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Bis[bis]trimethylsilyl (amino]silene, un compuesto de silicio bivalente inestable, es un compuesto de silicio
Gyu-Hwan Lee1, Robert West, Thomas Müller
1Department of Chemistry, Hannam University, Taejon 305-761, Korea.
Journal of the American Chemical Society
|July 3, 2003
Resumen
Los investigadores sintetizaron un nuevo compuesto de silicio, bis ((trimethylsilyl) silileno, a través de la reducción. Este silileno inestable se caracterizó utilizando espectroscopia de RMN a baja temperatura y reaccionó con alcoholes, confirmando su naturaleza reactiva.
Área de la Ciencia:
- Química del organosilicio Química del organosilicio
- Síntesis a baja temperatura.
- Caracterización espectroscópica de la caracterización espectroscópica.
Sus antecedentes:
- Los sililenos son análogos de silicio de los carbenos con silicio divalente.
- La síntesis y caracterización de compuestos de silicio de baja coordinación es un reto debido a su inherente inestabilidad.
- Estudios anteriores se han centrado en los análogos de germanio y estaño, dejando a las contrapartes de silicio menos exploradas.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo compuesto de silene, el bis ((trimethylsilyl) silylene.
- Para investigar la estabilidad y la reactividad de este silileno a bajas temperaturas.
- Para comparar las propiedades del silileno de silicio con sus congéneres más pesados del grupo 14.
Principales métodos:
- Reducción de un precursor de bromuro de silicio utilizando grafito de potasio a bajas temperaturas (-78 °C).
- Espectroscopia de resonancia magnética nuclear (RMN) en estado de solución, específicamente RMN 29Si, para la caracterización.
- Experimentos de captura a baja temperatura con alcoholes (metanol y fenol).
Principales resultados:
- La síntesis exitosa del sileno objetivo, bis ((trimethylsilyl) sileno, denotado como 1.
- El compuesto 1 exhibe inestabilidad, pero es susceptible de estudio en solución a bajas temperaturas.
- El desplazamiento químico de 29Si NMR de 1 se midió en 223,9 ppm, alineándose con los cálculos teóricos.
- La reacción con el metanol y el fenol produjo los productos de captura esperados, [(Me3Si) 2N]2Si(H) O.R.
Conclusiones:
- La síntesis de bis ((trimethylsilyl) sileno se puede lograr a través de métodos reductivos.
- El compuesto es un intermedio reactivo, que exhibe la química silileno característica.
- La espectroscopia de RMN a baja temperatura proporciona un método viable para el estudio de tales especies de silicio inestables.
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