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1.
0IntroductionThefirstmolecule鄄basedmagnetswerereportedin1986[1].Duringthelasttwodecades,moreandmoreattentionhasbeenpaidtothesynthesisofmolecule鄄basedmagnets,especiallytoPrussianBlueanalogu鄄es[2].TheoldPrussianBlueanalogueshavebeenbroughtuptodateduetoth… 相似文献
2.
A new efficient system for transporting saccharides through a liquid membrane has been constructed. The transport rates of saccharides were accelerated greatly by the cyclodextrin dimer 2; by contrast, the corresponding cyclodextrin monomer 1 was not effective at mediating saccharide transport. The transport rate of D-ribose through a chloroform liquid membrane was 17 times faster when the cyclodextrin dimer 2 was used as the transporter than when the cyclodextrin monomer 1 was used. Similarly the transport rate of methyl D-galactopyranoside was 16 times faster by 2 than by 1. 相似文献
3.
Haruki Toyoda Shigefumi Naka Akiyuki Kinouchi 《Czechoslovak Journal of Physics》2006,56(10-11):1305-1310
We study a way ofq-deformation of the bi-local system, the two-particle system bounded by a relativistic harmonic-oscillator type of potential, from both points of view of mass spectra and the behavior of scattering amplitudes. In our formulation, the deformation is done so thatP 2, the square of center-of-mass momentum, enters into the deformation parameters of relative coordinates. As a result, the wave equation of the bi-local system becomes nonlinear with respect toP 2; then, the propagator of the bi-local system suffers significant change so as to get a convergent self energy to the second order. The study is also made on the covariantq-deformation in four-dimensional spacetime. 相似文献
4.
Akiyuki Hamasaki Akiko Muto Shingo Haraguchi Xiaohao Liu Takanori Sakakibara Takushi Yokoyama Makoto Tokunaga 《Tetrahedron letters》2011,52(51):6869-6872
A treatment of cobalt oxide supported gold nanoparticles (Au/Co3O4) under syngas atmosphere effectively generated a cobalt carbonyl-like active species in the reaction vessel. The preparation of Au/Co3O4 was quite simple and the in situ generated cobalt species could be used as a stable and easy handling alternative for dicobalt octacarbonyl without bothersome purification prior to use. The reactions, which are sensitive to the purity of the dicobalt octacarbonyl, such as the alkoxycarbonylation of epoxides and the Pauson-Khand reaction, smoothly progressed with Au/Co3O4. 相似文献
5.
Kentaro Yachi Hiroshi Shinokubo Koichiro Oshima 《Angewandte Chemie (International ed. in English)》1998,37(18):2515-2517
The one-pot synthesis of cyclopropyl compounds from 1-alkynes has been achieved by direct cyclopropanation of a 1-alkenylzinc species upon treatment with iodomethylzinc and trapping of the cyclopropylzinc intermediate with allyl bromide in the presence of CuCN⋅2 LiCl (see reaction scheme). This method proceeds under mild conditions and in good yield. 相似文献
6.
The oxidation of primary and secondary benzylic alcohols was achieved by using tert-butyl nitrite (t-BuONO) as a stoichiometric oxidant. Various substrates were effectively converted into the corresponding ketones or aldehydes in good to excellent yields. The reaction presumably proceeded by a nitrosyl exchange and a subsequent thermal decomposition of benzylic nitrites. This process would realize an oxidation of alcohols with oxygen in theory by combining with a reproduction of alkyl nitrites from NO and alcohols under an O2 atmosphere. In addition, almost pure oxidized products were readily obtained by simple evaporation of the reaction mixtures since t-BuONO produced only volatile side products. 相似文献
7.
Kuniaki Tatsuta Tomohiro Fukuda Tatsuya Ishimori Rearu Yachi Shinpei Yoshida Hiroshi Hashimoto Seijiro Hosokawa 《Tetrahedron letters》2012,53(4):422-425
The first total synthesis of hibarimicinone has been achieved. The polyhydroxydecalin moieties (AB and GH rings) have been synthesized from sulfonylenone 4 derived from d-arabinose. The chiral biaryl 20 was coupled with two polyhydroxydecalins 11 by Michael–Dieckmann type condensation to give the eight rings system. Aromatization and oxidation with Ag+ gave quinone 24, and the subsequential transannular etheration gave the hibarimicinone skeleton. Deprotection and tautomerization were performed in one pot to give hibarimicinone (1). 相似文献
8.
Analysis of antimony around the abandoned Tsugu mine in Aichi Prefecture by neutron activation analysis 总被引:1,自引:0,他引:1
Y. Katayama A. Misawa N. Yamada S. Yachi H. Muto T. Aoki Y. Kawabata M. Nagai 《Journal of Radioanalytical and Nuclear Chemistry》2008,278(2):283-286
At Tsugu mine in Aichi Prefecture, antimony was mined and smelted until 1956. The amounts of antimony present in the soil
of the abandoned mine were measured to enable us to detect any traces of the operation of the mine and to measure the level
of environmental contamination with antimony. The quantity of antimony in rings of hinoki and sugi was also measured to obtain
information about chronological changes in environmental conditions. The quantity of antimony in the samples was determined
by INAA. The antimony concentrations in eight soil samples at different points in the Tsugu mine area were 8–17,000 ppm. 相似文献
9.
A new cyano-bridged GadoliniumⅢ-IronⅢ complex {[Gd(DMF)3(DMSO)(H2O)3](μ-CN)[Fe(CN)5]}·2H2O (DMF=N,N-dimethylformamide; DMSO=dimethylsulfoxide) was synthesized by the grinding reaction method. It crysta-llizes in the triclinic, space group P1 with cell parameters: a=0.90363(2) nm, b=1.250 78(3) nm, c=1.41303(1) nm, α=93.174(1)°, β=94.406(1)°, γ=91.817(2)°, and V=1.588 87(5) nm3, Dc=1.582 g·cm-3, Z=2, Mr=756.72, F(000)=760, μ=2.645 mm-1. The slightly distorted square-antiprism eightfold-coordinated Gd(Ⅲ) and the approxi-mately oriented octahedrally sixfold-coordinated Fe(Ⅲ) are linked by a cyano-bridge group to construct a dinuclear compound. The {[Gd(DMF)3(DMSO)(H2O)3](μ-CN)[Fe(CN)5]} species are held together via hydrogen bonds to form a three-dimensional framework. The Gd(Ⅲ)-Fe(Ⅲ) interaction is antiferromagnetic. CCDC: 223430. 相似文献
10.
Huricha Baigude Kaname Katsuraya Kousaku Okuyama Yoshihide Yachi Shoma Sato Toshiyuki Uryu 《Journal of polymer science. Part A, Polymer chemistry》2002,40(21):3622-3633
A reactive three‐layered dendrimer containing carboxyl groups was synthesized by the coupling of dicarboxylic acid and a highly reactive, two‐layered glycopeptide dendrimer. Lactose, maltose, or maltotriose was reacted with the poly(lysine) dendrimer in its third and fourth generations by reductive amination and afforded two‐layered glycolysine dendrimers. The reaction was conducted in a borate buffer (pH 9.0). 1H NMR, 13C NMR, and matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry analyses were applied for the determination of the structures of the products. When an excess amount of the oligosaccharide and a long reaction time were used, the degree of substitution increased to 1.5–2.0 against an amino group. For the preparation of highly reactive, multilayered dendrimers for an antigen carrier, C6 hydroxy groups of the oligosaccharides were selectively esterified by adipic acid and suberic acid to give 6‐O‐adipoyl oligosaccharide–poly(lysine) dendrimers and 6‐O‐suberoyl oligosaccharide–poly(lysine) dendrimers. The reactivity of these multilayered dendrimers was examined by a model reaction with phenylalanine ethyl ester. The dendrimer showed high reactivity, providing phenylalanine ethyl ester–dicarboxylate oligosaccharide–poly(lysine) dendrimers with a considerably high proportion of phenylalanine residues. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3622–3633, 2002 相似文献