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Videos de Conceptos Relacionados

Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

10.7K
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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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
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...
4.1K
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...
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Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

2.7K
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
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

3.5K
α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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La fluoroalquilación carbonilativa catalizada por el paladio de 1,3-Enynes para acceder a las amidas primarias de

Chang-Sheng Kuai1,2, Ru-Han A1,3, Zhi-Peng Bao1,3

  • 1Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Organic letters
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Los investigadores desarrollaron una nueva reacción catalizada por el paladio para la carbonilación fluoroalquilada difuncional. Este método sintetiza eficientemente amidas primarias de allenilo fluoroalquiladas a partir de 1,3-eninos, ofreciendo un amplio alcance y una alta selectividad.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Química del fluor

Sus antecedentes:

  • Las reacciones catalizadas por el paladio son cruciales en la síntesis orgánica.
  • Los compuestos fluoroalquilados tienen aplicaciones significativas en productos farmacéuticos y ciencias de los materiales.
  • Los métodos eficientes para la introducción de grupos fluoroalquilo son muy buscados.

Objetivo del estudio:

  • Desarrollar una nueva reacción de carbonilación fluoroalquilada difuncional catalizada por el paladio.
  • Para sintetizar las amidas primarias de allenilo fluoroalquiladas.
  • Explorar el alcance y las limitaciones de la nueva metodología.

Principales métodos:

  • Utilizando las 1,3-eninas como sustratos.
  • Empleando la catálisis de paladio.
  • Reaccionan con haluros de fluoroalquilo y yoduro de amonio.

Principales resultados:

  • Síntesis exitosa de amidas primarias de allenilo fluoroalquiladas.
  • Se ha demostrado un amplio alcance del sustrato.
  • Se ha logrado una alta quimioselectividad y regioselectividad.
  • Se ha demostrado una buena tolerancia funcional del grupo.

Conclusiones:

  • Se ha establecido un nuevo y eficiente método catalizado por el paladio para la carbonilación fluoroalquiladora.
  • El protocolo desarrollado proporciona un acceso rápido a las valiosas amidas primarias de allenilo fluoroalquiladas.
  • La reacción muestra una excelente selectividad y tolerancia de grupo funcional, lo que la convierte en una herramienta sintética versátil.