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Toshiaki Murai, Akihiro Hayashi, Takahiro Kanda, Shinzi Kato
1993 Volume 22 Issue 9 Pages
1469-1472
Published: 1993
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The reaction of lithium alkyneselenolates generated from lithium alkynides and selenium powder with a variety of thiols afforded selenothioic acid
S-alkyl esters in moderate to high yields. The product yields were highly dependent on the substituents of the starting acetylenes. The formation of unstable
S-aryl ester was confirmed by the enolization followed by alkylation.
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Hideyoshi Miyake, Kimiaki Yamamura
1993 Volume 22 Issue 9 Pages
1473-1474
Published: 1993
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Transmetallation of (
E)-1-phenyl-3-(tributylstannyl)propene and 3-phenyl-3-(tributylstannyl)propene with BuSnCl
3, and the isomerization of the transmetallated product are described. The application of the reactions to stereoselective (
Z)-3-phenyl-2-propenylation and
threo-1-phenyl-2-propenylation of aldehydes is also described.
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Yuichiro Himeda, Kazuhisa Hiratani, Kazuyuki Kasuga, Takuji Hirose
1993 Volume 22 Issue 9 Pages
1475-1478
Published: 1993
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2,9-Disubstituted 1,10-phenanthroline derivative with two benzo-15-crown-5 moieties can transport potassium ion with extremely high selectivity over other alkali and alkaline earth metal ions through chloroform liquid membrane.
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Kiyoshi Fuda, Kazuhito Suda, Toshiaki Matsunaga
1993 Volume 22 Issue 9 Pages
1479-1482
Published: 1993
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The intermediates obtained from thermal decomposition of Zn/Cr-layered double hydroxide carbonates (Zr/Cr-LDH; Zn
0.66Cr
0.34(OH)
2(CO
3)
0.170.57H
2O) were studied by XRD, TPD, FT-IR, ESCA and chemical analyses. It was found that Cr(III) ions embedded originally in the hydroxide layers were oxidized to Cr(VI) species in the temperature range between 473 and 773 K where the layer structure was lost, and reduced again to Cr(III) in the spinel phase over 773 K.
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Tatsuo Miyadera, Kiyohide Yoshida
1993 Volume 22 Issue 9 Pages
1483-1486
Published: 1993
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The effect of water vapor and SO
2 on the selective reduction of nitric oxide over alumina-supported Ag, In, Ga, Sn, and Zn catalysts has been investigated. Water vapor and SO
2 had large effect on the reactivity of propene and on the reduction of NO over those catalysts.
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Takashi Hayashita, Kenji Yamasaki, Xiaowu Huang, Richard A. Bartsch
1993 Volume 22 Issue 9 Pages
1487-1490
Published: 1993
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A novel dibenzopolyether resin possessing dicarboxylic acid side arm functionality (EDPAR) was synthesized by condensation polymerization of ethylenedi(oxy-
o-phenoxyacetic acid) with formaldehyde in formic acid. The excellent sorption for Pb(II) over Cu(II) obtained with EDPAR was not observed with commercially available iminodiacetic acid resin (CR-10). For EDPAR, the percent sorption of Pb(II) exceeded 90% at pH 2.5, while Cu(II) sorption was less than 30% at this pH.
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Mitsuhiro Yoshimatsu, Noriyuki Hatae, Hiroshi Shimizu, Tadashi Kataoka
1993 Volume 22 Issue 9 Pages
1491-1494
Published: 1993
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Oxacyclooctyl (oxocanyl) carbenium ions generated by treatment of
O-(5-hexenyl)-
Se,
O-heteroacetals or
O,
O-acetals with SnCl
4 underwent intramolecular 1,5-hydride transfer, and the α-oxy carbenium ions newly formed were hydrolyzed to give the 7-oxohexanols or 7-oxohexyl chlorides in good yields. Various
O-(5-hexenyl)-
Se,
O-heteroacetals or
O,
O-acetals were converted into 7-oxohexanols or 7-oxohexyl chlorides.
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Yasuko Kamochi, Tadahiro Kudo
1993 Volume 22 Issue 9 Pages
1495-1498
Published: 1993
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Aromatic carboxylic acids, esters, amides, nitriles, chlorides, ketones and nitro compounds were rapidly reduced by the samarium diiodide–H
2O system to the corresponding products at room temperature in good yields.
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Hitoshi Tamiaki, Kazuhiro Maruyama
1993 Volume 22 Issue 9 Pages
1499-1502
Published: 1993
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Synthetic peptide-bridged porphyrin-quinone molecules were easily available by use of a precursor for a chiral α-amino acid bearing quinone moiety on the side chain,
L-(2,5-dimethoxyphenyl)alanine. Photoinduced electron transfer from porphyrin to quinone in the molecules occurred in 2-methyltetrahydrofuran.
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Tomoo Matsuura, Shigeru Nishiyama, Shosuke Yamamura
1993 Volume 22 Issue 9 Pages
1503-1504
Published: 1993
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A practical synthesis of the cyclopentane derivative shared by the diterpenes isolated from the plant
Euphorbia helioscopia L. has successfully been accomplished starting from the optically active cyclopenten-diol derivative.
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Atsuhiro Osuka, Nobuhiro Tanabe, Run-Ping Zhang, Kazuhiro Maruyama
1993 Volume 22 Issue 9 Pages
1505-1508
Published: 1993
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Synthesis of linear porphyrin arrays of unusual length was reported. 1,4-Phenylene-bridged porphyrin oligomers up to a nonamer (ca. 122 Å length) were synthesized by acid catalyzed condensation of formyl-substituted porphyrins with dipyrrylmethane. The absorption and fluorescence spectra of these molecules exhibit systematic changes upon the increase in the number of the porphyrins.
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Takashi Kawamura, Masahiro Ebihara, Makoto Miyamoto
1993 Volume 22 Issue 9 Pages
1509-1512
Published: 1993
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In the crystal of the title compound, the aromatic ring of the cationic radical overlaps with a ring of a neighboring radical. The shortest intermolecular C····C distances are 3.617(5) and 3.646(6) Å. The result of HMO calculations is consistent with intermolecular interaction between the neighboring radicals, resulting in a three-dimensional interaction network involving Rh-Rh δ and aromatic π systems.
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Eiichiro Hata, Toshihiro Takai, Teruaki Mukaiyama
1993 Volume 22 Issue 9 Pages
1513-1516
Published: 1993
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In the presence of a catalytic amount of cobalt(III) complex such as tris(acetylacetonato)cobalt(III), tetrahydrofurans are oxygenated into the corresponding γ-butyrolactones under mild conditions on treatment with an atmospheric pressure of molecular oxygen and α-diketones having hydrogen atom next to the carbonyl carbon.
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Kiyoshi Otsuka, Tetsuya Ushiyama, Ichiro Yamanaka
1993 Volume 22 Issue 9 Pages
1517-1520
Published: 1993
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Direct conversion of methane into synthesis gas of H
2/CO ratio of 2 has been demonstrated using CeO
2 as an oxidant at 873–1073 K. The reaction was accelerated in the presence of Pt black (1 wt%). The reduced cerium oxide after the oxidation of methane can be used to convert carbon dioxide into carbon monoxide.
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Nobutoshi Komeda, Hirotaka Nagao, Gin-ya Adachi, Masatatsu Suzuki, Aki ...
1993 Volume 22 Issue 9 Pages
1521-1524
Published: 1993
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Electrochemical reduction of NO
2− by [Cu(tpa)(H
2O)](ClO
4)
2 (tpa = tris[(2-pyridyl)methyl]amine) under the controlled potential electrolysis at −0.40 V (
vs. Ag/AgCl) in H
2O (pH 7.0) catalytically produced N
2O with concomitant NO evolution. As the precursor of NO evolution, [Cu(tpa)(ONO)]PF
6 was characterized by X-ray crystallography.
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Shigeo Katsumura, Koji Ichikawa, Hajime Mori
1993 Volume 22 Issue 9 Pages
1525-1528
Published: 1993
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A straightforward synthesis of a tetrasubstituted halobutenolide, bromobeckerelide, was achieved by photosensitized oxygenation of a trisubstituted α-trialkylsilylfuran which was obtained by the introduction of desired substituents into a furan ring via regioselective lithiation.
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Kazutoshi Miyazawa, Naoyuki Yoshida
1993 Volume 22 Issue 9 Pages
1529-1530
Published: 1993
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(2
S,4
R)-1-Acetoxy-2,4-
O-isopropylidene-1,2,5-pentanetriol, which is expected to be an intermediate for a synthesis of an inhibitor of HMG-CoA reductase, was synthesized by lipase catalyzed regio- and enantioselective transesterifications.
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Takayuki Kawashima, Hiroki Iwanaga, Renji Okazaki
1993 Volume 22 Issue 9 Pages
1531-1532
Published: 1993
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Sequential treatment of optically active Se-benzyl t-butylphenylselenophosphinate with PhLi and then with electrophiles such as alkyl halides and elemental selenium gave optically active phosphorus compounds in good chemical and optical yields with a retention of configuration at phosphorus atom, together with benzyl phenyl selenide.
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Hisakazu Mihara, Kin-ya Tomizaki, Norikazu Nishino, Tsutomu Fujimoto
1993 Volume 22 Issue 9 Pages
1533-1536
Published: 1993
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Four α-helix bundle proteins containing flavin moieties (7-acetyl-10-methylisoalloxazine) were
de novo designed and synthesized. The artificial proteins could effectively catalyze the oxidation of dihydronicotinamides under controlled conditions for bundle structure.
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Toshihito Miyama, Yoshiro Yonezawa, Tomoo Sato, Junzo Umemura, Tohru T ...
1993 Volume 22 Issue 9 Pages
1537-1540
Published: 1993
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A Raman signal arising from carboxylate ions in thin films of silver salt of carboxymethylcellulose (CMCAg film) was fairly increased, when the CMCAg film was photolyzed with UV-light. The maximum enhancement was achieved in the CMCAg film irradiated for 180 min. It is likely that the intensity enhancement of the carboxylate ions reflects the contribution of surface-enhanced Raman scattering (SERS).
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Masanori Abe, Joe Otsuki, Koji Araki
1993 Volume 22 Issue 9 Pages
1541-1544
Published: 1993
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The host
1 having aromatic amide structure exhibits an anomalous fluorescence with a large Stokes shift at around 500 nm, and multiple hydrogen-bonding interaction of the host
1 with uracil derivatives is directly monitored by increase of this fluorescence intensity when the amide bond rotation is affected by the association.
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Hideo Nagata, Taijiro Takakura, Masahiro Kishida, Koichi Mizuno, Yukio ...
1993 Volume 22 Issue 9 Pages
1545-1546
Published: 1993
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The catalytic oxidative decomposition of chlorofluorocarbons (CFC’s) was carried out in the presence of butane. The reactivity of CFC’s was the following order: CFC-113 > CFC-114 > CFC-115. The reactivity decreased as the content of fluorine in the CFC’s increased. γ-Alumina was an effective catalyst among silica and various acidic oxides. Vanadium(V) oxide and tungsten(VI) oxide were found to exhibit a higher activity than the other metals and metal oxides when supported on γ-alumma.
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Kotaro Araya
1993 Volume 22 Issue 9 Pages
1547-1550
Published: 1993
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Liquid crystal polymerization method was modified in order to prepare a vertically aligned polyacetylene film. As a result, a film with a very curious morphology was formed. The film was composed of two layers. The layer on the solvent side was a vertically oriented fibril structure, whereas the layer on the acetylene gas side was a randomly oriented fibril structure. The modified method is a very promising one for visualizing the polymer growth process, and the present work clearly demonstrates that a polyacetylene chain grows in the liquid crystal solvent.
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Itaru Hamachi, Hidetoshi Fujimura, Toyoki Kunitake
1993 Volume 22 Issue 9 Pages
1551-1554
Published: 1993
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Zinc-substituted myoglobin (Zn-Mb) and a cationic cyanine dye were bound simultaneously to an aqueous dispersion or a cast film of a phosphate bilayer membrane. The energy transfer from Zn-Mb to the cyanine was more efficient in the cast film than in aqueous dispersion.
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Nobuyuki Higashiyama, Kazuki Takemura, Ryo Iwamura, Keiichi Kimura, Gi ...
1993 Volume 22 Issue 9 Pages
1555-1558
Published: 1993
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Methacryloyloxymethyl-4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane (MA[2.2.2]) has been synthesized and polymerized singly or copolymerized with methyl methacrylate (MMA). Complexes of these cryptand-attaching polymers with divalent europium ions exhibited blue luminescence located at ca. 450 nm. Encryptation of Eu
2+ resulted in a large shift to lower wave number up to ca. 30–60 cm
−1, in the infrared absorptions due to cryptand’s C-O-C stretching vibrations. The photophysical properties confirmed 1 : 1 stoichiometry of the Eu
2+ cryptate.
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Hayao Kobayashi, Takashi Udagawa, Hideto Tomita, Kozo Bun, Toshio Nait ...
1993 Volume 22 Issue 9 Pages
1559-1562
Published: 1993
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λ(BEDT-TSF)
2GaCl
4 has revealed to be a new organic superconductor, where BEDT-TSF is bis(ethylenedithio)tetraselena-fulvalene. The onset temperature of the superconducting transition was about 9.5 K and the mid-point transition temperature (
Tc) was 8 K. The crystal belongs to triclinic system. BEDT-TSF molecules are arranged to form a “quasi-stacking structure,” where four molecules form a repeating unit.
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Shinichi Motoki, Takaya Sakai, Ikuo Shinoda, Takao Saito, Tokiko Uchid ...
1993 Volume 22 Issue 9 Pages
1563-1566
Published: 1993
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Treatment of 2,9-dithia-1-phosphabicyclo[4.3.0]-nona-3,7-diene 1-sulfides with
n-Bu
3P afforded 1,2-thiaphospholes in good yields. The thiaphospholes reacted thermally with norbornene to produce 1 : 2 double Diels-Alder cycloadducts, whereas they reacted with acrylic esters in the presence of Lewis acid to give tandem Diels-Alder/β-addition adducts.
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Yumiko Osa, Eisuke Kaji, Keiko Takahashi, Motoko Hirooka, Shonosuke Ze ...
1993 Volume 22 Issue 9 Pages
1567-1570
Published: 1993
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A new type of artificial glycolipid constituted with 2-acetamido-2-deoxy-β-D-mannuronic acid was synthesized utilizing a readily accessible building block, methyl 2-(benzoyloxy)iminoglycosuronate as the glycosyl donor. Stereocontrolled β-glycosidation of the donor was as smoothly effected as the subsequent stereospecific reduction of (benzoyloxy)imino function. After anomeric activation, attachment of the spacer (2-aminoethanol)-linked stearic acid and final deblocking gave the designed glycolipid in good overall yield.
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Shinji Toyota, Tsutomu Miyasaka, Michinori Oki
1993 Volume 22 Issue 9 Pages
1571-1574
Published: 1993
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The racemates of the rotational isomers of the mother acids of the title compounds were resolved via their camphor sultam amides and their absolute conformation was determined by X-ray crystallography. The chiroptical properties of the methyl esters are correlated with the absolute conformations. Both of these compounds are shown to possess dextrorotatory property at Na D line, if their stereochemistry is
Psc.
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Yuji Makita, Hidetoshi Umebayashi, Takehiko Suzuki, Akio Masuda, Masaa ...
1993 Volume 22 Issue 9 Pages
1575-1578
Published: 1993
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Transition metal ion- and ketone-catalyzed decompositions of peroxymonosulfate ion were found to produce light emission. The luminous decompositions permitted flow chemiluminescent determinations of cobalt(II), iron(II) and vanadium(IV) ions and fluorescent organic compounds.
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Kiyotaka Yorozu, Toshihiro Takai, Tohru Yamada, Teruaki Mukaiyama
1993 Volume 22 Issue 9 Pages
1579-1582
Published: 1993
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Synthesis of acid-sensitive epoxides such as epoxide of bishomoallyl alcohol or chromene oxide was achieved by the epoxidation of corresponding olefins with combined use of molecular oxygen and propionaldehyde diethyl acetal catalyzed by cobalt(II) complex. Various silyl enol ethers and silyl ketene acetals, acid-sensitive compounds, were also smoothly monooxygenated into the corresponding α-hydroxy carbonyl compounds.
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Takashi Yamada, Yuichiro Omote, Yoshio Nakamura, Toshifumi Miyazawa, S ...
1993 Volume 22 Issue 9 Pages
1583-1586
Published: 1993
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Both couplings of N-benzyloxycarbonyl-α,α-diphenylglycine (Z-Dph) with methyl esters of various amino acids (AA-OMe) and Z-AA with Dph-OMe by various methods can yield Z-Dph-AA-OMe and Z-AA-Dph-OMe, respectively. Yields of the dipeptides remarkably differ from over 90% to 0% depending on the coupling method employed.
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Seiichiro Ogawa, Shin-ichi Sasaki, Hidetoshi Tsunoda
1993 Volume 22 Issue 9 Pages
1587-1590
Published: 1993
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Some oxo-linked 5a-carba-di- and tri-saccharides of biological interests including 5a-carbamaltose, were synthesized by coupling of 5a-carba-glycosyl donor, 1,2-anhydro-5a-carba-β-
D-mannopyranose derivative with the alkoxides generated from the protected hexopyranose derivatives in
N,
N-dimethylformamide in the presence of a crown ether.
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Manabu Igawa, Hideo Tanabe, Takahiro Ida, Fumiko Yamamoto, Hiroshi Oko ...
1993 Volume 22 Issue 9 Pages
1591-1594
Published: 1993
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Neutralization dialysis is a very effective deionization method and the transport of weak acids and bases is also facilitated by the neutralization reaction in the system. The transport rates of weak acids and bases increased with the increase of their dissociation constants.
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Fumiaki Inokuchi, Yutaka Shiomi, Hirosuke Kawabata, Toru Sakaki, Seiji ...
1993 Volume 22 Issue 9 Pages
1595-1598
Published: 1993
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It was found that the metal selectivity of calix[n]aryl acetates (n = 4, 6, and 8) can be conveniently estimated by mass spectrometry. The results have disclosed several new phenomena which cannot be found through conventional solvent extraction.
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Kentaro Okuma, Masashi Shimasaki, Kazuki Kojima, Hiroshi Ohta, Renji O ...
1993 Volume 22 Issue 9 Pages
1599-1602
Published: 1993
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Reaction of phosphonium ylides with excess sulfur afforded the corresponding thiosulfines, which were trapped with maleic anhydride to give the corresponding cycloadducts (1,2-dithiolanes) in good yields. Intermediary thiosulfines were also formed by sulfurization of thiobenzophenones with elemental sulfur to give the 1,2-dithiolanes in moderate yields.
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Koichi Iwata, Bulat Toleutaev, Hiro-o Hamaguchi
1993 Volume 22 Issue 9 Pages
1603-1606
Published: 1993
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The lifetime of the first excited singlet state of trans-stilbene (S
1 tSB) in carbon tetrachloride at room temperature is determined to be 3.1 ± 0.2 ps with the use of time-resolved Raman, absorption, and fluorescence spectroscopies. The lifetime of 3.1 ps is shorter than the shortest value ever reported by an order of magnitude. The steady state photoirradiation of tSB in carbon tetrachloride shows that the decomposition of the tSB molecule is the primary cause of the lifetime shortening.
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Sen-ichi Aizawa, Takeyoshi Yagyu, Shigenobu Funahashi
1993 Volume 22 Issue 9 Pages
1607-1610
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The acetonitrile exchange rates at the palladium(II) complex with diethylenetriamine have been measured at various temperatures by the NMR line-broadening method. The dependence of the exchange rate on the concentration of the free solvent indicates the two reaction paths with dissociative and associative mechanisms. This unique concerted mechanism has been ascribed to the promotion of the dissociative path by the ion pair formation with tetrafluoroborate.
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Naoki Toshima, Yuan Wang
1993 Volume 22 Issue 9 Pages
1611-1614
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Polymer-protected Cu/Pd bimetallic colloids with different atomic ratio of Cu to Pd were successfully prepared by refluxing a glycol solution of hydroxide of copper and palladium in the presence of poly(N-vinyl-2-pyrrolidone). The TEM, XRD, AAS and UV-vis spectrum measurements indicate the formation of bimetallic alloy phase in the bimetallic colloids. High catalytic activity and selectivity for the hydration of acrylonitrile to acrylamide was achieved by using the Cu/Pd(Cu/Pd = 2) bimetallic colloid as a catalyst.
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Kiyoshi Kudo, Koichi Mitsuhashi, Sadayuki Mori, Koichi Komatsu, Nobuyu ...
1993 Volume 22 Issue 9 Pages
1615-1618
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The cyclocarbonylation of isopropenyl acetate(
1) to produce 2-methoxy-2,5,5-trimethyl-1,3-dioxolan-4-one(
2) by use of palladium(II)-phoshine catalyst with methanol in benzene solution was studied at 100 °C under 200 atm of CO. Conversion of up to 98% and yield to
2 as high as 67% were attained.
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Koji Iwase, Satoshi Inagaki
1993 Volume 22 Issue 9 Pages
1619-1622
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Orbital phase continuity requirements were derived for stabilizing triplet states, and successfully applied to acyclic conjugated diradicals.
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Shin-Ichiro Nishimura, Yoshiaki Miura, Longdi Ren, Manabu Sato, Akihik ...
1993 Volume 22 Issue 9 Pages
1623-1626
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The first example of an unique and efficient method for the preparation of amphiphilic polysaccharides having self-assembling nature is described. Regio- and thermospecific chemical manipulations of a standardized intermediate derived from chitosan markedly facilitated the synthetic procedures of novel types of polysaccharide architectures. Artificial glycolipid-type polymers showed excellent properties to form stable monolayer membranes at air/water interface.
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Teruaki Mukaiyama, Takafumi Matsutani, Naoyuki Shimomura
1993 Volume 22 Issue 9 Pages
1627-1630
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Catalytic stereoselective synthesis of several ribonucleosides from 2,3,5-tri-O-benzoyl-β-D-ribofuranosyl methyl carbonate and trimethylsilylated nucleoside bases is efficiently carried out by combined use of silver salts and diphenyltin sulfide (Ph
2Sn=S) under mild conditions.
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Susumu Kuwabata, Ryo Tsuda, Kazufumi Nishida, Hiroshi Yoneyama
1993 Volume 22 Issue 9 Pages
1631-1634
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Electrolysis of carbon dioxide-saturated phosphate buffer solution (pH 7) in the presence of formate dehydrogenase and methanol dehydrogenase as electrocatalysts together with methylviologen as an electron relay yielded formaldehyde and methanol as the reduction products of carbon dioxide under suitable electrolysis conditions, and the use of pyrrolo-quinoline quinone in place of methylviologen as the electron relay afforded selective reduction of carbon dioxide to methanol.
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Tomoyuki Yuba, Masa-aki Kakimoto, Yoshio Imai, Masatsugu Shigeno
1993 Volume 22 Issue 9 Pages
1635-1636
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The surface of a LB film of polyamic acid long alkyl amine salts, consisted of a mixture of aromatic and aliphatic polyamic acids, was observed by means of friction force microscopy (FFM). The LB film having 11 layers gave no significant pattern by atomic force microscopy (AFM), whereas clearly phase separated morphology was observed by using FFM.
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Atsushi Okada, Yasuo Negishi, Yuichi Shimizu, Shun’ichi Sugimoto ...
1993 Volume 22 Issue 9 Pages
1637-1638
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Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) was endowed with the high wettability by ArF-laser irradiation in water dissolved carbon monoxide. The enhancement of the wettability was closely related to the decrease of the F/C atomic ratio and the increase of the O/C ratio measured by X-ray photoelectron spectroscopy (XPS), suggesting the formation of the polar groups such as ethylene linkage and carbonyl group with the release of fluorine atom.
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