The silicon-hydrogen addition reaction refers to the addition reaction between an organosilicon compound containing silicon-hydrogen bonds and a compound containing unsaturated bonds under certain conditions. It is the main form of silicon-carbon bond formation and the most important reaction in organosilicon chemistry. One of the types, the reaction conditions are mild, and the reaction efficiency is high. It can be widely used in the synthesis of organohalosilane, the preparation of modified silicone oil, the synthesis of silane coupling agents, the synthesis of liquid silicone rubber and the synthesis of some functional organosilicon materials.

      The unsaturated bond in the hydrosilylation reaction may be a carbon-carbon double bond, a carbon-carbon triple bond, a carbon-oxygen double bond, a carbon-nitrogen double bond, and the like. Among them, the addition reaction between the silicon-hydrogen bond and the carbon-carbon double bond is the most common silicon-hydrogen addition reaction in the organosilicon industry.

      According to the different catalytic system of the reaction, the hydrosilylation reaction is divided into two types: free radical addition mechanism and coordination addition mechanism. Under the conditions of ultraviolet, high temperature, γ-rays, peroxides, azo compounds, etc., the silicon-hydrogen addition reaction proceeds according to the radical addition mechanism; under the action of transition metal catalysts such as platinum, palladium, rhodium, and nickel, the The coordination addition mechanism proceeds. Due to the high activity and selectivity of transition metal catalysts, common hydrosilylation reactions are mainly carried out under the catalysis of transition metal catalysts, among which platinum catalysts are the most used transition metal catalysts.