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:
Sep. 08, 2009
Filed:
Jun. 18, 2004
Applicants:
Bernd Gallenkamp, Wuppertal, DE;
Lubbertus Mulder, Hagen, DE;
Inventors:
Bernd Gallenkamp, Wuppertal, DE;
Lubbertus Mulder, Hagen, DE;
Assignee:
Bayer CropScience AG, Monheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 69/66 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a three-step method for the preparation of alkyl esters of 4,4-difluoroacetoacetic acid in which in the first step alkyl esters of 4-chloro-4,4-difluoroacetic acid are reacted with trialkylphosphites of formula (III)P(OR)  (III) which in the next step are reacted with an amine of formula (V),