-
Yuichiro Haramoto, Hiroyoshi Kamogawa
1987 Volume 16 Issue 5 Pages
755-758
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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(+)-4-(2-Methylbutyloxycarbonyl)phenyl 4-(5-alkyl-1,3-dioxan-2-yl)benzoate (
9) and (+)-4-[(2-methylbutyloxy)phenyl]4-(5-alkyl-1,3-dioxan-2-yl)benzoate and corresponding dithianes and oxathianes were synthesized. Only compounds
9 exhibited the ferroelectric liquid crystal behavior (R=n-c
11H
23: −4 SmC 93 °C).
View full abstract
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Yoshio Okamoto, Eiji Yashima, Tamaki Nakano, Koichi Hatada
1987 Volume 16 Issue 5 Pages
759-762
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Asymmetric oligomerization of triphenylmethyl methacrylate (TrMA) was carried out with (−)-sparteine-fluorenyllithium complex in toluene at −78 °C and the oligomers of methyl methacrylate (DP=2 and 3) derived therefrom were separated into diastereomers and optical isomers on silica gel and chiral HPLC columns, respectively. On the basis of the obtained data, the mechanism of asymmetric polymerization of TrMA was discussed.
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Yutaka Ishigami, Yasuo Gama, Hitoshi Nagahora, Muneo Yamaguchi, Hisae ...
1987 Volume 16 Issue 5 Pages
763-766
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Rhamnolipid B and its precursor A, both microbial and membranous constituent, reversibly changed morphologies of their molecular aggregates from vesicles under acidic conditions, to lamella, lipid particles, and finally to micelles under weakly acidic conditions within a narrow pH range of about 5–7.
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Masato Machida, Koichi Eguchi, Hiromichi Arai
1987 Volume 16 Issue 5 Pages
767-770
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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The combustion activities of various oxide catalysts were investigated using BaO·6Al
2O
3 as support. Conventional impregnation of oxide catalysts only lead to a decrease in surface area of the support. Cation-substituted barium hexaaluminates generally retained the large surface area. In particular, BaMnAl
11O
19−α′, showed the excellent activity and the large surface area of 13.7 m
2/g after calcination at 1300 °C.
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José M. Saa, Antonia Llobera, Pedro M. Deya
1987 Volume 16 Issue 5 Pages
771-774
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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p-Hydroxybenzylamines and primary
p-hydroxybenzamides undergo oxidative degradation by the action of Fremy’s salt, thus providing
p-benzoquinones in good yields.
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Hiroshi Seki, Oyo Mitsunobu
1987 Volume 16 Issue 5 Pages
775-778
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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The reagent formed by the reaction of 2-chlorophenyl phosphorodichloridate with an equimolar amount of 5-nitrobenzotriazole was treated with protected ribonucleosides having free 3′-OH, followed by protected ribonucleosides having free 5′-OH in pyridine for 8 h (the second step), the corresponding dinucleoside phosphates being obtained in 55–84% yields. When the second step was carried out in the presence of 2,6-lutidine, the yields were increased to 80–90% within 2h. By this procedure, the anticodon triplet of yeast tRNA
Lys was prepared in 71% yield.
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Masayuki Ohno, Hisaji Uzawa, Teruhisa Miyazaki, Kimio Tarama
1987 Volume 16 Issue 5 Pages
779-782
Published: May 05, 1987
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We have studied on the mechanism of the photocatalytic dehydrogenation of methanol over Pt/TiO
2. D
2 was only evolved from CH
3OD, and D
2, HD, and H
2 were detected in the evolved gas in the case of the mixed sample of CH
3OD and CH
3OH. These results show that the evolved hydrogen came from hydroxyl hydrogen atom of methanol. And the rate determining step was discussed in connection with comparison among the evolution rates of H
2, HD, and D
2, respectively.
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Hiroshi Suginome, Jian Bo Wang, Shinji Yamada
1987 Volume 16 Issue 5 Pages
783-786
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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We report the syntheses of 3α-hydroxy-11-thia-5β,9β-pregnane, the first 11-thiasteroid, and 3α-hydroxy-11-oxa-5β-pregnane by the replacement of the 11-carbonyl group of 3α-hydroxy-5β-pregnane-11,20-dione acetate by a sulphur or an oxygen atom.
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Sadatoshi Akabori, Sadao Sato, Yoichi Habata, Kayoko Kawazoe, Chihiro ...
1987 Volume 16 Issue 5 Pages
787-790
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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The X-ray analysis of 4,7,10-trioxa-1,13-dithia[13](1,1′)ruthenocenophane and its PdCl
2 complex revealed that the Pd atom bonded to the sulfur atoms of the ligand and the torsion angle (69.2°) around the z-axis of the ruthenocenophane nucleus in the metal-free ligand is much larger than the corresponding one (0.4°) in the complex. These results are completely opposite of the case of [10](1,1′)ruthenocenophane and its Pt complex.
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Takeshi Yura, Nobuharu Iwasawa, Teruaki Mukaiyama
1987 Volume 16 Issue 5 Pages
791-794
Published: May 05, 1987
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The Michael addition reaction of tin(II) enolates with α,β-unsaturated ketones proceeds smoothly by the use of chlorotrimethylsilane as an activator to give the corresponding addition products in good yields.
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Hiroyuki Ishibashi, Tatsunori Sato, Maki Irie, Suzumi Harada, Masazumi ...
1987 Volume 16 Issue 5 Pages
795-798
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Tributyltin hydride-azobisisobutyronitrile induced radical cyclization of
N-allyl-α-chloro-α-(methylthio)acetamides afforded γ-butyrolactams. This method was applied to the formal total synthesis of (±)-pseudoheliotridane.
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Hitoshi Saito, Yoshio Nishimura, Shinichi Kondo, Hamao Umezawa
1987 Volume 16 Issue 5 Pages
799-802
Published: May 05, 1987
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Syntheses of all four possible diastereomers of etoposide and its aminoglycosidic analogues have been achieved via optical resolution of (±)-podophyllotoxin by glycosidation with
D- and
L-sugars.
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Kiyoshi Matsumoto, Shiro Hashimoto, Tadashi Okamoto, Shinichi Otani, J ...
1987 Volume 16 Issue 5 Pages
803-804
Published: May 05, 1987
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The preparation of hydroxyamides from a variety of lactones and amines has been achieved at 9 kbar and 30 °C or 65 °C. The yields of hydroxyamides were excellent to moderate.
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Kiyoshi Matsumoto, Tadashi Okamoto, Akira Sera, Kuniaki Itoh, Kensaku ...
1987 Volume 16 Issue 5 Pages
805-806
Published: May 05, 1987
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The first direct X-ray crystal structure determination of a 1:2 adduct obtained by Diels–Alder reaction of [2.2]paracyclophane and
N-methylmaleimide is reported, establishing the structure arising from 4,7- and 13,16-additions.
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Kiyoshi Matsumoto, Takane Uchida, Hideyuki Konishi, Youko Watanabe, Ki ...
1987 Volume 16 Issue 5 Pages
807-808
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Representative pyridinium dicyanomethylides underwent regioselectively 1,3-dipolar cycloaddition onto methyl 3-trimethylsilyl-2-propynate and methyl 3-phenyl-2-propynate yielding the corresponding indolizines whereby 1-methoxycarbonylindolizines forms either exclusively or predominantly, in agreement with HOMO(ylide)–LUMO(dipolarophile) interaction as revealed by CNDO/2 calculation.
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Kazuhiko Tanaka, Keizaburo Minami, Aritsune Kaji
1987 Volume 16 Issue 5 Pages
809-810
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Treatment of
N-phenyl-3-phenylthio-2-(phenylthiomethyl)propanamide with 3.3 equiv. of butyllithium in THF-TMEDA produced a new dianion of 2-(phenylthio)cyclopropanecarboxamide which could react with a variety of electrophiles to give cyclopropanes with high stereoselectivity.
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Yasuo Kubo, Kensen Okusako, Takeo Araki
1987 Volume 16 Issue 5 Pages
811-814
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Irradiation of 1,2-naphthalenedicarboxylic thioanhydride (
5a) or its 2,3-isomer with alkenes in acetonitrile gave naphthothiepindiones by insertion of alkenes into C(=O)–S bond of the thioanhydride. Reactions of
5a with cis- and trans-2-butene were stereospecific, demonstrating that the insertion was caused from the singlet excited state of
5a.
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Osamu Soga, Hidetoshi Iwamoto, Yasutaka Ota, Minoru Odoi, Kiyoshi Sait ...
1987 Volume 16 Issue 5 Pages
815-816
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Wasabidienone-E, a new cyclohexadienone derivative containing hydroxyethylamino group, has been isolated from the potato culture solution, and its structure was determined to be 5-(2-hydroxyethylamino)-3-methoxy-2,6-dimethyl-(6R
*)-[(2R
*)-2-methylbutyryloxy]-2,4-cyclohexadien-1-one by spectroscopic analysis and chemical transformation.
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Tadashi Okamoto, Mikio Shimada, Shinzaburo Oka
1987 Volume 16 Issue 5 Pages
817-820
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Oxidation of 1-aminocyclopropanecarboxylic acid by O
2 in the presence of 1-benzyl-3-carbamoyl-1,4-dihydropyridine, Mn(II) ion, and flavin mononucleotide reproduced the biological ethylene forming reaction in plant tissues with respect to products, stereochemistry, and behavior to inhibitors.
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Kazuhiro Maruyama, Fumikazu Kobayashi, Atsuhiro Osuka
1987 Volume 16 Issue 5 Pages
821-824
Published: May 05, 1987
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Salen-capped porphyrin and salen-bridged porphyrin dimer as well as their zinc and nickel complexes were synthesized. In the capped complex, the nickel-salen moiety was rigidly held over the porphyrin ring, while preferred conformations of salen-bridged porphyrin dimers were controlled by the metal complexation.
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Atsuhiro Osuka, Kazuhiro Maruyama
1987 Volume 16 Issue 5 Pages
825-828
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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A twisted and partially overlapping porphyrin dimer bridged by a 1,1′-spirobiindane spacer was synthesized. Its biszinc complex and bismagnesium complex showed a split Soret band, indicating the exciton interaction of the two porphyrin ring. Bismagnesium complex underwent reversible one-electron oxidation 40 mV more easily than the corresponding monomeric porphyrin.
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Rikuhei Tanikaga, Ken Hosoya, Aritsune Kaji
1987 Volume 16 Issue 5 Pages
829-832
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Enantiomerically pure (2
S)-1-arenesulfonyl-2-alkanols (
1) were prepared by yeast reduction of 1-arenesulfonyl-3-chloro-2-propanones, followed by epoxydation and alkylation. Reaction of dianions of
1 with aldehydes occurred at the
Pro (
R) position of C(1) to give 1,3-diols, which were converted to (3
S)-1-alken-3-ols or (2
S,4
S)-4-hydroxy-2-alkenenitriles in 100% e.e.
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Hisao Urata, Hideki Yugari, Takamasa Fuchikami
1987 Volume 16 Issue 5 Pages
833-836
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Palladium-catalyzed reaction of perfluoroalkyl iodides with terminal alkynes or alkenes in alcohols under carbon monoxide pressure in the presence of potassium carbonate directly gives β-perfluoroalkyl-substituted alkenoates or alkanoates, respectively.
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Hideta Ishihara, Takanori Momozaki, Koji Yamada, Tsutomu Okuda
1987 Volume 16 Issue 5 Pages
837-838
Published: May 05, 1987
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Temperature dependence of
121Sb NQR frequencies for 2SbCl
3·
o-xylene showed that a phase transition takes place at about 139 K, whereas the DTA experiment showed no thermal anomaly around the transition temperature.
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Kentaro Takagi, Tadashi Iwachido, Naomi Hayama
1987 Volume 16 Issue 5 Pages
839-840
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Pd(0) catalyzed the reaction of 1-amino-2-iodoarenes with thioamides giving rise to 2-XCH
2-substituted benzothiazoles (X=H, CH
3, OCH
3, and CN) directly.
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Toshio Itahara
1987 Volume 16 Issue 5 Pages
841-844
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Oxidation of thymine and 1,3-dimethylthymine with hydrogen peroxide in hydrochloric acid (pH 1.0–2.2) at 35–38 °C gave the corresponding trans-5-chloro-6-hydroperoxy-5,6-dihydrothymines. The formation of the hydroperoxythymines was dependent on pH of the aqueous solutions. Reaction of the hydroperoxythymine with amino acids and nucleic acids related compounds in deuterium oxide was investigated by NMR spectroscopy.
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Yoshimasa Hoshino, Yasuhiko Yukawa, Akira Endo, Kunio Shimizu, Gen P. ...
1987 Volume 16 Issue 5 Pages
845-848
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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A complete series of ruthenium(III) complexes with two kinds of ligands, acetylacetone and 1,1,1-trifluoro-4-phenyl-2,4-butanedione, was synthesized and isolated chromatographically. The isomers were characterized by means of NMR spectroscopy and X-ray single-crystal analysis. An inductive effect of ligand substituents on the methyne NMR signals is briefly discussed.
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Shizuaki Murata, Toshiyasu Suzuki
1987 Volume 16 Issue 5 Pages
849-852
Published: May 05, 1987
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Benzeneselenenyl triflate is prepared from benzeneselenenyl chloride and silver trifluoromethanesulfonate. It performs selenium-induced cyclization of β,γ-, γ,δ-, and δ,ε-unsaturated carboxylic acids.
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Aoi Ono, Hiroshi Hayakawa
1987 Volume 16 Issue 5 Pages
853-854
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Aromatic aldehydes were more selectively reduced to the corresponding alcohols than the related ketones by a reducing system consisting of NaBH
4 and SnCl
2 in THF in a common flask.
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Hisashi Takahashi, Toshiaki Morimoto, Kazuo Achiwa
1987 Volume 16 Issue 5 Pages
855-858
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Synthesis of new chiral pyrrolidinebisphosphine–rhodium complexes and their application to the asymmetric hydrogenations of α-keto esters and an α-keto acetal are described. Among them, MCCPM-Rh gave the highest optical yield (87%) of the α-hydroxy ester and MCPM-Rh gave the 75% optical yield of the α-hydroxy acetal at the substrate to catalyst ratio (1000:1).
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Toshiyasu Sakakura, Teruyuki Hayashi, Masato Tanaka
1987 Volume 16 Issue 5 Pages
859-862
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Pentane and decane were regioselectively transformed into 1-butene and 1-nonene with the simultaneous formation of acetaldehyde by photocatalysis in the presence of RhCl (CO)(PMe
3)
2 under carbon monoxide.
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Masashi Murakami, Takashi Tsuji, Masafumi Oda, Shinya Nishida
1987 Volume 16 Issue 5 Pages
863-866
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Some methylcyclopropanes activated by a spiro-fused fluorene group were readily dehydrogenated by DDQ, but not by chloranil, to give a butadiene derivative, which reacted further with DDQ to afford 7-(o,o′-biphenylene)-3,4-dichloro-1,6-dicyano-9-alkylbicyclo[4.4.0]deca-3,8-diene-2,4-dione. In contrast, methylcyclopropanes substituted merely by two phenyl groups were reluctant to undergo the dehydrogenation.
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Takashi Shibahara, Atsushi Takeuchi, Takeshi Kunimoto, Hisao Kuroya
1987 Volume 16 Issue 5 Pages
867-870
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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A triangular tungsten(IV) aqua ion with sulfur bridges, W
3O
2S
24+ has been prepared and characterized. X-ray structure analysis of a derivative complex, [W
3O
2S
2(Hnta)
3]
2−(H
3nta = nitrilotriacetic acid) has revealed that its core is of structure of W
3(μ
2-O)
2(μ
2-
S)(μ
3-
S). The electronic spectrum of the aqua ion has an absorption peak at 506 nm (ε = 381 M
−1 cm
−1 per trimer; 1 M = 1 mol dm
−3).
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Masao Ishii, Shigenobu Funahashi, Motoharu Tanaka
1987 Volume 16 Issue 5 Pages
871-874
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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The solvent exchange rates for manganese(II) ion in DMF have been measured at various pressures up to 300 MPa by the high-pressure oxygen-17 NMR line-broadening method. The activation volume of 1.6±0.5 cm
3 mol
−1 points to an interchange mechanism operative in the exchange process. This is discussed in terms of the bulkiness of DMF.
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Shoji Wakabayashi, Hideki Ogawa, Naomi Ueno, Norio Kunieda, Tadakatsu ...
1987 Volume 16 Issue 5 Pages
875-878
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Lithium enolate, derived from alkyl 2-(phenylthio)alkanoate with lithium diisopropylamide, reacted with aldehyde in the presence of diethylaluminum chloride to give alkyl 2-phenylthio-2-alkyl-3-hydroxyalkanoate, which was converted to 2-alkylidene-3-hydroxy-alkanoate via thermolysis of the corresponding sulfoxide. The title compound was synthesized from methyl 2-(phenylthio)hexadecanoate and (R)-(+)-2-tert-butyldimethylsilyloxypropanal by employing the method.
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Shun-Ichi Murahashi, Takeshi Naota, Nobuyuki Nakajima
1987 Volume 16 Issue 5 Pages
879-882
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Acyl cyanides are highly useful reagents for the chemoselective acylation of primary amines in the presence of secondary amines. The reaction provides the versatile method for the short-step synthesis of various naturally occurring polyamines.
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Kazuaki Isomura, Makoto Sakurai, Toshio Komura, Masumi Saruwatari, Hir ...
1987 Volume 16 Issue 5 Pages
883-886
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Thermal reaction of 2H-azirines, bearing a methoxy or methylthio group at the neighboring position to azirine ring, was studied. In thermolysis of ethyl 2-(2-methoxynaphth-1-yl)-2H-azirine-3-carboxylate, attack of the vinyl nitrene at the peri position to form a 1-azaphenalene ring was observed. In thermal reaction of its thio analogue, 1-azaphenalene was also formed, but a naphthothiazine formed by the attack of vinyl nitrene at the sulfur atom was the major product. Mechanisms and differences of the reactions depending on O and S are discussed.
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Hitomi Suzuki, Qui Yi, Junko Inoue, Kumiko Kusume, Takuji Ogawa
1987 Volume 16 Issue 5 Pages
887-890
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Copper(I) iodide-catalyzed reaction of aryl iodides with anion derived from phenylsulfonylacetonitrile in hot hexamethylphosphoric triamide affords α-arylated nitriles in good to moderate yields. Further alkylation of these nitriles followed by reductive removal of sulfonyl group provides a simple route to α-arylalkanenitriles.
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Hitomi Suzuki, Hideki Koide, Yukiko Taki, Eiichi Ohbayashi, Takuji Oga ...
1987 Volume 16 Issue 5 Pages
891-894
Published: May 05, 1987
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Nitration of substituted pentamethylbenzenes has been carried out under various conditions using the title nitrating systems in order to elucidate the peculiar dependence of the modes of side-chain substitution on the reagent employed; nitrooxylation with HNO
3/CH
2Cl
2 and nitration with HNO
3/(CH
3CO)
2O. Based on the evidence obtained from product variations with substituents, electrochemical nitrodecarboxylation of arylacetates, and ESR examination of the initial stage of the side-chain reactions, a proposal is made that the side-chain substitution of polysubstituted arenes occurs via a heterolytic path with HNO
3/CH
2Cl
2 and via a homolytic path with HNO
3/(CH
3CO)
2O.
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Kaoru Fujimoto, Hitoshi Mazaki, Kohji Omata, Hiro-o Tominaga
1987 Volume 16 Issue 5 Pages
895-898
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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In the vapor phase carbonylation of methanol by carbon monoxide on a nickel on active carbon catalyst, co-existence of hydrogen greatly enhanced the rate of acetic acid production but with a slight increase in methane formation.
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Tsutomu Kumagai, Mitsuo Katayose, Toshio Mukai
1987 Volume 16 Issue 5 Pages
899-902
Published: May 05, 1987
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2,8-Dimethoxycarbonyl, 8-methoxycarbonyl, and 2,8-dimethyl derivatives of bicyclo[3.2.1]octa-3,6-diene gave 4-imino-1,4-dihydropyridines and pyrroles under acidic conditions. In addition, the C
6–C
7 dihydro-analogue produced 2-vinylpyrrole by the methyl carbamate elimination.
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Takayuki Suga, Hiroki Hamada, Toshifumi Hirata, Shunsuke Izumi
1987 Volume 16 Issue 5 Pages
903-906
Published: May 05, 1987
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The biotransformation of the enantiomeric pairs of 2- and 3-oxygenated
p-menthane derivatives with the cultured cells of
Nicotiana tabacum was investigated. It was found that (i) the cultured cells transform only 2-oxygenated
p-menthane derivatives to a great extent, (ii) the cultured cells cause the highly stereospecific reduction for (1
R,4
R)-2-oxo-
p-menthane, whereas this is not the case for its enantiomer, and (iii) the cultured cells enantioselectively oxidize the hydroxyl group of 2-hydroxy-
p-menthanes.
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Masaki Hasegawa, Yasunari Maekawa, Satoshi Kato, Kazuhiko Saigo
1987 Volume 16 Issue 5 Pages
907-910
Published: May 05, 1987
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The complex with the composition ranging from 6:4 to 2:8 of ethyl α-cyano-4-[2-(4-pyridyl)ethenyl]cinnamate (
1) and propyl α-cyano-4-[2-(4-pyridyl)ethenyl]cinnamate (
2) photodimerized quantitatively into the three types of tricyclic dimer crystal, indicating a disordered sequence of
1 and
2 in the monomer crystal. The resulted dimers have a highly strained [2.2]paracyclophane unit, which is quite different from the topochemical photoproduct obtained from
1 or
2 alone.
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Shigeo Tazuke, Seiji Kurihara, Tomiki Ikeda
1987 Volume 16 Issue 5 Pages
911-914
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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Over 100 times amplified image recording was achieved by means of reading out nematic isotropic phase transition of liquid crystal induced by partial trans→cis photoisomerization of a small amount(up to 5 mol%) of 4-butyl-4′-methoxyazobenzene mixed with 4-cyano-4′-n-pentylbiphenyl.
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Shin-ichiro Imabayashi, Noboru Kitamura, Koichi Tokuda, Shigeo Tazuke
1987 Volume 16 Issue 5 Pages
915-918
Published: May 05, 1987
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Viologen dimer and trimer model compounds were prepared and their reduced forms(i.e., radical cation) were investigated electrochemically as well as spectroscopically. Intramolecular association between two viologen radical cations takes place efficiently, which brings about changes in the electrode reduction processes of these compounds.
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Tatsuya Shono, Yoshihiro Matsumura, Kenshi Uchida, Katsumi Tagami
1987 Volume 16 Issue 5 Pages
919-922
Published: May 05, 1987
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9-Azabicyclo[4.2.1]nonane skeleton was formed in one step by Lewis acid promoted reaction between 1-methoxycarbony1-2,5-dimethoxypyrrolidine and 1-ethoxy-1-trimethylsiloxy-1,4-pentadiene, and it was converted to (±)-anatoxin a.
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Yoshiki Ozawa, Yukiyoshi Sasaki
1987 Volume 16 Issue 5 Pages
923-926
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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A novel heteropolytungstate salt [(CH
3)
4N]
6[H
3BiW
18O
60] is prepared and its crystal structure is determined : monoclinic, P2
1/c, a=13.986(7) Å, b=15,134(2), c=23.250(8), β=115.32(3)°, Z=2. The anion has the same framework as that found in 18-tungstoarsenate(III)(AsW
18O
60). The Bi atom is coordinated by three O atoms and is on the apex of BiO
3 trigonal pyramid.
View full abstract
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Takehiko Mori, Fumiko Sakai, Gunzi Saito, Hiroo Inokuchi
1987 Volume 16 Issue 5 Pages
927-930
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
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An organic conductor (BEDT-TTF)
3CuBr
3 (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene) crystallizes in the monoclinic space group P2
1/c, a = 16.937(3), b = 10.123(1), c = 14.178(4) Å, β=102.59(2)°, V = 2372.2(9) Å
3, and Z = 2. The donors form a two-dimensional network, in which a charge separation takes place as (D
3⁄4+D
3⁄4+D
0)
2CuBr
2−CuBr
42−. The resistivity at room temperature is 0.6 Ωcm and semiconductive.
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Koichi Kikuchi, Mikio Kikuchi, Takahisa Namiki, Kazuya Saito, Isao Ike ...
1987 Volume 16 Issue 5 Pages
931-932
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
JOURNAL
FREE ACCESS
We discovered a new organic superconductor, (DMET)
2Au(CN)
2, which is a radical salt of an asymmetrical donor. The room-temperature conductivity of this salt was very high (2500 S·cm
−1) at ambient pressure. This salt showed a metal-insulator transition at about 25 K at ambient pressure, but it exhibited superconductivity below 0.80 K at 5 kbar.
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Masahiko Tachibana, Shozo Tero-Kubota, Masamoto Iwaizumi
1987 Volume 16 Issue 5 Pages
933-936
Published: May 05, 1987
Released on J-STAGE: March 27, 2006
JOURNAL
FREE ACCESS
1,4-Dihydroxyanthraquinone, a model compound for Adriamycin, is reduced by Fe
2+-ADP complex to generate semiquinone, while by Fe
2+-phosphate complex to hydroquinone. The difference is explained in terms of the higher redox potential of the latter reducing agent. Similar reduction reactions were observed in the case of the drug.
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