AbstractSeveral kinds of alcohol have been chosen to react with succinic acid, and several organic acids have been chosen to esterify withn‐butyl alcohol using either Dowex 50 W or sulfuric acid as catalyst. The rate constants are influenced by the temperature, the structure of reactants, and kinds of catalyst; the activation energies are also varied with different reactants and catalysts. The catalytic effect of hydrogen ion is not a simple form, and the possibility of exciting either the acid or the alcohol to its activated state was assured to be affected by their molecular structures. The values of ΔH*, ΔG*, and ΔS* of reactions have been calculated and discu