CHIRAL OR ACHIRAL CYCLIC COMPOUNDS

摘要

Chiral or achiral cyclic compounds of formula (I): R?1-(A1-Z1)¿m-A2-Q1-C*R°X-Q?2-(A3-Z2)¿n-(A4)o-R2, in which R?1 and R2¿, independently of one another, represent an alkyl or perfluoralkyl group with 1 to 12 C atoms, in which also one or two non-adjacent CH¿2? or CF2 groups can be replaced by O atoms and/or -CO- groups and/or -CO-O- groups and/or -CH=CH- groups and/or -CHhalogen- and/or -CHCN- groups and/or -O-CO-CHhalogen- and/or -CO-O-CHCN- groups; one of the groups R?1 and R2¿ also represents H, F, Cl, Br or CN, R1 is also -Q1-C*R°X-Q2-R2, whereby Q1, R°, X, Q?2 and R2¿ have the same notations; A?1, A2, A3 and A4¿, independently of each other, represent an unsubstituted 1,4 phenylene or substituted by one or two F and/or Cl atoms and/or CH¿3? groups and/or CN groups, wherein also one or two CH groups can be replaced by N; 1,4-cyclohexylene, wherein also one or two non-adjacent CH2 groups can be replaced by O atoms and/or S atoms; piperidine-1,4-diyl, 1,4-bicyclo(2,2,2)octylene-, 1,3,4-thiadiazol-2,5-diyl, naphthalene-2,6-diyl-, decahydronaphthalene-2,6-diyl- or 1,2,3,4-tetrahydronaphthalene-2,6-diyl-; Z?1 and Z2¿ are individually -CO-O-, -O-CO-, -CH¿2?CH2-, -OCH2-, -CH2O-, -C=C- or a simple bond; X is halogen, CN or CH3, R° is an alkyl group different from X (and where n= o= 0 also from R?2¿); C* is a carbon atom combined with four different substituents; m and n each, independently of one another, are 0, 1, 2 or 3; o is 0 or 1; (m + n + o) is 1, 2, 3 or 4; and Q?1 and Q2¿, each independently of one another, are alkylene with 1 to 4 C atoms, where also a CH¿2? group can be replaced by -O-, -S-, -CO-, -O-CO-, -CO-O-, -S-CO-, -CO-S-, -CH=CH-COO-, -CH=CH-, -CHhalogen- and/or -CHCN-, or a simple bond. These compounds can be used as constituents of chirally tilted smectic liquid crystal phases.