Next, mechanistic studies were conducted. Initially, CV measurements were performed on 1a-H and EDA. The results revealed that the onset potential of 1a-H was 0.9 V, while that of EDA was 1.6 V (Figure ). Furthermore, the onset potentials of the other substrates utilized in this study were all below 1.6 V (Figure and SI 4.2), suggesting that the reaction progresses through the oxidation of substrates such as pyrroles and cyclopentadienes.