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:
Feb. 28, 2012
Filed:
May. 13, 2008
Fanny Giordano, Muenchwilen, CH;
Thomas Vettiger, Muenchwilen, CH;
Juerg Gustav Wiss, Muenchwilen, CH;
Linhua Wang, Greensboro, NC (US);
Fanny Giordano, Muenchwilen, CH;
Thomas Vettiger, Muenchwilen, CH;
Juerg Gustav Wiss, Muenchwilen, CH;
Linhua Wang, Greensboro, NC (US);
Syngenta Crop Protection, Inc., Greensboro, NC (US);
Abstract
A process for the production of a compound of formula (I), which comprises a) reacting a compound of formula (II), wherein Rand Rare both independently C-Calkyl, with methylhydrazine in the presence of water and a water-immiscible organic solvent being inert in saponification reactions, to form a compound of formula (III) wherein Ris as defined for formula (II) and b) saponifying that compound in situ leading to the formation of the compound of formula (I) by b1) adding a base to form the anion of the compound of formula (I) and then adding an; acid to form the compound of formula (I); or b2) adding an acid to form the compound of formula (I).