チアクロモン1,1-ジオキシド類のボーラログラフィー
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概要
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Polarography of thiachromone 1,1-dioxide (I) derivatives was carried out and the relation between structures and half-wave reduction potentials (E_<1/2>) was examined. Compound I exhibits two polarographic waves at -0.431 and -1.096 V vs. S.C.E. (pH 6.4_5). It is concluded through controlled potential electrolysis that the 1st wave is the two-electron reduction wave of △^2 between SO_2 and C=O groups, and the 2nd wave is that of C=O. The 1st wave is a diffusion current and decreases in wave height at pH above 6 due to decomposition. The height of the 2nd wave increases with increase of pH up to 7,i.e. that is kinetic current, while the reduction wave of thiachromanone 1,1-dioxide (VI) is a diffusion current. It may be presumed that on polarographic reduction of I, VI is not produced directly from I but via any intermediate which depends on pH. Conjugation effect of SO_2 group and substituent effect on E_<1/2> of △^2 and C=O of thiachromone 1,1-dioxide derivatives are also discussed.
- 社団法人日本薬学会の論文
- 1968-12-25
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