Výsledky vyhledávání - "Ryuhei Wakita"

Complexation of acyclic ligands having two terminal quinoline units with alkali metal cations

Autor: Toshiyuki Kida, Mitsuo Okahara, Yohji Nakatsuji, Kazuhiko Fujiwara, Ryuhei Wakita, Masakatsu Sugimoto, Araki Masuyama

Publikováno v: Supramolecular Chemistry. 2:145-151

Acyclic multidentate ligands consisting of an oligooxyethylene chain (di-, tri-, tetra-, and penta-) and two terminal rigid quinaldate end groups were newly prepared and their complexation properties with alkali metal cations were estimated by the so

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c09152a33d7934afee316820b408d744
https://doi.org/10.1080/10610279308038309

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ChemInform Abstract: Synthesis and N-Alkylation of 5-Bromomethyl-5-methyl-1,4,7,10-tetraoxa- 13-azacyclopentadecane

Autor: Yohji Nakatsuji, Misao Tsubakihara, Mitsuo Okahara, Ryuhei Wakita

Publikováno v: ChemInform. 22

5-Bromomethyl-5-methyl-1,4,7,10-tetraoxa-13-azacyclopentadecane (monoaza-15-crown-5) was prepared by the reaction of 4-bromomethyl-4-methyl-1,8-ditosyloxy-3,6-dioxaoctane, prepared from the corresponding dihydroxy compound, by reaction with bis(2-hyd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::37b33e2ec708424dd7a29bc7cfdb3cc9
https://doi.org/10.1002/chin.199122174

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Selective transport of lithium ions by an acyclic carboxylic ionophore with a quinaldate moiety through a bulk liquid membrane

Autor: Mitsuo Okahara, Yohji Nakatsuji, Michiyuki Matsumoto, Ryuhei Wakita

Publikováno v: Journal of Membrane Science. 57:297-306

New quinaldate derivatives having an additional donor group on the 8-position of the quinoline ring were prepared and their transport abilities toward alkali metal cations in the bulk liquid membrane were examined. Most of the ionophores ( 1-3, 5, an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c51705ba8c297375865ca5cc87488e6
https://doi.org/10.1016/s0376-7388(00)80685-7

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Pseudo cyclic ionophores: ?Binary-effect? of quinolinyloxy groups at both ends of oligoethylene glycols on the conformational stabilization of their complexes with alkali metal salts

Autor: Masanori Miyakoshi, Mitsuo Okahara, Yohji Nakatsuji, Ryuhei Wakita

Publikováno v: Journal of Inclusion Phenomena and Molecular Recognition in Chemistry. 10:127-139

A series of noncyclic neutral ionophores has been synthesized by the reaction of oligoethylene glycol dihalides with 8-quinolinol. Complexation properties for alkali metal picrates were evaluated from solvent extraction and bulk liquid membrane trans

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72a9c9ce0dbc34705d15d0b41b02b483
https://doi.org/10.1007/bf01041646

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High Cation Extractabilities of Acyclic Ionophores Having Quinaldate Moieties and Their Conformations in Solution

Autor: Kazuhiko Fujiwara, Mitsuo Okahara, Ryuhei Wakita, Yohji Nakatsuji

Publikováno v: Chemistry Letters. 19:1897-1900

New acyclic ionophores with two quinaldate terminal moieties showed efficient extraction abilities toward alkali metal ions; one of them extracted K+ on about the same level with unsubstituted 18-crown-6. Their conformations in solution were examined

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d17feeed48935f8c8fb4fbe52055e305
https://doi.org/10.1246/cl.1990.1897

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Purification and cDNA Cloning of NADPH-Dependent Aldoketoreductase, Involved in Asymmetric Reduction of Methyl 4-Bromo-3-Oxobutyrate, from Penicillium citrinum IFO4631

Autor: Masatoshi Shimizu, Hiroyuki Asako, Kenji Matsumura, Jun Sakai, Nobuya Itoh, Ryuhei Wakita

Penicillium citrinum was found to catalyze the reduction of methyl 4-bromo-3-oxobutyrate to methyl ( S )-4-bromo-3-hydroxybutyrate [( S )-BHBM] with high optical purity. From the strain, a cDNA clone encoding a novel NADPH-dependent alkyl 4-halo-3-ox

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::645f4419ccd8557471fe0d87dbf2d85d
https://europepmc.org/articles/PMC546806/

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Purification and characterization of NADPH-dependent aldo-keto reductase specific for beta-keto esters from Penicillium citrinum, and production of methyl (S)-4-bromo-3-hydroxybutyrate

Autor: Hiroyuki Asako, Tohru Dairi, M. Shinohara, Yoshihide Makino, Nobuya Itoh, Masatoshi Shimizu, Ryuhei Wakita, K. Banno

Publikováno v: Applied microbiology and biotechnology. 66(1)

A novel beta-keto ester reductase (KER) was purified to homogeneity from recombinant Escherichia coli (pTrcKER) cells, which efficiently expressed the ker gene cloned from Penicillium citrinum IFO4631. The enzyme was monomeric and had a molecular mas

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9db3cccff985d492e205f0e1d25a766d
https://pubmed.ncbi.nlm.nih.gov/15338078

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Synthesis of methyl-substituted lariat ethers containing a 13-crown-4 ring

Autor: Mitsuo Okahara, Masayuki Yonetani, Ryuhei Wakita, Yohji Nakatsuji

Publikováno v: Journal of Heterocyclic Chemistry. 27:1337-1339

Convenient synthetic procedures for preparing two kinds of methyl-substituted lariat ethers containing a 13-crown-4 ring, are described.Some of these compounds were obtained from the reaction of 2-bromomethyl-2-methyl-13-crown-4 (I) with the appropri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::492a601f3b71aad9f8fdefadbe3aaa87
https://doi.org/10.1002/jhet.5570270529

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