Angewandte Chemie International Edition

Cover image for Vol. 46 Issue 29

July 16, 2007

Volume 46, Issue 29

Pages 5449–5631

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Cover Picture: Organocatalytic Highly Enantioselective α-Arylation of β-Ketoesters / Asymmetric Organocatalytic α-Arylation of Aldehydes (Angew. Chem. Int. Ed. 29/2007) (page 5449)

      José Alemán, Bo Richter, Karl Anker Jørgensen, Silvia Cabrera, Eddy Maerten and Jacob Overgaard

      Article first published online: 5 JUL 2007 | DOI: 10.1002/anie.200790138

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      One, but not the same describes the painting “Double Me” (Michael Kvium) depicted on the cover which shows two men who appear at first to be competing. However, on closer inspection it appears that their shoes are joined together: Are they in fact cooperating? An analogy is drawn to two organocatalytic enantioselective arylation reactions presented in the Communications by K. A. Jørgensen and co-workers on pages 5515 and 5520 ff. Both reactions feature quinone but follow noncovalent (left) and covalent (right) organocatalytic pathways. (Thanks to M. Kvium for permission to use the painting.)

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Inside Cover: Phase Selection of Calcium Carbonate through the Chirality of Adsorbed Amino Acids (Angew. Chem. Int. Ed. 29/2007) (page 5450)

      Stephan E. Wolf, Niklas Loges, Bernd Mathiasch, Martin Panthöfer, Ingo Mey, Andreas Janshoff and Wolfgang Tremel

      Article first published online: 5 JUL 2007 | DOI: 10.1002/anie.200790139

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      Chiral crystallization additives can determine the phase selection of calcium carbonate. W. Tremel and co-workers show this phenomenon in their Communication on page 5618 ff. for D and L amino acids, which adsorb chiroselectively on the surface of terraced calcite surfaces. Conversely, calcite may serve as a template during the formation of homochiral amino acids from racemic precursors.

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Graphical Abstract: Angew. Chem. Int. Ed. 29/2007 (pages 5453–5463)

      Article first published online: 5 JUL 2007 | DOI: 10.1002/anie.200790140

  4. News

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
  5. Book Reviews

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
  6. Highlights

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Molecules That Make Decisions (pages 5472–5475)

      Alberto Credi

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200700879

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      It's logical! Molecular logic gates and circuits process chemical or physical inputs according to programmed Boolean logic functions. The integration of functions within individual molecules allows complex operations, as demonstrated by a recently reported molecular keypad access device (see picture).

    2. Forcing and Controlling Chemical Reactions with Ultrasound (pages 5476–5478)

      Giancarlo Cravotto and Pedro Cintas

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701567

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      Sound bubbles: Their collapse induces mechanical stress that can be transmitted to a target single bond by means of mechanosensitive polymers attached to the two sides of a benzocyclobutene. As surprising as it may be, ultrasound guides molecules into forbidden pathways by promoting the formation of only one isomer regardless of the starting benzocyclobutene.

  7. Essay

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Gold in a Metallic Divided State—From Faraday to Present-Day Nanoscience (pages 5480–5486)

      Peter P. Edwards and John Meurig Thomas

      Article first published online: 11 JUN 2007 | DOI: 10.1002/anie.200700428

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      Very minute in their dimensions is how Faraday described the metal particles present in a fine dispersion of colloidal gold upon observing its interaction with red light 150 years ago (see picture for a laser-light version of his experiment). This observation would come to serve as the basis for the modern nanoscience and nanotechnology of gold, including the use of gold nanoparticles in catalytic processes and the formation of self-assembled monolayers.

  8. Review

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Total Synthesis of Complex Cyclotryptamine Alkaloids: Stereocontrolled Construction of Quaternary Carbon Stereocenters (pages 5488–5508)

      Alan Steven and Larry E. Overman

      Article first published online: 25 JUN 2007 | DOI: 10.1002/anie.200700612

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      Filling the void: Efficient and flexible syntheses of many complex cyclotryptamine alkaloids are now possible because of the development of a set of stereocontrolled methods for accessing their multiple quaternary carbon stereocenters. The key steps include a cascade of Heck reactions or asymmetric dialkylation followed by an asymmetric Heck reaction (see scheme).

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Hierarchical Self-Assembly of One-Dimensional Streptavidin Bundles as a Collagen Mimetic for the Biomineralization of Calcite (pages 5510–5514)

      Sabina Burazerovic, Julieta Gradinaru, Julien Pierron and Thomas R. Ward

      Article first published online: 24 MAY 2007 | DOI: 10.1002/anie.200701080

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      Bundle up: The introduction of streptavidin (as a linker) between two FeII(terpyridine–bis-biotin) connectors affords a one-dimensional metal–organic protein framework (MOPF). In the presence of calcium ions and CO2 vapors, these MOPF aggregates form protein bundles that template the biomineralization of calcite.

    2. Organocatalytic Highly Enantioselective α-Arylation of β-Ketoesters (pages 5515–5519)

      José Alemán, Bo Richter and Karl Anker Jørgensen

      Article first published online: 24 MAY 2007 | DOI: 10.1002/anie.200701009

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      Quintessential quinones: The reaction of β-ketoesters with quinones provides a strategy to perform α-arylations, particularly when the α-aryl ring contains electron-donating groups. The reaction can be carried out enantioselectively by using cinchona alkaloids as organocatalysts and allows the synthesis of complicated polycyclic and spiro chiral compounds.

    3. Asymmetric Organocatalytic α-Arylation of Aldehydes (pages 5520–5523)

      José Alemán, Silvia Cabrera, Eddy Maerten, Jacob Overgaard and Karl Anker Jørgensen

      Article first published online: 24 MAY 2007 | DOI: 10.1002/anie.200701207

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      Quinone pro quo: The organocatalytic enantioselective α-arylation of aldehydes using quinones as the aromatic partner was carried out. The reaction proceeds well using H2O or EtOH/H2O mixtures as solvent. The corresponding optically active α-arylated aldehydes are obtained in high yields and with excellent enantioselectivities (see scheme; TMS: trimethylsilyl).

    4. Annularly Fused Hexapyrrolohexaazacoronenes: An Extended π System with Multiple Interior Nitrogen Atoms Displays Stable Oxidation States (pages 5524–5527)

      Masayoshi Takase, Volker Enkelmann, Daniel Sebastiani, Martin Baumgarten and Klaus Müllen

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701452

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      The heteroatom-stabilized annularly fused hexapyrrolohexaazacoronene shown (N blue, F green) was synthesized and isolated as a representation of a new class of nitrogen-containing molecules with extended π systems. The reversible redox behavior, a consequence of the interior N atoms, hints at potential applications in organic electronics.

    5. Squaraine Rotaxanes: Superior Substitutes for Cy-5 in Molecular Probes for Near-Infrared Fluorescence Cell Imaging (pages 5528–5531)

      James R. Johnson, Na Fu, Easwaran Arunkumar, W. Matthew Leevy, Seth T. Gammon, David Piwnica-Worms and Bradley D. Smith

      Article first published online: 22 JUN 2007 | DOI: 10.1002/anie.200701491

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      It's hip to be square: Squaraine rotaxanes have very similar photophysical properties to the commonly used Cy-5 fluorophore, but are substantially more photostable and resist self-quenching upon aggregation. Molecular probes containing squaraine rotaxanes (see structure) are shown to be versatile, high-performance NIR fluorescence stains for in vitro fluorescence imaging of cells (middle) and in vivo whole-body imaging of living mice (right).

    6. Electrochromism and Stable n-Type Doping of Highly Oriented Thin Films of Tetrakis(thiadiazole)porphyrazine (pages 5532–5536)

      Yasuhito Miyoshi, Megumi Kubo, Tasuku Fujinawa, Yosuke Suzuki, Hirofumi Yoshikawa and Kunio Awaga

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200700702

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      Reduced and reoxidized: Thin films (100 nm) of tetrakis(thiadiazole)porphyrazine (see picture) are highly ordered in an unusual orientation of the molecular planes owing to the strong self-assembling ability of these crystals. Electrochemical reduction of the thin films induces reversible electrochromism and n-type carrier doping.

    7. Asymmetric Crystal Growth of α-Resorcinol from the Vapor Phase: Surface Reconstruction and Conformational Change Are the Culprits (pages 5537–5540)

      Jamshed Anwar, Jittima Chatchawalsaisin and John Kendrick

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701127

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      Differential growth: The growth of crystals of α-resorcinol (see picture; C gray, H white, O red) from the vapor phase is asymmetric along the polar axis. By means of molecular-dynamics simulations, the slower growth at the (011) polar surface is traced back to conformational change of the molecule and to surface reconstruction, which may be a general phenomenon in polar crystals.

    8. Supramolecular Construction of Fluorescent J-Aggregates Based on Hydrogen-Bonded Perylene Dyes (pages 5541–5544)

      Theo E. Kaiser, Hao Wang, Vladimir Stepanenko and Frank Würthner

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701139

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      Luminous nanorods: The self-assembly of core-twisted perylene bisimide fluorophores (see structures) in nonpolar organic solvents is directed by hydrogen-bonding interactions. This supermolecular concept resulted in one-dimensional J-aggregates with a fluorescence quantum yield of near unity.

    9. What is Amphidinolide V? Report on a Likely Conquest (pages 5545–5548)

      Alois Fürstner, Oleg Larionov and Susanne Flügge

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701640

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      The awesome power of metathesis is reflected in the synthesis of the proposed structure of the cytotoxic natural product amphidinolide V, as well as of all other stereomers containing a trans-epoxide unit. It can be concluded from the comprehensive data set obtained that the 8S,9R,10R,13S-configured compound 1 most likely represents amphidinolide V, even though a single resonance in the 1H NMR spectrum deviates from the reported value.

    10. A Fluorophore Capable of Crossword Puzzles and Logic Memory (pages 5549–5553)

      Zhiqian Guo, Weihong Zhu, Liangjun Shen and He Tian

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200700526

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      Puzzlingly logical: The characteristic fluorescence of Hg2+-selective OFF-ON and Cu2+-selective ON-OFF operations can be monitored and controlled reversibly by the sequence and ratio of Hg2+ and Cu2+ inputs. These inputs have been used to construct a molecular keyboard that is capable of crossword puzzles and logic memory (see picture).

    11. Suzuki–Miyaura Coupling Reaction by PdII-Catalyzed Aromatic C[BOND]H Bond Activation Directed by an N-Alkyl Acetamino Group (pages 5554–5558)

      Zhangjie Shi, Bijie Li, Xiaobing Wan, Jiang Cheng, Zhao Fang, Bin Cao, Changming Qin and Yang Wang

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200700590

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      A seamless join: An efficient method to construct a C(sp2)[BOND]C(sp2) bond has been developed by using a Suzuki–Miyaura-type coupling of N-alkyl acetanilides with boronic acids. The reaction was catalyzed by a PdII species and the C[BOND]H bond activation was directed by the acetamino group (see scheme). This reaction offers a halogen-free method to construct complicated structures.

      Corrected by:

      Corrigendum: Suzuki–Miyaura Coupling Reaction by PdII-Catalyzed Aromatic C[BOND]H Bond Activation Directed by an N-Alkyl Acetamino Group

      Vol. 46, Issue 41, 7730, Article first published online: 4 OCT 2007

    12. Ruthenium Hydride Catalyzed Regioselective Addition of Aldehydes to Enones To Give 1,3-Diketones (pages 5559–5561)

      Takahide Fukuyama, Takashi Doi, Satoshi Minamino, Sohei Omura and Ilhyong Ryu

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701005

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      It all adds up: Straightforward access to 2-alkyl-substituted 1,3-diketones is provided by a regioselective addition of aldehydes to enones catalyzed by the ruthenium hydride catalyst [RuHCl(CO)(PPh3)3] (see scheme). The reaction involves a hydrometalation of the enone to form a metal enolate, a cross-aldol reaction to form an alkoxymetal species, and a subsequent β-metal hydride elimination.

    13. Experimental and Theoretical Studies of the Scandium Carbide Endohedral Metallofullerene Sc2C2@C82 and Its Carbene Derivative (pages 5562–5564)

      Yuko Iiduka, Takatsugu Wakahara, Koji Nakajima, Tsukasa Nakahodo, Takahiro Tsuchiya, Yutaka Maeda, Takeshi Akasaka, Kenji Yoza, Michael T. H. Liu, Naomi Mizorogi and Shigeru Nagase

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701049

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      It's what's on the inside that counts: The structure of Sc2C2@C82(III), as suggested by 13C NMR spectroscopy and density functional calculations (see picture, left; C red and gray, Sc blue), contains two Sc and two C atoms inside the C82 cage. This mode of encapsulation is verified by X-ray single-crystal analysis of the cycloadduct of Sc2C2@C82(III) and adamantylidene carbene (see picture, right).

    14. Chiral Brønsted Acid Catalyzed Enantioselective Friedel–Crafts Reaction of Indoles and α-Aryl Enamides: Construction of Quaternary Carbon Atoms (pages 5565–5567)

      Yi-Xia Jia, Jun Zhong, Shou-Fei Zhu, Can-Ming Zhang and Qi-Lin Zhou

      Article first published online: 22 JUN 2007 | DOI: 10.1002/anie.200701067

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      Sexpress: Quaternary carbon atoms are constructed in excellent yields with high enantioselectivities by a highly efficient chiral Brønsted acid catalyzed Friedel–Crafts reaction of indoles and α-aryl enamides (see scheme). The presence of H atoms on the N atoms of both the indole and enamide moieties is essential for the reaction to occur. The indole molecule attacks from the Re face to give S-configured products.

    15. Synthesis of Molecular Vanadium(III) Phosphonates (pages 5568–5571)

      Sumit Khanra, Marc Kloth, Hassanatu Mansaray, Christopher A. Muryn, Floriana Tuna, E. Carolina Sañudo, Madeleine Helliwell, Eric J. L. McInnes and Richard E. P. Winpenny

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701115

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      All in the family: Organophosphonate complexes of high-valent vanadium are common, but their VIII analogues are few and far between. Reaction of VCl3 precursors and phosphonates under solvothermal conditions leads to a family of corresponding vanadium(III)-based phosphonates, including the layered {VIII12(VIVO)} cluster shown in the picture (V green, P purple, O red, C black). Preliminary magnetic studies are also reported.

    16. Mimicking Fructose and Rhamnulose Aldolases: Organocatalytic syn-Aldol Reactions with Unprotected Dihydroxyacetone (pages 5572–5575)

      S. S. V. Ramasastry, Klaus Albertshofer, Naoto Utsumi, Fujie Tanaka and Carlos F. Barbas III

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701269

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      Completing the quattuorvirate: Amino acids that contain primary amines directly catalyze syn-selective asymmetric aldol reactions between unprotected dihydroxyacetone and a variety of aromatic and aliphatic aldehydes (see scheme). This new strategy provides the organocatalytic mimics of the L-rhamnulose 1-phosphate and D-fructose 1,6-diphosphate aldolases.

    17. Total Synthesis of (+)-Isomigrastatin (pages 5576–5579)

      Isaac J. Krauss, Mihirbaran Mandal and Samuel J. Danishefsky

      Article first published online: 21 JUN 2007 | DOI: 10.1002/anie.200701837

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      Marginally stable natural products: The asymmetric total synthesis of the hydrolytically and thermally labile natural product (+)-isomigrastatin was demonstrated. The thermodynamic instability of a 2E-configured double bond in the context of this 12-membered macrolide was further demonstrated by phosphine-catalyzed isomerization to the 2Z configuration.

    18. Kinetic Control and Multiple Mechanisms for C[BOND]H Bond Activation by a Zr[DOUBLE BOND]N Complex (pages 5580–5582)

      Helen M. Hoyt and Robert G. Bergman

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701816

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      The [Cp*CpZr[DOUBLE BOND]NCMe3(thf)] system provides the first direct measurement of kinetic selectivity in sp, sp2, and sp3 C[BOND]H bond activation with Group 4 imido complexes. This feature allows the design of selectivity and mechanistic experiments to probe the 1,2-RH-addition event. Substrates reacting with the highest relative rates generally form the most thermodynamically stable products. Cp*=η5-C5Me5, Cp=η5-C5H5.

    19. Efficient CuO-Nanoparticle-Catalyzed C[BOND]S Cross-Coupling of Thiols with Iodobenzene (pages 5583–5586)

      Laxmidhar Rout, Tamal K. Sen and Tharmalingam Punniyamurthy

      Article first published online: 6 JUN 2007 | DOI: 10.1002/anie.200701282

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      Cheap but good: Readily available CuO nanoparticles are not only less expensive than other catalysts used for the C[BOND]S cross-coupling of thiols with aryl halides, but they are also effective at a moderate temperature and low concentration. The title reaction proceeds with a variety of alkyl and aryl thiols to give the corresponding sulfides in high yields (see scheme).

    20. N-Tosylhydrazones as Reagents for Cross-Coupling Reactions: A Route to Polysubstituted Olefins (pages 5587–5590)

      José Barluenga, Patricia Moriel, Carlos Valdés and Fernando Aznar

      Article first published online: 19 JUN 2007 | DOI: 10.1002/anie.200701815

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      Metal-free partner: No organometallic coupling partner is required for a Pd-catalyzed cross-coupling reaction that employs N-tosylhydrazones as the nucleophilic component (see scheme; Ts=4-toluenesulfonyl).

    21. Extrusion of Boron(III) Subporphyrin from meso-Heptakis(pentafluorophenyl)[32]heptaphyrin upon Cooperative CuII and BIII Metalation (pages 5591–5593)

      Shohei Saito, Kil Suk Kim, Zin Seok Yoon, Dongho Kim and Atsuhiro Osuka

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200701682

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      An uneven split: Cooperative CuII and BIII metalation of meso-heptakis(pentafluorophenyl)[32]heptaphyrin (1) triggers an extrusion reaction to produce BIIImeso-tris(pentafluorophenyl)[14]subporphyrin (2) along with a CuII porphyrin (3-Cu). Subporphyrin 2 exhibits unique optical properties that reflect the rotational restriction of its electron-withdrawing substituents.

    22. Discrimination and Selective Enhancement of Signals in the MALDI Mass Spectrum of a Protein by Combining a Matrix-Based Label for Lysine Residues with a Neutral Matrix (pages 5594–5597)

      David Lascoux, David Paramelle, Gilles Subra, Michaël Heymann, Christophe Geourjon, Jean Martinez and Eric Forest

      Article first published online: 25 JUN 2007 | DOI: 10.1002/anie.200700811

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      Discrimination with a difference: The N-hydroxysuccinimide ester of HCCA (α-cyano-4-hydroxycinnamic acid) was used as a labeling reagent to increase the MALDI MS signal of weakly concentrated peptides of interest in a proteolytic mixture derived from cytochrome c relative to the signals of other peptides. The desired effect was only observed with the neutral MALDI matrix HCCE (the methyl ester of HCCA; see mass spectra).

    23. Gold-Catalyzed Intermolecular Addition of Carbonyl Compounds to 1,6-Enynes (pages 5598–5601)

      Mathias Schelwies, Adrian L. Dempwolff, Frank Rominger and Günter Helmchen

      Article first published online: 21 JUN 2007 | DOI: 10.1002/anie.200701378

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      Gold rush: Gold catalysis remains a highly attractive field of research for the discovery of new reaction types. A novel intermolecular addition of aldehydes and ketones to enynes leads to the diastereoselective synthesis of 2-oxabicyclo[3.1.0]hexanes (see scheme).

    24. An Artificial Base Pair, Mediated by Hydrogen Bonding and Metal-Ion Binding (pages 5602–5604)

      Fabian-Alexander Polonius and Jens Müller

      Article first published online: 22 JUN 2007 | DOI: 10.1002/anie.200700315

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      Silver service: Addition of silver(I) to an oligonucleotide comprising 1-deazaadenine and thymine nucleobases leads to the formation of a Hoogsteen-type double helix with specific binding of one metal ion per base pair (see scheme). Each base pair is mediated by one hydrogen bond and by two coordination bonds.

    25. Shell-in-Shell Microcapsules: A Novel Tool for Integrated, Spatially Confined Enzymatic Reactions (pages 5605–5608)

      Oliver Kreft, Michelle Prevot, Helmuth Möhwald and Gleb B. Sukhorukov

      Article first published online: 21 JUN 2007 | DOI: 10.1002/anie.200701173

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      The Matryoshka theory: This unique type of shell-in-shell microcapsule facilitates the stable spatial separation of biopolymers (enzymes) within distinct compartments of a single capsule entity. Architecture and wall properties of this system allow for the concerted action of enzymes from separate capsule compartments by metabolite diffusion across a semipermeable, intersecting polyelectrolyte membrane.

    26. Boosting the Throughput of Separation Techniques by “Multiplexing” (pages 5609–5613)

      Oliver Trapp

      Article first published online: 21 JUN 2007 | DOI: 10.1002/anie.200605128

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      This is IT for chemical analysis: The use of structured sample injection sequences (bar codelets) in chromatography allows to increase the sample throughput by self-encoding of individual samples and mathematical deconvolution of the overlapping chromatograms (see picture). Analysis of up to 453 samples per hour could be achieved with a single separation column in gas chromatography.

    27. Thermal Activation of Methane by Group 10 Metal Hydrides MH+: The Same and Not the Same (pages 5614–5617)

      Maria Schlangen and Helmut Schwarz

      Article first published online: 18 MAY 2007 | DOI: 10.1002/anie.200605145

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      Small electronic changes matter! All three Group 10 metal hydrides MH+ (M=Ni, Pd, Pt) bring about thermal C[BOND]H bond activation of methane, but for each system the potential energy surfaces and thus the mechanisms of the ligand exchange MH+ + CH4[RIGHTWARDS ARROW]M(CH3)+ + H2 differ.

    28. Phase Selection of Calcium Carbonate through the Chirality of Adsorbed Amino Acids (pages 5618–5623)

      Stephan E. Wolf, Niklas Loges, Bernd Mathiasch, Martin Panthöfer, Ingo Mey, Andreas Janshoff and Wolfgang Tremel

      Article first published online: 21 JUN 2007 | DOI: 10.1002/anie.200700010

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      On the phase of it: The phase selection of calcium carbonate (spheres: C gray, Ca green, O red) is determined by chiral amino acids (stick models) present during the crystallization. The interplay of composition and chirality of the crystal surfaces and additives leads to enantiospecific adsorption of the D and L amino acids on chiral surface steps. The resulting surface passivation creates a kinetic barrier, which controls the phase selection.

    29. CO2 Activation by ZnO through the Formation of an Unusual Tridentate Surface Carbonate (pages 5624–5627)

      Yuemin Wang, Roman Kováčik, Bernd Meyer, Konstantinos Kotsis, Dorothee Stodt, Volker Staemmler, Hengshan Qiu, Franziska Traeger, Deler Langenberg, Martin Muhler and Christof Wöll

      Article first published online: 20 JUN 2007 | DOI: 10.1002/anie.200700564

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      Greenhouse gas “al dente”: Exposure of the nonpolar ZnO(10equation image0) surface to CO2 at 95 K leads to the formation of an unusual tridentate carbonate species (see picture; C green, O red, Zn gray). Use of several experimental techniques (for example, high-resolution electron energy loss spectroscopy (HREELS)) and theoretical calculations provides insight into the activation of CO2 on the surface.

  10. Preview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Reviews
    7. Highlights
    8. Essay
    9. Review
    10. Communications
    11. Preview
    1. Preview: Angew. Chem. Int. Ed. 30/2007 (page 5631)

      Article first published online: 5 JUL 2007 | DOI: 10.1002/anie.200790142

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