bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Fluorometric Determination of Zinc in Portland Cement with 8-Quinolinethiol
Authors: Watanabe Kunihiro , Kawagaki Ky\={o}z\={o} 
Published: July 2006

Abstract
A method for the fluorometric determination of zinc in cement with 8-quinolinethiol is presented. o-Phenanthroline and sodium thiosulfate have been found to be useful as masking reagents of interfering ions.
Synthesis of trans-Dibromo-bis{(2-pyridyl)methylamine} and -bis {S-1-(2-pyridyl)ethylamine} cobalt(III) Complexes
Authors: Suzuki Toshishige M , Watanabe Yoshiko , Fujita Junnosuke , Saito Kazuo 
Published: July 2006

Abstract
Light green crystals of trans-dibromo-bis{(2-pyridyl)-methylamine} and -bis{S-1-(2-pyridyl) -ethylamine}cobalt(III) bromide have been prepared. The latter complex shows a circular dichroism (CD) spectrum enantiomeric with that of the corresponding S-propylenediamine complex in the first absorption band region.
The Photolysis of Dimethyl Diazomalonate in Alcohols. The Detection of Triplet Carbene
Authors: Ando Wataru , Hagiwara Tsuneo , Migita Toshihiko 
Published: July 2006

Abstract
The photolysis of dimethyl diazomalonate n alcohols gave the O–H insertion product of biscarbomethoxycarbene and dimethyl malonate as the major products. The dimethyl malonate might be formed by the hydrogen abstraction of a triplet carbene.
The Optical Rotatory Dispersion and Circular Dichroism of Levoglucosenone
Authors: Ohnishi Akio , Takagi Eriko , Kat\={o} Kunio 
Published: July 2006

Abstract
The ORD and CD of levoglucosenone were measured in order to elucidate its abnormally large [α]dvalue of −524°. The complicated pattern observed was considered to contain three Cotton effects—at 357, 231 and 207 nm; the first one at 357 nm seems to be responsible for the large [α]d value.
Temperature-Dependent Infrared Study on l- and Dl-α-Alanine
Authors: Kaneko Norio , Takahashi Hiroaki , Higasi Keniti 
Published: July 2006

Abstract
Infrared spectra from 4000 to 30 cm−1 of l- and Dl-α-alanine and their N-deuterated analogues were measured at temperatures ranging from 295 to 100 K. Highly temperature-dependent bands were observed at 972 cm−1 (at 100 K) for l-α-alanine and 975 cm−1 for Dl-α-alanine. The temperature dependence of the half-widths of these bands indicates that above 200 K the vibrational modes are considerably modulated by some motions, possibly arising from breaking of hydrogen bonds. These bands are thus assigned to the first overtone of the NH3+ torsional mode.
Studies on Bond Character in Phosphorus Ylides by Combustion Heat and X-Ray Photoelectron Spectroscopy
Authors: Sen\={o} Manabu , Tsuchiya Shinji , Kise Hideo , Asahara Teruzo 
Published: July 2006

Abstract
In order to clarify the electron structure of carbonyl-stabilized phosphorus ylides, measurements of X-ray photoelectron spectroscopy (XPS) and combustion heat were performed. NMR and IR spectra were also measured as complementary methods. The results suggest that carbomethoxymethylenetriphenylphosphorane has a major contribution of polar bond (\overset+P—\overset−C) structure, whereas benzoylmethylenetriphenylphosphoranes have a larger contribution of covalent bond (P=C). A dπ–pπ interaction in the P–C bond was interpreted for XPS and NMR. The data for heat of combustion suggest that a large contribution of the polar bond structure brings about stabilization of the ylide molecule. These results show that XPS and combustion heat measurements are useful means for the analysis of ylide bonding.
Stereoisomers of the Bis(l-hydrogenaspartato)trimethylenediaminecobalt(III) Complex
Authors: Kojima Yoshihiro 
Published: July 2006

Abstract
The bis(l-hydrogenaspartato)trimethylenediaminecobalt(III) complex has been prepared by the reaction of the trans-[CoCl2(tn)2]+ complex with l-aspartic acid, and its eight stereoisomers have been separated by an ion-exchange chromatographic method. The six isomers are trans(O)-Λ and -Δ, cis(O)cis(N)-Λ and -Δ and trans(N)-Λ and -Δ isomers, in which either aspartate ion forms the five-membered chelate ring through an N atom of the amino group and an O atom of the α-carboxylate group. The remaining isomers are Λ- and Δ-trans(O) ones containing a five-membered chelate ring and a six-membered ring of l-aspartate ions. On the other hand, stereoselective formations have been found in the Λ,Δ, and Λ isomers for the trans(O), cis(O)cis(N), and trans(N) isomers respectively. It has become apparent that these stereoselectivities agree with those found for the corresponding l-pn and en complexes, while the orders of the formation amounts for the three geometrical isomers disagree.
Effect of Various Additives on Color Center Formation and Brightness Depreciation of Calcium Halophosphate Phosphors
Authors: Narita Kazuo , Tsuda Nobuyuki 
Published: July 2006

Abstract
Color center formation and brightness depreciation by 185 nm radiation were studied in calcium halophosphates containing various additives. Partial bleaching experiments show that the depreciation of plaque brightness is due to the absorption of 254 nm radiation by color centers, the reabsorption of luminescence by color centers being unimportant. In unactivated Ca halophosphates, the stronger the 185 nm absorption of additives, the weaker the color center formation. In Sb- and Mn-activated Ca halophosphates, however, no clear relation is found between the 185 nm absorption of additives and the brightness depreciation. The effect of cesium on improving lamp performance is described.
Ketyl Radicals Formed in Grignard Reaction. III. Steric Effects on the Formation of Radicals
Authors: Okubo Masao 
Published: July 2006

Abstract
In the reaction of benzophenone with phenylmagnesium bromide, the concentration and life-time of the ketyl radical were influenced greatly by the substitution of ortho-hydrogen atoms of both the two reactants by methyl group. From the results of visible absorption and ESR measurements and also of product-analysis, the ketyl radical was considered to be a common intermediate towards normal and abnormal reaction products. The existence of an equilibrium between monomeric and dimeric states of the ketyl radical was also proposed.
Photoreduction and Photoaddition of N-Acetyldiphenylmethyleneamine in Alkylbenzenes
Authors: Asao Shuichiro , Toshima Naoki , Hirai Hidefumi 
Published: July 2006

Abstract
Irradiation of N-acetyldiphenylmethyleneamine (II) in toluene solution gave N-(1,1,2-triphenylethyl)acetamide and N-(1,1-diphenylmethyl)acetamide in 11% and 4.4% yields, respectively. The former is an addition product of toluene to the C=N bond of imine II, and the latter a hydrogenation product of II. The same kind of addition and hydrogenation products as those in toluene were obtained on irradiation of imine II in ethylbenzene, cumene, o-, m-, and p-xylene, mesitylene, p-methoxytoluene, and p-cyanotoluene, respectively. Two kinds of competitive reaction processes are proposed from the results of the substituent effects for the phenyl ring of toluene, the effect of the additives such as sensitizers and quenchers, and the dependence of the photoreaction yields on the concentration of the additive. The photoreaction proceeds not only by the “chemical sensitization” mechanism derived from the ketyl radical of benzophenone, a hydrolyzed product of II, but also by the mechanism through the excited state of II itself.
The Sesquiterpenes of Ginseng
Authors: Yoshihara Kazuo , Hirose Yoshio 
Published: July 2006

Abstract
The sesquiterpenes of ginseng have been studied. From the volatile oil, fifteen compounds were characterized. Three of those compounds, α-panasinsene,β-panasinsene and β-neoclovene, were new compounds and were characterized in this paper. Panasinsenes are considered as intermedial compounds in isomerization of caryophyllene to neoclovene.
Proton Magnetic Resonance of Metal Ammine Complexes. IV. Paramagnetic Anisotropy of Cobalt(III) Ions as Exemplified in Proton Chemical Shifts
Authors: Yoneda Hayami , Sakaguchi Ushio , Nakashima Yoshiaki 
Published: July 2006

Abstract
A theory is presented which couples the proton chemical shift induced by the paramagnetic anisotropy with the chemical shift of the central cobalt-59 nucleus. The theory has been successfully applied to twenty cobalt-(III) α-aminocarboxylate complexes. It is shown that it can be used not only to assign proton NMR signals but also to determine the structure of the complex and, in certain cases, the conformation of ligand molecules.
A Novel Preparation of Enamine Phosphonates from Ketene O,N-, S,N- and N,N-Acetals with Diethyl Phosphite
Authors: Fukuda Masahiro , Kan Kazuhito , Okamoto Yoshiki , Sakurai Hiroshi 
Published: July 2006

Abstract
1-Dimethylamino-1-methoxy-1-alkenes (ketene O,N-acetals), 1-dimethylamino-1-ethylthio-1-alkenes (ketene S,N-acetals) and 1,1-bis(dimethylamino)ethylene (ketene N,N-acetal) reacted with diethyl phosphite to give the corresponding (E)-diethyl 1-dimethylamino-1-alkenylphosphonates. Although ketene diethylacetal (ketene O,O-acetal) reacted with diethyl phosphite to give diethyl 1,1-diethoxy-1-ethylphosphonate, 1,1-bis(ethylthio)-1-alkenes (ketene S,S-acetals) did not react with diethyl phosphite.
The Structure of Yuzurimine-C
Authors: Yamamura Shosuke , Irikawa Hajime , Okumura Yasuaki , Hirata Yoshimasa 
Published: July 2006

Abstract
The structure of yuzurimine-C, one of the yuzurimine-type alkaloids, was unambiguously determined on the basis of chemical evidences coupled with its spectral data. Particularly, application of the 13C NMR spectra plays an important role in the structural elucidation.
Synthesis of 1-N-[(S)-4-Amino-2-hydroxybutyryl]lividomycin A
Authors: Watanabe Isamu , Tsuchiya Tsutomu , Umezawa Sumio , Umezawa Hamao 
Published: July 2006

Abstract
The title compound (7), which is active against resistant bacteria producing phosphotransferase I, was synthesized from lividomycin A through a cyclic carbamate derivative (3). Selective hydrolysis of the carbamate ring followed by acylation of the free C-1-amino group with (S)-2-hydroxy-4-aminobutyric acid by the active ester method led to 7.
Studies of the Fragment-ion Distribution and Reaction with a Charge Spectrometer. VI. A New Interpretation of the Fragmentation Mechanism in CH3X Based on the Molecular Orbital Method. (2)
Authors: Ikuta Shigeru , Yoshihara Kenji , Shiokawa Takanobu 
Published: July 2006

Abstract
We have proposed a new fragmentation mechanism and successfully applied it to various monosubstituted alkanes RX. The fragmentation mechanism can be described as follows: (1) The bond scission first occurs where the electrons exist densely in the particular occupied molecular orbital correlated to the particular ionization. (2) Process (1) competes with the electron redistribution. (3) In the higher-energy region, secondary scission also occurs. The breakdown curves of the CH3NH2+, CH3SH+, and CH3Br+ produced by charge-exchange reactions have been obtained by the use of a perpendicular double-mass spectrometer. The experimental results can be satisfactorily explained by the proposed mechanism on the basis of the calculated eigenvectors of the various molecular orbitals.
The Computation of the Thermodynamic Properties of Aqueous Electrolyte Solutions by Means of the Perturbation Theory of Fluids
Authors: Hirata Fumio , Arakawa Kiyoshi 
Published: July 2006

Abstract
A useful method to investigate the thermodynamic properties of aqueous electrolyte solutions was presented on the basis of the perturbation theory of fluids, where a primitive model was used as a reference system. A perturbation potential of a square type was applied. An analytical solution of the mean spherical model (MSM) equation obtained by Waisman and Lebowitz was used as the thermodynamic functions of the reference system, and an ionic distribution function in electrolyte solutions was derived. The values of the energy parameters which represent the depth of the well were determined by a comparison of the observed values of the thermodynamic quantities with the calculated ones.
Some Properties of the Salt between Inosine and l-Lysine
Authors: Suzuki Yoshihisa , Hara Kentaro , Hirahara Tsuneo 
Published: July 2006

Abstract
Among several basic amino acids, only the l-lysine free base was found to form a crystalline salt with inosine. A specific stereochemical arrangement of these two molecules, inosine and l-lysine, is considered to be involved in such a crystalline salt-formation on the basis of the fact that d-lysine did not form a crystalline salt with inosine. Part of the equilibria were determined at 10 °C for the inosine–l-lysine–water and inosine–l-lysine-60 w/w % aqueous ethanol systems. The salt was unstable against water, while it was stable against aqueous ethanol (containing more than about 40% ethanol). The solubility of the salt in water was summarized as follows: logS (w/w %) =0.0219t+0.624. The X-ray powder diffraction data of the salt are given.
A Polarographic Cell for the Continuous Monitoring of Column Effluents and Its Application to the Determination of Nitropyridine Derivatives
Authors: Wasa Tamotsu , Musha Soichiro 
Published: July 2006

Abstract
The construction of a microdetector, based on the principle of polarography, for liquid chromatography and its application are described. The characteristics of the flow cells with a horizontal dropping mercury electrode (HDME), a vertical dropping mercury electrode (DME), and a mercury plated platinum electrode (Hg–Pt) are compared with each other. The flow cell has been applied to the analysis of a mixture of nitropyridine derivatives, such as 2-amino-3-nitropyridine (A3N), 2-amino-5-nitropyridine (A5N), 2-hydroxy-3-nitropyridine (O3N), 2-hydroxy-5-nitropyridine (O5N), and 2-nitroaminopyridine (NA), by means of a reversed-phase partition column or an ion-exchange column. In quantitative analysis, a standard deviation of better than 3% can be obtained.
The Reactions of Recoil Tritium Atoms with Water. II. Reactivity Integral- and Moderator-Isotope Effects in H2O–D2O Binary Mixtures
Authors: Tachikawa Enzo , Aratono Yasuyuki 
Published: July 2006

Abstract
The HT and DT yields from the nuclear transformation of 6Li(n,α)T in H2O–D2O binary mixtures were studied in the liquid phase. The (HT/H2O)/(DT/D2O) ratio was nearly constant at 1.60±0.08 over the whole range of mol fractions of D2O in the presence of I2 as a scavenger. Using the kinetic model with reasonable assumptions, the relative efficiencies for the kinetic moderation of H2O, HDO, and D2O were determined. The results indicate that the collision of recoil T atoms with HDO, with a large fractional energy loss, must occur as frequently as with H2O.
An Analysis of the Surface Composition of Passive Film on Cu–Ni Alloys by means of Auger Electron Spectroscopy and X-Ray Photoelectron Specroscopy
Authors: Takasu Yoshio , Maru Shun-ichi , Matsuda Yoshiharu , Shimizu Hazime 
Published: July 2006

Abstract
A potentiostatic polarization method, Auger electron spectroscopy (AES), and photoelectron spectroscopy (XPS) were used to examine the composition of the passive films formed on Cu–Ni alloys anodized in an acid. The Flade potential of pure nickel in 0.5 M HClO4 at 25 °C was −0.085 V (vs. SCE), while those of the alloys varied linearly from 0.180 V at 95%Ni to 0.310 V at 47%Ni. Analysis by AES and XPS revealed that (a) the passive region contained nickel and copper in the same ratio as the alloy, and (b) the chemical species of the film were made of NiO and copper oxide (Cu2O and/or CuO). The Flade potential was assumed to be governed by the mixed potential of the formation of such oxides.
X-Ray Study of the Compound Obtained by the Reaction of Nδ-Salicylidene-l-ornithine and Palladium(II) acetate. The Crystal Structure of (Nα-Salicylidene-d-ornithinato) (Nα-Salicylidene-l-ornithinato)dipalladium(II)-Dimethyl Sulfoxide
Authors: Kojima Yoshitane , Matsui Masanori , Matsumoto Keiji 
Published: July 2006

Abstract
X-Ray structure analysis has elucidated that the reaction of Nδ-salicylidene-l-ornithine and palladium(II) acetate in DMF results in the amine exchange and racemization of the ligand, yielding (Nα-salicylidene-d-ornithinato)(Nα-salicylidene-l-ornithinato)dipalladiuna(II). The yellow crystals are monoclinic, a=15.15(2), b=9.80(1), c=15.67(2) Å, β=111.3(1)°, space group P21⁄c, and Z=2. The structure was solved by the Patterson and Fourier techniques and was refined by the least-squares method to R=0.105. The complex molecule has a center of symmetry by which d- and l-Schiff-base ligands are interrelated. Each Pd atom has a square-planar coordination by means of two O and Nα atoms of one ligand, and the Nδ atom of the other one, the two N atoms being in the trans position. The H2Nδ–(CH2)3–CH–Nα fragments of the two ligands bridge the two Pd atoms, giving a 14-membered ring.
Catalytic Activities of a Polyoxime–cobalt Complex for the Addition Reaction of an Alcohol to Acrylaldehyde and for the Polymerization of Styrene
Authors: Kim Sung Jho , Takizawa Takeo 
Published: July 2006

Abstract
A new polymeric cobalt-chelate complex was prepared from cobalt acetate and a polyoxime consisting mainly of 1,2-bis(hydroxyimino)trimethylene units. The polymeric complex in the solid state at 77–300 K, both in air and under a vacuum, gives an ESR signal with a g-value of about 2 and can initiate the polymerization of styrene and catalyze the “Michael”-type addition reaction of an alcohol to acrylaldehyde, yielding exclusively β-alkoxypropionaldehyde, after being treated with phenylthiol and sodium borohydride. The catalytic activities depend greatly on the cobalt content and are much greater than those of its monomeric analogue in composition, bis(dimethylglyoximato)cobalt. The absorption spectrum of the polymeric complex treated with the reagents is similar to that of monomeric or polymeric analogues containing monovalent cobalt atoms.
Oxidation of a Conductive Polymer-TCNQ Salt with Atmospheric Oxygen
Authors: Nakatani Kenji , Sakata Tadayoshi , Tsubomura Hiroshi 
Published: July 2006

Abstract
The oxidation reaction of conductive poly-4-vinylpyridinium (P4VP+) tetracyano-p-quinodimethanide(TCNQ\ewdot) with oxygen has been studied. The main product of this reaction is found to be α,α-dicyano-p-toluoylcyanide. An interesting difference in reactivity was observed between the polymer salt and the ethanol solution of the monomer salt.
A Facile Synthesis of 6-Chloro-d-tryptophan
Authors: Moriya Tamon , Hagio Katsuaki , Yoneda Naoto 
Published: July 2006

Abstract
A nonnutritive sweetener, 6-chloro-d-tryptophan (4), was synthesized from d-tryptophan (1) by nitration, hydrogenation and diazotization, followed by a reaction with cuprous chloride. The optical rotation of 4 agreed with that of an authentic sample which had been prepared by the resolution of racemic 4 methanesulfonate.
Synthesis of Succin-as-eins. II. Dyes Derived from β-(2-Fluoroyl) propionic, β-(3-Phenanthroyl)propionic Acids and Carbazole-3,6-bis(γ-ketobutyric Acid)
Authors: Gopal R , Gupta P C 
Published: July 2006

Abstract
A number of succin-as-eins have been prepared by condensing β-(2-fluoroyl)propionic, β-(3-phenanthroyl) propionic acids and carbazole-3,6-bis(γ-ketobutyric acid) with phenol, resorcinol, catechol, quinol, phloroglucinol, pyrogallol, and orcinol.
Calculation of the Ionization Yield in He by Incident Ar+ and H+Ions with the Initial Energies of 1 and 0.1 MeV
Authors: Ohno Shin-ichi 
Published: July 2006

Abstract
The classical binary-encounter theory was used to calculate the G(He+) due to the direct action of incident particles and that due to the secondary electrons. The results show that both values depend greatly on the quality of the radiation used.
Ranges and Lifetimes of Electrons in Irradiated Liquid Hydrocarbons. Application of the Modified Exponential Distribution Function
Authors: Baba Masatoshi , Fueki Kenji 
Published: July 2006

Abstract
A modified exponential function is developed for the description of the spatial distribution of electrons in irradiated liquid hydrocarbons. This distribution function is applied to calculations of ranges and lifetimes of electrons in a number of hydrocarbons. The temperature dependence of electron ranges is also investigated for some of the hydrocarbons. A calculation is made of electron scavenging in cyclohexane using this distribution function and the forced diffusion approximations.
A Study of the Exchange Reaction between Water and Surface Hydroxyl Groups on Magnesium Oxide by Means of Infrared Diffuse Reflectance Spectroscopy
Authors: Takezawa Nobutsune , Kobayashi Haruo 
Published: July 2006

Abstract
Infrared diffuse reflectance spectroscopy was applied to the study of the exchange reaction between water and surface hydroxyl groups on magnesium oxide. The results led to the conclusion that (i) no reaction occurs via the combination of hydroxyl groups, and (ii) the hydroxyl groups react with adsorbed water reversibly. Two types of hydroxyl groups present on the surface are involved in the rate determining step.
Complex Formation between the Uranyl Ion and Citric Acid
Authors: Ohyoshi Emiko , Oda Junko , Ohyoshi Akira 
Published: July 2006

Abstract
A method to facilitate the analysis of the complex formation by a polybasic acid has been applied to the study of uranyl citrate complexes. The amount of the uranyl ion in equilibrium with the complexing agent was determined by the cation-exchange method. In this experiment, the uranyl-ion concentration was kept within a 105–106 M range in order to eliminate polymeric species. By using a series of solutions prepared so as to keep [H3Cit−] nearly constant and to vary [H2Cit2−] and [HCit3−] in the 2.2–2.9 pH range, it has been found that three kinds of complexes, UO2H3Cit+, UO2H2Cit, and UO2HCit−, were present in the solution. Approximate values of their formation constants were obtained.
The Syntheses and Spectroscopic Investigation of Copper(II), Nickel(II), and Cobalt(II) Complexes of 8-Quinolinecarboxamide
Authors: Noji Masahide , Kidani Yoshinori , Koike Hisashi 
Published: July 2006

Abstract
The syntheses of the bivalent metal complexes of 8-quinolinecarboxamide (abbreviated as 8-QCA) were attempted; the complexes obtained have the compositions of M(8-QCA)2X2 (M=Cu(II), Ni(II), and Co(II) ions; X=Cl−, Br−, I−, and NO3−) and Cu(8-QCA)Cl2. The diffuse reflectance, the infrared and far-infrared spectra, and the magnetic moments of these metal complexes were measured. The coordination sites of 8-QCA have been suggested for the amide oxygen and the quinoline nitrogen from the diffuse reflectance spectra and the infrared spectra. The values of 3.13–3.21 B.M. and 4.81–5.03 B.M. were observed for Ni(8-QCA)2X2 and Co(8-QCA)2X2 respectively. From these magnetic moments, an octahedral structure has been proposed for the nickel and the cobalt complexes, whose far-infrared spectra (600–200 cm−1) also supported this structure, with a trans-planar coordination of the 8-QCA molecules around the metal ions. Since the Cu(8-QCA)2X2 complexes are of the mononuclear form, judging from the magnetic moments of 1.87–1.93 B.M., and since the far-infrared spectra suggested a structure belonging to the C2h point group, a distorted octahedral configuration is conceivable.