Process for the production of 2,3,5,6-tetrachloropyridine and 2,3,6-trichloropyridine
AssigneeThe Dow Chemical Company
InventorsMichael A. DesJardin, Todd E. Kindorf
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Abstract
Vapor phase chlorination of 2,6-dichloropyridine produces 2,3,6-trichloropyridine selectively over isomeric 2,4,6-trichloropyridine and of 2,3,6-trichloropyridine produces 2,3,5,6-tetrachloropyrindine in high selectivity over isomeric 2,3,4,6-tetrachloropyridine at temperatures of 300.degree. C. to 450.degree. C. The products are intermediates for insecticides and herbicides.
Claims9
A process for selectively preparing a polychloropyridine of the formula ##STR3## wherein X represents Cl or H which comprises contacting with chlorine in the vapor phase at about 300.degree. C. to about 450.degree. C. a less chlorinated polychloropyridine of the formula ##STR4## wherein X represents Cl or H.
Dependencies are inferred from the claim text.