Liquid crystal dielectric

A liquid-crystal dielectric useful for electrooptical display elements comprising at least two liquid crystal components, wherein at least one component is a compound of the formula ##STR4## wherein G is H.sub.2 or .dbd.O;

• R.sup.1 and R.sup.2 each independently is alkyl of 1-10 C-atoms;
• alkyl of 1-10 C atoms wherein one or two non-adjacent CH.sub.2 groups are replaced by O atoms;
• F;
• Cl;
• Br;
• or CN;
• and R.sup.2 can also be H;
• A.sup.1 and A.sup.2 each independently is 1,4-phenylene, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or pyrimidine-2,5-diyl or one of these groups substituted by 1-4 F atoms;
• Z.sup.1 and Z.sup.2 each independently is --CO--O--, --O--CO--, CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, or a single bond;
• and
• m and n each is 0, 1, 2, or 3, but (m+n) is at least 1 and at most 3, it being possible, when m is 2 or 3, for the groups A.sup.1 and, when n is 2 or 3, for the groups A.sup.2 each to be identical or different from one another, with the proviso that when --(A.sup.2).sub.n --R.sup.2 is OR, wherein R is H or alkyl, Z.sup.1 and Z.sup.2 are single bonds, and G is H.sub.2, then R.sup.1 -(A.sup.1).sub.m -- is not 4-cyanophenyl, 4-alkylphenyl and 4-alkylcyclohexyl.