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Videos de Conceptos Relacionados

Amines to Alkenes: Cope Elimination01:14

Amines to Alkenes: Cope Elimination

2.1K
Cope elimination reaction involves the conversion of tertiary amines to alkene using hydrogen peroxide under thermal conditions, as depicted in figure 1.
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Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

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Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
2.7K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.8K
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...
3.8K
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...
3.1K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.9K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.1K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Acoplamiento de fragmentos unimoleculares catalizados por paladio de N-alilamidas a través de la eliminación de

Ryoma Shimazumi1, Riku Tanimoto1, Takuya Kodama1,2

  • 1Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.

Journal of the American Chemical Society
|June 13, 2022
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Resumen

Este estudio introduce una nueva reacción de acoplamiento de fragmentos unimoleculares catalizada por el paladio. Permite la transformación de amidas mediante la eliminación de isocyanatos para formar nuevos enlaces carbono-carbono y carbono-heteroatomo.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • El acoplamiento de fragmentos unimoleculares (UFC) implica la formación de enlaces a través de la extrusión de moléculas.
  • La catálisis de metales de transición es crucial para muchas reacciones UFC.
  • Las amidas son grupos funcionales versátiles en la síntesis orgánica.

Objetivo del estudio:

  • Desarrollar una nueva reacción de acoplamiento de fragmentos unimoleculares (UFC).
  • Para utilizar la catálisis del paladio para la transformación de amida.
  • Para permitir la funcionalización tardía de las amidas.

Principales métodos:

  • Desarrollo de la reacción catalizada por el paladio.
  • Caracterización de los intermediarios organometálicos mediante el uso de la cristalografía de rayos X.
  • Exploración de las transformaciones de grupos funcionales de amida.

Principales resultados:

  • Se descubrió una nueva reacción UFC que involucra la eliminación de isocyanato catalizado por paladio de las amidas.
  • Se logró la formación de nuevos enlaces carbono-carbono y carbono-heteroatomo.
  • Se caracterizó estructuralmente un intermediario organometálico central para el ciclo catalítico.

Conclusiones:

  • Esta reacción UFC proporciona un nuevo método para la modificación de la amida en etapa tardía.
  • Las amidas pueden servir como grupos convertibles de dirección o protección utilizando esta metodología.
  • Los hallazgos amplían la utilidad sintética de las amidas en la química orgánica.