| 摘要 |
A process is described for preparing compounds of the formula I [R Fe R2]q(+)Xq(-)(I) in which R is an anion of the formula C5H4R1 or C9H7, R1 is hydrogen, C1-C6-alkyl or halogen, R2 is a pi -arene, X is a q-valent anion and q is 1, 2, 3 or 4, by reacting ferrocene or a ferrocene derivative (C5H4R3)Fe(C5H4R1) or (C9H7)2Fe, in which R3 has one of the meanings of R1, with at least one mole of a pi -arene R2 in the presence of at least 1.4 moles, of a mixture of Al halide and Ti(IV) halide or (C5H4R1)-Ti(IV) halide if desired in the presence of a metallic reducing agent, followed if desired by the replacement of the anion Xq- in a manner known per se, with the proviso that the Lewis acid mixture contains at least 0.1 mole of Al halide and at least 0.1 mole of the Ti(IV) halide in question and that the indicated quantities are all based on one mole of the ferrocene (derivative). The process is suitable, if suitable amounts of reactants are chosen, for simultaneously preparing compounds of the formula I and titanocene dihalides.
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