Y. M. Yutilov, I. A. Svertilova
Aug 1, 1994
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Journal
Chemistry of Heterocyclic Compounds
Abstract
Unsubstituted imidazo[4, 5-c]pyridine does not react with chlorine, bromine, or iodine at room temperature or even upon heating to 160°C. The introduction of an oxo group activates the system such that halogenation proceeds readily. Imidazo[4, 5-c]pyridin-4-one gives 7-halo derivatives, while imidazo[4, 5-c]pyridin-2-ones give 4, 7-dihalo products.