ISSUE:

Can someone explain to me: how and why does the Pummerer rearrangement occur?

Hi,
en.m.wikipedia.org/wiki/Pummerer_rearrangement
Regards

The Pummerer rearrangement is a chemical reaction that involves the transfer of an alkyl or aryl group from a sulfoxide to a nucleophilic substrate, usually an alcohol or an amine, accompanied by the simultaneous oxidation of the sulfoxide to a sulfone.

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The reaction is carried out in the presence of an oxidizing agent such as thionyl chloride or iodine trifluoride. The reaction mechanism begins with the protonation of the sulfoxide by the acid, followed by the formation of a sulfonium ion and the transfer of the alkyl group. or aryl to the nucleophilic substrate. The reaction is highly selective for the transfer of the R group in place of the sulfoxide oxygen atom, leading to the formation of a restart product that is a sulfone derivative. I recommend that you visit the Copisa