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Dyes

Dyes. Dr. Clower. Food Additives, cont. Coloring Natural colors Synthetic dyes Why add coloring to food? Regulation Structure. Mauve. Perkin’s idea: Mauveine. Triphenylmethyl Dyes. Pararosaniline , malachite green, crystal violet. Azo Dyes. Aniline Yellow Bismarck Brown.

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Dyes

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  1. Dyes Dr. Clower

  2. Food Additives, cont. • Coloring • Natural colors • Synthetic dyes • Why add coloring to food? • Regulation • Structure

  3. Mauve • Perkin’s idea: • Mauveine

  4. Triphenylmethyl Dyes • Pararosaniline, malachite green, crystal violet

  5. Azo Dyes • Aniline Yellow • Bismarck Brown

  6. Azo Dyes • Methyl orange • Orange II • Para red • Amaranth red

  7. Azo Dyes • Preparation: • Diazonium salt and activated aromatic compound • Diazotization step • Coupling step

  8. Assignment • Draw a mechanism for the coupling of aniline with a diazonium ion. Pay close attention to regiochemistry (i.e. will the coupling occur ortho, meta, or para?) • Draw the two aromatic compounds that would be used to synthesize Para red.

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