Rhodium(II,II) Dimer as an Efficient Catalyst for Aziridination of Sulfonamides and Amidation of Steroids LiangJiang-Lin YuanShi-Xue Wai Hong ChanPhilip CheChi-Ming 2002 Unsaturated sulfonamides underwent direct intramolecular aziridination catalyzed by Rh<sub>2</sub>(OAc)<sub>4</sub> with PhI(OAc)<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> to give the corresponding aziridine products in excellent yields (up to 98%) and with good to excellent conversions. High turnovers (up to 1375) were achieved. The intermolecular rhodium-catalyzed amidation of cholesteryl acetate with PhINTs or PhI(OAc)<sub>2</sub>/NH<sub>2</sub>R as the nitrogen source exhibited both excellent regio- and α-selectivity (α/β ratio up to 9:1).