申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US05209866A1
公开(公告)日:1993-05-11
Heterocyclic 1,2-difluorobenzene derivatives of the formula I ##STR1## in which R.sup.1 and R.sup.2, in each case independently of one another, are an alkyl groups (sic) having 1-15 C atoms in which, in addition, one or more CH.sub.2 groups may be replaced by a divalent radical selected from the group comprising --O--, --S--, --CO--, --O--CO--, --CO--O--, --CH.dbd.CH-- and --C.tbd.C--, where two heteroatoms are not linked directly to one another, A.sup.1 and A.sup.2, in each case independently of one another, are a 1,4-phenylene group which is unsubstituted or monosubstituted or polysubstituted by fluorine, and in which, in addition, one or two CH groups may be replaced by N, or are a 1,3,4-thiadiazole-2,5-diyl group or a trans-1,4-cyclohexylene group, m and n are each 0 or 2, o is 0 or 1, and p is 0, 1 or 2, where (o+p) is 1, 2 or 3 and, in the case where p=2, the A.sup.2 groups and n may be identical or different with the proviso that at least one of the groups A.sup.1 and A.sup.2 is a 1,3,4-thiadiazole-2,5-diyl group or an unsubstituted or substituted 1,4-phenylene group in which one or two CH groups have been replaced by N, are suitable as components of liquid-crystalline phases.
公式I中的杂环
1,2-二氟苯衍
生物,其中R1和R2分别独立地是具有1-15个C原子的烷基基团,此外,一个或多个
CH2基团可以被从以下组中选择的二价基团所取代,所述组包括--O--,--S--,--CO--,--O--CO--,--CO--O--,--CH=CH--和--C≡C--,其中两个杂原子未直接连接在一起,A1和A2分别独立地是未取代或单取代或多取代的1,4-苯基基团,其中一个或两个CH基团可以被N所取代,或者是1,3,4-
噻二唑-2,5-二基基团或反-1,4-环己基基团,m和n各为0或2,o为0或1,p为0、1或2,其中(o+p)为1、2或3,在p=2的情况下,A2基团和n可以相同或不同,但至少有一个A1和A2基团是1,3,4-
噻二唑-2,5-二基基团或未取代或取代的1,4-苯基基团,其中一个或两个CH基团已被N所取代,适用于液晶相的组分。