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Transfer of 18O from [18O]-5 to oxathiane-S-oxides 2 and 4: a) and b) pre-activation of diphenyl sulfoxide (2.8 equiv) with Tf2O (1.4 equiv). c) Pre-activation of oxathiane-S-oxide 2 with Tf2O (1.1 equiv) before addition of [18O]-diphenyl sulfoxide (2.2 equiv).
