3,3-Pentamethylenediaziridine reacts with diphenylcyclopropenone in methanol to give two isomeric 1 : 1 adducts. One of these is 1,2-dihydro-4,5-diphenylpyridazine-3-spirocyclohexan-6-one and to the second is tentatively ascribed the structure 2″,3″-diphenylcyclohexanespiro-2′-oxadiazolidine-5′-spirocyclopropene on the basis of its conversion by a novel rearrangement back into an acylated diaziridine structure.
J. W. Lown, J. Chem. Soc. C, 1969, 1338 DOI: 10.1039/J39690001338
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