Process for preparing a methylene-bridged biscyclopentadienyl compound

US6255508A · kind A · utility

Assignee

• Targor GmbH · DE

Inventors

• Frank Kuber · Oberursel, DE
• Michael Riedel · Essen, DE
• Berthold Schiemenz · Frankfurt am Main, DE

Key dates

• Filing date: Jun 23, 1999
• Grant date: Jul 3, 2001
• Expiry date: Jun 23, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing a methylene-bridged biscyclopentadienyl compound having the formula I ##STR1## where L are, independently of one another, identical or different and are each a cyclopentadienyl group, by reacting one or two cyclopentadienyl compounds LH with formaldehyde in monomeric, oligomeric or polymeric form or formaldehyde-generating reagents in the presence of at least one base and at least one phase transfer catalyst.