bluuebunny/crossref_metadata_2025_split huggingface dataset:
Studies of the Chemiluminescence of Several Xanthene Dyes. VI. A Kinetic Analysis of a Blue-fluorescent Product in the Chemiluminescent Reaction of Eosin Y with Hydrogen Peroxide
Authors: Kamiya Isao , Aoki Keizo 
Published: July 2006

Abstract
In the present study, we found that the absorbance at 395 nm of the chemiluminescent reaction system of eosin Y with hydrogen peroxide initially increased to a maximum, and then gradually decreased. From the finding that the absorption spectrum of a chromatographically-isolated blue-fluorescent product (ME) showed a peak at the same wavelength (395 nm), we could confirm that the increment of the absorbance at 395 nm (Δ395) was mainly due to the generation of ME; we then extended the investigation of the mechanism for the chemiluminescent reaction by a kinetic analysis of ME. The observed value of Δ395 could be approximately calculated by the expression of [ME], which was derived from a kinetic scheme proposed in the previous paper. The ratio of the generation rates of ME in different media, which was calculated from the observed values of Δ395, was in good agreement with that estimated from the curves of the chemiluminescence emission intensity versus the time measured in the media. These results gave additional evidence in support of the view that the blue-fluorescent species is the primary excited product in the reaction.
Estimation of Individual Ionic Activity Coefficients from Conductivity Data on Strong Electrolytes in Dilute Aqueous Solutions
Authors: Tamamushi Reita 
Published: July 2006

Abstract
The individual ionic activity coefficients of strong electrolytes in dilute aqueous solutions are derived from the ionic conductivity data, using the Debye-Hückel-Onsager theory of strong electrolyte solutions. The mean activity coefficients computed by the present method are in good agreement with the experimental values in most of the uni-univalent and some of the uni-multivalent electrolytes studied, which demonstrates the validity of the method in deriving the individual ionic activity coefficients. Comparisons are made of the values of individual activity coefficients of various ions in dilute aqueous solutions of strong electrolytes, as determined by different methods including measurements of potential differences across membranes at varying concentrations. The influence of the ion of opposite sign on the individual ionic activity coefficient has been observed.
The Catalytic Activity of Some Mixed Oxides for Depolymerization of Paraldehyde
Authors: Walvekar S P , Halgeri A B 
Published: July 2006

Abstract
Depolymerization of paraldehyde in benzene catalyzed by SiO2–ZrO2, SiO2–TiO2, Al2O3–ZrO2, TiO2–ZrO2, Al2O3–TiO2 (calcined at various temperatures) has been studied. It is observed that in all the cases the catalytic activity (first order rate constant, k) exhibited a maximum against the temperature of heat treatment of the catalyst. The acid sites at pKa≤−3.0 correlate best with catalytic activity for depolymerization of paraldehyde.
Syntheses of Pyrrolotropone Derivatives from Benzocycloheptene-5,6-dione Monoarylhydrazones. II. Syntheses of Benzo[5,6]cyclohept[l,2-b]-indole-6,11,12-triones
Authors: Fujimori Kunihide , Yamane Kameji 
Published: July 2006

Abstract
Benzo[5,6]cyclohept[1,2-b]indole-6,11,12-triones (benzoindolotropoquinones)(VIIIa–c) were prepared by the oxidation of 11,12-dihydrobenzo[5,6] cyclohept[1,2-b]indol-6-ones (Va–c) with sodium dichromate in acetic acid. Compound VIIIa was rearranged by means of a coned sodium hydroxide solution into a known benzocarbazole-1,4-quinone. The pyrrolotropolone derivative (VII) was also obtained through the ring closure of the 5-hydrazinotropolone derivative (VI).
Dopaquinone and Related Compounds: Reactions with o-Phenylenediamine
Authors: Omote Yoshimori , Hirama Tokuo , Komatsu Toshihiko 
Published: July 2006

Abstract
The oxidation of 4-substituted catechols including DOPA with o-chloranil or cerium(IV) sulfate to give the corresponding o-benzoquinones was examined. The trapping of o-benzoquinones with o-phenylenediamine immediately after oxidation was successfully used to isolate 2-substituted phenazines, the substituents being –CH3, –CH(CH3)2, –(CH2)2CO2H, –(CH2)2CO2CH3, –CH=CHCO2H, –CH=CHCO2CH3, –(CH2)2NHCOC6H5, and –CH2CH(NHCOC6H5)CO2CH3. Dopaquinone was identified in a protected form.
Syntheses and Reactions of Optically Active Polymers. I. Syntheses and Polymerizations of N-Vinylbenzyl-l-amino Acid Derivatives
Authors: Narita Mitsuaki , Akiyama Masayasu 
Published: July 2006

Abstract
N-Vinylbenzyl-l-amino acids were synthesized by the reaction of l-amino acids with formylstyrenes and the subsequent reduction of the condensation products with sodium borohydride. The procedure was performed without protection of the various functional groups of amino acids and racemization was not accompanied by the above process. The method is useful for the synthesis of optically active vinyl monomers containing various amino acids with their intact functionality. As a representative l-amino acid, a variety of N-vinylbenzyl-l-leucine derivatives such as N-methyl-l-leucine, l-leucine ethyl ester, l-leucinol and N-formyl-l-leucine ethyl ester were prepared by means of chemical transformation. These optically active monomers of leucine derivatives were polymerized to optically active polymers.
The Stereochemistry of the Addition of Trimethylaluminum to Decalones and Methyl-substituted Cyclohexanones
Authors: Suzuki Toshimitsu , Kobayashi Toshiaki , Takegami Yoshinobu , Kawasaki Yuzo 
Published: July 2006

Abstract
The addition to the methyl-substituted 4-t-butylcyclohexanone was studied, providing that the β-axial methyl and α-axial methyl groups hindered the axial and equatorial attacks respectively. The results obtained with fused-ring system ketones (four decalones) were explained by considering the similar stereochemical influence of 2-and 3-methylene substituents as corresponding methyl substituents. A rapid conformation equilibrium was also considered for cis-decalones. In addition, the axial attack, especially at a molar ratio of two or more, was found to be hindered by the α-equatorial methyl group. This hindrance was explained by assuming the half-chair form of the cyclohexanone ring in the transition state.
Reaction of Biguanides and Related Compounds. X. The Cyclization of Arylbiguanides with Acyl Isothiocyanates
Authors: Furukawa Mitsuru , Goto Motoo , Hayashi Seigoro 
Published: July 2006

Abstract
The reactions of arylbiguanides with benzoyl and ethoxycarbonyl isothiocyanates gave 4(or 2)-arylguanidino-2(or 4)-phenyl-6-thioxo-1,6-dihydro-s-triazines and 4-arylguanidino-2-oxo-6-thioxo-1,4,5,6(or 1,2,3,6)-tetrahydro-s-triazines respectively, both of which were then converted into the corresponding oxo compounds, in which the thioxo group was converted into the oxo group, by oxidation with hydrogen peroxide. The condensation of 3-amidino-1-aryl-2-thioureas with aryl isothiocyanates afforded 1-aryl-2-arylimino-4-imino-6-thioxo-1,4,5,6-tetrahydro-s-triazines, which were also formed by the pyrolysis of 3-amidino-1-aryl-2-thioureas.
Preparation and Thermal Decomposition of Acyl Carbamoyl Peroxides
Authors: Okazaki Renji , Simamura Osamu 
Published: July 2006

Abstract
Thirteen acyl carbamoyl peroxides, a new class of peroxides, were prepared by addition of peroxy-acids to organic isocyanates and their properties were examined. The thermal decompositions, especially of benzoyl N-(p-nitrophenyl) carbamoyl peroxide and benzoyl N-benzoylcarbamoyl peroxide, were studied in crystalline state and in solution, and it was shown that they decompose via three different mechanisms, involving either an amino-radical, a nitrene or a protonated nitrene, depending on reaction conditions.
Furanoeremophilane-6β,10β-diol and Its Derivatives. New Furanosesquiterpenes from Ligularia japonica LESS
Authors: Tada Masahiro , Moriyama Yoshihiko , Tanahashi Yoshiaki , Takahashi Takeyoshi 
Published: July 2006

Abstract
Three new furanosesquiterpenes have been isolated from Ligularia japonica LESS., and their structures including absolute configurations have been determined as furanoeremophilane-6β-diol (1), 10β-hydroxyfu-ranoeremophilan-6β-yl 2′ξ-methylbutanoate (2), and 10β-hydroxy-6β-methoxyfuranoeremophilane (3).
Synthesis of TACK, a New Chloromethyl Ketone Derivative of Arginine
Authors: Inouye Ken , Sasaki Atsushi , Yoshida Nobuo 
Published: July 2006

Abstract
A synthesis is described of TACK, the chloromethyl ketone derivative of Nα-tosyl-l-arginine, in which a crystalline intermediate NG-nitro-TACK is found to be converted into TACK with hydrogen fluoride without appreciable impairment of the chloromethyl ketone moiety.
Effect of Additive on Solid State Reaction. II. A Thermoanalytical Study of the Effect of Fluorides on the Formation of MgAl2O4 in Initial Stage
Authors: Shimada Shiro , Furuichi Ryusaburo , Ishii Tadao 
Published: July 2006

Abstract
The promoting actions of fluoride on the formation of MgAl2O4 in the initial stage have been studied by means of DTA and high-temperature X-ray diffraction techniques. LiF, NaF, MgF2, GaF2 and BaF2 were used as additives. The three MgO–Al2O3–fluoride (LiF, NaF or BaF2) systems showed similar DTA curves; an endothermic peak (peak-1) in the temperature range 660–800 °C, followed by an exothermic peak (peak-2) at 700–900 °C. The DTA curves for MgO–Al2O3–fluoride (MgF2 or CaF2) systems showed no thermal change. It was found that peak 1 corresponds to Reaction (2), 3MF+2Al2O3=3MAlO2+AlF3, and peak 2 to Reaction (1), 3MgO+2AlF3=3MgF2+Al2O3, and the formation of MgAl2O4. It was concluded that Reaction (2) takes place before the formation of MgAl2O4 and that AlF3 resulting from Reaction (2) initiates the formation of MgAl2O4.
The Photo-desulfurization of Crude Naphtha by UV Irradiation
Authors: Baba Yoshio 
Published: July 2006

Abstract
The photolysis of crude naphtha in the presence of an oxidizing reagent was studied with a view to accomplishing the desulfurization of crude naphtha. The irradiation of crude naphtha consisting of 0.15% sulfur by means of a 200-W high-pressure mercury-vapor lamp, with the aeration of air or oxygen at the flow rates of 5–15 ml/min at 0 °C, resulted in an 80–90% photolysis of the principal mercaptans and sulfides in the crude naphtha within 20 min. The major photo-oxidation products were water-soluble oxygenated sulfur compounds; thus, this process resulted in 67.8% desulfurization when the irradiated naphtha was washed with water. The effects on the photolysis of the molecular weights and the structures of sulfur compounds were also examined with 11 mercaptans and 3 sulfides.
Studies on the Metal Complexes of Quinoxaline Derivatives. III. Metal Chelates of 2-Quinoxalinecarboxylic Acid and Its N-Oxides
Authors: Kidani Yoshinori , Ohira Kazuo , Koike Hisashi 
Published: July 2006

Abstract
Spectrophotometric measurements were carried out for the stability constants of the divalent metal chelates of 2-quinoxalinecarboxylic acid and copper, nickel, cobalt and zinc in a 5% aqueous ethanol solution. Successive stability constants, logK1, of the copper, nickel, cobalt and zinc chelates were 3.30, 2.87, 2.83 and 2.80, respectively. The metal complexes were difficult to dissolve in water. Copper and cadmium afforded both 1 : 1 and 2 : 1 complexes, while other divalent metals such as nickel, cobalt, manganese, zinc and lead resulted in the 2 : 1 complex formation. From the results of IR and Far-IR spectral analyses it was found that the carboxyl group and the ring nitrogen group appear simultaneously in the chelate formation. Copper complexes of 2-quinoxa-linecarboxylic acid 1- and 4-oxides, as well as its 1,4-dioxide were also studied.
Substitution Effect in the Hydrogenation of Monoalkylbenzenes with Ruthenium Catalyst
Authors: Yoshida Toshihisa 
Published: July 2006

Abstract
The influence of substituents on adsorption coefficients as well as rate constants can be understood from the rules of Horiuti-Polanyi and Taft. It is suggested that a nucleophilic adsorption of alkylbenzene and a nucleophilic surface reaction of the adsorbed alkylbenzene with the metal-hydride occur successively.
Molten-State Spectra of Anisyl-p-Benzoquinones
Authors: Aihara Jun-ichi 
Published: July 2006

Abstract
The absorption spectra of three anisyl-p-benzoquinones were observed in the molten state. Interestingly, only the p-anisyl isomer was found to form a selfcomplex in the molten state as in the solid state. Possible explanation was presented for this effect.
The Absorption Spectra of the Electrochemically-generated Unstable Species of Tris(2,2′-bipyridine)cobalt(II) by Reflectivity Measurements at the Silver Electrode in Propylene Carbonate
Authors: Sato Yuichi 
Published: July 2006

Abstract
Tris(2,2′-bipyridine)cobalt(II) perchlorate gave a two-step reduction wave ascribed to [Co-(bipy)3]2+\oversete→[Co(bipy)3]+\overset2e→[Co(bipy)3]− at the Ag electrode in a propylene carbonate solution. The simultaneously-recorded reflectivity-potential curve showed a reflectivity decrease corresponding to each wave on the i-E curve. The absorption spectra due to the unstable reduction products, [Co(bipy)3]+ and [Co(bipy)3]−, were obtained by plotting the reflectivity change vs. the wavelengths.
The Crystal Structure of Bis(1-(2-thiazolylazo)-2-naphtholato)nickel(II)
Authors: Kurahashi Masayasu 
Published: July 2006

Abstract
The crystals of bis(1-(2-thiazolylazo)-2-naphtholato)nickel(II), [Ni(TAN)2], are triclinic with unit-cell dimensions: a=12.38(6), b=12.72(6), c=8.41(4) Å, α=78.9(5), β=95.0(5) and γ=115.1(5)°, Z=2, space group P\bar1. The TAN is terdentate, one nickel atom being surrounded octahedrally by two ligand anions in the mer configuration.
The Preparation of Mixed Cobalt(III) Complexes of N,N-Bis(2-aminoethyl)-glycine with the Carbonate or Oxalate Ion
Authors: Nakashima Syoji , Shibata Muraji 
Published: July 2006

Abstract
mer(N)- and fac(N)-[CoCO3(i-dtma)] complexes have been prepared by the reaction of the tetradentate ligand with the [Co(CO3)3]3− complex. The corresponding [Coox(i-dtma)] complexes have been derived from the mer(N)-carbonato complex.
Miscibility of Lithium with Lithium Chloride and Lithium Chloride–Potassium Chloride Eutectic Mixture
Authors: Nakajima Tsuyoshi , Minami Ryohei , Nakanishi Koichiro , Watanabe Nobuatsu 
Published: July 2006

Abstract
The mutual solubilities of Li–LiCl and Li–LiCl–KCl systems were determined both in liquid-liquid and solid-liquid equilibrium regions. No critical solution temperature was observed for Li–LiCl system. The enthalpy of solution of LiCl in Li was estimated and compared with those for other alkali metal-alkali halides.
The Hydrolysis of Several Purine Nucleosides with Strong Hydrochloric Acid or Cation Exchange Resin
Authors: Suzuki Yoshihisa 
Published: July 2006

Abstract
The rates of hydrolysis were determined for several purine nucleosides with aq. HCl(0.1–4 M) or cation exchange resins(H-form) at 30 °C. The hydrolysis of adenosine with Diaion SK-1B is slower than guanosine while that with HG1 is faster. This discrepancy was discussed.
13C Nuclear Magnetic Resonance Spectra of Unsymmetrical Naphthyridines
Authors: Hirota Minoru , Masuda Hideyuki , Hamada Yoshiki , Takeuchi Isao 
Published: July 2006

Abstract
13C Nuclear magnetic resonance spectra of some naphthyridines were measured and the chemical shifts were compared with those theoretically calculated by an SCF-MO method of π-electron system. Fairly good linear relationship is observed between these values.
A New Condensed Gas Calorimeter. Thermodynamic Properties of Solid and Liquid Dinitrogen Oxide
Authors: Atake Tooru , Chihara Hideaki 
Published: July 2006

Abstract
A new adiabatic calorimeter for use with condensed gases from 1.8 K to room temperature has been constructed. The heat capacity of solid and liquid dinitrogen oxide was measured between 1.9 and 184 K together with the vapor pressure above 146 K. The residual entropy was re-evaluated as 6.0 J K−1 mol−1, which is now closer to R ln2, suggesting that the disorder of molecular end-for-end orientation is perfectly frozen in the solid state. The moments of lattice frequency spectrum were derived from low-temperature heat capacities and hightemperature vapor pressures. The anomalous increase of heat capacity below the triple point was interpreted as arising from thermal creation of orientational defects with the enthalpy of formation 10.8 kJ mol−1. Other thermodynamic quantities determined are as follows: triple point of pure N2O 182.407±0.002 K, heat of fusion 6516±20 J mol−1, entropy of fusion 35.7±0.1 J K−1 mol−1, heat of vaporization at 184.81 K and 101.7 kPa 16544±20 J mol−1, normal boiling point 184.74 K, translational zero-point energy 1.6±0.3 kJ mol−1, Debye temperature corresponding to 3N degrees of freedom 141.0±1.0 K.
The Crystal Structure of the 2:1 Complex of Pyromellitic Dianhydride with trans-4-Methylstilbene
Authors: Kodama Toshiko , Kumakura Shigekazu 
Published: July 2006

Abstract
The 2: 1 complex of pyromellitic dianhydride with trans-4-methylstilbene crystallizes in the Cc space group with four pyromellitic dianhydride molecules and two trans-4-methylstilbene molecules in a unit cell with dimensions of a=12.780, b=7.446, c=15.050 Å, and β=91.09°. In addition to the clearly-defined Laue spots, diffuse streaks elongated perpendicular to the molecular layers were observed with a half period of the b* axis of the reciprocal lattice. The structure was solved from a three-dimensional |E|2 Patterson synthesis and was refined by a block-diagonal least-squares method to the final R value of 0.13 for the visually-estimated 703 reflections. Refinement was difficult, however, because of the large correlation between parameters caused by the disorder. The crystal is built up of molecular layers stacked parallel to the (10\bar2) plane and is disordered in the stacking arrangement of the molecular layers. The pyromellitic dianhydride molecule and one of the benzene rings of the trans-4-methylstilbene molecule are alternately stacked plane-to-plane in infinite columns along [10\bar2]. The ethylene group of the trans-4-methylstilbene molecule joins the two columns. The molecular arrangement of the component molecules resembles those observed in the anthracene, pyrene, and perylene complexes with pyromellitic dianhydride and presents a striking contrast to that of the trans-stilbene complex. The interplanar distances range from 3.25 to 3.56 Å, smaller than that of the trans-stilbene complex.
The Mechanism for the Sulfonation of Olefins with a Sulfur Trioxide–Dioxane Complex
Authors: Nagayama Masuzo , Okumura Osamu , Noda Seiji , Mandai Hiroshi , Mori Akira 
Published: July 2006

Abstract
The rates for the sulfonation of 1-dodecene with the sulfur trioxide–dioxane complex were measured spectrophotometrically. A bimolecular process occurred in this reaction, the rate being proportional to [1-dodecene] [SO3-dioxane]. Furthermore, the stereochemistry of the initial products of the sulfonation reaction between cis or trans-2-butene and the sulfur trioxide-dioxane complex was studied. An equimolar amount of sulfur trioxide–dioxane (1 : 1) was added to cis- or trans-2-butene in chloroform to give the sultone, (I) or (II); (I) 1.5(q), 4.7–5.1 (m), JAB 7.9, JBC 8.0, JCD 6.0 Hz; (II) 1.5(q), 4.2–4.6(m), JAB 6.8, JBC 5.4, JCD 6.8 Hz. These results indicate that the 2,3-butanesultones were produced stereospecifically from the corresponding 2-butene isomers. Similarly, the sulfonation of cis- or trans-2-pentene with sulfur trioxide-dioxane gave the corresponding 2,3-pentanesultones.
A Study of the Recoil Labeling of Fluothane with 82Br during Neutron Irradiation
Authors: Kudo Hiroshi , Mogi Terutomi , Hoizumi Kiyoshi 
Published: July 2006

Abstract
1,1,1-Trifluoro-2-chloro-2-bromoethane labeled with 82Br (fluothane-82Br) was purely separated from neutron-irradiated fluothane by means of a gas-chromatographic technique. The maximum radiochemical yield of fluothane-82Br was 38.3% when the target material was irradiated with neutrons to nvt of 3.4×1016 n·cm−2. Of the many organic species produced by the recoil events following the radiative neutron capture and subsequent (I.T.) processes, CF382Br and CF3CHBr82Br were also identified. In order to elucidate the mechanism of recoil labeling, the scavenger effects were examined in the CF3CHClBr–Br2 system, Br2 being used as a radical scavenger. The “high-energy” yields of CF3CHCl82Br thus estimated were approximately 3.6 to 4.8%. It was suggested that most of the 82Br-labeled species were formed through the “thermal” processes including the reaction of 82Br with the organic radicals produced by the radiolysis of the parent fluothane.
The Estimation of the G-Values for the Ionization and Excitation of Noble Gases Irradiated by 100 keV Electrons
Authors: Sato Shin , Okazaki Kiyoshi , Ohno Shin-ichi 
Published: July 2006

Abstract
The binary-encounter collision theory has been applied to the calculation of the G-values for the ionization and excitation of noble gases irradiated by 100 keV electrons. The G-values obtained were as follows in the order of He, Ne, Ar, Kr, and Xe: 2.27, 2.19, 2.81, 3.20, 3.45 for G(electrons), 0.85, 1.55, 1.92, 1.64, 1.51 for G(singlet states), and 0.17, 0.07, 0.13, 0.23, 0.39 for G(triplet states). The method of the calculation and the significance of the results were discussed.
Interactions of 1-Substituted 2,4-Dinitrobenzenes with Methoxide and Hydroxide Ions in Dimethyl Sulfoxide with a Rapid Scan Spectrophotometer
Authors: Hasegawa Yoshinori 
Published: July 2006

Abstract
The interactions of m-dinitrobenzene and 1-substituted 2,4-dinitrobenzenes with sodium methoxide in meth-anolic dimethyl sulfoxide were studied with a rapid scan spectrophotometer. A similar study of 1-substituted 2,4-dinitrobenzenes with sodium hydroxide in aqueous dimethyl sulfoxide was carried out. Except for a few cases, the first transient colored-complexes of 3-substituted 2,6-dinitrocyclohexadienates were observed at initial stages before the complete formation of second colored-complexes having the π-electronic structures of 1,3-dinitropentadienyl anion.
Thermochemical Studies on Platinum-Olefin Complexes. I
Authors: Sen\={o} Manabu , Iwamoto Kazutoshi , Asahara Teruzo 
Published: July 2006

Abstract
Using a twin-type calorimeter, the enthalpy changes of solutions and reactions with aqueous KCN solution of Zeise’s salts, K[PtCl3(olefin)], were measured. As ligand olefins, ethylene, propylene, 1-butene, 1-pentene, and 1-hexene were employed. It was estimated from a thermochemical analysis that the order of strength of platinum-olefin bonding is as follows; K[PtCl3(C3H6)]\gtrsimK[PtCl3(C3H6)]\gtrsimK[PtCl3(1-C6H12)]\gtrsimK[PtCl3(1-C4H8)]\gtrsimK[PtCl3(1-C5H10)]. This order was compared with the data of infrared spectra and both the results coincide with each other.
Differential Thermal Analysis of Some Tervalent Metal Chelates of 1,5-Dialkylpentane-2,4-dionates
Authors: Yoshida Isao , Kobayashi Hiroshi , Ueno Keihei 
Published: July 2006

Abstract
In connection with the purification of metal chelates by zone refining, thermal properties of the following β-diketone chelates of tervalent cobalt(III), aluminum(III), iron(III), manganese(III), and chromium(III) were investigated by differential thermal analysis (DTA). The β-diketones used in this study were heptane-3,5-dione, nonane-4,6-dione, 2,6-dimethylheptane-3,5-dione, 2,8-dimethylnonane-4,6-dione, 2,2,6,6-tetramethylheptane-3,5-dione, and tridecane-6,8-dione. Metal chelates of the alkyl substituted pentane-2,4-diones showed a lower melting- and higher decomposition temperature in comparison with the pentane-2,4-dionates. Discussion is given on the effects due to the structures of the alkyl substituents upon thermal properties of the hexacoordinate metal chelates.