-
Jun Kawamata, Kuon Inoue
1993 Volume 22 Issue 6 Pages
921-924
Published: 1993
Released: March 22, 2006
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A series of 3-benzylidene-
D-camphor derivatives has been synthesized in order to examine the second-harmonic generation (SHG) efficiency along with the transparent wavelength region. Through reflection powder measurement, 3-cinnamylidene-
D-camphor having a cutoff wavelength of 350 nm, shows the efficiency 10 times as large as that of urea.
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Yoh-ichi Matsusita, Kazuhiro Sugamoto, Takanao Matsui
1993 Volume 22 Issue 6 Pages
925-928
Published: 1993
Released: March 22, 2006
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Various aromatic olefins and acrylic acid derivatives were converted to benzyl alcohols and α-hydroxyalkanoic acid derivatives in good yields by the reductive oxygenation with oxygen and triethylsilane in the presence of a catalytic amount of cobalt(II) porphyrin followed by treating the reaction mixture with trimethyl phosphite.
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Masaaki Miyashita, Masayuki Matsushita, Hideaki Sato, Takashi Toki, Te ...
1993 Volume 22 Issue 6 Pages
929-932
Published: 1993
Released: March 22, 2006
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The first synthesis of Nephilatoxin-8 (NPTX-8), a new neurotoxin of Joro spider (Nephila clavata), has been achieved by employing two key azide intermediates for the incorporation of the characteristic polyamines of the toxin, cadaverine and spermidine.
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Yoshikazu Sugihara, Ryuta Miyatake, Toshiyasu Yagi
1993 Volume 22 Issue 6 Pages
933-936
Published: 1993
Released: March 22, 2006
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In order to obtain an insight into the electronic states in connection with the condensation modes of thiophene and borepin rings, we examined 1-phenylthieno[2,3-
d]borepin (
2). While 1-phenylthieno[3,4-
d]borepin is a peripherally conjugated compound,
2 was shown to be an aromatic compound which maintains characteristics in conjugation of individual rings.
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Tadashi Sato, Kazutaka Tachibana, Akira Kawase, Tomokazu Hirose
1993 Volume 22 Issue 6 Pages
937-940
Published: 1993
Released: March 22, 2006
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γ-Trialkylstannyl ketones underwent cyclobutanation, C-C bond cleavage, or 1,5-hydride shift, depending upon the substitution pattern of the substrates.
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Nobuo Kimizuka, Tadashi Maeda, Izumi Ichinose, Toyoki Kunitake
1993 Volume 22 Issue 6 Pages
941-944
Published: 1993
Released: March 22, 2006
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Anionic lead halide clusters of PbBr
42− were synthesized at the interlayer space of cationic multibilayer cast films either by the co-casting method or by the ion-exchange method. Marked blue shifts in exciton absorption spectra indicated the formation of dimension-diminished clusters and their two dimensional assembly.
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Masahiro Mikuriya, Takanori Kotera, Fumiya Adachi, Shunji Bandow
1993 Volume 22 Issue 6 Pages
945-948
Published: 1993
Released: March 22, 2006
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A mixed-valence tetranuclear vanadium(III, III, IV, IV) complex, [V
2(VO)
2(acac)
4(CH
3O)
6] (Hacac = acetylacetone), has been isolated by a reaction of VO(acac)
2 with 2-(3-aminopropylamino)ethanethiol in methanol-dichloromethane. The complex has been characterized by X-ray structure analysis, XPS and electronic spectra, and magnetic susceptibilities (80–300 K).
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Atsuhiro Osuka, Ben-li Liu, Kazuhiro Maruyama
1993 Volume 22 Issue 6 Pages
949-952
Published: 1993
Released: March 22, 2006
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Trichloroacetic acid catalyzed condensation of an aldehyde carrying more than two formyl groups and 3,5-di-tert-butylbenzaldehyde with bis(3-ethyl-4-methyl-2-pyrrolyl)-methane in acetonitrile followed by p-chloranil oxidation gave oligomeric porphyrins in good yield via multiple porphyrin-cyclization.
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Chikao Hashimoto, Ichiro Muramatsu
1993 Volume 22 Issue 6 Pages
953-954
Published: 1993
Released: March 22, 2006
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The binding of heme to sperm whale myoglobin-(57–96)-tetracontapeptide (
1) was investigated. The appearance of a peak at 414 nm in the difference spectrum between a
1–heme mixture and heme indicated the formation of a complex. The circular dichroism spectrum of the mixture showed that an α-helical structure is induced and stabilized by the formation of the complex.
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Hirotaka Nagao, Tetsunori Mizukawa, Koji Tanaka
1993 Volume 22 Issue 6 Pages
955-958
Published: 1993
Released: March 22, 2006
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Controlled potential electrolysis of [Ru(bpy)(trpy)(CO)]
2+ (bpy = 2,2′-bipyridine; trpy = 2,2′:6′,2″-terpyridine) at −1.70 V
vs. Ag|Ag
+ in CO
2-saturated C
2H
5OH/H
2O (8:2v/v) at −20 °C produced not only HCOOH and CO but also HC(O)H, CH
3OH, H(O)CCOOH, and HOCH
2COOH.
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Norikazu Miyoshi, Seiji Takeuchi, Yoshiaki Ohgo
1993 Volume 22 Issue 6 Pages
959-962
Published: 1993
Released: April 27, 2006
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In the presence of samarium diiodide, 1,2-diketones react with aldehydes to afford the corresponding 2,3-dihydroxyketones in good yields with moderate diastereoselectivity. The reaction of unsymmetrical 1,2-diketones with aldehydes gives the products with high regioselectivities.
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Kounosuke Uozumi, Yoshihito Hayashi, Masatatsu Suzuki, Akira Uehara
1993 Volume 22 Issue 6 Pages
963-966
Published: 1993
Released: April 27, 2006
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Reactivity of copper(I) complexes [Cu(L)]
+ containing a series of tetradentate tripodal ligands, (6-methyl-2-pyridylmethyl)
m(2-pyridylmethyl)
(3−m)amine (m = 1, 2, or 3) with molecular oxygen was investigated in acetone at −70 °C. It was found that the introduction of 6-methyl group(s) into pyridyl group(s) has significant influences on the stereochemistry and thermal stability of peroxo dicopper(II) complexes.
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Ming-hua Liu, Hiroo Nakahara, Yoshio Shibasaki, Kiyoshige Fukuda
1993 Volume 22 Issue 6 Pages
967-970
Published: 1993
Released: April 27, 2006
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Polycondensation of octadecyl esters of aromatic amino acids (L-TrpC18, L-TyrC18, L-PheC18) can be markedly accelerated in the monolayers on the aqueous subphase of pH 8. The reaction rate was ten times or more faster than in the bulk solid. There exist optimum molecular packing and orientation for the polycondensation. The resultant poly-ammo acids take α-helix and/or random coil conformations.
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Chikara Uchida, Tatsuya Yamagishi, Seiichiro Ogawa
1993 Volume 22 Issue 6 Pages
971-974
Published: 1993
Released: April 27, 2006
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Complete synthesis of both diastereoisomeric structures, initially proposed for the trehalase inhibitor trehalostatin, and their biological assay have been carried out. The synthetic compounds were found to lack an inhibitory activity against trehalase, suggesting that the inhibitor would possess convincingly its 4′-epimeric structure later assigned for trehazolin.
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Hiroshi Ohno, Atsunori Mori, Shohei Inoue
1993 Volume 22 Issue 6 Pages
975-978
Published: 1993
Released: April 27, 2006
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Ring opening of epoxide and aziridine with acetone cyanohydrin is promoted by a catalytic amount of lanthanoid(III) alkoxide to provide β-hydroxy nitrile and β-amino nitrile, respectively.
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Masanobu Kojima, Akito Ishida, Setsuo Takamuku
1993 Volume 22 Issue 6 Pages
979-982
Published: 1993
Released: April 27, 2006
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Selective excitation of the contact charge transfer band between 1,1-diarylethene and oxygen in dichloromethane and acetonitrile gave 3,3,6,6-tetraaryl-1,2-dioxane and benzophenone derivative through an electron transfer reaction. The proposed mechanism was confirmed by the direct observation of the dimer cation radical of the olefin trapped by a triplet oxygen in pulse radiolysis.
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Tomoyuki Ogata, Kunizo Hiranaga, Shinjiro Matsuoka, Yuji Wada, Shozo Y ...
1993 Volume 22 Issue 6 Pages
983-984
Published: 1993
Released: April 27, 2006
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Photoreductive fixation of CO
2 into benzophenone can be achieved in a CO
2-saturated DMF solution by using poly(
p-phenylene) as a heterogeneous photocatalyst and triethylamine as an electron donor. The presence of quaternary ammonium salts increases the yield of benzilic acid as a CO
2-photofixed product from benzophenone.
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Takahiro Kusukawa, Yoshio Kabe, Wataru Ando
1993 Volume 22 Issue 6 Pages
985-988
Published: 1993
Released: April 27, 2006
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Peralkylated 3,4-bis(alkylidene)-1,2-disilacyclobutanes prepared by convenient synthetic route were quantitatively converted to 3,4,7,8-tetrakis(alkylidene)-1,2,5,6-tetrasilacyclooctane (twist and chair 1:1 mixture) by Pd-catalyzed reaction. In the presence of unsaturated compounds, this disilane metathesis reaction was inhibited to give double silylation products. The reaction pathways are highly dependent upon electronic factors of unsaturated compounds and the catalyst.
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Makoto Iwai, Hiroshi Shoji, Shogo Shimazu, Takayoshi Uematsu
1993 Volume 22 Issue 6 Pages
989-992
Published: 1993
Released: April 27, 2006
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Asymmetrically modified hectorites (HTs) were prepared by the cation exchange method with (R)- and (S)-1-arylethylammonium (aryl = phenyl,
p-tolyl, and 1-naphthyl). Enantioselective entrapment of 1-phenylethylamine with the modified HTs was observed.
In situ X-ray diffraction measurements confirmed that the asymmetric recognition occurred in the interlayer of the modified HT.
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Yutaka Ozaki, Ayako Kubo, Sang-Won Kim
1993 Volume 22 Issue 6 Pages
993-994
Published: 1993
Released: April 27, 2006
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Cyclic enones were obtained from the reactions of β-keto esters with acyclic α,β-unsaturated ketones by using lithium chloride in hexamethylphosphoramide. The products were brought about
via the Michael addition, decarboxylation, and the aldol condensation.
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Manabu Tokeshi, Keiji Nakashima, Teiichiro Ogawa
1993 Volume 22 Issue 6 Pages
995-996
Published: 1993
Released: April 27, 2006
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Emission spectra of the CH(A
2Δ-X
2Π) transition produced in the electron impact dissociation of acethylene have been measured. The rovibrational distributions of CH(A
2Δ) depend on the electron impact energy; the rotational temperature of CH(A
2Δ, v′ = 0) varied from 3200 K at 17 eV to 2500 K at 100 eV, and the ratio of the vibrational populations (P(v′ = 1)/P(v′ = 0)) varied from 0.45 at 17 eV to 0.80 at 100 eV.
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Nobuharu Iwasawa, Takeshi Matsuo
1993 Volume 22 Issue 6 Pages
997-1000
Published: 1993
Released: April 27, 2006
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The rearrangement of 1-(1-alkynyl)cyclopropanols is catalyzed efficiently by the combined use of octacarbonyldicobalt and triphenylphosphite to give 3-substituted 2-cyclopentenones in high yields.
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Tamotsu Takahashi, Zhenfeng Xi, Christophe J. Rousset, Noriyuki Suzuki
1993 Volume 22 Issue 6 Pages
1001-1004
Published: 1993
Released: April 27, 2006
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When ethylene and alkynes such as 4-octyne and diphenylacetylene were treated with Cp
2ZrBu
2 highly pair selective coupling products were formed in high yields. Similarly, styrene or trimethylvinylsilane also afforded cross coupling products with alkynes on zirconocene complex.
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Tsutomu Miyata, Kazuyuki Nakata, Yoshinori Yamaoka, Yuki Taniguchi, Ke ...
1993 Volume 22 Issue 6 Pages
1005-1008
Published: 1993
Released: April 27, 2006
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Propane reacts with CO leading to isobutyric and butyric acids in good yields by the Pd(OAc)
2/Cu(OAc)
2/K
2S
2O
8 catalyst system via C–H bond activation. It is essential to use more than unity of the Cu(OAc)
2/Pd(OAc)
2 ratio to attain high yield.
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Morio Yashiro, Tomonori Mori, Sadao Yoshikawa, Shinsaku Shiraishi
1993 Volume 22 Issue 6 Pages
1009-1012
Published: 1993
Released: April 27, 2006
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Ethylenediaminetetraacetatocobaltate(III) is converted to aqua(ethylenediamine-
N,
N,
N′-triacetate)cobalt(III) selectively in a 1 mol dm
−3 K
2CO
3 aqueous solution at room temperature in the presence of PbO
2. This reaction could be a simple and versatile procedure to obtain ed3a-type ligands.
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Reiji Ihara, Yukihiro Esaka, Akio Hirose, Hiroki Haraguchi
1993 Volume 22 Issue 6 Pages
1013-1016
Published: 1993
Released: April 27, 2006
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A dual-times detection system in size exclusion chromatography was developed for carboxypeptidase A assay. In the system the enzymatic activity was detected 2 times by circulating the sample solution (mobile phase) in a reaction tube through a fluorescence detector.
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Akihide Itoh, Masahide Aikawa, Hideyuki Sawatari, Akio Hirose, Hiroki ...
1993 Volume 22 Issue 6 Pages
1017-1020
Published: 1993
Released: April 27, 2006
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The concentrated large molecules in pond water were separated by size exclusion chromatography, where organic molecules and trace metals were on-line detected by UV absorption and ICP-AES, respectively. It was found that some metal ions combined with large molecular substances of molecular weight larger than 10000.
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Naotoshi Nakashima, Kazuhiro Abe, Toshiaki Hirohashi, Keiko Hamada, Ma ...
1993 Volume 22 Issue 6 Pages
1021-1024
Published: 1993
Released: April 27, 2006
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Cytochrome
c was found to undergo electron transfer reactions at a gold electrode modified with a Langmuir-Blodgett monolayer of 20-mercaptoeicosane-1-ol/dioleoyl-L-α-phosphatidylcholine (molar ratio, 1/20). The stability of the monolayer and the adsorption behavior of cytochrome
c to the monolayer was also examined.
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Shunichi Fukuzumi, Morifumi Fujita, Souta Noura, Junzo Otera
1993 Volume 22 Issue 6 Pages
1025-1028
Published: 1993
Released: April 27, 2006
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Various NAD
+ analogues are reduced regioselectively by ketene silyl acetals to afford the corresponding 2-, 6-, or 4-alkylated NADH analogues. The regioselectivity of the 1,2- (or 1,6-)
vs. 1,4-reduction is finely controlled by the β-methyl-substitution of ketene silyl acetals, the position of methyl-substitution of NAD
+ analogues, and the addition of Et
4NCl or Bu
4NF.
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Yuko Yamashoji, Manabu Fujiwara, Takayuki Matsushita, Minoru Tanaka
1993 Volume 22 Issue 6 Pages
1029-1032
Published: 1993
Released: April 27, 2006
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The line-broadening of
81Br NMR signals observed in the presence of CyDs was applied to evaluate their binding abilities toward inorganic anions in aqueous solutions. The apparent association constants of α -CyD with anions have been found to decrease in the order SCN
− > ClO
4− > I
− > NO
3− > Br
− F
− > Cl
−.
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Masashi Kunitake, Kengo Kotoo, Osamu Manabe, Tsuyoshi Muramatsu, Naoto ...
1993 Volume 22 Issue 6 Pages
1033-1036
Published: 1993
Released: April 27, 2006
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A rotaxane, in which a stilbene moiety threads the cavity of β-cyclodextrin (β-CyD), has been synthesized. The rotaxane structure has been proved by uv-visible and induced circular dichlorism (CD) spectra.
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Md. Azhar Uddin, Takayuki Komatsu, Tatsuaki Yashima
1993 Volume 22 Issue 6 Pages
1037-1038
Published: 1993
Released: April 27, 2006
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The catalytic properties of MFI-type ferrisilicate for the oxidative dehydrogenation of n-butane were compared with those of iron-oxide impregnated silicalite (FeO
x/Sil) and Fe
3+ exchanged ZSM-5 (FeZSM-5). The framework Fe
3+ in ferrisilicate showed much higher dehydrogenation selectivity than Fe
3+ in FeO
X/Sil and FeZSM-5.
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Hiromichi Aono, Eisuke Sugimoto, Yoshiaki Mori, Yasuhiro Okajima
1993 Volume 22 Issue 6 Pages
1039-1042
Published: 1993
Released: April 27, 2006
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The Cl
2 gas sensor using 0.97BaCl
2–0.03KCl solid electrolyte and an Ag metal reference electrode was prepared by a melting method. The melting method has the advantage of ease for the sensor preparation. The sensor probe obtained has a high mechanical strength. The measured EMF agreed with the calculated one for Cl
2 gas concentrations from 50 ppm to 10000 ppm.
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Hiroo Toi, Yoshiro Nagai, Yasuhiro Aoyama, Hirofumi Kawabe, Katsuo Aiz ...
1993 Volume 22 Issue 6 Pages
1043-1046
Published: 1993
Released: April 27, 2006
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Tetra- and disubstituted porphyrins with
p-dihydroxyborylphenyl groups on their meso-positions have been prepared as BNCT target compounds. The resulting porphyrins were solubilized upon formation of sugar-boronic acid complexes.
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Renji Okazaki, Mao Minoura, Takayuki Kawashima
1993 Volume 22 Issue 6 Pages
1047-1048
Published: 1993
Released: April 27, 2006
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Reaction of sterically hindered hydrazones with tellurium dichloride in the presence of triethylamine in benzene afforded Δ
3-1,3,4-telluradiazolines, a novel heterocycle, probably via 1,3-dipolar cycloaddition of telluroketones with diazo compounds, both generated in situ.
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Yoshiya Ikawa, Toshi Nagata, Kazuhiro Maruyama
1993 Volume 22 Issue 6 Pages
1049-1052
Published: 1993
Released: April 27, 2006
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A series of dinuclear manganese(II) complexes [R
1-LMn
2(R
2CO
2)]ClO
4 were synthesized and X-ray crystal structure analysis of [CH
3-LMn
2(CH
3CO
2)]ClO
4 (
1) was performed. Two manganese ions of
1 were six-coordinate with highly deformed octahedral structure. Electrochemical measurements of these complexes revealed that both the substituents of the phenol ring and those on the ligating acetate effectively control the redox properties of the Mn(II) center.
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Mitsutomo Miyashita, Isamu Shiina, Teruaki Mukaiyama
1993 Volume 22 Issue 6 Pages
1053-1054
Published: 1993
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Various carboxanilides are prepared in excellent yields from nearly equimolar amounts of silyl carboxylates and the corresponding
weakly nucleophilic anilines under mild conditions by using
p-trifluoromethylbenzoic anhydride and a catalytic amount of active titanium(IV) salt.
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Hiroyuki Tani, Katsunori Nii, Kazunori Masumoto, Nagao Azuma, Noboru O ...
1993 Volume 22 Issue 6 Pages
1055-1058
Published: 1993
Released: April 27, 2006
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A novel 2,3,8,9-tetrahydro-1,4,7,10-tetrathiachrysene (
7) was conveniently prepared by dithioacetalization of 1,5-decalinedione with 1,2-ethanedithiol followed by ring expansion and aromatization on treatment with tellurium tetrachloride. Electrocrystallization by anodic oxidation of
7 in the presence of suitable electrolytes gave the radical cation salts, (
7)
2ClO
4 or (
7)
2BF
4 with a considerable high electrical conductivity (0.4–12 Scm
−1) and good thermal stability. Single crystal X-ray analyses revealed a segregated stack structure for
7 and anions in these salts.
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Shojiro Maki, Kunihiro Toyoda, Seiji Kosemura, Shosuke Yamamura
1993 Volume 22 Issue 6 Pages
1059-1062
Published: 1993
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Several tricyclo[5.3.1.0
1,5]undec-9-ene-8,11-diones have been synthesized in stereospecific manner, by using electrochemical oxidation of the corresponding phenols with
trans or
cis para-halo substituted styryl group. Two of the products were subjected to base-catalyzed fragmentation reaction to afford two different types of bicyclic compounds selectively, one of which has been readily converted into a triquinane-type compound.
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Masanobu Nishii, Shun’ichi Sugimoto, Yuichi Shimizu, Nobutake Su ...
1993 Volume 22 Issue 6 Pages
1063-1066
Published: 1993
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The adhesive property of polytetrafluoroethylene (PTFE) film containing a small amount of carbonaceous materials such as carbon black and graphite was improved remarkably by KrF-laser irradiation in air. The adhesive strength increased with the irradiated energy and the fluence of laser.
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Michitaka Ohtaki, Daisuke Ogura, Koichi Eguchi, Hiromichi Arai
1993 Volume 22 Issue 6 Pages
1067-1070
Published: 1993
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Partial substitution of Cu, Zn, Nb, Ag, Sb, and In for Fe in FeSi
2 significantly varied the structure of the sintered samples. The thermoelectric power increased with decreasing relative density of the samples, while the electrical conductivity decreased at the same time. However, microstructural modification by increasing the size of the particles composing the samples improved the thermoelectric figure of merit through increase in the thermoelectric power and decrease in the thermal conductivity without affecting the electrical conductivity.
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Ryouichi Kitagawa, Yasushi Kai, Gelii V. Ponomarev, Ken-ichi Sugiura, ...
1993 Volume 22 Issue 6 Pages
1071-1074
Published: 1993
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X-Ray analysis of
trans-1,2-bis{
meso-[nickel(II)octaethylporphyrinyl]} ethene has revealed that the compound has nonplanar structure and the nickel-coordination planes of porphyrin rings are close to perpendicular (72.5°) to the plane of the central double bond. Both porphyrin rings have saddle-shaped structure due to the steric repulsion between ethyl substituents.
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Katsutoshi Ohkubo, Yasuo Urata, Kei-ichi Seri, Hitoshi Ishida, Takashi ...
1993 Volume 22 Issue 6 Pages
1075-1078
Published: 1993
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The catalytic activities of IgG and IgM monoclonal antibodies (Antibody KD2-1–KD2-260) derived from a hapten of
p-nitrophenyl hydrogen 4-(hydroxycarbonyl)butylphosphonate were examined in the hydrolysis of
p-nitrophenyl acetate in 2.4–4.0% (v/v) MeCN-H
2O in Tris-HCl buffer (pH 5.0–8.0) at 293–308 K. The most efficient Antibody KD2-260 resulted in k
cat/k
uncat = 2.1 × 10
3 (308 K) – 3.1 × 10
3 (293 K), K
m = 4.9 × 10
−6 (293 K) – 1.5 × 10
−5 mol dm
−3 (308 K, and K
m/K
i = 80 (303 K) at pH 6.0.
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Tadahiro Fujitani, Masahiro Saito, Yuki Kanai, Masami Takeuchi, Keiko ...
1993 Volume 22 Issue 6 Pages
1079-1080
Published: 1993
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The methanol synthesis activity per unit copper surface area of Cu/ZnO catalyst combined with Ga
2O
3 was higher than those of Cu/ZnO and Cu/ZnO/Al
2O
3 catalyst in the hydrogenation of carbon dioxide.
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Gorou Arai, Mamoru Hayashi, Tatsuya Noma, Iwao Yasumori
1993 Volume 22 Issue 6 Pages
1081-1084
Published: 1993
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D-amino acid oxidase, a flavoprotein, was immobilized in a conductive redox polymer prepared on Au-electroplated glassy carbon electrode by an electrochemical polymerization of mercaptohydroquinone. The enzyme-modified electrode possessed of an excellent selectivity for D-amino acids and showed fast response and good stability with the substrates.
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