7.2.2.2 Sandmeyer Reaction

This method provides an effective route for the preparation of aromatic bromides and chlorides. Addition of cold aqueous solution of diazonium chloride to a solution of CuCl in HCl medium gives a sparingly soluble complex which is separated and heated to give aryl chloride or bromide by decomposition.

Examples:

7.2.3 Replacement by Aromatic Carbon

A number of methods lead to arylation of aromatic carbon by diazonium salts.

7.2.3.1 Pschorr Reaction

This reaction describes the synthesis of phenanthrene and its derivatives via diazotation followed by intramoecular cyclization using copper powder.