 This unusual reactivity is due to the presence of the highly strained three membered ring and the relatively weak N-O bond.Nucleophiles tend to attack at the aziridine nitrogen when the nitrogen substituent is small (R1= H), and at the oxygen atom when the nitrogen substituent has greater steric bulk.The unusual electronics of the oxaziridine system may be exploited to perform a number of oxygen and nitrogen transfer reactions including, but not limited to