bluuebunny/crossref_metadata_2025 huggingface dataset:
“SODIUM PERCARBONATE” (SPC) AS A HYDROGEN PEROXIDE SOURCE FOR ORGANIC SYNTHESIS
Authors: Ando Takashi , Cork David G , Kimura Takahide
Published: July 2006

“Sodium percarbonate” (SPC) is an inexpensive, stable, safe and commercially available material which may be used as a hydrogen peroxide source for organic synthesis. Epoxidation, amine and sulfide oxidation reactions were simply performed with the solid reagent in moderate to excellent yield.
A NEW DRY-TYPE ADSORBENT OF CHELATE RESIN-IRON(II) COMPLEXES. PREPARATION AND ADSORPTION OF NITROGEN OXIDE
Authors: Toshima Naoki , Asanuma Hiroyuki , Hirai Hidefumi
Published: July 2006

A new dry-type adsorbent was prepared by washing the chelate resin beads holding iron(II) with a hydrophilic organic solvent, followed by vacuum drying. It adsorbed more than 99% of nitrogen oxide from 6 dm3 of nitrogen gas containing 980 ppm nitrogen oxide in 25 min. The nitrogen oxide adsorbed on the adsorbent was able to be desorbed by raising temperature up to 100 °C under vacuum.
LOW TEMPERATURE PLASMA OXIDATION TREATMENT OF SEVERAL ORGANIC PIGMENTS
Authors: Ihara Tatuhiko , Itô Seisirô , Kiboku Mitsuo
Published: July 2006

The modification of the surface of organic pigment by polarization applying the surface treating method by the low temperature oxygen plasma to several organic pigments were investigated.
PREPARATION OF SiO2 POWDER CONTAINING FINE γ-Fe2O3 PARTICLES
Authors: Akiyama Tadashi , Tanigawa Eiji , Ida Takashi , Tsuiki Hideyasu , Ueno Akifumi
Published: July 2006

Fine γ-Fe2O3 particles dispersed in SiO2 powder was prepared by simultaneous hydrolysis of mixed alkoxides solution composed of ethyl silicate and Fe-ethylene glycolate and the magnetic properties of this powder were discussed with an aid of TEM measurement.
CARBON-SKELETON REARRANGEMENT OF ALKYL LIGANDS COORDINATED TO HYDROPHOBIC VITAMIN B12 DERIVATIVES IN MOLECULAR AGGREGATES
Authors: Murakami Yukito , Hisaeda Yoshio , Ohno Teruhisa , Matsuda Yoshihisa
Published: July 2006

The carbon-skeleton rearrangement of alkyl ligands coordinated to hydrophobic vitamin B12 derivatives took place in molecular a aggregates formed with CTAB, Triton X-100, or N,N-didodecyl-Nα-[6-(trimethylammonio)hexanoyl]-l-alaninamide bromide more favorably than the reaction in methanol or benzene under anaerobic conditions in the dark.
A NOVEL AND BIOMIMETIC SYNTHESIS OF (±)-CHELAMINE, (±)-CHELIDONINE, SANGUINARINE, AND DIHYDROSANGUINARINE FROM COPTISINE VIA A COMMON INTERMEDIATE
Authors: Hanaoka Miyoji , Yoshida Shuji , Annen Masami , Mukai Chisato
Published: July 2006

(±)-Chelamine and (±)-chelidonine, B/C cis hexahydrobenzo[c]phenanthridxne alkaloids were stereoselectively synthesized from coptisine via the key intermediate, which was also converted to fully aromatized benzo[c]phenanthridine alkaloids, sanguinarine and dihydrosanguinarine.
A NOVEL METHOD FOR CYCLOPENTANNELATION USING REGIOSELECTIVE ACYLATION OF ALLYLIC SULFIDES VIA α-SILYL INTERMEDIATES
Authors: Hiroi Kunio , Sato Hiroyasu , Kotsuji Kumiko
Published: July 2006

An aluminum chloride-catalyzed reaction of 1-(phenylthiotrimethylsilylmethyl)cyclohexene, readily obtainable from cyclohexanone, with acid chlorides in dichloromethane underwent a regioselective acylation at the γ-Position of the allylic system to give γ-acyl enol thioethers in good yields. Heating of these enol thioethers with an equimolar amount of p-toluenesulfonic acid produced 2-cyclopentenone derivatives. This novel method for cyclopentannelation provides a new entry to 2-cyclopentenone ring systems.
EXTERNAL MAGNETIC FIELD EFFECTS ON THE EMISSION INTENSITIES OF THE OH(A-X) AND CH(A-X) BANDS IN LOW PRESSURE C2H2/O2 AND C3H8/O2 FLAMES
Authors: Fukuda Yoshio , Abe Haruo , Hayashi Hisaharu , Imamura Takashi , Nagakura Saburo
Published: July 2006

Magnetic field effects on emission intensities of the CH(A-X) and OH(A-X) emission were studied with low pressure C2H2/O2 and C3H8/O2 flames produced by a microwave discharge of O2. When a magnetic field of 1.8 T was applied, the intensity of the CH(A-X) emission was reduced to 95% of that at zero field.
OXIDATION POTENTIALS OF NICKEL THIOLATES, AND Ni(III) SITES OF HYDROGENASES IN H2 UPTAKE BACTERIA
Authors: Yamamura Takeshi
Published: July 2006

Oxidation potentials of 15 nickel thiolates were surveyed in aprotic media with differential pulse polarography and cyclic voltammetry in terms of the nickel(III) site of hydrogenases of hydrogen uptake bacteria. The potential distribution of the thiolates in relation to the RS−/Ni ratio suggests that the number of the cysteinyl residues coordinating to the Ni(III) in the enzymes is 4 if there are no other kind of anionic residues around the metal.
DECOMPOSITION OF VITAMIN A BY NO2
Authors: Ohta Tomohiro , Suzuki Takahito , Kanoh Takako
Published: July 2006

Reactions of gaseous NO2 with Vitamin A’s (retinol and retinal) dissolved in CCl4 were carried out in test tubes. The concentrations of Vitamin A’s were monitored by HPLC using UV-VIS absorption spectrometry for each compound. These Vitamin A’s were found to be easily decomposed by bubbling NO2 through the solution at concentrations of the order of ppm in air at the flow rate of 30 ml/min.
CUBANE-TYPE CLUSTER [Mo4S4(NH3)12]Cl4·7H2O
Authors: Shibahara Takashi , Kawano Eiji , Okano Masami , Nishi Masahiro , Kuroya Hisao
Published: July 2006

Ammonia-coordinated cubane-type cluster complex [Mo4S4(NH3)12]Cl4·7H2O has been prepared from [Mo4S4(H2O)12]5+ and ammonia and the remarkably long MO–NH3 distance of 2.34 Å (av.) disclosed by X-ray structure analysis.
CONVERSION OF TETRABENZOBIS(THIOPYRANYLIDENE)ETHENE TO A NEW DONOR CONTAINING A PENTALENE SKELETON, DIBENZODITHIAACENAPHTHACENAPHTHYLENE, AND THEIR CHARGE TRANSFER COMPLEXES
Authors: Nakasuji Kazuhiro , Takatoh Kohki , Kotani Tomoyuki , Murata Ichiro , Yamochi Hideki , Saito Gunzi , Enoki Toshiaki , Inokuchi Hiroo
Published: July 2006

Dibenzodithiaacenaphthacenaphthylene was prepared from benzobis(thiopyranylidene)ethene. Both compounds are good electron donors and gave CT complexes with TCNQ, TCNQF4, and DDQ. The DDQ complexes represent the rare examples of CT complexes with relatively low resistivities despite having neither TTF-type donor nor TCNQ-type acceptor.
REDUCTION OF OXIMES WITH HYDROSILANE/H+ REAGENT
Authors: Fujita Makoto , Oishi Haruhito , Hiyama Tamejiro
Published: July 2006

Hydrosilane/H+ reagent reduced oximes in good yields. Stereospecific reduction of (2-acetoxy-1-phenylpropylidene)benzyloxyazane (3) was observed: the (E)-isomer gave erythro-1-phenyl-1-benzyloxyamino-2-propanol (4) in 99% selectivity, whereas (Z)-3 afforded the threo isomer of 4 in 76% selectivity.
MORPHOLOGY OF Ru PARTICLES ON Al2O3 AND ITS EFFECT ON SELECTIVITY IN CATALYTIC HYDROGENATION OF CARBON MONOXIDE
Authors: Lin Zheng-Zhong , Okuhara Toshio , Misono Makoto
Published: July 2006

Ru particles dispersed on Al2O3 were characterized by TEM, XRD, and H2 adsorption. It was shown that, after reduction by H2, Ru particles were aggregates of fine particles, and by oxidation and subsequent reduction they changed to large single crystallites of Ru. This change affected significantly the selectivity of CO hydrogenation in contrast to previous reports obtained for Ru/Al2O3 pretreated only by H2.
THE DIASTEREOSELECTIVE ADDITION OF TIN(II) ENOLATES DERIVED FROM CARBOXYLIC THIOESTERS TO α-IMINOESTER
Authors: Mukaiyama Teruaki , Suzuki Hiroshi , Yamada Tohru
Published: July 2006

The diastereoselective addition of the Sn(II) enolates derived from carboxylic thioesters to α-iminoester is described. The Sn(II) enolates of t-butylthiol esters react smoothly with α-iminoester to afford the corresponding β-aminoacid derivatives in good yield with high diastereoselectivity.
PREPARATION OF CARBON MONOXIDE ADSORBENT FROM COPPER(II) CHLORIDE AND ACTIVE CARBON
Authors: Hirai Hidefumi , Wada Keiichiro , Komiyama Makoto
Published: July 2006

A novel adsorbent of carbon monoxide is prepared by stirring 15.0 mmol of copper(II) chloride and 10.0 g of active carbon in water, followed by removal of the liquid phase at 0.06 mmHg, 180 °C. The adsorbent rapidly adsorbs carbon monoxide from 9:1 carbon monoxide-helium mixture under 1 atm at 20 °C, and the equilibrium amount of adsorbed carbon monoxide is 10.0 mmol.
SPECTROPHOTOMETRIC STUDY OF CLOSED-TUBE CHEMICAL TRANSPORT OF VANADIUM OXIDES WITH TeCl4
Authors: Ohtani Tsukio , Yamaoka Toshiyuki , Shimamura Koji
Published: July 2006

The in situ observations of the gaseous species in the closed-tube chemical transport systems, V2O3–TeCl4, V5O9–TeCl4, VO2–TeCl4, V6O13–TeCl4, and V2O5–TeCl4 were made by using an UV and VIS spectrophotometer which was improved for the high-temperature measurements. The measurements showed that a great majority of gaseous species in the transport tube is VOCl3 for all the systems, which is in agreement with the earlier result of the mass spectrometry on the VO2–TeCl4 system.
ENANTIOSELECTIVE PHOTOISOMERIZATION OF 1,3-BIS(9-ANTHRYL)PROPAN-1-OL IN POLY(METHYL-l-GLUTAMATE) MATRIX
Authors: Tazuke Shigeo , Miyamoto Yasushi , Ikeda Tomiki , Tachibana Kouzou
Published: July 2006

Photoisomerization(intramolecular photodimerization) of the title compound(I) proceeded enantioselectively in the matrix(II). The rate of reaction of the l-isomer is over 20% faster than that of the d-isomer. Induced circular dichroism(ICD) of I due to II matrix increased very much([Θ]>106) with the progress of the reaction. The origin of enantioselectivity was discussed in relation to the change in ICD.
MAGNETIC FIELD EFFECT ON PHOTOCROSSLINKING REACTION OF BROMO- AND CHLOROMETHYLATED POLYSTYRENE
Authors: Mokita Hiroshi , Higasayama Ichiro , Yamaoka Tsuguo
Published: July 2006

Photocrosslinking efficiency of bromo- and chloromethylated polystyrene sensitized by 2,4-diisopentylthioxanthone was evaluated in a thin film by measuring the gel fraction of the polymer irradiated with UV(λ>330 nm) light. By the application of an external magnetic field of 70 mT, the gel fraction increases and photocrosslinking efficiency is enhanced by ≈36%.
ASYMMETRIC OXIDATION OF SULFIDES TO SULFOXIDES WITH TRIVALENT IODINE REAGENTS
Authors: Imamoto Tsuneo , Koto Hiroyasu
Published: July 2006

New trivalent iodine reagents possessing chiral center were generated by the reaction of iodosylbenzene with the derivatives of L-tartaric anhydride. The reagents cleanly oxidize prochiral sulfides to optically active sulfoxides with substantial asymmetric induction.
A FACILE PREPARATION OF TELLUROL ESTERS FROM PHENYLTELLUROTRIMETHYLSILANE AND ACYL CHLORIDES
Authors: Sasaki Kazuaki , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Phenyltellurotrimethylsilane cleanly reacted with acyl chloride, giving tellurol ester in an excellent yield. The high reactivity of tellurol ester toward lithium organocuprate was demonstrated.
RESOLUTION OF ENANTIOMERS BY HPLC ON CELLULOSE TRANS- AND CIS-TRIS(4-PHENYLAZOPHENYLCARBAMATE)
Authors: Okamoto Yoshio , Sakamoto Hideaki , Hatada Koichi , Irie Masahiro
Published: July 2006

Cellulose tris(4-phenylazophenylcarbamate) (CPAPC) having azobenzene pendant groups was adsorbed on silica gel to use as a chiral stationary phase for HPLC. Pure trans-CPAPC resolved many racemic compounds, whereas 70% cis-CPAPC showed very poor resolving power.
On the Mechanism of Peptide Cleavage by Carboxypeptidase A and Related Enzymes
Authors: Breslow Ronald , Schepartz Alanna
Published: July 2006

The evidence so far available indicates that carboxypeptidase A uses the general base mechanism for peptide hydrolysis. Based on model studies, the Glu-270 carboxylate probably performs three different proton transfers.
High Selectivity of Sulfided NiW/Al2O3 Catalyst in Desulfurization of Dibenzothiophene in the Presence of Nitrogen-Containing Compounds
Authors: Nagai Masatoshi
Published: July 2006

The presence of nitrogen compounds greatly improved the selectivity of a sulfided NiW/Al2O3 catalyst for the direct desulfurization of dibenzothiophene to biphenyl. Elemental sulfur precipitated after the reaction.
Solvolysis of 1-Phenyl-1-cyano-2,2,2-trifluoroethyl Brosylate
Authors: Fujiyama Ryoji , Kamimura Ippei , Yoshida Masaya , Suzuki Kojiro , Kiyooka Syun-ichi , Murata Akihisa , Goto Mutsuo , Fujio Mizue , Tsuno Yuho
Published: July 2006

The rates of solvolysis of 1-phenyl-1-cyano-2,2,2-trifluoroethyl brosylate were measured in various solvents, and the solvent effect was analyzed on the basis of Winstein–Grunwald Eq., giving m=0.88 and l=0.49.
Norrish Type II Photoreaction of 2,3-Dihydro-2,3-methano-1,4-naphthoquinones. A Novel Photorearrangement of α, β-Cyclopropyl Ketone to β, γ-Unsaturated Ketone
Authors: Osuka Atsuhiro , Shimizu Hirohito , Suzuki Hitomi , Maruyama Kazuhiro
Published: July 2006

Irradiation of the title compounds gave cyclobutanols as the initial type II cyclization products, which were further photochemically rearranged to tricyclic β, γ-unsaturated ketones presumably via homolytic fission of cyclopropane ring followed by 1,2-alkyl migration.
The Ene Reaction of Allylsilanes with Singlet Oxygen. Unusual Product Stereoselectivity
Authors: Shimizu Nobujiro , Shibata Fumihiro , Imazu Sachiko , Tsuno Yuho
Published: July 2006

Dye-sensitized photooxidations of allyltrimethylsilanes yield cis ene products predominantly in contrast to the highly stereoselective formation of trans ene products from carbon standards.
ESR Spin-Trapping Technique for Partial Structural Characterization of the Radicals Leached Out of a Plasma-Driven Ultrathin Film
Authors: Kuzuya Masayuki , Nakai Sachihiko , Ito Akiko
Published: July 2006

The partial structure of the radicals leached out of a plasma-driven ultrathin film was characterized by the ESR spectral measurements with the aid of computer simulations obtained from the reactions for 2,4,6-tri-t-butylnitrosobenzene (BNB) spin-adduct formation in various organic plasma-exposed glass ampules.
Photoinduced Allylation of Aromatic Carbonyl Compounds by Allylic Stannanes
Authors: Takuwa Akio , Tagawa Hiroyuki , Iwamoto Hidetoshi , Soga Osamu , Maruyama Kazuhiro
Published: July 2006

Irradiation of aromatic carbonyl compounds and allyl-, 2-methyl-2-propenyl-, or 3-methyl-2-butenyltrimethylstannanes in acetonitrile afforded δ,γ-unsaturated alcohols as major product. A photoinduced electron transfer mechanism is proposed for the allylations.
Prostaglandin Synthetase Inhibitors from the African Medicinal Plant Ozoroa mucronata
Authors: Kubo Isao , Kim Mujo , Naya Keizo , Komatsu Sakae , Yamagiwa Yoshiro , Ohashi Kinji , Sakamoto Yoshitaka , Hirakawa Shinji , Kamikawa Tadao
Published: July 2006

Two prostaglandin synthetase inhibitory anacardic acids were isolated from O. mucronata. The structures of these inhibitors were established by spectroscopic means. Efficient syntheses of these two via directive metallation were reported.
Unusual Regioselectivity in the Carbonylation of Substituted Benzenes via the C–H Activation Catalyzed by RhCl(CO)(PMe3)2
Authors: Sakakura Toshiyasu , Tanaka Masato
Published: July 2006

Meta-substituted benzaldehydes were obtained as the major product in the carbonylation of mono-substituted benzenes via the C–H activation catalyzed by RhCl(CO)(PMe3)2 under irradiation.
An Efficient and Convenient Method for the Asymmetric Allylation of Aldehydes with Allyltrimethylsilane Catalyzed by Diphenylboryl Triflate
Authors: Mukaiyama Teruaki , Ohshima Masahiro , Miyoshi Norikazu
Published: July 2006

In the presence of a catalytic amount of diphenylboryl triflate, aldehydes smoothly react with (S)-1-phenyl-1-trimethylsilyloxyethane and allyltrimethylsilane to afford the chiral homoallyl ethers in good yields with high stereoselectivities.
Novel Three-dimensional Host Structure Revealed in the Crystal Structure of N-Methyl-1,3-diaminopropanecadmium(II) Tetracyanonickelate(II)–Cyclohexane(2/1)
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake
Published: July 2006

The cavity accommodating the guest cyclohexane molecule in the title clathrate compound is topped and bottomed by the two-dimensionally extended catena-[cadmium(II) tetra-μ-cyanonickelate(II)] networks and walled by the chelate ring of the N-methyl-1,3-diaminopropane coordinate to the Cd atom and by another tetracyanonickelate (II) linkage involving the Cd atom.
Stereocontrolled First Total Synthesis of Mycinolide IV
Authors: Suzuki Keisuke , Matsumoto Takashi , Tomooka Katsuhiko , Matsumoto Kazutsugu , Tsuchihashi Gen-ichi
Published: July 2006

First total synthesis of mycinolide IV (2) was accomplished. Novel rearrangement of epoxyalcohol derivatives was applied to the synthesis of the C(11)–C(17) portion, assembly of which with the C(1)–C(10) portion (prepared via pinacol-type rearrangement) enabled a simple and stereoselective synthesis of 2
Strong Participation of the 1-Methyl Group in Diazotization Reaction of 9-Aminomethyl-1,4-dimethyltriptycene
Authors: Yamamoto Gaku , Oki Michinori
Published: July 2006

The title reaction in acetic acid gave 5-methyl-1,2,6,10b-tetrahydro-6,10b-o-benzenoaceanthrylene and 1-acetoxymethyl-4,9-dimethyltriptycene as major products and only small amounts of skeletally rearranged homotriptycene derivatives to indicate strong participation of the peri-methyl group in the reaction.
Effect of Ligand-Exchange Reaction on Longitudinal Magnetization Recovery in Aqueous-Al(III) NMR
Authors: Ichikawa Kazuhiko , Jin Takashi
Published: July 2006

The effect of chemical exchange on the longitudinal magnetization recovery (LMR) was investigated by means of the 27Al NMR in aqueous Al2(SO4)3 solution. It was elucidated for the first time that in the case of the rapid ligand-exchange between [A1(H2O)5SO4]+(A) and [Al(H2O)6]3+(B) the slope of a single exponential decay in the observed LMR gives a slow rate R1,B(<R1,A) of the time evolution of the longitudinal magnetization under the presence of energy relaxation as well as chemical exchange. The value of R1,B at the rapid exchange limit becomes equal to fAR1,A*+fBR1,B* as reported so far, where R1,α* is energy relaxation rate at site α.
A New Entry to 1,2,4-Benzenetriol Congeners
Authors: Ozaki Yutaka , Kim Sang-Won
Published: July 2006

1,2,4-Benzenetriol derivatives were efficiently prepared from annulation of α,α-bis(ethylthio)carbonyl compounds with α,β-unsaturated carbonyl compounds.
Hydrogenation of Propionaldehyde by Nickel Catalysts Supported on Al2O3, SiO2, TiO2, Ta2O5,and Nb2O5
Authors: Funakoshi Masaki , Inoue Hakuai
Published: July 2006

The hydrogenation of propionaldehyde with various nickel catalysts was studied kinetically for a wide range of reaction conditions. The catalysts were supported on Al2O3, SiO2, TiO2, Ta2O5, and Nb2O5. The reaction rates were well correlated with the irreversibly adsorbed hydrogen uptakes. A detailed analysis concluded that this reaction was structure-insensitive under all reaction conditions tested.
The Effect of Surface Hydroxyl Groups upon the Deactivation of Excited Triplet Acetone Adsorbed on Porous Vycor Glass
Authors: Anpo Masakazu
Published: July 2006

H-D exchange between deuterated surface hydroxyl groups and excited triplet acetone has been observed on porous Vycor glass, proceeding via a surface hydroxyl group-assisted photoenolization of acetone. This chemical process evidences that surface hydroxyl groups play a significant role in determining the fate of the excited triplet acetone adsorbed on Vycor glass by a strong hydrogen bonding.
Efficient Synthesis of 7-Methoxymitosene from 6-Methylindole
Authors: Nakatsuka Shin-ichi , Asano Osamu , Goto Toshio
Published: July 2006

An efficient synthesis of 7-methoxymitosene from easily available 6-methylindole was achieved by 17 steps in 3.0% overall yield.
Stereoselective Syntheses of (+)-Davanone and (+)-Artemone via Anti-selective Epoxidation and Iodo-cyclization
Authors: Honda Yutaka , Ori Aiichiro , Tsuchihashi Gen-ichi
Published: July 2006

Chiral sesquiterpenes, (+)-Davanone and (+)-Artemone, were synthesized via anti-selective epoxidation and iodo-cyclization by the use of (S)-ethyl lactate as a chiral source.
183W NMR Spectra of Some Di- and Tri-nuclear Clusters of Tungsten(III), (IV), and (V)
Authors: Nagasawa Akira , Sasaki Yoichi , Wang Bateer , Ikari Shinji , Ito Tasuku
Published: July 2006

183W chemical shifts of [WIII2Cl9]3−, [WIV3(O)4,(NCS)9]5−, [MIV3(O)2(CH3COO)6(H2O)3]2+ (M3 = Mo3, Mo2W, MoW2, and W3), and [MV2(O)4(edta)]2− (M = Mo and W) show clear trends that the shielding at W atom increases, with an increase in the oxidation state, and upon replacement of W with Mo in a series of the mixed-metal(IV) complexes.
An Efficient and Convenient Method for the Preparation of α-Methylenated Ketones from Silyl Enol Ethers
Authors: Hayashi Masaji , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of stannous halide, silyl enol ethers react with bromomethyl methyl ether to give the corresponding α-bromomethyl ketones, which are smoothly converted to α-methylenated ketones on the successive addition of tertiary amine by one-pot procedure. This method is successfully applied to a synthesis of sarkomycin intermediate.
Enantioselective Synthesis of Optically Pure Amino Alcohol Derivatives by Yeast Reduction
Authors: Fujisawa Tamotsu , Hayashi Hiroki , Kishioka Yoshino
Published: July 2006

Baker’s yeast reduction of nitro- and imide-containing ketones gives the corresponding secondary alcohols in good yields with excellent optical purity. Among the imide groups examined, the ketones with saccharin moiety give the products in the best chemical and optical yields.
Redox Potential of BrCN-Modified Metmyoglobin/Deoxymyoglobin System
Authors: Tsukahara Keiichi
Published: July 2006

A redox potential of the BrCN-modified metmyoglobin was determined spectrophotometrically to be 0.18 V by using [Ru(NH3)6]2+ as a redox partner. The self-exchange rate constant for the modified myoglobin system was evaluated to be 1×104 dm3 mol−1 s−1 based on the Marcus theory, being larger than that for its native system.
Novel Reactions of Metal Acetylacetonatas with Formaldehyde in Relation to Formose Reaction
Authors: Takeichi Tsutomu , Sakurada Yoshihiro , Hieda Yoshihiro , Takayama Yuzi
Published: July 2006

The reaction of metal acetylacetonates with formaldehyde in water or methanol gave 4-hydroxy-3,3-bis(hydroxymethyl)-2-butanone and 5-oxa-3,3-bis(hydroxymethyl)-2-hexanone, respectively.
Hypervalent Organoiodine-Promoted Oxidative Ring Expansions of Tributylstannyl Lactols. New and General Synthesis of Unsaturated Medium-Ring Lactones
Authors: Ochiai Masahito , Iwaki Shigeru , Ukita Tatsuzo , Nagao Yoshimitsu
Published: July 2006

A new ring expansion route to olefinic lactones was developed. Oxidative 1,4-fragmentation of tributylstannyl lactols utilizing (diacetoxyiodo)bezene under mild conditions gave unsaturated medium-ring lactones stereospecifically in good yields. The relative stereochemistry of tributylstannyl group of the lactols determines the double bond geometry of the lactones.
Preparation and Reaction of γ-Ethoxy and (Phenylthio)allenylstannanes
Authors: Takeda Takeshi , Ohshima Hiroyuki , Inoue Masami , Togo Akira , Fujiwara Tooru
Published: July 2006

γ-Ethoxyallenylstannane was obtained by the reaction of 2-ethoxy-3-alkynenitrile or 1-ethoxy-1-(phenylthio)-2-alkyne with tributylstannyllithium in good yield. The reaction of 1,1-bis-(phenylthio)-2-alkyne with tributylstannylcopper(I) reagent gave γ-(phenylthio)allenylstannane which, in turn, was treated with acetal in the presence of TiCl4, to afford the propargyl sulfide derivative predominantly.
C-2 Epimerization of Aldoses Promoted by Combination of Monoamines and Alkaline Earth or Rare Earth Metal Ions, Involving a Rearrangement of the Carbon Skeleton
Authors: Tanase Tomoaki , Murata Takashi , Yano Shigenobu , Hidai Masanobu , Yoshikawa Sadao
Published: July 2006

Aldoses are rapidly epimerized at C-2 by combination of alkaline earth or rare earth metal ions (Ca2+, Sr2+, Pr3+, or Ce3+) and monoamines (triethylamine etc.). 13C NMR studies using [1-13C]-d-glucose of the Ca2+ system revealed that this reaction proceeds via the stereospecific rearrangement of carbon skeleton.
Closed-Tube Chemical Transport of VxSe2 by Iodine. Observation of Pressure Gradient of Selenium Vapor in a Transport Tube
Authors: Ohtani Tsukio , Kohashi Tetsuya
Published: July 2006

The pressure gradient of selenium vapor was observed in the closed-tube chemical transport of VxSe2 + I2 system, by using the specially designed transport tube. Vapor pressure of selenium decreases almost linearly with distance x of the tube from the hot to the cold zone. This was explained by the steady-state gas diffusion process by comparison with the transport rate.
1-Methyl-1-boracyclohepta-2,4,6-triene, the First C-Unsubstituted Borepin
Authors: Nakadaira Yasuhiro , Sato Ryuji , Sakurai Hideki
Published: July 2006

The first C-unsubstituted boracycloheptatriene, 1-methylborepin, is prepared and characterized spectroscopically. Some extent of conjugation through boron atom is suggested.
Studies on the Structure of Cationic Dimer of Molybdenum(VI) in Acidic Solution by XANES and EXAFS
Authors: Yokoi Kunihiko , Matsubayashi Nobuyuki , Miyanaga Takafumi , Watanabe Iwao , Murata Katsuo , Ikeda Shigero
Published: July 2006

Structure of the cationic dimer of molybdenum(VI) species in acidic solution was investigated by the use of XANES and EXAFS. It was found that each Mo atom in the dimer has two terminal oxygens and Mo–O–Mo bond angle is ca. 125°.
Synthetic Peptide Lipids Having Axial Chirality. Preparation and Aggregate Morphology
Authors: Murakami Yukito , Kikuchi Jun-ichi , Lee Jeng-Jong , Uchimura Katsuya , Hioki Chieko
Published: July 2006

The (R)-(+)- and (S)-(−)-3,3′-dinitro-2,2′-dibenzoyl moieties were used as axial chirality components, and peptide lipids were prepared by introducing either of them into the single chain portion adjacent to the alanyl residue. Their aggregate morphology was examined in aqueous media by various physical methods.
Activation of Superoxide. Facile Oxidation of Sulfoxides into Sulfones with a Peroxysulfur Intermediate Generated in situ from 2-Nitrobenzenesulfonyl Chloride and Superoxide
Authors: Kim Yong Hae , Lee Hyeon Kyu
Published: July 2006

Various sulfoxides, such as dialkyl, alkyl-aryl, and diaryl sulfoxides, were readily oxidized into the corresponding sulfones, in excellent yields under mild conditions, by 2-nitrobenzene peroxysulfur intermediate yenerated in situ from 2-nitrobenzenesulfonyl chloride and potassium superoxide at −30 °C, in dry acetonitrile. Chemoselective oxidation of sulfoxides which contain both double bond and sulfinyl moiety to the sulfones, was observed under the same conditions.
Inhibition of Dealumination of ZSM-5 Zeolites by Alkali Metals
Authors: Suzuki Kunio , Sano Tsuneji , Shoji Hiroshi , Murakami Tohru , Ikai Shigeru , Shin Shigemitsu , Hagiwara Hiroyuki , Takaya Haruo
Published: July 2006

Effect of alkali metal cations on dealumination of a framework of ZSM-5 zeolite with water was investigated by using 27Al MASNMR and FT-IR. It was found that under the steaming conditions of 600 °C for 13.5 h, dealumination of the zeolite is quantitatively controlled by alkali metal cations introduced by an ion-exchange method, leaving framework aluminium in the concentrations nearly equal to those of the metal cations.
Formation of C4-Hydrocarbons by Oxidative Methylation of Propylene with Methane over Various Metal Oxide Catalysts
Authors: Sodesawa Toshiaki , Matsubara Masato , Satoh Satoshi , Nozaki Fumio
Published: July 2006

Various metal oxides were studied as a catalyst for formation of C4-hydrocarbons by the reaction between methane and propylene in the presence of oxygen. La2O3 catalysts showed high activities for the C4 formation. In the case of La2O3 catalyst modified with 3 wt% Na2O, a much higher yield of C4 (10.1%) was obtained.
Preparation of Efficient Carbon Monoxide Adsorbent from Iron(II) Chloride, Copper(II) Chloride, and Active Carbon
Authors: Komiyama Makoto , Ando Hiroaki , Wada Keiichiro , Hirai Hidefumi
Published: July 2006

An adsorbent for carbon monoxide is prepared from 30.0 mmol of copper(II) chloride, 30.0 mmol of iron(II) chloride, and 20.0 g of active carbon. The adsorbing capacity (28.4 mmol) of the adsorbent is 2.1 times as large as the sum (13.7 mmol) of the capacity (11.8 mmol) of the active carbon-supported copper(II) chloride and that (1.9 mmol) of the active carbon-supported iron(II) chloride.
Reactions of Allenylic Tin Reagents to N-Alkoxycarbonyl-isoquinolinium and -quinolinium Salts. Effective Introduction of 2-Alkynylic Groups to Isoquinoline and Quinoline Systems
Authors: Yamaguchi Ryohei , Moriyasu Masataka , Takase Ichiro , Kawanisi Mituyosi , Kozima Sinpei
Published: July 2006

Reactions of allenylic tin reagents with isoquinoline in the presence of chloroformate esters as acylating agents give 2-alkoxycarbonyl-1-(2-alkynyl)-1,2-dihydroisoquinolines in good to excellent yields. Similarly, the reactions with quinoline give 1-alkoxycarbonyl-2-(2-alkynyl)-1,2-dihydroquinolines exclusively.
Asymmetric Synthesis of 2-Amino Alcohol Derivatives from (S)-α-Amino Aldehydes via Chiral Acetal Templates
Authors: Kano Shinzo , Yokomatsu Tsutomu , Iwasawa Haruo , Shibuya Shiroshi
Published: July 2006

Titanium tetrachloride mediated addition of allyltrimethylsilane to chiral acetals derived from (S)-α-amino aldehydes and (+)-(2S,4S)-pentane-2,4-diol gave the anti-2-amino alcohol derivatives with considerably high diastereoselectivity. On the other hand, the same reaction by the use of acetals obtained from (−)-(2R,4R)-pentane-2,4-diol gave the products of opposite stereochemistry series as major products.
Diene Complexes of Pentamethylcyclopentadienyltitanium Chloride. Synthesis and First X-Ray Structure of Titanium–Diene Complexes
Authors: Chen Jie , Kai Yasushi , Kasai Nobutami , Yamamoto Hitoshi , Yasuda Hajime , Nakamura Akira
Published: July 2006

A series of titanium–diene complexes has been prepared by the reaction with TiCl3(C5Me5) and (2-butene-1,4-diyl)magnesium derivatives and the first X-ray structure analysis of titanium–diene complex, TiCl(C5Me5)(s-cis-butadiene), revealed novel prone(endo) geometry for diene coordination.
Syntheses and Characteristics of Near-Infrared Absorbing Metal Complex Dyes with Indoaniline-type Ligands
Authors: Kubo Yuji , Sasaki Kyoko , Yoshida Katsuhira
Published: July 2006

New metal complex dyes with N,O-bidentate indoaniline type ligands have been prepared, which absorb near-infrared light at 745–776 nm in EtOH. Some of these complex dye media have excellent characteristics for the practical use as diode-laser optical storage.
Efficient Route to γ,δ-Unsaturated Carbonyl Compounds from Allyl Sulfides and α-Diazocarbonyls Using a Rhodium Catalyst
Authors: Takano Seiichi , Tomita Shun’ichi , Takahashi Michiyasu , Ogasawara Kunio
Published: July 2006

Functionalized γ,δ-unsaturated carbonyl compounds are efficiently prepared from allyl sulfides and α-diazo carbonyl compounds by catalysis of rhodium (II) acetate.
Novel Ring Contraction of 1,2-Diazocine System. Hydrolysis of 7-Substituted 4-Acetoxy- and 4-Phthalimido-3,8-diphenyl-1,2-diazocines Leading to the Formation of Pyrazoles
Authors: Yogi Seiichi , Hokama Kozo , Tsuge Otohiko
Published: July 2006

A novel ring contraction of 1,2-diazocine system to pyrazoles via [5.5]bicyclic intermediates has been demonstrated by hydrolysis of 7-substituted 4-acetoxy- and 4-phthalimido-3,8-diphenyl-1,2-diazocines.
Equilibration of CO2 with CO and O2 in Electric Discharge
Authors: Tanaka Kazunori , Gao Da Wei
Published: July 2006

Equilibration of CO2 decomposition, 2CO2\ightleftharpoons2CO+O2, has been observed in electric discharge over a range of total pressures 10 to 50 Torr. The equilibrium conversion of CO2 to CO decreased with increasing total pressure.
Cubic Azaparacyclophane
Authors: Murakami Yukito , Kikuchi Jun-ichi , Hirayama Takayuki
Published: July 2006

A cubic macrocycle, each face being constructed with the 2,11,20,29-tetraaza[3.3.3.3]paracyclophane ring, was prepared as a novel host molecule which provides a relatively rigid and hydrophobic three-dimensional cavity, and its guest-binding behavior was examined in acidic aqueous media.
Development of Long-life Dealuminated Mordenite for Methanol Conversion to Hydrocarbons
Authors: Sawa Masahiko , Niwa Miki , Murakami Yuichi
Published: July 2006

A long-life catalyst for the methanol conversion was obtained by the dealumination where the temperature and concentration of HCl solution were precisely controlled.
Et3B Induced Radical Addition of Thiols to Acetylenes
Authors: Ichinose Yoshifumi , Wakamatsu Kuni , Nozaki Kyoko , Birbaum Jean-Luc , Oshima Koichiro , Utimoto Kiitiro
Published: July 2006

Thiols added easily to acetylenic compounds in the presence of Et3B to give alkenyl sulfides in good yields. The reaction of acetylenes with 3-methyl-2-buten-1-thio1 gave dihydro-thiophene derivatives in one pot.
Dehydrogenation of Cyclohexane on Alumina-Supported Rhodium Catalysts. Effect of Oxidation-Reduction Treatment on the Catalytic Activity
Authors: Maeda Akira , Kunimori Kimio , Uchijima Toshio
Published: July 2006

The cyclohexane dehydrogenation and H2 chemisorption on Rh/Al2O3 catalysts have been studied as a function of reduction temperature (at 373–773 K), preceded by O2 treatment at 673 K. The catalytic activity increased by a factor of 5 after high-temperature reduction at 773 K, while there was almost no change in the H2 chemisorption capacity with varying the reduction temperature.
Synthesis and Properties of Methano-Bridged Thia[15]-, Thia[17]-, and Thia[19]annulenes
Authors: Kuroda Shigeyasu , Nozawa Yoshihiko , Yoneyama Yoshiharu , Fujita Satoshi , Yanagihara Kazuhiro , Ojima Juro
Published: July 2006

Title annulenes have been synthesized through a double Wittig reaction between the vinylogous dicarbaldehydes of 1,6-diformylcycloheptatriene and bis[(triphenylphosphonio)methyl]sulfide dibromide, and their 1H NMR spectra were examined proving that the thia[17]- and - [19]annulenes sustain ring current, while the thia-[15]annulene does not.
The 1,1′-Trimethylenebis(pyridinyl) Diradical and Its Photosensitive Cyclomers
Authors: Muramatsu Takashi , Hanaya Kaoru , Onodera Shinji , Ikegami Yusaku
Published: July 2006

Reduction of 1,1′-trimethylenebis(pyridinium) dibromide with sodium amalgam produces the cyclomers of 1,1′-trimethylene-bis(pyridinyl) diradical. Meso and dl forms of the cyclomers are convertible to each other. Two conformations of the diradical are observed in the triplet ESR spectrum at 77 K.
The Trityl Cation Mediated Michael Reaction of Ethylthioketene Dithioacetals with Silyl Enol Ethers
Authors: Hashimoto Yukihiko , Sugumi Hiroyuki , Okauchi Tatsuo , Mukaiyama Teruaki
Published: July 2006

In the presence of trityl tetrafluoroborate, 2-(2-ethylthioalkylidene)-1,3-dithiolanes smoothly react with silyl enol ethers at low temperature to afford the corresponding oxoketene dithioacetal adducts in good yields. This reaction is formally equivalent to the Michael reaction between ketone enolates and α,β-unsaturated esters.
Electrochemical Synthesis of Poly(p-phenylene xylylidene), a New Electrically Conducting Polymer
Authors: Tateishi Masahiro , Nishihara Hiroshi , Aramaki Kunitsugu
Published: July 2006

Electroreduction of α,α,α,α′,α′,α′-hexachloro-p-xylene at a copper electrode in n-Bu4NBF4-propylene carbonate gave a free-standing film of poly(p-phenylene xylylidene), PPX, a new conducting polymer with phenylenic and acetylenic backbones. The PPX film exhibited a conductivity of 70 S cm−1 on doping with SO3.
Crystal Structure and Electrical Properties of (BEDT-TTF)3Br2(H2O)2
Authors: Urayama Hatsumi , Saito Gunzi , Kawamoto Atsushi , Tanaka Jiro
Published: July 2006

A small anion, Br−, forms a metallic 3:2 BEDT-TTF salt with an inclusion of water. In the crystal two water molecules and two bromide anions form a cluster which behaves as a dianion group. The measurement of the electric resistivity indicates that this material has a metal-insulator transition at 185 K.
Intramolecular Cyclization with Nitrenium Ions Generated from N-Chloro-N-methoxyamides in Neutral Conditions
Authors: Kikugawa Yasuo , Shimada Masahiro
Published: July 2006

Intramolecular aromatic substitution by a N-chloro-N-methoxyamide group to a suitably situated aromatic ring in the molecule is performed by using anhydrous zinc acetate and nitromethane as solvent to give nitrogen heterocycles in good yield.
Synthesis of Oligoribonucleotides by Using 2′-O-(1-Methyl-1-methoxy)ethyl Nucleosides
Authors: Takaku Hiroshi , Imai Kazuaki , Nakayama Koukichi
Published: July 2006

3′,5′-O-Tetraisopropyldisiloxanylnucleosides smoothly react with 2-methoxypropene to give 2′-O-(1-methyl-1-methoxy)ethyl nucleosides in high yields without formation of diastereoisomers. These nucleosides were used as intermediates for oligonucleotide synthesis by the phosphotriester method. The (1-methyl-1-methoxy)ethyl group was removed rapidly from oligonucleotides by acid treatment.
Reversible Binding of Dioxygen by an Iron Complex of 3,5-Di-t-butylcatechol
Authors: Funabiki Takuzo , Konishi Toru , Tada Shinichi , Yoshida Satohiro
Published: July 2006

Reversible electronic and ESR spectral changes have been observed by oxygenation and deaeration of [Fe(DTBC)3]3− (DTBCH2:3,5-di-t-butylcatechol) in organic solvents, suggesting formation of a ternary catechol–iron–oxygen complex. The reaction of [Fe(DTBC)3]3− with oxygen yielded intra- and extradiol oxygenation products, whose ratio was dependent on solvent.
Methylvinyl Ketone Formation over Synthetic Chrysotile
Authors: Suzuki Eiichi , Idemura Satoshi , Ono Yoshio
Published: July 2006

Selective formation of methylvinyl ketone (MVK) was attained over chrysotile, Mg3(OH)4Si2O5, through aldol condensation reaction between acetone and formaldehyde, the selectivity being 98% on both acetone and formaldehyde bases. Synthetic Co2+-substituted chrysotile, CoxMg3-x(OH)4Si2O5 (x= 0.15 or 0.9), catalyzed the reaction between acetone and methanol to give MVK and methylethyl ketone (MEK) with 75% selectivity on acetone basis.
An Enantioselective Synthesis of a Macrolide from the Polyketide Lactone Derived from Oleandomycin
Authors: Tatsuta Kuniaki , Kobayashi Yoshiyuki , Akimoto Kohji , Kinoshita Mitsuhiro
Published: July 2006

The polyketide lactone, 8-methyl-3,5,11-trioxo-oleandolide, which is obtained from a new aglycone of oleandomycin by ruthenium tetraoxide oxidation, is stereoselectively reduced by zinc borohydride in the presence of magnesium bromide to give a macrolide, (5R,8R,9R)-9-dihydro-8-methyl-epi-oleandolide in a good yield.
Crystal Structure of Tetrabutylammonium μ-Oxalato-bis(oxodiperoxotungstate)(2-), [(n-C4H9)4N]2[WO(O2)2(C2O4)WO(O2)2]
Authors: Hashimoto Masato , Ozeki Tomoji , Ichida Hikaru , Sasaki Yukiyoshi , Matsumoto Kazuko , Kudo Tetsuichi
Published: July 2006

A structure of a novel complex anion [WO(O2)2(C2O4)WO(O2)2]2− which was obtained from the reaction of H2O2 with WC was determined by an X-ray diffraction method. The final R-value was 0.084. This is the first example of the anion containing both C2O4 and O2 groups isolated from this reaction. In this anion one C2O42− coordinates to two W atoms forming two chelate rings, and this type of coordination is no precedent for tungsten compounds.
Study of Electrochromic Reactions of WO3/H+ System by In Situ Electrogravimetry
Authors: Masuda Hideki , Baba Nobuyoshi
Published: July 2006

The reactions of electrochromic display devices were studied in situ by measuring the small weight change of the electrode with the liquid phase quartz crystal microbalance. Time response of the weight change during the bleaching and coloring process was in good accordance with those of charge and optical density. Based on the results of weight measurements, the mechanism of the coloring reaction in WO3/H+ was discussed.
An Oxygen Sensitive α-Fe2O3–Au Diode
Authors: Kobayashi Kenkichiro , Takano Minoru , Okamoto Shoichi
Published: July 2006

The rectification characteristics of the α-Fe2O3–Au diode are significantly damaged at room temperature by applying the large reverse bias to the diode in Ar. The damage is recovered as the ambient O2-partial pressure is increased. The diode can detect O2 at more than 1000 ppm.
Regioselective Para Chlorination of Alkoxybenzenes by Use of Alumina Supported Copper(II) Chloride
Authors: Kodomari Mitsuo , Takahashi Shin , Yoshitomi Suehiko
Published: July 2006

Alkoxybenzenes were highly regioselectively chlorinated by use of copper(II) chloride supported on neutral alumina in chlorobenzene to give p-alkoxychlorobenzenes in high yield. The p/o ratios were more than 30.
Novel Deuteration via Acetylene Bond Migration
Authors: Takano Seiichi , Sekiguchi Yoshinori , Shimazaki Youichi , Takahashi Michiyasu , Ogasawara Kunio
Published: July 2006

Optically active terminal-β,γ-acetylenic alcohol rearranges to β-trideuteriomethyl-α,β-acetylenic alcohol, an useful chiral building block for the synthesis of a variety of natural products, on exposure to potassium t-butoxide in dimethyl sulfoxide-d6.
Direct Formations of o-Tropoquinone Bisacetals from 2,3- and 2,7-Dimethoxytropones and p-Tropoquinone Bisacetals from 2-Bromo-7-methoxytropone by the Anodic Oxidation
Authors: Mori Akira , Kubota Tadahiko , Kasai Seishi , Takeshita Hitoshi
Published: July 2006

Anodic oxidation of 2,7- and 2,3-dimethoxytropones gave the correspondong isomeric o-tropoquinone bisacetals, 2,2,7,7-tetramethoxycyclohepta-3,5-dienone and 2,2,3,3-tetramethoxycyclohepta-4,6-dienone in good yields. By H2SO4-treatment in AcOH–Ac2O, former afforded 4-acetoxy-2,7-dimethoxytropone, 2,5-diacetoxy-7-methoxytropone and 4,5-diacetoxy-3-methoxytropone, latter did no such product. Similar oxidation of 2-bromo-7-methoxytropone gave alternative p-tropoquinone bisacetal derivatives.
Specific Rejection of Glycophorin-Reconstituted Liposomes by Human Phagocytes
Authors: Goto Mitsuaki , Arakawa Motoomi , Sato Toshinori , Kondo Hiroki , Sunamoto Junzo
Published: July 2006

The interaction between human phagocytes and glycophorin-reconstituted liposomes was investigated from the view point of internalization efficiency of the liposome by phagocytes. The glycophorin-reconstituted liposome was found to be rejected by phagocytes in the internalization. When the sialic acid residues of glycophorin were partly eliminated by neuraminidase, however, the cell uptake increased about two times.
Reduction of Hydroperoxythymines with Glutathione and Glutathione Peroxidase
Authors: Itahara Toshio
Published: July 2006

Glutathione peroxidase exerted acceleration effect on reduction of cis-6-hydroperoxy-5-hydroxy-5,6-dihydrothymine with glutathione, whereas it exerted little effect on reduction of trans-5-chloro-6-hydroperoxy-5,6-dihydrothymine with glutathione.
A Novel Method of Annulation through α,β-Epoxy Sulfoxides with the Aid of Intramolecular Radical Cyclization
Authors: Satoh Tsuyoshi , Itoh Masayuki , Yamakawa Koji
Published: July 2006

A novel method of annulation was realized from ketones through α,β-epoxy sulfoxides with the aid of endo-type intramolecular radical cyclization. In these reactions 1-chloroalkyl phenyl sulfoxides having phenylseleno group on an end of the alkyl group acted as synthons of the annulation.
Charge Shift along the Metal–Metal Bond in Molybdenum-Tungsten Mixed-metal Complexes, [M3(μ3-O)2(μ-CH3COO)6(H2O)3]2+ (M3 = Mo2W and MoW2) and [MoW(O)2 (μ-O)2(μ-N,N′-edta)]2−
Authors: Wang Bateer , Sasaki Yoichi , Ikari Shinji , Kimura Keisaku , Ito Tasuku
Published: July 2006

An XPS study for series of dinuclear and trinuclear complexes of Mo and W including titled mixed-metal complexes and their parent homo-metal analogs shows that, in the mixed metal complexes, oxidation states of Mo and W shift to some extent toward lower and higher states than the formal ones, respectively. This is a result of charge shift along the metal–metal bond in the mixed metal clusters.
The Chemiluminescence of Luminol/H2O2 with the Ferriprotoporphyrin IX/N-Vinylpyrrolidone Copolymer as a Catalyst in the Neutral pH Solution
Authors: Karatani Hajime
Published: July 2006

The copolymer of ferriprotoporphyrin IX and N-vinylpyrrolidone, having peroxidase activity, was prepared by radical polymerization for application as a catalyst of the titled chemiluminescence. This copolymer acted as an efficient catalyst in the production of light emission sufficient to be detected in a neutral aqueous system.
A Facile Method for the Fluorine Substitution of Phenylthio Group via Sulfonium Salts Using Cesium Fluoride
Authors: Ichikawa Junji , Sugimoto Ken-ichi , Sonoda Takaaki , Kobayashi Hiroshi
Published: July 2006

Monofluorinated compounds are easily prepared in good yields by treating phenyl sulfides with methyl fluorosulfonate and cesium fluoride in refluxing dichloromethane, successively. This reaction proceeds under so mild conditions as not to affect the coexisting bromine substituent.
CO Sensitive Pt/SnO2 Diode Type Gas Sensor
Authors: Matsushima Shigenori , Miura Norio , Yamazoe Noboru
Published: July 2006

A Pt(sputtered film)/SnO2(disc) diode was found to respond to small amounts of CO in air at lower temperatures below 100 °C, while no response was observed for CH4 and C3H8. The CO sensitivity of the diode gave a maximum at 90 °C, which was about three times as high as the sensitivity to H2. The 50% response time of the sensor to 1000 ppm CO was about 1 min.
Diastereoselective Reduction of α-Keto Amides Having trans-2,5-Disubstituted Pyrrolidines as Chiral Auxiliaries
Authors: Kawanami Yasuhiro , Fujita Izumi , Taniguchi Yoshiyuki , Katsuki Tsutomu , Yamaguchi Masaru
Published: July 2006

The reduction of α-keto amides derived from (2R,5R)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine with LiBEt3H or KBEt3H proceeded with high diastereoselectivity (up to 99% ds) to afford the corresponding α-hydroxy amides in good yield. The effect of added crown ethers or LiBr was also examined.
Synthesis and Crystal Structures of Trinuclear Molybdenum Chloro Sulfido Clusters Coordinated with Triethylphosphine and Methanol
Authors: Saito Taro , Yamamoto Naohiro , Yamagata Tsuneaki , Imoto Hideo
Published: July 2006

Two triethylphosphine complexes of trinuclear molybdenum chlorosulfido clusters have been synthesized. Determination of the crystal structures have shown that they can be formulated as [Mo3(μ3-S)(μ-S)3Cl4(PEt3)n(MeOH)5−n] (n = 3, 4).
Synthesis and Characterization of 5-Deoxy-3-O-methyl-5-C-[(R) - and (S)-phenylphosphinothioyl]-α- and β-d-xylopyranoses. The First Sugar Analogue Having a Phosphinothioyl Group in the Hemiacetal Ring
Authors: Yamamoto Hiroshi , Hanaya Tadashi , Shigetoh Nobuyuki , Kawamoto Heizan , Inokawa Saburo
Published: July 2006

Treatment of 5-deoxy-5-iodo-1,2-O-isopropylidene-β-O-methyl-α-d-xylofuranose with ethyl phenylphosphinothioate in the presence of sodium hydride, followed by the reduction with sodium dihydrobis(2-methoxyethoxy)aluminate, and then with 0.5 M HCl–EtOH gave the title compounds, which were characterized as the 1,2,4-O-triacetates.
Regeneration of NADH and Hydrogenation of Ketones to Alcohols with the Combination of Hydrogenase and Alcohol Dehydrogenase
Authors: Otsuka Keiichi , Aono Shigetoshi , Okura Ichiro
Published: July 2006

The regeneration of nicotinamide-adenine dinucleotide (reduced form, NADH) by the reduction of NAD with hydrogen gas was carried out in the presence of the hydrogenase from Alcaligenes eutrophus, and ketone hydrogenation was tried by the combination of the above system and alcohol dehydrogenase (ALDH). The ketones such as 2-butanone, 2-pentanone, and 2-hexanone were easily hydrogenated by hydrogen gas. After 65 h, the turnover number of NAD was 64 for 2-butanone showing a recurrence of NAD by hydrogen gas.
Catalytic Gasification of Coals Using Rare Earth Compounds
Authors: Suzuki Toshimitsu , Nakajima Seiji , Watanabe Yoshihisa
Published: July 2006

Catalytic gasification of coal with CO2 or steam using rare earth compounds was investigated. Nitrates of lanthanum, cerium and samarium were found to be effective catalysts for the coal gasification.
Syn-epoxidation of Chiral (Z)-2-Methyl-3-alkenal Acetal via Stereo-selective Bromohydrin Formation
Authors: Honda Yutaka , Kataoka Yohko , Unno Masahiko , Tsuchihashi Gen-ichi
Published: July 2006

Synthesis of syn-epoxide from chiral (Z)-2-methyl-3-alkenal acetal via stereoselective bromohydrin formation by using a reagent prepared from N-bromosuccinimide (NBS) and dimethyl sulfoxide (DMSO) under irradiation, and regioselective C–C bond formation were described.