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Citation: He Ming-Qian, Fu Xiang-Kai. RESEARCH ON KINETICS AND LFE RELATIONSHIP OF SUPERACID POSA CATALYZED ESTERIFICATION[J]. Acta Physico-Chimica Sinica, ;1990, 6(06): 739-742. doi: 10.3866/PKU.WHXB19900620 shu

RESEARCH ON KINETICS AND LFE RELATIONSHIP OF SUPERACID POSA CATALYZED ESTERIFICATION

1.
Department of Chemistry Southwest-China Teacher's University; Beibei; Chongqing; Sichuan

Received Date: 24 April 1989
Available Online: 15 December 1990

From superacid POSA (perfluorooctanesulfonic acid) catalyzed esterification of p-substituted benzoic acids with ethanol, we t 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 od 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.
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