bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structure and Electrical Properties of MeDTET Salts
Authors: Misaki Yohji , Nishikawa Hiroyuki , Yamabe Tokio , Mori Takehiko , Inokuchi Hiroo , Mori Hatsumi , Tanaka Shoji 
Published: April 2006

Abstract
Several cation radical salts of MeDTET (2-isopropylidene-1,3-dithiolo[4,5-d]ethylenedithiotetrathiafulvalene) showed metallic temperature dependence of conductivity down to 0.6–0.9 K. X-Ray crystal structure of (MeDTET)3PF6TCEx revealed that the donors have “κ-type” arrangement in the conducting sheet. This is the first example of a κ-type salt that has a composition other than 2:1.
Porphyrins Coupled with Nucleoside Bases. Synthesis and Characterization of Ether-Linked Adenine-Thymine and Guanine-Cytosine Derivatives
Authors: Hisatome Masao , Ikeda Koichi , Kishibata Shusuke , Yamakawa Koji 
Published: April 2006

Abstract
Porphyrins having an adenine-thymine or guanine-cytosine pair have been synthesized. Spectroscopic study has revealed that the two nucleobases form inter- and intramolecular base pairs in anti and syn atropisomers, respectively, and that the guanine-cytosine pair is more close to the porphyrin ring than the adenine-thymine pair.
Calculation of Ternary Plait Point from Activity Coefficient Equation
Authors: Sugi Hiroshi , Kato Masahiro 
Published: April 2006

Abstract
Plait points are meaningful for the shapes of the ternary solubility curves. However, no report is found for calculation of the ternary plait point from activity coefficient equation. The ternary plait point was able to be calculated from the NRTL equation for three ternary systems.
Low-Temperature Synthesis of NdFe11TiCxNy via Plasma Carbonitriding
Authors: Machida Ken-ichi , Nakamoto Akira , Adachi Gin-ya 
Published: April 2006

Abstract
Carbonitriding characteristics of NdFe11Ti by applying the plasma technique to it in a CH4-N2-H2 mixed gas were studied. Carbon and nitorgen were simultaneously introduced to the NdFe11Ti crystal lattice even at 423 K, of which the electronic states were found to be of metal carbide and nitride, respectively.
Synthesis of Polygermanes by Ligand Substitution Polymerization of the 1,4-Dioxane Complex of Germanium Dichloride with Organolithium Compounds
Authors: Kobayashi Shiro , Cao Shaokui 
Published: April 2006

Abstract
Higher molecular weight polygermanes were synthesized by a ligand substitution polymerization of the 1,4-dioxane complex of germanium dichloride with organolithium compounds at a lower reaction temperature. Different from the conventional Wurtz-type coupling reaction, the present polymerization gives rise much higher yields of polygermanes.
The Catalytic Role of Iodide Ion / Iodine Couple in the Photo-Reduction of 10-Methylacridinium Ion with Diphenylphosphine Oxide
Authors: Yasui Shinro , Shioji Kosei , Ohno Atsuyoshi , Yoshihara Masakuni 
Published: April 2006

Abstract
Photo-redox between diphenylphosphine oxide and 10-methylacridinium iodide with visible light in aqueous acetonitrile under argon atmosphere is initiated by single electron transfer from the phosphorus compound to the acridinium salt in the photo-excited state giving diphenylphosphinic acid and 10-methylacridan as the final products. Iodide ion/iodine couple plays a crucial role for transferring an electron in this reaction.
An Efficient Procedure for Synthesis of Phosphopeptides through the Benzyl Phosphate-Protection by the Boc Mode Solid-Phase Method
Authors: Wakamiya Tateaki , Saruta Kunio , Kusumoto Shoichi , Nakajima Kiichiro , Yoshizawa-Kumagaye Kumiko , Imajoh-Ohmi Shinobu , Kanegasaki Shiro 
Published: April 2006

Abstract
The benzyl phosphate-protection for phosphoamino acid is very useful for Boc mode solid-phase synthesis of phosphopeptides. A phosphothreonine-containing peptide related to the EGF receptor protein was synthesized by use of this methodology.
Ortho Enhancement in the Ozone-Mediated Nitration of Some Aromatic Carbonyl Compounds with Nitrogen Dioxide
Authors: Suzuki Hitomi , Murashima Takashi , Tatsumi Atsuo , Kozai Iku 
Published: April 2006

Abstract
Alkyl aryl ketones react smoothly with nitrogen dioxide at low temperatures in the presence of ozone to give a mixture of ortho and meta nitration products (o/m = 1.1–3.8/1.0), the former becoming predominant with the increasing size of alkyl moiety.
Norrish Type I Reaction of Diphenyltetrahydrobenzocycloheptenones. Conformational Effects on Biradical Lifetime
Authors: Tanaka Ryoko , Kuriyama Yasunao , Itoh Hiroki , Sakuragi Hirochika , Tokumaru Katsumi 
Published: April 2006

Abstract
Isomeric 6,6-diphenyl-6,7,8,9-tetrahydro-5H-benzocyclohepten-7-one and 7,7-diphenyl-6,7,8,9-tetrahydro-5H-benzocyclohepten-6-one (2) were photolyzed in methanol to give rise to unsaturated aldehydes as well as diphenyltetrahydronaphthalene, a decarbonylation product (for 2). Lifetimes of the intermediate triplet biradicals were dependent on their structures, indicating that cyclic conformations play an important role in the intersystem crossing of biradicals.
Electron Transfer vs. Nucleophilic Addition of Ketene Silyl Acetals with Halogenated p-Benzoquinone Derivatives
Authors: Fukuzumi Shunichi , Fujita Morifumi , Matsubayashi Gen-etsu , Otera Junzo 
Published: April 2006

Abstract
A β,β-dimethyl-substituted ketene silyl acetal reduces p-chloranil to produce the carbon-oxygen adduct, the hydrolysis of which yields the corresponding hydro-quinone ether (3). The structure of 3 has been determined by the X-ray crystal analysis. On the other hand, the reaction of a nonsubstituted ketene silyl acetal with p-fluoranil yields the carbon-carbon adduct selectively. The mechanistic difference between the C-O and C-C bond formation is elucidated based on the kinetic study.
Novel Columnar Liquid Crystals Designed from Cone-shaped Calix[4]arenes. The Rigid Bowl Is Essential for the Formation of the Liquid Crystal phase
Authors: Komori Takashi , Shinkai Seiji 
Published: April 2006

Abstract
Conformationally-immobile calix[4]arenas with a cone conformation coupled to C6H4-p-CmH2m+1 (m = 3, 8, 12, 14, and 16) via an azomethine linkage were synthesized. It was found that the compounds with m ≥ 8 have the liquid crystal phase with a columnar arrangement.
Synthesis of Tetrasubstituted Butenolide, Bromobeckerelide, by Regioselective Lithiation of Furan Followed by Photosensitized Oxygenation of α-Silylfuran
Authors: Katsumura Shigeo , Ichikawa Koji , Mori Hajime 
Published: April 2006

Abstract
A straightforward synthesis of a tetrasubstituted halobutenolide, bromobeckerelide, was achieved by photosensitized oxygenation of a trisubstituted α-trialkylsilylfuran which was obtained by the introduction of desired substituents into a furan ring via regioselective lithiation.
De Novo Design and Synthesis of Four α-Helix Bundle Proteins with Flavin Function
Authors: Mihara Hisakazu , Tomizaki Kin-ya , Nishino Norikazu , Fujimoto Tsutomu 
Published: April 2006

Abstract
Four α-helix bundle proteins containing flavin moieties (7-acetyl-10-methylisoalloxazine) were de novo designed and synthesized. The artificial proteins could effectively catalyze the oxidation of dihydronicotinamides under controlled conditions for bundle structure.
Surface-Enhanced Raman Scattering from Silver Salt of Carboxymethylcellulose Photolyzed with UV-Light
Authors: Miyama Toshihito , Yonezawa Yoshiro , Sato Tomoo , Umemura Junzo , Takenaka Tohru 
Published: April 2006

Abstract
A Raman signal arising from carboxylate ions in thin films of silver salt of carboxymethylcellulose (CMCAg film) was fairly increased, when the CMCAg film was photolyzed with UV-light. The maximum enhancement was achieved in the CMCAg film irradiated for 180 min. It is likely that the intensity enhancement of the carboxylate ions reflects the contribution of surface-enhanced Raman scattering (SERS).
Absolute Conformation of Methyl 3-(1,4-Dimethoxy- and 1,4-dimethyl-9-triptycyl)-3-methylbutanoate Rotamers
Authors: Toyota Shinji , Miyasaka Tsutomu , Oki Michinori 
Published: April 2006

Abstract
The racemates of the rotational isomers of the mother acids of the title compounds were resolved via their camphor sultam amides and their absolute conformation was determined by X-ray crystallography. The chiroptical properties of the methyl esters are correlated with the absolute conformations. Both of these compounds are shown to possess dextrorotatory property at Na D line, if their stereochemistry is Psc.
New Analytical Chemiluminescence System Using Peroxymonosulfate as Oxidant
Authors: Makita Yuji , Umebayashi Hidetoshi , Suzuki Takehiko , Masuda Akio , Yamada Masaaki , Hobo Toshiyuki 
Published: April 2006

Abstract
Transition metal ion- and ketone-catalyzed decompositions of peroxymonosulfate ion were found to produce light emission. The luminous decompositions permitted flow chemiluminescent determinations of cobalt(II), iron(II) and vanadium(IV) ions and fluorescent organic compounds.
Anomalous Lifetime Shortening of S1 trans-Stilbene in Carbon Tetrachloride as Revealed by Picosecond Time-resolved Raman, Absorption, and Fluorescence Spectroscopies
Authors: Iwata Koichi , Toleutaev Bulat , Hamaguchi Hiro-o 
Published: April 2006

Abstract
The lifetime of the first excited singlet state of trans-stilbene (S1 tSB) in carbon tetrachloride at room temperature is determined to be 3.1 ± 0.2 ps with the use of time-resolved Raman, absorption, and fluorescence spectroscopies. The lifetime of 3.1 ps is shorter than the shortest value ever reported by an order of magnitude. The steady state photoirradiation of tSB in carbon tetrachloride shows that the decomposition of the tSB molecule is the primary cause of the lifetime shortening.
Dissociative Path Promoted by Ion Pair Formation for Acetonitrile Exchange Reaction of the Palladium(II) Complex with Diethylenetriamine
Authors: Aizawa Sen-ichi , Yagyu Takeyoshi , Funahashi Shigenobu 
Published: April 2006

Abstract
The acetonitrile exchange rates at the palladium(II) complex with diethylenetriamine have been measured at various temperatures by the NMR line-broadening method. The dependence of the exchange rate on the concentration of the free solvent indicates the two reaction paths with dissociative and associative mechanisms. This unique concerted mechanism has been ascribed to the promotion of the dissociative path by the ion pair formation with tetrafluoroborate.
Palladium(II)-Catalyzed Cyclocarbonylation of Enol Ester of Acetone. A Novel Synthesis of 1,3-Dioxolan-4-one
Authors: Kudo Kiyoshi , Mitsuhashi Koichi , Mori Sadayuki , Komatsu Koichi , Sugita Nobuyuki 
Published: April 2006

Abstract
The cyclocarbonylation of isopropenyl acetate(1) to produce 2-methoxy-2,5,5-trimethyl-1,3-dioxolan-4-one(2) by use of palladium(II)-phoshine catalyst with methanol in benzene solution was studied at 100 °C under 200 atm of CO. Conversion of up to 98% and yield to 2 as high as 67% were attained.
Direct Observation of Phase Separation in LB Film Composed of Polyamic Acid Long Alkyl Amine Salts by Using Friction Force Microscope (FFM)
Authors: Yuba Tomoyuki , Kakimoto Masa-aki , Imai Yoshio , Shigeno Masatsugu 
Published: April 2006

Abstract
The surface of a LB film of polyamic acid long alkyl amine salts, consisted of a mixture of aromatic and aliphatic polyamic acids, was observed by means of friction force microscopy (FFM). The LB film having 11 layers gave no significant pattern by atomic force microscopy (AFM), whereas clearly phase separated morphology was observed by using FFM.
Preparation and Structure of Oxo-bridged Dinuclear Vanadium(III) Complex [VIII2(l-his)4(μ-O)]·2H2O
Authors: Kanamori Kan , Teraoka Michiko , Maeda Haruyo , Okamoto Ken-ichi 
Published: April 2006

Abstract
The synthesis, structure, and properties of a l-histidinato vanadium(III) complex, [VIII2(l-his)4O)]·2H2O, are reported. Crystal structure analysis has revealed that the complex is an oxo-bridged dimer with the V-O-V angle of 153.9(2)° and at each vanadium(III) center one l-his ligand coordinated tridentately and the other didentately. The visible absorption and resonance Raman spectra show the characteristic feature of the oxo-bridged vanadium(III) complexes.
Osmium-Catalyzed Oxidative Transformation of Alkenes to α-Ketols with Peracetic Acid
Authors: Murahashi Shun-Ichi , Naota Takeshi , Hanaoka Hidenori 
Published: April 2006

Abstract
The OsCl3-catalyzed oxidation of alkenes with peracetic acid at room temperature gives the corresponding α-ketols, which are important building units for synthesis of biological active compounds.
Prediction of Structural Effects of Trialkylsilyl Groups on Reactivity toward Nucleophilic Displacement at Silicon
Authors: Shimizu Nobujiro , Takesue Naohide , Yasuhara Sigefumi , Inazu Takahiko 
Published: April 2006

Abstract
A quantitative method of predicting reactivities of trialkylsilyl groups relative to Me3Si toward nucleophilic displacement at silicon has been established on the basis of statistical analyses of the rates of solvolysis for a comprehensive series of chlorosilanes in aqueous dioxane.
Synthesis and Structure of a Novel Doubly Bridged Dinuclear Cobalt(III) Peroxo Complex [(tren)Co(μ-O2)(μ-S2O3)Co(tren)]I2 [tren = tris(2-aminoethyl)amine]
Authors: Yamanari Kazuaki , Mori Masahiro , Dogi Shozo , Fuyuhiro Akira 
Published: April 2006

Abstract
A novel (μ-peroxo)(μ-thiosulfato) bridged cobalt(III) complex [(tren)Co(μ-O2)(μ-S2O3)Co(tren)]2+ [tren = tris(2-aminoethyl)amine] was prepared. The complex shows a characteristric UV/VIS absorption spectrum and the X-ray crystal structure reveals that the complex has an unprecedented large Co-O-O-Co torsion angle 75.5(2)°.
Doping Effect of Polyaniline Derivatives on Synthetic Metal Catalytic System for Dehydrogenative Oxidation of Benzylamine
Authors: Hirao Toshikazu , Higuchi Masayoshi , Ohshiro Yoshiki , Ikeda Isao 
Published: April 2006

Abstract
The catalytic activity of polyaniline derivatives in the dehydrogenative oxidation of benzylamme to N-benzylidenebenzylamine is effected by protonic acid doping.
Cryoprotection of Synthetic Glycolipids for Phospholipid Vesicles
Authors: Sakai Hiromi , Takisada Mikimasa , Takeoka Shinji , Tsuchida Eishun 
Published: April 2006

Abstract
The synthetic glycolipid; N-hexadecylmaltopentaonamide (HDMPA), was introduced as a component of a phospholipid vesicle (φ, ca. 100 nm) of 1,2-dipalmitoyl-sn-glycero-3-phosphorylcholine (DPPC) to modify the surface of the vesicle with oligosaccharide. After freeze-thawing, the size of the vesicles does not change, and the leakage of 5(6)-carboxyfluorescein encapsulated into the vesicles is suppressed, indicating that the glycolipid possesses a cryoprotective activity.
Double Alkylation of Tin Enolate Derived from Diketene and Bis(tributyltin) Oxide
Authors: Shibata Ikuya , Nishio Masahiro , Baba Akio , Matsuda Haruo 
Published: April 2006

Abstract
Tin enolate derived from diketene and (n-Bu3Sn)2O was alkylated by alkyl halides, leading to mono-alkylated enolate via facile decarboxylation, which successively react with other electrophiles like an aldehyde and alkyl halides to furnish double-alkylated acetones.
Laser-Induced Photoionization of Two-Electron-Reduced Viologen
Authors: Usui Satoshi , Inoue Hiroshi , Ishida Hitoshi , Ohkubo Katsutoshi 
Published: April 2006

Abstract
Laser photolysis of two-electron-reduced 1,1′-bis(3-sulfonatepropyl)-4,4′-bipyridinium (PVS2−) produced by the reduction of PVS0 with Na2S2O4 in the cationic micelles of hexadecyltrimethylammonium chloride induced the photoionization of PVS2− to generate comparable amounts of PVS−• and hydrated electrons. Pyrene with a considerably negative reduction potential of −2.09 vs. SCE was observed to be reduced in the system.
Catalytic Cyclooctane Photodehydrogenation at Unusually Low Photon Energy with a Dinuclear Iridium Complex
Authors: Itagaki Hiroaki , Einaga Hisahiro , Saito Yasukazu 
Published: April 2006

Abstract
Photoirradiation on an A-frame dinuclear complex Ir2(μ-S)(CO)2(dppm)2 caused catalytic dehydrogenation of cyclooctane, where effectiveness was proved for all the absorption bands in the visible region (λmax: 360, 418, and 520 nm).
Stereoselective Synthesis of (±)-7β-Acetoxyvouacapane
Authors: Wang Feng , Chiba Kazuhiro , Tada Masahiro 
Published: April 2006

Abstract
A tetracyclic furano diterpene, 7β-acetoxyvouacapane was stereoselectively synthesized via the route involving alkylation reaction of 2-methyl-3-furoic acid and stereoselective reductive hydrolysis of a tosylhydrazone.
The SmI2 Mediated Cross-Coupling Reaction of Aldehydes with α-Diketones in Their Aqueous Forms
Authors: Miyoshi Norikazu , Takeuchi Seiji , Ohgo Yoshiaki 
Published: April 2006

Abstract
By the use of samarium diiodide (SmI2), a cross-coupling reaction of aldehydes with α-diketones smoothly proceeds in the presence of water to give the corresponding adducts in moderate to good yield. In this reaction, it is possible to use the substrates such as phenylglyoxal monohydrate, aqueous methylglyoxal, formalin, and aqueous α-chloroacetaldehyde.
Preparation of ZnO Films by Low-pressure Organometallic Chemical Vapor Deposition
Authors: Kobayashi Kenkichiro , Matsubara Toshihiro , Matsushima Shigenori , Okada Gengi 
Published: April 2006

Abstract
Using zinc acetate as a precursor, ZnO films have been prepared on sapphire () substrates at pressures of 2.7 × 10−2 and 6.7 × 10−3 Pa. The deposition rate increased with substrate temperature. The crystal structure of ZnO film was dependent on the substrate temperature and H2O partial pressure. In particular, oriented () ZnO films have been formed at 350 °C at 2.7 × 10−2 Pa.
1,3-Dioxane-Bridged Pyromellitimide-Pyropheophorbide and Pyropheophorbide Dimer
Authors: Osuka Atsuhiro , Marumo Shinji , Konishi Norifumi , Maruyama Kazuhiro , Yamazaki Iwao , Yamazaki Tomoko , Shirakawa Yoshihiro , Nishimura Yoshinobu 
Published: April 2006

Abstract
1,3-Dioxane-bridged pyromellitimide-pyropheophorbide dyads were synthesized by simple acid-catalyzed reaction of methyl pyropheophorbide-d and a pyromellitimide-substituted diol. A bis-1,3-dioxane-bridged pyropheophorbide dimer was similarly prepared by the reaction of methyl pyropheophorbide-d and pentaerythritol. Intramolecular electron-transfer and energy-transfer reactions in these models have been studied by picosecond fluorescence measurements.
A Facile Synthesis of 2,3-Dihydroxyketones from 1,2-Diketones and Aldehydes Using Samarium Diiodide
Authors: Miyoshi Norikazu , Takeuchi Seiji , Ohgo Yoshiaki 
Published: April 2006

Abstract
In the presence of samarium diiodide, 1,2-diketones react with aldehydes to afford the corresponding 2,3-dihydroxyketones in good yields with moderate diastereoselectivity. The reaction of unsymmetrical 1,2-diketones with aldehydes gives the products with high regioselectivities.
Serum and Urine Tissue Kallikrein Concentrations in Male-to-Female Transsexuals Treated with Antiandrogens and Estrogens
Authors: Slagter Margrita H , Gooren Louis JG , de Ronde Willem , Soosaipillai Antoninus , Scorilas Andreas , Giltay Erik J , Paliouras Miltiadis , Diamandis Eleftherios P 
Published: April 2006

AbstractBackground: The expression of human tissue kallikrein genes is regulated by steroid hormones, but most studies have been conducted with cancer cell lines. Our purpose was to examine serum and urinary tissue kallikrein concentration changes in male-to-female transsexuals before and after treatment with antiandrogens and estrogens.Methods: Thirty-five male-to-female transsexuals receiving cyproterone acetate and estrogens (orally or transdermally) were included in this study. Serum and urine samples were collected before initiation of therapy and 4 and 12 months post therapy. ELISAs were used to measure multiple kallikreins in serum and urine.Results: After antiandrogen and estrogen therapy, serum testosterone concentrations decreased dramatically, as did serum and urinary concentrations of human glandular kallikrein (hK2) and prostate-specific antigen (PSA; hK3). Statistically significant but relatively small changes in serum and urinary concentrations of many other kallikreins were also seen. Kallikreins in serum and urine were correlated before and after treatment.Conclusions: The concentrations of hK2 and hK3, but not of any other kallikreins, decrease dramatically after combined antiandrogen and estrogen treatment in male-to-female transsexuals. The smaller responses of the other kallikreins presumably reflect their expression in multiple tissues.
News factors and news decisions. Theoretical and methodological advances in Germany
Authors: Eilders Christiane 
Published: April 2006

AbstractNews value research has contributed a great deal to the understanding of news selection. For a long time scholars focused exclusively on news selection by the media. Yet, more recent approaches — inspired by cognitive psychology — have conceptionalized news factors as relevance indicators that not only serve as selection criteria in journalism, but also guide information processing by the audience. This article examines the theoretical and methodological developments in the German research tradition and discusses selected results for newspaper and television news. Its theoretical perspective focuses on the conceptionalization of news factors as either event characteristics or characteristics of the reality construction by journalists and recipients. This article explores how and why news factors affect media use and the retention of news items. Finally, this contribution's empirical perspective discusses various modifications of the assumed factors and presents methodological advancements in the measurement of news factors in selection processes.
Predicting news decisions. An empirical test of the two-component theory of news selection
Authors: Kepplinger Hans Mathias , Ehmig Simone Christine 
Published: April 2006

Abstract
The purpose of this study is to test the two-component theory of news selection. Its components are (a) news factors included in articles and (b) news values of news factors. It is assumed that news factors have different news values for various media outlets. The theory was tested comparing the empirical (measured) with the theoretical (calculated) newsworthiness of news stories. First, news values of five news factors for national quality papers, regional papers, and tabloids were identified. Then, based on theory, the theoretical newsworthiness of news stories was calculated. The independent variables were the news factors included in these articles and the news values of these news factors. In addition, in a laboratory setting, the empirical newsworthiness of the news stories was measured. Finally, measured newsworthiness was compared to the predicted one. Results confirmed the two-component theory and demonstrated that the chances of news stories to get published can be predicted by news factors and their news values.
Die Zukunft der DDR-Geschichte. Potentiale und Probleme zeithistorischer Forschung
Authors: Bispinck Henrik , Hoffmann Dierk , Schwartz Michael , Skyba Peter , Uhl Matthias , Wentker Hermann 
Published: April 2006

Vorspann
Seit Jürgen Kocka die DDR-Forschung zum Auslaufmodell erklärt hat, überschlagen sich ihre Nothelfer schier mit Vorschlägen, wie Remedur zu schaffen sei: Weg von einer staatlich-nationalen Betrachtungsweise, hin zu einer Einbettung der DDR-Geschichte in transnationale, europäische und globale Bezüge, so lautet der vorgeschlagene Paradigmenwechsel. Die Verfasser des Aufsatzes, sämtlich Mitarbeiter der Berliner DDR-Forschungsabteilung des Instituts für Zeitgeschichte, plädieren dafür, die Kirche im Dorf zu lassen. Gerade zur Untersuchung der DDR biete ein – methodisch offener –politikgeschichtlicher Zugriff nach wie vor die besten Erkenntnischancen.