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An azo coupling is an organic reaction between a diazonium compound and an aniline or a phenol. The reaction product is an azo compound. In this reaction the diazonium salt is an electrophile and the activated arene a nucleophile in an electrophilic aromatic substitution. Azo couplings are important in the production of dyes such as methyl red and pigment red 170.
Further reading
- J. L. Hartwell and Louis F. Fieser. "Coupling of o-tolidine and Chicago acid". Org. Synth.; Coll. Vol. 2: 145.
- H. T. Clarke and W. R. Kirner. "Methyl red". Org. Synth.; Coll. Vol. 1: 374.
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