Organosilicon compounds and organosilicon materials prepared from them have many varieties and excellent properties, and have been widely used in industrial and agricultural production, emerging technology, national defense and military industry and other fields. Hydrosilylation reaction refers to the addition reaction between Si-H group and unsaturated carbon carbon bond, but the most important is the addition reaction with C = C and C ≡ C bond to form Si-C bond with good hydrolytic stability. This is the most studied reaction in organosilicon chemistry. Many organosilicon monomers and polymers containing organic functional groups can be synthesized by hydrosilylation reaction. Compared with other methods, hydrosilylation has wider applicability and richer products, and hydrosilylation has the advantages of mild reaction, simple control, less side reactions, high product purity and yield, so it is widely used in industrial production.

The hydrosilylation mechanism includes free radical addition mechanism and coordination addition mechanism. The catalysts used include ultraviolet light

High temperature, peroxides, azo compounds, transition metal complexes and supported noble metal catalysts.

Homogeneous catalysts used in hydrosilylation include platinum catalyst, rhodium catalyst, ruthenium catalyst, palladium catalyst and other catalysts. Platinum catalyst mainly refers to chloroplatinic acid, which is the most common catalyst in hydrosilylation. It can catalyze the hydrosilylation of olefins, alkynes and carbonyl compounds.

There are three main types of hydrogen containing silanes used in hydrosilylation reaction: one is inorganic chlorosilanes, such as trichlorosilane, etc; Second, organochlorosilane, such as methyl hydrogen dichloride; The third is alkoxyhydrosilane, such as triethoxysilane. Hydrosilylation has been widely used in practical production.

Catalyst or initiator commonly used in hydrosilylation reaction

1) Platinum compounds such as chloroplatinic acid H2PtCl6 • 6H2O are universal catalysts;

2) Palladium compounds such as (ph3p) 4pd, (ph3p) 2pdcl2, (phcn) 2pdcl2;

3) Rhodium compounds such as [RhCl (CO) 2] 2, (ph3p) 2 (CO) RhCl, (et3p) 2 (CO) RhCl;

4) Nickel compounds such as (ph3p) 2nicl2 have their particularity;

5) Other metal compounds

6) Initiators such as UV, Υ X-ray, organic peroxide

7) Organic bases such as me2nch2ch2nme2 / bu3n / CuCl