申请人:——
公开号:US04915480A1
公开(公告)日:1990-04-10
This invention concerns compounds of the formula: ##STR1## wherein X is a single covalent bond, --CH.sub.2 CH.sub.2 --, 1,4-phenylene, a 2,5-disubstituted pyrimidine ring or a group of the formula: ##STR2## ring A is trans-1,4-cyclohexylene or, when X is a single covalent bond, ring A may also be 1,4-phenylene, a 2,5-disubstituted pyrimidine ring or a trans-2,5-disubstituted m-dioxane ring; and R.sup.1 is straight-chain trans-1-alkenyl having 2 to 12 carbon atoms or straight-chain trans-3-alkenyl having 4 to 12 carbon atoms or, when X is --CH.sub.2 CH.sub.2 --, R.sup.1 may also be 1,4-phenylene, a 2,5-disubstituted pyrimidine ring or a group of formula IA or when ring A is a 2,5-disubstituted pyrimidine ring or a trans-2, 5-disubstituted m-dioxane ring, R.sup.1 may also be straight-chain alkyl with 1 to 12 carbon atoms; and one of the benzene rings may have a lateral fluorine substituent; their manufacture, and liquid crystalline mixtures and electro-optical devices containing same.
这项发明涉及以下结构的化合物:其中X是一个单共价键,-CH.sub.2 CH.sub.2 -,1,4-苯基,一种2,5-二取代嘧啶环,或者一个以下结构的基团:环A是反-1,4-环己基,或者当X是一个单共价键时,环A也可以是1,4-苯基,一种2,5-二取代嘧啶环或者反-2,5-二取代间二氧杂环戊烷环;R.sup.1是具有2至12个碳原子的直链反-1-烯基,或者具有4至12个碳原子的直链反-3-烯基,或者当X是-CH.sub.2 CH.sub.2 -时,R.sup.1也可以是1,4-苯基,一种2,5-二取代嘧啶环或者以下结构的基团IA,或者当环A是一种2,5-二取代嘧啶环或者反-2,5-二取代间二氧杂环戊烷环时,R.sup.1也可以是具有1至12个碳原子的直链烷基;其中苯环中的一个可能具有一个侧链氟取代基;它们的制备方法,以及含有这些化合物的液晶混合物和电光器件。