Kobunshi
Online ISSN : 2185-9825
Print ISSN : 0454-1138
ISSN-L : 0454-1138
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Volume 57, Issue 3
Displaying 1-15 of 15 articles from this issue
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  • [title in Japanese]
    2008 Volume 57 Issue 3 Pages 126-128
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.126
    JOURNAL FREE ACCESS
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  • Great Expectations: Synthetic Organic Chemists Aim for New Functional Polymers
    Kohei TAMAO
    2008 Volume 57 Issue 3 Pages 129
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.129
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  • “Synthetic Organic Chemistry” and “Polymer Science” of Isocyanide
    Michinori SUGINOME
    2008 Volume 57 Issue 3 Pages 130-133
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.130
    JOURNAL FREE ACCESS
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    Unique reactivity of isocyanides has been a major research subject both in polymer science and organic chemistry, leading to the development of transition metal-mediated polymerization, which gives rise to the formation of helical poly(iminomethylene)s, and various synthetically useful transformations such as Ugi reaction. The reactivity of isocyanide was successfully extended to aromatizing polymerization of o-diisocyanibenzenes, giving rise to the formation of poly(quinoxaline-2, 3-diyl)s, which adopt stable helical structure. Selective synthesis of optically active poly(quinoxaline-2, 3-diyl)s via asymmetric living polymerization and the possibility of their application to asymmetric organic synthesis are described.
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  • Catalytic Direct Functionalization of Olefins, Aromatics, and Fullerenes
    Kenichiro ITAMI
    2008 Volume 57 Issue 3 Pages 134-137
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.134
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    A number of catalytic methods that efficiently functionalize carbon unsaturated molecules, such as olefins, aromatics, and fullerenes, have been developed. The palladium-catalyzed C-H bond arylation of vinylelement compounds (CH2=CHE; E=Si, B, S)opened a way to make multisubstituted olefins in a programmable and diversity-oriented format. The rhodium-catalyzed C-H bond arylation of arenes and heteroarenes allows a rapid synthesis of privileged biaryl molecules. Functionalized fullerenes can be created by a new organoboron-based arylation and alkenylation of fullerene with the aid of rhodium catalyst.
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  • Precision Synthesis of Aromatic Polymers by Transition Metal Complex Catalysts
    Hideyuki HIGASHIMURA
    2008 Volume 57 Issue 3 Pages 138-141
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.138
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    Precision synthesis of aromatic polymers by transition metal catalysts has greatly progressed. Oxidative polymerization of phenolic monomers has been recently reconsidered as a clean synthetic method. The regioselectivity for the polymerization of 2and/or 6-unsubstituted phenols can be controlled by a radical-controlled catalyst, a catalyst immobilized on mesoporous materials, and so on. The asymmetric oxidative coupling polymerization of naphthol derivatives by a chiral catalyst is also found. The C-C cross coupling such as Kumada-Tamao type and Suzuki-Miyaura type has been actively applied to a polymerization method. Not only the head-to-tail selectivity is regulated, but also molecular weight distribution is controlled via catalyst transfer polycondensation.
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  • Environmentally Benign Organic Synthesis Using Chiral Organocatalysts
    Keiji MARUOKA
    2008 Volume 57 Issue 3 Pages 142-145
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.142
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    Various types of new catalytic asymmetric reactions (i. e., asymmetric alkylation, aldol reaction, conjugate addition, Mannich reaction, etc. ) have been developed in an environmentally benign manner based on the rational design of chiral phase transfer catalysts, chiral bifunctional sulfonamide amino catalysts, and chiral binaphthyl dicarboxylic acids as efficient chiral organocatalysts, starting from commercially available optically pure binaphthols.
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  • Synthesis and Functionalities of Silicon-π-Electron System Alternate Polymers
    Joji OHSHITA
    2008 Volume 57 Issue 3 Pages 146-149
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.146
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    Polymers composed of an alternate arrangement of anorganosilanylene and π-electron system have been extensively studied as novel functional materials. Enhanced conjugation by the interaction between siliconσ-andπ-orbitals has been often noted in these polymers. In addition, introduction of the silicon linkage is expected to give rise to the photoactivity of the polymers and improve their solubility. ln this review, recent progress concerning the synthesis and functionalities of the Si-πalternate polymers is introduced. Poly(silylenephenylene)s bearing fluorophores as the pendant groups were reported p toh oteoxluhmibiinte shceignhcley properties even in the solid state. Exposure of the films toward UV irradiation in air led to the rapid decrease of the PL intensity of the films, being applicable to patterning of the PL images. It has been demonstrated that efficient energy transfer as well as electron transfer between the π-electron system occurs in the photoexcited states of the Si-πpolymers, indicating the potential utility of the polymers as photo harvesting materials. These kinds of the polymers have been also examined as emissive as well as carrier transporting materials for the use in electroluminescence (EL) devices.
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  • Ladder π-Electron Materials with Main Group Elements
    Shigehiro YAMAGUCHI
    2008 Volume 57 Issue 3 Pages 150-153
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.150
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    The progress in organic electronics highly relies on the development of new excellent π-conjugated materials. ln this regard, ladder-type π-conjugated frameworks are promising building units, wherein the enhanced π-conjugation by their rigid coplanar structures leads to a set of desirable properties such as intense fluorescence and high carrier mobility. An effective modulation of this class of materials is to incorporate group 13-16 elements, such as B, Si, P, S, and Se, into the ladder frameworks. Exploitation of the features of these elements, unique orbital interaction, varied coordination/valence numbers, and structural features, allows us to create new fascinating molecular systems. Recent progresses in this direction are summarized, in particular, focusing on the chemistry of ladder oligo(p-phenylenevinylene)s and fused oligothiophenes.
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  • Polyaddition and Polycondensation by Transition Metal Catalysis
    Atsunori MORI
    2008 Volume 57 Issue 3 Pages 154-157
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.154
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    Synthetic organic reactions that we developed recently are applied to polymer syntheses by polycondensation and polyaddition reactions. Recent remarkable progress in this field including transition metal-catalyzed cross-coupling and hydrosilylation is also introduced.
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  • [title in Japanese]
    2008 Volume 57 Issue 3 Pages 158
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.158
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2008 Volume 57 Issue 3 Pages 158a
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.158a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2008 Volume 57 Issue 3 Pages 158b
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.158b
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2008 Volume 57 Issue 3 Pages 158c
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.158c
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  • New Development of Macromolecular Metal Complexes with Advanced Architecture
    Takane IMAOKA, Kimihisa YAMAMOTO
    2008 Volume 57 Issue 3 Pages 159-164
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.159
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    Innumerable macromolecular-metal complexes have been synthesized to develop the chemistry for catalysis, electronics and other materials. The structural variety is one of the significant advantages to use these materials. However, the structural definition is very difficult and far from the well-defined biological complexes called “metallo-protein”. Recent development on nano-fabrications with organic synthesis, self-assembly and other bottom-up methods would make great advance of these materials to the next stage. Metal complexes based on dendrimer architecture (metallo-dendrimers) are the best examples as artificial models to approach the metallo-protein. This review focuses on how we should design the metal-organic nano-architecture based on a dendrimer scaffold. Applications for new class of catalysts are also described.
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  • Charmed by the World not Visible
    Ken NAKAJIMA
    2008 Volume 57 Issue 3 Pages 165
    Published: March 01, 2008
    Released on J-STAGE: October 14, 2011
    DOIhttps://doi.org/10.1295/kobunshi.57.165
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    My first encounter with atomic force microscope through the polymer research in my school days was described. Atomic force microscope visualized nano-scopic world not visible by eye and charmed me quite a lot. My recent studies on a mechanical property measurement on a single polymer chain (nanofishing) are also motivated by this encounter.
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