Chemistry – An Asian Journal

Cover image for Vol. 4 Issue 11

November 2, 2009

Volume 4, Issue 11

Pages 1633–1755

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
    7. Full Papers
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    1. Cover Picture: Cobalt Antiferromagnetic Ring and Grid Single-Molecule Magnet (Chem. Asian J. 11/2009) (page 1633)

      Takuya Shiga, Takuto Matsumoto, Mao Noguchi, Tatsuya Onuki, Norihisa Hoshino, Graham N. Newton, Motohiro Nakano and Hiroki Oshio

      Version of Record online: 28 OCT 2009 | DOI: 10.1002/asia.200990037

      Thumbnail image of graphical abstract

      Polynuclear metal complexes are known to have magnetic properties characteristic of their molecular shapes and crystal structures. H. Oshio et al. synthesize a Co8 ring and a Co9 grid complex using a multidentate polypyridine-type ligand which are shown to exhibit all antiferromagnetic interactions between metal centers, with the grid complex displaying SMM properties as a result of alternating high spin/low spin metal centers in the outer 8-membered ring. Few cobalt-based SMMs are known in spite of the fact that cobalt ions can display substantial magnetic anisotropy. For further details, turn to their Communication on page 1660 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
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    1. Photoluminescence

      Chemistry as a Prism: A Review of Light-Emitting Materials Having Tunable Emission Wavelengths (pages 1646–1658)

      Eunha Kim and Seung Bum Park

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/asia.200900102

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      Lighten up! Photoluminescent materials have been extensively applied in various fields of science because of their attractive characteristics, such as excellent sensitivity, good specificity, a large linear range of analysis, ease of handling, and so on. In this article, we review recent progress in the tuning of the photophysical properties of fluorescent and phosphorescent materials, focusing especially on the tunability of their emission properties.

  5. Communications

    1. Top of page
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    3. Graphical Abstract
    4. News
    5. Focus Review
    6. Communications
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    1. Single-Molecule Magnets

      Cobalt Antiferromagnetic Ring and Grid Single-Molecule Magnet (pages 1660–1663)

      Takuya Shiga, Takuto Matsumoto, Mao Noguchi, Tatsuya Onuki, Norihisa Hoshino, Graham N. Newton, Motohiro Nakano and Hiroki Oshio

      Version of Record online: 17 JUL 2009 | DOI: 10.1002/asia.200900216

      Thumbnail image of graphical abstract

      Grid magnet: A Co8 ring and a Co9 grid complex are synthesized using a multidentate polypyridine-type ligand and are shown to exhibit all antiferromagnetic interactions between metal centers, with the grid complex displaying SMM properties as a result of alternating high spin/low spin metal centers in the outer 8-membered ring.

    2. Aldol Reactions

      Organocatalytic Enantioselective Cross-Aldol Reactions of Aldehydes with Isatins: Formation of Two Contiguous Quaternary Centered 3-Substituted 3-Hydroxyindol-2-ones (pages 1664–1667)

      Fei Xue, Shilei Zhang, Lu Liu, Wenhu Duan and Wei Wang

      Version of Record online: 11 SEP 2009 | DOI: 10.1002/asia.200900243

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      Good neighbors: Cross-aldol reactions of isatins with aldehydes, catalyzed by (S)-pyrrolidine tetrazole are developed. In the process, two contiguous quaternary centers and one chiral carbon are created simultaneously with good efficiency.

    3. Cyclization

      Dichotomous Control of E/Z-Geometry in Intramolecular Cyclization of o-Alkynylbenzamide Derivatives Catalyzed by Organic Superbase P4-tBu in the Presence/Absence of Water (pages 1668–1672)

      Chikashi Kanazawa and Masahiro Terada

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/asia.200900342

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      E/Zdoes it! An intramolecular cyclization reaction of o-alkynylbenzamides that allows dichotomous control of E/Z-geometry has been developed using an organic superbase, P4-tBu, as a catalyst. The presence/absence of water along with the use of an organic superbase provides the necessary control of the geometry at the exo-double bond. The method enables efficient access to isoindolinone derivatives, an important class of biologically active molecules.

    4. Phase Transitions

      Pressure-Induced Consecutive Phase Transitions of a Metallic MMX-Chain Complex, Pt2(dtp)4I (dtp: C2H5CS2) (pages 1673–1676)

      Kazuya Otsubo, Atsushi Kobayashi, Masato Hedo, Yoshiya Uwatoko and Hiroshi Kitagawa

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/asia.200900340

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      Under pressure: Raman spectra clearly reveal the signs of the electronic states. Raman spectroscopic studies on a metallic MMX-chain complex, Pt2(dtp)4I, under high pressure reveal that its electronic state changes with pressure as follows; AV ([BOND]Pt2.5+[BOND]Pt2.5+[BOND]I[BOND]) and CP (⋅⋅⋅Pt2+[BOND]Pt3+[BOND]I⋅⋅⋅) states (below 1.0 GPa), AV state (1.0–3.0 GPa), and CP state (above 3.0 GPa).

  6. Full Papers

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    3. Graphical Abstract
    4. News
    5. Focus Review
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    1. Charge Transfer

      Phthalocyanine–C60 Fused Conjugates Exhibiting Molecular Orbital Interactions Depending on the Solvent Polarity (pages 1678–1686)

      Takamitsu Fukuda, Naoaki Hashimoto, Yasuyuki Araki, Mohamed E. El-Khouly, Osamu Ito and Nagao Kobayashi

      Version of Record online: 28 OCT 2009 | DOI: 10.1002/asia.200900241

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      Environmental changes! Novel covalently C60-connected phthalocyanine (Pc) derivatives have been synthesized by utilizing successive cycloaddition reactions of C60 with a Pc derivative, which show significant MO interactions between Pc and C60. Spectroscopic and electrochemical studies reveal that the LUMO of the conjugate localizes on either Pc or C60, depending on the solvent polarity.

    2. Supramolecular Chemistry

      Reversible Mechanical Induction of Optical Activity in Solutions of Soft-Matter Nanophases (pages 1687–1696)

      Oriol Arteaga, Carlos Escudero, Gerard Oncins, Zoubir El-Hachemi, Joan Llorens, Joaquim Crusats, Adolf Canillas and Josep M. Ribó

      Version of Record online: 29 SEP 2009 | DOI: 10.1002/asia.200900254

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      Let's fold again! J-aggregates of several achiral amphiphilic porphyrins, which are ordered as long acicular thin nanoparticles, show the immediate and reversible formation of a stationary mechano-chiral state in the solution by vortex stirring, as detected by their circular dichroic signals measured by 2-modulator generallized ellipsometry.

    3. Fluorescent Sensors

      Benzenesulfonamidoquinolino-β-cyclodextrin as a Cell-Impermeable Fluorescent Sensor for Zn2+ (pages 1697–1702)

      Ning Zhang, Yong Chen, Miao Yu and Yu Liu

      Version of Record online: 15 SEP 2009 | DOI: 10.1002/asia.200900233

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      In love with zinc! A benzenesulfonamidoquinolino-β-cyclodextrin has been synthesized as a cell-impermeable fluorescent sensor for Zn2+. The compound exhibits specific fluorescence in the presence of Zn2+-containing damaged cells. In the damaged cells, the junction gap in the cell membrane increased, which allowed the compound to anchor on the cell membrane.

    4. Metallofullerenes

      The Cage and Metal Effect: Spectroscopy and Electrochemical Survey of a Series of Sm-Containing High Metallofullerenes (pages 1703–1711)

      Jia Liu, Zujin Shi and Zhennan Gu

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/asia.200900234

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      Trapped in a cage: A series of Sm-containing high metallofullerenes is characterized by cyclic and differential pulse voltammograms. The cage and metal effect on electronic structural features of these metallofullerenes is discussed through a comparison of the electrochemical behavior of other divalent metallofullerenes and corresponding fullerenes.

    5. Organocatalysis

      Direct Oxidation of β-Aryl Substituted Aldehydes to α,β-Unsaturated Aldehydes Promoted by an o-Anisidine–Pd(OAc)2 Co-catalyst (pages 1712–1716)

      Jie Liu, Jin Zhu, Hualiang Jiang, Wei Wang and Jian Li

      Version of Record online: 11 SEP 2009 | DOI: 10.1002/asia.200900238

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      Pd directs the way: An o-anisidine–Pd(OAc)2 catalytic system has been developed for the direct co-catalytic Saegusa oxidation of β-aryl substituted aldehydes to α,β-unsaturated aldehydes. The use of o-anisidine in place of the usual (S)-diphenylprolinol makes the process simpler and more cost-effective.

    6. Rare Earth Chemistry

      Mono-, Di-, Tri- and Tetranuclear Rare Earth Complexes Obtained Using a Moderately Bulky Aryloxide Ligand (pages 1717–1728)

      Glen B. Deacon, Peter C. Junk and Graeme J. Moxey

      Version of Record online: 14 OCT 2009 | DOI: 10.1002/asia.200900269

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      Medium rare? Redox transmetallation ligand exchange reactions investigated, involving a rare earth metal, 2,4,6-trimethylphenol (HOmes), and a diarylmercurial, afford a wide variety of rare earth aryloxo complexes, which are crystallographically characterized.

    7. Cyclization

      Benzo[b]phosphole-Containing π-Electron Systems: Synthesis Based on an Intramolecular trans-Halophosphanylation and Some Insights into Their Properties (pages 1729–1740)

      Aiko Fukazawa, Yasunori Ichihashi, Youhei Kosaka and Shigehiro Yamaguchi

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/asia.200900303

      Thumbnail image of graphical abstract

      The PX key: Intramolecular trans-halophosphanylation of 2-(aminophosphanyl)phenylacetylenes mediated by PBr3 followed by oxidation, produce the 3-bromobenzo[b]phosphole oxide derivatives. On the basis of this synthetic method, various benzophosphole-containing π-conjugated compounds are synthesized.

    8. Enantioselective Protonation

      Enantioselective Protonation of Itaconimides with Thiols and the Rotational Kinetics of the Axially Chiral C[BOND]N Bond (pages 1741–1744)

      Shishi Lin, Dasheng Leow, Kuo-Wei Huang and Choon-Hong Tan

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/asia.200900331

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      Chiral cycles: Chiral bicyclic guanidine is found to catalyze the tandem conjugate addition–enantioselective protonation of N-substituted itaconimides with thiols. Adducts are obtained in excellent yields and good ees. N-Phenylitaconimides, with a large ortho substitutent, have a significant barrier to rotation about the C–N axis and exist as atropisomers. The kinetic and thermodynamic parameters of the rotational barrier in these axially chiral itaconimides are studied.

    9. Stable Carbenes

      Reactivity of Cyclic (Alkyl)(amino)carbenes (CAACs) and Bis(amino)cyclopropenylidenes (BACs) with Heteroallenes: Comparisons with their N-Heterocyclic Carbene (NHCs) Counterparts (pages 1745–1750)

      Glenn Kuchenbeiser, Michele Soleilhavoup, Bruno Donnadieu and Guy Bertrand

      Version of Record online: 24 SEP 2009 | DOI: 10.1002/asia.200900338

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      The same but different: Nowadays, several types of stable carbenes are available, and their electronic and steric properties vary substantially, as exemplified here. Indeed, a broad palatte of products is observed upon reaction with heteroallenes depending on whether NHCs, CAACs, or BACs are employed. Although appealing, the use of IR spectroscopy to rank the σ-donor strength of carbenes reveals limitations in the traditional LM(CO)2Cl and recently proposed LCO2 methodologies.

  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. You have free access to this content
      Preview: Chem. Asian J. 12/2009 (page 1755)

      Version of Record online: 28 OCT 2009 | DOI: 10.1002/asia.200990040

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