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. 04, 2020
Filed:
Jan. 23, 2017
Applicant:
Dow Agrosciences Llc, Indianapolis, IN (US);
Inventors:
Kenneth E. Stockman, Midland, MI (US);
Gregory T. Whiteker, Carmel, IN (US);
Erich J. Molitor, Midland, MI (US);
Nakyen Choy, Carmel, IN (US);
Assignee:
Dow AgroSciences LLC, Indianapolis, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 213/803 (2006.01); C07D 213/84 (2006.01); C07D 213/79 (2006.01);
U.S. Cl.
CPC ...
C07D 213/84 (2013.01); C07D 213/79 (2013.01); C07D 213/803 (2013.01);
Abstract
4-Alkoxy-3-hydroxypicolinic acids may be conveniently prepared from 4,6-dibromo-3-hydroxypicolinonitrile in a series of chemical steps selected from bromo substitution, nitrile hydrolysis and halogen reduction that are conducted as a single pot process. 4,6-Dibromo-3-hydroxypicolinonitrile may be prepared from furfural in a series of chemical steps selected from cyano-amination, amine salt formation and bromination-rearrangement.