A process is disclosed for preparing bis-cyclopentadienyl compounds bridged by a single carbon atom by reacting a carbonyl compound with a cyclopentadienyl compound in the presence of a base and of an oxygen-containing solvent having an atomic ratio carbon/oxygen not higher than 3. The compounds obtainable in high yields with this simple single-step process can be used to prepare ansa-metallocenes which are active as catalyst components in the polymerization of olefins.
本发明揭示了一种制备由单个碳原子桥接的双
环戊二烯基化合物的方法,该方法通过在碱和含氧溶剂存在下,将羰基化合物与
环戊二烯基化合物反应,所述含氧溶剂的原子比碳/氧不高于3。使用这种简单的单步法可以高产得到化合物,这些化合物可用于制备在烯烃聚合中作为催化剂组分活性的ansa-
金属茂。