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Hidrosilación bifásica en líquidos iónicos: un proceso establecido para la implementación industrial.

Tilmann J Geldbach1, Dongbin Zhao, Nikola C Castillo

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Journal of the American Chemical Society
|July 27, 2006
PubMed
Resumen

Los líquidos iónicos como [C(4) py][BF(4)] facilitan la hidrosilación bifásica del 1-hexadeceno. Los catalizadores de platino, en particular K(2) PtCl ((4) y Pt ((PPh ((3)) ((4), muestran una actividad y estabilidad óptimas para esta reacción.

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Área de la Ciencia:

  • La catálisis de la catálisis.
  • Química organometálica Química orgánica de los metales.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • La hidrosilación es una reacción clave en la química de la silicona.
  • Los líquidos iónicos ofrecen propiedades únicas de disolvente para la catálisis.
  • Los catalizadores de platino son ampliamente utilizados, pero pueden sufrir de desactivación y lixiviación.

Objetivo del estudio:

  • Para investigar la hidrociliación bifásica del 1-hexadeceno utilizando el siloxano B9800.
  • Para identificar líquidos iónicos óptimos y precatalizadores de platino para esta reacción.
  • Comprender la influencia de los parámetros de reacción e impurezas en el rendimiento catalítico.

Principales métodos:

  • Cribado de varios líquidos iónicos, incluidos [C(4) py][BF(4) ] y [C(4) -3-pic][BF(4) ].
  • Evaluación de los precatalizadores de platino, como el K ((2)) PtCl ((4) y Pt ((PPh ((3)) ((4).
  • Variación sistemática de los parámetros de reacción y evaluación de los efectos de las impurezas (oxígeno, agua, cloruro).

Principales resultados:

  • [C(4) py][BF(4) ] y [C(4)-3-pic][BF(4) ] demostraron el mejor equilibrio entre la actividad catalítica y la retención.
  • K ((2) PtCl ((4) produjo la mayor actividad, mientras que Pt ((PPh ((3)) ((4) ofreció una estabilidad y reciclabilidad superiores.
  • La reacción podría proceder a través de catalizadores de nanopartículas homogéneos o solubles, sin que ninguna estrategia de estabilización mejore el rendimiento.

Conclusiones:

  • Los líquidos iónicos específicos y los precatalizadores de platino pueden mediar efectivamente la hidrociliación bifásica del 1-hexadeceno.
  • Las condiciones de reacción y las impurezas tienen un impacto significativo en el rendimiento del catalizador y la especiación (homogéneo vs. nanopartícula).
  • Una mayor estabilización de los catalizadores de nanopartículas en este sistema no mejoró la eficiencia catalítica.