Video Experimental Relacionado
Updated: Mar 18, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
12.8K
Cooperatividad significativa entre rutenio y silicio en las transformaciones catalíticas de un isocyanuro
Mark C Lipke1, Allegra L Liberman-Martin1, T Don Tilley1
1Department of Chemistry, University of California , Berkeley, California 94720, United States.
Journal of the American Chemical Society
|July 8, 2016
Resumen
Los complejos de rutenio con múltiples enlaces metal-hidrógeno-silicio median las transformaciones de isocyanuro. Estas reacciones muestran silicio
Área de la Ciencia:
- Química organometálica
- Catálisis
- Química del silicio
Sus antecedentes:
- Los complejos de rutenio con enlaces M-H-Si son catalizadores conocidos.
- Los isocyanuros son sustratos insaturados versátiles en la síntesis orgánica.
Objetivo del estudio:
- Investigar la reactividad de los complejos de rutenio con múltiples enlaces M-H-Si hacia los isocyanuros.
- Para dilucidar los mecanismos de las transformaciones de isocyanuro mediadas por estos complejos.
- Explorar el papel del silicio en las reacciones catalizadas por metales de transición.
Principales métodos:
- Síntesis y caracterización de los complejos rutenio-silano.
- Reacciones con isocyanuros bajo condiciones controladas.
- Etiquetado con deuterio, estudios de efecto isotópico cinético (KIE) y espectroscopia de RMN.
Principales resultados:
- Formación de complejos de carbenos a partir de complejos de rutenio y isocyanuros.
- El complejo 2a produjo un producto de silacicloindolina a través de hidrosilación, hidrogenación y activación de C-H.
- El complejo 1c cataliza el acoplamiento reductor de isocyanuro para formar un alqueno.
- Los estudios mecanicistas revelaron la participación de varias especies de coordinación de silicio.
Conclusiones:
- Los complejos de rutenio-silano pueden mediar transformaciones complejas de isocyanuro, incluidas las reacciones pseudocatalizadoras y catalíticas.
- El silicio juega un papel complejo, participando a través de múltiples modos de coordinación y enlaces M-H-Si.
- Estos hallazgos amplían la comprensión de la utilidad del silicio en la catálisis de metales de transición.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.0K
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...
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...
4.0K
01:22Heterogeneous Catalysis
75
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
75
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.3K
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.
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.
9.3K
01:20Radical Reactivity: Concentration Effects
1.9K
In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
1.9K
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
7.9K
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...
7.9K
02:50Catalysis
31.8K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
31.8K