水田除草剤ピラゾレートの水溶液中における加水分解

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site Web Site 被引用文献1件
  • 山岡 剛
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 中川 昌之
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 石田 三雄
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.

書誌事項

タイトル別名
  • Hydrolysis of the Rice Herbicide Pyrazolate in Aqueous Solutions
  • スイデン ジョソウザイ ピラゾレート ノ スイヨウエキチュウ ニ オケル カス

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抄録

Hydrolysis of pyrazolate, [4-(2, 4-dichlorobenzoyl)-1, 3-dimethylpyrazol-5-yl] p-toluenesulfonate, was studied in buffer solutions in a range of pH 1.0-9.0 at 25°C, and in artificial gastric and intestinal fluids (pH 1.5 and 7.5) at 37°C. The hydrolysis proceeded predominantly through base- and acid-catalyzed processes in the regions above pH 7 and below pH 3, respectively, whereas both reactions occurred between pH 3 and pH 7. The half-life (hr) of pyrazolate ranged from 4.3 (pH 9.0) to 106.0 (pH 5.0) at 25°C, and was 2.3 (pH 7.5) and 7.8 (pH 1.5) at 37°C. Hydrolysates of pyrazolate in the wide range of pH at both temperatures were p-toluenesulfonic acid and 4-(2, 4-dichlorobenzoyl)-1, 3-dimethyl-5-hydroxypyrazole; i. e., destosyl pyrazolate (DTP).

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