Abstract
The electŕochemical reduction of phenazine, P, in tetrahydrofuran is examined when no proton donor is added. The anion radical obtained after the first electron uptake is stable. The dianion is slowly protonated by residual water to PH −, which is deprotonated, upon reoxidation , by the OH − ions. Upon addition of proton donors of increasing strength, protonation of the species P −2, P .−, PH − and P is observed. The neutral radical PH . gives very rapidly, via an antidisproportionation, P and PH 2. The different reduction mechanisms are discussed.
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