Compounds of the formula ##STR1## wherein Z.sup.1 is a single covalent bond or --CH.sub.2 CH.sub.2 --, X.sup.1 is hydrogen, fluorine or chlorine and R.sup.1 is 1E-alkenyl with 2 to 12 carbon atoms, their preparation, liquid crystalline mixtures which contain these compounds and their use for electro-optical purposes.
该公式的化合物为 ##STR1##,其中Z.sup.1是单一共价键或--CH.sub.2 CH.sub.2 --,X.sup.1是氢、
氟或
氯,R.sup.1是1E-烯基,具有2到12个碳原子,它们的制备,液晶混合物包含这些化合物,以及它们用于电光目的的用途。