bluuebunny/crossref_metadata_2025_split huggingface dataset:
Decomposition of Polytetrafluoroethylene by Grinding with Strontium Oxide
Authors: Zhang Qiwu , Matsumoto Hiroki , Saito Fumio 
Published: September 2002

Abstract
Polytetrafluoroethylene (PTFE) was ground with SrO using a planetary ball mill in air. The grinding stimulates the solid reaction between PTFE and SrO at room temperature. PTFE is decomposed by the solid reaction and fluorine in PTFE is transformed into strontium fluoride. The results show that it is possible to mineralize highly stable polymer PTFE by grinding with proper additive.
A Mild and Efficient Oxidation of Alcohols with N-tert-Butylphenylsulfinimidoyl Chloride in the Coexistence of Zinc Oxide
Authors: Matsuo Jun-ichi , Kitagawa Hideo , Iida Daisuke , Mukaiyama Teruaki 
Published: September 2002

Abstract
Various primary and secondary alcohols bearing β-aryl, alkenyl, or alkoxy moiety were efficiently oxidized to the corresponding labile aldehydes and ketones under mild conditions with N-tert-butylphenylsulfinimidoyl chloride (1) in the coexistence of zinc oxide.
A Convenient Synthetic Route to Gold Nanoparticles Dispersed within Mesoporous Silica
Authors: Chen Wei , Cai Weiping , Zhang Zhongpin , Zhang Lide 
Published: September 2002

Abstract
A sonochemical procedure at room temperature for the preparation of gold (Au) nanoparticles loaded in mesoporous silica is described. It has been shown that the Au nanoparticles, with mean size of 3–4 nm in diameter and a fairly narrow size distribution, are dispersed uniformly within the pores of silica host.
Preparation and Vibrational Properties of BiI3 Nanocrystals
Authors: Wang Chunrui , Yang Qing , Tang Kaibin , Qian Yitai 
Published: September 2002

Abstract
Nanocrystalline BiI3 with average size of 10–20 nm is prepared by a hydrothermal method at 180–200 °C for the first time. The vibrational properties of as-prepared BiI3 were investigated by the Raman spectra at room temperature.
Electron Paramagnetic Resonance Study of Positive-Hole Pairs on Oxide Ions in Lithium Bismuthate Glass
Authors: Watanabe Tomohiro , Nanba Tokuro , Miura Yoshinari 
Published: September 2002

Abstract
The electron paramagnetic resonance signals attributed to the triplet state of the positive-hole pairs on oxide ions are observed in (100−x) Bi2O3·x Li2O glass (x = 25, 30, 35 mol%). So far as we know, this is the first experimental observation of the triplet oxygen hole center in oxide glasses.
Studies on the Transport of Lanthanides Ions through the Membrane of Human Erythrocyte in vitro by ICP-MS
Authors: Zheng Yu-juan , Lu Jun , Ding Lan , Chen Hang-ting , Zhao Da-qing 
Published: September 2002

Abstract
A method was developed for the determination of lanthanum in the cytoplasm of human erythrocytes after they were incubated in lanthanum nitrate or citrate solutions. The lanthanum concentration in the cytoplasm of incubated erythrocytes is much higher than that in normal erythrocytes. It is suggested lanthanum can transport through the membrane of erythrocyte in vitro. Solutions containing chelator are unsuitable to be washing buffer in the investigation.
Pd(en) as a Sequence-Selective Molecular Pinch for α-Helical Peptides
Authors: Hamachi Itaru , Kasagi Noriyuki , Kiyonaka Shigeki , Nagase Tsuyoshi , Mito-oka Yasuko , Shinkai Seiji 
Published: September 2002

Abstract
A palladium(II)(ethylenediamine) complex was found to selectively stabilize α-helix conformation of peptides having two histidine (His) residues at i and i + (3 or 4) positions, whereas the helix conformation of the other peptides having one or two His at different positions is destabilized.
Fabrication and Characterization of Gold–Platinum Black Electrode
Authors: Toyama Shigeru , Someya Masayuki , Takei Osamu , Ohtake Toshihito , Usami Ron , Horikoshi Koki , Ikariyama Yoshihito 
Published: September 2002

Abstract
Gold–platinum black layer was electrochemically deposited on a platinum electrode in the mixed solution of tetrachloroaurate, hexachloroplatinate, and lead acetate. The surface of the electrode after the deposition was characterized by scanning electron microscopy, X-ray microanalysis, and cyclic voltammetry. There was no evidence of the localization of gold and platinum, and the deposition ratio of gold and platinum was proportional to the concentration of tetrachloroaurate and hexachloroplatinate.
A Novel Organic Conductor with Two-Dimensional Molecular Array by the “Edge-to-Edge” Donor Interaction
Authors: Takahashi Kazuyuki , Nakayashiki Takashi , Taniguchi Masateru , Misaki Yohji , Tanaka Kazuyoshi 
Published: September 2002

Abstract
The title donor, where SM-PDT is 2-[4,5-bis(selenomethyl)-1,3-dithiol-2-ylidene]-5-(pyran-4-ylidene)-1,3,4,6-tetrathiapentalene, formed semiconducting 1:1 salts with various anions. The crystal structure analysis of (SM-PDT)PF6(PhCl)x has revealed that an edge-to-edge chalcogen interaction gave two-dimensional sheet-like structure.
Oxidation of Urazoles to Triazolinediones with Benzyltriphenylphosphonium Peroxymonosulfate under Solvent-Free Conditions
Authors: Hajipour Abdol Reza , Mallakpour Shadpour E , Adibi Hadi 
Published: September 2002

Abstract
Benzyltriphenylphosphonium peroxymonosulfate (PhCH2Ph3PHSO5) in the presence of AlCl3 was used as an effective oxidizing reagent for the oxidation of urazoles to their corresponding triazolinediones in high yields under solvent-free conditions.
Geminal Bond Participation in the Sigmatropic [1,5]-Hydrogen Shifts: Relative Reactivities of Z- and E-1-Substituted 1,3-Pentadienes
Authors: Ikeda Hirotaka , Ushioda Nobuo , Inagaki Satoshi 
Published: September 2002

Abstract
The analysis of the bond interactions at the transition states of the sigmatropic [1,5]-hydrogen shift of 1,3-pentadiene showed the significant participation of the σ bonds geminal to the reacting centers. The electron-donating σ bonds at the Z-positions in the 1-substituted 1,3-pentadienes were predicted to enhance the reactivities rather than those at the E-positions. The predictions of the relative reactivities of the Z- and E-isomers were confirmed by the calculated activation energies by the density functional theory calculations.
Syntheses and Crystal Structures of Novel Di- and Trinuclear Rhodium Complexes Bridged by Pyrazine
Authors: Yu Xiao-Yan , Maekawa Masahiko , Kondo Mitsuru , Kitagawa Susumu , Jin Guo-Xin 
Published: September 2002

Abstract
Novel di- and trinuclear Rh complexes, [Rh2(PPh3)4(H)4(Me2CO)2(µ-pyz)](ClO4)2·EtOH and [Rh3(PPh3)6(µ-pyz)3](ClO4)3·EtOH were selectively isolated from the reaction of [Rh(PPh3)2(H)2(Me2CO)(EtOH)]ClO4 with pyrazine (pyz) in Me2CO and THF, respectively. Their structures were crystallographically characterized.
A Stepwise Growth of Polyoxovanadate by Reductive Coupling Reaction with Organometallic Palladium Complex: Formation of [{(η3-C4H7)Pd}2V4O12]2−, [V10O26]4− and [V15O36(Cl)]4−
Authors: Hayashi Yoshihito , Miyakoshi Noboru , Shinguchi Takayuki , Uehara Akira 
Published: September 2002

Abstract
The three step synthesis of pentadecavanadate, (n-Bu4N)4[V15O36(Cl)] has been achieved by a stepwise growth process. The reaction of (n-Bu4N)VO3 with [(η3-C4H7)PdCl]2 gives a tetravanadate supported organometallic compound [{(η3-C4H7)Pd}2V4O12]2−. The thermal decomposition of [{(η3-C4H7)Pd}2V4O12]2− leads to the formation of reduced species [V10O26]4−, which is then converted into a larger cluster [V15O36(Cl)]4−.
The First Total Synthesis of a Macrocyclic Anti-protozoan, LL-Z1640-2
Authors: Tatsuta Kuniaki , Takano Satoko , Sato Toshimitsu , Nakano Satoshi 
Published: September 2002

Abstract
Anti-protozoan, LL-Z1640-2 has been stereoselectively synthesized from d-ribose through Sonogashira coupling, Tsuji hydrogenolysis, and Mukaiyama lactonization.
Nickel(II)-Catalyzed Dialkylation of Aromatic Aldehydes with Organozinc Reagents
Authors: Hu Yulai , Wang Jin-Xian , Li Wenbo 
Published: September 2002

Abstract
A novel reaction of the dialkylation of arylaldehydes is provided. The reaction of substituted aromatic aldehyde with organozinc halides in the presence of catalytic amount of Ni(acac)2 and a tertiary amine using a silylating agent to give 1-alkyl-1-arylalkanes in satisfactory yields.
Kohamaic Acids A and B, Novel Cytotoxic Sesterterpenic Acids, from the Marine Sponge Ircinia sp.
Authors: Kokubo Susumu , Yogi Kentaro , Uddin Md Jasim , Inuzuka Toshiyasu , Suenaga Kiyotake , Ueda Katsuhiro , Uemura Daisuke 
Published: September 2002

Abstract
Two new sesterterpenic acids, which exhibited moderate cytotoxicity, were isolated from the marine sponge Ircinia sp. Their absolute stereochemistries were determined by spectroscopic and chemical analyses. Their configurations at C15 were different from those of previously isolated sesterterpenes. This result suggests the existence of a (14Z)-geranylfarnesyl pyrophosphate, which is yet unknown in nature.
Unusual Oxidation of Oxo-peroxomolybdenum(VI) Tetramesitylporphyrin Giving Molybdenum(V) Porphyrin and Dioxygen
Authors: Fujihara Tetsuaki , Myougan Kazuhiro , Ichimura Akio , Sasaki Yoichi , Imamura Taira 
Published: September 2002

Abstract
The one-electron oxidation of MoVIO(tmp)(O2) gave a product with reduced metal ion, oxomolybdenum(V) tetramesitylporphyrin, by releasing O2.
Indium(III) Chloride Catalyzed Allylation of gem-Diacetates: A Facile Synthesis of Homoallyl Acetates
Authors: Yadav J S , Reddy B V Subba , Madhuri Ch , Sabitha G 
Published: September 2002

Abstract
Indium(III) chloride is found to catalyze efficiently the allylation of gem-diacetates with allyltrimethylsilane at room temperature to afford the corresponding homoallylic acetates in high yields with good regioselectivity.
Photoelectrochemical Cells Made from SnO2/ZnO Films Sensitized with Eosin Dyes
Authors: Kumara G R Asoka , Konno Akinori , Tennakone Kirthi 
Published: September 2002

Abstract
Photoelectrochemical cells have been constructed with SnO2/ZnO, SnO2, ZnO and TiO2 films sensitized with eosin Y (sodium salt and triethyl ammonium salt). SnO2/ZnO composite system gives a significantly high short-circuit photocurrent and an efficiency compared to the cells made from SnO2, ZnO or TiO2. It is suggested that the recombination is better suppressed in the composite system and a possible mechanism involved is discussed.
Room Temperature Molten Salts Based on Tetraalkylammonium Cations and Bis(trifluoromethylsulfonyl)imide
Authors: Matsumoto Hajime , Kageyama Hiroyuki , Miyazaki Yoshinori 
Published: September 2002

Abstract
Symmetric and aliphatic tetralkylammonium cations (QA) form room temperature molten salts (RTMS) with bis(trifluoromethylsulfonyl)imide (TFSI). Tetrapentylammonium (TPA) is the smallest cation to form RTMS with TFSI. The viscosity and the specific conductivity of TPA-TFSI at 25 °C are 430 mPa·s and 0.154 mS·cm−1, respectively. This is the first report of the preparation of RTMS based on symmetric QA.
Wavelength Dependent Regioselective E(trans)→Z(cis) Photoisomerization in Anthryldienes
Authors: Reddy M Janaki Ram , Rao G Venugopal , Bushan K Mani , Reddy Maruthi Janaki Ram , Gopal V Raj , Rao V Jayathirtha 
Published: September 2002

Abstract
Anthryldiene derivatives carrying electron withdrawing end group displayed wavelength dependant regio selective E(trans) → Z(cis) isomerization from the singlet excited state. Fluorescence studies indicated the highly polarized/charge-transfer nature of the singlet excited state.
New Silica-Pillared Layered Titanoniobate Supported Cu Catalysts for the Direct Decomposition of NO
Authors: Wang Xueguang , Hou Wenhua , Yan Qijie 
Published: September 2002

Abstract
Silica-pillared layered titanoniobate supported Cu catalysts have been prepared and showed high and relatively stable activity for the direct decomposition of NO (0.1 vol% in helium) in the space velocity range of 3000–30000 cm3 g−1 h−1.
Magnesium Bromide Diethyl Etherate Mediated Highly Diastereoselective Aldol Reaction between an Aldehyde and a Silyl Enol Ether
Authors: Fujisawa Hidehiko , Sasaki Yasuhiro , Mukaiyama Teruaki 
Published: September 2002

Abstract
High yield and excellent diastereoselectivity in the formation of methyl (2R, 3R, 5R, 6S)-2,6-dibenzyloxy-7-(t-butyldimethylsiloxy)-3-hydroxy-5-(4-methoxybenzyloxy)-4,4-dimethylheptanoate 3 and methyl (2R, 3R, 4S)-2,4-dibenzyloxy-3-hydroxypentanoate 7 are achieved by aldol reaction between (Z)-2-benzyloxy-1-methoxy-1-(trimethylsiloxy)ethene 1 and chiral alkoxy aldehydes using three equivalents of MgBr2·Oet2. The following mechanism of the above aldol reaction proposes that MgBr2·Oet2 activated both chiral alkoxy aldehydes and silyl enolate, that is, magnesiumu enolate, formed by transmetalation from silyl enolate and MgBr2·Oet2, reacted with MgBr2·Oet2-chelated alkoxy aldehydes via the six-membered cyclic transition state.
A New Ring-Forming Methodology for the Synthesis of Conformationally Constrained Bioactive Molecules
Authors: Papahatjis Demetris P , Nikas Spyros , Tsotinis Andrew , Vlachou Margarita , Makriyannis Alexandros 
Published: September 2002

Abstract
A new, general, one pot method for introducing carbocyclic rings alpha to a nitrile moiety is described. Treatment of readily available arylacetonitriles with potassium bis(trimethylsilyl)amide and subsequent alkylation with α, ω-dibromo or dichloroalkanes in tetrahydrofuran under anhydrous conditions at 0 °C produces cycloalkyl adducts in good yields and short reaction times.
V-MCM-41 for Selective Oxidation of Propane to Propene and Acrolein
Authors: Zhang Qinghong , Wang Ye , Ohishi Yoshihiko , Shishido Tetsuya , Takehira Katsuomi 
Published: September 2002

Abstract
The V-MCM-41 with lower V content catalyzes the oxidation of propane to acrolein with a yield of 3.3% and selectivity of 20%, while that with higher V content mainly produces propene.
Pu Sorption to Activated Conglomerate Anaerobic Bacteria
Authors: Sasaki Takayuki , Kudo Akira 
Published: September 2002

Abstract
The sorption of Pu to the anaerobic bacteria activated under specific conditions of temperature, pH and depleted nutrients after long dormant period was investigated. After 4 h at neutral pH, the distribution coefficient (Kd) between bacteria and aqueous phase at 308 and 278 K had around 103 to 104. After over 5 days, however, the Kd at only 308 K had increased to over 105. Sterilized (dead) and dormant anaerobic bacteria adsorbed Pu to the same extent.
Temperature Dependence of the Anomalous Conformational Behavior of a Short-Chain Poly(oxyethylene) in Water Studied by Raman Spectroscopy
Authors: Wahab Shaheda A , Matsuura Hiroatsu 
Published: September 2002

Abstract
The Raman spectra of aqueous solutions of CH3(OCH2CH2)3OCH3 were measured for mole fractions 0.002–0.06 at five temperatures between 5 and 45 °C. The population of the gauche conformation around the C–C bond shows its maximum at about 0.01 mole fraction. The appearance of the maximum is less prominent at higher temperatures. The observed conformational behavior is consistent with the results of molecular dynamics simulations.
The First Three-Leg Ladder Coordination Polymer: [Zn3(Oac)4(4,4′-bpy)3{N(CN)2}2]
Authors: Sun Bai-Wang , Gao Song , Wang Zhe-Ming 
Published: September 2002

Abstract
The coordination polymer [Zn3(Oac)4(4,4′-bpy)3{N(CN)2}2] is prepared and characterized by X-ray diffraction studies, which shows a unique three-leg molecular ladder structure.
Cooperation of the Ce(IV)/EDTA Complex and Oligoamine for Prompt Scission of DNA
Authors: Sumaoka Jun , Igawa Tomoyuki , Yagi Tatsunori , Komiyama Makoto 
Published: September 2002

Abstract
DNA hydrolysis by the Ce(IV)/EDTA complex is enormously accelerated by the cooperation with selected oligoamines. The reaction in the presence of ethylenediamine (100 mmol dm−3) is 50 times as fast as that in its absence.
Low-Temperature Poling of Dye-Doped Polymers for Nonlinear Optical Devices
Authors: Matsushima Ryoka , Tanaka Nobuki , Sugihara Okihiro , Okamoto Naomichi 
Published: September 2002

Abstract
By repeating the corona poling process for several times, dye-doped polymer films were efficiently poled at temperatures significantly lower than Tg. High second-order NLO efficiency (e.g., d33 around 100 pm/V) was obtained with a guest dye, 2-(p-diethylaminocinnamilidene)-indan-1, 3-dione.
Polynuclear Aromatic Thiophenes in the Murchison Carbonaceous Chondrite
Authors: Shimoyama Akira , Katsumata Hideyuki 
Published: September 2002

Abstract
The Murchison carbonaceous chondrite was analyzed for polynuclear aromatic thiophenes in organic solvent extract. Benzothiophene, dibenzothiophene and their methyl derivatives, and benzonaphtothiophenes were detected in concentration at levels of ten and hundred-pmol g−1. The abundance pattern of these thiophenes in the chondrite was markedly different from those in the two kinds of terrestrial sediments, indicating abiotic origin of these thiophenes.
Microscopic Fluorescence Measurement of Fast Interfacial Complexation by Two-Phase Sheath Flow Method
Authors: Tokimoto Takahira , Tsukahara Satoshi , Watarai Hitoshi 
Published: September 2002

Abstract
To measure fast reaction processes of the ms order at the interfacial region in the solvent extraction system, we invented a new method using a micrometer-sized two-phase sheath flow system and a laser-induced fluorometry. The reaction between Zn2+ with 5-octyloxymethyl-8-quinolinol (Hocqn) in the 1-butanol/water system was examined. The fluorescence intensity of Zn2+-ocqn complex, which increased along the inner organic phase flow, gave the complexation rate of Zn2+ with Hocqn.
GdBO3:Eu Phosphor Particles with Uniform Size, Plate Morphology, and Non-Aggregation
Authors: Wang Yuhua , Uheda Kyota , Takizawa Hirotsugu , Endo Tadashi 
Published: September 2002

Abstract
GdBO3:Eu vaterite type particles with fine size, plate morphology, and non-aggregation were first prepared by the mild hydrothermal method. Their characteristics were investigated and compared with those of particles prepared by solid state reactions. The result showed that the hydrothermal method appears to be applicable to prepare high quality phosphors for practical uses. This conclusion was reinforced by the existence of an important improvement in the photoluminescent performances.
A New Organic Anion Consisting of the TEMPO Radical for Organic Charge-Transfer Salts: 2,2,6,6-Tetramethylpiperidinyloxy-4-sulfamate (TEMPO-NHSO3−)
Authors: Akutsu Hiroki , Yamada Jun-ichi , Nakatsuji Shin’ichi 
Published: September 2002

Abstract
The title organic anion was prepared as its tetraphenylphosphonium salt, (Ph4P)(TEMPO-NHSO3), which reacted with (TTF)3(BF4)2 to give (TTF)(TEMPO-NHSO3), which shows the Curie–Weiss behavior (C = 0.360 emu K mol−1 and θ = −0.52 K) with weak antiferromagnetic interaction. This magnetic behavior is found to be attributed to the TEMPO radical.
The First Total Synthesis of Grandinal, a New Phloroglucinol Derivative Isolated from Eucalyptus grandis
Authors: Matsumoto Takuya , Singh Inder Pal , Etoh Hideo , Tanaka Hitoshi 
Published: September 2002

Abstract
The first total synthesis of grandinal (1) is accomplished by biomimetic cycloaddition of the jensenone derivative (2) and the o-quinone methide (3) generated by oxidation of grandinol (4).
A Selective Synthesis of Biphenyl by the Pd(Oac)2/MoO2(acac)2/O2/AcOH Catalyst System
Authors: Okamoto Makoto , Yamaji Teizo 
Published: September 2002

Abstract
A high selectivity of biphenyl (88%) was attained by the Pd-catalyzed dimerization of benzene in the presence of O2 and acetic acid when MoO2(acac)2 was used as a cocatalyst. Various Mo compounds gave high selectivities of biphenyl (82–87%).
The First Mixed-Valence CoIICoIII One-dimensional Chain Coordination Polymer: Synthesis and Structure of [CoII2CoIII(nta)2(azpy)4(H2O)6]·[CoIICoIII(nta)2(azpy)2(H2O)2]·4H2O (nta=Nitrilotriacetate and azpy= 4, 4′-Azobispyridine)
Authors: Li Baolong , Liu Huibiao , Xu Yan , Yin Gui , Chen Jiutong , Xu Zheng 
Published: September 2002

Abstract
A novel mixed-valence CoIICoIII complex [CoII2CoIII(nta)2(azpy)4(H2O)6]·[CoIICoIII(nta)2(azpy)2(H2O)2]·4H2O was synthesized and characterized. Its structure is composed of new motifs, called “the rod with open sidearms” anion and H-like trinuclear cation, which interlock each other. The stack of one-dimensional chains of [CoIICoIII(nta)2(azpy)2(H2O)2] forms two-dimensional rhombus pores through π–π stacking interaction of pyridyl rings from azpy.
CH4 Deep Oxidation on SnO2-Based Composite Oxides: Novel, Active, and Stable Catalysts
Authors: Wang Xiang , Xie You-chang 
Published: September 2002

Abstract
SnO2-based composite oxides containing Fe and Cr were prepared using the combination of redox reaction and co-precipitation, and studied for CH4 deep oxidation. It was found that Fe and Cr were incorporated into SnO2 (Cassiterite) to form some catalysts that are more active and far more resistant to thermal sintering than pure SnO2. Solid solution structure is possibly formed in these catalysts.
Specific Reactivity of the Carbon Filaments Formed by Decomposition of Methane over Ni/SiO2 Catalyst: Gasification with CO2
Authors: Takenaka Sakae , Otsuka Kiyoshi 
Published: September 2002

Abstract
Carbon filaments formed by the decomposition of methane over Ni/SiO2 catalyst are converted efficiently with conversions &gt; 91% into CO by gasification with CO2.
Decomposition of CO2 into CO and O in a Microwave-Excited Discharge Flow of CO2/He or CO2/Ar Mixtures
Authors: Tsuji Masaharu , Tanoue Takeshi , Nakano Kousuke , Nishimura Yukio 
Published: September 2002

Abstract
Decomposition of CO2 in a fast electric discharge flow of CO2/He or CO2/Ar mixtures was studied by observing UV and visible emission spectra. The decomposition efficiency of CO2 in CO2/Ar mixtures was higher than that in CO2/He mixtures. More than 90% of CO2 in CO2/Ar mixtures was selectively decomposed into CO and O at a microwave power of 100-200 W, and CO2 and Ar flow rates of 25 and 1000 sccm, respectively, at a total pressure of 0.5 Torr.
Fabrication of Rutile TiO2 Foils with High Specific Surface Area via Heterogeneous Nucleation in Aqueous Solutions
Authors: Yamabi Satoshi , Imai Hiroaki 
Published: September 2002

Abstract
Rutile TiO2 foils with high specific surface area were fabricated through heterogeneous nucleation on substrates in acidic aqueous solutions of titanyl sulfate. Rutile crystals were directly deposited even at a near room temperature in the solutions at the conditions around the boundary between the Ti(IV) soluble species and the TiO2 crystal in the phase stability diagram of the Ti(IV)-H2O system.
Catalytic and Stereoselective Glycosylation with Glycosyl Fluoride Using Active Carbocationic Species Paired with Tetrakis(pentafluorophenyl)borate or Trifluoromethanesulfonate
Authors: Yanagisawa Manabu , Mukaiyama Teruaki 
Published: September 2002

Abstract
Catalytic and stereoselective glycosylation with glycosyl fluoride using carbocationic species paired with tetrakis(pentafluorophenyl)borate [B(C6F5)4−] or trifluoromethanesulfonate (TfO−) is investigated. When the glycosylation is carried out using the former catalyst in dichloromethane containing tBuCN, the major product is β-glycoside while α-selectivity is observed when the latter catalyst in dichloromethane containing Et2O is used. In addition to the characteristic properties of the solvent, the nature of the counter anion such as B(C6F5)4− or TfO− plays important roles in controlling the selectivity. Thus, an appropriate combination of catalyst and solvent leads to the formation of disaccharides.
Asymmetric Oxidation of Sulfide to Sulfoxides on Ti-Containing Mesoporous Silica Catalysts with Hydrogen Peroxide in the Presence of Optically Active Tartaric Acid
Authors: Iwamoto Masakazu , Tanaka Yasuhiro , Hirosumi Jiro , Kita Nozomu 
Published: September 2002

Abstract
On Ti-containing MCM-41 prepared by a template ion- exchange method, sulfide could be asymmetrically oxidized to sulfoxides in the presence of optically active tartaric acid (54% yield and 30% ee). The oxidation was composed of the asymmetric induction to sulfoxides and the subsequent kinetic resolution of sulfoxides.