高圧力の科学と技術
Online ISSN : 1348-1940
Print ISSN : 0917-639X
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11 巻 , 3 号
選択された号の論文の9件中1~9を表示しています
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特集 —低温高圧技術の進展と物性研究—
解説
  • 小槻 日吉三, 隈本 康司
    原稿種別: 解説
    専門分野: その他
    11 巻 (2001) 3 号 p. 220-226
    公開日: 2003/02/28
    ジャーナル フリー
    High pressure chemistry is now recognized as a powerful method to achieve synthetic organic reactions which are not readily accessible by usual means. This article deals with the recent developments made in this laboratory such as 1) epoxide ring-opening reactions, 2) Michael addition reaction, 3) nucleophilic aromatic substitution, and 4) several condensation reactions. The application of this technique to natural product synthesis, asymmetric synthesis, and the molecular design of new functional materials is also discussed.
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  • 金田 真幸, 和田 健彦, 井上 佳久
    原稿種別: 解説
    専門分野: その他
    11 巻 (2001) 3 号 p. 227-233
    公開日: 2003/02/28
    ジャーナル フリー
    Pressure effects upon asymmetric photochemical reactions are discussed in the context of entropy control of these reactions. In the enantiodifferentiating photoisomerization of (Z)-cyclooctene (1Z) to chiral (E)-isomer (1E) sensitized by chiral aromatic esters (2-7), the 1E/1Z ratio and the enantiomeric excess (ee) of 1E are critical finctions of the applied pressure, accompanying an unprecedented switching of the product chirality. Furthermore the differential activation parameters (ΔΔH, ΔΔS and ΔΔV) obtained by changing pressure and temperature cleary indicate that these variants act as independent factors in the enantiodifferentiating process. This opens a new channel to the multidimensional control of not only asymmetric photochemical but also conventional thermo/photo/biochemical reactions in which weak interactions are the principal driving force or determining factor.
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  • 長尾 道弘, 瀬戸 秀紀
    原稿種別: 解説
    専門分野: その他
    11 巻 (2001) 3 号 p. 234-241
    公開日: 2003/02/28
    ジャーナル フリー
    The effects of temperature and pressure on the structural formations in a ternary microemulsion system were reviewed. From the static measurement by means of a small angle x-ray and neutron scattering, similar phase transitions with increasing temperature or pressure were observed. Introducing a normalized temperature and pressure, the similarity and dissimilarity of those two phase transitions were clarified. From the dynamic measurement utilizing neutron spin echo, it was demonstrated that the membrane dynamics at the high-pressure phase were completely different from the high temperature phase. These differences suggest differing mechanisms for the pressure-induced phase transition and the temperature-induced transition.
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