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  2. All Volumes and Issues
  3. Volume 14, Number 3, 2020
  4. Thermodynamic Properties of 6-Methyl-2-oxo-4-aryl-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid Esters

Thermodynamic Properties of 6-Methyl-2-oxo-4-aryl-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid Esters

JCCT.
2020;
Volume 14, Number 3
: pp. 227 - 283
https://doi.org/10.23939/chcht14.03.277
Authors:
  1. Olena Klachko
  2. Vasyl Matiychuk
  3. Iryna Sobechko
  4. Valentyn Serheyev
  5. Nadiya Tishchenko
1
Lviv Polytechnic National University
2
Ivan Franko National University of Lviv
3
Lviv Polytechnic National University
4
Lviv Polytechnic National University
5
Frantsevich Institute for Problems of Materials Science

Combustion energies of esters (ethyl 6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carboxylate; ethyl 6-methyl-4-(4-methylphenyl)-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate; ethyl 4-(4-methoxyphenyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate and ethyl 4-(6-methoxyphenyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate) were experimentally obtained using a bomb calorimetry. According to the experimental data, the enthalpies of combustion and the enthalpies of formation in a solid state were calculated. Derivative analysis was used to investigate the compounds within the temperature range of 483.0–577.5 K. The enthalpies of fusion, vaporization and sublimation were calculated using the results of the differential thermal analysis. According to the obtained data, the enthalpies of formation of the investigated compounds in the gaseous state were calculated. The possibility of using the Benson additive scheme to calculate the enthalpy of formation is demonstrated.

enthalpy of combustion
enthalpy of formation
enthalpy of fusion
enthalpy of vaporization
enthalpy of sublimation
6-methyl-2-oxo-4-aryl-1,2,3,4- tetrahydropyrimidine-5-carboxylic acid esters
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