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. 2012 Jan 31;18(10):2987–2997. doi: 10.1002/chem.201102861

Scheme 9.

Scheme 9

a) Intermolecular and b) intramolecular mechanisms for the inter-conversion of axial and equatorial isomers of oxodisulfonium ion 27-R/S. The intermolecular mechanism is depicted as an SN2 process for simplicity, although it is possible it could involve addition–elimination steps via a sulfurane intermediate.