Liquid crystal compounds and method of preparation
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United States of America Patent
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Dec 16, 1986
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N/A
app pub date -
Mar 22, 1984
filing date -
Mar 22, 1983
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Expired
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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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