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. 06, 2011
Filed:
Oct. 14, 2008
Applicants:
Ronald B. Leng, Midland, MI (US);
Eric W. Otterbacher, Midland, MI (US);
Herbert N. Praay, Midland, MI (US);
Inventors:
Ronald B. Leng, Midland, MI (US);
Eric W. Otterbacher, Midland, MI (US);
Herbert N. Praay, Midland, MI (US);
Assignee:
Dow AgroSciences LLC, Indianapolis, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 69/76 (2006.01);
U.S. Cl.
CPC ...
Abstract
Cyhalofop esters are prepared by coupling 2-(4-hydroxyphenoxy)-propionic acid with 3,4-difluorobenzonitrile with base in a polar aprotic solvent (optionally including a phase-transfer catalyst), alkylating with alkyl halide, removing the polar aprotic solvent (optionally using cyhalofop ester as a flux), removing salt by aqueous extraction of molten cyhalofop ester without a solvent, and removing residual water by heating under reduced pressure.