Fig. 5. (a) Overview of consumption of tetrahydrofuran with (^ArFL)Cu (4) (10 mol%) with C₆F₅N₃ in THF to afford the corresponding hemiaminal. (b) Relative rates of tetrahydrofuran amination with 4 (10 mol%) and 5 (10 mol%). (c) Eyring analysis of tetrahydrofuran amination with 4 (10 mol%).