Manifestation of aza-effect in 13C NMR spectra of acetyldiazines

Carbon magnetic resonance spectra are reported for isomeric acetyldiazines, and an analysis is made of the changes in chemical shifts of the acetyl-group and ring carbon atoms due to the aza-effect in the isomers. In the α-acetylazine series, special features of spectral properties have been revealed for 2-acetylpyrimidines.