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The regularities of AlkNHBr consumption in the reaction of formation of 1,2-dialkyldiaziridines in aqueous media were studied for the first time by UV spectrometry. The rate constants of particular steps of the reaction were estimated starting from the possibility of formation of the precursor of 1,2-dialkyldiaziridine, N-halogenaminal, due to the amination of the intermediate iminium cation along with the parallel halogenation of the intermediate gem-diamine. The quantum chemical calculations (DFT, B3LYP, 6–31++G(d,p) and 3–21G basis sets) were performed for the spatial and electronic structures of the compounds and indices of the local reactivity and global electrophilicity of the key intermediates of the reactions. The results of the calculations allowed us to explain the retardation of the reaction when using EtNHBr instead of MeNHBr.

The reactions of 1,3,5-trialkylhexahydro-1,3,5-triazines with N-chloroalkylamines resulted in 1,2-dialkyldiaziridines, whereas the reactions of N-chloroalkylamines or N,N-dichloroalkylamines with an excess of primary aliphatic amines gave 1,2,3-trialkyldiaziridines.