bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isotopic Exchange Reaction between Cyclohexane and Deuterium on Evaporated Tungsten Films
Authors: Hayakawa Teruo , Sugiura Toshio 
Published: July 2006

Abstract
Isotopic exchange reaction between cyclohexane and deuterium over evaporated tungsten films has been studied mass-spectrometrically at the temperature range 79∼111°C. The present results are summarized as follows;
1) The production of highly deuterated products in the initial stage of this exchange requires a process of multiple exchange.
2) Evaporated tungsten films showed, however, little tendency for multiple exchange, while evaporated molybdenum films promoted multiple exchange to a large extent.
3) One can observe no discontinuities which separate the concentrations of C6H6D6 and C6H5D7.
4) It seems reasonable to consider that marked discontinuities between C6H6D6 and C6H5D7 observed by Anderson and Kemball for evaporated films of rhodium and palladium must not be attributed to the characteristic chair conformation of the cyclohexane molecule.
5) The deuterium isotope effect gives no significant influence upon the overall reaction of this exchange.
The Mechanism of the Isotopic Exchange Reaction between Cyclohexane and Deuterium on Evaporated Metal Films
Authors: Hayakawa Teruo , Sugiura Toshio 
Published: July 2006

Abstract
The theoretical treatments of the isotopic exchange reaction between cyclohexane and deuterium over evaporated metal films have been studied. The present results of the theoretical calculations were compared with the experimental results already obtained by the present authors for evaporated films of molybdenum and tungsten. The present results are summarized as follows:
1) The agreements between the theoretical and the experimental values of the initial product distributions for these metal films are well maintained.
2) The initial rate of tripping of the adsorbed radicals on evaporated films of molybdenum or tungsten at each temperature is considerably greater than that of desorption (or chemisorption) of cyclohexane. This coincides well with the experimental fact that the rate-determining step of this exchange reaction may be attributed to desorption of the adsorbed radicals.
3) The differences between the activation energy of tripping of the adsorbed radicals and that of desorption for evaporated films of molybdenum and tungsten amount to 6.8 and 9.7 kcal./mol. respectively.
Alkylalkoxypolysiloxanes. VII. Lower Members of tert-Butoxy End-blocked Dimethylpolysiloxanes with One to Four Silicon Atoms
Authors: Okawara Rokuro , Imaeda Sh\={o}hei 
Published: July 2006

Abstract
1) tert-Butoxy end-blocked dimethylpolysiloxanes were prepared from dimethyldichlorosilane, tert-butanol and water by the use of pyridine as an acid acceptor.
2) The lower members of those polysiloxanes having one to four silicon atoms were characterized.
The Ignition of Methane-Oxygen Mixture by Shock Wave
Authors: Suzuki Momotaro , Miyama Hajime , Fujimoto Shiro 
Published: July 2006

Abstract
Using the shock tube, the authors measured the minimum ignition pressure P1 of the reservoir for the methane-oxygen mixture of various pressure P0 and various compositions, and obtained the following results.
1) The higher the value of P0, the easier the ignition.
2) The concentration range of methane in the gaseous mixture for shock ignition is 3—42%, and the minimum value of P1/P0 or the ignition temperature, was found at a gaseous mixture of about 20—25% methane.
3) The ignition easier is by the use of the shock tube with conical end rather than with the plane end.
4) Shock ignition temperatures estimated indirectly were found to be remarkably lower than the thermal ignition temperature.
Studies on Micelle Formation in Non-polar Solvent by Thermistor
Authors: Kitahara Ayao 
Published: July 2006

Abstract
The apparent mean aggregation number (Z) of dodecylammonium carboxylate in cyclohexane was obtained from the vapor pressure depression measurement by the use of a pair of thermistors. The monomer concentration (C1) was calculated from Kreuzer’s equations. The C1 was nearly independent of the concentration. The true aggregation number (λ) was obtained, assuming that the micelle is monodisperse. The cmc extraploated from C1 agreed approximately with those by other methods.
The change of the heat content associated with micelle formation was calculated from the change of the cmc with the temperature and from the temperature dependence of the equilibrium constant for the λ-mer aggregation. Both agreed roughly with each other.
Studies on the Cobalt(III) Complexes Containing Only One Chelate Ring. III. Rotatory Dispersion of Tetrammine-I-leucinato-cobalt(III) Perchlorate, [Co (NH3)4(I-leuc)](ClO4)2
Authors: Shimura Yoichi 
Published: July 2006

Abstract
A new complex compound, [CoIII(NH3)4(l-leuc)](ClO4)2, has been prepared, in which the asymmetric center is only on a carbon atom of the ligand leucinate ion. From the measurements of the visible and the ultraviolet rotatory dispersion of this compound, it has been concluded that the so-called “vicinal effect” exists between the cobalt atom and the asymmetric carbon atom.
The rotatory dispersion measurements have also been made for d-[Co en2 (l-leuc)]Cl2, d-[Co en2 (NH3)Cl(2)(1)]Br2 and d-[Co en3]Br3·2H2O. On the basis of these data the relation of the splitting of the first absorption band with the so-called anomalous rotatory dispersion has been discussed. Thus it has been shown that the anomalous rotatory dispersion of [Co(NH3)4(l-leuc)]2+ or of [Co en2 (NH3) Cl]2+ is explicable by assuming the overlap of the two inversive dispersions, Ia and Ib, which correspond to the component bands, Ia and Ib, of the split first absorption band.
In agreement with the observations by several previous authors, it has been shown that all the complexes studied scarecely show the anomalous rotatory dispersion in the vicinity of their second absorption bands.
Formation and Aging of Precipitates. VI. Morphology of Crystals in Various Vanadium Pentoxide Sols by Electron Microscopy
Authors: Takiyama Kazuyoshi 
Published: July 2006

Abstract
Vanadium pentoxide sols were prepared by Biltz’, Müller’s and ion exchange method, and the crystals in the sols were observed with an electron microscope. The crystals in Biltz sol were small fibrils at first, but they grew into long fibrous crystals upon aging. The crystals in Müller and ion exchange sols were fibrils and needles respectively and hardly grew at all. The growth of the fibrous crystals in Biltz sol is likely to be due to the recrystallization of the fibrils.
Partial Hydrogenation of 1,4-Butynediol
Authors: Fukuda Tosao , Kusama Tokishige 
Published: July 2006

Abstract
1. The effect of lead acetate and the poisons on the Pd-CaCO3 catalyst was studied with the hydrogenation of 1,4-butynediol.
2. The hydrogenation of 1,4-butynediol with the Pd-CaCO3 catalyst at room temperatures takes place in two distinct steps; the first step is the hydrogenation to 1,4-butenediol, and the second is its hydrogenation to 1,4-butanediol.
3. When Pd-CaCO3 catalyst is poisoned by increasing amount of lead acetate, the activity for the hydrogenation of 1,4-butynediol increases at first, and then gradually decreases as the poisoning proceeds. On the other hand, that for the hydrogenation of 1,4-butenediol simply decreases with increasing amount of lead acetate.
4. The hydrogenation of 1,4-butynediol with Pd-CaCO3 catalyst is slightly retarded by quinoline, but not by pyridine or piperidine. On the other hand, the hydrogenation of 1,4-butenediol is retarded to some extent by pyridine, more markedly by piperidine, and stopped almost completely by quinoline. The effect of these bases is almost the same when they are applied to the Pd-CaCO3 catalyst poisoned by lead acetate.
5. The partial hydrogenation of 1,4-butynediol can be achieved by using quinoline, but not by using pyridine or piperidine.
6. The selective hydrogenation may result from the strong adsorption of 1,4-butynediol on the catalyst surface. When the catalyst adsorbs the poisons, the properties of the catalyst surface may be changed. As a result, the selectivity of the catalyst may become very characteristic. Consequently, the selective hydrogenation may take place as observed.
Polarographic Investigations of Vitamin C. II. On the Reduction Waves of Some Conjugated Tricarbonyl Compounds as Related Compounds of Dehydro-l-ascorbic Acid
Authors: Ono Sozaburo , Takagi Masanosuke , Wasa Tamotsu 
Published: July 2006

Abstract
Alloxan, dehydro-reductic acid and mesoxalaldehyde show reduction waves which are similar to that of dehydro-l-ascorbic acid. The half-wave potentials of alloxan, dehydro-reductic acid, dehydro-l-ascorbic acid and mesoxalaldehyde in pH 3.5 are −0.05, −0.27, −0.42 and −0.35 V. (vs. N.C.E.), respectively.
Of these four substances, the lower the height of the reduction wave, the greater both the shift of the half-wave potential of the anodic wave of the corresponding reduced form from the standard oxidation-reduction potential of the system and the temperature coefficient of the height of the reduction wave.
Inactive forms of these substances at the electrode reaction may be the hydrated ones as proposed in the case of dehydro-l-ascorbic acid.
Alloxan has been proved to be polarographically reversible by the controlled potential electrolysis and the half-wave potential of the reduction wave coincides with that of the oxidation wave of dialuric acid, while no such observations have been made with the other three.
Fractionation of Ribonuclease-resistant Fraction on ECTEOLA-cellulose
Authors: Tanaka Kentaro 
Published: July 2006

Abstract
RNase-resistant material obtained from yeast RNA was fractionated on an ECTEOLA-cellulose column. The elution was performed with sodium chloride-neutral phosphate buffer as solvent, the concentration of sodium chloride being increased by either gradient or stepwise procedure. Separation of oligonucleotides seemed to be affected by their molecular size. The products of larger molecular weight present in pancreatic-RNase digests of yeast RNA were very rich in guanylic acid.
Phase Relationship in the System 3CaO·P2O5–MgO·SiO2–SiO2
Authors: Sata Toshiyuki 
Published: July 2006

Abstract
The phase relationship in the system 3CaO·P2O5–MgO·SiO2–SiO2 was investigated by the usual quenching method. In the partial system 3CaO·-P2O5–SiO2, the existence of solid solution and the change of the transition temperature of α–β tricalcium phosphate were not found by X-ray examinations.
The partial system 3CaO·P2O5–MgO·SiO2 is pseudo-binary, whose eutectic is at 1246°C and 40% 3CaO·P2O5. In this system, β-3CaO·P2O5, always appeared in quenched samples, has a maximum solid solubility of 7±2% MgO·SiO2.
The system 3CaO·P2O5–MgO-SiO2–SiO2 has two quintuple points, the one an alteration point and the other a ternary eutectic at 50.5% 3CaO·P2O5, 15.0% MgO, 34.5% SiO2 that melts at 1230±4°C.
This system is of great importance to the manufacture of the fused phosphatic fertilizer and the bone ash magnesia porcelain. For instance, in this system, the lower liquidus groove lies at higher silica side along 3CaO·P2O5–MgO-SiO2, in accord with the results of cone fusion and melting point measurements already obtained by Kiyoura and Sata.
Ion Exchange in Concentrated Solutions. III. Magnesium Chloride-Hydrochloric Acid and Aluminum Chloride-Hydrochloric Acid Systems
Authors: Ohtaki Hitoshi , Yamasaki Kazuo 
Published: July 2006

Abstract
Ion-exchange equilibria in the concentrated solutions of magnesium chloride-hydrochloric acid and aluminum chloride-hydrochloric acid system were studied. Amounts of the water present in the resin at equilibrium were estimated for these systems. In the magnesium chloride-hydrochloric acid system a large part of magnesium in the resin exists as MgCl+ at equilibrium when the concentration of hydrochloric acid is high. Selectivity coefficients of magnesium chloride-hydrochloric acid and of aluminum chloride-hydrochloric acid systems were calculated.
Rate of Methanol Synthesis
Authors: Uchida Hiroshi , Ogino Yoshisada 
Published: July 2006

Abstract
Over a wide range of the total pressure and the ratio of hydrogen to carbon monoxide measurements on the methanol synthesis have been made at different temperatures at different space velocities. Relations of the total pressure to the methanol concentration and the conversion efficiency, and the dependence of the methanol concentration and the conversion efficiency on the ratio of hydrogen to carbon monoxide are presented.
Based on the assumption of the logarithmic adsorption isotherm and of the methanol desorption as the rate determining step, the rate equation for the methanol synthesis has been derived, which follows:
r=k_d{(P_COP^2_H2)^0.7-P_CH3OH·(P_COP^2_H2)^-0.3/K}
The equation has proved capable of representing our experimental results satisfactorily over relatively wide ranges of the pressures, the ratio of hydrogen to carbon monoxide and the space velocity.
Electronic Spectra of Acridine and Phenazine
Authors: Mataga Noboru 
Published: July 2006

Abstract
The electronic spectra of three-ring nitrogen heterocycles have been calculated by the perturbation method based on the Hartree-Fock self-consistent field theory. There is a satisfactory agreement in general between the calculated the and observed excitation energies and oscillator strengths, and the mechanism of the electronic transitions in these molecules has been discussed in detail.
A Study on the Micellar Solutions of Sodium Oleate and Elaidate
Authors: Tamamushi Bun-ichi , Shirai Michio , Tamaki Kunio 
Published: July 2006

Abstract
The electrical conductivity, the interaction with pinacyanol iodide, the degree of hydrolysis, and solubilization power for benzene have been measured for sodium oleate and elaidate.
The conductivity behavior of these salts is consistent with the experimental result for hydrolysis and the latter result is also consistent with that of solubilization measurement. The result of dielectric polarization is also compatible with other results.
All these experimental results show that sodium elaidate has a slightly greater tendency towards micelle formation than sodium oleate.
Fluorescence Quenching due to the Interactions between π-Electron Systems in the Excited State and Acid-Base Relation: Nitrogen Heterocycles, Naphthylamine and Naphthol in Aqueous and Alcoholic Solutions
Authors: Mataga Noboru 
Published: July 2006

Abstract
The acid-base relation in the fluorescence quenching in aqueous and alcoholic solutions, due to the interaction between π-electron systems in the excited state, has been pointed out. Roughly speaking, this is parallel with the fluorescence quenching due to hydrogen bonding between the π-electronic fluorescer and quencher in non-polar solvent. Remarkable solvent effects on the quenching efficiency have been found and some important roles of hydrogen bonding in this phenomenon have been suggested.
Colorimetric Determination of Bivalent Copper Using Sodium Alizarin-3-Sulfonate as a Reagent
Authors: Mukherji Anil K , Dey Arun K 
Published: July 2006

Abstract
The formation of a 1:1 copper chelate with sodium alizarin-3-sulfonate, having λmax at 500 mμ has been reported. The color formation has been applied to the colorimetric determination of copper on a micro-scale. The color has been found to be stable between pH 3.20 and 7.50, at temperatures 20∼30°C. The sensitivity of the reagent is 6.4 p.p.m. of the copper ion. The interference by a large number of cations and anions has been studied and the tolerance limits are quantitatively determined spectrophotometrically. It has been recommended that the reagent is suitable for the colorimetric determination of copper(II) on a micro-scale and the conditions have been prescribed.
Further Notes on the Ideal Mixture Law for Viscosity
Authors: Ishikawa Tetsuya 
Published: July 2006

Abstract
In the previous paper on the same subject the author made an erroneous explanation on the result of Na–K system.
Comparison of Ishikawa’s formula with Drucker and Kassel’s formula leads to the new relation, K=\varphi2M2a2⁄\varphi1M1a1, from which the association degrees of 27 kinds of liquid have been evaluated.
By the use of this relation, the abnormally high value of K of Na–K system has been proved to be normal.
Two systems of different crystal forms, Pb–Sn and Pb–Bi, and six systems composed of isomorphic compounds, benzyl-aniline, benzalaniline, dibenzyl, azobenzene, and stilbene are added for elucidating the degradation of atomic or molecular complexity with rise of temperature.
On the Nature of the Red Adduct of Styrene with Sodium
Authors: Hirota Kozo , Kuwata Keiji , Morigaki Kazuo 
Published: July 2006

Abstract
Paramagnetic resonance absorption could be observed on the solution of the pure red adduct, which was prepared according to the method reported by the present writers. The adduct, therefore, produces a radical anion consisting of odd electrons by dissociation. The proposition on the structure of the red adduct in the previous report was thus confirmed.
Dispersed Structure of Chromia-Zinc Oxide Catalyst System
Authors: Matsunaga Yoshio 
Published: July 2006

Abstract
Chromia-zinc oxide catalysts have been prepared by the impregnation method using non-sintered and sintered zinc oxide as carriers. Measurements of magnetic susceptibility have been made for these two series of catalysts of varying composition. The values of gram susceptibility and the mean oxidation number of chromium in the samples oxidized with air at room temperature are nearly independent of the content of chromium. After oxygen-treatment at 250° or 450°C has been carried out, however, the surface oxidation becomes appreciable in the samples of low content of chromium, and the variations in the susceptibility and the mean oxidation number suggest that the dispersed structure of chromia depends on the composition of the catalyst. It appears that chromic ions are distributed in the two compounds, namely the thin layers of chromia on the catalyst surface and the relatively large crystallites of zinc chromite and, as the chromium content is decreased, the former becomes more important. By comparison between the two series examined in the present work, it is suggested that the form of the magnetic susceptibility-composition isotherm is governed by the reactivity of the carrier and the cause of the discrepancy between the results obtained by Shida et al and by us may be due to the difference between the kinds of chemical behavior of the zinc oxides employed as carrier.
The Separation of Polythionates with Anion-Exchange Resins
Authors: Iguchi Akira 
Published: July 2006

Abstract
1) The distribution coefficient of di-, tri-, tetra-, and penta-thionates between anion-exchange resins and hydrochloric acid solution was measured. The adsorb-ability of the polythionates increases with the number of sulfur atoms in the ion, i. e. pentathionate&gt;tetrathionate&gt;trithionate&gt;dithionate.
2) The separation of polythionates was accomplished by the anion-exchange chromatography by the use of hydrochloric acid in various concentrations as the eluant.
3) The application of anion-exchange chromatography to the analysis of Wackenroder’s liquid was studied.
On the Determination of Fine Structure of Cellulosic Fibers
Authors: K\={o}shiro Taketoshi , Yagami Kazuo , Shiratsuchi Eiichiro , Fujimura Toshikazu 
Published: July 2006

Abstract
In order to clarify the fine structure of rayon staple, it may be necessary to estimate not only the total crystallinity but also the distribution of crystalline size and quality. For this purpose, various methods which seemed to remove the amorphous region without recrystalliza-tion, were studied.
Methanolysis is affected by water content in the mixture and its residue may still contain an amorphous region because of its high accessibility. The recrystalli-zation may be possible during not only hydrolysis but also methanolysis.
The hydrolysis after pretreatment is not very effective to prevent recrystallization and may destroy crystalline region. Moreover, its procedure is troublesome.
The oxidizing-hydrolysis, which shifts the crystalline length distribution toward slightly higher DP region diminishing the shoulder on higher DP side and gives the lowest levelling-off accessibility, holds out considerable promise for the elucidation of the original crystalline structure. But its high solubility in alkaline solution may be derived from a carboxyl group formed during oxidation or from the cracks in a hydrogen-bond train of crystallites. Therefore, problems to study still remain.
The crystalline region of viscose rayon staple seems to have the chain-length distribution, which extends to a DP of ca. 40 and shows one maximum between the DP of 6 and 10.
A Theoretical Consideration of Simple Catalytic Reactions. Decomposition of Gaseous Hydrides
Authors: Tamaru Kenzi 
Published: July 2006

Abstract
The decomposition of arsine, stibine, tin hydride, methane, germane, hydrogen selenide and nickel carbonyl on the surface of the corresponding elements have been discussed from the statistical mechanical view-point. As these decompositions are catalytic reactions of the simplest type, several reasonable assumptions enable us to calculate the rates of each elementary step of each reaction and hence to decide the rate-determining step in a semi a priori fashion. It is shown that the calculations impose definite limitations to the possible mode of decompositions of this kind.
The Infrared Spectra of Methylhydropolysiloxanes
Authors: Sakiyama Minoru 
Published: July 2006

Abstract
1) Infrared spectra of some methylhydropolysiloxanes involving the units, H(CH3)2SiO1⁄2 and H(CH3)SiO2⁄2, were studied. The assignments of Wright and Richards with methylpolysiloxanes were comfirmed in this study.
2) The stretching and the bending band involving an Si–H bond are found in the range 2120–2170 cm−1 and 760 cm−1, respectively.
3) Characteristic absorption bands of the unit H(CH3)2SiO1⁄2 are observed near 900 cm−1 and 830 cm−1, while the unit H(CH3)SiO2⁄2 does not give the characteristic band and the band related with this unit is different in each compound.
Mercury Photosensitized Reaction of Cyclo-octatetraene and the Comparison with the Direct Photochemical Reaction
Authors: Yamazaki Hideo 
Published: July 2006

Abstract
The reaction products of both the mercury photosensitized reaction and the direct photochemical reaction are the same, i.e. acetylene, benzene, orange-colored liquid (presumably bicyclo form of C8H8), polymer and a trace of styrene; the noncondensable products at liquid nitrogen temperature such as hydrogen and methane were not detected.
A quantitative experiment has been made on the decomposition reaction, in which cyclo-octatetraene shows a similar behavior to ethylene in the pressure dependence of the quantum yield. The quantum yields of the decomposition are of the same magnitude in both the mercury photosensitized and the direct photochemical reaction. The result shows that the two reactions proceed via the same excited state (probably triplet), directly or indirectly.
An investigation has also been made on the polymerization reaction, for which the total pressure change and the absorption spectrum of the reaction products have been examined in the course of the reaction. It is concluded that the polymerization takes the place via orange-colored liquid as an intermediate.
In the study of the reaction of hydrocarbons with Hg(63P1) atom a great deal of evidence has now been accumulated which shows the fact that the reaction always accompanies hydrogen production. The mercury photosensitized reaction of cyclooctatetraene is one of the rare exceptions in this generality.