The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Takeo Taguchi - One of the best experts on this subject based on the ideXlab platform.
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stereoselective Iodine Atom transfer 3 2 cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals
ChemInform, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Stereoselective Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals.
The Journal of organic chemistry, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Iodine Atom transfer 3 2 cycloaddition reaction with electron rich alkenes using n tosyliodoaziridine derivatives as novel azahomoallyl radical precursors
ChemInform, 2003Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Yoichiro Yamada, Hiroki Fujiwara, Takeo TaguchiAbstract:Treatment of N-tosyliodoaziridine derivatives with Et3B efficiently produces various azahomoallyl radical (2-akenylamidyl radical) species which give oxygen-functionalized pyrrolidine derivatives through Iodine Atom transfer [3 + 2] cycloaddition with electron-rich alkenes such as enol ethers and ketene acetal. The present cycloaddition reaction proceeds regioselectively via C−N bond cleavage of an aziridinylalkyl radical intermediate and addition of the resulting azahomoallyl radicals to the terminal carbon of an alkene. The reaction of alkenes with the cyclohexenylamidyl radical generated from an optically active bicyclic iodoaziridine [(1S,2S,6S)-2-iodo-7-(p-toluenesulfonyl)-7-azabicyclo[4.1.0]heptane, 94% ee] also proceeds to give optically active octahydroindole derivatives (84−93% ee).
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Radical [3 + 2] cycloaddition reaction with various alkenes using iodomethylcyclopropane derivatives as new homoallyl radical precursors.
The Journal of organic chemistry, 2002Co-Authors: Osamu Kitagawa, Yoichiro Yamada, Hiroki Fujiwara, Takeo TaguchiAbstract:Radical Iodine Atom transfer [3 + 2] cycloaddition with various alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate and 1,1-bis(phenylsulfonyl)-2-(iodomethyl)cyclopropane as new precursors of a homoallyl radical species smoothly proceeds to give functionalized cyclopentane derivatives in good yields.
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Radical [3+2]-cycloaddition reaction with alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate as a new homoallyl radical precursor
Tetrahedron Letters, 2001Co-Authors: Osamu Kitagawa, Hiroki Fujiwara, Takeo TaguchiAbstract:Abstract Radical Iodine Atom transfer [3+2]-cycloaddition with various alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate as a new precursor of homoallyl radical species smoothly proceeds to give functionalized cyclopentane derivatives in good yields.
Osamu Kitagawa - One of the best experts on this subject based on the ideXlab platform.
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stereoselective Iodine Atom transfer 3 2 cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals
ChemInform, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Stereoselective Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals.
The Journal of organic chemistry, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Iodine Atom transfer 3 2 cycloaddition reaction with electron rich alkenes using n tosyliodoaziridine derivatives as novel azahomoallyl radical precursors
ChemInform, 2003Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Yoichiro Yamada, Hiroki Fujiwara, Takeo TaguchiAbstract:Treatment of N-tosyliodoaziridine derivatives with Et3B efficiently produces various azahomoallyl radical (2-akenylamidyl radical) species which give oxygen-functionalized pyrrolidine derivatives through Iodine Atom transfer [3 + 2] cycloaddition with electron-rich alkenes such as enol ethers and ketene acetal. The present cycloaddition reaction proceeds regioselectively via C−N bond cleavage of an aziridinylalkyl radical intermediate and addition of the resulting azahomoallyl radicals to the terminal carbon of an alkene. The reaction of alkenes with the cyclohexenylamidyl radical generated from an optically active bicyclic iodoaziridine [(1S,2S,6S)-2-iodo-7-(p-toluenesulfonyl)-7-azabicyclo[4.1.0]heptane, 94% ee] also proceeds to give optically active octahydroindole derivatives (84−93% ee).
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Radical [3 + 2] cycloaddition reaction with various alkenes using iodomethylcyclopropane derivatives as new homoallyl radical precursors.
The Journal of organic chemistry, 2002Co-Authors: Osamu Kitagawa, Yoichiro Yamada, Hiroki Fujiwara, Takeo TaguchiAbstract:Radical Iodine Atom transfer [3 + 2] cycloaddition with various alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate and 1,1-bis(phenylsulfonyl)-2-(iodomethyl)cyclopropane as new precursors of a homoallyl radical species smoothly proceeds to give functionalized cyclopentane derivatives in good yields.
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Radical [3+2]-cycloaddition reaction with alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate as a new homoallyl radical precursor
Tetrahedron Letters, 2001Co-Authors: Osamu Kitagawa, Hiroki Fujiwara, Takeo TaguchiAbstract:Abstract Radical Iodine Atom transfer [3+2]-cycloaddition with various alkenes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate as a new precursor of homoallyl radical species smoothly proceeds to give functionalized cyclopentane derivatives in good yields.
Shizhang Qiao - One of the best experts on this subject based on the ideXlab platform.
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non metal single Iodine Atom electrocatalysts for the hydrogen evolution reaction
Angewandte Chemie, 2019Co-Authors: Yongqiang Zhao, Tao Ling, Shuangming Chen, Bo Jin, Anthony Vasileff, Yan Jiao, Li Song, Jun Luo, Shizhang QiaoAbstract:Common-metal-based single-Atom catalysts (SACs) are quite difficult to design due to the complex synthesis processes required. Herein, we report a single-Atom nickel iodide (SANi-I) electrocatalyst with Atomically dispersed non-metal Iodine Atoms. The SANi-I is prepared via a simple calcination step in a vacuum-sealed ampoule and subsequent cyclic voltammetry activation. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and synchrotron-based X-ray absorption spectroscopy are applied to confirm the Atomic-level dispersion of Iodine Atoms and detailed structure of SANi-I. Single Iodine Atoms are found to be isolated by oxygen Atoms. The SANi-I is structural stable and shows exceptional electrocatalytic activity for the hydrogen evolution reaction (HER). In situ Raman spectroscopy reveals that the hydrogen adAtom (Hads ) is adsorbed by a single Iodine Atom, forming the I-Hads intermediate, which promotes the HER process.
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Non‐metal Single‐Iodine‐Atom Electrocatalysts for the Hydrogen Evolution Reaction
Angewandte Chemie (International ed. in English), 2019Co-Authors: Yongqiang Zhao, Tao Ling, Shuangming Chen, Bo Jin, Anthony Vasileff, Yan Jiao, Li Song, Jun Luo, Shizhang QiaoAbstract:Common-metal-based single-Atom catalysts (SACs) are quite difficult to design due to the complex synthesis processes required. Herein, we report a single-Atom nickel iodide (SANi-I) electrocatalyst with Atomically dispersed non-metal Iodine Atoms. The SANi-I is prepared via a simple calcination step in a vacuum-sealed ampoule and subsequent cyclic voltammetry activation. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and synchrotron-based X-ray absorption spectroscopy are applied to confirm the Atomic-level dispersion of Iodine Atoms and detailed structure of SANi-I. Single Iodine Atoms are found to be isolated by oxygen Atoms. The SANi-I is structural stable and shows exceptional electrocatalytic activity for the hydrogen evolution reaction (HER). In situ Raman spectroscopy reveals that the hydrogen adAtom (Hads ) is adsorbed by a single Iodine Atom, forming the I-Hads intermediate, which promotes the HER process.
Tadamasa Shida - One of the best experts on this subject based on the ideXlab platform.
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the 2p1 2 2p3 2 transition of the Iodine Atom photoproduced from alkyl iodides in solid parahydrogen detection of new absorptions
Chemical Physics Letters, 2002Co-Authors: Mizuho Fushitani, Takamasa Momose, Tadamasa ShidaAbstract:Abstract Alkyl iodides were photolyzed in solid parahydrogen at about 5 K. The first photolysis with 253.7 nm photons yielded two products by reactions, RI +hν (253.7 nm )→ R free + I free and ( R – I ), the latter being a complex between the radical R and the Iodine Atom I . Subsequent photolysis with 193 nm photons activated the radical moiety in both products to induce a reaction, R + H 2 +hν (193 nm )→ RH + H , which gave the products RH free and (RH– I ). The radical R and the alkane RH were characterized by the mid-IR absorption while the Iodine Atoms in I free , and ( R – I ) and (RH– I ) were identified by the near IR absorption of the magnetic dipole transition of the Atom.
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The 2P1/2←2P3/2 transition of the Iodine Atom photoproduced from alkyl iodides in solid parahydrogen: detection of new absorptions
Chemical Physics Letters, 2002Co-Authors: Mizuho Fushitani, Takamasa Momose, Tadamasa ShidaAbstract:Abstract Alkyl iodides were photolyzed in solid parahydrogen at about 5 K. The first photolysis with 253.7 nm photons yielded two products by reactions, RI +hν (253.7 nm )→ R free + I free and ( R – I ), the latter being a complex between the radical R and the Iodine Atom I . Subsequent photolysis with 193 nm photons activated the radical moiety in both products to induce a reaction, R + H 2 +hν (193 nm )→ RH + H , which gave the products RH free and (RH– I ). The radical R and the alkane RH were characterized by the mid-IR absorption while the Iodine Atoms in I free , and ( R – I ) and (RH– I ) were identified by the near IR absorption of the magnetic dipole transition of the Atom.
Shinsaku Miyaji - One of the best experts on this subject based on the ideXlab platform.
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stereoselective Iodine Atom transfer 3 2 cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals
ChemInform, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Stereoselective Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes using unsymmetrical allylated active methine radicals.
The Journal of organic chemistry, 2004Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Chiseko Sakuma, Takeo TaguchiAbstract:Treatment of 1-diethylphosphonyl- or 1-phenylsulfonyl-2-(iodomethyl)cyclopropane-1-carboxylate with Et(3)B leads to an unsymmetrical allylated active methine radical species that gives functionalized cyclopentane derivatives with high stereoselectivity through Iodine Atom transfer [3 + 2] cycloaddition reaction with alkenes.
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Iodine Atom transfer 3 2 cycloaddition reaction with electron rich alkenes using n tosyliodoaziridine derivatives as novel azahomoallyl radical precursors
ChemInform, 2003Co-Authors: Osamu Kitagawa, Shinsaku Miyaji, Yoichiro Yamada, Hiroki Fujiwara, Takeo TaguchiAbstract:Treatment of N-tosyliodoaziridine derivatives with Et3B efficiently produces various azahomoallyl radical (2-akenylamidyl radical) species which give oxygen-functionalized pyrrolidine derivatives through Iodine Atom transfer [3 + 2] cycloaddition with electron-rich alkenes such as enol ethers and ketene acetal. The present cycloaddition reaction proceeds regioselectively via C−N bond cleavage of an aziridinylalkyl radical intermediate and addition of the resulting azahomoallyl radicals to the terminal carbon of an alkene. The reaction of alkenes with the cyclohexenylamidyl radical generated from an optically active bicyclic iodoaziridine [(1S,2S,6S)-2-iodo-7-(p-toluenesulfonyl)-7-azabicyclo[4.1.0]heptane, 94% ee] also proceeds to give optically active octahydroindole derivatives (84−93% ee).
