bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Kinetic Resolution with Enantioselective Borohydride Reduction Catalyzed by Optically Active β-Ketoiminato Cobalt(II) Complexes: Highly Diastereo- and Enantioselective Preparation of Optically Active anti-Aldol Compounds
Authors: Ohtsuka Yuhki , Miyazaki Daichi , Ikeno Taketo , Yamada Tohru
Published: September 2002

Optically active anti-2-alkyl-3-hydroxy esters were stereoselectively obtained from the corresponding 2-alkyl-3-keto esters using enantioselective borohydride reduction along with dynamic kinetic resolution in the presence of optically active β-ketoiminato cobalt complex catalysts. The reduction system provided an alternative preparation for anti-aldol compounds with high diastereo- and enantioselectivities.
Self-Assembly of 9-Allyladenine Hydrochloride in Crystalline State: Formation of Infinitely Stacked Supramolecular Sheets via Hydrogen Bonding Network
Authors: Srivatsan S G , Kingsley S , Verma Sandeep
Published: September 2002

This report describes solid state structure of a chemically-modified nucleobase 9-allyladenine hydrochloride. The crystal structure of the protonated nucleobase extends into an infinitely stacked, sheet like-supramolecular aggregates stabilized by multiple conventional and non-conventional hydrogen bonds.
Metal-Ion Induced Intramolecular Charge-Transfer Fluorescence of p-Pentamethyldisilanylacetophenone
Authors: Kira Mitsuo , Badugu Ramachandram , Li Tingxi , Setaka Wataru , Sakamoto Kenkichi , Hashimoto Hisako
Published: September 2002

In the presence of Lu3+ and Sc3+ ions, p-pentamethyldisilanylacetophenone shows dual fluorescence, characteristic of a phenylpentamethyldisilane with an electron-accepting substituent on benzene ring, where the wavelengths of the LE (locally excited) and ICT (intramolecular charge transfer) band maxima and their relative intensity are dependent on the metal ions.
Polyphenylsilsesquioxane Partially-substituted with Germanium: Refractive Index Controllability and Thermal Stability
Authors: Yasuda Naoki , Yamamoto Shigeyuki , Hasegawa Yasuchika , Nobutoki Hideharu , Wada Yuji , Yanagida Shozo
Published: September 2002

The refractive index of a novel silicon-germanium ladder copolymer synthesized by partially substituting silicon in the main chain of polyphenylsilsesquioxane by germanium could be controlled between 1.558 and 1.573 by changing the content of germanium up to 10 mol%, without losing thermal stability over 500 °C.
Selective Catalytic Reduction of NOx in Lean Burn Engine Exhaust by Highly Active Pt Supported on V-impregnated MCM-41
Authors: Jeon Jong Yeol , Kim Hee Young , Woo Seong Ihl
Published: September 2002

On the Pt/V/MCM-41 catalyst with 1 wt% Pt and 4 wt% V, the maximum conversion of NO reduction into N2+N2O by C3H6 was about 73%, which was 10% higher than on 1 wt% Pt/silica, and this maximum conversion was maintained over a temperature range of 70 °C between 270 and 340 °C.
Bismuth Trichloride Catalyzed Efficient Reductive Etherification of Carbonyl Compounds with Alcohols: A Novel Method for Preparation of Symmetrical and Unsymmetrical Ethers
Authors: Wada Makoto , Nagayama Sonoe , Mizutani Kaori , Hiroi Ryoichi , Miyoshi Norikazu
Published: September 2002

The reductive homocoupling of a carbonyl compound and heterocoupling of a carbonyl compound with a non-protected alcohol were both effected smoothly at room temperature with triethylsilane in the presence of a catalytic amount of bismuth trichloride to afford the corresponding ethers in good yields.
Polymer-supported Sulfinimidoyl Chloride as a Useful Reagent for Oxidation of Various Alcohols to the Corresponding Carbonyl Compounds
Authors: Matsuo Jun-ichi , Kawana Asahi , Pudhom Khanitha , Mukaiyama Teruaki
Published: September 2002

Polymer-supported sulfinimidoyl chloride was prepared in four steps from chloromethyl polystyrene resin. Stoichiometric and catalytic oxidations of various alcohols to the corresponding carbonyl compounds were carried out cleanly by using the prepared polymer-bound oxidant.
Controlled Synthesis of CdS Nanorods by a Novel Route
Authors: Chen Yuan-tao , Guo Yun , Li Hu-lin
Published: September 2002

CdS nanorods were successfully synthesized through CS2 reacting with CdCl2 and ethylenediamine in tetradecylamine aqueous solution. The as-obtained samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The size of CdS nanorods was controlled simply by varying the growth temperature.
Synthesis of NiS Nanowhiskers via Surfactant-aid Hydrothermal Reaction
Authors: Xie Bo , Jiang Yang , Yuan Shengwen , Li Qing , Wu Yue , Wu Ji , Qian Yitai
Published: September 2002

Uniform NiS nanowhiskers have been prepared via a hydrothermal reaction between NiCl2•6H2O and Na2S2O3 in the presence of surfactant of C17H33COOK (potassium oleate). The images characterized through XRD and TEM indicates the morphology of hexagonal NiS is uniform nanowhiskers with an average diameter of 80 nm and length in micrometer scale. The formation mechanism and surfactant effect were discussed in details.
Electron Transfer Reaction of Glucose Oxidase Hybrids Modified with Phenothiazine via Poly(ethylene oxide) Spacer on Acidic Amino Acid Residues
Authors: Aoki Sayuri , Ishii Kunikazu , Ueki Takeshi , Ban Kazumichi , Imabayashi Shin-ichiro , Watanabe Masayoshi
Published: September 2002

GOx hybrids [GOx-(PT-PEO-NH2)] are prepared by covalently bonding phenothiazine(PT)-labeled poly(ethylene oxide)(PEO) oligomers having an amino end group, PT-PEO-NH2, to acidic amino acid residues on the enzyme surface. The rate constant for the mediated FADH/FADH2 oxidation calculated from the catalytic current under substrate-saturated conditions ranges from 1.7 to 388 s-1, and the largest value is obtained for GOx hybrids with PT-PEO of molecular weight 3000. Surprisingly effective electron transfer from FADH/FADH2 to PT+ is achieved in the GOx-(PT-PEO-NH2) hybrids due to the PT modification to aspartic or glutamic acid residues, many of which are located close to the FAD center.
Structural Phase Transition and Valence Fluctuation Observed in a New MMX Chain Compound, Pt2(n-PrCS2)4I
Authors: Mitsumi Minoru , Umebayashi Shunsuke , Ozawa Yoshiki , Toriumi Koshiro , Kitagawa Hiroshi , Mitani Tadaoki
Published: September 2002

A new one-dimensional iodo-bridged mixed-valence diplatinum(II,III) complex (MMX chain compound) with dithiobutanoate (n-PrCS2-) as a ligand, Pt2(n-PrCS2)4I, was found to undergo a structural phase-transition at 358–359 K by the differential scanning calorimetry (DSC) measurement and X-ray crystal structure analyses. In X-ray diffraction photographs measured using synchrotron radiation of the SPring-8 facility, the weak but distinct Bragg spots corresponding to the periodicity of 2-fold repetition length of a –Pt–Pt–I– unit were observed at 300 K and changed to diffuse scattering at 350 K. The electric conductivity deviates from the typical semiconducting behavior in the temperature region above 330 K.
Highly Efficient and Enantioselective Method for the Synthesis of Chiral Building Blocks Derived from meso-1,3-Propanediols
Authors: Oriyama Takeshi , Taguchi Hiromoto , Terakado Dai , Sano Tomohumi
Published: September 2002

Highly efficient, direct, and enantioselective synthesis of useful chiral building blocks with excellent ee was performed by the catalytic asymmetric acylation of meso-1,3-propanediols. A structurally most simple meso-1,3-propanediol, 2-methyl-1,3-propanediol, was asymmetrized in 96% ee catalyzed by 0.5 mol% of chiral 1,2-diamine.
Novel Acid-Catalyzed Rearrangement of Alkoxycarbonylcycloheptatriene Assisted by Alkoxy Substitution
Authors: Sugimura Takashi , Kagawa Masami , Hagiya Kazutake , Okuyama Tadashi
Published: September 2002

Methoxy substitution was found to promote acid-catalyzed rearrangement of alkoxycarbonylcycloheptatriene in two different ways depending on the catalyst employed.
Enantiopure trans- and cis-3-Aminoindan-1-ols: Preparation and Application as Novel Basic Resolving Agents
Authors: Kinbara Kazushi , Katsumata Yoshiyuki , Saigo Kazuhiko
Published: September 2002

trans- and cis-3-Aminoindan-1-ols were prepared by moderately selective reductions of 3-aminoindan-1-one derivatives and separated into enantiopure forms. The enantiopure trans-isomer had a moderate resolving ability for 2-arylalkanoic acids having a naphthalene ring at the α-position. The X-ray crystallographic analysis showed that an infinite hydrogen-bond sheet was formed in the less-soluble salt, suggesting that the skeleton of these indanols would be favorable for the stabilization of the less-soluble salt by hydrogen-bonding interaction.
Fluoride Ion Abstraction of Phosphonium Cations from Their Counter Anion: A Novel Synthetic Method of Fluorophosphoranes
Authors: Sase Shohei , Kano Naokazu , Kawashima Takayuki
Published: September 2002

The phosphonium cations bearing the Martin ligand abstracted a fluoride ion from their counter anion, tetrafluoroborate, and the corresponding fluorophosphoranes were obtained in good yields.
1,4-Dihydroxylation of 1,3-Conjugated Dienes Promoted by the Pt(III) Dinuclear Complex
Authors: Ochiai Masahiko , Matsumoto Kazuko
Published: September 2002

The pivalamidate bridged platinum(III) dinuclear complex reacted with various linear 1,3-conjugated dienes in water to give the 4-hydroxy-(E)-2-alkenyl-Pt(III) dinuclear complexes. The α-carbon atom of the axial alkenyl ligand bound to the Pt(III) atom is electrophilic and is easily attacked by solvent water to release (E)-2-alkene-1,4-diol exclusively.
Rhodium Catalyzed Anti-Markovnikov Addition of Triphenylphosphine to 1,3-Dienes A Novel Method to Separate Pure (Z)-1,3-Alkadienes from Isomeric Mixtures
Authors: Arisawa Mieko , Momozuka Ryohei , Yamaguchi Masahiko
Published: September 2002

Rhodium-catalyzed addition of triphenylphosphine and trifluoromethanesulfonic acid to (E)-1,3-dienes gives (E)-3-alkenylphosphonium salts in the anti-Markovnikov mode. The addition reactions to (E)-1,3-dienes proceed more rapidly than those to (Z)-1,3-dienes, which can be utilized to separate pure (Z)-1,3-dienes from isomeric mixtures.
Solvent-Free One-Pot Reduction of Imines Generated in situ from Aldehydes and Aniline by Tributyltin Hydride on Silica Gel
Authors: Hiroi Ryoichi , Miyoshi Norikazu , Wada Makoto
Published: September 2002

Imines generated in situ from aldehydes and aniline can be reduced using tributyltin hydride on silica gel under solvent-free conditions to provide the corresponding amines in good yields.
Catalytic Asymmetric Syntheses of ICI-199441 and CP-99994 Using Nitro-Mannich Reaction
Authors: Tsuritani Natsuko , Yamada Ken-ichi , Yoshikawa Naoki , Shibasaki Masakatsu
Published: September 2002

Catalytic asymmetric syntheses of ICI-199441 and CP-99994 were achieved using the nitro-Mannich reaction as a key step.
Enhanced Leaving Ability of Methoxy Group and Retarded Deprotonation on the Carbon Atom Linked to the 1-Position of 8-Phosphino- or 8-Amino-naphthalene
Authors: Toshimitsu Akio , Saeki Tomoyuki , Tamao Kohei
Published: September 2002

In an attempt to lithiate a benzylic carbon, a benzyl methyl ether bearing an 8-phosphino-1-naphthyl group at the benzylic carbon is treated with t-butyllithium to result in the formation of a quite unexpected compound, arising not from deprotonation but from the removal of the methoxy group accompanied by the introduction of two t-butyl groups into the naphthalene ring.
Synthesis of α-Alkylated (Z)-γ-Fluoro-β,γ-enoates through Organocopper Mediated Reaction of γ,γ-Difluoro-α,β-enoates: A Different Reactivity of R3Al-Cu(I) and Me2CuLi
Authors: Okada Midori , Nakamura Yuko , Saito Akio , Sato Azusa , Horikawa Hiroaki , Taguchi Takeo
Published: September 2002

Reaction of γ,γ-difluoro-α,β-enoates having a δ-hydroxyl group with trialkylaluminum (R3Al) in the presence of CuI•2LiCl proceeded in SN2′-type manner to give α-alkylated (Z)-γ-fluoro-β,γ-enoates, while reductive defluorination of γ,γ-difluoro-α,β-enoates with Me2CuLi followed by reaction with alkyl halides provided the corresponding (Z)-α-alkylated products.
Synthesis of Benzocyclooctene Derivatives via Thermal Ring Expansion of Dienylbenzocyclobutenes
Authors: Hamura Toshiyuki , Tsuji Shinsuke , Matsumoto Takashi , Suzuki Keisuke
Published: September 2002

Dienylbenzocyclobutenes, readily available by the cycloaddition of benzyne and ketene silyl actetal followed by addition of dienyllithium, underwent thermal four-carbon ring expansion to give benzocyclooctenone derivatives in high yields. In some cases, acid treatment of the thermal product gave tricyclic ketones via transannular bond formation.
The 5-endo-trig Cyclization of gem-Difluoroolefins with sp3 Carbon Nucleophiles: Synthesis of 1-Fluorocyclopentenes
Authors: Ichikawa Junji , Sakoda Kotaro , Wada Yukinori
Published: September 2002

A disfavored 5-endo-trig cyclization is accomplished in gem-difluoroolefins with sp3 carbon nucleophiles, generated via the lithium–iodine exchange reaction of 1,1-difluoro-5-iodo-1-pentenes with tert-butyllithium, to afford 1-fluorocyclopentenes.
Catalytic Oxidation of Alcohols with Ru(Pybox)(Pydic) Complex
Authors: Iwasa Seiji , Morita Kazushi , Tajima Kentaro , Fakhruddin Ahmad , Nishiyama Hisao
Published: September 2002

Primary and secondary alcohols were catalytically oxidized with diacetoxyiodobenzene in the presence of Ru(Pybox)(Pydic) complex to afford the corresponding aldehydes and ketones in high yields.
A New Condensation Reaction for the Synthesis of Carboxylic Esters from Nearly Equimolar Amounts of Carboxylic Acids and Alcohols Using 2-Methyl-6-nitrobenzoic Anhydride
Authors: Shiina Isamu , Ibuka Ryoutarou , Kubota Mari
Published: September 2002

Various carboxylic esters were obtained in excellent yields with high chemoselectivities from nearly equimolar amounts of carboxylic acids and alcohols using 2-methyl-6-nitrobenzoic anhydride with triethylamine in the presence of a catalytic amount of 4-(dimethylamino)pyridine.
Novel Valence Expansion Reactions Using KC8: A New Route to Hexavalent Organotellurium Compounds from Divalent Tellurium
Authors: Miyasato Masataka , Minoura Mao , Yamamoto Yohsuke , Akiba Kin-ya
Published: September 2002

Hexavalent tellurium compounds, Ar5(CH3)Te, Ar4(CH3)2Te, and Ar2(CH3)4Te (Ar=4-CF3C6H4, Ph, 4-CH3C6H4), were synthesized by the reaction of Ar2-n(CH3)nTe (n=0–1) or Ar3-m(CH3)mTe+X- (m=0–2) with KC8 followed by the treatment with CH3I.
Formation of Cyclopropanes by the Reductive Coupling of 1,3-Dihalides Promoted by Titanocene(II) Species
Authors: Takeda Takeshi , Shimane Keiko , Fujiwara Tooru , Tsubouchi Akira
Published: September 2002

The treatment of various 1,3-dihalides including the ones bearing an ester group with the titanocene(II) species produced cyclopropanes in good yields. The reaction of dihalides possessing two secondary halogens proceeded stereoselectively to afford trans-isomers as major products.
Comparison of Cyclic and Acyclic Phosphites by Selective Phosphorylation. Synthesis of Phosphatidylinositol 4-Phosphate
Authors: Watanabe Yutaka , Munetsugu Hirofumi , Hayashi Minoru
Published: September 2002

To compare the synthetic utility of cyclic xylylene N,N-diethylphosphoramidite and its acyclic analog, dibenzyl ester, both phosphites derived from them with dipalmitoylglycerol were subjected to the selective phosphorylation at the OH-3 position in 1,2:4,5-di-O-cyclohexylidene-myo-inositol in the presence of pyridinium tribromide, and the cyclic version showed to be much superior to the acyclic. The 3-O-phosphorylated product was conveniently converted into phosphatidylinositol 4-phosphate.
Ruthenium-Mediated Domino Sequence Forming Six-Membered Ring Diene from Ene-Yne and Alkene
Authors: Murakami Masahiro , Ubukata Minoru , Ito Yoshihiko
Published: September 2002

A new domino reaction is developed in which a six-membered ring diene is formed in a regio- and stereoselective manner from an ene-yne and an alkene through the mediation of a ruthenium complex.
Application of High Pressure Induced by Water-freezing to the Michael Reaction of Alcohols with α,β-Enones
Authors: Hayashi Yujiro , Nishimura Koichi
Published: September 2002

High pressure (about 200 MPa), which was realized by freezing water in a sealed autoclave, has been successfully applied to a high-yield Michael reaction of alcohols and α,β-unsaturated ketones in the presence of a catalytic amount of DMAP and LiClO4. Only a moderate yield was obtained under atmospheric pressure.
Catalytic, Enantioselective Propargyl- and Allenylation Reactions of α-Imino Ester
Authors: Kagoshima Hirotaka , Uzawa Tetsumaru , Akiyama Takahiko
Published: September 2002

Catalytic, enantioselective propargyl- and allenylation reactions of α-imino ester have been achieved by means of the [Cu(MeCN)4]ClO4/(R)-tol-BINAP catalyst to afford the corresponding propargyl- and allenyl-substituted α-amino acid derivatives, respectively, in good yields with good enantiomeric excesses.
Stereoselective Bifurcating-type Radical Cyclization of gem-Dibromocyclopropanes for the Synthesis of Uniquely Fused 5-3-5-Type Tricyclic Compounds
Authors: Nishii Yoshinori , Fujiwara Atsushi , Wakasugi Kazunori , Miki Misao , Yanagi Kazunori , Tanabe Yoo
Published: September 2002

Bifurcating radical cyclization of gem-dibromocyclopropane derivatives afforded novel fused 5-3-5 type tricyclic products with high 5-exo-trig and transannular mode.
Diastereoselective Additions of Ethynyl Grignard Reagent to Erythrulose Derivatives
Authors: Kobayashi Shoji , Das Parthasarathi , Wang Guang Xing , Mita Takashi , Lear Martin J , Hirama Masahiro
Published: September 2002

Through systematic changes in reaction conditions and in the use of Ti(OiPr)4, the typical stereochemical outcome of ethynylmagnesium bromide on α,β-O-isopropylidene-erythrulose derivatives has been reversed with exceptional levels of control.
Catalytic Asymmetric 1,3-Dipolar Cycloaddition of a Nitrone Bearing a Bulky Amide Moiety to γ-Substituted Allylic Alcohols
Authors: Ding Xia , Ukaji Yutaka , Fujinami Shuhei , Inomata Katsuhiko
Published: September 2002

A catalytic asymmetric 1,3-dipolar cycloaddition reaction of a nitrone possessing diisopropyl amide moiety to γ-substituted allylic alcohols was achieved by using diisopropyl (R,R)-tartrate as a chiral auxiliary to afford the corresponding 3,4,5-trisubstituted isoxazolidines with excellent enantioselectivity up to over 99% ee.
First Aggregation of L-Cysteinato Cobalt(III) Octahedrons Assisted by Trigonal-Planar Silver(I) and Trigonal-Prismatic Sodium(I) Ions
Authors: Konno Takumi , Kawamoto Tatsuya , Kuwabara Rie , Yoshimura Takashi , Hirotsu Masakazu
Published: September 2002

The reaction of ΔL-[Co(L-Hcys-N,S)(en)2](ClO4)2 with NaOH and AgClO4 in a 2:2:1 ratio in water gave a 2:1 (Co:Ag) adduct, (ΔL)2-[Ag{Co(L-cys-N,S)(en)2}2]3+ ((ΔL)2-[1]3+), while the corresponding reaction with AgNO3 led to the isolation of a 3:1 adduct, (ΔL)3-[AgNa{Co(L-cys-N,S)(en)2}3]5+ ((ΔL)3-[2]5+). The discrete trinuclear structure in (ΔL)2-[1]3+ and the 2D polymeric structure in (ΔL)3-[2]5+ were determined by X-ray crystallography.
Chemoselective Substitution Reaction of 2-Bromo-3-methoxy-1,4-naphthoquinone
Authors: Stills Bryanne L , Lauzon Carolyn B , Otsuki Tetsuo
Published: September 2002

Chemoselective substitution reactions of 2-bromo-3-methoxy-1,4-naphthoquinone were studied here. In the reactions of 2-bromo-3-methoxy-1,4-naphthoquinone with a variety of alkylamines, 2-alkylamino-3-bromo-1,4-naphthoquinones resulted in high yields. Alkylthiols, on the other hand, were found to form 2-alkylthio-3-methoxy-1,4-naphthoquinones in their reactions with 2-bromo-3-methoxy-1,4-naphthoquinone in the presence of an amine.
Electrochemical Oscillation in the Oxidation of Tritolylamines Using YBa2Cu3O7-δ Ceramics Electrode in Oxygen Atmosphere
Authors: Tatsumi Masakazu , Isida Yutaka , Ariyama Takayuki , Yano Masafumi
Published: September 2002

The electrochemical redox reaction of tritolylamine isomers was studied using polycrystalline YBa2Cu3O7-δ (YBCO) pellets as electrodes. The oscillatory phenomena in which the anodic electrode of YBCO reacts between oxidation and reduction of the substrate in rapid alternation nonlinearly were observed. The cathodic reaction of YBCO forms cation radical species of the substrate.
Synthesis of Ultrathin Films of Prussian Blue by Successive Ion Adsorption Technique
Authors: Moriguchi Isamu , Kamogawa Haruna , Hagiwara Kaori , Teraoka Yasutake
Published: September 2002

Ultrathin films of Prussian blue (PB) were successfully prepared on substrates by the successive ion adsorption technique that consisted of alternate immersions of a substrate into solutions of Fe2+ and Fe(CN)63-. The PB films showed stable electrochemical redox and electrochromic properties.
Molecular Assembly of Bachteriochlorophyll a Using Light-harvesting Model 1α-Helix Polypeptides and 2α-Helix Polypeptide with Disulfide-linkage
Authors: Nango Mamoru , Kashiwada Ayumi , Watanabe Hiroyuki , Yamada Shuhei , Yamada Taku , Ogawa Makiko , Tanaka Toshiki , Iida Kouji
Published: September 2002

UV-vis. absorption and CD spectral data indicate that the minimum amino acid sequence in the N-terminal segment of the light-harvesting (LH) polypeptides of photosynthetic bacteria necessary for the LH1-type complex-formation was that of the type 2, of our synthetic hydrophobic polypeptides (Scheme 2). Stable BChl a complex in the presence of a 2α-helix polypeptide with disulfide linkage, was obtained in lipid bilayers as well as in n-octyl-β-D-glucopyranoside (OG) micelles, analogous to the subunit complex, B820, of the LH I complex of photosynthetic bacteria.
Conversions of Thiirene 1-Oxides to α-Iminothioketones or Oxazoles through Probable Intermediates Sulfilimines
Authors: Ono Yutaka , Sugihara Yoshiaki , Ishii Akihiko , Nakayama Juzo
Published: September 2002

Three thiirene 1-oxides 1, which possess bulky alkyl substituents at the 2- and 3-positions, afforded α-iminothio-ketones in 59–69% yields on successive treatment with trifluoroacetic anhydride and p-toluenesulfonamide, whereas 1 furnished oxazoles in 65–89% yields on the same treatment with trifluoroacetic anhydride and p-toluamide. A mechanism involving ring-expansion of the initial intermediates, sulfilimines, is proposed for these reactions.
Pressure-induced Metamagnetic Behavior in a Quasi-One-Dimensional Molecule-based Ferrimagnet
Authors: Suzuki Kentaro , Hosokoshi Yuko , Inoue Katsuya
Published: September 2002

Pressure effects on a molecule-based ferrimagnet of [Mn(hfac)2]·(Br-BNO) (1) were studied, where hfac=hexafluoroacetylacetonate and Br-BNO=5-bromo-1,3-bis(N-tert-butylaminoxyl)benzene. At ambient pressure, 1 is a ferrimagnet with TC=5.4 K. We observed the metamagnetic behavior of 1 under pressure.
Sc(OTf)3 Catalyzed Electrophilic Amination of Arenes: An Expeditious Synthesis of Aryl Hydrazides
Authors: Yadav J S , Reddy B V S , Veerendhar G , Rao R Srinivasa , Nagaiah K
Published: September 2002

Arenes react smoothly with diethyl azodicarboxylate in the presence of a catalytic amount of scandium triflate in dichloromethane at ambient temperature to afford the corresponding aryl hydrazides in high yields with high regioselectivity.
Intramolecular Carbostannylation of Allyl- and Vinylstannanes via a Radical Chain Process
Authors: Miura Katsukiyo , Fujisawa Naoki , Saito Hiroshi , Nishikori Hisashi , Hosomi Akira
Published: September 2002

In the presence of Bu3SnH and AIBN, 8-tributylstannyl-6-octen-1-ynes were efficiently cyclized to 2-allyl-1-(tributyl-stannylmethylene)cyclopentanes by intramolecular homolytic allylstannylation. 8-Tributylstannyl-1,6-octadienes as well underwent the radical cyclization in high efficiency. This radical-based method was applicable to the intramolecular vinylstannylation of alkynes and alkenes.
Liquid-Crystalline Assemblies Containing Ionic Liquids: An Approach to Anisotropic Ionic Materials
Authors: Yoshio Masafumi , Mukai Tomohiro , Kanie Kiyoshi , Yoshizawa Masahiro , Ohno Hiroyuki , Kato Takashi
Published: September 2002

Amphiphilic ionic liquid derivatives form self-organized lamellar liquid crystals with room temperature ionic liquids. The ionic conductivities along the smectic layers have been obtained for the samples aligned in the cells with electrodes. The highest value is 4.3×10-2 S cm-1 at 139 °C.
In Situ Insertion of Poly(aniline) into Molybdenum Oxide Layers
Authors: Shao Ke , Ma Ying , Chen Zhao-hui , Ji Xue-hai , Yang Wen-sheng , Yao Jian-nian
Published: September 2002

A one-pot reaction design is proposed in this paper for synthesis of layered polymer/MoO3 materials. The experimental results evidenced the availability of this design. By using acidified ammonium molybdate as precursor of the inorganic hosts and FeCl3 as the oxidizing agent of aniline, layered PANI/MoO3 has been obtained via a one-step coprecipitation route.
Photorefractive Properties of the Isotropic Phase of Cyanobiphenyl Side-chain Liquid Crystalline Polymers
Authors: Sasaki Takeo , Shimada Teruyuki , Tachibana Koji
Published: September 2002

The photorefractive properties of side-chain liquid crystalline polymers possessing cyanobiphenyl chromophores were investigated. The diffraction efficiencies were found to be strongly dependent on temperature. It was found that the refractive index grating persisted after the writing beams were blocked. The persistence of the grating was strongly affected by the length of the alkyl spacer chain that connects the mesogen with the polymer main chain.
Circular Dichroism Measurement of a Protein in Dried Thin Films
Authors: Harada Takunori , Kuroda Reiko
Published: September 2002

Solid-state CD of bovine serum albumin in dry thin films exhibited different spectra depending on the sample preparation method and the rotation positioning of a film. It was revealed that this is due to the macroscopic anisotropies of the samples and not due to the protein conformation transition during the film formation, as suggested in literature.
High Sensitive DNA Detection Amplified by Enlarging Au-Nanoparticles in situ
Authors: Ma Zhanfang , Li Jinru , Jiang Long , Yang Mengsu , Sui Sen-fang
Published: September 2002

A new approach to amplify the micogravimetric quartz crystal microbalance (QCM) assay of DNA by enlarging Au-nanoparticles in situ has been reported. To avoid the interference of the non-specific enlargement effect mercaptoethanol was served as blocking reagent. The results show that the sensitivity of detecting DNA is remarkably increased to ca. 1×10-15 M.
A Novel Shape-Selective Catalyst, Pt-Promoted Rb2.1H0.9PW12O40, for Hydrogenation of Aromatic Compounds
Authors: Yoshimune Miki , Yoshinaga Yusuke , Okuhara Toshio
Published: September 2002

Pt-Promoted Rb2.1H0.9PW12O40 was found to possess uniform micropores with the width of about 0.60 nm and a very small external surface area. This catalyst exhibited sharp shape-selectivity in the hydrogenation of aromatic compounds, distinguishing benzene from m-xylene and 1,3,5-trimethyl-benzene.
An Electrochemical Quartz Crystal Microbalance Study of the Electrochemical Oscillation in H2O2-Reduction Reaction
Authors: Wu Xiaqin , Wang Fang , Jin Long , Li Hexing , Zhang Zongrang
Published: September 2002

Electrochemical quartz crystal microbalance (EQCM) was used to trace the process of the oscillation A and oscillation B appeared in the reduction reaction of hydrogen peroxide in acidic solutions. Good correlation was observed. Only a few frequency shift even remaining constant was observed parallel with the measured oscillation A while the pronounced frequency shift was correlative to the measured oscillation B. Preliminary idea regarding above observation is presented for discussion.
Direct Electrochemistry of Cytochrome c Embedded in Membrane Films of Anionic-Type Lipids Prepared via Ion-Exchange
Authors: Tominaga Masato , Yanagimoto Junko , Nakashima Naotoshi
Published: September 2002

Cytochrome c was embedded in a membrane film composed of anionic-type lipids via ion-exchange. The cytochrome c embedded in lipid films coated on a graphite electrode showed well-defined redox waves. Redox potentials and specular reflectance spectra indicated that the native structure of cytochrome c was retained in the lipid films.
Rotaxane-like Characteristics of [2]Pseudorotaxane Complexes of α-Cyclodextrin and Dodecamethylene Threading Chain Derivatives with Cationic End Groups
Authors: Kim Byeong-Su , Hong Jong-In
Published: September 2002

We have prepared several threading chain molecules that are capable of producing [2]pseudorotaxane complexes with α-CD. The free energy of activation of site exchange (ΔG‡) of [2]pseudorotaxanes indicates that the [2]pseudorotaxanes have increasingly rotaxane-like characteristics as the number of cationic end groups and the steric hindrance of end groups of an axle increase.
Effects of Microwave Absorbents in NO Removal by Microwave Discharge of NO/Ar Mixture at Atmospheric Pressure
Authors: Tsuji Masaharu , Nakano Kosuke , Kumagae Jun , Tsuji Takeshi , Yoon Seong-Ho , Korai Yozo , Mochida Isao
Published: September 2002

The removal of NO has been studied using a microwave-absorbent assisted discharge of an NO/Ar mixture at atmospheric pressure. When carbon fibers (CFs) and a graphite rod were used as absorbents, the conversion of NO increased by factors of 31–71%.
Synthesis of Kinetically Stabilized Silaneselone and Silanetellone
Authors: Tokitoh Norihiro , Sadahiro Tomonori , Hatano Ken , Sasaki Takayo , Takeda Nobuhiro , Okazaki Renji
Published: September 2002

Kinetically stabilized silaneselone [Tbt(Dip)Si=Se (4); Tbt=2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dip=2,6-diisopropylphenyl] and silanetellone [Tbt(Dip)Si=Te] were synthesized by direct chalcogenation of Tbt(Dip)M: (M=Si, Ge) with elemental chalcogen. Deselenation of Tbt(Dip)SiSe2 also gave 4. Metallanetellones [Tbt(Dip)M=Te; M=Si, Ge] were also synthesized by the reaction of Tbt(Dip)MLi2 (M=Si, Ge) with TeCl2, which is a new synthetic method for heavy ketones.
Excited State Structure of N-(4-cyanophenyl)carbazole by Time-Resolved Infrared Absorption Spectroscopy
Authors: Samanta Anunay , Saha Satyen , Ishikawa Hironori , Hamaguchi Hiro-o
Published: September 2002

Nanosecond time-resolved infrared absorption spectroscopy has been used to study the charge transfer characteristics of the title compound in electronically excited states. The transient infrared bands observed at 2090 cm-1 and 2060 cm-1 have been attributed to the CN stretch modes in the first excited singlet and triplet states of the molecule. These frequencies are in conformity with enhanced charge separation in the excited states. Comparison of the present result with the existing data for 4-(N,N-dimethylamino) benzonitrile has indicated that the CN stretch frequency is not a direct measure of the polarity of the excited states of these molecules.
Regenerable Surface Plasmon Resonance (SPR)-based Immunosensor for Highly Sensitive Measurement of Sub-ppb Levels of Benzo(a)pyrene
Authors: Miura Norio , Sasaki Makoto , Sakai Go , Gobi K Vengatajalabathy
Published: September 2002

A regenerable surface plasmon resonance (SPR)-based immunosensor functioning with the indirect competitive immunoreaction of monoclonal antibody between the analyte (antigen) in testing solution and antigen-bovine serum albumin conjugate immobilized on immunoprobe provided a rapid in situ estimation (response time: about 15 min) of benzo(a)pyrene in the concentration range of 0.1–300 ppb.
Influences of A-site Partial Substitution for BaCo0.7Fe0.3O3 Oxide on Perovskite Structure and Oxygen Permeability
Authors: Kinoshita Kazuya , Kusaba Hajime , Sakai Go , Shimanoe Kengo , Miura Norio , Yamazoe Noboru
Published: September 2002

Oxygen permeation property of A-site partially substituted barium cobaltites, A′xBa1-xCo0.7Fe0.3O3-δ (A′=Ba, Pr, Gd, Dy, Y and Yb), were examined. Substitution of Ba by Dy, Y or Yb was found to stabilize cubic perovskite structure even when x remained as small as 0.05. As a result, oxygen permeation through the disks made of these oxides appeared at temperature lower than 500 °C, and reached fairly high levels at elevated temperature.
Chiral Crystallization of a Linear Two-coordinated Palladium(0) Complex Bearing Propeller-shaped Bulky Phosphine Ligands
Authors: Matsumoto Tsuyoshi , Kasai Takeshi , Tatsumi Kazuyuki
Published: September 2002

A linear bis(phosphine) palladium(0) complex with the bulky aryl substituent, tris(2,2″,6,6″-tetramethyl-m-terphenyl-5′-yl (Tmtp), was found to crystallize as a spontaneously resolved homochiral clathrate with toluene molecules.
Dinuclear Copper Complexes of N-(2-Hydroxybenzylidene or 5-Bromo-2-hydroxybenzylidene)-4,6-O-ethylidene-β-D-glucopyranosylamine: Coordination Variation and Structural Diversity
Authors: Sah Ajay K , Rao Chebrolu P , Saarenketo Pauli K , Rissanen Kari , Albada G A van , Reedijk Jan
Published: September 2002

Dinuclear Cu(II) complexes of N-(2-hydroxybenzylidene or 5-bromo-2-hydroxybenzylidene)-4,6-O-ethylidene-β-D-glucopyranosylamine with coordination variation and molecular and lattice structural variations are explored.
Rare Earth Ion Center in Distorted Square Anti-Prism Coordination Environment: A Novel Three-Dimensional Coordination Polymer with Channels
Authors: Haitao Xu , Nengwu Zheng , Xianglin Jin , Ruyi Yang , Zhengquan Li
Published: September 2002

The hydrothermal synthesis and the structure of the coordination polymer [La2(ATPT)3·(H2O)5] (H2O)2 (ATPT=2-aminoterephthalic acid) were reported. The Rare-earth ion center was in the distorted square anti-prism coordination environment. These carboxyl groups linking La3+ ion centers engendered one-dimension channels with pending groups. Guest water molecules in these channels joined these pending groups via hydrogen bond.
Unusual Absorption Spectra Found for Some Phthalocyaninatozinc(II) Complexes Bearing Dendritic Substituents at α Positions
Authors: Kasuga Kuninobu , Matsuura Noriyuki , Inoue Koji , Handa Makoto , Sugimori Tamotsu , Isa Kimio , Nakata Makoto
Published: September 2002

Phthalocyaninatozinc(II) complexes bearing dendritic substituents have been prepared. It was found that their generation number and positions on the phthalocyanine ring caused unusual absorption and emission spectral features.
Cu(II) Coordination Structure in NAD Glycohydrolase from Agkistrodon acutus Venom Studied by EPR Spectroscopy
Authors: Wu Shuang Ding , Xu Xiaolong , Xie Yongshu , Chen Lixin , Chen Zhenlong , Liu Qingliang
Published: September 2002

NAD glycohydrolase (NADase) from Agkistrodon acutus venom and several Cu(II) model complexes was studied by EPR spectroscopy. It was found that three nitrogen atoms may coordinate to Cu(II) ions and these nitrogen atoms might be from the imidazole groups of histidines in NADase molecule.
Highly Ordered Coronene Adlayer on Au(111) Surface Formed in Benzene Solution: In situ Scanning Tunneling Microscopy Study
Authors: Yoshimoto Soichiro , Narita Ryuji , Itaya Kingo
Published: September 2002

The technique of in situ scanning tunneling microscopy (STM) revealed that a highly ordered adlayer of coronene molecules was formed on an Au(111) surface by first immersing the substrate in benzene containing dissolved coronene and then transferring it into an aqueous solution of HClO4.
Synthesis and Ethylene Polymerization Behavior of a New Titanium Complex Having Two Imine–Phenoxy Chelate Ligands
Authors: Suzuki Yasuhiko , Kashiwa Norio , Fujita Terunori
Published: September 2002

A novel (N-benzylidene-2-hydroxy-3,5-di-t-butyl-aniline)2TiCl2 complex was synthesized and investigated for its potential as an ethylene polymerization catalyst in the presence of MAO or Ph3C+B-(C6F5)4/iBu3Al as a cocatalyst. Upon activation with Ph3C+B-(C6F5)4/iBu3Al, the complex displayed higher activities at higher temperatures, and the activity reached a very high value of 5784 kg-PE/mol-Ti·h at 75 °C under atmospheric pressure.
Asymmetric Cyclization via Oxygen Cation Radical: Enantioselective Synthesis of cis-4b,9b-Dihydrobenzofuro[3,2-b]benzofurans
Authors: Masutani Kouta , Irie Ryo , Katsuki Tsutomu
Published: September 2002

Aerobic oxidative cyclization of 2,2′-dihydroxystilbenes via oxygen cation radical to give cis-4b,9b-dihydrobenzofuro[3,2-b]benzofurans was carried out in an enantioselective manner (up to 89% ee) by using (nitrosyl)Ru(salen) 10 as the catalyst under photo-irradiated conditions.
Electrochemistry in Middle Phase Microemulsion Composed of Saline and Toluene with Sodium Dodecylsulfate and n-Butanol
Authors: Yoshitake Shinya , Ohira Akihiro , Tominaga Masato , Nishimi Taisei , Sakata Masayo , Hirayama Chuichi , Kunitake Masashi
Published: September 2002

A “middle phase” microemulsion, which bicontinuously composed of saline and toluene microphases, with sodium dodecylsulfate (SDS) and n-butanol was electrochemically characterized. When electrochemistry was performed in the “middle phase” microemulsion, reversible redox peaks of the Fe(CN)6 ion in the micro water phase and the ferrocene in the micro toluene phase could be observed simultaneously, although the electrolyte was present only in the water phase.
Synthesis, Crystal Structure and Superoxide Dismutase (SOD) Activity of Novel Seven-Coordinated Manganese(II) Complex with Multidentate Di-Schiff Base Ligands
Authors: Ouyang Xing-Mei , Fei Bao-Li , Okamura Taka-aki , Sun Wei-Yin , Tang Wen-Xia , Ueyama Norikazu
Published: September 2002

A novel hepta-coordinated mononuclear manganese(II) complex, [Mn(L)2(H2O)](ClO4)2·2.5H2O [L=1,2-bis(2′-pyridylmethyleneamino)propane], was obtained by assembly reaction of a di-Schiff base ligand L with manganese(II) perchlorate. The crystal structure shows that one of the L ligand acts as a quadridentate ligand, while the other one serves as a bidentate. The Mn(II) complex was found to have activity of dismutation of superoxide (O2·-) in the riboflavin-methionine-nitro blue tetrazolium assay.
Reactions of Silenes Produced Thermally from Pivaloyl- and Adamantoyltris(trimethylsilyl)silane with Bis(trimethylsilyl)butadiyne
Authors: Naka Akinobu , Ishikawa Mitsuo
Published: September 2002

Thermolysis of pivaloyl- and adamantoyltris(trimethylsilyl)silane (1a) and (1b) with bis(trimethylsilyl)butadiyne at 120 °C gave the respective [2+2] cycloadducts. Similar thermolysis of 1a and 1b with bis(trimethylsilyl)butadiyne at 160 °C, however, afforded 2-oxa-1,1,3,5-tetrakis(trimethylsilyl)-4-trimethylsilylethynyl-1-silacyclopent-4-ene derivatives in high yields.
Application of XANES for the Determination of Oxidation States of Co and Pb in Natural Ferromanganese Nodules
Authors: Takahashi Yoshio , Usui Akira , Okumura Kazu , Uruga Tomoya , Nomura Masaharu , Murakami Mio , Shimizu Hiroshi
Published: September 2002

Cobalt K-edge and Pb LIII-edge XANES spectra were obtained by fluorescent XANES using solid state detector (SSD) for Co and Pb in natural rocks, ferromanganese nodules. The XANES spectra suggest that Co(III) and Pb(II) are their main oxidation states in ferromanganese nodules. Based on the results, enrichment mechanisms of Co and Pb in ferromanganese nodules were discussed.
A Novel, One-Pot Synthesis of α-C-Cyanohydrazines in the Presence of Lithium Perchlorate/Diethylether Solution (5.0 M)
Authors: Heydari Akbar , Baharfar Robabe , Rezaie Mohsen , Aslanzadeh Saied M
Published: September 2002

Condensation of N,N-dimethylhydrazine, an aldehyde in lithium perchlorate/diethylether solution (5.0 M) gave N,N-dimethylhydrazone, which were treated with trimethylsilyl-cyanide to afford α-C-cyanohydrazine. These compounds are important precursors of nitrogen-substituted reagents.
Observation of a High Resolution Proton NMR with a 920 MHz Superconducting Magnet
Authors: Hashi Kenjiro , Shimizu Tadashi , Goto Atsushi , Kiyoshi Tsukasa , Matsumoto Shinji , Wada Hitoshi , Fujito Teruaki , Hasegawa Ken-ichi , Yoshikawa Masatoshi , Miki Takashi , Ito Satoshi , Hamada Mamoru
Published: September 2002

We have performed the proton NMR measurements of H2O and ethylbenzene (C6H5–CH2–CH3) using the superconducting magnet operating at 21.6 T (920 MHz for proton) in the persistent mode. It is found that both homogeneity and stability of the magnet have a specification sufficient for a high resolution NMR.
Fabrication of the Sponge-like Layered Silver(I)-alkylamine Complexes and Their in situ Reduction
Authors: Ren N , Tang Y , Wang Y J , Dong A G , Yang W L
Published: September 2002

A series of layer-structured silver(I)-alkylamine complexes with sponge-like morphology and abundant macroporosity were self-assembled in the alcohol/water system. After in situ reduction, the layered silver(0)-alkylamine composites were obtained.
Preparation of Boron-containing TON-Type Zeolite by Self-transformation of Porous Glass in a Vapor Phase
Authors: Dong Wei-Yang , Qiu Xi-Peng , Ren Yu , Long Ying-Cai
Published: September 2002

Pure phase of boron-containing TON-type zeolite with high crystallinity was prepared by self-transformation of porous glass granules in a vapor phase of methylamine and water. XRD and 11B, 27Al and 29Si MAS NMR spectra proved that the atoms of B, Al and Si in the raw glass have been essentially completely incorporated into the zeolite framework.
Water Accelerated Allylation of Aldehydes by Using Water Tolerant Grignard-Type Allylating Agents from Allylmagnesium Chloride and Various Metallic Salts
Authors: Fukuma Tomohiro , Lock Sandra , Miyoshi Norikazu , Wada Makoto
Published: September 2002

Some water-tolerant allylating agents prepared in situ from allylmagnesium chloride and bismuth trichloride, tin tetrachloride, tin dichloride, antimony trichloride, indium trichloride, or nickel dichloride reacted with aldehydes in THF–H2O to afford the desired homoallylic alcohols in good yields. The present reaction proceeded more smoothly than that under non-aqueous media.
Solvent Effect on Morphology of Self-assembled Fibrous Materials Derived From an Azopyridine Carboxylic Acid
Authors: Aoki Ken’ichi , Nakagawa Masaru , Seki Takahiro , Ichimura Kunihiro
Published: September 2002

The macroscopic morphology of fibrous materials deposited from solutions of an azopyridine carboxylic acid dissolved in organic solvents was critically corelated with solvent parameters.
Terpiodiene: A Novel Tricyclic Alcohol from the Okinawan Sponge Terpios hoshinota
Authors: Teruya Toshiaki , Nakagawa Satoru , Koyama Tomoyuki , Suenaga Kiyotake , Uemura Daisuke
Published: September 2002

Terpiodiene (1), a novel tricyclic alcohol, was isolated from the Okinawan sponge Terpios hoshinota, which overgrows and kills corals. Its structure was determined by spectroscopic analysis and the modified Mosher’s method. This compound exhibited moderate cytotoxicity against P388 cells.
Direct Synthesis of Coumarins by Pd(II)-Catalyzed Reaction of Alkoxyphenols and Alkynoates
Authors: Oyamada Juzo , Jia Chengguo , Fujiwara Yuzo , Kitamura Tsugio
Published: September 2002

Reaction of alkoxyphenols and alkynoates in the presence of a catalytic amount of Pd(OAc)2 in trifluoroacetic acid at room temperature gave coumarin derivatives in high yields. This procedure provides a convenient method for direct synthesis of coumarin derivatives under very mild conditions.
Amplification of Detection Signals for Methyl Viologen by Using Supramolecular Formation of Antibody with Viologen Dimer in Surface Plasmon Resonance Sensor
Authors: Yamaguchi Hiroyasu , Harada Akira
Published: September 2002

A new method to amplify detection signals for methyl viologen in surface plasmon resonance (SPR) sensor has been devised by using supramolecular formation of anti-viologen antibodies with divalent viologens.
Preparation and Molecular Arrangement of Novel Pyrenophanes
Authors: Tsuge Akihiko , Tanba Yuji , Moriguchi Tetsuji , Sakata Kazunori
Published: September 2002

A stack and an offset stack geometrical arrangements based on the columnar structure have been confirmed for the molecular packing of novel pyrenophanes consisting of aniline unit or nitrobenzene unit, respectively, in contrast to a herringbone arrangement identified for the pyrenophane having benzene unit. Such a columnar stack arrangement is probably due to weak intermolecular interaction between the pyrene and the opposite aromatic component.
Syntheses of Vinyl Polymers Containing Phenylanthracene Pendants and Their Application ro Organic EL Device
Authors: Shirai Satoshi , Kido Junji
Published: September 2002

Fluorescent vinyl polymers containing 9-phenylanthracene pendants were synthesized and examined as an emitter layer in organic electroluminescent devices. The single layer polymer EL device using the homopolymer emitted green light originating from the excimer of the anthracene units. On the other hand, blue emission was observed from the devices using the copolymer with vinylcarbazole.
meso-Tetraphenylporphyrin Having Hexa-maltosyl and Decyl Chain as an Amphiphilic Photosensitizer toward Photodynamic Therapy
Authors: Hamazawa Akihisa , Kinoshita Isamu , Breedlove Brian , Isobe Kiyoshi , Shibata Minako , Baba Yasuko , Kakuchi Toyoji , Hirohara Shiho , Obata Makoto , Mikata Yuji , Yano Shigenobu
Published: September 2002

meso-Tetraphenylporphyrin having hexa-maltosyl and decyl chain was synthesized via dipyrromethane coupling. Its singlet oxygen producing ability and phototoxicity against the HeLa cell were estimated.
Novel Activity of SnO2 for Methanol Conversion: Formation of Methane, Carbon Dioxide, and Hydrogen
Authors: Mori Tohru , Hoshino Shunichi , Neramittagapong Arthit , Kubo Jun , Morikawa Yutaka
Published: September 2002

SnO2 catalyzed methanol conversion to form methane, carbon dioxide and hydrogen selectively. It was suggested that formaldehyde was an intermediate to give methyl formate that readily decomposed into methane and carbon dioxide.
Catalytic and Stereoselective Glycosylation with a Novel and Efficient Disarmed Glycosyl Donor: Glycosyl p-Trifluoromethylbenzylthio-p-trifluoromethylphenyl Formimidate
Authors: Mukaiyama Teruaki , Chiba Hiroyuki , Funasaka Setsuo
Published: September 2002

A novel and efficient glycosyl donor having a p-trifluoro-methylbenzylthio-p-trifluoromethylphenyl formimidate function as a leaving group is easily prepared by the addition of anomeric hydroxyl group of 2,3,4,6-tetra-O-benzoyl-α,β-D-glucopyranose to p-trifluoromethylphenyl isothiocyanate, followed by treatment with p-trifluoromethylbenzyl bromide. Catalytic and stereoselective glycosylation using this glycosyl donor effectively proceeds by activating its nitorogen atom with various protic and Lewis acids.
Synthesis and Single Aggregate Spectroscopy of a Novel Fluorescent Dendrimer with Highly Efficient Energy Harvesting
Authors: Kobayashi Minoru , Machida Shinjiro , Takahashi Satoshi , Horie Kazuyuki , Yoshikawa Hiroyuki , Masuhara Hiroshi
Published: September 2002

A novel fluorescent dendrimer with a diphenylanthracene core and pyrenyl groups in the dendrons was synthesized. Fluorescence spectra and its decay curves proved spontaneous energy transfer from the pyrene units to the core diphenylanthracene, which was ascertained both in solution and for a single particle of the dendrimer aggregate.
A New Chelation-Assistance Mode for a Ruthenium-Catalyzed Silylation at the C-H Bond in Aromatic Ring with Hydrosilanes
Authors: Kakiuchi Fumitoshi , Igi Kimitaka , Matsumoto Mitsutaka , Hayamizu Tomoo , Chatani Naoto , Murai Shinji
Published: September 2002

Ruthenium-catalyzed reactions of aromatic compounds having an amino group or a heteroaromatic ring as a directing group with triethylsilane gave the corresponding ortho silylated products in good to excellent yields. In contrast to our previous results, in which the reactive substrates with π-conjugation between the hetero atom in the directing group and the carbon atom possessing the C-H bond to be cleaved were used, the present reaction proceeds in cases of substrates having no such π-conjugation.
Non-aqueous Synthesis and Structure of a Novel Monodimensional Zirconium Phosphate: [NH4]3[Zr(OH)2(PO4)(HPO4)]
Authors: Wang Dan , Yu Ranbo , Takei Takahiro , Kumada Nobuhiro , Kinomura Nobukazu , Onda Ayumu , Kajiyoshi Koji , Yanagisawa Kazumichi
Published: September 2002

A novel one-dimensional zirconium phosphate inorganic polymer, [NH4]3[Zr(OH)2(PO4)(HPO4)] has been synthesized in (HOCH2CH2)2O medium with F- ions in presence, and structurally characterized. The compound consists of macroanionic chains of [ZrP2O10H3]3- separated by NH4+ cations.