A fluorine-containing optically active compound represented by the formula (1): ##STR1## wherein R.sub.1 is a saturated or unsaturated C.sub.3 -C.sub.20 alkyl group or a saturated or unsaturated C.sub.3 -C.sub.20 alkoxyalkyl group; A.sup.1, A.sup.2 and A.sup.3 independently represent one of the following groups: ##STR2## provided that, when A.sup.1 is a condensed ring group, a sum of p and q is 0 or 1 and A.sup.2 and A.sup.3 are both monocyclic groups, or when A.sup.1 is a monocyclic group, a sum of p and q is 1 or 2 with the proviso that when the sum of p and q is 2, A.sup.2 and A.sup.3 are both monocyclic groups; X is --CH.sub.2 CH.sub.2 --, --CH.dbd.CH-- or --C.tbd.C--; W is a fluorine atom or a hydrogen atom; n is an integer of 1 to 10; m, p and q are each 0 or 1; u and w are each an integer of 0 to 3; and * indicates an asymmetric carbon atom, which is useful as a component of a liquid crystal mixture.
                            一种含
氟的光学活性化合物,其
化学式为(1):##STR1## 其中R.sub.1是饱和或不饱和的C.sub.3 -C.sub.20烷基或饱和或不饱和的C.sub.3 -C.sub.20烷氧基烷基;A.sup.1、A.sup.2和A.sup.3分别表示以下一种基团:##STR2## 其中,当A.sup.1是一个缩环基团时,p和q的和为0或1,并且A.sup.2和A.sup.3都是单环基团;或者当A.sup.1是一个单环基团时,p和q的和为1或2,但当p和q的和为2时,A.sup.2和A.sup.3都是单环基团;X是--CH.sub.2 CH.sub.2 --、--CH.dbd.CH--或--C.tbd.C--;W是
氟原子或氢原子;n是1到10的整数;m、p和q都是0或1;u和w都是0到3的整数;*表示一个不对称碳原子,可作为液晶混合物的组分。