Video Experimental Relacionado

Updated: Jul 3, 2025

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Controlar la reactividad y la selectividad en la reacción de Mizoroki-Heck: Evaluación de alto rendimiento de

Eric S Isbrandt¹, Devon E Chapple², Nguyen Thien Phuc Tu³

¹Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N 6N5, Canada.

Journal of the American Chemical Society

|February 15, 2024

Resumen

Los nuevos ligandos de difosfina (P2N2) muestran una amplia aplicabilidad en la reacción de Mizoroki-Heck, permitiendo la síntesis selectiva de productos lineales o ramificados mediante la alteración de los sustituyentes. Esto pone de relieve su importante potencial en la síntesis orgánica.

Área de la Ciencia:

Química orgánica
Catálisis
Metodología sintética

Sus antecedentes:

La reacción de Mizoroki-Heck es una piedra angular de la formación de enlaces C-C en la síntesis orgánica.
El desarrollo de sistemas catalíticos eficientes y selectivos sigue siendo un desafío clave.
El diseño de ligandos es crucial para controlar la reactividad y la selectividad en las reacciones de acoplamiento cruzado.

Objetivo del estudio:

Realizar una evaluación de alto rendimiento de la reacción de Mizoroki-Heck utilizando diversos socios de acoplamiento de olefinas.
Para comparar la eficacia de los ligandos de 1,5-diaza-3,7-difosfacicloctano (P2N2) con los ligandos "estándar de oro" establecidos.
Investigar el potencial de los ligandos P2N2 para permitir la arilación regiodivergente de los estirenos.

Principales métodos:

Selección de alto rendimiento de varios socios de acoplamiento de olefinas en la reacción de Mizoroki-Heck.
Variación sistemática de los sustituyentes de fósforo en los ligandos P2N2 (fenilo frente al tert-butilo).
Estudios mecanicistas experimentales y computacionales para aclarar el origen de la regioselectividad.

Principales resultados:

Los ligandos de 1,5-diaza-3,7-difosfacicloctano (P2N2) demuestran una aplicabilidad más amplia que los ligandos comunes.
Dos ligandos P2N2 específicos permiten la arilación regiodivergente de los estirenos.
El cambio del sustituto de fósforo de fenilo a terciobutilo permite el acceso a altas proporciones de productos Mizoroki-Heck lineales o ramificados.
Los estudios mecánicos sugieren que las interacciones ligando-olefinas (π-π o choque estérico) dictan el regiocontrol.

Conclusiones:

Las difosfinas P2N2 de fácil acceso poseen un potencial significativo, no reconocido previamente en la síntesis orgánica.
El andamio P2N2 ofrece una plataforma versátil para el desarrollo de catalizadores con selectividad ajustable.
La comprensión de la base mecanicista del regiocontrol puede guiar el diseño futuro del ligando para la reacción de Mizoroki-Heck.

Más Videos Relacionados

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Videos de Conceptos Relacionados

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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.

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.