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Videos de Conceptos Relacionados

Lewis Acids and Bases02:16

Lewis Acids and Bases

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This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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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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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.1K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
3.1K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

3.6K
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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Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

2.7K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
2.7K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

3.1K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Video Experimental Relacionado

Updated: Sep 10, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Activación de enlaces N-H de amoníaco utilizando pares intramoleculares de Lewis de cAAC y borano

Hayoung Song1, Nathaniel K Szymczak1

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States.

Inorganic chemistry
|August 25, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Exploramos cómo un adducto de Lewis cíclico (alquilo) (amino) reacciona con el agua y el amoníaco. El amoníaco desencadena la activación del enlace N-H y la desprotonación, produciendo una única amida de litio estabilizada con borano.

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Área de la Ciencia:

  • Química organometálica
  • Química del boro
  • Química de los carbenos

Sus antecedentes:

  • Los aductos intramoleculares cíclicos (alquilo) y (amino) de Lewis son compuestos nuevos.
  • Comprender su reactividad con moléculas pequeñas es crucial para las aplicaciones sintéticas.

Objetivo del estudio:

  • Investigar la reacción de un adducto específico de carbeno-borano (1) con agua y amoníaco.
  • Caracterizar los productos y aclarar los mecanismos de reacción.

Principales métodos:

  • Reacción del adducto (1) con agua y amoníaco en condiciones controladas.
  • Análisis espectroscópico (NMR, IR) y cristalografía de rayos X para la caracterización del producto.

Principales resultados:

  • Expansión del anillo BBN inducida por agua en el adducto (1).
  • El amoníaco promovió la activación del enlace N-H y la posterior desprotonación del adducto.
  • Aislamiento de una amida de litio estabilizada con borano, un complejo lineal de litio.

Conclusiones:

  • El adducto carbeno-borano exhibe una reactividad distinta hacia el agua y el amoníaco.
  • La desprotonación mediada por amoníaco ofrece una nueva ruta para las amidas de litio estabilizadas por boro.
  • El complejo de litio lineal representa un motivo estructural poco común.