What is diazo coupling? Write the reaction for the preparation of Cong

Question

What is diazo coupling? Write the reaction for the preparation of Congo red dye using this reaction.

22 Jan 2021

Answer :

Word Count : 339

Diazo coupling (azo coupling): The electrophilic aromatic substitution reaction of a diazonium cation with another aromatic ring to form a diazo compound.

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Diazo coupling reaction of the phenyl diazonium cation (PhN₂⁺; shown in red) with phenol (PhOH; shown in blue) gives (E)-4-(phenyldiazenyl)phenol, a diazo compound.

Congo Red is an azo dye formed from the coupling of benzidine HCl and Na napthionate.

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