Complexation fo BF3 etherate to the epoxide oxygen of sulfone 1 triggers a reaction cascade that transforms the unreactive dienophile 1 into a diastereoisomeric pair of reactive oxosulfoxonium salts(γ-sultinium ions 6 and 7), corresponding to an activation occurring at five-bond distance from the reactive site.
J. Zanon, V. Lucchini, L. Pasquato and O. De Lucchi, Chem. Commun., 1996, 709 DOI: 10.1039/CC9960000709
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