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Cicloadiciones autocatalíticas de alquinos: evidencia para la catálisis coloidal Pt

Rowshan Ara Begum¹, Nripen Chanda, T V V Ramakrishna

¹Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, USA.

Journal of the American Chemical Society

|September 30, 2005

Resumen

Los compuestos que contienen platino reaccionan con el difenilacetileno para formar nuevos hidrocarburos aromáticos policíclicos. El platino coloidal, generado in situ, cataliza estas reacciones de acoplamiento, acelerando el proceso.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
La catálisis de la catálisis.
Química orgánica sintética y orgánica.

Sus antecedentes:

Los platinaciclos de cuatro y cinco miembros son compuestos organometálicos que contienen platino.
Estos compuestos pueden someterse a reacciones con alquinos, lo que lleva a la formación de nuevos enlaces carbono-carbono.

Objetivo del estudio:

Para investigar la reacción de los platinaciclos con el difenilacetileno.
Para identificar los productos de estas reacciones y entender el mecanismo de reacción, incluyendo cualquier efecto catalítico.

Principales métodos:

Tratamiento de platinaciclos (L2Pt(1,8-naftalendiyl) y L2Pt(1,12-triphenylendiyl)) con el exceso de difenilacetileno (PhCCPh) a altas temperaturas (120-150°C).
Análisis de los productos de reacción utilizando técnicas espectroscópicas y analíticas.
Investigación de la cinética de la reacción y identificación de las especies catalíticas.

Principales resultados:

Formación de los productos de acoplamiento: 1,2-difenilacenanaftaleno y 4,5-difenilbenzo[e]pireno.
El aislamiento de un complejo de alquina, L2Pt(eta2-PhCCPh), como un subproducto.
Observación de las velocidades de reacción aceleradas atribuidas a la catálisis con platino coloidal.

Conclusiones:

Los platinaciclos reaccionan con el difenilacetileno para producir hidrocarburos aromáticos policíclicos y complejos de alquinos.
La reacción es autocatalítica, facilitada por el platino coloidal formado durante la reacción.
Este estudio aclara una nueva ruta sintética y destaca el papel de las nanopartículas de platino en la catálisis.

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