CHEM 222 Study Guide - Azo Coupling, Electrophilic Aromatic Substitution, Pasteur Pipette

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Experiment 6: azo dyes: objective: 1 mark. The purpose of this experiment is to prepare the azo dye of methyl red by the diazonium coupling reaction of n,n-dimethylaniline with anthranyl diazonium chloride, which was obtained from the anthranilic acid. Use the melting point test to check if it was indeed methyl red that is produced: introduction: 2 marks. Brief description of the concept/reaction studied azo dyes, electrophilic aromatic substitution. The basic structure of an azo dyes is aromatic group-n=n-aromatic group". Azo group is the name of the structure that has the nitrogen double bond. Azobenzene derivatives have a conjugated pi-electron system, which cause the absorption of different wavelengths of light and is the reason why we witness a colored compound. It is the electron releasing resonance effect that allows for the reaction between the diazonium salt (the electrophile: diazonium cation) and the aryl unit.

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