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Renji Okazaki, Masaki Takahashi, Naoki Inamoto, Tadashi Sugawara, Hiiz ...
1989 Volume 18 Issue 12 Pages
2083-2086
Published: 1989
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Photoreaction of the title compound at cryogenic temperatures produced a highly reactive 2,4-di-
t-butyl-6-cyanothionitrosobenzene which showed a visible absorption around 470 nm.
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Masaki Takahashi, Renji Okazaki, Naoki Inamoto
1989 Volume 18 Issue 12 Pages
2087-2090
Published: 1989
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A transient thionitrosoarene was trapped by an azide, diazo compound, oxygen, and thiirane to give a sulfur diimide, thiocarbonylimine,
N-sulfinylaniline, and
N-thiosulfinylaniline, respectively. In the reaction with oxygen
N-sulfonylaniline was also formed and underwent a novel type of intramolecular cyclization.
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Kenji Takehara, Hiroyuki Niino, Yasuhiko Oozono, Kazuaki Isomura, Hiro ...
1989 Volume 18 Issue 12 Pages
2091-2094
Published: 1989
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Among the all types of amphiphilic carboxylic acids, having phenylpyrazine as the chromophore and alkyl or alkoxy group as the hydrophobic part, 5-(4′-alkoxyphenyl)pyrazine-2-carboxylic acid formed the most stable and closely packed monolayer, which could be easily deposited to form a Y-type Langmuir–Blodgett film.
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Yasuzo Sakai, Hiroyuki Kumakura, Fujio Takahashi
1989 Volume 18 Issue 12 Pages
2095-2098
Published: 1989
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A novel method with using liquid membrane containing ferromagnetic powder (LM-FP) under rotating magnetic field was proposed for the control of molecular transport rate through the liquid membrane. The rate of phenylglyoxylic acid transport through the LM-FP, (toluene-chloroform mixture containing magnetite powder) increased more than 10 times as compared with the transport rate under non-magnetic field.
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Katsuhiro Saito, Tetsuya Watanabe, Kensuke Takahashi
1989 Volume 18 Issue 12 Pages
2099-2102
Published: 1989
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Reactions of tropone derivatives and 8,8-dicyanoheptafulvene with a tautomeric mixture of cycloheptatrienylidene and 1,2,4,6-cycloheptatetraene afforded [4+2]-type cycloadducts.
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Wataru Ueda, Toshio Isozaki, Yutaka Morikawa, John M. Thomas
1989 Volume 18 Issue 12 Pages
2103-2106
Published: 1989
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The lithium and sodium salts of four distinct types of complex bismuth oxychlorides having different structural layer units within the Sillenite family of solids have been employed as catalysts for the selective oxidation of methane. The catalytic performance strongly depends on the environment of chloride ion in the structure; and it is likely that a radical mechanism operates.
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Shuji Aonuma, Koichi Komatsu, Ken’ichi Takeuchi
1989 Volume 18 Issue 12 Pages
2107-2110
Published: 1989
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The energy barriers for the cycloheptatriene ring inversion of the titled compounds were determined by dynamic NMR method. It was clarified that annelation with three rigid bicyclooctene units brings about much less steric destabilization to the planar form of the ring as compared with substitution with six methyl groups. This result was supported by molecular mechanics calculations.
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Ryu Sato, Akira Onodera, Takehiko Goto, Minoru Saito
1989 Volume 18 Issue 12 Pages
2111-2114
Published: 1989
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Some unsymmetrical 1,2,5-benzotrithiepins were synthesized in moderate to good yields by the novel reactions of various olefins with benzopentathiepin (BPT) in the presence of a Lewis acid, trifluoroborane etherate. In this reaction, BPT was found to serve as a 1,5-dipole synthon.
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Michihiko Noguchi, Kenji Doi, Yasutoshi Kiriki, Shoji Kajigaeshi
1989 Volume 18 Issue 12 Pages
2115-2116
Published: 1989
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Perhydro-5,6-di(methylene)-2,4-dioxopyrimidine derivative, a useful intermediate for the synthesis of some fused pyrimidines, was characterized as the [4+2] cycloadduct to
N-methylmaleimide.
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Kazuhiro Maruyama, Hiroshi Imahori, Yoshiki Ozawa
1989 Volume 18 Issue 12 Pages
2117-2118
Published: 1989
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Photochemical reaction of 2,3-dichloro-1,4-naphthoquinone with 1,1-diphenylcyclopropane gave a spirofuran adduct as the sole photoproduct.
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Atsunori Mori, Yoshitaka Ikeda, Koichi Kinoshita, Shohei Inoue
1989 Volume 18 Issue 12 Pages
2119-2122
Published: 1989
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Asymmetric addition of hydrogen cyanide to various aldehydes in the presence of a catalytic amount of cyclo-((
S)-leucyl-(
S)-histidyl) affords the corresponding cyanohydrins in moderate to good optical yields. The reaction of benzaldehyde with hydrogen cyanide gives (
S)-2-hydroxy-2-phenylacetonitrile (85%, 55% ee) whose stereochemistry is found to be opposite to our previous result using cyclo-((
S)-phenylalanyl-(
S)-histidyl).
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Masatoshi Takagi, Keiji Yamamoto
1989 Volume 18 Issue 12 Pages
2123-2124
Published: 1989
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Methyl sodiocarbamate, a recalcitrant nucleophile toward π-allylpalladium intermediate, was found to react with allylic acetates to give allylic carbamates in the presence of a catalytic amount of Pd(PPh
3)
4 in THF-DMSO mixed solvent.
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Toshifumi Miyazawa, Tomoko Donkai, Takashi Yamada, Shigeru Kuwata
1989 Volume 18 Issue 12 Pages
2125-2128
Published: 1989
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In segment couplings by the mixed anhydride and related methods, the addition of copper(II) chloride suppressed racemization completely in the same manner as in the carbodiimide method.
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Yukinori Minagawa, Fumikazu Yajima
1989 Volume 18 Issue 12 Pages
2129-2132
Published: 1989
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Stability of strongly acidic rare earth (III) oxalate aqueous solutions was studied as a function of concentrations of oxalic acid, nitric acid, and rare earth (III) nitrate, RE(NO
3)
3, at 30 °C. Induction period, I
d for precipitation of rare earth oxalate was given by I
d = k
RE [HNO
3]
T6 [RE(NO
3)
3]
T−2 [H
2C
2O
4]
T−3, where subscript T indicates the total concentration and k
RE is constant for rare earth metal ion. k
RE values for Ce, Pr, Nd, Sm, Gd, Dy, Ho, Er, Yb, and Y were evaluated as 110, 14, 6.2, 2.5, 2.3, 4.8, 6.6, 13, 23, and 16/(10
−6 sM), respectively. These results can be well explained by the simple precipitation theory based on solubility products of rare earth (III) oxalates.
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Atsuhiro Osuka, Kazutaka Ida, Toshi Nagata, Kazuhiro Maruyama, Iwao Ya ...
1989 Volume 18 Issue 12 Pages
2133-2136
Published: 1989
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Unsymmetrically quinone-substituted porphyrin dimers were synthesized. The fluorescence of the both porphyrins in these models was effectively quenched by the attached quinone.
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Tasuku Murakami, Kunio Ise, Minato Hayakawa, Shigeru Kamei, Sei-ichi T ...
1989 Volume 18 Issue 12 Pages
2137-2140
Published: 1989
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Equilibria between several metal ions and mugineic acids, phytosiderophores in gramineous plants, were potentiometrically investigated in aqueous solutions and the stabilities of the complex species formed were determined. Only iron(III) formed very stable species with the quadrivalent anions of mugineic acids, and their stability constants were estimated to be 10
32.5∼10
33.3.
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Giovanni Fronza, Claudio Fuganti, Giuseppe Pedrocchi-Fantoni, Stefano ...
1989 Volume 18 Issue 12 Pages
2141-2144
Published: 1989
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Baker’s yeast fermenting on D-glucose, produces from benzyl mercaptan (
R)-
S-benzyl-thioglycerate, converted into (
S)-2,2-dimethyl-1,3-dioxolane-4-methanol of 98.6–99% ee.
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Yukihiro Namba, Toshiyuki Sakakibara, Mikio Masada, Fumiaki Ito, Naoto ...
1989 Volume 18 Issue 12 Pages
2145-2148
Published: 1989
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More liposomes containing 1-
O-palmityl-D-glucuronic acid (PGA), a synthetic glycolipid, bound to macrophages than those containing phosphatidylglycerol did in vitro; however, PGA-liposomes circulated longer in vivo. PGA-liposomes did not aggregate in the presence of serum, but liposomes containing 1-
O-palmityl-D-glucose or myristic acid aggregated rapidly, suggesting that both carbohydrate and carboxyl group of PGA are important for preventing liposomal aggregation in serum. This low agglutinative character may be one of the factors for long circulation of PGA-liposomes in vivo.
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Hisahiro Hagiwara, Tsutomu Akama, Akihiro Okano, Hisashi Uda
1989 Volume 18 Issue 12 Pages
2149-2152
Published: 1989
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Acrylates having a chiral auxiliary react with the trimethylsilyl enol ether of 1-acetylcyclohexene in the presence of Et
2AlCl to give 4-substituted 1-decalones with 0–70% diastereoselectivity. The absolute stereostructure of the decalones have been determined by applying the exciton chirality method to the dibenzoate derivative.
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Yuichi Shimizu, Shun’ichi Sugimoto, Shunichi Kawanishi, Nobutake ...
1989 Volume 18 Issue 12 Pages
2153-2154
Published: 1989
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Ethylene glycol was highly selectively synthesized in high quantum yield by KrF-laser irradiation of the N
2-saturated methanol containing hydrogen peroxide.
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Hiromi Tobita, Yasuro Kawano, Hiroshi Ogino
1989 Volume 18 Issue 12 Pages
2155-2158
Published: 1989
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Replacement of a hydrogen on the silylene bridge of [Cp
2Fe
2(CO)
2(μ-CO)(μ-SiHBu
t)] (Cp = η
5-C
5H
5) by a bulkier group (Cl, Br, I, or Me) caused the proportion of the
trans isomer to increase from 0 to 7–38%. Dynamic
1H NMR study for the methyl derivative revealed that the ΔG
‡362 K values of the process
cis isomer →
trans isomer and of the reversed process were 83.1 ± 1.0 and 81.7 ± 1.0 kJ mol
−1, respectively.
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Kanji Sakata, Toyoki Kunitake
1989 Volume 18 Issue 12 Pages
2159-2162
Published: 1989
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Cross-linked siloxane polymers were prepared by alkali treatment of composite films of CH
3Si(OCH
3)
3 and bilayer-forming amphiphiles. Dissolution of the bilayer matrices gave flexible, free-standing films with varied fine structures.
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Yasunori Kitano, Sentaro Okamoto, Fumie Sato
1989 Volume 18 Issue 12 Pages
2163-2164
Published: 1989
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A new method for the synthesis of (
R)-4-
t-butyldimethylsiloxy-2-cyclopentenone (
1,
R =
t-BuMe
2-Si) has been developed which involves the effective preparation of the chiral (
Z)-γ-iodo allylic alcohol and its conversion into
1 via cycliacylation reaction.
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Toshiaki Mori, Kenzi Suzuki
1989 Volume 18 Issue 12 Pages
2165-2168
Published: 1989
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In
m-xylene conversion on alumina-pillared montmorillonite, the selectivity of disproportionation increased with increasing lateral distance, while isomerization was predominant for the small lateral distance. The observed results suggest that the shape selectivity operates in the reaction.
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Koichi Narasaka, Norikazu Miyoshi, Kazunori Iwakura, Tatsuo Okauchi
1989 Volume 18 Issue 12 Pages
2169-2172
Published: 1989
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Intermolecular addition reactions of radical species generated from β-keto carboxylic acids to olefinic compounds such as a silyl enol ether, a ketene dithioacetal and an enamine proceed selectively by the use of manganese(III) tris(2-pyridinecarboxylate) as an oxidant.
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Young-Chul Kim, Wataru Ueda, Yoshihiko Moro-oka
1989 Volume 18 Issue 12 Pages
2173-2176
Published: 1989
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Catalytic ammoxidation of propane to acrylonitrile proceeds selectively over multicomponent metal oxides containing both bismuth and molybdenum with scheelite related structures. Higher selectivity to acrylonitrile and higher space time yield are obtained at reaction temperatures higher than 500 °C and higher concentration of propane (>40%) in the feed gas.
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Shunichi Fukuzumi, Toshiaki Kitano, Kunio Mochida
1989 Volume 18 Issue 12 Pages
2177-2180
Published: 1989
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Photoinduced hydride reduction of an NAD
+ analogue, 10-methylacridinium ion with permethylpolysilanes [Me
3SiSiMe
3, Me(SiMe
2)Me, (Me
2Si)
6] acting as electron sources and water as a proton source occurs efficiently in acetonitrile under irradiation of visible light (λ > 360 nm) to yield 9,10-dihydro-10-methylacridine selectively.
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Shinzo Kagabu, Tatsuo Inoue
1989 Volume 18 Issue 12 Pages
2181-2182
Published: 1989
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Benzocyclopropene reacted with methane- and n-butanesulfonyl isocyanates at room temperature, and arenesulfonyl isocyanates at 60 °C to afford the corresponding
N-sulfonylphthalimidines.
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Hisashi Watabu, Munemasa Ohkubo, Hiroshi Matsubara, Takashi Sakai, Sad ...
1989 Volume 18 Issue 12 Pages
2183-2184
Published: 1989
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Reduction of 2-methyl-3-oxoalkanoic acids, RC(=O)CH(CH
3)CO
2H (R =
n-C
4H
9 –
n-C
8H
17), gave the corresponding (2
R,3
R)-
anti-3-hydroxy-2-methylalkanoic acids by use of bakers’ yeast with >98% ee and >98% de.
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Hubert Mimoun, Alain Robine, Serge Bonnaudet, Charles J. Cameron
1989 Volume 18 Issue 12 Pages
2185-2188
Published: 1989
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When mixtures of methane, ethane and oxygen are cofed over oxidative coupling of methane catalysts, oxygen is preferentially consumed for the oxidative dehydrogenation of ethane, resulting in low methane conversions and high carbon monoxide production. If, however, ethane is added to the post-oxidation zone of the reactor, methane conversion remains high and the calories generated from this exothermic reaction can be used for the endothermic pyrolysis of ethane to form ethylene plus hydrogen.
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Masashi Ishikawa, Shunichi Fukuzumi, Kumiko Tanii
1989 Volume 18 Issue 12 Pages
2189-2192
Published: 1989
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Irradiation of a yellowish flavin analogue, riboflavin-2′,3′,4′,5′-tetra-acetate (Fl) in a polymer matrix film as well as in acetonitrile containing benzenethiol derivatives and a base with visible light (λ > 360 nm) results in the decrease in absorbance due to Fl (λ
max 442 nm). The color reverts to yellow by irradiation of the samples with ultraviolet light (λ < 360 nm).
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Tadashi Okuyama, Takayuki Fueno
1989 Volume 18 Issue 12 Pages
2193-2196
Published: 1989
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Acid-catalyzed hydrolysis of methoxymethyl benzenesulfenate is accelerated by nucleophiles (Cl
−, Br
−, I
−, R
2S, AcO
− tertiary amines, and the substrate itself) through the attack at the proformyl carbon while water attacks at the sulfenyl sulfur.
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Minoru Yanokura, Masaki Minami, Sadamu Yamagata, Seiichiro Nakabayashi ...
1989 Volume 18 Issue 12 Pages
2197-2200
Published: 1989
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Cold fusion phenomenon becomes an exciting topic
1,2 in this year. Fusion reaction is suggested to take place in heavy water electrolysis with a combination of platinum and palladium electrodes. To ascertain this cold fusion process, we have analyzed hydrogen and helium isotopes in the palladium electrode by means of heavy ion Rutherford scattering and got some results on material aspect of this problem.
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Masanori Tamura, Akira Sekiya
1989 Volume 18 Issue 12 Pages
2201-2204
Published: 1989
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o- And
p-1,1-dihydroperfluoroalkoxyphenyl groups were introduced to polyallylamine and Langmuir–Blodgett films of the polymers were successfully prepared. Characterization of the films indicated that the surface energy becomes lower by introduction of perfluoroalkyl chains by ether bonds instead of carbon–carbon bonds in the polymer, and very low γc value, less than 10 dyn cm
−1, was achieved.
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Takehiko Kitamori, Tetsuya Matsui, Masaharu Sakagami, Tsuguo Sawada
1989 Volume 18 Issue 12 Pages
2205-2208
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A focused pulsed laser beam was irradiated on a CaCO
3 microparticle in water, and a laser breakdown of single microparticle was induced. In the laser breakdown plasma emission spectrum, the emission lines of Ca I and Ca II were observed, while these lines did not appear for the Ca
2+ aqueous solution. Hence this method is effective for analysis of microparticulate impurities in liquids.
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Asao Nakamura, Kunihiko Saitoh, Fujio Toda
1989 Volume 18 Issue 12 Pages
2209-2212
Published: 1989
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Simultaneous formation of two types of 1:1 complexes of 6-(4-methylphenylamino)-2-naphthalenesulfonate (6,2-TNS) with heptakis(2,3,6-tri-
O-methyl)-β-cyclodextrin (TMCD) in solution was detected by fluorescence spectroscopy. Fluorescence titration supported the formation of 1:1 complexes. However, the observed fluorescence spectrum was resolved into two components by time-resolved spectroscopy.
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Naoto Yazawa, Hiroshi Suzuki, Yasuo Yoshida, Osamu Furusawa, Yoshikazu ...
1989 Volume 18 Issue 12 Pages
2213-2216
Published: 1989
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Meta-fluoroaromatic compounds were effectively synthesized from
m-nitroaromatic or
m-fluorosulfonylaromatic compounds by replacement reaction with potassium fluoride in the presence of a catalytic amount of tetraphenylphosphonium bromide.
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Seiji Ujiie, Kazuyoshi Iimura
1989 Volume 18 Issue 12 Pages
2217-2218
Published: 1989
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A liquid crystalline chiral tartrate with
p′-nitoazobenzene mesogenic moiety was found to show cholesteric and chiral smectic phases. In the chiral smectic phase, the tartrate exhibited the ferroelectric properties. The mode value of spontaneous polarization was 5 mC/m
2 at 90 °C.
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Toshifumi Miyazawa, Hitoshi Iwanaga, Shinichi Ueji, Takashi Yamada, Sh ...
1989 Volume 18 Issue 12 Pages
2219-2222
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Porcine pancreatic lipase catalyzed the highly enantioselective hydrolysis of a kind of α-substituted carboxylic esters, i.e., the 2,2,2-trifluoroethyl esters of the
N-benzyloxycarbonyl derivatives of unusual amino acids.
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Naoki Sugimoto, Muneo Sasaki, Ryszard Kierzek, Douglas H. Turner
1989 Volume 18 Issue 12 Pages
2223-2226
Published: 1989
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Binding behavior of a fluorescent oligonucleotide εACUCU to a circularized intervening sequence from
Tetrahymena thermophila has been investigated by fluorescence titration. The binding constant was 9.5 × 10
6 mol
−1 dm
3 at 10 °C, roughly 3 orders of magnitude larger than expected for simple Watson–Crick base pairing.
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Koichi Okada, Atsushi Satsuma, Tadashi Hattori, Yuichi Murakami
1989 Volume 18 Issue 12 Pages
2227-2228
Published: 1989
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A novel method was proposed for the preparation of monolayer V
2O
5/TiO
2 catalysts with very high exposure of active sites. In the method, extra vanadium species in highly loaded V
2O
5/TiO
2 catalysts are selectively etched by HCl vapour.
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Akikazu Kakehi, Suketaka Ito, Susumu Hatanaka
1989 Volume 18 Issue 12 Pages
2229-2232
Published: 1989
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Title compounds were prepared in moderate yields by the reactions of 3-(mercaptomethylene)-1-phenyl-2(3
H)-indolizinones with bromoacetonitrile or phenacyl bromide in the presence of base.
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Koji Kato, Teruaki Mukaiyama
1989 Volume 18 Issue 12 Pages
2233-2236
Published: 1989
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Various vinylsilanes are directly converted to the corresponding ketones in high yields on treatment with molecular oxygen in the presence of a catalytic amount of cobalt(II) complex under neutral condition.
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