bluuebunny/crossref_metadata_2025 huggingface dataset:
Activation and Orientation by Receptor-Substrate Binding. The Case of Acyl Transfer from O-Acetylhydroxylamine
Authors: Lehn Jean-Marie , Nishiya Takako
Published: July 2006

The strong binding ability of the receptor molecule 1 induces complexation of O-acetylhydroxylamine and of hydroxylamine in their protonated forms ; as a result, subsequent reaction of bound CH3COONH3+ becomes fast and selective, giving only acetic acid with a rate enhancement by a factor of about 30.
Benzopentathiepin as Sulfurization Reagent. Novel Synthesis of Thiosulfonates from Sulfinates
Authors: Sato Ryu , Akutsu Yasuo , Goto Takehiko , Saito Minoru
Published: July 2006

Sodium alkane- and arenesulfinates were readily sulfurized with benzopentathiepin in usual organic solvents at room temperature to give corresponding thiosulfonates in good yields.
Effect of Silyl Substituent on Thermal Isomerization of Allene Episulfide. A New Aspect in Thioxyallyl Intermediate
Authors: Tokitoh Norihiro , Choi Nami , Ando Wataru
Published: July 2006

Kinetic studies on the thermal isomerization of 1,1-bis(trimethylsilyl)-3,3-diphenylallene 2-episulfide showed an attractive accelerating effect of silyl substituents attributable to the partial ionic nature of thioxyallyl intermediate.
On the Stereochemistry of E′- and E′-Reactions
Authors: Vogel Ernst , Caravatti Giorgio , Franck Peter , Aristoff Paul , Moody Christopher , Becker Anna-Maria , Felix Dorothee , Eschenmoser Albert
Published: July 2006

The decarboxylative E′-dehydration of β,γ-unsaturated δ-hydroxy acids with DMF-dineopentylacetal shows SYN-faciality irrespective of whether the conformation of the hydroxy group relative to the double bond axis is anticlinal or synclinal.
Carbon–Carbon Bond Formation by Cross Coupling of Enol Phosphates or Enol Triflates with Organomanganese Compounds
Authors: Fugami Keigo , Oshima Koichiro , Utimoto Kiitiro
Published: July 2006

Trialkylmanganese-mediated alkylation of enol phosphates is performed in the presence of a catalytic amount of Pd(PPh3)4. The cross coupling reaction catalyzed by Li2MnCl4 between enol triflates and Grignard reagents is also described.
Litophynin A and B, Two New Insect Growth Inhibitory Diterpenoids from the Soft Coral Litophyton sp.
Authors: Ochi Masamitsu , Futatsugi Kensuke , Kotsuki Hiyoshizo , Ishii Masahiro , Shibata Kozo
Published: July 2006

Two new diterpenoids, litophynin A and B, which exhibit insect growth inhibitory activity against the silkworm, Bombyx mori L., have been isolated from the soft coral Litophyton sp. Their structures have been fully characterized by extensive 2D NMR studies and molecular mechanics calculations.
Generation of the Dianion from Tetrasilabicyclo[1.1.0]butane Derivatives
Authors: Kawase Takeshi , Batcheller Scott A , Masamune Satoru
Published: July 2006

Reductive cyclization of R2ClSi–SiCl2R′ with 5 equiv. of lithium naphthalenide followed by aqueous workup provides the corresponding cyclotetrasilane [(R2SiSiHR′)2]. Similar treatment converts RCl2SiSiClHR into a stereoisomeric mixture of cyclotetrasilanes [(RHSi)4]. Evidence is presented to indicate that the tetrasilabicyclo[1.1.0]butane derivatives formed as intermediates in these reactions are transformed into the dianions corresponding to the products.
Vapor-phase Nitration of Benzene over Silica-supported Benzenesulfonic Acid Catalyst
Authors: Suzuki Eiichi , Tohmori Kunihiko , Ono Yoshio
Published: July 2006

Silica-supported benzenesulfonic acid has a high catalyst activity for the title reaction. A nitrobenzene yield on benzene basis and on nitrogen dioxide basis attained to 93% and 70%, respectively, at 443 K under partial pressures of benzene and nitrogen dioxide of 9.3 kPa and 19 kPa, respectively.
TPD Detection of Hydrogen Absorbed in GaAs during Electrochemical Hydrogen Evolution Reaction
Authors: Kaneko Susumu , Uosaki Kohei , Kita Hideaki
Published: July 2006

Temperature programmed desorption (TPD) technique was employed to detect hydrogen absorbed in n-GaAs during electrochemical hydrogen evolution reaction (HER). It was found that 5.63×1015 atom cm−2 of D atom which is equivalent to 10 monolayers adsorption was absorbed in GaAs after HER for 12 h at −1.5 V (vs. Ag/AgCl) in 0.5 M D2SO4/D2O.
Selective Production of C4–C10 Hydrocarbons in Hydrogenation of Carbon Monoxide over Ruthenium Supported on Al2O3-Intercalated Montmorillonite
Authors: Mori Hiroo , Okuhara Toshio , Misono Makoto
Published: July 2006

C4 to C10 hydrocarbons (main fractions of gasoline) were selectively produced by hydrogenation of CO over Ru supported on Al2O3-intercalated montmorillonite, presumably due to shape-selective secondary reactions of hydrocarbons in the pores of the support.
Synthesis of Polyorganosiloxane with N-(4-Pyridyl)amido Group on the Side Chain
Authors: Ohyanagi Manshi , Nishide Hiroyuki , Suenaga Koichi , Tsuchida Eishun
Published: July 2006

Poly(3-carboxypropylmethylsiloxane) reacts with thionyl chloride and forms acid chloride without significant decomposition. Transparent polyorganosiloxane with N-(4-pyridyl)amido group on the side chain is easily synthesized by polymer reaction of the acid chloride and 4-aminopyridine.
New Electron Acceptors of Condensed-Thiophene TCNQ Type
Authors: Yui Koji , Ishida Hideki , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Two conjugated homologues of thiophene-TCNQ, i.e., 2,5-bis(dicyanomethylene)-2,5-dihydrothieno [3,2-b ] thiophene and 2,6-bis(dicyanomethylene)-2,6-dihydrodithieno[3,2-b:2′,3′-d]thiophene have been prepared as potential acceptors. They form charge-transfer complexes with TTF or TTT as well as complex sodium or tetrabutylammonium salts, some of which are highly conducting.
Intramolecular Energy Transfer in Covalently Linked Ruthenium(II)/Osmium(II) Binuclear Complex. Ru(II)bpy2Mebpy-CH2CH(OH)CH2-MebpyOs(II)bpy2
Authors: Furue Masaoki , Kinoshita Shuichi
Published: July 2006

A novel polypyridine ruthenium(II)/osmium(II) heterobinuclear complex (2) was synthesized. The luminescence properties of 2 were compared with those of its component complex. In 2, the efficient intramolecular energy transfer from excited Ru(II) to Os(II) complex was observed and interpreted by Foerster mechanism.
A New Synthesis of γ-Lactones with α,β-Fused Ring Systems Using α-Diethoxyphosphinyl-Δα,β-butenolides
Authors: Minami Toru , Watanabe Kazushi , Chikugo Tsuguhiko , Kitajima Yoshiyuki
Published: July 2006

The intramolecular Wittig–Horner reaction of α-diethoxyphosphinyl-Δα,β-butenolides with various nucleophilic reagents containing the carbonyl group produced α,β-carbocyclic fused-γ-lactones in moderate yields.
Reaction of 6-Oxa-3-silabicyclo[3.1.0]hexanes with Phosphinimines. Synthesis of 6-Vinyl-1,3-dioxa-2,4-disilacyclohexanes
Authors: Baceiredo Antoine , Juengst Clifford D , Manuel Georges , Weber William P
Published: July 2006

Reaction of 3,3-dimethyl-6-oxa-3-silabicyclo[3.1.0]-hexane with N-benzyltriphenylphosphinimine yields 1,3-butadiene and 2,2,4,4-tetramethyl-6-vinyl-l,3-dioxa-2,4-disilacyclohexane (3). A mechanism for the formation of 3 which involves the reaction of dimethylsilanone [(CH3)2Si=0] with 2,2-dimethyl-4-vinylsilaoxetane is proposed.
Heterogeneous Water Oxidation by a Dinuclear Manganese Complex
Authors: Ramaraj Ramasamy , Kira Akira , Kaneko Masao
Published: July 2006

The di-μ-oxo-tetrakis(2,2′-bipyridine)dimanganese complex was used as a heterogeneous phase catalyst for water oxidation by adsorbing into Kaolin clay. The oxygen evolved was analyzed by gas chromatography and mass spectrometry. The water oxidation reaction involving the four-electron process in a heterogeneous phase was discussed.
One-step Synthesis of Fulgides by Palladium-catalyzed Carbonylation of Substituted 2-Butyne-1,4-diols
Authors: Kiji Jitsuo , Konishi Hisatoshi , Okano Tamon , Kometani Shinji , Iwasa Akio
Published: July 2006

The reaction of carbon monoxide with substituted 2-butyne-1,4-diols by pd(OAc)2/I2 catalyst gives derivatives of dimethylenesuccinic anhydride, “fulgides”, in high yields.
A Solid-State Proton Conductor Sensor with an Ammonia Sensitivity at Room Temperature
Authors: Miura Norio , Worrell Wayne L
Published: July 2006

A new type of solid-state gas sensor using proton conductor (antimonic acid) is proposed for detecting small amounts of NH3 in air at room temperature. The sensor element has a four-probes type structure with outer two pt electrodes and inner two Ag probes. The sensor response was found to vary with the NH3 concentration (from 50 ppm to 5030 ppm) in air.
An Entry to 5-(1-Alkenyl)-3(2H)-furanones through Cycloaddition of Phosphorus-Functionalized Nitrile Oxide to Acetylene Alcohols. An Effective Synthesis of Geiparvarin
Authors: Tsuge Otohiko , Kanemasa Shuji , Suga Hiroyuki
Published: July 2006

Cycloaddition of α-(diethoxyphosphoryl)acetonitrile oxide to acetylene alcohols is followed by an alkylation, a reductive cleavage of the N–O bond, and an acid-catalyzed cyclization to form 5-(diethoxyphosphorylmethyl)-3(2H)-furanones in good yields. Subsequent Horner-Emmons olefination using triethylamine and lithium bromide furnishes E-isomers of 5-(1-alkenyl)-3(2H)-furanones as major products. This method has been applied to a short synthesis of Geiparvarin.
Asymmetric Synthesis of the Both Enantiomers of Tertiary Aryl Homoallyl Alcohols and Diols by Diastereoselective Addition of Allyltrimethylsilane to Chiral α-Keto Imides
Authors: Soai Kenso , Ishizaki Miyuki , Yokoyama Shuji
Published: July 2006

Both enantiomers of homoallyl-alcohols and -diols are obtained in high enantiomeric excesses (91–>98% e.e.) by titanium tetrachloride promoted diastereoselective addition of allyltrimethylsilane to chiral α-keto imides.
Fixation of Molecular Nitrogen Using Aliphatic Carboxylic Acid by Nitrogen Arc Plasma. Formation of Amino Acids
Authors: Takasaki Michiaki , Harada Kaoru
Published: July 2006

When argon-nitrogen plasma was blown into an aqueous solution containing aliphatic carboxylic acids, formation of several amino acids and amines was identified.
Highly Efficient Asymmetric Esterification of Cyclic meso-Dicarboxylic Anhydrides Catalyzed by Diphenylboryl Triflate
Authors: Ohshima Masahiro , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of diphenylboryl triflate, cyclic meso-dicarboxylic anhydrides are esterified by diphenylboric ester of (R)-2-methoxy-1-phenylethanol in a highly stereoselective manner, and, after the treatment with diazomethane, the chiral diesters are obtained with high diastereomeric excess.
Directing Effects of a Silyl Group on Cationic Rearrangement Reactions
Authors: Tanino Keiji , Hatanaka Yasuo , Kuwajima Isao
Published: July 2006

In the reaction of 3-(trimethylsilyl)methylcyclohexyl mesylates with dimethylaluminium triflate, the silyl group has a remarkable effect to induce successive rearrangements of a hydride and an alkyl group so as to form a stable β-silyl cationic species which finally afford the corresponding olefins.
An Asymmetric Transformation of Symmetrical Epoxides to Both Enantiomers of Allylic Alcohols by Chiral Lithium Amides
Authors: Asami Masatoshi , Kirihara Hiroto
Published: July 2006

Both enantiomers of several optically active allylic alcohols are obtained from cyclic and acyclic symmetrical epoxides by using chiral lithium amides, i.e., lithium cyclohexyl[(S)-1-ethylpyrrolidin-2-yl]methylamide or lithium (S)-2-[(pyrrolidin-1-yl)methyl]pyrrolidide, as bases.
The Synthesis and Properties of Three Isomers of 1-Troponyl-1H-1,2-diazepine
Authors: Miyano Hiroyuki , Nitta Makoto
Published: July 2006

The substitution reaction of 2-halotropones or 2-tosyloxytropone with tricarbonyl(4-7-η-1H-1,2-diazepine)iron afforded three isomers of tricarbonyl(4-7-η-1-troponyl-1H-1,2-diazepine)iron in good combined yield: three complexes were decomplexed to novel three isomers of 1-troponyl-1H-1,2-diazepine.
Novel Gold Catalysts for the Oxidation of Carbon Monoxide at a Temperature far Below 0 °C
Authors: Haruta Masatake , Kobayashi Tetsuhiko , Sano Hiroshi , Yamada Nobumasa
Published: July 2006

A variety of gold catalysts can be used to catalyze the oxidation of carbon monoxide at temperatures as low as −70 °C and are stable in a moistened gas atmosphere. The novel catalysts, prepared by coprecipitation, are composed of ultra-fine gold particles and one of the oxides of 3d transition metals of group VIII, namely, Fe, Co, and Ni.
Boron Phosphate as a Highly Active Catalyst for 1-Decene Oligomerization
Authors: Tada Akio , Suzuka Hiroyasu , Imizu Yuzo
Published: July 2006

The oligomerization of 1-decene was studied over six kinds of solid acid catalysts involving boron phosphate. Among them evacuated boron phosphate exhibited the highest oligomerization activity: superior to not only SiO2–Al2O3 but also a solid superacid, SO42−/ZrO2.
New High Temperature Superconducting Oxides. (La1−xSrx)2CuO4−δ and (La1−xCax)2CuO4−δ
Authors: Kishio Kohji , Kitazawa Koichi , Kanbe Shinsaku , Yasuda Isamu , Sugii Nobuyuki , Takagi Hidenori , Uchida Shin-ichi , Fueki Kazuo , Tanaka Shoji
Published: July 2006

Solid solution systems of (La1−xSrx)2CuO4−δ and (La1−xCax)2CuO4−δ with x=0.05, 0.075, and 0.10 were found to exhibit the superconductivity through a.c. magnetic susceptibility and electrical resistivity measurements. The onset critical temperature for (La0.90Sr0.10)2CuO4−δ was 37 K, the highest among all the superconducting materials ever known, while that for (La0.95Ca0.05)2CuO4−δ was 18 K.
Determination of the Absolute Configuration of u-fac-[Co(ida)(mdien)]+ by 1H NMR Spectroscopy
Authors: Ama Tomoharu , Kaizaki Sumio , Kawaguchi Hiroshi , Yasui Takaji
Published: July 2006

Iminodiacetic acid containing asymmetric carbon with S chirality (H2ida(Cs); HOOCCH2NHC*HDCOOH) was prepared by stereospecific deuteration of (−)563CD-mer(O)cis(Nc)-[Co(ida)(edma)]. Using this H2ida(Cs), u-fac-[Co(ida(Cs))(mdien)]+ was prepared and optically resolved. On the basis of the 1H NMR spectra of the chelating ida(Cs), the absolute configuration of the (−)550CD isomer was assigned to ΔΛΔ.
Enantioselectivity in the Biotransformation of Bicyclo[3.1.1]heptanes with the Cultured Cells of Nicotiana tabacum
Authors: Suga Takayuki , Hamada Hiroki , Hirata Toshifumi
Published: July 2006

The biotransformation of the enantiomeric pairs of bicyclo[3.1.1]heptane derivatives with the cultured cells of Nicotiana tabacum was investigated. The hydrogenation of the C–C double bond of verbenone took place enantioselectively in preference of the (1S,5S)-enantiomer and the hydrogen attack occurred stereospecifically from the re-face at its C-2. The oxidation of the hydroxyl group of neoisopinocampheol occurred enantioselectively in preference of the (1S,2S,3R,5R)-enantiomer, whereas such an enantioselective oxidation was not the case for neoisoverbanol.
Synthesis of 2a-Substituted Dichlorocyclobuta[c]quinolin-3-one and 3-(Trichloroethenyl)-2-quinolone through the Cross Photocycloadduct of 2-Quinolone and Tetrachloroethylene
Authors: Nonoyama Shinji , Yonezawa Noriyuki , Saigo Kazuhiko , Hirano Tsuneo , Hasegawa Masaki
Published: July 2006

2a-Substituted dichlorocyclobuta[c]quinolin-3-one was obtained from the cross photocycloadduct of 2-quinolone and tetrachloroethylene by the reaction with bases or nucleophiles via cyclobutene formation and intermolecular SN2′ displacement along with trichloroethenyl-2-quinolone via [2+2] cycloreversion of the cyclobutene intermediate.
C-Alkylation of Phenyithio Aziridine Carboxylates
Authors: Seebach Dieter , Haner Robert
Published: July 2006

The N-t-butyl and N-benzyl aziridine carboxylic acid phenylthiol esters are deprotonated in the α-carbonyl position and alkylated by alkyl halides, by aldehydes, and by nitrostyrene. The diastereoselectivities in the additions to trigonal centers range from 72 to 88% (rel. topicity lk with benzaldehyde).
A 13C NMR Study of 1,4-Diphenyl- and 1,1,4,4-Tetraphenyl-1,3-butadiene Dianions
Authors: Yokoyama Yukihiro , Takahashi Kensuke
Published: July 2006

Lithium, sodium, and potassium salts of the title dianions were investigated by means of 13C NMR spectroscopy in THF or DME at room temperature. The structures of the butadiene carbon skeleton and especially the behaviors of the α- and β-carbons caused by the conversion of the precursors into the dianions were reported together with the counter-cation effects.
Raman Spectra of the Adducts of Reduced Species of [Fe4S4(SPh)4]2− and [Mo2Fe6S8(SPh)9]3− with Acetylene
Authors: Tanaka Koji , Nakamoto Masami , Tsunomori Michito , Tanaka Toshio
Published: July 2006

Reduced species of [Fe4S4(SPh)4]2− and [Mo2Fe6S8(SPh)9]3− form adducts with acetylene (C2H2 or C2D2) in dry CH3CN with liberating a terminal PhS− ligand. The ν(C≡C) Raman band undergoes 45 to 70 cm−1 low frequency shifts upon coordination of acetylene to the clusters.
Optical Resolution by Preferential Crystallization of Dl-Thiazolidine-4-carboxylic Acid
Authors: Shiraiwa Tadashi , Sado Yujin , Komure Masamitsu , Kurokawa Hidemoto
Published: July 2006

It was found that Dl-thiazolidine-4-carboxylic acid (Dl-THC) is a conglomerate. A successive preferential crystallization in water gave d- and l-THC’s with optical purity of 96–100%. d- and l-cysteines with 100% optical purity were obtained from the purified d- and l-THC’s, respectively.
Electrochemical Oxidation of 1-Phenylthio-1-trimethylsilylalkanes
Authors: Yoshida Jun-ichi , Isoe Sachihiko
Published: July 2006

Electrochemical oxidation of 1-phenylthio-1-trimethylsilylalkanes in the presence of alcohol resulted in facile cleavage of the carbon–silicon bond and formation of the corresponding acetals.
High-Tc Superconducting Oxide Solid Solutions (La1−x(Ba,Sr,Ca)x)2CuO4−δ
Authors: Kishio Kohji , Kitazawa Koichi , Sugii Nobuyuki , Kanbe Shinsaku , Fueki Kazuo , Takagi Hidenori , Tanaka Shoji
Published: July 2006

The system (La1−x(Ba,Sr,Ca)x)2CuO4−δ with x=0.1 has been found to be a high temperature superconducting phase in the entire compositional range of the three alkali earth cations. (La0.9Sr0.1)2CuO4−δ, displayed the highest critical temperature and the shortest distance for Cu–O bonds within the basal layer plane of the K2NiF4-type crystal structure, suggesting the two-dimensional nature of the conduction mechanism.
Regioselective Alkylation of Vinylogous N-Acyliminium Ion, Leading to 6-Alkyl-1,2,3,6-tetrahydropyridines, by Using Electrogenerated Acid (EG acid) as a Catalyst
Authors: Torii Sigeru , Inokuchi Tsutomu , Takagishi Sadahito , Akahoshi Fumihiko , Uneyama Kenji
Published: July 2006

Alkylation of 6-methoxy-1,2,3,6-tetrahydro- and 4-methoxy-1,2,3,4-tetrahydropyridines with organo-silicon compounds as a carbon nucleophile by using electrogenerated acid as an acid catalyst proceeds regioselectively at the C-6 position via vinylogous acyliminium ion, while sulfenylation and methoxylation occurs at the C-4 position.
Kinetic Isotope Effect and Substituent Effect Study on the Grignard Reaction of MeMgI with Benzophenone. A Rate-Determining C–C Bond Formation
Authors: Yamataka Hiroshi , Matsuyama Toyoki , Hanafusa Terukiyo
Published: July 2006

The carbonyl carbon-14 kinetic isotope effect and substituent effects were determined for the reaction of MeMgI with benzophenone. The observed large carbon isotope effect (14k⁄12k=1.056) together with the large steric effect on reactivity introduced by o-substituents on benzophenone indicated that the C–C bond formation is the rate-determining step of the Grignard reaction.
Characterization of a Simple Vitamin B12 Model Complex and Its Catalysis in Electrochemical Carbon-Skeleton Rearrangement
Authors: Murakami Yukito , Hisaeda Yoshio , Fan Sheng-Di
Published: July 2006

The electrochemical carbon-skeleton rearrangement reaction of 2,2-bis(ethoxycarbonyl)-1-bromopropane was catalyzed by the cobalt complex of 2,10-diethyl-3,9-dipropyl-1,4,8,11-tetraazaundeca-1,3,8,10-tetraene-1,10-diol, which was characterized by ESR spectroscopy and cyclic voltammetry.
Molecular Structure of the Inclusion Complex of 5-[Perfluoro(2-isopropyl-1,3-dimethyl-1-butenyl)oxy]isophthalic Acid with Ethanol
Authors: Tomoda Hideyuki , Nemoto Fujito , Ohya-Nishiguchi Hiroaki , Yamamoto Noriko , Taga Tooru
Published: July 2006

Title compound has been found to form a 2:2 crystalline inclusion complex with ethanol, and X-ray crystal structure of the complex was determined. In the structure of the complex, four intermolecular hydrogen bonds are involved between the two host and two guest molecules. By using the complexation, extraction of ethanol from aqueous solution is demonstrated.
Preparation of Perovskite-type Oxides with Large Surface Area by Citrate Process
Authors: Zhang Hua-Min , Teraoka Yasutake , Yamazoe Noboru
Published: July 2006

Well-crystallized perovskite-type oxides could be synthesized at temperatures as low as 550–650 °C by the calcination of amorphous citrate complex precursors. The large specific surface areas of the oxides obtained suggest that the citrate process is very promising for preparing perovskite-type oxide catalysts for practical use.
Allylation of Imines with in situ Generated Allyl Lead Reagents in a PbBr2/Al/BF3·OEt2/Et2O System
Authors: Tanaka Hideo , Yamashita Shiro , Ikemoto Youichi , Torii Sigeru
Published: July 2006

Reductive addition of allyl bromide to imines has been performed with a combination of a catalytic amount of PbBr2 (0.03–0.1 equiv.) and Al (1 equiv.) in Et2O containing BF3·OEt2 (1.1 equiv).
Useful Synthesis of α-Aminonitriles by Means of Alumina and Ultrasound
Authors: Hanafusa Terukiyo , Ichihara Junko , Ashida Tetsuya
Published: July 2006

Combined use of alumina and ultrasound facilitates the synthesis of α-aminonitriles under solid–liquid two phase conditions from carbonyl compounds, salts of amines and potassium cyanide in organic solvents.
Total Synthesis of (−)-Anisomycin
Authors: Shono Tatsuya , Kise Naoki
Published: July 2006

Antibiotic (−)-anisomycin was synthesized starting from d-tyrosine using the addition of electrogenerated dichloro(methoxycarbonyl)methyl anion to aldehyde 2 as a key reaction.
A Novel Aspect in Chlorination of d-Glucal Derivatives. Important Roles of the 4,6-O-Benzylidene Group and Substituent at C-3 in the Selective Formation of β-d-Manno and β-d-Arabino Isomers
Authors: Sakakibara Tohru , Yatabe Takumi , Yoshino Kohji , Ishido Yoshiharu
Published: July 2006

In contrast with the precedent reports described in peracetyl-and perbenzyl-d-glucal, chlorination of 3-O-acetyl- and 3-deoxy-4,6-O-benzylidene-d-glucal in carbon tetrachloride predominantly occurred from the β-side to give the β-d-manno and β-d-arabino adducts, respectively.
Cyclization of Type II Diradicals from 3-Alkoxy-1,2-naphthoquinones. Photochemical Transformation of an Alkoxyl Group into a Methylenedioxy Group
Authors: Takuwa Akio , Soga Osamu , Itoh Mitsumi , Maruyama Kazuhiro
Published: July 2006

Photo-induced intramolecular hydrogen abstraction of 3-alkoxy-1,2-naphthoquinones afforded methylenedioxy compounds. The efficiency of the reactions was strongly affected by introducing a substituent at the position 4 of the quinones.
Mechanism of Asymmetric Polymerization of Triphenylmethyl Methacrylate, Separation and Optical Resolution of Oligomers
Authors: Okamoto Yoshio , Yashima Eiji , Nakano Tamaki , Hatada Koichi
Published: July 2006

Asymmetric oligomerization of triphenylmethyl methacrylate (TrMA) was carried out with (−)-sparteine-fluorenyllithium complex in toluene at −78 °C and the oligomers of methyl methacrylate (DP=2 and 3) derived therefrom were separated into diastereomers and optical isomers on silica gel and chiral HPLC columns, respectively. On the basis of the obtained data, the mechanism of asymmetric polymerization of TrMA was discussed.
The pH-Sensitive Conversion of Molecular Aggregates of Rhamnolipid Biosurfactant
Authors: Ishigami Yutaka , Gama Yasuo , Nagahora Hitoshi , Yamaguchi Muneo , Nakahara Hisae , Kamata Toshio
Published: July 2006

Rhamnolipid B and its precursor A, both microbial and membranous constituent, reversibly changed morphologies of their molecular aggregates from vesicles under acidic conditions, to lamella, lipid particles, and finally to micelles under weakly acidic conditions within a narrow pH range of about 5–7.
Oxidative Coupling of Methane over BaO Mixed with CaO and MgO
Authors: Yamagata Nobutsugu , Tanaka Katsutoshi , Sasaki Shoichi , Okazaki Susumu
Published: July 2006

Various metal oxides mixed with BaO were studied as a catalyst for coupling of methane. For example, a BaO–CaO catalyst shows a high activity (20.9 mmol h−1g−1) for the C2 formation (C2H6+C2H4) with a high C2 selectivity(61.1%) under the following conditions; 1073 K, P(CH4) = 40 kPa, a ratio of CH4 to O2 = 5.0, and W/F = 3.39 g h mol−1.
Reactions of (2S)-1-Arenesulfonyl-2-alkanol Dianions with Aldehydes, Application to the Synthesis of Enantiomerically Pure (3S)-1-Alken-3-ols and (2E,4S)-4-Hydroxy-2-alkenenitriles
Authors: Tanikaga Rikuhei , Hosoya Ken , Kaji Aritsune
Published: July 2006

Enantiomerically pure (2S)-1-arenesulfonyl-2-alkanols (1) were prepared by yeast reduction of 1-arenesulfonyl-3-chloro-2-propanones, followed by epoxydation and alkylation. Reaction of dianions of 1 with aldehydes occurred at the Pro (R) position of C(1) to give 1,3-diols, which were converted to (3S)-1-alken-3-ols or (2S,4S)-4-hydroxy-2-alkenenitriles in 100% e.e.
Substituent Effects on the Populations of Rotational Isomers in 9-Benzyl-8,13-dichloro-1-methyltriptycenes. Evidence for the Presence of CH3···π Interactions
Authors: Nakai Yasufumi , Yamamoto Gaku , Oki Michinori
Published: July 2006

Examination of population ratios, ±sc/ap, in substituted 9-benzyl-8,13-dichloro-1-methyltriptycene derivatives by 1H NMR spectroscopy has shown that the ratio becomes larger as the substituent in the benzyl group is more electron-donating and as that in the benzeno bridge which bears the 1-methyl group is more electron-withdrawing. The results are interpreted as indicating the presence of CH3···π interactions.
An Interpretation of the Puzzling Dichotomy of the Reaction Modes Observed during the Side-chain Nitration of Alkylaromatics with HNO3/CH2Cl2 and HNO3/(CH3CO)2O
Authors: Suzuki Hitomi , Koide Hideki , Taki Yukiko , Ohbayashi Eiichi , Ogawa Takuji
Published: July 2006

Nitration of substituted pentamethylbenzenes has been carried out under various conditions using the title nitrating systems in order to elucidate the peculiar dependence of the modes of side-chain substitution on the reagent employed; nitrooxylation with HNO3/CH2Cl2 and nitration with HNO3/(CH3CO)2O. Based on the evidence obtained from product variations with substituents, electrochemical nitrodecarboxylation of arylacetates, and ESR examination of the initial stage of the side-chain reactions, a proposal is made that the side-chain substitution of polysubstituted arenes occurs via a heterolytic path with HNO3/CH2Cl2 and via a homolytic path with HNO3/(CH3CO)2O.
Promotion Effect of Hydrogen on Vapor Phase Carbonylation of Methanol over Nickel on Active Carbon Catalyst
Authors: Fujimoto Kaoru , Mazaki Hitoshi , Omata Kohji , Tominaga Hiro-o
Published: July 2006

In the vapor phase carbonylation of methanol by carbon monoxide on a nickel on active carbon catalyst, co-existence of hydrogen greatly enhanced the rate of acetic acid production but with a slight increase in methane formation.
Asymmetric Induction in 1,3-Dipolar Cycloaddition of Diazofluorene with Menthyl or 8-Phenylmenthyl Acrylate and Fumarate Derivatives
Authors: Okada Keiji , Samizo Fumio , Oda Masaji
Published: July 2006

Optical yields in the 1,3-dipolar cycloaddition of diazofluorene with chiral acrylate or fumarate derivatives were found to be considerably improved by use of Corey’s 8-phenylmenthyl group as a chiral O-alkyl group in these esters. The absolute stereochemistry of resulting cyclopropanes is different from the one expected from the “diazo-exchange” mechanism proposed by Walborsky et al.
Crystal Structure of a 1 : 1 Complex of 1,3-Bis(8-quinolyloxy)propane and Lithium Perchlorate
Authors: Ueno Katsuhiko , Hiratani Kazuhisa , Taguchi Kazuhiro , Okada Tatsuhiro , Sugihara Hideki
Published: July 2006

1,3-Bis(8-quinolyloxy)prppane, which exhibits highly lithium ion-selective transport through liquid membrane, forms a 1 : 1 complex with lithium perchlorate. The X-ray analysis of this complex revealed that lithium ion is pentacoordinated in a nearly square pyramidal geometry.
Gobalt(II) Chloride Catalysed Acylative Cleavage of Ethers
Authors: Ahmad Saeed , Iqbal Javed
Published: July 2006

In the presence of catalytic amount of cobalt(II) chloride in acetonitrile, a wide variety of ethers are cleaved with acyl chlorides to the corresponding esters in good to excellent yield.
Synthesis of Enkephalin Analog with Leucinthiol at C-Terminus as Probe for Thiol Group in Opiate Receptors
Authors: Kondo Michio , Uchida Hiroaki , Kodama Hiroaki , Kitajima Hiroshi , Shimohigashi Yasuyuki
Published: July 2006

Enkephalin analog with thiol group at C-terminus, [D-Ala2, Leu(CH2SH)5]enkephalin, was synthesized as possible probe for the essential thiol group in opiate receptors. In order to protect the free SH group of leucinthiol, oxidized Boc-l-leucinthiol dimer was prepared from l-leucinol (2-amino-4-methyl-1-pentanol) to elongate the enkephalin sequence. SH-Containing monomeric enkephalin analog was obtained from dimer by treatment with zinc in 50% AcOH, and it exhibited a high affinity for mu opiate receptors.
cis–trans Isomerization of the Azobenzenes Included as Guests in Langmuir–Blodgett Films of Amphiphilic β-Cyclodextrin
Authors: Yabe Akira , Kawabata Yasujiro , Niino Hiroyuki , Tanaka Motoo , Ouchi Akihiko , Takahashi Hisao , Tamura Shoji , Tagaki Waichiro , Nakahara Hiroo , Fukuda Kiyoshige
Published: July 2006

Azobenzenes in the host–guest Langmuir–Blodgett films prepared with amphiphilic β-cyclodextrin and azobenzene derivatives showed a photochromic behavior with complete reversibility owing to the free volume of cyclodextrin cavity, whereas the trans-to-cis isomerization was restricted in the case of the pure LB film prepared with long-chain azobenzene derivative alone. Thermal cis-to-trans isomerizations in the LB films were also studied.
14,16-Bridged 16-Crown-5. Drastic Enhancement in Cation-Binding Ability
Authors: Inoue Yoshihisa , Wada Kazuhito , Ouchi Mikio , Tai Akira , Hakushi Tadao
Published: July 2006

14,16-Bridged 16-crown-5 derivatives possess unusually high cation-binding abilities for most cations, maintaining the original relative cation-selectivity for Na+ and Ag+, for which the fixed conformation is responsible.
Effects of the Halogen Substituents on the Valence State of Iron Atoms in Some Mixed-valence Dihalobiferrocenes
Authors: Kai Masahiro , Motoyama Izumi , Katada Motomi , Masuda Yuichi , Sano Hirotoshi
Published: July 2006

The mixed-valence triiodide salts of 1′,1″-dihalobiferrocenes having two different kinds of halogen substituents were synthesized. Their 57Fe-Mössbauer spectra showed an averaged-valence state; i.e., one doublet even at 4.2 K, as found in the triiodide salts of 1′,1′″-dibromo- and 1′,1′″-diiodobiferrocenes.
Efficient Synthesis of Acyclic Nucleosides by N-Alkylation of Pyrimidine and Purine-bases Using a New Coupling Agent of Cesium Iodide
Authors: Kim Yong Hae , Kim Joong Young , Lee Chun Ho
Published: July 2006

Acyclic nucleosides, ((1,3-bis(benzyloxy)-2-propoxy) methyl)-2-thio-pyrimidine, -uracil, -2-thiouracil, and -2-thioadenine, and (2-acetoxyethoxy methyl)-2-thioadenine, -2-thiopyrimidine, -uracil, and -2-thiouracil have been successfully synthesized in good yields by N-alkylations of the bases with the corresponding alkyl-acetate (2) and -chloride (3) using cesium iodide under neutral condition in acetonitrile.
Alcyonin, a New Cladiellane Diterpene from the Soft Coral Sinularia flexibilis
Authors: Kusumi Takenori , Uchida Hideaki , Ishitsuka Midori O , Yamamoto Hiroshi , Kakisawa Hiroshi
Published: July 2006

The structure of alcyonin, a diterpene isolated from the soft coral Sinularia flexibilis has been determined by spectroscopic and chemical methods.
Photochemistry of Phenylpentamethyldigermane
Authors: Mochida Kunio , Kikkawa Haruhiko , Nakadaira Yasuhiro
Published: July 2006

Photolysis of phenylpentamethyldigermane afforded hydrogermanes and digermanes, as main products. These are derived from two germyl radicals generated by photo-induced homolysis of the germanium–germanium bond. Dimethylgermylene is shown to be evolved also on the photolysis.
The Regioselective Addition Reaction of 1,2-Benzoquinones with Silyl Enol Ethers Catalyzed by Trityl Perchlorate
Authors: Sagawa Yukihiro , Kobayashi Shu , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, 1,2-benzoquinones react with silyl enol ethers to produce the corresponding adducts, homoacyl-pyrocatechol derivatives, regioselectively in good yields.
Selective Conversion of m-Hydroxybenzyl Alcohol to m-Hydroxybenzaldehyde
Authors: Oi Ryu , Takenaka Shinji
Published: July 2006

Pt/C–CeCl3–Bi2(SO4)3 catalyst system in aqueous methanol has been found to be effective for the selective oxygen oxidation of m-hydroxybenzyl alcohol to m-hydroxybenzaldehyde.
Reactions of Phosphonium Ylides with S8 or Se in the Presence of Amines. Formation of Thioaldehydes or Selenoaldehydes
Authors: Okuma Kentaro , Komiya Yasuo , Ohta Hiroshi
Published: July 2006

The reaction of phosphonium ylides with elemental sulfur gave thioaldehydes which were successfully changed to corresponding thioamides when treated with secondary amines. On the other hand, the reaction of selenoaldehydes with secondary amines afforded bis(dialkylamino)methanes in good yields.
Biosynthesis of Cyclic Monoterpenoids. Involvement of Stereochemically Specified Linalyl Cation in the Cyclization of C10-Prenyl Chain
Authors: Suga Takayuki , Hirata Toshifumi , Izumi Shunsuke , Hiraga Yoshikazu , Okamoto Kazuki
Published: July 2006

Incubation of geranyl diphosphate (GPP) and the enantiomers and racemate of linalyl diphosphate (LPP) with the limonene synthetase isolated from Mentha spicata resulted in the conversion of GPP and (S)-LPP into (S)-limonene; this can be taken as evidence that linalyl cation having not only the (S)-LPP-like configuration but also C-1 and C-6 double bonds situated in the anti spatial arrangement is involved in the process of the cyclization of GPP to (S)-limonene. The intermediacy of the linalyl cation was supported by the evaluation of the potential energy of the cation with the MO calculation.
Electrochemical Detection of Polyamines Using Immobilized Enzyme as Post-Column Reactor in High Performance Liquid Chromatography
Authors: Watanabe Noriyuki , Asano Masao , Yamamoto Katsunobu , Nagatsu Toshiharu , Matsumoto Takatoshi , Fujita Keisuke
Published: July 2006

Novel detection method of biological polyamines was developed. Polyamine oxidase immobilized column worked as a post-column reactor, in which hydrogen peroxide was produced. Then, hydrogen peroxide was electrochemically detected on a platinum electrode placed in down stream. The detection limit at the sub-pico mole level was obtained.
Synthesis of a Conformationally Restricted Quinone-linked Porphyrin
Authors: Osuka Atsuhiro , Tomita Hiroaki , Maruyama Kazuhiro
Published: July 2006

A porphyrin-quinone model compound connected by spiro-indane spacer was synthesized. The fluorescence of the model exhibited a singly decaying component with a lifetime of 1.89 ns, from which the rate of intramolecular photo-induced electron transfer was estimated to be 4.3×108 s−1.
Crystal Structure and Physical Property of (BEDT-TTF)2(IBr2)2(1,1,2-Trichloroethane)0.5
Authors: Yamochi Hideki , Urayama Hatsumi , Saito Gunzi , Oshima Kokichi , Kawamoto Atsushi , Tanaka Jiro
Published: July 2006

The title complex which is isostructural to ε-(BEDT-TTF)2I3 (I8)0.5 changes its conducting property from semiconductive to metallic by tempering with the loss of its weight. This metallic state retains down to 0.5 K and this product is regarded as being different from α- and β-(BEDT-TTF)2IBr2.
Structure Study of Langmuir–Blodgett Films of Stearic Acid and Cadmium Stearate Deposited by Different Techniques
Authors: Kamata Toshihide , Umemura Junzo , Takenaka Tohru
Published: July 2006

Structure of LB films of stearic acid and cadmium stearate was studied by X-ray diffraction and infrared ATR methods. Stearic acid LB films prepared by the horizontal lifting method were mixtures of the A- and C-crystal forms, but those prepared by the vertical dipping method mainly consisted of the C-form. Cadmium stearate LB films gave X-ray diffraction peaks indicating the long spacing of 5.03 nm, irrespective of the deposition method.
New Type of Charge-Transfer Complexes between Benzoic Acid 2-[(3,5-Dibromo-4-hydroxyphenyl)-3,5-dibromo-4-oxo-2,5-cyclohexadiene-1-ylidene)methyl]-ethyl Ester (TBPE) and Aliphatic Amines
Authors: Nishimura Norio , Masaki Kazuko , Miyake Jun’ichi , Sakai Tadao
Published: July 2006

A study has been made of charge–transfer complexes formed between TBPE and aliphatic amines in nonpolar solvents. Large value of the equilibrium constant, large negative values of the heat of reaction as well as the reaction volume indicate that the complex of this type is very stable and the dative structure through hydrogen bonding is predominant.
Langmuir–Blodgett Films of Polyallylamine Modified with Long Perfluoroalkyl Chains by Urea Bonds. Novel LB Films of Highly Fluorinated Polymer
Authors: Tamura Masanori , Ishida Hiroyasu , Sekiya Akira
Published: July 2006

Long perfluoroalkyl chains were introduced to polyallylamine by urea bonds. Langmuir–Blodgett films of the polymers were successfully prepared even in the case of highly fluorinated polymer. Characterization of the films indicated that highly fluorinated polymer shows the unusually small limiting area and thick monolayer.
Solvent Extraction of Palladium(II) with N,N-Dioctylglycine from Chloride Media
Authors: Inoue Katsutoshi , Baba Yoshinari , Yoshizuka Kazuharu , Niheda Youichirou
Published: July 2006

Distribution equilibrium was investigated in the solvent extraction of palladium(II) from aqueous mixture of hydrochloric acid and sodium chloride with the title extractant in toluene at 303 K. Palladium(II) was found to be extracted as a chelate with the composition of 1:2 metal:reagent and the equilibrium constant of the extraction reaction was evaluated.
Evidence for the Formation of Emissive A–D–D′ Triplexes in Quenching of 1,4-Dicyanonaphthalene-Arene Exciplexes by Olefins
Authors: Masaki Yasuhiro , Yanagida Shozo , Pac Chyongjin
Published: July 2006

Evidence for the intervention of emissive triplexes has been presented for quenching of 1,4-dicyanonaphthalene-arene exciplexes by aromatic olefins. Chemical implications of the triplexes are discussed in relation with reactivities of olefins in geometric isomerization and dimerization reactions by charge transfer.
Enzymatic Preparation of Specifically Modified Linear Maltooligosaccharides through Taka-amylase A-catalyzed Hydrolysis of 6-O-Arenesulfonyl-γ-cyclodextrins
Authors: Fujita Kahee , Tahara Tsutomu , Imoto Taiji , Koga Toshitaka
Published: July 2006

6-O-Arenesulfonyl-γ-cyclodextrins were hydrolyzed enzymatically by Taka-amylase A to give 6″-O-arenesulfonylated maltotetraoses and 6″-O-arenesulfonylated maltotrioses.
Trapping of in situ Prepared Arylsulfenyl Isocyanates with Alcohols and Amines, Preparation of Arylsulfenylcarbamates and Arylsulf enylureas
Authors: Nagase Toshio , Akama Kazuhiro , Ozaki Shoichiro
Published: July 2006

Arylsulfenyl isocyanates, which were in situ prepared from arylsulfenyl chlorides and silver (or sodium) cyanate, reacted with alcohols and primary amines at carbon of the isocyanato group to afford the corresponding arylsulfenylcarbamates and arylsulfenylureas, respectively.
Regioselective Addition Reaction of Lithium Enolates to Thio-Substituted 1,4-Naphthoquinones. Convenient Synthesis of a Naphthofuran-4,9-dione Ring System
Authors: Kang Wen-Bing , Nan’ya Seiko , Toru Takeshi , Ueno Yoshio
Published: July 2006

The regioselective addition of lithium enolates to thio-substituted 1,4-naphthoquinones gave alkylated 1,4-naphthoquinones via 1,4-addition products. A phenacyl 1,4-naphthoquinone was cyclized to a naphthofuran-4,9-dione ring system.
Surface Enhanced Raman Scattering Spectroscopy of Flavodoxin on Graphite Electrode with Silver Colloids
Authors: Brabec Viktor , Niki Katsumi
Published: July 2006

Surface enhanced Raman scattering of flavin mononucleotide and flavodoxin adsorbed on the pyrolytic graphite electrode were recorded by depositing silver colloids onto the adsorbed layers. The SERS signals were sensitive to the electrode potential and accord very well with those obtained at silver electrode.
Temperature Dependence of Hydrophobic Ion Association of Tris(1,10-phenanthroline)iron(II) Ion with Arenedisulfonate Ions in Water
Authors: Yokoyama Haruhiko , Koyama Yuko , Masuda Yuichi
Published: July 2006

The ion-association constants (K) of [Fe(phen)3]2+ with o- and m-benzenedisulfonate, 2,6- and 2,7-naphthalenedisulfonate ions, determined by conductivity measurements at 0-50 °C, were considerably larger than the electrostatic prediction: K(25°C)=99±3, 204±5, 1021±29, and 792±6 dm3mol−1, respectively. Their hydrophobic behavior was apparently similar to that of alkanesulfonate ions. However, the significant enthalpy contribution was found to the hydrophobic ion association.
Surface Areas and Catalytic Activities of Mn-substituted Hexaaluminates with Various Cation Compositions in the Mirror Plane
Authors: Machida Masato , Kawasaki Hideo , Eguchi Koichi , Arai Hiromichi
Published: July 2006

Surface areas and catalytic activities of Mn-substituted hexaaluminates were investigated as a function of cation composition in the mirror plane. After calcination at 1300 °C, the surface areas of Ba1−xKxMnAl11O19−α and Sr1−xLaxMnAl11O19−α increased with x and attained to be above 23 m2/g at the optimum compositions. The methane combustion activities of these oxides were higher than those of 1 wt% Pt/Al2O3 and LaCoO3.
Baeyer–Villiger Oxidation of β-Ionone with Surfactant Type Peracid
Authors: Fujise Yutaka , Fujiwara Kenshu , Ito Yukiko
Published: July 2006

Treatment of β-ionone with 3-heptadesylmonoperphthalic acid in emulsion system facilitates Baeyer–Villiger oxidation
A Novel One-Step Nickel-Mediated Synthesis of C6Ar6 Conjugated Hydrocarbons, Highly Substituted and Overcrowded Fulvenes and 3,4-Dimethylenecyclobutenes
Authors: Iyoda Masahiko , Mizusuna Akira , Oda Masaji
Published: July 2006

Nickel-catalyzed cyclo-oligomerization of aryl-substituted 1,1-dibromoethylenes in the presence or absence of diarylacety-lenes produces 1,2,3,4,6,6-hexaarylfulvenes and/or 1,2-diaryl-3,4-bis(diarylmethylene)cyclobutenes in moderate yields, providing a new and simple method for C6Ar6 conjugated hydrocarbons, highly overcrowded systems.
Facile Synthesis of γ,δ-Unsaturated β-Azido Carbonyl Compounds via Successive Nucleophilic Additions on Cinnamaldehyde Dimethyl Acetal Catalyzed by Trityl Hexachloroantimonate
Authors: Mukaiyama Teruaki , Leon Patrick , Kobayashi Shu
Published: July 2006

In the presence of a catalytic amount of trityl hexachloroantimonate, cinnamaldehyde dimethyl acetal successively reacts with silyl enol ethers or ketene silyl acetals and azidotrimethylsilane, to afford the corresponding γ,δ-unsaturated β-azido carbonyl compounds in good yields.
Novel Photoinduced Cyclization of 2-Alkoxy-3-(2-oxoalkyl)-1,4-naphthoquinone
Authors: Maruyama Kazuhiro , Osuka Atsuhiro , Nakagawa Katsuhiko , Jinsenji Toshio , Tabuchi Kenzo
Published: July 2006

Irradiation of 2-alkoxy-3-(2-oxoalkyl)-1,4-naphthoquinone in benzene gave a novel cyclization product, (1,3)dioxepino-1,4-naphthoquinone via intramolecular H-abstraction reaction.
Dual Regioselectivity in the Photoallylation of Electron-Deficient Alkenes by Allylic Silanes
Authors: Mizuno Kazuhiko , Ikeda Munehiro , Otsuji Yoshio
Published: July 2006

The photoreaction of 1-aryl-2,2-dicyanoethenes with allylic silanes in the presence of phenanthrene gave 4-aryl-5,5-dicyano-1-pentenes in high yields. In this photoreaction, the allylic groups were introduced regioselectively at the β-position to cyano group. In contrast, the photoreaction of alkylidenepropanedinitriles with allylic silanes gave products allylated at the α-position to cyano group along with their reduction products.
An Efficient Chiral Stationary Phase for High Performance Liquid Chromatographic Separation of Enantiomeric Aliphatic Alcohols
Authors: Ôi Shuichi , Shijo Masayuki , Yamashita Junzo , Miyano Sotaro
Published: July 2006

(S)-1,1′-Binaphthyl-2,2′-dicarboxylic acid was chemically bonded to an aminopropylsilanized silica through amido linkage to give a chiral stationary phase for HPLC, which efficiently differentiated enantiomeric aliphatic alcohols as 3,5-dinitrophenylcarbamates.
Remarkable Effect of the Wavelength in the Photoassisted Carbonylation of the C–H Bond of Decane in the Presence of RhCl(CO)(PR3)2 as the Catalyst
Authors: Sakakura Toshiyasu , Sasaki Koushi , Tokunaga Yuko , Wada Keisuke , Tanaka Masato
Published: July 2006

RhCl(CO)(PR3)2-catalyzed and photoassisted carbonylation of decane leading to the formation of C11 aldehydes and/or 1-nonene was remarkably affected by the wavelength; irradiation with λ > 295 nm was essential to the formation of 1-nonene and undecanal. By cutting off λ > 325 nm, 1-nonene formation was completely suppressed, and a series of isomeric C11 aldehydes were obtained.
Novel Liquid Crystals Having a Large Dielectric Anisotropy
Authors: Takenaka Shunsuke , Morita Hidefumi , Kusabayashi Shigekazu , Masuda Yoshihide , Iwano Makoto , Ikemoto Tetsuya
Published: July 2006

A homologous series of 4-cyanophenyl 4-(2,4-dialkoxybenzoyloxy)benzoates(from the pentyloxy to decyloxy homologs) shows a monotropic nematic phase, and the lower members show a large positive dielectric anisotropy in the mesophase.
Photochemical Formation of Methylamine and Ethylenediamine from Gas Mixtures of Methane, Ammonia, and Water
Authors: Ogura Kotaro , Migita Catharina T , Yamada Tooru
Published: July 2006

The photolysis of mixtures of CH4, NH3, and H2O with a low-pressure mercury lamp led to the formation of considerable amounts of methylamine and ethylenediamine with oxygen-containing compounds, ethane, and hydrogen. CH2NH2 radicals formed during photolysis were detected by ESR applying a spin trap technique, and it was suggested that the coupling of the radicals leads to the formation of ethylenediamine.
Synthesis of Copper(II) Selective Chelating Resin Bearing a Tetraaza Macrocyclic Schiff Base Ligand
Authors: Matsushita Takayuki , Sakiyama Jun , Fujiwara Manabu , Shono Toshiyuki
Published: July 2006

The chelating resin bearing a tetraaza macrocyclic Schiff base ligand as a pendant group has been synthesized and found to have a high selectivity for copper(II) over nickel(II). This resin can be applied to a useful adsorbent for efficient separation of these metal ions in a column system.
Novel Intermolecular Heterocycle Exchange Reaction of Cyclohepta[b][1,4]benzoxazines with o-Aminophenol Derivatives
Authors: Nozoe Tetsuo , Okai Harue , Wakabayashi Hidetsugu , Ishikawa Sumio
Published: July 2006

The benzoxazine moiety of 7-, 8-, and 9-isopropyl-as well as 6-bromocyclohepta[b][1,4]benzoxazines was easily exchanged with o-aminophenol and its methyl derivatives in methanol or acetic acid. A possible pathway of this novel intermolecular heterocycle exchange reaction is discussed.
A Novel Solvent Effect in the Practical Synthesis of Ubiquinone-10
Authors: Eto Hirozumi , Eguchi Chikahiko
Published: July 2006

The mixed solvent of nitromethane and hexane exhibited high stereoselectivity with good yields in the synthesis of ubiquinone-10 by the coupling of 2,3-dimethoxy-5-methylhydroquinone and isodecaprenol in the presence of a catalytic amount of BF3·OEt2.
Incorporation of a Synthetic Model Compound into Bilayer Lipid Membranes and Its Transmembrane Photoconduction
Authors: Sakata Yoshiteru , Tatemitsu Hitoshi , Bienvenue Elisabeth , Seta Patrick
Published: July 2006

The compound P4Q4Q’, where a porphyrin chromophore is covalently linked in series to two different quinones, was incorporated into planar bilayer lipid membranes. Upon irradiation a transmembrane photocurrent due to the intramolecular, multistep electron transfer was observed.