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M. Janaki Ram Reddy, G. Venugopal Rao, K. Mani Bushan, Maruthi Janaki ...
2001 Volume 30 Issue 3 Pages
186-187
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Anthryldiene derivatives carrying electron withdrawing end group displayed wavelength dependant regio selective
E(
trans) →
Z(
cis) isomerization from the singlet excited state. Fluorescence studies indicated the highly polarized/charge-transfer nature of the singlet excited state.
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Xueguang Wang, Wenhua Hou, Qijie Yan
2001 Volume 30 Issue 3 Pages
188-189
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Silica-pillared layered titanoniobate supported Cu catalysts have been prepared and showed high and relatively stable activity for the direct decomposition of NO (0.1 vol% in helium) in the space velocity range of 3000–30000 cm
3 g
−1 h
−1.
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Hidehiko Fujisawa, Yasuhiro Sasaki, Teruaki Mukaiyama
2001 Volume 30 Issue 3 Pages
190-191
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High yield and excellent diastereoselectivity in the formation of methyl (2
R, 3
R, 5
R, 6
S)-2,6-dibenzyloxy-7-(
t-butyldimethylsiloxy)-3-hydroxy-5-(4-methoxybenzyloxy)-4,4-dimethylheptanoate
3 and methyl (2
R, 3
R, 4
S)-2,4-dibenzyloxy-3-hydroxypentanoate
7 are achieved by aldol reaction between (
Z)-2-benzyloxy-1-methoxy-1-(trimethylsiloxy)ethene
1 and chiral alkoxy aldehydes using three equivalents of MgBr
2·Oet
2. The following mechanism of the above aldol reaction proposes that MgBr
2·Oet
2 activated both chiral alkoxy aldehydes and silyl enolate, that is, magnesiumu enolate, formed by transmetalation from silyl enolate and MgBr
2·Oet
2, reacted with MgBr
2·Oet
2-chelated alkoxy aldehydes via the six-membered cyclic transition state.
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Demetris P. Papahatjis, Spyros Nikas, Andrew Tsotinis, Margarita Vlach ...
2001 Volume 30 Issue 3 Pages
192-193
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A new, general, one pot method for introducing carbocyclic rings alpha to a nitrile moiety is described. Treatment of readily available arylacetonitriles with potassium bis(trimethylsilyl)amide and subsequent alkylation with
α, ω-dibromo or dichloroalkanes in tetrahydrofuran under anhydrous conditions at 0 °C produces cycloalkyl adducts in good yields and short reaction times.
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Qinghong Zhang, Ye Wang, Yoshihiko Ohishi, Tetsuya Shishido, Katsuomi ...
2001 Volume 30 Issue 3 Pages
194-195
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The V-MCM-41 with lower V content catalyzes the oxidation of propane to acrolein with a yield of 3.3% and selectivity of 20%, while that with higher V content mainly produces propene.
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Takayuki Sasaki, Akira Kudo
2001 Volume 30 Issue 3 Pages
196-197
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The sorption of Pu to the anaerobic bacteria activated under specific conditions of temperature, pH and depleted nutrients after long dormant period was investigated. After 4 h at neutral pH, the distribution coefficient (
Kd) between bacteria and aqueous phase at 308 and 278 K had around 10
3 to 10
4. After over 5 days, however, the
Kd at only 308 K had increased to over 10
5. Sterilized (dead) and dormant anaerobic bacteria adsorbed Pu to the same extent.
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Shaheda A. Wahab, Hiroatsu Matsuura
2001 Volume 30 Issue 3 Pages
198-199
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The Raman spectra of aqueous solutions of CH
3(OCH
2CH
2)
3OCH
3 were measured for mole fractions 0.002–0.06 at five temperatures between 5 and 45 °C. The population of the
gauche conformation around the C–C bond shows its maximum at about 0.01 mole fraction. The appearance of the maximum is less prominent at higher temperatures. The observed conformational behavior is consistent with the results of molecular dynamics simulations.
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Ryoka Matsushima, Nobuki Tanaka, Okihiro Sugihara, Naomichi Okamoto
2001 Volume 30 Issue 3 Pages
200-201
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By repeating the corona poling process for several times, dye-doped polymer films were efficiently poled at temperatures significantly lower than
Tg. High second-order NLO efficiency (e.g.,
d33 around 100 pm/V) was obtained with a guest dye, 2-(
p-diethylaminocinnamilidene)-indan-1, 3-dione.
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Akira Shimoyama, Hideyuki Katsumata
2001 Volume 30 Issue 3 Pages
202-203
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The Murchison carbonaceous chondrite was analyzed for polynuclear aromatic thiophenes in organic solvent extract. Benzothiophene, dibenzothiophene and their methyl derivatives, and benzonaphtothiophenes were detected in concentration at levels of ten and hundred-pmol g
−1. The abundance pattern of these thiophenes in the chondrite was markedly different from those in the two kinds of terrestrial sediments, indicating abiotic origin of these thiophenes.
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Takahira Tokimoto, Satoshi Tsukahara, Hitoshi Watarai
2001 Volume 30 Issue 3 Pages
204-205
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To measure fast reaction processes of the ms order at the interfacial region in the solvent extraction system, we invented a new method using a micrometer-sized two-phase sheath flow system and a laser-induced fluorometry. The reaction between Zn
2+ with 5-octyloxymethyl-8-quinolinol (Hocqn) in the 1-butanol/water system was examined. The fluorescence intensity of Zn
2+-ocqn complex, which increased along the inner organic phase flow, gave the complexation rate of Zn
2+ with Hocqn.
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Yuhua Wang, Kyota Uheda, Hirotsugu Takizawa, Tadashi Endo
2001 Volume 30 Issue 3 Pages
206-207
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GdBO
3:Eu vaterite type particles with fine size, plate morphology, and non-aggregation were first prepared by the mild hydrothermal method. Their characteristics were investigated and compared with those of particles prepared by solid state reactions. The result showed that the hydrothermal method appears to be applicable to prepare high quality phosphors for practical uses. This conclusion was reinforced by the existence of an important improvement in the photoluminescent performances.
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Hiroki Akutsu, Jun-ichi Yamada, Shin’ichi Nakatsuji
2001 Volume 30 Issue 3 Pages
208-209
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The title organic anion was prepared as its tetraphenylphosphonium salt, (Ph
4P)(TEMPO-NHSO
3), which reacted with (TTF)
3(BF
4)
2 to give (TTF)(TEMPO-NHSO
3), which shows the Curie–Weiss behavior (
C = 0.360 emu K mol
−1 and
θ = −0.52 K) with weak antiferromagnetic interaction. This magnetic behavior is found to be attributed to the TEMPO radical.
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Takuya Matsumoto, Inder Pal Singh, Hideo Etoh, Hitoshi Tanaka
2001 Volume 30 Issue 3 Pages
210-211
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The first total synthesis of grandinal (
1) is accomplished by biomimetic cycloaddition of the jensenone derivative (
2) and the
o-quinone methide (
3) generated by oxidation of grandinol (
4).
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Makoto Okamoto, Teizo Yamaji
2001 Volume 30 Issue 3 Pages
212-213
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A high selectivity of biphenyl (88%) was attained by the Pd-catalyzed dimerization of benzene in the presence of O
2 and acetic acid when MoO
2(acac)
2 was used as a cocatalyst. Various Mo compounds gave high selectivities of biphenyl (82–87%).
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Baolong Li, Huibiao Liu, Yan Xu, Gui Yin, Jiutong Chen, Zheng Xu
2001 Volume 30 Issue 3 Pages
214-215
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A novel mixed-valence Co
IICo
III complex [Co
II2Co
III(nta)
2(azpy)
4(H
2O)
6]·[Co
IICo
III(nta)
2(azpy)
2(H
2O)
2]·4H
2O
was synthesized and characterized. Its structure is composed of new motifs, called “the rod with open sidearms” anion and H-like trinuclear cation, which interlock each other. The stack of one-dimensional chains of [Co
IICo
III(nta)
2(azpy)
2(H
2O)
2] forms two-dimensional rhombus pores through π–π stacking interaction of pyridyl rings from azpy.
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Xiang Wang, You-chang Xie
2001 Volume 30 Issue 3 Pages
216-217
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SnO
2-based composite oxides containing Fe and Cr were prepared using the combination of redox reaction and co-precipitation, and studied for CH
4 deep oxidation. It was found that Fe and Cr were incorporated into SnO
2 (Cassiterite) to form some catalysts that are more active and far more resistant to thermal sintering than pure SnO
2. Solid solution structure is possibly formed in these catalysts.
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Sakae Takenaka, Kiyoshi Otsuka
2001 Volume 30 Issue 3 Pages
218-219
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Carbon filaments formed by the decomposition of methane over Ni/SiO
2 catalyst are converted efficiently with conversions > 91% into CO by gasification with CO
2.
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Satoshi Yamabi, Hiroaki Imai
2001 Volume 30 Issue 3 Pages
220-221
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Rutile TiO
2 foils with high specific surface area were fabricated through heterogeneous nucleation on substrates in acidic aqueous solutions of titanyl sulfate. Rutile crystals were directly deposited even at a near room temperature in the solutions at the conditions around the boundary between the Ti(IV) soluble species and the TiO
2 crystal in the phase stability diagram of the Ti(IV)-H
2O system.
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Norihiko Yoneda, Tsuyoshi Fukuhara
2001 Volume 30 Issue 3 Pages
222-223
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IF
5 in Et
3N–3HF was found to be a stable, non-hazardous, easy to handle, and inexpensive reagent that enables effective and selective fluorination of organic compounds under mild conditions.
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Manabu Yanagisawa, Teruaki Mukaiyama
2001 Volume 30 Issue 3 Pages
224-225
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Catalytic and stereoselective glycosylation with glycosyl fluoride using carbocationic species paired with tetrakis(pentafluorophenyl)borate [B(C
6F
5)
4−] or trifluoromethanesulfonate (TfO
−) is investigated. When the glycosylation is carried out using the former catalyst in dichloromethane containing
tBuCN, the major product is β-glycoside while α-selectivity is observed when the latter catalyst in dichloromethane containing Et
2O is used. In addition to the characteristic properties of the solvent, the nature of the counter anion such as B(C
6F
5)
4− or TfO
− plays important roles in controlling the selectivity. Thus, an appropriate combination of catalyst and solvent leads to the formation of disaccharides.
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Masakazu Iwamoto, Yasuhiro Tanaka, Jiro Hirosumi, Nozomu Kita
2001 Volume 30 Issue 3 Pages
226-227
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On Ti-containing MCM-41 prepared by a template ion- exchange method, sulfide could be asymmetrically oxidized to sulfoxides in the presence of optically active tartaric acid (54% yield and 30% ee). The oxidation was composed of the asymmetric induction to sulfoxides and the subsequent kinetic resolution of sulfoxides.
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Katsuaki Kuge, Hiromi Tobita, Hiroshi Ogino
2001 Volume 30 Issue 3 Pages
228-229
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Reaction of trisulfido-bridged diiron complex [CpFe(CO)
2]
2(µ-S
3) with 0.8 equiv of W(CO)
5THF produced a trinuclear cluster [CpFe(CO)
2]
2(µ
3-S
3)W(CO)
5 in which the W(CO)
5 moiety was selectively coordinated to one of the α-sulfur atoms of the trisulfido ligand. The reaction with an excess of W(CO)
5THF afforded a tetranuclear cluster [CpFe(CO)
2]
2(µ
4-S
3)[W(CO)
5]
2 as a major product in which the W(CO)
5 moieties were coordinated to both of the α-sulfur atoms of the trisulfido ligand.
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Shu-ichi Fukuyoshi, Takenori Kusumi
2001 Volume 30 Issue 3 Pages
230-231
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Reduction reactions of phenethyl iodide and
m-methoxybenzyl bromide with tributyltin hydride are accelerated by a strong (9.4 T) magnetic field.
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One-Sun Lee, Yun Hee Jang, Young Gi Cho, Myung Ho Hyun, Hie-Joon Kim, ...
2001 Volume 30 Issue 3 Pages
232-233
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The role of electrostatic interactions in enantioselective separation was demonstrated. Enantioselective separation of
N-(3,5-dinitrobenzoyl)leucine and its esterified analogue was investigated by (
S)-phenylglycine-based HPLC under an intermediate pH, and examined with a relaxed scan calculation combined with a Monte Carlo conformation search.
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Emi Yamamoto, Kanji Kubo, Akira Mori
2001 Volume 30 Issue 3 Pages
234-235
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N, N′-Bis(tropon-2-yl)diazacrown ethers (
2) were found to display unique absorption spectral changes in the presence of guest cations. X-ray crystallographic analysis indicated that
2a·zinc and
2c·calcium thiocyanate complexes consist of an ion pair with zinc tetrathiocyanate anion and
2a·zinc cation, and with calcium hexathiocyanate anion and
2c·H
2O·calcium cation, respectively. Complexation gave rise to deconjugation between the tropone ring and the lone pair electrons of the nitrogen atom to cause spectral changes.
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Yong Cui, Jin Ren, Gang Chen, Yitai Qian, Yi Xie
2001 Volume 30 Issue 3 Pages
236-237
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CuInS
2 and AgInS
2 semiconductor nanorods are prepared readily from a stoichiometric mixture of In(S
2CNEt
2)
3 and Cu(S
2CNEt
2)
2 or Ag(S
2CNEt
2), by remove of the thione groups with ethylenediamine at 195 °C in a solvothermal process.
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Yuko Morita-Murase, Isao Murakami, Yoshio Homma
2001 Volume 30 Issue 3 Pages
238-239
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A liquid scintillation spectrometer has been applied to the determination of the counting efficiency for the air luminescence produced by standardized
222Rn and its daughters. Based on the counting efficiency, known amounts of
222Rn can be prepared in 3.5 h. Moreover, the
226Ra source from which
222Rn is collected does not necessary have to be a standard one. In contrast, the conventional method for preparing known amounts of
222Rn usually requires a long waiting period (ca. 15–30 days).
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Yorimitsu Kodama, Akihito Fujiwara, Hideki Kawamoto, Nobuaki Ohta, Aki ...
2001 Volume 30 Issue 3 Pages
240-241
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The cathodic reduction of acetophenone in the presence of a chiral cationic surfactant in aqueous media gave
S- or
R-1-phenylethanol with 8–12 % ee. The observed enantioselectivity clearly suggests the interaction between the cationic surfactants and the anionic intermediate generated from the one-electron reduction of acetophenone.
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Deqing Zhang, Liang Ding, Wei Xu, Xiangling Jin, Daoben Zhu
2001 Volume 30 Issue 3 Pages
242-243
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Two new cuprous iodide coordination compounds [Cu
2I
2(
p-PYNN)
4] (
1) and [Cu
4I
4(
m-PYNN)
4] (
2) containing four nitronyl nitroxides were synthesized, and their crystal structures as well as magnetic properties were investigated.
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Yukihito Matsuura, Kimihiro Matsukawa, Hiroshi Inoue
2001 Volume 30 Issue 3 Pages
244-245
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Polysilane–silica hybrid thin films, in which the polysilane segment is encapsulated within the silica matrix, were prepared by a sol–gel method using copolymers, poly[methylphenylsilane-
co-(methacryloxypropyltrimethoxysilane)]. The hybrid thin films were composed of a wide range of polysilane and silica ratios without phase separation. The observed refractive index of the hybrid thin film was changed from 1.61 to 1.49 with a different composition ratio. Their refractive indexes were decreased with degradation of polysilane segments on UV irradiation.
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M. Arjun Reddy, L. Rajender Reddy, N. Bhanumathi, K. Rama Rao
2001 Volume 30 Issue 3 Pages
246-247
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β-Cyclodextrin catalyzed for the first time a facile ring opening of aziridines with nucleophiles such as aromatic amines and azides in water at room temperature to afford diamines and azidoamines respectively in good yields.
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Naoki Yamada, Kozo Toyota, Masaaki Yoshifuji
2001 Volume 30 Issue 3 Pages
248-249
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Two new sterically protected 3,4-diphosphinidenecyclobutenes, i.e., 1,2-bis[4-(4-methylphenyl)butyl]-3,4-bis[(2,4,6-tri-
t-butylphenyl)phosphinidene]cyclobutene, and 3,4-bis[(2,4,6-tri-
t-butylphenyl)phosphinidene]-1,2-bis[4-(4-vinylphenyl)butyl]cyclobutene, were prepared. Copolymerization of the latter with styrene was studied. Treatment of [6-(4-vinylphenyl)hex-1-ynyl](2,4,6-tri-
t-butylphenyl)phosphine with butyllithium and 1,2-dibromoethane afforded a polymer of the latter cyclobutene.
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Satoshi Tsukahara, Katsuyuki Yamanaka, Hitoshi Watarai
2001 Volume 30 Issue 3 Pages
250-251
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Dielectrophoresis (DEP) of single DNA (about 40 kbp) labeled with a fluorophore was successfully observed in a planar quadrupole electrode cell whose working area was 65 µm in radius. The DEP behavior depended on frequency (
f) of alternating current; positive DEP at lower
f and negative DEP at higher
f. The combination of the DEP force and a laminar flow in a capillary (82.5 µm in inner radius) with a quadrupole electrode controlled the elution of DNA from the capillary as a function of
f.
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Yasuharu Yoshimi, Kazuhiko Mizuno, Hajime Maeda, Nobuyuki Ichinose, To ...
2001 Volume 30 Issue 3 Pages
252-253
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The photo-Claisen type rearrangement of 2-(1-methoxycarbonylnaphthyl)methyl phenyl ether derivatives
1a–f was investigated. The 2-(1-methoxycarbonylnaphthyl)methyl radical and its fluorescence by use of two colored laser flash photolysis (LFP) technique were directly observed as a reactive intermediate. The reactivity of the photorearrangement depended on the
p-substituents on the phenoxy group.
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Yutaka Ukaji, Shoichi Takenaka, Yoshie Horita, Katsuhiko Inomata
2001 Volume 30 Issue 3 Pages
254-255
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The asymmetric nucleophilic addition of Reformatsky-type reagent to imines, which were prepared from aldehydes and 2-aminophenols, was achieved by the use of diisopropyl (
R, R)-tartrate as a chiral auxiliary to afford the corresponding
β-amino acid ester derivatives with excellent enantioselectivities. In order to realize reproducible higher stereoselection, the addition of a small amount of water was crucial.
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Koichi Fukuhara, Satoshi Todo, Kiyoka Matsuzaki, Minoru Maruta, Takahi ...
2001 Volume 30 Issue 3 Pages
256-257
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Conformational transformation of nonionic surfactants H(CH
2)
10(OCH
2CH
2)
mOH (C
10E
m) (
m = 6 and 7) in the solid state with addition of water was studied at −20 °C by IR spectroscopy. For C
10E
7, the conformation of the alkyl part adjacent to the oxyethylene chain transforms from
trans to
gauche with addition of water at about 90 wt% of surfactant. No conformational transformation was observed for C
10E
6 with addition of water.
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Junji Kawakami, Mari Yoneyama, Daisuke Miyoshi, Naoki Sugimoto
2001 Volume 30 Issue 3 Pages
258-259
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Structural features of a stable hairpin DNA with a tetraloop, dAGGC(TTCG)GCCT (CORE), and its six abasic mutants were investigated by the melting behavior of the UV absorption and circular dichroism spectra. The CORE and an abasic mutant at the second position of the loop exhibit considerable thermodynamic stability and have similar structural features suggesting the same folding with an identical base orientation of the two hairpin DNAs except for the second base in the loop.
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Eduardo H. Gacho, Toshio Naito, Tamotsu Inabe, Takamitsu Fukuda, Nagao ...
2001 Volume 30 Issue 3 Pages
260-261
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The
C2v isomer of Co(1,2-Nc-
C2v) (1,2-Nc = 1,2-naphthalocyaninato) has been isolated by fractional crystallization of the crude mixture of four isomers (
C4h,
Cs,
C2v,
D2h), and its crystal structure, electronic absorption, and magnetic circular dichromism have been discussed.
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Toshiyuki Itoh, Eri Akasaki, Kazutoshi Kudo, Shohei Shirakami
2001 Volume 30 Issue 3 Pages
262-263
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The lipase-catalyzed enantioselective acylation of allylic alcohols in an ionic liquid solvent was demonstrated; the reaction was significantly dependent on the counter anion of the imidazolium salt and good results were obtained when the reaction was carried out in [bmim]PF
6 or [bmim]BF
4 as solvent. We also first demonstrated that it was possible to repeatedly use the enzyme in the ionic liquid solvent system.
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Jong Wook Bae, Jae Sung Lee, Kyung Hee Lee, Byeongno Lee, Duck Joo Yan ...
2001 Volume 30 Issue 3 Pages
264-265
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In disproportionation of CCl
4 with CH
4 into CH
3Cl and CHCl
3, platinum supported on SrCO
3, SiO
2, MgO and MgAl
2O
4 showed stable activity and high selectivities around 700 K, providing a novel disposal method of ozone-depleting CCl
4.
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Tomoji Ozeki
2001 Volume 30 Issue 3 Pages
266-267
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The crystal structure of a sodium paradodecatungstate has been analyzed using high-energy X-rays at the Spring-8 BL02B1 beamline, aiming at an absorption free structure determination of polynuclear heavy metal compounds. Effect of the use of high-energy synchrotron radiation has been demonstrated and the result was of sufficient quality.
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Tohru Yamada, Kentaro Hashimoto, Yasunori Kitaichi, Kyosuke Suzuki, Ta ...
2001 Volume 30 Issue 3 Pages
268-269
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In the presence of a catalytic amount of dioxo(tetramesitylporphyrinato)ruthenium(VI) complex, nitrous oxide (N
2O) oxidized trisubstituted olefins into the corresponding epoxides in good-to-high yields with high selectivities.
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Hirotaka Ikeda, Takayuki Kato, Satoshi Inagaki
2001 Volume 30 Issue 3 Pages
270-271
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Analysis of the bond interactions at the transition state of the electrocyclic reaction of cyclobutene shows significant participation of the inward- and outward-rotating σ bonds geminal to the reacting centers. Electron-donating capabilities of the inward-rotating σ bonds are predicted to accelerate the reactions. The prediction of the torquoselectivities is confirmed by calculated preference of the inward rotations of the silyl and trimethylsilyl groups in cyclobutene, iminocyclobutene, and cyclobutenone.
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Osamu Hayashida, Aki Matsuo, Yasuhiro Aoyama
2001 Volume 30 Issue 3 Pages
272-273
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Double helical DNAs such as plasmid DNA pBR322 and calf thymus (CT) DNA were firmly bound to calix[4]resorcarene-based saccharide bundles, as demonstrated by the electrophoretic, circular dichroism (CD) spectroscopic, dynamic light scattering, and thermal-stability criteria. The long-chain cluster compound interacts with DNAs more effectively than a shorter one.
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Yu Chen, Yulin Lam, Soo-Ying Lee
2001 Volume 30 Issue 3 Pages
274-275
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A new solid phase synthesis of 3,6-disubstituted pyridazine derivatives, resulting from the reaction of polymer-bound sodium benzenesulfinate with α-bromoketone substrates followed by condensation with hydrazine, is described. Mild basic conditions for the condensation reaction simultaneously release the desired product from the solid support. The crystal structure of 3,6-bis(
p-chlorophenyl)pyridazine is reported.
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R. J. Zhang, K. Z. Yang, J. B. Li, J. F. Hu
2001 Volume 30 Issue 3 Pages
276-277
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Sm(TTA)
3Phen domains in a ring pattern were assembled by the Langmuir–Blodgett (LB) film technique. The domain pattern was observed by Brewster angle microscopy (BAM) at air/liquid interface and by atomic force microscopy (AFM) on mica. Under the electrostatic forces, Sm(TTA)
3Phen molecules move towards and nucleate at the edge of the stearic acid (SA) domains exhibiting gradient electric field, resulting in the formation of ring domains of the samarium complex.
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