bluuebunny/crossref_metadata_2025 huggingface dataset:
Aniline-Hydroxylase Activity of Myoglobin by Coupling with a Membrane-Bound Electron Transport System
Authors: Hamachi Itaru , Fujita Akio , Kunitake Toyoki
Published: March 2006

Aniline-hydroxylase activity of myoglobin (Mb) can be induced by a rationally assembled semi-artificial multienzyme system of NADH - FMN - Mb on a synthetic bilayer membrane.
Synthesis and Structure of Hexacoordinate Organosilicon Compounds Having Tropolonato Ligands
Authors: Kira Mitsuo , Zhang Luo Cheng , Kabuto Chizuko , Sakurai Hideki
Published: March 2006

R2SiT2 type of compounds (R = alkyl, aryl, OMe; T = tropolonato) have been found to hold rather exceptionally hexacoordinate dialkyl- and diarylsilicon geometry with two bidentate tropolonato ligands both in the solid state and in solution. A facile intramolecular stereoisomerization of these neutral hexacoordinate silicon compounds was observed by temperature dependent NMR spectroscopy in solution.
Formation and Characterization of Pz3Cu(II) - Fe(III) Porphyrin Complex as a Structural Model of Cytochrome c Oxidase
Authors: Sasaki Takao , Naruta Yoshinori
Published: March 2006

Porphyrins with tripyrazolyl ligand (Pz3) can form a heteronuclear complex to take advantage of the difference of the coordination strength between two ligands. We synthesized an iron(III) porphyrin-copper(II) complex, which was characterized by means of UV-vis, ESR and MS spectroscopies in comparison with the parent iron(III) porphyrin.
Lanthanide Complexes with High Stability and Efficiency for the Hydrolysis of a Ribonucleotide Dimer
Authors: Yashiro Morio , Ishikubo Akira , Takarada Tohru , Komiyama Makoto
Published: March 2006

Lanthanide complexes with N,N,N′,N′-tetrakis[(2-pyridyl)methyl]ethylenediamine (TPEN) efficiently hydrolyze a ribonucleotide dimer, ApA, at 35 °C, pH = 7.2. The activity of La3+-TPEN is greater than that of free La3+ ion. The Ln3+-TPEN complexes are sufficiently stable in neutral aqueous solutions (the formation constants are in the range log K/mol−1 dm3 = 3.9 - 6.2). These complexes are promising for the active site of artificial ribonucleases.
Ultrasonic Effects on Electroorganic Processes. Electroreduction of Benzaldehydes on Ultrasound-vibrating Electrodes
Authors: Atobe Mahito , Nonaka Tsutomu
Published: March 2006

Ultrasound-vibrators (stepped horns) themselves were used as cathodes for electroreduction of benzaldehydes. Current efficiency for the reduction and selectivity for the corresponding hydrodimeric products (HD) were increased with increase in ultrasound-oscillating power.
Silylative Dimerization of Aromatic Aldehydes Catalyzed by a Thiolate-Bridged Diruthenium Complex
Authors: Shimada Hitoshi , Qü Jing-Ping , Matsuzaka Hiroyuki , Ishii Youichi , Hidai Masanobu
Published: March 2006

A cationic thiolate-bridged diruthenium complex [Cp*RuCl-(μ2-SPri)2RuCp*][OTf] (Cp* = η5-C5Me5, OTf = OSO2CF3) was found to be an efficient catalyst for the reaction of aromatic aldehydes with hydrosilanes in acetonitrile to give 1,2-diaryl-1,2-disiloxyethanes as the major products.
Catalytic Addition of Aromatic C–H Bonds to Acetylenes
Authors: Kakiuchi Fumitoshi , Yamamoto Yoshimi , Chatani Naoto , Murai Shinji
Published: March 2006

The reaction of α-tetralone with various internal acetylenes can be catalyzed by Ru(H)2(CO)(PPh3)3 and gives 1:1 addition products. Symmetrically substituted dialkyl- and diarylacetylenes gave an E/Z mixture of 1:1 coupling products in good yields. 1-Phenyl-1-butyne afforded all four possible regio- and stereoisomers. 1-Trimethylsilyl-1-propyne gave only E-isomer with C–C bond formation exclusively at the carbon atom substituted with the silyl group. Other internal acetylenes having a trimethylsilyl group also proceeded regioselectively although mixtures of stereoisomers were obtained.
Synthesis and Properties of New Liquid Crystals Containing Trifluoromethylamino Group
Authors: Kanie Kiyoshi , Mizuno Katsuya , Kuroboshi Manabu , Takehara Sadao , Hiyama Tamejiro
Published: March 2006

Liquid crystalline compounds containing trifluoromethylamino group were conveniently prepared and shown to exhibit mainly smectic phase in a wide range of temperatures. Their properties as a component of nematic liquid crystals are discussed.
An Effective Method to Incorporate Phosphorus Atoms into the Secondary Carbons of Pyranosides
Authors: Shi Ji-Cheng , Hong Mao-Chun , Wu Da-Xu , Liu Qiu-Tian , Kang Bei-Sheng
Published: March 2006

Two new chiral phosphines, methyl 3-deoxy-3-(diphenylphosphino)-4,6-O-benzylidene-α-d-altropyranoside (3) and methyl 2-deoxy-2-(diphenylphosphino)-4,6-O-benzylidene-α-d-altropyranoside (4), have been prepared in high yields from d-glucose via regioselective and stereospecific ring-opening of epoxides. 3 and 4 have been characterized by 1H, 13C, 31P NMR and MS spectra. Crystal structure of 3 has been determined by the single-crystal X-ray diffraction analysis.
Strikingly Selective Ionophoric Properties of Rigid Cyclophanes Having a Small Number of Ligating Sites
Authors: Inokuma Seiichi , Gao Shu-Ren , Nishimura Jun
Published: March 2006

Ionophores 4 and 5 having two acetate groups and two pyridyl groups, respectively, on the aromatic rings as well as oligo(oxyethylene) linked compounds 7a-c were prepared by Williamson ether synthesis between the corresponding halides or ditosylates and dihydroxycyclophane, which was prepared by Birch reduction of the three-bridged dimethoxycyclophane, followed by cleavage of the methoxyl groups. On the liquid-liquid extraction, 4 and 5 showed high affinities toward K+ ion and Ag+ ion, respectively. Compounds 7b and c effectively extracted large alkali metal cations.
Photochromic Reaction of a Diarylethene in Langmuir-Blodgett Films
Authors: Abe Shigeaki , Sugai Akio , Yamazaki Iwao , Irie Masahiro
Published: March 2006

Photochemical properties of a diarylethene with a thiophene and a benzothiophene ring in Langmuir-Blodgett (LB) films have been examined. The diarylethene, which exhibited a highly effective photochromism in fluid solution, was found to show a similar photochromism in LB films. The quantum yields of coloring and breaching reactions have been determined to be 0.27 and 0.10, respectively.
Ultra-highly Active Titanium(IV) Oxide Photocatalyst Prepared by Hydrothermal Crystallization from Titanium(IV) Alkoxide in Organic Solvents
Authors: Kominami Hiroshi , Matsuura Takeshi , Iwai Kunihiro , Ohtani Bunsho , Nishimoto Sei-ichi , Kera Yoshiya
Published: March 2006

Microcrystalline titanium(IV) oxide (TiO2) powders having high surface area and high crystallinity were synthesized by high-temperature hydrolysis of titanium(IV) alkoxide in organic media. They were platinized and then used for photocatalytic dehydrogenation of 2-propanol in aqueous solution. The TiO2 catalysts exhibited much higher production rates of hydrogen and acetone than representative active TiO2 catalysts (P-25).
Stereochemical Feature of Palladium(II)-Catalyzed Claisen Rearrangement
Authors: Sugiura Masaharu , Nakai Takeshi
Published: March 2006

The title rearrangements of the geometrical isomers of crotyl enol ethers are shown to exhibit the identical anti diastereoselection, in contrast to the high stereospecificity observed in the thermal rearrangements. These outcomes are discussed on mechanistic grounds.
High Catalytic Activity of Ion-Exchanged Nickel on Carboxymethylated Wood Char in Methanation of Carbon Monoxide
Authors: Suzuki Tsutomu , Imizu Yuzo , Satoh Yoshinobu , Ozaki Sunao
Published: March 2006

Catalytic behavior of ion-exchanged nickel on carboxymethylated wood char in methanation of carbon monoxide was examined at 300–500 °C. Its activity was higher than those of nickel/activated carbon and nickel/Y-zeolite. The result demonstrated that carboxymethylation of wood is an effective modification for high dispersion of metallic nickel particles on the char.
A New Method for the Preparation of A- and D-Rings of Phycocyanobilin Using Mucochloric Acid as a Starting Material
Authors: Ngwe Hla , Nakayama Eriko , Higashi Taijiroh , Kinoshita Hideki , Inomata Katsuhiko
Published: March 2006

Diethyl 4-ethyl-1,5-dihydro-3-methyl-5-oxo-2H-pyrrol-2-ylphosphonate and 2-ethylidene-3-methyl-1-thiosuccinimide as D-and A-rings of phycocyanobilin dimethyl ester could be synthesized by using commercially available mucochloric acid as a starting material in good yields.
Synthesis and Properties of Dimeric Antiferroelectric Liquid Crystals
Authors: Suzuki Yoshiichi , Isozaki Tadaaki , Kusumoto Tetsuo , Hiyama Tamejiro
Published: March 2006

Dimeric liquid crystals of general structure [(S)-n-CmH2m+1O-C6H4C6H4COOC6H4COOCH(CF3)]2(CH2)n (m = 8, 10; n = 7, 9, 11) prepared from (S)-(trifluoromethyl)oxirane exhibited stable antiferroelectric chiral smectic C phase and were shown to be good dopants for antiferroelectric liquid crystals.
Stereoselective Construction of Oxetane by Titanium(IV) Chloride Promoted [2+2] Cycloaddition of Allylsilane to α-Keto Esters
Authors: Akiyama Takahiko , Kirino Mikio
Published: March 2006

Titanium(IV) chloride mediated [2+2] cycloaddition of allylsilanes, which possess bulky substituents at the silicon, to α-keto esters underwent highly stereoselectively in toluene to afford oxetane derivatives in excellent yields.
A New and Efficient Method for the Selective Reduction of Nitroarenes: Use of Ammonium Sulphate-Sodium Borohydride
Authors: Gohain Sujata , Prajapati Dipak , Sandhu Jagir S
Published: March 2006

Various nitro compounds were selectively and rapidly reduced to their corresponding amino compounds in good yield using ammonium sulphate-sodium borohydride, a novel reduction system.
First Synthesis of Nucleosidyl Phosphorofluoridothioates and a Convenient Synthesis of Nucleosidyl Phosphorofluoridates
Authors: Dabkowski Wojciech , Tworowska Izabela
Published: March 2006

The first synthesis of 3′- or 5′-nucleosidyl phosphorofluoridothioates RO-P(S)(OH)F have been accomplished via nucleosidyl phosphoramidofluoridates RO-P(NPri2)F. An analogous convenient procedure has been employed to prepare 3′- or 5′-nucleosidyl phosphorofluoridates RO-P(O)(OH)F.
Reaction of [Co(η5-Cp)I(S2CNMe2)] with Diazomethane - Formation and Structures of 5-Membered 1,2,4-Cobaltadithiolene by Insertion of Methylene and 4-Membered 1,3-Cobaltathietane Formed by Desulfurization and Insertion of Methylene
Authors: Kajitani Masatsugu , Adachi Sachiyo , Takiuchi Izumi , Nagao Noriharu , Sugiyama Toru , Akiyama Takeo , Sugimori Akira
Published: March 2006

(η5-Cyclopentadienyl)iodo(N,N-dimethyldithiocarbamato)cobalt(III) (1) reacts with diazomethane at 0 °C to give two novel complexes: (η5-cyclopentadienyl)[(dimethylamino)thioxo-κS-methylthiomethanido-κC]iodocobalt(III) having a five-membered 1,2,4-cobaltadithiolene ring and (η5-cyclopentadienyl)(dimethylaminomethylene-κC-thiomethanido-κC)iodocobalt(III) having a four-membered 1,3-cobaltathiethane ring. The former is formed by insertion of methylene into Co-S bond and the latter by insertion of methylene into Co-S bond, accompanied by desulfurization.
Rotationally Fixed 2-Methylbenzimidazole Ligand in Nonplanar Cobalt(III)-Porphyrin Complexes
Authors: Nakamura Mikio , Ikezaki Akira
Published: March 2006

Dynamic 1H and 13C NMR studies have revealed that the 2-methylbenzimidazole ligand in bis(2-methylbenzimidazole)tetraphenylporphyrinatocobalt(III), [Co(tpp)(2-MeBzIm)2]Cl, is fixed relative to the porphyrin ring. Fixation of the ligand was ascribed to the nonplanar nature of the porphyrin ring caused by the severe steric repulsion between the ligand and meso-substituents.
Double-Bridged Tetrathiafulvalenophanes as Novel Electron Donors: Syntheses, Structures, and Properties of Three Structural Isomers
Authors: Takimiya Kazuo , Aso Yoshio , Ogura Fumio , Otsubo Tetsuo
Published: March 2006

Novel three isomeric tetrathiafulvalenophanes, of which the two TTF units are connected with double ethylenedithio spacers, have been synthesized and separated from one another. Their structures were determined by X-ray crystallographic analyses as well as 1H-NMR analyses.
Preparation of Narrow Polydispersity Polycaprolactone Catalyzed by Cationic Zirconocene Complexes
Authors: Mukaiyama Teruaki , Hayakawa Michiya , Oouchi Kunihiro , Mitani Makoto , Yamada Tohru
Published: March 2006

Various cationic zirconocene complexes effectively catalyzed polymerization of ε-caprolactone in a living fashion at ambient temperature to afford polycaprolactone possessing narrow molecular weight distribution (Mw/Mn = 1.06–1.3). The efficiency of the catalyst in the polymerization was enhanced by modifying the structure of cyclopentadienyl ligands.
Charge-Transfer Interaction between Phenothiazine- and Viologen Moieties Adsorbed to Quartz-Solution Interface as Studied by Optical Second Harmonic Generation (SHG)
Authors: Toki Akira , Yonemura Hiroaki , Yamada Sunao , Matsuo Taku
Published: March 2006

As to phenothiazine-viologen pair at quartz-solution interface, SHG was verified to serve as an excellent probe for charge-transfer interaction. The SHL intensity rapidly increased with the decrease of solvent polarity.
Copper(II) Mixed Ligand Complex with an N-Alkylated Diamine and a New β-Diketonate
Authors: Jalilehvand Farideh , Ishii Youichi , Hidai Masanobu , Fukuda Yutaka
Published: March 2006

Reaction of two acetylacetones with p-anisaldehyde resulted in a new β-diketonate ligand which can form a mixed ligand Cu(II) complex with an N-alkylated ethylenediamine. The X-ray structure of the complex was determined and its chromotropic property in solution characterized.
Evidence for the Equilibrium and Estimation of the Equilibrium Constants between Molecular Complexes and Trigonal Bipyramidal Adducts of Diaryl Selenide Dibromides in Solution
Authors: Nakanishi Warô , Hayashi Satoko
Published: March 2006

The equilibrium is clearly shown between molecular complexes (MC’s) and trigonal bipyramidal adducts (TB’s) in 2-O2NC6H4SeBr2C6H4Y-p in solution. The equilibrium constants are also estimated. Both TB’s and MC’s become unstable when the effective electronegativity of the selenium atom and the bulkiness around the atom in a selenide are increased, however, the magnitude is larger for TB’s than for MC’s.
The Central C–C Bond Length in the Bi(anthracene-9,10-dimethylene) Photoisomer: Unusual Elongation and Crystalline State Reaction
Authors: Harada Jun , Ogawa Keiichiro , Tomoda Shuji
Published: March 2006

Crystal structure analysis of bi(anthracene-9,10-dimethylene) photoisomer (1) revealed that the anomalous elongation of the central C–C bond in the previously reported X-ray structure is an artifact caused by partial cycloreversion of 1 to no-bonded isomer in crystalline state.
Formation of a DNA Complex with Lipoglutamide Having Tetraethyleneglycol Tails and Its Interaction with a Tumor Cell
Authors: Sato Toshinori , Akino Hiroyuki , Okahata Yoshio
Published: March 2006

A cationic lipoglutamide having tetraethyleneglycol tails was synthesized. A DNA complex with the cationic lipoglutamide was formed in water, and showed efficient uptake into Hela cells.
One-Pot Synthesis of Perfluorobutyl-Substituted Polysilyne
Authors: Watanabe Akira , Ito Osamu , Miwa Takao
Published: March 2006

One-pot synthesis of perfluorobutyl-substituted polysilynes from perfluorobutyl iodide and tetrachlorosilane was achieved by electrochemical reduction using a magnesium working electrode. Absorption and emission spectra of those polymers showed characteristics of a silicon network polymer.
Tris(2-aminoethyl)amine, a Suitable Spacer for Phosphate and Sulfate Receptors
Authors: Raposo César , Almaraz Marta , Martín Mercedes , Weinrich Volker , Mussóns Mª Luisa , Alcázar Victoria , Caballero Mª Cruz , Morán Joaquín R.
Published: March 2006

Tris(2-aminoethyl)amine and cis-1,3,5-tris(aminomethyl)cyclohexane have been checked as spacers for phosphate receptors. Ureas are better binding arms than thioureas for these spacers while the combination of this first functional group with chromenone fragments permits further increases in the phosphate and sulfate association constants.
Amino Acid Exchange Reaction of Bis(pyridoxylidene-amino acidato)cobalt(III) Complex Promoted by the α-Hydroxylation
Authors: Jitsukawa Koichiro , Yamamoto Tetsuya , Takahashi Hiroshi , Masuda Hideki , Einaga Hisahiko
Published: March 2006

A new type of amino acid exchange reaction that is promoted by the α-hydroxylation was found to proceed on the bis(pyridoxylidene-α-hydroxyamino acidato)cobalt(III) complexes under aerobic conditions.
Reactivity of Cation Radicals Generated from Trivalent-Phosphorus Compounds in the Reaction with Methylviologen: Kinetic Analysis
Authors: Yasui Shinro , Shioji Kosei , Tsujimoto Munekazu , Ohno Atsuyoshi
Published: March 2006

Cation radicals generated from trivalent-phosphorus compounds through single-electron transfer to methylviologen undergo ionic reactions with alcohols or thiols. A kinetic analysis of the reactions has suggested that the reaction of the trivalent-phosphorus cation radicals with alcohols possesses a tighter transition state than that with thiols.
Photoaddition Reaction of 1,4-Diethynylbenzene to Tetramethyl-1,4-benzoquinone and Photochemical Transformation of the Photoadducts
Authors: Kim Sung Sik , Kim Ae Rhan , O Kwang Joong , Yoo Dong Jin , Shim Sang Chul
Published: March 2006

Irradiation of a dichloromethane solution of tetramethyl-1,4-benzoquinone and 1,4-diethynylbenzene with 300 nm UV light yields three kinds of photoadducts which are interconverted photochemically into their corresponding isomers.
High Br− Ionic Conductivity for (1−x)PbBr2· xKBr System
Authors: Aono Hiromichi , Sugimoto Eisuke
Published: March 2006

The electrical conductivity of (1−x)PbBr2 ·xKBr solid electrolytes enhanced with increasing x up to x = 0.02, where 2.7 × 10−6 S · cm−1 at 298 K was obtained. The carrier ion for this system was Br−, as determined by the Tubandt’s method.
Conversion of N-Acyllactams into α-Alkylated Cyclic Enamides via Vinyl Triflates
Authors: Tsushima Kazunori , Hirade Tetsuya , Hasegawa Hirohiko , Murai Akio
Published: March 2006

N-Acylated six- or seven-membered lactams were converted effectively into various α-alkylated cyclic enamides via their corresponding vinyl triflates.
Electropolymerization of o-Mercaptoaniline Monolayer Self-assembled on an Au Electrode
Authors: Sato Naotake , Nonaka Tsutomu
Published: March 2006

An electroactive monolayer of poly(o-mercaptoaniline) was prepared by electrooxidatively polymerizing o-mercaptoaniline self-assembled on an Au electrode.
Achiral Molecules Move and Order Themselves in a Chiral Form in Host-Guest Inclusion Crystals
Authors: Toda Fumio , Miyamoto Hisakazu
Published: March 2006

When optically active host compound was mixed with achiral guest compound in the solid state, host-guest inclusion crystals were formed by molecular movement and the achiral molecules became arranged in a chiral form in the inclusion crystals. Mixing of powdered (+)-host crystals with powdered (−)-guest crystals which are formed by a chiral arrangement of achiral guest molecules gave inclusion crystals of the (+)-host and the (+)-guest molecules newly produced through an inversion of the (−)-guest molecules during the complexation in the solid state.
The First X-Ray Structural Analysis and Photolysis of Germatetrasilacyclopentanes
Authors: Suzuki Hideo , Kenmotu Nozomu , Tanaka Ken , Watanabe Hamao , Goto Midori
Published: March 2006

The five-membered ring system, germatetrasilacyclopentane, [R2Si]4GePh2 (1a: R = iPr; 1b: R = tBuCH2), was synthesized and characterized. Their structures have been determined by X-ray analysis, which showed the Si4Ge rings of 1a and 1b to be an envelope and half-chair form, respectively. The photolyses of the compounds using a mercury lamp ( λ = 254 nm) were carried out.
An Improved Anion-Exchange Separation for the Determination of Platinum in Environmental Samples by Inductively Coupled Plasma Mass Spectrometry
Authors: Akatsuka Kunihiko , Hoshi Suwaru , Katoh Takunori , Willie S N , McLaren J W
Published: March 2006

A new and practical column separation/preconcentration method for the determination of Pt in environmental samples is proposed. The method has been successfully applied to the determination of Pt in a tunnel dust sample with isotope dilution ICP-MS. A key to its success is an anion-exchange separation of Pt from Hf.
Lanthanoid Metal Promoted Reaction of Diaryl Ketones and Thioketones with Isocyanides
Authors: Makioka Yoshikazu , Tsuno Masumi , Takaki Ken , Taniguchi Yuki , Fujiwara Yuzo
Published: March 2006

Ytterbium and samarium metals promote the coupling reaction of diaryl ketones and thioketones with isocyanides, leading to 2,2-diaryl-2-hydroxyethylideneamines and 2-amino-1,1-diarylethylene, respectively, in fairly good yields.
Synthesis of Novel Clustered Glycopolymers Containing Triantennary Glycosides of N-Acetyllactosamine
Authors: Furuike Tetsuya , Nishi Norio , Tokura Seiichi , Nishimura Shin-Ichiro
Published: March 2006

An efficient method for the first synthesis of novel glycopolymers containing triantennary glycosides of N-acetyllactosamine [Galpβ(1→4)GlcpNAc] is described. Radical copolymerization of the triantennary glycosides with acrylamide proceeded smoothly in an aqueous solution and gave water-soluble clustered glycopolymers.
Computational Study of Stability and Pseudorotation of Cyclic Penta-coordinated Phosphorous Compounds
Authors: Wasada Hiroaki , Tsutsui Yuko
Published: March 2006

We studied ligand effects to the pseudorotation of cyclic penta-coordinated phosphorous compounds [PX3C4H8] , X = CH3, NH2, OH, F, Cl and H using ab initio molecular orbital methods. The most stable structures and transition states are characterized. These are fundamental data for the control of reaction occurring in this type of compounds.
Thermal Retrocycloaddition of Overcrowded Germirenes. A New Method for the Generation of Germylenes
Authors: Tokitoh Norihiro , Kishikawa Kuniyuki , Matsumoto Tsuyoshi , Okazaki Renji
Published: March 2006

Thermolysis of overcrowded 2,3-diphenylgermirenes bearing bulky substituents on the germanium atom in benzene affords the corresponding kinetically stabilized germylenes, the efficient formation of which is evidenced by the trapping experiments with 2,3-dimethyl-1,3-butadiene. This provides a new and mild method for the generation of germylenes.
Reaction of α-Hydroxydichloromethyl Derivatives with Cesium Acetate
Authors: Sato Ken-ichi , Suzuki Katsuhiko , Hashimoto Yoshihisa
Published: March 2006

The reactions of methyl 4,6-O-benzylidene-2-O-benzoyl- and -2-O-methyl-α-d-ribo-hexopyranosid-3-ulose with dichloromethyllithium gave the corresponding α-hydroxydichloromethyl derivatives in 75% and 87% yields, respectively. The structures of these products were determined by derivation into known compounds, respectively. A novel reaction of dichloromethyl derivatives with cesium acetate was found to give 3-α-hydroxyaldehyde or 3-α-acetoxyaldehyde derivative as a main product. SN2 inversion via spirochloroepoxide was suggested in this reaction by determining configuration of each product.
High Yield Synthesis of High Purity [18F]-Labelled Aromatic Compounds by Aryl F-for-X Halogen Exchange Reactions
Authors: Hashizume Kazunari , Hashimoto Naoto , Cork David G , Miyake Yoshihiro
Published: March 2006

The relative efficacy of aromatic fluorine-for-halogen (F–X) exchange reactions was found to be F–F > F–Cl > F–Br > F–I in a [18F]fluoride-cryptand-oxalate system using 4′-halo-acetophenones (F, Cl, Br and I), key intermediates for many 18F-radiopharmaceuticals. Efficient 18F-labelling reaction and a new chromatographic separation method has enabled the potential of F-for-X exchange (X = Cl and F) to be realized for the high yield synthesis of high purity [18F]-neuroleptics.
The Effect of Cobalt(II) Complex on the Reactivity of Thioester in Radical Process
Authors: Tada Masaru , Kaneko Katsuyuki
Published: March 2006

The 1,2-rearrangement of an (alkylthio)carbonyl group and the radical substitution on sulfur are stimulated by the coexisting cobalt(II) complex, generated intermolecularly or intramolecularly.
Novel Photochemical Coupling of Hindered Phenols in the Presence of Acridine Mechanistically Probed by CIDEP
Authors: Okada Keiji , Okubo Katsura , Oda Masaji , Murai Hisao
Published: March 2006

Irradiation of hindered phenols in the presence of acridine as a light absorber gives bisphenols and biacridane. CIDEP study establishes the path of hydrogen abstraction by the triplet acridine. The overall mechanism is proposed by the product analysis and the CIDEP studies.
Ab Initio Calculations of Entropy and Heat Capacity of 1,1,1,2-Tetrafluoroethan (HFC-134a)
Authors: Nakao Taketoshi , Kobayashi Yoshinori , Wakabayashi Hisao , Takaichi Kenji
Published: March 2006

Constant-pressure molar specific heat and entropy of 1,1,1,2-tetrafluoroethane at several temperatures were calculated by adopting ab initio molecular orbital theory and utilizing a double split valence type basis set. The calculated values for temperatures between −20.0 and 100.0 °C and a constant pressure of 101.3 kPa showed agreement with experimental results within 0.8 Jmol−1K−1 for entropy and within 3.3 Jmol−1K−1 for constant-pressure molar specific heat in the temperatures. However, some modification to the present approach is necessary for evaluating the pressure dependence of constant-pressure molar specific heat.
Stereodynamics of N-Phenyl-9-triptycylamine as a Gear-rotation System
Authors: Yamamoto Gaku , Higuchi Hiroyuki , Yonebayashi Masami , Nabeta Yuki , Ojima Juro
Published: March 2006

13C Dynamic NMR study of N-phenyl-9-triptycylamine (3) reveals that “gear rotation” and “isolated rotation” in 3 have almost the same free-energy barriers of ca. 10.8 kcal mol−1.
Monomeric 10-Sb-5 Pentacoordinate Organoantimony Monohalides and Their Permutational Behavior
Authors: Kojima Satoshi , Takagi Ryukichi , Nakata Hisashi , Yamamoto Yohsuke , Akiba Kin-ya
Published: March 2006

Pentacoordinate organoantimony monohalides [o-O(CF3)2C6H4]2SbX (X = F, Cl, Br, I) were found to topologically permutate intramolecularly as monomers with energy barriers in the order of F < Cl < Br < I in toluene and Br < Cl < I < F in THF.
Significant Enantioselectivity in Alanine Ester Hydrolysis Catalyzed by Imidazole Attached β-Cyclodextrins
Authors: Hamasaki Keita , Ueno Akihiko
Published: March 2006

Imidazole-appended β-cyclodextrins, 3-deoxy-3-imidazolyl-β-cyclodextrin (3Im-βCyD) and 6-deoxy-6-imidazolyl-β-cyclodextrin (6Im-βCyD) were synthesized as substrate selective enzyme mimics. 6Im-βCyD shows marked enantioselectivity in the hydrolysis of Boc-alanine p-nitrophenyl ester rather than 3Im-βCyD. This selectivity could be interpreted by transition stability theory.
Charge-Transfer Complex Formation by Grinding Crystals of Donor and Acceptor
Authors: Toda Fumio , Miyamoto Hisakazu
Published: March 2006

By grinding tetracyanoquinodimethane and tetrathiafulvalene or tetrathianapthacene powders, the corresponding charge-transfer complexes were formed, which showed similar electrical conductivity to those prepared by a recrystallization method.
Highly Active Electrocatalytic Water Oxidation System Composed of Trinuclear Ruthenium Complex Supported on Platinum Black
Authors: Yagi Masayuki , Ogino Isamu , Miura Atsushi , Kurimura Yoshimi , Kaneko Masao
Published: March 2006

Trinuclear Ruthenium complex, Ru-red ([(NH3)5Ru-O-Ru(NH3)4-O-Ru(NH3)5]6+) is adsorbed well onto the electrodeposited Pt-black, and the adsorbed Ru-red works as a highly active catalyst for electrochemical water oxidation
Transannular Cyclization Reaction of Humulene 2,3-Epoxide. Formation of a Compound Shaping TC Conformer
Authors: Hayano Kiyoharu , Shirahama Haruhisa
Published: March 2006

Treatment of humulene 2,3-epoxide (5) with boron trifluoride etherate at 0 °C gave (6E)-(1R*,2R*,3S*,10R*)-3-acetoxy-2,5,5-trimethylbicyclo[8.1.0]undeca-6,9(15)-diene and (4E)-(1S*,2S*,8S*,9S*)-2,8-diacetoxy-2,6,6,9-tetramethylbicyclo[7.2.0]undec-4-ene which corresponded to the transannular bond formation products shaping the CT and TC conformers of 5, respectively.
The Influence of Vibrational Excitation of NO+(X1Σ+:v″) on the Formation of NO(A2Σ+) by the NO+ + SF6− Neutralization Reaction at Thermal Energy
Authors: Tsuji Masaharu , Ishimi Hiroaki , Nishimura Yukio
Published: March 2006

The NO(A2Σ+-X2Πr) emission resulting from the mutual ion-ion neutralization reaction between NO+(X1Σ+) and SF6− has been measured at various source gas pressures of NO+ in a flowing afterglow in order to examine the influence of vibrational excitation in NO+(X:v″). It was found that vibrational excitation in NO+(X:v″) results in vibrational excitation of the product NO(A:v′=v″) molecule with a low rotational excitation.
Surface Tension of Polysilanes Having Oxyethylenic Side Chains
Authors: Oka Kunio , Fujiue Naofumi , Nakanishi Saburo , Takata Toshikazu , Dohmaru Takaaki , Yuan Chien-Hua , West Robert
Published: March 2006

Polysilanes having oxyethylenic side chains, {CH3-Si-CH2CH2CH2O(CH2CH2O)mR1}n where (m = 0,1,2,3) and R1 = CH3 and C2H5, have been prepared. A polysilane of m = 3 and R = CH3 is soluble in alcohols, acetonitrile, and water. Surface tensions of these polysilanes are larger than those of the polysilanes ever reported. While dispersion component stays almost constant(ca. 30–40 dyn/cm), polar component increases with increasing oxygen atom numbers in the side chain. Copolymers also keep the high values of surface tension.
Novel Molecular Arrangement in Asymmetric Bilayered Crystals of the Inclusion Compounds of 3α, 12α, 24-Trihydroxy-5β-cholane
Authors: Sada Kazuki , Matsuo Akemi , Miyata Mikiji
Published: March 2006

A novel molecular arrangement in asymmetric bilayered crystals is described. 3α, 12α, 24-trihydroxy-5β-cholane with benzene clathrate (2:1) have multibilayer structure with parallel fashions both in the lipophilic sites and in the hydrophilc sites.
Imaging of One-Dimensional Conducting Pt Complexes Using Atomic Force Microscopy
Authors: Kawasaki Tatsuji , Jiang Lei , Iyoda Tomokazu , Araki Toshinari , Tryk Donald A , Hashimoto Kazuhito , Fujishima Akira
Published: March 2006

One-dimensional conducting Pt complexes were investigated by atomic force microscopy (AFM). In large scale images, layered structure was observed, which indicated a layer-spreading crystal growth mechanism. The molecular resolution images show the arrangement of the cyanide ligands on the (010) face with a = 9.3 ± 0.4 Å and c = 5.3 ± 0.4 Å.
Two New 7-Geranyloxycoumarins from the Bark of Aegle Marmelos, an Indonesian Medicinal Plant
Authors: Ohashi Kazuyoshi , Watanabe Hisashi , Ohi Katsuhide , Arimoto Hirokazu , Okumura Yasuaki
Published: March 2006

Two new 7-geranyloxycoumarins, chloromarmin and aeglin, were isolated from the bark of Aegle marmelos, and their structures were assigned to be 7-(7-chloro-6R-hydroxy-3,7-dimethyl-2-octenyloxy)coumarin (1) and 7-[6R-(β-d-glucopyranosyloxy)-4R,7-dihydroxy-3,7-dimethyl-2-octenyloxy]coumarin (2), respectively.
d-f Metal Ion Interaction through Fe-C≡N-Ln Bridge between Dicyanobis(1,10-phenanthroline)iron(II) Complex and LnCl3
Authors: Harada Kazumasa , Yuzurihara Junko , Ishii Youichi , Sato Noriko , Kambayashi Hide , Fukuda Yutaka
Published: March 2006

By adding lanthanoid ion (Ln) to a solution of non-charged iron(II) complex, [Fe(CN)2(phen)2], the blue shift in MLCT band of the Fe(II) complex was observed in ethanol, but was not in DMSO. The extent of the band shift depends on the lanthanoid ion size, which is explained by means of Fe-C≡N-Ln interaction. In DMSO, however, the lanthanoid ion is solvated too strongly to form the Fe-C≡N-Ln bridging. The existence of the bridging mode was confirmed by means of the crystal analysis for a Fe2Yb2 tetranuclear complex.
Raman Spectra of LiCo1−yNiyO2
Authors: Inaba Minoru , Todzuka Yasufumi , Yoshida Hiroyuki , Grincourt Yves , Tasaka Akimasa , Tomida Yoshiro , Ogumi Zempachi
Published: March 2006

Raman spectra of lithium-cobalt-nickel oxide, LiCo1−yNiyO2 (0 ≤ y ≤ 1), which is a promising material for the cathodes of secondary lithium batteries, were studied. By factor group analysis, Raman-active modes of LiCoO2 (y = 0) were assigned as A1g + Eg, and their atomic displacements were speculated. The theoretical results were confirmed by the observed two strong Raman band of LiCoO2 (y = 0). With replacing Co with Ni, the intensities of both bands decreased drastically, and the peak wavenumbers of the lower and upper bands were up- and down-shifted, respectively.
Novel Reversible Metallacyclization in [Ru(bpy)2(η1-napy)(CO)]2+ (bpy = 2,2-bipyridine, napy = 1,8-naphthyridine) by Intramolecular Attack of Non-Bonded Nitrogen of napy to Carbonyl Carbon
Authors: Nakajima Hiroshi , Tanaka Koji
Published: March 2006

One-electron reduction of [Ru(bpy)2(η1-napy)(CO)]2+ (bpy = 2,2-bipyridine, napy = 1,8-naphthyridine) induces a reversible attack of non-bonded nitrogen of napy to carbonyl carbon producing a five-membered metallacyclic moiety.
Electronic Spectrum of Jet-Cooled 9-Hydroxyphenalenone-d. Vibrational Mode Specific Proton Tunneling in the S0 State
Authors: Sekiya Hiroshi , Nakano Naohiko , Nishi Kaori , Hamabe Hidenori , Sawada Tsuyoshi , Tashiro Masashi , Nishimura Yukio
Published: March 2006

The fluorescence excitation and dispersed fluorescence spectra of jet-cooled 9-hydroxyphenalenone-d have been measured to investigate vibrational mode specific proton tunneling in the S0 state. Tunneling splittings of a few vibrationally excited states have been determined.
Emission Spectra of HeArn+ (n = 1–3) Cluster Ions Produced from the Helium Afterglow Reactions of Ar
Authors: Tsuji Masaharu , Tanaka Makoto , Nakamura Masafumi , Nishimura Yukio
Published: March 2006

The HeAr+(B2Σ+-X2Σ+,B2Σ+-A22Π1⁄2) emissions resulting from the two-body He+/Ar and three-body He+/Ar/He reactions were observed in the He afterglow reaction of Ar at low Ar pressures below ∼0.14 Torr. At high Ar pressures, new broad bands appeared in the 143-168 nm region. They were ascribed to the B-X and B-A2 transitions of the HeArn+ (n = 2,3) cluster ions.
Highly Selective Solvation of Monopositive Metal Ions in the Gas Phase as Revealed by the Laser Ablation-Molecular Beam Method Using Ammonia-Water Binary Clusters
Authors: Ito Osamu , Horiki Yasuhiro , Nishio Satoru , Matsuzaki Akiyoshi , Sato Hiroyasu
Published: March 2006

Complex formation of metal ions Mg+, Al+, Mn+ and Co+ with ammonia-water binary clusters has been studied by the laser ablation-molecular beam method. While highly selective solvation favoring ammonia was observed for Mn+ and Co+, relatively nonselective solvation was realized for Mg+ and Al+.
Biotransformation of Safflower Yellow B to Carthamin, A Coloring Matter of Safflower
Authors: Onodera Jun-ichi , Kawamoto Ken-ichi , Matsuba Shigeru , Sato Shingo , Kojima Hironori , Kaneya Yuichi , Obara Heitaro
Published: March 2006

Safflower yellow B, one of the yellow coloring components of safflower (Carthamus tinctorius L.), was transformed to red carthamin and safflomin-A in cultured safflower cells. This result suggests that carthamin and other yellow coloring matters are biogenetically derived from safflower yellow B in the florets of safflower.
Stereoselective Cyclopolymerization of 1,5-Hexadiene Using Novel Bis(ferrocenyl)zirconocene Catalyst
Authors: Mitani Makoto , Oouchi Kunihiro , Hayakawa Michiya , Yamada Tohru , Mukaiyama Teruaki
Published: March 2006

A novel heterotrinuclear zirconium-iron complex 1 was synthesized and crystal structure of 1 was determined by X-ray diffraction method. The complex 1 efficiently catalyzed cyclopolymerization of 1,5-hexadiene in the coexistence of methylaluminoxane to afford trans-poly(methylene-1,3-cyclopentane) with high stereoselectivity (98% trans).
Optochemical HCl Gas Detection Based on Tetraphenylporphine Dispersed in Ethyl Cellulose
Authors: Sadaoka Yoshihiko , Sakai Yoshiro , Tagliatesta Pietro , Boschi Tristano
Published: March 2006

To detect sub-ppm levels of dry HCl gas, spectral changes of tetraphenylporphine dispersed in ethylcellulose were examined in the visible region. The Soret and Q-bands of free base tetraphenylporphine are sensitive to sub-ppm levels of HCl with a good reversibility and insensitive to NH3, Cl2, NO2 and NO at room temperature.
Structural and Electrostatic Control of Chemical Modification of Histidine 64 Imidazole in Myoglobin with Cyanogen Bromide and Azide Ion
Authors: Shiro Yoshitsugu
Published: March 2006

I studied modification of the imidazole group of histidine (His) 64 in human myoglobin (Mb) and its mutant (Lys45→Arg; Mb(K45R)) with cyanogen bromide (BrCN) and azide ion (N3−). In wild-type Mb, the modified protein was not obtained, while the modification was successful for mutant Mb(K45R), possibly due to an electrostatic stabilization of the -CN moiety with the Arg45 guanidyl group. This study implies that combination of chemical and recombinant DNA methods open a new method in the protein modification, where an unnatural group can be introduced into a specific site.
Intracomplex Electron Transfer in a Hydrogen-Bonded Porphyrin–Diimide System
Authors: Osuka Atsuhiro , Shiratori Hideo , Yoneshima Ryusho , Okada Tadashi , Taniguchi Seiji , Mataga Noboru
Published: March 2006

Excitation of a hydrogen-bonded complex of zinc porphyrin bearing a 2,6-diacylaminopyridine binding site and N-monosubstituted 1,8:4,5-naphthalene-tetracarboxamide in benzene results in efficient electron transfer to give a charge separated state detectable by picosecond transient absorption spectroscopy.
A New Lignan, (−)-Parabenzoinol, from Parabenzoin trilobum Nakai
Authors: Takaoka Daisuke , Tani Hiroyuki , Nozaki Hiroshi
Published: March 2006

A new tetrahydrofuranol lignan, named (−)-parabenzoinol was isolated from the fresh leaves of Parabenzoin trilobum Nakai (Lauraceae), and its structure has been elucidated by X-ray crystallographic analysis. The isomeric properties of the compound in dimethylsulfoxide solution have been studied on the basis of 1H and 13C NMR spectroscopy.
Effects of Dynamic Process of Hydrogel on Solute Release
Authors: Yonese Masakatu , Sugie Shuichi , Nagata Tsutomu , Kiyohara Kousin
Published: March 2006

Releases of sodium benzoate from calcium alginate (CaAlg) gel beads were studied during deformation processes resulting from the changes of osmotic pressures. The releases were found to be suppressed concomitant with the deformation in the region of high concentrations of adding substances. The suppression was discussed from an advancing boundary.
Synthesis and Structure Determination of an Oxygen-Functionalized Ruthenacycle: Intramolecular Attack of Coordinated Hydroxide on an Acetylenic Ligand
Authors: Oshima Masato , Kobayashi Minoru , Tanaka Masako , Suzuki Hiroharu
Published: March 2006

The reaction of a tetranuclegar hydroxoruthenium complex [(η5-C5Me5)Ru(μ3-OH)]4 (1) with dimethyl acetylenedicarboxylate (DMAD) proceeded at 60 °C to generate a dinuclear oxygen-functionalized ruthenacycle [(η5-C5Me5)Ru]2[μ-η5-OC4(CO2Me)4] (2) via an intramolecular attack of hydroxo ligand on the coordinated C-C unsaturation. The molecular structure of 2 was determined by X-ray diffraction.
Application of Electropolymerized Poly(thiophen derivative)/NBR Composite Film to an Electroluminescence Emission Layer
Authors: Komaba Shin-ichi , Fujihana Kenichiro , Kaneko Norihiko , Osaka Tetsuya
Published: March 2006

A semiconducting composite film of poly(3-substituted thiophen) and insulating nitrile butadiene rubber (NBR) was applied to an emission layer of polymer electroluminescence device. The uniform composite was deposited by electropolymerization of phenyl-, hexyl- and octylthiophen onto an indium-tin oxide glass pre-coated with NBR thin film. By utilizing indium as rectifying contact, visible light was observed from the composites under forward bias. The emission color depended on the substituents in thiophen units.
A Homologation of Aldehydes and Ketones via the Formation and the Subsequent Pummerer-type Ring Fission of 2-Methylsulfinyl-5,6-dihydro-4H-1,3,4-thiadiazine Derivatives
Authors: Shimada Kazuaki , Otaki Akihiro , Yanakawa Masaki , Mabuchi Shosuke , Yamakado Naoya , Shimoguchi Takeshi , Inoue Kazuya , Kagawa Takashi , Shoji Kazutoshi , Takikawa Yuji
Published: March 2006

A two-carbon homologation of aldehydes and ketones was achieved by using a sequence involving the formation and the subsequent Pummerer-type ring fission of 5,6-dihydro-4H-1,3,4-thiadiazine rings possessing methylsulfinyl functionality at C-2.
A Glass Slab Optical Waveguide Detector with an Optical Position Sensor for Flow Analysis
Authors: Tsunoda Kin-ichi , Ueno Hiroko , Akaiwa Hideo
Published: March 2006

An optical position sensor, which converts the shift of light beam center to voltage signal, was used to detect an analyte with a glass slab optical waveguide (SOWG) detector for flow analysis. The detector responded to mixtures of ethanol and water as well as methylene blue (MB) solutions, i.e., to change in the refractive index of the surface area of the SOWG. The detection limit of this system for MB solutions was half of that with the absorbance measurement using the SOWG.
A Slab Optical Waveguide with a Thin Glass Guiding Layer as an Absorption Detector in Flow Analysis
Authors: Tsunoda Kin-ichi , Itabashi Hiromitsu , Akaiwa Hideo
Published: March 2006

Developed was a slab optical waveguide (SOWG) in which thin sheet glass (20 to 200 μm thick) and a poly-tetrafluoroethylene-co-hexafluoropropylene film or air were used as a guiding layer and a clad, respectively. The sheet glass SOWG was evaluated as an absorption detector of flow analysis and gave higher sensitivity than a single-mode K+ doped glass SOWG and comparative sensitivity with a radio frequency sputtered glass SOWG. Thus, this sheet glass SOWG can also be applied to flow analysis as a sensitive absorption detector.
Hydrogen Production from Wet Cellulose by Low Temperature Gasification Using a Reduced Nickel Catalyst
Authors: Minowa Tomoaki , Ogi Tomoko , Yokoyama Shin-ya
Published: March 2006

Wet cellulose was gasified at 350 °C for 1 h in the presence of a reduced nickel catalyst under various operating pressures (8–18 MPa). Hydrogen was obtained specifically at high operating pressures of 17–18 MPa. Under the operating pressure of 18 MPa, the gas yield increased with catalyst loading and reached 91 wt% at the catalyst loading of 20 wt%. The gas consisted of hydrogen of 50 vol%, carbon dioxide of 40 vol% and methane of 10 vol%, which was equivalent to that the hydrogen of 70% in the cellulose was recovered as hydrogen gas.
Effect of Ring Distortion upon Redox Potentials of Metalloporphyrins: Electrochemical Studies of Metallododecaphenylporphyrins
Authors: Takeda Jun , Sato Mitsuo
Published: March 2006

Redox potentials of nonplanar metallododecaphenylporphyrins (MDPP) are determined by cyclic voltammetry. Oxidation processes of MDPP are selectively shifted to negative potentials in comparison with those of planar metalloporphyrins.
Complexation-induced Catalysis in Zinc Insertion into Cationic Porphyrin
Authors: Mizutani Tadashi , Koyama Hiroshi , Ema Tadashi , Nomura Akiko , Yoshida Takashi , Ogoshi Hisanobu
Published: March 2006

Insertion of zinc to a cationic porphyrin in water was accelerated by the addition of catechols and related compounds 2-5, while decelerated by the addition of pyridine derivatives 6-7. Complexes between zinc and 2-7 with different stoichiometric ratios showed different activity toward the zinc insertion reaction. The reaction becomes slower as the ionic strength is higher in the presence of tiron, indicating that electrostatic force plays an important role in the catalysis.
Photochemical Surface Modification of Poly(hexafluoropropylene-co-tetrafluoroethylene) (FEP) Film with Triethylamine
Authors: Ichinose Nobuyuki , Maruo Masaharu , Kawanishi Shunichi , Izumi Yoshinobu , Yamamoto Tadashi
Published: March 2006

Thin film of poly(hexafluoropropylene-co-tetrafluoroethylene) (FEP) reacted with triethylamine (TEA) upon UV irradiation to give hydrophilic and oleophilic surface through complicated defluorination reactions such as introduction of diethylaminoethyl group and formation of unsaturated bonds. Solvent and additive effects on the photoreaction strongly suggested the involvement of an electron transfer process from TEA to FEP.
Time-delayed, Two-color Excimer Laser Photolysis of 1,8-Bis(halomethyl)naphthalenes
Authors: Ouchi Akihiko , Yabe Akira
Published: March 2006

Time-delayed two-color photolysis of 1,8-bis(bromomethyl)naphthalene and l,8-bis(chloromethyl)naphthalene was conducted by successive irradiation of XeCl (308 nm) and XeF (351 nm) excimer lasers. Increase in the yield of the two-photon product, acenaphthene, strongly depended on the delay time of the two lasers and showed two maxima at the delay times of 0–30 ns and 0.2–0.5 μs.
Characterization of a Supersonic N2O Beam by Using a 2m-Electric Hexapole Field
Authors: Ohoyama Hiroshi , Tsuboi Shinji , Kasai Toshio
Published: March 2006

Characterization of supersonic N2O beam seeded in Ar was carried out by using a 2m-electric hexapole field. The rotational, translational and vibrational distributions were determined by the analysis of the focusing curves at various stagnation temperature. Inversion of the temperature between the rotation (5 K) and the translation (9 K) was revealed. Regardless of the stagnation temperature, the vibrational temperatures were found to be lower than the stagnation temperatures by ∼70 K, indicating the constant energy release in the bending mode of N2O.
Preparation and Properties of Hexamethylphosphoramide-Coordinated Complexes of Samarium(III) Iodide
Authors: Imamoto Tsuneo , Yamanoi Yoshinori , Tsuruta Hideyuki , Yamaguchi Kentaro , Yamazaki Mikio , Inanaga Junji
Published: March 2006

Samarium(III) iodide complexes with hexamethylphosphoramide ligand, [SmI3(hmpa)2(H2O)5]·2hmpa and SmI3(hmpa)3(H2O)4, have been isolated and structurally characterized by X-ray diffraction analyses. The dehydrated complex, SmI3(hmpa)4, was less reactive toward n-butyllithium or samarium metal than SmI3.
Polar Effects in the Transition State of the Bergman Cyclization
Authors: Schmittel Michael , Kiau Susanne
Published: March 2006

From the kinetic data of enediynes 1a-c it is concluded that electron withdrawing substituents are lowering the free activation energy in the Bergman cycloaromatization by decreasing the repulsion of the in-plane π-orbitals.
Iridium(I)-Catalyzed Asymmetric Hydrogenation of Prochiral Imines; Protic Amines as Catalyst Improvers
Authors: Tani Kazuhide , Onouchi Jun-ichiro , Yamagata Tsuneaki , Kataoka Yasutaka
Published: March 2006

A catalytic system, Ir(I)-BINAP-protic amine, was found to be effective for asymmetric hydrogenation of imines and the highest enantioselectivity of 90% ee has been attained for the hydrogenation of the cyclic imine, 2-phenyl-3,4,5,6-tetrahydropyridine.
New Entry to Chiral Base Catalyst. Asymmetric Michael Addition of α-Substituted β-Keto Esters to Methyl Vinyl Ketone Catalyzed by Podand-type Alkali Metal 2′-Substituted 1,1′-Binaphthalen-2-oxides
Authors: Tamai Yasufumi , Kamifuku Atsushi , Koshiishi Eiji , Miyano Sotaro
Published: March 2006

Asymmetric Michael reactions of α-substituted β-keto esters with methyl vinyl ketone catalyzed by 10 mol% of sodium 2′-[2-(2-methoxyethoxy)ethoxy]-1,1′-binaphthalen-2-oxide gave the optically active adducts quantitatively in up to 64% enantiomeric excess.
Decomposition of Geosmin in Aqueous Solution by Sonication
Authors: Yoo Youngeok , Takenaka Norimichi , Bandow Hiroshi , Nagata Yoshio , Maeda Yasuaki
Published: March 2006

Geosmin was decomposed by sonication in aqueous solutions saturated with various gaseous envelopes. The order of the decomposition rate of geosmin under the atmosphere was as follows ; argon > oxygen ≥ air > nitrogen.
An Effect of Anodic Reaction on the Current-Voltage Characteristics of Solid Oxide Fuel Cells
Authors: Eguchi Koichi , Kunisa Yasuhiro , Adachi Kentaro , Kayano Masashi , Sekizawa Koshi , Arai Hiromichi
Published: March 2006

The anodic concentration overvoltage was dominant in the low current density region when high concentration of CH4 or H2 was supplied to a Ni-YSZ anode of a solid oxide fuel cell. For a dilute fuel condition, the concentration overvoltage was small at low current densities, but a limiting current appeared due to depletion of fuel at high current densities. In extremely high PO2 region, the anodic polarization became large due to surface oxidation of Ni metal particles.