Further investigations reveal that the dienes and trienes typically only react at one olefin site to yield monoaziridination products even though increasing the amount of HOSA and the base does not lead to bis-aziridination. For instance, using piperidine as base under condition [A], 1,5cyclooctadiene (COD, 20s) gave the desired aziridines in 66% yield and dicyclopentadiene 21s provided the two separable products ) in a total 86% yield (53% and 33%, respectively). Under condition , the 𝛾-Terpinene yielded inseparable products 22+22' in a total 85% yield (22:22' = 1:1.8, detected by 1 H NMR). Tetra-substituted olefin terpinolene 23s as a substrate under conditions [A] yielded product 23 in 83%, with the reaction scalable to 10 mmol in 93% yield. Trienes, such as myrcene 24s was also well accommodated in this system, with the reaction specifically occurring at the electron-rich internal olefin, leaving the two terminal olefins unreacted.