Cu(II)-Mediated Generation of Triarylamine Radical Cations and Their Dimerization. An Easy Route to Tetraarylbenzidines
摘要:
Triphenylamine (TPA) derivatives react with Cu(2+) in acetonitrile to give TPA radical cations which undergo dimerization and deprotonation reactions to yield tetraphenylbenzidines (TPB). Synthetic utility of this reaction is demonstrated using several triphenylamine derivatives, and yields in excess of 80% are obtained in most cases. Involvement of the amine radical cations in these reactions was confirmed by ESR and absorption spectroscopic studies. A mechanism consistent with all observations is proposed. This study also revealed a very good correlation between the free energy change for radical cation formation and product yields.
Selective electrochemical <i>para</i>-thiocyanation of aromatic amines under metal-, oxidant- and exogenous-electrolyte-free conditions
作者:Ying Zhang、Huanjie Gao、Jiabao Guo、Hao Zhang、Xiaoquan Yao
DOI:10.1039/d1cc05208j
日期:——
An electrochemical oxidative para-C–H-thiocyanation of aromaticamines has been developed to construct thiocyanato aromatic compounds under metal-, oxidant-, and exogenous-electrolyte-free conditions in an undivided cell. The transformation is compatible with a range of primary, secondary, and tertiaryamines and shows good functional group tolerance. This approach provides an economical and environmentally