Toshiyuki Oshiki
Okayama University
Medicinal chemistryCatalysisDenticityOrganic chemistryInorganic chemistryChemistryPolymer chemistryTrifluoromethanesulfonateOctanePhosphineTolueneAmideBoranesAlkyneReagentElectrophilePhosphorusTantalumYield (chemistry)CopperRutheniumStereochemistryLigandOxidative additionWalden inversionHypervalent molecule
52Publications
20H-index
1,293Citations
Publications 43
Newest
#1Ken ichi Yamamoto (Okayama University)H-Index: 13
#2Toshiyuki Oshiki (Okayama University)H-Index: 20
Last. Masakiyo Sakaguchi (Okayama University)H-Index: 50
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The worldwide microplastic pollution in our environment is a matter of great concern. Harmful effects of plastics have been reported in various types of organisms including murine animals. We examined the presence of microplastics in four types of shellfish purchased from fish markets in Okayama, Japan and served to the public: short-neck clam (Ruditapes philippinarum, asari in Japanese), hard-shell clam (Meretrix lusoria, hamaguri), brackishwater clam (Cyrenidae, shijimi), and oyster (Crassostr...
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#1Ken ichi Yamamoto (Okayama University)H-Index: 13
#2Hiroko Kagawa (Okayama University)
Last. Masakiyo Sakaguchi (Okayama University)H-Index: 50
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An increasing accumulation of microplastics and further degraded nanoplastics in our environment is suspected to have harmful effects on humans and animals. To clarify this problem, we tested the cytotoxicity of two types of plastic wrap on human cultured liver cells and mouse primary cultured liver cells. Alcohol extracts from plastic wrap, i.e., polyvinylidene chloride (PVDC), showed cytotoxic effects on the cells. Alcohol extracts of polyethylene (PE) wrap were not toxic. The commercially ava...
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#1Masahito Murai (Okayama University)H-Index: 21
#2Ryuji Taniguchi (Okayama University)H-Index: 3
Last. Kazuhiko Takai (Okayama University)H-Index: 63
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Stabilization by a silyl group on the methylene carbon and a diamine ligand led to the isolation of gem-dichromiomethane species. X-ray crystallography confirmed the identity of the structure of this rare example of reactive gem-dimetalloalkane species. The isolated gem-dichromiomethane complex acted as a storable silylmethylidene carbene equivalent, with reactivity that could be changed dramatically upon addition of a Lewis acid (ZnCl2) and a base (TMEDA) to promote both silylalkylidenation of ...
17 CitationsSource
1 CitationsSource
#1Toshiyuki OshikiH-Index: 20
#1Yuta Akizuki (Okayama University)H-Index: 1
#2Mikio Yoshida (Okayama University)H-Index: 12
Last. Jun Oshitani (Okayama University)H-Index: 15
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Size distribution, ζ potential, and yield of surfactant-free oil-in-water (O/W) emulsion prepared with oleic acid were measured at various pHs after seven days from the emulsification. We found tha...
4 CitationsSource
#1Yumiko Takagi (Kagawa University)H-Index: 14
#2Yoriko Kusunoki (Kagawa University)H-Index: 1
Last. Toshiyuki Oshiki (Okayama University)H-Index: 20
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1-Ethyl-3-methylimidazolium ethylsulfate ([C2mim][EtSO4]) was mixed with iron(III) chloride·6H2O to give a magnetic ionic liquid composed of the hybrid-type anion, [C2mim][FeCl3·EtSO4], which showed a slightly different magnetic property than [C2mim][FeCl4]. On the other hand, reaction of [C2mim][EtSO4] with cobalt(II) chloride hydrate formed [C2mim]2[CoIICl4], the structure of which was characterised by X-ray crystallographic analysis.
9 CitationsSource
#1Makoto Muranaka (Okayama University)H-Index: 5
#2Isao Hyodo (Okayama University)H-Index: 2
Last. Toshiyuki Oshiki (Okayama University)H-Index: 20
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Abstract New homogeneous catalyst comprised of [Ru(methallyl)2(cod)] (cod = 1,5-cyclooctadiene) (1) and 2-diphenylphosphanyl-4-pyridyl(dimethyl)amine (2) is shown to efficiently catalyze the hydration of various nitriles under neutral conditions. The hydration proceeds in the presence of 0.5 mol% of the ruthenium catalyst at 80 °C in 1,2-dimethoxyethane solution and the corresponding amide is obtained within few hours without the formation of byproducts. Comparison of some phosphine ligands for ...
33 CitationsSource
#1Toshiyuki OshikiH-Index: 20
#2Isao Hyodo (Okayama University)H-Index: 2
Last. Akinori Ishizuka (Okayama University)H-Index: 2
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New bifunctional chemical catalysts for the hydration of nitriles are described. cis-Ru(acac)2(PPh2py)2 exhibited high activity, with a turnover frequency of up to 20,900 (mol of amide)/((mol of catalyst)h). Newly synthesized iridium complexes bearing a PPh2py ligand have a 16e- square planar structure. The catalytic hydration of nitriles proceeded at 80 °C within few hours to give corresponding amides in almost quantitative yield. Moreover, the iridium complexes acted as a catalyst for the hydr...
18 CitationsSource
#1Kenji Michiue (Mitsui Chemicals)H-Index: 9
#2Toshiyuki OshikiH-Index: 20
Last. Terunori Fujita (Mitsui Chemicals)H-Index: 52
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Four new Ta complexes bearing tris(pyrazolyl)borate ligands, Tp*TaCl(η2-3-hexyne)(benzyl) [1; Tp* = HB(3,5-dimethylpyrazolyl)3−], TpMs*TaCl2(η2-3-hexyne) [2; TpMs* = HB(3-mesitylpyrazolyl)2(5-mesitylpyrazolyl)−], TpMs*TaCl2(═N-2,6-iPr2C6H3) (3), and TpMsTaCl2(═N-tBu) [4; TpMs = HB(3-mesitylpyrazolyl)3−], were prepared in moderate to high yields from appropriate TaCl3(R) (R; η2-3-hexyne, ═N-2,6-iPr2C6H3, ═N-tBu) species and the potassium or thallium salt of the corresponding tris(pyrazolyl)borate...
21 CitationsSource