Abstract: Kineties of catalytic esterification of alcohol with an adduct of ethyl pima ricate and maleic anhydride have been investigated using anhydrous aluminium chloride as catalyst. Effects of variables such as temperature, concentrations of reactants and catalyst have been studied and a correlation of second-step kinetics has been proposedwhere B stands for ethyl alcohol and A represents the adduct of ethyl pimaricate and moneethyl maleicate. Prior to the investigation of the kinetics, a pure adduct of ethyl pimaricate and maleic anhydride were prepared and its melting point, content of anhydride and gas chromatogram, infrered spectum, mass spectum given.