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Videos de Conceptos Relacionados

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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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...
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Radical Formation: Addition00:47

Radical Formation: Addition

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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...
2.3K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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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...
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Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
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Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

Radical Anti-Markovnikov Addition to Alkenes: Overview

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The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
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Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

1.9K
In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Estabilidad orgánica Neutral Dirradical a través de la coordinación reversible

Zhenpin Lu1, Henrik Quanz1, Olaf Burghaus2

  • 1Institut für Organische Chemie, Justus-Liebig-Universität , Heinrich-Buff-Ring 17, 35392 Giessen, Germany.

Journal of the American Chemical Society
|December 12, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores crearon un diradical de diboro neutro estable mediante la coordinación de un compuesto de dinitrógeno con ortofenildiborano. Este proceso reversible produce una especie radical estable por encima de 200 °C, abriendo nuevas aplicaciones.

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Área de la Ciencia:

  • Química
  • Ciencias de los materiales
  • Química Cuántica

Sus antecedentes:

  • Los radicales estables son cruciales para varias aplicaciones.
  • La generación y el control de las especies radicales sigue siendo un desafío importante en la química.

Objetivo del estudio:

  • Para reportar la formación de un diborón neutral y estable.
  • Para explorar las propiedades electrónicas y la estabilidad de esta nueva especie radical.
  • Investigar un nuevo método para generar radicales estables.

Principales métodos:

  • Química de coordinación que incluye un compuesto aromático de nitrógeno y ortofenildiborano.
  • Reacción reversible demostrada por la adición de piridina.
  • Estudios computacionales para analizar la estructura electrónica y la estabilidad de los radicales.

Principales resultados:

  • Formación exitosa de un diradical de diboro neutro estable.
  • El diradical es estable a temperaturas superiores a 200 °C.
  • Se confirma la reversibilidad del proceso de formación.
  • El análisis computacional indica un diradical triplete de caparazón abierto con una pequeña brecha de energía singlet-triplete, lo que sugiere desarticulación electrónica.

Conclusiones:

  • Se ha sintetizado un nuevo y estable diboron diradical neutro.
  • Este descubrimiento proporciona una nueva vía para generar radicales estables.
  • Las propiedades electrónicas únicas de este radical ofrecen un potencial para diversas aplicaciones.