As a consequence of the exo-anomeric effect, and in contrast to their β-anomers, α-thioglycosides undergo stereoselective oxidation to give very predominantly the R-sulfoxides, as revealed by X-ray crystallography.
D. Crich, J. Mataka, S. Sun, D. J. Wink, K.-C. Lam and A. L. Rheingold, Chem. Commun., 1998, 2763 DOI: 10.1039/A804126A
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