2,4,6-Triphenylpyrylium perchlorate reacts with pyridinium acylylides to form arylpyridinium perchlorates by a ring-opening–ring-closure mechanism, and with sulphonium ylides to afford furans. Spectral data are discussed.
A. R. Katritzky, S. Q. A. Rizvi and J. W. Suwinski, J. Chem. Soc., Perkin Trans. 1, 1975, 2489 DOI: 10.1039/P19750002489
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