-
Guoqing Guan, Katsuki Kusakabe, Nozomi Sakurai, Kimiko Moriyama
2007 Volume 36 Issue 12 Pages
1408-1409
Published: December 05, 2007
Released on J-STAGE: October 27, 2007
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Supplementary material
Vegetable oil such as corn, sunflower, rapeseed, soybean, and palm oil was completely transesterified into biodiesel fuel at short time because of high mass-transfer rate in the homogeneous solution formed by adding environmental-friendly solvent of dimethyl ether (DME).
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Masatsugu Taneda, Yoshinori Kodama, Yusaku Eda, Hiroyuki Koyama, Toshi ...
2007 Volume 36 Issue 12 Pages
1410-1411
Published: December 05, 2007
Released on J-STAGE: October 27, 2007
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Supplementary material
Photochromic behavior of 2-(2-hydroxyphenyl)benzothiazole derivatives, whose photoinduced deformation was restricted by the cyclic structure, was first observed to suggest the existence of a
cis-keto form as a certain structure for the photochrome of
N-salicylideneanilines in the crystal state.
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Nigel Ribeiro, Jin Maeda, Yasuhiro Ishida, Yuka Kobayashi, Kazuhiko Sa ...
2007 Volume 36 Issue 12 Pages
1412-1413
Published: December 05, 2007
Released on J-STAGE: October 27, 2007
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The reaction of
O,
O′-dimethyl chlorothiophosphate with aryllithiums took place easily to afford the corresponding methylated aryl compounds in place of expected
O,
O′-dimethyl aryl(thiophosphonate)s.
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Yuki Sano, Takanori Tanaka, Masahiko Hayashi
2007 Volume 36 Issue 12 Pages
1414-1415
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
A variety of benzylic alcohols were oxidized to the corresponding carbonyl compounds selectively in the presence of activated carbon under molecular oxygen atmosphere. This process does not require any metal oxides, thus this is environmentally friendly and economical.
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Ken-ichi Ishizu, Fumitaka Hayashi, Masakazu Iwamoto
2007 Volume 36 Issue 12 Pages
1416-1417
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
The nitridation of mesoporous silica MCM-41 with ammonia was carried out by using a plug flow-type reactor. The degree of nitridation was dependent on the amount of NH
3 supplied. Mesoporous silicon oxynitride containing 34 wt % of nitrogen could be prepared at 1273 K for 8 h, and the hexagonal mesoporous structure was maintained.
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Bunpei Hatano, Keita Nagahashi, Shigeki Habaue
2007 Volume 36 Issue 12 Pages
1418-1419
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
The treatment of aromatic acetals with zinc and chlorosilane in the presence of potassium carbonate in toluene brought about facile and effective reductive coupling to give the corresponding coupling products.
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Kazushi Mashima, Ryuji Ohnishi, Tsuneaki Yamagata, Hayato Tsurugi
2007 Volume 36 Issue 12 Pages
1420-1421
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
Reactions of M(CH
2Ph)
4 (M = Zr and Hf) with α-diimine ligands
1 at −78 °C selectively afford tribenzyl amido–imino complexes of zirconium
4 and hafnium
5, whose treatment with B(C
6F
5)
3 gave the corresponding cationic dibenzyl complexes
6 and
7 capable of polymerizing 1-hexene.
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Yoichiro Kuninobu, Yuichi Inoue, Kazuhiko Takai
2007 Volume 36 Issue 12 Pages
1422-1423
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
2,4-Disubstituted quinoline derivatives were obtained from
N-aryl-2-propynylamines catalyzed by copper(I) and gold(I) complexes. The quinoline derivatives could also be obtained by the reaction of
N-arylaldimines with terminal acetylenes via the formation of
N-aryl-2-propynylamines.
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Keitaro Umezawa, Daniel Citterio, Koji Suzuki
2007 Volume 36 Issue 12 Pages
1424-1425
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
We report a newly synthesized squaraine-based fluorescent dye (
KSQ-2) with excellent and useful optical characteristics such as a sharp near-infrared (NIR) emission at 751 nm, an extremely high fluorescence quantum yield (φ=0.56 in cyclohexane), and linear positive solvatochromic properties in the spectral region around 780 nm.
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Shinya Aikawa, Takio Kizu, Eiichi Nishikawa, Toshihide Kioka
2007 Volume 36 Issue 12 Pages
1426-1427
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Carbon nanomaterials such as carbon nanotubes (CNTs) and carbon nanospheres (CNS) were synthesized from sucrose solution using an arc discharge method without graphite electrodes. In this process, the nanocarbon products were formed from carbon atoms supplied by the sucrose in solution rather than from the graphite of the electrodes. One of the advantages of this method is that the nanomaterials are produced in agglomerated forms, and there are no generated toxic gases during arcing process.
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Kazutsugu Matsumoto, Yoichi Kawabata, Satoshi Okada, Jun Takahashi, Ke ...
2007 Volume 36 Issue 12 Pages
1428-1429
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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A new route to the optically active allyl alcohols by microbial oxidation is disclosed.
Yamadazyma farinosa IFO 10896, a yeast, efficiently catalyzes the enantioselective oxidation of allyl alcohols to afford the corresponding optically active alcohols as the remaining substrates. This reaction is applicable to both cyclic and acyclic compounds.
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Kunio Saruta, Tsuyoshi Ogiku
2007 Volume 36 Issue 12 Pages
1430-1431
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
A novel synthesis of 1,4-diazabicyclo[3,3,1]octan-3-one derivatives using a traceless-solid-phase approach is described, in which many kinds of 1,4-diazabicyclo[3,3,1]octan-3-one derivatives have been efficiently obtained in high purity, based on an intramolecular alkylation of tertiary amines followed by an elimination of desired tertiary amines from the generated quarternary ammonium salts.
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Jeongju Moon, Hyungoog Nam, Jinhun Ju, Miso Jeong, Sunwoo Lee
2007 Volume 36 Issue 12 Pages
1432-1433
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
The palladium-catalyzed homocoupling of aryl halides was carried out using phosphite ligands. The optimized reaction conditions were Pd
2(dba)
3, phosphite
1, and NaO
t-Bu in diglyme, and the desired homocoupling products were afforded in moderate to good yields.
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Hideo Enozawa, Youhei Honna, Masahiko Iyoda
2007 Volume 36 Issue 12 Pages
1434-1435
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
TTF-carboxylic acid
2 exhibits gelling ability for hexane and cyclohexane to form an orange fibrous material and shows solvatochromism both in solution and in the fiber formation to produce a reddish-purple fibrous material from acetonitrile. Moreover, the corresponding ester
1 forms yellow fibers from acetonitrile. However, the tetrabutylammonium salt
3 produces fine microcrystals without gel or fiber formation.
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Yuan Gui, Sheng Shen, Hai-Yang Wang, Zhi-Yi Li, Zhi-Zhen Huang
2007 Volume 36 Issue 12 Pages
1436-1437
Published: December 05, 2007
Released on J-STAGE: November 03, 2007
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Supplementary material
A
C2-symmetric sulfide
6 has been synthesized from cheap
L-tartaric acid. It was found that sulfide
6 could perform a tandem reaction with benzyl bromide and tosyl imines to give (2
S,3
S)-aziridines
9a–
9g with good to excellent enantioseletivities (up to 96% ee).
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Torahiko Yamaguchi, Yohsuke Yamamoto
2007 Volume 36 Issue 12 Pages
1438-1439
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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In order to obtain a pentacoordinate hypervalent carbon compound with two strong apical bonds, a new compound bearing the novel skeleton
4 was synthesized by the two-electron oxidation of
9 followed by deprotonation. The X-ray diffraction data and the NMR spectra showed that the structure of
4 is not pentacoordinate, but tetracoordinate.
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Tomokazu Fukutsuka, Shin-ichi Miyano, Yoshiaki Matsuo, Yosohiro Sugie
2007 Volume 36 Issue 12 Pages
1440-1441
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Surface modification of a carbon-coated stainless steel (SUS304) was carried out by nitrogen trifluoride (NF
3) plasma irradiation. NF
3 plasma irradiation changed the surface wettability of the carbon-coated SUS304 from hydrophobic to hydrophilic.
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Takashi Nishikata, Yasunori Yamamoto, Norio Miyaura
2007 Volume 36 Issue 12 Pages
1442-1443
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Palladium-catalyzed 1,4-addition of arylboronic acids to unsaturated carbonyl compounds has been limitedly used for ketone and aldehyde derivatives. It was found that reaction with
N-acylamides exceptionally proceeds with high yields and high enantioselectivities. A dicationic palladium–chiraphos catalyst
3 gave optically active β-arylamides of up to 98% ee.
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Keitaro Yoshimoto, Shinya Matsumoto, Ryosuke Asakawa, Katsumi Uchida, ...
2007 Volume 36 Issue 12 Pages
1444-1445
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
Single-stranded DNA (ssDNA) immobilization in a highly oriented manner with controlled ssDNA density on a gold surface was accomplished by surface modification with our original poly(ethylene glycol) (PEG)-
block-oligoamine copolymer, followed by immobilization of thiol-ended ssDNA (ssDNA-SH) on the PEG tethered chain surface. As the length of the polyamine segment in the block copolymer increased, the immobilization amount of ssDNA-SH on the gold surface increased. The constructed surface improved the signal of the hybridization of ssDNA-SH with its target ssDNA, as found by surface plasmon resonance (SPR) measurements.
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Qiu Liao, Jing Sun, Lian Gao
2007 Volume 36 Issue 12 Pages
1446-1447
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
An effective process via Fenton reaction combined with acid treatment was firstly used to cut carbon nanotubes (CNTs) into shorter ones.
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Mahito Atobe, Shinya Iizuka, Toshio Fuchigami, Hikaru Yamamoto
2007 Volume 36 Issue 12 Pages
1448-1449
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
The electrochemical coating and filling with conjugated polymers in porous templates were carried out in supercritical fluids. The use of the special properties of the fluids such as higher diffusivity and lower viscosity enabled the effective monomer transport into the porous template and the nanoprecise coating and filling with the polymers.
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Zhen Zhang, Yong Ju, Yufen Zhao
2007 Volume 36 Issue 12 Pages
1450-1451
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
Six new 1,2,3-triazole-containing bile acid dimers, involving head-to-tail, head-to-head, and tail-to-tail three types of steroidal derivatives, have been synthesized via Cu
I-catalyzed 1,3-dipolar cycloaddition reaction “click chemistry” in high yields. The inverse micellar properties of these compounds were also investigated through hydrophilic dye solubilization studies in nonpolar media.
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Kazuya Yabe, Yuji Maruno, Masaaki Towatari, Takefumi Hamamatsu, Naohid ...
2007 Volume 36 Issue 12 Pages
1452-1453
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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A 3d–4f complex with the formula of {Na[(CuL)
4Gd]}
1∞ was prepared, where (CuL)
− is a “ligand-complex,” [
N-(4-methyl-6-oxo-3-azahept-4-enyl)oxamato]copper(II). The structure consists of a pin-wheel-like Cu
4Gd core and Na
+ ion as a connector to give a one-dimensional chain. The magnetic data and their analyses demonstrated an intramolecular ferromagnetic interaction within a Cu
4Gd core and an intercore antiferromagnetic interaction operating through Na
+ ion with the coupling parameters of
J=+1.09 cm
−1,
zJ′=−0.07 cm
−1;
SCu=1⁄2,
SGd=7⁄2).
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Jun Liu, Guangming Chen, Jiping Yang, Yongmei Ma
2007 Volume 36 Issue 12 Pages
1454-1455
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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A poly(vinyl chloride)/layered double hydroxide (PVC/LDH) nanocomposite was successfully prepared via solution intercalation for the first time. Its microstructure was characterized by XRD, TEM, TGA, and IR, which clearly demonstrates that LDH particles were exfoliated into nanometer scale and homogeneously dispersed in the PVC matrix.
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Setsuo Funasaka, Koji Kato, Teruaki Mukaiyama
2007 Volume 36 Issue 12 Pages
1456-1457
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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A highly efficient method by using benzenesulfonic anhydride (BSA) in the presence of 4-(dimethylamino)pyridine (DMAP) to synthesize carboxamides from various carboxylic acids and amines including sterically hindered ones is established. This reaction proceeds smoothly to provide the desired product in high yield.
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Pengfei Zhang, Hongjing Dou, Wanwan Li, Ke Tao, Bin Xing, Kang Sun
2007 Volume 36 Issue 12 Pages
1458-1459
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Here, we present a strategy to fabricate multifunctional polystyrene (PS) microbeads with carboxyl ends which exhibit magnetism and fluorescence. The strategy includes two steps: the preparation of porous PS microbeads with carboxyl-ends by combination of dispersion polymerization and seeded polymerization, and the facile process of embedding quantum dots (QDs) and magnetic nanoparticles (MNPs) into microbeads. The results indicate that the multifunctional PS microbeads (MFMs) can be dispersed in water stably and are well suitable for target encoding, capturing, and enrichment.
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Abul K. Mallik, M. Mizanur Rahman, Miklós Czaun, Makoto Takafuj ...
2007 Volume 36 Issue 12 Pages
1460-1461
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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We have previously reported that poly(octadecyl acrylate) as an organic stationary phase in HPLC shows high molecular-shape selectivity through carbonyl–π interaction on highly ordered structures of long alkyl chains. In this communication, a new “grafting-from” strategy based on surface-initiated atom-transfer radical polymerization is applied for ordering of poly(octadecyl acrylate) on silica to lead to remarkable selectivity increase.
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Lan Yang, Lie Yin, Yingchao Zhang, Yanluo Lu, Feng Li
2007 Volume 36 Issue 12 Pages
1462-1463
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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A magnesium ferrite film has successfully been fabricated by sintering a single-source Mg–Fe
II–Fe
III layered double hydroxide (LDH) precursor at 900 °C. It is shown that the obtained ferrite film exhibits a promising superparamagnetic behavior.
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Yoshihide Tsunobuchi, Kazuhito Hashimoto, Motoo Shiro, Toshiya Hozumi, ...
2007 Volume 36 Issue 12 Pages
1464-1465
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
Two types of molecule-based magnets Cu
II3[W
V(CN)
8]
2(pyrimidine)
2·2-propanol·6H
2O (
1) and Cu
II3[W
V(CN)
8]
2(pyrimidine)
2·1-butanol·5H
2O (
2) are prepared. These compounds have a 3-dimensional porous structure, in which a noncoordinated 2-propanol or 1-butanol molecule is penetrated. These compounds show long-range magnetic ordering with Curie temperatures of 8.2 K (
1) and 8.4 K (
2) although large organic molecules are packed.
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Kazuaki Tomono, Kazuo Miyamura
2007 Volume 36 Issue 12 Pages
1466-1467
Published: December 05, 2007
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The trigonellinium cations in the partially oxidized Ni(dmit)
2 complex salt
1 formed strong O–H···O hydrogen-bridged dimers, and the dimers are held together by the weak C(sp
2 and sp
3)–H···O hydrogen bond to form 1D strands. Further assembly through weak C(sp
3)–H···O hydrogen bond and π···π interaction resulted in the formation of Ni(dmit)
2 column structure.
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Bunsho Kure, Shunichi Fukuzumi, Seiji Ogo
2007 Volume 36 Issue 12 Pages
1468-1469
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
A new water-soluble and acid-stable dinuclear organoiridium(III) dinitrate complex [{Cp
∗Ir(NO
3)}
2(μ-Cl)
2] (
1, Cp
∗ = η
5-C
5Me
5) was synthesized by the reaction of a water-insoluble organoiridium(III) complex [(Cp
∗IrCl)
2(μ-Cl)
2] (
2) with two equivalents of AgBF
4 in aqueous nitric acid (1 M HNO
3/H
2O) at 23 °C for 12 h. The structure of
1 with two monodentate NO
3− ligands is discussed in comparison with structure of a mononuclear organoiridium(III) complex with one monodentate and one bidentate NO
3− ligands, [Cp
∗Ir(NO
3)
2] (
3).
View full abstract
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Yanyong Liu, Toshiaki Hanaoka, Kazuhisa Murata, Kiyomi Okabe, Megumu I ...
2007 Volume 36 Issue 12 Pages
1470-1471
Published: December 05, 2007
Released on J-STAGE: November 10, 2007
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Supplementary material
Bifunctional catalysts containing Pt and polyoxocation-pillared montmorillonite showed high yields of diesel-range hydrocarbons (>70%) in the hydrocracking of Fischer–Tropsch wax due to their weak acid strength, high thermal stability, large surface area, and large pore size.
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J. S. Yadav, B. V. Subba Reddy, T. Srinivasa Rao, B. Bala. M. Krishna, ...
2007 Volume 36 Issue 12 Pages
1472-1473
Published: December 05, 2007
Released on J-STAGE: November 17, 2007
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Supplementary material
Direct substitution of the hydroxy group in 2-propynyl alcohols with sulfonamides has been achieved using 5 mol % of phosphomolybdic acid supported on silica gel (PMA/SiO
2) under mild reaction conditions to produce 2-propynyl amides in excellent yields and with high selectivity.
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J. S. Yadav, B. V. Subba Reddy, A. Raju, K. Ravindar, Gakul Baishya
2007 Volume 36 Issue 12 Pages
1474-1475
Published: December 05, 2007
Released on J-STAGE: November 17, 2007
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Supplementary material
Indium(III) bromide is found to catalyze efficiently the hydrothiolation of unactivated alkynes with various thiols under mild conditions to produce the corresponding dithioacetals in excellent yields. However, addition of aromatic thiols on aromatic alkynes gave the β-vinyl sulfides in high yields. This new procedure offers significant advantages such as high conversions, short reaction times, and simplicity in operation.
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Nami Sugiyama, Ryoko Kunibu, Masahiro Yoshizawa-Fujita, Yuko Takeoka, ...
2007 Volume 36 Issue 12 Pages
1476-1477
Published: December 05, 2007
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Supplementary material
Poly(
L-lactide) (PLLA) has been synthesized by ring-opening bulk polymerization of
L-lactide in porous hydroxyapatite (HAp) matrix without any additional catalyst, and this hybridizing process directly provided artificial bone materials. The obtained PLLA/HAp composites had enough mechanical properties with a bending strength of 53.7 MPa, which was 2.3 times stronger than porous HAp, and showed excellent biocompatibility for clinical applications.
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Arndt W. Schmidt, Joghee R. Suresh, Gabriele Theumer, Hans-Joachim Kn& ...
2007 Volume 36 Issue 12 Pages
1478-1479
Published: December 05, 2007
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We report a synthetic approach to the sex pheromone of the female oleander scale
Aspidiotus nerii using our Lewis acid promoted [2 + 2] cycloaddition of allylsilanes in combination with the modified Fleming–Tamao oxidation.
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Teruki Sugiyama, Takuji Adachi, Hiroshi Masuhara
2007 Volume 36 Issue 12 Pages
1480-1481
Published: December 05, 2007
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An intense CW-YVO
4 laser beam of 1064 nm was focused into a supersaturated D
2O solution of glycine, leading to its crystallization. At the focal point on an air–solution interface, a small single glycine crystal was trapped and grew quickly. The crystallization mechanism is considered in view of gathering and organization of large solute clusters of glycine by photon pressure.
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Kohsuke Aikawa, Isao Kaito, Koichi Mikami
2007 Volume 36 Issue 12 Pages
1482-1483
Published: December 05, 2007
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Supplementary material
A variety of planar chiral Ru-complexes bearing
tropos ortho-substituted biphenyl ligands were synthesized. The planar chirality control of the Ru complexes by enantiopure (
R)-H
8–DABN selectively gave the thermodynamically stable diastereomers via association of solvents employed.
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Yoshitaka Shimizu, Yoko Ohte, Yasuhisa Yamamura, Kazuya Saito
2007 Volume 36 Issue 12 Pages
1484-1485
Published: December 05, 2007
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Heat capacity of [C
4mim][Tf
2N] (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) was measured by adiabatic calorimetry. Broad heat capacity anomaly and change in spontaneous endothermic effect were observed for crystal phase. The relation between these anomalies and thermal history after crystallization is described.
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Toshiyuki Moriuchi, Kenta Ishino, Toshikazu Hirao
2007 Volume 36 Issue 12 Pages
1486-1487
Published: December 05, 2007
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Supplementary material
Structural characterization of (arylimido)vanadium(V) compounds was demonstrated to elucidate the ligand effect on the nature of the imido bonds. In the case of the triisopropoxide ligand, the nitrogen of the imido bond is suggested to possess an sp-hybridized character although the participation of an sp
2-hybridized character is indicated with the imido nitrogen derived from the triethanolaminate ligand.
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Yasuhiro Nishiyama, Takehiko Wada, Tadashi Mori, Yoshihisa Inoue
2007 Volume 36 Issue 12 Pages
1488-1489
Published: December 05, 2007
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Supplementary material
The enantiomeric excess of photoadduct obtained in the title reaction was critically manipulated not only by pressure (
P) but also by temperature (
T), exhibiting substantially different
P-dependence profiles at different
T, yet sharing a sudden leap near the critical density at each
T, for which the difference in clustering property of methanol in near and supercritical CO
2 is thought to be responsible.
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Tomoyuki Kimura, Satomi Kuribayashi, Tetsuya Sengoku, Keita Matsui, Sh ...
2007 Volume 36 Issue 12 Pages
1490-1491
Published: December 05, 2007
Released on J-STAGE: November 17, 2007
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Mycalolide B, a cytotoxic macrolide isolated from a marine sponge of the genus
Mycale, has an actin depolymerizing activity. This paper reports the synthesis of C7–C35 fragment of mycalolides via cross olefin metathesis reaction between trisoxazole fragment and side-chain fragment.
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Yun-Hua Wang, Fu-Yu Tsai
2007 Volume 36 Issue 12 Pages
1492-1493
Published: December 05, 2007
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A [Rh(cod)Cl]
2 and cationic bipyridyl ligand system was found to be an efficient catalyst for the polymerization of phenylacetylenes in water under aerobic conditions at room temperature. Poly(phenylacetylene) was obtained in high yield with high molecular weight and cis content, and the reused aqueous phase showed activity for recycle run. Mono-substituted phenylacetylenes could also be polymerized by this system in the presence of KOH.
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Hiromi Nakai, Naoto Chatani
2007 Volume 36 Issue 12 Pages
1494-1495
Published: December 05, 2007
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2H- and
13C-labelling studies on skeletal reorganization of 1,6-enynes having a terminal alkyne moiety have been performed with various catalysts. The products are 1-vinylcyclopentenes, but two possible isomers, type
I and
II products, can be formed. The formation of type
I involves the cleavage of the original C–C double bonds and migration of the terminal alkene carbon atom to the terminus of the alkyne. On the other hand, the formation of type
II involves a double cleavage of the C–C double bond and the C–C triple bond, which is an anomalous bond connection. The product ratio is affected by the nature of the catalyst used. Type
II is obtained as a major isomer in the case of late transition metal halides. On the other hand, the type
I product forms exclusively in the presence of a typical element halide, such as InCl
3.
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Yun Hee Jang, Sungu Hwang, Doo Soo Chung
2007 Volume 36 Issue 12 Pages
1496-1497
Published: December 05, 2007
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The intrinsic proton affinities of individual basic sites, so-called micro acid dissociation constants, of purine nucleobases in aqueous solution are calculated using an ab initio quantum-mechanical method in combination with the Poisson–Boltzmann continuum solvation model. Calculated micro acid dissociation constants as well as macro acid dissociation constants (p
Ka) agree with recent experimental measurements mostly within a pH unit.
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Xiaoyan Zhang, Huiqin Chen, Mingbo Zheng, Jinsong Liu, Jieming Cao
2007 Volume 36 Issue 12 Pages
1498-1499
Published: December 05, 2007
Released on J-STAGE: November 21, 2007
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Supplementary material
A novel hexagonal fluorinated aluminophosphate molecular sieve has been prepared ionothermally using 1-ethyl-3-methylimidazolium bromide as solvent and template provider in the presence of HF. The resulting fluorinated aluminophosphate molecular sieve is hexagonal nanoflakes with a thickness of about 170 nm and has the single-crystal property. Further comparative experiments show that fluoride ions have a strong effect on the morphology and framework of the samples.
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J. S. Yadav, B. V. Subba Reddy, A. Srinivas Reddy, B. Eeshwaraiah
2007 Volume 36 Issue 12 Pages
1500-1501
Published: December 05, 2007
Released on J-STAGE: November 21, 2007
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Benzyl acetates undergo smooth deoxygenative allylation with allyltrimethylsilane in the presence of 10 mol % of molecular iodine under mild conditions to afford the corresponding allyl derivatives in excellent yields and with high selectivity. Cinnamyl alcohols also react readily with allylsilane under similar conditions. The use of molecular iodine makes this method quite simple, more convenient and cost effective.
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Chichao Yu, Jianlin Shi, Dongsheng Yan
2007 Volume 36 Issue 12 Pages
1502-1503
Published: December 05, 2007
Released on J-STAGE: November 21, 2007
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A facile and novel method has been developed for synthesizing nanoporous Mn
2O
3 materials with polyhedron morphology, high surface area, and narrow pore distribution by controlled thermal decomposition of the oxalate salt precursor. This method can be extended to the preparation of other kinds of nanoporous oxides.
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Ji Woong Yoon, Sung Hwa Jhung, Dae Hyun Choo, Seung Jun Lee, Jong-San ...
2007 Volume 36 Issue 12 Pages
1504-1505
Published: December 05, 2007
Released on J-STAGE: November 21, 2007
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Supplementary material
Oligomerization of isobutene has been investigated using FeCl
3-modified HY zeolite catalysts in order to produce triisobutenes or remove/separate isobutene from C
4 streams. Stable isobutene conversion and high selectivity for trimers are attained over the modified zeolite with high concentration of Lewis acid sites, suggesting that a potential trimerization catalyst can be obtained easily by loading a Lewis acid into an acidic zeolite catalyst.
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