bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of an Odd-Even Relationship on the Aggregation Modes of “Gemini”-type Cholestrol-Based Gelators and Their Transcription into Silica Gel
Authors: Jung Jong Hwa , Ono Yoshiyuki , Shinkai Seiji 
Published: October 2004

Abstract
Four “gemini”-type cholesterol-based gelators 1n were synthesized. They acted as versatile gelators of organic fluids. The xerogels show lamellar structures for 12 and 14 and fiber structures for 13 and 15 according to the even or odd number of alkyl chains between two nitrogens. The difference in these organogel supramolecular structures has successfully been transcribed into the silica structures by sol-gel polymerization of tetraethoxysilane (TEOS). These results indicate that the novel silica structures can be created by transcription of various superstructures in organogels as a template through the hydrogen-bonding interaction.
Synthesis of BaCO3 Nanowires and Nanorods in the Presence of Different Nonionic W/O Microemulsions
Authors: Zheng Nengwu , Wu Qingsheng , Ding Yaping , Li Yadong 
Published: October 2004

Abstract
Several one-dimensional nanomaterials(wires and rods) of BaCO3 were synthesized in the presence of the nonionic w/o micro-emulsions of Tween-80, Triton X-100 and C12E9. The intermediate and middle course of BaCO3 nanowires formation were captured, and the formation mechanism of the one-dimensional nanomaterials was conjectured as directional aggregation of BaCO3 colloid particles controlled by soft microemulsion template.
Synthesis of Novel Type Resin Based on Calix[4]arene Carboxylate and Selective Separation of Lead from Zinc
Authors: Shinohara Takaaki , Wakisaka Shin-ya , Ohto Keisuke , Inoue Katsutoshi 
Published: October 2004

Abstract
A novel type of resin derived from calix[4]arene carboxylate was synthesized and adsorption behavior for lead(II), zinc(II), copper(II), nickel(II), and cobalt(II) was investigated. Further, column separation of lead(II) from zinc(II) was also carried out. Adsorption equilibria of metal ions showed following order of selectivity series among metal ions: Pb(II) &gt;&gt; Cu(II) &gt; Zn(II) &gt; Co(II) = Ni(II). Separation of lead and zinc using the packed column was sufficiently achieved.
Ion Conductive and Flexible DNA Films
Authors: Ohno Hiroyuki , Takizawa Naomi 
Published: October 2004

Abstract
Ion conductive film was prepared from flexible poly(ethylene oxide) (PEO) and double stranded DNA chains from salmon milt. The ionic conductivity of this DNA/PEO film was greatly improved by the addition of NaClO4. The highest ionic conductivity of 4.2 × 10−4 S cm−1 was observed at 25 °C.
Molecular Assembly of Manganese Fluorinated Mesoporphyrin Monolayer on a Gold Electrode
Authors: Yamada Taku , Kikushima Seiji , Hikita Takami , Nara Akishi , Nishio Etuo , Ohtsuka Toshiaki , Nango Mamoru 
Published: October 2004

Abstract
Disulfide-linked manganese mesoporphyrin derivatives separated by spacer methylene groups (Figure 1) were synthesized and then the porphyrin derivatives were assembled on a gold electrode. Cyclic voltammetry (CV) of the porphyrin monolayer on a gold electrode showed that one set of waves was clearly visible, corresponding to the consecutive monoelectronic reduction of the manganese porphyrin unit, depending upon the spacer methylene groups. Interestingly, a large positive-shift of the redox potential for the mesoporphyrin was observed due to fluorination of the porphyrin ring.
The First Total Synthesis of Natural (−)-Tetracycline
Authors: Tatsuta Kuniaki , Yoshimoto Takuji , Gunji Hiroki , Okado Yoshiya , Takahashi Masaaki 
Published: October 2004

Abstract
Natural (−)-tetracycline has been stereoselectively synthesized from d-glucosamine through [4 + 2] cycloaddition and Michael-Dieckmann type reaction.
De Novo Design of Hemoprotein Model with Peroxidase Activity toward Lipophilic Peroxide
Authors: Tomizaki Kin-ya , Nishino Hidekazu , Kato Tamaki , Miike Akira , Nishino Norikazu 
Published: October 2004

Abstract
A single-chained 49-mer-polypeptide tethering iron(III)-porphyrin folded into a certain conformation with bis-histidine coordination and consumed favorably linoleic acid hydroperoxide rather than H2O2.
A New Cooling-Rate Dependent Thermochromism of Poly(dioctylsilane)
Authors: Kanai Toshinobu , Ishibashi Hiroki , Hayashi Yoshikazu , Ogawa Tatsuo , Furukawa Shoji , West Robert , Dohmaru Takaaki , Oka Kunio 
Published: October 2004

Abstract
A rapidly cooled poly(dioctylsilane) (PDOS) is found to exhibit unprecedented thermochromic behavior showing λmax at 353 nm as the major absorption which is accompanied with a minor one at 375 nm. On heating, the absorption at 353 nm begins to decrease at 250 K and, then, the minor one does at 280 K. Similar temperature dependent behavior is observed in the X-ray powder diffraction around 2θ = 6° which is ascribable to inter-chain alignment. On heating diffraction at 2θ = 6.2° (d = 1.43 nm) disappears firstly, and then that at 6.4° (d = 1. 38 nm) is displaced by the diffraction at 5.8° (d = 1.52 nm).
Suspended Spray Reaction for Preparation of Ru/Al2O3 Catalyst
Authors: Tsuchiya Takeshi , Ichikuni Nobuyuki , Shimazu Shogo , Uematsu Takayoshi 
Published: October 2004

Abstract
Ru/Al2O3 catalysts were prepared by a suspended spray reaction (SSP) method applying a high temperature at 1273 K. The particles of SSP-Ru/Al2O3 were spherical sub-micron composites. The ruthenium species were not sintered but highly dispersed with small crystallite size (&lt; 2 nm) over Al2O3 that retained the original surface area.
An Optically Active Diarylethene Having Cholesterol Units: A Dopant for Photoswitching of Liquid Crystal Phases
Authors: Uchida Kingo , Kawai Yuji , Shimizu Yo , Vill Volkmar , Irie Masahiro 
Published: October 2004

Abstract
A diarylethene1 having cholesterol units was synthesized in an attempt to use it as a dopant to control the phase of liquid crystals. By the addition of the diarylethene, 4-cyano-4′-pentylbiphenyl (K-15)(Tokyo kasei) nematic liquid crystal showed cholesteric liquid crystalline texture. Upon irradiation with UV light, the cholesteric phase was decomposed. The cholesteric phase was recovered by visible light irradiation. The reversible photoinduced-phase change was observed by alternate irradiation with UV and visible light.
Electrochemical Measurement of Dissolved Oxygen from Atmosphere in a Highly Homogeneous Magnetic Field
Authors: Kishioka Shin-ya , Yamada Akifumi , Aogaki Ryoichi , Kiyoshi Tsukasa , Goto Atsushi , Shimizu Tadashi 
Published: October 2004

Abstract
In a very highly homogeneous magnetic field generated by the 270 MHz high resolution NMR magnet system, the accelerated dissolution of atmospheric oxygen into water was confirmed.
Trimerization of a Divalent Silicon Species Bearing the 8-Dimethylamino-1-naphthyl Group Accompanied by the Migration of Methyl and Dimethylamino Groups
Authors: Tamao Kohei , Asahara Masahiro , Toshimitsu Akio 
Published: October 2004

Abstract
A divalent silicon species bearing the 8-(dimethylamino)-1-naphthyl group trimerizes to afford a 1,2-disilaacenaphthene framework incorporated in a trisilane chain and accompanied by the migration of the methyl and dimethylamino groups.
Nucleophilic Addition of a Divalent Silicon Species Bearing the 8-Dimethylamino-1-naphthyl Group to Diphenylacetylenes to Form the 1-Amino-1-silaphenalene Skeleton
Authors: Tamao Kohei , Asahara Masahiro , Saeki Tomoyuki , Feng Shengyu , Kawachi Atsushi , Toshimitsu Akio 
Published: October 2004

Abstract
A 1-amino-1-silaphenalene skeleton is formed by the reaction of a divalent silicon species bearing the 8-(dimethylamino)-1-naphthyl group with diphenylacetylene via an alkenyl anion intermediate.
X-Ray Crystal Structure and Electrochemical Behavior of (5R,5′S)-5,5′-Biguaiazulene-3,3′(5H,5′H)-dione
Authors: Takekuma Shin-ichi , Fukunaga Hideo , Takekuma Hideko , Yamamoto Hiroshi 
Published: October 2004

Abstract
Oxidation of guaiazulene (1) with a 2.5 molar amount of m-chloroperbenzoic acid in ethanol at 0 °C for 1 h under aerobic conditions gives a ca. 2:1:1 mixture of meso and two enantiomeric forms of 5,5′-biguaiazulene-3,3′(5H,5′H)-dione (2), which upon recrystallization from dichloromethane-hexane selectively provides the single crystals of its meso form only. The first X-ray crystallographic analysis and the electrochemical behavior on the title meso form are reported.
Intramolecular [3 + 2]Cycloaddition Reaction of Dipolar Trimethylenemethane
Authors: Nakamura Masaharu , Toganoh Motoki , Wang Xio Qun , Yamago Shigeru , Nakamura Eiichi 
Published: October 2004

Abstract
A variety of alkylidenecyclopropanone acetals possessing a terminal diylophile were allowed to undergo an intramolecular [3 + 2]cycloaddition via a dipolar trimethylenemethane to obtain bicyclo[4.3.0] and [3.3.0] carbo- and heterocycles in good yields. The product selectivities were rigorously controlled by the concerted or stepwise nature of the cycloaddition reaction.
New Synthetic Protocol with Trifluoro-1-propynylamines. An Efficient Access to α-(Trifluoromethyl)-δ-keto Amides via Hetero Diels-Alder Reaction
Authors: Mantani Toshiya , Konno Tsutomu , Ishihara Takashi , Yamanaka Hiroki 
Published: October 2004

Abstract
N,N-Dibutyl(3,3,3-trifluoro-1-propynyl)amine readily reacts with α,β-unsaturated ketones or aldehydes in refluxing benzene for 3–36 h to form the corresponding Diels-Alder adducts, 2-(dibutylamino)-3-(trifluoromethyl)-4H-pyrans, of which the successive treatment with alumina at ambient temperature for 1 h leads to the ring-opening products, α-trifluoromethylated δ-keto amides in fairly good to excellent yields.
Preparation and Photoelectrochemical Properties of a Self-Assembled Monolayer of a Ruthenium Tris(2,2′-bipyridine)-viologen 1:2 Linked Compound
Authors: Terasaki Nao , Akiyama Tsuyoshi , Yamada Sunao 
Published: October 2004

Abstract
A ruthenium tris(2,2′-bipyridine)-viologen 1:2 linked disulfide was prepared. A gold electrode modified with this compound showed a higher efficiency of photocurrent as compared with a corresponding 1:1 linked compound.
Preparation of UV-dye TMQ-Doped Silica Film and Xerogel by Sol-gel Method
Authors: Dong Wenting , Zhu Congshan 
Published: October 2004

Abstract
UV dye TMQ-doped silica film and slab were prepared by sol-gel process with dioxane as cosolvent of the initial solutions. The maxima TMQ concentrations in the initial solutions for the transparent silica film and slab are 1.24 × 10−2 M and 1.5 × 10−3 M respectively. Luminescence quenching was not observed when TMQ concentration for the film is less than 6.2 × 10−3 M. Obvious red shift of absorption and emission maxima was observed, comparing with those of TMQ-cyclohexane solution.
A Route to Functionalized (η3-Allyl)dicarbonylnitrosyliron Complexes: Regio- and Stereoselective Acylmetallation of Allenes
Authors: Itoh Keiji , Nakanishi Saburo , Takata Toshikazu 
Published: October 2004

Abstract
Allenes regio- and stereoselectively react with alkyl halides in the presence of tetrabutylammonium tricarbonylnitrosyl ferrate to give anti-(η3-2-acylallyl)dicarbonylnitrosyliron complexes in good yields. The reaction provides a convenient method for preparation of di- and trisubstituted η3-allyl iron complexes with acyl groups at the central carbon of the allylic ligands.
Selective Synthesis of Methylal from Methanol on a New Crystalline SbRe2O6 Catalyst
Authors: Yuan Youzhu , Liu Haichao , Imoto Hideo , Shido Takafumi , Iwasawa Yasuhiro 
Published: October 2004

Abstract
A novel SbRe2O6 catalyst was active for the selective methanol oxidation to methylal (CH2(OCH3)2). Other known Sb-Re oxides, Sb4Re2O13 and SbOReO4·2H2O produced almost no methylal. The bulk and surface of the SbRe2O6 catalyst was characterized by XRD, Raman, XPS and SEM. The high performance of SbRe2O6 may be attributed to the Re-oxide octahedra connecting with Sb-O chains.
Photocurrent Generation by the Self-Assembled Monolayers Integrating a Photoenergy-Harvesting System and an Electron-Transport System of Helical Peptide
Authors: Morita Tomoyuki , Kimura Shunsaku , Kobayashi Shiro , Imanishi Yukio 
Published: October 2004

Abstract
A self-assembled monolayer (SAM) composed of a dialkyl compound carrying an N-ethylcarbazolyl (Ecz) group and a helical peptide carrying an anthryl (Ant) group was prepared on gold. The photocurrent magnitude of the bicomponent SAM in the presence of an electron acceptor was larger than that of the unicomponent SAMs. The efficient photocurrent generation of the bicomponent SAM is due to the integration of the photoenergy-harvesting and electron-transport systems.
First ‘Back-to-back’ Shaped Compartmental Ligand; Structural Characterization of a Tetranuclear Zinc(II) Complex in a Highly Flattened Form
Authors: Asato Eiji , Chinen Mitsuyoshi , Yoshino Atsushi , Sakata Yoshiteru , Sugiura Ken-ichi 
Published: October 2004

Abstract
Schiff-base condensation of 3,3′,5,5′-tetraformyl-4,4′-biphenyldiol, which was converted from 4,4′-biphenyldiol by a modified Duff reaction, and N,N-diethylethylenediamine in the presence of Zn(CH3CO2)2 followed by the addition of excess NH4PF6 gave a tetrazinc complex [Zn4(L)(µ-CH3CO2)4](PF6)2 (1), where L2− is a new ligand bearing four Schiff-base and two phenoxo-bridging moieties; structure of 1 was fully characterized by X-ray crystallography.
Radical-Cation Salts Based on Brominated and Chlorinated Ethylenedioxytetrathiafulvalenes
Authors: Iyoda Masahiko , Ogura Eiji , Takano Takahiro , Hara Kenji , Kuwatani Yoshiyuki , Kato Takehiro , Yoneyama Naoki , Nishijo Jun-ichi , Miyazaki Akira , Enoki Toshiaki 
Published: October 2004

Abstract
Radical-cation salts derived from 4,5-dibromo-4′,5′-ethylenedioxy- and 4,5-dichloro-4′,5′-ethylenedioxytetrathiafulvalenes (EDO-TTFBr2 and EDO-TTFCl2) showed metallic conductivities in spite of their electron-withdrawing substituents.
An Application of the Water/Supercritical CO2 Microemulsion to a Novel “Microreactor”
Authors: Kometani Noritsugu , Toyoda Yuji , Asami Kenji , Yonezawa Yoshiro 
Published: October 2004

Abstract
Water/supercritical CO2 microemulsions were prepared by using ammonium carboxylate perfluoropolyether (PFPE) as a surfactant. The de-aggregation of the J-aggregate of cyanine dyes and the formation of fairly small silver particles in these microemulsions would indicate the realization of the chemical reactions in the small space. In this sense, the water/supercritical microemulsion is regarded as a novel “microreactor” of the nanometer size.
Convenient Synthesis of Poly(butylene succinate) Catalyzed by Distannoxane
Authors: Takahashi Hiroyuki , Hayakawa Teruaki , Ueda Mitsuru 
Published: October 2004

Abstract
A convenient method for the synthesis of poly(butylene succinate) (1) of high molecular weight has been developed. This polyester was prepared readily by the distannoxane-catalyzed polycondensation of succinic acid (2) with 1,4-butanediol (3) in decalin at 190 °C under azeotropic condition. The polycondensation proceeded in decalin-melted polymer two-phase, giving 1 with the number average molecular weight of 150000.
Concentration Dependent Photodimerization of Azobenzenes in Solution
Authors: Kojima Masanobu , Takagi Tomoko , Karatsu Takashi 
Published: October 2004

Abstract
Cis-trans photoisomerization of azobenzenes in higher concentrations proceeds through a bimolecular reaction process, probably involving the dimer biradical intermediates, in competition with a unimolecular isomerization process, which is the predominant reaction in lower concentrations.
Preparation and Properties of π-Conjugated Polymer with Phenazasiline Units
Authors: Hayashi Hideki , Nakao Hidenobu , Adachi Akira , Kimura Hideaki , Okita Koichi , Hayashi Teruyuki , Tanaka Masato 
Published: October 2004

Abstract
Poly(phenazasiline)s (PPhenaz) and related phenazasiline copolymers having arylenediethyndiyl units in the backbone (PPhE) were prepared by organometallic processes. PPhenaz films show reversible electrochromic behavior upon electrochemical treatment. A double layer electroluminescent device comprising PPhenaz with n-C8H17 groups bound to the silicon displays high performance similar to those comprising a typical hole-transport material, poly(N-vinylcarbazole).
New-Type Ordering Behavior in the Layered Perovskite Compound RbLa2Ti2NbO10
Authors: Hong Young-Sik , Kim Keon 
Published: October 2004

Abstract
Layered perovskite compound RbLa2Ti2NbO10 has been successfully characterized by the Rietveld analysis of powder X-ray diffraction pattern and lattice energy calculation. The RbLa2Ti2NbO10 represents a unique example of layered perovskite in which equal numbers of Ti4+ and Nb5+ cations were statistically distributed in the outer octahedra, and only Ti4+ cations occupied the middle octahedra.
A Novel Activating Agents of ‘Disarmed’ Thioglycosides, Combination of Trityl Tetrakis(pentafluorophenyl)borate, Iodine and 2,3-Dichloro-5,6-dicyano-p-benzoquinone (DDQ)
Authors: Takeuchi Kazuya , Tamura Takayuki , Jona Hideki , Mukaiyama Teruaki 
Published: October 2004

Abstract
A combined use of trityl tetrakis(pentafluorophenyl) borate [TrB(C6F5)4], iodine (I2) and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) effectively activates “disarmed” thioglycosides to afford the corresponding disaccharides in high yields on treatment with several glycosyl acceptors.
Vapor-Phase Asymmetric Hydroformylation
Authors: Nozaki Kyoko , Shibahara Fumitoshi , Hiyama Tamejiro 
Published: October 2004

Abstract
Polystyrene-supported (R,S)-BINAPHOS–Rh complex was demonstrated to be applicable to the asymmetric hydroformylation of gaseous substrates in a non-solvent system: 3,3,3-trifluoropropene (2a) and (Z)-2-butene (2b) were converted into the corresponding branched aldehydes with 90% and 80%ee, respectively.
Trifluoromethanesulfonic Acid (TfOH)-Catalyzed Stereoselective Glycosylation Using Glycosyl Fluoride
Authors: Mukaiyama Teruaki , Jona Hideki , Takeuchi Kazuya 
Published: October 2004

Abstract
Stereoselective glycosylation of 2-O-benzoyl-3,4,6-tri-O-benzyl-β-d-glucosyl fluoride 6 with several glycosyl acceptors is successfully carried out by using a catalytic amount of trifluoromethanesulfonic acid (TfOH).
Chiral Recognition of Ru(phen)32+ by Anionic Cyclodextrins
Authors: Kano Koji , Hasegawa Hideki 
Published: October 2004

Abstract
Chiral recognition of Ru(phen)32+ (phen = 1,10-phenanthroline) by heptakis(6-carboxymethylthio-6-deoxy)-β-cyclodextrin heptaanion (per-CO2−-β-CD) in D2O has been studied by means of 1H NMR spectroscopy. The binding constant for the Δ-Ru(phen)32+ complex (K = 1250 dm3 mol−1) is about 2.1-times larger than that for the Λ-isomer (DDG = 1.9 kJ mol−1). A clockwise helix-configuration of the Δ-isomer may well fit to the asymmetrically twisted CD cavity.
Formation of Outer- and Inner-Sphere Complexes of Lanthanide Elements at Montmorillonite-Water Interface
Authors: Takahashi Yoshio , Tada Akisa , Kimura Takaumi , Shimizu Hiroshi 
Published: October 2004

Abstract
The distribution of 14 lanthanide elements (Ln) between water and montmorillonite’s surface was simultaneously determined by ICP-MS. From the dependence of the distribution coefficients on the atomic number of Ln, the formation of outer- or inner- sphere complexes with the surface of montmorillonite was estimated. The formation of the outer-sphere complex was also confirmed by the quenching of the fluorescence from Eu(III) ion due to the hydrated water.
Molybdenum Nitride As a Long Lifetime Catalyst for Hydrodesulfurization
Authors: Nagai Masatoshi , Kiyoshi Masaru , Tominaga Hiroyuki , Omi Shinzo 
Published: October 2004

Abstract
The molybdenum nitride catalysts are long-lifetime catalysts due to resistance to carbon deposition compared to the sulfided catalysts. The deactivation of the molybdenum nitride catalysts at the initial stage was related to the depositions of sulfur and carbon at the steady state.
Competitive Attachment of Alkali Cations to Poly(ethylene glycol) and Poly(propylene glycol) Oligomers in Matrix-Assisted Laser Desorption/Ionization Process
Authors: Togashi Hisashi 
Published: October 2004

Abstract
In the attachment reaction of poly(ethylene glycol) oligomers, consisting of 7-13 monomers, with Li+ or K+ in matrix-assisted laser desorption/ionization process, Li+-attached oligomer distribution shows larger fraction of small oligomer ions than K+-attached oligomer distribution, while both distributions are similar to each other for poly(propylene glycol) (6-11 monomers), indicating that the chemical structure of chain is essential in the cationization reaction for linear polyglycols.
Per-C-6 Oligosaccharide-Branched Cyclodextrin Interacting with Both the Lectin and Drug
Authors: Yasuda Naoyoshi , Aoki Nobuyoshi , Abe Hideyoshi , Hattori Kenjiro 
Published: October 2004

Abstract
The improved dual interactions with both the lectin (PNA, a cellular receptor model) and an anticancer drug (DXR) have been observed in per-C-6 oligosaccharide-branched cyclodextrin (2) using an optical biosensor based on SPR.
Distribution Spectrum of Paraoxonase Activity in HDL Fractions
Authors: Bergmeier Christoph , Siekmeier Rüdiger , Gross Werner 
Published: October 2004

AbstractBackground: Paraoxonase (PON1) associated with HDL can be regarded as a cardio- and vasoprotective enzyme. However, because HDL is not a homogeneous fraction, it is important to investigate in which subgroups of HDL active PON1 is located. It would also be useful to determine density profiles of the HDL apolipoproteins (Apo) E and J.Methods: We investigated the density range of HDL (ρ = 1.063–1.256 kg/L) in healthy individuals, using the ultracentrifugation reference method and a newly introduced automated fractionation method. Profiles of PON1 activity and ApoA-I, ApoA-II, ApoE, ApoJ, and cholesterol concentrations were obtained by use of various density gradients.Results: PON1 activity was highest in the more dense HDL3 and VHDL fractions where PON1 was not dissociated from the particles during centrifugation. The fraction in density range 1.175–1.185 kg/L showed not only the highest PON1 activity, but also the highest specific activity (activity per HDL particle). This fraction was the least-dense fraction containing both ApoE and ApoJ. Only the Q192R polymorphism had an effect on the distribution profile of PON1 activity. In contrast, L55M and the T(−107)C polymorphisms (determined by a novel nonradioactive method) were without effect on the density distribution of PON1 activity.Conclusion: The HDL3 fraction, which is important in reverse cholesterol transport, also carries the highest PON1 activity.