-
Masatoshi Osawa, Hiroshi Sakurai, Katsuya Ito, Wataru Suëtaka
1990 Volume 19 Issue 6 Pages
839-842
Published: 1990
Released on J-STAGE: April 03, 2006
JOURNAL
RESTRICTED ACCESS
Infrared spectra of CO adsorbed on Pt electrodes modified with underpotentially deposited Bi adatoms have been measured
in situ as a function of Bi coverage (θ
Bi). Shape and position of the C–O stretching band changed depending upon θ
Bi. The observed spectral changes are explained by dipole coupling between CO molecules. Structure of Bi adlayer is discussed from the spectra of CO.
View full abstract
-
Tadashi Hara, Kazuhiko Tsukagoshi, Toshihito Imai, Naoki Yoshida, Riic ...
1990 Volume 19 Issue 6 Pages
843-846
Published: 1990
Released on J-STAGE: April 03, 2006
JOURNAL
RESTRICTED ACCESS
L-tryptophan was found for the first time to show the chemiluminescence in the copper(II)–hydrogen peroxide–potassium sodium tartrate system with its maximum chemiluminescence intensity at about 3 h. Other α-amino acids such as
L-histidine,
L-methionine, and
L-isoleucine showed no chemiluminescence.
L-tryptophan in the concentration range of 1.0 × 10
−5–1.0 × 10
−3 mol dm
−3 apparently showed the chemiluminescence corresponding to its concentration.
View full abstract
-
Hideo Furuuchi, Tatsuo Arai, Yasunao Kuriyama, Hirochika Sakuragi, Kat ...
1990 Volume 19 Issue 6 Pages
847-848
Published: 1990
Released on J-STAGE: April 03, 2006
JOURNAL
RESTRICTED ACCESS
On triplet sensitized excitation
N-methoxy-1-(2-anthryl)ethanimine underwent Z → E one-way isomerization, while no reverse isomerization took place. Photostationary state isomer compositions, quantum yields, and transient absorption spectra indicate an adiabatic quantum chain process in the isomerization as proposed for 2-anthrylethylenes.
View full abstract
-
Takashi Yamanoi, Toshiyuki Inazu
1990 Volume 19 Issue 6 Pages
849-852
Published: 1990
Released on J-STAGE: April 03, 2006
JOURNAL
RESTRICTED ACCESS
Several 2-deoxy-α-glucosides were obtained in good yields with high stereoselectivity by glycosylation reaction of the corresponding alcohols with 3,4,6-tri-
O-benzyl-2-deoxy-β-
D-glucopyranosyl dimethylphosphinothioate in the presence of a catalytic amount of triphenylmethylium perchlorate or an equivalent amount of silver perchlorate.
View full abstract
-
Naohide Matsumoto, Masatomi Sakamoto, Hiroko Tamaki, Hisashi Okawa, Si ...
1990 Volume 19 Issue 6 Pages
853-854
Published: 1990
Released on J-STAGE: April 03, 2006
JOURNAL
RESTRICTED ACCESS
Ferromagnetic spin-coupling between Cu(II) and Gd(III) ions was observed in a binuclear Cu(II)–Gd(III) complex CuGd(fsaen)NO
3·4H
2O (H
4fsaen =
N,
N′-bis(3-carboxysalicylidene)ethylenediamine). The magnetic behavior was well reproduced by the equation derived from H = −2JS
Cu·S
Gd (S
Cu = 1/2, S
Gd = 7/2) with g = 2.01 and J = +1.7 cm
−1.
View full abstract
-
Keiji Iriyama, Toshinari Araki, Akira Tanaka, Takashi Iwasaki
1990 Volume 19 Issue 6 Pages
855-858
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Electron microscopic technique allowed the visualization of a pattern in a monolayer similar to that in marbling with Chinese ink on the electron microscopic scale. On the basis of the visualized pattern, the origin of structural defects in a monolayer was speculated.
View full abstract
-
Keiji Iriyama, Akira Tanaka, Toshinari Araki, Sei-ichi Yokoi, Naoki Sh ...
1990 Volume 19 Issue 6 Pages
859-862
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Electron microscopic examinations of Langmuir–Blodgett film structure were able to help the preparation of the film systems without any micro-pores on the electron microscopic scale.
View full abstract
-
Masaharu Tsuji, Minoru Sakumoto, Hiroshi Obase, Yukio Nishimura
1990 Volume 19 Issue 6 Pages
863-866
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Silicon has been directly oxidized by using oxygen atoms produced from an ArF excimer laser photolysis of N
2O. Uniform Si
2O films with a thickness of < 130 Å were grown at the substrate temperature range of 30–500 °C and a laser power of about 150 mJ. The dependence of the film thickness on the laser shots, the substrate temperature, and the N
2O pressure was examined.
View full abstract
-
Masanori Wada, Mituyuki Kanzaki, Masanobu Fujiwara, Kazuhisa Kajihara, ...
1990 Volume 19 Issue 6 Pages
867-870
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Tris(2,6-dimethoxyphenyl)phosphine sulfide reacted with alkyl iodides or bromides under mild conditions to give stable alkylthiophosphonium salts, which reacted with thiols at room temperature in the presence of a catalytic amount of tris(2,6-dimethoxyphenyl)phosphine to give the tertiary phosphonium salt and unsymmetrical disulfides.
View full abstract
-
Shunichi Fukuzumi, Tomohiro Yorisue
1990 Volume 19 Issue 6 Pages
871-874
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
One-electron reduction of nitrite to nitric oxide proceeds efficiently by an acid-stable NADH analog, 9,10-dihydro-10-methylacridine (two-electron reductant) as well as 1,1′-dimethylferrocene (one-electron reductant) in the presence of perchloric acid in acetonitrile. The effects of dioxygen on both the one-electron and two-electron reductant systems are compared.
View full abstract
-
Mariko Ishiwatari, Ryoshi Ishiwatari, Haru Sakashita, Takashi Tatsumi, ...
1990 Volume 19 Issue 6 Pages
875-878
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Pyrolysis of chlorophyll-
a preheated at 250 °C has been carried out to investigate the precursor of 1-pristene often observed in pyrolysis products of kerogens. The 1-pristene/(phytadienes + phytene) ratio increased with increasing preheating time, suggesting the significance of the moiety derived from chlorophyll as the precursor of 1-pristene.
View full abstract
-
Wataru Ueda, Satoshi Tomioka, Yutaka Morikawa, Motonori Sudo, Tsuneo I ...
1990 Volume 19 Issue 6 Pages
879-880
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Various metal oxides have been examined as catalysts for the hydrodechlorination of CFC-113 to form 1-chloro-1,2,2-trifluoroethylene (CFC-1113). NiO was most effective and over silica gel- or Y zeolite-supported Ni catalyst, 100% conversion of CFC-113 and 96% selectivity to CFC-1113 were attained.
View full abstract
-
Masaharu Tsuji, Minoru Sakumoto, Yuichi Fujii, Hiroshi Obase, Yukio Ni ...
1990 Volume 19 Issue 6 Pages
881-884
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Silicon was directly oxidized by using O atoms and OH radicals produced from the Ar afterglow reactions of O
2, N
2O and H
2O at substrate temperatures below 350 °C. Uniform thin SiO
2 films were grown in all cases. The maximum film thickness was limited to about 20 Å by diffusion of oxidation species across the grown film.
View full abstract
-
Michio Zenki, Jun Ohtani, Takahiko Ikeda, Kyoji Tôei
1990 Volume 19 Issue 6 Pages
885-888
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Separation and determination of boric acid by reversed-phase liquid chromatography with conductivity detection have been demonstrated. D-Sorbitol was used as a precolumn complexing agent for boric acid and water as the mobile phase. The detection limit was 20 ng ml
−1.
View full abstract
-
Teruaki Mukaiyama, Hidekazu Akamatsu, Jeong Sik Han
1990 Volume 19 Issue 6 Pages
889-892
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
In the presence of a catalytic amount of iron(II) iodide or trityl hexachloroantimonate, ketene silyl acetals smoothly react with imines to afford the corresponding β-aminoesters in good yields with anti-selectivities.
View full abstract
-
Shigenobu Kawakami, Shingo Iwaki, Aiming Yu, Masashiro Nakada, Tatsuak ...
1990 Volume 19 Issue 6 Pages
893-896
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
4,4′-Dimethylbibenzyl was produced in high yield with [2.2]paracyclophane and toluene as by-products by the dehydrogenative coupling of p-xylene under a temperature gradient system, i.e., the thermal diffusion reactor. The results were different from those by the conventional tube reactors where far less selectivity for 4,4′-dimethylbibenzyl was obtained.
View full abstract
-
Toshikazu Kitagawa, Jiro Toyoda, Kazuhiro Nakasuji, Hiroshi Yamamoto, ...
1990 Volume 19 Issue 6 Pages
897-900
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The redox potentials of sixteen substituted
p-benzoquinones were measured by cyclic voltammetry. In addition to the first and the second reduction potentials, the first oxidation potential showed linear dependence on Σ(σ
m + σ
p)/2 Hammett constant for a wide range of substituents.
View full abstract
-
Jun-ichi Sakaki, Miwako Suzuki, Satoshi Kobayashi, Masayuki Sato, Chik ...
1990 Volume 19 Issue 6 Pages
901-904
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Prochiral ketones having 6-(4-oxo-1,3-dioxinyl) group as one terminal unit by fermenting baker’s yeast gave chiral alcohols, which could be convertible to optically active hydroxyesters, β-ketoesters, and lactones.
View full abstract
-
Kazuhiko Saigo, Shigeru Shimada, Masaki Hasegawa
1990 Volume 19 Issue 6 Pages
905-908
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
In the presence of titanium(IV) chloride, ethyl 2,2-dialkoxycyclopropanecarboxylates reacted with imines to give γ-lactams. Especially, when
N-tosyl aldimines were employed,
cis-3,4-disubstituted γ-lactams were obtained in good yields with high diastereoselectivity.
View full abstract
-
Yoshio Okamoto, Yuriko Kaida, Hiromi Hayashida, Koichi Hatada
1990 Volume 19 Issue 6 Pages
909-912
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
(
R)-, (
S)-, and (
RS)-1-phenylethylcarbamates of cellulose and amylose were synthesized and used as chiral stationary phases for high-performance liquid chromatography. The chiral recognition abilities of the 1-phenylethyl derivatives depended greatly on the chirality of 1-phenylethyl groups. Among six derivatives, amylose tris((
S)-1-phenylethylcarbamate) showed high optical resolving ability for many compounds.
View full abstract
-
Masahito Sekiguchi, Akiya Ogawa, Shin-Ichi Fujiwara, Ilhyong Ryu, Nobu ...
1990 Volume 19 Issue 6 Pages
913-916
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
New selenium-containing heterocyclic compounds, 6
H-1,3,5-oxaselenazines, have been synthesized stereoselectively by the reaction of selenoamides with aldehydes in the presence of boron trifluoride etherate complex.
View full abstract
-
Akira Harada, Kazutake Okamoto, Mikiharu Kamachi, Takeshi Honda, Toshi ...
1990 Volume 19 Issue 6 Pages
917-918
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Monoclonal antibodies against tetracarboxyphenylporphyrin(TCPP) were prepared by immunizing Balb/c mice with TCPP bound keyhole limpet hemocyanin covalently and fusing the spleen cells with myeloma cells by using poly(ethylene glycol). The antibodies bind TCPP strongly with the dissociation constants of 10
−6 − 2.5 × 10
−7 M.
View full abstract
-
Takashi Kato, Akira Fujishima, Jean M. J. Fréchet
1990 Volume 19 Issue 6 Pages
919-922
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
A new type of twin liquid crystalline complex having two terminal mesogenic units and a central flexible spacer has been formed through intermolecular hydrogen bonds between a nonmesogenic aliphatic diacid and mesogenic stilbazoles.
View full abstract
-
Masatatsu Suzuki, Hitoshi Senda, Machiko Suenaga, Toshiharu Sugisawa, ...
1990 Volume 19 Issue 6 Pages
923-926
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
A novel linear tetranuclear manganese(II,III,IV,II) complex, was prepared, [Mn
4(tpdp)
2(O)
2(H
2O)
4](ClO
4)
5·4H
2O, where Htpdp is 1,3-bis[bis(2-pyridylmethyl)amino]-2-propanol, and its crystal structure was determined by X-ray structure analysis. The complex cation consists of di(μ-oxo)dimanganese(III,IV) mixed valent unit to which two manganese(II) ions are linked by the alkoxo bridges of tpdp, forming a linear tetranuclear structure Mn(II,III,IV,II).
View full abstract
-
Shin-ichi Fukuzawa, Tatsuo Fujinami, Shizuyoshi Sakai
1990 Volume 19 Issue 6 Pages
927-930
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Allylic phenyl selenides are prepared efficiently from the reaction of allylic acetates and diphenyl diselenide induced by samarium(II) diiodide in the presence of a palladium catalyst under mild conditions.
View full abstract
-
Masashi Kanemoto, Tsutomu Shiragami, Chyongjin Pac, Shozo Yanagida
1990 Volume 19 Issue 6 Pages
931-932
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Photoreduction of CO
2 to formic acid and a small quantity of CO can be achieved effectively in water by using defect-free ZnS quantum crystallites and their aggregates as catalysts and S
2− and H
2PO
2− ions as sacrificial electron donors under >290-nm irradiation.
View full abstract
-
Masaru Hasegawa, Yukinobu Hayashi, Yoshifumi Arai, Genzo Hashizume, Se ...
1990 Volume 19 Issue 6 Pages
933-936
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The aggregate morphologies formed from 4,4′-bis(3-decylureido)-diphenylmethane in a mineral oil at 180 °C were investigated by electron microscopy. The formed aggregates consisted of fiber with the tube-like shape which had not been observed in lubricating grease, and helices.
View full abstract
-
Takuji Ogawa, Kazuo Hayami, Hironobu Iyama, Hitomi Suzuki
1990 Volume 19 Issue 6 Pages
937-940
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Carbanions derived from cyclic 1,3-dicarbonyl compounds reacted smoothly with some vinyl bromides and 1,3-enones in HMPA in the presence of copper(I) iodide to give geminally disubstituted alkanes in good yields. The products were easily dehydrated intramolecularly to form 4H-pyran derivatives almost quantitatively.
View full abstract
-
Kazuhiko Saigo, Kazuaki Kudo, Yukihiko Hashimoto, Hiroki Kimoto, Masak ...
1990 Volume 19 Issue 6 Pages
941-944
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
α-Sulfenyl acetals reacted smoothly with silylated carbon nucleophiles such as silyl enol ether, ketene silyl acetal, and allylsilane in the presence of a catalytic amount of Lewis acid mainly to give
anti-Cram adducts with high diastereoselectivity by the asymmetric induction of the α-sulfur atom of the acetals.
View full abstract
-
Yuko Yamashoji, Minoru Tanaka, Toshiyuki Shono
1990 Volume 19 Issue 6 Pages
945-948
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The host-guest interaction of cyclodextrins (CDs) with L-alanine β-naphthylamide hydrobromide (L-AN) and DL-AN hydrochloride (DL-AN) was studied by
1H NMR. The inclusion complex formation of the guests with β- and γ-CDs in aqueous solution was confirmed by remarkable changes in their chemical shifts. In the case of α-CD, such remarkable changes were not induced, indicating weak or no interaction between the host and the guests.
View full abstract
-
Akira Kai, Hiroyasu Kido, Norikazu Ishida
1990 Volume 19 Issue 6 Pages
949-952
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
It was found that the structure of cellulose obtained from the
Acetobacter-culture in the presence of the direct dye of cellulose is fixed in a priori by the structure of a dye. The product from the culture with a direct red 80 formed the cellulose II, and it, from culture with a congo red formed the cellulose IV.
View full abstract
-
Zempachi Ogumi, Yoshiharu Uchimoto, Kazuaki Yasuda, Zen-ichiro Takehar ...
1990 Volume 19 Issue 6 Pages
953-954
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
An ultra-thin membrane containing sulfonic ester group was prepared by plasma polymerization of methyl benzenesulfonate and 1,3-butadiene. The sulfonic ester group of the plasma polymer was transformed to lithium sulfonate group by treatment with lithium iodide. The resultant ultra-thin cation exchange membrane was about 0.2 μm thick and pinhole-free, and showed high K
+ ion transference number of 0.92 in the aqueous KCl system and resistance of 1.3 Ωcm
2.
View full abstract
-
Kiyomi Okabe, Nobuyuki Matsubayashi, Hiromichi Shimada, Hiroyuki Hagiw ...
1990 Volume 19 Issue 6 Pages
955-958
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Hydrothermal synthesis of ferrisilicate of ZSM-5 structurewas followed by FT-IR, XRD, XPS, XRF, TG, and EXAFS. It was found that the micro-structure around Fe formed before instantaneous crystallization of the bulk.
View full abstract
-
Hiroaki Ozaki, Akio Nakamoto, Takeo Shimidzu
1990 Volume 19 Issue 6 Pages
959-962
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Sequence-defined Oligoribonucleotides having 2′-5′ and/or 3′-5′ phosphodiester linkage have been synthesized by use of 5′-protected ribonucleoside 2′,3′-cyclic phosphoramidite on solid support. In coupling reaction, pKa of azole as a catalyst governs the activation. The resulting 2′-5′ and/or 3′-5′ linked Oligoribonucleotides were easily separated by reversed-phase chromatography.
View full abstract
-
Masashi Ishikawa, Shunichi Fukuzumi
1990 Volume 19 Issue 6 Pages
963-966
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Acridine Derivatives (9,10-dihydro-10-methylacridine and acriflavine) act as efficient and stable photocatalysts for reductive dechlorination of
p-chlorobiphenyl as well as dehalogention of bromochlorobenzenes with sodium borohydride in acetonitrile/H
2O (9:1 v/v) at 298 K. In the case of acriflavine, the limiting quantum yield at irradiation wavelength λ = 350 nm has reached 0.63.
View full abstract
-
Jean-Luc Dubois, Michel Bisiaux, Hubert Mimoun, Charles J. Cameron
1990 Volume 19 Issue 6 Pages
967-970
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
X-Ray photoelectron spectroscopic studies of lanthanum oxide based oxidative coupling of methane catalysts, indicate a high binding energy O(1s) peak at 532.6–533.2 eV, which is strong evidence for surface superoxide (O
2−) or peroxycarbonate (CO
4=).
View full abstract
-
Kohei Shiraisffi, Koichi Kato, Kazuo Sugiyama
1990 Volume 19 Issue 6 Pages
971-974
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
A novel terminal-terminal type of ferroelectric liquid crystal, (
S)-bis(2-methylbutyl) 3,3′-[1,20-eicosanediylbis[oxy-4,1-phenylenemethylidynenitrilo-4,1-phenylene]]bis[2-propenoate] (BMBEPMNP), was prepared, which composed of two chiral mesogenic groups interconnected by a very long flexible spacer chain. From the electrooptical effect originating in deformation of helical structure at a S
c* state, the electrooptical response time (τ
sr) was found to be 843 μs at 130 °C in 32 kV·cm
−1.
View full abstract
-
Takahisa Akatsuka, Hideaki Tanaka, Jiro Toyama, Takayoshi Nakamura, Ya ...
1990 Volume 19 Issue 6 Pages
975-978
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Highly conductive Langmuir–Blodgett (LB) films were obtained by the pyrolysis of polyimide LB films at 1000 °C in vacuum or under nitrogen atmosphere. The films showed the conductivity of as high as 300 S/cm, depending on the thickness of the film. The highest conductivity so far obtained was 600 S/cm. The film was stable under ambient conditions over months.
View full abstract
-
Naomichi Furukawa, Satoshi Ogawa, Kazunori Matsumura, Tadao Shibutani, ...
1990 Volume 19 Issue 6 Pages
979-982
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Diaryl sulfoxides bearing ortho-sulfur substituents react readily with Grignard reagents on the sulfur atom to produce the corresponding phenyl Grignard reagents bearing ortho-sulfur functional group. Furthermore, thianthrene monooxide was found to react with alkyl Grignard reagents affording o,o′-bis-Grignard reagent of diphenyl sulfide which was converted easily to Martin’s sulfurane.
View full abstract
-
Jennifer C. Dutton, Gary D. Fallon, Keith S. Murray
1990 Volume 19 Issue 6 Pages
983-986
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The X-ray crystal structure of a planar [Ni
IIN
2S
2]
2− complex containing the tetraanionic form of the ligand
N,
N′-ethylenebis(
o-mercaptobenzamide) is described. Comments are made in relation to a recent paper by Yamamura et al.,
3 in which a binuclear [Ni
IIS
2O
2]
2 derivative of the dianionic form of the ligand is described and to the earlier paper of Krüger and Holm
5 who first described the present complex.
View full abstract
-
Fumio Toda, Yoshihisa Tokumaru
1990 Volume 19 Issue 6 Pages
987-990
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Oxidative coupling of acetylene compound with cupric salt in the solid state was found to proceed efficiently and selectively. The coupling reaction of α,ω-diacetylenes in the solid state gave the linear oligomers in contrast with the formation of the cyclic products in the solution reaction.
View full abstract
-
Masahiko Saburi, Ko Aoyagi, Hiroshi Takeuchi, Tamotsu Takahashi, Yasuz ...
1990 Volume 19 Issue 6 Pages
991-994
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The Ru(II) molecular hydrogen complex [RuH(η
2-H
2)(diop)
2]
+ was prepared
in situ from [RuH(diop)
2]
+ and H
2 gas. The low temperature (213–243 K)
1H and
31P NMR data of this η
2-H
2 complex indicated the coexistence of two isomers (
trans and
cis) at equilibrium in solution. At 303 K the coalescence of Ru-H and Ru-(η
2-H
2) resonances due to their rapid exchanges was observed.
View full abstract
-
Seiji Ujiie, Kazuyoshi Iimura
1990 Volume 19 Issue 6 Pages
995-998
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Thermotropic liquid-crystalline polyethylenimines with an ammonium halide moiety and those low-mass model compounds exhibited enantiotropically smectic phases. They were homeotropically aligned with the formation of an ammonium bilayer. The homeotropic structure of the liquid-crystalline polyethylenimine remained unaltered below Tg on cooling.
View full abstract
-
Toshimi Okada, Toshiaki Morimoto, Kazuo Achiwa
1990 Volume 19 Issue 6 Pages
999-1002
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
It was found that the palladium complexes of newly prepared chiral (β-aminoalkyl)phosphine derivatives bearing
N-sulfonyl groups were efficient catalysts for asymmetric hydrosilylations of cyclopentadiene and styrene with chlorosilanes.
View full abstract
-
Masato Yoshikawa, Takashi Sugimura, Akira Tai
1990 Volume 19 Issue 6 Pages
1003-1004
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
A new type diastereo-differentiating isomerization of meso 3,4-epoxycyclopentanone carrying a chiral diol as ketal to give 4-hydroxy-2-cyclopentenone ketals was demonstrated in a ratio of up to 87.7 to 12.3.
View full abstract
-
Masao Okubo, Mikio Tanaka, Koji Matsuo
1990 Volume 19 Issue 6 Pages
1005-1008
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
N,
N′-Diarylformamidines were obtained in good yields by the reaction of aryliminodimagnesium (ArN(MgBr)
2) with
N,
N-dimethylformamide in the presence of nitrobenzene. Novel catalytic mediation by single electron transfer was disclosed.
View full abstract
-
Keiki Kishikawa, Kohji Horie, Makoto Yamamoto, Shigeo Kohmoto, Kazutos ...
1990 Volume 19 Issue 6 Pages
1009-1010
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
The relation between the separability and the stereochemistry of the acylurea derivatives prepared from chiral mono-, bi- and tricyclic acids and
N,
N′-bis((
S)-1-phenylethyl)carbodiimide were investigated. Conventionally separated diastereomers by silica gel column chromatography were converted to optically pure methyl esters of the corresponding acids upon methanolysis.
View full abstract
-
Osamu Kitagawa, Akihiko Miura, Yoshiro Kobayashi, Takeo Taguchi
1990 Volume 19 Issue 6 Pages
1011-1014
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Radical chain reaction of difluoroiodoacetate with olefins catalyzed by copper provided atom-transfer products in good yields.
View full abstract
-
Teruaki Mukaiyama, Atsuro Inubushi, Shinji Suda, Ryuichiro Hara, Shu K ...
1990 Volume 19 Issue 6 Pages
1015-1018
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
In the presence of a catalytic amount of [(R)-1,1′-bi-2-naphthalenediolato(2−)-O,O′]oxotitanium, silyl enol ethers of thioesters react with aldehydes to afford the corresponding aldol adducts in high yields with good to high ees.
View full abstract
-
Teruaki Mukaiyama, Hiromi Uchiro, Isamu Shiina, Shu Kobayashi
1990 Volume 19 Issue 6 Pages
1019-1022
Published: 1990
Released on J-STAGE: May 09, 2006
JOURNAL
RESTRICTED ACCESS
Anti-α,β-dihydroxy thioesters are prepared with excellent enantioselectivities by the asymmetric aldol reaction between both achiral aldehydes and silyl enol ethers derived from α-benzyloxy thioesters in the presence of a chiral promoter consisted of chiral diamine coordinated tin(II) triflate and dibutyltindiacetate.
View full abstract
