| abstract |
PCT No. PCT/EP86/00722 Sec. 371 Date Aug. 11, 1987 Sec. 102(e) Date Aug. 11, 1987 PCT Filed Dec. 8, 1986 PCT Pub. No. WO87/03581 PCT Pub. Date Jun. 18, 1987.Dispirotetradecanes of the formula I <IMAGE> I wherein R1 and R2 are each independently of each other alkyl containing 1 to 12 carbon atoms wherein one or more non-adjacent CH2 groups may also be replaced by -O-, -CO-, -CO-O-, -O-CO-, -O-COO- and/or -CH=CH- (trans), one of the radicals R1 and R2 also being H, F, Cl, Br, I, CN, NO2, NCS, A1 and A2 are each independently of each other trans-1,4-cyclohexylene wherein one or two non-adjacent CH2 groups may be replaced by -O- and/or -S-, or 1,4-phenylene wherein one or more CH groups may also be replaced by N, with it also being possible optionally for A1 and A2 to be substituted laterally or axially by F, Cl, CN, CH3, Z1 and Z2 are each independently of each other -C-O-, -O-CO-, -CH2CH2-, -CH2O-, -OCH2- or a single bond, m and n are each 0, 1 or 2, (m+n) 0, 1 or 2, X1, X2, X3 and X4 are each independently of each other H, F, Cl or CN, and one or both of the groups CX1X2 and CX3X4 may also be C=O, may be used as components of liquid-crystalline phases. |