Video Experimental Relacionado

Updated: May 2, 2026

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

Sililación intermolecular de C-H catalizada por el rodio de arenas con alto regiocontrol estérico

Chen Cheng¹, John F Hartwig

¹Department of Chemistry, University of California, Berkeley, CA 94720, USA.

Science (New York, N.Y.)

|February 22, 2014

Resumen

Este estudio introduce un nuevo método catalítico para la silición regioselectiva C-H de arenas. La reacción utiliza efectos estéricos remotos para una alta selectividad, creando versátiles bloques de construcción para la síntesis.

Área de la Ciencia:

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

Sus antecedentes:

La funcionalización regioselectiva de C-H es crucial en la química sintética.
Los métodos actuales a menudo se basan en grupos de dirección o obstáculos ortoestéricos.
Existe la necesidad de estrategias alternativas para controlar la selectividad regional.

Objetivo del estudio:

Para desarrollar una silición catalítica intermolecular C-H de arenas no activadas.
Para lograr una alta regioselectividad utilizando efectos estéricos remotos.
Para crear versátiles bloques de construcción de silylareno.

Principales métodos:

Reacción catalítica de silición intermolecular C-H.
Utilizado catalizador de rodio y silanos específicos.
Efectos estéricos investigados de meta-sustitutos en arenas.

Principales resultados:

Logró una regioselectividad muy alta en la silición C-H.
Se ha demostrado la regioselectividad controlada por meta-sustitutos.
Los productos de sililareno mostraron utilidad como bloques de construcción.

Conclusiones:

Se estableció un nuevo sistema catalítico para la silición regioselectiva de C-H.
Los efectos estéricos remotos, influenciados por el catalizador y el silano, controlan la regioselectividad.
El método desarrollado proporciona valiosos intermedios sintéticos.

Más Videos Relacionados

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Published on: August 17, 2018

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography

Published on: May 16, 2014

Videos de Conceptos Relacionados

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.

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

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...

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.