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- W1543485995 abstract "3,7-Dimethyluric acid gives two voltammetric oxidation peaks (Ia and IIa) at a pyrolytic graphite electrode in aqueous solution. The peak Ia oxidation is a two-electron reaction giving a very unstable quinonoid cation that ultimately gives 4,8-dimethylallantoin as the sole organic product product at pH 7–9. At lower pH values 4-methyl-5-hydroxyhydantoin-5-carboxamide is also observed as a product. The peak IIa reaction is due to a Kolbe-type oxidation of the anion of 1-carbohydroxy-2,6-dimethyl-2,4,6,8-tetraaza-3,7-dioxo-5-ene-bicyclo [3.3.0] octane, an unstable peak Ia product. The expected tertiary alcohol product of this reaction is apparently unstable and undergoes further chemical and electrooxidation reactions to give two new products, 1-methyl-2,5-diketo-4-N-methylimino-imidazole and N(1)-methyl-N(1)′-amido-N(3)-N-methylamidourea. The oxidation of 3,7-dimethyluric between pH 5–7 follows the same chemical reaction pathways as is observed for the peak (a plus peak IIa electrooxidation processes." @default.
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- W1543485995 date "1984-10-01" @default.
- W1543485995 modified "2023-10-16" @default.
- W1543485995 title "Oxidation chemistry of 3,7-dimethyluric acid" @default.
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- W1543485995 doi "https://doi.org/10.1016/0022-0728(84)80219-3" @default.
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