The base-catalysed reaction of 2-phenyloxazolin-5-one with five tri- or tetra-substituted pyrylium perchlorates yielded derivatives of benzanilide; intermediate unsaturated azlactones were isolated in two cases. 2,6-Di-phenylpyrylium perchlorate gave a 4-pyranylideneoxazolinone.
G. V. Boyd and S. R. Dando, J. Chem. Soc., Perkin Trans. 1, 1972, 1142 DOI: 10.1039/P19720001142
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