Non‐Pincer‐Type Mononuclear Scandium Alkylidene Complexes: Synthesis, Bonding, and Reactivity

Abstract The first non‐pincer‐type mononuclear scandium alkylidene complexes were synthesized and structurally characterized. These complexes exhibited short Sc−C bond lengths and even one of the shortest reported to date (2.1134(18) Å). The multiple character of the Sc−C bond was highlighted by a DFT calculation. This was confirmed by experimental reactivity study where the complex underwent [2+1] cycloaddition with elemental selenium and [2+2] cycloaddition with imine. DFT calculation also revealed a strong nucleophilic behavior of the alkylidene complex that was experimentally demonstrated by the C−H bond activation of phenylacetylene.