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Videos de Conceptos Relacionados

Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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 molecule. These three...
Radical Formation: Overview01:03

Radical Formation: Overview

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 latter, also known...
Radical Formation: Addition00:47

Radical Formation: Addition

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 unpaired...
Radical Formation: Elimination00:51

Radical Formation: Elimination

Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect to...
Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Conversión y migración de radicales en la disociación de captura de electrones.

Benjamin N Moore1, Tony Ly, Ryan R Julian

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|April 19, 2011
PubMed
Resumen

La disociación por captura de electrones (ECD, por sus siglas en inglés) es una técnica proteómica. Los nuevos hallazgos sugieren que la química radical deficiente en hidrógeno contribuye significativamente a la fragmentación de la ECD, ofreciendo nuevos conocimientos mecánicos.

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Área de la Ciencia:

  • Proteómica y Química Analítica.

Sus antecedentes:

  • La disociación por captura de electrones (ECD) es vital para la proteómica, ya que ayuda en el análisis de secuencias y modificaciones.
  • Los mecanismos químicos precisos que impulsan la fragmentación de la ECD siguen siendo objeto de debate.
  • La investigación existente a menudo pasa por alto las vías de disociación no vertebrales.

Objetivo del estudio:

  • Investigar el papel de la pérdida de la cadena lateral y otros canales de disociación en los mecanismos de ECD.
  • Explorar las vías químicas después de la formación radical inicial en ECD.
  • Para determinar si la química de los radicales con deficiencia de hidrógeno influye en los patrones de fragmentación del ECD.

Principales métodos:

  • Centrándose en la pérdida de la cadena lateral y las vías alternativas de disociación en la ECD.
  • Analizando los iones de fragmentos generados a través de ECD.
  • Comparando las observaciones de ECD con la química radical conocida deficiente en hidrógeno.

Principales resultados:

  • Los radicales ricos en hidrógeno formados inicialmente en ECD se convierten rápidamente en radicales deficientes en hidrógeno.
  • La disociación posterior es predominantemente mediada por esta química radical deficiente en hidrógeno.
  • El análisis estadístico de los fragmentos de ECD se alinea con las predicciones de la química radical con deficiencia de hidrógeno.
  • La química de los radicales deficientes de hidrógeno explica la disociación selectiva en los enlaces disulfuro.

Conclusiones:

  • La química de los radicales con deficiencia de hidrógeno juega un papel crucial, a menudo pasado por alto, en la fragmentación del ECD.
  • Los mecanismos de ECD se pueden entender mejor considerando las vías radicales deficientes de hidrógeno.
  • Los hallazgos son reproducibles utilizando métodos independientes no ECD para la generación de radicales deficientes de hidrógeno.