title: Reductive deprotonation and dehydrogenation of phenylhydrazine at a nickel center to give a nickel diazenido complex.
abstract: The reaction of [L(tBu)Ni(OEt(2))] (where L(tBu) = [HC(C(t)BuNC(6)H(3)((i)Pr)(2))(2)](-)) with phenylhydrazine leads to the phenylhydrazido(1-) complex [L(tBu)Ni(η(2)-NPhNH(2))] (1) with concomitant formation of H(2). Treatment of 1 with potassium graphite in the presence of crown ether again leads to H(2) evolution and affords the heterobimetallic complex [L(tBu)Ni(μ-η(2):η(2)-NPhNH)]K(18-crown-6) containing the doubly deprotonated phenylhydrazido(2-) ligand. 1 can be converted into a phenyldiazenido complex [L(tBu)Ni(η(1)-NNPh)] in the course of a dehydrogenation reaction employing 1,2-diisopropylazo dicarboxylate (DIAD) as the oxidant.
authors.affiliation: Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Köthe
authors.forename: Ramona
authors.initials: R
authors.lastname: Metzinger
authors.forename: Christian
authors.initials: C
authors.lastname: Herwig
authors.forename: Christian
authors.initials: C
authors.lastname: Limberg
mesh_terms: D006865:Hydrogenation; D008958:Models, Molecular; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010084:Oxidation-Reduction; D010659:Phenylhydrazines / Q000737:chemistry*; D011522:Protons
chemical_list: D009942:Organometallic Compounds; D010659:Phenylhydrazines; D011522:Protons; C030299:phenylhydrazine; D009532:Nickel