The Dow Chemical Company

John A Werner

Charles A Wilson

Craig E Mixan

Preparation of 2,3-dichloro-5-trichloromethylpyridine in high yields and purity by chlorinating 2-chloro-5-trichloromethylpyridine at 70.degree. to 250.degree. C. with chlorine in the presence of a catalyst containing one or more molybdenum, tungsten or ruthenium compounds.

Preparation of 2,3-dichloro-5-trichloromethylpyridine

Novel 2,3-difluoro-5-(trifluoromethyl)pyridine is prepared by fluorinating 3-chloro-2-fluoro-5-(trifluoromethyl)pyridine under favorable conditions. The compound is useful as a chemical intermediate in the preparation of herbicides.

2,3-difluoro-5-(trifluoromethyl)pyridine

2-Fluoro-pyridine compounds are contacted with a chlorinating agent at superatmospheric pressures to yield 2-chloro-pyridine compounds.

Chlorine exchange for fluorine in 2-fluoro-pyridine compounds

2,3-Difluoro-5-(trifluoromethyl)pyridine and methods of making and using

2,3-Dichloro-5-trichloromethylpyridine is produced by selective liquid phase chlorination of 2-chloro-5-trichloromethylpyridine.

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Antioch, CA, United States of America

John A Werner