Oxidative Addition of Phenylacetylene through CH Bond Cleavage To Form the Mg II –dpp‐bian Complex: Molecular Structure of [Mg{dpp‐bian(H)}(CCPh)(thf)2] and Its Diphenylketone Insertion Product [Mg(dpp‐bian).−{OC(Ph2)CCPh}(thf)]

The use of a rigid bidentate ligand allows oxidative addition of an acetylene derivative to a non-transition-metal complex, not through oxidation of the metal atom, but through σ-bond metathesis from ML: and HC to form HL⋅⋅⋅MC (see scheme; Ar=2,6-iPr2C6H3).