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:
Dec. 11, 2001
Filed:
May. 03, 2001
Volker Maywald, Ludwigshafen, DE;
Adrian Steinmetz, Mannheim, DE;
Michael Rack, Heidelberg, DE;
Norbert Götz, Worms, DE;
Roland Götz, Neulussheim, DE;
Jochem Henkelmann, Mannheim, DE;
Heike Becker, Limburgerhof, DE;
Juan Jose Aiscar Bayeto, Mannheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention relates to a method for the production of 1-substituted 5-hydroxypyrazoles of formula (I) wherein R,is C,-C,-alkyl, C,-C,-alkenyl, C,-C,-alkinyl, C,-C,-cycloalkyl or C,-C,-alkoxy, whereby these groups can be substituted by halogen, C,-C,-alkoxy, phenoxy, C,-C,-alkoxycarbonyl, C,-C,-alkylthiocarbonyl or a cyclic ring system with 3-14 ring atoms, by reacting a) an alkylvinylether of general formula (III) wherein R,is C,-C,-alkyl or C,-C,-cycloalkyl, with phosgene (IVa), “diphosgene” (IVb) or “triphosgene” (IVc) to form acid chlorides of formula (V), b) transforming said acid chlorides by eliminating hydrogen chloride into the corresponding 3-alkoxyacrylic acid chloride of formula (VI) and c) reacting said acid chloride with hydrazines of formula (VII) wherein R,has the above cited meaning, to form 5-hydroxypyrazoles of formula (I).