Preparation of Diazonium Salts

Benzenediazonium chloride is prepared by reacting aniline with nitrous acid (itself generated in situ from NaNO2 + HCl) at a low temperature of 273-278 K -- keeping the temperature this low is essential, since the diazonium salt decomposes readily as temperature rises. This low-temperature reaction of a primary AROMATIC amine with nitrous acid is exactly the DIAZOTISATION …