Journal issue
Volume 16
, Issue 3
Showing 1-34 articles out of 34 articles from the selected issue
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Masato Yoshida, Kazuaki Shimokoshi, Michio Kobayashi1987 Volume 16 Issue 3 Pages 433-436
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSIn the reaction of bis(heptafluorobutyryl) peroxide with carbanions and a thiolate anion, two types of reactions were observed; one is an electron transfer reaction to give perfluoropropylated compounds and the other is a nucleophilic substitution.View full abstract -
Michiaki Takasaki, Kaoru Harada1987 Volume 16 Issue 3 Pages 437-440
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSArgon Arc Plasma containing nitrogen gas (nitrogen arc plasma) was directly introduced into water, and a disproportionation reaction of molecular nitrogen took place in aqueous solution to form ammmonia, nitrous acid, and nitric acid. The redox reaction of molecular nitrogen is interesting on the chemical evolutionary point of view as a possible route for the formation of ammonia under non-reducing conditions.View full abstract -
Tomoharu Ama, Sumio Kaizaki, Hiroshi Kawaguchi, Takaji Yasui1987 Volume 16 Issue 3 Pages 441-444
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSIminodiacetic acid containing asymmetric carbon with S chirality (H2ida(Cs); HOOCCH2NHC*HDCOOH) was prepared by stereospecific deuteration of (−)563CD-mer(O)cis(Nc)-[Co(ida)(edma)]. Using this H2ida(Cs), u-fac-[Co(ida(Cs))(mdien)]+ was prepared and optically resolved. On the basis of the 1H NMR spectra of the chelating ida(Cs), the absolute configuration of the (−)550CD isomer was assigned to ΔΛΔ.View full abstract -
Yoshio Ito, Shiro Terashima1987 Volume 16 Issue 3 Pages 445-448
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe title thienamycin intermediate was efficiently synthesized from (S)-ethyl lactate (3) by subjecting (3S,4S)-3-acetyl-4-[(S)-1-benzyloxyethyl]-2-azet idi none readily obtainable from 3, to sequential reactions in which base catalyzed elimination and regioselective hydroboration were employed as the key processes.View full abstract -
Masashi Hojo, Hironori Nagai, Minoru Hagiwara, Yoshihiko Imai1987 Volume 16 Issue 3 Pages 449-452
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSA new polarographic method to study complex formation has been applied to the anodic waves of halide ions in acetonitrile. The formation of complexes, such as (Li+)2Cl−, (HR)2Cl− (HR = p-bromophenol), (Li+)(HR)Cl−, (Li+)2(HA)Cl− (HA = benzoic acid) was clarified.View full abstract -
Tetsuo Otsuki1987 Volume 16 Issue 3 Pages 453-454
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe 3,4-double bond of photoexcited furocoumarin shows a higher reactivity than the 4′,5′-double bond toward simple olefins, leading to the formation of cyclobutane derivatives.View full abstract -
Yoshiharu Matsubara, Shin-ichi Takekuma, Hiroshi Yamamoto, Tetsuo Nozo ...1987 Volume 16 Issue 3 Pages 455-458
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSAutoxidation of guaiazulene either at 85 °C in N,N-dimethylformamide-0.5 M sulfuric acid or at 25–35 °C on the surface of a filter paper yielded, together with other products, the two title compounds which were shown to be in equilibrium and to constitute important intermediates for the intermolecular one-carbon transfer reactions frequently observed during autoxidation of many azulenic hydrocarbons.View full abstract -
Akiko Kobayashi, Reizo Kato, Hayao Kobayashi, Shinji Moriyama, Yutaka ...1987 Volume 16 Issue 3 Pages 459-462
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe crystal of a new ambient-pressure superconductor, κ-(BEDT-TTF)2I3 belongs to the monoclinic system with space group P21/c and a=16.387, b=8.466, c=12.832 Å and β=108.56°. The 2-dimensional(2D) metal sheets composed of paired BEDT-TTF molecules and the I3 anion sheets are arranged alternately along the a. direction. The orientation of the neighbouring paired molecules is almost perpendicular to each other.View full abstract -
Nobuharu Iwasawa, Teruaki Mukaiyama1987 Volume 16 Issue 3 Pages 463-466
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSAn essentially mild and efficient catalyst system, the combined use of trimethylsilyl chloride and tin(II) chloride, is effectively employed for the activation of acetals, aldehydes, orthoesters, and α,β-unsaturated ketones to accomplish the reaction with silyl enol ethers to give the corresponding addition products in good yields.View full abstract -
Katsuhiro Aoyagi, Hiroo Toi, Yasuhiro Aoyama, Hisanobu Ogoshi1987 Volume 16 Issue 3 Pages 467-470
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSHigh-spin cobalt(II) complexes of N-alkyl-octaethylporphyrin have been characterized by 1H-NMR measurements. Proton signals of N-alkyl groups and aromatic meso-protons were assigned by deuteration method. Axially coordinated imidazole resonance appeared at very low magnetic field.View full abstract -
Takayuki Suga, Hiroki Hamada, Toshifumi Hirata1987 Volume 16 Issue 3 Pages 471-474
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe biotransformation of the enantiomeric pairs of bicyclo[3.1.1]heptane derivatives with the cultured cells of Nicotiana tabacum was investigated. The hydrogenation of the C–C double bond of verbenone took place enantioselectively in preference of the (1S,5S)-enantiomer and the hydrogen attack occurred stereospecifically from the re-face at its C-2. The oxidation of the hydroxyl group of neoisopinocampheol occurred enantioselectively in preference of the (1S,2S,3R,5R)-enantiomer, whereas such an enantioselective oxidation was not the case for neoisoverbanol.View full abstract -
Takeaki Kakigano, Takahiro Kanda, Masaru Ishida, Shinzi Kato1987 Volume 16 Issue 3 Pages 475-478
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe reaction of bis(acyl) tellurides with primary or secondary amines or potassium ethanolate yielded the corresponding tellurocarboxylic acid salts, which are readily oxidized with iodine or benzenesulfonyl chloride to afford novel bis(acyl) ditellurides.View full abstract -
Teruaki Mukaiyama, Richard S. J. Clark, Nobuharu Iwasawa1987 Volume 16 Issue 3 Pages 479-482
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSTin(II) enolates react with p-benzoquinone and its mono-N-tosylimino derivative to give 1,2-adducts in good yield. These can be reduced in situ to α-(p-hydroxy- or p-aminophenyl) carbonyl derivatives by addition of dichloromethylsilane and dimethylaminopyridine.View full abstract -
Kiyoshi Otsuka, Takayuki Komatsu1987 Volume 16 Issue 3 Pages 483-484
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe catalytic activity of Sm2O3 for oxidative coupling of CH4 was measured at the conditions: P(CH4)/P(O2)=6, P(O2)=14.5 kPa, W/F=0.000223–0.0891 g·h·l−1 , and T=750 °C. STY of C2-compounds reached to 2.98 mol·g−1·h−1 at W/F of 0.000223 g·h·l−1. The catalytic activity of Sm2O3 was one to three orders of magnitude greater than those reported for other metal oxides.View full abstract -
Kazuhiro Maruyama, Hitoshi Tamiaki1987 Volume 16 Issue 3 Pages 485-486
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSIn methanol, quadricyclanes isomerized to norbornadienes by the catalytic action of silver(I), and methanol added to quadricyclanes by the action of proton. It was first confirmed that silver(I) was the real active species in the isomerization.View full abstract -
Shinji Nonoyama, Noriyuki Yonezawa, Kazuhiko Saigo, Tsuneo Hirano, Mas ...1987 Volume 16 Issue 3 Pages 487-490
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESS2a-Substituted dichlorocyclobuta[c]quinolin-3-one was obtained from the cross photocycloadduct of 2-quinolone and tetrachloroethylene by the reaction with bases or nucleophiles via cyclobutene formation and intermolecular SN2′ displacement along with trichloroethenyl-2-quinolone via [2+2] cycloreversion of the cyclobutene intermediate.View full abstract -
Teruaki Mukaiyama, Shu Kobayashi, Masanori Tamura, Yukihiro Sagawa1987 Volume 16 Issue 3 Pages 491-494
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe aldol reaction of silyl enol ethers with acetals or aldehydes, and the Michael reaction of silyl enol ethers with α,β-unsaturated ketones are efficiently catalyzed by the combined use of trityl chloride and tin(II) chloride under extremely mild conditions.View full abstract -
Syun-ichi Kiyooka, Fuminori Shiota, Tsutomu Shibuya1987 Volume 16 Issue 3 Pages 495-496
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSTriphenylgermylacetyltriphenylgermane, Ph3GeCH2COGePh3, with aldehydes has been found to afford the corresponding aldol products in the presence of boron trifluoride etherate in good yields.View full abstract -
Takayuki Suga, Rong-yu Zheng, Shinji Ohta, Takamitsu Yoshioka, Toshifu ...1987 Volume 16 Issue 3 Pages 497-500
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSWhen (E,E)-farnesol was enzymatically synthesized from an equimolar mixture of 3,3-dimethylallyl pyrophosphate and (E)- or (Z)-[4-2H]isopentenyl pyrophosphate (IPP) in the presence of iodoacetamide with a farnesyl pyrophosphate synthetase fraction prepared from Pisum sativum, the unusual addition of allylic residue to the re-re, face of the carbon-carbon double bond of IPP was found to occur. This finding was the first example of the unusual chain elongation against Cornforth’s stereochemical picture for the biosynthesis of isoprenoids.View full abstract -
Tsuneo Imamoto, Mitsumasa Ono1987 Volume 16 Issue 3 Pages 501-502
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSSamarium(III) iodide reacts with samarium metal in tetrahydrofuran under mild conditions to afford samarium(II) iodide in almost quantitative yield. A solution of samarium(II) iodide in tetrahydrofuran is prepared from samarium metal and iodine.View full abstract -
Hatsue Tamura, Tomohiro Sato, Kazuhide Ogawa, Shinichi Yano, Kenichi S ...1987 Volume 16 Issue 3 Pages 503-506
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe molecular structure of cholesteryl perfluoropropionate(CPFP) was determined by X-ray analysis. The side chain at C(17) has an extended conformation, while the perfluoropropionate chain at C(3) is disordered in a bent conformation. The molecules, the best planes through the tetracyclic ring-system of which are nearly parallel to the ac plane, form a layered structure.View full abstract -
Reizo Kato, Hayao Kobayashi, Akiko Kobayashi, Shinji Moriyama, Yutaka ...1987 Volume 16 Issue 3 Pages 507-510
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSElectrochemical oxidation of a solution containing BEDT-TTF, (n-C4H9)4NI3,and small amount of (n-C4H9)4NAuI2 gave a new ambient-pressure superconductor (Tc=3.6 K), which coexisted with the superconducting θ-type salt but was clearly distinguished by the X-ray examination. The crystal data are: (C10H8S8)2I3, monoclinic, P21/c, a=16.387(4), b=8.446(2), c=12.832(8) Å, β=108.56(3)°, V=1687.6 Å3, Z=2.View full abstract -
Eiichi Miyoshi, Yoshikazu Shizuri, Shosuke Yamamura1987 Volume 16 Issue 3 Pages 511-514
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSIn an effort to search for stimulants concerning with circadian rhythm in several nyctinastic plants, potassium chelidonate was isolated as a bioactive substance from the plant Cassia mimosoides L. and C. occidentalis L. This potassium salt has been proved to be quite effective for leaf-closing of the plants Mimosa pudica, Cassia mimosoides L. and others.View full abstract -
Shigeru Nishiyama, Yoshikazu Shizuri, Hiroaki Toshima, Masami Ozaki, S ...1987 Volume 16 Issue 3 Pages 515-518
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSEpiisocitreoviridinol, biogenetically relevant to citreoviridinol, has been isolated as a new metabolite of Penicillium citreo-viride B. (IFO 6049). Its stereostructure including the absolute configuration has been determined unambiguously by its total synthesis in optically active form.View full abstract -
Katsuyoshi Shibata, Katsuyoshi Urano, Masaki Matsui1987 Volume 16 Issue 3 Pages 519-520
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSWhen chalcones were treated with potassium superoxide (KO2) in acetonitrile under ultrasound irradiation, chalcone-acetonitrile adducts were obtained in moderate yields.View full abstract -
Takamasa Fuchikami, Yoshiko Shibata, Hisao Urata1987 Volume 16 Issue 3 Pages 521-524
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSPalladium-catalyzed reaction of polyfluoroalkyl halides with allylic alcohols in the presence of potassium carbonate gives polyfluoroalkylmethyl-substituted oxiranes directly. Perfluoroalkyl-substituted enynes can be also prepared from perfluoroalkyl iodides and terminal alkynes under similar conditions.View full abstract -
Hiroyuki Yamashita1987 Volume 16 Issue 3 Pages 525-528
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe asymmetric ring-opening of symmetrical oxiranes with aniline or trimethylsilyl azide is effectively catalyzed by zinc (2R,3R)-tartrate or cupric (2R,3R)-tartrate to give trans N-phenyl (β-amino alcohol or trans O-trimethylsilyl 2-azido alcohols in 17–52% ee. The latter azido products can be easily converted into optically active trans β-amino alcohols by two-step procedure.View full abstract -
Hiroshi Sasaki, Akihiko Ueno, Tetsuo Osa1987 Volume 16 Issue 3 Pages 529-532
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSMembrane potential across Poly(vinyl chloride) entrapping 2,3-Diphenylindenone oxide was reversibly controlled by UV and visible light irradiation. The magnitude of photo-induced potential change depended upon the concentration of electrolyte solution.View full abstract -
Satsuo Kamata, Fumiuki Ogawa, Masaomi Fukumoto1987 Volume 16 Issue 3 Pages 533-534
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSPolyvinyl chloride (PVC) membrane electrode based on o-xylene bis(diethyldithiocarbamate) which was newly synthesized as a neutral carrier, exhibits a Nernstian behavior to copper(II) ion for activity range of 10−1 M to 10−5 M. The electrode has given good response for the time and selectivity.View full abstract -
Ikuya Matsuura, Kiyomi Yoshida, Atsuhito Mori1987 Volume 16 Issue 3 Pages 535-538
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESS(VO)2P2O7 is oxidized to β-VOPO4 via β′-phase (d = 4.87, 4.23, 3.19, 2.64 Å) which was probably a phosphate such as VPO4.75 containing vanadium in the average oxidation state of + 4.5. However, when excess phosphorus is present in (VO)2P2O7, oxidation stops at the stage of β′-phase. This suggests that the new phase, β′-VPO4.75, is a selective catalyst for n-butane oxidation to maleic anhydride.View full abstract -
Hiroshi Nishihara, Masahiro Tateishi, Kunitsugu Aramaki, Toshiyuki Ohs ...1987 Volume 16 Issue 3 Pages 539-542
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSElectroreduction of α,α,α′,α′-tetrabromo-p-xylene at an indium tin oxide (ITO), platinum, copper or nickel electrode in ethereal solution afforded a thick and uniform poly(p-phenylene vinylene) film in the undoped state. Addition of Cr(CO)6 or Mo(CO)6 accelerated the film growth at the ITO electrode.View full abstract -
Hiroshi Nakamura, Akihiro Uehata, Akira Motonaga, Takeshi Ogata, Taku ...1987 Volume 16 Issue 3 Pages 543-546
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSEffects of external magnetic fields on electron transfer reactions in porphyrin–viologen linked systems (ZnPCnV) were investigated by laser photolysis. Rates of reverse electron transfer in the photogenerated intramolecular ion radical pair, as originated from quenching of porphyrin triplet by viologen, were remarkably suppressed (by a factor of ten for n=8) at above 0.1 T. The lifetime of the charge separated state could be correspondingly extended by the use of external magnetic fields, which perturb electron spin relaxation process.View full abstract -
Shinsaku Kanbe, Kohji Kishio, Koichi Kitazawa, Kazuo Fueki, Hidenori T ...1987 Volume 16 Issue 3 Pages 547-550
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe superconducting critical temperature TC increased with increase in x in (La1−xSrx)2CuO4−δ associated with the shortening of the Cu–O bond in the basal plane and the elongation of the lattice along the c-axis in the K2NiF4. structure. The results are discussed in terms of two-dimensional itinerant band formation of Cu:dx2-y2–O:pσ bond.View full abstract -
Ken-ichi Okamoto, Takaji Yasui, Jinsai Hidaka1987 Volume 16 Issue 3 Pages 551-554
Published: March 05, 1987
Released: March 27, 2006
JOURNAL FREE ACCESSThe crystal structure and the absolute configuration of the title complex cation, (−)570CD-mer-[Co(mida)(dien)]+, was determined by the X-ray diffraction study of its (−)580CD-(ethylenediaminetetraacetato)cobaltate(III) salt dihydrate. The relationship between the absolute configuration and the CD spectra for the mer isomers of the dien complexes with mida or iminodiacetate is also reported.View full abstract
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