[PDF] azo dye synthesis mechanism

To complete the synthesis of the azo dye, the diazonium salt reacts as an electrophile with a coupling component is rich in electrons (a phenol or an aniline). This reaction was carried out by an electrophilic aromatic substitution mechanism.
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  • What is the process of dyeing with azo dyes?

    Introduction: Azoic dyes are not ready-made dyes but are produced by reaction of two components-Diazocomponent or Base/Salt and Coupling component (Naphthol). Dye formation in Fibre occurs on the basis of coupling reaction.

  • What is the mechanism of diazonium coupling?

    The mechanism involves an initial attack of coupling agent (phenols or anilines) on an electrophilic diazonium ion, followed by loss of a proton. The product is normally a trans-diazo compound rather than cis. Diazo compounds are used as pH indicators and dyes.

  • How is azo dye methyl orange synthesized?

    One important group is known as the azo dyes, which are named after their unusual N=N, azo, functional group. In this experiment, you will synthesize methyl orange from sulfanilic acid and N,N-dimethylaniline using a diazonium coupling reaction, a common reaction for treating an aliphatic amine to yield a carbocation.
  • In the azo dye test, a primary aromatic amine reacts with nitrous acid, which is generated in situ by the reaction of sodium nitrite with hydrochloric acid (HCl) at 0–5°C to produce a diazonium salt.
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