Air-stable and reusable cobalt ion-doped titanium oxide catalyst for alkene hydrosilylation

Abstract

Alkene hydrosilylation is important for the synthesis of organosilicon compounds, for which precious metal complexes have been used as industrial catalysts. Considering environmental and economic concerns, the development of earth-abundant metal catalysts with high stability, easy separability, and high reusability is strongly desired. Herein, we report that a new cobalt ion-doped titanium dioxide (Co/TiO₂) catalyst was synthesized by hydrogen treatment method. The Co/TiO₂ catalyst acts as a highly efficient heterogeneous catalyst for the anti-Markovnikov hydrosilylation of alkenes under solvent-free conditions. Various alkenes were selectively converted to the corresponding alkylsilanes. This catalyst showed high stability in air and high reusability with maintained activity. The investigation of the relationship between the active site structure and catalytic performance of Co/TiO₂ disclosed that the high stability and durability of Co/TiO₂ are originated from the strong interaction between Co and TiO₂ through the formation of CoTiO₃ solid solution species.