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Reference.org
Pummerer rearrangement
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<p>The Pummerer rearrangement is an <a href="/facts/Organic_reaction/SESmeGWm">organic reaction</a> whereby an <a href="/facts/Alkyl/vmEk8X4v">alkyl</a> <a href="/facts/Sulfoxide/Stk3Vnj9">sulfoxide</a> <a href="/facts/Rearrangement_reaction/B1XTteIJ">rearranges</a> to an α-<a href="/facts/Acyloxy/1vRPrmUX">acyloxy</a>–<a href="/facts/Thioether/GdyEz43f">thioether</a> (mono<a href="/facts/Thioacetal/bpkzM6mo">thioacetal</a>-ester) in the presence of <a href="/facts/Acetic_anhydride/hGxHam3M">acetic anhydride</a>. </p> <p>The stoichiometry of the reaction is: </p> RS(O)CHR'2 + Ac2O → RSC(OAc)R'2 + AcOH