bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dansyl and Indolyl Groups as a Probing Pair for Intersegmental Arrangement in Four α-Helix Bundle Structure of a Polypeptide
Authors: Nishino Norikazu , Mihara Hisakazu , Uchida Toshiharu , Fujimoto Tsutomu 
Published: March 2006

Abstract
Dansylaminoalanine and tryptophan were separately incorporated into the α-helical segments of the four α-helix bundle structure of a 53-peptide. The perfect transfer of fluorescence energy of the indolyl group to the dansyl moiety was observed in aqueous solution by the emission at 480 nm upon excitation at 280 nm. The addition of MeOH unfolded the bundle structure and resulted in the interruption of the efficient energy transfer.
Decomposition of Chlorinated Hydrocarbons in Aqueous Solutions by Ultrasonic Irradiation
Authors: Inazu Koji , Nagata Yoshio , Maeda Yasuaki 
Published: March 2006

Abstract
Trichloroethylene, tetrachloroethylene, 1,1,1-trichloroethane, chloroform and carbon tetrachloride in dilute aqueous solutions were rapidly decomposed to chloride anions, hydrogen, carbon monoxide and carbon dioxide by ultrasonic irradiation.
Tryptophan 2,3-dioxygenase-like Activity of Monoclonal Antibody Anchored by a Manganese(III) Porphyrin Complex
Authors: Ohkubo Katsutoshi , Ishida Hitoshi , Sagawa Takashi , Urabe Kenji , Seri Kei-ichi , Suga Mamoru 
Published: March 2006

Abstract
Anchoring of a manganese(III) porphyrin complex to monoclonal (or polyclonal) antibody performed with the p-nitrophenylamino moiety of the complex, and this antibody anchored by the metal complex showed efficient catalytic activity and stereoselective ability for tryptophan 2,3-dioxygenase like dioxygenolyses of N-acetyl- L(and/or D)-tryptophan methyl esters in THF/H2O (pH 8.0) under atmospheric O2 at 25 °C.
Crystal Structures of Cation-Radical Salts of a Bis(1,3-dithiole) Donor Containing a 1,2,5-Thiadiazole Unit
Authors: Yamashita Yoshiro , Tanaka Shoji 
Published: March 2006

Abstract
X-Ray analyses of PF6 and BF4 cation-radical salts of 4,7-bis(4,5-dimethyl-1,3-dithiol-2-ylidene)-4,7-dihydro-2,1,3-benzothiadiazole reveal that the PF6 salt showing a metallic behavior has a uniform stacking of donor molecules, while the BF4 salt showing a semiconducting behavior has a dimeric structure.
Infrared Spectra of Frozen Clay-Water System
Authors: Mizoguchi Masaru , Low Philip F 
Published: March 2006

Abstract
Infrared spectra of 0.12 mm thick frozen clay-water system were obtained at sub-zero temperature with a FTIR spectrometer. The absorbances at the frequency of 2700 cm−1 decreased gradually with increasing temperature. The freezing point depression determined by the absorbance increased with clay and salt concentrations.
Acid-catalyzed Facile Racemization of Axially Dissymmetric 2′-Hydroxy-1,1′-binaphthyl-2-carboxylic Acid
Authors: Oi Shuichi , Kawagoe Kazumasa , Miyano Sotaro 
Published: March 2006

Abstract
Axially dissymmetric 2′-hydroxy-1,1′-binaphthyl-2-carboxylic acid was synthesized and shown to rapidly racemize in 1 mol dm−3 sulfuric acid in dioxane at 100 °C. The lactone obtained from enantiomerically pure (S)-3 gave racemic 3 on hydrolysis, showing that the first example of a facile atropisomerization of 2,2′-disubstituted 1,1′-binaphthyls was ascribed to lactonization-ring opening.
Utility of 3,4-Dimethoxybenzyl (DMPM) Glycosides. A New Glycosylation Triggered by 2,3-Dichloro-5,6-dicyano-p-benzoquinone (DDQ) Oxidation
Authors: Inanaga Junji , Yokoyama Yasuo , Hanamoto Takeshi 
Published: March 2006

Abstract
A new glycosylation which proceeds through the formation of charge transfer (CT) complex of DMPM glycosides with DDQ followed by the oxidation-triggered fragmentation of the intermediates has been developed. Primary, secondary, and tertiary alcohols are used as glycosyl acceptors for the formation of 2-deoxyglycoside derivatives.
A New Glycosphingolipid from the Red Alga Corallina pilulifera
Authors: Ishida Ryoichi , Shirahama Haruhisa , Matsumoto Takeshi 
Published: March 2006

Abstract
A new glycosphingolipid, named coralipid, has been isolated from a red alga and its structure has been determined to be (6E,15′Z,2S,3S,4R,2′R)-N-(2′-hydroxy-15′-tetracosenoyl)-1-O-β-galactosyl-2-amino-6-octadecene-1,3,4-triol on the basis of spectral and chemical means.
Selectivity in Oxidation of Sulfides with Hydrogen Peroxide by [π-C5H5N+(CH2)15CH3]3PM12O403− and [π-C5H5N+(CH2)15CH3]3{PO4[M(O)(O2)2]4}3− (M = Mo or W)
Authors: Ishii Yasutaka , Tanaka Hiroyuki , Nishiyama Yutaka 
Published: March 2006

Abstract
Dramatical difference in selectivity was observed in the hydrogen peroxide oxidation of sulfides by [π-C5H5N+(CH2)15CH3]3PW12O403− (CWP) and [π-C5H5N+(CH2)15CH3]3{PO4[W(O)(O2)2]4}3− (PCWP) under the two-phase system using chloroform as the solvent. The oxidation of sulfides with 35% H2O2 by CWP afforded the corresponding sulfoxides in high selectivity (93–99%), while the same oxidation by PCWP gave sulfones exclusively.
A Stereoselective Synthesis of a Novel Model Compound of Carzinophilin Carrying the C6-C13 Unit with Correct Stereochemistry
Authors: Hashimoto Masaru , Terashima Shiro 
Published: March 2006

Abstract
The title synthesis was achieved by featuring stereocontrolled elaboration of the functionalized pyrrolidine-2-thione from 2,3,5-tri-O-benzyl-β-d-arabinofuranose and base-induced construction of an aziridine ring from the 5-mesyloxymethylpyrrolidine.
A New Aerobic Oxidation System Using Pd-Cu Catalysts in the Presence of CO
Authors: Miyamoto Masanori , Minami Yumiko , Ukaji Yutaka , Kinoshita Hideki , Inomata Katsuhiko 
Published: March 2006

Abstract
Oxidation of benzylic ethers, tosylamides, and 9,10-dihydroanthracene could be performed efficiently under O2 and CO atmosphere in the presence of PdCl2-CuCl2 catalysts to give the corresponding esters (lactones), amides and anthraquinone, respectively.
Synthesis of Oligosilanes by Electrolysis of Hydrosilanes
Authors: Kimata Yoshinori , Suzuki Hiroshi , Satoh Shin , Kuriyama Akira 
Published: March 2006

Abstract
The novel electrochemical reaction of hydrosilane compounds was investigated for the synthesis of polysilanes. The product obtained by electrolysis of Methylphenylsilane 1a was an oligosilane of Mn = 454 (GPC) in 60% yield, which consisted of Si-Si bonds for the main chain. When diphenylsilane was electrolyzed in a similar manner as 1a, the major product was a dimer in 23% yield.
Reactions of Aryl Azides with Cobaltadithiolenes. Substitution Reactions via Nitrene
Authors: Katsuta Hideaki , Noguchi Naoko , Inomata Yohsuke , Kajitani Masatsugu , Akiyama Takeo , Sugimori Akira 
Published: March 2006

Abstract
Two types of substitution reactions occur between arylnitrene from aryl azides (1) and a cobaltadithiolene, (η5-cyclopentadienyl)(1,2-dicyano-1,2-ethenedithiolato)cobalt(III): 1) replacements of S by arylimino groups and 2) replacements of S–CX=CX moiety of a cobaltadithiolene by a biradical form of nitrene to give (η5-cyclopentadienyl)(2-imino-κN-arene-1-thiolato-κS)cobalt(III) (5). The reaction of 1 with a cluster compound [Cp4Co4S6] gives also 5.
A Novel Transamination Induced by Terpyridine Ligand Coordinated on Cobalt(III) Ion
Authors: Jitsukawa Koichiro , Hata Tomio , Yamamoto Tetsuya , Kano Keiko , Masuda Hideki , Einaga Hisahiko 
Published: March 2006

Abstract
The reaction of salicylidene-l-alanine with the Co(III) complex involving 2,2′:6′,2″-terpyridine (terpy) in aqueous ethanol solution afforded a peculiar transamination to form the complex, [Co(α-hydroxy salicylidene-o-hydroxybenzylamine)(terpy)]+, whose structure has been confirmed by X-ray structure analysis and positive FAB mass spectrometry.
Synthesis of σ−π Conjugated Alternating Silylene-Diacetylene Copolymers and Their Optical and Electrical Properties
Authors: Fang Mao-Ching , Watanabe Akira , Matsuda Minoru 
Published: March 2006

Abstract
New σ-π conjugated alternating silylene-diacetylene copolymers, –[(SiMe2)m–C≡C–C≡C]n–, m = 1, 3, 4, and 6, were synthesized by the reaction of α,ω-dichloropermethylated oligosilanes with dilithiobutadiyne, LiC≡C–C≡CLi. The IR spectra clearly indicated the presence of diyne unit in the polymer backbone. The influence of the chain length m of the dimethylsilylene unit in the –[(SiMe2)m–C≡C–C≡C]n– backbone on the optical and the electrical properties was investigated.
10,10-Dimethylanthrone-2,7-dinitrene. A Planar-Constrained, Doubly-Disjoint High-Spin Molecule with a Singlet Ground State
Authors: Ling Chris , Lahti Paul M 
Published: March 2006

Abstract
Photolysis of 10,10-dimethylanthrone-2,7-diazide in a glassy matrix at 77 K gives the corresponding quintet dinitrene molecule with a singlet ground state (ΔE(S → Q) = 810 J/mol). This system shows disjoint exchange behavior in a case where conjugation is assured by an enforced planar geometry.
The Selectivity of NaZnPO4 in the Dehydrogenation of Alcohols
Authors: Aramendia M Angeles , Borau Victoriano , Jimenez César , M. Marinas José , Romero F José 
Published: March 2006

Abstract
This paper reports on the activity and selectivity of a NaZnPO4 catalyst in the gas-phase dehydrogenation of primary and secondary alcohols. The catalyst was synthesized here for the first time and exhibited excellent selectivity in the processes studied.
Rise in Transition Temperature of γ-Fe2O3 Particles to α-Fe2O3 by SiO2 Coating
Authors: Ohmori Masahiro , Deki Shigehito 
Published: March 2006

Abstract
Transition temperature(Tt) of acicular γ-Fe2O3 particles to α-Fe2O3 shifted to a higher temperature by SiO2 coating. X-ray diffraction patterns and magnetic properties measured by VSM showed that γ-Fe2O3 particles still existed at more than 600 °C. The stabilized γ-Fe2O3 particles were expected to be used as recording pigments for heat-stable recording media.
The Dansyl Group as a Molecular Probe for the Histochemical Localization of a Synthetic Fibronectin-related Peptide
Authors: Yamamoto Yasuo , Katow Hideki , Sofuku Shosuke 
Published: March 2006

Abstract
A fibronectin-related cystine peptide was synthesized and was connected with dansyl group to locate its binding sites in sea urchin embryo. The dansyl peptide bound to the basal surface of ectoderm and the primary mesenchyme cell.
Effects of Pretreatment of Zao Zhuang and Akabira Bituminous Coals with SiCl4-NaI Reagents on Pyrolytic Behavior of Extracts
Authors: Yamamoto Akira , Murata Satoru , Nomura Masakatsu 
Published: March 2006

Abstract
The effects of pretreatment of Zao Zhuang and Akabira coals with SiCl4-NaI reagents (for cleavage of ether bonds) on Curie-point pyrolytic behavior of the extracts were investigated. While this treatment showed a slight increase of extraction yield, the volatile yield of extracts greatly increased along with increasing amounts of highly condensed aromatic constituents in the volatile.
Reverse Water-Gas Shift Reaction Catalyzed by Ruthenium Cluster Anions
Authors: Tominaga Ken-ichi , Sasaki Yoshiyuki , Hagihara Kohnosuke , Watanabe Taiki , Saito Masahiro 
Published: March 2006

Abstract
Reverse water-gas shift reaction (H2 + CO2 → CO + H2O) was homogeneously catalyzed by anionic Ru cluster in the presence of bis(triphenylphosphine)imminium chloride ([PPN]Cl). The catalytic reaction was estimated to proceed via dehydrogenation of hydride cluster, followed by coordination of CO2 and electrophilic attack of proton on its oxygen atom in the presence of chloride anion.
Selective Photooxidation of Propane to Propanone over Alkali-ion-modified Silica-supported Vanadium Oxides
Authors: Tanaka Tsunehiro , Takenaka Sakae , Funabiki Takuzo , Yoshida Satohiro 
Published: March 2006

Abstract
The addition of alkali ions (Na, K and Rb) to silica-supported vanadium oxide results in the formation of surface vanadate species which is excited by the light with wavelengths of around 400 nm. Propanone was selectively formed from propane and oxygen over alkali-ion-modified silica-supported vanadium oxides by the photoirradiation of light with wavelengths of λ &gt; 390 nm.
Fluorescence Analysis of ANS Interacting with Individual Laser-Trapped Microspheres Having Different Surface Properties
Authors: Pfeifer-Fukumura Ursula , Misawa Hiroaki , Fukumura Hiroshi , Masuhara Hiroshi 
Published: March 2006

Abstract
Polystyrene microspheres were modified with polar and nonpolar groups. A fluorescent probe with spectral properties sensitive to environments was used to characterize the surface. Using the technique of laser trapping the fluorescence spectrum of the dye could be observed from a single particle dispersed in solution.
Stereoselective Synthesis of 2-Alkylamino-N-(2′-alkylphenyl)succinimide Conformers
Authors: Kishikawa Keiki , Tsuru Isao , Kohmoto Shigeo , Yamamoto Makoto , Yamada Kazutoshi 
Published: March 2006

Abstract
Isolable conformers of 2-alkylamino-N-(2′-alkylphenyl)succinimide were stereoselectively synthesized by amination of N-(2′-alkylphenyl)maleimides. The rotational barrier and the α-methylation of them were investigated.
Substituent Effect on Gas Phase Basicity of cis 2-Phenyl-2-butene. Intrinsic Resonance Demand of α,α-Dialkylbenzyl Carbocations
Authors: Mishima Masaaki , Nakamura Hirotaka , Nakata Kazuhide , Fujio Mizue , Tsuno Yuho 
Published: March 2006

Abstract
The gas phase basicities of cis 2-aryl-2-butenes have been determined by measuring proton transfer equilibria. It has been shown that the substituent effect on the stability of the conjugate acid ion of the olefin, α-ethyl-α-methylbenzyl cation, is in complete agreement with that of α-cumyl cation, suggesting that α,α-dialkyl benzyl cations seem likely to be characterized by the r value of 1.0 given by the LArSR analysis.
Construction of the C46-C55 Fragment of Ciguatoxin
Authors: Oka Takahiro , Murai Akio 
Published: March 2006

Abstract
The compound with all the necessary functional groups of the KLM ring system in ciguatoxin, which is one of the most complicated toxic substances of marine origin, was synthesized stereoselectively. The crucial steps involve construction of the ethynyl alcohol, the δ-valerolactone, and the natural acetals.
Ion Complex Type of Novel Chiral Smectic C* Liquid Crystal Having Chiral Hydrogentartrate Counterion
Authors: Ujiie Seiji , Iimura Kazuyoshi 
Published: March 2006

Abstract
A chirally ionic liquid crystal (ICLC) was prepared by the complexation of L(+)-tartaric acid and an achiral mesogenic group (NLC) with an amine unit, and its liquid crystalline behavior was examined by DSC, polarizing microscopy, and X-ray techniques. Ionic ICLC formed smectic A and chiral smectic C* phases. Due to an ionic aggregation, ionic ICLC exhibited a higher mesomorphic-isotropic phase transition temperature when compared to nonionic NLC.
Facile Synthesis of Both syn and anti Homoallylic Alcohols from Allyl Chlorides via Organosilicon Intermediates
Authors: Kobayashi Shu , Nishio Koichi 
Published: March 2006

Abstract
Highly regio- and diastereoselective synthesis of homoallylic alcohols from allyl chlorides via organosilicon intermediates are attained. While syn homoallylic alcohols were prepared from (Z)-allyl chlorides, anti homoallylic alcohols were obtained from (E)-allyl chlorides. 1-Chloro-2,4-pentadiene reacted at the γ position of the diene system regioselectively.
2-Amino-1-phenyl-1,3-propanediol Derivatives. New Ligands for Asymmetric 1,4-Addition of Organozinc Reagents to Enones
Authors: Fujisawa Tamotsu , Itoh Satoru , Shimizu Makoto 
Published: March 2006

Abstract
In the presence of (1S,2S)-3-benzyloxy-2-morpholino-1-phenylpropanol derived readily from (1S,2S)-2-amino-1-phenyl-1,3-propanediol and nickel acetylacetonate, diethylzinc added to α,β-unsaturated ketones to give alkylated product in high optical purity (up to 95%ee). The effects of solvents and additives and the use of such ligands as a chiral catalyst were also investigated.
A New Synthetic Method of Macrocylic Lactones from ω-Iodoalkylacrylates
Authors: Abe Motoji , Hayashikoshi Takaoki , Kurata Takeo 
Published: March 2006

Abstract
When the photostimulated cyclization reaction of ω-iodoalkylacrylates was performed in the presence of metal hydride complexes such as sodium cyanoborohydride(NaBH3CN), sodium borohydride(NaBH4) and potassium borohydride(KBH4), the corresponding macrocyclic lactones were produced. The use of NaBH3CN led to the highest yield of lactones.
Quantitative Analysis of Ethanol in Water Solution by a Heterocontact-type Sensor of CuO/ZnO
Authors: Hirota Koitsu , Miyayama Masaru , Nakamura Yoshinobu , Yanagida Hiroaki 
Published: March 2006

Abstract
Methods of quantitative analysis in the system of ethanol-water were investigated using a heterocontact-type sensor consisted of semiconducting ceramics of copper oxide (CuO) and zinc oxide (ZnO). The current-voltage (I-V) characteristics of the heterocontact in the solutions changed depending on the ethanol concentration when measured at AC 50 Hz at room temperature. It was found that the ethanol concentration can be determined quantitatively by analyzing the shape of I-V hysteresis loop.
The Oxidation of Dimethyl 2-Hydroxy-5-isopropylazulene-1,3-dicarboxylat and Its 6-Isopropyl Isomer with Lead Dioxide - The First Formation of a Diethenodicyclopenta[ef:kl]heptalene Derivative -
Authors: Lin Yun-Shan , Lin Shih Jue , Huang Tian-Chyuan , Chen Fa-Ching , Morita Tadayoshi , Kurihara Teruo , Nozoe Tetsuo 
Published: March 2006

Abstract
Oxidation of dimethyl 2-hydroxy-6-isopropylazulene-1,3-dicarboxylate (1a) with lead dioxide in acetic acid gave a 1,1′-bi-[2(1H)azulenone] derivative in good yield. The similar reaction of 5-isopropyl isomer of 1a gave two 1,1′-bi-[2(1H)azulenone] and a novel diethenoazupyrene derivative, as the first example, through 1,6′-coupling reaction followed by intramolecular Diels-Alder type cyclization.
Mg2+-Selective Electrode Comprising Double-Helical DNA as Receptive Entity
Authors: Maeda Mizuo , Nakano Koji , Uchida shinji , Takagi Makoto 
Published: March 2006

Abstract
Cyclic voltammograms of ferrocyanide/ferricyanide redox couple with a DNA-immobilized electrode gave the peak currents due to the reversible electrode reaction, which were significantly enhanced on adding Mg2+. The electrode responded also to Ca2+ and Ba2+, although the onset concentrations of the electrode response were 50-times larger than that for Mg2+. The selectivity in the order of Mg2+ &gt; Ca2+, Ba2+ &gt;&gt; Na+, K+ seems consistent with the binding affinity of the metal ions with double-helical DNA.
A New Alkoxyiodination and Nitratoiodination of α,β-Unsaturated Ketone and Ester Using Iodine-Cerium(IV) Ammonium Nitrate
Authors: Horiuchi C Akira , Ochiai Keiko , Fukunishi Hirotada 
Published: March 2006

Abstract
Reaction of α,β-unsaturated ketones and electron-deficent unsaturated esters with iodine-cerium(IV) ammonium nitrate in alcohols (methanol, ethanol, or 1-propanol) under 0 °C-reflux gave the corresponding β-alkoxy-α-iodoketones and esters in good yields. In the case of acetonitrile and acetonitrile-water, β-nitrato- and β-hydroxy-α-iodo compounds were obtained, respectively.
The Effect of Substitution of 3-Perylenyl Group, an Aromatic Nucleus with a Very Low Triplet Energy, on Photochemical Isomerization of the Unsaturated Bond. Direct Observation of Triplet State Isomerization of a Styrene Derivative
Authors: Arai Tatsuo , Takahashi Osamu , Asano Tomoyuki , Tokumaru Katsumi 
Published: March 2006

Abstract
3-Styrylperylene undergoes one-way cis → trans photoisomerization in the triplet state through a quantum chain process. The conversion of cis to trans triplet state was directly observed by laser spectroscopy to proceed with an activation energy of 6.6 kcal mol−1. This finding clearly demonstrates that in the series of styrylarenes, ArCH=CHPh, lowering of the triplet excitation energy of Ar group alters the mode of isomerization from two-way to one-way.
Activated Basic Alumina Promotes a Mild, Clean and High-Yield Racemization-Free Synthesis of t-Butyl Esters from Chiral Acid Bromides and t-Butyl Alcohol
Authors: Nagasawa Kazuo , Ohhashi Keiko , Yamashita Asami , Ito Keiichi 
Published: March 2006

Abstract
Esterification of a variety of acid bromides having even steric bulkiness with t-BuOH/activated basic alumina gave the corresponding t-butyl esters in good to excellent yields. In the case of chiral acid bromides, no racemization has been ascertained for the first time.
Construction of Chiral 2-Functionalized Piperidine via Enzymatic Resolution and Palladium-catalyzed N-Alkylation
Authors: Hirai Yoshiro , Nagatsu Mayumi 
Published: March 2006

Abstract
The palladium-catalyzed cyclization of the optically active urethan [(−)-1], which was obtained by enzymatic resolution of the racemic alcohol (1), gave the piperidine 6. This reaction affords highly efficient intramolecular chirality transfer. Compound 6 was converted into (+)-coniine and 2-hydroxymethylpiperidine.
A Novel Chiral Catalyst System, Tin(II) Triflate, a Chiral Diamine, and Tin(II) Oxide, in Asymmetric Aldol Reactions
Authors: Kobayashi Shu , Kawasuji Takashi , Mori Nobuaki 
Published: March 2006

Abstract
In the presence of a novel chiral catalyst system consisting of tin(II) triflate, a chiral diamine, and tin(II) oxide, highly enantioselective aldol reactions of the silyl enol ether of S-ethyl ethanethioate or S-ethyl propanethioate with aldehydes proceeded smoothly to afford the aldol adducts in high yields.
Asymmetric Oxidation of 1,9-Bis(methylthio)dibenzothiophene and First Determination of Optically Active l-Menthoxy Sulfonium Salt by X-Ray Crystallographic Analysis
Authors: Kimura Takeshi , Nakayama Hidetaka , Furukawa Naomichi 
Published: March 2006

Abstract
l-Menthoxy sulfonium salt of 1,9-bis(methylthio)dibenzothiophene was isolated, and the structure was first determined by X-ray crystallographic analysis.
Thermal Stability and Specific Dye Binding of a Hydrogen-Bond-Mediated Bilayer Membrane
Authors: Kimizuka Nobuo , Kawasaki Takayoshi , Kunitake Toyoki 
Published: March 2006

Abstract
A novel aqueous bilayer membrane that is formed from amphiphilic complexes of complementary hydrogen bond pairs provided a specific dye binding site similar to that of the conventional ammonium bilayer. Partial dissociation of the hydrogen bond pairs and the consequent component separation occurred by heating the aqueous bilayer to 80–100 °C.
Highly-selective Li+ Transport through Liquid Membranes with Oligomethylene-bridged Bisphenanthroline Derivatives
Authors: Sugihara Hideki , Collin Jean-Paul , Hiratani Kazuhisa 
Published: March 2006

Abstract
Newly prepared oligomethylene-bridged bisphenanthrolines have been found to transport lithium ion with excellent selectivity among alkali metal ions through chloroform liquid membrane.
Diastereoselective Control of Aggregation of 31-Epimeric Zinc Methyl Bacteriopheophorbides-d in Apolar Solvents
Authors: Tamiaki Hitoshi , Takeuchi Shoichiro , Tanikaga Rikuhei , Balaban Silviu T , Holzwarth Alfred R , Schaffner Kurt 
Published: March 2006

Abstract
Visible absorption spectra of the in-vitro oligomers of the 31-epimeric zinc methyl bacteriopheophorbides-d are different in apolar organic solvents. This indicates structural differences between these oligomers which are controlled by the configuration of the 1-hydroxyethyl group at C-3.
Poly(sulfonium cation) for Synthesis of High Molecular Weight Poly(phenylene sulfide)
Authors: Shouji Eiichi , Nishimura Shinji , Yamamoto Kimihisa , Tsuchida Eishun 
Published: March 2006

Abstract
Solution viscosity of Poly(methyl 4-phenylthiophenylsulfonium trifluoromethanesulfonate) as a novel polycation was measured in aqueous acetonitrile solution and formic acid. In the presence of sodium trifluoromethanesulfonate as supporting electrolyte, K and α values are determined to be K = 7.46 × 10−7 and α = 1.30 of Mark–Houwink equation in formic acid, in which the molecular weight of the poly(sulfonium cation) is estimated from that of poly(phenylene sulfide).
s-cis-(Z,Z) Structure of 1,2-Bis(2-pyridyl)ethylene Dianion in Solution
Authors: Yokoyama Yukihiro , Kikuchi Osamu , Koizumi Terutake , Takahashi Kensuke 
Published: March 2006

Abstract
The 1H, 7Li and 13C NMR spectra have been observed for the dilithium salt of 1,2-bis(2-pyridyl)ethylene in solution. The dianion in solution exists only one species with fixed s-cis-(Z,Z) configuration in contrast to stilbene dianion.