Optically active compound for use in liquid crystal compositios provided with suitable characteristics, have the formula:
in which R¹ and R² are each a C₁-C₂₀ alkyl group or C₁-C₂₀ alkoxy group or a hydrogen atom; ℓ, m and n are each 0 or 1; X is a fluorine, chlorine or bromine atom or a cyano group, and the group
are each independently a group
(in which Y is hydrogen or halogen atom or a cyano group).
用于液晶组合物的具有适当特性的光学活性化合物,其
化学式为
其中 R¹ 和 R² 各为 C₁-C₂₀ 烷基或 C₁-C₂₀ 烷氧基或氢原子;ℓ、m 和 n 各为 0 或 1;X 为
氟、
氯或
溴原子或
氰基,且基团
各自独立地为一个基团
(其中 Y 为氢原子、卤素原子或
氰基)。