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Updated: Dec 9, 2025

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Conocimiento mecanicista de la transferencia concertada de protones y electrones de un complejo Ru (IV) - Oxo: una

Hiroaki Kotani¹, Hinatsu Shimomura¹, Kei Ikeda²

¹Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan.

Journal of the American Chemical Society

|September 14, 2020

Resumen

La oxidación catalizada por rutenio de los derivados del alcohol bencílico cambia de la transferencia concertada de protones-electrones a los mecanismos de transferencia de electrones-protones en presencia de ácidos, lo que influye en las vías de oxidación de enlaces C-H.

Área de la Ciencia:

Química organometálica
Mecanismos de reacción
Catálisis

Sus antecedentes:

La transferencia de electrones acoplados a protones (PCET) es crucial en las reacciones químicas, incluida la oxidación C-H.
La comprensión de los mecanismos PCET es esencial para el diseño de sistemas catalíticos eficientes.
Los complejos de rutenio-oxo son catalizadores conocidos para las reacciones de oxidación.

Objetivo del estudio:

Para elucidar los mecanismos de PCET en la oxidación de derivados de alcohol bencílico por un complejo Ru.
Investigar la influencia de los ácidos de Brønsted en la vía de reacción.
Para determinar el papel de los efectos de isótopos cinéticos y la teoría de Marcus en la comprensión del mecanismo.

Principales métodos:

Análisis cinético de la oxidación del derivado del alcohol bencílico utilizando un complejo de Ru.
Investigación en ausencia y presencia de diferentes concentraciones de ácidos de Brønsted (por ejemplo, TFA).
Medición de los efectos del isótopo cinético (KIE) y los parámetros de activación.

Principales resultados:

La oxidación sin ácido se produce a través de la transferencia concertada de protones-electrones (CPET), mostrando una gran KIE.
La adición de ácidos altera el mecanismo para la transferencia gradual de electrones seguida de la transferencia de protones (ET/PT), evidenciada por un KIE reducido (1.1 con TFA).
El aumento de la concentración de ácido cambia positivamente el potencial de reducción de Ru (IV) (O) e influye en el mecanismo PCET, de acuerdo con la teoría de Marcus.

Conclusiones:

El mecanismo PCET en la oxidación C-H catalizada por Ru es sensible a la concentración de ácido.
Una transición de CPET a ET / PT ocurre con el aumento del ácido, impulsado por cambios en los potenciales redox.
Un mecanismo asíncrono oxidativo de CPET puede operar en una región límite específica de la concentración ácida.

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