-
Yuriko Abe, Kyoko Shinguhara, Shigenobu Yano
1992 Volume 21 Issue 6 Pages
897-900
Published: 1992
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Reactions of N,N′-ethylenenbis(salicylideneiminato)cobalt(II), Co(salen), and its ring-substituted analogues with Fe
2+ ion under nitrogen atmosphere in dimethyl sulfoxide readily afforded hetero-metal binuclear Co(II)-Fe(II)-Schiff base complexes, which have much higher uptake for dioxygen than do only the Co(II) Schiff base complexes.
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Takashi Komori, Seiji Shinkai
1992 Volume 21 Issue 6 Pages
901-904
Published: 1992
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O-Methylated calix[n]arenas (n = 4, 6, and 8) coupled to C
6H
4-p-C
mH
2m+1 (m = 8, 12, 14, and 16) via an azomethine linkage were synthesized. It was found that some of them show stable flow birefringence or readily form stable liquid crystals.
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Tetsu Yamakawa, Toshio Fujita, Sumio Shinoda
1992 Volume 21 Issue 6 Pages
905-908
Published: 1992
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Neutral five-coordinated platinum(II) complexes ([Pt(SnCl
3)
2(P(OR)
3)
3]; R = Me, Et) with high solubility to hydrocarbon solvents have been newly synthesized. The characteristic ligand composition (all π-acceptor ligands) gives the Pt(II) center both enhanced electrophilicity and stability against reduction, due to which thermal (non-photolytic) catalytic dehydrogenation of cyclooctane in homogeneous solutions was achieved under mild reaction conditions, including electrophilic C-H bond activation.
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Yukito Murakami, Yoshio Hisaeda, Hiroshi Kohno, Teruhisa Ohno
1992 Volume 21 Issue 6 Pages
909-912
Published: 1992
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The enantioselective alkylation of hydrophobia vitamin B
12 derivatives at the β-axial site was examined in methanol with various alkyl bromides, and those B
12 analogues bearing a peripheral binaphthyl moiety showed the highest S-selectivity toward enantiomeric alkyl bromides among vitamin B
12 models as caused by a steric effect of the peripheral substituent.
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Hiroshi Shimomura, Seiko Komorita, Hiro Kuma, Yoshihiko Kushi
1992 Volume 21 Issue 6 Pages
913-914
Published: 1992
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Both
trans-[Pd(succim)
2(
R-phenea)(
S-phenea)] and
trans-[Pd(Succim)
2(
S-phenea)
2] (succim = succinimidate, phenea = 1-phenylethylamine) were prepared and their crystal structures were determined by X-ray analysis. Three different
staggered rotamers around N-C bond of the phenea ligands have been found.
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Yoshimitsu Nagao, Shigeki Sano, Satoshi Nakagawa, Miho Tanaka, Motoo S ...
1992 Volume 21 Issue 6 Pages
915-918
Published: 1992
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Systematic characterization of several molecules, adopting a folded conformation with stacked aromatic moieties, is investigated by utilizing X-ray crystallographic and
1H NMR analyses. Bridging two aromatic moieties with a sulfonic ester bond proved to be a significant factor for adopting a folded conformation.
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Hide Kambayashi, Masami Nakamoto, Shie-Ming Peng, Hirotaka Nagao, Koji ...
1992 Volume 21 Issue 6 Pages
919-922
Published: 1992
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Stability of superoxidized form of [Fe
4S
4(SAd)
4]
2− (AdS
−: 1-adamantanethiolate) in DMF, H
2O/DMF, and aqueous poly[2-(dimethylamino)hexanamide] (PDAH) solutions is discussed in connection with the crystal structure of (Ph
4As)
2[Fe
4S
4(SAd)
4].
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Koji Chiba, Hideyuki Tagaya, Syunji Miura, Masa Karasu
1992 Volume 21 Issue 6 Pages
923-926
Published: 1992
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Active methylene compounds were carboxylated with the reagent system, 18-crown-6, potassium carbonate and carbon dioxide, in dimethyl sulfoxide at room temperature and atmospheric presssure. The concentration of the carbonate ion is important for carboxylation.
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Yoshinori Nagase, Hironobu Nakamura, Yutaka Yazawa, Takako Imamoto
1992 Volume 21 Issue 6 Pages
927-928
Published: 1992
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The liquid-phase hydrogenation of crotonaldehyde has been investigated over silver-manganese oxide catalyst. The selectivity to 2-buten-1-ol was 71.8% at a conversion of crotonaldehyde of 85.1%.
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Carl S. Jone, Masaharu Kamo, Mitsuru Sano, Akira Tsugita
1992 Volume 21 Issue 6 Pages
929-932
Published: 1992
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2-Anilino-5-thiazolinone amino acids, intermediates of Edman degradation, were reacted with 1-trifluoro-2-amino-ethane in vapor phase. The products were analysed by gas chromatography using an electron capture detector. The reaction was quantitative and capable of being used for micro amount of protein because the large excess of gas phase reagent was easily removed after the reaction. Sensitivity of detection of the reaction product was about 50 femtomole.
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Masayuki Fujii
1992 Volume 21 Issue 6 Pages
933-934
Published: 1992
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Condensation of 1-nitroalkanephosphonates with carbonyl compounds affords a new and facile method for the preparation of conjugated nitro olefins.
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Hideo Hosaka, Hiroyuki Nakamura, Hidenori Funakoshi, Hiroshi Takaku
1992 Volume 21 Issue 6 Pages
935-938
Published: 1992
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The
O-bis(1,1,1,3,3,3-hexa-fluoro-2-propyl) deoxyribonucleosid-3′-yl phosphite units could be converted into the
O-nucleosid-3′-yl phosphonate,
O-2-cyanoethyl
O-nucleosid-3′-yl phosphonate, and
O-1,1,1,3,3,3-hexafluoro-2-propyl
O-nucleosid-3′-yl phosphonothioate. The phosphite unit reacted with 3′-
O-benzoylthymidine in the presence of MeIm to give the dithymidylate derivatives.
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Enju Wang, Kousaburo Ohashi, Satsuo Kamata
1992 Volume 21 Issue 6 Pages
939-942
Published: 1992
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Optical properties of poly(vinyl chloride) (PVC) membrane incorporated with chromophore quinoline derivative were studied. The absorbance of the sensor increased with OH
− concentration (0.001–1 mol dm
−3) at 613 nm; and with Cu
2+ concentration (5 × 10
−6 – 10
−3 mol dm
−3) at 580 nm due to deprotonation and complexation with Cu
2+ ions.
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Tatsumi Ishihara, Keiji Sato, Yukako Mizuhara, Yusaku Takita
1992 Volume 21 Issue 6 Pages
943-946
Published: 1992
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The electrophoretic deposition (EPD) method was applied for the preparation of yttria-stabilized zirconia (YSZ) films for a solid oxide fuel cell (SOFC). Dense YSZ films with uniform thickness can be readily prepared by EPD method. When the planar SOFC was fabricated by using La
0.6Sr
0.4MnO
3 as a cathode and electroless plating Pt as an anode, the open circuit voltage and the maximum power density attained were 1.03 V and 1.87 Wcm
−2, respectively.
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Hiroki Kuwabara, Toshio Okuhara, Makoto Misono
1992 Volume 21 Issue 6 Pages
947-950
Published: 1992
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Copper-exchanged zeolites catalyzed the oxidative decomposition of (CH
3)
3N to N
2, CO
2, and H
2O. The selectivity to N
2 was 92% and the formation of NOx was less than 5 ppm, when 8000 ppm of (CH
3)
3N with O
2 (20%) was flowed over copper-exchanged Y zeolite at 573 K.
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Kaoru Nakamura, Satoshi Takano, Kumi Terada, Atsuyoshi Ohno
1992 Volume 21 Issue 6 Pages
951-954
Published: 1992
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The rate of asymmetric reduction of butyl pyruvate catalyzed by glycerol dehydrogenase is largely enhanced when the enzyme system is immobilized by a water-adsorbent polymer and the reaction is run in an organic solvent with cooperation of cyclopentanol as a reducing reagent.
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Emiko Kaneko, Hitoshi Hoshino, Takao Yotsuyanagi
1992 Volume 21 Issue 6 Pages
955-958
Published: 1992
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A new effective and simple method has been developed to concentrate trace analytes from the organic phase after conventional extraction. Micro volume of high boiling-point water miscible solvent (solvent A), such as dimethylsulfoxide, is added to the separated organic phase and the low boiling-point organic solvent (solvent B), such as chroloform, is removed by evaporation to concentrate the analytes in the solvent A. This method has been successfully applied to the ion-pair solvent extraction system of cobalt with 2,2′-dihydroxyazobenzene as a powerful preconcentration technique for reversed-phase high-performance liquid chromatography of the metal chelates. The detection limit is 6 × 10
−10 mol dm
−3.
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Nobuo Tanaka, Tetsuya Tanigawa, Ken Hosoya, Kazuhiro Kimata, Takeo Ara ...
1992 Volume 21 Issue 6 Pages
959-962
Published: 1992
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Starburst dendrimers (SBDs) were shown to be useful as carriers in electrokinetic chromatography in aqueous and aqueous-organic systems. Uncharged aromatic compounds were separated under electrophoretic conditions based on the differential binding to the SBDs. The separation was influenced by the size and ionization state of SBDs as well as the organic solvent content of the aqueous phase.
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Tadahiro Motomura, Katsumi Araki, Kenji Kobayashi, Hiroo Toi, Yasuhiro ...
1992 Volume 21 Issue 6 Pages
963-966
Published: 1992
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Bisresorcinol derivatives having an imidazolyl or an aminoalkyl group as a metal-ion binding site promotes an oxidative strand-scission of supercoiled φX-174 plasmid DNA in water at pH 7.4 in the presence of Cu
II. The essential role of the intramolecular bisresorcinol moiety is to reduce amine-coordinated Cu
II ion. The resulting Cu
I then reacts with O
2 to give reactive oxygen species capable of oxidative DNA degradation.
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Hideaki Fujii, Koichiro Oshima, Kiitiro Utimoto
1992 Volume 21 Issue 6 Pages
967-970
Published: 1992
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erythro-α,β-Epoxy alcohols were prepared with high stereoselectivity by sodium borohydride reduction of the corresponding α,β-epoxy ketones in the presence of calcium chloride or manganese(II) chloride regardless of the substituents on the epoxide ring.
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Chuichi Hirayama, Hirotaka Ihara, Shoji Nagaoka, Tadayoshi Syono
1992 Volume 21 Issue 6 Pages
971-974
Published: 1992
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Poly(γ-methyl L-glutamate) spherical particles having micropores showed higher retention capacity for
n-isomers of alcohols (with remarkable temperature dependencies) than for
tert-isomers in the aqueous liquid chromatography. No similar temperature dependence was observed for either spherical particles having macropores or alkyl-bonded silica gels.
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Masaru Hashimoto, Kaoru Yamada, Shiro Terashima
1992 Volume 21 Issue 6 Pages
975-978
Published: 1992
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Enantiomeric pairs of the title compounds were synthesized starting from (
S)-and (
R)-pyroglutamic acid. They were found to be susceptible to nucleophilic ring opening of aziridine moieties and to exhibit weak
in vitro cytotoxicity.
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Maorong Chai, Masato Machida, Koichi Eguchi, Hiromichi Arai
1992 Volume 21 Issue 6 Pages
979-982
Published: 1992
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Hydrogen gas permeation through sol-gel derived microporous alumina membranes was strongly promoted in the presence of metal particles highly dispersed in the pore structure. The separation factor of hydrogen for ruthenium-dispersed membranes exceeded the limitation of the Knudsen diffusion mechanism.
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Kou Nakata, Tadashi Yamaguchi, Yoichi Sasaki, Tasuku Ito
1992 Volume 21 Issue 6 Pages
983-986
Published: 1992
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[Mo
3(μ
3-CCH
3)(μ
3-O)(μ-CH
3COO)
6(H
2O)
3]
+ undergoes bridging acetates substitution with benzoate ions in CH
3OH-CH
3CN mixed solvent to give [Mo
3(μ
3-CCH
3)(μ
3-O)(μ-C
6H
5COO)
6(CH
3OH)
3]
+, which can never be synthesized in principle by the conventional direct method.
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Shuichi Ôi, Sotaro Miyano
1992 Volume 21 Issue 6 Pages
987-990
Published: 1992
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Homochiral (
S)-[10]paracyclophane-13-carboxylic acid ((
S)-
1) could conveniently be obtained on a preparative scale via fractional crystallization of the (
S)-1-phenylethylamide diastereomers. (
S)-
1 was used for the first time as a stereodifferentiating element with planar chirality for a new chiral stationary phase (CSP) for HPLC. The CSP, which was prepared by bonding (
S)-
1 to γ-aminopropylsilanized silica gel via amide linkage, recognized a wide range of enantiomers by HPLC.
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Tadao Ishizuka, Koreichi Kimura, Seigo Ishibuchi, Takehisa Kunieda
1992 Volume 21 Issue 6 Pages
991-994
Published: 1992
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A versatile and practical route to both enantiomers of a wide variety of 4-substituted 2-oxazolidinones from the parent heterocycle is provided by regioselective substitutions via 4-methoxy derivative followed by chromatographic separation of the diastereomers derived from N-2-
exo-methoxy-1-apocamphanecarbonylation.
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Yuki Fujii, Hajime Maie, Seiko Kumagai, Toshihiro Sugai
1992 Volume 21 Issue 6 Pages
995-998
Published: 1992
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A new chelating resin bearing 2-acetylphenol ligand was synthesized by the copolymerization of 2-acetyl-5-(p-vinylbenzyloxy)phenol, acrylamide, and methylenediacrylamide. The resin adsorbed rapidly Pd(II) [pH 1–2.5] and Cu(II) [pH 3.5–6] with a high selectivity, and the adsorption ability was promoted by the application of template synthesis method.
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Koji Kondo, Futoshi Ishikawa, Nobumasa Ishida, Masahiro Irie
1992 Volume 21 Issue 6 Pages
999-1002
Published: 1992
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Selective seeding of palladium catalysts on an alumina plate for electroless copper plating was made by photoirradiation. The adsorbed Pd(II)-tartrate were selectively converted to Pd(0) by photoirradiation and the photogenerated Pd(0) catalyzed the electroless copper plating.
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Takakazu Yamamoto, Masaki Shimura, Kohtaro Osakada, Kenji Kubota
1992 Volume 21 Issue 6 Pages
1003-1004
Published: 1992
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Dehalogenation copolymerization of 2,5-dibromothiophene and 2,5-dibromopyridine with zero-valent nickel complex gives random copolymers with molecular weight of 5 × 10
4–5 × 10
6. They show unique doping-undoping cycles which are accounted for by shift of lone pair electron of pyridine ring to p-doped thiophene ring.
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Yutaka Nakamura, Chung-gi Shin, Kazuyuki Umemura, Juji Yoshimura
1992 Volume 21 Issue 6 Pages
1005-1008
Published: 1992
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The convenient syntheses of various thiazole α-dehydroamino acids, thiazole valine ethyl ester, and their dehydrodiand tripeptides, which are important moieties and segment of micrococcin P
1 and noshiheptide, macrocyclic peptide antibiotics, were first accomplished.
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Seiji Okamoto, Hiroyasu Nishiguchi, Masakazu Anpo
1992 Volume 21 Issue 6 Pages
1009-1012
Published: 1992
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Benzophenone adsorbed on the cation-exchanged ZSM-5 zeolite was found to exist as a protonated form and a hydrogen-bonded form. The exchanged cations had a serious effect on the ratio of those concentrations. Both Benzhydrol and benzpinacol were observed as the major products of the photolysis of the system, their yields strongly depending on the kind of the exchanged cations. The protonated species play a significant role on the photoreactions of benzophenone adsorbed on the zeolite.
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Jun Kawakami, Michiko Iwamura, Junko Nakamura
1992 Volume 21 Issue 6 Pages
1013-1016
Published: 1992
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β-(1-Pyrenyl)ethyl p-cyanobenzoate (
P2CN) which forms an emissive intramolecular exciplex has a “folded” conformation as detected by
1H-NMR NOE. Precise decay lifetime analysis also confirms that the exciplex emission is mainly from that conformer. Exciplex emission was not observed for the p-chlorobenzoate (
P2Cl) which did not show NOE.
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Bunji Uno, Atsushi Kawabata, Kenji Kano
1992 Volume 21 Issue 6 Pages
1017-1020
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Formation constants of two-point hydrogen-bonded complexes of
p-quinone dianions with CH
3OH (1:2) have been successfully determined to be of the order of 10
4 dm
6 mol
−2. The origin of high reactivity of the dianions toward proton donors has been clarified experimentally and theoretically.
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Hiroshi Sakiyama, Ken-ichi Tokuyama, Jun Nishio, Naohide Matsumoto, Hi ...
1992 Volume 21 Issue 6 Pages
1021-1024
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A new tetranucleating macrocycle (H
2L) comprised of 2,6-diformyl-4-methylphenol and 1,8-diamino-3,6-dimethyl-3,6-diazaoctane in the 2:2 ratio was obtained as a lead(II) complex of the formula Pb
2(H
2L)(dmf)
4(ClO
4)
4, whose crystal structure was determined by X-ray method.
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Katsunori Yogo, Satoru Tanaka, Michito Ihara, Tatsuya Hishiki, Eiichi ...
1992 Volume 21 Issue 6 Pages
1025-1028
Published: 1992
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The reduction of NO with propane in the presence of excess oxygen was investigated using gallium ion-exchanged zeolite catalysts, among which ferrierite(Ga-ferrierite) and ZSM-5(Ga-ZSM-5) showed high activity in a wide range of reaction temperature.
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Kenkichi Sakamoto, Junji Abe, Hideki Sakurai
1992 Volume 21 Issue 6 Pages
1029-1032
Published: 1992
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Irradiation of 2-pentamethyldisilanyl-2-cyclohexenone in a
t-butyl alcoholbenzene mixed solvent gave 2-
t-butoxydimethylsilyl-3-trimethylsilyloxycyclohexene and 1-trimethylsilyloxy-2-(
t-butoxydimethylsilyl)cyclohexene. Silatrimethylenemethane was detected by UV and ESR spectra. Irradiation of 2-pentamethyldisilanyl-3-methyl-2-cyclohexenone afforded 1-trimethylsilyloxy-3-methyl-3-(
t-butyldimethylsilyl)hexene through methylenesilacyclopropane.
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Youichi Shimizu, Haruyuki Matsuda, Norio Miura, Noboru Yamazoe
1992 Volume 21 Issue 6 Pages
1033-1036
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Gas-diffusion electrodes loaded with large surface area perovskite-type oxides, La
0.6Ca
0.4Co
0.8B′
0.2O
3 (B′ = Mn, Fe, Co, Ni, Cu), were examined for the electro-chemical reduction and evolution of oxygen in 7 M KOH at 25 °C. The oxide with B′ = Fe gave the highest bi-functional performances, i.e., 200 mA/cm
2 for the oxygen reduction in air and 300 mA/cm
2 for the oxygen evolution at −150 and +620 mV vs. Hg/HgO, respectively, owing to its high catalytic activity for the decomposion of the HO
2− intermediate.
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Masayuki Shirai, Kiyotaka Asakura, Yasuhiro Iwasawa
1992 Volume 21 Issue 6 Pages
1037-1040
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Cu oxides were supported on α-quartz(0001) by CVD of Cu(DPM)
2 (DPM: dipyvaloylmethanate) and the subsequent calcination. The structure of the Cu species in the submonolayer was determined by polarized total-reflection fluorescence extended X-ray absorption fine structure (EXAFS) spectroscopy. Both s- and p-polarized EXAFS data revealed that Cu atoms were dispersed in a monomer form on the three-fold hollow sites of the quartz surface with the Cu-O distance of 0.201 nm.
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Teruaki Mukaiyama, Koki Matsubara
1992 Volume 21 Issue 6 Pages
1041-1044
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1,2-trans-Ribofuranosides are stereoselectively synthesized from 1-O-trimethylsilyl ribofuranose and trimethylsilyl ethers in the presence of a catalytic amount of Me
3SiOTf using Ph
2Sn=S as an additive, while 1,2-cis-ribofuranosides and 1,2-cis-glucopyranosides are prepared predominantly in the coexistence of LiClO
4 in the above reaction.
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Hajime Nagano, Hiroe Yasui
1992 Volume 21 Issue 6 Pages
1045-1048
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(+)-Boronolide (= (1′
R,2′
R,3′
S,6
R)-5,6-dihydro-6-[1′,2′,3′-tris(acetoxy)heptyl]-2
H-pyran-2-one) (
1), a constituent isolated from
Tetradenia fruticosa and
T. barberae (Lamiaceae), was synthesized in 7 steps and in 5.2% overall yield from 2,3,4,5,6-penta-
O-benzyl-
D-glucose, whose four asymmetric centers were incorporated in
1.
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Akira Izuoka, Tatsuya Tachikawa, Tadashi Sugawara, Yahachi Saito, Hisa ...
1992 Volume 21 Issue 6 Pages
1049-1052
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Buckminsterfullerene (C
60) was found to form single crystals of an inclusion complex with a double ethylene-bridged donor, a CT absorption band being observed in its UV spectrum. Crystal structure of the complex is characterized by two one-dimensional arrays of C
60’s with van der Waals contacts.
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Masaaki Yoshifuji, Hajime Kawanami, Yoshinori Kawai, Kozo Toyota, Masa ...
1992 Volume 21 Issue 6 Pages
1053-1056
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2-(2,4,6-Tri-
t-butylphenyl)-1-phosphaethyne was prepared from 2,2-dichloro-1-(2,4,6-tri-
t-butylphenyl)-1-phosphaethene by lithiation of
anti-chloro atom followed by hydrolysis, photoisomerization, and repeated lithiation involving migration. The present method was successfully applied to the preparation of 2-(2,4,6-tri-
t-pentylphenyl)-1-phosphaethyne.
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Tatsuya Kawamoto, Yoshihiko Kushi
1992 Volume 21 Issue 6 Pages
1057-1058
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2-(1-Naphthyl)benzothiazoline, 1-nabz, reacts with palladium(II) acetate to yield, in addition to the expected bis[2-
N-(1-naphthylmethylideneamine)benzenethiolato]palladium(II), a minor by-product tetrakis[2-
N-(1-naphtylmethylideneamine)benzenethiolato-
Co,
N,
S]tetrapalladium(II) (
2) of composition C
68H
44N
4Pd
4S
4; the novel structure of
2 is established by X-ray diffraction.
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Shizuko Ambe, Shao Yong Chen, Yoshitaka Ohkubo, Yoshio Kobayashi, Masa ...
1992 Volume 21 Issue 6 Pages
1059-1062
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The radioactive multitracer technique was applied to a study of adsorption of metal ions on α-Fe
2O
3 from aqueous solutions. The pH dependence of the adsorption of the elements, Sc, Ga, As(V), Se(IV), Rb, Sr, Y, Zr, Nb, and Mo(VI), was simultaneously determined using a multitracer solution separated from an Ag target irradiated by a 135 MeV/nucleon
12C beam available from the RIKEN Ring Cyclotron. Characteristic adsorption behavior of each element was determined under strictly identical experimental conditions.
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Kunihiro Ichimura, Yuko Hayashi, Norio Ishizuki
1992 Volume 21 Issue 6 Pages
1063-1066
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Azimuthal anisotropy of a nematic liquid crystal alignment was caused by exposing 6-nitrospirobenzopyran monolayer to linearly polarized UV light. The photo-induced in-plane alignment was scarcely altered after prolonged storage at an ambient temperature.
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Takayoshi Suzuki, Junnosuke Fujita
1992 Volume 21 Issue 6 Pages
1067-1068
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Dinuclear Pd(I) and Pt(I) complexes bridged by (dimethylphosphinomethyl)dimethylamine (mm-pcn), [M
2Cl
2{μ-(mm-pcn)}
2], were prepared. X-Ray crystal structure analysis revealed that the Pd complex is a head-to-tail isomer in which the two coordination planes around Pd are coplanar.
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Tsutomu Takeichi, Sigeru Shimura, Hisashi Toriyama, Yuzi Takayama, Mas ...
1992 Volume 21 Issue 6 Pages
1069-1072
Published: 1992
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Three kinds of novel chiral stationary phases for capillary gas chromatography,heptakis(2,6-di-
O-pentyl)-β-cyclodextrin hepta(3-n-propyl, 3-isopropyl, and 3-phenylcarbamate), were prepared. Metal capillary columns coated with the stationary phases showed impressive enantioseparation toward many kinds of racemic compounds.
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Makoto Hojo, Masakazu Ohkuma, Akira Hosomi
1992 Volume 21 Issue 6 Pages
1073-1076
Published: 1992
Released on J-STAGE: May 02, 2006
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Alkoxymethylthiomethylsilanes, easily prepared, react nucleophilically with aldehydes by the action of fluoride ion and electrophilically with silyl enol ethers in the presence of a Lewis acid. These products can be converted to 1,3-oxathiolanes by acid catalysis and tetrahydrothiophenes by fluoride ion-promoted intramolecular alkylthiomethylation, respectively. By both sequential reactions alkoxymethylthiomethylsilanes serve as substituted thiocarbonyl ylide synthons.
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Kazuhiko Naitoh, Takahisa Oguchi, Ryoichi Nakagaki, Tatsuo Arai, Hiroc ...
1992 Volume 21 Issue 6 Pages
1077-1080
Published: 1992
Released on J-STAGE: May 02, 2006
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The external magnetic field effect as well as laser flash photolysis was employed to estimate the contribution of ion radical pairs to isomerization of
trans-2-(3,3-dimethyl-1-butenyl)naphthalene (
t-BN) in the presence of an electron acceptor in various solvents. The precursor of isomerization,
t-BN triplet, was produced most efficiently almost through an exciplex in chloroform (ε = 4.8) among the employed solvents.
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Masaaki Mishima, Takahiro Terasaki, Mizue Fujio, Yuho Tsuno, Yoshio Ta ...
1992 Volume 21 Issue 6 Pages
1081-1084
Published: 1992
Released on J-STAGE: May 02, 2006
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Gas phase basicities of pyridine N-oxides were determined by means of a pulsed ICR spectrometer. It has been shown that the resonance demand for π-acceptors is intrinsically greater in pyridine N-oxide than in pyridine and that the attenuation of substituent effect owing to solvation stabilization is more significant in the former system.
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