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Radical Formation: Addition00:47

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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: Overview01:11

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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: Elimination00:51

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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...
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Radical Substitution: Allylic Bromination01:27

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In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
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Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

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In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Funcionalización directa de los azúcares nativos

Yi Jiang1,2,3, Yi Wei1, Qian-Yi Zhou1

  • 1Department of Chemistry, National University of Singapore, Singapore, Singapore.

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Resumen

Los químicos desarrollaron un nuevo método fotoinducido para la glicosilación directa utilizando azúcares nativos. Este enfoque libre de grupos protectores simplifica la síntesis de carbohidratos complejos y permite la glicosilación directa de proteínas.

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Área de la Ciencia:

  • Química de los carbohidratos
  • Síntesis orgánica
  • La bioquímica

Sus antecedentes:

  • Los azúcares naturales poseen numerosos grupos hidroxilo reactivos, lo que complica la modificación química directa.
  • La síntesis tradicional de carbohidratos complejos (glicanos) requiere estrategias laboriosas de grupo protector.
  • La transformación directa y selectiva de azúcares nativos en reactivos valiosos sigue siendo un desafío importante en la química.

Objetivo del estudio:

  • Desarrollar un nuevo método libre de grupos protectores para la glucosilación química estereoselectiva.
  • Para permitir la síntesis directa de sacarídeos complejos a partir de bloques de construcción de azúcares nativos fácilmente disponibles.
  • Explorar la aplicación de este método en la glucosilación de proteínas.

Principales métodos:

  • Se empleó un enfoque fotoinducido que utiliza la química homolítica (de un electrón).
  • El método consiste en la generación regiocontrolada de un donante transitorio de glucósilo a partir de azúcares nativos.
  • El acoplamiento cruzado basado en radicales con electrófilos se activa por la luz, evitando la protección del grupo hidroxilo.

Principales resultados:

  • La estrategia de "cap y glicosilato" proporciona un acceso directo a diversos compuestos de glicosilo.
  • Se logró una funcionalización anómica selectiva de los mono- y oligosacáridos.
  • El método desarrollado demostró biocompatibilidad y se extendió con éxito a la glicosilación directa de proteínas post-traductora.

Conclusiones:

  • Este método fotoinducido, libre de grupos protectores, ofrece una ruta simplificada a los compuestos complejos de glucosilo de los azúcares nativos.
  • El enfoque imita los procesos naturales en su generación de donantes controlada por región y acoplamiento basado en radicales.
  • La glicosilación directa de proteínas representa un avance significativo en la bioconjugación y la glucobiología.