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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...
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only in the...
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...

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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

Published on: February 20, 2020

Un disparador remoto de ácido de Lewis acelera dramáticamente la eliminación reductora de biarilo de un complejo de

Allegra L Liberman-Martin1, Robert G Bergman, T Don Tilley

  • 1Department of Chemistry, University of California - Berkeley, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|June 25, 2013
PubMed
Resumen

Este estudio introduce un nuevo método para controlar la densidad de electrones en los centros metálicos utilizando un interruptor químico remoto. Este enfoque acelera significativamente una reacción química clave, la eliminación reductora de biarilo, en más de 64.000 veces.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Coordinación Química de la Coordinación
  • La catálisis de la catálisis.

Sus antecedentes:

  • El control de la densidad de electrones en los centros metálicos es crucial para ajustar la reactividad.
  • Las interacciones de la segunda esfera ofrecen una vía para influir en la primera esfera de coordinación.
  • Los complejos de platino (II) son importantes en la catálisis y la ciencia de los materiales.

Objetivo del estudio:

  • Desarrollar una estrategia para el control electrónico remoto de los centros metálicos.
  • Para investigar el efecto de la unión del ácido de Lewis en la reactividad del complejo de platino.
  • Para mejorar la tasa de eliminación reductora de biarilo.

Principales métodos:

  • Síntesis de un complejo de bipirazina y diarilplatino (II).
  • Utilizando un interruptor químico remoto que involucra la unión del ácido de Lewis (B(C6F5)3).
  • Estudios cinéticos para medir las velocidades de reacción.

Principales resultados:

  • Demostró una modulación exitosa de la densidad de electrones a través de la unión de ácido de Lewis de segunda esfera.
  • Se observó una aceleración significativa de la eliminación reductora de biarilo por un factor de 64,000.
  • Estableció un método robusto para controlar la reactividad del centro del metal.

Conclusiones:

  • La unión remota de ácido de Lewis es una estrategia efectiva para el control electrónico de los centros metálicos.
  • Este método proporciona un control sin precedentes sobre las tasas de reacción en complejos organometálicos.
  • Los hallazgos tienen implicaciones para el diseño y desarrollo de catalizadores.