Selective gas phase chlorination of polychlorinated .beta.-picol

Details Selective gas phase chlorination of polychlorinated .beta.-picol Selective gas phase chlorination of polychlorinated .beta.-picol

1991-11-26

1994-06-07

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546346, C07D21361, C07D21326

Patent

active

053190882

ABSTRACT:
2,3,5,6-Tetrachloropyridine, and 2,3-dichloro-5-(trichloromethyl)pyridine are prepared by selectively chlorinating polychlorinated .beta.-picolines in the vapor phase between about 250.degree. and 450.degree. C. in the presence of specific Lewis acid halide catalysts on an inorganic support. The gamma position on the pyridine ring is usually not chlorinated in the starting material or reaction products. These compounds are useful intermediates to produce insecticides and herbicides.

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