A novel liquid crystalline carbonate and the mixture containing the same:
wherein R3 is an alkyl (H
2n+1
C
n
) or an alkenyl (H
2n−1
C
n
) group, each of 1 to 12 carbon atoms, the ring A is laterally unsubstituted benzene or pyridine or pyrimidine or trans-substituted cyclohexane ring, symbol r is 0 to 2; the lateral substituents: X
2
, X
3
, X
4
and X
5
in the benzene rings represent independently hydrogen or fluorine or chlorine atoms, X
1
is hydrogen or fluorine atom and simultaneously at least one of the substituents: X
2
, X
3
and X
4
is fluorine or chlorine atoms, Y is an alkyl or an alkyloxy or an alkenyl or an aikenyloxy group, each of 1 to 12 carbon atoms or hydrogen or fluorine or chlorine atom or NCS group are described.
一种新型
液晶碳酸酯及其含有的混合物:其中R3是一个烷基(H2n+1Cn)或
烯基(H2n−1Cn)基团,每个基团含有1至12个
碳原子,环A是侧链未取代的
苯或
吡啶或
嘧啶或反取代的
环己烷环,符号r为0至2;
苯环中的侧链取代物X2、X3、X4和X5分别代表
氢或
氟或
氯原子,X1为
氢或
氟原子,同时至少有一个取代物X2、X3和X4为
氟或
氯原子,Y是一个烷基或烷
氧基或
烯基或
烯氧基基团,每个基团含有1至12个
碳原子或
氢或
氟或
氯原子或
NCS基团。