title: Reversible Redox Chemistry and Catalytic C(sp(3))-H Amination Reactivity of a Paramagnetic Pd Complex Bearing a Redox-Active o-Aminophenol-Derived NNO Pincer Ligand.
abstract: The synthesis, spectroelectrochemical characterization (ultraviolet-visible and nuclear magnetic resonance), solid state structures, and computational metric parameters of three isostructural PdCl(NNO) complexes 1 [PdCl(NNO(ISQ))], 2 {[PdCl(NNO(AP))](-)}, and 5 {[PdCl(NNO(IBQ))](+)} (NNO = o-aminophenol-derived redox-active ligand with a pendant pyridine) with different NNO oxidation states are described. The reduced diamagnetic complex 2 readily reacts with halogenated solvents, including lattice solvent from crystalline pure material, as supported by spectroscopic data and density functional theory calculations. Thorough removal of chlorinated impurities allows for modest catalytic turnover in the conversion of 4-phenylbutyl azide into N-protected 2-phenylpyrrolidine, which is the first example of a palladium-catalyzed radical-type transformation facilitated by a redox-active ligand as well as the first C-H amination mediated by ligand-to-substrate single-electron transfer.
authors.affiliation: Homogeneous, Supramolecular & Bio-inspired Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Daniël L J
authors.initials: DL
authors.lastname: Broere
authors.affiliation: Homogeneous, Supramolecular & Bio-inspired Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Nicolaas P
authors.initials: NP
authors.lastname: van Leest
authors.affiliation: Homogeneous, Supramolecular & Bio-inspired Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Bas
authors.initials: B
authors.lastname: de Bruin
authors.affiliation: Department of Chemistry, John Hopkins University , Baltimore, Maryland 21218, United States.
authors.forename: Maxime A
authors.initials: MA
authors.lastname: Siegler
authors.affiliation: Homogeneous, Supramolecular & Bio-inspired Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Jarl Ivar
authors.initials: JI
authors.lastname: van der Vlugt