Enthalpies of combustion and formation of α-d-glucoheptono-1,4-lactone and α,β-glucooctanoic-1,4-lactone

Standard molar enthalpies of formation in the crystalline phase of 7-hydroxy-4-methylcoumarin, 7-ethoxy-4-methylcoumarin, and 6-methoxy-4-methylcoumarin

“…The experimental results obtained by DSC and the values of the other properties needed to calculate the combustion energies are shown in table 1. The densities were obtained by pycnometry, as described in a previous work [18]. The energies of combustion were obtained using an isoperibol calorimeter with a Parr 1107 static semi-micro bomb.…”

“…This was due to high purity of the oxygen and to the extensive flushing of the bomb before the filling. Detailed descriptions of the combustion experiments and the equipment are given in references [18,21,22].…”