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The Niobaziridine−Hydride Functional Group:  Synthesis and Divergent Reactivity

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journal contribution
posted on 14.03.2003, 00:00 authored by Joshua S. Figueroa, Christopher C. Cummins
A multistep synthetic strategy enables the isolation of the niobaziridine−hydride complex Nb(H)(η2-tBu(H)CNAr)(N[Np]Ar)2 (1, Np = neopentyl, Ar = 3,5-C6H3Me2), which functions as a reactive synthon for its tautomer, the three-coordinate, trisamide species Nb(N[Np]Ar)3 (2). Treatment of 1 with various small molecules has demonstrated its capacity to effect two-electron reduction chemistry. Most noteworthy is the reaction between 1 and elemental phosphorus (P4), providing in high yield the bridging diphosphide complex (μ222-P2)[Nb(N[Np]Ar)3]2. However, unsaturated organic functionality including nitriles and aldehydes can insert into the Nb−H bond of 1, leaving the niobaziridine ring intact, thus demonstrating that dual pathways of reactivity are available to the niobaziridine−hydride functional group.