Patents Represented by Attorney D. Wendell Obsorne

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  • Process for the production of 2,3,5,6-tetrachloropyridine and 2,3,6-trichloropyridine
    Patent number: 4785112
    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.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: November 15, 1988
    Assignee: The Dow Chemical Company
    Inventors: Michael A. DesJardin, Todd E. Kindorf