Octabromophenylethyl-functionalized silsesquioxane (BrPh-SQ) was synthesized by the Friedel-Crafts alkylation of octavinylsilsesquioxane (OVS) with bromobenzene, which acted as both the solvent and reactant and, furthermore, could be recycled after the reaction. The approach possesses the advantages of being mild, economic, and highly efficient. Further, BrPh-SQ was used as a building block in Heck reactions