物理化学学报 >> 1990, Vol. 6 >> Issue (06): 739-742.doi: 10.3866/PKU.WHXB19900620

研究简报 上一篇    下一篇

超酸POSA催化酯化反应动力学及线性自由能关系

贺明谦; 傅相锴   

  1. 西南师范大学化学系, 四川重庆
  • 收稿日期:1989-04-24 修回日期:1990-05-15 发布日期:1990-12-15
  • 通讯作者: 傅相锴

RESEARCH ON KINETICS AND LFE RELATIONSHIP OF SUPERACID POSA CATALYZED ESTERIFICATION

He Ming-Qian; Fu Xiang-Kai   

  1. Department of Chemistry Southwest-China Teacher's University; Beibei; Chongqing; Sichuan
  • Received:1989-04-24 Revised:1990-05-15 Published:1990-12-15
  • Contact: Fu Xiang-Kai

Abstract: From superacid POSA (perfluorooctanesulfonic acid) catalyzed esterification of p-substituted benzoic acids with ethanol, we got not only the rate canstants k, the energy of activation ΔE, the entropy of activation ΔS~≠, and the enthalpy of acti-vation ΔH~≠; but also a good Hammett linear Free energy relationship (LFE Rela-tionship). This is the first report of applying LFE relationship to superacid catalysis. Finally, the reaction intermediate, the reaction constant ρ, and the mechanism of the reaction were also discussed. It is deduced by this paper that the mechanism of POSA catalyzed esterification is basically identical with those of normal strong acids catalysis, and the reaction is a process of general acid catalysis.