The Dow Chemical Company

Theodore J Sobieralski

Charles K Bon

Arthur J Kamp

The selective reduction of pentachloropyridine to 2,3,5,6-tetrachloropyridine is achieved by contacting the pentachloropyridine as a solution in perchloroethylene or methylene chloride with zinc dust in a basic aqueous medium.

Selective reduction of pentachloropyridine to

Powders consisting essentially of zinc but having lead contents of from about 1000 to about 30,000 ppm can readily be produced by electrolysis of lead-containing, zinc halide solutions and are superior reductants for the preparation of symmetrical tetrachloropyridine from pentachloropyridine.

Impure zinc powder, preparation thereof, and use as a selective

2,3,5,6-Tetrachloropyridine is obtained in high selectivity and yield by the electrocatalytic reduction at a stainless steel cathode of pentachloropyridine in an aqueous acetonitrile solution containing zinc chloride. Chlorine or oxygen may be co-produced at the anode.

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Antioch, CA, United States of America

Theodore J Sobieralski