Kinetics of Reversible Cleavage of Thiazolium Salts

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概要

• 論文の詳細を見る

• Reversible cleavages of thiamine mononitrate (I), dimethialium mononitrate (II), 3,4-dimethyl-5-(2'-hydroxyethyl) thiazolium iodide (III), thiamic acid (IV) and N-methylbenzothiazolium iodide (V) were automatically followed by anodic waves of the thiol forms. Pseudo-first-order rate constants for the cleavage, (k_N) or the recyclization (k_S), are proportional to (OH^-) or (H^+), respectively. The pH where k_N is equal to k_S, corresponds to pK_<av> : 9.3 (I), 9.4 (II), 10.3 (III), 11.2 (IV) and 6.5 (V). Electron donating groups seem to stabilize the thiazolium rings for OH^- and to decrease the acidities.

• 公益社団法人日本薬学会の論文
• 1971-05-25

著者

• 永岡 道代

  Chemical Research Laboratories, Research and Development Division, Takeda Chemical Industries, Ltd.

• 朝日 豊

  Chemical Research Laboratories Central Research Division Takeda Chemical Industries Ltd.:(present Ad

• 永岡 道代

  Chemical Research Laboratories Research And Development Division Takeda Chemical Industries Ltd.

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