bluuebunny/crossref_metadata_2025 huggingface dataset:
Oxidation of Aromatic Olefins Catalyzed by Diaryl Ditellurides
Authors: Kambe Nobuaki , Fujioka Toyozo , Ogawa Akiya , Miyoshi Noritaka , Sonoda Noboru
Published: July 2006

Diaryl ditellurides were found to have unique catalytic activity for oxidation of aromatic olefins with a variety of oxidizing reagents in methanol or in acetic acid to give vic-dimethoxyl or vic-diacetoxyl compounds, respectively. Molecular oxygen (or air) as well as organic peroxides and peracids can be employed as the oxidizing reagents in this new oxidation system.
Total Synthesis of (±)-Furodysin and (±)-Furodysinin
Authors: Hirota Hiroshi , Kitano Masafumi , Komatsubara Ken-ichi , Takahashi Takeyoshi
Published: July 2006

Furodysin and furodysinin, marine origin furanosesquiterpenes having a unique carbocyclic ring system, have been first synthesized as racemic forms from a cis-decalone derivative.
Direct Chain Elongation of N-Carbamoylpyroglutamate. An Efficient Synthesis of (−)-Pyrrolidine-2,5-Dicarboxylic Acid
Authors: Ohta Tomihisa , Hosoi Akio , Kimura Toshihiko , Nozoe Shigeo
Published: July 2006

(−)-Pyrrolidine-2,5-dicarboxylic acid, an acidic amino acid component of marine red alga Schizymenia dubyi, has been synthesized with a direct chain elongation reaction of N-carbamoylpyroglutamates at C-5 and a pyrrolidine ring formation.
A Formal Synthesis of Aplasmomycin. Assembly of the C3–C17 Segment Based on Remote Controlled Asymmetric Reductions
Authors: Matsuda Fuyuhiko , Tomiyosi Nobuya , Yanagiya Mitsutoshi , Matsumoto Takeshi
Published: July 2006

The C3–C17 segment of a boron containing ionophoric antibiotic aplasmomycin (1), the key intermediate in Corey’s total synthesis of 1, was stereoselectively synthesized in an optically active form through remote controlled asymmetric reductions.
Preferential Electrocyclic Reaction of o-Quinodimethane. New Route to Dihydronaphthalenes and Naphthalenes
Authors: Shishido Kozo , Yamashita Akitake , Hiroya Kou , Fukumoto Keiichiro , Kametani Tetsuji
Published: July 2006

Substituted dihydronaphthalenes and naphthalenes are obtained via a preferential electrocyclic reaction of o-quinodimethanes generated by the thermolysis of 1-alkyl-1-alkenylbenzocyclobutenes.
Incorporation of Dye Molecules in Polypyrrole Films in the Process of Photoelectrochemical Deposition
Authors: Okano Mitsutoshi , Itoh Kiminori , Fujishima Akira
Published: July 2006

Dye molecules were incorporated in polypyrrole films in the process of photoelectrochemical deposition. The concentration of the incorporated dyes depended on the charge of dye molecules and it was 5.1 mol dm−3 for Sodium Fluorescein and 1.3 mol dm−3 for Rose Bengal. Anionic dyes were most easily incorporated in the films.
Preparation of Enamides via Reductive Acylation of N-Acetoxyimino Compounds by Use of Fe3(CO)12
Authors: Nakanishi Saburo , Hirano Takehiro , Otsuji Yoshio , Itoh Keiji
Published: July 2006

Treatment of N-acetoxyimino compounds with Fe3(CO)12 in the presence of acyl halides and triethylamine gave enamides in good yields.
Porous and Electrically Conducting Clay-Carbon Composite as Electrode of Electric Double-Layer Capacitor
Authors: Kanbara Takaki , Yamamoto Takakazu , Tokuda Koichi , Aoki Koichi
Published: July 2006

Porous and electrically conducting clay-carbon composite, which is produced by sintering of mixtures of clay and porous carbon, shows large electrostatic capacitance (ca. 10 F cm−3). By using the composites, electric double-layer capacitors with capacitance of 2.3–3.4 F/(cm3 of the capacitor) have been prepared.
1-Methoxyl Participation vs. Skeletal Rearrangement in Diazotization of 9-Aminomethyl-1,4-dimethoxytriptycene
Authors: Yamamoto Gaku , Oki Michinori
Published: July 2006

The title reaction with nitrous acid in acetic acid gave 10-acetoxy-6,9-dimethoxyhomotriptycene (29%) and 9-chloromethyl-1,4-dimethoxytriptycene (20%) as major products, suggesting participation of the 1-methoxyl group or the C9–C8a bond depending on the rotational state of the diazonium ion.
Unusually High Oxidation Potentials of Di- and Trichalcogena[3]-ferrocenophanes
Authors: Ushijima Hirobumi , Akiyama Takeo , Kajitani Masatsugu , Shimizu Kunio , Aoyama Masahide , Masuda Shigeru , Harada Yoshiya , Sugimori Akira
Published: July 2006

1,2,3-Trichalcogena[3]-ferrocenophanes (1: E=S , 2: E=Se) and 1,3-dithia[3]-ferrocenophane show unusually high oxidation potentials compared to non-bridged 1,1′-bis(methylthio)ferrocene and methylene-bridged [3]-ferrocenophane. The photoelectron spectrum of 1 shows that the d-electrons of Fe are attracted by sulfur bridge.
Porphyrin as a Reagent of New Indicator Reaction for the Catalytic Determination of Ultra Trace Amounts of Ruthenium(III)
Authors: Kawamura Kunio , Igarashi Shukuro , Yotsuyanagi Takao
Published: July 2006

A new function of porphyrin as an analytical reagent for an indicator reaction has been developed. The decomposition rate of porphine ring with oxidizing agent was accelerated in the presence of ultra trace amounts of metal ions, such as ruthenium(III). Based on these finding, the highly selective and sensitive method for trace amounts of ruthenium(III) was developed. Its determination limit was reached down to 10−10 mol dm−3 level.
Synthesis of (2S,3S,5S)-3-Hydroxy-5-methyl-2-pyrrolidinecarboxylic Acid, a Component of Actinomycin Z1
Authors: Fushiya Shinji , Chiba Hiroyuki , Otsubo Akihiro , Nozoe Shigeo
Published: July 2006

(2S,3S,5S)-3-Hydroxy-5-methyl-2-pyrrolidinecarboxylic acid and the enantiomer, the relative configurations of which are the same as that of the natural compound found in actinomycin Z1 were synthesized and the optical properties were determened.
Perkin–Markovnikov Type Reaction Initiated with Electrogenerated Superoxide Ion
Authors: Ojima Fumihiro , Matsue Tomokazu , Osa Tetsuo
Published: July 2006

The cyclic condensation of α,ω-dihaloalkanes with activated methylene of malonic acid and acetoacetic acid esters is studied using an electrogenerated superoxide ion. Two possible mechanisms for this reaction are postulated.
Reactions of 1,1-Diphenylethylene and Its Derivatives with Tris(p-bromophenyl)aminium Hexachloroantimonate
Authors: Kim Kwan Soo , Son Se Hwan , Joo Yung Hyup , Jung Dai Il , Hahn Chi Sun
Published: July 2006

Reaction of 1,1-diphenylethylene (1) with(p-BrC6H4)3N\overset+·SbCl6− produced indan dimer 2 in dried solvents and gave a butadiene derivative 7 and a tetrahydrofuran derivative 8 in wet solvents whereas the dimerization of the derivatives of 1 afforded cyclobutane type dimers and butadiene type dimers.
Electronic Structural Characterization of Cycloheptadienequinone and Cyclopentenequinone Systems on the Models of 2,3,4,5-Dibenzo-7,8-diphenylheptatriafulvalene-1,6-quinone and 5,6-Diphenylcalicene-1,4-quinone
Authors: Namekata Norio , Takase Kahei , Takahashi Kazuko
Published: July 2006

The title heptatriafulvalene- and calicene-quinones have been synthesized. The difference in the degree of the charge separation between these quinones has been ascribed to the increasing contribution of pseudo 6π and 4π electron peripheries in the 7- and 5-membered rings to the respective polarized canonical structures.
Enhanced Stabilization Reactivity of Coal Tar Based Mesophase Pitch Fiber by Blending PVC Pitch
Authors: Mochida Isao , Toshima Hiroshi , Korai Yozo , Matsumoto Tadayuki
Published: July 2006

PVC pitch prepared at 420 °C for 2 h was blended into a coal tar based mesophase pitch to enhance the stabilization reactivity of the whole pitch fibers. No deterioration of spinnability was recognized after the blending, suggesting their high compatibility. The oxidative stabilization in the air at 270 °C took 120 min for the stabilization of the parent mesophase pitch fibers to maintain its fiber form during the carbonization up to 600 °C, while the pitch fibers from the blends with PVC pitch in 5 or 10 wt% took 80 min to be stabilized. Blended PVC pitch is supposed to be oxidized more easily to react with coal tar derived molecules, enhancing the stabilization reactivity of the whole fiber.
Acyl Transfer Reaction Catalyzed by Cu2+ Ion Complex of a Lipophilic Hydroxyimidazole-ligand in AOT Reverse Micelles. Effects of Change of Core Solvent from Water to DMF
Authors: Fujita Tsunehisa , Minami Hajimu , Ogino Kenji , Tagaki Waichiro
Published: July 2006

The transfer of acyl group of p-nitrophenyl picolinate to alcohol acceptors has been investigated kinetically in AOT reverse micelles using hexane and DMF as the bulk and the core solvents, respectively. The reaction was found to be remarkably catalyzed by a 1:2 complex of Cu2+ ion and N-dodecyl-2-hydroxymethylimidazole ligand involving the acylated ligand as the intermediate. It was also observed that the reaction in the reverse micelles was much faster than that in pure DMF.
Microbial Oxidation of Racemic vic-Diols Synthesis of (R)- and (S)-α-Hydroxypropiophenones
Authors: Ohta Hiromichi , Yamada Hiroshi , Tsuchihashi Gen-ichi
Published: July 2006

Both enantiomers of 2-hydroxy-1-phenyl-1-propanone have been synthesized by microbial oxidation of racemic syn-and anti-1-phenylpropane-1,2-diols, which are available from 1-phenylpropyne.
An Efficient Synthetic Method of Jasmone Analogues and 2,5-Dialkylpyrrolidine Alkaloids Using 1-Benzyl-2,5-dicyanopyrrolidine
Authors: Takahashi Kazumasa , Aihara Tetsuhito , Ogura Katsuyuki
Published: July 2006

Reaction of 1-benzyl-2,5-dicyanopyrrolidine with alkyl halides give unsymmetrical 2,5-dialkylated products (3) in high yields. Hydrolysis of 3 gives γ-diketones which serve as precursors for jasmone analogues having a cyclopentenone framework, while decyanation and debenzylation of 3 lead to 2,5-dialkylpyrrolidine alkaloids in high yields.
Synthesis of Both Enantiomers of Phoracantholide I, a Defensive Secretion of the Eucarypt Longicorn, Employing Asymmetric Reduction with Immobilized Baker’s Yeast
Authors: Naoshima Yoshinobu , Hasegawa Hidenobu
Published: July 2006

Highly enantiomerically pure (R)- and (S)-phoracantholide I were synthesized in relatively short steps starting from dietyl 3-oxoglutarate by means of an asymmetric reduction of the intermediate keto acid with immobilized baker’s yeast. The asymmetric reduction with the immobilized baker’s yeast gave greater facilities compared with the analogous reaction with free baker’s yeast.
Pronounced Hypsochromic Shift of Absorption Band and Improved Solubility of Bis(1,2-diaryl-1,2-ethylenedithiolato)nickels. Prospective Near-IR Dyes for Optical Data Storage
Authors: Shiozaki Hisayoshi , Nakazumi Hiroyuki , Nakado Yasuko , Kitao Teijiro
Published: July 2006

The introduction of halogen atoms at the 2-position in the benzene rings of bis(1,2-diaryl-1,2-ethylenedithiolato)nickel caused a pronounced hypsochromic shift of the absorption band in near-infrared region and improved the solubility to benzene. The nickel complexes with 2-halogen atoms are effective quenchers of singlet oxygen.
Conformational Behavior and Epoxidation of the Dolabella-3E,7E-dienoid
Authors: Matsuo Akihiko , Yoshida Ken-ichiro , Fukazawa Yoshimasa , Nakayama Mitsuru , Kuriyama Kaoru
Published: July 2006

Conformational analysis of the dolabellane diterpenoid, 6β-acetoxy-12β-hydroxydolabella-3E,7E-diene containing 1,5-undecadiene, has been achieved by means of molecular mechanics calculations, 1H NMR, and CD spectrometry. The epoxidation products of the diene can be rationalized in terms of the calculated equilibrium conformations.
Computer Assisted Bilateral Generation of Reaction Networks from Educts and Products
Authors: Fontain Eric , Bauer Johannes , Ugi Ivar
Published: July 2006

A computer program (FORTRAN 77 for IBM-PC) for generating reaction pathways between given educts and products of chemical reactions and their sequences is presented. This program is based on the theory of the BE- and R-matrices. Some applications to known chemical reactions are described as examples.
Triplet-State Excitation of 1-Indanone by Electron Impact
Authors: Inoue Akinori
Published: July 2006

Electron-impact-induced phosphorescence of 1-indanone was observed for the first time at low pressure. The mechanism of triplet-state formation of this molecule by electron-impact excitation was studied by measuring excitation energy dependence of the phosphorescence intensity.
Evidence for the Formation of π-Dianions of 9-Fluorenone and 10,11-Dihydro-5H-dibenzo[a,d]cyclohepten-5-one from 1H NMR and CNDO Charge Distributions
Authors: Hirayama Masatoshi , Suzuki Hideto , Ohhata Hiroshi
Published: July 2006

It was demonstrated on the basis of reactivity, 1H NMR and CNDO charge distributions that the π-dianions of 9-fluorenone and 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one were formed from the corresponding neutral precursors in contact with sodium or potassium in dimethoxyethane or tetrahydrofuran at low temperature in vacuo.
Fixation of Molecular Nitrogen in Aqueous Solution Induced by Nitrogen Arc Plasma
Authors: Takasaki Michiaki , Harada Kaoru
Published: July 2006

Argon Arc Plasma containing nitrogen gas (nitrogen arc plasma) was directly introduced into water, and a disproportionation reaction of molecular nitrogen took place in aqueous solution to form ammmonia, nitrous acid, and nitric acid. The redox reaction of molecular nitrogen is interesting on the chemical evolutionary point of view as a possible route for the formation of ammonia under non-reducing conditions.
An Essentially Mild and Efficient Catalyst System for the Activation of Carbonyl Compounds and Their Derivatives. The Combined Use of Trimethylsilyl Chloride and Tin(II) Chloride
Authors: Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

An essentially mild and efficient catalyst system, the combined use of trimethylsilyl chloride and tin(II) chloride, is effectively employed for the activation of acetals, aldehydes, orthoesters, and α,β-unsaturated ketones to accomplish the reaction with silyl enol ethers to give the corresponding addition products in good yields.
Synthesis and Characterization of Tellurocarboxylic Acid Salts and Bis(acyl) Ditellurides
Authors: Kakigano Takeaki , Kanda Takahiro , Ishida Masaru , Kato Shinzi
Published: July 2006

The reaction of bis(acyl) tellurides with primary or secondary amines or potassium ethanolate yielded the corresponding tellurocarboxylic acid salts, which are readily oxidized with iodine or benzenesulfonyl chloride to afford novel bis(acyl) ditellurides.
Unusual Chain Elongation at the Reversed Face in the Biosynthesis of (E,E)-Farnesol with the Enzyme System of Pisum sativum
Authors: Suga Takayuki , Zheng Rong-yu , Ohta Shinji , Yoshioka Takamitsu , Hirata Toshifumi
Published: July 2006

When (E,E)-farnesol was enzymatically synthesized from an equimolar mixture of 3,3-dimethylallyl pyrophosphate and (E)- or (Z)-[4-2H]isopentenyl pyrophosphate (IPP) in the presence of iodoacetamide with a farnesyl pyrophosphate synthetase fraction prepared from Pisum sativum, the unusual addition of allylic residue to the re-re, face of the carbon-carbon double bond of IPP was found to occur. This finding was the first example of the unusual chain elongation against Cornforth’s stereochemical picture for the biosynthesis of isoprenoids.
The θ-Type Cation Radical Salts of BMDT-TTF, Bis(methylenedithio)tetrathiafulvalene
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko
Published: July 2006

The molecular arrangement of BMDT-TTF in crystals of (BMDT-TTF) -X system (X=AuI2−, AuBr2−, and AsF6−) is quite similar to that in the organic superconductor θ-(BEDT-TTF)2I3. Their electronic properties are, however, different from those of θ-(BEDT-TTF)2I3.
Zirconacyclopropanes and Zirconacyclopropenes. Their Synthesis, Characterization, and Reactions
Authors: Takahashi Tamotsu , Swanson Douglas R , Negishi Ei-ichi
Published: July 2006

Zirconacyclopropenes represented by Cp2Zr(PhCCPh) (PR3) (4), where PR3 is PMe3 or PMePh2, have been prepared by the reaction of Cp2Zr(PR3)2 with PhC≡CPh, isolated as yellowish crystals, and spectroscopically characterized. Zirconacyclopropenes readily react with proton donors, carbonyl compounds, e.g., acetone, and alkynes to induce dimerization of alkynes and are likely intermediates in the ZrCp2-induced bicyclization of enynes.
Novel 3,4-Diarylpyrrolidine-Based Chiral Ligands for the Asymmetric Reaction of Arylmagnesium Bromides with Aldehydes
Authors: Tomioka Kiyoshi , Nakajima Makoto , Koga Kenji
Published: July 2006

Utilizing novel chiral diamine ligands, asymmetric addition of arylmagnesium bromides to aldehydes provided the corresponding carbinols in 40–75% ee.
An Efficient Synthesis of 15-Oxygenated T-Type Spirovetivanes. Its Application to the Synthesis of (±)-[8,8-2H2]Isolubimin
Authors: Murai Akio , Miyazaki Hiroshi , Watanabe Katsuyuki , Masamune Tadashi
Published: July 2006

(4RS,7RS)-11-Hydroxy-15-norsolavetivane, a versatile intermediate for the synthesis of all 15-oxygenated T-type spirovetivanes, has been synthesized with high stereoselectivity. The synthesis has also been applied to preparation of (±)-[8,8-2H2]isolubimin.
Isomerization of Quadricyclanes to Norbornadienes Induced by Silver(I) Catalyst
Authors: Maruyama Kazuhiro , Tamiaki Hitoshi
Published: July 2006

In the silver(I)-catalyzed isomerization of quadricyclanes (1) to norbornadienes(2) in benzene, silver(I) might attack 1 from the exo-side, resulting in the formation of the cationic intermediate to give 2.
Asymmetric [2,3]-Wittig Rearrangement Involving a Chiral Ester Enolate Terminus. A Chiral Synthesis of erythro-α-Hydroxy-β-alkyl Carboxylic Acid Derivatives
Authors: Takahashi Osamu , Mikami Koichi , Nakai Takeshi
Published: July 2006

The title rearrangement of the (E-2-alkenyloxy)acetic esters derived from (−)-8-phenylmenthol has been shown to afford the corresponding 3-alkyl-2-hydroxy-4-pentenoic ester with an extremely high level of diastereoface selection (95–97% de) along with a high erythro selectivity (90–93%).
Reversal of Pressure Effect on Thermal Z–E Isomerization of 4-(Dimethylamino)-4′-nitroazobenzene
Authors: Asano Tsutomu , Okada Toshio
Published: July 2006

It has been discovered that the kinetic effect of pressure on Z–E isomerization of 4-(dimethylamino)-4′-nitroazobenzene reverses at about 500 MPa in glycerol triacetate at 25 °C. At lower pressures, the rate increases with increasing pressure, but at higher pressures, it decreases rapidly with increasing pressure. The most probable reason for this reversed pressure effect is retardation of the intramolecular rotational movements by viscous interactions between the reactant and the solvent molecules.
β-Cyclodextrin–Epichlorohydrin Copolymers as Efficient Catalysts in Phase-Transfer-Catalyzed Nucleophilic Substitution Reactions
Authors: Tanaka Nobuo , Yamaguchi Atsumi , Araki Yoshio , Araki Mikio
Published: July 2006

Copolymers of β-cyclodextrin (β-CD) with epichlorohydrin showed much higher phase-transfer catalytic activity than β-CD in liquid–liquid two-phase nucleophilic displacement reactions. The enhanced efficiency of the polymer catalysts was attributed to the cooperative effect of more than one β-CD group in polymers in bringing a substrate from an organic phase to an aqueous phase.
Rate Controlling Role of the Aprotic Solvents in the Aromatic Nucleophilic Substitution Reaction and the Possible Intervention of a Substrate-Nucleophile Complex as an Intermediate of the Reaction
Authors: Hayami Jun-ichi , Otani Shinichi , Yamaguchi Fumio , Nishikawa Yasuharu
Published: July 2006

SNAr reactions of 1,2,3,5-tetranitrobenzene or 2,4,6-trinitrofluorobenzene with aromatic amines were studied in aprotic solvents by means of stopped-flow kinetic measurements. Base catalysis and negative activation enthalpy were observed in nonpolar solvents, which were ascribed to an intermediate encounter complex.
New Ferroelectric Liquid Crystal Materials. (+)-4-[(2-Methylbutyloxycarbonyl)phenyl]4-(5-Alkyl-1,3-dioxan-2-yl)benzoate
Authors: Haramoto Yuichiro , Kamogawa Hiroyoshi
Published: July 2006

(+)-4-(2-Methylbutyloxycarbonyl)phenyl 4-(5-alkyl-1,3-dioxan-2-yl)benzoate (9) and (+)-4-[(2-methylbutyloxy)phenyl]4-(5-alkyl-1,3-dioxan-2-yl)benzoate and corresponding dithianes and oxathianes were synthesized. Only compounds 9 exhibited the ferroelectric liquid crystal behavior (R=n-c11H23: −4 SmC 93 °C).
Fremy’s Salt Promoted Oxidative Degradation of p-Hydroxybenzylamines and p-Hydroxybenzamides. A Novel Approach to p-Quinones
Authors: Saa José M , Llobera Antonia , Deya Pedro M
Published: July 2006

p-Hydroxybenzylamines and primary p-hydroxybenzamides undergo oxidative degradation by the action of Fremy’s salt, thus providing p-benzoquinones in good yields.
The Mechanism of the Photocatalytic Dehydrogenation of Methanol
Authors: Ohno Masayuki , Uzawa Hisaji , Miyazaki Teruhisa , Tarama Kimio
Published: July 2006

We have studied on the mechanism of the photocatalytic dehydrogenation of methanol over Pt/TiO2. D2 was only evolved from CH3OD, and D2, HD, and H2 were detected in the evolved gas in the case of the mixed sample of CH3OD and CH3OH. These results show that the evolved hydrogen came from hydroxyl hydrogen atom of methanol. And the rate determining step was discussed in connection with comparison among the evolution rates of H2, HD, and D2, respectively.
Syntheses of All Four Possible Diastereomers of Etoposide and Its Aminoglycosidic Analogues via Optical Resolution of (±) -Podophyllotoxin by Glycosidation with d- and l-Sugars
Authors: Saito Hitoshi , Nishimura Yoshio , Kondo Shinichi , Umezawa Hamao
Published: July 2006

Syntheses of all four possible diastereomers of etoposide and its aminoglycosidic analogues have been achieved via optical resolution of (±)-podophyllotoxin by glycosidation with d- and l-sugars.
Regioselectivity in the 1,3-Dipolar Cycloaddition Reaction of Pyridinium Dicyanomethylides with Unsymmetric Alkynes
Authors: Matsumoto Kiyoshi , Uchida Takane , Konishi Hideyuki , Watanabe Youko , Aoyama Kinuyo , Asahi Momoyo
Published: July 2006

Representative pyridinium dicyanomethylides underwent regioselectively 1,3-dipolar cycloaddition onto methyl 3-trimethylsilyl-2-propynate and methyl 3-phenyl-2-propynate yielding the corresponding indolizines whereby 1-methoxycarbonylindolizines forms either exclusively or predominantly, in agreement with HOMO(ylide)–LUMO(dipolarophile) interaction as revealed by CNDO/2 calculation.
Photochemistry of Arenedicarboxylic Thioanhydride. Insertion of Alkene into C(=O)–S Bond of 1,2- and 2,3-Naphthalenedicarboxylic Thioanhydride
Authors: Kubo Yasuo , Okusako Kensen , Araki Takeo
Published: July 2006

Irradiation of 1,2-naphthalenedicarboxylic thioanhydride (5a) or its 2,3-isomer with alkenes in acetonitrile gave naphthothiepindiones by insertion of alkenes into C(=O)–S bond of the thioanhydride. Reactions of 5a with cis- and trans-2-butene were stereospecific, demonstrating that the insertion was caused from the singlet excited state of 5a.
Ethylene Formation from 1-Aminocyclopropanecarboxylic Acid by the Reaction of Molecular Oxygen and Dihydropyridine Mediated by Flavin Mononucleotide and Mn(II) Ion
Authors: Okamoto Tadashi , Shimada Mikio , Oka Shinzaburo
Published: July 2006

Oxidation of 1-aminocyclopropanecarboxylic acid by O2 in the presence of 1-benzyl-3-carbamoyl-1,4-dihydropyridine, Mn(II) ion, and flavin mononucleotide reproduced the biological ethylene forming reaction in plant tissues with respect to products, stereochemistry, and behavior to inhibitors.
NQR Study of the Phase Transition in 2SbCl3·o-Xylene
Authors: Ishihara Hideta , Momozaki Takanori , Yamada Koji , Okuda Tsutomu
Published: July 2006

Temperature dependence of 121Sb NQR frequencies for 2SbCl3·o-xylene showed that a phase transition takes place at about 139 K, whereas the DTA experiment showed no thermal anomaly around the transition temperature.
Synthesis, Isolation, and Characterization of New Mixed-Ligand Ruthenium(III) Complexes with Two Kinds of β-Diketones
Authors: Hoshino Yoshimasa , Yukawa Yasuhiko , Endo Akira , Shimizu Kunio , Satô Gen P
Published: July 2006

A complete series of ruthenium(III) complexes with two kinds of ligands, acetylacetone and 1,1,1-trifluoro-4-phenyl-2,4-butanedione, was synthesized and isolated chromatographically. The isomers were characterized by means of NMR spectroscopy and X-ray single-crystal analysis. An inductive effect of ligand substituents on the methyne NMR signals is briefly discussed.
Ready Thermal DDQ Dehydrogenation of Some Methylcyclopropanes Activated by a Spiro-Fused Fluorene Group
Authors: Murakami Masashi , Tsuji Takashi , Oda Masafumi , Nishida Shinya
Published: July 2006

Some methylcyclopropanes activated by a spiro-fused fluorene group were readily dehydrogenated by DDQ, but not by chloranil, to give a butadiene derivative, which reacted further with DDQ to afford 7-(o,o′-biphenylene)-3,4-dichloro-1,6-dicyano-9-alkylbicyclo[4.4.0]deca-3,8-diene-2,4-dione. In contrast, methylcyclopropanes substituted merely by two phenyl groups were reluctant to undergo the dehydrogenation.
Chemoselective Acylation of Primary Amines in the Presence of Secondary Amines with Acyl Cyanides. Highly Efficient Methods for the Synthesis of Spermidine and Spermine Alkaloid
Authors: Murahashi Shun-Ichi , Naota Takeshi , Nakajima Nobuyuki
Published: July 2006

Acyl cyanides are highly useful reagents for the chemoselective acylation of primary amines in the presence of secondary amines. The reaction provides the versatile method for the short-step synthesis of various naturally occurring polyamines.
Acid-Induced Rearrangements of 2,8-Diazabicyclo[3.2.1]octa-3,6-dienes Leading to 1,4-Dihydropyridine and Pyrrole Derivatives
Authors: Kumagai Tsutomu , Katayose Mitsuo , Mukai Toshio
Published: July 2006

2,8-Dimethoxycarbonyl, 8-methoxycarbonyl, and 2,8-dimethyl derivatives of bicyclo[3.2.1]octa-3,6-diene gave 4-imino-1,4-dihydropyridines and pyrroles under acidic conditions. In addition, the C6–C7 dihydro-analogue produced 2-vinylpyrrole by the methyl carbamate elimination.
Intramolecular Association of Viologen Dimer and Trimer Radical Cations. An Electrochemical and Spectroscopic Study
Authors: Imabayashi Shin-ichiro , Kitamura Noboru , Tokuda Koichi , Tazuke Shigeo
Published: July 2006

Viologen dimer and trimer model compounds were prepared and their reduced forms(i.e., radical cation) were investigated electrochemically as well as spectroscopically. Intramolecular association between two viologen radical cations takes place efficiently, which brings about changes in the electrode reduction processes of these compounds.
Adsorption and Decomposition of Ammonia on New Fe(1×1) Commensurate Overlayers on Ru(001) Surface with or without Co-adsorbed Oxygen
Authors: Egawa Chikashi , Iwasawa Yasuhiro
Published: July 2006

Adsorption and decomposition of ammonia on Fe(1×1) overlayers on Ru(001) surface with or without co-adsorbed oxygen were studied by means of AES, LEED and TDS. Adsorption of ammonia at 520 K on epitaxial Fe overlayers on Ru(001) surface gave a newly-ordered (√7×√7)R19° structure in the wide range of Fe coverages from 0.14 to above 1 ML. The desorption of N2 from the ordered adsorbate-layers showed a sharp peak at 850–950 K, which is consistent with the decomposition of surface nitride, Fe4N, observed for Fe single crystal planes. In contrast, c(4×2) ordered overlayer was observed upon the adsorption of oxygen on an annealed Fe/Ru(001) surface. The decomposition rate of ammonia at a steady state was enhanced by 3.5 times by co-adsorbed oxygen because nitrogen is effectively activated by surrounding oxygen atoms in c(4×2) mixed overlayers.
Pore Structure and Surface Area of CsxH3−xPM12O40 (x = 0–3, M = W, Mo)
Authors: Mizuno Noritaka , Misono Makoto
Published: July 2006

The pore-size and particle-size distributions as well as the surface areas of Cs3PW12O40 and Cs3PMo12O40 have been determined by N2 adsorption and electron micrograph. It was first demonstrated by the quantitative comparison of these data that their micro-and/ or mesopores which gave these compounds very high surface areas were due to the space between the very fine primary particles and that there were no intrinsic micropores in their crystal structure.
Heat-indueed Crystal Transformation of Synthetic Bilayer
Authors: Okuyama Kenji , Ikeda Mieko , Yokoyama Shingo , Ochiai Yanami , Hamada Yusuke , Shimomura Masatsugu
Published: July 2006

The side-by-side arrangement of azobenzene chromophores (H-aggregate) in the self-supporting cast films of C8AzoC10N+Br− changes to the head-to-tail arrangement by heating above 115 °C (J′-aggregate) and by cooling below 60 °C after annealing above 115 °C (J-aggregate). The J-aggregate changes further to the original H-aggregate by absorbing water molecules in the atmosphere.
A New Anodic C–N Bond Forming Reaction Useful to Formation of Aziridine, Azetidine, and Pyrrolidine Rings
Authors: Shono Tatsuya , Matsumura Yoshihiro , Katoh Susumu , Ohshita Jyoji
Published: July 2006

Aziridine, azetidine, and pyrrolidine rings were formed in high yields by anodic oxidation of the corresponding dimethyl α-(ω-tosylaminoalkyl)malonates in methanol containing KI as a mediator.
Amplitude in EXAFS and Ligand Exchange Reaction of Hydrated 3d Transition Metal Complexes
Authors: Miyanaga Takafumi , Watanabe Iwao , Ikeda Shigero
Published: July 2006

EXAFS (Extended X-ray Absorption Fine Structure) spectra are analyzed for a series of hydrated 3d metal complexes in crystal and in aqueous solution. It is found that the peak intensity of the metal-oxygen bond in the Fourier transform of EXAFS being considered to depend on the Debye-Waller factor correlates with the ligand exchange rate constant.
New Dinucleating Ligand, N,N′-Ethylenebis(3-carboxysalicylamine), and Its Dinuclear Copper(II) and Nickel(II) Complexes
Authors: Okawa Hisashi , Kogawa Kazuhiko , Handa Makoto , Matsumoto Naohide , Kida Sigeo
Published: July 2006

A new dinucleating ligand N,N′-ethylenebis(3-carboxysalicylamine) (H4L) has been prepared and its copper(II) and nickel(II) complexes [Cu2(L)]2H2O and [Ni2 (L) (H2O)], were obtained. A significant antiferromagnetic spin–exchange interaction operated in the copper complex through the phenolic bridge (J=−270 cm−1), whereas no spin–exchange interaction was observed for the nickel complex.
Intercalation of Co(II) meso-Tetrakis(1-methyl-4-pyridyl)porphyrin into Montmorillonite
Authors: Kameyama Hiroshi , Suzuki Hitoshi , Amano Akira
Published: July 2006

The title compound was intercalated into montmorillonite as Co–porphyrin complex by ion exchange in acid solution. Interlamellar distance of montmorillonite expanded from its regular value of 0.27 nm to 0.37 nm upon intercalation. Fluorescence emission and electron absorption revealed the retention of Co in the porphyrin intercalated.
α-Alkylation of Lithiated α,β-Unsaturated Aldehyde N,N-Dimethylhydrazones. Synthesis of α-Alkylated β,γ-Unsaturated Aldehydes
Authors: Yamashita Masakazu , Matsumiya Kaoru , Nakano Ken-ichi , Suemitsu Rikisaku
Published: July 2006

Lithiated α,β-unsaturated aldehyde N,N-dimethylhydrazones reacted with alkyl halides accompanying a double bond rearrangement to give α-alkylated β,γ-unsaturated aldehyde N,N-dimethylhydrazones in satisfactory yields. Using this reaction, the sesquiterpene, 2,5,9-trimethyl-2-vinyl-4,8-decadienal was synthesized.
Langmuir–Blodgett Films of Polyvinylamine Modified by Perfluoroacylation. Preparation of Super Thin Films
Authors: Sekiya Akira , Tamura Masanori , Ishida Hiroyasu , Watanabe Masako
Published: July 2006

Long chain perfluoroalkyl groups were introduced to polyvinylamine by perfluoroacylation. Langmuir–Blodgett films of the fluorinated polymer were successfully prepared. The thickness of monolayer of the films were super thin and it was about 8 Å. Characterization of the films were attempted.
Stabilization of a Labile cis-Azobenzene Derivative with Amphiphilic Cyclodextrins
Authors: Niino Hiroyuki , Yabe Akira , Ouchi Akihiko , Tanaka Motoo , Kawabata Yasujiro , Tamura Shoji , Miyasaka Tomohiro , Tagaki Waichiro , Nakahara Hiroo , Fukuda Kiyoshige
Published: July 2006

The cis-isomer of p-Methyl Red (cis-p-MR) was appreciably stabilized by inclusion in equimolar amphiphilic heptakis(6-alkylamino-6-deoxy)cyclodextrins (CnN-CDs) in either chloroform solution or the Langmuir–Blodgett (LB) films, as compared with that in the isolated state. Amino moieties in the cyclodextrin derivatives were found to be essential for a tight inclusion of p-MR and also for the stabilization of cis-isomer.
A Novel Glucose Sensor with a Glucose Oxidase Monolayer Immobilized by the Langmuir–Blodgett Technique
Authors: Tsuzuki Hirohiko , Watanabe Tadashi , Okawa Yusuke , Yoshida Shoichiro , Yano Shigenobu , Koumoto Kunihito , Komiyama Makoto , Nihei Yoshimasa
Published: July 2006

A monomolecular layer of glucose oxidase (GOD) was immobilized on an SnO2 electrode via glutaraldehyde-bridged covalent bonding of GOD to the amino moieties of an octadecylamine Langmuir–Blodgett film. The performance of the electrode as an amperometric glucose sensor was investigated.
The Conformation of N-Ethyl Group in Tetracyano(N-ethylethylenediamine) Complexes of Iron(II), Iron(III), and Cobalt(III)
Authors: Goto Masafumi , Kuroda Yoshitaka
Published: July 2006

The 400 MHz 1H NMR spectrum of tetracyano(N-ethylethylenediamine)cobaltate(III) has shown a pair of methylene resonaces of the ethyl group at 2.87 and 3.23 ppm, while the corresponding ferrate(II) complex has shown them at 2.65 and 3.09 ppm. The coupling constant.3JHCNH’ for the upfield and downfield resonaces of the Co(III) complex are 9.8 and ca. 2.0 Hz, respectively. The paramagnetic tetracyano(N-ethylethylenediamine)ferrate(III) showed two methylene signals of the ethyl group at −14.02 and −21.79 ppm at room temperature. Based on these results it was concluded that the methyl group of the N-ethyl group is predominantly in anti position relative to the central metal ion.
New Chiral Shift Reagents, Optically Active 2,2′-Dihydroxy-1,1′-binaphthyl and 1,6-Di(o-chlorophenyl)-1,6-diphenylhexa-2,4-diyne-1,6-diol
Authors: Toda Fumio , Mori Koji , Okada Jyoji , Node Manabu , Itoh Akichika , Oomine Kyoko , Fuji Kaoru
Published: July 2006

The title compounds were found to be useful as a chiral shift reagent in 1H NMR spectroscopy to determine enantiomeric purity of amines, alcohols, sulfoxides, selenoxides, phosphine oxides, phosphinates, and arsenoxides. It is also reported that the induced chemical shift difference increases when the title compound is used together with the typical chiral shift reagent, Eu(hfc)3.
Aldol Reaction of Aromatic Acetals with Cyclic and Acyclic Alkyl Enol Ethers by Electrogenerated Acid (EG Acid) as a Catalyst
Authors: Inokuchi Tsutomu , Takagishi Sadahito , Ogawa Keiji , Kurokawa Yuji , Torii Sigeru
Published: July 2006

Aldol reaction of aromatic acetals with alkyl enol ethers proceeds efficiently with electrogenerated acid (EG acid) independently prepared in an MeCN–NaClO4/Bu4NClO4–(Pt) system.
Transannular Photocycloaddition in 2,5-(trans-4-Octeno)hydroquinones. Striking Difference in Reactivity due to Relative Orientation of the Two Reacting Functions
Authors: Miyake Masaru , Tsuji Takashi , Nishida Shinya
Published: July 2006

2,5-(trans-4-0cteno)hydroquinones with pseudo-gauche (B) configuration undergo transannular photocycloaddition with ease ultimately to give diketones whereas those with pseudo-eclipse (A) configuration are much less reactive. The difference in the reactivity may be interpreted in terms of frontier MO control.
Palladium-Catalyzed Allylidenation of Aldehyde. A Simple and Convenient Method for the Preparation of Conjugated Diene and Polyene Compounds
Authors: Okukado Nobuhisa , Uchikawa Osamu , Nakamura Yukari
Published: July 2006

Allylic phenylcarbamates prepared from allylic alcohols and phenyl isocyanate in situ reacted with aldehydes to give conjugated dienes in good yields in the presence of tributylphosphine and a catalytic amount of Pd(PPh3)4. This method proved to be suitable for the preparation of polyene compounds such as carotenoids.
Photoarylmethylation of 1,4-Dicyanonaphthalene by Use of Group 14 Organometallic Compounds
Authors: Mizuno Kazuhiko , Terasaka Kiyotaro , Yasueda Masahiro , Otsuji Yoshio
Published: July 2006

The photoreaction of 1,4-dicyanonaphthalene (DCN) with arylmethylsilanes, germane, and stannane in polar solvents gave the arylmethylated products of DCN in high yields. The fluorescence of DCN was efficiently quenched both in polar and nonpolar solvents by these group 14 organometallic compounds. In cyclohexane, the emission from the exciplex between DCN and arylmethylsilanes was observed. The mechanistic features of the photoreaction are described.
Syntheses of [1.1]Ferrocenylruthenocenophanes and 57Fe-Moessbauer Spectroscopic Studies of Their Reaction Products with Benzoquinone and BF3–Et2O
Authors: Watanabe Masanobu , Sano Hirotoshi
Published: July 2006

[1.1]Ferrocenylruthenocenophane was prepared by the reduction of [1.1]ferrocenylruthenocenophane-1,12-dione. [1.1]Ferrocenylruthenocenophane and [1.1]ferrocenylruthenocenophane-1,12-dione react with BF3–Et2O containing benzoquinone and give black monocationic salts analyzed as [1.1]ferrocenylruthenocenophanium+BF4− and [1 .1]ferrocenylruthenocenophane-1,12-dionium+BF4−, respectively. 57Fe-Moessbauer spectroscopic studies of the salts suggest the presence of an intramolecular electron transfer between the Ru and Fe atoms.
One-Electron Reduction of Eu3+ Ions Induced by the Irradiation of γ-Ray or UV-Light. The Fluorescence Properties of Eu2+ Ions in an Ethanol Matrix
Authors: Ishida Akito , Takamuku Setsuo
Published: July 2006

Irradiation of γ-ray or UV-light induced an efficient one electron reduction of Eu3+ ions in a low temperature matrix of ethanol. Eu2+ ions produced by these processes showed a strong fluorescence which is affected by the circumstances at low temperatures.
Thermal Analysis of YBa2(Cu1−xFex)3O7−y Oxide Superconductor
Authors: Fujiwara Terufumi , Nakata Hiroyuki , Kumamaru Takahiro , Maeno Yoshiteru , Aoki Yuji , Fujita Toshizo
Published: July 2006

Thermogravimetry and powder X-ray diffraction measurements have been made for the title superconductors to show a marked discontinuity in the slope of oxygen content vs. c cell dimension plots at 810 °C (T2), other than at about 400 °C (T1). The oxygen content at T2 increases with increasing Fe doping content.
Asymmetric Intramolecular Ene Reaction Catalyzed by a Chiral Titanium Alkoxide
Authors: Narasaka Koichi , Hayashi Yujiro , Shimada Satoru
Published: July 2006

Asymmetric intramolecular ene reaction proceeds by employing a chiral titanium alkoxide as a Lewis acid, and cyclohexane derivatives are prepared in high enantioselectivity from 1,3-oxazolidin-2-one derivatives of 2,8-dienoic acids.
Synthesis of (R)-(−)-O-Methyljoubertiamine
Authors: Asaoka Morio , Fujii Naoaki , Takei Hisashi
Published: July 2006

The title compound was synthesized by utilizing [3,3]sigmatropic rearrangement of 3-substituted 2-cyclohexenol derivative for the construction of optically active quaternary carbon center.
A Stereoselective Synthesis of N-[(S)-1-Ethoxycarbonyl-3-phenylpropyl]-l-alanine Derivatives by Means of Reductive Amination
Authors: Iwasaki Genji , Kimura Rieko , Numao Naganori , Kondo Kiyosi
Published: July 2006

A stereoselective synthesis of N-[(S)-1-ethoxycarbonyl-3-phenylpropyl]-l-alanine, a portion of the molecule of angiotensin converting-enzyme(ACE) inhibitors, by reductive amination utilizing catecholborane and further applications of the reaction to the synthesis of ACE inhibitors are described.
Formation of Uronic Acid by Galactose Oxidase
Authors: Matsumura Shuichi , Kuroda Akihiro , Higaki Norihiko , Hiruta Yukari , Yoshikawa Sadao
Published: July 2006

The C-6 hydroxymethyl group of methyl d-galactopyranoside and oligosaccharides containing d-galactopyranosyl residues were found to be oxidized with oxygen by galactose oxidase to the corresponding carboxyl group via an aldehyde intermediate.
Activation of Molecular Oxygen into Hydrogen Peroxide via α-Azobenzyl Hydroperoxide. A Generation of Hydrogen Peroxide from Organic Hydroperoxide by the Amine-base Catalyzed Reaction
Authors: Tezuka Takahiro , Otsuka Takashi
Published: July 2006

Hydrogen peroxide is generated together with nitrile imine from α-azobenzyl hydroperoxide, which is formed readily by autooxidation of arylaldehyde hydrazone, via peroxycarboximidic acid by the amine-base catalyzed reaction in benzene. This provides a new type of activation reaction of molecular oxygen into hydrogen peroxide by aldehyde hydrazone.
Stereospecific Total Synthesis of Dimorphecolic Acid, 5(S)-HETE, and 12(S)-HETE
Authors: Shimazaki Toshiyuki , Kobayashi Yuichi , Sato Fumie
Published: July 2006

First enantiospecific synthesis of dimorphecolic acid is accomplished via an efficient and stereocontrolled route. The convenient synthesis of 5(S)-HETE and 12(S)-HETE is also described.
A New Ultra-thin Film of Solid Polymer Electrolyte Prepared by Plasma Polymerization
Authors: Ogumi Zempachi , Uchimoto Yoshiharu , Takehara Zen-ichiro
Published: July 2006

An ultra-thin polymer film containing sulfonic ester group is prepared by polymerization of methyl benzenesulfonate and octamethylcyclotetrasiloxane in glow discharge. The sulfonic ester group is transformed to lithium sulfonate group by the treatment with LiI. Hybridization of plasma polymer containing lithium sulfonate group with poly(ethylene oxide) forms only lithium ion conductive films.
Configurational Correlations of Some Secondary Alcohols by 1H NMR Spectroscopy
Authors: Takano Seiichi , Takahashi Michiyasu , Yanase Masashi , Sekiguchi Yoshinori , Iwabuchi Yoshiharu , Ogasawara Kunio
Published: July 2006

Examination of 1H NMR of the MTPA esters of 21 examples of secondary alcohols allows facile correlations of the absolute configuration of the substrates without exception.
X-Ray Structural Study of a 1:2:1 Inclusion Complex of Non-centrosymmetric 1,6,9,14-Tetrahydroxy-1,6,9,14-tetra-t-butylcyclohexadeca-2,4,7,10,12,15-hexayne, Ethanol, and Water
Authors: Toda Fumio , Okada Koji , Mak Thomas C W
Published: July 2006

The structure of the title cyclic hexayne has been elucidated by X-ray analysis of its 1:2:1 inclusion complex with EtOH and H2O. The important role of H2O in consolidating the disordered, hydrogen-bonded host lattice is also clarified.
Synthesis and Characterization of a New Class of Organo-polynuclear Complexes Containing Cationic Palladium Atoms
Authors: Onitsuka Kiyotaka , Ogawa Hiroo , Joh Takashi , Takahashi Shigetoshi
Published: July 2006

Cationic organopalladium complexes having an extended structure are described as a new class of organo-polynuclear complexes containing ionic transition metals with regular arrangement in the main chain.
Crystal Structures of Compounds Obtained from Lead(II) Iodide-Hexamethylenetetramine System, [C6H13N4]2[Pb3I8(C6H12N4)2] and [C6H13N4][PbI3M3]
Authors: Miyamae Hiroshi , Nishikawa Hidetsugu , Hagimoto Koichi , Hihara Goro , Nagata Miharu
Published: July 2006

Formamide solution of lead(II) iodide (Pbl2) with hexamethylenetetramine (hmta) gave [C6H13N4]2[Pb3I8(C6H12N4)2], while reaction of PbI2 with hmta through intervention of water produced [C6H13N4][PbI3]. From characterization of the crystals by X-ray diffraction, hmta appears to tend to be protonated cations, but one of hmta is coordinated to Pb atom in the former compound.
Structural Control of the Prussian Blue–Nafion Composite Membrane
Authors: Honda Kenji , Hayashi Hideko , Chiba Kazuyuki
Published: July 2006

On the complex formation of Prussian Blue (PB) in a solid matrix of Nafion membrane (Nf), it was possible to control a structure of the PB–Nf composite membrane by regulating the rate and direction of diffusion in the solid phase of two component ions, Fe2+ and Fe(CN)63−.
Mode of Degradation of Homopolyribonucleotides by PDM Phosphatase of Fusarium moniliforme
Authors: Yoshida Hiroshi , Konno Osamu
Published: July 2006

PDM phosphatase degrades homopolyribonucleotides, poly(A), poly(I), poly(C), and poly(U). The former three are degraded exonucleolytically into nucleoside and inorganic phosphate through 5′-nucleotide. In the case of poly(U), the enzyme acts endonucleolytically and exonucleolytically at the same time.
Heterogeneous Catalysts for the Continuous Oxidation of Benzene to Phenols
Authors: Kunai Atsutaka , Ishihata Koji , Ito Sotaro , Sasaki Kazuo
Published: July 2006

The catalytic oxidation of benzene in the presence of air and reducing gases has been examined. All the catalysts studied, active carbon, several forms of platinum, zeolite of Cu form, and Pd/silica, were found to be effective for reducing Cu(II) to Cu(I) and thereby producing phenols. Among these, Pd/silica showed the best performance and is capable for practical use.
Studies on the Molecular Overturn during Compulsory Z-Type Deposition of LB Films Using Double Gates
Authors: Kato Teiji
Published: July 2006

Overturn of molecules during the compulsory Z-type deposition using double gates was investigated by in-situ photopolymerization of a film material and by contact angle measurements of resultant LB films with water. The experimental results made inferable that molecules should overturn three times in total for every two cycles of the compulsory Z-type deposition.
Preparation of High-Tc Bi–Sr–Ca–Cu–O Films on Metal Substrates by Pyrolysis of 2-Ethylhexanoates
Authors: Makida Seigo , Nasu Hiroyuki , Miyamoto Aiko , Imura Takeshi , Osaka Yukio , Shiono Takeo , Nakamoto Takao
Published: July 2006

High-Tc superconducting Bi–Sr–Ca–Cu–O films were prepared on some metal substrates by pyrolysis of 2-ethylhexanoates. Although a high-Tc superconducting phase could seen for the films on stainless steel or silver substrates, only the films on silver substrates showed diamagnetism below 73 K and Tc(end)=68 K.
Regioselective Methylation of Epoxides Using Transition Metal Complexes
Authors: Hase Toshiya , Miyashita Akira , Nohira Hiroyuki
Published: July 2006

M(PPh3)4 (M= Ni, Pd, Pt) promoted regioselective methylation of 1,2-epoxy-2-methylpropane with methyl iodide affording 2,2-dimethylpropanol. In the course of the reaction, \ ranstrans-CH3MI(PPh3)2, initially formed from the reaction of M(PPh3)4 with CH3I, attacked the epoxide electrophilicly resulting regioselective cleavage of the C–O bond of the epoxide, followed by the formation of the isolable 2,2-dimethylpropoxymetal complexes.
Methane Oxidation over Perovskite-type Oxide Containing Alkaline-earth Metal
Authors: Nagamoto Hidetoshi , Amanuma Kazushi , Nobutomo Hiroyuki , Inoue Hakuai
Published: July 2006

Perovskite-type oxides(ABO3) containing alkaline-earth metal Ba or Sr exhibited fairly good catalytic activity for oxidative coupling of methane to ethane and ethylene. These oxides were stable against produced carbon dioxide at 1023 K. The catalytic activity was well correlated with the A ion and the difference of the interatomic distance from the equilibrium distance.
Selective Hydrogenation of Internal and Terminal C≡C Bonds on Rare Earth Catalysts Formed by Metal Vapor Deposition
Authors: Imamura Hayao , Kitajima Keiji , Tsuchiya Susumu
Published: July 2006

The rare earth catalysts obtained when Sm and Yb were vaporized into a frozen organic matrix exhibited selective hydrogenation of various acetylenic derivatives. Sm/THF and Yb/THF discriminated between internal and terminal triple bonds.
Photopreparation of Heterogeneous Metathesis Catalysts from Metal Carbonyls Adsorbed on Solids
Authors: Wada Yuji , Nakaoka Chikanori , Morikawa Akira
Published: July 2006

It was demonstrated that Mo(CO)6 and W(CO)6 adsorbed on solid supports, such as porous Vycor glass and NaY zeolite, were photoactivated to be catalytically active for propene metathesis.
Synthesis of Sodium Tetramethylammonium Pentamolybdodisulfate(VI)(4-) Trihydrate, Na[(CH3)4N]3S2Mo5O23·3H2O
Authors: Himeno Sadayuki , Hori Toshitaka , Tanaka Hiroshi , Saito Atsuyoshi
Published: July 2006

Colorless heteropoly molybdosulfate was isolated as sodium tetramethylammonium (Me4N+) salt Na[(CH3)4N]3S2Mo5O23·3H2O from the Mo(VI)/H2SO4/C2H5OH system. The presence of C2H5OH in the system favored the formation of the colorless complex rather than the previously reported yellow complex. The colorless complex was characterized by chemical analysis and IR spectroscopic measurements.