Abstract Hydrosilylation reaction of allyl acetate (AA) with octakis (dimethylsiloxy) octasilsesquioxane [(HSiMe 2 O) 8 (SiO 1.5) 8] was efficiently catalyzed by chloro (1, 5- cyclooctadiene) iridium (I) dimer [Ir (μ-Cl)(COD)] 2. The effects of the catalyst amounts and the reaction conditions on the conversion and the product selectivity were investigated.[Ir (μ- Cl)(COD)] 2 catalyst was also applied to the hydrosilylation reaction of AA with other ...