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Videos de Conceptos Relacionados

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.2K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

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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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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Dos carbonos de cobre de un compuesto diazo

María Álvarez1, Maria Besora2,3, Francisco Molina1

  • 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
|March 18, 2021
PubMed
Resumen

Los investigadores descubrieron un nuevo complejo de carbenos de cobre formado a través de la descarbonización de una diazoacetamida. Esta inesperada modificación del ligando de carbenos desafía las suposiciones anteriores en la síntesis orgánica catalizada por metales de transición.

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Área de la Ciencia:

  • Química organometálica
  • Síntesis orgánica
  • Catálisis

Sus antecedentes:

  • Los complejos de metales de transición se utilizan ampliamente para generar metales carbónicos a partir de compuestos diazo para la síntesis orgánica.
  • Anteriormente, se creía que el fragmento de carbeno en los carbenos metálicos permanecía sin cambios con respecto al compuesto diazo de origen.

Objetivo del estudio:

  • Para investigar la reacción de un complejo de cobre con una diazoacetamida.
  • Caracterizar las especies de carbenos de cobre resultantes y comprender el mecanismo de reacción.

Principales métodos:

  • Reacción de TpMsCu(THF) con N,N-dietilo diazoacetamida.
  • Aislamiento y caracterización de los productos de carbonos de cobre.
  • Análisis de datos experimentales, cálculos de la teoría funcional de la densidad (DFT) y modelado microkinético.

Principales resultados:

  • Aislamiento de un carbeno de cobre monosubstituido estable, TpMsCuC ((H) ((NEt2), resultado de la descarbonización.
  • Detección de monóxido de carbono atrapado como TpMsCu ((CO).
  • Evidencia de la formación del carbeno esperado, TpMsCuC(H) ((CONEt2), y su posterior transformación a través de la pérdida de CO.

Conclusiones:

  • El estudio informa de la primera instancia de un ligando modificado de carbenos en un complejo metal-carbenos, resultante de la descarbonización.
  • Un mecanismo propuesto que implica la pérdida de CO explica la formación del carbeno de cobre modificado observado.
  • Este hallazgo amplía la comprensión de la reactividad metal-carbeno y ofrece nuevas posibilidades sintéticas.