bluuebunny/crossref_metadata_2025 huggingface dataset:
ON THE REACTION MECHANISM OF THE RADIOLYSIS OF THE AQUEOUS NICOTINAMIDE ADENINE DINUCLEOTIDE
Authors: Aikawa Masayuki , Honna Takeshi , Sumiyoshi Takashi , Katayama Meiseki
Published: July 2006

The radiolysis studies of aqueous NAD+ solutions have been performed. It is suggested that NADH and (NAD)2 are produced in the irradiated solution. A reaction scheme including a dimerization of NAD free radicals and the formation of NADH is presented.
UNEXPECTED HIGH PHOTOOXIDIZING EFFICIENY OF BENZOPHENONE DERIVATIVES HAVING TETRAALKYLAMMONIUM SUBSTITUENTS
Authors: Tazuke Shigeo , Kawasaki Yasuhiro , Kitamura Noboru , Inoue Takashi
Published: July 2006

Benzophenone derivatives having various tetraalkylammonium ion in the 4 position (II, III, IV, and V) were found to be much more efficient sensitizers than benzophenone(I) in photooxidation of Leuco Crystal Violet(LCV) to Crystal Violet(CV+) in acetonitrile in air, which was interpreted in terms of the cationic atmosphere effect facilitating the primary electron transfer process from LCV to BP*3.
ASYMMETRIC ADDITION OF ACETYLIDE TO ALIPHATIC ALDEHYDES—PREPARATION OF OPTICALLY ACTIVE 5-OCTYL-2(5H)-FURANONE—
Authors: Mukaiyama Teruaki , Suzuki Keisuke
Published: July 2006

Various optically active acetylenic alcohols (40-80%e.e.) were obtained by enantioface-differentiating addition of lithium trimethylsilylacetylide to aliphatic aldehydes utilizing (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand. Optically active (R)-1-trimethylsilyl-l-undecyn-3-ol (80%e.e.) was transformed into optically active 5-octyl-2(5H)-furanone in good yield.
UNUSUAL BEHAVIOUR OF β-tert-ALKYLSTYRENES IN PHOTOSENSITIZED CIS–TRANS ISOMERIZATION. STRUCTURAL EFFECTS ON TRIPLET ENERGY TRANSFER
Authors: Arai Tatsuo , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

Photostationary state isomer ratios, rate constants for triplet energy transfer, and quantum yields of isomerization were determined for the triplet sensitized isomerization of β-alkylstyrenes (PhCH=CHR, R = CH3, CH2CH3, CH(CH3)2, C(CH3)3, and C(CH3)2CH2CH3) in benzene. The remarkably high ratio of cis-tert-alkylstyrenes at the photostationary state is mainly attributed to lower rate constants for energy transfer to cis-isomers than to trans-isomers.
PHOTOELECTROCHEMICAL STUDIES OF METALLOTETRAPHENYLPORPHYRIN ELECTRODES
Authors: Katsu Takashi , Tamagake Keietsu , Fujita Yuzaburo
Published: July 2006

Eight kinds of metallotetraphenylporphyrins(MeTPP’s) evaporated onto platinum plates were utilized as photoelectrodes in a wet cell, and their photo-induced voltage and current were measured under oxygen atmosphere. The largest photo-voltage(+0.6V) and cathodic photocurrent(4μA/cm2 at +0.1V vs. SCE) were observed with the PdTPP electrode. The photovoltage decreased in the order Pd(0.6V)>H2(0.4V) >Zn≅Cu(0.3V)>Mg(0.2V)>Pb(0.08V)>Ni(0.03V)>Co(∼0V), and, in parallel with this trend, the photocurrent also decreased. It was found that the photoeffect of the MeTPP’s was dependent on the oxidation potential except that the lifetime of the excited state of the porphyrin was extremely short.
INTERACTIONS OF ORGANIC SOLVENTS WITH PHOTORESPONSIVE CAPPED CYCLODEXTRIN IN AQUEOUS SOLUTION
Authors: Ueno Akihiko , Saka Rumiko , Osa Tetsuo
Published: July 2006

Azobenzene-capped β-cyclodextrin (I) forms complexes with organic solvents (methanol, DMSO, DMF, acetone and acetonitrile) according to 1:2 host/guest stoichiometry in its cis state, whereas exhibits nonstoichiometric behavior in its trans state.
OXIDATIVE CYCLISATION WITH THALLIUM (III) ACETATE: SYNTHESIS OF 3(2H)-BENZOFURANONES
Authors: Malaitong Nongyao , Thebtaranonth Chachanat
Published: July 2006

The reaction of thallium (III) acetate with enolisable o-hydroxy and o-methoxyphenyl ketones in acetic acid gave predominantly 2-acetoxy-3(2H)-benzofuranones.
ISOLATION OF BIS(TRISDIMETHYLAMINOPHOSPHONIUMMETHYLIDE)GOLD(I) CHLORIDE
Authors: Yamamoto Yoshihisa
Published: July 2006

Bis(trisdimethylaminophosphoniummethylide)gold(I) chloride, [(Me2N)3P–CH2–Au–CH2–P(NMe2)3]Cl, has been isolated and characterized by analytical and spectroscopic methods. It is stable in water and air.
MOLECULAR STRUCTURE OF DINACTIN
Authors: Nawata Yoshiharu , Hayashi Toshiaki , Iitaka Yoichi
Published: July 2006

The molecular conformation of dinactin, one of the homologues of macrotetrolide antibiotics nonactin, was determined by the X-ray diffraction method using a mixed crystal of dinactin and monactin (7:3). The conformation of the 32-membered ring looks a deformed cradle with an asymmetric shape, and can approximately be described as a hybrid of the nonactin and tetranactin type conformations. Dinactin type conformer has the lowest conformation energy among the three.
STRUCTURE AND ABSOLUTE CONFIGURATION OF TRANS(O)-N,N′-ETHYLENEBIS-(S-METHYL-l-CYSTEINATO)COBALT(III) PERCHLORATE
Authors: Isago Takashi , Okamoto Ken-ichi , Ohmasa Masaaki , Hidaka Jinsai
Published: July 2006

The crystal structure of trans(O)-N,N′-ethylenebis(S-methyl-l-cysteinato)cobalt(III) perchlorate was determined by X-ray diffraction study. The structure consists of two kinds of complex cations with asymmetric sulfur atoms of different absolute configuration (S(S)S(S) and R(S)S(S)). The differences between the configurations of the sulfur atoms in crystal and those in solution are discussed.
A NEW METHOD FOR DETERMINATION OF DISSOCIATION CONSTANTS OF SIMPLE ORGANIC ACIDS BY ISOTACHOPHORESIS
Authors: Kiso Yoshiyuki , Hirokawa Takeshi
Published: July 2006

Dissociation constants of formic, acetic, butyric, caproic, succinic, and glutaric acids were obtained together with absolute mobilities by means of isotachophoresis. It was found that the obtained values agreed satisfactorily with those in literature and the present method was very useful for the mixed samples.
ACID-BASE PROPERTIES OF ALKALI PROMOTED CHROMIA-ALUMINA CATALYSTS
Authors: Damon Jean P , Scokart Paul O
Published: July 2006

Infrared study of pyridine and pyrrole adsorption and catalytic activity measurements have shown that alkali promotors eliminate the Lewis acidity, increase the strength of the surface basic sites and increase the dehydrogenation/dehydration activity ratio of Cr2O3–Al2O3 catalysts in the following sequence: Li,Na,K,Rb,Cs. Dissolution experiments indicate that these effects originate from the formation of a superficial chromate phase.
ION-PAIR EXTRACTION-TITRATION OF INORGANIC IONS WITH ONE PHASE END-POINT CHANGE SYSTEM. DETERMINATION OF COPPER AND PERCHLORATE ION
Authors: Tsubouchi Masahiro , Yamamoto Yuroku
Published: July 2006

A new titration method is proposed for the determination of inorganic ions such as copper(I) and perchlorate ion. It is based on the solvent extraction-titration with the change of indicator in only one phase without movement of the indicator from one phase to the other. Tetrabromophenolphthalein ethyl ester and 2,6-dichlorophenolindophenol are used as the indicator.
A NOVEL SYNTHESIS OF VICINALLY N,S-DISUBSTITUTED OLEFINS FROM LITHIO SULFENYLTRIMETHYLSILYLMETHANE AND AMIDE
Authors: Agawa Toshio , Ishikawa Minori , Komatsu Mitsuo , Ohshiro Yoshiki
Published: July 2006

Vicinally N,S-disubstituted olefins are synthesized in good yields from amides by treating with lithio sulfenyltrimethylsilylmethanes.
PATERNO–BÜCHI REACTION OF ACID ANHYDRIDE OXETANES FROM GLUTARIC ANHYDRIDE
Authors: Maruyama Kazuhiro , Ogawa Takuji , Kubo Yasuo
Published: July 2006

Glutaric anhydride underwent the Paterno–Büchi reaction with olefins and gave oxetanes in good yields. The quantum yield was 0.16. Acetic anhydride didn’t undergo this reaction contrarily.
SYNTHETIC STUDIES ON TROPONIN I ACTIVE SITE. PREPARATION OF A PENTADECAPEPTIDE WITH INHIBITORY ACTIVITY TOWARD ACTOMYOSIN ADENOSINE TRIPHOSPHATASE
Authors: Nozaki Sukekatsu , Kobayashi Keiko , Katayama Eisaku , Muramatsu Ichiro
Published: July 2006

Three peptides corresponding to the partial sequences of troponin I (positions at 101 – 109, 110 – 115, and 101 – 115) were synthesized in a combination of the ‘hold-in-solution’ method and the usual liquid phase method. The synthesized pentadecapeptide inhibits actomyosin ATPase in an about 30% activity of the intact troponin I on a molar basis.
MICHAEL ADDITIONS CATALYZED BY NICKEL(II) OR COBALT(II)ACETATE-2,2′-BIPYRIDINE COMPLEXES
Authors: Irie Kazuo , Miyazu Ken-ichi , Watanabe Ken-ichi
Published: July 2006

In the presence of nickel(II) or cobalt(II)acetate-2,2′-bipyridine complexes, α,β-unsaturated ketones, methyl acrylate, and acrylonitrile were found to react with nitromethane, malononitrile, and aniline at room temperature under neutral condition to afford addition products in good yields.
PHOTOCHEMICAL CYCLIZATION OF ACRYLIMIDE DERIVATIVES
Authors: Maruyama Kazuhiro , Ishitoku Takeshi
Published: July 2006

Upon irradiation N-methylmethacrylimide (1a) cyclized to give cis-1,3,5-trimethyl-3-azabicyclo[3.2.0]heptane-2,4-dione (2a) in a yield of 66%. 2a gave 1,2-dimethylcyclobutane-cis-1,2-dicarboxylic acid by alkaline hydrolysis. Several other acrylimide derivatives were found to give similar results upon irradiation.
SYNTHESIS AND PROPERTIES OF [3.3](2,5)FURANO(2,5)THIOPHENOPHANE AND [3.3](2,5)THIOPHENOPHANE
Authors: Miyahara Yuji , Inazu Takahiko , Yoshino Tamotsu
Published: July 2006

The title compounds have been synthesized via a route involving cyclization of 4,4′-(2,5-furandiyl)bis(1-bromo-2-butanone) with sodium sulfide followed by condensation with glyoxal to give 1,11-dioxo[3.3](2,5)furano(2,5)thiophenophane, a new intramolecular CT complex. A solution of [3.3](2,5)thiophenophane contains anti and syn conformers in a ratio of ca. 20:1 as shown by a VT-NMR study.
A NOVEL SYNTHESIS OF A CYCLOPENTANE RING FROM HOMOPYRONE DERIVATIVES
Authors: Yamaoka Hiroshi , Mishima Ikuhiro , Hanafusa Terukiyo
Published: July 2006

2-Acylcyclopent-3-en-1-ol derivatives, 2, were synthesized by the reaction of homopyrones with phenyllithium. The intermediate may be a cyclopropylmethanol derivative, 3, which was isomerized into 2. Similar treatment with methyllithium, methylmagnesium iodide, or lithium aluminium hydride also gave 2.
REACTION OF TRIALKYLBORANE WITH 1-ALKYNE AND LEAD(IV) ACETATE. A NEW REGIOSPECIFIC AND STEREOSPECIFIC ONE-POT SYNTHESIS OF ENOL ACETATES
Authors: Masuda Yuzuru , Hoshi Masayuki , Arase Akira
Published: July 2006

In the reaction of trialkylborane with 1-alkyne and lead(IV) acetate in hexane, one of the alkyl groups of trialkylborane migrated to the terminal carbon atom of the triple bond, giving regiospecifically an internal enol acetate and an internal alkyne as the main reaction products. The former compound had (Z)-configuration.
THE TRANSITION METAL-CATALYZED N-ALKYLATION AND N-HETEROCYCLIZATION. A REDUCTIVE TRANSFORMATION OF NITROBENZENE INTO N,N-DIALKYLANILINE AND 2,3-SUBSTITUTED QUINOLINE USING ALDEHYDE AND CARBON MONOXIDE
Authors: Watanabe Yoshihisa , Suzuki Naoki , Shim Sang Chul , Yamamoto Michihiro , Mitsudo Take-aki , Takegami Yoshinobu
Published: July 2006

The catalytic N-alkylation and N-heterocyclization of nitrobenzene occurs at 180°C under pressures of carbon monoxide(70 atm) in the presence of aldehyde and transition metal complexes to give 2,3-dialkyl quinoline and N,N-dialkylaniline in good yields. The product selectivity highly depends on the catalysts.
MICROWAVE SPECTRA OF METHYLSILYLSULFIDE
Authors: Shiki Yoshiko , Ohta Tomoyuki , Nakagawa Jun , Hayashi Michiro
Published: July 2006

Microwave spectra of methylsilylsulfide and its deuterated species were measured. A plausible structure was estimated from the observed rotational constants. Dipole moments were determined by Stark effect measurements of the two species. From the observed A–E splittings of the spectra, the barrier to methyl internal rotation was determined.
ENANTIOFACE-DIFFERENTIATING 1,4-ADDITION OF METHYL GRIGNARD REAGENT TO 1,3-DIPHENYL-2-PROPEN-1-ONE
Authors: Imamoto Tsuneo , Mukaiyama Teruaki
Published: July 2006

A good optical yield (68%) was achieved in the title reaction in the presence of (S)-1-methyl-2-hydroxymethylpyrrolidine as the chiral ligand.
ELECTROLYTIC BEHAVIOR OF ACETYLACETONE AT LEAD DIOXIDE ELECTRODE IN AQUEOUS SOLUTION
Authors: Fujinaga Taitiro , Yoshimura Tadayosi
Published: July 2006

By using electro-deposited lead dioxide (PbO2) electrode as an indicator, the electrode reaction of acetylacetone in aqueous solution was investigated. In conclusion, it was found that in the cathodic process electrode lead dioxide is reduced to lead ion which reacts with acetylacetone to form the complex and in the anodic process the lead complex is oxidized again and deposited onto the electrode as lead dioxide.
AN ASYMMETRIC SYNTHESIS OF β-FORMYL β-HYDROXY ESTERS
Authors: Sakito Yoji , Asami Masatoshi , Mukaiyama Teruaki
Published: July 2006

Optically active β-formyl β-hydroxy esters are prepared in high enantiomeric excess by treating 2-acyl-1,3-diazabicyclo[3.3.0]octane derivatives, prepared from (S)-2-(substituted aminomethyl)pyrrolidine and phenylglyoxal monohydrate or methyl hydroxymethoxyacetate, with metal enolates of ethyl acetate.
HYDROGEN-DEUTERIUM EXCHANGE KINETICS IN A TRIPLE-HELICAL POLYNUCLEOTIDE
Authors: Hayashi Yuzuru , Nakanishi Mamoru , Tsuboi Masamichi
Published: July 2006

The kinetics of the hydrogen–deuterium exchange reaction has been followed by stopped flow ultraviolet absorption spectroscopy of a triple-helical polynucleotide, composed of 1 mole polyriboadenylic acid and 2 moles of polyribouridylic acid, poly(rU) ·poly(rA) ·poly(rU).
FLOW INJECTION ANALYSIS OF INORGANIC ORTHO- AND POLYPHOSPHATES USING ASCORBIC ACID AS A REDUCTANT OF MOLYBDOPHOSPHATE
Authors: Hirai Yukio , Yoza Norimasa , Ohashi Shigeru
Published: July 2006

A spectrophotometric method based on the formation of heteropoly blue complex was applied to the flow injection analysis of inorganic ortho-and polyphosphates such as diphosphate and triphosphate. Ascorbic acid was used to reduce molybdophosphate. Total amounts of inorganic ortho-and polyphosphates could be determined at a sampling rate of 45 samples/h with a relative standard deviation of less than 1%.
A NEW METHOD FOR THE PREPARATION OF SYMMETRICAL AROMATIC KETONES FROM AROMATIC CARBOXYLIC ACIDS
Authors: Goto Toshio , Onaka Makoto , Mukaiyama Teruaki
Published: July 2006

Treatment of S-(2-pyridyl) aromatic thioates, readily derived from aromatic carboxylic acids, with bis(1,5-cyclooctadiene)nickel [Ni(COD)2] under mild conditions afforded symmetrical aromatic ketones in good yields.
ELECTRON SPIN RESONANCE OF [Co2(CO)6(PBu3n)2](

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Authors: Hayashida Shigeru , Kawamura Takashi , Yonezawa Teijiro
Published: July 2006

Exposure of a frozen 2-methyltetrahydrofuran solution of Co2(CO)6(PBu3n)2 to 60Co γ-rays at 77 K gives its anion radical, whose ESR spectrum revealed that the odd electron occupies the orbital mainly of the Co–Co σ* character together with the Co–P σ* character; the orbital consists of 63–65 % cobalt and 23 % phosphorus atomic orbitals.
THERMAL TRANSITION OF DIMERIC TRIS(2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATO)TERBIUM(III)
Authors: Amano Ryohei , Sato Akiko , Suzuki Shin
Published: July 2006

The crystal structure of the title compound was found to change thermally from a monoclinic dimer to an orthorhombic monomer at 147 °C. The transition enthalpy and temperature were determined from differential scanning calorimetric measurements.
BUTADIENE YIELDS IN THE REACTIONS OF BUTENES OVER BINARY LIQUID ALLOY CATALYSTS CONTAINING K OR Na
Authors: Honda Kazuaki , Takahashi Katsumi , Ogino Yoshisada
Published: July 2006

Three liquid alloy catalysts, K–In, K–Pb and Na–Pb, are active for the dehydrogenation of butenes, giving 1,3-butadiene. These catalysts are also active for isomerization and decomposition but an appropriate choice concerning the catalyst, the reactant butene and the reactant partial pressure minimizes the decomposition and improves the reactant recovery.
SYNTHESIS OF 7-CYANO-7-DEAZAGUANINE, ONE OF THE NUCLEOSIDE Q (QUEUOSINE) PRECURSORS FOR THE POST-TRANSCRIPTIONAL MODIFICATION OF tRNA
Authors: Kondo Tadao , Nakatsuka Shin-ichi , Goto Toshio
Published: July 2006

7-Cyano-7-deazaguanine, which is one of the precursors of nucleoside Q (queuosine) biosynthesis, was synthesized from 2-methylthio-6-methoxy-7-methyl-7-deazapurine; methoxymethyl protecting group at 9 position could be removed by transformation to acetoxymethyl group followed by hydrolysis with aq. ammonia.
CF2(1B1) FORMATION BY VACUUM ULTRAVIOLET PHOTOLYSIS OF C2F4
Authors: Koda Seiichiro
Published: July 2006

An emission due to the 1B1 \ightharpoonup 1A1 transition of CF2 radical was observed during the vacuum ultraviolet photolysis of tetrafluoroethylene with Xe and Kr resonance lamps. The extent of vibrational excitation of the CF2(1B1) evidenced that the dissociation process C2F4 + hν \ightharpoonup CF2(1A1) + CF2(1B1) is responsible.
SYNTHESIS OF CYCLIC AMINIMINES WITH PERFLUOROALKYL GROUPS
Authors: Ikeda Isao , Tsukamoto Takeo , Okahara Mitsuo
Published: July 2006

Reaction of perfluoro-2-methyl-2-pentene (1) with 1,1-dimethylhydrazine gave novel type cyclic aminimines, pyrazolium aminimines, and the reaction scheme was discussed.
EFFECT OF ALKYL CHAIN LENGTH OF STATIONARY PHASE ON RETENTION AND SELECTIVITY IN REVERSED PHASE LIQUID CHROMATOGRAPHY
Authors: Tanaka Nobuo , Sakagami Keiko , Araki Mikio
Published: July 2006

Effect of alkyl chain length of stationary phase on retention and selectivity of various hydrocarbons was found to be strongly dependent on the type of organic solvents in mobile phase in reversed phase liquid chromatography. The results suggest the participation of methanol in the retention of polynuclear aromatic hydrocarbons in stationary phase having long alkyl chains.
REVELATION OF PENTACYCLO (6.2.1.02,7.04,10.05,9) UNDECANE \ightleftharpoons OXA-BIRD CAGE EQUILIBRIUM BY 13CMR SPECTROSCOPY: FRAGMENTATION OF CAGED POLYCYCLIC SYSTEMS WITH LEAD TETRAACETATE
Authors: Mehta Goverdhan , Singh Vishwakarma , Pandey Paras N , Chaudhury B , Duddeck Helmut
Published: July 2006

13Cmr evidence is presented to show the existence of pentacyclo (6.2.1.02,7.04,10.05,9) undecane \ightleftharpoons oxa bird cage equilibrium in the parent system 1a. Preparation of some interesting polycyclic compounds via the lead tetracetate fragmentation of polycyclic ketones 1a, 1b and 10 is described.
RAPID MEDIUM CHANGE: A NEW METHOD FOR THE DETERMINATION OF BARRIERS TO ROTATION
Authors: Nakamura Mikio , Nakamura Nobuo , Oki Michinori
Published: July 2006

A new method for the determination of barriers to rotation, which consists of rapid mixing of a solution with a solvent of different polarity and observing the subsequent relaxation process to a new equilibrium, is developed.
ESR SPECTRA AND STRUCTURE OF RADICAL ANIONS OF METHYL DERIVATIVES OF STANNANE
Authors: Hasegawa Akinori , Yamaguchi Takatoshi , Hayashi Michiro
Published: July 2006

ESR spectra of (CH3)xSnH4−x− (x=0∼3) radical anions formed in TMS matrices were observed. These radical anions have trigonal bipyramidal structure and the methyl groups prefer the equatorial positions to the axial positions of the trigonal bipyramid.
A NOVEL ELECTROSYNTHESIS OF α,α-DIMETHOXYALKANOATES FROM α-(2-BENZOTHIAZOLYLTHIO)ALKANOATES
Authors: Torii Sigeru , Okumoto Hirosi , Tanaka Hideo
Published: July 2006

An efficient preparation of α,α-dimethoxyalkanoates (2) has been performed by electrolytic desulfurization of α-(2-benzothiazolylthio) alkanoates (1) in MeOH containing CuCl2 as a catalytic additive, yielding 2 (94–57%) together with disulfide 3 (88–48%).
NON-CONVENTIONAL NITRATION OF 2,5-DIMETHYLTH IOPHENE AND ITS 3,4-DIBROMO DERIVATIVE
Authors: Suzuki Hitomi , Hidaka Ichiro , Osuka Atsuhiro , Iwasa Akemi , Mishina Tadashi
Published: July 2006

Nitration of 2,5-dimethylthiophene with copper(II) nitrate in acetic anhydride gives 2,5-dimethyl-3-nitrothiophene and 3,2′-methylene (2,5-dimethylthiophene) (5′-methylthiophene) as major products. Treatment of 3,4-dibromo-2,5-dimethylthiophene with nitric acid (d = 1.5) in dichloromethane in the presence of a catalytic amount of sulfuric acid yields 3,4-dibromo-5-methyl-2-nitrooxymethylthiophene as the sole major product.
A DIRECT ARYLSELENENYLATION OF ENONES WITH DIARYL DISELENIDES BY A ELECTROREDUCTIVE PROCEDURE
Authors: Torii Sigeru , Inokuchi Tsutomu , Hasegawa Nobu
Published: July 2006

A new procedure for arylselenenylation of enones has been developed by electrolysis with diaryl diselenide and chlorotrimethylsilane in methanol. In the course of the reaction generation of aryl selenols in situ is assumed.
THE STEPWISE CONFORMATIONAL CHANGE OF POLY(l-LYSINE) IN AQUEOUS SOLUTION OF SODIUM 1-OCTANESULFONATE
Authors: Hayakawa Katumitu , Ohara Kazuto , Satake Iwao
Published: July 2006

The circular dichroism spectrum of poly(l-lysine)(PLL) in aqueous 1-octanesulfonate solution was measured as a function of surfactant concentration at varying temperatures and the conformational phase diagram was constructed. At temperatures above 10°C, the increase in surfactant concentration causes PLL to change stepwise from coil to β-form and from β-form to helical conformation, Upon lowering temperature, the surfactant concentration range, where PLL assumes β-form, becomes narrower and eventually disappears at around 10°C.
OXIDATIVE CLEAVAGE REACTION OF 3-METHYLINDOLE CATALYZED BY CuCl-PYRIDINE COMPLEX UNDER OXYGEN
Authors: Tsuji Jiro , Takayanagi Hiroshi
Published: July 2006

Oxidative cleavage reaction of 3-methylindole to give 2-formylaminoacetophenone in 70% yield was achieved by using CuCl-pyridine complex as a catalyst under oxygen.
LITHIUM IODIDE MEDIATED REGIOSELECTIVE COUPLING OF LITHIUM ACETYLIDES WITH ALLYLIC HALIDES
Authors: Yatagai Hidetaka , Yamamoto Yoshinori , Maruyama Kazuhiro
Published: July 2006

Regioselective coupling between lithium acetylides and allylic halides is realized by using lithium iodide as an additive.
BORON TRIFLUORIDE ETHERATE-CATALYZED BACKBONE REARRANGEMENT OF 3α,4α- AND 3β,4β-EPOXY-D:A-FRIEDO-18β,19αH-LUPANES
Authors: Yokoyama Yasushi , Moriyama Yoshihiko , Tsuyuki Takahiko , Takahashi Takeyoshi
Published: July 2006

Treatment of 3α,4α- and 3β,4β-epoxy-D:A-friedo-18β,19αH-lupanes with boron trifluoride etherate gave migrated lupane derivatives, D:B-friedo-18β,19αH-lup-5- and -5(10)-en-3-ols, 18β, 19αH-lup-12-en-3-ols, lup-18-en-3-ols, and lup-19-en-3-ols. D:B-Friedo-18β, 19αH-lup-1(10)-en-3α-ol and 3β, 10β-epoxy-D:B-friedo-18β, 19αH-lupane were also obtained from α- and β-epoxides, respectively. The reaction product ratios in the same reaction in various solvents are listed in Tables.
SODIUM HYDROXIDE-ACTIVATED CATALYST OF COLLOIDAL NICKEL BORIDE FOR ATMOSPHERIC HYDROGENATION OF KETONES AND ALDEHYDES
Authors: Nakao Yukimichi , Fujishige Shoei
Published: July 2006

Addition of sodium hydroxide to colloidal nickel boride in ethanol resulted in a marked enhancement of its catalytic activity for atmospheric hydrogenation of acetone at 30°C by a factor of more than 20. Other ketones and aldehydes with bulky substituents were smoothly hydrogenated by the activated colloidal catalyst.
TRIPHASE CATALYSIS OF POLYMER-BOUND AMINE OXIDE IN CYANIDE DISPLACEMENT ON 1-BROMOOCTANE
Authors: Maeda Hirokazu , Hayashi Yoshiyuki , Teramura Kazuhiro
Published: July 2006

Cross-linked polystyrene supported tertiary amines and amine oxides are found to be a very efficient catalyst for a nucleophilic substitution reaction. The amine oxide resin (MPE-5-AO) was one of the most effective and economical catalysts and can be used several times without the loss of the catalytic activity.
STEREOCONTROLLED SYNTHESIS OF 1′, 4′-DIALKYLATED PYRIMIDINE RIBO-C-NUCLEOSIDES
Authors: Sato Tsuneo , Watanabe Makoto , Noyori Ryoji
Published: July 2006

The first, stereocontrolled entry to 1′, 4′-dialkylated pyrimidine C-nucleosides is outlined.
ELECTROSTATIC AND HYDROPHOBIC EFFECTS OF 1-1 ELECTROLYTES ON THE REACTIONS BETWEEN CHLOROCOBALT(III) COMPLEXES AND MERCURY(II) IONS
Authors: Iida Masayasu , Yamatera Hideo
Published: July 2006

The Hg 2+-assisted aquation of cis-[CoCl(OH2)(phen)2]2+ was retarded by sodium methanesulfonate and benzenesulfonate(0.5–1.0 mol dm−3), while they accelerated a similar reaction of [CoCl(NH3)5]2+.The unusual retardation effect has been attributed to the hydrophobic interaction of the complex ion and the organic sulfonate ions.
ASYMMETRIC HYDROGENATION WITH CHIRAL PHOSPHINE LIGAND HAVING C-PPh2 BONDING DERIVED FROM d-GLUCOSE
Authors: Nakamura Yushin , Saito Setsuo , Morita Yutaka
Published: July 2006

Rh-complex of 6S-cyano-5R-diphenylphosphino-3R,4S-O-isopropylidene-2-oxa-bicyclo[3.2.0]heptane showed the relatively high enantioselectivity (S-configuration) in the hydrogenation of α-acetamidocinnamic acid, whereas Rh-complex of the 6S-aminomethyl compound, the reduction product of the former, gave the reversed enantioselectivity (R-configuration) in the reaction.
SYNTHESIS OF PENTA-N,O-ACETYL-Dl-VALIENAMINE AND ITS RELATED BRANCHED-CHAIN UNSATURATED AMINOCYCLITOLS AND CYCLITOLS
Authors: Ogawa Seiichiro , Toyokuni Tatsushi , Suami Tetsuo
Published: July 2006

Penta-N,O-acetyl-Dl-valienamine, and its related branched-chain unsaturated aminocyclitols and cyclitols were synthesized from the dibromides derived from tri-O-acetyl-Dl-(1,3/2)-4-methylene-5-cyclohexene-1,2,3-triol.
A CONVENIENT SYNTHESIS OF (TRICHLOROMETHYL)CHLOROSILANES
Authors: Matsumoto Hideyuki , Ohkawa Kazuhiro , Nakano Taichi , Nagai Yoichiro
Published: July 2006

In the presence of a catalytic amount of triphenylphosphine, 1,1,2,2-tetrachloro-1,2-dimethyldisilane reacted smoothly under mild conditions with carbon tetrachloride to produce (trichloromethyl) methyldichlorosilane 1 in good yield. (Trichloromethyl)dimethylchlorosilane was also readily prepared by the triphenylphosphine-promoted transfer of the trichloromethyl group from 1 to dimethyldichlorosilane.
PREPARATION OF PERALKYLCYCLOPENTASILANES, [R2Si]5
Authors: Watanabe Hamao , Muraoka Tsutomu , Kohara Yasuhiro , Nagai Yoichiro
Published: July 2006

Peralkylcyclopentasilanes [R2Si]5 (where R=Et, Pr, Bu and i-Bu) were prepared by the reactions of corresponding dialkyldichlorosilanes (R2SiCl2) with lithium.
SYNTHESIS AND STEREOCHEMISTRY OF 3,6-EPOXY-5-HYDROXY-5,6-DIHYDRO-β-IONOL, A NOVEL FLAVOR CONSTITUENT OF SUIFU TABACCO
Authors: Kato Tetsuya , Kondo Hisao , Kitano Yukishige , Hata Go , Takagi Yoshikazu
Published: July 2006

(±)-3,6-Epoxy-5-hydroxy-5,6-dihydro-3-ionol was synthesized from β-ionone via 3,6-dihydroxy-α-ionone and its structure including the relative configurations was established as (±)-2β,5β-epoxy-2α-[3α-hydroxy-1(E)-butenyl]-1β,3,3-trimethylcyclohexan-1α-ol by X-ray analysis.
METHYL VIOLOGEN REDUCTION WITH WATER SOLUBLE METALLO-PORPHYRINS BY VISIBLE LIGHT IRRADIATION AND HYDROGEN EVOLUTION FROM WATER BY HYDROGENASE
Authors: Okura Ichiro , Takeuchi Makoto , Kim-Thuan Nguyen
Published: July 2006

The formation of the cation radical of methyl viologen was established when an aqueous metallo-porphyrin, methyl viologen and reducing agent was irradiated by visible light, and the activities of photosensitizers were compared. When hydrogenase was added to the system, hydrogen evolution was observed.
CROSS-COUPLING OF TERTIARY ALKYL GRIGNARD REAGENTS WITH β-BROMOSTYRENE CATALYZED BY DICHLORO[1,1′-BIS(DIPHENYLPHOSPHINO)FERROCENE]NICKEL(II)
Authors: Hayashi Tamio , Konishi Mitsuo , Yokota Kan-ichi , Kumada Makoto
Published: July 2006

Dichloro[1,1′-bis(diphenylphosphino)ferrocene]nickel(II) was found to be an effective catalyst for the cross-coupling of tert-butylmagnesium chloride with β-bromostyrene to give β-tert-butylstyrene selectively.
EFFICIENT CATALYSIS OF HETEROPOLY ACID FOR ALCOHOLYSIS OF EPOXIDE
Authors: Izumi Yusuke , Hayashi Kyoji
Published: July 2006

Heteropoly acid (HPA) was found to catalyze the alcoholysis of epoxide more efficiently than the conventional acid catalysts such as sulfuric acid, perchloric acid and p-toluenesulfonic acid, at 45°C in the homogeneous liquid phase. The reason for the high catalytic activity of HPA is also discussed.
PRESSURE-INDUCED PHASE TRANSITION IN 2-METHYLADAMANTANE AND 2-BROMODAMANTANE
Authors: Hara Kimihiko , Katou Yoshikazu , Osugi Jiro , Taniguchi Yoshihiro , Suzuki Keizo
Published: July 2006

Pressure-induced phase transitions were found in 2-methyladamantane and 2-bromoadamantane by X-ray studies at high pressures. Their transition pressures were 9 kbar and 0.5 kbar, respectively. The crystal structures of the low-pressure phases for both compounds and the high pressure phase of 2-methyladamantane were determined.
SYNTHESES OF 4-ALKYLINDOLES FROM 2-METHYL-5-NITROISOQUINOLINIUM IODIDE
Authors: Somei Masanori , Karasawa Yoshio , Kaneko Chikara
Published: July 2006

4-[N-Acetyl-N-methyl]aminomethylindole was prepared economically on a large scale from 2-methyl-5-nitroisoquinolinium iodide. Subsequent alkaline hydrolysis afforded 4-methyiaminomethylindole. Starting from these two compounds, various 3,4-di- and 4-substituted indoles were prepared including 4-formylindole, 4-[N,N-disubstituted]aminomethylindoles, 4-alkylindoles, and benz[cd]indoles. A novel nucleophilic substitution reaction of gramine derivatives by the catalysis of tri-n-butylphosphine was also reported.
THERMAL REARRANGEMENT OF α,β-UNSATURATED SULFINE
Authors: Karakasa Takayuki , Ohmura Haruo , Motoki Shinichi
Published: July 2006

The thermolysis of 2-arylmethylene-1-tetralinthione-S-oxide gave 2-arylcarbonyl-1 -tetralinthione: it is considered that the reaction probably proceeded through the intramolecular 1,5-dipolar cycloaddition of the tetralinthione-S-oxide.
REGIOSELECTIVE SYNTHESIS OF D-RING SUBSTITUTED BENZ[a]ANTHRACENES BY ONE-POT PHOTOCHEMICAL REACTION
Authors: Maruyama Kazuhiro , Tojo Masahiro , Iwamoto Hidetoshi , Otsuki Tetsuo
Published: July 2006

Benz[a]anthracene-7,12-diones containing methoxy group on the 8-, 9-, 10-, and/or 11-positions(D-ring) were synthesized regioselectively by one-pot photochemical reaction of 2-bromo-3-methoxy-1,4-naphthoquinone derivatives with 1,1-diphenylethylene.
REACTION OF BIS(8-QUINOLINOLATO)NITROSYLCOBALT WITH NITROGEN OXIDE
Authors: Miki Eiichi
Published: July 2006

Reaction of [Co (C9H6NO)2(NO)] (C9H6NO− = 8-quinolinolate ion) with a large excess of nitrogen oxide in dichloromethane gives [NO][Co(C9H6NO)2(NO3)(NO2)] with liberation of dinitrogen oxide at room temperature. Investigations using nitrogen-15 labelled compounds suggest that the reaction is *NO−(coordinated) + 8NO → *NO2−(coordinated) + NO3−(coordinated) + 3N2O + NO+.
A NEW AND CONVENIENT ROUTE TO THE AMIDES OF α-AMINO ACIDS AND α-HYDROXY ACIDS BY MEANS OF THE PALLADIUM CATALYZED FACILE CLEAVAGE OF 3-SUBSTITUTED-4-ARYLAZETIDIN-2-ONES
Authors: Ojima Iwao , Suga Shigemi , Abe Rumiko
Published: July 2006

3-Substituted-4-arylazetidin-2-ones were found to be cleaved selectively at the N–C4 bond by the hydrogenolysis on palladium catalyst to give the corresponding amides of α-amino acids or α-hydroxy acids in excellent yields.
THE CHARACTERISTIC OF γ-MANGANESE DIOXIDE ELECTRODE IN ACIDIC SOLUTIONS IN THE PRESENCE OF COMPLEXANES
Authors: Fujinaga Taitiro , Yoshimura Tadayosi
Published: July 2006

By using γ-manganese dioxide (MnO2) as an indicator electrode, the electrode-reaction of ethylenediaminetetraacetic acid (EDTA) and other complexanes was investigated. A characteristic cathodic peak of manganese dioxide which increases in the presence of complexanes was observed.
PREPARATION OF OPTICALLY ACTIVE MER ISOMERS OF BIS(METHYLIMINODIACETATO)COBALTATE(III) AND (METHYLIMINODIACETATO)(DIETHYLENETRIAMINE)COBALT(III) IONS
Authors: Koine Norio , Tanigaki Teiichi , Hidaka Jinsai , Shimura Yoichi
Published: July 2006

The preparation and optical resolution of a new complex, mer-[Co(mida)2]− (mida = methyliminodiacetate) were achieved together with the optical resolution of mer-[Co(mida)(dien)]+ (dien = diethylenetriamine). The d→d absorption and circular dichroism spectra, and some properties of these complexes are reported.
REVISED STRUCTURE OF CERIFERIC ACID
Authors: Naya Yoko , Miyamoto Fumiko , Kishida Keiko , Kusumi Takenori , Kakisawa Hiroshi , Nakanishi Koji
Published: July 2006

The structure of ceriferic acid, a scale insect sesterterpene secretion, has been revised from 10 to 5. Naturally occurring ceriferol has been correlated with ceriferic acid.
NEW OXOMOLYBDENUM(V) COMPLEXES OF TETRAPHENYLPORPHINE WITH UNIVALENT LIGANDS
Authors: Imamura Taira , Terui Masashi , Takahashi Yasuo , Numatatsu Takayuki , Fujimoto Masatoshi
Published: July 2006

New tetraphenylporphine complexes of oxomolybdenum(V), MoO(tpp)X(X = NCS and Br), were synthesized, and characterized by means of IR, ESR, and electronic spectra. The formation of a hyperoxide complex, MoO(tpp)(O2), in dichloromethane was confirmed.
CONFORMATIONAL ANALYSIS WITH LANTHANIDE SHIFT REAGENTS DIFFERENCES IN THE SOLUTION AND CRYSTAL STRUCTURE CONFORMATIONS OF A COMPOUND
Authors: Ammon Herman L , Mazzocchi Paul H , Liu Leslie
Published: July 2006

The solid and LSR-determined solution conformations of 2-benzyl-3-oxo-6-exo-(2,6-diiodo-4-methylphenoxy)-2-azabicyclo[2.2.1]heptane are substantially different. The “best” solution conformation contains a close I···H contact of 2.65 Å, in agreement with trends in the 1H chemical shifts in several similar compounds. Crystal structure data may not provide an accurate picture of the major solution conformer in cases where interconversion barriers are low.
REDUCTIVE COUPLING OF S-(2-PYRIDYL) ALIPHATIC THIOATES BY USE OF BIS(1,5-CYCLOOCTADIENE)NICKEL
Authors: Onaka Makoto , Matsuoka Yoshio , Mukaiyama Teruaki
Published: July 2006

S-(2-Pyridyl) aliphatic thioates are reductively dimerized to give α-diketones and α-hydroxy ketones on treatment with bis(1,5-cyclooctadiene)nickel at 40°C.
A NEW REARRANGEMENT OF SPIRO-3H-PYRAZOLES
Authors: Mataka Shuntaro , Takahashi Kazufumi , Ohshima Takeshi , Tashiro Masashi
Published: July 2006

The thermally labile spiro-3H-pyrazoles obtained by the reaction of diazoindenothiophenes with dimethyl acetylenedicarboxylate rearranged into the corresponding 3H-pyrazoles which are formed via Van Alphen–Hüttel rearrangement followed by the migration of an ester group.
PHOTOLYTIC α-ELIMINATION OF ORGANIC HALIDES FROM ORGANOTELLURIUM(IV) HALIDES
Authors: Uemura Sakae , Fukuzawa Shin-ichi
Published: July 2006

Irradiation of organotellurium(IV) halides in benzene affords the corresponding organic halide by α-elimination, the carbon–halogen bond being formed at ipso-position and in some case retentively. The reaction is not affected by the presence or absence of oxygen and t-butoxy radical.
CYCLOADDITION REACTION OF A NEW PERIPHERAL AZOMETHINE YLID TO SYMMETRICALLY SUBSTITUTED OLEFIN
Authors: Kanemasa Shuji , Kobira Seigo , Kajigaeshi Shoji
Published: July 2006

An unusual azomethine ylid 1,3-dipole was generated on the periphery of pyrido[1,2,3-de]quinoxaline ring. This peripheral ylid, anhydro 3H-pyrido[1,2,3-de]quinoxalinium hydroxide, reacted stereoselectively with electron-deficient cis olefins such as dimethyl maleate and N-substituted maleimides giving endo [4+2] cycloadducts as single products. With such a trans olefin as dimethyl fumarate, a mixture of two kinds of the [4+2] cycloadducts, 1-exo-2-endo- and 1-endo-2-exo cycloadduct, was formed. These cyclo-addition reactions have possibly proceeded in a concerted manner.
VISIBLE LIGHT INDUCED ELECTRON TRANSFER REACTIONS OF METAL COMPLEXES. PRODUCTION OF HYDROGEN FROM WATER BY A Ru(bpy)32+–Fe4S4(SBzl)42− SYSTEM
Authors: Okuno Yohmei , Yonemitsu Osamu
Published: July 2006

Hydrogen is generated without addition of extra electron donor when aqueous solution of Ru(bpy)32+ and synthetic iron-sulfur complex, Fe4S4(SBzl)42−, is illuminated by a “sunlight lamp”. Result shows that the Fe–S chelate plays an important role, presumably as an electron carrier. Probable mechanism is also presented.
POLYMERIZATION OF ETHYL AND METHYL VINYL ETHERS CATALYZED BY IRON OXIDE TREATEI WITH SULFATE ION. SYNTHESIS OF STEREOSPECIFIC POLY. (METHYL VlNYL ETHER)
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

A solid catalyst which was prepared by exposing Fe(OH)3, obtained by hydrolyzing Fe(NO3)3 or FeCl3 with ammonia, to l N H2SO4 and then calcining in air at 500°C was highly active for the title reaction at 0 –−20°C. This catalyst produced poly (methyl vinyl ether) with the crystalline structure.
INTRAMOLECULAR INTERACTION BETWEEN METHOXYL AND ACYLOXYMETHYL GROUPS IN TRIPTYCENE SYSTEMS
Authors: Izumi Giichi , Yamamoto Gaku , Oki Michinori
Published: July 2006

Populations of conformers of 9-(2-acyloxyethyl)-1,4-dimethoxytriptycene suggest that there is an attractive interaction between the acyloxymethyl and the methoxyl groups. The effects of the electronegativities of the acyl group upon the distribution of conformers and the relation between the interaction and SN2 reactions are discussed.
REACTIONS OF SILYL-SUBSTITUTED CARBANIONS WITH NITRONES
Authors: Tsuge Otohiko , Sone Kazuhiro , Urano Satoshi
Published: July 2006

The reaction of carbanions, prepared from 2-(trimethylsilylmethyl)pyridine or N,N-dimethyltrimethylsilylacetamide and lithium diisopropylamide in tetrahydrofuran, with α-aryl-N-phenylnitrones afforded a mixture of the corresponding (E)-alkene, azobenzene and azoxybenzene, respectively. On the other hand, the carbanions reacted with cyclic nitrones to give the corresponding aziridine and/or hydroxylamine derivatives as major products.
ASYMMETRIC REDUCTION OF SIMPLE ACHIRAL KETONES WITH LITHIUM ALUMINUM HYDRIDE PARTIALLY DECOMPOSED BY (−)-N-METHYLEPHEDRINE AND N-ETHYLANILINE
Authors: Terashima Shiro , Tanno Norihiko , Koga Kenji
Published: July 2006

The title asymmetric reduction was found to give the corresponding optically active alcohols in high optical(max. 90% ee) and chemical(max. 100%) yields.
HYPERFINE SPLITTING CONSTANTS OF BIS(2,6-DIMETHYLARYL) NITROXIDES
Authors: Suehiro Tadashi , Masuda Seiichi , Motoyama Nobuyuki , Kamimori Mariko , Yoshida Masayuki , Tokumaru Katsumi
Published: July 2006

Bis(2,6-dimethylaryl) nitroxides showed ESR spectra of complex hyperfine structures and the coupling constants of the ring and the methyl hydrogen atoms were determined by a simulation technique. The coupling constants of the 4-ring and the 4-methyl hydrogen atoms of the aryl group, ca. 1.1 gauss, suggest a fairly great degree of conjugation between the aryl and the nitroxide group.
IMPROVEMENT OF DETECTION LIMIT IN UHF PLASMA TORCH EMISSION SPECTROMETRY
Authors: Shimizu Tokuo , Arita Hirotaka , Sakai Kaoru
Published: July 2006

To improve the detection limits in UHF plasma torch emission spectrometry, the flowthrough pattern of the sheath gas pinching the UHF plasma torch was modified. The plasma torch was pinched by inserting spacers between the inner and the outer wall of a double quartz tube holding the plasma torch, to raise the net intensities of the spectral lines and to depress the background intensities.
FUSION AND PHASE SEPARATION OF AMMONIUM BILAYER MEMBRANES
Authors: Shimomura Masatsugu , Kunitake Toyoki
Published: July 2006

The fusion process of separate aggregates and the phase separation in mixed membranes were demonstrated by using the blue shift of stacked azobenzene chromophores in the aqueous ammonium bilayer system.
A SUCCESSFUL PREPARATION OF 2-ARYL-2,3-DIHYDRO-2,3-IMINO-1,4-NAPHTHOQUINONES
Authors: Maruyama Kazuhiro , Ogawa Takuji
Published: July 2006

A new class of compounds, 2-aryl-2,3-dihydro-2,3-imino-1,4-naphthoquinones 3, was synthesized for the first time by heating 2-aryl-1,4-naphthoquinones with aryl azides. The yields were 30–50% when p-methoxyphenyl azide was used.
THE CATALYTIC EFFECT OF CARBIDE FORMATION DURING FISCHER–TROPSCH SYNTHESIS
Authors: Matsumoto Hiroshige
Published: July 2006

Fischer–Tropsch reaction on a fused iron catalyst has been investigated in both isothermal (250 °C) and temperature programmed (25–800 °C) experiments. With the increase in weight of the catalyst during the reaction, the period of catalyst activation decreased and the rate of hydrocarbon formation increased proportionally. Carburization during the reaction was observed to weaken the interaction between CO and Fe and to increase the amount of more weakly held carbon species which are considered to be available for the catalysis.
TERNARY INTERCALATION COMPOUND OF GRAPHITE WITH ALUMINUM FLUORIDE AND FLUORINE
Authors: Nakajima Tsuyoshi , Kawaguchi Masayuki , Watanabe Nobuatsu
Published: July 2006

Ternary intercalation compound of graphite with AlF3 and F2, CxF(AlF3)y was prepared under fluorine atmosphere at temperatures of 20–400 °C. Typical 1st stage compound has a composition of C6F(AlF3)0.15 with repeat distance 9.40 Å. Rapid progress in the reaction led to the formation of graphite fluoride, (C2F)n.
A NEW SYNTHESIS OF KETONES FROM 1,2-DIMETHOXYETHENYLLITHIUM, ORGANOBORANES, AND ALKYL FLUOROSULFONATES
Authors: Yogo Toshinobu , Koshino Junji , Suzuki Akira
Published: July 2006

The reaction of alkyl fluorosulfonates with lithium 1,2-dimethoxyethenyltrialkylborates readily prepared from organoboranes gives corresponding ketones in good yields.
DEUTERIUM ISOTOPE EFFECT IN 1H CHEMICAL SHIFT OF BENZENE-d1
Authors: Yonemitsu Tadashi , Kubo Kiyotaka
Published: July 2006

90 MHz 1H-NMR spectrum of liquid benzene-d1 has been measured and completely analysed as an AB2C2X (X=D,I=1) system. The deuterium isotopic shifts relative to internal benzene, ΔA=−1.4 ppb, ΔB=−1.3 ppb and ΔC=+0.3 ppb, have been determined.
A CONVENIENT SYNTHESIS OF PHENYL SELENOCYANATE
Authors: Tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

Treatment of benzeneselenenyl chloride with trimethylsilyl cyanide in various organic solvents provided phenyl selenocyanate in virtually quantitative yield. The reaction presents a very simple preparation of the useful selenenylation agent.
PREPARATION OF POLY(2,4-THIENYLENE) AND COMPARISON OF ITS OPTICAL AND ELECTRICAL PROPERTIES WITH THOSE OF POLY(2,5-THIENYLENE)
Authors: Yamamoto Takakazu , Sanechika Kenichi , Yamamoto Akio
Published: July 2006

Poly(2,4-thienylene) is prepared by Ni-catalyzed dehalogenation polymerization of 2,4-dibromothiophene with Mg. Comparison of chemical and physical properties of poly(2,4-thienylene) with those of Poly(2,5-thienylene) indicates that π-electrons of the latter polymer are delocalized along the polymer chain, whereas those of the former polymer are not. Poly(2,4-thienylene) is converted into a semiconductor by doping with SO3.
FOURIER TRANSFORM INFRARED PHOTOACOUSTIC SPECTROSCOPY OF SOLID SAMPLES
Authors: Teramae Norio , Hiroguchi Masayuki , Tanaka Shigeyuki
Published: July 2006

The Helmholtz resonance effect of the photoacoustic cell and the effect of the thermal properties of samples in the Fourier transform infrared photoacoustic spectroscopy have been discussed. Infrared photoacoustic spectra of several kinds of polymers have been measured without troublesome sample preparations.
7-(β-d-RIBOFURANOSYL)IMIDAZO[1,2-c]PYRROLO[2,3-d]PYRIMIDINE (= 1,N6-ETHENO-7-DEAZAADENOSINE). PROTONATION, QUATERNIZATION, AND FLUORESCENCE PROPERTIES
Authors: Inoue Yasuo , Kuramochi Takao , Imakubo Keiichi
Published: July 2006

Tendency of protonated 1,N6-ethenoadenosine to undergo deactivation of the fluorescence at 77 K is greatly decreased by the replacement of an N-1 nitrogen atom by a CH group. This phenomenon is discussed with reference to intramolecular proton transfer between N-1 and N-9 of the protonated 1,N6-ethenoadenosine in the excited state even at 77 K.
A COMPUTER PROGRAM FOR THE SIMULTANEOUS DETERMINATION OF THE FIRST-AND SECOND-ION-ASSOCIATION CONSTANTS. AN APPLICATION TO THE SYSTEM ACETYLACETONATOBIS(ETHYLENEDIAMINE)COBALT(III) AND CHLORIDE IONS IN DIMETHYLSULFOXIDE
Authors: Morimoto Yukiyoshi , Nakazawa Hiroshi , Sakaguchi Ushio , Yoneda Hayami
Published: July 2006

A computer program has been developed for the simultaneous determination of the first- and second-ion-association constants from spectroscopic(NMR, UV, or CD) or conductance measurements, and applied to the system, acetylacetonatobis(ethylenediamine)cobalt(III) and chloride ions in dimethylsulfoxide.
SELECTIVE FORMATION OF STYRENE AND HYDROGEN FROM ETHYLBENZENE OVER MoO3/MgO CATALYSTS
Authors: Imanaka Toshinobu , Katoh Yukihiro , Okamoto Yasuaki , Teranishi Shiichiro
Published: July 2006

The catalytic conversion of ethylbenzene into styrene and hydrogen has been studied over various supported molybdenum catalysts. MoO3/MgO catalysts exhibited remarkably high activity, selectivity, and resistivity against sulfur species even in the absence of additives. The relationships between the surface structure and the catalytic activity of the MoO3/MgO catalysts were also studied by XPS.
A PHENOLATE-BRIDGED BINUCLEAR COPPER(II) COMPLEX WITH SQUARE PYRAMIDAL STRUCTURE
Authors: Sakurai Takeshi , Narisako Katsuichiro , Nakahara Akitsugu
Published: July 2006

Two molecules of the copper(II) complex chelated with a tripod-like ligand, tris(2-benz[d]imidazolylmethyl)amine are bridged by p-chlorophenolate in acetone to form a binuclear copper(II) complex, in which two copper(II)’s varied from trigonal bipyramidal structure to square pyramidal one, losing anisotropic feature on ESR spectrum and exhibiting lowered magnetic moment of 1.7 B. M. (B. M.=9.274×10−24 A m2)
A NOVEL SYNTHESIS OF HALOKETENIMINE
Authors: Hirao Toshikazu , Hayashi Ken-ichiro , Motoyoshiya Jiro , Ohshiro Yoshiki , Agawa Toshio
Published: July 2006

Haloketenimines are prepared by treatment of 2,2-dihaloaziridines with triethylamine in acetonitrile.
DEHYDROGENATION OF ETHANOL OVER ZSM-5 TYPE ZEOLITES
Authors: Matsumura Yasuyuki , Hashimoto Keiji , Watanabe Shoji , Yoshida Satohiro
Published: July 2006

Decomposition of ethanol over ZSM-5 zeolite was investigated by use of a pulse microcatalytic reactor technique. Acetaldehyde and ethylene were formed over ZSM-5 and sodium enriched ZSM-5 was much more effective for the dehydrogenation than protonated one.
SYNTHESIS OF RUBY FILMS BY ANODIC OXIDATION OF ALUMINUM
Authors: Mita Ikuo , Yamada Midori
Published: July 2006

An alpha alumina film incorporated with chromium oxide was prepared on aluminum by two-step anodic oxidation. Aluminum was anodized in sulfuric acid and adsorbed chromate ions into the pores of the film. A chromate ions adsorbed alumina film was reanodized in bisulfate melt. The film thus prepared has optical properties similar to a ruby synthesized by the Verneuil method.
PHOTOINDUCED [2+2] CYCLOADDITION BETWEEN ARYL VINYL ETHER AND ALKYL VINYL ETHER VIA ELECTRON TRANSFER
Authors: Mizuno Kazuhiko , Ueda Hiroshi , Otsuji Yoshio
Published: July 2006

The [2+2] photocycloaddition between aryl vinyl ethers and alkyl vinyl ethers occurs upon irradiation of acetonitrile solutions in the presence of an electron acceptor such as 1,4-dicyanobenzene, giving predominantly cis head-to-head cycloadducts. The mechanistic features of this photoreaction are described.
KETENE-ANTHRACENE ADDUCT, A PRECURSOR OF SUBSTITUTED ACETYLENES
Authors: Tarnchompoo Bongkoch , Thebtaranonth Yodhathai , Utamapanya Suchada , Kasemsri Prapani
Published: July 2006

The ketene-anthracene adduct 1 serves as a good precursor in the synthesis of substituted acetylenes, in which the key step is the retro Diels–Alder reaction.
SELECTIVE METHANOL FORMATION FROM ATMOSPHERIC CO AND H2 OVER NOVEL PALLADIUM CATALYSTS
Authors: Kikuzono Yasuo , Kagami Setsuko , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

Novel palladium catalysts prepared from M2PdCl4(M=alkali metals) type complexes have been studied, which produce methanol selectively from CO–H2 mixture below atmospheric pressure.
AN INFRARED STUDY OF THE REDUCTION OF TRIPOTASSIUM DODECAMOLYBDOPHOSPHATE WITH HYDROGEN
Authors: Eguchi Koichi , Toyozawa Yuji , Furuta Keiichi , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

Quantitative ir spectroscopic studies showed that the reduction of K3PMo12O40 with H2 in the early stage proceeded by consuming two bridging oxygens per Keggin anion. The process was accompanied by the stoichiometric formation of Mo5+ according to the XPS measurements. It was suggested that terminal oxygens were removed after two oxygens per Keggin anion were taken off.