-
Kenichi Somekawa, Hideshi Oda, Tetsuro Shimo
1991 Volume 20 Issue 12 Pages
2077-2078
Published: 1991
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Sensitized photoreaction of 3-(5-ethoxycarbonyl-4-pentynyloxy)-2-pyridone gave a [2+2]cycloadduct across 3,4-bond of the 2-pyridone. The adduct was thermally derived to a new tricyclic β-lactam.
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Kozo Toyota, Katsuya Tashiro, Masaaki Yoshifuji
1991 Volume 20 Issue 12 Pages
2079-2082
Published: 1991
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(
E,
E)-3,4-Bis(2,4,6-tri-
t-butylphenylphosphinidene)-1,2-bis(trimethylsilyl)cyclobutene was allowed to react with the group-6 metal(0) carbonyls to give stable tetracarbonyl complexes of chelate type, where the metal is chromium, molybdenum, and tungsten.
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Takashi Sagawa, Hitoshi Ishida, Kenji Urabe, Katsutoshi Ohkubo
1991 Volume 20 Issue 12 Pages
2083-2086
Published: 1991
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Stereoselective dioxygenolyses of the pyrrole ring in
N-acetyl-
L(+)- and
D(−)-tryptophan methyl esters have been performed with a manganese porphyrin covalently bound to bovine serum albumin; the enantioselective ratio has achieved to 1.63 (k
L/k
D) in 18 vol% THF/H
2O (pH 9.3) under an O
2 atmosphere at 298 K.
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Shigeru Toyama, Asao Nakamura, Akihiko Ueno, Fujio Toda
1991 Volume 20 Issue 12 Pages
2087-2090
Published: 1991
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The current through the bilayer lipid membrane (BLM) formed from glyceryl-1-monoolein (GMO) and spirobenzopyran with a long alkyl chain
(1) increased upon UV light irradiation and decreased upon subsequent irradiation of visible light during the voltage application. This photoinduced increase in the current suggests that defects in BLM are formed as pass ways for ions associated with the conformational change of
1.
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Toshikazu Takata, Hideo Matsuoka, Takeshi Endo
1991 Volume 20 Issue 12 Pages
2091-2094
Published: 1991
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Hiroyuki Sugimoto, Hiroyuki Aota, Akira Harada, Yotaro Morishima, Miki ...
1991 Volume 20 Issue 12 Pages
2095-2098
Published: 1991
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The temperature dependence of the magnetic susceptibilities for 4-methacryloyloxy- and 4-acryloyloxy-2,2,6,6-tetramethylpiperidin-1-oxyl (MOTMP and AOTMP, respectively) was measured. Intermolecular magnetic coupling in these radicals was changed from antiferromagnetic to ferromagnetic by substituting hydrogen at α-position with a methyl group. A magnetic phase transition for MOTMP was observed at 0.14 K in the measurement of the temperature dependence of heat capacity. The circumstantial evidences support that the ordered state is of ferromagnet.
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Shinjiro Matsuoka, Kiichi Yamamoto, Chyongjin Pac, Shozo Yanagida
1991 Volume 20 Issue 12 Pages
2099-2100
Published: 1991
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Efficient
p-terphenyl-catalyzed photoreduction of CO
2 to carbon monoxide can be achieved by combination with Cobalt
3+–cyclam (cyclam = 1,4,8,11-tetra-azacyclotetradecane) as an electron mediator in organic solvent.
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Yoshito Oshima, Kayoko Iguchi, Hiro-o Tominaga, Seiichiro Koda
1991 Volume 20 Issue 12 Pages
2101-2104
Published: 1991
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The laser-induced photochlorination of 1,1-dichloroethane followed by its dehydrochlorination has been examined in a flow reactor under normal pressure at 25–200 °C, which has been proved to be a novel direct synthesis of vinylidene chloride.
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Isao Yoshida, Nobuhiro Yamamoto, Fumio Sagara, Keihei Ueno, Daido Ishi ...
1991 Volume 20 Issue 12 Pages
2105-2108
Published: 1991
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Calix[4]arene-5,11,17,23-tetrasulfonate (
1) reacts with cerium(III) ion in alkaline solution to form a colored complex (λ
max = 417 nm, ε = 1.09 × 10
4 1 mol
−1 cm
−1). The max coloration reaction is specific for cerium among rare-earth elements. The coloration mechanism was discussed on the basis of the stability constants.
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Hideki Masuda, Jia-dan Zhang, Nobuyoshi Baba
1991 Volume 20 Issue 12 Pages
2109-2112
Published: 1991
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A thin metal Ag film was obtained at an air/solution interface by using a spread stearic acid layer as a supporting substrate of electroless plating. The properties of the film and the condition of the electroless plating of Ag was examined with scanning electron microscopy and in situ reflectance spectroscopy.
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Hideyuki Tagaya, Tohru Hashimoto, Masa Karasu, Taeko Izumi, Koji Chiba
1991 Volume 20 Issue 12 Pages
2113-2116
Published: 1991
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Non electron donors were intercalated into MoS
2 layers by a method of exfoliation followed by its restacking. Interlayer spacings of substituted ferrocene intercalates indicate the formation of a bilayer of guest molecules, whereas, aromatic compounds are included with an orientation of the ring plane perpendicular to the host layers.
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Junji Inanaga, Shino Sakai, Yuichi Handa, Masaru Yamaguchi, Yasuo Yoko ...
1991 Volume 20 Issue 12 Pages
2117-2118
Published: 1991
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α,β-Unsaturated esters and amides were rapidly and selectively reduced to the corresponding saturated ones under mild conditions without affecting coexisting isolated double or triple bonds by using the reduction system, SmI
2-
N,
N-dimethylacetamide (DMA)-proton source.
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Yoshihiro Mizukami, Hiroshi Nakatsuji, Masahiko Hada, Muneo Sasaki, Na ...
1991 Volume 20 Issue 12 Pages
2119-2122
Published: 1991
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Ab initio molecular orbital (MO) calculations are performed for the model molecule of ribozyme. For the models of initial and transition states of splicing reaction, stable binding sites of the Mg
2+ ion are investigated. The energetics of the reaction and the effect of hydration on the Mg
2+ ion are discussed.
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Makoto Komiyama, Masami Kobayashi, Makoto Harada
1991 Volume 20 Issue 12 Pages
2123-2126
Published: 1991
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By use of pheophorbide a as sensitizer, DNA has been efficiently cleaved on visible light irradiation either in the presence or the absence of molecular oxygen. The possibility of DNA scission by pheophorbide a in photodynamic cancer therapy is indicated.
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Yuji Mizuho, Noriko Kasuga, Sanshiro Komiya
1991 Volume 20 Issue 12 Pages
2127-2130
Published: 1991
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Carbon-hydrogen bond oxidative addition of alkyl cyanoacetate to Ru(C
2H
4)(PPh
3)
3 in benzene at room temperature gives mer-RuH(NCCHCOOR)(NCCH
2COOR)(PPh
3)
3 (R = Me, Et) accompanied by the liberation of ethylene. X-Ray structure analysis of the THF adduct (R = Me) reveals that NCCHCOOMe group bonds to ruthenium not through the methine carbon but the cyano group. These complexes react with benzaldehyde and methyl iodide to give alkyl (
E)-1-cyanocinnamate and alkyl 2-cyanopropionate, respectively.
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Tadashi Mizutani, Ruka Nakashima
1991 Volume 20 Issue 12 Pages
2131-2134
Published: 1991
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The values of rotational strength for β,γ-unsaturated ketones arising from the coupling between n-π
* and π-π
* transitions were calculated based on a non-empirical molecular orbital method and the results were compared with the experimentally observed values.
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Yoshitsugu Arai, Tohru Kontani, Toru Koizumi
1991 Volume 20 Issue 12 Pages
2135-2138
Published: 1991
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A new approach to a diastereoselective cationic cyclization by stereocontrol due to the bicyclo[2.2.1]heptene moiety in a chiral γ-hydroxy lactam is described. The diastereoselective reaction followed by Diels–Alder cycloreversion has been successfully applied to a chiral synthesis of (+)-indolizidine and (+)-laburnine (=trachelanthamidine).
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Yoshio Hisaeda, Takeshi Ihara, Teruhisa Ohno, Yukito Murakami
1991 Volume 20 Issue 12 Pages
2139-2142
Published: 1991
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The absolute configuration of an iron(III) complex of
N,
N′,
N″-tris[
N-(4-ditetradecylcarbamoy1-2,3-dihydroxybenzoyl)alanyl]-2,11,20-triaza[3.3.3]paracyclophane, an enterobactin model, was subjected to change by the chirality of the alanine residues; the
L-alanine residue prefers to give out the Λ-configuration, while the
D-residue stabilizes the Δ-configuration.
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Takuzo Funabiki, Hiroyuki Kojima, Masatoshi Kaneko, Takahiro Inoue, To ...
1991 Volume 20 Issue 12 Pages
2143-2146
Published: 1991
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Five-coordinated catecholato(pyridine)iron complexes were isolated from the THF solution of the iron complex used for the catecholdioxygenase model reaction. Formation and structure of species with a catecholate ligand having a strong radical character in the pyridine solution were shown spectroscopically, especially by the large down-field shift of the methyl resonance of 4-methylcatecholate complex in
2H NMR and by the large band at >1000 nm in electronic spectra. Effect of Et
4NCl on the spectra indicated that the complexes are in equilibrium with the the chloride-pyridine ligand exchange.
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Hiroyasu Shimizu, Koji Iwamoto, Kiyoshi Fujimoto, Seiji Shinkai
1991 Volume 20 Issue 12 Pages
2147-2150
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A chromogenic calix[4]arene which has within a molecule both the triester moiety as a metal-binding site and the azophenol moiety as a coloration site was synthesized. This calix[4]arene showed the high Li
+ selectivity.
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Ermitas Alcalde, Tomás Roca, Jean Pierre Fayet, Marie Claire Ve ...
1991 Volume 20 Issue 12 Pages
2151-2154
Published: 1991
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The first synthesis and characterization of several examples of the title compounds is described. Their physicochemical properties are discussed on the basis of the
1H NMR data and the large experimental dipole moments 11.66 to 13.0 Debye. Furthermore, all the experimental results for (
E)-1-alkyl-[2-(azolyl-2-idene)-etylidene]-dihydropyridines (
A↔
B) favour the dipolar structure (
B).
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Toshio Enokida, Ryo Hirohashi
1991 Volume 20 Issue 12 Pages
2155-2158
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A new crystal named ε-form nickel phthalocyanine(NiPc), has been synthesized from NiCl
2 and phthalonitrile by using 1,8-diaza-bicyclo(5,4,0)undecene-7(DBU) in 2-butoxyethanol at 100 °C. The X-ray powder diffraction pattern of ε-NiPc was distinguishable from other polymorphs. The IR and electronic absorption spectra suggest that this ε-NiPc forms a new crystal phase of an intermediate atate.
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Manabu Uchida, Masahiro Irie
1991 Volume 20 Issue 12 Pages
2159-2162
Published: 1991
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A vinylnaphthol derivative with a thiophene ring at α-position of the vinyl group underwent photochromic reaction in nonpolor solvents. The structure of the colored form, which was isolated by HPLC, was assigned to a closed-ring naphthopyran.
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Akiko Kobayashi, Hayao Kobayashi, Akihito Miyamoto, Reizo Kato, R. A. ...
1991 Volume 20 Issue 12 Pages
2163-2166
Published: 1991
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High-pressure resistivity studies on [(CH
3)
4N][Pd(dmit)
2]
2 have revealed the system to be a new molecular superconductor. The superconducting transition has been observed above 6 kbar. The mid-point transition temperature T is 6.2 K at 6.5 kbar. The crystal has the structure almost isomorphous to the high-pressure superconductor, [(CH
3)
4N][Ni(dmit)
2]
2.
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Eisaku Nomura, Hisaji Taniguchi, Kouichi Kawaguchi, Yoshio Otsuji
1991 Volume 20 Issue 12 Pages
2167-2170
Published: 1991
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5,11,17,23,29,35-Hexa-p-tert-butyl-37,38,39,40,41,42-hexakis(3,6,9-trioxadecyloxy)calix[6]arene efficiently catatalyzes the reaction of alkyl halides with alkali metal carboxylates to produce esters.
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Takashi Yamazaki, Jiro Haga, Tomoya Kitazume, Shinichiro Nakamura
1991 Volume 20 Issue 12 Pages
2171-2174
Published: 1991
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Michael addition reactions of lithium enolates derived from ketones, esters, and amides to ethyl 3-trifluoromethylacrylate were found to proceed smoothly in moderate to excellent chemical yields as well as with a high degree of diastereoselectivity at the newly formed carbon–carbon bond.
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Takashi Yamazaki, Jiro Haga, Tomoya Kitazume
1991 Volume 20 Issue 12 Pages
2175-2178
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Michael addition reactions of acyl oxazolidinones to ethyl 3-trifluoromethylacrylate were found to proceed smoothly with a high degree of diastereo- as well as diastereofacial selectivity at the new carbon–carbon bond.
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Hideaki Hamada, Yoshiaki Kintaichi, Mitsunori Tabata, Motoi Sasaki, Ta ...
1991 Volume 20 Issue 12 Pages
2179-2182
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The effect of pretreatment with sulfuric acid on several metal oxide catalysts for the title reaction was investigated. TiO
2, ZrO
2, and Fe
2O
3 Pretreated with sulfuric acid showed high activity, whereas the activity of Al
2O
3 was decreased by the treatment.
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Akira Sekiya, Shigeru Kurosawa, Toshiro Yamada
1991 Volume 20 Issue 12 Pages
2183-2186
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The geminal-difluoro hydrofluorocarbons (HFCs) were fluorinated by the use of cobalt trifluoride (CoF
3). Regioselective monofluorination of geminal-difluoro compound was achieved on methylene position neighboring gem-difluoromethylene group, and trifluoro compounds were obtained in good yields under mild conditions.
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Shu Kobayashi
1991 Volume 20 Issue 12 Pages
2187-2190
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Silyl enol ethers smoothly react with commercial formaldehyde solution to give the corresponding hydroxymethylated adducts in high yields by the promotion of a catalytic amount of ytterbium(III) triflate (Yb(OTf)
3), which is a stable Lewis acid in aqueous media. Other lanthanide triflates are also found to be effective.
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Tatsuya Shono, Naoki Kise, Nobutaka Kunimi, Ryoji Nomura
1991 Volume 20 Issue 12 Pages
2191-2194
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Electroreduction of aromatic imines in the presence of electrophiles gave the corresponding inter- and intramolecular coupling products when the reaction was carried out with the use of chlorotrimethylsilane (CTMS) as the trapping agent of an anion intermediate.
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Tsugio Kitamura, Shin-ichi Soda, Ichizo Nakamura, Tetsuro Fukuda, Hiro ...
1991 Volume 20 Issue 12 Pages
2195-2198
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Intramolecular and intermolecular ipso substitutions of arylvinyl cations, i.e., α-[
p-(2-hydroxyethoxy)phenyl]vinyl cations and α-(
p-methoxyphenyl)vinyl cations, were studied with respect to the effect of the β substituent and phenyl group as the β substituent was found to exert a significant influence on the ipso substitution.
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Xian-yong Wei, Eisuke Ogata, Etsuo Niki
1991 Volume 20 Issue 12 Pages
2199-2202
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Reactions of di(1-naphthyl)methane (DNM) over Fe and FeS
2 at 300 °C were carried out to investigate the catalytic activities and selectivities of the two catalysts. Both catalysts showed high activities for the reaction of DNM but Fe catalyzed DNM hydrogenation whereas FeS
2 catalyzed DNM hydrocracking. This difference can be ascribed to the presence of sulfur.
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Toshio Itahara, Akihiro Nishino
1991 Volume 20 Issue 12 Pages
2203-2204
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Oxidation of 5-bromo-1,3-dimethyluracil by KHSO
5 gave 5,5-dibromo-6-hydroxy- and 5,5,6-trihydroxy-1,3-dimethyl-5,6-dihydrouracils and that of 5-fluoro-1,3-dimethyluracil by Na
2S
2O
8 gave a 6,6′-dimeric product.
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Yukihiro Yokoyama, Terutake Koizumi, Osamu Kikuchi
1991 Volume 20 Issue 12 Pages
2205-2208
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The NMR spectra of stilbene dianion have been observed in solution. The dianions derived from
cis- and
trans-stilbene are identical and only one species exists in solution even at −70 °C. From the vicinal coupling constant
3Jαα′, it is concluded that the configuration around the central bond C
α–C
α′ of the dianions is not fixed at the trans-form but the rotation about the bond occurs.
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Ken’ichi Takeuchi, Yasushi Ohga, Motohiro Munakata, Toshikazu Ki ...
1991 Volume 20 Issue 12 Pages
2209-2212
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The
Z/
E rate ratio in the trifluoroethanolysis at 25 °C of the title chlorides and mesylates are 1023 and 126, respectively, showing the greater front strain (F-strain) effect in the (
Z)-chloride than in the (
Z)-mesylate. The results were supported by MM2 and AM1 calculations.
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Kozo Toyota, Yasuhisa Ishikawa, Masaaki Yoshifuji, Kengo Okada, Keiji ...
1991 Volume 20 Issue 12 Pages
2213-2216
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A phosphorus-containing novel heterocyclic compound,
trans-3,5-bis(2,4,6-tri-
t-butylphenyl)-1,2,3,5-dithiadiphospholane 3,5-disulfide (
trans-
1), was isolated in the reaction of 1,3-bis(2,4,6-tri-
t-butylphenyl)-1,3-diphosphaallene with sulfur and the structure of
trans-
1 was confirmed by the X-ray crystallography. Desulfurization of
trans-
1 afforded the corresponding
trans-1,2,4-thiadiphosphetane 2,4-disulfide.
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Hideji Itokawa, Hiroshi Morita, Koichi Takeya, Nobuo Tomioka, Akiko It ...
1991 Volume 20 Issue 12 Pages
2217-2220
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RAI-III and VI, conformational isomers of antitumor bicyclic hexapeptides, RA-III and VI, respectively, were isolated from
Rubia cordifolia. By the conformational analysis of them using spectroscopic and computational chemical methods, they were shown to have γ-turn structures at residues 2,3, and 4, which were stabilized by a hydrogen bond between Ser-2-OH and D-Ala-1-CO.
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Hideji Itokawa, Etsuko Kishi, Hiroshi Morita, Koichi Takeya, Yoichi Ii ...
1991 Volume 20 Issue 12 Pages
2221-2222
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A new squalene-type triterpene with cytostatic activity, named as longilene peroxide, was isolated from the woods of
Eurycoma longifolia. The solution and solid forms were elucidated by spectroscopic and X-ray analysis.
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Kazuhiko Hashimoto, Ken-ichi Mori, Masahiko Okada
1991 Volume 20 Issue 12 Pages
2223-2226
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New optically active lactams having a bicyclo[3.2.1]octene or -octane skeleton were synthesized from
D-glucuronic acid. The key step is an intramolecular cyclization of
N-(p-methoxybenzyl)-1,2,3,4-tetra-
O-acetyl-
D-glucuronamide with simultaneous elimination of acetic acid molecules.
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Itaru Hamachi, Hidetoshi Fujimura, Toyoki Kunitake
1991 Volume 20 Issue 12 Pages
2227-2230
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Myoglobin, dioxygen storage protein, was effectively entrapped without denaturation in a multilayered, two-dimensional polymer network that was prepared by using a cast film of a phosphate bilayer membrane as molecular template. The spatial orientation of Mb observed in the presence of the bilayer matrix was lost by its solvent extraction.
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Hirpshi Yokoi, Takayuki Tsutsui, Yasuyoshi Mori, Tsuyoshi Mitani
1991 Volume 20 Issue 12 Pages
2231-2232
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The removal of various mono-, di-, oligo-, and poly-saccharides from aqueous solutions by adsorptive binding to precipitated iron(III) hydroxide was very selective in respect of their stereo-chemistry and chain length.
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Toshiaki Kabe, Atsushi Ishihara, Masatoshi Nomura, Tetsuro Itoh, Pingy ...
1991 Volume 20 Issue 12 Pages
2233-2236
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Solvent effects on hydrodesulfurization of benzothiophene (BT) and dibenzothiophene (DBT) catalyzed by Co–Mo/Al
2O
3 were investigated under deep desulfurization conditions by using Langmuir-Hinshelwood (L–H) rate law. Solvents affected heats of adsorption of thiophenes rather than activation energy of HDS. Activation energies of HDS and heats of adsorption of thiophenes and solvents were estimated from the kinetic data.
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Tatsumi Ishihara, Takanori Fujita, Yukako Mizuhara, Yusaku Takita
1991 Volume 20 Issue 12 Pages
2237-2240
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The catalytic reduction of CO
2 to carbon with hydrogen was studied on the oxide catalysts for the fixation of carbon dioxide. Carbon dioxide was reduced to carbon and carbon monoxide selectively on the oxide catalysts. The catalyst, WO
3, is highly active for reducing carbon dioxide to carbon.
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Akiya Ogawa, Noriaki Takami, Masahito Sekiguchi, Hiroshi Yokoyama, Hit ...
1991 Volume 20 Issue 12 Pages
2241-2242
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When diphenyl diselenide is heated at 150–180 °C in the presence of acetylenes, an acetylene insertion reaction into the Se–Se bond of the diselenide takes place to provide
vic-bis(phenylseleno)alkenes in moderate to high yields.
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