bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mono(cyclopentadienyl)titanium(IV) Derivatives with Heterocydic Thioketones
Authors: Pandey Om Prakash , Sengupta Soumitra Kumar , Tripathi Satish Chandra 
Published: July 2006

Abstract
The reactions of mono(cyclopentadienyl)titanium(IV) trichloride with three important series of heterocyclic thioketones, viz., triazolinethiones 4-amino-, 4-benzylideneamino-, 4-furfurylideneamino-, and 4-salicylideneamino-5-trifluoromethyl-1,2,4-triazoline-3-thiones, thioxoquinazolones (3-methyl-, 3-phenyl-, and 3-(o-tolyl)-2-thioxo-4-quinazolones), and oxadiazolethiones (5-phenyl-, 5-(p-nitrophenyl), and 5-(p-chlorophenyl)-1,3,4-oxadiazole-2-thiones, have been studied in anhydrous dichloromethane. The reaction products have been characterized on the basis of elemental analyses, electrical conductance, magnetic susceptibility and spectral (electronic, infrared, and 1H NMR) data. Proton NMR spectra indicate that there is rapid rotation of the cyclopentadienyl ring around the metal ring axis on the NMR time scale at 28 °C.
Spectroscopic Studies of Photochemical Reactions in Organic Solids. Photodimerization of p-Formylcinnamic Acid
Authors: Ghosh Urmi , Misra Tridibendra Narayan 
Published: July 2006

Abstract
Raman phonon spectroscopy and electronic absorption and emission spectroscopy have been used to study the mechanism of reaction and the role of electron–phonon coupling in determining the photoreactivity of p-formylcinnamic acid (p-FCA) in the crystalline state. Raman and infrared spectroscopy in the internal vibration region have been used to characterize the reactant p-FCA and the dimeric product t-3,t-4-bis(p-formylphenyl)-ν-1,c-2-cyclobutanedicarboxylic acid. Phonon spectroscopy reveals that the reaction proceeds principally by a heterogeneous mechanism though a homogeneous mechanism in the initial stage of short time domain can not be ruled out. The electronic spectroscopy suggests a strong electron–phonon coupling in the monomer crystal.
Fluorescence Spectra of Anthracene Liquid
Authors: Iwasaki Noriko , Horiguchi Rumiko , Maruyama Yusei 
Published: July 2006

Abstract
An excimer-like fluorescence band at 470 nm was observed for anthracene liquid. A distinct shoulder at 414 nm was recognized in the absorption spectrum of anthracene liquid. These results suggest the existence of dimeric aggregates in this liquid.
The Determination of the Dissociation Constants of Picric Acid and 2,2′,4,4′,6,6′-Hexanitrodiphenylamine in Ketone–Water Mixtures
Authors: Iwachido Tadashi , Oosawa Shinji , Tôei Kyoji 
Published: July 2006

Abstract
The acid dissociation constants, Ka, of picric acid and 2,2′,4,4′,6,6′-hexanitrodiphenylamine in acetone, ethyl methyl ketone, and isobutyl methyl ketone were determined in the presence of water. The pKa values increased remarkably with a decrease in the water content. The pKa values in water-free ketones were estimated.
Triplet–Triplet Energy Transfer between the Same Molecular Species
Authors: Masumo Kunio , Ebara Nozomu 
Published: July 2006

Abstract
A method for obtaining the rate constants for triplet–triplet energy transfer between the same molecular species is presented. It is an improvement on a previously proposed method and comprises an analysis of the phosphorescence decay curve of a mixture of an organic substance and its deuterated homolog. It has been found that the new method gives a good fit to experimental decay curves at 77 and 4.2 K. It was also found that the critical transfer distance between similar molecules is usually smaller than that between differrent molecules.
Breathing Vibration of Cyclohexane Ring in Cyclohexanol
Authors: Takeoka Yoshiko 
Published: July 2006

Abstract
It was found that the wave numbers of the bands due to the breathing vibration of the cyclohexane ring in the e-conformer are higher than 802 cm−1 in the monosubstituted cyclohexane-derivatives having substituents Cl, Br, I, SH, SD and SCH3, while lower than 802 cm−1 in cyclohexanol and fluorocyclohexane. The effect of introducing OH group to the cyclohexane ring upon this band was studied.
Electronic Spectra of a Simple Trimethine Cyanine Dye Crystal. (3-Dimethylamino-2-propenylidene)dimethylammonium Perchlorate
Authors: Otsu Masakazu , Tanaka Jiro 
Published: July 2006

Abstract
The electronic spectra of the simplest polymethine cyanine dye crystal were studied by measuring the reflection spectra of (3-dimethylamino-2-propenylidene)dimethylammonium perchlorate. The spectra consist of a single peak situated at 32400 cm−1 in solution. Davydov splitting is observed in the crystal spectra and it is explained by calculating the dipole–dipole interaction energy and the interaction energy between the transition densities with the Ewald sum method.
Reactions of Ozone with 1-(m-Substituted phenylazo)-2-naphthol-6-sulfonic Acids in Aqueous Solutions
Authors: Onari Yasuo 
Published: July 2006

Abstract
The substituent effect on the ozone decoloration reactions of 1-(m-substituted phenylazo)-2-naphthol-6-sulfonic acids (PANSA) in aqueous solutions was investigated. Both the acidities of PANSA and the variation of the ozone decoloration rates of them increased compared to those of the corresponding 1-(m-substituted phenylazo)-2-naphthol-3,6-disulfonic acids (PANDSA). The relationships between the decoloration rates and the indexes(pKOH and σm values) of the basicities of the dyes, however, indicated nearly the same characteristics between the data of these two series of dyes, and the ozone decoloration reactions of PANSA appeared to proceed by nearly the same mechanism as those of PANDSA. The changes of the keto–enol ratios of the dyes with their ozone decolorations suggested that the decoloration rates might rise as the reduction rates of their keto–enol ratios increased. It seems likely that the chief organic product that was finally produced in these reactions is oxalic acid.
Reduction of Aromatic Ketones or Thioketones with Phenylphosphine
Authors: Tamano Michiko , Koketsu Jugo 
Published: July 2006

Abstract
Reactions of certain aromatic ketones or thioketones with phenylphosphine and subsequent addition of diethyl disulfide gave the reduction products of the ketones and S,S-diethyl phenylphosphonodithioate or S,S-diethyl phenylphosphonotrithioate. A possible intermediate of the phosphine moiety was suggested to be phenylphosphinylidene [PhP=O] or phenylphosphinothioylidene [PhP=S]. The reduction of 10,10′-bianthrone and Δ10,10′-bianthrone resulted in the cleavage of the carbon–carbon single and double bonds and the reduction of the carbonyl groups, respectively.
Free Radicals Produced from the Derivatives of Pyrylium Salts in Solution by Photoillumination
Authors: Niizuma Shigeya , Sato Nobuyoshi , Kawata Hiroki , Suzuki Yoshizo , Toda Takashi , Kokubun Hiroshi 
Published: July 2006

Abstract
The photoreactions of 2,4,6-triphenyl- (TPP), 2-t-butyl-4,6-diphenylpyrylium (2BDPP) and 2,4,6-triphenylthiopyrylium (TPTP) salts in tetrahydrofuran (THF) and/or 1,2-dimethoxyethane were investigated. Photoproducts were identified to be pyranyl radicals on the basis of photochemical behavior and ESR spectra. Quantum yields of one-electron reduction reactions of TPP, 2BDPP, and TPTP were obtained to be 0.21, 0.047, and 0.53, respectively. The hf coupling constants of protons in the radicals were determined by simulation. The photoillumination of TPP in THF at low temperatures revealed that a certain intermediate radical species was involved in this one-electron photoreduction.
Kinetics of the Transfer of Picrate Ion at the Water/Nitrobenzene Interface
Authors: Osakai Toshiyuki , Kakutani Tadaaki , Senda Mitsugi 
Published: July 2006

Abstract
Kinetics of the transfer of picrate (Pic−) ion at the interface between an aqueous solution of lithium chloride (LiCl) and a nitrobenzene solution of tetrabutylammonium tetraphenylborate (TBATPB) has been studied by phase-selective a.c. polarography with a two-electrode cell system. By assuming Butler-Volmer type equations for the rate constants, the kinetic parameters of the Pic−-ion transfer have been determined at various concentrations of LiCl (0.02–1.0 mol dm−3) and TBATPB (0.05–0.17 mol dm−3). The rate constants virtually do not change with the electrolyte concentrations. Frumkin correction for the double-layer effect of the rate constants has been examined. The result seems to indicate that the observed potential dependence of the rate constants obtained in moderately concentrated electrolyte solutions may reflect the real potential dependence of the rate constants.
X-Ray Photoelectron Spectra of Halogen-bridged One-dimensional PdII–PdIV Mixed-valence Complexes, [Pd(en)2][PdX2(en)2](ClO4)4
Authors: Yamashita Masahiro , Murase Ichiro , Ikemoto Isao 
Published: July 2006

Abstract
X-Ray photoelectron spectra of [PdII(en)2][PdIVX2(en)2](ClO4)4 (en=ethylenediamine, X=Cl and Br) were measured. The difference in the binding energies of Pd3d between PdII and PdIV in the bromo-bridged complex is smaller than that in the chloro-bridged complex. This result is consistent with those of the crystal structures, electrical conductivities, and electronic spectra previously reported.
Reaction Volume for the OH− Addition to Hexafluoroacetylacetonate Ligand on CoIII Complex
Authors: Kitamura Yoichi 
Published: July 2006

Abstract
For the title reaction in water: L4Co(hfac)z+OH−=L4Co(hfacOH)z−1, reaction volumes (ΔV°) at infinite dilution were obtained at 25 °C, where A4 is (NH3)4, (en)2, α-trien, β-trien, f(N)-i-dtma, α-edda, β-edda, and Hhfac stands for hexafluoroacetylacetone. The resulting ΔV° values supported the addition of OH− to CoA4(hfac)z.
A Raman Study of Aqueous KOH Solution in Glassy State
Authors: Kanno Hitoshi , Hiraishi Jiro 
Published: July 2006

Abstract
Raman spectra of an aqueous KOH solution were measured in the OH stretching region and in the low frequency region (&lt;700 cm−1). Contrary to the results reported by Sharma and Kashyap, only one Raman band specific to an aqueous KOH solution was observed at ≈285 cm−1 in the low frequency Raman spectrum.
Reaction of Carbon Dioxide with 1-Phenylaziridine Catalyzed by Organo-antimony and -tin Compounds
Authors: Matsuda Haruo , Ninagawa Akira , Hasegawa Hiroshi 
Published: July 2006

Abstract
The reactions of carbon dioxide(CO2) with 1-phenylaziridine(1) to afford 3-phenyl-2-oxazolidone(2) were carried out in the presence of organo-antimony and -tin compounds as catalysts. Tetraphenylstibonium bromide(Ph4SbBr) and triphenyltin bromide(Ph3SnBr) were found to be active catalysts. The use of a polar aprotic solvent, such as a HMPA, provided optimal reaction conditions.
Synthetic Photochemistry. XXXII. Structures of By-products Formed in the Photocycloaddition of Myrcene to Methyl 2,4-Dioxoalkanoates
Authors: Takeshita Hitoshi , Komiyama Kei , Okaishi Koya 
Published: July 2006

Abstract
Structures of the by-products formed in the photocycloaddition of myrcene to methyl 2,4-dioxohexanoate and 2,4-dioxopentanoate were elucidated. They were shown to be formed by a 1,5-hydrogen shift of the intermediate (2+2)π adducts of conjugated dienes.
The Magnetic Properties of the Copper(II) Complexes with ω-Amino Carboxylic Acids
Authors: Emori Shuji , Noguchi Toshihiko , Muto Yoneichiro 
Published: July 2006

Abstract
Compounds of formula CuX2(OOC(CH2)mNH3)2·nH2O (m=2–5 and X=Cl or Br) and CuX3⁄2 (OOCCH2NH3) (X=Cl or Br) have been prepared and characterized by means of magnetic susceptibility and IR spectroscopy measurements. The correlation of their magnetic moments with the pKa values of their parent carboxylic acids is discussed.
CIDEP Study of 1,4-Naphthosemiquinone in Alcohols
Authors: Niizuma Shigeya , Sato Nobuyoshi , Kawata Hiroki , Murakami Osamu , Kanemoto Akihiko , Kokubun Hiroshi 
Published: July 2006

Abstract
A Chemically Induced Dynamic Electron Polarization (CIDEP) signal of 1,4-naphthosemiquinone (NQH·) was examined by intermittent-light irradiation to a system of 1,4-naphthoquinone (NQ) and phenol (PhOH) in toluene–2-propanol (2:3), toluene–ethanol (2:3), and neat 2-propanol. The enhancement factors of the initial polarization and the F-pair polarization of the systems were determined separately. From the unusual pattern of a time profile of the ESR signal with a CIDEP phenomenon observed on the photoirradiated NQ–PhOH system in ethanol, it is concluded that in ethanol the photoexcited NQ first abstracts a hydrogen to give NQH· then NQH· releases a proton to form NQ\ewdot.
Biionic Potential across Liquid Membranes with Some Anionic Surfactants
Authors: Nomura Kazuo , Matsubara Akira , Kimizuka Hideo 
Published: July 2006

Abstract
The biionic membrane potential was measured with the system in which a solution of calcium chloride was separated by a liquid membrane from a solution of another metal chloride. Four kinds of liquid membranes were prepared by dissolving calcium hexadecyl sulfate, stearate, cholate or deoxycholate in aqueous 1-octanol. All of the membranes studied were nearly permselective to cation. The membrane potential was analysed according to the Goldman-type equation based on the irreversible thermodynamics. The slope of a linear portion of the biionic potential vs. logarithmic activity curve showed fairly good agreement with the theoretical slope, i.e., 2.303×2RT⁄(ZCa+ZM)F per a ten-fold increase in activity, where ZCa and ZM were the valencies of calcium ion and another metal ion M existing across a membrane, respectively. The selective permeation coefficients of various metal ions were estimated for each membrane. The surprisingly small differences in the selective permeation coefficient between uni- and bi-valent cations were observed for the liquid membranes with calcium stearate, cholate or deoxycholate, while the about ten-fold increase in the coefficient per valency was observed for the liquid membrane with calcium hexadecyl sulfate. These results were discussed according to the theory previously presented.
Stopped-flow Studies on Binding of Cu2+ Ion to Human Serum Albumin
Authors: Kure Naohisa , Nakatsuka Thoru , Sano Takayuki , Yasunaga Tatsuya 
Published: July 2006

Abstract
Both static and kinetic investigations have been carried out regarding the interaction between Cu2+ and human serum albumin (HSA). The static experiment, using a UV spectrophotometric technique, shows the presence of one primary binding site and other weaker binding sites at pH 5.2. The kinetic experiment, using stopped-flow apparatus, revealed a reaction process on the order of several seconds and a rapid absorbance change within the dead-time of the apparatus. These results are discussed from the viewpoint of the substitution effect of the second residue of the N-terminal position in the protein with reference to the previously reported results for a Cu2+–bovine serum albumin (BSA) system.
Volume Changes and Equilibrium Constants for Protonation of [M(edta)]2−
Authors: Yoshitani Kouzou 
Published: July 2006

Abstract
The volume changes and the equilibrium constants for the first protonation of [Co(edta)]2−, [Ni(edta)]2−, and [Cu(edta)]2− (H4edta=ethylenediaminetetraacetic acid) have been determined from density and pH measurements at 25 °C. In the case of [Cu(edta)]2−, a second protonation is assumed to successively occur. The volume change and the equilibrium constant for the second protonation have been estimated. The volume changes for the first protonation of Co(II)-, Ni(II)-, and Cu(II)-edta chelates were small and positive (3.5, 3.3, and 4.8 cm3 mol−1, respectively) and that for the second protonation of a Cu(II)-edta chelate was larger than the first one (8 cm3 mol−1).
Surface Behaviors of Nucleic Acid Base-Containing Lipids in Monolayer and Bilayer Systems
Authors: Kitano Hiromi , Ringsdorf Helmut 
Published: July 2006

Abstract
Three kinds of nucleic acid base-containing lipids were synthesized and the surface behaviors of these compounds in monolayer and bilayer systems were examined. In the monolayer systems, the addition of a complementary nucleoside to a subphase solution extended the monolayer much more efficiently than that of other nucleosides because of hydrogen bonding between a pair of complementary bases. In the monolayer and bilayer systems, the photodimerization reaction of a thymine ring was confirmed by the change in the surface pressure of the monolayer and the decrease in absorbance and the broadening of the phase-transition peak in the DSC curve of the liposome solution.
α,β-Epoxy Sulfoxides as Useful Intermediates in Organic Synthesis. II. A Novel Synthesis of α-Sulfenylated Ketones and α-Sulfenylated Aldehydes from α,β-Epoxy Sulfoxides
Authors: Satoh Tsuyoshi , Kumagawa Takumi , Yamakawa Koji 
Published: July 2006

Abstract
Treatment of α,β-epoxy sulfoxides, prepared from 1-chloroalkyl phenyl sulfoxides and carbonyl compounds, with various kinds of alkane- or arenethiolates afforded α-sulfenylated ketones in good yields. This method also offered a novel procedure for a synthesis of α-sulfenylated aldehydes.
Preparation and Thermolysis of N-Ammonioamidates Containing Hydroxyl Group in Acyl Moiety
Authors: Masuyama Araki , Tsuchiya Kikuo , Okahara Mitsuo 
Published: July 2006

Abstract
The title N-ammonioamidates (aminimides) were prepared in satisfactory yields from lactones or α-hydroxy carboxylates. By the thermolysis of these aminimides in mesitylene, some types of urethane compounds were formed, depending on the structure of the aminimide and on the concentration of the solutions.
Photochemical Electron-transfer Reactions of Biphenyl-2,2′-dicarboximide and Naphthalene-1,8-dicarboximide with Olefin. Dependence of the Reaction Course on the Structure of the Aromatic Imide
Authors: Kubo Yasuo , Araki Takeo , Maruyama Kazuhiro 
Published: July 2006

Abstract
Photoreactions of N-methylbiphenyl-2,2′-dicarboximide and N-ethylnaphthalene-1,8-dicarboximide (2) with 1,1-diphenylethylene (3) in methanol gave methanol-incorporated 1 : 1 : 1-adduct (7) and 2,2-diphenylethyl methyl ether (6), an anti-Markovnikov adduct of methanol to 3. The ratio of the two types of products largely depends on the structure of the aromatic imides. Probably the spin densities of the radical anions of the aromatic imides seem to play an important role to determine the reaction courses after the photochemical electron-transfer process. Similar results were obtained in the photoreaction of N-(2-phenylallyl) aromatic imides; elimination induced by methanol-incorporation vs. anti-Markovnikov addition of methanol. Photoreactions of N-(trans-3-phenylallyl) aromatic imides in methanol gave methanol-incorporated O-cyclized products (20 and 27) and C-cyclized products (21 and 28). A tentative mechanism for the O-cyclization is proposed; i.e., intramolecular electron transfer followed by anti-Markovnikov addition of methanol to the radical cation of the double bond moiety, nucleophilic attack of the aromatic imide radical anion moiety, secondary electron-transfer, and then polar addition of methanol.
Mechanism of the Direct and Triplet-sensitized Photolysis of N-(1-Naphthoyl)-O-(p-toluoyl)-N-phenylhydroxylamine
Authors: Sakurai Tadamitsu , Sukegawa Hidenori , Inoue Hiroyasu 
Published: July 2006

Abstract
Quantum yields (Φ) were determined for benzophenone-sensitized and direct photolysis of the title hydroxylamine (NT). Analysis of linear Stern-Volmer plots of the reciprocal of Φ against the reciprocal of NT concentration reveals that the sensitized decomposition of NT takes place via its first triplet excited state (T1) produced by triplet-triplet energy transfer from benzophenone to NT. The fact that the quantum yields for the direct photolysis are independent of NT concentration indicates no occurrence of both self-quenching and induced decomposition of NT by the photochemically generated radicals. Closer examination of the micellar and solvent viscosity effects on the quantum yields for the direct photolysis with 313-nm light shows the existence of at least two spin-correlated (singlet) radical pairs: One is a contact radical pair whose recombination eventually yields 1,3-toluoyloxyl-migrated product and the other a solvent-separated radical pair from which 1,5-toluoyloxyl-migrated product is derived in competition with diffusive escape from the solvent or micelle cage. Exclusive occurrence of the direct photolysis from the first singlet excited state (S1) was explained on the basis of the large energy gap between S1 and T1 (31 kcal mol−1) which is likely to make intersystem crossing from S1 to T1 very inefficient.
The Wittig-type Reaction of O=C–, C=C–, and N=C–Substituted Methylenetriphenylphosphoranes with N-Sulfinyl-p-toluenesulfonamide. An Intramolecular 1,3-Dipolar Cyclization of Imidoylconjugated Thione S-Imides
Authors: Saito Takao , Nakane Michio , Watanabe Toshihiko , Motoki Shinichi , Kobayashi Kimiko , Sakurai Tosio 
Published: July 2006

Abstract
The Wittig-type reactions of N-sulfinyl-p-toluenesulfonamide with (1) O=C–, (2) C=C–, and (3) N=C-conjugated phosphorus ylides were investigated. In the reaction with (1), N-sulfinyl-p-toluenesulfonamide reacted at both the ylide and the carbonyl moiety to form TsN=C-conjugated thione S-imide, which underwent intramolecular 1,3-dipolar cycloaddition of the CSN group with the aromatic C=C bond of the tosyl group giving a structurally unique spiro-fused tricyclic adduct. The structure of the adduct was determined by means of X-ray diffraction. In the reactions with (2) and (3), 1-azadiene and sulfobetaines were obtained instead of the expected conjugated thione S-imides.
The Pressure Effect on Conductances of KCl in Ethanol–Water Mixtures at 25 °C
Authors: Ueno Masakatsu , Tsuchihashi Noriaki , Shimizu Kiyoshi 
Published: July 2006

Abstract
The molar conductances of KCl in 5, 10, 15, 20, and 30 mol% ethanol–water mixtures were measured in the dilute concentration range of (2–8)×10−4 M (1 M=1 mol dm−3) at 25 °C up to 1500 kgf cm−2 (1 kgf cm−2=0.9807×105 Pa). The Fuoss-Onsager conductance equation for unassociated electrolytes was used to determine the limiting molar conductance, Λ°, of KCl in 5 and 10 mol% of ethanol. In 15, 20, and 30 mol% of ethanol, where the ionic association takes place, the Shedlovsky equation was employed to obtain Λ° and the association constant KA of KCl. The limiting ionic molar conductances of the K+ and Cl− ions were determined by combining Λ° with the limiting transference number for KCl. The Walden products of both K+ and Cl− ions decrease with an increase in the pressure in 5 mol% of ethanol, but in 15 mol% of ethanol and above they increase with an increase in the pressure. These facts indicate that the breaking effect of these ions appears prominently in about 5 mol% of ethanol.
Use of Propagators in the Hückel Model. VI. Magnetic Perturbation and Ring Current
Authors: Ohmae Takayuki , Nishikawa Kiyoshi , Aono Shigeyuki 
Published: July 2006

Abstract
The electron propagator in the magnetic field is investigated under the Hückel approximation, and the electronic energy and the aromatic ring current are evaluated. The perturbation treatment for the ring current developed by McWeeny is easily reformulated in terms of propagator and then the physical features involved in this problem have been made considerably clearer.
The Crystal and Molecular Structure of 2,3,6,8,9-Pentaphenyl-1-thia-6-azaspiro[4.4]nona-2,8-diene-4,7-dione
Authors: Yasuoka Noritake , Kai Yasushi , Kasai Nobutami 
Published: July 2006

Abstract
The title compound crystallizes in monoclinic form, space group P21/c with a=20.810(1), b=16.000(1), c=18.131(1) Å, β=107.77(1)°, Z=8. The structure was established by the direct method and refined including all hydrogen atoms by the blockdiagonal least-squares procedure, R=0.062 for 4609 observed reflections. The heterocyclic spiran skeletons in two independent molecules have the same structure; however, four phenyl rings out of five take different conformations to the hetero rings to which they attached.