Copper-Catalyzed Conjugate Addition of a Bis(triorganosilyl) Zinc and a Methyl(triorganosilyl) Magnesium

A practical copper-catalyzed conjugate silylation of α,β-unsaturated carbonyl compounds 4 utilizing bis(triorganosilyl) zinc reagent 3 is described. Moreover, mixed methyl(triorganosilyl) magnesium 7 also transfers its silyl ligand to simple enones 4 under copper catalysis.