The retro-Claisen rearrangement of the formylethynyl-cyclopropanes (1a–c) followed by a [1,3] hydrogen shift yields two types of products depending on the nature and position of the substituents: the alkylidene-dihydro-oxepins (3a–c) and the phenol (6).
F. Bourelle-Wargnier, M. Vincent and J. Chuche, J. Chem. Soc., Chem. Commun., 1979, 584 DOI: 10.1039/C39790000584
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