The Experts below are selected from a list of 843 Experts worldwide ranked by ideXlab platform

Kenneth N. Marsh - One of the best experts on this subject based on the ideXlab platform.

Jan Linek - One of the best experts on this subject based on the ideXlab platform.

Ying-yan Jiang - One of the best experts on this subject based on the ideXlab platform.

  • catalytic behaviors of silica supported methylcellulose l phenyl alanine platinum complexes in asymmetric hydrogenation of Diacetone Alcohol
    Polymers for Advanced Technologies, 2002
    Co-Authors: Kai Huang, Mei-yu Huang, Lei Xue, Ying-yan Jiang
    Abstract:

    A new chiral natural bio-polymer–metal complexe, silica-supported methylcellulose-L-phenyl alanine–platinum complex (SiO2-MC-L-Phe–Pt) has been prepared by a very simple method, and the Pt complex has been found to be able to catalyze the asymmetric hydrogenation of Diacetone Alcohol to give (R)-(−)-2-methyl-2,4-pentandiol at room temperature and under atmospheric hydrogen pressure. The product and optical yields of 2-methyl-2,4-pentandiol amounted to 67.0 and 92.7%, respectively. The product and optical yields were remarkably affected by the Pt content in the complex, the kind of solvent and the reaction temperature. This catalyst was very stable and could be reused several times without any remarkable change in optical catalytic activity. Copyright © 2002 John Wiley & Sons, Ltd.

  • Catalytic behaviors of silica‐supported methylcellulose‐L‐phenyl alanine–platinum complexes in asymmetric hydrogenation of Diacetone Alcohol
    Polymers for Advanced Technologies, 2002
    Co-Authors: Kai Huang, Mei-yu Huang, Lei Xue, Ying-yan Jiang
    Abstract:

    A new chiral natural bio-polymer–metal complexe, silica-supported methylcellulose-L-phenyl alanine–platinum complex (SiO2-MC-L-Phe–Pt) has been prepared by a very simple method, and the Pt complex has been found to be able to catalyze the asymmetric hydrogenation of Diacetone Alcohol to give (R)-(−)-2-methyl-2,4-pentandiol at room temperature and under atmospheric hydrogen pressure. The product and optical yields of 2-methyl-2,4-pentandiol amounted to 67.0 and 92.7%, respectively. The product and optical yields were remarkably affected by the Pt content in the complex, the kind of solvent and the reaction temperature. This catalyst was very stable and could be reused several times without any remarkable change in optical catalytic activity. Copyright © 2002 John Wiley & Sons, Ltd.

  • Catalytic behavior of a Wool–Pd complex in asymmetric hydrogenation of Diacetone Alcohol and 3-methyl-2-butanone
    Journal of Molecular Catalysis A-chemical, 1999
    Co-Authors: Mao-ya Yin, Guo-li Yuan, Mei-yu Huang, Ying-yan Jiang
    Abstract:

    Abstract A Wool–Pd complex has been found to be able to catalyze the asymmetric hydrogenation of Diacetone Alcohol to (R)-2-methyl-2,4-pentanediol and 3-methyl-2-butanone to (R)-3-methyl-2-butanol at 30°C and under 1 atm H2. The optical yields were greatly affected by Pd content in Wool–Pd complex. When a proper Pd content was selected, (R)-2-methyl-2,4-pentanediol and (R)-3-methyl-2-butanol could be obtained in 73 and 100% optical yield, respectively. This chiral natural biopolymer–Pd complex catalyst was easy to prepare and could be reused without appreciable change in optical catalytic activity.

  • catalytic behavior of a wool pd complex in asymmetric hydrogenation of Diacetone Alcohol and 3 methyl 2 butanone
    Journal of Molecular Catalysis A-chemical, 1999
    Co-Authors: Mao-ya Yin, Guo-li Yuan, Mei-yu Huang, Ying-yan Jiang
    Abstract:

    Abstract A Wool–Pd complex has been found to be able to catalyze the asymmetric hydrogenation of Diacetone Alcohol to (R)-2-methyl-2,4-pentanediol and 3-methyl-2-butanone to (R)-3-methyl-2-butanol at 30°C and under 1 atm H2. The optical yields were greatly affected by Pd content in Wool–Pd complex. When a proper Pd content was selected, (R)-2-methyl-2,4-pentanediol and (R)-3-methyl-2-butanol could be obtained in 73 and 100% optical yield, respectively. This chiral natural biopolymer–Pd complex catalyst was easy to prepare and could be reused without appreciable change in optical catalytic activity.

John K. Gibson - One of the best experts on this subject based on the ideXlab platform.

  • Roles of Acetone and Diacetone Alcohol in Coordination and Dissociation Reactions of Uranyl Complexes
    2016
    Co-Authors: Daniel Rios, George Schoendorff, Michael J. Van Stipdonk, Mark S. Gordon, Theresa L. Windus, John K. Gibson, Wibe A. De Jong
    Abstract:

    Combined collision-induced dissociation mass spectrometry experiments with DFT and MP2 calculations were employed to elucidate the molecular structures and energetics of dissociation reactions of uranyl species containing acetone and Diacetone Alcohol ligands. It is shown that solutions containing Diacetone Alcohol ligands can produce species with more than five oxygen atoms available for coordination. Calculations confirm that complexes with up to four Diacetone Alcohol ligands can be energetically stable but that the effective number of atoms coordinating with uranium in the equatorial plane does not exceed five. Water elimination reactions of Diacetone Alcohol ligands are shown to have two coordination-dependent reaction channels, through formation of mesityl oxide ligands or formation of alkoxide and protonated mesityl oxide species. The present results provide an explanation for the implausible observation of “[UO2(ACO)6,7,8]2+” in and observed water-elimination reactions from purportedly uranyl–acetone complexes (Rios, D.; Rutkowski, P. X.; Van Stipdonk, M. J.; Gibson, J. K. Inorg. Chem. 2011, 50, 4781)

  • Roles of acetone and Diacetone Alcohol in coordination and dissociation reactions of uranyl complexes.
    Inorganic chemistry, 2012
    Co-Authors: Daniel Rios, George Schoendorff, Michael J. Van Stipdonk, Mark S. Gordon, Theresa L. Windus, John K. Gibson, Wibe A. De Jong
    Abstract:

    Combined collision-induced dissociation mass spectrometry experiments with DFT and MP2 calculations were employed to elucidate the molecular structures and energetics of dissociation reactions of uranyl species containing acetone and Diacetone Alcohol ligands. It is shown that solutions containing Diacetone Alcohol ligands can produce species with more than five oxygen atoms available for coordination. Calculations confirm that complexes with up to four Diacetone Alcohol ligands can be energetically stable but that the effective number of atoms coordinating with uranium in the equatorial plane does not exceed five. Water elimination reactions of Diacetone Alcohol ligands are shown to have two coordination-dependent reaction channels, through formation of mesityl oxide ligands or formation of alkoxide and protonated mesityl oxide species. The present results provide an explanation for the implausible observation of "[UO(2)(ACO)(6,7,8)](2+)" in and observed water-elimination reactions from purportedly uranyl-acetone complexes (Rios, D.; Rutkowski, P. X.; Van Stipdonk, M. J.; Gibson, J. K. Inorg. Chem. 2011, 50, 4781).

  • activation of gas phase uranyl Diacetone Alcohol coordination complexes by spectator ligand addition
    European Journal of Inorganic Chemistry, 2012
    Co-Authors: Daniel Rios, John K. Gibson
    Abstract:

    Gas-phase addition of a basic ligand to dipositive uranyl coordination complexes comprising Diacetone Alcohol (DAA) results in water-elimination, which indicates aldol dehydration of DAA to produce mesityl oxide. A novel attribute of the observed gas-phase chemistry is that a ligand exothermically associates to a coordination complex to provide the excitation required to induce chemistry in other ligands, with the added “spectator ligand” remaining intact in the product. Dehydration of DAA was observed for addition of tetrahydrofuran, acetone, and 2-propanol to uranyl complexes [UO2(DAA)2]2+ and [UO2(DAA)(acetone)2]2+. In contrast, [UO2(DAA)2(acetone)]2+ did not exhibit ligand-addition chemistry, which is attributed to a high degree of coordinative saturation at the uranium metal center.

  • Activation of Gas‐Phase Uranyl Diacetone Alcohol Coordination Complexes by Spectator Ligand Addition
    European Journal of Inorganic Chemistry, 2012
    Co-Authors: Daniel Rios, John K. Gibson
    Abstract:

    Gas-phase addition of a basic ligand to dipositive uranyl coordination complexes comprising Diacetone Alcohol (DAA) results in water-elimination, which indicates aldol dehydration of DAA to produce mesityl oxide. A novel attribute of the observed gas-phase chemistry is that a ligand exothermically associates to a coordination complex to provide the excitation required to induce chemistry in other ligands, with the added “spectator ligand” remaining intact in the product. Dehydration of DAA was observed for addition of tetrahydrofuran, acetone, and 2-propanol to uranyl complexes [UO2(DAA)2]2+ and [UO2(DAA)(acetone)2]2+. In contrast, [UO2(DAA)2(acetone)]2+ did not exhibit ligand-addition chemistry, which is attributed to a high degree of coordinative saturation at the uranium metal center.

Daniel Rios - One of the best experts on this subject based on the ideXlab platform.

  • Roles of Acetone and Diacetone Alcohol in Coordination and Dissociation Reactions of Uranyl Complexes
    2016
    Co-Authors: Daniel Rios, George Schoendorff, Michael J. Van Stipdonk, Mark S. Gordon, Theresa L. Windus, John K. Gibson, Wibe A. De Jong
    Abstract:

    Combined collision-induced dissociation mass spectrometry experiments with DFT and MP2 calculations were employed to elucidate the molecular structures and energetics of dissociation reactions of uranyl species containing acetone and Diacetone Alcohol ligands. It is shown that solutions containing Diacetone Alcohol ligands can produce species with more than five oxygen atoms available for coordination. Calculations confirm that complexes with up to four Diacetone Alcohol ligands can be energetically stable but that the effective number of atoms coordinating with uranium in the equatorial plane does not exceed five. Water elimination reactions of Diacetone Alcohol ligands are shown to have two coordination-dependent reaction channels, through formation of mesityl oxide ligands or formation of alkoxide and protonated mesityl oxide species. The present results provide an explanation for the implausible observation of “[UO2(ACO)6,7,8]2+” in and observed water-elimination reactions from purportedly uranyl–acetone complexes (Rios, D.; Rutkowski, P. X.; Van Stipdonk, M. J.; Gibson, J. K. Inorg. Chem. 2011, 50, 4781)

  • Roles of acetone and Diacetone Alcohol in coordination and dissociation reactions of uranyl complexes.
    Inorganic chemistry, 2012
    Co-Authors: Daniel Rios, George Schoendorff, Michael J. Van Stipdonk, Mark S. Gordon, Theresa L. Windus, John K. Gibson, Wibe A. De Jong
    Abstract:

    Combined collision-induced dissociation mass spectrometry experiments with DFT and MP2 calculations were employed to elucidate the molecular structures and energetics of dissociation reactions of uranyl species containing acetone and Diacetone Alcohol ligands. It is shown that solutions containing Diacetone Alcohol ligands can produce species with more than five oxygen atoms available for coordination. Calculations confirm that complexes with up to four Diacetone Alcohol ligands can be energetically stable but that the effective number of atoms coordinating with uranium in the equatorial plane does not exceed five. Water elimination reactions of Diacetone Alcohol ligands are shown to have two coordination-dependent reaction channels, through formation of mesityl oxide ligands or formation of alkoxide and protonated mesityl oxide species. The present results provide an explanation for the implausible observation of "[UO(2)(ACO)(6,7,8)](2+)" in and observed water-elimination reactions from purportedly uranyl-acetone complexes (Rios, D.; Rutkowski, P. X.; Van Stipdonk, M. J.; Gibson, J. K. Inorg. Chem. 2011, 50, 4781).

  • activation of gas phase uranyl Diacetone Alcohol coordination complexes by spectator ligand addition
    European Journal of Inorganic Chemistry, 2012
    Co-Authors: Daniel Rios, John K. Gibson
    Abstract:

    Gas-phase addition of a basic ligand to dipositive uranyl coordination complexes comprising Diacetone Alcohol (DAA) results in water-elimination, which indicates aldol dehydration of DAA to produce mesityl oxide. A novel attribute of the observed gas-phase chemistry is that a ligand exothermically associates to a coordination complex to provide the excitation required to induce chemistry in other ligands, with the added “spectator ligand” remaining intact in the product. Dehydration of DAA was observed for addition of tetrahydrofuran, acetone, and 2-propanol to uranyl complexes [UO2(DAA)2]2+ and [UO2(DAA)(acetone)2]2+. In contrast, [UO2(DAA)2(acetone)]2+ did not exhibit ligand-addition chemistry, which is attributed to a high degree of coordinative saturation at the uranium metal center.

  • Activation of Gas‐Phase Uranyl Diacetone Alcohol Coordination Complexes by Spectator Ligand Addition
    European Journal of Inorganic Chemistry, 2012
    Co-Authors: Daniel Rios, John K. Gibson
    Abstract:

    Gas-phase addition of a basic ligand to dipositive uranyl coordination complexes comprising Diacetone Alcohol (DAA) results in water-elimination, which indicates aldol dehydration of DAA to produce mesityl oxide. A novel attribute of the observed gas-phase chemistry is that a ligand exothermically associates to a coordination complex to provide the excitation required to induce chemistry in other ligands, with the added “spectator ligand” remaining intact in the product. Dehydration of DAA was observed for addition of tetrahydrofuran, acetone, and 2-propanol to uranyl complexes [UO2(DAA)2]2+ and [UO2(DAA)(acetone)2]2+. In contrast, [UO2(DAA)2(acetone)]2+ did not exhibit ligand-addition chemistry, which is attributed to a high degree of coordinative saturation at the uranium metal center.