Zobrazeno 1 - 10 of 15 pro vyhledávání: '"Koichi Koga"'
3
Convenient and useful synthesis ofN-carboxyanhydride monomers through selective cyclization of urethane derivatives of α-amino acids
Autor: Atsushi Sudo, Takeshi Endo, Haruo Nishida, Koichi Koga
Publikováno v: Journal of Polymer Science Part A: Polymer Chemistry. 47:3839-3844
A new convenient synthesis of N-carboxyanhydrides (NCAs) of α-amino acids was achieved by selective cyclization of urethane derivatives of α-amino acids. The urethanes were readily synthesized via N-carbamoylation of α-amino acids by bis(4-nitroph
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3142c8b400883a42dae06e9c1fec8577
https://doi.org/10.1002/pola.23450
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5
Syntheses, structures, and reactivities of novel binuclear ruthenium(II) complexes with bis(μ-phosphinato) bridges
Autor: Tadashi Tokii, Masayuki Koikawa, Yasunori Yamada, Koichi Koga
Publikováno v: Journal of Coordination Chemistry. 60:143-151
Novel binuclear ruthenium(II) complexes with bis(μ-phosphinato-κO:κO′) bridges, [Ru(dpp)(bpy)2]2(BF4)2 (1), [Ru(bmp)(bpy)2]2(BF4)2 (2) (Hdpp = diphenylphosphinic acid, Hbmp = bis(4-methoxyphenyl)phosphinic acid, bpy = 2,2′-bipyridine), have be
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::956f7333eadc4a1ebe3752ef0c112b28
https://doi.org/10.1080/00958970600736637
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7
Palladium(II)-Catalyzed Oxidative Transformation of Allylic Alcohols and Vinyl Ethers into 2-Alkoxytetrahydrofurans: Catechol as an Activator of Catalyst
Autor: Koichi Koga, Takahiro Hosokawa, Yasufumi Kawamura, Kimi Minami
Publikováno v: Organic Letters. 7:5689-5692
[chemical reaction: see text]. A highly effective synthesis of 2-alkoxytetrahydrofurans from allylic alcohols and vinyl ethers was achieved by using catalytic amounts of Pd(OAc)2, Cu(OAc)2, and catechol (1:1:2) under O2. The use of catechol as an act
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4eafef688952247f73d725dda907da0
https://doi.org/10.1021/ol052377l
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8
Syntheses, magnetic properties, and reactivity of dinuclear oxovanadium (IV) and copper (II) complexes with (μ-diphenylphosphinato)-bridges
Autor: Koichi Koga, Masayuki Koikawa, Tadashi Tokii, Makiko Ueno
Publikováno v: Inorganic Chemistry Communications. 6:374-376
Novel dinuclear oxovanadium (IV) complexes having the formula [(VO)2(dpp)3(bpy)2]NO3·2H2O (1), [(VO)2(dpp)3(phen)2]-NO3·H2O (2), [(VO)2(bmp)3(bpy)2]NO3·H2O (3), and [(VO)2(bmp)3(phen)2]NO3·H2O (4), and copper (II) complexes having the formula [Cu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc8c91ce8936c1bebdf10a6d3f5c0a5f
https://doi.org/10.1016/s1387-7003(02)00779-7
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9
NMR Study of Weak Antiferromagnetism in NbFe2
Autor: Yoshio Kitaoka, Kunisuke Asayama, Tetsuro Murakami, Akihiko Sakata, Yoshihiro Yamada, Koichi Koga, Hiroyuki Nakamura
Publikováno v: Journal of the Physical Society of Japan. 59:2976-2985
The 93 Nb NMR and magnetization have been measured to investigate the nature of weak antiferromagnetism in the hexagonal C-14 Laves phase compound, NbFe 2 . The temperature and magnetic field dependence of the magnetization and nuclear spin-lattice r
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::18d7b3e0af671e643d9d06a804e612dc
https://doi.org/10.1143/jpsj.59.2976
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10
Superconducting properties of La2CuO4+δ annealed in high pressure oxygen gas
Autor: Shigeo Kashiwai, Kunisuke Asayama, Yoshihiro Yamada, Muneyuki Motoyama, Hirofumi Ochiai, Yasukage Oda, Takao Kohara, Masaru Yamada, Koichi Koga
Publikováno v: Solid State Communications. 73:725-728
Electrical and magnetic properties of (La1−xSrx)2CuO4+δ annealed in high pressure oxygen gas up to 400 bar are studied. The superconducting La2CuO4+δ includes two separate phases: one is the superconducting phase with extra oxygen, and the other
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::596c90640d7eeb4bc82f08998dbf6e87
https://doi.org/10.1016/0038-1098(90)90562-p
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