Treatment of 1-acetoxy-1H-2-benzopyran-4-one with either base or heat generates the parent 2-benzopyrylium-4-oxide system which gives intermolecular cycloadducts with a variety of dipolarophiles, including olefins.
P. G. Sammes and R. J. Whitby, J. Chem. Soc., Chem. Commun., 1984, 702 DOI: 10.1039/C39840000702
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