bluuebunny/crossref_metadata_2025 huggingface dataset:
REACTION OF COBALOXIME(I), WITH 2-ALLYLOXYETHYL HALIDES. EVIDENCE FOR AN ELECTRON TRANSFER MECHANISM
Authors: Tada Masaru , Okabe Masami
Published: July 2006

Reaction of Cobaloxime(I), (CoI)− , with 2-allyloxyethyl halides (1, 2, and 3) gave cyclized organocobaloximes (5) formed by intramolecular rearrangement of 2-allyloxyethyl radicals to (3-tetrahydrofuranyl)methyl radicals. The intermediate radical must be formed by an electron transfer process which competes with an SN2 reaction to give a non-cyclized organocobaloximes.
A KINETIC STUDY ON THE PROTON-TRANSFER REACTIONS OF m- AND p-NITROPHENYLAZOSALICYLIC ACIDS COUPLED WITH INCLUSION REACTIONS WITH β-CYCLODEXTRIN IN AQUEOUS SOLUTIONS
Authors: Yoshida Noboru , Fujimoto Masatoshi
Published: July 2006

A kinetic study on the proton-transfer reactions of the title compounds coupled with inclusion reactions with β-cyclodextrin in aqueous solutions is carried out by means of a temperature-jump method. The forward rate constants for the inclusion reactions are in the order of magnitude 106 mol−1 dm3 s−1. The rate constants for the recombination of the title compounds with OH− ion increase in the concentrations of β-cyclodextrin.
REACTION OF 1-SUBSTITUTED INDOLES WITH CARBOXYLIC ACIDS AND N-IODOSUCCINIMIDE
Authors: Kwon Sundo , Kuroki Nobuhiko
Published: July 2006

1-Substituted indoles reacted with carboxylic acids and N-iodosuccinimide to give 1-substituted-2,3-diacyloxyindolines in significant yields.
LIQUID PHASE CO-AMMONOLYSIS OF PHENOL AND CYCLOHEXANOL WITH PALLADIUM-ON-CARBON CATALYST
Authors: Hamada Hideaki , Yamamoto Makoto , Matsuzaki Takehiko , Wakabayashi Katsuhiko
Published: July 2006

In the presence of Pd/C catalyst, phenol and cyclohexanol are aminated simultaneously to aniline and cyclohexylamine by ammonolysis, while conversion of phenol or cyclohexanol alone is very poor. It is suggested that this amiantion is caused by hydrogen transfer between phenol and cyclohexanol. Ru/C, Rh/C, and Pt/C are ineffective for this co-amination.
HEXAAMMINECOBALT(III)-HYDROGEN ION-EXCHANGE ON CRYSTALLINE ZIRCONIUM PHOSPHATE
Authors: Hasegawa Yoshitsugu , Kizaki Seiichi
Published: July 2006

The ion-exchange reaction was studied by the batch method at 75 °C. The reaction proceeded in the pH region of 3–6. The analysis of the exchanged solid showed that Co(NH3)63+ exchanged with the protons in the exchanger, and that two phases, the cobalt complex form and α-zirconium phosphate, were present in the solid.
REACTIONS OF 9-NITROANTHRACENE WITH THIOLS IN LIQUID AMMONIA
Authors: Takikawa Yuji , Abe Toshihiko , Sato Ryu , Takizawa Saburo
Published: July 2006

Anthrylsulfides were obtained in high yields in the reactions of 9-nitroanthracene 1 with thiols. The reactions with thiolates resulted in the formation of aci-9,9′-dinitro-10,10′-dihydro-10,10′-bianthryl 2 via a 9-nitroanthracene anion radical.
AZETIDINE-2,4-DIONES VIA PHOTOCYCLIZATION OF N-FORMYL-N-METHYL α,β-UNSATURATED AMIDES
Authors: Maruyama Kazuhiro , Ishitoku Takeshi , Kubo Yasuo
Published: July 2006

Upon irradiation N-formyl-N-methylcyclohexene-1-carboxamide (2a) cyclized to give N-methylcyclohexane-l,1-dicarboximide (3a) in a high yield. The reaction proceeds via intramolecular hydrogen abstraction. Similarly, several other alkyl-substituted azetidine-2,4-diones were synthesized.
A SIMPLE, HIGHLY VERSATILE SYNTHESIS OF CYCLOPROPYL PHENYL SULFIDES
Authors: Tanaka Kazuhiko , Uneme Hideki , Matsui Syuichi , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

1,3-Bis(phenylthio)propane reacted readily with 2–2.2 equiv. of n-butyllithium in THF at 0°C to afford 1-lithiocyclopropyl phenyl sulfide. Treatment of the substituted 1,3-bis(phenylthio)propanes with 1.1 equiv. of n-butyllithium afforded the corresponding cyclopropanes in good yields.
TRACE CHARACTERIZATION OF THE FLUORESCENT SUBSTANCES OF A DINOFLAGELLATE, NOCTILUCA MILIARIS
Authors: Inoue Shoji , Okada Kunisuke , Tanino Hideo , Kakoi Hisae , Goto Toshio
Published: July 2006

Two fluorescent substances isolated from Noctiluca miliaris were identified as harman and norharman which were first examples isolated from marine sources.
A NEW SYNTHESIS OF WATASENIA PRELUCIFERIN BY CYCLIZATION OF 2-AMINO-3-BENZYL-5-(p-HYDROXYPHENYL)PYRAZINE WITH p-HYDROXYPHENYLPYRUVIC ACID
Authors: Inoue Shoji , Okada Kunisuke , Tanino Hideo , Kakoi Hisae
Published: July 2006

The reaction of 2-amino-3-benzyl-5-(p-hydroxyphenyl)pyrazine with p-hydroxyphenylpyruvic acid gave directly Watasenia preluciferin in a satisfactory yield without any reductive treatment.
SOLVENT EFFECT ON CARBONYL 13C HYPERFINE SPLITTING OF FREE ANION RADICAL OF 9-FLUORENONE: A MEASURE FOR ANION SOLVATION POWER OF APROTIC SOLVENTS
Authors: Nakamura Kazuo
Published: July 2006

The carbonyl 13C splitting of the free anion radical of 9-fluorenone was examined with eight solvents including pyridine to exhibit a large solvent dependence: 3.20 gauss in dimethylsulfoxide to 1.76 gauss in hexamethylphosphoric amide. A linear relationship between Gutmann’s acceptor number (AN) and 13C splitting (ac), as expressed by ac=0.16 AN + 0.06 (gauss), was found.
EXTRINSIC PHOTOCONDUCTION IN METALLOPORPHYRIN FILMS
Authors: Yamashita Kazuo , Maenobe Kuniharu , Fajer Jack
Published: July 2006

The dc photoconductance in films of metalloporphyrins has been explained by a mechanism which involves singlet exciton states followed by the interaction of these excitons with aluminum and surface impurity sites. The defect model of exponential trap distribution is useful to interpret the sublinear light dependence of the photocurrent, which is difficult to understand on the basis of exciton mechanism.
HETEROCONJUGATE ADDITION OF LITHIUM ALKYLS TO SUBSTITUTED HETERO-OLEFINS CONJUGATED WITH SULFUR AND SILICON ATOMS
Authors: Isobe Minoru , Kitamura Masato , Goto Toshio
Published: July 2006

Lithium alkyls and a lithiated sulfone carbanion readily added to the substituted hetero-olefins conjugated with silicon and sulfonesulfur atoms among other combination of the third (or fourth) row hetero atoms, e.g. Si, Se and S.
BROUSSONINS A AND B, NEW PHYTOALEXINS FROM DISEASED PAPER MULBERRY
Authors: Takasugi Mitsuo , Anetai Masaki , Masamune Tadashi , Shirata Akira , Takahashi Kokichi
Published: July 2006

Isolation and structure elucidation of two phytoalexins (1 and 2), produced by diseased paper mulberry and designated as broussonins A and B, are described. These phytoalexins are characterized structurally by a 1,3-diphenylpropane skeleton.
(4+2) TYPE CYCLOADDITIONS OF CYCLOHEPTATRIENYLIDENE TO ANTHRACENE AND 1,3-DIPHENYLISOBENZOFURAN
Authors: Saito Katsuhiro , Omura Yoichi , Mukai Toshio
Published: July 2006

Addition reactions of cycloheptatrienylidene (1) with anthracene (2) and 1,3-diphenylisobenzofuran (3) gave (4+2) type adducts (4, 5, and 6) and a heptafulvene derivative (7). The reaction mechanisms for these cycloadditions are described.
THE TRANS-MEMBRANE ELECTRON TRANSPORT COUPLED WITH DYE REDOX CYCLE IN THE LIPOSOME SYSTEM
Authors: Sudo Yukio , Kawashima Takanori , Toda Fujio
Published: July 2006

The trans-membrane electron transport reaction was studied in the single wall liposome system in the presence of various redox dyes both in the irradiated and non-irradiated system. The reaction proceed through the steps coupled with the dye redox cycle, and was completely controlled by the redox property of dye.
SULFONAMIDES. A NEW CLASS OF CHELATING AGENTS OF POTENTIAL UTILITY IN ANALYTICAL AND SEPARATION CHEMISTRY
Authors: Takagi Makoto , Omori Takashi , Matsuo Shuji , Matsuno Shugo , Ueno Keihei , Ide Shunsuke
Published: July 2006

New sulfonamide chelating agents were synthesized, and the complexation behavior was studied by solvent extraction method. The metal selectivity is strikingly different from the conventional solvent extraction agents. The outlook of this class of reagents in analytical and separation chemistry is discussed.
UPFIELD SHIFT OF CMR OF ANOMERIC CARBONS OF 1,1′-LINKED GLYCOPYRANOSYL GLYCOPYRANOSIDES
Authors: Koto Shinkiti , Inada Shigeru , Zen Shonosuke
Published: July 2006

Unusual upfield shifts are observed in CMR of anomeric carbons of α,α- and β,β-forms of 1,1′-linked d-glycopyranosyl d-glycopyranosides. On the contrary, α,β-forms of 1,1′-linked d-glycopyranosyl l-glycopyranosides show such upfield shifts. Possible cause of upfield shift is postulated in relation to the conformation of the glycoside linkage of 1,1′-linked glycopyranosyl glycopyranosides.
CONCERTED FRAGMENTATION CONCURRENT WITH A STEPWISE-DIRADICAL FISSION IN THE OXETANE THERMOLYSIS; IMPORTANCE OF STERIC STRAIN
Authors: Imai Toshiro , Nishida Shinya
Published: July 2006

Thermolytic behavior of 3-alkyl-2-phenyloxetanes, in particular that of trans isomers, is best explained by concurrent concerted fragmentation and stepwise diradical fission. Proportion of the concerted process should be small in the cis isomers because of destabilization of the transition state by steric strain. The argument is supported by the thermal behavior of 3-alkyl-4-phenyl-2-oxetanones.
FORMATION OF COLEON A SKELETON FROM (−)-ABIETIC ACID
Authors: Matsumoto Takashi , Imai Sachihiko , Ondo Kenji , Takeyama Nobuaki , Fukui Kenji
Published: July 2006

By the treatment of Δ6-6-hydroxy-5βH-dehydroabietic acid (18–6)-lactone with potassium hydrogensulfate or conc. sulfuric acid, the B ring aromatization and the C1–C10 bond cleavage occurred to give 1,10-secoabietane derivatives possessing coleon A skeleton.
PHOTOCHEMICAL AND THERMAL INTERCONVERSIONS OF THREE DIMERS OF 2,4,5-TRIPHENYLIMIDAZOLYL (LOPHYL)
Authors: Goto Toshio , Tanino Hideo , Kondo Tadao
Published: July 2006

Two photochromic lophyl dimers, A and B, are interconverted by uv irradiation, while these two dimers and thermochromic dimer C can be equilibrated in benzene at 100°C. Compositions at equilibrium using the corresponding three dimers of 2-(p-tolyl)-4,5-diphenylimidazolyl are A:B = 96:4 and A:B:C = 14:18:68, respectively.
DIRECT SYNTHESIS OF N-ARYL BENZAMIDES BY REDUCTIVE CARBONYLATION OF NITROARENES CATALYZED BY RHODIUM CARBONYLS IN BENZENE
Authors: Mise Takaya , Hong Pangbu , Yamazaki Hiroshi
Published: July 2006

The reactions of nitroarenes, carbon monoxide, and benzene in the presence of Rh4(CO)12 or Rh6(CO)16 give N-aryl benzamides via the reductive carbonylation of nitroarenes and subsequent addition of benzene to the resulting aryl isocyanates.
OXIDATIVE DEGRADATION OF β- AND γ-AMINO ACIDS BY CONTACT GLOW DISCHARGE ELECTROLYSIS
Authors: Harada Kaoru , Terasawa Jun-ichi
Published: July 2006

The degradation of β- and γ-amino acids in aqueous solutions by contact glow discharge electrolysis(CGDE) was studied. It was found that the reaction is actually a stepwise oxidative degradation by hydroxyl radical produced by CGDE.
SYNTHESES OF (±)-CINNAMODIAL AND (±)-CINNAMOSMOLIDE
Authors: Naito Takanobu , Nakata Tadashi , Akita Hiroyuki , Oishi Takeshi
Published: July 2006

Syntheses of (±)-cinnamodial and (±)-cinnamosmolide were achieved starting from the intermediate used in the synthesis of (±)-warburganal.
FIVE-COORDINATED COMPLEXES CONTAINING AN OPTICALLY ACTIVE LIGAND
Authors: Ohtani Yukiye , Utsuno Shunji
Published: July 2006

Copper(II), nickel(II), and cobalt(II) complexes containing (+)546-2-[bis(dimethylaminoethyl)amino]-1-propanol were prepared. The CD spectra of these complexes in nitromethane were measured between 10000–26000 cm−1.
ENHANCED QUANTUM EFFICIENCY OF THE SENSITIZED PHOTOCURRENT OF ZnO ELECTRODE BY THE J-AGGREGATE OF CYANINE DYES
Authors: Hada Hiroshi , Yonezawa Yoshiro , Inaba Hiroo
Published: July 2006

Sensitized photocurrent spectra of ZnO electrode show distinct peaks at the J-band of the two cyanine dyes, 1,1′-diethyl-2, 2′-quinocyanine chloride(dye I) and 3,3′-dimethyl-9-phenyl-4,5,4′,5′-naphthothiacarbocyanine chloride(dye II). Quantum efficiencies of the anodic photocurrent by dye I and the cathodic photocurrent by dye II have high values of about 1.0 under suitable conditions.
ENANTIOMER DIFFERENTIATION IN THE PHOTOINDUCED 1,5-PHENYL SHIFT OF 3-METHYL-3-PHENYL-2(3H)-OXEPINONE UTILIZING CHIRAL SENSITIZERS
Authors: Hoshi Nobuto , Furukawa Yûichi , Hagiwara Hisahiro , Uda Hisashi , Sato Kazuhiro
Published: July 2006

Enantiomer differentiation has been observed in the initial 1,5-phenyl shift of the sensitized photorearrangement of racemic 3-methyl-3-phenyl-2(3H)-oxepinone with chiral N-(1-phenylethyl)naphthalenecarboxamides leading to optically active 4-methyl-7-exo-phenyl-2-oxabicyclo[4.1.0]hept-4-en-3-one.
MESOMORPHIC PROPERTIES OF SOME CHOLESTERYL ARYLBENZOATES
Authors: Koden Mitsuhiro , Takenaka Shunsuke , Kusabayashi Shigekazu
Published: July 2006

Cholesteryl esters of 4-benzoyl-, 4-phenoxy-,4-thiophenyl,4-benzyl-, 3-benzoyl-,3-benzylbenzoic acids were prepared. The thermal stability of the cholesteric mesophase is largely dependent on the molecular geometry and the electronic nature of the linkage, and decreases by the order of –CO–>–O–>–S–>–CH2–.
THE REACTION OF ALKYLCYCLOHEXANONES WITH COPPER(II) BROMIDE AND 1,2-GLYCOLS
Authors: Haruta A Mitsuhiro , Satoh J Yasuo
Published: July 2006

Alkylcyclohexanones react with copper(II) bromide and 1,2-glycols to give alkyl-substituted 2,3-dihydro-1,4-benzodioxin and 1,4,5,8-tetraoxa[4,4,4]propellane derivatives.
OXYGEN REDUCTION ON GLASSY CARBON ELECTRODE MODIFIED BY POLYMER AND COBALT PHTHALOCYANINE
Authors: Kikuchi Takeyuki , Sasaki Hideo , Toshima Shinobu
Published: July 2006

Catalytic activities and the lifetime of chemically modified glassy carbon electrode by polystyrene(PS) and cobalt phthalocyanine(CoPC) were investigated in the reduction of oxygen by the measurements of current-potential curves in 6N KOH aqueous solutions. The PS coated electrode behaved in the same manner as the glassy carbon electrode without treatment (GCE), without any obvious current decrease and potential shift of the wave. The electrode coated with the PS containing the CoPC showed higher catalytic activities than the GCE during a long continuous operation, which had a longer life than the electrodes on which the CoPC was directly attached by the adsorption or the chemical modification.
SYNTHESIS OF 3′- OR 4′-ALKENYLBENZOCROWN ETHERS
Authors: Kikukawa Kiyoshi , Takamura Shinji , Hirayama Hiroshi , Namiki Hiroshi , Wada Fumio , Matsuda Tsutomu
Published: July 2006

Palladium(0) catalyzed alkenylation of 3′- or 4′-iodo- (or bromo-) benzocrown ethers are found to be a convenient procedure for the introduction of alkenyl groups (–CH=CH–R; R=Ph, COOEt and COOH). Iodination at 3′-position of benzocrown ethers could be achieved in good yield by the use of 4′-t-butyl derivatives.
EFFECT OF GUEST CATIONS ON THE PHOTO-SOLVOLYSIS OF 4′-(l-ACETOXY)ETHYLBENZO-15-CROWN-5
Authors: Suzuki Atsushi , Tada Masaru
Published: July 2006

Photo-solvolysis of 4′-(l-acetoxy)ethylbenzo-15-crown-5 (1) in methanol is depressed by the complex formation of the crown ether moiety with alkali metal ions. This effect is accounted for by the destabilization of excited state of 1 and benzyl cation from 1.
TWO NEW SESQUITERPENE ALCOHOLS CONTAINING BROMINE FROM THE MARINE ALGA, LAURENCIA NIPPONICA YAMADA
Authors: Suzuki Teruaki
Published: July 2006

Two new sesquiterpene alcohols containing Br were isolated from the marine red alga, L. nipponica Yamada (Rhodomelaceae, Urasozo in Japanese). The structures of these compounds were elucidated with their spectroscopic evidence and chemical transformations.
A HIGHLY SELECTIVE AND RAPID SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF IRON(II) WITH 4-(2-THIAZOLYLAZO)RESORCINOL
Authors: Ueda Kazumasa , Yamamoto Yoshikazu
Published: July 2006

4-(2-Thiazolylazo)resorcinol reacts sensitively with iron(II) to form a water-soluble brown complex, which spectrally has the selective absorption at 730 nm. The absorbance is constant at pH 8.9 to 10.3 and Beer’s law holds up to 120 μg of iron(II). Many ions can be tolerable, especially 3d type metals. This method is comparable to that of 1,10-phenanthroline.
A CONVENIENT ROUTE TO SYMMETRIC 1,1-DIALKYLETHENES FROM 1,2-DIMETHOXYETHENYLLITHIUM AND TRIALKYLBORANES
Authors: Yogo Toshinobu , Suzuki Akira
Published: July 2006

1,1-Dialkylethenes are prepared from 1,2-dimethoxyethenyllithium and organoboranes by treatment with trichloroacetic acid and then with sodium acetate-acetic anhydride and TiCl4/Ti(OPri)4.
X-RAY PHOTOELECTRON SPECTROSCOPIC STUDY OF THE SURFACE OF CARBON DOPED WITH POTASSIUM CARBONATE
Authors: Yokoyama Shin-ya , Tanaka Ken-ichi , Toyoshima Isamu , Miyahara Koshiro , Yoshida Kiyohide , Tashiro Jo
Published: July 2006

The X-ray photoelectron spectra of K and O peaks of the carbon impregnated with potassium carbonate were dramatically decreased by evacuation at 650 °C. When oxygen was introduced onto this surface, remarkable growth of these peaks was observed at room temperature, however, in case of contact with carbon dioxide, temperature as high as 650 °C was required to cause the same effect. These results support the reaction mechanism of a redox cycle of catalyst for the reduction of carbon dioxide with carbon.
DYNAMIC NMR AS A NONDESTRUCTIVE METHOD FOR THE DETERMINATION OF RATES OF DISSOCIATION. SCOPE OF THE METHOD AS APPLIED TO THE IONIC DISSOCIATION OF α-CHLORODIBENZYL SULFIDE
Authors: Oki Michinori , Shimizu Atsushi , Kihara Hiroshi , Nakamura Nobuo
Published: July 2006

Dynamic NMR technique was applied to the determination of the rates of ionic dissociation of α-chlorodibenzyl sulfide in chloroform-d. Total line shape analysis afforded ΔH≠ 28 kJ mol−1 and ΔS≠ −120 J K−1 mol−1 which were not dependent on the concentration of the substrate. The results imply that the initial steps of SNl reactions can be studied by the method. Scope of the method is discussed.
ON THE REVERSIBILITY OF METAL CARBENE FORMATION PROCESS IN OLEFIN METATHESIS REACTION OVER MoOx /β-TiO2 CATALYST
Authors: Tanaka Katsumi , Miyahara Koshiro , Tanaka Ken-ichi
Published: July 2006

Co-isomerization of d0- and d8-cis-2-butene was carried out on a novel catalyst, MoOx/β-TiO2(2.9>x>2.3), which is active for olefin metathesis reaction without inter- and intra-molecular hydrogen scrambling of olefins. The ratio, d4/(d0+d8), in produced trans-2-butene was found to be zero at the initial stage of the reaction, indicating a type of cis–trans isomerization by intra-molecular metathesis.
PREPARATION AND REACTIONS OF NEW DIOXYGEN BRIDGED COMPLEXES OF PALLADIUM
Authors: Chung Pyoung Jin , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tuneo
Published: July 2006

New dioxygen bridged complexes of palladium were prepared by the anion exchange reaction using superoxide ion as dioxygen source. Dioxygen is coordinated as O22− in the complexes and reacts with alcohols, acids and various active methylene compounds to give the corresponding palladium complexes and hydrogen peroxide.
STRUCTURE OF TYRIVERDIN, THE IMMEDIATE PRECURSOR OF TYRIAN PURPLE
Authors: Fujise Yutaka , Mlwa Katsuyuki , Itô Shô
Published: July 2006

Stereoisomeric tyriverdins A and B were isolated from Thais clavigera. The former, which is identical with tyriverdin isolated by Baker, was confirmed by 13C-NMR spectrum to be 2,2′-bis(methylthio)-6,6′-dibromo-2,2′-diindoxyl . None of these compounds are detected in the gastropod, suggesting that they are formed during the isolation process probably from tyrindoxyl sulfate, a genuine constituent.
PHOTOCYCLOADDITION OF 6-CYANOPHENANTHRIDINE TO ELECTRON-RICH OLEFINS
Authors: Futamura Shigeru , Ohta Hiroyuki , Kamiya Yoshio
Published: July 2006

Irradiations of 6-cyanophenanthridine in the presence of electron-rich olefins afforded the corresponding azocine and azetidine derivatives regiospecifically via their exciplex intermediates.
ELECTROLYTIC PREPARATION OF TETRAALKYLAMMONIUM BROMITES FROM THE CORRESPONDING BROMIDES
Authors: Kageyama Toshifumi , Yamamoto Tamotsu
Published: July 2006

Electrolytic oxidation of tetraalkylammonium bromides to give the corresponding bromites was found. This method is convenient and applicable to the preparation of the stable tetraalkylammonium bromites.
THE TRIPLET GEOMETRY OF BENZIL
Authors: Inoue Hiroyasu , Mori Tsunehisa , Sakurai Tadamitsu
Published: July 2006

Benzil shows dual phosphorescence in an ethylene glycol glass at 77 K. The short-lived phosphorescence at 504 nm is assigned to near-planar transoid geometry. Evidence indicates that the long-lived one appearing three maxima at 402 nm, 427 nm, and 460 nm is due to medium imposed near-planar cisoid geometry.
THE FORMATION OF α- AND β-ALANINE BY THE INSERTION OF NH(1Δ) RADICALS INTO THE C-H BONDS OF PROPIONIC ACID
Authors: Sato Shin , Kitamura Takashi , Tsunashima Shigeru
Published: July 2006

The formation of α- and β-alanine in the photolysis of hydrogen azide in propionic acid was confirmed by the NMR spectra. The yield ratios, alanine/nitrogen and β/α in alanine were found to be 0.4 and 1.5, respectively, suggesting that NH(1Δ) radicals insert into the C–H bonds of propionic acid.
A NEW METHOD FOR CONFORMATIONAL ANALYSIS OF PEPTIDES BY HYDROGEN–CHLORINE REPLACEMENT REACTION
Authors: Kondo Michio , Okamoto Kouji , Nishi Ichiro , Yamamoto Makoto , Kato Tetsuo , Izumiya Nobuo
Published: July 2006

Replacement reaction of peptide NH with chlorine was applied to the peptide antibiotics, gramicidin S and tuberactinamine N. The rate of chlorination followed by NMR spectra demonstrates that the hydrogen-bonded peptide NH in the molecule is much more susceptible to chlorination than the solvent-exposed peptide NH.
ORIENTATION OF CARBOXYLATION REACTION BY CONTACT GLOW DISCHARGE ELECTROLYSIS
Authors: Terasawa Jun-ichi , Harada Kaoru
Published: July 2006

The carboxylation reaction of aliphatic amines and cyclic imines in aqueous formic acid by contact glow discharge electrolysis (CGDE) was studied and the orientation of the carboxylation reaction was investigated. It was found that the orientation of the reaction was controlled by the effect of the charged and uncharged nitrogen atom.
CN-COMPOUNDS FORMATION OVER Al2O3 SUPPORTED Pt AND Rh CATALYSTS IN THE REDUCTION OF NO WITH PROPYLENE AND H2–CO
Authors: Mizuno Koichi , Kamuki Toru , Suzuki Masaomi
Published: July 2006

Large amounts of hydrogen cyanide (HCN), acetonitrile, acrylonitrile, and propionitrile were formed in the reduction of NO with propylene and H2–CO over Al2O3 supported Pt and Rh catalysts. Rh was more active in both the reduction of NO and the formation of HCN and nitriles than Pt. Propylene employed as a reducing agent was more reactive in the conversion of NO into HCN than H2–CO.
HIGH-PERFORMANCE LIQUID CHROMATOGRAPHIC DETERMINATION OF OPTICALLY ACTIVE AND RACEMIC EPHEDRINES BY DERIVATIZATION AND METAL CHELATES FORMATION
Authors: Moriyasu Masataka , Hashimoto Yohei , Endo Masaru
Published: July 2006

Nickel chelate of dithiocarbamate derived from d or l-ephedrine gave one peak in high-performance liquid chromatography while that from racemic ephedrine gave two peaks, the same one and additional one. By measurement of areas of these peaks, optically active and racemic ephedrines were determined.
MODIFICATION OF E. COLI ASPARAGINASE WITH 2,4-BIS(O-METHOXYPOLYETHYLENE GLYCOL)-6-CHLORO-S-TRIAZINE(ACTIVATED PEG2); DISAPPEARANCE OF BINDING ABILITY TOWARDS ANTI-SERUM AND RETENTION OF ENZYMIC ACTIVITY
Authors: Matsushima Ayako , Nishimura Hiroyuki , Ashihara Yoshihiro , Yokota Yoshihiro , Inada Yuji
Published: July 2006

Asparaginase from E. coli was modified with activated PEG2 which was synthesized from monomethoxypolyethylene glycol and cyanuric chloride. The PEG2-modified asparaginase had no binding ability towards anti-asparaginase serum but retained 11% of the enzymic activity(GOT method) of the native asparaginase.
SYNTHESIS OF METHYL 2,3-DI-O-METHYL-α-d-SIBIROSAMINIDE
Authors: Yoshimura Juji , Hong Namgi , Rahman Atta ur , Sato Ken-ichi
Published: July 2006

Methyl 2,3-di-o-methyl-α-d-sibirosaminide (12; methyl 4,6-dideoxy-3-c-methyl-2,3-di-o-methyl-4-methylamino-α-d-altropyranoside) has been synthesized from methyl 4,6-o-benzylidene-3-c-methyl-2-o-methyl-α-d-altropyranoside (2). The introduction of methylamino group at c-4 position was achieved by hydrogenation of methyl 6-deoxy-3-c-methyl-2,3-di-o-methyl-α-d-arabino-hexopyranosid-4-ulose oxime (8) in the ratio of 2.6:1 (altro:ido) followed by N-formylation and reduction.
SYNTHESIS OF 2H-PYRIDO[l′,2′:1,6]PYRIDO[2,3-d]PYRIMIDINE-2,4(3H)DIONES (“BENT 5-DEAZAFLAVINS”) AND THEIR USE IN OXIDATION OF ALCOHOL AND AMINE
Authors: Yoneda Fumio , Ono Masami , Kira Keiko , Tanaka Hisako , Sakuma Yoshiharu , Koshiro Akira
Published: July 2006

Treatment of 6-chloro-5-formyluracils with 2-benzylpyridines in dimethylformamide gave the corresponding 2H-pyrido[1′,2′:1,6]pyrido[2,3-d.]pyrimidine-2 ,4(3H)diones which are a bent type of 5-deazaflavin. Similarly, treatment of 6-chloro-5-formyl-3-methyluracil with 2-aminopyridine gave a 6-azalog of the above bent 5-deazaflavin, 2H-pyrido-[2′,1′:2,3]pyrimido[4,5-d]pyrimidine-2,4(3H)dione. These “bent 5-deazaflavins” showed oxidizing ability toward benzyl alcohol, cyclohexanol and benzylamine giving the corresponding carbonyl compounds.
SYNTHETIC STUDIES ON ASATONE-TYPE NEOLIGNANS OXIDATION OF 4-ALLYLPHENOLS WITH THALLIUM (III) NITRATE
Authors: Niwa Masatake , Noda Hitoshi , Kobayashi Hiroki , Yamamura Shosuke
Published: July 2006

Oxidation of 4-allylphenols in MeOH has been carried out using thallium (III) nitrate to give two different types of reaction product. In the cases of 4-allylphenols with an electron-donating group (MeO), methoxylation takes place on the aromatic ring resulting in the formation of asatone-type compound as well as of 2,5-cyclohexadien-1-one. In the case of 4-allyl-2-methoxy-6-nitrophenol, however, the allyl group was attacked by the reagent to give three phenols.
ONE-POT PHOTOCHEMICAL SYNTHESIS OF 4-ARYLNAPHTHO[2,3-d][1,3]DIOXEPIN-6,11-DIONE
Authors: Maruyama Kazuhiro , Tojo Masahiro , Matsumoto Kiyoshi , Otsuki Tetsuo
Published: July 2006

4-Arylnaphtho[2,3-d][1,3]dioxepin-6,11-dione was synthesized from 2-alkoxy-3-bromo-1,4-naphthoquinone and 1-aryl-l-trimethylsilyloxyethylene by a one-pot photochemical reaction.
THE PREPARATION OF OXIME ETHERS UNDER PHASE TRANSFER CONDITION
Authors: Shinozaki Hiraku , Yoshida Noyuki , Tajima Moritaka
Published: July 2006

O-Butyloximes, O-allyloximes, O-2-chloroethyloximes, and O,O′-methylenedioximes were prepared from the corresponding oximes and halides under the phase transfer condition using sodium hydroxide and tetrabutylammonium bromide.
NEW SYNTHESIS OF ISOQUINOLINE ALKALOIDS, THALIFOLINE, CORYPALLINE, AND CHERYLLINE
Authors: Irie Hiroshi , Shiina Ayako , Fushimi Tamaki , Katakawa Jun’ichi , Fujii Nobutaka , Yajima Haruaki
Published: July 2006

Isoquinoline alkaloids, thalifoline, corypalline, and cherylline, were synthesised by application of the cyclisation reaction of β-phenylethyl isocyanate to N-methylisoquinoline lactam with Magic Methyl and the regioselective cleavage reaction of aromatic methoxyl groups with methionine and methanesulphonic acid.
CYCLOADDITIONS OF 2-ARYLMETHYLENE-1-TETRALINTHIONES WITH ISOPRENE AND (E,E)-1,4-DIPHENYL-1,3-BUTADIENE
Authors: Karakasa Takayuki , Motoki Shinichi
Published: July 2006

2-Arylmethylene-1-tetralinthione reacted with isoprene and (E,E)-1,4-diphenyl-1,3-butadiene to give the 3,4-dihydro-2H-thiopyran derivatives. In these reactions, the thiones and dienes are formally acting as 4π- and 2π-electron components, respectively.
ELECTRODE REACTION OF EDTA AT LEAD DIOXIDE ELECTRODE IN AQUEOUS SOLUTIONS OF DIFFERENT pH
Authors: Fujinaga Taitiro , Yoshimura Tadayosi
Published: July 2006

Ethylenediaminetetraacetic acid (EDTA) at lead dioxide (PbO2) electrode gives two anodic waves and one cathodic wave in the pH range 4∼9 (one anodic wave and one cathodic wave at pH lower than 4). The anodic main-wave and the cathodic wave increase with the EDTA concentration. The anodic pre-wave appears only at pH higher than 4.
CN RADICAL PRODUCED IN THE INFRARED MULTIPHOTON DISSOCIATION OF ACRYLONITRILE
Authors: Kubota Satoshi , Udagawa Yasuo
Published: July 2006

Internal states of CN produced in the IR multiphoton dissociation of acrylonitrile have been studied by laser induced fluorescence and by luminescence. The temporal behavior of the fluorescence and the pressure dependence of the rotational temperature suggest the participation of collisions under the apparent collision free condition.
STEREOSELECTIVE PHOTOCYCLOADDITION OF EPOXYNAPHTHOQUINONES TO ALLYL ALCOHOLS
Authors: Maruyama Kazuhiro , Osuka Atsuhiro , Suzuki Hitomi
Published: July 2006

Irradiation of a benzene solution of 2, 3-disubstituted epoxynaphthoquinones and allyl alcohols gave tetracyclic hemiketals 6.
DEFLUORINATIVE COUPLING REACTIONS OF gem-DIFLUOROOLEFINS WITH ORGANOLITHIUM REAGENTS. NOVEL, FACILE METHODS FOR CHAIN ELONGATIONS OF ALDEHYDES LEADING TO AMIDES, ACETYLENES, AND KETONES
Authors: Hayashi Sei-ichi , Nakai Takeshi , Ishikawa Nobuo
Published: July 2006

Three types of coupling reactions of gem-difluoroolefins derived easily from aldehydes with lithium reagents (R′Li and R′2NLi) are described which constitute the facile procedures for conversions of aldehydes (RCHO) to amides (RCH2CONR′2), acetylenes (R–C≡C–R′), and ketones (RCH2COR′).
THE FIRST ISOLATION AND CHARACTERIZATION OF FREE PHENYLAMIDOSULFURIC ACID AND ITS RING-SUBSTITUTED DERIVATIVES. POSTULATED INTERMEDIATES IN THE SULFONATION OF AROMATIC AMINES
Authors: Kanetani Fujio
Published: July 2006

Thirteen free arylamidosulfuric acids were prepared and charactrized for the first time. These acids could readily been obtained in a pure state simply by adding concentrated hydrochloric acid to a cold aqueous solution of the corresponding ammonium salts. These compounds are non-hygroscopic, crystalline solids and quite stable at room temperature under anhydrous conditions. The spectral data clearly showed that all the arylamidosulfuric acids exist as zwitterions, ArNH2+–SO3−, in the solid state.
CRYSTAL SYMMETRY CHANGE OF ZSM-5 BY VARIOUS TREATMENTS
Authors: Nakamoto Hiromi , Takahashi Hiroshi
Published: July 2006

When a SiO2/Al2O3 ratio was higher than about 170, the crystal structure of ZSM-5 changed from orthorhombic to monoclinic symmetry by mere calcination. The monoclinic symmetry remained unchanged by NH4-ion exchange, but the symmetry was reformed to orthorhombic in some of the specimens by protonation. The SiO2/Al2O3 ratio was found to play a major role compared with the Na-content.
A NEW METHOD FOR DETERMINATION OF INTACT OPTICAL PURITY OF PEPTIDES BY USE OF MASS FRAGMENTOGRAPHY
Authors: Kusumoto Shoichi , Matsukura Masayuki , Shiba Tetsuo
Published: July 2006

A novel method was established for the determination of true optical purity of amino acid residues in peptides. Hydrolysis in deuterium chloride followed by mass fragmentographic detection enables very accurate analysis without disturbance by racemization in the hydrolysis procedure.
PHOTOCHEMICAL RING OPENING PATHS OF AZIRINE–AN AB INITIO GVB ENERGY GRADIENT APPROACH
Authors: Kato Shigeki , Morokuma Keiji
Published: July 2006

The energy gradient method with the ab initio GVB wavefunction has been used to trace reaction paths of the photochemical ring opening of azirine. All the geometrical parameters have been optimized as functions of the CNC angle for the four low-lying electronic states. Based on the results, a new reaction mechanism has been suggested.
SYNTHESIS OF A NEW BINUCLEAR COPPER(II) COMPLEX WITH 1,4-BIS [N,N-BIS(3-SALICYLIDENEAMINOPROPYL)AMINOMETHYL]BENZENE AND ITS CATALYTIC ACTIVITY FOR THE OXIDATION OF N,N,N′,N′-TETRA-METHYL-1,4-DIAMINOBENZENE BY DIOXYGEN
Authors: Oishi Naoyasu , Nishida Yuzo , Kida Sigeo
Published: July 2006

A new binuclear copper(II) complex with 1,4-bis[N,N-bis(3-salicylideneaminopropyl)aminomethyl]benzene was prepared and characterized. This complex showed catalytic activity for the oxidation of N,N,N′,N′-tetramethyl-1,4-diaminobenzene by dioxygen in contrast to the inertness of the component mononuclear complex.
HETEROGENEOUS PHOTOCATALYTIC OXIDATION OF AROMATIC COMPOUNDS ON SEMICONDUCTOR MATERIALS: THE PHOTO-FENTON TYPE REACTION
Authors: Fujihira Masamichi , Satoh Yoshiharu , Osa Tetsuo
Published: July 2006

Heterogeneous photocatalytic oxidation of aromatic compounds by H2O2 formed from dissolved O2 in the presence of illuminated TiO2 powders was investigated with reference to the Fenton reaction. All the products expected from the Fenton reaction were obtained. The effect of other semiconductor materials and Fe2+ on the reaction was also investigated.
THE RUTHENIUM COMPLEX CATALYZED REDUCTIVE TRANSFORMATION OF NITROBENZENE. A NOVEL ROUTE TO 2,3-DIALKYLQUINOLINES AND N-ALKYLANILINES USING SATURATED ALCOHOLS
Authors: Watanabe Yoshihisa , Tsuji Yasushi , Suzuki Naoki
Published: July 2006

Nitrobenzene reacts with saturated alcohols in the presence of a catalytic amount of ruthenium complex at 180°C to give 2,3-dialkylquinolines and N-alkylanilines in good yields. The reaction appears to include reduction of nitrobenzene with the alcohols by hydrogen transfer reaction.
HIGHLY POLARIZED TROPONES. 9H-AZULENO[1,2,3-ij]NAPHTHALEN-9-ONE AND 8H-AZULENO[1,2,3-ij]NAPHTHALEN-8-ONE
Authors: Yamamoto Kagetoshi , Matsue Yuji , Murata Ichiro
Published: July 2006

9H-Azuleno[l,2,3-ij]naphthalen-9-one (3a) and 8H-Azuleno [1,2 , 3-ij]naphthalen-8-one (3b), consisting of tropone and acenaphthylene have been synthesized. These ketones were found to be highly polarized and highly basic compounds.
SYNERGISTIC EFFECT OF TRIOCTYLPHOSPHINE OXIDE AND DIBENZO-18-CROWN-6 ON THE EXTRACTION OF SILVER(I) AS PICRATE
Authors: Hasegawa Yuko , Suzuki Koji , Sekine Tatsuya
Published: July 2006

Solvent extraction of silver(I) with dihenzo-18-crown-6 (E) as ion-pairs with picrate ion (A−) into chloroform was found to be synergistically enhanced by trioctylphosphine oxide (TOPO). This was concluded to be due to an adduct formation of the cationic silver(I) complex with TOPO, AgE(topo)2+, in this organic solvent.
THE STRUCTURES OF BOTH THE KINETIC AND THE THERMODYNAMIC ISOMERS OF 1,4,8,11-TETRAAZACYCLOTETRADECANESILVER(II) PERCHLORATE AS DETERMINED BY X-RAY ANALYSES
Authors: Ito Tasuku , Ito Haruko , Toriumi Koshiro
Published: July 2006

The title compound obtained initially from the reaction mixture has a basket type configuration, but successive slow recrystallizations from weakly acidic aqueous solution resulted in structural isomerization to a thermodynamically more stable structure.
HIGH-PRESSURE SYNTHESIS AND CHARACTERIZATION OF EUROPIUM(II) METASILICATE, EuSiO3
Authors: Machida Ken-ichi , Adachi Gin-ya , Shiokawa Jiro , Shimada Masahiko , Koizumi Mitsue , Suito Kaichi , Onodera Akifumi
Published: July 2006

The high-pressure polymorphism of EuSiO3 was studied up to a pressure of 80 kb at 1000–1400°C. Two high-pressure phases were obtained in addition to the atmospheric one: α-EuSiO3 was transformed into δ and δ′ forms at about 60 and 70 kb, respectively. Their crystal data were determined by means of X-ray diffraction analyses.
ONE STEP SYNTHESIS OF α-AMINOALKYLFURANS AND ITS APPLICATION TO A FACILE SYNTHESIS OF PYRIDOXINE (VITAMIN B6)
Authors: Shono Tatsuya , Matsumura Yoshihiro , Tsubata Kenji , Takata Jiro
Published: July 2006

One step synthesis of α-aminoalkylfurans was achieved by the reaction of α-methoxyurethanes or α-methoxyamides with furan. This method was applied to an efficient synthesis of pyridoxine.
FACILE SYNTHESIS OF BENZYL KETONES BY THE REDUCTIVE COUPLING OF BENZYL BROMIDE AND ACYL CHLORIDES IN THE PRESENCE OF A PALLADIUM CATALYST AND ZINC POWDER
Authors: Sato Toshio , Naruse Kouichi , Enokiya Masashi , Fujisawa Tamotsu
Published: July 2006

Benzyl ketones were obtained in good yields from benzyl bromide and acyl chlorides by the combined use of Zn and a palladium catalyst under mild conditions.
N-ALKYLATION OF AMIDES AND N-HETEROCYCLES WITH POTASSIUM FLUORIDE ON ALUMINA
Authors: Yamawaki Junko , Ando Takashi , Hanafusa Terukiyo
Published: July 2006

Alumina coated with potassium fluoride promotes smooth N-alkylation of carboxamides, lactams, and other N-heterocycles with alkyl halides or dialkyl sulfate under mild conditions.
SYNTHESES OF SOME POLYMERIC DYES AND SENSITIZED PHOTOELECTRODE PROCESSES BY THE POLYMER-COATED ELECTRODES
Authors: Morishima Yotaro , Isono Masanao , Itoh Yoshihiro , Nozakura Shun-ichi
Published: July 2006

Merocyanine (Mc) and rhodamine B (Rh) were incorporated into polyethylenimine (PEI) and poly(vinyl alcohol) (PVA) by using diethylphosphoryl cyanide or 1-methyl-2-chloropyridinium iodide as the coupling reagents. Under the illumination of visible light, SnO2 OTE (Optically Transparent Electrode) coated with PEI-Rh film exhibited remarkable spectrally sensitized photocurrent, and Pt electrodes coated with PVA-Mc and PEI-Mc films showed photocathodic currents.
SYNTHESIS AND VALENCE BOND ISOMERIZATION OF CYCLOOCTA[d]TROPOLONE
Authors: Oda Mitsunori , Morita Noboru , Asao Toyonobu
Published: July 2006

Cycloocta[d]tropolone (4) was synthesized by hydrolysis of an adduct of 1H-cyclopentacyclooctene and dichloroketene. The tropolone was found to exist as a mixture of valence bond isomers (4a) and (4b).
ACTIVATION OF POLYHALOALKANES BY PALLADIUM CATALYST. PALLADIUM CATALYZED OXIDATION OF ALCOHOLS TO CARBONYL COMPOUNDS WITH CARBON TETRACHLORIDE
Authors: Nagashima Hideo , Tsuji Jiro
Published: July 2006

Pd(OAc)2 and PdCl2 are good catalyst for the oxidation of alcohols to carbonyl compounds with CCl4, in the presence of bases. Primary and secondary alcohols are oxidized to esters and ketones in high yields, respectively.
SYNTHESES OF SOME NEW LIGANDS CONTAINING IMIDAZOLES AND REVERSIBLE OXYGENATION OF THE COBALT(II) COMPLEXES
Authors: Takano Shigeru , Yano Yumihiko , Tagaki Waichiro
Published: July 2006

Tri, tetra, and pentadentate ligands containing imidazole groups were prepared and the oxygenation of their cobalt(II) complexes was briefly investigated.
A NEW ALDOL REACTION: A METHOD FOR THE GENERATION OF VINYLOXYBORANES BY THE ACYLATION OF BORON-STABILIZED CARBANIONS
Authors: Mukaiyama Teruaki , Murakami Masahiro , Oriyama Takeshi , Yamaguchi Masahiko
Published: July 2006

Phenyl-substituted vinyloxyboranes are generated by the acylation of boron-stabilized carbanions with methyl benzoate. Vinyloxyboranes thus generated further react with aldehydes to give the corresponding cross-aldols in good yields.
NOVEL REACTIONS OF BENZOTHIAZOLIUM N-PHENACYLIDE WITH METHYLENECYCLOPROPENES
Authors: Tsuge Otohiko , Shimoharada Hiroshi , Noguchi Michihiko
Published: July 2006

Benzothiazolium N-phenacylide reacted with methylenecyclopropenes having an acyl group on the 4-position to give 3a,11a-dihydro-5aH-furo[3′,2′:2,3]pyrido[6,1-b]benzothiazole derivative via an intermediary 3-butadienylbenzothiazolium betaine. The reaction of the ylide with a methylenecyclopropene bearing two cyano groups on the 4-position in THF gave a cyclobutane together with benzothiazole, whereas a 3-butadienyl-2-ethoxybenzothiazoline derivative was obtained in the reaction in EtOH.
DETERMINATION OF THE REARRANGEMENT ENERGY BY USING TUNNEL ELECTRODE
Authors: Kobayashi Kenkichiro , Aikawa Yoshihiro , Sukigara Mitsunori
Published: July 2006

An expression of the potential dependence of cathodic current at an n-type semiconductor tunnel electrode is derived. By applying a tunnel electrode, the rearrangement energy can be determined without ambiguity from the plot of the transfer coefficient against electrode potential.
NEW 1,3-DIPOLAR CYCLOADDITION LEADING TO 2,5-DIHYDROPYRROLE AND PYRROLIDINE DERIVATIVES
Authors: Achiwa Kazuo , Sekiya Minoru
Published: July 2006

A novel 1,3-cycloaddition of intermediaries derived from N-(benzylidene)trimethylsilylmethylamine and acyl chlorides to conjugated olefins and acetylenes gave pyrrolidine and 2,5-dihydropyrrole derivatives, respectively.
NEW ZINC PROMOTED SYNTHETIC REACTION OF γ-BUTYROLACTONE DERIVATIVES
Authors: Shono Tatsuya , Hamaguchi Hiroshi , Nishiguchi Ikuzo , Sasaki Manji , Miyamoto Tetsuya , Miyamoto Masatoshi , Fujita Shumei
Published: July 2006

Some γ-butyrolactone derivatives have been synthesized by the reaction of dimethyl maleate with carbonyl compounds in the presence of active zinc compound.
THE STRUCTURES OF DITERPENE GLYCOSIDES, SHIKOKIASIDE A AND B
Authors: Isobe Takahiko , Noda Yukinao , Shibata Kozo , Kubota Takashi
Published: July 2006

The structures of two new diterpene glycosides, shikokiaside A and B, isolated from Rabdosia shikokiana var shikokiana were elucidated, respectively, by chemical and spectroscopic data.
MERCURY- AND CADMIUM-PHOTOSENSITIZED REACTIONS OF γ-BUTYROLACTONE
Authors: Yamamoto Shunzo , Matsuda Shuzo , Ozaki Chihiro , Nishimura Norio
Published: July 2006

The mercury- and cadmium-photosensitized reactions of γ-butyrolactone have been studied. The gaseous products obtained in the mercury-photosensitized reaction were carbon dioxide, cyclopropane, and propylene. On the other hand, the products obtained in the cadmium-photosensitized reaction were carbon monoxide and ethylene.
ONE-POT SYNTHESIS OF α-FLUORO-α,β-UNSATURATED ESTERS FROM CHLOROMALONIC ESTER AND CARBONYL COMPOUNDS USING “SPRAY-DRIED” POTASSIUM FLUORIDE
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

α-Fluoro-α,β-unsaturated esters were prepared by one-pot reaction between aldehydes or ketones and diethyl chloromalonate in the “spray-dried” potassium fluoride–sulfolane system.
RE-EXAMINATION ON BROMINATION OF SUBSTITUTED BIPHENYLENES. FORMATION OF BENZOCYCLOOCTATETRAENE DERIVATIVES
Authors: Kidokoro Hiroto , Sato Masaru , Ebine Seiji
Published: July 2006

The bromination products of 2-methoxy- and 2-acetamido-3-bromobiphenylenes were not the biphenyl derivatives (3a) and (3b), which were previously assigned by McOmie et al,, but the benzocyclooctatetraene derivatives (2a) and (2b), respectively.
THE CONCEPT OF “SURFACE-TRAPPED HOLE” AS AN INTERMEDIATE OF ANODIC REACTION OF A GALLIUM PHOSPHIDE SEMICONDUCTOR ELECTRODE
Authors: Nakato Yoshihiro , Tsumura Akira , Tsubomura Hiroshi
Published: July 2006

The concept of “surface-trapped hole”, acting as a precursor in various photoanodic processes, is proposed on the experimental basis of the surface band energy and electroluminescence of GaP in contact with redox solutions.
HIGHLY ACTIVE Ag/C ELECTRODE FOR OXYGEN DEPOLARIZED CHLOR-ALKALI ELECTROLYTIC CELL
Authors: Miura Norio , Gomyo Kazuyuki , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

The polytetrafluoroethylene-bonded carbon electrode on which silver was loaded by “ion exchange method” gave 300 mA/cm2 at −0.12 V (vs. Hg/HgO) for the reduction of oxygen in 9 mol/dm3 NaOH at 80 °C, and it may be useful for the oxygen depolarized chlor-alkali electrolytic cell. The high activity of the electrode was found to come from the fine dispersion of silver and the oxidation-treatment of carbon surface.
TWO NEW PYRONES, METABOLITES OF PENICILLIUM CITREO-VIRIDE BIOURGE
Authors: Niwa Masatake , Endo Tetsuji , Ogiso Shigeki , Furukawa Hideyuki , Yamamura Shosuke
Published: July 2006

Two new pyrones, citreoviridinol and secocitreoviridin, have been isolated from the yellow rice, and their structures also been elucidated on the basis of their spectral data.
SYNTHETIC UTILITY OF A FLUORINE-FACILITATED CLAISEN REARRANGEMENT: A NOVEL SYNTHETIC METHOD FOR 2,4-ALKADIENOIC ACIDS USING 2,2,2-TRIFLUOROETHYL PHENYL SULFOXIDE
Authors: Nakai Takeshi , Tanaka Kiyoshi , Ogasawara Kyo , Ishikawa Nobuo
Published: July 2006

A novel synthetic method for 2,4-alkadienoic acids from allylic alcohols and 2,2,2-trifluoroethyl phenyl sulfoxide is described which involves the in situ Claisen rearrangement facilitated by the fluorine. This method was applied to the stereocontrolled synthesis of pellitorine, a natural insecticide.
β-LACTAM AS SYNTHETIC INTERMEDIATE: SYNTHESIS OF LEUCINE-ENKEPHALIN
Authors: Hatanaka Naoto , Abe Rumiko , Ojima Iwao
Published: July 2006

A method for oligopeptide synthesis via β-lactam intermediate has been successfully applied to the synthesis of a biologically active pentapeptide, leucine-enkephalin.
SYNTHESIS OF NdAl3(BO3)4 CRYSTALS FROM HIGH-TEMPERATURE SOLUTIONS
Authors: Tate Isao , Oishi Shuji
Published: July 2006

By slow cooling method NdAl3(BO3)4 crystals were grown from the high-temperature solutions of the five-component system Nd2O3–Al2O3–B2O3–K2CO3–MoO3 where Nd2O3 and B2O3 were contained in excess of the stoichiometric composition. The grown crystal with hexagonal rod shape were up to 6x1x1 mm in size, bluish purple in color and transparent.
NEW PHOTOMETRIC REAGENTS FOR ALKALI METAL IONS BASED ON CROWN ETHER COMPLEX FORMATION
Authors: Nakamura Hiroshi , Sakka Hideo , Takagi Makoto , Ueno Keihei
Published: July 2006

Two chromogenic crown ethers, N-(2-hydroxy-5-nitrobenzyl)-aza-15-crown-5(1) and N-(2-hydroxy-5-nitrobenzyl)-aza-18-crown-6(2), were synthesized for the extraction photometry of alkali metal ions. The extraction selectivity followed the order: 1, Li+>Na+>K+>>Rb+, Cs+ and 2, K+>Na+>Rb+>Li+>Cs+. 1 is useful for determining 10–100 ppm Li+ as well as for concentrating Li+ from a dilute solution.
TEMPERATURE PROGRAMMED DESORPTION OF CARBON MONOXIDE ADSORBED ON MAGNESIUM OXIDE
Authors: Hattori Hideshi , Imai Hisaya , Itoh Hidenobu
Published: July 2006

The nature of adsorbed CO on MgO was investigated by temperature programmed desorption technique. Magnesium oxide outgassed at 500°C gave one desorption peak at 190°C while MgO outgassed at 1000°C gave two distinctive desorption peaks at 185°C and 300°C. Carbon-13 labeled study indicates that two types of the adsorbed species on MgO outgassed at 1000°C do not exchange each other.
ELECTROPHILIC ADDITION REACTIONS TO PHENYLACETYLENE CATALYZED BY HETEROPOLY ACID
Authors: Matsuo Kazuhiro , Urabe Kazuo , Izumi Yusuke
Published: July 2006

Heteropoly acid efficiently catalyzed the addition reactions of water and carboxylic acid to phenylacetylene to form acetophenone at 60°C in the liquid phase. The higher catalytic activity of heteropoly acid compared with H2SO4 and HClO4 is due to the cooperative action of heteropoly anion.
A SIMPLE AND CONVENIENT METHOD FOR PREPARING DI-t-BUTYLSILANES
Authors: Watanabe Hamao , Ohkawa Tadashi , Muraoka Tsutomu , Nagai Yoichiro
Published: July 2006

Silicon functional di-t-butylsilanes such as (t-Bu)2SiCl2, (t-Bu)2Si(OMe)2 and (t-Bu)2SiH(OMe) were conveniently obtained in good yields via di-t-butylsilane, (t-Bu)2SiH2, which can readily be prepared from the reaction of dichlorosilane, H2SiCl2, with t-butyllithium.
ABSOLUTE CONFIGURATIONS OF QUERCUS LACTONES, (3S,4R)- AND (3S,4S)-3-METHYL-4-OCTANOLIDE, FROM OAK WOOD AND CHIROPTICAL PROPERTIES OF MONO-CYCLIC γ-LACTONES
Authors: Masuda Masahiro , Nishimura Ki-i-chi
Published: July 2006

Absolute configurations of Quercus lactones were investigated by studying paramagnetic shifts of PMR spectra and the chemical correlation with 2-hydroxyhexanoic acid of known configuration. Chiroptical properties of several mono-cyclic γ-lactones were also studied.
INTRAMOLECULAR ANIONIC CYCLIZATIONS OF o-CINNAMYLOXY- AND o-PHENYLPROPARGYLOXYBENZYLIDENEAMINES
Authors: Tsuge Otohiko , Ueno Kazunori , Oe Koji
Published: July 2006

The intramolecular anionic cyclization of o-cinnamyloxybenzylideneamines proceeded via an allyl anion and/or an azaallyl anion to give a mixture of 2,3-dihydrobenzofurans and/or a perhydropyrro[3,2-c]benzopyrane. In a similar reaction o-phenylpropargyloxybenzylideneamines gave 2,3-dihydrobenzofurans and/or a benzooxepine derivative exclusively via a propargyl anion. It was revealed that the relative yields of the products were dependent on the nature of amines in imines.
REGIO- AND STEREOCONTROLLED SYNTHESIS OF ALLYLIC p-TOLYL SULFONES CATALYZED BY PALLADIUM (0) COMPLEX
Authors: Inomata Katsuhiko , Yamamoto Taku , Kotake Hiroshi
Published: July 2006

The reaction of allyl esters with sodium p-tolylsulfinate in tetrahydrofuran and methanol catalyzed by Pd(PPh3)4 gave the regio- and stereocontrolled allylic p-tolyl sulfones in good yields at room or lower temperature.
Pd(II)-CATALYZED 1,3-ALKYL MIGRATION OF 1-ALKENYL ETHYL ACETALS. PREPARATION OF α-ALKYLATED (E)-α,β-UNSATURATED CARBONYL COMPOUNDS
Authors: Takahashi Mitsuru , Ishii Norio , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Palladium(II) complexes, such as (CH3CN)2PdCl2 and (diene)PdCl2, catalyze 1,3-alkyl migration of 1-alkenyl ethyl acetals and subsequent elimination of ethanol to give α-alkylated (E)-α,β-unsaturated carbonyl compounds in excellent yields.