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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 Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K
Radical Formation: Overview01:03

Radical Formation: Overview

2.1K
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...
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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...
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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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Borilación terminal C ((sp3) -H mediante muestreo de radicales intermoleculares

Miao Wang1, Yahao Huang1, Peng Hu1

  • 1Institute of Green Chemistry and Molecular Engineering, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.

Science (New York, N.Y.)
|February 1, 2024
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Resumen

Este estudio introduce un nuevo método fotocatalítico para la funcionalización selectiva de los enlaces terminales C ((sp3) -H en los alcanos. El proceso de borilación catalizado por hierro supera los desafíos en las transformaciones de alcano selectivas del sitio.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • La fotoquímica

Sus antecedentes:

  • La transferencia de átomos de hidrógeno (HAT) es crucial para activar enlaces fuertes C ((sp3) -H en alcanos.
  • La funcionalización selectiva del sitio de los alcanos no ramificados sigue siendo un desafío debido a las fuerzas de enlace C ((sp3) -H similares.

Objetivo del estudio:

  • Desarrollar un método fotocatalítico para la borilación selectiva de los enlaces terminales C ((sp3) -H.
  • Para abordar el desafío de la selectividad del sitio en la funcionalización de alcano.

Principales métodos:

  • Muestreo de radicales intermoleculares catalizados por el hierro.
  • La fotocatálisis.
  • Investigaciones mecánicas.

Principales resultados:

  • Se ha logrado la borilación selectiva de enlaces terminales C ((sp3) -H en alcanos no ramificados.
  • Se ha demostrado un proceso HAT reversible seguido de una borilación selectiva por radicales de carbono.
  • Se identificó un papel potencial para un complejo de boro-sulfóxido en el logro de una alta regioselectividad.

Conclusiones:

  • El método fotocatalítico desarrollado ofrece una nueva vía para la funcionalización selectiva de alcano.
  • Los hallazgos avanzan en el campo de la activación y la funcionalidad del enlace C-H.