Reductive Cyclopropanations Catalyzed by Dinuclear Nickel Complexes

Abstract Dinuclear Ni complexes supported by naphthyridine‐diimine (NDI) ligands catalyze the reductive cyclopropanation of alkenes with CH 2 Cl 2 as the methylene source. The use of mild terminal reductants (Zn or Et 2 Zn) confers significant functional‐group tolerance, and the catalyst accommodates structurally and electronically diverse alkenes. Mononickel catalysts bearing related N chelates afford comparatively low cyclopropane yields (≤20 %). These results constitute an entry into catalytic carbene transformations from oxidized methylene precursors.