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:
Jun. 28, 2005
Filed:
Apr. 08, 2003
Hermann Schneider, Basel, CH;
Christoph Lüthy, Basel, CH;
Hermann Schneider, Basel, CH;
Christoph Lüthy, Basel, CH;
Syngenta Crop Protection, Inc., Greensboro, NC (US);
Abstract
The present invention relates to a process for the preparation of bicyclic 1,3-diketone salts of formula Iwherein R, R, Rand Rare each independently of the others hydrogen or C-Calkyl; A and E are each independently of the other C-Calkylene, which may be substituted once or up to four times by a C-Calkyl group, and Mis an alkali metal ion, alkaline earth metal ion or ammonium ion, by oxidation of a compound of formula IIto a compound of formula IIIand subsequent conversion to a compound of formula I either in the presence of a base and a catalytic amount of a cyanide or in the presence of an alkali metal alcoholate or alkaline earth metal alcoholate, and to novel bicyclic enol lactone intermediates of formula III for use in that process.