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Videos de Conceptos Relacionados

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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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 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...
3.9K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

14.5K
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 Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

6.0K
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...
6.0K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Amidación catalítica de metano a través de un plausible intermedio de cobre-nitreno

Jonathan Martínez-Laguna1, Anna Cholewinska2, Elena Borrego1

  • 1Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain.

Journal of the American Chemical Society
|February 19, 2026
PubMed
Resumen

Los investigadores desarrollaron un nuevo método catalizado por cobre para la amidación de metano, convirtiendo directamente el metano en compuestos valiosos sin perder hidrógeno. Este avance amplía las transformaciones catalíticas para el hidrocarburo más simple y otros alcanos.

Palabras clave:
Amidación de metanoCatálisis de cobreTransferencia de nitrenoFuncionalización C-HHidrocarburos ligeros

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Área de la Ciencia:

  • Catálisis
  • Química Orgánica
  • Funcionalización C-H

Sus antecedentes:

  • La conversión directa de metano (CH4) en productos funcionalizados es un desafío.
  • Los métodos existentes a menudo implican procesos deshidrogenativos, perdiendo átomos de hidrógeno.
  • La amidación de metano a través de la transferencia de nitreno es una transformación no reportada.

Objetivo del estudio:

  • Desarrollar una amidación directa y no deshidrogenativa de metano.
  • Ampliar la funcionalización catalítica C-H de hidrocarburos ligeros.
  • Investigar la transferencia de nitreno catalizada por metales para la funcionalización de metano.

Principales métodos:

  • Catálisis a base de cobre para la amidación de metano.
  • Inserción formal de nitreno mediada por metales en enlaces C-H.
  • Estudios mecanísticos que incluyen cálculos DFT y modelado microcinético.

Principales resultados:

  • Amidación directa exitosa de metano usando catalizadores de cobre.
  • Demostración de una vía de amidación C-H no deshidrogenativa.
  • Extensión de la reacción a otros alcanos gaseosos.
  • Propuesta de un mecanismo de intermedio de metalonitreno.

Conclusiones:

  • Los catalizadores de cobre permiten la amidación directa y no deshidrogenativa de metano.
  • La reacción procede a través de un intermedio de metalonitreno.
  • Este trabajo proporciona una nueva ruta para la funcionalización de alcanos ligeros.