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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...
Elimination Reactions02:25

Elimination Reactions

A nucleophile can react with an alkyl halide to give the substitution product by displacing the halogen. Or it can function as a base to give the elimination product by deprotonation of the neighboring carbon to form an alkene. In an elimination reaction, the substrate loses two groups from adjacent carbons forming at least one π bond. The carbon attached to the halogen is called the α carbon, while the adjacent carbon is called the β carbon; hence, these reactions are called β elimination or...
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between the...
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Radical Formation: Elimination00:51

Radical Formation: Elimination

Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect to...
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...

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Eliminación reductiva de los complejos de cianuro de arilpaladio.

Jessica L Klinkenberg1, John F Hartwig

  • 1Department of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|February 23, 2012
PubMed
Resumen

Los investigadores aislaron complejos de cianuro de arilpaladio que forman arilnitriles a través de la eliminación reductora. Los grupos donantes de electrones aceleran este proceso, lo que difiere de otros complejos de arilpaladio.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Química sintética de la química sintética.

Sus antecedentes:

  • Los complejos de arylpalladium son intermediarios clave en la síntesis orgánica.
  • La comprensión de los mecanismos de eliminación reductiva es crucial para el diseño del catalizador.

Objetivo del estudio:

  • Para aislar y caracterizar los complejos de cianuro de arilpaladio.
  • Investigar el mecanismo y los efectos electrónicos que rigen la eliminación reductora de los arilnitriles.

Principales métodos:

  • Aislamiento y caracterización de nuevos complejos de cianuro de arilpaladio.
  • Estudios cinéticos para determinar las tasas reductivas de eliminación.
  • Estudios computacionales (DFT) para analizar los estados de transición.

Principales resultados:

  • Los complejos de cianuro de arilpaladio fueron sintetizados y caracterizados con éxito.
  • Las tasas de eliminación reductivas están influenciadas por los efectos electrónicos de los sustituyentes de arilo, con grupos donantes de electrones acelerando la reacción.
  • El estado de transición para la formación de arilnitril difiere significativamente de otros sistemas de arilpaladio y se asemeja a la inserción de CO en un enlace Pd-arilo.

Conclusiones:

  • Los efectos electrónicos en la eliminación reductora de los complejos de cianuro de arilpaladio son únicos.
  • El mecanismo de formación de arilnitril implica un estado de transición distinto.
  • Estos hallazgos ofrecen nuevos conocimientos sobre las reacciones de acoplamiento cruzado catalizadas por paladio y la síntesis de nitrilo.