Pablo M. Pérez GarcíaMaría L. G. Sansores‐ParedesCélia Fonseca GuerraPascal VermeerenMarc‐Etienne Moret2026-03-222026-03-22202410.26434/chemrxiv-2024-pdbsm-v2https://doi.org/10.26434/chemrxiv-2024-pdbsm-v2https://andeanlibrary.org/handle/123456789/83628Citaciones: 1Nickel carbenes are key reactive intermediates in the catalytic cyclopropanation of olefins and other reactions, but isolated examples are scarce and generally rely on low coordination numbers (≤ 3) to stabilize the metal–ligand multiple bond. Here we report the isolation and characterization of a stable tetracoordinated nickel carbene bearing a triphosphine pincer ligand. Its nucleophilic character is evidenced by reaction with acids, and it can transfer the carbene fragment to CO to form a ketene. A computational study of the Ni=C chemical bond sheds light on the role of the third phosphine in the pincer framework to the stabilization of the nickel carbene fragment.enCarbeneReactivity (psychology)NickelChemistryPolymer chemistrypreprint