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Dimetilcalcio y sus derivados

Benjamin M Wolf1, Christoph Stuhl1, Cäcilia Maichle-Mössmer1

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen , Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|January 13, 2018
PubMed
Resumen
Este resumen es generado por máquina.

En este estudio se informa de la síntesis de dimetilcalcio [CaMe2]n a través de la metástasis de la sal. El compuesto exhibe una reactividad única, formando nuevos complejos de organocalcio y sirviendo como precursor de los reactivos pesados de Grignard.

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Área de la Ciencia:

  • Química organometálica
  • Química del calcio
  • Química del grupo principal

Sus antecedentes:

  • Los compuestos de organocalcio son menos explorados en comparación con sus contrapartes de metales alcalinos y de tierra alcalina.
  • Comprender la síntesis y la reactividad de las especies de organocalcio es crucial para desarrollar nuevas metodologías sintéticas.
  • El dimetilcalcio [CaMe2]n es un precursor clave para acceder a diversos complejos organometálicos basados en el calcio.

Objetivo del estudio:

  • Para sintetizar y caracterizar el dimetilcalcio [CaMe2]n.
  • Investigar la reactividad de [CaMe2]n con varios reactivos, incluidos haluros, ligandos voluminosos y ácidos de Lewis.
  • Explorar la formación de nuevos compuestos de organocalcio y reactivos pesados de Grignard.

Principales métodos:

  • Reacción de metatesis de sal entre el calcio bis ((trimetilsililamida) homoleptico y el metillitio.
  • Aislamiento y caracterización del dimetilcalcio [CaMe2]n mediante microanálisis, RMN y espectroscopia FTIR.
  • Estudios de cristalización para determinar la estructura de los aductos y complejos de calcio.

Principales resultados:

  • Aislamiento exitoso de dimetilcalcio amorfo de rayos X [CaMe2]n en buenos rendimientos y pureza.
  • La cristalización de [CaMe2]n a partir de soluciones enfriadas de THF produjo el adducto heptametálico [thf) 10Ca7Me14 .
  • Síntesis de los primeros compuestos de Grignard pesados caracterizados cristalográficamente con grupos metilo, incluidos los complejos diméricos y trinucleares.
  • Formación de complejos monoméricos con funcionalidades terminales Ca-CH3 y complejos alcóxidos diméricos.
  • Preparación del compuesto tetrametilgalato [Ca ((GaMe4) 2) n mediante reacción con GaMe3.

Conclusiones:

  • El dimetilcalcio [CaMe2]n es un precursor versátil para la síntesis de una serie de compuestos organocalcicos nuevos.
  • El estudio proporciona acceso a los primeros compuestos de Grignard pesados caracterizados cristalográficamente con ligandos de metilo.
  • La reactividad de [CaMe2]n destaca su potencial en la síntesis organometálica y el desarrollo de nuevos reactivos a base de calcio.