Video Experimental Relacionado

Updated: Jul 20, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

La adición de ciclo [3 + 2] intramolecular catalizada por oro de las funcionalidades arenyne-yne

Jian-Jou Lian¹, Po-Chiang Chen, Yau-Ping Lin

¹Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan, Republic of China.

Journal of the American Chemical Society

|August 31, 2006

Resumen

Una nueva reacción catalizada por oro crea eficientemente moléculas complejas a partir de precursores simples. Esta cicloadición intramolecular es efectiva para varios sustratos de diine bajo condiciones suaves.

Área de la Ciencia:

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

Sus antecedentes:

Las cicloadiciones intramoleculares son potentes herramientas para la construcción de moléculas orgánicas cíclicas.
El desarrollo de sistemas catalíticos eficientes para sustratos no activados sigue siendo un desafío en la síntesis orgánica.

Objetivo del estudio:

Para reportar una nueva y eficiente reacción intramolecular de [3+2]-cicloadición.
Para demostrar la utilidad de la catálisis del oro para esta transformación.

Principales métodos:

Utilizando el complejo AuPPh3SbF6 como catalizador (2 mol %).
Llevar a cabo la reacción en condiciones ambientales.
Empleando una gama de sustratos de diine con diversos grupos funcionales.

Principales resultados:

Se logró una eficiente adición ciclo [3+2] intramolecular [3+2] de las funcionalidades no activadas de arenyne (o enyne) -yne.
Demostró un amplio alcance de sustrato, tolerando varios grupos funcionales en los materiales de partida diyne.
La reacción se desarrolla eficazmente bajo condiciones ambientales suaves.

Conclusiones:

La cicloadición catalizada por oro reportada ofrece un valioso nuevo método para sintetizar estructuras orgánicas complejas.
La eficiencia de la reacción y la tolerancia al grupo funcional lo convierten en una herramienta versátil para los químicos sintéticos.

Más Videos Relacionados

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species

Published on: August 16, 2018

Videos de Conceptos Relacionados

Cycloaddition Reactions: Overview

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Preparation of Alkynes: Alkylation Reaction

Preparation of Alkynes: Alkylation Reaction

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.

Conjugate Addition to α,β-Unsaturated Carbonyl Compounds

Conjugate Addition to α,β-Unsaturated Carbonyl Compounds

α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.

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

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

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.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.