The reduction mechamsm of 2,5-bls(I-aund~nyl)-3,6-bls(ethoxycarbonylam~no)-I,4-benzoqulnone (Dlauquone, AZQ) and several model compounds of the mono-and bls(l-azlndmyl)qumone type at the droppmg mercury electrode m aqueous solutions was studied In addltlon, the influence of methyl substltutlon of the azmdmyl moiety at the 2-posltlon on the protonatlon of the avndme mtrogen was mvestlgated Substltuent effects on qumone reduction and avndme protonatlon pnor to and followmg qumone reduction were studied qualitatively
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