bluuebunny/crossref_metadata_2025 huggingface dataset:
Monolayer Formation and In-Plane Anisotropy of an Amphiphilic Block Molecule
Authors: Qin Lidong , Wu Lixin , Li Hongbo , Hou Xueliang , Qiu Dengli , Shen Jiacong
Published: September 2002

Coverage controlled monolayer nano-sheets with homogeneous height were fabricated by casting aqueous solution of amphiphilic rod-coil diblock molecule 1 on mica surface. The monolayer sheet was anisotropic, due to the asymmetric arrangement of the diblock molecule on surface, confirmed by polarization-dependent fluorescence spectra.
Switching of Terbium(III)-sensitized Luminescence by Ligand Exchange Reaction: Determination of Catecholamines
Authors: Takahashi Yukiko , Tanaka David A Pacheco , Matsunaga Hideyuki , Suzuki Toshishige M
Published: September 2002

Ligand exchange reaction between catecholamines and sulfosalicylic acid (SSA) in the ternary complex, [Tb(SSA)EDTA]4- leads to switch the luminescence signal, providing a simple detection system of catecholamines available in an aqueous solution.
A Benzene-Thermal Synthesis of Cubic Boron Phosphide (BP) Ultrafine Powders
Authors: Gu Yunle , Zheng Huagui , Guo Fan , Qian Yitai , Yang Ziping
Published: September 2002

Ultrafine boron phosphide (BP) with cubic cell was synthesized via a benzene-thermal reaction of boron powder and phosphorus trichloride (PCl3) with metallic lithium or sodium at 350 °C in an autoclave; initiating a new route and developing a facile technique for preparing BP.
DTBB-Catalyzed Lithiation of 4-Hetero-substituted Dibenzothiins
Authors: Yus Miguel , Foubelo Francisco , Ferrández José V
Published: September 2002

The DTBB-catalyzed lithiation of 4-hetero-substituted dibenzothiins (phenoxathiin, phenothiazine, and thianthrene) gives the corresponding functionalized organolithium intermediates, which by reaction with different electrophiles afford the expected functionalized thiols. The cyclization of some alcohol compound derivatives gives the corresponding homologous seven-membered dibenzo heterocycles.
Regio- and Stereoselective Synthesis of a trans-4-[60]Fullerenobisacetic Acid Derivative by a Tether-Directed Biscyclopropanation: A Diacid Component Applicable for the Synthesis of Regio- and Stereo-regular [60]Fullerene Pearl-Necklace Polyamides
Authors: Hino Tetsuo , Hamada Masahiro , Kinbara Kazushi , Saigo Kazuhiko
Published: September 2002

A trans-4-[60]fullerenobisacetic acid derivative was easily obtained from its diethyl ester, which was regio- and stereoselectively prepared by the biscyclopropanation of [60]fullerene with a tethered bis(α-bromophenylacetate) derivative. The polycondensation of the resultant fullerenobisacetic acid with aromatic diamines proceeded smoothly to give the corresponding regio- and stereo-regular [60]fullerene pearl-necklace polyamides in excellent yields.
Convergent and Convenient Total Synthesis of Phytoalexin-Elicitor Active Heptasaccharide by One-Pot Sequential Glycosylation
Authors: Mukaiyama Teruaki , Ikegai Kazuhiro , Hashihayata Takashi , Kiyota Koichi , Jona Hideki
Published: September 2002

Convergent and convenient total synthesis of branched hepta-β-glucoside 1 having phytoalexin-elicitor activity was efficiently accomplished by way of two one-pot sequential glycosylation reactions. Trisaccharide 8 was synthesized in high yield by TfOH-catalyzed one-pot glycosylation using three component monosaccharides and subsequent selective deprotection of a 6′-O-TBDPS group. The second one-pot glycosylation of trisaccharide 8 with the three monosaccharides smoothly proceeded to afford heptaglucoside 11 stereoselectively in 48% total yield based on monosaccharide 3. The targeted compound 1 was obtained in high yield after the removal of the protecting groups.
Ligand-assisted Solvothermal Growth of CdS Nanowires
Authors: Gao Feng , Lu Qingyi , Zhao Dongyuan
Published: September 2002

A simple ligand-assisted solvothermal process has been proposed to synthesize CdS nanowires with aspect ratio (average length/average diameter) up to 100. The simultaneous employment of two types of templates, coordinating solvent ethylenediamine (En) and ligand 8-hydroxyquinoline, has been found to be the key factor for the synthesis of one dimensional nanomaterials with high aspect ratio. By adjusting the concentration of the ligand, the produced one-dimensional nanomaterials can be elongated from 300 nm to 3.0 micrometers with unchanged diameter.
[Pt(CN)2·2Me3SnCN·2Me3SnOH·bpe]n (bpe=trans-1,2-bis(4-pyridyl)ethylene), the First Double-Sinusoidal Platinum-Tin Coordination Polymer
Authors: Chen Wanzhi , Fenghui Liu , You Xiaozeng
Published: September 2002

The coordination polymer [Pt(CN)2·2Me3SnCN·2Me3SnOH·bpe]n was prepared and structurally characterized by X-ray diffraction analysis which consists of one-dimensional double-sinusoidal chains.
Ta3N5 as a Novel Visible Light-Driven Photocatalyst (λ<600 nm)
Authors: Hitoki Go , Ishikawa Akio , Takata Tsuyoshi , Kondo Junko N , Hara Michikazu , Domen Kazunari
Published: September 2002

A transition metal nitride, Ta3N5, is a novel photocatalyst responding to visible light. Ta3N5 evolves H2 and O2 by visible light (λ<600 nm) irradiation in the presence of sacrificial electron donor and acceptor, respectively without any noticeable photo-anodic or cathodic corrosion, representing a candidate for overall water splitting by visible light.
Shift of the Iron Corrosion Potential and Acceleration of the Mass Transport of Dissolved Oxygen by the Micro-MHD Effect
Authors: Shinohara Kenji , Hashimoto Kazuhito , Aogaki Ryoichi
Published: September 2002

Change in the corrosion rate of iron under a high magnetic field was examined by determining corrosion potential shifts and polarization curve measurements. With increasing magnetic flux density, the electrode potential shifted to the anodic side. This was induced by a cathodic diffusion current increment via a microscopic stirring effect in the local magnetohydrodynamic flow, which arose from interaction between the electrochemical corrosion current and the applied magnetic field.
Reaction of Sulphate Radical Anion (SO4•-) with Cyanuric Acid: A Potential Reaction for Its Degradation?
Authors: Manoj P , Varghese R , Manoj V M , Aravindakumar C T
Published: September 2002

A novel reaction between sulfate radical anion (SO4•-) and cyanuric acid (CA), a non-degradable end product of the oxidative degradation of the triazine based herbicide, atrazine, is presented using laser flash photolysis and steady state radiolysis techniques at pH 5. A second order rate constant of 1.9×107 dm3 mol-1 s-1 has been determined and the transient intermediate (λmax=330 nm) is assigned to a radical cation of CA (CA•+). The degradation profile indicated that about 76% of CA have been decomposed after an absorbed γ-radiation dose of 18 kGy. It is therefore proposed that the reaction of SO4•- could be utilised for the degradation of CA in aqueous medium which is normally stable to any Advanced Oxidation Processes.
Zirconium Complexes Having Phenoxy/Cycloalkylimine Chelate Ligands for the Polymerization of Ethylene for Vinyl-Terminated Low Molecular Weight Polyethylenes
Authors: Ishii Sei-ichi , Mitani Makoto , Saito Junji , Matsuura Sadahiko , Kojoh Shin-ichi , Kashiwa Norio , Fujita Terunori
Published: September 2002

Zirconium complexes bearing phenoxy/cyclopropyl-, cyclobutyl- or cyclopentyl-imine chelate ligands, when activated with methylalumoxane (MAO), produced vinyl-terminated low molecular weight polyethylenes (Mw<5000) with higher activities than Cp2ZrCl2 at 25 °C. The complex having a cyclobutyl group provided the lowest molecular weight polyethylene (Mw 2100).
Enhanced Emission in Composite Multilayers of Amorphous TiO2-Gel and Eu3+ Ions
Authors: Sun Junqi , Ichinose Izumi , Takaki Rie , Nakao Aiko , Kunitake Toyoki
Published: September 2002

Ultrathin films of (TiO2/Eu3+)n and (TiO2/PAA/Eu3+)n composites were prepared by the surface sol-gel process and the subsequent chemisorption/coordination of Eu3+ ions. Amorphous TiO2-gel layers were found to act as sensitizer for efficient emission of Eu3+.
Selective Dimerization of Ethene over Lanthanide Catalysts Deposited from Eu or Yb Metal Solutions in Liquid Ammonia
Authors: Imamura Hayao , Kuhara Takumi , Furutachi Masataka , Sakamoto Takahiko , Sakata Yoshihisa
Published: September 2002

Europium and ytterbium catalysts obtained by impregnation of active carbon with lanthanide metal (Eu and Yb) solutions in liquid ammonia were found to be active for the dimerization of ethene. Ethene was selectively dimerized at 423–473 K to yield butene isomers with selectivity of 10–62%. The active catalysts were characterized as lanthanide nitride formed by the thermal decomposition of its amide.
Catalytic and Chemoselective Glycosylation between “Armed” and “Disarmed” Glycosyl p-Trifluoromethylbenzylthio-p-trifluoromethylphenyl Formimidates
Authors: Chiba Hiroyuki , Funasaka Setsuo , Kiyota Koichi , Mukaiyama Teruaki
Published: September 2002

Catalytic and chemoselective glycosylation between novel “armed” and “disarmed” glycosyl p-trifluoromethylbenzylthio-p-trifluoromethylphenyl formimidates was effectively performed in the presence of a catalytic amount of TfOH and MS 4A in CH2Cl2 at -78 °C. In addition, it was noted that highly 1,2-cis or 1,2-trans stereoselective synthesis was established when the above glycosylation was carried out at -78 °C in tBuOMe or EtCN, respectively.
Synthesis of Functionalized Cyclobutene Derivatives via Selective SN2’ Reaction of Dichlorocyclobutenes
Authors: Hamura Toshiyuki , Kakinuma Michiko , Tsuji Shinsuke , Matsumoto Takashi , Suzuki Keisuke
Published: September 2002

Dichlorocyclobutenone acetals, available via the cycloaddition of dichloroketene and alkynes followed by acetalization, undergo selective SN2’ attack by various nucleophiles to give a variety of functionalized cyclobutene derivatives in high yields.
Single Step Synthesis of Cyclooctadienone Derivatives by Reaction of Cyclobutenones with Dienyllithium
Authors: Hamura Toshiyuki , Tsuji Shinsuke , Matsumoto Takashi , Suzuki Keisuke
Published: September 2002

Various functionalized cyclooctadienones are accessible in high yields by the reaction of cyclobutenones with dienyllithium.
Steam Reforming of CH4 over Ni/Mg-Al Catalyst prepared by spc-Method from Hydrotalcite
Authors: Shishido Tetsuya , Wang Peng , Kosaka Tokuhisa , Takehira Katsuomi
Published: September 2002

The catalytic activity and stability for steam reforming of CH4 was studied on Ni/Mg-Al prepared by the solid phase crystallization (spc-) method. spc-Ni/Mg-Al showed higher activity than those prepared by the conventional impregnation method such as Ni/MgO or Ni/Al2O3. This catalyst also showed high stability even under a low steam to carbon ratio. The high and stable activity of spc-Ni/Mg-Al is caused by the formation of highly dispersed and stable Ni metals.
New Types of Oscillations in the BrO3--Serine-Mn2+-H2SO4 System
Authors: Li Hexing , Xu Yeping , Wang Minghui
Published: September 2002

A novel kind of oscillations was observed in the Ser-BrO3--Mn2+-H2SO4 system. Unlike other BZ oscillations, this kind of oscillations might be considered as radical-controlled rather than bromide-controlled because no substance subjected to bromination was present. The addition of acetone induced the dual-frequency oscillations, in which the radical-controlled oscillations appeared first following the bromide-controlled oscillations.
Sonogashira Coupling with Aqueous Ammonia
Authors: Mori Atsunori , Ahmed Mohamed S Mohamed , Sekiguchi Akitoshi , Masui Kentaro , Koike Tooru
Published: September 2002

The coupling reaction of terminal alkynes with organic halides, Sonogashira-(Hagihara) coupling, takes place with only 2 equivalents of dilute aqueous ammonia as an additive. The reaction of phenylacetylene and 4-iodoanisole in the presence of 1 mol% of PdCl2(PPh3)2, 2 mol% of CuI, and 2 equiv of aqueous ammonia in THF proceeds at room temperature for 6 h to afford the coupling product in a quantitative yield.
A One-Pot, Two-Step Enzymatic Synthesis of L-Lactic Acid from Acetaldehyde
Authors: Miyazaki Masaya , Ogino Kazuya , Shibue Mitsukuni , Nakamura Hiroyuki , Maeda Hideaki
Published: September 2002

A one-pot, two-step enzymatic synthesis of L-lactic acid from acetaldehyde and carbon dioxide has developed. The reaction was performed using a combination of reverse reaction of pyruvate decarboxylase and hydrogenation of pyruvate by lactic dehydrogenase. The maximum yield was obtained at pH 9.5.
Effect of Oxidation Treatment on Surface Fractal Dimension of Activated Carbon Fiber
Authors: Huang Zheng-Hong , Kang Feiyu , Yang Jun-Bing , Liang Kai-Ming , Zhao Hui , Dong Bao-Zhong
Published: September 2002

Viscose rayon based activated carbon fibers (ACFs) were oxidized in different ways, resulting in changes of surface fractal dimension, which might be found in ACFs with low and high specific surface areas treated under the same condition.
Effects of 1-Butanol on Emission Spectrum of 4-Phenyl-1-N,N-dimethylaminobutane in THF: Separation into Polar and Hydrogen-Bonding Interactions
Authors: Yamamoto Shunzo , Guobin Xie , Nakamura Mayuko , Sueishi Yoshimi
Published: September 2002

The effects of the addition of 1-butanol (BuOH), trichloroacetic acid (TCAA) and acetonitrile (AN) on the emission spectrum of 4-phenyl-1-N,N-dimethylaminobutane in THF have been studied. The results show that AN has only a polar effect and TCAA only a hydrogen-bonding (or protonation) effect, while BuOH has both effects. The relative magnitude of each effect was evaluated as a function of vol% of BuOH.
Kinetics of Base Catalyzed Chemiluminescence Reaction of Spiro[adamantane -1,3′-(4′-(m-hydroxyphenyl)-4′-methoxy-1′,2′-dioxetane)]
Authors: Wakasugi Takeshi , Fujimori Ken , Matsumoto Masakatsu
Published: September 2002

Our study of the kinetics of deprotonation and decomposition of spiro[adamantane-1,3′-(4′-(m-hydroxy-phenyl)-4′-methoxy-1′,2′-dioxetane)] (I) showed kinetic parameters for decomposition of tetrabutylammmonium salt of I to be ΔH‡=85.4±1.1 kJ mol-1; ΔS‡=16.0±3.5 J mol-1 K-1.
Electro-organic Synthesis of N-Hexyl Carbamate by Carbonylation of Methanol and Hexylamine with CO over Au Supported on Carbon Anode
Authors: Leon Roberto G de , Yamanaka Ichiro , Otsuka Kiyoshi
Published: September 2002

It has been found that Au anode, [AuBr3/AC+VGCF], showed the electro-catalysis for carbonylation of methanol, hexylamine and CO to 6-amino-hexyl-carbamic acid methyl ester (N-hexyl carbamate) using LiBr electrolyte.
Efficient Carbonylation of Methanol Catalyzed by Rhodium(I) Cyclooctadiene Complexes with Triphenylphosphinechalcogenide Ligands
Authors: Das Pankaj , Chutia Pratap , Dutta Dipak Kumar
Published: September 2002

Rhodium(I) complexes of the type, [Rh(COD)ClL] (COD=1,5-cyclooctadiene and L=Ph3PO, Ph3PS and Ph3PSe) have been synthesized. The complexes show higher efficiency as catalyst for carbonylation of methanol to acetic acid and methyl acetate at 130 °C and 15 bar pressure than the industrially used species [Rh(CO)2I2]-.
Synthesis of Thermally Stable Hexagonal Mesostructured Aluminophosphate-based Materials Modified with Organoalkoxysilanes
Authors: Kimura Tatsuo
Published: September 2002

Hexagonal mesostructured aluminophosphate (AlPO)-based materials with higher thermal stabilities have been successfully synthesized by the modification with organoalkoxysilanes.
A Novel Polyoxygenated Spirostanol Trisdesmoside from the Rhizomes of Helleborus orientalis
Authors: Watanabe Kazuki , Mimaki Yoshihiro , Sakuma Chiseko , Sashida Yutaka
Published: September 2002

A novel polyoxygenated spirostanol glycoside (1) was isolated from the rhizomes of Helleborus orientalis and its structure was determined by spectroscopic analysis, including extensive 1D and 2D NMR data, and the results of acid hydrolysis. The new glycoside (1) is unique in structure having oxygen atoms at C-1, C-3, C-21, C-23, and C-24 of the spirostanol skeleton and bearing a new acetylated tetraglycoside, a diglycoside, and a monosaccharide at C-1, C-21, and C-24 of the aglycon, respectively.
Preparation of Soluble π-Conjugated Poly(5,6-dialkoxy-1,10-phenanthroline-3,8-diyl)s. Their Stacking Behavior and Function as a π-Conjugated Polymer Ligand
Authors: Yamamoto Takakazu , Anzai Kazushige , Fukumoto Hiroki
Published: September 2002

Soluble π-conjugated poly(dialkoxyphenanthroline)s were prepared by organometallic polycondensation using a Ni(0) complex. Stacking structure, optical and electrochemical properties, and Ru complex forming reactivity of the polymer have been revealed.
Fluorometric Detection of p-Chlorophenol by ZnTPP-Intercalated Dialkyl Ammonium Smectite
Authors: Nagase Takako , Takahasi Yukiko , Suzuki Toshishige M , Ebina Takeo , Wakui Yoshito , Onodera Yoshio
Published: September 2002

Zn(II) tetraphenylporphyrin (ZnTPP)-intercalated dialkyl ammonium smectite was applied to the condensation and detection of chlorophenols in aqueous medium. ZnTPP and p-chlorophenol found to form a stable porphyrin-quinone dyad in micelles of dialkyl ammonium ion, accompanied with color-change and fluorescence quenching of ZnTPP. As a result, sub-ppm to ppm order of p-chlorophenol in water can be detected by the fluorescence quenching.
Hexagonal Corrosion Pattern upon Cleavage of a Zinc Single Crystal under a Vertical High Magnetic Field
Authors: Shinohara Kenji , Hashimoto Kazuhito , Aogaki Ryoichi
Published: September 2002

A two-dimensional hexagonal pattern was observed upon cleavage of a zinc single crystal after attack with sulfuric acid under a vertical high magnetic field. This phenomenon results from the formation of microscopic magnetohydrodynamic flow (micro-MHD flow) as microscopic vortexes, which interact with fluctuations of the reaction activity. The spatial pattern of the zinc surface is thought to be a result of the growth of fluctuation in the reaction activity about the zinc anodic dissolution, which was stabilized by the micro-MHD vortexes.
Synthesis and Properties of a Photoresponsive Azobenzene-Containing Hyperbranched Polymer
Authors: Wang Guojie , Cheng Hao , Wang Xiaogong
Published: September 2002

A hyperbranched polymer containing azobenzene chromophores has been synthesized and characterized. The photoresponsive properties of the hyperbranched azo polymer have been studied and compared with those of the monomers.
Nucleophilic Borylation of Benzyl Halides with Bis(pinacolato)diboron Catalyzed by Palladium(0) Complexes
Authors: Ishiyama Tatsuo , Oohashi Zengo , Ahiko Taka-aki , Miyaura Norio
Published: September 2002

Nucleophilic borylation of benzyl halides with bis(pinacolato)diboron in the presence of KOAc in toluene was effectively catalyzed by a palladium complex generated in situ from Pd(dba)2 and (4-MeOC6H4)3P, giving the corresponding pinacol benzylboronates in high yields.
Stereocontrolled OH Protection: Asymmetric Tetrahydrofuranylation
Authors: Nagano Hiroyuki , Katsuki Tsutomu
Published: September 2002

(ON+)(Salen)ruthenium(II) complex 1 was found to be an effective catalyst for asymmetric tetrahydrofuranylation of alcohols. The tetrahydrofuranylation of optically active alcohols was also successfully performed in a highly diastereoselective manner by taking advantage of double diastereodifferentiation.
Synthesis of Dihydropyrrole Derivatives by Copper-Catalyzed Cyclization of γ,δ-Unsaturated Ketone O-Methoxycarbonyloximes
Authors: Koganemaru Yohei , Kitamura Mitsuru , Narasaka Koichi
Published: September 2002

2-Bromomethyl-3,4-dihydro-2H-pyrroles are prepared from γ,δ-unsaturated ketone O-methoxycarbonyloximes by treatment with a catalytic amount of CuBr•SMe2 and LiBr.
The Interaction of Aldolase with the Cytoplasmic Domain of Human Erythrocyte Band 3 Inhibited by Lanthanum Ions
Authors: Zheng Yujuan
Published: September 2002

The effect of lanthanum ions on the activity of the cytoplasmic domain of human erythrocyte band 3 (CDB3), which was measured according to the inhibition to aldolase, was studied. In the presence of low concentration of lanthanum ions, the function of CDB3 to inhibit aldolase activity decreased significantly. It indicated that lanthanum ions in the erythrocyte would change the conformation of CDB3 and influence the control on aldolase activity.
Anomalous Laser Photophoretic Behavior of Photo-Absorbing Organic Droplets in Water
Authors: Monjushiro Hideaki , Takeuchi Kaori , Watarai Hitoshi
Published: September 2002

Laser photophoretic behavior of 2-benzylpyridine droplets including molybdenum blue as a photo-absorber was examined in water by irradiating with a cw Nd:YAG laser (1064 nm). The photophoretic velocity of the droplet decreased with increasing its absorptivity. The droplets smaller than 1.5 μm in radius with high absorptivity migrated in the opposite direction against the laser irradiation. This is the first observation of the negative photophoresis in liquid media.
Reaction of Yb-Imine Complexes with Isocyanates. Novel Synthesis of α-Aminoacetamides
Authors: Ueno Ryoma , Yano Kohei , Makioka Yoshikazu , Fujiwara Yuzo , Kitamura Tsugio
Published: September 2002

Yb(II)-imine complexes, prepared from Yb metal and aromatic imines in THF and HMPA, reacted with isocyanates to give α-aminoacetamides. This method provides a novel synthetic route to α-amino-substituted acetamide derivatives.
Rate Constant for the Reaction of OH Radicals with Isoprene at 298±2 K
Authors: Iida Yumi , Obi Kinichi , Imamura Takashi
Published: September 2002

Using the relative-rate technique, the rate constant for the reaction of OH radicals with isoprene was determined in one atmosphere of air at 298±2 K. Methyl nitrite photolysis in air was used as a source of OH radicals. Ozone and O-atom reactions with isoprene were confirmed to have a negligible contribution on the loss of isoprene. The rate constant relative to three reference compounds yielded (10.4±0.4)×10−11 cm3 molecule−1 s−1 (the uncertainty is 2σ).
Synthesis of Poly(aryl ether) by Pd-Catalyzed Polycondensation
Authors: Shibasaki Yuji , Ueda Mitsuru
Published: September 2002

High molecular weight poly(aryl ether)s were successfully prepared by the Pd-catalyzed polycondensation of 2,2-bis(4-hydroxy-3-methylphenyl)propane (I) with 4,4′–dibromobiphenyl (II). The polycondensation proceeded in toluene in the presence of 4 mol% Pd(OAc)2, 6 mol% 2-(di-tert-butylphosphino)biphenyl, and 6 equiv K3PO4 at 90 °C for 24 h, giving the polymer with a number-average molecular weight (Mn) of 18000. The resulting polymers were fully characterized by IR and NMR spectroscopies.
Nucleophilic O-Transfer, Cyclizaton, and Decarboxylation of Carbonyl Oxide Intermediate in the Reaction of Stable Imidazolylidene and Singlet Oxygen
Authors: Ishiguro Katsuya , Hirabayashi Kenji , Nojima Takayuki , Sawaki Yasuhiko
Published: September 2002

The 1O2 oxidation of 1,3-dialkylimidazol-2-ylidene (alkyl=tert-butyl) resulted in the formation of a carbonyl oxide intermediate which was shown to react as a nucleophilic O-transer and to cyclize to an unstable dioxirane intermediate leading to, as final products, bis-imine RN=CH–CH=NR and carbene-CO2 adduct.
Absorption and Desorption Behavior of Ammonia with Alkali Earth Halide and Mixed Halide
Authors: Liu Chun Yi , Aika Ken-ichi
Published: September 2002

Alkali earth metal halides were studied for the use as ammonia storage material operated below 60 kPa. Reversible and irreversible absorption were observed for each samples. MgCl2, CaCl2, and CaBr2 were found to be adequate for TSA method (between 298 and 473 K), and these storage capacities were much higher than that of Na–Y zeolite. CaCl2–CaBr2 mixed halides proved to be a useful material with large absorption for PSA cycling between 10 and 60 kPa of ammonia.
Efficient Chiral Amidophosphine Ligand for Copper-catalyzed Asymmetric Addition of Diethylzinc to N-Sulfonylimines
Authors: Nagai Kazushige , Fujihara Hidetaka , Kuriyama Masami , Yamada Ken-ichi , Tomioka Kiyoshi
Published: September 2002

Structure study of a chiral amidophosphine ligand for copper-catalyzed asymmetric addition reaction of diethylzinc with the N-tosylimine reached to the new chiral phosphine bearing the bulky substituent on the pyrrolidine ring, which significantly improved catalytic performance to give the adduct in 96% yield and 93% ee after 3 h.
Surface pKa of Amine-Terminated Self-assembled Monolayers Evaluated by Direct Observation of Counter Anion by FT-Surface Enhanced Raman Spectroscopy
Authors: Nishiyama Katsuhiko , Kubo Atsushi , Ueda Akihiro , Taniguchi Isao
Published: September 2002

The acid–base reaction of aminoethanethiol (2AT) and 6-amino-1-hexanethiol (6AT) self-assembled monolayers (SAMs) on a gold electrode was monitored by Fourier-transform surface enhanced Raman spectroscopy (FT-SERS). A band attributed to counter anions, such as ClO4- or NO3- for NH3+, was clearly observed during protonation of the amino group of 2AT or 6AT. The band intensity decreased with increasing solution pH. The surface pKa’s of the 2AT and 6AT SAMs on a gold electrode at 0 V vs Ag|AgCl (saturated KCl) were 5.0±0.2 and 3.8±0.3, as evaluated from the intensity–pH curve.
A Novel Noninterpenetrated Open Framework Structure with Extraordinarily Large Cavity Sizes: A New Coordination Polymer Containing a Rigid and Bent Molecular Building Block
Authors: Shin Dong Mok , Lee In Su , Chung Young Keun
Published: September 2002

A new coordination polymer is prepared from Co(SCN)2 and 1,3-bis(trans-4-styrylpyridiyl)benzene and characterized by X-ray diffraction studies, which shows a noninterpenetrated framework structure containing extraordinarily large cavities and channels.
Photochemical Generation of Chlorine-substituted Digermenes and Their Rearrangement to Germylgermylenes
Authors: Fukaya Norihisa , Sekiyama Hiroshi , Ichinohe Masaaki , Sekiguchi Akira
Published: September 2002

Photolysis of cis,trans-1,2,3-trichloro-1,2,3-tris(tri-tert-butylsilyl)cyclotrigermane and trans-1,2-dichloro-3-methyl-1,2,3-tris(tri-tert-butylsilyl)cyclotrigermane in the presence of triethylsilane yielded products arising from a germylgermylene, which is formed by the 1,2-chlorine migration on digermenes.
A Novel Layered Zirconium Phosphate [NH4]2[Zr(OH)3(PO4)] Synthesized through Non-aqueous Route
Authors: Wang Dan , Yu Ranbo , Kumada Nobuhiro , Kinomura Nobukazu , Yanagisawa Kazumichi , Matsumura Yasuyuki , Yashima Tatsuaki
Published: September 2002

A novel layered zirconium phosphate [NH4]2[Zr(OH)3(PO4)] has been synthesized by using nonaqueous method in an ethylene glycol medium. The as-synthesized product was further characterized by means of single-crystal and powder X-ray diffractions, TG-DTA, CHN elemental analysis, and IR. The compound consists of macroanionic layers of [ZrPO7H3]2− separated by NH4+ cations.
Preparation and Separation Performance of a TPAOH-Induced ANA Zeolite Membrane
Authors: Liu B S , Au C T
Published: September 2002

An ANA-type zeolite membrane with good H2/C3H8 permselectivity has been prepared on an γ-Al2O3/α-Al2O3 support by in situ hydrothermal synthesis under the induction of tetrapropylammonium hydroxide (TPAOH).
Photochemistry of Pyracyloquinone Studied by Laser Flash Photolysis with UV/VIS and IR Detection
Authors: Oishi Shigero , Urabe Tomoko , Kotake Rika
Published: September 2002

Direct evidence for the existence of an intermediate bisketene (Φ=0.14, ε575=2300 M−1 cm−1), generated from pyracyloquinone, was obtained by laser flash photolysis with UV/VIS and IR detection. The bisketene was found to react with DMSO to give acenaphthylene-5,6-dicarboxylic anhydride and dimethyl sulfide, quantitatively.
A High-Yielding and Convenient Synthesis of Rotaxane Based On an Ester Forming Capping Methodology
Authors: Tokunaga Yuji , Kakuchi Suzuka , Akasaka Koichiro , Nishikawa Naoki , Shimomura Youji , Isa Kimio , Seo Toshihiro
Published: September 2002

An efficient method for preparation of rotaxanes, involving hydrogen bonding guided self-assembly and diaryldiazoalkanes ester forming end-capping of pseudorotaxanes, is described. The end-capping reactions proceed under mild conditions and furnish the expected rotaxanes in excellent yields.
Adsorption of Phenols onto 1,1′-Dimethyl-4,4′-bipyridinium-smectites
Authors: Okada Tomohiko , Ogawa Makoto
Published: September 2002

Adsorption of phenols (phenol and 2-naphthol) onto the 1,1′-dimethyl-4,4′-bipyridinium (methylviologen:MV2+)-smectite intercalation compounds, which were synthesized by ion exchange reactions, led to the change in the color and the basal spacing. The color change was ascribed to the formation of charge-transfer complex of MV2+ and phenols. The increase in the basal spacing by the reaction with phenols indicates a change in the interlayer microstructure.
Highly Effective Removal of Arsenate and Arsenite Ion through Anion Exchange on Zirconium Sulfate-Surfactant Micelle Mesostructure
Authors: Iwamoto Masakazu , Kitagawa Hirokazu , Watanabe Yoshimasa
Published: September 2002

The zirconium sulfate-surfactant micelle mesostructure (ZS) works as an excellent anion exchanger to remove arsenic ion in an aqueous solution. The amounts of As trapped in ZS reached to 1.8 mol/mol-Zr.
Fixation of Carbon Dioxide into Polysilsesquioxane Containing Glycidyl Groups
Authors: Yamamoto Shin-ichi , Hayashi Toshiyuki , Kawabata Katsuyuki , Moriya Osamu , Endo Takeshi
Published: September 2002

Fixation of carbon dioxide into the polysilsesquioxane containing glycidyl groups proceeded in the presence of a catalytic amount of tetrabutylammonium salts under atmospheric pressure, in which the solid phase reaction was notably effective for the transformation of oxirane groups into cyclic carbonate groups on the polysilsesquioxane.
Reactions of 2-Germanaphthalene with Elemental Sulfur and Selenium: Synthesis of Novel Cyclic Polychalcogenides Containing a Germanium, Trichalcogenagermolanes
Authors: Nakata Norio , Takeda Nobuhiro , Tokitoh Norihiro
Published: September 2002

Novel five-membered cyclic trichalcogenides containing a germanium atom were synthesized by the reactions of a kinetically stabilized 2-germanaphthalene with elemental sulfur and selenium, and the molecular structure of the triselenide was determined by X-ray crystallographic analysis.
A New and Convenient Method for the Preparation of Cyclooctanone Containing Bis-Aldol Skeleton by Samarium(II) Iodide-mediated Intramolecular Aldol Cyclization of ω-Oxiranyl Keto Octanal
Authors: Pudhom Khanitha , Arai Hidehiro , Yamane Keiko , Mukaiyama Teruaki
Published: September 2002

A polyoxy eight-membered ring compound containing a bis-aldol skeleton, 2,6-dibenzyloxy-3-(t-butyldimethylsiloxy)-7-hydroxy-8-hydroxymethyl-5-(p-methoxybenzyloxy)-4,4-dimethylcyclooctanone 1, a key synthetic intermediate of 19-hydroxypaclitaxel, was prepared in high yield from 2,6-dibenzyloxy-5-(t-buthyldimethylsiloxy)-3-(p-methoxybenzyloxy)-4,4-dimethyl-8,9-oxiranyl-7-oxononanal 6 by the samarium(II) iodide-mediated intramolecular aldol cyclization.
A “Chemical-Scissors-Assemble” Route to Titanium Carbide Nanorods
Authors: Wang Xinjun , Lu Jun , Gou Pingping , Xie Yi
Published: September 2002

By using tetrachloroethylene (C2Cl4), metallic titanium powders and N-containing nucleophilic solvents, such as ethylenediamine (en), pyridine and diethylamine as raw materials, a new strategy, called “chemical-scissors-assemble” route, is explored to prepare TiC nanorods, in which nucleophilic solvent attacks at the carbon in tetrachloroethylene to remove the chlorine groups and produce free C2, which can assemble into one-dimensional conjugate carbon chain clusters, and then react with Ti powders and result in a one-dimensional structure of TiC nanorods.
Synthesis and Electrochemical Properties of Yttrium-doped Spinel LiMn2−yYyO4 Cathode Material
Authors: Tang Hao , Feng Chuan Qi , Fan Quan , Lei Tai Ming , Sun Ju Tang , Yuan Liang Jie , Zhang Ke Li
Published: September 2002

Yttrium doped spinel LiMn2−yYyO4 with single phase was synthesized and characterized. The data of the XRD show that the limit for Y solubility is y≤0.02. The beneficial effect of Y is evident by way of improved cyclability. The electrode of LiMn1.98Y0.02O4 shows excellent electrochemical properties with a first discharge capacity of 118 mA·h·g−1 and retaining 98% of the initial capacity after 100 cycles at the current rate 0.2 C.
A Novel Diphenylmaleimide Dye for Fluorescence Photopatterned Images
Authors: Yang Nam Choul , Choi Ho Wook , Lee Jun Kyu , Hwang Jo Il , Suh Dong Hack
Published: September 2002

A novel fluorescent diphenylmaleimide dye, 1–BOC, can be converted into non–fluorescent 1–OH by the deprotection of the tert–butyloxycarbonyl group of 1–BOC with photogenerated acid, which makes 1–BOC of an useful material for fluorescence images patterned by a photolithographic method based on chemical amplification concept.
Vacuum-Ultraviolet Circular Dichroism of Amino Acids as Revealed by Synchrotron Radiation Spectrophotometer
Authors: Matsuo Koichi , Matsushima Yosuke , Fukuyama Takayuki , Senba Shinya , Gekko Kunihiko
Published: September 2002

We succeeded in constructing a vacuum-ultraviolet circular dichroism (VUVCD) spectrophotometer with a small-scale synchrotron radiation source (0.7 GeV) at Hiroshima Synchrotron Radiation Center (HiSOR). This VUVCD system revealed for the first time the CD spectra of amino acids in aqueous media in the 310–140 nm region under high vacuum. These data, which cannot be observed by any types of existing CD spectrophotometers, now open a new field in the structural analysis of biomaterials on a basis of the higher energy transition of chromophores.
Novel Catalysts for Carbon Dioxide-induced Selective Conversion of Methane to C2 Hydrocarbons
Authors: Cai Yingchun , Chou Lingjun , Li Shuben , Zhang Bing , Zhao Jun
Published: September 2002

The combination of Mn with BaCO3 leads to active catalysts for carbon dioxide-induced selective conversion of methane to ethane and ethylene in the absence of oxygen.
Stereoselectivity in the Fe(II)/Cu(II)-mediated Homolytic Decomposition of the cis- and trans-Isomers of Pinane Hydroperoxide
Authors: Lempers H E B , Sheldon R A , Swift K A D
Published: September 2002

The outcome of the FeSO4/CuSO4-mediated homolytic decomposition of 2,6,6-trimethylbicyclo[3.1.1]heptane-2-hydroperoxide (pinane hydroperoxide, PHP) was found to be markedly dependent on its stereochemical configuration. The cis-isomer gave exclusively 1-(2,2-dimethyl-3-vinylcyclobut-1-yl)ethanone via beta-scission of the intermediate alkoxy radical followed by oxidation of the ensuing alkyl radical by CuSO4. In contrast, trans-PHP afforded the tricyclic ether 1,4-dimethyl-3-oxatricyclo[5.2.0.0 4,9]nonane, via intramolecular hydrogen abstraction and CuSO4 oxidation of the resulting alkyl radical, as the major product.
Crystal Structure and Magnetic Properties of Two-dimensional Cyanide-bridged Bimetallic Assembly Composed of CsI[MnII(3-cyanopyridine)2{WV(CN)8}]·H2O
Authors: Arimoto Yoichi , Ohkoshi Shin-ichi , Zhong Zhuang Jin , Seino Hidetake , Mizobe Yasushi , Hashimoto Kazuhito
Published: September 2002

We have synthesized a two-dimensional manganese(II) octacyanotungstate(V)-based ferrimagnet with a magnetic ordering temperature of 35 K. Single crystal analysis showed that MnII ion was axially capped by 3-cyanopyridines, forming a two-dimensional structure. This bimetallic assembly showed ferrimagnetic properties due to the antiferromagnetic interaction between magnetic orbitals of dz2 on WV ion and dx′y′ on MnII ion in the inside of the two dimensional layer.
Host-Guest Electron Transfer between Intercalated Co(II)-Tetraphenylporphine Tetrasulfonate and Mg–Fe(III) Layered Double Hydroxides
Authors: Shichi Tetsuya , Tong Zhiwei , Hirai Shu , Takagi Katsuhiko
Published: September 2002

An electron transfer between Fe(III) of Mg–Fe(III) LDH (Layered Double Hydroxide) and Co(II)TPPS (cobalt(II)-tetraphenylporphine tetrasulfonate) as the guest was investigated. With a low coverage of the guest, the electron transfer occurred during the adsorption process to form an intercalation hybrid. On the other hand, light irradiation (>400 nm) of the hybrid powder resulted in a reverse electron transfer to Co(II)TPPS/Mg–Fe(III) LDH. Structural changes in the laminating hybrid were observed to take place concurrently with the electron transfers.
Low Pressure Hydroformylation in the Presence of Alcohol Promoters
Authors: Li Baitao , Li Xiaohong , Asami Kenji , Fujimoto Kaoru
Published: September 2002

Active carbon supported cobalt catalyst was studied for the hydroformylation of 1-hexene in the presence of alcohol solvents at low pressure. The influence of various solvents on the hydroformylation and the CO conversion vs time on stream were investigated in detail. It was found that the heterogeneous catalyst shows excellent activity only in the alcohol solvents.
Reduction of Nitrate and Nitrite Ions over Ni-ZnS Photocatalyst under Visible Light Irradiation in the Presence of a Sacrificial Reagent
Authors: Hamanoi Osamu , Kudo Akihiko
Published: September 2002

Ni-doped ZnS photocatalysts (Zn0.999Ni0.001S) with a 2.4 eV energy gap showed activities for the reduction of nitrate and nitrite ions to nitrite, ammonia, and dinitrogen under visible light irradiation (λ>420 nm) in the presence of methanol as a reducing reagent. The reduction of nitrate ions competed with that of water to form dihydrogen. The concentration of nitrate ions and loading a platinum cocatalyst affected the selectivity for the reduction products of nitrate ions.
A Novel Spinel-Type Co/Mn Catalyst for Methane Oxidation at Low Temperatures
Authors: Li Weibin , Lin Ying
Published: September 2002

A Spinel-type Co/Mn catalyst prepared in a sol-gel process has been investigated for catalytic oxidation of methane. The reaction activity was significantly improved by either pretreating the catalyst in the presence of water vapor or addition of water vapor into the feed gas. XPS spectra show that the oxidation activity was closely related with surface Co species and the intensity ratio of lattice oxygen to adsorbed oxygen on the sample.
Novel Alkoxo-Bridged Lanthanide(III) Dinuclear Complexes: Crystal Structure of Na4[Yb2(μ-dpta-O)2] (H4dpta-OH=1,3-Diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid)
Authors: Miyashita Yoshitaro , Sanada Masateru , Yamada Yasunori , Fujisawa Kiyoshi , Okamoto Ken-ichi
Published: September 2002

Novel alkoxo-bridged lanthanide(III) dinuclear complexes Na4[Ln2(μ-dpta-O)2] (Ln=GdIII, HoIII, and YbIII; H4dpta-OH=1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid) were prepared and characterized. X-ray analysis for the Yb(III) complex indicated that each Yb atoms, which is surrounded by four terminal O atoms from carboxylate, two bridged O atoms from alkoxo, and two N atoms in two different dpta-O ligands, is situated in an eight coordinate geometry.
Observation of Energy-Filtered Image for X-Ray Photoemission Electron Microscopy (EXPEEM) Using a Retarding Wien-Filter Energy Analyzer
Authors: Yasufuku Hideyuki , Ohminami Yusuke , Tsutsumi Tetsuya , Asakura Kiyotaka , Kato Makoto , Sakai Yuji , Kitajima Yoshinori , Iwasawa Yasuhiro
Published: September 2002

We observed surface images of the Au islands periodically deposited on a Ta sheet by means of an energy-filtered XPEEM using a retarding Wien-filter energy analyzer and a high energy X-ray. By changing the passing photoelectron kinetic energy (Ekin), we had a brighter Au island image at the Ekin=0 eV and 60 eV while we had a brighter Ta substrate image at Ekin=102 eV, corresponding to a Ta 3p3/2 photoelectron peak.
Structures and Magnetic Properties of Di and Tetranuclear Nickel(II) Complexes with Schiff Base Ligands
Authors: Hoshino Norihisa , Ito Tasuku , Nihei Masayuki , Oshio Hiroki
Published: September 2002

Reactions of Ni(CH3COO)2·4H2O and NiCl2·6H2O with Schiff base ligands yielded di and tetranuclear nickel(II) complexes of [Ni2(Hhsae)2(CH3COO)2(MeOH)2] (1) and [Ni4(sae)4(MeOH)4] (2) (H2hsae=2-(5-hydroxysalicylideneamino)ethanol and H2sae=2-salicylideneaminoethanol). Magnetic susceptibility measurements revealed that 1 and 2 have singlet and nonet spin ground states, respectively.
Highly Enantioselective Intramolecular Cyclopropanation of Alkenyl Diazo Ketones Using Ru(salen) as Catalyst
Authors: Saha Biswajit , Uchida Tatsuya , Katsuki Tsutomu
Published: September 2002

Intramolecular cyclopropanation of alkenyl diazoketones was found to proceed in a highly enantioselective manner by using optically active (nitroso)(salen)ruthenium(II) complex 1 as the catalyst under photo-irradiation.
Molecular Assembly of Zinc–Nickel Hybrid Porphyrin Dimer Using Synthetic 4α-Helix Polypeptides
Authors: Takeuchi Yoshito , Watanabe Hiroyuki , Kashiwada Ayumi , Nagata Morio , Ohtsuka Toshiaki , Nishino Norikazu , Kawai Hideki , Nagamura Toshihiko , Kurono Yukihisa , Oku Naoto , Nango Mamoru
Published: September 2002

Molecular assembly of hybrid porphyrin dimer containing zinc and nickel mesoporphyrins using synthetic 4α-helix polypeptides induced an efficient energy-transfer between the porphyrins due to the presence of the polypeptide.
Olefin Metathesis over Mesoporous Alumina-supported Rhenium Oxide Catalyst
Authors: Onaka Makoto , Oikawa Takashi
Published: September 2002

Rhenium oxide finely dispersed on mesoporous alumina with uniform pore size was found to be a more active and selective catalyst for liquid-phase metathesis reactions of terminal and inner olefins than rhenium oxide on normal γ-alumina with random pore shape.
Direct Synthesis of Hydrogen Peroxide (>1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System
Authors: Yamanaka Ichiro , Hashimoto Toshihide , Otsuka Kiyoshi
Published: September 2002

A higher concentration of H2O2 solution (>1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.
Synthesis of CeO2 Spherical Fine Particles by Homogeneous Precipitation Method with Polyethylene Glycol
Authors: Uekawa Naofumi , Ueta Masayuki , Wu Yong Jun , Kakegawa Kazuyuki
Published: September 2002

CeO2(IV) fine particles were prepared by heating a polyethylene glycol solution of Ce(NO3)3·6H2O at 383 K for 3 h. When a polyethylene glycol whose molecular weight was 7500 or 20000 was used for the preparation, the obtained CeO2 particles were almost monodispersed.
Spin Structure and Dynamics in a Spin 1/2 One Dimensional Antiferromagnet, [NiBr(chxn)2]Br2 (chxn: 1R,2R-cyclohexanediamine)
Authors: Takaishi Shinya , Kano Masataka , Kitagawa Hiroshi , Furukawa Yuji , Kumagai Ken-ichi , Ikeda Ryuichi
Published: September 2002

The 1H NMR spin-lattice relaxation time T1 in a spin 1/2 1-D antiferromagnetic complex [NiBr(chxn)2]Br2 was observed down to 1.8 K. The observed T1 temperature dependence was well reproduced by the Sachdev’s treatment giving an exchange interaction energy (J) of ca. 2500 K. 1-D spin migration assignable to paramagnetic electrons in impurity amounts of NiII sites was observed at low temperatures.
Lithium Pyrrolidone Catalyzed Aldol Reaction between Aldehyde and Trimethylsilyl Enolate
Authors: Fujisawa Hidehiko , Mukaiyama Teruaki
Published: September 2002

Lithium pyrrolidone catalyzed aldol reaction between trimethylsilyl enolates and aldehydes proceeded smoothly in a DMF or pyridine solvent to afford the corresponding aldols under weakly basic conditions.
Heterogeneous Photo-Fenton Degradation of an Azo Dye in Aqueous H2O2/Iron Oxide Dispersions at Neutral pHs
Authors: He Ju , Tao Xia , Ma Wanhong , Zhao Jincai
Published: September 2002

The photodegradation of Mordant Yellow 10 (MY10), a kind of azo dye, in aqueous dispersions of H2O2/hematite (α-Fe2O3), goethite (α-FeOOH) and akaganeite (β-FeOOH) at neutral pHs under UV-light irradiation was examined. The fastest degradation rate of MY10 was obtained with goethite. The formation of •OH in the photoreaction process was detected by ESR spin-trapping technique. A possible mechanism of heterogeneous photo-Fenton reaction was proposed.
First Asymmetric Photosensitization in Supercritical Fluid. Exceptionally High Pressure/Density Dependence of Optical Yield in Photosensitized Enantiodifferentiating Isomerization of Cyclooctene
Authors: Saito Ryota , Kaneda Masayuki , Wada Takehiko , Katoh Akira , Inoue Yoshihisa
Published: September 2002

The photosensitized enantiodifferentiating isomerization of (Z)-cyclooctene (1Z) in supercritical carbon dioxide has been performed for the first time. The critical control of the enantiomeric excess (ee) of chiral product, (E)-cyclooctene (1E), and even the switching of the product’s chirality were achieved through a small change of pressure particularly in the low-density region near the critical density. Quantitative evaluation of these ee changes was achieved by estimating differential activation volumes between the diastereomeric transition states of the reaction.
Fabrication of Hierarchical Structured Zeolitic Materials through Vapor-phase Transforming of the Seeded Diatomite
Authors: Wang Yajun , Tang Yi , Wang Xingdong , Shan Wei , Dong Angang , Ren Nan , Gao Zi
Published: September 2002

Here, we report a new simple approach to the preparation of hierarchical structured zeolites through transforming the seeded diatomaceous silica into zeolite by vapor-phase transport (VPT) method. The morphology and macro-porosity of the diatomite are well preserved even in the samples with zeolite content higher than 50%. The products possess high mechanical strength and hydrothermal stability.
Enhanced Photocurrent of Dye-Sensitized Solar Cells by Modification of TiO2 with Carbon Nanotubes
Authors: Jung Kyoung-hwa , Hong Jin Sup , Vittal R , Kim Kang-Jin
Published: September 2002

The effect of incorporating single-wall carbon nanotubes in TiO2 film electrodes on the properties of dye-sensitized solar cells was studied. Compared with an unmodified solar cell, it is observed that the short-circuit photocurrent (Jsc) of the modified solar cells increases while the open-circuit photovoltage decreases slightly. The enhanced Jsc is correlated with increased electrical conductivity, light scattering and concentration of free conduction band electrons.
Efficient Synthesis of a Donor-Acceptor Phthalocyanine Having Adjacently-Fused Pyrazine Rings
Authors: Fukuda Takamitsu , Kobayashi Nagao
Published: September 2002

Condensation reaction of 3,6-diphenylphthalonitrile and 2,3-dicyano-5,6-diethyl-1,4-pyrazine employing the modified lithium method has efficiently produced the novel donor-acceptor phthalocyanine derivatives having adjacently-fused pyrazine rings.
Ruthenium Oxyl Radical Complex Containing o-Quinone Ligand Detected by ESR Measurements of Spin Trapping Technique
Authors: Kobayashi Katsuaki , Ohtsu Hideki , Wada Tohru , Tanaka Koji
Published: September 2002

Ruthenium-quinone complex containing an aqua ligand, [RuII(trpy)(35tBu2Q)(OH2)](ClO4)2 (trpy=2,2′:6′,2″-terpyridine, 35tBu2Q=3,5-di-tert-butyl-1,2-benzoquinone) underwent deprotonation of an aqua ligand accompanied with intramolecular electron transfer from O2− ligand to quinone ligand generating O•− ligand.
A New Process for Producing Ca/Mg Acetate Deicer with Ca/Mg Waste and Acetic Acid Produced by Wet Oxidation of Organic Waste
Authors: Jin Fangming , Kishita Atsushi , Moriya Takehiko , Enomoto Heiji , Sato Naohiro
Published: September 2002

A new process for producing calcium magnesium acetate (CMA) deicer with acetic acid, produced by wet oxidation of organic wastes, and Ca/Mg wastes is proposed. Four kinds of representative organic waste were used as low-cost raw materials, for production of acetic acid, which was then converted to CMA by mixing with a Ca/Mg source such as oyster shells and industrial Mg wastes. The conversion efficiencies to acetic acid and from acetic acid to CMA achieved 14–16% and higher than 99%, respectively.
Novel Synthesis and Thermal Ring Fission of 7-Aryl-1,2,3,4,5,7-pentathiazocanes
Authors: Shimada Kazuaki , Yoshida Takamasa , Makino Kenshiro , Otsuka Tatsuya , Onuma Yuki , Aoyagi Shigenobu , Takikawa Yuji , Kabuto Chizuko
Published: September 2002

Treatment of 1,5,3,7-dithiadiazocanes 1 with bromine-elemental sulfur or disulfur dichloride (S2Cl2) afforded 1,2,3,4,5,7-pentathiazocanes 3, and heating of 3 caused unusual thermal ring fission to give an inseparable mixture of polysulfide chains bearing a thioformamide moiety on each terminal.