bluuebunny/crossref_metadata_2025 huggingface dataset:
AN ALKOXY RADICAL REARRANGEMENT OF PHOTOCYCLOADDUCT OF 4-HYDROXYCOUMARIN AND DIMETHYLBUT-2-ENE TO FUROCOUMARIN AND FUROBENZO-γ-pyrone. Coumarin–BENZO-γ-PYRONE TRANSFORMATION
Authors: Suginome Hiroshi , Liu Chi Fu , Furusaki Akio
Published: July 2006

The alkoxy radical generated from a fused cyclobutanol obtained by the photocycloaddition of 4-hydroxycoumarin and dimethylbut-2-ene rearranges to a furocoumarin and a furo-benzo-γ-pyrone. The results afford further insight regarding the mechanism of the formation of the furocoumarins.
PREPARATION OF THE P-COORDINATED GROUP VIB METAL PENTACARBONYL COMPLEXES OF DIARYLDIPHOSPHENES
Authors: Yoshifuji Masaaki , Hashida Takashi , Shibayama Katsuhiro , Inamoto Naoki
Published: July 2006

The Group VIB metal(O) carbonyl complexes of diaryldiphosphenes at the phosphorus atom were prepared by two different methods and characterized : A novel migration reaction of the metal carbonyl groups is described.
USE OF ALCOHOL AS AN EFFICIENT REDUCTANT IN DYE SENSITIZED REDUCTION OF METHYL VIOLOGEN
Authors: Wakisaka Akihiro , Misawa Hiroaki , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

2-propanol acted as an efficient reductant in sodium anthraquinone-2-sulfonate sensitized reduction of methyl viologen in aqueous 2-propanol.
BIS(η5-INDENYL)IRON(II)-CATALYZED PHOTOREDUCTION OF METHYLVIOLOGEN
Authors: Akiyama Takeo , Kondo Akira , Omata Makoto , Kajitani Masatsugu , Sugimori Akira
Published: July 2006

Bis(η5-indenyl)iron(II) catalyzes the photoreduction of methylviologen in methanol solutions under irradiation with near ultraviolet light. The quantum yields for the formation of the cation radical of methylviologen (MV\overset+·) with 400–480 nm light are 0.04–0.05. But under light of wavelength shorter than 400 nm bis(η5-indenyl)iron(II) acts as a triplet quencher for the excited methylviologen in the triplet state and lowers the yield of MV\overset+·. A reaction mechanism in which the excited singlet state of bis(η5-indenyl)iron(II) is involved is proposed for the sensitized reduction of methylviologen.
SUPPRESSION OF CO HYDROGENATION ACTIVITY OF Pt/TiO2 CATALYST BY THE SMSI TREATMENT AND ITS RECOVERY DURING THE REACTION
Authors: Kunimori Kimio , Matsui Shingo , Uchijima Toshio
Published: July 2006

The catalytic activity of CO + H2 reaction over a Pt/TiO2 catalyst decreased significantly after high-temperature reduction at 773 K (the SMSI treatment), but almost recovered during the reaction due to the reverse effect of O atoms (or water molecules) formed.
A NEW, GENERAL, AND STEREOSELECTIVE SYNTHESIS OF LONG CHAIN TETRAENOIC ACIDS EXAMPLIFIED BY β-PARINARIC ACID
Authors: Hayashi Toshio , Oishi Takeshi
Published: July 2006

All trans-9,11,13,15-octadecatetraenoic acid was first synthesized in a stereoselective manner, using pentadienyl and allyl dithiocarbamates as the starting materials. This synthesis confirmed that β-parinaric acid has all trans configurations about the four double bonds.
THE CRYSTAL STRUCTURE OF A NEW CHARGE-TRANSFER SALT OF HEXAMETHYLENETETRATELLURAFULVALENE, (HMTTeF)4(PF6)2
Authors: Kikuchi Koichi , Yakushi Kyuya , Kuroda Haruo , Ikemoto Isao , Kobayashi Keiji , Honda Masako , Katayama Chuji , Tanaka Jiro
Published: July 2006

The single crystal of (HMTTeF)4(PF6)2 was first prepared by the electrochemical method. The X-ray crystal structure analysis revealed that among four HMTTeF molecules in the unit cell, three are stacked to form trimeric molecular column along the a-axis and the remaining one is located between the HMTTeF columns, having very short intermolecular Te–Te distances with the HMTTeF column.
PREPARATION OF STABLE PHOSPHIRANES FROM PHOSPHIDE AND EPOXIDE ASSISTED BY SILICON
Authors: Yoshifuji Masaaki , Toyota Kozo , Inamoto Naoki
Published: July 2006

Sterically protected E- and Z-1-(2,4,6-tri-t-butylphenyl)-2-phenylphosphiranes were prepared from the corresponding silylphosphide and styrene oxide: the reaction might involve unusual rearrangement and elimination of a silyl group.
A FACILE AND STEREOSELECTIVE SYNTHESIS OF α-METHYLENE-γ-BUTYROLACTONE BY MEANS OF CHROMIUM(II) REAGENT
Authors: Okuda Yasuhiro , Nakatsukasa Shigeki , Oshima Koichiro , Nozaki Hitosi
Published: July 2006

Treatment of ethyl α-(bromomethyl)acrylate with Cr(II) reagent derived from CrCl3 and LiAlH4 produces allylic chromium species which add to aldehydes efficiently to give α-methylene-γ-butyrolactones stereoselectively.
5-PHENYLTRICYCLO[7.4.1.03,6]- AND 3-PHENYLTRICYCLO[7.4.1.02,5]TETRADECAHEXAENYL ANION. NOVEL 14π-ELECTRON SYSTEMS
Authors: Kawase Takeshi , Iyoda Masahiko , Oda Masaji
Published: July 2006

While 5-phenyltricyclo[7.4.1.03,6]tetradecahexaenyl anion, an anionic member of [4n]annuleno[4n]annulene, is moderately diatropic, 3-phenyltricyclo[7.4.1.02,5]tetradecahexaenyl anion appears atropic.
REDUCTION OF NITRO ALKENES BY A MODEL OF NAD(P)H
Authors: Nakamura Kaoru , Fujii Masayuki , Oka Shinzaburo , Ohno Atsuyoshi
Published: July 2006

Carbon–carbon double bonds in α,β-unsaturated nitro compounds are reduced smoothly into the corresponding nitro alkanes by a model of NAD(P)H in benzene in the presence of silica gel. Other functional groups are inert under the reaction conditions.
A HIGHLY EFFICIENT SYNTHESIS OF γ- AND δ-LACTONES BY OXIDATIVE CYCLIZATIGN
Authors: Charaborty T K , Chandrasekaran S
Published: July 2006

Treatment of tertiary γ- and δ-hydroxyolefins with pentavalent chromium reagent, (BipyH2)CrOCl5, give good yields of γ- and δ-lactones by oxidative cyclization, with loss of one carbon. Pyridinium chlorochromate (PCC) also effects this transformation to γ-lactones in reasonable yields.
RELATION BETWEEN THE GASIFICATION RATE AND THE AMOUNT OF OXYGEN ON CARBON SURFACE DURING THE GASIFICATION OF A CARBON SUPPORTING SEVERAL ALKALINE METAL SALTS
Authors: Hashimoto Kenji , Miura Kouichi , Xu Ji-Jun , Watanabe Akira
Published: July 2006

The oxygen trapped by metal on the carbon surface was measured in terms of the so-called flash desorption method by use of a Curie-point pyrolyzer. The steam gasification rate of the carbon supporting several alkaline metal salts was found to be proportional to the amount of the oxygen measured by the method. Furthermore, the moles of the oxygen trapped by metal on the carbon surface were found to be equal to the moles of metal supported.
A SIMPLE AND EFFICIENT SYNTHESIS OF KEY SYNTHETIC INTERMEDIATES OF 4-DEMETHOXYANTHRACYCLINONES, (±)- AND (R)-(−)-7-DEOXY-4-DEMETHOXYDAUNOMYCINONE
Authors: Suzuki Michiyo , Matsumoto Teruyo , Abe Rumiko , Kimura Yoshikazu , Terashima Shiro
Published: July 2006

(±)-2,5,12-Trihydroxy-1,2,3,4-tetrahydronaphthacene-6,11-dione-2-carboxylic acid was found to readily afford the racemic title compound by successive treatments with N,N′-carbonyldiimidazole and methylmagnesium bromide in the presence of trimethylsilyl triflate. The same reaction scheme could also furnish the optically pure title compound from the (R)-carboxylic acid produced by the optical resolution.
LITHIATION OF AN IMIDAZOLE NUCLEOSIDE AT THE C-5 POSITION. SYNTHESIS OF 3-DEAZAGUANOSINE FROM URIDINE
Authors: Tanaka Hiromichi , Hirayama Masashi , Matsuda Akira , Miyasaka Tadashi , Ueda Tohru
Published: July 2006

3-Deazaguanosine, an antiviral nucleoside, was synthesized from uridine via lithiation of a C-2 protected imidazole nucleoside, which has been devised as a method for introducing various functionalities to the C-5 position. This furnished the first successful example of the conversion of a naturally occurring nucleoside to a deazapurine nucleoside.
SYNTHESIS OF 4-SUBSTITUTED 1,1-DI-t-BUTYLBENZOSILACYCLOBUTENES
Authors: Kang Kyung-Tae , Song Hwan-Young , Seo Hee-Chan
Published: July 2006

Bromination of 1,1-di-t-butyl-2,3-benzo-1-silacyclo-2-butene with N-bromosuccinimide gave its 4-bromo derivative. Metallation with n-Bu2CuLi followed by alkylation or acylation gave the corresponding 4-alkyl or acyl derivatives. Replacement of the bromine atom with alkoxyl group was achieved by treatment with alcohol in the presence of AgBF4.
SUPPRESSION OF THE CONVERSION OF 3-t-BUTYL-1-METHYL-1-NITROSOTHIOUREA TO 3-t-BUTYL-1-METHYLUREA BY β-CYCLODEXTRIN UNDER ACIDIC CONDITIONS
Authors: Isobe Masayoshi
Published: July 2006

The denitrosation of 3-t-butyl-1-methyl-1-nitrosothiourea(1) was retarded by β-, and γ-cyclodextrins(CDs) at pH 4.70. Decomposition of 1 in the presence of β-CD produced selectively 3-t-butyl-1-methylthiourea(1a), which was remarkably different from the product ratio in the absence of β-CD. These results may be caused by both the protective and the microsolvent effect of β-CD.
A FACILE SYNTHESIS OF 1,3-DICARBONYL COMPOUNDS FROM 1-ALKYNE AND ACID ANHYDRIDE PROMOTED BY DICHLORO-BIS(TRIFLUOROMETHANESULFONATO)TITANIUM(IV)
Authors: Tanabe Yoo , Mukaiyama Teruaki
Published: July 2006

1,3-Dicarbonyl compounds are prepared in high yields by acylation of 1-alkyne derivatives with acid anhydride in the presence of dichloro-bis(trifluoromethanesulfonato)titanium(IV), followed by aqueous work up.
THE SYNTHESIS OF BORON NITRIDE AND BORON CARBIDE BY PYROLYSIS OF BORIC ACID/1,2,3-PROPANETRIOL CONDENSATION PRODUCT
Authors: Wada Hiroaki , Ito Shuichi , Kuroda Kazuyuki , Kato Chuzo
Published: July 2006

Both boron nitride and boron carbide were synthesized by the pyrolysis of the boric acid/1,2,3-propanetriol condensation product above 1300 °C in N2, whereas the thermal treatment in an Ar flow yielded boron carbide.
A NOVEL SYNTHESIS OF (E,E)-1,4-DIARYL-1,3-BUTADIENES BY THE RUTHENIUM(II) CATALYZED REACTION OF (E)-2-ARYLETHENESULFONYL CHLORIDES WITH VINYLARENES
Authors: Kamigata Nobumasa , Ozaki Jun-ichi , Kobayashi Michio
Published: July 2006

Symmetrical and unsymmetrical (E,E)-1,4-diaryl-1,3-butadienes can be prepared in high yields from (E)-2-arylethenesulfonyl chlorides by treating with vinylarenes in the presence of ruthenium(II) phosphine complex in benzene.
NEW STRATEGY FOR CHIRAL ALKALOID SYNTHESIS COMMENCING WITH A CARBOHYDRATE. SIMPLE SYNTHESIS OF (−)-ALLO-YOHIMBANE FROM LEVOGLUCOSENONE
Authors: Isobe Minoru , Fukami Naoki , Goto Toshio
Published: July 2006

An optically active allo-yohimbane was synthesized in 12 steps from levoglucosenone. The key steps are Diels–Alder cycloaddition for the E-ring construction followed by eliminative Wolff–Kishner reduction and selective double cyclization in the D- and C-ring formation.
Cu AND Cu-BASED AMORPHOUS ALLOY ELECTRODES FOR ANODIC FORMALDEHYDE ELECTRO-OXIDATION
Authors: Machida Ken-ichi , Enyo Michio
Published: July 2006

The electrodes of Cu and Cu-based amorphous alloys, a-Cu35Ti65 and a-Cu33Zr67, were very active for the HCHO electro-oxidation in alkaline solutions. The oxidation started at electrode potentials as low as 0.1 V (RHE) and the HF-treated amorphous alloys exhibited high current densities around 40 mA cm−2 (app.) at 0.2 V.
OSCILLATIONS OF FLUORESCENCE FROM IRRADIATED ERIOCHROME CYANINE R AND ERIOCHROME BLACK T IN AQUEOUS SOLUTION
Authors: Yoshikawa Kenichi , Mori Yoshihito , Terada Hiroshi , Kina Kenyu
Published: July 2006

Rhythmic ocillations in fluorescence intensity were observed from irradiated organic f1uorochrmoes, eriochrome cyanine R and eriochrome black T, in aqueous solution.
NUCLEOPHILIC ADDITION OF PRIMARY ALCOHOLS TO N-METHYLACRIDINIUM CATION
Authors: Kano Koji , Zhou Bin , Hashimoto Shizunobu
Published: July 2006

N-Methylacridinium chloride (MA) reacted with primary alcohols to yield corresponding N-methyl-9-alkoxyacridanes, which dissociated to MA and alcohols at 77 K upon UV-irradiation.
TELLURIUM DIOXIDE OXIDATION OF STILBENE DIBROMIDES TO BENZILS
Authors: Suzuki Hitomi , Ninomiya Keiji , Inouye Masahiko
Published: July 2006

Tellurium dioxide reacts with stilbene dibromides in hot acetic acid to give benzils in good to moderate yields.
HYDROGEN PRESSURE-INDUCED OPTICAL DENSITY CHANGES OF METAL-LOADED TITANIA OBSERVED BY HIGH-PRESSURE INFRARED SPECTROSCOPY
Authors: Komiyama Masaharu , Izumisawa Miki , Okamoto Toshihiro , Ogino Yoshisada
Published: July 2006

A high-pressure in situ IR study revealed a reversible hydrogen pressure-induced optical density change of titania catalyzed by metals dispersed on its surface. The phenomenon may be attributed to a reversible charge transfer from the adsorbed hydrogen to the titania support.
THE ADSORPTION OF ETHYL ACETOACETATE ON NICKEL MODIFIED WITH D-α-ALANINE STUDIED BY POLARIZATION MODULATION IR SPECTROSCOPY
Authors: Hatta Aritada , Kobayashi Takashi , Wadayama Toshimasa , Suëtaka Wataru
Published: July 2006

Polarization modulation infrared reflection spectroscopy has been used to obtain the absorption spectrum of ethyl acetoacetate (EAA) adsorbed on Ni modified with optically active D-α-alanine. The obtained spectrum can be explained in terms of a particular orientation of EAA on the modified Ni surface. The adsorption of EAA exerts some influence upon the spectrum of D-α-alanine.
PHOTOREDLJCTION OF MANGANESE(III), IRON(III), COBALT(III), AND MOLYBDENUM(V) TETRAPHENYLPORPHYRINS IN 2-METHYLTETRAHYDROFURAN
Authors: Imamura Taira , Jin Takashi , Suzuki Toru , Fujimoto Masatoshi
Published: July 2006

The central metals in the metallotetraphenylporphyrins with axial halo or pseudohalo ligands, MnIII(tpp)X (tpp = 5,10,15,20-tetraphenylporphinato; X = I, Br, Cl, OAc, NCS), FeIII(tpp)Cl, CoIII(tpp)Cl, and MoVO(tpp)X (X = Br, Cl, F, NCS, N3), in 2-methyltetrahydrofuran are photoreduced with visible light at room temperature to form MnII(tpp), FeII(tpp), CoII(tpp), and MoIVO(tpp), respectively.
UNPRECEDENTED GAMMA-SELECTIVE MICHAEL ADDITION OF TIN(II) DIENOLATES TO ACYCLIC α,β-UNSATURATED KETONES
Authors: Stevens Rodney W , Mukaiyama Teruaki
Published: July 2006

Tin(II) dienolates were found to react exclusively at the gamma carbon with acyclic α,β-unsaturated ketones in the Michael sense. Either acyclic 1,7-diketones or 2-cyclohexenol derivatives could be obtained in moderate to excellent yields by appropriate choice of reaction parameters. Moreover, in the latter case, only a single cyclohexenol adduct was afforded.
(8R,14S)-8-SENECIOYLOXY-14,15-EPOXYTHAPSAN-14-OL, NEW SESQUITERPENOID FROM THAPSIA VILLOSA VAR. MINOR. A 2D NMR STUDY
Authors: Teresa Joaquín de Pascual , Moran Joaquín R , Grande Manuel
Published: July 2006

The structure of the title compound has been established on the basis of NMR (1D and 2D COSY, NOESY, one bond and long range HCCORR) and CD spectra. The name thapsane is suggested for the novel natural skeleton (1R,6R,8R,9R)-1,2,2,6,8,9-hexamethylbicyclo[4.3.0]nonane.
SIMPLE AND EFFICIENT ENTRIES TO THE BASIC CARBON SKELETONS OF SOME KINDS OF TERPENOIDS FROM A FUNCTIONALIZED TRICYCLO[6.3.1.03,8]DODEC-4-ENE
Authors: Shishido Kozo , Hiroya Kou , Fukumoto Keiichiro , Kametani Tetsuji
Published: July 2006

The basic carbocyclic frameworks of stemodane, cedrane, hydroazulene, and himachalene type terpenoids are newly synthesized from a common tricyclic ketone, which is readily obtained via an intramolecular Diels–Alder reaction of a trienone, by simple manipulations.
HEXACARBONYLMOLYBDENUM- OR NONACARBONYLDIIRON-INDUCED REACTION OF 1,3-OXAZEPINE RING SYSTEM. EVIDENCE FOR THE VALENCE ISOMERIZATION BETWEEN 1,3-OXAZEPINE AND PYRIDINE-2,3-OXIDE
Authors: Nitta Makoto , Kobayashi Tomoshige
Published: July 2006

Upon treatment with [Mo(CO)6] or [Fe2(CO)9], phenyl-substituted 1,3-oxazepines undergo the C-2-O and C-7-O bond cleavage to give pyridine and pyrrole derivatives via a coordinated pyridine-2,3-oxide.
VAPOR PHASE CARBONYLATION OF METHYL CHLOROACETATE
Authors: Shinoda Kiyonori , Yasuda Kensei
Published: July 2006

The vapor phase carbonylation of methyl chloroacetate (MCA) with rhodium trichloride supported on active carbon was carried out at 200–300 °C. Dimethyl malonate (DMM) was obtained in good yield without any side reactions.
LASER-INDUCED FLUORESCENCE DETECTION OF CN, OH, AND N2+ PRODUCED By CONTROLLED ELECTRON IMPACT
Authors: Kawazumi Hirofumi , Ogawa Teiichiro
Published: July 2006

Combination of electron-impact excitation and laser-induced fluorescence offers a useful technique for a detection of the dissociation fragments. The rotational temperatures of CN, OH, and N2+ produced By controlled electron impact on CH3 CN, H2O, and N2O were 550±20, 560±100, and 400±20 K, respectively.
1,3-REARRANGEMENT OF ALLYLIC p-TOLYL SULFONES CATALYZED By [Pd(PPh3)4] AND ITS APPLICATION TO THE SYNTHESIS OF α,β-UNSATURATED KETONES
Authors: Inomata Katsuhiko , Murata Yasue , Kato Hisatoyo , Tsukahara Yuhko , Kinoshita Hideki , Kotake Hiroshi
Published: July 2006

The treatment of allylic p-tolyl sulfones with a catalytic amount of [Pd(PPh3)4] gave the 1,3-rearrangement products in high yields. A convenient method for the preparation of α,β-unsaturated ketones using [Pd(PPh3)4] as a catalyst from the 1,3-rearrangement products, 2-tosylhomoallyl alcohols, is also described.
TWO COMPLEMENTARY METHODS FOR INTRODUCTION OF gem-DIMETHYL GROUP IN HEXOPYRANOSIDE RING
Authors: Hashimoto Hironobu , Kawauchi Nobuya , Yoshimura Juji
Published: July 2006

Hexopyranosides having a gem-dimethyl group in the pyranose ring were synthesized By reductive cleavage of spiro-cyclopropane derivatives and By addition of methyl cuprates to methyl-branched enolone derivatives.
2,3,4,5-TETRAHYDRO-1,6-DIETHYL-3,4-PROPANO-6a-THIA(SIV)-1,3,4,6-TETRA-AZAPENTALENE-2,5-DITHIONE
Authors: Matsumura Noboru , Tomura Masaaki , Yoneda Sigeo , Toriumi Koshiro
Published: July 2006

A new heteropentalene, 2,3,4,5-tetrahydro-1,6-diethyl-3,4-propano-6a-thia (SIV)-1,3,4,6-tetra-azapentalene-2,5-dithione, was synthesized by a convenient one pot reaction, and its structure was determined by a single crystal X-ray diffraction.
ASYMMETRIC DIELS–ALDER REACTION PROMOTED BY A CHIRAL TITANIUM REAGENT
Authors: Narasaka Koichi , Inoue Masayuki , Okada Naoko
Published: July 2006

The asymmetric Diels–Alder reaction between prochiral dienes and dienophiles prepared from α,β-unsaturated acids and 1,3-oxazolidin-2-one proceeds by the use of a chiral alkoxy titanium(IV) to give the corresponding cycloadducts in high enantioselectivity.
The Origin of Regio- and Stereoselectivities in 1,3-Cycloadditions of Azomethine Ylides Generated from N-(Benzylidene)trimethylsilylmethylamine and the Related Compounds
Authors: Imai Nobuyuki , Tokiwa Hiroaki , Akahori Yukio , Achiwa Kazuo
Published: July 2006

The frontier molecular orbital theory (ab initio procedures) was found to clearly explain the regio- and stereoselectivities in 1,3-dipolar cycloadditions of the azomethine ylides to conjugated olefins yielding the pyrrolidines.
Geochemical Characterization of Suspended Particles in Estuarine and Coastal Seawater by X-Ray Fluorescence Spectrometry
Authors: Akagi Tasuku , Haraguchi Hiroki
Published: July 2006

The elemental compositions of suspended particles collected in Tokyo Bay and Tamagawa River Estuary were determined by X-ray fluorescence spectrometry. It has been found that the concentrations of Al, Ti, and Fe in SP were decreased more rapidly than those of Si, Ca, K, Cu, and Zn from the estuarine to the bay areas.
Transition Metal Catalyzed Reduction of Azidoarenes to Aminoarenes with Carbon Monoxide–Water System
Authors: Shim Sang Chul , Choi Kui Nam , Yeo Young Kuk
Published: July 2006

Azidoarenes were readily transformed to aminoarenes in good yiels under mild conditions with carbon monoxide and water in the presence of a catalytic amount of rhodium(III) complex, which is more catalytically active than rhodium(I) or palladium(II) complexes.
Oxidative Dimerization of Methane over Promoted Magnesium Oxide Catalysts. Important Factors
Authors: Moriyama Takeshi , Takasaki Nobuhiro , Iwamatsu Eiji , Aika Ken-ichi
Published: July 2006

Various metal doped MgO samples were examined as catalysts for the conversion of methane to ethane and ethylene. Of these, 15 mol% Na+–MgO was found to show the highest C2 hydrocarbon yield (22.4%) with a C2 selectivity of 57% at 1073 K at a CH4/O2 ratio of 2.0.
Preparation of Optically Active α-Acetoxyacylophenones via Enzyme Mediated Hydrolysis
Authors: Ohta Hiromichi , Ikemoto Mitsushi , II Hiroyuki , Okamoto Yasushi , Tsuchihashi Gen-ichi
Published: July 2006

Microorganisms that hydrolyzes α-acetoxyacylophenones were screened, and it was found that Pichia miso IAM 4682, a type culture belonging to yeast, gave the best results. The esterase of this microbe hydrolyzed (R)-acetates in a highly enantioselective manner.
Stereospecific Photochemical Cyclization of Azidoquinone with E,E- and Z,Z-Dienes. Application to the Synthesis of an Important Precursor toward Mitomycins
Authors: Naruta Yoshinori , Nagai Naoshi , Yokota Tadafumi , Maruyama Kazuhiro
Published: July 2006

Photochemical reaction of 5-azido-2-methoxy-3-methyl-1,4-benzo quinone with cis,cis-2,4-hexadien-1,6-diol derivatives stereoselectively affords the corresponding 2,3-dihydroindolequinone, which possesses trans configuration at 2,3-position and vinylic double bond preserves the original stereochemistry of the diene. It is efficiently converted to a key precursor in mitomycin synthesis.
Palladium Catalyzed Iminocarbonylation of Bromobenzene with Isocyanide and Organotin Compounds
Authors: Kosugi Masanori , Ogata Toshimi , Tamura Hiroyuki , Sano Hiroshi , Migita Toshihiko
Published: July 2006

Palladium catalyzed reactions of ternary systems involving bromobenzene, t-butyl isocyanide, and organotin compounds were found to occur giving the corresponding imines, although the catalytic efficiencies were rather low.
Selective Oxidative Coupling of Methane over Supported Lead Oxide Catalyst
Authors: Asami Kenji , Hashimoto Shigeru , Shikada Tsutomu , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

It was found that lead oxide catalysts supported on basic materials such as MgO and β″-Al2O3 were excellent catalysts for the oxidative coupling of methane to C2 hydrocarbons. For example, PbO/MgO catalyst gave 11.1 mmol/g·h of C2 STY and 87% of C2 selectivity under the conditions of 750 °C, W/F=1.0 g·h/mol, P(CH4)=61 kPa, P(O2)=1.6 kPa and atmospheric pressure.
CONTINUOUS-FLOW DEMONSTRATION OF THE Mg–S–I CYCLE FOR THERMOCHEMICAL HYDROGEN PRODUCTION
Authors: Kumagai Toshiya , Mizuta Susumu
Published: July 2006

The Mg–S–I water-splitting cycle was demonstrated on a laboratory scale by developing a continuous-flow system including solid-reactant transportation. The whole system was satisfactorily operated for 33 hours with roughly constant production of 0.5 dm3 of H2 and 0.25 dm3 of O2 per hour.
Preparation and Photoreactions of Bispyridylnorbornadienes
Authors: Yamashita Yoshiro , Hanaoka Takaaki , Takeda Yasuyuki , Mukai Toshio
Published: July 2006

Bispyridylnorbornadienes were synthesized using the Diels–Alder reaction of HBF4 salts of bispyridylacetylenes with cyclopentadiene. They underwent the photocyclization to give quadricyclanes which reverted to norbornadienes by heating or a catalyst. Bis(N-methylpyridyl)norbornadienes were also synthesized and the photoreactions were investigated.
Facile Synthesis of 2-Substituted Aminobenzoxazole. One Pot Cyclodesulfurization of N-(2-Hydroxyphenyl)-N′-phenylthioureas with Superoxide Radical Anion
Authors: Chang Hae Sung , Yon Gyu Hwan , Kim Yong Hae
Published: July 2006

Treatment of N-(2-hydroxyphenyl)-N′-phenylthioureas with the superoxide radical anion (O2\ewdot) at 20 °C in CH3CN, THF, or DMSO resulted in the formation of 2-substituted aminobenzoxazoles in excellent yields.
Perylene–Hexacyanobutadiene (HCBD) Complex
Authors: Yamochi Hideki , Saito Gunzi , Sugano Tadashi , Kinoshita Minoru , Katayama Chuji , Tanaka Jiro
Published: July 2006

Hexacyanobutadiene (HCBD) gives dark red single crystals with equimolar perylene. The crystal structure analysis shows that the complex has mixed regular stacks. The physical properties of the single crystals indicate that the complex is an insulator with neutral ground state and close to neutral-ionic boundary.
ASYMMETRIC OXIDATION OF OLEFINS WITH OSMIUM TETROXIDE COORDINATED BY CHIRAL DIAMINES DERIVED FROM L-TARTARIC ACID
Authors: Yamada Tohru , Narasaka Koichi
Published: July 2006

The enantioselective oxidation of olefins with OsO4 coordinated by chiral diamines derived from L-tartaric acid is described. Phenylketene dimethylacetal and trans-stilbene are converted to (R)-methyl mandelate and (1R,2R)-1,2-diphenyl-1,2-ethanediol with moderate and high enantioselectivity, respectively.
Dynamic NMR Technique Can Detect the Difference in Proton Affinities of 9-[2-(Diethylamino)methyl-6-methylphenyl]fluorene Rotamers
Authors: Nakamura Mikio , Oki Michinori
Published: July 2006

The proton exchange processes in the trifluoroacetates of the title compound were detected by the NMR method: whereas the free energy of activation for the exchange process in the ap rotamer in CDCl3 was 16.4 kcal/mol at 298 K, that in THF-ds was 13.7 kcal/mol. In contrast, the sp rotamer exhibited the free energy of activation for the same process of 14.1 and 13.4 kcal/mol in CDCl3 and THF-d8, respectively. The presence of NH-π interactions in the ap rotamer and the absence of it in the sp are concluded to be responsible to the difference in CDCl3.
Self-Oscillation of Electric Potential of a Porous Membrane Impregnated with Polymer Multi-Bilayer Complexes
Authors: Toko Kiyoshi , Nakashima Naotoshi , Iiyama Satoru , Yamafuji Kaoru , Kunitake Toyoki
Published: July 2006

A self-sustained oscillation of electric potential across a porous membrane impregnated with polyion complexes of ammonium bilayers and an anionic polymer was observed. The oscillation was associated with the phase transition of immobilized multi-bilayers.
A Facile Method for the Oxidation of Aldehydes to Carboxylic Acids via Acetal-type Diperoxides
Authors: Mukaiyama Teruaki , Miyoshi Norikazu , Kato Jun-ichi , Ohshima Masahiro
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, aldehydes smoothly react with t-butyl trimethylsilyl peroxide to give the acetal-type diperoxides in good yields. Treatment of these diperoxides with piperidine at 90 °C or the aqueous solution of CUSO4 and L-ascorbic acid at room temperature gave the corresponding carboxylic acids in good yields.
INCOMPLETE CUBANE-TYPE SULFUR-CAPPED Mo3OS34+ AQUA ION AND X-RAY STRUCTURE ANALYSIS OF Ba[Mo3OS3(HN(CH2CO2)2)3]·7H2O
Authors: Shibahara Takashi , Miyake Hiroaki , Kobayashi Kazuhiro , Kuroya Hisao
Published: July 2006

A molybdenum(IV) aqua ion with sulfur bridges, Mo3OS34+, has been prepared and characterized. An X-ray structure analysis of the iminodiacetato complex prepared from the aqua ion has revealed the core structure of Mo3(μ-O)(μ-S)2(μ3-S).
Synthesis of Acromelic Acid B, a Toxic Principle of Clitocybe acromelalga
Authors: Hashimoto Kimiko , Konno Katsuhiro , Shirahama Haruhisa , Matsumoto Takeshi
Published: July 2006

Acromelic acid B was synthesized from kainic acid through our newly developed method of pryidine synthesis.
Crystal and Molecular Structure of Bis-1,2,5-thiadiazolotetracyano-quinodimethane. A Noval Acceptor Forming Highly Conductive Complexes
Authors: Kabuto Chizuko , Suzuki Takanori , Yamashita Yoshiro , Mukai Toshio
Published: July 2006

The crystal structure of bis-1,2,5-thiadiazolotetracyanoquinodimethane showed stacks of two-dimensionally expanded sheet-like networks, in which the roughly coplanar molesules are connected to one another by way of the rhombohedral linkage involving short S–NC contacts of 3.03 Å.
A Bioreactor Used for the On-Line Determination of Cholesterol Distribution in Human Serum Lipoprotein Classes
Authors: Makino Keisuke , Sasaki Ichiro , Takeuchi Tamio , Umino Masuo , Hara Ichiro
Published: July 2006

On-line detection of cholesterol in each human serum lipoprotein class could be performed by combining a bioreactor system prepared by immobilizing cholesterol ester hydrorase and cholesterol oxidase on the same matrix with a metal free size-exclusion chromatographic system separating different classes of lipoproteins.
Synthesis and Consecutive Double Diels–Alder Cycloadditions of 3-Methylene-5-phenylsulfinyl-1-pentene as a Synthetic Equivalent of Parent Cross-conjugated Triene, 3-Methylene-1,4-pentadiene
Authors: Wada Eiji , Nagasaki Noritaka , Kanemasa Shuji , Tsuge Otohiko
Published: July 2006

3-Methylene-5-phenylsulfinyl-1-pentene undergoes stepwise double Diels–Alder cycloadditions with two different dienophiles to afford hydronaphthalene skeletons. This sequence corresponds to cross type of diene-transmissive Diels-Alder cycloaddition of parent 3-methylene-1,4-pentadiene.
Cation Assisted Lattice Improvement of Highly Siliceous ZSM-5 upon Prolonged Heat Treatment
Authors: Kraushaar Bettina , Haan Jan W de , Ven Leo J M van de , Hooff Jan H C van
Published: July 2006

Prolonged heat treatment of highly siliceous, template-free ZSM-5 containing Na+ or K+ causes improvement of the lattice structure, migration of alkaline ions to the outer layers of the zeolite particles as shown by XPS and an increased isolation of ≡ Si–ONa sites from ≡ Si–OH sites, as shown by 29Si CP MAS NMR analyses of silylated products.
CYCLIC VOLTAMMETRY OF p-TROPOQUINONES
Authors: Mori Akira , Kusaba Tomoyuki , Isayama Yasutoshi , Takeshita Hitoshi
Published: July 2006

The first and the second half-wave potentials of p-tropoquinones measured by CV are linear to the Hammett’s Σσp and Σσm, respectively. Their smaller electrostatic repulsion than p-benzoquinones can be attributable to the characteristic three carbonyl system.
Clay Montmorillonite-Catalyzed Aldol Reactions of Silyl Enol Ethers with Aldehydes and Acetals
Authors: Kawai Motomitsu , Onaka Makoto , Izumi Yusuke
Published: July 2006

By the use of clay montmorillonite as a catalyst, cross aldol adducts are obtained from silyl enol ethers and aldehydes or acetals. The diastereoselectivity in the reaction is significantly sensitive to the solvent used.
Reductive Coupling of 2,2-Dibromo-1,1,1,3,3,3-hexaalkyltrisilanes. A Novel Route to Persilylcyclotetrasilanes of the Type [(R1R2R3Si)2Si]4
Authors: Matsumoto Hideyuki , Yokoyama Noriyasu , Sakamoto Atsushi , Aramaki Yumiko , Endo Reiko , Nagai Yoichiro
Published: July 2006

Persilylcyclotetrasilanes of the type [(R1R2R3Si)2Si]4 (R1 = R2 = R3 = Me; R1 = Et, R2 = R3 = Me) were readily obtained by the reductive coupling of the corresponding 2,2-dibromo-1,1,1,3,3,3-hexaalkyltrisilanes using sodium; the Si4 frameworks of these persilyl compounds act as much more intense chromophore than those of peralkyl analogues.
Anomalous Fluorescence Quenching of Pyrene by Methylviologen in Aqueous Solution. The Formation of Ground-State Nonfluorescent Complex between the Reactants
Authors: Kusumoto Yoshihumi , Ihara Satoru , Kurawaki Junichi , Satake Iwao
Published: July 2006

The quenching of pyrene fluorescence by methylviologen in aqueous solution proceeded via both dynamic and static processes. It was shown that the formation of a ground-state “dark” complex between the reactants is responsible for the latter process.
Novel Substituent Effect Controlling the Stability of α-Azohydroperoxides
Authors: Tezuka Takahiro , Ando Setsuo
Published: July 2006

Several substituted α-azohydroperoxides were prepared, and their stabilities were found to be strongly controlled by novel substituent effects. The general trend of the effects was deduced.
Isotachophoretic Analysis of Sequence-Isomeric Nucleotides in the Presence of Sequence-Selective Intercalator
Authors: Dohtsu Kunihiko , Katayama Yoshiki , Takagi Makoto
Published: July 2006

A new chromatographic technique for separating oligonucleotide sequence isomers is described. Nucleotide isomers are chromatographed in the presence of organic reagent which binds to polynucleotides or DNA sequence-selectively. The separation between CpG and GpC was achieved in an isotachophoresis mode by using quinacrine as “intercalator” under neutral pH conditions.
119Sn-Moessbauer Spectroscopic Studies of Tin(IV) Chloride Adducts of Ferrocenylruthenocene and Biruthenocene
Authors: Watanabe Masanobu , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

An orange colored stable adduct of SnCl4 with biruthenocene was prepared by treating SnCl4 with biruthenocene in a dry solution of benzene mixed with hexane, while a less stable adduct with ferrocenylruthenocene was obtained in the same procedure. Covalently bonded tin(IV) species were found in 119Sn-Moessbauer spectroscopy of both the adducts. The results suggest the presence of a direct chemical bonding between Ru and Sn atoms in these adducts.
A NOVEL NUCLEOPHILIC SUBSTITUTION OF THE FORMYL GROUP IN p-NITROBENZALDEHYDE WITH SOME CARBANIONS
Authors: Iwasaki Genji , Saeki Seitaro , Hamana Masatomo
Published: July 2006

p-Nitrobenzaldehyde reacts with some active methylene compounds in the presence of a strong base at low temperatures to give p-substituted nitrobenzenes by the two-step course involving the initial formation of the aldol adducts and the subsequent displacement of the carbinol moieties with excess carbanions.
Remarkable Steric Control for the Enantioselective Cleavage of Amino Acid Esters
Authors: Ueoka Ryuichi , Matsumoto Yoko , Yoshino Takashige , Watanabe Noboru , Omura Kazushi , Murakami Yukito
Published: July 2006

The perfect enantioselective catalysis was observed for the hydrolytic cleavage of p-nitrophenyl N-dodecanoyl-d(l)-phenylalaninates by N-benzyloxycarbonyl-l-phenylalanyl-l-histidyl-l-leucine in specific co-aggregates composed of a cationic doublechain surfactant and a cationic, an anionic, or a nonionic single-chain surfactant.
Crystal Structures of Bromo-Bridged One-Dimensional Mixed-Metal Compounds, [NiII(en)2][PtIVBr2(en)2](ClO4)4 and [PdII(en)2][PtIVBr2(en)2](ClO4)4
Authors: Toriumi Koshiro , Yamashita Masahiro , Murase Ichiro
Published: July 2006

The metal-alternated linear chain structures of the title compounds have been determined by X-ray analyses. Their structural parameters along the chains in the hetero-metal systems show weak MII···M′IV interactions compared with the homo-metal systems.
Structural Revision of Isoconcinndiol by Its Synthesis
Authors: Fujiwara Shigeki , Takeda Kunio , Uyehara Tadao , Kato Tadahiro
Published: July 2006

The originally proposed formula of isoconcinndiol was revised to (3R*,8S*,13R*)-enantio-labd-14-ene-8,13-diol by its synthesis.
REACTION OF 1-TRIMETHYLSILYLCYCLOPROPYLLITHIUM DERIVATIVES WITH DICHLORO-METHYL METHYL ETHER. A NOVEL SYNTHESIS OF CYCLOPROPYL SILYL KETONES
Authors: Nakajima Tadashi , Tanabe Masaru , Ohno Katsuhiko , Segi Masahito , Suga Sohei
Published: July 2006

Treatment of 1-trimethylsilylcyclopropyllithium derivatives with dichloromethyl methyl ether affords the corresponding new cyclopropyl silyl ketones in moderate yield. This reaction involves the intramolecular 1,2-silicon shift from carbon to carbon.
The Highly Stereoselective Michael Reaction of α,β-Unsaturated Ketones with Silyl Enol Ethers of Thioesters Catalyzed by Trityl Salts. A Facile Stereoselective Synthesis of 5-Oxocarboxylic Acid Ester Derivatives
Authors: Mukaiyama Teruaki , Tamura Masanori , Kobayashi Shu
Published: July 2006

In the presence of a catalytic amount of trityl salts, silyl enol ethers of thioesters stereoselectively react with α,β-unsaturated ketones to afford the Michael adducts in high yields. 5-Oxocarboxylic acid ester derivatives, useful synthetic precursors of various naturally occurring compounds, are stereoselectively obtained by this procedure.
Unusual Farnesyl Pyrophosphate Synthetase Reaction of an Artificial Substrate with Ni2+
Authors: Maki Yuji , Watanabe Gotaro , Saito Akio , Koyama Tanetoshi , Ogura Kyozo
Published: July 2006

Farnesyl pyrophosphate (FPP) synthetase catalyzed the condensation of geranyl pyrophosphate (GPP) with 4-methyl-4-pentenyl pyro phosphate in the presence of Ni2+ to give an unexpected product, homofarnesyl pyrophosphate having an exomethylene group, together with Z-homofarnesyl pyrophosphate.
Separation of Isomeric Alcohols by Selective Complexation with N,N,N′,N′-Tetracyclohexylfumaramide and N,N,N′,N′-Tetraisopropylfumaramide, and Structures of Two Resulting Crystalline Adducts
Authors: Toda Fumio , Tagami Yasunori , Mak Thomas C W
Published: July 2006

The title host compounds have been utilized in the efficient separation of isomeric alcohols by selective complexation. X-Ray analysis has shown that their 1:2 crystalline adducts with cresols comprise centrosymmetric guest–host–guest aggregates consolidated by O–H···O hydrogen bonding.
Photoluminescent Properties of p-GaAs/Electrolyte Interface. Evidence for Bandedge Shift during Photoelectrochemical Hydrogen Evolution Reaction
Authors: Kaneko Susumu , Uosaki Kohei , Kita Hideaki
Published: July 2006

When the potential of p-GaAs electrode was pulsed from −1.0 V (vs. Ag/AgCl) to a potential more positive than ca. −0.35 V, PL intensity increased sharply and the PL spectrum broadened but the intensity declined and the spectrum shrank gradually with time. These results are explained by the bandedge shift during the photoelectrochemical hydrogen evolution.
The Asymmetric Diels–Alder Reaction by the Use of a Catalytic Amount of a Chiral Titanium Reagent
Authors: Narasaka Koichi , Inoue Masayuki , Yamada Tohru
Published: July 2006

The Diels–Alder reaction between prochiral dienophiles and cyclopentadiene proceeds in an enantioselective manner by the use of a catalytic amount of a chiral alkoxy titanium(IV) in the presence of Molecular Sieves 4A.
A NONCYCLIC NEUTRAL CARRIER EXHIBITING EXCELLENTLY Li+-SELECTIVE TRANSPORT
Authors: Hiratani Kazuhisa , Taguchi Kazuhiro , Sugihara Hideki , Okada Tatsuhiro
Published: July 2006

3,3-Bis(8-quinolyloxymethyl)oxetane, which has been newly synthesized as a carrier in the cation transport through liquid membranes, exhibits extremely high Li+-selectivity. From the investigation of structural effect, introduction of 8-quinolyl terminal group, oxetane ring, and trimethylene chain to the structure of carrier is suggested to be important for excellent Li+-selectivity.
Synthesis of Pseudo-Disaccharide Derivative Having d-Manno Configuration, an Acarviosin Analogue
Authors: Ogawa Seiichiro , Sugizaki Hiroyasu
Published: July 2006

Acarviosin analogue, 4-deoxy-4-{[(1S)-(1,4/5,6)-4,5,6-trihydroxy-3-hydroxymethyl-2-cyclohexen-1-yl]amino}-d-mannopyranose, has been synthesized as the octaacetyl derivative by coupling of 1,6:3,4-dianhydro-2-O-tosyl-3-d-galactopyranose and the cyclohexenylamine derivative, followed by further transformation.
Preparation of Heat Resistant Ceramic Support with Large Surface Area from Composite Alkoxides
Authors: Machida Masato , Eguchi Koichi , Arai Hiromichi
Published: July 2006

The surface area of BaO·6Al2O3 was greatly enhanced by the preparation from alkoxide compared with that prepared from BaCO3/γ-Al2O3 mixture, and the maximum value attained after calcination at 1600 °C was 11.0 m2/g. The preparation from alkoxides reduces the temperature for the formation of BaO·Al2O3 because of uniform mixing of the components. The large surface area of support brings about high catalytic activity for combustion of methane.
Nascent Vibrational Distribution of CO+(A2Π) Resulting from the He(23S) + CO Penning Ionization in a Low-pressure Apparatus
Authors: Sekiya Hiroshi , Tsuji Masaharu , Nishimura Yukio
Published: July 2006

Nascent vibrational distribution of CO+(A2Π) produced from the He(23S) + CO Penning ionization has been determined by optical emission spectroscopy. Experiments were performed by using a new low-pressure apparatus utilizing a mild expansion of helium metastable atoms generated in a flow tube.
Regio- and Stereo-selective Oxidation of gem-Dimethyl Olefins via [2,3]-Sigmatropic Rearrangement of Allyl Amine Oxides
Authors: Inoue Seiichi , Iwase Norimichi , Miyamoto Osamu , Sato Kikumasa
Published: July 2006

Highly regio- and stereo-selective oxidation sequences are described for the efficient conversion of the gem-dimethyl olefin terminus of acyclic terpenes to terminal trans-allylic alcohols and trans-α,β-unsaturated aldehydes.
Photolysis of 7-Oxanorbornadienes Condensed with Tropone. A Facile Formation of 6-Hydroxyazulenes
Authors: Nakazawa Tomoo , Ashizawa Mariko , Jinguji Mamoru , Yamaguchi Masakazu , Murata Ichiro
Published: July 2006

Irradiation of 12-oxatricyclo[7.2.1.02,8]dodeca-2(8),3,6,10-tetraen-5-ones having one or two bridge-head alkyl substituents in methanol with high pressure Hg lamp gave 6-hydroxy- or 1-alkyl-6-hydroxyazulenes together with 3-acyl- or 1-alkyl-3-acylazulenes as by-products in good combined yields.
Asymmetric Microbial Oxidation of Formaldehyde Dithioacetals
Authors: Okamoto Yasushi , Ohta Hiromichi , Tsuchihashi Gen-ichi
Published: July 2006

Incubation of formaldehyde dithioacetals with growing cells of Corynebacterium equi IFO 3730 afforded a variety of oxidation products depending on the structure of the substrates. The products with sulfoxide moiety were optically pure and had R configuration.
Crystal and Electronic Structures of (BEDT-TTF)AuCl2AuCl4
Authors: Mori Takehiko , Inokuchi Hiroo
Published: July 2006

Electrochemical crystallization of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) in the presence of AuCl4− has yielded an organic conductor with the composition of (BEDT-TTF)AuCl2-AuCl4. X-ray analysis shows that the AuCl2− anions are incorporated in the two-dimensional network of BEDT-TTF, and these networks are separated by the AuCl4− anions.
Cyclodextrin-Palladium Chloride. New Catalytic System for Selective Oxidation of Olefins to Ketones
Authors: Harada Akira , Hu Ying , Takahashi Shigetoshi
Published: July 2006

Terminal olefins are oxidized to ketones in high yields under mild conditions using palladium chloride and cyclodextrins as catalysts in two-phase systems; cyclodextrins show substrate selectivity.
1-Substituted 3,6-Dihydroxybenzocyclobutene. A Versatile Precursor of Naturally Occurring Quinones
Authors: Iyoda Masahiko , Kitami Sumiko , Yamauchi Tetsuhiro , Oda Masaji
Published: July 2006

Simple and convenient routes to the title compounds using photoaddition of 5,6-dichloro-2-cyclohexene-1,4-dione to olefins, followed by reduction with a low valent nickel complex or by dehydrochlorination with 2,6-lutidine as key steps are described.
Asymmetric Induction in the Alkylation of Enolate Anion with the Optically Active Selenonium Ions
Authors: Kobayashi Michio , Koyabu Kyoko , Shimizu Toshio , Umemura Kazuyuki , Matsuyama Haruo
Published: July 2006

Alkylation of the enolate anion of 2-methoxycarbonyl-1-indanone with optically active dialkylphenyl selenonium salt resulted in the formation of optically active C-alkylated products. Absolute configuration of the optically active selnonium ion was estimated on the basis of the asymmetric alkylation and CD spectra.
The Effect of the Hydrogen Bonding on the Photoinduced Electron Transfer Reaction of a Naphthalene–Triethylamine System in the Presence of Alcohols
Authors: Oh Shin-Choi , Shirota Yasuhiko , Mikawa Hiroshi , Kusabayashi Shigekazu
Published: July 2006

The effect of the addition of alcohols on the photoinduced electron transfer reaction of a naphthalene–triethylamine system has been studied. The results show that the addition of alcohol reduces both bimolecular rate constants for the quenching of the naphthalene fluorescence by triethylamine and the quantum yields for the formation of products, in the order of 2-methyl-2-propanol < 2-propanol < ethanol < methanol. These results are explained in terms of hydrogen-bonding interactions between the amine and alcohols, which suppress the electron transfer process.
Synthesis of New Donors, “TTF-dimer”s
Authors: Nishikawa Etsushi , Tatemitsu Hitoshi , Sakata Yoshiteru , Misumi Soichi
Published: July 2006

New donors, “TTF-dimer”s in which two TTF units are perpendicularly fixed have been synthesized. Redox potentials indicate that their donor abilities are somewhat reduced compared with those of corresponding “TTF-monomer”s. Present donors form CT complexes with DDQ.
DONNAN DIALYSIS DESALINATION
Authors: Igawa Manabu , Echizenya Kiyoyuki , Hayashita Takashi , Seno Manabu
Published: July 2006

Desalination was effectively carried out with the cell in which a salt solution was separated from hydrochloric acid with a cation-exchange membrane and from sodium hydroxide solution with an anion-exchange membrane. Donnan dialysis occurred in the cell, cations and anions were exchanged with protons and hydroxide ions, and neutralization and desalination proceeded simultaneously.
A KINETIC STUDY OF COUPLED INTERNAL ROTATION IN RACEMIC 2,3-BENZO-9-TRIPTYCYL 2-(DIMETHYLAMINOMETHYL)-9-TRIPTYCYL ETHER BY MEANS OF EXCIPLEX FLUORESCENCE DYNAMICS
Authors: Koga Noboru , Iwamura Hiizu
Published: July 2006

Kinetic parameters for fluorescence dynamics of the title di(9-triptycyl) ether have been obtained by the transient experiments. The temperature dependence of the rate constants gave the activation energy value of 4.2 kcal mol−1 for the gear-meshing torsional motion in the di(9-triptycyl) ether.
PRECISE CONTROL OF AMOUNT OF ELECTRODEPOSITED Pt BY USING THE LANGMUIR–BLODGETT FILM AND ITS APPLICATION TO ELECTROCATALYSIS OF MOLECULAR OXYGEN REDUCTION
Authors: Fujihira Masamichi , Poosittisak Suta
Published: July 2006

The amount of Pt deposited on a glassy carbon (GC) electrode can be controlled precisely by electrochemical reduction of PtCl62− incorporated as a counter ion in the Langmuir–Blodgett (LB) film coated on the electrode surface. Electrocatalysis of the resulting modified electrode for molecular oxygen reduction is also described.
CROSSED CLAISEN CONDENSATION OF 2-ALKYL-4,4-DIMETHYL-2-OXAZOLINES WITH ACID ANHYDRIDES BY ALUMINUM CHLORIDE AND TRIETHYLAMINE
Authors: Tohda Yasuo , Morikawa Masayoshi , Kawashima Toshihide , Ariga Masahiro , Mori Yutaka
Published: July 2006

Reactions of 2-prim-alkyl-4,4-dimethyl-2-oxazolines with alkanoic acid anhydrides having alpha hydrogens in the presence of aluminum chloride and triethylamine gave an oxazoline derivative of β-keto acids in moderate yields.
CONVENIENT METHODS FOR THE PREPARATION OF VINYLIC AND ALLYLIC SULFONES FROM ALKENES
Authors: Inomata Katsuhiko , Kobayashi Toshifumi , Sasaoka Shin-ichi , Kinoshita Hideki , Kotake Hiroshi
Published: July 2006

1 or 2-p-Toluenesulfonyl(=tosyl)-1-alkenes were regioselectively prepared from 1-alkenes via iodosulfonization or sulfonylmercuration, respectively. Conversion of 1-tosyl-1-alkenes to the corresponding allylic sulfones, 1-tosyl-2-alkenes, was achieved by the treatment of their acetonitrile solution with DBU in high yield.
CONDUCTING MONOLAYER OF SIMPLE CHARGE TRANSFER COMPLEX ON A GLYCERIN SUBPHASE
Authors: Nakamura Takayoshi , Takei Fumio , Tanaka Motoo , Matsumoto Mutsuyoshi , Sekiguchi Tatsuo , Manda Eiichiro , Kawabata Yasujiro , Saito Gunzi
Published: July 2006

The amphiphilic simple charge transfer complexes, TMTTF-octadecylTCNQ (1) and TTF-octadecylTCNQ, were synthesized. The conductivities of the monolayers were measured on a glycerin subphase. The complex 1 showed the conductivity of the order of 1 S cm−1, the highest value reported so far for the organic monolayer system.
SYNTHESIS OF BENZOPENTATHIEPINS. REACTIONS OF 1,3-BENZODITHIOLE-2-THIONE AND 1,2-BENZENEDITHIOL WITH ELEMENTAL SULFUR IN LIQUID AMMONIA
Authors: Sato Ryu , Saito Satoru , Chiba Hiroshi , Goto Takehiko , Saito Minoru
Published: July 2006

Benzopentathiepins were synthesized by new reaction of 1,3-benzodithiole-2-thiones and 1,2-benzenedithiols with elemental sulfur/liquid ammonia at ambient temperature in high yields.
PHOTOCHEMICAL AMINATION OF TETRACYANOBENZENE WITH ACETONITRILE IN THE PRESENCE OF ALIPHATIC AMINE
Authors: Yamada Shuzo , Nakagawa Yoshiki , Watabiki Oserojoin , Suzuki Shin-ichi , Ohashi Mamoru
Published: July 2006

Irradiation of dicyanoxylenes and dicyanodurene in acetonitrile in the presence of triethylamine gave mainly substitution and reduction products respectively, whereas a photochemical reaction of 1,2,4,5-tetracyanobenzene in the presence of N-methylpyrrolidine or nicotine gave tricyanoaniline, an amination product, as well as substitution products.
SOLID ACID-CATALYZED ALLYLATION OF ACETALS AND CARBONYL COMPOUNDS WITH ALLYLIC SILANES
Authors: Kawai Motomitsu , Qnaka Makoto , Izumi Yusuke
Published: July 2006

Acetals and carbonyl compounds are allylated with allylic silanes in good yields in the presence of a catalytic amount of clay montmorillonite.
A NEW THEORY FOR THE ANTI-PERIPLANAR EFFECT
Authors: Inagaki Satoshi , Iwase Koji , Mori Yoshio
Published: July 2006

The anti-periplanar effects, including the gauche and anomeric effects, are proposed to be brought about by the continuity of phase of the bonding (nonbonding) and anti-bonding orbitals of the anti-periplanar bonds and the bonding orbital of the intervening bond.