bluuebunny/crossref_metadata_2025_split huggingface dataset:
DIFFERENCE BETWEEN INFRARED MULTIPHOTON AND THERMAL REACTIONS OF HClC=CClH AND HClC=CCl2
Authors: Katayama Mikio , Mizugai Yoshihiro 
Published: July 2006

Abstract
The differences of mechanisms between the reaction induced by infrared multiphoton dissociation and pyrolysis are elucidated in the cases of 1,2-dichloroethylene and trichloroethylene. The interpretation presented here may be applied in the reactions of many molecules.
ASYMMETRIC SULFENYLATION OF KETONES WITH CHIRAL SULFENAMIDES
Authors: Hiroi Kunio , Nishida Michihisa , Nakayama Atsuko , Nakazawa Kumiko , Fujii Eiko , Sato Shuko 
Published: July 2006

Abstract
Asymmetric sulfenylations of 4-alkylcyclohexanones (6a,b) with chiral sulfenamides (1–5) were achieved in the presence of a catalytic amount of triethylamine hydrochloride to give 4-alkyl-2-phenylthiocyclohexanones (7a,b), which were transformed into optically active 4-alkyl-2-phenylthiocyclohexenes (10a,b) and 3-alkylcyclohexanones (11a,b) in fairly good chemical and optical yields. The influences of chiral sulfenamides and the reaction conditions on this asymmetric induction are described.
ELECTRON SPIN RESONANCE STUDIES ON THE CYCLOPENTADIENYL RADICALS. ON THE 13C HYPERFINE COUPLING CONSTANT AND SUBSTITUENT EFFECTS BY DEUTERIUM AND ALKYL GROUPS
Authors: Kira Mitsuo , Watanabe Mieko , Sakurai Hideki 
Published: July 2006

Abstract
ESR spectra of parent and six substituted cyclopentadienyl radicals (R–C5H4·; R=H, D, Me, Et, iso-pr, t-Bu, Me3SiCH2), generated from the corresponding R–C5H4–SnMe3 by an SH2 attack on Sn with the photochemically generated t-butoxy radical, are recorded and discussed.
MOLECULAR STRUCTURE OF AQUAETHYLENEDIAMINETETRAACETATOOSMIUM(IV) MONOHYDRATE: [Os (edta) (H2O)]·H2O
Authors: Saito Masami , Uehiro Takashi , Ebina Fujio , Iwamoto Toschitake , Ouchi Akira , Yoshino Yukichi 
Published: July 2006

Abstract
The title complex, obtained as the first characterized solid Os(IV)-edta complex, crystallizes in the monoclinic space group P21/a with a=14.956(7), b=8.181(3), c=14.600(7) Å, β=126.64(3)°, and Z=4. In the complex molecule [Os(edta)(H2O)], the seven-coordinate Os(IV) sits in a monocapped trigonal prism formed with two N and four O atoms of sexidentate edta and with an O atom of H2O.
SYNTHETIC CONTROL BY INTERNAL HYDROGEN BONDING. THE INTRAMOLECULAR DIELS–ALDER REACTION OF NITROFURAN AND α,β-UNSATURATED CARBOXAMIDES
Authors: Mukaiyama Teruaki , Takebayashi Toyonori 
Published: July 2006

Abstract
The intramolecular Diels–Alder reaction of N-(5-nitrofurfuryl)-N-(2-hydroxyphenyl) α,β-unsaturated carboxamides gives good yields of cycloadducts when internal hydrogen bonding is present.
PARTIAL ASYMMETRIC SYNTHESIS OF ATROPISOMERIC 1,1′-BINAPHTHYLS VIA THE ULLMANN COUPLING REACTION OF CHIRAL ALCOHOL ESTERS OF 1-BROMO-2-NAPHTHOIC ACID
Authors: Miyano Sotaro , Tobita Masayuki , Suzuki Shoji , Nishikawa Yukio , Hashimoto Harukichi 
Published: July 2006

Abstract
The Ullmann coupling of 1-bromo-2-naphthoates of C-chiral alcohols of R- and S-configuration induced axial dissymmetry of R- and S-chirality, respectively, in the newly formed 1,1′-bond of the binaphthyls; the optical yield amounted up to 13% where the chiral alcohol was l-menthol.
NEW AND EFFICIENT SYNTHESIS OF γ-KETO ESTERS FROM NITRO OLEFINS
Authors: Miyashita Masaaki , Kumazawa Toshiaki , Yoshikoshi Akira 
Published: July 2006

Abstract
The Lewis acid-catalyzed reaction of nitro olefins and ketene methyl trimethylsilyl acetals afforded methyl 4-oxo-carboxylates on hydrolysis of the resulting adducts followed by treatment with diazomethane.
ZEEMAN EFFECT AND TEMPERATURE DEPENDENCE OF NQR IN DIETHYLTIN DIBROMIDE AND DIIODIDE
Authors: Okuda Tsutomu , Hiura Morio , Boku Ryukei , Yamada Koji , Negita Hiaso 
Published: July 2006

Abstract
The Zeeman effects have been measured for both 81Br and 127I nuclei in diethyltin dihalides and the directions of electric field gradient axes have been determined. The temperature dependences of 127I NQR lines have shown anomalous features. The results were accounted for in terms of the intermolecular bonding.
PREPARATION AND DIELS–ALDER REACTIONS OF SOME FUNCTIONALIZED ISOPRENES
Authors: Mandai Tadakatsu , Yokoyama Haruyuki , Miki Toshio , Fukuda Haruo , Kobata Hiroshi , Kawada Mikio , Otera Junzo 
Published: July 2006

Abstract
A convenient synthetic method for some functionalized isoprenes employing 1-bromo-2-phenylthioethane and ethyl acetoacetate as starting materials is reported. It has also been found that the dienes thus obtained gave functionalized limonene analogs by Diels–Alder reaction with methyl vinyl ketone.
A NEW STEREOSELECTIVE SYNTHESIS OF A TERPENOID DIOL COMPONENT OF THE PHEROMONAL SECRETION OF THE QUEEN BUTTERFLY
Authors: Masaki Yukio , Sakuma Kazuhiko , Kaji Kenji 
Published: July 2006

Abstract
A terpenoid diol component of the pheromonal secretion of the queen butterfly was synthesized stereoselectively from geraniol by means of a site-specific terminal olefin functionalization and the subsequent anionic [2,3]-sigmatropic rearrangement of carbomethoxymethyl allylic sulfide.
CATALYTIC REDUCTION OF CO2 TO CO USING SULFUR VAPOR AS A REDUCING REAGENT
Authors: Ueno Akifumi , Sato Toshio , Todo Naoyuki , Kotera Yoshihide , Takasaki Seiji 
Published: July 2006

Abstract
The catalytic reduction of CO2 to CO by sulfur vapor was studied at the temperatures higher than 650°C over various metal oxides and sulfides, and on the basis of the results from the kinetic studies and the X-ray diffraction measurements, the reaction scheme was tentatively proposed as follows:
metal oxides + S2(g) → metal sulfides + SO2
metal sulfides + CO2 → metal oxides + CO + SO2.
ASYMMETRIC INDUCTION IN THE [2,3] SIGMATROPIC REARRANGEMENT VIA CHIRAL AMMONIUM YLIDES
Authors: Hiroi Kunio , Nakazawa Kumiko 
Published: July 2006

Abstract
The asymmetric [2,3] sigmatropic rearrangements of the chiral ammonium chlorides (E)-(3a,b) were achieved upon treatment with t-BuOK followed by acidic hydrolysis of the aminonitriles (5a,b) obtained to give (R)-(+)-2-methyl-2-phenyl-3-butenal (6). The rearrangement of (E)-(3a) at −78° resulted in the highest optical yield (90%) of (R)-(+)-(6). The geometrical isomer (Z)-(3a) underwent the same [2,3] shift under the same conditions to afford (S)-(−)-(6). The mechanism of this asymmetric induction is discussed based on these results.
CHELATOMETRIC DETERMINATION OF RHODIUM(III) USING WATER-ETHANOL SOLUTIONS
Authors: Yoshino Yukichi , Hatazawa Satoshi , Saito Masami , Ouchi Akira 
Published: July 2006

Abstract
An EDTA back-titration of rhodium(III) has been proposed taking advantage of rapid chelation in water-ethanol solutions. The optimum amount of rhodium was 0.5 – 10 mg and the standard deviation was 0.76%. The method is applicable to the analysis of some rhodium(III) complexes.
NMR STUDIES ON THE INTERACTIONS OF GLYMES WITH DIMETHYLTIN DICHLORIDE IN BENZENE
Authors: Otera Junzo , Shiigi Masanobu , Kawasaki Yoshikane 
Published: July 2006

Abstract
The interactions between glymes (Gly) and dimethyltin dichloride (DMTC) have been studied by 1H NMR spectroscopy. The coexistence of the 1:2 Gly/DMTC complexes with 1:1 complexes was found for the higher members of Gly. Benzene-induced shifts of proton signals of both DMTC and Gly suggest that the complexes possess the methyl groups attached to tin essentially in a trans arrangement.
PREFERRED CONFORMATIONS OF 9-MONOSUBSTITUTED DERIVATIVES OF 8,9,10,11-TETRAHYDRO-7H-CYCLOOCTA[de]NAPHTHALENE
Authors: Kamada Toshihiro , Yamamoto Osamu 
Published: July 2006

Abstract
The conformations of 8,9,10,11-tetrahydro-7H-cycloocta[de]naphthalen-9-ol and its esters have been studied based on the NMR spectra. It was found that these compounds assume solely the equatorial-boat (eb) conformations in solution, the peri rings of which are unusually rigid as compared with the conformations previously reported.
CLEAVAGE OF PEPTIDE TO SPARROW-RESIN BOND BY CATALYTIC TRANSFER HYDROGENOLYSIS WITH 1,4-CYCLOHEXADIENE
Authors: Colombo Roberto 
Published: July 2006

Abstract
Cleavage of benzyl ester-type linkage to the Sparrow modified polystyrene support was attempted with the aid of catalytic transfer hydrogenation using 1,4-cyclohexadiene and palladium black, and satisfactory yields were obtained. This will provide an alternatively efficient and mild method for the final deblocking step during improved solid phase peptide synthesis.
ONE-POT SYNTHESIS OF (Z)-4-ALKENOIC ACIDS
Authors: Fujisawa Tamotsu , Sato Toshio , Kawara Tatsuo , Naruse Kouichi 
Published: July 2006

Abstract
The reaction of β-propiolactone with di-(Z)-1-alkenylcuprates, prepared from Grignard reagents, copper(I) iodide and acetylene, gave (Z)-4-alkenoic acids in high yields in one-pot operation.
HALOGENATION OF 2,7-DI-TERT-BUTYL-TRANS-10b,10c-DIALKYL-10b,10c-DIHYDROPYRENES
Authors: Tashiro Masashi , Yamato Takehiko 
Published: July 2006

Abstract
Treatment of 2,7-di-tert-butyl-trans-10b,10c-dialkyl-10b,10c-dihydropyrene 5a–5c with bromine afforded the corresponding tetrabromides 7a–7c in good yields, respectively. The tetrachloro derivative of 5a was also obtained in 40% yield by the treatment of 5a with SO2Cl2. The bromination of 5a–5c with bromine in the presence of Fe powder gave the dealkylated compound 2,7-di-tert-4,5,9,10-tetrabromopyrene 8 in good yields, respectively. When 5a–5c were treated with I2 2,7-di-tert-butylpyrene 9 was obtained in good yields, in all cases.
OXIDATION OF ASCORBIC ACID CATALYZED BY N,N′-ETHYLENEBIS(SALICYLIDENEAMINATO)COBALT(II)
Authors: Tsukahara Keiichi , Ushio Hiroko , Yamamoto Yasuo 
Published: July 2006

Abstract
N,N′-Ethylenebis(salicylideneaminato)cobalt(II) catalyzed the autoxidation of ascorbic acid in methanol. The kinetic evidence of a transient-oxygen complex with ascorbic acid was obtained by the measurements of the oxygen consumption in this catalytic oxidation.
REDUCTIVE COUPLING OF AROMATIC ALDEHYDES BY OCTACARBONYL DIFERRATE
Authors: Ito Keiji , Nakanishi Saburo , Otsuji Yoshio 
Published: July 2006

Abstract
The reaction of aromatic aldehydes with Fe(CO)5 or Fe3(Co)12 in pyridine gives the corresponding 1,2-diaryl-1,2-ethanediols as major products in good yields. A reactive species of this reaction is octacarbonyl diferrate [Fe2(CO)8]2−.
PHOTOCHEMICALLY INDUCED REDUCTION OF VIOLOGENS IN SOLID POLAR APROTIC POLYMER MATRICES
Authors: Kamogawa Hiroyoshi , Masui Toshiaki , Nanasawa Masato 
Published: July 2006

Abstract
Photochemically induced reversible reduction of viologens in solid polar aprotic polymer matrices proceeds much more efficiently than that in protic ones. The effects of the N-substituent and anionic part of viologens were also considerable.
LASER-PHOTOLYSIS STUDY OF THE EXTERNAL MAGNETIC FIELD EFFECT UPON THE PHOTODECOMPOSITION REACTION OF 1,3-DIPHENYL-2-PROPANONE IN A MICELLE
Authors: Hayashi Hisaharu , Sakaguchi Yoshio , Nagakura Saburo 
Published: July 2006

Abstract
The photodecomposition reaction of 1,3-diphenyl-2-propanone in a micelle was studied with the aid of ns laser-photolysis. The transient absorption due to the benzyl radical was observed and the amount of escaping benzyl radicals from radical pairs was found to be enhanced by 30 % in the presence of a magnetic field of 70 mT.
KINETIC STUDIES ON THE LABILE TERNARY NICKEL(II) CHELATES OF N-DISUBSTITUTED DITHIOCARBAMIC ACIDS BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
Authors: Moriyasu Masataka , Hashimoto Yohei 
Published: July 2006

Abstract
The labile ternary complex formed by mixing two solutions of nickel(II) dialkyldithiocarbamate solutions was separated by high-performance liquid chromatography. The equilibrium constant and rate constants of formation and disproportionation of the ternary complex were obtained.
SEPARATION OF LANTHANOIDS WITH TETRAETHYLENE GLYCOL
Authors: Hirashima Yoshiyuki , Moriwaki Yoshikazu , Shiokawa Jiro 
Published: July 2006

Abstract
The yield of the solid complex of tetraethylene glycol(EO4) with a lanthanoid(Ln) nitrate decreases with increasing atomic number of Ln, and is greatly affected by H2O present in the solution. The separation factors of EO4 are comparable to those of the separating reagents practically used.
REGULARITY OF THE OXIDIZING ACTIVITY OF Mo6+ IONS IN VARIOUS 12-HETEROPOLYMOLYBDATES
Authors: Akimoto Masamichi , Tsuchida Yoshitaka , Echigoya Etsuro 
Published: July 2006

Abstract
The oxidizing activity of Mo6+ ions in 12-heteropolymolybdates was found to correlate with the electronegativity of counter ion (H+, alkali, and alkali-earth metal ions) as well as of hetero atom (P5+, As5+, and Si4+).
NOVEL RUTHENIUM(II) OLEFIN COMPLEX WITH A COORDINATED ALICYCLIC CARBON–HYDROGEN BOND
Authors: Itoh Kenji , Oshima Noriaki 
Published: July 2006

Abstract
Chloro(η2,η2-norbornadiene) [η1,η2-3-endo-(3′-nortricyclyl)norborn-5-en-2-endo-yl]ruthenium(II), 1a, prepared by zinc reduction of [RuCl2(norbornadiene)]n in the presence of norbornadiene and suitable proton sources such as alumina or ammonium chloride in acetonitrile, involves a coordinated alicyclic carbon–hydrogen bond.
CRYSTAL GROWTH OF Na(La,Nd)(WO4)2 SOLID SOLUTION FROM HIGH-TEMPERATURE SOLUTIONS
Authors: Oishi Shuji , Tate Isao 
Published: July 2006

Abstract
Na(La,Nd)(WO4)2 solid solution crystals were grown from high-temperature solutions of La2O3–Nd2O3–WO3–Na2CO3 by slow cooling. These crystals were tetragonal, up to 4–5 mm in size, red purple and mostly transparent. The lengths of a and c axes were considered to obey Vegard’s law. This experimental result indicated that the complete series of solid solution isostructural with the end member crystals were obtained.
AMIJIDICTYOL, A NEW DITERPENOID FROM THE BROWN SEAWEED DICTYOTA LINEARIS: X-RAY CRYSTAL AND MOLECULAR STRUCTURE
Authors: Ochi Masamitsu , Watanabe Masanori , Kido Masaru , Ichikawa Yasuji , Miura Iwao , Tokoroyama Takashi 
Published: July 2006

Abstract
The structure of a new diterpenoid, amijidictyol, isolated from the brown seaweed Dictyota linearis has been determined as 4 on the basis of spectral evidence and X-ray analysis.
UNUSUAL HIGH REACTIVITIES OF 5α- AND 5β-CHOLESTAN-3-ONES IN THE HYDROGENATION CATALYZED BY PALLADIUM. EVIDENCE FOR AN ATTRACTIVE INTERACTION OF THE STEROID α-FACE WITH PALLADIUM
Authors: Nishimura Shigeo , Murai Mikio , Shiota Michio 
Published: July 2006

Abstract
5α- And 5β-cholestan-3-ones are 30 and 17 times as reactive as 4-t-butylcyclohexanone in Pd catalyzed competitive hydrogenation in t-BuOH. The high reactivity of the steroid ketones and unusual hydrogenation stereochemistry on Pd have been explained on the basis of an attractive interaction of the steroid α-face with Pd.
SYNTHESIS OF THE SULFUR ANALOG OF Δ6-PGI1
Authors: Shibasaki Masakatsu , Torisawa Yasuhiro , Ikegami Shiro 
Published: July 2006

Abstract
A synthesis of the sulfur analog of Δ6-PGI1 with potent inhibitory activity in platelet aggregation is described. The synthesis starting from the suitably protected Corey lactone includes the hydroxylation of the lactone and the novel intramolecular addition of the sulfenyl bromide.
GENERAL BASE CATALYSES BY α-CYCLODEXTRIN IN THE HYDROLYSES OF ALKYL BENZOATES
Authors: Komiyama Makoto , Hirai Hidefumi 
Published: July 2006

Abstract
The hydrolyses of seven alkyl benzoates are catalyzed by α-cyclodextrin. These results indicate that the general base catalysis by α-cyclodextrin, previously found for the first time in the hydrolysis of 2,2,2-trifluoroethyl 4-nitrobenzoate, is applicable to other alkyl esters.
ASYMMETRIC TRANSFORMATION OF AMINO ACIDS IN N-SALICYLIDENE AMINO ACYL-l-ISOLEUCINATOCOPPER(II)
Authors: Harada Kaoru , Shiono Katsuji , Nomoto Shinya 
Published: July 2006

Abstract
A new asymmetric transformation of amino acids was described. Thus, when N-salicylidene-d-alanyl-, d-phenylalanyl-, or d-phenylglycyl-l-isoleucinatocopper(II) was incubated at pH 8.5 and 80°C, the resulting mixture at equilibrium contained a complex of l-l-dipeptide in the contents of 63–76%. The epimerization of dipeptides is based on the enhanced activity of N-terminal amino acids through complex formation.
AN EFFECTIVE DEHYDROGENATION OF INDOLINES TO INDOLES WITH COBALT(II) SCHIFF’S BASE COMPLEXES
Authors: Inada Akira , Nakamura Yushin , Morita Yutaka 
Published: July 2006

Abstract
Facile dehydrogenations of indolines to indoles were performed with the catalytic amount of bis(salicylidene)ethylenediaminatocobalt(II) and bis(3-methoxysalicylidene)ethylenediaminatocobalt(II) under mild conditions in 55–92% yields.
ON THE ROTATION VERSUS THE INVERSION MECHANISM IN THE THERMAL ISOMERIZATION OF CIS-AZOBENZENES
Authors: Shinkai Seiji , Kusano Yumiko , Shigematsu Kazuyoshi , Manabe Osamu 
Published: July 2006

Abstract
The thermal cis-to-trans isomerization of an azobenzene covalently-bridged to azacrown ether occurs via the inversion mechanism, and the rotational mechanism is not allowed owing to the rigid ring structure. By using the “standard” azobenzene, it was demonstrated that the thermal isomerization of most cis-azobenzenes occurs via the inversion mechanism, the activation parameters being subject to a good ΔH\eweq–ΔS\eweq compensation relationship.
REACTION OF α-BROMO-α,β-UNSATURATED ESTERS AND BUTENOLIDES WITH MALONAMIC ESTERS
Authors: Takei Hisashi , Fukuda Yoshimasa , Sugaya Kazuhiro , Taguchi Takeo , Kawara Tatsuo 
Published: July 2006

Abstract
α-Bromo-α,β-unsaturated esters and α-bromobutenolides reacted with sodium salts of methyl malonamates to afford cyclopropanes, α-methoxycarbonyllactams and 5-amino-4-methoxycarbonyl-2,3-dihydrofurans. The last compounds could be easily converted into α-methoxycarbonyl-γ-lactones. The ratio of these compounds formed is influenced by the structures of both malonamates and unsaturated compounds, especially by the substituents at nitrogen of the malonamates, and by the reaction conditions.
MULTIPLE PATHS FOR PHOTOALKYLATION OF PYRIDINECARBOXYLIC ESTERS IN ALCOHOLS
Authors: Sugiyama Toru , Tobita Estuo , Takagi Kyoko , Sato Michitsugu , Kumagai Yasuyuki , Satô Gen P , Sugimori Akira 
Published: July 2006

Abstract
Photochemical substitution of ring hydrogen of pyridinecarboxylic esters by alkyl groups derived from solvent alcohols occurs in several paths: 1) alkylation initiated by the excited carbonyl moiety of the ester group and 2) alkylation initiated by the excitation of the π-electonic system of the pyridine ring. In the photoreaction of methyl 3-pyridinecarboxylate in acidic methanol, three types of excited state (two triplet states for alkylation and a singlet state for alkoxylation) contribute simultaneously.
ANODIC OXIDATION OF PYRONES AND RELATED COMPOUNDS
Authors: Iguchi Masanobu , Nishiyama Atsuko , Eto Hideo , Yamamura Shosuke 
Published: July 2006

Abstract
Triacetic lactone, 4-hydroxycoumarins, and kojic acid derivative were subjected to anodic oxidation in MeOH containing LiClO4 or NaCN to afford the corresponding methoxy or cyano compounds. In a basic media, however, dipyrone and dicoumarol were produced from triacetic lactone and 4-hydroxycoumarin, respectively. The formation process of 3-methoxytriacetic lactone as well as of 3-cyanotriacetic lactone is also presented.
A CONVENIENT SYNTHESIS OF ACETYLENIC KETONES FROM β-DIKETONES USING α,α-DIFLUOROALKYLAMINES AND FREEZE-DRIED POTASSIUM FLUORIDE
Authors: Kitazume Tomoya , Ishikawa Nobuo 
Published: July 2006

Abstract
α,α-Difluoroalkylamines, such as 1-diethylamino-2-chloro-1,1,2-trifluoroethane (1) and 1-diethylamino-1,1,2,3,3,3-hexafluoropropane (2), were found to be useful dehydrating agents for the synthesis of acetylenic ketones from β-diketones in the presence of freeze-dried potassium fluoride in acetonitrile.
EFFECT OF OXYGEN ON THE PHOTOSTATIONARY STATE COMPOSITION IN TRIPLET SENSITIZED ISOMERIZATION OF 3,3-DIMETHYL-1-(2-NAPHTHYL)-1-BUTENE
Authors: Arai Tatsuo , Sakuragi Hirochika , Tokumaru Katsumi 
Published: July 2006

Abstract
Photostationary state compositions and quantum yields were determined for triplet sensitized isomerization of 3,3-dimethyl-1-(2-naphthyl)-1-butene in benzene. The ratio of the trans isomer at the photostationary state increased with increasing concentration of oxygen, which, combined with the azulene effect, indicates that both of transoid and twisted triplets are quenched by oxygen.
CHEMICAL SYNTHESIS OF BISDEPHOSPHO LIPID A OF Salmonella ENDOTOXIN
Authors: Inage Masaru , Chaki Haruyuki , Kusumoto Shoichi , Shiba Tetsuo , Tai Akira , Nakahata Masaaki , Harada Tadao , Izumi Yoshiharu 
Published: July 2006

Abstract
Synthesis is described on 6-O-[2-deoxy-2-((R)-3-hydroxytetradecanoylamino)-6-O-tetradecanoyl-β-d-glucopyranosyl]-2-deoxy-2-((R)-3-hydroxytetradecanoylamino)-3,4-di-O-tetradecanoyl-d-glucopyranose which corresponds to the phosphate-less lipid A structure of Salmonella-type bacterial endotoxin.
STRUCTURE AND CHEMICAL SYNTHESIS OF ME-IQ, A POTENT MUTAGEN ISOLATED FROM BROILED FISH
Authors: Kasai Hiroshi , Yamaizumi Ziro , Wakabayashi Keiji , Nagao Minako , Sugimura Takashi , Yokoyama Shigeyuki , Miyazawa Tatsuo , Nishimura Susumu 
Published: July 2006

Abstract
Structure of a mutagenic compound (Me-IQ) isolated from broiled fish was determined to be 2-amino-3,4-dimethylimidazo[4,5-f]quinoline based on the mass-, UV- and 1H-NMR-spectra and chemical synthesis. Me-IQ showed strong mutagenic activity towards Salmonella typhimurium TA98 in the presence of S-9 mix.
VALENCE CHANGE OF COPPER IN CATALYTIC OXIDATION OF l-ASCORBIC ACID BY MOLECULAR OXYGEN
Authors: Ito Sotaro , Yamamoto Toshimasa , Tokushige Yuji 
Published: July 2006

Abstract
The copper(II) chloride-catalyzed oxidation of l-ascorbic acid (AA) by O2 was found to involve both the anaerobic oxidation of AA by copper(II) chloride and the reoxidatian steps of copper(I) chloride by O2 in the catalytic cycle, by comparing the rate of copper(II)-catalyzed oxidation of AA by O2 (RAIIO) with those of anaerobic oxidation of AA by copper(II) (RAII) and oxidation of copper(I) by O2 (RIO).
OXYGEN ADSORPTION SITES OF Fe2O3–Sb2O4 CATALYST DETERMINED BY SECONDARY ION MASS SPECTROMETRY-18O TRACER METHOD
Authors: Aso Isao , Amamoto Taro , Yamazoe Noboru , Seiyama Tetsuro 
Published: July 2006

Abstract
In an attempt to determine oxygen adsorption sites of the Fe2O3–Sb2O4 catalysts, SIMS measurements of the catalysts were performed after 18O2 preadsorption (SIMS-18O tracer method). It was clearly shown that the adsorbed oxygen was accommodated by the surface Sb ions.
TIME-AVERAGED CONFORMATIONS OF THE INCLUSION COMPLEXES OF β-CYCLODEXTRIN WITH t-BUTYLPHENOLS
Authors: Komiyama Makoto , Hirai Hidefumi 
Published: July 2006

Abstract
Time-averaged position of phenol, p-t-butylphenol or m-t-butyl phenol in the cavity of β-cyclodextrin in aqueous solution is determined by using the 1H-NMR spectroscopy. The order of the rate constants of the β-cyclodextrin-accelerated cleavages of the corresponding acetyl esters is satisfactorily interpreted in terms of the time-averaged positions of the substrates estimated from those of the phenols.
A FACILE SILYLATION OF CARBOXYLIC ACIDS WITH HEXAMETHYLDISILOXANE
Authors: Matsumoto Hideyuki , Hoshino Yoshikazu , Nakabayashi Jiro , Nakano Taichi , Nagai Yoichiro 
Published: July 2006

Abstract
It was found that, in the presence of a catalytic amount of sulfuric acid, hexamethyldisiloxane silylates carboxylic acids to give trimethylsilyl carboxylates in good yields.
SYNTHESIS AND PROPERTIES OF 2-CYCLOHEPTATRIENYLIDENE-5-DICYANOMETHYLIDENE-2,5-DIHYDROTHIOPHENE (A THIOPHENE ANALOG OF [1.6.7]QUINARENE)
Authors: Takahashi Kazuko , Takase Kahei , Sakae Toshisada 
Published: July 2006

Abstract
The title compound 2 was prepared in 7 steps starting from 2-bromo-5-(cycloheptatrienyl)thiophene. While the [1.6.7]quinarene derivative 1 can not be isolated in a monomeric solid due to easy and reversible oligomerization, the thiophene analog 2 is stable as a monomer both in solid and in solution. The responsible factors for the oligomerization reaction were discussed based on the chemical and physical properties of these quinarenes 1 and 2.