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Ji-ben Meng, Zuo-lin Zhu, Ru-ji Wang, Xin-kan Yao, Yoshikatsu Ito, Hir ...
1990 Volume 19 Issue 8 Pages
1247-1248
Published: 1990
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The photoreactions of 6-cyanouracils with aromatic hydrocarbons in the solid state proceed with a selectivity different from that in solution.
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Junzo Sunamoto, Mitsuaki Goto, Kazunari Akiyoshi
1990 Volume 19 Issue 8 Pages
1249-1252
Published: 1990
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Several proteins were directly and effectively transferred from human erythrocyte membranes to dimyristoylphosphatidylcholine (DMPC) liposomes which contain an artificial boundary lipid (1,2-dimyristoylamido-1,2-deoxyphosphatidylcholine, DDPC). Of the membrane proteins, the activity of acetylcholine esterase (AchE) was monitored. The activity of AchE and the amount of total protein transferred were highest when 40 mol% of DDPC was added to DMPC.
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Toshihide Hatsui, Hitoshi Takeshita
1990 Volume 19 Issue 8 Pages
1253-1254
Published: 1990
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Photooxygenation of quadricyclane(
1) was shown to proceed via the electron transfer mechanism on the basis of the structure revision of a methoxy alcohol. Photoisomerization of
1 to norbornadiene occurred during the irradiation.
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Takeo Akiyama, Kosei Nakamura, Masami Tamada, Hirobumi Ushijima, Masat ...
1990 Volume 19 Issue 8 Pages
1255-1258
Published: 1990
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Bimetallic complexes, A–CH
2–B(
1) and A–(CH
2)
2–B(
2), were synthesized in which (η-cyclopentadienyl)(1,2-dicyano-1,2-ethylenedithiolato)cobalt(III) (A) and ferrocene (B) moieties are bound at the cyclopentadienyl(cp) rings by–CH
2–. Their cyclic voltammogramms show the presence of the intramolecular interaction between the two metal complex moieties, A and B. Moiety B (oxidized form) promotes decomposition of the oxidized form of A. The MS fragment patterns of
1 and
2 suggest the presence of a species in which two sulfur atoms of the dithiolene ligand bridge the two metal atoms.
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Teruaki Mukaiyama, Haruhiro Takenoshita, Masaaki Yamada, Tsunehiko Sog ...
1990 Volume 19 Issue 8 Pages
1259-1262
Published: 1990
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A result of the reaction between phenylthiotrimethylsilane and (
E)-chalcone dimethyl acetal let us to reinvestigate the structure of the isomerized products obtained from the reaction of acetals of (
E)-chalcone derivatives with trimethyl cyanide recently reported from our laboratory. It was found consequently that previously assigned isomerized products were not
Z-isomer of α-methoxy-β,γ-unsaturated nitriles, but γ-methoxy-α,β-unsaturated nitriles produced by double transfer of double bond and methoxy group. Reactions of thus formed nitriles with several silylated nucleophiles are also described.
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Seiji Shinkai, Koji Iwamoto, Koji Araki, Tsutomu Matsuda
1990 Volume 19 Issue 8 Pages
1263-1266
Published: 1990
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The solvent effects on the “cone”–“partial cone” equilibrium in tetramethoxy-
p-
t-butylcalix[4]arene were studied for the first time. It was found that the concentration of the “cone” isomer is increased with increasing solvent polarity. The shift in the equilibrium was accounted for by the differece in the dipole moment between “cone” and “partial cone” isomers.
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Victor W. Day, Walter G. Klemperer, Atsushi Yagasakl
1990 Volume 19 Issue 8 Pages
1267-1270
Published: 1990
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A 1,5-cyclooctadieneiridium complex of V
4O
124−, {[(η-C
8H
12)Ir]
2(V
4O
12)}
2− is synthesized as a tetra-
n-butylammonium salt by reacting [(η-C
8H
12)IrCl]
2 with either [(
n-C
4H
9)
4N]
3V
5O
14 or [(
n-C
4H
9)
4N]VO
3 in CH
3CN. The reaction of [(η-C
8H
12)IrCl]
2 with [(
n-C
4H
9)
4N]VO
3 in CH
3CN also yields [(η-C
8H
12)Ir(V
4O
12)]
3− as a tetra-
n-butylammonium salt. X-Ray structural analyses revealed that the [(η-C
8H
12)Ir(V
4O
12)]
3− and {[(η-C
8H
12)Ir]
2(V
4O
12)}
2− anions contain a V
4O
124− ring coordinated to one or two (η-C
8H
12)Ir
+ moieties, respectively.
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Koichi Narasaka, Hidehiro Sakurai, Takashi Kato, Nobuharu Iwasawa
1990 Volume 19 Issue 8 Pages
1271-1274
Published: 1990
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Bidentate Lewis acids, bis-arylboronates of 2,3,6,7-tetrahydro-1,1,5,5-tetramethylindacene-2
R*,3
R*,6
R*,7
R*-tetraol were synthesized from tetramethylindacene and were found to form complexes selectively with 4-aminopyridine derivatives.
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Shunichi Fukuzumi, Toshiaki Kitano
1990 Volume 19 Issue 8 Pages
1275-1278
Published: 1990
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Electron spin resonance (ESR) spectra of transient radical cations of 9,10-dihydro-10-methylacridine and derivatives, which are NADH analogues, are observed in electron transfer reactions from the NADH analogues to Fe
3+ or Cu
2+ in acetonitrile.
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Takehiko Mori, Hiroo Inokuchi, Aravinda M. Kini, Jack M. Williams
1990 Volume 19 Issue 8 Pages
1279-1282
Published: 1990
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Seven new electron donors, 4,5-ethylenedioxytetrathiafulvalenes where 4′,5′-substituents are trimethylenedithio, ethylenedithio, methylenedithio, 2-oxatrimethylenedithio, methylthio, hydrogen and methyl carboxylate, are prepared, and their electrochemical properties are investigated.
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Kenji Monde, Mitsuo Takasugi, Nobukatsu Katsui, Tadashi Masamune
1990 Volume 19 Issue 8 Pages
1283-1286
Published: 1990
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Lettucenin A, a novel composite phytoalexin with 2
H-cyclohepta[
b]furan-2-one ring system was synthesized from an indanone. The unique ring system was constructed by reductive ring expansion of a dibromomethylcyclohexadienone.
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Akio Fukuzawa, Mya Aye, Masao Nakamura, Mamoru Tamura, Akio Murai
1990 Volume 19 Issue 8 Pages
1287-1290
Published: 1990
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The first biosynthetic
in vitro evidence for marine natural bromo-ethers by using lactoperoxidase is reported.
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Katsumi Katakura, Atsushi Noma, Zempachi Ogumi, Zen-ichiro Takehara
1990 Volume 19 Issue 8 Pages
1291-1294
Published: 1990
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A new type amperometric oxygen sensor operating at room temperature is constructed using Nafion, porous platinum cathode directly deposited on Nafion, and a polyethylene film covering the cathode surface directly. An oxygen reduction current is limited by oxygen diffusion rate through the diffusion-limiting polyethylene film and it changes in proportion to oxygen concentration of gases up to 100%.
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Yujiro Hayashi, Koichi Narasaka
1990 Volume 19 Issue 8 Pages
1295-1298
Published: 1990
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Asymmetric [2+2] cycloaddition reaction between 3-(acryloyl)-1,3-oxazolidin-2-one derivatives and alkynyl or alkenyl sulfides proceeds by the use of a chiral titanium reagent to give the corresponding cyclobutene or cyclobutane derivatives in high enantioselectivity.
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Susumu Kurishima, Takashi Ito
1990 Volume 19 Issue 8 Pages
1299-1302
Published: 1990
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The photoreaction of [MoH
4(dppe)
2] with succinimide gave [MoH(succinimido-
N,
O)(dppe)
2], which was characterized spectroscopically as well as X-ray crystallographically to have the imido ligand coordinated to the metal bidentately
via nitrogen and oxygen atoms constructing four membered metallacycle.
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Hiroyuki Oshita, Yasushi Mizobe, Masanobu Hidai
1990 Volume 19 Issue 8 Pages
1303-1306
Published: 1990
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When treated with a mixture of ClMe
2SiCH
2CH
2SiMe
2Cl and excess NaI,
cis-[W(N
2)
2(PMe
2Ph)
4] (
1) afforded
, the structure of which was determined by the X-ray analysis. On the other hand, treatment of
1 with Me
3GeCl in the presence of excess Nal gave two germylated dinitrogen complexes
trans-[WI(NNGeMe
3)(PMe
2Ph)
4] and
mer-[WI
2(NNHGeMe
3)(PMe
2Ph)
3].
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Osamu Kitagawa, Akihiro Hashimoto, Yoshiro Kobayashi, Takeo Taguchi
1990 Volume 19 Issue 8 Pages
1307-1310
Published: 1990
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2,2-Difluoroketene silyl acetal, generated
in situ by treating methyl difluoroiodoacetate with Zn followed by chlorosilane, readily reacted with α,β-unsaturated carbonyl compounds or acetals to give the 1,4-addition products, preferentially. The difluoro analogs of glutamic acid and lysine were prepared through the present reaction.
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Kazunari Yoshizawa, Kazuyoshi Tanaka, Tokio Yamabe
1990 Volume 19 Issue 8 Pages
1311-1314
Published: 1990
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A reddish-orange colored polymer was synthesized by catalytic dehydrohalogenation of
m-chloroaniline. The polymer was confirmed to have a poly(
m-aniline) structure which will be of our interest as a basic skeleton for ferromagnetic polymer.
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Takenori Kusumi, Kengo Yamada, Midori O. Ishitsuka, Yoshiharu Fujita, ...
1990 Volume 19 Issue 8 Pages
1315-1318
Published: 1990
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Three new cembranoids, (+)-isosarcophine (
1), (+)-8-hydroxyisosarcophytoxide-6-ene, and (+)-methyl cembra-1,3,7,11-tetraene-16-carboxylate have been isolated from
Sinularia mayi, and their structures including the absolute configuration of
1 have been determined spectroscopically and by means of chemical reaction.
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Takefumi Momose, Naoki Toyooka, Yoshiro Hirai
1990 Volume 19 Issue 8 Pages
1319-1322
Published: 1990
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An asymmetric cleavage of the ‘fork head’ ketone of 9-azabicyclo[3.3.1]nonan-3-one gave a
cis-2,6-disubstituted piperidine derivative in 93% ee, which was transformed to the
cis-2,6-bis(hydroxymethyl)piperidine derivative, a versatile chiral building block.
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Hiroyuki Tani, Tokuo Inamasu, Rui Tamura, Hitomi Suzuki
1990 Volume 19 Issue 8 Pages
1323-1326
Published: 1990
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On treatment with tellurium tetrachloride in dichloromethane at room temperature, 1,3-dithiolanes and 1,3-oxathiolanes undergo smooth ring expansion to give dihydro-1,4-dithiin and dihydro-1,4-oxathiin derivatives respectively in good to moderate yields.
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Koji Yamada, Shuji Tobashi, Sumio Ichiba
1990 Volume 19 Issue 8 Pages
1327-1330
Published: 1990
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The topotactic oxidation process from magnetite to maghemite was investigated, using tin substituted magnetite by means of the Rietveld analysis of the powder X-ray diffraction and the
119Sn Mössbauer spectroscopy.
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Hanhein Wang, Tadayoshi Sakata, Masashi Azuma, Tetsuo Ohta, Hidemasa T ...
1990 Volume 19 Issue 8 Pages
1331-1334
Published: 1990
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Photocatalytic asymmetric reduction of 3-methyl-2-oxobutanoic acid giving 2-hydroxy-3-methylbutanoic acid has been carried out in up to 60% ee in aqueous methanol with chiral BINAP–Rh(I) complexes and semiconductor photocatalysts, TiO
2 or CdS.
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Shigeyuki Uemiya, Takeshi Matsuda, Eiichi Kikuchi
1990 Volume 19 Issue 8 Pages
1335-1338
Published: 1990
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A palladium membrane reactor was successfully applied to aromatization of propane. Conversion of propane to aromatics was apparently enhanced by use of a membrane reactor because hydrocrackingf dealkylation, and hydrogen transfer were suppressed as a result of the rapid separation of produced hydrogen.
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Yasuhiro Masaki, Yoshikazu Uehara, Shozo Yanagida, Chyongjin Pac
1990 Volume 19 Issue 8 Pages
1339-1342
Published: 1990
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The isomerization of Hexamethyl(Dewar benzene) to hexamethylbenzene is photosensitized by 1,4-dicyanonaphthalenearene exciplexes. Spectroscopic and quantum-yield studies suggest that the isomerization proceeds mostly through an adiabatic pathway from hypothetical termolecular excited complexes (triplexes).
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Masahiro Hiramoto, Kazuhito Hashimoto, Tadayoshi Sakata
1990 Volume 19 Issue 8 Pages
1343-1346
Published: 1990
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An ultramicrostructured photoelectrode system composed of a TiO
2 single crystal and thin films of SiO
2 and Pt was prepared by exposing the vertical section of the layered SiO
2 and Pt film. The distance between the semiconductor and metal, i.e., the thickness of the SiO
2 layer is made very thin (ca.140 nm). This electrode showed photoresponse under irradiation in the presence of vapor of water, ammonia, ethanol and acetone. This is the first micro-photoelectrode system which can work in the gas phase.
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Yoshiyasu Ichikawa
1990 Volume 19 Issue 8 Pages
1347-1350
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Two routes for the synthesis of aminobisabolenes were developed. One is the divergent course which completes the first synthesis of the target molecules. Another synthetic route is the biomimetic approach based on the hypothesis of biosynthesis.
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Jun-ichiro Setsune, Yoshihiro Ishimaru, Teijiro Kitao
1990 Volume 19 Issue 8 Pages
1351-1354
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N
21,N
22-(1,2-Diphenyletheno)-
meso-tetraphenylporphin hydroperchlorate was reduced by NaBH
4 to the 5
H-phlorin and deprotonated by NaOH to the free base. However, the N
21,N
22-hydroxymethyletheno derivative underwent intramolecular attack of the bridge hydroxy group on the 10-meso position to give the novel 10
H-phlorin under basic conditions.
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Shin-ichi Kugimiya, Motoko Takemura
1990 Volume 19 Issue 8 Pages
1355-1358
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Optical properties of terakis(p-n-decyloxyphenyl)porphyirn and its metal complexes (Co
II, Zn
II, Cu
II, and Mn
IIICl) have been investigated in the casting film (stacking state). Type of stacking of the titled porphyrins in the film has been controlled by changing the number of the porphyrin molecules used for the film preparation.
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Tadashi Hanaya, Takeshi Ohmae, Heizan Kawamoto, Hiroshi Yamamoto
1990 Volume 19 Issue 8 Pages
1359-1360
Published: 1990
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Starting from 1,2:5,6-di-
O-isopropylidene-β-D-altrofuranose, 5,6-dideoxy-1,2-
O-isopropylidene-5-[(methoxy)phenylphosphiny1]-3-
O-methyl-β-D-arabino-hexofuranose was prepared in a 6 step sequence (13% overall yield). It was converted into the title compounds, which were characterized as the 1,2,4-triacetates.
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Masami Sawada, Li Ouyang, Yoshio Takai, Hitoshi Yamada, Terukiyo Hanaf ...
1990 Volume 19 Issue 8 Pages
1361-1364
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Relative FABMS peak-intensities of the cluster ions between a set of permethylated aldopyranoses and potassium ion provide a lose relation with relative FABMS/MS area-intensities of the corresponding cluster ions between a set of methyl aldopyranosides and potassium ion.
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Keiji Iriyama, Toshinari Araki, Takashi Iwasaki
1990 Volume 19 Issue 8 Pages
1365-1368
Published: 1990
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An evidence for the thermally induced phase separation in a mixed monolayer on an aqueous subphase was electron microscopically visualized.
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Naoki Toshima, Jun-ichi Tayanagi
1990 Volume 19 Issue 8 Pages
1369-1372
Published: 1990
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Pyrrole can be easily polymerized to produce polypyrrole by using an AlCl
3–CuCl–O
2 cayalytic system. The yield of polypyrrole was very high and more than 600% based on the amount of CuCl used. The conductivity of the pressed polypyrrole was 10
−2 S cm
−1.
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Gaku Yamamoto
1990 Volume 19 Issue 8 Pages
1373-1376
Published: 1990
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Two rotamers,
ap and
sc1, of the title compound were separately isolated as stable entities at room temperature. The rotamers gave an equilibrium mixture of the two at elevated temperatures, K([
ap]/[
sc1]) being 2.26 at 60 °C in toluene-
d8. The kinetic parameters for the
sc1 →
ap conversion are as follows: ΔH
‡ = 26.3 ± 0.6 kcal mol
−1 (1 cal = 4.184 J), ΔS
‡ = −2.7 ± 1.8 cal mol
−1 K
−1, ΔG
‡350K = 27.2 kcal mol
−1.
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Tamio Hayashi, Sunantha Hengrasmee, Yonetatsu Matsumoto
1990 Volume 19 Issue 8 Pages
1377-1380
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Hydrosilylation of 1-vinylcycloalkenes with methyldichlorosilane in the presence of a palladium catalyst proceeded with high regio- and stereoselectivity to give (
Z)-1-ethylidene-2-silylcycloalkanes in high yields.
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Koji Kano, Masayuki Takeuchi, Shizunobu Hashimoto, Zen-ichi Yoshidat
1990 Volume 19 Issue 8 Pages
1381-1384
Published: 1990
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Hemin promotes the Markovnikov-type addition reactions of thiols (origins of the thiols are their disulfide derivatives) to styrene in benzene–ethanol (1:1) containing NaBH
4. The plausible reaction mechanism has been discussed.
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Kitao Fujiwara, Toshiyuki Kashima, Hiroyuki Tsubota, Yoshinori Toyoshi ...
1990 Volume 19 Issue 8 Pages
1385-1386
Published: 1990
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The temporal change in absorbance of the solution was observed after mixing permanganate and oxalic acid. The oscillating structure appeared continuing more than 1 h. This oscillation was not observed by mixing permanganate with the reducing agents other than oxalic acid such as Ce
3+ and As
3+.
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Takahiro Hosokawa, Fumio Nakajima, Shooji Iwasa, Shun-Ichi Murahashi
1990 Volume 19 Issue 8 Pages
1387-1390
Published: 1990
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Pd(II)-Catalyzed cyclization of methyl (2
S,3
S)-2-allyl-3-hydoxybutyrate with methanol gives (2
R,4
S,5
S)-2,5-dimethyl-2-methoxy-4-methoxycarbonyltetrahydrofuran in 88% de. The cyclization of (2
R,3
S)-2-allyl-1,3-butanediol gives homochiral bicyclic acetal
3 (R
1 = Me).
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Hiroshi Watanabe, Hiroaki Utsuyama, Shinji Sahara
1990 Volume 19 Issue 8 Pages
1391-1394
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The chloro complex of ruthenium(III) with TOMAC, and its thermal decomposition behavior have been investigated. The complex exists in a polymeric chloro complex bridged with hydroxyl groups. Further, the thermal decomposition process of the complex was proposed.
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Koji Kato, Teruaki Mukaiyama
1990 Volume 19 Issue 8 Pages
1395-1398
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In the presence of a catalytic amount of
N,
N′-bis(2-ethoxycarbonyl-3-oxobutylidene)ethylenediaminatocobalt(II), various α,β-unsaturated carboxamides are converted to the corresponding 2-nitrosocarboxamides regioselectively in good yields on treatment with nitric oxide and triethylsilane at room temperature.
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Yoshiyuki Ando, Hiroshi Nishihara, Kunitsugu Aramaki
1990 Volume 19 Issue 8 Pages
1399-1402
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Two-step electropolymerization involving reduction of Fe(C
5H
4CH
2Cl)
2 catalyzed by a poly[Co(C
5CH
4Cl=CHCHO)
2]
+/0 electrode film affords a cobaltocenium/ferrocene bilayer-like film. A device fabricated by sandwiching this film between electrodes shows diode-like i-V characteristics under a dry nitrogen atmosphere.
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Kazuaki Shimada, Shigeki Hikage, Yoshiyuki Takeishi, Yuji Takikawa
1990 Volume 19 Issue 8 Pages
1403-1406
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Reaction of nitriles with (Me
3Si)
2 Se in the presence of BF
3·OEt
2 afforded the corresponding primary selenoamides in moderate yields. A selenourea and a selenothiocarbamate were also prepared in a similar manner from the corresponding cyanamide and thiocyanate.
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Masako Nakagawa, Jun Yoshida, Tohru Hino
1990 Volume 19 Issue 8 Pages
1407-1410
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The first total synthesis of symbioramide (
1) is described and simultaneously established the complete stereostructure of
1 to be (2S,3R,2′R,3′E)-
N-(2′-hydroxy-3′-octadecenoyl)-dihydrosphingosine.
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Koichi Narasaka, Nobuo Saito, Yujiro Hayashi, Hikaru Ichida
1990 Volume 19 Issue 8 Pages
1411-1414
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The tide compound was prepared from bis(methylthio)methane as a crystalline compound. The molecular structure was determined by X-ray crystallographic analysis, and reactions with alkyl metals and a Wittig reagent were examined.
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Shinichiro Takigawa, Shuzo Shinke, Masato Tanaka
1990 Volume 19 Issue 8 Pages
1415-1418
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Cobalt carbonyl-catalyzed carbonylation of methylvinylphosphinate with acetamide followed by hydrolysis gave 2-amino-4-[hydroxy(methyl)phosphinyl]butanoic acid (glufosinate) in more than 80% overall yield.
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Minoru Tanaka, Hideya Mizufune, Toshiyuki Shono
1990 Volume 19 Issue 8 Pages
1419-1422
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The complex formation of malonate-type bis(12-crown-4)s with sodium picrate was studied by
23Na NMR. The dependence of the
23Na NMR signals on the molar ratio [bis(12-crown-4)]/[Na
+] is quite different from that on a molar ratio [monocyclic 12-crown-4]/[Na
+], indicating the stable sandwich-type complex formation for the bis(12-crown-4)s.
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Tohru Tsuchiya, Masahiko Yasumoto, Isao Shibuya, Yoichi Taguchi, Katsu ...
1990 Volume 19 Issue 8 Pages
1423-1426
Published: 1990
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At 800 MPa, 100 °C carbon disulfide, dialkylcyanamide and benzylideneaniline afford 2-dialkylthiocarbamoylimino-3,4-diphenyl-1,3-thiazetidine, the structure of which was determined by X-ray crystallography.
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Ken Takaki, Shinji Tanaka, Fumikazu Beppu, Yuichiro Tsubaki, Yuzo Fuji ...
1990 Volume 19 Issue 8 Pages
1427-1430
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The reaction of diaryl ketones such as benzophenone with chiral epoxides in the presence of Yb metal at room temperature has been found to give chiral 1,3-diols in high optical yields.
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Daishiro Ikeda, Keiichi Ajito, Shinichi Kondo, Tomio Takeuchi
1990 Volume 19 Issue 8 Pages
1431-1432
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Barminomycin I and II, an extremely potent antitumor anthracyclines, have a unique eight-membered azomethine or carbinolamine structure. (1″
R,5″
R)-3″-Dehydro-4-
O-methylbarminomycin II was first synthesized through the hypothetical biogenetic intermediate.
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Keisuke Umeda, Asao Nakamura, Fujio Toda
1990 Volume 19 Issue 8 Pages
1433-1436
Published: 1990
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In the reaction system with AOH
+ as a photosensitizer, the generation of NADH stopped after 20 min irradiation at low level. On the other hand, when a photosensitizer was Chla, non-stop generation of NADH was observed after 80 min irradiation. This is because NADH generated was consumed by a side reaction in AOH
+-reaction system, whereas it does not occur in Chla-reaction system.
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