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Videos de Conceptos Relacionados

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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Reduction of Alkenes: Catalytic Hydrogenation02:13

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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.
The hydrogenation process takes place on the...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Un catalizador selectivo para la hidrogenación del hierro

Niko Sila1, Andreas Dürrmann2, Birgit Weber2

  • 1Inorganic Chemistry II-Catalyst Design, Sustainable Chemistry Center, University of Bayreuth, 95440 Bayreuth, Germany.

Journal of the American Chemical Society
|September 23, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo catalizador de hierro para las reacciones de hidrogenación. Activa el hidrógeno y hidrogena eficientemente los enlaces dobles polares, mostrando una amplia tolerancia al grupo funcional.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis
  • Química sustentable

Sus antecedentes:

  • El hierro es un metal de transición abundante y rentable con un potencial significativo en la catálisis.
  • Comprender el papel del hierro en las transformaciones químicas es crucial para el desarrollo de tecnologías sostenibles.
  • Los catalizadores de hidrogenación existentes a menudo se enfrentan a limitaciones con respecto a la compatibilidad del grupo funcional.

Objetivo del estudio:

  • Informar de un nuevo complejo de hierro (I) como catalizador de hidrogenación eficaz.
  • Para aclarar el mecanismo catalítico, centrándose en la activación del hidrógeno y la hidrogenación del sustrato.
  • Demostrar la tolerancia del catalizador hacia varios grupos funcionales.

Principales métodos:

  • Síntesis y caracterización del complejo del hierro.
  • Estudios cinéticos para determinar las velocidades y órdenes de reacción.
  • Investigaciones mecánicas, incluido el etiquetado isotópico y los estudios computacionales.
  • Prueba del rendimiento del catalizador con varios sustratos que contengan grupos sensibles a la hidrogenación.

Principales resultados:

  • El catalizador de hierro activa el hidrógeno a través de la escisión de enlaces heterolíticos, formando un monohidrido intermedio.
  • La hidrogenación de los enlaces dobles polares se lleva a cabo a través de una vía bimetálica que implica la transferencia de hidruro asistida por potasio.
  • El mecanismo catalítico evita las vías de adición oxidativa y eliminación reductiva.
  • El catalizador demuestra una excelente tolerancia a los grupos funcionales sensibles a la hidrogenación, incluidos los carbonilos (CO).

Conclusiones:

  • Se ha desarrollado un nuevo catalizador de hidrogenación de hierro.
  • El mecanismo aclarado ofrece una nueva perspectiva sobre la hidrogenación catalizada por hierro.
  • Este catalizador representa un avance prometedor para la hidrogenación selectiva en moléculas complejas.