-
Abdol Reza Hajipour, Shadpour E. Mallakpour, Gholamhasan Imanzadeh
1999 Volume 28 Issue 2 Pages
99-100
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A manupulatively simple and rapid method for oxidation of alcohols to the corresponding carbonyl compounds is described. The reaction is conduced under solventless ‘dry’ conditions using alumina-supported permanganate.
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Kazuteru Shinozaki, Yasutake Hotta, Takuhiro Otsuka, Youkoh Kaizu
1999 Volume 28 Issue 2 Pages
101-102
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In the crystal composed of Δ-[Ru(bpy)
3]
2+ and Λ-[Os(bpy)
3]
2+ complexes which were pseudo enantiomers the photo-excitation energy was effectively transferred from [Ru(bpy)
3]
2+ to [Os(pby)
3]
2+ (
kET > 1.1 × 10
8 s
−1). In rac-[Os(bpy)
3](PF
6)
2 crystal the energy-transfer rates from Λ-[Os(bpy)
3]
2+ to Λ-[Os(bpy)
3]
2+ and from Λ-[Os(bpy)
3]
2+ to Δ-[Os(bpy)
3]
2+ were estimated as
k⊥ = 1.8 × 10
6 s
−1 and
k// = 7.9 × 10
5 s
−1, respectively.
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Yasuo Yamamoto, Kiyoshi Tanabe, Tsuneo Okonogi
1999 Volume 28 Issue 2 Pages
103-104
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N-Aryl-
N′-benzyl piperazine derivatives were synthesized using REM resin. In cleavage step, the piperazine derivatives were successfully prepared in a good yield and excellent purity by treatment with novel polymer supported base in the absence of any base.
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Toshiaki Murai, Chiyoko Izumi, Shinzi Kato
1999 Volume 28 Issue 2 Pages
105-106
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The reaction of selenothioic acid
S-esters with trialkyl phosphites proceeded smoothly to afford
α-phosphoryl sulfides as a major product in good to high yields. The reaction was also applicable to diselenoic acid esters. On the contrary, selenothioic acid
S-butyl ester underwent oxidative dimerization with triphenylphosphine to give a divinyl diselenide.
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Takayuki Arai, Motohiro Akazome, Katsuyuki Ogura
1999 Volume 28 Issue 2 Pages
107-108
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In order to synthesize highly branched-alkyl aryl ketones, l-(methylthio)-1-alken-2-yl phenyl ketones were subjected to the reaction with lithium dialkylcuprate. The high reactivity of an intermediary enolate toward molecular oxygen was found to give
α-hydroperoxy ketones.
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Dusan Hesek, Yoshihisa Inoue, Simon R. L. Everitt
1999 Volume 28 Issue 2 Pages
109-110
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The preparation of ruthenium bis(bipyridine) sulfoxides has been carried out under thermal or photochemical conditions, leading to good yields of products with
trans or
cis configurations, and the configuration of the starting material has also been observed to influence the preferred structure of the final product.
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Toshikazu Takata, Hiroaki Kawasaki, Satoko Asai, Nobuhiro Kihara, Yosh ...
1999 Volume 28 Issue 2 Pages
111-112
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Side chain polyrotaxanes were synthesized from radically polymerizable pseudorotaxane monomers (DB24C8·
1) which were composed of secondary ammonium salts having (meth)acryl group at one end and bulky stopper at the other end (
1a and
1b) and dibenzo-24-crown-8 (DB24C8). Both radical polymerization of DB24C8·
1 and copolymerization of DB24C8·
1a with styrene afforded corresponding polymers having rotaxane moieties in the side chains (
2a,
2b, and
3).
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Yasuo Kubo, Kouhei Kusumoto, Satoshi Nakajima, Isamu Inamura
1999 Volume 28 Issue 2 Pages
113-114
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In the photoreactions of 9,10-dicyanophenanthrene (
6) with 1,3-butadiene (
7) a novel [3+2]-photocycloaddition at the 9,10-position of the phenanthrene ring of
6 to one of the double bond of
7 and a [2+2]-cycloaddition at the 9,10-position of
6 were found to proceed from the singlet and the triplet excited states of
6, respectively.
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Kazuhiko Ichikawa, M. Khabir Uddin, Kou Nakata
1999 Volume 28 Issue 2 Pages
115-116
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Zinc complexes of histidine-containing peptide derived from
N,N′-dihistidylethylenediamine
L1 and im-bzl-
N,N″-dihistidyldiethylenetriamine
L2 were designed and examined as catalysts for hydrolyses of bis(p-nitrophenyl)phosphate (BNPP) and p-nitrophenyl phosphate (NPP). The zinc complex of
L1 was inactive and another
L2 complex hydrolyzed efficiently BNPP and NPP: their pseudo-first-order rate constants are 1.1 × 10
−5 s
−1 and 2.1 × 10
−5 s
−1, respectively.
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Takamitsu Kanoh, Tetsuya Shichi, Katsuhiko Takagi
1999 Volume 28 Issue 2 Pages
117-118
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The self-assembly of sodium stearate and its homologs ( >C
12) in hydrotalcite (LDH) interlayers was found to change reversibly between mono- and bilayer structures with a ratio changing continuously within a range of 70 °C and 5 °C in stoichiometric intercalations in aqueous dispersion. The bilayer structure was more stable than the monolayer, judging from the fact that bilayer aggregations were formed even in high temperatures with the addition of excess amounts of guest stearates over the anion exchange capacity (AEC). Hydrophobic interaction was determined to be the key factor for the formation of a bilayer assembly.
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Hideki Kobayashi, Keiji Ueno, Hiroshi Ogino
1999 Volume 28 Issue 2 Pages
119-120
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Heating a toluene solution of CpFe(CO)
2SiR
3 (R
3 = HMe
2, HEt
2, and FMe
2) and excess P(OR′)
3 (R′ = Me, Et, and Me-
d3) at 80 °C resulted in the formation of an acyliron complex CpFe(CO){P(OR′)
3}COR′ in 25–40% yield: Hence the alkyl group of phosphite is transferred to the carbon of a carbonyl ligand to give an acyl ligand during the reaction.
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Kenji Tamura, Hitoshi Setsuda, Masahiro Taniguchi, Takayoshi Nakamura, ...
1999 Volume 28 Issue 2 Pages
121-122
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A clay-metal complex hybrid film with the thickness of 5.0 ± 1.0 nm was prepared by the Langmuir-Blodgett technique. According to the method, a hectorite clay dispersed in an aqueous subphase was adsorbed by a cationic monolayer of amphiphilic Ru(II) complex. The surface structure of a film deposited onto a hydrophilic glass plate was studied with an atomic force microscope (AFM).
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Sensuke Ogoshi, Ken Tsutsumi, Tsutomu Shinagawa, Kiyomi Kakiuchi, Hide ...
1999 Volume 28 Issue 2 Pages
123-124
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μ-η
3-Vinyl(phenyl)carbenedipalladium complex reacted with tetraphenyltin to give a η
3-diphenylallylpalladium complex through reductive elimination, and with internal alkynes to give μ-η
2:η
3-dienylcarbene complexes through migratory insertion.
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Kunio Kawamura
1999 Volume 28 Issue 2 Pages
125-126
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Monitoring of hydrothermal reactions in the time range of 3 - 1000 ms was succeeded by flow reactor using fused-silica capillary tubing. The technique was applied for measuring the hydrolysis rate of ATP at 250 °C in which the minimum monitoring time was 3.1 ms. The rate constants of ATP hydrolysis was consistent with that was extrapolated of the Arrhenius plots in our previous study. This method enables milli-second monitoring of hydrothermal reactions.
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Masato Ushiyama, Fumio Arisaka, Takeshi Yamamura
1999 Volume 28 Issue 2 Pages
127-128
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Multiple porphyrin systems were constructed using a Zn(II) porphyrin,
A, which is a
de novo designed peptide porphyrin, and Fe(III) protoporphyrin IX chloride,
B.
A forms a dimer in buffer solution containing 2,2,2-trifluoroethanol. However,
A forms a trimer by incorporating three equivalents of
B per
A. The results suggest that the
A/
B solution achieves a 12-porphyrin system consisting of different kinds of metalloporphyrins.
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Norihiro Tokitoh, Ibrahim El-Tantawy El-Sayed, Renji Okazaki
1999 Volume 28 Issue 2 Pages
129-130
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Oxidation of extremely overcrowded 1,2-thiagermacyclohex-4-ene derivatives with
m-chloroperbenzoic acid resulted in competitive formation of the ring expanded 1,2,7-oxathiagermacyclohept-4-ene derivatives and the ring contracted 1,2,3-oxathiagermacyclopentane derivatives. The latter reaction products are found to isomerize into the former ones very slowly at room temperature not only in solution but also in the crystalline state.
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Mojie Cheng, Zhengbao Wang, Keiji Sakurai, Fumio Kumata, Takeshi Saito ...
1999 Volume 28 Issue 2 Pages
131-132
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The new mesoporous silica with large pore size, SBA-15, was aluminated through the reaction with aluminum chloride. The present alumination method showed a good control of aluminum content but little influence on the pore structure. Aluminum atoms were incorporated into the framework of SBA-15, which resulted in a new kind of mesoporous acid catalyst.
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Hisashi Tanaka, Akiko Kobayashi, Hayao Kobayashi
1999 Volume 28 Issue 2 Pages
133-134
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The resistivity and the magnetic susceptibility of BETS conductor with modified
λ-type structure,
λ′-(BETS)
2GaBr
4 are 0.06 Ω cm and 4 × 10
−4 emu mol
−1 at room temperature. In contrast to the semimetal-to-insulator transition at ambient pressure, the system showed an unusual high-pressure resistivity behavior below 50 K. Very sensitive pressure dependence of the resistivities will be consistent with the semirnetallic Fermi surface obtained by extended Hückel tight-binding band calculation.
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Yasuko Nishida, Akihiro Yatani, Yasuo Nakao, Jyun-ichiro Taka, Setsuo ...
1999 Volume 28 Issue 2 Pages
135-136
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The first hydrogencarbonato-bridged dinuclear copper(II) complex [Cu
2(L)(HCO
3)](BF
4)
2·5H
2O,
1 was obtained by allowing of acetone solution containing a copper(II) complex [Cu
2(L)(OH)](BF
4)
2·6H
2O, where HL is
N,
N,
N′,
N′-tetrakis[(1-methyl-2-benzimidazolyl)methyl]-2-hydroxy-1,3-diaminopropane. The crystal structure of
1 was determined by X-ray crystallography and characterized by the magnetic susceptibility and infrared and visible absorption spectrum.
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Masatoshi Kanesato, Toshiro Yokoyama
1999 Volume 28 Issue 2 Pages
137-138
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The preparation and characterization of Ln(III) complexes (Ln = Eu, Gd, Tb, Er, Tm, Lu) of heptadentate (N
4O
3) ligand trensal, tris[2-(salicylideneamino)ethyl]amine (H
3L
1), have been studied. The molecular structures of [LnL
1] were determined by X-ray structural analysis ; these are heptadentate complexes in which the metal ions are coordinated by the three oxygen atoms and the four nitrogen atoms.
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Morifumi Fujita, Masaki Ohshiba, Yayoi Yamasaki, Takashi Sugimura, Aki ...
1999 Volume 28 Issue 2 Pages
139-140
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The presence of a zwitterionic intermediate during the oxygenation of electron-rich naphthalenes with singlet oxygen is clarified by the clean and efficient formation of hydroperoxide
via nucleophilic addition of the intramolecular alcohol to the intermediate and by its stereochemical analysis using an optically active linker of the alcohol.
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Go Hirai, Hiroki Oguri, Masahiro Hirama
1999 Volume 28 Issue 2 Pages
141-142
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Stereo-controlled construction of the C-ring model (
4) of zoanthamine alkaloids was achieved via a SmI
2-mediated Simmons-Smith reaction.
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Jae Hong Kim, Masaru Matsuoka, Koushi Fukunishi
1999 Volume 28 Issue 2 Pages
143-144
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Topochemical photocycloaddition of morphologically isomeric yellow and orange crystals of bis(2-phenylethenyl)dicyanopyrazine
1 were conducted in solution, in the vapor deposited thin film and in the single crystals. Photoreaction of the yellow crystal gave syn head-to-tail dimer and its polymer, but the orange crystal did not react at all. The selective topochemical photocycloaddition of
1 was discussed based upon the lattice contraction and the dynamic movement of the molecular packing arrangements.
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Toshinori Sate, Fuyuka Ohtake, Yutaka Ohira, Yoshio Okahata
1999 Volume 28 Issue 2 Pages
145-146
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A sialidase inhibitor, 2,7-dideoxy-7-fluoro-2,3-didehydrosialic acid was found to effectively inhibit the binding of influenza virus H1 hemagglutinin to ganglioside GM3.
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Tomoyuki Inoue, Shrestha Niranjan Kumar, Toshiaki Kamachi, Ichiro Okur ...
1999 Volume 28 Issue 2 Pages
147-148
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Hydrogen production system from glucose consisting of glucose dehydrogenase from
Bacillus sp. and hydrogenase from
Alcaligenes eutrophus H16 was established. When the solution containing glucose, glucose dehydrogenase, NAD, and hydrogenase was incubated at 30 °C, hydrogen evolution was observed.
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Kunio Hiroi, Yoshio Suzuki, Ikuko Abe
1999 Volume 28 Issue 2 Pages
149-150
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The synthesis of (
S)-proline-derived phosphines bearing organosulfur groups and the use of them as chiral ligands in palladium-catalyzed asymmetric allylic alkylations were accomplished successfully. The mechanism is discussed on the basis of the stereochemical results, presumably by participation of organosulfur groups as alternative enantiocontrollable coordinating elements.
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Tohru Saitoh, Satoko Ohkubo, Chiyo Matsubara
1999 Volume 28 Issue 2 Pages
151-152
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Negatively charged copper(II) and zinc(II) chelates with 5,10,15,20-tetrakis(4-carboxyphenyl)-21
H,23
H-porphine were incorporated into the precipitates formed from the aqueous solutions of thermo-responsive polymer; poly(
N-isopropylacrylamide). In the presence of an appropriate kind and amount of quaternary ammonium ion, the recovery of the chelate was quantitatively. Sub-ppt level zinc(II) in water by the photometric detection in HPLC was successfully achieved, because of the highly efficient concentration.
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G. Ilangovan, J.-M. Zen
1999 Volume 28 Issue 2 Pages
153-154
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The electrocatalytic oxidation of guanine by nontronite-bound electroinactive Fe(bpy)
32+ has been identified with a catalytic rate constant of 5.84 × 10
4 M s
−1.
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Katsuhiko Nishiyama, Ryu Yamashita, Makoto Ishida, Isao Taniguchi
1999 Volume 28 Issue 2 Pages
155-156
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Chlorella ferredoxin is thermostable for several hours at 50 °C. However, in the presence of 9,10-phenanthrorine or 2,2′-bipyridine, the oxidized [2Fe-2S] cluster of ferredoxin undergoes spontaneous reduction to the reduced state without adding other reducing agents.
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Yasumasa Fukushima
1999 Volume 28 Issue 2 Pages
157-158
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The conformation of poly(Glu-Leu-Lys-Leu) was converted a β-sheet to an α-helix by addition of alcohols. The polypeptide has two HFIP-induced conformational transitional points. The non-hydrogen bonded interactions, the hydrophobicity of the peptide surface, and the secondary structural propensities of the constituent amino acids would play a major role in the conformational transitions and secondary structural stability.
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Paul Nombel, Yasuo Hatanaka, Shigeru Shimada, Masato Tanaka
1999 Volume 28 Issue 2 Pages
159-160
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Dehydrogenative coupling reactions of bis(hydrosilyl)benzenes with [Ru
3(CO)
12] afford moderate yields of the polymers [-SiRR′-Ru(CO)
4-Ru(CO)
4-SiRR′-C
6H
4-]
n which exhibit large solvent-dependent change of the UV-VIS spectra. The absorption maximum of the polymer is markedly red-shifted, compared with monomeric complex [PhMe
2SiRu(CO)
4Ru(CO)
4SiMe
2Ph].
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Yong-Jin Pu, Masahiro Takahashi, Eishun Tsuchida, Hiroyuki Nishide
1999 Volume 28 Issue 2 Pages
161-162
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A ground state quartet molecule, 2,8,14-trisoxyphenyltribenzotrisdehydro[12]annulene, was synthesized; the dehydroannulene acted as an effective ferromagnetic coupler for the pendant spins.
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Li Xu, Yoichi Sasaki, Masaaki Abe
1999 Volume 28 Issue 2 Pages
163-164
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The Mo(0) and Mo(VI) complexes of tris(2-pyridylmethyl)amine (tpa), Mo(CO)
3(tpa) and Mo(O)
3(tpa)•H
2O, were synthesized. Structural analyses revealed tridentate coordination of tpa in both compounds. The fluxional behavior of both species was investigated by variable-temperature
1H NMR spectroscopy.
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Shigeaki Abe, Yoshinobu Nishimura, Iwao Yamazaki, Nobuhiro Ohta
1999 Volume 28 Issue 2 Pages
165-166
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Electroabsorption spectra of merocyanine (PMC) produced by an photochromic reaction of spiropyran (SP) in a PMMA polymer film have been measured. The intensity of the sharp absorption band assigned as an aggregate of PMC was found to be remarkably reduced by an external electric field. The photochromic reaction from the aggregate of PMC to SP is suggested to be markedly enhanced by an electric field.
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Tetsuji Moriguchi, Kazunori Sakata, Akihiko Tsuge
1999 Volume 28 Issue 2 Pages
167-168
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Conformational properties and intramolecular hydrogen-bondings of dithia[3.3]metacyclophanes carrying one or two amino group on their internal positions were studied by
1H-NMR, IR spectra and X-ray structural analyses. It was found out that intramolecular hydrogen-bonding network between amino protons and bridge sulfur atoms is formed and it is closely related to the conformations of cyclophanes.
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Olivier Devos, Ryoichi Aogaki
1999 Volume 28 Issue 2 Pages
169-170
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A new dynamic phenomenon in high magnetic field,
i.e., an expanding liquid ring formation according to parabolic distribution of magnetic field, was discussed. Then, a new experimental technique by using this phenomenon was developed in order to observe and quantify such motion of paramagnetic or diamagnetic liquid.
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K. Mani Bushan, E. Temidayo Ayodele, V. Raj Gopal, T. Soujanya, V. Jay ...
1999 Volume 28 Issue 2 Pages
171-172
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One-way
cis to
trans photoisomerization is achieved in styrylnaphthalene derivative (
3) by suppressing the
trans to
cis isomerization with the use of suitable substituents and solvents.
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Yutaka Saito, Masaki Mifune, Kenichiro Hayashi, Akimasa Iwado, Midori ...
1999 Volume 28 Issue 2 Pages
173-174
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Resonance Raman spectra of Ni(II)-tetrakis(4-methylpyridyl)porphine (Ni-TMPyP) were measured in the presence of Cu(II)- or Ni(II)-phthalocyanine tetrasulfonate or silica gels immobilized with Cu(II)- or Ni(II)-phthalocyanine derivative. The interaction between Ni-TMPyP and metal-phthalocyanines caused apparent changes of the resonance Raman spectra of Ni-TMPyP in water.
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Yasuo Kubo, Nobuhiro Fuseya, Satoshi Nakajima
1999 Volume 28 Issue 2 Pages
175-176
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Novel [3+3]-additions and water (methanol)-incorporated additions were observed in the photoreactions of
N-methyl-1,8-naphthalimide with methylbenzenes, such as xylenes, mesitylene, and durene, in acetonitrile. A mechanism for the reactions is proposed on the basis of the fluorescence quenching examinations, calculations of
ΔG associated with the electron transfer, and deuteration studies.
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Taki Matsumoto, Yasushi Murakami, Yoshio Takasu
1999 Volume 28 Issue 2 Pages
177-178
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UV-absorbed transparent monolithic titanium oxide gels were prepared by the catalytic sol-gel process with 1,10-phenanthroline hydrochloride and n-butylamine. When 1,10-phenanthroline was added to the precursor solution, transmittance of the gels increased. The higher the content of 1,10-phenanthroline hydrochloride and the lower content of water, the more transparent gel was formed. The transparent titanium oxide gels were obtained by reducing hydrolysis and promoting polycondensation.
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Takashi Sugimura, Shinya Nagano, Harumi Kohno, Morifumi Fujita, Akira ...
1999 Volume 28 Issue 2 Pages
179-180
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The Diels-Alder reaction of tetracyanoethylene (TCNE) with a 1-trienol unit in the tropilidenes at the 1,4-position was a quick and reversible process, whereas the 3,6-addition only proceeded in polar solvent and was irreversible.
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Toru Obata, Tetsuro Shimo, Shigeyoshi Yoshimoto, Kenichi Somekawa, Mas ...
1999 Volume 28 Issue 2 Pages
181-182
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Photoirradiation of a 1:1 complex crystal of 4-methoxy-6-methyl-2-pyrone (
1) with maleimide (
2) peri-, site- and stereospecifically gave 11-methoxy-7-methyl-4-aza-8-oxatricyclo[5.4.0.0
2,6]undec-10-en-3,5,9-trione (
3) (
endo-[2+2]adduct), which was different from the solution products. It was inferred to be effectively brought by two sets of the hydrogen bonding and CT stacking between
1 and
2.
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Yutaka Amao, Keisuke Asai, Ichiro Okura
1999 Volume 28 Issue 2 Pages
183-184
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A novel optical oxygen sensor based on the quenching of triplet-triplet absorption of C
70 molecule by oxygen has been developed using time-resolved spectroscopy. The photoexcited triplet state of C
70 was quenched effectively by oxygen and large Stern-Volmer constant was obtained.
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Akira Ikuo, Kenichiro Otani, Tamiko Chijimatsu, Jun Uzawa, Katsutosi Y ...
1999 Volume 28 Issue 2 Pages
185-186
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Photochemical isomerization of
trans-dichlorotetrakis(dimethylphenylphosphine)osmium(II) to its
cis-form was confirmed by NMR and IR spectroscopy. The quantum yield of isomerization was 0.9 at 410 nm which was much larger than that (0.03 at 410 nm) of
trans-dichlorobis(diphenylphosphinoethane)osmium(II).
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Juzo Nakayama, Taku Kitahara, Yoshiaki Sugihara, Akihiko Ishii
1999 Volume 28 Issue 2 Pages
187-188
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A stable, crystalline carbenium iodide, which possesses a thiocarbonyl group at the β-position, shows ambident reactivities, thereby reacting with a hard nucleophile OH
− at the carbenium carbon atom and with a soft nucleophile RLi at the thiocarbonyl sulfur atom. Thermal dissociation of the MeLi adduct to a carbene and a ketene dithioacetal is also presented.
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