bluuebunny/crossref_metadata_2025 huggingface dataset:
First Total Synthesis of (+)-Caparratriene
Authors: Li Jing , Liu Zuosheng , Lan Jiong , Li Yulin
Published: June 2004

Caparratriene (1), a new sesquiterpene hydrocarbon with significant growth inhibitory activity against CEM leukemia cells, was first synthesized starting from (R)–(+)–citronellal through 3 steps in an overall yield of 17.5%. The absolute configuration at C7 was determined as R.
Selective Oxidation of Toluene over the Ultrafine Composite Molybdenum-Cerium Oxide Particles
Authors: Fan Yining , Kuang Wenxing , Chen Yi
Published: June 2004

The ultrafine composite Mo-Ce oxide particles exhibit higher catalytic activity for selective oxidation of toluene to benzaldehyde than the corresponding large oxide particles prepared by conventional precipitation method, which can be correlated to the higher reactivity of lattice oxygen ions in the ultrafine oxide particles.
μSR of the Organic Radical Ferromagnet, 4-(p-Chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl
Authors: Imachi Ron , Ishida Takayuki , Nogami Takashi , Ohira Seiko , Nishiyama Kusuo , Nagamine Kanetada
Published: June 2004

The presence of spontaneous magnetization in the crystal of the title radical below the Curie temperature (TC) was confirmed by means of zero-field muon spin rotation and relaxation measurements. The TC was determined to be 0.28 K. A critical magnetization exponent suggested the 3-dimensional ordering of the radical spins.
Pinacolic Coupling of Aromatic Carbonyl Compounds Using Zn Powder in Aqueous Basic Media without Organic Solvents
Authors: Tsukinoki Takehito , Kawaji Takatoshi , Hashimoto Iwao , Mataka Shuntaro , Tashiro Masashi
Published: June 2004

Treatment of aromatic carbonyl compounds with Zn powder in 10% aq NaOH solution without using any organic solvents under the mild conditions afforded the corresponding 1,2-diols in good yields.
Effective Catalysts for Transfer Hydrogenation of Ketones and Imines by Propan-2-ol : Ruthenium-Hydride or Ruthenium-Dihydride Complexes
Authors: Mizushima Eiichiro , Yamaguchi Motowo , Yamagishi Takamichi
Published: June 2004

The ruthenium-hydride complexes, [RuHCl(PPh3)3] and [RuH2(PPh3)4] act as very active catalyst for transfer hydrogenation of ketones and imines by propan-2-ol. The ruthenium-dihydride complex, [RuH2(PPh3)4], could catalyze the transfer hydrogenation without base.
Precise Measurement of Atmospheric Concentration of CH3Br by GC/ECD
Authors: Sudo Shigeto , Tominaga Takeshi , Makide Yoshihiro
Published: June 2004

A precise measurement system of atmospheric CH3Br at background concentration level was developed for the survey of its spatial and temporal distribution by gas chromatographic separation with dual Porapak Q columns and detection with an electron capture detector.
99Ru-NMR Spectroscopy of Ruthenium(II) Tris-Polypyridine Complexes
Authors: Xiaoming Xiao , Matsumura-Inoue Takeko , Mizutani Shigeo
Published: June 2004

The 99Ru-NMR spectra of a series of tris-polypyridine ruthenium(II) complexes were studied in acetonitrile solution. The spectroscopic results indicate that the 99Ru-NMR chemical shifts of these complexes are sensitive to the environment around the metal center. The correlation between the 99Ru-NMR chemical shifts and the energy of metal-to-ligand charge transfer, EMLCT, was discussed.
Mechanism of Dye Bleaching upon Laser Excitation of Crystal Violet Bound to Bovine Serum Albumin
Authors: Indig Guilherme L
Published: June 2004

The laser induced photobleaching of crystal violet non-covalently bound to bovine serum albumin yields leuco crystal violet and Michler’s ketone as reaction products. The first step of the bleaching process is postulated to be an electron or hydrogen atom transfer from the protein to the dye moiety.
Supercritical Water Oxidation of a PCB of 3-Chlorobiphenyl Using Hydrogen Peroxide
Authors: Hatakeda Kiyotaka , Ikushima Yutaka , Ito Shota , Saito Norio , Sato Osamu
Published: June 2004

The supercritical water oxidation (SCWO) of a PCB of 3-chlorobiphenyl (1) was carried out at a temperature of 673 K and a pressure of 30 MPa with a flow reactor. The initial concentrations of (1) and hydrogen peroxide ranged from 1.84 × 10−3 to 8.74 × 10−2 M (1 M = 1 mol dm−3), and 0.181 to 2.67 M, respectively. The decomposition of (1) was higher than 99.9% so long as hydrogen peroxide was stoichiometrically added.
Preparation and Structure of a Novel Tetranuclear Mixed-Valence Vanadium(IV/V) Complexes Having Alkoxo and Oxo Groups
Authors: Kumagai Hitoshi , Kawata Satoshi , Kitagawa Susumu , Kanamori Kan , Okamoto Ken-ichi
Published: June 2004

Novel tetranuclear complexes, M4[V4O4(μ-O)2(dptaO)2]•nH2O (M = Na, n = 4; M = Cs, n = 10) (dptaO = 1,3-diamino-2-propanoltetraacetato) having a mixed-valence (V(IV) and V(V)) V4O84+ core, are first synthesized and characterized by X-ray cystallography, EPR and UV-Vis spectroscopy. The four vanadium atoms reveal octahedral geometry, very close to each other, and afford a nearly square-planar nuclear core.
Unusually Large Magnetic Interactions Observed in Hydrogen-Bonded Nitronyl Nitroxides
Authors: Yoshioka Naoki , Irisawa Munetoshi , Mochizuki Yuichiro , Kato Takanari , Inoue Hidenari , Ohba Shigeru
Published: June 2004

Two nitronyl nitroxide derivatives bearing imidazole and benzimidazole ring were prepared and their hydrogen-bonded structures and magnetic properties were characterized.
Thermochromism of Polysilanes Bearing Non-Ionic Polar Side Chains and Some LiClO4 Salt
Authors: Oka Kunio , Fujiue Naofumi , Nakanishi Saburo , Takata Toshikazu , Dohmaru Takaaki , Yuan Chien-Hua , West Robert
Published: June 2004

The titled polysilanes, {CH3-O(CH2CH2O)n-CH2CH2CH2-Si-CH3}x (n = 1∼3), are thermochromic both in the solid state and in solution. In the solid state these polysilanes all show a continuous bathochromic shift until nearly the same kink point temperature(190 K), then blue shift slightly. A water-soluble polysilane, n = 3, forms a complex with LiClO4. The thermochromic behavior of the complex is highly dependent on Li content. The complex of higher Li content shows only a blue shift on cooling while complexes of low Li content display red shift initially till Tg and then blue shift. An unexpected hyperchromic effect accompanied by the blue shift observed for the complex of Si:Li = 1:1 on cooling.
N-Cyano-N′-diethylaminophenyl-1,4-naphthoquinonediimines: New Chromophores for Second-order Nonlinear Optical Materials
Authors: Kubo Yuji , Takaba Toyohisa , Aramaki Shinji
Published: June 2004

New chromophores for second-order nonlinear optical materials, N-cyano-N′-diethylaminophenyl-1,4-naphthoquinonediimines, were proposed. The electro-optic poled polymers showed large second-order nonlinear hyperpolarizability (μβ) in a constant electric field at incident irradiation wavelength of 1.3 μm, being 4 - 6 times than that of commonly used Disperse Red 1.
Electric Birefringence of Na-Montmorillonite Suspended in Water-Ethanol Mixed Solvent
Authors: Sasai Ryo , Gekko Kunihiko , Yamaoka Kiwamu
Published: June 2004

In order to clarify the effect of ethanol on the electrooptic and hydrodynamic properties of Na-montmorillonite (Na-M), the transient and steady-state electric birefringence (EB) of Na-M was measured in the water-ethanol mixed solvent system at a low particle concentration and at various ethanol contents. The hydrodynamic size of Na-M was decreased at ca. 10 vol% in EtOH content. This first EB attempt strongly supports the notion that the Na-M layers are delaminated by the adsorption of EtOH molecules onto the Na-M disk.
Formation of the He(3s,3p,3d) States by Ion-Ion Neutralization Reaction of He+ with C6F6− in the Helium Flowing Afterglow
Authors: Tsuji Masaharu , Nakamura Masafumi , Nishimura Yukio
Published: June 2004

The ion-ion neutralization reaction of He+ with C6F6− has been spectroscopically studied in a He flowing afterglow. Six He(3s, 3p, 3d) states in the energy range of 22.72-23.09 eV ware produced. The electronic state population decreased rapidly with increasing the excitation energy of the product He* atoms. The total triplet/singlet ratio of He* was 1.7.
Enhanced Electron-Transfer Quenching of Excited Ruthenium-Trisbipyridine by Viologen-Carbazole Linked Compounds in Aqueous Solutions
Authors: Yamada Keiji , Yonemura Hiroaki , Kuwahara Yutaka , Iida Shusaku , Matsuo Taku
Published: June 2004

Viologen-carbazole linked compounds quenched photoexcited tris(2,2′-bipyridine)ruthenium(II), abbreviated to Ru-trisbpy, much more efficiently than simple viologen in aqueous solutions. The observation was ascribed to enhanced electron-transfer to partially dehydrated viologen as deduced from spectroscopic- and electrochemical evidences.
Dimer Formation of Anthracene in Langmuir-Blodgett Films as Revealed by Time-Resolved Fluorescence Spectra
Authors: Mukai Ikuo , Abe Kei , Akimoto Seiji , Ito Takashi , Ohta Nobuhiro , Yamazaki Iwao
Published: June 2004

Anthracene incorporated in LB monolayer films has been found to show excimer fluorescence due to a dimer which is different from the so-called sandwich dimer or the so-called stable dimer, whose structure is known. Two types of excimer have been also found to be produced on excitation to the dimer.
A Negative-Working Alkaline Developable Photoresist Based on Calix[4]resorcinarene, a Cross-linker, and a Photoacid Generator
Authors: Nakayama Tomonari , Haga Kohji , Haba Osamu , Ueda Mitsuru
Published: June 2004

A negative working photoresist based on calix[4]resorcinarene, 4,4′-methylenebis[2,6-bis(hydroxymethyl)phenol] (MBHP) as a cross-linker, and a photoacid generator, diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (DIAS), has been developed. A clear negative pattern was obtained when it was exposed to 365 nm UV light and postbaked at 130 °C, followed by developing with a 0.5% aqueous tetramethylammonium hydroxide solution at room temperature.
Hydrogen-Bond-Assisted Layered Assembly and Hydrocarbon-Chain Kink Defect of a Synthetic 1-Galactosamide Bolaamphiphile
Authors: Shimizu Toshimi , Masuda Mitsutoshi , Shibakami Motonari
Published: June 2004

A hydrogen-bond-assisted layered assembly of the synthetic 1-galactosamide bolaamphiphile, N,N′-bis(β-d-galactopyranosyl)decane-1,10-dicarboxamide has been characterized by single crystal analysis. The molecular structure includes a “kink” conformation of the connecting decamethylene chain based on a gauche-trans-gauche′ sequence.
Effect of HOMO Levels on Chemiionization of Substituted Ethylenes by Metastable Helium Atoms
Authors: Yamakado Hideo , Okamura Kohji , Ohshimo Keijiro , Kishimoto Naoki , Ohno Koichi
Published: June 2004

Chemiionization reactivity (Penning ionization cross section) of substituted ethylenes in collision with helium metastable atoms was studied by velocity-resolved Penning ionization electron spectroscopy. Collision energy dependences of ionization probabilities of π orbitals were found to correlate with the HOMO levels. The higher the HOMO levels, the more effectively the reactive site of the ethylenes is hit by metastable atoms because of increased attractive interactions.
Kinetic Isotope Effects for Addition of Lithium Pinacolone Enolate to Benzaldehyde
Authors: Yamataka Hiroshi , Sasaki Daizo , Kuwatani Yoshiyuki , Mishima Masaaki , Tsuno Yuho
Published: June 2004

The carbonyl-carbon-13 and phenyl-D5 kinetic isotope effects (KIEs) were measured for the reaction of benzaldehyde and lithium pinacolone enolate. The KIEs together with ab initio MO calculations indicated that a CC bond formation process is involved in the rate-determining transition state of the reaction. It was concluded that the enolate addition reaction proceeds in a different manner from those for MeLi and PhLi, for which the rate-determining step was judged to be an electron transfer step.
Electrospray Mass Spectrometric Detection of Neutral Rhenium Bipyridine Complexes Using NaNO3 as an Ionization Agent
Authors: Hori Hisao , Ishihara Jun , Koike Kazuhide , Takeuchi Koji , Ibusuki Takashi , Ishitani Osamu
Published: June 2004

Sodium nitrate can be used as a chemical ionization agent in the electrospray mass spectrometric analysis of neutral rhenium bipyridine complexes.
Photoinduced Reduction of gem-Dichlorocyclopropanes with SmI2 and Benzenethiol
Authors: Ogawa Akiya , Ohya Syoji , Hirao Toshikazu
Published: June 2004

Upon irradiation with visible light, gem-dichlorocyclopropanes undergo reductive dechlorination with samarium diiodide and benzenethiol to provide the corresponding cyclopropanes in good yields. The reaction may proceed via the hydrogen abstraction from PhSH by cyclopropyl radicals formed in situ by the reduction with SmI2.
Synthesis and Reactions of the First Lead–Sulfur Double-Bond Compounds, Plumbanethiones
Authors: Kano Naokazu , Tokitoh Norihiro , Okazaki Renji
Published: June 2004

Desulfurization of 1,2,3,4,5-tetrathiaplumbolanes 1 by a phosphine reagent gives the first lead–sulfur double-bond compounds, plumbanethiones 2. The cycloaddition reactions of plumbanethiones with MesCNO and PhNCS provide novel Pb-containing heterocycles.
Novel Method for Preparation of High Surface Area SnO2: Solvent Replacement by Alcohol
Authors: Suzuki Kenji , Satsuma Atsushi , Yoshida Hisao , Hattori Tadashi
Published: June 2004

A novel method named “solvent replacement” was proposed for the preparation of high surface area SnO2 containing no additive ions. The surface areas of thus obtained dried gels were much higher than that of gel prepared by a conventional method. The superiority of the novel method remained even after the calcination at 733 K: The surface area of SnO2 calcined under optimum condition was 108 m2g−1.
Anion Controlled Donor Alignment: Electrosynthesis and Crystal Structure of a Novel Cation Radical Salt Constructed from Porphyrin and Hexatungstate
Authors: Sugiura Ken-ichi , Sakata Yoshiteru , Tanaka Takanori , Sawada Masami
Published: June 2004

Elecrtochemical oxidation of tetrabutanoporphyrin free base with hexatungustate electrolyte produces a novel cation radical salt. X-ray crystallographic study showed that the crystal structure is constructed by C–H···O hydrogen bonds between the porphyrin and the inorganic counter anion.
Proton Driven Conformational Control of 12,13,25,26-Tetraaza-2,15-dithia[3.3]phenanthrolinophane
Authors: Wang Zhen-He , Hirose Takuji , Hiratani Kazuhisa , Baldwin Bruce W , Kasuga Kazuyuki
Published: June 2004

The conformational control of 12,13,25,26-tetraaza-2,15-dithia[3.3]phenanthrolinophane by protonation was accomplished both in solution phase and in the solid state as observed by nuclear magnetic resonance spectra and single crystal X-ray crystallographic analysis, respectively.
Photorefractivity Based on Photoinduced Ionic-conductivity Changes with Crowned Spirobenzopyran
Authors: Kimura Keiichi , Mizutani Ryoko , Aoki Shigetaka , Yokoyama Masaaki
Published: June 2004

Significant light diffraction by photorefractive effect has been realized with composite films consisting of a nonlinear optical compound, crowned spirobenzopyran, a polymeric lithium salt, and poly(methyl methacrylate), based on a mechanism of photochemical ionic-conduction control by the photochromic crown ether.
Positive-Working Alkaline Developable Photosensitive and Second-Order Nonlinear Optical Polyimide
Authors: Ueda Mitsuru , Sakai Yoshimasa , Nakayama Tomonari , Haba Osamu , Ishitaka Yoshihiko , Sasaki Yorihiko
Published: June 2004

A polyamic acid having a nonlinear optical chromophore was prepared by the ring-opening polyaddition of pyromellitic dianhydride and bis(4-aminophenyl)ether, and N,N-[bis(p-aminophenyl)amino]azo-4′-nitrobenzene. The polymer containing 30 wt% of 2,3,4-tris(1-oxo-2-diazonaphthoquinone-5-sulfonyloxy)benzophenone (5-DNQ) functioned as an alkaline developable photosensitive resist, and then converted to polyimide by thermal treatment.
Electronic States of Cobalt Iron Cyanides Studied by 57Fe Mössbauer Spectroscopy
Authors: Einaga Yasuaki , Sato Osamu , Iyoda Tomokazu , Kobayashi Yoshio , Ambe Fumitoshi , Hashimoto Kazuhito , Fujishima Akira
Published: June 2004

The electronic states of cobalt iron cyanides were observed using 57Fe Mössbauer. It was revealed that Prussian blue analogs Co1.5[Fe(CN)6]6H2O and K0.5Co1.25[Fe(CN)6]3.6H2O have FeIII(low spin) and FeII(low spin), respectively, at both room temperature and 4 K. In Co1.5[Fe(CN)6]6H2O, a magnetic hyperfine interaction was observed at low temperature. Moreover, the Mössbauer spectra provided clear evidence for an internal electron transfer from FeII to CoIII in K0.5Co1.25[Fe(CN)6]3.6H2O by red light illumination at low temperature.
Synthesis and Properties of 2,3,7,8,12,13,17,18-Octakis(methylthio)porphyrin (OMTP)
Authors: Sugiura Ken-ichi , Kumar Murugaeson Ravi , Chandrashekar Tavarekere K , Sakata Yoshiteru
Published: June 2004

2,3,7,8,12,13,17,18-Octakis(methylthio)porphyrin was synthesized via tetramerization reaction of 3,4-bis(methylthio)-2-hydroxymethylpyrrole.
Lithium-Bridged Bis(silyl anion) of 9,10-Dimethyl-9,10-disilaanthracene
Authors: Hatano Ken , Morihashi Kenji , Kikuchi Osamu , Ando Wataru
Published: June 2004

In a low temperature 29Si NMR spectrum measurement of 9,10-dimethyl-9,10-disilaanthracene dilithium (1), 29Si-7Li scalar coupling was observed. The 7Li NMR spectrum showed the two different environments for these two lithium atoms in 1 at 168 K. The spectral analysis strongly suggests a structure which has singly bridged lithium for two silicon atoms (1d).
Photoelectrochemical Responses of Polymer Langmuir-Blodgett Films Containing Tris(2,2′-bipyridine)ruthenium(II) Complex
Authors: Taniguchi Tatsuo , Miyashita Tokuji
Published: June 2004

Polymer Langmuir-Blodgett monolayer containing tris(2,2′-bipyridine)ruthenium(II) complex was prepared on an ITO electrode. In the presence of thiosalicylic acid as an electron donor, a large anodic photocurrent was observed by light irradiation on the polymer monolayer. The action spectrum of the photocurrent indicates that the generation of photocurrent is based on the excitation of the ruthenium(II) complex.
Unexpected Ligand Displacement of Ru(cod)(cot) with Trimethylphosphine to Give fac-Ru(6-η1:1-3-η3-C8H10)(PMe3)3
Authors: Hirano Masafumi , Marumo Tsuyoshi , Miyasaka Takashi , Fukuoka Atsushi , Komiya Sanshiro
Published: June 2004

Selective ligand displacement of the cod ligand in Ru(cod)(cot) (1) [cod: 1,5-cyclooctadiene, cot: 1,3,5-cyclooctatriene] with trimethylphosphine gives fac-Ru(6-η1:1-3-η3-C8H10)(PMe3)3 (3) in benzene at 50 °C.
First Characterisation of Enol Carbonate and Enol Carbamate Radical Cations in Solution. Kinetics and Selectivity of the Mesolytic Cleavage of the O–CO Bond
Authors: Schmittel Michael , Trenkle Holger
Published: June 2004

For the first time enol carbonate and enol carbamate radical cations are characterised in solution by CV and EPR; the sterically congested radical cations undergo an unprecedented mesolytic cleavage of the O–CO bond, the kinetics of which are determined.
Ethoxy Group Scrambling in the Sterically Restricted Ethoxysulfonium Salts, 1-(Methylethoxysulfonio)-9-(methylthio)dibenzothiophene and Its Analogous Compounds
Authors: Kimura Takeshi , Nakayama Hidetaka , Obinata Takanobu , Furukawa Naomichi
Published: June 2004

The ethoxy group migration of 1-(methylethoxysulfonio)-9-(methylthio)dibenzothiophene was identified by 1H-NMR at 25 °C. The similar rearrangement of 1-(methylethoxysulfonio)-8-(methylthio)naphthalene was found in identical conditions. The ethoxy scrambling did not proceed in 2-(methylethoxysulfonio)-2′-(methylthio)biphenyl.
Liquid Crystalline Oxadiazole with Electron Transporting Capability
Authors: Tokuhisa Hiroaki , Era Masanao , Tsutsui Tetsuo
Published: June 2004

In a thin film of an oxadiazole-based liquid crystal, 2,5-bis(4-octadecyloxybenzilidene-4-aminophenyl)-1,3,4-oxadiazole 1, fairly high electron mobility enhanced by molecular orientation was observed; electron mobility in the glassy liquid crystalline film of oxadiazole 1 was 3.6 × 10−5cm2V−1s−1 at an electric field of 2 × 105 Vcm−1 at room temperature, and the value was about ten times that in the isotropic glassy film of oxadiazole 1.
A Synthetic Approach to Benanomicin A: Synthesis of the Substituted 5,6-Dihydrobenzo[a]naphthacenequinone
Authors: Hirosawa Sehei , Nishizuka Toshio , Kondo Shinichi , Ikeda Daishiro
Published: June 2004

Tri-substituted α-tetralone has been synthesized and applied to the general synthesis of the substituted 5,6-dihydrobenzo[a]naphthacenequinone.
Photoeffects on Electrorheological Properties of TiO2 Particle Suspensions
Authors: Rao Tata Narasinga , Komoda Yasuo , Sakai Nobuyuki , Fujishima Akira
Published: June 2004

The electrorheological (ER) effect of TiO2/silicone oil fluids was investigated under illumination. Two types of commercial TiO2 powders showed opposite photoeffects on the ER properties. While the photoinduced increase in the ER effect for the first type arises from the polarization of photogenerated charges, the decrease in the effect of the latter type appears to be due to photoelectrophoresis, which may be facilitated by effects associated with the large surface area and high water content.
Selective Isobutene Formation in the CO Hydrogenation over Cs-doped ZrO2
Authors: Hara Michikazu , Kawamura Miyuki , Maruya Ken-ichi
Published: June 2004

The CO hydrogenation over Cs-doped ZrO2 catalyst has been investigated for the direct synthesis of isobutene from synthesis gas. The Cs-doping by the deposition of metallic Cs remarkably enhanced only the isobutene production over ZrO2, while the Cs-doping by CsOH decreased the catalytic activity of ZrO2.
Catalytic Oxidation of Amines Utilizing Binuclear Copper(II) Complex of 7-Azaindole
Authors: Minakata Satoshi , Ohshima Yasuhito , Takemiya Akihiro , Ryu Ilhyong , Komatsu Mitsuo , Ohshiro Yoshiki
Published: June 2004

Treatment of benzylamine with a catalytic amount of a binuclear copper(II) complex of 7-azaindole 1 under an oxygen atmosphere at room temperature produced benzylidene-benzylamine and benzonitrile in good yields. This reaction is also applicable to other amines and gives the corresponding imines. Interestingly 1-phenylpyrrolidine was oxidized to cyclic dimers, but, in the presence of triethylamine, it was oxidized to the corresponding γ-lactam.
Bis(2-pyridinecarboxylato)vanadium(IV) in NaY Zeolite Cages: Synthesis and Spectroscopic Properties
Authors: Kozlov Alexander , Asakura Kiyotaka , Iwasawa Yasuhiro
Published: June 2004

Encapsulated vanadium(IV) picolinato complex was synthesized by treatment of VO2+-NaY zeolite with molten picolinic acid. The structure of the ‘ship-in-a-bottle’ species was determined by EXAFS, XANES, ESR, IR and UV-vis spectroscopies. It was suggested by XPS and XRD that the complex was located in the zeolite cage. VO(pic)2-NaY has been shown to retain solution like activity in oxidation of alkanes, alcohols and benzene with hydrogen peroxide.
Tribo- and Thermo-Luminescence of Aromatic Aldehydes
Authors: Koyanagi Motohiko
Published: June 2004

We found that two typical aromatic aldehydes, 2-furaldehyde and benzaldehyde, sometimes exhibit triboluminescence when these fluid materials at room temperature undergo phase transitions from their glassy phase to crystalline phases under a reduced pressure at low temperature, e. g., at 77 K. Several optical features thereof have been reported in the present paper. We also often observed characteristic thermal luminescence for a good few 2-furaldehyde solids which were subjected to large and frequent triboluminescence processes.
Preparation of Primary Amines by the Copper(I) Catalyzed Reaction of 4,4′-Bis(trifluoromethyl)benzophenone O-Methylsulfonyloxime and Alkyl Grignard Reagents
Authors: Tsutsui Hironori , Hayashi Yujiro , Narasaka Koichi
Published: June 2004

Primary amines are prepared by the reaction of 4,4′-bis(trifluoromethyl)benzophenone O-methylsulfonyloxime and alkyl Grignard reagents in the presence of a catalytic amount of CuCN•2LiCl and the successive acid hydrolysis of the resulting N-alkylimine derivatives.
Crystal Structure of [Cd{NH<(C2H4)2>NC2H4NH2}2{Ag(CN)2}]n•n[Ag(CN)2]: A Cationic Three-Dimensional Framework Built of Hetero-Bridged Octahedral Cd2+ and Tetrahedral Ag+ Accommodating Anionic Guest [Ag(CN)2]−
Authors: Soma Takayoshi , Miyamoto Takeshi Ken , Iwamoto Toschitake
Published: June 2004

In the title complex the N-(2-aminoethyl)piperazine and cyanide respectively bridge between octahedral Cd2+ and tetrahedral Ag+ to form a positively-charged three-dimensional host framework accommodating [Ag(CN)2]− anion as the guest.
Perfect On/Off Switching of Emission of Fluorescence by Photochromic Reaction of a Binaphthol-Condensed Fulgide Derivative
Authors: Inada Taeko , Uchida Soichi , Yokoyama Yasushi
Published: June 2004

While the colorless form of the propyl-substituted, binaphthol-condensed indolylfulgide did not emit fluorescence, its colored form, generated by the UV-light irradiation, emitted fluorescence in toluene at room temperature. Thus, a perfect on/off switching system of fluorescence controlled by the photochromic reaction has been exhibited.
Ultrasonic Effects on Electroorganic Processes. Cavitation Threshold Values of Ultrasound-oscillating Power
Authors: Atobe Mahito , Nonaka Tsutomu
Published: June 2004

Cavitation threshold values of ultrasound-oscillating power were clearly indicated in both the electroreduction of p-methylbenzaldehyde and the elelctrooxidation of hydroquinone.
Preparation of Cu(I) Complexes with N-Bonded or O-Bonded p-Cyanophenoxido Ligand and Their Structures in Soild State and in Solution
Authors: Osakada Kohtaro , Takizawa Tadashi , Koizumi Take-aki , Yamamoto Takakazu
Published: June 2004

Reaction of p-cyanophenol with [Cu(OCH(CF3)2)L3] (L = PPh3) gives [Cu(N-NCC6H4O)(N-NCC6H4OH)L2] (1), which possesses intermolecular O–H···O hydrogen bonding between the cyanophenoxido and cyanophenol ligands in the solid state and in solution.
Molecular Recognition Mechanism between Mesohemin and the Antibody 11D1
Authors: Feng Yan , Gao Gui , Chen Si-geng , Uemura Toshimasa , Yang Tongshu
Published: June 2004

This study focuses on the molecular recognition between mesohemin and the monoclonal antibody 11D1 specific for N-hydroxymethyl mesohemin. Results showed that the antibody 11D1 bound strongly to mesohemin with a dissociate constant of 2.1 × 10−6 M. A fluorescent spectroscopic study of the mesohemin binding to the antibody 11D1 suggested the existence of an electrostatic interaction between them. The interactions among the substrate, the mesohemin and the antibody 11D1 revealed that the mesohemin inserted into the binding site of the antibody 11D1 and bound to the antibody 11D1 with “edge-on” style.
Enhancement of β-Hydrogen Elimination Reaction on Platinum-containing Heterodinuclear Complexes
Authors: Fukuoka Atsushi , Sugiura Takeshi , Yasuda Toshiyuki , Taguchi Tomokazu , Hirano Masafumi , Komiya Sanshiro
Published: June 2004

Novel heterodinuclear ethylplatinum complexes with a 1,2-bis(diphenylphosphino)ethane (dpe) ligand (dpe)EtPt-MLn (MLn = MoCp(CO)3, WCp(CO)3, Mn(CO)5, Co(CO)4) have been synthesized and characterized. The dinuclear complexes show higher activity for β-H elimination reaction than a mononuclear PtEtCl(dpe), and in the case of Pt-Mo and Pt-W complexes the reaction proceeds with retention of the dinuclear structure.
Absolute Rate Constants of Mo2 (X 1Σg+) and Mo (a 7S3) with NO at Room Temperature
Authors: Wakabayashi Tomohiro , Nakai Yoshihiro , Ishikawa Yo-ichi
Published: June 2004

The gas-phase reactivities of nitrogen monoxide for groundstate molybdenum atoms and dimers have been investigated in a mass-flow controlled cell. Transient concentration of Mo (a 7S3) or Mo2 (X 1Σg+, v = 0) produced by 355-nm multiphoton decomposition of Mo(CO)6 was monitored by a laser-induced fluorescence. These measurements suggest the simple adduct formation such as Mo(NO) for the reaction of Mo + NO but a certain chemical bond activation of NO on Mo2.
In situ Formed Three Layer Film by Isomerization of Fluorinated Polyisoimide in Polyethersulfone as a Matrix Polymer
Authors: Mochizuki Amane , Yamada Kazuo , Ueda Mitsuru , Yokota Rikio
Published: June 2004

The novel three layer film comprised of a polyimide (PI)-polyether sulfone (PES)-PI structure has been developed. The film was cast from the homogeneous blend solution of polyisoimide (PII) and poly(oxy-1,4-phenylenesulfonyl-1,4-phenylene) (PES) in N,N-dimethylacetamide (DMAc) on to a glass plate. PII was prepared by the ring-opening polyaddition of 4,4′-hexafluoroisopropylidenebis(phthalic anhydride) (6FDA) and 4,4′-hexafluoroisopropylidenebis(p-phenyleneoxy)dianiline (BAPF) followed by treatment with trifluoroacetic anhydride (TEAA)-triethylamine (TEA) in N-methyl-2-pyrrolidone (NMP). The morphology of blend film was investigated by transmission electron microscopy (TEM). The formation of three layer film having a PI-PES-PI structure was confirmed by energy-dispersive X-ray analyzer (EDX).
Novel Solvent Effect on Highly Selective Photochemical Isomerization of 2-[2-(2-Pyrrolyl)ethenyl]quinoxaline
Authors: Arai Tatsuo , Maeda Yasunori
Published: June 2004

2-[2(2-Pyrrolyl)ethenyl]quinoxaline (II) underwent one-way trans→cis isomerization in benzene, while in methanol II underwent isomerization giving higher composition of trans isomer at the photostationary state.
Control of Product Distribution by Use of Surfactants in Cathodic Reduction of Acetophenone
Authors: Kodama Yorimitsu , Imoto Mitsutaka , Ohta Nobuaki , Kitani Akira , Ito Sotaro
Published: June 2004

In cathodic reduction of acetophenone to 1-phenylethanol and 2,3-diphenyl-2,3-butandiol, 1-phenylethanol was selectively yielded using micelle formed cationic surfactants at control potential −2.1 V.
Direct Observation of the Photoinduced Hydrogen Atom Transfer in 2′-Hydroxychalcone
Authors: Arai Tatsuo , Norikane Yasuo
Published: June 2004

2′-Hydroxychalcone underwent intramolecular hydrogen atom transfer through the hydrogen bonding as revealed by the observation of the tautomer triplet state.
Synthesis of Polycyclic Compounds by the Reaction of Co2(CO)6 Complexed 1-[o-(1-Alkynyl)phenyl]cyclopropanols
Authors: Iwasawa Nobuharu , Matsuo Takeshi
Published: June 2004

1-[o-(1-Alkynyl)phenyl]cyclopropanols are converted to 2,3-dihydro-1-naphthalenone derivatives by heating their hexacarbonyldicobalt complexes in 2-propanol. Furthermore, a new type of isomerization-cyclization reaction proceeds to give 3a,4-dihydro-3H-cyclopenta[a]inden-2-one derivatives when the same reaction is carried out in the presence of DABCO.
Rietveld Analysis of the Superconducting NaxHyC60
Authors: Nakano Chikako , Imaeda Kenichi , Kröber Jonas , Inokuchi Hiroo
Published: June 2004

The room temperature structure of a superconducting phase of NaxHyC60 was determined from the analysis of its powder X-ray diffraction pattern by the Rietveld method. THe space group is Fm3m, with Z=4, and the refined cell parameter a is 14.406(1) Å. Na+ ions in the octahedral and tetrahedral interstitial sites are offcentered. From their occupancies, the composition x is estimated at 3.6.
First Total Synthesis of Mer-N5075A, A New HIV-I Protease Inhibitor from Streptomyces Chromofuscus
Authors: Konda Yaeko , Takahashi Yukihiro , Mita Hiroka , Takeda Kazuyoshi , Harigaya Yoshihiro
Published: June 2004

The first total synthesis of Mer-N5075A (1), a new potential HIV-I protease inhibitor produced from Streptomyces Chromofuscus, was achieved. The synthetic method is available for Mer-N5075A analogues such as α-MAPI (2), GE20372 A (4) and other chemcally modified compounds.
A 16 Electron Cyclobutadiene—benzene-1,2-dithiolate Complex of Palladium(II) Bearing A Two-legged Piano-stool Geometry: (η4-C4Me2(tBu)2)Pd(1,2-S2C6H4)
Authors: Mashima Kazushi , Kaneko Sei-ichi , Tani Kazuhide
Published: June 2004

A 16-electron cyclobutadiene—palladium(II)—thiolate complex (η4-C4Me2(tBu)2)Pd(S2C6H4) (2: S2C6H4=1,2-benzenedithiolate) is prepared by treatment of [(η4-C4Me2(tBu)2)PdCl2]2 (1) with disodium 1,2-benzenedithiolate, and its monomeric two-legged piano-stool structure was characterized by X-ray analysis as well as its LMCT band caused by donation of the filled S(pπ) electrons to the empty Pd(dπ*) orbital.
Preferential Solvation Studied by the Fluorescence Spectrum of Pyrene in Water-Alcohol Binary Mixtures
Authors: Kusumoto Yoshihumi , Takeshita Yuka , Kurawaki Junichi , Satake Iwao
Published: June 2004

The local mole fraction of an alcohol such as methanol, ethanol, and 1-propanol was determined on the basis of the polarity variation sensed by pyrene in water-alcohol binary mixtures. The data indicate that alcohol molecules preferentially solvate pyrene in water; the degree of preferential solvation increases with an increase in the extent of the hydrophobic interaction between pyrene and alcohols.
The Mode of Substrate-Recognition Mechanism of Arylmalonate Decarboxylase
Authors: Kawasaki Takayasu , Saito Koji , Ohta Hiromichi
Published: June 2004

A mode of substrate-recognition mechanism by an enzayme, arylmalonate decarboxylase, is proposed. 19F- and 31P-NMR spectra of a complex consisting of the enzyme and an active site-directed inhibitor demonstrated that a hydrophobic interaction between the enzyme and its substrate via their aromatic rings was especially important for the enzyme function.
Effect of Structure of Modifiers Adsorbed on Gold Single Crystal Surfaces on the Promotion of the Electrode Reaction of Cytochrome c
Authors: Taniguchi Isao , Yoshimoto Soichiro , Nishiyama Katsuhiko
Published: June 2004

On Au(100) and Au(110) single crystal surfaces, clear electrochemical responses of cytochrome c were observed only at electrodes modified with bis(4-pyridyl)disulfide or 4-mercaptopyridine, but not at all on the surfaces modified with bis(2-pyridyl)disulfide or 2-mercaptopyridine.
Two Possible Pathways of Formation of Pristane and Phytane from Chlorophylls on Diagenesis: Carbon Isotopic Results from Laboratory Heating of Chlorophyll-a
Authors: Ishiwatari Mariko , Ishiwatari Ryoshi , Yamada Keita
Published: June 2004

Carbon isotopic ratios of C20 and C19 isoprenoid hydrocarbons (ISOPs) produced on laboratory heating (250 °C to 350 °C) of chlorophyll-a (Chl-a) were measured to understand the linkage between the phytyl chain of Chl-a and the ISOPs found in petroleum and geological samples. About 1 ‰ difference in carbon isotopic ratio was observed between the C20 and the C19 ISOPs. This difference almost agrees with that observed by Trindade et al. for the ISOPs in several petroleum mixtures.
Alternate Intercalation of Fluoran Dye and Tetra-n-decylammonium Ion Induced by Electrolysis in Acetone-Clay Suspension
Authors: Ito Kengo , Fukunishi Koushi
Published: June 2004

Electrochemically induced acid and base promoted the alternate intercalation of fluoran dye and tetra-n-decylammonium ion and the reversible color change of the dye in the acetone-clay suspension, and the procedure was applied to rewritable recording media by changing the polarity of the voltage.
Dissociative Excitation of CH4 via Triplet Superexcited State by Collisions with the Metastable Ne(3P0,2) Atoms in a Neon Flowing Afterglow
Authors: Tsuji Masaharu , Komatsu Takahiro , Tanaka Makoto , Nakamura Masafumi , Nishimura Yukio , Obase Hiroshi
Published: June 2004

The CH(A-X, B-X, C-X) emission systems have been observed in the energy transfer reaction of the metastable Ne(3P0,2) atoms with CH4 in a neon flowing afterglow. The nascent rovibrational distributions of CH(A,B) were determined by a spectral simulation: N0:N1:N2 = 100(T0 = 3500 ± 300K):58 ± 3(T1 = 2800 ± 200K):9 ± 1(T2 = 2400 ± 300K) for CH(A) and N0 = 100 (T0 = 3000 ± 300K) for CH(B).
Detection of the Site of an Enantioselective Interaction between Chiral Polypinanylsilane and a Hydrophobic Enantiomer by Use of Circular Dichroism
Authors: Shinohara Ken-ichi , Aoki Toshiki , Kaneko Takashi , Oikawa Eizo
Published: June 2004

Since optically active poly(methylpinanylsilane) synthesized by Na-mediated polycondensation of the corresponding dichlorosilane showed an Cotton effect at the UV region of Siσ-Siσ* transition of the main chain in the circular dichroism (CD) spectrum, the main chain was found to have a chirality. The Cotton bands in the presence of the (+)-isomer of a hydrophobic compound were different from those in the presence of the (−)-isomer. Therefore, this polymer was found to have an ability of the enantioselective recognition. On the other hand, a hydrophilic compound did not affect the CD band. These findings indicate that the recognition was caused mainly by hydrophobic diastereomeric interaction between the chiral compound and chiral main chain in this polymer.
Partial Oxidation of Light Alkanes during O2-H2 Cell Reactions at Room Temperature
Authors: Zhang Qinghong , Otsuka Kiyoshi
Published: June 2004

The partial oxidation of light alkanes (methane, ethane, and propane) has been carried out successfully by applying an O2-H2 cell at ambient temperature and atmospheric pressure. The conversion of alkanes increased in the order of CH4 < C2H6 < C3H8. The selectivity to useful oxygenates was the highest in the case of propane. The selectivity to acetone was higher than 65%.
Preparation of 1T-phase of Ta1−XIrXS2 System
Authors: Shimakawa Mamoru , Imazu Aya , Hayashi Koya
Published: June 2004

The 1T-phase in the TaS2-IrS2 system is prepared in the temperature range from 800 °C to 1000 °C. The 1T-phase is stable in the composition range between 0% and 50% IrS2 at 1000 °C. This 1T-phase is the compound of a new concept of the “electron-excess-1T”, judging from the number of valence electrons of the metal atoms.
A Facile Synthesis of (Imidazo[1,2-a]pyrimidin-2-yl)sugars by a Modified Maillard Reaction
Authors: Kolar Patrik , Tisler Miha
Published: June 2004

(5,6,7,8-Tetrahydroimidazo[1,2-a]pyrimidin-7(8H)-on-2-yl)sugars are easily prepared in a one-pot synthesis in basic ethanolic solutions from ethyl β-alaninate, d-aldoses and cyanamide in 21-48% yield.
Conformational Study of C2 Symmetrical Benzo[c]phenanthridine Alkaloid Derivatives
Authors: Marek Radek , Toušek Jaromír , Králík Lukáš , Dostál Jirí , Sklenár Vladimír
Published: June 2004

We report utilization of the phase-sensitive GSQMBC experiment for the study of benzo[c]phenanthridine derivatives. The technique allows determination of the C2 symmetrical structures by observation of two different scalar interactions between H6 and C6 atoms as well as measurement of long range 1H-13C coupling constant. A prefered conformation determined using a dihedral angle constraint extracted from the measured 3JH,C coupling constant and AM1 calculations is discussed.
Direct Observation of a New Type Imperfection in Mordenite: Overgrowth of the Different Structure on MOR {110}
Authors: Yoshida Satoshi , Tokunaga Yuji , Kamioka Kunikazu , Okada Tadashi , Terasaki Osamu
Published: June 2004

A new type imperfection in mordenite, overgrowth of the different structure on MOR {110}, was observed by transmission electron microscopy(TEM). The overgrowth structure is a very small amount and/or minute, and would be a new zeolite structure produced locally.
Catalytic Properties of Ni-MoO3 for the Isomerization of Heptane
Authors: Matsuda Takeshi , Niwayama Takamitsu , Sakagami Hirotoshi , Takahashi Nobuo
Published: June 2004

The catalytic properties of Ni-MoO3 for the isomerization of heptane were investigated. After treatment with a mixture of H2 and heptane, Ni-MoO3 catalysts became active and selective for this reaction. The isomerization activity increased with increasing amount of Ni loading onto MoO3, indicating that Ni was an effective additive to enhance the catalytic performances of MoO3 for the isomerization of heptane.
Synthesis of β-Amino Esters by the Conjugate Addition of Nitrogen Nucleophiles to α,β-Unsaturated Esters Having Chiral p-Tolylsulfinyl Groups
Authors: Matsuyama Haruo , Itoh Nobuhiro , Yoshida Masato , Kamigata Nobumasa , Sasaki Sigeru , Iyoda Masahiko
Published: June 2004

The conjugate addition of nitrogen nucleophiles to t-butyl (E)-2-(p-tolylsulfinyl)cinnamates (1) afforded the corresponding chiral β-amino esters, which are important building blocks for synthesis of biologically active polyamine alkaloids. The diastereoselectivity of the reactions was 49 to 89%, and (S)-β-amino esters were obtained from (R)-1 while (R)-β-amino esters were synthesized from (S)-1, respectively.
Insertion of CO into a CH3-Pd Bond in a Heterodinuclear Complex (dpe)MePd-Co(CO)4. Preferential Insertion of Coordinated CO on a Cobalt Moiety
Authors: Fukuoka Atsushi , Fukagawa Sumiko , Hirano Masafumi , Komiya Sanshiro
Published: June 2004

A palladium-containing heterodinuclear complex (dpe)MePd-Co(CO)4 shows higher reactivity toward CO insertion than PdMeCl(dpe) and (dpe)MePt-Co(CO)4 to give an acetyl complex (dpe)AcPd-Co(CO)4. The insertion of CO ligand in Co(CO)4 is a kinetically favorable process.
Efficient Catalytic Hydrolysis of Disaccharides by Cerium(IV) Ion at pH 7
Authors: Ishida Hitoshi , Seri Kei-ichi
Published: June 2004

CeIV(NH4)2(NO3)6 effectively catalyses hydrolysis of various disaccharides such as sucrose, maltose, lactose, and cellobiose at pH 7.0, and activation energy for sucrose hydrolysis was found to be 14.4 kcal mol−1, which is remarkably smaller than that by 0.18 N HCl, 30 kcal mol−1.
Conformation and Redox Reaction of Poly(ethylene oxide)-modified Horseradish Peroxidase in Poly(ethylene oxide) Oligomers
Authors: Kawahara Natsue Y , Muneyasu Kuniaki , Ohno Hiroyuki
Published: June 2004

Horseradish peroxidase (HRP) was modified with poly(ethylene oxide) (PEO) with Mw of 750, 2000, or 5000. In PEO oligomer, the redox reaction of PEO-modified HRP at indium tin oxide electrode was clearly detected with both visible spectrometry and cyclic voltammetry.
Application of Chemiluminescent Probe to the Characterization of TiO2 Photocatalysts in Aqueous Suspension
Authors: Nosaka Yoshio , Fukuyama Hiroshi
Published: June 2004

A chemiluminescent probe, luminol, has been effectively applied to monitor the behavior of superoxide ions (O2•−) at photocatalytic reactions in aerated aqueous suspension of various commercially available TiO2 powders. By the addition of halide ions, the amount of O2•− increased or decreased depending on the properties of TiO2 powders. This difference is discussed with the difference in the mechanism of recombination via O2•− for the photoinduced electron-hole pairs.
Novel Lewis Acid Promoted Reactions of Allylsilane Bearing Bulky Silyl Substituents and Aldehydes
Authors: Akiyama Takahiko , Nakano Michiko , Kanatani Jun-ya , Ozaki Shoichiro
Published: June 2004

Reported herein are two novel modes of reactions that were mediated by the proper choice of Lewis acid. Thus, by the influence of SnCl4, allyl-t-butyldimethylsilane reacted with aldehyde in 2:1 stoichiometry to afford a ketone derivative. In contrast, use of BF3•OEt2 led to the formation of a 1,3-dioxane derivative, which is a 1:2 adduct.
Cathodic Oxidation of Sulfoxides to Sulfones Using a Tungstate/Pertungstate Redox Mediator
Authors: Li Wei , Nonaka Tsutomu
Published: June 2004

A new cathodic oxidation system for the oxidation of sulfoxides was developed. The system involves the cathodic reduction of dioxygen to hydrogen peroxide which oxidizes tungstate to pertungstate in the solution, and sulfoxides are oxidized to the corresponding sulfones with the resulting tungstate/ pertungstate redox mediator in high effiency and selectivity.
Highly Stereoselective Synthesis of 2′-Deoxy-α-ribonucleosides and 2-Deoxy-α-C-ribofuranosides by Remote Stereocontrolled Glycosylation
Authors: Mukaiyama Teruaki , Ishikawa Tatsuya , Uchiro Hiromi
Published: June 2004

A new and efficient method for catalytic highly α-selective N- and C-glycosylations of 2-deoxyribose derivative with various trimethylsilylated nucleophiles was successfully developed by utilizing effective remote stereocontrol with 5-O-diethylthio carbamoyl directing group. Several 2′-deoxy-α-ribonucleosides and precursors of its C-analogues were prepared in good yields with high stereoselectivities.
N-d-Biotinyl-7-amino-4-methylcoumarin as a Novel Fluorigenic Substrate for the Determination of Biotinidase Activity
Authors: Kunugi Shigeru , Nishino Norikazu , Mihara Hisakazu , Tandt Wilfried RDen , Scharpé Simon
Published: June 2004

A new fluorigenic substrate for the determination of biotinidase, N-d-biotinyl-7-amino-4-methylcoumarin has been synthesized by using BOP reagent. This substrate was used for measuring the enzyme activity in plasma of normal and biotinidase deficient patients. The methodology used here should be applicable to other biological fluids and homogenates to detect biotinidase deficiency.
Abiotic Asparagine Formation from Simple Amino Acids by Contact Glow Discharge Electrolysis
Authors: Munegumi Toratane , Shimoyama Akira , Harada Kaoru
Published: June 2004

Asparagine, one of the most important amino acids for prebiotic peptide formation in aqueous media, was formed using Contact Glow Discharge Electrolysis (CGDE) against aqueous solutions containing simple amino acids and carboxylic acid amides.
Diels-Alder Reactions of Fullerene C60 and 4-Hydroxytropones
Authors: Mori Akira , Takamori Yuuichi , Takeshita Hitoshi
Published: June 2004

7-Substituted 4-hydroxytropones reacted with C60 at 100 °C under 300 MPa to give two products; one was the adduct with a substituent on the bridge and the other the adduct with a substituent at the bridgehead position of the bicyclo[3.2.2]non-3-ene-2,6-dione system.
Colloid Formation from Vacuum Deposited Au Thin Layer on a UV-light Pre-exposed Polysilane Film
Authors: Nagayama Norio , Maeda Tomohiro , Yokoyama Masaaki
Published: June 2004

Vacuum deposited gold thin layer on a UV-light pre-exposed polysilane film underwent colloidal gold formation by heating. This process was found to accompany the degradation of polysilane by catalytic oxidation due to the formed colloidal gold. Such a phenomenon occurred in only the combination of polysilane and gold.
Benzoxetene. Direct Observation and Theoretical Studies
Authors: Tomioka Hideo , Matsushita Takeshi
Published: June 2004

Irradiation of either o-hydroxphenyldiazomethane or benzofuranone in argon matrix at 10 K generates benzoxetene which is in photoequilibrium with o-quinone methide.
Difference in the Rate of Photo-induced Unimolecular Motion of Chiral Salicylideneamines in the Chiral Crystal Environments
Authors: Kawato Toshio , Koyama Hiroyuki , Kanatomi Hajime , Shigemizu Hideki
Published: June 2004

From the kinetic investigation on the photochromic process of chiral N-salicylidene-1-phenylethylamine it was revealed that the rate of unimolecular asymmetric motion was influenced by the neighboring asymmetric crystal environments.
Catalytic Stereoselective Synthesis of α-d-Galactopyranosides from 2,3,4,6-Tetra-O-benzyl-d-galactopyranose and Several Alcoholic Nucleophiles
Authors: Uchiro Hiromi , Miyazaki Kazuo , Mukaiyama Teruaki
Published: June 2004

The glycosylation reaction of several alcoholic nucleophiles with 2,3,4,6-tetra-O-benzyl-d-galactopyranose (1-hydroxy sugar) is successfully carried out by the combined use of Sn(OTf)2-Me3SiCl catalyst system and lithium perchlorate, an effective additive. Several α-d-galactopyranosides are obtained in good yields with high stereoselectivities.
Importance of the Glycerol Structure of C-Pivot Lariat Ethers Containing a 16-Crown-5 Ring for Effective Complexation toward Alkali Metal Cations
Authors: Kita Kohji , Kida Toshiyuki , Nakatsuji Yohji , Ikeda Isao
Published: June 2004

The effect of the skeletal structure of the pivot position of the C-pivot lariat ethers containing a 16-crown-5 ring on their complexation properties toward alkali metal cations was examined. The glycerol structure was found to be necessary for the effective coordination toward the potassium ion.
Synthesis and Metal-Binding Properties of Novel “Fullerenocrowns”
Authors: Ikeda Atsushi , Fukuhara Chie , Shinkai Seiji
Published: June 2004

“Fullerenocrowns” in which C60 carbons are directly included as a ring member in the crown ring were synthesized for the first time; the UV-Vis absorption spectra were sensitively changed by the addition of metal and ammonium cations.