Reaction of (R)-(+)-[αα-2H2]dibenzyl sulphoxide with PhICl2 or bromine in pyridine to afford preferentially one of the four possible diastereoisomeric α-halogeno-sulphoxides is highly stereoselective; the corresponding α-halogenosulphones are optically active, thus indicating that asymmetric induction is operating.
M. Cinquini and S. Colonna, J. Chem. Soc., Chem. Commun., 1974, 769 DOI: 10.1039/C39740000769
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