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Los catalizadores de metales comunes para la borilación fotoquímica de C-H que utilizan la cooperatividad metal-metal
Thomas J Mazzacano1, Neal P Mankad
1Department of Chemistry, University of Illinois at Chicago , 845 West Taylor Street, Chicago, Illinois 60607, United States.
Journal of the American Chemical Society
|October 1, 2013
Resumen
Nuevos catalizadores de cobre-hierro y zinc-hierro permiten la borilación C-H, reemplazando a los costosos metales nobles. El mejor catalizador es reutilizable y funciona eficientemente bajo luz, mostrando una promesa para una síntesis química más ecológica.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- La catálisis es la catálisis.
- Química Sostenible y Sustentable.
Sus antecedentes:
- La borilación C-H es una transformación crucial en la síntesis orgánica.
- Los métodos tradicionales se basan en costosos y escasos catalizadores de metales nobles.
- El desarrollo de catalizadores metálicos abundantes en la tierra es altamente deseable.
Objetivo del estudio:
- Desarrollar nuevos catalizadores heterobimetálicos para la borilación C-H.
- Para utilizar metales abundantes en la tierra como el cobre (Cu) y el hierro (Fe).
- Explorar la activación fotoquímica para mejorar la actividad catalítica.
Principales métodos:
- Síntesis y caracterización de los complejos heterobimetálicos Cu-Fe y Zn-Fe.
- Evaluación de la actividad catalítica en la borilación C-H de sustratos de areno.
- Optimización de la reacción fotoquímica y estudios de reutilización del catalizador.
- Estudios de reactividad estequiométrica para elucidar el mecanismo catalítico.
Principales resultados:
- Se han identificado eficientes catalizadores heterobimetálicos Cu-Fe y Zn-Fe para la borilación de C-H.
- El catalizador óptimo, (IPr) Cu-FeCp(CO) 2, demostró una alta actividad (5 mol% de carga) bajo condiciones fotoquímicas.
- El catalizador exhibió una excelente reutilización con una pérdida mínima de actividad.
- Una variedad de sustratos de areno fueron borilados con éxito.
- Los estudios de mecanismo revelaron la cooperatividad metal-metal y los procesos organometálicos bimetálicos.
Conclusiones:
- Los complejos hetero-metálicos Cu-Fe y Zn-Fe ofrecen una alternativa sostenible a los catalizadores de metales nobles para la borilación de C-H.
- La activación fotoquímica mejora la eficiencia de estos catalizadores metálicos que abundan en la tierra.
- Los hallazgos destacan el potencial de la cooperación metal-metal en el diseño de nuevos sistemas catalíticos.
![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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