Direct control experiments revealed that no desired product 3 was obtained in the absence of electric current or Fe catalyst (entries 1-2). In addition, the yield was significantly reduced to 10% when a sacrificial Zn electrode was used as the anode electrode instead of a carbon plate (entry 3). According to this result, it can be concluded that the oxidation reaction at the anode electrode is necessary for this reaction. When 9 mA was used as the constant current or only10 mol% catalyst was used in this reaction, the yield decreased (entries 4-5). Fe catalysts were also investigated. When Fe(acac)2 was applied instead, the reaction proceeded, but only 34% yield was obtained (entry 6). In general, Fe(acac)2 has two acac ligands coordinated to Fe, making it very unfavorable for other ligands to coordinate. When FeCl3 was used, the yield decreased to 37% (entry 7) probably due to FeCl3 is more hygroscopic than FeCl2, making it difficult to handle, and thus the small amount of water in the reaction system may be the cause of the low yield. Another controlled experiment was performed on the ligand effect of this reaction, only 20% yiled of the desired product 3 was obtained in the ligand-free condition (entry 8). A range of ligands (L2-L7) were screened sequently, and it proved to be ineffective for this reaction in terms of yield (entries 9-14). It is worth mentioning that the use of nBu4NBF4 (0.5 eq.) as electrolyte in this reaction led to higher yield (entry 15). Next, the halogen sources were investigated, which play the dual role of not only halogen source but also electrolyte. It was found that the yield decreased using TBAI or NaI (entries 16-17). This is probably due to the high reactivity of the alkyl iodide generated in the reaction system, which may cause side reactions such as reduction and elimination. Furthermore, this reaction did not proceed at all when PPh3 was not used (entry 18). To confirm the solvent effect, NMP used very frequently in electrochemical reactions, was tested in this reaction, but the yield dropped to 16% (entry 19). And when the reaction was performed under air, the yield was less than 5% (entry 20).