Related Experiment Video
Updated: Oct 17, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
A silica-supported tungsten-iridium hydride catalyst with enhanced arene H/D exchange performance
Andrey V Pichugov1, Oussama Fayafrou1, David Gajan1
1Université Lyon 1, CNRS, CPE Lyon, CP2M, UMR 5128, Villeurbanne 69616, France. clement.camp@univ-lyon1.fr.
Abstract:
While the synthesis of a molecular tungsten-iridium complex remains elusive, the silica-supported tungsten species, (SiO)W(CtBu)(CH2tBu)2, readily reacts with Cp*IrH4, leading to heterobimetallic surface sites, (SiO)W(CH2tBu)2(H)nIrCp*. This demonstrates the power of surface organometallic chemistry (SOMC) for assembling architectures that are otherwise inaccessible in solution. This silica-supported W-Ir material shows higher catalytic activity than Hf-Ir and Ta-Ir analogs in arene H/D exchange.
Related Concept Videos
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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...
Heterogeneous Catalysis
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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.
Reduction of Alkenes: 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...
Catalysis
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
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,...

