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Videos de Conceptos Relacionados

Reaction Stoichiometry02:57

Reaction Stoichiometry

A balanced chemical equation provides a great deal of information in a very succinct format. Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction. Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction. These quantitative relationships are known as the reaction’s...
Preparation of Amides01:29

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...

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Video Experimental Relacionado

Updated: Jul 24, 2026

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
11:01

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

Published on: November 23, 2016

Síntesis de amoníaco a partir de cálculos basados en los primeros principios.

K Honkala1, A Hellman, I N Remediakis

  • 1Center for Atomic-Scale Materials Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark.

Science (New York, N.Y.)
|February 1, 2005
PubMed
Resumen

Los cálculos de la química cuántica predicen con precisión las tasas de síntesis de amoníaco utilizando catalizadores de nanopartículas de rutenio. Este enfoque computacional ayuda en el descubrimiento de nuevos catalizadores.

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Ammonia Synthesis at Low Pressure
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Last Updated: Jul 24, 2026

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
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Published on: April 26, 2024

Área de la Ciencia:

  • Ciencia de la ciencia de la catálisis.
  • La química cuántica es una química cuántica.
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • La síntesis de amoníaco es crucial para la producción mundial de alimentos.
  • El desarrollo de catalizadores eficientes de rutenio es un desafío continuo.
  • Es muy deseable predecir el rendimiento del catalizador de forma computacional.

Objetivo del estudio:

  • Para calcular las tasas de síntesis de amoníaco utilizando métodos químicos cuánticos.
  • Para validar las predicciones teóricas contra los datos experimentales.
  • Evaluar el potencial de los métodos computacionales para el descubrimiento de catalizadores.

Principales métodos:

  • Utilizando la teoría funcional de densidad (DFT) para el tratamiento químico cuántico.
  • Empleando microscopía electrónica de transmisión (TEM) para la distribución del tamaño de las nanopartículas.
  • Comparando las tasas calculadas por DFT con las tasas medidas experimentalmente.

Principales resultados:

  • Las tasas de síntesis de amoníaco calculadas estaban dentro de un factor de 3 a 20 de las tasas experimentales.
  • La distribución del tamaño de las nanopartículas de rutenio sirvió como un eslabón clave.
  • Se logró una correlación exitosa entre los hallazgos teóricos y experimentales.

Conclusiones:

  • Los cálculos químicos cuánticos, específicamente DFT, pueden predecir directamente las tasas catalíticas.
  • Los métodos computacionales son prometedores para acelerar el descubrimiento de nuevos catalizadores.
  • La integración de la caracterización experimental (TEM) con modelos teóricos mejora la precisión predictiva.