The β-allyloxy-ketones (1) and (6) undergo cyclisation on u.v. irradiation to yield the 2-alkenyl-3-hydroxytetrahydrofurans (2), (3), and (7)–(10); similar cyclisation of the aldehyde (12) has been used in a dihydrofuran-3(2H)-one synthesis.
H. A. J. Carless and D. J. Haywood, J. Chem. Soc., Chem. Commun., 1980, 657 DOI: 10.1039/C39800000657
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