Patent · US Active

Process for the preparation of 4-amino-3-chloro-5-fluoro-6-(substituted) picolinates

US8609853B2 · kind B2 · utility

0Cited by

12References

1Claims

0Family size

Assignee

DOW AGROSCIENCES LLC · US

Inventors

Yuanming Zhu · Carmel, US
Gregory T. Whiteker · Carmel, US
Kim E. Arndt · Carmel, US
James M. Renga · Midland, US
Robert D. J. Froese · Midland, US

Key dates

Filing date	Jan 24, 2012
Grant date	Dec 17, 2013
Priority date	—
Expiry date	Jan 24, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D213/84
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

4-Amino-3-chloro-5-fluoro-6-(substituted)picolinates are conveniently prepared from 3,4,5,6-tetrachloropicolinonitrile by a series of steps involving fluorine exchange, amination, reaction with hydrazine, halogenation, hydrolysis and esterification, and transition metal assisted coupling.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.