bluuebunny/crossref_metadata_2025 huggingface dataset:
Cleavage of Co-C Bond in a Cobaltathiirane by Hydrogen Chloride and Reformation of Co-C Bond by Tetrabutylammonium Fluoride
Authors: Kajitani Masatsugu , Kawakita Fumiko , Chikuma Eri , Sakurada Masami , Akiyama Takeo , Sugimori Akira
Published: March 2006

The cobaltadithiolene complex, (η5-cyclopentadienyl)(1-methoxycarbonyl-1,2-ethenedithiolato)cobalt(III) (1a) reacts with trimethylsilyldiazomethane by formal addition of Me3SiCH to the Co-S bond to afford a cobaltathiirane (2a). Addition of hydrogen chloride to 2a causes the cleavage of the Co-C bond to give chloro(η5-cyclopentadienyl)[[1-(trimethylsilyl)methylthio-κS]-1-methoxycarbonylethene-2-thiolato-κS]cobalt(III)(4a). By the reaction with tetrabutylammonium fluoride in THF, 4a undergoes loss of Cl and Me3Si to afford (η5-cyclopentadienyl)[(methylene-κC-thio-κS)-1-methoxycarbonylethene-2-thiolato-κS]cobalt(III)(2c).
Selective Cyclotrimerization of Acetylenes via Tantalum-Alkyne Complexes
Authors: Takai Kazuhiko , Yamada Masashi , Utimoto Kiitiro
Published: March 2006

Tantalum-alkyne complexes prepared from internal acetylenes and low-valent tantalum (TaCl5 and Zn) in DME and benzene react with terminal diynes in the presence of THF and pyridine to give tetrasubstituted benzene derivatives in good to excellent yields.
Relative Configuration of a Marine Toxin Polycavernoside-A
Authors: Fujiwara Kenshu , Amano Seiji , Murai Akio
Published: March 2006

Combination of the sugar and tetrahydropyran parts of polycavernoside-A, which has been isolated as one of toxic principles from the red alga Polycavernosa tsudai, revealed the whole relative configuration of the compound from the spectral data.
Product-Selectivity Control in an Electroorganic Process by Temperature. Electroreduction of Acetophenone
Authors: Tsunashima Katsuhiko , Nonaka Tsutomu
Published: March 2006

Product-selectivity for the electroreduction of acetophenone to the corresponding hydrodimeric and hydromonomeric products was greatly affected by temperature.
Quadrupolar [14](meta-para)2Heterophanes and [14]metaHeterophanes Containing Stable 3,5-Bis[1-methyl-4(3)-pyridiniomethyl]-1,2,4-triazolate Building Block
Authors: Alcalde Ermitas , Gisbert Maria , Pérez-García Lluïsa
Published: March 2006

Access to novel quadrupolar [14] (meta-para)2azolophane with a 3,5-bis[1-methyl-4-pyridiniomethyl]-1,2,4-triazolate subunit reveals that the structural features conferred by the heterophane architecture lead to molecules that are stable to oxidation, in contrast with their building block. The stability of [14]metaazolophanes is consistent with the betainic subunits.
Synthesis, Structure, and Magnetic Properties of Dinuclear Copper(II) Complexes with Novel Triple Carboxylato-Bridging Linkages
Authors: Matsushima Hideaki , Koikawa Masayuki , Nakashima Michio , Tokii Tadashi
Published: March 2006

Novel triply carboxylato-bridged dinuclear copper(II) complexes, [Cu2(Ph2CHCOO)3(L)2]BF4, where L is bpy or phen, have been prepared. X-Ray structural analyses have revealed that each complex consists of a dicopper(II) core with unusual bridging geometries (syn-syn and μ2,η1 carboxylato-modes) reflected the versatility of carboxylates as bridging ligands. Magnetic susceptibility measurements for the present complexes show a weak antiferromagnetic coupling.
A Facile Preparation of Cesium Tellurocarboxylates. The First X-Ray Structural Analysis of a Tellurocarboxylic Acid Alkali Metal Salt
Authors: Kawahara Yasuyuki , Kato Shinzi , Kanda Takahiro , Murai Toshiaki
Published: March 2006

Crystalline cesium tellurocarboxylates have been isolated from the reaction of O-trimethylsilyl tellurocarboxylates with cesium fluoride and characterized by X-ray crystallographic analysis which showed a C–Te single bond (2.107 Å) and the possibility of localization of the negative charge on the Te atom.
Oxidative Esterification of Primary Alcohols by NaBrO3/NaHSO3 Reagent in Aqueous Medium
Authors: Takase Kiyoshi , Masuda Haruyoshi , Kai Osamu , Nishiyama Yutaka , Sakaguchi Satoshi , Ishii Yasutaka
Published: March 2006

NaBrO3 combined with NaHSO3 was found to be an efficent reagent for the oxidative esterification of primary alcohols. Thus, a variety of esters was prepared from primary alcohols, aldehydes, and acetals in aqueous medium under mild conditions. Treatment of α,ω-diols with NaBrO3/NaHSO3 reagent afforded the corresponding lactones and/or dicarboxylic acids in fair yields.
Implicit Role of Hydrogen Peroxide on Phytoalexin Production in Higher Plants
Authors: Murai Akio , Sato Kaoru , Hasegawa Toshio
Published: March 2006

Sweet potato, kidney bean, and sugar beet, when infected with Fusarium roseum, Fusarium solani, and Rhizoctonia solani, respectively, generated H2O2 which then elicited accumulation of the phytoalexins in the respective cases. The three intact plant tissues, only when treated with H2O2, induced phytoalexin production, respectively.
Important Role of Tetrahydrofuran Ring in Activation of Hydrogen Peroxide in the Presence of Binuclear Iron(III) Complexes with Linear μ-Oxo Bridge
Authors: Nishida Yuzo , Okuno Takashi , Ito Sayo , Harada Akihiko , Ohba Shigeru , Matsushima Hideaki , Tokii Tadashi
Published: March 2006

Binuclear μ-monooxo bridged iron(III) complex with tripodal-like ligand containing tetrahydrofuran ring exhibits much higher activity for alkane hydroxylation reaction in the presence of hydrogen peroxide than that of pyridine analogue; origin for high activity of the former complex was developed.
Effect of Polyaniline-coated Surface on the Formation of Multicellular Spheroids of Hepatocytes
Authors: Kawase Masaya , Michibayashi Nobuyasu , Yoshimura Yuriko , Yamada Chikaomi , Sumiyoshi Nobuaki , Yagi Kiyohito , Mizoguchi Tadashi
Published: March 2006

Polyaniline was formed on indium tin oxide coated glass by electrochemical method. On the polyaniline surface, hepatocytes from adult rat rapidly formed multicellular spheroids for 2 days, and showed high amount production of albumin. It is shown that polyaniline is suitable for hepatocytes culture.
Photochromism of Single Crystalline Diarylethenes
Authors: Irie Masahiro , Uchida Kingo , Eriguchi Takeshi , Tsuzuki Hirohisa
Published: March 2006

1,2-Bis(2,4-dimethy-3-thienyl)perfluorocyclopentene was found to undergo a reversible photochromic reaction in a single crystalline phase with rotation of the thiophene rings. Both the open-ring colorless and the photogenerated red isomers were thermally stable even at 100 °C. Coloration/decoloration cycles could be repeated more than 100 times without destruction of the crystal shape. Regular alignment of the photogenerated colored isomers in the crystal was evidenced by the absorption measurement under linearly polarized light.
Solubilization of a Brown Coal in a Solvent Mixture of Methanol and a Non-polar Solvent at Room Temperature
Authors: Miura Kouichi , Mae Kazuhiro , Maki Taisuke , Araki Jun
Published: March 2006

A new method was developed for solubilizing a brown coal in a conventionally used solvent at room temperature. The coal pretreated with hydrogen peroxide in liquid phase at 60 °C for 2 h was extracted by solvent mixtures of methanol and a non-polar solvent by the conventional method. In the solvent consisting of methanol and 1-methyl-naphthalene (0.54:0.46 volumetric ratio), surprisingly, 84 wt% of the pretreated coal were extracted.
Microelectrode-Detected Electron Spin Resonance (MEDESR) Signals of Free Radicals in Electrolyte Solutions
Authors: Yokoyama Hidekatsu , Satoh Toshiyuki , Ohya-Nishiguchi Hiroaki , Kamada Hitoshi , Kasai Nahoko , Matsue Tomokazu
Published: March 2006

The ESR spectra of stable free radical in solution have first been detected through potential change between two electrodes inserted in the solution. The working electrode (φ 50 μm) was biased by a constant current source under microwave irradiation and modulated magnetic field. The AC component of the potential on resonance was preamplified and detected by a lock-in amplifier. The sensitivity of this method, 5 × 106 spins/G, is 103 higher than those of conventional ESR spectrometers.
Molecular Imprinting of Theophylline in Acrylonitrile-acrylic Acid Copolymer Membrane
Authors: Kobayashi Takaomi , Wang Hong Ying , Fujii Nobuyuki
Published: March 2006

Molecular size of Theophylline was imprinted in ultrafiltration membrane of poly(acrylonitrile-co-acrylic acid), when the membrane was prepared by phase inversion method. Evidence was presented by the permeation experiments that the Theophylline solute binds more strongly to the imprinted membrane.
Synthesis and Photochemical Properties of the Orthogonal Porphyrin Triad Composed of Free-Base and Phosphorus(V) Porphyrins
Authors: Susumu Kimihiro , Segawa Hiroshi , Shimidzu Takeo
Published: March 2006

A novel triad molecule composed of three porphyrins was synthesized by the use of the axial substitution of phosphorus(V) porphyrin. Photochemical properties of the triad suggest that the photoinduced electron transfer was accomplished.
Decomposition of Methane over Ni/SiO2 Catalysts with Membrane Reactor for the Production of Hydrogen
Authors: Ishihara Tatsumi , Miyashita Yumi , Iseda Hiroshi , Takita Yusaku
Published: March 2006

Decomposition of CH4 to C and H2 on Ni/SiO2 catalyst was investigated with membrane reactor consisting of 90Pd10Ag alloy tube for the production of H2. Application of membrane reactor was effective for increasing the yield of H2 and consequently, CH4 conversion far exceeded the equilibrium conversion of closed system by using the membrane reactor.
Effect of the Addition of Nitrogen Dioxide on the Gas-Phase Partial Oxidation of Methane with Oxygen under Normal Pressures
Authors: Han Li-Biao , Tsubota Susumu , Haruta Masatake
Published: March 2006

The addition of NO2 to the gas-phase reaction of CH4 with O2 conducted under normal pressures at temperatures of 400∼460 °C enhances the partial oxidation of methane with improved selectivities to organic products.
Syntheses and Crystal Structures of Novel Antimony-Containing Cyclic Polysulfides
Authors: Tokitoh Norihiro , Arai Yoshimitsu , Harada Jun , Okazaki Renji
Published: March 2006

The reaction of a dihydrostibine bearing a 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) group, TbtSbH2, with elemental sulfur resulted in the formation of two kinds of novel Sb-containing cyclic polysulfides, TbtSbS5 and TbtSbS7, together with another type of two cyclic polysulfides having two TbtSb units, 1,3,4,5,2,6-tetrathiadistibane and 1,3,5,2,4-trithiadistibolane derivatives.
Super-Secondary Structure with Amphiphilic β-Strands Probed by Pyrenylalanine
Authors: Ono Shin , Kameda Naoyoshi , Yoshimura Toshiaki , Shimasaki Choichiro , Tsukurimichi Eiichi , Mihara Hisakazu , Nishino Norikazu
Published: March 2006

A peptide composed of two amphiphilic β-strands was designed and synthesized. The circular dichroism and fluorescence spectra of l-1-pyrenylalanine introduced in each segment probed that a super-secondary structure with two β-strands was formed with a left-handed twist and transformed to α-helices by the addition of trifluoroethanol.
Structure and Vibrational Spectra of Trinuclear Metal Cluster Complexes. A Question of Symmetry
Authors: Ohto Akihiro , Tokiwa-Yamamoto Ayako , Abe Masaaki , Ito Tasuku , Sasaki Yoichi , Umakoshi Keisuke , Cannon Roderick D
Published: March 2006

Symmetry of the oxo-centered tri-ruthenium(III) complexes, [Ru3(O)(OOCR)6(L)3]+ (R = CH3, C6H5; L = pyridine, H2O), is discussed on the basis of the shapes of υas(OCO) bands in infra-red spectra, using comparisons between these complexes and related tri-rhodium(III) and mixed-metal Ru(III)2M complexes. It is suggested that the tri-ruthenium(III) complexes have non-threefold symmetry.
Unusual Solvent Effect on Absorption Spectra of Nonplanar Dodecaphenylporphyrin Caused by Hydrogen-Bonding Interactions
Authors: Takeda Jun , Sato Mitsuo
Published: March 2006

UV-vis absorption spectra of nonplanar dodecaphenylporphyrin H2DPP show a strong solvent dependence caused by the hydrogen-bonding interactions of pyrrole NH protons and pyrrolenine nitrogen lone pairs with solvent molecules.
In Situ Observation of Domain Structure in Monolayers of Tetraphenylporphyrin Derivatives Containing Four Fluorocarbon Chains by Brewster Angle Microscope
Authors: Liang Wei , Nakahara Hiroo
Published: March 2006

The morphologies in monolayers of tetraphenylporphyrin derivatives with four fluorocarbon chains have been observed in situ on the water surface by a Brewster angle microscope (BAM). It has been suggested that the homogeneity of the monolayers depends upon the chain length of substituents for the porphyrin derivatives and in the case of the shorter chain the nucleation and the process of growing crystallines in the monolayers can be clearly observed at zero surface pressure or on compression.
Intramolecular T2-Energy Transfer from Anthryl Group Studied by Stepwise Two-Color Two-Photon Excitation: A Cis to Trans Isomerization and a Valence Isomerization
Authors: Okada Keiji , Sakai Hidekazu , Oda Masaji , Kikuchi Koichi
Published: March 2006

Intramolecular energy transfer from the second triplet of anthracene moiety is exemplified in the cis to trans isomerization of methyl maleate and the valence isomerization of norbornadiene to quadricyclane by stepwise two-color two-photon excitation method.
Acid-isomerization of 3,4-Dimethyl-4-homoadamantyl Cation to 3-Ethyl-5-methyl-1-adamantyl Cation. A Unique Method for Construction of an Adamantyl Framework Having Two Alkyl Groups on the Bridgehead Positions
Authors: Okazaki Takao , Kitagawa Toshikazu , Takeuchi Ken’ichi
Published: March 2006

Ionization of 3,4-dimethyl-4-homoadamantanol with FSO3H/SbF5 in SO2ClF irreversibly afforded the 3-ethyl-5-methyl-1-adamantyl cation (9) at −30 °C, which was directly observed by 13C NMR. Trapping of 9 with methanol gave the corresponding methyl ether in 71% yield, suggesting that the acid-isomerization of 3,4-dialkyl-4-homoadamantanols may be conveniently used for preparation of 1,3-dialkyladamantane derivatives.
A Remarkable Difference in the Reactivity between cis- and trans-Silylplatinum Complexes toword Insertion of Acetylene
Authors: Hikida Toshihiko , Onitsuka Kiyotaka , Sonogashira Kenkichi , Hayashi Tamio , Ozawa Fumiyuki
Published: March 2006

Reaction of cis-PtMe(SiPh3)(PMe2Ph)2 (1) with phenylacetylene in benzene readily proceeds at room temperature to give the acetylene-insertion product cis-PtMe{C(Ph)=CH(SiPh3)}(PMe2Ph)2, while trans-PtMe(SiPh3)(PMe2Ph)2 (2), which is the geometrical isomer of 1, is inactive toward acetylene-insertion. A mechanism of insertion involving a five-coordinate intermediate is proposed to account for the marked difference in the reactivity between the cis and trans isomers.
First Conversion of a Square-planar [Ni(aet)2] to an Octahedral [Ni(aet)2L] by Forming S-Bridged Structure with Pt(II) (aet = 2-Aminoethanethiolate; L = (H2O)2 or 2,2′-Bipyridine)
Authors: Konno Takumi , Yoshinari Yukie , Okamoto Ken-ichi
Published: March 2006

The reaction of [Ni(aet)2] (aet = 2-aminoethanethiolate) with [PtCl2(bpy)] (bpy = 2,2′-bipyridine) in water led to the geometrical conversion of NiII from square-planar to octahedral, giving a novel S-bridged PtIINiII complex, [Pt(bpy){Ni(aet)2(H2O)2}]2+ (1). 1 readily reacted with bpy in water to produce [Pt(bpy){Ni(aet)2(bpy)}]2+ (2), of which structure was determined by X-ray crystallography.
Photochemical Polymerization of Oligothiophenes
Authors: Fujitsuka Mamoru , Sato Tadatake , Segawa Hiroshi , Shimidzu Takeo
Published: March 2006

Photochemical polymerization of oligothiophenes was investigated from steady-state and laser-flash photolysis. Photo-irradiation to bithiophene or terthiophene solutions containing p-dinitrobenzene or CCl4 gave their α-linked polymers. It was concluded that the coupling reaction of oligothienyl radicals formed through the photoinduced electron transfer from the excited oligothiophenes to the electron acceptor resulted in a formation of polymeric products.
Buffer Effects on the Ring Opening of Cyclic Sulfinate Esters as Evidence for the Hypervalent Intermediate
Authors: Okuyama Tadashi
Published: March 2006

Ring opening of dibenzo-1,2-oxathiin 2-oxide (1a) and 3,4-dihydro-1,2-benzoxathiin 2-oxide (1b) is accelerated by buffer bases while that of 3H-2,1-benzoxathiole 1-oxide (1d) is essentially independent of buffer concentrations in tertiary amine buffers or decelerated in some buffers. These results are taken as evidence for the hypervalent intermediate of this reaction.
Novel Hg2+-Ionophores Based on N-Hydroxylamide Derivatives as a Sensory Molecule for an Ion-Selective Electrode
Authors: Siswanta Dwi , Kin Masanori , Hisamoto Hideaki , Suzuki Koji
Published: March 2006

Several N-hydroxylamide derivatives were developed, exhibiting high selectivity for Hg2+, which are useful as sensory molecules for a potentiometric ion sensor.
Persistent Spectral Hole Burning of Resazurin Sodium Salt in Glassy Polymer Matrices
Authors: Nishiyama Satoko , Machida Shinjiro , Yamashita Takashi , Horie Kazuyuki
Published: March 2006

The first persistent spectral hole burning is reported for an acidic dye, resazurin anion (sodium salt), containing N-oxide moiety. The spectral hole was measured in three polymer matrices. The temperature dependence of holewidth for resazurin and the thermal stability of the burnt hole were measured and compared with those of a similar dye, resorufin.
A Novel Evaluation Method for the Adsorption Energy of Terminally Adsorbed Polymer
Authors: Chen Ming-Hua , Furusawa Kunio
Published: March 2006

Using a new experimental technique, “continuous elution method”, polystyrene (PS-X) functionalized by a terminal iminium ion(X) was found forming a terminally adsorbed polymer layer on α-Al2O3 surface. Based on the balance between adsorption and desorption, the adsorption energy of the terminally adsorbed polymer was evaluated to be 4.2∼4.3 kT with regarding to the osmotic pressure as a desorption force.
A Simple Method for the Conversion of Primary Alcohols into Terminal Olefins
Authors: Matsushita Masayuki , Nagaoka Yoko , Hioki Hideaki , Fukuyama Yoshiyasu , Kodama Mitsuaki
Published: March 2006

Treatment of benzyl ethers of primary alcohols with n-butyllithium (n-BuLi) afforded terminal olefins in good yield.
Cyclodimerization of α,β-Unsaturated Ketones Catalyzed by Lanthanoid Tri-2-propoxides
Authors: Okano Tamon , Ohno Katsutoshi , Kiji Jitsuo
Published: March 2006

α,β-Unsaturated ketones are cyclodimerized by the catalysis of lanthanoid tri-2-propoxides into substituted cyclohexanones in good yields. The catalytic activity of the lanthanoids is fairly superior to those of the sodium or aluminum propoxides.
Enantioselective, Electrocatalytic Lactonization of Methyl-substituted Diols on a TEMPO-modified Graphite Felt Electrode in the Presence of (−)-Sparteine
Authors: Yanagisawa Yoshinori , Kashiwagi Yoshitomo , Kurashima Futoshi , Anzai Jun-ichi , Osa Tetsuo , Bobbitt James M
Published: March 2006

A TEMPO (2,2,6,6-tetramethylpiperidin-1-yloxyl)-modified graphite felt electrode afforded enantioselective, electrocatalytic lactonized products of (S)-(−)-3,4,5,6-tetrahydro-4-methyl-2-pyranone, (S)-(−)-4,5-dihydro-4-methyl-2(3H)-furanone and (S)-(−)-4,5-dihydro-5-methyl-2(3H)-furanone from 3-methylpentane-1,5-diol, (S)-(−)-2-methylbutane-1,4-diol and racemic pentane-1,4-diol, respectively, in enantiomeric excess more than 95%, in the presence of (−)-sparteine in acetonitrile. The current efficiency and isolated yield of former two lactones were more than 90%.
The Use of Hydrophilic Counterion for Superior Retention and Separation of Anionic Metal Chelates in Reversed-Phase Partition High Performance Liquid Chromatography
Authors: Kaneko Emiko , Noda Hiroyuki , Hoshino Hitoshi , Yotsuyanagi Takao
Published: March 2006

It has been found that hydrophilic ions, such as protonated tris(hydroxymethyl)aminomethane (H+THMAM), are eminently suitable as counterion for reversed-phase partition high performance liquid chromatography. The anionic metal chelates with 2,2′-dihydroxyazobenzene were separated on C18-bonded silica packing with an aqueous methanol mobile phase (pH 7.9) containing THMAM, and detected spectrophotometrically.
Photocatalytic Mineralization of Acetic Acid in Aerated Aqueous Suspension of Ultra-highly Active Titanium(IV) Oxide Prepared by Hydrothermal Crystallization in Toluene
Authors: Kominami Hiroshi , Kato Jun-ichi , Kohno Masaaki , Kera Yoshiya , Ohtani Bunsho
Published: March 2006

Anatase titanium(IV) oxide synthesized by high-temperature hydrolysis of titanium(IV) tetrabutoxide in toluene was used for photocatalytic mineralization of acetic acid in aerated aqueous solutions, and showed the rate of carbon dioxide production much higher than representative active photocatalysts (Degussa P-25 and Ishihara ST-01). The catalyst of the larger crystallite size showed the higher activity, suggesting the importance of reduction of crystal defects.
Intramolecular Oligomerization of Disilalkylene {-Me2Si(CH2)nSiMe2-} Bridged Cyclic Triacetylenes
Authors: Ebata Keisuke , Matsuo Tsukasa , Inoue Tsuyotoshi , Otsuka Yuko , Kabuto Chizuko , Sekiguchi Akira , Sakurai Hideki
Published: March 2006

Disilalkylene bridged cyclic triacetylenes are prepared and subjected to the transition metal complex mediated reactions. In particular, the reaction with (methylcyclopentadienyl)tricarbonylmanganese gave a variety of π-electron systems such as fulvene, dimethylenecyclobutene, and biallene. Structures and reactions of these π-electron systems are described.
Nitric Oxide Release from Porcine Aorta Endothelial Cells Measured by Electron Paramagnetic Resonance Spectroscopy
Authors: Fujii Satoshi , Miyakoda Goro , Chihiro Masatoshi , Yoshimura Tetsuhiko , Kamada Hitoshi
Published: March 2006

Nitric oxide (NO) generation from porcine aorta endothelial cells has been detected by electron paramagnetic resonance spectroscopy in combination with the spin trapping technique at 77 K or −160 °C. Water-soluble iron(III) complex with N-(dithiocarboxy)sarcosine has been used as an NO trapping agent.
Preparation and Characterization of Novel Cage-type Cyclophanes Having Three or Four Bridging Dipeptide Segments
Authors: Hayashida Osamu , Tanaka Akinori , Motomura Koji , Hisaeda Yoshio , Murakami Yukito
Published: March 2006

Novel cage-type cyclophanes constructed with two rigid macrocyclic skeletons, triaza[3.3.3]paracyclophanes or tetraaza[3.3.3.3.]paracyclophanes, and three or four dipeptide moieties, α-l-aspartyl-l-aspartyl residues, were prepared. The guest-binding behavior of the cage-type hosts toward fluorescent guests, such as 8-anilinonaphthalene-1-sulfonate and 6-p-toluidinonaphthalene-2-sulfonate, was examined in comparison with that demonstrated by non-cage hosts toward the identical guests.
Catalytic Hydrogenolysis of Aromatic Halides with Sodium Hydride of Nanometric Size
Authors: Li Haiqing , Liao Shijian , Xu Yun
Published: March 2006

Aromatic halides, such as chlorobenzene and fluorobenzene, can be repidly hydrodehalogenated in 100% conversion by sodium hydride of nanometric size in the presence of a multimetallic catalyst (Ni(OAc)2–TiCl4–i-PrONa).
Enrichment of Ce@C60 by HPLC Technique
Authors: Kubozono Yoshihiro , Hiraoka Koji , Takabayashi Yasuhiro , Nakai Takeshi , Ohta Takayoshi , Maeda Hironobu , Ishida Hiroyuki , Kashino Setsuo , Emura Shuichi , Ukita Shigeyuki , Sogabe Toshiaki
Published: March 2006

Endohedral metallofullerene Ce@C60 has been enriched in the extracted solution of the soot prepared by arc-heating of CeO/graphite composite rods. The enrichment of Ce@C60 in aniline solution containing the hollow and the other endohedral fullerenes have been performed by using high performance liquid chromatography (HPLC) technique. The laser desorption time-of-flight (LD-TOF) mass spectrum shows clearly the enrichment of Ce@C60.
Cr3+-Mediated Addition of Arylzincs to Aldehydes
Authors: Ogawa Yoshihiro , Mori Mitsuo , Saiga Akihiro , Takagi Kentaro
Published: March 2006

Addition of arylzincs to aldehydes was achieved by making use of the novel transmetallation of arylzincs into Cr3+ compounds. Various α-substituted benzyl alcohols or 3-substituted 1(3H)-isobenzofuranones, containing reactive functional groups, were synthesized in good yields. Me3SiCl exerted beneficial effects on the reaction.
Immobilized Lipase Showing High Catalytic Activity toward Enzymatic Ring-Opening Polymerization of Macrolides
Authors: Uyama Hiroshi , Kikuchi Hirofumi , Takeya Kazuhiro , Hoshi Norio , Kobayashi Shiro
Published: March 2006

Immobilized Pseudomonas fluorescens lipase adsorbed on a Celite was used as new catalyst for enzymatic ring-opening polymerization of macrolides. Immobilization in the presence of a sugar or poly(ethylene glycol) greatly enhanced the catalytic activity.
Stable Decarbonylcarbene Complexes of Bis(oxazolinyl)pyridine Ruthenium and Osmium
Authors: Nishiyama Hisao , Aoki Katsuyuki , Itoh Hirofumi , Iwamura Taichiro , Sakata Naoya , Kurihara Osamu , Motoyama Yukihiro
Published: March 2006

The reaction of RuCl2(pybox)(C2H4) [pybox = 2,6-bis(oxazolinyl)pyridine] 1 and OsCl2(pybox)(propylene) 6 with dimethyl diazomalonate gave stable dicarbonylcarbene complexes 9 and 10 in 92% and 59% yields, respectively. The carbene moiety of 9 proved to be almost parallel in the Cl-Ru-Cl plane ny 10–12° and perpendicular to the pybox plane by X-ray analysis. The transfer of the carbene moiety of 9 to styrene could be observed at 110 °C to give the corresponding cyclopropane 15 but in a low yield (11%) with asymmetric induction in 36% ee.
Selective and Efficient Direct Fluorination of Polycyclic Aromatic Hydrocarbons Using 1-Fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane Bis(tetrafluoroborate)
Authors: Stavber Stojan , Zupan Marko
Published: March 2006

A new N-F fluorinating reagent 1-fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (AccufluorTM  NFTh) was effectively used for selective fluorination of polycyclic aromatics. Naphthalene was site-selectively fluorinated to 1-fluoronaphthalene, phenanthrene to 9-fluorophenanthrene, and pyrene to 1-fluoropyrene. In a series of substituted naphthalenes the regioselectivity and effectiveness of fluorination depended on the position and the nature of the substituents.
Highly Efficient and Convenient Regeneration of NADPH for Asymmetric Reduction Using Bakers’ Yeast Cell Free Extract
Authors: Utaka Masanori , Yano Tomoko , Ema Tadashi , Sakai Takashi
Published: March 2006

An asymmetric reduction of ethyl pyruvate was carried out using bakers’ yeast cell free extract with addition of NADPH in catalytic amounts and glucose as a hydride source. The total turnover number of NADPH reached 7680. The efficiency of the cell free extract is discussed.
Synthesis of the Isosteric Analogs of CMP-NeuNAc : Cytidine-5′-yl Sialylmethylphosphonates
Authors: Imamura Masakazu , Hashimoto Hironobu
Published: March 2006

Isosteric CMP-NeuNAc phosphonate analogs (1 and 2) were synthesized from C-allyl-sialoside. These analogs have a methyl phosphonate structure instead of the phosphate linkage of CMP-NeuNAc.
Preparative, Electroenzymatic Reduction of NAD+ to NADH on a Thin Poly(Acrylic Acid) Layer-Coated Graphite Felt Electrode Coimmobilizing Ion-paired Methyl Viologen-Cation-Exchange Polymer and Diaphorase
Authors: Kashiwagi Yoshitomo , Yanagisawa Yoshinori , Shibayama Norihiko , Nakahara Kaname , Kurashima Futoshi , Anzai Jun-ichi , Osa Tetsuo
Published: March 2006

A thin poly(acrylic acid) layer-coated graphite felt electrode coimmobilizing ion-paired methyl viologen – cation-exchange polymer and diaphorase was prepared and applied to preparative electroenzymatic reduction of NAD+ in phosphate buffer at constant potential of −0.80 V vs. SCE. The electrode was stable for the reaction and yielded NADH quantitatively in 97.8% current efficiency.
Simultaneous Determination of Inorganic Anions and Equally Charged Complexes of Transition Metals with Polyaminocarboxylic Acids by Capillary Electrophoresis
Authors: Krokhin Oleg V , Xu Wen-zhe , Hoshino Hitoshi , Shpigun Oleg A , Yotsuyanagi Takao
Published: March 2006

High efficiency Capillary Electrophoresis (CE) separation (440–760 thousand theoretical plates per meter) of metal-edta complexes and inorganic anions has been demonstrated using Kinetic Differentiation mode-Ion-Exchange Electrokinetic Chromatography (EKC). An aromatic homolog of polyaminocarboxylate (Quin 2, see Figure 1) has been used for the increase of the detection sensitivity. The detection limits of transition metals were found in the range of (0.59–1.90) × 10−6 M (M = mol dm−3).
Convenient Synthesis of 1-Fluoroalkyl-2-hydro[60]fullerene Using Fluoroalkyl Halide with Tributyltin Hydride under Radical Conditions
Authors: Yoshida Masato , Suzuki Daiki , Iyoda Masahiko
Published: March 2006

A convenient method for the preparation of fluoroalkyl-modified C60 using fluoroalkyl halides with Bu3SnH under radical conditions has been developed; 1-fluoroalkyl-2-hydro[60]fullerenes at 6,6-junction (C60(RF)H : RF = CF2CO2Et, n-C6F13, CF2Br, n-C12F25, and (CF2)6I) were synthesized effectively.
Analyses of ν1-Band of Methane Adsorbed on Ion-exchanged L-Zeolites
Authors: Yamazaki Tatsuya , Honma Ken-ichi , Katoh Masahiro , Ozawa Sentaro
Published: March 2006

To clarify the nature of cation sites in L-zeolite, an analysis of ν1-IR band of adsorbed methane was carried out. The relation between the peak shift, Δν1, and the strength of electric filed, E, and that between Δν1 and the molar extinction coefficient of induced band, A, were derived on the basis of perturbation theory. Estimating the maximum IR absorption intensity expermentally, the numbers of cations available for methane adsorption in both K- and Rb-exchanged L-zeolites are estimated to be 3 atom/unit cell.
Binuclear Molybdenum(V)porphyrins Bridged by Benzenediolate or Naphthalenediolate Dianion: Cooperative Coordination Equilibrium of Two Molybdenum Centers Involving Electron Transfer
Authors: Kurihara Masato , Saito Ikuko , Matsuda Yoshihisa
Published: March 2006

The reactions of molybdenumporphyrin and an aromatic diol were studied. A cooperative coordination of two hydroxyl groups to molybdenum centers was confirmed.
Ruthenium-Catalyzed Addition of Aromatic Imines at the ortho C–H Bonds to Olefins
Authors: Kakiuchi Fumitoshi , Yamauchi Masakazu , Chatani Naoto , Murai Shinji
Published: March 2006

Additions of aromatic imines at the ortho carbon-hydrogen bonds to olefins were catalyzed by ruthenium complexes affording 1:1 addition products in good to excellent yields. In some cases, a by-product arising from dehydrogenative coupling was also obtained. Both aldimines and ketimines reacted well. Olefins such as styrene, 3,3-dimethyl-1-butene, and ethylene yielded corresponding products in good yields.
Mobility and Exchange of Protons and Methanol Molecules in H3PW12O40 Pseudoliquid Phase Detected by Solid State NMR
Authors: Hirano Yuka , Inumaru Kei , Okuhara Toshio , Misono Makoto
Published: March 2006

The dynamic behavior of CH3OH molecules absorbed in the “pseudoliquid phase” of a heteropolyacid, H3PW12O40, was analyzed by high resolution solid-state 13C, 1H and 31P NMR. When CH3OH absorbed was less than 3 molecules/heteropolyanion, CH3OH molecules were all protonated and the rest of the protons remained presumably directly bonded to the bridging oxygen atoms of heteropolyanion. The hydroxyl protons of CH3OH and the protons of heteropolyacid exchanged rapidly in a wide range of absorption level, and CH3OH molecules became very mobile when the absorption amount exceeded 6 molecules/anion.
Synthesis of Novel Benzobacteriopurpurins by Diels-Alder Cycloaddition
Authors: Zheng Gang , Kozyrev Andrei N , Dougherty Thomas J , Smith Kevin M , Pandey Ravindra K
Published: March 2006

A new class of stable bacteriochlorins, namely benzobacteriopurpurin bearing two exo-cyclic rings was synthesized by way of Diels-Alder cycloaddition of 8-vinyl-mesopurpurin-18 methyl ester with tetracyanoethylene (TCNE) and dimethyl acetylenedicarboxylate (DMAD). These novel bacteriochlorins have long wavelength absorptions in the range of 760 to 795 nm.
Preparation of Novel Poly(aryleneamine)s by Palladium Complex Catalyzed Polycondensation of Dibromobenzenes with Diamines
Authors: Kanbara Takaki , Honma Akira , Hasegawa Kiyoshi
Published: March 2006

The reaction of aryl dibromides with secondary diamines proceeds smoothly in the presence of a stoichiometric base such as NaOtBu and a catalytic amount of palladium complex, PdCl2(P(o-tolyl)3)2 (P(o-tolyl)3 = tri-o-tolylphosphine), in toluene to give the corresponding new poly(aryleneamine)s.
Separation of an Enantiomorph and Its Racemate by Distillation: Strong Chiral Recognizing Ability of Trifluorolactates
Authors: Katagiri Toshimasa , Yoda Chika , Furuhashi Keizo , Ueki Katsuyuki , Kubota Toshio
Published: March 2006

Trifluorolactate experienced modification of its enantiomeric excess by fractional distillation. Quantitative studies have shown that the separation of an enantiomorph and its racemate is due to a change in boiling points that depend on the enantiomeric excess of the compound. Such a change in the boiling point was not seen in the case of the non fluorinated lactate.
Selective Guest Binding onto Nucleic Acid Base Monolayers Immobilized on a Highly Sensitive Quartz-Crystal Microbalance in Gas Phase
Authors: Matsuura Kazunori , Okahata Yoshio
Published: March 2006

Self-assembled monolayers bearing a thymine or adenine base as a terminal group were immobilized on a highly sensitive (63 MHz) quartz-crystal microbalance. Selective binding processes of guest molecules were obtained as mass increases (frequency decreases) in gas phase.
Synthesis of a Bis(silyl)iridium(III) Complex via Oxidative Addition of an Si–Si Linkage to Ir(I) and Its Crystal Structure
Authors: Murakami Masahiro , Yoshida Takashi , Ito Yoshihiko
Published: March 2006

A new bis(trialkylsilyl)iridium(III) complex is synthesized by a process of oxidative addition of an Si–Si linkage to an iridium(I) complex, and the crystal structure is determined by an X-ray analysis.
Fabrication of Novel Electrochemical Reduction Systems Using Alcohol Dehydrogenase as a Bifunctional Electrocatalyst
Authors: Yuan Ruo , Kuwabata Susumu , Yoneyama Hiroshi
Published: March 2006

Electrochemical reduction of NADP+ to NADPH and of NAD+ to NADH with current efficiencies of more than 97% has been achieved at alcohol dehydrogenase (ALDH) in the presence of acetophenone as an electron mediator. Addition of acetone or acetaldehyde as a substrate to the above electrolytic system allowed reduction of the substrate to the corresponding alcohol at ALDH accompanied by oxidation of the resulting NAD(P)H.
Synthesis of 2,3-Diarylquinone by Palladium Catalyzed Cross-Coupling of Dibromoquinones with Heteroarylstannanes
Authors: Yoshida Seigo , Kubo Hiroaki , Saika Tetsuyuki , Katsumura Shigeo
Published: March 2006

The synthesis of various kinds of both symmetrical and asymmetrical diarylquinones has been realized by the palladium catalyzed cross-coupling of 2,3-dibromoquinones with tributylstannylheteroaromatics.
Electrochemical Deacetylation of 1,3-Dicarbonyl Compounds
Authors: Fujimoto Kazuo , Maekawa Hirofumi , Matsubara Yoshiharu , Nishiguchi Ikuzo
Published: March 2006

Mild deacetylation of 1,3-dicarbonyl compounds was achieved by halonium-ion mediated electrolysis. In this reaction, the supporting electrolyte including sodium halide NaX (X = Cl or Br) was essential since the reaction proceeded through substitution by a halonium ion, generated electrochemically at anode, on active methine carbons followed by base-catalyzed deacetylation, and was terminated by reductlve dehalogenation of the formed α-halo carbonyl compounds at cathode.
Conformational Order of the Alkyl Chain in a Nonionic Surfactant α-Dodecyl-ω-hydroxytris(oxyethylene) (C12E3) in Water
Authors: Masatoki Sei , Ohno Keiichi , Yoshida Hiroshi , Matsuura Hiroatsu
Published: March 2006

The conformational order of the alkyl chain in α-dodecyl-ω-hydroxytris(oxyethylene) (C12E3) has been studied by monodeuteration infrared spectroscopy for the lamellar and the isotropic solution phases of the (C12E3)-water system. The conformational order profiles for the two phases are essentially the same, showing maximum order in the middle of the chain.
A Theoretical Study on the Generation Process of Carbonyl Selenide in Selenium Catalyzed Carbonylation of Amines
Authors: Souza Wladmir Ferraz de , Kambe Nobuaki , Sonoda Noboru
Published: March 2006

Ab initio molecular orbital calculations were performed in order to examine the regeneration pathways of carbonyl selenide which plays an important role in selenium catalyzed carbonylation of amines with carbon monoxide.
Synthesis and Characterization of Hepta[5][5]circulene as a Subunit of C70 Fullerene
Authors: Matsuda Masanori , Matsubara Hiroshi , Sato Masaaki , Okamoto Susumu , Yamamoto Koji
Published: March 2006

The polycyclic aromatic compound with a S-shaped circular arrangement of seven benzene rings, hepta[5][5]circulene 11, was prepared by FVP of bis(1-chlorovinyl)acenaphthofluoranthene 9. The structure and electrochemical properties were also reported.
Cyclodextrin Addition Effect on Radiation-induced Decomposition of Chlorophenols in Deoxygenated Water
Authors: Huang Xixian , Arai Hidehiko , Matsuhasi Shinpei , Miyata Teijiro
Published: March 2006

Radiation induced decomposition of chlorophenols in the presence of cyclodextrins (CDs) was studied. CD addition retarded the decomposition and dechlorination of chlorophenols. The effects remarkably depended on the cavity size of CDs and on the molecular shape of chlorophenols.
Retention of Optical Purity in H-D Exchange Reactions Catalysed by Cobalt-Aluminium Alloy in Na2CO3-D2O
Authors: Mukumoto Mamoru , Tsuzuki Hirohisa , Mataka Shuntaro , Tashiro Masashi , Tsukinoki Takehito , Nagano Yoshiaki
Published: March 2006

Co-Al alloy in a sodium carbonate-deuterium oxide solution catalyzes the H-D exchange reaction of optically active benzylic hydrogen atom without racemization.
Pattern Coloring of UV-Light Imaged Polysilane Films Using Electrochemical Deposition of Pigment Micelle
Authors: Sakurai Yoshiaki , Tachibana Yasuhiro , Koura Takashi , Yokoyama Masaaki
Published: March 2006

The patterned deposition of pigments in a UV-light imaged polysilane film coated on an indium tin oxide glass electrode was successfully performed utilizing photo-induced swelling effect of polysilane and the electrochemical deposition technique of pigment micelles. The result enables us to fabricate the multicolor patterns on the same film with successive electrochemical depositions of different colored pigment micelles, simply repeating the procedures of UV-pattern exposure, electrochemical pigment deposition, washing with water, and drying.
Preparations and Spin-spin Interactions of 4,4′-(Triptycene-1,8-diyl)bis(1-methyl-2,6-diphenylpyridinyl) Diradical and Its 1,5-Diyl Isomer
Authors: Okada Keiji , Ueda Kazumasa , Oda Masaji , Murai Hisao , Akiyama Kimio , Ikegami Yusaku
Published: March 2006

4,4′-(Triptycene-1,8-diyl)bis(1-methyl-2,6-diphenylpyridinyl)diradical was prepared by 3%-Na-Hg reduction of the corresponding dication and the ground state was estimated to be triplet or singlet with small S-T energy gap (< 20 J mol−1). No triplet signal was observed under the similar conditions for the corresponding 1,5-diyl derivative.
Design, Synthesis, and Electrochemical Behavior of New Electron Donors Based on β-Effects of Group 14 Elements in Electron Transfer
Authors: Nishiwaki Keiji , Yoshida Jun-ichi
Published: March 2006

In a program aimed at new electron donors, we synthesized several silicon- and tin-substituted 1,3-benzodithioles which exhibited much lower oxidation potentials than 1,3-benzodithiole. This effect was supported by the molecular orbital calculations.
Solvent Extraction of Silver(I) and Palladium(II) Ions with Ketone Derivative of Calix[4]arene from Highly Acidic Nitrate Media
Authors: Ohto Keisuke , Murakami Emi , Shiratsuchi Koji , Inoue Katsutoshi , Iwasaki Mineto
Published: March 2006

The solvent extraction of silver (I) and palladium (II) ions with 25,26,27,28-tetrakis(acetomethoxy)-5,11,17,23-tetrakis(1,1,3,3-tetramethylbutyl)calix[4]arene (1) in chloroform from nitric acid solution was investigated. The compound 1 was capable of highly selectively extracting silver over palladium from about 1 mol dm−3 nitric acid solution and was effective in removing trace amounts of silver from a large excess of palladium. The coordination site of silver ion on 1 was also determined from the chemical shift in the 1H-NMR spectra.
Preparation and Characterization of Heteronuclear Hexacyano Complexes, LnxSm1−x[Co(CN)6]·nH2O (Ln = La, Er, and Yb)
Authors: Sadaoka Yoshihiko , Traversa Enrico , Sakamoto Masatomi
Published: March 2006

Heteronuclear hexacyano complexes LnxSm1−x[Co(CN)6]·nH2O (Ln = La, Er, and Yb) were synthesized. In the orthorhombic series, the lattice parameters increase linearly with the effective radii of rare earth ions (reff = x rLn + (1−x)rSm), a parameter which is here introduced.
An Investigation of the Template Effects in the Synthesis of Monobenzo-15-Crown-5 Ether by Molecular Dynamics Simulation
Authors: Oh Weon Seok , Kwon Myung Hee , Kim Su Yeon , No Kyoung Tai , Chang Suk-Kyu
Published: March 2006

The molecular dynamics simulations of the template effects of alkali metal cations for the synthesis of monobenzo-15-crown-5 were performed. The simulation results qualitatively duplicate the experimental results and Na+ ion was found to be the best template ion among alkali metal cations.
Synthesis and Properties of Pentahomothiazacalix[3]arene Derivatives Constructed from Phenol-Formaldehyde Trimer and Aminoethanethiol Unit
Authors: Ito Kazuaki , Ohba Yoshihiro , Sone Tyo
Published: March 2006

Chiral calixarene analogs incorporating aminoethanethiol unit such as l-cysteine alkyl ester into their rings were prepared. NMR studies of the macrocycles reveal that their preferred conformations in solution are a cone form and the introduction of aminoethanethiol unit in their rings causes the ring fluctuation.
Regio- and Stereoselective Incorporation of a 13C Nuclide into d-ribo-Phytosphingosine via SmI2-Mediated C–C Formation with 13C-Labeled Isocyanide
Authors: Murakami Masahiro , Ito Hajime , lto Yoshihiko
Published: March 2006

Preparation of a 13C-labeled isocyanide and its application to the total synthesis of [2-13C]d-ribo-C18-phytosphingosine are described. The synthesis of the labeled phytosphingosine is based on the use of the isocyanide as a 13CH–NH2 precursor in the SmI2-mediated three-component coupling reaction, wherein regio- and stereoselective incorporation of a 13C nuclide in the carbon skeleton is achieved.
Artificial Membrane Protein Functionalized with Electron Transfer System
Authors: Mihara Hisakazu , Tomizaki Kin-ya , Fujimoto Tsutomu , Sakamoto Seiji , Aoyagi Haruhiko , Nishino Norikazu
Published: March 2006

An artificial membrane protein bearing a flavin and a porphyrin functionalities was designed and synthesized. The protein took a 4α-helix structure and exhibited an electron transfer function in a bilayer membrane.
Electroabsorption of Amphiphilic Tetrathiafulvalene Derivatives / 7,7,8,8-Tetracyano-2,3,5,6-tetrafluoroquinodimethane Systems in Langmuir-Blodgett Films
Authors: Nakamura Tohru , Azumi Reiko , Tachibana Hiroaki , Matsumoto Mutsuyoshi
Published: March 2006

External electric field effects on the electronic structures of charge transfer salts were examined for the first time in Langmuir-Blodgett films. Significant electroabsorption signals arising primarily from the first Stark effect were obtained for the films of amphiphilic tetrathiafulvalene derivatives / 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane 1 : 1 salts.
Reaction of 5-Phenyl-3H-1,2-dithiol-3-one and Thione with [Rh(Cp*)(CO)2]. Formation of Metalladithiolene Rings via Rearrangement
Authors: Nozawa Shouhei , Sugiyama Toru , Kajitani Masatsugu , Akiyama Takeo , Sugimori Akira
Published: March 2006

The reaction of [Rh(Cp*)(CO)2] (1) with 5-phenyl-3H-1,2-dithiol-3-one (2) affords two rhodiadithiolene complexes, a dimer of (η5-pentamethylcyclopentadienyl)(1-oxo-2-benzylidene-1,2-ethanedithiolato)rhodium(III) (4) and (η5-pentamethyl cyclopentadienyl)(1-phenyl-1,2-ethenedithiolato)rhodium(III) (5). 5-Phenyl-3H-1,2-dithiole-3-thione (3) reacts with 1 to afford only 5. The formation of the complexes 4 and 5 is explained by a mechanism via the attack of coordinatively unsaturated “Rh(Cp*)(CO)” species to the S atom of 2, followed by rearrangement.
Asymmetric Base-Catalyzed Diels-Alder Reaction of 3-Hydroxy-2-Pyrone with N-Methylmaleimide
Authors: Okamura Hiroaki , Nakamura Yasuko , Iwagawa Tetsuo , Nakatani Munehiro
Published: March 2006

An asymmetric base-catalyzed Diels-Alder reaction of 3-hydroxy-2-pyrone with N-methylmaleimide was achieved by using cinchona alkaloids as asymmetric catalysts. The reaction catalyzed by cinchonidine afforded endo-adduct in 77% ee, and opposite enantiomer of 71% ee was obtained with cinchonine.
Enhanced Dissolution of SO2 into Dewwater by Forming Hydroxyalkanesulfonate
Authors: Katagiri Yasuyuki , Sawaki Natsuji , Arai Yukiko , Okochi Hiroshi , Igawa Manabu
Published: March 2006

Hydroxymethanesulfonate ion (HMSA) is an important species in dewwater and the formation of HMSA enhances the dissolution of SO2. The HMSA stability constant calculated from the measured concentrations of free formaldehyde and S(IV) in dewwater agreed in the order with the reported value, which suggested the formation of HMSA and other S(IV) complexes.
Determination of Aluminium in Human Serum by Kinetic Differentiation Mode Reversed Phase Micellar HPLC with Fluorometric Detection
Authors: Sato Makoto , Yoshimura Hajime , Obi Hideki , Hatakeyama Shin-ichi , Kaneko Emiko , Hoshino Hitoshi , Yotsuyanagi Takao
Published: March 2006

A highly sensitive and selective fluorometric method for aluminium in humn serum with 8-quinolinol has been developed by the use of kinetic differentiation mode micellar high performance liquid chromatography. The most remarkable point of this method is that only aluminium ion responses to this detection system, as well as no deproteinization is required prior to analysis. The detection limit, 3SD, was 1 ppb for aluminium.
Secretion of Allelochemicals from the Cultured Suspension Cells of Marchantia polymorpha
Authors: Chen Li , Izumi Shunsuke , Ito Diana I , Iwaeda Tomoko , Utsumi Ryoichi , Hirata Toshifumi
Published: March 2006

4[2-(3-Hydroxyphenyl)ethyl]phenol and 4-hydroxy-2,3-dimethyl-2-nonen-4-olide were isolated from the medium of Marchantia polymorpha cell cultures as allelopathic substances.
Vertical Sectioning of Molecular Assemblies at Air/Water Interface Using Laser Scanning Confocal Fluorescence Microscopy
Authors: Glück Guiscard , Ringsdorf Helmut , Okumura Yukihisa , Sunamoto Junzo
Published: March 2006

Laser scanning confocal microscopy was applied to collect vertical fluorescence intensity profiles of fluorescent supramolecular assemblies at the air/water interface. For monolayers, fluorescence was collected in the range of a couple of tens of micrometers according to the theoretical thickness of optical section. This technique provides an in situ possibility to monitor supramolecular assemblies and assembling at the air/water interface even without resolving in molecular dimensions.
Synthesis, Stereochemistry, and Thermolysis of β-Aminoalkylboranes
Authors: Kawashima Takayuki , Yamashita Naoko , Okazaki Renji
Published: March 2006

erythro- and threo-β-Amino boranes Mes2BCHMeCHPhNHPh were synthesized by the reaction of Mes2BCHMeLi with N-benzylideneaniline. The stereochemistry was determined by chemical derivation into the corresponding cycic carbanates via β-amino alcohols. Their thermolysis gave a mixture of the corresponding (E)-enamine and its tautomer, (E)-imine, in sharp contrast to that of β-hydroxy boranes giving the olefins.