[t-BuNHCH2CH2CONH-]2 o 10 7N 7AMNHNHI2 \ f-Bu 9 ,0 i. BuN HCH2 CH2 CO2 H Because I-t-butyl-2-aziridinecarboxylic acid hydrszide (9) was so unstable, other aalrtdine hydrazLdes were Eought In the hope that they might be isulable and thus more amenable to study. The reactions of methyl 1-benzyl- and l-phenyl-2-aziridinecarboxylates ( e and 7 wiLh hydrazine hydrate give spectrally pure crystalline compounds identified as 1-benzyl- and i-phenyl-2-aziridinecarbo ylic acid hydrazides (. and 14) respectively. These solids themselves were not very sacble buc could be kept under nitrogen in the refrigerator ior extended periods of time. When dissolved in acetone they formed the corresponding acetone hydra- roees (I5 and 16). The hydrazones are stable crystalllle compounds for which satisfactory elem enal analyses were obtained.