bluuebunny/crossref_metadata_2025_split huggingface dataset:
ON THE DISSOLUTION VELOCITY OF OXYGEN INTO WATER. PART V. THE OXIDATION VELOCITY OF SODIUM SULPHITE SOLUTION BY OXYGEN IN THE PRESENCE OF THE MOLECULAR FILM OF FATTY ACID
Authors: Miyamoto Susumu , Kaya Tetsuo , Nakata Akira 
Published: July 2006

Abstract
(1) The monomolecular or multimolecular films of stearic acid or of palmitic acid were formed at the upper surface of sodium sulphite solution, and the velocity of the oxidation of sodium sulphite solution was studied, the main body of the solution being well agitated with a stirrer of special construction. It was confirmed that the velocity of the oxidation of sodium sulphite solution by oxygen, observed in the presence of the molecules of these fatty acids, and that observed in the absence of the molecules of the fatty acids, are almost identical under the conditions above described.
(2) A short discussion on the result of the present experiments was made.
The assumption, that a stationary liquid layer is present at the interface between gas and liquid, seems to be unfavourable to the interpretation of the phenomenon observed by the present writers. It was stated that the assumption, that the molecules of fatty acid at the upper surface of the liquid will also be agitated by the stirring of the main body of the liquid and covered with the solution, has great probability for the interpretation of the result of the present experiments.
(3) The mechanism of solution of gas into liquid was shortly discussed.
A part of the opinion of one of the present writers (Miyomoto) on the rate of solution of gases into liquids was described.
STUDIES ON THE FUSED PRODUCTS OF Cr2O3-SiO2 SYSTEM
Authors: Yamaguchi Yohei , Nakazawa Haruo 
Published: July 2006

Abstract
(1) The mixtures of chromic oxide and silica were electrically fused and by the experimental conditions the products of different colours were obtained.
(2) The beautiful green and glassy fused product was obtained only by the second reheating process.
(3) The products of different colours were examined by the petrographic microscope.
(4) The experimental conditions to obtain the each product of different colours were discussed.
ON THE DIBASIC ACIDS IN A FEW SUMACH BERRY WAXES
Authors: Tsujimoto Mitsumaru 
Published: July 2006

Abstract
(1) The crude dibasic acids in urushi wax amounted to about 63% of the fatty acids. Their chief constituent appeared to be eicosane diearboxylic acid, C22H42O4.
(2) Yama-hazé and tsuta-urushi waxes also contained the dibasic acids, which amounted respectively to about 1.6 and 6.3% of the fatty acids. They consisted mainly of heneicosane dicarboxylic acid, C23H44O4.
(3) The fatty acids of yama-urushi wax gave a small amount of a substance of m.p. 102°C. Whether this consisted of the dibasic acids or not, was, however, undecided.
DISPERSOIDOLOGICAL STUDY OF SILVER SALTS IN AQUEOUS ETHYL ALCOHOL, ACETONE AND PROPIONE SOLUTIONS. I
Authors: Ishii Shinjiro 
Published: July 2006

Abstract
In this paper is given a graphical representation of quantitative data pertaining to:
1. The complex solubility of the AgI-precipitate in aqueous ethyl alcohol solutions of KI.
2. The dispergation process in the same solutions.
3. The complex solubility of the AgI-precipitate in aqueous acetone solutions of KI.
4. The dispergation process in the same solutions.
Preparation and Characterization of Cobalt(III) Complexes Containing 1,1,1-Tris(dimethylphosphinomethyl)ethane (mmtp), and the Crystal Structure of [Co(mmtp)2][Co(CN)6]·2.25H2O
Authors: Ando Tadashi , Kita Masakazu , Kashiwabara Kazuo , Fujita Junnosuke , Kurachi Saeko , Ohba Shigeru 
Published: July 2006

Abstract
Eight new cobalt(III) complexes of the type, [CoX3(mmtp)]n+ (mmtp = 1,1,1-tris(dimethylphosphinomethyl)ethane, X3 = (Cl)3, (Br)3, (CN)3, (NH3)3, mmtp, 3-azapentane-1,5-diamine (dien), 1,4,7-triazacyclononane (tacn), and 1,4,7-trithiacyclononane (ttcn)), were prepared and characterized. All of the complexes are stable in the solid state, but the halogeno complexes aquate rapidly in water, and the ammonia complex liberates NH3 slowly in 1 mol dm−3 HCl to give [CoCl2(NH3)(mmtp)]+, other complexes including [Co(mmtp)2]3+ being stable in solution. The crystal structure of [Co(mmtp)2][Co(CN)6]·2.25H2O was determined by X-ray analysis. Crystal data: orthorhombic, space group Pca21, a = 31.579(5), b = 10.521(1), c = 23.458(3) Å, V = 7794(2) Å3, Z= 8, R = 0.084 for 4196 reflections. The Co–P bond distances are 2.291(9)–2.357(7) Å (av 2.331 Å), which are appreciably longer than those usually found in Co(III)–phosphine complexes. The absorption spectra of the complexes were compared with one another and with those of the related complexes.
Synthesis and Intramolecular Electron-Transfer Reaction of Distance-Fixed Quinone-Linked Porphyrins
Authors: Osuka Atsuhiro , Zhang Run Ping , Maruyama Kazuhiro , Yamazaki Iwao , Nishimura Yoshinobu 
Published: July 2006

Abstract
Synthesis is described of a series of distance-fixed quinone-linked porphyrins in which electron affinity of the attached quinone is systematically changed. The fluorescence lifetimes of the porphyrin chromophore in these model compounds were shortened due to the intramolecular electron transfer to the attached quinone. The rates of the charge separation between the singlet excited state of the porphyrin and the quinone were determined on the basis of these shortened fluorescence lifetimes and were plotted against the free energy changes associated with the charge separation. Up to ca. 1.54 eV exothermic reaction, the rates of the charge separation were found to still increase.
Diastereoselective Addition of Grignard Reagents to 3,4-O-Isopropylidene-1-O-triphenylmethyl-l-glycero-2-tetrulose and 1-O-Benzoyl-3,4-O-isopropylidene-l-glycero-2-tetrulose
Authors: Nagano Hajime , Ohno Mina , Miyamae Yoko , Kuno Yukie 
Published: July 2006

Abstract
Diastereoselectivity in the addition of Grignard reagents (RMgX) to 3,4-O-isopropylidene-1-O-triphenylmethyl-l-glycero-2-tetrulose (1) and 1-O-benzoyl-3,4-O-isopropylidene-l-glycero-2-tetrulose (2) depended remarkably on R, X, the solvent, and the reaction temperature. In the reaction of 1 in diethyl ether at 0 °C and 2 in tetrahydrofuran were obtained (2R,3S)-adducts with moderate to high diastereoselectivity, while in the reaction of 2 in diethyl ether at −78 °C (2S,3S)-adducts were the major products. (2R)-2-Hydroxymethyl-2-nonyloxirane and (2S)-2-hydroxymethyl-2-tetradecyloxirane were synthesized.
Selective Friedel–Crafts Alkylation on a Vermiculite, a Highly Active Natural Clay Mineral with Lewis Acid Sites
Authors: Okada Shin-ichi , Tanaka Katsumi , Nakadaira Yasuhiro , Nakagawa Naoya 
Published: July 2006

Abstract
Acid-catalyzed Friedel–Crafts alkylation reactions of p-methylbenzyl chloride with benzene were carried out on four unmodified natural clay minerals. Phenyl-p-tolymethane was quickly and selectively formed in the presence of vermiculite. Although the specific surface area of vermiculite is smaller than those of the other clay minerals examined, such a characteristic property of vermiculite as a catalyst may be attributed to the absence of Brønsted acid sites and to the Lewis acid sites on the outer surface of vermiculite.
Acyliminium Cyclization of Chiral 5-(4-Alkenyl)-5-hydroxy-2-pyrrolidinone Derivatives
Authors: Inouye Yoshinobu , Tazawa Noriko , Watanabe Atsusi , Aoki Yutaka , Kakisawa Hiroshi 
Published: July 2006

Abstract
(3R,4R)-5-(4-Alkenyl)-3,4-bis(benzyloxy)-5-hydroxy-1-methyl-2-pyrrolidinones were cyclized with formic acid to give chiral carbocycles. The 6-membered carbocycle was predominantly formed from (E)-4-alkenyl, while the 5-membered carbocycle was formed from the (Z)-4-alkenyl side chain. One benzyl group was lost during the reaction, resulting in the formation of an ether bridge.
Inclusion Mode of 8-Anilino-1-naphthalenesulfonate (ANS) in the ANS-β-Cyclodextrin Complex
Authors: Nishijo Juziro , Yasuda Masako , Nagai Mayumi , Sugiura Makiko 
Published: July 2006

Abstract
The inclusion mode of 8-anilino-1-naphthalenesulfonate (ANS) in the ANS-β-cyclodextrin complex with a molar ratio of 1 : 1 in deuterium oxide was investigated by measurements of the proton nuclear magnetic resonance spectra and studies with Corey Pauling Koltun models. It was found that in the preferential inclusion mode of ANS, the whole benzene ring of ANS is enclosed at a considerable depth in the cavity of β-cyclodextrin from the side of the secondary hydroxyl group, and a great portion of the naphthalene ring is outside the cavity.
Equation of State for Complex Liquid Mixtures
Authors: Boushehri Ali , Keshavarz Mohammad H 
Published: July 2006

Abstract
The present work shows a successful extension of previous studies to molecular liquids for which the second virial coefficients are not known. Recent advances in statistical-mechanical theory of equilibrium fluids can be used to obtain an equation of state for compressed liquids. The average contact pair distribution function (G), which is at the heart of the equation of state, has the very simple form of a single curve in λb*ρ* (any substance). The effect of many-body forces may still be included in G. The temperature-dependent parameters in the equation can be calculated with reasonable accuracy for most practical purposes just from the experimental heat of vaporization and triple-point density. Thus, thermodynamic consistency is achieved by the use of two scaling parameters (ΔHν, ρt). In terms of these parameters, the reduced second virial coefficient (B2*(T)) obeys a single law of corresponding states in which α*(T) and b*(T) are only slightly modified. The correlations embrace the temperature range Tt ≤ T &lt; Tc and can be used in a predictive mode. The remaining constant parameters are best found empirically from ρt data for pure dense fluids. We tested the equation of state on several liquid mixtures. The results indicate that the density of liquid mixtures can be predicted within about 5% at any pressure and temperature.
Raman Scattering Studies of Vibrational Relaxation in Acetone and 2-Chlorobenzaldehyde
Authors: Bhattacharjee Debajyoti , Ghosh (Purkayastha) Anusree , Misra T N 
Published: July 2006

Abstract
The Raman band of the C=O stretching vibration of acetone and 2-chlorobenzaldehyde has been acquired in a number of solvents of varying physicochemical properties. The effect of solute–solvent dispersion forces on the isotropic frequency shifts has been studied in different solvents (polar and nonpolar both). An attempt has been made to estimate the importance of hydrodynamic and dispersion forces in line broadening of the isotropic component, particularly using the theory of microviscosity.
Conformation of Poly(l-glutamic acid) in Solutions of a Cationic Surfactant with an ω-Hydroxyl Group
Authors: Hayakawa Katumitu , Nagahama Takahiro , Satake Iwao 
Published: July 2006

Abstract
The conformation of poly(l-glutamic acid) was examined based on the circular dichroism spectra in solutions of ω-hydroxyalkylammonium bromides with the dodecyl or undecyl chain and the methyl-, dimethyl- or trimethylammonium moiety, as well as in normal surfactant solutions of dodecylammonium bromides with a corresponding cationic group used as a reference. The conformational change from a random coil to an α-helix was observed, depending on the chain length and head group of the surfactant. A surfactant with a longer chain length induced the α-helix at a lower concentration. A surfactant with more methyl groups has less ability for inducing an ordered conformation, presumably due to a steric hindrance, though it is more hydrophobic. No ordered conformation of poly(l-glutamic acid) was observed in surfactants with the trimethylammonium cationic group.
IR Spectra for Adsorbed CO on Various Alkali Metal Ion-Exchanged ZSM-5 Zeolites
Authors: Katoh Masahiro , Yamazaki Tatsuya , Ozawa Sentaro 
Published: July 2006

Abstract
Carbon monoxide adsorption on alkali metal ion-exchanged ZSM-5 zeolites was investigated by IR spectroscopy. The IR peak positions and intensities of adsorbed CO, and the change in the spectra with temperature are discussed. The IR spectra for physisorbed CO over ZSM-5 zeolites were assigned to the oriented species on a cation, such as M+–C–O and M+–O–C, and the loosely adsorbed CO in the ZSM-5 pore.
Photocatalysis of RhCl(PCy3)2 for Cyclohexane Dehydrogenation: Thermal Dissociation of C–H Bond and Photoelimination of H2
Authors: Itagaki Hiroaki , Murayama Hiroki , Saito Yasukazu 
Published: July 2006

Abstract
Catalytic cyclohexane dehydrogenation, yielding cyclohexene and dihydrogen, proceeded under photoirradiation on either a three-coordinated complex, RhCl(PCy3)2 (Cy = cyclohexyl), or a dihydride complex, RhClH2(PCy3)2, with almost the same turnover frequencies (8.4 or 8.6, respectively) attained by use of a cut-filter (UV-27) under refluxing conditions (354 K). RhCl(PCy3)2 in cyclohexane gave stoichiometric amounts of cyclohexene and RhClH2(PCy3)2 at 354 K; the latter complex yielded little H2 even at 373 K in toluene. A photocatalysis cycle for cyclohexane dehydrogenation with RhCl(PCy3)2 is proposed, where cyclohexene is yielded by thermal C–H bond dissociation and dihydrogen is photoeliminated from RhClH2(PCy3)2, regenerating the original complex.
Intercalation of [Pt(en)2]2+ and [PtCl2(en)2]2+ Ions by Na-Montmorillonite
Authors: Kijima Tsuyoshi , Sakaguchi Kenji , Ohe Kaoru 
Published: July 2006

Abstract
The individual and mixed uptakes of [Pt(en)2]2+ and [PtCl2(en)2]2+ ions by Na-montmorillonite have been studied at 25 °C. In the individual uptakes, the Pt(IV) complex ions are intercalated beyond the cation exchange capacity of the host, which is in striking contrast to the Pt(II) complex ions which are taken up through the capacity. Both complex ions are arranged as a monolayer in which their square-planar PtII(en)2 and PtIV(en)2 planes are parallel and perpendicular to the silicate layers, respectively. The uptake reaction with an equimolar solution of both complexes results in the predominant intercalation of the Pt(II) complex ions, while that with a Pt(IV)-riched mixed solution yields a co-intercalated monolayer in which the Pt(IV) complex ions are held with their square-planar planes tilted by ca. 52° with respect to the silicate layer.
Electrochemical Deposition and Dissolution Processes of Lithium Compound on Gold from Propylene Carbonate
Authors: Yamamoto Nobushige , Hirasawa Hiroshi , Ishida Hidenobu , Tatsuma Tetsu , Oyama Noboru 
Published: July 2006

Abstract
The cathodic electrolysis of propylene carbonate containing lithium perchlorate was studied by means of an in-situ quartz crystal microbalance technique. A lithium compound was deposited at about +1.5 V vs. Li/Li+ and dissolved at about +4.0 V vs. Li/Li+. In constant potential electrolysis at +0.9 V vs. Li/Li+, the deposition process was divided into two stages. In the first stage, in which lithium carbonate was most probably deposited, an electrode reaction of ferrocene which was added to the solution was gradually retarded. In the second stage, in which some chemical reaction proceeded dominantly, the electrode reaction of ferrocene was almost completely blocked. A cathodic charge of +3.0 mC cm−2 was necessary for almost complete blocking.
Oscillatory Chemiluminescence during Peroxidation of Umbelliferone Catalyzed by Horseradish Peroxidase
Authors: Segawa Tadashi , Suehara Shinji , Kamidate Tamio , Watanabe Hiroto 
Published: July 2006

Abstract
The chemiluminescence (CL) which occurred during oxidation of umbelliferone catalyzed by horseradish peroxidase (HRP) oscillated, when a high concentration of H2O2 was employed. The oscillatory CL response reflected periodic changes in the concentration of HRP intermediates between active states, compound I and compound II, and an inactive state of compound III. When the reaction was initiated, the CL was generated by the action of compound I and compound II. Then, the concentration of compound III was gradually increased, because the formation of compound III from compound II and H2O2, the rate constant of which was very little, could not be ignored in a high H2O2 condition; thus the CL was decreased by degrees. Compound III was then decomposed into the active HRP intermediates and the CL was re-increased. The repetition of those processes causes the oscillation. A kinetic study on the mechanism of the oscillatory CL was performed with trial rate equations.
Application of Adduct Formation and Masking Effect to Separation of Some Metal Chelates of 3-Mercapt-1,5-diphenylformazane in Reversed-Phase High-Performance Liquid Chromatography
Authors: Suzuki Tomohiro , Tsunoda Kin-ichi , Akaiwa Hideo 
Published: July 2006

Abstract
The adduct formation and the masking effect due to the addition of neutral ligands to mobile phase were applied to improve the mutual separation of some metal chelates of 3-mercapt-1,5-diphenylformazane (dithizone) in reversed-phase high-performance liquid chromatography. The addition of trioctylphosphine oxide and triethanolamine (TEA) was effective for controlling the retention time of some metal dithizonates. The addition of TEA made it possible to separate the overlapped peaks of nickel(II) and zinc(II) dithizonates from each other. On the other hand, 1,10-phenanthroline (phen) masks NiII and ZnII selectively depending upon stabilities of their charged phen complexes. The degree of the masking effect of phen was predictable to some extent from the stability constants of the metal dithizonates and the metal–phen complexes.
Synthesis and Antioxidant Activity of 4H-1,3-Benzodioxin-6-ol Derivatives: New Vitamin E Analogs
Authors: Kaneko Yutaka , Kita Hiroshi , Mukai Kazuo , Kawano Katsuyuki 
Published: July 2006

Abstract
4H-1,3-Benzodioxin-6-ol (HBD) derivatives 1—5, new tocopherol (Vitamin E) analogs, have been synthesized by condensation of acetaldehyde with the corresponding hydroquinone. For each HBD derivative except for 4, two diastereomeric isomers were produced. These stereoisomers were separated by column chromatography and the configuration of each isomer was identified by two dimensional NMR techniques and ESR measurements of the HBD radicals. The second-order rate constants, ks, for the reaction of 9 kinds of HBD derivatives with substituted phenoxyl radical (PhO·) in ethanol have been measured with a stopped-flow spectrophotometer. These HBD derivatives reacted at rates that were only about 5—20% of those observed with the corresponding tocopherols. The logs of the second-order rate constants, ks, obtained for HBD derivatives were found to correlate with their peak oxidation potentials, Ep. Electron spin resonance measurements were done for HBD radicals in toluene, and the proton hyperfine coupling constants, aiH, and giso-values were determined. The log of the rate constants, ks, was also found to correlate with the sum of the hyperfine coupling constants (a5H + a7H) at 5- and 7-positions of both HBD radicals and tocopheryloxyl radicals, that is, the unpaired π-spin densities (ρ5 + ρ7) at the two ortho carbon atoms.
Stereochemistry of the Addition Product of N-Aminosuccinimide Moiety to an Acetylenic Ester
Authors: Srivastava Alaka , Srivastava Vandana , Verma Shiva M , Pattabhi Vasantha 
Published: July 2006

Abstract
1H, 13C NMR and X-ray crystallography have demonstrated the azomethine structure of the addition product obtained from N-amino-2,3-(9,10-dihydro-9,10-anthracenediyl)succinimide and diethyl acetylenedicarboxylate. The exo cyclic nitrogen exists in sp2-state and its lone pair lies in anti orientation while the diethyl succinate moiety has been demonstrated to be syn to the cage and orthogonal to the succinimide plane. On acetylation the product is transformed into N-acetyl derivative which exhibits restricted rotation about N–N bond and a preferred conformation with N-acetyl in syn-orientation.
Total Synthesis of (+)- and (−)-Neopyrrolomycins, Chlorinated Phenylpyrrole Antibiotics
Authors: Tatsuta Kuniaki , Itoh Manabu 
Published: July 2006

Abstract
The first total synthesis of (+)- and (−)-neopyrrolomycins (11a and 11b) is detailed based on regioselective chlorinations of 3,5-dichloroanisole (2) and 1-(2,3,4-trichloro-6-methoxyphenyl)-1H-pyrrole-2-carboxylic acid (8) with isocyanuric trichloride, followed by optical resolution of racemic neopyrrolomycin (11) with N-(p-tolylsulfonyl)-l-phenylalanyl chloride. Several analogs (21—25) have been prepared from the intermediates, and the structure-activity relationships are also discussed.
Acid-Promoted Electron Transfer to Facilitate Oxidative Polymerization of Diaryl Disulfides
Authors: Oyaizu Kenichi , Iwasaki Naoki , Yamamoto Kimihisa , Nishide Hiroyuki , Tsuchida Eishun 
Published: July 2006

Abstract
A catalytic amount of Lewis acids ([Lewis acid]/[Disulfide] = 1/200) facilitated electron transfer from diaryl disulfides to a stoichiometric amount of another oxidizing agent by which linear poly[thio(1,4-arylene)] was produced. Such Lewis acids as SbCl5 and FeCl3 facilitated oxidation of diphenyl disulfide by quinones more efficiently than protic acids such as CF3COOH, where the Lewis acid showed more than 200-fold more activity than the protic acid. Oxovanadium complex-catalyzed oxygen-oxidation of disulfides was also facilitated by these Lewis acids. The catalysis of these Lewis acids includes not only the activation of quinones or the oxovanadium complex, but also the lowering of the oxidation potential of the monomers.
The High-Pressure Diels–Alder Reaction of [5,6]-Fullerene-C60 with Cycloheptatriene. Formation of Diels–Alder Adducts with Improved Thermal Stability
Authors: Liu Ji-Feng , Kato Nobuo , Mori Akira , Takeshita Hitoshi , Isobe Ryuichi 
Published: July 2006

Abstract
The high-pressure Diels–Alder reaction of C60 with cycloheptatriene under 300 MPa gave two [4+2] cycloadducts derived from two valence isomers, cycloheptatriene and norcaradiene. The thermolysis of the adducts indicated the tricyclo[3.2.2.02,4]non-6-ene derivative is a kinetically-controlled product.
An EXAFS Study on Metal-Substitution Reaction of Homodinuclear Mercury(II) Porphyrin with Copper(II) in Aqueous Solution
Authors: Tabata Masaaki , Ozutsumi Kazuhiko 
Published: July 2006

Abstract
The metal-substitution reaction of the homodinuclear mercury(II) porphyrin complex, [Hg2(tpps)]2− (H2tpps4− = tetrakis(4-sulfonatophenyl)porphyrin), with copper(II) has been studied by the EXAFS (extended X-ray absorption fine structure) method in an acetate buffer (pH 5.6). The tetrahedral mercury(II) acetato complex (rHg–O = 219 pm, rHg–O = 262 pm) reacts with the porphyrin to form the homodinuclear mercury(II) porphyrin, [Hg2(tpps)(CH3COO)2]4− (rHg–N = 222 pm, rHg–O = 265 pm), with a deformed structure, where two mercury(II) bind to two pyrrole nitrogens from upper and lower sides and pyrrole nitrogens are ruffled. The mercury(II) porphyrin was replaced with the distorted octahedral copper(II) acetato complex (rCu–O = 197 pm, rCu–O = 225 pm) to form the square planar copper(II) porphyrin, [Cu(tpps)]4− (rCu–N = 200 pm). The reaction mechanism of the large catalytic effect of mercury(II) on the copper(II) porphyrin formation is discussed from the structure of Hg2(tpps)2−, and the structure of the heterodinuclear intermediate, [Hg(tpps)Cu]2−, is proposed.
Preparation of 2,2-Dihalocarboxylic Acid Methyl Esters by Oxidation–Chlorination of 2-(1-Haloalkyl)-4-methyl-1,3-dioxolanes with Trichloroisocyanuric Acid
Authors: Boni Monica , Ghelfi Franco , Pagnoni Ugo Maria , Zucchi Claudia 
Published: July 2006

Abstract
Methyl 2,2-dichloro or 2-bromo-2-chloro carboxylates were obtained in excellent yields by oxidation–chlorination of 2-(1-haloalkyl)-4-methyl-1,3-dioxolanes with trichloroisocyanuric acid.
Convenient Synthesis of 2(1H)-Pyridinethione Glycosides
Authors: Elgemeie Galal E H , Attia Adel M E , Elzanate Ali M , Mansour A K 
Published: July 2006

Abstract
A novel synthesis of 2(1H)-pyridinethione glycosides utilizing 2(1H)-pyridinethiones or their sodium salts and α-tetra-O-acetyl-glucosyl or d-galactosyl bromides as starting components is described.