1-Aminopyridinium cations react with certain pyrones to give pyridiniopyridone cations which are converted by POCl3 into chloropyridiniopyridinium dications; these cations are used to synthesise 1-aryl-pyridinium salts, 2-cyanopyridine, and also 2,4-bis-(benzenesulphonyl)pyridine.
A. R. Katritzky and M. P. Sammes, J. Chem. Soc., Chem. Commun., 1975, 247 DOI: 10.1039/C39750000247
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