Formation of Diazonium Salts under Anhydrous Conditions

Formation of Diazonium Salts under Anhydrous Conditions... 

Oiazonium Salt Formation. The aromatic amino group of aminophenols can be converted to the diazonium salt using sodium nitrite in aqueous acid, although difficidties may be encoimtered when the aminophenol is of low solubiUty or easily oxidized Crystalline diazonium salts have been isolated using the hydrochloride or sidfate of the appropriate aminophenol under anhydrous conditions. Such diazo derivatives find extensive use in the dye industry (27,28). 

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