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[12]Anula las anulaciones.

Matthew N Gard1, Matthew K Kiesewetter, Richard C Reiter

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.

Journal of the American Chemical Society
|November 17, 2005
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores generaron varios isómeros de [12]annulyne, un análogo deshidroactivo del benceno. Estos compuestos, sensibles al oxígeno, pueden reducirse a dianiones estables y aromáticos, revelando señales únicas de RMN de protones debido a las interacciones de cationes.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Estudios de aromaticidad Estudios de aromaticidad
  • Síntesis de las anulenas.

Sus antecedentes:

  • El análogo deshidroactivo del benceno, el o-benceno ([6]annulyne), existe como un solo isómero.
  • La síntesis y las propiedades de los deshidroanulenos más grandes siguen siendo menos exploradas.
  • La comprensión de los isómeros de annuleno es crucial para sondear la aromaticidad y la estructura electrónica.

Objetivo del estudio:

  • Para sintetizar y caracterizar varios isómeros de [12]annulyne.
  • Para investigar las propiedades electrónicas y la estabilidad de estos isómeros [12]annulyne.
  • Para explorar el comportamiento de [12]annulynes y sus formas reducidas.

Principales métodos:

  • Autocondensación de 1,5-hexadiina mediante el uso de tert-butóxido de potasio.
  • Deshidrohalogenación completa del hexabromociclododeceno.
  • 1H espectroscopia de RMN para analizar los efectos de la corriente de anillo y las resonancias de protones.
  • Reducción electroquímica para formar dianiones.

Principales resultados:

  • Dos isómeros de [12]anulina (3,11-di-trans y 5,9-di-trans) fueron sintetizados a través de la autocondensación, exhibiendo débiles corrientes de anillo paratrópicas y sensibilidad al oxígeno.
  • Un tercer isómero, menos estable (3,9-di-trans-[12]annulyne) se obtuvo a través de la deshidrohalogenación.
  • Ambos isómeros sintetizados podrían reducirse a sus respectivos dianiones diatrópicos estables.
  • Una estrecha asociación entre los cationes de potasio y los orbitales p(y) de alquinos causó resonancias de RMN de protones de campo inusualmente bajo.

Conclusiones:

  • Se pueden sintetizar múltiples isómeros de [12]anuleno, ampliando el alcance de la química del deshidroanuleno.
  • Las propiedades electrónicas, incluida la aromaticidad (manifestada como diatropicidad en dianiones), son isómero-dependientes.
  • La interacción de los counteriones con los sistemas de annulene influye significativamente en sus propiedades espectroscópicas.