Question
Explain the following reaction with a suitable example.
Sandmeyer reaction
Sandmeyer reaction
✓
Answer
In this reaction, arene diazonium salts undergo a nucleophilic substitution reaction. The reaction involves displacement of the diazo group by – Cl/– Br/ –CN atom. The reaction can be represented as,
$Ar - N _2^{+} X ^{-} \stackrel{ CuX / HX }{\longrightarrow} Ar - X + N _2( X =- Cl ,- Br )$
$Ar - N _2^{+} X ^{-} \stackrel{ CuCN / KCN }{\longrightarrow} Ar - CN + N _2$
e.g. Preparation of cyanobenzene from benzene diazonium chloride.
$Ar - N _2^{+} X ^{-} \stackrel{ CuX / HX }{\longrightarrow} Ar - X + N _2( X =- Cl ,- Br )$
$Ar - N _2^{+} X ^{-} \stackrel{ CuCN / KCN }{\longrightarrow} Ar - CN + N _2$
e.g. Preparation of cyanobenzene from benzene diazonium chloride.
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