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Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

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 acid...
Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
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Published on: February 7, 2017

Un método único y altamente eficiente para la aziridinación catalítica de olefinas.

Kiran Guthikonda1, J Du Bois

  • 1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

Journal of the American Chemical Society
|November 15, 2002
PubMed
Resumen

Este estudio presenta un nuevo y eficiente método para la aziridinación de olefinas utilizando ésteres de sulfamato y un catalizador de rodio. El proceso produce valiosos intermedios de aziridina para la síntesis de derivados de 1,2-aminas y aminas primarias.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química sintética de la química sintética.

Sus antecedentes:

  • La aziridinación es una transformación clave en la síntesis orgánica.
  • El desarrollo de métodos eficientes y estereospecíficos para la aziridinación sigue siendo un área activa de investigación.

Objetivo del estudio:

  • Desarrollar un método fácil, de alto rendimiento y estereospecífico para la aziridinación de olefinas.
  • Para utilizar ésteres de sulfamato para las reacciones de transferencia de N-átomos.

Principales métodos:

  • Empleando ésteres de sulfamato como fuentes de nitrógeno.
  • Utilizando 1-2 mol % Rh2 como catalizador.
  • Usando PhI(OAc) 2 como el oxidante terminal para la transferencia del átomo N.
  • Reaccionando una amplia gama de alquenos con H2NSO3CH2CCl3.3.

Principales resultados:

  • Se logra una aziridinación fácil, de alto rendimiento y estereospecífica de las olefinas.
  • Las aziridinas alkoxisulfonilo sintetizadas como intermediarios versátiles.
  • Se ha demostrado la apertura suave de anillos nucleófilos de las aziridinas a los derivados de 1,2-aminas.
  • Se eliminó con éxito el grupo N-tricloroetoxisulfonilo para obtener aminas primarias a través de condiciones de reducción leve.

Conclusiones:

  • El método descrito ofrece un enfoque eficiente y conveniente para la aziridinación.
  • Los intermediarios de aziridina resultantes son valiosos para la síntesis de estructuras de aminas complejas.
  • Esta química proporciona una nueva herramienta útil para la síntesis orgánica.