The electrochemical reduction of quinoxalino [2, 3-b] quinoxaline gives fluoflavine (2) the structure of which is discussed. The electrochemical reduction of fluoflavine in acidic medium leads to a hexahydroquinoxalino [2, 3-b] quinoxaline. A reduction mechanism is proposed based on cyclic voltammetry results and preparative electrolysis. The results obtained in the case of quinoxalino [2, 3-b] quinoxaline are used to rationalize the results ...