enthalpy of dissolution; enthalpy of mixing; enthalpy of fusion; entropy of dissolution; entropy of mixing; entropy of fusion; 6-methyl-2-oxo-4-aryl-1

The derivatives of 6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid are the simplest representatives of Bidzhenelli’s dyhidropirymidynes and are characterized by a wide range of biological activity. It is important to use pure substances at each stage of the synthesis in the pharmaceutical industry. The main method of solid substances purifying is recrystallization using the so-called "classic" solvents, which include acetonitrile.