Video Experimental Relacionado

Updated: Jul 16, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Published on: February 11, 2012

La orto-etinilación catalizada por GaCl(3) de los fenoles

Katsumi Kobayashi¹, Mieko Arisawa, Masahiko Yamaguchi

¹Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan.

Journal of the American Chemical Society

|July 18, 2002

Resumen

Este estudio introduce un método catalítico eficiente para la ortoetinización de fenoles utilizando cloroetina y cloruro de galio (GaCl3) silulados. La reacción produce varios fenoles orto-etinileados sustituidos en grandes cantidades, lo que demuestra un enfoque sintético práctico.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis por catálisis.
Metodología sintética de la metodología sintética.

Sus antecedentes:

La fenilación del fenol es una transformación clave en la síntesis orgánica.
El desarrollo de métodos catalíticos eficientes y selectivos para la funcionalización directa del fenol sigue siendo un desafío.

Objetivo del estudio:

Desarrollar un nuevo sistema catalítico para la orto-etinilación directa de fenoles.
Investigar el mecanismo de reacción y el alcance de la metodología desarrollada.

Principales métodos:

Etinilación de fenoles utilizando cloroetileno silulado.
Catálisis con cloruro de galio (GaCl3) y fenóxido de litio.
Optimización de las condiciones de reacción y aditivos como la 2,6-di(tert-butilo) -4-metilpiridina.

Principales resultados:

Se lograron altos rendimientos de fenoles orto-etinilados para varios sustratos sustituidos.
Los números de facturación para GaCl3 oscilaron entre 8 y 10.
El mecanismo de reacción involucra intermediarios de fenoxigalio.

Conclusiones:

Se ha establecido un método robusto y eficiente para la ortoetinilación de fenoles.
El sistema catalítico demuestra una amplia aplicabilidad y una buena eficiencia.
El estudio proporciona información sobre el ciclo catalítico que involucra a las especies de galio.

Más Videos Relacionados

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Published on: July 9, 2015

Investigations on the Ga(III) Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue

Investigations on the Ga(III) Complex of EOB-DTPA and Its ⁶⁸Ga Radiolabeled Analogue

Published on: August 17, 2016

Videos de Conceptos Relacionados

Synthesis and Decomposition Reactions

Synthesis and Decomposition Reactions

Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes.

Predicting Molecular Geometry

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

Halogenation of Alkenes

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

Acid Halides to Ketones: Gilman Reagent

Acid Halides to Ketones: Gilman Reagent

Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen double...

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.