bluuebunny/crossref_metadata_2025 huggingface dataset:
X-RAY ABSORPTION SPECTROSCOPY OF SILICA-SUPPORTED Ir–Ru BIMETALLIC CLUSTERS
Authors: Hamada Hideaki , Samant Mahesh G , Boudart Michel
Published: July 2006

X-Ray absorption spectroscopy (XAS) studies at the LIII absorption edge of Ir and the K absorption edge of Ru were conducted on silica-supported Ir–Ru samples. The samples were prepared by co-impregnation of silica with an aqueous solution of IrCl4 and RuCl3. The XAS data indicate segregation of an Ir–Ru alloy on the surface of the Ir particles. The LIII absorption threshold resonance associated with the Ir atom suggests that Ir in Ir/SiO2 and Ir–Ru/SiO2 is more electron deficient than bulk metallic Ir powder.
VISIBLE-LIGHT INDUCED WATER SPLITTING ON NEW SEMICONDUCTOR ELECTRODES MADE BY PHOTOLITHOGRAPHY
Authors: Hiramoto Masahiro , Hashimoto Kazuhito , Sakata Tadayoshi
Published: July 2006

By making use of a photolithography technique, mosaic coating composed of thick metal films and a transparent silicon oxide film was applied to the surface of the small bandgap semiconducting electrodes such as Si electrodes with a p-n junction (p+ n-Si) or an MIS junction (MIS-Si), n-CdS/p-CdTe heterojunction electrodes. These electrodes are stable and evolve oxygen efficiently with visible light in concentrated alkaline solutions.
SYNTHESIS OF ETHYLENE BY PARTIAL OXIDATION OF METHANE OVER THE OXIDES OF TRANSITION ELEMENTS WITH LiCl
Authors: Otsuka Kiyoshi , Liu Qin , Hatano Masaharu , Morikawa Akira
Published: July 2006

The synthesis of ethylene directly from methane has been tested in the presence of oxygen over the LiCl-added transition metal oxides. The oxides of Mn and Ni with LiCl produced ethylene with high selectivity (ca. 60%) and yield (ca. 27%) under the following experimental conditions: T=1023 K, P(CH4)/P(O2)=2/1, P(CH4)=5.1 kPa, and W/F=600–1200 g l−1s.
SELECTIVE AND STEREOSPECIFIC HORSE LIVER ALCOHOL DEHYDROGENASE-CATALYZED REDUCTION OF CAGE-SHAPED meso-DIKETONE. AN EFFICENT ACCESS TO OPTICALLY ACTIVE D3-TRISHOMOCUBANE DERIVATIVE
Authors: Naemura Koichiro , Fujii Takanori , Chikamatsu Hiroaki
Published: July 2006

Horse liver alcohol dehydrogenase-catalyzed reduction of meso-diketone: pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione gave (−)-11-hydroxypentacyclo[5.4.0.02,6.03,10.05,9]undecan-8-one which was transformed to (+)-D3-trishomocuban-4-ol. HLADH also catalyzed the reduction of (±)-pentacyclo[5.4.0.02,6.03,10.05,9]undecan-8-one (4) affording (+)-4 and (−)-pentacyclo[5.4.0.02,6.03,10.05,9]undecan-8-ol.
ASYMMETRIC TRANSCYANOHYDRINATION
Authors: Kobayashi Yoshiyuki , Hayashi Hiroaki , Miyaji Koji , Inoue Shohei
Published: July 2006

Transcyanohydrination, the reaction between an aldehyde and acetone cyanohydrin to give the cyanohydrin of the aldehyde, catalyzed by cyclo((S)-phenylalanyl-(S)-histidyl) gives the product with optical yield up to 63% from some aromatic and aliphatic aldehydes. The reaction catalyzed by (S)-α-dimethylamino-ε-caprolactam gives the product with optical yield of 15-25% from aliphatic aldehydes.
SYNTHESIS OF OPTICALLY ACTIVE DIAMINO-DIIMINE MACROCYCLE (6S,15S)-1,5,10,14-TETRAAZA-4,13-DIMETHYL-TRICYCLO[13.3.1.16,10]ICOSA-4,13-DIENE AND MOLECULAR STRUCTURE OF ITS NICKEL(II) COMPLEX
Authors: Miyamura Kazuo , Saburi Masahiko , Gohshi Yohichi , Tsuboyama Sei , Sakurai Toshio
Published: July 2006

An optically active tetra-aza macrocycle was prepared by a simple method, employing an optically active N-substituted diamine as a starting material, and the molecular structure of its nickel(II) complex was determined by an X-ray crystallographic analysis.
A NEW TRANSFORMATION METHOD OP N-ALKYLPHTHALIMIDES TO N-ALKYLFORMAMIDES WITH N,N-DIMETHYLFORMAMIDE AND HYDRAZINE HYDRATE
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi
Published: July 2006

N-Alkylphtalimides were transformed to N-alkylformamides, mediated by hydrazine hydrate in N,N-dimethylformamide, in practical synthetic yields.
“PARTIALLY” SUPERCONDUCTING BEHAVIOR OF θ-(BEDT-TTF)2(I3)1−x(A)x (A=AuI2, I2Br) SYSTEM
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Nishio Yutaka , Kajita Koji , Sasaki Wataru
Published: July 2006

Electrochemical crystallization with the use of a mixed supporting electrolyte gave θ-(BEDT-TTF)2(I3)1−x(A)x (A=AuI2 and I2Br), where x is very small but non-zero. When A=AuI2 (x=0.03) or A=I2Br (x≅0), the crystals exhibited “partially” superconducting behavior.
AMINO ACID APPROACH AS A GENERAL ROUTE TO NONSTABILIZED AZOMETHINE YLIDES. FACILE GENERATION OF PARENT METHANIMINIUM METHYLIDE AND ITS 1-MONO- AND 1,1-DISUBSTITUTED DERIVATIVES
Authors: Tsuge Otohiko , Kanemasa Shuji , Ohe Masayuki , Takenaka Shigeori
Published: July 2006

Decarboxylative condensation of glycine or N-substituted glycines with a variety of carbonyl compounds such as formaldehyde, aromatic aldehyde, or ketones is a convenient and general route to parent methaniminium methylide and its 1-mono- and 1,1-disubstituted derivatives with or without an N-substituent.
THE STRUCTURE AND PROPERTIES OF TWO POLYMORPHIC FORMS OF PHENOTHIAZINE-TETRACHLOROANTIMONATE
Authors: Uchida Tokiko , Seki Hisao , Ito Masanori , Nakano Chikako K , Hoshizaki Taketoshi , Kozawa Kozo
Published: July 2006

The crystal structure of two polymorphic forms of phenothiazine-tetrachloroantimonate, triclinic and monoclinic forms, was determined. The monoclinic crystal consists of one-dimensional stacking columns of phenothiazine cation radicals and infinite chains of (SbCl4−)n. Its single crystals are semiconductors with an activation energy of 0.3 eV, and possess anisotropic behavior.
YAG Laser-induced Polymerization of Monomers Containing Metal Ions
Authors: Terao Hiromu , Eguchi Shuji , Ibamoto Masahiko , Asano Hideki
Published: July 2006

YAG laser irradiation onto a film of transparent monomers containing Ba2+ or Pb2+ on a glass slide caused polymerization in thin film conditions. The refractive indices of polymers formed by the laser irradiation are about 0.02 higher than those of polymers formed by heating. This could be attributed to the structure with high density.
Formation of Spirocompounds by Rearrangement of N,N-Dimethylhexahydrothienoazocinium or Azoninium Ylides
Authors: Cotelle Philippe , Hasiak Bruno , Barbry Didier , Couturier Daniel
Published: July 2006

Treatment of N,N-dimethylhexahydrothienoazocinium or azoninium salts by sodium amide in liquid ammonia affords spirocompounds. These products arise from ammonium ylides by [2,3] sigmatropy and are easily hydrolyzed to carbonyl compounds by dilute acids.
Asymmetric Synthesis of Silicon Compounds Using Chiral 5,6-Dimethoxy-1,3,2-dioxasilacycloheptane Derivatives
Authors: Kobayashi Kimiko , Kato Takayuki , Masuda Shinji
Published: July 2006

Asymmetric synthesis of silicon compounds was achieved in high optical yield by the substitution reaction of some chiral 5,6-dimethoxy-1,3,2-dioxasilacycloheptane derivatives with organometallic reagents followed by lithium aluminium hydride reduction. These starting dioxasilacycloheptanes were obtained by the coupling reaction of (S,S)-2,3-dimethoxybutanediol and corresponding prochiral dialkyldichlorosilanes.
Inclusion Properties of the New Host Compound 1,2,4,5-Tetra(morpholinocarbonyl)benzene and X-Ray Crystal Structure of Its 1:4 Complex with Water
Authors: Toda Fumio , Kai Akihiro , Yagi Minoru , Mak Thomas C W
Published: July 2006

The title host compound has been prepared and found to form inclusion complexes with water and a variety of alcohols. In its 1:4 crystalline complex with water, the host molecule occupies a centrosymmetric site, each non-adjacent pair of carbonyl oxygen atoms being bridged by two end-to-end hydrogen-bonded water molecules. The water molecules are further interconnected by hydrogen bonds to form two-fold screw spirals parallel to the b axis, giving rise to a layer structure.
A Simple Preparation of N-Protected α-Amino Esters with α,α-Disubstituents from Ethyl Azidoformate and Ketene Silyl Acetals
Authors: Mitani Michiharu , Tachizawa Osamu , Takeuchi Hiroshi , Koyama Kikuhiko
Published: July 2006

The photolysis of ethyl azidoformate in CH3CN containing ketene silyl acetals afforded N-ethoxycarbonyl α-amino esters with α,α,-disubstituents in one step.
Pressure Effect on the Superconducting Transition Temperature of La–Sr–Cu–O System
Authors: Sato Masatoshi , Onoda Masashige , Shamoto Shinichi , Hosoya Shoichi , Maruyama Yusei
Published: July 2006

Effect of pressure on the superconducting transition temperature of La–Sr–Cu–O system has been studied up to 5.9 kbar with the use of a conventional clamp cell method. The transition temperature TC where the resistivity vanishes increases linearly in response to the applied pressure p within the observed range, namely dTC/dp=0.2 K/kbar, and the onset temperature of the superconductivity seems to increase more sensitively with the pressure.
Feature of Internucleotidic 2′,3′-Cyclicphosphate Intermediates During Liquid and Solid Phase Synthesis of RNA Fragments and Practical Synthesis of Octaadenylate in the Phosphoramidite Approach
Authors: Tanimura Hiroshi , Sekine Mitsuo , Hata Tsujiaki
Published: July 2006

Internucleotidic cyclic phosphate intermediates were found to be hydrolyzed completely to give no 2′-5′ linkages under the usual conditions for deprotection in RNA synthesis.
Synthesis of Unsymmetrical Tetraazapentalene Derivatives
Authors: Matsumura Noboru , Tomura Masaaki , Mori Osamu , Yoneda Shigeo
Published: July 2006

The synthesis of unsymmetrical tetraazapentalene derivatives was achieved by the reaction of thiadiazole derivatives (2) with various isothiocyanates. Compounds 2 were easily derived from symmetrical tetraazapentalene derivatives.
Synthesis of Methyl Formate by Electrocatalytic Oxidation of Methanol in the Gas Phase Using Heteropoly and Phosphoric Acids
Authors: Otsuka Kiyoshi , Yamanaka Ichiro , Suga Katsuo
Published: July 2006

A simple method for electrocatalytic conversion of methanol to methyl formate in the gas phase has been demonstrated. The method using heteropoly acids and phosphoric acid in a flow of methanol vapor could be applied successfully for synthesizing methyl formate with high one-pass yield and selectivity.
Synthesis of (4R,5S,11R)-(−)-Cladospolide A, a Phytotoxic Macrolide from Cladosporium cladosporioides
Authors: Maemoto Shun’ichi , Mori Kenji
Published: July 2006

A total synthesis of cladospolide A [(2E,4R,5S,11R)-4,5-dihydroxy-2-dodecen-11-olide] was achieved in 16 steps from ethyl (R)-3-hydroxybutanoate.
Synthetic Approach to 11α-Oxygenated Steroid. Stereoselective Construction of a B,C,D-Ring System in an Optically Active Form
Authors: Kametani Tetsuji , Fukatsu Kohji , Tsubuki Masayoshi , Kawai Ken-ichi , Honda Tohsio
Published: July 2006

Stereoselective synthesis of a B,C,D-ring system of 11α-oxygenated steroid has been achieved by employing 1,3-dipolar cycloaddition reaction as a key step.
Acidic Properties of HZSM-5 Zeolite Aluminated with AlCl3
Authors: Namba Seitaro , Yamagishi Koji , Yashima Tatsuaki
Published: July 2006

The alumination of highly siliceous HZSM-5 with AlCl3 vapor was carried out for 2 h at 923 K. 29Si- and 27Al-MAS NMR and IR spectroscopies show that introduction of 4- and 6-coordinated aluminium atoms occurs during the alumination. Moreover, NH3-TPD spectroscopy exhibits that a considerable amount of the acid sites, whose intensity is stronger than that observed for a common HZSM-5, is generated by the alumination.
Preparation of Mono- and Multilayer Films of Calmodulin Using Langmuir–Blodgett Technique
Authors: Kondo Yoshiyuki , Miwa Tetsuya , Ikegami Hiroshi , Naoi Masatoshi , Ogoma Yoshiro , Fujii Toshihiro , Ohki Kosuke , Akaike Toshihiro
Published: July 2006

Monolayer film of calmodulin using Langmuir–Blodgett technique was successfully deposited onto appropriate plates. The conformational study of calmodulin in Langmuir–Blodgett film was carried out using infrared spectra and circular dichroism spectra, and these results showed that α-helical conformation was predominant and its structure was very similar to that in aqueous solutions.
Zinc(0)–Copper(I) Chloride Promoted Reaction of Methyl Dichlorofluoroacetate with Carbonyl Compounds. A New Efficient Method for the Synthesis of Methyl (Z)-α-Fluoro-α,β-unsaturated Carboxylates
Authors: Ishihara Takashi , Kuroboshi Manabu
Published: July 2006

Methyl dichlorofluoroacetate, easily prepared from methyl trichloroacetate and antimony(III) fluoride, underwent the reductive coupling–elimination reaction with carbonyl compounds in the presence of zinc(0), a catalytic amount of copper(I) chloride, acetic anhydride, and molecular sieves to give the corresponding (Z)-α-fluoro-α,β-unsaturated carboxylic acid methyl esters in high yields.
A New Method for the Synthesis of Oligodeoxyribonucleotides Bearing a 5′-Terminal Phosphate Group
Authors: Hata Tsujiaki , Kamimura Takashi , Urakami Ken-ichi , Kohno Kyoko , Sekine Mitsuo , Kumagai Izumi , Shinozaki Kazuko , Miura Kin-ichiro
Published: July 2006

Two oligoribonucleotides, pAUG and pGUAUUAAUAAUG, which are present in the 5′-terminal region of brome mosaic virus mRNA 4, have been synthesized in the phosphotriester approach involving the use of the phenylthio and anilino (or anisidino) groups as the protecting groups for the 5′- terminal phosphate.
Reductive Telluration of Aliphatic Aldehydes with Hydrogen Telluride. A New Synthesis of Dialkyl Ditellurides
Authors: Kambe Nobuaki , Inagaki Tohru , Miyoshi Noritaka , Ogawa Akiya , Sonoda Noboru
Published: July 2006

Reaction of aliphatic aldehydes with hydrogen telluride under acidic conditions gave dialkyl ditellurides in moderate yields. The use of deuterium telluride formed in situ from aluminum telluride and deuterium oxide provided a facile synthetic method of 1,1′-dideuterated dialkyl ditellurides.
Isolation of the Strained Bridgehead Enol Ether of a Bicyclo[3.3.1]nonan-2-one System
Authors: Wakamatsu Kazumasa , Tan Hiroaki , Ban Norikazu , Uchiyama Naotaka , Niwa Haruki , Yamada Kiyoyuki
Published: July 2006

8-Methyl-2-(trimethylsiloxy)tricyclo[5.3.1.03,8]undec-2-ene (11) was prepared and characterized, which is the first example of the isolable strained bridgehead enol ether of a bicyclo[3.3.1]nonan-2-one system. The reactions of 11 with electrophiles readily occurred at the C-3 bridgehead position.
Indirect Electrooxidation Mediated by an Ni(III)/(II) Redox Couple with a Cyclam Ligand
Authors: Takiguchi Tsuyoshi , Nonaka Tsutomu
Published: July 2006

The first example of an Ni(III)-mediated indirect electrolysis was found in the oxidation of silicon compounds using an Ni(III)/(II) redox couple having a macrocyclic polyamine(cyclam) as a ligand.
An Efficient Method for the Kinetic Resolution of Cyclic dl-Dicarboxylic Anhydrides Catalyzed by Diphenylboryl Triflate
Authors: Ohshima Masahiro , Miyoshi Norikazu , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of diphenylboryl triflate, the kinetic resolution of cyclic dl-dicarboxylic anhydrides is effectively achieved by the use of diphenylboric ester of (R)-2-methoxy-1-phenylethanol as the chiral source.
Oxidative Carbon–Carbon Bond Forming Reaction via a 1,3-Dioxolan-2-ylium Cation
Authors: Hayashi Yujiro , Wariishi Koji , Mukaiyama Teruaki
Published: July 2006

1,3-Dioxolan-2-ylium cations, derived from aldehyde ethylene acetals and trityl cation, react with ketene silyl acetals and enamines to give the corresponding β-keto esters and 1,3-diketones, respectively.
Synthesis of Pyrazinodithiadiselenafulvalenes. New Unsymmetrical π-Donors
Authors: Papavassiliou George C , Yiannopoulos Stelios Y , Zambounis John S , Kobayashi Keiji , Umemoto Kisaburo
Published: July 2006

Unsymmetrical dithiadiselenafulvalenes, which are annelated on the 1,3-dithiole or 1,3-dise1enole moiety to a 1,4-pyrazine ring, have been prepared by the cross coupling method and characterized as electron-donors for use in conductive charge-transfer salts.
Hydrolytic Metalloenzyme Models. Metal Ion Dependent Site-selective Acylations of Hydroxyl Groups of Bis-imidazole Ligands Promoted by Zn2+ and Cu2+ Ions in Cationic Micelles
Authors: Ogino Kenji , Kashihara Nobuyuki , Fujita Tsunehisa , Ueda Toshitomo , Isaka Toshihide , Tagaki Waichiro
Published: July 2006

Co-micelles of cetyltrimethylammonium bromide and lipophilic bis-imidazole ligands having primary and secondary hydroxyl groups in their side chains were investigated for their catalytic activities in the hydrolysis of p-nitrophenyl picolinate in the presence of Zn2+ and Cu2+ at 25 °C. The kinetic and product analyses strongly suggested that the site-selective acylation of hydroxyl groups of ligands occurs via the formation of a tetrahedral for Zn2+ ion and a square planar complex for Cu2+ ion.
Molecular Structure of a Catalytically Active Chiral Ruthenium(II) Complex. Chlorohydridobis[(R)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl]ruthenium(II)
Authors: Kawano Hiroyuki , Ishii Youichi , Kodama Teruyuki , Saburi Masahiko , Uchida Yasuzo
Published: July 2006

Molecular structure of the title complex was determined by the single crystal X-ray diffraction method. The complex has a typical octahedral structure and takes the trans configuration as a whole, where the Cl− and H− occupy the apical coordination sites. The configuration of the seven-membered chelate ring of the phosphine ligand is λ-skew(v).
Supported Sulfide and Sulfur Oxy-Acid Salts. Involvement of Alumina-Induced Cannizzaro Reaction in the Reported Reduction of Aldehydes by Na2S/Alumina
Authors: Ando Takashi , Clark James H , Cork David G , Kimura Takahide
Published: July 2006

Cannizzaro type oxidation-reduction of aromatic and aliphatic aldehydes, promoted by alumina, was observed during study of inorganic-solid-supported sodium sulfide and sulfur oxy-acid salts.
Synthesis of Tetrakis(methylthio)bis(vinylenedithio)tetrathiafulvalene (TMTVT). TTF Derivative Possessing Twelve Sulfurs
Authors: Nakano Hideyuki , Nakamura Tadashi , Nogami Takashi , Shirota Yasuhiko
Published: July 2006

The title molecule (TMTVT) was synthesized as an attractive donor for highly conductive organic salts. TMTVT is the TTF derivative possessing the largest number of sulfurs in a molecule.
Antimicrobial Compounds, Chinesin I and II from Flowers of Hypericum chinense L.
Authors: Nagai Masashi , Tada Masahiro
Published: July 2006

Two new antimicrobial compounds against Gram-positive bacteria, chinesin I and II, were isolated from the flowers of Hypericum chinense L. The structures of chinesin I and II were elucidated on the basis of spectral and chemical evidences. Chinesin I is relatively active in the cytotoxicity test with Hela.
Acylation of 2,4-Disubstituted Thiazolidines and Oxazolidines. Concomitant Epimerization at C-2
Authors: Ando Wataru , Igarashi Yoshiyuki , Huang Liren
Published: July 2006

Acylation of diastereomers of 2,4-disubstituted 4(R)-alkoxycarbonyl thiazolidines and oxazolidines with acyl chlorides affords (2R,4R)-3-acyl isomer as only product without any racemization. The reaction proceeds via concomitant epimeriaztion at C-2 of (2S,4R) diastereomer of the substrates.
New Plastoquinones from the Brown Alga Sargassum sagamianum var. yezoense
Authors: Segawa Makoto , Shirahama Haruhisa
Published: July 2006

The structures of sargahydroquinoic acid and yezoquinolide, new plastoquinones isolated from the brown alga Sargassum sagamianum var. yezoense, were elucidated by chemical and spectral methods.
Simultaneous Determination of Phosphate, Silicate,and Arsenate by On-line Column Flow Injection Analysis
Authors: Narusawa Yoshio , Hashimoto Takahiro
Published: July 2006

The simultaneous determination of phosphate, silicate and arsenate has been examined by adapting an anion-exchange column to the flow injection analyzer. Determination is based on the absorption at 810 nm of the heteropoly blue formed with ascorbic acid as reducing agent. Detection limits(S/N = 3) are 3.1 ng, 0.55 ng and 3.0 ng for phosphorus, silicon and arsenic, respectively.
Thionolactone Claisen Rearrangement
Authors: Takano Seiichi , Tomita Shun’ichi , Takahashi Michiyasu , Ogasawara Kunio
Published: July 2006

Thionolactones prepared from the corresponding γ-lactones are found to be good substrates for the Claisen rearrangement.
Syntheses of Aureothin, Isoaureothin, and Related Geometrical Isomers
Authors: Shizuri Yoshikazu , Uchida Keiko , Yamamura Shosuke
Published: July 2006

Aureothin, isoaureothin, and related compounds have been synthesized in short steps starting from 3,5-dimethyl-6-formyl-4-methoxy-2-pyrone. In addition, the geometry of the conjugated double bonds in isoaureothin and its isomers has been unambiguously determined on the basis of NOE experiments.
First X-Ray Study on Orientation of Addition of Phosphorus Compounds to 3-O-Alkyl-5,6-dideoxy-1,2-O-isopropylidene-6-C-nitro-α-d-xylo-hexo-5-(Z)-enofuranoses
Authors: Yamashita Mitsuji , Sugiura Motoyuki , Tamada Yoshinori , Oshikawa Tatsuo , Clardy Jon
Published: July 2006

Stereochemical control of the addition of phosphorus compounds to 3-O-alkyl-5,6-dideoxy-1,2-O-isopropylidene-6-C-nitro-α-d-xylo-hexo-5-(Z)-enofuranoses was first investigated by X-ray crystallographic analysis of the adduct.
Selective Fluorescence Quenching of Chlorophyll a-N-Methylmyristamide System by Methylviologen in Aqueous Sodium Dodecyl Sulfate Solution
Authors: Kusumoto Yoshihumi , Watanabe Junko , Kurawaki Junichi , Satake Iwao
Published: July 2006

Addition of methylviologen to the chlorophyll a (Chl)-N-methylmyristamide system in aqueous sodium dodecyl sulfate solution led to the selective fluorescence quenching of monomeric and aggregated Chi species in the concentration range of surfactant below and above the critical micelle concentration, respectively.
On the Reactivity of Chlorine Atoms towards Alcohols
Authors: Sumiyoshi Takashi , Miura Kazuhiro , Hagiwara Hiroyuki , Katayama Meiseki
Published: July 2006

Pulse radiolysis has been used to determine reaction rate constants of chlorine atoms with various alcohols in carbon tetrachloride solutions by competition kinetic methods taking the absorption of the complex formed in the reaction of dimethyl sulfoxide and chlorine atoms as a reference system.
A New Method for Introducing Some Active Methylene or Methine Groups to the 3-Position of Pyrrolidine or Piperidine Skeleton, and Its Application to Preparation of a Key Intermediate for (±)-Eburnamonine Synthesis
Authors: Shono Tatsuya , Matsumura Yoshihiro , Ogaki Masaru , Onomura Osamu
Published: July 2006

A new method for introducing a bis(methoxycarbonyl)methyl or 2-oxopropyl group to the 3-position of pyrrolidine or piperidine skeleton has been exploited, and this method could be used in the synthesis of a key intermediate for the (±)-eburnamonine synthesis.
Spectra of CH4 Adsorbed on an NaZSM-5 Zeolite under Pressures up to 1 MPa
Authors: Yamazaki Tatsuya , Abe Yoshitaka , Watanuki Isao , Ding Tongfu , Ozawa Sentaro , Ogino Yoshisada
Published: July 2006

A special cell for measuring IR spectra of adsorbed species under pressures up to 1.5 MPa has been made. With this cell, the IR v1 absorption of methane adsorbed on an NaZSM-5 zeolite is obtained even at room temperature and at a moderately high pressure. The v1 absorption intensity increases linearly with the amount of methane adsorption. The electric field strength in the zeolite pore has been evaluated to be 3.6×109 V·m−1.
Polymerization of Benzene Catalyzed by Aluminium Chloride-Copper(I) Chloride under Oxygen
Authors: Hirai Hidefumi , Toshima Naoki , Kanaka Keiichi , Koshirai Atsunori
Published: July 2006

Polymerization of benzene to poly(1,4-phenylene) has been succeeded under oxygen using an aluminium chloride-copper(I) chloride catalyst. Treatment of benzene with aluminium chloride/copper(I) chloride (3/1 molar ratio) under oxygen at 70 °C gave poly(1,4-phenylene) in 187% yield based on the molar quantity of copper(I) chloride. Extra addition of aluminium chloride in the course of the reaction increased the yield dramatically from 187% to more than 600%.
Preparation of Highly Active Hydrogenation Catalyst by Immobilization of Polymer-Protected Colloidal Rhodium Particles
Authors: Hirai Hidefumi , Ohtaki Michitaka , Komiyama Makoto
Published: July 2006

Colloidal dispersion of rhodium protected by copolymer of methyl acrylate and N-vinyl-2-pyrrolidone is treated with polyacrylamide gel having amino groups, resulting in immobilization of the rhodium particles onto the gel. The gel-immobilized rhodium particles exhibit 2–22 fold larger catalytic activities than a rhodium carbon catalyst for hydrogenation of olefins at 30 °C under 1 atm.
A Synthetic Approach to Furanocembranolides
Authors: Kondo Akihiro , Ochi Takeshi , Iio Hideo , Tokoroyama Takashi , Siro Motoo
Published: July 2006

The furanocembranoid skeleton of lophotoxin-type has been constructed efficiently by a method utilizing the formation reaction of a furan ring for the macrocyclization.
Heterocyclic Acceptors in Diastereoselective Palladium Mediated [3+2] Cycloadditions
Authors: Trost Barry M , King Steven A , Nanninga Thomas N
Published: July 2006

Whereas cyclohexenones and ketones are poor acceptors for palladium mediated cycloadditions of 2-trimethylsilylmethylallylacetate, oxygen heterocycles bearing such functionality react smoothly and with high diastereoselectivity.
Decrease of Molecular Weight of Polystyrene by Ball-milling
Authors: Fukunaga Kimitoshi , Kimura Makoto
Published: July 2006

Mechanochemical degradation of monodispersed polystyrene by a ball mill has been studied. A consistent bimodal mode of the degradation was observed for all monodispersed polystyrenes examined. From this mode of the degradation, information on the distribution of a degraded polymer molecule was obtained.
Formation of a Novel Acyl Anion Equivalent by the Electroreduction of Oxazolinium Salts
Authors: Shono Tatsuya , Kashimura Shigenori , Yamaguchi Yoshihide , Ishige Osamu , Uyama Hiroshi , Kuwata Fumitaka
Published: July 2006

Electroreduction of oxazolinium salts synthesized from the corresponding carboxylic acids gave a novel acyl anion equivalent (AAE). The reaction of these AAEs with electrophiles afforded the corresponding aldehydes or ketones in good yields.
Novel Syntheses of Bis(trialkylsilyl)amines by Reductive Trialkylsilylation of Azo Compounds
Authors: Kira Mitsuo , Nagai Satoshi , Nishimura Mitsushi , Sakurai Hideki
Published: July 2006

Reduction of azo compounds with a system of a trialkylchlorosilane and lithium has been found to afford bis(trialkylsilyl)amines in the presence of a transition metal halide as a catalyst in THF. The reaction course was significantly modified by using t-butyldimethylchlorosilane as a trialkylchlorosilane.
Electrochemical Preparation of Poly(p-phenylene) Using Trifluoromethane Sulfonic Acid as a Catalytic Electrolyte
Authors: Tsuchida Eishun , Yamamoto Kimihisa , Asada Toshio , Nishide Hiroyuki
Published: July 2006

Electro-oxidative polymerization of benzene in the presence of trifluoromethane sulfonic acid yields poly(p-phenylene) efficiently; The acid forms a protonated complex of benzene and cathodically shifts its oxidation potential.
Novel Two-Step Synthesis of Homobarrelenones, Bicyclo[3.2.2]nona-3,6,8-trien-2-ones, from Tropones and 2,3-Bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]heptadiene by High-Pressure Cycloaddition-Thermal Cycloreversion Procedure
Authors: Tian Guan Rong , Sugiyama Shigeru , Mori Akira , Takeshita Hitoshi
Published: July 2006

The Diels–Alder adduct of tropone with 2,3-bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]hepta-2,5-diene formed homobarrelenone by heating at ca. 130 °C. Similarly prepared were 1-hydroxy-, 3-methoxy-, 1-chloro-, and 3-chlorohomobarrelenones. High-pressure cycloaddition improved the yields of the Diels–Alder adducts.
Langmuir–Blodgett Films of Polyallylamine Modified by Fluorocarbon
Authors: Sekiya Akira , Ishida Hiroyasu , Tamura Masanori , Watanabe Masako
Published: July 2006

Fluoroalkyl groups were introduced to polyallylamine by the treatment with ethyl perfluorooctanoate. Langmuir–Blodgett films of the fluorinated polymer were successfully prepared. Characterizations of the films were attempted.
Protecting Group for Carboxyl Function. Cleavage of 2-Tosylethyl Esters with Fluoride Ion in Non-aqueous Media
Authors: Tsutsui Hironori , Muto Masakazu , Motoyoshi Katsuyuki , Mitsunobu Oyo
Published: July 2006

2-Tosylethyl carboxylates reacted with tetrabutylammonium fluoride in tetrahydrofuran at 0 °C for 1 h to give the corresponding free acids in nearly quantitative yields. Under the same conditions, t-butyldimethylsilyl protecting group of secondary alcohols remained intact.
Electrocatalytic Hydrogenation on Nickel Microparticle Electrodes
Authors: Yamada Tsukasa , Osa Tetsuo , Matsue Tomokazu
Published: July 2006

Nickel microparticle electrodes were prepared by electrodeposition in a Nafion film coated on graphite or nickel plate. The nickel particles were distributed three-dimentionally on and into the Nafion film and their diameters were in a range of 50 to 200 nm. These electrodes have shown higher activity for hydrogenation of 2-cyclohexen-1-one than the electrodeposited nickel cathode without Nafion or Raney-nickel particle cathode.
Dynamic Processes in W/O Type Microemulsions Studied by a Dynamic Light Scattering Technique
Authors: Abe Masahiko , Nakamae Masato , Ogino Keizo , Wade William H
Published: July 2006

Dynamic processes in W/O type microemulsions have been studied by using a submicron particle analyzer. When large particles of microemulsion, which include water, are in quiet contact with the smaller particles without any stirring, the size of the microemulsion droplets will change due to solubilizate exchange between W/O type microemulsion droplets.
A Convenient Synthesis of Fluorine-Containing Highly-Substituted Furans through New Fluoride Ion-Catalyzed Reaction of 1-Alkyl-F-1-alkenyl Phosphates
Authors: Kuroboshi Manabu , Shinozaki Takao , Ishihara Takashi , Ando Teiichi
Published: July 2006

1-Alkyl-F-1-alkenyl phosphates, easily prepared from alkyl F-alkyl ketones and sodium diethyl phosphite, underwent the dephosphorylation followed by cyclocondensation in the presence of a fluoride ion catalyst and triethylamine at ambient temperature to give 3,4-di-F-alkylated furan derivatives in moderate to good yields.
Nature of Metal-Olefin Bond in Neutral η3-Allyl (olef in)platinum(II) Complexes. In-plane Olefin Coordination and Stability Trend Unusually Weakly Dependent on Electronic Effect of Olefin-substituent
Authors: Kurosawa Hideo , Ohnishi Hiroaki , Miki Kunio , Kasai Nobutami , Tatsumi Kazuyuki , Nakamura Akira
Published: July 2006

Relative olefin coordination ability in Pt(η3-CH2CMeCH2)(CH2=CHC6H4Y)(C6F5)(2)was determined to show the stability trend unusually weakly dependent on the electronic property of the substituent Y. The crystal structure of the styrene complex 2 (Y= H) revealed the C=C bond oriented parallel to the coordination plane. The nature of Pt-olefin bond in 2 has been discussed in terms of these stability and structural trends.
Photosensitized Hydride Transfer. Highly Regioselective 1,4-Photoreduction of NAD(P)+ Models under Visible Light with an Organometallic Rhodium(III) Porphyrin as Sensitizer
Authors: Aoyama Yasuhiro , Midorikawa Koji , Toi Hiroo , Ogoshi Hisanobu
Published: July 2006

An organometallic acetyl-Rh complex of octaethylporphyrin catalyzes under the visible light the photoreduction of 1-benzylnicotinamide (BNA+) or l-benzyl-3-acetylpyridinium ion (BAP+) as NAD(P)+ model with tetraphenylborate as a reductant and an alcohol as a proton source to give the corresponding 1,4-dihydro derivative (BNAH or BAPH) as the sole reduction product and biphenyl as the oxidation product of B(C6H5)4.
A Novel Enantiocontrolled Synthesis of (+)-9-Deacetyl-9-(hydroxymethyl)-4-demethoxydaunomycinone
Authors: Izawa Toshio , Wang Zhe-qing , Nishimura Yoshio , Kondo Shinichi , Umezawa Hamao
Published: July 2006

An enanticcontrolled synthesis of (+)-9-deacetyl-9-(hydroxymethyl) -4-demethoxydaunomycinone has been achieved via asymmetric introduction of the 9-hydroxyl group as a key step by catalytic Sharpless epoxidation.
Structural and Electrical Properties of (BEDT-TTF)3CI2(H2O)2
Authors: Mori Takehiko , Inckuchi Hiroo
Published: July 2006

An organic conductor (BEDT-TTF)3Cl2(H2O)2 (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene) has been prepared by using [(C2H5)4N]2CoCl4 as an electrolyte. This complex shows as high a conductivity as σrt = 500 S cm−1, and undergoes a metal–semiconductor transition around 100 K.
Phenylacetaldehyde as an Effective Additive for the Selective Hydrogenation of Some Nonconjugated Dienes to Monoenes over Palladium Catalysts
Authors: Nishimura Shigeo , Ishibashi Masayoshi , Takamiya Hiroshi , Koike Naomi , Matsunaga Tadashi
Published: July 2006

Methyl linoleate and 1,5-cyclooctadiene are hydrogenated with high selectivity to the corresponding monoenes over palladium catalysts in the presence of added phenylacetaldehyde, with almost complete depression of the hydrogenation to the saturates.
The Trityl Cation Catalyzed Michael Type Reaction of Stannylated Nucleophiles with Ethylthioketene Dithioacetals
Authors: Hashimoto Yukihiko , Sugumi Hiroyuki , Okauchi Tatsuo , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl salt, allylstannanes and stannylated enolates smoothly react with 2-(2-ethylthioalkylidene)-1,3-dithiolane, synthetic equivalent of α,β-unsaturated ester, to afford the corresponding adducts in good yields, respectively.
Photoelectron Mean Free Path in Langmuir–Blodgett Film Estimated from Angular Dependence of X-Ray Photoelectron Spectra
Authors: Kajiyama Tisato , Morotomi Naoaki , Hiraoka Shoji , Takahara Atsushi
Published: July 2006

The Langmuir–Blodgett (built-up) film of barium stearate was prepared and its angular dependence of X-ray photoelectron spectra was obtained. A simple layer model was proposed to evaluate angular dependence of X-ray photoelectron spectra. The electron mean free path of C1s photoelectron (kinetic energy of ca.965 eV) was determined from comparison between experimental and calculated take-off angle dependences of intensity of C1s spectra.
Stereo-differentiation in the Coupling Reaction of Boc-Dl-Amino Acid with Poly-l(or d)-Amino Acids Attached to Polystyrene Resin
Authors: Munegumi Toratane , Harada Kaoru
Published: July 2006

Boc-Dl-amino acids(Ala, Val, Leu) were coupled with known length of poly-l(or d)-amino acids(Ala, Val) attached to polystyrene resin by dicyclohexylcarbodiimide(DCC). Preferential couplings of Boc-l-Val with poly-l-Ala resin(e.e.≤23%) and of Boc-l-Leu with poly-d-Val resin(e.e.≤54%) were observed.
A Preparative Method of Dl-threo-3-Isopropylmalic Acid and Dl-threo-[2-2H]-3-Isopropylmalic Acid
Authors: Yamada Tohru , Kakinuma Katsumi , Oshima Tairo
Published: July 2006

A practical preparative method of the titled compounds was exploited, during which unusually erythro-favored aldol condensation of an lower alkyl ester was observed.
Photoactivation of Nitrile Hydratase in Corynebacterium sp. N-774
Authors: Nakajima Yasutaka , Doi Toshiaki , Satoh Yoshiaki , Fujiwara Atsushi , Watanabe Ichiro
Published: July 2006

Irradiation of cells or extracts of Corynebacterium sp. N-774 with light increased nitrile hydratase activity. The effective wavelength was about 370 nm, i.e., the near-ultraviolet region. When stored at 0 °C in the dark, the enzyme activity of cells gradually decreased, and most of the lost activity could be restored by irradiation with light.
Asymmetric Allylic Alkylation of 1,3-Disubstituted 2-Propenyl Acetates Catalyzed by a Chiral Ferrocenylphosphine–Palladium Complex
Authors: Hayashi Tamio , Yamamoto Akihiro , Ito Yoshihiko
Published: July 2006

Reaction of racemic 2-propenyl acetates substituted with two different aryl groups at 1 and 3 positions with sodium acetylacetonate in the presence of a palladium catalyst containing an optically active ferrocenylphosphine ligand gave regioisomeric allylic alkylation products of high optical purity (up to 95% ee).
Effects of External Magnetic Fields on Laser-Induced Electron-Transfer Reactions in Porphyrin–Viologen Pairs at the Surface of Molecular Bilayers
Authors: Usui Satoshi , Nakamura Hiroshi , Ogata Takeshi , Uehata Akihiro , Motonaga Akira , Matsuo Taku
Published: July 2006

Photoinduced electron transfer from amphiphilic zinc porphinate in bilayer membranes to various viologen derivatives was investigated by the use of external magnetic field (EMF). In the presence of EMF, the reverse reaction was appreciably retarded, when the photo-reduced viologen molecule was tightly bound to the oxidized counterpart (zinc porphinate cation radical) either by Coulombic or by amphiphilic interactions. Effects of EMF were not detected when the photogenerated radical pairs had good chance of cage escape.
New Radical Anion Complex, [(CH3)4N][Ni(dmit)2]2 with Metal-Semimetal Phase Transition
Authors: Kim Hyernjoo , Kobayashi Akiko , Sasaki Yukiyoshi , Kato Reizo , Kobayashi Hayao
Published: July 2006

The crystal structure determination was made on the multi-sulfur π-acceptor complex, [(CH3)4N][Ni(dmit)2]2, which is the first molecular metal composed of Ni(dmit)2 (dmit=isotrithionedithiolate) molecules and the closed-shell cations. The metal-semimetal transition with large hysteresis was observed.
Regioselective Oxyselenenylation
Authors: Toru Takeshi , Yamada Yoshio , Maekawa Eturô , Ueno Yoshio
Published: July 2006

The regioselective oxyselenenylation of terminal olefins or cycloalkenes was achieved via olefin oxymercuration and subsequent radical substitution by selenenylating reagent such as S-benzoyl Se-phenyl selenosulfide, diphenyl diselenide, or phenylselenocyanide. Successful application to intramolecular selenocyclization of a mercurial bearing an α,β-unsaturated ester is also described.
A New Finding in the Dieckmann Type Annulation of a Chiral Half-Thiol Diester Having Latent σ-Symmetry
Authors: Nagao Yoshimitsu , Nakamura Takeshi , Ochiai Masahito , Fuji Kaoru , Fujita Eiichi
Published: July 2006

It was revealed that the Dieckmann type annulation of a half-thiol diester having latent σ-symmetry did not always proceed in the regiocontrolled fashion even though the reaction yielded the desired β-keto ester. Direction of the regioselectivity dramatically differed depending on the base employed, which was demonstrated by treating an optically pure half-thiol diester with lithium diisopropylamide, dimsylsodium, and dimsylpotassium, respectively.
New Phases in Vanadium Phosphorus Oxides as Butane Selective Oxidation Catalyst
Authors: Matsuura Ikuya , Mori Atsuhito , Yamazaki Mami
Published: July 2006

A new phase, β′, has been characterized through a combination of techniques redox titration, paper chromatography, and XRD measurements. The general formula of β′-phase with (VO)2+(VO)2n−13+ (P2O7)4−(PO4)2n3− (n is 1,2,4.8,- - -,) was performed. The β′-phase is indexed in orthorhombic system with the space group C2v5 similar to that of (VO)2(P2O7). The cell dimensions for the full oxidized β′-phase are given a = 9.751 Å, b = 8.451 Å, and c = 16.968 Å. A topotactic redox reaction undergoes between β′-phase and (VO)2P2O7 for the oxidation of butane to maleic anhydride.
Oxazoles Are Masked Carboxyls That Activate Ortho-Leaving Groups in Nucleophilic Aromatic Substitution
Authors: Cram Donald J , Bryant Judi A , Doxsee Kenneth M
Published: July 2006

Oxazoles substituted in their 2-positions with 2-methoxy-, 2-fluoro-, or 2,6-difluorophenyl groups, and in their 4,5-positions with methyls or phenyls, were treated with ArMgBr or ArLi to give substituted biphenyl or terphenyl products. The oxazole groups were subsequently converted to esters, acids, or amides. These reactions provide a new unsymmetrical aryl-aryl coupling synthon.
Chemical Trapping of 1,4-Biradicals with Hydrogen and Deuterium Selenides
Authors: Kambe Nobuaki , Masawaki Teruyuki , Kondo Kiyoshi , Miyoshi Noritaka , Ogawa Akiya , Sonoda Noboru
Published: July 2006

1,4-Biradicals photogenerated from alkyl phenyl ketones have been trapped directly by hydrogen selenide before the biradicals undergo usual collapsing. Two hydrogen atoms are thus introduced into both radical sites. The rate constant for hydrogen abstraction of secondary carbon radicals from H2Se has been estimated to be greater than 1.6×108 M−1s−1.
Asymmetric Hydrogenation of 2-Aryl-1-nitropropenes by Fermenting Bakers’ Yeast
Authors: Ohta Hiromichi , Ozaki Kazuhiko , Tsuchihashi Gen-ichi
Published: July 2006

2-Aryl-1-nitropropenes were enantioselectively hydrogenated on C=C double bonds by incubation with fermenting bakers’ yeast to afford optically active 2-aryl-1-nitropropanes.
Liquid Phase Oxidation of 2,6-Di-t-butylphenol by Molecular Oxygen Using Magnesium Oxide Catalysts Modified with Metal Ion
Authors: Kurokawa Hideki , Ueda Wataru , Morikawa Yutaka , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Mn(II), Co(II), Cu(II), or Fe(III) ion containing magnesium oxides catalyzed oxidation of 2,6-di-t-butylphenol to quinones by molecular oxygen. 98% Yield to 1,1′-bis(4-oxo-3,5-di-t-butylcyclohexadienylidene) was obtained with 16.7 wt% Mn ion containing magnesium oxide catalyst.
The Active Hydrogen Electrochemically or Thermally Generated on Pd/H3PO4/Pd Catalysts
Authors: Otsuka Kiyoshi , Yamanaka Ichiro
Published: July 2006

Hydrogenation of 2-propanol into propane was caused by the hydrogen atoms electrochemically generated on Pd-black of the electrocatalytic cell Pd/H3PO4/Pd. The reaction was also caused by the hydrogen generated through spillover and reverse spillover between Pd and H3PO4. Under closed circuit conditions, the latter hydrogenation over the anode Pd was retarded because of the inhibition of the reverse spillover.
A Convenient Method for the Transformation of Alkenyl Sulfides to 2-(Phenylthio)alkanenitriles, Homoallyl Sulfides, and Thioacetals
Authors: Takeda Takeshi , Kaneko Yuichiro , Nakagawa Hitoshi , Fujiwara Tooru
Published: July 2006

2-(Phenylthio)alkanenitriles, homoallyl sulfides, and thioacetals were obtained in good yields by the reaction of alkenyl sulfides with the corresponding silyl nucleophiles via thionium ion intermediates.
Reformatsky Reaction of Methyl 2-Bromo-3,3,3-trifluoropropanoate. A Synthetic Method for α-Trifluoromethyl-β-hydroxy Esters
Authors: Yokozawa Tsutomu , Ishikawa Nobuo , Nakai Takeshi
Published: July 2006

The Reformatsky reagent, prepared from the title bromo-ester and zinc powder in dioxane, is found to be thermally stable enough to undergo addition reactions with aldehydes to afford the α-trifluoromethyl-β-hydroxy esters in high yields. The unique reactivity of the fluorinated zinc reagent is discussed.
Preparation of Graphite Intercalation Compound of Vanadium Fluoride in Fluorine Atmosphere
Authors: Nakajima Tsuyoshi , Matsui Takeo
Published: July 2006

Graphite intercalation compound(GIC) of vanadium fluoride has been prepared in fluorine atmosphere. The GIC’s prepared were stage 1–8 compounds with composition, C8.4−79.5VF5.8−6.0. The size of intercalated VF6−(di) decreased from 0.533 nm to 0.415 nm with increasing x in CxVF6. The compounds with small di’s showed high stability in air.
ESR Studies of Active Surface Titanium Ions on Anchored Ti-Oxide Catalysts
Authors: Anpo Masakazu , Shima Takahito , Fujii Tsuneo , Suzuki Satoshi , Che Michel
Published: July 2006

ESR studies of the photoreduction of Ti-oxide supported onto porous Vycor glass showed that anchored samples exhibit only one type of Ti3+ ions, which are in position of low coordination. On the other hand, impregnated catalysts show several types of Ti3+ ions with different coordinations.
Structural Studies on a Photosystem II Reaction-Center Complex Consisting of D-1 and D-2 Polypeptides and Cytochrome b-559 by Resonance Raman Spectroscopy and High-Performance Liquid Chromatography
Authors: Fujiwara Masao , Hayashi Hidenori , Tasumi Mitsuo , Kanaji Mariko , Koyama Yasushi , Satoh Kimiyuki
Published: July 2006

Resonance Raman spectra of chlorophyll a and β-carotene moieties have been observed from a photosystem II reaction-center complex containing the D-1 and D-2 polypeptides and cytochrome b-559. Examination of the CC double-bond and the keto CO stretching regions of chlorophyll a moiety has indicated that the Mg atom is five-coordinate and the keto CO is hydrogen-bonded. The resonance Raman spectrum of β-carotene moiety has suggested that this carotenoid molecule takes the all-trans form. This suggestion has been supported by an HPLC analysis of the extracted carotenoid.
Carbon and Nitrogen Contents of Carbonaceous Chondrites and Their Implications for a Primitive Condensate in the Early Solar System
Authors: Shimoyama Akira , Harada Kaoru , Yanai Keizo
Published: July 2006

We found that C vs. N contents in Antarctic carbonaceous chondrites can be approximated by the equation, log N = a log C − b. Extrapolating the equation, we estimated that over 80% of a condensate more primitive than C1 chondrites, consist of organic matter and water.
Acetal-bond Cleavage of 4,6-O-Alkylidenehexopyranosides by Diisobutylaluminium Hydride and by Lithium Triethylborohydride-TiCl4
Authors: Mikami Tetsuhiro , Asano Hiroyuki , Mitsunobu Oyo
Published: July 2006

Regioselective acetal-bond cleavage of 4,6-O-benzylidene-and 4,6-O-(4-methoxybenzylidene)-α-d-altropyranosides by DIBAL or Li(C2H5)3BH–TiCl4 is described. The sense of regioselectivity could be controlled by suitable choice of the protecting group of hydroxyl function at C-3. Reduction of 4,6-O-alkylideneglucopyranosides by DIBAL is also examined.
Simultaneous Catalytic Removal of NO and SO2 over Pt/ZSM-5 and V2O5–MoO3/TiO2 Catalysts
Authors: Teraoka Yasutake , Shimanoe Kengo , Yamazoe Noboru
Published: July 2006

The simultaneous catalytic remov.al of NO and SO2 was examined over solid catalysts. SO2 oxidation was found to be more difficult than NO reduction with NH3. Pt/ZSM-5 and V2O5–MoO3/TiO2 showed high stationary activities for both reactions, suggesting a possibility of the simultaneous removal process of NO and SO2 by using solid catalysts.
New Near Infrared Absorbing Metal Complex Dyes with N,O-Bidentate Ligands, 6-Substituent-5,8-quinolinediones
Authors: Yoshida Katsuhira , Ishiguro Miwa , Kubo Yuji
Published: July 2006

New metal complex dyes were synthesized by the reaction of various 6-substituent-5,8-quinolinediones with transition metal salts. The first absorption bands of these dyes were sensitively shifted to longer wavelength with increase of electron-donating power of the 6-substituents and reached to the near infrared region.
The Asymmetric Hydrocyanation of Aldehydes with Cyanotrimethylsilane Promoted by a Chiral Titanium Reagent
Authors: Narasaka Koichi , Yamada Tohru , Minamikawa Hiroyuki
Published: July 2006

The asymmetric hydrocyanation of aldehydes with cyanotrimethylsilane proceeds by the use of a chiral alkoxy titanium(IV) to give the corresponding cyanohydrins with good enantioselectivity.
Matrix Effect. Dimerization of Silylenes at 77 K in the Matrix
Authors: Sekiguchi Akira , Hagiwara Kazuyoshi , Ando Wataru
Published: July 2006

The dimerization of silylenes was studied in hydrocarbon IP matrix ranging in viscosity from 106 to 1012 at 77 K. The silylenes dimerized to disilenes in soft matrix at 77 K without annealing.
1-Trimethylsiloxyallylic Iron Complexes as a β-Acylcarbanion Equivalent
Authors: Ito Keiji , Nakanishi Saburo , Otsuji Yoshio
Published: July 2006

3-Iodo-1-trimethylsiloxypropenes, which were derived by the reaction of α,β-unsaturated ketones and esters with iodotrimethylsilane, gave (η3-1-trimethylsiloxyallylic)Fe(CO)2NO complexes upon treatment with tetrabutylammonium tricarbonylnitrosylferrate. These allylic iron complexes reacted regioselectively with 2-propynyl bromide, giving the corresponding 4-pentynyl ketone and 5-hexynoic ester derivatives.
Iodination of Phenols by Use of Benzyltrimethylammonium Dichloroiodate(1–)
Authors: Kajigaeshi Shoji , Kakinami Takaaki , Yamasaki Hiromichi , Fujisaki Shizuo , Kondo Manabu , Okamoto Tsuyoshi
Published: July 2006

The reaction of phenols with benzyltrimethylammonium dichloroiodate(1–) in dichloromethane-methanol in the presence of CaCO3 or NaHCO3 for several hours at room temperature gave iodophenols in good yields.