ON TRIAZOLS XI. STRUCTURE ELUCIDATION OF ISOMERIC 1,2,4-TRIAZOL0PYRIMIDINONES

Article abstract of DOI:10.1016/S0040-4020(01)81656-2

The structure of isomeric 3-6 type triazolo-pyrimidinones and their N-methylated and N-benzylated derivatives was elucidated.In spite of the good agreement between the carbonyl bands of derivatives 3-6 (R1=CH3, R=H, Q=SCH3) and their structure the IR method did not prove to be characteristic in general for the above structures.In contrast to the results reported previously it was found that the 3-6 type derivatives are well characterised by their UV spectra taken in neutral solution.The 13C-NMR spectra gave an unequivocal proof of the above structures corroborating the conclusions drawn from the UV measurements.