| 摘要 |
K -13926/+/B Process for preparing metellocene complexes The invention provides an improved process for the preparation of compounds of formula Ia (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 comprising reacting an uncharged .pi.-complex of the formula IIIa (IIIa) with a .pi.-arene R1 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-, in which process the improvement consists essentially of using TiCl4 as a Lewis-acid. |
