Rhodia Chimie

Pierre Grenouillet

Pascale Colin

Philippe Morel

Claude De Bellefon

Christina Garcia-Escomel

The invention concerns a method for preparing hydrogenated alkylmonosilanes, by catalytic hydrogenolysis, under hydrogen pressure, of halogenoorganopolysilanes, improving known methods, in particular by facilitating implementation, and in terms of cost-effectiveness and performance which are shown by the efficiency of the resulting hydrogenated monosilanes. In said method the starting polysilanes are of the type: (CH,)Cl,Si&mdash;SiCl(CH,),; (CH,)Cl,Si&mdash;SiCl,(CH,); (CH,)Cl,Si&mdash;Si(CH,),; (CH,),ClSi&mdash;SiCl(CH,),; (CH,)Cl,Si&mdash;SiCl(Ch,)&mdash;SiCl,(CH,); (CH,)Cl,Si&mdash;Si(CH,)(SiCH,Cl,)&mdash;SiCl,CH,. The hydrogenated monosilanes CH,H,ClSi; (CH,),HClSi; CH,HCl,Si are obtained by contacting said polysilanes with gaseous hydrogen under pressure, in the presence of a catalytic system AB comprising a hydrogenation catalyst precursor A and an auxiliary B for dissolving precursor A in the reaction medium. Said catalytic system is further characterized in that it is reductant-free.

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Fontaines-sur-Saône, France

Pierre Grenouillet