A compound useful as a constituent of liquid crystal materials for ferroelectric liquid crystal display elements and a liquid crystal composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R represents a linear or branched chain alkyl group or alkoxy group each of 1 to 20 carbon atoms, R* represents an optically active group of 3 to 16 carbon atoms and X and Y each represent H or F.
提供了一种有用的化合物,作为
铁电液晶显示元件液晶材料的成分,并且包含该化合物的液晶组合物,该化合物由以下式子表示:##STR1##其中,R代表1至20个碳原子的线性或支链烷基或烷氧基,R*代表3至16个碳原子的光学活性基团,而X和Y分别代表H或F。