2 research outputs found

    Diastereospecific and diastereoselective syntheses of ruthenium(II) complexes using N,N‘ bidentate ligands aryl-pyridin-2-ylmethyl-amine ArNH-CH2-2-C5H4N and their oxidation to imine ligands

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    11 pages, 9 figures, 2 tables, 5 schemes, 2 chart.-- Supporting Information Available: http://pubs.acs.org.Coordination of N,N‘ bidentate ligands aryl-pyridin-2-ylmethyl-amine ArNH-CH2-2-C5H4N 1 (Ar = 4-CH3-C6H4, 1a; 4-CH3O-C6H4, 1b; 2,6-(CH3)2-C6H3, 1c; 4-CF3-C6H4, 1d) to the moieties [Ru(bipy)2]2+, [Ru(η5-C5H5)L]+ (L = CH3CN, CO), or [Ru(η6-arene)Cl]2+ (arene = benzene, p-cymene) occurs under diastereoselective or diastereospecific conditions. Detailed stereochemical analysis of the new complexes is included. The coordination of these secondary amine ligands activates their oxidation to imines by molecular oxygen in a base-catalyzed reaction and hydrogen peroxide was detected as byproduct. The amine-to-imine oxidation was also observed under the experimental conditions of cyclic voltammetry measurements. Deprotonation of the coordinated amine ligands afforded isolatable amido complexes only for the ligand (1-methyl-1-pyridin-2-yl-ethyl)-p-tolyl-amine, 1e, which doesn't contain hydrogen atoms in a β position relative to the N−H bond. The structures of [Ru(2,2‘-bipyridine)2(1b)](PF6)2, 2b; [Ru(2,2‘-bipyridine)2(1c)](PF6)2, 2c; trans-[RuCl2(COD)(1a)], 3; and [RuCl2(η6-C6H6)(1a)]PF6, 4a, have been confirmed by X-ray diffraction studies.The authors gratefully acknowledge the European Commission (LIFE05 ENV/E/000333), the Spanish Ministerio de Educación y Ciencia (BQ2002-01039 and CTQ2005-03141), and the Junta de Castilla y León (BU14/03) for financial support.Peer reviewe

    Diastereospecific and diastereoselective syntheses of ruthenium(II) complexes using N,N‘ bidentate ligands aryl-pyridin-2-ylmethyl-amine ArNH-CH2-2-C5H4N and their oxidation to imine ligands

    No full text
    11 pages, 9 figures, 2 tables, 5 schemes, 2 chart.-- Supporting Information Available: http://pubs.acs.org.Coordination of N,N‘ bidentate ligands aryl-pyridin-2-ylmethyl-amine ArNH-CH2-2-C5H4N 1 (Ar = 4-CH3-C6H4, 1a; 4-CH3O-C6H4, 1b; 2,6-(CH3)2-C6H3, 1c; 4-CF3-C6H4, 1d) to the moieties [Ru(bipy)2]2+, [Ru(η5-C5H5)L]+ (L = CH3CN, CO), or [Ru(η6-arene)Cl]2+ (arene = benzene, p-cymene) occurs under diastereoselective or diastereospecific conditions. Detailed stereochemical analysis of the new complexes is included. The coordination of these secondary amine ligands activates their oxidation to imines by molecular oxygen in a base-catalyzed reaction and hydrogen peroxide was detected as byproduct. The amine-to-imine oxidation was also observed under the experimental conditions of cyclic voltammetry measurements. Deprotonation of the coordinated amine ligands afforded isolatable amido complexes only for the ligand (1-methyl-1-pyridin-2-yl-ethyl)-p-tolyl-amine, 1e, which doesn't contain hydrogen atoms in a β position relative to the N−H bond. The structures of [Ru(2,2‘-bipyridine)2(1b)](PF6)2, 2b; [Ru(2,2‘-bipyridine)2(1c)](PF6)2, 2c; trans-[RuCl2(COD)(1a)], 3; and [RuCl2(η6-C6H6)(1a)]PF6, 4a, have been confirmed by X-ray diffraction studies.The authors gratefully acknowledge the European Commission (LIFE05 ENV/E/000333), the Spanish Ministerio de Educación y Ciencia (BQ2002-01039 and CTQ2005-03141), and the Junta de Castilla y León (BU14/03) for financial support.Peer reviewe
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