bluuebunny/crossref_metadata_2025 huggingface dataset:
OXIDATIVE SYNTHESIS, OPTICAL RESOLUTION, AND CHARACTERIZATION OF MIXED SULFENATO AND SULFINATO COBALT(III) COMPLEXES
Authors: Kita Masakazu , Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

Five new complexes fac(S)-[Co{S(O)CH2CH2NH2}n{S(O)2CH2CH2NH2}3−n] (n = 3, 2, 1, and 0) prepared via H2O2 oxidation of fac(S)-[Co(SCH2CH2NH2)3] have been isolated and optically resolved by means of column chromatography or preferential precipitation of a diastereomeric molecular compound with d-tartaric acid.
SYNCHRONOUS ELIMINATION OF THE NITRO AND ESTER GROUPS OR THE NITRO AND KETO GROUPS VIA ONE ELECTRON TRANSFER REACTION
Authors: Tamura Rui , Nakatsuka Tamon , Ono Noboru , Kaji Aritsune
Published: July 2006

The nitro and ester groups are eliminated from α-cyano-β-nitroesters(1)on treatment with one electron transfer reagents. Similarly, the nitro and acetyl groups are eliminated from α-acetyl-β-nitroesters(2)or α-acetyl-β-nitroketones(3).
A NEW SYNTHETIC METHOD FOR PELLITORINE
Authors: Mandai Tadakatsu , Gotoh Jiso , Otera Junzo , Kawada Mikio
Published: July 2006

A stereoselective synthesis of N-isobutyl-E,E-2,4-decadienamide, so called pellitorine is described in which the elimination reaction of acetic acid from 2-acetoxy-E-3-decenenitrile providing 2,4-decadienenitrile in a high yield was used as a key reaction.
cis- AND trans-DICHLOROBIS(BENZONITRILE)PLATINUM(II): PREPARATION AND ISOMERIZATION STUDIES BY 13C NMR SPECTROSCOPY
Authors: Uchiyama Toshihiko , Nakamura Yukio , Miwa Toshio , Kawaguchi Shinichi , Okeya Seichi
Published: July 2006

Although dichlorobis(benzonitrile)platinum(II) has been thought so far to exist solely as a cis isomer, the reaction of platinum(II) chloride with neat benzonitrile affords a mixture of cis and trans complexes in variable proportions depending on the temperature. The 13C NMR spectra of the trans isomer and 13CN-enriched cis isomer are reported together with the rate and equilibrium data for the cis\ightleftarrows trans isomerization in CDCl3.
PHOTO-INDUCED REACTION OF ALKYLATED 1,4-TOLUQUINONE CARRYING ESTER GROUP IN THE ALKYL SIDE CHAIN
Authors: Maruyama Kazuhiro , Kozuka Tadashi
Published: July 2006

Irradiation of several 1,4-toluquinones 1a–d having functionalized side chain rapidly gave bicyclic phenolic compounds 2a–d in good yields via intramolecular hydrogen abstraction-proton transfer-cyclization. In the case of 1f, however, it was found that intramolecular rearrangement occurred concomitantly.
STRUCTURAL EFFECT OF MIXED MICELLES IN THE DEACYLATION OF p-NITROPHENYL ESTERS BY SPECIFIC HYDROXAMIC ACIDS
Authors: Ueoka Ryuichi , Matsumoto Yoko
Published: July 2006

In the presence of cationic surfactants, the deacylation rate of p-nitrophenyl esters by 2-hexyldecanohydroxamic acid which possesses the branched alkyl chains was larger than those by decanohydroxamic acid or the hydroxamic acid of N-decanoylphenylalanine which has the straight alkyl chain.
ENANTIOFACE-DIFFERENTIATION IN FREE RADICAL ADDITION OF THIOLACETIC ACID TO (Z)-2-OCTENE IN THE PRESENCE OF CHIRAL SUBSTANCES
Authors: Yoshihara Masakuni , Fujihara Hisashi , Yoneda Akihiro , Maeshima Toshihisa
Published: July 2006

The free radical addition of thiolacetic acid to (Z)-2-octene in the presence of l-menthol or deoxycholic acid using 2,2′-azobisisobutyronitrile (AIBN) gave optically active 2-acetylthio-n-octane and 3-acetylthio-n-octane.
RADIATION-INDUCED REDUCTION OF AROMATIC CARBOXYLIC ESTERS IN ALCOHOLIC SOLUTIONS
Authors: Sugimori Akira , Yashima Toshihiro
Published: July 2006

Gamma-irradiation of aromatic carboxylic esters in alcoholic solutions brings about the reduction of the ester group to aldehyde, alcohol, α-ketoalcohol, and 1,2-glycol. The reduction is effected by solvated electrons and solvent-derived hydroxyalkyl radicals.
CRYSTAL STRUCTURE OF A β-CYCLODEXTRIN·ETHANOL·OCTAHYDRATE
Authors: Tokuoka Ryoji , Abe Masako , Fujiwara Takaji , Tomita Ken-ichi , Saenger Wolfram
Published: July 2006

Ring-shaped β-cyclodextrin(β-CD) molecules as hosts enclosing ethanol and three water molecules as guests are arranged in cage-type structure produced by the twofold screw axis of the monoclinic crystal system; space group P21, a=21.115, b=10.190, c= 15.214Å, β=111.4°, Z=2. Between the β-CD, five waters are located. Each of the guest ethanol, two waters and three primary hydroxyls are distributed at two alternative sites. The possibility of a structural transition from cage to channel type is considered.
ADDITION OF 5-MEMBERED AROMATIC HETEROCYCLIC COMPOUNDS TO ACETYLENES CATALYZED BY TETRARHODIUM DODECACARBONYL: SYNTHESES OF VINYL SUBSTITUTED AROMATIC HETEROCYCLIC COMPOUNDS
Authors: Hong Pangbu , Cho Bo-Re , Yamazaki Hiroshi
Published: July 2006

In the presence of a catalytic amount of Rh4(CO)12 furan adds to diphenylacetylene (1a) to give 1-(2-furyl)-1,2-diphenylethylene in a 80% yield. Similarly, from 2-substituted furans are obtained the adducts (3e–3h), in which the furyls attach to the olefin at the 5-position of the rings, in good yields. Thiophene and N-methylpyrrole also react with 1a to afford the corresponding ethylenes.
THE CRYSTAL STRUCTURE OF LEAD(II) IODIDE-DIMETHYLSULPHOXIDE(1/2), PbI2(dmso)2
Authors: Miyamae Hiroshi , Numahata Yoshinaho , Nagata Miharu
Published: July 2006

The crystal structure of the title compound has been determined by X-ray diffractometry. Two dimethylsulphoxide molecules co-ordinate to the Pb atom through their O atoms in trans position. The skeletal structure is a linear chain of [>Pb〈II〉] unit.
SIMPLE EVALUATION OF ENANTIOMER-SELECTIVITY OF CROWN ETHER USING MEMBRANE ELECTRODE
Authors: Yasaka Yuta , Yamamoto Takashi , Kimura Keiichi , Shono Toshiyuki
Published: July 2006

Enantiomer-selectivity of the crown ethers I through IV was evaluated by a membrane electrode method. Only chiral crown ether II showed some enantiomer-selectivity for both hydrochloride salts of phenylalanine methylester and phenylethylamine. This method was considered to be a convenient one for screening the enantiomer-selectivity of chiral crown ethers.
THE SIMPLE SYNTHESIS OF ETHYL 2,4-DIENOATES FROM ALDEHYDES AND ETHYL 2-PHENYLSULFINYLACETATE
Authors: Tanikaga Rikuhei , Nishida Masaharu , Ono Noboru , Kaji Aritsune
Published: July 2006

Treatment of aldehydes and ethyl 2-phenylsulfinylacetate (1)in the presence of piperidine gives Z-isomers (Z-2) of 2-phenylsulfinyl-2-alkylideneacetates (2). Thermolysis of Z-2 results in the formation of ethyl E,E-2,4-dienoates (3).
SELECTIVE REDUCTION OF α,β-UNSATURATED CARBONYL COMPOUNDS BY SODIUM HYDROTELLURIDE
Authors: Yamashita Masakazu , Kato Yukihiko , Suemitsu Rikisaku
Published: July 2006

Sodium hydrotelluride was found to serve as a new efficient agent for selective reduction of α,β-unsaturated carbonyl compounds under mild reaction conditions.
A NEW METHOD FOR THE DETERMINATION OF COPPER(II) BY THE CATALYTIC OXIDATION OF VARIAMINE BLUE B BASE ANALOGUE
Authors: Nakano Shigenori , Kuramoto Kazuhiro , Kawashima Takuji
Published: July 2006

A new sensitive and selective catalytic method for the determination of copper(II) is proposed. p-Anisidine reacts with N,N-dimethylaniline to form variamine blue B leuco base analogue. Copper (II) catalyzes the hydrogen peroxide oxidation of the analogue to a blue compound (λmax=740 nm). By the use of this reacqtion, as little as 10−8 M copper(II) can be determined easily.
HIGH-PRESSURE STOPPED-FLOW KINETICS OF PROTON-TRANSFER REACTION BETWEEN 4-NITROPHENYLNITROMETHANE AND 1,1′,3,3′-TETRAMETHYLGUANIDINE IN APROTIC SOLVENTS
Authors: Sasaki Muneo , Sugimoto Naoki , Osugi Jiro
Published: July 2006

The proton-transfer reaction between title compounds was kinetically studied in toluene and dichloromethane at 25°C up to 1000bar by the use of a high-pressure stopped-flow method. The volumes of activation were explainable on the basis of Kirkwood′s electrostatic model.
DISPROPORTIONATION OF CF3Cl CATALYZED BY Al2O3·Cr2O3
Authors: Okazaki Susumu , Erigughi Hideki
Published: July 2006

A mixed oxide of Al2O3 and Cr2O3 (Al2O3· Cr2O3) showed catalytic activity higher than that of Al2O3 or Cr2O3 in the disproportionation of CF3Cl. Maximum conversion (> 30 %) was obtained when the reaction was carried out over the mixed oxide (atomic ratio of Cr/Al:1/9) at 450°C.
X-RAY MOLECULAR STRUCTURE OF A PYRIDYL-BRIDGED DINUCLEAR PALLADIUM COMPLEX, trans(P,N)-[PdBr(μ-C5H4N-C2,N)(PPh3)]2
Authors: Nakatsu Kazumi , Kinoshita Kenji , Kanda Hitoshi , Isobe Kiyoshi , Nakamura Yukio , Kawaguchi Shinichi
Published: July 2006

The structure of the dinuclear complex obtained from the reaction of Pd(PPh3)4 and 2-bromopyridine was determined by X-ray analysis to be trans(P,N)-bis-[bromo(μ-pyridyl-C2,N)(triphenylphosphine)palladium(II)], having an approximate symmetry of C2.
A NEW ANTIAROMATIC HETEROCYCLAZINE: [1,3]THIAZINO[4,3,2-cd]INDOLIZINE
Authors: Kanemasa Shuji , Nakamura Seiichi , Kajigaeshi Shoji
Published: July 2006

A peripheral azomethine ylid 1,3-dipole, anhydro 2,3-dihydro-3-oxo-4H-pyrido[2,1-b][1,3]thiazinium hydroxide, underwent a cyclo-addition reaction to acrylic derivatives under dehydrogenating conditions giving 2,3-dihydro-3-oxo[1,3]thiazino[4,3,2-cd]indolizines. These cycloadducts were converted into the thiacyclazines with twelve electrons on the perimeter via reduction and subsequent dehydration. NMR spectra of the thiacyclazines showed appreciable shielding relative to simple indolizine and cycl[3.2.2]azine.
n-PENTANE ISOMERIZATION OVER SUPPORTED BINARY IODIDE CATALYSTS PREPARED FROM INTERMETALLIC-I2 SYSTEMS
Authors: Imamura Hayao , Soga Kazuo , Sato Masaru , Wallace W E
Published: July 2006

γ-Al2O3 or SiO2 supported binary iodide catalysts, which were prepared by impregnation of the mixtures formed from reacting ErAl3 with I2, exhibited the high ability to catalyze the n-pentane conversion at room temperature. The conversion easily progressed to form iso-pentane along with production of C4 and C6 hydrocarbons. Properties of the catalysts prepared closely related to supports used.
A REGIO- AND STEREOSELECTIVE SYNTHESIS OF γ,δ-UNSATURATED ALCOHOLS
Authors: Yamaguchi Masahiko , Mukaiyama Teruaki
Published: July 2006

(E)-Erythro-γ,δ-unsaturated alcohols are obtained in good yields by the regio- and stereoselective addition reaction of allylboranes, generated from lithiated 2-butenyloxybenzimidazole and trialkylboranes, with aldehydes and ketones.
CIDNP STUDY OF LIGHT-INDUCED ELECTRON-TRANSFER FROM HYDROQUINONE TO PHEOPHYTIN α
Authors: Maruyama Kazuhiro , Furuta Hiroyuki , Otsuki Tetsuo
Published: July 2006

Light-induced electron-transfer from hydroquinone to pheophytin α was investigated by means of CIDNP technique. Spin multiplicity of the excited pheophytin α concerned was solvent-dependent.
INFLUENCE OF BASICITY OF AXIAL LIGANDS ON REACTIONS OF BIS(α-FURILDIOXIMATO)IRON(II) WITH CARBON MONOXIDE
Authors: Sasaki Yoshihiro
Published: July 2006

Reactions of bis(α-furildioximato)iron(II), Fe(FrH)2(X)2, (X=pyridine, 4-cyanopyridine, 3-chloropyridine, 4-chloropyridine, 4-methylpyridine, 1-methylimidazole and butylamine) with carbon monoxide was studied kinetically in chloroform solutions. The reactions proceeded reversibly through a dissociative mechanism. The axial ligand-dissociation rate constants and the activation parameters of Fe(FrH)2(X)2 and Fe(FrH)2(X)(CO) were determined and discussed in terms of basicity of bases (X).
A NOVEL METHOD FOR THE GENERATION OF AN ESTER ENOLATE ANION FROM ETHOXYACETYLENE
Authors: Mukaiyama Teruaki , Murakami Masahiro
Published: July 2006

An ester enolate anion was generated in situ by the successive treatment of ethoxyacetylene with mercury(II) chloride, pyridine-1-oxide and zinc dust, and the zinc enolate thus formed further reacted with aldehydes to give α-chloro-β-hydroxyesters.
THE REACTION OF THIAZOLO[3,2-b]PYRIDAZINIUM PERCHLORATES WITH HYDRAZINES. FORMATION OF 1,4-BIS-(2-VINYL-3-PYRIDAZINYLIDENE)TETRAZENES
Authors: Satoh Kazue , Miyasaka Tadashi
Published: July 2006

Treatment of thiazolo[3,2-b]pyridazinium perchlorates with hydrazine hydrate in acetonitrile afforded the title compounds and several products depending upon its reaction time and temperature and difference of substituent. Catalytic reduction of the tetrazenes gave 2H-3,4-dihydropyridazino[6,1-c] triazines. Oxidation with 30% H2O2 yielded pyridazino[6,1-c]-3-triazinones.
2-METHYLENE-3-ALKOXYCYCLOPENTANONES AS REACTIVE INTERMEDIATES AND THEIR APPLICATION TO THE SYNTHESES OF DIHYDROJASMONE, CIS-JASMONE, AND (±)-JASMOLOLONE
Authors: Takahashi Takashi , Hori Kimihiko , Tsuji Jiro
Published: July 2006

Dihydrojasmone and cis-jasmone were synthesized in high yields by the Michael addition of lithium di-n-butylcuprate and bromomagnesium di-1-butenylcuprate, respectively, to 2-methylene-3-methyl-3-methoxymethyloxycyclopentanone. (±)-Jasmololone was also synthesized by the Michael addition of dialkenylcuprate to 2-methylene-3-methyl-3-methoxymethyloxy-4-ethoxyethyloxycyclopentanone.
LARGE INDUCED CIRCULAR DICHROISM OF METHYL ORANGE BOUND TO CHIRAL BILAYER MEMBRANES. ITS EXTREME SENSITIVITY TO THE PHASE TRANSITION AND THE CHEMICAL STRUCTURE OF THE MEMBRANE
Authors: Nakashima Naotoshi , Fukushima Hiroshi , Kunitake Toyoki
Published: July 2006

Large circular dichroism is induced when Methyl Orange is bound to the bilayer membrane of chiral dialkyl amphiphiles and the magnitude of the induced circular dichroism is changed drastically by the gel-to-liquid crystal phase transition and the chemical structure of the membrane.
SIMPLE SYNTHESIS OF 9-(5-DEOXY-β-d-ERYTHRO-PENT-4-ENOFURANOSYL)ADENINE FROM ADENOSINE BY SELENOXIDE FRAGMENTATION
Authors: Takaku Hiroshi , Nomoto Tadaaki , Kimura Kenji
Published: July 2006

5′-Se-(2-Nitrophenyl)-5′-selenoadenosine (3) was selectively synthesized by the reaction of adenosine with 2-nitrophenylselenocyanate and tri-n-butylphosphine. The selenide 3 was oxidized by treatment with excess hydrogen peroxide to the corresponding selenoxide (4), which readily undergo syn elimination under mild conditions to give the corresponding 9-(5-deoxy-β-d-erythro-pent-4-enofuranosyl)-adenine (5) in good yield.
STRUCTURES OF LEUKAMENINS
Authors: Takeda Yoshio , Fujita Tetsuro , Ueno Akira
Published: July 2006

Six new diterpenoids, leukamenin A, B, C, D, E and F with 15-oxo-ent-kaurene skeleton were isolated from the leaves of Rabdosia umbrosa var. leucantha f. Kameba and their structures were deduced from chemical and spectral evidence.
1,2-CARBONYL TRANSPOSITION OF CIS-BICYCLO[3.3.O]OCTAN-2-ONE TO ITS 3-ONE SKELETON: APPLICATION TO SYNTHESES OF dl-HIRSUTIC ACID AND dl-9(0)-METHANOPROSTACYCLIN
Authors: Yamazaki Mayumi , Shibasaki Masakatsu , Ikegami Shiro
Published: July 2006

A synthetic route to dl-hirsutic acid and an improved synthesis of dl-9(0)-methanoprostacyclin, both of which employ the 1,2-carbonyl transposition as a key step, are described.
DIALKYL 3-ALKOXY-3-(TRIMETHYLSILOXY)-2-PROPENEPHOSPHONATE; A ONE STEP PREPARATION OF (DIALKOXYPHOSPHINYL)METHYL-SUBSTITUTED KETENE ALKYL TRIMETHYLSILYL ACETAL
Authors: Okamoto Yoshiki , Azuhata Toshio , Sakurai Hiroshi
Published: July 2006

In the presence of chlorotrimethylsilane, trialkyl phosphite reacts smoothly with alkyl acrylates to give dialkyl 3-alkoxy-3-(trimethylsiloxy)-2-propenephosphonates in good yields.
Enantioface Differentiating Hydrogenation of β-Ketosulfone
Authors: Hiraki Yuji , Ito Kazuhisa , Harada Tadao , Tai Akira
Published: July 2006

The enantioface-differentiating hydrogenation of β-ketosulfone (I) over (R,R)-tartaric acid-NaBr-modified Raney nickel ((R,R)-TA-NaBr-MRNi) gave β-nydroxysulfone (II) in quantitative chemical yield and 70% optical yield. The optically pure II was obtained from the hydrogenation product by the preferential recrystallization method.
SYNTHESIS OF AMINO ACID BONDED SILICA GEL VIA ACTIVE ESTER WITH N-HYDROXYSUCCINIMIDE
Authors: Watanabe Noriyuki
Published: July 2006

The surface of silica gel was chemically modified by amino acid via active ester with N-hydroxysuccinimide. The formations of insoluble by-product and fine particle coming from silica gel, which occur in DCC method were avoided. The amounts of amino acid coupling to silica gel were about twice larger than that by DCC method.
ANOTHER SYNTHESIS OF (±)-MESEMBRINE USING A SYMMETRIC STARTING MATERIAL
Authors: Takano Seiichi , Imamura Yoko , Ogasawara Kunio
Published: July 2006

(±)-Mesembrine(10) has been synthesized efficiently via the vinylogous amide(9) using the symmetric substrate(1) as starting material.
DIRECT ALKYLAMINATION OF 1,4-DIHYDROXYANTHRAQUINONE IN THE PRESENCE OF SODIUM DITHIONITE
Authors: Kikuchi Masashi , Yamagishi Takamichi , Hida Mitsuhiko
Published: July 2006

In the presence of sodium dithionite, 1,4-dihydroxyanthraquinone reacted with n-butylamine to give 2-butylamino-1,4-dihydroxyanthraquinone in high yield under air. Under a nitrogen atmosphere, this reaction gave 1,4-bis(butylamino)anthraquinone nearly quantitatively.
THE CRYSTAL STRUCTURE OF μ-l-TARTRATO-DICOBALT(III) COMPLEX, Δ-cis(O,O),trans(O,O)-[(en)2Co(tart)(3−)Co(tart)(1−)(en)2]Na(C1O4)3·5H2O
Authors: Matsumoto Yuji , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatsujiro , Kimura Takashi , Sakurai Tosio
Published: July 2006

The title compound was prepared by the reaction of l-tartaric acid with [CoCO3(en)2]Br. It contains a dimer cation in which two cobalt atoms are bridged through a tridentate tartrate anion. The configuration about one cobalt atom is Δ-cis, and about another is trans(O,O).
EFFICIENT STEREOSELECTIVE SYNTHESIS OF rel-(6S,7S,8S)-7-BUTYL-8-HYDROXY-1-AZASPIRO[5.5]UNDECAN-2-ONE, A KEY INTERMEDIATE FOR PERHYDROHISTRIONICOTOXIN, AND ITS rel-(6R) ISOMER
Authors: Ibuka Toshiro , Minakata Hiroyuki , Mitsui Yoshinori , Tabushi Eiji , Taga Tooru , Inubushi Yasuo
Published: July 2006

Using 3-t-butyldimethylsilyloxy-1-cyclohexenyl methyl ketone as a starting material, a simple stereoselective synthesis of rel-(6S,7S,8S)-7-butyl-8-hydroxy-1-azaspiro[5,5]undecan-2-one, a useful intermediate for the synthesis of pharmacologically important alkaloid perhydrohistrionicotoxin, and its rel-(6R) isomer, was described.
OPTOACOUSTIC STUDY OF THE INFRARED MULTIPHOTON EXCITATION OF SF6
Authors: Fukumi Toshio
Published: July 2006

The optoacoustic effect was used to detect the infrared multiphoton excitation of SF6 as a function of laser wavelength and laser energy fluence. The red shift of the multiphoton excitation specra was observed and from the laser fluence dependence of the intensity of optoacoustic signals, this phenomenum was found to be arised from the resonance of multiquantum transitions to the overtone levels of SF6.
PREPARATION AND CRYSTAL STRUCTURE OF BIS(l-PHENYLEPHRINATO)COPPER(II) MONOHYDRATE
Authors: Nakai Hisayoshi , Noda Yukinao
Published: July 2006

The title compound was prepared, and its structure was determined by the X-ray method. The copper environment is trans-square planar and the two phenylephrinato ligands act as bidentate ligands through the N and O(alcolato) atoms.
AMMONIA SYNTHESIS FROM CARBON MONOXIDE, WATER, AND DINITROGEN OVER Ru–MgO–Cs2O
Authors: Uchiyama Soichi , Hattori Yasuyuki , Aika Ken-ichi , Ozaki Atsumu
Published: July 2006

NH3 is formed from CO, H2O, and N2 at a steady rate over Ru–MgO–Cs2O without forming any hydrocarbons at 370° to 430°C under 1 atm. The rate is proportional to N2 pressure, increases with H2O pressure, but has a maximum at about 5 Torr of CO pressure at 405°C. Normal hydrogen isotope effect was observed both in the title reaction and in the water gas shift reaction.
SYNTHESIS AND PHOTOCHEMICAL REACTIVITY OF O-ALKYLMALEIMIDE
Authors: Izawa Yasuji , Yokoi Kanemasa , Tomioka Hideo
Published: July 2006

Irradiation of O-alkylmaleimide, prepared by the reaction of silver maleimide with alkyl bromide, resulted in Norrish type II elimination presumably initiated by γ-hydrogen abstraction of excited carbon–nitrogen double bond.
THE STRUCTURE OF TRANS-DICHLORO(1,4,8,11-TETRAAZACYCLOTETRADECANE)NICKEL(III) PERCHLORATE
Authors: Ito Tasuku , Sugimoto Masako , Toriumi Koshiro , Ito Haruko
Published: July 2006

The Ni in the title compound, [NiIIICl2L](ClO4), has an octahedral geometry of trans-NiCl2N4 type and is in the trivalent state. The Ni–N and Ni–Cl distances average 1.970(4) and 2.452(4) Å, respectively.
HIGH RESOLUTION 13C NMR SPECTRA OF CHITIN OLIGOMERS IN AQUEOUS SOLUTION
Authors: Saitô Hazime , Mamizuka Takashi , Tabeta Ryoko , Hirano Shigehiro
Published: July 2006

13C NMR spectra of chitin oligomers in aqueous solution were analyzed for a reference of assignment of solid state 13C NMR spectra of chitin and N-acyl chitosans, and also of 13C chemical shift data in aqueous solution.
SOME GRAPHITE LAMELLAR STRONG AND SUPER ACIDS AS CATALYSTS IN THE ISOMERIZATION AND CLEAVAGE REACTIONS OF PENTANE AND HEXANE
Authors: Yoneda Norihiko , Fukuhara Tsuyoshi , Abe Takafumi , Suzuki Akira , Kudo Kazuyoshi
Published: July 2006

Graphite lamellar catalysts of acids; SbF5, SbF5–HF and AlBr3–Br2 were found to be effective for the isomerization and cleavage reactions of pentane and hexane at room temperature. Graphite-SbF5–HF catalyst was excellent and gave skeletal isomerization products exclusively from pentane and hexane. Graphite-AlBr3–Br2 catalyst showed a highly catalytic activity to yield C4∼C7 alkanes which were formed via the β-cleavage reaction of oilgomeric alkyl cations derived from starting alkanes. Graphite-SbF5catalyst exhibited catalytic behavior and gave skeletal isomerization products exclusively for pentane but gave C4∼C7 alkanes as the major products for hexane.
X-RAY CRYSTAL STRUCTURE OF NEODYMIUM NITRATE COMPLEX WITH TETRAETHYLENE GLYCOL
Authors: Hirshima Yoshiyuki , Tsutsui Toshiyuki , Shiokawa Jiro
Published: July 2006

Neodymium atom is decacoordinated with oxygen atoms in the title complex, where tetraethylene glycol acts as a pentadentate ligand, forming a ring-like structure together with a unidentate nitrate. Two bidentate nitrates coordinate to neodymium atom from above and below the plane formed by tetraethylene glycol.
FORMATION OF BUTANE FROM BUTANOL CATALYZED BY Fe2O3, Fe2O3–ZrO2, AND Fe2O3–ZnO
Authors: Jin Tuo , Hattori Hideshi , Tanabe Kozo
Published: July 2006

A considerable amount of butane was found to form from 1-butanol or 2-butanol over Fe2O3, Fe2O3–ZrO2, and Fe2O3–ZnO at 250°C. The effect of hydrogen addition on the formation of butane was small. The mechanism is suggested to involve a nucleophilic substitution of OH− by H− which is liberated in the dehydrogenation of butanols.
ION-DIPOLE ASSOCIATION CHROMATOGRAPHY ON ION EXCHANGER IN NON-AQUEOUS MEDIA. SEPARATION AND CHARACTERIZATION OF CROWN ETHERS AND RELATED COMPOUNDS
Authors: Aoki Shin-ichi , Shiga Masanobu , Tazaki Masato , Nakamura Hiroshi , Takagi Makoto , Ueno Keihei
Published: July 2006

A silica gel-bound sulfonate type cation exchanger was used as a stationary phase in organic media for the chromatographic separation of crown ethers through the ion-dipole interaction. Crown ethers were retained on the column depending on the nature of metals on the ion exchanger, while the open-chain homologues showed only a limited affinity to the column. The chromatography was useful for the analysis and characterization of crown ethers and related compounds.
RADICAL CHROMATOGRAPHY OF SPIN ADDUCTS PRODUCED FROM γ-IRRADIATED LINOLEIC ACID IN NONAQUEOUS SOLUTION
Authors: Taniguchi Hitoshi , Aoshima Hitoshi
Published: July 2006

Spin adducts produced from γ-irradiated linoleic acid in an ethanol solution containing 2-methyl-2-nitrosopropane could be separated into nine fractions with high performance liquid chromatography. Distinct ESR spectra were observed from seven fractions and radical structures were identified for two major components.
NEW CHIRAL AMINOPHOSPHINES PREPARED FROM l-ORNITHINE AND CATALYTIC ASYMMETRIC HYDROGENATION USING THEIR RHODIUM(I) COMPLEXES
Authors: Osakada Kohtaro , Ikariya Takao , Saburi Masahiko , Yoshikawa Sadao
Published: July 2006

From readily preparable chiral diamines were obtained new aminophosphines, (3S)-[N,N′-bis(diphenylphosphino)]-3-aminopiperidine, and (3S)-[N,N′-bis(diphenylphosphino)]-3-(methylamino)piperidine. Asymmetric hydrogenation of α-acylaminoacrylic acids, employing Rh(I) complexes with these aminophosphines as catalyst, gave optically active N-acyl-α-amino acids.
DUAL COORDINATION BEHAVIOR OF MONOETHANOLAMINE IN HOFMANN-MEA-TYPE CLATHRATES Cd(NH2CH2CH2OH)2Ni(CN)4·C4H5N AND Cd(NH2CH2CH2OH)Ni(CN)4·2C6H6
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake
Published: July 2006

In the host structures of the novel clathrates Cd(mea)2Ni(CN)4·C4H5N and Cd(mea)Ni(CN)4·2C6H6 the mea (= NH2CH2CH2OH) behaves as a unidentate ligand in the former and as an ambident one in the latter.
PREPARATION OF RED ORGANIC PIGMENT WITH SILICA GEL AS CORE
Authors: Suzuki Mituru , Itô Seisirô , Kuwahara Tosihide
Published: July 2006

Red organic pigment with silica gel as core was prepared by deriving the surface silanols of silica gel to the structure similar to azo dyestuff, such as Sudan I. The surface silanols were esterified with phenylmethanol, and the introduced phenyl group was nitrated, reduced, diazotized and coupled with 2-naphthol as shown in Fig. 1. The prepared pigment showed approximately same color as Sudan I.
A NEW METHOD FOR THE PREPARATION OF SUBSTITUTED PYRROLOANTHRONE
Authors: Arai Sadao , Yamagishi Takamichi , Hida Mitsuhiko
Published: July 2006

1-Benzylaminoanthraquinone reacted with benzyl chloride in the presence of powdered KOH in DMSO to give spiro[1-dibenzylamino-10-anthrone-9,3′-[2]phenyloxirane] (1) quantitatively under a nitrogen atmosphere. The oxirane (1) was converted into 1-phenyl-2-benzylpyrrolo[4,3,2-mn]anthracene-6-one (2) (substituted pyrroloanthrone) having strong fluorescence in ethanol by treatment with hydrochloric acid.
ELECTRONIC RAMAN BANDS IN POTASSIUM FERRICYANIDE
Authors: Ohata Atsuko , Morioka Yoshiyuki , Nakagawa Ichiro
Published: July 2006

In the Raman spectrum of potassium ferricyanide several new bands were found at low temperatures. The Raman bands at 665 cm−1 and 840 cm−1 are assigned to the electronic transitions within a ground state manifold of a low-spin Fe3+ ion and that at 935 cm−1 is attributed to a vibronic transition.
SYNTHESIS AND CHARACTERIZATION OF μ-OXO BIS(METHOXOOCTAETHYLPORPHYRINATOOSMIUM(IV))
Authors: Sugimoto Hiroshi , Mori Masayasu
Published: July 2006

The oxidation of octaethylporphyrinatoosmium(II)carbonyl with 2,3-dimethylindole/O2 gave a new tetravalent osmium complex. The elemental analysis, molecular weight measurement and spectroscopic data indicate that this complex is a diamagnetic linear μ-oxo dimer of octaethylporphyrinatoosmium(IV) methoxide; [OEPOs(IV)OCH3]2O.
X-RAY PHOTOELECTRON SPECTRA OF COBALT(III) COMPLEXES WITH SEVERAL KINDS OF SULFUR DONOR ATOMS
Authors: Kita Masakazu , Yamanari Kazuaki , Kishi Kosaku , Ikeda Shigero , Shimura Yoichi
Published: July 2006

The X-ray photoelectron spectroscopic data of 25 cobalt(III) complexes of CoNxS6−x types are reported(x = 6, 5, 4, 3, and 0). The S2p3⁄2 binding energies can readily be distinguished into eight types of sulfur ligands. The S2p3⁄2, Co2p3⁄2, and Nls binding energies are distributed between two extremes; one represents the case of thiolato and sulfenato complexes, and the other sulfinato and sulfito ones. These results are discussed in connection with the structural trans effect.
ASYMMETRIC CYCLOPROPANATION OF FUMARATES WITH METHYLENE BROMIDE CATALYZED BY COBALT OR NICKEL COMPLEXES
Authors: Matsuda Hideki , Kanai Hiroyoshi
Published: July 2006

Highly optically active trans-1,2-cyclopropanedicarboxylic acid derivatives were prepared from chiral fumarates and methylene bromide catalyzed by cobalt(0) or nickel(0) complexes.
PALLADIUM-PROMOTED REACTION OF ALLYL TRIMETHYLSILYL ETHERS WITH ARYL IODIDES
Authors: Hirao Toshikazu , Enda Jun , Ohshiro Yoshiki , Agawa Toshio
Published: July 2006

Allyl trimethylsilyl ether reacts with aryl iodides in the presence of palladium acetate and lithium chloride to afford selectively β-aryl (E)-α,β-unsaturated carbonyl compound.
A CONVENIENT ALLYLATION OF ORTHO-QUINONES. AN EXTENSION ON THE UTILITY OF ALLYLTIN REAGENTS
Authors: Maruyama Kazuhiro , Takuwa Akio , Naruta Yoshinori , Satao Kuniaki , Soga Osamu
Published: July 2006

Lewis acid catalyzed allylation of 1,2-naphthoquinones and o-benzoquinones with allyltributyltins gave monoallylation products in reasonable to high yields.
ON THE UNUSUAL SPECTROSCOPIC BEHAVIORS OF 3-METHYL-10-DODECYLISOALLOXAZINE(AMPHIPHILIC FLAVIN ANALOGUE)
Authors: Shinkai Seiji , Harada Akiko , Ishikawa Yu-ichi , Manabe Osamu , Yoneda Fumio
Published: July 2006

At room temperature in aqueous solution, the visible absorption peak of the title isoalloxazine (III) gives a three-banded fine structure, which has been believed to appear only in enzymatic hydrophobic region, in nonpolar solvents, or at extremely low temperature. On the other hand, another amphiphilic flavin 3-hexadecyl-10-butylisoalloxazine (II) has not such a fine structure. Thus, the unusual fine structure in (III) was attributed to aggregative “stacking” of the isoalloxazine heads, and the difference in the stacking mode between (II) and (III) was discussed.
CATALYSIS OF HETEROPOLY ACIDS ENTRAPPED IN ACTIVATED CARBON
Authors: Izumi Yusuke , Urabe Kazuo
Published: July 2006

Activated carbon was found to be able to entrap a certain amount of heteropoly acids, resulting in solid acid catalysts. Heteropoly acids thus entrapped were hardly removed even by extraction with hot water or hot methanol. The entrapped catalysts offer convenient methods for liquid-phase etherification of alcohols and vapor-phase selective esterification.
CONVERSION OF HUMULENE TO ZERUMBONE
Authors: Shirahama Haruhisa , Chhabra Baldev R , Matsumoto Takeshi
Published: July 2006

Humulene was first converted to zerumbone through a sequence of chemical reactions.
STEREOSELECTIVE SYNTHESIS OF α,β-EPOXYPHENYLKETONES FROM α,α-DIBROMOPHENYLKETONES AND ALDEHYDES USING STANNOUS FLUORIDE
Authors: Shoda Shin-ichiro , Mukaiyama Teruaki
Published: July 2006

trans-α,β-Epoxyphenylketones are stereoselectively synthesized via aldol type intermediates under mild conditions starting from α,α-dibromophenylketones and aldehydes using stannous fluoride.
THE ELECTROCHEMICAL REDUCTION OF BENZOYL AZIDE IN ACETONITRILE
Authors: Arai Toshio , Shingaki Tadao , Inagaki Masao
Published: July 2006

The electrochemical reduction of benzoyl azide in acetonitrile was investigated. As the products, N-benzoyl benzamide, benzamide, and benzoic acid were obtained, and the presence of azide anion (N3−) was observed in the electrolytic solution. A tentative mechanism of the electrochemical reduction was advanced.
COORDINATION-SITE EXCHANGE REACTIONS OF SOME ACETYLACETONATO PALLADIUM(II) COMPLEXES: AUTOCATALYSIS AND SELF-CATALYSIS
Authors: Tanaka Hiroshi , Isobe Kiyoshi , Kawaguchi Shinichi
Published: July 2006

A novel type of palladium(II) complexes containing a chelated acetylacetonate anion, carbon-bonded pyridyl ligand, and triphenylphosphine were prepared. They undergo the coordination-site exchange catalyzed by the phosphine freed from the reacting complex (autocatalysis) or the nitrogen end of the carbon-bonded pyridine in the reacting species (self-catalysis).
THE ASYMMETRIC MICHAEL REACTION OF (2R,3S)-3,4-DIMETHYL-2-PHENYLPERHYDRO-1,4-OXAZEPINE-5,7-DIONE WITH 1-NITROCYCLOHEXENE
Authors: Takeda Takeshi , Hoshiko Tomonori , Mukaiyama Teruaki
Published: July 2006

Optically active (2-nitrocyclohexyl)acetic acid(III) was obtained by the Michael reaction of (2R,3S)-3,4-dimethyl-2-phenylperhydro-1,4-oxazepine-5,7-dione(I) with 1-nitrocyclohexene in the presence of potassium t-butoxide (or cesium fluoride) and crown ether, followed by acid hydrolysis.
METHYLATED DERIVATIVES FROM THE HYDROLYSIS PRODUCTS OF SAFFLOMIN-A
Authors: Onodera Jun-ichi , Sato Shingo , Obara Heitaro
Published: July 2006

New methoxy-chalcone and flavanone derivatives were obtained by the methylation of the hydrolysis products of safflomin-A (1), a yellow component of the flowers of Safflower (Carthamus tinctorius L.). The formation of these derivatives significantly contributes to the elucidation of the structure of 1, proposed by us.
REDUCTION MECHANISM OF 12-MOLYBDO- AND 12-TUNGSTOPHOSPHORIC ACIDS IN THE SOLID STATE
Authors: Katamura Koichi , Nakamura Teiji , Sakata Kanji , Misono Makoto , Yoneda Yukio
Published: July 2006

On the basis of the temperature programmed reduction (TPR) by hydrogen and infrared spectral changes during reversible reduction-oxidation cycle, it was concluded that 12-molybdophosphoric acid in the solid state is reduced in two steps: H2 → 2H++ 2e → H2O . Reducibility of heteropoly acids measured by TPR exhibited fair correlation with their catalytic activity for methacrolein oxidation.
DETERMINATION OF CONFIGURATION OF MONOSACCHARIDES BY HPLC ON DIASTEREOISOMERIC 1-DEOXY-1-(N-ACETYL-α-METHYLBENZYLAMINO)ALDITOL ACETATES
Authors: Oshima Ryuichi , Kumanotani Ju
Published: July 2006

Acyclic diastereoisomers, 1-deoxy-1-(N-acetyl-α-methylbenzylamino)alditol acetates, are readily obtained by reductive amination of sugars with chiral α-methylbenzylamine in the presence of sodium cyanoborohydride. Ten pairs of enantiomers of common monosaccharides are resolved by an adsorption HPLC on the diastereoisomers.
NORCARADIENE–CYCLOHEPTATRIENE EQUILIBRIUM IN 7-ALKYL-7-CYANOCYCLOHEPTATRIENES
Authors: Takahashi Kazuko , Takase Kahei , Toda Hideo
Published: July 2006

The steric effect on the cycloheptatriene (CHT)–norcaradiene (NCD) equilibrium has been studied in simple 7-alkyl-7-cyanocycloheptatrienes, such as 7-ethyl-, 7-benzyl-, 7-isopropyl-, 7-cyclopropenyl-, and 7-tert-butyl-7-cyanocycloheptatrienes. The NCD component increases with bulkiness of the 7-alkyl group in this order, but the cycloheptatriene carrying an extremely bulky 7-tert-butyl group is out of this order.
THE MOLECULAR-SYMMETRY REDUCTION IN SOME CYCLIC DIFULVALENE SYSTEMS
Authors: Toyota Azumao , Nakajima Takeshi
Published: July 2006

The energetically favorable molecular-symmetry groups of some cyclic difulvalene systems are examined by using the theory of double bond fixation. It is found that molecules 2 and 5 should suffer the symmetry reduction from D2h to C2h and molecules 1, 3, 4, and 6 show no symmetry reduction. Further, a simple rule for predicting the stable molecular shapes of these systems is presented.
THE CLAISEN REARRANGEMENT USING β-ALKYLTHIO-β,γ-UNSATURATED ALCOHOLS. A NEW METHOD FOR THE PREPARATION OF FURANS AND γ-OXOCARBOXYLIC ESTERS
Authors: Takeda Takeshi , Fujiwara Tooru
Published: July 2006

Various furans and γ-oxocarboxylic esters were prepared by the pivalic acid-promoted Claisen rearrangement using β-alkylthio-β,γ-unsaturated alcohols followed by the treatment of the rearrangement products with an acid catalyst such as hydrochloric acid or sulfuric acid in good yields.
DYNAMIC STUDY ON THE QUENCHING OF THE EMISSION OF TRIS(BIPYRIDINE)RUTHENIUM(II) BY N,N′-DIMETHYL-4,4′-BIPYRIDINIUM (DMBP) WITH SODIUM DODECYLSULFATE IN THE PREMICELLAR REGION: ENHANCED ELECTRON TRANSFER IN DMBP-INDUCED PREMICELLES
Authors: Sato Hiroyasu , Kawasaki Masahiro , Kasatani Kazuo , Ban Taketora
Published: July 2006

A dynamic study was made on the quenching of the emission of tris(bipyridine)ruthenium(II) by N,N′-dimethyl-4,4′-bipyridinium (DMBP) in the presence of sodium dodecylsulfate, most enhanced in the premicellar region. It revealed that the enhancement is due to the DMBP-induced formation of premicelles in which a very effective electron transfer occurs.
CARBOXYLATION OF 1-ACYLINDOLES WITH CARBON MONOXIDE AND PALLADIUM ACETATE IN THE PRESENCE OF SODIUM PEROXYDISULFATE
Authors: Itahara Toshio
Published: July 2006

A treatment of 1-acylindoles with palladium acetate and sodium peroxydisulfate under a carbon monoxide atmosphere gave the corresponding 1-acylindole-3-carboxylic acids.
SYNTHESIS OF NEW 2-OXAZOLINONES FROM N-CARBOXY α-DEHYDROAMINO ACID ANHYDRIDES
Authors: Yonezawa Yasuchika , Shin Chung-gi , Ohtsu Akira , Yoshimura Juji
Published: July 2006

Addition of methanol to N-carboxy α-dehydroamino acid anhydride in the presence of NBS, followed by the treatment of the resulting product with base gave a new 2-oxazolinone-4-carboxylate.
PHOTOLYSIS OF [n.2.2]PROPELLANONES INVOLVING A CYCLOBUTANONE RING
Authors: Tobe Yoshito , Kanazawa Yukihiko , Kakiuchi Kiyomi , Odaira Yoshinobu
Published: July 2006

Photolysis of [n.2.2]propellanones (5) and (6) involving a cyclobutanone ring in methanol afforded the cycloelimination products 7 and 9 in good yields, especially in the case of highly strained [3.2.2]propellanone (6), via α-cleavage in the direction leading to the less favorable acyl-alkyl radical pair.
ALKYLATION OF TRIMETHYLSILYLCYCLOPENTADIENIDE ANION WITH tert-BUTYL BROMOACETATE. A DESILYLATION REACTION ASSISTED BY A REMOTE STERIC REPULSION
Authors: Carceller Elena , Massó Teresa , Serratosa Fèlix , Vilarrasa Jaume
Published: July 2006

Alkylation of trimethylsilylcyclopentadienide anion with tert-butyl bromoacetate, in contrast with the alkylation with the corresponding methyl ester, proceeds with simultaneous elimination of the trimethylsilyl group. A peculiar, long-distance steric effect is postulated.
GENERATION OF SINGLET OXYGEN ON IRRADIATION OF CONTACT CHARGE–TRANSFER PAIRS OF 1,2,3,4-TETRAMETHYLNAPHTHALENE WITH OXYGEN
Authors: Sakuragi Hirochika , Furusawa Gen-ichi , Ueno Katsuhiko , Tokumaru Katsumi
Published: July 2006

Irradiation of 1,2,3,4-tetramethylnaphthalene (1) in methanolbenzene (1:1) or methanol-acetonitrile (1:1) under oxygen with 366nm light resulted in the formation of an epoxyalcohol (2), a diol (3), an enediol (4), and an endoperoxide (5). Based on some features of the reaction, it is assumed that this photooxygenation is due to singlet oxygen generated on excitation of the contact charge–transfer pairs of 1 with oxygen.
DIOXYGEN ABSORPTION BY A 2:1 COPPER(II)-DISULFIDE SYSTEM. PARTIAL INCORPORATION OF OXYGEN ATOMS FROM DIOXYGEN UPON COPPER(II)-CATALYZED DISULFIDE BOND CLEAVAGE TO SULFINATE
Authors: Yamauchi Osamu , Seki Hiroko
Published: July 2006

Synthetic and spectroscopic studies have established that the oxygen atoms from dioxygen are partly incorporated into the sulfinate moiety of the Cu(II)-2-[(2-pyridylmethyl)amino]ethylsulfinate complex upon the Cu(II)-catalyzed disulfide bond cleavage of bis {2-[(2-pyridylmethyl)amino]ethyl}disulfide under dioxygen.
THE REACTION OF TERMINAL ALKYNES WITH THE REAGENT PREPARED FROM BENZENESELENENYL BROMIDE AND SILVER NITRITE. NOVEL EFFICIENT SYNTHESIS OF 1-ALKYNYL PHENYL SELENIDES
Authors: Hayama Takashi , Tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

1-Alkynyl phenyl selenides were synthesized in good yields by the reaction of 1-alkynes with a new reagent prepared from benzeneselenenyl bromide and silver nitrite.
A CONVENIENT PREPARATIVE METHOD OF CARBOHYDRATE PHOSPHATES WITH BUTYLLITHIUM AND PHOSPHOROCHLORIDATE
Authors: Inage Masaru , Chaki Haruyuki , Kusumoto Shoichi , Shiba Tetsuo
Published: July 2006

α-Glycosyl phosphates and 4-phosphates of N-acylglucosamine derivatives were prepared in high yields via the reaction of corresponding O-lithium salts with dibenzyl or diphenyl phosphorochloridate at low temperature.
REACTION OF SYN HEAD-TO-HEAD COUMARIN DIMER WITH AMINES AND THERMAL BEHAVIOR OF THE ADDUCTS
Authors: Hasegawa Masaki , Katsuki Hirokazu , Yonezawa Noriyuki , Yoshida Tsuyoshi , Ikebe Yutaka
Published: July 2006

The lactone-opening reaction of syn head-to-head coumarin dimer with amines gave c-3,c-4-bis(2-hydroxyphenyl)-r-1,c-2-cyclobutanedicarboxamides and/or -dicarboximides. The product ratio of the amide to the imide varied with the reaction temperature and the amount of amine used. Thermal reaction of these lactone-opened derivatives proceeded in two ways depending on the nature of amine moiety to give either the original coumarin dimer or 2,2’-dihydroxystilbene and the maleimide derivative.
TOTAL SYNTHESIS OF MIMOCIN
Authors: Matsuo Keizo , Okumura Masao , Tanaka Kuniyoshi
Published: July 2006

Mimocin (1), an isoquinolinequinone antibiotic, is synthesized in ten steps starting from 2,3,6-trimethoxytoluene.
COPPER(I) IODIDE ASSISTED REACTION OF NONACTIVATED IODOARENES WITH SODIUM TRIFLUOROACETATE IN HEXAMETHYLPHOSPHORIC TRIAMIDE. NUCLEAR TRIFLUOROMETHYLATION AND DIARYL ETHER FORMATION
Authors: Suzuki Hitomi , Yoshida Yoshiki , Osuka Atsuhiro
Published: July 2006

Polymethyliodobenzenes react with sodium trifluoroacetate, in tine presence of copper(I) iodide, in hexamethylphosphoric triamide at 150–180°C, giving a mixture of the corresponding polymethylbenzotrifluoride, parent hydrocarbon, and bis(polymethylphenyl) ether.
PREPARATION OF A NOVEL DINUCLEAR COMPLEX OF PALLADIUM BRIDGED BY DIANION OF DIACETONE ALCOHOL
Authors: Suzuki Hiroharu , Moro-Oka Yoshihiko , IKAWA Tsuneo , Miyajima Tohru , Tanaka Isao , Ashida Tamaichi
Published: July 2006

Novel dinuclear complex of palladium coordinating dianion of diacetone alcohol is prepared by the reaction of a μ-peroxo complex of palladium with acetone or diacetone alcohol. Coordination of the dianion of diacetone alcohol is confirmed by means of X-ray structural analysis.
AN ALDOL-TYPE REACTION OF ACETONITRILES USING DIALKYLBORYL TRIFLATE
Authors: Hamana Hiroshi , Sugasawa Tsutomu
Published: July 2006

Acetonitriles and benzaldehydes react in the presence of dialkyl boryl triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products in good yields under mild conditions.
CYCLIZATION REACTION THROUGH OXIRANE RING CLEAVAGE OF 9,10-EPOXYHUMULA-2,6-DIEN-13-AL. SELECTIVE FORMATION OF 3,6-SECOPROTOILLUDANE AND BICYCLOHUMULANE SKELETONS
Authors: Shirahama Haruhisa , Hayano Kiyoharu , Arora Gurdial Singh , Ohtsuka Toshikazu , Murata Yoshihiko , Matsumoto Takeshi
Published: July 2006

9,10-Epoxyhumula-2,6-dien-13-al gave 3,6-secoprotoilludane derivatives by treatment with TMSOTf and a bicyclohumulane derivative by BF3·OEt2 selectively in each case.
ENANTIOSELECTIVE CROSS ALDOL REACTION VIA DIVALENT TIN ENOLATE
Authors: Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

Highly enantioselective cross aldol reaction between aromatic ketones and various aldehydes is achieved via divalent tin enolates employing chiral diamines derived from (S)-proline as ligands.
SURFACE SUBCARBONYLS IMPREGNATED BY THE REACTIONS BETWEEN Co2(CO)8 AND γ-Al2O3 OR SiO2
Authors: Nakamura Ryuichi , Oomura Akihiro , Okada Norio , Echigoya Etsuro
Published: July 2006

Some different surface subcarbonyls such as [Co4(CO)12]ads., [Co2(Co)6B2], and [Co(Co)3B]2, (B = O2−, OH− on the supports, were observed in the impreganation of Co2(CO)8 with preheated γ-Al2O3 and SiO2 supports at 298 K. Their relative concentrations distinctly depend on the Co loading as well as the support.
REACTION OF TRIMETHYLSILYL AZIDE WITH ORGANIC HALIDES
Authors: Nishiyama Kozaburo , Karigomi Hiroshi
Published: July 2006

Trimethylsilyl azide reacted readily with benzyl, allyl, and aliphatic halides to give the corresponding azides in good to excellent yields.
STUDIES ON THE NEW CRYSTALLINE PHASE OF AZAFERROCENE AND RUTHENOCENE
Authors: Kubo Atsushi , Ikeda Ryuichi , Nakamura Daiyu
Published: July 2006

A new low-temperature phase of azaferrocene Fe(C5H5)(C4H4N), stable below 281 K, was found from the measurements of proton spinlattice relaxation time T1, and differential thermal analysis. For ruthenocene Ru(C5H5)2, a phase transition was located at 392 K.
A NOVEL TETRAVALENT SULFUR COMPOUND, 1,3,6-TRIPHENYLIMIDAZO[ 1,2-c]THIAIVZOLE; SYNTHESIS AND PERIPHERAL CYCLOADDITION REACTION
Authors: Tsuge Otohiko , Kanemasa Shuji , Hamamoto Takayoshi
Published: July 2006

A novel tetravalent sulfur compound, 1,3,6-triphenylimidazo[ 1,2-c]thialvzole, was synthesized, which reacted with N-(p-tolyl)maleimide as both an azomethine ylide and a thiocarbonyl ylide 1,3-dipole yielding four 1:1 adducts that contained each endo and exo isomers. The cycloadducts of azomethine ylide were found to isomerize into those of thiocarbonyl ylide through a retro 1,3-dipolar cycloaddition reaction. It was offered that this nitrogen-bridged tetravalent sulfur compound was to be designated as a bi-perifunctional compound.
RECOGNITION OF THE AMINOACYL-tRNA-SYNTHETASE BY THE COGNATE U SHAPED tRNA AND ITS RELATION TO THE GENETIC CODE
Authors: Shimizu Mikio
Published: July 2006

The U shaped tRNA can fit to the cognate aminoacyl-tRNA-synthetase, by making a covalent adduct of its uracil at position 8 to the C-terminal half of the synthetase. Then the complex of three anitcodon bases with a discriminator base (C4N, complex of four nucleotides) comes over the Rossmann fold of the synthetase and many features concerning with the genetic code can be explained, including the membrane transport of the amino acids by the help of the uncharged cognate tRNAs.
IMMOBILIZATION OF ENZYME BY PLASMA-INITIATED POLYMERIZATION
Authors: Osada Yoshihito , Iino Yasuhiro , Iriyama Yu
Published: July 2006

Invertase was immobilized by the plasma-initiated polymerization, exposing the glow-discharge plasma for 60–90 sec onto the aqueous vinyl monomers, followed by the postpolymerization at room temperature. Obtained enzymes in the pellet and the film exhibited high activities for a long period of time without any leakage of the enzyme.
LATTICE PARAMETERS AND ELECTRICAL CONDUCTIVITY IN Li2O DOPED ZnO
Authors: Miyayama Masaru , Takuma Yasuhisa , Yanagida Hiroaki
Published: July 2006

Lattice parameters, electrical conductivity and optical absorption for Li2O doped ZnO were examined as a function of Li2O content. As the Li2O content increased, both c-axis dimension and conductivity decreased initially reaching the minima at the Li2O content of 0.05∼0.1 mol% and later increased. These results can be interpreted such that the incorporation of Li took place at substitutional sites for low Li2O content and at both interstitial and substitutional sites for more than 0.05mol% Li2O.
FORMATION OF A Mg(II)–O2− ADDUCT FROM THE REACTION OF Mg(II) ION WITH SUPEROXIDE ION, O2−, IN ACETONITRILE
Authors: Ozawa Toshihiko , Hanaki Akira
Published: July 2006

Superoxide ion, O2−, generated by the electrolytic reduction of molecular oxygen in acetonitrile associates with Mg(II) ion to form the Mg(II)–O2− complex. The formation of adduct was verified by ESR spectrometry.
RHODIUM(II) ACETATE: AN EFFECTIVE HOMOGENEOUS CATALYST FOR SELECTIVE ALLYLIC OXIDATION AND CARBON–CARBON BOND FISSION OF OLEFINS
Authors: Uemura Sakae , Patil Suresh R
Published: July 2006

Treatment of some cyclic olefins and allylbenzene with Rh2(OAc)4 in acetic acid in the presence of t-BuOOH gave the corresponding enones and allylic acetates, the former being predominant. Application to several styrene derivatives resulted in a selective C=C bond fission to give benzaldehyde or acetophenone. It is suggested that the reaction proceeds catalytically with Rh(II) acetate via an ionic pathway.
ASYMMETRIC SYNTHESIS OF α-AMINO ACIDS BY NONENZYMATIC TRANSAMINATION. VERSATILITY OF THE REACTION AND ENANTIOMERIC EXCESSES OF THE PRODUCTS
Authors: Tachibana Yoji , Ando Makoto , Kuzuhara Hiroyoshi
Published: July 2006

Diverse α-keto acids were transformed into the corresponding α-amino acids with enantiomeric excesses ranging from 60 to 96% by the reaction with chiral pyridoxamine analog, (R)- or (S)-15-aminomethyl-14-hydroxy-5,5-dimethyl-2,8-dithia [9] (2,5)pyridinophane (4), and Zn2+ in the molar ratio of 2:1, in methanol. The use of the S enantiomer of 4 gave (R)-α-amino acids, and vice versa.
ASYMMETRIC SYNTHESIS OF α-AMINO ACIDS BY NONENZYMATIC TRANSAMINATION. RATIONALIZATION FOR THE STEREOCHEMICAL RESULTS
Authors: Tachibana Yoji , Ando Makoto , Kuzuhara Hiroyoshi
Published: July 2006

Asymmetric induction in the nonenzymatic transamination from the chiral pyridoxamine analog (1) to the α-keto acids in the presence of a limited amount of zinc ion can be explained by the kinetically controlled stereoselective protonation to the carbanion formed in an octahedral Zn2+ chelate intermediate during the reaction.
REACTIONS OF BENZYNE WITH SULFIDES HAVING A CARBOXYL GROUP. A NOVEL SYNTHESIS OF ESTER AND LACTONE
Authors: Nakayama Juzo , Fujita Toko , Hoshino Masamatsu
Published: July 2006

Reactions of benzyne with o- and p-(alkylthio)benzoic acids afford alkyl o- and p-(phenylthio)benzoates in varied yields, while reaction with o-(phenylthio)methylbenzoic acid gives phthalide and diphenyl sulfide in good yields.