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Yoshihisa Sakata, Yasunobu Hirata, Kanji Miyahara, Hayao Imamura, Susu ...
1993 Volume 22 Issue 3 Pages
391-394
Published: 1993
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A cerium oxide loaded TiO
2 catalyst exhibited a high photocatalytic activity of H
2 production from methanol aqueous solution. It was confirmed that this catalyst pretreated by H
2 and O
2 has an ability for photocatalytic decomposition of H
2O in NaOH aqueous solution into H
2 and O
2 (10 M NaOH).
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Toshihiro Koyama, Akira Kitani, Sotaro Ito, Kazuo Sasaki
1993 Volume 22 Issue 3 Pages
395-398
Published: 1993
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The electrocatalytic oxidation of styrene with molecular oxygen in the presence of CuCl
2 in an acetonitrile solution promotes C-C double bond cleavage reaction to form benzaldehyde. Continuous supply of Cl
− is required to keep the catalytic activity.
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Michael Hanack, Reinhold Dieing, Ursula Röhrig
1993 Volume 22 Issue 3 Pages
399-402
Published: 1993
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Bis(isocyanide) and bis(pyridine) complexes of tetra(
tert-butyl)-2,3-anthracenocyaninatoiron(II) were synthesized from 6-
tert-butyl-2,3-dicyanoanthracene and characterized by UV/Vis, NMR, and Mössbauer spectroscopy. Linear annulation of benzene rings to the phthalocyanine macrocycle produces a bathochromic shift of the Q-band. The first oxidation potential of the 2,3-anthracenocyanine macrocycle determined by cyclic voltammetry is lower than that of 2,3-naphthalocyanine.
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Makoto Iwai, Hiroshi Shoji, Shogo Shimazu, Takayoshi Uematsu
1993 Volume 22 Issue 3 Pages
403-406
Published: 1993
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Interlayer-polymerization of (3-aminopropyl)trimethoxysilane (APMS) was carried out in the interlayer of lithium hectorite(LHT), and hectorites modified by “tuning guest” such as alkylammonium hectorite(CnNHT) and pyridinium hectorite (PyHT). XRD measurements revealed that the polymer-LHT complex showed no d
001 diffraction peaks, while the polymer-CnNHT and -PyHT complexes had definite basal spacings depending on the guest or the amount of APMS. The polymer-clay complexes were characterized by means of
29Si CP/MAS NMR and FT-IR spectra.
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Tatsumi Ishihara, Hiroyoshi Shigematsu, Yumi Abe, Yusaku Takita
1993 Volume 22 Issue 3 Pages
407-410
Published: 1993
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Effects of metal oxide additions on the activity of Pd catalysts for CH
4 combustion were examined in this study. Since a high concentration of oxygen on Pd surface can be attained, the addition of metal oxide is useful for enhancing the oxidation activity of Pd. In particular, NiO added Pd catalysts are highly active for CH
4 combustion, and complete oxidation of CH
4 can be attained below 823 K.
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Yuzo Nishida, Noriko Tanaka, Shigeyuki Takahashi
1993 Volume 22 Issue 3 Pages
411-414
Published: 1993
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The reaction mixture of trans-[FeCl
2(cyclam)]
+ and linolenic acid exhibited high ability for degradation of tetraphenylcyclopentadienone, one of the famous singlet oxygen(
1Δ
g) quenchers, and the peroxidation of linolenic acid was found to proceed in this solution.
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Yuichi Miyazaki, Takaki Kanbara, Kohtaro Osakada, Takakazu Yamamoto
1993 Volume 22 Issue 3 Pages
415-418
Published: 1993
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Poly(thiophene-2,5-diyl) derivatives having alkoxy substituents at 3-positions are synthesized by dehalogenation polycondensation of the corresponding 2,5-dibromothiophene derivatives with zero-valent nickel complex. The obtained polymers show not only usual p-type doping and undoping behaviors but also unique n-type doping and undoping behaviors due to the stabilization of n-doped state by interaction between dopant cation and ethereal oxygen.
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Takaki Kanbara, Takakazu Yamamoto
1993 Volume 22 Issue 3 Pages
419-422
Published: 1993
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Dehalogenation polycondensation of 4,7-dibromobenzimidazole and 4,7-dibromo-2,1,3-benzothiadiazole with a zero-valent nickel complex afford poly(benzimidazole-4,7-diyl) and poly(2,1,3-benzothiadiazole-4,7-diyl), respectively. These polymers give rise to electrochemically active doping-undoping cycles in both reduction and oxidation regions, and are converted into electrically conducting materials on both n- and p-type chemical doping.
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Hiroshi Nakajima, Gen-etsu Matsubayashi
1993 Volume 22 Issue 3 Pages
423-426
Published: 1993
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Powdered VOPO
4·2H
2O suspended in excess neat aniline gives intercalation compounds VOPO
4·(H
2O)
x·(PhNH
3+)
y (0.6 < x < 1.1; 0.5 < y < 1.0) with the reduction of the V(V) to V(IV) state. The compounds with y > 0.7 lead to the polymerization of the cation by addition of the Cu(II) ion to afford polyaniline. Suspended VOPO
4·2H
2O powders react with PhNH
3+Cl
− dissolved in ethanol to give the compound intercalated with both the anilinium cation and polyaniline.
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Meguru Tezuka, Masakazu Iwasaki
1993 Volume 22 Issue 3 Pages
427-430
Published: 1993
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The homogeneous catalysis of cobalt tetraphenylporphine (CoTPP) in the electroreduction of CO
2 was investigated by means of cyclic voltammetry (CV). Based on the kinetical treatment of the data, the rate constant for the electron transfer to CO
2 from CoTPP dianion could be determined and the activation energy of the step was estimated as 34.5 kJ/mol.
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Takatoshi Kinoshita, Masahiro Higuchi, Akira Takizawa, Yoshiharu Tsuji ...
1993 Volume 22 Issue 3 Pages
431-434
Published: 1993
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The direct vesicle-to-vesicle communication can be made by an amphiphilic polypeptide composed of two amphiphilic helices jointed with a hydrophilic spacer between them prepared by “Monolayer reaction method”.
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Hiroshi Seto, Takako Seto, Koichi Nagakura, Hiroshi Koike
1993 Volume 22 Issue 3 Pages
435-438
Published: 1993
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Reaction of malonaldehyde with adenosine at pH 4.5 gave three major adducts including a novel one containing diastereomeric dioxazatricycloundecene residue, formed by addition of three malonaldehyde units.
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Teruaki Mukaiyama, Kiyotaka Yorozu, Toshihiro Takai, Tohru Yamada
1993 Volume 22 Issue 3 Pages
439-442
Published: 1993
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In the presence of bis(3-methyl-2,4-pentanedionato)cobalt(II) complex catalyst, various trisubstituted olefins are smoothly monooxygenated into the corresponding epoxides in high yields under neutral conditions by the combined use of molecular oxygen and propionaldehyde diethyl acetal.
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Yasushi Morita, Takeshi Ohmae, Jiro Toyoda, Shotaro Matsuda, Fumio Tod ...
1993 Volume 22 Issue 3 Pages
443-444
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1,6-Diselenapyrene, a first selenium analog of peri-condensed Weitz-type donors based on pyrene, and its methyl chalcogeno derivatives showed the relatively good donor ability. The relationship between the charge transfer energy and the stacking mode are discussed briefly.
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Yohji Misaki, Kazuya Kawakami, Hiroyuki Nishikawa, Hideki Fujiwara, To ...
1993 Volume 22 Issue 3 Pages
445-448
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The title compounds (
1) were prepared as the donor components for organic conductors. The molecular and crystal structures of bis(methylthio) derivative were determined by X-ray diffractional analysis. Among charge-transfer complexes and cation radical salts of
1 prepared so far, I
3− salt of unsubstituted-
1 and IBr
2− salt of methylenedithio-
1 showed metallic temperature dependence of conductivities.
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Pierre Laszlo, Jean Luchetti
1993 Volume 22 Issue 3 Pages
449-452
Published: 1993
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Solid acids such as the K10 montmorillonite are useful for preparation of porphyrins from pyrrole condensed with aldehydes. Combining the use of two different aldehydes A and B with unequal, statistical proportions of A and B allows maximization of the relative amount of the desired mixed porphyrin.
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Seiichi Matsugo, Satoshi Kumaki, Choichiro Shimasaki, Toshiaki Mori, I ...
1993 Volume 22 Issue 3 Pages
453-456
Published: 1993
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A significant formation of 8-hydroxydeoxyguanosine (8-OHdG) was observed in photoirradiation of “photo-Fenton reagent” (
1) with calf thymus DNA in maximum yield of 1.1%. The ten-fold enhancement of the formation of 8-OHdG compared to the control level was observed in photoirradiation of L5178Y cells with
1. The 8-OHdG formation well corresponds to the site specific DNA-cleaving activity of
1 upon photoirradiation.
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Sanshiro Komiya, Koji Nakada, Mitsuru Hirata, Atsushi Fukuoka
1993 Volume 22 Issue 3 Pages
457-460
Published: 1993
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Reactions of nitrato(triarylphosphine)gold(I) complexes [Au(PR
3)(NO
3)] with nucleosides such as guanosine (Guo), adenosine (Ado), and cytidine (Cyd) give new nucleoside-containing gold(I) complexes, [Au(PR
3)(Nuc)](NO
3) (R = Ph,
o-anisyl,
p-anisyl; Nuc = Guo, Ado, Cyd) in DMSO-d
6. NMR study reveals that the coordinated Guo ligand rapidly exchanges with free Guo by an associative mechanism.
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Sotaro Ito, Mamoru Takimura, Kazuo Sasaki
1993 Volume 22 Issue 3 Pages
461-464
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Dopamine (3,4-dihydroxyphenethylamine) was oxidized with O
2 in the presence of copper(II) sulfate and
L-ascorbic acid to yield norepinephrine under ambient conditions. The active species generated from this system was assigned to OH radical by means of OH radical scavenging method.
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Hisao Nemoto, Satoshi Iwamoto, Hiroyuki Nakamura, Yoshinori Yamamoto
1993 Volume 22 Issue 3 Pages
465-468
Published: 1993
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A p-boronophenylalanine (BPA) derivative, that is ca. thousand times more water-soluble and is incorporated with higher tumour/normal cell ratio than BPA itself, has been synthesized.
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Kentaro Takagi
1993 Volume 22 Issue 3 Pages
469-472
Published: 1993
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Arylzinc compounds containing electron-withdrawing groups such as CO
2CH
3, CON(CH
3)
2, CN, Br, Cl, or CF
3 at ortho position were prepared readily by the ultrasound-promoted reaction of aryl iodides with zinc powder, which were applied to palladium(0)-catalyzed cross-coupling with aryl halides to afford unsymmetrical and multifunctional biaryls in good yields.
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Yoshihisa Watanabe, Nori-aki Kawasaki, Hiro-aki Yamada, Kenji Wada, Ta ...
1993 Volume 22 Issue 3 Pages
473-476
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Iron/sulfur-catalyzed liquefaction of Yallourn coal using alcohol-carbon monoxide has been investigated. Pentacarbonyliron (Fe(CO)
5)/sulfur was found to be an excellent catalyst precursor. In the Fe(CO)
5/sulfur catalyzed liquefaction (375 °C-120 min) of Yallourn coal, high conversion (99.5%) was achieved in the presence of ethanol and CO.
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Hidenori Chikashita, Yusuke Nakamura, Hiromitsu Uemura, Kazuyoshi Itoh
1993 Volume 22 Issue 3 Pages
477-480
Published: 1993
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The asymmetric total synthesis of (6
S,7
S,9
R,10
R)-6,9-epoxy-nonadec-18-ene-7,10-diol, which is a lipid diol component of the brown alga,
Notheia anomala, was performed
via the stereocontrolled LiAlH
4 reduction of the cyclic hemiketal intermediate followed by the stereospecific one-step cyclodehydration of the resulting
anti 1,4-diol.
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Masazumi Ishikawa, Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara
1993 Volume 22 Issue 3 Pages
481-484
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Irradiation of a focused 1064 nm laser beam to an aqueous poly(N-isopropylacrylamide) solution resulted in the reversible microparticle (diameter ≈ 7 μm) formation through local heating of water by the laser beam and subsequent phase transition of the polymer solution. The microparticle produced was simultaneously manipulated in three-dimensional space by the incident 1064 nm laser beam.
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Hiroshi Sekiya, Reiner Lindner, Klaus Müller-Dethlefs
1993 Volume 22 Issue 3 Pages
485-488
Published: 1993
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The rotationally resolved zero-kinetic energy spectrum of benzene has been measured for ionization into the 6
1 level of the electronic ground state of benzene cation. Conclusive assignments have been given for the Jahn-Teller components j = 1/2 and j = ±3/2, arising from the linear and quadratic couplings.
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Koichi Narasaka, Hiroyuki Kusama, Yuko Yamashita, Hiroshi Sato
1993 Volume 22 Issue 3 Pages
489-492
Published: 1993
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Beckmann rearrangement of oximes is catalyzed with tetrabutylammonium perrhenate(VII), trifluoromethanesulfonic acid and hydroxylamine hydrochloride in nitromethane under azeotropic conditions, giving amides in high yield.
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Koji Araki, Sung Kil Lee, Joe Otsuki, Manabu Seno
1993 Volume 22 Issue 3 Pages
493-496
Published: 1993
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In the presence of appropriate pH-gradient across an organic liquid membrane, selective up-hill transport of SCN
− through the membrane was efficiently mediated by 6,6′-bis(4-hexylbenzoylamino)-2,2′-bipyridine upon complex formation with Cu
II, in which the metal center served as an SCN
−-selective binding site while pH-switched dissociation-association of the amide proton(s) of the ligand regulated uptake and release of SCN
−.
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Edward G. Janzen, Yong-Kang Zhang, Masana Arimura
1993 Volume 22 Issue 3 Pages
497-500
Published: 1993
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Paramagnetic impurities in nitrone spin traps are bothering researchers in the practice of spin trapping. By use of mass spectroscopy, a hydroxylamine dimer of 2,5,5-trimethylpyrroline-N-oxide (M
3PO) has been found in samples of M
3PO. Air oxidation of the hydroxylamine may produce the aminoxyl radical impurity detected. Mechanisms for the generation of impurities in DMPO and derivatives are proposed.
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Akira Miyashita, Shinji Nakano, Masafumi Hirano, Hiroyuki Nohira
1993 Volume 22 Issue 3 Pages
501-504
Published: 1993
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A series of novel negative photochromic poly(methyl methacrylate) having spirobenzoselenazolinobenzopyran side groups was newly synthesized, and their reversible photochemical color changes were studied: their metastable colorless spiro-forms induced by Vis light irradiation was stabilized more than 90 days, although that dispersed in polymer film was thermally unstable turning to the stable merocyanine-form. Kinetic study to investigate their thermocoloration process was performed.
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Masaru Kimura, Hideki Nishikawa, Hisanori Kura, Hyung Lim, Emil H. Whi ...
1993 Volume 22 Issue 3 Pages
505-508
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A bell shape correlation curve has been found for a plot of the Hammett σ constant and the quantum yields of the formation of excited amidines from the chemiluminescent reaction of 2-(p-dimethylaminophenyl)-4,5-di(p-X–phenyl)-4-hydroperoxy-4H-isoimidazoles (X = OCH
3, H, F, Cl, CF
3, and CN) with bases.
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Tsuyoshi Fukuhara, Norihiko Yoneda
1993 Volume 22 Issue 3 Pages
509-512
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Heteroaromatic halides such as 2-chloropyrimidines and 2-chloropyridines, and 2,4-dinitrochlorobenzene underwent halogen-exchange fluorination with the treatment of HF or HF-base solutions to afford the corresponding fluorides in good yields.
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Shuji Aonuma, Hiroshi Sawa, Reizo Kato, Hayao Kobayashi
1993 Volume 22 Issue 3 Pages
513-516
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The Cu salts of selectively deuterated DMe-DCNQI’s were prepared, and the electrical conductivities were examined. By deuteration of two hydrogens of the methyl groups, a drastic metal-insulator-metal transition was induced for the first time in a non-alloy system at ambient pressure. On the other hand, deuteration of two ring hydrogens or one methyl hydrogen did not affect the stability of a metallic state down to 4.2 K. These phenomena are discussed in terms of the “chemical pressure” effect.
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Shouji Iwatsuki, Masataka Kubo, Hironori Iwase
1993 Volume 22 Issue 3 Pages
517-520
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2,5-Bis[4′-(dimethylamino)pyridinio]-3,6-difluoro-7,7,8,8-tetracyanoquinodimethane bis(trifluoromethanesulfonate) was obtained as a 1:1 charge-transfer complex with 4-(dimethylamino)pyridine in the reaction of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (TCNQF
4) with N-trimethylsilyl-4-(dimethylamino)pyridinium trifluoromethanesulfonate. Its first reduction potential was measured in cyclic voltammetry to be as high as 0.96 V (vs. Ag/AgCl), exceeding that of 2,5,7,7,8,8-hexacyanoquinodimethane (TCNQ(CN)
2) by 0.29 V.
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Toshiro Chiba, Mitsuhiro Okimoto
1993 Volume 22 Issue 3 Pages
521-524
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Dimethyl oxaldiimidate could be obtained in good yield by the electrolytic oxidation of methanolic solution of sodium cyanide in a divided cell using a carbon anode. Analogous electrolysis in an undivided cell gave dimethyl imidocarbonate as the main product.
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Hiroyoshi Yamazaki, Nobuyoshi Hayashi
1993 Volume 22 Issue 3 Pages
525-528
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The rate constants for the carboxylation of a series of aliphatic Grignard reagents were measured as part of the development of a computer assisted automated synthesis apparatus. A good correlation was obtained between the rate constants and Taft’s Es values.
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Go Hata, Hideki Kawai, Tatsuya Kaneko, Takayuki Imaoka, Yukishige Kita ...
1993 Volume 22 Issue 3 Pages
529-532
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The reaction of dihydroxo[(1
R,2
R)-cyclohexanediamine]platinum(II) with 3-acetyl-2,4-(3
H,5
H)-furandiones gave salts consisting of [3-acetyl-2,4(3
H,5
H)-furandionato-
O3,
O4] [(1
R,2
R)-cyclohexanediamine]platinum(1+) ions and enolates of 3-acetyl-2,4-(3
H,5
H)-furandiones. The complexes show high solubility, and antitumor activity at low doses against murine leukemia L1210 sensitive and resistant to
cis-dichlorodiammineplatinum(II).
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Masatoshi Kozaki, Shoji Tanaka, Yoshiro Yamashita
1993 Volume 22 Issue 3 Pages
533-536
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The title 1,3-dithiole compounds which were synthesized using a Wittig-Hornor reaction have a planar structure with both inter- and intramolecular short S···S contacts. Their electrochemical oxidation gave polythiophene derivatives which have lower oxidation potentials than polythiophene and the conductivity of the nonsubstituted derivative was 3.5 × 10
−3 S cm
−1.
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Hidenori Ikezawa, Eiichi Miki, Kunihiko Mizumachi, Tatsujiro Ishimori, ...
1993 Volume 22 Issue 3 Pages
537-540
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The reversible thermal isomerization among the trans and two kinds of cis geometrical isomers of [RuCl(2mqn)
2(NO)] (2mqn = 2-methyl-8-quinolinolate ion) was observed in degassed DMSO (dimethyl sulfoxide) at higher than 363 K. The mole ratio of the cis-1, the cis-2, and the trans isomers was 20 : 9 : 1 after the equilibrium was reached at 413 K, and it did not depend on the starting species.
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Hiroaki Tanaka, Hirotaka Nagao, Koji Tanaka
1993 Volume 22 Issue 3 Pages
541-544
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In order to evaluate the acidity of CO
2 in protic media, interaction of CO
2 with reduced 2,3,5,6-tetramethylquinone (TMQ) was investigated by means of cyclic voltammetry in CH
3CN, CH
3OH, and CH
3CN / H
2O. Predominant carboxylation of TMQ in CH
3OH and CH
3CN / H
2O (9:1 v/v) indicates that the acidity of CO
2 is almost equivalent or stronger than that of proton in those media.
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Nobuharu Iwasawa, Masahiro Funahashi, Satoshi Hayakawa, Koichi Narasak ...
1993 Volume 22 Issue 3 Pages
545-548
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Bicyclic cyclopropanols having olefinic side chain are oxidized with Mn(pic)
3 to generate cyclic β-keto radicals with ring-expansion, which cyclize intramolecularly affording bicyclic radical intermediates. The cyclized radicals are trapped with various radical-trapping reagents such as electron-rich or -deficient olefins, tributyltin hydride and diphenyl diselenide to give the corresponding functionalized products.
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Koichi Shibata, Oyo Mitsunobu
1993 Volume 22 Issue 3 Pages
549-552
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Reaction of alcohols with 2-(1,2-diphenyl-2-oxoethylseleno)benzothiazole in the presence of tributylphosphine gave the corresponding 2-alkylselenobenzothiazoles, where inversion of the secondary carbinol center of the alcohols took place. 1,3-Butanediol reacted at the primary hydroxyl group, while 1-phenyl-1,2-ethanediol reacted at the secondary hydroxyl group.
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Jun-ichi Kikuchi, Toru Takashima, Hidetoshi Nakao, Ken-ichi Hie, Hiros ...
1993 Volume 22 Issue 3 Pages
553-556
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The aldolation of glycine with benzaldehyde to yield β-phenylserine was catalyzed by supramolecular assemblies formed with a synthetic peptide lipid, a hydrophobic vitamin B
6 derivative, and zinc(II) ions in aqueous media under mild conditions. A diastereomeric ratio of the reaction products was much dependent on a size and a phase property of the vesicular catalyst.
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Kozo Shishido, Takeshi Takata, Tomoki Omodani, Masayuki Shibuya
1993 Volume 22 Issue 3 Pages
557-560
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Employing a strategy for the construction of fused furans based on an intramolecular [3+2] dipolar cycloaddition reaction of nitrile oxide, the BCD ring system
3 found in the tanshinone family as a common structural unit has been synthesized.
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Li-Biao Han, Nobuaki Kambe, Ilhyong Ryu, Noboru Sonoda
1993 Volume 22 Issue 3 Pages
561-564
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The reaction of bis(2-oxoalkyl)tellurium dichlorides (
1) with a base gave either 1,4-dioxo-2-alkenes or 1,2,3-triacylcyclopropanes depending on the conditions employed. The reaction of
1 with LDA followed by the addition of an aldehyde led to the Wittig-type olefination to give
E-α,β-unsaturated ketones in good yields. The cyclopropanes and 1,4-dioxo-2-alkenes could also be synthesized conveniently by a one-pot procedure from the corresponding ketones by the aid of TeCl
4 and LDA.
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Katsuya Maruo, Yuji Wada, Shozo Yanagida
1993 Volume 22 Issue 3 Pages
565-566
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18O Tracer study of perfluorinated poly(
p-phenylene)-catalyzed photohydroxylation of benzene to phenol with H
218O and
16O
2 revealed that the hydroxylation initially occurs by the attack of the hydroxyl radical (H
18O
•) generated by the photooxidation of H
218O, but the hydroxyl radical (H
16O
•) derived from the concurrently produced H
216O
2 comes to participate in further hydroxylation as the photocatalysis proceeds.
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Toshimi Shimizu, Hiroyuki Minamikawa, Teiichi Murakami, Masakatsu Hato
1993 Volume 22 Issue 3 Pages
567-570
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Novel glycolipids having a
L-serine derivative as the hydrophobic region, have been synthesized as a model glycosphingolipid. Differential Scanning Calorimetry and polarizing microscopic study of the aqueous dispersion exhibited a polymorphism similar to that observed for certain glycosphingolipids. Significantly higher chain order-disorder transition temperature was also observed for a galactolipid than for a glucolipid.
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Toshiaki Yokoo, Kozo Matsumoto, Koichiro Oshima, Kiitiro Utimoto
1993 Volume 22 Issue 3 Pages
571-572
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Treatment of a 1,2-dichloroethane solution of various alcohols with iodosylbenzene in the presence of a catalytic amount of ytterbium(III) nitrate provided the corresponding carbonyl compounds in good to excellent yields.
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Akira Oku, Yasuyoshi Ose, Tohru Kamada, Tomohiro Yoshida
1993 Volume 22 Issue 3 Pages
573-576
Published: 1993
Released on J-STAGE: April 26, 2006
JOURNAL
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The title compound was prepared by the treatment of the corresponding 1,1-dibromocyclopropane with lithium naphthalene radical anion (Li-C
10H
8). Trapping of the dilithio compound by chlorotrimethylsilane provided evidence for its highly basic profile which can compete with silylation.
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Ken-ichi Sakai, Umpei Nagashima, Shoji Fujisawa, Akira Uchida, Shigeru ...
1993 Volume 22 Issue 3 Pages
577-580
Published: 1993
Released on J-STAGE: April 26, 2006
JOURNAL
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The photooxygenation of diphenanthro[5,4,3-abcd:5′,4′,3′-jklm]perylene (DPP) is investigated by using semi-empirical molecular orbital methods. It was shown theoretically that molecular oxygen (O
2) attaches to the central part of DPP, causing a large bend of the molecular plane. The experimental observation was reasonably explained on the basis of the calculated oscillator strengths of optically allowed transitions in DPP and photooxygenated DPP.
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Koki Matsubara, Teruaki Mukaiyama
1993 Volume 22 Issue 3 Pages
581-584
Published: 1993
Released on J-STAGE: April 26, 2006
JOURNAL
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In the presence of a catalytic amount of SnCl
3(ClO
4) or SiCl
3(ClO
4), O-(2-azido-2-deoxy-α-D-galactopyranosyl)-L-serine and -L-threonine are stereoselectively synthesized in excellent yields from 1-O-acetyl-2-azido-2-deoxy-3,4,6-tri-O-benzyl-D-galactopyranose and trimethylsilylated L-serine or L-threonine, respectively.
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