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Volume 25, Issue 3
Displaying 1-34 of 34 articles from this issue
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Weon Seok Oh, Myung Hee Kwon, Su Yeon Kim, Kyoung Tai No, Suk-Kyu Chan ...1996 Volume 25 Issue 3 Pages 181-182
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSThe molecular dynamics simulations of the template effects of alkali metal cations for the synthesis of monobenzo-15-crown-5 were performed. The simulation results qualitatively duplicate the experimental results and Na+ ion was found to be the best template ion among alkali metal cations.View full abstract -
Kazuaki Ito, Yoshihiro Ohba, Tyo Sone1996 Volume 25 Issue 3 Pages 183-184
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSChiral calixarene analogs incorporating aminoethanethiol unit such as L-cysteine alkyl ester into their rings were prepared. NMR studies of the macrocycles reveal that their preferred conformations in solution are a cone form and the introduction of aminoethanethiol unit in their rings causes the ring fluctuation.View full abstract -
Masahiro Murakami, Hajime Ito, Yoshihiko lto1996 Volume 25 Issue 3 Pages 185-186
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSPreparation of a 13C-labeled isocyanide and its application to the total synthesis of [2-13C]D-ribo-C18-phytosphingosine are described. The synthesis of the labeled phytosphingosine is based on the use of the isocyanide as a 13CH–NH2 precursor in the SmI2-mediated three-component coupling reaction, wherein regio- and stereoselective incorporation of a 13C nuclide in the carbon skeleton is achieved.View full abstract -
Hisakazu Mihara, Kin-ya Tomizaki, Tsutomu Fujimoto, Seiji Sakamoto, Ha ...1996 Volume 25 Issue 3 Pages 187-188
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSAn artificial membrane protein bearing a flavin and a porphyrin functionalities was designed and synthesized. The protein took a 4α-helix structure and exhibited an electron transfer function in a bilayer membrane.View full abstract -
Tohru Nakamura, Reiko Azumi, Hiroaki Tachibana, Mutsuyoshi Matsumoto1996 Volume 25 Issue 3 Pages 189-190
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSExternal electric field effects on the electronic structures of charge transfer salts were examined for the first time in Langmuir-Blodgett films. Significant electroabsorption signals arising primarily from the first Stark effect were obtained for the films of amphiphilic tetrathiafulvalene derivatives / 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane 1 : 1 salts.View full abstract -
Shouhei Nozawa, Toru Sugiyama, Masatsugu Kajitani, Takeo Akiyama, Akir ...1996 Volume 25 Issue 3 Pages 191-192
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSThe reaction of [Rh(Cp*)(CO)2] (1) with 5-phenyl-3H-1,2-dithiol-3-one (2) affords two rhodiadithiolene complexes, a dimer of (η5-pentamethylcyclopentadienyl)(1-oxo-2-benzylidene-1,2-ethanedithiolato)rhodium(III) (4) and (η5-pentamethyl cyclopentadienyl)(1-phenyl-1,2-ethenedithiolato)rhodium(III) (5). 5-Phenyl-3H-1,2-dithiole-3-thione (3) reacts with 1 to afford only 5. The formation of the complexes 4 and 5 is explained by a mechanism via the attack of coordinatively unsaturated “Rh(Cp*)(CO)” species to the S atom of 2, followed by rearrangement.View full abstract -
Hiroaki Okamura, Yasuko Nakamura, Tetsuo Iwagawa, Munehiro Nakatani1996 Volume 25 Issue 3 Pages 193-194
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSAn asymmetric base-catalyzed Diels-Alder reaction of 3-hydroxy-2-pyrone with N-methylmaleimide was achieved by using cinchona alkaloids as asymmetric catalysts. The reaction catalyzed by cinchonidine afforded endo-adduct in 77% ee, and opposite enantiomer of 71% ee was obtained with cinchonine.View full abstract -
Takayasu Kawasaki, Yuji Fujioka, Koji Saito, Hiromichi Ohta1996 Volume 25 Issue 3 Pages 195-196
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSFT-IR measurement disclosed a formation of a thiol ester bond between a cysteine of arylmalonate decarboxylase and an active site directed inhibitor, α-bromophenylacetate, strongly suggesting that the enzyme initially activates the substrates in a similar mechanism.View full abstract -
Yasuyuki Katagiri, Natsuji Sawaki, Yukiko Arai, Hiroshi Okochi, Manabu ...1996 Volume 25 Issue 3 Pages 197-198
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSHydroxymethanesulfonate ion (HMSA) is an important species in dewwater and the formation of HMSA enhances the dissolution of SO2. The HMSA stability constant calculated from the measured concentrations of free formaldehyde and S(IV) in dewwater agreed in the order with the reported value, which suggested the formation of HMSA and other S(IV) complexes.View full abstract -
Hiroshi Imahori, Yoshiteru Sakata1996 Volume 25 Issue 3 Pages 199-200
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSA porphyrin-linked fullerene where a C60 moiety is covalently linked to the meso position of 5,15-diarylporphyrin with a pyrolidine spacer was prepared. 1H NMR, electronic absorption, and electrochemical studies show that there is a considerable interaction between the two chromophores.View full abstract -
Makoto Handa, Yasuyoshi Sayama, Masahiro Mikuriya, Ryoji Nukada, Ichir ...1996 Volume 25 Issue 3 Pages 201-202
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSA chain complex of ruthenium(II,III) cation dimer linked by the nitroxide radical, [Ru2(O2CCMe3)4(NITPh)]n(BF4)n (NITPh = 2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy-3-oxide) has been prepared and characterized. The structure with the alternated alignment of S = 3/2 (Ru(II,III) core) and S = 1/2 (NITPh) has been confirmed by the X-ray crystal analysis. The magnetic moment decreases monotonously with decrease of temperature.View full abstract -
Makoto Sato, Hajime Yoshimura, Hideki Obi, Shin-ichi Hatakeyama, Emiko ...1996 Volume 25 Issue 3 Pages 203-204
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSA highly sensitive and selective fluorometric method for aluminium in humn serum with 8-quinolinol has been developed by the use of kinetic differentiation mode micellar high performance liquid chromatography. The most remarkable point of this method is that only aluminium ion responses to this detection system, as well as no deproteinization is required prior to analysis. The detection limit, 3SD, was 1 ppb for aluminium.View full abstract -
Li Chen, Shunsuke Izumi, Diana I. Ito, Tomoko Iwaeda, Ryoichi Utsumi, ...1996 Volume 25 Issue 3 Pages 205-206
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESS4[2-(3-Hydroxyphenyl)ethyl]phenol and 4-hydroxy-2,3-dimethyl-2-nonen-4-olide were isolated from the medium of Marchantia polymorpha cell cultures as allelopathic substances.View full abstract -
Tamiko Takahashi, Naoki Nakao, Toru Koizumi1996 Volume 25 Issue 3 Pages 207-208
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSEnantioselective protonation of a simple enolate has been developed using an optically pure γ-hydroxyselenoxide 1 as a chiral proton source. Reaction of zinc bromide enolate 7b with (SSe)-selenoxide (SSe)-1c gave (S)-2-benzylcyclohexanone (S)-8 with high enantioselectivity. Intramolecular hydrogen bonding between hydroxy group and seleninyl-oxygen of 1 would contribute to this asymmetric induction.View full abstract -
Guiscard Glück, Helmut Ringsdorf, Yukihisa Okumura, Junzo Sunamot ...1996 Volume 25 Issue 3 Pages 209-210
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSLaser scanning confocal microscopy was applied to collect vertical fluorescence intensity profiles of fluorescent supramolecular assemblies at the air/water interface. For monolayers, fluorescence was collected in the range of a couple of tens of micrometers according to the theoretical thickness of optical section. This technique provides an in situ possibility to monitor supramolecular assemblies and assembling at the air/water interface even without resolving in molecular dimensions.View full abstract -
Srivari Chandrasekhar, Suchismita Mohapatra, Samala Lakshman1996 Volume 25 Issue 3 Pages 211-212
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSExposure of tosylhydrazones of α-oxy carbonyl compounds obtainable from carbohydrates and tartaric acid furnishes exocylic vinylic ethers.View full abstract -
Takayuki Kawashima, Naoko Yamashita, Renji Okazaki1996 Volume 25 Issue 3 Pages 213-214
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSerythro- and threo-β-Amino boranes Mes2BCHMeCHPhNHPh were synthesized by the reaction of Mes2BCHMeLi with N-benzylideneaniline. The stereochemistry was determined by chemical derivation into the corresponding cycic carbanates via β-amino alcohols. Their thermolysis gave a mixture of the corresponding (E)-enamine and its tautomer, (E)-imine, in sharp contrast to that of β-hydroxy boranes giving the olefins.View full abstract -
Ken Usami, Minoru Isobe1996 Volume 25 Issue 3 Pages 215-216
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSChemiluminescent characters of 2-hydroperoxide 2 and 1,2-dioxetanone 6 of coelenterate luciferin analog 1 prepared by low-temperature photooxygenation are described. Direct luminescence by thermal decomposition of 2 or 6 was independently observed, suggesting that the former emitted light as anionic amide 4, on the other hand, the latter as neutral one 7.View full abstract -
Kazushi Kinbara, Hiroshi Takezaki, Akiyoshi Kai, Kazuhiko Saigo1996 Volume 25 Issue 3 Pages 217-218
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSAlkyl nitrites selectively afforded the corresponding ketones upon photoirradiation in the solid state. It was suggested by the X-ray crystallographic analysis that the cavity in crystal and the initial conformation of the nitroso group had an influence on the yield of the ketones.View full abstract -
Akio Katsuki, Shin-ichi Watanabe, Ryoko Tokunaga, Yoshifumi Tanimoto1996 Volume 25 Issue 3 Pages 219-220
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSDeposition of silver was observed under a high gradient magnetic field. When a copper wire was placed on a piece of filter paper which was wet with silver nitrate aqueous solution (0.5 mol dm−3), the deposition of silver grew uniformly around the wire at zero field. In the presence of the magnetic field (Bmax = 8 T), the area of the deposition at the center of the magnetic field decreased. Diffusion of ions generated in the reaction seems to be affected by the high gradient field.View full abstract -
Mariko Adachi, Frédéric Lefebvre, Jean-Marie Basset1996 Volume 25 Issue 3 Pages 221-222
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSA new grafting method of organotin complexes with the surface of highly dehydroxylated silica is reported. Characterisation was achieved by surface microanalysis, in situ IR, solid state 13C CP-MAS and 119Sn MAS NMR. Bu3Sn-O-SnBu3 reacts with the strained siloxanes and opens these bridges at room temperature. The reaction occurs also with the remaining hydroxyl groups and with less strained siloxane bridges, leading in all cases to the same surface organometallic fragment ≡Si-O-SnBu3.View full abstract -
Isamu Shiina, Masahiro Saitoh, Koji Nishimura, Katsuyuki Saitoh, Terua ...1996 Volume 25 Issue 3 Pages 223-224
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESS7β,13α-Bistriethylsiloxy-1β,2α,10β-trihydroxy-9-oxo-4(20),11-taxadiene (2), derived from 10-deacetylbaccatin III via degradation of oxetane ring, was conveniently converted into 7-triethylsilylbaccatin III (1) by way of a new and effective method for constructing oxetane ring. Thus, the synthesis of a precursor of taxol from novel taxoid 2 was accomplished.View full abstract -
Junzo Otera, Kazuko Kawada, Toru Yano1996 Volume 25 Issue 3 Pages 225-226
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESS1,3-Disubstituted tetrabutyldistannoxanes effectively catalyze direct condensation polymerization of water-containing L-lactic acid to afford a high-molecular-weight polymer.View full abstract -
Hiroshi Uetsuka, Koji Watanabe, Hisashi Ohnuma, Kimio Kunimori1996 Volume 25 Issue 3 Pages 227-228
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSThe infrared chemiluminescence technique has been applied to the catalytic oxidation of CO on Pd(111), Pd(110) and polycrystalline Pd surfaces. The product CO2 molecules were vibrationally and rotationally excited in all cases. However, the vibrational energy states of CO2 were different among these three surfaces. This result means that the structure of the activated CO2 complex (i.e., the dynamics of CO oxidation) depends on the surface structures. In addition, the steady-state reaction rates of CO oxidation as a function of surface temperature were also different among the Pd surfaces. These results show that the CO oxidation on Pd is structure-sensitive not only in the kinetics but also in the dynamics.View full abstract -
Masahiko Tsuchiya, Yaming Li, Jingo Shirasaka, Takeo Kaneko1996 Volume 25 Issue 3 Pages 229-230
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSBy controlling the flow rate of a sample solution, information about clusters existing at the liquid surface were obtained by liquid ionization (LI) mass spectrometry. The relative abundances of binary cluster ions, (C2H5OH)m(H2O)nH+, with large m and n increased with the flow rate, while the abundances of ethanol cluster ions, (C2H5OH)mH+, increased by decreasing the flow rate. Molar ratios of water to ethanol observed were much higher than those observed by other methods.View full abstract -
Masao Chino, Guang Hao Liang, Takashi Matsumoto, Keisuke Suzuki1996 Volume 25 Issue 3 Pages 231-232
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSHydrozirconation of allenyl sulfide generates a γ-thio-allylzirconocene species, which reacts with aldehydes and ketones to give anti olefinic β-sulfenyl alcohols in highly regio- and stereoselective manner.View full abstract -
Takeshi Sugai, Yoshikazu Ohtsuka, Hiromichi Ohta1996 Volume 25 Issue 3 Pages 233-234
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSPreparation of (R)-4-(phenylthio)-2-butanol and (R)-4-(phenylsulfonyl)-2-butanol has been established based on the sequential use of two biocatalysts. A Pichia farinosa IAM 4682 mediated reduction of 4-(phenylthio)-2-butanone afforded (R)-4-(phenylthio)-2-butanol (91%e.e.) in 90% yield. Contaminating (S)-enantiomer in the resulting product was selectively oxidized by Rhodococcus rhodochrous IFO15564 to leave pure (R)-enantiomer in 87% yield. From this product, highly enantiomerically pure (R)-4-(phenylsulfonyl)-2-butanol was obtained by hydrogen peroxide oxidation.View full abstract -
R. Dhamodharan1996 Volume 25 Issue 3 Pages 235-236
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSA block copolymer, poly (styrene-block-4-vinylpyridine) is used as an additional poisoning agent in combination with Lindlar’s catalyst to drastically affect the selectivity in the semi-hydrogenation of phenylacetylene. Selectivity is demonstrated from gas chromatography data. The extra advantage in terms of preparing poisoning agent free, very pure and dry monomer are illustrated.View full abstract -
Tamio Kamidate, Toshikazu Kinkou, Hiroto Watanabe1996 Volume 25 Issue 3 Pages 237-238
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSDiethylaminoethyl (DEAE) - Dextran (Dx) enhanced the intensity of bioluminescence from firefly luciferase-luciferin reaction with adenosine-5′-triphosphate (ATP). The detection limit for ATP was 5 × 10−12 M in the presence of DEAE-Dx, and was improved a factor of three times compared to that in the absence of DEAE-Dx.View full abstract -
Hiroaki Miyaoka, Shouta Taira, Hidemichi Mitome, Kazuo Iguchi, Keita M ...1996 Volume 25 Issue 3 Pages 239-240
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSTwo new cembrane-type diterpenoids, sarcodiol (1) and 3,4-epoxysarcophytonin (4), were isolated from Okinawan soft coral of the genus, Sarcophyton. Their structures were determined from spectroscopic measurements, X-ray analysis and chemical reaction.View full abstract -
Motowo Yamaguchi, Masayuki Yabuki, Takamichi Yamagishi, Ken Sakai, Tar ...1996 Volume 25 Issue 3 Pages 241-242
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSStructural studies by X-ray analysis and NMR spectroscopy of the π-allyl complex, [Pd(η3-1,3-diphenylallyl)((S)-BINAP)]PF6·AcOEt, have been carried out, and revealed the stereochemical feature for the intermediate of palladium-catalyzed asymmetric allylic alkylation. The dissimilarity of the two phenyl groups attached to the π-allyl moiety is assumed to be one of the origin of the selectivity. In solution two configurational isomers, (syn, syn) and (syn, anti), exist.View full abstract -
Akira Endo, Uno Tagami, Yukari Wada, Miki Saito, Kunio Shimizu, Gen P. ...1996 Volume 25 Issue 3 Pages 243-244
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSTwo triple-decker trinuclear porphinatoruthenium(II) complexes bridged with pyrazine (pyr) or 4,4′-bipyridine (4,4′-bpy), [{(CO)(oep)RuII}(μ-pyr){RuII(oep)}(μ-pyr){RuII(oep)(CO)}] (H2oep = octaethylporphine) and [{(CO)(tpp)RuII}(μ-4,4′-bpy){RuII(tpp)}(μ-4,4′-bpy){RuII(tpp)(CO)}] (H2tpp = tetraphenylporphine), have been prepared. The first trinuclear complex was electrochemically oxidized in four steps.View full abstract -
Yusaku Sakata, Md. Azhar Uddin, Kazuo Koizumi, Katsuhide Murata1996 Volume 25 Issue 3 Pages 245-246
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSThe degradation of polypropylene (PP) was carried out at 380 °C by batch operation using silica-alumina catalyst in 1) liquid phase contact and 2) vapor phase contact. For liquid phase contact, the liquid hydrocarbon products with a yield of 69 wt% had a boiling points (BP) range of 36 to 270 °C, equivalent to the BP of normal paraffins n-C6 to n-C15. For vapor phase contact, the yield of liquid products was much lower (54 wt%) and the rate of liquid recovery was much slower.View full abstract -
Mamoru Ai, Kyoji Ohdan1996 Volume 25 Issue 3 Pages 247
Published: 1996
Released on J-STAGE: March 01, 2006
JOURNAL RESTRICTED ACCESSCitraconic anhydride (Methyl maleic anhydride) was found to be produced from pyruvic acid by an oxidative decarboxy condensation. The presence of oxygen is required to promote the reaction. The best catalyst is iron phosphate with a P/Fe atomic ratio of 1.2 and the optimum temperature is about 200 °C. The one-pass yield reaches 71 mol% at a pyruvic acid conversion of 98%. The main side-reaction is the formation of acetic acid and CO2 by oxidative C–C bond fission.View full abstract
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