-
Huihua Deng, Ming Li, Yu Zhang, Zuhong Lu, Degang Fu
1997 Volume 26 Issue 6 Pages
483-484
Published: 1997
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The CdS nanoparticles capped with 2,2′-bipyridine (bpy) had been synthesized in AOT reverse micelle. Bpy molecules adsorb on the Cd
2+-rich surface of the CdS cluster via the nitrogen σ donation, which was elucidated by the FT-Raman spectroscopy. AOT exists as an anion ion of AOTSO
3− in the CdS/bpy composite.
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Hiroshi Nakajima, Kiyoshi Tsuge, Koji Tanaka
1997 Volume 26 Issue 6 Pages
485-486
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The unprecedented oxide transfer reaction from CO
32− to the carbonyl complex, [Ru(bpy)
2(CO)
2]
2+ in aprotic media is described. The oxide transfer proceeds via the 1:1 adduct formation, to afford Ru(bpy)
2(CO)(η
1-CO
2) and CO
2.
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Tadashi Ema, Shigeharu Misawa, Shuichi Nemugaki, Takashi Sakai, Masano ...
1997 Volume 26 Issue 6 Pages
487-488
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Optically active dimeric porphyrin covalently linked by a chiral cyclophane was synthesized; the two porphyrin chromophores were disposed in a slipped cofacial fashion, which was found to be tunable by cooperative coordination of diamines with various chain lengths.
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Junichi Tanaka, Irvina Nurrachmi, Tatsuo Higa
1997 Volume 26 Issue 6 Pages
489-490
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A new diterpene, umabanol, has been isolated from the sponge
Epipolasis kushimotoensis and its structure determined by spectroscopic analysis. Umabanol possesses a new tetracyclic ring system related to verrucosane class diterpenes.
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Norimasa Yoza, Sumie Onoue, Yoshie Kuwahara
1997 Volume 26 Issue 6 Pages
491-492
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Alkaline phosphatase(EC3.1.3.1) catalyzed the hydrolyses of inorganic diphosphate(pyrophosphate) and triphosphate. The rate of P-O-P bond cleavage decreased with increasing pH at alkaline region, in contrast to the pH-dependencies of P-O-C and P-F bond cleavages. The enzyme was inactive toward cyclic triphosphate and, unlike well-known inorganic pyrophosphatase(EC3.6.1.1), was not inhibited by fluoride ion.
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Kiyoaki D. Sugi, Takushi Nagata, Tohru Yamada, Teruaki Mukaiyama
1997 Volume 26 Issue 6 Pages
493-494
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The enantioselective borohydride reduction using optically active cobalt(II) complex catalysts was successfully applied to various aryl
N-diphenylphosphinyl imines, and the corresponding reduced products were obtained in good yields with high enantiomeric excesses (up to 99% ee). The optically active primary amines were obtained by the successive hydrolysis under mild conditions.
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Taehee Noh, Heejun Lim
1997 Volume 26 Issue 6 Pages
495-496
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Irradiation of methyl 9-anthroate through a Uranium filter gave the 1,4-10′,9′ and 1,4-9′,10′ cyclodimers as well as the 9,10-10′,9′ cyclodimer; this is the first example of intermolecular photodimerization involving the 1,4,9′, and 10′ positions of
meso-substituted anthracenes. These dissymmetrical cyclodimers were found to be thermally more labile than the 9,10-10′,9′ cyclodimer.
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Masahiko Nagaki, Tanetoshi Koyama, Tokuzo Nishino, Kanako Shimizu, Yuj ...
1997 Volume 26 Issue 6 Pages
497-498
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Desmethyl homologs of dimethylallyl diphosphate and of isopentenyl diphosphate were examined for the reactivity as substrates for the thermostable farnesyl diphosphate synthase of
Bacillus stearothermophilus.
E-But-2-enyl diphosphate was not accepted as a substrate at all, but but-3-enyl diphosphate reacted with dimethylallyl- and geranyl diphosphates to give norgeranyl- and norfarnesyl diphosphates, respectively, which lack methyl groups at the 3-positions.
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Juzo Nakayama, Ting Yu, Yoshiaki Sugihara, Akihiko Ishii
1997 Volume 26 Issue 6 Pages
499-500
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Oxidation of 3,4-di-
t-butyl- and 3,4-di-1-adamantyl-, and 2,4-di-
t-butylthiophenes with an equimolar amount of
m-chloroperbenzoic acid in the presence of BF
3•Et
2O gave the corresponding thiophene 1-oxides in good yields, which are stable enough to be isolated in pure crystalline form. An X-ray single crystal structure analysis led to the conclusion that thiophene 1-oxides would not be aromatic.
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Kazuhiko Tanaka, Takuji Kume, Tadashi Takimoto, Yoshinori Kitahara, Hi ...
1997 Volume 26 Issue 6 Pages
501-502
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Photocyclization of 2,7-bis[3-(
t-butyldimethylsilyloxy)phenylvinylene]benzo[1,2-b:4,3-b′]dithiophene affords three regioisomers of the bis(silyloxy)[7]thiaheterohelicenes together with the unexpected 4-phenyl-substituted [7]thiaheterohelicene. Cleavage of the silyl ethers gave the helical quinone, which includes ethanol as guest molecules to form a 1:1 inclusion complex.
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Kazuhiro Kobayashi, Hideki Akamatsu, Susumu Irisawa, Masaki Takahashi, ...
1997 Volume 26 Issue 6 Pages
503-504
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The title amino acid derivatives have been prepared in two steps from 3-alkoxy-1-isocyanopropenes. The key step is the alkoxycarbonylation of 3-alkoxy-1-isocyano-1-lithiopropenes with alkyl chloroformates to afford the corresponding 4-alkoxy-2-isocyano-3-butenoates, which are readily converted to the title compounds by acidic hydrolysis.
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Vijay Nair, Anilkumar G. Nair, Nigam P. Rath, Guenter K. Eigendorf
1997 Volume 26 Issue 6 Pages
505-506
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The periselective [4π+2π] cycloaddition reactions of 3-ethoxycarbonyl-2H-cyclohepta[b]furan-2-one with different aralkenes is described. The exclusive formation of [4π+2π] adducts in these reactions has been rationalised by MNDO and AM1 calculations.
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Jun Sumaoka, Ayako Kajimura, Masayuki Ohno, Makoto Komiyama
1997 Volume 26 Issue 6 Pages
507-508
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Homogeneous solutions for DNA hydrolysis are prepared from cerium(IV) ion, lanthanide(III) ion, and dextran. When [Ce(IV)] = 10, [Pr(III)] = 5, and [dextran (monomeric residue)] = 20 mmol dm
−3 at pH 7.0 and 50 °C, the pseudo-first-order rate constant for the hydrolysis of thymidylyl(3′→5′)thymidine (TpT) is 0.10 h
−1.
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Akira Mori, Ken Hirayama, Nobuo Kato, Hitoshi Takeshita, Seiji Ujiie
1997 Volume 26 Issue 6 Pages
509-510
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The X-ray crystallographic structural analysis of 5-butoxy-2-(4-methoxybenzoylamino)tropone, a liquid crystalline compound, revealed to form the head-to-tail dimer, in which a CH-π interaction between the benzoyl π-system and the β-hydrogen of the 5-butoxy group on the tropone ring of the neighboring molecule as well as intermolecular π-π stacking interactions with the two tropone systems. On the other hand, 2-(4-alkoxybenzoylamino)-5-methoxytropone lacking the β-hydrogen and the corresponding benzenoid,
N-(4-alkoxyphenyl)-4-alkoxybenzamide were non-mesogenic.
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Kenkichiro Kobayashi, Shinji Okudaira
1997 Volume 26 Issue 6 Pages
511-512
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ZnO films have been prepared by alternate supply of zinc acetate and H
2O. A rate of film growth is nearly equal to an ideal rate expected for atomic layer epitaxy when both zinc acetate and H
2O are sufficiently supplied. The morphology of ZnO films is affected by amount of zinc acetate and H
2O per cycles.
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Akira Sugimori, Kazutake Suzuki, Sho-hei Nozawa, Akira Soma, Toru Sugi ...
1997 Volume 26 Issue 6 Pages
513-514
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A one-pot reaction among [(Cp)Co(CO)
2], some α,β-unsaturated carbonyls, and elemental sulfur gives cobaltadithiolene complexes, [(Cp)Co(S
2C
2XY)]. The reaction affords a convenient synthesis of the cobaltadithiolene rings having aldehyde and ketone groups. The reaction involves the formal dehydrogenation of alkene presumably
via cooperative interactions with sulfur and [(Cp)Co] species.
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Yong Lu, Changchun Yu, Jinzhen Xue, Yu Liu, Shikong Shen
1997 Volume 26 Issue 6 Pages
515-516
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XPS/AES and pulse reaction characterizations were combined to study the reaction mechanism of CH
4/CO
2 reforming to syngas over Co/γ-Al
2O
3. Surface carbide carbons formed from CH
4 dissociation were active C species for CO generation. Metallic Co species played an important role in dissociating CH
4 to form carbide carbon and H
2, abstracting an O atom from CO
2 molecule, and transferring O atom to carbide to form CO.
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Dai Kubota, Oyo Mitsunobu
1997 Volume 26 Issue 6 Pages
517-518
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The reaction of methyl 2,3-anhydro-α-
D-ribofuranoside or methyl 2,3-anhydro-5,6-
O-cyclohexylidene-α-
D-allofuranoside with 2-propynyl metallic reagents exclusively gave the corresponding 2-
C-(2-propynyl)-
arabino-pentofuranosides and 2-
C-(2-propynyl)-
altro-hexofuranosides, respectively. In contrast, the β-anomers were selectively attacked at the position 3 to afford the corresponding 3-
C-(2-propynyl)furanosides.
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Takashi Ooi, Toshitaka Kiba, Keiji Maruoka
1997 Volume 26 Issue 6 Pages
519-520
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Selective rearrangement of epoxysilanes to α-silylaldehydes has been achieved with high efficiency by using exceptionally bulky oxygenophilic methylaluminum bis(4-bromo-2,6-di-
tert-butylphenoxide) (MABR) as a stoichiometric reagent. Catalytic use of MABR led to silyl enol ethers in good yield.
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Noritaka Mizuno, Hitoshi Nakajima, Hitoshi Tanaka, Tetsuichi Kudo
1997 Volume 26 Issue 6 Pages
521-522
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A reaction of molybdenum nitride with hydrogen peroxide was characterized by elemental analysis,
14N NMR, IR, XPS, TOF mass, and TG/DTA spectroscopy and acid/base, ammonia, and peroxo titration with NaOH, indophenol, and KMnO
4 reagents, respectively. It was found that nitrate and ammonium ions as well as peroxoisopolymolybdates were produced by the reaction.
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Hideyuki Hosono
1997 Volume 26 Issue 6 Pages
523-524
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Platinum-loaded Langmuir-Blodgett and cast films of a porphyrin are prepared, and steady photoinduced hydrogen evolution is observed using both films under steady-state irradiation.
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Masaki Torimura, Kenji Kano, Tokuji Ikeda, Teruhisa Ueda
1997 Volume 26 Issue 6 Pages
525-526
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Direct electron transfer of alcohol dehydrogenase (ADH) from
Gluconobacter suboxydans, which contains one pyrroloquinoline quinone (PQQ) and four hemes
c, are realized on a carbon-wool column electrode. Potential-dependent spectral change monitored with a photodiode array detector is well explained by a five-step Nernstian electron transfer model. The evaluated redox potentials are reasonable to explain the chemical reactivity of ADH with various redox reagents.
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Hiroyuki Aota, Takeshi Reikan, Akira Matsumoto, Mikiharu Kamachi
1997 Volume 26 Issue 6 Pages
527-528
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Water-soluble polymers were prepared from pyrrole and sodium
o-benzaldehydesulfonate by addition-condensation polymerization. The bandgap of the polymer obtained was estimated to be less than 0.5 eV.
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Maria José S. M. Moreno, Rosa Maria L. M. Martins, Maria Lu&iac ...
1997 Volume 26 Issue 6 Pages
529-530
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An efficient method to obtain regioselectively the title compounds is described. Experimental studies concerning the effect of β-substituents on the generation of β-substituted silyl enol ethers made feasible for the first time the isolation and identification of the products resulting from the unstable thermodynamic silyl enol ether.
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Tomohiro Hiraishi, Eiichi Kimura, Toshiaki Kamachi, Ichiro Okura
1997 Volume 26 Issue 6 Pages
531-532
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Photoreduction of cytochrome c
3 using proflavin was investigated and photoinduced hydrogen evolution with hydrogenase using cytochrome c
3 as an electron carrier was established. The photoexcited proflavin was quenched by triethanolamine, followed by cytochrome c
3 reduction, and hydrogen evolution catalyzed by hydrogenase.
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Toshifumi Yoshidome, Toshihito Inoue, Satsuo Kamata
1997 Volume 26 Issue 6 Pages
533-534
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Infrared transmission spectra of
p-nitrobenzoic acid deposited on a Pb film evaporated on a KBr substrate were measured in the Pb film thickness region 0 to 150 nm. The enhancement of the infrared spectrum with the use of the Pb film was first observed. The dependence of the enhancement factor on the Pb film thickness was peculiar, and was discussed together with the structure of the Pb films to clarify the mechanism.
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Masahiko Yamaguchi, Hyeon-Joo Park, Masahiro Hirama
1997 Volume 26 Issue 6 Pages
535-536
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Unstable 3,5,7,9-octatetrayn-2-ol showed potent antimicrobial activity against bacteria and fungi. Its trimethylsilyl derivative, which possessed much improved stability, showed comparable activity. It is due to desilylation under neutral aqueous conditions.
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Kathaperumal Mohanalingam, Hiro-o Hamaguchi
1997 Volume 26 Issue 6 Pages
537-538
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Structure of the two distinct forms of p-nitroaniline (pNA) associated with solvent acetonitrile (AN) has been elucidated by a curve fitting analysis of the observed Raman spectra of pNA in AN/CCl
4 mixed solvents.
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Kazuo Tsujimoto, Kaoru Iida, Mordechai Sheves, Mamoru Ohashi
1997 Volume 26 Issue 6 Pages
539-540
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Hydroretinochromes were reconstituted with aporetinochrome and hydroretinal analogues; 7,8-dihydroretinal, 5,6-dihydroretinal, dehydroretinal, and their analogues. The ‘opsin shifts’ were 2200 ± 100 cm
−1 for trienals and pentaenals, whereas 1600 ± 100 cm
−1 was the value for tetraenals.
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Hideki Sugimoto, Yoichi Sasaki
1997 Volume 26 Issue 6 Pages
541-542
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Tris(2-pyridylmethyl)amine (tpa) coordinates to oxorhenium(V) with two pyridyl and one amino nitrogen atoms leaving one 2-pyridylmethyl arm uncoordinated, giving a series of complexes, [Re(O)(L)(η
3-tpa)]
+ (L is chelating dianion), due to strong trans influence of the oxo ligand.
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Toshio Nishizuka, Sehei Hirosawa, Masaki Tsushima, Shinichi Kondo, Dai ...
1997 Volume 26 Issue 6 Pages
543-544
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An optically active dihydroxy-α-tetralone was synthesized from methyl α-
D-xylopyranoside
via dimethyl (2
R,3
S)-dihydroxyglutarate. This α-tetralone is a key intermediate to construct the natural benanomicinone.
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Toshiaki Murai, Makiko Fujii, Shinzi Kato
1997 Volume 26 Issue 6 Pages
545-546
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The reaction of the lithium eneselenolate generated from selenothioacetic acid
S-butyl ester with oxiranes proceeded regio- and stereoselectively to give β-hydroxyethyl vinyl selenides in good yields. The acid-catalyzed cyclization of β-hydroxyethyl vinyl selenides was complete within 5 min to give 1,3-oxaselenolanes.
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Yutaka Ukaji, Katsumi Taniguchi, Kazunori Sada, Katsuhiko Inomata
1997 Volume 26 Issue 6 Pages
547-548
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The asymmetric 1,3-dipolar cycloaddition of nitrones possessing electron withdrawing group to an achiral allyl alcohol was achieved by the use of diisopropyl (
R,
R)-tartrate as a chiral auxiliary to afford the corresponding isoxazolidines with high regio-, diastereo- and enantioselectivity.
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Toshimasa Katagiri, Makoto Akizuki, Tomoyuki Kuriyama, Satoshi Shinke, ...
1997 Volume 26 Issue 6 Pages
549-550
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Nucleophilic ring-opening reaction of 3,3,3-trifluoropropene oxide (TFPO) was studied. Reaction of TFPO with carbanions stabilized by cyano group gave γ-cyanohydrins in moderate to good yields. Meanwhile, reaction of the carbanions from malonic ester and nitromethane resulted in recovery of TFPO.
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Kouichi Nakagawa, Nobuaki Tsuchihasi
1997 Volume 26 Issue 6 Pages
551-552
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We have detected a free radical in human cerebrospinal fluid (CSF) and have identified as ascorbyl radical using electron paramagnetic resonance (EPR). EPR spectrum of the radical in CSF was compared with one in the corresponding serum. Determination of the ascorbyl radical concentrations in CSF and serum was attempted using known concentrations of a nitroxyl radical. Moreover, an alternative method to measure the biological radical was provided.
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Tatsuya Kawamoto, Naoki Ohkoshi, Isoroku Nagasawa, Hiro Kuma, Yoshihik ...
1997 Volume 26 Issue 6 Pages
553-554
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A novel octanuclear copper(I) complex, which has a compressed square antiprismatic core of copper atoms (Cu···Cu = av. 2.651(9) Å), was prepared by the reaction of copper(II) acetate with 2-(4-methoxyphenyl)benzothiazoline.
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Jun Haginaka, Hisako Takehira, Ken Hosoya, Nobuo Tanaka
1997 Volume 26 Issue 6 Pages
555-556
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A molecularly imprinted uniform-sized polymer-based stationary phase for (S)-naproxen has been prepared using 4-vinylpyridine and ethylenedimethacrylate as a host functional monomer and cross-linker, respectively. The imprinted polymer material could separate naproxen enantiomers with separation factor of 1.74. Further, the materials showed high selectivity for naproxen and moderate selectivity for other 2-arylpropionic acid derivatives. On the other hand, the imprinted polymer material showed little selectivity for other acidic, basic and neutral compounds.
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Takatoshi Seto
1997 Volume 26 Issue 6 Pages
557-558
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A new system for controlling gas separation through the solid-solid interface of a piezoelectric bimorph and using an applied electric field was made. By applying vapor deposition of metal (aluminum) to a surface of the bimorph, we created a field-induced aperture at the interface of nanometer dimensions. The device provided separation of H
2 and CO
2 slightly higher than theoretical Knudsen values. The permeation rates were significantly affected by imposed electric fields.
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Kazuaki Yamanari, Tatsuya Kawamoto, Yoshihiko Kushi, Takashi Komorita, ...
1997 Volume 26 Issue 6 Pages
559-560
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The first ligand oxidation of Co(III)-bound thiolates by molecular dioxygen is realized in the presence of active charcoal. Three oxidation products are characterized by UV/VIS absorption and
13C NMR spectra and X-ray crystal analysis.
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Kazutaka Yanagita, Ikuko Sagami, Toru Shimizu
1997 Volume 26 Issue 6 Pages
561-562
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Yeast harboring rat liver P450 1A2 efficiently degraded trichloroethylene, pentachloroethane and hexachloroethane. Since liver P450s catalyze degradation of thousands of chemicals, this method is promising for chemical-directed degradation of environmental pollutants.
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Tushar K. Chakraborty, Devasamudram Thippeswamy, Vayalakkada R. Suresh ...
1997 Volume 26 Issue 6 Pages
563-564
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Regioselective hydroboration of a 4-methyl-2-alkene, oxidation of the resulting mixture of isomeric alcohols, and finally diastereoselective reduction of the ketone are the key steps in the stereoselective synthesis of C19-C26 fragment of amphidinolide B which was coupled with the C14-C18 fragment leading to the first synthesis of the entire C14-C26 moiety of this important molecule.
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Tushar K. Chakraborty, Vayalakkada R. Suresh
1997 Volume 26 Issue 6 Pages
565-566
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Sharpless asymmetric dihydroxylation and Nozaki-Hiyama-Kishi’s Cr(II)-mediated coupling between an α-alkoxyaldehyde and a vinyl iodide are the key steps in the stereoselective synthesis of the entire C1-C13 segment of the bottom-half of amphidinolide B.
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Matthias Patz, Yoshihiro Kuwahara, Tomoyoshi Suenobu, Shunichi Fukuzum ...
1997 Volume 26 Issue 6 Pages
567-568
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The oxidation of a dimeric
N-benzyldihydronicotinamide with various oxidants such as quinones, triphenyl carbenium ions and a triplet exited tris(bipyridine) ruthenium(II) complex occurs via initial outer-sphere electron transfer followed by fast C–C bond cleavage and second electron transfer. The kinetic studies allow the determination of the oxidation potential of this compound.
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Kazushi Mashima, Hiromu Kaneyoshi, Sei-ichi Kaneko, Kazuhide Tani, Aki ...
1997 Volume 26 Issue 6 Pages
569-570
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The coordinatively unsaturated 16 electron ruthenium-thiolate complexes (
η6-C
6H
6)Ru(S-2,6-C
6H
3Me
2)
2 (
1) and (
η6-C
6Me
6)Ru(S
2C
6H
4) (
2: S
2C
6H
4 = 1,2-benzenedithiolate) react with an excess of hydrazine hydrate to afford a mononuclear
η1-hydrazine complex (
η6-C
6H
6)Ru(
η1-
NH
2NH
2)(S-2,6-C
6H
3Me
2)
2 (
3) and a dinuclear
μ-hydrazine complex [(
η6-C
6Me
6)Ru(S
2C
6H
4)]
2(
μ-
NH
2NH
2) (
4), respectively.
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Hiroyuki Kurata, Hiroshige Baba, Masaji Oda
1997 Volume 26 Issue 6 Pages
571-572
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5,8,17,20-Tetrakis(3,5-di-
t-butylphenyl)-6,7,18,19-tetradehydrotetrathia[24]annulene (4.0.4.0) shows clear paratropicity (antiaromaticity) and highly amphoteric redox properties, whereas the dianion obtained by its alkali metal reduction strong diatropicity (aromaticity) as a novel 26π-electron system.
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Md. Delower Hossain, Masa-aki Haga, Hideaki Monjushiro, Bobak Gholamkh ...
1997 Volume 26 Issue 6 Pages
573-574
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The charge separated(CS) state was efficiently formed as a result of stepwise electron transfer reactions in a novel Ru(II)(bpy)
2-diimide-Os(III)(bpy)
2 triad system (efficiency > 0.7); the rate of electron transfer and the charge separation yield were determined from picosecond time-resolved absorption spectra.
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Narumi Sakagami, Masayuki Tsunekawa, Takumi Konno, Ken-ichi Okamoto
1997 Volume 26 Issue 6 Pages
575-576
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Chromium(III)-lanthanide(III) hetero-polynuclear complex was synthesized and characterized. The structure of [Cr
2Nd
3(μ-OOCCH
3)
6(μ-OH)
6(H
2O)
9]Br
3·NaBr·8H
2O
(1) was determined by X-ray analysis.
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Gyoujin Cho, Il-Shik Moon, Jae-Suk Lee
1997 Volume 26 Issue 6 Pages
577-578
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A new method for immobilizing α-amylase in a hybrid inorganic/organic membrane has been developed for the purpose of potential applications as a membrane bioreactor in aqueous phase. It has been found that chitosan can act as an enzyme-stabilizing host and a dispersant which can homogeneously mix an inorganic (SiO
2) phase and an organic (polymer) phase. The optimum conditions in preparing the membrane were determined. The resulting microscopically homogeneous membranes were characterized by FT-IR, TGA, and water stability. It was found that the enzyme-incorporated membrane showed a very stable activity for the period of our experimental set-up (30 days).
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Masanori Kuroda, Kiyoshi Yokogawa, Takahiro Tsutsumoto, Osamu Yanagisa ...
1997 Volume 26 Issue 6 Pages
579
Published: 1997
Released on J-STAGE: June 01, 2004
JOURNAL
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YBCO/Ag coated SiC composites containing 0.5, 1.0 and 3.0 wt% whisker were prepared by the conventional plasma activated sintering method (PAS) at 973-1,103 K. SiC whisker was covered with Ag thin film by electroless coating method to suppress interfacial reaction between superconductor and SiC whisker. It was shown that superconducting transition occured at 90 K in the specimen with 3 wt% of Ag coated SiC whisker.
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