| abstract |
(57) [Summary] (Modified) [PROBLEMS] To provide a liquid crystal compound for a display system using a liquid crystal material having a negative dielectric anisotropy and a composition containing the same. SOLUTION: The liquid crystal compound of the general formula 1. (R 1 and R 2 independently represent a C1-15 alkyl group; Any non-adjacent methylene in the group is oxygen, sulfur, -C H = CH— or —C≡C— and any hydrogen may be replaced by fluorine. Rings A 1 and A 2 are independently trans-1,4-cyclohexylene, 1,4-cyclohexenylene, trans-1,4-silacyclohexylene, 4-phenylene, 2,3-difluoro-1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, pyrimidine-2,5-diyl, pyridine-2,5- diyl, etc., X is -CH 2 S-, —SCH 2 —, —CF 2 S— or —SCF 2 —, m is 0 Or 1. ) |