Compounds of the formula ##STR1## wherein ring B stands for 1,4-phenylene or a trans-1,4-disubstituted cyclohexane ring and A stands for a group with 1 to 3 six-membered rings, which together with ring B represents a central group of formulae II-XIII; R.sup.1 signifies a straight-chain alkyl group containing 1 to 9 carbon atoms or when R.sup.1 is attached to a benzene, monofluorinated benzene or pyrimidine, ring R.sup.1 also signifies a straight-chain alkoxy group with 1 to 9 carbon atoms; and R.sup.2 signifies hydrogen, cyano or a straight-chain alkyl group containing 1 to 7 carbon atoms, their manufacture, liquid crystalline mixtures which contain said compounds and their use for electro-optical purposes are described. The compounds of formula I are especially valuable as components in liquid crystal mixtures and for the most part themselves have liquid crystalline properties.
本发明涉及化合物的配方##STR1##其中环B代表1,4-苯基或反-1,4-二取代
环己烷环,A代表一个含有1至3个六元环的基团,与环B一起表示公式II-XIII的中心基团; R.sup.1表示直链烷基,含有1至9个碳原子,或当R.sup.1连接到苯,单
氟苯或
嘧啶时,环R.sup.1也表示直链烷氧基,含有1至9个碳原子; R.sup.2表示氢,
氰或直链烷基,含有1至7个碳原子,描述了它们的制造方法,液晶混合物包含上述化合物及其用于电光目的的使用。公式I的化合物特别有价值作为液晶混合物中的组分,并且它们本身大多具有液晶性质。