Sandmeyer Reaction
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Each of the following three reactions of aromatic diazonium ions is called a Sandmeyer reaction.
Each reaction, overall, is a nucleophilic substitution.
None of the reactions, however, occurs in the absence of copper (I) ion, which is a reducing agent. The mechanism of Sandmeyer reactions is not fully understood.
- Gamini Gunawardena from the OChemPal site (Utah Valley University)