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Takeyoshi Yagyu, Shoko Oya, Masunobu Maeda, Koichiro Jitsukawa
2006 Volume 35 Issue 2 Pages
154-155
Published: 2006
Released: December 27, 2005
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Two palladium(II) complexes with tridentate N-heterocyclic carbene ligands containing aryloxy groups were prepared and characterized by X-ray crystallographic method. They showed good performance for Heck reaction.
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Akira Ikezaki, Mikio Nakamura, Ru-Jen Cheng
2006 Volume 35 Issue 2 Pages
156-157
Published: 2006
Released: December 27, 2005
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NMR spectra of highly saddled Mn(III) porphyrinates such as Mn(OETPP)(CD
3OD)
2+ have been measured. The extraordinarily upfield shifted
meso-
13C signals, which reach as much as −492 ppm at 298 K, are ascribed to the d
x2−y2–a
2u, d
xy–a
1u, and d
π–3e
g interactions, the former two of which occur only when the porphyrin ring is saddled.
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Tsutomu Ishi-i, Hiroshi Tashiro, Rempei Kuwahara, Shuntaro Mataka, Tos ...
2006 Volume 35 Issue 2 Pages
158-159
Published: 2006
Released: December 27, 2005
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Supplementary material
In a donor–acceptor system with structural similarity and electronic complimentarity, an efficient energy transfer was observed from energy-donor triphenylenes to energy-acceptor hexaazatriphenylenes in a film state.
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Akira Makino, Junji Sakamoto, Masashi Ohmae, Shiro Kobayashi
2006 Volume 35 Issue 2 Pages
160-161
Published: 2006
Released: December 27, 2005
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6-Deoxy-6-fluoro sugar oxazoline derivatives were synthesized and evaluated their polymerizabilities with the catalysis of chitinase. The polymerizability of an
N-acetyl-6-deoxy-6-fluoroglucosamine oxazoline was lower than that of non-fluorinated
N-acetylglucosamine oxazoline, only providing the ring-opened hydrolyzate. The disaccharide oxazoline derivative of
N,
N′-diacetyl-6′-deoxy-6′-fluorochitobiose exhibited lower polymerizability with the enzyme compared to that of the non-fluorinated
N,
N′-diacetylchitobiose oxazoline, providing the corresponding fluorinated chitin derivative in good yields within 4 h. These results suggest that the fluorine atom-incorporation reduced the reactivity of the oxazolines.
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Peng Gao, Yi Xie, Lina Ye, Ying Chen, Zhen Li
2006 Volume 35 Issue 2 Pages
162-163
Published: 2006
Released: December 27, 2005
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Supplementary material
Multicomponent BaMo
2O
7 single-crystalline nanowire bundles were synthesized by a hydrothermal crystallization process under mild conditions using cheap and simple bulky oxide and fluoride as precursors. This new strategy has been extended to prepare other 1D molybdenum oxide-based nanomaterials including alkaline earth metal molybdate compounds (such as BaMo
3O
10), transition-metal molybdate compounds (e.g., CdMoO
4, PbMoO
4, Ag
6Mo
10O
33, etc.) and metal molybdenum oxide fluoride compounds (e.g., Ba
2MoO
3F
4). Our experiments have also proved that this facile hydrothermal route is a general method for the synthesis of various multicomponent nanomaterials (such as tungstate, chromate, phosphate compounds).
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Shunpei Ishikawa, Kei Manabe
2006 Volume 35 Issue 2 Pages
164-165
Published: 2006
Released: December 27, 2005
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A two-step Suzuki–Miyaura coupling–triflation procedure, which features the use of hydroxyphenylboronic acids or anhydrides in the palladium-catalyzed cross-coupling step, has been developed for the synthesis of oligoarenes.
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Julie Leroy, Jeremy Levin, Sergey Sergeyev, Yves Geerts
2006 Volume 35 Issue 2 Pages
166-167
Published: 2006
Released: January 07, 2006
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Supplementary material
This communication describes extremely simple one-step synthesis of α,α′-dialkyloligothiophenes by the lithiation/alkylation of the corresponding commercially available oligothiophenes. Use of
t-BuOK to enhance the reactivity of lithiated oligothiophene species towards alkyl halides is crucially important.
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Tsumoru Morimoto, Shuji Nagano, Daishi Yokoyama, Masutaka Shinmen, Kiy ...
2006 Volume 35 Issue 2 Pages
168-169
Published: 2006
Released: January 07, 2006
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Hexadehydrodibenzo[12]annulene annelated by a cyclopentadienone moiety was synthesized. On the basis of the theoretical calculations and experimental NMR and IR spectra, it was shown to be weakly aromatic owing to the contribution of the diatropic [15]annulenone resonance structure.
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Lijie Chen, Haining Hu, Yangxian Li, Guifeng Chen, Shuyun Yu, Guanghen ...
2006 Volume 35 Issue 2 Pages
170-171
Published: 2006
Released: January 07, 2006
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Highly ordered CoSb
3 nanowire arrays have been fabricated successfully by direct current electrodeposition from aqueous solution into the pores of a porous anodic aluminum oxide (AAO) template. Extensive characterization of the as-synthesized sample has been performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and energy-dispersive X-ray spectroscopy (EDS). The analysis indicates that the CoSb
3 nanowires are single crystals with highly preferential orientation and the atomic ratio of Co to Sb is very close to 1:3.
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Manabu Hatano, Takafumi Asai, Kazuaki Ishihara
2006 Volume 35 Issue 2 Pages
172-173
Published: 2006
Released: January 07, 2006
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Supplementary material
Chiral self-assembled macrocyclic Pd(II) and Cu(II) complexes with trans-chelation of
n:
n metal–bidentate
P,
N- and
N,
N-ligands have been designed toward the possibility of asymmetric Diels–Alder catalysis.
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Naoko Yamaguchi, Tomohiko Nakamura, Kiyoharu Tadanaga, Atsunori Matsud ...
2006 Volume 35 Issue 2 Pages
174-175
Published: 2006
Released: January 07, 2006
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We have successfully immobilized Zn–Al layered double hydroxide (LDH) directly on glass substrates through the sol–gel method with hot water treatment. Al
2O
3–ZnO thin films were originally prepared on glass substrates by the sol–gel method with a heat treatment at 400 °C for 30 min, and then the films were immersed in distilled water at 100 °C for 15 min to form nanocrystalline Zn–Al LDH with hexagonal structure.
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Weilin Wei, Masato Kobayashi, Yutaka Ukaji, Katsuhiko Inomata
2006 Volume 35 Issue 2 Pages
176-177
Published: 2006
Released: January 07, 2006
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The asymmetric addition of alkynylzinc reagents, prepared in situ from dialkylzinc and 1-alkynes, to nitrones was achieved by utilizing di(
t-butyl) (
R,R)-tartrate as a chiral auxiliary to afford the corresponding optically active (
R)-α-substituted propargylic
N-hydroxylamines. By the addition of product-like
N-hydroxylamine, unprecedented enhancement of enantioselectivity was observed to afford the
N-hydroxylamines up to 95% ee.
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Qinghui Cao, Yongqian Gao, Xiangying Chen, Li Mu, Weichao Yu, Yitai Qi ...
2006 Volume 35 Issue 2 Pages
178-179
Published: 2006
Released: January 07, 2006
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Supplementary material
Hollow SnO
2 nanospheres with diameters ranging from 100–120 nm have been synthesized via a room-temperature wet-chemical route. A possible formation mechanism of the hollow SnO
2 nanospheres is briefly discussed.
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Haruhiko Fukumoto, Shusaku Nagano, Takahiro Seki
2006 Volume 35 Issue 2 Pages
180-181
Published: 2006
Released: February 05, 2006
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Photopolymerization of liquid crystalline monomers was achieved within photoaligned mesoporous silica film. After resolving the template of silica networks, bundles of nanofibers containing polymer chains with a narrow molecular weight distribution were obtained.
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Soichiro Kyushin, Yoshinori Ueta, Ryoji Tanaka, Hideyuki Matsumoto
2006 Volume 35 Issue 2 Pages
182-183
Published: 2006
Released: January 14, 2006
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Supplementary material
Hexa-, hepta-, and octacyclic ladder polysilanes (
5–
7) were synthesized, and their structures were determined by X-ray crystallography. These compounds have the double helix structure consisting of two linear polysilane chains. In the UV–visible spectra, the lowest energy absorption maxima of
5–
7 shift bathochromically as the number of cyclotetrasilane rings progressively increases.
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Katsuaki Konishi, Takayuki Hiratani
2006 Volume 35 Issue 2 Pages
184-185
Published: 2006
Released: January 14, 2006
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Zn
10S
16 and Cd
10S
16 clusters bearing twelve naphthalene units on the surface showed characteristic blue emission in response to the cation–π-mediated intercalative binding of quaternary ammonium cations that allows the formation of ground-state naphthalene aggregates.
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Kohichi Kashiwagi, Ryoji Sugise, Toshihiro Shimakawa, Tunao Matuura, M ...
2006 Volume 35 Issue 2 Pages
186-187
Published: 2006
Released: February 05, 2006
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Supplementary material
A new type of catalyst system using ruthenium and carboxylic acid is useful for the tail-to-tail dimerization of acrylonitrile, proceeding without the formation of undesired by-product propionitrile. Carboxylic acids having p
Ka 3.5–5 are suitable as co-catalysts for the dimerization of acrylonitrile. The relationship between the logarithm of the relative rate in the dimer formation and the p
Ka of
m- and
p-substituted benzoic acids (Brønsted plot) was linear (
R2 = 0.946) with a slope of −0.199. The role of the carboxylic acids can be considered to be effective protonation in the protonolysis of the carbon–ruthenium bond of an intermediate Ru complex.
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Norihito Hiyoshi, Eiichi Mine, Chandrashekhar V. Rode, Osamu Sato, Mas ...
2006 Volume 35 Issue 2 Pages
188-189
Published: 2006
Released: January 14, 2006
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cis-Decalin was selectively obtained with high
cis/
trans ratio (83%) over a carbon-supported rhodium catalyst at 333 K under 6 MPa of hydrogen and 15 MPa of carbon dioxide.
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Qinghong Zhang, Fei Lü, Changli Li, Ye Wang, Huilin Wan
2006 Volume 35 Issue 2 Pages
190-191
Published: 2006
Released: January 14, 2006
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Helical mesoporous silica nanorods have been synthesized with high efficiency by the addition of 1-alkanol or 1-aminoalkane with proper carbon chain length (C
4–C
8) as a cosurfactant of cetyltrimethylammonium bromide (CTAB) during the synthesis of MCM-41 in a dilute synthesis gel containing CTAB, tetraethyl orthosilicate, ammonium hydroxide, and water.
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Hideki Masuda, Yoshitaka Matsui, Tetsuya Miwa, Mitsutaka Nagae, Miyuki ...
2006 Volume 35 Issue 2 Pages
192-193
Published: 2006
Released: February 05, 2006
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Metal (Ta) films with ordered structures of nanometer-scale dimensions were fabricated by replicating the structure of a 2D array of ferritin molecules as a template. The deposition of a Ta layer onto a 2D array of ferritin molecules using ion-beam sputtering and subsequent removal of the ferritin molecules generated Ta films with an ordered array of concave with a 13 nm interval. The uniformity and chemical stability of Ta formed by ion-beam sputtering contributed to the precise replication of the fine structures of the 2D array of ferritin molecules.
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Nozomi Inoue, Hideyuki Otsuka, Shin-Ichiro Wada, Atsushi Takahara
2006 Volume 35 Issue 2 Pages
194-195
Published: 2006
Released: January 14, 2006
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The hybrid hydrogel composed of tubular aluminosilicate nanofiber, “imogolite,” and pepsin was prepared in a simple manner. We confirmed the formation of a network structure of imogolite in hydrogel by FE-SEM observations. Pepsin immobilized onto imogolite showed enzymatic activity after repeated reactions.
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Satsuki Asami, Koichi Saitoh
2006 Volume 35 Issue 2 Pages
196-197
Published: 2006
Released: January 14, 2006
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The octanol/water partition coefficients (
POW) were predicted for five vanadium(IV)–porphyrin complexes which were taken as model compounds of petroporphyrin. The correlation between the reversed-phase liquid chromatographic retention factor and the
POW observed for standards was applied to the prediction. The log
POW values estimated for the metalloporphyrins range from 5.8 (for 5,10,15,20-tetramethylporphine complex) to 10.1 (for 2,3,7,8,12,13,17,18-octaethylporphine complex).
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Tetsuya Yamamoto, Michiko Iizuka, Tetsuo Ohta, Yoshihiko Ito
2006 Volume 35 Issue 2 Pages
198-199
Published: 2006
Released: January 14, 2006
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1,4-Addition of arylboronic acids to α,β-unsaturated ketones was smoothly catalyzed by palladium(0) phosphine complexes with chloroform in the presence of base. It is remarked that the palladium(0) complexes have no catalytic activity in the absence of chloroform. The reaction proceeded without β-hydride elimination.
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Yuyang Liu, Ronghua Wang, Wei Chen, Xianqiong Chen, Zhigang Hu, Xiaoyi ...
2006 Volume 35 Issue 2 Pages
200-201
Published: 2006
Released: January 14, 2006
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Inspired by the formation of stalagmite in nature, calcium carbonate nanoparticles (CaCO
3) have been successfully generated along multiwalled carbon nanotubes (MWNTs) backbones periodically via a very simple wet chemical route, thus forming the kabob-like MWNTs–CaCO
3 hybrids. These MWNTs–CaCO
3 hybrids are expected to have many potential applications in biomaterials and polymer reinforcement.
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Yan Zou, Bin Yue, Bin Zhang, Heyong He
2006 Volume 35 Issue 2 Pages
202-203
Published: 2006
Released: January 21, 2006
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Cs
xH
3−xPW
12O
40 salts prepared by a simple solid-synthesis method show good catalytic activity in
n-butane isomerization as those analogues prepared by traditional liquid-preparation method.
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Akiko Kotachi, Hiroaki Imai
2006 Volume 35 Issue 2 Pages
204-205
Published: 2006
Released: January 21, 2006
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Supplementary material
Ordered microarrays of rectangular calcite, platy vaterite and spicular aragonite were selectively obtained through overgrowth from planar films prepared with polymeric species. We successfully visualized the polymorphs of the calcium carbonate films using the overgrowth technique.
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Masashi Otsuki, Yoshihiro Sasaki, Shintaro Iwamoto, Jun-ichi Kikuchi
2006 Volume 35 Issue 2 Pages
206-207
Published: 2006
Released: January 21, 2006
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Supplementary material
Selective liposomal assembling in aqueous solution was achieved by ion-recognizable gemini peptide lipids as an inducer. The methodology was extended to liposomal sorting on a substrate covered with a supported bilayer membrane, which was confirmed by means of fluorescence and atomic force microscopy, fluorescence spectroscopy, and quarts crystal microbalance measurements.
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Chunlei Lin, Yoshikazu Hiraga, Katsuo Ohkata
2006 Volume 35 Issue 2 Pages
208-209
Published: 2006
Released: January 21, 2006
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The solvent effects on stereoselectivity in the Diels–Alder reaction of cyclopentadiene, the [2 + 2]photodimerization of 2-cyclopentenone, and the enzymatic asymmetrization of prochiral 1,3-propanediols were analyzed by two-parameter treatment using both the dielectric constant and the solubility parameter to show a good linear relationship.
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Ewa Janus, Marek Lozynski, Juliusz Pernak
2006 Volume 35 Issue 2 Pages
210-211
Published: 2006
Released: January 21, 2006
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The quantitative isomerization of (
Z)- to (
E)-alkene in protic, imidazolium ionic liquids is demonstrated. The isomerization parameters were determined. The mechanism on the addition of the protic imidazolium species to carbon–carbon double bond is presented.
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Hisahiro Sasabe, Nobuhiro Kihara, Kazuhiko Mizuno, Akiya Ogawa, Toshik ...
2006 Volume 35 Issue 2 Pages
212-213
Published: 2006
Released: January 21, 2006
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The hydroruthenation of pseudorotaxane
1·DB24C8 having an alkyne moiety at the axle terminal with RuHCl(CO)(PPh
3)
3 gave [2]rotaxane
2 with an alkenylruthenium complex moiety in a good yield. The carbometalation of allenes with
2 resulted in the formation of the corresponding [2]rotaxanes
3 with η
3-allylruthenium complex moieties in good yields.
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Shin-ya Onoue, Junhui He, Toyoki Kunitake
2006 Volume 35 Issue 2 Pages
214-215
Published: 2006
Released: January 21, 2006
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Supplementary material
Densely assembled gold nanoparticles were treated by low temperature oxygen plasma to undergo complete fusion due to removal of organic protecting groups. Nanosheet and nanowire of gold with thicknesses of less than 10 nm were formed at room temperature without oxidation. Their sizes reached more than several hundred nanometers, demonstrating the effectiveness of the current method to fabricate nanoscopic architectures of mesoscopic sizes.
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Yunpeng Xu, Zhijian Tian, Guodong Wen, Zhusheng Xu, Wei Qu, Liwu Lin
2006 Volume 35 Issue 2 Pages
216-217
Published: 2006
Released: January 21, 2006
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CO
x-free hydrogen could be produced by hydrothermal catalytic reforming process when Ca(OH)
2 was added into the reaction, and biomass-derived alcohols were used as the reactants.
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Thomas Gumpenberger, Tadatake Sato, Ryozo Kurosaki, Aiko Narazaki, Yos ...
2006 Volume 35 Issue 2 Pages
218-219
Published: 2006
Released: January 21, 2006
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A novel microfluidic device incorporating a two-dimensional array of microbeads with 10 μm diameter was fabricated. Surface-modified microbeads to be used as detectors were arranged into microstructures prepared at the surface of a silica glass plate by laser-micromachining and sealed with a polydimethylsiloxane (PDMS) plate to form microchannels. The capturing reaction of surface amino groups with fluorescein isothiocyanate (FITC) supplied via microchannels was examined.
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Noriyoshi Nagahora, Takahiro Sasamori, Norihiro Tokitoh
2006 Volume 35 Issue 2 Pages
220-221
Published: 2006
Released: January 21, 2006
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Supplementary material
Kinetically stabilized 1,1′-bis(diphosphenyl)ferrocenes have been synthesized by taking advantage of extremely bulky substituents, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl (Bbt) groups, and fully characterized by the spectroscopic and X-ray crystallographic analyses. The electrochemical behavior showed well-defined two reversible one-electron reduction couples.
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Wei Yang, Tatsuo Kaneko, Xiao-Ya Liu, Ming-Qing Chen, Mitsuru Akashi
2006 Volume 35 Issue 2 Pages
222-223
Published: 2006
Released: January 21, 2006
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Supplementary material
Poly(
tert-butyl methacrylate) macrointermediates (PtBMA-Br) with a bromine atom end group were synthesized in the presence of the single ligand
N,
N,
N′,
N″,
N″-pentamethyldiethylenetriamine (PMDETA) by atom transfer radical polymerization (ATRP) in bulk. A macromonomer was successfully prepared by the nucleophilic substitution of the chain end to attain a high efficiency of C=C incorporation (89–92%;
1H NMR). The macromonomer molecular weight was controlled to result in a high molecular weight (11000) with a narrow distribution of 1.20.
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Rieko Takamatsu, Kiyotaka Asakura, Wang-Jae Chun, Tsuyoshi Miyazaki, M ...
2006 Volume 35 Issue 2 Pages
224-225
Published: 2006
Released: January 21, 2006
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We investigated local structures around cadmium (Cd) sorbed on montmorillonite at various pH values by EXAFS (extend X-ray absorption fine structure). We found two sorption types, an outer-sphere complex and a surface precipitate. The outer-sphere complex was mainly formed at a lower pH which had an identical structure to aqueous Cd
2+, while the surface precipitate was found at high pH which had a one-layer Cd
5(OH)
8(NO
3)
2(H
2O)
2-like structure.
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Qi Xun Shi, Rong Wen Lu, Kun Jin, Zhu Xia Zhang, De Feng Zhao
2006 Volume 35 Issue 2 Pages
226-227
Published: 2006
Released: January 21, 2006
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Supplementary material
N-Arylhydroxylamines were prepared in high yields through chemoselective reduction of the corresponding aromatic nitro compounds under ultrasound (59 kHz) at room temperature using a convenient Zn/HCOONH
4/CH
3CN system. This method was highly efficient, environmentally benign, especially simple and practical.
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Akihiro Okabe, Makiko Niki, Takanori Fukushima, Takuzo Aida
2006 Volume 35 Issue 2 Pages
228-229
Published: 2006
Released: January 21, 2006
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Supplementary material
Heating of mesoporous silica hybridized with self-assembled disc-like molecules such as hexabenzocoronene and triphenylene derivatives at ≥900 °C under N
2 resulted in low-temperature crystallization of its amorphous silicate framework into cristobalite, a form of crystalline silica that appears in a much higher temperature range in the phase diagram.
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Jing Chen, Pengyi Zhang, Li Zhang
2006 Volume 35 Issue 2 Pages
230-231
Published: 2006
Released: January 21, 2006
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Perfluorooctanoic acid was photocatalytically decomposed by using TiO
2/Ni–Cu, and a small bias potential (−0.1 V) applied on TiO
2/Ni–Cu electrode greatly enhanced its decomposition.
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Akihiko Hatano, Aiko Harano, Masayuki Kirihara
2006 Volume 35 Issue 2 Pages
232-233
Published: 2006
Released: January 21, 2006
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Thymidine phosphorylase in phosphate buffer catalyzed the conversion of thymidine to unnatural nucleosides. The 3′-OH, but not the 5′-OH of ribosyl moiety is necessary to be recognized as a substrate. Thus 3′-deoxythymidine could not convert to 5-fluorouracil-2′,3′-dideoxyribose. However, 5′-deoxythymidine was converted to 5-fluorouracil-2′,5′-dideoxyribose.
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Hitoshi Shiku, Takeshi Saito, Ching-Chou Wu, Tomoyuki Yasukawa, Masaki ...
2006 Volume 35 Issue 2 Pages
234-235
Published: 2006
Released: January 21, 2006
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Scanning electrochemical microscopy (SECM) was employed to quantitatively characterize the oxygen permeation behaviors of poly(dimethylsiloxane) (PDMS) and surface-modified PDMS. The mass-transfer process of oxygen from the PDMS substrate to the tip electrode is diffusion limited, whereas the oxygen permeability of PDMS subjected to oxygen plasma treatment or albumin adsorption is critically restricted. Our results suggest that the oxygen permeability of PDMS is possibly affected by O
2 plasma irradiation and albumin adsorption at the PDMS surfaces.
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Sunao Miyasita, Makoto Yanaga, Isamu Satoh, Hideo Suganuma
2006 Volume 35 Issue 2 Pages
236-237
Published: 2006
Released: January 21, 2006
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The extraction of Am(III) and Eu(III) from a nitric medium by dioctylammonium dioctyldithiocarbamate (DOA·DODTC)/nitrobenzene was studied. The separation factor of Am(III)/Eu(III) shows a higher value than the highest one hitherto obtained by a cyanex/kerosene extraction. The high selectivity of a functional group of dithiocarbamate will be contributed to the investigation for the separation of Am(III) from trivalent lanthanoids.
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Naohiro Aoyama, Shu Kobayashi
2006 Volume 35 Issue 2 Pages
238-239
Published: 2006
Released: January 25, 2006
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Brønsted acid–surfactant-combined catalyst, dodecylbenzenesulfonic acid (DBSA), was used in catalytic dehydrative glycosylation reactions in water. 1-Hydroxy sugars, such as
O-benzyl-protected furanose and pyranose, reacted with alcohols and a nitrogen nucleophile in the presence of a catalytic amount of DBSA to afford the desired adducts in good yields. Detailed study of the glycosylation of 2-deoxy-
D-ribofuranose showed that hydrophobicity of the substrates was important to attain higher yields. Regarding the α/β selectivities,
D-ribose and
D-mannose derivatives gave the products in high β- and α-selectivities, respectively.
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