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Haruo Kobayashi, Nobutsune Takezawa, Chiaki Minochi, Kazunari Takahash ...
1980 Volume 9 Issue 10 Pages
1197-1200
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
JOURNAL
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Turnover frequency, activation energy and selectivity of the methanol reforming reaction CH
3OH + H
2O = CO
2 + 3H
2 varied greatly with the specific surface area of metallic copper, when the title reaction was carried out over copper supported on silica. It was indicated that the reaction was strongly affected by the dispersion of copper.
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Masaaki Ogasawara, Kunio Shimizu, Hiroshi Yoshida
1980 Volume 9 Issue 10 Pages
1201-1204
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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An isothermal change at 77 K of the absorption spectrum of electron localized at 4 K in glassy 1-propanol revealed the elementary steps responsible for the spectral shift from IR to the visible region: the rapid shift (from 1800 to 1650 nm) and decay of the IR peak were followed by a gradual shift (from 800 to 580 nm) and an increase of the visible peak. The results support the two-trapping site model previously proposed for alcoholic matrices.
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Masamichi Akimoto, Yoshitaka Tsuchida, Etsuro Echigoya
1980 Volume 9 Issue 10 Pages
1205-1208
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The oxidizing activity of Mo
6+ ions in 12-heteropolymolybdates was found to correlate with the electronegativity of counter ion (H
+, alkali, and alkali-earth metal ions) as well as of hetero atom (P
5+, As
5+, and Si
4+).
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Hisashi Takei, Hideyuki Sugimura, Morikazu Miura, Hisashi Okamura
1980 Volume 9 Issue 10 Pages
1209-1212
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Alkenyl aryl sulfoxides could be alkylated stereoselectively via their lithium salts to afford α-alkylated (
E)-alkenyl sulfoxides. Reduction of the sulfoxides to the corresponding sulfides followed by nickel–phosphine complexes catalyzed coupling reaction with Grignard reagents gave trisubstituted olefins.
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Sotaro Miyano, Hiroshi Hokari, Akira Mori, Harukichi Hashimoto
1980 Volume 9 Issue 10 Pages
1213-1214
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The Mannich dimethylaminomethylation of carbonyl compounds is conveniently carried out via trimethylsilyl enol ethers by a combination of chloroiodomethane and
N,
N,
N′,
N′-tetramethyldiaminomethane in DMSO or DMF as the solvent at ambient temperature.
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Shinji Fushiya, Yoshikazu Sato, Shigeo Nozoe
1980 Volume 9 Issue 10 Pages
1215-1218
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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A new amino acid derivative possessing an iron chelating activity was isolated from an ethanol extract from the roots of
Avena sativa. The structure of this compound, avenic acid B, has been determined as 2(
S),3’(
S)-
N-(3-hydroxy-3-carboxypropyl)-homoserine (
1) on the basis of nmr analysis and by chemical synthesis.
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Kenji Itoh, Noriaki Oshima
1980 Volume 9 Issue 10 Pages
1219-1222
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Chloro(η
2,η
2-norbornadiene) [η
1,η
2-3-endo-(3′-nortricyclyl)norborn-5-en-2-endo-yl]ruthenium(II),
1a, prepared by zinc reduction of [RuCl
2(norbornadiene)]
n in the presence of norbornadiene and suitable proton sources such as alumina or ammonium chloride in acetonitrile, involves a coordinated alicyclic carbon–hydrogen bond.
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Yoji Sakito, Shin Tanaka, Masatoshi Asami, Teruaki Mukaiyama
1980 Volume 9 Issue 10 Pages
1223-1226
Published: October 05, 1980
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(−)-Malyngolide was synthesized from (
S)-2-hydroxy-2-nonyl-6-heptenal, prepared in high optical yield by an asymmetric synthesis using (
S)-2-(anilinomethyl)pyrrolidine as a chiral auxiliary.
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Shuji Oishi, Isao Tate
1980 Volume 9 Issue 10 Pages
1227-1228
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Na(La,Nd)(WO
4)
2 solid solution crystals were grown from high-temperature solutions of La
2O
3–Nd
2O
3–WO
3–Na
2CO
3 by slow cooling. These crystals were tetragonal, up to 4–5 mm in size, red purple and mostly transparent. The lengths of a and c axes were considered to obey Vegard’s law. This experimental result indicated that the complete series of solid solution isostructural with the end member crystals were obtained.
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Masamitsu Ochi, Masanori Watanabe, Iwao Miura, Makoto Taniguchi, Takas ...
1980 Volume 9 Issue 10 Pages
1229-1232
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Three new diterpenoids have been isolated from the brown seaweed
Dictyota linearis, and their structures determined by
1H and
13C NMR spectroscopy.
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Masamitsu Ochi, Masanori Watanabe, Masaru Kido, Yasuji Ichikawa, Iwao ...
1980 Volume 9 Issue 10 Pages
1233-1234
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The structure of a new diterpenoid, amijidictyol, isolated from the brown seaweed
Dictyota linearis has been determined as
4 on the basis of spectral evidence and X-ray analysis.
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Seiji Shinkai, Hisatake Hamada, Hideo Kuroda, Osamu Manabe
1980 Volume 9 Issue 10 Pages
1235-1238
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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3-Hydroxy-
N-methylacridinium iodide (Ac
+OH) oxidized alcohols with the aid of potassium t-butoxide, whereas
N-methylacridinium iodide (Ac
+) could not oxidize alcohols under the same reaction conditions. The results indicate that the 3-hydroxyl group is crucial in modifying an
N-methylacridinium nucleus as an NAD
+ model oxidizing agent.
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Shigeo Nishimura, Mikio Murai, Michio Shiota
1980 Volume 9 Issue 10 Pages
1239-1242
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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5α- And 5β-cholestan-3-ones are 30 and 17 times as reactive as 4-
t-butylcyclohexanone in Pd catalyzed competitive hydrogenation in
t-BuOH. The high reactivity of the steroid ketones and unusual hydrogenation stereochemistry on Pd have been explained on the basis of an attractive interaction of the steroid α-face with Pd.
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Mitsuru Nakayama, Yoshie Fukuoka, Hiroshi Nozaki, Akihiko Matsuo, Sh&u ...
1980 Volume 9 Issue 10 Pages
1243-1246
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The structure and absolute configuration of a new cyclopentenone derivative, (+)-kjellmanianone, isolated from the brown alga
Sargassum kjellmanianum has been determined as 5-carbomethoxy-5-hydroxy-3-methoxy-2-cyclopenten-1-one on the basis of the chemical and spectroscopic evidence and the X-ray analysis.
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Masakatsu Shibasaki, Yasuhiro Torisawa, Shiro Ikegami
1980 Volume 9 Issue 10 Pages
1247-1250
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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A synthesis of the sulfur analog of Δ
6-PGI
1 with potent inhibitory activity in platelet aggregation is described. The synthesis starting from the suitably protected Corey lactone includes the hydroxylation of the lactone and the novel intramolecular addition of the sulfenyl bromide.
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Makoto Komiyama, Hidefumi Hirai
1980 Volume 9 Issue 10 Pages
1251-1254
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The hydrolyses of seven alkyl benzoates are catalyzed by α-cyclodextrin. These results indicate that the general base catalysis by α-cyclodextrin, previously found for the first time in the hydrolysis of 2,2,2-trifluoroethyl 4-nitrobenzoate, is applicable to other alkyl esters.
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Wataru Ando, Masayuki Ikeno
1980 Volume 9 Issue 10 Pages
1255-1256
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Diiododimethylsilane reacts with various ketones in the presence of zinc to give the corresponding reductive condensation products in good yields.
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Osamu Takazawa, Hiroshi Tamura, Kunio Kogami, Kazuo Hayashi
1980 Volume 9 Issue 10 Pages
1257-1258
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Synthesis of α-ambrinol was successfully accomplished by cyclization of dihydro-γ-ionone ethylene acetal which was prepared by the titanium(IV)-promoted reaction of 3,3-dimethyl-1-trimethylsiloxycyclohexene with methyl vinyl ketone ethylene acetal followed by exo-methylenation with triphenylphosphonium methylide.
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Kazuhiro Maruyama, Kazutoshi Terada, Yoshinori Naruta, Yoshinori Yamam ...
1980 Volume 9 Issue 10 Pages
1259-1262
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Use of copper(I)-nitrogen ligand catalysts, such as Ph
3PCuCl.bipy (
1), Ph
3PCuCl.phen (
2), Ph
3PCuCl.phtha (
3), and Ph
3PCuBr.py (
4), enables the photochemical isomerization of norbornadiene to quadricyclane in longer wavelength than 350 nm, in which CuCl catalyst itself can not induce such an isomerization.
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Yoshihiko Sadaoka, Yoshiro Sakai, Noboru Yamazoe, Tetsuro Seiyama
1980 Volume 9 Issue 10 Pages
1263-1266
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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In the thermal desorption spectra of β-CoPc–NO
2 system two peaks appeared. The first and second peaks were assigned to the desorption of the NO
2 on the pseudoaromatic rings and on the Co ions, respectively. The electrical conductance was enhanced mainly by the interaction of the pseudoaromatic ring with NO
2.
View full abstract
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Teruaki Suzuki, Hajime Kikuchi, Etsuro Kurosawa
1980 Volume 9 Issue 10 Pages
1267-1270
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Two new sesquiterpenoids, (
E)-γ-bisabolen-8,9-epoxide and isocycloeudesmol, have been isolated from
L. nipponica Yamada (Rhodophyta, Rhodomelaceae) and their structures have been determined by spectroscopic and chemical evidences.
View full abstract
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Kaoru Harada, Katsuji Shiono, Shinya Nomoto
1980 Volume 9 Issue 10 Pages
1271-1274
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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A new asymmetric transformation of amino acids was described. Thus, when
N-salicylidene-
D-alanyl-,
D-phenylalanyl-, or
D-phenylglycyl-
L-isoleucinatocopper(II) was incubated at pH 8.5 and 80°C, the resulting mixture at equilibrium contained a complex of
L-
L-dipeptide in the contents of 63–76%. The epimerization of dipeptides is based on the enhanced activity of
N-terminal amino acids through complex formation.
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Norio Miura, Yoshihiro Ozawa, Noboru Yamazoe, Tetsuro Seiyama
1980 Volume 9 Issue 10 Pages
1275-1276
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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A new technique for hydrogen separation using a short-circuited electrochemical cell constructed by use of a solid electrolyte was described with preliminary experimental data. With phosphomolybdic acid as a proton conductor, a short-circuit current density of 7.4 mA/cm
2 or a rate of hydrogen separation of 3.1 cm
3/h·cm
2-electrode, was attained experimentally.
View full abstract
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Haruhiko Tomoda, Shojiro Saito, Shojiro Ogawa, Shinsaku Shiraishi
1980 Volume 9 Issue 10 Pages
1277-1280
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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In the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene or 1,5-diazabicyclo[4.3.0]non-5-ene, metal-free phthalocyanine was obtained by heating phthalonitrile in alcohols. Addition of a copper(II) salt in the reaction gave copper phthalocyanine in a good yield.
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Hisashi Okawa, Wakako Kanda, Sigeo Kida
1980 Volume 9 Issue 10 Pages
1281-1284
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Copper(II)–iron(III) binuclear complexes, CuFe(fsaR)Cl·nH
2O, with
N,
N′-bis(3-carboxysalicylidene) alkanediamines (H
4fsaR) were prepared and characterized. Cryomagnetic measurements indicated a considerably strong antiferromagnetic spin-exchange interaction operating between the metal ions. The exchange integrals (ca.−50 cm
−1) are the largest among the copper(II)–iron(III) complexes so far reported, and hence the complexes mimic the cytochrome oxidase active center.
View full abstract
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Mitsuru Sano, Kazuo Taniguchi, Hideo Yamatera
1980 Volume 9 Issue 10 Pages
1285-1286
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Extended X-ray absorption fine structure (EXAFS) spectroscopy has been applied to the study of an aqueous solution. An X-ray spectrum for 0.32 M Cu(CLO
4)
2 was measured by a multi-detection apparatus of laboratory scale with a usual X-ray tube and a position-sensitive detector and analyzed preliminarily by Fourier transformation method to give the Cu–O distances of 1.94 and 2.46 Å (assuming α = 0.39 Å), in agreement with the X-ray diffraction result.
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Akira Inada, Yushin Nakamura, Yutaka Morita
1980 Volume 9 Issue 10 Pages
1287-1290
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Facile dehydrogenations of indolines to indoles were performed with the catalytic amount of bis(salicylidene)ethylenediaminatocobalt(II) and bis(3-methoxysalicylidene)ethylenediaminatocobalt(II) under mild conditions in 55–92% yields.
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Tadashi Endo, Yukiko Takeda, Toyohiko Orii, Tomoji Murata, Miyuki Saka ...
1980 Volume 9 Issue 10 Pages
1291-1294
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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In oxidation of a pair of associating thiols (
1d and
2) with O
2, specific weak interactions related to their geometrical shape such as CH···N and CH···SH interactions are suggested to be responsible for selective molecular recognition.
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Masatoshi Hirayama, Yoshimichi Kawamata
1980 Volume 9 Issue 10 Pages
1295-1298
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The
59Co shifts of tris (acetylacetonato)Co(III) induced by Ln(fod)
3 and Ln(dpm)
3(Ln=La, Pr, Nd, Sm, Eu) were determined by observing separately the resonances of free and complexed Co(acac)
3. An attempt to separate a contact contribution using theoretical D and ⟨S
z⟩ values was successfully made by assuming the increase in an adduct formation shift with increasing number of 4f electrons.
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Juro Ojima, Yukiko Nakagawa, Kazuyo Wada, Masayuki Terasaki
1980 Volume 9 Issue 10 Pages
1299-1302
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Syntheses of 2,9,14-trimethyl-
2, 14-methylbenzo[
h]
4, and 2-methyldibenzo[
h,
n]-10,12-bisdehydro[21]annulenone
5 are described. The effect of α-methyl substitution and benzannelation for the bisdehydro[21]annulenone ring sytem are discussed.
View full abstract
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Seiji Shinkai, Yumiko Kusano, Kazuyoshi Shigematsu, Osamu Manabe
1980 Volume 9 Issue 10 Pages
1303-1306
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The thermal cis-to-trans isomerization of an azobenzene covalently-bridged to azacrown ether occurs via the inversion mechanism, and the rotational mechanism is not allowed owing to the rigid ring structure. By using the “standard” azobenzene, it was demonstrated that the thermal isomerization of most
cis-azobenzenes occurs via the inversion mechanism, the activation parameters being subject to a good ΔH
\
eweq–ΔS
\
eweq compensation relationship.
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Hisashi Takei, Yoshimasa Fukuda, Kazuhiro Sugaya, Takeo Taguchi, Tatsu ...
1980 Volume 9 Issue 10 Pages
1307-1310
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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α-Bromo-α,β-unsaturated esters and α-bromobutenolides reacted with sodium salts of methyl malonamates to afford cyclopropanes, α-methoxycarbonyllactams and 5-amino-4-methoxycarbonyl-2,3-dihydrofurans. The last compounds could be easily converted into α-methoxycarbonyl-γ-lactones. The ratio of these compounds formed is influenced by the structures of both malonamates and unsaturated compounds, especially by the substituents at nitrogen of the malonamates, and by the reaction conditions.
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Hisashi Takei, Yoshimasa Fukuda, Takeo Taguchi, Tatsuo Kawara, Hidemi ...
1980 Volume 9 Issue 10 Pages
1311-1314
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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A new method for the stereoselective synthesis of (±)-avenaciolide and its analogues via methoxycarbonyl- or anisyloxycarbonyldi-γ-lactones, which could be easily prepared by the reaction of γ-substituted α-bromobutenolides with sodium salt of methyl or anisyl malonamate in good yields, was described.
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Masataka Watanabe, Akira Yoshikoshi
1980 Volume 9 Issue 10 Pages
1315-1318
Published: October 05, 1980
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2,3,3aα,4,5,5a,6,9,9aα,9bβ-Decahydro-3α,9α-dimethyl-5aβ-methoxycarbonyl-2-oxonaphtho[2,3-
b]furan (
2) accessible from α-santonin was transformed into (+)-deoxyvernolepin (
1). The preparation of some α-methylenelactones related to
1 has also been described.
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Katsuhiko Miyoshi, Yuuko Matsumoto, Hayami Yoneda
1980 Volume 9 Issue 10 Pages
1319-1322
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The chiral equilibrium of [Cr(ox)
2(phen)]
− was found to be displaced greatly (ca. 18% O.Y.) in water toward its (+)
546- or (−)
546- enantiomer upon the addition of
l-(8
S,9
R)-quinine or
d-(8
R,9
S)-quinidine hydrochloride, respectively, which was attributed to the combined action of electrostatic and hydrophobic (or π-π) interactions between the complex and
l-quininium or
d-quinidinium cation.
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Masanobu Iguchi, Atsuko Nishiyama, Hideo Eto, Shosuke Yamamura
1980 Volume 9 Issue 10 Pages
1323-1326
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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Triacetic lactone, 4-hydroxycoumarins, and kojic acid derivative were subjected to anodic oxidation in MeOH containing LiClO
4 or NaCN to afford the corresponding methoxy or cyano compounds. In a basic media, however, dipyrone and dicoumarol were produced from triacetic lactone and 4-hydroxycoumarin, respectively. The formation process of 3-methoxytriacetic lactone as well as of 3-cyanotriacetic lactone is also presented.
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Tomoya Kitazume, Nobuo Ishikawa
1980 Volume 9 Issue 10 Pages
1327-1328
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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α,α-Difluoroalkylamines, such as 1-diethylamino-2-chloro-1,1,2-trifluoroethane (
1) and 1-diethylamino-1,1,2,3,3,3-hexafluoropropane (
2), were found to be useful dehydrating agents for the synthesis of acetylenic ketones from β-diketones in the presence of freeze-dried potassium fluoride in acetonitrile.
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Tadashi Suehiro, Seiichi Masuda, Nobuyuki Motoyama, Masaru Sasaki
1980 Volume 9 Issue 10 Pages
1329-1330
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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By the reaction between nitrosoarenes and diphenylmethyleneamino radicals at 60–70 °C aryl radicals are generated together with nitrogen and benzophenone.
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Tsutomu Sakakibara, Haruhiko Matsuyama
1980 Volume 9 Issue 10 Pages
1331-1334
Published: October 05, 1980
Released on J-STAGE: March 27, 2006
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The reaction of
N,
N-dimethylanilines p-substituted by electron-donating groups with palladium(II) acetate in a mixed solvent of benzene and acetic acid gave cyclodimerized products, i.e. 5,6,11,12-tetrahydrodibenzo[
b,
f][1,5]diazocine derivatives in good yields, via novel C–C bond formation, along with small amount of acetoxylated or demethylated products. Radical cation species was suggested as a cyclodimerization intermediate.
View full abstract
