Alkaline hydrolysis of N-spiropentyl-N-nitrosourea at -50 °C generates unknown diazospiropentane in situ, which is trapped with methyl methacrylate or 3,3-dimethylcyclopropene yielding the corresponding 1-pyrazolines with a spiropentane fragment in the molecule. Some chemical transformations of the products obtained are performed.
Y. V. Tomilov, E. V. Shulishov, G. P. Okonnishnikova and O. M. Nefedov, Mendeleev Commun., 1997, 7, 200 DOI: 10.1070/MC1997v007n05ABEH000828
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