Saturated vapor pressures and enthalpies of vaporization of malic acid esters

The saturated vapor pressures of malic acid diesters and linear С1-С5 alcohols are determined using the transpiration method in the temperature range of 303–369 K. The enthalpies of vaporization of esters at 298.2 K are determined on the basis of the obtained data. Correlations of the enthalpies of vaporization from Kovats indices and number of carbon atoms are obtained. The contributions of the hydroxyl group and intermolecular hydrogen bonds to are estimated. The author’s QSPR method for calculating the values of the enthalpies of vaporization of esters of hydroxy acids is modified.