We report herein a photo induced Co-catalyzed aerobic N−N coupling of diarylamines to form the corresponding tetraarylhydrazines. In this protocol, the N−N coupling reactions could be realized under mild conditions in the presence of Co(OAc)2 ⋅ 4H2O and BPhen with the irradiation of light (390–395 nm).

https://onlinelibrary.wiley.com/doi/abs/10.1002/ajoc.202200553