bluuebunny/crossref_metadata_2025 huggingface dataset:
Through-Bond Interaction in the Trifluoroethanolysis of 4-Oxo-2eq-adamantyl Triflate and Its Essential Vanishing in the Corresponding 2-Phenyl Substituted Trifluoroacetate
Authors: Yoshida Masayasu , Mitsuhashi Koichi , Kimura Tsutomu , Takeuchi Ken’ichi , Fukuyo Emiko , Yanagi Kazunori
Published: May 2006

Attachment of an oxo substituent on the 4-position of 2-adamantyl triflate alters the rate of trifluoroethanolysis at 25 °C by respective factors of 10−1.1 and 10−2.5 for 2eq- and 2ax-triflates, and 10−2.9 and 10−2.5 for the corresponding 2-phenyl-2eq- and -2ax-adamantyl trifluoroacetates, indicating the presence of through-bond interaction in the secondary equatorial and its essential vanishing in the 2-phenyl system. Product distributions agree with this notion.
Dependence of the Lewis Acid-induced Reaction of β-Stannyl Ketones upon Substitution Pattern. 1,2-Alkyl Migration versus Cyclopropanation
Authors: Fujiwara Jun , Yamamoto Taro , Sato Tadashi
Published: May 2006

3-Stannylcyclohexanones fully substituted at 2 and 3 positions undergo a 1,2-alkyl migration and cyclopropanation. The balance of the reaction pattern depends upon the steric environment and migratory aptitude of the alkyl groups.
Heterocyclic Betaines. Imidazolium Benzimidazolate Inner Salts with a Vinylene and Oxoethylene Interannular Linkages
Authors: Alcalde Ermitas , Pérez-Garcia Lluïsa , Pons Josep M , Roca Tomás
Published: May 2006

A novel ensemble of heterocyclic betaines is reported. The title compounds were synthesized by two methodologies according to the nature of the interannular linkage. Their highly dipolar structure is well shown by their physicochemical properties.
NMR Study on Compositional Inhomogeneity in Electroless-Deposited CoNiP Films for Perpendicular Magnetic Recording
Authors: Homma Takayuki , Asai Hiroki , Osaka Tetsuya , Takei Koji , Maeda Yasushi
Published: May 2006

Compositional inhomogeneity in electroless-deposited CoNiP films with perpendicular magnetic anisotropy was examined using the spin echo 59Co-NMR technique for the first time. The existence of a Co-rich component was observed which was thought to cause the formation of an hcp structure and produce high perpendicular coercivity, Hc(⊥). An increment in the Co-rich component by heat-treatment was also observed which might be an origin of the increase in Hc(⊥).
Electroactivity Change of Electropolymerized Polypyrrole/Polystyrenesulfonate Composite Film in Some Organic Electrolytes
Authors: Osaka Tetsuya , Momma Toshiyuki , Nishimura Ken
Published: May 2006

Electroactivity of polypyrrole/polystyrenesulfonate composite film obtained from an aqueous solution was examined in various organic electrolytes. The composite film worked like electroinactive film in electrolyte using propylene carbonate or some solvents except in the case of DMF or DMSO electrolytes, however, the film changed from electroinactive to electroactive even in propylene carbonate and some organic electrolytes after an electrochemical potential application to the film while in DMF or DMSO electrolytes.
Glucose Sensitivity of Poly(mercapto-p-benzoquinone) Films Containing Immobilized Glucose Oxidase
Authors: Arai Gorou , Masuda Miwako , Yasumori Iwao
Published: May 2006

Glucose oxidase was immobilized in poly(mercapto-p-benzoquinone) film by an electropolymerization of mercaptohydroquinone in the presence of the enzyme. The resulting polymer-coated electrode functioned well as a glucose sensor in an N2 atmosphere. The sensor showed excellent selectivity for glucose and was possessed of good durability.
Preparation and Structural Characterization of Cationic Dinuclear Ruthenium(II) — Thiolate Complexes, [Ru2(SPh)3(η6-p-cymene)2]Y (Y = Cl and PF6)
Authors: Mashima Kazushi , Mikami Aki , Nakamura Akira
Published: May 2006

Treatment of [RuCl2(p-cymene)]2 with sodium benzenethiolate in methanol afforded a cationic dinuclear ruthenium thiolate complexes, [Ru2(SPh)3(p-cymene)2]Y (2a: Y = Cl; 2b: Y = PF6), whose structure is determined by X-ray analysis of 2b.
Copper-Ion Responsive Chemical Bimetal
Authors: Yamada Takeshi
Published: May 2006

A new type of sensor, called “Chemical Bimetal”, has been developed. Chemical Bimetal uses the “Bimetal effect” and can effectively amplify the expansion or the contraction of materials. The copper-ion responsive Chemical Bimetal was constructed from polyethylene terephthalate (PET) membrane and polyvinyl chloride (PVC) membrane which contains 7-(1-ethenyl-3,3,5,5-tetramethylhexyl)-8-quinolinol (Kelex 100) as a reactant. This Chemical Bimetal responds to copper ion concentration from 0.2 to 1 mM.
Unusual Diastereofacial Selectivity in the Michael Addition Reactions of Lithiated 2-Aminoacetates and -acetamides to α,β-Unsaturated Carbonyl Compounds
Authors: Kanemasa Shuji , Nomura Masafumi , Taguchi Yasuhisa
Published: May 2006

Unusual diastereofacial selectivities are observed in the Michael addition reactions of lithiated aminoacetates and -acetamides to α,β-unsaturated carbonyl acceptors. Lithiated (methylamino)acetates and -acetamides show opposite anti- and syn-selectivities, respectively, while lithiated (dialkylamino)acetates and -acetamides are both highly syn-selective.
A Hybrid of Amphiphilic α-Helical Peptides and meso-Tetra(α,α,α,α-o-carboxyphenyl)porphyrin. Membrane-Penetrating Porphyrin-4α-Helix Artificial Protein
Authors: Mihara Hisakazu , Nishino Norikazu , Hasegawa Ryuji , Fujimoto Tsutomu
Published: May 2006

Four amphiphilic α-helical peptides were hybridized with α,α,α,α-isomer of meso-tetra(o-carboxyphenyl)porphyrin to synthesize a picket-fence-type 4α-helix bundle polypeptide. The peptide sequence was designed so that the hybrid polypeptide could penetrate into phospholipid bilayers. Circular dichroism spectra showed that the hybrid folds in a complete four α-helix bundle structure both in methanol and dipalmitoylphosphatidylcholine vesicles.
Probing Behavior of 1-Pyrenylalanine for Interaction of Two α-Helices Anchored on a Bipyridyl Group
Authors: Mihara Hisakazu , Nishino Norikazu , Fujimoto Tsutomu
Published: May 2006

Two strands of an amphiphilic α-helical 14-peptide were anchored in parallel on a bipyridyl group to construct a helix-helix structure. The interaction of two α-helices in various circumstances was probed by behavior of 1-pyrenylalanine residues in circular dichroism and fluorescence spectra.
Design of a Hybrid of Two α-Helix Peptides and Ruthenium Trisbipyridine Complex for Photo-induced Electron Transfer System in Bilayer Membrane
Authors: Mihara Hisakazu , Nishino Norikazu , Hasegawa Ryuji , Fujimoto Tsutomu , Usui Satoshi , Ishida Hitoshi , Ohkubo Katsutoshi
Published: May 2006

Two strands of an amphiphilic α-helical 22-peptide were anchored on ruthenium trisbipyridine complex. The hybrid was equipped with the triad of the ruthenium complex, anthraquinone, and viologen as photo-induced electron transfer system embedded in bilayer membrane.
Remarkable Effect of D-Sorbitol on the Second Stage in the PLE-Catalyzed Hydrolyses of a σ-Symmetric Diester, cis-Cyclohex-4-ene-1,2-bis(methyl acetate)
Authors: Nagao Yoshimitsu , Tohjo Toshiaki , Kaneuchi Tohru , Yukimoto Yusuke , Kume Masaharu
Published: May 2006

Enantioselective hydrolysis of cis-cyclohex-4-ene-1,2-bis(methyl acetate) with porcine liver esterase (PLE) in the presence of D-sorbitol afforded a chiral monoester in a highly enantioselective manner. During the enzymatic hydrolyses, D-sorbitol efficiently accelerate the second stage; hydrolysis of the resultant minor monoester toward the dicarboxylic acid leaving the desired major monoester.
A Simple Synthesis of Pure 2-Aminotroponimine, the Nitrogen Analogue of Tropolone
Authors: Machiguchi Takahisa , Takeno Tetsumi , Hasegawa Toshio , Kimura Yoshiyasu
Published: May 2006

2-Aminotroponimine (1) is conveniently synthesized in high yield and is isolated in pure form, starting from 2-aminotropone via 2-methoxytroponiminium fluorosulfonate. N,N′-Dimethyl derivative of 1 is prepared similarly.
Novel Bis(triphenylphosphine)platinum(II) Complexes Containing a Thiourea or a 1,3-Diethylthiourea Dianion as an N,S-Chelating Ligand
Authors: Okeya Seichi , Fujiwara Yasuko , Kawashima Setsuko , Hayashi Yoshihito , Isobe Kiyoshi , Nakamura Yukio , Shimomura Hiroshi , Kushi Yoshihiko
Published: May 2006

Three kinds of platinum(II) complexes, [Pt{S=C(NHEt)2}2h(PPh3)2](hfac)2, (2; R = Et or H, X = hfac) and (R = Et (3a) or H), containing thiourea derivatives as neutral, monoanionic, and dianionic ligands, respectively, have been prepared. Thioureido(1−) complex 2 (R = Et, X = OTs) was also prepared by protonation of 3a with TsOH·H2O. The structure of 3a with an N,S-chelating thioureido(2−) ligand was determined by single-crystal X-Ray diffraction.
Strong Dichroism of π-Conjugated Poly(2,2′-bipyridine-5,5′-diyl) and Poly(pyridine-5,2-diylthiophene-2,5-diyl) in Stretched Poly(vinyl alcohol) Film
Authors: Maruyama Tsukasa , Kubota Kenji , Yamamoto Takakazu
Published: May 2006

Stretching of poly(vinyl alcohol) PVA film containing poly(2,2′-bipyridine-5,5′-diyl) PBPy or poly(pyridine-5,2-diyl-thiophene-2,5-diyl)PTPy in the surface region of PVA leads to alignment of the π-conjugated polymers along the stretching direction. The stretched PVA-PBPy and PVA-PTPy aduct films showed a strong dichroism and polarizing effect at 350 nm and 450 nm, respectively.
Preparation and Isolation of an Exceptionally Persistent Nitrogen-centered Free Radical. N-[(4-Nitrophenyl)thio]-2.7-di-t-butyl-1-pyrenylaminyl
Authors: Miura Yozo , Yamano Eiji , Tanaka Akio , Ogo Yoshiaki
Published: May 2006

Oxidation of N-[(4-nitrophenyl)thio]-2,7-di-t-butyl-1-aminopyrene yields an exceptionally persistent and oxygen-insensitive N-[(4-nitrophenyl)thio]-2,7-di-t-butyl-1-pyrenylaminyl, which has been isolated as pure radical crystals in 31% yield. The crystals can be stored, without decomposition, for a long period.
A Controlled Synthesis of 9α-Methyl- and 9α-Cyanoisocarbacyclins
Authors: Hashimoto Shun-ichi , Suzuki Atsushi , Shinoda Tomohiro , Miyazaki Yoji , Ikegami Shiro
Published: May 2006

A controlled synthesis of 9α-methyl- and 9α-cyanoisocarbacyclins from the keto-diol, a key intermediate in the convergent synthesis of isocarbacyclin, has been accomplished by exploiting the sequence of a one-pot construction of the regio-defined enol triflate via 1,4-hydrosilylation of the enone and Pd(0)-catalyzed cross-coupling.
Cooperative Binding of Adenine via Complementary Hydrogen Bonding to an Imide Functionalized Monolayer at the Air-Water Interface
Authors: Kawahara Takaharu , Kurihara Kazue , Kunitake Toyoki
Published: May 2006

Double-chain derivatives of orotic acid (1) and hydroorotic acid (2) formed stable monolayers at the air-water interface. FT-IR and ESCA spectroscopies revealed specific cooperative binding of adenine from the aqueous subphase to monolayer 1 in preference to thymine. Monolayer 2 did not bind these nucleic acid bases.
An Efficient Synthesis of Selenocarbonyl Compounds by the Treatment of Carbonyl Compounds with Bis[1,5-cyclooctanediylboryl] Selenide
Authors: Shimada Kazuaki , Jin Norikazu , Fujimura Manabu , Nagano Yumi , Kudoh Eiichi , Takikawa Yuji
Published: May 2006

An efficient synthesis of selenoaldehydes, selenoketones, and selenoamides was achieved by the treatment of carbonyl compounds with bis[1,5-cyclooctanediylboryl] selenide.
Difference between Chlorophylls a and a′ in the Intermolecular Association Behavior. Visible Absorption and Circular Dichroism Spectral Features in Aqueous Methanol
Authors: Watanabe Tadashi , Kobayashi Masami , Hongu Akinori , Oba Toru
Published: May 2006

Visible absorption and circular dichroism (CD) spectroscopies on a series of chlorophyll (Chl) a/a′ epimeric mixtures in aqueous methanol have unraveled a striking influence of the stereochemistry at carbon 132 on the mode of intermolecular association of these pigments.
Synthesis of Asperuloside Aglucon Silyl Ether and Garjasmine from (+)-Genipin via Gardenoside Aglucon Disilyl Ether as a Common Intermediate
Authors: Nakatani Kazuhiko , Hiraishi Atsushi , Han Qingjun , Isoe Sachihiko
Published: May 2006

Synthesis of asperuloside aglucon silyl ether (4) and garjasmine from (+)-genipin was accomplished by utilizing the gardenoside aglucon disilyl ether (3) as a common intermediate. During the transformation of 3 into 4 the acid catalyzed transposition reaction of hydroxy group was found to proceed from more hindered concave side.
Mechanical and Optical Anisotropies of Nematic and Cholesteric Hydrogels of Poly(L-glutamic acid)
Authors: Matsuoka Yoshiki , Kishi Ryoichi , Sisido Masahiko
Published: May 2006

Cross-linked gels of poly(L-glutamic acid) (PGA) possessing cholesteric or nematic liquid-crystalline (LC) order were prepared from the corresponding LC gels of poly(γ-benzyl L-glutamate). Optical anisotropy measured by transmitted light intensity through cholesteric LC hydrogels between crossed polarizers showed reversible changes with the alternation of pH values. Mechanical anisotropy was also found in the nematic LC hydrogels.
Anaerobic Biodegradability of Water-Soluble High Molecular Weight Polycarboxylate by River Sediments
Authors: Matsumura Shuichi , Shimokobe Hisaki
Published: May 2006

High molecular weight poly(sodium carboxylate)s designed as biodegradable functional polymers were confirmed to be biodegraded under anaerobic conditions using river sediment. They were biodegraded to an extent similar to that under aerobic conditions.
Scillasaponins A, B, and C, New Triterpenoid Oligosaccharides from the Plants of the Subfamily Scilloideae
Authors: Mimaki Yoshihiro , Ori Kazutomo , Kubo Satoshi , Sashida Yutaka , Nikaido Tamotsu , Song Lian-Gang , Ohmoto Taichi
Published: May 2006

Three new triterpenoid oligosaccharides, scillasaponins A, B, and C, were isolated from the fresh bulbs of Eucomis bicolor, Scilla peruviana, and Chionodoxa gigantea, respectively. Their structures were established by extensive NMR studies. Scillasaponins were active as a cyclic AMP phosphodiesterase inhibitor.
Alkylation of Acetaldehyde with Methanol over Titanium Oxide-supported Vanadium Oxide
Authors: Wang Fey-long , Lin Yi-hsuan
Published: May 2006

Among various titanium oxide-supported vanadium oxides (V/TiO2), V(2.5 wt%)/TiO2 showed the highest catalytic activity at 350 °C in the reaction of methanol and acetaldehyde, selectively yielding propionaldehyde and isobutyraldehyde. Total alkylated products selectivity attained 83% at 76% acetaldehyde conversion.
Synthesis and Crystal Structure of Molybdenum-Trisubstituted Tungstophosphate Anion Salt, A-β-[N(CH3)4]3[PMo3W9O40]
Authors: Kawafune Isao , Matsubayashi Gen-etsu
Published: May 2006

The molybdenum-trisubstituted tungstophosphate anion, [PMo3W9O40]3−, was synthesized by a reaction of Na2MoO4 and A-Na9[PW9O34] in an HCl and 1,4-dioxane mixed solution. X-ray crystal structure analysis of the tetramethylammonium salt of the mixed addenda polyanion revealed the anion geometry as an A-type trisubstituted, β-isomer.
Synthesis of Tetrathiafulvalene Derivatives by the Use of Organoaluminium Reagents
Authors: Mori Takehiko , Inokuchi Hiroo
Published: May 2006

Bis(dimethylaluminium) salts of ethanedithiol, 1,2-benzenedithiol, and ethylenedithiol react with 1,3-dithiolane-2-carboxylate esters to give dihydro- and tetrahydro-tetrathiafulvalenes as well as tetrathiafulvalene derivatives.
Inhibition of Intervesicular Aggregation of Phospholipid Vesicles by Incorporation of Dialkyl Oligosaccharide Glycerol
Authors: Takeoka Shinji , Sakai Hiromi , Takisada Mikimasa , Tsuchida Eishun
Published: May 2006

1,2-Di-O-octadecyl-3-O-α(β)-maltopentaosyl-rac-glycerol (DOMPG) was incorporated into lipid vesicles to modify the surface of the vesicles. The aggregation of small unilamellar vesicles below the gel-to-liquid crystalline phase transition temperature and the aggregation of negatively-charged vesicles by the addition of calcium ion were effectively inhibited.
Structures of Sideroxylonals from Eucalyptus sideroxylon
Authors: Satoh Hirofumi , Etoh Hideo , Watanabe Naoharu , Kawagishi Hirokazu , Arai Koshi , Ina Kazuo
Published: May 2006

The structures of two novel isopentyl phloroglucinol dimers, designated as sideroxylonals A and B were deduced on the basis of proton magnetic resonance, 13C-nuclear magnetic resonance and mass spectral evidences.
Definitive Evidence for Enantioselective Catalysis over “Molecular Footprint” Catalytic Cavities Chirally Imprinted on a Silica(Alumina) Gel Surface
Authors: Matsuishi Tamae , Shimada Toyoshi , Morihara Kensaku
Published: May 2006

“Molecular footprint”-like catalytic cavities were marked on a silica(alumina) gel surface by the authors’ molecular imprinting method using a chiral mandelic acid derivative ((−)-(5R)-5-phenyl-2,4-diketo-tetrahydro-oxazole); these chirally imprinted cavities displayed distinct enantioselective catalysis on the transacylation of the corresponding substrates, N-carboxy-(R)-phenylglycine anhydrides and the (S)-isomer.
Preparation of Organosol of Noble Metal Clusters with Novel Method
Authors: Toshima Naoki , Liu Hanfan
Published: May 2006

The organosols of noble metal clusters such as monometallic Pt, Pd, and Rh clusters, and bimetallic Au/Pd, Pd/Pt, and Pt/Rh clusters in organic media like butanol were prepared by reversible transfer of the cluster particles from an aqueous phase to the organic phase by using a coordination capture technique with triphenylphosphosphine. The electronic spectra and transmission electron micrographs of the dispersed clusters before and after the transfer indicate that no change occurs in size and size distribution during the transfer.
Alkoxo-Bridged Trinuclear Manganese(III) Complex with an Isosceles Triangle Core
Authors: Mikuriya Masahiro , Majima Koji , Yamato Yo
Published: May 2006

An alkoxo-bridged trinuclear manganese(III) complex with an isosceles triangle core, [Mn3(L)2(CH3O)2(CH3OH)(C2H5OH)](ClO4)·CH3OH (H3L = bis(benzoylacetone)-1,3-diiminopropan-2-ol), has been prepared and characterized by X-ray structure analyses, electronic spectra and magnetic susceptibilities (80–300 K).
Oxidation of Amines with CuBr2-LiOBut
Authors: Yamaguchi Jun-ichi , Takeda Takeshi
Published: May 2006

The oxidation of secondary amines with copper(II) reagent, prepared from copper(II) bromide and lithium t-butoxide, under mild reaction conditions gave the corresponding imines in high yields. Primary amines were also transformed to the corresponding nitriles.
Molecular Recognition of Butylamines by Calixarene-Based Ester Ligands
Authors: Chang Suk-Kyu , Jang MyungJong , Han Sang Yoon , Lee Joo Hyung , Kang Myung Hee , No Kyoung Tai
Published: May 2006

Ester derivatives of p-tert-butylcalix[6]arene exhibited unique molecular recognition properties toward butylamines. Binding selectivity of hexaethyl ester, assessed by the extraction of butylammonium picrates, was found to be superior to dibenzo-18-crown-6 ether.
pH Effect on the Preparation by Sol-Gel Method of ZrO2/SiO2 Catalysts
Authors: Lopez Tessy , Gomez Ricardo , Ferrat Gerardo , Dominguez Jose M , Schifter Isaac
Published: May 2006

pH effect on the preparation of ZrO2/SiO2 catalysts by sol-gel method was studied. Basic and acidic media were used during the gelation of tetraethoxysilane (TEOS) and zirconium acetate. In acid medium the catalysts showed high acidity and high specific surface area up to 805 m2/g, whereas in the basic preparations the opposite effect was observed.
Bismuth(III)chloride as a New Catalyst for Knoevenagel Condensation in the Absence of Solvent
Authors: Prajapati Dipak , Sandhu Jagir S
Published: May 2006

The Knoevenagel condensation of various aldehydes was carried out under heterogenous catalysts conditions using bismuth(III)chloride in absence of solvent. The method gives high yields of Knoevenagel products.
Copper(I) Salt Promoted Reactions of Sulfur Nucleophiles with Vinyl Bromides. Simple and Straightforward Preparations of S-Vinyl Thiobenzoates and S,S′-Vinylidene Bisthiobenzoates
Authors: Ogawa Takuji , Hotta Shunsuke , Hayami Kazuo , Suzuki Hitomi
Published: May 2006

Copper(I) salt promoted reaction of vinyl bromides with dibenzoyl disulfide in hot aprotic polar solvent produced thiophene derivatives in moderate yields, while the corresponding reaction with sodium thiobenzoate led to S-vinyl thiobenzoates in good yields.
Heterogeneous Photocatalysis of Poly(4-trifluoromethylpyridine-2,6-diyl)
Authors: Maruo Katsuya , Yasuda Naoki , Wada Yuji , Yanagida Shozo
Published: May 2006

Poly(4-trifluoromethylpyridine-2,6-diyl) shows heterogeneous photocatalysis under visible light (λ > 400 nm), leading to efficient reductions not only of water to H2 but also of some carbonyl compounds to alcohols in the presence of triethylamine as a sacrificial electron donor.
Reduction of Carbon Dioxide by Methane with Ni-on-MgO-CaO Containing Catalysts
Authors: Yamazaki Osamu , Nozaki Takao , Omata Kohji , Fujimoto Kaoru
Published: May 2006

It was found that Ni-on-MgO-CaO containing catalyst showed excellent activity and stability for reducing CO2 by CH4 to make syngas. Especially higher CaO containing catalyst showed more excellent stability even under conditions such as, 850 °C, 0.32 MPa and CO2/CH4 = 1/1 (mole ratio).
Active Crystal Face of Vanadyl Pyrophosphate for Catalytic Oxidation of n-Butane to Maleic Anhydride
Authors: Inumaru Kei , Okuhara Toshio , Misono Makoto
Published: May 2006

(VO)2P2O7 consisting of thin planar crystallites, which was selective for the butane oxidation, was first deactivated by the deposition of SiO2 thin layer, and then fractured to create new side faces like (001) and (021). The side faces were non-selective for the reaction, indicating that (100) face, on which V4+(=O)–O–V4+ sites are located, is selective.
Enantiomer Separation with Cellulose Tris(3,5-dimethylphenylcarbamate) Membrane. Enantioselective Adsorption and Desorption
Authors: Yashima Eiji , Noguchi Junko , Okamoto Yoshio
Published: May 2006

The enantioselective adsorption of some racemic compounds was investigated on cellulose tris(3,5-dimethylphenylcarbamate) membrane supported on a Teflon membrane filter. The highly enantioselective adsorption was observed for β-blockers such as oxprenolol. The enantiomeric excess of adsorbed oxprenolol reached up to 60%. The enantioselective desorption on the membrane was also studied.
Effects of Pressure and Ethanol on the Phase Behavior of Dipalmitoylphosphatidylcholine Multilamellar Vesicles
Authors: Kaneshina Shoji , Tamura Katsuhiro , Kawakami Hitoshi , Matsuki Hitoshi
Published: May 2006

The temperature-pressure phase diagrams of dipalmitoylphosphatidylcholine multilamellar vesicles were constructed in the presence of ethanol. Pressure- and/or ethanol-induced gel phase was observed. Pressure facilitates, rather than antagonizes, the effect of ethanol on the occurrence of interdigitated gel phase in lipid bilayers.
Isolation of a Unique Hexanuclear [Bi6O4OH(cit)3(H2O)3]3− Cluster from the Bismuth-Containing Ulcer Healing Agent “Colloidal Bismuth Subcitrate (CBS)”
Authors: Asato Eiji , Katsura Kosho , Mikuriya Masahiro , Fujii Toshinori , Reedijk Jan
Published: May 2006

An active ingredient of peptic ulcer healing agent “Colloidal Bismuth Subcitrate (CBS)” has been isolated by crystallization from a solution containing bismuth citrate and ammonia. The single-crystal X-ray structure analysis has demonstrated that it consists of unique anionic hexanuclear bismuth oxo-hydroxo-citrato clusters connected by ammonium ions and weak citrate bridges.
Synthesis and Properties of Some Sterically Protected 2-(1- and 2-Azulenyl)-1-phosphaethenes
Authors: Yasunami Masafumi , Ueno Tetsuya , Yoshifuji Masaaki , Okamoto Akihiro , Hirotsu Ken
Published: May 2006

Some sterically protected 2-(1-azulenyl)- and 2-(2-azulenyl)-1-(2,4,6-tri-t-butylphenyl)-1-phosphaethenes were prepared from the corresponding silylphosphide and 1- and 2-formylazulenes by the phospha-Peterson reactions. The crystal structure of 2-(6-isopropyl-1-azulenyl)-1-(2,4,6-tri-t-butylphenyl)-1-phosphaethene was determined by the X-ray analysis.
Metal-Complex Ferrimagnets with the Formula {NBu4[M(II)Fe(III)(ox)3]}3∞ (NBu4+ = Tetra(n-butyl)ammonium Ion, ox2− = Oxalate Ion, M = Fe2+, Ni2+)
Authors: Tamaki Hiroko , Mitsumi Minoru , Nakamura Ken-ichi , Matsumoto Naohide , Kida Sigeo , Okawa Hisashi , Iijima Seiichiro
Published: May 2006

Mixed-metal assemblies {NBu4[M(II)Fe(III)(ox)3]}3∞ (M = Ni (1), Fe (2), Mn, Zn) have been prepared and characterized, where NBu4+ = tetra(n-butyl)ammonium ion, ox2− = oxalate ion. Each assumes a three-dimensional network structure consisting of alternately arrayed Fe(III) and M(II) ions. The compounds 1 and 2 are shown to be ferrimagnet with a magnetic phase-transition temperature of 28 and 43 K, respectively.
Photoelectrochemical Deposition of Copper on TiO2 Particles. Generation of Copper Patterns without Photoresists
Authors: Morishita Shinya
Published: May 2006

In the presence of EDTA or 2,2′,2″-nitrilotriethanol, copper was photoelectrochemically deposited on TiO2 particles. Selective deposition of copper on irradiated parts of a TiO2-sol-adhered alumina plate was accomplished in an electroless copper plating solution containing EDTA.
Selective Hydrogenation of Cyclic Ester to α,ω-Diol Catalyzed by Cationic Ruthenium Complexes with Trialkylphosphine Ligands
Authors: Hara Yoshinori , Inagaki Hiroko , Nishimura Sugio , Wada Keisuke
Published: May 2006

Cyclic esters like γ-butyrolactone were smoothly hydrogenated in the presence of a series of ruthenium complexes with trialkylphosphine ligands under mild conditions to afford the correspondig α,ω-diols with high selectivity. The ruthenium complexes prepared in the presence of additional NH4PF6 or H3PO4 turned out to have the superior catalytic activity.
Acidic Alkali Metal Salts and Ammonium Salts of Keggin-type Heteropolyacids as Efficient Solid Acid Catalysts for Liquid-phase Friedel-Crafts Reactions
Authors: Izumi Yusuke , Ogawa Mayumi , Nohara Wataru , Urabe Kazuo
Published: May 2006

Acidic salts of the Keggin-type heteropolytungstic acids prepared through partial neutralization with alkali metal carbonates or ammonium hydroxide had relatively large surface areas, and showed high catalytic efficiency as insoluble solid acid catalysts in Friedel-Crafts alkylation and acylation using benzyl chloride, benzoyl chloride, benzoic anhydride, benzoic acid, acetic anhydride, and acetic acid as electrophiles.
Efficient Preparation of αβαβ-Atropisomer of meso-Tetra(o-aminophenyl)porphyrin
Authors: Nishino Norikazu , Kobata Keisuke , Mihara Hisakazu , Fujimoto Tsutomu
Published: May 2006

Unusual abundance of αβαβ-atropisomer of meso-tetra(o-nitrophenyl)porphyrin was observed in the thermal treatment in toluene. The reduction with SnCl2 and chromatographic separation gave the corresponding atropisomer of meso-tetra(o-aminophenyl)porphyrin in 52% yield.
Anodic gem-Difluorination of Dithioacetals
Authors: Yoshiyama Tomonori , Fuchigami Toshio
Published: May 2006

Anodic desulfurization of dithioacetals of ketones in the presence of Et3N·3HF provided the corresponding gem-difluorocompounds while dithioacetals of aromatic and aliphatic aldehydes gave gem-difluoro thioethers and monofluoro thioether, respectively.
Peruvianoside A, a Novel Migrated Lanostane Trisaccharide from Scilla peruviana
Authors: Mimaki Yoshihiro , Ori Kazutomo , Sashida Yutaka , Nikaido Tamotsu , Song Lian-Gang , Ohmoto Taichi
Published: May 2006

A novel migrated lanostane trisaccharide, named peruvianoside A, was isolated from the bulbs of Scilla peruviana. The structure was determined by extensive 2D NMR analysis.
Preparation of 13C-Poly(p-phenylene). IR, 13C-NMR, and ESR Spectra of the Polymer
Authors: Yamamoto Takakazu , Wataru Isao , Kanbara Takaki , Nakamura Yoshiyuki , Kikuchi Mizuyo , Ando Isao
Published: May 2006

13C-Enriched poly(p-phenylene) PPP prepared by dehalogenation polycondensation of 13C-enriched p-diiodobenzene with Ni(0) complex gives basic data for assignment of the IR vibration modes of PPP, reveals the magnitude of magnetic dipole interaction in the NMR spectrum, and indicates considerably small coupling of spin with 13C-nuclei in the ESR spectrum presumably due to rapid movement of electrons.
Extremely Promoted Guest Binding Ability of γ-Cyclodextrin Bearing a Pyrene Derivative on the Secondary Hydroxyl Side
Authors: Suzuki Iwao , Sakurai Yoshinobu , Ohkubo Masahiro , Ueno Akihiko , Osa Tetsuo
Published: May 2006

Guest binding ability of N-(l-pyrenecarbonyl)-3A-amino-3A-deoxy-(2AS,3AS)-γ-cyclodextrin (1) was evaluated by its fluorescence intensity variation induced by guest, and compared with that of primary hydroxyl side modified analogue (2). The results showed that 1 was an extremely better host than 2 in binding guest, promising that the secondary hydroxyl side modified CDs can become useful molecular recognition sensory systems.
N-Hydroxyamide-containing Heterocycles. New Effective Additives for Peptide Synthesis by the Dicyclohexylcarbodiimide Method
Authors: Katoh Akira , Ohkanda Junko , Itoh Yoshifumi , Mitsuhashi Keiryo
Published: May 2006

N-Hydroxyamide-containing heterocycles, 1-hydroxy-4,6-dimethyl-2(1H)-pyrimidinone and -5,6-dimethyl-2(1H)-pyrazinone, are prepared. Judging from the result of model dipeptide (Z-Ala-Phe-OMe) formation, these compounds are found to be new effective additives for peptide synthesis by the dicyclohexylcarbodiimide (DCC) method at the points of high yield and no detectable racemization.
Enhancement of Monovalent Cation Perm-Selectivity of Nafion by Plasma-Induced Surface Modification
Authors: Yasuda Kazuaki , Yoshida Tsutomu , Uchimoto Yoshiharu , Ogumi Zempachi , Takehara Zen-ichiro
Published: May 2006

Novel monovalent cation perm-selective membranes were prepared by the surface modification of perfluorosulfonate cation exchange membranes, Nafion. Nafion was sputtered with oxygen plasma in order to produce radical sites on its surface. Ultra-thin cationic layers was produced on the Nafion surface by reactions between the radical sites and 4-vinylpyridine vapor. The resultant membranes showed high monovalent cation perm-selectivity (transference number of divalent cation = 2 × 10−2) and low membrane resistance of 2 Ω cm2.
Stereochemistry of the Intramolecular Substitution of Phenylselenonyl Group by Nitrogen Atom in Amide. Inversion of Configuration
Authors: Toshimitsu Akio , Fuji Hidekiyo
Published: May 2006

The stereochemistry of the intramolecular substitution of phenylselenonyl group by a nitrogen atom in tosylamino group was proved to be inversion by the oxidative cyclization of (S)-1-alkyl-4-(tosylamino)butyl phenyl selenides to (R)-N-tosyl-2-alkylpyrrolidines.
Facile P-C Bond Cleavage in Bis(diphenylphosphino)methane with the Formation of New Pt(II) P, S-Chelates Containing a P-N Bond
Authors: Okeya Seichi , Shimomura Hiroshi , Kushi Yoshihiko
Published: May 2006

New platinum(II) P, S-chelates, (R = o-tolyl or Et(2b)), were prepared by a reaction of [Pt(dppm-H)2] with 1,3-disubstituted thioureas. A reaction intermediate, (R = o-tol), was isolated. Crystallographic X-ray analysis for 2b revealed a P, S-chelated structure containing a P-N bond.
Synthesis and DNA Cleaving Activity of Copper-complex of Macrocyclic Compound Containing 1,10-Phenanthroline
Authors: Hirai Miwa , Shinozuka Kazuo , Sawai Hiroaki , Ogawa Shojiro
Published: May 2006

Copper-complexes of 1,14: 7,8-diethenotetrapyrido-[2,1,6-de: 2′,1′,6′-gh: 2″, 1″, 6″-kl: 2″′,1″′, 6″′-na][1,5,8,12] tetraaza-[3,10] dithiocyclotetradecine (SMC) consisting of two 1,10-phenanthroline molecules bridged by sulfur, was synthesized. Interaction of Cu-SMC with DNA was examined by spectroscopic methods. Cu-SMC binds with DNA and cleaves DNA in the presence of a reducing agent under an aerobic condition.
A Novel 1,8-Photoaddition of Methyl 4-Cyanonaphthalenecarboxylate and 1,4-Naphthalenedicarbonitrile to Alkenes
Authors: Kubo Yasuo , Noguchi Tomonori , Inoue Takeo
Published: May 2006

A novel 1,8-photoaddition of methyl 4-cyano-1-naphthalenecarboxylate and 1,4-naphthalenedicarbonitrile to alkenes with high ionization potentials, a formal [3+2]photoaddition, was found to proceed stereospecifically possibly via a unique zwitter-ionic intermediate.
Synthesis, Spectroscopy, Electrochemistry, and Spectroelectrochemistry of a Zinc Phthalocyanine with D2h Symmetry
Authors: Kobayashi Nagao , Ashida Tohru , Osa Tetsuo
Published: May 2006

An efficient method is reported for the preparation of metallophthalocyanines (MtPcs) with D2h symmetry (di-substituted type). A ZnPc with D2h symmetry thus obtained has been characterized by NMR, absorption, fluorescence emission and excitation and magnetic circular dichroism (MCD) spectroscopy, together with differential pulse voltammetry.
A New Convenient Synthesis of α-Pyrone and α-Pyridone Derivatives
Authors: Nagao Yoshimitsu , Tohjo Toshiaki , Shiro Motoo , Yukimoto Yusuke , Shimada Sadakatsu
Published: May 2006

(4S)-Isopropyl-1,3-thiazolidine-2-thione diamide of 3-(t-butyldimethysilyloxy)glutaric acid was treated with bases to give α-pyrone and α-pyridone derivatives possessing a chiral thiazolidine moiety. On the other hand, treatment of the diamide with Sn(CF3SO3)2 and N-ethylpiperidine afforded the α-pyrone derivative exclusively.
Aldol-Type Reaction by Propen-2-yl Acetate with NCS/SnCl2/ROH
Authors: Masuyama Yoshiro , Kobayashi Yumiko , Yanagi Ryota , Kurusu Yasuhiko
Published: May 2006

The addition of N-chlorosuccinimide (NCS) to a solution of propen-2-yl acetate, aldehydes, SnCl2, and benzyl alcohol in CH2Cl2 or CH3CN caused an aldol-type reaction to produce 4-substituted 4-benzyloxybutan-2-ones in high yields. Use of methanol instead of benzyl alcohol produced not only 4-methoxybutan-2-one but also 3-buten-2-one by dehydromethoxylation.
A Highly Sensitive Analysis of Electrochemical Reduction Products of CO2 on Gold by New Differential Electrochemical Mass Spectroscopy (DEMS)
Authors: Fujihira Masamichi , Noguchi Toshimitsu
Published: May 2006

The products of electrochemical reduction of CO2 on gold were analyzed in-situ by new DEMS with a stationary gas-permeable gold electrode sputtered on a porous water-repellent membrane in a rotational flow produced by a rotating rod.
Synthesis and Electro-Optical Properties of Silicon-Containing Chiral Cyanocyclopropanes and γ-Lactones as Dopants for Ferroelectric Liquid Crystals
Authors: Kusumoto Tetsuo , Nakayama Akiko , Sato Ken-ichi , Hiyama Tamejiro , Takehara Sadao , Osawa Masashi , Nakamura Kayoko
Published: May 2006

Starting with (S)-1-chloro-2,3-epoxypropane optically active cyanocyclopropanes and cis-γ-lactones having a trialkylsilyl group in an alkyl side chain were synthesized and ferroelectric liquid crystals mixture containing one of these as a chiral dopant exhibited large spontaneous polarization.
Photochemistry of 9-Benzyloxytriptycenes
Authors: Iwamura Michiko , Mori Eiko , Koike Akemi , Kitagawa Tomoko , Koga Noboru , Iwamura Hiizu
Published: May 2006

The photochemical reactions of 9-benzyloxytriptycenes in methanol were found to give 2-(9-fluorenyl)benzaldehyde acetals and benzyl 2-(9-fluorenyl)phenyl ketones. Intermediacy of norcaradienes and two kinds of singlet carbenes has been demonstrated by quantum yields, light intensity dependence, competitive reactions, and substituent effects.
Rates of Oxygen Isotope Exchange and Ring Opening of Cyclic Sulfinate Esters
Authors: Okuyama Tadashi , Takano Hitomichi , Ohnishi Kazunori , Fueno Takayuki
Published: May 2006

Acid-catalyzed oxygen isotope exchange of the 6-membered cyclic sulfinate is faster than the 5-membered analog while the opposite reactivities were observed both in ring opening and closure reactions.
Biocatalytic Asymmetric Diels-Alder Reaction. Cycloaddition of Pyridazin-3-ones with Diethyl Azodicarboxylate
Authors: Kakulapati Rama Rao , Nanduri Bhanumathi , Yadavalli Venkata Durga Nageswar , Trichinapally Natesan Srinivasan
Published: May 2006

Baker’s yeast catalyses for the first time the asymmetric Diels-Alder reaction of pyridazinones with diethyl azodicarboxylate to yield optically active cycloadducts with an enantiomeric excess (ee) of upto 63%.
Electrochemical Properties of an Electrosynthesized Poly(p-phenylene vinylene) Film and Its Application to a Simple Electrochemical Fabrication of a Polymer Diode
Authors: Nishihara Hiroshi , Akasaka Masayoshi , Tateishi Masahiro , Aramaki Kunitsugu
Published: May 2006

Cyclic voltammetry of a poly(p-phenylene vinylene) (PPV) film prepared by electrochemical reduction of α,α,α′,α′-tetrabromo-p-xylene at Pt in THF shows an oxidation wave at ca. +0.8 V and a reduction wave at ca. −1.8 V vs. Ag/Ag+ in 1 mol dm−3 n-Bu4NBF4-MeCN. A polymer diode comprising cathodically polymerized PPV and anodically polymerized polypyrrole (PPy) can be fabricated by the simple one-pot electrochemical procedure.
A Novel π-Conjugated Organometallic Polymer, Molybdenum Tricarbonyl Modified Poly(n-hexylphenylene)
Authors: Funaki Hiroshi , Aramaki Kunitsugu , Nishihara Hiroshi
Published: May 2006

Electrochemical and electrical properties of soluble poly(n-hexylphenylene) bound to Mo(CO)3 were investigated by cyclic voltammetry, spectro-electrochemistry and four-electrode voltammetry. Oxidation of the Mo complex polymer occurs at E0′ = 0.51 V vs. Ag/Ag+, which is less positive than that of free poly(n-hexylphenylene) by ca. 0.3 V. At this potential, conductivity of the Mo complex polymer increases. The band gap of the polyphenylene does not change significantly by coordinating to Mo.
99Ru (←99Rh) as a TDPAC Probe in the Study of a High-Tc Superconductor
Authors: Ohkubo Yoshitaka , Kobayashi Yoshio , Ambe Shizuko , Harasawa Kaoru , Takeda Masuo , Shibata Seiichi , Asai Kichizo , Okada Takuya , Ambe Fumitoshi
Published: May 2006

A radiochemical procedure has been established to dope carrier-free 99Rh in YBa2Cu3O7−x. The time-differential perturbed-angular correlation of γ-rays emitted from the nuclear excited levels of the daughter nuclide 99Ru in the superconducting and semiconducting samples with x99Ru is a useful hyperfine-interaction probe comparable to 57Fe.0.2 and 1.0, respectively, revealed the hyperfine electric quadrupole interaction for the former and the magnetic interaction in addition for the latter. The results have shown that 99Ru is a useful hyperfine-interaction probe comparable to 57Fe.
Preparation and Activity of Layer Silicate-Supported Metal Catalyst
Authors: Ohtsuka Kunio , Koga Johji
Published: May 2006

A nickel(II) hydroxide-layer silicate intercalate was formed by mixing an expandable-layer silicate with a nickel(II) nitrate solution followed by urea hydrolysis at an elevated temperature. The hydrogen reduction of the intercalate generated nickel particles dispersed on the layer silicate crystal surface. The supported-nickel catalyst showed high activity for the hydrogenation of toluene to methylcyclohexane.
Cobalt(II) Complex Catalyzed Epoxidation of Olefins by Combined Use of Molecular Oxygen and Cyclic Ketones
Authors: Takai Toshihiro , Hata Eiichiro , Yorozu Kiyotaka , Mukaiyama Teruaki
Published: May 2006

In the presence of a catalytic amount of cobalt(II)-Schiff base complexes, various olefins are smoothly oxygenated into the corresponding epoxides in good to high yields by combined use of an atmospheric pressure of oxygen (oxidant) and cyclic ketones (reductant), such as 2-methylcyclohexanone, under mild conditions.
Study of the Internal Structure of Latex Dispersions by Laser Scanning Microscope. Confirmation of Void Structure
Authors: Ito Kensaku , Yoshida Hiroshi , Ise Norio
Published: May 2006

By using a confocal laser scanning microscope, the presence of stable, three-dimensional void structures in highly purified latex dispersions was confirmed.
A Novel Chain Compound Composed of Rhodium(II) Pivalate Dimer and 1,4-Benzoquinone
Authors: Handa Makoto , Takata Akihiro , Nakao Tadahiro , Kasuga Kuninobu , Mikuriya Masahiro , Kotera Takanori
Published: May 2006

The reaction of rhodium(II) pivalate dimer, Rh2(O2CCMe3)4 with 1,4-benzoquinone (BQ) in hexane gave a chain complex, [Rh2(O2CCMe3)4·BQ]n, where the rhodium(II) pivalate dimers are connected by the bifunctional ligation of the p-quinone through its carbonyl oxygen or C=C double bond.
Surface Modification of Polytetrafluoroethylene by KrF-Laser Irradiation
Authors: Nishii Masanobu , Sugimoto Shun’ichi , Shimizu Yuichi , Suzuki Nobutake , Nagase Tomohiro , Endo Masao , Eguchi Yosuke
Published: May 2006

The adhesive strength of polytetrafluoroethylene (PTFE) film was enhanced remarkably by KrF-laser irradiation in air when a small amount of aromatic polyester (APE) was blended with PTFE.
Electrochemical Formation of an Organic Thin Film Based on Dyeing with Vat Dye
Authors: Saji Tetsuo , Yamada Yukie , Tani Hisanao
Published: May 2006

A bluish green thin film of 16,17-dimethoxy-anthra[9,1,2- cde]-benzo-[rst]pentaphene-5,10-dione (1) was prepared on an indium tin oxide electrode by controlled potential electrolysis (oxidation) of an aqueous solution containing a leuco form of the vat dye (12−), Na2S2O4, and 0.1 M NaOH. Higher concentration of 12−, less positive electrolysis potential, and shorter electrolysis time produced a more transparent film.
Synthesis of Allyl Ester of Prostaglandin E and the Conversion of the Allyl Ester Moiety into Carboxylic Acid by Chemical Method. A Highly Practical Synthesis of Natural PGE1 and Limaprost
Authors: Ono Naoya , Tsuboi Mie , Okamoto Sentaro , Tanami Tohru , Sato Fumie
Published: May 2006

Synthesis of prostaglandin E allyl ester via two-component coupling process and the conversion of the allyl ester moiety into free carboxylic acid by the reaction with HCO2H-Et3N in the presence of a palladium catalyst has been described.
Generation of Cation Radicals from Enamines and Their Reactions with Olefins
Authors: Narasaka Koichi , Okauchi Tatsuo , Tanaka Ken , Murakami Masaharu
Published: May 2006

Cation radicals of enamines, generated by the oxidation with CeIV compounds, react with electron-rich olefins to give the addition products. The formal α-alkylation of formylacetate is realized by the reaction of 3-(1-pyrrolidinyl)propenoate and olefins by the use of tetrabutylammonium cerium(IV) nitrate as an oxidant.
2-Lithio-2-trimethylsilyl-1-silacyclopentane as a Synthetic Equivalent of 1-Lithio-1,4-butanediol
Authors: Matsumoto Kozo , Yokoo Toshiaki , Oshima Koichiro , Utimoto Kiitiro
Published: May 2006

Addition of alkyl iodide to 2-lithio-2-trimethylsilyl-1-silacyclopentane provided 2-alkyl-2-trimethylsilyl-1-silacyclopentane which was converted into 1-alkyl-1,4-butanediol by treatment with H2O2-KF and n-Bu4NF.
Reaction of Tetraazapentalene Derivatives Having Fused Cyclic Systems with the I2/NH4OH Reagent
Authors: Tomura Masaaki , Matsumura Noboru , Ito Atsushi , Inoue Hiroo , Yasui Masanori , Iwasaki Fujiko
Published: May 2006

Tetraazapentalene derivatives having fused cyclic systems reacted with the I2/NH4OH reagent to give 1,2,4-thiadiazolo[4,3-a]pyrimidine derivatives with the release of the hypervalent sulfur. The molecular structure of the product was determined by the X-ray crystallographic analysis.
Preparation of Perovskite-type LaFeO3 by Thermal Decomposition of Heteronuclear Complex, {La[Fe(CN)6]·5H2O}x
Authors: Nakayama Susumu , Sakamoto Masatomi , Matsuki Kimihiro , Okimura Yoshihisa , Ohsumi Rie , Nakayama Yusuke , Sadaoka Yoshihiko
Published: May 2006

Submicron perovskite-type, LaFeO3, powders were prepared by the thermal decomposition of a title cyanide-bridged heteronuclear complex. The decomposition begins at about 50 °C and the formation of LaFeO3 proceeds above 580 °C. Mean particle diameter and specific surface area were 50 nm and 22.7 m2/g, respectively, for the LaFeO3 obtained by calcining at 620 °C.
Synthesis of 2,2′-Anhydro-1-(3′-deoxy-3′-bromo-β-D-arabinofuranosyl)thymine and Its Derivatives from 5′-O-Trityl-2′,3′-thymidinene
Authors: Minamoto Katsumaro , Oishi Masataka , Kakehi Akikazu , Watanabe Kenji , Takeuchi Toyohide
Published: May 2006

Reaction of 5′-O-trityl-2′,3′-thymidinene with hypobromous acid gave 2,2′-anhydro-1-(3′-deoxy-3′-bromo-5′-O-trityl-β-D-arabinofuranosyl)-(5R,6R)-trans-5-bromo-6-hydroxy-5,6-dihydrothymine (3) and its (5S,6S) trans analogue (4). These were transformed into the corresponding 5,6-epoxy analogues. Compounds 3 and 4 were debromohydrinated to the title 2,2′-anhydro nucleoside in high yields.
Synthesis of Cesium Bismuth Molybdate Hydrate as a New Inorganic Ion Exchanger
Authors: Murakami Yasushi , Yamaguchi Fujito , Ishiyama Osamu , Imai Hisao
Published: May 2006

Cesium bismuth molybdate hydrate was synthesized from bismuth molybdate hydrate and cesium nitrate in aqueous solution, and reversively changed to bismuth molybdate hydrate in nitric acid. Cesium ion in cesium bismuth molybdate hydrate was easily exchanged with potassium, rubidium and ammonium ions while bismuth molybdate hydrate had no reaction except with cesium ion.
Preconcentration of Trace Metal Ions by Coprecipitation with Gallium Phosphate for Flameless Atomic Absorption Spectrometry
Authors: Kagaya Shigehiro , Kosumi Shiro , Ueda Joichi
Published: May 2006

Gallium phosphate was a useful coprecipitant for the preconcentration of lead(II), tin(IV), antimony(III), and bismuth(III) on the flameless atomic absorption spectrometry. The determination of trace amount of lead(II) in water was demonstrated.
Amino Silica Gels Acting as a Carbon Dioxide Absorbent
Authors: Tsuda Tetsuo , Fujiwara Tsuyoshi , Taketani Yasushi , Saegusa Takeo
Published: May 2006

Amino silica gels, silica gels bound with amines through covalent bond, were prepared by hydrolysis-condensation polymerization using three aminoalkyltrimethoxysilanes. The 2-[4-(2-aminoethylaminomethyl)phenyl]ethyl group absorbed CO2 with equal efficiency both in the silica gel and in the aminoalkyltrimethoxysilane. Suspension of amino silica gels in DMF and in water absorbed CO2 effectively and reversibly.
Novel Method for Preparation of 4-Oxo-2-alkenoic Acid Derivatives from 2,4-Alkadienoic Acid Derivatives by Cobalt(II) Porphyrin-catalyzed Oxygenation
Authors: Matsushita Yoh-ichi , Sugamoto Kazuhiro , Matsui Takanao
Published: May 2006

2,4-Alkadienoic acid derivatives such as ester, amide, and nitrile were converted to the corresponding 4-oxo-2-alkenoic acid derivatives in good yields by the oxygenation with oxygen and triethylsilane in the presence of a catalytic amount of [5,10,15,20-tetra(2,6-dichlorophenyl)porphinato]cobalt(II) followed by acetylation.
Reductive Addition of Alkyl Radical to Phenyl Vinyl Sulfone
Authors: Togo Hideo , Aoki Masahiko , Yokoyama Masataka
Published: May 2006

Radicals generated from (diacyloxyiodo)benzene readily added to phenyl vinyl sulfone to give 2-alkylethyl phenyl sulfone in the presence of a hydrogen donor such as 1,4-cyclohexadiene, 1,3-dioxolane, or triethylsilane. Among these donors, 1,4-cyclohexadiene was the most effective.
Stereocontrolled Reduction of 2-Acyl-1,3-oxathiane Derivatives by Zn(BH4)2 and YCl3-NaBH4
Authors: Matsubara Seijiro , Takahashi Hideya , Utimoto Kiitiro
Published: May 2006

Both enantiomers of 1,2-alkanediols were prepared by the diastereocontrolled reduction of ketones containing (R)-6-methyl-1,3-oxathiane moiety as a chiral auxiliary; reduction with Zn(BH4)2 selected one diastereoface to give one diastereomer and that with YCl3-NaBH4 produced another diastereomer selectively.
Generation of Tertiary Phosphine-Coordinated Pd(0) Species from Pd(OAc)2 in the Catalytic Heck Reaction
Authors: Ozawa Fumiyuki , Kubo Akihiko , Hayashi Tamio
Published: May 2006

Palladium(II) diacetate reacted with water (1 equiv./Pd) and (R)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl ((R)-BINAP) (3 equiv./Pd) in benzene in the presence of Et3N to give the palladium(0) species Pd[(R)-BINAP]2 (1 equiv./Pd), (R)-BINAP monoxide (1 equiv./Pd), and Et3N·HOAc (2 equiv./Pd). The progress of reaction strongly affected by the content of water in the reaction solution. The reduction of Pd(OAc)2 in the presence of PPh3 proceeded in a similar process to give Pd(PPh3)4 and OPPh3.