Liquid crystal cyanoalkanes and cyanoalkenes

摘要

There is disclosed a cyanoalkane and cyanoalkene of general formula (I) which shows liquid crystalline properties: wherein R and R1 are independently C1-12 alkyl, alkoxy, perfluoroalkyl or perfluoroalkoxy; rings A, B, C and D are independently phenyl, which may carry one or two halogen substituents, trans-cyclohexyl, or (2, 2, 2) bicyclooctyl, each of a, b, c or d being independently 0 or 1 provided (a+b+c+d) is 2 or 3; links A and C are independently a single bond, CH2CH2, COO, OOC, CH2O or OCH2; n, m and p are independently 0 or an integer 1 to 4 provided (n+m+p) is not 0; W and Z are independently selected -CH=C(CN)- and -C(CN)=CH-; X and Y are independently selected from -CHCN- and -C(CN)2-; w, x, y and z are 0 or 1, provided that w and z are 0 if x and/or y are 1, and further provided that at least one of w, x, y and z is 1.