申请人:Nippon Telegraph and Telephone Corporation
公开号:US05059345A1
公开(公告)日:1991-10-22
An optically active compound represented by the general formula (I) of: R--Z--COO--(Ph).sub.k --Ph(Y)--CO--(CH.sub.2).sub.m C*HE L (1) In the general formula (I); R is an alkyl or alkoxy group having 4 to 22 carbon atoms; Z is the one selected from the group consisting of --Ph--, --Ph(X)--, --Ph--Ph--, Ph(X)--Ph--, --Ph--cy--, --Ph(X)--cy-- and --py--Ph-- is a 1,4-substituted phenylene group; --Ph--Ph-- is a 4,4'-substituted diphenylene group; --cy-- is a trans-1,4-cyclohexane group, --py is 2,5-substituted pyrimide group; X is a halogen atom at the ortho-position to R; k is zero or 1, Y is the one selected from the group consisting of H, OH, halogen atoms and methyl group; C* is an asymmetric carbon atom; E is the one selected from the group consisting of methyl group, halogen atoms and CF.sub.3 ; L is an alkyl, aryl or aralkyl group having not more than 10 carbon atoms; and m is an integer of zero to 6 where m takes zero when Y is H and Z is --Ph-- or --Ph--Ph--. The optically active compound is usable as an ingredient for a liquid crystal composition which has high spontaneous polarization, exhibits the Sc* phase (chiral smectic C liquid crystalline phase) in a wide temperature range and high speed response.
通用公式(I)表示的具有光学活性的化合物为:R--Z--COO--(Ph).sub.k --Ph(Y)--CO--(CH.sub.2).sub.m C*HE L(1)。在通用公式(I)中;R是具有4到22个碳原子的烷基或烷氧基;Z是从--Ph--,--Ph(X)--,--Ph--Ph--,Ph(X)--Ph--,--Ph--cy--,--Ph(X)--cy--和--py--Ph--组成的组中选择的一个,其中--Ph--是1,4-取代苯基;--Ph--Ph--是4,4'-取代二苯基基团;--cy--是反-1,4-环己烷基团,--py是2,5-取代嘧啶基团;X是在R的邻位上的卤原子;k为零或1,Y是从H,OH,卤原子和甲基组成的组中选择的一个;C*是一个不对称碳原子;E是从甲基组,卤原子和CF.sub.3组成的组中选择的一个;L是具有不超过10个碳原子的烷基,芳基或芳基烷基;m是一个从零到6的整数,当Y为H且Z为--Ph--或--Ph--Ph--时,m取零。这种具有光学活性的化合物可用作具有高自发极化性的液晶组合物的成分,表现出在广泛温度范围内和高速响应中的Sc*相(手性各向异性C液晶相)。