Patent ID: 6277502
Filing Date: 2001-08-21
Classification: C07F,C09K,G02F

Abstract:
A silane of the general formula I: ##STR5##in whichX.sup.1, X.sup.2 and X.sup.3 denote alkyl, alkoxy or halogen, but at least one of these radicals is either alkoxy or halogen;S.sup.1 denotes a spacer unit or denotes a chain of the formula --(CH.sub.2).sub.r --L--(CH.sub.2).sub.s --, in which L denotes a single bond or linking functional group and r and s each represent an integer from 1 to 20, with the proviso that r+s is .ltoreq.25;Ring A denotes unsubstituted or fluorine-, chlorine-, cyano-, alkyl- or alkoxy-substituted phenylene, pyrid-2,5-diyl, pyrimidin-2,5-diyl, 1,3-dioxane-2,5-diyl, cyclohexane-1,4-diyl, piperidin-1,4-diyl or piperazin-1,4-diyl, it being possible for the alkyl and/or the alkoxy substituent to be mono- or polysubstituted by fluorine;Ring B denotes unsubstituted or fluorine-, chlorine-, cyano-, alkyl- or alkoxy-substituted phenylene, pyrid-2,5-diyl, pyrimidin-2,5-diyl, 1,4- or 2,6-naphthylene, 1,3-dioxane-2,5-diyl or cyclohexane-1,4-diyl, it being possible for the alkyl and/or the alkoxy substituent to be mono- or polysubstituted by fluorine;K is hydrogen, fluorine, chlorine, cyano, nitro or a straight-chain or branched alkyl, alkoxy, alkyl-COO, alkyl-CO--NR.sup.2 or alkyl-OCO group having 1 to 20 carbon atoms which is optionally substituted by fluorine, chlorine, cyano or nitro and in which optionally one CH.sub.2 group or a plurality of non-neighboring CH.sub.2 groups may be replaced by O, CH.dbd.CH or C.ident.C and in which R.sup.2 denotes hydrogen or lower alkyl;Y.sup.1 and Y.sup.2 independently of one another, denote a single covalent bond, --(CH.sub.2).sub.t --, --O--, --CO--, --CO--O--, --O--OC--, --NR.sup.3 --, --CO--NR.sup.3 --, --R.sup.3 N--CO--, --(CH.sub.2).sub.u --O--, --O--(CH.sub.2).sub.u --, --(CH.sub.2).sub.u --NR.sup.3 -- or NR.sup.3 --(CH.sub.2).sub.u --, in whichR.sup.3 denotes hydrogen or lower alkyl;t denotes an integer from 1 to 4;u denotes an integer from 1 to 3;m and n, independently of one another, denote 0 or 1;Ring C denotes unsubstituted or fluorine-, chlorine-, cyano-, alkyl- or alkoxy-substituted phenylene, pyrimidin-2,5- or 3,5-diyl, pyrid-2,5- or -2,4-diyl or -2,6-diyl, 2,5-thiophenylene, 2,5-furanylene, 1,4- or 2,6-naphthylene, it being possible for the alkyl and/or the alkoxy substituent to be mono- or polysubstituted by fluorine;Z denotes --O-- or --NR.sup.4 -- and R.sup.4 denotes hydrogen or lower alkyl, with the proviso that K is not hydrogen when simultaneously m is 0, n is 0, and Ring C is unsubstituted phenylene.