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Videos de Conceptos Relacionados

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.1K
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: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.1K
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...
2.1K
Radical Formation: Addition00:47

Radical Formation: Addition

1.7K
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...
1.7K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

1.9K
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...
1.9K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.7K
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...
1.7K
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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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Reacciones click-clip mediadas por radicales

Jiantao Zhao1, Huacheng Yu1, Xingchen Jin1

  • 1Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Science (New York, N.Y.)
|September 19, 2024
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Resumen

Los investigadores desarrollaron una reacción de clic reversible utilizando enlaces de sulfilimina. Este avance permite una escisión precisa bajo demanda, lo que permite nuevas aplicaciones en materiales despolimerizables y biomoléculas modificadas.

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Área de la Ciencia:

  • Química orgánica
  • Química sintética
  • Química de los polímeros

Sus antecedentes:

  • Las reacciones de clic ofrecen un acoplamiento molecular eficiente y selectivo, pero generalmente carecen de reversibilidad.
  • Las reacciones de clic reversibles son altamente deseables para sistemas moleculares dinámicos y transformaciones bajo demanda.
  • El desarrollo de estrategias para la formación de enlaces reversibles y la escisión es crucial para la síntesis avanzada.

Objetivo del estudio:

  • Para establecer un nuevo par de reacción de clic reversible basado en la química de la sulfilimina.
  • Para demostrar la escisión precisa y bajo demanda del enlace de sulfilimina formado.
  • Para explorar la utilidad de esta secuencia de clicks en arquitecturas moleculares complejas.

Principales métodos:

  • Formación de enlaces oxidativos de sulfiliminas entre fenotiazinas y aminas utilizando N-bromosuccinimida.
  • Escisión fotorreductiva del enlace de bromuro de sulfilimina a 380 nanómetros.
  • Aplicación de la reacción reversible en la síntesis de macromoléculas despolimerizables y en la modificación de aminosacáridos.

Principales resultados:

  • Acoplamiento rápido y cuantitativo de fenotiazinas y aminas a través de la formación oxidativa de sulfiliminas.
  • Reversión cuantitativa de alto rendimiento de los bromuros de sulfilimina a las materias primas tras la fotorreducción.
  • Selectividad y eficacia demostradas en sistemas complejos, incluidos los polímeros y los aminosacáridos despolimerizables.

Conclusiones:

  • Se ha desarrollado con éxito un nuevo par de reacciones de clic-clip basado en sulfilimina.
  • El protocolo permite una escisión precisa y bajo demanda, expandiendo significativamente la versatilidad de la química de clic.
  • Esta estrategia reversible es prometedora para aplicaciones avanzadas de ciencia de materiales y biología química.