bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Effect of the Pressure on the Electrical Conductivity of Zinc Sulfate in Water
Authors: Taniguchi Yoshihiro , Watanabe Takashi , Suzuki Keizo 
Published: July 2006

Abstract
The electrical conductivity of ZnSO4 in water was measured at high pressures up to 3000 kg/cm2 and at 25 °C. The dissociation constant of the ion pair (Km) increased with an increase in the pressure. The volume change (ΔV°) accompanying the dissociation was −8.0±0.5 ml/mol at 25 °C. The distance of the closest approach (å) of the ion pair, calculated using the observed Km value and the theoretical equation of Bjerrum, increased with an increase in the pressure. In view of these ΔV° and a values, the ion pair of ZnSO4 was assumed to be of the solvent-separated type. It was also concluded that the number of water molecules separating the ions constituting an ion pair increases with an increase in the pressure.
Kinetic Analysis of the Transitory Overshooting of the H+ Concentration in the Cation-exchange Membrane System
Authors: Takeguchi Noriaki , Horikoshi Isamu , Tanaka Shigeo 
Published: July 2006

Abstract
Overshooting with respect to the H+ concentration was studied quantitatively. Systems of two species of cation and one species of anion were studied for example, the 0.2 M-NaCl (initial, s-side) : Collodion-Polystyrene sulfonic acid membrane: 0.02 M-NaCl+0.002 M-HC1 (1-side, constant). The volume of the 1-side solution was greatly larger than that of the s-side solution. The composition of the former was not altered measurably by the transport of ions across the membrane. Because the cation-exchange membrane used was not highly selective, both cation and anion were permeable. The final composition of the s-side solution became equal to the composition of the 1-side solution. In the course of changes toward the final equilibrium, the H+ or HCl concentration temporarily reached far above the final value. An analytical interpretation with two parameters was given, in which the concentration of the most slowly movable ion in the membrane, Cl−, was assumed to decrease monotonously. Moreover, the concentration of next slowly movable ion, Na+, was assumed to change as a result of the force which tends to bring the system toward the imaginary Donnan equilibrium. The Na+concentration at the imaginary Donnan equilibrium toward which the s-side solution is approaching at any given instant was obtained as follows. The (H+ concentration)/(Na+ concentration) ratio at the equilibrium is the same as the corresponding ratio in the 1-side. Moreover, the total concentration of H+ and Na+ at the imaginary Donnan equilibrium is equal to the existing Cl− concentration in the s-side solution.
Preparation and Stereochemistry of the Cobalt(III) Complexes with N,N′-Polymethylenedi(salicylideneamine) and Its Related Compounds
Authors: Ebina Fujio , Kyuno Eishin , Uehara Akira , Tsuchiya Ryokichi 
Published: July 2006

Abstract
Preparation of two series of the cobalt(III) complexes, Na[Co(CN)2(SB)] and [Co(acac)(SB)], was carried out. CN, acac and SB respectively refer to cyanide anion, acetylacetonate anion and the quadridentate Schiff base anion, N,N′-polymethylenedi(salicylideneamine), N,N′-polymethylenedi(α-methylsalicylideneamine) or N,N′-polymethylenedi(2-hydroxy-1-naphthylmethyleneamine). Efforts to obtain Na[Co(CN)2(SB)] only containing the last Schiff base were unsuccessful. It was concluded from their PMR spectra that, for the dicyano complexes, the structure changes from a trans-form to a cis-one via a distorted trans-form, whereas for the acetylacetonato complexes, it changes from a distorted cis-β-form to an undistorted one with an increase in the length of carbon chain in the bridged polymethylene group of the Schiff bases.
Autoxidation of Atactic Polypropylene and Related Alkanes. Rates and Reactivities toward Peroxy Radicals
Authors: Niki Etsuo , Kamiya Yoshio 
Published: July 2006

Abstract
Rates of autoxidations of atactic polypropylene, polystyrene, and several alkanes in solution initiated by azobiscyclohexanecarbonitrile were measured at 90 °C in the absence and presence of added hydroperoxide and the reactivities toward tert-butylperoxyl and tetralylperoxyl radicals were measured. Atactic polypropylene was found to be oxidized faster than expected from the related alkanes. On the other hand, polystyrene was quite resistant to autoxidation. The relative reactivities of secondary and tertiary hydrogens toward t-butylperoxyl radical were obtained as 1: 9.7 and that for primary hydrogen was estimated to be quite small. The observed reactivity of 2,2,4-trimethylpentane was much smaller than the calculated reactivity from the results of simple alkanes, whereas the observed reactivity of atactic polypropylene was higher than the calculated one. The high reactivity of atactic polypropylene for oxidation and toward peroxyl radicals was interpreted as being due to a fast intramolecular propagation. Tetralylperoxyl radical was 3.6 times as reactive as t-butylperoxyl radical toward both atactic polypropylene and 2,6,10,14-tetramethylpentadecane.
An MO Theoretical Investigations of the Electronic Spectra of Divalent Sulfur Compounds
Authors: Sakai Hideki , Yamabe Tokio , Kato Hiroshi , Nagata Shinichi , Fukui Kenichi 
Published: July 2006

Abstract
The singlet transition energies and oscillator strengths of several divalent sulfur compounds are calculated by the semi-empirical ASMO–SCF method. It is shown that the UV absorption bands with transition energies of 5–6 eV observed in these sulfur compounds can be assigned to n-σ1*, n-σ2*, or σ-σ1*, implying that the 3d orbitals of the sulfur atom do not play an important role in these electronic transitions or may contribute absorption bands with higher transition energies.
Aromatic Substitution of Olefins. XXII. Unusual Reaction of p-Bromostyrene with Benzene in the Presence of Palladium(II) Acetate
Authors: Tanaka Hidetsugu , Fujiwara Yuzo , Moritani Ichiro , Teranishi Shiichiro 
Published: July 2006

Abstract
The reaction of p-bromostyrene with benzene in the presence of palladium(II) acetate gave unexpected bibenzyl (2) and trans-stilbene (3) in 12% and 5% yields respectively, in addition to the usual substitution product (1, 47%). This result shows that dehalogenation and subsequent hydrogenation accompany the aromatic substitution of olefins when both iodides and bromides are used.
Studies of the π→π* Absorption Bands of α-Santonin
Authors: Kuboyama Akira , Sato Yoshikuni , Kobayashi Fumio 
Published: July 2006

Abstract
The π→π* S–S absorption spectra of α-santonin in solutions up to the vacuum UV region were obtained. Based on the results of the MO calculations, the observed four π→π* bands of α-santonin could be favorably assigned.
Extinction Coefficients of Maleate and Fumarate Radical Anions and Relative Yield of cis-trans Isomerization in Methanol Glass at 77 K
Authors: Torikai Ayako , Nakano Fumio , Fueki Kenji , Kuri Zen-ichiro 
Published: July 2006

Abstract
The photoisomerization of the γ-rayinduced maleate radical anion (DEM−) to the fumarate radical anion (DEF−) has been studied. The molar extinction coefficients of DEM− and DEF− have been determined to be 2.43×104 1 mol−1 cm−1 and 3.40×104 1 mol−1 cm−1 respectively. The yield of the isomerization from DEM− to DEF− is found to be 0.95.
The Phase Transition of Bismuth(III) Oxide Prepared by the Thermal Decomposition of Bismuth Sulfate
Authors: Matsuzaki Ryoko , Masumizu Hagio , Saeki Yuzo 
Published: July 2006

Abstract
The phase transitions of α-Bi2O3 prepared by the thermal decomposition of Bi2(SO4)3 on heating and cooling are revealed. The phase transition on cooling is remarkably affected by the existence of a small amount of SO4, such as 0.05%, in the Bi2O3.
A Kinetic Study on the Complex Formation of Iron(III) with o-Cresolsulfonphthalein: A Quinoidal Complex
Authors: Nakayama Hiroaki , Fujimoto Masatoshi 
Published: July 2006

Abstract
The kinetics of the 1: 1 complex formation of Fe(III) with o-Gresol Red is studied. The reaction scheme is quite different from that for the monophenolato complexes of Fe(III), and interpreted by the formation of a quinoidal complex.
The ESR Spectra of the Anthanthrene and Binaphthylene Dioxide Cation-radicals
Authors: Ikegami Kôichi , Matsunaga Yoshio , Osafune Kazuteru , Osawa Eiji 
Published: July 2006

Abstract
The ESR spectra of the anthanthrene and binaphthylene dioxide cation-radicals were recorded and analysed.
On the Trimorphism of 7-Hydroxy-3-(p-methoxyphenyl)-4,6-dimethyl-1-indanone
Authors: Takatori Masayuki , Kanomata Kazuko 
Published: July 2006

Abstract
The reaction of 2′-hydroxy-4-methoxy-3′,5′-dimethylchalcone with anhydrous AlCl3 in benzene gave three kinds of crystals having different melting points. It is concluded that the crystals are three modifications of 7-hydroxy-3-(p-methoxyphenyl)-4,6-dimethyl-1-indanone on the basis of their mutal transformations, IR spectra and X-ray analysis.
The Synthesis of the Benzofuro[2,3-b]benzofuran Derivative
Authors: Nanbu Mutsumu , Momonoi Kaishû , Oguro Susumu , Kawase Yoshiyuki 
Published: July 2006

Abstract
The synthesis of 2,9-dimethoxybenzofuro-[2,3-b]benzofuran from its 5a,10b-dihydro-compound was carried out by bromination with N-bromosuccinimide, followed by dehydrobromination. The attempted preparation of 2,9-dimethyl-, 2,9-dichloro-, and 2,4,7,9-tetrachloro-derivatives was unsuccessful.
α-(3-Phenoxymethyl-7-oxo-4-thia-2,6-diazabicyclo[3,2.0]hept-2-ene-6-yl)-α-isopropenylacetates, Useful Intermediate from Penicillin to Cephalosporin
Authors: Tanida Hiroshi , Muneyuki Ryonosuke , Tsushima Tadahiko 
Published: July 2006

Abstract
Reaction of α-[2-(Benzothiazol-2-yl)-dithio-3-phenoxyacetamido-4-oxoazetidin-1-yl]-α-isopropenylacetates with phosphorus pentasulfide afforded the title compound. The first step in this reaction is suggested as an intramolecular nucleophilic attack of the thioamide function, initially resulted from the 3-acetamido groups, towards the disulfide-sulfur at the 2 position.
The Triplet State of Acenaphthenequinone Crystals Studied by Means of Zeeman Spectroscopy
Authors: Sano Mizuka , Narisawa Takatoshi , I’haya Yasumasa J 
Published: July 2006

Abstract
The origin peak for the lowest singlet-triplet absorption transition of acenaphthenequinone crystals has been observed at 17981.7 cm−1 at 4.2 K. From the direction of the polarization and the Zeeman intensity pattern at 50 kOe, the lowest triplet-state configuration is identified as 3B1(nπ*). The transition to the state from the ground state gains its intensity from the z-polarized 1A1(ππ*)–1A1 transition through the y-component in the spin-orbit interaction.
Apparent Molal Volumes of n-Alkylammonium Chlorides and Sodium n-Alkanecarboxylates in Dilute Aqueous Solutions
Authors: Sakurai Masao , Komatsu Tsuyoshi , Nakagawa Tsurutaro 
Published: July 2006

Abstract
The densities of dilute aqueous solutions of two homologous organic salts, RNH3Cl and RCOONa, where R varies from H to n-octyl, have been measured at 5, 25, and 45 °C using a buoyancy technique. The apparent molal volumes, φv, of the salts and the limiting partial molal volumes, \barV°, of the individual ions have been evaluated. The contributions of a methylene group to the partial molal volume, \barV°(CH2), as estimated from the \barV° data for longer-chain salts, are nearly the same for both series: approximately 15.3, 15.9, and 16.5 ml/mol at 5, 25, and 45 °C respectively. Compared to these values, on the other hand, the \barV°(CH2) estimated for shorterchain RNH3Cl is larger and that for shorter-chain RCOONa is smaller. The second derivative of the \barV° with respect to the temperature, ∂2\barV°⁄∂T2, which is often regarded as a useful measure of structural effects, is almost independent of the chain length for longer-chain homologues. The concentration dependence of φv does not always vary in a regular manner with the chain length. The present results suggest that the volumetric behavior of aqueous organic electrolyte solutions is more complicated than has previously been believed.
The Reaction of 3H-1,2-Benzodithiole-3-thione with Diphenyldiazomethane
Authors: Tamagaki Seizo , Ichihara Ryoichi , Oae Shigeru 
Published: July 2006

Abstract
3H-1,2-Benzodithiole-3-thione (35S=C&lt;) reacted with diphenyldiazomethane in the presence of copper-(II) acetylacetonate to afford the corresponding 4,5-benzo-3-diphenylmethylene-1,2-dithiole with a predominant extrusion of the exocyclic sulfur atom, while with its selenium analog the exclusive loss of in-ring sulfur was observed, resulting in the formation of the selenium-migrated 4,5-benzo-3-di-phenylmethylene-1,2-thiaselenole.
Infrared and Raman Spectra and Rotational Isomerism of 1,4-Pentadiene
Authors: Inagaki Fuyuhiko , Sakakibara Masaaki , Harada Issei , Shimanouchi Takehiko 
Published: July 2006

Abstract
Rotational isomerism of 1,4-pentadiene has been studied. Normal frequencies have been calculated for the low frequency vibrations of four possible rotational isomers. From the change in the spectra in the gaseous, liquid, glassy, and solid states, it has been concluded that the two skew-skew forms (SS and SS′) and the cis-skew form (CS) are stable in the liquid and gaseous states, the SS and SS′ forms coexist in the glassy state, and only the SS form remains in the solid state. It has also been found that the energy difference among the three isomers in liquid state is not appreciably large.
Presumptive Structures of Activated Complexes of Polarographic Redox Reactions of Unsaturated Organic Compounds. I. Polarographic Reductions of Aromatic Hydrocarbons, Aromatic Aldehydes, and Quinones
Authors: Ueda Yo , Ono Yukio 
Published: July 2006

Abstract
Activated complexes of the polarographic reductions of unsaturated organic compounds were assumed to be formed by the interaction of the π-molecular orbital of each compound with a hypothetical atomic orbital of the electrode employed. Linear correlations were obtained between the mutual differences in the polarographic half-wave reduction potentials of a series of unsaturated organic compounds and the respective differences in the π-stabilization energies calculated on the basis of the presumed structures of activated complexes. These linear relationships were considered to lend experimental support to the propriety of the presumed structures of the activated complexes of the polarographic reductions of unsaturated organic compounds.
Analysis of the Elution Curve in Eluting Lutetium from Cation-Exchanger with α-Hydroxyisobutyric Acid
Authors: Kubota Masumitsu 
Published: July 2006

Abstract
The elution behavior of lutetium from a cation-exchange column with α-hydroxyisobutyric acid solution (pH 3.77) was studied as a function of column distribution ratio of lutetium, flow rate, temperature and amount of lutetium. The elution curve fitted the normal distribution when the flow rate was smaller than 40 cm hr−1 for 0.14 M of the eluant, 60 cm h−1 for 0.12 M and 120 cm h−1 for 0.10 M. However, the normal distribution and constancy of the peak position could not be maintained when the amount of lutetium exceeded 200 μg cm−2. Within the range 15–35 °C, the peak position appeared late and the elution curve became sharper with temperature rise, but the diffusion coefficients remained constant. The value of the height equivalent to the theoretical plate was determined from the position and width of the elution peak which varied as a function of the flow rate. The diffusion coefficients of lutetium ions in the ion-exchange resin and the solution were calculated to be 2.6×10−7−6.4×10−9λ″ cm2s−1 and 4.2×10−5λ″ cm2s−1, respectively, according to Glueckauf’s theoretical equation, where λ″ is the column distribution ratio of lutetium ions. The experimental results make it possible to construct an elution curve for any column distribution ratio of lutetium in the range 2–20, temperature and flow rate.
The Preparation of Several Copper(I) and Silver Polyfluoroalkanethiolates and of Polyfluoroalkyl Aryl (or Alkyl) Sulfides
Authors: Kitazume Tomoya , Ishikawa Nobuo 
Published: July 2006

Abstract
2,2,4,4-Tetrakis(trifluoromethyl)-1,3-dithietane (1) in the KF-DMF system was treated with hexafluoropropene in the presence of CuBr to give copper(I) 1,1,2-tris(trifluoromethyl)tetrafluoropropanethiolate (4). A similar reaction of 1 with alcohols in the presence of CuBr or AgNO3 gave copper(I) (6) and silver 1-alkoxy-1-trifluoromethyl-2,2,2-trifluoroethanethiolate (7) respectively. These copper(I) and silver polyfluoroalkanethiolates condensed with aryl or alkyl iodides to afford 1,1,2-tris(trifluoromethyl)-tetrafluoropropyl (8) and 1-alkoxy-1-trifluoromethyl-2,2,2-trifluoroethyl aryl(or alkyl) sulfides (9).
Isolation and Circular Dichroism of the Isomers of Dicyanobis[(R,R)-1,2-cyclohexanediamine] and bis[(S)-propylenediamine]cobalt(III) Complexes
Authors: Kashiwabara Kazuo , Yamanaka Toshimasa , Saito Kazuo , Komatsu Naoto , Hamada Nobuhiro , Nishikawa Hiroaki , Shibata Muraji 
Published: July 2006

Abstract
Three isomers of trans- and cis-[Co(CN)2{(R,R)-1,2-cyclohexanediamine}2]+ and five isomers of the corresponding (S)-propylenediamine complexes have been isolated by chromatography with Dowex 50W-X8 and SP-Sephadex columns, their geometrical structures being assigned on the basis of the ligand field absorption and PMR spectra. Isomers of cis-[Co(CN)2{(S)-propylenediamine}2]Cl, which have different placement of methyl groups of (S) -propylenediamine, gave different methyl PMR resonances with different chemical shifts. The absolute configuration of the isomers was determined from the circular dichroism in the first spin-allowed d-d and the charge transfer band region. The configurational and the vicinal effect have been discussed.
Photochemical Reactions between Dibromomaleic Anhydride and N-Phenylpyrrole
Authors: Matsuo Taku , Mihara Satoru 
Published: July 2006

Abstract
With the irradiation of dibromomaleic anhydride and N-phenylpyrrole, photosubstitution and photocyclization took place in succession to yield pyrrolo[1,2-a]quinoline-4,5-dicarboxylic anhydride as the final product. On the basis of energy-transfer experiments, both of the reactions were concluded to proceed via triplet species. Solvent effects were carefully examined and the presence of polar reaction intermediates was proposed to account for the solvent-dependent deactivation process.
An Alternative Synthesis of (+)-1,7-Dimethyl-4-endo-isopropyl-8-syn-(2-hydroxyethyl)bicyclo[3.2.1]oct-6-ene, the Key Intermediate for the Synthesis of (+)-Sativene and (+)-Cyclosativene
Authors: Hagiwara Hisahiro , Miyashita Masaaki , Uda Hisashi , Yoshikoshi Akira 
Published: July 2006

Abstract
The title compound, the key intermediate for the synthesis of (+)-sativene and (+)-cyclosativene, has been synthesized through the alternative route starting with (−)-carvone.
The Reaction of Open-chain Unconjugated Dienes with Palladium Acetate. Dependence of the Products on Disposition of the Two Double Bonds
Authors: Adachi Nobuo , Kikukawa Kiyoshi , Takagi Makoto , Matsuda Tsutomu 
Published: July 2006

Abstract
The reaction of open-chain unconjugated dienes with palladium acetate in acetic acid was investigated with particular reference to the behavior of the two double bonds in the course of the acetoxylation. 1,5-Hexadiene produced 3-acetoxymethylenecyclopentane (64%), but 2,6-octadiene bearing two terminal methyl groups gave open-chain acetoxylated products: 3-acetoxy-1,6-octadiene (46%) and 7-acetoxy-2,5-octadiene (47%). The reactions of 1,6-heptadiene and diallyl ether are found to proceed via abnormal anti-Markovnikov addition to afford cis and trans 1-acetoxy-1,6-heptadienes (63%) and γ-acetoxyallyl allyl ethers (84%), respectively. No participation of the second double bond has been observed in the reaction of 1,7-octadiene. The behaviors of these dienes to palladium acetate can be reasonably explained by assuming the formation of π,σ-palladium species possessing a stable pseudo-six membered ring.
Absolute Stereochemistry of Farfugin A
Authors: Tada Masahiro , Moriyama Yoshihiko , Tanahashi Yoshiaki , Takahashi Takeyoshi 
Published: July 2006

Abstract
4,6-Dimethylcoumarin (3) was converted to an enantiomer (1b) of farfugin A, via a levorotatory carboxylic acid (5b). This led to the absolute configuration (1a) for farfugin A.
Conformation and Circular Dichroism of Several N-Acyl-l-prolines
Authors: Nishihara Hisao , Nishihara Koji , Uefuji Tamio , Sakota Naokazu 
Published: July 2006

Abstract
NMR and CD studies were carried out for acetyl-l-proline, isovaleroyl-l-proline, isobutyroyl-l-proline, pivaloyl-l-proline and benzoyl-l-proline. It was found that N-acetyl-l-proline has two rotational isomers about the amide bond, S-trans and S-cis conformers even at room temperature, and that the population of the former is greater than that of the latter except for pivaloyl-l-proline, which consists only of the S-trans conformer. The two isomeric N-acyl-l-prolines showed different CD peaks of opposite sign associated with the n→π* transition of the amide group.
Studies of Enamines. VI. The Formation of New Michael Type Adducts and Pyrrolizine Compounds in the Reaction of Enamines with Pyrrole
Authors: Tashiro Masashi , Kiryu Yoko , Tsuge Otohiko 
Published: July 2006

Abstract
While the reaction of 1-(1-pyrrolidinyl)propene (1a) and -1-butene (1b) with pyrrole (2) under mild conditions afforded the Michael type N,N–1:1 adducts 3, under forcing conditions enamines 1 reacted with 2 to give the Michael type C,N–1:1 adducts 4, accompanied with pyrrolizine compounds 5. It has been shown that the pyrrolizine 5 was formed via the cycloaddition reaction of 1 with an azafulvene intermediate arising from 4 by the elimination of pyrrolidine.
The Molecular Vibrations and Rotational Isomerism of Chloro(cWoromethyl)silane
Authors: Sera Keiichi 
Published: July 2006

Abstract
The infrared spectra of chloro(chloromethyl)silane, ClCH2SiH2Cl, and its deuterated species, ClCH2SiD2Cl, have been measured in the gaseous, liquid, and crystalline states. The Raman spectra have also been measured in the liquid state. The vibrational spectra have shown that two rotational isomers coexist in the gaseous and liquid states, while only one isomer persists in the crystalline state. The fundamental vibrations have been assigned for each isomer. The product rule, the calculation of the skeletal frequencies, and the band contours have indicated that the isomer persisting alone in the crystalline state is the trans form and that the other isomer is the gauche form. The solvent effects of the spectra have shown that the gauche form is more polar than the trans form. The normal vibrations have been calculated in a modified Urey-Bradley force field, and the force constants have been adjusted to predict well the observed frequencies for the isomers of both the parent and its deuterated species.
Photolysis of Ethylene at 1470 Å
Authors: Hara Hiroshi , Kodama Kenji , Tanaka Ikuzo 
Published: July 2006

Abstract
Relative quantum yields of the primary processes in the photolysis of ethylene at 1470 Å were determined. No energized vinyl radical was found. Photolysis in the presence of nitric oxide suggests that about 20% of 1-butene is produced through the direct addition reaction of excited ethylene to ground state ethylene, C2H4*+C2H4→1-C4H8.
The Separation and Determination of Chromium(VI) by Reducing Elution Using Anion Exchange Resin and Sodium Sulfite
Authors: Yamashige Takashi , Izawa Hirofumi , Shigetomi Yasumasa 
Published: July 2006

Abstract
The reducing elution of chromium(VI) by anion exchange using sodium sulfite has been investigated. Chromium(VI) is reduced to chromium(III), which is eluted quickly and easily separated from interfering substances by colorimetry using diphenylcarbazide.
The Solubility Parameter of Tetrasulfur Tetranitride
Authors: Hamada Shuichi , Kudo Yoshiyuki , Kawano Masako 
Published: July 2006

Abstract
The solubilities of tetrasulfur tetranitride in thirteen organic solvents were measured. The solubility parameter of tetrasulfur tetranitride was estimated from the solubilities and its deduced activity to be 13·7 at 25 °C; we assumed it to be regular.