Kazuhiro Kimata

Kindai University

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Nobuo Tanaka

Tokyo Metropolitan University

Ken Hosoya

Kyoto Prefectural University

Takeo Araki

Tohoku University

Kimihiro Yoshizako

Amersham Hospital

Ken‐ichi Hosoya

Hokkaido University

Donald G. Patterson

Institute of Forensic Science

Tohru Ikegami

Kyoto Institute of Technology

Mikio Araki

Mitsubishi Electric (Japan)

Jean M. J. Fréchet

Lawrence Berkeley National Laboratory

Patricia C. McClure

Centers for Disease Control and Prevention

Cooperative Institutions

Kyoto Institute of Technology

Kyoto University

Centers for Disease Control and Prevention

The University of Tokyo

Tohoku University

Osaka University

National Center for Environmental Health

Shizuoka University

United States Department of Health and Human Services

Nagoya University

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Stereoselective Michael Addition of Organometallic Reagents to α,β-Unsaturated Ester Containing Oxazolidine Ring

Chemistry Letters (1990)

Hidemi Yoda Tsuyoshi Shirai Takao Katagiri Kunihiko Takabe Kazuhiro Kimata

Abstract Asymmetric conjugate addition of various organometallic reagents to chiral α,β-unsaturated ester derived from L-glutamic acid proceeded cleanly with almost complete diastereoface selection to furnish R-configurated adducts.

Oxazolidine

Michael reaction

10.1246/cl.1990.2037

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Citations (15)

Highly Diastereoselective 1,4-Addition of Amines to Chiral α,β-Unsaturated δ-Lactone

Chemistry Letters (1991)

Hidemi Yoda Tsuyoshi Shirai Tomoyasu Kawasaki Takao Katagiri Kunihiko Takabe

Abstract Michael addition of amines to (S)-γ-amino-α,β-unsaturated δ-lactone was accomplished in extremely high diastereoselectivity with the ring-opening reactions and was disclosed to furnish (3R,4S)-diamino-hydroxyamides in high yields.

10.1246/cl.1991.793

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Citations (9)

Stationary phase structures enhancing electroosmotic flow in capillary electrochromatography

Journal of Chromatography A (2000)

Tetsuya Tanigawa Terumichi Nakagawa Kazuhiro Kimata Hisashi Nagayama Ken Hosoya

Octadecyltrichlorosilane

Electrochromatography

10.1016/s0021-9673(00)00468-4

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Citations (8)

Special Articles: Environmental Sciences and Analytical Chemistry. Concentration and continuous photodecomposition of dioxins using an immobilized hydrophobic monolayer.

BUNSEKI KAGAKU (1994)

Ken Hosoya Kazuhiro Kimata Nobuo Tanaka D.G.Patterson Jr.

多孔性シリカゲル表面に固定化された疎水性単分子層に保持されたテトラクロロジベンゾ-p-ダイオキシンの紫外線ランプによる光分解反応を検討した.その結果,1, 2, 3, 4-テトラクロロダイオキシンは均一溶液中での反応と比較して速度は小さいものの光分解を受けることが明らかとなった.又,通常固体表面上での光分解反応が遅いことが報告されている2, 3, 7, 8-テトラクロロダイオキシンも極めて迅速に光分解を受けることが明らかとなり,これらの反応は太陽光でも進行することが確認された.更に,水系溶媒中に希薄な濃度で存在するダイオキシンをクロマトグラフィーの原理で固定化単分子層に濃縮し,これに直接光照射を行うことで連続的な光分解を試みた.この結果,ダイオキシンは有効に疎水性単分子層に濃縮され,紫外線ランプによるダイオキシンの光分解も迅速に進行し,連続的に濃縮と光分解を行うことが可能であることが示された.更に,生成物の分析により,固定化単分子層での光分解では,いずれの場合も最初に2位の塩素原子の脱離による1, 2, 4-トリクロロダイオキシンの生成が認められるものの,更にダイオキシン環の開裂を伴い,カテコール類,あるいはフェノール類にまで分解が進行しているという知見が得られた.

10.2116/bunsekikagaku.43.977

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ChemInform Abstract: Separation of Nitrogen Isotopic Compounds by Reversed‐Phase Liquid Chromatography on the Basis of Nitrogen Isotope Effects on the Dissociation of Amines.

Chemischer Informationsdienst (1986)

Nobuo Tanaka Atsumi Yamaguchi Mikio Araki Kazuhiro Kimata

Abstract The two isotopic anilines Ph‐′SNHZ and Ph‐,MNH; were completely separated by ionization control in RPLC.

Isotopes of nitrogen

Liquid phase

10.1002/chin.198613070

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Preparation and chromatographic properties of uniform size cross-linked macroporous poly(vinyl p-tert.-butylbenzoate) beads

Journal of Chromatography A (1994)

Ken Hosoya Etsuko Sawada Kazuhiro Kimata Takeo Araki Nobuo Tanaka

Divinylbenzene

10.1016/0021-9673(94)85293-6

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An Unexpected Molecular Imprinting Effect for a Polyaromatic Hydrocarbon, Anthracene, Using Uniform Size Ethylene Dimethacrylate Particles

Journal of High Resolution Chromatography (1999)

Ken Hosoya Yoshiyuki Iwakoshi Kimihiro Yoshizako Kazuhiro Kimata Nobuo Tanaka

A non-covalent type of molecular imprinting effect toward a polyaromatic hydrocarbon (PAH), viz. anthracene, was studied utilizing uniformly sized ethylene dimethacrylate (EDMA) polymer particles without functional host monomers. Although polymerization at 0°C initiated by a redox initiation system was expected to afford larger molecular imprinting effect due to stronger and more effective intermolecular interaction between the template and surface functional groups of the polymer, almost no imprinting effect was observed, while a much higher polymerization temperature of 70°C unexpectedly afforded a larger molecular imprinting effect for the template anthracene. In order to determine the unexpected imprinting effects observed, uniformly sized, macroporous un-imprinting EDMA polymer particles (base particles) were prepared by various polymerization techniques at different polymerization temperature as well as with different initiation systems. The careful studies proved that each kind of base polymer particle showed different molecular recognition ability, especially toward anthracene, which is depends upon the physical properties of each kind of base polymer particle. On the basis of these facts, we would propose that the potential molecular recognition ability of the un-imprinted base polymer particles is another important factor for realization of effective molecular imprinting alongside the factors reported previously.

Molecular imprinting

Imprinting (psychology)

Molecularly imprinted polymer

Molecular Recognition

10.1002/(sici)1521-4168(19990501)22:5<256::aid-jhrc256>3.0.co;2-b

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Citations (28)

Liquid Membrane Transport of Heavier Rare Earth Metal Ions Based on CPC Results with Di(2-Ethylhexyl) Phosphoric Acid

Journal of Liquid Chromatography (1990)

Takeo Araki Hideaki Asai Nobuo Tanaka Kazuhiro Kimata Ken Hosoya

Abstract The behaviors of heavier rare earth metal ions in bulk liquid membrane transport systems were examined for Gd3+, Tb3+, Dy3, Ho3+, Er3+, Tm3, Yb3+ and Lu3+ ions. The liquid membrane transport system was constructed by aq. HCl/CHCl3 containing Di (2-ethylhexyl) phosphoric acid/aq. HCl. The optimum concentration of HCl in the aqueous phase with respect to the rate of transport for these ions increased with the atomic number of the rare earth elements. This trend of transport behaviors was on the same line observed for lighter rare earth ions in the preceding work. Difference in the rate of transport can be used for selective liquid membrane transport of several sets of combination with these ions.

Phosphoric acid

10.1080/01483919008049564

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Citations (2)

Polyallamine-supported pseudo-stationary phases for electrokinetic chromatography Effect of alkyl chain length of the pseudo-stationary phase and methanol content of aqueous buffer on the separation of hydrophobic compounds

Journal of Chromatography A (1997)

Nobuo Tanaka K. NAKAGAWA Hironobu Iwasaki Ken‐ichi Hosoya Kazuhiro Kimata

10.1016/s0021-9673(97)00638-9

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Citations (39)

Selectivity of stationary phases in reversed-phase liquid chromatography based on the dispersion interactions

Journal of Chromatography A (2001)

Maciej Turowski Takashi Morimoto Kazuhiro Kimata Hiroshi Monde Tohru Ikegami

10.1016/s0021-9673(00)01193-6

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Citations (56)