The Dow Chemical Company

Jim Love

Thomas J Dietsche

Jon A Orvik

Alexander P Fung

George S Fujioka

Demetrios Kyriacou

Fred Y Edamura

Russel R Peterson

Novel methods for preparing 2-cyano-6-chloropyridines are disclosed. The compounds are useful as intermediates in preparing other intermediates or as intermediates directly used in making pesticides, especially herbicides.

Preparation of 2-cyano-6-chloropyridine compounds

Symmetrical tetrachloropyridine, pentachloropyridine and poly-chloro derivatives of 2-chloro-6-(trichloromethyl)pyridine are prepared by reacting a chloro-substituted (trichloromethyl)pyridine in the liquid state with chlorine at temperatures of from at least about 160.degree. C. and in the presence of an amount of a catalyst effective to catalyze the reaction.

Preparation of chlorinated pyridines

Pentachloropyridine and polychloro derivatives of 2-(trichloromethyl)pyridine are prepared by reacting 2,4-dichloro-6-(trichloromethyl)pyridine in the liquid state with chlorine at temperatures of from about 160.degree. C. in the presence of an amount of catalyst effective to catalyze the reaction.

Preparation of polychlorinated pyridines from 2,4-dichloro-6-(trichloro

Electrolytic reduction of tetrachloro-2-picolinic acid in basic aqueous solution, at an activated silver cathode, yields the 3,4,6- and 3,5,6-trichloro-2-picolinic acids, which in turn may be further reduced to 3,6-dichloropicolinic acid, a highly active herbicide.

Electrolytic production of certain trichloropicolinic acids and/or

A method of regenerating the activated charcoal catalyst used in the production of sulfuryl fluoride by reaction of sulfur dioxide, chlorine and hydrogen fluoride, comprising treating the spent catalyst with an anhydrous stream of hydrogen fluoride at about 350.degree. to about 600.degree. C.

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Walnut Creek, CA, United States of America

Jim Love