Silane hydrogenation reaction

Silane addition reaction. Involves a large amount of fundamental theories and techniques in organic chemistry and catalysis.

A reaction in which hydrides of silicon are added to unsaturated organic compounds to produce various organosilicon compounds. The hydrosilylation reaction features high yields, simple reaction equipment, ease of industrialization, the possibility of continuous production processes, and the ability to carry out addition polymerizations using silanes with alkenes, alkynes, or other unsaturated compounds (see addition polymerization of alkenes) to directly synthesize silicone polymers. 　　The silhydride formation reaction is generally carried out using one of the following three methods: ① Silane reacts directly with alkenes or alkynes at 300°C and under pressures of 100–500 atmospheres, resulting in oligomers (where Me represents a methyl group). nCH2CH2+MeCl2SiH—→MeCl2Si(CH2CH2)nH 　　② The hydrosilylation reaction is initiated using free radicals from ultraviolet light, gamma rays, or organic peroxides. 　　③Catalyzing hydrosilination reactions using transition metals and their complexes. This method features mild reaction conditions, typically carried out at room temperature or under solvent reflux. Commonly used catalysts include H2PtCl6·6H2O, (phCN)2PdCl2, (Ph3P)4Pd, (Ph3P)3RhCl, (Ph3P)2CORhCl, Co2(CO)8, Ni(CO)4, Cr(CO)6, Pd/C, Pt, etc. (Ph represents phenyl). Common solvents include isopropanol, **furan**, ethylene glycol dimethyl ether, and dimethyl phthalate, among others. In the hydrosilylation of carbon-carbon double bonds using H2PtCl6·6H2O as a catalyst, a platinene complex is formed first; at this stage, the silicon hydride adds to the platinum atom of the platinene complex, followed by a rearrangement reaction that results in the formation of Pt–C and C–H bonds. When another alkene is added, a reduction-elimination reaction occurs, yielding silhydride products – silanes – while the platinum alkene complex can be reused. Silhydride reactions are currently widely used in the preparation of a range of organosilicon compounds containing carbon-carbon double bonds, carbon-carbon triple bonds, carbon-oxygen double bonds, carbon-nitrogen double bonds, carbon-nitrogen triple bonds, nitrogen-nitrogen double bonds, and nitrogen-oxygen bonds. The hydrosilylation reaction is also used in the synthesis of natural organic compounds as a protecting group and reducing agent, among other things.