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.