Aromatic esters and liquid crystal mixtures containing same

Abstract

Compounds of the general formula ##STR1## wherein R.sup.1 signifies alkyl or alkenyl with 1 to 12 and, respectively, 2 to 12 carbon atoms, which is unsubstituted or mono- or multiply-substituted with halogen and in which one methylene group can be replaced by --O--; R.sup.2 signifies alkyl or alkenyl with 1 to 12 and, respectively, 2 to 12 carbon atoms, which is unsubstituted or mono- or multiply-substituted with halogen and in which one or more methylene groups can be replaced by --O-- and/or --COO-- or --OOC--; Z.sup.1 signifies a single covalent bond or --CH.sub.2 CH.sub.2 --; A.sup.1, A.sup.2 each independently represent 1,4-phenylene, which is unsubstituted or mono- or multiply-substituted with halogen, or pyridine-2,5-diyl or pyrimidine-2,5-diyl; A.sup.3 represents 1,4-phenylene, which is unsubstituted or mono- or multiply-substituted with halogen, or pyridine-2,5-diyl, pyrimidine-2,5-diyl or trans-1,4-cyclohexylene; n is 0 or 1; with the proviso that at least one of rings A.sup.1, A.sup.2 or A.sup.3 signifies either pyridine-2,5-diyl or pyrimidine-2,5-diyl; and with the further proviso that, when n=0, R.sup.1 represents 1E-alkenyl and R.sup.2 represents alkyl, alkoxy or alkenyloxy, their manufacture and use in electro-optical devices as well as mixtures which contain said compounds are described in the present Application.

Dependencies are inferred from the claim text.