Process for preparing tetrahalopyridines

Details Process for preparing tetrahalopyridines Process for preparing tetrahalopyridines

1987-03-17

1990-01-02

Rotman, Alan L.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

546345, C07D21172

Patent

active

048911089

ABSTRACT:
Symmetrical or 2,3,5,6-tetrahalopyridine is prepared by reacting 3,5-dihalopyridine in the liquid phase with chlorine or bromine while heating and irradiating the reactants with ultraviolet light. The reaction may be carried out with or without a chlorinated solvent. For example, 2,3,5,6-tetra-chloropyridine is prepared selectively from 3,5-dichloropyridine by chlorination at 140.degree.-150.degree. C. under ultraviolet light for 44 hours.

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Suschitzky, Polychloroaromatic Compounds, pp. 225-227 and 439-440, (1980).

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