Cyclohexane derivatives

Abstract

Cyclohexane derivatives of the formula I R.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --R.sup.2 I wherein R.sup.1 and R.sup.2 are each H or an alkyl group which has 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-groups, and/or --CO--O-- groups and/or --CH.dbd.CH-- groups, or are F, Cl, Br, CN or R.sup.3 --A.sup.3 --Z.sup.2 --, A.sup.1 is --A--, A.sup.4 --Z.sup.o --A-- or --A--Z.sup.o --A.sup.4 --, A is a trans-1,4-cyclohexylene or 1,4-cyclohexenylene group which is unsubstituted or is monosubstituted or polysubstituted in the 2-, 3-, 5- and/or 6-position by F and/or Cl and/or Br and/or CN and/or an alkyl group or a fluorinated alkyl group each of which has 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups, which trans-1,4-cyclohexylene or 1,4-cyclohexenylene group can optionally also be substituted in the 1-position and/or 4-position and one or two CH.sub.2 groups therein are replaced by --CO--, or R.sup.1 --A.sup.1 -- is a cyclohexyl group which is substituted in the 3-position by an alkyl group which has 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups and/or --CH.dbd.CH-- groups, or is substituted in the 3-position by CN, in which cyclohexyl group one or two nonadjacent CH.sub.2 groups can also be replaced by --O-- or --CO--, A.sup.2, A.sup.3 and A.sup.4 are each 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 groups and/or CN groups and in which one or two CH groups can also be replaced by N atoms and/or NO, or are 1,4-cyclohexylene wherein one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms, or are 1,3-dithiane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo(2,2,2)-octylene, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl groups or are --A--, Z.sup.o, Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, -- CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --CH.sub.2 CO--, --COCH.sub.2 --, --CH.sub.2 CHCN--, --CHCNCH.sub.2 -- or a single bond, and R.sup.3 is H or an alkyl group which has 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups and/or --CH.dbd.CH-- groups, or is F, Cl, Br or CN, are suitable for use as components of liquid-crystal phases.

Dependencies are inferred from the claim text.