申请人:Hoffmann-La Roche Inc.
公开号:US05447657A1
公开(公告)日:1995-09-05
The present invention provides compounds of the general formula: ##STR1## wherein R is an alkyl group with 1 to 12 carbon atoms or a group of the formula ##STR2## Ring A.sup.1 is 1,4-phenylene, which is unsubstituted or substituted with fluorine, pyridine-2,5-diyl or pyrimidine-2,5-diyl; Ring A.sup.2 is trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl; R.sup.1 is an alkyl, alkenyl or alkoxyalkyl group with 1 to 12 and, respectively, 2 to 12 carbon atoms; X.sup.1 is fluorine, chlorine, bromine, trifluoromethyl, trifluoromethoxy or difluoromethoxy; and X.sup.2, X.sup.3 each independently are hydrogen or fluorine. The invention is also concerned with liquid crystal mixtures which contain these compounds and with the use of these compounds and mixtures for electro-optical purposes.
本发明提供了通式为: ##STR1## 其中R是具有1到12个碳原子的烷基或具有以下结构的基团 ##STR2## 环A.sup.1是1,4-苯撑基,它未被取代或被氟、吡啶-2,5-二基或嘧啶-2,5-二基取代;环A.sup.2是反-1,4-环己撑基或反-1,3-二氧杂环戊撑基;R.sup.1是具有1到12个碳原子的烷基、烯基或烷氧基烷基,分别具有2到12个碳原子;X.sup.1是氟、氯、溴、三氟甲基、三氟甲氧基或二氟甲氧基;X.sup.2、X.sup.3各自独立地为氢或氟。本发明还涉及包含这些化合物的液晶混合物以及这些化合物和混合物用于电光目的的使用。