NMR SPECTRA OF CYCLIC NITRONES. 5 . 13C NMR SPECTRA OF THE POTENTIAL TAUTOMERIC SYSTEMS OF AMINO-, HYDROXY-, AND MERCAPTONITRONES IN THE SERIES OF 3-IMIDAZOLINE 3-OXIDE

Article abstract of DOI:10.1007/BF00497211

The position of the tautomeric equilibrium in amino-, hydroxy-, and mercaptonitrones was determined by the 13C NMR method for the case of the derivatives of 3-imidazoline-3-oxide.It was shown that the tautomeric equilibrium in the OH and SH derivatives is shifted toward the oxo and thioxo forms (ca. 95percent).The chemical shifts of the carbon atoms of the nitrone group in the α-N-, α-O-, and α-S-substituted nitrones lie in the region of 137 - 150 ppm.