NEW MATERIAL:A compound expressed by the formula (R 1 is 1-18C alkyl; X is single bond, O, COO or CH 2 O, etc.; Z is COO or CH 2 O; A 1 and A 2 are H, F, Cl, CH 3 or CH 3 , etc.; R 2 is 1-16C alkyl; R 3 is H, F or CH 3 ; p and q are 0 or 1; * is position of asymmetric carbon).
EXAMPLE: (3R,1'R)-3-(1'-methylbutoxy) carbonyl-7-(4"-n-octyloxy)benzoyl oxycumarin.
USE: Used as a mixing component for a ferroelectric liquid crystal having excellent responsibility.
PREPARATION: For instance, 2,4-dihydroxybenzaldehyde is reacted with (R) malonic acid di-1-methyl butyl and reacted with 4-octyloxybenzoyl chloride, then subjected to catalytic hydrogenation using a platinum oxide catalyst to obtain (3RS,1'R)-3-(1'-methylbutoxy) carbonyl-7-(4''-n-octyloxy)benzoyl oxyhydrocumarin, thus resultant compound is treated with an optical resolution agent to afford the aimed compound expressed by the formula.