申请人:Hoffmann-La Roche Inc.
公开号:US04391731A1
公开(公告)日:1983-07-05
Compounds of the formula ##STR1## wherein ring A is saturated or aromatic and a saturated ring A which may be present is trans-linked with the second ring; R.sup.1 is a straight-chain alkyl or alkoxy group containing 1 to 11 carbon atoms; R.sup.2 is cyano, a straight-chain alkyl group containing 1 to 11 carbon atoms, an ester group of the formula ##STR2## or, when ring A is saturated, additionally a straight-chain alkoxy group containing 1 to 11 carbon atoms; in the ester group of formula II ring B is either aromatic and X is oxygen or sulfur and R.sup.3 is cyano or a straight-chain alkyl or alkoxy group containing 1 to 10 carbon atoms, or ring B is a trans-1,4-disubstituted cyclohexane ring and X is oxygen and R.sup.3 is cyano or a straight-chain alkyl group containing 1 to 10 carbon atoms; and the total number of carbon atoms in the alkyl and/or alkoxy groups amounts to at most 12, are described. The compounds of formula I are useful in liquid crystal mixtures.
式为##STR1##的化合物,其中环A是饱和的或芳香的,可能存在的饱和环A与第二环是反式连接的;R.sup.1是含有1至11个碳原子的直链烷基或烷氧基;R.sup.2是氰基、含有1至11个碳原子的直链烷基、式为##STR2##的酯基,或者当环A是饱和的时,另外还是含有1至11个碳原子的直链烷氧基;在式II的酯基中,环B可以是芳香的,X是氧或硫,R.sup.3是氰基或含有1至10个碳原子的直链烷基或烷氧基;或者环B是反式1,4-二取代环己烷环,X是氧,R.sup.3是氰基或含有1至10个碳原子的直链烷基;烷基和/或烷氧基中碳原子的总数最多为12。式I的化合物在液晶混合物中有用。