bluuebunny/crossref_metadata_2025 huggingface dataset:
DETERMINATION OF RADON IN SOIL GAS BY AN OPENED COUNTING VIAL AND LIQUID SCINTILLATION COUNTER
Authors: Horiuchi Kimiko , Murakami Yukio
Published: July 2006

An opened counting vial containing liquid scintillator solution, suspended in a hole of the ground, absorbs a definite fraction of radon present in the soil gas allowing the total radon concentration to be determined. Natural level of radon in soil gas was measured. This method is rapid, simple and sensitive.
FURTHER IMPROVEMENTS OF OLIGODEOXYRIBONUCLEOTIDES SYNTHESIS: SYNTHESIS OF TETRADEOXYADENYLATE ON A NEW SILICA GEL SUPPORT USING N6-PHTHALOYLDEOXYADENOSINE
Authors: Kume Akiko , Sekine Mitsuo , Hata Tsujiaki
Published: July 2006

Introduction of a long alkyl chain between the nucleoside and the silica gel support was effective in DNA synthesis via the phosphotriester method. dApApApA containing 3′-terminal deoxyadenosine was successfully synthesized on the support by using N6-phthaloyldeoxyadenosine.
VAPOR-PHASE BECKMANN REARRANGEMENT OF CYCLOHEXANONE OXIME OVER BORIA-HYDROXYAPATITE CATALYST
Authors: Izumi Yusuke , Sato Satoshi , Urabe Kazuo
Published: July 2006

The boron trioxide coupled with hydroxyapatite was found to catalyze the Beckmann rearrangement of cyclohexanone oxime in the vapor phase at 300 °C more selectively than boria-alumina and silica-alumina. The basic property of hydroxyapatite appears to play an important role in effecting the rearrangement selectively.
WAVELENGTH-DEPENDENT PHOTOCHEMISTRY OF 2,3-DIMETHYL-2-BUTENE AND 2-OCTENE IN SOLUTION
Authors: Inoue Yoshihisa , Mukai Toshio , Hakushi Tadao
Published: July 2006

Direct irradiations of the title compounds were performed at 185, >200, >220, and 228 nm in hydrocarbon solvents. The evident wavelength dependence of the product distributions observed is of importance in specifying the excited state involved in the formation of each photoproduct, and suggests that more than two excited singlet states of an alkene undergo distinctly different photoreactions rather than suffer mutual conversions between the states.
RATE OF LIGAND EXCHANGE OF TRIS(ACETYLACETONATO)IRON(III) WITH TRIFLUOROACETYLACETONE AND TRIS(TRIFLUOROACETYLACETONATO)IRON(III) WITH ACETYLACETONE IN CARBON TETRACHLORIDE
Authors: Sekine Tatsuya , Inaba Kazuho
Published: July 2006

The rate of ligand exchange of tris(acetylacetonato)iron(III) with trifluoroacetylacetone and tris(trifluoroacetylacetonato)iron(III) with acetylacetone in carbon tetrachloride has been measured spectrophotometrically and the reaction mechanism was discussed. Use of non-polar solvents as the medium was concluded to be favorable for kinetic studies of this type.
12-TUNGSTOPHOSPHATES AS DEHYDROGENATION CATALYSTS DEHYDROGENATION OF MONOMETHYLAMINE TO HYDROGENCYANIDE
Authors: Niiyama Hiroo , Tamai Shoji , Saito Yoshinori , Echigoya Etsuro
Published: July 2006

Monomethylamine is dehydrogenated to yield hydrogencyanide by the catalysis of 12-tungstophosphates at temperature range of 400–500 °C. Simultaneous hydrogenolysis to yield methane and ammonia was also observed. Typical solid acid catalysts, such as Al2O3 or SiO2–Al2O3 have no activity for the reaction. Catalytic activity for the dehydrogenation might be ascribed to the affinity of polyanion to hydrogen atoms.
HIGHLY SELECTIVE INTRODUCTION OF CONJUGATED DIENES TO GOOD DIENOPHILES, α,β-UNSATURATED CARBONYL COMPOUNDS AND p-QUINONES, WITHOUT FORMATION OF DIELS–ALDER ADDUCT
Authors: Naruta Yoshinori , Nagai Naoshi , Arita Yoshihiro , Maruyama Kazuhiro
Published: July 2006

The reaction of 2,4-pentadienyltrimethylstannane with α,β-unsaturated carbonyl compounds and p-quinones in the presence of Lewis acid affords the corresponding pentadienylated products in fair to good yield without formation of any Diels–Alder adduct.
BASE-INDUCED CYCLIZATION OF (2R,3R)- AND (2S,3R)-N-2,4-DIMETHOXYBENZYL-N-BIS(ETHOXYCARBONYL)METHYL-2-BROMO-3-HYDROXYBUTYLAMIDE
Authors: Shiozaki Masao , Ishida Noboru , Hiraoka Tetsuo , Maruyama Hiroshi
Published: July 2006

Reaction of (2R,3R)-N-2,4-dimethoxybenzyl-N-bis(ethoxycarbonyl)methyl-2-bromo-3-hydroxybutylamide (6) with DBU yielded bicyclic β-lactam 7 by a direct cyclization, and its diastereomer 8 and unexpected γ-lactam 9 by another non-direct cyclization. Also (2S,3R)-isomer 19 gave 8 as a sole product. On the other hand, reactions of 6 and 19 with NaH advanced to afford azetidin-2-one derivatives via the corresponding epoxides.
TITANIUM DIOXIDE PHOTOCATALYZED OXIDATION OF AROMATIC HYDROCARBONS: THE ROLE OF WATER AND OXYGEN TO INDUCE AROMATIC HYDROXYLATION
Authors: Shimamura Yasuo , Misawa Hiroaki , Oguchi Takahide , Kanno Tatsuya , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

Careful examination of the effects of oxygen and water on titanium dioxide photocatalyzed oxidation of benzene and toluene has revealed that electron transfers from water and toluene to the photogenerated positive holes, synchronized with electron transfer from the photoexcited titanium dioxide to oxygen, result, respectively, in aromatic nuclear hydroxylation giving phenolic products and in oxidation of the side chain of toluene affording benzyl alcohol and benzaldehyde.
A NEW ANTINEOPLASTIC METHYLGERMANIUM(IV)PORPHYRIN
Authors: Miyamoto T Ken , Sugita Norifumi , Matsumoto Yuji , Sasaki Yukiyoshi , Konno Michiko
Published: July 2006

A new highly lipophilic methylgermanium(IV)porphyrin; dimethyl-5,10,15,20-tetrakis[3′,5′-bis(1″,1″-dimethylethyl)phenyl]porphynatogermanium(IV) (Abbr. MGP), has been prepared and characterized. The isolated compound showed considerable activity toward neoplastic tissues both in vitro and in vivo.
CRYSTAL STRUCTURE OF A 1:2 MOLECULAR COMPLEX OF 2,5-BIS(2,4-DIMETHYLPHENYL)HYDROQUINONE AND ETHANOL
Authors: Toda Fumio , Tanaka Koichi , Mak Thomas C W
Published: July 2006

A centrosymmetric 1:2 hydrogen-bonded adduct of 2,5-bis(2,4-dimethylphenyl)hydroquinone and ethanol has been determined by X-ray crystallography. Its layer-type architecture is conducive to the replacement of ethanol by various alcohols to yield a series of isostructural molecular complexes.
HYDROXYLATION OF BENZENES INVOLVING THE NIH SHIFT UTILIZING ELECTRONIC MODEL COMPOUND FOR MONOOXYGENASES
Authors: Kojo Shosuke , Fukunishi Koushi
Published: July 2006

The reaction of anisole-4-2H or toluene-4-2H with 2-hydroperoxyhexafluoro-2-propanol gave corresponding phenols involving the NIH shift, the extent of which was 57% and 51% respectively. These values were very close to those of cytochrome P450.
AN ALTERNATIVE ROUTE TO PERALKYLCYCLOPOLYSILANES: THE REACTION OF 1,2-DICHLOROTETRAALKYLDISILANES WITH LITHIUM
Authors: Watanabe Hamao , Inose Jun , Fukushima Koji , Kougo Yuichi , Nagai Yoichiro
Published: July 2006

The reaction of 1,2-dichlorotetraalkyldisilanes, Cl(R1R2Si)2Cl (R1=R2=iPr; R1, R2=iPr, Me; R1, R2=Me3SiCH2, Me; R1, R2=tBuCH2, Me; R1, R2=tBu, Me), with an excess amount of lithium in tetrahydrofuran gave the corresponding peralkylcyclopolysilanes, [R1R2Si]n (n=4–5), under mild conditions.
OXYGENATION OF 4-NITROPHENYLHYDRAZONES OF α,β-ENONES WITH Co(SALPR)
Authors: Nishinaga Akira , Yamazaki Shigekazu , Matsuura Teruo
Published: July 2006

Oxygenation of 4-nitrophenylhydrazones of α,β-enones with Co(Salpr), a five coordinate cobalt(II) Schiff base complex, results in the oxidative cleavage of the double bond in the substrate. A proposed mechanism involves the decomposition of peroxidic intermediate via a dioxetane, which is promoted by the nitro group.
SYNTHETIC STUDIES ON THE CAPNELLANE ALCOHOLS: AN EFFICIENT METHOD FOR THE CONSTRUCTION OF THE C-RING BISALLYLIC ALCOHOL UNIT
Authors: Shibasaki Masakatsu , Mase Toshiaki , Ikegami Shiro
Published: July 2006

An efficient method for the construction of the bisallylic alcohol unit, which is uniquely associated with the capnellane alcohols, is reported.
LOW TEMPERATURE ISOMERIZATION OF PARAFFINS OVER ALUMINA TREATED WITH CF3Cl
Authors: Kurosaki Akito , Okazaki Susumu
Published: July 2006

Paraffins such as butane, pentane, and hexane were isomerized, at temperatures as low as 0 °C, over Al2O3 treated with CF3Cl. The isomerizations were promoted by strong acid sites having Ho values of −13.75≥HO>−14.52, which were formed on the treated surface.
THE REACTION OF PYRIDINE N-OXIDE AND ITS BENZOANALOGUES WITH ARENESULFONYL AZIDES: NOVEL SYNTHESIS OF TETRAZOLOAZlNES
Authors: Reddy K Sreenivas , Iyengar D S , Bhalerao U T
Published: July 2006

Pyridine N-Oxide reacts with arenesulfonyl azides under thermal conditions, to form tetrazolo[l,5-a]pyridine. The condensed pyridine N-Oxides also behaved similarly, giving the respective tetrazoloazines. These reaction results indicate a novel azido transfer from arenesulfonyl azides and provide an alternative route to tetrazoloazines.
CHIRALITY INVERSION OF THE 1,3-GLYCOL SYSTEM AND ITS APPLICATION TO THE SYNTHESIS OF THE CARBAPENEM INTERMEDIATE
Authors: Takano Seiichi , Kasahara Chiyoshi , Ogasawara Kunio
Published: July 2006

Novel chirality inversion of the butane-1,3-diol system (4) and its application to the synthesis of the carbapenem intermediate are described.
t-BUTYLPEROXY COBALT(III) SCHIFF BASE COMPLEXES. PREPARATION AND PROPERTIES
Authors: Nishinaga Akira , Tomita Haruo , Ohara Hidekazu
Published: July 2006

Treatment of t-butyl hydroperoxide with cobalt(II) Schiff base complexes in CH2Cl2 at room temperature gave the corresponding t-butylperoxy cobalt(III) complexes, which were isolated as crystals in good yield. The peroxy complexes oxidize Ph3P to Ph3PO and the Co–O bond in the peroxy complexes undergoes heterolysis with acids but homolysis in alcohols.
DETECTION OF AN INTERMEDIATE TERNARY COMPLEX IN THE REDUCTION OF p-BENZOQUINONE DERIVATIVES BY AN NADH MODEL COMPOUND IN THE PRESENCE OF Mg2+ ION
Authors: Fukuzumi Shunichi , Nishizawa Nobuaki , Tanaka Toshio
Published: July 2006

A transient charge-transfer (CT) band of a ternary complex due to the CT transition from an NADH model compound — Mg2+ ion complex to a p-benzoquinone derivative was observed in the reduction of a p-benzoquinone derivative by an NADH model compound in the presence of Mg2+ ion in acetonitrile. The role of the ternary complex in the reduction by an NADH model compound is reported.
SELECTIVITY OF POLY(ANILINE) FILM-COATED ELECTRODE FOR REDOX REACTIONS OF SPECIES IN SOLUTION
Authors: Oyama Noboru , Ohnuki Yukio , Chiba Kazuyuki , Ohsaka Takeo
Published: July 2006

The polymer films, prepared by the electrochemical polymerization of aniline and its derivatives, were electroactive in an acidic solution. Electrodes coated with these films were possessed of the selectivity for the redox reaction of species in solution.
PERACID-INDUCED OXIDATION OF 2,5-DISUBSTITUTED FURANS TO CIS-1,2-DIACYLETHYLENES
Authors: Kobayashi Yuichi , Katsuno Harutaka , Sato Fumie
Published: July 2006

2,5-Disubstituted furans are oxidatively cleaved by peracids to cis-1,2-diacylethylenes in high yields under mild conditions.
IMPORTANCE OF SURFACE OXYGEN UNDETECTABLE WITH ESR ON Co–MgO FOR OXIDATIVE DEHYDROGENATION OF ETHANE
Authors: Aika Ken-ichi , Tajima Masaki , Onishi Takaharu
Published: July 2006

Adsorbed oxygen, which is produced from N2O on Co–MgO and does not show any ESR signals, was found to be active for the oxidative dehydrogenation of ethane as well as O− which is observable with ESR. Since the adsorbed oxygen can only be regenerated in the catalysis condition, it should be a reactive oxygen species involved in the catalytic cycle of this reaction.
HIGHLY CHEMOSELECTIVE SYNTHESIS OF KETONES FROM CARBOXYLIC ACIDS AND GRIGNARD REAGENTS USING α-CHLOROENAMINES AS A CONDENSATION REAGENT
Authors: Fujisawa Tamotsu , Mori Toshiki , Higuchi Kazunobu , Sato Toshio
Published: July 2006

α-Chloroenamines are found to be an effective condensation reagent of carboxylic acids and Grignard reagents under mild conditions to afford chemoselectively the corresponding ketones in high yields and in one-pot operation.
REACTION OF BENZYNES WITH 9-t-BUTYLTHIOANTHRACENE TO AFFORD 9-t-BUTYLTHIOTRIPTYCENES
Authors: Nakamura Nobuo
Published: July 2006

Reaction of benzynes (3a, c, d) with 9-t-butylthioanthracene (2d) resulted in formation of the corresponding 9-t-butylthiotriptycenes (5a, c, d) and 5-t-butylthio-6,ll-dihydro-6,11-ethenonaphthacenes (6a, c, d), while that of 1,4-dimethoxybenzyne (3b) with 2d did not give the corresponding adducts (5b, 6b).
CRYSTAL STRUCTURES OF PERMETHYLATED α-CYCLODEXTRIN COMPLEXES WITH l- AND d-MANDELIC ACIDS
Authors: Harata Kazuaki , Uekama Kaneto , Otagiri Masaki , Hirayama Fumitoshi
Published: July 2006

The crystal structures of permethylated α-cyclodextrin complexes with l- and d-mandelic acids were determined by the X-ray method. The host molecule of the l-mandelic acid complex, having a pseudo two-fold symmetry, loosely includes the phenyl group, while the hydroxyl and carboxyl groups form hydrogen bonds with water molecules located outside the host cavity. d-Mandelic acid is tightly bound within the host cavity, forming a host–guest hydrogen bond.
PREPARATION AND CRYSTAL STRUCTURE OF A BINUCLEAR COPPER(II) COMPLEX BRIDGED BY AN ALKOXO-OXYGEN ATOM AND AN ACETATE ION
Authors: Nishida Yuzo , Takeuchi Masataka , Takahashi Kazuhiro , Kida Sigeo
Published: July 2006

New binuclear copper(II) complex bridged by an alkoxo-oxygen atom and an acetate ion was prepared, and its crystal structure was determined by X-ray diffraction method.
1,1′-OXALYLDIIMIDAZOLE, A NEW REAGENT FOR ACTIVATION OF CARBOXYLIC ACID
Authors: Murata Shizuaki
Published: July 2006

Carboxylic acids and their salts are converted into the 1-acylimidazoles by the title reagent. This reaction is applied for esterification of fatty acids.
TIN(II) ENEDIOLATE FROM METHYLGLYOXAL
Authors: Mukaiyama Teruaki , Tsuzuki Ryuji , Kato Jun-ichi
Published: July 2006

Methylglyoxal is successfully converted to the tin(II) enediolate on treatment with activated metallic tin. The tin(II) enediolate reacts with several aldehydes to give α, β-dihydroxyketones in good yields.
ENANTIOSPECIFIC SYNTHESIS OF (+)-ERYTHRO-(5S,6R)-6-ACETOXY-5-HEXADECANOLIDE, AN OPTICALLY ACTIVE FORM OF THE MAJOR COMPONENT OF A MOSQUITO OVIPOSITION ATTRACTANT PHEROMONE
Authors: Masaki Yukio , Nagata Kinnosuke , Kaji Kenji
Published: July 2006

(+)-Erythro-(5S,6R)-6-acetoxy-5-hexadecanolide, an optically active form of the major component of an oviposition attractant pheromone of a mosquito Culex pipiens fatigans, was synthesized enantiospecifically from (+)-(R,R)-diethyl tartrate.
X-RAY AND 13C NMR ANALYSES OF CONFORMERS OF 5-ARYLAMINO-1,2,4-TRIOXAN
Authors: Yamamoto Hiroshi , Nakai Izumi , Kashima Choji , Omote Yoshimori , Akutagawa Masamoto
Published: July 2006

The X-ray analysis of 5-(o-chloroanilino)-3-isopropyl-6,6-dimethy1-1,2,4-trioxan showed to be the chair conformation of the trioxan ring with the axial o-chloroanilino and the equatorial isopropyl groups, which structure was also supported by 13C NMR.
MoO3-SILICATE SLUDGE CATALYST FOR COAL LIQUEFACTION
Authors: Nishijima Akio , Kurita Minoru , Uchida Kunio , Sato Toshio , Yoshimura Yuji , Shimada Hiromichi
Published: July 2006

Silicate sludge obtained from a geothermal power generation plant was applied to prepare the catalyst for coal liquefaction. The sludge has a very high surface area, a large pore volume, and a wide-range pore size distribution. It was found that the activity of the catalyst prepared by supporting MoO3 on the sludge is superior to commercially available Ni–Mo/Al2O3 catalyst.
CHEMICAL REACTIVITY OF OXYGEN SPECIES ON γ-Bi2MoO6 STUDIED BY X-RAY PHOTOELECTRON SPECTROSCOPY (XPS)
Authors: Okamoto Yasuaki , Morikawa Fumito , Degawa Junji , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

XPS studies of the reduction behavior of γ-Bi2MoO6 were carried out by using various reactants. It was found that in the initial reduction stage, H2 reduced Mo alone, while allyl alcohol removed preferentially oxygen anions bound to Bi. With 1-butene, simultaneous reductions of Bi and Mo were observed. The reactivity and inter-layer diffusion of oxygen anions are discussed.
EVIDENCE FOR STACKING OF CATIONIC PORPHYRIN IN AQUEOUS SOLUTION
Authors: Kano Koji , Miyake Takahisa , Uomoto Kenji , Sato Toshinori , Ogawa Teiichiro , Hashimoto Shizunobu
Published: July 2006

The dilute aqueous solutions (2×10−7–1×10−5 mol dm−3) of 5,10,15,20-tetrakis(4-N-methylpyridyl)porphine (TMPyP) showed a broad fluorescence emission band, which was split into two bands with increasing temperature and/or further dilution. These results as well as the effects of additives on the fluorescence spectrum indicated that TMPyP molecules stack in water.
DIRECT SYNTHESIS OF HYDRAZINE OVER METAL OXIDE CATALYSTS UNDER SILENT DISCHARGE
Authors: Miyahara Koshiro
Published: July 2006

The direct synthesis of hydrazine over solid surfaces was performed by means of various metal oxide catalysts and activation of gas by silent discharge at room temperature.
SILVER-CATALYZED REDUCTIVE DEHALOGENATION OF 1,1-DIBROMOCYCLOPROPANES
Authors: Shimizu Nobujiro , Watanabe Kenji , Tsuno Yuho
Published: July 2006

1,1-Dibromocyclopropanes underwent rapid reduction to the corresponding monobromides in high yields on treating with LiAlH4-1 mol% silver perchlorate in THF, presumably via a silver-catalyzed radical chain mechanism.
PREPARATION OF THIN SOLID FILMS IN THE Co–O SYSTEM BY REACTIVE RF SPUTTERING
Authors: Koumoto Kunihito , Motoyoshi Hitoshi , Yanagida Hiroaki
Published: July 2006

Thin solid films in the Co–O system were prepared by reactive RF sputtering and the phase relationships were established as functions of reaction temperature and oxygen partial pressure. Electrical resistivity of grain-oriented Co3O4 films was microstructure-sensitive and depended on the crystallite size.
SELECTIVE HYDROGENATION OF CARBON–CARBON DOUBLE BONDS OF CHALCONES BY THE AID OF A MICROORGANISM
Authors: Ohta Hiromichi , Konishi Jin , Tsuchihashi Gen-ichi
Published: July 2006

Chalcone and substituted chalcones are selectively hydrogenated on C=C double bonds by incubation with Corynebacterium equi IFO 3730, to give the corresponding saturated ketones.
PHOTOCHEMICAL REACTIONS OF N′,N′-DIALKYL-N-aroylureas
Authors: Aoyama Hiromu , Sakamoto Masami , Ohnota Michiro , Omote Yoshimori
Published: July 2006

N′,N′-Dibenzyl and N′,N′-diisopropyl-N-aroylureas undergo cyclization on irradiation to give the corresponding imidazolidin-2-ones via intramolecular hydrogen abstraction by the aroyl carbonyl group.
A SIMPLE ONE-POT CONVERSION OF ARYL HALIDES INTO ARYLACETONITRILES
Authors: Suzuki Hitomi , Kobayashi Tsutomu , Yoshida Yoshiki , Osuka Atsuhiro
Published: July 2006

When heated in hexamethylphosphoric triamide in the presence of copper(I) iodide, aryl iodides and bromides react with cyanoacetate anion to form arylcyanoacetates, which lose the ester group on hydrolysis, giving the corresponding arylacetonitriles in good to moderate yields.
AN ACTIVE METHANATION CATALYST PREPARED FROM AN AMORPHOUS Pd35Zr65 ALLOY
Authors: Yokoyama Akinori , Komiyama Hiroshi , Inoue Hakuai , Masumoto Tsuyoshi , Kimura Hisamichi
Published: July 2006

Highly active methanation catalyst was prepared in situ from an amorphous Pd35Zr65 alloy. In the reaction at 260°C, 1 atm, the catalytic avtivity remarkably increaed with time, showing about hundred fold enhancement, compared with the initial value, at the steady state attained in 60 h. Thr turnover frequency was greater than or comparable to those for the most active methanation catalysts as ever known.
1,1,3,3-TETRAMETHYL-4,5-BIS(TRIMETHYLSILYL)-1,3-DISILACYCLOPENT-4-ENE. PREPARATION BY THE FIRST METHYLENE INSERTION REACTION INTO A SILICON–SILICON BOND AND ANION RADICALS1)
Authors: Sakurai Hideki , Nakadaira Yasuhiro , Tobita Hiromi
Published: July 2006

The title compound was prepared by the reaction of 1,1,2,2-tetramethyl-3,4-bis(trimethylsilyl)-1,2-disilacyclobutene with photochemically generated methylene. Anion radicals of the title compound showed temperature dependence due to ring flipping.
ZIRCONIUM ASSISTED REGIOSELECTIVE ACYLATION OF DIENES WITH SATURATED OR UNSATURATED ESTERS TO LEAD TO β,γ-UNSATURATED CARBONYL COMPOUNDS
Authors: Akita Munetaka , Yasuda Hajime , Nakamura Akira
Published: July 2006

Regioselective formylation or acylation of isoprene at the C1 atom was realized by reaction of Cp2Zr(isoprene) with saturated esters followed by protonolysis with acetic acid. The corresponding reaction with various alkyl acrylates resulted in the formation of allyl vinyl ketones.
STRUCTURES OF MONO- AND BIS(2-BUTENYL)ZIRCONIUM COMPLEXES IN SOLUTION AND THREO SELECTIVE INSERTION REACTION OF ALIPHATIC ALDEHYDES
Authors: Mashima Kazushi , Yasuda Hajime , Asami Keiichi , Nakamura Akira
Published: July 2006

2-Butenyl group of Cp2ZrCl(C4H7), Cp2Zr(C4H7)2 and [Cp2Zr(C4H7)3·MgCl·THF] prepared from Cp2ZrCl2 and 2-butenylmagnesium chloride has essentially the (E)-configuration. These complexes react with aldehydes threo selectively at −78°C. Zr(OR)4/C4H7MgCl and Ti(OR)4/C4H7MgCl systems also serve as efficient reagents for threo selective synthesis of methylhomoallyl alcohols.
STRUCTURE OF AJUGARIN-V
Authors: Kubo Isao , Fukuyama Yoshiyasu , Chapya Andrew
Published: July 2006

The structure of a neo-clerodane diterpene, ajugarin-V isolated from Ajuga remota (Labiatae) has been established by means of spectroscopic and chemical data.
A MILD REDUCTION OF BENZYL ALCOHOLS WITH DIPHOSPHORUS TETRAIODIDE
Authors: Suzuki Hitomi , Tani Hiroyuki , Kubota Hirohisa , Sato Naofumi , Tsuji Junko , Osuka Atsuhiro
Published: July 2006

On treatment with diphosphorus tetraiodide in boiling benzene, benzyl alcohols are smoothly reduced to parent hydrocarbons in good to moderate yields.
RESPONSE TIME CURVES OF AMMONIUM ION-SELECTIVE ELECTRODE OF TUBULAR SHAPE
Authors: Degawa Hisao , Shinozuka Noriko , Hayano Shigeo
Published: July 2006

In order to reproducibly measure response time curves of a poly (vinyl chloride) matrix membrane ammonium ion-selective electrode, an experimental setup composed of a tubular flow-through electrode was constructed. The data were analyzed by the curve fitting method using two theoretical equations, that based on the assumption of the film diffusion and that of the diffusion within the membrane.
LAUREACETAL-C, AN UNUSUAL SECOCHAMIGRANE SESQUITERPENE FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Suzuki Teruaki , Suzuki Minoru , Kurosawa Etsuro
Published: July 2006

An unusual sesquiterpene α,β-unsaturated ketone, designated as laureacetal-C, has been isolated from the title alga and its structure was determined by the spectral and chemical methods.
PHOTOSENSITIZED CARBON–OXYGEN BOND CLEAVAGE REACTION OF EPOXIDES BY 2,4,6-TRIPHENYLPYRYLIUM TETRAFLUOROBORATE SALT
Authors: Okada Keiji , Hasegawa Eietsu , Mukai Toshio
Published: July 2006

The carbon–oxygen bond cleavage of epoxides, (1) and (3), was photochemically sensitized by 2,4,6-triphenylpyrylium tetrafluoroborate in methylene chloride to give carbonyl compounds, (2) and (4), with high efficiency (Φ>1) respectively. The reaction efficiency was strongly dependent on solvents and counter ions of the sensitizer.
RADICAL ION PAIR MECHANISM OF THE PHOTOCHEMICAL ISOMERIZATION OF ISOQUINOLINE N-OXIDE IN HYDROXYLIC SOLVENTS, INCLUDING THE MAGNETIC FIELD EFFECT
Authors: Hata Norisuke , Yagi Atsushi
Published: July 2006

It was found that, while the photochemical isomerization of isoquinoline N-oxide into lactam shows magnetic field effect due to HFI-J mechanism, the N-oxides bearing an electron-donating substituent are insensitive to an external magnetic field. The results support strongly “radical ion pair mechanism” of the photochemical isomerization.
PHOTOCATALYTIC SYNTHESIS AND PHOTODECOMPOSITION OF AMMONIA OVER SrTiO3 AND BaTiO3 BASED CATALYSTS
Authors: Li Qing-shui , Domen Kazunari , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

Photocatalytic synthesis of ammonia from N2 and H2O and its photodecomposition were investigated over SrTiO3 and BaTiO3 based catalysts. It was demonstrated that the yield of NH3 formation increased markedly by the use of RuO2 and NiO doped three component catalysts and that photodecomposition of NH3 was coupled with photodecomposition of H2O.
SYNTHESIS OF ADIPOSIN-1, α-GLUCOSIDE HYDROLASE INHIBITOR
Authors: Ogawa Seiichiro , Iwasawa Yoshikazu , Toyokuni Tatsushi , Suami Tetsuo
Published: July 2006

Adiposin-1, the common constituent of pseudo-oligosaccharidic α-glucoside hydrolase inhibitor, adiposin, has been synthesized by coupling of the disaccharide epoxide and the protected Dl-valienamine, followed by deblocking.
REACTION OF 2,3-ANHYDR0-4,6-O-BENZYLIDENE-α-d-HEXOPYRANOSIDES WITH PROPENYLMAGNESIUM CHLORIDES. REGIOSELECTIVE CARBON CHAIN EXTENSION AT THE C-2 POSITION OF HEXOPYRANOSIDES
Authors: Asano Tadahiko , Yokota Sumio , Mitsunobu Oyo
Published: July 2006

The reaction of 2-propenylmagnesium chlorides with methyl 2,3-anhydro-4,6-O-benzylidene-α-d-allopyranoside (1) or -gulopyranoside (6) exclusively afforded the corresponding 2-deoxy-2-C-(2-propenyl)-α-d-hexopyranosides (4b, 8a, and 8b).
A KINETIC DETERMINATION OF ULTRATRACE AMOUNTS OF CHROMIUM(III) BY ITS CATALYTIC EFFECT
Authors: Nakano Shigenori , Hinokuma Satoru , Kawashima Takuji
Published: July 2006

A new sensitive kinetic method is proposed for the determination of chromium(III). The method is based on its catalytic effect on the reaction of 3-methyl-2-benzothiazolone hydrazone with N,N-dimethylaniline to form a violet compound (λmax=590 nm) in the presence of hydrogen peroxide and ethylenediamine-N,N,N′,N′-tetraacetic acid as an activator. The method is selective and sensitive.
LIGHT ENERGY CONVERSION WITH ANABAENA CYLINDRICA COATED METHYL VIOLOGEN-POLYSTYRENE SULFONATE–COATED ELECTRODE
Authors: Kobayashi Katsuyoshi , Sagara Takamasa , Okada Mitsumasa , Niki Katsumi
Published: July 2006

A blue-green alga, Anabaena eylindvioa, immobilized on the methyl viologen–polystyrene sulfonate–polyvinyl alcohol coated SnO2 electrode showed a remarkable photoanodic current. The photocurrent onset potential corresponded to the energy level of the redox potential of methyl viologen, which was sufficient to generate hydrogen at a cathode.
CRYSTAL STRUCTURE OF (S-(2-AMINOETHYL)-l-HOMOCYSTEINATO)(GLYCINATO)COBALT(III) PERCHLORATE
Authors: Okamoto Ken-ichi , Suzuki Masutaro , Hidaka Jinsai
Published: July 2006

Four isomers of the title complex, [Co(l-aehc)(gly)]+, were chromatographically isolated. The crystal structure and absolute configuration of the third eluted isomer were determined by X-ray diffraction study. This isomer has Δ configuration. The sulfur donor atom in the coordinated l-aehc has R configuration and the six-membered chelate ring takes a chair conformation.
THE ADSORPTION OF METHYL IODIDE ON SILVER-IMPREGNATED SILICA GELS
Authors: Ishikawa Tatsuo , Amano Eiichi , Muroya Masaaki , Kondo Seiichi
Published: July 2006

Both the reversible and irreversible adsorption sites for methyl iodide molecules are found on the silver-impregnated silica gel surface. The former sites are the free silanol groups, while the latter sites are the silver ions for which the protons of free silanol groups are ion-exchanged.
DIOXETANO-CROWN ETHERS. STABILIZATION THROUGH COMPLEXATION WITH METAL IONS
Authors: Inoue Yoshihisa , Ouchi Mikio , Hayama Hidekazu , Hakushi Tadao
Published: July 2006

The first members of dioxetanocrown ethers 3 and 4 were prepared in methylene blue-sensitized photooxygenations of 9- and 18-membered stilbenocrown ethers 1 and 2, and the activation parameters for the thermolyses of 3 and 4 were obtained. Thermal decomposition of the bis-dioxetano-18-crown-6 4 was decelerated or accelerated in the presence of alkali metal salts depending upon the nucleophilicity of the counter anion.
OBSERVATION DE LA BANDE OO DANS LA TRANSITION SECONDAIRE DE L’lON ANILlNIUM
Authors: Denis-Courtois Danielle , Vidal Bernard
Published: July 2006

The OO band in the second transition of the anilinium ion was observed for the first time in a concentrated sulfuric acid medium.
NEW ATROPISOMERIC CHIRAL BISPHOSPHINE, (S)-6,6′-DIMETHYL-2,2′-BIS(DIPHENYLPHOSPHINAMINO)BIPHENYL, AND ASYMMETRIC HYDROGENATION USING THE Rh(I) COMPLEX THEREOF
Authors: Uehara Akira , Kubota Tohru , Tsuchiya Ryokichi
Published: July 2006

Atropisomeric chiral bisphosphine, (S)-6,6′-dimethyl-2,2′-bis(diphenylphosphinamino)biphenyl (MABP) was newly prepared, and the Rh(I) complex thereof was found to be highly effective for the asymmetric hydrogenation of 2-acetamidoacrylic acid even under 1 atm of hydrogen pressure at a temperature below 0°C.
INFRARED-INDUCED CONFORMATIONAL ISOMERIZATIONS OF ALLYLAMINE AND ALLYL ALCOHOL IN LOW-TEMPERATURE MATRICES
Authors: Nakata Munetaka , Tasumi Mitsuo , Hamada Yoshiaki , Tsuboi Masamichi
Published: July 2006

The infrared spectra of allylamine and allyl alcohol have been studied in low-temperature matrices. In argon matrices these molecules show rapid spectral changes upon exposure to the radiation from the light source of an infrared spectrophotometer. These spectral changes arise from the conformational isomerizations from a rotational isomer with the cis conformation about the C–C bond to those with the skew conformation. No such conformational isomerization has been observed in nitrogen matrices.
OXYGEN-BINDING AFFINITY OF LIPOSOMAL HEME UNDER SEMI PHYSIOLOGICAL CONDITIONS
Authors: Tsuchida Eishun , Nishide Hiroyuki , Yuasa Makoto , Sekine Mikiya
Published: July 2006

Oxygen-binding affinity (P1⁄2) of the meso-tetra-(α,α,α,α-(o-pivalamidophenyl))porphinato iron(II)-mono-(1-lauryl-2-methylimidazole) complex incorporated in liposome of phosphatidylcholine was measured at pH 7.0 and 15∼37 °C. The P1⁄2 values at 37 °C were similar to that of hemoglobin in blood (ca. 49 mmHg) and dependent on the phase state of phospholipid.
REGENERATION OF V2O5–TiO2 CATALYSTS FOR NITROGEN MONOXIDE REDUCTION POISONED BY POTASSIUM SALTS
Authors: Fujimoto Kaoru , Shikada Tsutomu
Published: July 2006

The activities of V2O5–TiO2 catalysts poisoned by potassium salts were recovered from 70 to 90% compared to that of the virgin catalyst by calcining in air to oxidized all vanadium species to fifth-valence, followed by treating with a solution of sodium sulfate or ammonium sulfate to remove the potassium salts of 97–98%.
DUAL REACTIVITY OF CYCLOHEPTATRIENE AND NORCARADIENE VALENCE ISOMERIZATION SYSTEM: COPE REARRANGEMENT AND INTRAMOLECULAR [2+4] CYCLOADDITION REACTION OF 1-CHLORO-1-(CYCLOHEPTATRIEN-7-YL)-3,3-DIPHENYLALLENE
Authors: Toda Takashi , Shimazaki Norihiko , Hotta Hazime , Hatakeyama Tadahide , Mukai Toshio
Published: July 2006

Titled compound (1) was prepared from benzophenone and 2-(cycloheptatrien-7-yl)ethynylmagnesium bromide. 1 gave the two isomers, i. e., a bicyclo[3.2.2]nonatriene derivative (2) and a formal [2+4] intramolecular cycloaddition product (3). Structural determination of the isomers and plausible mechanisms of the isomerization are discussed.
CONVENIENT ONE-POT SYNTHESIS OF ARENESULFINAMIDES: REACTIONS OF 4-NITROPHENYL SUBSTITUTED PHENYL SULFOXIDES WITH ELEMENTAL SULFUR IN LIQUID AMMONIA
Authors: Sato Ryu , Chiba Shuji , Takikawa Yuji , Takizawa Saburo , Saito Minoru
Published: July 2006

Various arenesulfinamides were synthesized in good yields by one-pot reactions of 4-nitrophenyl substituted phenyl sulfoxides with elemental sulfur in liquid ammonia. The arenesulfinamides were further reduced with elemental sulfur in liquid ammonia to give corresponding disulfides.
THE SILA-PUMMERER REARRANGEMENT OF 1-ALKYL-3-PHENYLSULFINYL-3-TRIMETHYLSILYLCYCLOBUTANOLS. A NEW METHOD FOR THE PREPARATION OF 3-ALKYL-2-CYCLOBUTENONES
Authors: Takeda Takeshi , Tsuchida Toshio , Ando Kazuo , Fujiwara Tooru
Published: July 2006

3-Alkyl-2-cyclobutenones were produced by the sila-Pummerer rearrangement of 1-acetoxy-1-alkyl-3-phenylsulfinyl-3-trimethylsilylcyclobutanes followed by hydrolysis. β-Phenylthio-α,β-and β,γ-unsaturated ketones were major products when the corresponding cyclobutanols were employed.
TRANSVERSE CONDUCTION AND METAL-INSULATOR TRANSITION IN β-(BEDT-TTF)2PF6
Authors: Kobayashi Hayao , Mori Takehiko , Kato Reizo , Kobayashi Akiko , Sasaki Yukiyoshi , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

In the crystal of β-(BEDT-TTF)2PF6, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) molecules are arranged side-by-side. The anisotropy of the electrical resistivity shows that β-(BEDT-TTF)2PF6 is the first organic conductor where the conductivity is the largest along the direction parallel to the molecular plane. The metal-insulator transition is observed at 297 K. The thermoelectric power corresponds to that due to the hole conduction in highly correlated system.
REDUCTION OF DIPHOSPHENE: FORMATION OF dl- AND meso-DIPHOSPHANES
Authors: Yoshifuji Masaaki , Shibayama Katsuhiro , Inamoto Naoki , Watanabe Tokuko
Published: July 2006

Bis(2,4,6-tri-tert-butylphenyl)diphosphene was reduced with aluminum hydrides to give dl- and meso-bis(2,4,6-tri-tert-butylphenyl)diphosphanes as stable compounds.
META-SUBSTITUTION EFFECT ON THE MOLECULAR STRUCTURES OF BIS (ORTHO-DIMETHOXYPHENYL)NICKEL(II) COMPLEXES
Authors: Xu Duanjun , Kai Yasushi , Miki Kunio , Kasai Nobutami , Nishiwaki Koichi , Wada Masanori
Published: July 2006

Molecular structures of novel trans-[NiR2L2] complexes [L=PMe3, R=C6H3(OMe)2-2,6 (1a) and C6H(OMe)2-2,6-Br2-3,5 (2a)] were determined by the X-ray crystal structure analysis, which revealed a remarkable effect of meta-bromo-substitution on the conformation of the ortho-methoxy groups, correlating well with the reactivity difference between 1a and 2a toward carbon monoxide.
BILAYER STRUCTURES OF ARTIFICIAL LIPIDS IN A WATER-SOLUBLE POLYMER BINDER
Authors: Hayashida Shoichi , Sato Hirotsugu , Sugawara Shungo
Published: July 2006

Artificial ammonium type lipids form bilayer structures in water-soluble polymer film similar to those in water dispersion. Bilayer structures were also formed even when the content of the hydrophobic substance is considerably high (50 mole%).
NEW SYNTHESIS OF LOLIOLIDE, DEHYDROLOLIOLIDE, AND 3-OXOACTINIDOL
Authors: Takazawa Osamu , Kogami Kunio , Hayashi Kazuo
Published: July 2006

Loliolide, dehydrololiolide, and 3-oxoactinidol were synthesized from megastigma-4,6,8-trien-3-one by regioselective ozonolysis and epoxidation.
NICKEL-CATALYZED ULLMANN-TYPE COUPLING OF ALKENYL HALIDES WITH ZINC POWDER
Authors: Takagi Kentaro , Hayama Naomi
Published: July 2006

Convenient procedure for an Ullmann-type coupling of alkenyl halides using zinc powder, nickel(II) chloride, and potassium iodide and/or thiourea is presented. One double bond in the produced diene retained the configuration of a starting material, while partial cis–trans isomerization was observed in the second one.
SELECTIVE TRIMERIZATION OF ALIPHATIC ALDEHYDES CATALYZED BY POLYNUCLEAR CARBONYLFERRATES
Authors: Ito Keiji , Kamiyama Nobuhiro , Nakanishi Saburo , Otsuji Yoshio
Published: July 2006

Aliphatic aldehydes undergo a catalytic trimerization to give 1,3-diol monoesters upon treatment with Fe3(CO)12 in pyridine or with Fe3(CO)12-pyridine N-oxide in benzene. Polynuclear carbonylferrates serve as catalyst for this transformation.
INTERMEDIATE IN THE REACTION OF OXOMOLYBDENUM(V) TETRAPHENYLPORPHYRIN COMPLEX WITH SUPEROXIDE ION IN APROTIC SOLVENTS
Authors: Imamura Taira , Hasegawa Koichi , Fujimoto Masatoshi
Published: July 2006

MoVO(tpp)Br (tpp = meso-tetraphenylporphinato) is reduced by superoxide ion, O2−, to MoIVO(tpp) in 1%(v/v) DMSO–CH2Cl2 medium at 25 °C via an intermediate. The intermediate is suggested to be a dioxygen complex and stably exists in the solution at −72 °C. The oxidation state of the central molybdenum in the intermediate complex reversibly changes with temperature between 4+ at −80 °C and 5+ at 0 °C.
SYNTHESIS OF A FIXED PARAQUINOID TAUTOMER OF 8-HYDROXY-5-DEAZAFLAVIN
Authors: Nittala S Sarma , Ikehira Hideyuki , Saito Isao , Matsuura Teruo
Published: July 2006

A fixed paraquinoid tautomer of 8-hydroxy-5-deazaflavin has been synthesized by five-step sequence. The existence of paraquinoid-phenolic tautomerism in ethanolic solution was demonstrated by trapping experiment.
ANIONIC σ-ADDUCTS OF 1-METHYL-3,5-DINITRO-2-PYRIDONE
Authors: Tohda Yasuo , Ariga Masahiro , Kawashima Toshihide , Matsumura Eizo
Published: July 2006

Alkylammonium salts of anionic σ-adducts of 1-methyl-3,5-dinitro-2-pyridone with amine- and carbon-nucleophiles were isolated and characterized. All the nucleophiles are attached to C-6 of the pyridone nucleus. The carbon-adducts are more stable than the amine-adducts, which dissociate in dilute methanol solutions. The acetone-adduct was converted into 4-nitro-1-pyrrolidinylbenzene quantitatively by heating with pyrrolidine.
SIMULTANEOUS REMOVAL OF NOX AND SOX FROM FLUE GAS. EFFECTS OF MOLTEN SALT REACTION MEDIA
Authors: Shikada Tsutomu , Oba Takamasa , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

Among the several combinations of hydrogensulfate salts tested, a molten salt of NaHSO4/LiHSO4 was shown to be most effective as a reaction medium for the simultaneous removal of NOX and SOX from flue gas catalyzed by V2O5. ESR study revealed that V2O5 dissolved in the molten salt was partly reduced, during the reaction, to V4+ suggesting a redox cycle of vanadium constituted an essential part of the catalysis.
STEREOSELECTIVE SYNTHESIS OF A CISOID C10 ISOPRENOID BUILDING BLOCK AND SOME ALL-CIS-POLYPRENOLS
Authors: Sato Kikumasa , Miyamoto Osamu , Inoue Seiichi , Furusawa Fumio , Matsuhashi Yasusuke
Published: July 2006

As the key compound for the construction of cisoid terpenoids, (2Z ,6Z)-8-benzyloxy-1-chloro-2,6-dimethylocta-2,6-diene was synthesized stereoselectively via the Wittig reaction starting from nerol. The ten-carbon building block was coupled with prenyl or neryl p-tolyl sulfone to afford, after reductive desulfonylation, (Z,Z)-farnesol and (Z,Z,Z) -nerylnerol, respectively.
SHAPE-SELECTIVE CRACKING OF C8-PARAFFINS ON SILANATED H-MORDENITE
Authors: Niwa Miki , Morimoto Shoji , Hattori Tadashi , Murakami Yuichi
Published: July 2006

In the cracking of C8-paraffins mixture, silanated H-mordenite was active for the shape-selective cracking of octane with 2,2,4-trimethylpentane remaining unreacted.
PROTECTION OF THE TRYPTOPHAN INDOLE RING IN PEPTIDE SYNTHESIS. USE OF A NEW DERIVATIVE, Nin-2,2,2-TRICHLOROETHOXYCARBONYLTRYPTOPHAN
Authors: Kiso Yoshiaki , Inai Masatoshi , Kitagawa Kouki , Akita Tadashi
Published: July 2006

The 2,2,2-trichloroethoxycarbonyl (Troc) group attached at the Nin function of tryptophan by acylation with Troc-Cl in the presence of a catalytic amount of tetra-n-butylammonium hydrogensulfate can be quantitatively removed either by cadmium dust in acetic acid or under basic conditions, e.g., hydrazine hydrate and NaOH, but is resistant to strong acidic conditions.
EVIDENCE FOR A SINGLE ELECTRON TRANSFER ACTIVATION IN THE HYDRIDE TRANSFER FROM AN NADH MODEL COMPOUND TO TETRACYANOETHYLENE
Authors: Fukuzumi Shunichi , Kondo Yuji , Tanaka Toshio
Published: July 2006

New evidence for a stepwise mechanism which requires a single electron transfer activation in the hydride transfer from an NADH model compound, 1-benzyl-1,4-dihydronicotinamide (BNAH), to tetracyanoethylene (TCNE) has been presented based on the effects of pyridine on the stoichiometry of the overall reaction, the rate constant, and the kinetic isotope effect.
HYDROGENATION OF 7-METHYLENEBICYCLO[3.3.1]NONAN-3-ONE OVER GROUP VIII METAL CATALYSTS. NOVEL REDUCTIVE CYCLIZATION
Authors: Ishiyama Jun-ichi , Senda Yasuhisa , Imaizumi Shin
Published: July 2006

The products of novel reductive cyclization, 1-adamantanol and 1-methyl-2-oxa-adamantane, were obtained in the hydrogenation of 7-methylenebicyclo[3.3.1]nonan-3-one over group VIII metal black catalysts in ethanol or cyclohexane. 1-Adamantanol was produced over Pd, Rh, Co and Ni catalysts, and 1-methyl-2-oxa-adamantane only over Co catalyst in cyclohexane.
ISOLATION AND ABSOLUTE CONFIGURATION OF A NEW ISOMER OF (1,2-PROPYLENEDIAMINETETRAACETATO)COBALTATE(III) ION, [Co(pdta)]−
Authors: Koine Norio , Tanigaki Teiichi
Published: July 2006

A new isomer of [CoIII(pdta)]−, which has a methyl group in the axial orientation, was prepared and optically resolved. The complex was characterized by spectral behaviors. The absolute configuration was determined on the basis of the circular dichroism spectrum and the equilibrium experiment.
FARFUGINE, A NEW PYRROLIZIDINE ALKALOID ISOLATED FROM FARFUGIUM JAPONICUM KITAM.
Authors: Niwa Haruki , Ishiwata Hiroyuki , Kuroda Akio , Yamada Kiyoyuki
Published: July 2006

A new pyrrolizidine alkaloid, farfugine (1) was isolated from Farfugium japonicum Kitam. and the structure including absolute stereochemistry was elucidated by chemical and spectroscopic evidence.
CARBON–CARBON BOND FORMATION VIA PHOSPHINE-INITIATED CLEAVAGE OF β-OXOSULFIDES
Authors: Ueno Yoshio , Yadav L D S , Okawara Makoto
Published: July 2006

2-(Phenacylthio) benzothiazole (1) reacted with aldehyde or ketone in the presence of tri-n-butylphosphine at 80 °C to give α,β-enone and 2-mercaptobenzothiazole in good yield. The reaction scheme for this new type of enolate ion formation via C–S bond cleavage is also described.
1-ALKENYLATION ON α-POSITION OF KETONE: PALLADIUM-CATALYZED REACTION OF TIN ENOLATES AND 1-BROMO-1-ALKENES
Authors: Kosugi Masanori , Hagiwara Isao , Migita Toshihiko
Published: July 2006

The reaction of tributyltin enolates, prepared from tributyltin methoxide and enol acetates in situ, with 1-bromo-1-alkenes in the presence of a catalytic amount of PdCl2(o-tolyl3P)2 was found to give the derivatives of allyl ketone in good yields.
REACTION MECHANISM OF ONE-POT SYNTHESIS OF POLYCYCLIC QUINONES —DIRECT EVIDENCE OF PHOTO-INDUCED ELECTRON TRANSFER PROCESS
Authors: Maruyama Kazuhiro , Tai Seiji , Otsuki Tetsuo
Published: July 2006

Photo-induced cyclocondensation of 2,3-disubstituted 1,4-naphthoquinone (substituents; halogen atom or methoxy group) with 1,1-diarylethylene provides us a powerful one-pot synthetic method of polycyclic quinones. Involvement of electron transfer process in the photochemical reaction was evidenced unambiguously by means of CIDNP technique.
OXIDATION OF 1-ACYLINDOLES WITH MOLYBDENUM PEROXO COMPLEX (MoO5·HMPA): PREPARATION OF 1-ACYL-trans- AND cis-2,3-DIHYDROXYINDOLINE DERIVATIVES
Authors: Kawasaki Tomomi , Chien Chun-Sheng , Sakamoto Masanori
Published: July 2006

Oxidation of 1-acylindoles with MoO5·HMPA in methanol gave a mixture of 1-acyl-trans- and cis-2,3-dihydroxyindoline derivatives in good yields, while 1-acyl-2-substituted indole was oxidized to a corresponding 2-hydroxyindoxyl.
A CONVENIENT METHOD FOR THE SYNTHESIS OF α, β-UNSATURATED CARBONYL COMPOUNDS
Authors: Mukaiyama Teruaki , Ohsumi Tadashi
Published: July 2006

A variety of α,β-unsaturated ketones are conveniently synthesized from enaminoketones and organolithium compounds especially when the reaction is carried out in petroleum ether; this reaction provides a facile method for the synthesis of α,β,γ-trisubstituted 2-cyclopentenones in combination with the regioselective alkylation of enaminoketones.
THE ROLE OF HYDROGEN BONDING IN THE AUTOXIDATION AND ALKYLATION OF 2-NAPHTHOLS
Authors: Jazzaa Abdulaziz Al , Clark James H , Miller Jack M
Published: July 2006

The powerful hydrogen bond electron donor fluoride ion assists the O-alkylation of 2-naphthols but inhibits the autoxidation of 1-alkyl-2-naphthols. These observations may be explained in terms of the nature of the OHF− hydrogen bond.
NEW SYNTHESIS OF JASMINE LACTONE AND RELATED δ-LACTONES FROM 3-SUBSTITUTED 1,2-CYCLOHEXANEDIONES BY USE OF DYE-SENSITIZED PHOTOOXYGENATION
Authors: Utaka Masanori , Kuriki Hidesuke , Sakai Takashi , Takeda Akira
Published: July 2006

A new synthesis of jasmine lactone and related δ-lactones is described which uses a novel dye-sensitized photooxygenation of 3-(2-alkenyl)- or 3-(2-alkynyl)-1,2-cyclohexanediones as a key step.
A FORMAL TOTAL SYNTHESIS OF VALIDAMYCIN A
Authors: Ogawa Seiichiro , Ogawa Takao , Nose Taisuke , Toyokuni Tatsushi , Iwasawa Yoshikazu , Suami Tetsuo
Published: July 2006

Validamycin A has been prepared by a glycosidation of the partly blocked validoxylamine A, followed by deprotection. Since a racemic form of validoxylamine A has been totally synthesized, the synthesis of validamycin A is achieved by the present study.
A NEW SYNTHETIC METHOD FOR 1-METHOXY-2-ALKANONES FROM 1,2-DIMETHOXYETHENYLLITHIUM AND ORGANOBORANES
Authors: Koshino Junji , Sugawara Takahiro , Yogo Toshinobu , Suzuki Akira
Published: July 2006

1-Methoxy-2-alkanones are prepared from ate-complexes formed from 1,2-dimethoxyethenyllithium and trialkylboranes by the reaction with BF3:Et2O, followed by basic hydrogen peroxide oxidation.
INTRODUCTION OF “SOLUBILIZING GROUP” TO NUCLEOTIDE SYNTHESIS: STANNYL ESTER OF NUCLEOTIDES AS USEFUL INTERMEDIATE IN UNSYMMETRICAL ALKYL NUCLEOSIDE DIPHOSPHATE SYNTHESIS
Authors: Kamimura Takashi , Sekine Mitsuo , Hata Tsujiaki
Published: July 2006

Tributylstannyl ester of 5′-guanylic acid and related compounds enhanced their solubility in pyridine. The stannyl phosphorothioate (5) was employed as synthetic intermediate for alkyl nucleoside diphosphate bond formation.
PRONOUNCED EFFECT OF SULFATE ION ON CATALYTIC ACTIVITY OF ZrO2–SnO2 FOR ISOMERIZATION OF CYCLOPROPANE
Authors: Wang Gong-Wei , Hattori Hideshi , Tanabe Kozo
Published: July 2006

The catalytic activity of ZrO2–SnO2 containing 3 wt% of sulfate ion for the isomerization of cyclopropane has been found to be pronouncedly higher than that of a pure ZrO2–SnO2 and even higher than those of ZrO2 and SnO2 which contain 3 wt% of sulfate ion.
ABSORPTION AND CIRCULAR DICHROISM SPECTRA OF BIS(ETHYLENEDIAMINE) COBALT(III) COMPLEXES WITH 2-AMINOETHANESULFENIC OR 2-AMINOETHANESELENENIC ACID
Authors: Konno Takumi , Okamoto Ken-ichi , Einaga Hisahiko , Hidaka Jinsai
Published: July 2006

Optically active title complexes derived from [Co(aese or seea)(en)2]2+ (aese=2-aminoethanesulfenato and seea=2-aminoethaneselenenato) were obtained and their CD spectra were discussed in relation to the absolute configuration of the coordinated chalcogen atom. The Hseea isomer derived from the Λ(R) seea one exhibited the inversion on the chiral selenium atom.
THE PHOTOLYSIS OF N,O-DIACYL-N-PHENYLHYDROXYLAMINES
Authors: Sakurai Tadamitsu , Yamada Shuichi , Inoue Hiroyasu
Published: July 2006

The photodecomposition of the title compounds yielded the rearrangement products derived from 1,3- and 1,5-aroyloxy migrations in addition to the fragmentation products typical of the aroyloxyl and amido free radicals. Crossover experiments indicate an intramolecular rearrangement, probably involving homolysis of the N–O bond. Sensitization and quenching studies demonstrate that the rearrangement and fragmentation proceed via the excited singlet state.
THE EFFECTS OF OXYGEN TREATMENT ON THE CO–H2 REACTION OVER VARIOUS PALLADIUM CATALYSTS SUPPORTED ON TiO2 AND ZrO2
Authors: Yoshioka Hiroshi , Naito Shuichi , Tamaru Kenzi
Published: July 2006

The effects of oxygen pretreatment on the activity and selectivity of CO–H2 reaction over sodium-doped and none-doped palladium catalysts supported on TiO2 and ZrO2 have been investigated. Large enhancement effect of methanol and C2 hydrocarbon product formations was observed after the oxygen treatment followed by low temperature reduction.
REGIOSELECTIVE SYNTHESIS OF 1-OLEFINS BY PALLADIUM-CATALYZED HYDROGENOLYSIS OF TERMINAL ALLYLIC COMPOUNDS WITH AMMONIUM FORMATE
Authors: Tsuji Jiro , Shimizu Isao , Minami Ichiro
Published: July 2006

Various terminal allylic compounds such as allylic esters, phenyl ethers, carbonates, chlorides, and vinyl epoxides react with ammonium or sodium formate to give 1-olefins with high regioselectivity by using palladium–tributylphosphine complex as a catalyst. The reaction offers a useful synthetic method for 1-olefins.
TRANSFORMATION OF ARTEMISIN INTO YOMOGIN AND 1-DEOXYIVANGUSTIN
Authors: Arnó Manuel , Carda Miguel , Marco J Alberto , Seoane Eliseo
Published: July 2006

Partial syntheses of the sesquiterpene lactones yomogin and 1-deoxyivangustin from artemisin are disclosed.
A CONVENIENT METHOD FOR CRYSTALLIZATION OF ZEOLITE ZSM-5 BY USING SEED CRYSTALS IN ACETONE/WATER MIXTURE SYSTEM
Authors: Narita Eiichi , Sato Keiichi , Okabe Taijiro
Published: July 2006

Zeolite ZSM-5 was easily synthesized by using ZSM-5 seed crystals as crystallization nuclei from acetone/water mixture system without any organic templates. A small amount of acetone in a reaction mixture inhibited formation of α-quartz and facilitated rapid crystallization of ZSM-5 under the mild hydrothermal conditions of 170–190 °C.