13C NMR SPECTRA OF CYCLIC NITRONES. 1. 2-SUBSTITUTED 4-METHYL- AND 4-PHENYL-1-HYDROXY-5,5-DIMETHYL-3-IMIDAZOLINE 3-OXIDES

Article abstract of DOI:10.1007/BF00504211

The introduction of an N-oxide oxygen atom into azomethines leads to an upfield shift of the signals for the carbon atom of the C=N group in the 13C NMR spectra by 30-33 ppm.This is consistent with the increase in the electron density on this atom.The signal of the nitrone carbon atom is observed in the region of 140-147 ppm, depending on the nature of the substituent at the C(2) atom of the 3-imidazoline 3-oxide ring.