Abstract
The thermoanalytical study of barbital (a) and allobarbital (b) has enabled the existence of polymorphs for (b) to be shown and to confirm those of (a). The thermal stability sublimation kinetics of commercial forms of (a) and (b) have been determined; their temperatures and intervals of fusion are given. Knowing the thermal behaviour of these drugs, their degree of purity (99.52±0.12, a; 99.77 ± 0.07, b), their enthalpy of fusion (32.31 ± 0.24, a; 24.98 ± 0.58, b) kJ mol −1 and entropy have been evaluated by differential scanning calorimetry.
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