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Videos de Conceptos Relacionados

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Radical Formation: Addition00:47

Radical Formation: Addition

1.8K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.8K
Radical Formation: Overview01:03

Radical Formation: Overview

2.2K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.2K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.7K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
3.7K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

2.0K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
2.0K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.2K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.2K

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Video Experimental Relacionado

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

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Generación diradical a través de transferencia de electrones acoplados a protones en relé

Qianqian Shi1, Zhipeng Pei2, Jinshuai Song1

  • 1Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.

Journal of the American Chemical Society
|February 8, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo modelo de transferencia de electrones acoplados a protones retransmitidos (PCET retransmitido) explica la generación diradical. Este hallazgo avanza en la comprensión de las reacciones de acoplamiento cruzado radical-radical y abre nuevas posibilidades sintéticas.

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Área de la Ciencia:

  • Química orgánica
  • Química Física
  • Mecanismos de reacción

Sus antecedentes:

  • La generación diradical seguida de acoplamiento cruzado radical-radical es un método sintético clave.
  • El mecanismo preciso de generación diradical sigue siendo incompletamente entendido.

Objetivo del estudio:

  • Proponer y validar un nuevo mecanismo para la generación de radicales.
  • Para aclarar los cambios estructurales electrónicos durante los procesos radicales.

Principales métodos:

  • Se emplearon cálculos de la mecánica cuántica.
  • El estudio utilizó un modelo de reacción de acoplamiento cruzado diradical mediado por carbenos.
  • También se investigó un modelo diseñado específicamente.

Principales resultados:

  • Se propuso y confirmó un nuevo modelo, la transferencia de protones acoplados por relé (PCET por relé).
  • Se observaron los cambios estructurales electrónicos detallados durante los procesos radicales.
  • Los hallazgos proporcionan una nueva visión mecanicista de la generación de radicales.

Conclusiones:

  • El modelo de PCET retransmitido confirmado ofrece una nueva perspectiva sobre la generación de radicales.
  • Esta comprensión mecanicista podría facilitar el desarrollo de nuevas reacciones de acoplamiento cruzado radical-radical.