ChemCatChem

Cover image for Vol. 2 Issue 4

April 12, 2010

Volume 2, Issue 4

Pages 349–471

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
    9. Preview
    1. Cover Picture: Comparative Study of Copper- and Silver-Catalyzed Protodecarboxylations of Carboxylic Acids (ChemCatChem 4/2010) (page 349)

      Lukas J. Gooßen, Nuria Rodríguez, Christophe Linder, Paul P. Lange and Andreas Fromm

      Article first published online: 1 APR 2010 | DOI: 10.1002/cctc.201090014

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      The cover picture shows the reaction coordinate for copper-mediated protodecarboxylation. Starting on the left, 2-fluorobenzoic acid has to cross the summit, assisted by a copper(I) dimethoxyphenanthroline complex, in order to lose carbon dioxide and reach the right side as fluorobenzene. In their paper on page 430 ff., Gooßen et al. present mechanistic studies on copper- and silver-catalyzed decarboxylations leading to the discovery of low-temperature decarboxylation catalysts (illustration by Filipe Manjolinho).

  2. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
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    1. Graphical Abstract: ChemCatChem 4/2010 (pages 351–355)

      Article first published online: 1 APR 2010 | DOI: 10.1002/cctc.201090015

  3. News

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
    9. Preview
  4. Minireview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
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    1. Magnetic Nanocomposites: A New Perspective in Catalysis (pages 365–374)

      Yinghuai Zhu, Ludger Paul Stubbs, Feny Ho, Rongzhen Liu, Chee Peng Ship, John A. Maguire and Narayan S. Hosmane

      Article first published online: 23 MAR 2010 | DOI: 10.1002/cctc.200900314

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      Magnet cum laude: The use of magnetic nanoparticles in catalysis has been a major development at the frontiers of both symmetric and asymmetric syntheses. Magnetic nanoparticle-supported catalyst systems have made remarkable progress from activity and recyclability standpoints. This Minireview addresses recent catalytic applications of magnetic nanocomposites, including a discussion of commonly used synthetic methods.

  5. Highlights

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
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    1. Enantioselective 6 π Electrocyclizations: Pushing the Limits in Organocatalytic Pericyclic Reactions (pages 375–378)

      Jose L. Vicario and Dolores Badia

      Article first published online: 4 FEB 2010 | DOI: 10.1002/cctc.200900324

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      Catalysis sans frontières: Enantioselective catalysis has been achieved for 6 π electrocyclizations. Two recent reports have shown that this particular pericyclic reaction can be carried out in a catalytic and highly enantioselective way, provided that careful design of the structure of the substrate is made. Excellent results have been obtained under organocatalytic conditions, with catalysts operating by different mechanisms.

    2. Enantioselective Organocatalytic Strecker Reactions in the Synthesis of α-Amino Acids (pages 379–381)

      Jürgen Martens

      Article first published online: 4 FEB 2010 | DOI: 10.1002/cctc.200900301

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      Both the classical Strecker three- component one-pot synthesis and the hydrocyanation of preformed imines (modified Strecker reaction) can be made enantioselective, affording optically active α-amino acids, through the application of suitable organocatalysts. Several new and simple organocatalysts with high selectivity and activity have been introduced recently with the potential to be stable enough for catalyst recovery and immobilization.

  6. Communications

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    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
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    1. Gas-Phase Selective Oxidation of Benzyl Alcohol to Benzaldehyde with Molecular Oxygen over Unsupported Nanoporous Gold (pages 383–386)

      Dongqing Han, Tingting Xu, Jixin Su, Xiaohong Xu and Yi Ding

      Article first published online: 27 JAN 2010 | DOI: 10.1002/cctc.201000001

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      Dealloyed forces: Nanoporous gold, made by selective etching of Ag–Au alloys, exhibits extraordinary catalytic activity towards the gas-phase oxidation of benzyl alcohol to form benzaldehyde with selectivities up to 98.2 %, using molecular oxygen as an oxidant under relatively low-temperature conditions.

    2. Rhodium-Catalyzed Hydroformylation Using Hindered Phosphine Ligands: An In Situ Study (pages 387–391)

      Eoin Rafter, Declan G. Gilheany, Joost N. H. Reek and Piet W. N. M. van Leeuwen

      Article first published online: 5 MAR 2010 | DOI: 10.1002/cctc.200900313

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      Ligands behaving badly: A series of hindered biaryl phosphine compounds are used as ligands in rhodium- catalyzed hydroformylation. In situ analysis of the resultant catalysts under operating conditions shows that the ligands are dissociated under high pressures of syngas, thereby creating an unselective rhodium catalyst for the hydroformylation.

    3. An Efficient Procedure for Chloromethylation of Aromatic Hydrocarbons Catalyzed by PEG1000-Dicationic Ionic Liquids in Aqueous Media (pages 392–396)

      Yu Lin Hu, Qiang Ge, Yu He and Ming Lu

      Article first published online: 27 JAN 2010 | DOI: 10.1002/cctc.200900268

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      Chloromethylation of aromatic hydrocarbons is catalyzed by the recyclable and temperature-dependent phase- separation system composed of PEG1000-dicationic ionic liquid (DIL) and methylcyclohexane in aqueous media to give products in good to excellent yields.

    4. Catalytic Effects on Thermal Oxidation of Single-Walled Carbon Nanotubes by Alkali Metal Chlorides (pages 397–401)

      Yuki Kobayashi and Masahito Sano

      Article first published online: 1 FEB 2010 | DOI: 10.1002/cctc.200900307

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      The walled is not enough: Alkali metal chlorides lower the combustion temperature of single-walled carbon nanotubes by more than 100 K. Unlike ordinary reactions of nanotubes, the oxidation reaction in the presence of these salts is independent of the tube diameter, defects, and the degree of bundling. Furthermore, they produce no additional soot upon combustion.

    5. Exceptionally Active Single-Site Nanocluster Multifunctional Catalysts for Cascade Reactions (pages 402–406)

      John M. Thomas, Robert Raja, Pratibha L. Gai, Henrik Grönbeck and Juan C. Hernández-Garrido

      Article first published online: 28 FEB 2010 | DOI: 10.1002/cctc.200900258

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      Cluster's last stand: Metal nanoparticles, which are well known for their catalytic properties, contain 103–106 atoms in each particle, giving rise to a continuous band of electronic energy levels. As a result, they are very different electronically from metal nanoclusters composed of aggregates of approximately 3–20 atoms. Such nanoclusters themselves exhibit remarkable catalytic performances in hydrogenation and ammoxidation cascade reactions.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
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    1. Stable Bulky Particles Formed by TS-1 Zeolite Nanocrystals in the Presence of H2O2 (pages 407–412)

      Zhichao Shan, Zhenda Lu, Liang Wang, Cong Zhou, Limin Ren, Lin Zhang, Xiangju Meng, Shujie Ma and Feng-Shou Xiao

      Article first published online: 23 FEB 2010 | DOI: 10.1002/cctc.200900312

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      Fat boy slim: Mechanically stable bulky TS-1 (B-TS-1) catalysts are synthesized in the presence of H2O2 and are successfully collected by a filtration route. The B-TS-1 zeolite, formed by strong interactions of the nanocrystals with each other, shows high catalytic activity in phenol hydroxylation and is easily separated for recycling.

    2. Nickel(II) Nitrate vs. Acetate: Influence of the Precursor on the Structure and Reducibility of Ni/MCM-41 and Ni/Al-MCM-41 Catalysts (pages 413–422)

      Eric Marceau, Michel Che, Jiří Čejka and Arnošt Zukal

      Article first published online: 9 MAR 2010 | DOI: 10.1002/cctc.200900289

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      Pickled anions: Nickel(II) nitrate is the precursor most often used in the preparation of Ni/SiO2 catalysts However, when nickel(II) acetate is used as a precursor for supported catalysts, the anion plays multiple roles, from tuning the cation–support interactions by setting the pH close to neutrality, to abstracting Al3+ ions from the support and potentially disrupting the support structure.

    3. Ring-Closing Metathesis of Acrylates: A Comparative Study (pages 423–429)

      Bernd Schmidt and Diana Geißler

      Article first published online: 1 FEB 2010 | DOI: 10.1002/cctc.200900282

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      Closed for business: Second-generation benzylidene and indenylidene complexes both catalyze the ring-closing metathesis (RCM; see scheme) of acrylates to butenolides in good yields. The initial concentration of the substrate is a more important factor in the success of metathesis-based butenolide synthesis than the amount of catalyst used.

    4. Comparative Study of Copper- and Silver-Catalyzed Protodecarboxylations of Carboxylic Acids (pages 430–442)

      Lukas J. Gooßen, Nuria Rodríguez, Christophe Linder, Paul P. Lange and Andreas Fromm

      Article first published online: 18 MAR 2010 | DOI: 10.1002/cctc.200900277

      Thumbnail image of graphical abstract

      The protodecarboxylation of aromatic carboxylic acids with various copper and silver catalysts is investigated with the help of density functional calculations and experimental studies. A silver(I) catalyst promotes the protodecarboxylation of various carboxylic acids at temperatures in the range of 80–120 °C—more than 50 °C below the best known copper(I) catalyst. It is particularly effective for ortho-substituted benzoates.

    5. Vanadium Phosphate Oxide Seeds and Their Influence on the Formation of Vanadium Phosphate Catalyst Precursors (pages 443–452)

      Raja Al Otaibi, Weihao Weng, Jonathan K. Bartley, Nicholas F. Dummer, Christopher J. Kiely and Graham J. Hutchings

      Article first published online: 4 FEB 2010 | DOI: 10.1002/cctc.200900274

      Thumbnail image of graphical abstract

      Seeds of change: Vanadium phosphate oxides (VPO) were prepared with the use of hemihydrate ‘seeds’ and evaluated for selective butane oxidation. This seeding concept is shown to have a dramatic effect on the morphology of the final activated catalyst. In the case of the reaction of VOPO4⋅2 H2O in 3-octanol with a VOHPO4⋅0.5 H2O seed, a mixed phase was formed which has a specific activity almost 2.5 times greater than the standard VPO preparation.

    6. Palladium-Catalyzed Enantioselective Hydrosilylation of Aromatic Olefins (pages 453–458)

      Kathrin Junge, Bianca Wendt, Stephan Enthaler and Matthias Beller

      Article first published online: 9 MAR 2010 | DOI: 10.1002/cctc.200900263

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      All you need is H8: Palladium-catalyzed asymmetric hydrosilylation of C[DOUBLE BOND]C double bonds is carried out using monodentate H8-phosphoramidite ligands. High yields and enantioselectivities up to 90 % ee are achieved under mild conditions for a broad range of substituted styrenes. A correlation between the enantioselectivity and electronic properties of the ligand was demonstrated by NMR spectroscopy.

    7. Oxidative Desulfurization of Aromatic Sulfur Compounds over Titanosilicates (pages 459–466)

      Guohua Gao, Shifu Cheng, Ying An, Xiaojuan Si, Xianlei Fu, Yueming Liu, Haijiao Zhang, Peng Wu and Ming-Yuan He

      Article first published online: 8 FEB 2010 | DOI: 10.1002/cctc.200900073

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      Putting an end to sulfuring: The catalytic activity as well as shape selectivity of several titanosilicates for the oxidation of aromatic sulfur compounds is investigated. Owing to its unique pore structure, an organosilicate with the MWW topology demonstrates an activity for sulfur compounds that is superior to other titanosilicates.

  8. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlights
    7. Communications
    8. Full Papers
    9. Preview
    1. Preview: ChemCatChem 5/2010 (page 471)

      Article first published online: 1 APR 2010 | DOI: 10.1002/cctc.201090017

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