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Rodio catiónico ((I) -dppf complejo catalizado por la isomerización de olefinas/propargil Claisen

Ken Tanaka¹, Eri Okazaki, Yu Shibata

¹Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. tanaka-k@cc.tuat.ac.jp

Journal of the American Chemical Society

|July 18, 2009

Resumen

Un catalizador de rodio (I) -dppf convierte eficientemente los éteres de allil propargilo en aldehídos alénicos a temperaturas moderadas. El calentamiento adicional promueve la migración de carbonilo, produciendo dienales en buenas cantidades.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis de la catálisis.
Química organometálica Química orgánica de los metales.

Sus antecedentes:

Los éteres de allil propargilo son compuestos orgánicos versátiles.
La isomerización y la migración de carbonilo son transformaciones orgánicas clave.
Los complejos de rodio son catalizadores efectivos en la síntesis orgánica.

Objetivo del estudio:

Para investigar la actividad catalítica de un complejo catiónico de rodio ((I) -dppf.
Para explorar la síntesis de aldehídos alénicos y dienales de éteres de allil propargilo.

Principales métodos:

Isomerización catalítica utilizando un complejo catiónico de rodio ((I) -dppf.
Optimización de la reacción mediante la variación de la temperatura.
Caracterización del producto utilizando técnicas analíticas estándar.

Principales resultados:

El complejo rodio ((I) -dppf cataliza eficientemente la isomerización de los éteres de allil propargilo a aldehídos alénicos.
Se lograron buenos rendimientos a temperaturas que van desde la temperatura ambiente hasta los 40 grados C.
A 80 grados C, se produjo una mayor migración de carbonilo, dando dienales en buenos rendimientos.

Conclusiones:

Los complejos catiónicos de rodio ((I) -dppf son catalizadores eficaces para la síntesis de aldehídos alénicos y dienales.
El control de la temperatura permite la formación selectiva de aldehídos alénicos o dienales.
Esta metodología ofrece una ruta valiosa para la construcción de compuestos carbonílicos complejos insaturados.

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