bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOINDUCED ELECTRON TRANSPORT ACROSS LIPOSOMAL MEMBRANE USING CHLOROPHYLLIN A
Authors: Hidaka Seiji , Toda Fujio
Published: July 2006

Photoinduced electron transport across the bilayer lipid membrane of liposome was studied by using chlorophyllin a, a water-soluble chlorophyll derivative, without an electron carrier. The reduction of ferricyanide by sodium ascorbate was observed on irradiation with visible light under anaerobic condition.
COOPERATIVE SENSITIZATION IN PHOTOREDUCTION OF VIOLOGENS BY METAL COMPLEXES AND CHARGE-TRANSFER COMPLEXES ON AMPHIPATHIC VIOLOGEN MICELLES
Authors: Nagamura Toshihiko , Takeyama Naoki , Matsuo Taku
Published: July 2006

Amphipathic viologens having alkyl chain with a naphthyloxy group formed micelles and showed charge-transfer (CT) absorption. The quantum yield of photoreduction of viologens sensitized by metal complex in these micelles was about twice of the sum of those sensitized by metal complex in micelle without CT and by CT-complex alone. These results strongly indicated the cooperative action between CT- and metal complexes.
INTENTIONAL SYNTHESES OF UTAHIN, A CONIFER CONSTITUENT OF A C20-DITROPONOFURAN, VIA THE OXIDATIVE CONDENSATION
Authors: Takeshita Hitoshi , Kusaba Tomoyuki , Mori Akira
Published: July 2006

Utahin, previously characterized as a constituent of Juniperus utahensis, has been prepared by a biomimetic oxidation of hinokitiol in addition to the coupling reactions of 4-isopropyl-p-tropoquinone with 5-hydroxyhinokitiol.
SYNTHETIC APPROACH TOWARD MITOMYCINS. SYNTHESIS OF 9-BENZYLOXYMETHYL-5-METHOXY-4-METHYL-3H-PYRROLO[1,2-a]INDOL-4,5-DIONE
Authors: Naruta Yoshinori , Nagai Naoshi , Maruyama Kazuhiro
Published: July 2006

2-Azido-3-(1′-benzyloxymethyl-2′,4′-pentadienyl)-5-methoxy-6-methyl-1,4-benzoquinone is prepared and its thermal decomposition under the presence of Cu(acac)2 affords the corresponding 3H-pyrrolo[1,2-a]indol-5,8-dione, which is the important precursor for mitomycin synthesis.
AN IMPROVED METHOD TO PREPARE CATALYSTS FOR THE SELECTIVE DECARBONYLATION OF FURAN-2 CARBOXALDEHYDE INTO FURAN
Authors: Lejemble Philippe , Maire Yolande , Gaset Antoine , Kalck Philippe
Published: July 2006

We are able to produce pure furan and pure carbon monoxide from furan-2 carboxaldehyde using an improved catalyst. This new catalyst (Pd/C–K2CO3) is activated by UV irradiation at 254 nm for 1 h.
SEPARATION OF MOLYBDENUM(VI) AND VANADIUM(V) BY USE OF POLYSTYRENE RESINS WITH A FUNCTIONAL GROUP HAVING BIS(2-HYDROXYETHYL)AMINO AND BIS(PHOSPHONOMETHYL)AMINO MOIETY
Authors: Nishizawa Masato , Yokoyama Toshiro , Kimura Tetsuo , Suzuki Toshishige M
Published: July 2006

Styrene–divinylbenzene copolymers containing bis(2-hydroxyethyl)amino and bis(phosphonomethyl)amino moiety have been synthesized and applied to the recovery of molybdenum(VI) and/or vanadium(V) from aqueous solution. The former resin is particularly effective for the separation of molybdenum(VI) and vanadium(V) by the column method owing to its high adsorption capacity and rapid exchange.
THIENOAZATROPONE: SYNTHESIS OF 7-CHLORO-8H-THIENO[3,2-c]AZEPIN-8-ONE
Authors: Satake Kyosuke , Kimura Masaru , Morosawa Shiro
Published: July 2006

A thienoazatropone, 7-chloro-8H-thieno[3,2-c]azepin-8-one(5) is synthesized from 4,5-dihydro-8H-thieno[3,2-c]azepin-8-one(2) using t-butyl hypochlorite. In addition, some physical properties of 5 are disscussed.
SYNTHESIS AND ELECTRONIC PROPERTIES OF THE NEUTRAL η3-PHENALENYL PALLADIUM ACETYLACETONATE COMPLEX1)
Authors: Nakasuji Kazuhiro , Yamaguchi Masakazu , Murata Ichiro , Tatsumi Kazuyuki , Nakamura Akira
Published: July 2006

The first neutral η3-phenalenyl acetylacetonate complex has been synthesized from the reaction of [Pd(phenalenyl)Cl]2 with thallous acetylacetonate and its structure and electronic properties are discussed.
BIOSYNTHESIS OF CYCLIC MONOTERPENOIDS. THE PIVOTAL ACYCLIC PRECURSOR FOR THE CYCLIZATION LEADING TO THE FORMATION OF α-TERPINEOL AND LIMONENE IN MENTHA SPICATA AND CITRUS NATSUDAIDAI
Authors: Suga Takayuki , Hirata Toshifumi , Okita Hitoshi , Tsuji Kazunori
Published: July 2006

As a result of making a direct comparison among the incorporations of the pairs of 14C- and 3H-labeled linalyl, geranyl, and neryl pyrophosphates into α-terpineol and limonene in the cell-free extract of Mentha spicata and Citrus natsudaidai, respectively, the linalyl pyrophosphate was found to be the most pivotal, immediate precursor for the cyclization leading to the formation of the cyclic monoterpenoids.
GENERAL TRIPLE RESONANCE OF DIPHENYL NITROXIDE
Authors: Deguchi Yasuo , Okada Keiichi , Yamauchi Jim , Fujii Kanae
Published: July 2006

General triple resonance spectra of diphenyl nitroxide have been observed in ethylbenzene at −90 °C by means of the ENDOR spectrometer with a TM110 mode cavity. The signal intensity was greatly influenced by the pumping frequency set on each of the ENDOR lines. The results indicate that two hyperfine couplings of the meta and para or ortho positions have opposite signs.
SELECTIVE HYDROGENATION OF ACROLEIN TO ALLYL ALCOHOL CATALYZED BY RANEY-TYPE SILVER–ZINC CATALYST
Authors: Nagase Yoshinori , Hattori Hideshi , Tanabe Kozo
Published: July 2006

A Raney-type silver-zinc (1:1 wt. ratio) catalyst was found to exhibit a high activity and selectivity for the hydrogenation of acrolein to allyl alcohol, 70% conversion and 90% selectivity being observed in 90 min at 120 °C. Addition of small amount of Fe3+ to the catalyst resulted in an increase in the selectivity to 95% with a slight decrease in activity.
KUMAUSALLENE, A NEW BROMOALLENE FROM THE MARINE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Suzuki Teruaki , Koizumi Kuniko , Suzuki Minoru , Kurosawa Etsuro
Published: July 2006

Kumausallene, a new C15-bromoallene has been isolated from the title alga, and its structure was established on the basis of the spectral properties and chemical degradation.
NOVEL TYPE OF TRANSFORMATIONS OF α-AZIDOSTYRENE DERIVATIVES AND 3-ARYL-2H-AZIRINES IN THE PRESENCE OF HEXACARBONYLMOLYBDENUM
Authors: Nitta Makoto , Kobayashi Tomoshige
Published: July 2006

The reaction of α-azidostyrene derivatives with hexacarbonylmolybdenum was found to give 2,5-diarylpyrroles and acetophenone derivatives via a complexed 1-arylvinylnitrene intermediate, while that of 3-aryl-2H-azirines gave 2,4-diarylpyrroles in addition to acetophenone derivatives and 2,5-diarylpyrazines.
SYNTHESIS OF AZULENO[1,2-b]- AND AZULENO[1,2-c]THIOPHENES BY THE REACTIONS OF 2H-CYCLOHEPTA[b]FURAN-2-ONES WITH ENAMINES OF 3-OXOTETRAHYDROTHIOPHENES
Authors: Fujimori Kunihide , Fujita Takefumi , Yamane Kameji , Yasunami Masafumi , Takase Kahei
Published: July 2006

New heterocyclic compounds, azuleno[1,2-b]- and azuleno[1,2-c]thiophene, are synthesized by the reaction of 3-methoxycarbonyl-2H-cyclohepta[b]furan-2-one with morpholino enamines of 3-oxotetrahydrothiophene, followed by dehydrogenation of resulting dihydrocompounds with 2,3-dichloro-5,6-dicyano-p-benzoquinone.
OXIDATIVE ADDITION OF ALLYL-CHALCOGEN (O, S, Se) BONDS TO PALLADIUM(0). ISOLATION OF THE OXIDATIVE ADDITION PRODUCTS
Authors: Yamamoto Takakazu , Akimoto Mitsuru , Yamamoto Akio
Published: July 2006

Allyl phenyl ether reacts with Pd(PCy3)2 to yield an oxidative addition product, Pd(η-C3H5)(OPh)(PCy3), with formation of a phosphonium salt. Allyl phenyl sulfide and selenide oxidatively add to Pd(PCy3)2 to give binuclear complexes, Pd2(μ-C3H5)(μ-ZPh)(PCy3)2 (Z = S, Se). Allyl alcohol undergoes dehydration reaction on interaction with Pd(PCy3)2 to give Pd(1-2:6-7-η-diallyl ether)(PCy3).
THE STEREOSELECTIVE SYNTHESIS OF 2,3-CIS-DIHYDROXY-γ-BUTYROLACTONES BY THE OXIDATION OF γ-BUTENOLIDES WITH KMnO4-CROWN ETHER
Authors: Mukaiyama Teruaki , Tabusa Fujio , Suzuki Keisuke
Published: July 2006

Oxidation of γ-butenolides was effected by KMnO4-crown ether to afford the corresponding 2,3-cis-dihydroxy-γ-butyrolactones in high yields. High stereoselectivity was observed in cases when bulky substituents were introduced at the γ-position of the butenolides.
ELECTROCATALYTIC REDUCTION OF OXYGEN ON COBALT-DOPED POLYPYRROLE FILMS
Authors: Ikeda Osamu , Okabayashi Katsuaki , Tamura Hideo
Published: July 2006

A polypyrrole film electrochemically deposited on metal electrodes from an acetonitrile solution containing pyrrole, cobalt(II) acetate, and lithium perchlorate shows the electrocatalytic activity for oxygen reduction. It is found that this polymer film contains cobalt species in the polymer structure.
PHOTOACOUSTIC OBSERVATION OF SOLID–LIQUID INTERFACE BY MEANS OF TOTAL INTERNAL REFLECTION TECHNIQUE
Authors: Hinoue Teruo , Shimahara Yutaka , Yokoyama Yu
Published: July 2006

Photoacoustic signal induced in a thin region on the solution side at a glass-dye solution interface was measured by changing an angle of incidence. It was contemplated that the method could be extended to observation within the effective thickness as small as 100 nm and on the solution of as low concentration as 10−5 in absorbance.
ASYMMETRICAL REDUCTION OF PERFLUOROALKYLATED KETONES, KETOESTERS AND VINYL COMPOUNDS WITH BAKER’S YEAST
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

Reduction of perfluoroalkylated ketones, ketoesters and vinyl compounds with baker’s yeast was studied. The ketones and β-ketoesters were asymmetrically reduced to give optically active perfluoroalkylated carbinols and hydroxyesters, while the vinyl compounds were reduced to perfluoroalkylated alkanes.
3-BENZYLIDENE-2,4-BIS(TRIMETHYLSILYLOXY)-1,4-PENTADIENE; SYNTHESIS AND ITS DIENE-TRANSMISSIVE DIELS–ALDER REACTION
Authors: Tsuge Otohiko , Wada Eiji , Kanemasa Shuji
Published: July 2006

A novel cross-conjugated triene, 3-benzylidene-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, was synthesized and the multiple Diels–Alder cycloaddition reactions to acetylenic dienophiles leading to the dihydronaphthols were demonstrated.
FACILE AND EFFICIENT SYNTHESIS OF ALKYL THIOTOSYLATES USING ANION EXCHANGE RESIN
Authors: Takano Seiichi , Hiroya Kou , Ogasawara Kunio
Published: July 2006

Facile and efficient synthesis of alkyl thiotosylates (1a–h) has been developed using anion exchange resin.
14N ENDOR OF DI-t-BUTYL NITROXIDE
Authors: Yamauchi Jun , Deguchi Yasuo
Published: July 2006

ENDOR spectra of di-t-butyl nitroxide have been observed at −104°C in heptane and two ENDOR lines only due to 14N nucleus have been detected. The observed intensity indicates that cross relaxation is an important means of spin relaxation as has been revealed in some alicyclic nitroxide radicals.
FACILE PHOTOGENERATION OF COORDINATTVELY UNSATURATED ACTIVE SPECIES FROM A HYDRIDOPHOSPHONITECOBALT(I) COMPLEX AND ITS APPLICATION TO DOUBLE-BOND MIGRATION OF OLEFIN
Authors: Onishi Masayoshi , Hiraki Katsuma , Matsuda Masahiko , Fukunaga Tetsuo
Published: July 2006

Pyrex-filtered irradiation of a thermally inert complex [CoH[PPh(OMe)2]4] dissociated PPh(OMe)2 from cobalt without cleavage of a hydrido–cobalt bond, yielding an active species “CoH[PPh(OMe)2]3”. The photogenerated species caused double-bond migration of 3-phenylpropene to (E)- and (Z)-1-phenylpropenes.
HIGHLY ENANTIOSELECTIVE ALDOL-TYPE REACTION OF 3-ACETYLTHIAZOLIDINE-2-THIONE WITH ACHIRAL ALDEHYDES
Authors: Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

A highly enantioselective aldol-type reaction forming various β-hydroxy carbonyl compounds from 3-acetylthiazolidine-2-thione and achiral aldehydes is achieved via divalent tin enolate employing chiral diamine derived from (S)-proline as a ligand.
SELECTIVITIES OF GROUP VIII METALS FOR THE HYDROGENATION OF FORMALDEHYDE AND THE EFFECT OF SUPPORT AND PROMOTER
Authors: Aika Ken-ich , Sekiya Harutaka , Ozaki Atsumu
Published: July 2006

The reaction of HCHO over group VIII metals was studied. The main products obtained with powder catalysts were CO and CH3OH, while CH4 was formed at higher temperatures. The CH3OH selectivity of the powder catalysts correlated well with the heat of formation of oxide. Although the SiO2 support did not affect the CH3OH selectivity of the metal, ZnO and Cs2O improved it remarkably. Cu–Zn–Al catalysts are quite active for CH3OH formation.
THE HIGHLY STEREOSELECTIVE SYNTHESIS OF PERBENZYLATED α,α-TREHALOSE AND ITS d-GALACTO AND d-MANNO ANALOGS
Authors: Yoshimura Juji , Hara Kazutoshi , Sato Tatsuya , Hashimoto Hironobu
Published: July 2006

Treatment of 2,3,4,6-tetra-o-benzyl-1-o-trimethylsilyl-α,β-d-glucopyranose in dichloromethane with trimethylsilyl triflate catalyst gave the corresponding α,α- and α,β-trehaloses in quantitative yield. A similar treatment of d-galacto and d-manno analogs gave exclusively the corresponding α,α-anomers, respectively.
COLLISIONAL RELAXATION OF H2CS (\ ildeA1A2, V4′=1)
Authors: Kawasaki Masahiro , Kasatani Kazuo , Uchida Toyohisa , Sato Hiroyasu
Published: July 2006

Fluorescence spectra of single vibronic levels of the first excited singlet state of H2CS have been measured under effusive flow conditions as a function of pressure. Weak non-resonance bands grow in with increasing pressure, demonstrating the existence of collisional vibrational relaxation of the 41 level to the 40 level.
THE PRESENCE OF OLIGOMERIC AROMATIC STRUCTURES IN POLYAROMATICS AND POLAR MATERIALS FROM COAL-DERIVED HEXANE SOLUBLES
Authors: Nomura Masakatsu , Kurosaki Takayuki , Miyake Mikio
Published: July 2006

Polyaromatics and polar materials of coal-derived hexane soluble were separated according to molecular size. UV spectra combined with their mass spectra revealed that the high-molecular-weight fractions consist of oligomer structures such as small aromatic units joining by methylene bridges and/or biaryl bonds.
FORMATION OF 1-NITRO-2-HYDROXYPYRENE FROM 1-NITROPYRENE BY PHOTOLYSIS
Authors: Yasuhara Akio , Fuwa Keiichiro
Published: July 2006

1-Nitropyrene was converted by photolysis to a new compound, deep red needles, which was identified to be 1-nitro-2-hydroxypyrene.
SELECTIVE HYDROXYLATION OF THYMINE BY 2,2,6,6-TETRAMETHYL PIPERIDINE-1-OXYL BROMIDE IN AQUEOUS SOLUTION
Authors: Kagiya Tsutomu , Komuro Chikara , Sakano Koichi , Nishimoto Sei-ichi
Published: July 2006

2,2,6,6-Tetramethylpiperidine-1-oxyl bromide (TMPO+Br−) was found to mediate selectively the hydroxylation of thymine by water into thymine glycol at room temperature. Almost quantitative yield of thymine glycol was obtained at the molar ratio of [TMPO+Br−]0/[Thymine]0 = 2 in feed under neutral conditions. The reaction mixture showed the ESR spectrum characteristic of 2,2,6,6-tetramethylpiperidine-1-oxyl (TMPO·).
1H NMR STUDY OF THE LIGAND EXCHANGE REACTION IN TETRAKIS(2,4-PENTANEDIONATO)THORIUM(IV)
Authors: Fujiwara Naoshi , Tomiyasu Hiroshi , Fukutomi Hiroshi
Published: July 2006

The rate of ligand exchange in tetrakis(2,4-pentanedionato)thorium(IV) was first measured by the 1H NMR line-shape analysis. The observed first-order rate constant is proportional to the concentration of free 2,4-pentanedione in enol form and the exchange is retarded by the addition of bases such as dimethyl sulfoxide and N,N-dimethylformamide.
STEREOSELECTIVE HYDROLYSIS OF ENANTIOMERIC AMINO ACID ESTERS CATALYZED BY PENTAAMMINE-l-HISTIDINERUTHENIUM(III) AND ANIONIC SURFACTANTS
Authors: Sakaki Shigeyoshi , Nakano Yoshifumi , Ohkubo Katsutoshi
Published: July 2006

Stereoselective hydrolysis of enantiomeric N-acyl-l(or d)-phenylalanine p-nitrophenyl ester, H–(CH2)n−1CONHCH(CH2Ph)CO2C6H4–NO2-p (n=2, 10, or 16), was carried out with pentaammine-l-histidineruthenium(III) and anionic surfactants. The highest selectivity of 4.2 was obtained for n=10, by using bilayer membranes, di-2-ethylhexyl sodium sulfosuccinate.
ELECTROLYTIC PRODUCTION OF PHENOLS FROM BENZENE USING Cu(I)/Cu(II) COUPLE
Authors: Sasaki Kazuo , Ito Sotaro , Kinoshita Tatsuyuki , Harada Junji
Published: July 2006

Phenol can be produced continuously from benzene by aerial oxidation in an aqueous sulfuric acid when Cu(I)/Cu(II) couple is used as a current mediator. Experimental conditions to optimize the phenol production are discussed.
CHARACTERIZATION OF MONO- AND OLIGOSACCHARIDES PRODUCED BY CO2 LASER IRRADIATION ON CELLULOSE
Authors: Suzuki Jun , Azuma Jun-ichi , Koshijima Tetsuo , Okamura Keizo , Okamoto Hajime
Published: July 2006

The chemical structures of three mono-, two di-, and two trisaccharides (1∼7) isolated from the pyrolysis products formed by CO2 laser irradiation on cellulose were investigated.
AN INHIBITORY EFFECT OF Mg2+ ION BY THE COMPLEX FORMATION WITH 1-BENZYL-1,4-DIHYDRONICOTINAMIDE ON THE REDUCTION OF 7,7,8,8-TETRACYANO-p-QUINODIMETHAN
Authors: Fukuzumi Shunichi , Kondo Yuji , Tanaka Toshio
Published: July 2006

A 1 : 1 complex formed between 1-benzyl-1,4-dihydronicotinamide (BNAH) and Mg2+ ion with the formation constant (1.2±0.1) ×104 mol−1 dm3 at 298 K causes the 23 fold decrease in the rate constant for the reduction of 7,7,8,8-tetracyano-p-quinodimethan by BNAH.
REACTION OF PYRIDINIUM PHENACYLIDES AND RELATED YLIDES WITH CYCLOPENTADIENONE DERIVATIVES
Authors: Yamashita Yoshiro , Miyauchi Yukio , Masumura Mitsuo
Published: July 2006

Reaction of pyridinium phenacylides with cyclopentadienone derivatives gave bicyclo[3.1.0]hex-3-en-2-one derivatives by the nucleophilic addition reaction followed by pyridine elimination. Isoquinolinium phenacylide underwent the 1,3-dipolar cycloaddition reaction with a cyclopentadienone.
MECHANISM OF THE PHOTOINDUCED REARRANGEMENT OF 5α-ANDROSTAN-17β-OL HYPOIODITE TO 13α- AND 13β-FORMYLOXY-16-IODO-13,16-SECO-d-NOR-5α-ANDROSTANE IN THE PRESENCE OF HgO AND I2—AN 18O LABELING STUDY
Authors: Suginome Hiroshi , Yamada Shinji , Miyaura Norio
Published: July 2006

An 18O labeling study indicates that the title rearrangement involves a novel intramolecular combination between a carbonyl oxygen and a carbon radical which are generated by a β-scission of an oxyl radical.
FORMATION OF α-TRICHLOROSTANNYL KETONES IN THE REACTION OF STANNIC CHLORIDE WITH ENOL SILYL ETHERS
Authors: Nakamura Eiichi , Kuwajima Isao
Published: July 2006

The enol silyl ethers of ketones reacted with SnCl4 to give α-trichlorostannyl ketones in moderate to good yields, and their structures were determined by chemical and spectral means. The reaction mechanism is also discussed.
COMPLEX FORMATION OF WATER-SOLUBLE PORPHYRIN WITH CYCLODEXTRIN
Authors: Hirai Hidefumi , Toshima Naoki , Hayashi Shinji , Fujii Yasufumi
Published: July 2006

Interactions of monomer forms of protoporphyrin IX, deuteroporphyrin IX, hematoporphyrin IX, and coproporphyrin III, respectively, with α- and γ-cyclodextrin in 0.002 mol·dm−3 NaOH aqueous solution are indicated by change of electronic spectrum and induction of circular dichroism. Dimerization constant of porphyrin and complex formation constant of porphyrin with cyclodextrin are also determined from the electronic spectra.
DEHYDROGENATION OF HYDROGEN MOLYBDENUM BRONZE, H0.3MoO3
Authors: Sotani Noriyuki , Kunitomo Masakazu , Hasegawa Masatomo
Published: July 2006

Hydrogen molybdenum bronze, H0.3MoO3, is decomposed through two processes on vacuum heating with evolution of H2O. One is the low-temperature process without structural change. The other is the high-temperature process with structural change from the bronze to MoO3* which is a non-stoichiometric MoO3 structure.
ISOLATION AND STRUCTURES OF HELIOSCOPINOLIDES, NEW DITERPENES FROM EUPHORBIA HELIOSCOPIA L.
Authors: Shizuri Yoshikazu , Kosemura Seiji , Yamamura Shosuke , Ohba Shigeru , Ito Masatoki , Saito Yoshihiko
Published: July 2006

Three new diterpenes, helioscopinolides A, B and C, have been isolated from the plant Euphorbia helioscopia L., and their stereostructures also been elucidated on the basis of their spectral and chemical data coupled with an X-ray crystallographic analysis of helioscopinolide A.
STEREOSELECTIVE SYNTHESIS OF l-DAUNOSAMINE
Authors: Mukaiyama Teruaki , Goto Yukihisa , Shoda Shin-ichiro
Published: July 2006

l-Daunosamine was conveniently synthesized from β-amino amide 1 obtained by the stereoselective addition of α-lithio N,N-dimethylacetamide to the imine of 2,3-O-cyclohexylidene-4-deoxy-l-threose in the presennce of zinc halide.
A FACILE SYNTHESIS OF CARBOXYLIC ESTERS AND CARBOXAMIDES BY THE USE OF 1,1′-DIMETHYLSTANNOCENE AS A CONDENSING REAGENT
Authors: Mukaiyama Teruaki , Ichikawa Junji , Asami Masatoshi
Published: July 2006

Various carboxylic esters or carboxamides are prepared in good yields under nearly neutral conditions from equimolar amounts of free carboxylic acids and alcohols or amines, respectively, by the use of 1,1′-dimethylstannocene as a condensing reagent.
CYCLIZATION MECHANISM OF TRANS-β-MONOCYCLOHOMOFARNESIC ACID AND RELATED COMPOUNDS
Authors: Saito Akira , Matsushita Hajime , Kaneko Hajime
Published: July 2006

Cyclization of trans-β-monocyclohomofarnesic acid and the related compounds was closely examined in order to elucidate the reaction mechanism. It was revealed that the cyclization of trans-β-monocyclohomofarnesic acid proceeds via formation of the cationic intermediate followed by concerted lactonization to give trans-anti-trans norambreinolide stereoselectively.
DISTINCT OBSERVATION OF TWO CONFORMERS OF 7-CYANOCYCLOHEPTATRIENES CONTAINING A t-BUTYL GROUP AT 2- OR 3-POSITION: AN APPROACH TO VALID INTERPRETATION OF NMR SPECTRA OF CYCLOHEPTATRIENE DERIVATIVES
Authors: Takeuchi Ken’ichi , Kitagawa Toshikazu , Senzaki Yoshihide , Okamoto Kunio
Published: July 2006

Introduction of a t-butyl group to the 2- or 3-position of 7-cyanocycloheptatriene facilitates the observation of the two conformers by 1H and 13C NMR at low temperatures. The chemical shift of equatorial H(7) and the equilibrium constant for the ring inversion with respect to 7-cyanocycloheptatriene have been reexamined and corrected.
FUNCTIONAL FLUOROCARBON MICELLES. PHASE SEPARATION AND REACTIVITY CHANGE OF HYDROXAMATE NUCLEOPHILES IN MIXED MICELLES OF HYDROCARBON AND FLUOROCARBON SURFACTANTS
Authors: Ihara Hirotaka , Hashiguchi Yuichi , Kunitake Toyoki
Published: July 2006

The titration behavior of long-chain(hydrocarbon and fluorocarbon) hydroxamic acids in the presence and absence of micellar matrices is influenced by phase separation of hydrocarbon and fluorocarbon species. The same factors operate in the hydrolysis of phenyl esters.
CHEMICAL BEHAVIOR AND PROPERTIES OF TETRAHYDROPYRROLO[3,2-b]PYRROLE
Authors: Satake Kyosuke , Kumagai Tsutomu , Mukai Toshio
Published: July 2006

Upon treating under basic or acidic conditions, tetrahydropyrrolo[3,2-b]pyrrole derivative 3 easily undergoes demethoxycarbonylation or ring-opening reactions affording bicyclic diimine 5 or pyrrole derivatives such as 10 and 12. In addition, dehydrogenation of 3 results in the formation of dihydropyrrolo[3,2-b]pyrrole derivative 13, which shows [4+2] cycloaddition reaction with dimethyl acetylene dicarboxylate to give indole derivative 15.
EFFECT OF ADDED ALKALI SALTS ON THE ACTIVITIES OF SUPPORTED VANADIUM OXIDE CATALYSTS FOR NITRIC OXIDE REDUCTION
Authors: Shikada Tsutomu , Fujimoto Kaoru
Published: July 2006

It was found that the activities of supported vanadium oxide catalysts for nitric oxide reduction with ammonia were promoted by the addition of sodium or lithium salts while they were suppressed by added potassium salts.
NOVEL AND CONVENIENT METHODS FOR THE PREPARATION OF SUBSTITUTED THIOPHENES, THIAZOLES, AND 1,3,4-THIADIAZOLE-2(3H)-THIONES FROM BIFUNCTIONAL SUBSTRATES
Authors: Thomsen I , Pedersen U , Rasmussen P B , Yde B , Andersen T P , Lawesson S-O
Published: July 2006

The reactions of LR (Lawesson’s Reagent) with 4-oxocarboxylic acid derivatives I, N-acyl aminoacid derivatives III, and N-acyl-N′-ethoxycarbonylhydrazines V, smoothly produce substituted thiophenes II, thiazoles IV, and 1,3,4-thiadiazole-2(3H)-thiones VI.
THE FORMATION OF HYDROXYLAMINE BY INSERTION OF THE NH(1Δ) RADICAL INTO THE O–H BOND OF WATER
Authors: Kawai Jun , Tsunashima Shigeru , Sato Shin
Published: July 2006

The photolysis of hydrogen azide was examined in water. The main products were nitrogen and hydroxylamine. Hydroxylamine formed was converted into acetoxime by the reaction with acetone which was added after irradiation. The amount of acetoxime was analyzed with GLC. The results suggest that the NH(1Δ) radical efficiently inserts into the O–H bond of water.
CHEMOSELECTIVE REDUCTION OF CARBOXYLIC ACIDS INTO ALCOHOLS USING N,N-DIMETHYLCHLOROMETHYLENIMINIUM CHLORIDE AND SODIUM BOROHYDRIDE
Authors: Fujisawa Tamotsu , Mori Toshiki , Sato Toshio
Published: July 2006

A new method for the direct conversion of carboxylic acids to alcohols using N,N-dimethylchloroimethyleniminium chloride and sodium borohydride was established. This method fulfills the chemoselective reduction of carboxylic acids with a functional moiety such as halide, ester, nitrile, and olefin.
TEMPERATURE-DEPENDENCY OF DIASTEREOSELECTIVITY IN THE ALDOL REACTION OF TRIBUTYLSTANNYL ENOLATES WITH BENZALDEHYDE
Authors: Kobayashi Kazuko , Kawanisi Mituyosi , Hitomi Torazô , Kozima Sinpei
Published: July 2006

At −50°C the O-stannyl enolate reacts with benzaldehyde more quickly than the corresponding C-stannyl derivative to give predominantly threo adduct, which slowly isomerizes into the erythro isomer on warming the reaction products. At r.t. the stannyl enolate reacts rapidly to yield the erythro product.
UNEQUIVOCAL SYNTHESIS OF PHENACYLIDENEANILINE FROM SILYL ENOL ETHERS AND NITROSOBENZENE AND ONE-POT CYCLOADDITION REACTIONS OF THE RELATED ANILS
Authors: Sasaki Tadashi , Ishibashi Yukio , Ohno Masatomi
Published: July 2006

Phenacylideneaniline was formed by Et3N-catalyzed elimination reaction of the hydroxylamine obtained from silyl enol ether 5a and nitrosobenzene (6). By this method, one-pot procedure was possible for cycloaddition reactions of the related anils. From these reactions, it was revealed that 6 reacted efficiently with a silyl enol ether having a π-donating substituent.
TOTAL SYNTHESIS OF (±)-AVENACIOLIDE VIA THE β-VINYLBUTENOLIDE ANNULATION
Authors: Kido Fusao , Tooyama Youichi , Noda Yoshihiro , Yoshikoshi Akira
Published: July 2006

Annulation reaction of α-formylcaprylate (5) with 2,5-dihydro-3-phenylthio-4-vinylfuran-2-one (2), followed by dehydration, oxidation, and rearrangement, provided an epimeric mixture of 2,4,5,6-tetrahydro-6-hexyl-4-hydroxy-6-methoxycarbonylbenzofuran-2-ones (8a and 8b). From both the products, 2,3,3aβ,4,6,6aβ-hexahydro-4β-octylfuro [2,3-c] furan-2,6-dione (4b), the known synthetic precursor of (±)-avenaciolide (1) was obtained.
PREPARATION OF OPTICALLY ACTIVE PHOSPHINE OXIDES BY REGIOSELECTIVE CLEAVAGE OF CYCLIC PHENYLPHOSPHONITE WITH ALKYL HALIDES
Authors: Segi Masahito , Nakamura Yoshiyuki , Nakajima Tadashi , Suga Sohei
Published: July 2006

The Arbuzov reaction of (2S,4S)-4-methyl-2-phenyl-1,3,2-dioxaphosphorinane with various alkyl halides gave the diastereomerically pure phosphinates with regioselective cleavage of the primary carbon–oxygen bond. These phosphinates reacted with Grignard reagents to give optically active phosphine oxides in high optical yields.
INTRA- AND EXTRADIOL OXYGENATIONS OF 3,5-DI-TERT-BUTYLCATECHOL CATALYZED BY BIPYRIDINEPYRIDINEIRON(III) COMPLEX
Authors: Funabiki Takuzo , Mizoguchi Akira , Sugimoto Tsunemi , Yoshida Satohiro
Published: July 2006

Iron(III) complex coordinated by 2,2′-bipyridine and pyridine catalyzes oxygenation of 3,5-di-t-butylcatechol with molecular oxygen to give intra- and extradiol fission products as well as oxidation to give 3,5-di-t-butyl-1,2-benzoquinone. Structures and reactivities of the products have indicated that the oxygenation proceeds by the Hamilton process rather than the dioxetane process.
STRUCTURE OF TRICHODERMAOL, ANTIBACTERIAL SUBSTANCE PRODUCED IN COMBINED CULTURE OF TRICHODERMA SP. WITH FUSARIUM OXYSPORUM OR FUSARIUM SOLANI
Authors: Adachi Takuo , Aoki Hiroo , Osawa Toshihiko , Namiki Mitsuo , Yamane Takashi , Ashida Tamaichi
Published: July 2006

Trichodermaol, an antibacterial substance was isolated from the combined culture of Trichoderma sp. with Fusarium oxysporum or Fusarium solani and the structure was determined by spectroscopic and X-ray crystallographic analyses.
STEREOSELECTIVE SYNTHESIS OF 1,2-CIS-GLYCOFURANOSIDES USING GLYCOFURANOSYL FLUORIDES
Authors: Mukaiyama Teruaki , Hashimoto Yukihiko , Shoda Shin-ichiro
Published: July 2006

1,2-cis-Ribofuranosides are stereoselectively synthesized in high yields by the reaction of β-ribofuranosyl fluoride and alcohols in the presence of stannous chloride and trityl perchlorate. Under similar condition, α-arabinofuranosyl fluoride reacts with cholestanol to give 1,2-cis-arabinofuranoside predominatly.
9,10-DICYANOANTHRACENE-SENSITIZED TWO-ELECTRON OXIDATION OF PHENYLCYCLOPROPANE AND AROMATIC OLEFINS IN THE PRESENCE OF COPPER(II) ION
Authors: Mizuno Kazuhiko , Yoshioka Katsutoshi , Otsuji Yoshio
Published: July 2006

The photooxidation of phenylcyclopropane, styrene, and indene using 9,10-dicyanoanthracene-Cu(BF4)2 sensitizer system in acetonitrile-alcohol(3:1) solutions affords the corresponding 1,3-dialkoxy and 1,2-dialkoxy compounds.
COLLOIDAL NOBLE METAL CATALYSTS SUPPORTED ON INORGANIC CARRIERS
Authors: Nakao Yukimichi , Kaeriyama Kyoji
Published: July 2006

Hydrosols of rhodium, palladium, and platinum were prepared by the NaBH4-reduction of the corresponding metal salts in aqueous solution without using protective agents. Colloidal metals in the hydrosols were effectively adsorbed on inorganic carriers such as Mg(OH)2, to give highly active catalysts for olefin hydrogenation.
A CONVENIENT METHOD FOR THE PREPARATION OF ENOL ACETATES OF α-KETO ESTERS BY THE ALKYLATION OF CYANOHYDRIN SILYL ETHERS DERIVED FROM GLYOXYLIC ESTERS WITH BENZYL AND ALLYL HALIDES
Authors: Mukaiyama Teruaki , Oriyama Takeshi , Murakami Masahiro
Published: July 2006

Cyanohydrin silyl ethers, prepared by trimethylsilylcyanation of glyoxylic esters, smoothly react with LDA (lithium diisopropylamide) to yield the lithium salts, which in turn react with alkyl halides such as allyl bromide to give, after acetylation, the corresponding enol acetates of α-keto esters in good yields.
ACETOXYLATION OF PIPERIDINE DERIVATIVES AT THE 3-POSITION. STEREOSELECTIVE SYNTHESIS OF PSEUDOCONHYDRINE AND N-METHYLPSEUDOCONHYDRINE
Authors: Shono Tatsuya , Matsumura Yoshihiro , Onomura Osamu , Kanazawa Takenobu , Habuka Masahiro
Published: July 2006

Anodic oxidation of N-methoxycarbonylpiperidine derivatives in AcOH gave 2,3-diacetoxylated products, which were shown to be useful intermediates for the stereoselective synthesis of 3-hydroxypiperidine derivatives including pseudoconhydrine and N-methylpseudoconhydrine, the Conium alkaloids.
GENERAL METHOD OF STEREOSPECIFIC SYNTHESIS OF NATURAL POLYPRENOLS. SYNTHESIS OF BETULAPRENOL-6, -7, -8, AND -9
Authors: Sato Kikumasa , Miyamoto Osamu , Inoue Seiichi , Furusawa Fumio , Matsuhashi Yasusuke
Published: July 2006

A stereoselective synthesis of (Z,Z,Z)-12-benzyloxy-1-chloro-2,6,10-trimethyldodeca-2,6,10-triene (3) was achieved starting from (Z,Z)-farnesol. All the components of betulaprenols were synthesized using the C15 block 3 and its lower homologue (C10 block) as the key building blocks for the cisoid polyprenyl skeletone.
N-(TRIMETHYLSILYLMETHYL)AMINOMETHYL ETHERS AS AZOMETHINE YLIDE SYNTHONS. A NEW AND CONVENIENT ACCESS TO PYRROLIDINE DERIVATIVES
Authors: Hosomi Akira , Sakata Yasuyuki , Sakurai Hideki
Published: July 2006

The title compounds, readily prepared from (trimethylsilylmethyl)amines, formaldehyde and an alcohol, react with electron deficient alkenes in the presence of iodosilane or silyl triflate in combination with cesium fluoride to give the corresponding pyrrolidine derivatives stereospecifically in excellent yield.
SYNTHESIS OF cis- AND trans-2,6-DIALKYLATED PIPERIDINES THROUGH HIGHLY REGIOSELECTIVE α-ALKYNYLATION OF PYRIDINIUM SALTS AND ITS APPLICATION TO SYNTHESIS OF (±)-SOLENOPSINE A
Authors: Nakazono Yutaka , Yamaguchi Ryohei , Kawanisi Mituyosi
Published: July 2006

Reactions of N-methoxycarbonyl-2-alkylpyridinium salts with alkynyl Grignard reagents give exclusively 2,6-disubstituted 1,2-dihydropyridines, from which cis- and trans-2,6-dialkylated piperidines can be derived selectively. Consequently, (±)-solenopsine A is efficiently synthesized by this sequence.
A CONVENIENT METHOD FOR THE TRANSFORMATION OF ALCOHOLS TO ALKYL CHLORIDES USING N,N-DIPHENYLCHLOROPHENYLMETHYLENIMINIUM CHLORIDE
Authors: Fujisawa Tamotsu , Iida Sachio , Sato Toshio
Published: July 2006

N,N-Diphenylchlorophenylmethyleniminium chloride reacts smoothly with a variety of alcohols in the presence of triethylamine to afford the corresponding alkyl chlorides in high yields. Replacement of a hydroxyl group at an asymmetric carbon atom with chlorine proceeds with complete inversion.
POLY(VINYL CHLORIDE)/AZOBENZENE-LINKED BIS(15-CROWN-5) MEMBRANES. PHOTOINDUCED POTENTIAL CHANGES ACROSS ASYMMETRIC MEMBRANES
Authors: Anzai Jun-ichi , Sasaki Hiroshi , Ueno Akihiko , Osa Tetsuo
Published: July 2006

An azobenzene-linked bis(15-crown-5) (1) was entrapped in the plasticized poly(vinyl chloride) (PVC) membranes in order to regulate their membrane potential by photoirradiation. The membrane potential changed synchronously with trans-cis isomerization of 1 by UV and visible light irradiation even when no concentration gradient of electrolyte existed between the two external solutions separated by the membrane. The results were explicated in terms of the formation of asymmetric membranes, i.e., the surface potential of the irradiated side of the membrane was different from that of the opposite side.
BIS-(N,N-DIALKYLAMINO)-ALKOXYPHOSPHINES AS A NEW CLASS OF PHOSPHITE COUPLING AGENT FOR THE SYNTHESIS OF OLIGONUCLEOTIDES
Authors: Lee Hyun-Jae , Moon Sung-Hwan
Published: July 2006

A new class of bifunctional phosphitylating agent which is stable but readily activatable for the efficient synthesis of oligonucleotides is described.
A MELAMINE/HF-CARBON TETRACHLORIDE LIQUID–LIQUID TWO-PHASE MIXTURE. A HIGHLY VERSATILE HYDROFLUORINATING AGENT FOR ALKENES TO FACILITATE CONTINUOUS OPERATIONS
Authors: Yoneda Norihiko , Nagata Seiji , Fukuhara Tsuyoshi , Suzuki Akira
Published: July 2006

A melamine/hydrogen fluoride-pentane or carbon tetrachloride liquid–liquid two phase mixture has been found to be a highly convenient hydrofluorinating agent for alkenes and a suitable system for the repeated use.
STERICALLY HINDERED FERREDOXIN COMPLEXES AS A MODEL OF HIGH POTENTIAL IRON-SULFUR PROTEINS
Authors: Ueyama Norikazu , Terakawa Toshistugu , Sugawara Takashi , Fuji Michiaki , Nakamura Akira
Published: July 2006

4Fe-4S ferredoxin model complexes, [NEt4]2[Fe4S4(Z-cys-Ile-Ala-OMe)4], [N(n-Bu)4]2[Fe4S4(2,4,6-trimethylbenezenethiolato)4], and [NMe4]2[Fe4S4(2,4,6-triisopropylbenzenethiolato)4] having highly sterically hindered ligands exhibit an electrochemically quasi-reversible redox couple of 2-/1- at +0.12 V, +0.02 V, and −0.03 V vs. SCE, respectively, but an irreversible redox couple of 3-/2-. The results suggest that [Fe4S4(SR)4]1− is stabilized with protection by hydrophobic bulkiness, but that [Fe4S4(SR)4]3− is destabilized by the bulkiness.
ORGANIC SOLAR CELL FABRICATION USING QUINACRIDONE PIGMENTS
Authors: Tomida Masahito , Kusabayashi Shigekazu , Yokoyama Masaaki
Published: July 2006

The photovoltaic characteristics of quinacridone pigments dispersed in the polymer binder in the Schottky type solar cells are reported. The relatively high power conversion efficiency of 0.34% has been obtained at 550 nm and 200 μW·cm−2 with a light exponent of 0.6–0.7 for the short circuit photocurrent.
GLUCOAMYLASE IMMOBILIZED IN POLYSTYRENE FILM
Authors: Makino Keisuke , Tanigami Hajime , Takeuchi Tamio
Published: July 2006

Glucoamylase was immobilized in a polystyrene film by the method where the enzyme was suspended in benzene containing polystyrene and subsequently the mixture was casted on a glass board to make a film. The activity of the enzyme for soluble starch was found to be maintained through the immobilization.
ONE-DIMENSIONAL NATURE OF THE BAND-STRUCTURE PARAMETERS OF (BPDT-TTF)3(PF6)2 AND (BPDT-TTF)2I3
Authors: Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Kato Reizo , Kobayashi Hayao
Published: July 2006

Calculation of band-structure parameters of novel organic conductors, (BPDT-TTF)3(PF6)2 and (BPDT-TTF)2I3 (BPDT-TTF: bis(propylenedithio)tetrathiafulvalene), elucidates their one-dimensional nature. The tendency of BPDT-TTF to form highly aniso-tropic compounds is explained by means of the small spread of the highest occupied molecular orbital (HOMO) to the outer heterorings.
A CONVENIENT METHOD FOR THE PREPARATION OF MACROLIDES FROM TRIMETHYLSILYL ω-TRIMETHYLSILYLOXYCARBOXYLATES
Authors: Taniguchi Nagahiro , Kinoshita Hideki , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

Several macrolides were readily prepared from trimethylsilyl ω-trimethylsilyloxycarboxylates by the use of dipropylboryl trifluoromethanesulfonate (triflate) as a catalyst in good yields.
STRUCTURAL STABILITY OF SCHEELITE CATALYSTS IN THE REDUCTION-OXIDATION CYCLE
Authors: Ueda Wataru , Chen Ching-Ling , Asakawa Kiyoshi , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Structural stability of scheelite catalysts, Bi1−x/3V1−xMoxO4, in the reduction and reoxidation cycle increases with an increase of the mobility of the lattice oxide ions in the catalysts.
1,4-CHIRALITY TRANSFER VIA THE ESTER ENOLATE CLAISEN REARRANGEMENT
Authors: Nagatsuma Masako , Shirai Fumiyuki , Sayo Noboru , Nakai Takeshi
Published: July 2006

The Claisen rearrangement of (S)-1-buten-3-yl propanoate via the (E)- and (Z)-silylketene acetal has been shown to proceed with 96–100% of 1,4-chirality transfer to afford (E,R)- and (E,S)-2-methyl-4-hexenoic acid, respectively. The variation in sense and degree with solvent and silylating agent is discussed on mechanistic grounds.
SYNTHESIS OF ENAMINONES BY Pd(II) INDUCED DEHYDROGENATION OF β-AMINO KETONES
Authors: Murahashi Shun-Ichi , Tsumiyama Tatsuo , Mitsue Yo
Published: July 2006

The reaction of β-amino ketones with bis(acetonitrile)dichloropalladium(II) in the presence of triethylamine gives enaminones regioselectively.
STABLE ROTAMERS ABOUT A SULFUR-TO-CARBON SINGLE BOND IN 1,4-DIMETHOXY-9-BENZYLSULFONYLTRIPTYCENE: THEIR ISOLATION AND CHARACTERIZATION
Authors: Nakamura Nobuo , Oki Michinori
Published: July 2006

Oxidation of 1,4-dimethoxy-9-benzylthiotriptycene with mCPBA or hydrogen peroxide to the corresponding sulfone and subsequent chromatography on silica gel yielded two stable rotamers about the S–C(9) single bond. Kinetic parameters for their interconversion as well as their spectroscopic data have been also presented.
SYNTHESIS AND SWELLING OF Sr-FLUORINE MICAS
Authors: Kitajima Kunio , Shinomiya Yu , Takusagawa Nobuo
Published: July 2006

A series of Sr-micas corresponding to the general formula SrMg2Lix(Alxsi4−xO10)F2 (x=1.0–0.5 ) were synthesized and swelling with water was observed for the micas (x≤0.7). The difference in swelling tendencies of Sr-micas can be ascribed to the distribution of positive charge deficiency and the degree of distortion in tetrahedral sheets.
EFFECTS OF ADDITIVES ON THE SELECTIVITY IN FISCHER–TROPSCH SYNTHESIS BY ALUMINA-SUPPORTED RUTHENIUM CATALYSTS
Authors: Okuhara Toshio , Enomoto Toshiyuki , Tamura Hiroshi , Misono Makoto
Published: July 2006

Addition of K and P to Ru/Al2O3 changed the selectivity of Fischer–Tropsch synthesis by affecting mainly the electronic state of Ru; the K increased olefin/paraffin ratio and decreased the methane formation, and the effect of P was opposite. In contrast, the addition of V suppressed the methane formation with only a slight decrease in the olefin/paraffin ratio. These changes were not due to the electronic effect.
RING-EXPANSION OF 7-CHLORO-2-OXABICYCLO[4.2.0]OCT-4-EN-3-ONES TO 2H-OXOCIN-2-ONES WITH BASE. FORMATION OF A NEW OXACYCLOOCTATRIENONE SYSTEM
Authors: Shimo Tetsuro , Somekawa Kenichi , Kuwakino Junro , Uemura Hisako , Kumamoto Sanetada , Tsuge Otohiko , Kanemasa Shuji
Published: July 2006

The treatment of chlorinated 2-oxabicyclo[4.2.0]oct-4-en-3-ones, which are photoadducts between 4,6-dimethyl-2-pyrone and chloroethylenes, with a base gives new 2H-oxocin-2-ones in good yields. This provides the first example for preparation of a monocyclic oxacyclooctatrienone system.
NEW DITERPENES FROM THE BROWN ALGA PACHYDICTYON CORIACEUM
Authors: Ishitsuka Midori , Kusumi Takenori , Tanaka Jiro , Chihara Mitsuo , Kakisawa Hiroshi
Published: July 2006

Three new diterpenes, which possess a cyclononane skeleton, have been isolated from the brown alga Pachydictyon coriaceum, and their structures have been determined spectroscopically.
A FACILE SYNTHESIS OF 7,9-DI-(p-METHOXYBENZYL)-7,9-DIAZA-5-METHYLENE-6-(t-BUTYLDIMETHYLSILYL)OXY-2-OXABICYCLO[4,2,2]DECANE-8,10-DIONE
Authors: Yamaura Masanori , Suzuki Tsuneji , Hashimoto Hironobu , Yoshimura Juji , Shin Chung-gi
Published: July 2006

The title compound, a key intermediate for a total synthesis of bicyclomycin, was obtained from N,N′-diacetyl-anhydroglycine through 12 steps in ca. 4% overall yield.
CRYSTAL STRUCTURES OF PERMETHYLATED β-CYCLODEXTRIN COMPLEXES WITH R-(−)- AND S-(+)-FLURBIPROFEN
Authors: Harata Kazuaki , Hirayama Fumitoshi , Imai Teruko , Uekama Kaneto , Otagiri Masaki
Published: July 2006

Crystal structures of permethylated β-cyclodextrin complexes with R-(−)- and S-(+)-flurbiprofen have been determined by the X-ray method. Host molecules in both complexes are markedly distorted from the regular heptagonal structure, and include the phenyl group of the guest. The carboxyl group of the R-isomer forms a hydroqen bond with a water molecule, while the S-isomer is hydrogen-bonded to an oxygen atom of the adjacent host molecule.
ROLE OF SULFUR d ORBITALS IN THE S···N BOND STABILITY OF AMMONIOALKYLSULFURANES
Authors: Morokuma Keiji , Hanamura Mitsuyasu , Akiba Kin-ya
Published: July 2006

Using H2NCH2OCH2SHX+ (X=H and Cl) as model compounds, we examined the role of sulfur d orbitals on the stability of S···N bonded cyclic ammonioalkylsulfuranes. The ab initio Hartree–Fock calculation with sulfur d orbitals gives a cyclic structure, while the calculation without d causes breaking of the S···N bond.
STRUCTURE OF ISOCHAMAEJASMIN FROM STELLERA CHAMAEJASME L.
Authors: Niwa Masatake , Chen Xiang-Fang , Liu Guo-Quan , Tatematsu Hiroshi , Hirata Yoshimasa
Published: July 2006

A new C-3/C-3″-biflavanone named isochamaejasmin has been isolated from Stellera chamaejasme L. (Thymelaeaceae) and its structure has been elucidated by spectroscopic and chemical methods. Furthermore, the stereochemistry of some C-3/C-3″-biflavanones including isochamaejasmin was discussed.
STRUCTURE OF RABDOHAKUSIN
Authors: Kubo Isao , Matsumoto Takeshi , Asaka Yukihiro , Kubota Takashi , Naoki Hideo , Fludzinski Pawel , Kende Andrew S
Published: July 2006

The structure of a new 8,9-seco-ent-kaurene compound, rabdohakusin, isolated from Rabdosia umbrosa var. hakusanensis (Kudo) Hara (Labiatae) has been determined by spectroscopic methods including 2D NMR.
SUPERACID CATALYZED OXYGENATION OF ALIPHATIC ETHERS WITH OZONE
Authors: Yoneda Norihiko , Kiuchi Takashi , Fukuhara Tsuyoshi , Suzuki Akira , Olah George A
Published: July 2006

Electrophilic insertion of protonated ozone into tertiary or secondary C–H bonds located at γ or farther away positions from the oxygen atom in aliphatic ethers was observed to produce oxoalkyl ethers in HF–SbF5 superacid media at −40 °C.
ISOLATION AND X-RAY STRUCTURAL DETERMINATION OF THREE NEW DITERPENOIDS FROM THE MARINE ALGA TAONIA ATOMARIA
Authors: Gonzalez Antonio G , Martin Julio D , Perez Cirilo , Rovirosa Juana , Tagle Bruce , Clardy Jon
Published: July 2006

Two new peroxylactones and one hemilactal triacetate based on the atomaric acid skeleton were isolated from the brown seaweed Taonia atomaria. These unusual structures have been elucidated on the basis of X-ray crystallography.
A STEREOSELECTIVE SYNTHESIS OF A FUNCTIONALIZED TRICYCLO[6.3.1.03,8]DODEC-4-ENE BY AN INTRAMOLECULAR DIELS–ALDER REACTION
Authors: Shishido Kozo , Hiroya Kou , Ueno Yutaka , Fukumoto Keiichiro , Kametani Tetsuji , Honda Toshio
Published: July 2006

An intramolecular Diels–Alder reaction of the cyclohexatrienone derivatives gives the title compounds, which have a useful structural feature for constructing basic carbon frameworks of some kinds of natural products, in a stereoselective manner.
WAVELENGTH-DEPENDENT PEROXIDE FORMATION UPON IRRADIATION OF all-trans RETINAL IN AN AERATED SOLUTION
Authors: Tsujimoto Kazuo , Hozoji Hiroshi , Ohashi Mamoru , Watanabe Masakatsu , Hattori Hiroyuki
Published: July 2006

Irradiation of an aerated solution of all-trans retinal in acetonitrile gave the 5,8-peroxyretinal in a quantum yield of 0.03 together with the retinal isomers. The formation of the peroxide was predominant on the irradiation with light at wavelength shorter than 400 nm.
PHOTOOXIDATION OF ADAMANTYLIDENEADAMANTANE IN THE PRESENCE OF TETRACYANOETHYLENE. A NEW PHOTOEPOXIDATION PROCESS
Authors: Akaba Ryoichi , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

Irradiation of a dichloromethane solution of adamantylideneadamantane in the presence of tetracyanoethylene with bubbling oxygen through a pyrex filter by a 650-W tungsten-halogen lamp gave a high yield (84%) of the corresponding epoxide. A reasonable mechanism for the efficient epoxidation will be described.
STUDIES ON THE CRYSTAL STRUCTURE AND THE PLASTIC CRYSTALLINE PHASE OF TETRACHLOROFERROCENE
Authors: Sato Kumiko , Konno Michiko , Sano Hirotoshi
Published: July 2006

The structure of the ordered room-temperature phase of tetrachloroferrocene was determined by single-crystal X-ray diffraction. The structure is monoclinic, space group P21 and final R=0.038 for 1129 independent reflections. The chloro groups have a 1,1′,2,2′ configuration with an average rotation of 2.5° of the rings from the eclipsed configuration. Mössbauer spectra exhibit a line broadening ascribed to fluctuation of the electric field gradient (EFG) caused by the orientational disorder between the x or y and z axes of molecule.
AN APPLICATION OF PHOTOELECTROCHEMICAL DEPOSITION OF HYDROPHOBIC ORGANIC LAYERS ON SEMICONDUCTOR ELECTRODES TO IMAGING SYSTEMS
Authors: Masuda Hideki , Shimidzu Naoki , Ohno Shin
Published: July 2006

Photoelectrochemical oxidation of aromatic compounds on semiconductor electrodes was applied to an imaging system. Change of hydrophilic and hydrophobic properties (wettability) of the surface of the semiconductor electrodes accompanied with organic layer deposition was studied by measuring the contact angle and its applicability to imaging systems was evaluated.
DRAMATICALLY ENHANCED ENANTIOSELECTIVE HYDROLYSIS OF AMINO ACID ESTERS WITH TRIPEPTIDE NUCLEOPHILE BY CONTROLLING THE REACTION FIELD AT ROOM TEMPERATURE
Authors: Ueoka Ryuichi , Matsumoto Yoko , Ihara Yasuji
Published: July 2006

The high enantioselective hydrolysis (ka,obsdL⁄ka,obsdD=27) of p-nitrophenyl N-dodecanoyl-d(l)-phenylalaninate with N-benzyloxycarbonyl-l-phenylalanyl-l-histidyl-l-leucine in the vesicular system (ditetradecyldimethylammonium bromide) was enhanced dramatically by the addition of micelles (hexadecyltrimethylammonium bromide) and attained to the enantiomer rate ratio (ka,obsdL⁄ka,obsdD)=71 at room temperature (25 °C).
N-(TRIMETHYLSILYLMETHYL)CARBODIIMIDES AND -KETENIMINE AS PRECURSORS OF IMINO- AND ALKYLIDENE-2-AZAALLYL ANIONS
Authors: Tsuge Otohiko , Kanemasa Shuji , Matsuda Koyo
Published: July 2006

The fluoride-induced desilylation of N-(trimethylsilylmethyl)carbodiimides and -ketenimine generates imino- and alkylidene-2-azaallyl anions which cycloadd to a variety of aldehydes giving regioisomeric 1,3-oxazolidines as cycloadducts.
THE CRYSTAL STRUCTURES OF (BEDT-TTF)ReO4(THF)0.5 AND (BEDT-TTF)IO4(THF)0.5
Authors: Kobayashi Hayao , Kobayashi Akiko , Sasaki Yukiyoshi , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

The crystal structures of (BEDT-TTF)ReO4(THF)0.5 and (BEDT-TTF)IO4(THF)0.5 are reported (BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene, THF=tetrahydrofuran). These salts of BEDT-TTF cations are isomorphic. There are chains of BEDT-TTF dimers. The bond lengths of BEDT-TTF+ differ systematically from those of the neutral BEDT-TTF molecule.
PUMMERER REARRANGEMENT PROMOTED BY POLYPHOSPHORIC ACID TRIMETHYLSILYL ESTER (PPSE)
Authors: Kakimoto Masa-aki , Imai Yoshio
Published: July 2006

It was found that PPSE catalyzed Pummerer rearrangement of various types of sulfoxides. When α-(phenylsulfinyl)acetophenone was used as sulfoxide, unusual product, phenyl phenylthioglyoxylate was isolated. The reaction seems to proceed via phosphorylation of oxygen of sulfoxides.