Abstract The [5+ 2] and [6+ 2] cycloaddition reactions of vinylaziridines and vinylazetidines with ketenes generated photochemically from chromium (0) and molybdenum (0) Fischer carbene complexes have been investigated. These processes constitute a straightforward and efficient route to azepanones and azocinones, respectively. The peculiar electronic properties of the metalated ketenes allow for the introduction of electron-rich substituents ...
