize its threshold voltage or viscosity. Liquid-crystalline mixtures containing compounds of formula (I) are particularly suitable for use in electrooptical switching and display devices.

REFERENCES:
English Abstract of DE 4300435 published Jan. 17, 1992.
English Abstract of DE 3827046 published Aug. 10, 1988.
Chemical Abstract, vol. 82, 1975, Ref: 67566a.
Datenbank STN-CA, 1-50u. 1-91, On-Line-Ausdruck.
Chemistry and Industry, Aug. 3, 1974, pp. 615-616.
Tetrahedron, vol. 37, No. 16, 1981, pp. 2815-2821. This foreign language references contains an English language abstract on p. 2815.
English language abstract of Nippon Kagaku Kaishi, 1980, pp. 250-253.
J. Chemical Soc., Perkin 11, 1982, pp. 465-472.
J. Chemical Soc., 1958, pp. 552-555.
Pramana, Suppl. No. 1, 1975, pp. 397-414.

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