Functionalisation of the 6,7-double bond in the novel bicyclic sulphone, 3-thiabicyclo[3.2.0]hept-6-ene 3,3-dioxide, followed by thermal extrusion of SO2, allows direct entry into seven-membered ring systems via a Cope rearrangement of the resulting cis-1,2-divinyl intermediates.
R. A. Aitken, J. I. G. Cadogan, I. Gosney, B. J. Hamill and L. M. McLaughlin, J. Chem. Soc., Chem. Commun., 1982, 1164 DOI: 10.1039/C39820001164
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