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Videos de Conceptos Relacionados

Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

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Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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Electrophilic Aromatic Substitution: Friedel–Crafts Alkylation of Benzene01:17

Electrophilic Aromatic Substitution: Friedel–Crafts Alkylation of Benzene

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Friedel–Crafts reactions were developed in 1877 by the French chemist Charles Friedel and the American chemist James Crafts. Friedel–Crafts alkylation refers to the replacement of an aromatic proton with an alkyl group via electrophilic aromatic substitution. A Lewis acid catalyst such as aluminum chloride reacts with an alkyl halide to form a carbocation. The resulting carbocation then reacts with the aromatic ring and undergoes a series of electron rearrangements before giving the final...
8.7K
Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene01:11

Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene

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The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
10.1K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

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3.7K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
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Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

4.4K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
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Acid Halides to Esters: Alcoholysis01:12

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Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
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Formación de iones de silicio estabilizados por el ácido de Brønsted para la silición catalítica de Friedel-Crafts

Qing-An Chen1, Hendrik F T Klare1, Martin Oestreich1

  • 1Institut für Chemie, Technische Universität Berlin , Strasse des 17. Juni 115, 10623 Berlin, Germany.

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|June 16, 2016
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Los investigadores desarrollaron un nuevo método para la silificación de C-H utilizando electrófilos de silicio, superando las limitaciones típicas de la reacción. Un ácido fuerte inicia esta sustitución aromática electrofílica, lo que permite una eficiente funcionalización del silicio de las arenas.

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Área de la Ciencia:

  • Química orgánica
  • Química del silicio orgánico

Sus antecedentes:

  • La sustitución aromática electrofílica (EAS) es una reacción orgánica fundamental.
  • La protodesilación, el reverso de la sililación, es típicamente favorecida por los ácidos fuertes.
  • La silición directa C-H de los arenos sigue siendo un desafío, especialmente con los electrófilos de silicio.

Objetivo del estudio:

  • Para revelar un enfoque contrario a la intuición para la sustitución aromática electrófila utilizando electrófilos de silicio.
  • Para permitir la silición directa C-H de las arenas ricas en electrones (hetero) con los hidrosilanos.
  • Para superar las limitaciones de los ácidos fuertes en la promoción de reacciones de silificación.

Principales métodos:

  • Utilizando un fuerte ácido de Brønsted para iniciar la reacción.
  • El uso de hidrosilanos como precursores electrófilos del silicio.
  • Investigando el mecanismo que implica la protonación y la liberación de dihidrógeno.

Principales resultados:

  • Un fuerte ácido de Brønsted inició con éxito la silición de C-H, contrariamente a las expectativas.
  • La reacción se produjo con arenas ricas en electrones (hetero).
  • La protonación del hidrosilano y la posterior liberación de dihidrógeno se identificaron como pasos cruciales.

Conclusiones:

  • El método desarrollado proporciona una estrategia eficaz para la silificación de C-H.
  • La vía mecanicista que implica la generación de iones de silicio y la eliminación de protones es clave.
  • Este enfoque ofrece una nueva ruta para la funcionalización de sistemas aromáticos basados en silicio.