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. 28, 2013
Filed:
Apr. 14, 2011
Raphael Dumeunier, Stein, CH;
Hans Tobler, Basel, CH;
Raphael Dumeunier, Stein, CH;
Hans Tobler, Basel, CH;
Syngenta Crop Protection LLC, Greensboro, NC (US);
Abstract
The invention relates to a process for the preparation of formula (I), which process comprises a) reacting the compound (II), with cyclopentadiene to (III); b) reacting this compound in the presence of an oxidant to the compound of formula (IV); c) hydrogenating this compound in the presence of a metal catalyst and an inert solvent under hydrogen atmosphere to the compound of formula (V); d) reacting this compound in the presence of a Brönsted acid followed by a reducing agent to the compound of formula (VI); e) reacting VI with a compound (VII), in the presence of a base to a compound of formula (VIII); f) converting the compound of formula VIII in the presence of an oxidizing agent to the compound of formula (IX); and g) reacting the compound of formula IX in the presence of triphenylphosphane/carbon tetrachloride or riphenylphosphane/bromotrichloromethane to the compound of formula I.