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In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Inserción de areno con hidritos de molibdeno apoyados en pinzas: determinación de la selectividad del sitio, tasas

Gabriele Hierlmeier1, Paolo Tosatti2, Kurt Puentener2

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society
|September 13, 2023
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Resumen

Los investigadores desarrollaron nuevos complejos de molibdeno para la hidrogenación selectiva del areno. Estos complejos permiten la inserción controlada en arenas, dando lugar a valiosos hidratos de ciclohexadienilo y productos potencialmente enriquecidos con enantio.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis
  • Síntesis orgánica

Sus antecedentes:

  • Los complejos de molibdeno son catalizadores versátiles en las transformaciones orgánicas.
  • La hidrogenación del areno es una reacción clave en la química sintética.
  • El control de la selectividad del emplazamiento en la funcionalización continua siendo un reto.

Objetivo del estudio:

  • Para sintetizar nuevos complejos de molibdeno apoyados en fosfino (oxazolina) piridina (0).
  • Investigar la reactividad de estos complejos en la hidrogenación del areno.
  • Explorar los factores que influyen en la selectividad del sitio y las tasas de reacción.

Principales métodos:

  • Síntesis de complejos de molibdeno ((0) cicloocta-1,5-dieno.
  • Reacción con dihidrógeno y varios arenes sustituidos.
  • Análisis de los productos de inserción y determinación de las tasas relativas mediante experimentos de competencia.

Principales resultados:

  • Los hidratos de ciclohexadienilo de molibdeno se formaron a través de la inserción de areno.
  • La selectividad del sitio aumentó con el tamaño del sustituyente para las arenas mono y disubstituidas.
  • Las arenas ricas en electrones mostraron tasas de inserción más rápidas.
  • Los grupos de retirada de electrones alteraron la selectividad y favorecieron la eliminación reductiva de H2.
  • Se sintetizó ciclohexa-1,3-dieno enriquecido con enantio.

Conclusiones:

  • El diseño del ligando influye en la hidrogenación catalítica del areno.
  • Se desarrolló una nueva estrategia para la reducción selectiva de arsenales.
  • Se obtuvieron conocimientos sobre la funcionalización del areno catalizado por molibdeno.