A5063013608- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organometallic Complex Synthesis and Catalysis
- Synthesis and characterization of novel inorganic/organometallic compounds
- Organoboron and organosilicon chemistry
- Crystallography and molecular interactions
- Coordination Chemistry and Organometallics
- Asymmetric Hydrogenation and Catalysis
- Synthetic Organic Chemistry Methods
- Catalytic Cross-Coupling Reactions
- Inorganic Chemistry and Materials
- Metalloenzymes and iron-sulfur proteins
- Inorganic and Organometallic Chemistry
- Magnetism in coordination complexes
- Ferrocene Chemistry and Applications
- Physics of Superconductivity and Magnetism
- Catalysis and Oxidation Reactions
- Organometallic Compounds Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Graphene research and applications
- Metal complexes synthesis and properties
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Carbon dioxide utilization in catalysis
- Catalytic Alkyne Reactions
Tohoku University
2015-2024
Liechtenstein Institute
2023
National Institute of Diabetes and Digestive and Kidney Diseases
2022
ProQuest (United States)
2022
The University of Tokyo
2012-2020
Graduate School USA
2014-2018
Sendai University
2014-2018
Japan Atomic Energy Agency
2014-2016
International Superconductivity Technology Center
2012-2014
Fujikura (Japan)
2012-2014
The metal–silicon bond in silylene complexes is highly polarized a Mδ−–Siδ+ manner. Accordingly, show high reactivities toward nucleophiles, such as water, alcohols, ketones, isocyanates, and phosphorus ylides. double can also activate aromatic carbon–hydrogen bonds. Among the various complexes, silyl(silylene) occupy unique position; these undergo intramolecular 1,3-migration, which postulated key step metal-mediated redistribution of substituents on organosilicon compounds. Alkyl(silylene)...
The introduction of effective artificial pinning centers into pulsed laser deposition derived Gd1Ba2Cu3O7−δ coated conductors has been studied with a view to improving the Ic–B–θ properties. BaMOx (M = metal) was introduced film, expectation forming fine nanorods such as BaZrO3 ones. BaHfO3 doped showed remarkably good characteristics, even at high temperature. A short sample 1 µm film thickness prepared using reel-to-reel system minimum Ic value 30 A/cm-w@77 K (A/cm-w@77 be read 'amps per...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and x-ray crystal structure of a donor-stabilized bis(silylene)iron complexKeiji. Ueno, Hiromi. Tobita, Mamoru. Shimoi, Hiroshi. OginoCite this: J. Am. Chem. Soc. 1988, 110, 12, 4092–4093Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.1021/ja00220a089https://doi.org/10.1021/ja00220a089research-articleACS PublicationsRequest reuse...
Ring around the RuSi: Abstraction of a pyridine ligand with BPh3 was used to synthesize silylene complex 1 (see scheme), which reacts nitriles at room temperature give silylisocyanide 3 by CC bond activation. The structure key intermediate 2 an η2-SiH agostic interaction is given along mechanisms for formation and 3.
A cationic germylene containing tungsten and N-heterocyclic carbene units reacted with H2 in fluorobenzene at 60 °C, resulting its insertion into the H-H bond. It also activated Si-H bond of ethyldimethylsilane B-H pinacolborane ambient temperature to give products. The latter reactions against hydrosilane hydroborane were found be reversible.
Rock solid: Fullerene-encapsulated Li+ (Li+@C60) is an alkaline cation owing to the spherical shape and positive charge. Li+@C60 crystallizes as a rock-salt-type crystal in presence of PF6−. The orientations C60 (green; see picture) PF6− (orange) are perfectly ordered below 370 K, (purple) hops within cage. At temperatures 100 K two units localized at polar positions each C60.
A synthetic protocol for endohedral fullerene containing lithium (Li@C60), as well the synthesis, characterization, and properties of its chemically oxidized derivative [Li+@C60][PF6−] are reported in full. Simultaneous deposition Li plasma C60 produces a mixture Li@C60 C60. Strong intermolecular attraction between has prevented their separation, but this obstacle was surmounted by selective chemical oxidation Li@C60, which led to isolation substantial amount pure [Li+@C60][PF6−]. For...
A hydrido ligand bridging a WSi bond is present in novel hydrido(hydrosilylene)–tungsten complex (see picture) and its η5-C5Me5 analogue, which were synthesized by photolysis of [Cp′W(CO)3Me] (Cp′=η5-C5Me4Et, η5-C5Me5) the presence H3SiC(SiMe3)3. This strong hydrido–silylene interligand interaction was revealed NMR spectroscopic X-ray structural analyses.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of alkoxy-substituted disilanyliron complexes: preparation donor-stabilized bis(silylene)iron complexes and the crystal structure [cyclic] (Me2Si)[(.eta.5-C5Me5)Fe(CO)][SiMe(OMe)]OMeHiromi Tobita, Keiji Ueno, Mamoru Shimoi, Hiroshi OginoCite this: J. Am. Chem. Soc. 1990, 112, 9, 3415–3420Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisilene system (R2Si:SiR2). The tetra-tert-butyl derivativeSatoru Masamune, Shu Murakami, and Hiromi TobitaCite this: Organometallics 1983, 2, 10, 1464–1466Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 October 1983https://pubs.acs.org/doi/10.1021/om50004a041https://doi.org/10.1021/om50004a041research-articleACS PublicationsRequest reuse permissionsArticle...
Reaction of NHC-stabilized dichlorogermylenes (NHC = N-heterocyclic carbene) with an anionic tungsten complex produced chlorometallogermylenes. Subsequent chloride abstraction from the products NaBAr4 (Ar 3,5-(CF3)2C6H3) gave a cationic metallogermylene or dicationic dimetallodigermenes.
The germylyne complex 2 was obtained by dehydrogenation of a hydrido (hydrogermylene) 1 with mesityl isocyanate on heating. A reaction intermediate 3 also isolated room temperature reaction, which converted into heating, elimination MesNHCHO. possible mechanism for the formation elucidated kinetic studies and DFT calculations. heavier analogues transition-metal carbyne complexes are attractive synthetic targets research in fundamental organometallic main-group chemistry. Over last 15 years,...
Covalently organic derivatization of [Li(+)@C60]PF6(-) to obtain Li(+)-encapsulated PCBM, [Li(+)@PCBM]PF6(-), is described. Synthetic procedures, electrochemical properties, light absorption details isomerization from [5,6]- [6,6]-isomer, and X-ray crystal structure [Li(+)@PCBM]PF6(-) are discussed.
Reactions of hydrido(hydrosilylene)tungsten complexes, Cp'(CO)2(H)W=Si(H)[C(SiMe3)3], with nitriles (MeCN, tBuCN) at 60 degrees C gave hydrosilylation products, Cp'(CO)2W[kappa2(N,Si)-Si(H)(N=CHR'){C(SiMe3)3}] (R' = Me, tBu), a novel W-Si-N three-membered ring structure. The product the tBuCN underwent reversible rearrangement 70 to silylene complex, Cp'(CO)2(H)W=Si(N=CHtBu)[C(SiMe3)3], which was major component in equilibrium. A reaction mechanism for involving coordination ligand and...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of tetrakis(2,6-diethylphenyl)disileneSatoru Masamune, Shu Murakami, James T. Snow, Hiromi Tobita, and David J. WilliamsCite this: Organometallics 1984, 3, 2, 333–334Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Published inissue 1 February 1984https://pubs.acs.org/doi/10.1021/om00080a033https://doi.org/10.1021/om00080a033research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexaalkylcyclotrisilanes (R2Si)3: hexakis(1-ethylpropyl) and hexaisopropyl derivativesSatoru Masamune, Hiromi Tobita, Shu MurakamiCite this: J. Am. Chem. Soc. 1983, 105, 21, 6524–6525Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 October 1983https://pubs.acs.org/doi/10.1021/ja00359a046https://doi.org/10.1021/ja00359a046research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,1,2,2-Tetrakis(2,6-dimethylphenyl)-1,2-disilacyclopropaneSatoru Masamune, Shu Murakami, Hiromi Tobita, and David J. WilliamsCite this: Am. Chem. Soc. 1983, 105, 26, 7776–7778Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 1983https://pubs.acs.org/doi/10.1021/ja00364a069https://doi.org/10.1021/ja00364a069research-articleACS PublicationsRequest reuse permissionsArticle...
Addition of BaHfO3 (BHO) nano-rods as pinning centers into a GdBa2Cu3Oy (GdBCO) coated conductor dramatically improves the critical current properties in high magnetic fields. This is partly ascribed to strong flux these centers. In this paper it reported that improvement mainly caused by unexpected enhancement upper field, Bc2. The mechanism Bc2 not yet clear, although strain around interface between center and superconducting matrix or itself may scatter electrons. result suggests property...
Treatment of the hydrido hydrosilylene complex Cp*(CO)2(H)W═Si(H)Tsi (1; Tsi = C(SiMe3)3) with 1 equiv MeIiPr (MeIiPr 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) caused deprotonation to afford anionic silylene [Cp*(CO)2W═Si(H)Tsi][HMeIiPr] (2). The hydrogen on ligand 2 was then abstracted as a hydride B(C6F5)3 give mixture and tungsten–silylyne Cp*(CO)2W≡SiTsi (4), from which 4 isolated in pure form. molecular structure determined by X-ray crystal analysis.
Abstract Treatment of pyridine‐stabilized silylene complexes [(η 5 ‐C Me 4 R)(CO) 2 (H)WSiH(py)(Tsi)] (R=Me, Et; py=pyridine; Tsi=C(SiMe 3 ) with an N‐heterocyclic carbene I i Pr (1,3‐diisopropyl‐4,5‐dimethylimidazol‐2‐ylidene) caused deprotonation to afford anionic WSiH(Tsi)][H Pr] (R=Me ( 1‐Me ); R=Et 1‐Et )). Subsequent oxidation and pyridine‐ N ‐oxide (1 equiv) gave η ‐silaaldehydetungsten W{η ‐OSiH(Tsi)}][H 2‐Me 2‐Et The formation unprecedented W‐Si‐O three‐membered ring was...
A ruthenium complex bearing a bis(silyl)xanthene chelate ligand xantsil, i.e. Ru[κ3(Si,O,Si)-xantsil](CO)(PCyp3) (1a, Cyp = cyclopentyl), was found to catalyze both double and single hydroboration reactions of nitriles with pinacolborane (HBpin) 9-borabicyclo[3.3.1]nonane (9-BBN) give bis(boryl)amines 2 N-borylimines 3, respectively, in mostly >99% yields. By combination these subsequent palladium-catalyzed deborylative C–N coupling 3 1:1 mixture bromoarenes KOtBu, one-pot synthetic routes...