In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Kinetics of drug decomposition. Part 38. Hydrolysis and autoxidation of sodium phenylbutazone and aminophenazone in binary kinetic system, published in 1976, which mentions a compound: 129-18-0, Name is Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-ide, Molecular C19H19N2NaO2, Reference of Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-ide.
The kinetics of hydrolysis and autoxidation of Na phenylbutazone (Na I)(II) [129-18-0] and aminophenazone (III) [58-15-1] in binary sysytems (e.g., Rheumopyrin [8066-94-2] and Irgapyrin [8064-79-7]) was investigated in NH3-AcOH, Carmody and Wefford buffers at different buffer concentration, pH, ionic strengths, and temperature The degradation of II in the presence of III followed 1st order reaction kinetics. III degradation at low concentration (in buffers-Ph 7.13-10.0) was possible only under high excess O. High concentrations of II and III (15%) can be considered as a system stabilizing the degradation, which was regulated by the alk. character of II (pH = 8.6 to 15% II). The lack of effect of different kinds of buffers, ionic strength, and pH on the rate constant of II hydrolysis, qualified the process as a spontaneous reaction initiated by the attack of water mols. The degradation parameters of II in the presence of III, compared with those in its absence, confirm the stabilizing effect of III. In the autoxidation and hydrolysis reaction of II, the changes in the reaction rate depended on the pH. At pH 7.13, the degradation was 3 times faster than at pH 12.07. The activation energy values for the hydrolysis of II without III were lower by 19240 J/mole and for the autoxidation and hydrolysis by 2700 J/mole than those for III present in the reaction medium.
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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem