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- W4249966295 abstract "Over the pH range 2.3–10, 6-hydroxypteridine is oxidized electrochemically at the PGE by way of two voltammetric peaks. The first, least positive, peak is due to a 2e–2H+ oxidation to 6,7-dihydroxypteridine. In very acidic solution (2 M H2SO4), 7-hydroxypteridine álso gives two voltammetric peaks. Again the first, least positive, peak is a 2e–2H+ oxidation to 6,7-dihydroxypteridine. The second, more positive, peaks of both compounds are due to electrochemical oxidation of 6,7-dihydroxypteridine which occurs over the pH range of 2.3–9. Under voltammetric conditions this peak is due to a 2e–2H+ oxidation to a di-imine of 6,7-dihydroxypteridine that very rapidly hydrates to a diol. Under conditions of controlled potential electrolysis, however, the oxidation involves transfer of approximately 6e. Under the latter conditions the initial electrode product, the bridgehead diol of 6,7-dihydroxypteridine under goes rearrangement, further oxidation and hydrolysis yielding as final products, tetraketopiperazine, oxamide, urea, oxamic acid, ammonia, formaldehyde, formic acid and CO2. The electrochemical and related chemical reactions were studied by d.c. polarography, cyclic and linear sweep voltammetry, coulometry, and macroscale electrolysis followed by product isolation and identification, and radioisotope tracer techniques." @default.
- W4249966295 created "2022-05-12" @default.
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- W4249966295 date "1974-08-25" @default.
- W4249966295 modified "2023-09-30" @default.
- W4249966295 title "Electrochemical oxidation of 6- and 7-hydroxypteridine and 6,7-dihydroxypteridine at the pyrolytic graphite electrode" @default.
- W4249966295 doi "https://doi.org/10.1016/0368-1874(74)87112-1" @default.
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