bluuebunny/crossref_metadata_2025 huggingface dataset:
STRUCTURE AND ABSOLUTE CONFIGURATION OF (−)500CD-((2S,2′S)-1,1′-ETHYLENEDIPYRROLIDINE-2,2′-DICARBOXYLATO)(PIPECOLATO)COBALT(III)
Authors: Okamoto Ken-ichi , Okabayashi Minahiro , Ohmasa Masaaki , Einaga Hisahiko , Hidaka Jinsai
Published: July 2006

The absolute configuration of (−)500CD-((2S,2′S)-1,1′-ethylenedipyrrolidine-2,2′-dicarboxylato)(pipecolato)cobalt(III) was determined by X-ray diffraction study. This isomer has Δ-sym configuration and the asymmetric nitrogen and carbon atoms of the pipecolate ligand coordinated take R(N) and R(C) configurations, respectively.
CONVERSION OF 8-LANOSTEN-24-ONE INTO 8-LANOSTEN-23-ONE. 1,2-CARBONYL TRANSPOSITION ON THE LANOSTANE SIDE CHAIN
Authors: Namikawa Misuzu , Murae Tatsushi , Takahashi Takeyoshi
Published: July 2006

8-Lanosten-24-one was converted into 8-lanosten-23-one by carbonyl transposition via 23,23-dimethoxy-8-lanosten-24-one without degradation and reconstruction of the side chain. By the same procedure 29-nor-9(11)-lanosten-24-one was transformed into the corresponding 23-one.
3-NITRO-2-PYRIDINESULFENYL GROUP FOR PROTECTION AND ACTIVATION OF THE THIOL FUNCTION OF CYSTEINE
Authors: Matsueda Rei , Kimura Takahide , Kaiser Emil Thomas , Matsueda Gary R
Published: July 2006

The use of the 3-nitro-2-pyridinesulfenyl (Npys) halide, a versatile reagent in peptide chemistry, for the protection and activation of the thiol function is reported. Boc-Cys(Npys)–OH is prepared starting from bis(N-t-butyloxycarbonyl)-l-cystine. The Npys group is easily removed by treatment with a stoichiometric amount of tri-n-butylphosphine in the presence of water, but it is resistant to acids such as trifluoroacetic acid, HCl, and HF. Importantly, the cysteine residue modified with the Npys group can react selectively with free thiol of cysteine to afford a cystine disulfide bond.
SIMULTANEOUS DETERMINATION OF HYPOXANTHINE, XANTHINE AND URIC ACID USING AN IMMOBILIZED XANTHINE OXIDASE BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
Authors: Tawa Riichi , Kito Masahiro , Hirose Shingo
Published: July 2006

Immobilized xanthine oxidase was prepared by intermolecular cross-linking to porous aminopropyl-glass beads, and the properties were investigated in a batch process. Simultaneous analysis of hypoxanthine, xanthine and uric acid was achieved by using small column packed with the immobilized xanthine oxidase as a reactor for high-performance liquid chromatography (HPLC).
ENHANCED EFFECT OF SPRAY-DRIED POTASSIUM FLUORIDE ON FLUORINATION
Authors: Ishikawa Nobuo , Kitazume Tomoya , Yamazaki Takashi , Mochida Yoshiharu , Tatsuno Toshio
Published: July 2006

Spray-dried potassium fluoride was found to be much less hygroscopic and much more effective as a fluorinating agent than usual calcine-dried potassium fluoride. Organic compounds containing an activated halogen atom were readily fluorinated in acetonitrile with spray-dried potassium fluoride.
CARBOXYLATION OF γ-BUTYROLACTONES WITH CARBON MONOXIDE USING HF–SbF5 SUPER ACID
Authors: Yoneda Norihiko , Suzuki Akira , Takahashi Yukio
Published: July 2006

γ-Butyrolactones react with carbon monoxide at −20 to 30 °C and at atmospheric pressure in HF–SbF5 super acid media containing an excess of SbF5 to give dicarboxylic acids in good yields.
A NEW LABILE SESQUITERPENE DIOL HAVING BROMINE FROM THE MARINE RED ALGA, LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Furusaki Akio , Katayama Chuji , Kikuchi Hajime , Suzuki Teruaki
Published: July 2006

A new labile brominated sesquiterpene diol was isolated from the red alga, Laurencia nipponica Yamada (Rhodomelaceae, Rhodophyta, Urasozo in Japanese). The structure of this compound was determined by its spectral properties and X-ray diffraction analysis.
DOUBLE LIGAND-EXCHANGE REACTIONS BETWEEN THE PENTAAMMINEFLUOROCOBALT(III) ION AND THE DICARBOXYLATO COMPLEXES OF ALUMINIUM(III)
Authors: Iida Masayasu , Ando Mieko , Yamatera Hideo
Published: July 2006

Double ligand-exchange reactions such as CoF(NH3)52++AlAn3-2n→CoA(NH3)5++AlFAn-14-2n (A2−= oxalate ion or malonate ion) were found to proceed in about 90% yield under the conditions, [A2−]total>[Al3+]total>>[COF(NH3)52+].
HYDROXYLATION OF BENZENE WITH HYDROGEN PEROXIDE BY THE USE OF HYDROPHOBIC CATECHOLS AND Fe3+ COMPLEXES AS THE CATALYST
Authors: Hotta Kazuhiko , Tamagaki Seizo , Suzuki Yusuke , Tagaki Waichiro
Published: July 2006

Hydroxylation of benzene with H2O2 was carried out in the Presence of a variety of catechols and Fe3+ in a benzene–H2O biphase system. The hydrophobic catechols were found far more effective as the catalyst than the hydrophilic ones.
PHOTOCATALYTIC HYDROGEN PRODUCTION FROM WATER BY THE DECOMPOSITION OF POLY-VINYLCHLORIDE, PROTEIN, ALGAE, DEAD INSECTS, AND EXCREMENT
Authors: Kawai Tomoji , Sakata Tadayoshi
Published: July 2006

Xe-lamp irradiation of a platinized TiO2 photocatalyst in the presence of water and chlorine or nitrogen containing organic molecules, synthetic or natural, leads to the production of hydrogen at room temperature without the release of halogen or nitrogen compounds in the gas phase.
OBSERVATION OF THE CATIONS PRODUCED FROM CHLOROTHIOPHENES
Authors: Yokoyama Yukihiro , Yamashita Yukihide , Takahashi Kensuke , Sone Tyo
Published: July 2006

Well-resolved 1H NMR signals of the title cations were observed in HSO3F and AlCl3–HCl–CH2Cl2 systems. Chlorothiophenes are protonated exclusively at the positions adjacent to sulfur with or without substituents.
SYNTHESIS OF CHIRAL DEPSIPEPTIDE BUILDING BLOCK BY THE ASYMMETRIC REDUCTION OF N-(α-KETOACYL)-α-AMINO ESTERS
Authors: Ojima Iwao , Tanaka Toshiyuki , Kogure Tetsuo
Published: July 2006

Asymmetric reduction of N-(α-ketoacyl)-α-amino esters was performed by using homogeneous hydrosilylation and hydrogenation catalyzed by rhodium(I) complexes. The asymmetric hydrosilylation achieved good to high stereoselectivities giving the corresponding N-(α-hydroxyacyl)-α-amino esters, whereas only simple asymmetric induction arising from the chiral center of the substrate was observed in the case of hydrogenation.
REACTION OF NITRILE OXIDES WITH S,S-DIMETHYL-N-(2,4,6-TRIBROMOPHENYL) SULFIMIDE
Authors: Shigemoto Tadashi , Imamura Kiyoshi , Hayakawa Tohru , Ogawa Shojiro , Matsumoto Kazumasa , Shiraishi Shinsaku
Published: July 2006

2-Aryl-4,6-dibromobenzoxazoles were isolated in the reaction of benzonitrile oxides with S,S-dimethyl-N-(2,4,6-tribromophenyl)sulfimide. Structure determination was done by means of spectroscopic and elemental analyses.
PROTECTION OF ALCOHOLS AND ACIDS WITH ALLYLSILANES CATALYZED BY IODINE OR IODOTRIMETHYLSILANE IN CHLORINATED HYDROCARBON
Authors: Hosomi Akira , Sakurai Hideki
Published: July 2006

Many triorganosilyl ethers and esters were prepared by the reaction of allylsilanes with alcohols catalyzed by iodine or iodotrimethylsilane in excellent yields. Bromine and bromotrimethylsilane were also effective catalysts.
PALLADIUM CATALYZED REGIOSELECTIVE COTRIMERIZATION BETWEEN DIMETHYL ACETYLENEDICARBOXYLATE AND TWO 1-ALKENE MOLECULES
Authors: Itoh Kenji , Hirai Kenji , Sasaki Masaharu , Nakamura Yoshitaka , Nishiyama Hisao
Published: July 2006

In the presence of bis(maleic anhydride)(norbornene)palladium as a catalyst, two 1-alkene molecules, R–CH2–CH=CH2, were added regioselectively to dimethyl acetylenedicarboxylate in the syn addition mode to give dimethyl 2-(2-alkenyl)-3-alkylmaleates, R–CH=CH–CH2–C(COOCH3)=C(COOCH3)–CH2CH2CH2-R under moderate condition (40–45°C) in chloroform.
TWO NEARBY ELECTRONIC STATES OF PYRIDAZINE
Authors: Ueda Eiji , Udagawa Yasuo , Ito Mitsuo
Published: July 2006

Fluorescence excitation spectrum, SVL fluorescence spectra, MPI excitation spectrum in supersonic jet condition and absorption spectra in solvents at 4.2 K have been measured for the near UV transition of pyridazine. All support the interpretation that there exist two electronic states and their separation is 373 cm−1 in the gaseous state.
STEREOSELECTIVE TOTAL SYNTHESIS OF (±)-EREMOFORTIN B, A SESQUITERPENOID MYCOTOXIN OF Penicillium roquefovti
Authors: Yamakawa Koji , Mashiko Toshihisa , Satoh Tsuyoshi
Published: July 2006

The stereoselective total synthesis of (±)-eremofortin B (1), a sesquiterpenoid mycotoxin of Penicillium roqueforti, from 5β,6β-dimethyl-2,7-dioxo-Δ1(10)-octalin (2) is described. Stereochemistry of eremofortin B was confirmed as shown in 1.
OPTICAL RESOLUTION OF α-METHYLBENZYLAMINE AND 1-PHENYL-2-(p-TOLYL)ETHYLAMINE BY PREFERENTIAL CRYSTALLIZATION
Authors: Nohira Hiroyuki , Kai Mariko , Nohira Misako , Nishikawa Junji , Hoshiko Tomonori , Saigo Kazuhiko
Published: July 2006

(±)-α-Methylbenzylamine and 1-phenyl-2-(p-tolyl)ethylamine have been easily resolved into their optically active forms by preferential crystallization of their racemic salts with cinnamic acid.
A CRITICAL STUDY ON CIRCULAR DICHROISM MEASUREMENT IN LONGER SIDE OF VISIBLE REGION
Authors: Konno Toshio , Meguro Hiroshi , Murakami Tasuku , Hatano Masahiro
Published: July 2006

A test sample method revealed large instrumental deviations of molar ellipticities, [Θ], up to ±35% in circular dichroism(CD) in the 500-800 nm region, even after (+)-10-camphorsulfonic acid(CSA) calibration at 290 nm. Use of the nickel (II)tartrate solution and the tentative [Θ] values, −101.2 at 718 nm and −110.7 at 777 nm(degree dm3 · mol−1cm−1), were recommended to calibrate the wavelengths and magnitudes of the CD extrema in this region.
OXIDATIVE TRAPPING OF TRANSIENT THIAZOLIUM-ALDEHYDE ADDUCTS BY INTRAMOLECULAR FLAVIN. FLAVIN-THIAMINE BISCOENZYME MODEL
Authors: Shinkai Seiji , Yamashita Takaharu , Manabe Osamu
Published: July 2006

A biscoenzyme which has within a molecular structure both flavin and thiazolium ion was synthesized. In the presence of the biscoenzyme and hexadecyltrimethylammonium bromide (CTAB) micelle, aldehydes were efficiently converted to carboxylic acids and the acyloin condensation products were scarcely detected. Thus, the biscoenzyme serves as an interesting model system for pyruvate dehydrogenase.
EXCIMER OF CONFORMATIONALLY FLEXIBLE MOLECULES: DIETHYL p-PHENYLENEDIACRYLATE AND METHYL 4-(β-METHOXYCARBONYLVINYL)-α-CYANOCINNAMATE
Authors: Sakamoto Munenori , Huy Sam , Nakanishi Hachiro , Nakanishi Fusae , Yurugi Tadashi , Hasegawa Masaki
Published: July 2006

Conformationally flexible molecules of diethyl p-phenylenediacrylate (1) and methyl 4-(β-methoxycarbonylvinyl)-α-cyanocinnamate (2) exhibit excimer emission in concentrated solutions. The excimer of 1 is formed via excitation of the ground state aggregates of 1. In crystalline state, only 2, which has the crystal structure of B-type in Stevens’ classification, being different from the crystal structure (A-type) of 1, gives excimer emission. The stack-type structure is proposed for the excimers of 1 and 2.
RHODIUM CARBONYL-CATALYZED CARBONYLATION OF ACETYLENES IN ALCOHOL. SYNTHESIS OF 5-ALKOXY-2(5H)-FURANONES
Authors: Mise Takaya , Hong Pangbu , Yamazaki Hiroshi
Published: July 2006

Reactions of internal acetylenes with CO in alcohols gave 5-alkoxy-3,4-disubstituted-2(5H)-furanones in good yields in the presence of rhodium catalysts containing basic alkali metal salts, e.g., Rh4(CO)12 or RhCl3·3H2O in combination with sodium carbonate or sodium acetate.
PHOTOCHEMICAL REACTION OF EPOXYNAPHTHOQUINONE WITH AMINE. ITS DEPENDENCY ON SOLVENT STUDIED BY CIDNP TECHNIQUE
Authors: Maruyama Kazuhiro , Otsuki Tetsuo , Osuka Atsuhiro , Suzuki Hitomi
Published: July 2006

The oxirane ring of epoxynaphthoquinones was reductively opened upon irradiation in the presence of triethylamine and, in addition, a cross adduct was obtained in the reaction with N,N-dimethylaniline in benzene. CIDNP signals observed in the reaction with N,N-dimethylaniline were interpreted as evidence for hydrogen atom abstraction in benzene and for electron transfer in acetone and acetonitrile.
REVISED METHOD FOR CALCULATION OF GROUP ELECTRONEGATIVITIES
Authors: Inamoto Naoki , Masuda Shozo
Published: July 2006

Since Wilmshurst’s method for calculation of group electronegativity has some defects, the revised method was proposed for counting the number of valence electrons (n*) on the central atom A in radical −AB, and group electronegativities of more than 150 substituents were reasonably calculated.
A NEW REACTION OF AZIDOFORMATE WITH UNSATURATED ETHERS CATALYZED BY DICHLORO-BIS(BENZONITRILE)PALLADIUM
Authors: Migita Toshihiko , Saitoh Nobuhiro , Iizuka Hisao , Ogyu Chikataka , Kosugi Masanori , Nakaido Setsuko
Published: July 2006

In the presence of dichloro-bis(benzonitrile)palladium, azidoformate reacts with various unsaturated ethers to give 1-alkoxy-1-carboalkoxyiminoalkanes. Reaction with 1-methyl-2-propenyl ether was accompaied by methyl migration, giving 1-alkoxy-1-carboalkoxyimino-2-methylpropane.
REPARATION OF HOMOLEPTIC t-BUTYL ISOCYANIDE COMPLEX OF Mo(0) AND REACTIONS WITH ALKYL HALIDES. MOLECULAR STRUCTURE OF [Mo(t-BuN=CCH2Ph) (t-BuNC)5]Br
Authors: Yoshida Toshikatsu , Hirotsu Ken , Higuchi Taiichi , Otsuka Sei
Published: July 2006

Hexakis(t-butyl isocyanide)molybdenum(0) was prepared and reacted with alkyl halides to give η2-iminoacyl Mo(II) complexes. An X-ray structural study of the product, [Mo(t-BuN=CCH2Ph)(t-BuNC)5]Br revealed a distorted octahedral molecular structure, regarding the iminoacyl ligand as an unidentate ligand. An intensive bending (137°) of the t-butyl isocyanide trans to the η2-iminoacyl ligand was salient.
A NEW SYNTHETIC IONOPHORE EXHIBITING SELECTIVE Li+ TRANSPORT
Authors: Hiratani Kazuhisa
Published: July 2006

A noncyclic polyether, which contains 1,3-propylene oxide chain unit and both 8-quinolyl and o-carboxylphenyl terminal groups, exhibits highly selective transport of lithium ion for sodium and potassium ion species which are all together in aqueous solutions, against the concentration gradient through chloroform liquid membrane.
A SIMPLE ROUTE TO FURANS BY ORGANOALUMINUM REAGENTS
Authors: Ishiguro Masaharu , Ikeda Nobuo , Yamamoto Hisashi
Published: July 2006

2,3-Disubstituted furans are synthesized from the reaction of aldehydes with allenylaluminum reagents derived from propargylic ethers.
ISOLAURALLENE, A NEW NONTERPENOID C15-BROMOALLENE, FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Furusaki Akio , Suehiro Katsunao , Katayama Chuji , Suzuki Teruaki
Published: July 2006

Isolaurallene (1), a new nonterpenoid C15-bromoallene, was isolated from the red alga Laurencia nipponica Yamada. The structure of this compound was determined by its spectral properties and X-ray diffraction analysis.
RADIATION-INDUCED HYDROXYLATION OF THYMINE SENSITIZED BY NITRO COMPOUNDS IN N2O-SATURATED AQUEOUS SOLUTION
Authors: Wada Takeshi , Ide Hiroshi , Nishimoto Sei-ichi , Kagiya Tsutomu
Published: July 2006

Hydroxylation of thymine (1)to give thymine glycol (3) is remarkably promoted by the addition of nitro compounds (2a–f) in the γ-radiolysis of the N2O-saturated aqueous solution, although overall decomposition of 1 is depressed to some extent. The G-value of 3, increases linearly with increasing the one-electron reduction potential of 2a-f.
PHOTOCATALYTIC HYDROGEN EVOLUTION FROM WATER USING ZINC SULFIDE AND SACRIFICIAL ELECTRON DONORS
Authors: Yanagida Shozo , Azuma Takayuki , Sakurai Hiroshi
Published: July 2006

Irradiation(λ≥290 nm) of an aqueous suspension of ZnS prepared in situ from Na2S and ZnCl2 or ZnSO4 leads to the photocatalytic H2 evolution in the presence of sacrificial electron donors such as tetrahydrofuran, methanol, and ethanol.
CO-EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF BERBERINE WITH QUININE AND BROMOPHENOL BLUE
Authors: Sakai Tadao , Ohno Noriko
Published: July 2006

A sensitive and selective method for the determination of berberine is described. Though only a little berberine is extracted with bromophenol blue into chloroform at pH 6.7, it is extracted in quantity with the dye when quinine, being a bulky tertiary amine, co-exists in the aqueous solution. The blue associate is used for selective spectrophotometric determination of berberine in multi-component drugs.
CHARGE-TRANSFER COMPLEXATION WITH A NEW CLASS OF ELECTRON ACCEPTORS MADE OF TRIPTYCENEQUINONE UNIT
Authors: Lipczynska-Kochany Ewa , Iwamura Hiizu
Published: July 2006

The charge-transfer complex formation has been examined in CH2Cl2 solution with 9,10-(o-benzeno)anthracene-1,4,5,8-tetraone and 5,18: 7,16:9,14-tri-(o-benzeno)heptacene-1,4,6,8,10,13,15,17-octaone derivatives as electron acceptors. The high formation constants and the relevant thermodynamic parameters were obtained for the 1:2 quinone-TTF complexes.
PREPARATION OF ALKYL HALIDES VIA ORGANOTELLURIUMS
Authors: Chikamatsu Kiyofumi , Otsubo Tetsuo , Ogura Fumio , Yamaguchi Hachiro
Published: July 2006

The conversion of phenyltelluroalkanes to haloalkanes was studied in connection with the homologation of alkyl halides. Similar reactions of 1,1-bis(phenyltelluro)alkanes provided a new synthetic method of aldehydes.
STEREOSELECTIVE CARBONYL OLEFINATION VIA ORGANOSILICON COMPOUNDS. BORON AND TITANIUM REAGENTS
Authors: Haruta Ryuichi , Ishiguro Masaharu , Furuta Kyoji , Mori Atsunori , Ikeda Nobuo , Yamamoto Hisashi
Published: July 2006

Boron reagents derived from trialkylsilylacetonitrites are effective for the synthesis of Z-α,β-unsaturated nitriles. Z-Terminal enyne units are synthesized from the titanium reagent from 1,3-bis-(trimethylsilyl)propyne and aldehydes.
EFFECTS OF SUPPORTS AND PREPARATION METHODS OF HETEROGENIZED FeCl3 CATALYSTS IN THE OXIDATION OF 3,5-DI-TERT-BUTYLCATECHOL IN APROTIC SOLVENTS
Authors: Funabiki Takuzo , Sugimoto Tsunemi , Yoshida Satohiro
Published: July 2006

FeCl3-catalyzed oxidation of 3,5-di-t-butylcatechol (DTBC) to 3,5-di-t-butyl-o-benzoquinone (DTBQ) by molecular oxygen in tetrahydrofuran (THF) was significantly promoted by addition of SiO2, γ-Al2O3, and active carbon in situ. Activity of catalysts prepared by an impregnation method in water or THF was greatly dependent on the supports and solvents used for preparation of the catalysts.
EXAFS STUDY OF HIGHLY ACTIVE Mo2 CATALYST
Authors: Sato Yoshiharu , Iwasawa Yasuhiro , Kuroda Haruo
Published: July 2006

Mo K absorption spectrum was measured on the fixed Mo2 catalyst which has been supposed to have a well-defined “paired”structure according to its preparation procedures and from the results by UV diffuse reflectance, IR, ESR, XPS and chemical analysis. The analysis of EXAFS data provides a direct structural information that strongly supports the proposed paired structure of this catalyst.
PENTACHLOROTROPOLONE AND 3-HYDROXYPENTACHLOROTROPONE
Authors: Kusuda Kousuke , Hara Nobuya , West Robert
Published: July 2006

Pentachlorotropolone(3) was obtained by treatment of octachlorocycloheptatriene(1) with concentrated sulfuric acid. Chlorination of 3 in liquid chlorine afforded a perchlorinated seven-membered reductone(12). Photolysis of 4-hydroxypentachlorobicyclo [3.2.0]hepta-3,6-dien-2-one(18) gave 3-hydroxypentachlorotropone(19).
PHOTO-INDUCED HYDROXIDE ADDITION TO NITROSYL GROUP OF BIS(2,2′-BIPYRIDINE)CHLORONITROSYLRUTHENIUM(2+) IN AQUEOUS SOLUTION
Authors: Sugimori Akira , Uchida Hiroto , Akiyama Takeo , Mukaida Masao , Shimizu Kunio
Published: July 2006

The irradiation of [RuCl(bpy)2NO]2+ in an aqueous solution at pH ≈ 5 with UV- or solar light brings about the addition of hydroxide to a coordinating NO to give metastable [RuCl(bpy)2NO2H]+, which returns to [RuCl(bpy)2NO]2+ in the dark. The reaction produces a reversible change of H+ concentration. The quantum yields for the formation of [RuCl(bpy)2NO2H]+ at 254, 289, 313, and 334 nm are 0.04, 0.04, 0.04, and 0.05, respectively.
THE ACTIVE SITE OF ETHYLENE POLYMERIZATION ON MoY ZEOLITE DERIVED FROM Mo(CO)6/HY
Authors: Namba Seitaro , Komatsu Takayuki , Yashima Tatsuaki
Published: July 2006

The catalytic activity of MoY zeolite for ethylene polymerization and the apparent oxidation number of molybdenum changed with the activation temperature of HY zeolite and the decomposition temperature of Mo(CO)6/HY. At 573K of the decomposition temperature, the maximum activity was observed when the apparent oxidation number was about 1.
AZETIDINE-2,4-DIONES VIA PHOTOCHEMICAL REACTION OF N-FORMYL-α-OXOAMIDES
Authors: Aoyama Hiromu , Sakamoto Masami , Omote Yoshimori
Published: July 2006

Photochemical reaction of N-formyl-α-oxoamides gave 3-hydroxyazetidine-2,4-diones in good yields. In the case of N-benzyl-N-formylamide, N-formyl-β-lactam was obtained accompanied by the azetidine-2,4-dione. Intramolecular hydrogen abstraction mechanisms were postulated.
STRUCTURE OF DIMORACIN, A NEW NATURAL DIELS–ALDER ADDUCT FROM DISEASED MULBERRY
Authors: Takasugi Mitsuo , Nagao Shigemitsu , Masamune Tadashi
Published: July 2006

The structure of a new phytoalexin, isolated from diseased mulberry shoots and designated as dimoracin, is described. The compound is regarded biogenetically as a Diels–Alder adduct of moracin C, a 2-phenylbenzofuran phytoalexin isolated from the same tissues, and its dehydro derivative.
ALBAFURANS A AND B, GERANYL 2-PHENYLBENZOFURANS FROM MULBERRY
Authors: Takasugi Mitsuo , Ishikawa Shin-ichi , Masamune Tadashi
Published: July 2006

The structure elucidation of two minor antifungal compounds, isolated from “intact” epidermis of mulberry shoots and designated as albafurans A and B, is described.
A LINEAR RELATIONSHIP BETWEEN 13CNMR CHEMICAL SHIFT OF VINYL CARBONS AND ELECTRONIC ABSORPTION WAVELENGTH IN POLYSILYLETHYLENES
Authors: Sakurai Hideki , Tobita Hiromi , Nakadaira Yasuhiro
Published: July 2006

A very good linear correlation between 13CNMR chemical shift of vinyl carbons and electronic absorption maxima (band II) of polysilylethylenes has been established. An explanation based on the theory of Karplus–Pople is presented.
A FACILE SYNTHESIS OF α,α,γ-TRICHLOROALKANOIC ACIDS VIA THE Ru(II)-CATALYZED ADDITION OF TRICHLOROACETYL CHLORIDE TO OLEFINS
Authors: Nakano Taichi , Shimada Yasuyo , Sako Ryosuke , Kayama Mikio , Matsumoto Hideyuki , Nagai Yoichiro
Published: July 2006

α,α,γ-Trichloroalkanoic acids were prepared with great ease by the dichlorotris(triphenylphosphine)ruthenium(II)-catalyzed addition of trichloroacetyl chloride to olefinic compounds followed by hydrolysis of the resulting 1:1 adducts, α,α,γ-trichloro-substituted acid chlorides.
NOVEL TRANSETHERIFICATION IN CATALYTIC REDUCTION OF 4-ALKOXYNITROBENZENES IN ALCOHOL-SULFURIC ACID SOLUTION
Authors: Sone Takaaki , Teraoka Tadayoshi , Katada Sho-ji , Ohkubo Makoto , Karikura Masami , Shinkai Seiji , Manabe Osamu
Published: July 2006

In catalytic reduction (5% Pt–C, 1 atm H2) of 4-alkoxynitrobenzenes (R1O–C6H4–NO2) in alcohol(R2 OH)-sulfuric acid solution at room temperature, the reduction was found to be accompanied by transetherification to afford R2O–C6H4–NH2.
A NEW SYNTHETIC METHOD OF α,β-UNSATURATED KETONES VIA REGIOSELECTIVE REACTION OF ALLYL ANION FORMED FROM 2-MORPHOLINO-3-BUTENENITRILES (MASKED ACYL ANION EQUIVALENTS) WITH ALKYL HALIDES FOLLOWED BY HYDROLYSIS
Authors: Takahashi Kazumasa , Honma Akira , Ogura Katsuyuki , Iida Hirotada
Published: July 2006

Treatment of 2-morpholino-3-butenenitriles and alkyl halides regioselectively afforded products alkylated on α-position to the nitrile group. The hydrolysis of the α-alkylation products gave the α,β-unsaturated ketones in good yields.
FORMATION OF MONOLAYER AND BILAYER MEMBRANES FROM AMPHIPHILIC ANTHRACENE DERIVATIVES. PECULIAR SPECTROSCOPIC BEHAVIOR AND CHROMOPHORE ORIENTATION
Authors: Shimomura Masatsugu , Hashimoto Hiromasa , Kunitake Toyoki
Published: July 2006

Monolayer and bilayer membranes of anthracene-containing amphiphiles show highly contrasting behaviors in absorption and emission spectroscopies and in energy transfer from biphenyl donors. These peculiarities are ascribed to different chromophore orientations.
A QUANTITATIVE ESR STUDY OF Mo5+ FORMED ON DODECAMOLYBDOPHOSPHORIC ACID
Authors: Eguchi Koichi , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

The esr signal of Mo5+ on reduced 12-molybdophosphoric acid was found to be significantly affected by the degree of hydration, the degree of reduction (DR) and recording temperature. The spin concentrations of samples with low DR ( < 1 e/anion) could quantitatively be measured when the relaxation time of Mo5+ was made sufficiently large by sample evacuation at 300°C followed by recording at −100°C. For samples with DR > 1 e/anion the dilution of reduced anions with unreduced ones was effective. It was suggested that the interaction between Mo5+ ions within a polyanion remains weak even when 4 Mo5+ are produced in a polyanion.
PROMOTION EFFECT OF IRON FOR THE MULTICOMPONENT BISMUTH MOLYBDATE CATALYSTS AS REVEALED BY 18O2 TRACER
Authors: Ueda Wataru , Moro-Oka Yoshihiko , Ikawa Tsuneo , Matsuura Ikuya
Published: July 2006

Promotion effect of trivalent metal ions in tetra-component bismuth molybdate catalysts, Mo10Bi1Co8M3III Ox was investigated using 18O2 tracer in the selective oxidation of propylene to acrolein. MIII, especially Fe3+, introduces cation vacancies into CoMoO4 in the form of Co1−3x2+M2xIIIφxMoO4 which accelerate the bulk diffusion of the lattice oxide ions to increase the catalytic activity of the multicomponent systems.
POLYMERIZATION OF METHYL METHACRYLATE IN THE WATER-DIOXANE SYSTEM CONTAINING PEROXIDE AND WATER-SOLUBLE POLYMER
Authors: Nonaka Takamasa , Nishida Haruo , Tagawa Rikiichi , Egawa Hiroaki
Published: July 2006

The polymerization of methyl methacrylate in the water-dioxane system containing peroxide and water-soluble polymer(PST) with amino groups was investigated. It was found that the polymerization proceeds smoothly at 60°C in the presence of both hydroperoxide and PST. The generation of radicals from the interaction between hydroperoxide and PST was observed by the ESR spectrum using spin trapping method.
SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF POLYOXA(n)FERROCENOPHANES
Authors: Akabori Sadatoshi , Fukuda Hiroshi , Habata Yoichi , Sato Masaru , Ebine Seiji
Published: July 2006

Three mononuclear polyoxa(n)ferrocenophanes (5) and binuclear polyoxa(n,n)ferrocenophanes (6) derived from 1,1′-bis(hydroxymethyl)ferrocene were synthesized and complexing ability of 5 with alkali and transition metal cations was measured by a solvent extraction method. Their complexing abilities were excellent with silver cation, although polyoxa(n)ferrocenophanes (1) derived from 1,1′-dihydroxyferrocene were decomposed by oxidation.
RADIOACTIVE IMPLANT INDUCED X-RAY EMISSION SPECTROMETRY BY THE USE OF 67Ga, 99mTc, 111In AND 201Tl
Authors: Amano Ryohei
Published: July 2006

Induced X-ray emission spectrometry was examined by mixing a sample in solution with a radioisotope, which was used as a X-ray excitation source. The radioisotopes used were 67Ga, 99mTc, 111In and 201Tl. The copper, strontium, iodine, barium, lead and uranium solutions were used as the sample to be analyzed. The effective excitation efficiencies for each radioisotope were obtained.
HYDROPHILIC POLYMERS CONTAINING MEROCYANINE DYES AS PENDANT GROUPS: THE SWOLLEN THIN FILM AS SPECTRAL SENSITIZER FOR SEMICONDUCTOR PHOTOELECTRODES
Authors: Morishima Yotaro , Isono Masanao , Nozakura Shun-ichi
Published: July 2006

Hydrophilic polymers, such as polyethylenimine and poly(vinyl alcohol), containing merocyanine as grafted pendants were deposited on SnO2 optically transparent electrode by spin coating technique. Under illumination of visible light, the electrode showed remarkable sensitized photocurrent in an electrochemical photocell. With a thin polymer-dye film, an intrinsic current quantum efficiency of 0.6 was obtained. It is evidenced that the polymer-dye film should be swollen with electrolyte to yield photocurrent.
PICOSECOND PULSE RADIOLYSIS OF FLUOROTRICHLOROMETHANE AND BROMOTRICHLOROMETHANE
Authors: Sumiyoshi Takashi , Tsugaru Kazunori , Katayama Meiseki
Published: July 2006

Transient species in the radiolysis of CFCl3 and CBrCl3 was studied by stroboscopic picosecond pulse radiolysis. Two principal bands in the UV and Vis region were observed in both samples and identified as cations and charge transfer complexes of parent cations and halogen anions respectively.
FORMATION OF THE IMIDAZOLATE-BRIDGED BINUCLEAR COPPER(II) COMPLEXES IN AQUEOUS SOLUTION AS STUDIED BY ESR
Authors: Yokoi Hiroshi , Chikira Makoto
Published: July 2006

It has been revealed by ESR spectroscopy that, when imidazole is added to the aqueous solutions of the 1:1 complexes of copper(II) with familiar tridentate ligands or aminocarboxylates by half the molarity of the complexes, imidazolate-bridged binuclear copper(II) complexes are formed almost stoichiometrically at pH \gtrsim 9. Spin exchange interactions in the imidazolate-bridged complexes are sensitively and subtly dependent on environmental and structural factors.
CHARGE SEPARATION ON MICELLE SURFACE WHICH INITIATES RADICAL POLYMERIZATION. EVIDENCE FOR THE MULTI-STEP HYDROGEN TRANSFER FROM NADH MODELS TO PEROXIDES
Authors: Shinkai Seiji , Tsuno Takaharu , Asatani Yukiko , Manabe Osamu
Published: July 2006

Radical polymerization of acrylamide was initiated in the presence of sodium dodecylsulfate, 1-hexadecyl-1,4-dihydronicotinamide, and potassium persulfate. The result supports that the hydrogen transfer from a NADH model compound to peroxides proceeds through the multi-step mechanism.
COAL HYDROLIQUEFACTION USING IRON PENTACARBONYL AS A CATALYST PRECURSOR
Authors: Suzuki Toshimitsu , Yamada Osamu , Fujita Katsuhisa , Takegami Yoshinobu , Watanabe Yoshihisa
Published: July 2006

Coal hydroliquefaction using iron pentacarbonyl as a catalyst precursor was studied. The iron catalyst was found to be effective for coal liquefaction, resulting in increases in coal conversion and lighter fractions of coal derived materials.
109Ag NMR SPECTRA OF AQUEOUS SILVER IONS COORDINATED WITH NITROXIDE RADICAL. SILVER–TANOL COMPLEX AND TANOL AS A DOPING AGENT
Authors: Endo Kazunaka , Matsushita Kazuhiro , Deguchi Kenzo , Yamamoto Kyonosuke , Suzuki Shigeyoshi , Futaki Kiyoshi
Published: July 2006

The effects of TANOL radical have been examined on chemical shifts and relaxation rates of 109Ag nmr in aqueous solution of silver salts. The silver ion in aqueous solution is found to coordinate with TANOL radical. A small amount of TANOL is added as a doping agent(0.020M), since 109Ag signals are obtained for (1.0M) silver ion within 30 minutes. The 109Ag chemical shifts of silver salt in aqueous solutions were found within the range of 0 to −1000 ppm relative to that of 1.0M AgN3.
A CHARGE-TRANSFER COMPLEX AS AN INTERMEDIATE IN THE REDUCTION OF CHLORANIL BY A NADH MODEL COMPOUND
Authors: Fukuzumi Shunichi , Tanaka Toshio
Published: July 2006

A 1:1 charge-transfer (CT) complex between 1-benzyl-1,4-dihydronicotinamide (BzlNH) and chloranil was isolated from a benzene solution of these reactants (hνCT =1.70 eV, λmax = 730 nm). The transient CT band was observed also in the hydride transfer from BzlNH to chloranil in MeCN. The decay of the CT band coincided with the formation of the product, tetrachlorohydroquinone anion.
SYNTHESIS AND REACTIVITY OF TRIFLUOROMETHYLAZOSULFONYLARENES
Authors: Sekiya Akira , Umemoto Teruo
Published: July 2006

Trifluoromethylazosulfonylarenes were synthesized in high yields by treatment of trifluoronitrosomethane with arenesulfonamides in the presence of a base and their reactivity was examined. It was found that they acted as effective hydrogen-acceptors as well as trifluoromethylating agents.
A CONVENIENT METHOD FOR THE SYNTHESIS OF 7-OXO-(E)-3-ALKENOIC ACIDS BY THE REACTION OF β-VINYL-β-PROPIOLACTONE WITH METALLATED N,N-DIMETHYLHYDRAZONES
Authors: Fujisawa Tamotsu , Takeuchi Masashi , Sato Toshio
Published: July 2006

β-Vinyl-β-propiolactone reacts regio- and stereoselectively with an enolate equivalent such as cuprate derivatives of N,N-dimethylhydrazones and their bromomagnesium derivatives in the presence of a copper(I) catalyst to afford 7-oxo-(E)-3-alkenoic acids in high yields.
HIGHLY STEREOSELECTIVE SYNTHESIS OF α-d-GLUCOPYRANOSIDES BY THE N-IODOSUCCINIMIDE-PROMOTED INTERNAL CYCLIZATION
Authors: Suzuki Keisuke , Mukaiyama Teruaki
Published: July 2006

Highly stereoselective cyclizations of hydroxy enol ethers are effected by N-iodosuccinimide to result in the exclusive formation of 2′-deoxy-2′-iodo-α-d-glucopyranosides. An analog of glycolipid is also successfully synthesized according to the present method.
MEMBRANE SEPARATION AND CONCENTRATION OF COPPER ION BY AN ION PUMP DRIVEN BY LIGHT
Authors: Ohki Akira , Takeda Tadashi , Takagi Makoto , Ueno Keihei
Published: July 2006

A novel device for copper separation and concentration is presented in which light energy was used as driving potential. This was achieved by combining a photo-induced redox reaction to a redox potential-driven, carrier-mediated transport of copper ion through a polymer-supported liquid membrane.
PERISELECTIVE CYCLOADDITION REACTION OF 3-PHENYLTHIAIV ZOLO[4,3-a]ISOINDOLE TO ELECTRON-DEFICIENT OLEFIN
Authors: Kanemasa Shuji , Ikeda Shigehiko , Shimoharada Hiroshi , Kajicaeshi Shoji
Published: July 2006

3-PhenylthiaIV zolo[4,3-a]isoindole, generated in situ from 3-phenyl-5H-thiazolo[4,3-a]isoindolium bromide and triethylamine, reacted with a variety of electron-deficient olefins yielding the regio- and stereoselective 1:1 adducts between the azomethine ylide 1,3-dipole of the isoindole and the olefins.
HIGH ACTIVITY OF MoO3–SnO2 FOR HYDROCRACKING OF DIPHENYL ETHER AND DIPHENYLMETHANE
Authors: Stenberg Virgil I , Srinivas V R , Tanabe Kozo , Jin Tuo , Hattori Hideshi
Published: July 2006

Of four newly synthesized catalysts designed for coal liquefaction, MoO3–SnO2 was superior for use with diphenyl ether and diphenylmethane with either H2 or CO + H2O. This agrees with the results of using these catalysts with a sub-bituminous coal. Carbon monoxide and H2O is superior to H2 for ether cleavage, whereas H2 is better for hydrocarbon cleavage.
PHOTOCHEMICAL REACTION OF 2-AROYL- 3-ARYLNORBORNADIENES
Authors: Toda Takashi , Hasegawa Eietsu , Mukai Toshio , Tsuruta Haruki , Hagiwara Toshimitsu , Yoshida Toshio
Published: July 2006

Irradiation of 2-aroyl-3-arylnorbornadiene derivatives (1) afforded the corresponding quadricyclane derivatives (2) in good chemical yields and with excellent efficiencies (Φ=0.3–0.6). The quadricyclanes were converted to the original norbornadienes by treatment with trifluoroacetic acid, silver perchlorate, and silica gel, or by heating.
A NEW METHOD FOR THE SYNTHESIS OF α-l-THREOFURANOSIDES FROM ACYCLIC PRECURSOR
Authors: Mukaiyama Teruaki , Sugaya Toru , Marui Shogo , Nakatsuka Takashi
Published: July 2006

Stereoselective alkoxylation of acyclic precursor, (2S,3S)-2,3-O-isopropylidene-4-chloro-4-phenylthiobutyric acid methyl ester (3) in the presence of SnCl2–AgClO4, followed by Pd(OAc)2 promoted cyclization gave α-l-threofuranosides in good yields.
FACILE SYNTHESIS OF β-KETOESTERS BY A COUPLING REACTION OF THE REFORMATSKY REAGENT WITH ACYL CHLORIDES CATALYZED BY A PALLADIUM COMPLEX
Authors: Sato Toshio , Itoh Toshiyuki , Fujisawa Tamotsu
Published: July 2006

β-Ketoesters were obtained in good yields by the reaction of the Reformatsky reagent with acyl chlorides catalyzed by a palladium complex under mild conditions.
PARTICIPATION BY THE NEIGHBORING FUNCTIONAL GROUP IN THE EPOXIDATION REACTION
Authors: David Feeya , Nunes Bárbara Jardim
Published: July 2006

Reactions of m-chloroperbenzoic acid with the medium ring olefins possessing the neighboring hydroxymethyl or carboxyl functional group afforded a simple synthetic route to bicyclic ethers or lactones.
THE SYNTHESES OF HEXACARBONYL (TROPONE) DIIRON AND SEVERAL TRICARBONYLIRON COMPLEXES OF HEPTAFULVALENE
Authors: Morita Noboru , Asao Toyonobu
Published: July 2006

A new hexacarbonyl(tropone)diiron complex was isolated and characterized. Several carbonyliron complexes of heptafulvalene were also synthesized.
PHOTOREDUCTION OF ALKYL HALIDES BY AN NADH MODEL. EVIDENCE FOR ONE-ELECTRON TRANSFER MECHANISM
Authors: Fukuzumi Shunichi , Hironaka Katsuhiko , Tanaka Toshio
Published: July 2006

A model of NADH, 1-benzyl-1,4-dihydronicotinamide (BzlNH), reduces benzyl bromide and methyl iodide in the presence of pyridine in MeCN under irradiation of the visible light (λ > 360 nm), yielding toluene and methane as main products, respectively. Evidence is presented for occurrence of one-electron transfer from the excited state of BzlNH to benzyl bromide or methyl iodide in the primary process of the photoreduction.
ELECTRON TRANSFER REACTIONS OF AN NADH MODEL WITH IRON(III) COMPLEXES. A TWO-STEP ELECTRON TRANSFER MECHANISM
Authors: Fukuzumi Shunichi , Kondo Yuji , Tanaka Toshio
Published: July 2006

A model of NADH, 1-benzyl-1,4-dihydronicotinamide (BzlNH), readily reduces [Fe(N–N)3]3+ (N–N = 2,2′-bipyridine and 1,10-phenanthroline) to [Fe(N–N)3]2+. The stoichiometry of the electron transfer reaction in the absence of a suitable base is such that BzlNH appears to be one-electron donor. In the presence of pyridine or p-cyanopyridine, however, BzlNH acts as an apparent two-electron donor, when the reduction of [Fe(N–N)3]3+ with BzlNH proceeds by a two-step process.
THE ENANTIOSELECTIVE BIOTRANSFORMATION OF α-TERPINEOL AND ITS ACETATE WITH THE CULTURED CELLS OF NICOTIANA TABACUM
Authors: Suga Takayuki , Hirata Toshifumi , Lee Ym Sook
Published: July 2006

In the biotransformation of the enantiomers of p-menth-1-en-8-ol (α-terpineol) and 8-acetoxy-p-menth-1-ene (α-terpinyl acetate) with the cultured suspension cells of Nicotiana tabacum, it was clarified that the cultured cells effected the hydroxylation at the 6-position of (4R)-(+)-enantiomer in preference to the (4S)-(−)-enantiomer, whereas the cells did the hydrolysis of the acetoxyl group and the hydroxylation of the ethylenic linkage of (4S)-(−)-α-terpinyl acetate in preference to the (4R)-(+)-enantiomer.
TAST POLAROGRAPHY OF OXOBIS(2,4-PENTANEDIONATO)VANADIUM(IV) IN AQUEOUS SOLUTIONS BY USING RAPIDLY DISLODGED MERCURY ELECTRODE
Authors: Tanaka Nobuyuki , Kato Yoshikiyo , Suzuki Shigeru , Yamada Akifumi
Published: July 2006

The tast polarography of [VO(acac)2] in aqueous solutions has been studied. Two well-defined separate waves of equal heights were obtained at a drop time of 0.5 s and a complex concentration of 0.23 mmol dm−3. The ill-defined polarograms of [VO(acac)2] in aqueous solutions were interpreted by the adsorption of some vanadium species produced by electrolysis at the surface of electrode.
NOVEL CARBON–CARBON BOND CLEAVAGE REACTIONS OF α-AZOHYDROPEROXIDES
Authors: Utaka Masanori , Fujita Yuji , Takeda Akira
Published: July 2006

1-Phenylazo-l-hydroperoxycyclohexanes, easily prepared by the autoxidation of cyclohexanone phenyl hydrazones, have been found to undergo C(1)–C(2) bond cleavages when treated with acids, bases, or reducing reagents under mild conditions. Thus 6-oxoalkanoic acids and their derivatives have been obtained in good yields from 2-hydroxycyclohexanone derivatives. The 2-hydroxyl group seems to play an important role for the cleavage.
DEOXYBENZOINS FROM AROMATIC ALDEHYDES
Authors: Yofkoyama Masataka , Hoshi Kazuko , Imamoto Tsuneo
Published: July 2006

Aromatic aldehydes were easily converted into the corresponding deoxybenzoins by treatment with methyl thiocyanate in the presence of tributylphosphine, followed by addition of sodium hydride.
DESULFURIZATION OF 2-THIOURIDINES BY DIPOTASSIUM DIAZENEDICARBOXYLATE
Authors: Ogihara Takuo , Mitsunobu Oyo
Published: July 2006

The reaction of 5-methoxycarbonylmethyl-2-thiouridine (la) with dipotassium diazenedicarboxylate and with N2H4–H2O2 afforded l-(β-d-ribofuranosyl)-5-methoxycarbonylmethyl-4-(lH)-pyrimidinone (3a) in good yields, suggesting that the reaction involves diimide. On treatment with H2O2, la also gave 3a.
STRUCTURAL AND ABSOLUTE CONFIGURATIONAL STUDIES OF STRIATENE, STRIATOL AND (β-MONOCYCLONEROLIDOL, THREE SESQUITERPENOIDS FROM THE LIVERWORT PTYCHANTHUS STRIATUS (LEHM. ET LINDEMB.) NEES
Authors: Takeda Reiji , Mori Reiko , Hirose Yoshio
Published: July 2006

Three new sesquiterpenoids, striatene, striatol and β-monocyclonerolidol, were isolated from the liverwort Ptychanthus striatus(Lehm. et Lindemb.) Nees. Their structures have been established by spectroscopic analysis and chemical transformation.

These compounds are interesting in terms of the evolution of the liverwort from algae.
DISTRIBUTION OF MANGANESE IN MANGANESE FERRITE PARTICLES PREPARED BY AIR OXIDATION OF HYDROXIDE SUSPENSIONS
Authors: Utsunomiya Taizo , Hoshino Yoshio
Published: July 2006

The distribution of manganese in manganese ferrite particles prepared by the air oxidation of coprecipitated hydroxide suspensions has been investigated from the dissolution curves by using the core-model. The mole fraction of manganese increases gradually from the center to the surface of the particles and also increases abruptly near the particle surface.
THE REACTION OF BENZYLAMINES WITH TRIALKYLALUMINUMS UNDER IRRADIATION
Authors: Omura Kanji , Furukawa Junji
Published: July 2006

Irradiation of benzylamines (PhCH2NR′R″) complexed with trialkylaluminums (R3Al) in benzene gives alkylbenzenes (PhCH3 and PhCH2R) and amines (HNR′R″). 1,2-Diphenylethane is also obtained as a side-product.
A NEW AND EFFECTIVE ASYMMETRIC SYNTHESIS OF 3-PHENYLALKANALS
Authors: Mukaiyama Teruaki , Hayashi Hiroki , Miwa Tetsuo , Narasaka Koichi
Published: July 2006

Highly optically active 3-phenylalkanals were obtained by the reaction of alkyl halides and a chiral homoenolate equivalent derived from the cinnamyl ether 3 and potassium diisopropylamide, followed by acidic hydrolysis.
THE COMPETITION BETWEEN INTER- AND INTRAMOLECULAR ELECTRON-TRANSFER PROCESS INVOLVING POLYPYRIDINERUTHENIUM(II) COMPLEXES WITH LINKED VIO-LOGEN UNITS IN SURFACTANT-TYPE VIOLOGEN ASSEMBLIES
Authors: Sakura Katsuhiko , Sakamoto Tetsuo , Matsuo Taku
Published: July 2006

Polypyridineruthenium(II) complex with linked viologen units was synthesized as the model of man-made photoreaction center. Luminescence quenching of the ruthenium complex by a surfactant-type viologen in micellar or bilayer membrane systems was resolved into inter- and intramolecular processes and it became apparent that the photoinduced charge separation in intramolecular process was more efficient than that in intermolecular process.
CATALYTIC ACTIVITY OF HEAT-TREATED Co(II)-TETRAPHENYLPORPHYRIN FOR CATHODIC REDUCTION OF OXYGEN
Authors: Okabayashi Katsuaki , Ikeda Osamu , Tamura Hideo
Published: July 2006

Heat treatment effect of Co(II)-tetraphenylporphyrin (Co-TPP) on the catalytic activity for cathodic reduction of oxygen was studied. The improved catalytic activity of Co-TPP heat-treated at temperatures between 500 and 700°C was found to be due to a remarkable increase in the conductivity and the variation of the electronic states of the central metal ion, resulting from an extension of π-electron system by polymerization.
UNUSUAL REGIOSELECTIVE HYDROSILYLATION OF ETHYNYLMETHYLDICHLOROSILANE WITH DIMETHYLCHLOROSILANE CATALYZED BY TETRAKIS(TRIPHENYLPHOSPHINE)PLATINUM(0)
Authors: Matsumoto Hideyuki , Hoshino Yoshikazu , Nagai Yoichiro
Published: July 2006

The hydrosilylation of ethynylmethyldichlorosilane with dimethylchlorosilane catalyzed by tetrakis(triphenylphosphine)platinum(0) was found to show quite an unusual regioselectivity to afford the geminal product, 1-(methyldichlorosilyl)-1-(dimethylchlorosilyl)ethene, almost exclusively.
PHOTOCATALYTIC ISOMERIZATION OF BUTENES OVER TiO2 AND ZnO
Authors: Kodama Sukeya , Yabuta Masaaki , Kubokawa Yutaka
Published: July 2006

Photocatalytic isomerization of butenes over ZnO and TiO2 has been investigated. With ZnO, 1-butene is more reactive than 2-butene, photoenhancement in the isomerization being attributable to photoformed O− hole centers. With TiO2, 2-butene is more reactive than 1-butene, which would result from a stronger interaction of the C=C bond of 2-butene with UV irradiated TiO2.
PHOTOCHEMICAL REACTIONS OF PYRIMIDIN-2(1H)-ONES: INTER- AND INTRAMOLECULAR HYDROGEN ABSTRACTION BY THE NITROGEN OF IMINO GROUP
Authors: Nishio Takehiko , Katahira Katsuhiro , Omote Yoshimori
Published: July 2006

Irradiation of 1-methyl-4,6-diphenylpyrimidin-2(1H)-one (1a) in acyclic or cyclic ethers afforded the C–C bonded 1:1-adducts (2a–c) of 1a and ether via intermolecular hydrogen abstraction of the excited imino nitrogen of 1a, while irradiation of 1-phenyl-4-(3-ethoxypropyl)-6-methylpyrimidin-2 (1H)-one (1g) gave 1-phenyl-4,6-dimethylpyrimidin-2(1H)-one (1d) via intramolecular hydrogen abstraction of the excited imino nitrogen of 1g, in addition to 2-oxo-l,3-diazabicyclo[2.2.0]hex-5-ene derivative (3g).
POLYSTYRENE-SUPPORTED ALUMINIUM COPPER CHLORIDE AS WATER-RESISTANT SOLID CARBON MONOXIDE ADSORBENT
Authors: Hirai Hidefumi , Hara Susumu , Komiyama Makoto
Published: July 2006

A solid adsorbent of carbon monoxide, polystyrene-supported aluminium copper(I) chloride, is prepared by use of carbon disulfide as solvent. The adsorbing activity of the resulting adsorbent shows no measurable decrease after the repeated contact with nitrogen gas containing a considerable amount of water.
AN EFFICIENT SYNTHESIS OF JOLKINOLIDE E INVOLVING THE BUTENOLIDE RING FORMATION BY INTRAMOLECULAR WITTIG REACTION
Authors: Katsumura Shigeo , Isoe Sachihiko
Published: July 2006

A synthesis of jolkinolide E from the bicyclic enone 3 using intramolecular Wittig reaction is described. In this synthesis a facile esterification method by means of a mixed anhydride of trichloroacetic acid catalyzed by DMAP, which culminates in the effective synthesis of the α,β,γ-trisubstituted butenolide ring, is also described.
ACTIVE METAL/OXIDE SYSTEMS FOR WATER DECOMPOSITION
Authors: Igarashi Akira , Asano Hiromichi , Kikuchi Yoshihiro , Ogino Yoshisada
Published: July 2006

Several Metal/WO3 systems (Metal = Re, Ir, Rh, Ru, Os, Pd, Pt) exhibit high hydrogen evolution activities when contacted with water vapor at 480°C. The use of WO3 along with a metal species is necessary to bring about the high activity. X-Ray diffraction data of Rh/W3O systems strongly suggest that W3O species formed by activation (reduction by H2) is responsible for the unique property of WO3.
A WATER-SOLUBLE SOLAR ENERGY STORAGE SYSTEM
Authors: Maruyama Kazuhiro , Tamiaki Hitoshi
Published: July 2006

In an alkaline aqueous solution, photochemical valence isomerization of norbornadiene derivative 1 to quadricyclane derivative 2 occurred quantitatively, and reverse isomerization of 2 to 1 under release of heat was achieved by catalytic action of cobalt hematoporphyrin 3 and analogues. This system may be of a great practical use for a solar energy storage.
C–CN BOND CLEAVAGE UNDER MILD CONDITIONS PROMOTED BY ELECTRON-RICH COBALT COMPLEXES
Authors: Ozawa Fumiyuki , Iri Kiyoshi , Yamamoto Akio
Published: July 2006

Electron-rich cobaltate dinitrogen complex, [Co(PPh3)3N2]Li(Et2O)3  1, reacts with alkyl and aryl nitrile compounds causing the cleavage of C–CN bond under mild conditions to release hydrocarbons. Catalytic activity of the cobalt complex to isomerize allyl cyanide to crotononitrile is also noted.
SYNTHESIS OF COMPOUNDS RELATED TO SCLEROSPORAL
Authors: Kumonaka Takahiro , Kanai Yasuhiro , Yanagiya Mitsutoshi , Matsumoto Takeshi
Published: July 2006

The proposed guaianoid structures for sclerosporal have turned out to be erroneous through synthesis of these structures, starting from (−)-carvone.
NUCLEOPHILIC SUBSTITUTION ON SULFUR WITH RETENTION OF CONFIGURATION IN THE FORMATION OF o-METHOXYPHENYL PHENYL-N-POLYHALOACETYLSULFILIMINES
Authors: Oae Shigeru , Kikuchi Katsuaki , Moriyama Masaru , Furukawa Naomichi
Published: July 2006

Optically active o-methoxyphenyl phenyl-N-polyhaloacetylsulfilimines obtained in good yields upon simple treatment of a mixture of o-methoxyphenyl phenyl sulfide and t-butyl hypochlorite in the presence of l-menthol and polyhaloacetamide anion, are found to be rich in R-configuration. This means that the nucleophilic substitution of the incipiently formed (Rs)-l-menthyloxysulfonium salt with the polyhaloacetamide anion proceeds with retention of configuration.
CYANOSELENENYLATION OF KETENE ACETALS. SYNTHESIS OF CARBONYL-PROTECTED α-OXO CARBONITRILES
Authors: Tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

The reaction of ketene acetals with phenyl selenocyanate afforded a new type of compounds, α,α-dioxy-β-phenylseleno carbonitriles(carbonyl-protected α-oxo carbonitriles), in good yields. Oxidation of these vicinal cyanoselenenylation products gave β,γ-unsaturated α,α-dioxy carbonitriles in excellent yields.