Diazotization

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diazotization

[dī‚az·ət·ə′zā·shən]
(organic chemistry)
Reaction between a primary aromatic amine and nitrous acid to give a diazo compound. Also known as diazo process.

Diazotization

 

the reaction of preparing diazo compounds by the action of nitrous acid (or its derivatives) on primary amines in the presence of inorganic acids (HCl, H2SO4, or HNO3) at 0°-5°C. The diazotization of aromatic amines to yield diazonium salts is the most common—for example, aniline is diazotized to phenyldiazonium chloride:

In organic synthesis, diazotization is used extensively to make various aromatic compounds through the diazonium salt, as well as to synthesize dyes, particularly azo dyes.