The preparation of different [N-(arenesulfonyl)imino]phenyliodinones is described, along with an evaluation of their utility as nitrene precursors for the copper-catalyzed aziridination of different olefins. The best results were obtained with p-NO 2 -C 6 H 4 SO 2 N=IPh and p-MeO-C 6 H 4 SO 2 N=IPh, both of which were found superior to PhI=NTs, which previously has been the reagent of choice for this type of reaction. The corresponding aziridine derivatives were obtained in good to excellent yields (60–99%) using 1.0 equivalent of olefin and 1.5 equivalents of the nitrene precursor.