| 摘要 |
The invention relates to a process for the preparation of compounds of formula Ia [R1FeR2'](+)q[LQm]q(-)(Ia), wherein R1 is a pi -arene, R2' is an anion of a pi -arene, L is a divalent to heptavalent metal or non-metal, Q is a halogen atom, q is an integer from 1 to 3 and m is an integer corresponding to the valency of L+q, said process comprises reacting an uncharged pi -complex of the formula IIIa [(R2')2 Fe](IIIa) with a pi arene R1 is in the presence of Al and a Lewis-acid followed by treatment with an acid or a salt of an acid of the anion [LQm]q-, the improvement consisting essentially of using TiCl4 as a Lewis-acid.
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