There is disclosed a process for the preparation of compounds of formula I [R Fe R.sup.2 ].sub.q.sup..sym. X.sup.q.crclbar. (I), wherein R is an anion of formula C.sub.5 H.sub.4 R.sup.1 or C.sub.9 H.sub.7, R.sup.1 is hydrogen, C.sub.1 -C.sub.6 -alkyl or halogen, R.sup.2 is a .pi.-arene, X is an anion of valency q and q is 1, 2 or 3, by reacting ferrocene or a ferrocene derivative (C.sub.5 H.sub.4 R.sup.3)Fe(C.sub.5 H.sub.4 R.sup.1) or (C.sub.9 H.sub.7).sub.2 Fe, in which R.sup.3 has one of the meanings of R.sup.1, with at least one mole of a .pi.-arene R.sup.2, followed by the optional replacement of the anion X.sup.q.crclbar. in a manner known per se, the reaction of the ferrocene or ferrocene derivative being carried out in the presence of (a) at least 1.2 mol of a mixture of Al trihalide and Zr(IV) or Hf(IV) tetrahalide, in the presence or absence of a metallic reducing agent, such that at least 0.2 mol of Zr(IV) or Hf(IV) tetrahalide and at least 0.1 mol of Al trihalide are present, or of (b) at least 1.0 mol of a Zr(IV) or Hf(IV) tetrahalide as sole Lewis acid in conjunction with at least 1.0 mol of a metallic reducing agent, the amounts being based in each case on 1 mol of ferrocene or a ferrocene derivative. The compounds of formula I containing non-nucleophilic anions can be used as photoinitiators for cationically polymerizable compounds.
本发明涉及一种制备式I [RFeR.sup.2].sub.q.sup..sym. X.sup.q.crclbar. (I)化合物的方法,其中R是公式C.sub.5H.sub.4R.sup.1或C.sub.9H.sub.7的阴离子,R.sup.1是氢、C.sub.1-C.sub.6烷基或卤素,R.sup.2是.pi.-
芳香烃,X是价态为q的阴离子,q为1、2或3,通过将
二茂铁或
二茂铁衍
生物(C.sub.5H.sub.4R.sup.3)Fe(C.sub.5H.sub.4R.sup.1)或(C.sub.9H.sub.7).sub.2Fe(其中R.sup.3具有R.sup.1的一种含义)与至少一个摩尔的.pi.-
芳香烃R.sup.2反应,随后按已知方式选择性地替换X.sup.q.crclbar.阴离子,
二茂铁或
二茂铁衍
生物的反应在(a)至少1.2摩尔的Al三卤化物和Zr(IV)或Hf(IV)四卤化物的混合物存在下进行,存在或不存在
金属还原剂,使至少存在0.2摩尔的Zr(IV)或Hf(IV)四卤化物和至少0.1摩尔的Al三卤化物,或(b)至少1.0摩尔的Zr(IV)或Hf(IV)四卤化物作为唯一的
路易斯酸,与至少1.0摩尔的
金属还原剂结合使用,每种情况下的量都是基于1摩尔的
二茂铁或
二茂铁衍
生物。含有非亲核阴离子的式I化合物可用作阳离子聚合化合物的光
引发剂。