bluuebunny/crossref_metadata_2025 huggingface dataset:
Two Modifications of Bridged Oxygen Atom in Binuclear Iron(III) Complexes with N-Alkyl-N,N-bis(benzimidazol-2-ylmethyl)amine
Authors: Nishida Yuzo , Haga Sachiko , Tokii Tadashi
Published: April 2006

From the reaction mixture of [Fe3O(CH3COO)6(H2O)3]Cl and N-alkyl(R)-N,N-bis(benzimidazol-2-ylmethyl)amine, (μ-oxo)bis(μ-acetato)diiron(III) complexes were prepared for R = ethyl, n-propyl, n-butyl, and benzyl. On the other hand, (μ-hydroxo)bis(μ-acetato) structure was inferred for the complexes with R = –CH2CH2OH based on the magnetic and spectroscopic results.
Structural Dependence on Photoaddition of Methanol to Arylalkenes. Solvent and Additive Effects on Photoinduced Electron Transfer Reaction
Authors: Mizuno Kazuhiko , Nakanishi Isao , Ichinose Nobuyuki , Otsuji Yoshio
Published: April 2006

The 9,10-dicyanoanthracene (DCA)-sensitized photoaddition of methanol to arylalkenes occurred both in benzene and acetonitrile to give the corresponding anti-Markownikoff type adducts. The efficiency of the photoreaction depended on the solvents and the structures of the substrates. The geminate radical ion pair in benzene and the solvent separated radical cation in acetonitrile were proposed as key intermediates. The stereochemical feature of the photoaddition of methanol to 1,2-dihydro-4-phenylnaphthalene was also described.
Transient Spectroscopy of the Redox Reactions of the Prussian Blue Membrane Having Electronic State Gradient
Authors: Toshima Naoki , Lin Ru-Jang , Kaneko Masao
Published: April 2006

The transient spectroscopic studies were carried out on a Prussian Blue (PB) membrane coated on an ITO electrode (5 cm × 1 cm), on which an electronic state gradient was realized. An isosbestic point was clearly observed in the trasient spectral changes when the PB was oxidized upon application of a potential from open-circuit to 1.5 V difference between the membrane terminals. The transient spectra observed on stepping back to open circuit showed three isosbestic points from the entirely oxidized state to the reduced states, to which a new electron transfer process is proposed.
CO and H2 Sensing Properties of Proton-Conductor Sensor Using Pt-Loaded Oxide Electrodes
Authors: Miura Norio , Kanamaru Kuniaki , Shimizu Youichi , Yamazoe Noboru
Published: April 2006

An amperometric proton-conductor sensor was newly developed for the selective detection of CO at room temperature by using a couple of Pt-loaded oxide (SnO2 and WO3) electrodes. The CO sensitivity of the sensor element was about 7 times higher than the H2 sensitivity and the 90% response time was about 3 min. The selective detection of H2 was possible when a Pt-black electrode was combined with a Pt-loaded WO3 electrode.
Kinetic Resolution of Enol Esters via Enzyme-Mediated Hydrolysis
Authors: Matsumoto Kazutsugu , Ohta Hiromichi
Published: April 2006

A new type of enzyme-mediated kinetic resolution has been developed. Enol esters, such as dl-3-acetoxy-1-p-methoxy-benzyloxy-2-methoxymethoxy-3-pentene, were hydrolyzed by incubation with Bacillus coagulans to afford optically pure enol esters, and the corresponding α-substituted ketones.
Intramolecular Reaction of Electrogenerated Phenoxy Cations with an Olefinic Side Chain
Authors: Shizuri Yoshikazu , Ohkubo Mitsuru , Yamamura Shosuke
Published: April 2006

Some phenols with an olefinic double bond at the side chain have been subjected to anodic oxidation under various conditions to afford tricyclo[5.3.1.01,5]undec-9-en-8,11-diones and two different spiro compounds, precursors of bioactive natural products.
Synthesis of C19–C27 Fragment of Ansa Chain Part of Rifamycin S
Authors: Katsuki Tsutomu , Hanamoto Takeshi , Yamaguchi Masaru
Published: April 2006

The C19–C27 fragment of the ansa chain part of rifamycin S was stereoselectively synthesized from (4Z)-1,2-epoxy-3-methyl-4-hexene by reiterative use of stereoselective epoxidation of cis-homoallylic alcohol and regioselective opening of the resulting epoxy alcohol as key steps.
Synthesis and Antitumor Activity of a New Dinuclear Platinum(II) Complex, Di-μ-sulfoacetato-bis[(1R,2R)-1,2-diaminocyclohexane]platinum(II)
Authors: Okude Kojiro , Ichida Hikaru , Miyamoto T Ken , Sasaki Yukiyoshi , Tashiro Tazuko
Published: April 2006

Di-μ-sulfoacetato-bis[(1R,2R)-1,2-diaminocyclohexane]platinum(II), [Pt(C6N2H14)]2(CO2CH2SO3)2, has been synthesized. The complex has a di-μ-carboxo bridged dinuclear structure and shows significant antitumor activity against mice leukemia L1210.
An Efficient Synthesis of 4-Deoxy-4-(hydroxyphosphinyl)-d-ribofuranoses. The First d-Ribofuranose Analogues Having Hydroxyphosphinyl Group in the Hemiacetal Ring
Authors: Yamamoto Hiroshi , Hanaya Tadashi , Kawamoto Heizan , Inokawa Saburo
Published: April 2006

Methyl 2,3-O-isopropylidene-β-d-ribopyranoside was converted (in 4 steps) into methyl 4-deoxy-4-[(dimethoxy)phosphinyl]-2,3-O-isopropylidene-β-d-ribopyranoside (10a, 30% overall yield). The title compounds were readily derived from 10a and characterized as the 4-deoxy-4-(methoxyphosphinyl) tetraacetates.
Palladium-Catalyzed Carbonylation of Aromatic Aldehydes and Hydrocarbons. A Novel Synthetic Route to α-Keto Amides via C–H Activation
Authors: Ozawa Fumiyuki , Yamagami Isao , Nakano Masataka , Fujisawa Fuminari , Yamamoto Akio
Published: April 2006

Aromatic aldehydes (ArCHO: quinoline-8-carbaldehyde and o-(N,N-dimethylamino)benzaldehyde) react with tertachloropalladate(II) through a C–H activation reaction to give the corresponding aroylpalladium complexes, which afford α-keto amides () in high yields upon carbonylation with piperidine. Attempts for double carbonylation through orthopalladation reactions of aromatic hydrocarbons are also reported.
Cubane-Type Molybdenum Aqua Ions. Preparation and Structures of [Mo4(μ3-O)(μ3-S)3(H2O)12]5+ and [Mo4(μ3-S)4(H2O)12]5+
Authors: Akashi Haruo , Shibahara Takashi , Narahara Taeko , Tsuru Hiroaki , Kuroya Hisao
Published: April 2006

Two cubane-type molybdenum aqua compounds, [Mo4OS3(H2O)12](CH3·C6H4·SO3)5·14H2O and [Mo4OS4(H2O)12](CH3·C6H4·SO3)5·14H2O have been prepared, and characterized by X-ray crystallography, electronic spectroscopy, and cyclic voltammetry. Their reduced species, [Mo4OS3(H2O)12]4+ and [Mo4S4(H2O)12]4+, have also been characterized.
A Simple Synthetic Method of [2.2]Cyclophanes by Lanthanoid-Mediated Coupling of Bis(bromomethyl)benzenes
Authors: Takahashi Senji , Mori Nobuo
Published: April 2006

The coupling of bis(bromomethyl)benzenes with iodized samarium, cerium or Misch metal gives [2.2]cyclophanes in satisfactory yields in a short time.
Asymmetric Aldol-type Reaction between Both Achiral Ketene Silyl Acetals and Aldehydes by the Use of a Chiral Promoter
Authors: Kobayashi Shu , Sano Tetsuya , Mukaiyama Teruaki
Published: April 2006

Highly enantioselective aldol-type reaction of achiral ketene silyl acetals with achiral aldehydes is carried out by the use of a chiral promoter, a combined use of chiral diamine coordinated tin(II) triflate and tributyltin fluoride.
A Novel Mode of Specific Interaction between CuCl2 and D-Fructose in Dimethyl Sulfoxide-Water Systems
Authors: Araki Koji , Shiraishi Shinsaku
Published: April 2006

The interaction of CuCl2 with D-fructose in a dimethyl-d6 sulfoxide(DMSO)-D2O mixture showed a large solvent effect with CuCl2 being found to interact specifically with the C4 and C5 hydroxyl groups of β-pyranose when the DMSO content was higher than 75% in the mixture.
Structure and Bonding of Two Modifications of CsSnI3 by Means of Powder X-Ray Diffraction, 127I NQR, and DTA
Authors: Yamada Koji , Tsuritani Tomoko , Okuda Tsutomu , Ichiba Sumio
Published: April 2006

A first-order phase transition accompanied by a color change from green to black was observed for CsSnI3 at about 425 K. These two modifications showed quite different 127I NQR spectra suggesting drastic structural change. High temperature modification has a perovskite structure with semi-metallic electric conductivity. The anion structure and bonding for the two modifications have been discussed on the basis of 127I NQR and X-ray diffraction data.
Crystal Structure of a 1:1 Inclusion Complex of (R,R)-(−)-1,6-Bis(o-chlorophenyl)-1,6-diphenylhexa-2,4-diyne-1,6-diol and (−)-(Z)-Benzylidene-2-(3-methylbutyl)azane Oxide
Authors: Toda Fumio , Tanaka Koichi , Mak Thomas C W
Published: April 2006

Crystal structure analysis of the title complex establishes the chirality of the (−)-(Z)-nitrone and the path of its photocylization to the corresponding optically active oxaziridine.
Determination of Catecholamines by an Electrochemical Flow-Through Detector with Indium–Tin Oxide Microelectrode Arrays Coated with Nafion
Authors: Matsue Tomokazu , Aoki Atsushi , Abe Takayuki , Uchida Isamu
Published: April 2006

An electrochemical flow-through detector with indium–tin oxide interdigitated microelectrode arrays was used for the determination of catecholamines. This detector showed amplification of the current signals by redox cycling. The undesired response due to ascorbic acid can be eliminated by coating the electrode surface with Nafion.
Synthesis of β-Lactams from Novel Stannous Enolates and Imines
Authors: Sugano Yuichi , Naruto Shunji
Published: April 2006

From the oxygen esters containing sulfur α-substituent, corresponding stannous enolates were prepared by the use of stannous trifluoromethanesulfonate. The enolates reacted with various imines to provide β-lactams.
Synthesis of 1,4-Thiazepine Derivatives Having Angiotensin-Converting Enzyme Inhibitory Property
Authors: Yanagisawa Hiroaki , Ishihara Sadao , Ando Akiko , Kanazaki Takuro
Published: April 2006

Reduction of (6R)-6-amino-6,7-dihydro-2-thienyl-1,4-thiazepin-5(4H)-one derivatives with Mg–MeOH gave the corresponding perhydrothiazepinones. Protection with trityl group at the 6-amino group gave predominantly the 2S,6R isomer which was converted to the potent angiotensin-converting enzyme (ACE) inhibitor. The ACE inhibitor having the 6,7-dihydro-l,4-thiazepin-5(4H)-one ring was also prepared.
Liquid Phase Methanol Synthesis on Cu–Zn Ultrafine Particles Prepared by Chemical Deposition in Liquid Phase
Authors: Itoh Hiroyuki , Saito Toshiya , Shibue Toshimichi , Kikuchi Eiichi
Published: April 2006

Liquid phase methanol synthesis was investigated over ultrafine particle (UFP) catalysts prepared by chemical deposition in liquid phase. The UFP prepared by reduction of Cu and Zn acetylacetonates by LiAlH4 in THF solution showed a very high methanol productivity which is greater than twice that of a Cu–Zn–Al coprecipitated oxide catalyst.
Stereoselective 1,2-cis Glycosylation Reaction of 1-O-Acetylribose with Silylated Nucleophiles by the Promotion of a New Catalyst System
Authors: Mukaiyama Teruaki , Shimpuku Tetsuro , Takashima Tohru , Kobayashi Shu
Published: April 2006

1,2-cis-Ribofuranosides are stereoselectively prepared in high yields by the reaction of 1-O-acetyl-β-d-ribose with silylated nucleophiles by the promotion of a new catalyst system, the combined use of a catalytic amount of tin(IV) chloride and tin(II) triflate with a stoichiometric amount of lithium perchlorate.
Dehydrogenation of Alkylamines on Acid-Base Hybrid Catalyst
Authors: Xu Bo-Qing , Yamaguchi Tsutomu , Tanabe Kozo
Published: April 2006

A peparation of hybrid catalysts of SiO2·Al2O3–MgO (SA/MgO) and silanized MgO (SiOx/MgO) was attempted for the purpose of obtaining a new category of the acid-base bifunctional catalyst. The resultant catalyst was applied to the catalytic decomposition of alkylamines to yield acetonitrile via a dealkylation–dehydrogenation reaction.
Catalytic Evidence of Formation of Water-Induced Silicomolybdic Acid on a MoO3/SiO2 Catalyst
Authors: Ogata Atsushi , Kazusaka Akio , Yamazaki Akiko , Enyo Michio
Published: April 2006

The formation of silicomolybdic acid induced by the preadsorbed or catalytically formed water on MoO3/SiO2 was evidenced by typical heteropoly acid catalysed reactions, isomerization of 1-butene or dehydration of 2-propanol.
Bridged Radical Intermediates of Aryl [1,2] Rearrangements
Authors: Yamabe Shinichi
Published: April 2006

Bridged-form free-radical intermediates are calculated to be present in the course of aryl [1,2] sigmatropic rearrangements. The geometry of cyclopropane rings involved in intermediates is not affected by substituents.
Photoreduction of Hydroxo(tetramesitylporphinato)iron(III) in Aromatic Hydrocarbons and the Concurrent Generation of Hydroxyl Radical
Authors: Tohara Akira , Sato Mitsuo
Published: April 2006

Hydroxo(tetramesitylporphinato)iron(III) in degassed benzene, toluene, and ethylbenzene is confirmed to be reduced to the four coordinate ferrous complex upon irradiation with light λ > 300 nm. Production of diphenyl and solvent dependence of photoreduction rates support the concurrent generation of hydroxyl radical along with the ferrous complex production.
Isotopic Studies on Oxidative Methane Coupling over Samarium Oxide
Authors: Otsuka Kiyoshi , Inaida Masakatsu , Wada Yuji , Komatsu Takayuki , Morikawa Akira
Published: April 2006

The evident kinetic isotope effect was observed for the formations of ethylene and ethane through the oxidative coupling of methane on Sm2O3, when CH4 and CD4 were used as the reactants. Ethanes formed in the reaction of a mixture of CH4, CD4, and O2 were C2H6, C2H3D3, and C2D6 as major products. These results indicate that the rate-determining step of the reaction is abstraction of hydrogen from methane and that ethane is formed through the coupling of methyl intermediate.
Solvent Extraction of Copper(II) Ion with p-t-Butylcalix[6]arene from the Ammonia Alkaline Solution
Authors: Yoshida Isao , Fujii Shigehiro , Ueno Keihei , Shinkai Seiji , Matsuda Tsutomu
Published: April 2006

It was found that p-t-butylcalix[6]arene(tb-calix[6], H2L) in the organic solvents such as chloroform or benzene can extract copper(II) ion from the ammonia alkaline solution. The results from extraction study suggested the formation of the 1:1 copper(II) to tb-calix[6] complex as the extracted species.
Photoinduced Direct Synthesis of Formic Acid and Methyl Formate from Methanol in the Presence of Hydrogen Peroxide
Authors: Shimizu Yuichi , Sugimoto Shun’ichi , Kawanishi Shunichi , Suzuki Nobutake
Published: April 2006

Formic acid and methyl formate were directly synthesized by UV irradiation of the oxygen-saturated methanol containing hydrogen peroxide. The formations of formic acid and methyl formate were affected by H2O2 feeding rate. The combined selectivity of formic acid and methyl formate formations was 99%.
Synthesis of Clavulone Derivatives. Selective Cleavage of Ester Bonds in Clavulone
Authors: Iguchi Kazuo , Kaneta Soichiro , Nagaoka Hiroto , Yamada Yasuji
Published: April 2006

The clavulone derivatives (1-O-demethylclavulone II and 4-O-deacetylclavulone II) were synthesized from clavulone II (1) by selective enzymatic hydrolysis of 1 using porcin liver esterase (PLE) and orange peel acetylesterase, respectively. The derivative (12-O-deacetylclavulone II) was synthesized by organocuprate reduction of 10,11-epoxyclavulone II which was prepared from 1.
Iron(II) Complex with 1,3-Bis(2-benzimidazyl)-2-thiapropane as a Model Compound for Lipoxygenase
Authors: Nishida Yuzo , Haga Sachiko
Published: April 2006

Iron(II) complex with 1,3-bis(2-benzimidazyl)-2-thiapropane is stable in air in both the solid and the solution states. This complex is oxidized to Fe(III) state by 13(S)-hydroperoxy-9Z,11E-octadecadienoic acid, and the Fe(III) species is readily reduced to Fe(II) state by phenidone. This suggests the presence of thioether group in the coordination sphere of native lipoxygenase.
Selectivities of α-Halosulfinyl Carbanions towards Enones
Authors: Mahidol Chulabhorn , Reutrakul Vichai , Panyachotipun Chitchanun , Turongsomboon Gunniga , Prapansiri Vichukorn , Bandara B M R
Published: April 2006

The reactions of lithio α-chloromethyl and α,α-dichloromethyl phenyl sulfoxides with enones gave 1,2 and 1,4 adducts respectively. The reaction of the latter carbanion with enones provides a useful synthesis of novel substituted cyclopropanes.
Spin Trapping Studies of Peroxyl Radicals. Detection of the Reactive Intermediates for Oxidation Generated from O2−• and Sulfonyl, Sulfinyl, and Phosphoryl Chlorides
Authors: Kim Yong Hae , Lim Sang Chul , Hoshino Mikio , Ohtsuka Yasuo , Ohishi Takeshi
Published: April 2006

The spin trapping studies by ESR have demonstrated that O2−• efficiently reacts with 2-nitrobenzenesulfonyl chloride, 2-nitrobenzenesulfinyl chloride, and diphenylphosphoryl chloride, to result in the formation of their peroxyl radicals, some of which have been key intermediates for site-selective oxidation of certain organic molecules and argued whether they exist as anion and/or radical form.
Very Large Cooperative Phenomena on the Main Phase Transition of L-α-Dipalmitoylphosphatidic Acid During the Cooling Process
Authors: Sakaguchi Hiroshi
Published: April 2006

Gel/liquid crystal phase transition of concentrated water suspension of L-α-dipalmitoylphosphatidic acid was examined by using differential scanning calorimeter. During the cooling process, very sharp exothermic curve was obtained compared with endothermic one during the heating process. This sharp peak is a good evidence of high cooperativity among alkyl chains of lipid molecules during the transition from liquid crystalline phase to gel phase.
New Method to Determine the External Surface Area of ZSM-5 Zeolite
Authors: Sato Hiroshi , Sakamoto Akemi , Hirose Kenichi , Chikaishi Kazuhiro
Published: April 2006

The external surface area of ZSM-5 zeolite obtained by the benzene filled-pore method is smaller than that by the electron micrograph method when the crystalline diameter is smaller than 0.3μm. On the other hand, the surface area of ZSM-5 which contains template in its intra-crystalline micro-pores agrees well with the external surface area of calcined ZSM-5 obtained by the electron micrograph method in a whole range of crystalline diameters.
Hydrogenation of Carbon Monoxide over the Mixed Catalyst Composed of Co–Ni/MnO–ZrO2 and Zeolite Catalyst
Authors: Ishihara Tatsumi , Iwakuni Hideharu , Eguchi Koichi , Arai Hiromichi
Published: April 2006

The mechanical mixtures of Co–Ni/MnO–ZrO2 and zeolite were used as catalysts for the selective synthesis of gasoline by CO hydrogenation. Formation of branched-paraffins was promoted but that of higher hydrocarbons than carbon number of 10 was suppressed by combination with zeolite. The product distribution strongly depended on the type of zeolite catalyst. The combination of Co–Ni/MnO–ZrO2 with PtH-pentasil zeolite was very active for the formation of gasoline with high octane number.
Development of Extraction and Separation Monitoring in Situ with On-line SFE·SFC/FTIR System
Authors: Ikushima Yutaka , Saito Norio , Hatakeda Kiyotaka , Ito Shota , Goto Tomio
Published: April 2006

On-line SFE·SFC/FTIR with a high pressure flow cell withstanding pressures as high as 50 MPa was built up to make an in situ observation at supercritical state. The extraction and separation efficiency determined by this system was correlated with a parameter derived from solubility parameter concept.
Propylene Metathesis by Use of Novel TiCl4 or Ti(O-i-Pr)4-treated Low Valent Lanthanide Particles (Sm and Yb)
Authors: Imamura Hayao , Koda Kazuyoshi , Miura Hiroshi , Tsuchiya Susumu
Published: April 2006

TiCl4 or Ti(O-i-Pr))4-treated low valent, highly dispersed lanthanide particles (Sm and Yb) prepared by metal vapor deposition exhibited the activity for propylene metathesis at 333–473 K. Propylene was selectively converted to ethylene and but-2-ene.
Nonlinear Optical Properties and Structure of Biphenyls Containing Donor–Acceptor Chromophores and Bulky Substituents
Authors: Takagi Koichi , Ozaki Mitsuo , Nakatsu Kazumi , Matsuoka Masaru , Kitao Teijiro
Published: April 2006

Effects of various substituents including chromophores on the second harmonic generation(SHG) of biphenyls were examined. Among them, 4-hydroxy-3,5-di(t-butyl)-2′,4′-dinitrobiphenyl (1d) exhibited effective SHG response. The X-ray structure of 1d shows that the molecule is skewed around the 1–1′ bond and the molecular arrangement along the c-axis in the space group of Pca21 is favorable for SHG.
Interaction of Guanine Nucleotides with Ribonuclease F1′ as Studied by Absorption and Circular Dichroism Spectroscopies
Authors: Yoshida Hiroshi , Kanae Hidehiko
Published: April 2006

Difference spectra have been observed in both absorption and circular dichroism upon binding of various guanine nucleotides to ribonuclease F1′. The dissociation constants of the enzyrne–nucleotide complexes have been determined based on the difference absorption spectra. The results have been compared with those obtained with ribonuclease T1.
Electron Microscopic Studies of Crystalline and Amorphous Monolayers of Fatty Acids
Authors: Kajiyama Tisato , Tanimoto Youichi , Uchida Motoko , Oishi Yushi , Takei Ryutaro
Published: April 2006

A crystalline monolayer was observed at the subphase temperature Tsp below the melting point Tm of monolayers, while an amorphous monolayer was observed at Tsp above Tm of the monolayer, irrespective of the magnitude of surface pressure. A π-A isotherm depends on the phase of a monolayer; a plateau on the π-A isotherm (coexistence of solid and liquid phases) was observed for an amorphous monolayer and also, no plateau on the π-A isotherm (coexistence of solid and gas phases) for a crystalline monolayer. The phase transition from an amorphous to a crystalline state was not detected during compressing a monolayer.
Direct Preparation of Mesophase Pitch from Naphthalene by the Aid of HF/BF3
Authors: Mochida Isao , Shimizu Kiyoyuki , Korai Yozo , Sakai Yukio , Fujiyama Susumu
Published: April 2006

Direct preparation of mesophase pitch from naphthalene was studied using HF/BF3 in an autoclave under autogeneous pressure at 260 °C. A mesophase pitch of 100% anisotropy was produced catalytically first at a yield above 60%. The pitch carried 52% of benzene soluble fraction, exhibiting softening temperature of as low as 215 °C. The pitch consisted principally of naphthalene oligomers which carried a large content of naphthenic hydrogens with some alkyl and phenyl groups. The pitch was smoothly spun into thin fiber, which was rapidly stabilized for 30 min at 270 °C.
Gravimetric Characterization of Porous Ceramic Thin Films with Quartz Crystal Microbalance
Authors: Yoshikai Masaaki , Machida Masato , Eguchi Koichi , Arai Hiromichi
Published: April 2006

Direct measurement of N2 adsorption onto porous Al2O3 films was examined with a quartz crystal microbalance at 77 K. Nitrogen adsorption led to the change in resonant frequency (ΔF) of the Al2O3 coated quartz crystal. A cumulative plot of ΔF at the relative pressure corresponds to the N2 adsorption isotherm, from which pore size distribution and surface area of the Al2O3 thin films (ca. 0.1 mg) were successfully obtained.
Molecular and Crystal Structures of E- and Z-Isomers of 2,5-Dimethyl-3-furylethylidene(isopropylidene)-succinic Anhydride
Authors: Yoshioka Yasunori , Tanaka Takanori , Sawada Masami , Irie Masahiro
Published: April 2006

Molecular and crystal structures of E- and Z-isomers of 2,5-dimethyl-3-furylethylidene(isopropylidene)-succinic anhydride were examined. Both isomers have structures twisting between the furan ring and the succinic anhydride portion. The photocyclization reaction is initiated by a π–π* transition from each part of the molecule, not from a π-orbital delocalized over the molecule.
Decomposition of Chlorofluorocarbons by the Reaction with Water Vapor Catalyzed by Iron Oxide Supported on Activated Carbon
Authors: Okazaki Susumu , Kurosaki Akito
Published: April 2006

Chlorofluorocarbons such as CClF3 and CCl2FCClF2 were readily decomposed by the reaction with water vapor at temperatures higher than 450 °C in the presence of iron oxide supported on activated carbon.
Selective Sugar Binding with a Synthetic Polyhydroxy Macrocycle. A Remarkable Selectivity for Fructose over Glucose
Authors: Tanaka Yasutaka , Ubukata Yumiko , Aoyama Yasuhiro
Published: April 2006

D-Fructore, a ketohexose, is readily solubilized in CCl4 via complex formation with resorcinol-dodecanal cyclotetramer (1) , in marked contrast to D-glucose, a closely related aldohexose, which shows almost no affinity to 1. The affinity of fructose can be further enhanced by oligomeric modification of 1.
[1,2-Benzenediolato(2−)-O-O′]oxotitanium. A Chemoselective and Efficient Catalyst for Aldol-type Reaction of Ketene Silyl Acetals with Aldehydes
Authors: Hara Ryuichiro , Mukaiyama Teruaki
Published: April 2006

In the presence of a catalytic amount of [1,2-benzenediolato(2−)-O,O′]oxotitanium, ketene silyl acetals smoothly react with aldehydes to afford the corresponding β-hydroxy carboxylic esters in good yields under mild conditions. According to this procedure, an aldehyde group is selectively activated, while an acid labile acetal group remains intact.
New Reactions of a Thionitrosoarene
Authors: Takahashi Masaki , Okazaki Renji , Inamoto Naoki
Published: April 2006

A transient thionitrosoarene was trapped by an azide, diazo compound, oxygen, and thiirane to give a sulfur diimide, thiocarbonylimine, N-sulfinylaniline, and N-thiosulfinylaniline, respectively. In the reaction with oxygen N-sulfonylaniline was also formed and underwent a novel type of intramolecular cyclization.
Amphiphilic Compounds Having Pyrazine Nucleus. Formation of Monolayer and Langmuir–Blodgett Film
Authors: Takehara Kenji , Niino Hiroyuki , Oozono Yasuhiko , Isomura Kazuaki , Taniguchi Hiroshi
Published: April 2006

Among the all types of amphiphilic carboxylic acids, having phenylpyrazine as the chromophore and alkyl or alkoxy group as the hydrophobic part, 5-(4′-alkoxyphenyl)pyrazine-2-carboxylic acid formed the most stable and closely packed monolayer, which could be easily deposited to form a Y-type Langmuir–Blodgett film.
[4+2]-Type Cycloadditions of Tropone and Heptafulvene Derivatives with a Tautomeric Mixture of Cycloheptatrienylidene and Cycloheptatetraene
Authors: Saito Katsuhiro , Watanabe Tetsuya , Takahashi Kensuke
Published: April 2006

Reactions of tropone derivatives and 8,8-dicyanoheptafulvene with a tautomeric mixture of cycloheptatrienylidene and 1,2,4,6-cycloheptatetraene afforded [4+2]-type cycloadducts.
Metalloporphyrin-Catalyzed Reduction of Dioxygen by Ferrocene Derivatives
Authors: Fukuzumi Shunichi , Mochizuki Seiji , Tanaka Toshio
Published: April 2006

Metalloporphyrin-catalyzed reduction of dioxygen by ferrocene derivatives occurs efficiently via outer-sphere electron transfer from ferrocene derivatives to metalloporphyrins (MTPP+), followed by acid-catalyzed reduction of dioxygen by MTPP in the presence of perchloric acid in acetonitrile.
Acid-Catalyzed Reduction of Ketones by an NADH Model Compound and the Relation with Acid-Catalyzed Photoinduced Electron-Transfer Reactions
Authors: Fukuzumi Shunichi , Chiba Makoto , Tanaka Toshio
Published: April 2006

Various ketones are readily reduced by an acid-stable NADH model compound, 10-methylacridan (AcrH2), in the presence of perchloric acid in acetonitrile. Rates of the acid-catalyzed reduction of ketones by unprotonated AcrH2 are well correlated with rates of the acid-catalyzed photoinduced electron-transfer reactions from the excited state of [Ru(bpy)3]2+ to the ketones.
Formation of Radical Cations of Dihydropteridine and Dihydroflavin in the Photoreduction of Pteridine and Flavin Analogues by Benzyl Alcohol Derivatives
Authors: Fukuzumi Shunichi , Tanii Kumiko , Tanaka Toshio
Published: April 2006

Radical cations of dihydropteridine and dihydroflavin are formed in the photoreduction of pteridine and flavin analogues, respectively, by benzyl alcohol derivatives in the presence of perchloric acid in acetonitrile via photoinduced electron transfer from benzyl alcohol derivatives to the triplet excited states of protonated pteridine and flavin analogues. Their ESR spectra and the stabilities are compared.
Microbial Synthesis of Optically Pure α-Methoxy-α-trifluoromethyl-α-phenylacetic Acid
Authors: Ohta Hiromichi , Miyamae Yoshitaka , Kimura Yoichi
Published: April 2006

Preparatin of optically pure α-methoxy-α-trifluoromethyl-α-phenylacetic acid via microbial asymmetric hydrolysis of cyanohydrin acetate as the key step is described.
Cyclodextrin-Coupled Protoporphyrinatoiron Complex and Its Semi-Stable Oxygen Adduct Formation in an Aqueous Medium
Authors: Eshima Kiyoshi , Matsushita Yoh-ichi , Hasegawa Etsuo , Nishide Hiroyuki , Tsuchida Eishun
Published: April 2006

Protoporphinatoiron IX was coupled with α-cyclodextrin on its secondary hydroxy groups side with three urethane bonds. This cyclodextrin-coupled porphinatoiron shows reduced acute toxicity and forms an oxygen adduct in cooled aqueous medium.
Consistent Correlation between Absolute Configuration of α-Hydroxy Carboxylic Acids and Lanthanoid Induced Shift by an NMR Chiral Shift Reagent in Aqueous Solution
Authors: Kabuto Kuninobu , Sasaki Yoichi
Published: April 2006

The absolute configuration of various α-hydroxy acids, including those with polar substituent(s) on the side chain, have been consistently correlated with the relative position of α-proton or α-methyl signals due to their enantiomers in 1H NMR in the presence of the chiral shift reagent for aqueous solution, 1,2-propanediaminetetraacetatoeuropium(III).
Synthesis of Novel Tetraazapentalene Derivatives (10-S-3) with a Hypervalent Sulfur and Carbonyl Groups
Authors: Matsumura Noboru , Mori Osamu , Tomura Masaaki , Yoneda Shigeo
Published: April 2006

Tetraazapentalenes (R = CH3 and CH2=CHCH2) reacted with isocyanates to give new types of tetraazapentalenes, (2) and (3). The compounds, 2 and 3 were also obtained by the reaction of isocyanates with thiadiazolopyrimidines.
Synthesis of Superconducting Oxide by Mist Pyrolysis Method
Authors: Awano Masanobu , Takagi Hiroyoshi , Torii Yasuyoshi , Murayama Norimitsu , Sudo Eiichi
Published: April 2006

The powder of oxide superconductor was synthesized by the mist pyrolysis method. Ba2YCu3O7−y single phase particles were produced at reaction temperature of about 950 °C. The particle size changed with the concentration of starting solution and was about 0.1 μm diameter at the concentration of 0.00125 mol/l. They had homogeneity as the result of pyrolysis of droplets, including stoichiometric components.
Unusual Activation of Irreversibly Adsorbed CO on CeO2
Authors: Arai Toru , Maruya Ken-ich , Domen Kazunari , Onishi Takaharu
Published: April 2006

Irreversibly adsorbed CO at 273 K on partially reduced CeO2 was hydrogenated to form C1–C6+ hydrocarbons at 473 K. The amount of adsorbed CO and the rate of hydrocarbon formation increased with increasing the extent of reduction of CeO2·Ce3+ and/or oxygen vacancy on the surface is an active center for the adsorbed CO hydrogenation.
An Evidence for Remarkable Difference of the Electrophilicity between Two Carbonyl Groups in the Photoexcited 1,2-Naphthoquinone. Photocycloaddition Reaction of 1,2-Naphthoquinone with Olefins
Authors: Takuwa Akio
Published: April 2006

The [4+2]photocycloaddition reactions between 1,2-naphthoquinone and olefins have been investigated. From the results of the stereochemistry and the regiochemistry of the adducts, it is concluded that the carbonyl oxygen atom at the position 2 in the photoexcited triplet state of 1,2-naphthoquinone attacks selectively one of the olefinic carbons.
Photocross-linking and the Cleavage of DNA by Iron Complex-substituted Psoralen
Authors: Nakamura Yushin
Published: April 2006

The iron complex-substituted psoralen (1) having a moiety capable of photochemically cross-linking to DNA and a DNA cleaving moiety was synthesized. The photoreaction of which is noniron complex of 1, with Col E1 plasmid DNA gave the covalently interstrand cross-linked DNA which was cleaved in the presence of FeSO4 and dithiothreitol under air.
Novel Phenolics from Phytopathogenic Fungus Helicobasidium mompa
Authors: Kajimoto Tetsuya , Yamashita Masami , Imamura Yohko , Takahashi Kokichi , Nohara Toshihiro , Shibata Motoo
Published: April 2006

Novel phenolics HM-1(3), HM-2(5), HM-3(6), and HM-4(7) were obtained from phytopathogenic fungus Helicobasidium mompa which causes violet root rot against mulberry and several kinds of fruit trees. Compounds 3 and 7 could be precursors of helicobasidin and deoxyhelicobasidin, which have already been isolated from the same oriqin, while 5 and 6 were unusual types of C15-compound.
Catalytic Activity of Mixed Metal Oxides for Selective Oxidation of Propane to Acrolein
Authors: Kim Young-Chul , Ueda Wataru , Moro-oka Yoshihiko
Published: April 2006

Various mixed metal oxide catalysts were tested for the oxidation of propane to acrolein. An Ag-doped bismuth vanadomolybdate catalyst was found to be most effective among the catalysts tested; the selectivity to acrolein reached to more than 60% at 13% conversion of propane.
Partial Oxidation of Ethane over Boron Oxide Added Catalysts
Authors: Murakami Yasushi , Otsuka Kiyoshi , Wada Yuji , Morikawa Akira
Published: April 2006

B2O3–Al2O3, B2O3–MgO, B2O3–La2O3, and B2O3–P2O5 are selective catalysts for the partial oxidation of ethane. Among these catalysts, B2O3(30wt%)-added Al2O3 showed the highest catalytic activity in the formations of acetaldehyde (yield 1.03%) and ethylene (14.6%). Acetaldehyde is formed not via ethylene but directly from ethane. The formations of ethylene and acetaldehyde occur on different active sites.
Active Species of CuY Zeolite Catalyst in CO Oxidation at Low Temperatures
Authors: Tanabe Shuji , Matsumoto Hiroshige
Published: April 2006

The formation and catalytic behavior of active species in CuY zeolite were investigated with aids of TPR and EXAFS measurements. The active species formed during a reduction–reoxidation treatment was directly and reversibly reduced to Cu metal clusters with CO, indicating that the CO oxidation on the zeolite proceeded via the redox mechanism of active CuO clusters.
Remarkable Activities of Ni–Cu/SiO2 Catalysts for the Decomposition of Methanol to Syngas
Authors: Tada Akio , Watarai Yutaka , Takahashi Katuhiro , Imizu Yuzo , Itoh Hidenobu
Published: April 2006

The activities and selectivities of Ni–Cu/SiO2 catalysts for the titled reaction were investigated. The binary metal catalysts exhibited much higher performances than Ni/SiO2 and Cu/SiO2. In particular, 100% conversion and 100% CO selectivity were obtained over Ni0.1Cu0.9/SiO2 at a reaction temperature as low as 280 °C during the process time of 96 h.
Crystal Structure of the Electrochemical Product of Potassium Dicyanophthalocyaninatocobalt(III). Novel Two-Dimensional Stacking Interaction of Phthalocyanine
Authors: Inabe Tamotsu , Maruyama Yusei
Published: April 2006

The crystal obtained by electrocrystallization of potassium dicyanophthalocyaninatocobalt (III), K[Co(Pc) (CN)2], in acetonitrile has been found to be a cation deficient salt, K[Co(Pc)(CN)2]2(CH3CN)5. The structural study has indicated that partly overlapped phthalocyanine rings form a two-dimensional sheet.
The Use of a Nicotinoyl Group as a Protective Group for Hydroxyl and Amino Functions
Authors: Ushida Satoshi
Published: April 2006

The effective use of a nicotinoyl group as an easily introducible and cleavable protective group for hydroxyl and amino groups is described. Deprotection by alkaline hydrolysis is performed after activation by quarternization of pyridine moiety with methyl iodide.
Remarkably Facile 1,3-Diol Fragmentation. Synthesis of a Seco-sesquiterpene of Tobacco
Authors: Kato Michiharu , Tooyama Youichi , Yoshikoshi Akira
Published: April 2006

A benzylic hydroxyl group activated by the 2,6-dimethoxy-4-methylphenyl group was proved to be a remarkably reactive nucleofuge in 1,3-diol fragmentation under mild conditions. 4-(2,2,6-Trimethyl-6-vinylcyclohexyl)-2-butanone, a seco-sesquiterpene, was synthesized by using a fragmentation product thereby obtained.
Preparation of Electroactive Poly(dihydroxyphenylene)
Authors: Yamamoto Kimihisa , Asada Toshio , Nishide Hiroyuki , Tsuchida Eishun
Published: April 2006

Hydroquinone is electro-oxidatively polymerized to poly(dihydroxyphenylene), which is a Nernstian-type electroactive polymer (E° = 0.7 V in acidic medium) and shows a redox reaction through two-electron transfer accompanied with 4 protons dissociation on Pt electrode.
A Novel Glycosylation Reaction of 2-Amino-2-deoxy-d-glucopyranose Using Dimethylphosphinothioate
Authors: Inazu Toshiyuki , Yamanoi Takashi
Published: April 2006

β-Glucosides were stereoselectively obtained in good yields from 3,4,6-tri-O-benzyl-2-benzyloxycarbonylamino-2-deoxy-α-d-glucopyranosyl dimethylphosphinothioate with several alcohols in the presence of iodine and a catalytic amount of trityl or perchlorate salts.
A New Approach in the Construction of the Pentacyclic Ring System of Neosurugatoxin
Authors: Okada Kunisuke , Mizuno Yasushi , Tanino Hideo , Kakoi Hisae , Inoue Shoji
Published: April 2006

Details on a second synthetic procedure of neosurugatoxin framework are described using a Diels–Alder adduct obtained from 6-bromo-3-ethoxycarbonylmethylene-2-oxoindoline and 1,3-pentadiene.
Kinetic Study on the γ-Radiolysis of 5-Fluorouracil Derivatives
Authors: Kuroda Tokuyuki , Hisamura Koji , Nakamizo Nobuhiro , Otsuji Yoshio
Published: April 2006

The reactivity of 5-fluoro-1-(2-phenylethenesulfonyl)uracil (1) and 5-fluoro-1-phenylthioureidouracil (2) in the γ-radiolysis of their aqueous solutions was studied by a competitive kinetic method using nitrobenzene and acetone as reference compounds. The rate constants for the reactions of 1 and 2 with eaq− were of the same order of magnitude as that for nitrobenzene. The efficiencies of the conversion of intermediates generated from 1 and 2 into 5-fluorouracil were also estimated.
Dinitrogen Species Adsorbed on ZrO2 Studied by Infrared Spectroscopy
Authors: Sakata Yoshihisa , Abe Hiroshi , Kondo Junko , Maruya Ken-ichi , Domen Kazunari , Onishi Takaharu
Published: April 2006

Infrared active dinitrogen band was observed at 2341 cm−1 on a ZrO2 surface at 300 K. These species disturb the dissociative adsorption of hydrogen on ZrO2.
Tris(4-t-butylphenylcarbamate)s of Cellulose and Amylose as Useful Chiral Stationary Phases for Chromatographic Optical Resolution
Authors: Okamoto Yoshio , Hatano Kazuhiro , Aburatani Ryo , Hatada Koichi
Published: April 2006

Cellulose tris(4-t-butylphenylcarbamate) and amylose tris(4-t-butylphenylcarbamate) were adsorbed on macroporous silica gel and used as chiral stationary phases for high-performance liquid chromatography to separate racemic compounds. The carbamates, particularly cellulose derivative, exhibited remarkable optical resolving power, and resolved racemic drugs such as chloroquine and nicardipine which were not resolved on other phenylcarbamate derivatives of cellulose and amylose.
Efficient Cleavages of Ribonucleoside 2′,3′-Cyclic Phosphates and Ribonucleotide Dimers Catalyzed by β-Cyclodextrin Attached with Diethylenetriamine-Zinc(II) Complex
Authors: Komiyama Makoto , Matsumoto Yoichi
Published: April 2006

The complex between a modified β-cyclodextrin, which is attached with a diethylenetriamine residue at the primary hydroxyl side, and zinc(II) ion effectively and homogeneously catalyzes the cleavages of the 2′,3′-cyclic monophosphates of ribonucleosides and the ribonucleotide dimers. The magnitude of the catalysis is highly dependent on the kind of the nucleic base in the substrates.
Vibrational Circular Dichroism of Metal Complexes Containing trans-1,2-Diaminocyclohexane
Authors: Morimoto Hideharu , Kinoshita Isamu , Mori Masayasu , Kyogoku Yoshimasa , Sugeta Hiromu
Published: April 2006

The vibrational circular dichroism of (1R,2R)-diaminocyclohexane complexes of Pd(II), Cu(II), Ni(II), and Co(III) in CD3CN are characterized by positive and negative bands for the antisymmetric and symmetric NH2 stretching vibrations, respectively. This feature is attributable to the λ conformation of the chelate ring.
Palladium-catalyzed Desulfonylative Carbonylation of Arylsulfonyl Chlorides in the Presence of Titanium Tetraalkoxides
Authors: Miura Masahiro , Itoh Kenji , Nomura Masakatsu
Published: April 2006

The carbonylation of arylsulfonyl chlorides with a catalytic amount of tetrakis(triphenylphosphine)palladium(0) in the presence of a titanium tetraalkoxide gives the corresponding esters along with diaryl disulfides.
ESR and Structure of Cation Radicals of 2,3,6,7-Tetrahydro-1,4,5,8-tetrathiaanthracene and 2,3,6,7-Tetrahydro-1,4,5,8-tetrathiaphenanthrene
Authors: Morihashi Kenji , Kikuchi Osamu , Nabeshima Tatsuya , Iwata Satoru , Furukawa Naomichi
Published: April 2006

The cation radicals of 2,3,6,7-tetrahydro-1,4,5,8-tetrathiaanthracene (HTA) and 2,3,6,7-tetrathia-1,4,5,8-tetrathiaphenanthrene (HTP) have been characterized by ESR spectroscopy. The remarkable alternating linewidth effects were observed in the spectra of HTA+• and HTP+• both in concd H2SO4 and in AlCl3/CH3NO2.
Cp2TiPh2-Catalyzed Dehydrogenative Coupling of Polyhydromonosilanes
Authors: Nakano Taichi , Nakamura Hidehisa , Nagai Yoichiro
Published: April 2006

The Cp2TiPh2-catalyzed reaction of dihydrosilanes afforded dehydrogenative coupling products, disilanes and/or trisilanes. The reaction using phenylsilane produced hydride-terminated poly(phenylsilylene) polymers with = 730 and = 960, which exhibited the longest UV absorption maximum at 245 nm(ε, 5.7 × 104).
Racemization of (−)-Vincadifformine Using Microwave Oven
Authors: Takano Seiichi , Kijima Atsushi , Sugihara Takumichi , Satoh Shigeki , Ogasawara Kunio
Published: April 2006

Thermolysis of (−)-vincamine in DMF using a microwave oven has brought about total racemization via concurrent Diels–Alder cycloreversion and cycloaddition.
Ring Expansion Reaction of Heterocyclic Cation Compounds by Incorporating One Nitrogen Atom Using I2–NH3 System
Authors: Yonemoto Katsumi , Shibuya Isao
Published: April 2006

The reaction of various heterocyclic cation compounds with I2/NH4OH resulted in ring expansion on nitrogen atom. The similar ring expansion reaction occurred on the corresponding triiodides with NH4OH. The reaction mechanism based on initial nucleophilic attack of NH3 on cations, subsequent oxidative iodination, and liberation of I− is proposed.
Structure Elucidation of “Hydroxycycloaraneosene” by Unambiguous Total Synthesis. An Eight-Membered Ring Formation via a Lewis Acid-Catalyzed Ene-Reaction
Authors: Kato Nobuo , Wu Xue , Tanaka Shinya , Takeshita Hitoshi
Published: April 2006

An improved eight-membered ring closure by means of a Lewis acid-catalyzed ene-reaction of an iridoid dimer produced a tricyclic derivative which was further converted to cycloaraneosene and its congener, “hydroxycycloaraneosene”. Total synthesis of the latter established its structure to be 8β-hydroxy derivative, not as the originally-proposed 9α-.
Can Hydrogen Atoms in Alkyl Group Interact with π-Electrons of Double Bonds ? Theoretical Study for the CH–π Interaction on Organic Molecules
Authors: Sakakibara Kazuhisa , Hirota Minoru
Published: April 2006

Theoretical study for the CH–π interaction, which is considered to be exerted between π-electrons of olefinic carbons and proximate hydrogen atoms in alkyl group, has been made by molecular mechanics and molecular orbital (ab initio and AM1) calculations for the model molecule 5-isopropyl(R)-2-methyl-1,3-cyclohexadiene.
Addition Reactions of Diazotropilidene with Monosubstituted Ethylenes Leading to 3-Substituted Indanones
Authors: Saito Katsuhiro , Takahashi Kensuke
Published: April 2006

Reactions of tropone tosylhydrazone sodium salt with monosubstituted ethylenes afforded 3-substituted indanones via dipolar additions of diazotropilidene to the ethylenes followed by rearrangements involving norcaradiene forms.
Electrochemical Polymerization of N-Trimethylsilylpyrrole and Characterization of the Resulting Conducting Polymer
Authors: Okano Mitsutoshi , Toda Atsuko , Mochida Kunio
Published: April 2006

A new conducting polymer was synthesized by electrochemical polymerization of N-trimethylsilylpyrrole. The polymer had good film producibility. The as grown film, which was in the doped state, showed conductivity of 5 × 101 S cm−1. The film showed three colors depending on the doping level, blue in the doped state, yellow in the undoped state, and reddish color in between.
Diazo-Coupling Reactions with Calix[4]arene. pKa Determination with Chromophoric Azocalix[4]arenes
Authors: Shinkai Seiji , Araki Koji , Shibata Jiro , Tsugawa Daisuke , Manabe Osamu
Published: April 2006

Six azocalix[4]arenes were synthesized for the first time by diazo-coupling reactions with calix[4]arene. The products showed unusual spectral properties including an azophenol–quinine–hydrazone tautomerism. Owing to the chromophoric nature, the four pKa’s for water-soluble p-(4-trimethylammoniopheylazo)calix[4]arene could be determined to be 0.5, 2.0, 10.0, and ca. 13. The marked pKa split was explained by the strong hydrogen-bonding interactions characteristic of calix[4]arene.
A Novel Interfacial Engine between Two Immiscible Liquids
Authors: Yamaguchi Tomohiko , Shinbo Toshio
Published: April 2006

A novel wave form of interfacial engine (a set of self-organized waves between two immiscible liquids) was observed by use of an aqueous solution of mixed surfactants (HTAB and dioctylsulfosuccinate).
Extraction of Organic Dianionic Species with Dicationic Extractants and Their Application to Anion Selective Electrode
Authors: Ohki Akira , Yamura Masanobu , Kumamoto Seishi , Maeda Shigeru , Takeshita Toshio , Takagi Makoto
Published: April 2006

Dicationic type anion-exchange extractants, CnBP, extracted organic dianionic species to a much greater degree as compared with classical monocationic extractants (Capriquat, etc.). This high extraction ability was applied to poly(vinyl chloride) (PVC) membrane electrode (coated-wire type). The electrode was found to be highly selective to 1,5-naphthalenedisulfonate anion (NDS2−).
Catalytic Activity of Perovskite-Type Oxides for the Direct Decomposition of Nitrogen Monoxide
Authors: Teraoka Yasutake , Fukuda Hisashi , Kagawa Shuichi
Published: April 2006

Perovskite-type oxides showed the catalytic activity for NO decomposition above 773 K, which depended largely on constituent metal cations and their composition. Results obtained indicate that perovskite-type oxides such as La0.8Sr0.2CoO3 are a promising NO decomposition catalyst having high activity and thermal stability at elevated temperatures.
Liquid Crystalline State in Hexakis[4-(4-cyano)biphenoxy]- and Hexakis[4-(phenylazo)phenoxy]cyclotriphosphazenes
Authors: Moriya Keiichi , Yano Shinichi , Kajiwara Meisetsu
Published: April 2006

We synthesized hexakis[4-(4-cyano)biphenoxy]cyclotriphosphazene(HCBCTP) and hexakis[4-(phenylazo)phenoxy]cyclotriphosphazene(HPAPCTP) and found a nematic phase between 529 and 488 K in the cooling process of HCBCTP by DSC measurements and polarizing microscope observations, but no mesomorphic state was found in HPAPCTP.
A New Class of S-Bridged Polynuclear Complex. The Formation and Crystal Structure of Spontaneously Resolved [{Rh(aet)3}4Zn3O]4+ (aet = 2-aminoethanethiolate)
Authors: Konno Takumi , Okamoto Ken-ichi , Hidaka Jinsai
Published: April 2006

Reaction of fac(S)-[Rh(aet)3] with Zn2+ in water gave spontaneously resolved [{Rh(aet)3}4Zn3O]4+ (aet = 2-aminoethanethiolate), of which structure and absolute configuration have been determined by X-ray crystallographic method. In the isomer each Zn(II) is tetrahedrally coordinated by three thiolato atoms from three different Λ-fac(S)-[Rh(aet)3] and a central oxygen atom.
Bilayer Membranes of Amphiphilic Crown Ethers with Amino Acid Residue
Authors: Furusawa Kunio , Obata Chiharu , Matsumura Hideo , Takeuchi Motoharu , Kuwamura Tsunehiko
Published: April 2006

An amphiphilic crown ether (5) with amino acid residues and two long hydrocarbon chains(2C12) was synthesized and the membrane(vesicle) properties of 5 were examined. 5 spontaneously formed a stable bilayer membrane and gave uniform single unilamellar vesicles(SUV). The resulting SUV showed strong retaining power related to the release of a trapped fluorescent marker and a highly selective complexing ability for specific metal cations.