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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
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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.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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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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Interacción "π-Hole-π" promovida por la hidrofluoración fotocatalítica a través de la transferencia de electrones en

Jingzhi Lu1, Navneet S Khetrapal1, Jacob A Johnson1

  • 1Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.

Journal of the American Chemical Society
|December 15, 2016
PubMed
Resumen

Hemos desarrollado un método fotocatalítico sin metales para la hidrodefluoración de polifluoroarenos utilizando fotocatalizadores de pireno. Este proceso aprovecha las interacciones específicas y los factores estéricos para controlar las velocidades de reacción y los mecanismos de transferencia de electrones.

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Área de la Ciencia:

  • Química orgánica
  • Fotocatálisis
  • Ciencias de los materiales

Sus antecedentes:

  • Los polifluoroarenos (PA) son frecuentes en diversas aplicaciones industriales, pero su persistencia en el medio ambiente plantea desafíos.
  • El desarrollo de métodos eficientes y selectivos de desfluorización es crucial para la remediación ambiental y la química sintética.
  • La fotocatálisis sin metales ofrece una alternativa sostenible a los métodos tradicionales.

Objetivo del estudio:

  • Introducir una nueva hidrofluoración fotocatalítica sin metales (HDF) de los polifluoroarenos (FA).
  • Investigar el papel de los fotocatalizadores basados en pireno (Py) en la facilitación de la transferencia de electrones y el HDF.
  • Para aclarar la influencia de los factores estéricos y electrónicos en el mecanismo y la velocidad de reacción del HDF.

Principales métodos:

  • Se han utilizado fotocatalizadores a base de pireno para el HDF sin metales de FA.
  • Se analizaron las interacciones electrónicas (π-agujero-π) entre el fotocatalizador y el sustrato.
  • Investigó el impacto del obstáculo estérico en la cinética de la reacción y las vías de transferencia de electrones.

Principales resultados:

  • Se obtiene un HDF fotocatalítico libre de metales de FA utilizando derivados de pireno.
  • Se demostró que las interacciones débiles π-agujero-π promueven la transferencia de electrones a pesar de las energías desfavorables (ΔGET hasta 0,63 eV).
  • Se estableció que el obstáculo estérico entre los fotocatalizadores de pireno y los sustratos de FA dicta las tasas de HDF, lo que indica un mecanismo de transferencia de electrones en la esfera interna.

Conclusiones:

  • El tamaño y la forma de los fotocatalizadores y sustratos son críticos para controlar los mecanismos y las tasas de transferencia de electrones en la fotocatálisis.
  • Este estudio proporciona información sobre el diseño de sistemas fotocatalíticos eficientes para las reacciones de desfluoración.
  • Destaca el potencial de los fotocatalizadores basados en pireno para las transformaciones orgánicas sostenibles.