Fig. 3. (A) Outline of the proposed mechanisms with the acridinium- (left) and Ir-based (right) photocatalysts. (B) Steady-state fluorescent quenching and electrochemical measurements. (C) Calculated structures with selected bond distances (Å) for the s-cis and s-trans-1 conformers of N-sulfinyl imine 1. (D) Gibbs free energy and enthalpy diagrams for tert-butyl radical addition to 1, and calculated structures for the re-TS and si-TS transition states.
