NEW MATERIAL:The compound of formulaI(R is 1-15C alkyl). EXAMPLE:trans-4-(trans-4'-Ethylcyclohexyl)cyclohexanecarboxylic acid 2-cyanonyl ester. USE:A liquid crystal composition having negative dielectric anisotropy, and usable in a guest-host-type display element. PROCESS:The compound of formulaIcan be prepared by (1) reacting trans-4- (trans-4'-alkylcyclohexyl)cyclohexanecarboxylic acid of formula II with thionyl chloride, and (2) reacting the resultant acid chloride of formula III with 2-cyanophenol of formula IV in the presence of pyridine.
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