CHIRAL OR ACHIRAL CYCLIC COMPOUNDS

摘要

Chiral or achiral cyclic compounds have the formula R1- (A1-Z1) m-A2-Q1-C * R ° CF3-X, in which R1 represents alkyl or perfluoralkyl which can be interrupted by O- and / or -CO- and / or -CO-O- and / or -CH = CH- and / or -CH halogen and / or -CHCN- and / or -O-CO-CH halogen and / or -CO-O-CHCN, F, Cl , Br, CN or -Q1-C * R ° CF3-X; A1 and A2 represent 1,4-phenylene unsubstituted or substituted by one or two F and / or CH3 and / or CN, where one or two CH groups can also be substituted by N; 1,4-cyclohexylene, where one or two non-adjacent CH2 groups can also be substituted by O and / or S; 1- (4-) cyano-1,4-cyclohexylene, piperidin-1,4-diyle, 1,4-bicyclo (2,2,2) -octylène, 1,3,4-thyadiazol-2,5-diyle , naphthalin-2,6-diyl, decahydronaphthalin-2,6-diyl or 1,2,3,4-tetrahydronaphthalin-2,6-diyl; Z1 represents -CO-O-, -O-CO, -CH2CH2-, -OCH2-, -CH2O-, -C = C- or a single bond; X represents H or CH3; C * is a carbon atom linked to four different substituents, m is 1, 2 or 3; Q1 represents -O-, -O-CO-, -CO-O- or a single bond when at least one of the cyclic compounds A1 and A2 represents 1,4-phenylene substituted by one or two atoms F or A1 represents 1, Unsubstituted 4-phenylene, where a CH group is substituted by N, or -O- (CH2) n-, -O-CO- (CH2) n- or -CO-O- (CH2) n, where n is equal 1, 2, 3 or 4; R ° represents alkyl different from X or, when Q is a single bond, alkoxy or alkanoyloxy. These compounds can be used as constituents of phases of smectic liquid crystals with chiral inclination.