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Hidratación de los complejos de nitrosilrutenio bis ((alquinilo) con hidrotris ((pirazolyl) borato:
Yasuhiro Arikawa1, Yoshimasa Nishimura, Kenta Ikeda
1Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan.
Journal of the American Chemical Society
|March 25, 2004
Resumen
La hidratación catalizada por rutenio de un complejo de nitrosilrutenio bis ((alquinyl) produce metaciclos y complejos cetoniles. La elección del disolvente y la temperatura influyen en la distribución del producto, con un intermediario clave identificado en la vía de reacción.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Los complejos de rutenio.
- La catálisis es la catálisis.
Sus antecedentes:
- Los complejos de nitrosilrutenio con ligandos de alquinilo son valiosos precursores sintéticos.
- Comprender la reactividad de estos complejos es crucial para desarrollar nuevas transformaciones catalíticas.
Objetivo del estudio:
- Para investigar las reacciones de hidratación de un complejo específico de nitrosilrutenio bis (alquinilo), TpRu (CCPh) 2 (NO).
- Para dilucidar los mecanismos de reacción e identificar los intermediarios clave.
- Para explorar la influencia del disolvente y la temperatura en la selectividad del producto.
Principales métodos:
- Se realizaron reacciones de hidratación del complejo de nitrosilrutenio bis ((alquinilo) utilizando HBF4.Et2O en diferentes disolventes (MeOH, THF).
- La caracterización del producto se logró a través de métodos espectroscópicos y la determinación del rendimiento.
- Las condiciones de reacción fueron variadas (temperatura, disolvente) para estudiar la selectividad.
Principales resultados:
- La hidratación en MeOH produjo un ciclo metálico (2) y un complejo (3) bis (((cetonilo)).
- La hidratación en THF produjo el complejo 2, un complejo acil-cetonilo (4) y trazas de otros productos.
- Se observó la formación exclusiva de un complejo intermedio (5) a 0 °C en MeOH, que tras un tratamiento posterior dio lugar a complejos 3 y 4.
Conclusiones:
- La hidratación de TpRu ((CCPh) 2 ((NO) es sensible al disolvente y a la temperatura.
- Se sintetizó un nuevo ciclo metálico y varios complejos cetonílicos.
- El complejo 5 fue identificado como un intermediario clave en la formación de los productos 3 y 4, destacando una vía combinada de inserción e hidratación.
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