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Complejos de aluminabenceno-Rh y -Ir: síntesis, estructura y aplicación hacia la borilación catalítica de C-H

Taichi Nakamura¹, Katsunori Suzuki², Makoto Yamashita²

¹Department of Applied Chemistry, Graduate School of Science and Engineering, Chuo University , 1-13-27 Kasuga, Bunkyo-ku, 112-8551 Tokyo, Japan.

Journal of the American Chemical Society

|November 30, 2017

Resumen

Se sintetizaron nuevos complejos metálicos de aluminio-benceno con rodio e iridio. Estos complejos muestran acidez de Lewis, lo que permite reacciones selectivas de boroilación C-H, un avance clave en la química organometálica.

Área de la Ciencia:

Química organometálica
Catálisis
Química del ácido de Lewis

Sus antecedentes:

Los complejos de aluminio-areno están poco explorados en la catálisis.
Los sitios ácidos de Lewis pueden activar sustratos para transformaciones orgánicas.

Objetivo del estudio:

Sintetizar nuevos complejos de aluminio-benceno-rodio y -iridio.
Investiga las propiedades ácidas de Lewis del centro de aluminio.
Explorar el potencial catalítico de estos complejos en la funcionalización C-H.

Principales métodos:

Síntesis de complejos de alumina y benceno.
Análisis estructural mediante difracción de rayos X.
Estudios de interacción ácido-base de Lewis con la 4-dimetilaminopiridina.
Pruebas catalíticas de las reacciones de borilación C-H.

Principales resultados:

Ha sintetizado con éxito complejos de alumina-benceno-rodio y -iridio.
Se confirmó la coordinación del aluminabenceno como un ligando η5-pentadienilo.
Demostró la naturaleza ácida de Lewis del átomo de aluminio.
Se obtiene la borilación α-selectiva de la trietilamina mediante el catalizador de iridio.

Conclusiones:

Los ligandos de aluminio-benceno pueden coordinarse efectivamente con los metales de transición.
El centro de aluminio actúa como un ácido de Lewis proximal, influyendo en la reactividad.
Estos hallazgos abren nuevas vías para el diseño de catalizadores organometálicos ácidos de Lewis.

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