bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthetic Studies on the Benzofuran Derivatives. Part III. Reaction of 7-Hydroxy-8-formyl-2-methylisoflavone with Ethyl Bromomalonate and Synthesis of Furano(2′,3′:7,8)-2-methylisoflavone
Authors: Matsumoto Takashi , Kawase Yoshiyuki , Nanbu Mutsumu , Fukui Kenji 
Published: July 2006

Abstract
5′-Carbethoxy-furano(2′,3′: 7,8)-2-methylisofiavone (IV) was obtained from 7-hydroxy-8-formyl-2-methylisoflavone (III) and ethyl bromomalonate by Tanaka’s method for benzofuran synthesis. The condensation product IV was hydrolyzed to give the free acid V, which was decarboxylated in quinoline with copper powder to yield furano(2′,3′: 7,8)-2-methylisoflavon (VIII). The structures of the condensation product and its derivatives were discussed.
Electronic States of p-Benzoquinone. IV. Infrared Spectrum and Assignment of Vibrational Frequencies in the Ground Electronic State
Authors: Anno Tosinobu , Sadô Akira 
Published: July 2006

Abstract
The infrared absorption spectra of p-benzoquinone in carbon disulfide and carbon tetrachloride solutions in rock salt region are measured and interpreted together with the Raman data reported by Stammreich and Forneris. A complete, although more or less tentative, assignment of the fundamental frequencies to modes of vibrations is proposed.
Thermal Decomposition of Chromic Anhydride Supported on Alumina
Authors: Matsunaga Yoshio 
Published: July 2006

Abstract
The thermal decomposition of chromic anhydride supported on gamma-alumina at 300°, 350° and 450°C was examined by chemical analysis and by magnetic susceptibility measurements. The stabilization of the plus-six oxidation state of chromium in a highly dispersed state was confirmed by the present experiments. In addition, by comparing the oxidation number and the magnetic susceptibility of chromium, it was found that the behavior of supported chromic anhydride in large aggregates is also anomalous. Contrary to the case of the thermal decomposition of massive chromic anhydride, the intermediate oxides CrO2.6 and CrO2.4∼5 were not found. The large aggregates of chromic anhydride on alumina lose the greater part of their active oxygen at relatively low temperatures and crystallize continuously into chromia with further loss of oxygen.
π-Electronic Structures of α-Naphthoquinone and Anthraquinone
Authors: Kuboyama Akira 
Published: July 2006

Abstract
Electronic structures of p-benzoquinone, α-naphthoquinone, and anthraquinone were studied with the simple MO method, using the same integral values as adopted in the SCF MO calculation for p-benzoquinone. As for charge distributions, the negative charges of oxygen atoms slightly increase in the order p-benzoquinone, α-naphthoquinone and anthraquinone. The calculated dipole moment (2.2 D) of α-naphthoquinone seems too large. As for bond orders, the reasonable results were obtained. Two problems concerning the near UV absorption bands (1. a similarity among the π–π transition bands of the three p-quinones, 2. a relative magnitude of the n–π transition energy in the order of p-benzoquinone, α-naphthoquinone and anthraquinone) can be clearly explained with the calculated results. Especially, the effect of the electrondonating group on the π–π transition bands of α-naphthoquinone and anthraquinone can also be favourably explained, according to the modified Herzfeld-Nagakura-Baba’s formula, with the calculated results. It seems sure that for the o-quinone type compounds the similar result can be obtained with the same method as used for the p-quinone type compounds.
Studies on the Interaction of Surface Films with Solute in Solution. I. Potentiometric Titration of Aqueous Dye Solution and Calculation of Ionization Constant of Dye
Authors: Muramatsu Mitsuo 
Published: July 2006

Abstract
Change of pH of aqueous dye solution was traced by titrating with the solution of hydrochloric acid or sodium hydroxide. From these data, ionization constants for each ionizing group in chrysoidine, methyl orange, tropäolin OO and aluminon were calculated, making use of equations based on the law of mass action with a specially-selected parameter. The validity of the ionization constants thus determined were confirmed by reasonable coincidence of the titration curves obtained by calculation using these data with those observed, over the wide range of pH. In the case of Congo red, however, it seemed better to treat it as a high-molecular electrolyte. Ionization constants calculated by an equation based on such a treatment explain the experimental result better than those based on the treatment similar to the case of other simple dyes.
Studies on the Interaction of Surface Films with Solute in Solution. III. Effect of Dissolved Dyes upon the Monolayer of Octadecylamine
Authors: Muramatsu Mitsuo 
Published: July 2006

Abstract
The interaction between octadecylamine in monolayer and various dyes in aqueous substrate under varying pH was studied. Such a basic dye as chrysodine or crystal violet remarkably expanded the monolayer when pH of the solution was in a certain range on alkaline side. This has been attributed to the interactions between the molecules of dye themselves and that between dye and octadecylamine. Thus, it is mainly dipolar and van der Waals’ attraction, which was considered to be overshadowed by ionic repulsion when substrate pH was in the other region. Additional possibility of ion-dipole attraction due to the remaining charge of the monolayer was discussed in connection with the ionizations of octadecylamine and basic dyes.
In contrast with this, the monolayer expanded remarkably when it was spread on an acidic solution of acid dye. The behavior could be accounted for by the sum of ionic, dipolar and van der Waals’ attraction. The possibility of the formation of colloidal aggregate of dye with which octadecylamine interacts has been discussed, in connection with the effect of metal ion in the substrate upon the monolayer of stearic acid.
Studies on Serine Peptides. IV. Synthesis of l-Seryl-l-histidyl-l-leucyl-l-valyl-l-glutamic Acid with Strepogenin Activity.
Authors: Okawa Kenji 
Published: July 2006

Abstract
l-Seryl-l-histidyl-l-leucyl-l-valyl-l-glutamic acid having strepogenin activity has been synthesized from O-Bz-l-serine as a starting material in a good yield by Sheehan’s dicyclohexylcarbodiimide method.
Heats of mixing of Dichloroethan with Non-polar Liquids
Authors: Amaya Kazuo , Fujihsiro Ryoichi 
Published: July 2006

Abstract
For three solution of dichloroethane which is regarded as a typical molecule having internal rotation isomers, the excessive enthalpies arising from the internal reaction were calculated according to a simple theory derived from the Onsager model, and were compared with the result obtained from the measurements of heats of mixing for these solutions. The agreement was not very good and it seems to owe to the overestimation of the reaction field based on the simple molecular modern in the Onsager model. Especially for the dichloroethane-benzene system, special interactions may be expected to exist between dichloroethan and benzene.
Studies on Polymerization and Depolymerization of ε-Caprolactam Polymer. V. On the Reaction Mechanism of the Catalytic Polymerization of ε-Caprolactam by Alkali Metal
Authors: Yumoto Hirosuke , Ogata Naoya 
Published: July 2006

Abstract
When alkali metal reacts with ε-caprolactam, it was found experimentally that hydrogen and N-alkali metal ε-caprolactam are produced at first. The rate of polymerization of ε-caprolactam in the presence of N-alkali metal derivative was studied. The change in the electric conductivity during polymerization was also measured. In this case the polymerization is expected to proceed by an ionized molecule.
The Determination of Boron in Glass Using Radium-Beryllium Neutron Source (Neutron Absorption Technique)
Authors: Kusaka Yuzuru 
Published: July 2006

Abstract
The neutron absorption technique using radium-beryllium neutron source has been show to be useful for rapid assay of boron in the samples containing other low cross-section elements. This method may also be useful for the analyses of other high cross-section elements.
The writer wishes to express his hearty thanks to Professor Masayoshi Ishibashi of Kyoto University and President Bunsaku Arakatsu and other members of the Chemical and Physical Laboratory of K\={o}nan University for their kind guidance and valuable advice through this study, to Professor Shoji Tsuchihashi of K\={o}be University for furnishing glass samples, and to Mr. Haruo Tsuji for considerable help in repeating and checking the procedures in many of the experiments.
Rotatory Dispersion of Metallic Co-ordination Compounds. I. Rotatory Dispersion in the First and the Second Absorption Bands of Cobaltic Compounds
Authors: Hidaka Jinsai , Yamada Shoichiro , Tsuchida Ryutaro 
Published: July 2006

Abstract
Rotatory dispersions in the visible and the ultraviolet region have been determined with cis-[Co en2Cl2]Cl and cis-[Co en2ClNO2]Cl, and dispersion curves have been analyzed by the method of successive approximation.
Both the complexes show two inversive dispersions in the wave-length region of the “first absorption band”, and only one dispersion in the region of the “second absorption band”.
The magnitude of those dispersions was found to be of the same order.
An inversive dispersion was also observed in the region of the “specific absorption band”.
In the wave-length region of the “first absorption band”, there appear two inversive dispersions due to the component absorptions, in accordance with the dichroism measurement. As for the inversive dispersions in the region of the “first absorption band”, the sign of the Cotton effect for the one is reverse to that for the other in the violeo-salt, but in the cis-chloronitro-salt, the Cotton effect is the same for the two components.
A possibility of determining the absolute configuration was suggested from the rotatory dispersion curve in the wavelength region of the “first absorption band”.
Studies on the Synthesis of Metal Complexes. IV. The Cobalt (III) Complexes of Ammoniatriacetic Acid
Authors: Mori Motoshichi , Shibata Muraji , Kyuno Eishin , Okubo Yoshito 
Published: July 2006

Abstract
The cobalt(III) complexes containing ammoniatriacetato group (ata) as a quadridentate ligand are newly prepared:
i) α-K[Co ata(OH)(OH2)]·2H2O
ii) β-K[Co ata(OH)(OH2)]·3H2O
iii) K2[ataCo(OH)2Co ata]·6H2O
iv) K2[Co ata(CO3)]·H2O
v) K2[Co ata(C2O4)]·H2O
In order to determine the structural formulae of these complexes, their visible, ultraviolet and infrared spectra were measured, as well as their thermal decomposition and their potency to coagulate ferric oxide sol.
On the Absorption Spectra of Hexamminecobalt (III) and Related Complexes. II. Theoretical Study on Shifting and Spilitting of the First and the Second Band Due to Substitution of Ligands
Authors: Yamatera Hideo 
Published: July 2006

Abstract
A general theory has been presented to discussed spectra of transition metal complexes and to apply them to the problem of shifting and spliting of the absorption band of the cobalt (III) complex due to replacement of some of the ligends. The problem was discussed from the molecularorbital and the electrosttaic point of view.
Formation and Aging of Precipitates. IX. Formation of Monodisperse Particles (2) Barium Sulfate Precipitate by EDTA Method
Authors: Takiyama Kazuyoshi 
Published: July 2006

Abstract
Monodisperse spindle-shaped particles of barium sulfate were formed by means of the decomposion of barium-EDTA complex with hydrogen peroxide in the presence of sulfate. The logarithm of the size of the particle produced was linear with the logarithm of the concentration of reagents. The particles grew at the same rate of liberation of barium ion from the complex. The number of particles per unit volume of the reaction mixture was kept constant during the growth process of particles.
Kinetics of Hydrolytic Reaction Catalyzed by Crystalline Bacterial α-Amylase. I. The Influence of pH
Authors: Ono Sôzaburo , Hiromi Keitaro , Yoshikawa Yoshiko 
Published: July 2006

Abstract
The influence of pH on the rate of the hydrolytic reactions of amylose catalyzed by the crystalline bacterial α-amylase of Bac. amyloliquefaciens Fukumoto has been examined at various substrate concentrations and temperatures.
The apparent Michaelis constant \={K}m is constant over the pH range examined (3.6∼8.4), whereas the apparent rate constant k2 for the breakdown of the enzymesubstrate complex into the reaction products and free enzyme decreases on both the acid and the alkaline side of the optimum pH 5.85. The relative rate - pH curves are not affected by the substrate concentration. From these facts, it is concluded that at least two ionizable groups in the enzyme are involved in the breakdown of the complex, although these groups are not directly responsible for the formation of the enzyme-substrate complex.
The ionization constants and the heats of ionization of the two groups involved in the reaction have been determined. From these values, the ionizing groups are inferred to be the carboxyl and imidazole (or amino) groups. The ionized form of the former and the positively charged form of the latter are considered to be essential for the breakdown process.
Tentative mechanisms of the reaction are proposed.
Surface Chemistry of Synthetic Protein Analogues. VII. Polytyrosine and its Related Polypeptides
Authors: Isemura Toshizo , Yamashita Takuya 
Published: July 2006

Abstract
The monolayer properties of synthetic polypeptides which have phenolic OH groups in the side chains such as poly-l-tyrosile and poly-Dl-tyrosine were studied to investigate the effect of hydrogen bonding by tyrosyl OH groups. Poly-o-benzyl-Dl-tyrosine and poly-Dl-phenylalanine were also studied for comparison.
At air/water interface poly-l-tyrosine and poly-Dl-tyrosine occupy much smaller aerea per residue than any other poly peptide films, and have very small surface moment, if they were spread from the solution in pyridine and isopropyl alcohol mixture. These polypeptides might be spread in a strict sense not in an extended monolayer but in a coiled state, suggesting the hydrogen bond between phenolic OH and –CO– or –NH– groups in the main chain. On the alkaline substrate the film expands considerably because of the breaking of hydrogen bonds by the ionization of phenolic OH. At petroleum ether/water interface, the film is also expanded by releasing of van der Waals force. Interfacils moment changes its sign due to whether the aqueous phase is acid. or alkaline. It suggests that p-hydroxybenzyl groups are in the oil phase at oil/acid solution, whereas they are in the aqueous phase at oil/alkaline solution. Poly-l-tyrosine assumes the configuration very similar that of poly-l-tyrosine is spread from a solution in dichloroacetic acid which is a strong hydrogen bond braking agent.
Poly-o-benzyl-Dl-tyrosine gives a monolayer which is somewhat more condensed than poly-Dl-phenylalanine at air/water interface, whereas it occupies a larger area per residue than poly-l-tyrosine, poly-Dl-tyrosine and poly-Dl-phenylalanine at oil/water interface. All these findings are caused by the existence of very large side chains in poly-o-benzyl-Dl-tyrosine.
Synthesis of Aspartic and Glutamic Hydrazides and their Chromatographic and Ionophoretic Separation. C-Terminal Groups of Whale Insulin
Authors: Narita Kozo , Ohta Yumiko 
Published: July 2006

Abstract
Aspartic α- and β-monohydrazides and aspartic α, β- and glutamic α, γ-dihydrazides were prepared and their qualitative separation has been performed by means of paper ionophoresis and chromatography. During ionophoresis in acidic medium, the dihydrazide partially decomposed into the isomers of monohydrazides liberating hydrazine. The hydrazinolysis products of whale and beef insulins were analyzed by the aid of elution chromatography on a Dowex 50 column and it was observed that the C-terminal positions were occupied by each one mole of alanine and asparagine in both cases. Furthermore, the present experiments suggested that all of the non-terminal carboxyl groups of the hormone belonged to only glutamic acid residues. Complicated reaction of the acidic amino acids or their amides with hydrazine was discussed.
Thermodynamic Studies on Cobalt Complexes. IV. On the Thermal Dissociation and the Solubility of Aquopentamminecobalt(III) Chloride
Authors: Mori Motoshichi , Tsuchiya Ryokichi , Okano Yasuhiro 
Published: July 2006

Abstract
1. The standard free energy of formation of aquopentamminecobalt(III) chloride in the solid state was calculated by measuring its dissociation pressure.
2. From this value and the standard free energy of formation of aquopentamminecobalt(III) ion, the free energy change of the solution of aquopentamminecobalt(III) chloride was calculated. From this value and the solubility data the activity coefficient of aquopentamminecobalt(III) chloride in the saturated aqueous solution was calculated.
The free energy changes of the solutions of hexamminecobalt(III) chloride, bromide, nitrate and perchlorate as well as of aquopentamminecobalt(III) chloride were found to be a linear function of the logarithms of their solubilities.
3. The thermodynamic stability of hexamminecobalt(III), aquopentamminecobalt(III) and chloropentamminecobalt(III) chlorides in the solid state and in the aqueous solution was discussed.
Vinyl-polymerization with Alkylboron Derivatives
Authors: Ashikari Nobuyuki 
Published: July 2006

Abstract
Such alkylboron derivatives as dialkylboron chloride, dialkylborinic acid, dialkylboronous ester, and dialkylboron oxide as the catalysts for the polymerization of vinyl compounds were studied. Although dialkylborinic acid was a good catalyst, it was pretty difficult to isolate it purely, therefore, only a brief description was made in this paper. Of course, some dialkylborinic acids can be isolated purely under suitable conditions. In regard to this, further investigation will be performed.
The polymerization rates of styrene with these catalysts, the relation between the conversion and the intrinsic viscosity, and the influence of oxygen on the polymerization rate were studied. The polymerization rate of some monomers with dialkylboronous ester is maximum when O2/catalyst in mole ratio is 0.22.
Polymerization of Methyl Methacrylate Initiated by a Combined Action of p-Tolyl Methyl Sulfone, Dimethylaniline and Oxygen in Air
Authors: Uehara Ryoichi 
Published: July 2006

Abstract
The polymerization of methyl methacrylate is initiated by a combined action of p-tolyl methyl sulfone, dimethylaniline, and oxygen. The efficiency of the initiating system is increased by using dimethylanilines substituted with electron-donating groups in the para position. The fact that the 1:1 copolymer of styrene and methyl methacrylate is formed by means of this initiating system suggests the formation of radicals to initiate the polymerization from the initiating system.
Intramolecular Interaction between Hydroxyl Group and π-Electrons. VI. Electronic Effect on the Interaction in ω-Arylalkanols
Authors: Oki Michinori , Iwamura Hiizu 
Published: July 2006

Abstract
The electronic effect on the intramolecular interaction between the hydroxyl group and the π-electrons of the benzene nucleus was studied with various ω-aryl-alkanols. In 2-arylethanols, introduction of an electron-releasing group into the benzene nucleus gives rise to the shift of the νO–H absorption maxima to a lower wave number and to greater integrated intensities of the band due to the interacting form, and introduction of an electron-attracting group to a higher wave number and smaller integrated intensities. However, the wave number of the band due to the interacting form is not affected by the position of the substituent, as far as the substituent is the same. Thus, the structure represented by IX is favored. On the other hand, a compound with an electron-releasing group in the meta position always shows greater integrated intensities of the band due to the interacting form than the para-substituted isomer and this fact saves structure VIII from entire rejection. Hence, the authors tentatively assign structure IX as the most favorable with participation of structure VIII to some extent.
In 3-arylpropanols the interaction is observed only in the compounds with an electron-releasing group and 3-(p-chloro-phenyl)-propanol shows the normal νO–H absorption for primary alcohols. The phenomenon that 3-arylpropanols show smaller interaction in spite of the appearance of the band due to the interacting form at a lower wave number is attributed to the unfavorable change in both energy and entropy.
In 4-arylbutanol no interaction is observed, even though a strongly electron-donating group is introduced.
Thus, as the authors predicted, it has been proved that the intramolecular interaction occurring in 2-phenylethanol is different in nature from that in benzyl alcohol.
Studies on the Interaction of Surface Films with Solute in Solution. IV. Effect of Congo Red Dissolved in Aqueous Substrate upon the Monolayers of Octadecylamine, Cetyl Alcohol, Ethyl n-Hexadecyl Ether, Ethyl Stearate and Cholesterol
Authors: Muramatsu Mitsuo 
Published: July 2006

Abstract
Effect of dissolved Congo red upon the monolayers of octadecylamine, cetyl alcohol, ethyl n-hexadecyl ether, ethyl stearate and cholesterol spread on the substrate containing the dye has been studied, under varying pH of the solution. It has been observed generally that all monolayers expanded when they were spread on aqueous solution, the pH of which was in such a region that the molecules of dye were almost in zwitterion form. Dipolar and van der Waals’ attraction were tentatively postulated to explain the nature of the cohesive force by which the molecules of dye were bond together so that the colloidal aggregates were formed in the solution. The expansion of the monolayer can be accounted for by the binding of the aggregate to film materials. This explanation could successfully be applied to the films of such nonionic substance as cetyl alcohol, ethyl n-hexadecyl ether and ethyl stearate.
The largest expansion of the monolayer of octadecylamine was observed when the substrate containing dye showed acidity so that the molecules of dye were partly of negative charge while those of octadecylamine were of positive charge. In this case we had better take account of the possibility of ion-ion attraction between octadecylamine and dye, in addition to the forces which appeared in the cases of nonionic substances.
Crystallinity Studies of Polychlorotrifluoroethylene by the Infrared Method. II. Kinetics of the Crystallization
Authors: Matsuo Hiroshi 
Published: July 2006

Abstract
The isothermal rate of crystallization in polychlorotrifluoroethylene was measured at temperatures ranging from 172 to 190°C below the melting point by following the change of observed absorbance of crystalline band at 440 cm−1. The isothermal rate of crystallization and apparent induction time are dependent on temperature. The data on the kinetics of the crystallization are compared with the result of Avrami’s analysis. At temperatures between 190 and 185°C the nucleation process will be promoted by heterogeneities which exist in the melt. Between 184 and 178°C it will be mainly governed by homogeneous nucleation.
Ultraviolet Absorption Spectra of Substituted Phenylureas
Authors: Tsuzuki Yojiro , Motoki Shinichi , Migita Kazuko 
Published: July 2006

Abstract
Ultraviolet absorption spectra of several nuclear substituted phenylureas have been measured with the attempt to study the electronic effect of the carbamide group, and the resonance stabilization in three dulcin isomers.
The Preparation and Properties of N-Salicylideneglycinato-aquo-copper(II), Sodium N-Salicylideneglycylglycinato-cuprate(II) and Related Compounds
Authors: Nakahara Akitsugu 
Published: July 2006

Abstract
The two new compounds, N-salicylideneglycinato-aquo-copper(II) and sodium N-salicylideneglycylglycinato - cuprate(II) were prepared and investigated as to their structure.
Their infrared, visible and ultraviolet absorption spectra together with those of some related compounds were measured and discussed.