In organic chemistry, an azo coupling is an organic reaction between a diazonium compound (R−N≡N+) and another aromatic compound that produces an azo compound (R−N=N−R’). In this electrophilic aromatic substitution reaction, the aryldiazonium cation is the electrophile and the activated carbon (usually from an arene which is called coupling agent) act as a nucleophile.[1] In most cases, including the examples below, the diazonium compound is also aromatic.
https://en.wikipedia.org/wiki/Azo_coupling
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