Esters of 4-[2,2-dicyano-ethenyl]-phenols

Details Esters of 4-[2,2-dicyano-ethenyl]-phenols Esters of 4-[2,2-dicyano-ethenyl]-phenols

1980-10-03

1982-12-14

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260465D, 25229963, 25229967, C07C12170, C09K 334

Patent

active

043637671

ABSTRACT:
The invention relates to liquid-crystalline nematic mixtures which are used in electro-optical components, as well as to methods for their preparation.
The object of the invention is liquid-crystalline mixtures for electro-optical arrangements possessing high positive electrical anisotropy at a high clarification point, as well as methods for their preparation.
According to the invention, liquid-crystalline nematic mixtures are used, wherein at least one component is a 1,4-disubstituted benzene derivative and the other compound is an ester of 4-[2,2-dicyano-ethenyl]-phenol of the general formula ##STR1## wherein R.sup.1 denotes added groups of various characters such as alkyl or alkoxy for example, X is aromatic, cycloaliphatic or a heterocyclic ring system such as phenyl or cyclohexyl for example; and Y is a connector such as carbonyloxy, azomethine, azoxy.
These are prepared by reaction with reactive acid derivatives, particularly acid chlorides, or by a Knoevenagel-condensation by reacting respective 4-subst.-benzoic acid-[4-formyl-phenyl esters] or 4-alkyl-cyclohexanecarboxylic acid-[4-formyl-phenyl esters] with malonic acid dinitrile.

REFERENCES:
patent: 4147655 (1979-04-01), Dubois et al.

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