title: An unusally diverse array of products formed upon carbonylation of a dialkylniobium complex.
abstract: The reaction of carbon monoxide with a beta-diketiminato dimethyl niobium complex (BDI)Me2Nb(NtBu) is shown to lead to a variety of products whose distribution displays a remarkable dependence on the reaction conditions. Among these, the products of metal reduction, enediolate formation, and intramolecular C-H activation have been fully characterized. An investigation into the individual steps leading to these products points to a transient initial monoacyl complex, whose fate may be perturbed via reaction conditions to allow for control over the product distribution. Furthermore, the reaction of (BDI)Me2Nb(NCMe3) with XylNC (Xyl = 2,6-Me2C6H3) yields the eta2-ketimine complex (BDI)(Me2C=NXyl)Nb(NCMe3), whose characterization and reactivity enhance our understanding of the sequences involving CO.
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors.forename: Neil C
authors.initials: NC
authors.lastname: Tomson
authors.forename: Andrew
authors.initials: A
authors.lastname: Yan
authors.forename: John
authors.initials: J
authors.lastname: Arnold
authors.forename: Robert G
authors.initials: RG
authors.lastname: Bergman
mesh_terms: D000215:Acylation; D000473:Alkanes / Q000737:chemistry*; D000478:Alkylation; D002244:Carbon / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D007097:Imines / Q000737:chemistry; D007659:Ketones / Q000737:chemistry*; D008956:Models, Chemical; D009556:Niobium / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis*
chemical_list: D000473:Alkanes; D007097:Imines; D007659:Ketones; D009942:Organometallic Compounds; D009556:Niobium; D002244:Carbon; D002248:Carbon Monoxide; D006859:Hydrogen