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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Síntesis de un radical carbeno-estabilizado (difosfa) aminilico y su oxidación y reducción a especies no clásicas de

Etienne A LaPierre¹, Lara K Watanabe², Brian O Patrick³

¹Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada.

Journal of the American Chemical Society

|April 17, 2023

Resumen

Hemos sintetizado un nuevo radical PNP estabilizado por carbenos heterocíclicos. Este radical exhibe propiedades redox únicas, formando cationes de nitrenio flexibles y complejos de amida versátiles.

Área de la Ciencia:

Química organometálica
La Química Radical
Química del grupo principal

Sus antecedentes:

Los radicales tripnictógenos son cruciales para comprender el enlace y la reactividad en los elementos principales del grupo.
Los radicales estabilizados ofrecen propiedades electrónicas y estructurales únicas para nuevas transformaciones químicas.
Los carbenos N-heterocíclicos (NHC) son ligandos versátiles que estabilizan las especies reactivas.

Objetivo del estudio:

Síntesis y caracterización de un nuevo radical PNP acíclico estabilizado por carbenos.
Investigar el comportamiento redox y las propiedades electrónicas del radical PNP sintetizado.
Explorar la química de coordinación y la diversidad estructural de sus especies derivadas.

Principales métodos:

Una reducción de siete electrones de cloruro de hexaclorofosfeno.
Caracterización espectroscópica (NMR, EPR) y cristalografía de rayos X.
Estudios computacionales (DFT) y análisis termodinámico experimental.

Principales resultados:

Síntesis exitosa del radical PNP CAAC^Me con un marco conjugado.
Se ha demostrado una fácil oxidación de un electrón y reducción a especies de nitreno [5]⁺ y amida [6]^-.
Flexibilidad conformacional observada en el catión nitrenio [5]⁺ y diversos modos de coordinación de la amida [6]^-.

Conclusiones:

El nuevo radical PNP exhibe una actividad redox única y plasticidad estructural.
El catión de nitreno muestra un equilibrio inusual entre las geometrías en forma de W y lineal.
El ligando de amida demuestra una química de coordinación versátil con múltiples sitios básicos de Lewis.

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