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Vol. 81, No. 7 (July, 2008)
[PDF version]
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July 10, 2008
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785-795
Discovery and Application of Asymmetric Reaction by Multi-Functional Thioureas
H. Miyabe and Y. Takemoto*
[Full Text PDF(J-STAGE)] Free Access Article
Bifunctional thiourea catalysts were designed and synthesized. Catalyst having an amino group accelerated several nucleophilic additions of active methylene compounds and catalyst having a chelating functionality provided sufficient activation of organoboronic acids to facilitate the Petasis transformation of quinolines.
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July 10, 2008
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796-819
Synthesis of Rubrivivax gelatinosus Lipid A and Analogues for Investigation of the Structural Basis for Immunostimulating and Inhibitory Activities
Y. Fukase, Y. Fujimoto,* Y. Adachi, Y. Suda, S. Kusumoto, and K. Fukase*
[Full Text PDF(J-STAGE)] Free Access Article
To elucidate the structural requirements for immunologically active lipid A derivatives, we synthesized Rubrivivax gelatinosus lipid A and its new analogues focusing on the effects of acyl moieties and acidic groups at 1-position, with an affinity separation method.
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July 10, 2008
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820-825
Geometrical and Kinetic Isotope Effects on R–H(D)…R Type Intramolecular Hydrogen Bonds (R = CH2, NH, and O) Using a Multi-Component Molecular Orbital Method
Y. Kikuta, T. Ishimoto, and U. Nagashima*
[Full Text PDF(J-STAGE)]
We analyzed the geometrical and kinetic isotope effect for R–H(D)…R type proton (deuteron) transfer on the intramolecular hydrogen by using HF and MP2 level of a multi-component molecular orbital method to treat the quantum effects of nuclei.
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July 10, 2008
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| 826-835
Aromatic Conjugation Pathways in Porphyrins
J. Aihara,* E. Kimura, and T. M. Krygowski
[Full Text PDF(J-STAGE)]
Porphyrins have been viewed as annulenoid species. Our graph-theoretical analysis of aromaticity, however, revealed that the main aromatic conjugation pathways in these macrocyclic compounds are those taken along four five-site circuits.
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July 10, 2008
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| 836-842
Infrared-Induced Reaction on MoO3 Using a Tunable Infrared Free Electron Laser
M. G. Moula, S. Sato, K. Irokawa, H. Niimi, S. Suzuki, K. Asakura,* and H. Kuroda
[Full Text PDF(J-STAGE)]
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We observed IR-induced reaction of C2H5OH on MoO3 using a pulsed and tunable infrared free electron laser (IR-FEL). The IR-FEL-induced reaction showed wavelength dependency and requires light stronger than a certain threshold level.
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| Web Release Date:
July 10, 2008
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| 843-846
Electron Spin–Lattice Relaxation Times of Spin Probes in Aqueous Dispersions of a Unique Amphiphilic Compound Obtained by a Saturation Recovery Method
K. Nakagawa
[Full Text PDF(J-STAGE)]
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Typical saturation recovery signal from 5-DSA in H2O dispersions of HCO at 20 °C. The dotted line indicates a single-exponential fit to obtain electron spin–lattice relaxation time.
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| Web Release Date:
July 10, 2008
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| 847-856
Hydrogen Adsorption Properties of Lantern-Type Dinuclear M(BDC)(DABCO)1/2
T. Takei, J. Kawashima, T. Ii, A. Maeda, M. Hasegawa, T. Kitagawa, T. Ohmura, M. Ichikawa, M. Hosoe, I. Kanoya, and W. Mori*
[Full Text PDF(J-STAGE)]
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In this work, we demonstrated the all complexes have been characterized by hydrogen adsorption/desorption measurement at various temperatures of 77–333 K and up to 10 MPa.
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July 10, 2008
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| 857-862
Curium(III) Complexation with Desferrioxamine B (DFO) Investigated Using Fluorescence Spectroscopy
H. Moll,* M. Glorius, and G. Bernhard
[Full Text PDF(J-STAGE)]
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Curium(III) forms in aqueous solution with desferrioxamine B (DFO) three complexes, CmH2DFO2+, CmHDFO+, and CmDFO, which were characterized using TRLFS. Complex stability constants were calculated, main luminescence bands and the luminescence lifetimes were determined.
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July 10, 2008
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| 863-868
Synthesis and Absolute Structure of (−)-Umtatin
S. Yamaguchi,* M. Kobayashi, S. Harada, M. Miyazawa, and Y. Hirai
[Full Text PDF(J-STAGE)] [Supporting Information]
Chiral (−)-umtatin (1) was synthesized starting from chiral (R)-(−)-2-isopropenyl-4,6-dimethoxy-2,3-dihydrobenzofuran (3), and the absolute structure was determined to R.
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July 10, 2008
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| 869-884
Structural Properties and Degree of Intramolecular Charge Transfer of an N-Alkyl Indoline–Tricyanoquinodimethane System
T. Murata,* K. Nishimura, Y. Enomoto, G. Honda, Y. Shimizu, A. Otsuka, and G. Saito*
[Full Text PDF(J-STAGE)] [Supporting Information]
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Intramolecular CT compounds having 1-alkyl-3,3-dimethyl-2-methyleneindoline (donor) and 7,8,8-tricyanoquinodimethane (acceptor) moieties linked through a π-bond were investigated. They exhibited self-assembling ability and two types of molecular conformations. The degree of CT was evaluated using bond length ratio and molecular orbital calculation.
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July 10, 2008
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| 885-893
Nickel-Catalyzed [4+2+2]-Type Annulation Reaction of Cyclobutanones with Diynes and Enynes
S. Ashida and M. Murakami*
[Full Text PDF(J-STAGE)]
In the presence of a nickel(0) catalyst, cyclobutanones reacted with diynes/enynes to produce bicyclic eight-membered ring ketones.
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July 10, 2008
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| 894-896
Formation of 4-Hydroxy-3-(oxan-3-yl)coumarin from Photochemical Reaction between 4-Hydroxycoumarin and 3,4-Dihydro-2H-pyran and MO Analysis
T. Shimo,* K. Sato, W. Wang, T. Obata, T. Iwanaga, T. Shinmyozu, and K. Somekawa
[Full Text PDF(J-STAGE)]
Photochemical reaction of 4-hydroxycoumarin with 3,4-dihydro-2H-pyran gave 4-hydroxy-3-(oxan-3-yl)coumarin. The reaction pathway was confirmed by molecular orbital methods, and is inferred to be evidence of regioselective triplet photoaddition.
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July 10, 2008
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| 897-905
The Alkylation of Naphthalene over One-Dimensional Twelve-Membered Ring Zeolites. The Influence of Zeolite Structure and Alkylating Agent on the Selectivity for Dialkylnaphthalenes
Y. Sugi,* H. Maekawa, H. Naiki, K. Komura, and Y. Kubota
[Full Text PDF(J-STAGE)] [Supporting Information]
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The alkylation of naphthalene (NP) was examined over one-dimensional 12-MR zeolites: MOR, AFI, ATS, and IFR. MOR and AFI gave higher selectivities for 2,6-dialkylnaphthalene (2,6-DAN) than ATS and IFR. Selectivities are governed by the discrimination of 2,6-DAN from its other isomers at the transition states in the channels which are varied by the types of zeolites and of alkylating agent.
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| Web Release Date:
July 10, 2008
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| 906-911
Permeability Study of Lipid-Coated Capsules with Confocal Laser Scanning Microscope (CLSM)
T. Zhang, L. Ge,* and H. Chi
[Full Text PDF(J-STAGE)]
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Fluorescence recovery after photo-bleaching experiment was carried out by CLSM in order to quantify the 6-carboxyfluorescein molecules passing through intact capsules′ wall. We found that the diffusion coefficient of the polyelectrolyte capsules was similar to the one of the lipid partly coated PE capsules or the products from catalyzed reaction.
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July 10, 2008
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| 912-916
Interfering Effect for the Cesium Ion-Exchange Property of Sodium Difluorotetrasilicate and Sodium Taeniolite by Alkaline-Earth Metal Ions
N. Suzuki,* T. Komuro, and Y. Kanzaki
[Full Text PDF(J-STAGE)]
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Cesium ion-exchange behavior of sodium difluorotetrasilicate (Na-TSM) and sodium taeniolite (Na-TAE) was investigated coexistent with alkaline-earth metal ions. Na-TSM is a suitable material when Cs+ collects separately, but Na-TAE is superior to Na-TSM as a buffer material for the stratum disposal because it uptakes both Cs+ and Sr2+.
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