title: Reaction of (bisimido)niobium(V) complexes with organic azides: [3 + 2] cycloaddition and reversible cleavage of β-diketiminato ligands involving nitrene transfer.
abstract: We describe the unusual reactivity of a highly labile diethyl ether adduct of an asymmetric niobium(V) bis(imide) 2.OEt2 containing the monoazabutadiene (MAD) ligand. This species undergoes clean nitrene transfer on treatment with tert-butyl- or di-isopropylphenyl azide resulting in the unprecedented reformation of nacnac ligands bound to the metal center. Corresponding reactions with trimethylsilyl- or tert-butyl azide allowed the isolation of two rare intermediates prior to N2 loss; mechanistic studies support the involvement of two different niobium species.
authors: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors: Andreas H
authors: AH
authors: Obenhuber
authors: Thomas L
authors: TL
authors: Gianetti
authors: Xavier
authors: X
authors: Berrebi
authors: Robert G
authors: RG
authors: Bergman
authors: John
authors: J
authors: Arnold