Whereas 2-arylamino-4,6-diphenylpyrylium chlorides are readily converted into 2-pyridones, the corresponding 2-arylamino-4,6-diphenylthiopyryliuni iodides do not give pyridine-2-thiones; mass spectra unambiguously distinguish between isomeric structures in these series.
A. S. Afridi, A. R. Katritzky and C. A. Ramsden, J. Chem. Soc., Chem. Commun., 1976, 899 DOI: 10.1039/C39760000899
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