| abstract |
A compound of the formula ##STR1## wherein R is C 1 -C 7 alkyl or C 2 -C 12 alkenyl; rings A and B each independently are 1,4-phenylene, n trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl; n Z 1 is a single bond or --CH 2 CH 2 --; and n Z 2 is a single bond, --CH 2 CH 2 --, --OCH 2 --, n --C.tbd.C--, --COO-- or --OOC--; and n m, n are 0 or 1, with the proviso that m+n≦1; n as well as liquid crystalline mixtures which contain such compounds and the use of such compounds and, respectively, mixtures for electro-optical display devices. |