In this reaction, the proton acts as the electrophile and water coming from the solvent attacks the sulfinyl group.
Not convinced yet? There are even crystal structures to prove it!
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Studies on highly regio- and stereoselective hydration of 1,2-allenylic sulfoxides
Zhao Fang, Chao Zhou, Chunling Fu and Shengming Ma
Org. Biomol. Chem., 2010, 8, 4554-4561
DOI: 10.1039/C0OB00007H
