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:
Apr. 06, 2010
Filed:
Oct. 26, 2006
Monika Brink, Ingelheim, DE;
Marcus Knell, Hochheim, DE;
Jan Hendrik Wevers, Hohen-Sülzen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a process for the preparation of pyridylcarboxylic amides and esters I, Formula (I) wherein Hal, X and Rhave the meanings given in claim, which comprises the following steps: (a) heating a mixture consisting essentially of trichloromethylpyridine II, Formula (II), wherein Hal has the meaning given, and 1.0 to 1.5 equivalents of concentrated sulfuric acid, characterized in that the trichloromethylpyridine II in a liquid form is added to the concentrated sulfuric acid at a temperature from 110° C. to 160° C.; and (b) reacting the intermediate product obtained in step (a) with an amine or alcohol III, HXR, wherein X and Rhave the meaning given, optionally in the presence of a solvent and/or a base.