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Abstract
some series of trans-1-(4-substituted phenyl)-2-(trans-4-n-alkylcyclohexyl) ethylenes, which show nematic phases, were prepared. Their transition temperatues, birefringenes and bulk viscosities were measured. Their properties are compared with those of other nematic cyclohexanes: phenyl cyclohexane carboxylates, phenyl thiol cycloheaxne carboxylates and phenyl cycloheanes. The phenyl cyclohexayl ethylens have wide nematic ranges wioth high clearning points and have high birefringences. Their photochemical stabilities were tested.