A liquid crystal compound of the formula:
wherein R1 is an alkyl group, X is chloro or bromo, and R2 is a branched-alkyl group; and the carbon atom marked with an * I is an asymmetric carbon atom.
                            一种液晶化合物,其式如下: 其中 R1 是烷基,X 是
氯或
溴,R2 是支链烷基;标有 * I 的碳原子是不对称碳原子。