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Makoto Yasuda, Tatsuya Fujibayashi, Ikuya Shibata, Akio Baba, Haruo Ma ...
1995 Volume 24 Issue 3 Pages
167-168
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Chlorotrimethylsilane combined with acetonitrile has characteristically promoted allylation of carbonyl compounds by diallyldibutyltin to produce a variety of homoallyl silyl ether in good yields, while the addition of HMPA or LiCl disturbed the allylation.
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Tetsuya Ueno, Haruhiko Toda, Masafumi Yasunami, Masaaki Yoshifuji
1995 Volume 24 Issue 3 Pages
169-170
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1-Fluoro- and 1,3-difluoroazulenes were synthesized by the reaction of azulene with
N-fluoropyridinium salts in acetonitrile. Methyl azulene-1-carboxylates were also fluorinated to give the corresponding 3-fluoro derivatives. On the basis of the UV-visible absorption spectra, the fluorine atom acts as an electron-donating group to the azulene π-system due to the +Iπ effect.
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Akio Murai, Yuko Yoshizawa, Tetsuya Toida, Makoto Sakamoto, Tsutomu Mo ...
1995 Volume 24 Issue 3 Pages
171-172
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Potato tuber tissues, when infected with
Phytophthora infestans or treated with arachidonic acid, generated H
2O
2 which then elicited accumulation of the phytoalexins. The plant tissues, when treated with H
2O
2, induced phytoalexin production, indicating that H
2O
2 is a dynamic substance for triggering the phytoalexin production in potato.
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Tsutomu Monden, Tetsuya Toida, Hideshi Nakamura, Norio Sato, Akio Mura ...
1995 Volume 24 Issue 3 Pages
173-174
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On treatment with hydrogen peroxide, potato tubers released an endogenous elicitor for phytoalexin production. The homogenous active substance, purified by gel filtration and anion exchange column chromatographies, is an acidic polysaccharide with MW 9,200. This constitutes the first isolation of a self-induced endogenous elicitor.
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Dongjin Qian, Hiroo Nakahara, Kiyoshige Fukuda, Kongzhang Yang
1995 Volume 24 Issue 3 Pages
175-176
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Monolayers of a newly synthesized long-chain complex of europium(III) and its mixtures with octadecane or arachidic acid were investigated. Using the conventional LB and horizontal methods, the mixed monolayers could be deposited on solid supports. For the complex in monolayer assemblies, the emission probabilities from higher excited state
5D
1 than
5D
0 were remarkably enhanced in comparison with those in the solution or crystalline.
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Viktor Peikov, Ryo Sasai, Kiwamu Yamaoka
1995 Volume 24 Issue 3 Pages
177-178
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The electric properties of colloidal β-FeOOH particles were investigated at a low particle concentration and at various ionic strengths by reversing-pulse electric birefringence. A dip in the electric birefringence signal was observed upon pulse reversal. The electric field orientation of the particles is due mostly to ion-fluctuation dipole moment parallel to the symmetric axis of the prolate ellipsoid.
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Teruaki Mukaiyama, Isamu Shiina, Kaku Sakata, Takayuki Emura, Keitarou ...
1995 Volume 24 Issue 3 Pages
179-180
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Optically active 3,7-dibenzyloxy-4,8-di-
t-butyldimethylsiloxy-5,5-dimethyl-6-
p-methoxybenzyloxy-2-octanone (
2) has been synthesized by way of diastereoselective aldol reaction between 4-benzyloxy-5-
t-butyldimethylsiloxy-2,2-dimethyl-3-
p-methoxy-benzyloxypentanal (
3) and ketene silyl acetal
4 using MgBr
2·OEt
2 as a catalyst. The chiral pentanal
3 was synthesized either by asymmetric aldol reaction of both prochiral aldehyde
5 and ketene silyl acetal
4 using a chiral Lewis acid or by diastereoselective aldol reaction between the chiral aldehyde
6 derived from
L-serine and the lithium enolate derived from methyl isobutyrate.
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Isamu Shiina, Kouichi Uoto, Nobuaki Mori, Tomomi Kosugi, Teruaki Mukai ...
1995 Volume 24 Issue 3 Pages
181-182
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Optically active 7-
t-butyldimethylsiloxy-4,8-dibenzyloxy-6,6-dimethyl-5-
p-methoxybenzyloxy-2-cycloocten-1-one (
1) was synthesized from 3,7-dibenzyloxy-4,8-di-
t-butyldimethylsiloxy-5,5-dimethyl-6-
p-methoxybenzyloxy-2-octanone (
2) by way of intramolecular Reformatsky-type reaction using SmI
2.
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Ulrich Kux, Hironori Suzuki, Shigeru Sasaki, Masahiko Iyoda
1995 Volume 24 Issue 3 Pages
183-184
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Chlorination and bromination of EDT-TTF produced mainly the dihalogenated products (EDT-TTFCl
2 and EDT-TTFBr
2) with small amounts of the monohalogenated derivatives. In contrast, iodination of EDT-TTF afforded the monoiodinated derivative as the major product, together with the diiodinated compound. The molecular structures of EDT-TTFCl
2 and EDT-TTFBr
2 have been determined, and the conductivities of CT-complexes and radical salts of new donors reported here have been measured.
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Hideki Sakai, Ryo Baba, Kazuhito Hashimoto, Yoshinobu Kubota, Akira Fu ...
1995 Volume 24 Issue 3 Pages
185-186
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A titanium dioxide (TiO
2) microelectrode has been applied for selective photo-killing of a single cancerous T24 cell. The anodically polarized TiO
2 microelectrode effectively inactivated the T24 cell while in contact and under UV light irradiation; however, the cell was not killed when the microelectrode was located 10 μm away from the cell surface. Based on these results we concluded that the photogenerated holes and/or active oxygen species with short diffusion length are responsible for the cell death process.
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Taro Yamada, Hidehiro Uekusa, Yuji Ohashi
1995 Volume 24 Issue 3 Pages
187-188
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The crystal of (
trans-2-butenyl)bis(dimethylglyoximato)(pyridine)cobalt(III),
1, gradually changed its unit cell dimensions on exposure to a high flux xenon lamp. After about 2 hours exposure the change became significantly small. The lengths of a and c axes in the orthorhombic unit cell increased and decreased by 0.25 and 0.39 Å, respectively. The crystal structures before and after the irradiation clearly indicated that only the
trans-2-butenyl group was transformed to the
cis-isomer, the other part of the molecule being unaltered.
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Enrico Traversa, Patrizia Nunziante, Masatomi Sakamoto, Kazuaki Watana ...
1995 Volume 24 Issue 3 Pages
189-190
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Submicron perovskite-type LaFe
0.5Co
0.5O
3 powders were prepared by the thermal decomposition of a title cyanide-bridged heteronuclear complex. The decomposition of CN bridge begins at about 360 °C and the formation of perovskite-type oxide proceeds at a higher temperature with a gradual decomposition of carbonates. Perovskite-type LaFe
0.5Co
0.5O
3 with cubic structure was formed when the complex was calcined at 700 °C. By raising the calcining temperature to 900 °C, hexagonal phase was formed.
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Kenshu Fujiwara, Seiji Amano, Akio Murai
1995 Volume 24 Issue 3 Pages
191-192
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Construction of the sugar part of polycavernoside-A, which has been isolated as one of toxic principles from the red alga
Polycavernosa tsudai, is described starting from
L-fucose and D-xylose in order to elucidate the relative stereochemistry.
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Nicolas Brosse, Brigitte Jamart-Grégoire, Paul Caubère
1995 Volume 24 Issue 3 Pages
193-194
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Methylene cyclobutanols resulting from one step elimination-additions were transformed into new prostanoid-like derivatives with potential biological activity.
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Seiji Ujiie, Hiroko Uchino, Kazuyoshi Iimura
1995 Volume 24 Issue 3 Pages
195-196
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The thermal and mesomorphic properties of the new liquid crystalline binary systems, consisting of a nematic main chain liquid crystalline polymer and a nematic twin liquid crystal, have been studied. The liquid crystalline binary systems formed an induced smectic A phase, which was characterized by a uniaxial conoscopic figure, a fan texture, and a broad X-ray scattering peak at the wide angle.
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Kiitiro Utimoto, Toshiki Matsui, Tsutomu Takai, Seijiro Matsubara
1995 Volume 24 Issue 3 Pages
197-198
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A treatment of ethyl bromoacetate with two molar equivalent of samarium diiodide at −50 °C for 15 min in THF produces a β-oxoester enolate equivalent; the reagent reacts with ketones or aldehydes to give δ-hydroxy-β-oxoesters in excellent yields.
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De-Lie An, Kozo Toyota, Masafumi Yasunami, Masaaki Yoshifuji
1995 Volume 24 Issue 3 Pages
199-200
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A new type of phosphorus-selenium containing heterocyclic compound, 3,4,5-tris(2,4-di-
t-butyl-6-methoxyphenyl)-3,4,5-triselenoxo-1,2-diselena-3,4,5-triphospholane, was prepared and was allowed to react with amides to give the corresponding selenoamides in good yields.
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Yoshitane Kojima, Tetsushi Yamashita, Hiroyuki Miyake
1995 Volume 24 Issue 3 Pages
201-202
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The crystal structure of an 18-membered cyclic pseudopeptide containing
N,
N′-ethylene-bridged-(
S)-alanyl-(
S)-alanine and glycine was determined by X-ray diffraction analysis. Moreover, the structure of this pseudopeptide was examined by
1H NMR measurement in CD
3CN, and by molecular mechanics calculations.
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Yoshio Nagata, Kyozo Hirai, Kenji Okitsu, Takaaki Dohmaru, Yasuaki Mae ...
1995 Volume 24 Issue 3 Pages
203-204
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Chlorofluorocarbon CFC-113 was readily decomposed by ultrasonic irradiation in water with high efficiency to inorganics, such as CO, CO
2, HCl, and HF.
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Eiji Hayashi, Shoji Hara, Hiroyasu Shirato, Tsuyoshi Hatakeyama, Tsuyo ...
1995 Volume 24 Issue 3 Pages
205-206
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In the presence of HF-Et
3N complexes, the stereoselective cyclization of 5- and 6-alkenals takes place to give five- and six-membered cyclic fluoroalcohols, respectively.
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Akira Kimura, Kenji Funatsu, Taira Imamura, Hiroaki Kido, Yoichi Sasak ...
1995 Volume 24 Issue 3 Pages
207-208
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A novel porphyrin trimer linked vertically, Ru(OEP)(H
2PyP
3P)
2 1, was synthesized and characterized. The trimer showed intriguing MLCT bands. The preparation of a series of three porphyrin oligomers, Ru(OEP)(CO)(H
2PyP
3P)
2, Ru(OEP)(CO)(ZnPyP
3P)
3 , and [Ru(OEP)(CO)]
2(trans-H
2Py
2P
2P)
4 were also reported.
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Kiyoshi Kanamura, Soshi Shiraishi, Zen-ichiro Takehara
1995 Volume 24 Issue 3 Pages
209-210
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An artificial control of the morphology of lithium deposited in nonaqueous media was successfully accomplished by using the surface modification of the as-received lithium metal foil with HF treatment, to suppress the dendrite formation of lithium during the electrochemical deposition.
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Masaharu Tsuji, Masato Aizawa, Yukio Nishimura
1995 Volume 24 Issue 3 Pages
211-212
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Gas-phase ion-molecule reactions of CF
3+ with C
6H
6 and C
6H
5CH
3 have been studied at near-thermal energy by using an ion-beam apparatus. The C
7H
5F
2+(93.4 ± 2.2%) and C
6H
5+(6.6 ± 2.2%) ions are produced for the reaction with C
6H
6, while the C
8H
7F
2+(84.3 ± 2.4%), C
7H
8+(7.8 ± 1.5%), and C
7H
7+(7.9 ± 2.0%) ions are formed for the reaction with C
6H
5CH
3.
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Masahiro Mikuriya, Keiichi Nakadera
1995 Volume 24 Issue 3 Pages
213-214
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A pentanuclear iron(III) complex with 2,6-bis(salicylideneaminomethyl)-4-methylphenol (H
3L), [Fe
5(L)
2(O)(OH)
2(CH
3COO)
5(dmf)]·C
6H
6·2H
2O (dmf = dimethylformamide) has been synthesized and characterized by magnetic susceptibilities (5–300 K). The X-ray crystal structure analysis has demonstrated that it consists of pentanuclear units where the Fe
5 framework has roughly a rectangular-based pyramidal geometry.
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Hayao Imamura, Eisaku Suda, Tomohiro Konishi, Yoshihisa Sakata, Susumu ...
1995 Volume 24 Issue 3 Pages
215-216
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Europium and ytterbium catalysts separated on active carbon from a solution of lanthanide metals dissolved in liquid ammonia were found to be effective for oligomerization of alkynes. Selective cyclic dimerization and trimerization of propyne and ethyne to cyclohexadiene and benzene occurred during the oligomerization, respectively, in which the active catalysts were characterized as lanthanide imides induced by the thermal treatment.
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Takashi Miyazawa, Shin-ya Koshihara, Yusaburo Segawa, Mitsuo Kira
1995 Volume 24 Issue 3 Pages
217-218
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Non-resonant two-photon excitation induced dramatical change in the photoreaction pathways of stilbenes. Typically, irradiation of
cis-stilbene with 532 nm laser pulses caused only isomerization to
trans-stilbene in hexane at room temperature; the cyclization to dihydrophenanthrene was completely suppressed.
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Nobuhiro Takano, Masahito Nakabayashi, Noboru Takeno
1995 Volume 24 Issue 3 Pages
219-220
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The preparation of the palladium microparticles incorporated poly [
N-(5-hydroxypentyl) pyrrole] film-coated electrode is described. This electrode exhibited catalytic activity with regard to the hydrogenation of acetylene compound.
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Kozo Toyota, Kazuto Masaki, Tetsuya Abe, Masaaki Yoshifuji
1995 Volume 24 Issue 3 Pages
221-222
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Sterically protected 3,4-bis[(2,4,6-tri-
t-butylphenyl)phosphinidene]cyclobutenes reacted with bis(acetonitrile)dichloropalladium(II) to give the corresponding dichloropalladium complexes and the structure of one of the complexes was confirmed by X-ray crystallography. The complexes were utilized as a homogeneous catalyst in the coupling reaction of trimethylsilylacetylene and 1-bromo-4-nitrobenzene.
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Shigeru Shimada, Yuko Uchimaru, Masato Tanaka
1995 Volume 24 Issue 3 Pages
223-224
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A platinum complex-catalyzed dehydrogenative double silylation reaction of 1,2,4,5-tetrakis(dimethylsilyl)benzene with cyclic diynes gave ladder polymers quantitatively.
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Masayasu Akiyama, Yukihiro Hara, Hiroyuki Gunji
1995 Volume 24 Issue 3 Pages
225-226
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New
L-alanyl-
L-alanyl-β-(N-hydroxy)alanine-based tripodal hydroxamic acids have been prepared. They form stable chiral complexes with iron(III). The chirality of these complexes can be controlled by a tripodal molecule that links to the C-terminus or N-terminus of the same N-hydroxy peptide unit to give the Λ-
cis or Δ-
cis configuration about the metal ion, respectively.
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Sameh Saad Ali, Kiminori Maeda, Tohru Azumi
1995 Volume 24 Issue 3 Pages
227-228
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The photochemical reactions of 4-methyl-2-quinolinecarbonitrile (MQCN) with the enantiomers of 2-phenylpropionic acid (PPA) has been studied by CIDNP technique. The problem of chemical behavior discrimination of the enantiomers of PPA proposed by Hata
1 was examined. In contrast to the proposal of Hata, both (R) and (S) forms of PPA are shown to have radical intermediates in their reaction with MQCN.
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Teruaki Mukaiyama, Isamu Shiina, Kaname Kimura, Yuji Akiyama, Hayato I ...
1995 Volume 24 Issue 3 Pages
229-230
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1-
t-Butyldimethylsiloxy-8,11,11-trimethylbicyclo[5.3.1]undec-7-en-9-one (
2) has been synthesized via intramolecular aldol condensation of the precursor
3 by combined use of lithium diisopropylamide (LDA) and CeCl
3. The dicarbonyl compound
3 was prepared by allylation of 8-membered ring ketone
6b.
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Takuji Hirose, Bruce W. Baldwin, Tadafumi Uchimaru, Seiji Tsuzuki, Mas ...
1995 Volume 24 Issue 3 Pages
231-232
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N-Substituted-1,3,5-trimethylcyclohexane-3,5-imido-1-carboxylic acids efficiently transported Ca
II and Mg
II from alkaline earth metal ion mixtures against their concentration gradient through a chloroform liquid membrane.
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Kiyotaka Onitsuka, Toshiya Yoshida, Tomohiro Adachi, Toshikatsu Yoshid ...
1995 Volume 24 Issue 3 Pages
233-234
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The treatment of σ-ferrocenylplatinum complex with dimethyl or diethyl acetylenedicarboxylate results in the formal insertion of acetylene into the C-H bond at the 2-position of the ferrocenyl group to yield a racemic mixture of σ-(2-ethenyl)ferrocenylplatinum complex (
2). Characterization of complex
2 was performed by spectroscopic and X-ray diffraction analyses.
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Yukihiko Hashimoto, Kazuo Takaoki, Atsushi Sudo, Tsuneo Ogasawara, Kaz ...
1995 Volume 24 Issue 3 Pages
235-236
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The chiral imines prepared from an artificial chiral auxiliary,
erythro-2-amino-1,2-diphenylethanol, and various aldehydes, reacted with organolithium reagents to give the corresponding chiral amines with excellent diastereofacial selectivity.
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Nobuyuki Ichinose, Nobuo Shimo, Hiroshi Masuhara
1995 Volume 24 Issue 3 Pages
237-238
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3-Nitrophenoxycarbonyl group was introduced to a silylated glass surface with 3-mercaptopropyltrimethoxysilane (MPS) through the Michael addition of corresponding acrylic acid ester to the mercapto group of the MPS. The nature of this ester group, reactivity to amino group giving amide bond (activated ester) under dark and to water giving a corresponding carboxylic acid upon UV-irradiation, was utilized to prepare micropatterns of protein on the glass surface.
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Kazumasa Funabiki, Tetsuya Ohtsuki, Takashi Ishihara, Hiroki Yamanaka
1995 Volume 24 Issue 3 Pages
239-240
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1-Substituted-2,3,3-trifluoro-1-propenyl
p-toluenesulfonates, readily available by the alkylation or arylation of 2,3,3-trifluoro-1-tosyloxy-1-propenyllithium or -zinc reagent, reacted smoothly with amidine or hydrazine derivatives at 70 °C for 1 h to give the corresponding 5-fluoropyrimidine or 4-fluoropyrazole compounds, respectively, in moderate to excellent yields.
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Tisato Kajiyama, Yushi Oishi, Kazuaki Suehiro, Fuminobu Hirose, Taishi ...
1995 Volume 24 Issue 3 Pages
241-242
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Structural defect in lignoceric acid monolayer was investigated with an atomic force microscope(AFM). A molecular-resolution AFM image exhibited us the first direct observation of edge dislocation in the lignoceric acid monolayer.
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René Beugelmans, André Lechevallier, Tawfik Gharbaoui, T ...
1995 Volume 24 Issue 3 Pages
243
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N-Azolyl olefins undergo a cohalogenation reaction when treated by the NBS/ROH system to give novel N-(bromoalkoxypropane) azolyl derivatives.
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Masanobu Kurioka, Kazuyuki Nakata, Tetsuro Jintoku, Yuki Taniguchi, Ke ...
1995 Volume 24 Issue 3 Pages
244
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The Pd(OAc)
2/Cu(OAc)
2/O
2/CF
3COOH system has been found to catalyze the direct conversion of methane to acetic acid in the presence of CO. The reaction of methane with CO
2 also gave acetic acid in high yields.
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Kunio Mochida, Rieko Hata, Chikako Hodota, Shunichi Fukuzumi, Masahiro ...
1995 Volume 24 Issue 3 Pages
245
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In the presence of tetracyanoethylene (TCNE), Ge-Ge bonds of oligogermanes (Me(Me
2Ge)
nMe, n = 2-5) were cleaved with CCl
4 to yield the corresponding chlorogermanes. A mechanism involving an oligogermane radical cation is proposed for the Ge-Ge cleavage.
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Tamon Okano, Keiichi Miyamoto, Jitsuo Kiji
1995 Volume 24 Issue 3 Pages
246
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The transesterification of esters with alcohols was efficiently catalyzed by Ln(OPr
i)
3. The catalytic activity of Ln(OPr
i)
3 decreased in the following order; La > Nd > Gd > Yb, and was much higher than those of Al(OPr
i)
3 and Ti(OPr
i)
4.
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