The allylsilanes (1), containing suitably-substituted hydroxy-groups, on treatment with iodosylbenzene in the presence of BF3–Et2O in an ether solvent, give 5- or 6-membered β-methylene cyclic ehters (3) in good yields, presumably via the highly reactive alylaryliodonium intermediates (2).
M. Ochiai, E. Fujita, M. Arimoto and H. Yamaguchi, J. Chem. Soc., Chem. Commun., 1982, 1108 DOI: 10.1039/C39820001108
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