Structures and Chemical Equilibria of Some N-Heterocycles Containing Amide Linkages

Abstract

Structures and chemical equilibria of 5-carboxy-2-thiouracil (1), 5,6-diphenyl-3-hydroxy-1,2,4-triazine (2), 1-phenyl-3-methyl-5-pyrazolone (3) and 2-mercapto-4,6-dimethylpyrimidine hydrochloride (4) are reported. Their electronic transitions are assigned and pK values are evaluated and discussed.

Keywords

• Chemical equilibria
• 5-carboxy-2-thiouracil
• synthesis
• electronic transitions and pK values