| abstract |
(57) [Summary] [Objective] To find a novel liquid crystalline compound having a relatively low viscosity and an extremely high dielectric anisotropy, which is suitable as a component of a liquid crystal medium for an electro-optical display. A cyanophenylpyridine or cyanophenylpyrimidine of formula I below is selected: Provided that in the above formula I, R 1 is an unsubstituted, or at least mono-substituted with halogen, alkyl, alkoxy or alkenyl group having 1 to 15 carbon atoms, one of these radicals being More CH 2 The groups are each independently -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, or , Each oxygen atom may be replaced so as not to be directly bonded to each other, X 1 , Y 1 and Z 1 each independently represent N or CF, and X 2 , Y 2 and Z 2 are each other. Independently represents N, CF or CH, and n is 1 or 2, where X 1 , Y 1 and Z 1 At least one of the groups in is N. |