Video Experimental Relacionado
Updated: Jul 11, 2026
12:05
Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
Published on: October 10, 2013
Un nuevo mecanismo para el deshidroacoplamiento de stannano catalizado por metales basado en la eliminación de alfa-H
1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, USA.
Journal of the American Chemical Society
|April 11, 2002
Resumen
Un nuevo complejo hidrostanílico de hafnio, CpCpHf(SnHMes(2)) Cl, actúa como intermediario en el deshidroacoplamiento catalizado por el metal de dimes(2) dihidruro de estaño. Este proceso implica la eliminación de estanileno y la inserción de Sn-H para la formación de enlaces Sn-Sn.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Grupo Principal Química.
- La catálisis por catálisis.
Sus antecedentes:
- Los hidruros de organotina son precursores versátiles en la química sintética.
- Las reacciones catalizadas por metales ofrecen vías eficientes para la formación de nuevos enlaces químicos.
Objetivo del estudio:
- Para sintetizar y caracterizar un complejo de hafnio hidrostanílico.
- Para aclarar el mecanismo de deshidroacoplamiento catalizado por el metal de dimes ((2) dihidruro de estaño.
Principales métodos:
- Síntesis de CpCpHf ((SnHMes ((2)) Cl a través de la reacción de CpCpHf ((H) Cl con Mes ((2) SnH ((2).
- Identificación del complejo de hafnio como intermediario en la reacción de deshidroacoplamiento.
Principales resultados:
- El complejo de hafnio CpCpHf(SnHMes(2)) Cl fue sintetizado con éxito.
- Este complejo fue identificado como un intermediario clave en el deshidroacoplamiento de Mes(2)SnH(2).
- El mecanismo de deshidroacoplamiento implica la eliminación de estanileno y la inserción de Sn-H.
Conclusiones:
- El complejo de hafnio sintetizado juega un papel crucial en el ciclo catalítico.
- El estudio proporciona información sobre la formación de enlaces Sn-Sn a través del deshidrocoplamiento catalizado por metales.
Más Videos Relacionados
Videos de Conceptos Relacionados
03:08Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
02:13Reduction of Alkenes: Catalytic Hydrogenation
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
02:17Reduction 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...
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...
02:24Reduction 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.
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.
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...