ChemCatChem

Cover image for Vol. 5 Issue 2

Special Issue: The World of Catalysis – A Perspective from The Netherlands

February 2013

Volume 5, Issue 2

Pages 357–618

  1. Cover Pictures

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. You have free access to this content
      Cover Picture: Carbon Nanomaterials in Catalysis: Proton Affinity, Chemical and Electronic Properties, and their Catalytic Consequences (ChemCatChem 2/2013) (page 357)

      Dr. Jun Zhu, Prof. Anders Holmen and Prof. De Chen

      Version of Record online: 30 JAN 2013 | DOI: 10.1002/cctc.201390000

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      Graphene road to better catalysts! The cover picture shows a roadmap from graphene to rational designed catalysts. In their Review on p. 378 ff., J. Zhu, A. Holmen, and D. Chen discuss the recent progress in theoretical and experimental efforts for obtaining a deep understanding of the effects of carbon nanostructure and surface functional groups on the proton affinity, metal–carbon nanofiber (CNF) interaction, and electronic properties, as well as their catalytic consequences. It is demonstrated that CNFs with different graphene sheet orientations can be used as a platform in rational catalyst design for various reaction systems.

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      Inside Cover: Immobilization of two (R)-Amine Transaminases on an Optimized Chitosan Support for the Enzymatic Synthesis of Optically Pure Amines (ChemCatChem 2/2013) (page 358)

      Hendrik Mallin, Dr. Ulf Menyes, Torge Vorhaben, Prof. Matthias Höhne and Prof. Dr. Uwe T. Bornscheuer

      Version of Record online: 30 JAN 2013 | DOI: 10.1002/cctc.201390001

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      The crab shell catalysts! The cover picture shows a porous structure of chitosan in different magnifications and the reaction scheme for the highly enantioselective amination of 2-hexanone using amine transaminases covalently immobilized on this carrier material, which was obtained from chitin. In their Full Paper on p. 588 ff., U. T. Bornscheuer et al. describe the modification of the chitosan support, the covalent immobilization of three enzymes, and their application in an asymmetric synthesis.

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      Inside Back Cover: Trimethylenemethane-Ruthenium(II)-Triphos Complexes as Highly Active Catalysts for Catalytic C[BOND]O Bond Cleavage Reactions of Lignin Model Compounds (ChemCatChem 2/2013) (page 619)

      Thorsten vom Stein, Tobias Weigand, Carina Merkens, Prof. Jürgen Klankermayer and Prof. Walter Leitner

      Version of Record online: 30 JAN 2013 | DOI: 10.1002/cctc.201390004

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      Split and [Ru]n! The cover picture shows the scission of a β-[O]-4′-glycerolarylether linkage in a lignin model compound through internal hydrogen transfer. In their Communication on p. 439 ff., J. Klankermayer, W. Leitner et al. describe the one-step synthesis of trimethylenemethane-ruthenium(II)-triphos complexes from [Ru(cod)(methally)2] and tripodal phosphine ligands as a catalytic system for hydrogen transfer reactions with unprecedented high activity in the C[BOND]O cleavage.

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      Back Cover: Mechanistic Insight into the Conversion of Tetrose Sugars to Novel α-Hydroxy Acid Platform Molecules (ChemCatChem 2/2013) (page 620)

      Michiel Dusselier, Pieter Van Wouwe, Filip de Clippel, Jan Dijkmans, Prof. Dr. David W. Gammon and Prof. Dr. Bert F. Sels

      Version of Record online: 30 JAN 2013 | DOI: 10.1002/cctc.201390005

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      How to win with tin! The cover picture shows the ability of dissolved tin, the 50th element of Mendeleev's periodic table, to catalyze the conversion of tetrose sugars in alcoholic media via a cascade reaction: an isomerization, two retro-Michael reactions, a hemi-acetalization, a 1,4-addition, and a 1,2-hydride shift. In their Full Paper on p. 569 ff., M. Dusselier, B. F. Sels et al. report on the mechanistic implications of the tetrose transformation with Sn, leading to new four-carbon-backbone α-hydroxy esters such as methyl vinylglycolate (MVG) and methyl-4-methoxy-2-hydroxybutanoate (MMHB), of use in bio-derived polyesters. In situ NMR spectroscopy, deuterium labeling, and control experiments with intermediates revealed the individual pathways in which the kinetic competition between the 1,4-addition and 1,2-hydride shift is key to the product outcome.

  2. Editorial

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. You have free access to this content
      The World of Catalysis—A Perspective from The Netherlands (pages 359–360)

      Prof. Barbara L. Mojet and Prof. Johannes Hendrik Bitter

      Version of Record online: 30 JAN 2013 | DOI: 10.1002/cctc.201300020

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      From academia to industry: Unlike the sea, you cannot hold back catalysis in The Netherlands. Collaborations between academia and industry, and then again to international partners, ensure a strong and vital catalysis community.

  3. Graphical Abstract

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
  4. News

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
  5. Review

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Carbon Nanomaterials in Catalysis: Proton Affinity, Chemical and Electronic Properties, and their Catalytic Consequences (pages 378–401)

      Dr. Jun Zhu, Prof. Anders Holmen and Prof. De Chen

      Version of Record online: 25 JAN 2013 | DOI: 10.1002/cctc.201200471

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      Tube strike: Carbon nanotubes and nanofibers are platform supports, for which the surface proton affinity and electron density can be manipulated by fine-tuning of the CNT/CNF structure and surface functional groups. These properties can change the catalytic performance of the supported metal nanoparticles.

  6. Minireview

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Recent Developments in Flavin-based Catalysis (pages 403–415)

      Dr. Gonzalo de Gonzalo and Prof. Marco W. Fraaije

      Version of Record online: 12 OCT 2012 | DOI: 10.1002/cctc.201200466

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      What to do with vitamin B2: Flavins are ubiquitous cofactors for enzymes and have been explored extensively as organocatalysts. Recent developments in the synthesis and use of flavin derivatives are discussed in this Minireview.

  7. Highlight

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Architecture at the Nanoscale—Self-Pillared Zeolite Nanosheets (pages 417–418)

      Jovana Zečević and Prof. Dr. Krijn P. de Jong

      Version of Record online: 22 NOV 2012 | DOI: 10.1002/cctc.201200596

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      Playing with a full deck: A simple, one-step synthesis of self-pillared zeolite MFI nanosheets was realized with the use of a surprisingly simple structure directing agent. Nanosheets were intergrown in an open “house of cards” arrangement with combined micropores and mesopores. Hierarchical porosity of this catalyst resulted in improved catalytic performance.

  8. Concept

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Substrate Recognition and Regioselective Catalysis with Complexes Bearing NR,NH-NHC Ligands (pages 419–430)

      Prof. Dr. F. Ekkehardt Hahn

      Version of Record online: 8 NOV 2012 | DOI: 10.1002/cctc.201200567

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      The right to keep and bear ligands: Complexes bearing protic N-heterocyclic carbene (NHC) ligands, that is, NHCs with an NR,NH or NH,NH substitution pattern, are promising candidates for bifunctional catalysis because the NH group in these derivatives can act as a molecular recognition unit enabling the selection and preorientation of substrates. Methods for the synthesis of complexes with protic NHC ligands are discussed in this concept article.

  9. Communications

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Chemoselective Hydrogenation of Functionalized Nitroarenes using Supported Mo Promoted Pt Nanoparticles (pages 431–434)

      Evert Boymans, Dr. Susan Boland, Dr. Peter T. Witte, Prof. Christian Müller and Prof. Dieter Vogt

      Version of Record online: 23 NOV 2012 | DOI: 10.1002/cctc.201200437

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      Positive discrimination: Supported MoVI promoted Pt nanoparticles (c-Pt+Mo/C) are successfully applied as catalysts in the chemoselective hydrogenation of functionalized nitroarenes. Mild conditions (30 °C, 4 bar H2, EtOH) prove sufficient for complete reduction to the corresponding anilines, leaving other functional groups untouched. Turnover numbers of at least 20 000 show that this catalyst is very tolerant to halogen-containing aromatics.

    2. Catalytic Conversion of Nitriles into Secondary- and Tertiary Amides (pages 435–438)

      Simge Davulcu, Dr. C. Liana Allen, Kirstie Milne and Prof. Jonathan M. J. Williams

      Version of Record online: 28 SEP 2012 | DOI: 10.1002/cctc.201200406

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      A nice couple: The coupling of nitriles with amines in the presence of water is catalyzed by a combination of zinc triflate and hydroxylamine hydrochloride to give the corresponding amides in good yields.

    3. Trimethylenemethane-Ruthenium(II)-Triphos Complexes as Highly Active Catalysts for Catalytic C[BOND]O Bond Cleavage Reactions of Lignin Model Compounds (pages 439–441)

      Thorsten vom Stein, Tobias Weigand, Carina Merkens, Prof. Jürgen Klankermayer and Prof. Walter Leitner

      Version of Record online: 10 AUG 2012 | DOI: 10.1002/cctc.201200215

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      R u ready for it yet? The reaction of [Ru(cod)(methallyl)2] with tripodal phosphine ligands of the TRIPHOS-type results in the formation of Ru-trimethylenemethane complexes. Evaluation of their catalytic properties revealed a high activity for hydrogen transfer and C[BOND]O cleavage reactions including the hydrogen-free reductive cleavage of 2-aryloxy-1-arylethanols as model compounds for lignin linkages.

  10. Full Papers

    1. Top of page
    2. Cover Pictures
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Concept
    10. Communications
    11. Full Papers
    1. Chlorine and Caesium Promotion of Silver Ethylene Epoxidation Catalysts (pages 443–451)

      Dr. M. Oluş Özbek, Prof. Dr. Işik Önal and Prof. Dr. Rutger A. van Santen

      Version of Record online: 21 JAN 2013 | DOI: 10.1002/cctc.201200690

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      Acetaldehyde chokes on Cl: Cl blocks the oxygen vacant sites on Ag2O(0 0 1) surface and prevents non-selective oxometallacycle formation. Cs and Cl co-exist on the surface in the form of CsClxOy complexes. The main role of these promoters is to stabilize the non-vacant oxy-chloride surface phase that keeps ethylene oxide (EO) selectivity high.

    2. Influence of Extraframework Aluminum on the Brønsted Acidity and Catalytic Reactivity of Faujasite Zeolite (pages 452–466)

      Sami M. T. Almutairi, Brahim Mezari, Georgy A. Filonenko, Dr. Pieter C. M. M. Magusin, Dr. Marcello S. Rigutto, Dr. Evgeny A. Pidko and Prof.Dr. Emiel J. M. Hensen

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/cctc.201200612

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      Paraffin cracking by Brønsted acid sites (BAS) in faujasite zeolites is strongly influenced by the presence of nearby extraframework aluminum (AlEF) species (see picture). Although enhanced acidity of faujasites with decreasing framework Al density is directly evident from COads FTIR spectroscopy, H/D exchange reactions, and paraffin cracking activities, such correlations are less evident for AlEF modified zeolites, which is also discussed in terms of structure.

    3. Enhancement of Catalyst Performance in the Direct Propene Epoxidation: A Study into Gold–Titanium Synergy (pages 467–478)

      Jiaqi Chen, Sander J. A. Halin, Dr. Evgeny A. Pidko, M. W. G. M. (Tiny) Verhoeven, Dulce M. Perez Ferrandez, Prof.Dr. Emiel J. M. Hensen, Prof.Dr. Jaap C. Schouten and Dr. T. Alexander Nijhuis

      Version of Record online: 4 JAN 2013 | DOI: 10.1002/cctc.201200572

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      A productive attraction: Highly active catalysts in the direct epoxidation of propene were achieved by adjusting the site synergy between gold and titanium in a catalyst system made of gold nanoparticles on Ti-grafted silica as the support. High dispersion of gold close to the tetracoordinated Ti provides sufficient Au[BOND]Ti interface leading to the high activity of these catalysts (see picture).

    4. Ceria Nanocatalysts: Shape Dependent Reactivity and Formation of OH (pages 479–489)

      Shilpa Agarwal, Prof. Dr. Leon Lefferts and Dr. Barbara L. Mojet

      Version of Record online: 20 DEC 2012 | DOI: 10.1002/cctc.201200491

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      In great shape for catalysis: Ceria nanoshapes (octahedra, wires, and cubes) were investigated for CO adsorption and subsequent reaction with water. The nanoshapes showed different levels of carbonates and formates after exposure to CO, the amount of carbonates increasing from octahedral≪wires<cubes.

    5. Efficient BiVO4 Thin Film Photoanodes Modified with Cobalt Phosphate Catalyst and W-doping (pages 490–496)

      Fatwa F. Abdi, Nienke Firet and Prof. Dr. Roel van de Krol

      Version of Record online: 30 NOV 2012 | DOI: 10.1002/cctc.201200472

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      Strengthening the weakest link: A chain is no stronger than its weakest link. In this study, we show two important performance limiting factors in BiVO4 photoanodes; water oxidation kinetics and electron transport. Based on this knowledge, the photoanode is modified by surface catalysis and doping, resulting in approximately 3-fold photocurrent improvement.

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      Pt/Al2O3 Catalyzed 1,3-Propanediol Formation from Glycerol using Tungsten Additives (pages 497–505)

      Jeroen ten Dam, Dr. Kristina Djanashvili, Prof. Freek Kapteijn and Prof. Ulf Hanefeld

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/cctc.201200469

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      Tungsten is key: Four commercial catalysts (containing Pt or Pd) and four acidic additives (hydrochloric, tungstic, phosphotungstic, and silicotungstic acids) were used for the conversion of glycerol to propanediols in aqueous solution. The tungsten containing additives are the key to 1,3-propanediol selectivity.

    7. Selective Hydrogenation of α,β-Unsaturated Aldehydes and Ketones using Novel Manganese Oxide and Platinum Supported on Manganese Oxide Octahedral Molecular Sieves as Catalysts (pages 506–512)

      Dr. Haresh G. Manyar, Bo Yang, Dr. Helen Daly, Dr. Helen Moor, Stephen McMonagle, Yu Tao, Prof. Ganapati D. Yadav, Dr. Alexandre Goguet, Prof.  P. Hu and Prof. Christopher Hardacre

      Version of Record online: 29 OCT 2012 | DOI: 10.1002/cctc.201200447

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      The name's Bond, Double Bond: Selective hydrogenation of ketoisophorone and cinnamaldehyde as desired either at C[DOUBLE BOND]C or C[DOUBLE BOND]O double bond was achieved using manganese oxide octahedral molecular sieves (OMS-2) and platinum supported on OMS-2 catalysts.

    8. Alginate as Template in the Preparation of Active Titania Photocatalysts (pages 513–518)

      Mireia Buaki-Sogo, Marco Serra, Ana Primo, Prof. Mercedes Alvaro and Prof. Hermenegildo Garcia

      Version of Record online: 10 OCT 2012 | DOI: 10.1002/cctc.201200386

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      Templating agent on the move! A simple and reliable method to prepare TiO2 and Au/TiO2 samples with high photocatalytic activity for hydrogen generation from water/methanol mixtures is reported, which uses natural alginate as the templating agent.

    9. An Integrated NMR and DFT Study on the Single Insertion of α-Olefins into the M[BOND]C Bond of Group 4 Metallaaziridinium Ion Pairs (pages 519–528)

      Dr. Luca Rocchigiani, Dr. Gianluca Ciancaleoni, Dr. Cristiano Zuccaccia and Prof. Dr. Alceo Macchioni

      Version of Record online: 23 SEP 2012 | DOI: 10.1002/cctc.201200341

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      A pair of Group 4s: Group 4 metallaaziridinium ion pairs stoichiometrically react with α-olefins, such as 1-hexene and 2-methyl-1-heptene, to form stable five-membered heterocycles. An integrated NMR and DFT study indicates that the diastereoisomeric ratios of the products are dictated by thermodynamics and depend strongly on the olefin, but only marginally on the metal.

    10. Highly Selective Bimetallic Pt-Cu/Mg(Al)O Catalysts for the Aqueous-Phase Reforming of Glycerol (pages 529–537)

      Dilek A. Boga, Ramon Oord, Dr. Andrew M. Beale, Dr. Young-Min Chung, Dr. Pieter C. A. Bruijnincx and Prof. Dr. Bert M. Weckhuysen

      Version of Record online: 28 SEP 2012 | DOI: 10.1002/cctc.201200112

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      Basic support, great results: A Cu-promoted Pt catalyst supported on a basic Mg(Al)O support combines high hydrogen selectivity with low methane production in the aqueous-phase reforming of glycerol. Optimization of the composition and treatment of the support and the formation of bimetallic metal particles, as evidenced by EXAFS spectroscopy, are responsible for the high selectivity to hydrogen.

    11. MOFs as Multifunctional Catalysts: Synthesis of Secondary Arylamines, Quinolines, Pyrroles, and Arylpyrrolidines over Bifunctional MIL-101 (pages 538–549)

      Francisco G. Cirujano, Dr. Antonio Leyva-Pérez, Prof. Avelino Corma and Dr. Francesc X. Llabrés i Xamena

      Version of Record online: 18 JAN 2013 | DOI: 10.1002/cctc.201200878

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      Site-seeing with MOFs: Bifunctional MIL-101 MOFs containing Lewis acid Cr3+ sites and Pd or Pt hydrogenation/reduction centers are highly active catalysts for the one-pot conversion of nitro compounds into valuable nitrogen containing chemicals.

    12. Effects of Support, Particle Size, and Process Parameters on Co3O4 Catalyzed H2O Oxidation Mediated by the [Ru(bpy)3]2+ Persulfate System (pages 550–556)

      Dr. Chieh-Chao Yang, Dr. Tamara M. Eggenhuisen, Dr. Mariska Wolters, Dr. Anil Agiral, Dr. Heinz Frei, Dr. Petra E. de Jongh, Prof. Dr. Krijn P. de Jong and Prof. Dr. Guido Mul

      Version of Record online: 16 JAN 2013 | DOI: 10.1002/cctc.201200696

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      Optimizing the path to oxygen: Co3O4 dispersed in porous silica supports (such as SBA-15 and MCM-41) was found to be active in catalytic water oxidation, yielding O2. Different particle sizes of Co3O4 were synthesized by applying NO, or air calcination conditions. Smaller particles are more active in water oxidation than larger ones.

    13. Stable and Efficient Pt–Re/TiO2 catalysts for Water-Gas-Shift: On the Effect of Rhenium (pages 557–564)

      Dr. Khalid G. Azzam, Dr. Igor V. Babich, Prof. Dr. Kulathuiyer Seshan, Dr. Barbara L. Mojet and Prof. Dr. Leon Lefferts

      Version of Record online: 16 JAN 2013 | DOI: 10.1002/cctc.201200492

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      Re enhances water activation: The catalytic performance of Pt–Re/TiO2 catalysts in single-stage water-gas-shift was investigated after optimization of the preparation strategy and identification of the optimum Pt/Re ratio. The improved activity of the Re containing catalyst was explained by its additional redox activity, but was not related to any Re–Pt interactions (see figure).

    14. Increasing the Productivity of Peroxidase-Catalyzed Oxyfunctionalization: A Case Study on the Potential of Two-Liquid-Phase Systems (pages 565–568)

      Ekaterina Churakova, Prof. Dr. Isabel W. C. E. Arends and Dr. Frank Hollmann

      Version of Record online: 5 NOV 2012 | DOI: 10.1002/cctc.201200490

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      A question of solvency: The efficiency of a biocatalytic sulfoxidation is increased by the application of a two-liquid-phase system. Minimization of the mechanical stress proved important for robust sulfoxidation reactions. CPO=chloroperoxidase, FMN=flavin mononucleotide, EDTA=ethylendiamintetraacetate.

    15. Mechanistic Insight into the Conversion of Tetrose Sugars to Novel α-Hydroxy Acid Platform Molecules (pages 569–575)

      Michiel Dusselier, Pieter Van Wouwe, Filip de Clippel, Jan Dijkmans, Prof. Dr. David W. Gammon and Prof. Dr. Bert F. Sels

      Version of Record online: 30 NOV 2012 | DOI: 10.1002/cctc.201200476

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      How to win with tin! Homogeneous tin halides are excellent catalysts for the conversion of tetroses to new four-carbon alpha-hydroxy acid platform molecules. Even at room temperature remarkable activities were displayed. A detailed reaction pathway is proposed and corroborated with an in situ NMR study, labeling and control experiments.

    16. Selective Hydroalkoxylation of 1-Hexene with 1-Propanol and 1-Butanol over Zeolite Beta Catalyst (pages 576–581)

      Sambhu Radhakrishnan, Grete Thoelen, Dr. Joris Franken, Prof. Jan Degrève, Prof. Christine E. A. Kirschhock and Prof. Johan A. Martens

      Version of Record online: 26 NOV 2012 | DOI: 10.1002/cctc.201200464

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      Liquid-phase on a fixed bed: A highly selective liquid-phase process for the hydroalkoxylation of α-olefins such as 1-hexene with bioalcohols such as 1-propanol and 1-butanol over a fixed bed of zeolite beta catalyst is demonstrated.

    17. NanoSelect Pd Catalysts: What Causes the High Selectivity of These Supported Colloidal Catalysts in Alkyne Semi-Hydrogenation? (pages 582–587)

      Dr. Peter T. Witte, Dr. Susan Boland, Dr. Fiona Kirby, Ramon van Maanen, Bas F. Bleeker, D. A. Matthijs de Winter, Prof. Dr. Jan A. Post, Prof. Dr. John W. Geus and Dr. Peter H. Berben

      Version of Record online: 9 NOV 2012 | DOI: 10.1002/cctc.201200460

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      Stepping into the colloid: FIB-SEM analysis of NanoSelect Pd catalysts shows that the metal does not enter the pores of the support. This is the most likely cause of the high selectivity of these catalysts in the semi-hydrogenation of 3-hexyn-1-ol, although an effect of the stabilizer cannot be ruled out.

    18. Immobilization of two (R)-Amine Transaminases on an Optimized Chitosan Support for the Enzymatic Synthesis of Optically Pure Amines (pages 588–593)

      Hendrik Mallin, Dr. Ulf Menyes, Torge Vorhaben, Prof. Matthias Höhne and Prof. Dr. Uwe T. Bornscheuer

      Version of Record online: 9 OCT 2012 | DOI: 10.1002/cctc.201200420

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      Zeaere′s something fischeri going on: Two (R)-amine transaminases (ATA) from Gibberella zeae and Neosartorya fischeri are immobilized efficiently on a chitosan support. In addition to an improved thermostability, the immobilized lactate and glucose dehydrogenases (LDH and GDH) showed significantly higher reaction rates and conversions than the free enzymes in the asymmetric synthesis of (R)-2-aminohexane.

    19. Supported La2O3 and MgO Nanoparticles as Solid Base Catalysts for Aldol Reactions While Suppressing Dehydration at Room Temperature (pages 594–600)

      Dr. Anne Mette Frey, Dr. Sanjib Kumar Karmee, Prof. Krijn Pieter de Jong, Dr. Johannes Hendrik Bitter and Prof. Ulf Hanefeld

      Version of Record online: 5 SEP 2012 | DOI: 10.1002/cctc.201200282

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      La-bile catalysis: La2O3 and MgO nanoparticles (3–4 nm) dispersed on carbon nanofibers are prepared and found to be effective catalysts for aldol reactions at room temperature. A high selectivity of the aldol reaction product is found for both catalysts because the formation of the elimination product is limited. La2O3/CNF is found to be the more robust of the two catalysts.

    20. Solvent-Free Epoxidation of Olefins Catalyzed by “[MoO2(SAP)]”: A New Mode of tert-Butylhydroperoxide Activation (pages 601–611)

      Julien Morlot, Nicolas Uyttebroeck, Dr. Dominique Agustin and Prof. Rinaldo Poli

      Version of Record online: 13 MAY 2012 | DOI: 10.1002/cctc.201200068

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      A Bartlett ballet: [MoO2L]2 complexes (L=SAP, SAE, SAMP) are active and selective precatalysts for the epoxidation of cyclooctene using tert-butylhydroperoxide (TBHP) in water as oxidant and no extra solvent. According to the DFT study; the TBHP oxidant coordinates 5-coordinate “[MoO2(SAP)]” as a neutral molecule; the way in which this transfers the O atom to the external olefin is reminiscent of Bartlett's epoxidation by peroxyacids.

    21. Nanopalladium on Amino-Functionalized Mesocellular Foam: An Efficient Catalyst for Suzuki Reactions and Transfer Hydrogenations (pages 612–618)

      Oscar Verho, Anuja Nagendiran, Dr. Eric V. Johnston, Dr. Cheuk-wai Tai and Prof. Jan-E. Bäckvall

      Version of Record online: 20 SEP 2012 | DOI: 10.1002/cctc.201200247

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      Two birds with one nanostone: A nanopalladium catalyst is highly efficient in Suzuki cross-coupling reactions and transfer hydrogenation of alkenes, resulting in 1) coupling of a wide range of aryl halides with various boronic acids in high yields and 2) chemoselective reduction of a variety of alkenes with 1-methyl-1,4-cyclohexadiene as a hydrogen donor. The “green” catalyst can be recycled several times without any decrease in activity.

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