Video Experimental Relacionado

Updated: Jun 14, 2026

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

La activación C-H mediada por el oro (I) de los arenos

Pengfei Lu¹, Tanya C Boorman, Alexandra M Z Slawin

¹School of Biological and Chemical Sciences, Joseph Priestley Building, Queen Mary University of London, Mile End Road E1 4NS, London, UK.

Journal of the American Chemical Society

|April 7, 2010

Resumen

Este estudio muestra la primera activación C-H mediada por oro de arenas. A diferencia del oro, el oro selectivamente activa arenas pobres en electrones bajo condiciones suaves, produciendo valiosos complejos oro-areno.

Área de la Ciencia:

Química organometálica Química orgánica de los metales.
La catálisis de la catálisis.
Síntesis orgánica La síntesis orgánica.

Sus antecedentes:

La activación de C-H es una transformación crucial en la síntesis orgánica.
La catálisis del oro ha surgido como una poderosa herramienta para diversas reacciones químicas.
Las anteriores activaciones de C-H mediadas por oro involucraron principalmente a especies Au.

Objetivo del estudio:

Para reportar la primera instancia de activación C-H mediada por oro de arenas.
Para investigar la reactividad de las sales Au(I) con diferentes sustratos de areno.
Establecer un método suave y regioselectivo para la síntesis de complejos Au{I}-areno.

Principales métodos:

Reacción de las sales de oro (I) con varios arenos en condiciones suaves.
Caracterización de los complejos oro-areno resultantes.
Comparación de la selectividad de la activación C-H mediada por Au(I) y Au(III.

Principales resultados:

Las sales de oro ((I) activan selectivamente los enlaces C-H en arenas pobres en electrones.
Esto contrasta con las sales Au (III), que activan arenas ricas en electrones.
El proceso es operacionalmente simple, altamente regioselectivo, y se lleva a cabo en condiciones suaves.
Se obtuvieron excelentes rendimientos de varios complejos Au ((I) -areno.

Conclusiones:

El oro (I) ofrece un perfil de reactividad distinto y complementario al oro (III) en la activación C-H.
Este descubrimiento proporciona una nueva ruta sintética a valiosos complejos de Au (I) -areno.
El método desarrollado ofrece un enfoque suave y eficiente para la síntesis organometálica.

Más Videos Relacionados

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators

A Kinetic Fluorescence-based Ca²⁺ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators

Published on: February 20, 2018

BRET-based G Protein Biosensors for Measuring G Protein-Coupled Receptor Activity in Live Cells

BRET-based G Protein Biosensors for Measuring G Protein-Coupled Receptor Activity in Live Cells

Published on: November 7, 2025

Videos de Conceptos Relacionados

Activation and Inactivation of G Proteins

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

GPCRs Regulate Adenylyl Cylase Activity

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

ortho–para-Directing Activators: –CH3, –OH, –&NoBreak;NH2, –OCH3

ortho–para-Directing Activators: –CH₃, –OH, –⁠NH₂, –OCH₃

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

cAMP-dependent Protein Kinase Pathways

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...

G-Protein Gated Ion Channels

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...