-
C. Akira Horiuchi, Keiko Ochiai, Hirotada Fukunishi
1994 Volume 23 Issue 2 Pages
185-188
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Reaction of α,β-unsaturated ketones and electron-deficent unsaturated esters with iodine-cerium(IV) ammonium nitrate in alcohols (methanol, ethanol, or 1-propanol) under 0 °C-reflux gave the corresponding β-alkoxy-α-iodoketones and esters in good yields. In the case of acetonitrile and acetonitrile-water, β-nitrato- and β-hydroxy-α-iodo compounds were obtained, respectively.
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Keiji Yamamoto, Satoru Momose, Masakazu Funahashi, Satoshi Ebata, Hide ...
1994 Volume 23 Issue 2 Pages
189-192
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The relevance of a new diphosphinite, which holds a natural bite angle around 120° in a catalyst complex, to the Rh(I)-catalyzed hydroformylation of certain olefins is examined, exhibiting a high turnover frequency (TOF) as compared with a typical 1,2-bis(diphenylphosphino)ethane with a bite angle around 85°.
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Tsunenori Nozawa, Takashi Katano, Masatake Kudoh, Masayuki Kobayashi, ...
1994 Volume 23 Issue 2 Pages
193-196
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Both reaction centers containing and lacking cytochrome
c were obtained from a new halophilic photosynthetic bacterium
Rhodospirillum (R.) sodomense. The cytochrome
c has a very low reduction potential not to be reduced by Na-ascorbate. The special pair bands in the both reaction centers exists at around 850 nm, some 20 nm to the blue of that of a nonhalophilic species,
R. rubrum.
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Isao Mochida, Yoshinori Yasumoto, Yoshiro Watanabe, Hiroshi Fujitsu, Y ...
1994 Volume 23 Issue 2 Pages
197-200
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A PAN-ACF with large surface area was found to enhance dehydrochlorination of 1,2-dichloroethane into vinylchloride in selectivity above 99% at a conversion level of 21 to 63% in the temperature range of 300–350 °C. The ACF showed stable activity at 325 °C for 100 h. In contrast, other carbon materials were found to show either low activity or short life, although their selectivities were fairly high.
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Seiichi Inokuma, Toshiaki Yasuda, Sachiko Araki, Shigefumi Sakai, Jun ...
1994 Volume 23 Issue 2 Pages
201-204
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A new doubly armed crown compound fused in a cyclophane skeleton was prepared by intramolecular [2 + 2] photocycloaddition. The compound efficiently extracted Ag
+ with excellent selectivity in a liquid-liquid system, and the high Ag
+-affinity was not reduced even at low pH region.
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Tatsuo Arai, Osamu Takahashi, Tomoyuki Asano, Katsumi Tokumaru
1994 Volume 23 Issue 2 Pages
205-208
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3-Styrylperylene undergoes one-way cis → trans photoisomerization in the triplet state through a quantum chain process. The conversion of cis to trans triplet state was directly observed by laser spectroscopy to proceed with an activation energy of 6.6 kcal mol
−1. This finding clearly demonstrates that in the series of styrylarenes, ArCH=CHPh, lowering of the triplet excitation energy of Ar group alters the mode of isomerization from two-way to one-way.
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Kazuo Nagasawa, Keiko Ohhashi, Asami Yamashita, Keiichi Ito
1994 Volume 23 Issue 2 Pages
209-212
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Esterification of a variety of acid bromides having even steric bulkiness with t-BuOH/activated basic alumina gave the corresponding t-butyl esters in good to excellent yields. In the case of chiral acid bromides, no racemization has been ascertained for the first time.
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Jun-ichiro Setsune, Ken-ichi Wada, Hirofumi Higashino
1994 Volume 23 Issue 2 Pages
213-216
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N
21,N
22-(1,2-Diphenyletheno)-bridged octaethylporphyrin hydroperchlorate underwent one-electron reduction to give a thermally stable phlorin radical when treated with 1-benzyl-1,4-dihydronicotinamide (BNAH). BNAH reduced, in the presence of acid, the same porphyrin to a two-electron reduced product, N
21,N
22-(1,2-diphenyletheno)octaethyl-15
H-phlorin, in contrast to the NaBH
4-reduction to N
21,N
22-(1,2-diphenyletheno)octaethyl-5
H-phlorin.
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Shu Kobayashi, Takashi Kawasuji, Nobuaki Mori
1994 Volume 23 Issue 2 Pages
217-220
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In the presence of a novel chiral catalyst system consisting of tin(II) triflate, a chiral diamine, and tin(II) oxide, highly enantioselective aldol reactions of the silyl enol ether of S-ethyl ethanethioate or S-ethyl propanethioate with aldehydes proceeded smoothly to afford the aldol adducts in high yields.
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Soichiro Kyushin, Hiroyuki Yamaguchi, Toshiaki Okayasu, Yusuke Yagihas ...
1994 Volume 23 Issue 2 Pages
221-224
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The Si-Si bond cleavage reaction of decaisopropylbicyclo[2.2.0]hexasilane with PdCl
2(PhCN)
2 gave
cis- and
trans-1,4-dichlorocyclohexasilanes. X-ray crystallography of these products show sterically distorted chair conformations of the Si
6 rings. The
cis- and
trans-cyclohexasilane show rather different absorptions in the UV spectra. By treatment with sodium, both isomers reproduced the bicyclo[2.2.0]hexasilane quantitatively.
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Yayoi Yokoyama, Takeshi Iwai, Yasushi Yokoyama, Yukio Kurita
1994 Volume 23 Issue 2 Pages
225-226
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A photochromic furylfulgide, (
E)-2-[1-(2,5-dimethyl-3-furyl)-2-methylpropylidene]-3-isopropylidenesuccinic anhydride, was shown to be chiral. Its enantiotopomerization process was observed by variable temperature
1H NMR measurement, and
ΔH≠(obs) was 52.9 ± 8.1 kJ mol
−1. AM1 calculation showed
ΔH≠(calc) to be 51.5 kJ mol
−1.
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Masahiro Higuchi, Norihiko Minoura, Takatoshi Kinoshita
1994 Volume 23 Issue 2 Pages
227-230
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Photo-induced structural changes were observed for an aggregate composed of amphiphilic sequential polypeptides with an azobenzene moiety in the main chain. The polypeptides associated with each other and formed micelle in aqueous solution in the dark. Photo-isomerization of the azobenzene moiety of the polypeptides induced a deaggregation of the micelle, via the bending structure formation of the polypeptide at the azobenzene moiety.
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Nobuharu Iwasawa, Masatoshi Saitou
1994 Volume 23 Issue 2 Pages
231-234
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The addition reaction of organolithium or Grignard reagents to pentacarbonyl[methoxy(methyldiphenylsilyl)carbene]molybdenum is examined, and either (
E)- or (
Z)-vinylsilanes are obtained with high selectivities depending on the reaction conditions.
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Keiichi Tomishige, Kiyotaka Asakura, Yasuhiro Iwasawa
1994 Volume 23 Issue 2 Pages
235-238
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In-situ EXAFS technique was successful by applied for the first time to observe the molecular reaction intermediate for NO–H
2 reaction on highly active Rh–Sn/SiO
2 catalysts. The EXAFS data, with the aid of FTIR, revealed the existence the bent-type NO with the bond distance of 0.256 nm with Sn atoms (Rh–NO···Sn) on the bimetallic surface in the steady-state reaction conditions. The tilted NO was dissociated to form Sn–O bond at 0.205 nm.
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Hiroo Shirai, Hidenori Tanaka, Hiroki Sakaguchi, Gin-ya Adachi
1994 Volume 23 Issue 2 Pages
239-242
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Hydrogen permeabilities of V
2O
5/Cu multilayered films having various lengths of the perimeter of the V
2O
5/Cu interface were investigated. Although the hydrogen permeability of the multilayered film increased with the length of the perimeter, it increased only slowly when the length of the perimeter exceeded 9.6 × 10
−2 m since the hydrogen concentration of the V
2O
5 layer is saturated at the region near the V
2O
5/Cu interface.
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Masakazu Yoshikawa, Kiyoshi Fujimoto, Hirokazu Kinugawa, Toshio Kitao, ...
1994 Volume 23 Issue 2 Pages
243-246
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Permeation of CO
2 was investigated by using synthetic polymeric membranes having a tertiary amine moiety, 2-(N,N-dimethyl)aminoethoxycarbonyl group. Permselectivity of the present membranes for CO
2 was achieved. Through the DMAEMA/AN-199 membrane, separation factor towards CO
2 for CO
2/N
2 separation ranged from 60 to 90.
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Koki Matsubara, Teruaki Mukaiyama
1994 Volume 23 Issue 2 Pages
247-250
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In the presence of a catalyst generated from SnCl
4 and AgClO
4, or Yb(OTf)
3 various glycosyl azides are synthesized in high yields with complete stereoselectivities from peracylated sugars and trimethylsilyl azide by choosing a suitable solvent such as dichloromethane or nitromethane.
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Issei Iwamoto, Hitoshi Tanihara, Masaaki Kawahara, Soichi Otsuka, Kazu ...
1994 Volume 23 Issue 2 Pages
251-254
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The decomposition of PAN in the presence of nitric oxide and propene in the air was investigated at 30 °C under dark conditions. The number of nitric oxide molecules oxidized per each PAN molecule decomposed varied from 3.7 to above 5 with increase of the ratio of initial concentration of propene to that of nitric oxide.
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Kazuo Takimiya, Tetsuo Otsubo, Fumio Ogura, Hidetomo Ashitaka, Kazuhir ...
1994 Volume 23 Issue 2 Pages
255-258
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The title heteroaromatics have been synthesized by Wittig-Hornor reactions of the appropriate heterocyclic dialdehydes with diethyl pyranyl- and thiopyranyl-phosphonate. Cyclic voltammetry indicated their strong π-donor abilities, and some TCNQ complexes showed high electrical conductivities. They were also found to have large third-order nonlinear optical susceptibilities.
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Tamotsu Takahashi, Denis Y. Kondakov, Noriyuki Suzuki
1994 Volume 23 Issue 2 Pages
259-262
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Zirconium-alkyne complexes or zirconacyclopentenes, which were easily prepared in situ from alkynes, reacted with acrolein diethylacetal to afford vinyl ether derivatives. The C–C bond formation proceeded exclusively at β-position of the α,β-unsaturated acetal. Zirconium catalyzed C–C bond formation reactions of α,β-unsaturated acetals with EtMgBr also proceeded at β-position exclusively.
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Noriyuki Ikehara, Kouji Hara, Atsushi Satsuma, Tadashi Hattori, Yuichi ...
1994 Volume 23 Issue 2 Pages
263-264
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The rate of acetic acid formation in CO
2 hydrogenation on Ag-Rh/SiO
2 catalyst took two maxima at 463 K and 553 K. At 463 K, the rate was much faster than that of C
2-oxygenates formation in CO hydrogenation. It was suggested that, at lower temperature, acetic acid is formed through the direct incorporation of adsorbed CO
2.
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Masataka Yokoyama, Akira Toyoshima, Takahiro Akiba, Hideo Togo
1994 Volume 23 Issue 2 Pages
265-268
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Some
C-ribo-nucleosides having typical aromatic heterocycles as base moiety were synthesized from the stereoselective addition of lithium salt of aromatic heterocycles to the protected
D-ribose followed by the stereospecific cyclization under Mitsunobu conditions.
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Kohshin Takahashi, Kei Hashimoto, Teruhisa Komura, Kazuhiko Murata
1994 Volume 23 Issue 2 Pages
269-272
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The Al/dye/Au sandwich-type photovoltaic cell with a mixed solid of 5,10,15,20-tetraphenylporphyrinatozinc (Zntpp) and 3-ethyl-5-[(3-ethyl-2(3H)-benzothiazolylidene)ethylidene]-2-thioxo-4-thiazolidinone (MC) exhibits a remarkably large energy conversion yield and a better spectral match with a solar spectrum, compared with a pure Zntpp or a MC solid.
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Tony D. James, Kazutaka Murata, Takaaki Harada, Keiko Ueda, Seiji Shin ...
1994 Volume 23 Issue 2 Pages
273-276
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The cholesterylphenylboronic acid (
1) and its complexes with mono saccharides (2 : 1;
1/monosaccharide) were prepared. Many of the isolated complexes form gels in a variety of solvents, some of which display D
vs L chiral discrimination. This is the first example of chiral discrimination in a saccharide based gel system.
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Wenxin Li, Yoshitaka Ohkubo, Shizuko Ambe, Yoshio Kobayashi, Masako Iw ...
1994 Volume 23 Issue 2 Pages
277-280
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Nuclear reactions of
93Nb,
181Ta, and
197Au induced by secondary neutrons produced by irradiation of a thick stainless steel target with 40 MeV/nucleon
40Ar ions were investigated by off-line γ-ray spectroscopy. Yields of the radioactive products have been determined relative to that of
24Na produced by the
27Al(n,α)
24Na reaction. The slopes of the mass distributions deduced from the experimental data are independent of the target species. Up to 7 nucleons were removed from the target nuclei, indicating significant presence of the neutrons with energies higher than 70 MeV.
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Hiroshi Yokoi, Tsuyoshi Mitani, Yasuyoshi Mori, Satoshi Kawata
1994 Volume 23 Issue 2 Pages
281-284
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Computer simulation analysis of the experimental plots of effective magnetic moment against pH for aqueous solutions of iron(III) and either
L-tartaric acid or citric acid at different concentration ratios has first given the whole aspect of complex formation in a wide pH range 1 to 13 at room temperature. Formation of various kinds of poly- and mono-nuclear complexes has been elucidated in these solutions.
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Shin-ichi Mitsubori, Takayuki Ishida, Takashi Nogami, Hiizu Iwamura
1994 Volume 23 Issue 2 Pages
285-288
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The intramolecular magnetic interactions between 1/2 spins of two oxovanadium(IV) ions were studied in the complexes L[VO(hfac)
2]
2 (hfac = hexafluoroacetylacetonate, L = 4-methyl-, 4,6-dimethyl-, 4-amino- and unsubstitute-pyrimidines, and quinazoline). The magnetic measurements revealed that the vanadium spins were ferromagnetically coupled through the pyrimidine bridges with
J/
kB = 1.1–2.7 K. The intermolecular ferromagnetic interaction was found in the case of L = pyrimidine.
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Yujiro Hayashi, Hiroyuki Ushio, Koichi Narasaka
1994 Volume 23 Issue 2 Pages
289-292
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6-
t-Butyldimethylsilyl-7-methylthiobicyclo[3.2.1]oct-6-en-8-ol derivatives prepared from the [2+2] cycloadducts of 1-
t-butyldimethylsilyl-2-methylthioacetylene and 2-cyclohexenones are rearranged by the treatment with BF
3·OEt
2 into two types of bicyclo[3.3.0]octane compounds, bicyclo[3.3.0]oct-3-en-2-one or 2-methylenebicyclo[3.3.0]oct-3-ene derivatives selectively, depending on the substituent at C-1 position.
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Yasuro Kawano, Keiko Sugawara, Hiromi Tobita, Hiroshi Ogino
1994 Volume 23 Issue 2 Pages
293-296
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Photolysis of CpFe(CO)
2SiMe
3 (Cp = η-C
5H
5) in the presence of a new alkylgermane
tBuGeH
3 afforded a mono(μ-germylene)diiron complex Cp
2Fe
2(CO)
3(μ-GeH
tBu) (
4) and a bis(μ-germylene)diiron complex Cp
2Fe
2(CO)
2(μ-GeH
tBu)
2 (
5). The structure of
4 was determined by X-ray crystallography.
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Masatoshi Asami, Kenji Usui, Sohmei Higuchi, Seiichi Inoue
1994 Volume 23 Issue 2 Pages
297-298
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A chiral catalyst prepared from nickel(II) chloride and chiral β-diamine, (
S)-1-pentyl-2-anilinomethylpyrrolidine, was found to be effective for the enantioselective conjugate addition of diethylzinc to chalcones to afford corresponding β-substituted ketones in up to 89% ee.
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Kohta Yamada, Isamu Uchida
1994 Volume 23 Issue 2 Pages
299-302
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The spontaneous oxidation of Co metal in a molten (62Li + 38K)mol% carbonate mixture with an oxygen partial pressure has been characterized at 923 K. When a thin Co film electroplated on a gold substrate was immersed into the melt, the open circuit potential (OCP) decayed gradually, indicating well-defined, three potential plateaus, and the oxide films produced at each potential plateau were identified by X-ray diffraction. The surface products at the first and second plateaus were Co
IIO, but the film impedance decreased rapidly at the second plateau, suggesting the formation of the lithiated Co
IIO. It was found that LiCo
IIIO
2 was formed at the third OCP plateau (ca. −0.4 V vs.(1 : 2)O
2/CO
2 reference electrode) and OCP reached to the Nernst potential of oxygen electrode reaction after the completion of LiCoO
2 formation.
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Koichiro Jitsukawa, Kouji Iwai, Hideki Masuda, Hisanobu Ogoshi, Hisahi ...
1994 Volume 23 Issue 2 Pages
303-306
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The bis-(N-pyridoxy-
L-phenylalaninato)cobalt(III) complex exhibiting an anomalous assembly of aromatic rings around the pyridoxy 2′-methyl group has been synthesized and characterized by
1H-NMR spectroscopy and X-ray analysis. The
1H-NMR spectrum of the complex in D
2O, methanol-d
4 and dimethylsulfoxide-d
6 revealed peculiar upfield shift in 2′-methyl group. The detailed examination of the crystal structure demonstrated that the two C–H bond vectors of 2′-methyl group were directed toward the planes of the pyridoxy pyridine and phenylalanyl benzene rings, respectively. These findings indicate the induced assembly of aromatic rings through a CH···π interaction.
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Kazuko Matsumoto, Hiroshi Urata
1994 Volume 23 Issue 2 Pages
307-310
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Synthesis of the first platinum blue complex with 2,2′-bipyridine ligand, [Pt
4(bpy)
4(GI)
4]
5+ (bpy = 2,2′-bipyridine; GI = glutarimidate) and its solution behavior are reported.
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Hideaki Sato, Toru Shimizu, Yoshinori Murakami, Masahiro Hatano
1994 Volume 23 Issue 2 Pages
311-314
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Catalytic efficiency,
kcat/
Km, for 7-ethoxycoumarin
O-deethylation was remarkably enhanced up to 6-fold by mutations at Lys250, Arg251 or Lys253 in cytochrome P450 1A2, while that for methanol hydroxylation was not changed by the same mutations. It is thus suggested that this ionic site is located at or near one of the hydrophobic substrate-interacting sites of this enzyme.
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Koichi Narasaka, Takanori Shibata
1994 Volume 23 Issue 2 Pages
315-318
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1-(ω-Alkenyl)-1,2-propadienyl sulfide reacts with Fe(CO)
4(NMe
3) under photo irradiation conditions and a cyclized and carbonylated η
3-allyl mononuclear iron complex is isolated. On the other hand, the reaction of 1-(ω-alkynyl)-1,2-propadienyl sulfides and Fe(CO)
4(NMe
3) also proceeds by photo irradiation to give various bicyclic dienones through the η
3-allyl iron complex.
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Nobuhito Imanaka, Susumu Banno, Gin-ya Adachi
1994 Volume 23 Issue 2 Pages
319-322
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Copper oxide and scandium oxide were mixed with p-type semiconducting nickel oxide and its NO
2 sensing performance was investigated. By mixing copper oxide with nickel oxide, the response of the oxide for NO
2 was improved. Further Sc
2O
3 mixing with nickel copper oxide greatly enhanced the sensing performance. Especially, the addition of scandium oxide into nickel copper oxide was considerably effective to sense only NO
2 in the nitrogen oxides existing atmosphere.
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Rimo Xi, Bateer Wang, Yoshiki Ozawa, Masaaki Abe, Kiyoshi Isobe
1994 Volume 23 Issue 2 Pages
323-326
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A mixed metal tetranuclear complex with two Mo
VI(μ-SMe)
3Rh
III groups, [{Cp
*Rh(μ-SMe)
3Mo(O)
2}
2(μ-O)] has been obtained from the reaction of the triple-cubane type oxide cluster [(Cp
*Rh)
4Mo
4O
16] with MeSH. The complex has been characterized by X-ray analysis and variable-temperature
1H NMR spectroscopy. The latter has revealed that the complex exists as a mixture of isomers which show interconversion due to the inversion at the pyramidal sulfur center.
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Noboru Suzuki, Mikio Sanada, Ken-ichi Iimura, Takeshi Nozawa, Hiroshi ...
1994 Volume 23 Issue 2 Pages
327-330
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Alumina and silicon carbide powders were ground in water, butanol, benzene and hexane using planetary ball mill, and the gas phase inside the mill pot was analyzed by a gas chromatograph. The effect of liquid media on the grindability varied with the kind of feed powders, and the main product in the gas phase was hydrogen. The amount of it was in the order of benzene ≤ butanol < hexane for alumina and no gas product was detected for water. However, that for silicon carbide was considerable in water and in butanol, and was very small in benzene and in hexane. The mechanism of these mechanochemical reactions was discussed.
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Taisei Nishimi, Masami Tachikawa, Tadashi Maeda, Yuichi Ishikawa, Toyo ...
1994 Volume 23 Issue 2 Pages
331-334
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Equimolar mixtures of cyclam amphiphiles and malonate amphiphiles produced uniformly paired bilayers. Absorption spectra and X-ray diffraction measurements showed that molecular alignments were determined by combinations of the alkyl chain length of paired bilayer components as in the respective single-component bilayers.
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Masami Ando, Seiichi Suto, Takahiro Suzuki, Takashi Tsuchida, Chiaki N ...
1994 Volume 23 Issue 2 Pages
335-338
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A thick film sensor element fabricated with 0.5 wt% Au-loaded WO
3 was found to exhibit excellent sensing properties to H
2S and CH
3SH in air at 300 °C. The element was sensitive to very dilute H
2S and CH
3SH, the detection limits of the gases being 20 ppb and 30 ppb, respectively.
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Hideki Minoura, Tsutomu Kajita, Kouichi Yamaguchi, Yasutaka Takahashi, ...
1994 Volume 23 Issue 2 Pages
339-342
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A novel method, combining chemical and electrochemical processes and involving a principle of supersaturation of the solutions, has been offered for the deposition of CdS films. A wider choice of sulphur sources and versatility in film formation are the attractive features of this method.
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Tooru Fujiwara, Toshiaki Iwasaki, Jun Miyagawa, Takeshi Takeda
1994 Volume 23 Issue 2 Pages
343-346
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The Lewis acid-promoted reaction of 2-phenylthiocyclobutanemethanol derivatives with silyl nucleophiles gave the corresponding trisubstituted olefins with high stereoselectivity in good yields. It is suggested that the reaction proceeds via the thionium ion intermediate.
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Masashi Kijima, Katsuhiko Nakazato, Takeo Sato
1994 Volume 23 Issue 2 Pages
347-348
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Benzyl ligand of Benzylbis(dimethylglyoximato)pyridine cobalt complexe was selectively converted to 3,5-diphenyl-1,2,4-oxadiazole by a reaction with alkyl nitrite under irradiation of visible light. The reaction proceeds via an in situ formation of an oxime and a nitrile oxide.
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Shoichi Katsuta, Koichi Saitoh
1994 Volume 23 Issue 2 Pages
349-350
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Partition coefficients of neutral acetylacetonates of Cr(III), Co(III), Rh(III), and Pd(II) between sodium dodecyl sulfate micelles and water were measured by micellar electrokinetic chromatography. The partition coefficients were much larger than those obtained between heptane and water. It was explained in terms of hydration of the complexes in the micellar phase.
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Michito Shiotsuka, Yoshihisa Matsuda
1994 Volume 23 Issue 2 Pages
351-354
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Halogeno(2-phenyl-3,4-dimethylphosphorine)copper(I) complexes were synthesized and characterized by
31P-,
13C-NMR spectroscopy, and X-ray crystallography. It was revealed that the phosphorine coordinates to copper(I) ions as a monodentate ligand and undergoes π-back donation to stabilize Cu–P bonding.
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Yoshiro Yonezawa, Tomoo Sato, Itaru Kawabata
1994 Volume 23 Issue 2 Pages
355-358
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An application of chitosan for the polymer support to fabricate thin gold films was examined. When a thin film of chloroauric acid salt of chitosan was irradiated with UV-light in air, a clear gold mirror was formed. It is suggested that the gold mirror is made of aggregated colloidal gold particles stabilized by chitosan.
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Toshikazu Ibata, Muhong Shang, Tetsuo Demura
1994 Volume 23 Issue 2 Pages
359-362
Published: 1994
Released on J-STAGE: April 14, 2006
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The reaction of
p-chloronitrobenzene with
N-methylpyrrolidine under high pressure gave demethylation product and ring opening products through quaternary ammonium chloride intermediate formed by the S
NAr reaction. On the other hand, the reactions with
N-methylpiperidine and
N-methylmorpholine gave only demethylation products. The reactions of
o-chloronitrobenzene and 2,4-dichloronitrobenzene with above amines gave similar results.
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Kimihisa Yamamoto, Kenichi Oyaizu, Toshio Asada, Hiroyuki Nishide, Eis ...
1994 Volume 23 Issue 2 Pages
363-366
Published: 1994
Released on J-STAGE: April 14, 2006
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Oxidative polymerization of benzene with 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) under strongly acidic conditions produced structure-defined poly(1,4-phenylene) (PP). Addition of CF
3SO
3H prior to the stoichiometric oxidation enabled the efficient formation of the protonated σ-complex of benzene through which linear PP (degree of the polymerization was ca. 30) was produced by the subsequent addition of DDQ.
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Tetsuo Osa, Yoshitomo Kashiwagi, Yoshinori Yanagisawa
1994 Volume 23 Issue 2 Pages
367-370
Published: 1994
Released on J-STAGE: April 14, 2006
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A preparative electroenzymatic oxidation of alcohols was successfully carried out on a poly(acrylic acid)-coated graphite felt electrode ter-immobilizing ferrocene, diaphorase and alcohol dehydrogenase in the domain of the poly(acrylic acid) layer in a 1 mM NADH / phosphate buffer (pH 7.2) with high stereoselectivity ( >96%), high isolated yield ( >90%) and high current efficiency ( >89%).
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Akeo Takahashi, Yasushi Mizobe, Masanobu Hidai
1994 Volume 23 Issue 2 Pages
371-374
Published: 1994
Released on J-STAGE: April 14, 2006
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Diruthenium complex [Cp
*Ru(μ-SPr
i)
3RuCp
*] (Cp
* = η
5-C
5Me
5) reacted with PhCH
2Br to give [Cp
*RuBr(μ-SPr
i)
2RuCp
*(SPr
i)] (
3) and PhCH
2CH
2Ph. Treatment of
3 with HC≡CR (R = Bu
t, 4-MeC
6H
4) or H
2 resulted in the formation of [Cp
*RuBr(μ-SPr
i)
2RuCp
*(C≡CR)] (
4) or [Cp
*RuBr(μ-SPr
i)
2RuCp
*H] (
5), respectively. Complex
5 was further converted into [Cp
*RuR(μ-SPr
i)
2RuCp
*H] (
6a: R = PhCH
2;
6b: R = PhCH
2CH
2) by the reaction with RMgX (X = Cl, Br). In contrast to the inertness of
6b,
6a dissolved in benzene underwent dinuclear reductive elimination to give PhMe in high yield at room temperature, accompanied by the generation of [Cp
*Ru(μ-SPr
i)
2RuCp
*].
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