Eliminación de Hofmann
R3N(CH3)+ + OH− → alkene + R3N + H2O
Descripción general
The Hofmann elimination converts a quaternary ammonium salt to an alkene, amine, and water upon heating with base. Unlike E2 elimination, Hofmann elimination favors the less substituted alkene (anti-Zaitsev). This reaction was historically used to determine amine structures by exhaustive methylation and elimination.
Participantes
| Rol | Sustancia | Coeficiente | Estado |
|---|---|---|---|
| Producto | Agua H₂O | 1 | (l) |
Ejemplo cotidiano
Hofmann elimination was crucial in determining the structures of complex alkaloids like morphine and quinine before modern spectroscopy.
Importancia industrial
Aunque en gran medida reemplazada por métodos espectroscópicos para la determinación de estructuras, la eliminación de Hofmann sigue siendo útil en síntesis de compuestos nitrogenados especializados.
Propiedades
- Tipo
- Orgánica
- Reversible
- No
- Energía
- Exotérmico
- ΔH
- -40,0 kJ/mol
- Catalizador
- Ag₂O (for quaternary salt formation)
Reacciones relacionadas
Preguntas frecuentes
What is the equation for Eliminación de Hofmann?
The balanced equation is: R₃N(CH₃)⁺ + OH⁻ → alkene + R₃N + H₂O.
What type of reaction is Eliminación de Hofmann?
Eliminación de Hofmann is a orgánica reaction.
Is Eliminación de Hofmann exothermic or endothermic?
Eliminación de Hofmann is exothermic (releases energy). The enthalpy change (ΔH) is -40.0 kJ/mol.
What conditions are needed for Eliminación de Hofmann?
This reaction requires a catalyst (Ag₂O (for quaternary salt formation)).