Abstract: The present invention relates to hydrosilylation reactions between a monosubstituted alkene compound and a compound comprising at least one hydrogen atom bonded to a silicon atom. More specifically, the invention relates to a process for hydrosilylation of an unsaturated compound A comprising at least one monosubstituted alkene function with a compound B comprising at least one hydrosilyl function, catalysed by a manganese complex C having the oxidation state I, in the presence of air and/or water. This hydrosilylation reaction between an alkene compound and a compound comprising at least one hydrogen atom bonded to a silicon atom makes it possible in particular to crosslink silicone compositions.

Abstract: The present invention relates to hydrosilylation reactions between a monosubstituted alkene compound and a compound comprising at least one hydrogen atom bonded to a silicon atom. More specifically, the invention relates to a process for the hydrosilylation of an unsaturated compound (A) that comprises at least one monosubstituted alkene function with a compound (B) that comprises at least one hydrosilane function, said process comprising the step of exposing said unsaturated compound (A) and said compound (B) to irradiation in the presence of a photocatalyst (C) consisting of a manganese carbonyl. This hydrosilylation reaction between an alkene compound and a compound comprising at least one hydrogen atom bonded to a silicon atom makes it possible, in particular, to cure silicone compositions by crosslinking.