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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

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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...
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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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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...
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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: Homolysis00:54

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Radical Reactivity: Intramolecular vs Intermolecular01:33

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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 Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

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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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Generación de radicales inducida por coordinación: Abstracción selectiva de átomos de hidrógeno a través de la

Jean-Marc Mörsdorf1, Joachim Ballmann1

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Los investigadores desarrollaron un nuevo método para generar radicales alquilo utilizando un complejo de titanio. Este enfoque utiliza la coordinación del disolvente para iniciar la formación de radicales, lo que permite reacciones selectivas y aplicaciones en la síntesis orgánica.

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Área de la Ciencia:

  • Química organometálica
  • La Química Radical
  • Química orgánica sintética

Sus antecedentes:

  • Los métodos establecidos para la iniciación de radicales mediados por metales se basan en la homólisis térmica o fotoquímica de enlaces M-C.
  • Los radicales alquilo transitorios son altamente reactivos y difíciles de controlar en las transformaciones sintéticas.

Objetivo del estudio:

  • Desarrollar un nuevo método para generar radicales alquilo transitorios.
  • Para controlar la reactividad radical a través del efecto radical persistente.
  • Demostrar la utilidad de esta metodología en transformaciones sintéticas selectivas.

Principales métodos:

  • Desarrollo de un complejo de media jaula de organotitanio hecho a medida.
  • Generación de radicales desencadenada por la coordinación del disolvente (thf) hacia un centro de titanio.
  • Análisis experimentales, computacionales y cinéticos de las reacciones de acoplamiento radical y abstracción de átomos de hidrógeno (HAT).

Principales resultados:

  • Generación exitosa de radicales alquilo no estabilizados junto con los metalorradicales de titanio persistentes.
  • Demostración de las reacciones selectivas de HAT con sustratos como el 9,10-dihidroantraceno.
  • Confirmación de las vías radicales mediante estudios de etiquetado con deuterio y acoplamiento cruzado radical-radical.
  • Establecimiento de una ciclización de radicales 5-endo-trig para sintetizar un sesquiterpeno dihidroxilado.

Conclusiones:

  • El complejo de organotitanio desarrollado permite la generación controlada de radicales alquilo a través de un mecanismo único activado por solvente.
  • El efecto radical persistente domestica efectivamente los radicales transitorios, facilitando las transformaciones selectivas.
  • Esta metodología ofrece una nueva herramienta valiosa para la síntesis orgánica, ejemplificada por la síntesis eficiente de un producto natural complejo.