The liquid crystal component null which becomes optical activity ester compound, the manufacturing method, making use of the liquid crystal constituent which designates that as the active ingredient and

摘要

NEW MATERIAL:Optically active ester compounds of formula I (R1 is 3-20C alkyl; R2 is 1-20C alkyl group which may be substituted with halogen atom or 2-20C alkoxyalkyl group which may be substituted with halogen atom; X is -O-, -COO- or -OCO-; K is 0 or 1; m is 1 or 2; n is 1-6; * mark shows asymmetric carbon atom). EXAMPLE:(-)-4-Decyloxybenzoic acid 4-(3-propoxycarbonylbutyl)phenyl ester. USE:Useful as a ferroelectric liquid crystal material having a sufficient spontaneous polarization, capable of rapid response and showing a ferroelectric liquid crystal phase in a temperature range in the vicinity of the room temperatures. Useful as a liquid crystal composition and as a liquid crystal element using said composition. PREPARATION:An optically active phenol derivative of formula II is reacted with a carboxylic acid of formula III (R' is hydroxyl group or halogen atom) to obtain the objective compound of formula I.