| abstract |
Disclosed is an optically active compound represented by the formula:n orn .wherein R * representsn n (k = 1 - 14, X 1 is direct bond or -0-, *C is an asymmetric carbon), R is linear alkyl, optically active monohalogenoalkyl or optically active alkyl with CH 3 branch, X is direct bond, -0-, -C0 2 - or -OCO-, Y is direct bond, -OCO-, -C0 2 -, -CH 2 0- or -OCH 2 -, A 1 andn n (B is H, halo or cyano), m = 0 or 1, n = 1 - 14, Z 1 is -C0 2 - or -CH 2 0-, and Z 2 is -CO 2 -, -CH 2 O- or -O-, with the proviso that when m = 0 in formula (2), A3 isn and when Y is direct bond and Z 2 is -0- in formula (2), combination of A3 and A4 is neither combination ofn nor combination ofn 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. |