Nucleophilic substitution of pentachloropyridine by bromide or iodide is an unsatisfactory route to tetrachlorohalogenopyridines. We report syntheses of all the bromotetrachloropyridines and tetrachloroiodopyridines via the corresponding pyridylhydrazines or pyridyl-lithium or -magnesium derivatives.
A. G. Mack, H. Suschitzky and B. J. Wakefield, J. Chem. Soc., Perkin Trans. 1, 1979, 1472 DOI: 10.1039/P19790001472
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