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. 24, 2005
Filed:
Jan. 15, 2002
Thorsten Volk, Mannheim, DE;
Michael Puhl, Lampertheim, DE;
Cyrill Zagar, Mannheim, DE;
Rene Lochtman, Mannheim, DE;
Norbert Götz, Worms, DE;
Gerhard Hamprecht, Weinheim, DE;
Thorsten Volk, Mannheim, DE;
Michael Puhl, Lampertheim, DE;
Cyrill Zagar, Mannheim, DE;
Rene Lochtman, Mannheim, DE;
Norbert Götz, Worms, DE;
Gerhard Hamprecht, Weinheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention relates to a method of preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and Rrepresents C-Calkyl. The inventive method is characterized by reacting, in a first reaction step, a β-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R-L, wherein Rhas the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.