| 摘要 |
Dienes of the formula I <IMAGE> I in which n is 0, 1, 2, 3, 4 or 5, r is 1, 2 or 3, s is 1 or 2, <IMAGE> is trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl, <IMAGE> is trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, unfluorinated or mono- or polyfluorinated 1,4-phenylene, in which one or two CH groups may also be replaced by N, or the central part <IMAGE> <IMAGE> <IMAGE> Z is a single bond, a bridging member selected from the group consisting of -CH2CH2-, -CH=CH-, -C 3BOND C-, -CO-O-, -CH2O-, -OCH2- and -O-CO-, or any desired combination of two such bridging members, where two O atoms are not linked directly to one another, and R is -CN, -NCS, halogen or an alkyl, alkenyl, alkoxy or alkenyloxy group, in each case having up to 12 carbon atoms and in each case unsubstituted or monosubstituted or polysubstituted by fluorine and/or chlorine.
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