| abstract |
The present invention relates to compounds of the general formula <IMAGE> wherein R: alkyl or alkenyl having at most 12 carbon atoms; Rings A and B: independently of one another 1,4-phenylene, trans-1,4-cyclo-hexylene or trans-1,3-dioxane-2,5-diyl; Z <1>: a single bond or -CH2CH2-; and; Z <2>: denotes a single bond, -CH2CH2-, -OCH2-, -C ^ C-, -COO- or -OOC-; and; m, n: 0 or 1, with the proviso that m + n <= 1; as well as liquid crystalline mixtures containing such compounds and the use of such compounds or mixtures for electro-optical display devices. |