bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNTHESIS OF β, γ-UNSATURATE CARBOXYLIC ACID DERIVATIVES BY THE NOVEL Ni (CO)4-INDUCED RING-OPENING CARBONYLATION REACTION OF 1,1-DIBROMO-2-CHLOROCYCLOPROPANES
Authors: Hirao Toshikazu , Nagata Shinichiro , Agawa Toshio
Published: July 2006

1,1-Dibromo-2-chlorocyclopropanes underwent the Ni (CO)4-induced ring-opening carbonylation reaction with alcohol or amine giving the β, γ,-unsaturated carboxylic acid and dicarboxylic acid derivatives. Use of N,N-dimethyltrimethylsilylamine as an initial nucleophile in the presence of benzaldehyde led to a dienecarboxamide presumably via codensation of the nickel enolate intermediate.
REGIO AND STEREOSELECTIVE COUPLING REACTION OF GRIGNARD REAGENTS WITH β-PHENYLTHIO β,γ-UNSATURATED ALCOHOLS USING TETRACHLOROSILANE. A NEW METHOD FOR THE PREPARATION OF (Z)-ALKENYL SULFIDES
Authors: Fujiwara Tooru , Yanagihara Hiroyuki , Yamada Takafumi , Suzuki Koichi , Takeda Takeshi
Published: July 2006

The coupling reaction of (E)-β-phenylthio β,γ-unsaturated alcohols with Grignard reagents using tetrachlorosilane as a condensation reagent gave (Z)-SN2′ products exclusively, whereas the reaction of the corresponding Z-isomers proceeded by SN2 attack with retention of double bond geometry.
LASER-PHOTOLYSIS STUDY OF ARYL-SUBSTITUTED GERMYL ANIONS
Authors: Mochida Kunio , Wakasa Masanobu , Ishizaka Shin-ichi , Kotani Masahiro , Sakaguchi Yoshio , Hayashi Hisaharu
Published: July 2006

Photochemical primary processes of aryl-substituted germyl anions were studied at room temperature. The germyl radicals generated were observed directly by laser-photolysis.
AN EFFICIENT SYNTHESIS OF (2S,3R)- AND (2S,3S)-SPHINGOSINE
Authors: Obayashi Michio , Schlosser Manfred
Published: July 2006

A straightforward sequence of reactions allows the conversion of D(+)-Mannose and D(+)-ribono-1,4-lactone into “erythro”-(2S,3R)-and “threo”-(2S,3S)-sphingosine, respectively.
CATALYTIC BEHAVIOR OF BORIA-ALUMINA PREPARED BY CHEMICAL VAPOR DEPOSITION TECHNIQUE
Authors: Sakurai Hiroaki , Sato Satoshi , Urabe Kazuo , Izumi Yusuke
Published: July 2006

Catalytic behavior of boria-alumina greatly changed with B2O3 content. When B2O3≤12 wt%, both boria-aluminas (H0≥−8.2) obtained by CVD and impregnation methods showed almost the same catalytic activity, but at higher B2O3 contents (≥15 wt%, H0≥−3.0) the CVD boria-alumina exhibited higher catalytic efficiency, e.g. for the vapor-phase Beckmann rearrangement of cyclohexanone oxime.
MICROWAVE SPECTRUM AND DIPOLE MOMENT OF FLUOROALLENE
Authors: Ogata Teruhiko , Yoshikawa Mitsugu , Fujii Kazuhito
Published: July 2006

The microwave spectrum of H2C=C=CHF has been studied in the 40 to 45 GHz region and b-type Q-branch transitions for the ground vibrational state has been assigned. The rotational constants are A=46276.658(10) MHz, B=4300.038(3) MHz, and C=4039.161(3) MHz. The dipole moments are μa=1.55(2) D, μb=0.835(5) D, and μtotal=1.76(2) D. The molecular structure which reproduces the observed moments of inertia is calculated.
ESR AND PHOTOLUMINESCENCE EVIDENCE FOR THE PHOTOCATALYTIC FORMATION OF HYDROXYL RADICALS ON SMALL TiO2 PARTICLES
Authors: Anpo Masakazu , Shima Takahito , Kubokawa Yutaka
Published: July 2006

ESR and photoluminescence studies have clarified that UV irradiation of the small TiO2 particle in the presence of H2O leads to the formation of \overset•OH radicals, which are formed by trapping of photo-formed holes by the surface OH− groups.
ELECTROCHEMICAL PREPARATION OF ISOCYANIDE COMPLEXES OF LOW-VALENT PLATINUM CONTAINING A METAL–METAL BOND
Authors: Yamamoto Yasuhiro , Takahashi Katsuo , Yamazaki Hiroshi
Published: July 2006

The potentiostatic reduction of cis-PtCl2(RNC)2 (3a:R = 2,4-t-Bu2-6-MeC6H2; 3b: R = 2,4,6-t-Bu3C6H2; 3c: R = 2,6-Me2C6H3) were carried out on a mercury pool electrode in CH3CN. The one-electron reduction (96.5 kC/mol) of 3a and 3b gave [PtCl(RNC)2]2 (4a and 4b). An X-ray analysis of 4a showed that the two PtCl(RNC)2 planes jointed by a Pt-Pt bond were perpendicular. The two-electron reductions (2×96.5 kC/mol) of 3a and 3b gave Hg[Pt3(RNC)6]2 and Pt3(RNC)6, respectively. Electrolysis of 3c gave only Hg[Pt3(2,6-MeC6H3NC)6]2.
CRYSTAL STRUCTURE AND REFLECTION SPECTRA OF (DBTTF)2-(Cu2Br6) COMPLEX
Authors: Tanaka Masashi , Honda Masako , Katayama Chuji , Fijimoto Hitoshi , Tanaka Jiro
Published: July 2006

X-Ray and optical reflection measurements of (DBTTF)2-(Cu2Br6) single crystals were carried out. The single crystal of the complex consists of stacking columns of the cation molecules DBTTF +. The analysis of the reflection spectra of (DBTTF)2-(Cu2Br6) single crystals shows that the electronic structure of DBTTF+ cation system is typical of the dimer type configuration.
PHOTOCHEMICAL, THERMAL, AND CoTPP-CATALYZED DECOMPOSITION OF 2-PYRAZINONE 3,6-ENDOPEROXIDES. NOVEL SYNTHESIS OF THE UNSYMMETRICAL IMIDES
Authors: Nisho Takehiko , Nakajima Naoko , Kondo Masaji , Omote Yoshimori
Published: July 2006

Photochemical, thermal, and CoTPP-catalyzed decomposition of 2-pyrazinone 3,6-endoperoxides, which were readily obtained by the reaction of 2-pyrazinones with singlet oxygen, gave the unsymmetrical imides in moderate to high yields.
SELECTIVE HYDROGENATION OF ACROLEIN BY NICKEL–TITANIUM ALLOY CATALYSTS
Authors: Funakoshi Masaki , Komiyama Hiroshi , Inoue Hakuai
Published: July 2006

Ni28Ti72 alloy catalyst was found to have a high selectivity for the hydrogenation of acrolein to propionaldehyde. However, both the carbon-carbon double bond and the formyl group were hydrogenated by supported nickel or nickel ultra-fine particles, leading to the simultaneous production of 1-propanol together with propionaldehyde. The retardation of the formyl group hydrogenation by alloying has been suggested to be caused by the electronic effect.
SIMULTANEOUS REMOVAL OF NO AND SO2 WITH H2S OVER SOLID CATALYSTS
Authors: Iizuka Tokio , Ichikawa Tsutomu , Egashira Shinji , Tanabe Kozo
Published: July 2006

The reduction of NO and SO2 with H2S was examined over various metal oxide catalysts at 150–200 °C. Molybdenum oxide supported on MgO was most active for the reduction of NO and SO2 among the catalysts used. Alumina also showed considerably high activity, but the activity depended markedly on the preparation of the catalyst.
VAPOR-PHASE BECKMANN REARRANGEMENT OF CYCLOHEXANONE OXIME OVER SILICA-BORIA CATALYST PREPARED BY CHEMICAL VAPOR DEPOSITION METHOD
Authors: Sato Satoshi , Sakurai Hiroaki , Urabe Kazuo , Izumi Yusuke
Published: July 2006

Cyclohexanone oxime was converted to ε-caprolactam in a high yield of 93% at 250 °C over a silica-supported boron oxide catalyst which was prepared by means of chemical vapor deposition. This catalyst was much more efficient than silica-boria and alumina-boria which were obtained by the usual impregnation method.
A CONVENIENT METHOD FOR THE PREPARATION OF 6-SUBSTITUTED 7,8,9,10-TETRAHYDROPHENANTHRIDIN-7-ONES
Authors: Matsuo Keizo , Ohta Masanobu , Tanaka Kuniyoshi
Published: July 2006

6-Substituted 7,8,9,10-tetrahydrophenanthridin-7-one system was prepared from 3-(2-acylaminophenylthio)cyclohex-2-enones by dehydrative cyclization and concomitant sulfur extrusion with polyphosphoric acid in a single operation.
REACTION OF OXIRANES WITH DIANION OF METHYL ACETOACETATE IN THE PRESENCE OF BORON TRIFLUORIDE ETHERATE
Authors: Yamaguchi Masahiko , Hirao Ichiro
Published: July 2006

Oxiranes were reacted with dianion of methyl acetoacetate in the presence of boron trifluoride etherate to give the substituted tetrahydro-2-furylideneacetates, which were further converted to γ-lactones.
A NEW FLUORIDE ANION-PROMOTED 1,4-CYCLOADDITION LEADING TO SYNTHESIS OF α-TETRALONES
Authors: Aono Masahiro , Terao Yoshiyasu , Achiwa Kazuo
Published: July 2006

Fluoride anion-promoted 1,4-cycloaddition of methyl o-trimethylsilylmethylbenzoate to conjugated olefins was found to give α-tetralones and uncyclized Michael adducts in moderate yields.
FLOW INJECTION ANALYSIS OF α-AMINO ACIDS BY THE CHEMILUMINESCENCE METHOD
Authors: Hara Tadashi , Toriyama Motohiro , Ebuchi Takashi , Imaki Masakatsu
Published: July 2006

Various α-amino acids could be determined on the basis of the findings that the catalytic activity of copper(II) against the chemiluminescence between luminol and hydrogen peroxide is lowered in the presence of an α-amino acid. The detection limit of L-aspartic acid was 2.7 ng as an injecting amount.
SEQUENCE HOMOLOGY AND STRUCTURAL SIMILARITY AMONG B 870 (B 890) POLYPEPTIDES OF PURPLE PHOTOSYNTHETIC BACTERIA AND THE MODE OF BACTERIOCHLOROPHYLL BINDING
Authors: Nozawa Tsunenori , Ohta Masaru , Hatano Masahiro , Hayashi Hidenori , Shimada Keizo
Published: July 2006

Interspecies comparison of B 870 (B 890) bacteriochlorophyll proteins of several purple photosynthetic bacteria revealed homology in the amino acid sequences. The hydrophobic segment of the protein was predicted to span a membrane in an α-helical structure, where one histidine residue (the candidate of a BChl binding site) exists.
PREPARATION OF POLYDIACETYLENES WITH PURE ALIPHATIC SUBSTITUENTS
Authors: Kiji Jitsuo , Konishi Hisatoshi , Okano Tamon , Koyuhara Norikazu , Sakakibara Masaaki
Published: July 2006

Diacetylenes, R–C≡C-C≡C–R, (R =–(CH2)n–CH3, n=5,7,9), were irradiated with UV light or γ-ray, yielding red polymers, [=(R)C–C≡C–C(R)=]x, of which structure was confirmed by the Raman spectroscopy.
STEREOSELECTIVE FORMATION OF (E)-1-ALKENYL ETHERS. THE COUPLING REACTION OF 1,3- OR 3,3-DIETHOXY-1-PROPENE WITH GRIGNARD REAGENTS CATALYZED BY NICKEL–PKOSPHINE COMPLEX
Authors: Sugimura Hideyuki , Takei Hisashi
Published: July 2006

1,3- or 3,3-Diethoxy-1-propene reacted with Grignard reagents in the presence of nickel-phosphine complex to give (E)-1-alkenyl ethers stereoselectively.
AN IMPROVED ASYMMETRIC SYNTHESIS OF (R)-(−)-2-ACETYL-5,8-DIMETHOXY-1,2,3,4-TETRAHYDRO-2-NAPHTHOL. A VERSATILE KEY SYNTHETIC INTERMEDIATE OF OPTICALLY ACTIVE ANTHRACYCLINONES
Authors: Suzuki Michiyo , Kimura Yoshikazu , Terashima Shiro
Published: July 2006

The bromolactonization of the (−)-acetals prepared from readily available 2-acetyl-5,8-dimethoxy-3,4-dihydronaphthalene and (1R,2R)-(+)-tartaric acid diamide derivatives was found to proceed highly diastereoselectively, giving the seven-membered bromolactones. The bromolactones could be effectively converted to the title compound, >95%ee, in one-pot reaction.
CATHODIC ESTERIFICATION OF CARBOXYLIC ACIDS
Authors: Awata Takeshi , Baizer Manuel M , Nonaka Tsutomu , Fuchigami Toshio
Published: July 2006

A cathodic method for the esterification of carboxylic acids under mild conditions was found. The esterification proceeded smoothly at room temperature by the reaction of alkylating reagents with quaternary ammonium carboxylates formed in a cathode chamber.
PEROVSKITE-TYPE OXIDES HAVING SEMICONDUCTIVITY AS OXYGEN SENSORS
Authors: Shimizu Yasuhiro , Fukuyama Yoshiki , Narikiyo Tomoki , Arai Hiromichi , Seiyama Tetsuro
Published: July 2006

Among the perovskite-type oxides examined, SrTiO3 showed a high sensitivity to oxygen in the “lean-burn” region. The resistivity characteristics of the specimen were also investigated in the exhaust gas of propane-oxygen combustion. SrSnO3 is promising for a combustion monitoring sensor.
ADSORPTION OF METHANOL ON THE SURFACES OF COPPER ALLOYS. UPS AND EELS STUDIES
Authors: Prabhakaran Kuniyil , Hegde Manjanath Subraya , Rao Chintamani Nagesa Ramachandra
Published: July 2006

Methanol adsorbs molecularly on the surfaces of Cu–Pd alloys at low temperatures and transforms to CH3O or CO on warming, depending upon the alloy composition. On oxygen presorbed Cu–Pd alloy surfaces, adsorption of methanol gives rise to H2O and H2CO. CH3OH adsorbed molecularly on the surfaces of Cu–Au alloys and CH3O is formed only at relatively high temperatures.
MÖSSBAUER SPECTROSCOPIC STUDY ON 1′-MONOHALOBIFERROCENES
Authors: Suto Kyoko , Katada Motomi , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

In a series of 1′-monohalobiferrocenes, it has been found that their triiodide salts show a trapped valence state of iron atoms, although the monocations of 1′,1'″-diiodo- and dibromobiferrocene show an averaged valence state in the temperature range from 4.2 K to 298 K.
ab initio CALCULATION OF DIPHOSPHENE AND CYCLOPOLYPHOSPHANES
Authors: Yoshifuji Masaaki , Inamoto Naoki , Ito Keiji , Nagase Shigeru
Published: July 2006

Total energies and optimized structures were calculated by the ab initio method on the system (PH)n (n = 2–6) and characteristic properties and relative stabilization energies are discussed.
PALLADIUM-CATALYZED REGIO- AND STEREOSELECTIVE DESULFONYLATION OF ALLYLIC SULFONES WITH LiHBEt3. APPLICATION TO THE SYNTHESIS OF SQUALENE
Authors: Mohri Mitsunobu , Kinoshita Hideki , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

Allylic p-tolyl sulfones were easily desulfonylated to the corresponding alkenes by LiHBEt3 in the presence of a catalytic amount of [PdCl2(dppp)] under mild conditions with the preservation of the original stereochemistry. This reaction was successfully applied to the synthesis of squalene.
CIS-TRANS PHOTOISOMERIZATION AND PHOTOOXYGENATION OF 1,2-DIARYLCYCLOPROPANES, SALT EFFECTS ON THE PHOTOINDUCED ELECTRON TRANSFER REACTIONS
Authors: Mizuno Kazuhiko , Ichinose Nobuyuki , Otsuji Yoshio
Published: July 2006

The efficiencies of the 9,10-dicyanoanthracene (DCA)-sensitized cis-trans photoisomerization and photooxygenation of cis- and trans-1,2-bis(4-methoxyphenyl)cyclopropanes (c-CP and t-CP) in CH3CN were remarkably enhanced by the addition of inorganic salts such as LiBF4 and Mg(ClO4)2. The mechanistic implication of the salt effects on these photoreactions was discussed.
THE DEACTIVATION/REACTIVATION OF COBALT(III) TETRAKIS(4-PYRIDYL)PORPHYRIN ELECTROCATALYST
Authors: Su Y Oliver , Kuwana Theodore
Published: July 2006

Cobalt tetrakis(4-pyridyl)porphyrin (abbr:CoTPyP) absorbed on a glassy carbon electrode (abb:GCE) catalyzed the reduction of oxygen to hydrogen peroxide at a rate of 1.0×106 mol−1 dm3 s−1. Although the CoTPyP exhibited deactivation, it was found that the activity could be restored by open-circuit relaxation.
AN ELECTROREDUCTIVE SYNTHESIS OF ALLYLSILANES AND BENZYLSILANES
Authors: Shono Tatsuya , Matsumura Yoshihiro , Katoh Susumu , Kise Naoki
Published: July 2006

The electrochemical reduction of benzyl and allyl halides carried out in the presence of chlorotrimethylsilane afforded the corresponding benzylsilanes and allylsilanes in satisfactory yields.
THE TOTAL SYNTHESIS OF (±)-LATIFINE
Authors: Takano Seiichi , Akiyama Masashi , Ogasawara Kunio
Published: July 2006

Latifine, a novel phenolic isoquinoline base from Crinum latifolium L. (Amaryllidaceae), has been synthesized.
CATALYTIC ACTIVITIES OF COPPERS IN THE VARIOUS OXIDATION STATES FOR THE DEHYDROGENATION OF METHANOL
Authors: Takagi Katsuhiko , Morikawa Yutaka , Ikawa Tsuneo
Published: July 2006

The catalytic activities of coppers for the conversion of methanol are individually different by their oxidation states. Cu(II) ion and Cu(O) catalyze the dehydrogenation to form methyl formate and formaldehyde, respectively, while Cu(I) ion is inactive.
AN EFFICIENT SYNTHESIS OF (S)-CHROMANMETHANOL, A VITAMIN E PRECURSOR
Authors: Takabe Kunihiko , Okisaka Koichi , Ushiyama Yujiro , Katagiri Takao , Yoda Hidemi
Published: July 2006

The (S)-chromanmethanol, a key intermediate for the synthesis of optically active α-tocopherol was synthesized by a reaction sequence which utilized the asymmetric epoxidation of the (E)-allylic alcohol to the (2R,3R)-epoxyalcohol in high enantiomeric excess.
PALLADIUM-CATALYZED DOUBLE CARBONYLATION REACTIONS OF ARYL HALIDES AFFORDING α-KETO ESTERS
Authors: Ozawa Fumiyuki , Kawasaki Nobuo , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

Various aryl iodides can be converted into α-keto esters in reactions with carbon monoxide and alcohols in the presence of tertiary amines and catalytic amounts of tertiary phosphine-coordinated palladium complexes.
THE ENE REACTION OF TRISUBSTITUTED ALKENES WITH ELECTRON-DEFICIENT NITRILES IN THE PRESENCE OF BORON TRICHLORIDE
Authors: Hamana Hiroshi , Sugasawa Tsutomu
Published: July 2006

The ene reaction of trisubstituted alkenes with electron-deficient nitriles proceeds smoothly in the presence of boron trichloride to afford β,γ-unsaturated ketones in high yields. Investigation of the stereochemistry of the ene products suggests that this ene reaction is a concerted one. Similar reactions of cyclic trisubstituted alkenes are also described.
MILD AND SELECTIVE OXIDATIONS WITH POLYSTYRENE-BOUND DIARYL SELENOXIDE
Authors: Hu Nan Xing , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Polystyrene-bound diaryl selenoxide is shown to behave as a mild oxidizing agent for thiol to disulfide, sulfide to sulfoxide, phosphine to phosphine oxide, and hydroguinone to benzoguinone. In addition, it effects solvent-dependent reactions of thioamide to nitrile in usual solvent and to thiadiazole in acetic acid.
THE STRUCTURE OF A CELLULOSE SHEET IN THE NASCENT FIBRIL PRODUCED BY ACETOBACTER XYLINUM
Authors: Kai Akira , Koseki Tomoki
Published: July 2006

It became clear that the nascent fibril produced by Acetobacter xylinum crystallizes into cellulose II, when treated with alkali of a very low concentration ranging from 1×10−3 to 1.0×10−2 wt%. This fact shows that the bonding strength of inter-molecules of a cellulose sheet, as well as the bonding strength between the cellulose sheets in the nascent fibril, is very weak.
SYNTHESIS OF (+)-(3S,6S,10S,13S,17S,20S,24S,27S)-1,8,15,22-TETRAAZA-3 ,6;10,13;17,20;24,27-TETRAEPOXYCYCLOOCTACOSANE. AN ENANTIOMERICALLY PURE TETRAAZACROWN ETHER WITH D4 SYMMETRY AND OF KNOWN ABSOLUTE CONFIGURATION
Authors: Naemura Koichiro , Hokura Yukio , Kanda Yuji , Nakazaki Masao
Published: July 2006

The title azacrown ether, which was synthesized using (+)-(2S,5S)-trans-2,5-bis(aminomethyl)tetrahydrofuran and (+)-(2S,5S)-trans-2,5-bis(hydroxymethyl)tetrahydrofuran as the C2 building blocks, is the first optically active organic molecule of D4 Symmetry with known absolute configuration.
ORBITAL COMPLEMENTARY AND COUNTERCOMPLEMENTARY EFFECTS IN SUPEREXCHANGE INTERACTION THROUGH HETEROBRIDGES IN BINUCLEAR COPPER(II) COMPLEXES
Authors: Nishida Yuzo , Takeuchi Masataka , Takahashi Kazuhiro , Kida Sigeo
Published: July 2006

Low antiferromagnetism of μ-alkoxo-μ-carboxylatodicopper(II) complexes were reasonably explained in terms of the orbital countercomplementary effect based on Hoffmann’s theory for superexchange interaction.
FORMATION OF QUATERNARY CARBON CENTERS FROM TERTIARY NITRO COMPOUNDS BY FREE RADICAL METHODS
Authors: Ono Noboru , Miyake Hideyoshi , Kaji Aritsune
Published: July 2006

The radical intermediates generated by denitration of tertiary nitro compounds with tributyltin hydride undergo the carbon–carbon bond forming reaction with double bonds, which provides a useful method for the construction of quaternary carbon centers.
DICYANOANTHRACENE-SENSITIZED PHOTOOXYGENATION OF THUJOPSENE
Authors: Hatsui Toshihide , Suzuki Nobumasa , Takeshita Hitoshi
Published: July 2006

9,10-Dicyanoanthracene-sensitized photooxygenation of thujopsene proceeded by singlet oxygen, but the reaction with added biphenyl caused an electron transfer and produced a novel product which has no longer possessed the cyclopropane ring. The ring cleavage is best explained in terms of intermediary formation of a radical cation.
A SYNTHETIC APPROACH TO (+)-THIENAMYCIN FROM METHYL (R)-3-HYDROXYBUTANOATE. A NEW ENTRY TO (3R, 4R)-3-[(R)-1-HYDROXYETHYL]-4-ACETOXY-2-AZETIDINONE
Authors: Chiba Toshiyuki , Nakai Takeshi
Published: July 2006

A new entry to the O-silylated form of the title azetidinone, a well-established key intermediate for thienamycin synthesis, is described which relies on the stereocontrolled transformation of the 2-azetidinone obtained via the condensation of methyl (R)-3-hydroxybutanoate with the N-silylimine of trimethylsilylpropynal.
NOUVELLE SYNTHESE DE FURANNES
Authors: Duhamel Lucette , Chauvin et Joë
Published: July 2006

The cyclization of α-thiosubstituted 1,4-diketones affords a convenient synthesis of a variety of 3-thiosubstituted furans with quantitative yields, and very mild experimental conditions (CH2Cl2, 15 °C, Cat.: ISiMe3 or BrSiMe3 or ClSiMe3–ZnBr2). These methods were also applied to simple 1,4-diketones.
HIGH CHEMOSELECTIVE SYNTHESIS OF CARBOXAMIDES BY USING SYN-PHENYLPYRIDYL-O-ACYL OXIMES(PPKO)
Authors: Miyasaka Tadayo , Noguchi Shunsaku
Published: July 2006

Various carboxamides are prepared chemoselectively in good yields by using syn-phenylpyridyl ketoxime(PPKO) as functional leaving group.
CLUSTER IONS OF WATER OBSERVED BY LIQUID IONIZATION MASS SPECTROMETRY
Authors: Tsuchiya Masahiko , Otsuka Kiichiro , Kuwabara Hirofumi
Published: July 2006

Cluster ion distributions were measured and stable ions were observed at m/z 379 (21 molecules), 505, 73, and 181. Significant effects of a high electric field and temperature of a needle on the ion abundances strongly suggest that water vapor in argon under the atmospheric pressure condenses on the needle and ionization occurs at the liquid surface where cluster molecules of water exist.
ZINC-PHOTOSENSITIZED CIS–TRANS ISOMERIZATION OF 2-BUTENES
Authors: Yamamoto Shunzo , Nobusada Naoki , Sueishi Yoshimi , Nishimura Norio
Published: July 2006

The zinc-photosensitized isomerization of cis- and trans-2-butenes has been studied. The photostationary cis/trans ratio was found to be about 1/1.5 and to be independent of the 2-butene pressure.
THE INFLUENCE OF INTERLAYER WATER ON CLAY CATALYSTS. INTERLAMELLAR CONVERSIONS OF 2-METHYLPROPENE
Authors: Ballantine James A , Jones William , Purnell J Howard , Tennakoon Dayananda T B , Thomas John M
Published: July 2006

Evidence is provided for two alternative pathways for the reactions undergone by 2-methylpropene between the layers of a sheet silicate catalyst (Al3+-exchanged montmorillonite). This clay, when it initially contains ca. 12% interlayer water, catalyses the addition of either water or methanol to 2-methylpropene to yield, respectively, t-butanol or 2-methoxy-2-methyl propane (methyl tertiary butyl ether, MTBE), whereas the same clay following deliberate dehydration acts as an effective catalyst for the oligomerisation of 2-methylpropene, Similar results are obtained with an Al3+-exchanged synthetic hectorite.
ADSORPTION OP PHENOL, CRESOLS, AND BENZYL ALCOHOL FROM AQUEOUS SOLUTION BY SILICALITE
Authors: Narita Eiichi , Horiguchi Naoto , Okabe Taijiro
Published: July 2006

Silicalite, an aluminium-free analogue of zeolite ZSM-5, selectively adsorbs phenol, cresols,and benzyl alcohol from aqueous solution and its adsorption capacity is superior to that of ZSM-5. The amount of these organic molecules adsorbed is benzyl alcohol ≅ p- > m- > o-cresol >> phenol in the order.
THE ANTI-SELECTIVE MICHAEL ADDITION OF TIN(II) ENOLATES OF CYCLIC KETONES TO β-NITROSTYRENE
Authors: Stevens Rodney W , Mukaiyama Teruaki
Published: July 2006

The tin(II) enolates of cyclic ketones were found to react with β-nitrostyrene to afford the corresponding 4-nitroketones with unprecedented anti-selectivity. In the case of the reaction of the tin(II) enolate of cyclohexanone with β-nitrostyrene, the anti-adduct was yielded in >93:7 diastereomeric excess.
SYNTHESIS OF 4H-BENZO[hi]PYRROLO[2,1,5-cd]INDOLIZIN-4-ONE. A NOVEL TYPE OF PHENALENONE ANALOG
Authors: Noguchi Michihiko , Tanigawa Noriyuki , Tamamoto Takashi , Kajigaeshi Shoji
Published: July 2006

4H-Benzo[hi]pyrrolo[2,1,5-cd]indolizin-4-one, an analog of phenalenone, is obtained By a one-pot oxidation of 5,6-dihydro-4H-benzo[hi]pyrrolo[2,1,5-cd]indolizine with DDQ in aqueous dioxane. Its characteristic electronic feature is also described, which is different inherently from that of phenalenone or 3H-benz[cd]azulen-3-one.
PHOTOCHEMICAL REACTIONS OF α-METHYLSTYRENE INDUCED By Eu(III)/Eu(II) PHOTOREDOX SYSTEM IN METHANOL
Authors: Ishida Akito , Toki Susumu , Takamuku Setsuo
Published: July 2006

Photoirradiation of a methanol solution of α-methylstyrene and EUCl3·6H2O with Pyrex filter resulted in the formation of 2,3-dimethyl-2,3-diphenylbutane and 3,4-dimethyl-3,4-diphenylpentanol in high yields. This reaction was initiated By the excitation of Eu(III)–CH3OH CT-bands and followed By a successive photochemical reaction of Eu(II) ions formed.
STEREO- AND REGIOSELECTIVE SYNTHESIS OF HYDROXYCALAMENENES VIA (ARENE)TRICARBONYL CHROMIUM COMPLEXES
Authors: Uemura Motokazu , Isobe Kazuo , Hayashi Yuji
Published: July 2006

Stereoisomers of 7- and 8-hydroxycalamenenes were synthesized stereo- and regioselectively via (arene)tricarbony1 chromium complexes.
AN 18O-TRACER STUDY ON THE TiO2-SENSITIZED PHOTOOXIDATION OF AROMATIC COMPOUNDS
Authors: Takagi Katsuhiko , Fujioka Toshio , Sawaki Yasuhiko , Iwamura Hiizu
Published: July 2006

TiO2-sensitized photooxidation of benzenes has been studied to disclose the origin of the ring hydroxylating species. An 18O-tracer study using 18O2 gas revealed that the hydroxyl group of phenols comes essentially from molecular oxygen at higher pH region. At lower pH, however, the oxygen atom in phenols originates mostly from solvent water. These findings are compatible with two different mechanisms proposed By Osa et al. and Tokumaru et al.; that is, the major pathway changes with pH.
FORMATION OF ALLENYL CATIONS By PHOTOLYSIS OF TRIARYLCHLOROALLENES
Authors: Kitamura Tsugio , Miyake Sumiya , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Irradiation of triarylchloroallenes in methanol afforded 1,3,3-triaryl-3-methoxypropynes, suggesting the intervention of triarylallenyl cations. Irradiation of triphenylchloroallene in ethanol and 2-propanol gave the similar results but the irradiation in t-butyl alcohol gave only the products from triphenylallenyl radical.
X-RAY CRYSTAL STRUCTURES AND CONFORMATIONS OF 6β,12β-DIHYDROXY-3E,7E-D0LABELLADIENE 6-p-BROMOBENZOATE AND ACETOXYODONTOSCHISMENOL 3S,4S-EPOXIDE
Authors: Matsuo Akihiko , Yoshida Ken-ichiro , Uohama Katsumi , Hayashi Shûichi , Connolly Joseph D , Sim George A
Published: July 2006

The structures and conformations of 6β,12β-dihydroxy-3E,7E-dolabelladiene 6-p-bromobenzoate and acetoxyodontoschismenol 3S,4S-epoxide have been established By X-ray crystallographic analysis. The original assignment of the stereochemistry at C-12 of (+)-acetoxyodontoschismenol has been revised.
HEAT CAPACITIES FOR BINARY MIXTURES OF (ALCOHOL + NON-POLAR LIQUID) AT 298.15 K
Authors: Tanaka Reiji , Toyama Satoru , Murakami Sachio
Published: July 2006

The heat capacities for the binary mixtures of (n-CnH2n+1OH + n-C7H16) for n=1–6, and (n-C4H9OH + C6H6) have been determined at 298.15 K. A sharp and high peak appears in the partial molar heat capacities of alcohol, Cp,1, in the heptane solution at a high dilution of alcohol. The values Cp,1∞, at the infinite dilution and Cp,1* at the pure state change linearly with n of alcohol. The results are related to the self-association of alcohol in the mixture.
INFRARED STUDY OF INTERMEDIATES IN PROPYNE OXIDATION ON ZnO USING [18O2]OXYGEN AND DINITROGEN OXIDE
Authors: Nakajima Takashi , Miyata Hisashi , Kubokawa Yutaka
Published: July 2006

The oxidation of propyne on ZnO by 18O2 and N2O has been studied by IR spectroscopy. The lattice oxygen participates in the formation of diketone-like species and that adsorbed oxygen forms ketene-like species. No formate species is formed in the oxidation by N2O.
POLYMERIZED LIPOSOME AS THE CARRIER OF HEME. A PHYSICALLY STABLE OXYGEN CARRIER UNDER PHYSIOLOGICAL CONDITIONS
Authors: Tsuchida Eishun , Hasegawa Etsuo , Matsushita Yoh-ichi , Eshima Kiyoshi , Yuasa Makoto , Nishide Hiroyuki
Published: July 2006

By incorporating the lipid-heme in the polymerized liposome, conc. and mechanically stable heme solution ([heme] = 10 mM) was prepared; this solution (100 ml) could bind molecular oxygen (ca. 23 ml) reversibly under physiological conditions even in a high speed flowing system.
USE OF 3,4-DIMETHOXYBENZYL GROUP AS A PROTECTING GROUP FOR THE 2′-HYDROXYL GROUP IN THE SYNTHESIS OF OLIGORIBONUCLEOTIDES
Authors: Takaku Hiroshi , Ito Tsunehiko , Imai Kazuaki
Published: July 2006

The 3,4-dimethoxybenzyl group was introduced to the 2′-hydroxyl group by the reaction of nucleosides with 3,4-dimethoxybenzyl trichloroacetimidate or 3,4-dimethoxybenzyl bromide-NaH. Further, this group can be used as a protecting group for the O6-amide group of the guanine residue. The protected nucleosides are useful starting materials for the synthesis of oligoribonucleotides. The 3,4-dimethoxybenzyl group was removed rapidly from the oligoribonucleotides by treatment with oxidizing agents without any damage to the glycosidic bonds.
SYNTHESIS OF AZULENO[1,2-b]PYRROLE AND AZULENO[1,2-b]FURAN
Authors: Fujimori Kunihide , Fukazawa Hiroyuki , Nezu Yasuhiko , Yamane Kameji , Yasunami Masafumi , Takase Kahei
Published: July 2006

New heterocyclic compounds, methyl 1,2-dihydroazuleno[1,2-b]pyrrole-9-carboxylate, its [1,2-c] isomer, and the furan analogues are synthesized by the reaction of 3-methoxycarbonyl-2H-cyclohepta[b]furan-2-one with morpholino enamines of N-ethoxycarbonyl-3-oxopyrrolidine or 3-oxotetrahydrofuran. By the dehydrogenation of the resulting [1,2-b] isomers followed by demethoxycarbonylation, azuleno-[1,2-b]pyrrole and azuleno[1,2-b]furan are obtained, respectively.
THE RING STRAIN ENERGIES OF CYCLOPOLYSILANES, [R1R2Si]n (n=3–6)
Authors: Watanabe Hamao , Shimoyama Hiromi , Muraoka Tsutomu , Okawa Tadashi , Kato Motohiko , Nagai Yoichiro
Published: July 2006

Approximate estimation for the ring-strain energies of peralkylcyclopolysilanes, [R1R2 Si]n where n = 6, 5, 4, and 3, gave ΔΔE = 0, 6, 23, and 41 kcal·mol−1, respectively.
Cobaltocene Electrode Films Prepared by Electropolymerization of [Co(C5H4CCl=CHCHO)2]PF6
Authors: Nishihara Hiroshi , Aramaki Kunitsugu
Published: July 2006

A new cobalticinium salt [Co(C5H4CCl=CHCHO)2]PF6 gives electroactive films on electrode surfaces by electroreduction in n-Bu4NI–MeCN and the formed films act as a one-way charge-carrier for the redox reactions of solution species.
Preparation of Optically Active (4aα,8aβ)-Octahydro-4a-methyl-8-methylene-2(1H)-naphthalenone, a Key Intermediate for the Enantioselective Synthesis of Eudesmane Sesquiterpenes
Authors: Utaka Masanori , Fujii Yasuyuki , Takeda Akira
Published: July 2006

The titled optically active methylene ketone was prepared in 45% ee from 3-methyl-1,2-cyclohexanedione by use of a novel asymmetric Michael addition with (R,R)-(−)-2,3-butanediol as chiral auxiliary.
Crystal and Electronic Structures of δ-(BEDT-TTF)2AuI2
Authors: Kobayashi Akiko , Kato Reizo , Kobayashi Hayao , Tokumoto Madoka , Anzai Hiroyuki , Ishiguro Takehiko
Published: July 2006

The semiconducting salt of δ-(BEDT-TTF)2AuI2 crystallizes in the orthorhombic system with the lattice constants of a=6.802(2), b=14.822(8), c=33.387(9) Å. The BEDT-TTF molecules form a two-dimensional network parallel to (001). The origin of the semiconducting properties was discussed.
Isolation and Structures of Citreovirenone and Citreovirone
Authors: Shizuri Yoshikazu , Nagahama Masaharu , Yamamura Shosuke , Kawai Kazuaki , Kawai Noriaki , Furukawa Hideyuki
Published: July 2006

Two new metabolites (citreovirenone and citreovirone) have been isolated from the mycelium of Penicillium citreo-viride B. (IFO 4692) and their structures have also been elucidated on the basis of their spectral data coupled with some chemical evidence.
INCLUSION PROPERTIES OF N,N,N′,N′-TETRACYCLOHEXYLFUMARAMIDE AND CRYSTAL STRUCTURE OF ITS 1:1 MOLECULAR COMPLEX WITH ETHANOL
Authors: Toda Fumio , Tagami Yasunori , Mak Thomas C W
Published: July 2006

The title host compound forms crystalline inclusion complexes with a wide variety of alcohols- X-Ray analysis of its 1:1 ethanol complex showed that the crystal comprises a packing of a hydrogen-bonded guest···host···guest aggregate and a discrete host molecule, each of which occupy a different crystallographic center of symmetry.
Oxidative Esterification of Ethanol over Oxide Catalysts
Authors: Wang Lianchi , Eguchi Koichi , Arai Hiromichi , Seiyama Tetsuro
Published: July 2006

Oxidative esterification of ethanol has been studied over various oxide catalysts. Acetaldehyde was easily formed by oxidative dehydrogenation, and reacted further with remained ethanol and oxygen to produce ester. Among single oxides, Bi2O3, MoO3, and Sb2O4 showed the highest selectivity and yield for ethyl acetate formation, respectively. The ethyl acetate yield was highest and complete oxidation was extremely low over MoO3–Sb2O4 system.
Palladium-Catalyzed Regio- and Stereoselective Reduction of Allylic Compounds with LiHBEt3. Application to the Synthesis of Co-enzyme Q10
Authors: Mohri Mitsunobu , Kinoshita Hideki , Inomata Katsuhiko , Kotake Hiroshi , Takagaki Hidetsugu , Yamazaki Keiji
Published: July 2006

Regio- and stereoselective desulfonylation of allylic sulfones with LiHBEt3 in the presence of a catalytic amount of [PdCl2(dppp)] was successfully applied to the synthesis of co-enzyme Q10. It was found that this reduction system was applicable to a wide variety of allylic functional groups.
Magnetic Anisotropy of a Cast Multibilayer Film Containing a Cu(II)/Bilayer Complex
Authors: Ishikawa Yuichi , Tsukamoto Masashi , Kunitake Toyoki
Published: July 2006

A cast film was prepared from an aqueous mixture of azobenzene-containing, single-chain amphiphiles with the ammonium and Cu(II)-cyclam (1,4,8,11-tetraazacyclotetradecane) head groups. Esr spectra showed the magnetic anisotropy of the film due to the regular orientation of the component amphiphiles.
ISOLATION AND X-RAY CRYSTAL STRUCTURES OF THE 1:1 COMPLEXES OF Pt(or Pd)Cl2 WITH POLYTHIA[n](1,1′)RUTHENOCENOPHANES AND RELATED COMPOUNDS
Authors: Akabori Sadatoshi , Sato Sadao , Tokuda Takehiko , Habata Yoichi , Kawazoe Kayoko , Tamura Chihiro , Sato Masaru
Published: July 2006

Platinum or Palladium dichloride coordinated to polythia[n](1,1′)ruthenocenophanes, forming the crystalline 1:1 adducts. X-Ray crystallography of the complexes of the 1,4,7,10-tetrathia[n]ruthenocenophane with PtCl2 and PdCl2 revealed that the Pt(or Pd)Cl2 bonded selectively to the two S atoms among four S atoms of the ligand with a slightly distorted cis square-planer configuration.
Characterization of Fe Supported Y Type Zeolite by Using ESR and FT-IR
Authors: Hidaka Setsuo , IIno Akira , Mibuchi Takeharu , Nita Kenji , Yamazoe Noboru
Published: July 2006

Spectroscopic investigation using ESR and FT-IR was made on Fe supported Y type zeolite prepared by treating NH4Y zeolite with a ferric nitrate solution. Superparamagnetism of ESR signal indicated the existence of super fine particles of ferric oxide, while FT-IR measurements suggested small cluster ions containing Fe3+ bonded to zeolite lattice. The formation of such small particles was considered to proceed cooperatively with dealumination.
Synthesis and Conformational Behavior of Syn- and Anti-8-methoxycarbonyl-(Z)-[6]paracycloph-3-enes
Authors: Tobe Yoshito , Kaneda Teruhisa , Kakiuchi Kiyomi , Odaira Yoshinobu
Published: July 2006

Syn- and anti-8-methoxycarbonyl-(Z)-[6]paracycloph-3-enes were synthesized and the barrier for the conformational inversion of the bridge was determined to be ΔG≠(298)=103 kJ mol−1.
Effect of the Modification of the Heme Distal Side and of the Heme Propionates on the Reduction by Ascorbate of Metmyoglobin
Authors: Tsukahara Keiichi , Okazawa Tomoyuki , Yamamoto Yasuo
Published: July 2006

The modification of the heme distal histidylimidazole by cyanogen bromide or of the heme propionates to their methyl esters accelerated the reduction rate by ascorbate of metmyoglobin compared with its native form, suggesting that the structural change of the iron site from hexa- to penta-coordination is an important factor.
Stereo- and Regiospecific Synthesis of Trisubstituted Alkenes via the Palladium-catalyzed Cross-coupling Reaction of Diisopropyl (E)-(1-Alkyl-1-alkenyl)boronates with Organic Halides
Authors: Satoh Makoto , Miyaura Norio , Suzuki Akira
Published: July 2006

The reaction of diisopropyl (Z)-(1-bromo-1-alkenyl)boronates readily obtainable, with organolithiums and bases takes place readily to give (E)-(1-organo-1-alkenyl)boronates, the cross-coupling of which with various organic halides proceeds smoothly in the presence of Pd-catalyst and base to afford stereodefined trisubstituted alkenes in good yields.
Selective Synthesis of Ethylene from Synthesis Gas over Hybrid Catalyst System
Authors: Arakawa Hironori , Kiyozumi Yoshimichi , Suzuki Kunio , Takeuchi Kazuhiko , Matsuzaki Takehiko , Sugi Yoshihiro , Fukushima Takakazu , Matsushita Shoushirou
Published: July 2006

Selective synthesis of ethylene from synthesis gas has been investigated by using a hybrid catalyst system which was composed of an ethanol synthesis catalyst and zeolite as a dehydration catalyst. Ethylene was produced with a 45% selectivity from synthesis gas by the combination of Rh–Ti–Fe–Ir/SiO2 catalyst and H-Silicalite catalyst.
Photochemical and Chemical Reduction of Nitroalkenes Using Viologens as an Electron Phase-Transfer Catalyst
Authors: Tomioka Hideo , Ueda Koichi , Ohi Hirofumi , Izawa Yasuji
Published: July 2006

An amphiphilic electron acceptor, i.e., N,N′-dioctyl-4,4′-bipyridinium, was used as an electron carrier between water–oil two phases, in which nitroalkenes in organic phase were readily reduced to the corresponding oximes and/or carbonyl compounds.
Raman Spectra of Li2O–SiO2 Glasses Prepared by Rapid Quenching
Authors: Tatsumisago Masahiro , Minami Tsutomu , Umesaki Norimasa , Iwamoto Nobuya
Published: July 2006

Raman spectra were measured of rapidly quenched Li2O–SiO2 glasses containing high Li2O concentrations. The proportions of SiO4 tetrahedral units with different numbers of non-bridging oxygen atoms per a silicon atom were determined for these glasses. It was found that silicates in the glass with the highest Li2O content (63 mol% Li2O) consist of large amounts of isolated SiO44− and Si2O76− ions.
Facile Formation of Semi-Reduced Radicals of cis-N,N′-Diacylindigos by Visible-Light-Induced One-Electron Transfer from Tertiary Amines
Authors: Setsune Jun-ichiro , Fujiwara Takashi , Murakami Kazutoshi , Mizuta Yasufumi , Kitao Teijiro
Published: July 2006

N,N′-Oxalyl and N,N′-malonyl derivatives of indigo and 6,6′-di-t-butylindigo were reduced with high quantum efficiencies to their semi-reduced radicals by visible light irradiation in the presence of tertiary amines. These semi-reduced radicals were reversibly autoxidized and thus oxidative dealkylation of tertiary amines was catalyzed photochemically by these indigos.
Depth-distribution of Fluorescent Species in Silk Fabrics as Revealed by Total Internal Reflection Fluorescence Spectroscopy
Authors: Kurahashi Akihiko , Itaya Akira , Masuhara Hiroshi , Sato Masanori , Yamada Takashi , Koto Chise
Published: July 2006

Fluorescence spectra of silk woven fabrics with and without dyes, carthamin and berberin, were measured by using an excimer laser as an excitation pulse. Examining the results obtained with excitation under total internal reflection and normal conditions, a depth-distribution of fluorescent dyes in the silk was considered.
A New Treatment of Sewage Sludge by Direct Thermochemical Liquefaction
Authors: Suzuki Akira , Yokoyama Shin-ya , Murakami Masanori , Ogi Tomoko , Koguchi Katsuya
Published: July 2006

A new treatment of sewage sludge was developed. When sewage sludge was treated with sodium carbonate under pressure of nitrogen at above 300 °C, heavy oils were obtained in sufficiently high yields. Energy balance is briefly discussed, showing this method is feasible in terms of input/output energy ratio.
A Stereospecific Synthesis of β-Glycosides of N-Acetylneuraminic Acid and Secondary Alcohols
Authors: Okamoto Kaoru , Kondo Tadao , Goto Toshio
Published: July 2006

Glycosylation of secondary alcohols such as cholesterol, methyl 2,4,6-tri-O-benzylgalactopyranoside, and 2-deoxy-2,3-dehydro-NeuAc methyl ester with a new glycosyl donor, 2β,3α-dibromo-2-deoxy-NeuAc methyl ester, selectively gave the corresponding β-glycosides in high yields. The 3α-bromo-glycosides were debrominated with tri-n-butylstannane to the corresponding glycosides, which were deprotected to give the free glycosides having a β-NeuAc.
Transition Metal Phosphine Complexes Possessing a Phase Transfer Function. Preparation and Catalytic Reactivity of Palladium Phosphine Complexes Containing Crown Ethers
Authors: Okano Tamon , Iwahara Masahiro , Suzuki Takayoshi , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

Crown-functionalized triarylphosphines and their palladium complexes were synthesized and characterized. The palladium complexes were found to fulfil the concerted function of the transition metal catalyst and the phase transfer catalyst in the two-phase reduction of 1-chloromethylnaphthalene with formate salts.
Thermolysis of Dimethylgold(III) Complexes Having a Nucleoside Ligand
Authors: Mizuno Yuuko , Komiya Sanshiro
Published: July 2006

Relative ease of dissociaiton of nucleosides from dimethylgold(III) complexes, estimated from the kinetics of thermolysis of dimethylgold(III) complexes having a nucleoside ligand, AuMe2(nucleoside)X, lies in the order of Cyd <Guo <Ado<<dThd.
Misakinolide-A, an Antitumor Macrolide from the Marine Sponge Theonella Sp.
Authors: Sakai Ryuichi , Higa Tatsuo , Kashman Yoel
Published: July 2006

A highly active antitumor macrolide, misakinolide-A has been isolated from the sponge Theonella sp. The gross structure was determined by extensive NMR studies including homo- and heteronuclear COSY experiments.
Fourier Transform Spectroscopy on the ν1 Band of OCSe
Authors: Sueoka Kazuo , Konno Toichi , Hamada Yoshiaki , Uehara Hiromichi
Published: July 2006

The ν1 fundamental band of OCSe in natural abundance was observed near 2000 cm−1 with a resolution of 0.005 cm−1. Results of the analysis are given for 16O12C80Se and 16O12C78Se.
Synthesis of Pyrrolizidinediones from Cyclic N,N-Diacylamino Acids
Authors: Bestmann Hans Jürgen , Moenius Thomas , Soliman Fouad
Published: July 2006

Cyclic N,N-diacylami no acids can be converted by reaction with N-phenylketeniminylidenetriphenylphosphorane into pyrrolizidinediones.
A Convenient Method for the Hydrolysis of Diethylthioacetals Catalyzed by Trityl Perchlorate
Authors: Ohshima Masahiro , Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

Treatment of diethylthioacetals with two equivalents of trityl methyl ether in the presence of a catalytic amount of trityl perchlorate, and successive quenching with aqueous sodium hydrogencarbonate gave parent carbonyl compounds, hydrolyzed products, in high yields under mild conditions. According to this method, it is also possible to hydrolyze diethylthioacetals selectively even when another thioacetal, such as 1,3-dithiane, coexisted in the same molecule.
Transition Metal Ketene Complexes as Active Intermediate for Catalytic Carbonylation of Geminal Dibromoalkanes
Authors: Miyashita Akira , Kihara Takehiro , Nomura Kotohiro , Nohira Hiroyuki
Published: July 2006

MX2(PPh3)2 (M= Ni, Pd, Pt; X= Cl, Br) and Co2(CO)8 catalyze alkoxy- and aminocarbonylation of geminal dibromoalkanes, R1R2CBr2 (R1, R2= H and CH3). In the course of the catalysis, initial formation of the transition metal ketene complexes, M(CH2=C=O)L2, was followed by the reaction with alcohols to yield carbalkoxymethyl metal intermediate leading to esters.
Lead-Promoted Allylation of Carbonyl Compounds with Allyl Bromide
Authors: Tanaka Hideo , Yamashita Shiro , Hamatani Takeshi , Ikemoto Youichi , Torii Sigeru
Published: July 2006

A lead-promoted allylation of carbonyl compounds with allyl bromide in a Pb/Bu4NBr/Me3SiCl/DMF system has been performed in good yields with high chemoselectivities: RCHO > R1R2CO > R1CH(OH)CO2R2>> R1CO2R2, lactone, (RCO)2O, and RCOCl.
Substituent Effects on the Populations of Rotational Isomers in 9-(Aryloxymethyl)-1,4-dimethyltriptycenes. Implications for the Presence of CH3···O Hydrogen Bond
Authors: Tamura Yoshio , Yamamoto Gaku , Oki Michinori
Published: July 2006

The population ratios ±sc/ap in 9-(aryloxymethyl)-1,4-dimethyltriptycenes were determined by 1H NMR spectroscopy. Whereas electron-withdrawing substituents favor the ap rotamer, electron-donating substituents favor the ±sc rotamer in a relative sense. The results are attributed to the presence of weak CH3···O intramolecular hydrogen bond in the ±sc form.
Cyclodimerization of Benzylideneacetophenone and Its Derivatives by Use of Triiron Dodecacarbonyl
Authors: Ueda Tatsuo , Otsuji Yoshio
Published: July 2006

The reaction of benzylideneacetophenone and its derivatives with Fe3(CO)12 in refluxing toluene gives 1-aroyl-2,4,5-triarylcyclopentene derivatives via (η4-enone)tricarbonyliron complexes. The mechanistic feature of this reaction is presented.
Formation of an Oxirane by the Reaction of 9-Diazofluorene with 2,3-Dichloro-5,6-dicyanobenzoquinone and Inclusion of Some Solvents in the Oxirane
Authors: Shingaki Tadao , Tsujita Mitsuji , Nagai Toshikazu
Published: July 2006

Reaction of 9-diazofluorene with 2,3-dichloro-5,6-dicyanobenzoquinone gave an oxirane. It was found that the oxirane formed 1 : 1 molecular complexes with solvents on recrystallizing from some solvents such as acetone, acetonitrile, 1,4-dioxane, and benzene.
Insertion Reactions of Dimethylgermanone [(CH3)2Ge=O] into Si–O and Si–Cl Bonds
Authors: Kang Kyung-Tae , Manuel Georges , Weber William P
Published: July 2006

Flash vacuum co-pyrolysis (FVP) of 3,3-dimethyl-6-oxa-3-germabicyclo[3,1,0]hexane with various trapping reagents has been carried out. Adducts which result from insertion of dimethylgermanone into Si–O and Si–Cl bonds have been outlined.
Synthesis of 3,5-Bis(2,5,8-trioxaeicosyl)-18-crown-6 and Its Formation of Bilayer Membranes
Authors: Gu Xue-Ping , Ikeda Isao , Okahara Mitsuo , Kim Jeman
Published: July 2006

Dialkyl crown ether (4) containing oligooxyethylene group which can be dispersed in water to form a stable opalescent solution by sonication was synthesized. Transparency of the aqueous solution of 4 was enhanced by the addition of KCl, showing the salt-in effect. Electron microscopy suggested that 4 forms the myelin-like fingerprint structure and vesicle-like aggregates.
One-step Synthesis of Straight-chain Carbohydrates from Formaldehyde and Syngas
Authors: Okano Tamon , Ito Hideo , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

Straight-chain carbohydrates such as trioses, tetroses, pentoses, and hexoses are readily obtained in good yields by a reaction of formaldehyde with syngas in the presence of RhCl(CO)(PPh3)2 and tertiary amine. A selective synthesis of trioses or tetroses is also described.
A Photoallylation of N-Methylarenedicarboximides by Allylsilanes
Authors: Kubo Yasuo , Imaoka Takayuki , Shiragami Tsutomu , Araki Takeo
Published: July 2006

The photoallylation of N-methylarenedicarboximides by allylsilanes in acetonitrile or methanol efficiently occurred at a carbonyl carbon atom and at an aromatic carbon atom possibly via single electron transfer.
SYNTHESIS OF A NEW PHOSPHORUS-FUNCTIONALIZED NITRILE OXIDE, α-(DIETHYLPHOSPHONO)ACETONITRILE OXIDE, AND CYCLOADDITION LEADING TO 3-(DIETHYLPHOSPHONOMETHYL)-Δ2-ISOXAZOLINES
Authors: Tsuge Otohiko , Kanemasa Shuji , Suga Hiroyuki
Published: July 2006

Cycloaddition of α-(diethylphosphono)acetonitrile oxide, a new phosphorus-functionalized nitrile oxide, leads to 3-phosphonomethyl-Δ2-isoxazolines which are useful as Δ2-isoxazoline unit-introducing reagents.
Contribution of Scalar Coupling Pathway in the Relaxation of Germane and Tetrahalogermanes
Authors: Harazono Toshie , Tanaka Katsumi , Takeuchi Yoshito , Kakimoto Norihiro
Published: July 2006

73Ge relaxation in GeH4, GeCl4, and GeBr4, and 1H relaxation in GeH4 have been studied, and found to contain a scalar coupling mechanism in a spin-spin relaxation. Furthermore, a scalar spin coupling constant, J(73Ge–35Cl) = 24Hz, was obtained.
Photochemical Rearrangement of 2-Substituted 4-Alkylidene-2,3-epoxy-1-tetralone to 3-(2-Oxoalkylidene)-1-indanone
Authors: Maruyama Kazuhiro , Osuka Atsuhiro , Nakagawa Katsuhiko , Tabuchi Kenzo , Shimizu Hirohito , Suzuki Hitomi
Published: July 2006

Irradiation of 2-substituted 4-alkylidene-2,3-epoxy-1-tetralone results in the rearrangement to 3-(2-oxoalkylidene)-1-indanone or the E-Z isomerization around the double bond. These photoreactions are suggested to occur from the (π,π*) triplet excited state.