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Mecanismo y estereoquímica de la formación de difosfato a partir de los dioxafosforinanos: una reevaluación crítica
P M Cullis1, J Fawcett, G A Griffith
1Department of Chemistry, University of Leicester, Leicester, LE1 7RH, UK.
Journal of the American Chemical Society
|July 18, 2001
Resumen
Este estudio investiga los mecanismos de formación de difosfato. Los hallazgos revelan que los difosfatos asimétricos se forman a través de un ataque nucleófilo con inversión, mientras que los difosfatos simétricos surgen de la retención o isomerización.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Química del fósforo Química del fósforo
Sus antecedentes:
- La formación de difosfato es crucial en varios procesos químicos.
- Comprender los mecanismos de reacción ayuda a controlar la formación de productos.
Objetivo del estudio:
- Para aclarar el mecanismo de la formación de difosfato a partir de precursores específicos de dioxaphosphorinane.
- Diferenciar las vías que conducen a difosfatos simétricos y no simétricos.
Principales métodos:
- Espectroscopia de Resonancia Magnética Nuclear (RMN) (31P RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) (31P) Espectroscopia de Resonancia Magnética Nuclear (RMN) (31P) Espectroscopia de Resonancia Magnética Nuclear (RMN) (31P) Espectroscopia de Resonancia Magnética Nuclear (31P) Espectroscopia de Resonancia Magnética Nuclear (31P) Espectroscopia de Resonancia Magnética Nuclear (31P) Espectroscopia de Resonancia Magnética Nuclear (31P) Espectroscopia de Resonancia Magnética Nuclear (31P) Espectroscopia de Resonancia Magnética Nuclear (31P)
- Espectrometría de masas y análisis elemental.
- Cristalografía de rayos X. Cristalografía de rayos X.
- Estudios de etiquetado con 18O.
Principales resultados:
- Los difosfatos ax-ax y ax-eq identificados como productos.
- El etiquetado con 18O confirmó el ataque nucleofílico con inversión para los difosfatos asimétricos.
- Los difosfatos simétricos se forman a través de un ataque directo con retención o isomerización de los difosfatos asimétricos.
Conclusiones:
- El mecanismo implica un ataque nucleófilo selectivo a los cloruros de dioxafosforinano.
- La isomerización de difosfatos asimétricos es una vía clave para difosfatos simétricos.
- La estereoquímica en el fósforo está controlada por el ataque nucleófilo y los procesos de isomerización.
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