申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US05248447A1
公开(公告)日:1993-09-28
2,3-difluorohydroquinone compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2, in each case independently of one another, are alkyl having 1 to 15 C atoms or alkenyl having 3 to 15 C atoms which are unsubstituted, monosubstituted by cyano or at least monosubstituted by fluorine or chlorine, it also being possible for one CH.sub.2 group in these radicals to be replaced by --O--, --CO--, --CO--O--, --O--CO-- or --O--CO--O--, A.sup.1, A.sup.2 and A.sup.3, in each case independently of one another, are (a) trans-1,4-cyclohexylene, in which, in addition, one or two non-adjacent CH.sub.2 groups may be replaced by --O-- and/or --S--, (b) 1,4-phenylene, in which, in addition, one or two CH groups may be replaced by N, or (c) a radical from the group comprising piperidine-1,4-diyl, 1,4-bicylo (2,2,2)-octylene (sic), 1,3,4-thiadiazole-2,5-diyl, napththalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, it being possible for the radicals (a) and (b) to be monosubstituted or polysubstituted by F, Cl, CH.sub.3 or CN, Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --C.tbd.C-- or a single bond, Q.sup.1 and Q.sup.2, in each case independently of one another, are --CO-- or --CH.sub.2 --, m and n are each 0, 1 or 2, and (m+n) is 0, 1 or 2, are suitable as components of liquid-crystalline phases.
化学式I的2,3-二氟羟基苯酚化合物中,其中R.sup.1和R.sup.2分别独立地是具有1至15个碳原子的烷基或具有3至15个碳原子的烯基,未被取代,单取代为氰基或至少单取代为氟或氯,这些基团中的一个CH.sub.2基团也可以被--O--,--CO--,--CO--O--,--O--CO--或--O--CO--O--取代,A.sup.1,A.sup.2和A.sup.3分别独立地是(a)反-1,4-环己烯基,此外,一个或两个非相邻的CH.sub.2基团可以被--O--和/或--S--取代,(b) 1,4-苯基,此外,一个或两个CH基团可以被N取代,或(c)来自包括哌啶-1,4-二基,1,4-双环(2,2,2)-辛烷基,1,3,4-噻二唑-2,5-二基,萘-2,6-二基,去氢萘-2,6-二基和1,2,3,4-四氢萘-2,6-二基的基团,基团(a)和(b)可以单取代或多取代为F,Cl,CH.sub.3或CN,Z.sup.1为--CO--O--,--O--CO--,--CH.sub.2 CH.sub.2 --,--OCH.sub.2 --,--CH.sub.2 O--,--C.tbd.C--或单键,Q.sup.1和Q.sup.2分别独立地为--CO--或--CH.sub.2 --,m和n分别为0,1或2,且(m+n)为0,1或2,可作为液晶相的组分。