Alkene hydrosilylation catalyzed by Ru(PPh₃)₃Cl₂ in ionic liquids/organic solvents and Rh(PPh₃)₃Cl in ionic liquids was studied in this paper. Both catalytic activity and selectivity of Ru(PPh₃)₃Cl₂ were improved in ionic liquid BMImPF₆/DME medium. The conversion of hexene and selectivity of β-adduct for the hydrosilylation reaction of 1-hexene with triethoxysilane catalyzed by Ru(PPh₃)₃Cl₂ in ionic liquid BMImPF₆/DME (V/V＝1/4) medium at 90 ℃ were 100% and 89.0%, respectively. While the conversion of hexene and selectivity to β-adduct catalyzed by Rh(PPh₃)₃Cl in sole BMImPF₆ at 90 ℃ were 100% and 99.9%, re-spectively. The Rh(PPh₃)₃Cl in BMImPF₆ catalyst system could be recovered easily and be reused more than three times without noticeable loss of its catalytic activity and selectivity.Alkene hydrosilylation catalyzed by Ru(PPh₃)₃Cl₂ in ionic liquids/organic solvents and Rh(PPh₃)₃Cl in ionic liquids was studied in this paper. Both catalytic activity and selectivity of Ru(PPh₃)₃Cl₂ were improved in ionic liquid BMImPF₆/DME medium. The conversion of hexene and selectivity of β-adduct for the hydrosilylation reaction of 1-hexene with triethoxysilane catalyzed by Ru(PPh₃)₃Cl₂ in ionic liquid BMImPF₆/DME (V/V＝1/4) medium at 90 ℃ were 100% and 89.0%, respectively. While the conversion of hexene and selectivity to β-adduct catalyzed by Rh(PPh₃)₃Cl in sole BMImPF₆ at 90 ℃ were 100% and 99.9%, re-spectively. The Rh(PPh₃)₃Cl in BMImPF₆ catalyst system could be recovered easily and be reused more than three times without noticeable loss of its catalytic activity and selectivity.

Key words: hydrosilylation, rhodium complex, ruthenium complex, ionic liquid