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Chemical Properties of Amines

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Chemical Properties of Amines

  • Hoffmann's exhaustive alkylation: R—NH₂ + R—X → successively gives 2°, 3° amines, and finally tetraalkyl ammonium halide (R₄N⁺X⁻).
  • Hoffmann elimination: Quaternary ammonium hydroxide on heating with moist Ag₂O gives an alkene + 3° amine + H₂O.
  • Acylation: Amines + CH₃COCl (in pyridine) → N-substituted amide + HCl.
  • Carbylamine reaction: R—NH₂ + CHCl₃ + 3KOH → R—NC (alkyl isocyanide) + 3KCl + 3H₂O.
  • Reaction with HNO₂ (273–278 K): Aliphatic 1° amine → R—OH + N₂ + HCl; aromatic 1° amine → diazonium salt (C₆H₅—N⁺≡NCl⁻).
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