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本文以Hammett方程为基础,将羧酸在硫酸盐水合物催化下的乙酯化反应的相对自由能分解为两项,一项是取代基极性效应贡献项,另一项是催化剂对反应相对自由能的贡献项(y_m).该催化线性自由能方程可表示为:log[K_(R(M))/K_(R(mn))]=σ~*ρ~M+Y_m.若已知ρ~M和Y_m,可以计算各种取代羧酸的乙酯化反应速度常数K_(R(M)).
Based on the Hammett equation, the relative free energy of the esterification of carboxylic acids under the sulfate hydrate catalysis is decomposed into two parts, one is the contribution of the substituent polar effect, the other is the relative reaction of the catalyst to the reaction Free energy contribution term (y_m). The catalytic linear free energy equation can be expressed as: log [K_ (R (M)) / K_ (R (mn))] = σ ~ * ρ ~ M + Y_m. ρ ~ M and Y_m, can be calculated for various substituted carboxylic acid esterification reaction rate constant K_ (R (M)).