bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Formation of Substituted Quinazolines from Substituted Indoles by the Sensitized Photo-oxygenation in the Presence of Ammonium Acetate
Authors: Maeda Koko , Mishima Tamako , Hayashi Taro 
Published: July 2006

Abstract
2,4-Di- and 2,4,6-trisubstituted quinazolines (II) were prepared from 2,3-di- and 2,3,5-trisubstituted indoles (I) respectively by the sensitized photo-oxygenation in aqueous methanol in the presence of ammonium acetate or by fusion with ammonium acetate after the photo-oxygenation. Chemical evidences that II was produced via the hydroperoxide (III) of the indole and then the dicarbonyl compound (IV) were provided.
An ESR Study of Methylamino Radicals Photoproduced on the Porous Vycor Glass Surface
Authors: Hatano Keiichiro , Shimamoto Norio , Katsu Takashi , Fujita Yuzaburo 
Published: July 2006

Abstract
The photochemical decomposition of methylamines adsorbed on the surface of the porous Vycor glass was studied at 77 K by the ESR method, and the ESR spectra of the methylamino radicals, CH3NH, CH3ND, CD3NH, CD3ND, CH2DNH, and CH2DND, were observed as primary radicals from variously-deuterated methylamines upon irradiation with the light of a low-pressure mercury lamp. This result shows that the primary process is preferentially a rupture of the N–H or N–D bond of methylamine. These spectra were characterized by an apparent quenching of the N-hyperfine splitting resulting from large hyperfine anisotropy, and by nearly isotropic proton hyperfine splittings in both methyl and amino groups. The hyperfine splitting constants of the N, H, and D nuclei of each radical were determined, and consequently a D-substitution effect on the β-proton hf splitting in the methyl group was found. The characteristics of the ESR spectra were discussed in relation to the adsorbed state of the methylamino radical on the porous Vycor glass surface.
X-Ray Photoelectron Spectroscopy of EDTA
Authors: Yoshida Tooru , sawada Shigemasa 
Published: July 2006

Abstract
The binding energies of N(1s) in ethylenediaminetetraacetic acid (EDTA) and its related compounds were measured by means of a photoelectron spectrometer, and the molecular structures of EDTA were discussed. Two kinds of peaks were observed in the N(1s) spectra of EDTA and its related compounds, with binding energies of about 401 and 399 eV. In EDTA-4H, the heights of the two peaks were almost equal, while in its sodium salts the peak height with the higher binding energy decreased as the number of carboxylate groups in the molecule increased. In EDTA-4Na, only a single peak with a low binding energy was observed. In EDTP-4H and GEDTA-4H, the spectra showed two peaks with different heights. The binding energy values of the main peaks of simple amino acids, such as glycine and alanine, were about 401 eV. From the above results, it can be deduced that there are two kinds of N atoms, =N+H– and =N– types, in an EDTA molecule.
ESR of Copper(II) Complexes in Magnetically Non-dilute Crystals. II. Polycrystals of Various Bis(amino acidato) copper(II) Complexes
Authors: Yokoi Hiroshi 
Published: July 2006

Abstract
The molecular g values of several bis(amino acidato) copper(II) complexes in crystals, whose crystal structures with two molecules per unit cell are known, have been estimated from the crystal g values by considering the effect of the spin-exchange interaction between the dissimilar copper(II) ions. All the crystal g values have been determined here from the powder K-band ESR spectra. Many other complexes with unknown crystal structures have also been dealt with in a similar way. The results have indicated that most of the complexes probably have a tetragonal or nearly tetragonal copper (II) ion environment in crystals, and a tendency for the estimated g⁄⁄ value to decrease with an increase in the energy of the visible absorption peak in crystals have been noted. A discussion about the correlation between an axial molecular g tensor and the two copper-ligand bond lengths of Cu–O and Cu–N has been given.
Vibrational Spectrum of Trisdimethylaminocyclopropenium Perchlorate
Authors: Yoshida Zen-ichi , Tawara Yoshiyuki , Hirota Shizue , Ogoshi Hisanobu 
Published: July 2006

Abstract
Infrared spectrum in the region 4000–100 cm−1 and Raman spectrum of trisdimethylaminocyclopropenium perchlorate (1) have been measured. Band assignments have been made on the basis of normal coordinate analysis and deuteration of the methyl groups. Remarkable stabilization of cyclopropenium ion due to the peripheral amino groups is attributed to a marked delocalization of the positive charge of the ring on the amino groups through conjugation. Peculiar electronic structure of trisaminocyclopropenium ion is explained in terms of its vibrational spectrum.
Standard Potentials of Alkali Metals, Silver, and Thallium Metal/Ion Couples in N,N′-Dimethylformamide, Dimethyl Sulfoxide, and Propylene Carbonate
Authors: Matsuura Niro , Umemoto Kisaburo , Takeuchi Zen’ichi 
Published: July 2006

Abstract
The relative standard potentials of alkali metals, silver, and thallium metal/ion couples in N,N′-dimethylforrnamide(DMF), dimethyl sulfoxide(DMSO), and propylene carbonate (PC) were measured against an aqueous saturated calomel electrode(SGE). These standard potentials of lithium, sodium, potassium, rubidium, caesium, thallium, and silver are −3.237, −2.898, −3.116, −3.079, −3.079, −0.643, and +0.372 V vs. SGE respectively in DMSO, and −3.163, −2.830, −3.067, −3.040, −3.048, −0.559, and +0.538 V vs. SGE respectively in DMF, and −2.9064, −2.691, −3.002, −2.980, −2.986, −0.402, and +0.813 V vs. SGE respectively in PC. The thallium electrode was found to be stable enough to be used as a reference electrode in these solvents. For the purpose of examining the Debye-Hückel equation for estimating the activity coefficient, the formal potentials of the thallium electrode were measured at various ionic strengths. The Debye-Hückel equation was confirmed to be applicable in these solvents, provided a proper value was chosen for the ionic radius parameter, a, for each solvent–3.6 for DMSO, 5.0 for DMF and 0.0 for PC.
The Photochemistry of 2-Quinolinecarbonitriles. II. A Mechanism of the Photoinduced Substitution Reaction
Authors: Hata Norisuke , Saito Tsugio 
Published: July 2006

Abstract
In order to elucidate the mechanism of the photoinduced substitution reaction of 2-quinolinecarbonitrile in alcohols or ethers, measurements of the absorption and fluorescence spectra and the photochemical reactions were carried out in ethanol, t-butyl alcohol, or diethyl ether; consequently, an interesting relationship has been found to exist between the fluorescence intensity and the photoreactivity. The photosubstitution reaction can reasonably be assumed to be initiated by a hydrogen-atom abstraction from an alcohol or ether by the nitrogen atom of the quinoline nucleus. The experimental results indicated that such a hydrogen-atom abstraction was markedly facilitated by a hydrogen-bond formation of the nitrogen lone pair of the quinoline nucleus with ethanol or water: further, the reactive excited singlet state (S1) was presumed to be of a π,π* nature.
Vacuum Ultraviolet Absorption and Photoelectron Spectra of Aliphatic Ketones
Authors: Ogata Hitoshi , Kitayama Jun , Koto Masanori , Kojima Shinji , Nihei Yoshimasa , Kamada Hitoshi 
Published: July 2006

Abstract
The vacuum ultraviolet absorption spectra down to 65000 cm−1 and Hel photoelectron spectra were measured for CH3CHO and RCOCH3 (R=CH3 to t-C4H9). Assignments of the absorption bands are proposed with the aid of photoelectron spectra and CNDO/2 type molecular orbital calculations. Special notice has been paid to the similarity of the vibrational structure between the lowest ionization potential bands of photoelectron spectra and the second bands of vacuum ultraviolet absorption spectra.
Molecular Vibrations and Force Fields of Alkyl Sulfides. VII. Polythiomethylene (PTM) and Polythiomethylene-d2 (PTM-D2), and Their Model Compounds: CH3S(CH2S)nCH3 (n=1–3)
Authors: Ohsaku Masaru 
Published: July 2006

Abstract
Infrared spectra of polythiomethylene (PTM) and polythiomethylene-d2 (PTM-D2) observed by a Nujol mull method are reported, and their spectra are assigned. Normal coordinates of bis (methylthio)methane, CH3SCH2SCH3, bis(methylthiomethyl) sulfide, CH3SCH2SCH2SCH3, bis[methylthio(methylthio)]methane, CH3SCH2SCH2SCH2SCH3, PTM, and PTM-D2 have been treated. The force field used in the computation is a modified Urey-Bradley type. The skeletal conformation of these model compounds in the solid state is confirmed to be the [G] form. The relations between the degree of n and their CH2 deformation fundamentals are explained by the concept of the frequency-phase difference. The calculated frequencies are compared with those of experiment. A comparison of the force fields of PTM and polyoxyme hylene (POM) is also briefly made.
Polymerizationn of Vinyl Compounds by Dihydridotetrakis-(triphenylphosphine)ruthenium(II)
Authors: Komiya Sanshiro , Yamamoto Akio , Ikeda Sakuji 
Published: July 2006

Abstract
Dihydridotetrakis(triphenyIphosphine)ruthenium(II) 1 initiates the polymerization of α-substituted olefins of high e-values such as acrylonitrile and forms unstable complexes with olefins of low e-values. Molecular weight of the polymer obtained by the polymerization of acrylonitrile with 1 was independent of polymerization time and increased linearly with the monomer concentration. The rate of polymerization was measured by a dilatometry and compared with the rate of decomposition of 1 in the presence of acrylonitrile followed by a spectroscopic method. The rate of decomposition of 1 was found to be equivalent to the rate of initiation of polymerization and can be expressed by the following equations:
-\fracddt[Ru]=k[Ru], \frac1k=A+{B+C[PPh_3]}/[monomer]
On the basis of the kinetic results and the independence of molecular weight of the polymer on time, a mechanism involving a slow initiation step followed by rapid propagation and termination steps is proposed.
ESR Study of MoO3 Obtained from Thermal Decomposition of Ammonium Molybdate
Authors: Mann R S , Khulbe K C 
Published: July 2006

Abstract
The thermal decomposition of ammonium molybdate, between 100–600°C was studied by ESR technique. At 250 °C all ammonium molybdate was decomposed into molybdenum trioxide. Samples taken at 250, 300, 350, 400 and 450 °C all gave ESR signals. Samples at other temperatures (higher and below of this temperature range) did not give any ESR signal. The ESR signals were due to the formation of Mo5+ and Mo3+ ions. The maximum ESR intensity was observed for the sample (MoO3) at 300 °C. The different colouration of molybdenum trioxide formed at different temperature, was due to Mo5+ and Mo3+ ions.
Complexing Behaviour of 5-Amino-1,3,4-Thiazole-2-thiol. II. Complexes of Ni(II), Rh(I), Pd(II), Pt(II), Au(III) and Cu(II)
Authors: Gajendragad M R , Agarwala U 
Published: July 2006

Abstract
Complexes of Ni(II), Rh(I) Pd(II), Pt(II), Au(III) and Cu(II) with 5-Amino-1,3,4-thiadiazole-2-thiol have been prepared. Probable structures have been proposed for the complexes on the basis of visible and infrared spectral and magnetic susceptibility data and results of chemical analysis. Crystal field parameters have been calculated wherever possible.
Eetyl Radical Formed in the Grignard Reaction of 2-Methylbenzophenone
Authors: Okubo Masao 
Published: July 2006

Abstract
The radical in the title reaction gave an ESR spectrum different from that of potassium-ketyl. From studies using the deuterium label technique, the reason for this difference was ascribed to the suppression of the twisting vibration caused by aggregate-formation.
Reaction of Benzyne with N-Benzylideneaniline
Authors: Nakayama Jyuzo , Midorikawa Hiroshi , Yoshida Masayuki 
Published: July 2006

Abstract
Benzyne, generated from benzenediazonium-2-carboxylate and 2-carboxybenzenediazonium chloride, reacted with N-benzylideneaniline to give N-(o-anilinobenzhydryl)aniline (I) and 5,6-dihydro-5,6-diphenylphenanthridine (II) as final products.
New Furanosesquiterpenes from Ligularia Fischeri Turcz. 1β, 10β- Epoxyfuranoeremophilan-6β-ol and Its Derivative
Authors: Sato Toshichika , Moriyama Yoshihiko , Nagano Hajime , Tanahashi Yoshiaki , Takahashi Takeyoshi 
Published: July 2006

Abstract
Two new furanosesquiterpenes, isolated from Ligularia Fischeri Turcz. (collected at Shiramine), were shown to be 1β,10β-epoxyfuranoeremophilan-6β-ol (1) and 1β,10β-epoxyfuranoeremophilan-6β-yl 2-hydroxymethylprop 2-enoate (2).
Molecular Complexes of Arenetricarbonylchromium, -molybdenum and -wolfram
Authors: Kobayashi Hiroshi , Kobayashi Mitaka , Kaizu Youkoh 
Published: July 2006

Abstract
Arenetricarbonylchromium forms a charge-transfer complex with 1,3,5-trinitrobenzene (1,3,5-TNB), while arenetricarbonylmolybdenum and -wolfram do not form a charge-transfer complex with 1,3,5-TNB. On the other hand, arenetricarbonylchromium, -molybdenum and -wolfram form a charge-transfer complex with tetracyanoethylene (TCNE). Since the intramolecular charge transfer from coordinated arene to carbonyls increases in the molybdenum and wolfram derivatives, 1,3,5-trinitrobenzene cannot form a molecular complex accepting an electronic charge of the coordinated arene. In the case of TCNE, however, a molecular complex is formed by an inner-sphere charge-transfer interaction between the acceptor and the central metal atom. Thus the stability of the TCNE molecular complexes is dependent upon the charge density of the central metal atom and also the steric effects due to the functional groups in coordinated arenes. The ionization potentials of the molybdenum and wolfram derivatives observed for their TCNE molecular complexes are almost equal but higher than those of the corresponding chromium derivatives, whereas the highest stability is obtained for the molybdenum derivatives.
The Cd 5 3P0 State in the Cadmium-photosensitized Reaction and the Quenching of the Resonance Radiation at 326.1 nm by Nitrogen, Carbon Monoxide, and Carbon Dioxide
Authors: Yamamoto Shunzo , Takaoka Motoaki , Tsunashima Shigeru , Sato Shin 
Published: July 2006

Abstract
The emission of the resonance line at 326.1 nm (5 3P1→5 1S0) and the absorptions of Cd(3P0) at 340.4 nm (5 3D1←5 3P0) and of Cd(3P1) at 346.6 nm (5 3D2←5 3P1) have been measured as functions of the pressure of foreign gases at 250°C. At the pressures higher than 1 Torr of any rare gas, an equilibrium was established between 5 3P1 and 5 3P0 states. The efficiency of nitrogen in producing the 5 3P0 state from the 5 3P1 state was found to be more than 103 times those of rare gases. The quenching efficiencies of nitrogen, carbon monoxide, and carbon dioxide for the resonance radiation at 326.1 nm were also measured by using argon as the diluent gas. The halfquenching pressures obtained were 73±3, 0.47±0.01, and 0.096±0.003 Torr for nitrogen, carbon monoxide, and carbon dioxide respectively.
Deoxygenation of Sulfoxides to Sulfides in an Iodine–Pyridine–Sulfur Dioxide System
Authors: Nojima Masatomo , Nagata Tsuyoshi , Tokura Niichiro 
Published: July 2006

Abstract
Sulfoxides were deoxygenated quantitatively in an iodine-pyridine-sulfur dioxide system under mild reaction conditions. The same reaction also occurred with bromine.
The Contribution of the Double Collision Occurring in an Atom to the Yield of the Ionization and Excitations of Noble Gases Irradiated by 100 keV Electrons
Authors: Okazaki Kiyoshi , Sato Shin , Ohno Shin-ichi 
Published: July 2006

Abstract
Gryzinski’s classical treatment of the double ionization has been used to estimate the contribution of the double-collision process to the G-values of the ionizations and excitations of noble gases irradiated by 100 keV electrons. Except for helium, the double collision accounted for 5–15% of the yield of electrons. The total G-values calculated are ultimately as follows (in the order of He, Ne, Ar, Kr, and Xe): 2.28, 2.53, 3.09, 3.41, 3.67 for G(electrons); 0.84, 1.37, 1.78, 1.54, 1.41 for G(excited singlet states); 0.17, 0.07, 0.13, 0.23, 0.39 for G(triplet states).
Ruthenium Complexes with Coordinated Hydroxyiminoacetylacetonato or Bridging Nitrosyl Groups Formed by the Reactions of Nitrosylruthenium(III) with Acetylacetone
Authors: Mukaida Masao , Nomura Terunosuke , Ishimori Tatsujiro 
Published: July 2006

Abstract
Complexes formed by the reactions of nitrosylruthenium(III) with acetylacetone were investigated. The following products: [Ru(acac)2(hia)], 1; cis-[RuCl(NO)(acac)2], 2; and [Ru(NO)(acac)24], 3; (acac=C5H7O2− and hia=C5H6NO3−), were isolated as crystals and were characterized. On the basis of chemical and thermal analyses, and on the basis of observations of the magnetic properties, the conductivities, the molecular weights, the infrared spectra, and the NMR spectra, it was concluded that 1 contains the hydroxyiminoacetyl acetonato ligand, which is formed by the reaction of the coordinated nitrosyl group with acetylacetone, and that 2 contains a terminal nitrosyl group, and 3, bridging nitrosyl groups.
Intramolecular Oxypalladation. Cyclization Reaction of 2-Allylphenols with Palladium Salts
Authors: Hosokawa Takahiro , Ohkata Hisao , Moritani Ichiro 
Published: July 2006

Abstract
The stoichiometric reaction of sodium salts of 2-allylphenols 1 with dichlorobis(benzonitrile)palladium(II) gives generally 2-substituted benzofurans 2 in moderate yields. The formation of cyclized products is explained by intramolecular oxypalladation followed by elimination of a palladium hydride species. The cyclization can be made catalytic by using palladium(II) acetate, cupric acetate, and oxygen.
The Crystal and Molecular Structure of Sterigmatin, A Metabolite of Aspergillus versicolor
Authors: Fukuyama Keiichi , Tsukihara Tomitake , Katsube Yukiteru , Hamasaki Takashi , Hatsuda Yuichi , Tanaka Nobuo , Ashida Tamaichi , Kakudo Masao 
Published: July 2006

Abstract
The crystal structure of sterigmatin has been determined by single-crystal X-ray analysis. The crystals are triclinic; space group P1, Z=2, with a=14.392(4), b=14.120(4), c=4.256(2) Å, α=78.22(3), β=100.42(3), γ=56.90(3)°. The structure was refined to an R value of 0.039 for 1961 reflections. There are two intramolecular hydrogen bonds in each of the crystallographically independent molecules.
The Solubility of Elemental Mercury Vapor in Water
Authors: Sanemasa Isao 
Published: July 2006

Abstract
The solubility of mercury vapor in water has been measured by means of atomic absorption spectrophotometry over the temperature range of 5–60°C under atmospheric pressure. The aqueous solubility obeys Henry’s law at each temperature. The solubilities and the Henry coefficients are reported. From the solubility data, the heat of the solution of mercury vapor in water is found to be −5.3 kcal/mol. The relationship between the Henry coefficient, k, and the solution temperature, T, is expressed by logk=−1078×1⁄T+6.250. From this equation, the solubilities at 70–100°C are estimated. The solubility of the mercury vapor in sea water has also been measured over the temperature range of 5–30°C. A salting-out effect on the solubility is observed. The practical application of the aqueous solubility of the mercury vapor is discussed from the analytical point of view.
The Chemical Behavior of Low Valence Sulfur Compounds. IX. Photometric Determination of Thiosulfate, Trithionate and Tetrathionate in Mixture
Authors: Mizoguchi Tadaaki , Okabe Taijiro 
Published: July 2006

Abstract
The cyanolysis and photometric determination of thiosulfate, trithionate and tetrathionate have been investigated under the various conditions. The cyanolysis of thiosulfate catalyzed by cupric ions proceeded quantitatively in the presence of acetate buffer solution of pH 4.5, while the degree of cyanolysis of trithionate and that of tetrathionate were 0.3 and 0.6%, respectively. The degree of cyanolysis of trithionate was not so depressed as to a negligible extent by the methods previously proposed, but was depressed to 0.7% or less by the addition of such organic solvents as acetone, methanol, etc. The determination of thiosulfate, trithionate and tetrathionate in the concomitant presence of them could be made with a high accuracy.
NH2 Radicals Trapped on the Surface of Porous Vycor Glass at 77 K
Authors: Shimamoto Norio , Hatano Keiichiro , Katsu Takashi , Fujita Yuzaburo 
Published: July 2006

Abstract
The results of ESR studies of the amino radicals produced by the photolysis of ammonia adsorbed on the surface of porous Vycor glass at 77 K are described. The observed ESR signal patterns of the amino radicals were remarkably affected by the amount of ammonia on the surface. The isotropic and anisotropic spectra were analyzed by the use of isotopically-substituted amino radicals.
Studies of Polyphenyls and Polyphenylenes. I. The Syntheses and Infrared and Electronic Spectra of Several Sexiphenyls
Authors: Ibuki Eiichi , Ozasa Shigeru , Murai Kazue 
Published: July 2006

Abstract
Seven linear sexiphenyls were synthesized by the Ullmann reaction of iodobiphenyl and diiodobiphenyl. Infrared studies indicated that the fine structure in the 780–810 cm−1 region suggests the presence of consecutive m-phenylene units, and that the positions of the strong or medium bands in the 820–840 cm−1 region indicate approximately the number of continuous p-phenylene units. The electronic spectra commonly displayed a prominent E-band in the narrow region of 192–207 nm. The intense K-band above 260 nm was considered to be an indication of the presence of one or more p-phenylene units.
The High Resolution Mass Spectra of Shionane and Friedelane Derivatives
Authors: Hirota Hiroshi , Moriyama Yoshihiko , Tsuyuki Takahiko , Tanahashi Yoshiaki , Takahashi Takeyoshi , Katoh Yoshiaki , Satoh Hiroshi 
Published: July 2006

Abstract
High resolution mass spectra of shionane and friedelane derivatives were measured and characteristic fragmentation patterns were described.
Electric Properties of 1-Tetradecanol-Tetradecanoic Acid (Myristyl Alcohol-Myristic Acid) Mixed Bimolecular Films
Authors: Okuyama Masataka , Yoshida Tadayoshi , Tanii Tadaaki , Kunugi Masahito , Ishizaki Isao 
Published: July 2006

Abstract
Stable bimolecular films (bilayers) were found to be formed in aqueous solutions from myristyl alcohol or from mixtures of myristyl alcohol and myristic acid. The electric capacitance and resistance of these bilayers were measured in solutions of pH 3–8. The capacitance of mixed bilayers was larger than that of myristyl alcohol bilayers (0.58 μF/cm2). When the bilayers were formed from sample solutions having mole ratios 1/1 and 2.3/1 (myristic acid to myristyl alcohol), the capacitance had minima at ca. pH 7. The resistance of mixed bilayers at ca. pH 5 was smaller than one tenth of that of the myristyl alcohol bilayer (ca. 7×108 Ω·cm2). The results are explained in terms of (i) van der Waals attraction between hydrocarbon chains, (ii) the tendency for myristic acid to form expanded layers, (iii) the head group attraction between the myristic acid ion and myristyl alcohol, and (iv) the tendency for myristic acid ions to dissolve in the aqueous phase.
Molecular Structure of 2-Fluoropropane as Determined By Gas Electron Diffraction
Authors: Kakubari Hironobu , Iijima Takao , Kimura Masao 
Published: July 2006

Abstract
The skeletal parameters, C–C, C–F, and C···F distances, of 2-fluoropropane have been determined by means of gas electron diffraction. The rg-values obtained are: C–C 1.514±0.004 Å, C–F 1.405±0.005 Å and C···F 2.366±0.006 Å. By a joint analysis of the diffraction data and the spectroscopic moments of inertia, determination of the remaining structural parameters has also been attempted, and the φz value of the CCC angle being found to be 114.6±1.5°.