ChemCatChem

Cover image for Vol. 1 Issue 4

December 7, 2009

Volume 1, Issue 4

Pages 421–519

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Highlights
    7. Communications
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      Cover Picture: Studies on Dehydrogenation of Ethane in the Presence of CO2 over Octahedral Molecular Sieve (OMS-2) Catalysts (ChemCatChem 4/2009) (page 421)

      Lei Jin, Justin Reutenauer, Naftali Opembe, Monique Lai, Daniel J. Martenak, Scott Han and Steven L. Suib

      Version of Record online: 30 NOV 2009 | DOI: 10.1002/cctc.200990013

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      The cover picture shows the reaction scheme for the dehydrogenation of ethane over the octahedral molecular sieve OMS-2 in the presence of carbon dioxide. This reaction is put into action by Suib et. al. in their Communication on page 441 ff., with high ethane and carbon dioxide conversions and high selectivity towards the product ethylene. The reaction pathway is shown to involve two steps: ethane catalytic dehydrogenation and a reverse watergas shift reaction. The inexpensive OMS-2 catalyst is highly stable throughout the reaction and the presence of carbon dioxide lessens coke depositions on the catalyst surface.

  2. Inside Cover

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    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
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    7. Communications
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      Inside Cover: Composite Particles of Novozyme 435 and Silicone: Advancing Technical Applicability of Macroporous Enzyme Carriers (ChemCatChem 4/2009) (page 422)

      Lars O. Wiemann, René Nieguth, Marrit Eckstein, Matthias Naumann, Oliver Thum and Marion B. Ansorge-Schumacher

      Version of Record online: 30 NOV 2009 | DOI: 10.1002/cctc.200990014

      Thumbnail image of graphical abstract

      The inside cover picture shows a scanning electron microscope image of a particle of the biocatalyst Novozym 435, a lipase immobilized on a macroporous carrier. A silicone coating can aid the mechanical and leaching stability of catalyst while retaining its activity, as demonstrated by Thum, Ansorge-Schumacher et al. in their paper on page 455 ff.

  3. Graphical Abstract

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    5. News
    6. Highlights
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  4. News

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  5. Highlights

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      Nanostructured Catalysts from the Liquid–Liquid Interface (pages 435–436)

      Ryan M. Richards

      Version of Record online: 9 OCT 2009 | DOI: 10.1002/cctc.200900192

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      Face to Face: Understanding and utilizing nanoscale materials in catalysis requires control not only over size and shape, but also over surface structuring. A recent study by O′Brien et al. demonstrated the assembly of nanoscale ceria by growth at liquid–liquid interfaces, which, by alteration of growth times, pH values, and temperatures, affords a high level of control over ceria particle size.

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      The Holy Grail of Organocatalysis: Intermolecular α-Alkylation of Aldehydes (pages 437–439)

      Andrea-Nekane Alba, Mònica Viciano and Ramon Rios

      Version of Record online: 27 OCT 2009 | DOI: 10.1002/cctc.200900196

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      This is the cup of a chemist: Organocatalytic intermolecular α-alkylation has been accomplished. The groups of Melchiorre and Cozzi have recently reported the realization of this long-time goal in organocatalysis, by the crucial use of stabilized carbocations. Alkylated products are obtained in good yields and with moderate to good enantioselectivities.

  6. Communications

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    1. Studies on Dehydrogenation of Ethane in the Presence of CO2 over Octahedral Molecular Sieve (OMS-2) Catalysts (pages 441–444)

      Lei Jin, Justin Reutenauer, Naftali Opembe, Monique Lai, Daniel J. Martenak, Scott Han and Steven L. Suib

      Version of Record online: 15 SEP 2009 | DOI: 10.1002/cctc.200900149

      Thumbnail image of graphical abstract

      A breath of fresh air: The octahedral molecular sieve (OMS-2) catalyst shows outstanding catalytic activity, selectivity, and stability in the dehydrogenation of ethane into ethylene in the presence of CO2. This process can be extended for other alkanes, giving an ideal feedstock for any process involving alkene carbonylation, as a greenhouse gas, CO2, can be recycled.

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      A High-Throughput Screening Method for Chiral Alcohols and its Application to Determine Enantioselectivity of Lipases and Esterases (pages 445–448)

      Ismael Bustos-Jaimes, Werner Hummel, Thorsten Eggert, Eliane Bogo, Michael Puls, Andrea Weckbecker and Karl-Erich Jaeger

      Version of Record online: 6 OCT 2009 | DOI: 10.1002/cctc.200900190

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      A new colorimetric method to determine the enantiopurity of chiral alcohols is presented based on enantioselective oxidation by two alcohol dehydrogenases. The oxidation of either (R)- or (S)-alcohol produces NADPH (or NADH), which reduces 2-(4-iodophenyl)-3-(4- nitrophenyl)-5-phenyl-2H-tetrazolium to its corresponding formazan derivative. Application of this method to screen lipase variant libraries for enantioselective hydrolysis is also described.

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      Correlation Between Catalytic Activity and Metal Cation Coordination: NO Decomposition Over Cu/Zeolites (pages 449–453)

      Angeles Pulido and Petr Nachtigall

      Version of Record online: 26 OCT 2009 | DOI: 10.1002/cctc.200900219

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      Just say NO: The catalytic activity of Cu/zeolites for NO removal depends on the metal cation coordination to the framework. The most active catalysts are those with CuI loosely coordinated to the framework. The catalytic cycle is investigated using a periodic DFT model to account for the effect of the zeolite on the stability of reaction intermediates.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Highlights
    7. Communications
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      Composite Particles of Novozyme 435 and Silicone: Advancing Technical Applicability of Macroporous Enzyme Carriers (pages 455–462)

      Lars O. Wiemann, René Nieguth, Marrit Eckstein, Matthias Naumann, Oliver Thum and Marion B. Ansorge-Schumacher

      Version of Record online: 23 OCT 2009 | DOI: 10.1002/cctc.200900199

      Thumbnail image of graphical abstract

      Leach out (Si'll be there): The mechanical and leaching stability of enzymes adsorbed on macroporous carriers both benefit from the deposition of silicone on the carrier surface. For silicone-coated Novozyme 435, maximum leaching stability corresponds to the formation of a complete layer of silicone on the outer surface of the carrier at silicone concentrations of 54 % w/w and more (see picture). This layer also aids mechanical stabilization.

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      Fructose-1,6-Bisphosphate Aldolase-Mediated Synthesis of Aminocyclitols (Analogues of Valiolamine) and their Evaluation as Glycosidase Inhibitors (pages 463–471)

      Lahssen El Blidi, Zeinab Assaf, Flora Camps Bres, Henri Veschambre, Vincent Théry, Jean Bolte and Marielle Lemaire

      Version of Record online: 6 OCT 2009 | DOI: 10.1002/cctc.200900151

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      The synthesis of nitrocyclitols is performed in a one-pot process with two enzymes (RAMA and phytase) and three reactions in which two carbon–carbon bonds are formed with high stereoselectivity. Four stereocenters are created and an enantiomerically pure compound is isolated for each aldehyde tested. The inhibition properties of the corresponding amines show selectivity for β-Glc and β-Gal.

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      Highly Enhanced Phenol Hydroxylation in [h0h]-Oriented Fe–ZSM-5 Membranes (pages 472–478)

      Lin Lang, Xiufeng Liu, Mingliang Hu and Baoquan Zhang

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/cctc.200900152

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      Phenol Fantasy: The use of the [h0h]-oriented Fe–ZSM-5 membrane in the interphase membrane reactor significantly promotes the hydroxylation of phenol due to molecular path control in the zeolite membranes and exhibits superior catalytic activity compared to various different-sized Fe–ZSM-5 grains loaded in a traditional slurry reactor.

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      The Effect of Bromide Pretreatment on the Performance of Supported Au–Pd Catalysts for the Direct Synthesis of Hydrogen Peroxide (pages 479–484)

      Edwin Ntainjua N., Marco Piccinini, James C. Pritchard, Qian He, Jennifer K. Edwards, Albert F. Carley, Jacob A. Moulijn, Christopher J. Kiely and Graham J. Hutchings

      Version of Record online: 14 OCT 2009 | DOI: 10.1002/cctc.200900171

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      Rise and fall of the bromine empire: Pretreating Au–Pd catalysts supported on MgO and C with aqueous bromide solution, prior to using them for the direct synthesis of hydrogen peroxide, is shown to enhance productivity. However, the effects are short lived as small particles can leach out of the catalysts.

    5. Vanadium-Containing Oxynitrides: Effective Catalysts for the Ammoxidation of 3-Picoline (pages 485–491)

      Christiane Janke, Jörg Radnik, Ursula Bentrup, Andreas Martin and Angelika Brückner

      Version of Record online: 13 OCT 2009 | DOI: 10.1002/cctc.200900180

      Thumbnail image of graphical abstract

      Through space and time: Vanadium-containing oxynitride (VMON; M=Al, Zr) catalysts give the highest space–time yields (STY) yet detected for 3-picoline (3-PIC) ammoxidation, due to a high V site dispersion, a mean surface V valence state close to +4, the formation of V[BOND]N[BOND]M moieties, the reversible incorporation of N in the catalyst surface, and a negligible surface acidity.

    6. Sm3+-Doped Bi2O3 Photocatalyst Prepared by Hydrothermal Synthesis (pages 492–496)

      Jakkidi Krishna Reddy, Basavaraju Srinivas, Valluri Durga Kumari and Machiraju Subrahmanyam

      Version of Record online: 10 NOV 2009 | DOI: 10.1002/cctc.200900189

      Thumbnail image of graphical abstract

      Making degrade: The photocatalytic activity of Sm-doped Bi2O3 catalysts is investigated for the degradation of methylene blue and phenol under solar light. These catalysts, with a decreased band gap and increased separation efficiency of electron-hole pairs, show increased photocatalytic activity in comparison to Bi2O3 and TiO2.

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      γ-Alumina-Supported Silver Cluster for N-Benzylation of Anilines with Alcohols (pages 497–503)

      Kenichi Shimizu, Masanari Nishimura and Atsushi Satsuma

      Version of Record online: 2 NOV 2009 | DOI: 10.1002/cctc.200900209

      Thumbnail image of graphical abstract

      A silver lining in every catalyst: Silver clusters on γ-Al2O3 catalyze the N- alkylation of anilines with alcohols in the presence of a catalytic amount of Lewis acid. The reaction proceeds by cooperation of coordinatively unsaturated silver, acid, and base sites of the oxide support.

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      NaOH-Promoted Hydrogen Transfer: Does NaOH or Traces of Transition Metals Catalyze the Reaction? (pages 504–509)

      Armelle Ouali, Jean-Pierre Majoral, Anne-Marie Caminade and Marc Taillefer

      Version of Record online: 9 NOV 2009 | DOI: 10.1002/cctc.200900237

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      Back to basics: NaOH is revealed as an excellent (cheap, nontoxic, easy-to-handle) catalyst for the hydrogenation of a wide range of aromatic and aliphatic ketones, which can be converted in high yields into the corresponding alcohols. However, the reaction pathway is unclear: is it a Meerwein–Ponndorf–Verley-like process or are traces of transition metals present in commercial NaOH responsible for the activity?

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      Gold Sols as Catalysts for Glycerol Oxidation: The Role of Stabilizer (pages 510–514)

      Alberto Villa, Di Wang, Dang Sheng Su and Laura Prati

      Version of Record online: 30 OCT 2009 | DOI: 10.1002/cctc.200900118

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      Unsupported gold sols stabilized by a range of protective agents have been synthesized and tested in the liquid-phase oxidation of glycerol. From transmission electron microscopy and from the catalytic tests, it appears that the stabilizing agent plays an important role, not only in the stability of the gold sol but also in the catalytic performance.

  8. Preview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Highlights
    7. Communications
    8. Full Papers
    9. Preview
    1. Preview: ChemCatChem 1/2010 (page 519)

      Version of Record online: 30 NOV 2009 | DOI: 10.1002/cctc.200990017

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