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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Hidrogenación doble estereoselectiva por iridio-N,P catalizada de enonas conjugadas a alcoholes saturados

Bram B C Peters1, Jia Zheng1, Suppachai Krajangsri1

  • 1Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691Stockholm, Sweden.

Journal of the American Chemical Society
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Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo sistema catalítico para la hidrogenación asimétrica de las enonas utilizando complejos de iridio. El aditivo benzamida permite una reducción eficiente de los enlaces carbonilo y olefínico, creando dos estereocentros con alta selectividad.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Síntesis asimétrica

Sus antecedentes:

  • La hidrogenación asimétrica es crucial para la síntesis de moléculas quirales.
  • Tradicionalmente, se necesitan catalizadores diferentes para la hidrogenación de las cetonas y las olefinas.
  • El desarrollo de catalizadores de doble función sigue siendo un desafío.

Objetivo del estudio:

  • Para investigar el efecto de los aditivos sobre la hidrogenación del enón iridio-N,P catalizado.
  • Desarrollar un sistema catalítico capaz de reducir los enlaces C=O y C=C en las enonas.
  • Comprender el papel de los aditivos para mejorar la estabilidad y la reactividad del catalizador.

Principales métodos:

  • Se utilizan complejos de iridio tipo Crabtree con ligandos N,P.
  • Investigó el impacto de la benzamida como aditivo.
  • Se ha realizado la hidrogenación asimétrica de varios sustratos de enona.
  • La estereoselectividad del producto analizado utilizando el exceso enantiomérico (ee) y la relación diastereomérica (d.r.) No obstante, el

Principales resultados:

  • Se logró un nuevo modo de reactividad para los catalizadores de tipo Crabtree.
  • El aditivo benzamida estabilizó los principales intermediarios de iridio, evitando la desactivación.
  • El sistema hidrogenó eficientemente los enlaces C=O y C=C en enones.
  • Alto rendimiento y excelente estereoselectividad (hasta 99% ee, 99/1 d.r.) se obtuvieron para dos estereocentros contiguos.

Conclusiones:

  • El sistema catalítico Ir-N,P desarrollado con benzamida es muy eficaz para la reducción asimétrica de enonas.
  • Este método proporciona un fácil acceso a valiosos compuestos quirales con múltiples estereocentros.
  • Los hallazgos ofrecen nuevos conocimientos sobre la estabilización del catalizador y la reactividad en las reacciones de hidrogenación.