Detection of a Radical Cation of an NADH Analogue in Two-Electron Reduction of a Protonated p-Quinone Derivative by an NADH Analogue

摘要

Dihydronicotinamide coenzyme(NADH)plays a vital role as a source of two electrons and a proton(equivalent to a hydride ion)in a number of biological redox processes.On the other hand,quinones(Q)act as biological electron acceptors that can undergo either one-or two-electron reductions coupled with protonation to afford the corresponding semiquinones(QH~·)and hydroquinones(QH2),respectively.