Fig. 4. Mechanism for initial two-electron reduction of NFSI by LCuIBr (1-Br), which results in one-electron oxidation of the mono-nuclear CuI complex and a one-electron oxidation of the bromide ligand to a bromine radical. The signs of the explicitly depicted spins were assigned arbitrarily. Relative energies are given as ΔG/ΔH in kcal mol–1.
