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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

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Reacción fotoquímica Hexadehidro-Diels-Alder

Feng Xu¹, Xiao Xiao¹, Thomas R Hoye¹

¹Department of Chemistry, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States.

Journal of the American Chemical Society

|May 27, 2017

Resumen

La iniciación fotoquímica de la reacción hexadehidro-Diels-Alder (HDDA) ofrece un nuevo método para generar derivados de benceno. Este proceso de foto-HDDA funciona a bajas temperaturas sin reactivos tradicionales, produciendo bencinas idénticas a las de los métodos térmicos.

Área de la Ciencia:

Química orgánica
La fotoquímica

Sus antecedentes:

La reacción hexadehidro-Diels-Alder (HDDA) es un método conocido para sintetizar derivados de benceno.
La generación tradicional de benceno a menudo requiere reactivos específicos o produce subproductos.

Objetivo del estudio:

Para explorar el inicio fotoquímico de la reacción HDDA.
Determinar si la foto-HDDA puede generar bencinas en condiciones más suaves y compararlas con las bencinas generadas térmicamente.

Principales métodos:

Iniciación de la reacción HDDA mediante luz (método fotoquímico).
Comparación de las temperaturas de reacción y de las reacciones de captura intermedias entre el HDDA térmico y el HDDA fotográfico.

Principales resultados:

La cicloisomerización hexadehidro-Diels-Alder (HDDA) puede iniciarse fotoquímicamente (foto-HDDA).
La foto-HDDA genera productos intermedios reactivos de benzina de manera eficiente a bajas temperaturas (por ejemplo, -70 °C) sin reactivos adicionales.
Los benzinos generados a través de foto-HDDA exhiben comportamientos de captura idénticos a los de HDDA térmico, lo que indica el mismo estado electrónico.

Conclusiones:

La iniciación fotoquímica proporciona una nueva vía de baja temperatura para las reacciones HDDA.
La foto-HDDA es un método libre de reactivos para generar bencinas, simplificando los procedimientos sintéticos.
El estudio confirma la formación de los mismos intermediarios de benceno tanto en las reacciones térmicas como en las fotoquímicas del HDDA.

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