On May 31, 2016, Amaral, Luisa M. P. F.; Szterner, Piotr; Morais, Victor M. F.; Ribeiro da Silva, Maria D. M. C.; Ribeiro da Silva, Manuel A. V. published an article.Name: 6-Methylpyrimidine-2,4(1H,3H)-dione The title of the article was Experimental and computational thermochemical studies of 6-azauracil derivatives. And the article contained the following:
The standard (p° = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, of 6-azauracil, 6-azathymine and 6-aza-2-thiothymine at T = 298.15 K, were derived from the standard molar energies of combustion, in oxygen, measured by combustion calorimetry. The standard molar enthalpies of sublimation, at T = 298.15 K, were measured by high temperature Calvet microcalorimetry. For 6-azauracil, the standard molar enthalpy of sublimation, at T = 298.15 K, was determined from the temperature-vapor pressure dependence, obtained by the Knudsen mass-loss effusion method.From the exptl. studies, the standard molar enthalpies of formation, in the gaseous phase, at T = 298.15 K, of the 6-azauracil, 6-azathymine and 6-aza-2-thiothymine were derived. The gas-phase enthalpies of formation were also estimated by G3 and G4 calculations which were further extended to the computation of the standard molar enthalpy of formation of 6-aza-2-thiouracil. We compare the values obtained computationally with the exptl. data available and find a good agreement between them. The experimental process involved the reaction of 6-Methylpyrimidine-2,4(1H,3H)-dione(cas: 626-48-2).Name: 6-Methylpyrimidine-2,4(1H,3H)-dione
The Article related to azauracil derivative computational thermochemics, Thermodynamics, Thermochemistry, and Thermal Properties: Thermochemical Properties and other aspects.Name: 6-Methylpyrimidine-2,4(1H,3H)-dione
Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia