Optically active benzene derivatives, process for producing the same and liquid-crystalline composition containing said derivatives as liquid-crystalline compound and light switching elements

摘要

Disclosed are herein optically active benzene derivatives represented by the formula (I): <IMAGE> (I) preparation processes therefor, liquid crystal composition containing such benzene derivatives as liquid-crystalline compound, and a light switching element using said liquid crystal composition as liquid crystal element, wherein R1, R2, x, y, z, m, p and s are as defined in the specification.