Hydrosilylation of alkenes with tertiary silanes under mild conditions by Pt(II)-vinyl complex supported on modified rice straw biochar

Alkylsilanes, obtained from hydrosilylation of alkenes with tertiary silane, have high commercial application value. It is crucial to develop a heterogeneous Pt-based catalyst with high activity and high regioselectivity to catalyze this hydrosilylation reaction under solvent-free and mild conditions. Herein, a stable Pt(II)-vinyl complex with unique structure was successfully constructed on oxidized rice straw biochar through reasonable structural design and modification steps. Pt particles on the as-prepared catalyst (Pt-VTES-RSOC) were evenly dispersed with relatively minimum particle sizes (0.3∼2.5 nm). Compared to classic homogeneous catalysts, Pt-VTES-RSOC showed superior activity, great regioselectivity for tertiary silanes and high reusability. The apparent kinetic models for representative reactions over Pt-VTES-RSOC were also proposed to simulate the catalytic process under suggested reaction conditions for clarifying the reaction mechanism. The study proved that Pt-VTES-RSOC would have a good industrial application potential in hydrosilylation of alkenes with tertiary silanes by reducing operation cost and increasing the product quality.