Abstract Oxidation of N-aminophthalimide with lead tetraacetate in the presence of spiro (1- pyrazolinecyclopropanes) at temperature from− 20° C to− 30° C resulted in the formal generation of phthalimidonitrene followed by its addition at the N= N bond of the pyrazoline ring to form 5 (3)-substituted N-{spiro [1-pyrazolinio-3 (5), 1′-cyclopropane]}-N- phthalimidoamides (azimines), whose regioisomeric compositions were determined to a ...
![6-phenyl-4,5-diazaspiro[2.4]hept-4-ene Structure](https://image.chemsrc.com/caspic/007/252921-91-8.png)