Recent Highlights in Ketenimine Chemistry

Abstract Selected recent developments in the chemistry of ketenimines are presented, demonstrating that heterocumulenes of this class are versatile reactive intermediates in the synthesis of nitrogenated heterocycles. This microreview includes examples of intramolecular nucleophilic and radical additions, biradical cyclizations, 4π‐ and 6π‐electrocyclic ring closures, [2+2], [3+2] and [4+2] cycloadditions, ketenimine‐to‐nitrile rearrangements and 1,3‐X, 1,5‐X and 1,5‐H shifts.