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Los compuestos del grupo principal oxidan selectivamente mezclas de metano, etano y propano a ésteres de alcohol

Brian G Hashiguchi¹, Michael M Konnick, Steven M Bischof

¹The Scripps Energy and Materials Center, Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458, USA.

Science (New York, N.Y.)

|March 15, 2014

Resumen

Los cationes electrofílicos del grupo principal, el talio (III) y el plomo (IV), oxidan eficientemente los alcanos como el metano y el propano a ésteres de alcohol. Este nuevo enfoque ofrece una alta selectividad y concentración en condiciones suaves.

Área de la Ciencia:

Química Inorgánica La Química Inorgánica es la química inorgánica.
La catálisis es la catálisis.
Síntesis orgánica La síntesis orgánica.

Sus antecedentes:

La investigación de la oxidación de alcano homogéneo utiliza principalmente catalizadores de metales de transición.
El desarrollo de métodos eficientes y selectivos para la funcionalización de alcano sigue siendo un desafío importante en la química.

Objetivo del estudio:

Investigar el potencial de los cationes electrófilos del grupo principal para la oxidación de alcano.
Explorar el mecanismo y la eficiencia del talio (III) y el plomo (IV) en la conversión de alcanos en ésteres de alcohol.

Principales métodos:

Oxidación estequiométrica del metano, el etano y el propano utilizando los cationes tallio (III) y plomo (IV).
Reacciones llevadas a cabo en un disolvente de ácido trifluoroacético a 180°C.
Conocimientos mecanicistas obtenidos a través de datos experimentales y cálculos teóricos.

Principales resultados:

Alta selectividad (>95%) para los ésteres de alcohol, incluidos el metanol, el etanol y los derivados del isopropanol.
Se alcanzan concentraciones de producto de hasta 1,48 M en 3 horas.
Identificó la activación de enlaces electrofílicos C-H como el paso mecánico clave.

Conclusiones:

Los cationes de talio (III) y plomo (IV) son oxidantes estequiométricos efectivos para los alcanos.
La reactividad se atribuye a la coordinación de alcanos fáciles en sitios vacíos en los cationes del grupo principal d(10).
Esto ofrece una alternativa prometedora a los catalizadores de metales de transición para la oxidación de alcano.

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