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Volume 11, Issue 2
Displaying 1-30 of 30 articles from this issue
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Teruaki Mukaiyama, Tetsuo Miwa, Takashi Nakatsuka1982 Volume 11 Issue 2 Pages 145-148
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSTwo amino pentoses, 2-acetamido-2-deoxy-D-arabinose and -D-ribose, are conveniently synthesized from 2-amino-2-deoxy-D-pentonic acid derivatives, obtained by the stereoselective reaction of the chiral imine 1 with 2,3-O-isopropylidene-D-glyceraldehyde.View full abstract -
Hiroshi Awano, Katsumichi Ono, Kenkichi Murakami1982 Volume 11 Issue 2 Pages 149-152
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe equivalent conductivities, Λ, of potassium and sodium thiocyanate in ethanol and nitromethane solutions containing polyoxyethylene (POE) have been measured as a function of POE concentration, Cp, at 298.15 K. The Λ vs. Cp curves have peculiar features. These features have been explained in terms of the cooperative association of cation and anion on a POE chain.View full abstract -
Hajimu Kawa, Fumihiko Yamaguchi, Nobuo Ishikawa1982 Volume 11 Issue 2 Pages 153-156
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESS(+)-Di(perfluoro-2-propoxypropionyl)methane, (+)-4, an optically active β-diketone, was prepared in a good yield from (+)-perfluoro-2-propoxypropionic acid. The europium chelate of (+)-4 was found to be a very effective and useful NMR shift reagent for the direct determination of the enantiomeric composition of chiral compounds.View full abstract -
Mitsuyoshi Sato, Koichiro Oshima1982 Volume 11 Issue 2 Pages 157-160
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCarbonyl compounds have been deoxygenatively dimerized to alkenes with the title reagent. Deoxygenation of epoxides to alkenes, reductive coupling of allylic and benzylic alcohols to hydrocarbons, and reduction of alkynes to alkenes are also described.View full abstract -
Taira Harada, Teruaki Mukaiyama1982 Volume 11 Issue 2 Pages 161-164
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSMetallic tin or activated metallic tin, prepared by reduction of stannous chloride with lithium aluminum hydride, smoothly reacts with α-haloesters to yield tin enolates, which in turn react with carbonyl compounds under mild conditions to give, after hydrolysis, β-hydroxyesters in high yields.View full abstract -
Takashi Yoshida, Shojiro Saito1982 Volume 11 Issue 2 Pages 165-168
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe treatment of the tert-alkyl sulfones bearing carbonyl group at the β-position with 5 % hydrochloric acid in THF at 30–65 °C afforded β-substituted α,β-unsaturated ketones and aldehydes in excellent yields.View full abstract -
Kazuyori Konishi, Akihiro Yoshino, Morimatsu Katoh, Hiroshi Matsumoto, ...1982 Volume 11 Issue 2 Pages 169-170
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe 15N chemical shifts have been observed for three enriched title compounds in diethyl-d10 ether by means of an INDOR technique. The shifts are discussed in terms of the electron densities on the ring nitrogens.View full abstract -
Yoshihito Osada, Yasuhiro Iino, Yu Iriyama1982 Volume 11 Issue 2 Pages 171-174
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSInvertase was immobilized by the plasma-initiated polymerization, exposing the glow-discharge plasma for 60–90 sec onto the aqueous vinyl monomers, followed by the postpolymerization at room temperature. Obtained enzymes in the pellet and the film exhibited high activities for a long period of time without any leakage of the enzyme.View full abstract -
Hiroki Haraguchi, Kensei Kobayashi, Masahiro Matsui, Keiichiro Fuwa1982 Volume 11 Issue 2 Pages 175-176
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSAlkaline phosphatase activity dissolved in sea and lake water was determined, and alkaline phosphatase was identified as dissolved chemical species of trace metals (zinc) in natural water using high performance liquid chromatography (HPLC).View full abstract -
Shuki Araki, Yasuo Butsugan1982 Volume 11 Issue 2 Pages 177-178
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCoupling reaction of 3-furylmethylmagnesium bromide with geranyl diethyl phosphate in the presence and the absence of copper(I) iodide affords dendrolasin and sesquirosefuran, respectively, in ca. 80 % selectivity.View full abstract -
Akira Fujishima, Yasuhisa Maeda, Sachio Suzuki, Kenichi Honda1982 Volume 11 Issue 2 Pages 179-182
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe three methods in the title were directly compared by using an electrode made of luminescent Cu2+-doped ZnO. The values of the quantum efficiency as measured by the three methods were in good agreement. The feasibility of the methods is briefly discussed.View full abstract -
Hiroshi Miura, Kazuo Sugiyama, Soichiro Kawakami, Toshiyuki Aoyama, Ts ...1982 Volume 11 Issue 2 Pages 183-186
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe selective hydration of acrylonitrile to form acrylamide has been studied on several metal oxide catalysts. MnO2, CuO and Co3O4 catalysts were found to be active and selective. Catalytic activities were strongly affected by the method of preparation. Hydration activity of MnO2 was related to the amount of phenol adsorption.View full abstract -
Ichiro Okura, Makoto Takeuchi, Shin Kusunoki, Shigetoshi Aono1982 Volume 11 Issue 2 Pages 187-188
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe formation of the reduced form of cytochrome c3 was established when an aqueous solution containing Zn-TPPS3, cytochrome c3 and triethanolamine was irradiated by visible light. When hydrogenase was added to the system hydrogen evolution was observed by the irradiation of sunlight.View full abstract -
Hiroshi Takaku, Kazuo Kamaike1982 Volume 11 Issue 2 Pages 189-192
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESS4-Methoxybenzyl group was introduced directly to the 2′-hydroxyl group from the reaction of adenosine with 4-methoxybenzyl bromide in the presence of sodium hydride. The 2′-O-(4-methoxybenzyl)adenosine can be successfully used in the synthesis of oligoribonucleotides via phosphotriester approach. The 4-methoxybenzyl group was removed rapidly from the oligoribonucleotides by triphenylmethyl fluoroborate and the completely deblocked oligoribonucleotides were characterized by emzymatic hydrolysis.View full abstract -
Youko Yoshitoku, Masataka Moriyasu, Yohei Hashimoto1982 Volume 11 Issue 2 Pages 193-194
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSBy using TBPE as ion-pairing counter-ion whose absorption spectrum differs markedly from that of the resulting ion-pairs, ion pair high pressure liquid chromatographic determination of many organic bases was carried out sensitively without the absorptive background of TBPE added in the mobile phase.View full abstract -
Masatoshi Hirayama, Yuko Sasaki1982 Volume 11 Issue 2 Pages 195-196
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe lanthanoid-induced 195Pt shifts were observed on the successive addition of Pr(fod)3 (L) to a 0.46 mol·dm−3 CDCl3, solution of Pt(acac)2(S) at an ambient probe temperature (25°C). The equilibrium constant and 195Pt intrinsic shift were estimated with the least squares fits of data to a plausible equilibrium between S and its 1:1 adduct with L formed via bidentate interaction.View full abstract -
Hiroshi Takaku, Kazuo Kamaike, Kenichi Kasuga1982 Volume 11 Issue 2 Pages 197-200
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESS5′-O-Dimethoxytrityl-2′-O-tetrahydropyranyl-N2-benzoylguanosine smoothly reacts with 4-chlorophenyl 5-chloro-8-quinolyl hydrogen phosphate in the presence of 8-quinolinesulfonyltetrazolide (QS-te) to give 5′-O-dimethoxytrityl-2′-O-tetrahydropyranyl-N2-benzoylguanosine 3′-(4-chlorophenyl, 5-chloro-8-quinolyl) phosphate in high yield without a side product such as O6-phosphorylated guanosine.View full abstract -
Donald J. Burton, Yoshio Inouye1982 Volume 11 Issue 2 Pages 201-204
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSIn contrast to the formation of 2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithietane from hexafluoropropene, potassium fluoride, and sulfur, perfluoro-2-butene and perfluoro-pentenes react with potassium fluoride and sulfur to form perfluoro-1,3-dithioles via intermediate thioenolate anions.View full abstract -
Akira Suzuki, Nobuyuki Nishimiya, Shuichiro Ono1982 Volume 11 Issue 2 Pages 205-208
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe hydriding behaviors and crystallographic characteristics of Zr(FexMn1−x)2 alloys, wherein x is 0 to 1, vary depending on the x value. On substituting Mn of ZrMn2 with Fe, the dissociation pressure of its hydride increases monotonously at temperatures around 400K.View full abstract -
Yasufumi Ohfune, Kazutoshi Takaki, Hiromu Kameoka, Tsutomu Sakai1982 Volume 11 Issue 2 Pages 209-210
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSSemburin, a new 2,8-dioxabicyclo[3,3,1]nonane skeleton, has been synthesized in the stereoselective manner from α-pyrone.View full abstract -
Gary A. Epling, Ung Chan Yoon1982 Volume 11 Issue 2 Pages 211-214
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe photochemistry of mefloquine, an experimental antimalarial drug, has been examined with an eye towards understanding its comparatively low phototoxicity.View full abstract -
Morio Asaoka, Masayoshi Abe, Takashi Mukuta, Hisashi Takei1982 Volume 11 Issue 2 Pages 215-218
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe intramolecular 1,3-dipolar cycloaddition of the nitrile oxides derived from ω-nitroalkyl acrylates gave isoxazoline fused macrocyclic lactones. The direction of 1,3-dipolar cycloaddition is strongly affected by the ring size of forming lactones. Utilizing this method, total synthesis of (±)-A26771B was achieved.View full abstract -
Tamotsu Fujisawa, Toshio Sato, Toshiyuki Itoh1982 Volume 11 Issue 2 Pages 219-220
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESS10-Hydroxy-(E)-2-decenoic acid, (E)-2-decenedioic acid (Royal jelly acids), and 9-oxo-(E)-2-decenoic acid (queen substance) were synthesized via 10-hydroxy-3-decenoic acid and 9,9-ethylenedioxy-3-decenoic acid, respectively, prepared easily by the regioselective ring-opening reaction of β-vinyl-β-propiolactone with Grignard reagents in the presence of copper(I) catalyst.View full abstract -
Mitsuo Kira, Hideki Sakurai1982 Volume 11 Issue 2 Pages 221-222
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe optimized geometry of the 6-silylcyclohexadienyl radical calculated by the energy gradient method with the STO-3G basis set shows that the radical has a distorted ring structure with the energy minimum at 4.3° of out-of-plane angle.View full abstract -
Akira Hosomi, Hirokazu Iguchi, Hideki Sakurai1982 Volume 11 Issue 2 Pages 223-226
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSFactors influencing the regioselectivity of the reaction of the “crotyl” Grignard reagent (1) with trimethylchlorosilane are investigated. The regioselectivity of the reaction is strikingly controlled by changing solvent and reaction temperature and by the addition of cuprous iodide. (1-Methyl-2-propenyl)trimethylsilane is obtained selectively in THF at low temperature in the presence of cuprous iodide.View full abstract -
Makoto Nitta, Akihiko Omata, Masamichi Namiki1982 Volume 11 Issue 2 Pages 227-230
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe photochemical or thermal reaction of exo-6-methoxy-1,5,6-trimethyl- or exo-6-methoxy-1,3,5,6-tetramethyltricyclo[3.2.1.02,7]oct-3-en-8-one resulted in the novel formation of rapidly equilibrating valence isomers of norcaradiene-cycloheptatriene derivative via a ketene intermediate.View full abstract -
Hidemichi Fukawa, Yoshiyasu Terao, Kazuo Achiwa, Minoru Sekiya1982 Volume 11 Issue 2 Pages 231-232
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA new method for introducing carbon unit at the α-position of alicyclic amines has been exploited. The method involves a reaction of trimers of alicyclic imines with malonic acid derivatives, of which decarboxylation leads to a formation of carbon-carbon bond at the α-position of alicyclic amines.View full abstract -
Hiroyuki Kikuchi, Yasumasa Tsukitani, Hajime Nakanishi, Iwao Shimizu, ...1982 Volume 11 Issue 2 Pages 233-236
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSFour new butenolides (1a–d) were isolated from the Japanese gorgonian Euplexaura flava(Nutting). The structures of these compounds were elucidated from spectral data and chemical reactions.View full abstract -
Masahiko Yamaguchi, Teruaki Mukaiyama1982 Volume 11 Issue 2 Pages 237-240
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSIn the presence of triethylaluminum, oxyallyl anions derived from 2-allyloxybenzimidazoles react with aldehydes in highly regio-and stereoselective manner to afford α-adducts in good yields. The adducts are stereospecifically converted to cis-vinyloxiranes in good yields.View full abstract -
Masahiro Murakami, Teruaki Mukaiyama1982 Volume 11 Issue 2 Pages 241-244
Published: February 05, 1982
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA boron enolate of an ester was generated in situ by the treatment of ethoxyacetylene with mercury(II) acetate and diphenylborinic acid, and the boron enolate thus formed further reacted with aldehydes to give β-hydroxyesters and β-acetoxyesters in good yields. The reaction was successfully applied to the stereoselective synthesis of 2-deoxy-D-ribose.View full abstract
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