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Elucidación del mecanismo de reducción de la transferencia de electrones de los endoperoxidos de antraceno

Robert L Donkers¹, Mark S Workentin

¹Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7.

Journal of the American Chemical Society

|February 12, 2004

Resumen

Este estudio investiga la reducción de endoperoxidos, revelando un mecanismo disociativo de transferencia de electrones. Diferentes vías de reducción producen productos distintos, siendo la reorganización O-neofilo una vía clave para el DPA-O2.

Área de la Ciencia:

La electroquímica es electroquímica.
Química orgánica es la química orgánica.
Química Física es la química física.

Sus antecedentes:

Los endoperóxidos son peróxidos cíclicos con una reactividad única.
La transferencia disociativa de electrones (ET) es una vía de reacción crucial en la electroquímica orgánica.
Comprender los mecanismos de reducción de los endoperoxidos es vital para las aplicaciones sintéticas.

Objetivo del estudio:

Para investigar las reducciones homogéneas y heterogéneas de 9,10-difenil-9,10-epidioxyanthracene (DPA-O2) y 9,10-dimethyl-9,10-epidioxyanthracene (DMA-O2).
Para determinar los parámetros termoquímicos utilizando el modelo de Savéant para la transferencia disociativa de electrones.
Para aclarar la distribución del producto y los mecanismos de reacción bajo diferentes condiciones de reducción.

Principales métodos:

Investigación electroquímica de DPA-O2 y DMA-O2 en condiciones tanto homogéneas como heterogéneas.
Aplicación del modelo de Savéant para determinar los parámetros termoquímicos clave (E°, ΔG‡, energías de disociación de enlaces).
Análisis del producto para identificar y cuantificar las especies formadas durante la reducción.

Principales resultados:

Tanto el DPA-O2 como el DMA-O2 se someten a ET disociativo del enlace O-O, formando aniones radicales distónicos.
La reducción de DMA-O2 produce cuantitativamente DMA-(OH) 2 a través de un proceso de dos electrones.
La reducción de DPA-O2 produce DPA-(OH) 2, pero compite con una reorganización de O-neofilo que forma un radical de carbono, que puede reducirse aún más a PPA.

Conclusiones:

Los productos de reducción de los endoperoxidos dependen del modo de reducción (homogéneo/heterogéneo) y del potencial.
Se propone un mecanismo unificado para la reducción de DPA-O2, destacando la vía de reorganización O-neofilo.
El estudio proporciona información valiosa sobre el comportamiento electroquímico y las vías de reacción de los endoperoxidos.

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