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:
May. 15, 2001
Filed:
May. 02, 1997
Applicant:
Inventors:
Johannes A. M. van Beek, Mountain View, CA (US);
Gerardus J. M. Gruter, Maastricht, NL;
Richard Green, Geleen, NL;
Assignee:
DSM N.V., Heerlen, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 2/86 ;
U.S. Cl.
CPC ...
C07C 2/86 ;
Abstract
The process for the preparation of a selectively substituted cyclopentadiene compound which includes reacting a halide of a substituting compound in a mixture of the cyclopentadiene compound and an aqueous solution of a base in the presence of a phase transfer catalyst, wherein during the reaction the quantity of base relative to the cyclopentadiene compound may at any moment be between 5 and 30 mol/mol.