bluuebunny/crossref_metadata_2025_split huggingface dataset:
Composition of Single Crystal of Iron Sulfide Grown by Normal Freezing
Authors: Ametani Kohei , Takahashi Tatsuo 
Published: July 2006

Abstract
The composition of a single crystal of iron sulfide was determined as a function of position along the growth axis using atomic absorption spectrophotometry. The observed composition was consistent with the phase diagram for the iron-iron sulfide pseudo binary system and the results of physical measurements.
The Syntheses of Several Pyrimido[4,5-e][1,2,4]triazines
Authors: Sugimoto Takashi , Matsuura Sadao 
Published: July 2006

Abstract
A new synthetic method for some derivatives of pyrimido[4,5-e][1,2,4]triazine, using 5-nitrosopyrimidines as the starting materials, was studied. That is, the condensation of 5-nitrosopyrimidin-2,4,6-trione and its methyl derivative with amino- or alkylamino-guanidine gave several 3-aminopyrimidotriazin-6,8-diones.
Cationic Arylation. VIII. Reactions of Benzenediazonium Tetrafluoroborate with Some Sulfur Compounds
Authors: Kobayashi Michio , Minato Hiroshi , Fukui Junko , Kamigata Nobumasa 
Published: July 2006

Abstract
Reactions of benzenediazonium tetrafluoroborate (I) with thioanisole in acetonitrile yielded dimethylphenylsulfonium tetrafluoroborate, diphenyl sulfide, methylthiobiphenyls and acetanilide. Reaction of I with cyclohexene yielded 1-cyclohexylcyclohexene and cyclo-hexyl phenyl ether. Reactions of I with dimethyl sulfide yielded trimethylsulfonium tetrafluoroborate and thioanisole. Mechanisms of these reactions were discussed in terms of the attack of phenyl cation toward the lone electron pair of sulfur atoms and the benzene electrons.
Reaction of Benzylic Chlorides with Hexamethylphosphoric Triamide
Authors: Arimatsu Seiji , Yamagughi Ryohei , Kawanisi Mituyosi 
Published: July 2006

Abstract
Benzyl chloride was converted into benzyldimethylamine (1), dibenzylmethylamine (2), and benzylpentamethylphosphoric triamide (3), when it was heated in hexamethylphosphoric triamide (HMPT). Diphenylmethane (4), benzhydrylmethylamine (5), and benzophenone methylamine (6) were obtained when benzhydryl chloride was used in place of benzyl chloride. Triphenylmethyl chloride afforded triphenylmethane (7) as the sole isolable product.
Reactions of 1-Azaazulan-2-one and Its 3-Substituted Derivatives
Authors: Toda Takashi , Ryu Shoji , Hagiwara Yohichi , Nozoe Tetsuo 
Published: July 2006

Abstract
Chemical properties of l-azaazulan-2-one (I) and its 3-substituted derivatives such as 3-acetyl, 3-cycloheptatrienyl and 3-ethoxycarbonyl were investigated. It was shown that the electrophilic substitution reactions take place at the 3-position, replacement of the substituents occuring in some cases by the reactions with cationoid reagents. The Beckmann rearrangement, Curtius rearrangement, Hofmann degradation reaction, Stevens-McFadyen reaction, etc. of these compounds are described.
Analysis of Metals by Solid-Liquid Separation after Liquid-Liquid Extraction. Spectrophotometric Determination of Some Metals by Extraction of Metal Complexes with Molten Naphthalene
Authors: Fujinaga Taitiro , Satake Masatada , Yonekubo Tatsuo 
Published: July 2006

Abstract
A procedure is described for the spectrophotometric determination of metals after extraction with molten naphthalene. Some metal ions react in aqueous solution with complex-forming reagents such as oxine, 2-methyl-oxine, dimethylglyoxime or α-benzil dioxime to form water-insoluble complexes in certain pH ranges, the complexes being easily extracted into molten naphthalene. The extracted mixture of metal complex and naphthalene is dissolved in dimethylformamide and the amount of each metal is determined spectrophotometrically. The working range of metal ion concentration and effect of various factors such as pH, amount of reagent and naphthalene were studied, and the molar absorptivity, sensitivity and relative standard deviation evaluated.
Chlorination of Methylcyclohexane in Molten Salt Media
Authors: Kikkawa Sh\={o}ichi , Hayashi Takatoshi , Nomura Masakatsu , Otsu Noboru 
Published: July 2006

Abstract
The chlorination of methylcyclohexane in several molten metal chloride mixtures (ZnCl2/KCl/NaCl, CuCl/ KCl/NaCl, AlCl3/KCl/NaCl, and CuCl2/KCl/NaCl) has been carried out, using nitrogen gas as a diluent, at three levels of temperature (250, 350, and 450°C. The reactions in both ZnCl2 and CuCl melts were studied extensively, the former representing the molecular-type melt and the latter standing for the partially-ionic-type one. These reactions gave 1-, 2-, 3-, and 4-chloro-methylcyclohexanes and 1-, 3-, and 4-methylcyclohexenes as primary products, along with smaller amounts of toluene and methylcyclohexadiene. The formation of these olefins were interpreted by the subsequent elimination (by a carbonium-ion mechanism) of HCl catalytically enhanced by these melts from the methyl-chlorocyclohexane derivatives. The difference observed in the product distributions between ZnCl2 and CuCl melts was also explained by the studies of the effect of hydrogen chloride produced in these reactions over molten salts.
Pressure Effect on the Isomerization Velocities of β-[Co(edda)(tn)]+ and β-[Co(edda)(en)]+ in Solution
Authors: Kitamura Yoichi 
Published: July 2006

Abstract
The rates of the isomerization of β-[Co(edda)(tn)]+ and β-[Co(edda)(en)]+ to the α-isomers in a 0.2 M Na2CO3–0.2 M NaHCO3 buffer solution have been measured under pressures of 1, 1000, 2000, and 3000 kg cm−2. The activation volumes have been found to be 14.7 and 20.0 ml mol−1 respectively. It may be concluded that these reactions proceed through the SNl CB mechanism.
Circular Dichroism of trans-Dichlorocobalt(III) Complexes with Chiral 1,2-Diamines
Authors: Yano Shigenobu , Saburi Masahiko , Yoshikawa Sadao , Fujita Junnosuke 
Published: July 2006

Abstract
The circular dichroism (CD) spectra of trans-dichlorobis(diamine)cobalt(III) complexes were measured in methanol solution in the 700–200 nm region, where the diamines have the general formula of NH2CH(R)CH2NH2(R=isopropyl, isobutyl, sec-butyl, benzyl and phenyl) and belong to the S configuration except the phenyl-substituted one. The spectra are essentially the same as thq spectrum of the (S)-propylenediamine ((S)-pn; R= methyl) complex, except for the (R)-C-phenylethylenediamine ((R)-phenen) complex. The variation of the C-substituted alkyl groups has hardly any influence on the CD of the trans-[CoCl2(diamine)2]+ type complexes, demonstrating that the vicinal contribution from the C-substituents can be disregarded in these compounds. The trans-[CoCl2((R)-phenen)2]+ ion shows a CD pattern differing significantly from that of the trans-[CoCl2((R)-pn)2]+ ion in the first absorption band region, suggesting the significance of the vicinal effect due to the C-substituted phenyl group. The CD curve of trans-[CoCl2((−)D-stien)2]+ ion (stien=stilbenediamine) was found to be antimeric to that of the (R)-phenen complex. Taking into account the anomalous vicinal effect of the phenyl groups, the absolute configuration of the (−)D-stien was assigned to the (S,S) configuration.
Preparation of Phorone
Authors: Nakada Yasuo , Yura Yasuo , Murayama Keisuke 
Published: July 2006

Abstract
A new method for preparation of 2,6-dimethylhepta-2,5-dien-4-one (4; phorone) from isobutene and carbon tetrachloride is described. A redox addition of carbon tetrachloride to isobutene in the presence of ferric chloride, benzoin, and diethylamine hydrochloride yielded 3-methyl-1,1,1,3-tetrachlorobutane (1). 2,6-Dimethyl-2,4,4,6-tetrachloroheptane (2) was obtained by the addition of 1 to isobutene or the twofold addition of carbon tetrachloride to isobutene. Treating 2 with ethanolic potassium hydroxide gave 2,6-dimethylhepta-1,5-dien-3-yne (3). Hydration of 3 by treating with methanolic boron trifluoride in the presence of mercuric oxide and with aqueous sulfuric acid gave 4.
The Effects of Phosphorus Ligands on the Stereoselectivity of the Nickel-catalyzed Dimerization of Norbornadiene
Authors: Yoshikawa Susumu , Kiji Jitsuo , Furukawa Junji 
Published: July 2006

Abstract
The effects of phosphorus ligands on the stereoselectivity of the nickel-catalyzed 2+2 cyclodimerization of norbornadiene have been studied. The electronic factor, νCO(A1), of Ni(CO)3L (where L is the ligand) is correlated with the ratio of the exo-trans-exo (X-t-X) to the exo-trans-endo (X-t-N) isomers of the product, but no simple correlation is apparent between the steric parameter and the selectivity. A three-coordinated Ni(0) species is proposed as the intermediate. The values of ΔHX-t-X\eweq−ΔHX-t-N\eweq and ΔSX-t-X\eweq−ΔSX-t-N\eweq are large and negative.
Compounds Related to Acridine. XIII. Reactions of 9-Vinyl- and 9-Ethynylacridine with C,N-Diarylnitrones
Authors: Tsuge Otohiko , Torii Akiyoshi 
Published: July 2006

Abstract
The reaction of 9-vinylacridine (1) with C,N-diarylnitrones (3) in xylene under reflux afforded 5-(9-acridinyl)-2,3-diarylisoxazolidines (4) and/or 9-acridinyl styryl ketones (5). On heating isoxazolidines 4 were readily converted into the styryl ketones 5 with the elimination of anilines: this is a new type of thermal decomposition of isoxazolidine ring. However, thermal decomposition of 3-(9-acridinyl)-2,5-diarylisoxazolidines (9) which were prepared from N-(9-acridinylmethylene)aniline N-oxide (7) and styrene (8), did not observed. On the other hand, the reaction of 9-ethynylacridine (2) with nitrones 3 in ethanol under the influence of hydrochloric acid proceeded smoothly to give the reversed 4-(9-acridinyl)-4-isoxazolines (11), which on heating were converted into the corresponding 4-oxazolines 12.
The Crystal Structure of the Trinuclear Complex, [Cu3{(C2H5)2N(CH2)2NH(CH2)3O}2(OH)2](ClO4)2
Authors: Matsumoto Naohide , Nishida Yuzo , Kida Sigeo , Ueda Ikuhiko 
Published: July 2006

Abstract
The structure of the trinuclear complex, formed from N,N-diethyl-N′-(3-hydroxypropyl)ethylenediamine and copper(II) perchlorate, has been determined from three dimensional X-ray diffraction data. The crystals are monoclinic with the space group P21/c. The cell dimensions are a=7.759(6), b=13.21(1), c=15.00(1) Å and β=103.95(6)°. The unit cell contains two molecules and the molecule has a centre of symmetry. The structure has been determined by the heavy atom method and refined by the block diagonal least squares method to give R=6.83% for 1368 observed reflections. Three copper atoms are arrayed on a straight line, the separations being 2.902 Å. The geometry around the two end copper atoms is best described as a slightly distorted tetragonal pyramid. The central copper atom has a square planar environment.
Study of Cholesteryl Formate and Cholesteryl Octanoate by Means of Thermal Analytic Microscopy with a Thermoelement
Authors: Sasaki Kunihisa Kazuko , Hagiwara Seiichi 
Published: July 2006

Abstract
A simple apparatus using a thermoelement was constructed for thermal analytic microscopy and the phase transitions of cholesteryl formate and cholesteryl octanoate were studied. The isotropic-cholesteric transition of cholesteryl formate and the cholesteric-smectic transition of cholesteryl octanoate were observed microscopically but not thermally. Upon slow cooling cholesteryl octanoate gives large spherulites with a cholesteric focal conic texture. The spherulites are optically negative. They give rise to the vortices which turn to smectic reeled yarns in specimens with appropriate thickness. The solar spectrum which appears at the cholesteric-smectic transition of cholesteryl octanoate was observed repeatedly, namely, blue, yellow, red, blue, etc. A melt recrystallized sample of cholesteryl formate forms a block similar to a sphere in the thermal cell. Both solid phases of cholesteryl formate and octanoate grow radially in the microscopic cell plates.
Physico-Chemical Properties of Aqueous Solutions of Cn−1H2n−1OCH2COONa
Authors: Hato Masakatsu , Shinoda K\={o}z\={o} , Miyagawa T\={o}ru 
Published: July 2006

Abstract
Properties of aqueous solutions of surfactants, Cn−1H2n−1OCH2COONa (n−1=12–18), which may be nontoxic, non-allergic and bio-degradable, have been studied. The Krafft points in aqueous solutions of these surfactants are close (+8.5–−1.5 °C) to those of the corresponding fatty acid soaps RnCOONa. The critical micelle concentrations are also close to those of corresponding fatty acid soaps in spite of the introduction of an oxygen atom in the hydrocarbon chain. A study of the effect of water hardness on the solubility revealed that this type of surfactant is, unlike soap, soluble in town water (hardness 4°) in the presence of equal weight of tripolyphosphate.
The Microwave Spectra of Sulfur Tetrafluoride in the Excited Vibrational States. The Vibrational Assignment for ν4 and ν9
Authors: Inoue Hiroshi , Naruse Akio , Hirota Eizi 
Published: July 2006

Abstract
The vibrational satellites of SF4 have been observed for the two lowest bending modes, ν4 and ν9. The relative intensities which were observed are consistent with the vibrational assignment of Frey et al. but are incompatible with Levin’s assignment. Consideration of the Coriolis interaction between the two modes lead to the same conclusion. The centrifugal distortion constants are evaluated and are compared with the observed.
Trifluoroacetylation at the 3 Position of 1-(2-Aminophenyl)-2,5-dimethylpyrrole in Trifluoroacetic Acid. Possible Remote Control of an Amino Group in Electrophilic Substitution
Authors: Imuro Kimie , Hanafusa Terukiyo 
Published: July 2006

Abstract
Spontaneous trifluoroacetylation at the β position of the pyrrole ring in 1-(2-aminophenyl)-2,5-dimethylpyrrole (1) was observed in trifluoroacetic acid. The half-life of the reaction was about 3.5 h at 25 °C. This unexpected result might be explained in terms of the 1,5-participation of the amino group in the electrophilic substitution reaction.
An Observation of Compensation Effects between Enthalpy and Entropy Changes in the Interaction of Nickel-2,2′-bipyridine Complexes with Olefins
Authors: Yamamoto Akio , Yamamoto Takakazu 
Published: July 2006

Abstract
Compensation effects in the thermodynamic parameters ΔH° and ΔS° in the coordination of olefins with Ni(bpy) and NiR2(bpy) (bpy=2,2′-bipyridine) and in the kinetic parameters ΔH\eweq and ΔS\eweq in reactions of NiR2(bpy) with olefins have been observed; factors governing these compensation effects are discussed.
Effect of Hydroxylation on the Thermal Reactivities of Fluorapatite and Chlorapatite
Authors: Monma Hideki , Kanazawa Takafumi 
Published: July 2006

Abstract
Thermal self-decomposition of hydroxyapatite was notably suppressed by partial fluorination or chlorination. The volatility of halogen from fluorapatite and chlorapatite was reduced by the incorporation of hydroxide ions in the apatites. The reactivities of fluor-hydroxyapatite and chlor-hydroxyapatite with silica increased with increasing hydroxide content, which resulted in an increase in the halogen volatility.
The Reaction of the Butenyl Grignard Reagent with Trimethylchlorosilane
Authors: Sakurai Hideki , Kudo Yoshihiko , Miyoshi Heiichi 
Published: July 2006

Abstract
The reaction of trimethylchlorosilane with the butenyl Grignard reagent prepared from either 3-chloro-1-butene or 1-chloro-2-butene yielded trans-2-butenyltrimethylsilane, cis-2-butenyltrimethylsilane and 1-methyl-2-propenyltrimethylsilane, approximately in the ratio of 30/20/50. Structures of these isomeric butenylsilanes were elucidated by NMR and IR spectra.
The Preparation, Infrared Spectra, and Thermal Stability in the Solid State of Nickel(II) Complexes with edda-type Polyamino Carboxylic Acids
Authors: Hirako Ichiro , Murakami Tasuku , Hatano Masahiro 
Published: July 2006

Abstract
Some nickel(II) complexes with optically active ethylenediamine-N,N′-diacetic acid(edda)-type polyamino carboxylic acids were prepared. Their electronic and infrared spectra and thermogravimetric curves were measured in the solid state. The stretching frequencies of the coordinated carboxylate group and the thermal stability of these complexes in the solid state were quite different from those of bis(amino acidato) complexes.
The X-Ray Structure of the (+)589-cis(O)trans(Nα)cis(Nδ)-Bis(l-ornithinato)cobalt(III) Complex
Authors: Nakayama Yasuji , Ooi Shun’ichiro , Kuroya Hisao 
Published: July 2006

Abstract
(+)589-Bis(l-ornithinato)cobalt(III) nitrate monohydrate was isolated by ion-exchange chromatography from a reaction mixture of trinitratotriamminecobalt(III) with l-ornithine at pH 9, and was assigned to the cis-(O)trans(Nα)cis(Nδ) isomer on the basis of the absorption and circular dichroism spectra. Then, the geometry of the complex was confirmed by X-ray structure analysis. The red crystal is orthorhombic, with these cell dimensions: a=14.380, b=16.493, and c=6.787 Å. The space group is P212121, and Z=4. The crystal structure was solved by the Patterson and Fourier techniques and was refined by the least-squares method to R 0.099. The Co atom is surrounded by 2 O and 4 N atoms, the former being in cis positions. Each of the l-ornithinato ligands assumes the facial coordination, and the complex cation has an approximate two-fold axis by which the ligand are correlated.
The Crystal Structure of α-K8SiW11O39·13H2O
Authors: Matsumoto Kazuko Y , Sasaki Yukiyoshi 
Published: July 2006

Abstract
α-K8SiW11O39·13H2O is cubic with the space group P\bar43m and a=10.654(1) Å; Dm=4.40 g cm−3, Dx=4.42 g cm−3 for Z=1. The crystal contains a discrete SiW11O398− ion, which is almost identical to α-SiW12O404− anion in shape and in size but one tungsten atom and the exterior terminal oxygen atom are absent. The position of the vacant hole could not be located because of the seemingly high symmetry of Td of the polyanion caused by the orientational randomness of the anions. The silicon atom at the center of the polyanion lies on the origin of the cubic lattice and the potassium cations linking α-SiW11O398− ions are at the middle points of adjacent polyanions.
Color and Structural Changes of Bis(hexamethylenetetramine)cobalt(II) and nickel(II) Complexes in the Course of Thermal Dehydration in Solid State
Authors: Nagase Kenzo , Yokobayashi Hiroko , Sone Kozo 
Published: July 2006

Abstract
The stoichiometry of thermal dehydration of MX2(hmta)2·nH2O (hmta=hexamethylenetetramine; X= Cl−, Br−, I−, NO3−, NCS−; n=4–10) was established by the TG-DTA methods. The nature of the structural changes caused by complete or partial dehydration was studied on the basis of the accompanying changes in the electronic and vibrational spectra. Anions and hmta in general get into the coordination sphere with a decrease in the number of the coordinated water, but the bulky and weakly basic amine often gets coordinated in the last stage.
Study of the Synthesis of Histidine Peptides. II. Use of Nim-Tosylhistidine Derivatives in Conventional Solution Synthesis of Peptides
Authors: Fujii Toshiyuki , Kimura Terutoshi , Sakakibara Shumpei 
Published: July 2006

Abstract
His–Gly and Ala–His–Gly were synthesized by the conventional solution methods using various Nα-protected-Nim-tosyl-l-histidines as the key intermediates, and handling conditions of these His(Tos)-derivatives were examined. During treatment of an Nps-peptide with HF, the formation of a strongly photosensitive by-product was observed when anisole alone was used as the scavenger, however the side reaction was completely suppressed when skatole was added to the reaction mixture. In order to evaluate the usefulness of these His(Tos)-derivatives in general peptide synthesis, TRH and LH–RH were synthesized, and both products were obtained in pure form without any difficulty. Thus, it can be emphasized that the use of these His(Tos)-derivatives is efficient and convenient for introducing His-residues into peptides even in solution procedures.
Stereochemistry of the C and D Rings of C-Nor-D-homosteroids. IV. The Relative Stabilities and NMR Spectra of 17-Substituted C/D trans- and cis-Fused Etiojervanes
Authors: Masamune Tadashi , Murai Akio , Nishizakura Kouichi , Orito Takako , Numata Satoshi , Sasamori Hiroshi 
Published: July 2006

Abstract
(1) The relative stabilities between 17-substituted C/D trans- and cis-fused 11-oxoetiojervanes were investigated by treatment of both or either one of these 12-epimeric compounds under equilibrating conditions. The equilibrium ratios thus obtained were estimated qualitatively in terms of the configuration and bulkiness of substituent(s) at C17. (2) The chemical shifts of 19- and 18-methyl protons in a number of etiojervanes were examined collectively. The “principle of additivity” holds satisfactorily for the 19-methyl protons of all etiojervanes, with two exceptional cases, irrespective of the configuration at C12 and also for the 18-methyl protons of 12β-etiojervanes. However, the principle is not applicable for the latter protons of 12α-etiojervanes, suggesting that the D ring would take different conformations depending on the 17-substituents.
Foamy Complex Formation for Removing and Recovering of Heavy Metal Ions in Dilute Solutions with N-Monodecanoyl Diethylenetriamine
Authors: Izumi Gaku , Sato Makoto , Shoji Sakae , Oikawa Kanenao 
Published: July 2006

Abstract
In order to highly selectively remove and recover heavy metals, usually harmful, from wastewater, a modified foam-separating method using a fatty compound, i.e. N-monodecanoyl diethylenetriamine, was investigated on real and model wastewater, containing several kinds of metals. This agent forms soluble and foamy complexes with the metals.
3C-NMR Study of Aerosol OT in Chloroform
Authors: Ueno Masaharu , Kishimoto Hiroshi , Kyogoku Yoshimasa 
Published: July 2006

Abstract
The dynamic structure of Aerosol OT molecules in micellar state was studied by measurements of 13C-NMR spin-lattice relaxation time (T1) and the effect of a lantanide shift reagent Yb(fod)3 in chloroform at 25 MHz and 40°C. The results were analyzed on the basis of the conformation and segmental motions of Aerosol OT molecules in micellar state, with the following conclusions: Aerosol OT molecules in the micellar state associate with each other by the polar head groups; their hydrocarbon chains are flexible; the mobility of side chain is restricted to a greater extent than that of the main chain; carbonyl carbon-(2′) is located nearer to the polar group than carbon-(2) in steric conformation.
Nature of Catalytically Active Sites over Solid Acids. I. Selective Poisoning of Lewis Acid Sites on Silica–Alumina with Pyridine and Its Application to Olefin Polymerization
Authors: Mizuno Koichi , Ikeda Masanori , Imokawa Toshiaki , Take Jun-ichiro , Yoneda Yukio 
Published: July 2006

Abstract
When pyridine chemisorbed on silica–alumina was evacuated at 350°C, the 1460 cm−1 band due to Lewis-bound pyridine (LPY) remained while the 1540 cm−1 band due to Brønsted-bound pyridine (BPY) completely disappeared. This disappearance of the BPY band was revealed to accompany a loss of the Brønsted acid sites themselves besides their liberation. However, the lost Brønsted acid sites were regenerated by allowing the sample to stand overnight at 110°C. Thus, strong Lewis acid sites of silica–alumina were able to be selectively poisoned by pyridine without any damage to the Brønsted acid sites. By poisoning catalysts in situ by controlled amounts in this way, the nature of the active site was investigated for polymerization of propylene or cis-2-butene at a low temperature of 30 °C. The initial activity declined sharply as the extent of pyridine poisoning of the Lewis acid sites increased. Therefore, it was concluded that strong Lewis acid sites (25–30% of the total Lewis acid content) were active in polymerization over silica–alumina.