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Takashi Sugioka, Shi-Wei Zhang, Noritsugu Morii, Takashi Joh, Shigetos ...
1996 Volume 25 Issue 4 Pages
249-250
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Rhodium complexes catalyze carbonylation of 2-alkynylbenzaldehyde
1 under water-gas shift reaction conditions to give novel lactone
2 as a major product (up to 59% yield), the structure of which is a tricyclic ring system.
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Fumio Mizutani, Yukazi Sato, Soichi Yabuki, Yoshiki Hirata
1996 Volume 25 Issue 4 Pages
251-252
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An ultra-thin layer containing immobilized glucose oxidase was produced through the co-adsorption of the enzyme and poly-
L-lysine onto a mercaptopropionic acid-modified gold electrode. The enzyme molecules were considered to be entrapped in a cross-linked matrix consisting of the carboxylic acid on the electrode and the cationic polymer.
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Shinji Takeoka, Tomitarô Hara, Kimihisa Yamamoto, Eishun Tsuchid ...
1996 Volume 25 Issue 4 Pages
253-254
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Thermal stability of electric conductivity of polypyrrole (PPy) was improved using aromatic sulfonate derivatives as dopants having mobile hydrogen in the form of acid groups such as sulfonic acid, carboxylic acid, or hydroxide groups. Particularly, when
m-sulfobenzoic acid or 5-sulfosalicylic acid were used as dopants, the PPy showed high thermal stability of electric conductivity and kept 95% electric conductivity even after heating for 8 h at 150 °C in air.
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Jun-ichi Tanaka, Tatsuo Higa, Gérald Bernardinelli, Charles W. ...
1996 Volume 25 Issue 4 Pages
255-256
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Two new cytotoxic macrolides, latrunculin S and neolaulimalide, have been isolated from the sponge
Fasciospongia rimosa, and their structures determined by NMR and chemical correlation with known congeners.
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Izumi Ichinose, Kunitaka Fujiyoshi, Suguru Mizuki, Yuri Lvov, Toyoki K ...
1996 Volume 25 Issue 4 Pages
257-258
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Multilayer films of cationic bilayer membranes were prepared by means of alternate electrostatic adsorption with sodium poly(styrenesulfonate). Linear film growth was observed for at least 30 layers, as monitored by UV spectroscopy and quartz crystal microbalance (QCM). A regular multilayer film of cationic bilayer membrane with anionic bilayer membrane was similarly prepared.
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Kiyotaka Onitsuka, Toshiya Yoshida, Fumiyuki Ozawa, Kenkichi Sonogashi ...
1996 Volume 25 Issue 4 Pages
259-260
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The treatment of 1,1′-ferrocenediyldiplatinum complex {C
5H
4Pt(cod)NCS}
2Fe (
1) with 2 equivalents of PAr
3 results in the formation of a novel dimeric μ
3(2S,N)-NCS complex (
2), of which structure has been determined by an X-ray diffraction analysis. Reaction of
1 with MeSSMe in the presence of triphenylphosphine gave a μ-thiolato complex (
3).
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Andrey Tsyganok, Kiyoshi Otsuka, Ichiro Yamanaka, Vasilii Plekhanov, S ...
1996 Volume 25 Issue 4 Pages
261-262
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2,4-Dichlorophenoxyacetic acid (commercial pesticide 2,4-D) can be dechlorinated by electrochemical reduction at different carbon materials under mild conditions to give phenoxyacetic acid with 80% selectivity at 75% conversion of 2,4-D (current efficiency 10∼14%).
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Yoshiharu Yoneyama, Shigehiro Ando, Keishi Hamajima, Takaaki Hagino, T ...
1996 Volume 25 Issue 4 Pages
263-264
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Effect of introduction of butyl group into Yubari coal on hydropyrolysis was investigated. The strong promoting effect of butyl group on gasification of coal was observed at considerably low temperature, 500 °C: The yield of gas increased from 29 wt% of Yubari coal to 82 wt% of butylated Yubari coal.
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Masaichi Saito, Norihiro Tokitoh, Renji Okazaki
1996 Volume 25 Issue 4 Pages
265-266
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Exhaustive desulfurization of overcrowded diaryl-substituted 1,2,3,4,5-tetrathiastannolanes having a 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) group on the tin atom resulted in the formation of the corresponding kinetically stabilized diarylstannylenes, the formation of which was confirmed by the characteristic electronic absorptions attributable to the n-p transitions of stannylene, and by the chemical trapping by 2,3-dimethyl-1,3-butadiene.
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Chieko Uchida, Kaori Wakamatsu, Masanao Oya
1996 Volume 25 Issue 4 Pages
267-268
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The conformational transition of poly(Ser:22-co-Lys:78) was studied in a mixed solution of 1,1,1,3,3,3,-hexafluoroisopropanol (HFIP) and water by circular dichroism (CD) spectroscopy. The structure of this polymer was α-helix in 100% HFIP solution and random coil in 100% water. The conformational transition was observed in 50 / 50 (HFIP : water).
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Juzo Nakayama, Tomoki Matsui, Yoshiaki Sugihara, Akihiko Ishii, Shigek ...
1996 Volume 25 Issue 4 Pages
269-270
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Oxidation of four tetraarylselenophenes, 2,5-dimethyl-3,4-diphenylselenophene, 2,4-di-
t-butylselenophene, and benzo[
b]selenophene with dimethyldioxirane produces the corresponding selenophene 1,1-dioxides in high yields.
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Hiromi Uchiro, Teruaki Mukaiyama
1996 Volume 25 Issue 4 Pages
271-272
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Lithium bis[(trifluoromethyl)sulfonyl]imide was found to be a new and effective additive in the stereocontrolled synthesis of α-
D-ribofuranosides from 2,3,5-tri-
O-benzyl-
D-ribofuranose and several alcohols while β-anomers were formed in the absence of the lithium salt. A hypothetical mechanism of this reverse stereocontrol to yield α-
D-ribofuranosides by the influence of the lithium salt is discussed.
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Xixian Huang, Hidehiko Arai, Shinpei Matsuhasi, Teijiro Miyata
1996 Volume 25 Issue 4 Pages
273-274
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The yield of phenol, identified as the main product, was enhanced remarkably by addition of cyclodextrins (CDs) and glucose. The effect was found to increase with cavity dimensions. It was suggested that inclusion accelerates hydrogen atom abstraction by the incorporated intermediate radicals.
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Masaki Suzuki, Miki Niwa
1996 Volume 25 Issue 4 Pages
275-276
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In order to enhance the tolerance of Pd loaded on zeolite catalyst to the humidity, chemical vapor deposition of silicon alkoxide has been studied in the reduction of NO by methane in the presence of oxygen. The suppression of activity by the added water vapor was able to be reduced or almost disregarded by the deposition of silica.
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Toshiharu Teranishi, Ken Nakata, Mikio Miyake, Naoki Toshima
1996 Volume 25 Issue 4 Pages
277-278
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Neodymium ions, which are placed close to ultrafine palladium particles by immobilization on water-soluble polymers, did promote the catalytic activity of the palladium particles for hydrogenation of acrylic acid. The acrylic acid is considered to be concentrated around ultrafine palladium particles by coordinating to neodymium ions bound to the protecting polymer.
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Masafumi Nakamura, Masaharu Tsuji, Makoto Tanaka, Yukio Nishimura
1996 Volume 25 Issue 4 Pages
279-280
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The He(
np
3P → 2s
3S) emission lines from
n = 5–12 have been observed in a He flowing afterglow. A comparison of the He-pressure dependence of the emission intensity with those predicted from the two-body [He
+][e
−] and three-body [He
+][e
−][He] and [He
+][e
−][e
−] recombination processes indicated that the high Rydberg He(
np
3P:
n = 5–12) states are produced from the last three-body collisional-radiative (CR) recombination reaction.
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Yoshinori Suga, Tomohiko Takahama
1996 Volume 25 Issue 4 Pages
281-282
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Molecular dynamics simulations are performed for six types of solvents to predict the solubility parameters. Investigation of the deciding factor in determining these values is also reported.
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Hitoshi Muguruma, Isao Karube, Masao Saito
1996 Volume 25 Issue 4 Pages
283-284
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We propose a novel method of introducing thiol groups onto polymer surfaces of
e.g. polyethylene by plasma treatment with sulfur-containing organic compounds. X-ray photoelectron spectroscopic analyses of the plasma treated surfaces are presented.
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Mamoru Fujitsuka, Tadatake Sato, Akira Watanabe, Osamu Ito, Takeo Shim ...
1996 Volume 25 Issue 4 Pages
285-286
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Photochemical polymerizations of dithienothiophenes were investigated. Photo-irradiation to the solution containing dithienothiophene and appropriate electron acceptor gave poly-dithienothiophene having
ca. 10
4 (vs. PSt.) of molecular weight. The cation radical of the monomer was efficiently generated through photoinduced electron transfer from the excited state of the monomer to the electron acceptor. Then the successive coupling reaction resulted in a formation of the polymers.
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Hitoshi Kanno, Yoshifumi Akama
1996 Volume 25 Issue 4 Pages
287-288
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Rare earth phosphate glasses of the composition Ln(PO
3)
3·KPO
3 (Ln : rare earth ion) were prepared and their glass transition temperatures (
Tg′s) were measured. From the
Tg variation across the series, it is shown that the coordination number of rare earth ions changes, probably from nine to eight, in the middle of the series.
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Sadao Miki, Yasuyuki Ikeyama, Koushi Fukunishi
1996 Volume 25 Issue 4 Pages
289-290
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3-Methoxycarbonyl-9-methyl-6-
trans-phenylazo- and 3-cyano-9-methyl-6-
trans-phenylazothioxanthene-10,10-dioxide were synthesized. They reveal a property as a carbon acid based on the proton dissociation at C(9)-H, and the dissociation constants are much larger in their
trans-azo form than the
cis form. Their conjugate bases possess absorption band at around 670 nm. Developing and bleaching of the color are linked with the
trans-
cis photoisomerization of the phenylazo group.
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Kiyomi Imagawa, Eiichiro Hata, Tohru Yamada, Teruaki Mukaiyama
1996 Volume 25 Issue 4 Pages
291-292
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Convenient method for preparation of 1,2-diamine from the corresponding nitroolefin was established by successive reactions of Michael addition of
O-ethylhydroxylamine to nitroolefin and reduction with hydrogen. The present preparative method was applicable to various nitroolefins by one-pot procedure.
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Takeshi Fukuda, Tomoya Terauchi
1996 Volume 25 Issue 4 Pages
293-294
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It is shown that in order for the “living” radical polymerization mediated by stable nitroxyl radical (SNR) to proceed successfully, a constant supply of initiating radicals (by, e.g., thermal initiation) to make up for the loss of polymer radicals due to irreversible bimolecular termination is essential in addition to the frequent reversible combination of polymer radical with SNR. The stationary rate of SNR-mediated polymerization is totally independent of the SNR concentration, being equal to the polymerization rate of the SNR-free system. Experimental evidence is presented showing that in the “living” polymerization of styrene, both of these requirements are met in fact.
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Koji Araki, Takeshi Kajikawa, Satoshi Kawaguchi
1996 Volume 25 Issue 4 Pages
295-296
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Lanthanide cations showed high catalytic activities in aminoacylation of alcohols by the amide-substrates having bipyridine as a metal chelation site at 30 °C (first-order rate constants were 10
−4 s
−1 range at Ce
3+/substrate = 0.2), yielding corresponding amino acid esters almost quantitatively.
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Toshio Shimizu, Tomonari Urakubo, Nobumasa Kamigata
1996 Volume 25 Issue 4 Pages
297-298
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Enantiomerically pure ethylmethylphenyltelluronium salts were isolated by optical resolution from a diastereomeric mixture of ethylmethylphenyltelluronium (
1S)-(+)-camphor-10-sulfonate and subsequent anion exchange reactions, and the absolute configurations were determined based on the X-ray crystallographic analysis of a diastereomeric isomer.
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Kohei Imura, Ryotarou Midorikawa, Toshio Kasai, Hiroshi Ohoyama, Dock- ...
1996 Volume 25 Issue 4 Pages
299-300
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The formation ratio of the two spin-orbit states,
3P
0 /
3P
2, of the metastable argon, Ar
*, was investigated by the glow discharge of a pulsed Ar supersonic beam. The
3P
0 /
3P
2 ratio decreased with the increase of the glow discharge potential V
g, by which the electron bombardment initiates the discharge. The observed V
g-dependence clearly showed an inverse behavior against V
g as compared with that in the conventional electron impact by low beam densities.
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Hitoshi Matsumoto, Aiichiro Ori, Fumiaki Inokuchi, Seiji Shinkai
1996 Volume 25 Issue 4 Pages
301-302
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A calix[4]arene bearing three amide groups (composing a lanthanide binding site) and one sensitizer (phenacyl group) bearing an (
o-boronylphenyl)methylaminomethyl group (acting as a sugar-binding site) was synthesized. The energy-transfer to Eu
3+ was significantly enhanced whereas that to Tb
3+ was only slightly enhanced, indicating that in the Eu
3+ complex the energy is mainly transferred from the sensitizer whereas in the Tb
3+ complex it is mainly transferred from the calix[4]arene aromatic rings. This is a novel method for discriminating the energy-transfer path.
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Juan Wang, Asao Nakamura, Keita Hamasaki, Hiroshi Ikeda, Tsukasa Ikeda ...
1996 Volume 25 Issue 4 Pages
303-304
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Modified cyclodextrin (
1), which has p-N,N-dimethylaminobenzoyl and biotin units as a fluorophore and a protein-binding site, respectively, exhibits promoted sensing ability for various organic compounds in aqueous solution in the presence of avidin.
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Tomoyuki Itaya, Yutaka Sasaki, Teiichi Tanigaki, Akira Matsumoto, Kenz ...
1996 Volume 25 Issue 4 Pages
305-306
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Hexakis(4-carboxylatophenoxy)cyclotriphosphazene,
1, forms a stable 1:2
1 - lanthanide ion (Eu
3+ and Tb
3+) complex. The fluorescence behavior and structure of the complexes have been discussed.
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Kouichi Asakura, Tomoya Watanabe, Eitoshi Honda, Shuichi Osanai
1996 Volume 25 Issue 4 Pages
307-308
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The oxidative coupling of
p-cresol in the aqueous solution was carried out in the presence of cyclodextrins. The production of the dimeric compound was preferentially prevented by α-cyclodextrin, while the trimerization was efficiently inhibited by γ-cyclodextrin. The different effects of these two cyclodextrins were explained by their different inclusion complex forming ability which depended on their cavity size.
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Shigenori Kashimura, Manabu Ishifune, Yoshihiro Murai, Tatsuya Shono
1996 Volume 25 Issue 4 Pages
309-310
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Cathodic coupling of ketones with ethoxydimethylvinylsilanes takes place regioselectively at the position β to ethoxydimethylsilyl group and affords 1-oxa-2-silacyclopentane derivatives as products which are easily transformed to 1,3-diols by oxidative desilylation.
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Kyungsoo Paek, Hyejae Ihm
1996 Volume 25 Issue 4 Pages
311-312
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Conformationally stable, tunable upper-rim calix[4]crowns
3 ∼
7 were synthesized in good yields from dibromodihydroxycalix[4]arene hexyl ether
1 and the picrate extraction experiment showed their higher affinities for primary ammonium ions compared to those for alkali metal cations.
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Hiroshi Hama, Akira Miyashita, Kiyomi Yamaoka, Hiroo Nakahara
1996 Volume 25 Issue 4 Pages
313-314
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For long-chain derivatives of spirobenzoselenazopyran the photochromic reactions in monolayers on water surface have been investigated and effects of the molecular packing upon the reaction were clarified in comparison with the reactivities at different surface pressures as well as those in the solution.
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Jiro Nakatani, Yuji Ozeki, Kousuke Sakamoto, Kazuyoshi Iwayama
1996 Volume 25 Issue 4 Pages
315-316
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Decomposition of NO in the presence of oxygen was promoted by using an electrochemical cell composed of YSZ and non-porous Pd electrodes. The NO conversion into N
2 was successfully improved by coating the Pd electrodes with a perovskite oxide (La
1−xSr
xCoO
3).
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Jun Saito, Takeo Kaneko, Peiming Yang, Yoshio Niwa, Masahiko Tsuchiya
1996 Volume 25 Issue 4 Pages
317-318
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Reactions between poly(oxymethylene)glycol (POMG) in aqueous solution and methanol or ethanol were studied by liquid ionization mass spectrometry. Hemiformalization of POMG occurred soon after methanol addition to form monomethylethers of POMG and completed within 15 min. While hemiformalization by ethanol addition occurred slowly and it took time, about 30 min, before producing monoethylethers of POMG.
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Makoto Negishi, Osamu Tsutsumi, Tomiki Ikeda, Tamejiro Hiyama, Joji Ka ...
1996 Volume 25 Issue 4 Pages
319-320
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Fast optical switching (response time 90 μs) was achieved of ferroelectric liquid crystals doped with a photoresponsive chiral dopant having an azobenzene moiety.
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Masaki Nishiuchi, Keisuke Honda, Takeshi Nakai
1996 Volume 25 Issue 4 Pages
321-322
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The Lewis acid-promoted versions of the cycloaddition reaction between methyl 2-(benzoylamino)methylene-3-oxobutanoate and methylketene diethyl acetal are shown to provide a 1β-methylcarbapenem intermediate with high diastereoselectivity and moderate enantioselectivity.
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Yasutake Teraoka, Hiroshi Nii, Shuichi Kagawa, Kjell Jansson, Mats Nyg ...
1996 Volume 25 Issue 4 Pages
323-324
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The catalytic activity of perovskite-type La
0.8Sr
0.2M
1−2yCu
yRu
yO
3 (M = Al, Mn, Fe, Co) for CO Oxidation and NO–CO reactions was changed significantly by the simultaneous substitution of Cu and Ru for M at the B sites, and its effect was dependent on host M cations. The simultaneous Cu/Ru substitution into the inert host of La
0.8Sr
0.2AlO
3 gave a very active catalyst at a substitution level (y-value) of 0.1.
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Tsuguyori Ohana, Akira Yabe
1996 Volume 25 Issue 4 Pages
325-326
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The photolysis of bis(diazo)cyclohexanetetraone (
1) was investigated in an argon matrix at 17 K. Two intermediates were formed by a consecutive decomposition of two diazo groups of
1, which were identified by UV-vis and IR spectroscopies.
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Shuji Tanabe, Hiroshige Matsumoto, Takanori Mizushima, Kenji Okitsu, Y ...
1996 Volume 25 Issue 4 Pages
327-328
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New technique to prepare finely dispersed metallic species in a zeolitic framework has been developed by a high frequency-ultrasonic (HFUS) irradiation. The parent Pd ions in the zeolite were reduced with isopropyl alcohol into carbon containing Pd metal during the irradiation. These species was observed by EXAFS analysis to be highly dispersed into small clusters consisted of less than several atoms in zeolitic crystal.
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