The synthesis and investigation of the reactivity of molecules detected in interstellar environments are crucial for comprehending the formation of life-related molecules from simpler ones. Additionally, exploring their reactivity can offer valuable insights for the radio-astronomy detection of related compounds. (Hetero)cumulenes and nitrilecontaining molecules have been widely identified in interstellar space. The quest for cyanoketene (NCCHCO, Scheme 1a) has garnered significant attention due to its simplicity and its incorporation of the four fundamental elements for life-related molecules. Scheme 1: (a) Cyanoketene, and resonance structures and geometries of cyanoketenate. (b) Prior literature on formation of anionic ketenates from CO. (c) This work on the synthesis of [NCCCO] -cyanoketenate anion.