Optically active liquid crystalline compounds have the formula
in which ℓ and m are each 0 or 1; at least one of R¹ and R² is an optically active alkoxy group of the formula -OCH-R⁴ ( in which R³ is a C²-C₃ alkyl group and R⁴ is a C₃-C₁₈ alkyl group, provided that R³ is not the same as R⁴) and the other of R¹ and R² is a C₁-C₂₀ alkyl, C₁-C₂₀ alkoxy or C₁-C₂₀ alkanoyloxy group or a halogen atom or a cyano group; and A is a group:
(in X, Y and Z are each independently a hydrogen or halogen atom or a cyano group).
光学活性液晶化合物的
化学式为
其中 ℓ 和 m 各为 0 或 1;R¹ 和 R² 中至少有一个是式 -OCH-R⁴ 的光学活性烷氧基(其中 R³ 是 C²-C₃ 烷基,R⁴ 是 C₃-C₁₈ 烷基、而 R¹ 和 R² 中的另一个是 C₁-C₂₀ 烷基、C₁-C₂₀ 烷氧基或 C₁-C₂₀ 烷酰氧基或卤原子或
氰基;而 A 是一个基团:
(X、Y 和 Z 各自独立地为氢原子、卤素原子或
氰基)。