Multi-membered N-heterocycles R 0690Aminomethylation by Formaldehyde and Primary Amines of Anionic σ-Adduct Obtained from 2,4-Dinitrophenol and Acetophenone Carbanion. -Mechanistical aspects are discussed. The structure of compound (VIc) is determined by X-ray analysis. -(SHAKHKEL'DYAN, I. V.; LEONOVA, O. V.; ATROSHCHENKO, Y. M.; BOIKOVA, O. I.; BOBRULEVICH, O. Y.; GRINTSELEV-KNYAZEV, G. V.; YAKUNINA, I. E.; SHCHUKIN, A. N.; ALIFANOVA, E. N.; SUBBOTIN, V. A.; Russ.