bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNTHESIS OF MACROCYCLIC SCHIFF BASE POLYMER LIGAND AS A HIGHLY SELECTIVE EXTRACTANT FOR COPPER(II)
Authors: Matsushita Takayuki , Kubota Noboru , Fujiwara Manabu , Shono Toshiyuki
Published: July 2006

A novel polymer ligand (Poly-L) in which 6,8,15,17-tetramethyl-dibenzo-5,9,14,18-tetraazacyclotetradecene (L) is present as an integral part of the polymer backbone was synthesized and its solvent extraction of copper(II) and nickel(II) was investigated in comparison with L. The complexation reactions of Poly-L with the above metal ions were found to be much faster than those of L, with a high selectivity for copper(II).
KINETIC CHARACTERIZATION OF AN ANION RADICAL-SUBSTRATE DIMERIZATION MECHANISM
Authors: Maragaretha Paul , Parker Vernon D
Published: July 2006

The anion radical of isobutylidene Meldrum’s acid undergoes dimerization by coupling with substrate to give an intermediate which is converted to dimer by electron transfer reduction from the anion radical.
EIGHT MINOR PHYTOALEXINS FROM DISEASED PAPER MULBERRY
Authors: Takasugi Mitsuo , Niino Nobuyuki , Nagao Shigemitsu , Anetai Masaki , Masamune Tadashi , Shirata Akira , Takahashi Kokichi
Published: July 2006

The fungus-inoculated Broussonetia papyrifera shoot cortical tissues produced eight minor antifungal compounds: two flavans named broussinol and demethylbroussin, four 1,3-diphenylpropanes named broussonin C–F, and two chalcones. Isolation and structure elucidation of these compounds are described.
ISOMERIZATION OF ALKANES OVER A PALLADIUM SALT OF HETEROPOLYACID
Authors: Suzuki Shigeo , Kogai Katsuhiko , Ono Yoshio
Published: July 2006

Palladium dodecatungstophosphate (Pd3(PW12O40)2) supported on silica is an active and selective catalyst for the isomerization of pentane and hexane in the presence of hydrogen. Thus, hexane could be isomerized in a flow system under atmospheric pressure over 90% selectivity at 483 K. The reaction proceeds in a dual-dunctional mechanism; palladium metal formed by the reduction of palladium(II), and protons, act as a hydrogenation-dehydrogenation catalyst and an olefin-isomerization catalyst, respectively.
TWO SIX-MEMBERED RINGS ANNELATION TO CYCLIC KETONES THROUGH TWO SEQUENTIAL DIELS–ALDER REACTIONS
Authors: Tsuge Otohiko , Wada Eiji , Kanemasa Shuji , Sakoh Hirohiko
Published: July 2006

A method for the two six-membered rings annelation to cyclic ketones through two sequential Diels–Alder reactions is presented. Naphtho-annelated cycloalkanes with a variety of unsaturation are accessible by choosing the kind of dienophiles, the order of their use, and dehydrogenation.
SODIUM BROMITE: A NEW REAGENT FOR THE HOFMANN DEGRADATION OF AMIDES
Authors: Kajigaeshi Shoji , Nakagawa Takashi , Fujisaki Shizuo , Nishida Akiko , Noguchi Michihiko
Published: July 2006

Amines are prepared in fairly good yields by the reaction of amides with sodium bromite in the presence of catalytic amount of sodium bromide in aqueous sodium hydroxide. The scope and limitations are also presented.
QUASI-FREE ELECTRON PRODUCED IN RADIOLYSIS OF ZEOLITE
Authors: Nakazato Chiyoko , Masuda Takahiro
Published: July 2006

Relative reaction rates were determined for the reaction of electron produced in radiolysis of zeolite with several electron scavengers by a competition method using N2O as a reference compound. A trend in the relative reactivities was very close to that reported for liquid 2,2-dimethylpropane.
USEFUL CHIRAL PACKING MATERIALS FOR HIGH-PERFORMANCE LIQUID CHROMATOGRAPHIC RESOLUTION. CELLULOSE TRIACETATE AND TRIBENZOATE COATED ON MACROPOROUS SILICA GEL
Authors: Okamoto Yoshio , Kawashima Mitsunobu , Yamamoto Koji , Hatada Koichi
Published: July 2006

Cellulose triacetate and tribenzoate coated on macroporous silica gel showed excellent capabilities of chiral recognition as packing materials for high-performance liquid chromatographic resolution of various enantiomers. Chiral recognition by the cellulose triacetate was different from that by the microcrystalline cellulose triacetate.
VERSATILE RELATIVE AND ABSOLUTE STEREOCONTROL IN STANNOUS TRIFLATE MEDIATED ALDOL-TYPE REACTIONS OF 3-(2-BENZYLOXYACETYL)THIAZOLIDINE-2-THIONE
Authors: Mukaiyama Teruaki , Iwasawa Nobuharu
Published: July 2006

In the stannous triflate mediated aldol-type reactions of 3-(2-benzyloxyacetyl)thiazolidine-2-thione, stereochemical course of the reactions is dramatically altered by the addition of tetramethylethylenediamine as a ligand. High asymmetric induction is also achieved by the addition of chiral diamine derived from l-prolin.
A NOVEL SYNTHESIS OF AROMATIC NITRILE BY THE REACTION OF AROMATIC ALDEHYDE WITH TRIMETHYLSILYL AZIDE
Authors: Nishiyama Kozaburo , Watanabe Akio
Published: July 2006

In the presence of zinc chloride, the reaction of aromatic aldehydes with trimethylsilyl azide (TMSA) gave readily the corresponding nitriles in good yields under mild conditions.
WATER-INDUCED FORMATION OF AZOMETHINE YLIDE 1,3-DIPOLE. STEREOSPECIFIC AND REGIOSELECTIVE CYCLOADDITION REACTIONS
Authors: Tsuge Otohiko , Kanemasa Shuji , Hatada Akira , Matsuda Koyo
Published: July 2006

An N-(trimethylsilylmethyl)imine generates the azomethine ylide 1,3-dipole of nonstabilized type, when treated with water, which cycloadds to olefinic dipolarophiles in a stereospecific and regioselective manner.
AN ASYMMETRIC TRANSFORMATION OF CYCLOHEXENE OXIDE TO (S)-2-CYCLOHEXEN-1-OL BY CHIRAL LITHIUM AMIDES
Authors: Asami Masatoshi
Published: July 2006

(S)-2-Cyclohexen-1-ol is prepared in 92% ee from cyclohexene oxide by using chiral lithium amides, prepared from butyllithium and (S)-2-(disubstituted aminomethyl)pyrrolidines, as bases.
EFFECT OF THE Ru+++ TREATMENT ON THE ELECTROCHEMICAL HYDROGEN EVOLUTION REACTION AT GaAs ELECTRODES
Authors: Uosaki Kohei , Kita Hideaki
Published: July 2006

The electrochemical hydrogen evolution reaction (H.E.R.) both at n-GaAs and p-GaAs electrodes in dark was accelerated significantly by the dip treatment in RuCl3 solution but the photocurrents at p-GaAs decreased by the treatment. These results and impedance analyses show that the Ru+++ treatment introduces not only catalytic surface for H.E.R. but also surface states which act as recombination centers.
A SHORT SYNTHESIS OF cis-2-FORMYL-5-HYDROXY-2-CYCLOPENTENE-1-ACETIC ACID γ-LACTONE. THE KEY INTERMEDIATE OF PROSTAGLANDIN SYNTHESIS
Authors: Sato Masayuki , Sekiguchi Keiko , Kaneko Chikara
Published: July 2006

A practically one-pot synthesis of the title compound from 2,2-dimethyl-1,3-dioxin-4-one and cis-2-cyclopentene-1,4-diol by an application of de Mayo method is described.
ASYMMETRIC REDUCTION OF BENZIL TO BENZOIN CATALYZED BY THE ENZYME SYSTEM OF A MICROORGANISM
Authors: Konishi Jin , Ohta Hiromichi , Tsuchihashi Gen-ichi
Published: July 2006

Benzil was reduced by incubation with a bacterium in a nutrient medium to afford (R)-benzoin. Substituted benzils were also hydrogenated to the corresponding benzoins in a similar manner.
DIRECT LIQUEFACTION OF WOOD BY ALKALI AND ALKALINE EARTH SALT IN AN AQUEOUS PHASE
Authors: Ogi Tomoko , Yokoyama Shin-ya , Koguchi Katsuya
Published: July 2006

Catalytic effects of various salts of alkali and alkaline earth metals were tested in the direct liquefaction of wood in an aqueous phase without a reducing agent like H2 or CO. A marked effect of sodium, potassium and calcium salts was observed for the production of heavy oils in more than 50% yields.
STRUCTURE OF A NEW BROMODITERPENE, PREPINNATERPENE, FROM THE MARINE RED ALGA LAURENCIA PINNATA YAMADA
Authors: Fukuzawa Akio , Takaya Yoshiaki , Matsue Hideki , Masamune Tadashi
Published: July 2006

The structure of a new bromoditerpene named prepinnaterpene, isolated from the title alga, is described.
SYNTHESIS OF DESTOMYCIN C, A PSEUDO-TRISACCHARIDE ANTIBIOTIC HAVING AN INTERGLYCOSIDIC SPIRO-ORTHOESTER LINKAGE
Authors: Yoshimura Juji , Horito Shigeomi , Tamura Jun-ichi , Hashimoto Hironobu
Published: July 2006

Destomycin C, a pseudo-trisaccharide antibiotic of orthosomycin family was synthesized via spiro-orthoester formation between 5-o-(β-d-mannopyranosyl)-2-deoxystreptamine and 6-amino-6-deoxyheptonolactone derivatives.
SOLID-SOLID TRANSITION IN HEXAMETHYLBENZENE THAT DEPENDS ON THERMAL HISTORY
Authors: Yoshimoto Yoshikazu , Fujiwara Takahiro , Atake Tooru , Chihara Hideaki
Published: July 2006

New results about the II-III phase transition in hexamethylbenzene have been obtained, which show large hysteresis. From the adiabatic calorimetry in the cooling direction, combined with those in the heating direction, the true transition point was determined to be 115.5±0.3 K with the entropy of transition, 9.55±0.08 J·K−1·mol−1. Under certain conditions, the anomalous heat capacity curve can be made to consist of two separate peaks. It is a manifestation of “memory effect” of the first-order transition.
A CONVENIENT SYNTHETIC METHOD FOR SCHIFF BASES. THE TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE-CATALYZED REACTION OF N,N-BIS(TRIMETHYLSILYL)AMINES WITH ALDEHYDES AND KETONES
Authors: Morimoto Toshiaki , Sekiya Minoru
Published: July 2006

N,N-Bis (trimethylsilyl)amines react with aldehydes or ketones in the presence of trimethylsilyl trifluoromethanesulfonate to give Schiff bases in high yields. In situ utilization of the reaction solution as the Schiff base is also demonstrated.
CARBOMETALLATION OF 1,4-BIS(TRIMETHYLSILYL)-1,3-BUTADIYNE WITH TRIMETHYLALUMINIUM
Authors: Kusumoto Tetsuo , Nishide Kiyoharu , Hiyama Tamejiro
Published: July 2006

Carbometallation of 1,4-bis(trimethylsilyl)-1,3-butadiyne with Me3Al in the presence of Cp2ZrCl2 catalyst produced selectively an alkenylaluminium intermediate which, upon treatment with water and various electrophiles, afforded 2-methyl-1,4-bis(trimethylsilyl)-1-buten-3-yne and its 1-substituted derivatives.
A BENT CYCLOPOLYSILANE ANION-RADICAL (i-Pr2Si)4
Authors: Wadsworth Cynthia L , West Robert , Nagai Yoichiro , Watanabe Hamao , Matsumoto Hideyuki , Muraoka Tsutomu
Published: July 2006

The ESR spectra for (i-Pr2Si)4\ewdot and (s-Bu2Si)4\ewdot show two equally-intense splitting constants for α-13C, indicating that these anion-radicals are bent and not rapidly interconverting.
SIMULTANEOUSLY OCCURRING HYDROXYLATION, HYDRATION, AND HYDROGENATION OF THE C=C BOND OF ALIPHATIC CARBOXYLIC ACIDS IN AQUEOUS SOLUTION BY GLOW DISCHARGE ELECTROLYSIS
Authors: Kokufuta Etsuo , Shibasaki Takami , Sodeyama Touru , Harada Kaoru
Published: July 2006

Glow discharge electrolyses of maleic and acrylic acids in carbonate-free distilled water simultaneously afford the products into which OH and/or H groups are introduced, indicating the addition reactions of OH and H radicals to the C=C bond.
PHOTOCHROMISM. SYNTHESIS AND PROPERTIES OF INDOLINOSPIROBENZOTHIOPYRANS
Authors: Arakawa Sei’ichi , Kondo Hirofumi , Seto Jun’etsu
Published: July 2006

Novel photochromic compounds, indolinospirobenzothiopyrans, were prepared and their properties in polymer films were examined. The absorption bands of the colored form lie around 100 nm deeper in the long-wave region of the spectrum than are the case with the common spiropyrans.
NICKEL THIOLATES. SIMPLE SYNTHESIS, THE BEHAVIOR UPON PROTOLYSIS AND OXIDATION POTENTIALS
Authors: Yamamura Takeshi , Miyamae Hiroshi , Katayama Yasuyuki , Sasaki Yukiyoshi
Published: July 2006

(NEt4)2[Ni(SPh)4], (NEt4)3[Ni3(SEt)12] and (NEt4)2[Ni2(edt)3] (edt=ethan-1,2-dithiolate dianion), were synthesized by a simple method. These complexes were condensated stepwise by controlled protolysis through their own higher clusters such as [Ni(SEt)2]n(n≠∞) and (NEt4)2[Ni3(edt)4] to the polymers, [Ni(SPh)2]∞,[Ni(SEt)2]∞, and [Ni(edt)]∞.
PALLADIUM-CATALYZED COUPLING OF ALLYLIC ACETATES WITH ZINC
Authors: Sasaoka Shin-ichi , Yamamoto Taku , Kinoshita Hideki , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

Allylic acetates were coupled with zinc dust in the presence of a catalytic amount of [Pd(PPh3)4] to give the corresponding 1,5-dienes under mild conditions in high yields. Significant co-solvent effects were found with methanol or 1,2-ethanediol in tetrahydrofuran.
A CONVENIENT SYNTHESIS OF SYMMETRICAL DIARYL TELLURIDES USING TELLURIUM/RONGALITE AS TELLURATION SYSTEM
Authors: Suzuki Hitomi , Inouye Masahiko
Published: July 2006

Sodium telluride, prepared by reducing tellurium with rongalite in dilute aqueous sodium hydroxide, readily reacts with nonactivated aryl iodides to afford symmetrical diaryl tellurides in good yields.
A NEW DITERPENOID FROM LEUCOTHOE GRAYANA MAX.
Authors: Katai Masaaki , Terai Tadamasa , Meguri Haruo
Published: July 2006

A new minor diterpenoid was isolated from the leaves of Leucothoe grayana Max., and its structure was characterized as a secograyanane derivative(1, 3(S), 6(R), 14(R), 16(R)-tetrahydroxy-5-oxo-5,10-seco-ent-kaur-1(10)-ene) by spectroscopic and chemical studies.
EFFECT OF Nb2O5 ADDITION ON THE CATALYTIC ACTIVITY OF FeOx FOR REDUCTION OF NOx WITH NH3 AND O2
Authors: Okazaki Susumu , Kuroha Hiroshi , Okuyama Tetsuhiro
Published: July 2006

Niobium oxide, Nb2O5, remarkably enhanced the catalytic activity of FeOx for the reduction of NOx with NH3 and O2. Thus, for the reduction catalyzed by FeOx containing a small amount of Nb2O5, the conversion attained 90–100% in contrast to less than 40% for the reduction catalyzed by FeO without Nb2O5. The catalytic activity of the mixed oxide was scarcely affected by addition of SO2 to the reaction gas.
VAPOR PHASE CARBONYLATION OF METHYL ACETATE, METHANOL, AND DIMETHYL ETHER WITH MOLYBDENUM-ACTIVE CARBON CATALYST
Authors: Shikada Tsutomu , Yagita Hiroshi , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

A molybdenum-active carbon catalyst was found to catalyze the vapor phase carbonylation of methyl acetate and related compounds under pressurized conditions in the presence of methyl iodide promoter. Acetic anhydride was formed from methyl acetate with an yield of 15% and a selectivity of 83% at 250 °C and 45 atm. The molybdenum-active carbon catalyst was active also for the carbonylation of methanol and dimethyl ether to form methyl acetate.
A STEREOSELECTIVE SYNTHESIS OF METHYL d-GLUCOSAMINATE VIA TIN(II) ENEDIOLATE FORMED FROM FURYLGLYOXAL
Authors: Mukaiyama Teruaki , Tsuzuki Ryuji , Kato Jun-ichi
Published: July 2006

The tin(II) enediolate, formed in situ from furylglyoxal, reacts with polyoxyaldehydes such as 2,3-O-isopropylidene-d-glyceraldehyde and 4-O-benzyl-2,3-O-isopropylidene-l-threose to give the cross aldol adducts in good yields. This reaction is successfully applied to the synthesis of methyl d-glucosaminate.
EFFICIENCY OF TWO-STAGE HYDRODENITROGENATION OF AROMATIC NITROGEN COMPOUNDS
Authors: Mochida Isao , Sakanishi Kinya , Korai Yozo , Fujitsu Hiroshi
Published: July 2006

A high hydrodenitrogenation (86%) of acridine on a Ni–Mo/Al2O3 catalyst was achieved By successive reactions at 370 °C for 2 h and 420 °C for 3 h, respectively, while the single stage reaction at 420 °C for 5 h removed only 67% nitrogen. The effective hydrodenitrogenation is postulated due to the extensive hydrogenation in the first stage and C–N bond fission in the second stage.
THE STEREOSELECTIVE MICHAEL REACTION BETWEEN SILYL ENOL ETHERS AND α,β-UNSATURATED KETONES BY THE USE OF TRITYL PERCHLORATE AS A CATALYST
Authors: Mukaiyama Teruaki , Tamura Masanori , Kobayashi Shu
Published: July 2006

The Michael adducts are obtained with good to excellent ul selectivity by treating silyl enol ethers with α,β-unsaturated ketones in the presence of a catalytic amount of trityl perchlorate.
THE STRUCTURES OF SESQUITERPENE GLYCOSIDES FROM Pittosporum tobira Ait
Authors: Takaoka Daisuke , Kawahara Hiroshi , Ochi Shima , Hiroi Mitsuru , Nozaki Hiroshi , Nakayama Mitsuru , Ishizaki Kazuhiko , Sakata Kanzo , Ina Kazuo
Published: July 2006

The structures of two new sesquiterpene glycosides, pittosporanoside A1, and A2, isolated from the title plant were determined on the basis of chemical and spectral evidence and X-ray crystal structure analysis.
AGGREGATION STRUCTURE OF PORPHYRIN MODEL COMPLEX 4,4′-DIHEXYL-N,N′-DISALICYLIDENE-ETHYLENEDIAMINENICKEL (II) IN CHLOROFORM-d1 SOLUTION STUDIED BY 1H NMR SPECTRA
Authors: Miyamura Kazuo , Gohshi Yohichi
Published: July 2006

1H NMR peak shift due to aggregation was observed in chloroform-d1 solution of porphyrin model complex, 4,4′ -dihexyl-N,N′-disalicylidene-ethylenediaminenickel(II) (1), and a piled structure was proposed for the aggregate of 1 from the sign and the amount of the shifts.
A Simple Synthesis of Adenosine 3′,5′-Cyclic Phosphate Alkyl Triesters
Authors: Kataoka Shigehiro , Isono Junko , Yamaji Nobuyuki , Kato Motohiko
Published: July 2006

A series of alkyl triesters of c-AMP has been prepared from c-AMP tri-n-butylammonium salt by treating with readily available alkyl halides in the presence of tri-n-butylamine in N,N-dimethylacetamide. By this method the axial isomers were obtained predominantly.
SYNTHESIS OF CHIRAL 2-METHYL-3-ALKENOIC ESTERS VIA 1,2-REARRANGEMENT OF ALKENYL GROUP
Authors: Honda Yutaka , Ori Aiichiro , Tsuchihashi Gen-ichi
Published: July 2006

Hydrolysis of optically pure 1-alkenyl-2-sulfonyloxy-1-propanone acetals afforded optically and geometrically pure title compounds via stereospecific 1,2-rearrangement of alkenyl group.
Asymmetric Oxidation of Sulfides to Sulfoxides by Organic Hydroperoxides with Optically Active Schiff Base-Oxovanadium(IV) Catalysts
Authors: Nakajima Kiyohiko , Kojima Masaaki , Fujita Junnosuke
Published: July 2006

The asymmetric oxidation of sulfides into the corresponding sulfoxides was achieved with organic hydroperoxides in the presence of a catalytic amount of optically active Schiff base-oxovanadium(IV) complexes; in most cases the optical yields (e.e.) ranged between 20 and 40%.
A Novel Route to Phenyl-substituted Pyridines by the Reaction of N-(1-Phenylvinyl)iminophosphoranes with α,β-Unsaturated Ketones
Authors: Kobayashi Tomoshige , Nitta Makoto
Published: July 2006

The N-(1-phenylvinyl)iminotriphenylphosphorane or N-(1-phenylvinyl)iminotributylphosphorane reacted with α,β-unsaturated ketones to undergo a novel C–C bond formation followed by aza-Wittig reaction to result in the formation of phenyl-substituted pyridines.
Antioxidant Activity of Vitamin E in Liposomal Membranes
Authors: Niki Etsuo , Takahashi Mareyuki , Komuro Erika
Published: July 2006

Antioxidant activity of vitamin E in liposomal membranes was compared with that in homogeneous solution. It was found that vitamin E could move in the liposomal membranes rapidly but that the antioxidant efficiency in the membranes was considerably lower than that in homogeneous solution.
Reduction of Ketene Dithioacetal S,S-Dioxides with Sodium Borohydride and Its Application to a Convenient Synthesis of Alkyl Arylmethyl Ketones
Authors: Ogura Katsuyuki , Ohtsuki Kazuo , Takahashi Kazumasa , Iida Hirotada
Published: July 2006

The C–C double bond of a ketene dithioacetal S,S-dioxide was found to undergo reduction with sodium borohydride. This fact provides an efficient synthetic route from an aromatic aldehyde to an alkyl arylmethyl ketone using methylthiomethyl p-tolyl sulfone.
Regioselective Alkylation of 1,3-Dioxolan-2-ylium Cation Derived from α,β-Unsaturated Aldehyde Ethylene Acetal with Lithium Organo Compounds
Authors: Mukaiyama Teruaki , Hayashi Yujiro , Hashimoto Yukihiko
Published: July 2006

1,3-Dioxolan-2-ylium cations derived from α,β-unsaturated aldehyde ethylene acetals regioselectively react with lithium organocuprate and lithium organoaluminate to give the corresponding esters and ketals, respectively.
The Double Michael Reaction of α,β-Unsaturated Ketones with Siloxydienes Catalyzed by Trityl Perchlorate Forming Six-Membered Ring Systems
Authors: Mukaiyama Teruaki , Sagawa Yukihiro , Kobayashi Shu
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, the double Michael reaction of α,β-unsaturated ketones with siloxydienes smoothly proceeds to afford six-membered ring systems stereoselectively in good yields. Decalin derivatives are also obtained according to this procedure.
New Efficient Palladium-Catalyzed Perfluoroalkylation of Carbon-Carbon Multiple Bonds with F-Alkyl Iodides. An Expedient Route to F-Alkylated Alkyl and Alkenyl Iodides
Authors: Ishihara Takashi , Kuroboshi Manabu , Okada Yoshiji
Published: July 2006

A variety of alkenes and alkynes efficiently undergo the perfluoroalkylation with F-alkyl iodides in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) in hexane to give good yields of the corresponding F-alkylated alkyl and alkenyl iodides, respectively.
Total Synthesis of Cycloaraneosene, a Fundamental Hydrocarbon of “epi”-Fusicoccane Diterpenoids, and the Structure Revision of Its Congener, Hydroxycycloaraneosene
Authors: Kato Nobuo , Tanaka Shinya , Takeshita Hitoshi
Published: July 2006

The 5-8-5-membered tricyclic diterpene, cycloaraneosene, has been totally synthesized via the stereoselective condensation of two units of optically active iridoids, Cope rearrangement and chemical reduction of the tetrasubstituted C=C bond. The NMR spectrum of synthetic 9α-hydroxycycloaraneosene was not identical with the congener product, and the natural alcohol is likely to be 8β-hydroxyl derivative.
Anion Arrangement in a New Molecular Superconductor, θ-(BEDT-TTF)2(I3)1−x(AuI2)x,(x<0.02)
Authors: Kobayashi Akiko , Kato Reizo , Kobayashi Hayao , Moriyama Shinji , Nishio Yutaka , Kajita Koji , Sasaki Wataru
Published: July 2006

Three-dimensional arrangement of the anions in the recently found molecular superconductor θ-(BEDT-TTF)2(I3)1−x(AuI2)x,(x<0.02) was determined by the use of weak reflections which were omitted in the previous analysis of the “average structure”.
Electron-Impact-Induced Phosphorescence of Benzophenone at Low Vapor Pressures
Authors: Inoue Akinori
Published: July 2006

Phosphorescences of benzophenone were measured at pressures between 0.4 and 2.2 Pa under electron impact. Emissions from vibrationally excited T1 molecules were observed at lower pressures. Excitation mechanism by electron impact was discussed on the basis of excitation energy dependence.
Preparation and in Situ Reflection Spectra of Bilayer Electrodes with Polythiophene Outer Layers
Authors: Murao Kenji , Suzuki Kazuhiro
Published: July 2006

Bilayer electrodes derived from 3-methylthiophene and bithiophene, Pt/poly[tris(4-vinyl-4′-methyl-2,2′-bipyridine)ruthenium(II) perchlorate]/polythiophene, have been prepared. Their in situ reflection spectra upon electrochemical potential sweeps suggest the transient occurrence of polarons in the doped polythiophenes.
Synthesis of (−)-8a-epi-Swainsonine, (1S,2R, 8R, 8aS) -Octahydro-1,2,8-indolizinetriol
Authors: Tadano Kin-ichi , Hotta Yukinori , Morita Masahiro , Suami Tetsuo , Winchester Bryan , Bello Isabelle Cenci di
Published: July 2006

The title compound, one of the stereoisomers of physiologically interesting indolizidine alkaloid swainsonine, has been synthesized from the known methyl 3-azido-4,6-O-benzylidene-3-deoxy-α-d-altropyranoside.
ENZYME MEDIATED SYNTHESIS OF OPTICALLY ACTIVE ω-ARENESULFINYLALKANOIC ESTERS
Authors: Ohta Hiromichi , Kato Yasuo , Tsuchihashi Gen-ichi
Published: July 2006

Incubation of methyl arenesulfinylacetates and methyl α-benzenesulphinylpropionate with Corynebacterium equi IFO 3730 afforded the corresponding chiral sulfoxides of high optical purities in moderate to good chemical yields.
SYNTHESIS AND UNAMBIGUOUS ASSIGNMENT OF STRUCTURE TO PYRANO[4,3-c]PYRAZOL-4(1H)-ONES AND -4(2H)-ONES
Authors: Cantos Albert , March Pere De , Moreno-Mañas Marcial , Pla Anna , Sanchez-Ferrando Francisco , Virgili Albert
Published: July 2006

A clean synthesis of pyranopyrazolones is described. The reactions of 4-chloro-3-(1-chlorovinyl)-6-methyl-2-pyrone with arylhydrazines give pyrano[4,3-c]pyrazol-4(2H)-ones as the only identified products. However, the isomeric pyrano [4,3-c]pyrazol-4(1H)-ones have been isolated when alkylhydrazines were used. Unambiguous assignment of structure could be achieved by homonuclear 1H{1H} NOE determinations.
SYNTHESIS OF 2-[[3-HYDROXY-5-[3-(4-HYDROXYPHENYL)-1-OXO-2-PROPENYL]-3-METHYL-2,4,6-TRIOXOCYCLOHEX-1-YL]METHYLENE]-4-HYDROXY-6-[3-(4-HYDROXYPHENYL)-1-OXO-2-PROPENYL]-4-METHYL-1,3,5-TRIOXOCYCLOHEXANE, AN ANALOG OF CARTHAMIN
Authors: Obara Heitaro , Namai Sozo , Machida Yoshihisa
Published: July 2006

The synthesis of 2-[[3-hydroxy-5-[3-(4-hydroxyphenyl)-1-oxo-2-propenyl]-3-methyl-2,4,6-trioxocyclohex-1-yl]methylene]-4-hydroxy-6-[3-(4-hydroxyphenyl)-1-oxo-2-propenyl]-4-methyl-1,3,5-trioxocyclohexane, an analog of carthamin, was investigated.
INVESTIGATION ON A LEAN-BURN OXYGEN SENSOR USING PEROVSKITE-TYPE OXIDES
Authors: Yu Chunying , Shimizu Yasuhiro , Arai Hiromichi
Published: July 2006

The oxygen sensitivity of SrTiO3 doped with MgO has been investigated in the exhaust gas of propane-oxygen combustion as a function of the MgO content. Among the specimens studied, SrTi0.6Mg0.4O3−δ. appeared to be a suitable material for a lean-burn oxygen sensor, because it exhibited a high oxygen sensing performance in the lean-burn region and an excellent stability in the rich-burn region.
MOLECULAR ORBITAL (MO) THEORY FOR MAGNETICALLY INTERACTING ORGANIC COMPOUNDS. AB-INITIO MO CALCULATIONS OF THE EFFECTIVE EXCHANGE INTEGRALS FOR CYCLOPHANE-TYPE CARBENE DIMERS
Authors: Yamaguchi Kizashi , Fukui Hiroaki , Fueno Takayuki
Published: July 2006

A generalized molecular orbital (GMO) theory for magnetically interacting organic compounds has been presented. The theory is applied to the calculations of the effective exchange integrals (Jab) for the cyclophane-type carbene dimers whose para and ortho-isomers have the high-spin ground state. The calculated Jab-values are consistent with observations.
STRUCTURES OF NAEMATOLIN AND NAEMATOLIN B, 1S,9S-RING-FUSED CARYOPHYLLANE SESQUITERPENOIDS
Authors: Doi Kozo , Shibata Takao , Nara Masataka , Tsuboyama Sei , Sakurai Tosio , Tsuboyama Kaoru
Published: July 2006

It is well known that naturally occurring caryophyllane sesquiterpenoids possess in general 1R,9S(trans)-ring juncture. However, it has been clarified that both of naematolin and naematolin B, microbial products, have 1S,9S(cis)-ring juncture in the caryophyllane skeleton.
A NEW MOLECULAR SUPERCONDUCTOR, (BEDT-TTF)2(I3)1−x(AuI2)x(x<0.02)
Authors: Kobayashi Hayao , Kato Reizo , Kobayashi Akiko , Nishio Yutaka , Kajita Koji , Sasaki Wataru
Published: July 2006

A new molecular superconductor based on BEDT-TTF molecule was prepared electrochemically by using the mixed supporting electrolyte, (n-C4H9)4NI3 and (n-C4H8)4NAuI2. The superconducting transition takes place at ambient pressure at 3.6 K. X-Ray diffraction patterns show that the system can be approximately assigned to a pseudo orthorhombic one with the lattice constants of a=10.076(2), b=33.853(5), c=4.964(1) Å.
PALLADIUM-PROMOTED AROMATIC ANNELATION WITH ACETYLENE DICARBOXYLATES
Authors: Sakakibara Tsutomu , Tanaka Yasuo , Yamasaki Shin-ichi
Published: July 2006

Benzene rings of N-alkyltoluidine and benzene (or iodobenzene) in acetic acid were annelated with acetylenedicarboxylates by palladium(II) acetate to give N-alkylindole-2,3-dicarboxylate and naphthalene-1,2,3,4-tetracarboxylate. The formation of the products are explained in terms of toluidine radical cation intermediates.
PREPARATION OF MONO- AND MULTILAYER FILMS OF AROMATIC POLYIMIDES USING LANGMUIR–BLODGETT TECHNIQUE
Authors: Kakimoto Masa-aki , Suzuki Masa-aki , Konishi Toru , Imai Yoshio , Iwamoto Mitsumasa , Hino Taro
Published: July 2006

Monolayer film of polyamic acid alkylamine salt at air–water interface was successfully deposited onto appropriate plates. Subsequent treatment of the multilayer film with a mixture of acetic anhydride and pyridine afforded the multilayer film of polyimide. The distance between two layers of the polyimide multilayer film was estimated to be 4 Å.
HETERO HEAD-TO-HEAD DIMER BY TOPOCHEMICAL PHOTOREACTION OF METHYL α-CYANO-4-[2-(2-PYRIDYL)ETHENYL]CINNAMATE
Authors: Kato Satoshi , Nakatani Mitsunobu , Harashina Hatsuhiko , Saigo Kazuhiko , Hasegawa Masaki , Sato Sadao
Published: July 2006

Methyl α-cyano-4-[2-(2-pyridyl)ethenyl]cinnamate crytstal shows a high photoreactivity to form the dimer of single structure quantitatively. This result is a unique example in such point that the topochemical photoreaction of β-form diolefin crystals gives neither of the polymer nor the cyclic dimer, but the photostable diolefinic dimer.
DESULFONYLATION OF β-KETO SULFONES WITH THE HANTZSCH ESTER, AN NAD(P)H MODEL
Authors: Nakamura Kaoru , Fujii Masayuki , Mekata Hideyuki , Oka Shinzaburo , Ohno Atsuyoshi
Published: July 2006

Carbon–sulfur bonds in β-keto sulfones were reduced smoothly to carbon–hydrogen bonds with the Hantzsch ester, a model of NAD(P)H.
CYCLOADDITION OF STABLE DISILENES TO TERMINAL ACETYLENES
Authors: Young Douglas J De , West Robert
Published: July 2006

Tetramesityldisilene and trans-1,2-di-t-butyl-1,2-dimesityldisilene (3) react with various 1-alkynes to give air-stable disilacyclobutenes. The cycloaddition of 3 to alkynes produces equal amounts of both stereoisomers, consistent with a stepwise mechanism.
Photocatalytic Activities of Layered Titanium Compounds and Their Derivatives for H2 Evolution from Aqueous Methanol Solution
Authors: Shibata Mutsumi , Kudo Akihiko , Tanaka Akira , Domen Kazunari , Maruya Ken-ichi , Onishi Takaharu
Published: July 2006

The photocatalyst prepared from H+-exchanged K2Ti2O5 with a layered structure exhibited a high activity (quantum yield = ca. 10%) for H2 evolution from aqueous methanol solution without any assistance of other materials such as Pt.
A Novel Synthesis of Phenylthiomethyl(PTM) Ethers and Esters by Anodic Oxidation of Phenyl Trimethylsilylmethyl Sulfide
Authors: Koizumi Toshio , Fuchigami Toshio , Nonaka Tsutomu
Published: July 2006

It was found that anodic oxidation of phenyl trimethylsilylmethyl sulfide in the presence of alcohols and carboxylic acids afforded various kinds of PTM ethers and esters, respectively, in good to reasonable yields.
Asymmetric Carbon Dioxide Fixation into Optically Active Propylene Carbonate by the Reactions of Propylene Bromohydrins
Authors: Takeichi Tsutomu , Ozaki Yoshiyuki , Takayama Yuzi
Published: July 2006

Asymmetric carbon dioxide fixation was achievd by the cyclization of propylene bromohydrins into chiral propylene carbonate of 38% enantiomeric excess in the presence of a chiral cobalt salen type complex.
An Efficient O-Monoalkylation of Dimethyl l-Tartrate via O-Stannylene Acetal with Alkyl Halides in the Presence of Cesium Fluoride
Authors: Nagashima Nobuo , Ohno Masaji
Published: July 2006

Selective O-monoalkylation of the vic-glycol of dimethyl l-tartrate with alkyl halides has been found to take place smoothly under mild conditions in the presence of cesium fluoride.
Dealumination of ZSM-5 Zeolites with Water
Authors: Sano Tsuneji , Suzuki Kunio , Shoji Hiroshi , Ikai Shigeru , Okabe Kiyomi , Murakami Tohru , Shin Shigemitsu , Hagiwara Hiroyuki , Takaya Haruo
Published: July 2006

Dealumination of a framework of H-ZSM-5 zeolites with water was investigated by 27Al MASNMR. It was found that the rate of dealumination is apparently second-order dependent on the concentration of framework aluminium.
Electrochemical Reduction of Carbon Monoxide to Hydrocarbons at Various Metal Electrodes in Aqueous Solution
Authors: Hori Yoshio , Murata Akira , Takahashi Ryutaro , Suzuki Shin
Published: July 2006

Electrochemical reduction of CO in an aqueous media was studied with voltammetric and coulometric measurements. The reduction did not proceed at Au and Pt electrodes. CO is appreciably reduced at Cu to hydrocarbons. Ni yielded products to some extent. The reaction was discussed in terms of the adsorption of CO or related intermediate species on the electrode.
(E)-(2-Bromoethenyl)dibromoborane. A New Precursor for (E)-1,2-Disubstituted Ethenes
Authors: Hyuga Satoshi , Chiba Yasumichi , Yamashina Naoko , Hara Shoji , Suzuki Akira
Published: July 2006

(E)-(2-Bromoethenyl)dibromoborane, prepared readily by the bromoboration of acetylene with tribromoborane, can be used as an effective precursor for the stereoselective synthesis of (E)-1,2-disubstituted ethenes.
Radical Polymerization of Alkoxyallenes
Authors: Yokozawa Tsutomu , Tanaka Masao , Endo Takeshi
Published: July 2006

The radical polymerizations of methoxyallene and phenoxyallene were carried out to obtain the polymers which consisted of two kinds of units polymerized by 1,2- and 2,3-double bonds of allenes in both cases.
Synthesis and Some Properties of the Complexes of Trithia- and Tetrathia[n](1,1′)ferrocenophanes with Cu(BF4)2. Intramolecular Redox Reaction in the Complexes
Authors: Sato Masaru , Akabori Sadatoshi , Katada Motomi , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

The complexes of 1,5,8,12-tetrathia[12]-, 1,5,9,13-tetrathia[13]-, and 1,5,9-trithia[9](1,1′)ferrocenophanes with Cu(BF4)2 were synthesized. In these complexes, the ferrocene nucleus was oxidized to a cationic ferricenium state and the Cu atom incorporated in the thiamacrocycle was reduced to a Cu(I) state.
Diazomethane Radical Cations as a Dipolarophile in the Dimeric Olefin Formation from Diazo-compounds
Authors: Ishiguro Katsuya , Sawaki Yasuhiko , Iwamura Hiizu
Published: July 2006

A novel cycloaddition mechanism involving diazomethane radical cations is proposed for the dimeric olefin formation by the one-electron oxidation of diazo-compounds. The preference of cis-stilbene formation from phenyldiazomethane is understood by a secondary orbital interaction of phenyl groups on the cycloaddition step.
Crystal and Molecular Structure of Tropothione at −40 °C
Authors: Machiguchi Takahisa , Mizuno Hiroshi , Hasegawa Toshio , Ishii Yukiko , Otani Hiroyuki
Published: July 2006

An X-ray analysis of thermally unstable tropothione (1) has revealed a conspicuous packing of anti-parallel arrangement in sheets quite different from that of the parent tropone, an approximate planar carbon ring, and an especially longer C=S bond than that in diphenylcyclopropenethione. The bond alternation of 1 is also confirmed by NMR simulation analysis.
Scanning Tunneling Microscopy with Atomic Resolution in Aqueous Solutions
Authors: Itaya Kingo , Sugawara Shizuo
Published: July 2006

A scanning tunneling microscope was constructed for in-situ electrochemical studies. The apparatus could provide atomic resolution of a highly oriented pyrolytic graphite (HOPG) surface in both air and aqueous solutions. The electrodeposition of platinum (Pt) on the surface of HOPG was investigated.
A Straightforward Synthesis of Allyl Amines from α-Amino Acids without Racemization
Authors: Moriwake Toshio , Hamano Shin-ichi , Saito Seiki , Torii Sigeru
Published: July 2006

An extremely simple and practical synthesis of allyl amine derivatives from α-amino acids has been developed involving aldehyde olefination pathway with AlMe3–Zn–CH2I2 reagent which has proven to be crucial for preservation of stereochemical integrity.
A Convenient Preparation of Pure Dialkylmagnesium from a Grignard Reagent
Authors: Saheki Yukitami , Sasada Katsuhiko , Satoh Nobumasa , Kawaichi Noriyuki , Negoro Kenji
Published: July 2006

Dimethyl ether of acyclic polyethers, Me(OCH2CH2)nOMe, predominantly coordinated to MgX2 in an ether solution of Grignard reagent and the MgX2 adduct was removed as a precipitate. Consequently, an ethereal solution of pure R2Mg was obtained in reasonable yield. This method is more convenient than those known general.
Stereochemical Control in Intramolecular Ene Reactions of Crotyl Propargyl Ether Systems
Authors: Mikami Koichi , Takahashi Kazuhiko , Nakai Takeshi
Published: July 2006

Stereochemical features are described of the title reactions leading to the γ-alkylidene-β-vinyloxolanes. Of particular interest is the high 1,2-trans diastereoselectivity observed for the (α-alkyl)crotyl and (α,β-dialkyl)crotyl ether systems with methoxycarbonyl group at the acetylenic terminus which remarkably facilitates the ene cyclization.
Oxidation of Olefins with Benzenetellurinic Anhydride
Authors: Kambe Nobuaki , Tsukamoto Takashi , Miyoshi Noritaka , Murai Shinji , Sonoda Noboru
Published: July 2006

Olefins were found to be oxidized by use of benzenetellurinic anhydride in acetic acid leading to vic-diacetates. Benzenetellurenic acid derivatives formed in situ are suggested as the active species. This diacetoxylation proceeds in net syn fashion probably via anti acetoxytellurenylation of the olefin followed by displacement of the phenyltelluro group by an acetoxy group with inversion.
Chemical Deposition in Liquid Phase (CDL). A Convenient Method for Cobalt- or Nickel-coating of Carbon Fibers Using Zerovalent Organometallic Compounds
Authors: Su Shuenn-Kung , Akiba Masatsugu , Takahashi Tamotsu , Saburi Masahiko , Hidai Masanobu , Uchida Yasuzo
Published: July 2006

Co2(CO)8 and Ni(COD)2 (COD=1,5-cyclooctadiene) can be used for Co- and Ni-coating of carbon fibers, respectively, by the chemical deposition in liquid phase (CDL) method in sharp contrast to the chemical vapor deposition (CVD) method which requires vaporization of organometallic compounds.
A Synthesis of (3S,4R)-3-[(R)-1-(t-Butyldimethylsilyloxy)ethyl]-4-carboxymethyl-2-azetidinone, the Thienamycin Intermediate, from (S)-Ethyl Lactate
Authors: Ito Yoshio , Terashima Shiro
Published: July 2006

The title thienamycin intermediate was efficiently synthesized from (S)-ethyl lactate (3) by subjecting (3S,4S)-3-acetyl-4-[(S)-1-benzyloxyethyl]-2-azet idi none readily obtainable from 3, to sequential reactions in which base catalyzed elimination and regioselective hydroboration were employed as the key processes.
6-(3-Guaiazulenyl)-5-isopropyl-3,8-dimethyl-1(6H)-azulenone and Its Norcaradiene-Isomer. Key Intermediates for Novel Intermolecular One-Carbon Transfer in Autoxidation of Guaiazulene
Authors: Matsubara Yoshiharu , Takekuma Shin-ichi , Yamamoto Hiroshi , Nozoe Tetsuo
Published: July 2006

Autoxidation of guaiazulene either at 85 °C in N,N-dimethylformamide-0.5 M sulfuric acid or at 25–35 °C on the surface of a filter paper yielded, together with other products, the two title compounds which were shown to be in equilibrium and to constitute important intermediates for the intermolecular one-carbon transfer reactions frequently observed during autoxidation of many azulenic hydrocarbons.
Isolation of Potassium Chelidonate as a Bioactive Substance Concerning with Circadian Rhythm in Nyctinastic Plants
Authors: Miyoshi Eiichi , Shizuri Yoshikazu , Yamamura Shosuke
Published: July 2006

In an effort to search for stimulants concerning with circadian rhythm in several nyctinastic plants, potassium chelidonate was isolated as a bioactive substance from the plant Cassia mimosoides L. and C. occidentalis L. This potassium salt has been proved to be quite effective for leaf-closing of the plants Mimosa pudica, Cassia mimosoides L. and others.
Change of Raman Scattering Intensity of a Polypyrrole Film during Reversible Doping and Emitting Processes of ClO4−
Authors: Inoue Tooru , Hosoya Ikuo , Yamase Toshihiro
Published: July 2006

Symmetric and antisymmetric streching modes were observed in an in situ Raman scattering response of a polypyrrole (PPY) film electrode in the course of a redox doping and emitting of a ClO4− anion. Anion doping arose a deformation of PPY conformation due to a complex formation between ClO4− and a positive hole.
A Striking Effect of H2S Treatment of Catalyst on the Improvement of Acetic Acid Selectivity in High Pressure CO Hydrogenation over Rh–Ir–Mn–Li/SiO2
Authors: Nakajo Tetsuo , Arakawa Hironori , Sano Ken-ichi , Matsuhira Shinya
Published: July 2006

A selective synthesis of acetic acid from syngas was investigated. Acetic acid was produced with nearly 70% selectivity in carbon efficiency over H2S-modified Rh–Ir–Mn–Li/SiO2 catalyst at the expense of the activity. The role of H2S modification was also studied.
Electrochemical Reaction of CO2 with Me2NH to Afford N,N-Dimethylformamide, Catalyzed by [Ru(bpy)2(CO)2]2+ (bpy = 2,2′-bipyridine)
Authors: Ishida Hitoshi , Tanaka Hiroaki , Tanaka Koji , Tanaka Toshio
Published: July 2006

Electrochemical CO2 reduction catalyzed by [Ru(bpy)2(CO)2]2+ in the presence of Me2NH and Me2NH·HCl in anhydrous acetonitrile catalytically produces HCOO− and N,N-dimethylformamide (DMF) with current efficiency 75.7 and 21.4%, respectively, via the carbamoyl Ru(II) complex as an intermediate, whose formation was confirmed by FT-IR and 1H NMR spectra.
Inclusion Compounds of Cholic Acid with a Variety of Organic Substances
Authors: Miyata Mikiji , Shibakami Motonari , Goonewardena Wyjayanthi , Takemoto Kiichi
Published: July 2006

Cholic acid was found to form inclusion compounds with a great variety of organic substances, such as aliphatic, alicyclic and/or aromatic alcohols, ketones, aldehydes, ethers, carboxylic acids, esters, and nitriles. The molar ratios of host to guest components were 1:1 in almost all cases.
Regio- and Stereoselective Synthesis of Allylic and Homoallylic Alcohols by the Reductive Desulfonylation of Allylic Sulfone Derivatives. Application to the Syntheses of (±)-Lavandulol and Isolavandulol
Authors: Inomata Katsuhiko , Igarashi Susumu , Mohri Mitsunobu , Yamamoto Taku , Kinoshita Hideki , Kotake Hiroshi
Published: July 2006

Regio- and stereoselective desulfonylation of β-tosylhomoallylic alcohols provided a convenient method for the preparation of allylic and homoallylic alcohols. (±)-Lavandulol and isolavandulol were synthesized in excellent yields by this method.
Direct Evidence Supporting a Dimer Structure of Stable Radical Intermediate Appeared in the Grignard Reaction
Authors: Maruyama Kazuhiro , Katagiri Toshimasa
Published: July 2006

A pink colored intermediate radical which appeared in the Grignard reaction of 2-methylbenzophenone in THF showed a well-resolved ESR spectrum of 2-methylbenzophenone anion radical at room temperature and a clear ESR spectrum of triplet radical pair in rigid state, which suggested that this radical species consisted of two 2-methylbenzophenone anion radicals and a dimer di-cation of Grignard reagent.
High Temperature Catalytic Combustion over Cation-substituted Barium Hexaaluminates
Authors: Machida Masato , Eguchi Koichi , Arai Hiromichi
Published: July 2006

The combustion activities of various oxide catalysts were investigated using BaO·6Al2O3 as support. Conventional impregnation of oxide catalysts only lead to a decrease in surface area of the support. Cation-substituted barium hexaaluminates generally retained the large surface area. In particular, BaMnAl11O19−α′, showed the excellent activity and the large surface area of 13.7 m2/g after calcination at 1300 °C.
Electrochemical Synthesis of Blue Molybdosulfate Complexes
Authors: Hori Toshitaka , Sugiyama Masahito , Himeno Sadayuki
Published: July 2006

Controlled potential electrolysis (CPE) of a Na2MoO4/H2SO4/40% (v/v) CH3 CN system produced two types of blue molybdosulfate complexes which were isolated as tetramethylammonium-, guanidine-, and choline-salts. The ratios of Mo(VI) : Mo(V) : S(VI) in the complexes were confirmed as 7:2:1 and 3:3:4.
Kinetic Studies on the Inclusion Reaction of Ethylenediamine Mono-substituted α-Cyclodextrin with Sodium p-(3-t-Butyl-4-hydroxyphenylazo)benzenesulfonate in Aqueous Solution
Authors: Monzen Hiroyuki , Yoshida Noboru , Fujimoto Masatoshi
Published: July 2006

Kinetics of the inclusion reactions of the title azo compound having negative charge and an α-cyclodextrin derivative with positive charge is investigated by means of stopped-flow method. A two-step inclusion mechanism is proposed.
Kinetic Resolution of 2-Formyl-1,1′-binaphthyls by Baker’s-Yeast Reduction of the Formyl Function
Authors: Kawahara Kan , Matsumoto Masayoshi , Hashimoto Harukichi , Miyano Sotaro
Published: July 2006

Baker’s-yeast reduction of 2-formyl-1,1′-binaphthyls gave the corresponding optically active 2-hydroxymethyl-1,1′-binaphthyls with the enantiomeric excess reaching up to 70% at 39% conversion in the case of 2-formyl-2′-methoxy-1,1′-binaphthyl.
Selectivity Series in the Adsorption of Metal Ions on a Resin Prepared by Crosslinking Copper(II)-Complexed Chitosan
Authors: Inoue Katsutoshi , Baba Yoshinari , Yoshizuka Kazuharu , Noguchi Hiroyuki , Yoshizaki Makoto
Published: July 2006

The pH dependencies in the adsorption of various metal ions on a resin prepared by crosslinking copper(II)-complexed chitosan were investigated. Separations of gallium and indium from zinc, ferric iron and aluminum from zinc, and nickel from cobalt were possible with high selectivity by this resin. Some applications to hydrometallurgical processes are also proposed.
Vibrational Analysis of Evaporated Si and SiO Film by Inelastic Electron Tunneling Spectroscopy
Authors: Higo Morihide , Nishino Kouichi , Hayashi Hiroki , Kamata Satsuo
Published: July 2006

Inelastic electron tunneling spectroscopy has been used for obtaining the vibrational spectra of the thin films of evaporated Si and SiO. The analysis of the tunneling spectra shows the formation of SiH species. These hydrides are formed from the reaction with residual water molecules in the vacuum system during the evaporation.
Solid-State NMR of H3PW12O40·nH2O and H3PW12O40·6C2H5OH
Authors: Kanda Yuji , Lee Kwan Young , Nakata Shin-ichi , Asaoka Sachio , Misono Makoto
Published: July 2006

High-resolution solid-state 1H and 31P NMR revealed that there were at least three different states for protons of H3PW12O40·nH2O; (i) protons present in highly hydrated samples, (ii) protonated water which is hydrogen-bonded to terminal oxygen, W = O···H+ (H2O)2 (n \doteqdot 6), and (iii) proton which is directly bonded to bridging oxygen, W–OH–W (n \doteqdot 0). When water was replaced by ethanol, a protonated ethanol species was detected by 1H, 13C, and 31P NMR.
Electro-catalytic Activity on Supported Platinum Crystallites for Oxygen Reduction in Sulphuric Acid
Authors: Watanabe Masahiro , Saegusa Sigeru , Stonehart Paul
Published: July 2006

The purpose of this paper is to give a clear explanation to the “lost activity” of highly dispersed platinum catalysts caused by the so-called crystallite size effect and to demonstrate the complete recovery of the lost activity by using a series of high surface area carbon black supports, i.e. even at platinum crystallite size of 1.4 nm.
Trityl Salt Catalyzed Aldol Reaction between α,β-Acetylenic Ketones and Silyl Enol Ethers
Authors: Kobayashi Shu , Matsui Shigekazu , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl salt, α,β-acetylenic ketones react with silyl enol ethers to afford the corresponding aldol adducts (1,2-addition products) stereoselectively in high yields. Naturally occurring monoterpenes, trans- and cis-tagetones, are synthesized by the use of this reaction.
Oxidation of Allene Episulfide. Selective Sulfur Oxidation and Novel Isomerization of Resulting S-Oxide
Authors: Tokitoh Norihiro , Itami Akihiko , Ando Wataru
Published: July 2006

Oxidation of several kinds of substituted allene episulfides was investigated using peracid and singlet oxygen to show an interesting substituent effect on the oxidation products. Thermal and acid-catalyzed isomerization of resulting allene episulfide S-oxide was also described.
A Novel Method for the Generation of Thial S-Sulfides from 2,4,6-Trisubstituted 5,6-Dihydro-1,3,5-dithiazines
Authors: Takikawa Yuji , Makabe Takahiro , Hirose Naoyuki , Hiratsuka Takamichi , Takoh Ryuji , Shimada Kazuaki
Published: July 2006

Treatment of 2,4,6-trisubstituted 5,6-dihydro-1,3,5-dithiazines with NCS or NBS afforded highly reactive thial S-sulfides, which underwent dimerization to give the corresponding 1,2,4,5-tetrathianes. The products were also selectively converted into naturally-occurring cyclic polysulfides, 1,2,4-trithiolanes and 1,2,3,5,6-pentathiepanes, by treatment with Ph3P, KCN, or Na2S4.
57Fe-Mössbauer Spectroscopic Studies of a New Series of Mixed-valence Biferrocenium Salts
Authors: Kai Masahiro , Katada Motomi , Sano Hirotoshi
Published: July 2006

Biferrocenium and 1′,1'″-dihalobiferrocenium tetrachloroferrate(III) and dibromocuprate(I) were prepared by a new method. It was found by 57Fe-Mössbauer spectroscopy that the valence states of their iron atoms and the temperature dependence were quite different from those of the corresponding biferrocenium and 1′,1'″-dihalobiferrocenium triiodide salts.