| Summary: | Reaction of 1,3-di-t,'rt-bu~.laziridinonc (la) and similar aziridinones with thiosemicarbazide affords, as one of the products, a compound devoid of sulfur, vie., a substituted N- aminoimidazolidinone (3a) by selective cleavage of the acyl-nitrogcn bond. Compound 3a undergoes a novel, acid-catalyzed rearrangement to a 3-imino-hexahydro-1,2,4-tri~in-6-one (7a), which can also be obtained ~' treatment of la with hydrazinc followed by BrCN. involving again selective cleavage of the
acyl-nitrogen bond.
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