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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...
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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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.
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Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
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Se trata de un anión radical fosfaliceno cristalino de origen aniónico.

Xiaobo Pan1, Xingyong Wang, Yue Zhao

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, and ‡Centre of Modern Analysis, Nanjing University , Nanjing 210093, China.

Journal of the American Chemical Society
|July 1, 2014
PubMed
Resumen

Los investigadores han sintetizado y caracterizado nuevos aniones radicales de fosfaalqueno, revelando la densidad de espín principalmente en los átomos de fósforo. Este avance marca el primer aislamiento de aniones radicales cristalinos de fosfalqueno.

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Área de la Ciencia:

  • Química del organofosforo y su composición química.
  • Química de los aniones radicales.
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • Los fosfalicenos son compuestos insaturados que contienen un enlace doble fósforo-carbono.
  • Los aniones radicales son especies con un electrón no apareado y una carga negativa, que a menudo exhiben una reactividad única.
  • El aislamiento y la caracterización de aniones radicales estables son cruciales para comprender los procesos de transferencia de electrones y desarrollar nuevos materiales.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos aniones radicales de fosfaalqueno.
  • Para investigar la estructura electrónica y la distribución del espín dentro de estos aniones radicales.
  • Para establecer la primera forma cristalina de un anión radical de fosfaalqueno.

Principales métodos:

  • Aislamiento de sales que contienen aniones radicales de fosfalqueno.
  • Espectroscopia de resonancia paramagnética de electrones (EPR) para la caracterización radical.
  • Espectroscopia de absorción UV-vis para transiciones electrónicas.
  • Difracción de rayos X monocristalino para la determinación estructural.
  • Cálculos teóricos para el análisis de la densidad de giro.

Principales resultados:

  • El éxito en el aislamiento y la caracterización de los aniones radicales de fosfaalqueno.
  • El análisis estructural reveló enlaces P-C alargados y aromatización de fuleno en comparación con los precursores neutros.
  • La espectroscopia EPR y los cálculos teóricos confirmaron que la densidad de espín está predominantemente localizada en los átomos de fósforo.
  • El estudio reporta el primer anión radical cristalino de fosfaalqueno.

Conclusiones:

  • Los aniones radicales del fosfalqueno pueden aislarse como sales cristalinas estables.
  • La estructura electrónica implica una deslocalización significativa con una densidad de espín centrada en el fósforo.
  • Este trabajo abre nuevas vías para explorar la química y las aplicaciones de los aniones radicales basados en fósforo.