2,3-dicyano-5-substituted pyrazines

Details 2,3-dicyano-5-substituted pyrazines 2,3-dicyano-5-substituted pyrazines

1984-08-17

1986-06-03

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 350346, 350350R, 544336, 544408, C09K 334, G02F 113, C09D24100, C09D24102

Patent

active

045928576

ABSTRACT:
Novel liquid crystal compounds having a positive dielectric anisotropy and liquid crystal compositions containing the same are provided, which liquid crystal compounds are 2,3-dicyano-5-substituted pyrazines expressed by the general formula ##STR1## wherein n represents 0 or 1; X represents R, ##STR2## in the case of n=0 and R, ##STR3## in the case of n=1; and R represents a linear chain alkyl group or an alkoxy group, each of 1 to 10 carbon atoms, and which liquid crystal compositions, when sealed in a TN cell, make it possible to operate the cell under a low threshold voltage and in a small consumption of electric power.

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Osman, M., et al., Mol. Cryst. Liq. Cryst., vol. 82 (Lett.), pp. 331-338 (1983).
"Synthesis of New Pyrazine Compounds from Diaminomaleonitrile" Chemical Abstracts, 89:163542e, Tsuda et al. (1978).
"Synthesis and Mesomorphic Properties of Diphenyl- and Biphenylylpyrimidines", Zeitschrift fur Naturforschung, 33B, 433-438 (1978), Boller et al.

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