bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ion-Molecule Reactions in Carbonyl Sulfide–Hydrocarbon Mixtures
Authors: Matsumoto Akira , Okada Satoshi , Misaki Toshiyuki , Taniguchi Setsuo , Hayakawa Teruo 
Published: July 2006

Abstract
Thermal energy ion-molecule reactions in carbonyl sulfide–hydrocarbon (methane, acetylene and propylene) mixtures were studied using a mass spectrometer equipped with a pulsed ion source. The rate constants for sulfur atom transfer, sulfur ion transfer and sulfur ion addition reactions were measured.
The Mechanism of the Selective Hydrogenation of 1,3-Butadiene on Copper Surfaces
Authors: Nishimura Eiji , Inoue Yasunobu , Yasumori Iwao 
Published: July 2006

Abstract
The hydrogenation of 1,3-butadiene on copper surfaces was studied in detail. A highly selective formation of 1-butene was observed in the range of temperatures from 27 to 76 °C; the initial rate of the formation was well expressed in terms of the partial pressures of hydrogen, ph and butadiene, ph, as v=kph⁄(1+Kpb)2 in the pressure range of 5–100 Torr. The reaction with D2 gave butene-d0 and -d1 as the main products, and the butadiene was partly exchanged with D2 during the hydrogenation. The microwave spectroscopic analysis revealed that the 1-butene produced consisted of CH2=CHCH2CH2D, CH2=CHCHDCH3, and CHD=CHCH2CH3, without even a trace of CH2=CDCH2CH3. Therefore, it was concluded that the reaction proceeds via the isobutenyl surface intermediate and that the dissociative adsorption of hydrogen is rate-determining. The structural analysis of the surface suggested that the stable lattice planes, such as (111), (100)3, and (110), are responsible for the reaction. The origin of the high 1-butene selectivity was discussed on the basis of the surface geometry and the proposed mechanism.
The Mechanism of the Hydrolysis of Condensed Phosphates. II. The Mechanism of the Degradation of Long-chain Polyphosphates
Authors: Watanabe Makoto , Sato Shoji , Saito Hajime 
Published: July 2006

Abstract
The hydrolysis of long-chain polyphosphates (Graham’s salt) was carried out in water and dioxane-water solvents at various pHs in the range from 3.0 to 11.0 and at 30, 50, and 70 °C. The rates of the hydrolytic degradation of the polyphosphates into shorter chains and into trimetaphosphate obeyed the first-order kinetics with respect to the concentration of the polyphosphates. In acidic media, a small solvent effect was perceived on the rates of both the processes. On the other hand, in basic media the effect was very remarkable; that is, the rates of both the processes in the dioxane-water solvent were more rapid than in water. The results show that the rate of the hydrolysis of both the processes in basic media may be very dependent on the step of the nucleophilic attack of a water molecule on the phosphorus atom of phosphates, while in acidic media other factor, for example, the folding of the chains to a helix, may affect the overall rate. The activation energies for the two processes have been found to be 22–26 kcal/mol in the pH range from 3.0 to 7.0.
The Photochemical Reaction of Benzo[c]cinnoline. I. The Photoreduction and Subsequent Reactions in Acidified Alcohols
Authors: Inoue Hiroyasu , Sakurai Tetsuo , Tanaka Fujio 
Published: July 2006

Abstract
The photoinduced reaction of benzo[c]cinnoline (BCC) in strongly acidic aqueous alcohols, in which BCC exists in a monoprotonated form (BCCH+), was investigated. The initial step of the photoreaction was the hydrogen abstraction, which gave rise to 5,6-dihydroBCCH+, irrespective of the excitation wavelengths and the kind of alcohol (methanol, ethanol, or 2-propanol) used as a solvent. The subsequent reaction occurred upon irradiation by a light longer than 400 nm to afford 2,2′-diaminobiphenyl in ethanol, but not in methanol and 2-propanol. The 1-hydroxyethyl radical formed in the initial photoreduction appeared to participate in this reaction, donating its hydrogen atom to the ground-state 5,6-dihydroBCCH+. On the other hand, ultraviolet irradiation caused the subsequent photoreaction of 5,6-dihydroBCCH+, thus giving carbazole accompanied by the liberation of ammonia.
Photochemistry in the Adsorbed Layer. III. Photolysis of Acetone Adsorbed on Porous Vycor Glass
Authors: Anpo Masakazu , Hirohashi S\={o}zi , Kubokawa Yutaka 
Published: July 2006

Abstract
Photolyses of acetone adsorbed showed that the ratio of ethane to methane in the products as well as the kinetic isotope effect for the methane formation is much smaller than that in the gas phase photolysis. The methane formed from acetone-d6 contains a considerable amount of CD3H. Ethane formation is quenched more efficiently by nitric oxide than methane formation. It is proposed that there are two types of methyl radicals, i.e., long- and short-lived ones, the ethane resulting from the long-lived radicals. The results suggest that methane arises from hydrogen abstraction from surface OH groups as well as disproportionation reaction CH3+CH3CO→CH4+CH2CO, in addition to hydrogen abstraction from acetone molecules.
Reactions of Perfluoro-2-methyl-2-pentene and Octafluoroisobutylene with Arylamines
Authors: Ishikawa Nobuo , Nagashima Akira 
Published: July 2006

Abstract
Treatment of perfluoro-2-methyl-2-pentene with four moles of arylamine provided 1-aryl-2,4-bis(arylimino)-3-(1-arylimino-2,2,3,3,3-pentafluoropropyl)azetidine, 3-(N,N′-diarylamidino)-4-arylamino-2-(pentafluoroethyl)-quinoline and 2,4-bis(arylamino)-3-(1-arylimino-2,2,3,3,3-pentafluoropropyl)quinoline, depending on the basicity of the arylamine and on the solvent used. Octafluoroisobutylene also yielded similar azetidine and quinoline derivatives.
Comments on the Energy Calibration in X-Ray Photoelectron Spectroscopy
Authors: Kinoshita Shuichi , Ohta Toshiaki , Kuroda Haruo 
Published: July 2006

Abstract
The change of the contact potential difference between the sample and spectrometer was examined on the adsorbed carbon/Au system by observing the low kinetic energy limit of the X-ray photoelectron spectrum. Discussions are given on the use of the contamination carbon for energy calibration.
The Crystal Structures of Sterigmatocystin and O-Methylsterigmatocystin, Metabolites of the Genus Aspergillus
Authors: Fukuyama Keiichi , Hamada Kensaku , Tsukihara Tomitake , Katsube Yukiteru , Hamasaki Takashi , Hatsuda Yuichi 
Published: July 2006

Abstract
The crystal and molecular structures of sterigmatocystin and O-methylsterigmatocystin have been studied by the X-ray diffraction method. Both compounds crystallized in the space group P21 with Z=2. The cell dimensions are a=16.068, b=4.293, c=11.243 Å, and β=113.23° for sterigmatocystin, and a=8.835, b=16.769, c=5.403 Å, and β=109.21° for O-methylsterigmatocystin.
Phosphinidenes and Related Intermediates. V. Reactions of Phosphinylidenes with cis- and trans-Stilbene Oxides
Authors: Nakayama Shigenobu , Yoshifuji Masaaki , Okazaki Renji , Inamoto Naoki 
Published: July 2006

Abstract
Reactions of phenyl- and cyclohexylphosphinylidenes with trans-stilbene oxide gave trans-stilbene and 4-hydroxybutyl 2-hydroxy-l,2-diphenylethyl phosphonate derivatives. In the case of cyclohexylphosphinylidene, 2-cyclohexyl-3,4-diphenyl-1,2-oxaphosphetane 2-oxide was also formed. Reactions with cis-stilbene oxide gave cis-and trans-stilbenes.
Metal Phosphinylides and Phosphinothioylides. VI. Some Observations in Reactions of Diphenylphosphinic Chloride with Tetrahydrofuran in the Presence of Metal Chlorides
Authors: Goda Koshiro , Inamoto Naoki 
Published: July 2006

Abstract
31P-NMR data showed a formation of a stable 1 : 1 complex between diphenylphosphinic chloride (1) and aluminum chloride. The effect of common chloride ion on the reaction of 1 with tetrahydrofuran in the presence of zinc or cuprous chloride supported a cationic mechanism in the former case, and no free radical but homolytic mechanism in the latter.
An Analytical Study of pre-Inca Pigments, Dyes, and Fibers
Authors: Kashiwagi K Maresuke 
Published: July 2006

Abstract
The total analysis of 800-year-old Peruvian pigments with regard to the inorganic elements was carried out; some typical pigments, like mercury sulfide and iron oxide, are shown. Some characteristic pre-Inca (6–7 th century Tiahaunaco and 13–14 th century Chancay) dyes including cochineal, indigo, and probably logwood were identified from old fabrics by means of absorption spectroscopy and also chromatographic analysis. Two kinds of fiber constituting those fabrics were also investigated, and a few chemical analyses, including that of the amino-acid composition of protein fiber and that of the extent of the degradation of old cellulose fiber, were made.
Formation Constants of Dibenzo-18-crown-6 Complexes with Alkali Metal Ions in DMSO, DMF, and PC at 25°C
Authors: Matsuura Niro , Umemoto Kisaburo , Takeda Yasuyuki , Sasaki Atsuko 
Published: July 2006

Abstract
The formation constants (Kf) for the 1 : 1 complexes of dibenzo-18-crown-6 (DBG) with alkali metal ions in DMSO (dimethyl sulfoxide), DMF (N,N-dimethyl formamide), and PC (propylene carbonate) have been determined conductometrically. The formation constant sequences of the alkali metal ions with DBG in DMSO, DMF, and PC are K+&gt;Rb+&gt;Cs+≅Na+&gt;&gt;Li+, K+&gt;Rb+&gt;Cs+&gt;Na+&gt;Li+, and K+&gt;&gt;Na+&gt;Rb+&gt;Cs+&gt;Li+ respectively. The Kf value series about the same alkali metal ion among these nonaqueous solvents are given in the order of DMSO&lt;DMF&lt;PC. These results show that the selectivity of DBC toward the alkali metal ions is dependent on the ionic diameter and the ring-hole size of DBC, and that the donor number of the organic solvent as a component factor is important in determining the process of the formation of the DBC complexes constant.
Theoretical Calculations of the Raman Intensities by the Vibronic Method. II. The In-plane Vibrations of Ethylene
Authors: Shinoda Hiroyuki 
Published: July 2006

Abstract
The values of the transition moment of Raman scattering have been calculated according to the formula derived from the vibronic method. The calculations have been performed for the in-plane vibrational modes of ethylene determined by three different sets of force constants. The electronic wave functions were calculated by the CNDO/2-CI method. From the relative Raman intensities of three A1g-vibrations of ethylene in the respective cases, it was found that the Raman intensities are sensitive to the vibrational modes. Also, the Raman intensities of ethylene were calculated by the polarizability method in order to compare the results with those obtained from the vibronic method. From the results of these calculations, the conclusions of the previous work have been confirmed.
The Crystal and Molecular Structure of Silver(I) N,N-Diethyldithiocarbamate
Authors: Yamaguchi Hiroko , Kido Azuma , Uechi Tetsuo , Yasukouchi Kazuo 
Published: July 2006

Abstract
The crystal structure of silver (I) N,N-diethyldithiocarbamate was determined by the X-ray diffraction method. The crystals are monoclinic, with the space group P21/c, and with two hexameric molecules in a unit cell with dimensions of a=10.90±0.02, b=24.72±0.01, c=11.51±0.02 Å, and β=125.8±0.1°. The structure was solved by a heavy-atom method and was refined by block-diagonal least-squares methods to a final R-value of 0.029 for 2108 observed reflections. The structure consists of hexameric molecules, [AgS2CN(C2H5)2]6. The hexameric structure was essentially consistent with Hesse’s preliminary result (1960). The terminal silver atom in one molecule is bridged by a sulfur atom to that in the adjacent hexamer, forming a chain structure along the a axis. All the silver atoms are connected to five atoms (either 1Ag and 4S or 2Ag and 3S). The dithiocarbamate ligands are classified into three types: bidentate, intra-, and inter-molecule tetradentate.
Lanthanide Induced Shifts of the PMR Spectra of Polyaza-aromatic Compounds
Authors: Nagawa Yoshinobu , Ono Makoto , Hirota Minoru , Hamada Yoshiki , Takeuchi Isao 
Published: July 2006

Abstract
The LIS’s were determined with the equimolar mixtures of two monoaza-aromatic compounds, and the relative coordinating ability of each ligand was estimated from these LIS’s. The coordinating ability index is defined as the ratio of the complexed species of the monoaza-aromatics to that of pyridine, and is proved to be transferable to the nitrogen atom of similar steric circumstances. Thus, Eu(fod)3 induced shifts of the protons in several unsymmetrical naphthyridines and related heterocycles were estimated by the sum of the induced shifts of the corresponding monofunctional equivalents weighted by the relative abundances of the complexed species which were obtained from the coordinating ability measurements. The method is applicable to other bifunctional compounds of rigid conformation.
Charge-transfer Interaction in Supercooled Melts of Some Derivatives of N-Picrylaniline
Authors: Matsunaga Yoshio 
Published: July 2006

Abstract
Supercooled melts of N-picrylaniline and its derivatives, the molecules of which consist of electron-donating and -accepting moieties, are colored more deeply than the crystals. Many of them exhibit glass transitions.
Ultrasonic Absorption Mechanism in an Aqueous Solution of Isopropyl Alcohol
Authors: Nishikawa Sadakatsu , Mashima Mitsuo , Yasunaga Tatsuya 
Published: July 2006

Abstract
Ultrasonic absorption measurements in an aqueous solution of isopropyl alcohol were made in the frequency range from 5 to 220 MHz and in the concentration range from 3 to 10 M. The excess absorption which is characteristic of a single relaxation process was observed. The mechanism of the excess absorption was interpreted in terms of a reaction expressed by AB\ightleftharpoonsA+B, where A and B are monomeric molecules of alcohol and water respectively. The rate constants for forward and backward reactions were determined from the concentration dependences of the relaxation frequencies. The results obtained were compared with those of aqueous solutions of other alcohols which had already been published.
The Crystal Structure of Bis[1-(2-thiazolylazo)-2-naphtholato]iron(II)–Chloroform(2/3)
Authors: Kurahashi Masayasu , Kawase Akira 
Published: July 2006

Abstract
The crystals of bis[1-(2-thiazolylazo)-2-naphtholato]iron(II)-chloroform (2/3) are triclinic, with unit-cell dimensions of: a=12.509(7), b=11.911(6), c=10.460(4) Å, α=86.97(3), β=97.24(4), and γ=103.48(7)°, Z=2 for [FeII(C13H8N3OS)2]·1.5CHCl3, space group P\bar1. The complex is diamagnetic, and the iron atom is surrounded octahedrally by two terdentate ligands in the mer configuration.
Aromatic Nucleophilic Substitution. VI. 1H Nuclear Magnetic Resonance Evidence for the Rearrangement of 1,3-to 1,1-Anionic σ Complex in the Reactions of 1-Dialkylamino-2,4-dinitronaphthalenes with Potassium Alkoxides
Authors: Sekiguchi Shizen , Fujisawa Shigeru , Ando Yumiko 
Published: July 2006

Abstract
By use of NMR spectroscopy the rearrangement of 1,3- to 1,1-anionic σ complex (Meisenheimer complex) in the reactions of 1-dialkylamino-2,4-dinitronaphthalenes (dimethylamino-, diethylamino-, and N-methyl-N-butylamino, piperidyl) with potassium alkoxides in DMSO has been studied. The alkoxides used are potassium methoxide, ethoxide, isopropoxide, and t-butoxide. In the reactions of 1-dialkylamino-2,4-dinitronaphthalenes with the alkoxides the rearrangement could be spectrometrically analyzed. However, in the reaction of 1-dimethylamino-2,4-dinitro naphthalene with potassium t-butoxide the rearrangement was too fast to be clearly analyzed.
A New Synthesis of the Pungent Principles of Ginger —Zingerone, Gingerol and Shogaol—
Authors: Banno Kazuo , Mukaiyama Teruaki 
Published: July 2006

Abstract
The pungent principles of ginger —zingerone, gingerol and shogaol— are synthesized starting with vanillin in good yields by utilizing the Lewis acid-promoted cross aldol reaction in each key step.
Thermal Decarbonylation of Tropone
Authors: Amano Akira , Mukai Toshio , Nakazawa Tomoo , Okayama Kiyoaki 
Published: July 2006

Abstract
Thermal reaction of tropone has been studied at temperatures ranging from 420 to 490 °C and at residence times ranging from 1.5 to 6.9 s using a conventional flow apparatus. Tropone undergoes first-order unimolecular decarbonylation. The value of kinetic parameters for this reaction are evaluated as being: A=1014.2s−1, Ea=54.1 kcal mol−1, ΔS\eweq=2.8 eu, ΔH\eweq=52.6 kcal mol−1, and ΔG\eweq=50.6 kcal mol−1. These values indicate that the decarbonylation takes place by one-step concerted mechanism via a norcaradienone-like transition complex. The latter complex is characterized by a partial transannular C2–C7 bond formation and concerted elongation of C1–C2 and C1–C7 bonds in tropone. The proposed transition complex is in conformity with reported thermal behavior of 1,3,5-cycloheptatriene as well as with molecular orbital symmetry theory.
Viscosity B Coefficients for Di- and Trialkylammonium Chlorides in Aqueous Solutions
Authors: Tamaki Kunio , Kushida Mitsuyoshi , Ohara Y\={o}ko 
Published: July 2006

Abstract
The viscosity B coefficients of the Jones-Dole equation for di-n-alkylammonium chlorides (methyl to butyl) and tri-n-alkylammonium chlorides (methyl to propyl) in water at 25 °C were determined, and the effect of structural changes in the solvent water induced by the alkyl-substituted ammonium ions is discussed.
The Cycloaddition of 1,2,4,5-Tetrazines with Indoles. The Formation of 5H-Pyridazino[4,5-b]indoles
Authors: Takahashi Masahiko , Ishida Hiroyuki , Kohmoto Masao 
Published: July 2006

Abstract
The cycloaddition of 3,6-disubstituted 1,2,4,5-tetrazines (1) with indoles (2) gave 1,4-disubstituted 5H-pyridazino[4,5-b]indoles (4).
Infrared Absorption Spectrum of Gaseous CF3CO Radical; Recording on a Rapid-Scan Infrared Spectrometer
Authors: Kozuka Muneteru , Isobe Taro 
Published: July 2006

Abstract
A rapid-scan infrared spectrometer capable of scanning the region from 5000 to 650 cm−1 in 200 μs was constructed and successfully applied to study CF3CO radical produced by flash photolysis. Four absorption bands of the radical were detected at 1574, 1338, 1115, and 1024 cm−1 for scanning started 25 μs after the firing of a Xe flash tube. They were tentatively assigned to the CO stretching, CF3 stretching (a species), CF3 stretching (e species), and CC stretching vibrations, respectively.
Finite Element Approach to the Vibrational Schrödinger Equation of Diatomic Species
Authors: Arai Hideyuki , Kanesaka Isao , Kagawa Yukio 
Published: July 2006

Abstract
The finite element approach was successfully applied to the vibrational Schrödinger equation of diatomic species. An O2 molecule with a harmonic potential and an Ar2 molecule with a Lennard-Jones potential were examined and their eigen values and the associated eigen function were obtained. The calculated eigen values of the O2 molecule agree with those expected. In the case of the Ar2 molecule the calculated eigen values agree with those experimentally obtained when Lennard-Jones parameters are ε=115.1 (cm−1) and σ=3.35 (Å). This verifies the validity of the present approach.
The Crystal Structure of the Intermolecular Complex between 9-Ethyladenine and Indole
Authors: Kaneda Tsuguhiro , Tanaka Jiro 
Published: July 2006

Abstract
The crystal structure of a 1: 1 complex of 9-ethyladenine and indole has been determined by the X-ray method. The crystal system is monoclinic with the space group of P21/c. The cell dimensions are a=15.712(2), b=8.098(1), c=11.838(1)Å, and β=103.90(1)°C. Adenines form walls made of double layer. An overlap of adenines is found between layers. The adenine molecule in the front layer is found to be joined by the hydrogen bond with the molecule in the back layer. An intermolecular hydrogen bond is found between adenine and indole rings. The significance of these observations in the interaction of adenine with tryptophan in biological systems is discussed.
Topological Index as Applied to π-Electronic Systems. IV. On the Topological Factors Causing Non-Uniform π-Electron Charge Distribution in Non-Alternant Hydrocarbons
Authors: Gutman Ivan , Yamaguchi Tamië , Hosoya Haruo 
Published: July 2006

Abstract
The topological factors which cause non-uniform π-electron charge distribution in non-alternant hydrocarbons (NAH′s) are discussed. For estimating and analyzing the net-charge density a novel topological index, topological charge density, QrT, is proposed. It is defined as QrT=Re(FG,r(1)), the real part of FG,r(y)=Δr,r(iy)⁄Δ(iy), where Δ(x) is the secular determinant of graph G and Δr,r(x) is its adjunct with row r and column r struck out. This quantity QrT, corresponding to the Coulson net charge density Qr=1−qr, is related with the topological indices \widetildeZG and \widetildeYG which are defined in terms of the coefficients of the characteristic polynomial of graph G. As all the newly proposed indices can be enumerated graphically, one can easily estimate the net-charge densities of NAH′s.
Preparative and Magnetic Studies of Several Binuclear Copper(II) Alkanoate Complexes with Salicylideneamines
Authors: Tokii Tadashi , Muto Yoneichiro 
Published: July 2006

Abstract
Compounds with the stoichiometry of Cu(5-R″-sal·N–R)R′COO (5-R″-sal·N–=·\overset2O·C6H3(\overset5R″)·\overset1CH=N–; R= methyl, phenyl, o-tolyl and p-tolyl; R′=ethyl, monochloromethyl and dichloromethyl; R″=H, CH3 and Cl) have been prepared, and their magnetic and spectral properties have been studied. The magnetic and IR spectral data of the compounds where R=methyl and o-tolyl, R′=dichloromethyl, and R″=H indicate that they have phenolic oxygen-bridged dimer units in their crystals. On the other hand, a carboxylate-bridged binuclear structure is postulated for the other complexes on the basis of magnetic and IR spectral data. It has been observed that, in the latter group of complexes, both the −2J(singlet-triplet separation) and νmax (ligand-field transition energy) values decrease in the order of Cu(Sal·N–R)C2H5COO&gt;Cu(Sal·N–R)ClCH2COO&gt;Cu(Sal·N–R)Cl2CHCOO, where Sal·N–=·\overset2O·C6H4·\overset1CH=N–. The preparation and characterization of the Cu(Sal·N–R)HCOO·DMF compounds (R=p-tolyl and p-chlorophenyl; DMF=N,N-dimethylformamide) are also reported.
Kinetic Study on Dimerization of Chlorotris(triphenylphosphine)rhodium(I) in Benzene
Authors: Ohtani Yoshimi , Fujimoto Masatoshi , Yamagishi Akihiko 
Published: July 2006

Abstract
The monomer-dimer equilibrium of RhCl(PPh3)3 in benzene has been studied with a stopped-flow apparatus under He gas pressure. The decomposition rate of a dimer, [RhCl(PPh3)2]2, obeys pseudo-first-order kinetics with respect to the concentration of PPh3, whereas the formation rate of a dimer obtained by diluting an equilibrium solution with benzene depends on the equilibrium concentration of a monomer, a dimer and PPh3 in a complexed manner. The kinetic results are consistent with the following mechanism; 2RhCl(PPh3)3\ightleftarrowsRhCl(PPh3)2+RhCl(PPh3)3+PPh3\ightleftarrows[RhCl(PPh3)2]2+2PPh3.