Suitable alkenoyloxymethyl iodides or selenides are converted into lactones upon treatment with tributyl-stannane or -germane; the reaction involves highly regioselective and stereoselective ring closure of alkenoyloxymethyl radicals (1).
A. L. J. Beckwith and P. E. Pigou, J. Chem. Soc., Chem. Commun., 1986, 85 DOI: 10.1039/C39860000085
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