The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1999
Filed:
Sep. 12, 1997
Applicant:
Inventors:
Assignee:
Targor GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C07F / ; C07F / ;
U.S. Cl.
CPC ...
556 53 ; 556-1 ; 556 43 ; 556 58 ; 526160 ; 526943 ; 502103 ; 502117 ; 502152 ; 534 15 ; 585361 ;
Abstract
Process for preparing a methylene-bridged cyclopentadienyl compound 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 reactin 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.