G. M. Kheifets, N. V. Khromov-Borisov, A. I. Koltsov
1967
Citations
0
Influential Citations
8
Citations
Journal
Tetrahedron
Abstract
Abstract PMR spectra of 4,6-dihydroxypirimidine and its 2- and 5-substituted derivatives have been compared with the spectra of their O- and N-methyl derivatives of fixed structures, corresponding to possible tautomeric forms. It was found that in dimethyl sulphoxide medium the compounds exist predominantly in the oxo-hydroxy form. In aqueous solutions of 4,6-dihydroxypyrimidine and its N-methyl derivatives the bipolar-ionic form with delocalized charges probably predominates.