| abstract |
Carbocyclic compounds of the formula I ##STR1## wherein Q is a benzene or cyclohexane ring or a naphthalene system, n X is in each case --CH 2 --(CH 2 ) p -- wherein it is also possible for one or two non-adjacent CH 2 groups to be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O-- or --CH═CH--, n p is 0, 1 or 2, n A 1 and A 2 independently of one another are each a 1,4-phenylene group which is unsubstituted or monosubstituted or polysubstituted by halogen atoms and/or CH 3 groups and/or CN groups and in which it would also be possible for one or more CH groups to be replaced by N atoms, a 1,4-cyclohexylene group wherein it would also be possible for one or two non-adjacent CH 2 groups to be replaced by --O-- and/or --S--, a piperidine-1,4-diyl group or a 1,4-bicyclo[2.2.2]octylene group, n Z is --CO--O--, --O--CO--, --O--, --CH 2 --, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 --, --CHCN--CH 2 --, --CH 2 --CHCN--, --CH═CH--, --CH═N--, --N═CH--, --NO═N--, --N═NO-- or a single bond, n n is 0, 1 or 2 and n R is alkyl having 1 to 20 C atoms wherein it would also be possible for one or more non-adjacent CH 2 groups to be replaced by --O--, --CO--, --O--CO--, --CO--O-- or --CH═CH--, H, F, Cl, Br, I, OH, NH 2 , COOH or CN, n m being 6 in the event that Q=benzene or cyclohexane and being 8 in the event that Q=naphthalene, subject to the proviso that, in the event that X=--OCH 2 -- and --(A 1 --Z) n --A 2 --R=p-alkoxyphenyl, Q is a cyclohexane ring, are suitable for use as components of discotic, liquid-crystal phases. |