Cyclobutane derivatives, formed by [π2 +π2] photoaddition of 3-acetoxy-2-acetylbenzo[b]furan to alkenes, undergo base- and acid-catalysed retro-aldol cleavage to yield benz[b]oxepin-5-ones.
J. H. M. Hill and S. T. Reid, J. Chem. Soc., Chem. Commun., 1983, 501 DOI: 10.1039/C39830000501
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