bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Formation of the N-bound Hydroxyiminoacetylacetonato Ligand by the Reaction of Nitrosyl in Bis(2,2′-bipyridine)chloronitrosylruthenium(II) with Acetylacetone
Authors: Mukaida Masao , Yoneda Masakazu , Nomura Terunosuke 
Published: July 2006

Abstract
Nitrosyl in [RuCl(bpy)2NO]2+ reacts with Hacac, giving the N-bound hydroxyiminoacetylacetonato ligand(hia, CH3COC(NO)COCH3−) under mild conditions. The reaction product, [Ru(hia)(bpy)2(H2O)]X (X=ClO4, PF6), was characterized on the basis of its IR spectra, including those of the 15N-complex.
The Photochemical Sulfenylation of Hindered Phenols with Diaryl Disulfides
Authors: Fujisawa Tamotsu , Kojima Takakazu 
Published: July 2006

Abstract
The photochemical reaction of diaryl disulfides with 2,6-disubstituted phenols was investigated. The reaction with highly hindered phenols proceeded appreciably upon irradiation with a high-pressure mercury lamp, giving rise to 4-arylthio-2,6-disubstituted phenols. The reaction was initiated by the homolytic scission of the disulfides.
A Simple Method for the Synthesis of 5-Methyloxazolo[4,5-c]quinolin-4(5H)-ones
Authors: Merchant J R , Shirali S S 
Published: July 2006

Abstract
A general and simple method for the synthesis of oxazolo[4,5-c]quinoline-4(5H)-ones by heating 3-amino-4-hydroxy-2-quinolone hydrochloride with aromatic acids in the presence of PPA has been described. The structures are based on spectral and analytical data.
Oxidation of Biphenylene with Ammonium Cerium(IV) Nitrate. A Convenient Route to Biphenylene-2,3-dione
Authors: Sato Masaru , Fujino Harutoshi , Ebine Seiji , Tsunetsugu Josuke 
Published: July 2006

Abstract
Biphenylene was directly oxidized with ammonium cerium(IV) nitrate to give biphenylene-2,3-dione in moderate yield, along with 2-nitrobiphenylene and 3-nitro-biphenylen-2-ol.
Interactions of Calcium Ions with Carbohydrates: X-Ray Diffraction and NMR Spectroscopic Studies on the Potassium Salt and the Calcium Salt of d-Clucaric Acid
Authors: Taga Tooru , Kuroda Yoshihiro , Osaki Kenji 
Published: July 2006

Abstract
The crystal structure of potassium d-glucarate was determined by X-ray analysis. The conformation of the glucaric anion in the potassium salt differs from that of the dianion in the crystal of the calcium salt. The proton magnetic resonance spectra of the solutions of the potassium salt and the calcium salt show that the glucarate solution is an equilibrium mixture of the two conformers observed in the crystals. Studies on the induced shifts by adding europium nitrate to the acidic solution indicate that the europium ions are selectively bound to the potassium type conformer. Calcium sequestant by the glucaric acid in alkaline solutions should occur when calcium ions bind the calcium type conformers in a dianionic state.
Synthesis of New Heptacyclic Propellanes
Authors: Tobe Yoshito , Omura Hirofumi , Kunai Atsutaka , Kimura Koji , Odaira Yoshinobu 
Published: July 2006

Abstract
The heptacyclic propellanes, 8 and 9, having two propellane rings in each molecule, were synthesized by the stepwise photocycloaddition of bicyclo[4.3.0]non-1(6)-en-7-one (1) to cyclohexadiene or cyclooctadiene followed by the Wolff-Kishner reduction of the resulting propellanones 6 and 7. The photosolvolytic behavior of some of the cycloadducts is also described.
Four Isomers of the Bis(ethylenediamine)sarcosinatocobalt(III) Ion: Separation, Identification, and Characterization
Authors: Fujita Miho , Yoshikawa Yuzo , Yamatera Hideo 
Published: July 2006

Abstract
All four possible isomers of the bis(ethylenediamine)sarcosinatocobalt(III) ion, [Co(sar) (en)2]2+, were separated chromatographically on the column of an SP-Sephadex cation exchanger, and their absorption, circular dichroism, and 13C NMR spectra were measured. The more stable pair of isomers were identified as Δ-[Co(S-sar) (en)2]2+ and Λ-[Co(R-sar) (en)2]2+, while the less stable pair were Δ-[Co(R-sar) (en)2]2+ and Λ-[Co(S-sar) (en)2]2+. The Δ-[Co(S-sar) (en)2]2+ isomer in an aqueous solution showed mutarotation which can be ascribed to a change in configuration (epimerization) about the sarcosinato nitrogen atom. In equiribrium at 25°C, the mixture consisted of 84.8% of the Δ(S) isomer and 15.2% of the Δ(R) isomer. From this result, the free-energy difference between the isomers was estimated to be 4.26 kJ mol−1. The presence of the less stable isomers, which were not found by Buckingham et al., was also confirmed by the 13C NMR measurements.
Photochemical Ethoxycarbonylmethylation of Toluene with Ethyl Chloroacetate
Authors: Ogata Yoshiro , Hayashi Eiji 
Published: July 2006

Abstract
UV irradiation of a toluene solution of ethyl chloroacetate under N2 gave an isomeric mixture of ethyl tolylacetates: ortho, 5.2%, meta, 9.6%, para, 0.9% and a trace of diethyl succinate. The reaction under air increased the yields of all the products. Addition of AlCl3 also increased the yields, especially that of ortho; i. e.; 17.9%; meta, 26.5%; para, 10.6%.
Solvent Effects upon Dynamic Behavior of Intramolecular Heteroexcimers
Authors: Okada Tadashi , Saito Takashi , Mataga Noboru , Sakata Yoshiteru , Misumi Soichi 
Published: July 2006

Abstract
Solvent effects upon fluorescence quantum yields, fluorescence rise and/or decay curves of p-(CH3)2NC6H4–(CH2)n–(9-anthryl) (n=1, 2, 3) and p-(CH3)2NC6H4–(CH2)n–(1-pyrenyl) (n=1, 2, 3) have been investigated in detail. It is concluded that the sandwich structure is not necessary for the intramolecular charge transfer in polar solvents and that the mechanism of intramolecular heteroexcimer formation in polar solvents is different from that in nonpolar solvents.
The Structure and Reactions of Imidoyl Triphenylphosphonium Methylides
Authors: Yoshida Hiroshi , Ogata Tsuyoshi , Inokawa Saburo 
Published: July 2006

Abstract
Twenty-five imidoyl triphenylphosphonium methylides III were prepared from triphenylphosphonium methylide and imidoyl chlorides or imidates in moderate yields. The configration of these ylides was assigned on the basis of NMR spectroscopic studies. N-Tosyl substituted ylides showed no reactivity toward aldehydes, whereas N-aryl substituted ylides could be converted easily into α,β-unsaturated ketimines in good yields. The reaction of III with carbon disulfide was also studied.
The Components of Petasites japonicus Maxim. IV. The Structure of Petasitin
Authors: Takagi Ichiro , Tazuke Yasuhito , Naya Keizo 
Published: July 2006

Abstract
Petasitin, a component isolated from a wild variety of Petasites japonicus Maxim., has been shown to be 3α-[(Z)-2-methyl-2-butenoyloxy]-11-hydroxyeremophila-6,9-dien-8-one, and has been synthesized from the known isopetasin by photosensitized oxygenation.
Substituent Effects in the Diels-Alder Reaction of Substituted Benzynes with Hexamethylcyclohexa-2,4-dienone
Authors: Oku Akira , Matsui Akira 
Published: July 2006

Abstract
The Diels-Alder reaction of unsymmetrically substituted benzynes that had been generated from 3-Me-, 4-Me-, 5-Me-, 6-Me-, 3,4-Me2-, 3-NO2-, 4-NO2-, 5-NO2-, and 3-Cl-benzenediazonium-2-carboxylates, with hexa-methylcyclohexa-2,4-dienone gave a mixture of 5- or 6-substituted-1,2,3,4,10,10-hexamethyl-1,4-dihydro-1,4-. ethanonaphthalene-9-one (Type 7) and its 8- or 7-substituted isomer (Type 8). The 7/8 isomer ratios varied from 1.0 to 2.0 depending substantially on the size and the position of substituents of the benzynes and also on the temperature and the solvent. The ratios were the same when two positionally isomeric acids, i.e., 3- and 6-, or 4- and 5-substituted acids, were used as the precursors. Thus, the identity of the benzynes generated from these paired isomeric precursors was proved, ruling out the possibility of an inherent memory effect of the precursors. The factor that controls the isomer ratios is discussed in terms of the steric repulsive interaction between the substituents of benzynes and the gem-dimethyl groups of the dienone.
Backbone Rearrangement of 3β,4β-Epoxyfriedelane. A Formation of Germanicol and Solvent Effects
Authors: Tori Motoo , Tsuyuki Takahiko , Takahashi Takeyoshi 
Published: July 2006

Abstract
In the reaction of 3β,4β-epoxyfriedelane with boron trifluoride etherate in benzene, a backbone rearragement proceeds up to D/E rings, giving germanicol as the main product, together with D:B-friedo-olean-5(10)-en-3β-ol, D:B-friedo-olean-5-en-3β-ol, and β-amyrin. The reaction product ratio of this reaction in various solvents was examined by HPLC.
Photo-induced Electricity Generated by Thin-layer Photogalvanic Cells Containing Thionine and Iron(II) Salt
Authors: Shigehara Kiyotaka , Nishimura Masatoshi , Tsuchida Eishun 
Published: July 2006

Abstract
The photogalvanic effects of thionine and Fe(II) salt systems were studied by use of thin-layer photocells. Three systems of the cell components, i.e., SnO2/thionine–Fe(II) aq/Pt, SnO2/thionine–Fe(II)-gelatinized reagent/Pt, and SnO2/polymeric thionine membrane–Fe(II)/Pt, were compared. The photopotential ΔE and the photocurrent I were the largest in the third system. It was concluded that the excellent ability of the polymeric thionine system to generate the photo-induced electricity is due to the strong electrostatic repulsion between Fe3+ and the semi-species bound to the cationic polymers, since the repulsion diminished the short-circuit in a solution or the bulk-backward reaction with Fe3+. The electron-recycling in a solution took place not only through the transportation of Fe3+ to the cathode, but also through the electron-exchange reaction between Fe2+ and Fe3+ via hydrogen bonds.
The Preparation of Trivalent Metal Chelates with Some N3O3-Type Ligands
Authors: Takahashi Mariko , Takamoto Susumu 
Published: July 2006

Abstract
Iron(III), chromium(III), and cobalt(III) chelates with 1,4,7-triazacyclononane-N,N′,N″-triacetate, 1,4,7-triazacyclodecane-N,N′,N″-triacetate, and 2-(aminomethyl)-2-methyl-1,3-propanediamine-N,N′,N″-triacetate were synthesized and characterized by means of the electronic absorption spectra in an aqueous solution. As they are noncharged chelates with a C3 symmetry, their spectra resemble those of facial tris(glycinato) complexes.
The Formation and Extraction Equilibria of Several Manganese(II) β-Diketonates and Their Trioctyl-Phosphine Oxide Adducts
Authors: Sekine Tatsuya , Murai Ryokichi , Takahashi Kazuhiko , Iwahori Shigehisa 
Published: July 2006

Abstract
From the distribution ratio of manganese(II) between carbon tetrachloride containing various amounts of β-diketone (HA) and trioctylphosphine oxide (TOPO), and an aqueous 1 mol dm−3 perchlorate solution at 25 °C, the formation constants for the aqueous chelates and the TOPO adducts of the MnA2, and the partition constants for the MnA2 chelates were determined. The constants were then compared with those of other divalent metal ions.
Electronic Structures and Spectra of Azulenophenalenes
Authors: Koyanagi Tsuguo , Shin Yuko , Yamaguchi Hiroyuki 
Published: July 2006

Abstract
The ground-state electronic properties and electronic spectra of azuleno [5, 6, 7-cd]phenalene (I) and azuleno[1, 2, 3-cd]phenalene (II), which are isomers of the potent carcinogen benzo[a]pyrene (III), have been investigated by using the SCF screened potential MO CI method in combination with the variable bond-length technique. From the calculated C–C bond lengths and the position dependence of the SCF screened potential, it may be concluded that molecules I, II, and III are all both aromatic and polyolefinic. The electronic spectra of I, II, and III predicted using the screened potential are in better agreement with the experimental values than those calculated using the bare potential.
A Potentiometric Study on Complex Formation of Cadmium(II) and Lead(II) Ions with Ethylenediaminetetraacetic Acid
Authors: Oyama Noboru , Matsuda Hiroaki , Ohtaki Hitoshi 
Published: July 2006

Abstract
The complex formation of cadmium(II) and lead(II) ions with ethylenediaminetetraacetic acid (EDTA) has been studied potentiometrically in a 1.0 M NaClO4 medium at 25.0 °C by using glass and metal–amalgam electrodes. The results were explained in terms of the formation of the complexes of MHqL with q=3, 2, 1, and 0 for both metals. The corresponding formation constants were determined: for the Cd–EDTA system, logβ101=14.25±0.02, logβ111=17.41±0.02, logβ121=19.71±0.02 and logβ131=21.35±0.02; for the Pb–EDTA system, logβ101=16.50±0.05, logβ111=19.78±0.02, logβ121=21.35±0.02 and logβ131=22.50±0.02, where βpqr=[MpHqLr(2p+q−4r)+]/[M2+]p[H+]q[L4−]r and L denotes the unprotonated molecule of EDTA. The protonation constants of unprotonated EDTA were found to be logβ011=8.63±0.02, logβ021=14.99±0.02, logβ031=17.63±0.02, logβ041=19.87±0.02, logβ051=21.54±0.02, and logβ61=22.70±0.02.
Reactions of the Cation Radicals of Aromatic Diamines with Their Parent Molecules or Aliphatic Amines
Authors: Sakata Tadayoshi , Hiromoto Mitsuo , Yamagoshi Tomoko , Tsubomura Hiroshi 
Published: July 2006

Abstract
The chemical reactions of the cation radicals of some aromatic diamines with their parent molecules, aliphatic amines or sodium hydroxide have been studied spectroscopically. In the case of the cation radical of p-phenylenediamine (PPD), the main products are Bandrowski’s base (BB) and PPD, p-benzoquinone diimine being found as an intermediate. This reaction are found essentially to be a disproportionation of PPD+ to BB and PPD in which bases added enhance the reaction rate. The thermodynamical quantities of the initial step of the reaction, proton transfer from PPD+, are estimated and the reaction mechanism is discussed. The reaction of the cation radical of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) with triethylamine (TEA) gives the parent molecule, TMPD. This reaction is concluded to be caused by an electron transfer from TEA to TMPD+ followed by a reaction of TEA with a large negative free energy change. The reaction between the cation radical of N,N-dimethyl-p-phenylenediamine and its parent molecule has also been studied.
Mechanism of the Chemiluminescence of Lucigenin. II. The Charge-transfer Structure of Lucigenin and Reduction of 10,10′-Dimethyl-9,9′-biacridinium Dication by Electron Transfer from Nucleophiles
Authors: Maeda Koko , Kashiwabara Toshi , Tokuyama Mizue 
Published: July 2006

Abstract
Lucigenin (10,10′-dimethyl-9,9′-biacridinium dinitrate, DBA2+2NO3−) was found to be a CT complex between DBA2+ and NO3−. In the reaction of lucigenin with several nucleophiles in the absence of molecular oxygen or oxidizing agents the following four types of products were obtained, depending upon the relative power of the nucleophiles to donate electrons to DBA2+: (1) salts of DBA2+ (DBA2+2X−) which are the CT complex between DBA2+ and the nucleophiles, such as Cl−, Br−, SCN−, and I−, (2) the cation radical DBA\underset.+ produced by one-electron transfer from nucleophiles, such as C6H5COCH2− and CH3COCH2−, to DBA2+, (3) the biradical DBA\underset.2 produced by two-electron transfer from nucleophiles such as OH−, CN−, CCl3−, and C6H5S− and (4) 10,10′-dimethyl-9,9′-bi(dihydroacridinylidene) produced from DBA\underset.2. Only the nucleophiles of (3), which produced DBA\underset.2 brought about the luminescence of lucigenin in the presence of oxygen, and DBA\underset.2 also showed luminescence in organic solvents in the presence of oxygen. From these findings it was concluded that the first process of the chemiluminescent reaction of lucigenin was the electron transfer reduction of DBA2+ by the nucleophiles to form the biradical DBA\underset.2.
A Synthesis of 3′-Deoxybutirosin B
Authors: Watanabe Isamu , Ejima Akio , Tsuchiya Tsutomu , Ikeda Daishiro , Umezawa Sumio 
Published: July 2006

Abstract
3′-Deoxybutirosin B (13) was prepared from 3′-deoxyparomamine (1), d-ribose and (S)-4-amino-2-hydroxybutyric acid (AHBA). The synthesis involves replacement of the 6′-hydroxyl group of 3′-deoxyparomamine with azido group, 1,6-carbamate ring formation, condensation with tri-O-(p-nitrobenzovl)-α,β-d-ribofuranosyl bromide, selective cleavage of the carbamate ring, and acylation of the free amino group at C-1 with AHBA.
Absorption Spectra of Bis(sulfito) and Bis(thiosulfato) Complexes of Cobalt(III)
Authors: Akamatsu Keiji , Hidaka Jinsai , Shimura Yoichi 
Published: July 2006

Abstract
It has been shown that the near ultraviolet “specific band” of a trans isomer of bis(sulfito) or bis(thiosulfato) cobalt(III) complexes is more bathochromic than the corresponding cis isomer. The cis-[Co(SO3)2(en)2]− complex was optically resolved and its circular dichroism spectrum reported.
Pseudohalogen Chemistry. V. Homolytic Addition of Thiocyanogen Chloride to Some Haloalkenes on Irradiation with UV Light
Authors: Guy Robert G , Pearson Ian 
Published: July 2006

Abstract
When irradiated with UV light, thiocyanogen chloride reacts with haloalkenes containing 1–4 halo substituents yielding α-chloro-β-thiocyanato compounds. Addition to unsymmetrical alkenes is regioselectively antiMarkownikov. A radical-chain mechanism, involving SH2 displacement on the sulfur atom of thiocyanogen chloride and chlorine atoms as the adding/chain-carrying species, is proposed.
Ullmann Condensation Reaction of Haloanthraquinone Derivatives with Amines in Aprotic Solvents
Authors: Arai Sadao , Yamagishi Takamichi , Ototake Satoshi , Hida Mitsuhiko 
Published: July 2006

Abstract
Cuprous catalysts were more effective than cupric ones in the Ullmann condensation of haloanthraquinones with amines in aprotic media. In the presence of Cu(I) catalyst, amines with a hydroxyl group (3-amino-1-propanol and 2-aminoethanol) were more reactive than the higher basic butylamine.
Magnetic Circular Dichroism of the Thulium and Erbium Ethyl Sulfate Nonahydrate Crystals
Authors: Kato Yoshifumi , Nakaya Toshikazu , Nagai Toshiyuki 
Published: July 2006

Abstract
The magnetic circular dichroism and absorption spectra of the thulium and erbium ethyl sulfate nonahydrate crystals have been measured at low temperatures, down to 18 K. The analyses are made for five absorption bands of Tm(C2H5SO4)3·9H2O; the bands from the ground state, 3H6, to the excited states 3F3, 3F2, 1G4,1D2, and 3P1 of Tm3+, and for four bands of Er(C2H5SO4)3·9H2O; the bands from the ground state, 4I15⁄2, to the excited states 4S3⁄2, 4F5⁄2, 4F3⁄2, and 2G9⁄2 of Er3+. With the aid of the information about energy levels already obtained, the g values of the crystal levels relevant to absorptions are derived from the Faraday parameters; these are in good agreement with those obtained by other methods.
A Semi-empirical NDDO Method for All-valence-electron Systems. I. Hydrocarbons
Authors: Kikuchi Osamu 
Published: July 2006

Abstract
A semi-empirical NDDO method is applied to the evaluation of the molecular geometries and excitation energies of a variety of hydrocarbons, both saturated and conjugated, and of the heats of reactions among these hydrocarbons. Two-center electron repulsion integrals are evaluated by the simple formulae derived from the corresponding theoretical formulae. The off-diagonal core matrix elements and core-core repulsion energies are estimated empirically. It is shown that the method gives good estimates of the molecular geometries and excitation energies and permissible values for the heats of reactions.
The Infrared Band Shapes of Methyl Iodide in Solutions
Authors: Ikawa Shun-ichi , Fukushi Kohji , Fujiwara Kenji , Kimura Masao 
Published: July 2006

Abstract
The infrared band shapes of methyl iodide in solutions were simulated by the superposition of the Lorentzian functions. The a1-type band was well repoduced by a single Lorentzian function. Its half-width was reasonably explained by the reorientational and vibrational relaxations. The e-type band was reproduced by two Lorentzian functions; one represents the central main peak of the band, while the other is much broader and appears like a background. The half-width of the former was nearly proportional to the Q-branch line spacing in the gas spectrum, while that of the latter seems to be related to the A1-E-type Coriolis coupling.
The Effect of the Deuterium Substituent on the Anomalous Phase Transition of the Crystalline Galvinoxyl Radical
Authors: Mukai Kazuo , Mishina Tadashi , Ishizu Kazuhiko , Deguchi Yasuo 
Published: July 2006

Abstract
Two kinds of deuterium substituents of the galvinoxyl radical have been synthesized, and the effect of the deuterium substitution on the anomalous phase transition of the crystalline galvinoxyl radical at 82 K has been studied. The results, investigated by means of ESR and magnetic susceptibility measurements, indicate that the effect was not strong enough to induce any observable change in the transition.
Photochemical Study of the Alkylammonium Molybdates. III. Preparation and Properties
Authors: Yamase Toshihiro , Ikawa Tsuneo 
Published: July 2006

Abstract
Six alkylammonium molybdates which we have prepared were examined for photochemical and photochromic properties in a solid and in an aqueous solution. The white crystals were reddish brown or violet when irradiated with UV light. Five compounds of the six were photochromic under aerobic conditions. The thermal return to the white color was slow, taking several hours at room temperature. The irradiation of the aqueous solution (pH 4.3–6.5) by UV light caused a blue coloration; the quantum yield increased with an increase in the molybdate concentration. A UV-induced coloration in both solid and solution was ascribable to the photoreduction of Mo(VI) to Mo(V). The blue form in the aqueous solution possesses several unique characteristics, including: (1) g=1.926 and a=52 G in its ESR spectrum; (2) the oxidation of Mo(V) to Mo(VI) upon exposure to oxygen, with an accompanying bleaching, and (3) thermochromism (blue form\leftrightarrowsgreenish yellow form) with ΔHr≈15 kcal/mol.
Hydrocracking of Tetralin on Supported Nickel–Tungsten Catalysts
Authors: Yamadaya Shoko , Oba Masaaki , Miki Yasuo 
Published: July 2006

Abstract
The hydrocracking of tetralin was carried out over supported nickel–tungsten (NiO 3%, WO3 20%) on silica–alumina, alumina, and silica catalysts at a hydrogen pressure of 100 atm and in the temperature range from 325 to 375 °C. The total conversion of tetralin and the product composition of hydrocracking were measured for the catalysts. The influence of pretreatment of the catalysts with H2 and H2S on the conversion and product composition was investigated for each catalyst. The hydrocracking of decalin was also carried out under the same conditions. It is found that the hydrocracking of tetralin proceeds along two reaction paths: (A) hydrogenation to decalin followed by conversion to methylperhydroindenes and C10-naphthenes, (B) isomerization to methylindans followed by cracking to butylbenzene. The selectivity of each reaction path and the catalytic properties are discussed.
Molar Excess Enthalpies of α,ω-Alkanediol Monoalkyl Ether+Heptane Systems at 298 K
Authors: Kimura Fumio , Murakami Sachio , Fujishiro Ryoichi , Toshiyasu Yoshio 
Published: July 2006

Abstract
Enthalpies of mixing of some α,ω-alkanediol monoalkyl ether(ADAE)+heptane systems were measured at 298 K, and limiting partial molar excess enthalpies of ADAE at infinite dilution, x→0lim HE⁄x(1−x), were estimated. The ADAE used were CH3O(CH2)nOH (n=2, 3, 4), C2H5O(CH2)nOH (n=2, 3), C3H7O(CH2)nOH (n=2, 3), and C4H9O(CH2)2OH. The values of x→0lim HE⁄x(1−x), obtained were compared with those of normal alcohols, and discussed in the light of the intramolecular hydrogen bond contained in ADAE. The enthalpic contribution due to the intramolecular hydrogen bond in ADAE is estimated to be about 10 kJ mol−1.