-
Ruriko Tahara, Kiyoshi Hasebe, Hiroshi Nakamura
1995 Volume 24 Issue 9 Pages
753-754
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A fluorescent reagent (
1) which has an electron donor and an acceptor at each terminal of linear polyether chain was synthesized, and the complexation behavior of
1 with alkaline earth metal ions was investigated. Quenching of the fluorescence spectrum and changes of
1H-NMR spectrum at the complexation with the metal ions showed the interaction between two moieties in both excited state and ground state.
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Toshinori Sato, Hiroyuki Akino, Yoshio Okahata
1995 Volume 24 Issue 9 Pages
755-756
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A cationic lipoglutamide having tetraethyleneglycol tails was synthesized. A DNA complex with the cationic lipoglutamide was formed in water, and showed efficient uptake into Hela cells.
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Akira Watanabe, Osamu Ito, Takao Miwa
1995 Volume 24 Issue 9 Pages
757-758
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One-pot synthesis of perfluorobutyl-substituted polysilynes from perfluorobutyl iodide and tetrachlorosilane was achieved by electrochemical reduction using a magnesium working electrode. Absorption and emission spectra of those polymers showed characteristics of a silicon network polymer.
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César Raposo, Marta Almaraz, Mercedes Martín, Volker Wei ...
1995 Volume 24 Issue 9 Pages
759-760
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Tris(2-aminoethyl)amine and cis-1,3,5-tris(aminomethyl)cyclohexane have been checked as spacers for phosphate receptors. Ureas are better binding arms than thioureas for these spacers while the combination of this first functional group with chromenone fragments permits further increases in the phosphate and sulfate association constants.
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Isamu Moriguchi, Futoshi Shibata, Yasutake Teraoka, Shuichi Kagawa
1995 Volume 24 Issue 9 Pages
761-762
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The size of quantized CdS formed in Langmuir-Blodgett (LB) films was precisely controlled by the occupied molecular area of amphiphile and the repetition number of the sulfidation-intercalation cycle, because the concentration of Cd
2+ ions introduced in the hydrophilic interlayers was determined by these two factors. The size of CdS formed in the bilayer film was fairly larger than that in corresponding LB film, showing the influence of the orderliness of the matrix film on the formation of CdS in the hydrophilic interlayers.
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Susumi Hatakeyama, Kennichiro Kojima, Hiroko Fukuyama, Hiroshi Irie
1995 Volume 24 Issue 9 Pages
763-764
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(11
R,12
S,13
S,9
Z,15
Z)-9,12,13-Trihydroxyoctadeca-9,15-dienoic acid, a self-defensive substance against rice blast disease, has been synthesized in an enantiomerically pure form in 8% overall yield from (2
E,5
E)-1,2-dibenzyloxy-2,5-heptadien-4-ol.
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Kenji Funatsu, Akira Kimura, Taira Imamura, Yoichi Sasaki
1995 Volume 24 Issue 9 Pages
765-766
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A novel cyclic ruthenium porphyrin tetramer was synthesized and characterized by spectral methods.
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Hirokazu Matsubara, Makoto Takada, Shinichi Koyama, Kazuhito Hashimoto ...
1995 Volume 24 Issue 9 Pages
767-768
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TiO
2-containing papers with highly photocatalytic activity have been prepared. Their photocatalytic activity was investigated by measuring the decomposition of gaseous acetaldehyde under illumination from a weak UV light source such as a conventional white fluorescent light bulb. It was found that the photocatalytic efficiency of the TiO
2-containing papers was higher than that of Degussa P-25, one of the most efficient commercial TiO
2 powders, indicating that paper pulp serves as a good matrix for highly efficient TiO
2 photocatalysts.
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Ikuya Matsuura, Tomohiro Ishimura, Naomasa Kimura
1995 Volume 24 Issue 9 Pages
769-770
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A new phase of vanadyl(IV) hydrogen phosphate sesquihydrate, VO(HPO
4)·1.5H
2O, has been obtained by the reduction of VOPO
4·2H
2O with 1-butanol. The unit cell is the orthorhombic system with lattice constants a = 7.43 Å, b = 9.62 Å, and c = 7.97 Å. in space group P
mmn.
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Takeshi Takeda, Ko-ichi Matsunaga, Yuki Kabasawa, Tooru Fujiwara
1995 Volume 24 Issue 9 Pages
771-772
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The stereospecific allylation of vinylstannanes with allylic halides proceeded in the presence of copper(I) iodide in DMSO-THF at room temperature. The stereospecificity of the reaction was dependent on the structures of vinylstannanes and allylic halides, and also the leaving group of allylic halides employed. Concerning the regioselectivity regarding allylic system, higher α-regioselection was observed in the reactions of allylic chlorides than in those of the corresponding iodides.
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Seiki Tanada, Takeo Nakamura, Naohito Kawasaki, Akifumi Iwaki, Yasuhir ...
1995 Volume 24 Issue 9 Pages
773-774
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The surface modification of activated carbon using low temperature plasma of tetrafluoromethane was investigated to evaluate the removal of trichloroethylene. The plasma-treated, activated carbon underwent an immersion water and/or heat-treatment. The adsorption isotherms of trichloroethylene onto the activated carbons were measured to elucidate the relationship between the adsorption behavior of trichloroethylene and the introduced fluoride atoms. The trichloroethylene adsorption sites on plasma-treated, activated carbon are related to the fluoride atom species of the adsorption type, that is, the ion type.
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Yukio Yamamoto, Yukihiko Naka, Yoichi Yoshida, Seiichi Tagawa
1995 Volume 24 Issue 9 Pages
775-776
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The association constants for the inclusion complexation of 4-biphenylcarboxylate and its analogs with β-cyclodextrin are determined by a pulse radiolysis method for the kinetic analysis of the one-electron reduction by the hydrated electron.
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Koichiro Jitsukawa, Tetsuya Yamamoto, Hiroshi Takahashi, Hideki Masuda ...
1995 Volume 24 Issue 9 Pages
777-778
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A new type of amino acid exchange reaction that is promoted by the α-hydroxylation was found to proceed on the bis(pyridoxylidene-α-hydroxyamino acidato)cobalt(III) complexes under aerobic conditions.
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Saeid Razee, Atsushi Tamura, Tsutomu Masujima
1995 Volume 24 Issue 9 Pages
779-780
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Capillary electrophoresis was successfully applied for the determination of a gaseous analyte of interest i.e., dissolved oxygen in water samples, for the first time. Each analysis was performed within 5 min and as low as 50 ppb dissolved oxygen can be determined by this method. The proposed method was successfully applied for the analysis of river water. The method is versatile for analysis of miniaturized samples and studies of reaction kinetics.
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Isamu Shiina, Hayato Iwadare, Masahiro Saitoh, Naoto Ohkawa, Toshihiro ...
1995 Volume 24 Issue 9 Pages
781-782
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Optically active 9-
t-butyldiphenylsiloxy-11,11-dimethyl-5-methoxymethoxy-1,2,6-tribenzyloxybicyclo[5.3.1]undec-3,7-diene (
12) was synthesized from diketone
9 via an intramolecular aldol reaction. The diketone
9 was synthesized from 7-
t-butyldimethylsiloxy-4,8-dibenzyloxy-6,6-dimethyl-5-
p-methoxy-benzyloxy-2-cycloocten-1-one (
1) by way of a two-step sequence using diastereoselective allylation with allylmagnesium bromide followed by Wacker oxidation.
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Shinro Yasui, Kosei Shioji, Munekazu Tsujimoto, Atsuyoshi Ohno
1995 Volume 24 Issue 9 Pages
783-784
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Cation radicals generated from trivalent-phosphorus compounds through single-electron transfer to methylviologen undergo ionic reactions with alcohols or thiols. A kinetic analysis of the reactions has suggested that the reaction of the trivalent-phosphorus cation radicals with alcohols possesses a tighter transition state than that with thiols.
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Yutaka Saitoh, Takakazu Yamamoto
1995 Volume 24 Issue 9 Pages
785-786
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Poly(1,10-phenanthroline-3,8-diyl) has been synthesized by dehalogenation polycondensation of 3,8-dibromo-1,10-phenanthroline with a zerovalent nickel complex. The polymer has molecular weight of 6800 and is electrochemically reduced at E
pa = 2.24 V
vs Ag/Ag
+.
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Sung Sik Kim, Ae Rhan Kim, Kwang Joong O, Dong Jin Yoo, Sang Chul Shim
1995 Volume 24 Issue 9 Pages
787-788
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Irradiation of a dichloromethane solution of tetramethyl-1,4-benzoquinone and 1,4-diethynylbenzene with 300 nm UV light yields three kinds of photoadducts which are interconverted photochemically into their corresponding isomers.
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Tadao Uyehara, Mizue Yuuki, Hiroaki Masaki, Moriji Matsumoto, Masako U ...
1995 Volume 24 Issue 9 Pages
789-790
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Lewis acid-catalyzed reactions of an
N-acylaldimine with allyltriisopropylsilane gave [2+2] azetidine annulation products, while those of an
N-ethoxycarbonylaldimine gave an allylated product.
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Gui-Yang-Sheng Wang, Makoto Kuramoto, Kaoru Yamada, Kazunaga Yazawa, D ...
1995 Volume 24 Issue 9 Pages
791-792
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Homocereulide (
1) and cereulide (
2), isolated from the marine bacterium
Bacillus cereus SCRC, showed extremely potent cytotoxicity. Their structures were elucidated by spectroscopic analysis and chemical degradation.
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Yi Wen Lin, Makoto Ishii, Wataru Ueda, Yutaka Morikawa
1995 Volume 24 Issue 9 Pages
793-794
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Carbon dioxide greatly enhanced the formation rate of acrylonitrile in the gas-phase reaction of acetonitrile with methanol over magnesium oxide catalyst. The reaction in the presence of carbon dioxide was accompanied by the reaction of methanol with carbon dioxide to give carbon monoxide and water. An adsorbed carbon dioxide species on the basic surface of magnesium oxide seems to afford an active methanol-derived species for the reaction with acetonitrile.
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Hiroshi Uyama, Hideharu Kurioka, Shiro Kobayashi
1995 Volume 24 Issue 9 Pages
795-796
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Peroxidase-catalyzed dispersion polymerization of phenols has been performed in a mixture of 1,4-dioxane and phosphate buffer using a water-soluble polymer as stabilizer to produce relatively monodisperse polyphenol particles in the sub-micron range.
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Yoshitane Kojima, Masaaki Watanabe, Yoshio Seki, Kazuhiro Yamato, Hiro ...
1995 Volume 24 Issue 9 Pages
797-798
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A novel chelating reagent,
N,
N′-ethylene-bridged (
S)-histidyl-(
S)-histidine methyl ester, has been synthesized by a one-step reaction of a Schiff-base of (
S)-histidine methyl ester with aqueous glyoxal and sodium cyanoborohydride. Cu(II) complexes of its derivatives also have been synthesized and characterized.
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Kazuhiro Kohori, Hideki Kinoshita, Katsuhiko Inomata
1995 Volume 24 Issue 9 Pages
799-800
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Tosyl group of 3,4-disubstituted 2-tosylpyrroles easily rearranged from 2- to 5-position by treatment with TFA. The ratio of the regioisomers at equilibrium was definitely influenced by the bulkiness of the substituent at 3-position of the starting 2-tosylpyrroles.
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Kazunori Tsushima, Tetsuya Hirade, Hirohiko Hasegawa, Akio Murai
1995 Volume 24 Issue 9 Pages
801-802
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N-Acylated six- or seven-membered lactams were converted effectively into various α-alkylated cyclic enamides
via their corresponding vinyl triflates.
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Bunsho Ohtani, Satoshi Kusakabe, Sei-ichi Nishimoto, Michio Matsumura, ...
1995 Volume 24 Issue 9 Pages
803-804
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Effect of annealing of commercial crystalline CdS powders on their photocatalytic activity and product selectivity was investigated for stereoselective diamino-N-cyclization of 2,6-diaminopimelic acid operated in a deaerated aqueous solution. Surface analyses revealed the formation of sulfur vacancy, which promotes the photoinduced cadmium metal (Cd
0) deposition. The Cd
0, detected by reduction of methylviologen, may act as a reduction site for photoexcited electrons.
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Naotake Sato, Tsutomu Nonaka
1995 Volume 24 Issue 9 Pages
805-806
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An electroactive monolayer of poly(
o-mercaptoaniline) was prepared by electrooxidatively polymerizing
o-mercaptoaniline self-assembled on an Au electrode.
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Mitsuo Kira, Takashi Hoshi, Hideki Sakurai
1995 Volume 24 Issue 9 Pages
807-808
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Intramolecular fluoride-ion donor-acceptor systems such as [
p- and
m-(difluorophenylsilyl)phenyl]trifluorophenylsilicates showed a new mode of fluoride-ion exchange reactions in solution, for which a concerted bimolecular exchange mechanism through cyclophane-like transition states was proposed on the basis of a dynamic
13C NMR analysis of rates and activation parameters.
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Fumio Toda, Hisakazu Miyamoto
1995 Volume 24 Issue 9 Pages
809-810
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When optically active host compound was mixed with achiral guest compound in the solid state, host-guest inclusion crystals were formed by molecular movement and the achiral molecules became arranged in a chiral form in the inclusion crystals. Mixing of powdered (+)-host crystals with powdered (−)-guest crystals which are formed by a chiral arrangement of achiral guest molecules gave inclusion crystals of the (+)-host and the (+)-guest molecules newly produced through an inversion of the (−)-guest molecules during the complexation in the solid state.
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Hideo Suzuki, Nozomu Kenmotu, Ken Tanaka, Hamao Watanabe, Midori Goto
1995 Volume 24 Issue 9 Pages
811-812
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The five-membered ring system, germatetrasilacyclopentane, [R
2Si]
4GePh
2 (
1a: R =
iPr;
1b: R =
tBuCH
2), was synthesized and characterized. Their structures have been determined by X-ray analysis, which showed the Si
4Ge rings of
1a and
1b to be an envelope and half-chair form, respectively. The photolyses of the compounds using a mercury lamp ( λ = 254 nm) were carried out.
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Teruyuki Komatsu, Katsutoshi Ando, Noriyuki Kawai, Hiroyuki Nishide, E ...
1995 Volume 24 Issue 9 Pages
813-814
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2-[8-{N-(2-methylimidazolyl)}octanoyloxymethyl]-5,10,15,20-tetrakis(α,α,α,α-
o-pivalamido)phenylporphinatoiron(II) is incorporated into the human serum albumin, which reversibly forms a stable O
2-adduct under physiological conditions (in aqueous medium, pH 7.4, 37 °C) similar to haemoglobin.
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Soichiro Kyushin, Haruaki Sakurai, Hiroyuki Yamaguchi, Midori Goto, Hi ...
1995 Volume 24 Issue 9 Pages
815-816
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Decaisopropyl-7-oxabicyclo[2.2.1]heptasilane was synthesized by oxidation of decaisopropylbicyclo[2.2.0]hexasilane with
m-chloroperbenzoic acid, and its structure was determined by X-ray crystallography. The compound shows unusual properties in the UV spectrum due to the interaction of the
n orbital of the oxygen atom and the Si-Si σ bonds. The compound also shows far stronger fluorescence than the bicyclic ladder polysilane.
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Kunihiko Akatsuka, Suwaru Hoshi, Takunori Katoh, S. N. Willie, J. W. M ...
1995 Volume 24 Issue 9 Pages
817-818
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A new and practical column separation/preconcentration method for the determination of Pt in environmental samples is proposed. The method has been successfully applied to the determination of Pt in a tunnel dust sample with isotope dilution ICP-MS. A key to its success is an anion-exchange separation of Pt from Hf.
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Genichiro Kura, Junko Ninomiya
1995 Volume 24 Issue 9 Pages
819-820
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Linear phosphates which contain one more P atom in their molecules than the parent phosphates were found in the degradation products of the parent di-, tri- and tetraphosphate under the presence of aluminum(III) ions. These side reactions occurred only during the cleavage reactions of the linear polyphosphates.
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Yoshikazu Makioka, Masumi Tsuno, Ken Takaki, Yuki Taniguchi, Yuzo Fuji ...
1995 Volume 24 Issue 9 Pages
821-822
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Ytterbium and samarium metals promote the coupling reaction of diaryl ketones and thioketones with isocyanides, leading to 2,2-diaryl-2-hydroxyethylideneamines and 2-amino-1,1-diarylethylene, respectively, in fairly good yields.
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Tetsuya Furuike, Norio Nishi, Seiichi Tokura, Shin-Ichiro Nishimura
1995 Volume 24 Issue 9 Pages
823-824
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An efficient method for the first synthesis of novel glycopolymers containing triantennary glycosides of
N-acetyllactosamine [Gal
pβ(1→4)Glc
pNAc] is described. Radical copolymerization of the triantennary glycosides with acrylamide proceeded smoothly in an aqueous solution and gave water-soluble clustered glycopolymers.
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Hiroaki Wasada, Yuko Tsutsui
1995 Volume 24 Issue 9 Pages
825-826
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We studied ligand effects to the pseudorotation of cyclic penta-coordinated phosphorous compounds [PX
3C
4H
8] , X = CH
3, NH
2, OH, F, Cl and H using
ab initio molecular orbital methods. The most stable structures and transition states are characterized. These are fundamental data for the control of reaction occurring in this type of compounds.
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Norihiro Tokitoh, Kuniyuki Kishikawa, Tsuyoshi Matsumoto, Renji Okazak ...
1995 Volume 24 Issue 9 Pages
827-828
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Thermolysis of overcrowded 2,3-diphenylgermirenes bearing bulky substituents on the germanium atom in benzene affords the corresponding kinetically stabilized germylenes, the efficient formation of which is evidenced by the trapping experiments with 2,3-dimethyl-1,3-butadiene. This provides a new and mild method for the generation of germylenes.
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Yoshio Ishino, Hirofumi Maekawa, Hiroshi Takeuchi, Kazuaki Sukata, Iku ...
1995 Volume 24 Issue 9 Pages
829-830
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Mg-promoted cross-coupling of aromatic carbonyl compounds with trimethylsilyl chloride (TMSCl) in DMF at room temperature brought about reductive carbon-silicon bond formation to give the corresponding α-trimethylsilylalkyl trimethylsilyl ethers selectively in good yields. The reaction may be initiated through electron transfer from Mg metal to the carbonyl compounds.
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Kazuya Kobiro, Mayumi Kaji, Sachiko Tsuzuki, Yoshito Tobe, Yuko Tuchiy ...
1995 Volume 24 Issue 9 Pages
831-832
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Cis- and
trans-2-phenylcyclohexano-14-crown-4 and
cis- and
trans-2,3-diphenylcyclohexano-14-crown-4 were prepared and their ion selectivity was determined by means of extraction of alkali metal picrates, stability constants, and ion-selective electrodes. Cis diphenyl derivative exhibits the highest lithium ion-selectivity of the four ionophores examined, which is as high as that of decalino-14-crown-4, one of the best Li
+-selective ionophores.
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Yasutaka Kataoka, Yoshinori Saito, Koji Nagata, Kenichi Kitamura, Atsu ...
1995 Volume 24 Issue 9 Pages
833-834
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The first optically active cyclopentadienyl-phosphine bidentate ligands ([Cp-P]H ligands) in which a diphenylphosphino group and a cyclopentadienyl or an indenyl group are connected by an
L-threitol derivative or an (
S,
S)-
trans-1,2-dimethylenecyclo-pentane group have been prepared. The rhodium and ruthenium complexes of their anions have been prepared and characterized.
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Kazunari Hashizume, Naoto Hashimoto, David G. Cork, Yoshihiro Miyake
1995 Volume 24 Issue 9 Pages
835-836
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The relative efficacy of aromatic fluorine-for-halogen (F–X) exchange reactions was found to be F–F > F–Cl > F–Br > F–I in a [
18F]fluoride-cryptand-oxalate system using 4′-halo-acetophenones (F, Cl, Br and I), key intermediates for many
18F-radiopharmaceuticals. Efficient
18F-labelling reaction and a new chromatographic separation method has enabled the potential of F-for-X exchange (X = Cl and F) to be realized for the high yield synthesis of high purity [
18F]-neuroleptics.
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Masatoshi Hirayama, Toshitaka Terasaka, Manabu Itasaka, Takanori Suzuk ...
1995 Volume 24 Issue 9 Pages
837-838
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The anion and trianion radicals of title compounds were generated by electrolysis in acetonitrile at room temperature and their ESR spectra were measured, which can be identified on the basis of π-MO calculations of hfsc’s.
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Masahiro Fujiwara, Hisanori Ando, Masami Matsumoto, Yasuyuki Matsumura ...
1995 Volume 24 Issue 9 Pages
839-840
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The hydrogenation of carbon dioxide was studied over the composite catalysts comprised of Fe catalysts and HY zeolite. In the case of Fe-ZnO/HY, the distribution of hydrocarbons showed that hydrocarbons were obtained by methanol to gasoline reaction, not by Fischer-Tropsch reaction.
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Nobuaki Negishi, Tomokazu Iyoda, Kazuhito Hashimoto, Akira Fujishima
1995 Volume 24 Issue 9 Pages
841-842
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Transparent TiO
2 thin films with high photocatalytic activity were prepared on glass substrates via the sol-gel method from tetraisopropyl titanium ethanol solution containing polyethylene glycol and diethylene glycol. Transparency of these TiO
2 thin films was 80% in the visible region. Photocatalytic activity of the TiO
2 thin films was studied using the decomposition of gaseous acetaldehyde. We found that the quantum yield with those films was similar to that with one of the most photoactive commercial TiO
2 powders, Degussa P-25.
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Masaru Tada, Katsuyuki Kaneko
1995 Volume 24 Issue 9 Pages
843-844
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The 1,2-rearrangement of an (alkylthio)carbonyl group and the radical substitution on sulfur are stimulated by the coexisting cobalt(II) complex, generated intermolecularly or intramolecularly.
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Keiji Okada, Katsura Okubo, Masaji Oda, Hisao Murai
1995 Volume 24 Issue 9 Pages
845-846
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Irradiation of hindered phenols in the presence of acridine as a light absorber gives bisphenols and biacridane. CIDEP study establishes the path of hydrogen abstraction by the triplet acridine. The overall mechanism is proposed by the product analysis and the CIDEP studies.
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Taketoshi Nakao, Yoshinori Kobayashi, Hisao Wakabayashi, Kenji Takaich ...
1995 Volume 24 Issue 9 Pages
847-848
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Constant-pressure molar specific heat and entropy of 1,1,1,2-tetrafluoroethane at several temperatures were calculated by adopting
ab initio molecular orbital theory and utilizing a double split valence type basis set. The calculated values for temperatures between −20.0 and 100.0 °C and a constant pressure of 101.3 kPa showed agreement with experimental results within 0.8 Jmol
−1K
−1 for entropy and within 3.3 Jmol
−1K
−1 for constant-pressure molar specific heat in the temperatures. However, some modification to the present approach is necessary for evaluating the pressure dependence of constant-pressure molar specific heat.
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Masayasu Akiyama, Tsuyoshi Ikeda
1995 Volume 24 Issue 9 Pages
849-850
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An enantiomeric pair of triscatecholate ligands have been prepared as a model for siderophore enterobactin, using protected derivatives of
L- or
D-lysine, 1,2-diaminoethane and 2,3-dihydroxybenzoic acid. The ligands have greater chemical stability and higher water solubility than enterobactin, and form chiral complexes with iron(III), as enterobactin does.
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Kazuhiko Takai, Masashi Yamada, Kiitiro Utimoto
1995 Volume 24 Issue 9 Pages
851-852
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Tantalum-alkyne complexes prepared from internal acetylenes and low-valent tantalum (TaCl
5 and Zn) in DME and benzene react with terminal diynes in the presence of THF and pyridine to give tetrasubstituted benzene derivatives in good to excellent yields.
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