title: New ruthenium(II) carbonyl complexes bearing disulfide Schiff base ligands and their applications as catalyst for some organic transformations.
abstract: Schiff base disulfide ligands (H2L(1-6)) were synthesized from the condensation of cystamine with salicylaldehyde(H2L(1)), 5-chlorosalicylaldehyde(H2L(2)), o-vanillin(H2L(3)), 2-hydroxyacetophenone(H2L(4)), 3-methyl-2-hydroxyacetophenone(H2L(5)), and 2-hydroxy-1-naphthaldehyde(H2L(6)). H2L(1-6) reacts with the ruthenium precursor complex [RuHCl(CO)(PPh3)3] in benzene giving rise to six new ruthenium(II) complexes of general formula [Ru(CO)L(1-6)]. Characterization of the new complexes was carried out by using elemental and spectral (IR, UV-Vis, NMR ((1)H and (13)C) and Mass) techniques. An octahedral geometry was assigned for all the complexes based on the spectral data obtained. The catalytic efficiency of the new complexes in aldehyde to amide conversion in the presence of NaHCO3, N-alkylation of aniline in the presence of t-BuOK, and transfer hydrogenation of ketones in the presence of iPrOH/KOH reactions were studied. Furthermore, the effect of solvents and catalyst/substrate ratio on the catalytic aldehyde to amide conversion were also discussed.
authors.affiliation: Department of Chemistry, Periyar University, Salem 636 011, India.
authors.forename: Govindan
authors.initials: G
authors.lastname: Prakash
authors.affiliation: Department of Chemistry, Periyar University, Salem 636 011, India. Electronic address: viswanathamurthi72@gmail.com.
authors.forename: Periasamy
authors.initials: P
authors.lastname: Viswanathamurthi
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D000478:Alkylation; D000577:Amides / Q000737:chemistry; D000588:Amines / Q000737:chemistry; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D004220:Disulfides / Q000138:chemical synthesis / Q000737:chemistry*; D006865:Hydrogenation; D008024:Ligands; D012428:Ruthenium / Q000737:chemistry*; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D000577:Amides; D000588:Amines; D056831:Coordination Complexes; D004220:Disulfides; D008024:Ligands; D012545:Schiff Bases; D012428:Ruthenium
keywords: Aldehyde to amide conversion; Disulfide Schiff base ligands; N-alkylation; Ruthenium(II) complexes; Spectral studies; Transfer hydrogenation