bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of 1-Azido-5-methyl-4-hexen-2-one and Its Catalytic Dimerization
Authors: Katagiri Takao , Agata Akira , Takabe Kunihiko , Tanaka Juntaro 
Published: July 2006

Abstract
1-Azido-5-methyl-4-hexen-2-one was synthesized easily from 4-methyl-3-pentenenitrile which was prepared from isoprene. This compound is quite stable. Its catalytic dimerization gave 4,4-bis(3-methyl-2-butenyl)-2-butenolide.
Photoreactions of the Uranyl Ion with Arylaldehydes in Solution
Authors: Matsushima Ryoka , Mori Kenichi , Suzuki Morio 
Published: July 2006

Abstract
Irradiation of benzaldehyde in a deoxygenated aqueous acetone solution in the presence of the uranyl ion with light of λ≥365 nm gives the U(IV) species and benzil (1) as the main photoredox products, and small amounts of 4-hydroxy-4-phenylbutan-2-one (2), trans-4-phenyl-3-buten-2-one (3), and an unidentified product (4). None of them are formed in the absence of the uranyl ion. The products 2 and 3 are assumed to be formed by the uranyl ion-photocatalyzed condensation of benzaldehyde with acetone. Irradiation of acetophenone in the presence of the uranyl ion gives no photoproducts, though the uranyl emission is effectively quenched. p-Methoxybenzaldehyde and p-chlorobenzaldehyde give the corresponding 4,4′-disubstituted benzils respectively by irradiation under similar conditions. The quantum yield for the formation of the U(IV) species decreases whereas the quenching constant increases with the increase in the electron donating power of the substituent. The physical quenching process appears to compete significantly with the chemical (redox) process. The relative importance of the physical quenching to the chemical quenching process has been estimated. As to the photocatalyzed aldol condensation, the excess vibrational energy, which the quencher and/or the quenchee would possess during or immediately after the quenching interactions, may possibly be converted into the energy of the chemical reaction.
Studies of the Effect of 1-Dodecanol on the Micellization of Sodium Dodecyl Sulfate by Gel Filtration
Authors: Suzuki Hitoshi 
Published: July 2006

Abstract
The tail analysis of gel filtration was applied to an aqueous sodium dodecyl sulfate (SDS) solution containing solubilized 1-dodecanol. Commercial SDS containing 1-dodecanol as an impurity showed a maximum micellar size at CMC. The addition of 1-dodecanol caused an increase in the micellar size due to solubilization. The amount of 1-dodecanol impurity was estimated from the elution rate of the micelle, Rm, the result being in agreement with that obtained by surface tension measurements.
Epoxide Rearrangement III. Isomerization of 1-Methylcyclohexene Oxide over TiO2–ZrO2, NiSO4 and FeSO4
Authors: Arata Kazushi , Akutagawa Susumu , Tanabe Kozo 
Published: July 2006

Abstract
The reaction of 1-methylcyclohexene oxide at 108 °C was found to give predominantly 2-methylcyclohexanone (III) over FeSO4, but predominantly allyl alcohols (VI) over TiO2–ZrO2 of various compositions. NiSO4 gave the same amount of both products, III and VI. The selectivities over FeSO4 and NiSO4 were not much varied with calcination temperatures from 150 °C to 700 °C, while the catalytic activities were higher with NiSO4 calcined at low temperature and with FeSO4 calcined at high temperature. FeSO4 and NiSO4 gave the preferential formation of an allyl alcohol with exo-double bond, 2-methylene cyclohexanol (VIa), while TiO2–ZrO2 formed predominantly an allyl alcohol with endo-double bond, 2-methyl-2-cyclohexene-1-ol (VIb). Both the acidity and basicity of TiO2–ZrO2 were observed to increase by mixing each oxide and to correlate with the catalytic activity. The allyl alcohol formation was explained by an acid-base bifunctional mechanism.
Theoretical Calculations of the Infrared Absorption Intensities of Simultaneous Transitions
Authors: Shinoda Hiroyuki , Mitsuya Munehisa 
Published: July 2006

Abstract
The formula of the infrared absorption intensity of a simultaneous transition has been derived on the basis of the vibronic expansion technique, with two simple assumptions. By the use of the foumula, the theoretical calculations of the intensities for the CO2–N2 and CO2–H2 systems have been done, the electronic wave functions being calculated by the CNDO/2 method. In both cases, it was found that the main contribution to the absorption intensity arises from the coupling between the electronic state of CO2 and the nuclear vibration of the homonuclear diatomic molecule. Furthermore, the intensities of the fundamental, first-overtone, and combination bands of CO2 have been calculated according to the formula corresponding to an intramolecular process, and the intensities of the overtone and combination bands caused by the intermolecular process have been calculated. These calculated results have been discussed in comparison with one another.
Inter- and Intramolecular Exciplexes and EDA Complexes in the 9,10-Dicyanoanthracene and Alkylbenzene Systems
Authors: Itoh Michiya , Kumano Yoshiro , Okamoto Toshihiko 
Published: July 2006

Abstract
The exciplex (above ∼150 K) and EDA complex (below ∼120 K) fluorescence were observed in the 9,10-dicyanoanthracene and several alkylbenzene systems and also in the intramolecular system of (9,10-dicyanoanthracene)-(CH2)3-(pentamethylbenzene) in the nonpolar solvents. The exciplex fluorescence lifetimes and maxima both in the inter- and intramolecular systems exhibit the continuous change to those of the corresponding EDA complex, which implies the identical fluorescent state of the exciplex and EDA complex. The fluorescence lifetimes and the fluorescence polarization suggest that the fluorescent state of both exciplex and EDA complex may be mostly locally excited state of electron acceptor.
Photoelectron Ejection and Fluorescence from Molecular “Rydberg” States in Polar Solvents
Authors: Nakato Yoshihiro , Nakane Akihiro , Tsubomura Hiroshi 
Published: July 2006

Abstract
Absorption and fluorescence spectra and photo-current yield curves of tetraaminoethylenes are studied. The UV absorption of these compounds is mostly attributable to the transitions from the ground state to the “vertical” Rydberg-like and ionized states. Their spectral shapes in ether and in pentane are nearly coincident with each other, showing that these states just after excitation are little affected by the solvent polarity. Based on this result and the results of photo-current measurements, the spontaneous formation of free, solvated electrons from the “vertical” Rydberg-like states in polar solvents has been verified. It is also found that the maximum wave numbers, the lifetimes and the yields of the fluorescence from the lowest “relaxed” Rydberg-like state depend strongly on solvent polarity, temperature and rigidity. These results are explained by taking account of the competition between electron ejection and relaxation processes and of the presence of a non-fluorescent, solvated cation-electron pair. The photo-electron ejection from other organic molecules in polar solvents reported before is shown to be explained by the same scheme as presented here.
Triplet Excimer of Phenanthrene in Fluid Solution. Dynamic Analysis of Time-Resolved Phosphorescence
Authors: Aikawa Masayuki , Takemura Takeshi , Baba Hiroaki 
Published: July 2006

Abstract
The excimer phosphorescence of phenanthrene in isooctane at temperatures over a range of 300–77 K has been studied by means of a photon-counting technique. At temperatures above the melting point of isooctane a broad emission spectrum with its intensity maximum at 525 nm was obtained, which is essentially different from the structured phosphorescence spectrum obtained in rigid media at 77 K. The time dependence of the spectral shape and intensity of the phosphorescence emission affords strong evidence that the broad emission spectrum originates from the triplet excimer. A scheme of the triplet excimer formation involving a self-quenching pathway of the triplet monomer is proposed to interpret the time and concentration dependence of the monomer and excimer phosphorescence.
Sum Rule Consideration of Molecular Photoelectron Spectra: s-Type Bands of Butenes
Authors: Katsumata Shunji , Kimura Katsumi 
Published: July 2006

Abstract
The s-type photoelectron bands of cis-, trans-2-butene, and 2-methylpropene in the gaseous phase have been measured in the region 17–27 eV by a He(II) resonance lamp which was constructed for the present purpose. The vertical ionization energies obtained here from the s-type bands have been interpreted with the H\ddotuckel method involving the Coulomb integrals of carbon 2s atomic orbitals which were estimated on the basis of the idea of sum rule from the available He(II) data of many other hydrocarbons reported by Potts et al.
Substitution Reactions of Several Lead(II)–Polyamine-N-polyacetate Complexes with Indium(III) in Aqueous Solutions
Authors: Nozaki Toru , Suemitsu Nagao 
Published: July 2006

Abstract
The kinetics of the substitution reactions of the lead(II) complexes of EDTA, EDTA·OH, CyDTA, and DTPA with the indium(III) ion have been studied in the pH range from 1.8 to 4.8 at 20 °C and at an ionic strength of 0.1 in the presence of an excess of lead(II) ions. The reaction for the CyDTA system seems to proceed through only the dissociative process, while those for the EDTA, EDTA·OH, and DTPA systems proceed through both the steps forming a binuclear intermediate and the dissociative steps, in which the reactions forming indium complexes proceed mainly through the paths involving InOH2+.
Selective Activation of Methylene or Methine Groups of Tripeptide-Schiff Bases Coordinated around Nickel(II)
Authors: Fujioka Mamoru , Nakao Yasuo , Nakahara Akitsugu 
Published: July 2006

Abstract
Nickel(II) chelates of the Schiff bases derived from salicylaldehyde and tripeptides such as glycylglycylglycine, glycyl-Dl-α-alanylglycine, glycylglycyl-Dl-α-alanine, and Dl-α-alanylglycylglycine have newly been prepared. The reactivity of methylene or methine groups in the tripeptide moieties of those Schiff base chelates has been studied by PMR spectra in D2O. It has been found that the methylene or methine protons of the N-terminal amino acid residues are most effectively activated by the coordination around nickel(II) as compared with those of the C-terminal and central amino acid residues.
An INDO Molecular Orbital Approach to the Proton Affinity of Oxygenated Compounds
Authors: Ohkubo Katsutoshi , Tsuchihashi Kohji , Yoshida Toshiaki , Okada Masahide 
Published: July 2006

Abstract
The correlation between the gas-phase proton affinities of aliphatic oxygenated compounds (alcohols, acids, and esters and their electronic structures was investigated by means of an INDO-MO theory. There appears to be a satisfactory linear-dependence of the proton affinities with the energy difference between the parent molecule and the energetically most stable protonated species and with the bond energy of the oxygen-proton bond, although the above energies are overestimated in comparison with the proton affinities. The proton affinities are also predicted with a sufficient accuracy using the first ionization potential and the electron density of the oxygen atom (especially, the % p-character in the oxygen lone-pairs) of the parent molecule.
The Reactions of 2-Substituted 4-Chloro-6-(2-hydroxy-1-naphthyl)-1,3,5-triazines with Several Nucleophiles
Authors: Tsunoda Shigeo , Hashida Yoji , Sekiguchi Shizen , Matsui Kohji 
Published: July 2006

Abstract
The nucleophilic substitution reactions of 2-methoxy- and 2-diethylamino-4-chloro-6-(2-hydroxy-1-naphthyl)-1,3,5-triazines (1) with aniline, diethylamine, sodium azide, and sodium methoxide were carried out and compared with the reactions of the corresponding derivatives of 4-chloro-6-(4-hydroxy-1-naphthyl)-1,3,5-triazine (2) and 4-chloro-6-(1-naphthyl)-1,3,5-triazine (3). Compound 1 was found to be more reactive than the corresponding (2) and (3), not only in the reactions of a neutral molecule, but also in those of anionic species. The results of the reactions of neutral species are interpreted in terms of the difference in solvation toward the substrates; however, the loss of coplanarity between the naphthalene and triazine nuclei may be responsible for the high reactivity of Compound 1 in the reactions of anionic species.
The Metal-Ion-Catalyzed Alcoholysis of β-Dicarbonyl Compounds
Authors: Uehara Kaku , Kitamura Fujio , Tanaka Makoto 
Published: July 2006

Abstract
The alcoholysis of β-dicarbonyl compounds of the type CH3COCHRCOR′ is catalyzed by a variety of metal ions. In the presence of a large excess of β-diketone compared with metal ions, the rate is given by the expression: rate=kobsd[M2+][ROH]. The values of kobsd decrease with M2+ in the order Zn2+&gt;Co2+&gt;Ni2+&gt;Cu2+. The reaction rate is remarkably affected by the substituents (R,R′), the kinds of alcohol and solvent used, the addition of a chelating agent, and also by the counter anion of the metal ion. The alcoholysis proceeds more slowly in CH3OD than in CH3OH by a factor of 1.4. These are interpreted in terms of a mechanism in which the β-dicarbonyl compound coordinated to a metal ion is attacked by the alcohol which is also coordinated to the metal ion to cleave the C2–C3 or C3–C4 bond of the dicarbonyl compound. A convenient method for the preparation of β,γ-unsaturated ketones and esters is provided by the alcoholysis of alkenyl substituted β-dicarbonyl compounds in the presence of zinc acetate.
The Reactions of the Dimers of Hexafluoropropene with O-Nucleophiles
Authors: Ishikawa Nobuo , Nagashima Akira 
Published: July 2006

Abstract
The reactions of the dimers of hexafluoropropene with alcohols and phenol in the presence of triethylamine, and with sodium alkoxides and phenolate were carried out. Of the two dimers, perfluoro-2-methyl-2-pentene (Dimer 2) was much more reactive than perfluoro-4-methyl-2-pentene (Dimer 1). While the dimer 2 and O-nucleophiles gave various addition and substitution products very easily, the dimer 1 reacted only with sodium alkoxides to give trialkoxylated products.
Palladium-catalyzed Decomposition of Azides. I. Formation of Nitriles
Authors: Hayashi Hiroshi , Ohno Atsuyoshi , Oka Shinzaburo 
Published: July 2006

Abstract
Palladium metal catalyzes the decomposition of benzyl azide affording benzonitrile, benzylamine, and N-benzylidenebenzylamine. The presence of a suitable hydrogen-acceptor improves the yield of benzonitrile at the sacrifice of benzylamine, whereas the yield of N-benzylidenebenzylamine remains constant. The reaction is applied to the preparation of other nitriles.
Anisotropy of Needle Cokes
Authors: Mochida Isao , Ogawa Masashi , Takeshita Kenjiro 
Published: July 2006

Abstract
The anisotropic properties of several lump needle cokes were studied by means of a X-ray diffractometer, a dilatometer, and a reflected microscope in order to evaluate the anisotropic factors of the needle cokes and to discuss the relations among them. Among them several relations were found, which were well understood on the basis of the structure of the uniaxial arrangement of the crystallites. The change in these factors upon heat treatment was also investigated in order to find how these factors depended on the crystal-growth of the needle coke. Some anisotropic properties of the extruded sample were compared with those of the filler coke, which were observed in a lump shape. The results indicate that the extruded sample had its anisotropic properties considerably lowered. The structure and crystal-growth of the needle cokes are discussed based on these observations.
Preparations and Properties of Some Derivatives of Pseudo-Geminal Ketone of Tris[2.2.2]paraxylylene
Authors: Imashiro Fumio , Yoshida Zen-ichi , Tabushi Iwao 
Published: July 2006

Abstract
Some derivatives of pseudo-geminal ketone of tris[2.2.2]paraxylylene (I) were prepared and their spectral properties were investigated in connection with their structural characteristics. The stereochemistry of two isomers of pseudo-geminal carbinols of tris[2.2.2]paraxylylene (III and V) was determined on the basis of chemical shifts of benzhydryl protons and Ho protons in NMR spectra and also of νO-H bands in IR spectra. The difference in chemical shifts of Hp protons of the two alcohols was explained in terms of the change in electron densities of para carbon atoms.
Nucleophilic Ion Pairs. I. Enhanced Esterolytic Reactivity of Hydrophobic Ion Pairs in Micellar Systems
Authors: Kunitake Toyoki , Shinkai Seiji , Okahata Yoshio 
Published: July 2006

Abstract
The reaction of the dodecyl(2-hydroxyimidophenethyl)dimethylammonium bromide(DHDB) and N-methylmyristohydroxamate (MMHA) anion with p-nitrophenyl acetate was studied mostly in the presence of aqueous nonionic micelles. Addition of a hydrophobic ammonium ion, TMAG, considerably enhanced the reactivity of MMHA but not that of DHDB (a zwitterion). The rate enhancement for MMHA-TMAC and DHDB in nonionic micelles were almost comparable to those in cationic(CTAB) micelles. It was proposed that the large enhancement observed for some anionic nucleophiles in cationic micelles is to a great extent caused by the formation of hydrophobic, desolvated ion pairs.
Reversible CO Insertion into an Ni–C Bond of Alkyl(acetylacetonato)(triphenylphosphine)nickel(II)
Authors: Saruyama Toshio , Yamamoto Takakazu , Yamamoto Akio 
Published: July 2006

Abstract
Reaction of alkyl(acetylacetonato)(triphenylphosphine)nickel(II), RNi(acac)(PPh3)n (R=C2H5, n=1 (1a); R=CH3, n=2 (1b)) with carbon monoxide gives acyl(acetylacetonato)(triphenylphosphine)nickel(II) RCONi(acac) (PPh3) (R=C2H5 (2a); R=CH3 (2b)). Elemental analysis, IR and NMR spectra, and chemical properties of the acylnickel complexes support the structure. A variable temperature NMR spectroscopic study has revealed that the acac ligand in the acyl complexes exchanges rapidly in solution on NMR time scale. The acylnickel complexes 2a and 2b tend to decarbonylate at room temperature, the decarbonylation tendency of 2b being greater than 2a. They undergo further disproportionation according to the stoichiometry: 3RCONi(acac)(PPh3)→RCOR+Ni(CO)2(PPh3)2+Ni(acac)2+RNi(acac)(PPh3). The mechanism involving the cross coupling of the acylnickel complex with the alkylnickel complex is proposed for the reaction on the basis of formation of CH3COC2H5 on reaction of 2a with 1b.
Hydroquinone and Quinone Derivatives of the (Z)- and (E)-β-Thiocrotonates
Authors: Campaigne E , Abe Yasuo 
Published: July 2006

Abstract
Addition of ethyl thioacetoacetate to p-benzoquinone and 1,4-naphthoquinone gave satisfactory yields of the expected ethyl(Z)-β-(2,5-dihydroxyphenylthio)crotonate and ethyl(Z)-β-(1,4-dihydroxynaphthyl-2-thio)crotonate respectively. In the latter case, at higher temperatures the isomeric ethyl(E)-β-(1,4-dihydroxynaphthy 1-2-thio)crotonate was the major product. Oxidation of these compounds with chromic acid gave the corresponding Z-and E-isomeric quinone derivatives, but oxidation of the Z-isomer of the phenyl compound at higher temperatures gave the (E)-quinone derivative. All eight isomers in these two series have been isolated, characterized and identified by NMR assignment.
ESR Spectra of Nitric Oxide Adsorbed on ZrO2, CeO2, and ThO2
Authors: Niwa Miki , Minami Takashi , Murakami Yuichi 
Published: July 2006

Abstract
ESR spectra of nitric oxide adsorbed on ZrO2, CeO2, and ThO2 were measured at −196 °C, and g⊥, g⁄⁄ and splitting constants were determined.
The Spectrophotometric Determination of Beryllium with Chromazurol S and Polyoxyethylenedodecylamine
Authors: Nishida Hiroshi , Nishida Taeko , Ohtomo Hiroshi 
Published: July 2006

Abstract
A sensitive and selective method for the spectrophotometric determination of beryllium with Chro mazurol S (CAS) and polyoxyethylenedodecylamine(POEDA) in the presence of EDTA and perchlorate is proposed.
The Mercury-photosensitized Reaction of Hydrogen with Nitric Oxide
Authors: Tadasa Kohji , Imai Naomi , Inaba Tetsuo 
Published: July 2006

Abstract
The Hg-photosensitized reaction of a mixture of H2 and NO has been studied mainly at room temperature. The quantum yield of the H2O formation is nearly unity, independent of the pressures of both H2 and NO. The quantum yield of the N2 formation is proportional to the NO pressure, while that of N2O decreases with the NO pressure; both of them are independent of the H2 pressure. In order to interpret the results concerning the H2O formation, the following process is proposed:
(i) NO3+NO→2NO2
NO2+HNO→OH+2NO
OH+HNO→H2O+NO
in addition to the well-established H2O-forming process:
(ii) 2HNO→H2O+N2O
NO2, one of the reactants in Process (i), is formed by the chain process proposed by Arden and Phillips:
(iii) H+NO+M→HNO+M
HNO+2NO→N2+H+NO3
The (ii) and (iii) processes also coincide with the results of the N2O and N2 formations respectively.
The Crystal and Molecular Structure of Zinc Complex of 2-Chlorobenzoic Acid. I. The Crystal and Molecular Structure of Bis(2-chlorobenzoato)zinc(II)
Authors: Nakacho Yoshifumi , Misawa Takeshi , Fujiwara Takaji , Wakahara Akio , Tomita Ken-ichi 
Published: July 2006

Abstract
The crystal of bis(2-chlorobenzoato)zinc(II) is monoclinic, space group P21/c, a=7.284, b=10.480, c=19.091 Å, β=95.59°, and Z=4. The structure was solved by usual heavy atom method and refined to the final R-value of 0.052. In the crystalline state, the complex forms a chain. Each zinc atom is bonded to four oxygen atoms from four different ligands.
Magnetic Two-dimensionality and Antiferromagnetism in the DANO Crystal
Authors: Takizawa Osamu 
Published: July 2006

Abstract
An organic free radical crystal, the di-p-anisyl nitric oxide (DANO) crystal, was found to exhibit the characteristics of the two-dimensional Heisenberg spin system in its magnetic susceptibility at low temperatures and in its angular dependence of the ESR line width at room temperature. A distinct minimum of magnetic susceptibility due to a phase transition to antiferromagnetic spin ordering was observed at 1.67 K; this is consistent with the results of the NMR measurements, while another unexplainable anomaly was found near 2.7 K. The magnetic anisotropy field, HA, along the a-axis, perpendicular to the magnetic easy-plane, was determined to be (3±1)×102 Oe at 0 K from the analysis of the antiferromagnetic resonance; it was attributed to the magnetic field originating from the spin magnetic dipoles distributed over the radical molecules. The ratio of the anisotropy field to the exchange field within the magnetic two-dimensional plane, HA⁄HE, and that of the Néel temperature to the Weiss temperature, TN⁄θ, were found to be 5×10−3 and 0.34 respectively. The ratio of the inter-plane exchange interaction to the intra-plane one, J′⁄J, was estimated therefrom to be of the order of 10−3.
A Structure Analysis of a Bromoacetate of Hydroxypiperenone by the X-Ray Diffraction Method
Authors: Matsui Kuniaki , Fukuyama Keiichi , Tsukihara Kumiko , Tsukihara Tomitake , Katsube Yukiteru , Munakata Katsura 
Published: July 2006

Abstract
The structure of a bromoacetate of hydroxypiperenone, C24H31O7Br, has been determined by the X-ray diffraction method. The compound crystallized in the space group P21 with a=8.296, b=13.247, c=11.400 Å, and β=102.8°. The structure was solved by the heavy-atom method and refined to R=0.075 for 1614 reflections. The present analysis has established that the five- and six-membered rings are fused in the cis fashion. The absolute configuration of the molecule has been determined by using the anomalous dispersion effect of the bromine atom for Cu Kα radiation.