Synthesis and mesomorphic properties of some 3-substituted-4-cyanophenyl esters, 4′-cyano-3-substituted-4-biphenyl esters of 4-(trans-4-alkylcyclohexyl) benzoic, 4-alkyl-3-substituted biphenyl-4′-carboxylic, trans-4-alkylcyclohexanecarboxylic and 4-alkylbenzoic acids and electrooptic parameters of liquid-crystalline mixtures containing these compounds

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Abstract
The reaction of trans-4-alkylcyclohexanecarboxylic acid chlorides, 4-alkylbenzoic, 4-(trans-4-alkylcyclohexyl)-benzoic, 4-alkyl-3-substituted biphenyl-4′-carboxylic acids (I) with 4-hydroxy-3′-substituted benzonitriles (IIa-d) and 4-hydroxy-3′-substituted-4′-cyanobiphenyls (IIe and g) has produced the corresponding esters (IIIa-v). The mesomorphic properties of the esters and electrooptic and dynamic parameters of the mixtures containing these compound have been studied. It has been shown that the liquid-crystalline mixtures containing 4-cyano-3-substituted-4′-biphenyl esters of 4-alkylbenzoic and trans-4-alkylcyclohexanecarboxylic acids have higher threshold voltages and saturation voltages in comparison with the analogous mixtures containing 4-cyano-3-substituted phenyl esters of 4-(trans-4-alkylcyclohexyl)benzoic acids.