bluuebunny/crossref_metadata_2025 huggingface dataset:
INCLUSION OF FERROCENECARBOXYLIC ACID AND ITS CARBOXYLATE ANION BY β-CYCLODEXTRIN AS OBSERVED BY INDUCED CIRCULAR DICHROISM
Authors: Kobayashi Nagao , Osa Tetsuo
Published: July 2006

Induced circular dichroism (i.c.d.) has revealed that the arrangements of ferrocenecarboxylic acid (FCA) and its carboxylate anion (FCA−) in β-cyclodextrin (β-CDx) are significantly different from each other. Based on the previously accummulated knowledge on i.c.d., the orientation of FCA and FCA− in β-CDx is conjectured to be different by almost 90 degree in the X-Z plane, provided that the positions of these species in β-CDx cavity are the same.
TRIDECALINO-18-CROWN-6. SYNTHESIS OF CYLINDRICAL CROWN ETHER
Authors: Kobiro Kazuya , Takahashi Mitsuru , Takada Shigeki , Kakiuchi Kiyomi , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

Tridecalino-18-crown-6 being a new type of cylindrical crown ether has been synthesized and found to exhibit high complexing selectivity for K+/Na+ as well as high complexing ability for K+.
GENERATION OF ORGANIC CONDUCTING PATTERNS ON SEMICONDUCTORS BY PHOTOELECTROCHEMICAL POLYMERIZATION OF PYRROLE
Authors: Okano Mitsutoshi , Itoh Kiminori , Fujishima Akira , Honda Kenichi
Published: July 2006

Photoelectrochemical polymerization of pyrrole occurs at irradiated areas of semiconducting electrodes in aqueous solution of pyrrole. Organic conducting polypyrrole patterns were formed on semiconductors by area-selective irradiation of the semiconductor electrodes. The deposition rate was 0.5–0.7 μm per 100 mC. The conductivity of the deposited polypyrrole film was ca. l S cm−1
CYCLOADDITIONS TO KETENE-S,N-ACETALS. NEW SYNTHESES OF BENZO[b]- AND NAPHTHO[1,2-b]FURANS, 1-BENZ-AND NAPHTH[1,2-b]OXEPININS, AND BENZ[b]FURAN-2-ONES
Authors: Takahata Hiroki , Anazawa Akira , Moriyama Keiko , Yamazaki Takao
Published: July 2006

Annulation of ketene-S,N-acetal with 1,4-quinones gave benzo [b]- and naphtho[1,2-b]furans which were converted to 1-benz- and naphth[1,2-b]oxepins and benzo[b]furan-2-ones.
AN ALTERNATIVE SYNTHESIS OF (±)-DESCARBOXYQUADRONE
Authors: Kakiuchi Kiyomi , Ue Masaki , Tadaki Toshihiro , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

The alternative synthesis of descarboxyquadrone by using the acid-catalyzed rearrangement of [4.3.2]propellanone derivative and its antitumor activity are described.
ASYMMETRIC ADDITION OF ARENESULFONYL CHLORIDES TO STYRENE CATALYZED BY A RUTHENIUM(II) CHIRAL PHOSPHINE COMPLEX
Authors: Kameyama Masayuki , Kamigata Nobumasa , Kobayashi Michio
Published: July 2006

The reactions of arenesulfonyl chlorides with styrene in the presence of a ruthenium(II) chiral phosphine complex, Ru2Cl4,(DIOP)3, proceed under mild conditions to give optically active 1:1 adducts with about 20–40% enantiomeric excess.
NOVEL TETRACYANOQUINODIMETHAN ANION RADICAL SALTS OF HETEROCYCLIC CATIONS CONTAINING A TROPYLIUM ION SKELETON
Authors: Yamashita Yoshiro , Hagiya Koji , Saito Gunzi , Mukai Toshio
Published: July 2006

Heterocyclic cations containing a tropylium ion skeleton form 1:1 simple salts with tetracyanoquinodimethan anion radical, which show good conductivities and novel values of nitrile stretching frequencies. The reduction potentials of cations are related to the reactivities of the salt formation as well as the conductivities of the salts.
SYNTHESIS OF (Z)-4,5,13,14-TETRADEHYDRO-9(O)-METHANO-Δ6(9α)-PGI1
Authors: Iseki Katsuhiko , Shinoda Masaki , Ishiyama Chiyoko , Hayasi Yosio , Yamada Shun-ichi , Shibasaki Masakatsu
Published: July 2006

A stereoselective synthesis of (Z)-4,5,13,14,-tetradehydro-9(O)-methano-Δ6(9α)-PGI1, a potent prostacyclin analog, has been accomplished.
BARRIER TO INTERNAL ROTATION OF 4-BROMOPHENOL BY MICROWAVE SPECTRUM AND AB INITIO CALCULATION
Authors: Motoda Takashi , Onda Masao , Yamaguchi Ichiro
Published: July 2006

Microwave spectra of 4-bromophenol(79Br and 81Br species) were observed. An analysis of the doublets due to internal rotation of the hydroxyl group was made on the basis of the pseudo-symmetric internal rotor model. The doublet splitting of the b-type Q-branch transitions, 139.18 MHz, gave a barrier height V2=14.23 kJ mol . The barrier height V2 for six 4-X-phenols was calculated by means of ab initio MO (4–31G).
RELATIONSHIP BETWEEN THE IONIZATION POTENTIALS AND THE HALF-WAVE POTENTIALS OF SOME TRIS(2,4-DIKETONATO)RUTHENIUM(III) COMPLEXES
Authors: Satsu Yuichi , Endo Akira , Shimizu Kunio , Satô Gen P , Ono Kaori , Watanabe Iwao , Ikeda Shigero
Published: July 2006

The first ionization potentials of five tris(2,4-diketonato)ruthenium(III) complexes determined from their UV photoelectron spectra increase with the increase in the reversible half-wave potentials for the one-electron oxidation of the complexes in acetonitrile. The relationship is explained in terms of the interaction between the non-bonding orbital of acetonitrile molecule and the LUMO of the chelate system of the RuIV species.
PHOTOCATALYTIC DEPOSITION OF LIGHT-LOCALIZED POLYPYRROLE FILM PATTERN ON n-TYPE SILICON WAFERS
Authors: Yoneyama Hiroshi , Kitayama Masahiro
Published: July 2006

Scanning a He–Ne laser beam on n-type Si wafers in acetonitrile containing pyrrole and AgClO4 causes light-localized deposition of electroconductive polypyrrole films under such experimental conditions that the front surface of the wafer over which the laser beam is scanned is well-etched and the back of the wafer is damaged.
CHEMICAL EVIDENCE FOR STABILIZATION OF ELECTRICALLY NEUTRAL DIVALENT CARBON BY POLAR SOLVENTS
Authors: Tomioka Hideo , Hayashi Norihiro , Izawa Yasuji
Published: July 2006

Benzylhalocarbene generated in non-polar solvent is trapped readily by alkene, but the intermolecular process comes to compete poorly with the intramolecular process as the solvent polarity is increased.
USE OF 2-(2-PYRIDYL)ETHYL GROUP AS A NEW PROTECTING GROUP OF INTERNUCLEOTIDIC PHOSPHATES IN OLIGONUCLEOTIDE SYNTHESIS
Authors: Takaku Hiroshi , Hamamoto Shoji , Watanabe Testuo
Published: July 2006

2-(2-Pyridyl)ethyl group is used as a highly selective protecting group of internucleotidic phosphates that is removable under mild conditions by treatment with CH3I in CH3CN without a side reaction such as N-alkylation.
PREPARATION AND PROPERTIES OF TETRACYANOQUINODIMETHANS FUSED WITH PYRAZINE UNITS
Authors: Yamashita Yoshiro , Suzuki Takanori , Saito Gunzi , Mukai Toshio
Published: July 2006

The title compounds were prepared by a TiCl4-catalyzed condensation reaction of corresponding quinones with malononitrile. The data of the cyclic voltammogram show that the anion radicals of dipyrazino-TCNQ derivatives are thermodynamically stable. The anion radical salts were isolated.
OXIDATIVE COUPLING OF KETENE DITHIOACETALS WITH SILYLATED CARBON NUCLEOPHILES BY THE USE OF TRITYL TETRAFLUOROBORATE
Authors: Hashimoto Yukihiko , Mukaiyama Teruaki
Published: July 2006

2-Alkenyl-1,3-dithiolan or dithian-2-ylium cations are yielded by hydride abstraction of cyclic ketene dithioacetals with trityl tetrafluoroborate. These cations react with silyl enol ethers or an allylsilane completely regioselectively to give the corresponding functionalized ketene dithioacetals.
CRYSTAL AND ELECTRONIC STRUCTURES OF (BEDSe-TSeF)2AuBr2
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko
Published: July 2006

The crystal structure of (BEDSe-TSeF)2AuBr2 is very similar to that of the superconducting β-type BEDT-TTF system. Unlike the β-type salt with 2-dimensional(2D) closed Fermi surface, however, (BEDSe-TSeF)2AuBr2 has a 1D plane-like Fermi surface, as a result of strong dimerization and weak transverse interaction.
LIGAND-TO-GUEST CONVERSION OF p-TOLUIDINE MOLECULE IN METAL COMPLEX BIS(p-TOLUIDINE)-1,6-DIAMINOHEXANECADMIUM(II) TETRACYANONICKELATE(II) AND FORMATION OF CLATHRATE COMPOUND-1,6-DIAMINOHEXANECADMIUM(II) TETRACYANONICKELATE(II)-p-TOLUIDINE(1/1)
Authors: Hasegawa Tai , Nishikiori Shin-ichi , Iwamoto Toschitake
Published: July 2006

Bis(p-toluidine)-1,6-diaminohexanecadmium(II) tetracyanonickelate(II) is thermally converted to a clathrate compound 1,6-diaminohexanecadmium(II) tetracyanonickelate(II)-p-toluidine(1/1) in the intermediate stage of the thermal decomposition under ambient atmosphere. The clathrate is prepared in another way by the method similar to those applied to the o- and the m-isomer clathrates but using more dilute guest-diluent mixture.
AN ELECTROCHEMICAL STUDY OF BENZOYLSILANES AND BENZOYLGERMANES
Authors: Mochida Kunio , Okui Shuko , Ichikawa Kyoko , Kanakubo Osamu , Tsuchiya Tohru , Yamamoto Keiji
Published: July 2006

Cyclic voltammetry of seven substituted benzoylsilanes (1) and three benzoylgermanes (2) were investigated. The effects of substituents of 1 and 2 on both cathodic reduction and anodic oxidation potentials were discussed. The cathodic reduction products of 1 were also examined.
POLAR EFFECT ON METALLOPORPHYRIN-CATALYZED REACTION
Authors: Maruyama Kazuhiro , Tamiaki Hitoshi
Published: July 2006

The isomerization rate of 2-carboxyquadricyclanes catalyzed by cobalt–porphyrin complexes was enhanced by introduction of a pyridyl group to the porphyrin ligand. This phenomenon is recognized to be due to a polar effect; an interaction between acid and base.
FACTORS AFFECTING THE OXYGEN ATOM TRANSFER IN METALLOPORPHYRIN-CATALYZED EPOXIDATION OF CYCLOHEXENE, A MODEL FOR P-450 CATALYZED OXIDATION
Authors: Tatsuno Yoshitaka , Sekiya Akihiko , Tani Kazuhide , Saito Taro
Published: July 2006

The effects of metals, substituents on porphyrin and axial ligands on the metalloporphyrin-catalyzed epoxidation of cyclohexene with iodosobenzene were examined. The results suggested that the oxo ligand in the ferryl porphyrin intermediate functions as an electrophile to olefins.
NICKEL-PROMOTED Mo CATALYSTS FOR ALCOHOL SYNTHESIS FROM CO–H2
Authors: Tatsumi Takashi , Muramatsu Atsushi , Fukunaga Tetsuya , Tominaga Hiro-o
Published: July 2006

The Addition of Ni to Mo–KCl/SiO2 enhanced alcohol production from CO–H2 reaction, in improving a selectivity for C2+ alcohols. The production of PrOH increased by adding C2H4 to the CO–H2 mixture, which suggests that CO insersion into a metal-alkyl like bond constitutes the reaction pathway to alcohols.
APPLICATION OF THE NEW ACYLATING AGENTS [PhS(O)–CH=C(OMe)Cl AND PhSO2–CH=C(OMe)Cl] TO THE SYNTHESIS OF INDOLE ALKALOIDS. A TOTAL SYNTHESIS OF (±)-ASPIDOFRACTININE
Authors: Kinoshita Hitoshi , Ohnuma Takeshi , Oishi Takeshi , Ban Yoshio
Published: July 2006

The new acylating agents [PhS(O)–CH=C(OMe)Cl and the corresponding sulfone] were proved to be useful for indroduction of an acetyl group into the α-position of the carbonyl group by means of two-carbon Michael acceptors, which was successfully applied to a total synthesis of (±)-aspidofractinine.
RAMAN SPECTRUM AND THE S–I STRETCHING FREQUENCY OF BENZOYLSULFENYL IODIDE
Authors: Kato Shinzi , Komatsu Yukio , Murai Toshiaki , Hamaguchi Hiro-o , Tasumi Mitsuo , Okazaki Renji
Published: July 2006

The Raman spectrum of benzoylsulfenyl iodide in ether has been observed for the first time using a high-speed multi-channel Raman spectrometer. The S–I stretching frequency is found to be 387 cm−1, which is useful for the characterization of organosulfur compounds involving the S–I linkage.
RAMAN SPECTRA OF LIQUID COMPLEXES OF POLYETHYLENE GLYCOLS WITH ALKALI METAL SALTS
Authors: Kasatani Kazuo , Sato Hiroyasu
Published: July 2006

Raman spectra of liquid complexes of polyethylene glycols (PEG) with alkali metal salts are characterized by an intense polarized band near 860 cm−1. This band can be used as a useful monitor of complex formation. It indicates a nearly symmetric ordering of the PEG chain around the metal cation.
Application of Lanthanoids to Organic Chemistry. Direct Alkoxylation of Anthracene
Authors: Sugiyama Takashi
Published: July 2006

Direct alkoxylation of anthracene with some lower alcohols and ethylene glycol monoalkyl ethers, or monoacetate were carried out in the presence of cerium(IV)tetrakis(trifluoro acetate), and expected alkoxylated anthracene derivatives were obtained.
Colloidal Platinum Catalyst Protected by Nonionic Monomeric and Polymerized Micelle for Photochemical Hydrogen Generation from Water
Authors: Toshima Naoki , Takahashi Tadahito , Hirai Hidefumi
Published: July 2006

Colloidal dispersion of platinum protected by nonionic polymerized micelle was prepared by visible light irradiation followed by γ-ray polymerization of the aqueous solution of H2PtCl6 and polyethylene glycol undecenoate. The colloidal platinum thus obtained showed higher catalytic activity in photochemical hydrogen generation than that protected by the corresponding anionic polymerized micelle.
Photoreduction of CO2 in the [Ru(bpy)2(CO)2]2+/[Ru(bpy)3]2+ or [Ru(phen)3]2+/Triethanolamine/N,N-Dimethylformamide System
Authors: Ishida Hitoshi , Tanaka Koji , Tanaka Toshio
Published: July 2006

The [Ru(bpy)2(CO)2]2+/[Ru(bpy)3]2+ (or [Ru(phen)3]2+)/triethanolamine/N,N-dimethylformamide system reduces CO2 to afford HCOO− efficiently under the irradiation of light (λ>320 nm), where each of the former three components functions as a catalyst, a photosensitizer, and an electron donor, respectively.
Formation of Acetonitrile from Triethylamine on Oxide Catalysts
Authors: Xu Bo-Qing , Yamaguchi Tsutomu , Tanabe Kozo
Published: July 2006

Acetonitrile was found to be formed from triethylamine over ZrO2 by TPD and IR experiments. The activity was higher than that of a strongly acidic SiO2–Al2O3. No acetonitrile was formed over a strongly basic MgO.
Dynamic Fluorescence Microprobe Method Utilizing Total Internal Reflection Phenomenon
Authors: Itaya Akira , Kurahashi Akihiko , Masuhara Hiroshi , Tamai Naoto , Yamazaki Iwao
Published: July 2006

An optical set-up for time-resolved total internal reflection fluorescence spectroscopy under a microscope was developed and its performance was examined by using specially prepared polymer films. This microspectroscopic method provides ps dyamic information for a microvolume of 0.1 μm (depth)×5 μm (diameter).
Preparation, Properties, and Crystal Structure of [1,2,5]Selenadiazolotetracyanonaphthoquinodimethan
Authors: Suzuki Takanori , Kabuto Chizuko , Yamashita Yoshiro , Mukai Toshio
Published: July 2006

The title compound was prepared which forms a two-dimensional “ribbon dimer” network by strong Se–Se and Se–N interactions in the crystal.
A Facile Synthesis of 1,5-Dienes and β,γ-Unsaturated Nitriles via Trityl Perchlorate-Catalyzed Allylation
Authors: Murakami Masahiro , Kato Takashi , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl ethers smoothly react with allylsilanes and silyl cyanide to give the corresponding 1,5-dienes and β,γ-unsaturated nitriles, respectively, in good yields.
Reactions of H2-D2 and H2-O2 over H3PW12O40
Authors: Mizuno Noritaka , Misono Makoto
Published: July 2006

Isotopic equilibration of H2-D2 in the gas and the whole bulk phases of H3PW12O40 proceeded very rapidly, as compared with its reduction and H2O-evolution. It was demonstrated that the formation of H2O in the bulk phase was the rate-determining step for the reduction.
Structure of Three Diacylated Anthocyanins Isolated from Red Cabbage, Brassica oleracea
Authors: Idaka Eiichi , Yamakita Hiroshi , Ogawa Toshihiko , Kondo Tadao , Yamamoto Manabu , Goto Toshio
Published: July 2006

Three diacylated anthocyanins were isolated from Brassica oleracea and their structures determined to be 3-O-(6-O-acy1-2-O-(2-O-sinapyl-β-d-glucopyranosyl)-β-d-glucopyranosyl)-5-O-(β-d-glucopyranosyl)cyanidins, in which the acyl groups were p-coumaryl, ferulyl, and sinapyl, respectively.
2-Ethoxy-2-propenyl Diethyl Phosphate. An Efficient Halo Acetone Equivalent for the Pd-Catalyzed Cross-coupling with Tin Enolates
Authors: Kosugi Masanori , Ohashi Kenji , Akuzawa Kazuko , Kawazoe Takashi , Sano Hiroshi , Migita Toshihiko
Published: July 2006

In the presence of Pd(0) complexes, 2-ethoxy-2-propenyl diethyl phosphate was found to react with organotins to give the corresponding coupling products, showing to be a more efficient halo acetone equivalent compared with the corresponding acetate or carbonate. Reaction with tin enolates gave the 1,4-diketone in moderate to good yields.
Polypyrrole/Polymer Electrolyte Bilayer Composites Prepared by Electrochemical Polymerization of Pyrrole Using Ion-Conducting Polymers as a Solid Electrolyte
Authors: Watanabe Masayoshi , Tadano Keiko , Sanui Kohei , Ogata Naoya
Published: July 2006

The electrochemical polymerization of pyrrole using ion-conducting polymers as a solid electrolyte produces polypyrrole/polymer electrolyte bilayer composites in situ. The bilayer composites show electrochemical activity, corresponding to doping and undoping reactions, in solid state.
High-pressure Kinetic Analysis of [1,9] Sigmatropy of 2-(Benzyloxy)-3-bromotropone to 2-(Benzyloxy)-7-bromotropone
Authors: Sugiyama Shigeru , Mori Akira , Takeshita Hitoshi
Published: July 2006

Thermal rearrangement of 2-(benzyloxy)-3-bromotropone to 2-(benzyloxy)-7-bromotropone, regarded to be the first [1,9] sigmatropic rearrangement, was analyzed by high-pressure kinetics. ΔV≠ for the process were shown to be −11.1 and −10.1 cm3 mol−1 in isopropylbenzene and 1-hexanol, respectively. The figures confirmed the concerted nature of the rearrangement, and were similar to various [1,5] sigmatropies of cyclopentadienes.
Oxidative Addition of Vinyl Acetate to Ruthenium(0) Involving Carbon Oxygen Bond Cleavage Forming a Novel Vinyl(acetato)tris(triethylphosphine)ruthenium(II)
Authors: Komiya Sanshiro , Suzuki Jun-ichi , Miki Kunio , Kasai Nobutami
Published: July 2006

Vinyl acetate oxidatively adds to (1 ,5-cyclooctadiene) (1,3,5-cyclooctatriene)ruthenium(0) in the presence of triethylphosphine to give mer-vinyl (acetato)tris(triethylphosphine)ruthnium(II) at 50 °C in hexane, which has been unequivocally characterized by 1H, 31P, and 13C NMR, IR, elemental analysis, and X-ray structure analysis.
Simultaneous Observation of Spin Polarized Anion and Cation Radicals in Solution by Flash Photolysis ESR
Authors: Kaise Masahiro , Someno Kazuo
Published: July 2006

Time-resolved ESR studies have shown that UV irradiation of a mixture solution of xanthone and 1,4-diazabicyclo[2.2.2]octane generates corresponding radical anions and radical cations at the same time; their unpaired electrons are emissively spin polarized at the initial stage of radical creation as a result of the action of the triplet mechanism of CIDEP.
Host–Guest Complexes of an Amphiphilic β-Cyclodextrin and Azobenzene Derivatives in Langmuir–Blodgett Films
Authors: Tanaka Motoo , Ishizuka Yasuko , Matsumoto Mutsuyoshi , Nakamura Takayoshi , Yabe Akira , Nakanishi Hiroshi , Kawabata Yasujiro , Takahashi Hisao , Tamura Shoji , Tagaki Waichiro , Nakahara Hiroo , Fukuda Kiyoshige
Published: July 2006

Langmuir–Blodgett films of host–guest complexes were fabricated for the first time using heptakis(6-dodecylamino-6-deoxy-)-β-cyclo-dextrin (1) and 4-(4-dimethylaminophenyl)azobenzoic acid. The guest molecule is included in the cavity of 1 with its long axis perpendicular to the film surface.
Aminotellurinylation of Olefins with Benzenetellurinyl Acetate and Ethyl Carbamate
Authors: Hu Nan Xing , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Benzenetellurinyl acetate or trifluoroacetate in combination with ethyl carbamate effected aminotellurinylation of olefins in chloroform under reflux in the presence of boron trifluoride etherate to give ethyl [(2-phenyltelluro)alkyl]carbamates in high yields after reduction with hydrazine hydrate. This reaction was extended to cyclofunctionalization of olefinic carbamates into nitrogen heterocycles.
A Novel Method for the Preparation of Ethers from Carbonyl Compounds with Benzenetellurol Catalyzed by ZnI2
Authors: Nagakawa Keiichi , Osuka Masahiro , Sasaki Kazuaki , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Benzenetellurol is shown to behave as an effective reagent for the reductive conversion of carbonyl compounds into unsymmetrical ethers under the catalytic influence of ZnI2.
Anodic Oxidation of Triphenylphosphine in the Presence of Allylic Silanes. A Facile Electrochemical Preparation of Allyltriphenylphosphonium Tetrafloroborates
Authors: Takanami Toshikatsu , Suda Kohji , Ohmori Hidenobu , Masui Masaichiro
Published: July 2006

Electrochemically generated triphenylphosphine radical cation reacts with allylic silanes to give the corresponding al lyltriphenylphosphonium tetraf loroborates.
Air-Stable Tetrakis(2,4,6-triisopropylphenyl)disilene. Direct Synthesis of Disilene from Dihalomonosilane
Authors: Watanabe Hamao , Takeuchi Ken , Fukawa Norio , Kato Motohiko , Goto Midori , Nagai Yoichiro
Published: July 2006

The most air-stable disilene, tetrakis(2,4,6-triisopropylphenyl) disilene was obtained by the direct treatment of dichloromonosilane, bis(2,4,6-triisopropylphenyl)dichlorosilane, with lithium naphthalenide. The Si=Si bond, the distance being 2.144 Å via X-ray structure analysis, was found to be sterically covered with the four bulky substituents.
Palladium Catalyzed Reaction of Acyltins with Organic Halides
Authors: Kosugi Masanori , Naka Hiroyuki , Harada Saburo , Sano Hiroshi , Migita Toshihiko
Published: July 2006

Palladium catalyzed reaction of acyltins with organic halides were investigated. Among the halides, acyl halides and allylic halides were good substrates, and the latter gave allylic ketones in good yields.
Rate of Heterogeneous Photocatalytic Oxidation of NO2− in Cloud Water Droplets. Estimated for Hypothetical Environmental Conditions
Authors: Hori Yoshio , Suzuki Shin
Published: July 2006

Rates of heterogeneous photooxidation of NO2− were measured in aqueous suspension of TiO2 (anatase), TiO2 (rutile), and ZnO under illumination. The reaction proceeds in zero order with respect to NO2− concentration. The rates were estimated for cloud water droplets in hypothetical environmental conditions. The rate amounts to 11% h−1 for cloud water content of 0.2 g m−3.
Phosphorylation of Glucose with cyclo-Triphosphate
Authors: Tsuhako Mitsutomo , Sueyoshi Chiyoko , Baba Yoshinobu , Miyajima Tohoru , Ohashi Shigeru , Nariai Hiroyuki
Published: July 2006

α-D-glucose reacted with cyclo-triphosphate (P3m) to give tri-, di-, and monophosphate derivatives. The main product, glucose triphosphate was a mixture of glucose 1- and 2-triphosphates (maximum yield = about 47%). Glucose was most effectively phosphorylated in alkaline solutions (pH 10–12) at room temperature.
Electrochemical Formation of Thin Film of Viologen by Disruption of Micelles
Authors: Hoshino Katsuyoshi , Saji Tetsuo
Published: July 2006

A novel electrochemical method for preparing organic thin film is reported. The thin film of a solubilizate, 1,1′-didodecyl-4,4′-bipyridinium dibromide, on glassy-carbon is prepared by electrochemical disruption of micelles formed by the surfactants with ferrocenyl moiety. The film is consisted of a dense skin region and a fiber-like region about 0.47 μm thickness.
Photochemical Switching of Electrochemical Process by Spiropyran LB Films
Authors: Nishiyama Katsuhiko , Fujihira Masamichi
Published: July 2006

Photoelectrochemical control of the ion-blocking ability of the Langmuir–Blodgett (LB) film as an ion gate was demonstrated on a gold optically semi-transparent electrode (Au OTE) coated with multilayers containing photoresponsive amphiphilic compounds. When UV light was irradiated upon the modified Au OTE, this LB film became more compact to block permeation of ions into and out of the LB film and therefore inhibited electrochemical reactions of the redox active species in solution. On the other hand, when visible light was irradiated, this layer became more loose and redox species could penetrate the LB film.
Solid Electrolyte Oxygen Sensor Using LaF3 Sputtered Film Workable at Room Temperature
Authors: Miura Norio , Hisamoto Jun , Kuwata Shigeki , Yamazoe Noboru
Published: July 2006

A solid-state sensor using a sputtered LaF3 film was developed for detecting oxygen at room temperature. The EMF of the sensor varied logarithmically with the oxygen partial pressure. The response of the sensor was much improved by the water vapor treatment at 90 °C for 1 h: the 90% response time at 30 °C was as short as ca. 30 s. A sensing mechanism was proposed.
A Direct Synthesis of γ-, δ-, and ε-Lactones Utilizing SmI2-induced Barbier-type Reaction in the Presence of Hexamethylphosphoric Triamide (HMPA)
Authors: Otsubo Kenji , Kawamura Kisa , Inanaga Junji , Yamaguchi Masaru
Published: July 2006

By using an efficient reduction system of SmI2-THF-HMPA, the coupling reaction of β-, γ, or δ-bromoesters with carbonyl compounds was completed within a minute at room temperature affording γ-, δ-, or ε-lactones, respectively, in good yields. Cp2ZrCl2 was also found to be effective for the coupling with ketones.
A Highly Efficient Synthesis of Prostaglandin ω-Chain Precursors
Authors: Kitano Yasunori , Matsumoto Takashi , Okamoto Sentaro , Shimazaki Toshiyuki , Kobayashi Yuichi , Sato Fumie
Published: July 2006

Kinetic resolution of γ-tributylstannyl allylic alcohols by the Sharpless asymmetric epoxidation proceeds with synthetically satisfactory rate differences for the two enantiomers, thus providing a highly efficient method for the synthesis of prostaglandin ω-chain.
Catalytic Properties of Silica-Alumina Prepared by Chemical Vapor Deposition
Authors: Sato Satoshi , Toita Masato , Yu Yu-Qing , Sodesawa Toshiaki , Nozaki Fumio
Published: July 2006

Strong Broensted acid sites were generated on Al2O3 support by the chemical vapor deposition (CVD) of SiO2 using Si(OEt)4 under atmospheric pressure. The CVD silica-alumina had a maximum acid strength of Ho = −8.2 and exhibited high catalytic activities for both the dehydration of 2-butanol and the cracking of cumene.
Adsorption of Diethyl Phosphate on Alumina and Magnesia Surface Studied by Inelastic Electron Tunneling Spectroscopy
Authors: Higo Morihide , Owaki Yasuhiro , Kamata Satsuo
Published: July 2006

Inelastic electron tunneling spectroscopy has been used for obtaining the vibrational spectra of diethyl phosphate adsorbed onto the alumina and magnesia surfaces. The analysis of the spectra and comparison of the infrared and Raman spectra show that the diethyl phosphate is adsorbed as the anion onto both the oxide surfaces.
“Selenium Polonovski Reaction” Using Benzeneselenenyl Triflate
Authors: Okazaki Renji , Itoh Yukinori
Published: July 2006

Selenoxyammonium salts prepared from tertiary amine N-oxides and benzeneselenenyl triflate undergo rearrangement in the presence of triethylamine or DBU to give α-selenoxyamines, which react in situ with an electrophile or nucleophile to afford new secondary or tertiary amine derivatives.
Solubilization of Chlorophyll a-Dioxane Complex in Water by Polyvinyl Alcohol
Authors: Inamura Isamu
Published: July 2006

The chlorophyll a (Chi a)-dioxane complex was solubilized in water by binding to polyvinyl alcohol (PVA), which resulted in Chi a-dioxane-PVA colloid. The absorption and fluorescence spectra of the aqueous solution of the Chi a-dioxane-PVA colloid were obtained. They were compared with the spectra of the Chi a in an aqueous dioxane (35%) solution and the Chi a-PVA complex in water.
The Significance of the Diphosphate Linkage Involved in the Substrates for Prenyltransferase. Geranyl- and Dimethylallyl Methylenediphosphonate as Artificial Substrates
Authors: Gotoh Takeshi , Koyama Tanetoshi , Ogura Kyozo
Published: July 2006

Dimethylallyl- and geranyl methylenediphosphonate are active as artificial substrates for farnesyl diphosphate synthase to give E,E-farnesyl diphosphate. By comparing the kinetic data obtained with the analogues and the natural substrates, the significance of the diphosphate moiety of the substrates of prenyltransferase is discussed.
Ab initio SCF MO Study of the Gas-Phase Reaction C6H6 + CH3 → C6H5(CH3)H → C6H5CH3 + H
Authors: Fueno Takayuki , Yokota Shizuo
Published: July 2006

The minimum-energy paths for a sequence of reactions C6H6 + CH3 → C6H5(CH3)H → C6H5CH3 + H have been traced by the UHF SCF procedure employing the 4-31G basis functions, to locate the transition states. The activation barrier heights obtained are well in accord with the available gas-kinetic data.
Application of 13C-CP-MAS NMR and 57Fe-Moessbauer Spectroscopic Studies of the Reaction Products of Ruthenocene Derivatives with Lewis Acids
Authors: Watanabe Masanobu , Masuda Yuichi , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

Adducts of ruthenocene derivatives with Lewis acids (HgCl2, SnCl4, and I2) were studied by means of 13C-CP-MAS NMR spectroscopy and other physicochemical techniques. Large low-field shifts found in the 13C-CP-MAS NMR spectroscopy suggest the presence of a direct chemical bonding between the ruthenium and the Lewis acids.
New Dinucleating Macrocycle, 12,24-Dihydroxy-1,6-dioxo-2,5,14,17-tetraaza[6·6]metacyclophane-13,17-diene and Its Metal Complexes
Authors: Tanaka Mitsunori , Fujii Yoshihiro , Okawa Hisashi , Shinmyozu Teruo , Inazu Takahiko
Published: July 2006

A dinucleating macrocycle with dissimilar coordination sites (imine and amide sites), 12,24-dihydroxy-1,6-dioxo-2,5,14,17-tetra-aza[6·6]metacyclophane-13,17-diene, has been obtained and its complexing behavior was examined. It forms both mononuclear and dinuclear complexes with nickel(II) ion but only dinuclear complex with copper(II) ion. In the mononuclear nickel(II) complex the metal ion is bound at the imine site. In the dinuclear copper(II) complex an antiferromagnetic spin-exchange interaction (J=−355.2 cm−1) occurred through the bridging phenolic oxygens.
pH-Dependent Fusion of Lipid Vesicles Induced by Proton-Sensitive Polymer
Authors: Oku Naoto , Aoyama Kaoruko , Shibamoto Sayumi , Ito Fumiaki , Gondo Hisanori , Nango Mamoru
Published: July 2006

A novel pH-sensitive polymer, acety1-imidazole-polyethylenimine, was synthesized. The polymer caused aggregation and membrane intermixing of sonicated phospholipid vesicles containing phosphatidylserine following lowering of the pH of the solution. This polymer seems useful for many liposomal applications.
New Routes to Regioselectively Mono-Protected 1,3-Diols from Allyl and Homoallyl Alcohols via Intramolecular Hydrosilation
Authors: Tamao Kohei , Yamauchi Takayoshi , Ito Yoshihiko
Published: July 2006

Allyl and homoallyl alcohols are transformed into 1,3-diol derivatives, in which only the originally present hydroxy groups are regioselectively protected, by a sequence of intramolecular hydrosilation, protection, and oxidative cleavage of the carbon–silicon bond. Stereochemical aspects are also described.
Synthesis and Crystal Structure of [(CH3)4N]4Na2[As2Mo12O42]·6H2O
Authors: Ozawa Yoshiki , Sasaki Yukiyoshi
Published: July 2006

A novel dodecamolybdodiarsenate(III) salt [(CH3)4N]4Na2[As2Mo12O42]·6H2O is synthesized and its crystal structure is determined. The trivalent As heteroatoms with an unshared electron pair are bonded to three O atoms with the distances of 1.79 Å to form AsO3 trigonal pyramids. The polyanion molecule has no symmetry elements, consisting of twelve distorted MoO6 octahedra.
Stereospecificity of the Hydride Transfer Reaction Catalyzed by Isopropylmalate Dehydrogenase of Thermophilic Bacteria Thermus thermophilus
Authors: Yamada Tohru , Kakinuma Katsumi , Endo Toyoshige , Oshima Tairo
Published: July 2006

Nuclear megnetic resonance studies on the NAD-dependent reaction catalysed by isopropylmalate dehydrogenase from T. chermophilus HB8 revealed that pro  R specific (A specific) hydride transfer from the substrate to the nicotinamide ring is involved during the said oxido-reduction.
Fiber Drawing from Silicon Alkoxide Solutions in the Sol–Gel Process
Authors: Sakka Sumio , Kozuka Hiromitsu
Published: July 2006

The occurrence of the spinnability in the sols prepared by the hydrolysis and polycondensation of tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane and tetranormalbutoxysilane has been investigated. It has been found that the spinnability appears at high viscosities in all of these solutions when the H2O/Si(OR)4 mole ratio of the starting solution is 2 and an acid is used in the hydrolysis reaction. It has also been shown that the spinnable solutions show the Newtonian behavior at high viscosities.
Novel Structures of 1:1 Complexes of 1,4,7,10,13-Pentaoxa- and 1,13-Dioxa-4,7,10-trithia[13](1,1′)ruthenocenophanes with HgCl2
Authors: Akabori Sadatoshi , Sato Sadao , Kawazoe Kayoko , Tamura Chihiro , Sato Masaru , Habata Yoichi
Published: July 2006

The structures of 1:1 complexes of 1,4,7,10,13-pentaoxa- and 1,13-dioxa-4,7,10-trithia[13](1,1′)ruthenocenophanes with HgCl2 have been determined by the single crystal X-ray diffraction method. The complexing forms of the two complexes are quite similar to each other. Only the Ru atom of the ruthenocene nucleus was coordinated to HgCl2 with a slightly distorted trigonal–planar configuration. The distances between the Ru and the Hg atoms are 2.683(3) and 2.704(1) Å, respectively.
Formation of Highly Porous Opaque Gel from Alkoxysilane Solutions
Authors: Kozuka Hiromitsu , Sakka Sumio
Published: July 2006

Effects of kind of alkoxysilane, alcohol and acid on gelation of alkoxysilane solutions of high acid concentration and low water concentration have been studied in terms of the appearance of gel, the microstructure of gel and the gelling time to investigate the possibility of producing gels with high porosity and large pores, which are essential for obtaining large silica body without cracks and bloating. It has been found that tetramethoxysilane, methanol and hydrochloric acid have an effect of shortening the gelling time and make it possible to produce highly porous opaque gels.
Water Biophotolysis System Using Cyanobacterial Electrode
Authors: Ochiai Hideo , Shibata Hitoshi , Sawa Yoshihiro , Inamura Isamu , Morikawa Wataru , Minami Masayoshi
Published: July 2006

By using living cyanobacterial electrode as a working electrode, hydrogen production was performed through water-biophotolysis with two-stage, three-electrode apparatus. Electrically reduced methyl viologen in the cathode vessel worked as a substrate of hydrogenase to evolve hydrogen gas in the presence of both phenazine methosulfate and NADH under concomitant supply of electric current.
Conformations and Reactivities of Dimethyl 2,4-Dibromobicyclo[3.2.1]octane-6,7-dicarboxylates and Their 8-Oxa Analogs. A New Access to Tetracyclo[3.2.1.02,7.04,5]octane System
Authors: Kato Masahiko , Yamamoto Shigeyuki , Yoshihara Tohoru , Furuichi Kimiaki , Miwa Toshio
Published: July 2006

In solution, 6,7-disubstituted 2,4-dibromobicyclo[3.2.1]octanes and their 8-oxa analogs were deduced to exist preferentially in chair conformations of their 6-membered ring by comparing their JVic with those calculated for the conformations obtained by MM2 method. Among them, the 2-exo,4-exo-dibromides on treatment with base gave readily tetracyclo[3.2.1.02,7.04,5]octane derivative and its 3-oxa analog by double 1,3-dehydrobromination.
Structure Dependence in Hydrogenation of 1,3-Butadiene over Ru Thin Film Prepared by RF Sputtering Method
Authors: Tamaki Jun , Miyanaga Toshiaki , Imanaka Toshinobu , Yamane Toshimi
Published: July 2006

The structure of the Ru film prepared by the RF sputtering method changed with film growth. This influenced the activity and the selectivity in the hydrogenation of 1,3-butadiene. It has been found that the partial hydrogenation of 1,3-butadiene proceeds preferably over (002) face of Ru.
Useful Chiral Stationary Phases for HPLC. Amylose Tris(3,5-dimethylphenylcarbamate) and Tris(3,5-dichlorophenylcarbamate) Supported on Silica Gel
Authors: Okamoto Yoshio , Aburatani Ryo , Fukumoto Tohru , Hatada Koichi
Published: July 2006

Amylose tris(3,5-dimethylphenylcarbamate) (ADMPC) and tris(3,5-dichlorophenylcarbamate) (ADCPC) were supported on macroporous silica gel to use as chiral stationary phases for HPLC. ADMPC showed higher optical resolving power for some enantiomeric pairs than cellulose tris(3,5-dimethylphenylcarbamate), and gave a practically useful chiral HPLC column. ADCPC resolved a few racemic drugs efficiently.
Synthesis of 12-Hydroxy-10-methylenetricyclo[7.2.1.01,6]dodecan-11-one
Authors: Ue Masaki , Kobiro Kazuya , Kakiuchi Kiyomi , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

A new type of tricyclic compound, having bicyclo[3.2.1]octane skeleton with an α-methylenecyclopentanone moiety and trans-bicyclo[4.4.0]decane structure, has been synthesized by skeletal transformation of exo-3-methylenetricyclo[6.4.0.01,4]dodecan-5-ol.
Dramatic Hydrogen Pressure and Triethylamine Effects on the Asymmetric Hydrogenation of Itaconic Acid Which Give a New Mechanistic Aspect on Asymmetric Induction
Authors: Takahashi Hisashi , Achiwa Kazuo
Published: July 2006

Dramatic hydrogen pressure and triethylamine effects on the asymmetric hydrogenation of itaconic acid catalyzed by BCPM-Rh+ and an explanation for these effects were described.
A Novel Method for the In situ Generation of Alkoxydialkylboranes and Their Use in the Selective Preparation of 1,3-syn Diols
Authors: Chen Kau-Ming , Gunderson Karl G , Hardtmann Goetz E , Prasad Kapa , Repic Oljan , Shapiro Michael J
Published: July 2006

An in situ method for generating Et2BOCH3 from triethylborane and methanol without using any other catalysts is described. Using the Et2BOCH3 thus generated as a chelating agent, syn 1,3-diols are prepared in ≥ 98% stereochemical purity by reducing β-hydroxyketones with sodium borohydride.
Coupling Reaction of Allyl Sulfones Using Sodium Hydroxide in Liquid Ammonia
Authors: Takikawa Yuji , Osanai Kimiko , Sasaki Satoshi , Shimada Kazuaki
Published: July 2006

Vinylcyclopropane derivatives containing two isomers were respectively obtained in good yields in the reactions of 3-methyl-2-butenyl, geranyl, and neryl p-tolyl sulfones with NaOH in liquid ammonia. On the other hand, the reaction with crotyl p-tolyl sulfone gave 2-ethyl-1,3-di-p-toluenesulfonylpropane in good yield.
Carbon Dioxide Fixation Coupled with Nitrite Reduction, Catalyzed by 4Fe4S Cluster
Authors: Tanaka Koji , Wakita Ryuhei , Tanaka Toshio
Published: July 2006

The reduction of (Et4N)NO2 catalyzed by (Bu4N)2[Fe4S4(SPh)4] in the presence of PhCOCH3 and Molecular Sieves 3A as a proton source and a dehydration agent, respectively, under the controlled potential electrolysis at −1.25 V vs. SCE in CO2-saturated CH3CN catalytically produced not only N2 with a small amount of N2O as a precursor of N2 but also PhCOCH2COO−.
Desulfurizative Stannylation of Allyl Sulfide Using Tributylstannyllithium
Authors: Takeda Takeshi , Ogawa Shinji , Ohta Nagaaki , Fujiwara Tooru
Published: July 2006

Allylstannanes were prepared by the reaction of allyl sulfides with tributylstannyllithium in the presence of CuBr and HMPA in good yields.
Surface Reaction of Dimethyl Phosphite on Alumina and Magnesia Studied by Inelastic Electron Tunneling Spectroscopy
Authors: Higo Morihide , Owaki Yasuhiro , Kamata Satsuo
Published: July 2006

Vibrational spectra of dimethyl phosphite on Al2O3 and MgO surfaces have been measured by inelastic electron tunneling spectroscopy. The analysis of the spectra and comparison of the spectrum of phosphorous acid indicate that dimethyl phosphite decomposes on the surfaces and is adsorbed preferentially as the phosphite anion.
Anti Stereochemistry in SE″ Reaction of an Optically Active 2,4-Dienylsilane
Authors: Hayashi Tamio , Matsumoto Yonetatsu , Ito Yoshihiko
Published: July 2006

The SE″ reaction of (S)-(3E,5E)-2-(trimethylsilyl)hepta-3,5-diene with acetyl chloride and aluminum chloride in dichloromethane proceeded with anti stereochemistry to give (2Z,4E)-6-methylocta-2,4-dien-7-one of R configuration and its (2E,4E) isomer of S configuration.
Ytterbium Metal Mediated Synthesis of Symmetrical and Unsymmetrical Pinacols from Carbonyl Compounds
Authors: Hou Zhaomin , Takamine Kan , Fujiwara Yuzo , Taniguchi Hiroshi
Published: July 2006

Reaction of aromatic aldehydes and ketones with ytterbium metal gives the corresponding pinacols in high yields. Cross-coupling reaction of benzophenone with other carbonyl compounds to produce unsymmetrical pinacols is also described.
Synthesis of Some 1,6-Anhydro Disaccharides via Aryl Glycosyl Sulfones
Authors: Funabashi Masuo , Nagashima Hidetoshi
Published: July 2006

1,6-Anhydro-lactose, -maltose, and -cellobisoe were practically prepared in mild reaction conditions and in fairly good yield via alkaline degradation of various aryl glycosyl sulfones derived from the corresponding disaccharides.
Electron Transfer Reaction from Dimethylanilines to Cation Radical of Magnesium Octaethylporphyrin
Authors: Kojo Shosuke , Morimitsu Kozo , Tabushi Iwao
Published: July 2006

A kinetic study of electron transfer reaction from dimethylanilines to cation radical of magnesium octaethylporphyrin reveals that two mechanisms are operating depending on the redox potentials of dimethylanilines.
SmI2-Induced Deoxygenation of Epoxides and Its Application to Carbonyl Methylenation in Combination with Iodomethylation
Authors: Matsukawa Mihaya , Tabuchi Takanori , Inanaga Junji , Yamaguchi Masaru
Published: July 2006

Deoxygenation of epoxides to olefins was effected by an efficient electron transfer system of SmI2-THF-HMPA in the presence of N,N-dimethylaminoethanol (DMAE) or glutaric anhydride. This procedure, in combination with the SmI2-induced iodomethylation, afforded a new, rapid and mild one-pot carbonyl methylenation method.
Effect of Wettability of Injection Nozzle on the Size of Oil Droplets in Water
Authors: Ogino Keizo , Ohki Hiroshi , Abe Masahiko
Published: July 2006

The hydrophilic cotton filter was found to be more effective as an injection nozzle than any other hydrophobic polymer filters tested to make smaller oil droplets of n-dodecane dispersed in continuum water phase. The droplet size is reduced with an increase in the hydrophilic property (especialy, the hydrogen bonding force) of the polymer surfaces.
Pronounced Catalytic Activity of La1−x Srx CoO3 Highly Dispersed on ZrO2 for Complete Oxidation of Propane
Authors: Fujii Hiroaki , Mizuno Noritaka , Misono Makoto
Published: July 2006

LaCoO3 and La0.8 Sr0.2 CoO3 highly dispersed on ZrO2 was prepared by impregnation method. The high dispersion was confirmed by IR spectra of pyridine adsorbed on ZrO2 as well as by TEM and XRD. The catalysts showed very high catalytic activities for the complete oxidation of propane.
Oxidative Coupling of Methane with Alkaline Earth Halide Catalysts Supported on Alkaline Earth Oxides
Authors: Fujimoto Kaoru , Hashimoto Shigeru , Asami Kenji , Tominaga Hiro-o
Published: July 2006

Halides of alkaline earth metal oxides such as MgCl2 or CaCl2 on CaO or on MgO were found to be excellent catalysts for the oxidative coupling of methane. The selectivity of C2 hydrocarbon reached 87% at 750 °C and CH4/O2=9.
A New Synthetic Approach to the Carbapenem Antibiotic PS-5 from Ethyl (S)-3-Hydroxybutanoate
Authors: Chiba Toshiyuki , Nakai Takeshi
Published: July 2006

A new synthetic route to the PS-5 key precursor is described which involves the fully stereocontrolled transformation of the optically active 2-azetidinone derivative easily obtainable from ethyl (S)-3-hydroxybutanoate.
Crystal Structure of a Binuclear N,N′-Disalicylidene-(R,R)-1,2-cyclohexanediamine-Titanium(IV) Complex and Asymmetric Oxidation of Methyl Phenyl Sulfide with Trityl Hydroperoxide Catalyzed by the Complex
Authors: Nakajima Kiyohiko , Sasaki Caori , Kojima Masaaki , Aoyama Tomonori , Ohba Shigeru , Saito Yoshihiko , Fujita Junnosuke
Published: July 2006

A binuclear titanium(IV) complex with N,N′-disalicylidene-(R,R)-1,2-cyclohexanediamine was prepared and the structure was determined by X-ray analysis. The complex catalyzes asymmetric oxidation of methyl phenyl sulfide with trityl hydroperoxide in methanol at 0 °C to give (R)-methyl phenyl sulfoxide with an optical yield of 53%.
Catalytic Formation of Biaryls from Arenes through C–H Bond Activation by RhCl(CO)(PMe3)2 under Irradiation
Authors: Sakakura Toshiyasu , Sodeyama Touru , Tokunaga Yuko , Tanaka Masato
Published: July 2006

Arenes were dehydrogenatively coupled into biaryls catalyzed by RhCl(CO)(PMe3)2 at room temperature under irradiation. The regioselectivity obtained in the reaction of toluene suggested the presence of a radical intermediate.
Stereoselective C-Glycosidation of Glycals with Organoaluminum Reagents
Authors: Maruoka Keiji , Nonoshita Katsumasa , Itoh Takayuki , Yamamoto Hisashi
Published: July 2006

A new approach to the stereoselective synthesis of C-glycosides from glycals with various organoaluminum reagents has been demonstrated.
Asymmetric Synthesis of (1S,3S,5R)-1,3-Dimethyl-2,9-dioxabicyclo[3.3.1]nonane Mediated by Fermenting Bakers’ Yeast
Authors: Ohta Hiromichi , Ozaki Kazuhiko , Tsuchihashi Gen-ichi
Published: July 2006

Optically active (1S,3S,5R)-1,3-dimethyl-2,9-dioxabicyclo-[3.3.1]nonane has been synthesized in short steps including regio-and enantioselective reduction of 1,3-diketones by actively fermenting bakers’ yeast.
Photoinduced Direct Synthesis of Silylene-Bridged Dinuclear Iron Complexes [(η5-C5H5)2Fe2(CO)2(μ-CO)(μ-SiHR)] from [(η5-C5H5)Fe(CO)2SiMe3] and RSiH3 (R = t-Bu, (CMe2)2H)
Authors: Tobita Hiromi , Kawano Yasuro , Shimoi Mamoru , Ogino Hiroshi
Published: July 2006

Photolysis of [CpFe(CO)2SiMe3] (Cp = η5-C5H5) in the presence of RSiH3 (R = t-Bu, (CMe2)2H) afforded silylene-bridged dinuclear complexes [Cp2Fe2(CO)2(μ-CO)(μ-SiHR)] , The structure of the complex [Cp2Fe2(CO)2(μ-CO)(μ-SiHBut)] was determined by X-ray crystallography.
Diels–Alder Reaction of Dimethyl Acetoxymethylenemalonate with 3,4-Dialkoxyfurans and the Utility of Its Adducts in the Stereospecific Synthesis of Lyxopyranosyl C-Glycosides
Authors: Katagiri Nobuya , Akatsuka Hidenori , Haneda Toru , Kaneko Chikara
Published: July 2006

Dimethyl lyxopyranosylmalonates were synthesized in stereospecific manner from the adducts obtained from Diels–Alder reaction of 3,4-dialkoxyfurans and dimethyl acetoxymethylenemalonate, through retrograde aldol C–C bond fission under reductive condition as a key step.
Induced Circular Dichroism in Calixarene Complexes
Authors: Arimura Takashi , Edamitsu Sayuri , Shinkai Seiji , Manabe Osamu , Muramatsu Tsuyoshi , Tashiro Masashi
Published: July 2006

The induced circular dichroism (ICD) spectra were applied to the estimation of host–guest-type interactions of water-soluble calixarenes. It was found that certain azo-dye stuffs give the ICD spectra in the presence of a chiral calixarene, 5,11,17,23,29,35-hexasulfonato-37,38,39,40,41,42-hexakis((S)-2-methylbutyloxy)calix[6]arene and p-nitrocalix[6]arene and p-nitrocalix[8]arene give the ICD spectra upon complexation of a chiral guest, (R)-1,1′-binaphthyl-2,2′-phosphoric acid but p-nitrocalix[4]arene is absolutely silent.
Palladium-Catalyzed Reaction of Propargylic Acetates with Carbonyl Compounds by SmI2
Authors: Tabuchi Takanori , Inanaga Junji , Yamaguchi Masaru
Published: July 2006

Reductive addition of propargylic acetates to carbonyl compounds proceeded smoothly at room temperature by using SmI2 and a catalytic amount of Pd(PPh3)4 to give the corresponding acetylenic and/or allenic alcohols with appreciable selectivity. The method is useful especially for the preparation of tri- and tetrasubstituted allenic alcohols.
Preparation and Crystal Structures of Tetracyanoquinodimethans Fused with [1,2,5]Selenadiazole Units
Authors: Suzuki Takanori , Kabuto Chizuko , Yamashita Yoshiro , Saito Gunzi , Mukai Toshio , Miyashi Tsutomu
Published: July 2006

The title electron acceptors, TSDA (2) and BSDA (3), were prepared which crystallize isomorphously with the sulfur analogue, BTDA (1). The molecular interactions are enhanced in 2 and 3 compared with 1, which connect the molecules to form two-dimensionally expanded “sheet-like” networks and their infinite layers.
2,4,6-Tris(bis(trimethylsilyl)methyl)phenyl, a New Sterically Demanding Group for Kinetic Stabilization of Unstable Compounds
Authors: Okazaki Renji , Unno Masafumi , Inamoto Naoki
Published: July 2006

The titled group (Ar) has been found to be very efficient for kinetic stabilization of a highly reactive N-thiosulfinyl group. The synthesis and the thermal and photochemical behavior of Ar–N=S=S are described.