Chemistry – An Asian Journal

Cover image for Vol. 4 Issue 10

October 5, 2009

Volume 4, Issue 10

Pages 1503–1631

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
    8. Preview
    1. Cover Picture: Truxene-Based Columnar Liquid Crystals: Self-Assembled Structures and Electro-Active Properties (Chem. Asian J. 10/2009) (page 1503)

      Kyosuke Isoda, Takuma Yasuda and Takashi Kato

      Version of Record online: 30 SEP 2009 | DOI: 10.1002/asia.200990033

      Thumbnail image of graphical abstract

      Columnar liquid-crystalline (LC) truxene derivatives containing branched flexible alkyl chains have been designed and synthesized by T. Kato et al. The dicyanomethylene and dithiafulvene substituents have been introduced into the π-conjugated truxene framework to tune their electronic and redox properties as well as the molecular assembled structures. The π-conjugated cores of dicyanomethylene- and dithiafulvene-appended truxenes adopt bowl-shaped conformations, giving rise to a large intrinsic dipole moment perpendicular to the aromatic framework. These molecules form stable columnar LC structures through intermolecular dipole–dipole interactions. The redox properties of LC truxene derivatives have been examined by cyclic voltammetry. For the details, turn to their Full Paper on page 1619 ff.

  2. Graphical Abstract

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

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

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
    8. Preview
    1. Electrocatalytic Recycling

      Electrocatalytic Recycling of CO2 and Small Organic Molecules (pages 1516–1523)

      Jaeyoung Lee, Youngkook Kwon, Revocatus L. Machunda and Hye Jin Lee

      Version of Record online: 3 JUL 2009 | DOI: 10.1002/asia.200900055

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      Combat global warming: CO2 gas can be reduced through an electrochemical route in zero-gap cells to form carbon fuels (Cn). The type of fuels produced depends mainly on the reaction conditions and the electrocatalysts. CO2 reduction system can be integrated into the fuel cell configuration to utilize C1 fuels while producing supporting power to the electrochemical reduction of CO2 gas.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
    8. Preview
    1. Fluorous Pores

      Fluorous Pores in Coordination Networks (pages 1524–1526)

      Minsul Jang, Takumi Yamaguchi, Kazuaki Ohara, Masaki Kawano and Makoto Fujita

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/asia.200900293

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      Fluorous nanophase in the pore: Perfluoroalkyl chain-anchored bridging ligands are assembled, upon complexation with Co(NCS)2, into coordination networks with fluorous pores that show fluorophilic/organophobic properties. The perfluoroalkyl chains are considerably disordered and seem to tumble in the pores, forming a nanoscopic pseudo liquid phase in the solid.

    2. Tandem Reactions

      Highly Functionalized 4-Alkylidenebicyclo[3.1.0]hex-2-enes by Tandem Michael Addition and Annulation of Electron-Deficient Enynes (pages 1527–1529)

      Zuliang Chen and Junliang Zhang

      Version of Record online: 22 AUG 2009 | DOI: 10.1002/asia.200900290

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      Rapid access: Highly functionalized 4-alkylidenebicyclo[3.1.0]hex-2-enes can be rapidly constructed by a tandem Michael addition and formal [3+2] cycloaddition of electron deficient enynes with a crotonate-derived sulfur ylide. The stereochemistry of all three newly formed carbon stereogenic centers and the double bond can be highly controlled in this domino process.

    3. Magnetic Solids

      Synthesis and Magnetic Properties of Ba2Mn2Si2O9: the First Example of S=2 Spin-Dimer with Spin-Singlet Ground State (pages 1530–1535)

      Zhangzhen He, Myung-Hwan Wangbo, Yutaka Ueda, Yasuo Narumi, Koichi Kindo, Tomoyasu Taniyama, Mitsuru Itoh and Wendan Cheng

      Version of Record online: 27 JUL 2009 | DOI: 10.1002/asia.200900235

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      Correlation of structure and property: Ba2Mn2Si2O9 consists of Mn2O8 dimers made up of two basal-edge-sharing MnO5 square pyramids. Magnetic measurements show that this material displays a spin-singlet ground state with a large spin gap. The spin-dimer analysis suggests that the origin of the spin gap is likely to arise from a large intra-dimer interaction between the Mn1O5 and Mn2O5 square pyramids.

    4. Nanomaterials

      Chemically Activated Boron Nitride Nanotubes (pages 1536–1540)

      C. Y. Zhi, Y. Bando, T. Terao, C. C. Tang, H. Kuwahara and D. Golberg

      Version of Record online: 3 SEP 2009 | DOI: 10.1002/asia.200900158

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      Functionalizing nanotubes: An easy method is developed to functionalize boron nitride nanotubes. Hydrogen peroxide is used to oxidize the surface of pristine BN nanotubes to get hydroxylated BN nanotubes, which are chemically active for further functionalization. The Figure shows hydroxylated BN nanotubes can be well dispersed in water (left), while pristine BN nanotubes are hydrophobic (right).

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
    8. Preview
    1. Single Molecule Studies

      Synthesis and Photophysics of Core-Substituted Naphthalene Diimides: Fluorophores for Single Molecule Applications (pages 1542–1550)

      Toby D. M. Bell, Sheryll Yap, Chintan H. Jani, Sheshanath V. Bhosale, Johan Hofkens, Frans C. De Schryver, Steven J. Langford and Kenneth P. Ghiggino

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/asia.200900215

      Thumbnail image of graphical abstract

      Neither a wink nor a blink: Single naphthalene diimide molecules such as this core-substituted variety (see Figure) show strong emission with very few interruptions or “blinks” and excellent photostability in PMMA films with some single molecules emitting tens of millions of photons before photobleaching.

    2. Gold Catalysis

      Graphite-Supported Gold Nanoparticles as Efficient Catalyst for Aerobic Oxidation of Benzylic Amines to Imines and N-Substituted 1,2,3,4-Tetrahydroisoquinolines to Amides: Synthetic Applications and Mechanistic Study (pages 1551–1561)

      Man-Ho So, Yungen Liu, Chi-Ming Ho and Chi-Ming Che

      Version of Record online: 23 SEP 2009 | DOI: 10.1002/asia.200900261

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      Gold nanoparticles catalysis: Using the graphite-supported gold nanoparticles (AuNPs/C) as a catalyst, a variety of benzylic amines have been oxidized to imines or amides by oxygen with high product yields. This “AuNPs/C+O2” protocol features high catalyst reusability and can be applied to amine oxidation on a 10-gram scale.

    3. Nanomaterials

      Supramolecular Surface Modification and Solubilization of Single-Walled Carbon Nanotubes with Cyclodextrin Complexation (pages 1562–1572)

      Sheng-Zhen Zu, Xu-Xia Sun, Yuanqin Liu and Bao-Hang Han

      Version of Record online: 17 AUG 2009 | DOI: 10.1002/asia.200900119

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      Stick it on the side! Cyclodextrin complexes of synthetic molecules that contain a planar pyrene moiety or a shape-fitted triptycene moiety as a binding group were used to attach onto the sidewalls of SWCNTs. This yielded a supramolecular system that allowed SWCNTs to dissolve in the aqueous phase through the formed hydrophilic cyclodextrin shell.

    4. Nitrogen Heterocycles

      Library-directed Solution- and Solid-phase Synthesis of 2,4-Disubstituted Pyridines: One-pot Approach through 6 π-Azaelectrocyclization (pages 1573–1577)

      Taku Sakaguchi, Toyoharu Kobayashi, Sho Hatano, Hiroshi Tsuchikawa, Koichi Fukase, Katsunori Tanaka and Shigeo Katsumura

      Version of Record online: 18 AUG 2009 | DOI: 10.1002/asia.200900146

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      One-pot magic! An efficient one-pot procedure for the preparation of 2,4-disubstituted pyridines has been established through a 6π-azaelectrocyclization-aromatization sequence. A variety of pyridine structures have been constructed from three substrates and a palladium catalyst. The method was further applied to the solid-phase synthesis where the use of a “traceless” sulfonamide linker enabled the rapid preparation of a small library of pyridines with high purity, without any chromatographic separation.

    5. Supramolecular Aggregates

      One-Dimensional Polymers Based on Silver(I) Cations and Organometallic cyclo-P3 Ligand Complexes (pages 1578–1587)

      Laurence J. Gregoriades, Brian K. Wegley, Marek Sierka, Eike Brunner, Christian Gröger, Eugenia V. Peresypkina, Alexander V. Virovets, Manfred Zabel and Manfred Scheer

      Version of Record online: 3 SEP 2009 | DOI: 10.1002/asia.200900309

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      New rings on the block: The first supramolecular aggregates incorporating the cyclo-P3 ligand complexes [CpRMo(CO)23-P3)] (CpR=Cp (C5H5), Cp* (C5(CH3)5)) have been isolated and comprehensively characterized. The products consist of one-dimensional polycationic chains and amongst them is also the first example of a homoleptic complex in which silver is octahedrally coordinated to six phosphorus atoms (see Figure; blue: molybdenum, pink: phosphorus, orange: silver; Cp and CO ligands omitted).

    6. Amides

      Salts and Ionic Liquids of Resonance Stabilized Amides (pages 1588–1603)

      Harald Brand, Jörn Martens, Peter Mayer, Axel Schulz, Markus Seibald and Thomas Soller

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/asia.200900181

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      ILs built tough: The synthesis, structure, and bonding of alkali salts of resonance stabilized amides are discussed on the basis of experimental and theoretical data. Additionally, several novel ionic liquids based on the resonance stabilized amides have been prepared and are fully characterized. These ionic liquids are neither heat nor shock sensitive, are thermally stable up to over 200 °C, and can be prepared easily in large quantities.

    7. Cyclization

      Lewis Acid-Assisted Ene Cyclization of 2-Azetidinone-Tethered Enals: Synthesis of Enantiopure Carbacepham Derivatives (pages 1604–1611)

      Benito Alcaide, Pedro Almendros, Carmen Pardo, Carolina Rodríguez-Ranera and Alberto Rodríguez-Vicente

      Version of Record online: 17 AUG 2009 | DOI: 10.1002/asia.200900165

      Thumbnail image of graphical abstract

      Multiple transformations: A variety of 2-azetidinone-tethered enals can be transformed into functionalized bicyclic β-lactams of the carbacephem antibiotic class by Lewis acid-promoted intramolecular ene reactions. The stereochemical outcome of these carbonyl-ene cyclizations leading to carbacepham derivatives can be explained in terms of six-membered, cyclic chair-like transition-state models. The formation of halocarbacepham derivatives is proposed to proceed by a stepwise mechanism.

    8. Host–Guest Systems

      Guest-Directed Supramolecular Architectures of {W36} Polyoxometalate Crowns (pages 1612–1618)

      Thomas McGlone, Carsten Streb, De-Liang Long and Leroy Cronin

      Version of Record online: 24 AUG 2009 | DOI: 10.1002/asia.200900242

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      Be my guest: A set of five novel supramolecular host–guest architectures based on the incorporation of long-chain alkyldiammonium guest cations in anionic {W36} host clusters illustrate the structure-directing effects of the guest cations. The systematic variation of the chain lengths allowed the formation of dimers, trimers, and infinite chains, demonstrating the importance of the “soft” guest molecules in the assembly of “hard” hybrids.

    9. Liquid Crystals

      Truxene-Based Columnar Liquid Crystals: Self-Assembled Structures and Electro-Active Properties (pages 1619–1625)

      Kyosuke Isoda, Takuma Yasuda and Takashi Kato

      Version of Record online: 24 JUN 2009 | DOI: 10.1002/asia.200900038

      Thumbnail image of graphical abstract

      Functional bowls: The dicyanomethylene and dithiafulvene substituents have been introduced into the π-conjugated truxene framework to tune the electronic and redox properties as well as the molecular assembled structures. The dicyanomethylene- and dithiafulvene-appended truxenes function as the electron acceptor or the electron donor, respectively.

  7. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
    8. Preview
    1. Preview: Chem. Asian J. 11/2009 (page 1631)

      Version of Record online: 30 SEP 2009 | DOI: 10.1002/asia.200990036

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