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Shoji Kaneko, Tadatoshi Mitsuzawa, Satoshi Ohmori, Motoshi Nakamura, K ...
1993 Volume 22 Issue 8 Pages
1275-1278
Published: 1993
Released on J-STAGE: March 22, 2006
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The separation characteristics of silica-zirconia. silica-alumina, Silica-titania, and silica-magnesia gels for benzene, dimethyl phthalate, and pyridine have been evaluated as column packing materials for liquid chromatography. Of these mixed-oxide gels, silica-magnesia had the best separation ability particularly for a basic compound, pyridine depending presumably on the reduction of the activity of silanol group on silica surface.
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Takashi Furukawa, Masaki Seto, Yoshiaki Horiguchi, Isao Kuwajima
1993 Volume 22 Issue 8 Pages
1279-1282
Published: 1993
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Copper catalyzed conjugate addition of Grignard reagents to enones was effected with high 1,4-diastereoinduction and was used for the preparation of taxane precursors.
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Munetoshi Isayama, Kanji Sakata, Toyoki Kunitake
1993 Volume 22 Issue 8 Pages
1283-1286
Published: 1993
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A self-supporting, multilayered film which was prepared from an aqueous dispersion of montmorillonite and orthophosphoric acid (H
3PO
4) remained intact even in hot water and maintained the ion exchange capacity similar to that of the original montmorillonite powder. An ammonium surfactant (CTAB) was intercalated into this film readily to give a highly oriented composite film.
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Shiro Hatakeyama, Haiping Lai, shidong Gao, Kentaro Murano
1993 Volume 22 Issue 8 Pages
1287-1290
Published: 1993
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Reaction of ozone with three kinds of olefins in air was studied. H
2O
2, CH
3OOH, and HOCH
2OOH were collected and analyzed with HPLC with a fluorometric detector. Direct reaction of CH
2OO with H
2O was found to be the source of HOCH
2OOH. CH
3OOH was formed only from the olefins which have a methyl group. Detailed reaction mechanisms are discussed.
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Hideo Tomioka, Kazunori Komatsu, Takehito Nakayama, Masayoshi Shimizu
1993 Volume 22 Issue 8 Pages
1291-1294
Published: 1993
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Photolysis of the title bis-diazirine matrix-isolated in Ar at 10 K monitored by IR and UV/vis spectroscopy indicated that the diazirine underwent stepwise elimination of N
2 to produce 3-(4-chlorocarbenophenyl)-3-chlorodiazirine which then eliminated the second N
2 to generate para-phenylenebis(chloromethylene). The structure of the bis-carbene was discussed based on the spectroscopic data as well as the semiempirical theoretical calculations.
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Yukiko Nishizaka, Makoto Misono
1993 Volume 22 Issue 8 Pages
1295-1298
Published: 1993
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Palladium ion-exchanged H-ZSM-5 showed a high catalytic activity for the removal of dilute nitrogen monoxide in the presence of methane and oxygen at 350–550 °C. The presence of palladium and (protonic) acidity is essential for the high activity.
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Naoki Toshima, Shin-ichi Kawamura, Tsuyoshi Tominaga
1993 Volume 22 Issue 8 Pages
1299-1302
Published: 1993
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The reversible electrochromism in the thin films of single-transition metal phthalocyanines is reported. Copper and nickel phthalocyanine films can be oxidized and rereduced reversibly, when the film is enough thin, the scan range is well controlled, and the appropriate anion is used as the electrolyte. Especially, the cyclic voltammogram of nickel phthalocyanine films in a sodium nitrate solution is almost Nernstian.
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Yoko Matsumoto, Yoshito Matsumoto, Junichi Inoue, Ryuichi Ueoka
1993 Volume 22 Issue 8 Pages
1303-1304
Published: 1993
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The diastereoselectivity for the hydrolysis of Z-D(L)-Phe-L-Phe p-methoxycarbonylphenyl ester was maximized (k
sDL/k
sLL = 34) at the optimum temperature (30 °C). This could be attributed to the conformational change in the DL isomer, which was supported by the circular dichroism measurements.
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Takaaki Niinomi, Masahiko Sisido
1993 Volume 22 Issue 8 Pages
1305-1308
Published: 1993
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A mixed dinucleotide pdCpA, was synthesized and characterized by spectroscopic as well as enzymic analysis. The dinucleotide was acylated with an
N-protected nonnatural amino acid (Boc-azoAla). The acylation was found to occur at the 2′(3′)-
O position exclusively.
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Tetsuo Sekiguchi, Yoshihito Mori, Ichiro Hanazaki
1993 Volume 22 Issue 8 Pages
1309-1312
Published: 1993
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Effect of photo-irradiation on the autocatalytic oxidation of [Ru(bpy)
3]Cl
2 by acidic bromate has been investigated in a continuous-flow stirred tank reactor. The photo-induced bifurcation structure and phase diagram have been determined. It is shown that, for a certain range of the bromate concentration, the photo-irradiation can either promote or inhibit the autocatalytic oxidation of [Ru(bpy)
3]
2+ depending on the irradiation light power.
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Yutaka Ukaji, Takahiro Hatanaka, Alauddin Ahmed, Katsuhiko Inomata
1993 Volume 22 Issue 8 Pages
1313-1316
Published: 1993
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It was observed that differentiation of enantiotopic face in the addition reaction of organometallics to 3,4-dihydroisoquinoline
N-oxide was well-regulated by the use of an external chiral auxiliary;
i.e., Grignard reagents added from the
si-face of the nitrone in the presence of bromomagnesium (2
S,3
R)-4-dimethylamino-1,2-diphenyl-3-methyl-2-butoxide, while dialkylzinc attacked from the
re-face.
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Teruyuki Kondo, Shinji Kotachi, Shin-ichi Ogino, Yoshihisa Watanabe
1993 Volume 22 Issue 8 Pages
1317-1320
Published: 1993
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Ruthenium complex-catalyzed
N-heterocyclization of 2-aminopyridines with
vicinal-diols offers a novel synthetic method for various imidazo[1,2-
a]pyridines. For example, the reaction of 2-amino-4-methylpyridine with 1,2-cyclohexanediol in the presence of a catalytic amount of RuCl
2(PPh
3)
3 under reflux in diglyme for 24 h afforded 2-methyl-6,7,8,9-tetrahydropyrido[1,2-
a]benzimidazole in 74% yield.
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Tooru Fujiwara, Toshiaki Iwasaki, Takeshi Takeda
1993 Volume 22 Issue 8 Pages
1321-1324
Published: 1993
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The reaction of 1-methoxymethyl-2-phenylthiocyclobutanes with phenylthiotrimethylsilane followed by hydrolysis gave (
E)- and (
Z)-γ,δ-unsaturated ketones with high stereoselectivity. The starting materials were easily prepared by the stereoselective addition of Grignard reagents to
trans-2-phenylthiocyclobutyl ketones.
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Ryu Sato, Toshitaka Murata, Shin-ichi Chida, Satoshi Ogawa
1993 Volume 22 Issue 8 Pages
1325-1328
Published: 1993
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Benzopentathiepin readily reacted with trialkyl phosphites to give
S-[2-(alkylthio)-phenyl]
O,
O′-dialkyl thiophosphates and/or
O,
O′-dialkyl
S-(2-mercaptophenyl) thiophosphates. The selectivity for formation of these thiophosphates was dramatically affected by the reaction temperature and the solvent used.
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Toshikazu Takahashi, Kazuhisa Hiratani, Eiichi Kimura
1993 Volume 22 Issue 8 Pages
1329-1332
Published: 1993
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Tertiary polyamine ruthenium(III) complex
trans-[RuCl
2(L)]
+ (L = 2,5,9,12-tetramethyl-2,5,9,12-tetraazatridecane) has been prepared which can react with Mg and an atmospheric N
2 gas in aqueous solution at room temperature to yield the first N
2-binding ruthenium(II) tertiary polyamine complex
trans-[RuCl(L)(N
2)]
+ that is converted into
trans-[Ru(OH)(L)(N
2)]
+ and
trans-[Ru(L)(N
2)(OH
2)]
2+.
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Noriko Imaizumi, Yumiko Nakahara, Kayoko Suzuki, Kikuo Oikawa
1993 Volume 22 Issue 8 Pages
1333-1336
Published: 1993
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For the selective determination of aqueous chlorine dioxide(ClO
2) in the mixed solution with chlorine, dimethylsulfoxide(DMSO) was used as a masking agent for chlorine. In spectrophotometric and iodometric determination of ClO
2, a large excess of DMSO did not affect on ClO
2, but it completely depressed the interference from chlorine.
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Yohji Misaki, Toshitaka Matsui, Kazuya Kawakami, Hiroyuki Nishikawa, T ...
1993 Volume 22 Issue 8 Pages
1337-1340
Published: 1993
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The title compound (
1a) and its related unsymmetrical derivatives were prepared as new donors for organic conductors, and electrochemical properties and crystal structure of
1a were investigated. Several charge-transfer complexes and cation radical salts using them showed metallic temperature dependence of conductivity down to ca. 100 K.
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Yohji Misaki, Hiroyuki Nishikawa, Tokio Yamabe, Takehiko Mori, Hiroo I ...
1993 Volume 22 Issue 8 Pages
1341-1344
Published: 1993
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Several cation radical salts of MeDTET (2-isopropylidene-1,3-dithiolo[4,5-
d]ethylenedithiotetrathiafulvalene) showed metallic temperature dependence of conductivity down to 0.6–0.9 K. X-Ray crystal structure of (MeDTET)
3PF
6TCE
x revealed that the donors have “κ-type” arrangement in the conducting sheet. This is the first example of a κ-type salt that has a composition other than 2:1.
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Mitsuo Kira, Toyotaro Maruyama, Hideki Sakurai
1993 Volume 22 Issue 8 Pages
1345-1348
Published: 1993
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The n(Si)→3p(Si) absorption maxima of silylenes were shifted significantly red by introducing trimethylsilyl and trimethylgermyl substituents. The origin of the substituent effects will be attributed to the σ-electron donating ability of the trimethylmetal groups which lift the energy level of n(Si) orbital significantly.
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Kazuhiko Mizuno, Kazuhisa Nakanishi, Toshitsugu Kobata, Yoshito Sawada ...
1993 Volume 22 Issue 8 Pages
1349-1352
Published: 1993
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The photoreaction of a styrene/4-tributylstannylmethyl styrene (4:1) copolymer with di- and tetra-cyanoaromatic compounds in benzene-acetonitrile (1:1) gave polymers having cyanoaromatic functions in the side chain. These polymers were soluble in benzene and served as effective and recoverable sensitizers for three different types of photoinduced electron-transfer mediated organic photoreactions.
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Kiyotaka Onitsuka, Xin-Qung Tao, Yasuhiro Otsuka, Kenkichi Sonogashira
1993 Volume 22 Issue 8 Pages
1353-1356
Published: 1993
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The reaction of 1,1′-dialkynylferrocene (η
5-C
5H
4C≡CR)
2Fe (
1) (R = Ph, SiMe
3, Me, Fc; Fc = ferrocenyl) with excess octacarbonyldicobalt (
2) results in the formation of dark green complexes (η
5-C
5H
4C≡CR)
2Fe{Co
2(CO)
6}
2 (
3) (R = Ph, SiMe
3, Me, Fc), in which a Co
2(CO)
6 group coordinates to each of the two C≡C bonds of
1. When 1,1′-di(phenylethynyl)ferrocene (
1a) was treated with an equimolar amount of
2, (η
5-C
5H
4C≡CPh)
2Fe{Co
2(CO)
6}, as well as
3a, was obtained.
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Masao Hisatome, Koichi Ikeda, Shusuke Kishibata, Koji Yamakawa
1993 Volume 22 Issue 8 Pages
1357-1360
Published: 1993
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Porphyrins having an adenine-thymine or guanine-cytosine pair have been synthesized. Spectroscopic study has revealed that the two nucleobases form inter- and intramolecular base pairs in
anti and
syn atropisomers, respectively, and that the guanine-cytosine pair is more close to the porphyrin ring than the adenine-thymine pair.
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Toyonari Sugimoto, Seiji Yamaga, Makoto Nakai, Kazunari Ohmori, Masaya ...
1993 Volume 22 Issue 8 Pages
1361-1364
Published: 1993
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The ESR spectra of tetrathiafulvalene (TTF) derivatives substituted with imino pyrolidine- and piperidine-1-oxyls and their cation radicals were investigated. For the neutral TTF’s the unpaired electron is localized at the nitroxide group. While, an intramolecular spin-spin exchange albeit weak occurs between the TTF cation radical and the nitroxide radical in the one-electron oxidized TTF’s, and the ground spin state of the biradical is a singlet.
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Hiroshi Sugi, Masahiro Kato
1993 Volume 22 Issue 8 Pages
1365-1368
Published: 1993
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Plait points are meaningful for the shapes of the ternary solubility curves. However, no report is found for calculation of the ternary plait point from activity coefficient equation. The ternary plait point was able to be calculated from the NRTL equation for three ternary systems.
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Yasuo Kikugawa, Kimiyo Mitsui
1993 Volume 22 Issue 8 Pages
1369-1372
Published: 1993
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The hydroxyl group of N-hydroxy-N-phenylamides rearranges mainly to the
ortho position of the N-phenyl ring by the system (
n-Bu)
3P-CCl
4-CH
3CN; use of less than a stoichiometric amount of (
n-Bu)
3P is effective for this reaction.
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Koki Matsubara, Takenori Sasaki, Teruaki Mukaiyama
1993 Volume 22 Issue 8 Pages
1373-1376
Published: 1993
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In the presence of a catalytic amount of active acidic species generated from SnCl
4 and AgClO
4, various α-glucosides are stereoselectively synthesized in excellent yields from 1-O-2′-(2′-methoxyethoxy)acetyl-2,3,4,6-tetra-O-benzyl-D-glucopyranose and alkyl trimethylsilyl ethers. β-Glucosides are also selectively prepared by using a catalyst, generated from SiCl
4 and AgClO
4 in the above reaction.
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Yasuyuki Aratono, Masami Nakada, Chiaki Sagawa, Mikio Nakashima, Masak ...
1993 Volume 22 Issue 8 Pages
1377-1380
Published: 1993
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Phase change induced by 40 keV He
+ ion bombardment in α-Fe
2O
3 and Fe
3O
4 was studied by conversion electron Mössbauer spectroscopy. From the similarity of ion bombardment effect and thermal annealing behavior, the significant role of thermochemical process after the propagation of the collision cascade for the final fate of the bombarded entity was suggested.
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Ken-ichi Machida, Akira Nakamoto, Gin-ya Adachi
1993 Volume 22 Issue 8 Pages
1381-1384
Published: 1993
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Carbonitriding characteristics of NdFe
11Ti by applying the plasma technique to it in a CH
4-N
2-H
2 mixed gas were studied. Carbon and nitorgen were simultaneously introduced to the NdFe
11Ti crystal lattice even at 423 K, of which the electronic states were found to be of metal carbide and nitride, respectively.
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Shiro Kobayashi, Shaokui Cao
1993 Volume 22 Issue 8 Pages
1385-1388
Published: 1993
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Higher molecular weight polygermanes were synthesized by a ligand substitution polymerization of the 1,4-dioxane complex of germanium dichloride with organolithium compounds at a lower reaction temperature. Different from the conventional Wurtz-type coupling reaction, the present polymerization gives rise much higher yields of polygermanes.
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Yukako Ohashi, Mikio Nakamura
1993 Volume 22 Issue 8 Pages
1389-1392
Published: 1993
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The
1H NMR signals of [N,N′-o-phenylenebis(salicylaldiminato)]cobalt(II), [Co(II)(saloph)], showed an anti-Curie behavior in DMF-d
7 solution. Temperature dependence in magnetic moments suggested the formation of antiferromagnetically coupled dimeric species at low temperature.
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Shinro Yasui, Kosei Shioji, Atsuyoshi Ohno, Masakuni Yoshihara
1993 Volume 22 Issue 8 Pages
1393-1396
Published: 1993
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Photo-redox between diphenylphosphine oxide and 10-methylacridinium iodide with visible light in aqueous acetonitrile under argon atmosphere is initiated by single electron transfer from the phosphorus compound to the acridinium salt in the photo-excited state giving diphenylphosphinic acid and 10-methylacridan as the final products. Iodide ion/iodine couple plays a crucial role for transferring an electron in this reaction.
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Katsuhiko Fujimoto, Hirokazu Sakai, Takeshi Nakai
1993 Volume 22 Issue 8 Pages
1397-1400
Published: 1993
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The title rearrangement is shown to exhibit syn diastereoselectivity independent of the crotyl geometry, the degree decreasing in the order: 2- > 4- >3-picolyl ether for the
E series and in the opposite order for the
Z series. These trends suggest that the electronic effect plays a profound but not sole factor in governing the orientational preference of the pyridyl group in the transition states.
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Tateaki Wakamiya, Kunio Saruta, Shoichi Kusumoto, Kiichiro Nakajima, K ...
1993 Volume 22 Issue 8 Pages
1401-1404
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The benzyl phosphate-protection for phosphoamino acid is very useful for Boc mode solid-phase synthesis of phosphopeptides. A phosphothreonine-containing peptide related to the EGF receptor protein was synthesized by use of this methodology.
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Chung-gi Shin, Yutaka Nakamura, Kazuo Okumura
1993 Volume 22 Issue 8 Pages
1405-1408
Published: 1993
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The practical syntheses of a few oxazole α-dehydroamino acids and their dehydrodi- and tripeptides, which are important moieties and segments of berninamycin A, macrocyclic peptide antibiotic, were first accomplished.
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Victor V. Borovkov, Gelii V. Ponomarev, Akito Ishida, Takahiro Kaneda, ...
1993 Volume 22 Issue 8 Pages
1409-1412
Published: 1993
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A facile aerobic oxidation of 1,2-bis(
meso-octaethylporphyrinyl)ethane and other similar dimers to the corresponding
trans-1,2-bis(
meso-porphyrinyl)ethenes in several organic acids has been studied by UV-vis and
1H NMR spectroscopy and the general mechanism of the oxidation has been proposed. The key step of the oxidation is monoprotonation of the two porphyrin rings in dimer followed by two electron oxidation.
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Rainer Ludwig, Katsuhiko Ariga, Seiji Shinkai
1993 Volume 22 Issue 8 Pages
1413-1416
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The detection of mono- and disaccharides by monolayers of
m-hexa decyloxyphenylboronic acid at the air-water interface becomes very sensitive if the boronic acid is located in a cationic environment provided by a water-soluble quaternized polymeric amine or a quaternized amphiphilic amine.
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Itaru Hamachi, Shigeaki Tanaka, Seiji Shinkai
1993 Volume 22 Issue 8 Pages
1417-1420
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A protoheme derivative with covalently-bound tris(2,2′-bipyridine) ruthenium (II) [Ru(bpy)
3]
2+ was successfully incorporated into apo-myoglobin. In the reconstituted myoglobin emission of *[Ru(bpy)
3]
2+ was quenched intramolecularly, the efficiency being greater by more than 30-fold than that of the corresponding intermolecular process.
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Hitomi Suzuki, Takashi Murashima, Atsuo Tatsumi, Iku Kozai
1993 Volume 22 Issue 8 Pages
1421-1424
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Alkyl aryl ketones react smoothly with nitrogen dioxide at low temperatures in the presence of ozone to give a mixture of
ortho and
meta nitration products (
o/
m = 1.1–3.8/1.0), the former becoming predominant with the increasing size of alkyl moiety.
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Yutaka Wakayama, Toyoki Kunitake
1993 Volume 22 Issue 8 Pages
1425-1428
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Individual molecular bilayers in cast films of double-chain amphiphiles were observed directly by transmission electron microscopy upon appropriate staining. Ordering of bilayers was affected by a minor structure change of the component amphiphile.
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Tsukasa Moriya, Norio Miyaura, Akira Suzuki
1993 Volume 22 Issue 8 Pages
1429-1432
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The cross-coupling reaction of organozinc reagents with a pinacol ester of (Z)-(1-iodo-1-hexenyl)boronic acid in the presence of Pd(PPh
3)
4 proceeded with complete retention of the configuration of the starting boronate. The reaction provided (E)-(1-organo-1-hexenyl)boronic esters which were not available by the conventional hydroboration technique. The utility of the reaction was demonstrated by stereoselective synthesis of an exocyclic alkene
via the cross-coupling reaction with chloroenone.
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Keiji Inoue, Naohide Matsumoto, Hisashi Okawa
1993 Volume 22 Issue 8 Pages
1433-1436
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A 3
d-4
d binuclear Cu(II)-Ru(III) complex exhibiting ferromagnetic spin-coupling [Cu(A)Ru(salen)(PPh
3)]ClO
4·MeOH has been synthesized and characterized, where H
2A = N-(2-imidazolidene)-N′-(acetylacetonylidene)ethylendiamine and H
2salen = N,N′-bis(salicylidene)ethylenediamine. The magnetic susceptibility data (4.2–300 K) were well reproduced by the equation derived from
H = −2
JSCu·
SRu (
SCu = 1/2,
SRu = 1/2) with
g = 2.04 and
J = +6.55 cm
−1. The ESR study indicated that the magnetic orbitals of Cu(II) and Ru(III) are orthogonal to each other.
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Hideki Kinoshita, Yoshio Hayashi, Yasue Murata, Katsuhiko Inomata
1993 Volume 22 Issue 8 Pages
1437-1440
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3,4-Disubstituted Δ
3-pyrrolin-2-ones were prepared in high yields via 5-tosyl-Δ
3-pyrrolin-2-ones (
4) starting from 2-tosylpyrroles regioselectively. The compounds
4 were found to be useful intermediates for the preparation of a variety of Δ
3-pyrrolin-2-one derivatives. The reactions of
4 with various nucleophiles and active methylene compounds bearing an appropriate leaving group are described.
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Hideki Kinoshita, Hla Ngwe, Kazuhiro Kobori, Katsuhiko Inomata
1993 Volume 22 Issue 8 Pages
1441-1442
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The reaction of 5-(
p-toluenesulfonyl)-3,4-disubstituted Δ
3-pyrrolin-2-one with aldehydes in the presence of tributylphosphine and 1,8-diazabicyclo[5.3.0]undec-7-ene gave the corresponding 5-exomethylene compounds in good yields. A pyrromethenone derivative as a potential equivalent to C/D ring component of phytochromobilin dimethyl ester was effectively prepared by means of the present method.
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Akira Yamaguchi, Kunio Awaga, Tamotsu Inabe, Takayoshi Nakamura, Mutsu ...
1993 Volume 22 Issue 8 Pages
1443-1446
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X-Ray crystal analyses and magnetic measurements have been carried out on the
p-
N-methylpyridinium α-nitronyl nitroxide (
p-MPYNN) cation radical salts,
p-MPYNN·I and
p-MPYNN·ClO
4. The
p-MPYNN molecules are connected by short intermolecular contacts between the NO groups in the crystal of
p-MPYNN·I, while the radical molecules are separated from each other by the ClO
4− anions in
p-MPYNN·ClO
4. The magnetic properties of
p-MPYNN·I and
p-MPYNN·ClO
4 are found to be consistent with their crystal structures.
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Ryoko Tanaka, Yasunao Kuriyama, Hiroki Itoh, Hirochika Sakuragi, Katsu ...
1993 Volume 22 Issue 8 Pages
1447-1450
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Isomeric 6,6-diphenyl-6,7,8,9-tetrahydro-5
H-benzocyclohepten-7-one and 7,7-diphenyl-6,7,8,9-tetrahydro-5
H-benzocyclohepten-6-one (
2) were photolyzed in methanol to give rise to unsaturated aldehydes as well as diphenyltetrahydronaphthalene, a decarbonylation product (for
2). Lifetimes of the intermediate triplet biradicals were dependent on their structures, indicating that cyclic conformations play an important role in the intersystem crossing of biradicals.
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Shunichi Fukuzumi, Morifumi Fujita, Gen-etsu Matsubayashi, Junzo Otera
1993 Volume 22 Issue 8 Pages
1451-1454
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A β,β-dimethyl-substituted ketene silyl acetal reduces
p-chloranil to produce the carbon-oxygen adduct, the hydrolysis of which yields the corresponding hydro-quinone ether (
3). The structure of
3 has been determined by the X-ray crystal analysis. On the other hand, the reaction of a nonsubstituted ketene silyl acetal with
p-fluoranil yields the carbon-carbon adduct selectively. The mechanistic difference between the C-O and C-C bond formation is elucidated based on the kinetic study.
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Takashi Komori, Seiji Shinkai
1993 Volume 22 Issue 8 Pages
1455-1458
Published: 1993
Released on J-STAGE: April 27, 2006
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Conformationally-immobile calix[4]arenas with a cone conformation coupled to C
6H
4-
p-C
mH
2m+1 (m = 3, 8, 12, 14, and 16) via an azomethine linkage were synthesized. It was found that the compounds with m ≥ 8 have the liquid crystal phase with a columnar arrangement.
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Takaki Kanbara, Takakazu Yamamoto
1993 Volume 22 Issue 8 Pages
1459-1462
Published: 1993
Released on J-STAGE: April 27, 2006
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Reactions of 5,8-dibromo-2,3-diphenylquinoxaline and 5,8-dibromo-2,3-di(
p-tolyl)-quinoxaline with a zero-valent nickel complex afford poly(2,3-diphenylquinoxaline-5,8-diyl) (
poly-1) and poly(2,3-di(
p-tolyl)quinoxaline-5,8-diyl), respectively. These polymers show good electrochemical activity for n-type doping and strong fluorescence in solutions as well as in cast films. A light-emitting diode consisted of MgAg/
poly-1/ITO electric junction is driven at about 2 V and has a peak emission wavelength of 490 nm.
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Tadahiro Nakamoto, Motomi Katada, Satoshi Kawata, Susumu Kitagawa, Kou ...
1993 Volume 22 Issue 8 Pages
1463-1466
Published: 1993
Released on J-STAGE: April 27, 2006
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The crystal structure of newly synthesized trinuclear iron cyanoacetate complex, [Fe
3O(NCCH
2CO
2)
6(H
2O)
3], has been determined by single-crystal X-ray structure analysis and found to have a three-dimensional hydrogen-bond network. The temperature dependence of Mössbauer spectrum shows that the complex converts from a valence-trapped state to a valence-detrapped state within a 10 K range.
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Daisuke Takaoka, Hiroyuki Tani, Hiroshi Nozaki, Mitsuru Nakayama
1993 Volume 22 Issue 8 Pages
1467-1468
Published: 1993
Released on J-STAGE: April 27, 2006
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Two new elemanolides, aciculatalactone and de-
O-methylsericealactone, have been isolated from
Neolitsea aciculata Koidz. and their structures have been determined by using a variety of 2D NMR techniques and a X-ray crystallographic analysis.
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