After the migratory insertion, intermediate A6 undergoes subsequent oxidative N-O bond cleavage, forming the Rh(V) intermediate A7. Leveraging the electron-deficient environment in A7 as a driving force, the reductive C-N bond formation readily takes place with step barriers of 7.3 and 9.8 kcal/mol for S A7-TS and R A7-TS, respectively. Finally, the dissociation of the aziridine product from A8 regenerates the pivalate analog of active catalyst A1, which can initiate a new catalytic cycle.