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Electroreduction and Oxidation of Terephthalaldehyde and the Role of Hydration by M.S. Baymak; W.J. Bover; H. Celik; P. Zuman is a Engineering article available to read on EtoBox.

What is Electroreduction and Oxidation of Terephthalaldehyde and the Role of Hydration about?

Electroreduction of terephthalaldehyde (benzene-1,4-dicarboxaldehyde) (I) in protic media is complicated by acid-base and hydration-dehydration equilibria. At pH 0-5.5 the diprotonated form of I is reduced in a reversible two-electron step to a diradicalquinonemethide. This species is at pH 1-3 converted into an aldol (4-HOCH 2 C 6 H 4 CHO), which is further reduced at a more negative potential. At pH 5.5-8.5 the monoprotonated form is reduced. The protonated formyl group is reduced first and then, at a more negative potential, the second formyl group in the aldol, formed in the first step, is further reduced. As terephthalaldehyde is in aqueous solutions present in about 15% as a monohydrate, the limiting currents in this pH range are controlled by the hydration-dehydration equilibrium, the establishment of which is acid and base-catalyzed. The reduction of the unprotonated form occurs at pH > 8.5. At pH > 10 addition of OH -ions takes place. The formation of a geminaldiol anion results in a decrease of reduction waves of the aldehyde, but an increase in the oxidation anodic wave of the diol. Dependence of anodic waves on activity of OH -ions indicates a consecutive addition of OH

Who reads Electroreduction and Oxidation of Terephthalaldehyde and the Role of Hydration?

Author

M.S. Baymak; W.J. Bover; H. Celik; P. Zuman

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)