bluuebunny/crossref_metadata_2025 huggingface dataset:
57Fe-Moessbauer Spectroscopic Studies of the Ferrocenylruthenocenium+BF4− Salts
Authors: Watanabe Masanobu , Sano Hirotoshi
Published: May 2006

Ferrocenylruthenocene reacts with sulfuric acid-NH4BF4 to give a diamagnetic ferrocenylruthenocenium+BF4− salt, while it reacts with benzoquinone-BF3(Et2O) to give a paramagnetic ferrocenylruthenocenium3+(BF4−)3 salt. Based on the results of 57Fe-Moessbauer spectroscopic studies, the Moessbauer parameters of the former salt are very similar to those of neutral ferrocenylruthenocene, suggesting that the structure of the salt is assumed to be [Cp(C5H4)Fe(C5H4)CpRu–RuCp(C5H4)Fe(C5H4)Cp]2+(BF4−)2 in the solid state.
Effects of Addition of Potassium Promoter to Titania-Supported Ultrafine Particles of Iron Metal Prepared by Gas Evaporation Method
Authors: Chang Byong-tae , Kim Sung-jin
Published: May 2006

Effects of addition of potassium promoter on the catalytic properties of ultrafine particles of Fe metal prepared by the gas evaporation method have been studied for CO hydrogenation. The potassium promoter was found to be very effective in enhancing the catalytic activity and light olefin selectivity of UFP-Fe/TiO2, an optimum amount of K2CO3/Fe being 6 wt%. Four kinds of TiO2 with different physical and chemical properties were used as supports for UFP-Fe, and their effects on the activity and light olefin selectivity also have been discussed.
Cycloaddition of 5-Dialkylamino-1,2,4-dithiazole-3-thione with Dialkylcyanamide under High Pressure
Authors: Tsuchiya Tohru , Yasumoto Masahiko , Shibuya Isao
Published: May 2006

The title reaction at 800 MPa, 70 °C, give 5-imino-1,4,2-dithiazoles, formed through 1,3-dipolar cycloaddition. These adducts decompose to the reactants on heating at ambient pressure. At 160 °C and 800 MPa, the reaction give thermally stable [1,2,4]dithiazolo[1,5-b][1,2,4]dithiazole-6a-SIV derivatives.
Generation of F-Alkyl-substituted Vinyl Thionium Ion Intermediates and Their Reaction with Silyl Enol Ethers. A New Route to δ-F-Alkyl-α,β;γ,δ-unsaturated Carbonyl Compounds
Authors: Ishihara Takashi , Shinozaki Takao , Kuroboshi Manabu
Published: May 2006

Treatment of 3-F-alkyl-3-fluoro-2-propenyl phenyl or ethyl sulfoxide with trimethylsilyl triflate and a hindered amine produces the corresponding vinyl thionium ion species, which readily reacts with silyl enol ethers to give δ-F-alkylated γ,δ-unsaturated carbonyl compounds. These compounds are converted into δ-F-alkyl-α,β;γ,δ-unsaturated carbonyl compounds in good yields.
Syntheses, Crystal Structures, and Antitumor Activities of the Optically Isomeric Mandelate Chelates, Mandelato(trans-1,2-diaminocyclohexane)platinum(II)
Authors: Miyamoto T Ken , Okude Kojiro , Maeda Kazuyuki , Ichida Hikaru , Sasaki Yukiyoshi , Tashiro Tazuko
Published: May 2006

The four optical isomers of mandelato(trans-1,2-diaminocyclohexane)platinum(II) have been prepared. The X-ray crystal structure analyses of a pair of diastereomer have confirmed that the skeletal configuration of (R)- or (S)-mandelic acid has been retained on the chelation of platinum(II). Preliminary animal test against mice leukemia L1210 has been carried out using these compounds.
Photochemical Regioselective Addition of Alkylacylgermanes to Styrene
Authors: Kiyooka Syun-ichi , Hamada Maki , Matsue Hideaki , Fujiyama Ryoji
Published: May 2006

Photochemical addition of alkylacylgermanes to styrene has been achieved to give regiose1ective 1 : 1 and 2 : 1 adducts of acylgermanes to styrene in good yields.
Crystal Structure of catena-[catena-Bis-μ-(1,9-diaminononane)cadmium cis-di-μ-cyano-dicyanonickelate(II)]-(2,3-Xylidine)(1/2)
Authors: Hashimoto Masato , Hasegawa Tai , Ichida Hikaru , Iwamoto Toschitake
Published: May 2006

The two-dimensional host metal complex of the title inclusion compound is built of one-dimensional extension of cadmium atoms bridged doubly by ambidentate 1,9-diaminononane ligands and cross-linking of tetracyanonickelate(II) between the cadmium atoms in adjacent doubly-bridged chains. The cavity formed in the two-dimensional network accommodates a pair of the guest molecules.
Synthesis of 3-Methyl-4-substituted Butenolides Using Regioselective Reaction of Phenylsulfonylbutenolide
Authors: Yoda Hidemi , Shirakawa Koji , Takabe Kunihiko
Published: May 2006

The anion of 4-phenylsulfonylbutenolide generated by deprotonation with lithium diisopropylamide reacted with a variety of electrophilic reagents regioselectively to afford 4-alkylated compounds, which were desulfurized in good yields to 4-substituted butenolides upon treatment with tri-n-butyltin hydride.
Reductive Cross Coupling Reaction of a Glyoxylate with Carbonyl Compounds. A Facile Synthesis of α,β-Dihydroxycarboxylate Based on a Low Valent Titanium Compound
Authors: Mukaiyama Teruaki , Sugimura Hideo , Ohno Takashi , Kobayashi Shu
Published: May 2006

On treatment with a low valent titanium compound, a glyoxylate is reductively converted to the titanium enediolate, which reacts with carbonyl compounds to give the corresponding adducts, α,β-dihydroxycarboxylates, in good yields.
Spinning-Rate-Dependent Shift in Magic-Angle-Sample-Spinning NMR Observed in Cuprous Halides
Authors: Hayashi Shigenobu , Hayamizu Kikuko
Published: May 2006

We have found that the isotropic peak position changes depending on the spinning rate of the sample in 63Cu, 65Cu, 127I, and 79Br magic-angle-sample-spinning (MAS) NMR of cuprous halides, CuI, CuBr, and CuCl. The mechanisms which cause the spinning-rate-dependent shift are briefly discussed.
Dependence of Quenching Cross-section of 326.1 nm Cadmium Resonance Line by Alkane Hydrocarbons on C–H Bond Strength
Authors: Yamamoto Shunzo , Hokamura Hiroyuki
Published: May 2006

The intensity of the 326.1 nm resonance line of cadmium were measured at 485 °C and various pressures of the quenchers (methane, ethane, propane, butane, and isobutane). The quenching rate constants were determined on the basis of the Stern–Volmer plots. A dependence of the quenching cross-section on C–H bond strength was observed.
Electrochemical Polymerization of Benzene Using a Composite Electrolyte of Aluminum Chloride and Copper(I) Chloride
Authors: Hara Susumu , Toshima Naoki
Published: May 2006

Poly(1,4-phenylene) (polyparaphenylene, PPP) film has been prepared by electrochemical polymerization of benzene using a composite electrolyte of aluminum chloride and copper(I) chloride. The growing side surfaces of the films prepared at +1.8 V and +3.0 V versus saturated calomel electrode show the fibrous structure, which is much different from those of other PPP films.
Influence of the Carbon Backing Paper on Oxygen Reduction Parameters in Phosphoric Acid Fuel Cell Electrodes
Authors: Watanabe Masahiro , Stonehart Paul , Inoue Mikio , Fukui Hiroaki , Miwa Kishio
Published: May 2006

Significant diffusion overpotential losses are encountered due to the carbon backing paper alone in phosphoric acid fuel cell electrodes. Above that, the diffusion overpotentials in the electrocatalyst layer are also significant, so gains are still to be made by further reducing both of these diffusion overpotentials. Since the overpotential in the backing paper is proportional to the thickness of the paper, reduction of the thickness is very important for the improvement of the electrode performance.
Counterion Effects on the Photoinduced Electron-Transfer and the Reverse Process in Porphyrin–Viologen Linked Compounds
Authors: Mitsui Akira , Uehata Akihiro , Nakamura Hiroshi , Matsuo Taku
Published: May 2006

In porphyrin–viologen linked compounds, photoinduced electron-transfer from porphyrin to viologen was suppressed by Br−, while the decay of the resulting triplet radical pair was accelerated by the same counterion. Contribution of heavy atom effects and CT interaction was suggested to explain the observed counterion effects.
High-Enantioselective Synthesis of Pyrrolidine Derivatives as Chiral Building Blocks
Authors: Hirai Yoshiro , Chintani Masaru , Yamazaki Takao , Momose Takefumi
Published: May 2006

All four stereoisomers of a pyrrolidine derivative, which is useful as a versatile chiral building block for synthesis of several pyrrolizidine alkaloids, were prepared in high enantioselectivity by utilizing the Sharpless epoxidation of the intermediate allyl alcohol starting from propargyl alcohol.
Facile Synthesis of α-Keto Acids and Esters by Palladium-Catalyzed Decarboxylation Reactions of Diallyl α-Oxalcarboxylates
Authors: Shimizu Isao , Makuta Toshiyuki , Oshima Masato
Published: May 2006

Reaction of diallyl α-oxalcarboxylates with formic acid in the presence of palladium catalyst gave α-keto acid in good yields. When the reaction was carried out without formic acid, decarboxylation-allylation took place to give allyl β-allyl-α-keto carboxylates.
Baker’s Yeast Mediated Bioreduction. A New Procedure Using Ethanol as an Energy Source
Authors: Kometani Tadashi , Kitatsuji Eitaro , Matsuno Ryuichi
Published: May 2006

A practical procedure using ethanol as an energy source was developed on the baker’s yeast mediated bioreduction of prochiral ketones.
Synthesis of 5-Deoxy-5-[(R and S)-methylphosphinyl]-α,β-D-manno-pyranoses. The First P-in-Ring Sugar Analogues of D-mannose Type
Authors: Yamamoto Hiroshi , Hanaya Tadashi , Ohmori Katsuhiko , Kawamoto Heizan
Published: May 2006

Starting with methyl 2,3-O-isopropylidene-α-D-lyxo-pentodialdo-1,4-furanoside, methyl 5-deoxy-2,3-O-isopropylidene-5-[(methoxy)methylphosphinyl]-α-D-lyxo-hexofuranoside (8) was prepared (in 5 steps, 16% overall yield). The hexose 8 was converted into the title compounds, which were characterized as the 1,2,3,4,6-pentaacetates.
57Fe-Mössbauer Spectroscopic Studies of Mixed-valence Binuclear Ferrocenes with Various Metal Complex Anions
Authors: Kai Masahiro , Katada Motomi , Sano Hirotoshi
Published: May 2006

Mixed-valence binuclear ferrocenium salts with FeCl4−, SnCl62−, and ZnCl42− anions were studied by using 57Fe-Mössbauer spectroscopy. The FeCl4− and SnCl62− salts show two types of the temperature dependence of the spectra, whereas the ZnCl42− salt shows no temperature dependence, concluding that the valence state of iron atoms does not depend on the chemical nature of binuclear ferrocenyl cations but on the interactions through the cations and the anions in solid.
Catalysis by Synthetic Hydrotalcite-like Minerals in a Disproportionation of Trimethoxysilane
Authors: Suzuki Eiichi , Okamoto Masaki , Ono Yoshio
Published: May 2006

The hydrotalcite-like mineral containing interlayer Cl− or CH3O− anions catalyzed a reaction, 4 (CH3O)3SiH → 3 (CH3O)4Si + SiH4. Thus, for example, when 41 mmol of (CH3O)3SiH was subjected to the reaction at 323 K for 6 h in the presence of 0.62 g of the mineral containing interlayer CH3O− anions (2.0 mmol of CH3O− anions), the conversion of (CH3O)3SiH was 83%.
Chemical Behavior of Coenzyme PQQ toward Diamines
Authors: Mure Minae , Itoh Shinobu , Ohshiro Yoshiki
Published: May 2006

Reaction of the coenzyme PQQ with several α,ω-diaminoalkanes was examined in the CTAB micellar system. α,ω-Diaminoalkanes having 4 to 10 methylene carbons were oxidized to the corresponding aminoaldehydes by PQQ efficiently. On the other hand, ethylenediamine showed competitive inactivation by forming the cyclic adduct, a pyrazine derivative. The reaction mechanism is also discussed.
Generation of Sulfenate Salts via Ipso-substitution of Azaheterocyclic Sulfoxides. First Preparation and Characterization of Sodium 2-Pyridinesulfenate
Authors: Furukawa Naomichi , Konno Yasuo , Tsuruoka Masayuki , Fujihara Hisashi , Ogawa Satoshi
Published: May 2006

2-Alkyl- or 2-aryl-sulfinylpyridine N-oxides undergo ipso-substitution reaction with sodium ethoxide to afford sodium sulfenates which were converted soon to the corresponding sulfinates upon contact with oxygen. Sodium 2-pyridinesulfenate was prepared and characterized by FT-IR as the first example of stable sulfenate.
Stereorecognition Enhancement by the Sulfur Functional Group in the Lipase Hydrolysis. An Efficient Synthesis of the Optically Active β-Hydroxy Nitriles
Authors: Itoh Toshiyuki , Takagi Yumiko
Published: May 2006

β-phenylthio and β-methylthioacetoxy nitriles have been found to be good substrates for the kinetic resolution by lipase to give optically active β-hydroxy nitriles with high enantioselectivity.
Construction of High-Quality Monolayer by Crystallization on the Water Surface
Authors: Kajiyama Tisato , Umemura Kazuo , Uchida Motoko , Oishi Yushi , Takei Ryutaro
Published: May 2006

Defect-diminished fatty acid monolayer was constructed by cooling the amorphous monolayer on the water surface down to a temperature region below the melting temperature of the monolayer.
Bioreduction of Ethyl 3-Oxobutanoate with Immobilized Baker’s Yeast in Organic-Water Solvent Systems
Authors: Naoshima Yoshinobu , Nishiyama Tadashi , Munakata Yoshihito
Published: May 2006

Immobilized baker’s yeast entrapped in calcium alginate beads has been active in some organic-water solvent systems and reduced ethyl 3-oxobutanoate to ethyl (S)-3-hydroxybutanoate of high enantiomeric purity (95–97% ee’s) in good chemical yields.
A New Series of Liquid Crystalline Side-chain Polymers Containing Boron Atoms
Authors: Matsubara Hiroshi , Seto Koji , Tabuchi Hitoshi , Imazaki Hideyuki , Takahashi Shigetoshi
Published: May 2006

Polyacrylate and polymethacrylate having 1,3,2-dioxaborinane derivatives were synthesized and found to form mesomorphic phases. They provide a new series of liquid crystalline side-chain polymers containing a boron atom in the mesogenic group.
Preparation of MIM(Metal-Insulator-Meta1) Non-linear Device Using Electropolymerized Poly-N-methylpyrrole
Authors: Osaka Tetsuya , Ueyama Ken’ichi , Ouchi Kiyoshi
Published: May 2006

The MIM cell of ITO(indium tin oxide)/polymer/ITO type was prepared by sandwiching electrochemically polymerized poly-N-methylpyrrole(PMPy) film for the insulator between sputtered ITO layers of the cell. When using undoped polymer layer, the two-terminal device shows non-linear and symmetric current-voltage(I–V) curve, where the current changes 5 orders between the voltage of 0 V and ±15 V, respectively.
Synthesis of Tricarbonyl (η6-[6]paracyclophane)chromium. Smallest-Bridged Paracyclophane-Metal Complex
Authors: Tobe Yoshito , Nakayama Atsuyoshi , Kobiro Kazuya , Kakiuchi Kiyomi , Odaira Yoshinobu
Published: May 2006

Tricarbonyl (η6-[6]paracyclophane)chromium has been synthesized and its spectral properties have been investigated.
Photo-induced Stable Radicals in Organic Photoconductors
Authors: Sano Kenji , Hirao Akiko , Uehara Tsutomu
Published: May 2006

Irradiation of fluorescent light onto a solid solution containing a hydrazone compound and a polymer generated stable polymer radicals at room temperature. Spin concentration was 1013 spins/g and saturated within 6 h under 10 Klx fluorescent light. The factors affecting the stable radical formation are discussed.
Characterization of the Chiral Titanium Reagent Prepared from the Tartrate-derived Chiral Diol and Titanium Dichloride Diisopropoxide
Authors: Iwasawa Nobuharu , Hayashi Yujiro , Sakurai Hidehiro , Narasaka Koichi
Published: May 2006

The chiral titanium reagent prepared from the tartrate-derived chiral 1,4-diol and titanium dichloride diisopropoxide was characterized based on the NMR and experimental analyses.
The Reaction Mechanism of Ruthenium-catalyzed Dimerization of t-Butylacetylene to cis-1,4-Di-t-butylbutatriene. Involvement of a Ruthenium-diacetylide Intermediate
Authors: Wakatsuki Yasuo , Satoh Masaaki , Yamazaki Hiroshi
Published: May 2006

The acetylide complex [RuH(C≡C–But)(CO)(PPh3)3] (1) prepared from [Ru(H)Cl(CO)(PPh3)3)] (2) and Li–C≡C-But has been found to be a good precursor for the catalytic dimerization of t-butylacetylene to cis-1,4-di-t-butyl-1,2,3-butatriene. Room temperature reaction of 1 with HC≡CBut has afforded a new complex [Ru(C≡CBu)2(CO)(PPh3)3] which has been structurally characterized as possessing cis-diacetylide ligands. Reaction of 2 with 1,4-di-t-butylbutadiyne gave a complex with 1,4-di-t-butylbut-1-en-3-yn-2-yl ligand, [Ru–{C(=CHBut)–C≡CBut}Cl(CO)(PPh3)2], which decomposed at 60 °C to liberate cis-1,4-di-t-butylbutatriene. The reaction mechanism is discussed based on these findings.
Transition Metal-catalyzed Coupling of [1-(Arylimino)alkyl]zinc with Aromatic Iodide
Authors: Murakami Masahiro , Ito Hirohide , Bakar Wan Azelee bin Wan Abu , Baba Abu Bakar bin , Ito Yoshihiko
Published: May 2006

[1-(Arylimino)alkyl]zinc, prepared by α-addition of organozinc to aryl isocyanide, was coupled with aromatic iodide in the presence of palladium or nickel catalyst to give the corresponding N-aryl aromatic imine.
Observation of CLi3 and CLi4 in the Vapor over Li2C2(s)
Authors: Kudo Hiroshi
Published: May 2006

With Knudsen-effusion mass spectrometry, gaseous CLi3 and CLi4 species were observed for the first time in the vapor equilibrated with Li2C2(s) above 900 K. The ionization potentials and atomization energies of these species as well as the heat of formation of Li2C2(s) were determined.
Laser Flash Photolysis of 3-(4-Biphenylyl)-2H-azirine. Direct Detection of Nitrile Ylide
Authors: Naito Ikuo , Ishida Akito , Yamamoto Kazuki , Takamuku Setsuo , Isomura Kazuaki , Taniguchi Hiroshi
Published: May 2006

Laser flash photolysis of 3-(4-biphenylyl)-2H-azirine (AZ) has been investigated in cyclohexane. Two kinds of transient species; that is, a triplet state (T1) of AZ and a nitrile ylide (NY) were detected. Both transient species have λmax at 410 nm and the decay max rates were 6.7 × 105 s−1 (T1) and 8 × 10 s−1 (NY), respectively. Reaction rate constants of NY with propanone and acrylonitrile were also determined.
Stabilization of Unstable Components in Langmuir–Blodgett Film System by Introduction of Water-Soluble Antioxidants
Authors: Iriyama Keiji , Yoshiura Masahiko
Published: May 2006

Easily oxidizable components simply arranged and/or highly oriented in a monolayer on an aqueous subphase as well as in a Langmuir–Blodgett film were found to be chemically stabilized by the addition of biological water-soluble antioxidants such as glutathione, uric acid, and ascorbic acid.
Photochemistry of Arenedicarboxylic Anhydrides. Insertion of Alkenes into C(=O)–O Bond and Oxetane Formation of 1,2- and 2,3-Naphthalenedicarboxylic Anhydrides
Authors: Kubo Yasuo , Hara Noriko , Nanba Mikako , Tanaka Yoshiaki , Araki Takeo
Published: May 2006

Irradiation of 1,2- and 2,3-naphthalenedicarboxylic anhydrides (5a,b) with alkenes in benzene gave naphthoxepindiones, by insertion of the alkenes into C(=O)–O bond, and oxetanes. The insertion predominated in the reactions of 5a with the alkenes, while the oxetanes were mainly produced in those of 5b.
Enhanced Energy Transfer between Chlorophyll b and Chlorophyll a in the Premicellar Region of Aqueous Surfactant Solution
Authors: Kusumoto Yoshihumi , Soeta Kimihiro , Fukuyama Fumiko , Kurawaki Junichi , Satake Iwao
Published: May 2006

Energy transfer between chlorophyll b and chlorophyll a was enhanced irrespective of the kind of surfactants in the premicellar region below the critical micelle concentration. This effect can be explained in terms of the formation of premicellar aggregates induced by the non-ionic hydrophobic pigments.
Thermal Activation of Alkane C–H Bonds by Palladium Catalysts. Carbonylation of Alkanes with Carbon Monoxide
Authors: Fujiwara Yuzo , Takaki Ken , Watanabe Jun , Uchida Yutaka , Taniguchi Hiroshi
Published: May 2006

The reaction of cyclohexane with 30 atm CO at 80 °C by using the Pd(OAc)2/CF3COOH catalyst system without irradiation gives rise to cyclohexanecarboxylic acid in 195% yield based on Pd with a small amount of benzoic acid. The reactions of cycloheptane and n-hexane give similar results. This constitutes the first example of carboxylation of alkanes with CO by transition metal complexes without irradiation.
Structural Requirement for the J-Aggregate Formation in Dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-diones and Related Compounds
Authors: Takeshita Hitoshi , Mori Akira , Nagao Tomohiro , Nagamura Toshihiko
Published: May 2006

Two tetrapropyl derivatives of dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-dione and 9,11-dipropylcyclohepta[5,6]pyrazino[2,3-b]phenazin-10-one, revealed the J-band in cone H2SO4. On the other hand, 2,3-diphenylcyclohepta[b]pyrazino[2,3-g]quinoxalin-9-one formed a non-J-aggregate, but benzo[g]cyclohepta[b]quinoxalin-9-one formed no aggregate. A pyrazinoquinoxaline framework is required for the aggregation.
The Michael-type Reaction of B-Iodo-9-BBN/Ethoxyethyne Adduct to α,β-Unsaturated Ketones. A Selective Synthesis of δ-Keto Esters
Authors: Kawamura Fumitoshi , Tayano Takao , Satoh Yoshitaka , Hara Shoji , Suzuki Akira
Published: May 2006

The adduct formed from B-iodo-9-borabicyclo[3.3.1]nonane and ethoxyethyne reacts with α,β-unsaturated ketones under mild conditions to give δ-keto esters in excellent yields selectively.
Palladium-catalyzed Asymmetric Allylations of (S)-Proline Allyl Ester Amides
Authors: Hiroi Kunio , Maezuru Kaoru , Kimura Masaru , Ito Naoko
Published: May 2006

Palladium-catalyzed allylations of (S)-proline allyl ester amides are discussed, compared with the intermolecular reactions of (S)-proline methyl and ethyl ester amides with allyl acetate. (S)-Proline allyl ester amide undergoes an intramolecular allylation to demonstrate higher diastereoselectivity than the other systems, upon treatment with palladium catalysts.
Surface Pressure Dependence of A-T Isobars and Two-Dimensional Thermal Expansion coefficient of Insoluble Monolayers of Tristearin at the Air/Water Interface
Authors: Kato Teiji , Ohshima Katsunori , Arai Masatoshi
Published: May 2006

Pressure dependence of A-T isobars of insoluble monolayers of tristearin(TS) was measured with the instrument developed in our laboratory. The isobars look like a group of straight lines in the temperature span measured (5–45 °C). Pressure dependence of the two-dimensional thermal expansion coefficient of the monolayers was calculated by the numerical differentiation of the A-T isobar data with respect to temperature using a simple regression analysis.
[Bisμ-N,N′-bis(o-thiobenzoyl)ethylenediamine-S,O,O′,S′-dinickel(II)]. Synthesis of a 2×{S2O2} Bis-complex and the Structural Analysis
Authors: Yamamura Takeshi , Kuroda Reiko , Tadokoro Makoto
Published: May 2006

N,N′-Bis(o-thiobenzoyl)ethylenediamine reacted with Ni2+ in acetone to form a bis-complex, in which two square planar NiS2O2 units are connected with each other by two ethylene bridges.
Vibrating Phenomenon for Electrode Reaction of Mild Steel in Aqueous Ethanol Solution Containing Sulfuric Acid
Authors: Sekine Isao , Yuasa Makoto , Kohara Kazuki , Ibata Satoshi
Published: May 2006

It was found that natural electrode potential (NEP) of mild steel electrode vibrates in aqueous ethanol solution containing sulfuric acid. By in situ analysis of electrochemical impedance spectroscopy, this vibrating phenomenon is based on the transition between passivation (passive region) and active dissolution (active region) of the mild steel electrode.
Effect of the Introduction of Fluorine into Poly(vinylacetal) Membranes on Transport Properties for Oxygen and Nitrogen Gases
Authors: Kagawa Shuichi , Ishihama Rika , Moriguchi Isamu , Teraoka Yasutake
Published: May 2006

The introduction of fluorine into poly(vinylacetal) membranes was found to increase the permeability for O2 and N2 with a slight decrease in permselectivity. The results obtained indicate that the fluorine-containing poly(vinylacetal) membranes are promising as an oxygen-enriching membrane having relatively high permeability and permselectivity.
2-Substituted gem-Diamines Derived from Amino Acid Amides. Their Applications to Cross-linking in Peptide Dimerization and Conjugation of Dimer to Affinity Matrix
Authors: Shimohigashi Yasuyuki , Kodama Hiroaki , Waki Michinori , Costa Tommaso
Published: May 2006

Treatment of five tripeptide amides Boc-Phe-Leu-NHCH(R)CO-NH2 (R: side chain of Gly, Leu, Phe, Asp(OBzl), or Arg(Tos)) with [bis(trifluoroacetoxy)iodo]benzene and subsequent coupling with Boc-Phe-Leu-OH afforded the dimeric peptides cross-linked with 2-substituted gem-diamines; (Boc-Phe-Leu-)2·(-NHCH(R)NH-). gem-Asp(OBzl)-cross-linked dimer was further converted into enkephalin dimer, which was conjugated to Sepharose 4B gel for receptor affinity purification.
Bis(acyl) Diselenides as Convenient Acylating Reagents
Authors: Nishiyama Yutaka , Katsuura Akio , Okamoto Youji , Hamanaka Sawako
Published: May 2006

Bis(acyl) diselenides serve as useful acylating reagents for amines, alcohols, thiols, and organocopper compounds such as cuprate.
Gel Electrophoretic Demonstration of Pseudo-Grafting of Polyacrylamide onto λ Phage DNA
Authors: Maeda Mizuo , Hirai Akira , Takagi Makoto
Published: May 2006

5-(4-Acryloylaminophenyl)-3-amino-7-dimethylamino-2-methylphenazinium chloride (1) which is a DNA-binding (intercalative) molecule was radically copolymerized with acrylamide in the presence of λ phage DNA. A gel electrophoretic examination of the reaction product has strongly suggested that the DNA was grafted with polyacrylamide chains through 1 (“pseudo-grafting”).
Lewis Acid-Induced Stereoselective Ene-Cyclization of ω-Unsaturated Trifluoromethylketones
Authors: Aubert Corinne , Bégué Jean-Pierre , Bonnet-Delpon Daniéle
Published: May 2006

Lewis Acid-initiated ene-cyclization of ω-unsaturated trifluoromethylketones allows access to 1-trifluoromethyl cyclohexanols and their fused bicyclic derivatives
A Facile Synthesis of (+)-Ramulosin
Authors: Asaoka Morio , Sonoda Syuzo , Takei Hisashi
Published: May 2006

The title compound was synthesized from (R)-(−)-5-trimethylsilyl-2-cyclohexenone.
Quaternary Ammonium Salts as Useful Cationic Initiators. Specially Enhanced Activity by Cyano Group Situated at o-Position of Pyridine Ring of N-Benzylpyridinium Salts
Authors: Lee Sang-Bong , Takata Toshikazu , Endo Takeshi
Published: May 2006

1-Phenethyl and p-methoxybenzyl o-cyanopyridinium hexafluoroantimonates were synthesized, which showed much higher initiation activity than the corresponding p-cyano derivatives in the cationic polymerization of glycidyl phenyl ether.
Palladium-Catalyzed, Atmospheric Pressure Ethoxycarbonylation of Allylic Halides under the Influence of Sodium Ethoxide. A Facile Synthesis of β,γ-Unsaturated Esters
Authors: Kiji Jitsuo , Okano Tamon , Konishi Hisatoshi , Nishiumi Wataru
Published: May 2006

Atmospheric pressure ethoxycarbonylation of allylic halides is realized under the influence of sodium ethoxide. This reaction is catalyzed by Na2PdCl4-bis(diphenylphosphino)ethane (dppe) and offers a convenient synthetic method to β,γ-unsaturated esters.
Binding of Amino Acids with a Bifunctional Metalloporphyrin via Concurrent Metal-Coordination and Electrostatic Interactions
Authors: Aoyama Yasuhiro , Nonaka Shin-ichi , Motomura Tadahiro , Ogoshi Hisanobu
Published: May 2006

The Cl–Rh(III) complex of 5,15-bis [2-(N,N-dimethylaminomethyl-1-phenyl]octaethylporphyrin undergoes intermolecular coordination to give the dimer in CDCl3, which, upon treatment with an aqueous amino acid solution, readily forms a monomeric amino acid adduct via a two-point interaction involving the metal coordination and electrostatic interaction or salt formation.
Synthesis of Novel Biodegradable Poly(amide-Ester)s from Penicillin
Authors: Saotome Yasushi , Miyazawa Takeo , Endo Takeshi
Published: May 2006

Novel biodegradable poly(amide-ester)s were successfully synthesized from antibiotic penicillin, utilizing a nucleophilic addition of primary amines to the β-lactam ring of penicillin.
A DNA Probe of Ruthenium Bipyridine Complex Using Photocatalytic Activity
Authors: Kojima Hiroyuki , Sato Naoko , Kawamoto Yuri , Iyoda Jun
Published: May 2006

A method is presented for labelling DNA and for detection of the complimentary sequence using photocatalytic activity of tris(2,2′-bipyridine)ruthenium(II). A hybridization experiment with a model system has shown that plasmid DNA of ca. 0. 6 μg can well be detected by a dye-forming reaction in photocatalytical redox cycles.
Temperature-Dependent Photostationary trans/cis Ratio in Photosensitized Isomerization of Cyclooctene
Authors: Inoue Yoshihisa , Yamada Tatsuya , Daino Yoshihiko , Kobata Tomokazu , Yamasaki Noritsugu , Tai Akira , Hakushi Tadao
Published: May 2006

In the triplet-sensitized photoisomerization, the photostationary trans/cis ratio of cyclooctene doubled upon lowering irradiation temperature from 25 to −78 °C, whereas the ratio of 2-octene stayed unchanged.
Isomerization Behaviors of Hexamolybdoplatinate and Heptamolybdate Polyanions in the Aqueous Solution
Authors: Park Ki Min , Lee Uk
Published: May 2006

The planar structure (α-isomer) ↔ bent structure (β-isomer) isomerization of [PtMo6O24]−8 and [Mo7O24]−6 polyanions in solutions of various pH as investigated by reversed-phase high-performance liquid chromatography.
Polarizing Film Prepared by Using Linear Poly(2,5-pyridinediyl)
Authors: Yamamoto Takakazu , Maruyama Tsukasa , Kubota Kenji
Published: May 2006

Stretching of poly(vinyl alcohol) film containing poly(2,5-pyridinediyl) in its surface region gives a film which shows an excellent polarizing effect at about 400 nm. Poly(2,5-pyridinediyl) with higher molecular weight gives higher polarizing effect.
A New Facile Method for Construction of β-Arylpyrrolidine Rings and Its Application to Synthesis of (±)-Mesembrine
Authors: Shono Tatsuya , Terauchi Jun , Matsumura Yoshihiro
Published: May 2006

Lewis acid treatment of dimethyl N-methoxycarbonyl-N-methoxymethylaminomalonate together with aryl olefins afforded α,α,N-tris(methoxycarbonyl)-β-arylpyrrolidines, and one of the products was successfully converted to (±)-mesembrine.
High Activity and Selectivity of Sulfided CoNaA Zeolite for Isomerization of 1-Butene
Authors: Sugioka Masatoshi , Nakayama Shin-ichi , Uchida Daisuke , Kanazuka Takaji
Published: May 2006

The effect of sulfiding with H2S on the catalytic activity and selectivity of CoNaA zeolite in the isomerization of 1-butene was investigated. High activity and selectivity to trans-2-butene were obtained by sulfiding of CoNaA zeolite with H2S.
Palladium Catalyzed Alkenylation of 1-Siloxycyclopent-2-ene Leading to Enol Silyl Ether of 3-Alkenylcyclopentanones
Authors: Torii Sigeru , Okumoto Hiroshi , Kotani Takayuki , Akahoshi Fumihiko
Published: May 2006

Palladium catalyzed coupling reaction of alkenyl halides and silylated cyclopentenol in the presence of potassium carbonate produced the corresponding enol silyl ether of 3-alkenylcyclopentanones regioselectively.
Hydrogenolysis of α,β-Epoxyketone and Ester to Aldol in Pd(0)/HCOOH/Et3N and H2/Pd/C Reduction Media
Authors: Torii Sigeru , Okumoto Hiroshi , Nakayasu Seizo , Kotani Takayuki
Published: May 2006

Hydrogenation of α,β-epoxycarbonyl compounds by using several catalysts and hydride sources was studied to obtain the corresponding β-hydroxy substrates.
C–C Bond Formation at α to a Trifluoromethyl Group. Cyanation and Allylation of α-Trifluoromethylated N,O-Acetals
Authors: Fuchigami Toshio , Ichikawa Shinji , Konno Akinori
Published: May 2006

α-Trifluoromethylated N,O-acetals, N-(1-methoxy-2,2,2-trifluoroethyl)anilines readily reacted with cyanosilane and allylsilane in the presence of a Lewis acid to efficiently provide the corresponding trifluoromethylated α-aminonitrile and homoallylamine derivatives, respectively. α-Difluoromethyl-α-aminonitriles were also similarly prepared in high yields using α-difluoromethylated N,O-acetals.
Novel Diastereotopic Isomerism of a Styrene Complex of Pt(II) Containing the η3-Methallyl Ligand
Authors: Kurosawa Hideo , Ikeda Isao
Published: May 2006

The 1H NMR NOE experiments on Pt(η3-CH2CMeCH2)(styrene)(C6F5) indicated that the configuration of the major isomer in CDCl3 solution is similar to that in the solid state determined previously by X-ray analysis. The minor isomer corresponds to a diastereomer of the major isomer, where both isomers contain the C=C bond lying almost in the coordination plane. The interconversion between the two isomers was suggested to be an intramolecular process.
Recognition of Tetralin Hydroperoxide by Cyclodextrins
Authors: Asakura Kouichi , Tanaka Nobutoshi , Matsumura Shuichi , Yoshikawa Sadao
Published: May 2006

The recognition ability of α-, β- and γ-cyclodextrins (CDs) to tetralin hydroperoxide is discussed. CDs formed inclusion complexes more predominantly with tetralin hydroperoxide than with tetralin. The most noticeable specificity was found when β-CD was used as a host. Inclusion complexes of CDs with tetralin were also prepared and their molar ratios were determined.
Palladium(II)-catalyzed Alkoxylation and Acetoxylation of Alkenes
Authors: Hosokawa Takahiro , Shinohara Toru , Ooka Yoshiharu , Murahashi Shun-Ichi
Published: May 2006

Addition of alcohols or acetic acid to alkenes activated by carbonyl or acetal is catalyzed by PdCl2(MeCN)2 to give the corresponding ethers and esters.
Marked Differences in Molecular Association Behavior between Two Regioisomers of γ-Cyclodextrin Derivatives Bearing a Pyrenecarbonyl Moiety at C-2 and C-3
Authors: Suzuki Iwao , Ueno Akihiko , Osa Tetsuo
Published: May 2006

γ-Cyclodextrin derivatives bearing a pyrenecarbonyl moiety at C-2 and at C-3 (1 and 2, respectively) showed marked differences in the fluorescence spectra; 1 exhibits remarkable excimer emission whereas 2 exhibits almost pure monomer emission, suggesting that 1 forms a stable association dimer while 2 exists as a monomer species. Upon addition of 1-borneol, the association dimer of 1 was converted into a 1:1 host-guest complex with the binding constant, 5.1-fold larger than that of 2.
Diazotization of 2-Methyl-2-(1,2,3,4-tetrachloro-9-triptycyl)propylamine Rotamers. A Consequence of Participation of 1-Chloro Substituent during the Formation of Alkyl Cation in the sc-Isomer
Authors: Tanaka Yasuhiro , Yamamoto Gaku , Oki Michinori
Published: May 2006

Diazotization of the ap form of the title compound in benzene with isopentyl nitrite in the presence of acetic acid afforded a mixture of olefins, which were expected from deprotonation reactions of the cation formed by the Wagner–Meerwein rearrangement, while the sc isomer afforded 2-methyl-2-(1,2,3,4-tetrachloro-9-triptycyl)propyl acetate. Participation of the 1-chloro group in stabilization of the cation formed by diazotization was invoked.
A Preparative Route to 2-Substituted 1,1-Diphenylthio Cyclobutanes
Authors: Kwon Tae Woo , Smith Michael B
Published: May 2006

Treatment of 1-phenylthiocyclopropylcarbinyl alcohols with thiophenol and HBr/ZnBr2 gives 2-alkyl (and 2-aryl) 1,1-diphenylthiocyclobutanes.
N-Formylation of Aliphatic Primary Amines with N,N-Dimethylformamide Promoted by 2,3-Dihydro-1,4-phthalazinedione
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi
Published: May 2006

The N-formylation of aliphatic primary amine proceeded very effectively in N,N-dimethylformamide in the presence of restorable 2,3-dihydro-1,4-phthalazinedione.
Diastereofacial Controlled Addition Reaction of Alkoxymethylketones Modified by (2R,4R)-2,4-Pentanediol with Organometallics
Authors: Fujisawa Tamotsu , Watai Toshiyuki , Sugiyama Takeshi , Ukaji Yutaka
Published: May 2006

Oxygen functionalized chiral alkoxymethylketone, derived from (2R,4R)-2,4-pentanediol, provided an efficient chiral environment in the reaction with organometallics which resulted in the either stereoselection depending on metal used; i.e., the reactions with MeLi and MeTi(OiPr)3 selectively furnished the corresponding (S)-and (R)-tertiary alcohols, respectively.
Epoxidation of α,β-Unsaturated Carboxylic Acids with Hydrogen Peroxide by Heteropoly Acids
Authors: Oguchi Takahito , Sakata Yasuyuki , Takeuchi Naotoshi , Kaneda Kimio , Ishii Yasutaka , Ogawa Masaya
Published: May 2006

The epoxidation of α,β-unsaturated carboxylic acids with 35%-H2O2 was carried out by the use of heteropoly acids (HPA) as catalyst. Among the HPA examined, CWP, prepared from 12-tungstophospholic acid (WPA) and cetylpyridinium chloride (CPC), was found to be the most efficient catalyst. The CWP-H2O2system provides an alternative method to prepare epoxy acids.
Diastereoselective Addition of Organometallics to N-(α-Ketoacyl)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine
Authors: Kawanami Yasuhiro , Fujita Izumi , Ogawa Shiho , Katsuki Tsutomu
Published: May 2006

The nucleophilic addition of organometallics to α-keto amides having (2R,5R)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine as a chiral auxiliary was studied and it was found that the sense and degree of diastereoselection strongly depended on organometallics and the reaction conditions used and that the diastereomeric hydroxy amides was obtained with high stereoselectivity by the choice of appropriate reaction conditions.
A Synthesis of (±)-Khusilal
Authors: Hagiwara Hisahiro , Akama Tsutomu , Uda Hisashi
Published: May 2006

(±)-Khusilal, a C14-terpenoid isolated from North Indian vetiver oil, has been synthesized from the decalone derivative prepared by a double Michael reaction.
A Highly Enantioselective Synthesis of 2-Substituted Malates by Asymmetric Aldol Reaction
Authors: Kobayashi Shu , Fujishita Yuko , Mukaiyama Teruaki
Published: May 2006

In the presence of a chiral promoter consisted of chiral diamine coordinated tin(II) triflate and tributyltin fluoride, silyl enol ether of S-ethyl ethanethioate reacts with α-ketoesters to afford the corresponding aldol-type adducts, 2-substituted malates, in good yields with excellent enantiomeric excesses.
A Tungsten Carbonyl Complex [W(CO)(Ph2PCH2CH2PPh2)2] Present as a Mixture of Two Species Having Agostic Interaction or Ortho-Metallation and Its Reaction with Hydrogen Gas
Authors: Ishida Toyohisa , Mizobe Yasushi , Hidai Masanobu
Published: May 2006

A tungsten carbonyl complex [W(CO)(dpe)2] (dpe = Ph2PCH2CH2PPh2) exists in solution as a mixture of two species, one of which has an agostic interaction and the other has an ortho-metallation between one ortho hydrogen of the dpe ligand and the tungsten atom. This carbonyl complex reacted with H2 gas to give a dihydrido complex [WH2(CO)(dpe)2].
Energy Barriers for the Ring Inversion of 1,2:3,4:5,6-Tris(bicyclo[2.2.2]octeno)- and 1,2,3,4,5,6-Hexamethylcycloheptatrienes
Authors: Aonuma Shuji , Komatsu Koichi , Takeuchi Ken’ichi
Published: May 2006

The energy barriers for the cycloheptatriene ring inversion of the titled compounds were determined by dynamic NMR method. It was clarified that annelation with three rigid bicyclooctene units brings about much less steric destabilization to the planar form of the ring as compared with substitution with six methyl groups. This result was supported by molecular mechanics calculations.
Novel Formations of Unsymmetrical 1,2,5-Benzotrithiepins from Olefins and Benzopentathiepin in the Presence of Lewis Acid. Benzopentathiepin as a Novel 1,5-Dipole Synthon
Authors: Sato Ryu , Onodera Akira , Goto Takehiko , Saito Minoru
Published: May 2006

Some unsymmetrical 1,2,5-benzotrithiepins were synthesized in moderate to good yields by the novel reactions of various olefins with benzopentathiepin (BPT) in the presence of a Lewis acid, trifluoroborane etherate. In this reaction, BPT was found to serve as a 1,5-dipole synthon.
Characterization of a Perhydro-5,6-di(methylene)-2,4-dioxopyrimidine Intermediate and Its Cycloaddition Reactions Leading to Quinazoline Derivatives
Authors: Noguchi Michihiko , Doi Kenji , Kiriki Yasutoshi , Kajigaeshi Shoji
Published: May 2006

Perhydro-5,6-di(methylene)-2,4-dioxopyrimidine derivative, a useful intermediate for the synthesis of some fused pyrimidines, was characterized as the [4+2] cycloadduct to N-methylmaleimide.
Novel Photocyclization between Quinone and 1,1-Diphenylcyclopropane
Authors: Maruyama Kazuhiro , Imahori Hiroshi , Ozawa Yoshiki
Published: May 2006

Photochemical reaction of 2,3-dichloro-1,4-naphthoquinone with 1,1-diphenylcyclopropane gave a spirofuran adduct as the sole photoproduct.
Cyclo-((S)-leucyl-(S)-histidyl). A Catalyst for Asymmetric Addition of Hydrogen Cyanide to Aldehydes
Authors: Mori Atsunori , Ikeda Yoshitaka , Kinoshita Koichi , Inoue Shohei
Published: May 2006

Asymmetric addition of hydrogen cyanide to various aldehydes in the presence of a catalytic amount of cyclo-((S)-leucyl-(S)-histidyl) affords the corresponding cyanohydrins in moderate to good optical yields. The reaction of benzaldehyde with hydrogen cyanide gives (S)-2-hydroxy-2-phenylacetonitrile (85%, 55% ee) whose stereochemistry is found to be opposite to our previous result using cyclo-((S)-phenylalanyl-(S)-histidyl).
Synthesis of Conformationally Restricted Dimeric Porphyrins Unsymmetrically Linked with Quinone
Authors: Osuka Atsuhiro , Ida Kazutaka , Nagata Toshi , Maruyama Kazuhiro , Yamazaki Iwao , Tamai Naoto , Nishimura Yoshinobu
Published: May 2006

Unsymmetrically quinone-substituted porphyrin dimers were synthesized. The fluorescence of the both porphyrins in these models was effectively quenched by the attached quinone.
1-O-Palmityl-D-glucuronate Endows Liposomes with Long Half-Life In Vivo
Authors: Namba Yukihiro , Sakakibara Toshiyuki , Masada Mikio , Ito Fumiaki , Oku Naoto
Published: May 2006

More liposomes containing 1-O-palmityl-D-glucuronic acid (PGA), a synthetic glycolipid, bound to macrophages than those containing phosphatidylglycerol did in vitro; however, PGA-liposomes circulated longer in vivo. PGA-liposomes did not aggregate in the presence of serum, but liposomes containing 1-O-palmityl-D-glucose or myristic acid aggregated rapidly, suggesting that both carbohydrate and carboxyl group of PGA are important for preventing liposomal aggregation in serum. This low agglutinative character may be one of the factors for long circulation of PGA-liposomes in vivo.
Laser-induced Highly Selective Synthesis of Ethylene Glycol from Methanol in the Presence of Hydrogen Peroxide
Authors: Shimizu Yuichi , Sugimoto Shun’ichi , Kawanishi Shunichi , Suzuki Nobutake
Published: May 2006

Ethylene glycol was highly selectively synthesized in high quantum yield by KrF-laser irradiation of the N2-saturated methanol containing hydrogen peroxide.
A New Method for the Synthesis of Protected Chiral 4-Hydroxy-2-cyclopentenone
Authors: Kitano Yasunori , Okamoto Sentaro , Sato Fumie
Published: May 2006

A new method for the synthesis of (R)-4-t-butyldimethylsiloxy-2-cyclopentenone (1, R = t-BuMe2-Si) has been developed which involves the effective preparation of the chiral (Z)-γ-iodo allylic alcohol and its conversion into 1 via cycliacylation reaction.
Photochromic Systems Utilizing the Reversible Photoredox Reactions between a Flavin Analogue and Benzenethiol Derivatives
Authors: Ishikawa Masashi , Fukuzumi Shunichi , Tanii Kumiko
Published: May 2006

Irradiation of a yellowish flavin analogue, riboflavin-2′,3′,4′,5′-tetra-acetate (Fl) in a polymer matrix film as well as in acetonitrile containing benzenethiol derivatives and a base with visible light (λ > 360 nm) results in the decrease in absorbance due to Fl (λmax 442 nm). The color reverts to yellow by irradiation of the samples with ultraviolet light (λ < 360 nm).
Nucleophilic Catalysis in the Hydrolysis of Methoxymethyl Benzenesulfenate, a Formaldehyde Acetal
Authors: Okuyama Tadashi , Fueno Takayuki
Published: May 2006

Acid-catalyzed hydrolysis of methoxymethyl benzenesulfenate is accelerated by nucleophiles (Cl−, Br−, I−, R2S, AcO− tertiary amines, and the substrate itself) through the attack at the proformyl carbon while water attacks at the sulfenyl sulfur.
Surface Property of the Langmuir–Blodgett Films of Polymers Modified with Perfluoroalkyl Groups by Ether Bonds
Authors: Tamura Masanori , Sekiya Akira
Published: May 2006

o- And p-1,1-dihydroperfluoroalkoxyphenyl groups were introduced to polyallylamine and Langmuir–Blodgett films of the polymers were successfully prepared. Characterization of the films indicated that the surface energy becomes lower by introduction of perfluoroalkyl chains by ether bonds instead of carbon–carbon bonds in the polymer, and very low γc value, less than 10 dyn cm−1, was achieved.
Laser Breakdown Spectrochemical Analysis of Microparticles in Liquids
Authors: Kitamori Takehiko , Matsui Tetsuya , Sakagami Masaharu , Sawada Tsuguo
Published: May 2006

A focused pulsed laser beam was irradiated on a CaCO3 microparticle in water, and a laser breakdown of single microparticle was induced. In the laser breakdown plasma emission spectrum, the emission lines of Ca I and Ca II were observed, while these lines did not appear for the Ca2+ aqueous solution. Hence this method is effective for analysis of microparticulate impurities in liquids.
Detection of Bimodal Inclusion Complexes of Heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin with Naphthalene Derivatives Using Fluorescence Spectroscopy
Authors: Nakamura Asao , Saitoh Kunihiko , Toda Fujio
Published: May 2006

Simultaneous formation of two types of 1:1 complexes of 6-(4-methylphenylamino)-2-naphthalenesulfonate (6,2-TNS) with heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TMCD) in solution was detected by fluorescence spectroscopy. Fluorescence titration supported the formation of 1:1 complexes. However, the observed fluorescence spectrum was resolved into two components by time-resolved spectroscopy.
Binding of a Fluorescent Oligonucleotide to a Circularized Intervening Sequence from Tetrahymena thermophila
Authors: Sugimoto Naoki , Sasaki Muneo , Kierzek Ryszard , Turner Douglas H
Published: May 2006

Binding behavior of a fluorescent oligonucleotide εACUCU to a circularized intervening sequence from Tetrahymena thermophila has been investigated by fluorescence titration. The binding constant was 9.5 × 106 mol−1 dm3 at 10 °C, roughly 3 orders of magnitude larger than expected for simple Watson–Crick base pairing.
HCl-Vapour-Etching for the Preparation of Monolayer V2O5/TiO2 Catalysts with High Exposure of Active Sites
Authors: Okada Koichi , Satsuma Atsushi , Hattori Tadashi , Murakami Yuichi
Published: May 2006

A novel method was proposed for the preparation of monolayer V2O5/TiO2 catalysts with very high exposure of active sites. In the method, extra vanadium species in highly loaded V2O5/TiO2 catalysts are selectively etched by HCl vapour.
Ion-Associate Solvent Extraction of Gallium(III) from Aqueous Sodium Hydroxide Solution
Authors: Obi Hideki , Segawa Tadashi , Yotsuyanagi Takao
Published: May 2006

Gallium(III) was extracted as Q3[GaL3] from 1–4 mol/dm3 NaOH solutions by the combined use of o-dihydroxy derivatives of benzene or naphthalene (H2L) and asymmetric quarternary ammonium ions (Q+) having at least one methyl-group. Hydrophobic large alkyl groups are an essential constituent of the extractant, while disposition of them is not necessarily restricted on the ligands (H2L), but on the counter ions (Q+). These findings provide a new basis for designing the reagent suitable for the ion-association extraction of metal ion from the strongly alkaline media.
Salt-Induced Photoamination of Arenes by Aliphatic Amines via Arene/p-Dicyanobenzene Exciplexes. A Mechanism for Salt Effects on Charge Separation of Exciplexes
Authors: Yasuda Masahide , Matsuzaki Yoriaki , Yamashita Toshiaki , Shima Kensuke
Published: May 2006

Salt Effects on arene/p-dicyanobenzene exciplexes which undergo photoamination of arenes with aliphatic amines in the presence of tetra-n-butylammonium tetrafluoroborate are investigated. From a kinetic analysis it is found that the photoamination proceeds via charge-separation of the exciplexes with the salt followed by nucleophilic addition of aliphatic amines.
The Effects of cis-Coordinating Phosphine of Chiral Bisphosphine–Rhodium Complexes on the Catalytic Activities in the Asymmetric Hydrogenation of Itaconic Acid
Authors: Takahashi Hisashi , Yamamoto Naoko , Takeda Hideo , Achiwa Kazuo
Published: May 2006

The effects of cis-coordinating phosphine of the rhodium complexes of BCPM ((2S,4S)-N-(t-butoxycarbonyl)-4-(dicyclohexylphosphino)-2-[(diphenylphosphino)methyl]pyrrolidine) analogues bearing electron donating or attracting groups on the catalytic activities in the asymmetric hydrogenation of itaconic acid are described.