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Trirrádicos de quinolina: un estudio de reactividad

Raghavendhar R Kotha1, Ravikiran Yerabolu1, Mohammad Sabir Aqueel1

  • 1Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States.

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Los trirrádicos de quinolina protonados reaccionan con el disulfuro de dimetilo a través de un nuevo mecanismo de dos pasos, que implica la transferencia de protones y luego la abstracción del átomo de hidrógeno, formando abundantes cationes radicales de disulfuro de dimetilo.

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Área de la Ciencia:

  • Química Física
  • Química orgánica
  • Espectrometría de masas

Sus antecedentes:

  • Los radicales protonados basados en quinolina son intermediarios clave en varios procesos químicos.
  • La comprensión de su reactividad en fase gaseosa es crucial para el esclarecimiento del mecanismo de reacción.

Objetivo del estudio:

  • Investigar el mecanismo de reacción en fase gaseosa de los radicales mono-, bi- y triradicales protonados basados en quinolina con disulfuro de dimetilo (DMDS).
  • Para elucidar la inesperada formación de abundantes cationes radicales DMDS de los triradicales.

Principales métodos:

  • Estudios de reactividad en fase gaseosa con un espectrómetro de masas de trampa de iones cuádrupolo lineal.
  • Cálculos químicos cuánticos para apoyar los mecanismos propuestos.
  • Estudios en los que se utilizaron triradicales deuterados y metilados.

Principales resultados:

  • Los monorrádicos y birrádicos mostraron la abstracción de tiometilo esperada.
  • Los trirrádicos produjeron inesperadamente abundantes cationes radicales de DMDS.
  • Se propuso y apoyó un nuevo mecanismo de dos pasos que implica la transferencia de protones y la subsiguiente abstracción de átomos de hidrógeno.

Conclusiones:

  • El mecanismo de reacción de los trirrádicos difiere significativamente de los monorrádicos y birrádicos.
  • La transferencia de protones seguida de la abstracción del átomo de hidrógeno explica la distribución del producto observada.
  • Las propiedades radicales como la afinidad de protones y la afinidad de electrones gobiernan la vía de reacción.