bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
(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

Abstract
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 &gt; 295 nm was essential to the formation of 1-nonene and undecanal. By cutting off λ &gt; 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Synthesis and Properties of 8H-3-Oxaheptalen-8-one
Authors: Nakazawa Tomoo , Ishihara (nee,Ashizawa) Mariko , Jinguji Mamoru , Yamaguchi Masakazu , Yamochi Hideki , Murata Ichiro 
Published: July 2006

Abstract
An ethanol solution of 12-oxatricyclo[7.2.1.02,8]dodeca-2(8),3,6,10-tetraen-5-one was irradiated with a 100-W Hg lamp through pyrex filter to give 8H-3-oxaheptalen-8-one, an oxepine condensed with tropone, in good yield together with a slight amount of 6-hydroxyazulene.
Efficient Synthesis of 2α-Glycoside of N-Acetylneuraminic Acid via Phenylsulfenyl Chloride Adduct of 2-Deoxy-2,3-dehydro-N-acetylneuraminic Acid Methyl Ester Tetra-O-acetate
Authors: Kondo Tadao , Abe Hiroyuki , Goto Toshio 
Published: July 2006

Abstract
Phenylsulfenyl chloride adds to a 2-deoxy-2,3-dehydro-N-acetylneuraminic acid derivative to give predominantly the corresponding 2-chloro-3β-phenylthio derivative, which is an excellent glycosyl donor for the preparation of α-glycosides of sialic acid.
Special Features of Stable Free Radical Formation on Plasma-irradiated α-d-Glucose Studied by ESR Spin-Trapping Technique
Authors: Kuzuya Masayuki , Washino Kaei , Noguchi Akihiro , Ito Akiko 
Published: July 2006

Abstract
The structure of the stable free radicals produced in argon plasma-irradiated α-d-glucose was characterized by the ESR spectral measurements of the spin adducts obtained from the reactions with 2,4,6-tri-t-butylnitrosobenzene (BNB) with the aid of computer simulations.
Convenient Synthesis of Hex-5-enopyranosides
Authors: Sato Ken-ichi , Kubo Noriyuki , Takada Rituko , Aqeel Amjad , Hashimoto Hironobu , Yoshimura Juji 
Published: July 2006

Abstract
Hex-5-enopyranosides were prepared in an one-pot procedure from 6-bromo-6-deoxy- or 6-O-tosylhexopyranoside by the successive treatment with iodide anion and 1,8-diazabicyclo-[5.4.0]undec-7-ene in DMSO.
Alkyl Transfer in the Heterodinuclear Organometallic Complex. Preparation of Organo(1,5-cyclooctadiene)platinum-tricarbonyl(cyclopentadienyl)tungsten
Authors: Komiya Sanshiro , Endo Isao 
Published: July 2006

Abstract
Methyl(1,5-cyclooctadiene)platinum-tricarbonyl(cyclopentadienyl) tungsten has been prepared by the reaction of methylchloro(1,5-cyclooctadiene)platinum(II) with sodium tricarbonyl-(cyclopentadienyl)tungstate(0). Methyl transfer from platinum to tungsten smoothly takes place on thermolysis as well as by the reaction with tertiary phosphine ligands, CO, or olefins.
Enzyme-catalyzed Asymmetric Hydrolysis of meso-Substrate. The Facile Synthesis of Both Enantiomers of cis-2,5-Disubstituted Tetrahydrofuran Derivatives
Authors: Naemura Koichiro , Takahashi Nobuo , Chikamatsu Hiroaki 
Published: July 2006

Abstract
The enzyme-catalyzed asymmetric hydrolysis of the meso-diesters derived from cis-2,5-bis(hydroxymethyl)tetrahydrofuran in presence of PLE, PPL, and CCL afforded the optically active half-esters. The both enantiomers of cis-5-(hydroxymethyl)tetrahydrofuran-2-carboxylic acid with high optical purity were prepared from the half-esters.
One-Pot Synthesis of α-Mono- and α,α-Disubstituted Cyclic Ethers from Lactones
Authors: Mukaiyama Teruaki , Homma Koichi , Takenoshita Haruhiro 
Published: July 2006

Abstract
α-Mono- and α,α,-disubstituted cyclic ethers are prepared in good yields by the successive treatment of lactones with t-butyldimethylsiloxy-1-ethoxyethene and silyl nucleophiles (triethylsilane, allyltrimethylsilane, trimethylsilyl cyanide, etc.) in the presence of a catalytic amount of trityl salts such as TrSbCl6, TrSbF6 and TrClO4 or antimony pentachloride combined with chlorotrimethylsilane and tin(II) halide.
Spectral Evidences for the J-Aggregate Formation of a Non-Benzenoid Aromatic Dye, Dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-dione
Authors: Takeshita Hitoshi , Mori Akira , Nagao Tomohiro , Nagamura Toshihiko 
Published: July 2006

Abstract
The planar and symmetrically conjugated π-system, dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-dione, showed a narrow and intense absorption band and resonance fluorescence in cone H2SO4 solutions as low as 10−7 M. These observations show the formation of the J-aggregate. A remarkable solvatochromism was also noticed in organic solvents (476 nm in CHCl3 and 547 nm in DMF).
Application of Host–Guest Complexation Method to Isolation of Natural Product
Authors: Segawa Mari , Mori Koji , Toda Fumio 
Published: July 2006

Abstract
Application of host–guest complexation method to isolation of caffeine, nicotine, and cholesterol from tea and tabaco leaves, and gallstone, respectively, has been reported. Separations of strychnine and brucine, and sparteine and brucine by the same method were also reported.