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Sustitución oxidativa del organocobre (II) por un radical centrado en el carbono

Yuecheng Weng¹, Yuxuan Jin¹, Jian Wu²

¹State Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China.

Journal of the American Chemical Society

|August 8, 2024

Resumen

Este estudio revela un nuevo mecanismo para las reacciones catalizadas por el cobre. Un complejo de fluoroalquilcobre (III) genera radicales y especies de cobre (II), lo que sugiere una vía de "sustitución oxidativa" para la trifluorometilación.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
La fotocatálisis por fotocatálisis.
Mecanismo de reacción Elucidación.

Sus antecedentes:

Las reacciones de acoplamiento catalizadas por cobre a menudo involucran cobre (II) y radicales alquilo.
El mecanismo preciso de interacción entre estos intermediarios sigue siendo objeto de debate.
Comprender estos mecanismos es crucial para desarrollar sistemas catalíticos eficientes.

Objetivo del estudio:

Para investigar el mecanismo de las reacciones de acoplamiento catalizadas por el cobre de los haluros de alquilo.
Explorar el papel de las especies de cobre (II) y los radicales alquilo en estas transformaciones.
Para dilucidar la vía para la trifluorometilación del enlace C-H catalizado por el cobre.

Principales métodos:

Diseño y síntesis de un complejo de fluoroalquilcobre (III) sensible a la luz visible.
Irradiación del complejo con luz LED azul para inducir la homólisis del enlace cobre-carbono.
Aislamiento y caracterización de un fluoroalquilcobre (II) intermedio.
Estudios computacionales y espectroscópicos para analizar estructuras electrónicas y vías de reacción.

Principales resultados:

El complejo fluoroalquilcobre (III) se somete a homólisis tras la irradiación, formando Cu (II) y radicales centrados en el carbono.
Un isómero cis del complejo se forma a través de la recombinación del radical centrado en el carbono con el intermediario Cu (II).
Se aisló y caracterizó un intermedio fluoroalquilcobre ((II) estable.
Los datos experimentales, computacionales y espectroscópicos apoyan un mecanismo de "sustitución oxidativa".

Conclusiones:

El estudio propone un mecanismo de "sustitución oxidativa" para la interacción entre el organocopio (II) y los radicales centrados en el carbono.
Este mecanismo es probablemente operativo en las reacciones de trifluorometilación de enlaces C-H catalizados por cobre.
Los hallazgos proporcionan una visión significativa de los procesos fundamentales que rigen la catálisis del cobre.

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