Process for preparing cyclopentadienyl compounds

Details Process for preparing cyclopentadienyl compounds Process for preparing cyclopentadienyl compounds

1998-03-30

2000-12-19

Nazario-Gonzalez, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556431, 556466, 556467, 585360, 526160, 526943, 502103, 502117, C07F 730, C07F 702, C07F 1700

Patent

active

061629375

ABSTRACT:
A process for preparing bis-cyclopentadienyl 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.degree. 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 polymerization of olefins.

REFERENCES:
patent: 5459117 (1995-10-01), Ewen
patent: 5670681 (1997-09-01), Kuber
patent: 5945553 (1999-08-01), Kuber et al.
John A. Ewen, Makromol. Chem., Macromol, Symp. 48/49, 253-295 (1991).
Ghera, et al. J.A.C.S. vol. 82, pp. 4945-4952 (1960).
Schore, et al. J.A.C.S. vol. 106, pp. 7451-7461 (1984).
PCT Application PCT/EP 38-01930 (Jun. 24, 1998).
1991 Makromol. Chem., Macromol. Symp. 48-49, pp. 253-295 **1991 Huthig & Wepf Verlag, Basel.

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