Bicyclooctane derivatives of the formula I R.sup.1 --A.sup.1 --A.sup.2 --R.sup.2 I wherein R.sup.1 and R.sup.2 independently of one another are each an alkyl group which has 1-12 C atoms and in which it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by O atoms and/or CO groups and/or --O13 CO groups and/or --CO--O groups and/or --CH.dbd.CH-- groups, one of the radicals R.sup.1 and R.sup.2 being also --A.sup.3 --R.sup.3, A.sup.1 is a 1,4-cyclohexylene group which is unsubstituted or substituted in the 1-position and/or 2-position and/or 3-position and/or 4-position by alkyl which has in each case 1-5 C atoms and is unsubstituted or substituted or fluorinated, and in which it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by one or two different groupings from the group --O--, --CO--, --CH.dbd.CH--, --S--, --SO-- or --SO.sub.2 --, or is substituted by F, Cl, Br, CN and/or CHO, A.sup.2 is a 1,4-bicyclo[2.2.2] octylene group, --A.sup.3 --R.sup.3 is --Cy--R.sup.3, --Ph--R.sup.3, --Cy--Ph--R.sup.3 or --Ph--Cy--R.sup.3, Cy is 1,4-cyclohexylene or one of the other groups recited for A.sup.1, Ph is 1,4-phenylene which is unsubstituted or substituted by or one two F atoms and/or CH.sub.3 groups and R.sup.3 is an alkyl group which has 1-12 C atoms and in which it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by O atoms and/or CO groups and/or O--CO groups and/or --CO--O groups and/or --CH.dbd.CH-- groups are suitable for use as components of liquid-crystal phases for field effect and/or bistability effect displys.
公式I中的Bicyclooctane衍
生物,其中R.sup.1和R.sup.2分别独立地是具有1-12个C原子的烷基基团,其中也可能有一个或两个非相邻的CH.sub.2基团被O原子和/或CO基团和/或--O13 CO基团和/或--CO--O基团和/或--CH.dbd.CH--基团替换,其中R.sup.1和R.sup.2中的一个基团也可以是--A.sup.3--R.sup.3,A.sup.1是未取代或在1-位置和/或2-位置和/或3-位置和/或4-位置被具有每种情况下1-5个C原子的未取代或取代或
氟化的烷基取代的1,4-环己基烷基团,并且其中也可能有一个或两个非相邻的CH.sub.2基团被来自群--O--、--CO--、--CH.dbd.CH--、--S--、--SO--或--SO.sub.2--的一个或两个不同的基团替换,或被F、Cl、Br、CN和/或CHO取代,A.sup.2是1,4-双环[2.2.2]辛基烷基团,--A.sup.3--R.sup.3是--Cy--R.sup.3、--Ph--R.sup.3、--Cy--Ph--R.sup.3或--Ph--Cy--R.sup.3,Cy是1,4-环己基烷基或A.sup.1中列出的其他基团之一,Ph是未取代或被一个或两个F原子和/或CH.sub.3基团取代的1,4-苯基烷基,并且R.sup.3是具有1-12个C原子的烷基基团,其中也可能有一个或两个非相邻的CH.sub.2基团被O原子和/或CO基团和/或O--CO基团和/或--CO--O基团和/或--CH.dbd.CH--基团替换,适用于作为液晶相的组分,用于场效应和/或双稳态效应显示。