bluuebunny/crossref_metadata_2025 huggingface dataset:
PROTON CONDUCTION IN THERMALLY TREATED ANTIMONIC ACID SAMPLES
Authors: Ozawa Yoshihiro , Miura Norio , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

Antimonic acid samples thermally treated up to 893 K exhibited high proton conductivities of order of 10−1 S·m−1 at room temperature when the relative humidity was high. The humidity dependence of the conductivities changed with the heat treatment temperature, in coincidence with the changes in fine structure of the antimonic acid samples.
STRUCTURES AND CONFORMATIONS OF NEW NINE-MEMBERED RING DITERPENOIDS FROM THE MARINE ALGA DICTYOTA DICHOTOMA
Authors: Enoki Nobuyasu , Ishida Ryoichi , Matsumoto Takeshi
Published: July 2006

New nine-membered ring diterpenes acetyldictyolal (2), hydroxyacetyldictyolal (4) isodictyohemiacetal (5) and dictyodiacetal (7) have been isolated. Their structures and approximate conformations have been determined by spectral and chemical means.
ALKALINE PHOSPHATASE DISSOLVED IN NATURAL WATER
Authors: Haraguchi Hiroki , Kobayashi Kensei , Matsui Masahiro , Fuwa Keiichiro
Published: July 2006

Alkaline phosphatase activity dissolved in sea and lake water was determined, and alkaline phosphatase was identified as dissolved chemical species of trace metals (zinc) in natural water using high performance liquid chromatography (HPLC).
PREPARATION AND SOME PROPERTIES OF POLYTHIA[n]FERROCENOPHANES
Authors: Sato Masaru , Watanabe Hisayuki , Ebine Seiji , Akabori Sadatoshi
Published: July 2006

Polythiaferrocenophanes, 5, and 8–12, were prepared from 1,1′-ferrocenedithiol. Of these compounds, 1,4,7-trithia[7]ferrocenophane 8 showed an abnormal bathochromic shift in the electronic spectrum, and a downfield shift of the bridge-head carbons and an upfield shift of the other cyclopentadienyl carbons in the 13C-NMR spectrum. Compounds 9–12 also showed complexing affinity to silver ion according to the size of polythia-macrocycles.
HORSE LIVER ALCOHOL DEHYDROGENASE (HLADH) MEDIATED CHEMICOENZYMATIC ASYMMETRIC SYNTHESIS OF (+)-TWISTANE FROM cis-DECALIN-2,7-DIONE
Authors: Nakazaki Masao , Chikamatsu Hiroaki , Taniguchi Masatoshi
Published: July 2006

HLADH mediated reduction differentiated between the enantiotopic carbonyl groups in cis-decalin-2,7-dione (1) provide (−)-(7S,9S,10R)-7-hydroxy-cis-decalin-2-one (3) which was converted, via (+)-4, and (+)-6, into (+)-twistane (8) of high optical purity.
SELECTIVE SYNTHESES OF DENDROLASIN AND SESQUIROSEFURAN BY THE COUPLING OF 3-FURYLMETHYLMAGNESIUM BROMIDE WITH GERANYL DIETHYL PHOSPHATE
Authors: Araki Shuki , Butsugan Yasuo
Published: July 2006

Coupling reaction of 3-furylmethylmagnesium bromide with geranyl diethyl phosphate in the presence and the absence of copper(I) iodide affords dendrolasin and sesquirosefuran, respectively, in ca. 80 % selectivity.
SYNTHESIS OF NEW BINUCLEATING LIGANDS CONTAINING A PORPHYRIN
Authors: Okamoto Masaya , Nishida Yuzo , Kida Sigeo
Published: July 2006

New binucleating ligands containing a porphyrin and another coordination site in close proximity, and their metal complexes were prepared and characterized.
TITANIUM-MEDIATED AND NEIGHBORING-GROUP ASSISTED δ-METHYLATION OF HOMOALLYL ALCOHOLS: A NEW REGIO- AND STEREOSELECTIVE CC-LINKING REACTION
Authors: Fujita Katsuramaru , Moret Etienne , Schlosser Manfred
Published: July 2006

Upon treatment with dimethyltitanium dichloride or trimethylaluminum in the presence of titanium tetrachloride, a hydrogen atom at the olefinic 4-position is replaced by a methyl group. Terminal homoallyl alcohols afford (E)-isomers. If the double bond is an internal one, the carbon chain (at the other side of the hydroxy group) leaves its original position to the entering methyl group and switches to the other one at the same carbon atom.
NOVEL RHODIUM DIOXYGEN COMPLEXES. REACTION OF THE DIOXYGEN LIGAND WITH THE COORDINATED OLEFIN
Authors: Sugimoto Ryuichi , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Novel dinuclear rhodium dioxygen complexes having olefinic ligand are prepared by the reaction of cationic rhodium diene complexes, [(1,5-cyclooctadiene)2Rh]+Y− or [(norbornadiene)2Rh]+Y− (Y− = BF4−, ClO4−), with potassium superoxide in dichloromethane.Transfer of the dioxygen ligand to the coordinated olefin is confirmed by pyrolysis of the complex under an atmosphere of 18O2.
TOTAL SYNTHESIS OF (±)-MAYSINE AND (±)-N-METHYLMAYSENINE
Authors: Isobe Minoru , Kitamura Masato , Goto Toshio
Published: July 2006

Maysine (1) and N-methylmaysenine (2), as congeners of the ansa-macrocyclic antitumor agent, maytansine, were synthesized from a common intermediate 3.
A SIMPLE CRITERION OF AN AUTOCATALYTIC PROCESS AT A STATIC MERCURY DROP ELECTRODE (SMDE)
Authors: Himeno Sadayuki , Saito Atsuyoshi
Published: July 2006

With the use of the SMDE, a simple criterion for distinguishing an autocatalytic process from a catalytic one is proposed; the limiting current for an autocatalytic wave increases with drop time, and the i-t curve shows a current increase with time on every drop. On the other hand, the limiting currents for diffusion, kinetic and catalytic waves decrease with drop time.
THE STRUCTURES OF FUKURINOLAL AND FUKURINAL, TWO NEW DITERPENOIDS FROM THE BROWN SEAWEED DILOPHUS OKAMURAI DAWSON
Authors: Ochi Masamitsu , Masui Norio , Kotsuki Hiyoshizo , Miura Iwao , Tokoroyama Takashi
Published: July 2006

The structures of fukurinolal and fukurinal, two new diterpenoids isolated from the brown seaweed Dilophus okamurai Dawson, have been established as 1 and 2, the latter possessing a novel bicyclic ring system, on the basis of spectral and chemical evidence.
SYNTHESIS OF THIENO[3,2-b]PYRIDINES
Authors: Yokoyama Masataka , Tohnishi Masanori , Kurihara Akemi , Imamoto Tsuneo
Published: July 2006

Several thieno[3,2-b]pyridines could be easily synthesized by methallation using LDA directly from 3-(disubstituted amino)-2-cyano-3-methylthioacrylonitriles.
SYNTHESIS OF 2,6-DIMETHYL-6-(8-METHYL-4-METHYLENE-7-NONENYL)-2-CYCLOHEXEN-1-YLMETHANOLS. A COMMENT ON THE STRUCTURE OF MAGYDAR-2,10(20),13-TRIEN-17-OL, THE DITERPENE OF MAGYDARIS PANACIFOLIA
Authors: Nagano Hajime , Ishikawa Yukari , Matsuo Yukiko , Shiota Michio
Published: July 2006

α-Santonin was stereoselectively converted to a pair of diastereomers of 2,6-dimethyl-6-(8-methyl-4-methylene-7-nonenyl)-2-cyclohexen-1-ylmethanols (Ia and Ib). Both spectral data of Ia and Ib were found to be different from those reported for magydar-2,10(20),13-trien-17-ol isolated from Magydaris panacifolia (Vahl) Lange, This indicates that the structure of the natural diterpene must be revised.
4-CHLOROPHENYL 5-CHLORO-8-QUINOLYL HYDROGEN PHOSPHATE: A USEFUL PHOSPHORYLATING AGENT FOR GUANOSINE 3′-PHOSPHOTRIESTER
Authors: Takaku Hiroshi , Kamaike Kazuo , Kasuga Kenichi
Published: July 2006

5′-O-Dimethoxytrityl-2′-O-tetrahydropyranyl-N2-benzoylguanosine smoothly reacts with 4-chlorophenyl 5-chloro-8-quinolyl hydrogen phosphate in the presence of 8-quinolinesulfonyltetrazolide (QS-te) to give 5′-O-dimethoxytrityl-2′-O-tetrahydropyranyl-N2-benzoylguanosine 3′-(4-chlorophenyl, 5-chloro-8-quinolyl) phosphate in high yield without a side product such as O6-phosphorylated guanosine.
PALLADIUM-PROMOTED TRANSFORMATION OF α,β-EPOXYSILANES TO α,β-UNSATURATED CARBONYL COMPOUNDS
Authors: Hirao Toshikazu , Yamada Naoto , Ohshiro Yoshiki , Agawa Toshio
Published: July 2006

Treatment of α,β-epoxysilanes with palladium(II) salt in DMF affords α,β-unsaturated carbonyl compounds, in which the carbonyl group appears on the carbon originally bearing the silyl group.
REACTIONS OF DIAMINO DISULFIDES, DIAMINO SULFIDES, AND DIAMINO SULFOXIDES WITH p-TOLUENESULFINIC ACID
Authors: Furukawa Mitsuru , Sato Kimitoshi , Okawara Tadashi
Published: July 2006

The reactions of diamino disulfides (2) and diamino sulfides (3) with p-toluenesulfinic acid (1) were found to give new types of compounds, amino p-toluenesulfonyl disulfides (5) and amino p-toluenesulfonyl sulfides (10), respectively. On the other hand, the reaction between dimorpholino sulfoxide (4) and 1 gave p-toluenesulfinylmorpholide (13).
THE CRYSTALLITE SIZE OF α-IRON IN THE PRESENCE OF K2O IN THE DOUBLY PROMOTED AMMONIA SYNTHESIS IRON CATALYSTS
Authors: Sasa Yoshihiko , Uda Masayuki , Toyoshima Isamu
Published: July 2006

Besides the effect of electronic factor of K2O in the doubly promoted ammonia synthesis iron catalysts, K2O shows an another function to control a crystallite size of α-iron which is formed by reduction of the catalysts with hydrogen.
HYDRIDING BEHAVIORS OF Zr(FexMn1−x)2 ALLOYS
Authors: Suzuki Akira , Nishimiya Nobuyuki , Ono Shuichiro
Published: July 2006

The hydriding behaviors and crystallographic characteristics of Zr(FexMn1−x)2 alloys, wherein x is 0 to 1, vary depending on the x value. On substituting Mn of ZrMn2 with Fe, the dissociation pressure of its hydride increases monotonously at temperatures around 400K.
SYNTHESIS OF (±)-SEMBURIN
Authors: Ohfune Yasufumi , Takaki Kazutoshi , Kameoka Hiromu , Sakai Tsutomu
Published: July 2006

Semburin, a new 2,8-dioxabicyclo[3,3,1]nonane skeleton, has been synthesized in the stereoselective manner from α-pyrone.
RUTHENIUM HYDRIDE-CATALYZED DOUBLE BOND MIGRATION OF 2,5-DIMETHOXY-2,5-DIHYDROFURANS. A NEW PROCESS FOR THE PREPARATION OF γ-KETOESTERS
Authors: Hirai Kenji , Suzuki Hiroharu , Kashiwagi Hiroshi , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

γ-Ketoesters are obtained in excellent yields by means of double bond migration of 2,5-dimethoxy-2,5-dihydrofurans mediated by a ruthenium hydride complex, HRuCl(PPh3)3(C6H5CH3) or HRuCl(CO)(PPh3)3′ and subsequent hydrolysis in acidic media.
THE HIGHLY STEREOSELECTIVE SYNTHESIS OF CIS-VINYLOXIRANES
Authors: Yamaguchi Masahiko , Mukaiyama Teruaki
Published: July 2006

In the presence of triethylaluminum, oxyallyl anions derived from 2-allyloxybenzimidazoles react with aldehydes in highly regio-and stereoselective manner to afford α-adducts in good yields. The adducts are stereospecifically converted to cis-vinyloxiranes in good yields.
A NEW METHOD FOR THE GENERATION OF A BORON ENOLATE OF AN ESTER—A NEW SYNTHESIS OF 2-DEOXY-d-RIBOSE—
Authors: Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

A boron enolate of an ester was generated in situ by the treatment of ethoxyacetylene with mercury(II) acetate and diphenylborinic acid, and the boron enolate thus formed further reacted with aldehydes to give β-hydroxyesters and β-acetoxyesters in good yields. The reaction was successfully applied to the stereoselective synthesis of 2-deoxy-d-ribose.
NEW POLY- AND BIS(THIACROWN ETHER)S AS EXTRACTION REAGENTS
Authors: Oue Masatoshi , Ishigaki Akira , Matsui Yousuke , Maeda Takumi , Kimura Keiichi , Shono Toshiyuki
Published: July 2006

New poly- and bis(thiacrown ether)s containing two oxygen atoms and three to four sulfur atoms in the polyether-polysulfide ring have been synthesized, and they were found to bind silver picrate effectively compared with their monocyclic analogs.
ESR MEASUREMENTS OF INTERACTION BETWEEN Mn2+ AND PROTEINS. A NEW METHOD FOR ANALYSIS OF EXPOSED CHARGED RESIDUES
Authors: Nishihara Shoko , Watanabe Tokuko , Arata Yoji
Published: July 2006

A new method, which is based on the use of Mn2+ ion as an ESR probe, has been developed to examine the number of charged residues on the surface of protein. Results obtained using this method will be briefly discussed for several kinds of proteins.
DEOXYOKAMURALLENE AND ISOOKAMURALLENE, NEW HALOGENATED NONTERPENOID C15-COMPOUNDS FROM THE RED ALGA LAURENCIA OKAMURAI YAMADA
Authors: Suzuki Minoru , Kurosawa Etsuro
Published: July 2006

Two new C15-bromoallenes, deoxyokamurallene and isookamurallene, have been isolated from the title alga, and their structures were determined on the basis of their spectroscopic evidence.
CARBOALUMINATION OF ALKYNES WITH DIALKYLCHLOROALANES IN THE PRESENCE OF ZIRCONOCENE DICHLORIDE. AN IMPROVED METHOD FOR CARBOALUMINATION OF ALKYNES
Authors: Yoshida Tadao
Published: July 2006

In the presence of zirconocene dichloride, treatment of alkynes with dialkylchloroalanes followed by iodination gave the corresponding alkenyl iodides in good yields.
HYDROGENATION OF CARBON MONOXIDE TO OLEFINS CATALYZED BY BIS(2,4-PENTADIONATE)COBALT-LITHIUM ALUMINUM HYDRIDE SYSTEM IN LIQUID PHASE
Authors: Mitsudo Take-aki , Komiya Yukiatsu , Watanabe Yoshihisa
Published: July 2006

Bis(2,4-pentadionate)cobalt-lithium aluminum hydride system in tetrahydrofuran-tetralin is active for a catalytic hydrogenation of carbon monoxide to lower linear hydrocarbons, the distribution of which has a maximum at less than C6 with 85% of selectivity for olefins.
ELECTROCHEMICAL REFERENCE ELECTRODE FOR THE ION-SELECTIVE FIELD EFFECT TRANSISTOR
Authors: Tahara Shu , Yoshii Mitsuyoshi , Oka Syotaro
Published: July 2006

By means of the monolithic integrated circuit techniques with the plasma polymerization method, a reference field effect transistor (REFET) has been developed to be used with the ion-selective field effect transistors (ISFET’s). The gate insulator of the REFET is coated with a plasma polymerized styrene film. It was used in combination with the pH-ISFET to determine pH values. Experimental results compared favorably with those from the convetional glass electrode method.
ANALYSIS OF RADICAL OLIGOMERIZATION OF STYRENE BY FIELD DESORPTION MASS SPECTROMETRY
Authors: Saito Jun , Hara Junji , Toda Shozo , Tanaka Shigeyuki
Published: July 2006

The mechanism of thermally initiated polymerization of styrene has been investigated by field desorption mass spectrometry. Most of molecular ion peaks of styrene oligomers have been assigned to a few repetitive units of styrene with additive groups. As a result, it is concluded that the cleavage of styrene dimers to phenylpropenyl and benzyl radicals should contribute to the chain transfer and the reinitiation mechanisms of styrene polymerization.
γ-CYCLODEXTRIN-ENHANCED EXCIMER FLUORESCENCE OF PYRENE AND EFFECT OF n-BUTYL ALCOHOL
Authors: Kano Koji , Takenoshita Itsuro , Ogawa Teiichiro
Published: July 2006

The fluorescence of pyrene has been measured in aqueous solutions in the presence of γ-cyclodextrin. The excimer emission of pyrene was enhanced upon addition of γ-cyclodextrin, indicating the formation of the 2:1 complex of pyrene with γ-cyclodextrin which degraded upon addition of n-butyl alcohol to yield the more stable three-component complex of pyrene, n-butyl alcohol, and γ-cyclodextrin.
MONORADICAL REARRANGEMENT OF 1,4-BIRADICALS INVOLVED IN NORRISH TYPE II PHOTOREACTION OF METHANONAPHTHOQUINONES
Authors: Osuka Atsuhiro , Shimizu Hirohito , Suzuki Hitomi , Maruyama Kazuhiro
Published: July 2006

Type II photoreaction of the title compound gave a cyolobutanol by cyclization, an unsaturated keto alcohol by reverse disproportionation, and a bicyclic diketone by cyclopropylcarbinyl rearrangement. Relative rates of the type II biradical reactions were estimated on the basis of the product analysis.
DIANION OF 2-(METHYLTHIO)-4-PENTENOIC ACID: A USEFUL REAGENT FOR THE PREPARATION OF 5-METHYLENE-2(5H)-FURANONES
Authors: Tanaka Kazuhiko , Terauchi Makoto , Kaji Aritsune
Published: July 2006

A general and mild approach to 5-methylene-2(5H)-furanones has been demonstrated, which involves (a) the alkylation of dianion of 2-(methylthio)-4-pentenoic acid, (b) the cyclization followed by dehydrosulfenylation, and (c) the facile dehydroiodination by Na2CO3.
STANNOUS TRIFLATE: A NEW ALDOL REACTION VIA DIVALENT TIN ENOLATES
Authors: Mukaiyama Teruaki , Stevens Rodney W , Iwasawa Nobuharu
Published: July 2006

Divalent tin enolates formed from stannous triflate and ketones react with carbonyl compounds under mild conditions to give the corresponding aldol products in good yields. In the case of cross-coupling with aldehydes, good to excellent erythro-selectivity was observed.
A ONE-STEP SYNTHESIS OF PURINE DERIVATIVES BY THE REACTION OF PHENYLAZOMALONAMIDAMIDINE WITH ARYL ALDEHYDES
Authors: Yoneda Fumio , Koga Ryosuke , Higuchi Masatsugu
Published: July 2006

Treatment of phenylazomalonamidamidine (I) with aryl aldehydes yielded the corresponding 2,8-diarylhypoxanthines (II) in a single step. The reaction under milder conditions formed the intermediary monoarylidene derivatives (III) of I, from which the corresponding 6-amino-2-aryl-5-phenylazopyrimidine-4(3H)-ones (IV) were obtained by the oxidative cyclization with diethyl azodicarboxylate. Treatment of IV with second aryl aldehydes gave the unsymmetrical 2,8-diarylated hypoxanthines.
CYCLOREVERSION OF CIS-1,2-DINAPHTHYLCYCLOBUTANE VIA EXCIPLEX WITH TRIETHYLAMINE. SOLVENT EFFECT ON THE MODE OF CYCLOREVERSION
Authors: Takamuku Setsuo , Kuroda Takayuki , Sakurai Hiroshi
Published: July 2006

t-3, t-4-Di (2-naphthyl)-r-1,c-2-dimethoxycarbonylcyclobutane (DDCB), when irradiated in the presence of triethylamine, undergoes cycloreversion via the exciplex and/or the ion-pair. The mode of cycloreversion changes with the solvent polarity, reflecting the electronic structure of the intermediates.
Ru(bpy)32+ SENSITIZED PHOTOOXIDATION REACTION OF cis-STILBENES NOVEL PRODUCTS FORMATION
Authors: Futamura Shigeru , Ohta Hiroyuki , Kamiya Yoshio
Published: July 2006

Ru(bpy)32+ sensitized photooxidation of cis-stilbenes in acetonitrile gave novel [2+6] cycloadducts. Product distribution changed remarkably depending on sensitizers.
CATALYST EFFECT ON THE SYNTHESIS OF ETHYL ACETATE VIA REDUCTIVE CARBONYLATION OF METHYL ACETATE
Authors: Kheradmand Houchang , Jenner Gérard , Kiennemann Alain , Deluzarche Antonin
Published: July 2006

The effect of several catalysts and binary catalyst mixtures is examined in the formation of ethyl acetate from methyl acetate in presence of CO–H2. The most effective catalytic system is a combination of ruthenium-cobalt compounds. The optimum conversion and selectivity to ethyl acetate is achieved with an atomic ratio Co/Ru = 0.4.
ON THE NATURE OF THE BONDING IN AND REACTIVITY OF SILICA GEL SUPPORTED PERMANGANATE
Authors: Jazzaa Abdulaziz Al , Clark James H , Robertson Malcolm
Published: July 2006

Infrared spectroscopic studies of silica gel supported permanganate reveal the presence of a discrete physisorbed salt monolayer which is thought to be responsible for the observed enhancement in permanganate reactivity.
PHOTOCATALYTIC OXYGEN EVOLUTION FROM TiO2 POWDER-WATER-HALATE SYSTEMS
Authors: Oosawa Yoshinao
Published: July 2006

Oxygen evolves easily on irradiation(>300 nm) from aqueous solutions of BrO3− and IO3− in the presence of TiO2 around room temperature. By the introduction of this process, the maximum temperature required for several thermochemical cycles for water decomposition is expected to decrease greatly.
OLEFINATION OF KETONES USING 1,1-DIMETALLOALKANES DERIVED FROM i-Bu2AlCH=CHR - Cl2TiCp2 SYSTEM
Authors: Yoshida Tadao
Published: July 2006

The alkylidenation of ketone carbonyls using 1,1-dimetalloalkanes prepared by the reaction of 1-alkenyldiisobutylalanes with titanocene dichloride afforded the corresponding olefins in good yields.
HETEROGENEOUS–HOMOGENEOUS MECHANISM FOR VAPOR-PHASE CATALYTIC OXIDATIVE DEHYDROGENATION OF ETHYLBENZENE BY CARBONYL SULFIDE
Authors: Akimoto Masamichi , Yamagami Koji , Echigoya Etsuro
Published: July 2006

A mechanistic study on vapor-phase oxidative dehydrogenation of ethylbenzene to styrene by COS over SiO2,Al2O3,MgO,and TiO2 catalysts has been carried out. The results obtained indicate that the sulfur evolved by the heterogeneous catalytic decomposition of COS dehydrogenated ethylbenzene in the homogeneous phase.
ROLE OF TRANSITION METAL ELEMENTS IN Te–Mo–M–O CATALYSTS AS REVEALED BY THE OXIDATION OF PROPYLENE TO ACROLEIN WITH 18O2 TRACER
Authors: Ueda Wataru , Moro-oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Participation of the lattice oxide ions in various tellurium-based multicomponent oxide catalysts, Te–Mo–M–O (M = Co, Mn, Fe and Cu) was investigated using 18O2 tracer in the selective oxidation of propylene to acrolein. High mobility of the lattice oxide ions in this system plays an important role in stabilizing the active site for the redox process and in suppressing the vaporization of tellurium metal from the catalyst during the reaction.
PHOTORESPONSIVE CRYPTAND WITH AN AZOPYRIDINE-BRIDGE
Authors: Shinkai Seiji , Minami Takahide , Kouno Takeshi , Kusano Yumiko , Manabe Osamu
Published: July 2006

A new photoresponsive “cryptand” with an azopyridine-bridge (2) was synthesized. Trans-(2) was able to extract heavy metal ions (Cu2+, Ni2+, Co2+, and Hg2+) from aqueous solution to organic (o-dichlorobenzene +n-butyl alcohol) phase, whereas photoisomerized cis-(2) scarcely extracted heavy metal ions. The difference is rationalized in terms of the structural change of the azopyridine-bridge which is induced by photo(u.v.)-irradiation.
EXTRACTION OF GALLIUM(III) FROM ALKALINE SOLUTIONS BY ALKYLATED HYDROXYQUINOLINE
Authors: Sato Taichi , Nakamura Takato , Yabuta Mitsuo , Oishi Hiroyuki
Published: July 2006

The distribution equilibrium of gallium(III) between aqueous sodium hydroxide solutions and solutions of 7-(5,5,7,7-tetramethyl-1-octen-3-yl)-8-hydroxyquinoline (KELEX 100) in kerosene has been examined under different conditions. As a result, it is confirmed that the extraction of gallium(III) proceeds in a cation exchane reaction.
VERSATILE POLYMER-BOUND RHODIUM CATALYSTS. FACILE HYDROGENATION OF AROMATIC COMPOUNDS IN THE LIQUID PHASE
Authors: Okano Tamon , Tsukiyama Katsunori , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

Immobilized complexes prepared from [RhCl(nbd)]2 (nbd = norbornadiene) and phosphinated polydiacetylene or silica are efficient catalysts for the hydrogenation of arenes under mild conditions. However, the homologous catalyst supported on a phosphinated polystyrene is not active.
THE PALLADIUM(0)-CATALYZED REDUCTIVE COUPLING OF HALIDES USING sym-DICHLOROTETRAMETHYLDISILANE AS A REDUCING AGENT
Authors: Nakano Taichi , Takahashi Masatoshi , Ashizawa Toshiyuki , Arai Takeshi , Seki Shinji , Matsumoto Hideyuki , Nagai Yoichiro
Published: July 2006

The reaction of benzylidene chlorides as well as 1,2-dihalogeno-1,2-diphenylethanes with sym-dichlorotetramethyldisilane in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) gave aryl-substituted ethenes in good yields.
MEASUREMENT OF INFRARED SPECTRA OF SURFACE SPECIES FOR NO2–C3H6–ZnO SYSTEM UNDER PHOTOIRRADIATION
Authors: Ibusuki Takashi , Izawa Nobuyuki , Takeuchi Koji
Published: July 2006

A reaction cell for measurement of ir spectra of surface species on solid catalysts under photoirradiation is developed and is applied to NO2–C3H6–ZnO system. A remarkable change in ir spectra of NO2 adsorbed on ZnO with photoirradiation is satisfactorily observed and is briefly discussed.
RAMAN CIRCULAR INTENSITY DIFFERENTIAL SPECTRA OF METHYL ORANGE INDUCED BY INCLUSION IN CYCLODEXTRIN
Authors: Higuchi Seiichiro , Tanaka Kozo , Tanaka Shigeyuki
Published: July 2006

Raman circular intensity differential spectra were measured for the aqueous dilute solution of methyl orange and α-cyclodextrin, making use of the resonance Raman effect. The obtained spectra were discussed in terms of the vibrational optical activity induced by the inclusion of methyl orange in α-cyclodextrin.
THE STEREOSPECIFIC HYDROXYLATION OF ENDOCYCLIC ETHYLENIC LINKAGE IN THE BIOTRANSFORMATION OF α-TERPINYL ACETATE WITH CULTURED SUSPENSION CELLS OF NICOTIANA TABACUM
Authors: Hirata Toshifumi , Lee Ym Sook , Suga Takayuki
Published: July 2006

The biotransformation of (±)-8-acetoxy-p-menth-1-ene (α-terpinyl acetate) with the cultured cells of Nicotiana tabacum was found to result in the predominant formation of 8-acetoxy-c-4-p-menthane-r-1,t-2-diol. This experimental result indicates that the hydroxylation of the endocyclic ethylenic linkage with the cultured suspension cells is stereospecific.
A NOVEL METHOD FOR THE SYNTHESIS OF 2-DEOXYDISACCHARIDE BY STEREOSELECTIVE CYCLIZATION OF THE ACYCLIC PRECURSOR
Authors: Suzuki Keisuke , Mukaiyama Teruaki
Published: July 2006

Stereoselective cyclization of (Z)-(2R,3R,4R)-6-cyclohexyloxy-1,3,4-tribenzyloxy-5-hexen-2-ol (1)promoted by Hg(OCOCF3)2, followed by reductive work up gave the 2-deoxy-α-hexopyranoside derivative almost exclusively. On the other hand, a predominant formation of the β-anomer was achieved by the treatment of 1 with PhSeCl, and the successive deselenation.
REDUCTION OF CONJUGATED DIENOIC CARBOXYLIC ACIDS AND ESTERS WITH SODIUM DITHIONITE
Authors: Camps Francisco , Coll José , Guerrero Angel , Guitart Josefa , Riba Magi
Published: July 2006

Reduction of 2,4-alkadienoic acids and esters with sodium dithionite was carried out in aqueous solution or under PTC conditions to give, almost exclusively, Z:E isomeric mixtures of the corresponding 3-alkenoic acids and esters, respectively, in good yields.
ORGANIC METALS: ELECTROCRYSTALLIZATION OF THE COMPLEXES OF NAPHTHACENO[5,6-cd:11,12-c′d′]BIS[1,2]DITHIOLE AND THEIR ELECTRICAL CONDUCTIVITIES
Authors: Tanaka Hidekazu , Nogami Takashi , Mikawa Hiroshi
Published: July 2006

The complexes of naphthaceno[5,6-cd:11,12-c′d′]bis[1,2]dithiole with inorganic anions (Cl−, Br−, I−, Clo4−, BF4−, PF6−, and SbF6−) were obtained as crystals by an electrochemical technique. The temperature dependences of their electrical conductivities were measured. The PF6 complexes showed 762 (Ω cm)−1 at room temperature, and it was metallic above 220 K.
A NEW METHOD ON THE DETERMINATION OF HEAT CHANGE IN SOLVENT EXTRACTION OF METALS. THE EXTRACTION OF ZINC(II) FROM HYDROCHLORIC ACID SOLUTIONS BY TRIOCTYLMETHYLAMMONIUM CHLORIDE
Authors: Sato Taichi , Nakamura Takato , Kuwahara Masami
Published: July 2006

To measure directly the heat change associated with the extraction of zinc(II) from hydrochloric acid solutions by trioctylmethylammonium chloride (TOMAC) in benzene has been succeeded by using twin type isoperibol calorimeter. It is proved that the heat change depends on the concentration of acid in aqueous phase.
THE EFFECTS OF SIZE AND DONOR ATOMS OF MACROCYCLIC POLYAMINES BINDING TO Mg2+ AND Ca2+
Authors: Fujioka Haruto , Kimura Eiichi , Kodama Mutsuo
Published: July 2006

New macrocyclic polyamines L2–L5 have been synthesized to develop sequestering agents selective for Na+, K+, Mg2+ and Ca2+ ions in aqueous solutions. 18-membered hexadentate ligands L2 and L3 show specificity toward Ca2+, whereas a 16-membered pentaamine with an amine branch (L4) bind only to Mg2+.
PHOTODIMERISATIONSPRODUKTE VON STYRYL-α-PYRONEN DES YANGONIN-TYPS
Authors: Achenbach Hans , Schaller Egmont , Regel Walter
Published: July 2006

The photoinduced dimerization of the crystalline yangonin-type pyrones Ia and Ib was studied using 2H-labelled compounds. 1H-nmr of the dimerization products revealed their structures to be IIa and lIb respectively.
FORMATION OF ETA ALUMINA BY ANODIC OXIDATION OF ALUMINUM
Authors: Yamada Midori , Mita Ikuo
Published: July 2006

Anodic oxidation of aluminum was carried out in sodium carbonate alone, or in addition with sodium fluoride, sodium chloride, or sodium iodide at 303–353 K with a direct constant voltage of 150 V. Anodic oxidation proceeded with sparking for 120–300 s, and a white coatings of 5–9 μm thickness was formed. This coatings was identified as eta alumina of high crystallinity by X-ray analysis.
ELECTROPHILIC SUBSTITUTION OF N-METHYLOCTAETHYLPORPHYRIN
Authors: Toi Hiroo , Kitamura Satoru , Aoyama Yasuhiro , Ogoshi Hisanobu
Published: July 2006

Nitration of N-methyloctaethylporphyrin (1) takes place at the meso positions adjacent to the N-alkylated pyrrole ring (so-called α- or δ-position). Deuteration with CF3COOD-D2SO4 suggests preferential electrophilic substitution at α- or δ-position on the basis of 1H-nmr investigation.
ESTIMATION OF THE STEREOSELECTIVITY OF SOME REACTIONS ON ALKYL 1-PHENYLETHYL SULFIDES AND KETONES BY MOLECULAR FORCE FIELD CALCULATIONS
Authors: Hirota Minoru , Abe Kazuhisa , Tashiro Hiroshi , Nishio Motohiro
Published: July 2006

The stereoisomeric(threo/erythro) ratios of the reaction products were estimated from the conformational ratios of the reactant calculated by molecular force field approach. Examples of the oxidation to sulfoxides of alkyl 1-phenylethyl sulfides and the hydride reduction of alkyl 1-phenylethyl ketones were given.
UNSATURATED CROWN ETHERS: STILBENO-CROWN ETHERS
Authors: Inoue Yoshihisa , Ouchi Mikio , Nakazato Toshiyo , Matsuda Takashi , Hakushi Tadao
Published: July 2006

Stilbenocrown ethers 3a,c and 4a,b were synthesized in a cyclization reaction of benzoin with oligoethylene glycol ditosylates(2a-c) under a phase-transfer condition. Extractions of aqueous alkali picrates(Na+–Cs+) were examined with the distilbenocrown ethers 4a,b, the partially-hydrogenated tetraphenylcrown ethers 6a,b and the fully-hydrogenated tetracyclohexylcrown ethers 7a,b.
STUDIES ON THE CHEMICAL EFFECTS OF THE 6Li(n,α)T REACTION IN TRIS(OXALATO)FERRATE(III) CRYSTALS
Authors: Akashi Junko , Katada Motomi , Sano Hirotoshi
Published: July 2006

Chemical effects of the neutron irradiation of Li3[Fe(C2O4)3]·4.5H2O and (NH4)3[Fe(C2O4)3]·3H2O were studied by means of Mössbauer spectroscopy. No significant change was found in the neutron-irradiated (NH4)3[Fe(C2O4)3]·3H2O, while Fe(II) species were observed to be produced by the 6Li(n,α)T reaction in the neutron-irradiated Li3[Fe(C2O4)3]·4.5H2O.
STUDIES ON THE PHASE TRANSITION NEAR THE MELTING POINTS IN ACETYL AND CARBOXYL FERROCENES
Authors: Sato Kumiko , Konno Michiko , Sano Hirotoshi
Published: July 2006

Phase transitions were found in the entitled compounds near the melting points by means of Mössbauer spectroscopic study. In order to investigate the phase transition, the crystal structure of mcnoacetylferrocene was determined by X-ray diffraction at room temperature and oscillation and Weissenberg photographs were taken at high temperatures. The phase transition was also confirmed by differential thermal analysis.
PEPTIDE SYNTHESIS BY USING N-ACYLPHOSPHORAMIDITES
Authors: Kawanobe Wataru , Yamaguchi Kazuo , Nakahama Seiichi , Yamazaki Noboru
Published: July 2006

New trivalent phosphorus compounds, N-acetyl-N-methylphosphoramidites were prepared readily in good yield by the reaction of phosphorous chlorides and N-methylacetamide. By using the phosphoramidites as condensing agents, Young’s peptide and prolyl-leucyl-glycinamede(MSH-RIF) were synthesized without racemization in high yields under mild conditions.
REGIOSELECTIVE OXIDATION OF INTERNAL OLEFINS BEARING NEIGHBORING OXYGEN FUNCTIONS BY MEANS OF PALLADIUM CATALYSTS. A DIRECT PREPARATION OF γ-KETO ESTERS AND 1,4-DIKETONES FROM β,γ-UNSATURATED ESTERS AND KETONES
Authors: Nagashima Hideo , Sakai Kiyomi , Tsuji Jiro
Published: July 2006

γ-Keto esters and 1,4-diketones were prepared by the palladium-catalyzed regioselective oxidation of β,γ-unsaturated esters and ketones. The best yields were obtained when the reaction was carried out using PdCl2/CuCl/O2 catalyst system in aqueous dioxane.
SYNTHESIS AND PROPERTIES OF 5-(1,3-DITHIOL-2-YLIDENE)-2(5H)-THIOPHENONE
Authors: Takahashi Kazuko , Nishijima Kazumi , Takase Kahei , Shimozawa Takashi
Published: July 2006

The title compound and its phenyl derivatives have been prepared by the advantageous route which we have developed. These cross-conjugated compounds are suggested to have a preferable contribution of the quinonoid resonance structure at the ground state, but are slightly more polar than the iso-π-electronic 5-cycloheptatrienylidene-2(5H)-thiophenone, revealing that the dithiolidene residue is more electron-donating than the cycloheptatrienylidene one.
FERN CONSTITUENTS: NEW CYCLOARTANE TRITERPENOIDS, (24R)-CYCLOLAUDENYL ACETATE AND (24R)-CYCLOMARGENYL ACETATE, AND THEIR CORRESPONDING ALCOHOLS AND KETONES, ISOLATED FROM POLYPODIUM FORMOSANUM
Authors: Ageta Hiroyuki , Arai Yoko
Published: July 2006

New tetracyclic triterpenoids, (24R)-cyclolaudenyl acetate(Ia) and (24R)-cyclomargenyl acetate(Ib), and their corresponding alcohols(IIa, IIb) and ketones(IIIa,IIIb) were isolated from the rhizomes of Polypodium formosanum. The structure of Ia and Ib were deduced by chemical and spectroscopic methods to be (24R)-24-methylcycloart-25-en-3β-yl acetate and (24R)-24-ethylcycloart-25-en-3β-yl acetate, respectively.
STERIC ASPECTS OF THE OXIDATION OF THIOKETONES BY SINGLET OXYGEN
Authors: Ramnath Narayan , Rao Vaidhya Jayathertha , Ramesh Varadaraj , Ramamurthy Vaidhyanathan
Published: July 2006

Singlet oxygen oxidation of dialkyl thioketones yields the corresponding ketones and in some cases sulfoxides in varying amounts. Steric considerations on the reactive zwitterionic/diradical intermediates have been invoked to rationalise the product distribution.
SENSITIZED PHOTOLYSIS OF BENZOYL AZIDE. A NITRENE SINGLET-TRIPLET EQUILIBRIUM
Authors: Inagaki Masao , Shingaki Tadao , Nagai Toshikazu
Published: July 2006

The acetophenone-sensitized photolyses of benzoyl azide in cis-and trans-1,4-dimethylcyclohexanes gave the N-substituted benzamides stereospecifically. The photolyses in 2,3-dimethylbutane showed the same insertion regioselectivity ratio toward the C–H bonds as that of singlet benzoylnitrene in the direct photolysis. These facts indicate the existence of the singlet nitrene despite the triplet photosensitization and provide a chemical evidence for the establishment of a singlet-triplet equilibrium for benzoylnitrene.
ENANTIOSELECTIVE SYNTHESES OF (−)-SEMBURIN AND (−)-ISOSEMBURIN
Authors: Takano Seiichi , Tamura Nobuhiko , Ogasawara Kunio , Nakagawa Yoshiko , Sakai Tsutomu
Published: July 2006

Validity of the proposed structures of (−)-semburin(1) and (−)-isosemburin(2), isolated from Swertia japonica Makino, has been established by the enantioselective total syntheses starting from the known chiral lactone(3).
STUDIES ON MOLYBDO-OXIDASE MODELS: ROLE OF HEMIN OR FLAVIN FOR AIR OXIDATION OF PPh3 BY Mo(VI) COMPLEXES OF CYSTEINE-CONTAINING PEPTIDES
Authors: Ueyama Norikazu , Kamada Etsuo , Nakamura Akira
Published: July 2006

Air oxidation of triphenylphosphine catalyzed by MoO2(cys-OMe)2, MoO2(cys-OEt)2, MoO2(cys-Met-OMe)2 was studied as models of molybdo-oxidase. Addition of hemin or riboflavin to the systems facilitates the catalytic activity. Redox cycle between Mo(VI) and Mo(V) proceeds smoothly with addition of the electron-transfer mediators which rapidly oxidize Mo(V) to Mo(VI).
PRESSURE–VOLUME–TEMPERATURE RELATIONSHIPS OF LIQUID DICHLOROMETHANE AND TRICHLOROMETHANE
Authors: Kumagai Akibumi , Takahashi Shinji
Published: July 2006

The specific volumes of liquid dichloromethane and trichloromethane were measured at constant temperature by the variable volume method using a glass piezometer in the temperature range from 273 to 348 K and in the pressure range up to 100 MPa. The specific volume vs. pressure isotherms are expressed by the Tait equation within an accuracy of 0.07%.
THERMAL ANALYSIS OF HOFMANN’S PYRROLE, THIOPHENE, BENZENE, PHENOL, AND ANILINE CLATHRATES Ni(NH3)2Ni(CN)4·2G BY DIFFERENTIAL SCANNING CALORIMETRY
Authors: Uemasu Isamu , Iwamoto Toschitake
Published: July 2006

Hofmann’s clathrates Ni(NH3)2Ni(CN)4·2G (G = C4H5N, C4H4S, C6H6, C6H5OH, or C6H5NH2) were analyzed by differential scanning calorimetry. The analytical conditions were examined and the enthalpy changes accompanied with the liberation of guest molecules were determined for these clathrates except the aniline one.
INFRARED SPECTRA OF C-FLUOROPHOSPHAETHYNE FC≡P AND C-DIFLUOROPHOSPHAETHENE CF2=PH
Authors: Ohno Keiichi , Matsuura Hiroatsu , Kroto Harold W , Murata Hiromu
Published: July 2006

The infrared spectra of gaseous CF3PH2 treated with KOH have been measured in the 2500–400 cm−1 region by a Fourier transform spectrometer. Most of the bands newly observed on the KOH treatment have been assigned to the vibrations of unstable species, C-fluorophosphaethyne FC≡P and C-difluorophosphaethene CF2=PH.
THE CATALYTIC STEAM GASIFICATION OF COAL USING SODIUM HYDRIDOTETRACARBONYLFERRATE
Authors: Suzuki Toshimitsu , Mishima Masaru , Kitaguchi Junji , Watanabe Yoshihisa
Published: July 2006

The catalytic steam gasification of Miike coal using hydridotetracarbonylferrates was investigated. Sodium hydridotetracarbonylferrate was found to be a much more effective catalyst than well known sodium carbonate catalyst especially at lower temperature (650∼700°C).
OXIDATIVE REMOVAL OF N-(p-METHOXYBENZYL) GROUP ON DIKETOPIPERAZINE SKELETON WITH CERIC AMMONIUM NITRATE
Authors: Yoshimura Juji , Yamaura Masanori , Suzuki Tsuneji , Hashimoto Hironobu
Published: July 2006

N-(p-Methoxybenzyl) groups in some diketopiperazine derivatives were proved to be readily and efficiently removed with ceric ammonium nitrate in acetonitrile-water under mild conditions, where N-benzyl , methoxyl in the aminal structure, and isolated vinyl groups remained unchanged.
ELECTROCHEMICAL ASYMMETRIC REDUCTION OF PROCHIRAL CARBONYL COMPOUNDS, OXIMES, AND A gem-DIHALIDE ON A POLY-l-VALINE-COATED GRAPHITE ELECTRODE
Authors: Abe Shigemitsu , Fuchigami Toshio , Nonaka Tsutomu
Published: July 2006

The electrochemical asymmetric reduction of prochiral carbonyl compounds, oximes, and a gem-dihalide was examined by using a poly-l-valine-coated graphite electrode. The highest asymmetric yield (16.6%) was obtained in the reduction of 1,1-dibromo-2,2-diphenylcyclopropane to the corresponding monobromocyclopropane.
(−)-HERBERTENEDIOL AND (−)-HERBERTENOLIDE, TWO NEW SESQUITERPENOIDS OF THE ENT-HERBERTANE CLASS FROM THE LIVERWORT HERBERTA ADUNCA
Authors: Matsuo Akihiko , Yuki Shunji , Nakayama Mitsuru
Published: July 2006

The structures of (−)-herbertenediol and (−)-herbertenolide, the new aromatic sesquiterpenoids with the ent-herbertane skeleton isolated from the liverwort Herberta adunca, have been determined on the basis of the chemical and spectral evidence.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON THE PHOTOINDUCED SUBSTITUTION REACTION OF 4-METHYLQUINOLINE-2-CARBONITRILE IN CYCLOHEXANE
Authors: Hata Norisuke , Nishida Naoya
Published: July 2006

The photoinduced substitution reaction of 4-methylquinoline-2-carbonitrile in cyclohexane was found to show an external magnetic field effect due to HFI and Δg mechanism. It was revealed that (i) the photoreaction occurs from the S1 state as well as T1 states and (ii) the triplet radical pair intermediate 2b is responsible for the observed magnetic field effect, whereas the singlet radical pair intermediate 2a is insensitive to an external magnetic field.
POLYMER-PROTECTED COPPER COLLOIDS AS CATALYSTS FOR SELECTIVE HYDRATION OF ACRYLONITRILE
Authors: Hirai Hidefumi , Wakabayashi Hidehiko , Komiyama Makoto
Published: July 2006

Stable colloidal dispersion of copper in water is prepared by the reduction of copper sulfate with sodium tetrahydroborate in the presence of poly(vinylpyrrolidone), poly(vinyl alcohol), dextrin, or poly(methyl vinyl ether). The poly(vinylpyrrolidone)-protected copper colloids are effective for the selective catalysis in hydration of acrylonitrile to acrylamide at 80°C in water.
THE EFFECTS OF THE NEIGHBORING METHOXYCARBONYL GROUP AND SULFUR ATOM(S) IN THE CARBON–SULFUR BOND CLEAVAGE AND THE ESTER EXCHANGE IN FLUORENE SYSTEMS
Authors: Nakanishi Waro , Nakanishi Hitoshi , Yanagawa Yuko , Ikeda Yoshitsugu , Oki Michinori
Published: July 2006

9,9-Bis(ethylthio)fluorene (1a) reacted with sodium ethanethiolate in methanol to give 9-ethylthiofluorene and diethyl disulfide suggesting that a C–S bond cleavage occurs by attack of a nucleophile at sulfur if a leaving group is sufficiently stable. The pseudo-first-order rate constans for the reaction of 1a and methoxycarbonyl-substituted 9-ethylthiofluorenes have suggested that the methoxycarbonyl group at 1-position exerts through space interaction with sulfur atom(s). The rate constants for ester exchange in 1-methoxycarbonylfluorene and its derivatives have been discussed on the ground of neighboring sulfur participation.
THE OXYGENATION OF α-ISOPHORONE AND ITS SILYL ENOL ETHER WITH t-BuOOH IN THE PRESENCE OF METAL CATALYSTS
Authors: Hosokawa Takahiro , Inui Shiro , Murahashi Shun-Ichi
Published: July 2006

Treatment of α-isophorone (1) with t-BuOOH in the presence of palladium(II) or copper(I) catalyst gives ketoisophorone (2) selectively. A similar treatment of silyl enol ether 7 derived from 1 affords 6-hydroxylisophorone 8.
A TOTAL SYNTHESIS OF 6″-EPIVALIDAMYCIN A AND ITS DIASTEREOMER
Authors: Ogawa Seiichiro , Inoue Makoto , Iwasawa Yoshikazu , Toyokuni Tatsushi , Suami Tetsuo
Published: July 2006

A total synthesis of the 6″-epimer of validamycin A and its diastereomer has been accomplished by a coupling reaction of the racemic peracyl 5,6-dihydroxy-1-hydroxymethyl-1,3-cyclohexadiene monoepoxide, the precursor of the unsaturated branched-chain cyclitol portion, with the protected β-d-glucopyranosylvalidamine, followed by acid hydrolysis and O-deacylation.
T1 ← S0 EXCITATION SPECTRUM OF 1,4-DICHLORONAPHTHALENE
Authors: Iwasaki Noriko , Nishi Nobuyuki , Kinoshita Minoru
Published: July 2006

A well-resolved T1 ← S0 excitation spectrum of 1,4-dichloronaphthalene has been obtained at 4.2 K. The frequency of one of the out-of-plane vibrations is found to be markedly reduced in the triplet state. This is discussed in terms of vibronic coupling in the triplet manifold.
NOVEL PHOTOREDUCTIVE ALKYLATION OF METHYL 4-PHENYLBENZOATE WITH ALIPHATIC TERTIARY AMINES
Authors: Tsujimoto Kazuo , Inaba Yoshihiro , Ohashi Mamoru
Published: July 2006

A photoinduced electron-transfer reaction of methyl 4-phenylbenzoate with triethylamine leads to an aminoketone (4), and a photoreductive ethylation product (2) which results from the Norrish Type II reaction of the aminoketone.
INFRARED STUDY OF AMMONIA AND PYRIDINE ADSORPTION ON V–Ti OXIDE
Authors: Miyata Hisashi , Nakagawa Yoshiro , Ono Takehiko , Kubokawa Yutaka
Published: July 2006

Adsorption of ammonia and pyridine on V–Ti oxide with a low vanadium content (2 and 5 wt%) has been studied by IR techniques. V–Ti oxide shows both Brønsted and Lewis acidities. The nature of both acid sites and the difference between the acidities determined from ammonia and pyridine adsorption have been discussed.
IMPROVEMENT OF SELECTIVITY FOR C2-OXYGENATED COMPOUNDS IN CO–H2 REACTION OVER TiO2-SUPPORTED Rh CATALYSTS BY DOPING ALKALI METAL CATIONS
Authors: Orita Hideo , Naito Shuichi , Tamaru Kenzi
Published: July 2006

The addition of alkali metal cations to TiO2-supported Rh catalysts improved the selectivity for C2-oxygenated compounds in CO–H2 reaction under atmospheric pressure. The dependences of the reaction rates on pretreatment conditions and reaction temperatures were also examined, which suggest that the active sites or the reaction path for the formation of acetaldehyde may be different from those for ethanol as well as hydrocarbons.
PREPARATION AND CHARACTERIZATION OF SOME RARE-EARTH COMPLEXES OF THE PHTHALOCYANINE RADICAL
Authors: Sugimoto Hiroshi , Higashi Teruaki , Mori Masayasu
Published: July 2006

The reaction of tris(2,2,6,6-tetramethyl-3,5-heptanedionato) complexes of rare-earth elements, M3+(dpm)3 (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) with lithium phthalocyanine Li2(Pc2−) in tetrahydrofuran gave new stable phthalocyanine radical complexes [M3+(Pc−·)(dpm)2].
19-METHYL vs. 18-METHYL GROUP MIGRATION IN THE REARRANGEMENT OF 3β-ACETOXY-9α,11α-EPOXY-5α-LANOSTAN-7-ONE
Authors: Paryzek Zdzislaw , Wydra Roman , Blaszczyk Krzysztof
Published: July 2006

BF3·Et2O-catalyzed rearrangement of the keto-epoxide (1b) was found to be a complex reaction leading to compounds (2), (4), and (5) having the rearranged carbon skeletons; spectral and chemical evidences are presented to confirm their structures.
A NOVEL PROCEDURE FOR THE PREPARATION OF 1-OH SUGAR DERIVATIVES USING 2-METHOXYETHYL GLYCOSIDES
Authors: Morishima Naohiko , Koto Shinkiti , Kanemitsu Kumi , Zen Shonosuke
Published: July 2006

Treatment of benzyl-protected 2-methoxyethyl glycopyranosides with titanium tetrachloride followed by hydrolysis provides a new method for the preparation of the corresponding 1-OH sugar derivatives. The present method is shown to be useful for the preparation of mono-O-acetyl- and mono-O-allyl-tri-O-benzyl-d-glucopyranoses.
FORMAL SYNTHESIS OF (±)-IPALBIDINE
Authors: Iida Hideo , Watanabe Yohya , Kibayashi Chihiro
Published: July 2006

1-Aza-3-(4-methoxyphenyl)bicyclo[4,3,0]nonan-4-one, key intermediate to (±)-ipalbidine, was conveniently synthesized by intramolecular cyclization of the N-formyIketone which was obtained via [3 + 2] cycloaddition reaction of the cyclic nitrone.
REACTIONS OF SILYLENES WITH 1,4-DIPHENYL-1,3-BUTADIENE AND 1-METHYL-1,2,3,4,5-PENTAPHENYLSILOLE. A NOVEL SILYLENE-SILYLENE EXCHANGE REACTION
Authors: Sakurai Hideki , Kobayashi Yoshiteru , Sato Ryuji , Nakadaira Yasuhiro
Published: July 2006

Thermally generated dimethylsilylene reacts with 1,4-diphenyl-1,3-butadiene to give 1,1-dimethyl-4,5-diphenyl-1-silacyclo-2-pentene. A mechanism involving homolytic C–C bond cleavage of the intermediate vinylsilacyclopropane is suggested. Dimethylsilylene also undergoes a novel silylene–silylene exchange reaction with 1-methyl-1,2,3,4,5-pentaphenylsilole.
EFFECTIVE ASYMMETRIC HYDROGENATION OF DEHYDRODIPEPTIDES WITH RHODIUM(I)-NEW CHIRAL DIPHOSPHINITE SYSTEMS
Authors: Yatagai Masanobu , Zama Masanobu , Yamagishi Takamichi , Hida Mitsuhiko
Published: July 2006

Rh(I)-new chiral diphosphinite systems with terminal amino groups were very effective for asymmetric hydrogenation of dehydrodipeptides with free carboxyl group and a chiral carbon. The effectiveness of the diphosphinite catalysts strongly suggests the contribution of electrostatic effect to asymmetric induction.
A CHELATE RING SIZE EFFECT ON SPIN STATES OF IRON(III) COMPLEXES WITH HEXADENTATE LIGANDS DERIVED FROM SALICYLALDEHYDE AND 4,8-DIAZAUNDECANE-1,11-DIAMINE(3,3,3-tet) OR 4,7-DIAZADECANE-1,10-DIAMINE(3,2,3-tet), AND THEIR X-RAY STRUCTURES
Authors: Ito Tasuku , Sugimoto Masako , Ito Haruko , Toriumi Koshiro , Nakayama Hiroaki , Mori Wasuke , Sekizaki Masao
Published: July 2006

High- and low-spin Fe(III) complexes with the titled ligands, [Fe(Sal23,3,3-tet)](NO3) (S=5/2) (1) and [Fe(Sal23,2,3-tet)](NO3) (S=1/2) (2), have been synthesized. X-ray analyses for 1 and 2 show that, in each complex, the metal environment is pseudo octahedral with the two O atoms being trans. Difference of one CH2 group in the methylene chain of the ligand causes a copmlete change in the spin state without changing coordination gemetries. In methanol, 2 is essentially low spin with μeff=1.95 BM(263.5 K), whereas 1 exhibits the behavior for the spin equilibrium [μeff=3.00(244.5 K)–4.04(305.5 K) BM]. The equilibrium constant of 1, K = [low-spin]/[high-spin]=2.6±0.9 at 25 °C and ΔH = −11.8±2.5 kJ mol−1 were obtained from detailed analyses of the temerature dependent electronic spectra.
MÖSSSBAUER SPECTROSCOPIC AND ELECTROCHEMICAL STUDIES ON 1′,1'″-DIHALOBIFERROCENES
Authors: Motoyama Izumi , Suto Kyoko , Katada Motomi , Sano Hirotoshi
Published: July 2006

In the Mössbauer spectroscopic studies on the triiodide salts of a series of 1′,1'″-dihalobiferrocenes, it has been found that the monocations of diiodo- and dibromobiferrocene show averaged valence states of iron atoms, while the monocation salt of dichlorobiferrocene shows a trapped valence state of iron atoms. On the other hand, no difference has been found in the half-wave potentials of the halobiferrocenes.
ASYMMETRIC HYDROGENATIONS OF N-PYRUVOYL-(S)-AMINO ACID ESTERS BY USING SODIUM BOROHYDRIDE. A SOLVENT EFFECT
Authors: Munegumi Toratane , Harada Kaoru
Published: July 2006

N-Pyruvoyl-(S)-amino acid isobutyl esters were hydrogenated with sodium borohydride(NBH) in several alcoholic solvents, and N-[(R)-lactoyl]-(S)-amino acid esters were obtained with diastereoisomeric purity of up to 44%. Significant solvent effect on the diastereoisomeric purity of the product was observed.
HEXACARBONYLMOLYBDENUM-INDUCED FORMATION OF PYRIDINES FROM ISOXAZOLES AND ACETYLENIC ESTER
Authors: Kobayashi Tomoshige , Nitta Makoto
Published: July 2006

Upon treatment with Mo(CO)6 in anhydrous benzene, substituted isoxazoles undergo a novel inclusion of dimethyl acetylenedicarboxylate across the C4–C5 bond and loss of an oxygen atom to lead to pyridines.
PHOTOCYCLOADDITION OF 4-METHOXYQUINOLIN-2(1H)-ONE AND RELATED COMPOUNDS TO ALLENE: SYNTHESIS OF 1-METHYLENE-1,2-DIHYDROCYCLOBUTA[c]QUINOLIN-3(4H)-ONE AND RELATED COMPOUNDS
Authors: Kaneko Chikara , Shimomura Naoyuki , Momose Yu , Naito Toshihiko
Published: July 2006

Photocycloaddition of 4-methoxy-2-pyridones and -quinolones to allene gives the head-to-tail adduct as the predominant product, which by base treatment affords the title compounds.