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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
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Complejos de dicobre Cu (I) Cu (I) y Cu (I) Cu (II) en cicloadición azida-alquina catalizada por el cobre
Micah S Ziegler1,2, K V Lakshmi3, T Don Tilley1,2
1Department of Chemistry, University of California , Berkeley, California 94720-1460, United States.
Journal of the American Chemical Society
|April 11, 2017
Resumen
Este estudio detalla un complejo de cobre
Área de la Ciencia:
- Química organometálica
- Catálisis
- Química supramolecular
Sus antecedentes:
- La cicloadición azida-alquina catalizada por cobre (CuAAC) es una reacción vital en la química sintética.
- La comprensión de las vías mecanicistas de CuAAC es crucial para optimizar la eficiencia catalítica.
- Los complejos de dicobre ofrecen propiedades electrónicas únicas para aplicaciones catalíticas.
Objetivo del estudio:
- Investigar el mecanismo de reacción de un complejo de dicopro con p-tolilazida.
- Explorar el papel de los intermediarios bimetálicos en la cicloadición azida-alquina catalizada por el cobre.
- Caracterizar los nuevos complejos de dicobre y sus propiedades redox.
Principales métodos:
- Síntesis y caracterización de los complejos de dicopro μ-alquinilo y μ-triazolido.
- Estudios cinéticos para determinar el orden de la reacción.
- Voltametría cíclica para evaluar el comportamiento redox.
- Espectroscopia de resonancia paramagnética de electrones para el análisis de la estructura electrónica.
Principales resultados:
- Un complejo de dicopro μ-alquinilo reacciona con la p-tolilazida para formar un complejo de dicopro μ-triazolida.
- La transformación sigue la cinética bimolecular, apoyando un mecanismo bimetálico para CuAAC.
- Se sintetizaron y caracterizaron complejos de dicobre redox-activos, revelando una deslocalización de espín inusual en un estado de valencia mixta.
- Los estudios de reactividad sugieren que las vías que involucran solo intermedios de cobre son más probables que las vías de valencia mixta.
Conclusiones:
- El estudio proporciona información clave sobre un mecanismo bimetálico para la cicloadición azida-alquina catalizada por el cobre.
- Se sintetizaron nuevos complejos de dicobre con propiedades electrónicas y redox interesantes.
- Los hallazgos sugieren que el CuAAC probablemente procede a través de productos intermedios de cobre en lugar de especies de valencia mixta.
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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