-
Hideki Sugihara, Jean-Paul Collin, Kazuhisa Hiratani
1994 Volume 23 Issue 3 Pages
397-400
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Newly prepared oligomethylene-bridged bisphenanthrolines have been found to transport lithium ion with excellent selectivity among alkali metal ions through chloroform liquid membrane.
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Hitoshi Tamiaki, Shoichiro Takeuchi, Rikuhei Tanikaga, Silviu T. Balab ...
1994 Volume 23 Issue 3 Pages
401-402
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Visible absorption spectra of the
in-vitro oligomers of the 3
1-epimeric zinc methyl bacteriopheophorbides-
d are different in apolar organic solvents. This indicates structural differences between these oligomers which are controlled by the configuration of the 1-hydroxyethyl group at C-3.
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Eiichi Shouji, Shinji Nishimura, Kimihisa Yamamoto, Eishun Tsuchida
1994 Volume 23 Issue 3 Pages
403-406
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Solution viscosity of Poly(methyl 4-phenylthiophenylsulfonium trifluoromethanesulfonate) as a novel polycation was measured in aqueous acetonitrile solution and formic acid. In the presence of sodium trifluoromethanesulfonate as supporting electrolyte, K and α values are determined to be K = 7.46 × 10
−7 and α = 1.30 of Mark–Houwink equation in formic acid, in which the molecular weight of the poly(sulfonium cation) is estimated from that of poly(phenylene sulfide).
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Susumu Kuwabata, Kazufumi Nishida, Hiroshi Yoneyama
1994 Volume 23 Issue 3 Pages
407-410
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Electrochemical reduction of formaldehyde to methanol, acetaldehyde to ethanol, and acetone to 2-propanol has been achieved using either one of the two kinds of alcohol dehydrogenases, ADH(EC1.1.1.1) and ADH(EC1.1.1.2), as an electrocatalyst. ADH(EC1.1.1.1) was effective in reducing formaldehyde at a relatively high reaction rate, while ADH(EC1.1.1.2) worked well for the reduction of acetaldehyde and acetone. In all cases the current efficiency and the production yield attained to
ca. 100%.
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Yukihiro Yokoyama, Osamu Kikuchi, Terutake Koizumi, Kensuke Takahashi
1994 Volume 23 Issue 3 Pages
411-414
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The
1H,
7Li and
13C NMR spectra have been observed for the dilithium salt of 1,2-bis(2-pyridyl)ethylene in solution. The dianion in solution exists only one species with fixed s-
cis-(
Z,Z) configuration in contrast to stilbene dianion.
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Yasuo Yamamoto, Hideki Katow, Shosuke Sofuku
1994 Volume 23 Issue 3 Pages
415-418
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The Arg-Gly-Asp (RGD) sequence is an active site in the cell-binding domain of fibronectin. Ala-analogs of RGDSPASS containing cystine peptide (FR-1) were synthesized to investigate the relationship between the functional group and the biological activity of FR-1.
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Yoshinobu Inouye, Yumi Sugo, Takenori Kusumi, Nobuhiro Fusetani
1994 Volume 23 Issue 3 Pages
419-420
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Bisconicasterone was isolated from the marine sponge
Theonella swinhoei, and its structure was established by spectroscopic analysis as well as chemical correlation with its monomeric component, conicasterone, the absolute stereochemistry of which was confirmed by modified Mosher’s method, chemical conversion, and by X ray crystallography.
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Haruo Nishida, Yutaka Tokiwa
1994 Volume 23 Issue 3 Pages
421-422
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Ecological biodegradability of aliphatic polycarbonates in different environments was estimated by the clear-zone method with an agar medium containing emulsified polycarbonates. It was found that poly(1,3-dioxolan-2-one) can be degraded by microorganisms in certain limited environments.
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Hiroshi Uyama, Hideharu Kurioka, Isao Kaneko, Shiro Kobayashi
1994 Volume 23 Issue 3 Pages
423-426
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Enzymatic oxidative polymerization of phenol has been performed in an aqueous organic solvent using horseradish peroxidase as catalyst to produce a new family of phenol resin. The resulting polymer was partly soluble in DMF and DMSO and the fraction soluble in DMF has molecular weight of 3.5 × 10
4. From IR and
1H NMR analyses, the polymer structure was found to be composed of a mixture of phenylene and oxyphenylene units.
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Mineo Sato, Shigeru Kano
1994 Volume 23 Issue 3 Pages
427-430
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A new compound of LiMnVO
4 has been synthesized. The crystal structure was determined by the Rietveld analysis. The framework structure is comprised of nearly regular octahedra of MnO
6 with edge-sharing. The lithium and vanadium ions occupy alternatively the tetrahedral interstitial sites constructed by close-packing arrays of oxide ions. The structure is discussed in relation to a normal spinel structure.
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Shin-ichi Nakagawa, Satoru Murata, Tetsuo Sakai, Masakatsu Nomura
1994 Volume 23 Issue 3 Pages
431-432
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Hydrogenation of biphenyl with the activated hydrogen storage alloy, MmNi
3.5Co
0.7Al
0.8H
4 (Mm: La, 30; Ce, 52; Pr, 5; Nd, 13 wt%), as a stoichiometric reductant proceeded effectively at 160 °C for 3 h under nitrogen to give either phenylcyclohexane or bicyclohexyl selectively, according to the ratio of the alloy to biphenyl.
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Naoyuki Shimomura, Masahiro Saitoh, Teruaki Mukaiyama
1994 Volume 23 Issue 3 Pages
433-436
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Catalytic synthesis of several
D-ribofuranosides from 2,3,5-tri-O-benzyl-1-O-iodoacetyl-
D-ribofuranose and trimethylsilylated nucleophiles such as 3β-cholestanyl trimethylsilyl ether and phenyl trimethylsilyl sulfide is efficiently promoted by tin(II) chloride under mild conditions. When allyltrimethylsilane, azidotrimethylsilane, etc., are used as nucleophiles, combined use of catalytic amounts of SnCl
2 and SiCl
4 also afforded the corresponding ribofuranosides in good yields.
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Makoto Hojo, Hajime Harada, Akira Hosomi
1994 Volume 23 Issue 3 Pages
437-440
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Ketene dithioacetals bearing an alkoxycarbonyl group at 2-position are effectively reduced by two equimolar amounts of dimethylcuprate derived from methyllithium and cuprous cyanide to yield the corresponding functionalized vinylcopper species. These organocopper species are efficiently trapped by carbon electrophiles. Formal substitution reactions of a methylthio group in ketene dithioacetals by electrophiles can be attained by one-pot operation. Synthesis of β-thiobutenolides was also achieved.
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Tadashi Tokii, Kouji Ide, Michio Nakashima, Masayuki Koikawa
1994 Volume 23 Issue 3 Pages
441-444
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Novel hexanuclear iron(III) complexes with Fe
2(μ-OH)(μ-RCOO)
2 moiety in the molecule (where RCOO is an amphoteric ion of β-alanine (
1) or glycylglycine) have been prepared. The crystal structure of
1 consists of two μ-hydroxo-bis(μ-β-alanine-
O,
O′)diiron(III) cores and two iron(III) ions bridged by μ-oxo ions at each iron(III) site in the cores.
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Shoko Yokoyama, Masaaki Sunohara, Tadao Fujie, Makoto Hasegawa, Masahi ...
1994 Volume 23 Issue 3 Pages
445-448
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A thermo-sensitive fatty acid-drug crystalline complex was prepared. The mechanism for the thermo-sensitivity was investigated by the powder X-ray diffractometry and the infrared spectroscopy, and its applicability to a thermo-responsive drug delivery system was discussed.
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Kazuhiko Mizuno, Hikaru Sugita, Tadashi Kamada, Yoshio Otsuji
1994 Volume 23 Issue 3 Pages
449-452
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1-Alkenyl-2-(2′,2′-diphenylethenylidene)cyclopropanes thermally rearranged to 4-(diphenylethenylidene)cyclopent-1-enes at relatively low temperature (≤373 K). Measurement of activation parameters revealed that the reactivity and mode of the reaction largely depend on structures of starting materials and products.
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Masahide Yasuda, Tatsuya Sone, Kimiko Tanabe, Kensuke Shima
1994 Volume 23 Issue 3 Pages
453-456
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Irradiation of
o-alkenylphenols with alkylamines resulted in Markovnikov-type amination to give
o-(1-alkylaminoalkyl)phenols in relatively good yields. The photoamination was initiated by a proton transfer from the ammonium ion to the alkenyl group of
o-alkenylphenolate anion in the excited state in the ion pair formed between the phenols and the amines. The resulting zwitter ion allowed the nucleophilic addition of the amine at the benzylic cation center.
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Kenshu Fujiwara, Hiromi Sakai, Toshiyuki Tanaka, Masahiro Hirama
1994 Volume 23 Issue 3 Pages
457-460
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Cross-conjugated 5-methylene-3-heptene-1,6-diyne derivatives have been proved to be readily epoxidized by molecular oxygen.
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Hideki Etori, Takaki Kanbara, Takakazu Yamamoto
1994 Volume 23 Issue 3 Pages
461-464
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New π-conjugated polymers having quinone units as the recurring units, e.g., poly(2-methyl-9,10-anthraquinone-1,4-diyl) P(Me-1,4-AQ) with molecular weight of 56000, have been prepared by dehalogenation polycondensation of dichloroquinones. P(Me-1,4-AQ) exhibits unique redox behaviors due to electronic interactions between the multiple redox centers in the polymer through the π-conjugated system.
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Ichiro Takahashi, Osamu Muramatsu, Jun Fukuhara, Yoshinao Hosokawa, Na ...
1994 Volume 23 Issue 3 Pages
465-468
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Title compounds possessing a variety of substituents are systematically prepared by means of Meerwein arylation of benzene-1,4-dione. Synthetic aspects and their MNDO calculation-based interpretation are described.
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Hiromasa Yamamoto, Toru Sakaki, Seiji Shinkai
1994 Volume 23 Issue 3 Pages
469-472
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The product distribution in the synthesis of calix[4]crowns from calix[4]arene-25,26,27,28-tetrol and 3,6-dioxaoctane-1,8-ditosylate was investigated in detail. It was shown that the 1,2- vs. 1,3-bridging regioselectivity is governed by the basicity and the metal cation of the used base. The findings enable us to regioselectively synthesize desired calix[4]crowns in good yields, which has been believed to be too difficult to control.
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Masatsugu Kajitani, Naoki Hisamatsu, Masahiro Takehara, Yoshiko Mori, ...
1994 Volume 23 Issue 3 Pages
473-476
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(η
5-Cyclopentadienyl or η
5-pentamethylcyclopentadienyl)(1-phenylmethanimine-
N,1-dithiolato)cobalt(III) (
1) reacts with dimethyl acetylenedicarboxylate (DMAD) to give the adducts in which Co and S of the 1,2,5,3-cobaltadithiazole ring in the cobalt complex are bridged by 1,2-dimethoxycarbonylethylene-1,2-diyl groups (
3a: the complex having Cp and
3b: the complex having Cp*). The sulfur atom adjacent to N is preferentially reacted. Photolysis of
3 gives 3,4-dimethoxycarbonyl-1,2,5-cobaltadithiolene (
4) with the elimination of benzonitrile. In thermolysis in benzene,
3a undergoes selectively the elimination of benzonitrile to give
4a, while
3b undergoes the elimination of either DMAD or benzonitrile to give
1 or
4.
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Shunji Ito, Noboru Morita, Toyonobu Asao
1994 Volume 23 Issue 3 Pages
477-480
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Dynamic stereochemistry of di(3-methyl-1-azulenyl)phenylmethyl hexafluorophosphate (
5) was studied by temperature dependent
1H NMR spectra. The low temperature NMR indicated that the compound (
5) exists in three propeller conformations (C
1 and two C
2 symmetry), and at higher temperature the spectra reflect rapid isomerization, which were interpreted by the flip mechanism of one azulene ring. The processes have activation energies of 53.8 and 45.2 kJ mol
−1.
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Masayasu Iida, Yuri Mizuno, Norio Koine
1994 Volume 23 Issue 3 Pages
481-484
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Chiral discrimination of [Co(en)
3]
3+ was investigated by using
59Co NMR spectroscopy in liquid crystals comprising cesium N-dodecanoyl-
L-(or
D)-alaninate. The
59Co quadrupole splitting was distinguishable by diastereomeric interactions while a change in the chemical shift was the same.
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Takashi Hibino, Koichi Asano, Hiroyasu Iwahara
1994 Volume 23 Issue 3 Pages
485-488
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The CAPCIUS cell was improved using SrCe
0.95Yb
0.05O
3−α as a solid electrolyte. When the operating temperature was 950 °C and the thickness of SrCe
0.95Yb
0.05O
3−α ceramic was 0.5 mm, the maximum power density was 21 mW cm
−2, which was about 10 times value observed in the CAPCIUS cell using YSZ with the same thickness as a solid electrolyte. The mechanism for the improvement was studied by various electrochemical techniques.
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Tsugio Murakami, Susumu Tsuchiya
1994 Volume 23 Issue 3 Pages
489-490
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The equation, dl
a/dt = k C
s exp (−b l
a), newly proposed can well express the rate of crystal growth in the second step of two-step crystallization of calcium hypochlorite dihydrate.
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Masahiro Miyazawa, Keiji Yamamoto
1994 Volume 23 Issue 3 Pages
491-494
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Competition experiments in the palladium-catalyzed aminocarbonylation of cinnamyl
N,
N-dialkylcarbamates with
p-methylcinnamylamines revealed that the allylamine did not undergo oxidative addition but attacked extensively a π-allylpalladium which arose from the allyl carbamate under the conditions employed, forming a mixture of the corresponding amides containing either cinnamyl moiety that incorporates a dialkylamino component
originated only from the carbamate.
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Kiyoshi Otsuka, Toshikazu Yagi, Ichiro Yamanaka
1994 Volume 23 Issue 3 Pages
495-498
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Electrolytic carbonylation of methanol has been attempted in the gas phase under atmospheric pressure at 343 K. The graphites added with PdCl
2 and CuCl
2 are favorable anodes for the synthesis of dimethyl carbonate (DMC). The formation of DMC occurs at a lower applied voltage than that for dimethoxy methane and methyl formate. However, a considerable CO
2 formation accompanies the DMC formation.
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Koichiro Fukuoka, Fuminori Suda, Ryo Suzuki, Masahide Ishikawa, Tsujia ...
1994 Volume 23 Issue 3 Pages
499-502
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S,
S′-Bis(4-chlorophenyl) phosphorodithioate was useful for the synthesis of α,γ-dinucleoside 5′-triphosphates, G
5′pppG and A
5′pppA starting from the corresponding unprotected nucleoside 5′-phosphates under neutral conditions. G
5′pppG was used for the synthesis of m
7G
5′pppG by means of the N
7-methylation of one of two guanine moieties of G
5′pppG.
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Katsuyuki Hirai, Kazunori Komatsu, Hideo Tomioka
1994 Volume 23 Issue 3 Pages
503-506
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The title carbene generated by photolysis of the corresponding diazo compound at room temperature gave 4,6-di-
tert-butyl-1,1-dimethyl-3-phenylindan quantitatively. Triplet states of the carbene were observed by laser flash photolysis of the diazo compound in the presence of benzophenone as a triplet sensitizer.
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Satoshi Ogawa, Naoki Yomoji, Shin-ichi Chida, Ryu Sato
1994 Volume 23 Issue 3 Pages
507-510
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Sterically crowded benzotrithioles were efficiently and selectively prepared by the reduction of corresponding benzotrithiole 2-oxides which were readily obtained on treatment of benzodithiastannoles, synthetic equivalents of benzenedithiols, with thionyl chloride.
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Wataru Fujita, Norio Teramae, Hiroki Haraguchi
1994 Volume 23 Issue 3 Pages
511-514
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Thiophene adsorbed on a roughened gold electrode was studied in an aqueous solution at various potentials from 0 to 1.0 V vs. SCE by use of surface enhanced Raman scattering. It was found that thiophene oligomers and polythiophene were produced on the electrode surface at potential ranges of 0–0.6 V and 0.8–1.0 V, respectively. This potential range is significantly low compared to the potential used in the conventional electropolymerization of thiophene monomer (1.6 V vs. Ag/AgCl) in acetonitrile medium.
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Isamu Shiina, So Miyoshi, Mitsutomo Miyashita, Teruaki Mukaiyama
1994 Volume 23 Issue 3 Pages
515-518
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Various carboxylic esters are prepared in excellent yields from nearly equimolar amounts of free carboxylic acids and alcohols at room temperature by combined use of 4-(trifluoromethyl)benzoic anhydride and a catalytic amount of active titanium(IV) salt together with chlorotrimethylsilane.
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Tetsuo Saji, Kazuki Uehara, Kazuhiro Sugawara, Shunlin Liu
1994 Volume 23 Issue 3 Pages
519-522
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A dye thin film was prepared on an indium tin oxide (ITO) electrode by controlled potential electrolysis (oxidation) of 1,4-benzenediamine derivative (
1) following reaction with a coupler. Photoelectrochemical oxidation of
1 with TiO
2 particle in the presence of methyl viologen (MV
2+) also gave a dye film and a photo image.
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Akira Shimoyama, Ryusuke Shigematsu
1994 Volume 23 Issue 3 Pages
523-526
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Dicarboxylic acids were recovered in the C
2 to C
9 range in concentration about 2000 to 0.1 nmol/g from the Murchison and Yamato-791198 carbonaceous chondrites. The molecular distributions of the saturated straight-chain acids suggest that they approximately show their original compositions when they were formed in the early solar system. Optical isomers of the acids were found to be racemic.
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Kiyomi Imagawa, Takushi Nagata, Tohru Yamada, Teruaki Mukaiyama
1994 Volume 23 Issue 3 Pages
527-530
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N-Alkyl imidazoles are effective axial ligands to achieve highly enantioselective epoxidation of unfunctionalized olefins by combined use of molecular oxygen and pivalaldehyde with optically active Mn(III)-salen-type complex catalysts. In the presence of
N-alkyl imidazole, the epoxidation of 2,2-dimethylchromene proceeded smoothly to afford the corresponding optically active epoxide in 92% enantiomeric excess.
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Shun-ya Onozawa, Toshiyasu Sakakura, Masato Tanaka
1994 Volume 23 Issue 3 Pages
531-534
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A wide variety of aldehydes are efficiently dimerized to esters by a catalytic amount of (C
5Me
5)
2LnCH(SiMe
3)
2 (Ln = Nd, La). The reaction is applicable to the synthesis of polyesters from dialdehydes. A stoichiometric reaction of the lanthanum complex with benzaldehyde indicates the intermediacy of alkoxo complexes in the catalysis.
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Eiichiro Hata, Toshihiro Takai, Tohru Yamada, Teruaki Mukaiyama
1994 Volume 23 Issue 3 Pages
535-538
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In the presence of a catalytic amount of nickel(II) complex, various α-alkoxy cyclic ketones are smoothly oxygenated into acetal lactones by combined use of molecular oxygen and aldehydes at room temperature under an atmospheric pressure. Successive treatment of formed acetal lactones with hydrogen chloride in alcohols affords the corresponding acetal carboxylic acids in good to quantitative yields.
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Tetsuto Tsunoda, Junko Otsuka, Yoshiko Yamamiya, Shô Itô
1994 Volume 23 Issue 3 Pages
539-542
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N,
N,
N′,
N′-Tetramethylazodicarboxamide, TMAD, was found to be more versatile in the Mitsunobu reaction than traditional diethyl azodicarboxylate or recently developed 1,1′-(azodicarbonyl)dipiperidine, when used in combination with tributylphosphine in benzene. The usefulness of the reagent was demonstrated by the highly efficient two-step synthesis of benzylcrotylamine from
N-benzyltrifluoroacetamide.
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Tetsuto Tsunoda, Shinji Tatsuki, Kazuko Kataoka, Shô Itô
1994 Volume 23 Issue 3 Pages
543-546
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(−)-Isoiridomyrmecin was synthesized stereoselectively in 6 steps starting from 1-hydroxymethyl-5-methylcyclopentene and utilizing tlle asymmetric aza-Claisen rearrangement as a key step.
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Anna Palka, Leszek Czuchajowski
1994 Volume 23 Issue 3 Pages
547-550
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New porphyrins containing aziridinyl-p-benzoquinone meso-substituents were synthesized. They were designed to be specific DNA cross-linkers and alkylating agents.
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Ivan Grozdanov
1994 Volume 23 Issue 3 Pages
551-554
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A simple, inexpensive and pollution free electroless chemical deposition technique was used to deposit thin coatings of inorganic electrically conductive materials (Cu
xS, x∼2, CuS and Cu
2Se), microwave shielding materials (CuS and Cu
2Se) and IR-detecting materials (PbS and PbSe) on transparent polyester films. The technique is based on hydrolytic decomposition of thiosulfate and selenosulfate complexes of the corresponding metals in aqueous media.
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Masahiro Kishida, Keiki Yamada, Hideo Nagata, Katsuhiko Wakabayashi
1994 Volume 23 Issue 3 Pages
555-556
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CO
2 hydrogenation over silica-supported catalysts was carried out to investigate the synthesis of C
2+ alcohols (ethanol, propanol and butanol). The Ir-Mo bimetallic system among the catalysts investigated was found to produce C
2+ alcohols. The catalytic performance of the Ir-Mo catalysts was examined as a function of Mo/Ir molar ratio. It was revealed that the highest selectivity to C
2+ alcohols was obtained in the Mo/Ir ratios of around 0.3.
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Yotaro Morishima, Junko Fujita, Takahiro Ikeda, Mikiharu Kamachi
1994 Volume 23 Issue 3 Pages
557-560
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A mesogenic acrylate monomer 4-(2,2,6,6-tetramethylpiperidyl-4-oxy)phenyl 4′-(6-acryloyloxyhexyl)benzoate was synthesized and copolymerized with 4-cyclohexyloxyphenyl 4′-(6-acryloyloxyhexyloxy)benzoate. Oxidation of the copolymer yielded a nitroxide-containing liquid-crystalline side-chain polymer.
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Takayuki Ishida, Kenjiro Tanaka, Takashi Nogami
1994 Volume 23 Issue 3 Pages
561-562
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A fullerene urethane, C
60NCO
2CH
2CH
3, was obtained by a one-pot reaction from C
60, NaN
3, ClCO
2CH
2CH
3, and 15-crown-5 ether in refluxing toluene. The structure of the product was spectroscopically determined as a closed aziridine at a 6/6-ring junction.
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Kiwamu Yamaoka, Ryo Sasai, Natsuki Ikuta
1994 Volume 23 Issue 3 Pages
563-566
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Reversing-pulse electric birefringence of montmorillonite was measured in aqueous media at 25 °C and at 633 nm. The counterion for this clay was either Na
+ or Mg
2+. The electric field orientation of the disk-shaped particle was due to ion-induced dipole moments but not due to permanent dipole moment.
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Tsuyoshi Satoh, Norifumi Itoh, Shizue Watanabe, Haruko Matsuno, Koji Y ...
1994 Volume 23 Issue 3 Pages
567-570
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α-Sulfinyl ketones were prepared by the reaction of alkyl phenyl sulfoxide or chloromethyl
p-tolyl sulfoxide with aldehydes or methyl esters in high yields, and were converted to acetylenes through β-trifluoromethanesulfonyloxy vinyl sulfoxides by the ligand exchange reaction of the sulfinyl group.
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Limin Chen, Yoshihiro Makide, Takeshi Tominaga
1994 Volume 23 Issue 3 Pages
571-574
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Atmospheric concentration of 1,2-dichlorotetrafluoroethane (CFC-114) was determined accurately by the complete separation of its isomer 1,1-dichlorotetrafluoroethane (CFC-114a). The trends of atmospheric CFC-114 concentrations since 1986 were observed in Hokkaido, Japan (40–45 °N), and Syowa Station, Antarctica (69 °S). The atmospheric CFC-114 concentration in the mid-latitude Northern Hemisphere increased by 0.75 pptv / year over the period 1986–1990, and 0.6 pptv / year over 1990–1993. Vertical distribution of CFC-114 was also obtained up to mid-stratosphere.
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Itaru Hamachi, Yusuke Tajiri, Hiroto Murakami, Seiji Shinkai
1994 Volume 23 Issue 3 Pages
575-578
Published: 1994
Released on J-STAGE: April 14, 2006
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A semi-artificial myoglobin (Mb) with phenylboronic acid pendant groups was synthesized by the cofactor reconstitution method in the presence of sugars. A sugar with higher affinity for phenylboronic acids more efficiently facilitated the Mb reconstitution from a heme bearing two phenylboronic acid groups.
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Eiji Yashima, Makiko Yamada, Yoshio Okamoto
1994 Volume 23 Issue 3 Pages
579-582
Published: 1994
Released on J-STAGE: April 14, 2006
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Chiral discrimination of enantiomers by cellulose tris(4-trimethylsilylphenylcarbamate) (CTSP) was studied by
1H NMR spectroscopy. The
1H NMR signals of
trans-stilbene oxide and 2-butanol were enantiomerically separated into two sets of peaks in the presence of CTSP in CDCl
3. The competition experiment with acetone suggests that
trans-stilbene oxide may be adsorbed on the NH proton of carbamate residues of CTSP. Chemical shift non-equivalence in enantiotopic methyl groups of 2-propanol was observed in the presence of CTSP.
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