Radical induced cyclisations of unsaturated sulfones by the endo-5-exo- and the exo-5-exo-ipso-modes are described. Thus the unsaturated allylic sulfones 4, 6 and 8 underwent cyclisation to the cyclopentyl sulfones 5, 7, and 9 and 10 respectively, while the unsaturated vinylic sulfones 14 and 15 were isomerised to the cyclopentylmethyl sulfones 17 and 18 respectively.
I. W. Harvey and G. H. Whitham, J. Chem. Soc., Perkin Trans. 1, 1993, 185 DOI: 10.1039/P19930000185
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