-
Yasuo Yamamoto, Keiichi Ajito, Yasuo Ohtsuka
1998 Volume 27 Issue 5 Pages
379-380
Published: 1998
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Several classes of asymmetrical N,N′-disubstituted aryl piperazine and benzyl piperazine derivatives were successfully synthesized by the solid phase method from the same intermediate.
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Suguru Higashida, Katsura Nishiyama, Shin-ichi Yusa, Yotaro Morishima, ...
1998 Volume 27 Issue 5 Pages
381-382
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C
60 was covalently incorporated into hydrophobic cluster of amphiphilic polysulfonates. In this cluster C
60 chromophores showed extremely blue-shifted fluorescence and no thermally activated delayed fluorescence.
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Jun-ichi Kadokawa, Daisuke Hino, Masa Karasu, Hideyuki Tagaya, Koji Ch ...
1998 Volume 27 Issue 5 Pages
383-384
Published: 1998
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This paper describes synthesis of a new aminopolysaccharide by thermal polymerization of 6-amino-6-deoxy-D-glucose in the presence of acetic acid. The polymerization proceeded via Amadori rearrangement to give the aminopolysaccharide having aminoketose structure in the main chain. The molecular weight was determined by GPC analysis after acetylation of the product polysaccharide.
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Kenji Okuyama, Venugopalan Nagarajan, Shigehiro Kamitori, Keiichi Nogu ...
1998 Volume 27 Issue 5 Pages
385-386
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Two morphologically different crystals of a collagen model peptide(Pro-Hyp-Gly)
10 were obtained using PEG 200 as the precipitating agent. Both the crystals belonged to a monoclinic system with the space group P2
1 and diffracted to a resolution of 1.8 Å. Although the crystal data were quite different from those of homologous model peptide, (Pro-Pro-Gly)
10, the cylindrical Patterson map showed that the main chain conformation of this compound is exactly the same as that of (Pro-Pro-Gly)
10. This result supports the Okuyama model for collagen structure.
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Kohjiro Hara, Kazuhiro Sayama, Hironori Arakawa
1998 Volume 27 Issue 5 Pages
387-388
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Hydrogen and oxygen were produced, respectively, from water in the presence of sacrificial reagents by photocatalytic reaction using RuS
2 powder catalyst under UV light irradiation for the first time. Photocatalytic activity of RuS
2 significantly improved by support on SiO
2.
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Masahito Kodera, Yoshimitsu Tachi, Shun Hirota, Kou Katayama, Hisashi ...
1998 Volume 27 Issue 5 Pages
389-390
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Di-μ-hydroxodicopper(II) complex with a hexapyridine dinucleating ligand, [Cu
2(OH)
2(hexpy)](CF
3SO
3)
2 (hexpy=1,2-bis[2-(bis(2-pyridyl)methyl)-6-pyridyl]ethane), reacts with H
2O
2 in MeCN/CH
2Cl
2 to give a superoxodicopper(II) complex.
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Akihiko Kudo, Karoi Watanabe, Yuji Minakata, Akiyo Mine
1998 Volume 27 Issue 5 Pages
391-392
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NO was efficiently reduced on ZnO and In
2O
3 of n-type semiconductor electrodes in aqueous solutions. Harmless N
2 was obtained as a main reduction product. Current-potential curves on the ZnO and In
2O
3 electrodes under NO were quite similar to those under N
2O. It is proposed that the NO reduction on the ZnO and In
2O
3 electrodes proceeds via the redox mechanism in which oxygen vacancies formed by the electrochemical reduction on the electrode surface play an important role.
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Soo Ho Ban, Yujiro Hayashi, Koichi Narasaka
1998 Volume 27 Issue 5 Pages
393-394
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Reaction of tricarbonyl[(2,3,4,5-η)-2,4-cyclohexadien-1-one O-benzyloxime]iron and organocuprates, followed by the treatment with acetic anhydride and carbon monoxide, affords [(1,2,3,4-η)-1-(N-acetoxy-N-benzyloxyamino)-5-endo-acyl-1,3-cyclohexadiene]tricarbonylirons, which are converted to m-acylaniline derivatives by treating with potassium carbonate.
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Mitsuhiko Iwakoshi, Soo Ho Ban, Yujiro Hayashi, Koichi Narasaka
1998 Volume 27 Issue 5 Pages
395-396
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Reaction of [(1,2,3,4-η)-5-alkylidene-1,3-cyclohexadiene]tricarbonylirons and organometallic reagents generates acyl[(1,2,3,4,5-η)-1-alkylcyclohexadienyl]dicarbonylirons. The acyl group in these complexes migrates to the cyclohexadienyl moiety under carbon monoxide atmosphere, providing [(1,2,3,4-η)-6-acyl-2-alkyl-1,3-cyclohexadiene]tricarbonylirons, which are further transformed to m-alkylphenyl ketones by the oxidation with trimethylamine N-oxide.
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Kunio Hiroi, Fumiko Kato, Akiko Yamagata
1998 Volume 27 Issue 5 Pages
397-398
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Asymmetric direct α,β-functionalization of allenes with chiral phosphine ligands was successfully achieved with extremely high enantioselectivity via asymmetric carbopalladation to the racemic allenes. The same palladium-catalyzed alkylation of a chiral allene was executed with complete enantiospecificity. The stereochemistry of this reaction was determined and the mechanism of this asymmetric induction is proposed.
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Mineo Hashizume, Toshinori Sato, Yoshio Okahata
1998 Volume 27 Issue 5 Pages
399-400
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Phase separation was observed by measuring surface pressure (π)-area (A) isotherms of the mixed monolayer of lactosylceramide (LacCer) and dioleoylphosphatidylcholine (DOPC). Bindings of Allomyrina dichotoma (allo A) lectin to LacCer in mixed monolayers were measured by means of quartz-crystal microbalance (QCM) that was attached horizontally to the monolayers. Allo A showed the high binding affinity for the LacCer phase-separated in the DOPC monolayer, but showed the low binding affinity for the LacCer homogeneously mixed with dipalmitoylphosphatidylcholine (DPPC) matrix.
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Satoshi Nakata, Yoko Hirata, Rie Takitani, Kenichi Yoshikawa
1998 Volume 27 Issue 5 Pages
401-402
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We propose a novel sensing system based on the multidimensional information contained in a dynamic nonlinear response. A sinusoidal potential was applied to an amperometric L-amino acid sensor, and the resulting current of the sensor was analyzed by fast Fourier transformation (FFT). The amplitudes of the higher harmonics of the FFT characterize the nonlinear properties of the response. The amplitudes of the higher harmonics of the FFT exhibit characteristic changes which depend on the concentration and the chemical structure of amino acids at the sensor surface.
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Takashi Ooi, Yuichiro Kondo, Kana Kon-i, Keiji Maruoka
1998 Volume 27 Issue 5 Pages
403-404
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Selective 1,4- and 1,6-addition of alkyllithium reagents to α,β,γ,δ-unsaturated aldehydes has been successfully realized with fluorinated aluminum tris(2,6-diphenylphenoxide) (ATPH) derivatives as functionalized Lewis acid receptors.
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Seunghun Eu, Woon-kie Paik
1998 Volume 27 Issue 5 Pages
405-406
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Electrochemical and ellipsometric measurements were made on gold surface while alkanethiols and organic disulfides were adsorbed. Anodic oxidation was observed to occur with molecular layer formation from thiols. Disulfide molecules appeared to oxidatively adsorb after reductive dissociation.
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Hiroyuki Ohno, Ken-ichi Kato
1998 Volume 27 Issue 5 Pages
407-408
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Gold electrode was modified with poly(ethylene oxide)s having thiol end (PEO-SH). The electron transfer reaction of cytochrome c was evaluated by the gold electrode modified with PEO-SH, having PEO molecular weight of 150, where the adsorption of proteins and resulting denaturation were restrained. The increase of PEO molecular weight conducted suppression of the redox responses at the modified gold electrode.
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Seiji Amano, Kenshu Fujiwara, Akio Murai
1998 Volume 27 Issue 5 Pages
409-410
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In the reductive lithiation of 2-phenylthiooxolane system, the coexistence of the substituents at C2 and C3 with cis-configuration was found to increase the ratio of 2,5-trans-2-lithiooxolane at 2,5-cis derivative.
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Yoko Matsuzawa, Takahiro Seki, Kunihiro Ichimura
1998 Volume 27 Issue 5 Pages
411-412
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Perpendicular orientation of nematic liquid crystalline azobenzene (C6Azo) on a water surface was demonstrated by spreading a mixture of C6Azo with O-octacarboxymethylated calix[4]resorcinarene (CRA-CM) as a host. A host-guest mixed monolayer of C6Azo with CRA-CM formed a double-layered structure by further compression.
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Masaharu Tsuji, Erika Oda, Masafumi Nakamura, Yukio Nishimura
1998 Volume 27 Issue 5 Pages
413-414
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The ion-ion neutralization reaction of CO
2+ with C
6F
6− has been spectroscopically studied in a He flowing afterglow. The CO(d
3Δ
1-a
3Π
r) transition from v′=0-3 and the CO(a′
3Σ
+-a
3Π
r) transition from v′=3-7 were observed with a CO(a′-a)/CO(d-a) ratio of 3.9. The vibrational distributions of CO(d,a′) indicated that 43 and 62 % of the total excess energies are deposited into vibrational modes of CO(d) and CO(a′), respectively.
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Yuko Tajima, Haruki Ishikawa, Yoichi Shimanuki, Takashi Miyazawa, Naoh ...
1998 Volume 27 Issue 5 Pages
415-416
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Facile Si-Si bond cleavage reactions of cation radicals of jet-cooled clusters of (p-cyanophenyl)pentamethyldisilane with H
2O or CH
3OH were found to occur via intracluster nucleophilic attack of a solvent molecule by means of resonance-enhanced two photon ionization mass spectrometry.
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Takehiko Ueda, Stephen J. Lee, Yoichi Nakatani, Guy Ourisson, Junzo Su ...
1998 Volume 27 Issue 5 Pages
417-418
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POPC giant liposomes were incubated with pullulan that was hydrophobized by cholesteryl groups and labelled by a fluorescent marker (FITC). Confocal laser microscopy clearly showed coating of the outer surface of the liposomes with the polymer. This is the first and direct observation of the supramolecular assembly of an artificial cell wall onto cell-sized liposomes.
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Fulvio Cacace, Maurizio Speranza
1998 Volume 27 Issue 5 Pages
419-420
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A comprehensive view on the basicity order of simple molecules, including ozone, is reported and contrasted with recent estimates in heterogeneous systems.
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Masahiro Mikuriya, Mika Fukuya
1998 Volume 27 Issue 5 Pages
421-422
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A mixed-valence cobalt(II, III) complex, [Co
6L
2(CH
3COO)
2(CH
3O)
6L′]·2CH
3OH(H
3L=2,6-bis(saliclylideneaminomethyl)-4-methylphenol and H
2L′=salicylazine), has been isolated and characterized by X-ray crystallography, which reveals a unique hexanuclear structure consisting of two defective cubane-cores.
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Nagao Kobayashi, Yuko Yoshikawa, Osamu Ito, H. Bruce Goodbrand, Jim Ma ...
1998 Volume 27 Issue 5 Pages
423-424
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Fluoranthocyanine, a phthalocyanine analog fused by four five-membered rings and four 1,8-naphthalene units, has been synthesized and characterized by electronic absorption, magnetic circular dichroism, and fluorescence spectroscopy.
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Tamon Okano, Jitsuo Kiji, Yoshiharu Toyooka
1998 Volume 27 Issue 5 Pages
425-426
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The cyanation of aryl iodides with NaCN under heptane-water two-phase conditions is efficiently catalyzed by PdCl
2{PPh
2(m-C
6H
4SO
3Na)}
2 in the presence of zinc chloride and NaBH
4, and gave the corresponding aryl nitriles in high yields. The biphasic cyanation had an advantage in that the aryl nitriles are easily separated from the mixtures of catalyst and reagents.
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Takashi Hoshi, Ryusaku Shimada, Chizuko Kabuto, Takanobu Sanji, Hideki ...
1998 Volume 27 Issue 5 Pages
427-428
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(Trimethylsilylmethyl)trimethyldisilene was generated photochemically from 1-phenyl-7-trimethylsilylmethyl-7,8,8-trimethyl-7,8-disilabicyclo[2.2.2]octa-2,5-diene (masked disilene). UV spectrum and regioselectivity of the addition reaction of phenols to the disilene were discussed. The molecular structure of the masked disilene was also determined by single-crystal X-ray diffraction.
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Noriyasu Okazaki, Shinya Tsuda, Yoshikazu Shiina, Akio Tada, Masakazu ...
1998 Volume 27 Issue 5 Pages
429-430
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The synthesis of Co
3O
4-free CoAl
2O
4 was successfully achieved, and its was revealed that this oxide (CoAl
2O
4) was more active than Al
2O
3 for NO+O
2 reaction, the initiation step of the selective reduction of NO over cobalt-loaded aluminas, but was less active than Co
3O
4-containing CoAl
2O
4 for C
2H
4+O
2 reaction, a side reaction.
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Ruimao Hua, Masato Tanaka
1998 Volume 27 Issue 5 Pages
431-432
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Diphenylphosphinic acid adds across the triple bond of terminal alkynes in the presence of Ru
3(CO)
12, leading to regioselective formation of alkenyl diphenylphosphinates CH
2=C(R)[OP(O)Ph
2].
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Hitoshi Tojo, Atsushi Kameyama, Tadatomi Nishikubo
1998 Volume 27 Issue 5 Pages
433-434
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Functional diamines with cationically polymerizable groups were successfully prepared in one-step by the chemoselective reaction of 4,4′-diamino-3,3′-dicarboxydiphenylmethane (1) using 1,8-diazabicyclo-[5.4.0]-7-undecene (DBU). The reaction of 1 with propargyl bromide (2a), 2-chloroethyl vinyl ether (2b), and 2-bromomethyl-1,4,6-trioxa-spiro[4.4]nonane (2c) using DBU proceeded chemoselectively under mild conditions without any protection of the amino group to produce the corresponding diamines (3a-3c) in high yields.
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Takehiko Mori, Kyoji Murata, Yohji Misaki, Kazuyoshi Tanaka
1998 Volume 27 Issue 5 Pages
435-436
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DTM-TTP (2-(4,5-bisthiomethyl-1,3-dithiol-2-ylidene)-5-(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) and TCNQ (tetracyanoquinodimethane) form the title 1:1 complex including 1,1,2-trichloroethane (TCE). The crystal structure is composed of segregated stacks. This complex undergoes a metal-insulator transition around 100 K. Thermoelectric power takes small positive values, and the magnetic susceptibility is paramagnetic down to low temperatures.
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Ayako Ono, Katsuya Uchiyama, Yujiro Hayashi, Koichi Narasaka
1998 Volume 27 Issue 5 Pages
437-438
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8-Hydroxy-1,2,3,4-tetrahydroquinolines are synthesized from m-hydroxyphenethyl ketone O-2,4-dinitrophenyloximes by the cyclization on the sp
2 nitrogen atom of the oxime derivatives using sodium hydride and sodium cyanoborohydride.
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Shuji Oishi, Yoshiteru Nagai, Koji Chiba, Nobuo Ishizawa
1998 Volume 27 Issue 5 Pages
439-440
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Rectangular thin plate-shaped crystals of layered perovskite-type Na
2Ca
2Nb
4O
13 were grown from a Na
2SO
4 flux by a slow cooling method. The crystals of sizes up to 0.8 mm × 0.8 mm × 0.05 mm were grown. The obtained crystals were colorless and transparent. The most suitable solute content was 6 mol%. The structure had a pseudotetragonal symmetry.
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Masahito Kodera, Hisashi Shimakoshi, Yoshimitsu Tachi, Kou Katayama, K ...
1998 Volume 27 Issue 5 Pages
441-442
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The di-μ-hydroxodicopper(II) complexes [Cu
2(OH)
2(hexpy)](X)
2[X=ClO
4 and CF
3SO
3, hexpy: 1,2-bis[2-di-(2-pyridyl)methyl-6-pyridyl]ethane] efficiently catalyze the oxidation of various phenols with H
2O
2.
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Atsunori Mori, Eisuke Takahisa, Hiroshi Kajiro, Kazunori Hirabayashi, ...
1998 Volume 27 Issue 5 Pages
443-444
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Both (E)- and (Z)-alkenylsilanes are synthesized by the reaction of hydrosilanes and 1-alkynes catalyzed by RhCl(PPh
3)
3/NaI or RhI(PPh
3)
3 highly selectively.
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Nobuko Komatsuzaki, Hidetoshi Kikuchi, Mari Yamamoto, Mitsunari Uno, S ...
1998 Volume 27 Issue 5 Pages
445-446
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The reaction of (trisubstituted cyclopentadienyl)tris(acetonitrile)ruthenium complexes, [Cp′Ru(CH
3CN)
3][PF
6], with prochiral trisubstituted arenes gave planar-chiral [Cp′Ru(arene)][PF
6] complexes with a diastereoselectivity up to 46% d.e.
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Ken-ichi Takao, Seigo Nagata, Susumu Kobayashi, Hisanaka Ito, Takeo Ta ...
1998 Volume 27 Issue 5 Pages
447-448
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A model study for the total synthesis of australifungin was performed. Olefinic aldehyde was successfully converted to the target molecule having both α-diketone and β-ketoaldehyde moieties.
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Hai-Ming Zhang, Xiu-Qin Ruan, Qing-Xiang Guo, You-Cheng Liu
1998 Volume 27 Issue 5 Pages
449-450
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Oxidation of N-benzylphenothiazine with nitric acid in aqueous solution was investigated in the presence of β-cyclodextrin by means of UV-vis and ESR spectroscopy. The N-benzylphenothiazine radical cation generated in β-cyclodextrin cavity is much more stable than that outside of β-cyclodextrin cavity and that in organic solvent.
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Shinji Yamada, Noriko Nunami, Kayako Hori
1998 Volume 27 Issue 5 Pages
451-452
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The structure of N-pivaloylphthalimide was studied by IR,
13C NMR and UV spectroscopies, and X-ray analysis. The C(O)-N bond is orthogonally twisted, and the bond length is as long as that of C-N single bond.
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Jian-Yu Zheng, Katsuaki Konishi, Takuzo Aida
1998 Volume 27 Issue 5 Pages
453-454
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A dialkylsilicon porphyrin Si(TPP)(CH
2CH
3)
2 (1) (TPP=5,10,15,20-tetraphenylporphinato) reacted with dioxygen in the dark to give a bis(ethylperoxide) complex (5), from which a dihydroxysilicon porphyrin (Si(TPP)(OH)
2, (6) was obtained upon reduction and hydrolysis. In contrast with the phosphorous analogue [P(TPP)(OH)
2]OH, the crystal structure of 6 showed an almost planar conformation of the porphyrin ligand.
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Takanori Masukawa, Hirohide Kato, Takashi Kakiuchi, Krishanthi Padmara ...
1998 Volume 27 Issue 5 Pages
455-456
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C/D-Ring components of phycobilin derivatives bearing a photoreactive group at D-ring were regioselectively synthesized by applying our original synthetic reactions such as acid-catalyzed rearrangement of 2-tosyl group of 3,4-disubstituted 2-tosylpyrroles to 5-position, regioselective preparation of 3,4-disubstituted 5-tosylpyrrolinones, and their Wittig-type new coupling reaction with 2-formyl pyrrole.
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Minoru Handa, Takami Suzuki, Hiroki Fukuda, Yukio Sasaki
1998 Volume 27 Issue 5 Pages
457-458
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3-Ethyl-4-ethylsydnone was newly synthesized, and the physical properties of 3-ethylsydnone, 3-ethyl-4-methylsydnone and 3-ethyl-4-ethylsydnone at various temperatures were investigated. The highest dielectric constant was for 3-ethylsydnone. The alkyl substituent effect at the 4-position of the sydnone ring on the dielectric constant can be explained by the
13C NMR spectra.
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Venkatachalam Sridevi, Renganathan Ramaswamy
1998 Volume 27 Issue 5 Pages
459-460
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The striking similarity between the nonlinear dynamical phenomena in chemical systems and those in biological systems, has enhanced the interest in the search of new reaction-diffusion systems. Here we report an oscillatory chemical system, which exhibits different types of chemical waves and patterns when kept unstirred. The reaction constituents are 1,2,3-trihydroxybenzene (pyrogallol), ferroin, sulphuric acid and potassium bromate. The system has a significant advantage of being gas-free.
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Madabhushi Sridhar, Butty Ashok Kumar
1998 Volume 27 Issue 5 Pages
461-462
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2,4,6-Triphenylpyrylium tetrafluoroborate sensitized oxygenation of cycloalkenes to allylic hydroperoxides is described. This reaction appears to involve unusual electron transfer mechanism in the formation of observed products.
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Jun Kuraki, Mitsunobu Iwasaki, Seishiro Ito
1998 Volume 27 Issue 5 Pages
463-464
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The surrounding fields around cobalt ions in the pore-free inorganic-organic hybrid materials were controlled through coordination bonds by various functional groups directly bonded to the silica framework. Tetrachloro cobalt (II) ion [CoCl
4]
2− was also stabilized for a period of over one month in the pore-free materials, whereas it was gradually transformed to [Co(H
2O)
6]
2+ in the porous ones. The pore volume of the hybrid materials was changed against the methyltrimethoxysilane to total silane ratio.
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Yu Chi, J.B. Bhonsle, Taizoon Canteenwala, Jen-Pang Huang, Jentaie Shi ...
1998 Volume 27 Issue 5 Pages
465-466
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Novel highly water-soluble hexa(sulfobutyl)fullerenes were synthesized via electron reductions of C
60. It showed an enhanced superoxide radical (O
2−·) scavenging activity at a dose level of 100 μM.
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Makoto Shimizu, Asato Morita, Tamotsu Fujisawa
1998 Volume 27 Issue 5 Pages
467-468
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Complete anti-stereoselection has been achieved on the addition of allyl metal reagents to an optically active imine derived from malic acid. The homoallyl amine thus obtained was converted into the known intermediate for the synthesis of (+)-Negamycin in enantiomerically pure form.
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Hao-Yu Shen, Dai-Zheng Liao, Zong-Hui Jiang, Shi-Ping Yan, Bai-Wan Sun ...
1998 Volume 27 Issue 5 Pages
469-470
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A new 3D scaffold-like compound [Mn(4,4′-bipy)(N
3)
2]
n has been synthesized and its structure determined by single-crystal X-ray analysis. The molecular structure consists of a three-dimensional network in which Mn
2+ are linked by EE bridged azido ligands and 4,4′-bipy ligands. Magnetic measurement indicates that the overall magnetic behavior is weakly antiferromagnetic.
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