Optical active compound and liquid crystal composition.

摘要

Disclosed is an optically active compound represented by the formula: <CHEM> (k = 1 - 14, X1 is direct bond or -O-, *C is an asymmetric carbon), R is linear alkyl, optically active monohalogenoalkyl or optically active alkyl with CH3 branch, X is direct bond, -O-, -CO2- or -OCO-, Y is direct bond, -OCO-, -CO2-, -CH2O- or -OCH2-, A1 and <CHEM> (B is H, halo or cyano), m = 0 or 1, n = 1 - 14, Z1 is -CO2- or -CH2O-, and Z2 is -CO2-, -CH2O- or -O-, with the proviso that when m = 0 in formula (2), A3 is <CHEM> and when Y is direct bond and Z2 is -O- in formula (2), combination of A3 and A4 is neither combination of <CHEM> This compound is used as a ferroelectric liquid crystal or an additive to be incorporated with a ferroelectric liquid crystal or a non-ferroelectric liquid crystal of SmC phase.