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Evidencia de una vía no radical en la fotoracemización de los sulfoxuros de arilo
1Department of Chemistry, Iowa State University, Ames, IA 50011-3111, USA.
Journal of the American Chemical Society
|March 14, 2002
Resumen
La fotólisis de un sulfóxido deuterado causó predominantemente la inversión de azufre, sin afectar el estereocentro adyacente. Esto sugiere un mecanismo de epimerización fotoquímica que evita la división alfa.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- La fotoquímica es la fotoquímica.
- La estereoquímica es la estereoquímica.
Sus antecedentes:
- Los sulfóxidos son compuestos versátiles con aplicaciones en síntesis.
- La comprensión de los resultados estereoquímicos de las reacciones de sulfóxido es crucial para la síntesis asimétrica.
- Las reacciones fotoquímicas ofrecen vías únicas para las transformaciones moleculares.
Objetivo del estudio:
- Para investigar el mecanismo de la epimerización fotoquímica en los sulfóxidos.
- Para determinar el resultado estereoquímico de la fotólisis del sulfóxido.
- Para explorar las vías de reacción que no implican la división alfa homolítica.
Principales métodos:
- Fotólisis de (R(S),S(C))-1-deuterio-2,2-dimetilpropil y p-tolyl sulfóxido. también conocido como (R(S),S(C))-1-deuterio-2,2-dimetilpropil y p-tolyl.
- Análisis de estereoisómeros formados mediante métodos estereoquímicos.
- Interpretación mecanicista basada en los resultados estereoquímicos observados.
Principales resultados:
- La fotólisis produjo predominantemente (S(S),S(C))-1-deuterio-2,2-dimetilpropil p-tolyl sulfóxido.
- La inversión de azufre se produjo sin inversión del centro estereogénico adyacente de CHD.
- La formación de otros estereoisómeros se observó en menor medida.
Conclusiones:
- El resultado estereoquímico predominante indica un mecanismo que involucra sólo la inversión de azufre.
- Los resultados proporcionan evidencia en contra de un mecanismo que involucra la división alfa homolítica.
- La epimerización fotoquímica de los sulfóxidos puede proceder a través de una vía que preserva los estereocentros adyacentes.
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