In addition to structure analysis and spectroscopic characterization, we investigated the reactivity of the anionic cyanoketene. It is noteworthy, that 2 is one of very few stable, small molecules that only consist of carbon, oxygen and nitrogen. Giving the limited number of isolable small molecules known with these elements, the stability of 2 is particularly remarkable. Although salts of 2 must be handled under anhydrous reaction conditions to prevent protonation, it is stable at room temperature as solid for months. No dimerization or oligomerization of 2 is observed due to its negative charge, which results in a reduced ambiphilicity compared to for example neutral ketenes, which therefore tend to dimerize. In contrast, 2 can be stored as a solid and handled in chlorinated solvents, such as dichloromethane or chloroform, and in coordinating solvents like acetonitrile or THF, although it shows poor solubility in the latter. Only after prolonged storage at elevated temperatures in solution (3 days, > 50 °C), the cyanoketene anion undergoes solvent activation. This stability of 2 facilitates and handling and storage, but also enables its application as a highly functional reagent.