Chemistry – An Asian Journal

Cover image for Vol. 4 Issue 5

May 4, 2009

Volume 4, Issue 5

Pages 619–775

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Reviews
    6. Communications
    7. Full Papers
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    1. Cover Picture: Monitoring the Formation of Coordination Complexes Using Electrospray Mass Spectrometry (Chem. Asian J. 5/2009) (page 619)

      Jennifer S. Mathieson, Geoffrey J. T. Cooper, Alexandra L. Pickering, Marco Keller, De-Liang Long, Graham N. Newton and Leroy Cronin

      Article first published online: 28 APR 2009 | DOI: 10.1002/asia.200990012

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      The rigid Schiff-base ligand cis,trans-1,3,5-tris(pyridine-2-carboxaldimino) cyclohexane is synthesized, and its complexation to copper(II) salts at a range of stoichiometries is investigated. L. Cronin et al. show that the complexation reaction leads to the crystallization of transition-metal complexes with nuclearities of 1, 2, and 4, and the formation of the complexes can be followed stepwise, in real time, using electrospray mass spectrometry. For more information, see their Full Paper on page 681 ff.

  2. Graphical Abstract

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    3. Graphical Abstract
    4. News
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    1. Graphical Abstract: Chem. Asian J. 5/2009 (pages 620–624)

      Article first published online: 28 APR 2009 | DOI: 10.1002/asia.200990013

  3. News

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

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Reviews
    6. Communications
    7. Full Papers
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    1. Protein Modification

      Chemical Modification of Proteins at Cysteine: Opportunities in Chemistry and Biology (pages 630–640)

      Justin M. Chalker, Gonçalo J. L. Bernardes, Yuya A. Lin and Benjamin G. Davis

      Article first published online: 23 FEB 2009 | DOI: 10.1002/asia.200800427

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      Cys-tematic modification: Cysteine is a versatile amino acid for selective chemical modification of proteins. Both chemical and biological innovations made possible by cysteine modification are highlighted in this Focus Review.

    2. Natural Products

      Current Synthesis of Triterpene Saponins (pages 642–654)

      Biao Yu and Jiansong Sun

      Article first published online: 17 MAR 2009 | DOI: 10.1002/asia.200800462

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      It′s complicated! Triterpene saponins are a structurally and biologically diverse class of glycoconjugates of triterpenes that are widely distributed in terrestrial plants and some marine organisms. Current synthesis of these complex glycoconjugates has been discussed, whereupon the stereocontrolled glycosylation, global protection/deprotection, and the total synthesis of four unusual triterpene saponins are highlighted.

  5. Communications

    1. Top of page
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    6. Communications
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    1. OLEDs

      Tetraaryl-Substituted Benzo[1,2-b:4,5-b′]dipyrroles: Synthesis, Properties, and Applications to Hole-Injection Materials in OLED Devices (pages 655–657)

      Hayato Tsuji, Yuki Yokoi, Chikahiko Mitsui, Laurean Ilies, Yoshiharu Sato and Eiichi Nakamura

      Article first published online: 26 FEB 2009 | DOI: 10.1002/asia.200800471

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      Yes, HIMs can! A series of 2,3,6,7-tetraarylbenzo[1,2-b:4,5-b′]dipyrroles (BDPs) were synthesized using zinc-mediated double cyclization. Organic light-emitting diodes consisting of BDP:PPB as a hole-injection layer could be driven at a lower voltage than a PEDOT:PSS-based device. Correlation of the IP values with the driving voltage shed some light on the mechanism of hole-injection processes.

    2. Mesoporous Nanoparticles

      Fine-Tuning Mesochannel Orientation of Organically Functionalized Mesoporous Silica Nanoparticles (pages 658–661)

      Shy-Guey Wang, Chia-Wen Wu, Kwunmin Chen and Victor S.-Y. Lin

      Article first published online: 16 MAR 2009 | DOI: 10.1002/asia.200900015

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      Three orientations to choose from: 2D hexagonal organically functionalized mesoporous silica nanoparticles with tunable mesochannel orientation (straight, helical, and radial mesochannels) were synthesized through a simple addition of various amounts of ureidopropyltrimethoxylsilane (UDPTMS) in the condensation of tetraorthosilicate (TEOS) in aqueous solution.

  6. Full Papers

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    1. Carbon Nanotubes

      Ultrathin Organically Modified Silica Layer Coated Carbon Nanotubes: Fabrication, Characterization and Electrical Insulating Properties (pages 662–667)

      Martin Pumera, Toshio Sasaki and Břetislav Šmíd

      Article first published online: 4 MAR 2009 | DOI: 10.1002/asia.200900008

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      Nice coat! Organically modified silica (ormosil) is used for the ultrathin nanoprecise coating of individual multiwall carbon nanotubes using a soft-chemistry approach. The coating layer has a uniform thickness of about 3 nm. The ormosil coating demonstrates the favorable electrical insulating properties of individual multiwall carbon nanotubes.

    2. Nonlinear Spectroscopy

      Facile Synthesis and Systematic Investigations of a Series of Novel Bent-Shaped Two-Photon Absorption Chromophores Based on Pyrimidine (pages 668–680)

      Lin Li, Yu-Peng Tian, Jia-Xiang Yang, Ping-Ping Sun, Jie-Ying Wu, Hong-Ping Zhou, Sheng-Yi Zhang, Bao-Kang Jin, Xiao-Juan Xing, Chuan-Kui Wang, Ming Li, Guang-Hua Cheng, Huo-Hong Tang, Wen-Hao Huang, Xu-Tang Tao and Min-Hua Jiang

      Article first published online: 31 MAR 2009 | DOI: 10.1002/asia.200800402

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      Mark us bent! The synthesis, structure, and single- and two-photon spectroscopic properties of a series of pyrimidine-based (bent-shaped) molecules are reported. These allow structure-property relationships and guidelines for both the development and application of TPA compounds to be derived.

    3. Copper Complexation

      Monitoring the Formation of Coordination Complexes Using Electrospray Mass Spectrometry (pages 681–687)

      Jennifer S. Mathieson, Geoffrey J. T. Cooper, Alexandra L. Pickering, Marco Keller, De-Liang Long, Graham N. Newton and Leroy Cronin

      Article first published online: 9 APR 2009 | DOI: 10.1002/asia.200900007

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      Linked-in: The rigid Schiff-base ligand cis,trans-1,3,5-tris(pyridine-2-carboxaldimino) cyclohexane (ttop) is synthesized, and its complexation to copper(II) salts at a range of stoichiometries is investigated crystallographically by using electrospray mass spectrometry. Further, in-situ mass spectrometry measurements allow the stepwise construction of the complexes to be observed.

    4. Natural Products

      Higher Structure of Cereulide, an Emetic Toxin from Bacillus cereus, and Special Comparison with Valinomycin, an Antibiotic from Streptomyces fulvissimus (pages 688–698)

      Arthit Makarasen, Kenji Yoza and Minoru Isobe

      Article first published online: 3 APR 2009 | DOI: 10.1002/asia.200900011

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      Not to be confused: Cereulide is an emetic toxin produced by Bacillus cereus through an unusual non-ribosomal peptide synthesis, whereas valinomycin, produced by Streptomyces fulvissimus, is a known antibiotic drug. Cereulide has a greater complexation ability with metal ions than valinomycin and also exhibits a K+-ion-selective ionophore property at lower concentrations than valinomycin.

    5. Heterogeneous Catalysis

      Efficient Hydrogenation of Benzaldehydes Over Mesopolymer-Entrapped Pt Nanoparticles in Water (pages 699–706)

      Xiaohong Li, Yali Shen, Liying Song, Hongna Wang, Haihong Wu, Yueming Liu and Peng Wu

      Article first published online: 2 MAR 2009 | DOI: 10.1002/asia.200800460

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      Trapped! Mesopolymer-entrapped Pt nanoparticles serve as an efficient catalyst for the hydrogenation of benzaldehydes in water at ambient temperature. In comparison with the commercial Pt/alumina catalyst, the Pt/FDU-14 catalyst shows superior performance in the hydrogenation reaction. The catalyst afforded high turnover frequencies and was reusable more than nine times without loss of activity or selectivity.

    6. Light Harvesting

      Light Harvesting and Efficient Energy Transfer in Dendritic Systems: New Strategy for Functionalized Near-Infrared BF2-Azadipyrromethenes (pages 707–713)

      Mingjian Yuan, Xiaodong Yin, Haiyan Zheng, Canbin Ouyang, Zicheng Zuo, Huibiao Liu and Yuliang Li

      Article first published online: 18 FEB 2009 | DOI: 10.1002/asia.200800391

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      Bright funnels: A series of dendritic systems, which are capable of funneling energy from the periphery to the core, have been synthesized. The photophysical properties of dendrimers have been determined. Selective excitation of the donor leads to an efficient energy transfer (>90 %) to the acceptor. The approach provides a facile synthesis for the modification of near-infrared BF2-Azadipyrromethenes.

    7. Michael Reaction

      On the Relative Preference of Enamine/Iminium Pathways in an Organocatalytic Michael Addition Reaction (pages 714–724)

      Mahendra P. Patil and Raghavan B. Sunoj

      Article first published online: 7 APR 2009 | DOI: 10.1002/asia.200800351

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      The right path: The mechanism of organocatalyzed Michael addition between propanal and methyl vinyl ketone is investigated using the density functional and ab intio methods. The kinetic preference for the formation of key intermediates is established in an effort to identify the competing pathways associated with the reaction. The effect of co-catalyst/protic solvent on the energetics of the reaction is also studied

    8. Total Synthesis

      Total Synthesis of Ouabagenin and Ouabain (pages 725–741)

      Maddi Sridhar Reddy, Hongxing Zhang, Serge Phoenix and Pierre Deslongchamps

      Article first published online: 17 MAR 2009 | DOI: 10.1002/asia.200800429

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      All done! A full account of the total synthesis of ouabagenin and ouabain has been described. The synthesis was achieved through a polyanionic cyclization strategy. Degradation studies provide an ultimate proof for a key intermediate observed in the synthesis.

    9. Phosphorescent Ir III Complexes

      Syntheses, Photophysics, and Application of Iridium(III) Phosphorescent Emitters for Highly Efficient, Long-Life Organic Light-Emitting Diodes (pages 742–753)

      Tsang-Chi Lee, Chiung-Fang Chang, Yuan-Chieh Chiu, Yun Chi, Tzu-Ying Chan, Yi-Ming Cheng, Chin-Hung Lai, Pi-Tai Chou, Gene-Hsiang Lee, Chen-Han Chien, Ching-Fong Shu and Jens Leonhardt

      Article first published online: 17 MAR 2009 | DOI: 10.1002/asia.200800468

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      Long live the OLED! Rational design and synthesis of IrIII complexes bearing two cyclometalated ligands (C N) and one 2-(diphenylphosphino)phenolate chelate (P O) as well as the corresponding IrIII derivatives with only one (C N) ligand and two P O chelates are reported. According to the observed photophysical data, a P O ligand is found to be able to fine-tune the light-emitting electronic transition of these complexes.

    10. Organic Glasses

      The Role of Organic Glasses in cis/trans Photoisomerization at Low Temperatures (pages 754–760)

      Yao-Peng Zhao, Lan-Ying Yang, Charles J. Simmons and Robert S. H. Liu

      Article first published online: 3 APR 2009 | DOI: 10.1002/asia.200900013

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      Into the looking glass! Low temperature photoisomerization studies on some arenes have been studied in different organic glasses. The results are consistent with a possible softening of the glass and offer an explanation for the mechanism of photoisomerization in a confined medium.

    11. Nucleophilic Addition

      Metal-Promoted Nucleophilic Addition and Cyclization of Diamines with Dicyanonitrosomethanide, [C(CN)2(NO)] (pages 761–769)

      Anthony S. R. Chesman, David R. Turner, Glen B. Deacon and Stuart R. Batten

      Article first published online: 21 APR 2009 | DOI: 10.1002/asia.200800323

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      Additional cyclization: Dicyanonitrosomethanide, [C(CN)2(NO)] undergoes nucleophilic addition and cyclization of 1,2-diaminoethane and 1,3-diaminopropane on the nitrile groups to form imidazolinyl and 1,4,5,6-tetrahydropyrimidinyl groups, respectively. Ethanolamine has lower reactivity and fails to cyclize.

  7. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Reviews
    6. Communications
    7. Full Papers
    8. Preview
    1. You have free access to this content
      Preview: Chem. Asian J. 6/2009 (page 775)

      Article first published online: 28 APR 2009 | DOI: 10.1002/asia.200990015

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