Synthetic applications of Aryl diazonium Salt

Aryl diazonium salts are prepared by reacting an aromatic primary amine with nitrous acid at a temperature between 0-5 ^oC.

Diazonium salts are very useful intermediates in the synthesis of a number of aromatic compounds. Some of them are as follows.

1. Replacement of Hydrogen:

Synthesis of 1,3,5,-tribromobenzene

2. Replacement by halogen atom:

    Synthesis of chlorobenzene

3. Replacement by Cyano group:

    Synthesis of p-toluinitrile

4. Replacement by hydroxy group:

    Synthesis of o-cresol