Thereby, passivation of the platinum cathode was no further observed, which along with the detection of molecular hydrogen via headspace GC analysis (Fig. ) highlighted the efficient HER as the cathodic half reaction. Most user-friendly galvanostatic conditions proved viable through slight adjustments (entry 3). Interestingly, when silver carbonate was used as a chemical oxidant in lieu of electricity under otherwise identical conditions (entry 4), a very low enantioselectivity was obtained. The product formation was not found in the absence of electricity (entry 5), indicating the unique role of electricity beyond serving as redox equivalent in the cobaltaelectro-catalyzed C-H activation. Thereafter, various chiral phosphoric acids were explored (Fig. and). Counterintuitively, the best result was indeed obtained with the easily accessible parent BINOL phosphoric acid CPA1, while decorated derivatives CPA2 (entry 6), CPA3 (entry 7) and SPINOL CPA4 (entry 8) with substituents at the 3,3'-position exhibited a deteriorating effect on the enantiomeric excess (Fig. ).