DIPHENYLYLETHANES AND LIQUID CRYSTALLINE PHASE

摘要

Diphenylylethanes of formula (I), in which one of the residues R<1> and R<2> denotes X and the other residue R<1> or R<2> denotes R-Y-, where X denotes H, halogen, -CF3, -OCHF2, -OCF3, -CN, -NCS or -NO2, R denotes alkyl, fluoralkyl, alkenyl or oxaalkyl, Y denotes O, S, -CO-O-, -O-CO-, -O-CO-O-, a single bond or, if m = 1, also trans-1,4-cyclohexylene or (II), m = 1 or 2, Ph denotes identical or different residues chosen from the group consisting of 1,4-phenylene, 2-fluor-1,4-phenylene, 3-fluor-1,4-phenylene and 3,5-difluor-1,4-phenylene, L<3> and L<4> each denote H, or one of these residues denotes F, L<1>, L<2> and L<5> each denote H or F, provided that in the case where X = CN or R<1> = -NCS, Y denotes 1,4-cyclohexylene or (II), and/or m = 2 and/or one of the residues L<1>, L<2> and L<3> denotes fluorine and/or denotes Ph-Cn-2-fluor-4-cyanphenyl or 3,5-difluor-4-cyanphenyl, are suitable as components of liquid crystalline phases.