bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oxidative Addition Reactions Involving Molybdenum Polyhydrides
Authors: Ito Takashi 
Published: May 2005

Abstract
Versatile reactions of tetrahydridomolybdenum, [MoH4(dppe)2] (1, dppe = Ph2PCH2CH2PPh2), one of the typical polyhydrido complexes, are shown. It releases one or two moles of dihydrogen on irradiation or heating in solution to give a coordinatively unsaturated intermediate {MoH2(dppe)2} (A) and/or {Mo(dppe)2} (B) which reacts with (1) methacrylic esters to cause olefinic C–H bond activation, (2) allyl carboxylates to give an carboxylato-κ2O complex and propene as a result of C–O bond activation, (3) β-diketones and catechols to give chelated diketonato and catecholato derivatives, respectively, (4) cyclic imines and amides to cleave their N–H bonds to give N-acylamido complexes, or finally (5) aryl silanes to give a novel hydrido-silyl complex which has a quinquedentate ligand comprising a P∼P∼Si∼P∼P framework. The last complex was further investigated in view of the reactivity resulting from its unique structure. Most of these reaction products are characterized spectroscopically as well as by X-ray crystallography.
Positronium Annihilation in Fluorinated Benzene Derivatives
Authors: Hirata Kouichi , Kobayashi Yoshinori , Wang Cai-Lin 
Published: May 2005

Abstract
Positron lifetime measurements have been carried out to study formation and annihilation of ortho-positronium (o-Ps) in a series of fluorinated benzene derivatives. The o-Ps lifetimes (τ3) are longer than those expected from Tao’s empirical relationship for hydrocarbons, τ3−1 (ns−1) = 0.061σ0.5, where σ is the surface tension of the liquids in units of mN m−1. It was found that there is a rather good correlation between the o-Ps intensity I3 and the dipole moment for the fluorinated compounds.
Picosecond Energy Transfer at Gold/Electrolyte Interfaces Using Transient Reflecting Grating Method under Surface Plasmon Resonance Condition
Authors: Katayama Kenji , Sawada Tsuguo , Tsuyumoto Isao , Harata Akira 
Published: May 2005

Abstract
The energy transfer dynamics at gold/NaCl aq (0—0.5 M) interfaces was investigated using our recently developed surface plasmon resonance transient reflecting grating (SPR-TRG) method. We focused on two exponential decays in the SPR-TRG signals. The two decays correspond to the relaxation of hot electrons and interfacial heat transfer, respectively. The intensity of each decay changes systematically with increases in the concentration of NaCl, i.e., the former becomes smaller and the latter becomes larger. Considering the relation between the intensity and the dynamics, we concluded that there is some interaction between the hot electrons and the adsorbate on the interface and that the following temperature rise in gold after relaxation of the hot electrons becomes large. This conclusion shows that an ultrafast energy transfer processes by hot electrons exists, and that the process is hindered by the adsorbate. Finally, we discuss the ultrafast energy transfer in relation to the hot electrons and adsorbate on a molecular scale.
Electronic Spectra of Tetrafluorobenzene Cations Produced by Pulsed Glow Discharge in a Supersonic Free Jet
Authors: Nibu Yoshinori , Fujii Noriaki , Shimada Hiroko 
Published: May 2005

Abstract
Cold ions of tetrafluorobenzene isomers were produced by pulsed glow discharge in a supersonic free jet and the electronic spectra due to D2–D0 transitions were observed. The vibrational frequencies of the ions were determined for the ground and electronically excited states through observations of the fluorescence excitation and dispersed fluorescence spectra under collision-free conditions. The vibronic bands observed in the spectra were assigned to totally symmetric vibrations. The difference in the vibrational frequencies between the ion and neutral molecules is very small in spite of the ejection of an electron from the π orbital. A very small frequency change is observed in the electronic excited state of the ions. The frequencies observed for the ions show that the bonding π orbitals are less effective for chemical bonds of the molecules. The electronic spectra of the 1,2,4,5-tetrafluorobenzene cation, whose neutral parent molecule is distorted in the S1 state along the fluorine-wagging normal mode, gave no sign of such a structural change in the electronic excited D2 state.
A Simple Method for Enumeration of Non-Rigid Isomers. An Application of Characteristic Monomials
Authors: Fujita Shinsaku 
Published: May 2005

Abstract
A new and simple procedure for counting isomers derived from non-rigid parent molecules has been developed by the combination of the promolecule concept with the characteristic-monomial method. This procedure has been applied to the enumeration of diphenylmethanes, 2,2-diphenylpropanes, and 2,2-dimethylpropanes, after the characteristic monomial tables for the point groups C2v and C3v have been prepared.
Complex Formation between Cationic Surfactants and Insoluble Drugs
Authors: Iimura Nahoko , Sawada Keiju , Ohashi Yuji , Hirata Hirotaka 
Published: May 2005

Abstract
Water-insoluble drugs, 1-(2,4,6-trihydroxyphenyl)-1-propanone (flopropione) and 4-chloro-m-cresol, formed crystalline complexes with cationic surfactants, such as hexadecyl-, tetradecyl-, dodecyl-, and decyltrimethylammonium bromides, in a solubilized solution system when the solutions were kept at temperatures lower than 288 K and the solubilities of the crystalline complexes were significantly greater than those of only the drugs. Moreover, the complex crystals were more thermostable than only the drugs. The crystal structures of three complexes (4-chloro-m-cresol and hexadecyltrimethylammonium bromide (I), flopropione and tetradecyltrimethylammonium bromide (II), and flopropione and hexadecyltrimethylammonium bromide (III)) were analyzed by the X-ray diffraction method. These complexes were composed of the surfactant and drug molecules in a ratio of 1 : 1 (III) or 2 : 1 (I or II). In each crystal, the drug molecule was sandwiched by the alkyl chains of the surfactant molecules; the hydroxy group of the drug made a hydrogen bond with the bromide anion. Those structural characteristics were similar to those of the complexes between the surfactants and aromatic compounds. Such intermolecular interactions were responsible for the increased solubility and thermal stability of the complex.
Hydrogen Insertion on Alkali Metal Decamolybdates by Spillover
Authors: Eda Kazuo , Ito Takayoshi , Sotani Noriyuki 
Published: May 2005

Abstract
A hydrogen-insertion process by spillover on alkali metal decamolybdates was investigated in situ. Hydrogens were inserted, leading to the formation of OH groups. The insertion induced dehydration (release of the crystallization water of the molybdates), which resulted in distortions in the Mo–O framework. The dehydration behaviour varied depending on the kinds of decamolybdates or the manners in which the decamolybdates have crystallization-water species. Furthermore, structural changes of the resultant compounds with heat-treatments in N2 were also investigated. It was then confirmed that these compounds could become starting materials, leading to the formation of alkali metal molybdenum bronzes at lower temperatures, ca. 200 K below those used in ordinary syntheses.
The Response Behavior of PAA–B12C4 Electrode to Li+, Mg2+, and Ca2+ in Some Aprotic Solvents and Its Thermodynamic Application
Authors: Nakamura Toshio , Makino Kaori , Yanagisawa Masashi , Miyasaka Takahiro 
Published: May 2005

Abstract
The potentiometric response behavior of an electrode, which consists of a non-plasticized carboxyl-modified polyacrylamide polymer (PAA) coupled to benzo-12-crown-4 (PAA–B12C4) to Li+, Mg2+, and Ca2+ in such aprotic solvents as acetonitrile (AN), propylene carbonate (PC), and γ-butyrolactone (GBL), were examined. The electrode showed a Nernstian response to Li+ and Ca2+ in AN, and Li+, Mg2+, and Ca2+ in PC and a near-Nernstian response to Mg2+ in GBL. From the response to Ca2+ it could be confirmed that the membrane potential was mainly established at the polymer membrane–solution interface. The electrode was applied to a study of their complexing with such other basic aprotic solvent molecules (D) as N,N-dimethylformamide, dimethyl sulfoxide, and hexamethylphosphoric triamide. The successive complex formation constants (βi) and Gibbs energies of transfer (ΔGtr(j)) of Li+ in AN and Mg2+ in PC in relation to such D were obtained.
Efficient Oxygen Consumption by Hydroxo(protoporphyrinato)iron(III) Adsorbed on Magnesium Oxide Powder in the Presence of Cysteine
Authors: Noda Hiroyuki , Ohya Hiroaki , Kamada Hitoshi 
Published: May 2005

Abstract
The oxygen reduction ability of hydroxo(protoporphyrinato)iron(III) (HEM) adsorbed on powdery supports in the presence of cysteine was investigated using a Clark-type oxygen electrode. All of the oxygen consumption rates for HEM adsorbed on powdery supports having different surface basicity values (CaO &gt; MgO &gt; TiO2) were larger than the cases of HEM in aqueous solution and of MgO suspension without HEM in the presence of cysteine. Maximum oxygen consumption rate was obtained in the case of the HEM/MgO system. This result suggests that the optimum surface basicity of powdery support is necessary to achieve efficient oxygen consumption. From the measurements for ESR and Raman spectra of the HEM/MgO system, we confirmed the change for the iron valence of HEM from III to II in the presence of cysteine. The production of cystine through the dimerization of cysteinyl radicals in the reaction mixture was also confirmed by the measurements of ESR spectra and capillary electrophoresis (CE). A possible mechanism for accelerating the oxygen consumption rate of the HEM/MgO system in the presence of cysteine is discussed, concerning the effect of the catalytic ability of MgO on the turnovers of iron valence.
Room-Temperature Metallation of 2-Substituted 1,3-Dithiane Derivatives and Subsequent Coupling with 2,3-Disubstituted Oxiranes
Authors: Ide Mitsuaki , Nakata Masaya 
Published: May 2005

Abstract
2-Substituted 1,3-dithiane derivatives, (S)-1-(t-butyldiphenylsiloxy)-2-(1,3-dithian-2-yl)propane (9), (S)-1-(t-butyldimethylsiloxy)-2-(1,3-dithian-2-yl)propane, 1-(t-butyldiphenylsiloxy)-2-(1,3-dithian-2-yl)-2-methylpropane, and 1,2-bis(t-butyldiphenylsiloxy)-3-(1,3-dithian-2-yl)propane, were subjected to lithiation in THF with n-BuLi at room temperature (r.t.); the resulting anions reacted with 2,3-disubstituted oxirane, trans-2-methyl-3-(triphenylmethoxymethyl)oxirane (22), at r.t., giving the coupling products in satisfactory yield. On the other hand, the lithium salt formed in ether from (S)-2-(1,3-dithian-2-yl)-1-(4-methoxybenzyloxy)propane with n-BuLi at r.t. reacted with 22 at r.t. in the presence of hexamethylphosphoric triamide to afford the coupling product in moderate yield. In addition, a mixed organometallic reagent, n-BuLi / Bu2Mg, was found to be an effective metallation reagent for 9 and the resulting anion reacted with 22 to afford the coupling product in good yield.
Practical Synthesis of Four Stereoisomers of 6-(t-Butyldiphenylsiloxy)-3,5-dimethyl-1-(triphenylmethoxy)hexane-2,4-diol via Dithiane Coupling with Oxirane
Authors: Ide Mitsuaki , Tsunashima Keiji , Nakata Masaya 
Published: May 2005

Abstract
The anion derived from 2-substituted 1,3-dithiane derivative, (S)-2-[2-(t-butyldiphenylsiloxy)-1-methylethyl]-1,3-dithiane, with n-BuLi at room temperature (r.t.) in THF was subjected to coupling with 2,3-disubstituted oxirane, (2S,3S)- or (2S,3R)-2,3-epoxy-1-(triphenylmethoxy)butane, at r.t., giving the coupling products in satisfactory yield. These coupling products were subjected to de-dithioacetalization, and the resulting carbonyl compounds were stereoselectively reduced to afford four stereoisomers of 6-(t-butyldiphenylsiloxy)-3,5-dimethyl-1-(triphenylmethoxy)hexane-2,4-diol.
Oxidation of 2-Substituted Cycloalkanones with Cerium(IV) Sulfate Tetrahydrate in Alcohols and Acetic Acid
Authors: He Liangyou , Horiuchi C Akira 
Published: May 2005

Abstract
The reaction of 2-substituted cycloalkanones with cerium(IV) sulfate tetrahydrate (CS) in alcohols and acetic acid gave the corresponding alkyl esters of oxo acids (80—96%) and oxo acids (78—96%), respectively, by oxidative cleavage of the C(R)–C=O bond. In the case of 2-iodocycloalkanones in methanol, the dimethyl ester was obtained in good yield. A treatment of 5α-cholestan-3-one with CS in methanol produced 2-acetal 3-ester of 2,3-seco derivative in good yield. The effects of cerium(IV) and copper(II) salts are also discussed.
Syntheses and Properties of Novel Liquid Crystals Containing a Trifluoromethylamino Group
Authors: Kanie Kiyoshi , Mizuno Katsuya , Kuroboshi Manabu , Takehara Sadao , Hiyama Tamejiro 
Published: May 2005

Abstract
Liquid crystals (LCs) containing a trifluoromethylamino group are prepared by the cross-coupling reaction of p-bromo-substituted-(hetero)aryl(trifluoromethyl)amines that are derived from the corresponding dithiocarbamates through oxidative desulfurization–fluorination. The novel LCs are shown to exhibit mainly a smectic phase over a wide range of temperatures. Their electro-optical properties as a component of nematic LCs are compared with those of the corresponding methylamines.
Imine-Forming Radical Elimination Reactions of O-(1-Naphthoyl)-N,N-bis(p-substituted benzyl)hydroxylamines Activated by Triplet Benzophenone
Authors: Andoh Fumihiko , Kubo Kanji , Sakurai Tadamitsu 
Published: May 2005

Abstract
It was shown that despite the occurrence of a diffusion-limited triplet energy transfer between the title hydroxylamine 1 and benzophenone, triplet 1 decomposed inefficiently giving p-substituted N-(p-substituted benzylidene)benzylamine 2 and 1-naphthoic acid (3) as unimolecular radical elimination products. The logarithm of the kr/kd ratio (where kr is the rate constant for homolytic cleavage of the N–O bond in triplet 1 and kd is that for its deactivation) used as a measure of the triplet-state reactivities of 1, showed a negligible dependence on the substituent constant. This finding was explained in terms of a very small contribution of the ionic structure to the transition state for the N–O bond homolysis.
Decarbonylation Reaction of 1-Azulenecarbaldehydes under Mild Conditions. A Strategy for the Protection of 1- and/or 3-Position of Azulene Rings
Authors: Ito Shunji , Morita Noboru , Asao Toyonobu 
Published: May 2005

Abstract
The reaction of 1-azulenecarbaldehydes 9a and b with pyrrole (8) in acetic acid resulted in decarbonylation to afford azulenes even at room temperature in 49 and 78% yields, respectively. 1,3-Azulenedicarbaldehydes also reacted with 8 to give azulenes in 36 and 52% yields, respectively. This decarbonylation reaction was adopted to the selective synthesis of 3,3′-unsubstituted di(1-azulenyl)methane derivatives 7a—d. Acid-catalyzed condensation of 9a and b with paraformaldehyde or benzaldehyde afforded 3,3′-methylenedi(1-azulenecarbaldehyde)s, following this decarbonylation reaction gave the desired 7a—d as a sole product in 33—59% yields starting from 9a and b. Such decarbonylation is because of the ability of protonation of azulene ring in acidic condition and because of electron-donating properties of pyrrole ring. This reaction would serve as a new strategy for the protection of 1- and/or 3-positions of azulene ring.
The Reaction of Nitrile Oxide-Quinone Cycloadducts. III. Reinvestigation of the Base-Induced Isomerization of the 1 : 1 -C=C-Adducts of Aromatic Nitrile Oxides with 2,5- and 2,6-Dialkyl-Substituted p-Benzoquinones
Authors: Mukawa Takashi , Inoue Yukihiko , Shiraishi Shinsaku 
Published: May 2005

Abstract
The structure of the product obtained by the base-induced isomerization of the 1,3-dipolar cycloadduct of 2,5-di-t-butyl-p-benzoquinone with 2,6-dichlorobenzonitrile oxide was determined by X-ray analysis. The t-butyl group at the bridgehead position of the 1,3-dipolar cycloadduct migrated to the neighboring carbonyl carbon atom. This base-induced rearrangement took place with a bulky group, i. e., Et, i-Pr, t-Bu, and Bn at the bridgehead position of nitrile oxide-quinone cycloadducts in an alcoholic media. The driving force of this reaction is considered to be due to stabilization by aromatization from isoxazoline derivatives to isoxazole-fused p-quinol derivatives.
Processing and Performance of Electric Double-Layer Capacitors with Block-Type Carbon Nanotube Electrodes
Authors: Ma Renzhi , Liang Ji , Wei Bingqing , Zhang Bin , Xu Cailu , Wu Dehai 
Published: May 2005

Abstract
Two kinds of block-type porous materials of carbon nanotubes were fabricated. One was fabricated by hot-pressing without any binding materials, the other was synthesized through carbonization of a cured mixture of carbon nanotubes and phenol-formaldehyde resin. The specific surface area and total volume of the open pores were measured. Both are suitable for fabricating polarizable electrodes of electric double-layer capacitors (EDLCs). In addition, the block-type carbon nanotube electrodes enable one to fabricate a box-type cell. A cell with large capacitance, 150 F at 1.0 V, was developed by using sulfuric acid as the electrolyte.
Profiles of Carbon Dioxide Decomposition in a Dielectric-Barrier Discharge-Plasma System
Authors: Matsumoto Hiroshige , Tanabe Shuji , Okitsu Kenji , Hayashi Yuji , Suib Steven L 
Published: May 2005

Abstract
Decomposition of CO2 to CO and O2 in Ar stream has been investigated under atmospheric pressure by the use of a dielectric-barrier discharge plasma reactor. CO2 dissociation was found to proceed in accordance with the stoichiometry of 2 CO2 = 2 CO + O2 at considerable rates, which increased with increasing the input voltage, the CO2 concentration in Ar, and the heat of oxide formation of the corresponding metallic component used as the electrode. From kinetic and spectroscopic measurements, the major pathway of CO2 decomposition was speculated to be promoted by a synergetic effect between plasma excitations in the gas phase and catalytic actions of the electrode surface.
Metallo-Regulation of DNA Triple Helix Formation through Cooperative Dimerization of Two Oligonucleotides
Authors: Sueda Shinji , Ihara Toshihiro , Takagi Makoto 
Published: May 2005

Abstract
The DNA binding affinity of oligonucleotide carrying iminodiacetic acid (IDA) group is regulated by metal ion through cooperative dimerization mediated by formation of 2:1 complex of IDA with metal ion.
A Novel Organic Peroxyester as an Exclusive Source of tert-Butyl Radicals
Authors: Nakamura Tomoyuki , Watanabe Yasumasa , Tezuka Hiroshi , Busfield W Ken , Jenkins Ian D , Rizzardo Ezio , Thang San H , Suyama Shuji 
Published: May 2005

Abstract
A novel peroxyester, 1,1,2,2-tetramethylpropyl peroxypivalate 1b, has been synthesized and thermolyzed in cumene. The kinetic data show that the decomposition rate constant of 1b is about three times higher than that of tert-butyl peroxypivalate. The radical trapping technique employing 1,1,3,3-tetramethyl-2,3-dihydro-1H-isoindol-2-yloxyl has been used to study the decomposition mechanism of 1b. The results show that the thermolysis of 1b in cumene generates tert-butyl radicals exclusively.
Mössbauer Spectra of FePS3 and Its Intercalation Compounds
Authors: Sakai Hiroshi , Yamazaki Takashi , Shigematsu Toshihiko , Nakashima Satoru , Hinomura Tooru , Nasu Saburo 
Published: May 2005

Abstract
We succeeded in preparing FePS3 intercalated with pyridine and allylamine. In the XRD patterns of the intercalates the diffraction peaks corresponding to FePS3 were completely missing. The Mössbauer spectra are changed significantly by the intercalation, suggesting the charge transfer from guest molecules to the host matrix.
Direct Measurements of Stretching Force-Chain Ends Elongation Relationships of a Single Polystyrene Chain in Dilute Solution
Authors: Kikuchi Hirotsugu , Yokoyama Noritaka , Kajiyama Tisato 
Published: May 2005

Abstract
Mechanical stretching characteristics of a single polystyrene chain in a dilute solution was investigated with atomic force microscope. An entropic elasticity expressed by the extended Langevin function was observed in a force range below 200 pN and an extension range below 60 nm.
Extremely Efficient Catalysis of Immobilized Lipase in Ring-opening Polymerization of Lactones
Authors: Uyama Hiroshi , Suda Sakae , Kikuchi Hirofumi , Kobayashi Shiro 
Published: May 2005

Abstract
An immobilized lipase derived from Candida antarctica was used as catalyst for the ring opening polymerization of lactones. A small amount of the immobilized enzyme showed the extremely efficient catalysis in the lactone polymerization. The polymerization in the presence of 1-octanol enhanced the rate of reaction.
Thermally Responded Self-Aggregation of Ultrafine Particles Prepared by Modification of Monodisperse Colloidal Silica with Iron(II)-Bipyridyl Branched Polymer
Authors: Yoshinaga Kohji , Sasao Yoshiro 
Published: May 2005

Abstract
Monodisperse colloidal silica particles modified by Fe(II)-bipyridyl complex-branched, N-isopropylacrylamide-contained polymer showed self-aggregation via the ligand exchange among the particles in response to temperature elevation from 15 °C to 35 °C.
Preparation of Thick Inorganic-organic Composite Films by Electrophoretic Sol-gel Deposition Using Organically Modified Silica Particles and Polyethylene Maleate
Authors: Hasegawa Koichi , Kunugi Shunsuke , Tatsumisago Masahiro , Minami Tsutomu 
Published: May 2005

Abstract
Thick inorganic-organic composite films composed of organically modified silica particles and polyethylene maleate were prepared by electrophoretic sol-gel deposition. The optimum amount of polyethylene maleate added was 1 mass% and that of ammonia water was 1 mass% to obtain thick films of ca. 20 μm in thickness with no open spaces among the particles.
Signal Transduction against the Terpenoid-Stimulation in the Liverwort Cells
Authors: Izumi Shunsuke , Hirata Toshifumi 
Published: May 2005

Abstract
Addition of bornyl acetate to the cultured cells of Marchantia polymorpha caused a rapid increase of H2O2 and cAMP in the intracellular level. cAMP agonist (Sp-cAMPS) activated the H2O2 formation, while cAMP antagonist (Rp-cAMPS), protein kinase A inhibitor H-89, and Ca2+ ions inhibited the H2O2 formation.
Beneficial Effect of Carbon Dioxide in Dehydrogenation of Ethylbenzene to Styrene over Zeolite-Supported Iron Oxide Catalyst
Authors: Chang Jong-San , Park Sang-Eon , Park Min Seok 
Published: May 2005

Abstract
In dehydrogenation of ethylbenzene with carbon dioxide over zeolite-supported iron oxide catalyst, ethylbenzene was predominantly converted into styrene by an oxidative manner. Carbon dioxide in this reaction played a role as an oxidant to greatly improve catalytic activity as well as coke resistance of catalyst.
Real Time Observation of Decomposition of Methanol on Ru(001)-p(2 × 2)-O by a Temperature Programmed ESDIAD/TOF System
Authors: Sasaki Takehiko , Itai Yuichiro , Iwasawa Yasuhiro 
Published: May 2005

Abstract
For the purpose of utilizing ESDIAD (Electron Stimulated Desorption Ion Angular Distribution) as a real time probe for surface chemical processes, we have developed a new instrument which can measure ESDIAD images and time of flight (TOF) spectra of desorbed ions in temperature programmed surface processes. TOF measurements are carried out to identify the mass of desorbed ions and to determine their kinetic energy distribution. This temperature-programmed (TP)-ESDIAD/TOF system was used to observe the decomposition processes of methanol on Ru(001)-p(2 × 2)-O. A halo pattern from the methyl group of methoxy species was observed at 100-200 K by the use of CH3OD, followed by a broad pattern from the methyl group at 230-250 K, and by a near-center pattern from the oxygen atom of CO above 300 K.