bluuebunny/crossref_metadata_2025 huggingface dataset:
EFFECT OF PH ON THE FLOCCULATION OF PHOSPHATIDYLCHOLINE VESICLE WITH TRIMETHYLAMMONIUM GLYCOL CHITOSAN IODIDE
Authors: Fujii Susumu , Kokufuta Etsuo , Furusawa Kunio
Published: July 2006

Effect of pH on the flocculation of phosphatidylcholine vesicle with trimethylammonium glycol chitosan iodide (MGCH) was investigated over the pH region of 3–12. The flocculation based on the salt-linkage formation between phosphate group on the vesicle surface and trimethylammonium group in MGCH is affected by pH of bulk-phase.
CONFORMATIONAL ANALYSIS AND ISOLATION OF THE ISOMERS OF [Co(hexaen)]3+
Authors: Yoshikawa Yuzo
Published: July 2006

The conformational analysis of the meso and two racemic isomers of [Co(hexaen)]3+ (Fig. 1) has been carried out and their energy-minimized structures have been determined. Based on these results, the isolation of the three isomers was achieved.
OXIDATION OF 5H-1,2,3-DITHIAZOLE DERIVATIVE. FORMATION OF A NEW TYPE OF THIOLSULFINATE AND ITS DECOMPOSITION INVOLVING OXYGEN MIGRATION
Authors: Inagaki Yoshio , Okazaki Renji , Inamoto Naoki
Published: July 2006

Oxidation of 5H-1,2,3-dithiazole derivative equilibrated with 2,4,6-tri-t-butyl-N-thiosulfinylaniline by m-chloroperbenzoic acid gives two kinds of thiolsulfinate type compounds. One of them undergoes thermal decomposition involving oxygen migration, and the other undergoes unusually facile retro-ene reaction.
HIGHLY ACTIVE AND LESS AMMONIA FORMING Fe2O3–CuO–Al2O3 CATALYST FOR NO–H2–CO REACTION
Authors: Nozaki Fumio , Kaneko Akira , Maruko Yoshiaki , Sodesawa Toshiaki
Published: July 2006

Fe2O3–CuO–Al2O3 catalyst of a CuO/Fe2O3 molar ratio near 0.5 showed a high activity for NO–H2–CO reaction, with a simultaneous formation of NH3 being very limited. The catalyst also exhibited a high activity for decomposition of NH3 when the reaction temperature was higher than 500°C.
REACTION OF STYRYL-TYPE BIS-DIMETHYLGLYOXIMATO(PYRIDINE) COBALT(III), STYRYL COBALOXIMES, WITH 1,3-BENZODITHIOLYLIUM TETRAFLUOROBORATE
Authors: Miura Kyo , Tada Masaru
Published: July 2006

Styryl-type cobaloximes give the coupling products, 2-styryl-1,3-benzodithioles, by the reaction with 1,3-benzodithiolylium tetrafluoroborate. The trans isomers of styryl cobaloximes are more reactive and more stereospecific than the cis isomers. A mechanism involving a CT-state and electron transfer is proposed.
31P NMR STUDIES ON THE MECHANISM OF ASYMMETRIC HYDROGENATION CATALYZED BY RHODIUM(I) COMPLEXES WITH CHIRAL PYRROLIDINODIPHOSPHINE LIGAND
Authors: Ojima Iwao , Kogure Tetsuo
Published: July 2006

The structures of rhodium(I) complexes with a chiral pyrrolidinodiphosphine, BPPM, are studied by means of 31P NMR spectroscopy. The spectra show that there are two conformational isomers without substrate. However, the complex takes a preferred conformation by the coordination of an olefinic substrate. The results are well accommodated by the “induced fit” model.
CARBOXYLATION OF DIOLS BEARING SHORT CARBON CHAINS WITH CARBON MONOXIDE IN THE PRESENCE OF HF–SbF5
Authors: Yoneda Norihiko , Takahashi Yukio , Sakai Yukio , Suzuki Akira
Published: July 2006

Diols having a small number of C-atoms are known to be not carboxylated with carbon monoxide or formic acid using strong acid (Koch–Haaf acid synthesis). However, diols with four or more C-atoms, except their vicinal derivatives, give the corresponding carboxylated products in good yields by the reaction of carbon monoxide under mild conditions in the presence of HF–SbF5.
COMPLEXOMETRIC TITRATIONS BASED ON THERMOCHROMISM
Authors: Yamada Mutsuo , Nakada Shoji , Ito Tasuku , Fujimoto Masatoshi
Published: July 2006

Based on the thermochromism observed for the metal complexes of Xylenol Orange, complexometric titrations of Co2+, Ni2+, Cu2+, and Zn2+ ions were successfully carried out in a lower pH region where the titrations at room temperature were impossible so far.
ALKYL–ALKYL COUPLING OF LITHIUM ALKYLALUMINATES AND ALKYL–ALLYL CROSS-COUPLING OF THE ALUMINATES WITH ALLYLIC HALIDES BY THE USE OF COPPER (II) ACETATE: AN APPLICATION OF THE CATALYTIC HYDROALUMINATION OF OLEFINS TO ORGANIC SYNTHESIS
Authors: Isagawa Kakuzo , Ohige Manabu , Tatsumi Kimio , Otsuji Yoshio
Published: July 2006

Lithium alkyl-1-trihydroaluminates, which are prepared by the catalytic hydroalumination of α-olefins with LiAlH4 in the presence of a catalytic amount of a titanium–aluminium complex, undergo the alkyl–alkyl coupling reaction upon treatment with copper (II) acetate. The reaction of lithium alkylaluminates with allylic halides in the presence of copper (II) acetate affords the alkyl–allyl cross-coupling products.
POTENTIOMETRIC BEHAVIOR OF AQUEOUS SOLUTIONS OF MALEIC ACID-STYRENE COPOLYMER WITH ADDED BIVALENT METAL IONS
Authors: Yamashita Fumitaka , Komatsu Tsuyoshi , Nakagawa Tsurutaro
Published: July 2006

The interaction of copoly(maleic acid-styrene), MASt, with bivalent metal ions, Mn(II), Co(II), Ni(II), Cu(II), and Zn(II), was investigated by pH titration method at 25 °C and the ionic strength of 0.1 mol/kg. The titration curves in the absence and presence of bivalent metal ions overlap in some dissociation region of the first neutralization step.
SYNTHESIS AND THE MOLECULAR STRUCTURE OF ACETATOTRICHLORO(TRIPHENYLPHOSPHINE OXIDE)TIN(IV)
Authors: Masaki Mitsuo , Matsunami Satoshi , Okimoto Kiyomi , Ueda Hideo
Published: July 2006

Acetatotrichloro(triphenylphosphine oxide)tin(IV) was synthesized by the reaction of stannic chloride, acetic acid and triphenylphosphine oxide or by the reaction of dichlorotin(IV) diacetate with tetrachlorobis(triphenylphosphine oxide)tin(IV). The structure of the complex was determined by the X-ray method. The molecule is monomeric and tin atom is six-coordinated.
REACTION AND STEREOCHEMISTRY OF 1,2,3-TRITHIANE RING
Authors: Kato Atsushi , Hashimoto Yohei , Otsuka Isoji , Nakatsu Kazumi
Published: July 2006

Oxidative desulfurization of 5-hydroxy-1,2,3-trithiane affords cis- and trans-4-hydroxy-1,2-dithiolane-1-oxide. X-Ray structure determination of 1,2,3-trithian-5-yl N-methylcarbamate reveals that the trithiane ring takes a chair conformation with S–S = 2.040(4) Å(av), S–S–S = 101.5(3)°, and S–S–C = 98.6(3)°(av), and that the side chain places in the equatorial position.
DETERMINATION OF ANTIMONY BY SUB- AND SUPER-EQUIVALENCE METHOD OF ISOTOPE DILUTION ANALYSIS
Authors: Kambara Tomihisa , Yoshioka Hiroe
Published: July 2006

Trace amount of antimony (0.45∼0.28 μg/ml) has been determined by sub- and super-equivalence method in isotope dilution analysis. Substoichiometric amount of Sb(III) was oxidized to Sb(V) by potassium dichromate and separated by BPHA (in CHCl3) extraction. It has been found that the determination can be performed within an accuracy of 2% in the wide region of acid concentration.
SYNTHESIS OF GLYCINE BY THE AMMONOLYSIS OF TETRACHLOROETHANE AND TRICHLOROETHYLENE
Authors: Inoue Masami , Enomoto Saburo
Published: July 2006

Glycine was obtained selectively by heating of tetrachloroethane with an excess amount of aqueous ammonia. Trichloroethylene which is separated as an intermediate compound in the early period of the ammonolysis also formed glycine. The yield increased by the addition of sodium carbonate and reached 54.6 mole% at 170° for 2 hr.
MESOMORPHIC PROPERTIES OF N-(4-ETHYLPYRIDINIO)-4-ALKOXYBENZAMIDATES: YLIDE AS A LIQUID CRYSTAL
Authors: Kise Hideo , Nishisaka Yasuyoshi , Asahara Teruzo , Seno Manabu
Published: July 2006

N-(4-Ethylpyridinio)-4-alkoxybenzamidates (1) were prepared and their phase transition properties were determined. The ylides with long alkoxyl groups (1, n=4–8) exhibit liquid crystallinity, while methoxy, ethoxy, and propoxy homologs are not mesomorphic.
A NEW SYNTHETIC ROUTE TO 1,1-BIS(METHYLTHIO)-1,3-BUTADIENES VIA THE [2,3]SIGMATROPIC REARRANGEMENT OF DITHIOCARBENES
Authors: Nakai Takeshi , Mikami Koichi
Published: July 2006

Thermolysis of the sodium salts of S-allyl-S′-methyldithiocarbonate tosylhydrazones (4) followed by methylation provided good yields of the corresponding 1,1-bis(methylthio)-1,3-butadiene (1) via the [2,3]sigmatropic rearrangement of the dithiocarbenes(5).
THE PREPARATION OF 4-METHYL-1,3,4,5-TETRAHYDROPYRROLO[4,3,2-de]ISOQUINOLINE AND ITS CONVERSION INTO 3,4-DISUBSTITUTED INDOLES
Authors: Somei Masanori , Hashiba Kazuhiko , Yamada Fumio , Maekawa Toshio , Kimata Toshihiko , Kaneko Chikara
Published: July 2006

Various 3,4-disubstituted indoles were prepared from 4-methyl-1,3,4,5-tetrahydropyrrolo[4,3,2-de]isoquinoline which was obtained readily by the two novel synthetic routes starting from 2-methyl-5-nitroisoquinolinium iodide.
RING ENLARGEMENT OF THE PHOTOCHEMICALLY GENERATED endo-2,3-TRIMETHYLENENORBORN-exo-2-YLCARBINYL CATION. OCCURRENCE OF A DIFFERENT REACTION PATHWAY FROM THAT IN SULFURIC ACID
Authors: Takaishi Naotake , Miyamoto Norioki , Inamoto Yoshiaki
Published: July 2006

endo-2,3-Trimethylenenorborn-exo-2-ylcarbinyl cation (1a), formed by irradiating the corresponding iodide (1) in heptane, rearranged mainly to tricyclo[6.2.1.02,6]undec-2(6)-ene (2), an entirely different product from the same cation in sulfuric acid. The difference is interpreted with the “free” character of the cation produced in a high energy, photochemical process.
SINGLET-OXYGEN REACTIONS OF 1,4-CYCLOHEXADIENE. A SYNTHETIC APPROACH TO THE BENZENE-1,4-ENDOPEROXIDE
Authors: Saito Isao , Tamoto Koji , Katsumura Akifumi , Sugiyama Hiroshi , Matsuura Teruo
Published: July 2006

Dye-sensitized photooxygenation of 1,4-diphenyl-1,4-cyclohexadiene (1) at 0 °C followed by reduction with sodium bisulfite gave 1,4-diphenyl-7-hydroxy-5,6-dioxabicyclo[2.2.2]oct-2-ene (2). Mesylation of 2 followed by treatment with potassium t-butoxide yielded p-terphenyl, accompanied with the generation of singlet oxygen.
SYNTHESIS OF E- AND Z-ISOMERS OF 3-(α-THIOETHOXYMETHYLENE)OXINDOLE: CHARACTERIZATION AND RELATIVE STABILITY OF THE TWO ISOMERS
Authors: Kaneko Chikara , Kawai Shinji , Somei Masanori
Published: July 2006

The E- and Z-isomers of 3-(α-thioethoxymethylene)oxindole have been synthesized for the first time and the verification that the E-isomer is more stable than the Z-isomer is provided experimentally.
SYNTHESIS OF CYCLOPENTABBCANOM
Authors: Nokami Junzo , Matsuura Nobuyoshi , Sueoka Tatsufumi , Eusumoto Yoshihisa , Kawada Mikio
Published: July 2006

Ring contraction by the Favorskii-type rearrangement of α-sulfonyloxycyclohexadecanone (3) gave the corresponding cyclopentadecanecarboxylic acid (5) in a good yield. The acid (5) was converted to cyclopentadecanone (7) via α-phenylthio- (or α-methylthio-)cyclopentadecanecarboxylic acid (6).
A CONVENIENT ROUTE TO 5′-MODIFIED PSEUDOISOCYTIDINES AND 2-THIOPSEUDOURIDINES
Authors: Sato Tsuneo , Watanabe Makoto , Noyori Ryoji
Published: July 2006

A stereo- and regiocontrolled synthesis of 5′-alkylated or -arylated pseudoisocytidines and 2-thiopseudouridines is described.
REACTION OF ALDEHYDES WITH 1,3-DICARBONYL COMPOUNDS IN THE PRESENCE OF POTASSIUM CARBONATE. A CONVENIENT SYNTHESIS OF α,β-UNSATURATED CARBONYL COMPOUNDS VIA DEACYLATION
Authors: Tsuboi Sadao , Uno Takaaki , Takeda Akira
Published: July 2006

Condensation of aldehydes with 1,3-dicarbonyl compounds such as 2,4-pentanedione (2), ethyl 2-chloro-3-oxobutanoate (4), 3-chloro-2,4-pentanedione (5), and α-acetyl-γ-butyrolactones, catalyzed by potassium carbonate proceeded via deacylation under mild conditions to give α,β-unsaturated ketones and esters in one step.
SYNTHESES AND PROPERTIES OF DIALKYLCYCLOPROPENYLIDENE PALLADIUM COMPLEXES
Authors: Yoshida Zen-ichi , Kamitori Yasuhiro
Published: July 2006

As the transition metal complexes of dialkylcyclopropenylidene, the palladium complexes of 2,3-di-isopropyl- and 2,3-di-t-butyl cyclopropenylidene, trans-X2-μ-X2Pd2II (C3R2)2, (1; X=Cl, 1′; X=Br), cis-(n-Bu3P)Cl2PdIIC3R2 (2), and [trans-(n-Bu3P)2ClPdIIC3R2]+ClO4− (3), have been synthesized. The 13C nmr and ir spectra of these complexes have been discussed for the structural elucidation.
A DIRECT SYNTHESIS OF MONOCARBAMIC ESTER OF 1,2-DIOL FROM CARBON DIOXIDE, EPOXIDE AND AMINE
Authors: Yoshida Yasuhiko , Inoue Shohei
Published: July 2006

Monocarbamic ester of 1,2-diol derived from the corresponding 1,2-epoxide was obtained directly in a good yield by the reaction of epoxide, carbon dioxide, and primary or secondary amine.
SOLUBILITY PHASE DIAGRAM OF BIS(ETHYLENEDIAMINE)OXALATOCOBALT(III) (1R,3S,4S,7R)-3-BROMOCAMPHOR-9-SULFONATE
Authors: Fuyuhiro Akira , Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

The solubility isotherm of a ternary system, Λ-[Co(ox)(en)2](d-C10H14OBrSO3)-Δ-[Co(ox)(en)2](d-C10H14OBrSO3)- H2O, was determined between 5 and 25 °C. It was found that the resolving agent (1R,3S,4S,7R)-3-bromocamphor-9-sulfonate ion is applicable to the optical resolution of the [Co(ox)(en)2]+ ion below 19 °C, in spite of the formation of a pseudo racemic compound Λ-[Co(ox)(en)2]·Δ-[Co(ox)(en)2](d-C10H14OBrSO3)2·2H2O.
POTASSIUM FERRATE, A NEW SELECTIVE OXIDIZING AGENT
Authors: Tsuda Yoshiko , Nakajima Shoichi
Published: July 2006

Potassium ferrate, which can be easily and economically prepared but has never been used in organic syntheses, was found to be a new efficient selective oxidizing agent. It works at room temperature on a variety of benzyl alcohols to yield benzaldehydes without further oxidation.
THE REACTION OF AZIDOFORMATES WITH ALLYL ETHERS IN THE PRESENCE OF TRANSITION METAL COMPLEXES
Authors: Migita Toshihiko , Chiba Mitsuo , Kosugi Masanori , Nakaido Setsuko
Published: July 2006

Palladium complex catalyzed reaction of azidoformates with allyl ethers afforded N-carboalkoxyimines III as major products, contrasting with the corresponding photo-induced and thermal reactions. Formation of III is thought to involve α-C–H insertion of carboalkoxy nitrene as a primary step.
SYNTHESIS OF PROSTAGLANDIN ANALOGS I. NOVEL AND EFFECTIVE INTERMEDIATES FOR MODIFICATION OF ω-CHAIN
Authors: Wakatsuka Hirohisa , Konishi Yoshitaka , Kori Seiji , Hayashi Masaki
Published: July 2006

A simple and effective preparation of the useful intermediates for the synthesis of the prostaglandin (PG) analogs which are modified at ω-chain is reported.
DIMETHYLTHALLIUM COMPLEXES OF DICYCLOHEXYL-18-CROWN-6
Authors: Kawasaki Yoshikane , Kitano Rhu-ichiro
Published: July 2006

Dimethylthallium complexes of dicyclohexyl-18-crown-6, [(CH3)2Tl(L)]pic, L = DCC-A (1) and DCC-B (2), were prepared. The two methyl protons are not equivalent magnetically in 1, but equivalent in 2. A linear CH3–Tl–CH3 moiety was held strongly and perpendicularly in the quasi-planar ring of six oxygen atoms. The conformation of cyclohexyl groups of the complexes was discussed.
SYNTHESIS OF VINYL IODIDES FROM VINYL BROMIDES AND POTASSIUM IODIDE BY MEANS OF NICKEL CATALYST
Authors: Takagi Kentaro , Hayama Naomi , Inokawa Saburo
Published: July 2006

Vinyl bromides such as (E)-β-methoxycarbonyl-, (E) or (Z)-β-phenyl-, (Z)-β-ethoxy-, or β,β-dimethylvinyl bromide smoothly reacted with an iodide ion in the presence of nickel catalyst to give the corresponding vinyl iodides with complete retention of configurations.
A NEW RADIATION-INDUCED REACTION OF THIAMINE WITH DI-1-ADAMANTYL TETRASULFIDE
Authors: Hayashi Nobuyoshi , Kato Shinji
Published: July 2006

Radiation-induced reaction of thiamine monochloride with di-1-adamantyl tetrasulfide gave two products, 3-(4-amino-2-methyl-5-pyrimidinylmethyl)-6a-(1-adamantyldithio)-3a-methylperhydrofuro[2,3-d]thiazole and 2-(1-hydroxymethyl)-3-(4-amino-2-methyl-5-pyrimidinylmethyl)-6a-(1-adamantyldithio)-3a-methylperhydrofuro[2,3-d]thiazole.
METAL-CATALYZED ORGANIC PHOTOREACTIONS ONE-STEP SYNTHESIS OF CHLORINATED KETONES FROM OLEFINS BY THE PHOTO-OXIDATION IN THE PRESENCE OF IRON(III) CHLORIDE
Authors: Murayama Eigoro , Kohda Akira , Sato Tadashi
Published: July 2006

Under the photo-oxidation in pyridine in the presence of iron(III) chloride, mono- and di-substituted olefins gave α-chloroketones, while tri- and tetra-substituted olefins gave dichloroketones involving C–C bond cleavage.
PHOTO-INDUCED CHARGE SEPARATION WITH RED LIGHT IN THE HYDRATED AGGREGATES OF A SURFACE-ACTIVE MAGNESIUM PORPHYRIN
Authors: Yamamura Takeshi
Published: July 2006

A reversible charge separation induced by the red light illumination was achieved by using the hydrated powder and the hydrated reversed micellar colloid of a cationic surface-active magnesium porphyrin. The effect of the hydration was studied.
CARBANION OF O-ETHYL S-(TETRAHYDRO-2-OXO-3-FURANYL) THIOCARBONATE: A NEW REAGENT FOR THE STEREOSELECTIVE SYNTHESIS OF α-ALKYLIDENE-γ-BUTYROLACTONES FROM CARBONYL COMPOUNDS
Authors: Tanaka Kazuhiko , Yamagishi Nobuyuki , Uneme Hideki , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

The lithium salt of O-ethyl S-(tetrahydro-2-oxo-3-furanyl) thiocarbonate was found to be an efficient reagent for the stereoselective synthesis of α-alkylidene-γ-butyrolactones from carbonyl compounds.
SYNTHESIS OF [2,2] FERROCENOPHANE-1,13-DIENE
Authors: Kasahara Akira , Izumi Taeko
Published: July 2006

[2,2] Ferrocenophane-1,13-diene (1) was synthesized via the intermolecular coupling of ferrocene-1,1′-dicarbaldehyde (2) with TiCl4–LiAlH4. The catalytic hydrogenation of 1 led to the formation of [2,2] ferrocenophane (7). An alternate approach to the synthesis of 7, involving the reductive coupling of 1,1′-bis(hydroxymethyl)ferrocene with TiCl4–LiAlH4 is described.
REGIOSPECIFIC BRIDGEHEAD BROMINATION IN TRICYCLO[4.3.1.12,5]UNDECANE. HIGH REACTIVITY OF THE 1- OVER THE 2-CARBON ATOM IN A CARBOCATION REACTION
Authors: Inamoto Yoshiaki , Aigami Koji , Fujikura Yoshiaki , Ohsugi Motoyoshi , Takaishi Naotake , Tsuchihashi Kiyoshi , Ikeda Hiroshi
Published: July 2006

Bromination of tricyclo[4.3.1.12,5]undecane (3) gave exclusively the 1-bromo derivative (5). The structure of 5 was determined unequivocally by making use of deuterium isotope effects on 13C NMR signals of 1-deuterio-3 (6) derived from 5 and 10,10-dideuterio-3 (4) prepared from the dideuterated alcohol 2.
THE ROLE OF METAL IONS IN NADH MODEL REACTIONS
Authors: Watanabe Ken-ichi , Kawaguchi Riuji , Kato Hirokazu
Published: July 2006

Pyridine-2-carbaldehyde and formylferrocene were reduced with 1-benzyl-1,4-dihydronicotinamide and zinc acetate in isopropyl alcohol at 50°C. The reactions were promoted when the quantity of Zn2+ added was increased. No reduction was observed with Pt(II) or Ni(II). Ternary complex as an intermediate was implied.
MULTISTEP OXIDATIONS OF THE UNSYMMETRICAL DISULFIDE AND THIOLSULFINATES: NEW EVIDENCE FOR THE FORMATION OF THE THIONITRITE AND THE SULFINYL DERIVATIVES AS THE INTERMEDIATES
Authors: Oae Shigeru , Fukushima Daikichi , Kim Yong H
Published: July 2006

The oxidations of unsymmetrical disulfide and thiolsulfinates with excess dinitrogen tetraoxide afforded the corresponding symmetrical thiolsulfonates as the main product. The oxidation was found to involve the formations of intermediates of the thionitrite and the sulfinyl nitrite or the sulfinyl nitrate, which are undoubtedly formed by the fission of S–S bond.
ELECTROCHEMICAL PHOTOCELL USING CdS–ZnSe SOLID SOLUTION FILM ANODE
Authors: Tsuiki Masayasu , Ueno Yasusada , Nakamura Tsuyoshi , Minoura Hideki
Published: July 2006

Epitaxial films of CdS–ZnSe solid solution were prepared by vacuum evaporation from the source composed of equimolar amounts of CdS and ZnSe onto the (III) thin films of a NaCl–NaBr solid solution system. The action spectrum of the electrochemical photocell using these epitaxial films as photoanodes in a S2−-containing electrolyte was shifted to the longer wavelength region by about lOOnm compared with a CdS thin film anode. The open-circuit voltage and the short-circuit current were found to be 0.54 V and 0.7 mA/cm2, respectively, under sunlight of 62 mW/cm2.
OXABICYCLONONANE DERIVATIVES
Authors: Kato Tetsuzo , Sato Masayuki , Kitagawa Yoshinori
Published: July 2006

Reactions of 1-hydroxy-4,4-dimethylcyclooctane-2,6-dione-1-acetic acid β-lactone (1) and 6-acetoxy-7-hydroxy-4,4-dimethyl-cis-bicyclo[4.2.0]octan-2-one-7-acetic acid β-lactone (2) with methylamine give the oxabicyclononane derivatives (4a and 4b). Reaction of compound 1 with dimethylamine gives the amide (3a), whose transannular prototropic tautomerism is discussed.
PREPARATION OF CHIRAL AMINOPHOSPHINE LIGANDS AND THEIR USE IN ASYMMETRIC HOMOGENEOUS HYDROGENATION OF ITACONIC ACID
Authors: Yamamoto Keiji , Tomita Akira , Tsuji Jiro
Published: July 2006

Optically active aminophosphines were prepared via ortho-directed metalation of appropriate arylamines followed by introduction of a diphenylphosphino group. These aminophosphines were used as ligands in the rhodium complex-catalyzed asymmetric hydrogenation of itaconic acid. Although moderate optical yields (up to 43% ee) were obtained, the stereochemical outcome with each ligand depended markedly on the chelate effect of the aminophosphines which played a significant role in both catalytic activity and enantioselectivity.
CHROMATOGRAPHIC SEPARATION OF NITROGEN ISOTOPES USING PURE WATER AS ELUTING AGENT
Authors: Kotaka Masahiro , Shono Tuyoshi , Kakihana Hidetake
Published: July 2006

Aqueous solutions of ammonia were passed through ion-exchange columns. In some experiments the column was packed with a strongly acidic cation exchanger Diaion SK-IB in magnesium form, and in the others a weakly acidic cation exchanger composed of succinylated aminododecylcellulose with 3-aminobenzeneboronic acids was used. The ammonium bands formed in the columns were eluted with pure water. It was found that: (1) Nitrogen-15 was enriched in the rear part of the band, and depleted in the front part. (2) The ammonia charged to the column packed with Diaion SK-IB was completely eluted with pure water.
PHOTOCHEMICAL SYNTHESIS OF NEW NITROGEN-CONTAINING POLYCYCLIC AROMATIC COMPOUNDS— NAPHTHO[2,3-c]CARBAZOLE AND ANTHRA[2,1-b]PYRROLE DERIVATIVES
Authors: Maruyama Kazuhiro , Mitsui Kiichiro , Otsuki Tetsuo
Published: July 2006

8,13-Naphtho[2,3-c]carbazoledione 3 and 6,11-anthra[2,1-b]pyrroledione 10, were synthesized in a good yield via photolysis of quinone and 1,1-diarylethylene, Reduction of 3 and 10 gave corresponding polycyclic aroma tics 4 and 11.
PHOTOCHEMICAL DIMERIZATION OF 2-ACYL-1,4-QUINONES
Authors: Miyagi Yo , Kitamura Kazuo , Maruyama Kazuhiro , Chow Yuan Lang
Published: July 2006

Upon irradiation 2-acyl-1,4-quinones (I) underwent a regiospecific condensation to give their dimers, polycyclic compounds (II). An alternative structure (II′), though it is compatible with the NMR spectra of the dimers, was excluded on the basis of converting one of the dimers to a 9,10-phenanthrenequinone derivative (IV). No condensation of I with dienophiles occurred.
FAR-INFRARED SPECTRUM AND PHASE TRANSITION OF CsSrCl3
Authors: Morioka Yoshiyuki , Nakagawa Ichiro
Published: July 2006

Temperature dependence of the far-infrared spectrum of CsSrCl3 has been measured. At high temperature the spectrum has three absorption bands, which is characteristic to the cubic perovskite-type structure. Lowering the temperature, one new band appears at 153 cm−1 . Other spectral change is not significant. The new band is interpreted as an i.r. active component of a f2u mode for the high temperature phase which undergoes a factor group splitting in a phase transition to the lower symmetry phase.
STABILIZATION OF PHOTOANODES IN ELECTROCHEMICAL PHOTOCELLS FOR SOLAR ENERGY CONVERSION
Authors: Fujishima Akira , Inoue Tooru , Watanabe Tadashi , Honda Kenichi
Published: July 2006

The stabilization of the semiconductor photoanodes by redox agents have been studied in the semiconductor/electrolyte system. A general interpretation of the experimental results is possible referring to the standard redox potentials (Eredox) of the reducing agents and to the electrochemical decomposition potentials (ED) of the semiconductors.
EMISSION OF LOW-ENERGY LUMINESCENCE FROM SURFACTANT MICELLES WITH AN AROMATIC CHROMOPHORE
Authors: Kajiwara Makoto , Mihara Satoru , Yudate Kohzo , Matsuo Taku
Published: July 2006

Fluorescence spectra of cationic surfactants, with a phenoxy group as a part of the molecular structure, were studied. On the formation of the micelles, luminescences with energy lower than that of the monomer were observed, and it was taken to indicate the presence of interactions involving photoexcited phenoxy group aligned in the micellar interior.
REDUCTIVE SILYLATION REACTIONS OF SULFIDES. A FACILE CONVERSION OF CARBON-SULFUR LINKAGES INTO CARBON-SILICON ONES
Authors: Kuwajima Isao , Abe Toru , Atsumi Kunio
Published: July 2006

It has been found that various phenyl sulfides undergo reductive silylation to afford the corresponding alkyltrimethylsilanes in good yield.
SYNTHESIS OF ETHYL α-(DIETHYLPHOSPHONO)ACRYLATE AND ITS HOMOLOGS: VERSATILE SYNTHETIC REAGENTS
Authors: Ide Junya , Endo Rokuro , Muramatsu Shigeki
Published: July 2006

Ethyl α-(diethylphosphono) acrylate (2a) and ethyl β-methyl-α-(diethylphosphono) acrylates (E-2b and Z-2b) were prepared. The cycloaddition reaction of 2a with salicylaldehyde gave 3-ethoxycarbonyl-3-chromenes (9).
STEREOCHEMISTRY OF THE ALKALINE HYDROLYSIS OF N-CHLOROSULFIMIDES TO SULFOXIMIDES
Authors: Akasaka Takeshi , Yoshimura Toshiaki , Furukawa Naomichi , Oae Shigeru
Published: July 2006

(−)-(S)-N-Chloro-S-o-methoxyphenyl-S-phenylsulfimide was prepared and its alkaline hydrolysis afforded the corresponding sulfoximide. This hydrolysis was found to proceed with a retention of configuration at the reaction center.
A HIGHLY SELECTIVE METHOD FOR THE SPECTROPHOTOMETRIC DETERMINATION OF CADMIUM(II) WITH DITHIZONE AND o-PHENANTHROLINE
Authors: Akaiwa Hideo , Kawamoto Hiroshi , Yoshimatsu Eiji
Published: July 2006

A new method for the separation of cadmium(II) from zinc(II) with dithizone in the presence o-phenanthroline was proposed. A green cadmium(II) dithizonate is extracted into chloroform at pH 2 and the green complex changes to red by shaking the extract with ammonia. The complete separation of cadmium(II) from zinc(II) is possible by the present method.
QUENCHING OF THE LUMINESCENT EXCITED STATE OF TRIS(2,2′-BIPYRIDYL)RUTHENIUM(II) WITH BROMONITROMETHANE
Authors: Oishi Sigero , Furuta Naoko
Published: July 2006

Linear Stern–Volmer plots were obtained for cathodic photocurrents from the quenching of excited tris(2,2′-bypyridyl)ruthenium(II) with bromonitromethane at an SnO2 electrode, and the resulting Ksv was in fair agreement with that for emission quenching, indicating that the quenching process occurs by the reductive cleavage of bromonitromethane. A nitromethylated product was formed in the presence of 1,4-dimethoxybenzene.
ASYMMETRIC SYNTHESIS OF δ-OXOCARBOXYLIC ACIDS BY THE MICHAEL REACTION USING (2R,3S)-3,4-DIMETHYL-5,7-DIOXO-2-PHENYLPERHYDRO-1,4-OXAZEPINE
Authors: Mukaiyama Teruaki , Hirako Yoshiyuki , Takeda Takeshi
Published: July 2006

(2R,3S)-3,4-Dimethyl-5,7-dioxo-2-phenylperhydro-1,4-oxazepine (I) was prepared from methyl hydrogen malonate and l-ephedrine hydrochloride using 2-chloro-1-methylpyridinium tosylate as a coupling reagent. The Michael reaction of (I) to 2-cyclopenten-1-one catalyzed by 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU), followed by hydrolysis and decarboxylation gave highly optically pure 3-cyclopentanoneacetic acid.
PREPARATION OF VINYL CHLORIDES FROM ENOLIZABLE ALDEHYDES
Authors: Echigo Yoshiaki , Mukaiyama Teruaki
Published: July 2006

Treatment of enolizable aldehydes with 2-chloro-3-ethylbenzoxazolium tetrafluoroborate, triethylamine and tetraethylammonium chloride affords vinyl chlorides in good yields under mild conditions.
AROMATIC HYDROXYLATION OF 2,4,6-TRIDEUTERIOTOLUENE BY O(3P) ATOMS WITH THE NIH SHIFT OF DEUTERIUM
Authors: Hori Akira , Matsumoto Hiroyuki , Takamuku Setsuo , Sakurai Hiroshi
Published: July 2006

Hydroxylation of 2,4,6-trideuteriotoluene by O(3P) atoms gave mixtures of tri- and di-deuteriocresol in liquid phase and in gas phase. The retention values of deuterium of aromatic ring in cresols produced by the hydroxylation were similar to those reported with microsomes. The mechanism of the NIH shift via a σ-complex intermediate is proposed.
A COLOR REACTION OF AQUAHYDROGENETHYLENEDIAMINETETRAACETATORUTHENIUM(III) WITH SOME SULFUR COMPOUNDS
Authors: Yoshino Yukichi , Uehiro Takashi , Saito Masami
Published: July 2006

A new color reaction of [Ru(Hedta)(H2O)] with some compounds that contain groups C–SH or C=S has been found. Alkanethiols, cysteine, thiourea and thiosulfate assume pink to reddish brown color, while benzenethiols show blue color. It was suggested that the coloration is due to the anation of [Ru(Hedta)(H2O)] with sulfur-containing compounds.
ASYMMETRIC HYDROGENATION OF α-ACYLAMINOACRYLIC ACIDS BY THE RHODIUM(I) COMPLEX OF (1R,2R)-BIS(N-DIPHENYLPHOSPHINOMETHYLAMINO)CYCLOHEXANE
Authors: Hanaki Kazuhiro , Kashiwabara Kazuo , Fujita Junnosuke
Published: July 2006

A new rhodium(I)-(1R,2R)-bis(N-diphenylphosphinomethylamino)cyclohexane complex, the ligand of which is easily prepared from (1R,2R)-bis(methylamino)cyclohexane and chlorodiphenylphosphine, catalyzes asymmetric hydrogenation of some α-acylaminoacrylic acids to yield N-acylated amino acids with high optical purity; N-benzoyl-(S)-leucine, N-benzoyl-(S)-phenylalanine, and N-acetyl-(S)-phenylalanine are obtained in 93, 85, and 73% optical purity, respectively.
DIFFUSION OF SIMPLE IONS IN LYOTROPIC LIQUID CRYSTALS AND ORDINARY GELS IN RELATION TO THEIR STRUCTURES
Authors: Watanabe Norio , Mukai Misako , Tamamushi Bun-ichi
Published: July 2006

The diffusion velocities of simple ions: K+ Cl− into two types (lamellar and hexagonal) of lyotropic liquid crystals involved in the system: sodium dodecyl sulphate (SDS) + n-hexanol + water were measured. The results showed that the diffusion velocities into the lamellar type liquid crystals were greater than those into the hexagonal ones. The diffusion velocities for both types of liquid crystals were however found smaller than those into ordinary colloidal gels. The effect of added ions on the flow properties of the above two types of liquid crystals was examined and found different according to the difference in their ordered structures.
HIGH SELECTIVE CIS\ightleftharpoonsTRANS ISOMERIZATION OF TRI-SUBSTITUTED DOUBLE BOND BY RUTHENIUM ACETYLACETONATE
Authors: Fujita Yoshiji
Published: July 2006

Ruthenium acetylacetonate was found to be effective for high selective cis\ightleftharpoonstrans isomerization of tri-substituted double bond of geranylacetone, pseudoionone, ethyl geranylacetate etc., without any migration and hydrogenation of double bond.
PROMOTING EFFECT OF SELENIUM ON THE CATALYSIS OF LIQUID TELLURIUM IN THE DEHYDROGENATION OF POLYNUCLEAR HYDROCARBONS
Authors: Takahashi Katsumi , Ogino Yoshisada
Published: July 2006

An addition of small amount of selenium into the liquid tellurium has been found to bring about a pronounced elevation of the catalytic activity for the dehydrogenation of polynuclear hydrocarbons, i. e. tetralin, acenaphthene, 9,10-dihydroanthracene, 9,10-dihydrophenanthrene, 1,2,3,4,5,6,7,8-octahydrophenanthrene.
BROMINATION OF 9-ALLYLTRIPTYCENES: AN EXAMPLE OF ELECTROPHILIC OLEFINIC SUBSTITUTION
Authors: Hatakeyama Shiro , Mitsuhashi Tsutomu , Oki Michinori
Published: July 2006

Bromination of 9-allyl-1,2,3,4-tetrachlorotriptycene afforded a 4:1 mixture of substitution products and a normal addition product. Examination of the reactions of analogous compounds suggests that the result is most probably due to the through-space electronic effect of the chloro substituent in the peri-position.
HIGHLY EFFECTIVE CATALYTIC ASYMMETRIC HYDROGENATION OF ITACONIC ACID WITH NEW CATIONIC CHIRAL PYRROLIDINEPHOSPHINE–RHODIUM COMPLEXES
Authors: Achiwa Kazuo
Published: July 2006

Syntheses of new cationic chiral pyrrolidinephosphine–rhodium complexes and their application to the asymmetric hydrogenation of itaconic acid were described. Thus, PPPM-, BZPPM-, FPPM- and BPPM-Rh+ in the presence of triethylamine gave S-(−)-methylsuccinic acid in 87.1, 88.9, 94.2 and 93.6% optical yields respectively.
EFFECTIVE ASYMMETRIC HYDROGENATION OF ITACONIC ACID CATALYZED BY NEUTRAL AND CATIONIC RHODIUM(I) COMPLEXES WITH CHIRAL PYRROLIDINODIPHOSPHINE LIGAND
Authors: Ojima Iwao , Kogure Tetsuo , Achiwa Kazuo
Published: July 2006

Asymmetric hydrogenation of itaconic acid catalyzed by neutral and cationic rhodium(I) complexes with a chiral pyrrolidinodiphosphine, BPPM, was carried out to give (S)-(−)-methylsuccinic acid with 90–92 %e.e. in excellent yield. Enantioselectivity of the reaction was found to depend upon the amounts of triethyl amine added. In the presence of triethyl amine, the neutral catalyst is suggested to be converted to the cationic species.
A NEW SYNTHESIS OF ARYL t-BUTYL ETHERS
Authors: Masada Hiromitsu , Oishi Yutaka
Published: July 2006

Aryl t-butyl ethers were prepared in high yields by O-alkylations of phenols with t-butyl halides in the presence of pyridine or aliphatic amines for a few hours at 20–30 °C.
USE OF WATER–MISCIBLE SOLVENT IN EXTRACTION POLAROGRAPHIC METHOD OF ANALYSIS
Authors: Fujinaga Taitiro , Nagaosa Yukio
Published: July 2006

Cadmium(II) in aqueous solution can be determined polarographically, following extraction as the thiocyanate into the acetonitrile layer which is produced by salting-out with sodium sulfate.
THE GEOMETRICAL ISOMERISM OF [CoBr(Hedta)]−
Authors: Ohba Kazuo , Fujita Junnosuke
Published: July 2006

The [CoBr(Hedta)]− complex prepared by the method of Schwarzenbach has been believed to consist of two geometric isomers. However, it was found that one of these two isomers was not the bromo complex, but the chloro complex.
STUDIES ON THE SYNTHESES OF SESQUITERPENE LACTONES IV. TOTAL SYNTHESIS OF SAUSSUREA LACTONE
Authors: Ando Masayoshi , Tajima Kiyoshi , Takase Kahei
Published: July 2006

Saussurea lactone, a typical elemanolide, has been synthesized via a novel fragmentation reaction of 3α,4α-epoxy-1β-mesyloxy-5αH, 6β, 11βH-eudesman-6,13-olide with aluminium isopropoxide in toluene.
OLIGOMERIZATION OF 3-HEXYNE BY NICKEL(0) COMPLEXES UNDER CO2. INCORPORATION OF CO2 AND NOVEL CYCLOTRIMERIZATION
Authors: Inoue Yoshio , Itoh Yoshio , Hashimoto Harukichi
Published: July 2006

Tetraethyl-2-pyrone 1 was formed in good yields on the reaction of 3-hexyne with CO2 in the presence of Ni(COD)2–Ph2P(CH2)4PPh2 (COD=1,5-cyclooctadiene), and in case of Ni(COD)2–PPh3 a novel cyclotrimer, pentaethyl-5-propenylcyclopentadiene 2 was obtained selectively.
REDOX PROPERTIES OF TRISILVER DODECAMOLYBDOPHOSPHATE CATALYST
Authors: Tsuneki Hideaki , Niiyama Hiroo , Echigoya Etsuro
Published: July 2006

Redox properties of Ag3PMo12O40 were studied by means of IR spectroscopy combined with 18O-tracer technique. Oxygen of innercore oxy-anion, PO43− , were not removed by reduction with H2, although IR spectra due to PO43− drastically changed. Exchange of terminal and bridge-bonded oxygen was so fast under the condtion employed here that all the oxygens equally participated for the redox cycles of the compound.
DIANION OF α-MERCAPTO-γ-BUTYROLACTONE: AN EFFICIENT REAGENT FOR THE STEREOSELECTIVE SYNTHESIS OF α-ALKYLIDENE-γ-BUTYROLACTONES FROM CARBONYL COMPOUNDS
Authors: Tanaka Kazuhiko , Uneme Hideki , Yamagishi Nobuyuki , Ono Noboru , Kaji Aritsune
Published: July 2006

Dianion of α-mercapto-γ-butyrolactone was successfully generated by treating α-mercapto-γ-butyrolactone with lithium diisopropylamide-N,N,N′,N′-tetramethylethylenediamine at −78°C in THF. This dianion was found to be highly reactive toward electrophilic reagents. A new methodology for the stereoselective synthesis of α-alkylidene-γ-butyrolactones by one-pot procedure has been developed.
THE NEW METHOD FOR DETERMINATION OF THE STABILITY CONSTANTS OF CYCLODEXTRIN–PROSTAGLANDIN INCLUSION COMPLEXES BY LIQUID CHROMATOGRAPHY
Authors: Uekama Kaneto , Hirayama Fumitoshi , Irie Tetsumi
Published: July 2006

Stability constants (K) of cyclodextrin–prostaglandin complexes were determined by liquid chromatography. The retention times of some prostaglandins following the binding to α- and β-cyclodextrins in aqueous mobile phase on anion exchange support were quantitatively treated to yield the K values. The results were fair agreement with those obtained by spectroscopic and solubility methods.
A REGIOSELECTIVE COUPLING REACTION OF ALLYL PYRIDYL ETHERS WITH GRIGNARD REAGENTS
Authors: Mukaiyama Teruaki , Yamaguchi Masahiko , Narasaka Koichi
Published: July 2006

A regioselective coupling reaction of Grignard reagents with allyl pyridyl ethers in the presence of MgBr2 is reported. Grignard reagents reacted easily with primary allyl ethers to afford C-1 alkylated products (SN2 reaction), and also reacted with secondary and tertiary allyl ethers to afford C-3 alkylated products (SN2′ reaction).
RING ENLARGEMENT REACTION OF 1-AMINOINDOLES TO CINNOLINE DERIVATIVES
Authors: Somei Masanori , Ura Kazuko
Published: July 2006

1-Aminoindoles were converted to the corresponding 1,4-dihydrocinnolines and cinnolines in an acidic medium.
SURFACE PROPERTIES OF 12-MOLYBDOPHOSPHORIC ACID CATALYST
Authors: Misono Makoto , Konishi Yasuo , Furuta Motonobu , Yoneda Yukio
Published: July 2006

Surface properties and catalytic activity for butene isomerization have been investigated for 12-molybdophosphoric acid. The surface area changed reversibly by dehydration and hydration below 300°C, but irreversible destruction was caused at 400°C. The catalytic activities per unit surface area were nearly constant. From these results and infrared spectra of pyridine adsorbed, strong protonic acidity probably of nearly uniform acid strength was concluded.
SYNTHESIS OF SUBSTITUTED VINYL SULFONES VIA DEACYLATION
Authors: Kotake Hiroshi , Inomata Katsuhiko , Sumita Manabu
Published: July 2006

It was found that the anions of β-ketosulfones reacted with formaldehyde to give the corresponding vinyl sulfones via deacylation, which provides a new preparative method for olefinic bonds.
ALKYLATION OF THE DIANION OF 2,4-DIMETHOXYCARBONYL-3-METHYL-2-CYCLOPENTENONE AND ITS APPLICATION TO THE SYNTHESIS OF THE COREY’S TYPE PG INTERMEDIATES
Authors: Ide Junya , Inoue Kenji , Sakai Kiyoshi
Published: July 2006

The alkylation of 2,4-dimethoxycarbonyl-3-methyl-2-cyclopentenone (1) by the dianion-method provides regiospecifically and stereoselectively alkylated products (3a–i) in moderate yields. The alkylated product (3g) was transformed into the Corey’s lactones (6 and 9) for 11-methyl- and 11,11-dimethyl-11-deoxy-PGs, respectively.
HIGHLY STABLE TAUTOMERS OF β-KETOESTER: CONFORMATIONS OF 9-OXO-8,9,10,11-TETRAHYDRO- AND 9-HYDROXY-10,11-DIHYDRO-7H-CYCLOOCTA-[de]NAPHTHALENE-8-CARBOXYLIC ESTERS
Authors: Kamada Toshihiro , Yamamoto Osamu
Published: July 2006

Tautomers of the titled β-ketoester, both keto (1) and enol (2), are obtained, which are unusually stable in the solid state as well as in solution. NMR studies revealed that 1 exists as an equi-librium mixture of axial-boat (ab) and equatorial-boat (eb) conformers in solution, whereas 2 exists in only one conformation.
FORMATION OF ALUMINUM PHOSPHATES AT LOW TEMPERATURES
Authors: Tsuhako Mitsutomo , Matsuo Tsuneo , Motooka Itaru , Kobayashi Masamitsu
Published: July 2006

In the Al(OH)3–H3PO4 system, AlH3(PO4)2·3H2O was formed at 50–70°C, AlH3(PO4)2·H2O at 70–110°C and the C type of Al(H2PO4)3 at 120–190°C. On the other hand, in the α-Al2O3–H3PO4 system no crystalline aluminum phosphate could be obtained even at 200°C.
THE TEMPERATURE DEPENDENCE OF HYDROGENOLYTIC ASYMMETRIC TRANSAMINATION BETWEEN ESTERS OF OPTICALLY ACTIVE PHENYLGLYCINE AND PYRUVIC ACID
Authors: Harada Kaoru , Kataoka Yoshiharu
Published: July 2006

Asymmetric synthesis of alanine by hydrogenolytic asymmetric transamination between ethyl (R)-α-phenylglycinate and ethyl pyruvate was studied. Clear temperature dependence in the asymmetric synthesis was observed and the configuration of alanine was inverted depending on the reaction temperature used. The results are explained by the chelation hypothesis based on the substrate–catalyst complex.
THE (V5+=O) BOND RESPONSIBLE FOR THE ACCELERATION OF THE NO–NH3 REACTION ON VANADIUM OXIDE IN DILUTE GAS CONDITION
Authors: Inomata Makoto , Miyamoto Akira , Murakami Yuichi
Published: July 2006

The NO–NH3 reaction was markedly accelerated by the addition of O2 up to 1%. It was found that the (V5+=O) bond on the surface of vanadium oxide plays as active site for the reduction of NO by NH3 and the reaction is accelerated in proportion to the amount of the (V5+=O) bond.
REGIO- AND STEREOSELECTIVE CYCLOPROPANE RING OPENING IN A TETRACYCLIC COMPOUND. exo-4-ACETOXY-4-HOMOISOTWISTANE (exo-4-ACETOXYTRICYCLO[5.3.1.03,8]UNDECANE) FROM 2,4-DEHYDRO-4-HOMOTWISTANE (TETRACYCLO[ 5.4.0.02,4.03,9]UNDECANE) IN ACETIC ACID UNDER SULFURIC ACID CATALYSIS
Authors: Takaishi Naotake , Fujikura Yoshiaki , Inamoto Yoshiaki
Published: July 2006

Sulfuric acid catalyzed reaction of 2,4-dehydro-4-homotwistane (1) with acetic acid gave predominantly exo-4-acetoxy-4-homoisotwistane (2). The result is best interpreted in terms of the edge-protonated cyclopropane intermediate 1-H+ , in which the ring opening occurs to give the most stable skeletal structure 8, while the regio- and stereoselectivity arise from the attack of AcOH at the least congested exo-4 site.
IR SPECTRA OF THE REACTION PRODUCTS BETWEEN IRON VAPOR AND NITRIC OXIDE: A MODEL FOR THE CHEMISORPTION OF NITRIC OXIDE
Authors: Bandow Hiroshi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

Based on the IR spectroscopic study of the reaction products between iron vapor and nitric oxide, which can be regarded as a model of chemisorbed species, the IR absorption bands of nitric oxide adsorbed on iron at 1800 and 1720 cm−1 are attributed to adsorbed species on oxidized and metallic iron, respectively
A NOVEL METHOXYLATION OF ALLYLIC ALCOHOLS VIA ALLYLIC REARRANGEMENT USING DICHLOROBIS(TRIPHENYLPHOSPHINE)PLATINUM(II)-TIN(II)CHLORIDE DIHYDRATE COMPLEX CATALYST
Authors: Ichinohe Yoshiyuki , Sakamaki Hiroshi , Kameda Noriyuki
Published: July 2006

Several allylic steroidal alcohols give rearranged allyl methyl ethers by dichlorobis(triphenylphosphine)platinum(II)–tin(II)chloride dihydrate complex catalyst in methanol.
ISOMERIZATION AND DEHYDROGENATION OF CYCLOHEXENE OVER TaS2AND TRANSITION METAL INTERCALATED TaS2
Authors: Saito Yoshiaki , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

Over TaS2 and M1⁄3TaS2 (M = Ni, Fe, and Co), cyclohexene undergoes dehydrogenation to benzene and isomerization to 1-methylcyclopentene selectively in nitrogen and hydrogen atmosphere, respectively. Considerable promoting effects on catalytic activity are exerted by the intercalation of Ni and Fe. Moreover, metal intercalation has an effect to prolong a catalyst life.
RESONANCE RAMAN SPECTRA OF [Pt(tn)2] [PtBr2(tn)2]X4(tn = trimethylenediamine, X = CIO4 and BF4)
Authors: Ohta Nobuhiro , Kozuka Muneteru , Nakamoto Kazuo , Yamashita Masahiro , Kida Sigeo
Published: July 2006

Resonance Raman spectra of [Pt(tn)2][PtBr2(tn)2]X4 were measured with the excitation lines, 457.9, 488.0, 514.5, 530.9, 568.2, 647.1 and 676.4 nm. The symmetric Br–Pt–Br stretching (ν1) vibration was strongly enhanced in this region. The excitation profiles of ν1, and its overtones roughly follow the band contour of its electronic absorption. This is a marked contrast to that of Reihlen’s Green, where the excitation profiles of the same vibrations were remarkably different from its electronic spectrum.
PREPARATION OF [Co(TeO6H4)(en)2]+ AND ITS CONDENSED COMPLEXES
Authors: Hosokawa Yutaka , Shimura Yoichi
Published: July 2006

Three new complexes, [Co(TeO6H4)(en)2]+,[Co(en)2(Te2O10H4)Co(en)2]2+, and [{Co(en)2}2(Te2O10){Co(en)2}2]4+ , have been isolated as their chlorides from the reaction solutions of cis-[CoCl2(en)2]+ and Te(OH)6, and their optical resolutions have been achieved.
PHOTO-INDUCED SOLVENT-INCORPORATED ADDITION OF N-METHYLPHTHALIMIDE TO OLEFINS. REACTIONS PROMOTED BY WAY OF INITIAL ONE ELECTRON TRANSFER
Authors: Maruyama Kazuhiro , Kubo Yasuo
Published: July 2006

Irradiation of N-methylphthaiimide 1 and styrene 2b in methanol gave two solvent-incorporated isomeric adducts 4a and 5a. The corresponding solvent-incorporated adducts (1 : olefin : alcohol = 1:1:1) were obtained in the photochemical reaction of 1 with several olefins 2a–f in alcohols. A mechanism involving one electron transfer from 2b to 1 is proposed.
PREPARATION OF TIN-DOPED INDIUM OXIDE THIN FILMS BY THERMAL DECOMPOSITION OF METAL OCTANOATES
Authors: Tsunashima Atsumu , Asai Toshinobu , Kodaira Kohei , Matsushita Toru
Published: July 2006

Tin-doped indium oxide thin films have been prepared by thermal decomposition of metal octanoates at 400–600°C. Typical films are 2000–5000 Å thick with a sheet resistance of 350–850 ohm/square and a specific resistivity of 1.7×10−2 ohm-cm, and with a light transmission of more than 90 %.
ADDUCTS OF BIS(O,O′-DIETHYL DITHIOPHOSPHATO)COBALT(II) WITH SOME AMINES AND TRIPHENYLPHOSPHINE
Authors: Yamada Yukio , Shimoi Mamoru , Ouchi Akira
Published: July 2006

The 1:1 triphenylphosphine, hexamine, piperazine, pyrazine, and benzothiazole adducts, as well as the 2:1 benzothiazole and benzimidazole adducts of bis(O,O′-diethyl dithiophosphato)cobalt(II) were obtained as crystalline solids, which were hardly oxidized in air, but partially dissociated in their solutions.
SYNTHESIS AND CONFORMATION OF 1,2,4-TRI-O-ACTYL-5,6-DIDOXY-3-O-METHYL-5-C-[(S)-PHENYLPHOSPHINYL]-β-d-GLUCOPYRANOSE
Authors: Yamashita Mitsuji , Nakatsukasa Yasuhiko , Inokawa Saburo , Hirotsu Ken , Clardy Jon
Published: July 2006

Hydrolysis of phenylphosphinyl derivative of hexofuranose (1) followed by acetylation gave two compounds. The X-ray analysis of one component revealed the structure to be 1,2,4-tri-O-acetyl-5,6-dideoxy-3-O-methyl-5-C-[(S)-phenylphosphinyl]-β-d-glucopyranose (3a) which had a 4C1 (d) conformation.
DEPENDENCY OF THE RATIO OF THE DIASTEREOMERS, l- AND d-t-LEUCYL-l-VALINE, ON THE COUPLING METHODS
Authors: Miyazawa Toshifumi , Takashima Katsumi , Yamada Takashi , Kuwata Shigeru , Watanabe Hiroshi
Published: July 2006

In the condensation of N-pivaloyl- or N-benzyloxycarbonyl-Dl-t-leucine with methyl l-valinate, the ratio of the resulting diastereomers varied depending upon the coupling method.
SYNTHESIS OF PISCERYTHRONE
Authors: Nakayama Mitsuru , Hayashi Shûichi , Tsukayama Masao , Horie Tokunaru , Masumura Mitsuo
Published: July 2006

5,7,2′,4′-Tetrahydroxy-5’-methoxyisoflavone (6) prepared from 2,4,2′,4′-tetrabenzyloxy-6’-hydroxy-5-methoxychalcone (2) by way of three steps was partially benzoylated to give 7-benzoyloxy-5,2′,4′-trihydroxy-5′-methoxychalcone (7). The condensation of 7 with 2-methyl-3-buten-2-ol afforded 7-benzoyloxy-5,2′,4′-trihydroxy-5′-methoxy-3′-(3-methyl-2-butenyl) isoflavone (8), which was hydrolyzed to give piscerythrone (1).
A USEFUL METHOD FOR THE SYNTHESIS OF MACROCYCLIC LACTONE
Authors: Narasaka Koichi , Maruyama Kazuo , Mukaiyama Teruaki
Published: July 2006

Long chain hydroxy acids were converted into macrocyclic lactones in high yields by the treatment with 2-chloro-6-methyl-1,3-diphenylpyridinium tetrafluoroborate, 2,6-dimethylpyridine (or 2,4,6-triphenylpyridine) and benzyltriethylammonium chloride. The lactonization reaction was successfully applied to the synthesis of (R) - (+)-ricinelaidic acid lactone, and prostaglandin F2α 1,9- and 1,15-lactones.
THE EFFECT OF PYRIDINE ON THE HYDROGEN ABSORPTION PROCESS OF BIS(DIMETHYLGLYOXIMATO)COBALT(II)
Authors: Yamaguchi Tatsuaki , Miyagawa Ryuji
Published: July 2006

The initial hydrogen absorption rate of the methanolic solution of isolated pyridinecobaloxime was measured manometrically at 30°C. The rate dependence on the cobaloxime concentration was varied with excess pyridine added to the solution. The results gave the mechanistic elucidation for the hydrogen absorption process.
THE REVISED STRUCTURE OF DISPERMOL AND TOTAL SYNTHESIS OF (−)-DISPERMONE, (+)-DISPERMOL, AND (+)-MAYTENOQUINONE
Authors: Matsumoto Takashi , Usui Shuji
Published: July 2006

The total syntheses of natural tricyclic diterpenes, (−)-dispermone (1), (+)-dispermol (5), and (+)-maytenoquinone (3), were successfully achieved starting from (R)-(−)-α-cyclocitral (6) and the proposed structure (2) for dispermol was revised to 12-hydroxy-13-methoxytotara-8,11,13-triene (5).