bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oxidative Reaction of 1,5-Dithioniabicyclo[3.3.0]octane Bis(trifluoromethanesulfonate) with Diene Complexes of Zirconium and Tantalum: Synthesis of Cp2Zr(OTf)2(thf) and Cp(η4-1,3-butadiene)Ta(OTf)2
Authors: Mashima Kazushi , Oshiki Toshiyuki , Matsuo Yutaka , Tani Kazuhide 
Published: July 2004

Abstract
Oxidative addition of a hypervalent organosulfur compound, 1,5-dithioniabicyclo[3.3.0]octane bis(trifluoromethanesulfonate) (1), to diene complexes of zirconium and tantalum, Cp2Zr(η4-1,3-butadiene) and CpTa(η4-1,3-butadiene)2, in THF resulted in the almost quantitative formation of bis(triflate) complexes of zirconium, Cp2Zr(OTf)2(thf) (3), and tantalum, CpTa(η4-1,3-butadiene)(OTf)2 (5), respectively.
Lanthanoid Complexes of Azobenzene and Benzo[c]cinnoline Derived from Metallic Lanthanoids: Crystal Structures of Binuclear [SmI(thf)3(μ-η2:η2-trans-PhNNPh)SmI(thf)3] and Mononuclear [Yb(benzo[c]cinnoline)3(thf)2]
Authors: Nakayama Yuushou , Nakamura Akira , Mashima Kazushi 
Published: July 2004

Abstract
A binuclear samarium complex of azobenzene, [SmI(thf)3(μ-η2:η2-trans-PhNNPh)2SmI(thf)3], prepared by treating metallic samarium with azobenzene in the presence of iodine was characterized crystallographically. Reaction of metallic ytterbium with benzo[c]cinnoline, a cis-azo compound, gave Yb(bc)3(thf)2 (bc = benzo[c]cinnoline) that is monomeric and adopts distorted dodecahedral geometry, determined by X-ray analysis.
Reaction of Silyl(carbonyl)iron Complexes with LiAlH4 Giving Methylsilanes: Reduction of a Carbonyl Ligand and Coupling with a Silyl Group
Authors: Tobita Hiromi , Shiozawa Rie , Ogino Hiroshi 
Published: July 2004

Abstract
Treatment of CpFe(CO)2SiR3 (R3 = (pTol)2H, (pTol)2Me, MePh(1-Nap); 1-Nap = 1-naphthyl) with LiAlH4 in ether or THF at room temperature gave CH3SiR3 as a major product in moderate to high yield. The labeling experiments using LiAlD4 and CpFe(13CO)2SiR(pTol)2 (R = H, Me) proved unambiguously that the carbonyl ligand is reduced with LiAlH4 and coupled with the silyl group to give the methylsilane.
Accumulation of Cationic-polymer Grafted Poly(styrene) Nanospheres onto an Anionic-polymer Surface
Authors: Serizawa Takeshi , Akashi Mitsuru 
Published: July 2004

Abstract
Styrene nanospheres bearing cationic-polymers such as poly(vinylamine) on their surfaces were accumulated on an anionic-polymer surface by both electrostatic and hydrophobic interactions. Quantitative analyses of the adsorption amount by a quartz crystal microbalance (QCM) revealed that the adsorption behavior of the nanospheres was strongly influenced by the ionic strength in aqueous solution of the nanosphere.
4,5-Diiodo-4′,5′-ethylenedioxytetrathiafulvalene and Its Metallic Radical Salts
Authors: Kuwatani Yoshiyuki , Ogura Eiji , Nishikawa Hiroyuki , Ikemoto Isao , Iyoda Masahiko 
Published: July 2004

Abstract
4,5-Diiodo-4′,5′-ethylenedioxy-TTF (EDO-TTFI2) was synthesized in moderate yield by the reaction of EDO-TTF with LDA, followed by quenching with CF3(CF2)5I. Although EDO-TTF contains electron-withdrawing iodine as the substituent, this compound has a similar donor ability to BEDT-TTF. The radical-cation salt (EDO-TTFI2)2·ClO4 shows a metallic conductivity down to 50 K, reflecting the strong I···O interaction.
Synthesis and Crystal Structure of the Tetranuclear Copper(I) Complex [Cu4I4(MPTQ)2] with a N,S,N′-Tridentate Ligand(MPTQ = 8-((2-Pyridylmethyl)thio)quinoline)
Authors: Su Cheng-Yong , Kang Bei-Sheng , Sun Jie 
Published: July 2004

Abstract
Copper(I) iodide reacts with 8-((2-pyridylmethyl)thio)quinoline (MPTQ) to give the tetranuclear cluster complex [Cu4I4(MPTQ)2] which has been structurally characterized, showing that the Cu4I4 core exists in a distorted chair-like structure with four copper atoms forming parallelogram which is bridged by iodine atoms on each short sides, by S, N-MPTQ on each long sides and with two additional iodine atoms face-bridging sets of three copper atoms on opposite sides of the parallelogram.
Palladium-Catalyzed Reaction of Aryl Bromides with Dialkylacetylenes to Produce Allenic Compounds
Authors: Pivsa-Art Sommai , Satoh Tetsuya , Miura Masahiro , Nomura Masakatsu 
Published: July 2004

Abstract
It has been found that aryl bromides, especially ortho-substituted ones, effectively react with dialkylacetylenes in the presence of a palladium catalyst and an appropriate base to give the corresponding aryl-substituted allenes as the predominant products.
Use of an Organometallic Reagent in Water: Sc(OTf)3-Catalyzed Allylation Reactions of Aldehydes in Micellar Systems
Authors: Kobayashi Shu , Wakabayashi Takeshi , Oyamada Hidekazu 
Published: July 2004

Abstract
The Sc(OTf)3-catalyzed allylation reactions of aldehydes with tetraallyltin proceeded smoothly in micellar systems to afford the corresponding homoallylic alcohols in high yields. The reactions were successfully carried out in the presence of a small amount of a surfactant in water without using any organic solvents.
Reaction Dynamics of Ba + CH3Br/HBr → BaBr + CH3/H
Authors: Wu Victor Wei-Keh , Han Ke-Li , He Guo-Zhong 
Published: July 2004

Abstract
QCT calculations for reactions Ba + CH3Br and Ba + HBr on LEPS surfaces within 0.01 ≤ Erel ≤ 3.0 eV by comparison with available experimental data within 0.075 ≤ Erel ≤ 2.31 eV have been done. The reaction dynamics of both chemical reactions have been obtained and their mechanisms have been deduced. The difference of the reaction dynamics via stripping and migration have been graphically described. The H atom of HBr shows enormous contribution of migration in the reaction of Ba+HBr, though the volume of H is comparably much smaller.
Hydrogen Abstraction From Unactivated Hydrocarbons Using a Photochemically Excited Isoindoline Nitroxide
Authors: Bottle Steven E , Chand Ugesh , Micallef Aaron S 
Published: July 2004

Abstract
The photochemically excited nitroxide, 1,1,3,3-tetramethylisoindolin-2-yloxyl (1*), abstracts primary, secondary or tertiary hydrogens from unactivated hydrocarbons including cyclohexane, isobutane and n-butane. The resultant carbon-centred radicals are rapidly and efficiently trapped by ground state nitroxide. Hydrogen abstraction from methane may also occur, but is masked by secondary photochemical reactions.
Photocatalytic Decomposition of Water into H2 and O2 over Novel Photocatalyst K3Ta3Si2O13 with Pillared Structure Consisting of Three TaO6 Chains
Authors: Kudo Akihiko , Kato Hideki 
Published: July 2004

Abstract
The novel catalysts of native and NiO-loaded K3Ta3Si2O13 with pillared structure consisting of three linear TaO6 chains showed luminescence and high photocatalytic activities for the decomposition of distilled water into H2 and O2 in stoichiometric amounts under UV irradiation.
Synthesis of Benzene from Methane and Carbon Monoxide over Silica-Supported Rh, Ru and Pd Catalysts
Authors: Naito Shuichi , Karaki Tadahiko , Iritani Toshiaki 
Published: July 2004

Abstract
Benzene was formed selectively among hydrocarbons produced in CH4-CO reaction over silica supported Rh, Ru and Pd catalysts at 573-723 K under atmospheric pressures, although CO2 was the main product, which was formed by the disproportionation of CO. Addition of H2 to CH4-CO reaction accelerated the rate of benzene formation several times, and the selectivity increased considerably.
A Catenated Cyclic Octamine: A Noncovalently Bonded Molecular System without Attractive Interaction between the Two Units
Authors: Takata Toshikazu , Shoji Junko , Furusho Yoshio 
Published: July 2004

Abstract
A novel [2]catenane consisted of two cyclic tetramine units (6) was prepared and characterized in terms of mobility of the units. The preparation of 6 was performed by reduction of the corresponding cyclic octamide-type [2]catenane (3) with borane. Varying temperature NMR study indicated that the units of 6 actually move or rotate quite freely unlike those of 3, evidently suggesting a noncovalently bonded molecule without attractive interaction1 between the two units.
The Formation of Monomethyl Carbonato-bridged Dinuclear Nickel(II) Complexes by an Efficient CO2 Uptake in Methanol Containing Urea Derivatives
Authors: Hosokawa Yoko , Yamane Heitaro , Nakao Yasuo , Matsumoto Keiji , Takamizawa Satoshi , Mori Wasuke , Suzuki Shinnichiro 
Published: July 2004

Abstract
Monomethyl carbonato-bridged dinuclear nickel(II) complexes [Ni2(L)(OOC-O-CH3)(CH3OH)2](ClO4)2·H2O·CH3OH, 1 and [Ni2(L)(OOC-O-CH3)(H2O)2](ClO4)2·H2O, 2 were obtained in the presence of [Ni2(L)(OH)(H2O)2](ClO4)2 and N-methylurea at room temperature in air, where HL is N,N,N′,N′-tetrakis[(1-ethyl-2-benzimidazolyl)methyl]- 2-hydroxy-1,3-diaminopropane. The crystal structure of 1 was determined by X-ray crystallography and 2 was characterized by the magnetic susceptibility and visible absorption spectrum.
Efficient and General Synthesis of Novel β-Polyfluoroalkoxy Vinamidinium Salts
Authors: Kase Koichiro , Katayama Mitsuyoshi , Ishihara Takashi , Yamanaka Hiroki , Gupton John T 
Published: July 2004

Abstract
Novel β-polyfluoroalkoxy vinamidinium salts 3 and/or 4 were synthesized in good yields by the reaction of N-(2-polyfluoroalkoxy-3,3-difluoro-1-propenyl)trimethylammonium iodides (2), prepared from N-(2,3,3-trifluoro-1-propenyl)trimethylammonium iodide (1), with secondary amines in MeCN at 70 °C for 1 h. The salts were also obtainable in comparable yields by the one-pot reaction of 1 with sodium polyfluoroalkoxide followed by treatment with amines.
Cyclic Oligo(thio-2,5-thienylenes) (Sulfur-bridged Calixarenes)
Authors: Nakayama Juzo , Katano Naoki , Sugihara Yoshiaki , Ishii Akihiko 
Published: July 2004

Abstract
Thiacalix[4]-, thiacalix[5]-, and thiacalix[6]arenes were synthesized by condensation of dibromo derivatives of the corresponding linear oligomers with Na2S. An X-ray diffraction analysis was performed on the last compound.
Construction of C60 Monolayer on the Water Surface
Authors: Yanagida Masami , Kuri Taishi , Kajiyama Tisato 
Published: July 2004

Abstract
A C60 monolayer was constructed on the water surface by the multi-step creep method for the first time. The surface morphology of the C60 monolayer was homogeneous and the C60 molecules in the monolayer were closely and regularly packed in hexagonal array.
Coupling of Oscillation with Transport Mediated by Polyoxyethylene p-Nonylphenyl Ether in Liquid Membrane System
Authors: Igawa Manabu , Otani Kazuyoshi , Horiguchi Shinpei , Okochi Hiroshi 
Published: July 2004

Abstract
Oscillation coupled with transport phenomena occurred in a liquid membrane system containing polyoxyethylene p-nonylphenyl ether under the concentration gradient of ethyl alcohol. The solutes of ethyl alcohol and some alkaline metal salts were transported without oscillation but their transport rates were enhanced by the periodical convection synchronous with the oscillation in this system.
Porphyrin Architectures Constructed by CH···π Interactions: Synthesis and Crystal Structures of 5,10,15,20-Tetrakis(4-methylchalcogenophenyl)-21H,23H-porphyrins
Authors: Sugiura Ken-ichi , Ushiroda Kantaro , Tanaka Takanori , Sawada Masami , Sakata Yoshiteru 
Published: July 2004

Abstract
Tetraphenylporphyrins substituted with methylchalcogeno groups (XMe: X = Te, Se, S, and O) were prepared. Crystal structure analysis revealed that a novel type of molecular alignments was achieved by intermolecular CH···π interactions between XCH3 and porphyrin π-systems.
New Analogs of the Pyripyropene Family of ACAT Inhibitors via α-Pyrone Fragmentation and γ-Acylation/Cyclization
Authors: Obata Rika , Sunazuka Toshiaki , Tian Zhiming , Tomoda Hiroshi , Harigaya Yoshihiro , Omura Satoshi , Smith Amos B 
Published: July 2004

Abstract
The pyridine moiety of pyripyropene A was replaced with other aromatic and heteroaromatic substituents via α-pyrone degradation followed by dienolate γ-acylation and in situ cyclization.
Synthesis and Characterization of Calcium Endohedral Fullerenes
Authors: Baopeng Cao , Zujin Shi , Xihuang Zhou , Zhennan Gu , Hongzhan Xiao , Jingzun Wang 
Published: July 2004

Abstract
The calcium endohedral fullerenes were synthesized by vaporizing the graphite anode filled with CaC2 grains with DC arc, extracted by CS2, and characterized by field desorption mass spectra. It is found that in the extract most fullerenes between C58 and C100 encapsulated one calcium atom and some trapped two calcium atoms inside. The results show that filling the graphite anode with CaC2 grains is more favorable to the formation of calcium endohedral fullerenes than filling with other materials.
Sandwiching Interaction of Peptides with a Porphyrin
Authors: Sugimoto Naoki , Nakano Shu-ichi 
Published: July 2004

Abstract
Designed oligopeptides were able to bind a porphyrin, 5,10,15,20-tetrakis (N-methylpyridinium-4-yl)-21H,23H-porphine; H2TMpyP with sandwiching interaction, and in this binding a position of aromatic residues and secondary structures of the peptides played an important role. The importance of the sandwiching interaction of the peptides was also indicated in the selection (combinatorial chemistry) of peptides binding H2TMpyP from a large number of peptide sequences.
Chiral Recognition in Disproportionation of Monoradical Cation of Optically Active Bisviologen in an Aqueous Solution
Authors: Tsukahara Keiichi , Abe Kaya , Matsuoka Maki 
Published: July 2004

Abstract
Optically active bisviologens, containing 1-(1-naphthyl)-, 1-phenyl-, and 1-cyclohexylethylamine, were synthesized. Disproportionation of monoradical trications produced by one-electron reduction occurred more easily in the (S,R)-isomers than in the (S,S)- and (R,R)-ones. The disproportionation is controlled by steric bulk of the chiral substituents in intramolecular association between two viologen radical units of diradical dications.
Tentative Structure of Molybdenum Oxycarbide
Authors: Oyama S T , Delporte P , Pham-Huu C , Ledoux M J 
Published: July 2004

Abstract
Scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), and selected area electron diffraction (SAED) are employed to deduce the atomic arrangement of defect molybdenum oxycarbide. The structure is built up of fcc cells of lattice constant 0.41 nm, with semi-ordered metal vacancies giving rise to a larger, 3-fold periodicity of 1.23 nm.
Synthesis and Ion Channel Formation of Novel Cyclic Peptides Containing a Non-natural Amino Acid
Authors: Ishida Hitoshi , Donowaki Kiyoshi , Inoue Yoshihisa , Qi Zhi , Sokabe Masahiro 
Published: July 2004

Abstract
A series of novel cyclic peptides possessing an alternate natural / non-natural amino acid sequence were prepared from l-alanine and 5-(N-acylamino)-3-aminobenzoic acid with a long acyl chain. Upon examination by the voltage clamp method, membranes composed of the synthetic cyclic peptides with varying ring sizes and side-chain lengths were found to form cation selective channels with a conductance of ca. 9 pS in aqueous KCl (500 mM).
Ligand Coupling Mechanism of Nucleophilic Vinylic Substitution of Iodonium Salts with Hypervalent 10-I-3 and 12-I-4 Intermediates
Authors: Okuyama Tadashi , Takino Tomoki , Sato Koichi , Ochiai Masahito 
Published: July 2004

Abstract
Reaction of 2-bromo-1-decenyl iodonium salt with bromide ion in acetonitrile results in nucleophilic substituion with complete retention. Observed rate constants show unexpected dependence on the bromide concentration, conforming with a mechanism involving ligand coupling within a bromoiodane 10-I-3 intermediate.
Lewis Acid Catalysis in Aqueous Media: Copper(II)-Catalyzed Aldol and Allylation Reactions in a Water-Ethanol-Toluene Solution
Authors: Kobayashi Shu , Nagayama Satoshi , Busujima Tsuyoshi 
Published: July 2004

Abstract
Cu(OTf)2 was found to be a stable Lewis acid in aqueous media and to activate carbonyl compounds effectively. Aldol reactions of silyl enol ethers with aldehydes and allylation reactions of tetraallyltin with carbonyl compounds proceeded smoothly in aqueous media, to afford the corresponding adducts in high yields. In addition, the catalyst could be easily recovered quantitatively after the reaction was completed and could be reused.
Extra-articular subtalar arthrodesis
Authors: Bourelle S. , Cottalorda J. , Gautheron V. , Chavrier Y. 
Published: July 2004

Of 23 children (35 feet) with cerebral palsy who had undergone a Grice extra-articular subtalar arthrodesis for a valgus hindfoot between 1976 and 1981, we reviewed 17 (26 feet), at a mean of 20 years (17 years 3 months to 22 years 4 months) after operation. Seven were quadriplegic, eight spastic diplegic, and two hemiplegic. They were all able to walk at the time of operation. Thirteen patients (20 feet) were pleased with the Grice procedure, 13 had no pain and 15 (23 feet) were still able to walk. The clinical results were satisfactory for most feet. Radiography showed that the results had been maintained over time but 14 feet developed a mean ankle valgus of 11° (6 to 18) with a compensatory hindfoot varus in 12 feet. No deformity of the talus or arthritis of adjacent joints was noted. The Grice procedure gives good long-term results in children with cerebral palsy.
Immobilisation after radiofrequency-induced shrinkage of tendon
Authors: Pötzl W. , Kümpers P. , Szuwart T. , Götze G. , Marquardt B. , Steinbeck J. 
Published: July 2004

Despite widespread use of radiofrequency (RF) shrinkage, there have been no animal studies on the effects of post-operative immobilisation on the histological properties of the shrunken tissue. We have therefore examined the role of post-operative immobilisation after RF shrinkage with special emphasis on the histological properties of collagenous tissue. One patellar tendon of 66 New Zealand White rabbits was shrunk. Six rabbits were killed immediately after the operation. Twenty rabbits were not immobilised, 20 were immobilised for three weeks and 20 for six weeks. Fibroblasts, collagen and vascular quality and density were evaluated on sections, stained by haematoxylin and eosin. Nine weeks after operation the histological properties were inferior to those of the contralateral control tendons. Shrunk tendons did not return to normal at any time after operation irrespective of whether the animals had been immobilised or not. All the parameters improved significantly between zero and three weeks after operation. Immobilised tendons tended to have a better and faster recovery. Careful rehabilitation is imperative after RF shrinkage. Immobilisation aids recovery of the histological properties. Our findings in this animal model support a period of immobilisation of more than three weeks.
Footballer’s hip
Authors: Saw T. , Villar R. 
Published: July 2004

We have reviewed a consecutive series of six professional footballers who presented with intractable hip pain which was attributed at arthroscopy, to an anterior acetabular labral tear with adjacent chondral damage. The location and type of labral tear were identical for each patient. There was no evidence of acetabular dysplasia. A variable area of chondral damage was associated with the labral tear. All unstable tissue was resected. Five returned to professional football at the highest level. Acetabular labral pathology should be included in the differential diagnosis of footballers with hip or groin pain. Arthroscopy of the hip is an appropriate method of diagnosis and treatment and minimises the length of rehabilitation required.
Alignment in total knee arthroplasty
Authors: Bäthis H. , Perlick L. , Tingart M. , Lüring C. , Zurakowski D. , Grifka J 
Published: July 2004

Restoration of neutral alignment of the leg is an important factor affecting the long-term results of total knee arthroplasty (TKA). Recent developments in computer-assisted surgery have focused on systems for improving TKA. In a prospective study two groups of 80 patients undergoing TKA had operations using either a computer-assisted navigation system or a conventional technique. Alignment of the leg and the orientation of components were determined on post-operative long-leg coronal and lateral films. The mechanical axis of the leg was significantly better in the computer-assisted group (96%, within ±3° varus/valgus) compared with the conventional group (78%, within ±3° varus/valgus). The coronal alignment of the femoral component was also more accurate in the computer-assisted group. Computer-assisted TKA gives a better correction of alignment of the leg and orientation of the components compared with the conventional technique. Potential benefits in the long-term outcome and functional improvement require further investigation.
High Performance Fibers
Authors: Polk Malcolm B. , Vigo Tyrone L. , Turbak Albin F. 
Published: June 2004

AbstractThe preparation, processing, and properties of high performance fibers are critically reviewed. The principal classes of high performance fibers discussed are those derived from rigid‐rod polymers, gel spun fibers, modified carbon fibers, carbon‐nanotube fibers, ceramic fibers, and synthetic vitreous fibers. Rigid‐rod polymers are derived from lyotropic liquid crystalline polymers, such as the aramid Kevlar or thermotropic liquid crystalline polymers, such as Vectran. These fibers are generally characterized by remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional fibers. Applications for these fibers are classified by structural aspects of the fiber, yarn, and fabric levels. Diversities in applications include uses in the aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas.
Creating Innovative Partnerships
Authors: Polo James F. , Rotchford Louise M. , Setteducati Paula M. 
Published: June 2004

AbstractThe Bell Atlantic Corporation has entered into an agreement with a consortium of community colleges in the Northeast for the purpose of offering an associate degree in applied science with a telecommunications concentration. The program, called NEXT STEP, is offered to Bell Atlantic employees during their workday. This specially designed degree program allows for a creative partnership between education, labor, and industry.
Effects of periodic flow fluctuations on magnetic resonance flow images
Authors: Uludag Yusuf , Powell Robert L. , McCarthy Michael J. 
Published: June 2004

AbstractThe effects of periodic velocity fluctuations on magnetic resonance flow images are investigated experimentally and theoretically. In the experiments, laminar pipe flow of water was examined. The flow was driven by a constant pressure head with a superimposed sinusoidal component with the frequency ωzvaried from 0 to 1 Hz, whereas in the simulations ωzwas between 0 to 65 Hz. The velocity profiles obtained from the experimental results compare well with the theoretical calculations. Both theory and experiment show that flow fluctuations produce artifacts in the form of “ghosts” of the primary image, which are spaced at equal intervals in the phase encoding (flow) direction. The distance between ghosts depends on the fluctuation frequency and on the experimentally specified parameters (phase encoding gradient step, repetition time, phase encoding duration, and time difference between phase encoding gradient lobes). The amplitudes of the ghosts depend on amplitude of the flow fluctuation and diminish at frequencies higher than 30 Hz. © 2004 American Institute of Chemical Engineers AIChE J, 50: 1662–1671, 2004