-
Xiao-Hong Li, Kaoru Fujimoto
1994 Volume 23 Issue 9 Pages
1581-1584
Published: 1994
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Perovskite oxides, SrTiO
3 which was doped with MgO and contained oxygen defects, oxidized methane to C
2 coupled hydrocarbons at 425 °C, with the selectivity over 90%. The used oxides could be regenerated by being treated in air at 425 °C. Adsorbed oxide ion on the defect seemed to be responsible for their oxidation activity.
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Tsunehiro Tanaka, Sakae Takenaka, Takuzo Funabiki, Satohiro Yoshida
1994 Volume 23 Issue 9 Pages
1585-1588
Published: 1994
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The addition of alkali ions (Na, K and Rb) to silica-supported vanadium oxide results in the formation of surface vanadate species which is excited by the light with wavelengths of around 400 nm. Propanone was selectively formed from propane and oxygen over alkali-ion-modified silica-supported vanadium oxides by the photoirradiation of light with wavelengths of λ > 390 nm.
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Ursula Pfeifer-Fukumura, Hiroaki Misawa, Hiroshi Fukumura, Hiroshi Mas ...
1994 Volume 23 Issue 9 Pages
1589-1592
Published: 1994
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Polystyrene microspheres were modified with polar and nonpolar groups. A fluorescent probe with spectral properties sensitive to environments was used to characterize the surface. Using the technique of laser trapping the fluorescence spectrum of the dye could be observed from a single particle dispersed in solution.
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Kiyohiko Nakajima, Masaaki Kojima, Masanobu Tsuchimoto, Yuzo Yoshikawa ...
1994 Volume 23 Issue 9 Pages
1593-1596
Published: 1994
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The isomerization between the two diastereomers of [V
IVO{3-MeOsal,sal-(
RR)-chxn}] (H
2{3-MeOsal,sal-(
RR)-chxn} =
N-salicylidene-
N′-3-methoxysalicylidene-(
RR)-1,2-cyclohexanediamine) in acetonitrile-water(95:5 v/v) was observed under aerobic conditions. The reaction was accelerated by the addition of [V
VO(salen)]ClO
4 (H
2salen =
N,
N′-disalicylidene-1,2-ethanediamine), but the complex did not isomerize in dry acetonitrile. The mechanism of the isomerization was investigated.
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Hirokazu Izumi, Yukitaka Seyama, Ken-ichi Machida, Gin-ya Adachi
1994 Volume 23 Issue 9 Pages
1597-1600
Published: 1994
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Interstitial rare earth carbide (NdFe
10Mo
2C
x) and carbonitride (NdFe
10Mo
2C
xN
y) have been prepared by a novel preparation method, which comprises the replacement of a partial amount of Nd metal with NdC
2 up to the carbon content of x < 1. Temperature dependence of their magnetization characteristics fairly agreed with those of NdFe
10Mo
2C
x and NdFe
10Mo
2C
xN
y obtained by a conventional metallurgical technique and/or a subsequent plasma nitriding. The results demonstrated that these interstitial rare earth compounds are produced in much reduced cost compared with that for the conventional one using Nd metal.
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Koji Iwase, Shogo Sakai, Satoshi Inagaki
1994 Volume 23 Issue 9 Pages
1601-1604
Published: 1994
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Trigonal pyramidal structures of some tricoordinated metal complexes ML
3 (M = Mg, Al, Si) are predicted by an orbital phase theory and confirmed by ab initio molecular orbital calculations to have acute L–M–L angles in spite of the steric congestion.
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Keiki Kishikawa, Isao Tsuru, Shigeo Kohmoto, Makoto Yamamoto, Kazutosh ...
1994 Volume 23 Issue 9 Pages
1605-1606
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Isolable conformers of 2-alkylamino-
N-(2′-alkylphenyl)succinimide were stereoselectively synthesized by amination of
N-(2′-alkylphenyl)maleimides. The rotational barrier and the α-methylation of them were investigated.
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Masaaki Mishima, Hirotaka Nakamura, Kazuhide Nakata, Mizue Fujio, Yuho ...
1994 Volume 23 Issue 9 Pages
1607-1610
Published: 1994
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The gas phase basicities of cis 2-aryl-2-butenes have been determined by measuring proton transfer equilibria. It has been shown that the substituent effect on the stability of the conjugate acid ion of the olefin, α-ethyl-α-methylbenzyl cation, is in complete agreement with that of α-cumyl cation, suggesting that α,α-dialkyl benzyl cations seem likely to be characterized by the r value of 1.0 given by the LArSR analysis.
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Takahiro Oka, Akio Murai
1994 Volume 23 Issue 9 Pages
1611-1614
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The compound with all the necessary functional groups of the KLM ring system in ciguatoxin, which is one of the most complicated toxic substances of marine origin, was synthesized stereoselectively. The crucial steps involve construction of the ethynyl alcohol, the δ-valerolactone, and the natural acetals.
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Emiko Kaneko, Akihiko Ishida, Yuji Deguchi, Takao Yotsuyanagi
1994 Volume 23 Issue 9 Pages
1615-1618
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A new sensitive and simple spot test has been developed for the visual determination of trace element in water, based on the formation of a size confined colored ring on hydrophobic filter paper. When 0.1 cm
3 of aqueous solution is spotted on the water-repelling surface and evaporated in an oven, a small fleck of 6 mm diameter edged with a colored analyte is formed. This method has been successfully applied to the visual fluorometric determination of trace aluminium(III) ion with 2,2′-dihydroxyazobenzene (DHAB or H
2L). The 1 : 1 chelate, [AlL]
+, becomes localized in a concentric ring zone at pH 6.5. The detection limit is 2 × 10
−8 mol dm
−3 (0.5 ppb) by visual fluorometry with a UV lamp in the dark.
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Kazuya Matsuda, Mahito Atobe, Tsutomu Nonaka
1994 Volume 23 Issue 9 Pages
1619-1622
Published: 1994
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Ultrasonic irradiation to electroorganic systems resulted in significant effects on product-selectivity in the reduction of benzaldehydes and others. By the irradiation, the selectivity of reduction products formed by consuming fewer electrons was drastically enhanced. The effects were rationalized as due to not cavitation but agitation of electrolytic solutions by ultrasonic waves.
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Yasushi Ono, Yoshinori Nishiki, Tsutomu Nonaka
1994 Volume 23 Issue 9 Pages
1623-1626
Published: 1994
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A binary type composite plated nickel electrode with poly(tetrafluoroethylene) and silica gel as hydrophobic and hydrophilic components, respectively, was prepared and applied to electroreduction of aldehydes. The electrode gave higher current efficiencies for the reduction and higher selectivities for the corresponding alcohols than unplated and plated electrodes with either poly(tetrafluoroethylene) or silica gel.
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Akihide Itoh, Hiroki Haraguchi
1994 Volume 23 Issue 9 Pages
1627-1630
Published: 1994
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A size exclusion chromatography system with UV absorption detection and simultaneous multielement detection by ICP-AES has been used to elucidate that humic acid forms some large molecules with molecular weight larger than 300000 in aqueous solution, when zinc is added in humic acid solution as the ionic form.
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Toyoaki Ishiwata, Tsutomu Nonaka, Masanobu Umezawa
1994 Volume 23 Issue 9 Pages
1631-1634
Published: 1994
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Organosilyl stannanes were formed by electroreduction of the corresponding organostannyl chlorides or distannanes with silyl chlorides. The Sn-C bond formation was also confirmed in the reduction of a mixture of stannyl and alkyl chlorides.
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Young Seek Yoon, Nobuo Fujikawa, Wataru Ueda, Yoshihiko Moro-Oka
1994 Volume 23 Issue 9 Pages
1635-1636
Published: 1994
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Cobalt molybdates showed high catalytic activities for the oxidative dehydrogenation of propane to propene. Composition of the catalyst strongly affects surface acidic properties, resulting in a drastic activity change. Co
0.95 MoO
4 calcined at 550 °C showed the highest catalytic performance, giving 60% selectivity to propene at 19% conversion of propane.
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Eiji Wada, Hiroshi Yasuoka, Shuji Kanemasa
1994 Volume 23 Issue 9 Pages
1637-1640
Published: 1994
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(
E)-2-Oxo-1-phenylsulfonyl-3-alkenes are effectively activated with the aid of a catalytic amount of chiral titanium reagents in hetero Diels-Alder reactions with vinyl ethers to produce (2
R,4
R) or (2
R,4
S)-2,4-
cis-2-alkoxy-4-substituted-3,4-dihydro-2
H-pyrans in highly endo- and enantioselective manners. The resulting cycloadducts are transformed to 5-substituted (5
R)-2-phenylsulfonyl-2-cyclohexen-1-ones which are useful as new chiral building blocks.
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Atsushi Fukuoka, Akihiro Sato, Yuji Mizuho, Masafumi Hirano, Sanshiro ...
1994 Volume 23 Issue 9 Pages
1641-1644
Published: 1994
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Novel mono- and dinuclear organo(siloxo)platinum complexes PtR(OSiPh
3)(cod) (R = Me, Ph) and [{PtMe(cod)O}Ph
2Si]
2O have been prepared and characterized. The molecular structure of PtPh(OSiPh
3)(cod) has been determined by X-ray structure analysis. The activity for reduction of PtMe(OSiPh
3)(cod) and PtMe(OPh)(cod) by H
2 is higher than that of PtMe
2(cod).
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Masayuki Morita, Hironari Takase, Masashi Ishikawa, Yoshiharu Matsuda
1994 Volume 23 Issue 9 Pages
1645-1648
Published: 1994
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Poly(2,5-dihydroxyaniline) films, synthesized by electropolymerization of 2,5-dimethoxyaniline followed by hydrolysis of methoxy groups in an acidic solution, gave a characteristic redox response like a hydroquinone/quinone couple in aqueous electrolyte solutions. The film showed electrocatalysis for a simple redox system.
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Masa-aki Sato, Masao Hiroi
1994 Volume 23 Issue 9 Pages
1649-1652
Published: 1994
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Hexyl-substituted oligothiophenes (sexi-, novi-, duodeci-, and quindecithiophenes) were oxidized with two equivalents of FeCl
3 in dichloromethane. The visible-near IR and ESR spectra of the solutions showed that oxidized species in the oligothiophenes were cation radicals and were spread over thiophene rings between 6 and 8. The absorption spectra of the solutions were similar to those of poly[3-(long alkyl)thiophenes] in oxidized states in solution.
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Yohji Misaki, Hideki Fujiwara, Tokio Yamabe, Takehiko Mori, Hatsumi Mo ...
1994 Volume 23 Issue 9 Pages
1653-1656
Published: 1994
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Many cation radical salts of BDT-TTP (2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) showed metallic conducting behavior down to 0.6–1.2 K. X-Ray crystal structure analysis of (BDT-TTP)
2SbF
6 revealed that this salt has a two-dimensional “β-type” arrangement of donor molecules in the conducting sheet.
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Yukito Murakami, Yoshio Hisaeda, Akihiro Ogawa, Teruhisa Ohno
1994 Volume 23 Issue 9 Pages
1657-1660
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An alkyl ligand coordinated to hydrophobic vitamin B
12 derivatives covalently bound to
N,
N-dihexadecyl-
Nα-[6-(trimethylammonio)hexanoyl]-
L-aspartamide bromide underwent a novel bromination reaction along with its rearrangement in the single-walled vesicle of
N,
N-dihexadecyl-
Nα-[6-(trimethylammonio)hexanoyl]-
L-alaninamide bromide under photolysis conditions.
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Takanori Nishioka, Kiyoshi Isobe
1994 Volume 23 Issue 9 Pages
1661-1664
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Reaction of [MCp
*(NCMe)
3]
2+ (M = Rh, Ir; Cp
* = η
5-C
5Me
5) with Na
2S in MeCN affords [(MCp
*)
3(μ
3-S)
2]
2+. X-Ray structural characterization of their BF
4 salts shows that they have equilateral triangle M
3 core with two triply bridging sulfido ligands on both sides of the M
3 plane. Cyclic voltammograms of the rhodium and iridium complexes in MeCN show three and two chemically reversible processes, respectively.
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Sonae Kotani, Tsuneyoshi Tanizawa, Tomohiro Adachi, Toshikatsu Yoshida ...
1994 Volume 23 Issue 9 Pages
1665-1668
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The reaction between equimolar amounts of 1,1′-bis(dimethylsilyl)ferrocene (
3) and trirutheniumdodecacarbonyl afforded dihydrido triruthenium cluster (
4) having an edge-bridge by a 1,1′-ferrocenediyl bis(dimethylsilylene) chelate ligand. This complex was identified by a combination of spectroscopic and X-ray methods. Crystal data for
4: monoclinic, space group
C2/
c,
a = 13.567(4) Å,
b = 15.871(3) Å,
c = 15.195(5) Å, β = 110.24(2)°,
V = 3069(2) Å
3,
Z = 4 and
R(
Rw) = 0.041(0.044).
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Minoru Inaba, Yumi Osa, Takeshi Yao, Zempachi Ogumi
1994 Volume 23 Issue 9 Pages
1669-1672
Published: 1994
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The structure of perfluorinated ionomer membranes (Nafion
®) incorporating large organic cations, tetraethylammonium (TEA
+) and 1,1′-dialkyl-4,4′-bipyridinium cations (C
nV
2+, n = 3 and 8), is studied using small-angle X-ray scattering (SAXS). For TEA
+- and C
3V
2+-form membranes, the SAXS maxima show the presence of the ionic clusters as large as those for Na
+-form (ca. 4 nm in diameter). For C
8V
2+-form membranes, the intercluster distance expanded to a value larger than that for H
+-form after the ion-exchange reaction for 5 days. However, the water content and cluster size decreased significantly after the ion-exchange reaction for 50 days or boiling treatment.
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Hiroyuki Suga, Xiaolan Shi, Toshikazu Ibata
1994 Volume 23 Issue 9 Pages
1673-1676
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Tin(IV) chloride-catalyzed formal [3 + 2] cycloadditions of 5-alkoxy-2-(
p-methoxyphenyl)- or 2-phenyloxazoles with diethyl oxomalonate gave 2-oxazoline-4,5,5-tricarboxylates in high regioselectivity. 4-Substituted 5-alkoxy-2-methyloxazoles showed a trend to shift the regioselectivity to offer more 3-oxazoline-2,5,5-tricarboxylates in terms of regioselectivity than 2-oxazolines.
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Takahisa Machiguchi
1994 Volume 23 Issue 9 Pages
1677-1678
Published: 1994
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Deuterium tracer experiment clarifies that the condensation reaction of 2,3-benzotropone with malononitrile forms 8,8-dicyano-2,3-benzoheptafulvene via reaction paths involving the preference of an abnormal (Michael type) attack of the nucleophile at the C-4 position to a normal (Knoevenagel type) attack at the C-1 position.
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Shigeaki Nimura, Osamu Kikuchi, Tsuguyori OHANA, Akira Yabe, Masahiro ...
1994 Volume 23 Issue 9 Pages
1679-1682
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In photolysis of 4,4′-diazidodiphenyl sulfide quintet ESR peaks were observed and the plots of these signal intensities vs. temperature obeyed the Curie law, although no quintet signals were observed in the photolysis of 4,4′-diazidodiphenyl ether. The ESR spectrum upon the irradiation of 3,4′-diazidodiphenyl sulfide showed quintet resonances of 3,4′-dinitrenodiphenyl sulfide. Both Curie analysis and PM3-CI calculations indicated that the quintet state is a ground-state.
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Osamu Yagi, Shumpei Shimizu
1994 Volume 23 Issue 9 Pages
1683-1686
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Tetramethylammonium hydroxide (TMAH) of high quality without corrosive ions were prepared by the electrolysis of the solution containing tetramethylammonium hydrogencarbonate (TMAC). Current efficiency varies by the anion of the tetramethylammonium salts and best with hydrogencarbonate among sulfate, chloride, and formate salts.
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Hiroshi Uyama, Shiro Kobayashi
1994 Volume 23 Issue 9 Pages
1687-1690
Published: 1994
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Enzymatic polymerization of divinyl adipate with four glycols was carried out catalyzed by three kinds of lipase. The polymerization with 1,4-butanediol by
Pseudomonas fluorescens lipase in
i-propyl ether at 45 °C for 48 h produced a corresponding polyester with molecular weight of 6700 in 50% yield. With ethylene glycol, 1,6-hexanediol or 1,10-decanediol as a glycol, the corresponding polyester was also obtained, however, its molecular weight decreased, compared with that of 1,4-butanediol.
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Mao Minoura, Takayuki Kawashima, Renji Okazaki
1994 Volume 23 Issue 9 Pages
1691-1692
Published: 1994
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A novel tellurium containing heterocycle, 1,4,2-oxatellurazole, was characterized by X-ray crystallographic analysis which showed a remarkably small C-Te-C bond angle (79.4°), and its thermolysis afforded the corresponding ketone and isonitrile derived from an intermediary isotellurocyanate in a manner of 1,3-dipolar cycloreversion.
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Yoichiro Ishimaru, Katsuya Inoue, Noboru Koga, Hiizu Iwamura
1994 Volume 23 Issue 9 Pages
1693-1696
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X-Ray analyses revealed that bis(hexafluoroacetylacetonato)manganese(II) forms with 1-[3- and 4-(
N-
tert-butyl-
N-oxyaminophenyl)]imidazoles cyclic dimer complexes in
cis coordination. The long-range magnetic couplings between the two spin 4/2’s resulting from the strongly antiferromagnetic short-range interaction between the Mn(II) and the ligated nitroxide radical are regiospecific: antiferromagnetic for 3- and ferromagnetic for 4-nitroxide substitution on the phenyl ring.
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Nobuharu Iwasawa, Masahiro Funahashi, Koichi Narasaka
1994 Volume 23 Issue 9 Pages
1697-1700
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Total synthesis of a unique isothiocyano sesquiterpene, 10-isothiocyanatoguaia-6-ene, was achieved utilizing the oxidative radical cyclization reaction of a bicyclo[4.1.0]heptanol derivative with Mn(pic)
3 as the key step.
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Jun-ichi Kikuchi, Zhi-Yi Zhang, Tetsuya Miyajima, Yukito Murakami
1994 Volume 23 Issue 9 Pages
1701-1704
Published: 1994
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A supramolecular bilayer assembly, composed of a cationic peptide lipid having an (
S)-alanine residue, an additional one having an (
S)-binaphthol moiety, a hydrophobic pyridoxamine derivative, and copper(II) ions, performed substrate-selective catalysis as a vitamin B
6-dependent artificial aminotransferase to transform α-keto acids into the corresponding α-amino acids in an enantiomeric excess of the
D-isomer.
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Koichi Narasaka, Takashi Mochizuki, Satoshi Hayakawa
1994 Volume 23 Issue 9 Pages
1705-1708
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Sodium arylsulfinates are treated with manganese(III) 2-pyridinecarboxylate or cerium(IV) tetrabutylammonium nitrate to generate sulfonyl radicals, which react with various olefins giving the addition products.
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Takakazu Yamamoto, Takaki Kanbara, Naoki Ooba, Satoru Tomaru
1994 Volume 23 Issue 9 Pages
1709-1712
Published: 1994
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Palladium-catalyzed polycondensation between 2,5-bis(trimethylstannyl)thiophene and 5,8-dibromoquinoxaline derivatives gives soluble new π-conjugated polymers, which exhibit absorption bands at 575 ± 30 nm assignable to intramolecular charge transfer bands and show the three-photon resonant third-order nonlinear optical susceptibility χ
(3) of about 5 × 10
−11 esu.
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Yoshinori Naruta, Nobuyuki Sawada, Makoto Tadokoro
1994 Volume 23 Issue 9 Pages
1713-1716
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1,8-Anthracene- and
o-phenylene-linked iron(III) porphyrin dimers and the trimer were synthesized. Their Fe(III) ions were ligated by imidazolate(s) in the molecular creft to form the corresponding low-spin complexes. Relatively large imidazolate-mediated antiferromagnetic exchange coupling (−
J = 15.3–29.4 cm
−1) between the Fe(III) ions is observed by means of their esr and magnetic susceptibility measurements.
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Ichiro Yamanaka, Katsumi Nakagaki, Takashi Akimoto, Kiyoshi Otsuka
1994 Volume 23 Issue 9 Pages
1717-1720
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EuCl
3 dissolved in a mixture of propanoic acid and 1,2-dichloroethane catalyzed the epoxidation of 1-hexene (81.4% selectivity, 5.34% yield for 1 h) with O
2 in the presence of Zn powder at 40 °C. The epoxidation was also catalyzed by LaCl
3 (0.75% yield) and SmCl
3 (0.57% yield), but CeCl
3 (0.08% yield) was inactive. Epoxidations of styrene and cyclohexene were also promoted by the EuCl
3-catalytic system.
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Munenori Nakagawa, Kazunori Hanaoka, Akira Terasaki, Yutaka Mori, Hide ...
1994 Volume 23 Issue 9 Pages
1721-1724
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The catalytic mechanism of the superoxide dismutase-like activity catalyzed by Fe(II)-
N,
N,
N′,
N′-tetrakis(2-pyridylmethyl)-
trans-1,2-cyclohexanediamine ([Fe(II)(TPCN)]) was studied in aqueous solution. Addition of KO
2 solution was employed as superoxide (O
2−) generation systems to decipher the changes in UV-Visible spectra of [Fe(TPCN)] upon the reaction with O
2−. It was indicated that [Fe(TPCN)]catalyzed the disproportionation of O
2− through the redox cycle of [Fe(II)/(III)(TPCN)].
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Reiko Hinogami, Tomohiro Mori, Shinji Yae, Yoshihiro Nakato
1994 Volume 23 Issue 9 Pages
1725-1728
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The photoelectrochemical reduction of CO
2 was performed with p-type silicon (p-Si) electrodes modified with very small Cu particles. Hydrocarbons such as methane and ethylene were produced together with CO and HCOOH similar to the case of a Cu-metal electrode, but at potentials ca. 0.4 V more positive than the Cu-metal electrode, clearly showing that the photovoltage generated in the p-Si is effectively utilized for the CO
2 reduction. On the contrary, p-Si electrodes coated with continuous Cu layers as well as naked p-Si electrodes showed no such photo-shifts in potential.
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Seiichi Inokuma, Kaori Hasegawa, Shigefumi Sakai, Jun Nishimura
1994 Volume 23 Issue 9 Pages
1729-1732
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The compounds possessing two aminimide groups directly attached to each other showed moderate affinity toward heavy- and transition metal cations on the liquid-liquid extraction. It is thought that this takes the five membered ring chelation which results in high lipophilic complexations to extract the cations into the organic phase.
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Hideyuki Kurosawa, Yongtie Yan, Norio Miura, Noboru Yamazoe
1994 Volume 23 Issue 9 Pages
1733-1736
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An electrochemical device fabricated by combining an MgO-stabilized zirconia (MSZ) tube and a coating layer of Ba(NO
3)
2 (auxiliary phase) was found to exhibit fairly good Nernstian response to dilute NO
2 in air at elevated temperature (450 °C). The response to NO, which was far less satisfactory with the above device, could be much improved by the use of a binary system of Ba(NO
3)
2-CaCO
3 for the coating layer.
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Fred Lisdat, Norio Miura, Noboru Yamazoe
1994 Volume 23 Issue 9 Pages
1737-1740
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A potentiometric glucose sensor applicable for flow-trough-measurements was developed. The sensor can be represented by the following electrochemical scheme: Reference layer (Ag/AgCl) / NASICON / Pt, enzyme layer (GOD). The response to glucose was found to be reversible with a 90% response time of 50–90 s and a sensitivity of −55 ± 2 mV/dec. The stability of the internal reference contact as well as the reproducibility of the sensor signal were investigated. The compact sensor design allows easy replacement of the sensor within a flow-through-system.
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Norikazu Nakamura, Shinichi Wakabayashi, Keiichi Miyairi, Tsuneo Fujii
1994 Volume 23 Issue 9 Pages
1741-1742
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A new organozinc compound, zinc bis-2-(o-hydroxyphenyl)benzoxazolate, was prepared from 2-(o-hydroxyphenyl)benzoxazole and electroluminescent properties of the compound was investigated. An electroluminescent device was composed of glass substrate/indium-tin-oxide/hole transporting layer/zinc benzoxazolate/Al thin films. The electroluminescence of blue light was observed with the electric field of over 90 MV/m.
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Kazuaki Shimada, Satoru Akimoto, Hideki Itoh, Hidenori Nakamura, Yuji ...
1994 Volume 23 Issue 9 Pages
1743-1746
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[3,3] Sigmatropic rearrangement of alkynyl propargyl selenides in the presence of an excess amount of Et
2NH afforded
N,N-diethyl-2,4-pentadieneselenoamides in modest yields.
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Yasuharu Ishibashi, Shigeru Nishiyama, Shosuke Yamamura
1994 Volume 23 Issue 9 Pages
1747-1748
Published: 1994
Released on J-STAGE: April 25, 2006
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Biologically active griseulin isolated from
Streptomyces sp. was synthesized, however the spectral data of the synthetic sample did not agree with the reported one. Synthesis of the related sample and detailed reexamination of the spectroscopic properties resulted in the structural revision of griseulin, which should be identical with luteoreticulin.
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Takashi Hayashi, Takashi Miyahara, Yasunori Aoyama, Masanori Nonoguchi ...
1994 Volume 23 Issue 9 Pages
1749-1752
Published: 1994
Released on J-STAGE: April 25, 2006
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αααα-
meso-Tetra(7-hydroxy-1-naphthyl)porphyrin (
1) is prepared as a host molecule for ubiquinone analogue, 2,3,5,6-tetramethoxy-
p-benzoquinone (
2). The affinity and thermodynamic aspects in porphyrin
1- quinone
2 pairing were determined by titrimetric measurement of electronic absorption and fluorescence spectra. The binding constant of
1 for
2 at 298 K is obtained;
Ka = 7.9 × 10
2 M
−1 in toluene. The fashion of this porphyrin-quinone pairing was large different from that of previous host, αααα-
meso-tetra(2-hydroxy-1-naphthyl)porphyrin (
3), -quinone
2 pairing.
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Yongtie Yan, Norio Miura, Noboru Yamazoe
1994 Volume 23 Issue 9 Pages
1753-1756
Published: 1994
Released on J-STAGE: April 25, 2006
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A solid-state electrochemical device based on Y
2O
3-stabilized zirconia was found to respond well to 0.6–12 ppm H
2S in air at 400 °C, when its surface exposed to H
2S was coated with a layer of WO
3. EMF decreased with an increase in H
2S concentration at a rate of −40 mV/decade. It is proposed that in this device WO
3 acts as a semiconductor electrode, its mixed potential being determined by the electrode reactions taking place at the zirconia/WO
3 interface.
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Yoo Tanabe, Yoshinori Nishii, Ken-ichi Wakimura
1994 Volume 23 Issue 9 Pages
1757-1760
Published: 1994
Released on J-STAGE: April 25, 2006
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Various
gem-dihalocyclopropyl substituted alkenes and alkynes were transformed into the corresponding bicyclo[3.1.0]- or [4.1.0] compounds with high regioselectivity through a reductive radical cyclization using tributyltin hydride in the presence of catalytic azobisisobutyronitrile (AIBN).
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Ke Zhi Wang, Wei Jiang, Chun Hui Huang, Guang Xian Xu, Ling Ge Xu, Tia ...
1994 Volume 23 Issue 9 Pages
1761-1764
Published: 1994
Released on J-STAGE: April 25, 2006
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The LB films of four hemicyanine salts with rare earth complex anions were prepared. From second-harmonic generation experiments, the second-order molecular hyperpolarizability β was evaluated to be about 2 × 10
−27e. s. u. Enhanced second-order nonlinearity compared with the hemicyanine bromide was discussed according to the crystal structure of a model complex. The results of UV-Vis, IR and low angle X-ray diffraction for the LB films are also reported.
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Kenji Matsuda, Nobuo Nakamura, Hiizu Iwamura
1994 Volume 23 Issue 9 Pages
1765-1768
Published: 1994
Released on J-STAGE: April 25, 2006
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A variety of benzoylacetylenes are trimerized to give the corresponding 1,3,5-tribenzoylbenzenes when heated with a catalytic amount of diethylamine. A large amount of diethylamine gives γ-(diethylamino)propenoylbenzene at the expense of 1,3,5-tribenzoylbenzene, verifying a Michael-addition/trimerization/elimination-type mechanism for the formation of the benzene ring.
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