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Clivado oxidativo del enlace de CN en Al (I)
Terry Chu1, Sergei F Vyboishchikov2, Bulat M Gabidullin3
1Department of Chemistry, Brock University , 1812 Sir Isaac Brock Way, St. Catharines, Ontario Canada L2S 3A1.
Journal of the American Chemical Society
|June 14, 2017
Resumen
La reacción entre una guanidina cíclica y un compuesto de aluminio (I) rompe inesperadamente el enlace C-N, formando un nuevo complejo de amida de aluminio (III). Este descubrimiento ofrece nuevos conocimientos sobre los mecanismos químicos del aluminio.
Área de la Ciencia:
- Química orgánica de los metales
- Química del grupo principal
- Mecanismos de reacción
Sus antecedentes:
- Los compuestos de aluminio son reactivos y menos comprendidos que sus contrapartes trivalentes.
- Las guanidinas cíclicas ofrecen una reactividad única debido a su estructura electrónica.
- Comprender las nuevas activaciones de enlaces es crucial para la química sintética.
Objetivo del estudio:
- Investigar la reacción entre una guanidina cíclica específica (TolNSIMe) y un complejo de aluminio (NacNacAl).
- Para aclarar el mecanismo de la escisión del enlace múltiple C-N en esta reacción.
- Para caracterizar el producto de amida de aluminio resultante.
Principales métodos:
- Reacción de TolNSIMe con NacNacAl.
- Caracterización del producto mediante técnicas espectroscópicas y analíticas.
- Cálculos de la teoría funcional de la densidad (DFT) para modelar la vía de reacción.
Principales resultados:
- La reacción resultó en la escisión sin precedentes del enlace múltiple C-N.
- Se sintetizó una nueva amida Al ((III) ligada a carbenos, NacNac'Al ((NHTol) ((SIMe).
- Los cálculos de DFT indicaron un mecanismo bimolecular que involucra la desprotonación del ligando NacNac.
Conclusiones:
- La reacción demuestra una nueva vía para la activación de enlaces C-N por complejos de aluminio.
- Los hallazgos amplían la reactividad conocida de los compuestos del grupo principal de baja valencia.
- El estudio proporciona información mecanicista sobre las complejas transformaciones del organoaluminio.
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