bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hydrogen Peroxide Oxidation. IV. A New Rearrangement Reaction of Phenyl Alkyl Ketones by Selenium Dioxide Catalyst
Authors: Sonoda Noboru , Tsutsumi Shigeru 
Published: July 2006

Abstract
1) Selenium dioxide catalyzed oxidation of phenyl alkyl ketone with hydrogen peroxide in tert-butyl alcohol gave α-phenyl carboxylic acid which was produced by the rearrangement of the phenyl group to the α-carbon atom as shown by Eqs. 2, 4 and 6. Therefore, the reaction mode is quite different from the Willgerodt reaction. The fact described above suggests that similar treatment may be generally applicable to the other aryl alkyl ketones.
2) The reactivity of phenyl alkyl ketone was lower than that of dialkyl ketone, and cleavage reaction was also observed. It is assumed that the cleavage products may be produced partly from the Baeyer-Villiger oxidation product because an active species in this reaction system is considered to be peroxy-selenious acid, a kind of peracid.
Studies on the Mucilage of the Root of “ Tororo-aoi” (Abelmoschus manihot, MEDIC). I. On the Characteristic Colloidal Nature of the Mucilage
Authors: Inokawa Saburo 
Published: July 2006

Abstract
1) The crude mucilage could be filtered after homogenizing by a mixer. By the addition of alcohol-ether mixture to the filtrate, the precipitates were obtained, which gave purified mucilage on redissolving in water.
2) The purified mucilage had noticeable elasticity and could be used for the research work instead of crude mucilage.
3) Some colloidal behavior of the purified mucilage was observed.
Graft Polymerization by Pre-heating Method Applied to Polyethylene Containing Benzoyl Peroxide
Authors: Okamura Seizo , Manabe Tomonobu 
Published: July 2006

Abstract
Some solid polymers containing initiator of radical polymerization of vinyl monomers can initiate graft polymerization by heating in air or in vacuo prior to polymerization. In the experiment on polyethylene film containing benzoyl peroxide (monomer: methyl methacrylate), the increase of time (from 0 to 60 min.) and the rise of temperature (from 20 to 120°C) in pre-heating procedure increase the graft polymerization rate. And also, the increase of time interval after pre-heating until polymerization results in the decrease of the graft polymerization rate.
Variation of Radiocarbon Concentration in Modern Wood
Authors: Kigoshi Kunihiko , Tomikura Yoshio 
Published: July 2006

Abstract
1) Using the tree ring samples, the variation of C-14 concentration in the atmosphere since 1782 has been measured by the use of trees growing in Japan. The results show a constant concentration of C-14 in the atmosphere during 1782 and 1950 within the error of 2%.
2) The depletion of C-14 concentration in the atmospheric carbon dioxide between 1782 and 1950 seems to be less than 2%.
3) The observed annual variations on the samples from Tokyo, Akita and Mie Prefectures show almost the same amount of increase after 1953. There is a good agreement between our data and those on the tree ring samples taken in California by Bien and Suess. The concentration of C-14 in the atmosphere averaged over a year seems to have little difference in the temperate zone of the northern hemisphere.
4) The variation of C-14 concentration in the atmosphere of the southern hemisphere seems to follow that of the northern hemisphere with a time lag of several months.
Studies on Anti-cancer Agents. V. Desulfurization by Hydrazine Hydrate. II. The Reaction of Benzyl and Piperonyl Disulfide with Hydrazine
Authors: Kametani Tetsuji , Fukumoto Keiichiro , Satoh Yumiko , Teshigawara Takashi , Umezawa Osamu 
Published: July 2006

Abstract
The desulfurization reaction which was reported in the previous paper in case of the reaction of p-nitrobenzyl disulfide and hydrazine hydrate was also observed in the similar reaction of benzyl and piperonyl disulfide. The reaction product was found to be benzaldazine derivative instead of the derivative of benzal hydrazine.
On the Thermal Dissociation of Organic Compounds. XV. Thermal Dissociation of Urethans in the Presence of Aromatic Amines
Authors: Mukaiyama Teruaki , Akiba Toyohiko 
Published: July 2006

Abstract
N-Phenyl phenylurethans dissociate readily into their component compounds in the presence of aliphatic amines and the plot for the second order reaction shows a straight line throughout a large portion of the dissociation. However, the rate of the dissociation of urethans in aromatic amines is much slower than in aliphatic ones and shows a tendency of increasing rate as the dissociation proceeds. The anomalous acceleration of the dissociation is due to the reaction products, urea and phenol.
In order to clarify the behavior of urea which accelerates the dissociation effectively, the rates of the dissociation of urethans in the presence of ureas and analogous compounds, such as urethans and amides, were determined.
The mechanism of the dissociation of urethans in aromatic amines which involve the product catalyzed reaction was discussed.
Hot-Atom Chemistry of Halogens in Cobaltammine Complex Salts. I. Hot-Atom Chemistry of Bromine in Bromopentammine Cobalt Complex Salts
Authors: Saito Nobufusa , Sano Hirotoshi , Tominaga Takeshi 
Published: July 2006

Abstract
The hot-atom effect was investigated on 80mBr and 82Br resulting from (n, γ) processes in ligand bromine of bromopentammine cobalt complex salts. The fraction of radiobromine retained in ligand (ligand yield) was compared for samples irradiated in different phases, and it increased in the following order: solution, resin, solid. It is interesting to note that in the irradiation of solids of bromopentammines [Co(NH3)5Br]Br2 showed almost the same ligand yield as other salts. The hot-atoms resulting from the anions may behave in the same way as those from ligands of the complex salts. The exchange of ligand bromine in these complex salts with bromide in water was regarded as being very slow at room temperature.
In the irradiation of the complex ion adsorbed on a cation exchange resin, a considerable fraction of radiobromine was trapped in the resin matrix. Treatments with either inorganic acids or a reducing agent did not remove the activity appreciably. Most of the radiobromine remaining in resin was presumed to be organically combined with the matrix.
Studies on Antibiotics and Related Substances. IX. Synthesis of Methyl 5-Methylenecyclopentanone-2-acetate, an Antitumor Substance and Related Compounds
Authors: Umezawa Sumio , Kinoshita Mitsuhiro 
Published: July 2006

Abstract
1) 5-(Dimethylaminomethyl)cyclopenta-none-2-acetic acid hydrochloride (I) and 2-dimethylaminomethyl isomer (X) have been synthesized from cyclopentanone-2-acetic acid by means of the Mannich reaction.
2) Methyl 5-(dimethylaminomethyl) cyclopentanone-2-acetate (II′) has been degraded to give methyl 5-methylenecyclo-pentanone-2-acetate (III), which has been hydrolyzed into 5-methylenecyclopenta-none-2-acetic acid (IV), a homologue of isosarkomycin.
3) Destructive distillation of the hydro-chloride (I) afforded methyl 5-methyl-4-cyclopenten-l-one-2-acetate(VI), an isomer of III.
4) It has been found that III and IV possess antitumor and antimicrobial activities.
Fluorine-19 Nuclear Magnetic Shielding in Some Monofluorinated Compounds
Authors: Ito Kazuo , Inukai Kan , Isobe Taro 
Published: July 2006

Abstract
The 19F NMR spectra of 2- and 3-fluoropyridines, 1-fluoropyrene, cyclohexylfluoride, 9-fluoroanthracene and 12-fluorochrysene were studied. No signal was obtained for the latter two compounds. The magnetic shielding constants obtained were attempted, together with those for fluorobenzene, 1- and 2-fluoronaphthalenes, to be correlated with some molecular indexes. It was found that the π-electron density in McWeeny’s sense (π-electron “atom charge” density) on the ring carbon atom, to which the fluorine in question is bound, is must probably correlated with the magnetic shielding of the fluorine nucleus. This result suggests that the variation in 19F magnetic shielding constants in these compounds may be attributed mainly to the variation in polarity in C–F σ-bonds. It was noted that such an idea is supported by nuclear quadrupole resonance experiments.
The Effect of Metallic Ions on Surface Chemical Phenomena. III. Solubility of Various Metal Dodecyl Sulfates in Water
Authors: Miyamoto Shigeru 
Published: July 2006

Abstract
Calcium, strontium-, barium-, lead-, manganese-, magnesium-, cobalt- and copper dodecyl sulfates were synthesized and their compositions were determined from the results of their elementary analysis and metal content analysis. Further, the solubility of these metal dodecyl sulfates was measured at various temperatures. From these data, these metal dodecyl sulfates except barium salt were found to have the Krafft points, values of which were shown also.
Relations between Electronic Absorption Spectra and Spatial Configurations of Conjugated Systems. VII. α-Substituted and α, α′-Disubstituted Stilbenes
Authors: Suzuki Hiroshi 
Published: July 2006

Abstract
The ultraviolet absorption spectra of some α- and α, α′-substituted stilbenes have been analyzed, and the most probable spatial configurations of these compounds have been inferred from the spectra by application of the calculation method described in the earlier part of this series. It is especially noteworthy that with α, α′-dimethylstilbene as well as its diethyl analogue the trans isomer shows the conjugation band at a shorter wavelength than the cis isomer, contrary to the generally accepted view that trans isomers of conjugated compounds should exhibit the conjugation bands at a longer wavelength than the corresponding cis isomers. This fact is considered to indicate that with these compounds the trans isomers are less conjugated than the corresponding cis isomers, and that the angle of twist of the “single” bond (interplanar angle) is larger in the trans isomers than in the corresponding cis isomers. This has been confirmed by the results of the calculations. Further, this is supported also by some pieces of information on the properties of these compounds, such as the reactivities, the exaltation of molecular refraction, and the nuclear magnetic resonance. With special emphasis on this respect, the correlation of some physical and chemical properties of these compounds with the spatial configurations of the molecules has been discussed in detail.
Oxidation of Ferrous Ions in the Aqueous Ferrous-Cupric System. I. Effect of Cobalt-60 Gamma-Rays
Authors: Hotta Hiroshi , Terakawa Akira , Ono Shinichi 
Published: July 2006

Abstract
The oxidation of ferrous ion in ferrous-cupric acidic aqueous solution by Co-60 gamma-rays was studied in order to find a good chemical dosimeter for high doses. Consequently, it is found that the non-treated solution containing the 10−3m cupric ion is useful for this purpose, for this amount of cupric ions is sufficient to suppress the effect of oxygen, and that the G-value of the ferrous-cupric system is dependent on the composition of the solution. The suppression can be explained by the scavenging of the HO2− ion by cupric ions. Furthermore, some discussions regarding the system are given in the present paper.
Separation of Uranium and Protactinium from Thorium by Amine Extraction
Authors: Ichikawa Fujio , Uruno Shinobu 
Published: July 2006

Abstract
Uranium, protactinium and thorium are satisfactorily separated from each other by secondary amine extraction. Amberlite LA–1 in kerosene diluent is used as the extractant. Separation from hydrochloric acid solution is superior to that from systems using other acids. The acid dependency of the extraction coefficient by anion exchange resin, but the former has selectivity for uranium. Under the total dose of 5×107r., the radiation damage of Amberlite LA–1 is negligibly small. From these results, it is evident that there is a possibility of applying the amine extraction to the recovery of uranium-233 from reactor blanket fuel.
Investigation on Mixed Complexes. Spectrophotometric Studies on Platinum(II) Complexes
Authors: Kida Shigeo 
Published: July 2006

Abstract
The spectrophotometric investigation has shown that in the substitution reactions of cyanide ion for halogens(X−) of the complexes, [Pt X4]2−, (X=Cl and Br) in solution, no mixed complex is formed.
Alkylalkoxypolysiloxanes. VIII. Lower Members of Cyclic Methyl- and Ethyl-isopropoxypolysiloxanes
Authors: Okawara Rokuro , Katayama Masuo 
Published: July 2006

Abstract
1) Methyl- and ethyl-isopropoxydichlorosilane were hydrolyzed with considerable dropping rate using pyridine as an acid acceptor.
2) Methyl- and ethyl-isopropoxycyclotrisiloxane have been prepared and characterized. Those compounds were found to be stable.
3) Methyl- and ethyl-isopropoxycyclotetrasiloxane have been prepared and characterized.
Resolution of Amino Acids. II. Resolution of Racemic ε-Acyllysine and δ-Acylornithine Amides by Leucine Aminopeptidase
Authors: Izumiya Nobuo , Uchio Hakaru , Kamata Tetsuo 
Published: July 2006

Abstract
ε-Benzoyl-Dl-lysine amide, δ-benzoyl-Dl-ornithine amide and δ-carbobenzoxy-Dl-orithine amide were resolved to ω-acyl-l-amino acids and ω-acyl-d-amino acid amides by the partially purified leucine aminopeptidase preparation. ω-Acyl-l-amino acids and ω-acyl-d-amino acid amides were hydrolyzed to l- and d-amino acid hydrochlorides, respectively. The parts of ω-benzoyl-d-amino acid amides were changed to ω-benzoyl-d-amino acids by acid hydrolysis.
Near Ultraviolet Absorption Spectra of Acrolein and Crotonaldehyde
Authors: Inuzuka K\={o}z\={o} 
Published: July 2006

Abstract
The positions vibrational structures and blueshifts of absorption spectra of acrolein and crotonaldehyde in 33300∼25000 cm−1 region suggest that the transition is of the n-π* type. They are similar in vibrational structure except that the crotonaldehyde absorption is shifted towards higher frequencies with respect to that of acrolein. The vapor frequency of the 0–0 band is 25873 cm−1 for acrolein, smaller by 654 cm−1 than that of crotonaldehyde. The acrolein absorption has 1427, 1271 and 498 cm−1 progressions, which are assigned to the C=C stretching frequency, the C=O stretching frequency and skeletal bending frequency in the excited state, respectively. , For the crotonaldehyde there are 1360, 1237 and 450 cm−1 progressions, which are assigned to the C=C stretching frequency, the C=O stretching and the skeletal bending vibration in the excited state, respectively According to our calculation, the elongation q in the carbonyl bond length during the n-π* transition, is estimated to be approximately 0.1 Å.
Monolayers of Some Cyclic Peptides. Fungisporin and Gramicidin J1
Authors: Ikeda Shoichi , Isemura Toshizo 
Published: July 2006

Abstract
Monolayers of two naturally occurring cyclic peptides, fungisporin and gramicidin J1, were investigated by the measurements of surface pressure, potential, and viscosity. Fungisporin, an octapeptide composed of phenylalanyl and valyl residues, gave a monolayer of a condensed type. Gramicidin J1, an electrolytic heptapeptide containing a prolyl and two ornithyl residues, gave an unionized monolayer of an expanded type on an alkaline subphase. It behaved in a somewhat specific manner when neutral salt such as potassium chloride was present.
The configurations of these cyclic peptides in monolayer were suggested in such a way as intramolecular hydrogen bonding could cause a maximum number of seven-membered rings. Then fungisporin can take four possible square-like configurations, which are equally probable, and gramicidin J1 can take two possible configurations. When these configurations of both peptides are put on surfaces, side chains of all the d-residues always orientate oppositely to those of all the l-residues with respect to the surfaces.
In taking account of the condensation and expansion of these monolayers, together with those of tyrocidine A and B and gramicidin SA, it was concluded that cyclic peptides give more condensed monolayers as the contents of prolyl residue are higher. Thus a prolyl residue plays the same role in cyclic peptides as in linear polypeptides.
Gramicidin J1 gave a monolayer of more expanded type on a neutral subphase, and exhibited a characteristic behavior common with ionized monolayers when neutral salt such as potassium chloride was added. At very large areas the the behavior was adequately explained by the theory of the electric double layer, when only one ionized residue was assumed to concern the double layer.
Systematic Separation of Fission Products by Solvent Extraction Method
Authors: Kiba Toshiyasu , Ohashi Shigeru , Maeda Toyoo 
Published: July 2006

Abstract
A new scheme for separating fission products, zirconium-niobium-95, cerium-144, promethium-147, yttrium-90, strontium-90, ruthenium-106 and cesium-137, by the four-step liquid-liquid extractions was presented. First, zirconium-95 and niobium-95 were extracted from a 5 m hydrochloric acid solution into chloroform with cupferron. Second, rare-earth nuclides, cerium-144, promethium-147 and yttrium-90 were extracted from an acetate buffered solution of pH 4 to 5 into chloroform with cupferron. Third, strontium-90 was extracted from an acetate buffered solution of pH 8 into hexone (methyl isobutyl ketone) with TTA (2-thenoyltrifluoroacetone). Fourth, ruthenium-106 was extracted from 5 m hydrochloric acid solution with TBP (tri-n-butyl phosphate)-kerosene in the presence of stannous chloride or extracted with TBP in the presence of hydroxylamine. then cesium-137 was left in the last aqueous solution. Strippings of nuclides extracted in the organic phases could be attained by shaking each organic phase with nitric acid.
Ultraviolet Absorption Spectra of Aqueous Solutions and Single Crystals of Thioacetamide and Thiourea
Authors: Hosoya Haruo , Tanaka Jiro , Nagakura Saburo 
Published: July 2006

Abstract
Ultraviolet absorption spectra of thioacetamide and thiourea are measured under various conditions. In aqueous solution, three bands (210, 261 and 318 mμ) for thioacetamide and two bands (195 and 236 mμ) for thiourea are observed. Further, polarized ultraviolet absorption spectra are measured with their crystals. On the basis of the results regarding the polarized ultraviolet absorption spectra, the directions of transition moments can be determined as follows : 1) the directions of transition moments of the 261 and 210 mμ bands of thioacetamide are approximately parallel to the axis connecting the nitrogen and sulfur atoms and connecting the nitrogen and methyl carbon atoms, respectively, 2) the directions of transition moments of the 236 and 195 mμ bands of thiourea are parallel and perpendicular to the C=S axis, respectively. From the combination of the experimental results concerning the directions of transition moments with theoretical consideration based on semi-empirical LCAO treatment including configuration interaction, the assignment of the four absorption bands under consideration are finally determined. One of the noticeable conclusions is that the 195 mμ band of thiourea can be regarded as a typical intramolecular charge-transfer absorption.
It is shown that in the hydrochloric acid solution of thioacetamide the 261 mμ band decreases its intensity and a new band appears at 237 mμ. By measuring the dependence of intensities of these two bands upon the acid strength of the solution, it is concluded that the 237 mμ band is due to the conjugate acid of thioacetamide. The pKB value of thioacetamide is determined spectrophotometrically to be 1.2 at 24.5°C. From the comparison of the wavelength of the peak absorption of thioacetamide with that of its conjugate acid, it is seen that the proton is conceivably attached to the amino group.
On the Mechanism of the Extraction of Uranyl Nitrate by Tributyl Phosphate II. Infrared Study
Authors: Nukada Kenkichi , Naito Keiji , Maeda Utako 
Published: July 2006

Abstract
The complex formation of TBP in the systems-TBP-water, TBP-nitric acid, and TBP-uranyl nitrate was confirmed by means of infrared spectroscopy. The infrared spectra of uranyl nitrate in the system TBP-nitric acid-uranyl nitrate lead to the conclusion that the competition extraction of both uranyl nitrate and nitric acid takes place during the extraction process.
Effect of Temperature on the Viscosity and the Optical Rotation of Poly-ε-aminocaproyl-α-alanine
Authors: Ebata Mituo 
Published: July 2006

Abstract
Viscosity and optical rotation of a synthetic polymer, poly-ε-aminocaproyl-α-alanine, were studied connecting with the reversible heat coagulation. A minimum viscosity of the poly-ε-aminocaproyl-D,L-alanine solution was found at 55°C. Heating of the poly-ε-amino-caproyl-l-alanine solution produces an increase in its levo-rotation and a shift of its dispersion constant (λc value) to shorter wavelength. The mechanism of the reversible heat coagulation of the polymer was discussed to be based on the obtained result.
Quantitative Spectrochemical Analysis of Minor Elements in Silicates with Double Internal Standards
Authors: Hamaguchi Hiroshi , Kuroda Rokuro , Negishi Ryokichi 
Published: July 2006

Abstract
Two internal standards have been used in the spectrographic analysis of silicates, antimony(III) oxide for volatile elements and palladium black for the involatile group. The former was used as the standard for the determination of gallium, lead and tin, and the latter for the determination of nickel, cobalt, chromium, vanadium and scandium. A medium spectrograph is not suitable for the determination of chromium or tin, and scandium did not volatilize in a manner parallel to the palladium but it was possible to obtain reasonable results for the other elements.
Absorption Spectra of Dyes. VI. Steric Effects in Conjugated Systems of Benzidine Disazo Dyes and their Copper Derivatives
Authors: Kobayashi Teruaki , Tanizaki Yoshié , Ando Noboru 
Published: July 2006

Abstract
1. Absorption spectra of benzidine disazo dyes and their copper derivatives in aqueous solution were measured at room temperature, and they are compared with one another.
2. It was shown by a simple calculation that the dyes, each of which has sulfonic groups adjacent to the azo groups, have strained conformations caused by the repulsion between the sulfonic groups and the unshared electrons of nitrogen. It was also shown that the relationship between the relative positions of sulfonic groups to the azo groups and the relative absorption intensities could well be explained.
3. The absorption intensities of the copper derivatives were nearly equal, having no relation to the positions of the sulfonic groups, and in addition they were near to those of the non-copper dyes which have the sulfonic groups adjacent to the azo groups. Hence, it was pointed out that the introduction of copper caused the same extent of strain in conjugated systems as sulfonic groups did.
Paramagnetic Resonance of Radicals of Some Aromatic Vinyl Compounds. I
Authors: Morigagi Kazuo , Kuwata Keiji , Hirota Kozo 
Published: July 2006

Abstract
Paramagnetic resonance of radicals of the aromatic vinyl compounds in the tetrahydrofuran and dioxane solutions was observed: styrene, α-methyl styrene and p-methyl styrene. By analyzing the observed spectra the structure of the radicals is discussed. From these results it may be concluded that the reaction of the aromtic vinyl compounds with alkali metal proceeds through two steps ; formation of their radical anions, and successive addition of the monomers to this radical anion turning into “living polymers”.
Paramagnetic Resonance of Radicals of Some Aromatic Vinyl Compounds. II
Authors: Morigaki Kazuo , Kuwata Keiji , Hirota Kozo 
Published: July 2006

Abstract
Paramagnetic resonance absorption of the radicals of 1,1-diphenylethylene, stilbene and 1,4-diphenylbutadiene in tetrahydrofuran solution was investigated at room temperature. In diphenylethylene (DPF) radicals two kinds of spectra were observed corresponding to two states of the radicals; one is the DPE monomer anion and the other DPE polymer anion. In connection with the experimental results in the case of styrene, α-methylstyrene and p-methylstyrene described in the preceding paper, the process of polymerization of some aromatic vinyl compounds was discussed.