Enthalpies of combustion and formation of ethyl propionate and diethyl carbonate

Abstract

Enthalpies of combustion and vaporization at 298.15 K have been measured for ethyl propionate and diethyl carbonate. Enthalpies of formation at 298.15 K have been derived for the compounds in the liquid and gaseous states. The results are: ΔH f o(l)/kJ mol −1 ΔH f o(g)/kJ mol −1 Ethyl propionate −502.7 ± 0.7 −463.6 ± 0.7 Diethyl carbonate −681.5 ± 0.8 −637.9 ± 0.8 The sum of the Allen bond-energy scheme parameters ( Γ oc do d + Δ coo d ) for esters has been calculated. The stabilization energy calculated for ethyl propionate is 80 kJ mol −1 and for diethyl carbonate 129 kJ mol −1.