Abstract
Abstract The rate constants, the activation energies and the entropies of activation of the addition reactions of n-butyl vinyl ether with carboxylic acids in dioxane, anisole and toluene were determined. It was found that the reaction is first order with respect to vinyl ether and second order with respect to carboxylic acid, and the rate of the reaction increases as the acidity of carboxylic acid increases and a linear Ham-mett relation is observed in the reaction of meta and para substituted benzoic acids. In the presence of a catalytic amount of phosphoric acid, the rate increases linearly with its concentration. The addition involves two stages, namely the initial formation of intermediate complex from vinyl ether and carboxylic acid, followed by the reaction of the complex with another carboxylic acid. In addition, the solvent effect has been clarified and a general acid catalyzed reaction has been discussed in view of these results.
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