Liquid crystal compounds and method of preparation

Details Liquid crystal compounds and method of preparation Liquid crystal compounds and method of preparation

1984-03-22

1986-12-16

Gron, Teddy S.

Compositions

Radioactive compositions

Nuclear reactor fuel

25229966, 25229967, 25229968, 350333, 534566, 534572, G02F 113, C09K 334, C07C10500

Patent

active

046292900

ABSTRACT:
Asymmetric trans-4,4'-dialkyl-ONN-azoxybenzenes having the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are straight-chain alkyl groups having from 1 to 10 carbon atoms and R.sub.1 .noteq.R.sub.2 are provided. The azoxybenzene compounds are prepared by condensing corresponding P-alkylaniline ##STR2## and P-alkylnitrobenzene ##STR3## placing the reaction mixture into ammonium chloride and hydrolyzing to yield the asymmetrical azoxybenzene compound, corresponding asymmetrical azobenzene compound and asymmetric azobenzene compound. The asymmetric azoxy compound is then separated from the mixture by column chromotography and recrystallization. The asymmetric azoxybenzene compounds have a wide range of nematic liquid crystal temperature and are particularly well suited for liquid crystal compositions for use in matrix-addressing driving systems.

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