bluuebunny/crossref_metadata_2025 huggingface dataset:
ACCELERATION OF SOLID–LIQUID TWO-PHASE REACTION BY MEANS OF ALUMINA-WATER-ULTRASOUND. A SUBSTITUTE FOR A PHASE TRANSFER CATALYST
Authors: Ando Takashi , Kawate Takehiko , Yamawaki) Junko Ichihara (nee , Hanafusa Terukiyo
Published: July 2006

Combined use of alumina, a trace of water, and ultrasound greatly accelerated a solid–liquid two-phase nucleophilic substitution by cyanide ion in nonpolar organic solvents. The efficiency under the optimum conditions were compared with that of phase transfer catalysts such as 18-crown-6.
HIGHLY STEREOSELECTIVE PROCEDURE FOR (6R)-TETRAHYDROBIOPTERIN COFACTOR
Authors: Matsuura Sadao , Murata Shizuaki , Sugimoto Takashi
Published: July 2006

(6R)-Tetrahydrobiopterin cofactor for aromatic amino acid hydroxylases was synthesized stereoselectively by catalytic hydrogenation of biopterin over platinum oxide at pH 11.4 and subsequent crystallization from hydrochloric acid and ethanol.
ASYMMETRIC REDUCTION OF ACETOPHENONE WITH CHIRAL REAGENTS FROM LITHIUM TETRAHYDROALUMINATE AND CHIRAL 1,2-DIOL OR DIAMINE AS STUDIED BY ALUMINUM-27 NUCLEAR MAGNETIC RESONANCE
Authors: Yamashita Junzo , Tomiyama Shigemi , Hashimoto Harukichi , Kitahara Keiichi , Sato Hisao
Published: July 2006

Asymmetric reduction of acetophenone with chiral reagents from lithium tetrahydroaluminate and (1S,2S)-1,2-diphenylethanediol or (1S,2S)-N,N′-diethyl-1,2-diphenylethanediamine in the presence or absence of added ethanol is studied by aluminum-27 NMR spectroscopy.
CIRCULAR DICHROISM INDUCED ON ARYLMETHYL CARBANIONS
Authors: Okamoto Yoshio , Takeda Takahiro , Hatada Koichi
Published: July 2006

Circular dichroism spectra of fluorenyllithium, benzyllithium, diphenylmethyllithium, triphenylmethyllithium, and 1,1-diphenylhexyllithium were measured in the presence of chiral tertiary diamines, (−)-sparteine, (+)- and (−)-2,3-dimethoxy-1,4-bis(dimethylamino)butane. All the carbanions showed induced circular dichroism (ICD) in nonpolar mediums.
REACTIONS OF NITRONES BEARING AN OLEFINIC DIPOLAROPHILE WITH DIMETHYL ACETYLENEDICARBOXYLATE. INTER- AND INTRAMOLECULAR DOUBLE 1,3-DIPOLAR CYCLOADDITIONS
Authors: Tsuge Otohiko , Ueno Kazunori , Kanemasa Shuji
Published: July 2006

The reaction of nitrones, derived from benzaldehydes having an olefinic dipolarophile at the o-position, with DMAD provides the first example for the inter- and intramolecular double 1,3-dipolar cycloaddition.
DEALUMINATION OF ZSM-5 ZEOLITE. SELECTIVE REMOVAL OF ALUMINUM ON EXTERNAL SURFACE OF ZEOLITE CRYSTALLITES
Authors: Namba Seitaro , Inaka Akira , Yashima Tatsuaki
Published: July 2006

Upon the SiCl4 treatment at 723–923 K the dealumination of NaZSM-5 zeolite took place without destruction of zeolite structure. At the higher temperature the more selective removal of framework aluminum on the external surface of zeolite crystallites was performed.
INTRAMOLECULAR ALLYLATION OF CARBONYL COMPOUNDS. A NEW METHOD FOR FIVE AND SIX MEMBERED RING FORMATION
Authors: Nokami Junzo , Wakabayashi Shoji , Okawara Rokuro
Published: July 2006

By using metallic tin and aluminum in an aqueous medium, ketone having allylic-halides functionality can be cyclized to form five and six membered rings.
A FACILE SYNTHESIS OF α-GLUCOSIDES AND α-RIBOSIDES FROM THE CORRESPONDING 1-O-ACYL SUGARS AND ALCOHOLS IN THE PRESENCE OF TRITYL PERCHLORATE
Authors: Mukaiyama Teruaki , Kobayashi Shu , Shoda Shin-ichiro
Published: July 2006

In the presence of trityl perchlorate, 1-O-bromoacetyl-β-d-glucose stereoselectively reacts with alcohols to give the corresponding α-glucosides in good yields. The similar reaction of 1-O-acetyl-β-d-ribose affords the corresponding β-ribosides exclusively, while in the presence of molecular sieves 4A and lithium perchlorate, α-ribosides are prepared predominantly in good yields.
A POTENTIOMETRIC OXYGEN SENSOR USING LaF3 SINGLE CRYSTAL OPERATIVE AT ROOM TEMPERATURE
Authors: Kuwata Shigeki , Miura Norio , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

The electromotive force (EMF) of a solid-electrolyte cell using LaF3 single crystal was found to respond to a change of oxygen partial pressure even at 25 °C, in accordance with the Nernst’s law. The 90% response time of this sensor was as short as ca. 3 min at 25 °C.
NOVEL ASYMMETRIC ALKYLATION OF CYCLIC β-KETO ESTERS WITH OPTICALLY ACTIVE SULFONIUM SALTS
Authors: Kobayashi Michio , Umemura Kazuyuki , Watanabe Nobuko , Matsuyama Haruo
Published: July 2006

A new asymmetric alkylation of cyclic β-keto esters with optically active sulfonium salts, which are easily prepared by optical resolution methods, has been investigated. Relative reactivities for alkyl substituents are found to be quite different from those for SN2 alkylation. Stereochemical reaction course via S–O sulfurane intermediate for this new reaction is proposed.
EFFICIENT PREPARATION OF POLYSUBSTITUTED 1,3-DIENES FROM α,α′-DIKETO SULFIDES
Authors: Nakayama Juzo , Machida Haruki , Saito Ryuji , Akimoto Keiichi , Hoshino Masamatsu
Published: July 2006

A series of polysubstituted 1,3-dienes were prepared in good overall yields in three steps starting from readily accessible α,α′-diketo sulfides.
NEGATIVE MAGNETORESISTANCE AND ANDERSON LOCALIZATION IN BLACK PHOSPHORUS SINGLE CRYSTALS
Authors: Iwasaki Noriko , Maruyama Yusei , Kurihara Susumu , Shirotani Ichimin , Kinoshita Minoru
Published: July 2006

The electrical resistance of black phosphorus single crystals at low temperatures was analyzed as functions of temperature and magnetic field. Logarithmic dependence of the conductivity on both variables was found. This fact, together with the negative magnetoresistance observed at 4.2 K, suggests the existence of the two dimensional Anderson localization of valence-band holes in black phosphorus single crystals at low temperatures.
STRUCTURE OF NEW BROMODITERPENES, PINNATOLS, FROM THE MARINE RED ALGA LAURENCIA PINNATA YAMADA
Authors: Fukuzawa Akio , Miyamoto Mitsuaki , Kumagai Yoshikazu , Abiko Atsushi , Takaya Yoshiaki , Masamune Tadashi
Published: July 2006

The structure of new bromoditerpenes named pinnatols A, B, C,and D, isolated from the title alga, was determined on the basis of the chemical and spectral data.
SYNTHESES OF NEW [2.2]PYRIDINOPHANES
Authors: Kawashima Toshihide , Kurioka Shiroh , Tohda Yasuo , Ariga Masahiro , Mori Yutaka , Misumi Soichi
Published: July 2006

Six meta-bridged [2.2]pyridinophanes including three new compounds are synthesized successfully via the corresponding cyclic disulfides. Electronic effect of nitrogen atoms in pyridine rings constructed in a [2.2]metacyclophane-like stepped form is studied on the basis of their 1H and 13C NMR spectra.
OXYGEN-SORPTIVE PROPERTIES OF DEFECT PEROVSKITE-TYPE La1−xSrxCo1−yFeyO3−δ
Authors: Teraoka Yasutake , Zhang Hua-Min , Yamazoe Noboru
Published: July 2006

The substitution of Fe for Co of La1−xSrxCoO3−δ makes it possible to preserve perovskite-type structure at higher Sr contents. While the amount of oxygen reversibly absorbed or desorbed was mostly determined by the Sr content, the Fe substitution was found to enhance the oxygen desorption particularly in a lower temperature region as well as catalytic activities.
PHOTOCHEMICAL ACTIVATION OF ALUMINUM–ALKYL BOND IN ALUMINUM PORPHYRIN. CONJUGATE ADDITION REACTION WITH VINYL KETONE
Authors: Murayama Hideki , Inoue Shohei
Published: July 2006

Tetraphenylporphinatoaluminum ethyl undergoes addition reaction toward vinyl ketone via a novel enolate aluminum porphyrin as the intermediate. This reaction is remarkably accelerated upon irradiation with visible light retaining the reaction mode.
ON THE REACTION OF N-VINYLIMINOPHOSPHORANES. SYNTHESIS AND REACTION OF 1,2-λ5-AZAPHOSPHORINE RING SYSTEM
Authors: Kobayashi Tomoshige , Nitta Makoto
Published: July 2006

The reaction of N-vinyliminotrimethoxyphosphorane reacts with electron deficient acetylenes results in the formation of formal [4+2] cycloadducts, 1,2-λ5-azaphosphorines 4a-c. However, N-vinyliminotriphenylphosphorane reacts with dimethyl acetylenedicarboxylate (DMAD) in a formal [2+2] manner. The product 4a or 4b also reacts with DMAD to give λ5-phosphorine derivatives.
4,8-BIS(DICYANOMETHYLENE)-4,8-DIHYDROBENZO[1,2-c:4,5-c′]DITHIOPHENE. A NEW ELECTRON ACCEPTOR
Authors: Kobayashi Keiji
Published: July 2006

The title compound was designed as a new acceptor and was synthesized from the corresponding quinone and malononitrile. Electrochemical studies suggested that the molecule is not so much distorted as tetracyanoanthraquinodimethane.
XPS EVIDENCE FOR THE ORDER IN STABILITIES OF N,N,O-TERDENTATE COMPLEXES OF 2-(2-PYRIDYLAZO)PHENOLIC LIGAND WITH THE DIVALENT METALS
Authors: Kudo Yoshihiro , Yoshida Noboru , Fujimoto Masatoshi , Tanaka Katsumi , Toyoshima Isamu
Published: July 2006

The core electron binding energies of N(ls) and O(ls) in the eight complexes of an N,N,O-terdentate ligand, 5-dimethylamino-2-(2-pyridylazo)phenol, with divalent transition metals were measured by means of X-ray photoelectron spectroscopy (XPS). The results indicate that the thermodynamic stabilities of the N,N,O-terdentate chelates are controlled by the extent of the electron localization between the central metal and the donor nitrogen (azo and pyridyl) and oxygen (phenolate) atoms.
SEPARATION OF XYLENE ISOMERS BY PERVAPORATION THROUGH A HIGHLY PERMSELECTIVE POLYMER MEMBRANE HAVING DINITROPHENYL GROUP
Authors: Ishihara Kazuhiko , Matsui Kiyohide , Fujii Hideyuki , Nishide Hiroyuki , Shinohara Isao
Published: July 2006

The separation of xylene isomers was carried out by pervaporation through a polymer membrane having a dinitrophenyl group. The polymer membrane was effective for selective permeation of m-xylene from the mixture of xylene isomers. This selectivity can be attributed to the difference in the charge-transfer complexing ability between xylene isomers and the dinitrophenyl group.
PRODUCTION OF CO AND CH4 IN ELECTROCHEMICAL REDUCTION OF CO2 AT METAL ELECTRODES IN AQUEOUS HYDROGENCARBONATE SOLUTION
Authors: Hori Yoshio , Kikuchi Katsuhei , Suzuki Shin
Published: July 2006

The total analysis of gaseous and soluble products was carried out in the electrochemical reduction of CO2 (current density 5 mA cm−2) on various electrode metals. HCOO− was predominantly produced at Cd, In, Sn, and Pb cathodes. Ag and Au principally gave CO. CH4 was formed in an appreciable amount at Cu cathode.
RHODIUM-CATALYZED HYDROFORMYLATION OF FORMALDEHYDE IN PYRIDINES
Authors: Okano Tamon , Makino Masahiko , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

The use of pyridines as a solvent greatly enhances the catalytic activity of RhCl(CO)(PPh3)2 for the hydroformylation of formaldehyde. The yield of glycol aldehyde goes up to over 90% under mild conditions. At temperatures above 100 °C, however, the reaction is complicated by the aldol addition of glycol aldehyde yielding straight-chain sugars.
PALLADIUM ASSISTED OXIDATION OF CYCLOPENTENE BY MOLECULAR OXYGEN
Authors: Takehira Katsuomi , Hayakawa Takashi , Orita Hideo
Published: July 2006

Dichlorobis(N,N-dialkylacetamide)palladium(II) complex catalyzes the oxidation of cyclopentene to cyclopentanone by molecular oxygen in alcoholic solvent, in which one atom of molecular oxygen in incorporated.
INTRODUCTION OF gem-DILKYL GROUP TO HEXOFURANOSE BY ORTHO ESTER CLAISEN REARRANGEMENT
Authors: Tadano Kin-ichi , Idogaki Yoko , Yamada Hirohiko , Suami Tetsuo
Published: July 2006

The ortho ester Claisen rearrangement of d-ribo- or l-lyxo- hexofuranose derivative which possesses an allyl alcohol functionality on C-3, proceeds stereoselectively to give a 3-C-dialkylated product. The stereochemistry of a newly introduced quaternary center of the product was unambiguously established by a chemical modification.
PALLADIUM CATALYZED REACTION OF BUTADIENE MONOXIDE WITH CARBON DIOXIDE
Authors: Fujinami Tatsuo , Suzuki Takehiro , Kamiya Masakuni , Fukuzawa Shin-ichi , Sakai Shizuyoshi
Published: July 2006

Carbon dioxide readily reacts with 1,3-butadiene monoxide in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium under ordinary pressure at 0 °C to afford vinylethylene carbonate in a quantitative yield.
CATALYTIC ACTIVITY- AND SELECTIVITY-CONTROL FOR OXIDATIVE COUPLING OF METHANE BY OXYGEN-PUMPING THROUGH YTTRIA-STABILIZED ZIRCONIA
Authors: Otsuka Kiyoshi , Yokoyama Seiichiro , Morikawa Akira
Published: July 2006

Oxidative coupling of methane over Ag and Bi2O3–Ag were carried out by the electrochemically pumped oxygen through yttria-stabilized zirconia at 973 K. The oxygen pumped to the Bi2O3–Ag catalyst showed higher catalytic activity and selectivity for the production of C2-compounds (C2H4+C2H6) compared to the surface oxygen from gas phase.
ENANTIOSELECTIVE CONJUGATE ADDITION REACTION MEDIATED BY CHIRAL LIGANDS
Authors: Tomioka Kiyoshi , Sudani Mineichi , Shinmi Yuichi , Koga Kenji
Published: July 2006

Chiral ligand mediated enantioselective conjugate addition reaction of lithiated dithioacetal derivative with prochiral α,β-unsaturated ester gives the corresponding adduct in 67% enantiomeric excess.
AN EFFICIENT METHOD FOR THE PREPARATION OF THREO CROSS-ALDOLS FROM SILYL ENOL ETHERS AND ALDEHYDES USING TRITYL PERCHLORATE AS A CATALYST
Authors: Mukaiyama Teruaki , Kobayashi Shu , Murakami Masahiro
Published: July 2006

Threo cross-aldol products are predominantly formed in good yields by treating tert-butyldimethylsilyl enol ethers with aldehydes in the presence of a catalytic amount of trityl perchlorate.
THE CATALYSTS ACTIVE AND SELECTIVE IN OXIDATIVE COUPLING OF METHANE
Authors: Otsuka Kiyosbi , Jinno Kiyotaka , Morikawa Akira
Published: July 2006

Active and selective catalysts in oxidative coupling of methane were looked for over many metal oxides (25 oxides). In general, the oxides of rare earth elements showed higher C2-sel ectiviti.es than 75%. Among the metal oxides tested, Sm2O3 was the most active and selective catalyst in the formation of C2-compounds (selectivity 93%).
A HIGHLY REGIO- AND STEREOSELECTIVE RING-OPENING OF 2,3-EPOXY ALCOHOLS WITH TRIMETHYLSILYL AZIDE-DIETHYLALUMINUM FLUORIDE SYSTEM
Authors: Maruoka Keiji , Sano Hiromi , Yamamoto Hisashi
Published: July 2006

A new approach to the mild and selective synthesis of 3-azidodiols has been described which involves a highly regio-and stereoselective ring-opening of 2,3-epoxy alcohols with trimethylsilyl azide and diethylaluminum fluoride.
1H-NMR SPECTROSCOPIC EVIDENCE ON CHIRAL DISCRIMINATION OF dl-PIRPROFEN BY β-CYCLODEXTRIN COMPLEXATION
Authors: Uekama Kaneto , Imai Teruko , Hirayama Fumitoshi , Otagiri Masaki , Hibi Toru , Yamasaki Masaki
Published: July 2006

The chiral discrimination of β-cyclodextrin (β-CyD) was demonstrated by measuring 270 MHz 1H-NMR spectra, using dl-pirprofen (PF) as a guest molecule. Upon binding to β-CyD, the induced 1H-chemical shifts of PF, particularly in the phenylpropionic acid portion, were significantly different between the d- and l-isomers, while no enantiometric difference was observed in the absence of β-CyD.
THE OXIDATION OF HYDROXYLAMINE BY FREMY’S SALT. PREPARATION OF N-NITROSAMINES AND TETRAZENES
Authors: Tato M P Vazaquez , Castedo Luis , Riguera Ricardo
Published: July 2006

Treatment of secondary amines with Fremy’s salt in aqueous sodium carbonate solution and in the presence of hydroxylamine gives a high yield of either N-nitrosamines or sym-tetrazenes. A mechanism for these conversions is proposed.
REDUCTION OF ALDEHYDES AND KETONES TO ALCOHOLS WITH HYDROUS ZIRCONIUM OXIDE AND 2-PROPANOL
Authors: Matsushita Hajime , Ishiguro Shigeo , Ichinose Hiroshi , Izumi Akira , Mizusaki Shigenobu
Published: July 2006

Reduction of aldehydes and ketones with 2-propanol was found to proceed efficiently in the presence of hydrous zirconium oxide. The reaction is performed simply and the products are easily isolated in the pure state by filtering off the hydrous zirconium oxide, followed by evaporation of solvents.
NEW LIQUID CRYSTALLINE COMPOUNDS. 2-(p-CYANOPHENYL)-5-ALKYL-1,3-OXATHIANES
Authors: Haramoto Yuichiro , Kamogawa Hiroyoshi
Published: July 2006

2-(p-Cyanophenyl)-5-alkyl-1,3-oxathianes having the monotropic nematic liquid-crystal phase around room temperature were synthesized and their liquid-crystal behavior was compared with those of the corresponding 1,3-dithianes and 1,3-dioxanes.
OXIDATION OF 2-METHYLNAPHTHALENE TO 2-METHYL-1,4-NAPHTHOQUINONE WITH HYDROGEN PEROXIDE IN THE PRESENCE OF Pd(II)-POLYSTYRENE SULFONIC ACID RESIN
Authors: Yamaguchi Satoru , Inoue Masami , Enomoto Saburo
Published: July 2006

The oxidation of 2-methylnaphthalene was carried out in acetic acid with aqueous(60%) hydrogen peroxide in the presence of Pd(II)-polystyrene sulfonic acid resin. 2-Methyl-1,4-naphthoquinone was obtained in a yield of 50 to 60% at 50 °C for 8 h. The catalysts recovered by the filtration were reusable.
HIGH CATALYTIC ACTIVITY OF CsCl SUPPORTED ON SILICA GEL FOR THE SELECTIVE DEHYDROCHLORINATION OF 1,1,2-TRICHLOROETHANE
Authors: Mochida Isao , Miyazaki Tatsuro , Takagi Takeshi , Fujitsu Hiroshi
Published: July 2006

CsCl supported on a particular silica gel dryed at 120 °C exhibited a remarkable activity for the selective dehydrochlorination of TCE into 1,1-DCE after the calcination around 500 °C. The proper heat-treatment before and after the impregnation of CsCl on the silica gel strongly influenced the activity of the catalyst.
FACILE REDUCTION OF BENZENETHIOL ESTER UNDER MILD CONDITIONS WITH ZINC BOROHYDRIDE
Authors: Kotsuki Hiyoshizo , Yoshimura Naka , Ushio Yasuyuki , Ohtsuka Tatsuya , Ochi Masamitsu
Published: July 2006

Benzenethiol esters are efficiently reduced to alcohols under mild conditions by treatment with zinc borohydride prepared from zinc chloride and sodium borohydride.
An SnCl2-Promoted α-Methylene-γ-butyrolactone Synthesis in an Aqueous Medium
Authors: Uneyama Kenji , Ueda Kunimasa , Torii Sigeru
Published: July 2006

Reaction of α-bromomethylacrylic acid with aldehydes in an SnCl2–MeOCH2CH2OH–H2O system provides γ-substituted-α-methylene-γ-butyrolactones.
New Diterpenes from Alpinia galanga WILD.
Authors: Morita Hiroshi , Itokawa Hideji
Published: July 2006

Two new skeleton diterpenes(galanal A and B) and a new labdane type diterpene were isolated from the seeds of Alpinia galanga WILD.(Zingiberaceae) with (E)-8, 17-epoxy-labd-12-ene-15, 16-dial and their structures were established by the spectral evidences.
A Novel Type of Organic Semiconductors. Molecular Fastener
Authors: Inokuchi Hiroo , Saito Gunzi , Wu Peiji , Seki Kazuhiko , Tang Tong Bor , Mori Takehiko , Imaeda Kenichi , Enoki Toshiaki , Higuchi Yoshiki , Inaka Koji , Yasuoka Noritake
Published: July 2006

The electrical conductivity of alkylthio-substituted tetrathiafulvalene (TTCn-TTF) single crystal has been measured in a vacuum of 10−4 Pa with the two probe method. The room temperature dark conductivity of TTC10-TTF reaches 10−5 S cm−1, a value that is extraordinarily high compared with those of other organic semiconductors constructed with a single component. The cause of this high conductivity is that the central tetrathiafulvalene skeleton has been fastened strongly with the four long alkyl chains.
“Counter” Phase Transfer Catalysis by Water-soluble Phosphine Complexes. Catalytic Reduction of Allyl Chlorides and Acetates with Sodium Formate in Two-phase Systems
Authors: Okano Tamon , Moriyama Yoshiyuki , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

In the reduction of allyl chlorides and acetates with sodium formate in a heptane-water two-phase system, water-soluble palladium complexes function as a novel type of catalyst which transports the substrate into the aqueous phase and causes it to react with sodium formate.
The Redox Potential of a Synthetic Fe4S4 Cluster. Protonation/Deprotonation Equilibria of the Oxidized and Reduced Species
Authors: Masanaga Mari , Kuwabata Susumu , Tanaka Koji , Tanaka Toshio
Published: July 2006

The redox potential of [Fe4S4(S-p-C6H4C8H17n)4]2− in an aqueous poly-α-dimethylamino-ε-capramide solution is shifted by −55 mV/pH in the pH range 6.0 to 8.5 at 4 °C, suggesting that not only the oxidized but also reduced forms of the cluster undergo protonation/deprotonation equilibria. The spread of the redox potential of the cluster in the present study covers most of the redox potentials of 4-Fe ferredoxins reported so far.
Behavior Characteristic of (η5-Cyclopentadienyl)(1,2-di-2-pyridyl-1,2-ethylenedithiolato)cobalt(III) and Its Diselenolato Analog. Elimination of 2S or 2Se and Exchange of S and Se
Authors: Kajitani Masatsugu , Ito Mari , Kobayashi Norikazu , Akiyama Takeo , Sugimori Akira
Published: July 2006

(η5-Cyclopentadienyl)(1,2-di-2-pyridyl-1,2-ethylendithiolato)cobalt(III) (1) and its selenium analog (2) show interesting reactivities at the S and Se moiety. A characteristic peak in MS of 1 and 2 measured using a direct inlet system under heating is found at m/z=304 assigned to ((M-2S)+ or (M-2Se)+). The reflux of 2 in toluene with S8 causes the exchange of Se by S in the complex.
Carboxylic Acids in the Yamato-791198 Carbonaceous Chondrites from Antarctica
Authors: Shimoyama Akira , Naraoka Hiroshi , Yamamoto Hiroshi , Harada Kaoru
Published: July 2006

Monocarboxylic acids were detected from the Yamato-791198 carbonaceous chondrite(C2). These organic acids include aliphatic and aromatic structures with the most of structural isomers of the C4, C5, and C6 acids. These compounds are abiotic in origin and the products in the early solar system.
[2,3]Wittig Rearrangements of “Lithium Enolates” Generated from α-Allyloxy Esters, Ketones, and Oximes. Some Implications of the Enolate Structures
Authors: Takahashi Osamu , Saka Takahiro , Mikami Koichi , Nakai Takeshi
Published: July 2006

The lithium ester and ketone enolates (generated in HMPA-THF) and the dilithiated oxime (generated in THF) are shown to serve well as the migrating terminus for the [2,3]Wittig shift, not for the [3,3]Claisen shift. On the basis of these observations, the solution structures of the “lithium enolates” are discussed.
Pd(O)-CATALYZED ELECTROREDUCTIVE CARBOXYLATION OF ARYL HALIDES, β-BROMOSTYRENE, AND ALLYL ACETATES WITH CO2
Authors: Torii Sigeru , Tanaka Hideo , Hamatani Takeshi , Morisaki Kazuo , Jutand Anny , Peluger F , Fauvarque J-F
Published: July 2006

Electroreductive carboxylation of aryl halides, β-bromostyrene, and allyl acetates has been performed in an aprotic solvent saturated with carbon dioxide in the presence of a catalytic amount of PdCl2(Ph3P)2 and/or Pd(Ph3P)4.
Determination of Palladium(II) with Coproporphyrin III by Using Zephiramine-Perchlorate Ion-Pair Scum as a New Medium for Room Temperature Phosphorescence
Authors: Endo Kazutoshi , Igarashi Shukuro , Yotsuyanagi Takao
Published: July 2006

Palladium(II) complex of coproporphyrin III was adsorbed on zephiramine-perchlorate ion-pair scum, on which the complex emitted room temperature phosphorescence (RTP). The peak to peak height calibration curve of the first-derivative of the RTP spectra was linear over the concentration range of 10−7 mol dm−3 to 10−8 mol dm−3 of Pd(II).
Aminolysis of Triphenylantimony Dicarboxylates and Its Application to Catalytic Amidation
Authors: Nomura Ryoki , Wada Takao , Yamada Yasuhiro , Matsuda Haruo
Published: July 2006

Triphenylantimony dicarboxylates (Ph3Sb(O2CR)2, where R=Me, CF3, Ph and CH2NH-Z) readily reacted with amines (R′NH2, where R′=n-C6H13, s-Bu, C6H11, and Ph) to afford corresponding amides and triphenylstibine oxide in fairly good yields. The amidation of RCO2H with R′NH2 was also catalyzed by the orgnoantimony compounds.
Synthesis of Methyl Azulen[1,2-b]azulene-2-carboxyl ate and Dimethyl Azulen[1,2-b]azulene-2,4-dicarboxylate
Authors: Kuroda Shigeyasu , Hirooka Syuzi , Iwaki Hiroyuki , Ikeda Mariko , Nakao Takeshi , Ogisu Masahiro , Yasunami Masafumi , Takase Kahei
Published: July 2006

The titled compounds were synthesized. The complete assignment of 1H-NMR spectrum of methyl azulen[1,2-b]azulene-2-carboxylate and the rearrangement of ester group on seven membered ring in the dehydrogenation reaction are described.
OXIDATIVE COUPLING OF URACIL DERIVATIVES WITH MALEIMIDES BY PALLADIUM ACETATE
Authors: Itahara Toshio
Published: July 2006

Treatment of uracil derivatives and maleimides in the presence of palladium acetate gave the coupling products.
FACILE ELECTROGENERATION OF A 17-ELECTRON SPECIES FROM AN INERT HYDRIDOPHOSPHONITECOBALT(I) FOR CATALYTIC DOUBLE-BOND MIGRATION OF 3-PHENYLPROPENE
Authors: Onishi Masayoshi , Hiraki Katsuma , Ishida Yasuhiro , Dakeshita Kengo
Published: July 2006

A thermally inert hydridophosphonitecobalt(I) complex [CoH{PPh(OEt)2}4] was electrochemically oxidized to give a 17-electron Co(II) species, which catalyzed double-bond migration of 3-phenylpropene. On the other hand, the Co(III) species electrogenerated similarly showed only limited catalytic activity.
TRICHLOROLANTHANOID(LnCl3)-CATALYZED FRIEDEL–CRAFTS ALKYLATION REACTIONS
Authors: Mine Norioki , Fujiwara Yuzo , Taniguchi Hiroshi
Published: July 2006

The usual Friedel–Crafts catalysts cannot be re-used after aqueous work-up. An alternative catalyst, based on rare earths has been found, which serves as an efficient Friedel–Crafts catalyst for alkylation of arenes by alkyl halides, and can be re-used after the reaction. Typical examples are shown in the reaction of benzene with benzyl halides using all of the rare earth trichlorides as catalyst, except PmCl3.
THE CATALYSTS ACTIVE AND SELECTIVE IN OXIDATIVE COUPLING OF METHANE. ALKALI-DOPED SAMARIUM OXIDES
Authors: Otsuka Kiyoshi , Liu Qin , Hatano Masaharu , Morikawa Akira
Published: July 2006

Conversion of methane to C2-hydrocarbons was tested on alkalidoped samarium oxides under the reaction conditions(T=1023K, P(CH4)=5.1 kPa, P(CH4)/P(O2)=5/2, W/F=600 g l−1s). Among the catalysts tested, Li-doped samarium oxide was the most active and selective catalyst in the formation of C2-compounds (C2-yield 21%).
STRUCTURE AND SYNTHESIS OF 11,12,13-TRIHYDROXY-9Z,15Z-OCTADECADIENOIC ACIDS FROM RICE PLANT SUFFERING FROM RICE BLAST DISEASE
Authors: Kato Tadahiro , Yamaguchi Yoshihiro , Ohnuma Shin-ichi , Uyehara Tadao , Namai Tsuneo , Kodama Mitsuaki , Shiobara Yoshinori
Published: July 2006

Structural elucidation including the absolute configuration was carried out on the trihydroxyoctadecadienoic acids isolated from rice plant suffering from rice blast disease.
CHARGE-CONTROLLABLE MEMBRANE. POLYPYRROLE-POLYELECTROLYTE COMPOSITE MEMBRANE THROUGH ANODIC DOPING PROCESS
Authors: Iyoda Tomokazu , Ohtani Akira , Shimidzu Takeo , Honda Kenichi
Published: July 2006

A new PPy composite membrane with PE was prepared by electropolymerization of py in the presence of PE. The PPy/PE film had highly tensile strength, and played a role as ‘charge-controllable membrane’. A novel idea on the immobilized polymer dopant of PPy was presented.
A SELECTIVE 1,2-REDUCTION OF γ-AMINO-α,β-UNSATURATED ESTERS BY MEANS OF BF3·OEt2-DIBAL-H SYSTEM. HIGHLY VERSATILE CHIRAL BUILDING BLOCKS FROM α-AMINO ACIDS
Authors: Moriwake Toshio , Hamano Shin-ichi , Miki Daiya , Saito Seiki , Torii Sigeru
Published: July 2006

A combination of DIBAL-H with BF3·OEt2 has been demonstrated to be a promising agent for a selective 1,2-reduction of γ-amino-α,β-unsaturated esters, which, otherwise, is difficult to realize and provides the route to potent chiral building blocks from α-amino acids.
CO GAS SENSITIVITIES OF REDUCED PEROVSKITE OXIDE LaCoO3−x
Authors: Arakawa Tsuyoshi , Takada Ken-ichi , Tsunemine Yoshikazu , Shiokawa Jiro
Published: July 2006

The detection of CO gas was studied using LaCoO3−x as a sensing material which was obtained by reduction of LaCoO3 in a hydrogen atmosphere at 500 °C. LaCoO3−x exhibits the change of the resistivity at low temperatures in the presence of hydrogen and has a sensitivity-temperature profile with a maximum at about 100 °C. CO adsorption causes a decrease in the resistivity of LaCoO3−x as in the case of O2 adsorption although LaCoO3−x is a p-type semiconductor.
THE CRYSTAL STRUCTURE OF β′-(BEDT-TTF)2ICl2. A MODIFICATION OF THE ORGANIC SUPERCONDUCTOR, β-(BEDT-TTF)2I3
Authors: Kobayashi Hayao , Kato Reizo , Kobayashi Akiko , Saito Gunzi , Tokumoto Madoka , Anzai Hiroyuki , Ishiguro Takehiko
Published: July 2006

The crystal of β′-(BEDT-TTF)2ICl2 has a modified structure of organic superconductor, β-(BEDT-TTF)2I3. Unlike the β-type salt with a two-dimensional(2D) electronic structure, the anisotropy of the intermolecular overlap integrals of HOMO of BEDT-TTF in β′-(BEDT-TTF )2ICl2 suggests the 1D character of the electronic structure.
PRODUCTION OF METHANE AND ETHYLENE IN ELECTROCHEMICAL REDUCTION OF CARBON DIOXIDE AT COPPER ELECTRODE IN AQUEOUS HYDROGENCARBONATE SOLUTION
Authors: Hori Yoshio , Kikuchi Katsuhei , Murata Akira , Suzuki Shin
Published: July 2006

The electrochemical reduction of CO2 was studied with galvanostatic (5 mA cm−2) electrolysis at a copper electrode between 0 and 40 °C. The production of CH4 and C2H4 was confirmed by GC with 4 different columns. The faradaic efficiency of CH4 formation was about 65% at 0 °C and dropped with an increase of temperature, whereas that of C2H4 formation rose to ca. 20% at 40 °C.
STRIKINGLY HIGH PHOTOVOLTAGES OF PHOTOELECTROCHEMICAL SOLAR CELLS EQUIPPED WITH PLATINUM-COATED AND ALKALI-ETCHED n-Si ELECTRODES
Authors: Nakato Yoshihiro , Yano Hiroyuki , Tsubomura Hiroshi
Published: July 2006

Open-circuit photovoltages (Voc) of photoelectrochemical cells having an n-Si electrode coated with vacuum-evaporated platinum in an aqueous redox solution have been remarkably increased by etching the Pt-coated n-Si electrode in alkaline solutions. The maximum Voc obtained was 0.685 V, about 15% higher than that of normal p-n junction Si solar cells (0.59 V), demonstrating the possibility of using these cells as highly efficient solar energy converter. The large increase in Voc is explained by a theory recently proposed by us on semiconductor electrodes coated with microscopically discontinuous metal layers.
Highly Selective Methods for α-Alkenylation and α-Arylation of Ketones via Palladium- or Nickel-Catalyzed Cross Coupling
Authors: Negishi Ei-ichi , Akiyoshi Kazunari
Published: July 2006

Two procedures for α-alkenylation and α-arylation of ketones, that permit, for the first time, introduction of a stereo-defined alkenyl group (E or Z) in the α-position of cyclic ketones in high yields with essentially complete retention (>98%) of the alkenyl stereochemistry are reported. Furthermore, the one that is represented by Eq.2 permits complete control of regiochemistry as well.
Palladium(0)-catalyzed Cycloaddition of Activated Vinylcyclopropanes with Aryl Isocyanates
Authors: Yamamoto Keiji , Ishida Toru , Tsuji Jiro
Published: July 2006

Zwitterionic π-allylpalladium complexes formed by a reaction of activated vinylcyclopropanes with Pd(0) complexes as a catalyst react with aryl isocyanates (or diphenylketene) to give five-membered cycloaddition products in good yields.
Pd-Catalyzed Selective One-Step Synthesis of (β-Naphthoic Acid from Naphthalene and CO
Authors: Jintoku Tetsuro , Taniguchi Hiroshi , Fujiwara Yuzo
Published: July 2006

β-Naphthoic acid can be prepared in more than 80% selectivity via one-step carboxylation of naphthalene with carbon monoxide by the Pd/phenanthroline catalyst systems. Pd(0) species such as Pd black are found to be active catalysts as well as Pd(OAc)2. Addition of O2 increases the yield.
Conversion of 3-Acetoxy-6-acetoxymethyl-2H-pyran-2-one to Cyclopentenone Derivatives and 1,3-Cyclopentanedione
Authors: Tajima Kiyohiko
Published: July 2006

Simple synthetic routes to 2-cyclopentenone derivatives and 1,3-cyclopentanedione from 3-acetoxy-6-acetoxymethyl-2H-pyran-2-one were developed.
Conversion of Cyclic Aziridines and 2-Amino-1-cycloalkanols to Keto Nitriles by Using Electrogenerated Reactive Halogen Species
Authors: Torii Sigeru , Inokuchi Tsutomu , Takagishi Sadahito , Sato Etsuji , Tsujiyama Hiromi
Published: July 2006

Oxidative cleavage of C(1)–C(2) bond of aziridines and 2-amino-1-cycloalkanols, giving the corresponding keto nitriles, exclusively, have been performed by oxidation with electrogenerated reactive halogen species (e.g., [Cl]+).
Spirobrassinin, a Novel Sulfur-containing Phytoalexin from the Daikon Rhaphanus sativus L. var. hortensis (Cruciferae)
Authors: Takasugi Mitsuo , Monde Kenji , Katsui Nobukatsu , Shirata Akira
Published: July 2006

The isolation and structure elucidation of spirobrassinin, the first phytoalexin of oxindole structure from the daikon Raphanus sativus L. var. hortensis, is described.
Cyanine Dye-Cyclodextrin Systems. Enhanced Dimerization of the Dye
Authors: Kasatani Kazuo , Ohashi Masafumi , Kawasaki Masahiro , Sato Hiroyasu
Published: July 2006

3-Cyclodextrin (CD), as well as γ-CD, enhances dimerization of some cyanine dyes, as revealed by the enhancement of dimer band in absorption spectra. The presence and absence of enhancement are governed by geometrical factors, i.e., the length of central methine chain and the size of the chromophore at each end.
Isospongiadiol, a Cytotoxic and Antiviral Diterpene from a Caribbean Deep Water Marine Sponge, Spongia sp.
Authors: Kohmoto Shigeo , Mcconnell Oliver J , Wright Amy , Cross Sue
Published: July 2006

Spongiadiol, epispongiadiol, and isospongiadiol, a novel furanoditerpene with cytotoxic and antiviral activity, were isolated from a Caribbean deep water marine sponge, Spongia sp. Isospongiadiol was identified by spectral and chemical methods as a regioisomer of spongiadiol and epispongiadiol.
Activation of Methane on the MgO Surface at Low Temperatures
Authors: Ito Tomoyasu , Tashiro Toshihiko , Watanabe Tomoko , Toi Keio , Ikemoto Isao
Published: July 2006

The C–H bond of methane is easily activated on the MgO surface even below room temperature. Active sites consist of intrinsic ion pairs, O3C2−–Mg3C2+ and O4C2+, of MgO in low coordination states on which a methane molecule adsorbs in heterolytically dissociated form.
Photoreaction of 5-Bromo-1,3-dimethyluracil with 1,4-Xylene. The Effect of Acid
Authors: Seki Koh-ichi , Matsuda Kohki , Ohkura Kazue
Published: July 2006

The photoreaction of 5-bromo-1,3-dimethyluracil in 1,4-xylene solution yields a mixture of 5- and 6-aryl substituted uracils. The 5-isomer is formed first and is followed by the 6-isomer, the latter being the product from protonated uracil. In the presence of initially added acid (HBr and trifluoroacetic acid) both isomers are formed simultaneously.
New Method for Oxidative Carbon-carbon Bond Formation by the Reaction of Allyl Ethers, 2,3-Dichloro-5,6-dicyano-p-benzoquinone(DDQ) and Silyl Carbon Nucleophiles
Authors: Hayashi Yujiro , Mukaiyama Teruaki
Published: July 2006

Allyl ethers are oxidized by DDQ to generate the corresponding cationic species, which in turn react with silyl carbon nucleophiles in the presence of a catalytic amount of lithium perchlorate to afford the coupled products in a one-pot procedure in good yields.
Palladium Catalyzed Hydroxylation of Benzene with O2 or H2O via the C–H Aromatic Bond Activation. Preparation of Phenol
Authors: Jintoku Tetsuro , Taniguchi Hiroshi , Fujiwara Yuzo
Published: July 2006

Benzene reacts with O2 (15 bar) to give phenol directly in a high yield via the direct phenyl C–H bond activation promoted by some Pd based catalysts/CO(15 bar)/1,10-phenanthroline systems. Addition of both CO (15 bar) and phenanthroline or bipyridine is needed for the selective synthesis of phenol. Benzene also reacts with H2O to give phenol by the catalysis of a 5% Pd–C catalyst.
Asymmetric Synthesis of Phosphine Oxides with the Arbuzov Reaction
Authors: Kato Takayuki , Kobayashi Kimiko , Masuda Shinji , Segi Masahito , Nakajima Tadashi , Suga Sohei
Published: July 2006

The Arbuzov reaction of (5S,6S)-dimethoxy-2-phenyl-1,3,2-dioxaphosphacycloheptane with various alkyl halides produced acyclic phosphinates in a moderate to high diastereomer excess. The same reaction of (1S,7S)-9,9-dimethyl-4-phenyl-3,5,8,10,4-tetraoxaphosphabicyclo[5.3.0]decane with the alkyl halides needed the more vigorous reaction conditions and gave phosphinates in a low diastereomer excess. These phosphinates were converted into optically active phosphine oxides.
Photochromic Solid Films Prepared by Doping with Donor–Acceptor Norbornadienes
Authors: Miki Sadao , Asako Yoshinobu , Yoshida Zen-ichi
Published: July 2006

Thin solid films of PMMA doped with donor–acceptor norbornadienes were prepared, and their photochromic properties were examined. The photochromic solid films have absorption at a visible region, and their photochemical decolorization due to valence isomerization proceeded in high quantum yields. They show resistivity for the repeated cycle of the interconversions and no loss in the extinction was observed even after 103 times of cycle of reactions.
Hydrogenation of Benzene Ring by Paired Electrosynthesis with Raney-Nickel Cathode
Authors: Yamada Tsukasa , Osa Tetsuo , Matsue Tomokazu
Published: July 2006

Paired electrolysis with 1,4-dimethoxybenzene (1) as a substrate was studied. Hydrogenation of the aromatic ring occurred to produce 1,4-cyclohexanedione (4) and two derivatives on Raney-nickel cathode. Two derivatives were converted into 4 by treatment of HCl aqueous solution. The total yield of 4 was 60% based on 1, whereas 4 was not formed on a platinum or lead cathode.
Enantiodivergent Synthesis of Both Enantiomers of Sulcatol and Matsutake Alcohol from (R)-Epichlorohydrin
Authors: Takano Seiichi , Yanase Masashi , Takahashi Michiyasu , Ogasawara Kunio
Published: July 2006

Enantiodivergent synthesis of both enantiomers of sulcatol, an aggregation pheromone of Gnathotrichus sulcatus, and matsutake alcohol, a flavor compound of the mushroom Tricholoma matsutake, has been established using (R)-epichlorohydrin as common chiral precursor.
The Esterification of Oleic Acid with Ethanol Accompanied by Membrane Separation
Authors: Kita Hidetoshi , Tanaka Kazuhiro , Okamoto Ken-ichi , Yamamoto Masuji
Published: July 2006

The use of water-permeable membranes for gas separation in the esterification of oleic acid with ethanol was studied. The perfect conversion due to the equilibrium shift was obtained by using a polyimide membrane for removal of water vapor generated by the esterification.
A Novel Sugar–sugar Interaction in a Transition Metal Complex. X-Ray Crystal Structure of N,N-Di(N-d-mannosyl-2-aminoethyl)ethylenediamine Nickel(II) Dichloride Methanol, [Ni(N,N′-(d-Man)2-tren)]Cl2·CH3OH
Authors: Yano Shigenobu , Takahashi Toshikazu , Sato Yutaka , Ishida Katsuaki , Tanase Tomoaki , Hidai Masanobu , Kobayashi Kimiko , Sakurai Tosio
Published: July 2006

The synthesis and crystal structure of the nickel(II) complex, [Ni(N,N′-(d-Man)2-tren]Cl2·CH3OH containing two N-glycosides derived from the reaction of d-mannose (d-Man) and N,N-di(2-aminoethyl)ethylenediamine (tren) are reported. The suagr part in the complex involves novel intramolecular sugar–sugar hydrogen bondings around the metal center.
Nickel(0)-catalyzed Synthesis of Diaryl Sulfides from Aryl Halides and Aromatic Thiols
Authors: Takagi Kentaro
Published: July 2006

Facile and selective syntheses of various diaryl sulfides from aryl halides and aromatic thiols by the aid of an in situ generated nickel(0) catalyst are reported. The nickel(0) induces a C–S cleavage, as well.
(2S,3S)-1-Phenylthio-2,3-butanediol. A Useful Chiral Building Block for a Simple Syntheses of (4R,5S)-5-Hydroxyhexan-4-olide and (4R,5S)-5-Hydroxy-2-hexen-4-olide
Authors: Fujisawa Tamotsu , Kojima Eiji , Sato Toshio
Published: July 2006

(4R,5S)-5-Hydroxyhexan-4-olide and (4R,5S)-5-hydroxy-2-hexen-4-olide were easily synthesized from (2S,3S)-1-phenylthio-2,3-butanediol, obtained by the bakers’ yeast reduction of 1-phenylthio-2,3-butanedione.
Two-Step Synthesis of Furans by Mn(III)-Promoted Annulation of Enol Ethers
Authors: Corey E J , Ghosh Arun K
Published: July 2006

Enol ethers, β-dicarbonyl compounds and the Mn(III) reagent Mn3O(OAc)7 react under mild conditions to form 1-alkoxy-1.2-dihydrofurans in good (70–98%) yields. The latter are readily converted to furans by acid-catalyzed elimination of ROH.
Enantioselective Photocyclization of Nitrones into Oxaziridines in a Crystalline Inclusion Complex with Optically Active 1,6-Di(o-chlorophenyl)-1,6-diphenylhexa-2,4-diyne-1,6-diol
Authors: Toda Fumio , Tanaka Koichi
Published: July 2006

Irradiation of complexes of nitrones with the title host compound in the solid state gave optically active oxaziridines in 100% enantiomeric excess.
Lithium Ion-selective Electrodes Based on 1,10-Phenanthroline Derivatives
Authors: Sugihara Hideki , Okada Tatsuhiro , Hiratani Kazuhisa
Published: July 2006

Polyvinyl chloride membrane electrodes based on 2,9-dialkyl-1,10-phenanthrolines exhibit excellent selectivity for Li+ relative to Na+, K+, Mg2+, and Ca2+.
Superconducting Y–Ba–Cu–O Films with Tc>70 K Prepared by Thermal Decomposition Technique of Y-, Ba-, and Cu-2ethylhexanoates
Authors: Nasu Hiroyuki , Makida Seigo , Kato Takeshi , Ibara Yoshikazu , Imura Takeshi , Osaka Yukio
Published: July 2006

High Tc superconducting Y–Ba–Cu–O films with Tc(end)>70 K were prepared on yttria stabilized zirconia substrates by the thermal decomposition technique using Y-, Ba-, and Cu-2ethylhexanoates. The observed Tc(onset) was 95 K and Tc(end) was 72 K, and they are currently the highest Tc values for films obtained from organic acid salts.
The Synthesis of 2′,3′-Dideoxycytidine and Its 2′-Azido Analogue. Applications of the Deoxygenative [1,2]-Hydride Shift of Sulfonates with Mg(OMe)2–NaBH4
Authors: Kawana Masajiro , Yamasaki Noritsugu , Nishikawa Masahiro , Kuzuhara Hiroyoshi
Published: July 2006

New synthetic routes to the title compounds from cytidine were developed. Key intermediates were prepared by the deoxygenative reduction of 3′-O-mesylcytidine derivatives with the title reagents in a one-pot procedure.
Reactions of (η5-Cyclopentadienyl)(1,5-cyclooctadiene)cobalt(I), Diphenylacetylene, and a Mixture of S8 and Se8. Formation of (η5-Cyclopentadienyl)(1,2-diphenyl-2-selenolatoethylenethiolato-S,Se)cobalt(III) Complex
Authors: Kajitani Masatsugu , Ochiai Ryuji , Kobayashi Norikazu , Akiyama Takeo , Sugimori Akira
Published: July 2006

(η5-Cyclopentadienyl)(1,2-diphenyl-2-selenolatoethylenethiolato-S,Se)cobalt(III) (1) is formed in the reaction of CpCo(1,5-cyclooctadiene) (4), Ph–C≡C-Ph (5), and a mixture of S8 and Se8, together with the dithiolato and diselenolato complexes. A possible mechanism for the formation of 1 is the attack of 5 to some S,Se-mixed clusters which are formed in the reaction of 4 with Se8 and S8.
Efficiently Catalytic C–H Activation. Direct and Mild Carbonylation of Benzene and Cyclohexane by RhCl(CO)(PMe3)2 under Irradiation
Authors: Sakakura Toshiyasu , Tanaka Masato
Published: July 2006

A high turnover number was achieved in the photo-assisted carbonylation of C–H bonds of benzene catalyzed by RhCl(CO)(PMe3)2 under mild conditions (1 atm, 37 °C) to give mainly benzaldehyde. Cyclohexane could also be carbonylated under the same conditions.
Fluoride-promoted Epoxidation of α,β-Unsaturated Compounds
Authors: Miyashita Masaaki , Suzuki Toshio , Yoshikoshi Akira
Published: July 2006

The epoxidation of α,β-unsaturated compounds using tetrabutylammonium fluoride is described. This method has been demonstrated to be directly applicable to base-sensitive substrates such as cinnamaldehyde and α-phenylcinnamonitrile.
Michael Addition of Acetonitrile to Chalcones under Ultrasound Irradiation
Authors: Shibata Katsuyoshi , Urano Katsuyoshi , Matsui Masaki
Published: July 2006

When chalcones were treated with potassium superoxide (KO2) in acetonitrile under ultrasound irradiation, chalcone-acetonitrile adducts were obtained in moderate yields.
Superconductivity and Lattice Parameters in (La1−xSrx)2CuO4−δ Solid Solution System
Authors: Kanbe Shinsaku , Kishio Kohji , Kitazawa Koichi , Fueki Kazuo , Takagi Hidenori , Tanaka Shoji
Published: July 2006

The superconducting critical temperature TC increased with increase in x in (La1−xSrx)2CuO4−δ associated with the shortening of the Cu–O bond in the basal plane and the elongation of the lattice along the c-axis in the K2NiF4. structure. The results are discussed in terms of two-dimensional itinerant band formation of Cu:dx2-y2–O:pσ bond.
Cobalt Salts-Catalyzed Carbonylation of Aromatic Halides under Photostimulation
Authors: Kudo Kiyoshi , Shibata Tadashi , Kashimura Tsugunori , Mori Sadayuki , Sugita Nobuyuki
Published: July 2006

A novel method for the carbonylation of aromatic halides by the cobalt salt catalysts such as Co(OAc)2·4H2O, CoCl2·6H2O, CoSO4·7H2O, Co(OH)2, Co(OH)3, CoO,and Co2O3 was investigated in an aqueous alkaline solution under photostimulation. These salts were found to have a catalytic activity as high as that of Co2(CO)8 under mild conditions.
Preparation of New Solid Superbase and Its Catalytic Activity
Authors: Suzukamo Gohfu , Fukao Masami , Minobe Masao
Published: July 2006

A solid superbase whose basicity (H−) was higher than 37 was prepared by the successive treatment of γ-alumina with sodium hydroxide and sodium at 280–350 °C under nitrogen. The base was highly effective in the catalytic isomerization of 5-vinylbicyclo[2.2.1]hept-2-ene to 5-ethylidenebicyclo[2.2.1]hept-2-ene.
Synthesis of Peptides Containing α,α′-Iminodicarboxylic Acids
Authors: Yamada Takashi , Motoyama Noboru , Taniguchi Teiji , Kazuta Yasuaki , Miyazawa Toshifumi , Kuwata Shigeru , Matsumoto Kiyoshi , Sugiura Makiko
Published: July 2006

The peptides containing α,α′-iminodicarboxylic acids which are hardly prepared by the conventional methods of peptide synthesis, were well synthesized by the four-component condensation. The diastereomers were isolated, and their configurations were determined.
Transition-Metal Complex Catalyzed Perfluoroalkylation. A Facile Synthesis of Fluorine-Containing Esters by Carbo-Carbonylation of Alkynes and Alkenes
Authors: Urata Hisao , Yugari Hideki , Fuchikami Takamasa
Published: July 2006

Palladium-catalyzed reaction of perfluoroalkyl iodides with terminal alkynes or alkenes in alcohols under carbon monoxide pressure in the presence of potassium carbonate directly gives β-perfluoroalkyl-substituted alkenoates or alkanoates, respectively.
Stereoselective Selenolactonization by Superelectrophilic Benzeneselenenyl Triflate
Authors: Murata Shizuaki , Suzuki Toshiyasu
Published: July 2006

Benzeneselenenyl triflate is prepared from benzeneselenenyl chloride and silver trifluoromethanesulfonate. It performs selenium-induced cyclization of β,γ-, γ,δ-, and δ,ε-unsaturated carboxylic acids.
Selective Reduction of Aromatic Aldehyde in The Presence of Aromatic Ketone by NaBH4 and SnCl2 in THF
Authors: Ono Aoi , Hayakawa Hiroshi
Published: July 2006

Aromatic aldehydes were more selectively reduced to the corresponding alcohols than the related ketones by a reducing system consisting of NaBH4 and SnCl2 in THF in a common flask.
Synthesis of Optically Active Litsenolide C
Authors: Wakabayashi Shoji , Ogawa Hideki , Ueno Naomi , Kunieda Norio , Mandai Tadakatsu , Nokami Junzo
Published: July 2006

Lithium enolate, derived from alkyl 2-(phenylthio)alkanoate with lithium diisopropylamide, reacted with aldehyde in the presence of diethylaluminum chloride to give alkyl 2-phenylthio-2-alkyl-3-hydroxyalkanoate, which was converted to 2-alkylidene-3-hydroxy-alkanoate via thermolysis of the corresponding sulfoxide. The title compound was synthesized from methyl 2-(phenylthio)hexadecanoate and (R)-(+)-2-tert-butyldimethylsilyloxypropanal by employing the method.
Diacetonitrilebis(β-diketonato)ruthenium(II) Complexes. Their Preparation and Use as Intermediates for the Synthesis of Mixed-ligand β-Diketonato Ruthenium(III) Complexes
Authors: Kobayashi Tadashi , Nishina Yasuhiro , Shimizu Kunio , Satô Gen P
Published: July 2006

Diacetonitrilebis(β-diketonato)ruthenium(II) complexes were readily prepared by reducing the corresponding tris(β-diketonato)ruthenium(III) with zinc amalgam in an acetonitril–ethanol–water mixture. When a mixed-ligand β-diketonato complex [RuL2L′] is treated in this way, the more electron-donating ligand is preferentially displaced by two acetonitrile molecules. The diacetonitrile complexes are useful intermediates for the synthesis of mixed-ligand β-diketonato ruthenium( III) complexes of the type [RuL2L″].