[PDF] azo violet synthesis mechanism

Azo violet can be synthesised by reacting 4-nitroaniline with nitrous acid (generated in situ with an acid and a nitrite salt) to produce a diazonium intermediate. This is then reacted with resorcinol, dissolved in a sodium hydroxide solution, via an azo coupling reaction.
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  • What is the mechanism of synthesis of azo dyes?

    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.31 jan. 2020

  • What is the mechanism of azo dye test reaction?

    (e) Azo-Dye Test:
    This test is performed in order to confirm the presence of aromatic amines. Aromatic amines forms a diazonium salts when treated with HNO2. These diazo compounds couple with phenols like ?-naphthols forms an orange azo dye which is insoluble in water.

  • What is the azo bond formation reaction?

    Most aromatic azo compounds are prepared by the reaction of a diazonium salt with an organic substance that contains easily replaced hydrogen atoms. The synthesis of azobenzene from nitrobenzene by treatment with certain oxygen-removing reagents is an example of an alternate method useful for symmetrical azo compounds.
  • Phenol is dissolved in sodium hydroxide solution to give a solution of sodium phenoxide. The solution is cooled in ice, and cold benzenediazonium chloride solution is added. There is a reaction between the diazonium ion and the phenoxide ion and a yellow-orange solution or precipitate is formed.
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