bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanism of “Living” Radical Polymerization Mediated by Stable Nitroxyl Radicals
Authors: Fukuda Takeshi , Terauchi Tomoya
Published: March 2006

It is shown that in order for the “living” radical polymerization mediated by stable nitroxyl radical (SNR) to proceed successfully, a constant supply of initiating radicals (by, e.g., thermal initiation) to make up for the loss of polymer radicals due to irreversible bimolecular termination is essential in addition to the frequent reversible combination of polymer radical with SNR. The stationary rate of SNR-mediated polymerization is totally independent of the SNR concentration, being equal to the polymerization rate of the SNR-free system. Experimental evidence is presented showing that in the “living” polymerization of styrene, both of these requirements are met in fact.
Synthesis and Absolute Configuration of Optically Active Telluronium Salts
Authors: Shimizu Toshio , Urakubo Tomonari , Kamigata Nobumasa
Published: March 2006

Enantiomerically pure ethylmethylphenyltelluronium salts were isolated by optical resolution from a diastereomeric mixture of ethylmethylphenyltelluronium (1S)-(+)-camphor-10-sulfonate and subsequent anion exchange reactions, and the absolute configurations were determined based on the X-ray crystallographic analysis of a diastereomeric isomer.
Observation of Relative Population Change in the 3P0 and 3P2 States for Ar Glow Discharge Formation
Authors: Imura Kohei , Midorikawa Ryotarou , Kasai Toshio , Ohoyama Hiroshi , Che Dock-Chil
Published: March 2006

The formation ratio of the two spin-orbit states, 3P0 / 3P2, of the metastable argon, Ar*, was investigated by the glow discharge of a pulsed Ar supersonic beam. The 3P0 / 3P2 ratio decreased with the increase of the glow discharge potential Vg, by which the electron bombardment initiates the discharge. The observed Vg-dependence clearly showed an inverse behavior against Vg as compared with that in the conventional electron impact by low beam densities.
A Fluorescent Molecule-Recognition Sensor with a Protein as an Environmental Factor
Authors: Wang Juan , Nakamura Asao , Hamasaki Keita , Ikeda Hiroshi , Ikeda Tsukasa , Ueno Akihiko
Published: March 2006

Modified cyclodextrin (1), which has p-N,N-dimethylaminobenzoyl and biotin units as a fluorophore and a protein-binding site, respectively, exhibits promoted sensing ability for various organic compounds in aqueous solution in the presence of avidin.
Energy-Transfer Luminescence of Eu3+ and Tb3+ Complexed with Hexakis(4-carboxylatophenoxy)cyclotriphosphazene
Authors: Itaya Tomoyuki , Sasaki Yutaka , Tanigaki Teiichi , Matsumoto Akira , Inoue Kenzo
Published: March 2006

Hexakis(4-carboxylatophenoxy)cyclotriphosphazene, 1, forms a stable 1:2 1 - lanthanide ion (Eu3+ and Tb3+) complex. The fluorescence behavior and structure of the complexes have been discussed.
Regulations for the Product Distribution of the Oxidative Coupling of p-Cresol by Cyclodextrins
Authors: Asakura Kouichi , Watanabe Tomoya , Honda Eitoshi , Osanai Shuichi
Published: March 2006

The oxidative coupling of p-cresol in the aqueous solution was carried out in the presence of cyclodextrins. The production of the dimeric compound was preferentially prevented by α-cyclodextrin, while the trimerization was efficiently inhibited by γ-cyclodextrin. The different effects of these two cyclodextrins were explained by their different inclusion complex forming ability which depended on their cavity size.
Cathodic Coupling of Ketones with Ethoxyvinylsilanes. Useful Method for the Synthesis of 1,3-Diols
Authors: Kashimura Shigenori , Ishifune Manabu , Murai Yoshihiro , Shono Tatsuya
Published: March 2006

Cathodic coupling of ketones with ethoxydimethylvinylsilanes takes place regioselectively at the position β to ethoxydimethylsilyl group and affords 1-oxa-2-silacyclopentane derivatives as products which are easily transformed to 1,3-diols by oxidative desilylation.
Synthesis and Binding Property of Tunable Upper-Rim Calix[4]crowns
Authors: Paek Kyungsoo , Ihm Hyejae
Published: March 2006

Conformationally stable, tunable upper-rim calix[4]crowns 3 ∼ 7 were synthesized in good yields from dibromodihydroxycalix[4]arene hexyl ether 1 and the picrate extraction experiment showed their higher affinities for primary ammonium ions compared to those for alkali metal cations.
Photochromic Reaction of Spirobenzoselenazopyrans with Long-chains in Monolayers on Water Surface
Authors: Hama Hiroshi , Miyashita Akira , Yamaoka Kiyomi , Nakahara Hiroo
Published: March 2006

For long-chain derivatives of spirobenzoselenazopyran the photochromic reactions in monolayers on water surface have been investigated and effects of the molecular packing upon the reaction were clarified in comparison with the reactivities at different surface pressures as well as those in the solution.
Liquid Ionization Mass Spectrometry for Studies on Reactions between Formaldehyde Oligomers in Aqueous Solution and Alcohols
Authors: Saito Jun , Kaneko Takeo , Yang Peiming , Niwa Yoshio , Tsuchiya Masahiko
Published: March 2006

Reactions between poly(oxymethylene)glycol (POMG) in aqueous solution and methanol or ethanol were studied by liquid ionization mass spectrometry. Hemiformalization of POMG occurred soon after methanol addition to form monomethylethers of POMG and completed within 15 min. While hemiformalization by ethanol addition occurred slowly and it took time, about 30 min, before producing monoethylethers of POMG.
Stereocontrol by Lewis Acids in the Hetero-Diels-Alder Reaction Leading to a Key 1β-Methylcarbapenem Intermediate
Authors: Nishiuchi Masaki , Honda Keisuke , Nakai Takeshi
Published: March 2006

The Lewis acid-promoted versions of the cycloaddition reaction between methyl 2-(benzoylamino)methylene-3-oxobutanoate and methylketene diethyl acetal are shown to provide a 1β-methylcarbapenem intermediate with high diastereoselectivity and moderate enantioselectivity.
Catalytic Activity of Perovskite-type La0.8Sr0.2M1−2yCuyRuyO3 (M = Al, Mn, Fe, Co) for CO Oxidation and NO–CO Reactions. Influence of the Simultaneous Substitution of Cu and Ru
Authors: Teraoka Yasutake , Nii Hiroshi , Kagawa Shuichi , Jansson Kjell , Nygren Mats
Published: March 2006

The catalytic activity of perovskite-type La0.8Sr0.2M1−2yCuyRuyO3 (M = Al, Mn, Fe, Co) for CO Oxidation and NO–CO reactions was changed significantly by the simultaneous substitution of Cu and Ru for M at the B sites, and its effect was dependent on host M cations. The simultaneous Cu/Ru substitution into the inert host of La0.8Sr0.2AlO3 gave a very active catalyst at a substitution level (y-value) of 0.1.
The Intermediates in the Low-Temperature Photolysis of Bis(diazo)cyclohexatetraone in an Argon Matrix
Authors: Ohana Tsuguyori , Yabe Akira
Published: March 2006

The photolysis of bis(diazo)cyclohexanetetraone (1) was investigated in an argon matrix at 17 K. Two intermediates were formed by a consecutive decomposition of two diazo groups of 1, which were identified by UV-vis and IR spectroscopies.
Preparation of Finely Dispersed-Palladium Metal in Zeolite by High Frequency-Ultrasonic Irradiation
Authors: Tanabe Shuji , Matsumoto Hiroshige , Mizushima Takanori , Okitsu Kenji , Maeda Yasuaki
Published: March 2006

New technique to prepare finely dispersed metallic species in a zeolitic framework has been developed by a high frequency-ultrasonic (HFUS) irradiation. The parent Pd ions in the zeolite were reduced with isopropyl alcohol into carbon containing Pd metal during the irradiation. These species was observed by EXAFS analysis to be highly dispersed into small clusters consisted of less than several atoms in zeolitic crystal.
Three-fold Interpenetrating Diamondoid Frameworks with π–π Stacking of Alternate Coordinated and Uncoordinated Ligands: Crystal Structures of Copper(I) Coordination Compounds, [Cu(DMTPN)2]X(DMTPN)(thf) (DMTPN = 2,5-Dimethylterephthalonitrile; X = BF4,ClO4)
Authors: Kuroda-Sowa Takayoshi , Yamamoto Mikiko , Munakata Megumu , Seto Makiko , Maekawa Masahiko
Published: March 2006

Two novel coordination polymer compounds, [Cu(DMTPN)2]X(DMTPN)(thf) (DMTPN = 2,5-dimethylterephthalonitrile, X = BF4 (l) and ClO4 (2)) are prepared and characterized by single crystal X-ray analysis; both are isostructural and have three-fold interpenetrated diamondoid structure with π–π stacking column of alternate coordinated and uncoordinated DMTPN.
CH/π Interaction in Linkage Isomers of Bis(2,2′-bipyridine)ruthenium(II) Complexes with Pyrimidine-2-thione and Related Ligands
Authors: Yamanari Kazuaki , Nozaki Tsuyoshi , Fuyuhiro Akira , Kaizaki Sumio
Published: March 2006

Ruthenium(II) complexes containing nine pyrimidine-2-thione [Ru(L-N,S)(bpy)2]+ (HL = pyrimidine-2-thione; bpy = 2,2′-bipyridine) are prepared and characterized. Two linkage isomers exist for most of the complexes with unsymmetrical ligands. The isomeric ratios are interpreted by CH/π attractive interaction between the 4- or 6-alkyl group of the thione ligands and the π-system of bpy.
Crystal Structure of 9-(Hexadecyl)imino-4,5-diazafluorene
Authors: Tang Ruikang , Qian Xiangping , Tai Zihou , Gu Jianming
Published: March 2006

The molecular and crystal structures of a new bilayer-forming amphiphilic ligand containing π-conjugated diazafluorenone Schiff base as the head group, 9-(hexadecyl)imino-4,5-diazafluorene (C27H39N3), were determined by the X-ray diffraction method.
Photochromic Properties of Thermally Irreversible 6-Aryloxy-5,12-naphthacenequinones
Authors: Yokoyama Yasushi , Fukui Shin-ya , Yokoyama Yayoi
Published: March 2006

Spectroscopic and photochromic properties of five 6-(4-substituted)phenoxy-5,12-naphthacenequinones were studied. The quantum yields of fading with the visible light were first reported. The electron-donating substituents on the phenyl ring decreased the fading quantum yields of both UV- and visible-light irradiation. Absorption spectra were merely influenced by the substituents.
Isolation and Characterization of Zirconacyclopentane
Authors: Takahashi Tamotsu , Fischer Reinald , Xi Zhenfeng , Nakajima Kiyohiko
Published: March 2006

Zirconacyclopentane (t-Bu2C5H3)2Zr(C4H8) was isolated as stable yellow crystals and its structure was determined by X-ray analysis.
Chiral NADH Models in the Pyrido[3,2-c]azepin Series. Conformational Effect of the Carbonyl Group in the Stereocontrol of Reductions
Authors: Bédat Joëlle , Levacher Vincent , Dupas Georges , Quéguiner Guy , Bourguignon Jean
Published: March 2006

Asymmetric reduction of methyl benzoylformate with the chiral NADH model 2 in the pyrido[3,2-c]azepin series afforded methyl mandelate in 91% optical yield. The high enantioselectivity observed with model 2 is compared with cyclized analogues 1a and 1b in the naphthyridine and pyrrolo[3,4-b]pyridine series respectively. The stereochimical outcome of the reaction is discussed in relation to the out-of-plane orientation of the amide group with respect to the dihydropyridine ring in the transition state.
Synthesis and Structural Determination of 1,1′-Spirobi(3H-2,1-benzoxatellurole)-3-one ([10-Te-4(C2O2)]): Conversion of Diacyloxyspirotellurane to Alkoxyspirotellurane by Reduction with Lithium Aluminium Hydride
Authors: Takaguchi Yutaka , Furukawa Naomichi
Published: March 2006

Selective reduction of the diacyloxyspirotellurane 1 with lithium aluminium hydride gave the acyloxyalkoxyspirotellurane 2 and dialkoxyspirotellurane 3, respectively. The X-ray crystal structure analysis of 2 (R = 0.020) reveals distorted trigonal-bipyramidal geometry about tellurium, similar to structures previously determined for other spirotelluranes.
Synthesis of 2,3-Disubstituted 6-Aminoquinoxalines and Their Application to New Fluorescence Derivatization Reagents for Carboxylic Acids
Authors: Katoh Akira , Takahashi Motoki , Ohkanda Junko
Published: March 2006

Fluorescent 2,3-disubstituted 6-aminoquinoxalines were synthesized by reaction of 2,3-dichloro-6-nitroquinoxaline with some nucleophiles and subsequent catalytic hydrogenation of the nitro group. Further, two of them were demonstrated to be new high-sensitive fluorescence derivatization reagents (1 fmol/1 μl injection volume) for long-chain carboxylic acids.
NQR, NMR, and DSC Study of [NH3(CH2)3NH3]CdBr4
Authors: Ishihara Hideta , Horiuchi Keizo , Yamada Koji , Okuda Tsutomu , Krishnan V G , Weiss Alarich
Published: March 2006

The 79,81Br nuclear quadrupole resonance(NQR) of [NH3(CH2)3NH3]CdBr4 was observed. The results of the temperature dependence of NQR frequencies and differential scanning calorimetry(DSC) showed that phase transitions take place successively at 328, 363, and 495 K. The results of 2D NMR of [ND3(CH2)3ND3]CdBr4 showed that the cations execute the jumping reorientation about their long axes above the transition point of 328 K.
New Synthesis and Crystal Structures of Platinum(II) l-Ascorbate Complexes
Authors: Yuge Hidetaka , Miyamoto T Ken
Published: March 2006

The reaction of cis-[PtII(OH)2L2] [L2: chelating diamines or (PMe3)2] with l-ascorbic acid (H2asc) in an aqueous solution produces a new platinum(II) ascorbate complex, cis-[PtL2(asc)], whose structure determination reveals the ascorbate ligand coordinates to Pt through O2 and O3 atoms as the first example. 1H NMR results show that the steric relation between the ascorbate and the other ligand L dominates whether or not the O2,O3-chelate is rearranged to the C2,O5-chelate.
Pt-B Catalyst Supported on Phosphates for Controlling Emissions of NOx, CO and Hydrocarbon at Low Temperatures
Authors: Hatano Masaharu , Kinoshita Hiroo
Published: March 2006

The performances of B-containing Pt catalysts supported on phosphates as an emission control catalyst were investigated for the reaction in an oxidizing atmosphere. Among them, rare earth phosphate supports showed not only the highest NO reduction activity, but also the highest CO and C3H6 oxidation activity at lower temperatures.
A Novel Oxidative Decarboxylation of α-Substituted α-Hydroxy Acids by a Functionalized Oxidation-active Flavin Mimic in the Presence of a Metal Ion in t-Butyl Alcohol
Authors: Ando Nobuyuki , Osawa Yohichi , Nabeshima Tatsuya , Yano Yumihiko
Published: March 2006

A benzo-dipteridine bearing a bipyridin-6-ylmethyl moiety (6-bpy-BDPox) was found to conduct oxidative decarboxylation of α-methyl mandelic and benzylic acids to give acetophenone and benzophenone and the reduced form (6-bpy-BDPred) in the presence of Ni2+ and DBU in t-BuOH.
Preparation and Characterization of Different Two Types of Di-μ-oxo Dimanganese(IV) Complexes with Tetradentate Schiff Bases
Authors: Torayama Hitoshi , Nishide Tamao , Asada Hideyuki , Fujiwara Manabu , Matsushita Takayuki
Published: March 2006

Novel di-μ-oxo dimanganese(IV) complexes with Schiff base ligands, N,N′-disalicylidene-1,2-diaminobenzene, salophenH2 and N,N′-disalicylidene-1,4-diaminobutane, salbnH2, [MnIV(salophen)(μ-O)]2 and [MnIV(salbn)(μ-O)]2 have been prepared and characterized by spectroscopies, magnetic susceptibilities and X-ray crystallography.
Anionic [1,3] Sigmatropic Rearrangements of an Oxy-Cope System Incorporated in 8-Methylenebicyclo[3.2.1]oct-6-ene and Related Frameworks
Authors: Uyehara Tadao , Inayama Toshihiro , Ueno Masako , Sato Toshio
Published: March 2006

Treatment of an 8-methylene-endo-2-vinylbicyclo[3.2.1]oct-6-en-exo-2-ol with KH in THF gave mainly a [5-6] fused-ring compound via [1,3] sigmatropy with retention of the configuration in the migrating group.
New Electrochemical Oscillations in Reduction Reactions on a Platinum Electrode in Hydrogen Peroxide Containing Sulfuric Acid Solutions
Authors: Hommura Hayato , Mukouyama Yoshiharu , Matsuda Toshihiko , Yae Shinji , Nakato Yoshihiro
Published: March 2006

A new pronounced electrochemical oscillation is found in the potential region of hydrogen evolution on a platinum electrode in a sulfuric acid solution containing high-concentration hydrogen peroxide. A mechanism is discussed, and it is shown that this oscillation is considerably different in origin from that reported in low hydrogen peroxide concentrations.
Stabilization of the Ferroelectric γ-Phase of KNO3 by Doping with Na+, Determined by the Acoustic Emission Method
Authors: Shimada Shiro , Aoki Takenori
Published: March 2006

A stabilized region of the ferroelectric γ-phase of KNO3 doped with Na+ ions was detected by simultaneous acoustic emission (AE)-differential thermal analysis (DTA). The γ to α phase transition in KNO3 was affected by doping with Na+, which lowered the onset temperature from 60 °C in the pure samples to 38 and 42 °C for 0.5 and 1 mol% doped samples, respectively. At 5 mol% Na+, the γ phase was stabilized at room temperature (25 °C). The AE results were confirmed by high-temperature X-ray diffraction.
Cycloaddition of Dipolar Trimethylenemethane to C70 Promoted by a Trace Amount of Water
Authors: Yamago Shigeru , Nakamura Eiichi
Published: March 2006

Thermal cycloaddition of a dipolar TMM to C70 at 80–90 °C in a “wet” solvent affords a mixture of the acetal 2 and the C70-carboxylic acid ester 3. The former (as well as its C60 analog) undergoes isomerization to the latter at 120-160 °C.
A Free-Radical Mechanism in a Novel Metalloporphyrin-Catalyzed Oxidation of Phenols by t-BuOOH
Authors: Brovo Anna , Fontana Francesca , Minisci Francesco
Published: March 2006

Metalloporphyrins, a chemical model of cytochrome P450, catalyze the oxidation of phenols with the para-position free to the corresponding p-quinones. Evidences of a free-radical mechanism are reported, including the results obtained with p-cresol.
Organopalladium and Platinum Complexes of C60 Bearing Isonitrile Ligands
Authors: Nagashima Hideo , Nakazawa Mitsuhiko , Furukawa Takeshi , Itoh Kenji
Published: March 2006

Organopalladium or platinum complexes, (η2-C60)M(CNR)2 (1 M = Pt, 3; M = Pd: R = tBu, 2,6-Me2C6H3, 2,4,6-Me3C6H2, cyclohexyl) were synthesized from C60Mn (M = Pd, Pt; n = ca.1) and the corresponding isonitriles. Unprecedented reaction of 1 with additional isonitriles occurred to form (η2-C60)Pt(CNR)4 (2) in the case where R = 2,6-Me2C6H3, 2,4,6-Me3C6H2, cyclohexyl).
Trichlorosilane-Dimethylformamide (Cl3SiH-DMF) as an Efficient Reducing Agent. Reduction of Aldehydes and Imines and Reductive Amination of Aldehydes under Mild Conditions Using Hypervalent Hydridosilicates
Authors: Kobayashi Shu , Yasuda Masaru , Hachiya Iwao
Published: March 2006

Trichlorosilane-dimethylformamide (Cl3SiH-DMF) was found to be an effective reducing agent for reduction of aldehydes to alcohols, imines to amines, and also reductive amination of aldehydes. Hypervalent silicates are active species, which enable efficient reduction under mild conditions.
Separation of Cd3(PO4)2, Cd(NO3)2 and CdCl2 by Sequential Metal Vapor Elution Analysis
Authors: Ohta Kiyohisa , Kawai Hajime , Mizuno Takayuki
Published: March 2006

The separation of cadmium compounds, (Cd3(PO4)2, Cd(NO3)2 and CdCl2), by sequential metal vapor elution analysis (column temperature; >1050 K) with helium carrier gas is described. The column consists of a molybdenum capillary tube inserted tungsten coil. Each cadmium vapor was separated at a column temperature of 1050 K and an vaporization temperature of 1050 K. Under the experimental conditions, the retention times of Cd3(PO4)2, Cd(NO3)2 and CdCl2 were 20.4, 32.0 and 35.0 s, respectively. The relative standard deviation for the retention times was better than 2.5%.
17O-NMR Evidence on the Isolated Water Molecule in Hydrophobic Organic Solvents
Authors: Kusanagi Hiroshi
Published: March 2006

17O-NMR spectra of H217O molecules in benzene, chloroform, ethylacetate, dimethylformamide, and 1-butanol were measured. For hydrophobic benzene and chloroform, the 17O-NMR spectra give two peaks consisting of the triplet and singlet lines, which are assingned to the isolated monomeric and clustered water molecules, respectively. The observed triplet splitting due to the spin - spin coupling of J17O-H gives an evidence that the isolated water molecule can not exchange the protons between water molecules seperated far away during the measurement time of NMR phenomenon.
Preparation of Poly(diphenylamine-4,4′-diyl) and a Related Polymer by Organometallic Polycondensation and Their Properties
Authors: Yamamoto Takakazu , Kim Sang-Bum , Maruyama Tsukasa
Published: March 2006

Nickel-promoted dehalogenation polymerization of bis(4-bromophenyl)amine gives poly(diphenylamine-4,4′-diyl) with a [η] value of 0.66 dLg−1 in high yield. The polymer has been characterized by IR, 1H-NMR and UV-visible spectroscopy and shows semiconductivity when treated with acids. Poly(azobenzene-4,4′-diyl) has been prepared in an analogous way.
Modification of Kemp’s Triacid to Produce New Ligands Showing Efficient Alkaline Earth Metal Ion Transport with Structure Dependent Selectivity
Authors: Baldwin Bruce W , Hirose Takuji , Wang Zhen-He , Uchimaru Tadafumi , Yliniemelä Ari
Published: March 2006

The calcium/barium selectivity ratio for efficient competitive transport among alkaline earth metal ions was controlled by structural isomerism and side chain linker changes in new lipophilic mono-substituted Kemp’s diacid ionophores.
Time-Resolved Emission Anisotropic Studies of Silylene-Diphenylene Copolymers: Energy Migration along the σ–π Conjugated Chain
Authors: Fang Mao-Ching , Watanabe Akira , Ito Osamu , Matsuda Minoru
Published: March 2006

The excited-state dynamics of silylene-diphenylene copolyemers, –[(SiMe2)m–(C6H4)2]n–, m = 1, 2, 3, 4, and 6, was studied by picosecond time-resolved emission anisotropy. The emission depolarization within 100 ps suggested the effective energy migration along the σ–π conjugated silylene-diphenylene chain.
Control of the Redox Behavior of Polypyrrole by Magneto-Electropolymerization
Authors: Mogi Iwao
Published: March 2006

The redox behavior was investigated of a p-toluenesulfonate-doped polypyrrole (PPy/TsO−) film electrochemically polymerized in magnetic fields. It was found that the magnetic fields higher than 1 T drastically changes the redox potential into the more negative side. The redox behavior was also controlled by the hybridization of the PPy/TsO− films polymerized with and without magnetic field.
Synthesis of Thieno[3,4-c]thiophene Derivatives Bearing tert-Butylthio and Aryl Substituents
Authors: Matsumura Noboru , Yagyu Yoshio , Tanaka Hirokazu , Inoue Hiroo , Takada Kiwamu , Yasui Masanori , Iwasaki Fujiko
Published: March 2006

1 ,4-Bis(tert-butylthio)-3, 6-diphenylthieno[3, 4-c]thiophene (2a) and 1,4-bis(tert-butylthio)-3,6-di(2-thienyl)thieno[3,4-c]thiophene (2b) were synthesized from 2-tert-butylthio-3-phenylcyclopropenethione (1a) and 2-tert-butylthio-3-(2-thienyl)cyclopropenethione (1b), respectively, by treatment with triphenylphosphine in benzene.
Synthesis, Conformation, and Reactivity of Ethylene-Bridged [2.2.1]Metacyclophanes
Authors: Tsuge Akihiko , Takeo Hiromi , Kabashima Hajime , Moriguchi Tetsuji , Mataka Shuntaro , Tashiro Masashi
Published: March 2006

A series of ethylene-bridged [2.2.l]metacyclophanes has been synthesized. It was found out that they can adopt a new type of “inward-folded” conformation depending on the substituent of the one aromatic ring. This conformer exhibited different reactivities from another “inward-folded” one of the non-bridged [2.2.l]metacyclophanes.
Catalytic Performance of a Supramolecular Bienzyme Complex Formed with Artificial Aminotransferase and Natural Lactate Dehydrogenase
Authors: Kikuchi Jun-ichi , Kamijyo Yasuyuki , Etoh Hiroshi , Murakami Yukito
Published: March 2006

A supramolecular bienzyme complex was constituted in a combination of a catalytic bilayer membrane as an artificial aminotransferase with a natural lactate dehydrogenase and the resulting cooperative system enhanced the catalytic activity of the artificial enzyme to promote a sequential transformation of α-amino acids to the corresponding α-hydroxy acids via formation of α-keto acids, exhibiting a marked substrate specificity.
Titanium (IV) Oxide Thin Films Prepared from Aqueous Solution
Authors: Deki Shigehito , Aoi Yoshifumi , Hiroi Osamu , Kajinami Akihiko
Published: March 2006

Titanium oxide thin film could be prepared from (NH4)2TiF6 aqueous solution with addition of boric acid by Liquid Phase Deposition (LPD) process. The aspect and chemical composition of the deposited films were different according to the concentration range of (NH4)2TiF6 and H3BO3 in the treatment solution. The deposition rate of transparent TiO2 film increased with increasing concentration of added H3BO3.
Electrochemical Evaluation of Redox Enzyme Reaction Kinetics Based on Mediated Bioelectrocatalysis in Solution
Authors: Kano Kenji , Ohgaru Takanori , Nakase Hiroshi , Ikeda Tokuji
Published: March 2006

Approximate and more precise empirical equations have been derived for the steady state limiting currents of bioelectrocatalysis based on homogeneous enzyme and mediator at sufficiently high concentrations of the substrate. These equations allow us to evaluate the catalytic constant and the Michaelis constant of the mediator.
Absolute Stereochemistry of Tanabalin, an Insect Antifeedant Clerodane from Tanacetum balsamita
Authors: Kubo Isao , Jamalamadaka Vasu , Kamikawa Tadao , Takahashi Koichi , Tabata Kenji , Kusumi Takenori
Published: March 2006

The absolute structure of tanabalin (= 12S-acetoxyhautriwaic acid), an insect antifeedant isolated from Tanacetum balsamita, was determined by X-ray crystallography together with modified Mosher’s method, in which an anomalous Δδ value of a proton was verified with an l-adrenaline derivative as a model compound.
Ab initio Study of the C6-C7 Conformation of Retinal Model Systems
Authors: Terstegen Frank , Buss Volker
Published: March 2006

Ab initio calculations have been performed on model compounds of retinal and retinal derivatives, β-ionone, β-ionone Schiff base and protonated Schiff base and the corresponding hydrocarbon, to study the ring orientation as a function of the heteroatom and the state of protonation. Two 6-s-cis derived conformations are shown to exist in all four compounds. Stable close to planar 6-s-trans conformations were obtained for the protonated Schiff base and for the ketone only.
13C, 17O, and 29Si NMR Spectra and Stabilization of Silylated Ketenes and Bisketenes
Authors: Allen Annette D , Egle Ian , Janoschek Rudolf , Liu Hui Wen , Ma Jihai , Marra Romeo M , Tidwell Thomas T
Published: March 2006

The experimental and calculated 13C, 17O, and 29Si NMR chemical shifts of silylated ketenes and bisketenes show trends consistent with charge redistribution resulting from neutral hyperconjugative donation from the R3Si-C bond to the p orbital on the carbonyl carbon, and are supportive of this mechanism for the striking stability of these species.
Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Nitrile Oxides to an Achiral Allyl Alcohol Utilizing Diisopropyl Tartrate as a Chiral Auxiliary
Authors: Shimizu Makoto , Ukaji Yutaka , Inomata Katsuhiko
Published: March 2006

The catalytic asymmetric 1,3-dipolar cycloaddition of nitrile oxides to an achiral allyl alcohol was achieved by the use of a catalytic amount of diisopropyl (R,R)-tartrate as a chiral auxiliary to afford the corresponding (R)-2-isoxazolines with high enantioselectivity. In order to realize reproducible higher stereoselection, the addition of a small amount of ethereal compound such as 1,4-dioxane was crucial.
Interfacial Mass Transfer across a Single Microdroplet/Water Boundary. Laser Trapping and Generation-Collection Experiments at a Microelectrode Array
Authors: Nakatani Kiyoharu , Terui Norifumi , Hasebe Kiyoshi , Kitamura Noboru
Published: March 2006

Mass transfer of 1-hydroxyethylferrocenium cation from a nitrobenzene microdroplet to the surrounding water phase was directly measured by a generation-collection mode of a microelectrode array combined with a laser trapping technique. The mass transfer time of the derivative across the droplet/water interface was analyzed for the first time by a potential scan rate dependence of cyclic voltammograms.
Synthesis of a Donor-Stabilized Silyl(silylene)iron Complex. Direct Observation of 1,3-Methyl Migration from Silyl to Silylene Ligands
Authors: Ueno Keiji , Nakano Kaori , Ogino Hiroshi
Published: March 2006

Photolysis of Cp*Fe(CO)2SiMe2SiMe3 (Cp* = η-C5Me5) in the presence of HMPA (HMPA = (Me2N)3PO) afforded a donor-stabilized silyl(silylene)iron complex, Cp*(OC)Fe(=SiMe2·HMPA)SiMe3, almost quantitatively. Variable temperature 1H NMR investigation for solutions of the trimethylsilyl(dimethylsilylene)iron complex allowed the direct observation of 1,3-methyl migration from the silyl ligand to the silylene ligand. It is proposed that 1,3-migration may be a general phenomenon which prevails among compounds with RnE–M=E′Rm, arrangement.
Blue Electroluminescent 1,2,4-Triazole Derivative
Authors: Kido Junji , Kimura Masato , Nagai Katsutoshi
Published: March 2006

A blue fluorescent 1,2,4-triazole derivative, DA-TAZ, was synthesized and exmined as an emitter layer in organic electroluminescent device. The device structure of glass substrate / indium-tin oxide / hole-transporting diamine layer / DA-TAZ layer / Mg:Ag was employed. The EL device exhibited bright blue light originating from the DA-TAZ emitter layer with a maximum luminance of 1200 cd/m2 at 14 volt.
Synthesis and Structure of Novel Vanadium(III) Compounds Having a Cyclic Core
Authors: Kumagai Hitoshi , Kitagawa Susumu
Published: March 2006

Treatment of VCl3(thf)3 with dipyridylamine, sodium hydride and sodium acetate yields a novel cyclic octanuclear vanadium(III) complex; the X-ray structure analysis reveals a cyclic vanadium core. The vanadium ions are alternatively bridged by hydroxide, ethoxide and carboxylate.
Generation of Hydrido(silylene)iridium(I) Complex via [1,2] H Shift from the Silicon Atom to the Iridium(I) Metal Center
Authors: Okazaki Masaaki , Tobita Hiromi , Ogino Hiroshi
Published: March 2006

Thermolysis of alkyl-hydrido complexes, LnIr(R)(H) [Ln = {MesHSi(CH2)2PPh2}(PMe3)2, R = Me, Et], caused the reductive elimination of alkane to generate a 16e iridium(I) species LnIr (A). Intermediate A underwent the intramolecular C–H bond activation. Reactivity of A with MeOH revealed that A underwent a [1,2] H shift from the silicon atom to the iridium center to give hydrido(silylene) complex Ir(H){η2-MesSi(CH2)2PPh2}(PMe3)2 (B) reversibly.
Dimer Formation of Naphthalene in Langmuir-Blodgett Monolayer Films Probed by Time-Resolved Fluorescence Spectroscopy
Authors: Abe Kei , Suzuki Sachiko , Mukai Ikuo , Akimoto Seiji , Ohta Nobuhiro , Yamazaki Iwao
Published: March 2006

Naphthalene incorporated in LB monolayer films has been found to exhibit two types of fluorescence emissions due to the monomer and the dimer. The dimer fluorescence corresponds well to those observed in crystal under extraordinary high pressure and in naphthalene paracyclophanes.
Redox-Induced cis → trans Isomerisation of Bis(porphyrinyl)ethenes: A Possible Basis for a Molecular Memory Element?
Authors: Arnold Dennis P , Borovkov Victor V , Ponomarev Gelii V
Published: March 2006

trans-1,2-Bis(octaethylporphyrin-5-yl)ethene free base and its dinickel(II) complex exhibit narrow electrochemical band gaps (1.44 and 1.49 eV, respectively) and broad, solvent-dependent absorption bands at low energy, whilst the corresponding cis isomers undergo rapid redox-induced cis → trans isomerisation.
Trisbipyridine Metal Ion’s Nest in Three α-Helix Bundle Structure
Authors: Nishino Norikazu , Kato Tamaki , Murata Tomonori , Nakayama Hiroshi , Arai Toru , Fujimoto Tsutomu , Yamamoto Hitoshi , Yoshikawa Susumu
Published: March 2006

A trisbipyridine nest of a three-helix bundle structure has been built in a pseudoprotein containing 5-bipyridylalanine in each peptide segment. The accommodation of Ni2+ ion in the nest that is situated in the hydrophobic region is demonstrated by the measurements of electronic and circular dichroism spectra.
Preparation of an Electrically Heated Wire Catalyst for Cold-Start-Exhaust
Authors: Nanba Tetsuya , Takeishi Kaoru , Azuma Naoto , Morioka Yoshio , Ueno Akifumi
Published: March 2006

Three way catalysts were dispersed over the surface of an anodized Ti wire in order to promptly eliminate hydrocarbons remained in cold-start-exhaust gas from an automobile engine. The anodized wire was heated up to 623 K or higher in 30 sec simply to loading 13 V to the ends of the wire, which resulted is abatement of 50% hydrocarbons in the cold-start-exhausts within 30 sec just after an engine ignition.
Effect of Capillary Force on Friction Force Microscopy : A Scanning Hydrophilicity Microscope
Authors: Fujihira Masamichi , Aoki Daisuke , Okabe Yoh , Takano Hajime , Hokari Hirofumi , Frommer Jane , Nagatani Yasunori , Sakai Fumiki
Published: March 2006

The effect of capillary force due to surface water on friction force microscopy (FFM) was examined by comparing FFM images on oxidized Si surfaces partially covered with chemically bound hydrocarbon (HC) monolayers in vacuo and in an ambient atmosphere. It was found also from force-distance curves and FFM under various relative humidities that adhesive and friction forces observed on the hydrophobic HC covered surface were almost independent of the humidity, while those on the hydrophilic bare oxidized Si surface increased with an increase in the humidity. The higher friction observed on the oxidized Si in the higher humidity was interpreted by the higher effective normal load due to the higher capillary force which originated from a surface water film formed by adsorption of water vapor in the humid air. The results suggest a novel scanning hydrophilicity microscope under a controlled humidity which can be used to map local hydrophilicities of a sample surface in a x-y plane.
Efficient and Convenient Route to (Z)-α,β-Unsaturated Difluoromethyl Ketones Based on the Reaction of 2,3,3-Trifluoro-1-tosyloxy-1-propenyllithium with Carbonyl Compounds
Authors: Funabiki Kazumasa , Ohtsuki Tetsuya , Ishihara Takashi , Yamanaka Hiroki
Published: March 2006

2,3,3-Trifluoro-1-tosyloxy-1-propenyllithium, generated from 2,3,3-trifluoro-1-propenyl p-toluenesulfonate with butyl-lithium, underwent coupling reaction with various carbonyl compounds to give good yields of 3,4,4-trifluoro-2-tosyloxy-2-butenyl alcohols, whose treatment with concentrated sulfuric acid at room temperature afforded the corresponding (Z)-α,β-unsaturated difluoromethyl ketones in good yields.
Crystal and Molecular Structure of 5,5′-Bis[(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl)methyl]-2,2′-bithiophene
Authors: Muguruma Hitoshi , Hotta Shu , Karube Isao
Published: March 2006

5,5′-Bis[(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl)methyl]-2,2′-bithiophene crystallizes in the monoclinic system with space group P21⁄c. Because of the presence of the bulky terminal groups of 2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclo-pentyl, the compound shows unique crystallographic features compared with previously reported bithiophene and its derivatives.
A Simple Construction of a Rotaxane and Pseudorotaxane: Syntheses and X-Ray Crystal Structures of Cucurbituril Threaded on Substituted Spermine
Authors: Jeon You-Moon , Whang Dongmok , Kim Jaheon , Kim Kimoon
Published: March 2006

A simple, one-step, high-yield synthesis of a rotaxane and pseudorotaxane based on cucurbituril and spermine is presented. Various spectroscopic techniques and X-ray diffraction methods were used to characterized the supramolecular species.
Evaluation of Novel Local Structural Parameters of Various Acids and Bases
Authors: Mishima Shozi , Nakajima Tsuyoshi , Fujii Tsuneo
Published: March 2006

Novel local structural parameters representing the nature of functional group and residual moiety of acids and bases were evaluated successfully from the formation constants of the 1:1 hydrogen-bond complexation in CCl4 reported in literatures.
Photothermal Dynamics at the Surface of Copper Phthalocyanine Solid Revealed by Time-resolved Regular Reflection Spectroscopy
Authors: Fukumura Hiroshi , Yoneda Yoshikazu , Takahashi Hitoki , Masuhara Hiroshi
Published: March 2006

Flat surfaces of compressed pellets made of copper phthalocyanine powders were excited by nanosecond laser pulses and their time-resolved extinction coefficients were obtained by using regular reflection spectroscopy independent of Kramers-Kronig transformation. The results showed transient depletion at the peaks of the ground state absorption spectra, which is due to a change in thermal population in vibrational states. The decay of the transient depletion was well described with the temperature dependency of extinction coefficient based on Sulzer-Wieland approximation and one-dimensional thermal diffusion towards the deep parts of the pellet samples.
Observation of Intermolecular Charge-Transfer Spectra for Propyl Viologen Dihalides in a Series of Polyether Media
Authors: Satoh Hideharu , Tokuda Koichi , Ohsaka Takeo
Published: March 2006

1,1-Dipropyl-4,4-bipyridinium diiodide(PV2+·2I−) in a series of polyethers (PEOs, HO-(-CH2CH2O-)n-H, n = 1∼14)1 gave an intermolecular charge-transfer spectrum, which shifted to longer wavelength with larger absorbance in less polar medium, in the visible region. An increase in temperature resulted in an increase in absorbance as a result of an ion-dipole interaction between PV2+ cation and polyether solvent.
Enantiomerically Pure 4-Methyl- and 1,4-Dimethyl-bicyclo[3.2.0]hept-3-en-6-ols and Ones by Microbial Redox
Authors: Fantin Giancarlo , Fogagnolo Marco , Marotta Emanuela , Medici Alessandro , Pedrini Paola , Righi Paolo
Published: March 2006

The reduction of bicyclo[3.2.0]hept-3-en-6-ones 1a,b with Baker’s yeast to a mixture of enantiomerically pure (6S)-endo- and (6S)-exo-alcohols 2a,b and 3a,b respectively is described. Furthermore the oxidation of the racemic endo-alcohols 2a,b with Bacillus stearothermophilus afforded the corresponding ketones with high enantiomeric excesses resolving the endo-enantiomer. In the same conditions the exo-alcohols 3a,b are not oxidized.
Conversion of Trifluoromethyl-Substituted π-Vinylcarbeneiron to Difluorotrimethylenemethane Complexes
Authors: Fujita Ken-ichi , Watanabe Yoshihisa , Mitsudo Take-aki
Published: March 2006

A trifluoromethyl-substituted π-vinylcarbeneiron complex reacts with [KB(sec-Bu)3H] or phenyllithium to afford difluorinated trimethylenemethane iron complexes. This is the first example of the conversion of a π-vinylcarbeneiron complex to a trimethylenemethane complex.
Spectroscopic Study on Ion-Ion Recombination and Neutralization Reactions of Kr+ with C6F6− and SF6− in the Flowing Afterglow
Authors: Tsuji Masaharu , Ishimi Hiroaki , Nishimura Yukio
Published: March 2006

The positive ion-negative ion reactions of Kr+(2P1⁄2,3⁄2) with C6F6− and SF6− have been spectroscopically studied in the flowing afterglow. The recombination and neutralization reactions leading to KrF* excimers and Kr* atoms, respectively, were found to compete with each other. The relative formation ratio of KrF*/Kr* in the Kr+(2P1⁄2,3⁄2)/C6F6− reaction was much smaller than that in the Kr+(2P1⁄2,3⁄2)/SF6− reaction.
Effects of Cresol-Sulfonic Acid on Redox Behavior of Polyaniline
Authors: Tang Heqing , Kitani Akira , Yamashita Tomoyuki , Ota Yoshifumi , Shiotani Masaru
Published: March 2006

Polyaniline was possibly doped with cresol-sulfonic acid, though it failed to electrodeposit the polymer from solutions of aniline in cresol-sulfonic acid. The presence of cresol-sulfonate anions changed the redox peaks of the polymer in thier positions and heights. Catalytic oxidation of cresol-sulfonic acid was observed on polyaniline-filmed electrodes at potentials of a limited interval.
Blue Electroluminescence from Poly(p-phenylene) Solubilized by Perfluoropropylation
Authors: Hamaguchi Maki , Sawada Hideo , Kyokane Jun , Yoshino Katsumi
Published: March 2006

Perfluoropropylation of poly(p-phenylene) (PPP) was carried out with the intention of obtaining soluble PPP dervatives. The resulting polymers were chracterized by UV/vis and IR spectroscopy. An electroluminescent device emitting blue-green light depending on the bias voltage was fabricated from this polymer.
In situ Optical Second Harmonic Generation Study of Electrochemical Oxidation of Formaldehyde on a Polycrystalline Platinum Electrode
Authors: Yagi Ichizo , Nakabayashi Seiichiro , Uosaki Kohei
Published: March 2006

In situ optical second harmonic generation(SHG) technique was employed to investigate the electrochemical oxidation of formaldehyde on a polycrystalline Pt electrode. At 532 nm excitation, the SH signal generated at a Pt surface seems to be enhanced by the existence of adsorbed CO and can be related to the surface coverage of CO(a) which cannot be determined by the electrochemical methods. Thus, the potential dependence of the SH signal provides useful information to understand the mechanism of this reaction.
Control of the Dopant-Exchange Process in Polypyrrole by a Magnetic Field
Authors: Mogi Iwao
Published: March 2006

The effect of high magnetic fields on the dopant-exchange (DE) process in p-toluenesulfonate-doped polypyrrole (PPy/ TsO−) was investigated in a LiClO4 aqueous solution by means of cyclic voltammetry. It was found that the magnetic field accelerates the DE process in the PPy/TsO− film polymerized in the absence of magnetic field and that the DE process hardly proceed in the PPy/TsO− film polymerized in the magnetic field of 12 T.
Formation of Organic Pigment Films by Photochemical Reduction of Surfactants Containing an Azobenzene Group
Authors: Yamanouchi Hiroaki , Saji Tetsuo
Published: March 2006

A copper phthalocyanine 1 thin film and photoimage were formed on a polyester film by irradiation of an aqueous dispersion containing a surfactant with an azobenzene group 2a, dispersed 1, hydroquinone 3 and 0.1 M HCl. A spectroscopic study showed that the photochemical reduction of 2a with 3 leads to the deposition of 1.
Preparation and Palladium Complex Formation of Several (2-Phosphaethenyl)benzenes
Authors: Kawanami Hajime , Toyota Kozo , Yoshifuji Masaaki
Published: March 2006

Phenylphosphaethenes carrying two to four phosphoruscarbon double bonds on a benzene ring were prepared and their palladium complex formations were studied. The palladium complexes reacted with alkyllithium reagents to give the corresponding o-alkylation products.
A Selective Crystal Growth under a Monolayer
Authors: Tang Ruikang , Tai Zihou , Chao Yiqun
Published: March 2006

The crystallization are selective when the monolayer of 9-(hexadecyl)imino-4,5-diazafluorene was spread on the surface of the mixed supersaturated solution of CuSO4·5H2O and Na2SO4. In the experiment, CuSO4·5H2O and its (010) face are chosen to form under the monolayer; but the crystallization of Na2SO4 still occurs at the bottom of the solution.
Synthesis of Terphenylboronic Acid Derivatives and Recognition of Anomers of 2-Deoxyribofuranoside
Authors: Yamashita Hiroshi , Amano Koji , Shimada Satoru , Narasaka Koichi
Published: March 2006

A terphenylboronic acid 1 and its silylated derivative 2 are prepared from (2-nitrophenyl)acetic acid for the purpose of controlling stereochemistry of synthetic organic reactions. These boronic acids are found to recognize α and β-anomers of 2-deoxyribofuranosides. That is, when these boron compounds are added to a 1 : 1 mixture of α and β-t-butyl 5-O-benzyl-2-deoxy-d-ribofuranosides, the boronic acids 1 and 2 from the corresponding boronates preferentially with the β-anomer.
Stereoseletive Reduction of β-Hydroxy Ketones to 1,3-Diols with the Aid of a Terphenylboronic Acid
Authors: Yamashita Hiroshi , Narasaka Koichi
Published: March 2006

1-Hydroxy-6,8-diphenyl-1,2,3,4-tetrahydro-2-oxa-1-boranaphthalene (terphenylboronic acid 1), is employed for stereoselective reduction of acyclic and cyclic β-hydroxy ketones. The terphenylboronic acid 1 and acyclic β-hydroxy ketones 2 are converted to the corresponding boronates by azeotropic removal of water. The resulting boronates are treated in situ with reducing reagents to give syn 1,3-diols 3 almost exclusively. Anti  α-substituted β-hydroxy ketones 8 are also reduced to give anti, anti 1,3-diol 9 stereoselectively. Furthermore, the reduction of 3-hydroxy-1-cyclopentanone gives a cis diol 11 in high selectivity.
Remarkable Activity Enhancement of Pitch Based Active Carbon Fibers by Heat-treatment for Oxidative SO2 Removal
Authors: Mochida Isao , Kuroda Keiichi , Kawabuchi Yuji , Kawano Shizuo , Matsumura Yuji , Yoshikawa Masaaki
Published: March 2006

Oxidative capture and recovery of SO2 in form of H2SO4 was examined over pitch based active carbon fibers (P-ACF-OG-15A and -20-A). The fiber calcined at 1100 °C was found to exhibit a remarkable activity to remove completely 1000 ppm SO2 at a contact time of 1 × 10−3 g·min·ml−1 with 10% H2O at 30 °C. Hydrophobicity appears important to show such a high activity.
Aromatic Allylsulfenylation with in Situ Generated Allyl Thiols under the Heck Conditions
Authors: Harayama Hiroto , Kozera Toyohiro , Kimura Masanari , Tanaka Shuji , Tamaru Yoshinao
Published: March 2006

By the catalysis of palladium(0), S-allyl thiocarbamates 1 react with aryl iodides and vinyl bromides to give allyl aryl sulfides and allyl vinyl sulfides, respectively, in good yields.
Vacuum-Deposited Thin Film of Linear Oligosilane Me(SiMe2)12Me
Authors: Yatabe Tetsuo , Shimomura Masaki , Kaito Akira
Published: March 2006

Thin film of linear oligosilane, Me(SiMe2)12Me, was prepared by a vacuum-deposition method. In the film, the Si-backbones adopted all-trans conformation and highly oriented perpendicular to the substrate. The oligosilane film showed a sharp UV absorption at 285 nm attributed to the planar-zigzag form.
CVD Synthesis of Alumina-supported Molybdenum Carbide Catalyst
Authors: Miyao Toshihiro , Shishikura Isao , Matsuoka Masakuni , Nagai Masatoshi
Published: March 2006

The alumina-supported Mo carbide catalyst was synthesized using a chemical vapor deposition (CVD) technique. The CVD carbide exhibited an extremely high activity for the reduction of CO2, compared to the alumina-impregnated carbide. The XPS and XRD analyses showed the formation of Mo carbide on the alumina. The increase in the BET surface area of the CVD carbide with increasing Mo loading suggested that very fine particles of Mo carbide were formed on the alumina.
Oscillatory Behavior in Electrochemical Deposition Reaction of Polycrystalline Silicon Thin Films through Reduction of Silicon Tetrachloride in a Molten Salt Electrolyte
Authors: Matsuda Toshihiko , Nakamura Shinsuke , Ide Ken-ichiro , Nyudo Kazuiku , Yae Shinji , Nakato Yoshihiro
Published: March 2006

A new electrochemical oscillation is found for reduction reaction of silicon tetrachloride on a partially immersed single crystal n-Si electrode in a lithium chloride-potassium chloride eutectic melt electrolyte. The reduction of SiCl4, which is almost insoluble in the electrolyte, occurs mainly near the upper edge of an electrolyte meniscus on the electrode, and it is discussed that the oscillation is caused by a change in the height of the meniscus due to a change in the chemical structure (and hence the interfacial tension) of the electrode surface with progress of the silicon deposition reaction.
Computer Analyses of Complex Kinetics Containing Equilibrium Processes. Example of Application for Unusual Atropisomerization of a Tetraphenylporphyrin Derivative
Authors: Kuroda Yasuhisa , Kawashima Ayato , Ogoshi Hisanobu
Published: March 2006

Kinetic behavior of atropisomerization of tetraphenylporphyrin derivative containing equilibrium processes of dimer formation were analyzed directly by a non-linear least square optimization method which uses numerical integration of kinetic differential equations. Analyses clearly indicate a kinetic model determined with one rate and two equilibrium constants as the most plausible mechanism.
Molecular Size of an Anti-HIV Peptide, T22, Can Be Reduced without Loss of the Activity
Authors: Waki Michinori , Waki Koji , Miyamoto Kenji , Matsumoto Akiyoshi , Tamamura Hirokazu , Fujii Nobutaka , Murakami Tsutomu , Nakashima Hideki , Yamamoto Naoki
Published: March 2006

An 18-peptide, T22, has been shown to have a strong anti-human immunodeficiency virus (HIV) activity comparable to that of 3′-azido-3′-deoxy-thymidine (AZT). Several shortened analogs of T22 were designed, synthesized and evaluated of their anti-HIV activities. A 14-peptide analog with one disulfide bond, TW70 (des-Cys8,13, Tyr9,12-[d-Lys10, Pro11]-T22), showed comparable activity to that of T22, indicating that the molecular size of T22 could be reduced without loss of the activity.