CHIRAL ESTERS OF MESOGENIC-CARBOXYLIC ACIDS, PROCESS FOR THEIR PREPARATION AND THEIR USE AS DOPING AGENTS IN LIQUID CRYSTAL PHASES

摘要

1. An ester of a chiral alcohol and a mesogenic carboxylic acid, which is of the general formula (I) see diagramm : EP0217240,P6,F2 in which the symbols have the following meanings : n denotes 0 or 1, R**1 denotes a straight-chain or branched (C1 -C4 )alkyl which is substituted by halogen, in particular fluorine, R**2 denotes unsubstituted or substituted (C6 -C18 ) aryl, cyclo (C5 -C12 )alkyl or mononuclear or binuclear heteroaryl possessing a five-membered and/or sixmembered ring, and MC denotes R**3 -(A**1 -)n1 (B-)n2 (A**2 -)n3 CO where n = 0 or denotes OC-(A**1 -)n1 (B-)n2 (A**2 -)n3 CO where n = 1, R**3 denotes a straight-chain (C4 -C10 )alkyl in which a CH2 group can be replaced by an 0 atom, A**1 , A**2 independently of one another denote unsubstituted 1,4-phenylene or 1-4-cyclohexylene, B denotes CO-0 or 0-CO, n1 denotes 1 n2 denotes 0 or 1 and n3 denotes 1 or 2.