高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (12): 1883.

• 论文 • 上一篇    下一篇

采用电位滴定法在DMSO/H2O混合溶剂体系中测定磺酰脲(胺)类除草剂的酸离解常数

杨光富, 刘华银, 杨华铮   

  1. 元素有机化学国家重点实验室, 南开大学元素有机化学研究所, 天津 300071
  • 收稿日期:1998-11-17 出版日期:1999-12-24 发布日期:1999-12-24
  • 通讯作者: 杨华铮
  • 作者简介:杨光富,男,28岁,博士,现在华中师范大学农药化学所工作.
  • 基金资助:

    国家自然科学基金(批准号:29832050)资助课题

Acidity Constants of Herbicidal Sulfonylureas and Sulfonamides from Potentiometric Determinations in Aqueous Dimethyl Sulfoxide

YANG Guang-Fu, LIU Hua-Yin, YANG Hua-Zheng   

  1. National Key Laboratory of Elemento Organic Chemistry, Institute of Elemento Organic Chemistry, Nankai University, Tianjin 300071, China
  • Received:1998-11-17 Online:1999-12-24 Published:1999-12-24

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摘要： 采用电位滴定法在DMSO/H2O(质量比80:20)混合体系中测定了磺酰脲和三唑并嘧啶磺酰胺类除草剂的酸离解常数,进而采用回归分析方法探讨了测得的pKa值与化合物的前沿轨道能级以及取代基效应之间的相关性,结果较为满意,从而证明从该体系测得的pKa值用于构效关系分析是完全可行的.

关键词: 电位滴定, 酸离解常数, 磺酰脲, 三唑并嘧啶磺酰胺, 回归分析

Abstract: The acidity constants of herbicidal sulfonylureas and sulfonamides have been potentiometrically determined at 25 ℃ in DMSO/H2O mixed solvent. The linear relationships between the experimental pKavalues and the energy level of frontier orbital and substituent parameters have been found, which suggested that pKavalues obtained from this mixed solvent were suitable for the structure activity relationships analyses.

Key words: Potentiometer titration, Acidity dissociation constants, Sulfonylureas, Triazolo-pyrimidinyl sulfonamides, Regression analyses

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