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Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
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The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
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La reacción oscilante de Fischer-Tropsch

Rui Zhang1, Yong Wang1,2, Pierre Gaspard3

  • 1Voiland School of Chemical Engineering and Bioengineering at Washington State University, Pullman, WA 99164, USA.

Science (New York, N.Y.)
|October 5, 2023
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Resumen

Los investigadores descubrieron oscilaciones autosuficientes en la producción de hidrocarburos durante la hidrogenación catalítica de monóxido de carbono, un paso clave de la síntesis de Fischer-Tropsch. Este hallazgo avanza en la comprensión de la dinámica de reacción compleja sobre los catalizadores de cobalto.

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Área de la Ciencia:

  • Catálisis
  • La cinética química
  • Ciencias de la superficie

Sus antecedentes:

  • La síntesis de Fischer-Tropsch (FTS) es crucial para convertir el gas de síntesis en hidrocarburos, pero sus fundamentos mecánicos siguen sin estar claros.
  • Comprender la dinámica de reacción de los catalizadores basados en cobalto es esencial para optimizar la producción de hidrocarburos.

Objetivo del estudio:

  • Investigar las etapas mecanicistas que rigen la formación de hidrocarburos durante la hidrogenación de CO sobre catalizadores de cobalto.
  • Para aclarar el origen de las oscilaciones de velocidad y selectividad observadas en FTS.

Principales métodos:

  • Se utilizó un catalizador de óxido de cobalto/cerio (Co2Ce1) a 220°C y a presión atmosférica.
  • Se emplearon condiciones no isotérmicas y un modelo microkinético para estudiar las oscilaciones autosuficientes.
  • Oscilaciones generadas mediante cambios forzados de temperatura y validadas con datos experimentales.

Principales resultados:

  • Se han observado oscilaciones autosuficientes de velocidad y selectividad durante más de 24 horas.
  • Se ha demostrado una buena concordancia entre los datos de oscilación experimentales y teóricos a través de varias presiones de reactivos.
  • Retratos de fase construidos que apoyan un origen termokinético para las oscilaciones observadas.

Conclusiones:

  • El estudio revela un comportamiento oscilatorio autosuficiente en la síntesis de Fischer-Tropsch sobre los catalizadores de cobalto.
  • Estas oscilaciones son impulsadas por efectos termokinéticos, proporcionando nuevos conocimientos mecanicistas.
  • Los resultados contribuyen a una comprensión más profunda de la dinámica de las reacciones catalíticas complejas.