bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Grafting Method by Use of Polymeric Sulfonium Salt. Grafting of Bicyclo Ortho Ester onto Polystyrene
Authors: Uno Hitomi , Endo Takeshi
Published: July 2006

Polymer containing sulfonium salt structure, which was obtained by the polymerization of p-vinylbenzyl tetramethylenesulfonium hexafluoroantimonate, was found to behave as a polymeric thermal latent catalyst for the polymerization of bicyclo ortho ester and lead to the grafted polymer.
Triplet States of Cyclic Olefins and Dienes. On the Lifetimes and Chemical Reactivities Studied by Pulse Radiolysis
Authors: Nakabayashi Kenichi , Toki Susumu , Takamuku Setsuo
Published: July 2006

Triplet lifetimes of cyclic olefins and dienes measured by pulse radiolysis are dependent on the ring size which affects the most stable conformation of the triplet. In the case of cyclic nonconjugated dienes, an intramolecular biradical formation is an important decay process when the reaction is sterically allowed.
Palladium(0) Catalysed Conversion of α-Nitroepoxides into 1,2-Diketones
Authors: Vankar Yashwànt D , Singh Surendra P
Published: July 2006

A variety of α-nitroepoxides have been found to undergo conversion to the corresponding 1,2-diketones with Pd(PPh3)4. Two examples form α-nitroketones instead of 1,2-diketones.
Highly Stereoselective Photoisomerization of all-trans Naphthyl Retinal Analog to the 11-cis Isomer by Protein Mediation
Authors: Tsujimoto Kazuo , Ohmura Ken , Ohashi Mamoru , Hara Reiko , Hara Tomiyuki , Ozaki Koichi , Watanabe Masakatsu
Published: July 2006

Protein-mediated photoisomerization of all-trans Np-retinal stereospecifically gave the 11-cis isomer whose structure was determined, whereas irradiation of all-trans Np-retinal in acetonitrile furnished the four isomers, none of which was the 11-cis isomer.
Single Crystal Growth of Sparingly Soluble Adducts of Lewis Acids with Bases
Authors: Hihara Goro , Miyamae Hiroshi , Nagata Miharu
Published: July 2006

A method is described for growing single crystals from a solution where a base’s concentration is controlled so that an adduct to be grown is equilibrated with the solution. A slight difference in its solubilities at two different temperatures is responsible for their growth process. The technique is valuable for adducts which cannot readily be grown in other ways owing to their low solubilities.
Synthesis of New Trioctahedral Mg-Smectite
Authors: Torii Kazuo , Iwasaki Takashi
Published: July 2006

New trioctahedral Mg-smectites were synthesized hydrothermally from homogeneous Mg–Si precipitates having a wide range of compositions, i.e., from Mg=3.2 to 6, vs. Si=8 in the atomic ratios. Dispersed solutions of the synthetic smectites formed transparent gels possessing good rheological properties.
Oxidoreduction between Cycloalkanols and Cycloalkanones in the Cultured Cells of Nicotiana tabacum. Correlation of the Reaction Rate with the 13C NMR Chemical Shift of the Carbonyl Carbon
Authors: Suga Takayuki , Izumi Shunsuke , Hirata Toshifumi
Published: July 2006

The enzyme system responsible for the oxidoreduction between cycloalkanols and their corresponding cycloalkanones in the cultured cells of Nicotiana tabacum was found to be alcohol dehydrogenase which is similar to the dehydrogenase from tea seeds and horse liver. The rate constants and the equilibrium constants of the oxidoreduction between the cycloalkanols and their corresponding cycloalkanones with this enzyme system were well correlated with the 13C NMR chemical shift of the carbonyl carbon of the oxidation products, i.e., the cycloalkanones.
Synthesis of Cyclopentane Derivatives by Electrochemical Reduction of 1,5-Dibromopentane Derivatives
Authors: Mitani Michiharu , Takeuchi Hiroshi , Koyama Kikuhiko
Published: July 2006

When 1,5-dibromopentane derivatives, which were prepared by CuBr-catalyzed photochemical reaction of 1,3-dibromopropane or its derivatives with electron-deficient olefins, were subjected to electrochemical reduction in THF or DMSO solution, cyclopentane derivatives were obtained.
Photochemical Generation of 1,1′-Ethylenebis(pyridinyl) Diradical from Its Cyclomers
Authors: Muramatsu Takashi , Hanaya Kaoru , Ikegami Yusaku
Published: July 2006

Reduction of 1,1′-ethylenebis(pyridinium) dibromide with sodium amalgam afforded the cyclomers of 1,1′-ethylenebis(pyridinyl) diradical. Meso and dl forms of the cyclomers are convertible to each other. Photolysis of the cyclomers showed a triplet ESR spectrum characteristic of the diradical.
STEREOSELECTIVE PREFERENCE OF BOVINE SERUM ALBUMIN IN THE BURST PHASE OF REACTION WITH AMINO ACID p-NITROPHENYL ESTERS
Authors: Nango Mamoru , Kimura Yoshiharu , Kanda Shinichi , Ihara Yasuji , Koga Joichi , Kuroki Nobuhiko
Published: July 2006

Bovine serum albumin exhibits remarkable acylation efficiency and stereoselectivity in the hydrolysis of optically active amino acid p-nitrophenyl esters. A stereoselective ratio, kD/kL = 66 has been observed with added Triton-x. The hydrolysis rate and stereoselectivity depend on the structure of the substrate and of added surfactants.
INTERACTION OF DNA WITH ANTITUMOR ACTIVE PLATINUM COMPLEXES. PLATINUM COMPLEXES INVOLVING MESO DIAMINE LIGAND GAVE TWO Pt-d(GpG) ADDUCTS
Authors: Inagaki Kenji , Ninomiya Chikako , Kidani Yoshinori
Published: July 2006

Reaction products of Pt(meso-diamine)2+ involving bulky substituted group with DNA were investigated by using enzymatic digestion technique. Main Pt-adducts were complexes with an intrastrand crosslink between two adjacent guanine bases through N7, N7. Stereoselectivity arised from steric hindrance was observed.
PHOTOSENSITIZED DIMERIZATION OF PHENOL IN PORPHYRIN–QUINONE–PHENOL SYSTEM
Authors: Maruyama Kazuhiro , Furuta Hiroyuki
Published: July 2006

Photosensitized dimerization of 4-methoxyphenol was observed upon irradiation of porphyrin in the presence of quinone. Quantum yield for dimer was depended upon the concentration and reduction potential of quinones used. Free radical coupling mechanism was confirmed by means of ESR and CIDNP techniques.
KINETIC AND THERMODYNAMIC PARAMETERS FOR THE PHEOPHYTIN a/a′ EPIMERIZATION IN ORGANIC SOLVENTS
Authors: Watanabe Tadashi , Nakazato Masataka , Honda Kenichi
Published: July 2006

The epimerization rate constants and equilibrium compositions for the pheophytin a/a′ pair have been determined for the first time in ten organic solvents. The rate constant varies by five orders-of-magnitude with the nature of solvent. A free energy diagram for the epimer pair is constructed from temperature dependencies of the two parameters in N,N-dimethylformamide.
CERIUM(IV)-SULFITE CHEMILUMINESCENT SYSTEM. ADDITION OF SODIUM DODECYLSULFATE FOR LINEARITY IMPROVEMENT AND INTERFERENCE REDUCTION
Authors: Takeuchi Koji , Ibusuki Takashi
Published: July 2006

The range in which chemiluminescence intensity of the cerium(IV) sulfate-sulfite system changes linearly with sulfite concentration has been expanded more than one order of magnitude (0.2–600 ng SO2 ml−1) by addition of sodium dodecylsulfate (SDS) to sample solutions. In addition, interferences from nitrite and halide ions were greatly reduced. The optimum concentration of SDS was found to be 1 g l−1 which was lower than the critical micelle concentration. The role of SDS was briefly discussed in terms of the interaction between water and the excited molecules.
IMMOBILIZATION OF COLLOIDAL PLATINUM PARTICLES ONTO POLYACRYLAMIDE GEL HAVING AMINO GROUPS AND THEIR CATALYSES IN HYDROGENATIONS OF OLEFINS
Authors: Hirai Hidefumi , Ohtaki Michitaka , Komiyama Makoto
Published: July 2006

Colloidal platinum dispersions, prepared by photo-reduction of tetrachloroplatinate(II) ion in the presence of a copolymer of N-vinyl-2-pyrrolidone and acrylamide, are treated with polyacrylamide gel having amino groups, resulting in stable immobilization of colloidal particles onto the gel. The immobilized catalysts exhibit high activities in hydrogenations of olefins at 30 °C under 1 atm.
PLATINUM COMPLEX CATALYZED TRANSFORMATION OF AMINE. N-ALKYLATION AND N-ALLYLATION USING PRIMARY ALCOHOLS
Authors: Tsuji Yasushi , Takeuchi Ryo , Ogawa Hiroshi , Watanabe Yoshihisa
Published: July 2006

Amines reacted with primary alcohols in the presence of a platinum complex catalyst at 120–180 °C to give N-alkylated or N-allylated compounds.
CATALYTIC REARRANGEMENT OF TETRAHYDRODICYCLOPENTADIENE TO ADAMANTANE OVER Y-ZEOLITE
Authors: Honna Kosaku , Sugimoto Michio , Shimizu Nobuaki , Kurisaki Konomu
Published: July 2006

Bifunctional rare-earth exchanged Y zeolite, has the high catalytic activity for the synthesis of adamantane from tetrahydrodicyclopentadiene in the presence of hydrogen and hydrogen chloride, in a fixed bed flow system. The catalyst deactivated by pore plugging with deposited hydrocarbons can be almost completely regenerated by hydrocracking.
THE BAEYER-VILLIGER OXIDATION OF 7-ALKYLIDENEBICYCLO[2.2.1]HEPTENONE
Authors: Sakai Kunikazu , Yamashita Mitsuo , Shibata Yoshiko
Published: July 2006

The first example of the Baeyer-Villiger oxidation of 7-alkylidene-2-oxo-5-bicyclo[ 2.2.1]heptene is described to give 6-alkylidene-2-oxa-3-oxo-7-bicyclo[3.3.0]octene exclusively, which is the versatile precursor for the short-cut synthesis of Δ12-prostaglandin A2 analogs.
IN SITU GENERATION AND CHEMICAL REACTIVITIES OF HRu(CO)4− RELEVANT TO THE REDUCTION OF CARBON MONOXIDE
Authors: Tanaka Masato , Sakakura Toshiyasu , Hayashi Teruyuki , Kobayashi Toshi-aki
Published: July 2006

HRu(CO)4− could be in situ generated from Ru3(CO)12 in the presence of basic salts in amide solvents when exposed to syn gas. In the reduction of carbon monoxide, HRu(CO)4− generating catalyst systems selectively gave methanol. HRu(CO)4− exerted higher reactivities in the reduction of acetaldehyde and in the bimolecular reductive elimination with CH3COCo(CO)3PPh3, as compared to HRu3(CO)11−.
PREPARATION OF MONOLAYER FILMS OF AROMATIC POLYAMIC ACID ALKYLAMINE SALTS AT AIR–WATER INTERFACE
Authors: Suzuki Masa-aki , Kakimoto Masa-aki , Konishi Toru , Imai Yoshio , Iwamoto Mitsumasa , Hino Taro
Published: July 2006

Thin films of polyamic acid alkylamine salts which possess long alkyl side chain were successfully prepared at air–water interface. It was concluded that the polymer salts had a monolayer structure in which aromatic rings of the polyamic acids lied flat on the water surface.
A NOVEL ROUTE TO α,β-UNSATURATED ESTERS VIA A REFORMATSKY-TYPE REACTION USING SODIUM TELLURIDE
Authors: Suzuki Hitomi , Inouye Masahiko
Published: July 2006

Sodium telluride, prepared by heating tellurium and sodium hydride in a 1:2 molar ratio in dry N,N-dimethylformamide, readily debrominates a bromoacetic ester at low temperatures to generate an enolate anion, which undergoes a Reformatsky-type reaction with various non-enolizable aldehydes to give the corresponding α,β-unsaturated esters in good to moderate yields. Ketones remain almost unaffected under the same conditions.
ULLMANN-TYPE COUPLING REACTION OF ARYL TRIFLUOROMETHANESULFONATES CATALYZED BY IN SITU-GENERATED LOW VALENT NICKEL COMPLEXES
Authors: Yamashita Junzo , Inoue Yoshio , Kondo Takashi , Hashimoto Harukichi
Published: July 2006

The low valent nickel complexes generated in situ from nickel(II) chloride, triphenylphosphine, sodium iodide, and zinc powder in dimethylformamide catalyze the Ullmann-type homo-coupling of aryl trifluoromethanesulfonates to biaryls under ultrasounds irradiation.
VISIBLE LIGHT- AND GAMMA RAY-INDUCED ALKYLATION IN PYRIDINE RING. EFFECTIVE ALKYLATION WITH VISIBLE LIGHT IN THE PRESENCE OF IRON(III) SULFATE
Authors: Sugimori Akira , Yamada Tetsuo
Published: July 2006

Quinoline and 4-methylquinoline are alkylated with alkanecarboxylic acid upon visible light- or gamma-irradiation. In the photo-alkylation, iron(III) sulfate not only accelerates the reaction, but also improves the selectivity for alkylation. Titanium oxide shows smaller effects than iron(III) sulfate.
GAS SENSITIVITY OF CuO/ZnO HETERO-CONTACT
Authors: Nakamura Yoshinobu , Ando Akiro , Tsurutani Tsuyoshi , Okada Osamu , Miyayama Masaru , Koumoto Kunihito , Yanagida Hiroaki
Published: July 2006

Gas sensitivity of CuO/ZnO hetero-contact was investigated at 160–340 °C. The gas sensitivity changed not only with the kind of gases and measuring temperature but with the voltage applied to the hetero-contact. Very high sensitivity and selectivity for CO gas was observed at 260 °C under the applied voltage of 0.1–0.9 V.
SYNTHESIS OF (GLYCOLATO-O,O′)DIAMMINEPLATINUM(II) AND ITS RELATED COMPLEXES
Authors: Totani Tetsushi , Aono Katsutoshi , Komura Michihiro , Adachi Yasuko
Published: July 2006

Glycolatoplatinum(II) complexes, [Pt(OCOCH2O)L2], having a novel five-membered ring structure were obtained by adding an equimolar quantity of glycolic acid to cis-[Pt(OH)2L2] (L: NH3, amines) in water followed by heating. These complexes have also been obtained by reaction of cis-[Pt(NO3)2L2] with sodium glycolate in neutral aqueous solution. These complexes have been characterized by SIMS, IR, and NMR spectroscopy.
INFLUENCE OF ALLOYING ON THE HYDRATION OF ACRYLONITRILE TO ACRYLAMIDE BY COPPER–NICKEL ALLOY CATALYSTS
Authors: Sugiyama Kazuo , Miura Hiroshi , Watanabe Yoshichika , Ukai Yasunori , Matsuda Tsuneo
Published: July 2006

The liquid phase hydration of acrylonitrile to acrylamide was studied over the Cu–Ni alloy catalysts with various compositions. The maximum synergestic effect was observed over the alloy with the surface component ratio of Cu to Ni of 4.
PHOTORESPONSIVE POLYMERS CONTAINING ZIRCONIUM WHICH RESPONDS TO VISIBLE LIGHT
Authors: Yonemura Michiko , Sekine Tadao , Ueda Hisashi
Published: July 2006

Photoresponsive polymers which change their magnetic properties when illuminated by visible light was found. n-Butyl zirconate was polymerized in tetrahydrofuran and other solvents. The polymer, when illuminated, changes its conformation and a new spin-nuclear interaction in ESR spectrum is observed.
ESR STUDY OF CATION RADICALS OF SILYL-SUBSTITUTED ETHERS AND SULFIDES
Authors: Kira Mitsuo , Nakazawa Hiroko , Sakurai Hideki
Published: July 2006

ESR spectra of cation radicals of trialkylsilyl-substituted ethers and sulfides have provided an experimental measure of the mixing between a silicon–carbon σ bonding orbital and a nonbonding orbitals on oxygen and sulfur atoms in the singly occupied molecular orbital.
ENHANCED QUENCHING OF PYRENE FLUORESCENCE IN METHYLVIOLOGEN-INDUCED PREMICELLAR AGGREGATES AND INCLUSION EFFECT OF β-CYCLODEXTRIN ON THE QUENCHING
Authors: Kusumoto Yoshihumi , Shizuka Michiko , Satake Iwao
Published: July 2006

The formation of methylviologen-induced premicelles was evidenced by an enhanced fluorescence quenching and the appearance of a new absorption band of pyrene in the premicellar region of sodium dodecyl sulfate. Addition of β-cyclodextrin to the above system led to less pronounced quenching.
HIGH-PRESSURE CATALYTIC HYDRATION OF OLEFINS OVER VARIOUS PROTON-EXCHANGED ZEOLITES
Authors: Eguchi Koichi , Tokiai Takeo , Kimura Yoshio , Arai Hiromichi
Published: July 2006

Catalytic hydration of ethylene, propylene, and 1-butene to alcohol was investigated at high pressures using proton-exchanged zeolites. All the zeolites more or less exhibited the hydration activities. Pentasil- and ferrierite-type zeolites were the most active among the zeolite catalysts. The activities of zeolite catalysts are correlated with the amount of adsorbed water, indicating that hydrophobic acid sites are effective for olefin hydration.
ELECTROCHEMICAL GROWTH OF Pt ULTRAMICROPARTICLES IN NAFION FILMS ON GLASSY CARBON ELECTRODES
Authors: Itaya Kingo , Matsushima Yoshiyuki , Uchida Isamu
Published: July 2006

The electrodeposition of platinum (Pt) into Nafion films on glassy carbon electrode is described. The Pt particles are dispersed three-dimensionally throughout the Nafion layer. The specific surface area of the particles is surprisingly large, suggesting that the Pt particles are highly dispersed into the Nafion film. The average crystal size of the platinum clusters is on a range of 100 to 200 Å.
pH DEPENDENT OXIDATION-REDUCTION OF 1-BENZENESULFENYL-2-PROPANONE AND ITS OXIDES BY A MICROORGANISM
Authors: Ohta Hiromichi , Kato Yasuo , Tsuchihashi Gen-ichi
Published: July 2006

Incubation of 1-benzenesulfenyl-2-propanone with Corynebacterium equi IFO 3730 in a weakly acidic medium afforded (S)-1-benzenesulfenyl-2-propanol. On the contrary, when the cultivation was carried out at pH 8 with the same bacterium, only the (S)-alcohol was transformed into the starting ketone, the (R)-alcohol being recovered intact. The similar enantioselectivities were also observed in the reaction of 1-benzenesulfinyl-2-propanone.
SPIN-POLARIZED TRANSIENT RADICALS FROM p-BENZOQUINONE AND DI-t-BUTYL-p-QUINONES BY PHOTO-EXCITATION OF BENZOPHENONE IN A MAGNETIC FIELD
Authors: Kaise Masahiro , Nishihara Chizuko , Nozoye Hisakazu , Someno Kazuo
Published: July 2006

In the photochemical electron transfer reactions of t-alkylamine and p-benzoquinone in liquid, emissively spin-polarized transient anion radicals from p-benzoquinone(PBQ) and 2,5- or 2,6-di-t-butyl-p-quinone(25Q or 26Q) are exclusively produced by photo-excitation of benzophenone(BP) in a magnetic field. Transient radicals of quinones with different unpaired spin distribution are obtained at the onset of photolysis.
PREPARATION AND PROPERTIES OF NEW THIOLATO- AND MERCAPTO-TRANSITION METAL COMPLEXES, MR(SR′)(PR″3)2 (M = Ni, Pd; R = H, Ar; R′ = H, Ar). EVOLUTION OF R–R′ FROM THE COMPLEXES THROUGH CLEAVAGE OF THE S–R′ BOND
Authors: Osakada Kohtaro , Hayashi Hiroki , Maeda Meguru , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

New nickel(II) and palladium(II) complexes having both hydrido and arylthiolato ligands, MH(SAr)(PCy3)2, and complexes with aryl and mercapto ligands, Ni(Ar)(SH)(PEt3)2 (M = Ni, Pd; Ar = C6H5-,p-CH3-C6H4-, p-CH3OC6H4-), were prepared. Thermolysis of these complexes caused cleavage of the S–C or S–H bond to evolve Ar–H.
SYNTHESIS AND RESOLUTION OF A NEW TYPE OF CHIRAL BISPHOSPHINE LIGAND, trans-BIS-1,2-(DIPHENYLPHOSPHINO)CYCLOBUTANE, AND ASYMMETRIC HYDROGENATION USING ITS RHODIUM COMPLEX
Authors: Minami Toru , Okada Yoshiharu , Nomura Ryoichi , Hirota Shuji , Nagahara Yoshitomo , Fukuyama Keiichi
Published: July 2006

Oxidative coupling of the 1,4-dicarbanions derived from bis-1,4-(diphenylphosphinyl)butane gave (±)-trans-bis-1,2-(diphenylphosphinyl)cyclobutane. Asymmetric hydrogenation of dehydroamino acids using rhodium complex of the optically active bisphosphine obtained by reduction of the resolved bisphosphine oxide afforded hydrogenated products in high optical yields.
LEWIS ACID CATALYZED REARRANGEMENT OF VINYLCYCLOPROPANECARBONYL CHLORIDE TO CYCLOPENTENECARBONYL CHLORIDE
Authors: Sakito Yoji , Suzukamo Gohfu
Published: July 2006

Vinylcyclopropane-cyclopentene rearrangement of 2-(2-arylvinyl)cyclopropanecarbonyl chlorides was observed upon treatment with a Lewis acid under mild reaction conditions to afford 2-arylcyclopent-3-enecarboxylates after esterification.
AQUEOUS CHEMISTRY OF TIN(III). A FLASH PHOTOLYSIS STUDY
Authors: Shinohara Nobuyoshi , Mori Katsuhiko , Inoue Makoto
Published: July 2006

Unstable Sn(III) was produced by ultraviolet irradiation of Sn(II) or Sn(IV) chloride complex in deaerated aqueous hydrochloric acid solution. The optical spectrum of the transient species, Sn(III), observed by using the technique of flash photolysis, has a absorption maximum at 280 nm in 1 mol dm−3 HCl and the lifetime is very short. The rate constant of Sn(III) oxidation with oxygen is 1.7×108 mol−1 dm3 s−1.
THE STRUCTURE OF A NEW NATURAL APOTIRUCALLANE-TYPE TRITERPENE AND THE STEREOCHEMISTRY OF THE RELATED TERPENES. X-RAY AND 13C NMR SPECTRAL ANALYSES
Authors: Nakanishi Tsutomu , Inada Akira , Nishi Masatoshi , Miki Takuichi , Hino Ryozi , Fujiwara Takaji
Published: July 2006

The structure of a new apotirucallane-type triterpene, 21-O-acetyl toosendantriol, isolated from the fruit of Melia toosendan was determined by X-ray analysis. Based on comparison of the 13C chemical shifts, the steric structures of the side chains of two epimeric 21-acetates derived from a tirucallane-type terpene, melianone were also clarified.
RADICAL REARRANGEMENT OF A THIOESTER MEDIATED BY COBALAMIN
Authors: Tada Masaru , Inoue Kunimi , Okabe Masami
Published: July 2006

Zinc-reduction of 2-(ethylthio)carbonyl-2-phenylpropyl bromide in the presence of cobalamin gave the products formed by the migration of the thioester group. The formation of olefinic products excludes an anion mechanism and the rearrangement is concluded to be a radical rearrangement under the assistance of cobalamin.
ION-EXCHANGE PROPERTIES OF SILICA-TITANIA MIXED-OXIDE GEL FOR AMMONIA IN AQUEOUS SOLUTIONS
Authors: Kaneko Shoji , Ohtaki Hiromichi , Tsukamoto Kazuyoshi
Published: July 2006

Proton-form silica-titania gel of mole ratio 1:1 exhibited high ion-exchange abilities for ammonia in aqueous solutions. Its apparent capacity increased with increasing pH of solution tested, which attained above 4 mmol g−1 at pH 9. Separation of ammonia and sodium in aqueous solution loaded in advance on the silica-titania gel was complete when used hydrochloric acid as an eluent.
α-ACYLAMINORADICAL ANNELATION IN THE DIASTEREOSELECTIVE SYNTHESIS OF 1- AND 5-SUBSTITUTED TETRAHYDROPYRROLO[1,2-c]OXAZOLE AND 1-SUBSTITUTED PYRROLIZIDINE DERIVATIVES
Authors: Kano Shinzo , Yuasa Yoko , Asami Kenji , Shibuya Shiroshi
Published: July 2006

Diastereoselective synthesis of 1,8-trans-1-substituted and 5,8-trans-5-substituted tetrahydropyrrolo[1,2-c]oxazoles was achieved by an application of α-acylaminoradical cyclization at a silylated triple bond. The method was applied to an enantioselective synthesis of the 1,8-trans-oriented 1-oxygenated pyrrolizidine.
THE MESOMORPHIC PROPERTIES OF 1,2,4-TRISUBSTITUTED BENZENES
Authors: Takenaka Shunsuke , Masuda Yoshihide , Kusabayashi Shigekazu
Published: July 2006

The mesomorphic properties for two series, 1,2,4-tri(4-alkoxyphenoxycarbonyl)benzenes and 1,2,4-tri(4-alkoxybenzoyloxy)benzenes have been examined. For the former series, the nematic and smectic A phases commence from the heptyloxy and nonyloxy homologs, respectively, and the latter series is non-mesogenic.
SYNTHESIS OF (±)-COSTUNOLIDE, AN ANTITUMOR GERMACRANOLIDE, FROM E,E-FARNESOL BY USE OF A LOW-VALENT CHROMIUM REAGENT
Authors: Shibuya Hirotaka , Ohashi Kazuyoshi , Kawashima Keiko , Hori Kazuyuki , Murakami Nobutoshi , Kitagawa Isao
Published: July 2006

E,E-Farnesol was transformed into ω-bromo-farnesal, which cyclized to afford a racemic germacrane-type compound (5) with a low-valent chromium reagent 5 was then converted to (±)-dihydrocostunolide and (±)-costunolide.
PREPARATION OF CARBON ELECTRODES MODIFIED WITH POLY(MERCAPTOHYDROQUINONE)S AND THEIR FUNCTIONS AS pH SENSOR
Authors: Arai Gorou , Koike Takashi , Yasumori Iwao
Published: July 2006

Carbon fiber electrodes (CFE) were modified with either a poly(mercaptohydroquinone) film or a poly(methylmercaptohydroquinone) film by means of electrochemical oxidation. The modified CFE thus prepared showed an excellent Nernstian response to H+ ion over the pH range from 2 to 9.
A NOVEL DECARBOXYLATION OF α-AMINO ACIDS. A FACILE METHOD OF DECARBOXYLATION BY THE USE OF 2-CYCLOHEXEN-1-ONE AS A CATALYST
Authors: Hashimoto Mitsunori , Eda Yutaka , Osanai Yasutomo , Iwai Toshiaki , Aoki Seiichi
Published: July 2006

In the presence of a catalytic amount of 2-cyclohexen-1-one, decarboxylation of α-amino acids proceeds smoothly and affords the corresponding amino compounds in good yields. Optically active amino compounds, (3R)-(−)-3-hydroxypyrrolidine and (2R)-(−)-2-hydroxypropylamine are obtained in 93% and 80% yields, respectively.
PREPARATION OF 18- AND 22-MEMBERED TETRAAZA MACROCYCLES AND THEIR COPPER(II) COMPLEXES
Authors: Fujiwara Manabu , Wakita Hisanobu , Masuda Isao , Matsushita Takayuki , Shono Toshiyuki
Published: July 2006

18- and 22-membered tetraaza macrocycles were prepared from acetylacetone and 1,4-diaminobutane or 1,6-diaminohexane, respectively. Their copper(II) complexes were characterized by electronic spectroscopy and the copper(II) complex of the 18-membered macrocycle was found to be pseudo-tetrahedral.
A SIMPLE AND FACILE SYNTHESIS OF d,1-MUSCONE
Authors: Taechachoonhakit Siriwan , Ratananukul Piniti
Published: July 2006

An efficient method for the synthesis of d,1-muscone has been developed.
INTRAMOLECULAR CHARGE TRANSFER TRANSITION FOR SYMMETRY ALLOWED CHARGE TRANSFER INTERACTION IN THE MOLECULES OF Cs SYMMETRY AND A POTENTIAL MODEL TO INTRODUCE NEW INTERSTACK INTERACTION
Authors: Nakasuji Kazuhiro , Yamochi Hideki , Murata Ichiro , Yasuoka Noritake , Kusunoki Masami
Published: July 2006

Three intramolecular charge transfer (CT) compounds, which exhibit clear CT transition for symmetry allowed CT interaction, have been synthesized and examined. In addition, a possible way to introduce new type of interstack interactions in the solid state was proposed from the crystal structure of 7,10-ethenocyclohepta-[de]naphthalene-8,9-dicarbonitrile.
ASYMMETRIC ALLYLATION OF PROCHIRAL ALDEHYDES WITH A NEW ENANTIOSELECTIVE ALLYLATING AGENT PREPARED FROM STANNOUS TRIFLATE, A CHIRAL DIAMINE, AND ALLYLDIALKYLALUMINUM
Authors: Mukaiyama Teruaki , Minowa Nobuto , Oriyama Takeshi , Narasaka Koichi
Published: July 2006

A new enantioselective allylating agent, prepared by treatment of a mixture of stannous trifluoromethanesulfonate and a chiral diamine with allyldialkylaluminum, reacts with prochiral aldehydes to give secondary homoallyl alcohols in good optical yield.
ELECTROLYTE EFFECTS ON THE ELECTROCHEMICAL ACTIVITY OF MICELLE-SOLUBILIZED SUBSTANCE
Authors: Hoshino Katsuyoshi , Suga Kosaku , Saji Tetsuo
Published: July 2006

The cyclic voltammetry of a cationic surfactant with ferrocenyl moiety (Fc) in an anionic micellar solution leads to the conclusion that Fc incorporated in the micelle is electrochemically inactive in the absence of electrolytes and active in the presence of electrolytes.
Selective Liquid-Membrane Transport of Nitro-phenols by a Simple and Costless Carrier. An Application of the Results of Centrifugal Partition Chromatography
Authors: Araki Takeo , Kubo Yasuo , Takata Masao , Gohbara Shinji , Yamamoto Toshiyuki
Published: July 2006

By applying the separation data of countercurrent type chromatography (centrifugal partition chromatography(CPC)) to liquid-membrane transport system(LMT), an effective simple carrier for selective LMT was found. This observation will be an important suggestion for finding out a costless carrier of selective LMT for weakly ionic or non-ionic substrates.
Preparation and Photochemistry of Biphenyls Bridged by Si–X–Si Chains
Authors: Sakurai Hideki , Sakamoto Kenkichi , Kira Mitsuo
Published: July 2006

Photolysis of several biphenyls bridged by Si–X–Si chains are described where the X’s are O, S, NH, and Fe(CO)4. Dimethylsilathione was successfully generated by this method and the first evidence of reductive elimination from bis(silyl)iron to give disilane was demonstrated.
Regioselective Nucleophilic Opening of erythro-and threo-2,3-Epoxy Alcohols
Authors: Kirshenbaum Kenneth S , Sharpless K Barry
Published: July 2006

The epoxide opening reactions of erythro and threo epoxy alcohols with a variety of nucleophiles, both in the presence and absence of Ti(OiPr)4, were examined. In general, opening of threo epoxy alcohols proceeded faster and with higher selectivity than the same reaction with the corresponding erythro isomers.
Novel Synthesis of (R)-(+)-γ-Butyrolactone-γ-3-propionates by Fermenting Baker’s Yeast and Enantiomeric Purity Determination Using NMR Technique
Authors: Moriuchi Fumio , Muroi Hisae , Aibe Hiroshi
Published: July 2006

Optically pure (R)-(+)-γ-butyrolactone-γ-3-propionates 1 were prepared by reducing the precourser, 3-ketoheptane-1,5-dicarboxylic acid mononoesters, with fermenting baker’s yeast. The optical purity (more than 98%) was determined by means of HPLC analysis and NMR determination.
Role of Iron and Ascorbic Acid in the Oxidation of Methyl Linoleate Micelles
Authors: Yamamoto Keiji , Takahashi Mareyuki , Niki Etsuo
Published: July 2006

Oxidations of methyl linoleate micelles in aqueous dispersions induced by iron and ascorbic acid have been studied aiming specifically at elucidating the mechanism of initiation reactions. It was suggested that the initial radicals were generated by the decomposition of hydroperoxide by iron and that ascorbic acid functioned as a reducing agent for ferric ion to give more reactive ferrous ion.
An Efficient Synthesis of Perfluoroalkyl Ketones Using Perfluoroalkyllithiums
Authors: Uno Hidemitsu , Shiraishi Yasukazu , Simokawa Kazuhiro , Suzuki Hitomi
Published: July 2006

Perfluoroalkylation of esters with perf luoroalkyllithiums occurs smoothly in ether at −78 °C, giving the corresponding perfluoroalkyl ketones in good yields.
α,β-Unsaturated Orthoesters as Michael Acceptors. The Trityl Salt-Catalyzed Michael Reaction of α,β-Unsaturated Orthoesters with Silyl Enol Ethers
Authors: Kobayashi Shu , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl salts, α,β-unsaturated orthoesters react with various silyl enol ethers to afford the corresponding Michael adducts in good yields.
Dielectric Absorption in Polycrystalline 2-Fluoronaphthalene in Relation to the Dynamic Nature of Disorder in the Crystal
Authors: Aihara Ariyuki
Published: July 2006

A conspicuous dielectric absorption in the low-frequency region (from 0.1 to 104 Hz) has been observed in the crystal of 2-fluoronaphthalene at temperatures between 8.5 and 55.1°C, which could be fitted to a Debye type with a slight distribution of relaxation time. The result seems to confirm that the disorder observed by the X-ray crystal structure analysis of Chanh and Haget–Bouillaud is dynamic in nature. Further, a phase change at about 40°C is suggested from the sudden decrease in the magnitude of dielectric permittivity.
Suppression of Luminescence Background in Raman Spectra by Pulsed Laser Excitation
Authors: Tahara Tahei , Hamaguchi Hiro-o , Tasumi Mitsuo
Published: July 2006

It has been found that excitation with nanosecond laser pulses suppresses the luminescence background in the Raman spectra of some organic compounds by factors of ten to hundred compared with ordinary cw-laser excitation. This finding may lead to a novel effective means for luminescence quenching in Raman spectroscopy.
Reaction of Diphenylcyclopropenone with Nitroketeneaminals. Synthesis of 6-Amino-2-pyridones and Their m-Chloroperbenzoic Acid Oxidation to 2,3-Diphenylmaleimides
Authors: Takahashi Masahiko , Nozaki Chiyoshi , Shibazaki Yoshio
Published: July 2006

Reaction of diphenylcyclopropenone with nitroketeneaminals gave 6-amino-2-pyridones, which were oxidized by m-chloroperbenzoic acid to 2,3-diphenylmaleimides.
A RPLC C30 Column for the Separation of Oligonucleotides
Authors: Makino Keisuke , Ozaki Hiroaki , Imaishi Hiromasa , Takeuchi Tamio , Fukui Toshikazu
Published: July 2006

In reversed-phase high-performance liquid chromatography of large oligonucleotides, synthesized chemically and subsequently deblocked, a silica-based column prepared with triacontyldimethylchlorosilane, has been found to be superior to those with octadecylsilyl ligand.
The Preparation of Optically Pure 3-Hydeoxybutanoic Acid and Its Homologues as the Dibenzylammonium Salt
Authors: Kikukawa Tadashi , Iizuka Yoshitomi , Sugimura Takashi , Harada Tadao , Tai Akira
Published: July 2006

Optically pure (R)- and (S)-3-hydroxybutanoic acid and its homologues are prepared by the method consisting of the enantioface differentiating hydrogenation of methyl 3-oxoalkanoate to methyl 3-hydroxyalkanoate(80–90% e.e.) over asymmetrically modified nickel catalyst and the preferential crystallization of optically pure 3-hydroxyalkanoic acids from the hydrogenation products as the dibenzylammonium salts.
Tubastrine, a New Guanidinostyrene from the Coral Tubastrea aurea
Authors: Sakai Ryuichi , Higa Tatsuo
Published: July 2006

Tubastrine has been isolated as an antiviral constituent of the coral Tubastrea aurea, and its structure was shown to β-(aminoiminomethyl)amino-3,4-dihydroxystyrene.
Reduction of Imines and Enamines with Hydrogen Telluride. An Application to Reductive Alkylation of Amines with Carbonyl Compounds
Authors: Kambe Nobuaki , Inagaki Tohru , Miyoshi Noritaka , Ogawa Akiya , Sonoda Noboru
Published: July 2006

Hydrogen telluride was found to reduce imines and enamines to the corresponding amines under mild conditions. As an application of this reduction,a new method for reductive alkylation of primary and secondary amines with ketones or aldehydes has been developed.
Extraction of Metal Ions by Tri-Cationic Anion-Exchange Extractant
Authors: Ohki Akira , Maeda Shigeru , Takeshita Toshio , Takagi Makoto
Published: July 2006

Novel anion-exchange extractants were synthesized, which are lipophilic phosphonium ions bearing three cationic centers in a molecule. By using the tri-cationic extractants, the selectivity toward the extraction of triply charged anions such as hexacyanoferrate(III) was much increased.
Artificial Glutamate Mutase Composed of Hydrophobic Vitamin B12 and Synthetic Bilayer Membrane
Authors: Murakami Yukito , Hisaeda Yoshio , Ohno Teruhisa
Published: July 2006

The alkylated hydrophobic vitamin B12 prepared by the reaction between heptapropyl cobyrinate and diethyl bromomethylaspartate, afforded diethyl glutamate, the rearrangement product, in single-compartment vesicles under anaerobic photolysis conditions.
Pinacol-Type Rearrangement of 1-Methoxybicyclo[3.2.2]nona-3,6-dien-2-ols. An Efficient Route to Homobarrelenones
Authors: Uyehara Tadao , Kawai Yoshinori , Yamada Jun-ichi , Kato Tadahiro
Published: July 2006

Pinacol-type rearrangement of 1-methoxybicyclo[3.2.2]nona-3,6-dien-2-ols proceeds preferentially to give bicyclo[3.2.2]nona-6,8-dien-2-ones by treating with TsOH in boiling benzene. This transformation is incorporable in a new synthesis of homobarrelenone and a large number of its derivatives starting from 1-methoxybicyclo[3.2.2]nona-3,6-dien-2-ones.
New Bis(benzene-1,2-dithiolato)Ni(II) Complexes Having Intense Near-Infrared Absorptions
Authors: Tabushi Iwao , Yamamura Kazuo , Nonoguchi Hiroshi
Published: July 2006

New bis(benzene-1,2-dithiolato)Ni(II)·n-Bu4N having one or two N,N-dimethylamino substituent(s) were prepared. The main characteristic in their electronic absorptions was the intense near-infrared absorption band with a maximum of intensity at 990–1163 nm.
Phosphonylation of Glucose 1-Monophosphate with Diphosphonate
Authors: Baba Yoshinobu , Onoe Mika , Sumiyama Tomoko , Tsuhako Mitsutomo , Yoza Norimasa , Ohashi Shigeru
Published: July 2006

Glucose 1-monophosphate was “phosphonylated” by diphosphonate in an aqueous solution under the mild conditions (60–70 °C, pH 6). Diphosphonate phosphonylated a phosphate group on glucose 1-monophosphate selectively. The yield of a phosphonylated product was 61%. The chemical structure of a phosphonylated product was discussed on its 31P-NMR spectrum and high performance liquid chromatogram.
A Novel Host Compound with High Inclusion Ability, N,N,N′,N′-Tetracyclohexyl-2,2′-biphenyldicarboxamide, and Crystal Structure of Its 1:1 Phenol Complex
Authors: Toda Fumio , Kai Akihiro , Tagami Yasunori , Mak Thomas C W
Published: July 2006

The title host compound forms crystalline inclusion complexes with a wide variety of organic guest molecules. X-Ray analysis of its 1:1 complex with phenol shows that the two molecular components are held together by a O–H···O hydrogen bond of length 2.59(1) Å.
Preparation and Reactions of Optically Active 6-(2,4-Dimethoxybenzyl)-2-[(1′,2′-O-isopropylidene)ethyl]-4-methoxy-3-oxa-7-oxo-6-azabicyclo[3.2.0]heptane. Syntheses of 2-Amino-2,3-dideoxy(branched-chain)sugar Analogues
Authors: Shiozaki Masao , Ishida Noboru
Published: July 2006

A new method for the synthesis of methyl 2,3-dideoxy-2-benzoylamido-3-acetoxymethy1-5,6-O-isopropylidene-α-d-mannofuraroside and other analogues from 2,3-O-isopropylidene-d-glyceraldehyde via a commom β-lactam intermediate is described.
Structure of Monoacylated Anthocyanins Isolated from Red Cabbage, Brassica oleracea
Authors: Idaka Eiichi , Suzuki Kaneyoshi , Yamakita Hiroshi , Ogawa Toshihiko , Kondo Tadao , Goto Toshio
Published: July 2006

Five monoacylated anthocyanins from Brassica oleracea were isolated and their structures determined to be 3-0-(6-0-acyl-2-0-(β-d-glucopyranosyl)-β-d-glucopyranosyl)-5-0-(β-d-glucopyranosyl)cyanidins, in which the acyl group is p-coumaryl, ferulyl, sinapyl, 4-0-(β-d-glucopyranosyl)-E-p-coumaryl, or 4-0-(β-d-glucopyranosyl)-E-ferulyl.
Ionic Conductivity and Structure of New Double Chloride Li6FeCl8 in the LiCl–FeCl2 System
Authors: Kanno Ryoji , Takeda Yasuo , Mori Masashi , Yamamoto Osamu
Published: July 2006

The phase diagram of the LiCl–FeCl2 system was determined. The system contained two intermediate compounds, one the new phase Li6FeCl8 with the Mg6MnO8-type structure and the other Li2FeCl4 with the spinel structure. Electrical conductivity measurements on Li6FeCl8 showed a high ionic conductivity of 2.0×10−3 S cm−1 at 200 °C.
Oxidative Coupling of Methane over a Li2O–BeO System Catalyst
Authors: Matsuura Ikuya , Doi Takao , Utsumi Yasuhide
Published: July 2006

The lithium-added beryllium oxide was studied as a catalyst for the oxidative coupling of methane. For example, 3 mol% Li-added BeO catalyst gave 813 mmol h−1 g−1 of C2-STY and 63% of selectivity under the reaction conditions of 760 °C, P(CH4) = 76.0 kPa, P (CH4)/P(O2) = 3 and W/F = 0.0033 gh l−1. The compound oxide Li2Be2O3 was formed by Li2O mixed with BeO at 700 °C. This compound oxide might be an active catalyst for the oxidative coupling of methane.
A Mild and Convenient Method for the Reduction of Organic Halides by Using a SmI2-THF Solution in the Presence of Hexamethylphosphoric Triamide (HMPA)
Authors: Inanaga Junji , Ishikawa Mitsuhiro , Yamaguchi Masaru
Published: July 2006

A remarkable effect of HMPA was observed in the reduction of organic halides with a SmI2-THF solution. Various types of organic halides were reduced rapidly to the corresponding alkanes in almost quantitative yields under mild reaction conditions.
Synthesis and Reactivity of Imidazole-Appended Dimethyl-β-cyclodextrin
Authors: Ikeda Hiroshi , Kojin Ryoici , Yoon Chul-Joong , Ikeda Tsukasa , Toda Fujio
Published: July 2006

Dimethyl-β-cyclodextrin bearing imidazolylethyl group (2) was firstly synthesized and the catalytic activity of 2 was studied. 2 caused extensive acceleration of the hydrolysis reaction of p-nitrophenyl acetate, whereas dimethyl-β-cyclodextrin caused inhibition of the hydrolysis.
Conformational Competition between n-Alkyl and Oxyethylene Chains in Nonionic Surfactants in the Solid State. A Raman Spectroscopic Study
Authors: Fukuhara Koichi , Matsuura Hiroatsu
Published: July 2006

Raman spectra of 23 nonionic surfactants CH3(CH2)n−1(OCH2CH2)mOH were measured in the solid state. The molecular conformation of these compounds was elucidated on the basis of the conformational competition between the n-alkyl chain which intrinsically favors the extended structure and the oxyethylene chain which favors the helical structure.
Introduction of an Acetonyl Grouping at the C(3) Position of 2,3-Dehydropiperidine via Rearrangement of (β-Aminocyclopropyl)carbonyl Intermediate
Authors: Inokuchi Tsutomu , Takagishi Sadahito , Akahoshi Fumihiko , Torii Sigeru
Published: July 2006

A new and efficient method for introducing 2-oxoalkyl group at the C(3) position of 2,3-dehydropiperidine has been explored based on rearrangement tactics of (β-aminocyclopropyl)carbonyl intermediate.
Acid-Catalyzed Autoxidation of 12-Hydroxyeudesman-3,6-dione to 6,12-Epoxyeudesma-4,6-dien-3-one
Authors: Nagano Hajime , Sugihara Hiroko , Ito Hiroko , Shiota Michio
Published: July 2006

Treatment of a benzene solution of 12-hydroxyeudesman-3,6-dione with p-toluenesulfonic acid in air gave 6,12-epoxyeudesma-4,6-dien-3-one (2) in 57% yield. Dienone 2 was further oxidized to give 7-hydroxyeudesmanes.
Crystal Structures of M(DCNQIs)2 (DCNQIs=N,N′-dicyanoquinonediimines; M=Li, Na, K, NH4, Cu, Ag)
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Mori Takehiko , Inokuchi Hiroo
Published: July 2006

Crystal structures of highly conducting title compounds were determined. The basic structure of all compounds consists of uniform face-to-face columns of acceptor molecules. These columns are connected to each other through N-coordinated cations. The geometry of coordination depends on the counter cation.
Organotin-Mediated Preparation of Monothioacetals
Authors: Sato Tsuneo , Kobayashi Takamitsu , Gojo Tamehisa , Yoshida Enji , Otera Junzo , Nozaki Hitosi
Published: July 2006

Monothioacetals are obtained by treating the corresponding acetals with organotin thiophenoxides in the presence of BF2·OEt2. The reaction proceeds under mild conditions to provide the desired compounds with high selectivity.
Halogen-Exchange Fluorination of Primary Alkyl Halides Using 1B Metal Fluorides-Pyridine Derivatives
Authors: Yoneda Norihiko , Fukuhara Tsuyoshi , Yamagishi Ken , Suzuki Akira
Published: July 2006

Deep purplish red semicrystaline precipitates were obtained by the treatment of Cu2O with HF. After calcination at 100 °C or higher temperature, this compound was successfully used as a highly effective halogen-exchange fluorination reagent for primary alkyl halides in the presence of pyridine derivatives. AgF and a mixture of CuF2 with copper powder also exhibited high activity in the reaction.
13C-Nuclear Magnetic Resonance Study of Low-Spin Iron(III) Protoporphyrin IX Dicyano Complex. Individual Hyperfine Shifted 13C Resonance Assignments
Authors: Yamamoto Yasuhiko , Fujii Naoyuki
Published: July 2006

1H-13C COSY spectra of the low-spin iron(III) protoporphyrin IX dicyano complex heve lead to the assignments of the individual hyperfine shifted 13C resonances which permit a direct comparison of the hyperfine shifts between 13C and attached 1H resonances. Parallel and anti-parallel relationships between 13C and attached 1H shifts for the heme methyl and meso resonances, respectively, resulted from the different mechanisms operating on the unpaired spin delocalization have been clearly observed.
Belousov–Zhabotinskii Oscillating Reaction without Strong Acid Such as Sulfuric Acid
Authors: Tsukada Masao
Published: July 2006

We have found the existence of oscillatory phenomena in the metal ion catalyzed reaction between malonic acid and potassium bromate without strong acid such as sulfuric acid. In the Ce3+, or Mn2+ catalyst system, the pH oscillations have been observed.
ESR Study on the Regularity of the LB Films of Amphiphilic TCNQ Salts
Authors: Fujita Shigeru , Suga Kosaku , Fujihira Masamichi , Nakamura Takayoshi , Kawabata Yasujiro
Published: July 2006

The ESR spectra of the LB films of N-docosyl- and N-octadecylpyridinium-(TCNQ)n (n=1,2) deposited on glass capillaries or glass slides were measured. The intensity of the ESR spectrum increased markedly with the number of layers. From this and other results, it was suggested that the ordering of the LB film was enhanced by cumulation of monolayers. The ESR spectrum of the LB film deposited on a glass slide showed marked dependence on the orientation of the film in the static magnetic field.
Photoreactivity of 1-Pyrenylmethyl Esters. Dependence on the Structure of the Carboxylic Acid Moieties and the Nature of the Excited States
Authors: Iwamura Michiko , Tokuda Kazuko , Koga Noboru , Iwamura Hiizu
Published: July 2006

While the photolysis of 1-pyrenylmethyl phenylacetates in methanol gave the original phenylacetic acids, irradiation of the 1-naphthoate and 9-anthracenecarboxylate leads to the formation of the intramolecular exciplexes that are inert to the photolysis. The Φf and τf values of these esters have been determined.
Enaminone Intermediate in the One-Methylene Incorporated Dimerization Reaction of Ketone Enolate. Cross Reaction to Unsymmetrical 1,5-Diketones
Authors: Kiyooka Syun-ichi , Yamashita Tsuneo
Published: July 2006

An enaminone has been isolated as an intermediate from the one-methylene incorporated dimerization reaction of ketone enolate using N-phenyl-N-methylformamide. The reaction of the enaminone with the other ketone enolates gives unsymmetrical 1,5-diketones in good yields.
Self-Sustained Nonlinear Oscillation of Hydrogen Ions in the Polyelectrolyte Gels
Authors: Umezawa Kayo , Osada Yoshihito
Published: July 2006

Long-term, self-sustained oscillations of hydrogen ions were detected in the water-swollen polyelectrolyte gels when an electric potential was applied for certain period of time and then turned off. A hypothetical nonlinear ion transport mechanism was proposed.
Meerwein-Ponndorf-Verley Reduction of Ketones and Aldehydes Catalyzed by Lanthanide Tri-2-propoxides
Authors: Okano Tamon , Matsuoka Masahiro , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

Lanthanide tri-2-propoxides, Ln(i-PrO)3 (Ln=Nd, Eu, Gd, Dy, Er, Tm, Yb), are very efficient for the catalytic Meerwein-Ponndorf-Verley reduction. The catalytic activity of Gd(i-PrO)3 is about 103 times as high as that of Al(i-PrO)3. Compared with Gd(i-PrO)3, Yb(i-PrO)3 is less active for the reduction of ketones but is efficient for that of aldehydes.
The First Molecular Superconductor Based on π-Acceptor Molecules and Closed-Shell Cations, [(CH3)4N][Ni(dmit)2]2, Low-Temperature X-Ray Studies and Superconducting Transition
Authors: Kobayashi Akiko , Kim Hyernjoo , Sasaki Yukiyoshi , Kato Reizo , Kobayashi Hayao , Moriyama Shinji , Nishio Yutaka , Kajita Koji , Sasaki Wataru
Published: July 2006

Low-temperature structural study of [(CH3)4N][Ni(dmit)2]2 suggested that the rotational freedom of methyl group seems to play an important role in the “metal-semimetal” transition. Superconducting transition was observed at 5 K (7 kbar).
A New Route to (−)-Aristeromycin and (−)-Neplanocin A via the Asymmetric Diels–Alder Cycloaddition
Authors: Arai Yoshitsugu , Hayashi Yoshikazu , Yamamoto Masatoshi , Takayama Hiromitsu , Koizumi Toru
Published: July 2006

An enantioselective synthesis of a central intermediate in the synthesis of (−)-aristeromycin and (−)-neplanocin A via the asymmetric Diels–Alder reaction of menthyl (S)s-3-(2-pyridylsulfinyl)propenoate with cyclopentadiene, is described.
Spin-trapping of Phosphorous-containing Inorganic Radicals by a Water-soluble Spin-trap, 3,5-Dibromo-4-nitrosobenzenesulfonate
Authors: Ozawa Toshihiko , Hanaki Akira
Published: July 2006

Two short-lived phosphorous-containing inorganic radicals (PO32\ewdot and HPO2\ewdot), which are generated by the oxidation with Ti3+-H2O2 react system, are easily trapped by a water-soluble spin-trap, 3,5-dibromo-4-nitrosobenzenesulfonate (DBNBS) and their adducts are characterized by ESR spectroscopy.
The Active Species of Sb–Mo–O Catalyst for the Oxidative Esterification of Ethanol
Authors: Wang Lianchi , Tsuda Masashi , Eguchi Koichi , Arai Hiromichi , Seiyama Tetsuro
Published: July 2006

The freshly prepared catalyst of Sb–Mo–O system was only a mixture of MoO3 and Sb2O4, which was not selective for the ester formation. However, in the course of the oxidation of ethanol, some reduced phases such as Sb4Mo10O31 were formed in the catalyst, accompanied with an increase of ester formation. It is suggested that the reduced phases were effective for the ester formation.
Polarized Laser Induced Fluorescence of N2+(X2Σg+) Produced in the Electron Impact Ionization of N2
Authors: Nagata Takashi , Nakajima Atsushi , Kondow Tamotsu , Kuchitsu Kozo
Published: July 2006

When nitrogen molecule was ionized in collision with electrons of 80–300 eV, the angular distribution of the rotation vector of N2+(X2Σg+) was found to be slightly anisotropic with respect to the direction of the electron beam in the vicinity of 80 eV. This anisotropy indicates that the ejection of a πu electron is the dominant channel in the ionization process in this energy range.