From an Isocyanide via Insertion and Rearrangement

A zirconaaziridine can also result from the thermal rearrangement of an imi-noacyl hydride complex, formed by isocyanide insertion into one Zr-H bond of a dihydride. Bercaw and coworkers observed (Eq. 8) that ArNC insertion into a Zr-H bond of Cp5ZrH2, followed by hydride transfer to the iminoacyl ligand of 9, formed the zirconaaziridine 10, although 10 rearranged upon further thermolysis [35]. 

Though not general (rearrangement is not observed for R=f-Bu, perhaps because its steric bulk prohibits coordination of the nitrogen), this method allows the synthesis of the spirocyclic zirconaaziridine 12 [36,37]. 

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