bluuebunny/crossref_metadata_2025_split huggingface dataset:
Solvent Extractive Fractionation of Ziegler Polystyrene
Authors: Yamada Akira , Yamamuro Yoshio , Yanagita Masaya 
Published: July 2006

Abstract
The solvent extractive fractional ability has been described, using Ziegler polystyrene as sample. The order in hot extraction is tetra-hydrofuran &gt;dioxane &gt;ethyl methyl ketone ≥ ethyl acetate, while that in cold extraction is benzene &gt;&gt; ethyl methyl ketone≥ethyl acetate=toluene.
The Tubular Structure of Collagen Fibril
Authors: Haisa Masao 
Published: July 2006

Abstract
1. The X-ray scattering has been measured for moist and dry collagens of fowl-neck tendon, untreated or treated with formaldehyde or acetic acid. Some modifications of the collagen fibril were also examined by electron microscope.
2. The wide-angle scattering data are compatible with a structure consisting of crystalline and amorphous parts. The intensity distribution of the small-angle diffraction is interpreted by a helical groove structure. The Fourier transform calculated for this model is shown.
3. The electron micrographs show that collagen fibril has a kind of tubular structure with a circular or flat and coiled cross section.
4. The data are discussed with respect to the assumption that collagen fibril is composed of a woven sheet of polypeptide chains in which the crystalline and amorphous parts occur alternatively.
5. A reasonable assignment of hydration to the helical groove is possible; this gives the fibril an approximately uniform electron density in the moist state.
Rapid Microdetermination of Dysprosium in Terbium Oxide by Neutron Activation and γ-Ray Spectrometry
Authors: Okada Minoru 
Published: July 2006

Abstract
Dysprosium in terbium oxide powder was determined by a simple method involving 1 min. irradiation with pile neutrons of 3×1011neutrons per cm2/sec. and repeated γ-ray spectrometry using a 2 in. thick sodium-iodide crystal attached to a 256-channel pulse-height analyzer. Both interferences and the self-shielding effect were negligible. The coefficient of variation of single analyses was 5.2% for a 24 mg. sample of 48 p. p. m. dysprosium content.
Using Iron Ores of Kalabagh. II. Production of Limonite-Acid Method
Authors: Ali M I 
Published: July 2006

Abstract
A method of limonite production has been developed in this laboratory and it was produced from both “Kalabagh iron ores” and “spent limonite” by using local sulfuric acid (60° Bé). Ammonium sulfate, by-product, was also recovered. The process comprised of (i) digestion of the raw materials with 70.0% sulfuric acid, (ii) ammonia treatment of the resultant ferric sulfate solution to produce ferric hydroxide and (iii) careful drying and blending of ferric hydroxide (and oxide) to the desired consistency. The over-all recovery of spent limonite was found to be 80.0%. A material balance sheet is also presented. For the production of 20.0% make-up limonite “siderite” iron ore is suggested to be of use.
Studies on Micro-paraffin. VI. Properties of the Micro-paraffin
Authors: Negoro Kazuo 
Published: July 2006

Abstract
1) The micro-paraffin has longer mean carbon chains than those of ordinary crystalline paraffins, and the content of side-chain hydrocarbons is less than that in ordinary paraffins; its crystals belong to an orthorhombic system, and the formation of fine crystal grains is a result of secondary causes.
2) If the paraffin is recrystallized in ethyl alcohol in the presence of organic compounds of a similar structure which have benzene rings with hydroxyl groups such as Santopour, picric acid, p-hydroxybiphenyl, etc., the crystal growth is inhibited and the crystallized amount of the paraffin crystals is reduced, which is the cause of the formation of fine crystal grains.
3) The alcohol-extracted fraction, isolated from the micro-paraffin materials, has a fairly long alkyl chain and benzene rings with the hydroxyl groups. The crystalline or n-paraffin is micro-crystallized, the same as the above organic compounds, when a very small amount of the fraction is added to it.
4) The content of n-paraffin in the microparaffin is less than that in ordinary crystalline paraffin, but the former contains more sidechain components. The paraffin forms fine crystal grains in the presence of compounds such as the alcohol-extracted fraction.
5) As a result of the purification by the urea method and chromatography, X-ray diffraction, etc., a considerable amount of the crystalline n-paraffins has clearly been found to be contained in micro-paraffin. Therefore, the micro-paraffin does not consist of sidechain paraffin and is not originally micro-crystallized, as has hitherto been believed.
6) The effects of such additive organic compounds on n-dotriacontane, on crystalline paraffins or on a mixture of various hydrocarbons are not the same. In the case of the latter, the tips of the carbon chain in the crystal lattice are arranged in disorder, with a few side-chains; therefore, the crystal growth of the paraffin is believed to be inhibited and then the formation of fine crystal grains occurs.
7) The additive organic compounds wrap up paraffin molecules in the crystallization of paraffin, and the process from the formation of the crystal lattices to the growth of large crystals is so inhibited that the crystal growth is prevented. Crystallization seems to be partially prevented, and micro-crystallization or needle crystallization of small tabular crystals occurs.
Determination of Uranium in Thorium by X-Ray Fluorescent Spectroscopy. The Organometallic Precipitation Method
Authors: Hirokawa Kichinosuke , Gotô Hidehiro 
Published: July 2006

Abstract
A method for the determination of a small amount of uranium in thorium using the separation method with precipitation, combined with X-ray fluorescent spectroscopy, was investigated. About 100 μg. of uranium in thorium could be determined simply and rapidly by using alizarin blue as the precipitant for uranium and EDTA as the masking reagent for thorium.
Spectrophotometric Studies on the Kinetics of Decomposition of Tetramethylmurexide in Acid Medium
Authors: Chaturvedi R K 
Published: July 2006

Abstract
Kinetics of the decomposition of tetramethylmurexide in acid solutions have been investigated spectrophotometrically by following the absorption at λ=530 mμ. The optical density of tetramethylmurexide at this wavelength has been shown to obey Beer’s law with a value of 1.464×104 for the Beer’s constant. The change in the optical density with time of tetramethylmurexide solutions in presence of hydrochloric acid has been shown to obey a first order law and from these data the rate constants of the reaction have been computed at different temperatures in the range 25∼45°C. These data have been employed to obtain quantities such as energy and entropy of activation etc. and the Arrhenius frequency factor; the comparison of this last has been made with the collision theory. The possible mechanism of the reaction has been discussed.
High-kinetic Energy Fragment Ions from Aliphatic Hydrocarbons under Electron Impact. III. Nine Hydrocarbons Ranging from C2 to C4
Authors: Tsuchiya Toshikazu 
Published: July 2006

Abstract
Fragment ions produced by electron impact with excess kinetic energies from into nine hydrocarbons ranging from C2 to C4 have been investigated. Fragment ions of a higher mass number could not be measured. The decomposition mechanism of propylene has been explained by the mechanisms proposed by Hustrulid and by Mohler et al. To explain, the decomposition of other molecules, reactions producing ions with excess kinetic energy as well as neutral fragments must also be taken into consideration.
The Electronic Spectra of Nitrones and the Solvent Effect on Them
Authors: Kubota Tanekazu , Yamakawa Masumi , Mori Yutaka 
Published: July 2006

Abstract
The ultraviolet spectra of nitrones, the configurations of which were assumed from their dipole moments and chemical reactivities, and their related compounds have been measured in various solvents. The following results have been obtained:
(1) Nitrones show a characteristic strong π-π* band in the 280∼370 mμ region as well as one or two additional bands with a relatively low intensity in the 200∼260 mμ region. The molecular extinction coefficient (ε) of the former is about 20000. The decrease in intensity of the π-π* band is observed in the spectra of the sterically-hindered compounds.
(2) These bands always show a blue shifs with the increasing polarity of the solvent. The general rule of solvent effect on heterocyclic N-oxides applies also to nitrones, the conjugated N-oxide band of which has the same property as that of heterocyclic N-oxides.
(3) It has been confirmed by ultraviolet and infrared spectra that the formation of a hydrogen bond such as N→O…H (solvent) plays an important role in this blue shift phenomenon.
The Synthesis and the Physical Properties of Normal Higher Primary Alcohols. V. Thermal and X-Ray Studies of the Polymorphism of Alcohols of Odd Carbon Numbers from Undecanol to Heptatriacontanol
Authors: Watanabe Akira 
Published: July 2006

Abstract
On the phase transition of n-higher alcohols with odd carbon atoms from undecanol (C11) to heptatriacontanol (C37), thermal analyses and X-ray pattern measurements were made, with the following results:
1. Tridecanol (C13) shows an irreversible transition which appers only on cooling. A reversible transition sets in at pentadecanol (C15) and continues to the end member of the series (C37).
2. X-Ray pattern measurements indicated that, in the alcohols up to nonacosanol (C29), the transtition is β to α, while in the alcohols above C29 the transition is γ2 to α.
3. Presumably, the γ2 to α transition is gradual.
4. The properties of the α forms change gradually with an increase in the chain length.
5. The results of the present study and those of previous studies with the even series have been discussed from the configurations of the β and γ1 forms, as determined by X-ray structure analyses.
Bis(succinimidato)copper(II) Complexes with Pyridine, Picolines and Lutidines
Authors: Miki Seiko , Yamada Shoichiro 
Published: July 2006

Abstract
Bis (succinimidato)copper (II) complexes with pyridine and its derivatives have been prepared, the derivatives involving α-, β- and γ-picoline, 2,4-lutidine and 3, 5-lutidine. Depending upon the reaction conditions the following types of complexes have been obtained: (1) red complexes of [Cu(sucim)2(amine)2], (2) violet complexes of [Cu(sucim)2(amine)(OH2)], and (3) indigo or dark-blue complexes of [Cu(sucim)2−(amine)2(OH2)n]. When 2,6-lutidine is employed, however, none of the three types is obtained; rather, a blue compound with the formula of Cu(sucim)2(OH2)2 is isolated.
The configuration of the three types of complexes has been examined, mainly on the basis of the electronic absorption spectra. The complexes of types 1 and 2 consist of quadri-coordinate complexes with a square-planar configuration. The compounds of type 3 consist of quinque- or sexa-co-ordinate complexes.
The configuration of these complexes of the three types in non-donor solvents has also been discussed.
The Electrometric Titration of Thorium with Tellurite
Authors: Sharma V K , Gaur J N 
Published: July 2006

Abstract
Potentiometric and conductometric titrations of thorium nitrate solutions with tellurite show a sharp break at the 1:2 (Th:Te) ratio. Direct volumetric titrations using phenolphthalein as an indictator also show the 1:2 ratio, indicating the formation of normal tellurite. The estimation of thorium by potentiometric, conductometric and direct volumetric titrations using. potassium tellurite has been suggested.
The Acyl-Exchange Reactions of N-Acyl Lactams with Amines. A Novel Synthesis of N-Substituted Amides
Authors: Tani Hisaya , Oguni Nobuki , Araki Takeo 
Published: July 2006

Abstract
N-Acetyl and N-benzoyl lactams consisting of a five-to-seven-membered ring were found to be good acylation reagents. Several amines were acylated with these reagents to give the corresponding amides in good yields.
When N-benzoyl-2-pyrrolidone was used, ring-opened by-products were obtained by the reaction with a secondary amine, such as pyrrolidine and piperidine.
Tosylalanyl-2-pyrrolidone reacted with primary amines to produce the corresponding tosylalanine amides. The alanine methyl ester reacted as a primary amine with tosylalanyl-2-pyrrolidone to afford a dipeptide.
An Application and Modification of the Freeze-out Technique by Quiram and Biller for the Determination of Pollutants in the Atmosphere by Mass Spectrometry
Authors: Hoshino Hiroko , Wasada Nobuhide , Tsuchiya Toshikazu 
Published: July 2006

Abstract
Quiram and Biller’s freeze-out method, originally devised to determine hydrocarbons contained in air above l0 p.p.m. and using a mass spectrometer, was tried on a trace (down to 1/100 p.p.m.) of mercury vapor in atmosphere ; it was proved to give satisfactory results. The freeze-out procedure was then slightly modified. To collect the pollutants, the air sample was circulated automatically for ten minutes through the freezing-out trap instead of repeatedly handling the stopcocks. By this procedure, a blended air sample containing various pollutants above 10 p.p.m. have been analyzed. The precision is about ±10%.
The Vacuum Ultraviolet Absorption Spectra of Aniline and Some of Its N-Derivatives
Authors: Kimura Katsumi , Tsubomura Hiroshi , Nagakura Saburo 
Published: July 2006

Abstract
The vacuum ultraviolet absorption spectra of anilne, N-methylaniline, N-ethylaniline, N,N-dimethylaniline, N,N-diethylaniline and N-n-butylaniline have been measured in the vapor phase by a recording vacuum ultraviolet spectrophotometer, with which the absorption measurements have been extended down to 1500 Å. Some new bands have been found in the vacuum ultraviolet region, and in total five π→π* transtion bands with molar extinction coefficients larger than 1500 have been observed commonly for the anilines. In order to clarify the nature of these bands, a theoretical treatment has been made by considering the configuration interaction among the ground, locally excited and charge-transfer configrations. An excellent agreement has been obtained between the experimental and the calculated result. It has been concluded the the anilines studied here exhibit intramolecular charge-transfer bands characteristic if the electron trasfer interaction between the substituent and benzene ring.
The Szilard-Chalmers Reaction of Several Neutron-Irradiated Inorganic Phosphorus Compounds
Authors: Tanaka Kichizo 
Published: July 2006

Abstract
The distribution of the chemical species containing phosphorus-32 formed by the (n,γ) reaction has been studied for several phosphates as functions of the irradiation conditions in a reactor. The variation in the distribution has been discussed in connection with the radiation annealing process during irradiation, and a comparison of the distribution of the chemical species containing phosphorus-32 by three separation methods has been made.
By means of the analysis of the variation curves of the distribution of the chemical species containing phosphorus-32, the apparent rate constants have been estimated. It has been suggested that the variations in the distribution may be approximately expressed by radiation annealing processes, and that they are affected by pile factors.
Synthesis of Benzocyclobutene by Photochemical Desulfonylation
Authors: Odaira Yoshinobu , Yamaji Kenzo , Tsutsumi Shigeru 
Published: July 2006

Abstract
The synthesis of benzocyclobutene by the photochemical desulfonylation of 1,3-dihydroisothianaphthene-2, 2-dioxide has been studied and the following results obtained; 1) The irradiation considerably accelerates the desulfonylation of the sulfone, while the ultravioletlight has no remarkable effect on the molar ratio of the formed benzocyclobutene and 1,2,5,6-dibenzocycloöctadiene. 2) The rate of desulfonylation is independent of pressure, and the reaction pressure plays a very important role in the further reaction of the intermediate o-xylylene biradical produced by the desulfonylation.
The Complexometric Estimation of Ferric Iron
Authors: Singh Balwant , Mankotia M S , Lamba H S 
Published: July 2006

Abstract
Ferric iron has been determined, alone or in the presence of Ba2+, Ca2+, Sr2+, Cr3+ or Hg2+, by titrating it with CyDTA (disodium salt), using pyrocatechol violet and p-anisidine-thiocyanate as indicators at pH 3.09 and 1.42 respectively. Th4+, F−, C2O42−, Cu2+, Ni2+, Co2+ and Mn2+ have been found to interfere in the complexometric estimation of ferric iron with CyDTA (disodium salt).
Magneto-chemical Studies of Some Organo-Silicon Compounds Containing Si–O Bonds
Authors: Mital R L 
Published: July 2006

Abstract
The diamagnetic susceptibilities of a few organo-silicon compounds have been measured with the help of a very sensitive and accurate microbalance, with an accuracy of the order of 0.5×10−12 c.g.s. e.m.u. The mean value of χsi in these compounds containing Si-O bond is 17.0. The environmental role of Si-O liaisons on the value of χsi has been discussed from the structural point of view.
Stereoselective Synthesis of Nerol
Authors: Yukawa Yasuhide , Hanafusa Terukiyo , Fujita Kaneko 
Published: July 2006

Abstract
Nerol, acyclic monoterpene alcohol, has been stereoselectively synthesized using as an intermediate the unsaturated hydroxylic acid VI, in which the carboxyl and the hydroxymethyl groups are evidently in the cis-relation.
A Semi-empirical MO Theory of σ Electron Systems. II. Bond Polarity and Electronegativity
Authors: Hamano Hidekazu 
Published: July 2006

Abstract
A previously proposed theory is applied to a study of the electronegativity scale and the ionic character of bonds. The general validity of the electronegativity scale and also the relation between the Mulliken and Pauling scales are discussed. The previously defined inductive effect is used as a basis for calculations on MXn-type molecules and on n-alkyl halide molecule. The results are then used for the qualitative interpretation of the experimental dipole moments, nuclear quadrupole coupling constants and fluorine chemical shifts.
A Semi-empirical MO Theory of σ Electron Systems. III. The Bond Additivity Rule
Authors: Hamano Hidekazu 
Published: July 2006

Abstract
The aditivity rules for bond energies and bond moments are discussed on the basis of a previously-proposed theory. The results show that the apparent additivities are partially caused by accidental cancellations when summing over the molecule and essentially by the invariance of the trace of the matrix representing the molecular quantity. Bond energies are then constant in different molecules, whereas bond moments are not, mainly because of the inductive effect.
A High Resolution Nuclear Magnetic Resonance Study of the Styrene-Methylmethacrylate Copolymer
Authors: Kato Yoshinori , Ashikari Nobuyuki , Nishioka Atsuo 
Published: July 2006

Abstract
The information concerning D-units in methyl methacrylate polymer chains has inproved our knowledge about the stereoregularity of the polymer. As an extension of the study, we have examined styrene-methylmethacrylate copolymers prepared under various polymerization conditions. In these cases, the α-methyl resonance of methyl methacrylate does not change, except that the peak position shifts towards a higher magnetic field as the styrene component of the polymer chain increases. A direct evidence of the copolymer structure has been obtained by the analysis of the methoxy resonance. A total of six methoxy resonance lines can be observed if any methyl methacrylate monomer unit in the copolymer chain can be classified only in terms of its placement relative to the neighboring styrene monomer units.
Monomer reactivity ratios have been estimated from the NMR spectra. The results are r1 (styrene)=0.56±0.01 and r2 (MMA) = 0.50±0.03.
Color Reactions of 3-Methyl-2-benzothiazolone Hydrazone with Phenol Derivatives. I. The Spectrophotometric Microdetermination of Catechol, Hydroquinone and Resorcinol
Authors: Kamata Eijiro 
Published: July 2006

Abstract
New spectrophotometric procedures for determining microgram amount of catechol, hydroquinone and resorcinol with MBTH have been described. The sensitivities and selectivites of the reaction are largely dependent on the pH and on the conditions of oxidation: 1) In an ammoniacal medium MBTH gives a stable pink color with catechol and, with hydroquinone, a blue color which is srabilized by acetone. Resorcinol gives only a faint color under these conditions. 2) When ferricyanide is used as a oxidant in a weakly alkaline solution, MBTH gives a sensitive orange color with resorcinol. 3) In an acidic ferric-ferrous redox catechol. At pH 3 the reaction is selective for catechol. 4) Ferric chloride in 1.2n hydrochloric acid is favorable for the determination of hydroquinone and resorcinol in a mixture of the two.
The Reaction of Carbon Monoxide with Organometallic Compounds. IX. The Syntheses of Cyclic Ketones and Polyketones by the Reaction of Carbon Monoxide with Polymethylene Dilithiums
Authors: Ryang Membo , Sawa Yoshihiko , Hasimoto Terukuni , Tsutsumi Shigeru 
Published: July 2006

Abstract
The reactions of carbon monoxide with tetramethylenedilithium, hexamethylenedilithium and pentamethylenedilithium at −70°C have yielded the corresponding poly-ketones (monomer unit: –CO(CH2)n−,n=4,5 and 6) and cyclic ketones (cyclopentanone, cyclohexanone and cycloheptanone). In these reactions, high dilutions of polymethylenedilithiums with a solvent (diethyl ether) lead to the formation of cyclic ketones in good yields. For example, cyclopentanone has been obtained in a 40% theoretical yield.
The Stability Constants of the Palladium, Copper, Nickel, Zinc and Manganese Chelates of 3-Hydroxy-3-phenyl-1-o-tolyltriazene and -1-p-tolyltriazene
Authors: Purohit D N , Sogani N C 
Published: July 2006

Abstract
The stabilities of the palladium, copper, nickel, zinc and manganese chelates of 3-hydroxy-3-phenyl-1-o-tolyltriazene and 3-hydroxy-3-phenyl-1-p-tolyltriazene have been determined in a 70% v/v dioxane-water mixture and at an ionic strength of 0.1m potassium chloride, by employing the Bjerrum-Calvin pH titration technique.
The Reaction of Acetylenecarboxylic Acid with Amines. XII. On the Hydrolysis of the Products Obtained by the Reactions of Diethyl Acetylenedicarboxylate with Amines
Authors: Iwanami Yasuo , Kenjo Yoshihisa , Nishibe Koji , Kajiura Makoto , Isoyama Seiko 
Published: July 2006

Abstract
2-Oxo-3-ethoxycarbonylmethylenepiperazine (IV) and its 6-methyl derivative (V) have been synthesized by the reactions of diethyl acetylenedicarboxylate with ethylenediamine and propylenediamine. These compounds (IV and V), the previously-reported diethyl N-(n-butyl)aminofumarate (VIII), 4-methyl-2-oxo-3-ethoxycarbonylmethylene-3,4,5,6- tetrahydro-2H-1,4-oxazine (X), the newly-synthesized 6-chloro-2-oxo-3-ethoxycarbonylmethylene-3,4-dihydro-2H-1,4-benzoxazine (XII), and 2-oxo-3-ethoxycarbonylmethylene-1,2, 3,4-tetrahydrobenzoquinoxaline (XIV) have been hydrolyzed with 6n hydrochloric acid. The compound XIV has been hydrolyzed, with decarboxylation, to give 2-oxo-3-methyl-1,2-dihydrobenzoquinoxaline, while all the other compounds have been hydrolyzed into pyruvic acid, carbon dioxide, and the amines by the splitting of the carbon-nitrogen bond.
These two types of hydrolyses shown by the compounds have been discussed in connection with their tautomerism between enamine and ketimine forms.