Process for the manufacture of...

Details Process for the manufacture of... Process for the manufacture of...

2008-10-14

2011-12-06

Young, Shawquia (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

08071804

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.

REFERENCES:
patent: 4897481 (1990-01-01), Kershner et al.
patent: PCT/US2008/079838 (2002-12-01), None

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