Functionalization of spherosilicates via hydrosilylation catalyzed by well-defined rhodium siloxide complexes immobilized on silica

• Highly effective synthesis of functionalized silsesquioxane was performed.
• Rhodium complexes immobilized on the silica surface showed the high catalytic activity.
• Catalytic activity of the developed system is maintained after multiple use.

Well-defined rhodium siloxide complexes immobilized on silica ([(SiO)(SiOX)Rh(cod)](Aerosil 200) 1 and [(SiO)Rh(cod)(PCy3)](Aerosil 200) 2) synthesized via direct condensation of respective molecular precursors appeared to be very effective catalysts for quantitative synthesis of functionalized spherosilicates via direct hydrosilylation of olefins with octahydridospherosilicate. Catalyst 1 was also very active in subsequent hydrosilylation of two different olefins, which permitted efficient syntheses of spherosilicates with mixed functional groups of desired stoichiometric ratios. The catalysts were recycled at least 10 times without loss of efficiency in all the hydrosilylation processes performed.

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