@article {1481, title = {Catalyst poisoning in catalyzed imine hydrogenation: A novel zwitterionic Rh(I)/o-hydroxy-substituted imine complex}, journal = {Journal of Molecular Catalysis a-Chemical}, volume = {257}, number = {1-2}, year = {2006}, note = {ISI Document Delivery No.: 089DITimes Cited: 3Cited Reference Count: 38Marcazzan, Paolo Patrick, Brian O. James, Brian R.}, month = {Sep}, pages = {26-30}, type = {Article}, abstract = {During investigation of the homogeneous H-2-hydrogenation of the ketimine (o-HOC6H4)C(Me)=NCH2Ph catalyzed by the [Rh(COD)(PPh3)(2)]PF6 precursor in MeOH at ambient conditions, we have isolated [Rh{eta(4)-(C6H4O)C(-)(Me)=N(+)(H)CHPh}(PPh3)(2)]PF6 (3), an unusual zwitterionic Rh complex in which the imine is coordinated via the C-4 part of the o-hydroxy-arene moiety in a quinoid form; this tautomer is generated via proton transfer from the O-atom to the N-atom within the molecular, benzenoid form. Precipitation of 3 from the MeOH solution, even under H-2, causes sequestration of the Rh and complete suppression of the catalytic activity. (In a previously studied system with the corresponding, non-hydroxy-substituted ketimine, PhC(Me) = NCH2Ph, the Rh was sequestered as an inactive o-metalated species). The solid state structure of 3 is retained in CH2Cl2 solution, but in MeOH and Me2CO reversible loss of the ketimine generates the cis-[Rh(PPh3)(2)(solvent)(2)]PF6 species. (c) 2006 Elsevier B.V. All rights reserved.}, keywords = {amine, BEHAVIOR, CATALYSIS, CATIONIC RHODIUM COMPLEXES, CHEMICALS, FINE, HYDROGENATION, HYDROLYSIS, imine complex, LIGAND, LIGANDS, OLEFINS, phosphine, RHODIUM COMPLEX, SCHIFF-BASES, SELECTIVE HYDROGENATION, zwitterion}, isbn = {1381-1169}, url = {://000240860100005}, author = {Marcazzan, P. and Patrick, B. O. and James, Brian R.} } @article {938, title = {Imine hydrolysis and role of a rhodium(I)-imine-amine complex in homogeneous H-2-hydrogenation of the imine and a rare example of inequivalent NH2 protons}, journal = {Inorganic Chemistry}, volume = {43}, number = {16}, year = {2004}, note = {ISI Document Delivery No.: 844VXTimes Cited: 16Cited Reference Count: 19}, month = {Aug}, pages = {4820-4824}, type = {Article}, abstract = {{A Rh-catalyzed, homogeneous hydrogenation of the imine}, keywords = {amine, ASYMMETRIC HYDROGENATION, CATALYST, CATIONIC COMPLEXES, PHOSPHINE COMPLEXES, rhodium}, isbn = {0020-1669}, url = {://000223190300016}, author = {Marcazzan, P. and Abu-Gnim, C. and Seneviratne, K. N. and James, Brian R.} } @article {408, title = {Bisphosphine ligands containing two o-N,N-dimethylanilinyl substituents at each phosphorus atom}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {80}, number = {11}, year = {2002}, note = {ISI Document Delivery No.: 623LDTimes Cited: 11Cited Reference Count: 35}, month = {Nov}, pages = {1600-1606}, type = {Article}, abstract = {The synthesis and complete characterization of the family of tetra(amine)bisphosphine ligands (o-NMe2C6H4)(2)P-(X)-P(o-NMe2C6H4)(2), where X = CH2 (dmapm), (CH2)(2) (dmape), and CH(CH2)(3)CH (dmapcp), are described. Crystal structure data are compared with known, analogous bisphosphines containing o-pyridyl or phenyl substituents in place of the o-dimethylanilinyl groups. Several short, intramolecular C-H...N distances in the anilinyl derivatives may represent the presence of weak hydrogen bonds.}, keywords = {ACID, amine, AMPHIPHILIC DIPHOSPHINES, CATALYTIC-HYDROGENATION, CHEMISTRY, DERIVATIVES, HYDROFORMYLATION, hydrogen-bonding to N atoms, phosphine, polydentate, RESOLUTION, RHODIUM COMPLEXES, RUTHENIUM(II), WATER-SOLUBLE PHOSPHINES}, isbn = {0008-4042}, url = {://000179703800030}, author = {Jones, N. D. and Meessen, P. and Smith, M. B. and Losehand, U. and Rettig, S. J. and Patrick, B. O. and James, Brian R.} } @article {3756, title = {Characterization of five-coordinate ruthenium(II) phosphine complexes by X-ray diffraction and solid-state P-31 CP/MAS NMR studies and their reactivity with sulfoxides and thioethers}, journal = {Inorganic Chemistry}, volume = {35}, number = {25}, year = {1996}, note = {ISI Document Delivery No.: VW819Times Cited: 27Cited Reference Count: 41}, month = {Dec}, pages = {7304-7310}, type = {Article}, abstract = {{P-31 CP/MAS NMR spectroscopy is examined as a method of characterization for ruthenium(II) phosphine complexes in the solid state, and the results are compared with X-ray crystallographic data determined for RuCl2(dppb)(PPh(3)) (dppb = Ph(2)P(CH2)(4)PPh(2)), RuBr2(PPh(3))(3), and the previously determined RuCl2(PPh(3))(3). Crystals of RuBr2(PPh(3))(3) (C54H45Br2P3Ru) are monoclinic, space group P2(1)/a, with a = 12.482(4) Angstrom}, keywords = {amine, ANGLE SPINNING TECHNIQUES, CATALYSTS, DERIVATIVES, IMINE, LIGANDS, NUCLEAR MAGNETIC-RESONANCE, PLATINUM(II), triphenylphosphine}, isbn = {0020-1669}, url = {://A1996VW81900019}, author = {Macfarlane, K. S. and Joshi, A. M. and Rettig, S. J. and James, Brian R.} }