Chemistry – An Asian Journal

Cover image for Vol. 4 Issue 2

February 2, 2009

Volume 4, Issue 2

Pages 215–339

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Reviews
    6. Communications
    7. Full Papers
    8. Preview
    1. Cover Picture: “Half-Bonds” in an Unusual Coordinated S42− Rectangle (Chem. Asian J. 2/2009) (page 215)

      Anne Poduska, Roald Hoffmann, Andrea Ienco and Carlo Mealli

      Version of Record online: 26 JAN 2009 | DOI: 10.1002/asia.200990000

      Thumbnail image of graphical abstract

      This stone lantern is known as the “Koto-ji”, or “harp-tuner”, as it resembles the tuning bridge of the Japanese koto. The six windows of the lantern are said to symbolize the six essential attributes of a perfect garden, such as the one it overlooks: spaciousness, seclusion, artifice, antiquity, abundant water, and broad views. R. Hoffmann et al. report on two synthesized compounds containing the unusual S42− rectangles bound to either Ir or Rh fragments, illuminated by the two lamp windows. Like the Koto-ji lantern, this paper, which suggests the presence of S[BOND]S half-bonds, sheds some light in the garden of beautiful compounds. For more information, see their Full Paper on page 302 ff.

  2. Graphical Abstract

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

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

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

      Self-Assembled Organic Microtubes from Amphiphilic Molecules (pages 226–235)

      Ho Yong Lee, Seong Ryong Nam and Jong-In Hong

      Version of Record online: 22 SEP 2008 | DOI: 10.1002/asia.200800224

      Thumbnail image of graphical abstract

      Getting the sizes sorted out: In recent years, there have been increasing numbers of reports about self-assembled nano- or microtubular structures because of their potential uses in a variety of technical applications, which are largely determined by the tube sizes. This Focus Review highlights microsized self-assembled organic tubular structures formed in aqueous solutions and organic solvents.

    2. Nanostructures

      Colloidal Lithography—The Art of Nanochemical Patterning (pages 236–245)

      Gang Zhang and Dayang Wang

      Version of Record online: 5 NOV 2008 | DOI: 10.1002/asia.200800298

      Thumbnail image of graphical abstract

      Nanochemical printmaking: Colloidal lithography paves a powerful nanochemical way for patterning on planar substrates and microparticles. The feature size can easily be scaled down to 100 nm by reducing the diameter of the microspheres and the feature shape diversified by the crystalline structure of a colloidal crystal mask, the mask etching time, the incidence angle of the vapor beam, and the mask registry (the azimuth angle of the vapor beam).

  5. Communications

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

      Diphenylprolinol Silyl Ether as a Catalyst in an Enantioselective, Catalytic Michael Reaction for the Formation of α,α-Disubstituted α-Amino Acid Derivatives (pages 246–249)

      Yujiro Hayashi, Kazuki Obi, Yusuke Ohta, Daichi Okamura and Hayato Ishikawa

      Version of Record online: 8 DEC 2008 | DOI: 10.1002/asia.200800394

      Thumbnail image of graphical abstract

      Direct and enantioselective: Diphenylprolinol silyl ether was found to catalyze the direct, asymmetric Michael reaction of 4-substituted 2-aryl-2-oxazoline-5-one and α,β-unsaturated aldehydes, affording the chiral α,α-disubstituted α-amino acid derivatives with excellent enantioselectivity.

    2. Carbon Nanotubes

      Imaging of Oxygen-Containing Groups on Walls of Carbon Nanotubes (pages 250–253)

      Martin Pumera

      Version of Record online: 12 NOV 2008 | DOI: 10.1002/asia.200800321

      Thumbnail image of graphical abstract

      A method for highly precise and high-resolution imaging and location of oxygen-containing groups on the walls of carbon nanotubes (CNTs) is presented. The soft-chemistry approach is used by means of tagging oxygen-containing groups on the surface of CNTs with EuIII through coordinate covalent bonds. EuIII ions bonded to oxygen-containing groups are observed by high-angle annular dark-field scanning TEM.

  6. Full Papers

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

      Crystal Engineering Approach To Design Colorimetric Indicator Array To Discriminate Positional Isomers of Aromatic Organic Molecules (pages 254–261)

      Darshak R. Trivedi, Yuzo Fujiki, Norifumi Fujita , Seiji Shinkai and Kazuki Sada

      Version of Record online: 15 DEC 2008 | DOI: 10.1002/asia.200800341

      Thumbnail image of graphical abstract

      Discriminating by color: A 2D colorimetric indicator array has been designed by a crystal engineering approach (N⋅⋅⋅H[BOND]O hydrogen bonding and charge-transfer complexation) involving solid-state co-grinding for the visual discrimination of positional isomers of dihydroxynaphthalene. Factors governing the close packing of π planes, and hence color of the complex, were determined by single-crystal X-ray analysis, allowing fine tuning by crystal engineering.

    2. Functional Fluorophores

      Cruciform-Silica Hybrid Materials (pages 262–269)

      Anthony J. Zucchero, Rebecca A. Shiels, Psaras L. McGrier, M. Alicia To, Christopher W. Jones and Uwe H. F. Bunz

      Version of Record online: 12 NOV 2008 | DOI: 10.1002/asia.200800316

      Thumbnail image of graphical abstract

      Silica scaffolding: By employing functionalized mesoporous SBA-15 silica, novel fluorescent cruciform-silica hybrid materials are generated which preserve the desirable solution properties of cruciforms in the solid state for potential use in sensory schemes.

    3. Surfactochromicity

      Water Soluble Cruciforms: Effect of Surfactants on Fluorescence (pages 270–276)

      Juan Tolosa and Uwe H. F. Bunz

      Version of Record online: 15 DEC 2008 | DOI: 10.1002/asia.200800353

      Thumbnail image of graphical abstract

      Brighten up! Adding surfactants to aqueous solutions of three different water-soluble cruciforms (XF) improves their fluorescence quantum yields. Additionally, changes are observed in the emission wavelength of the XF around the critical micelle concentration (cmc) of the surfactant.

    4. Total Synthesis

      Total Synthesis of (−)- and (+)-Decarbamoyloxysaxitoxin and (+)-Saxitoxin (pages 277–285)

      Osamu Iwamoto, Ryoko Shinohara and Kazuo Nagasawa

      Version of Record online: 28 NOV 2008 | DOI: 10.1002/asia.200800382

      Thumbnail image of graphical abstract

      Playing the sax: The enantioselective total syntheses of (−)- and (+)-decarbamoyloxysaxitoxin (doSTX) and (+)-saxitoxin (STX) are reported. A new methodology was developed for the synthesis of STXs, featuring discriminative reduction of the nitro group and N[BOND]O bond in nitroisoxazolidine.

    5. Nanoparticles

      Preparation of Core-shell Magnetic Molecularly Imprinted Polymer Nanoparticles for Recognition of Bovine Hemoglobin (pages 286–293)

      Lin Li, Xiwen He, Langxing Chen and Yukui Zhang

      Version of Record online: 28 NOV 2008 | DOI: 10.1002/asia.200800300

      Thumbnail image of graphical abstract

      Imprinting nanoparticles: Core-shell bovine hemoglobin (BHb) imprinted magnetic nanoparticles (MNPs) with a mean diameter of 210 nm have been synthesized for the first time. The imprinted magnetic nanoparticles could easily reach the adsorption equilibrium and magnetic separation under an external magnetic field, thus avoiding problems related to the bulk polymer.

    6. Organic Thin Films

      Double Homologation Method for Substituted Soluble Pentacenes and Dimerization Behaviours of Pentacenes (pages 294–301)

      Shi Li, Zhiping Li, Kiyohiko Nakajima, Ken-ichiro Kanno and Tamotsu Takahashi

      Version of Record online: 15 DEC 2008 | DOI: 10.1002/asia.200800312

      Thumbnail image of graphical abstract

      Double up: A zirconium-mediated double homologation method was successfully applied for the synthesis of multi-substituted pentacene derivatives from 1,2,4,5-tetrakis(propargyl)benzenes. The bis(zirconacyclopentadiene) intermediates were also characterized. Among these symmetrical derivatives, tetra- and octa-substituted pentacenes undergo reversible conversion between monomeric and dimeric forms.

    7. Coordination Chemistry

      “Half-Bonds” in an Unusual Coordinated S42− Rectangle (pages 302–313)

      Anne Poduska, Roald Hoffmann, Andrea Ienco and Carlo Mealli

      Version of Record online: 13 NOV 2008 | DOI: 10.1002/asia.200800333

      Thumbnail image of graphical abstract

      Don′t be square! A rare S42− rectangle bridging two M2Cp22-CH2)2 (M=Rh, Ir) fragments is found to contain two “half-bonds” with S[BOND]S distances of 2.70 or 2.90 Å. Computational studies explore the connection between these “half-bonds” and a Jahn–Teller distortion, as well as possible intermediates that form M4S42+ clusters having the S42− rectangle rotated by 90°.

    8. Nitroaldol Reaction

      Synthesis, Structure, and Application of Self-Assembled Copper(II) Aqua Complex by H-Bonding for Acceleration of the Nitroaldol Reaction on Water (pages 314–320)

      Suribabu Jammi, Md Ashif Ali, Sekarpandi Sakthivel, Laxmidhar Rout and Tharmalingam Punniyamurthy

      Version of Record online: 10 NOV 2008 | DOI: 10.1002/asia.200800339

      Thumbnail image of graphical abstract

      Simple addition: Copper(II) aqua complex 1 can be prepared in a one-pot synthesis and is self-assembled by H-bond interactions. Complex 1 is shown to accelerate the nitroaldol reaction on water, which is a heterogeneous process, requiring no additive or base, and 1 can be recycled without loss of activity.

    9. Oxidative Addition

      Single and Double C[BOND]Cl-Activation of Methylene Chloride by P,N-ligand Coordinated Rhodium Complexes (pages 321–327)

      Benoît Blank, Germund Glatz and Rhett Kempe

      Version of Record online: 8 DEC 2008 | DOI: 10.1002/asia.200800359

      Thumbnail image of graphical abstract

      Two in one: The simultaneous formation of bimetallic μ-methylene bridged RhIII complexes as well as dimeric RhIII complexes with terminal chloromethyl groups is observed for P,N-ligand stabilized RhI complexes by C[BOND]Cl bond activation of methylene chloride. A mechanistic proposal for the formation of both activation products is also discussed.

    10. Total Synthesis

      Asymmetric Syntheses and Wnt Signal Inhibitory Activity of Melleumin A and Four Analogues of Melleumins A and B (pages 328–335)

      Jie-Min Luo, Chao-Feng Dai, Shu-Yong Lin and Pei-Qiang Huang

      Version of Record online: 12 DEC 2008 | DOI: 10.1002/asia.200800355

      Thumbnail image of graphical abstract

      Guided by nature: A flexible and epimerization-free approach for the asymmetric syntheses of melleumin A and four analogues of melleumins A and B was developed, which allowed confirming the stereochemistry at C-4 of melleumin A, and revealed that the unnatural 4-epi-melleumin B possesses a modest inhibitory activity on Wnt signaling.

  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. 3/2009 (page 339)

      Version of Record online: 26 JAN 2009 | DOI: 10.1002/asia.200990003

SEARCH

SEARCH BY CITATION