The homogeneous catalytic functionalization of methane is extremely challenging due to the relative nonpolarity and high C-H bond strength of this hydrocarbon. Here, using catalytic quantities (10 mol %) of CpMn(CO) or Cp*Re(CO), the conversion of methane and benzene C-H bonds to C-Be and H-Be bonds by CpBeBeCp has been achieved under photochemical conditions. Possible intermediates in the beryllation reactions─-bis(beryllyl)-manganese and -rhenium complexes─were also isolated. Quantum chemical calculations indicate that the inherent properties of the beryllyl ligands─which are powerfully σ-donating and feature highly Lewis acidic beryllium centers─are decisive in enabling methane functionalization by these systems.
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