| abstract |
The invention relates to sulphur-oxide containing, liquid-crystalline compounds of the formula I R<1>-(A<1>)m-Z-(A<2>)n-R<2> in which the group Z is -(CH2)s-Z<2>-(CH2)t-, and, in this formula, the group Z<2> according to the invention is -SO-, -SO2-, -SO2-SO2-, -SO2-O-, -SO2-S-, -SO2-NR<4>. S and t can in each case assume values of 0, 1 or 2. Furthermore, R<1> and R<2> are in each case H, an alkyl group having 1-10 C atoms in which one or two non-adjacent CH2 groups can also be replaced by O-atoms, or are -COOR, -OCOR, F, Cl, Br, CN, SR, SOR, SO2R or R<3>-A<3>-Z<1>, where only R<1> or R<2> can be H or R<3>-A<3>-Z<1>-, R is an alkyl group having 1-10 C atoms, A<1>, A<2>, A<3> are in each case 1,4-phenylene groups which are unsubstituted or substituted by one or two F and/or Cl atoms and/or Br atoms and/or CH3 groups and/or CN groups, in which one or two =CH-groups can optionally be replaced by =N-, or are 1,4-cyclohexylene groups in which one or two non-adjacent CH2 groups can optionally be replaced by O, or are 1,3-dithiane-2,5-diyl, piperidine-1,4-diyl or 1,4-bicyclo(2,2,2)octylene groups, Z<1> is -COO-, -O-CO-, -CH2-CH2-, -OCH2-, -CH2O, Z or a single bond, R<3> is H, an alkyl group having 1-10 C atoms in which one or two non-adjacent CH2 groups can also be replaced by O atoms, or is F, Cl, Br, CN, -COOR, -OCOR, SR, SOR or SO2R, R<4> is H or an alkyl group having 1-5 ... Original abstract incomplete. |