Liquid crystal compounds

摘要

(R)- and (S)-enantiomer composition represented by the formula (I) having sufficient high optical purity for exhibiting optically tristable states in S*(3) phase; <IMAGE> (I) wherein Ra means a C5-C14 alkyl group or a C5-C14 alkoxy group, preferably a C5-C14 alkyl group, Rb means a C4-C12 normal alkyl group or a C4-C12 branched alkyl group, X means a <IMAGE> group or a <IMAGE> group, Z means a fluorine containing alkyl group, preferably a trifluoromethyl group and * shows an optically active carbon.