-
Wen-Yong Lai, Xing-Rong Zhu, Qi-Yuan He, Wei Huang
2009 Volume 38 Issue 5 Pages
392-393
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Supplementary material
Two star-shaped terfluorenes with either triphenylamine or 9-phenylcarbazole core structure with different dimensionality were synthesized. The optical, thermal, electrochemical, and electroluminescent properties were investigated in comparison with those of the low-dimensional linear counterparts. Strong correlation between the molecular dimensionality and associated optoelectronic properties was demonstrated.
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Wen Jun Zheng, Guang Tao Fei, Biao Wang, Li De Zhang
2009 Volume 38 Issue 5 Pages
394-395
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Free-standing bamboo-like Ni nanowire arrays with periodic branches have been produced by electrochemical deposition in the pores of layer-by-layer anodic alumina membrane. This method could provide a possible approach to prepare free-standing nanostructures of various functional materials with great self-support ability and large surface area in practical applications.
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Rieko Kobayashi, Jun-ichi Ozaki
2009 Volume 38 Issue 5 Pages
396-397
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Carbonization of Co–[poly(4-vinylpyridine)] (Co–PVP) complex on carbon black gave rise to oxygen reduction reaction (ORR) activity. Surface analysis revealed that the activity was caused by the introduction of nitrogen on to the surface of the carbon black but not by the presence of residual cobalt.
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Morihisa Saeki, Yuji Sasaki, Atsushi Yokoyama
2009 Volume 38 Issue 5 Pages
398-399
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A new technique for the back-extraction using photoreduction by the fourth harmonic of Nd:YAG laser has been successfully demonstrated in a liquid–liquid extraction system composed of a 1-octanol solution of Eu
3+(TODGA)
n complex and water. The reduced product, Eu
2+ ion, was stabilized by addition of 15-crown-5. The back-extraction process was investigated by laser-induced fluorescence spectroscopy. The results indicated slow diffusion of Eu
2+(15-crown-5)
m in the organic phase and fast transfer through the interface to the water.
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Norio Nakata, Suzuka Yamamoto, Wataru Hashima, Akihiko Ishii
2009 Volume 38 Issue 5 Pages
400-401
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The oxidative addition of [Pt(η
2-nb)(PPh
3)
2] with a sterically hindered thiol, TripSH (
4, Trip = 9-triptycyl) in toluene afforded
cis-hydrido(thiolato) Pt
II complex [PtH(STrip)(PPh
3)
2] (
5), as thermally and moisture-stable colorless crystals in 91% yield. Complex
5 was fully characterized by
1H,
13C{
1H}, and
31P{
1H} NMR and IR spectroscopies, and the molecular structure of
5 was determined by X-ray crystallography.
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Tomohiro Mukai, Keiko Nishikawa
2009 Volume 38 Issue 5 Pages
402-403
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Supplementary material
Bromine substitutions in the 4 and 5 positions of 1-propyl- and 1-butyl-3-methylimidazolium ions provide characteristic layer organizations in the crystals through halogen bonding and hydrogen bonding. The network structures strongly affect the alkyl-chain conformations.
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Yan Mi, Zaiyin Huang, Zeguang Zhou, Feilong Hu, Qiufeng Meng
2009 Volume 38 Issue 5 Pages
404-405
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Uniform barium molybdate nano-octahedra with a mean edge length of 50 nm have been prepared in Triton X-100 water-in-oil (w/o) microemulsions at room temperature. BaMoO
4 nano-octahedra present tetragonal single crystals. The size of these nano-octahedra can be tuned conveniently by changing the reagent concentrations and the molar ratio of water and Triton X-100.
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Xiao-Qing Yang, Li-Jun Yang, Guo-Zhu Jia
2009 Volume 38 Issue 5 Pages
406-407
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In this paper, acetone iodation was carried out and the Huang method based on experimental results was employed to calculate the effective permittivity of acetone iodation system as a function of temperature and reaction time. The coupled electromagnetic field equations, reaction kinetics equations, and heat transport equation were solved to simulate the microwave heating on chemical reaction. Here, the finite difference time domain (FDTD) method was used. Finally, the calculated results were compared with the measured results to verify this calculation. This method offers high potential applications in the explanation of some specific phenomena in the microwave heating on chemical reactions and instructs the design of microwave chemistry reactor.
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Motonori Komura, Kazuhito Watanabe, Tomokazu Iyoda, Takeshi Yamada, Hi ...
2009 Volume 38 Issue 5 Pages
408-409
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Highly ordered microphase separated films with hexagonally arranged nanocylinders yielded distinct scattering peaks even in laboratory grazing incidence small-angle X-ray scattering measurements. Hierarchical structures with perpendicularly oriented nanocylinders and parallel aligned liquid crystalline layers sustaining highly ordered nanostructures were revealed.
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Hiroshi Kominami, Shin-ichi Iwasaki, Tsuyoshi Maeda, Kazuya Imamura, K ...
2009 Volume 38 Issue 5 Pages
410-411
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Nitrobenzene was effectively and selectively reduced to aniline in an acidic aqueous suspension of titanium(IV) oxide photocatalyst in the presence of oxalic acid as a hole scavenger and the aniline yield was improved in the presence of a small amount of dioxygen.
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Shingo Saito, Atsushi Hikichi, Takao Kamura, Kazuyuki Hattori, Masakaz ...
2009 Volume 38 Issue 5 Pages
412-413
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Supplementary material
In this paper, we present the luminescent lanthanide complexes, Tb
3+– and Dy
3+–4-aminobenzyl-EDTA as receptors for monosaccharides. The monosaccharides are recognized through their coordinate bonds and hydration bonds in alkaline aqueous solution by distinctive energy-transfer luminescence enhancement of the center metal ions. The stability constants of the ternary complexes formed with several monosaccharides, which are particularly sensitive in the case of
N-acetylneuraminic acid (Neu5Ac), were measured. A high stability constant for Neu5Ac was observed with an affinity of about 5000.
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Masanobu Naito, Takuma Kawabe, Masashi Nakamura, Keiji Wakayama, Wooju ...
2009 Volume 38 Issue 5 Pages
414-415
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Supplementary material
Selective scission of the positively charged main chain of polydialkylsilane using tetrabutylammonium fluoride was utilized for facile chemical degelation of polymer-based organogel. The degelation mechanism was characterized by combinational analyses with photodiode array-equipped size exclusion chromatography, GC/MS, and FTIR measurements.
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Keiichi Terada, Katsuaki Kobayashi, Jiro Hikita, Masa-aki Haga
2009 Volume 38 Issue 5 Pages
416-417
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Supplementary material
Electric conduction properties of SAM films of Ru complexes with disulfide or phosphonate anchors have been measured by Au-nanoparticle-assisted conducting probe atomic force microscopy. The
I–
V curves of these films were nonlinear, and the resistivities depend on the headgroups and the layered structure in ways that can be explained by the contact resistance and the insulating effect of the Zn–phosphonate interlayer in metal–molecule–metal junctions. Asymmetry in these films causes a rectification effect on the
I–
V response.
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Atunobu Fujii, Yousuke Ochi, Reina Nakajima, Kimihisa Yamamoto
2009 Volume 38 Issue 5 Pages
418-419
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Supplementary material
We found that triphenylmethylium tetrafluoroborate (TPM
+BF
4−) could be coordinated to the imine group of dendritic phenylazomethine (DPA) in stepwise radial fashion, which allows for control of the number and position of TPM and metals incorporated into the dendrimers. Organic–metal hybrid assembly was also achieved.
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Takafumi Izawa, Hiroki Mori, Yusuke Shinmura, Masahito Iwatani, Eigo M ...
2009 Volume 38 Issue 5 Pages
420-421
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Supplementary material
Introduction of diarylamino substituents on 2,7-diphenyl[1]benzothieno[3,2-
b]benzothiophene (DPh-BTBT) caused morphological change in the evaporated thin-film state: from highly crystalline films with edge-on molecular orientation for DPh-BTBT to amorphous films for the diarylamino derivatives. The former was unsuitable as a hole-transporting layer in organic light-emitting diodes (OLEDs), whereas the latter acted as a superior hole-transporting layer in multilayered OLEDs.
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Wenzong Yin, Wenzhong Wang, Meng Shang, Ling Zhang, Jia Ren
2009 Volume 38 Issue 5 Pages
422-423
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Supplementary material
An ultrasound-assisted solvent substitution method was first developed to synthesize monoclinic scheelite (s-m) BiVO
4. The BiVO
4 (s-m) crystals exhibited flower-like and hierarchical dendrite morphologies and a far higher photocatalytic activity than that made by solid-state reaction for degradation of rhodamine B under visible light. This novel ultrasound-assisted solvent substitution method should be extendable to other materials.
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Xiaodong Li, Seng Kue Lee, Sungmin Kang, Masatoshi Tokita, Susumu Kawa ...
2009 Volume 38 Issue 5 Pages
424-425
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Supplementary material
New bent-shaped molecules with naphthalene central core and alkylthio tail are prepared, and their banana phase structures and properties are discussed in comparison with those of conventional alkoxy molecules.
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Hiromitsu Haba, Daiya Kaji, Yukiko Komori, Yuki Kudou, Kouji Morimoto, ...
2009 Volume 38 Issue 5 Pages
426-427
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An isotope of element 104, rutherfordium (
261Rf), produced in the
248Cm(
18O, 5
n)
261Rf reaction was successfully extracted to a chemistry laboratory using a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator GARIS. The present system is a promising interface to explore new frontiers in superheavy element chemistry.
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Takahiro Kojima, Jun-ichi Nishida, Shizuo Tokito, Yoshiro Yamashita
2009 Volume 38 Issue 5 Pages
428-429
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Supplementary material
New co-oligomers containing pyrimidine units were prepared. The planar molecular and π-stacking structures were revealed by X-ray structure analysis. The FET devices based on them showed good n-type performance.
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Yoshihiro Kon, Daisuke Imao, Takuya Nakashima, Kazuhiko Sato
2009 Volume 38 Issue 5 Pages
430-431
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Supplementary material
Palladium(II)-catalyzed chemoselective oxidation of α,β-unsaturated aldehydes with hydrogen peroxide to give α,β-unsaturated carboxylic acids was performed. Cinnamaldehyde was effectively catalyzed by palladium(II) trifluoroacetate to generate cinnamic acid in 92% yield under organic solvent-free conditions. The reaction appears to be applicable to various α,β-unsaturated aldehydes.
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Akinori Kuzuya, Yun Shi, Keita Tanaka, Kenzo Machida, Makoto Komiyama
2009 Volume 38 Issue 5 Pages
432-433
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Supplementary material
Two kinds of new acridine–DNA conjugates were synthesized by attaching acridines with bulky substituents to the end of DNA. These conjugates were hybridized to complementary RNA in combination with another unmodified DNA that hybridize to the adjacent fraction of the RNA, and were used as site-selective RNA activators for site-selective RNA cleavage catalyzed by Lu
III. The site-selective hydrolyses by these combinations are several times as fast as that achieved with the use of commercially available acridine moiety.
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Toshiki Yamaguchi, Shigeyuki Masaoka, Ken Sakai
2009 Volume 38 Issue 5 Pages
434-435
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Supplementary material
An air-stable dinuclear iron–dithiolene complex with an Fe
2(μ-S)
2 core, [Fe
III(mnt)
2]
22− (mnt = maleonitriledithiolate), has been found to serve as an electrode catalyst toward the reduction of water into molecular hydrogen with an overpotential of 560 mV. The acid form of a buffer reagent, such as CH
3CO
2H, has been found to serve as a major proton mediator during the electrocatalytic hydrogen evolution.
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Hirohiko Houjou, Misako Kokubun, Isao Yoshikawa, Koji Araki
2009 Volume 38 Issue 5 Pages
436-437
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Supplementary material
A newly discovered crystalline material showed high-contrast dichroism. The arrangement of the chromophore in the crystal fairly accounts for the angular dependence of the light absorption. This material demonstrates a new application of metal-containing supramolecular architectures to wave optics.
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Tamaki Endoh, Mizuki Kitamatsu, Masahiko Sisido, Takashi Ohtsuki
2009 Volume 38 Issue 5 Pages
438-439
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The profiling of microRNAs (miRNAs) using microarray technology has been used in many recent biological and medical studies. In this study, arrays of peptide nucleic acids (PNAs) were prepared and their miRNA capture abilities were evaluated. We found that the sensitivity of 10-mer PNA probes in targeting miRNAs was much higher than that of the corresponding DNA probes and also of longer (20-mer) DNA probes.
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Yi Han Zeng, Qing Mu, Zhi Yong Xiao, Yu Xu, M. Mukhlesur Rahman, Simon ...
2009 Volume 38 Issue 5 Pages
440-441
Published: May 05, 2009
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Supplementary material
Two new geranyl bearing polyisoprenylated benzoylphloroglucinol derivatives, hypersampsone G (
1) and hypersampsone H (
2) were isolated from the fruit of
Hypericum sampsonii. Their structures were determined on the basis of spectroscopic data and the structure of
1 was confirmed by X-ray crystallographic analysis. Antitumor activities on A549 human cancer cells of the two compounds were tested.
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Meihua Yu, Jun Zhang, Pei Yuan, Hongning Wang, Nian Liu, Yunhua Wang, ...
2009 Volume 38 Issue 5 Pages
442-443
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Supplementary material
Siliceous vesicles with controllable sizes, wall thickness, and shapes have been successfully prepared by adjusting the hydrophilic/hydrophobic ratios of mixed block copolymer templates, which provides a feasible and designable approach to fabricate vesicular structures with controllable parameters that are important for their future applications.
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Kiyotaka Onitsuka, Chiaki Kameyama, Hiroaki Sasai
2009 Volume 38 Issue 5 Pages
444-445
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Supplementary material
The reaction of cinnamyl chloride with indole in the presence of a ruthenium catalyst possessing a planar-chiral cyclopentadienyl ligand resulted in the substitution at the 3-position of the indole ring to give a branched allylation product with high regio- and enantioselectivities. The stoichiometric reaction clearly revealed that the catalytic reaction proceeded via a π-cinnamyl intermediate.
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Taichi Kimura, Motoyasu Kobayashi, Masamichi Morita, Atsushi Takahara
2009 Volume 38 Issue 5 Pages
446-447
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Supplementary material
Surface-initiated atom transfer radical polymerization (ATRP) of
tert-butyl acrylate was carried out directly from a nonmodified poly(vinylidene fluoride-
co-trifluoroethylene) [P(VDF-
co-TrFE)] film surface to give a polymer brush, which was further converted to a poly(acrylic acid sodium salt) brush by hydrolysis. A hydrophilic surface was successfully created at the outermost surface of P(VDF-
co-TrFE) film without any change in the bulk physical properties. Also the effect of surface nanotexture formation on wettability was investigated.
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Masayoshi Takeda, Eishi Tanabe, Toru Iwaki, Akihiro Yabuki, Kikuo Okuy ...
2009 Volume 38 Issue 5 Pages
448-449
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TiO
2 nanocomposite microspheres with a high concentration of around 40 mass % were successfully prepared. TiO
2 nanoparticles were well dispersed in butyl acetate by a bead mill. After adding an acrylic monomer and initiator, the suspension was heated at 80 °C for 16 h to evaporate butyl acetate and polymerize the monomer. The replacement of butyl acetate with the monomer as the dispersion medium was effective in producing a high concentration of TiO
2 nanocomposite microspheres.
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Junjiro Hayashi, Mitsumi Nishi, Mio Wanaka
2009 Volume 38 Issue 5 Pages
450-451
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CdS nanoparticles (CdS NPs) were prepared in an aqueous solution with poly(allylamine hydrochloride) (PAH) as a stabilizer. It was found that the size of CdS NPs was easily controllable with solution pH with good reproducibility. By comparing the pH dependence of CdS NPs stabilized with poly(acrylic acid) (PAA) having an opposite charge to PAH, the electrostatic interaction amongst the polyelectrolyte was believed to have a great influence on the size determination.
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Sadao Araki, Yasushi Hoshi, Satoshi Hamakawa, Susumu Hikazudani, Fujio ...
2009 Volume 38 Issue 5 Pages
452-453
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Oxygen permeable asymmetric membranes of Ca
0.8Sr
0.2Ti
0.7Fe
0.3O
3−δ were applied to a one-component membrane reactor (OCMR) for the partial oxidation of methane. CH
4 conversion and oxygen flux of OCMR with a 43-μm dense layer at 1173 K reached 71% and 1.7 mL min
−1 cm
−2, respectively. These values are 2.5 times greater than that of a 500-μm self-supported membrane.
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Ping-Jyun Sung, Gung-Ying Li, Yu-Pei Chen, I-Chu Huang, Bo-Yuan Chen, ...
2009 Volume 38 Issue 5 Pages
454-455
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A novel chlorinated briarane, fragilide E (
1), which possesses an unprecedented 20-acetoxy group, was isolated from the gorgonian coral
Junceella fragilis. The structure of
1 was elucidated by spectroscopic methods.
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Kentaro Okamoto, Norio Hamada, Toshiaki Sumi, Taka-aki Okamura, Norika ...
2009 Volume 38 Issue 5 Pages
456-457
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Supplementary material
A PYP active-center model compound containing a hydrogen bond to the conjugated carbonyl oxygen was synthesized and its effect on the electronic properties of the chromophore were investigated. The intramolecular hydrogen bond induces significant change in the absorption maximum of the π–π
* transition in the chromophore.
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Tomonari Tanaka, Takeshi Matsumoto, Masato Noguchi, Atsushi Kobayashi, ...
2009 Volume 38 Issue 5 Pages
458-459
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Supplementary material
Aryl 1-thioglycosides have directly been synthesized in good yields from the corresponding unprotected sugars and thiols without protection of the hydroxy groups by using 2-chloro-1,3-dimethylimidazolinium chloride (DMC) as dehydrative condensing agent. The reaction proceeded in a mixed solvent of water and acetonitrile under mild reaction conditions, leading to the predominant formation of β-anomers.
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Yutaka Ie, Makoto Okabe, Yoshikazu Umemoto, Hirokazu Tada, Yoshio Aso
2009 Volume 38 Issue 5 Pages
460-461
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Supplementary material
Solution-processable electronegative oligothiophenes bearing difluorodioxocyclopentene-annelated thiophenes have been synthesized. The electronic properties of the oligomers were investigated by absorption spectroscopy and electrochemical measurements. Their films fabricated by spin-coating showed typical n-channel OFET behavior.
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Junichi Imoto, Akinori Sato, Hideki Yorimitsu, Koichiro Oshima
2009 Volume 38 Issue 5 Pages
462-463
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Atom-transfer radical addition of α-iodo esters to 1-alkynyl sulfides is described. The products, 2-alkoxycarbonylmethyl-1-iodo-1-alkenyl sulfides, can be converted into γ-keto esters.
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Yasuhiro Domi, Katsuaki Shimazu, Marc D. Porter
2009 Volume 38 Issue 5 Pages
464-465
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The oxidation of ferrocene on a defect-free mixed per-6-thio-β-cyclodextrin/pentanethiol monolayer in a NaClO
4 solution was inhibited in the presence of sulfate. The peak current in differential pulse voltammograms linearly decreased with the logarithm of the sulfate concentration in an extremely wide range from 1 nM to 1 mM, showing the possible application as an electrochemical sensor of sulfate.
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Xiaojun Zhang, Aixia Gu, Guangfeng Wang, Wen Wang, Huaqiang Wu, Bin Fa ...
2009 Volume 38 Issue 5 Pages
466-467
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Supplementary material
CuO nanoflowers made up of nanobelts (CuO NFNBs) were successfully prepared in one step by a simple and reliable seed-mediated route, employing only Cu(NO
3)
2 and NH
3·H
2O as the starting materials. The as-prepared sample was characterized by XRD, FESEM, and TEM techniques. The growth mechanism of these nanostructures is discussed. A glassy carbon electrode modified with CuO NFNBs was then used to detect hydrazine. The results show that the CuO NFNBs show a very high activity for detecting hydrazine.
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Hisashi Shimakoshi, Emiko Sakumori, Kenji Kaneko, Yoshio Hisaeda
2009 Volume 38 Issue 5 Pages
468-469
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Supplementary material
A cobalamin derivative, cobyrinic acid, was effectively immobilized on TiO
2, and the hybrid TiO
2 was characterized by UV–vis, XPS, MALDI-TOFMS as well as TEM analysis. The hybrid TiO
2 exhibits high reactivity for dehalogenation of various organic halides such as phenethyl bromide, benzyl bromide, and 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane (DDT) under irradiation with UV light at room temperature.
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Zhu Hong Qin, Hua Wen Zhao, Cheng Zhi Huang, Li Ping Wu
2009 Volume 38 Issue 5 Pages
470-471
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Supplementary material
In the presence of melamine (2,4,6-triamino-
s-triazine), citrate-capped gold nanoparticles (Au-NPs) can self-assemble and form a network structure through electrostatic interactions. A new absorption peak appears at approximately 700 nm, and the intensity is proportional to the concentration of melamine. Thus, a new simple method of detecting melamine is developed.
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Yu Jiang Wang, Kai Chen, Li Ming Tang
2009 Volume 38 Issue 5 Pages
472-473
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Supplementary material
A new kind of hydrogelator based on a
p-hydroxypyridinium salt of 1,2,4-benzenetricarboxylic acid formed standard hydrogel at higher concentration, while self-assembled to globular structures at lower concentration, which could be explained by nucleation-controlled processes.
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Junwei Zhao, Jiangping Liu, Jingping Wang, Jingyang Niu
2009 Volume 38 Issue 5 Pages
474-475
Published: May 05, 2009
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Supplementary material
A novel two-dimensional inorganic–organic composite solid material of iron(III) molybdate [enH
2][Fe
2(MoO
4)
4] (
1) (en = ethylenediamine) has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectra, and X-ray diffraction analysis. The sheet structure is constructed by binuclear {FeO
6} octahedra and bridging {MoO
4} tetrahedra. The two iron octahedra are edge-shared, and all of the oxygen atoms in iron coordination spheres are provided from the {MoO
4} tetrahedral units which interconnect the diiron core through the corner sharing, leading to a novel two-dimensional framework.
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Takahiro Kozawa, Ayumu Onda, Kazumichi Yanagisawa
2009 Volume 38 Issue 5 Pages
476-477
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Supplementary material
β-Ca
2SiO
4 powders were prepared from commercially available raw materials, CaCO
3 and amorphous SiO
2 (
a-SiO
2), by solid-state reactions in water vapor atmosphere. The formation of β-Ca
2SiO
4 was accelerated by water vapor. Water vapor is considered to enhance the thermal decomposition of CaCO
3 and to attack surface Si–O–Si bonds in
a-SiO
2 to accelerate the formation of β-Ca
2SiO
4. The effect of water vapor atmosphere on the formation of β-Ca
2SiO
4 from a mixture of CaCO
3 and
a-SiO
2 was stronger than that of mechanochemical processing for 30 min.
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Masaharu Tsuji, Daisuke Ueyama, Md. Jahangir Alam, Sachie Hikino
2009 Volume 38 Issue 5 Pages
478-479
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Supplementary material
Gold nanocrystals were prepared by a microwave (MW)–polyol method using di-, tetra-, and poly(ethylene glycol)s. When these polyols were heated to 240 °C at a heating rate of 160 °C/min and held at 240 °C for 5 min, icosahedral particles with average diameters of 55–85 nm were prepared from HAuCl
4/PVP in di-, tetra- and poly(ethylene glycol)s at high yield (≥91%). Plate-like and decahedral particles were obtained at high yields from HAuCl
4/PVP/NaCl.
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Keizo Nakagawa, Yusuke Tanimoto, Ken-Ichiro Sotowa, Shigeru Sugiyama, ...
2009 Volume 38 Issue 5 Pages
480-481
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Pt catalysts covered with an organosilica layer containing phenyl and/or methyl groups showed higher conversion in the dehydrogenation of cyclohexane, compared with Pt catalysts covered with a silica layer containing no functional groups. Micropores formed in the organosilica layer owing to the decomposition of functional groups by heat treatment resulted in this increase in catalytic activity which is dependent on the functional groups contained in the organosilica layer.
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Teruki Sugiyama, Takuji Adachi, Hiroshi Masuhara
2009 Volume 38 Issue 5 Pages
482-483
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Crystal growth of glycine was accelerated just by focusing a CW 1064-nm laser beam at a position adjacent to a spontaneously generated glycine crystal in D
2O. Its rate depended on the distance between the crystal and the focal spot. Interesting crystal growth and dissolution were found, which is considered to be due to Ostwald ripening.
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Shyamaprosad Goswami, Anita Hazra
2009 Volume 38 Issue 5 Pages
484-485
Published: May 05, 2009
Released on J-STAGE: April 18, 2009
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One-step direct conversion of a series of heterocyclic aldehydes to heterocyclic esters is reported here by the use of thiamine hydrochloride as a catalyst in the absence of nitrogen atmosphere in a reasonably high yield. This method exclusively produces heterocyclic esters in most cases (specially with more electron-withdrawing heterocyclic aldehydes) without the formation of side products like heteroin. Thus the method developed looks promising and general for the synthesis of electron-withdrawing heterocyclic esters from the corresponding aldehydes.
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Aiichiro Nagaki, Eiji Takizawa, Jun-ichi Yoshida
2009 Volume 38 Issue 5 Pages
486-487
Published: May 05, 2009
Released on J-STAGE: April 18, 2009
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Supplementary material
α-Triphenylsilyloxiranyllithium was effectively generated by the reaction of epoxyethyltriphenylsilane with
n-BuLi in a microflow reactor at 0 °C, though it is well known that an over reaction cannot be avoided even at lower temperatures in a conventional macrobatch reactor. Subsequent reactions with various electrophiles in the microflow reactor gave the corresponding α-substituted epoxysilanes.
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Naoyuki Shimada, Seiichi Nakamura, Masahiro Anada, Motoo Shiro, Shunic ...
2009 Volume 38 Issue 5 Pages
488-489
Published: May 05, 2009
Released on J-STAGE: April 18, 2009
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Supplementary material
Dirhodium(II) tetrakis[
N-tetrafluorophthaloyl-(
S)-
tert-leucinate], Rh
2(
S-TFPTTL)
4, is an exceptionally efficient catalyst for enantioselective tandem cyclic oxonium ylide formation and [2,3]-sigmatropic rearrangement from α-diazo-β-ketoester bearing cyclic allylic acetal functionality, providing the 2,8-dioxabicyclo[3.2.1]octane core structure of zaragozic acids in up to 93% ee.
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