Catalytic Activation of Diazo Compounds Using Electron‐Rich, Defined Iron Complexes for Carbene‐Transfer Reactions

Carbene transfer: The electron-rich iron complex Bu4N[Fe(CO)3(NO)] efficiently catalyzes different carbene-transfer reactions. Various diazo compounds can be used. The high stability of the employed iron complexes is demonstrated by the generation of the diazo reagent in situ and a sequential iron-catalyzed allylic sulfenylation/Doyle–Kirmse reaction.