| abstract |
Optically active compounds of the formula I ##STR1## where R is C 1 -C 12 -alkyl or -perfluoroalkyl in which one or two non-adjacent CH 2 or CF 2 groups can also be replaced by --O-- and/or --CO-- and/or --CO--O-- and/or --CH═CH-- and/or --CH-halogen-- and/or --CHCN-- and/or --0--CO--CH-halogen-- and/or --O--CO--CHCN--, or is C 1 -C 12 -alkyl which can have a terminal chemically reactive group and in which a CH 2 group can be replaced by --O--, n A 1 and A 2 are each, independently of one another, 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl and/or Br atoms and/or CH 3 groups and/or CN groups and in which one or two CH groups can also be replaced by N, 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups can also be replaced by --O-- and/or --S--, 1,4-piperidinediyl, 1,4-bicyclo[2.2.2]octylene, 2,6-naphthalenediyl, decahydro-2,6-naphthalenediyl or 1,2,3,4-tetrahydro-2,6-naphthalenediyl, n A 3 is unsubstituted or substituted phenyl, n Z is --CO--O--, --O--CO--, --CH 2 CH 2 --, --OCH 2 --, --CH 2 O--, --C.tbd.C-- or a single bond and n m is 0, 1, 2 or 3. |