Irradiation of 3-(but-3-enyl)oxy- and 3-(pent-4-enyl)oxy-cyclohex-2-enones results in an intramolecular cycloaddition to afford stereospecifically 2-oxabicyclo-[3,2,0]heptane and -[4,2,0]octane systems, respectively.
Y. Tamura, H. Ishibashi, Y. Kita and M. Ikeda, J. Chem. Soc., Chem. Commun., 1973, 101 DOI: 10.1039/C39730000101
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