| abstract |
New cyclohexane derivatives of the formula I R1-A1-Z1-A2-R2 I wherein R1 and R2 are each H, an unsubstituted or substituted alkyl group with 1-15 C atoms, it also being possible for one or two non-adjacent CH2 groups to be replaced by at least one grouping from the group comprising -O-, -CO-, -O-CO-, -CO-O-, -C 3BOND C-, -CH=CH-, -S-, -SO- and -SO2-, F, Cl, Br, CN or R3-(A3)p-Z2-, A1 is -A-, -A4-Z3-A- or -A-Z3-A4-, A is a 1,4-cyclohexylene group which is substituted in the 1- and/or 4-position by unsubstituted or substituted alkyl or fluorinated alkyl with in each case 1-5 C atoms, it also being possible for one or two non-adjacent CH2 groups to be replaced by one grouping from the group comprising -O-, -CO-, -O-CO-, -CO-O-, -C 3BOND C-, -CH=CH-, -S-, -SO- and -SO2-, or by F, Cl, Br, CN and/or -CHO, and which can carry 1 or 2 further substituents, A2, A3 and A4 in each case denote 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH3 groups and/or CN groups, it also being possible for one or two CH groups to be replaced by N atoms, 1,4-cyclohexylene, it also being possible for one or two non-adjacent CH2 groups to be replaced by O atoms, 1,4-cyclo-1-enyl, 1,3-dithiane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo(2,2,2)-octylene, unsubstituted or CN-substituted decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl or -A-, Z1, Z2 and Z3 each are -CO-O-, -O-CO-, -OCH2-, -CH2O-, -CH2CH2-, substituted ethylene or a single bond, R3 is H, an unsubstituted or substituted alkyl group with 1-15 C atoms, it also being possible for one or two non-adjacent CH2 groups to be replaced by a grouping from the group comprising -O-, -CO-, -O-CO-, -CO-O-, -C 3BOND C-, -CH=CH-, -S-, -SO- and -SO2-, F, Cl, Br or CN and p is 1 or 2, and, if p=2, the groups A3 can be identical or different, and the acid addition salts of the basic compounds of this type, are suitable for use as components of liquid crystal dielectrics. |