Cyclohexane derivatives

A liquid-crystal dielectric useful for electrooptical display elements and comprising at least two liquidcrystal components, wherein at least one of said components is a compound of the formula

• R.sup.1 --(A.sup.1).sub.m --Z.sup.1 --A--Z.sup.2 --(A.sup.2).sub.n --R.sup.2
• wherein
• R.sup.1 and R.sup.2 are each independently H;
• alkyl of 1-10 C atoms;
• alkyl of 1-10 C atoms in which one or two CH.sub.2 groups is optionally replaced by 0 atoms;
• F;
• Cl;
• Br;
• CN;
• or --O--COR;
• A.sup.1 and A.sup.2 are each independently 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, each of which is unsubstituted or substituted by 1-4 F atoms;
• A is 1,4-cyclohexylene which is substituted in the 1-position, the 4-position or the 1,4-positions by alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy, each of 1-5 C atoms, F, Cl, Br, CN or a combination thereof and which is optionally also substituted by 1 or 2 of F, Cl, Br or CN or a combination thereof;
• Z.sup.1 and Z.sup.2 are each independently --CO--O, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O or a single bond;
• R is alkyl of 1-5 C atoms;
• m is 1 or 2 and n is 0 or 1, wherein when m is 2, the two A.sup.1 groups are identical or different from one another;
• or an acid addition salt thereof for those compounds which are basic.