-
Kin-ichi Tsunoda, Eiichi Yamamoto, Hideo Akaiwa
1996 Volume 25 Issue 11 Pages
919-920
Published: 1996
Released: March 01, 2006
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Blue silicomolybdate anion was adsorbed onto a glass slab optical waveguide (SOWG) surface as an ion associate with cetyltrimethylammonium cation and was detected with the SOWG absorption detector using a semiconductor laser (780 nm) as a light source. The sensitivity of the SOWG method for 2 cm
3 of a pure water sample was ca. 20 times higher than that of conventional spectrophotometry at 3 ppb Si level, and the detection limit was ca. 0.2 ppb Si (S/N = 3).
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Isoroku Nagasawa, Tatsuya Kawamoto, Hiro Kuma, Yoshihiko Kushi
1996 Volume 25 Issue 11 Pages
921-922
Published: 1996
Released: March 01, 2006
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The reaction of [Pt(hfacac)
2] with 2-(ferrocenyl)benzothiazoline affords a novel trinuclear platinum(II) complex, which has six-membered Pt
3S
3 ring with thiolate bridging, and three cyclometallated ferrocenyl groups have a less-symmetrical configuration.
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Haeng-Boo Kim, Shuri Yoshida, Atsushi Miura, Noboru Kitamura
1996 Volume 25 Issue 11 Pages
923-924
Published: 1996
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Absorption microspectroscopy has been conducted to study chemical properties of single melamine-resin microcapsules containing a zinc tetraphenylporphine (ZnTPP)/toluene solution. Although absorbance of ZnTPP in the capsule increased with increasing the capsule diameter, its tendency was much smaller than that expected from a homogeneous distribution of ZnTPP in the inner toluene solution. The results were discussed in terms of a distribution of ZnTPP in both the melamine-resin and toluene phases.
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Koji Kano, Naoya Tanaka, Hideo Minamizono, Yoshihiro Kawakita
1996 Volume 25 Issue 11 Pages
925-926
Published: 1996
Released: March 01, 2006
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The p
Ka values and the
1H NMR spectra of tetraarylporphyrins in the presence of cyclodextrins suggest that the microscopic environment of the positively polarized cavity of cyclodextrin promotes the inclusion of the anionic guest and prohibits the penetration of the cationic guest into the cyclodextrin cavity.
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Satoru Nakashima, Mitsuyori Nakashita, Hiroshi Sakai
1996 Volume 25 Issue 11 Pages
927-928
Published: 1996
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The molecular motion of ferrocene molecules enclathrated in deoxycholic acid was investigated by means of
57Fe Mössbauer spectroscopy, and it was newly suggested that an anisotropic vibration of the ferrocene molecule is coupled with the rotation above 280 K.
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Masami Ito, Yu-saku Takita
1996 Volume 25 Issue 11 Pages
929-930
Published: 1996
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The dinuclear Ni(II) complex [TPANi(II)(μ-OH)
2Ni(II)TPA](ClO
4)
2 (TPA = tris(pyridylmethyl)amine) (
2) can react with atmospheric CO
2 readily, and forms corresponding μ-carbonate complex, [TPANi(II)(μ-CO
3)Ni(II)TPA](ClO
4)
2 (
3).
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Ken-ichi Takao, Yasuyuki Aiba, Hisanaka Ito, Susumu Kobayashi
1996 Volume 25 Issue 11 Pages
931-932
Published: 1996
Released: March 01, 2006
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Highly oxidated sidechain moiety of antitumor terpentecin and related antibiotics is prepared in a stereoselective manner from diacetone glucose through furanoside intermediates.
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Hideki Sugimoto, Yoshihito Hayashi, Chikako Koshi, Shuhei Fujinami, Ma ...
1996 Volume 25 Issue 11 Pages
933-934
Published: 1996
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A class II mixed valent Fe
4(II,III,II,III) complex [Fe
4(Me
4-tpdp)
2(μ-F)
2(OH)
2(H
2O)
2](BF
4)
4 was synthesized, where HMe
4-tpdp is
N,
N,
N′,
N′-tetrakis[2-(6-methylpyridyl)methyl]-1,3-diamino-2-propanol. The crystal structure shows that the complex cation consists of two alkoxo-bridged dinuclear units which are connected by two fluoro bridges to form a bilayered structure (a box structure).
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Yuichi Shimizu, Shunichi Kawanishi
1996 Volume 25 Issue 11 Pages
935-936
Published: 1996
Released: March 01, 2006
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A new and direct method of XeF (351 nm) laser irradiation of acrylic acid
1 solution containing H
2O
2 are described for the chemical synthesis of lactic acid
2. Increase in the yield strongly depended on the irradiation dose and H
2O
2 feeding rate, and the formation of
2 showed the quantum yield, 0.3, and the selectivity, 50%, at the maximum yield. Product analysis indicated that OH radicals formed with high density by the laser-photolysis of H
2O
2 are equally bonded to the carbons of α- and β-positions of
1 to produce
2 and 3-hydroxypropanoic acid with ratio of 1 to 1.
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Toshio Fuchigami, Kayoko Yamamoto
1996 Volume 25 Issue 11 Pages
937-938
Published: 1996
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Oxidative generation of allylic cations having strong electron-withdrawing CF
3 and CF
2Cl groups from 2-(trifluoromethyl)- and 2-(chlorodifluoromethyl)allylsilanes was successfully carried out for the first time. The generated cation was trapped with nucleophiles such as arenes and acetonitrile.
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Naoaki Fujii, Fumitoshi Kakiuchi, Naoto Chatani, Shinji Murai
1996 Volume 25 Issue 11 Pages
939-940
Published: 1996
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The ruthenium- and rhodium-catalyzed intramolecular C-H/olefin coupling reactions of 1-(2-pyridyl)-1,5- and 1,6-dienes proceeded regio- and stereoselecively to give 5- or 6-membered ring products.
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Yuji Kawabuchi, Chiaki Sotowa, Masahiro Kishino, Shizuo Kawano, D. Dua ...
1996 Volume 25 Issue 11 Pages
941-942
Published: 1996
Released: March 01, 2006
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Chemical vapor deposition (CVD) of heterocyclic compounds was examined over commercial pitch-based active carbon fiber (ACF). The ACF treated with pyridine, pyrrole, and thiophene showed excellent preformance in the gas separation of CO
2/CH
4. Thermal stability of the aromatic compounds around 700 °C appears an important factor to restrict its decomposition on the pore wall where the compound is adsorbed and carbonized.
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Manadu Tokeshi, Keiji Nakashima, Teiichiro Ogawa
1996 Volume 25 Issue 11 Pages
943-944
Published: 1996
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The Doppler profiles of the Balmer lines are very broad; their width decreases at lower ion energies. The translational energy distributions of H
* calculated from the Doppler profile have two major components at about 10 eV and at about 100 eV for 2.5 keV of Ar
+.
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Hirotoshi Nakabayashi
1996 Volume 25 Issue 11 Pages
945-946
Published: 1996
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The micro-crystalline ZrO
2 with the monoclinic structure was prepared by the calcination at low temperature of the Zr-hydroxide obtained by the hydrolysis of Zr-alkoxide. Both the strong acid sites and the strong base sites were observed to be simultaneously generated on the monoclinic ZrO
2 surface.
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Warô Nakanishi, Satoko Hayashi, Hitomi Yamaguchi
1996 Volume 25 Issue 11 Pages
947-948
Published: 1996
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The substituent effect on δ(
1Se)
vs. δ(
8Se) in bis[8-arylselanyl)naphthyl] diselenides (
1) was oppsite to that for 1-(methylselanyl)-8-(phenylselanyl)naphthalene and its
p-substituted derivatives. The observation must be the reflection of the 4c-6e interaction between the p-orbitals of the four Se atoms in
1.
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Tsutomu Ioroi, Zempachi Ogumi, Zen-ichiro Takehara, Yoshiharu Uchimoto
1996 Volume 25 Issue 11 Pages
949-950
Published: 1996
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Dense and thin LaMnO
3/YSZ/La
0.85Sr
0.15MnO
3 cell was perpared by CVD-EVD process. The prepared LaMnO
3 film was sufficiently uniform and dense, no pore or crack was observed in the LaMnO
3 film. AC impedance measurements indicated that the electrode interface conductivity was linearly dependent on the electrode surface area. For dense and thin film electrode of LaMnO
3, oxygen electrochemical reacion proceeded predominantly at the electrode surface region.
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Yoshio Sugiyama
1996 Volume 25 Issue 11 Pages
951-952
Published: 1996
Released: March 01, 2006
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Electron Spin Resonance (ESR) examinations of the propagating radicals in the polymerization of methyl acrylate (MA) and methyl acrylate-α-d (MA-d) in the frozen state have been made. Selective deuteration of MA showed that the propagating radicals have the chain-end (I) and not the mid-chain (II) structure. The stable conformation of poly (methyl acrylate) (poly (MA)) radical was also determined.
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Masashi Ishikawa, Hiroyuki Okimoto, Masayuki Morita, Yoshiharu Matsuda
1996 Volume 25 Issue 11 Pages
953-954
Published: 1996
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The photoinduced electrochemical oxidation of benzyl alcohol to benzaldehyde in acidic acetonitrile proceeded with practically 100% product selectivity and ca. 100% current efficiency under visible-light irradiation in the presence of riboflavin-2′,3′,4′,5′-tetraacetate (RF) as a mediator. A double mediatory system involving duroquinone as well as RF resulted in remarkable acceleration of the benzaldehyde formation with maintenance of both the high product selectivity and high current efficiency.
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Eiji Yashima, Yukio Maeda, Yoshio Okamoto
1996 Volume 25 Issue 11 Pages
955-956
Published: 1996
Released: March 01, 2006
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Cis-transoidal poly(4-(
N,
N-diisopropylaminomethyl)phenylacetylene) prepared by polymerization with [Rh(nbd)Cl]
2 was found to exhibit an induced circular dichroism in the UV-visible region upon complexation with optically active acids probably due to a prevailing one-handed helix formation of the polymer, the sign of which reflects the absolute configuration of the acids.
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Zhi Yu, Yuan Zhou, Wei Yang, Yunpeng Tian, Cun-ying Duan, Rongchuan Li ...
1996 Volume 25 Issue 11 Pages
957-958
Published: 1996
Released: March 01, 2006
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Investigation of the new mixed-valence trinuclear complexes of FcMFc (M = Ni, Cu) indicates that intramolecular long-range charge transfer for FcNiFc complex processes in timescale 1.6•10
6 s
−1 through a long bridge including a coordinated bond at room temperature.
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Kanji Kubo, Tadamitsu Sakurai
1996 Volume 25 Issue 11 Pages
959-960
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N,
N′-Bis(1-pyrenylmethyl)-4,13-diaza-18-crown-6 ether was found to display unique photophysical properties in the presence of the guest metal salts. The binding of metal ions to the azacrown ether cavity inhibited the exciplex formation and changed the distance between two pyrenyl groups. This caused not only the emission-intensity anhancement but also a large change in the monomer/excimer fluorescence-intensity ratio.
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Yutaka Nishigaichi, Miyuki Yoshikawa, Yasuyo Takigawa, Akio Takuwa
1996 Volume 25 Issue 11 Pages
961-962
Published: 1996
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A new type of asymmetric induction from allylic tin reagents is developed. A chiral allylic tin which has an oxygen substituent (ether or ester) at its δ-position successfully induces a new chirality in a 1,4-induction mode in the reaction with aldehydes via the transmetallation with SnCl
4.
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Atsushi Ikeda, Yoshio Suzuki, Kiyotaka Akao, Seiji Shinkai
1996 Volume 25 Issue 11 Pages
963-964
Published: 1996
Released: March 01, 2006
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A novel globular molecule was synthesized by doubly-bridging calix[8]arene at 1,5- and 3,7-phenol units. The structure is very unique because of its high molecular symmetry and eight oxygens convergently integrated in a cavity. Extraction and
1H NMR spectroscopic studies established that this cavity shows the high Cs
+ affinity as well as the high Cs
+/Na
+ selectivity.
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Anima Boruah, Mukulesh Baruah, Dipak Prajapati, Jagir S. Sandhu
1996 Volume 25 Issue 11 Pages
965-966
Published: 1996
Released: March 01, 2006
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The Michael reaction of α,β-ethylenic ketones with nitroalkane, diethylmalonate, acetonitrile and acetylacetone in presence of alumina and without any solvent, under microwave irradiations proceeded very efficiently and furnished excellent yields of adducts.
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Chiaki Sotowa, Yuji Kawabuchi, Isao Mochida
1996 Volume 25 Issue 11 Pages
967-968
Published: 1996
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Pitch-based active carbon fiber (pitch-ACF) modified by pyridine chemical vapor deposition (CVD) showed excellent catalytic activity for dehydrochlorination of 1, 2-dichloroethane (1, 2-DCE) into vinyl chloride (VC). Compared with polyacrylonitrile-based ACF (PAN-ACF), the present ACF of 2% weight increase by CVD showed long life over 300 h at 360 °C (conversion: ca. 20%; VC selectivity: 99.7%; contact time: 5.8 × 10
−3).
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Hiroshi Tsukube, Satoshi Shinoda, Jun’ichi Uenishi, Mihoko Shiod ...
1996 Volume 25 Issue 11 Pages
969-970
Published: 1996
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Lipophilic lanthanide tris(β-diketonates) effectively mediated transport of the aliphatic amino acids such as valine and leucine under neutral conditions, though conventional carriers rarely transported these zwitterions.
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Ichiro Matsubara, Ryoji Funahashi, Noriaki Kida, Kazuo Ueno
1996 Volume 25 Issue 11 Pages
971-972
Published: 1996
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The layered manganocuprate Ln
3Ba
2Mn
2Cu
2O
12 (Ln = lanthanide) consists of an intergrowth of single rock-salt layers with quadruple oxygen-deficient perovskite layers. This structure is stabilized by a particular ionic size at the Ln site (Ln = Sm, Eu, Gd). The ground state changes from a spin glass to a ferromagnetic phase with decreasing size of the Ln ion (Sm → Gd).
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Isao Takahara, Masahiro Saito
1996 Volume 25 Issue 11 Pages
973-974
Published: 1996
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The effects of carbon dioxide in the dehydrogenation of C
3H
8 to produce C
3H
6 were investigated over several Cr
2O
3 catalysts supported on Al
2O
3, active carbon and SiO
2. Carbon dioxide exerted promoting effects only on SiO
2-supported Cr
2O
3 catalyst. The promoting effects of carbon dioxide over a Cr
2O
3/SiO
2 catalyst were to enhance the yield of C
3H
6 and to suppress the catalyst deactivation.
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Takumi Konno, Ken-ichi Okamoto
1996 Volume 25 Issue 11 Pages
975-976
Published: 1996
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The reaction of [Ni{Co(aet)
2(en)}
2]
4+ (
1) with excess CdCl
2 gave an S-bridged Co
IIICd
II dinuclear complex, [CdCl
3{Co(aet)
2(en)}] (
2), which is interconvertible to a Co
III4Cd
II2 hexanuclear complex, [Cd
2Cl{Co(aet)
2(en)}
4]
7+ (
3). X-Ray analyses of
2 and
3(NO
3)
7 indicated that each Cd atom in the complexes has a trigonal-bipyramidal geometry.
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Takumi Konno, Chieko Sasaki, Ken-ichi Okamoto
1996 Volume 25 Issue 11 Pages
977-978
Published: 1996
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The reaction of
fac(S)-[Rh(aet)
3] (aet = NH
2CH
2CH
2S
−) with Pd
II gave a novel S-bridged Rh
III3Pd
II2 pentanuclear complex, [Pd{Pd(aet)}{Rh(aet)
2}{Rh(aet)
3}
2]
4+ (
1), of which bromide salt was spontaneously resolved.
1 was converted into [Pd{Pd(aet)}{Rh(aet)(NH
2CH
2CH
2SCH
3)}{Rh(aet)
3}
2]
5+ (
2) by methylation reaction.
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Jun-ichi Shimoda, Hideki Furutachi, Masami Yonemura, Masaaki Ohba, Nao ...
1996 Volume 25 Issue 11 Pages
979-980
Published: 1996
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A diphenoxo-bridged Co(II)Pd(II) complex of a dinucleating macrocycle, derived from the [2:1:1] condensation of 2,6-diformyl-4-methylphenol, ethylenediamine and diethylenetriamine, forms a reversible dioxygen-adduct in solid state.
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Atsuko Tomita, Mitsuru Sano
1996 Volume 25 Issue 11 Pages
981-982
Published: 1996
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Thin layer cyclic voltammograms have been measured for (1,5-dithiacyclooctane 1-oxide) bis(pentaammineruthenium(II)) in acetone. The rates of the interconversions of the two intermediate species are determined to be 2 × 10
−4 s
−1 and 4.4 × 10
−4 s
−1 by digital simulations to the thin layer voltammograms. The half life of the memory in the molecule is 1600 s.
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Sang-Bong Lee, Kyu-Wan Lee, Toshikazu Takata, Takeshi Endo
1996 Volume 25 Issue 11 Pages
983-984
Published: 1996
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A polymeric cationic species (
III) could be isolated in the cationic polymerization of styrene with an
N-benzyl pyridinium salt (MBCP) by adding the corresponding pyridine (OCP).
III is considered to be a terminated end which is active enough to initiate the cationic polymerization since it has still an
N-benzyl pyridinium salt structure. Therefore,
III could initiate the cationic polymerization of epoxides to give the block copolymers of styrene and epoxides.
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Akira Mori, Hiroko Kawakami, Hitoshi Takeshita, Tetsuo Nozoe
1996 Volume 25 Issue 11 Pages
985-986
Published: 1996
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3-Methoxy-1,5-azulenequinone gave dimers when irradiated with a high-pressure mercury lamp. The product distribution was dependent on the polarity of the solvent. In a polar solvent, a head-to-head dimer was predominant whereas a head-to-tail dimer was mainly formed in a nonpolar solvent.
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Takashi Kamikubo, Kunio Ogasawara
1996 Volume 25 Issue 11 Pages
987-988
Published: 1996
Released: March 01, 2006
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A new stereocontrolled route to (−)-shikimic acid, the component of the fruit of shikimi tree,
Illicium religiosum, and the key biogenetic precursor of a variety of aromatic natural products, has been developed using the chiral 2,5-cyclohexadienol synthon.
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Nobuhiro Kumada, Masakazu Takagi, Nobukazu Kinomura
1996 Volume 25 Issue 11 Pages
989-990
Published: 1996
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Rubidium ion in Rb
8Nb
22O
59 with a tunnel structure was ion-exchanged with alkaline ions and proton. The ion-exchange with proton was almost complete to yield H
7.71Rb
0.29Nb
22O
59·8.9H
2O. The degree of ion-exchange with alkaline ions was 79.1%(Na
+), 41.8%(K
+) and 2.5%(Cs
+), and the chemical compositions for the ion-exchanged compounds were Rb
1.27Na
6.33H
0.40Nb
22O
59·6.1H
2O, Rb
3.06K
3.34H
1.60Nb
22O
59·5.1H
2O and Rb
6.22Cs
0.20H
1.58Nb
22O
59·1.9H
2O. The ion-exchange of H
7.71Rb
0.29Nb
22O
59·8.9H
2O with alkaline ions was also attempted.
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Masaru Sato, Masa-aki Sensui
1996 Volume 25 Issue 11 Pages
991-992
Published: 1996
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The first transition metal-stabilized complex of 2,4-cyclopentadien-1-thione was synthesized in the oxidation of diruthenocenyl disulfide with p-BQ/BF
3·OEt
2.
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Toshiyuki Saiki, Kei Goto, and Renji Okazaki
1996 Volume 25 Issue 11 Pages
993-994
Published: 1996
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Two conformationally frozen isomers of a 1,4-bridged calix[6]arene, one of which is a cone conformer while the other adopts a 1,2,3-alternate conformation, have been isolated by silica-gel chromatogarphy. The interconversion between them was not observed even after heating either of them at 120 °C.
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Motohiro Akazome, Atsuko Sumikawa, Ryo-ichi Sonobe, Katsuyuki Ogura
1996 Volume 25 Issue 11 Pages
995-996
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(
R)-(1-Naphthyl)glycyl-(
R)-phenylglycine forms inclusion compounds with ethers (tetrahydrofuran and diethyl ether) or allylic alcohols (2-propen-1-ol and 2-methyl-2-propen-1-ol). X-ray crystallographic study showed that the dipeptide has the ability to optionally form “parallel or antiparallel” β-sheet-like structures by the choice of ethers or allylic alcohols, respectively, as the guest molecules.
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Takayuki Kondo, Kiyoshi Hasegawa, Chiharu Kitagawa, Ryutaro Uchida, Ma ...
1996 Volume 25 Issue 11 Pages
997-998
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To estimate the effect of tree planting on atmospheric phenol, the absorption of phenol by evergreen broad-leaved tree species was examined. In experiments in which the light intensity was varied for camellia, a linear relationship between the phenol absorption rate and the transpiration rate was observed, showing that atmospheric phenol is absorbed through the stomata. The absorption rates for five tree species varied from 21.3 (camellia) to 52.3 ng dm
−2h
−1ppb
−1 (oleander) at 1000 μmol of photons m
−2s
−1 and the trees exhibiting higher transpiration rates had greater absorption rates of phenol.
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Hideaki Watanabe, Seiji Ogo, Takeshi Yamamura
1996 Volume 25 Issue 11 Pages
999-1000
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The route for the syntheses of alkanthiols having bulky groups at the neighborhood of sulfur atoms was improved, and applied for the preparation of thiol ligands that mimic the cysteine containing metal binding sites in proteins. The new method developed the deprotection of tetrahydropyranyl group from α,α-diphenylalkyl 2-tetrahydropyranyl sulfides.
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Kazuko Takahashi, Toshihiro Ise, Takehiko Mori, Hatsumi Mori, Shoji Ta ...
1996 Volume 25 Issue 11 Pages
1001-1002
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1,3-Bis(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3-dihydrobenzo[c]selenophene (BEDT-BDTBS) has been synthesized by a convenient method and the electric properties and X-ray crystal structures of its single-crystalline cation radical salts have been clarified.
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Ryuichiro Hara, Zhenfeng Xi, Martin Kotora, Chanjuan Xi, Tamotsu Takah ...
1996 Volume 25 Issue 11 Pages
1003-1004
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Replacement of an alkyne moiety of zirconacyclopentadienes via β,β′-carbon-carbon bond cleavage was highly dependent on their substituents. Complete differentiation between diphenylacetylene and 4-octyne in the reaction with butyronitrile was demonstrated.
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Rong Wang, Tomokazu Iyoda, Lei Jiang, Kazuhito Hashimoto, Akira Fujish ...
1996 Volume 25 Issue 11 Pages
1005-1006
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An azobenzene-functionalized meterial was used to perform comparative investigation of molecular arrangements in self-assembled monolayer film and in crystalline state. By the means of atomic force microscopy and absorption spectroscopy, a unique herringbone structure was revealed in the densely packed self-assembled monolayer film.
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Kohei Tamao, Kazunori Nakamura, Shigehiro Yamaguchi, Motoo Shiro, Seik ...
1996 Volume 25 Issue 11 Pages
1007-1008
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A series of 2,3-bis(siloxy)-1,4-bis(diphenylphosphino)butanes SILOPs, possessing various siloxy groups, and their Rh(I) complexes have been prepared. The X-ray structure of a SILOP shows a staggered conformation with two siloxy groups in the anti positions. The X-ray crystal structure of a cationic Rh(I)-SILOP complex, however, shows an
anti arrangement of not the two siloxy groups but the two silyl groups with respect to the O–O axis, which reinforces the
C2-symmetrical environment around the metal center.
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Katsumi Takayama, Kenji Kano, Tokuji Ikeda
1996 Volume 25 Issue 11 Pages
1009-1010
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A carbon electrode modified with immobilized cells of
Paracoccus denitrificans has been found to produce catalytic currents for the reduction of nitrate and nitrite in the presence of durohydroquinone. It has been shown that durohydroquinone functions as an electron transfer mediator between the electrode and the bacterial cells to drive electrochemically the denitrifying reaction of
Paracoccus denitrificans.
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Dwi Siswanta, Masanori Kin, Hideaki Hisamoto, Koji Suzuki
1996 Volume 25 Issue 11 Pages
1011-1012
Published: 1996
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Several N-hydroxylamide derivatives were developed, exhibiting high selectivity for Hg
2+, which are useful as sensory molecules for a potentiometric ion sensor.
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