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:
Mar. 07, 2006
Filed:
May. 11, 2000
Applicants:
Yves Bessard, Sierre, CH;
Gerhard Stucky, Brig-Glis, CH;
Jean-paul Roduit, Grone, CH;
Inventors:
Assignee:
Lonza AG, Gampel/Valais, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 213/80 (2006.01); C07D 213/803 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for preparing pyridine-2,3-dicarboxylic acid esters of the general formula:wherein R is C-alkyl, C-cycloalkyl, aryl or arylalkyl, and Rto R, independently of one another, represent hydrogen, C-alkyl, fluorinated C-alkyl, C-alkoxy, (C-alkoxy)-C-alkyl or (C-alkoxy)carbonyl. These esters are obtained from the corresponding 2,3-dichloropyridine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium-diphosphine complex and a weak base. Pyridine-2,3-dicarboxylic acid esters are herbicides or intermediates for the preparation of herbicides.