The reaction of N,N-diethylamino(cyclohexylphosphino)dimethylsilane 1 with the benzene solvate of copper(I) trifluoromethylsulfonate furnishes the title complex 2, which has been structurally characterized by X-ray diffraction; the same product results on conversion of bis(cyclohexylphosphino)dimethylsilane 3 with copper(I) trifluoromethylsulfonate in the presence of lithium diisopropylamide as an auxilliary base.