bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Liquid-Phase Oxidation of Aldehydes with Metal Tetra(p-tolyl)porphyrins
Authors: Ohkatsu Yasukazu , Osa Tetsuo 
Published: July 2006

Abstract
The effects of the kind of metal of metal porphyrins and the substituent of the phenyl group of porphynato plane were discussed, using them as catalysts in the autoxidation of aldehydes. The effect of the solvent and the additive on the above-mentioned catalytic activity of the porphyrins was put into order by means of their pKa(BH+) and pKa(BH+) values; the increased pKa(BH+), namely, the electron-donating power of solvents, seemed to lead to their strong coordination, followed by the initiation of the coordination of oxygen. On the other hand, the oxygen which had been activated on the porphyrins was estimated to react with or be stabilized by a solvent with a low pKa(H+); it could not initiate the autoxidation with ease.
The Kinetics and Mechanism of the Radical Addition of Hydrogensulfite Ions to 1-Dodecene in a Micellar Solution of Sodium 1-Dodecanesulfonate
Authors: Miyata Teijiro , Sakumoto Akihisa , Washino Masamitsu 
Published: July 2006

Abstract
The addition reaction induced by Co-60 gamma-rays proceeded without any detectable induction period under homogeneous conditions in the presence of sodium 1-dodecanesulfonate. The consumption rate of 1-dodecene was equal to that of sodium hydrogensulfite and proportional to the square roots of the hydrogensulfite-ion and 1-dodecene concentrations. The g-value of 1-dodecene consumption was 860 at the concentrations of 0.260 mol/l of sodium hydrogensulfite, 0.0966 mol/l of 1-dodecene, and 0.11 mol/l of sodium 1-dodecanesulfonate at the dose rate of 2.70×1015 eV/g·s and the dose of 1.62×1018 eV/g. The apparent rate constant was 2.6×10−4 s−1 under these reaction conditions. The reaction of CH3(CH2)9CHCH2SO3− with the sulfite radical ion was proposed as the termination step of the reaction.
The Reaction of N-(Phenylsulfonyl)benzohydrazonoyl Chloride with N-Substituted Benzamidines, with Benzimidates, and with 2-Aminopyridines
Authors: Ito Suketaka , Tanaka Yumo , Kakehi Akikazu , Miyazawa Hirotaka 
Published: July 2006

Abstract
4-Alkyl or aryl-3,5-diphenyl-4H-1,2,4-triazoles, 3-phenyl-1,2,4-triazolo[4,3-a]pyridine, and -pyrimidine are obtained by the title reactions. The reaction may proceed via the nucleophilic attack of amidine or imidate on the imidoyl carbon of hydrazonoyl chloride and the subsequent intramolecular cyclization of the intermediate formed in the initial step, with the removal of the amino or alkoxyl and phenylsulfonyl groups.
Fluorescence of 9-Aminoacridine Bound to Polynucleotides
Authors: Kubota Yukio , Fujisaki Yasuo 
Published: July 2006

Abstract
The fluorescence of 9-aminoacridine is completely quenched when bound to poly (dG)·poly (dC), the quantum yield of fluorescence being nearly equal to that of free dye when bound to poly d(A–T). The dye bound to DNA shows a weak fluorescence for which the AT pair is responsible.
Light-induced Conformational Changes of Polypeptides. Random Copolymers of γ-Benzyl-l-glutamate with m- and p-Phenylazobenzyl-l-aspartates
Authors: Ueno Akihiko , Anzai Jun-ichi , Osa Tetsuo , Kadoma Yoshinori 
Published: July 2006

Abstract
Copolymers of γ-benzyl-l-glutamate with m- and p-phenylazobenzyl-l-aspartates were prepared for investigating the effect of side-chain photoisomerization on their conformations. A study was made of the circular dichroism associated with the n,π* transition of the amide group, as well as the extrinsic bands associated with the azo chromophore. The intensity of the 222-nm amide band seems unaffected by the interaction with the side-chain chromophore. The circular dichroism spectra before irradiation indicate that poly[β-(m-phenylazobenzyl)-l-aspartate] (mPALA) adopts a left-handed α-helical form and the other copolymers a right-handed form in 1,2-dichloroethane. After irradiation, remarkable changes of the 222-nm band were observed for the meta copolymer with 89.3% azo residues and mPALA. The increased absolute ellipticity for the former indicates that photoisomerization enhances the helicity of the polymer. Decrease in ellipticity for the latter indicates that photoisomerization induces significant instability of the left-handed α-helical conformation. In the course of subsequent relaxation of mPALA, an abrupt change in the CD spectra was found above 50% of cis followed by a gradual change with decreasing cis%.
Selective Hydrogren Atom Abstraction by Hydrogen Atoms in Photolysis of Cyclohexane-Pentane Mixtures at 77 K
Authors: Miyazaki Tetsuo , Guedes Selma M L , Silva Leonardo G de A e , Fernandes Lizete 
Published: July 2006

Abstract
The reaction of H atoms, produced by the photolysis of HI, has been studied in c-C6H12-n-C5H12 mixtures at 77K. H atoms in c-C6H12 matrix react more effectively with solute n-C5H12 than with solvent c-C6H12, while H atoms in n-C5H12 matrix react more effectively with solute c-C6H12 than with solvent n-C5H12.
On the Mechanism of the Formation of Steroidal Cyclic Hydroxamic Acids in the Photolysis of Steroidal 17β-ol Nitrite
Authors: Suginome Hiroshi , Yonekura Norihisa , Mizuguchi Terutoshi , Masamune Tadashi 
Published: July 2006

Abstract
The Photolysis of 5α-androstane-3α, 17β-diol 3-acetate 17-nitrite (1) in benzene with monochromatic light (372±4 nm) afforded two rearranged products, 17a-aza-d-homo-5α-androstane-3α,17a-diol-17-one 3-acetate (2) and the C-13 epimer (8). This result confirmed that the cyclization of the nitroso aldehyde intermediate (C) to the two products 2 and 8 proceeds without the involvement of excited species of the nitroso aldehyde intermediate C. This conclusion differs from that obtained for bornyl and isobornyl nitrites by Kabasakalian and Townley. The results of photolysis in carbon tetrachloride are also compared with that in benzene. The photolysis of the nitrite 1 in an EPA matrix at 77 K showed that essentially no β-cleavage of the 17β-oxyl radical takes place at the temperature of liquid nitrogen.
Competitive Cyclization in the Reaction of Hexafluoropropene with 2-Aminobenzamide
Authors: Nakai Takeshi , Hassan Nabil M , Ishikawa Nobuo 
Published: July 2006

Abstract
The reaction of hexafluoropropene(HFP) with 2-aminobenzamide afforded 2-(1,2,2,2-tetrafluoroethyl)-4(3H)-quinazolinone (4) and N-(2-cyanophenyl)-2,3,3,3-tetrafluoropropionamide (5) in ca.1 : 1 ratio, which is essentially independent of the reaction temperatures ranging from room temperature to 100 °C. The formation of the two products is explained in terms of the competitive cyclization of the imidoyl fluoride intermediate, the N-6 and O-6 ring closures ultimately yielding 4 and 5, respectively. In contrast to the HFP reaction, 2-(trifluoromethyl)pentafluoropropene (OFIB) and 2-aminobenzamide gave only the O-6 cyclized product, N-(2-cyanophenyl)-2-trifluoromethyl-3,3,3-trifluoropropionamide. The difference in reactivity between HFP and OFIB is discussed.
Odor and Volatile Compounds in Liquid Swine Manure. II. Steam-distillable Substances
Authors: Yasuhara Akio , Fuwa Keiichiro 
Published: July 2006

Abstract
Many aliphatic hydrocarbons, nitrogen-containing compounds, and other substances were isolated from neutral or alkaline liquid swine manure by steam distillation and column chromatography, and identified by means of gas chromatography-mass spectrometry. Aliphatic hydrocarbons have an oily odor, and nitrogen-containing substances, particularly indole, skatole, and o-aminoacetophenone, have a strong malodor. Sulfur-containing substances which have a strong malodor have been detected in a trace quantity.
Effects of Neighboring Functional Groups in the Asymmetric Reduction of ω-Substituted Alkyl Phenyl Ketones with Lithium Tri-l-Menthoxyaluminum Hydride
Authors: Yamaguchi Shozo , Kabuto Kuninobu 
Published: July 2006

Abstract
In the enantioselective reduction of ω-substituted alkyl phenyl ketones, PhCO(CH2)nY, with lithium tri-l-menthoxyaluminum hydride, the effect of the functional groups, Y(NR2, OMe, and SMe) on the stereoselectivity was examined in comparison with that of the alkyl group. Of the functional groups tested, the MeO group is more effective in enhancing the stereoselectivity than the NMe2 or SMe group except in the case of n=1. The optical yields are also affected by the number of the methylene group (n) in the substrates. These results strongly suggest that the coordination of the Y group with the reducing reagent is one of the essential factors in the stereoselectivity. The absolute configurations of the resulting alcohols are correlated with the relative magnitudes of the lanthanideinduced shifts(LIS) of their (+)-MTPA esters.
The Silver(I) Ion-catalyzed Oxidation of Ethylenediaminetetraacetatocobaltate(II) by the Peroxodisulfate Ion
Authors: Ohashi Kousaburo , Yamamoto Katsumi 
Published: July 2006

Abstract
A spectrophotometrie study of the silver(I) ion-catalyzed oxidation of the ethylenediaminetetraacetatocobaltate(II) (CoII-edta) peroxodisulfate ion (S2O82−) was carried out in acidic media. The rate is independent of the concentration of CoII-edta, but first-order-dependent with respect to the concentrations of S2O82− and Ag(I) in the 1.67×10−2–7.25×10−2 M and 2.00×10−3–2.26×10−2 M ranges respectively.
1H and 13C NMR of 2,2′-Bipyridine Adducts with Butyltin(IV) Trichloride and Tin(IV) Tetrachloride, and Tetrabromide
Authors: Matsubayashi Gen-etsu , Iyoda Jun 
Published: July 2006

Abstract
1H and 13C NMR spectra of 2,2′-bipyridine adducts of butyltin(IV) trichloride and tin(IV) tetrachloride and -bromide have been measured in N,N-dimethylacetamide. On the basis of the chemical shifts of the 13C nucleus and spin-spin coupling constants of the 117⁄119Sn with the ligand 1H and 13C nuclei the configuration of the adducts and the nitrogen-tin coordination bond are discussed.
A New Measure of Aromatic Stabilization: Resonance Energy per π Bond (REPB)
Authors: Aihara Jun-ichi 
Published: July 2006

Abstract
A concept of resonance energy per π electron appears unsuitable for representing the aromatic stabilization of a conjugated compound. If the resonance energy is divided by the number of π bonds constituting π rings in the conjugated system, though, a reasonable index is obtained for the same purpose.
The Acid-catalyzed Reaction of Alicyclic Ketones with Formaldehyde. II. The Reaction of Cycloheptanone and Cyclooctanone with Formaldehyde
Authors: Hirano Fukumi , Wakabayashi Shoji 
Published: July 2006

Abstract
The acid-catalyzed reaction of cycloheptanone and cyclooctanone with formaldehyde gave predominantly 2,4-dioxaspiro[5.6]dodecan-7-one and 2,4-dioxaspiro[5.7]tridecan-7-one respectively.
A Convenient Preparation of Arylthioynamines
Authors: Nakai Takeshi , Tanaka Kiyoshi , Setoi Hiroyuki , Ishikawa Nobuo 
Published: July 2006

Abstract
(2,2,2-Trifluoroethylthio)benzenes prepared from sodium thiolates and 2,2,2-trifluoroethyl p-toluenesulfonate reacted with 3 equiv of lithium dialkylamides in diethyl ether to give arylthioynamines in good yields. The present procedure gives good results with aliphatic sulflde.
Chemical Synthesis of Antigenic Determinants of Hen Egg-White Lysozyme. II. Tetradecapeptide Corresponding to Positions 1–14 in the Primary Structure but with Ala6 and Met(O)12
Authors: Kumagae Shin-ichiro , Shimonishi Yasutsugu 
Published: July 2006

Abstract
For characterizing one of the antigenic determinants of hen egg-white lysozyme in delayed hypersensitivity, the tetradecapaptide, H–Lys–Val–Phe–Gly–Arg–Ala–Glu–Leu–Ala–Ala–Ala–Met(O)–Lys-Arg–OH, was synthesized by the solid phase method using ultrasonic waves. This peptide corresponds to positions 1–14 of the amino acid sequence of hen egg-white lysozyme but with alanine and methionine S-oxide residues at positions 6 and 12, respectively.
A Phenomenological Description of Electron Paramagnetic Double-Resonance Relaxation of Organic Free Radicals in Solution. II. ENDOR Relaxation of Galvinoxyl
Authors: Shikata Hideo , Ishizu Kazuhiko 
Published: July 2006

Abstract
The ratio of the ENDOR enhancement to the ESR intensity (E) of galvinoxyl in toluene was measured under various conditions of microwave power, rf power and temperature. The results are discussed in comparison with a phenomenological theory in part I. It is proven that the apparent longitudinal electron spin relaxation time for a t-butyl proton under NMR excitation is about twice as long as those for methylidyne and ring protons, which is explained by the effect of incomplete hf separation. Also, it is shown that the reciprocal of the slope of the plot of E−1 vs. (rf power)−1 for methylidyne and ring protons is approximately proportional to the number of equivalent protons, whereas that for a t-butyl proton can be explained only if the effect of incomplete hf separation is taken into consideration. The value of b=Wn⁄We for methylidyne and ring protons, simulated from the temperature dependence of E based on a previous theory, can be closely correlated to the spin distribution in galvinoxyl.
Studies on Mixed Chelates. VIII. Mixed Copper(II) Chelates with N,N′- and N,N-Dialkylethylenediamines and Acetylacetone
Authors: Fukuda Yutaka , Okamura Hiroko , Sone Kozo 
Published: July 2006

Abstract
Mixed chelates [Cu(diamine)(acac)]X(diamine: N,N′- and N,N-dialkylethylenediamines) were studied. Two such chelates with diethyl ligands were obtained in crystalline state, while the formation of chelate cations [Cu(diamine)(acac)]+ in 80% dioxane was studied with dimethyl ligands, and their formation constants estimated. The importance of steric effect in the bis-diamine chelates on the ease of formation of this type of chelate was pointed out.
Nuclear Quadrupole Resonances of AlBr3·SbBr3, AlI3·SbI3, and AlBr3·BiBr3
Authors: Okuda Tsutomu , Yamada Koji , Ishihara Hideta , Negita Hisao 
Published: July 2006

Abstract
The quadrupole coupling constants (e2Qq⁄h) and the principal axes of electric field gradient (efg) at 81Br, 127I, 27Al, 121Sb, and 209Bi in AlBr3·SbBr3, AlI3·SbI3, and AlBr3·BiBr3 were determined by means of NQR or NMR, in order to clarify the structures and chemical bonds of these compounds. The NQR spectra of AlBr3·SbBr3 and AlI3·SbI3 resemble each other and these two compounds consist of V-shaped SbX2+ and distorted tetrahedral AlX4− ions (X=Br and I). However, there are weak bonds between the Sb atom in SbX2+ and the halogens in AlX4− ion. The V-shaped SbX2+ has the bond angle 97.3° for the bromide and 99.0° for the iodide. The orientation of the efg axes at the 121Sb atom suggests that the antimony atom has a lone pair of electrons in the opposite direction to the bisector of the two Sb–X bonds. On the other hand, only one terminal bromine atom bonded to the Bi atom was found for AlBr3·BiBr3.
Polarized Absorption Spectra and Configuration Analyses of Xanthene and Xanthone
Authors: Minegishi Tsuneyuki , Hoshi Toshihiko , Hiratsuka Hiroshi , Tanizaki Yoshie 
Published: July 2006

Abstract
The polarized absorption sepctra of xanthene and xanthone were measured in stretched poly (vinyl alcohol) films, and the polarization direction of each electronic transition was determined. It was confirmed that xanthone has the short molecular-axis polarized bands (1A1←1A1) at 343, 260, and 226 nm, and the long molecular-axis polarized ones (1BA2←1A1) at 290, 266, and 242 nm. The electronic transitions of xanthone are discussed in connection with those of xanthene by use of the configuration analysis. For the 266 and 260 nm bands, the contributions of the intramolecular charge transfer character from the xanthene skeleton to the carbonyl group are considerable.
Crystal and Molecular Structure of α-Form of 2,4,6-Trimethyl-1,3,5-trithiane
Authors: Sekido Kiyotane , Ono Haruaki , Noguchi Teruo , Hirokawa Sakutaro 
Published: July 2006

Abstract
The crystal structure of α-form of 2,4,6-trimethyl-1,3,5-trithiane (α-TTA) has been determined by the X-ray method. The crystal data are a=9.768, b=12.306, c=8.521 Å, and β=116.33 °. The space group is Cc with four molecules in a unit cell. The structure was deduced from interpretation of the 3D-Patterson series, and refined by 3D-Fourier and least-squares method to the final R factor of 0.040 for 1371 reflections. The molecule has a six-membered ring where three sulfur atoms and three carbon atoms are linked alternatively, forming a chairform. Two methyl groups are in the equatorial positions and one methyl group in the axial. The mean values of the bond distances are 1.818 Å for S–C and 1.519 Å for C–Ceq. The distance is 1.541 Å for C–Cax. The mean values of the bond angles are 101.89° for C–S–C, 107.60° for S–C–Ceq, 113.25° for S–C–Cax, and 112.92° for S–C–S.
Solid-State Anodic Oxidation of Aluminum with Organic-Conductor Counterelectrode
Authors: Yoshimura Susumu , Murakami Mutsuaki 
Published: July 2006

Abstract
Solid-state anodic oxidation of aluminum contacted to a pellet of various organic conductors based on 7,7,8,8-tetracyanoquinodimethane was observed. A typical passivation curve was observed in the current-voltage characteristics for the anodic polarization of the metal. Along with impedance measurements on the electrode system, it was proved that the passivation is due partly to a thermal transformation in the organic conductor and partly to a solid-state anodization of aluminum, the latter being conditioned by the former through the formation of an electrolyte layer in situ. The current efficiency of anodization was estimated by a linear voltage sweep method to be as high as 2%, depending on the ambient moisture. The high efficiency explains the prominent self-healing action of a new type of solid electrolytic capacitor in which manganese dioxide is replaced by an organic-conductor counterelectrode.
NMR Study of Spontaneous Degradation of Penicillin G in Aqueous Solution
Authors: Mitsumori Fumiyuki , Arata Yoji , Fujiwara Shizuo , Muranaka Masaharu , Horiuchi Yoshihiko 
Published: July 2006

Abstract
The spontaneous degradation of penicillin G in aqueous solution has been studied using NMR and thin layer chromatography. Correlation NMR spectroscopy was used to follow products which appear at the early stage of degradation. It has been found that in 0.3 M phosphate buffer (pH 7.0, 30 °C) a successive first order degradation
penicillin G \xrightarrowk1 penicilloic acid \xrightarrowk2 secondary product
is dominant with kinetic constants of k1=0.7×10−2 h−1 and k2=6×10−2 h−1.
The Crystal Structures of Tin(II) Chloride Dihydrate in High- and Low-Temperature Phases as Studied by Neutron and X-Ray Diffractions
Authors: Kitahama Katsuki , Kiriyama Hideko 
Published: July 2006

Abstract
The neutron-diffraction results for deuterated single crystals have shown definitely that the phase transition is ascribable to the ordering of the hydrogen atoms. The ordered arrangement below the transition temperature (Tt=234 K) agrees well with the NMR results. No doubling of the unit cell or loss of the center of symmetry can be detected. In the disordered phase above Tt, four deuterons of two non-equivalent water molecules are distributed into seven sites. The occupancy factors of the individual sites have been refined by least-squares methods under different constraints. Bernal and Fowler’s ice rule is obeyed in the H-bonded water layers, and the water molecules of crystallization scarcely dissociate at all. The crystal structure has been redetermined by the X-ray diffraction method at 209 and 223 K, using an SnCl2·2H2O single crystal. No distinct change in the structure of non-hydrogen atoms has been disclosed on passing through the transition point (Tt=218 K). However, in the close vicinity of Tt, the a and c lattice parameters and the three H-bonded O···O distances steeply change in association with the ordering of the hydrogen atoms.
Infrared and Mossbauer Spectra of Synthetic Garnets A3Fe2Si3O12 (A: Mn, Cd, Ca)
Authors: Nishizawa Hitoshi , Shimada Masahiko , Matsuoka Kiyoshi , Koizumi Mitsue 
Published: July 2006

Abstract
The garnet Mn3Fe2Si3O12 with a0=11.821 Å was synthesized at high pressure and temperature. Infrared and Mossbauer spectra of the synthetic garnets A3Fe2Si3O12 (A: Mn, Cd, Ca) suggest that the distortion of SiO4 tetrahedra in these garnets increases and that of FeO6 octahedra decreases with increase in the radius of eight fold coordinated cation.
Studies of Electrode Processes of Oxovanadium (IV). IV. Catalytic Reduction of Acetylacetone Coupled with Cathodic Reduction of Bis(acetylacetonato)oxovanadium(IV)
Authors: Kitamura Mitsutaka , Sasaki Kazuo , Imai Hideo 
Published: July 2006

Abstract
Acetylacetone was catalytically reduced in the course of the electrolytic reduction of bis(acetylacetonato)oxovanadium(IV) at a mercury cathode. In acetonitrile solutions the catalytic reduction proceeded at −2.1 V vs. Ag/0.01 mol dm−3 AgClO4 electrode and the reduction products were hydrogen and acetylacetonate anion, while by the direct electrolysis of acetylacetone at −2.5 V a product with vicinal hydroxyl groups was formed. A steady-state current was observed in the controlled potential electrolysis. A reaction mechanism involving the regeneration of trivalent vanadium by the coupled chemical reaction of divalent vanadium with acetylacetone is proposed.
A Spectrophotometric Study of Phosphomolybdenum Blue Formed by the Reaction of Phosphate with a Mixture of Molybdenum(V) (Mo2O42+) and Molybdenum(VI) and Application to the Spectrophotometric Determination of Small Amounts of Phosphates
Authors: Ohashi Kousaburo , Yasu Kumiko , Suzuki Choutaro , Yamamoto Katsumi 
Published: July 2006

Abstract
The spectrophotometric determination of trace amounts of phosphates, based on the color development of phosphomolybdenum blue formed by the reaction of phosphate with a mixture of molybdenum(V) (Mo2O42+) and molybdenum(VI), is described. The rates of formation of phosphomolybdenum blue were measured at 25°C in a perchloric acid medium. The maximum constant color development was obtained in the perchloricacid range from 0.20 to 0.41 M under given conditions by warming the solution for 10 min at 80°C. The method obeys Beer’s law in the phosphate-concentration range from 0.08 to 1.16 μg/ml. The molar absorptivity at 840 nm was calculated to be 2.4×104 1 mol−1 cm−1. The rate is inverse fifth-order with respect to the perchloric-acid concentration in the range from 0.20 to 0.41 M and is first-order with respect to the molybdenum(V) concentration. The formation rates increase with the phosphate and molybdenum(VI) concentrations, although the rate dependence on the concentrations of these reactants is complicated. The ratio of P: Mo(V) for phosphomolybdenum blue was determined to be 1 : 1 using the molar-ratio method.
Catalytic Decomposition of the Excess Reagent in the Spectrophotometric Determination of Copper(II) with o,o′-Dihydroxyazo Compounds
Authors: Sugawara Masao , Rokugawa Yuh’ichi , Kambara Tomihito 
Published: July 2006

Abstract
A simple and sensitive spectrophotometric method for determination of copper(II) is described. It is based on the reaction of copper(II) with Hydroxynaphthol Blue in the weakly alkaline medium and the decomposition of the unconsumed reagent which shows an intense absorption at the wavelength, 555 nm, of the maximum absorbance of the copper(II) complex. Beer’s law is obeyed over the range 0.13–1.27 ppm copper with the molar absorption coefficient of ε555=3.01×104 dm3 mol−1 cm−1 (Sandell’s sensitivity 2.11×10−3 μg/cm2). A fairly large number of common ions except for nickel(II) do not interfere.