Process for preparing cyclopentadienyl compounds

Details Process for preparing cyclopentadienyl compounds Process for preparing cyclopentadienyl compounds

C - Chemistry, Metallurgy

07

C

C07C 13/465 (2006.01) C07C 2/34 (2006.01) C07C 2/86 (2006.01) C07C 13/15 (2006.01) C07C 13/28 (2006.01) C07F 7/08 (2006.01) C07F 7/30 (2006.01) C07F 17/00 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 110/02 (2006.01) C08F 110/06 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2257132

A process for preparing bis-cylcopentadienyl compounds bridged by a methylene group is reported, said process comprising reacting formaldehyde with a cyclopentadienyl compound in the presence of a base and of a solvent having a dielectric constant (.epsilon.), measured at 25 ~C, higher than 7. The bridged compounds, obtainable in high yields with this simple single-step process, can be used to prepare ansa-metallocenes, active as catalyst components in the polymerisation of olefins.

Procédé servant à préparer des composés de bis-cyclopentadiènyle reliés par un groupe méthylène et consistant à effectuer la réaction de formaldéhyde avec un composé de cyclopentadiènyle en présence d'une base et d'un solvant possédant une constante diélectrique (.epsilon.), mesurée à 25 ·C, supérieure à 7. On peut utiliser ces composés reliés par un pont, que ce procédé simplifié à une seule étape permet d'obtenir, afin de préparer des ansa-métallocènes efficaces en tant qu'éléments catalyseurs de polymérisation d'oléfines.

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