bluuebunny/crossref_metadata_2025 huggingface dataset:
ONE STEP SYNTHESIS OF A BULKY COMPOUND AND ITS ABILITY TO FORM INCLUSION CRYSTALS WITH SMALLER ORGANIC MOLECULES
Authors: Takemura Tetsuo , Kozawa Kozo , Uchida Tokiko , Mori Nobuo
Published: July 2006

The reaction of terephthalaldehyde with 1,4-bis(mercaptomethyl) benzene leads to a novel macrocyclic thioacetal (1) which specifically and strongly forms inclusion crystals with organic solvents. The X-ray crystallographic examination of 1-benzene (2:3) complex revealed that the crystal is a crystalline solvate containing the benzene molecules as part of its lattice.
DICHLORO-BIS(TRIFLUOROMETHANESULFONATO)TITANIUM(IV) AS AN EFFECTIVE PROMOTER IN THE CLAISEN ESTER CONDENSATION
Authors: Tanabe Yoo , Mukaiyama Teruaki
Published: July 2006

Inter- and intra-molecular condensation (the Claisen and the Dieckmann condensations) between ester functions have been effected by the combined use of dichloro-bis(trifluoromethanesulfonato)titanium(IV) and tertiary amine under mild conditions.
ABNORMAL OZONOLYSIS OF 1-METHYL-3-STYRYL[3.3]PARACYCLOPHANE TO AFFORD 1-ALKOXY-3-METHYL[3.3]PARACYCLOPHANE
Authors: Nishimura Jun , Okada Yukihiro , Nakajima Hidehiro , Hashimoto Kazumasa , Oku Akira
Published: July 2006

Ozonolysis of 1-methyl-3-styryl[3.3]paracyclophane in various alcohols, followed by the treatment with perchloric acid, produced the corresponding cyclophanyl ethers in 28.6–83.5% yields.
AN INFRARED SPECTROSCOPIC STUDY ON THE MECHANISM OF METHANOL FORMATION FROM CO AND H2 OVER ZIRCONIA
Authors: Abe Hiroshi , Maruya Ken-ichi , Domen Kazunari , Onishi Takaharu
Published: July 2006

Formate and methoxide species formed by the CO–H2 reaction over zirconia at 423–673 K were observed by IR method. Methoxide species were converted into formate ion while the conversion of formate ion into methoxide was accelarated when methoxide and formate species coadsorbed on the zirconia surface at 523 K. A mechanism of methanol formation was proposed.
THE CRYSTAL STRUCTURE OF BIS(DIMETHYLTRIMETHYLENETETRASELENAFULVALENIUM) PERRHENATE, (DMtTSF)2ReO4
Authors: Kikuchi Koichi , Yakushi Kyuya , Kuroda Haruo , Kobayashi Keiji , Honda Masako , Katayama Chuji , Tanaka Jiro
Published: July 2006

The crystal structure of (DMtTSF)2ReO4 (2 C11H12Se41⁄2+·ReO4−) was determined at room temperature. The structure is monoclinic, space group C2/c, with cell dimensions a=28.518(2), b=7.327(1), c=14.364(1) Å β=109.84(1)°, Z=4. The DMtTSF molecules stack along the b axis to form a zigzag column. The interstack contacts between Se atoms are shorter than those in (TMTSF)2X. These contacts indicate that (DMtTSF)2ReO4 has a higher two-dimensional character than (TMTSF)2X.
PULSE RADIOLYSIS STUDIES OF ELECTRON TRANSFER BETWEEN POLYMER AND ZWITTERIONIC VIOLOGEN RADICALS
Authors: Sakamoto Tetsuo , Ohsako Tatsuya , Matsuo Taku , Mulac William A , Meisel Dan
Published: July 2006

The reaction between viologen polymer radicals(PV\underset.+) and Ru(NH3)63+ via zwitterionic viologen as excellent mediator, has been studied using the pulse radiolysis technique. Kinetic analysis provided quantitative measurement of the rate of electron transfer between the viologen radicals of zwitterionic viologens and PV2+ and vice versa. These also allowed determination of the redox potential of the polymer system. Implications to the photochemical charge separation system are discussed.
THE REACTION OF TRIMETHYLSTANNYLMETHYLLITHIUM WITH ELECTROPHILES
Authors: Murayama Eigoro , Kikuchi Toshihiro , Sasaki Kotaro , Sootome Norio , Sato Tadashi
Published: July 2006

Trimethylstannylmethyllithium was found to be a versatile reagent for the preparation of 1-alkenes from carbonyl compounds, allyl alcohols from α-chloro ketones, and cyclopropanes from oxiranes.
PHOTO-INDUCED HIGHLY SELECTIVE OLEFIN-MIGRATION OF N-(2- OR 3-PHENYLALLYL) AROMATIC IMIDES
Authors: Kubo Yasuo , Araki Takeo , Maruyama Kazuhiro
Published: July 2006

A Highly selective migration of double bond was observed on irradiation of N-(2- or 3-phenylallyl) aromatic imides in acetonitrile to afford N-(2- or 3-phenyl-1-propenyl) aromatic imides. The reaction seems to proceed via photochemical intramolecular one electron transfer from the double bond to the imide moiety.
COORDINATIVE ADDITION REACTIONS OF TERTIARY PHOSPHINES TO BISPHOSPHINE- AND BISPHOSPHITEPALLADIUM(O) COMPLEXES. FORMATION OF FOURCOORDINATE PALLADIUM(O) SPECIES WITH C3v-SYMMETRY
Authors: Urata Hisao , Tsukui Tatsuyuki , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Low-temperature 31P-NMR studies of the coordinative additions of tertiary phosphines, Ph2MeP and Et3P, to twocoordinate palladium(O) complexes, (Ph3P)2Pd(O) and [(PhO)3P]2pd(O), in toluene-d8 show the formation of fourcoordinate complexes with C3v-symmetry, (Ph2MeP)3(Ph3P)Pd and (Et3P)[(PhO)3P]3Pd, respectively.
NOVEL CONVERSION OF AROMATIC THIOAMIDES AND ALDEHYDES INTO NITRILES WITH ELEMENTAL SULFUR AND SODIUM NITRITE IN LIQUID AMMONIA
Authors: Sato Ryu , Itoh Kaoru , Itoh Kazumi , Nishina Hironori , Goto Takehiko , Saito Minoru
Published: July 2006

Various aromatic nitriles were obtained from aromatic thioamides, aldehydes, and the related compounds with elemental sulfur and sodium nitrite in liquid ammonia in good yields. A new type of the Willgerodt–Kindler reaction is suggested in this study.
COPPER(I)-INDUCED RADICAL CYCLIZATION OF DIETHYL o-(ALLYLOXY)PHENYLMALONATES TO CHROMAN DERIVATIVES
Authors: Setsune Jun-ichiro , Ueda Takashi , Matsukawa Kimihiro , Kitao Teijiro
Published: July 2006

The reaction of o-(allyloxy)bromobenzenes with copper(I) diethyl malonate afforded diethyl o-(allyloxy)phenylmalonates which under the reaction conditions cyclized to give 4,4-bis(ethoxycarbonyl)-3-methylchromans, 4,4-bis(ethoxycarbonyl)-3-methylenechromans, and 3-(3-butenyl)-4,4-bis(ethoxycarbonyl)chromans.
MICHAEL ADDITION-PETERSON OLEFINATION SEQUENCE OF METHYL 2-(TRIMETHYLSILYL)ACRYLATE AS A CONVENIENT METHOD FOR CONSECUTIVE FORMATION OF CARBON-CARBON SINGLE AND DOUBLE BONDS
Authors: Tsuge Otohiko , Kanemasa Shuji , Ninomiya Yusuke
Published: July 2006

A convenient method for the consecutive formation of carbon–carbon single and double bonds is presented with the example of the Peterson olefination of the carbanions resulted from the Michael addition of organometallics to methyl 2-(trimethylsilyl)acrylate.
CRYSTAL STRUCTURE OF TbIG IN VARIATION OF TEMPERATURE (298, 150 K) AND MAGNETIC FIELD (H=0, 0.1 T)
Authors: Konno Michiko , Mikami-Kido Mami
Published: July 2006

Temperature and magnetic field dependences of crystal structure of TbIG were investigated by X-ray diffraction. Corrections for primary and secondary extinction were made. It was found that temperature variation significantly affects the spherical domain, size r, whereas magnetic field affects the mosaic spread η.
UNUSUAL SUBSTITUTION REACTION OF 5-ALKYL-6,8-DIOXABICYCLO[3.2.1]OCTANES BEARING 3-SULFUR-CONTAINING SUBSTITUENTS WITH MERCAPTANS
Authors: Masaki Yukio , Serizawa Yuzuru , Nagata Kinnosuke , Kaji Kenji
Published: July 2006

5-Alkyl-6,8-dioxabicyclo[3.2.l]octanes with sulfur-containing substituents at the C(3)-position were found to undergo an unusual substitution reaction with mercaptans in the presence of the Lewis acids providing the corresponding 3-sulfenyl derivatives.
EFFECT OF POSITION OF ELECTRON-DONATING SIDEARM OF 16-CROWN-5 ON COMPLEXATION TOWARD Na+ AND K+
Authors: Nakatsuji Yohji , Yonetani Masayuki , Okahara Mitsuo
Published: July 2006

Several 16-crown-5 derivatives having an electron-donating sidearm were newly prepared and their stability constants toward Na+ and K+ were measured. The difference in the position of the sidearm was disclosed to change remarkably the complexation property of such type of compounds.
THE YLID ROUTE TO FLUORODIENES
Authors: Kondo Kazumi , Cottens Sylvain , Schlosser Manfred
Published: July 2006

The readily accessible 2-fluoro-2-alkenals react with phosphorus ylids at approximately the same rate and leading to nearly the same (Z/E)-mixtures of products as the corresponding halogen-free aldehydes do. Thus, the Wittig reaction allows to prepare a great variety of 2-fluorodienes with high yields.
PALLADIUM-CATALYZED SYNTHESIS OF 2,3-DISUBSTITUTED ALLYLAMINES BY REGIOSELECTIVE AMINOPHENYLATION OR AMINOALKENYLATION OF 1,2-DIENES
Authors: Shimizu Isao , Tsuji Jiro
Published: July 2006

Reaction of 1,2-dienes, phenyl iodide or alkenyl bromides, and secondary amines in the presence of palladium-phosphine catalyst affords 2-phenyl or alkenyl allylic amines.
t-BUTYL 2-PYRIDYL CARBONATE. A USEFUL REAGENT FOR t-BUTOXYCARBONYLATION OF AMINO ACIDS
Authors: Kim Sunggak , Lee Jae In
Published: July 2006

t-Butyl 2-pyridyl carbonate, a stable crystalline compound, is found to be very effective in the t-butoxycarbonylation of amino acids.
ASYMMETRIC REDUCTION OF PROCHIRAL CYCLIC KETONES WITH LITHIUM ALUMINUM HYDRIDE PARTIALLY DECOMPOSED BY (1R,2S)-(−)-N-METHYLEPHEDRINE AND 2-ALKYLAMINOPYRIDINE
Authors: Kawasaki Motoji , Suzuki Yasutaka , Terashima Shiro
Published: July 2006

The title chiral hydride was found to reduce prochiral cyclic ketones, affording the corresponding optically active cyclic alcohols in high optical(max. 9 8%ee) yields.
REDOX BEHAVIOR OF METHYLVIOLOGEN CATION RADICAL INCORPORATED INTO A HYDROPHOBIC ORGANIC PHASE BY LIPOPHILIC STABLE ANIONS
Authors: Takuma Keisuke , Sonoda Takaaki , Kobayashi Hiroshi
Published: July 2006

Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB−) could incorporate methylviologen radical cation (MV+·) and dication (MV2+) into hydrophobic organic solvent, while 2-hydroxy-3,5-ditert-butylbenzenesulfonate (HBBS−) could hold only the radical cation in the organic solvent. MV+· incorporated with TFPB− could easily transfer the electron to an acceptor at the interface between the organic and aqueous phases, and played the role of an efficient catalytic electron mediator across an organic liquid membrane.
CROSS TYPE OF DIENE-TRANSMISSIVE DIELS–ALDER REACTION
Authors: Tsuge Otohiko , Kanemasa Shuji , Sakoh Hirohiko , Wada Eiji
Published: July 2006

The first example of cross type of diene–transmissive Diels-Alder reaction is presented by the reactions of an activated cross-conjugated triene, 3-(methoxymethylene)-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, with cyclic olefins as the first dienophiles and then with acetylenes as the second.
THE SMILES REARRANGEMENT OF 4-NITROPHENYL N-HYDROXYCARBAMATE: THE INVOLVEMENT OF A SPIRO MEISENHEIMER COMPLEX OF AMONONITROBENZENE DERIVATIVE AS A TRANSIENT REACTION INTERMEDIATE
Authors: Fitzgerald Leonard R , Blakeley Robert L , Zerner Burt
Published: July 2006

In alkaline solution, 4-nitrophenyl N-hydroxycarbamate undergoes reaction by elimination to yield 4-nitrophenoxide ion, and by rearrangement to yield N-carboxy-4-nitrophenoxyamine. The effect of pH on the yield of the rearrangement product establishes that a transient spiro Meisenheimer complex is formed reversibly. Aromatization of this species occurs by two competing pH-independent reactions: one involves expulsion of a hydroxamate ion; the other involves the formation of a carbamate ion via a general base catalyzed collapse of the complex.
REGIOSELECTIVE SYNTHESIS OF 2,6-DICHLOROQUINOXALINE AND 2-CHLORO-6-IODOQUINOXALINE
Authors: Sakata Gozyo , Makino Kenzi
Published: July 2006

Facile regioselective synthesis of 2,6-dichloroquinoxaline and 2-chloro-6-iodoquinoxaline is described. Electrophilic substitution reaction of 2(1H)-quinoxalinone with chloride and iodide ion in 95% sulfuric acid occurred at 6-position exclusively.
14N NMR CHEMICAL SHIFT IMAGING
Authors: Kanazawa Yoko , Kamei Hirotake
Published: July 2006

The image of a phantom containing nitrogen compounds was obtained by 14N NMR method. The use of 14N chemical shift was successful in distinguishing the molecular species.
SURFACE ENHANCED RAMAN SCATTERING SPECTRA OF 2,2′-BIPYRIDINE ADSORBED ON AN Ag ELECTRODE FROM ITS KCl SOLUTION
Authors: Kim Munsok , Itoh Koichi
Published: July 2006

The surface enhanced Raman scattering (SERS) study indicates that 2,2′-bipyridine (bpy) molecules adsorb to an Ag electrode surface taking a nearly planar cis conformation. The potential-dependence of the interaction between the adsorbates and the Ag electrode was elucidated from the analysis of the spectra.
A STEREOSELECTIVE SYNTHESIS OF N-BENZOYL l-DAUNOSAMINE
Authors: Hiyama Tamejiro , Nishide Kiyoharu , Kobayashi Kazuhiro
Published: July 2006

Reaction of (2S,3S)-2,3-(cyclohexylidenedioxy)butanenitrile, derived from L(+)-tartrate or (S)-lactate, with the magnesium enolate of t-butyl acetate gave the corresponding (Z)-β-amino acrylate derivative, which was in turn transformed into N benzoyl l-daunosamine by acetylation, stereoselective hydrogenation, acidic hydrolysis, benzoylation, lactonization, and finally by reduction.
SYNTHESIS AND COMPLEXING PROPERTIES OF NOVEL FERROCENE CROWN ETHERS
Authors: Czech Bronislaw , Czech Anna , Kang Sang Ihn , Bartsch Richard A
Published: July 2006

Two novel ferrocene crown compounds in which the ferrocene nucleus bears one and two 18-crown-6 units are synthesized and their alkali metal cation complexation is examined in solvent extraction. The ferrocene biscrown exhibits selectivity for K+ and Rb+ in competitive extraction.
FORMATION OF AROMATIC HYDROCARBONS IN DEGRADATION OF POLYETHYLENE OVER ACTIVATED CARBON CATALYST
Authors: Uemichi Yoshio , Kashiwaya Yasunori , Ayame Akimi , Kanoh Hisao
Published: July 2006

Catalytic effects of activated carbon on the degradation of polyethylene were investigated. Activated carbon was highly effective for the formation of normal alkanes (C1–C5 fractions) and aromatics (C6–C8). Experimental results were explained in terms of high cracking and cyclization activities of the catalyst.
SYNTHESIS OF NEW MACROCYCLIC POLYETHER DI- OR TETRAESTER LIGANDS CONTAINING PYRAZOLE UNITS
Authors: Elguero J , Navarro P , Franco M I Rodriguez
Published: July 2006

A new series of macrocyclic polyether–diester compounds containing one or two pyrazole rings (NH or N-methyl substituted) have been prepared by treating 3,5-pyrazolyldicarbonyl chlorides with tetraethylene glycol in the presence of triethylamine. Their complexation abilities towards the shift reagent Eu(Fod)3 have been studied by 1H NMR in Cl3CD solution.
RESONANCE RAMAN SPECTRUM OF BIS[TRIS(TRIMETHYLSILYL)METHYL]DIPHOSPHENE
Authors: Hamaguchi Hiro-o , Tasumi Mitsuo , Yoshifuji Masaaki , Hashida Takashi , Inamoto Naoki
Published: July 2006

The resonance Raman spectrum of bis[tris(trimethylsilyl)methyl]diphosphene has been obtained using an ultraviolet laser line at 351.1 nm. From the observed overtone progression of the P=P stretching vibration, the harmonic frequency ωe and the anharmonic constant ωexe have been determined as 595 and 2 cm−1, respectively.
STEPWISE SEQUENCE OF DOUBLE DIELS–ALDER REACTION OF CROSS-CONJUGATED TRIENE EQUIVALENT
Authors: Tsuge Otohiko , Wada Eiji , Kanemasa Shuji , Sakoh Hirohiko
Published: July 2006

Alcohols with a 2-(1,3-butadienyl) substituent are readily available from the Grignard reaction of chloroprene and are important as cross-conjugated triene equivalents. Some examples of double Diels–Alder reaction of the alcohols are first reported.
ASYMMETRIC ACYLATION OF meso-1,2-DIOLS WITH d-KETOPINIC ACID CHLORIDE
Authors: Mukaiyama Teruaki , Tomioka Isao , Shimizu Makoto
Published: July 2006

Highly selective asymmetric acylation of meso-1,2-diols has been achieved using d-ketopinic acid chloride as acylating reagent.
ELECTROCHEMICAL ENANTIOMER-DIFFERENTIATING OXIDATION OF A RACEMIC ALCOHOL ON POLY(l-VALINE)-COATED ELECTRODES
Authors: Komori Tetsuo , Nonaka Tsutomu
Published: July 2006

It was found that the enantiomer-differentiating oxidation of racemic 2,2-dimethyl-1-phenyl-1-propanol (1) to the corresponding ketone (2) occurred on poly(l-valine)-coated electrodes. This reaction seemed to be the first example of electrochemical enantiomer-differentiating reaction and to be available for kinetic optical resolution: 43% optically-pure S-(−)-1 was recovered as an unreacted part, when a half amount of starting 1 was converted using a lead dioxide anode coated doubly with polypyrrole and poly(l-valine).
2-(TRIFLUOROMETHYL)ALLYLTRIMETHYLSILANE. A USEFUL BUILDING BLOCK FOR TRIFLUOROMETHYLATED ORGANIC MOLECULES
Authors: Yamazaki Takashi , Ishikawa Nobuo
Published: July 2006

2-(trifluoromethyl)allyltrimethylsilane, a new building block for the introduction of trifluoromethyl group was prepared by the Grignard reaction of ethyl trifluoroacetate with (trimethylsilyl)methylmagnesium chloride. This allylsilane underwent the reaction with aldehydes and ketones to give the adducts in good yields.
AN ELECTROCHEMICAL METHOD SPECIFICALLY DIRECTED TO THE PREPARATION OF Dl-BISABOLOL FROM Dl-NEROLIDOL
Authors: Uneyama Kenji , Masatsugu Yosinori , Ueda Takesi , Torii Sigeru
Published: July 2006

A product-selective electrosynthesis of dl-bisabolol from dl-nerolidol was accomplished by a constant current electrolysis in commercial acetone containing a small amount of LiClO4.
CYCLODIMERIZATION OF DIMETHYLMETHYLENESUCCINATE BY ALKYLALUMINUM COMPOUNDS
Authors: Yamaguchi Kazumi , Yokota Kazuaki , Takada Yoshiyuki
Published: July 2006

Cyclopentanone and bicyclic lactone derivatives have been prepared selectively by the reactions of dimethyl methylenesuccinate with alkylaluminum compounds. This reaction provides a new method for the preparation of lactones and cyclic ketones.
SYNTHESES, CHARACTERIZATIONS, AND KINETIC ASPECTS OF THIOCYANATO AND ISOTHIOCYANATO LINKAGE ISOMERS OF COBALT(III) COMPLEXES LIGATING AMINOPOLYCARBOXYLATES
Authors: Ogino Hiroshi , Isago Hiroaki
Published: July 2006

Two pairs of linkage isomers ([Co(SCN)(edta)]2− and [Co(NCS)(edta)]2−; [Co(SCN) (hedtra)]− and [Co(NCS) (hedtra)]−) were prepared. Where edta4− and hedtra3− denote ethylenediaminetetraacetate and N-hydroxyethylethylenediaminetriacetate, respectively. In aqueous solutions at room temperature, the N-bonded isomers were stable, while the S-bonded isomers were unstable : [Co(SCN)(edta)]2− gave [Co(edta)]−. [Co(SCN)(hedtra)]− gave both [Co(H2O)(hedtra)] and [Co(NCS)(hedtra)]−.
CORRELATIONS BETWEEN DISSOLVED ALKALINE PHOSPHATASE AND ORTHOPHOSPHATE IN LAKE WATER
Authors: Kobayashi Kensei , Hashimoto Shinya , Fujiwara Kitao , Haraguchi Hiroki , Fuwa Keiichiro , Otsuki Akira
Published: July 2006

Distinct negative correlation was found between the dissolved alkaline phosphatase activity and the orthophosphate concentration in Lake Kasumigaura (surface area, 171 km2) in the phosphorus-limited season. The decrease of the alkaline phosphatase activity induced by orthophosphate ions was observed at the level of 1 ng/mL of phosphorus, which is 3 orders of magnitude smaller than that in the laboratory scale experiment.
PHOTO-INDUCED HYDROGEN EVOLUTION IN THE PRESENCE OF NADPH AS AN ELECTRON DONATING AGENT
Authors: Okura Ichiro , Aono Shigetoshi , Kita Tatsuya
Published: July 2006

The cation radical of methylviologen was formed when an aqueous solution containing photosensitizer, methylviologen (MV2+), and NADPH was irradiated by visible light. On the addition of hydrogenase to the photo-irradiation system hydrogen evolution was observed.
PRACTICAL SYNTHESIS OF (+)-9(O)-METHANO-Δ6(9α)-PGI1. THE HIGHLY POTENT CARBON ANALOG OF PROSTACYCLIN
Authors: Sodeoka Mikiko , Shibasaki Masakatsu
Published: July 2006

A practical synthesis of (+)-9(O)-methano-Δ6(9α)-PGI1 potentially a useful therapeutic agent, has been accomplished by utilizing the intramolecular aldol condensation as a key step followed by the Wittig reaction and the regioselective hydrogenation.
DIASTEREOSELECTIVE REDUCTION OF PERFLUQROALKYLATED α,β-UNSATURATED KETONES WITH BAKER’S YEAST
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

The differentiation of a fluorinated group in the molecule with active fermenting yeast and the double asymmetric induction in some perfluoroalkylated α,β-unsaturated ketones are described.
PREPARATION AND REACTIONS OF DODECAMETHYL-3,4,7,8,11,12-HEXASILACYCLODODECA-1,5,9-TRIYNE
Authors: Sakurai Hideki , Eriyama Yuichi , Hosomi Akira , Nakadaira Yasuhiro , Kabuto Chizuko
Published: July 2006

Pyrolysis of the title silicon-containing cyclic triyne gave, by stepwise extrusion of dimethylsilylene, hexamethyltrisilacyclonona-1,4,7-triyne, which was further converted to a novel tris-bridged cyclophane. Fifteen-membered trioxahexasilatriyne, prepared by the oxidation of the title triyne, isomerized to the corresponding benzene derivative thermally.
THERMODYNAMIC PROPERTIES OF THE Nb–I SYSTEM
Authors: Hinode Hirohumi , Wakihara Masataka , Kamiya Shigeki , Saeki Masanobu , Taniguchi Masao
Published: July 2006

Equilibrium vapor pressures of Nb–I system were measured by using the Broudon’s gauge at temperatures between 293 and 1050 K. Considering the main gaseous species of the Nb–I system at high temperatures, the standard Gibbs’ energy functions, ΔG°=−21.0×103+10.1 T (T=850–1000 K), were calculated for the following reaction from both the partial pressures and material balance; Nb (s) + 2 I2 (g) \ightleftharpoons NbI4 (g).
HIGHLY SELECTIVE IONOPHORE FOR LITHIUM IONS. 14-CROWN-4 DERIVATIVE BEARING A LONG ALIPHATIC CHAIN
Authors: Kimura Keiichi , Kitazawa Sadaya , Shono Toshiyuki
Published: July 2006

The 14-crown-4 derivative, 3-dodecyl-3-methyl-1,5,8,12-tetraoxacyclotetradecane, has proved to be highly Li+-selective. In the ion-selective polymeric membrane electrode based on the crown ether was attained marked preference of Li+ over alkali and alkaline-earth metal ions, NH4+, and H+.
HIGH CATALYTIC ACTIVITIES OF SPECIALLY TREATED MgO and Na/MgO FOR DECOMPOSITION OF METHYL FORMATE
Authors: Ushikubo Takashi , Hattori Hideshi , Tanabe Kozo
Published: July 2006

The decomposition of methyl formate to methanol and carbon monoxide was carried out in gaseous phase at 50–300 °C over alkaline earth metal oxides, Na/MgO, Al2O3, SrO/Al2O3, K/active carbon, and 13X-molecular sieves. The MgO catalyst pretreated at 1000 °C exhibited a high activity, the selectivity being 100%. Addition of Na to MgO brought about a great increase in the activity, though a small amount of H2 formed.
A MICROBIAL SENSOR FOR URIC ACID
Authors: Kawashima Takuji , Tomida Kazuhiro , Tominaga Naotomo , Kobayashi Takekazu , Onishi Hiroshi
Published: July 2006

A microbial sensor for uric acid has been devised by coupling intact yeast cells (Pichia membranaefaciens 162300) with a carbon dioxide electrode. The resulting sensor has a markedly longer lifetime than the corresponding isolated enzyme sensor. The response slopes ranging from 37 to 42 mV per decade were obtained over the concentration range 1.0×10−4–2.5×10−3 mol dm−3 uric acid during the period 4–50 d.
SYNTHESIS OF OPTICALLY ACTIVE PROSTAGLANDIN ANALOGUE (8R,11S,12R,15S)-10-OXA-11-METHYL-11-DEOXY-PGE2
Authors: Nokami Junzo , Ono Toshio , Kajitani Yasunobu , Wakabayashi Shoji
Published: July 2006

The title compound has been synthesized via “three-component coupling process” which consisted of 1,4-addition of sulfonyl-carbanion to a butenolide and alkylation of the resulting enolate with propargylic iodide.
INSOLUBLE CATALYST FOR HEAT-GAIN IN A WATER-SOLUBLE SOLAR ENERGY STORAGE SYSTEM
Authors: Maruyama Kazuhiro , Tamiaki Hitoshi , Kawabata Shigeki
Published: July 2006

By action of insoluble catalysts, cobalt tetraphenylporphyrin or cobalt phthalocyanine adsorbed on activated carbon, water-soluble quadricyclane derivative was isomerized to norbornadiene derivative under release of heat in an alkaline solution. The activities of these insoluble catalysts were as high as those of water-soluble catalysts.
LASER-PHOTOLYSIS STUDY OF THE EXTERNAL MAGNETIC FIELD EFFECT ON THE DYNAMIC BEHAVIOR OF RADICAL PAIRS INVOLVING A GERMYL RADICAL
Authors: Hayashi Hisaharu , Sakaguchi Yoshio , Mochida Kunio
Published: July 2006

The yields of the escaping ketyl radicals from the radical pairs formed through the reactions of triethylgermane with the triplet states of acetophenone and xanthone were found to be increased by a magnetic field. The observed increases at 1 T were 3 and 27% for the ketyl radicals of acetophenone and xanthone, respectively.
PREPARATION PROCESS AND CATALYTIC ACTIVITY OF CsxH3−xPW12O40
Authors: Tatematsu Shin , Hibi Takuo , Okuhara Toshio , Misono Makoto
Published: July 2006

When H3PW12O40 solution was titrated with Cs2CO3 solution, Cs2PW12O40 was precipitated at the Cs/anion ratio of 0.5–2, while Cs3HPW12O40 was formed at the ratio of 3. Based on these results, the peculiar variation with x and heat-treatment observed for catalytic activity of CsxH3−xPW12O40 has been explained.
A CONVENIENT PREPARATION OF DIALKYL 3-(DIALKOXYPHOSPHINYL)-1-PROPENYL PHOSPHATE DERIVATIVES: ADDITION OF THE MIXED REAGENT TRIALKYL PHOSPHITE/DIALKYL PHOSPHOROCHLORIDATE TO α,β-UNSATURATED ALDEHYDE
Authors: Okamoto Yoshiki
Published: July 2006

The mixed reagent trialkyl phosphite/dialkyl phosphorochloridate reacts readily with α,β-unsaturated aldehydes to give dialkyl 3-(dialkoxyphosphinyl)-1-propenyl phosphate derivatives.
THE PLATINUM COMPLEX CATALYZED TRANSFORMATION OF PRIMARY AMINE TO SECONDARY AMINE
Authors: Tsuji Yasushi , Shida Jun , Takeuchi Ryo , Watanabe Yoshihisa
Published: July 2006

Platinum complex combined with SnCl2·2H2O activates a primary amine and catalyzes the transformation to the secondary amine at 180 °C. Dibutylamine was obtained from butylamine in 74% yield.
CHIRAL HYDRIDE REAGENTS CONTAINING (R/S)-2,2′-DIHYDROXY-6,6′-DIMETHYLBIPHENYL FOR REDUCTION OF ALKYL PHENYL KETONES
Authors: Suda Hiroshi , Kanoh Shigeyoshi , Umeda Nobuhiro , Ikka Masahiko , Motoi Masatoshi
Published: July 2006

Chiral hydride reagents for asymmetric reduction were prepared from LiAlH4, optically pure 2,2′-dihydroxy-6,6′-dimethylbiphenyl (1), and an achiral alcohol. They showed high enantioface discrimination in the reduction of prochiral alkyl phenyl ketones. The configuration of preferentially formed enantiomer always agreed with that of 1 used for the reagents. Further, polymeric reagents containing (R)-1 moiety were prepared and their behavior in the reduciton was described also.
TRANSFER OF ASYMMETRY BY THE PALLADIUM-CATALYZED ALKYLATION OF CHIRAL ALLYLIC SULFINATES
Authors: Hiroi Kunio , Kitayama Ryuichi , Sato Shuko
Published: July 2006

The palladium-catalyzed substitution of chiral allylic sulfinates was performed by the initial transformation of the sulfinates into allyl sulfones and the subsequent alkylation of the sulfones with retention of configuration. Reaction of trans- and cis-2-butenyl (S)-(−)-p-toluenesulfinate with the sodium salt of dimethyl malonate was undertaken in the presence of tetrakis(triphenylphosphine)palladium and triphenylphosphine to produce dimethyl (S)-(+)- and (R)-(−)-1-buten-3-ylmalonate, respectively, with the α-alkylated product, dimethyl 2-butenylmalonate.
RAMAN SPECTROSCOPIC STUDY OF NONIONIC SURFACTANTS. MOLECULAR CONFORMATIONS OF TRI- THROUGH OCTAETHYLENE GLYCOL MONODODECYL ETHERS IN THE SOLID STATE
Authors: Matsuura Hiroatsu , Fukuhara Koichi
Published: July 2006

Raman spectra of n-C12H25 (OCH2CH2)mOH with m=3–8 measured in the solid state. Molecular conformations of these surfactants were examined by utilizing normal coordinate treatment; the conformation of the oxyethylene chain is fundamentally identical with the helical structure of poly(oxyethylene).
BAND STRUCTURES OF TWO TYPES OF (BEDT-TTF)2I3
Authors: Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

On the basis of the extended Hückel molecular orbital calculation, the intermolecular overlaps of the highest occupied molecular orbitals are calculated for α-(BEDT-TTF)2I3 reported by Bender et al., and for superconducting β-(BEDT-TTF)2I3 reported by Yagubskii et al. (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene). α-(BEDT-TTF)2I3 is a two-dimensional semimetal or a narrow gap semiconductor. β-(BEDT-TTF)2I3 is a two-dimensional metal which has an almost isotropic closed Fermi surface.
REGIOSELECTIVE C–O BOND CLEAVAGE OF ALLYLIC PHENYL CARBONATES PROMOTED BY GROUP 8 TRANSITION METAL HYDRIDO COMPLEXES
Authors: Hayashi Yoshinori , Komiya Sanshiro , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

Carbon–oxygen bonds in allylic phenyl carbonates are selectively cleaved by hydrido complexes of Co, Ru and Rh to give Co(OPh)L3, RuH(OPh)L2 and Rh(OPh)L3 with liberation of propylene and CO2. An intermediate complex RuH(O2COEt)L3 has been isolated in the reaction of RuH2(PPh3)4 with allyl ethyl carbonate. Reaction mechanisms are also discussed.
POLY(VINYLPYRROLIDONE)-BOUND DIPHENYLHEME
Authors: Tsuchida Eishun , Nishide Hiroyuki , Yokoyama Hiroyuki , Young Richard , Chang Chi K
Published: July 2006

trans-5-(o-Aminophehyl)-15-o-[m-(N-imidazolylmethyl)benzamido]phenyl-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphinato iron(II) (diphenylheme) was covalently combined to poly(1-vinyl-2-pyrrolidone); it formed an oxygen adduct in cooled aqueous media.
ASSISTANT EFFECTS OF CYCLODEXTRINS ON THE ALDOL REACTIONS CATALYZED BY ZINC(II) COMPLEXES OF l-TYROSINE ESTER
Authors: Nakagawa Masaji , Maruki Mitsuya , Watanabe Ken-ichi
Published: July 2006

Inclusion compounds of α- and β-cyclodextrins(CD) with p-nitrobenzaldehyde were prepared. They underwent the aldol reactions with acetone in the presence of Zn2+ complexes of l-tyrosine ester to afford an enantiomeric excess aldol-type product. The reactions of the β-CD compound were superior to that of the α-CD one both in reactivity and asymmetric induction.
ION-TRANSPORT ACROSS A MEMBRANE PREPARED BY GLOW DISCHARGE PLASMA POLYMERIZATION OF DICYCLOHEXYL-18-CROWN-6
Authors: Shinkai Seiji , Ishihara Midori , Manabe Osamu , Mizumoto Akira , Osada Yoshihito
Published: July 2006

Dicyclohexyl-18-crown-6 was “polymerized” on an acetylcellulose membrane by a glow discharge plasma. The membrane prepared under proper conditions showed the K+ selectivity in ion-transport.
CHARGE-TRANSFER EFFECT ON SUBSTRATE-BINDING BEHAVIOR OF OCTOPUS-LIKE AZACYCLOPHANES
Authors: Murakami Yukito , Kikuchi Jun-ichi , Tenma Hiroaki
Published: July 2006

The guest-binding efficiency of octopus-like azacyclophanes was examined with five different charge-transfer donors by means of fluorescence spectroscopy. Relative contributions of the hydro-phobic, electrostatic, and charge-transfer interactions in the overall guest-binding process were characterized.
SHORT CHAIN PEPTIDE INHIBITORS OF HUMAN RENIN
Authors: Matsueda Rei , Yabe Yuichiro , Kogen Hiroshi , Higashida Susumu , Koike Hiroyuki , Iijima Yasuteru , Kokubu Tatsuo , Hiwada Kunio , Murakami Eiki , Imamura Yoichi
Published: July 2006

The phenylalanine residue in the C-terminal sequence of angiotensin II was found to be important for the design of renin inhibitors. 1-Naphthyl-alanine(Nal(1))-containing tripeptide analogues such as benzyloxycarbonyl-Nal (1)-His-Leucinal (ES-188) and benzyloxycarbonyl-Nal(1)-His-(3S,4S)-4-amino-3-hydroxy-6-methylheptanoic acid (Statine) 2(S)-methylbuthylamid (ES-254) showed high potency and specificity to human renin.
ENHANCEMENT OF SURFACE BASE PROPERTY OF MAGNESIUM OXIDE BY THE COMBINATION OF METAL ION
Authors: Ueda Wataru , Yokoyama Toshio , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Surface base property of magnesium oxide can be modified by the addition of metal ion. The addition of metal ion with larger ionic radius than Mg2+ causes the increase of the amount of surface base site, whereas the addition of metal ion with smaller ionic radius than Mg2+ shows not to be effective.
ELECTRON-TRANSFER INTERACTION BETWEEN THE COMPLEXED SILVER(I) CATION AND RUTHENIUM ATOM IN POLYOXA[n]- AND 1,n-DIOXATHIA[n]RUTHENOCENOPHANES
Authors: Akabori Sadatoshi , Habata Yoichi , Sato Masaru
Published: July 2006

Polyoxa[n]ruthenocenophanes and 1,n-dioxathia[n]ruthenocenophanes were prepared. The complexes of the ruthenocenophanes with transition metal cations were isolated. The 1H-NMR and electronic spectra of the silver(I) ion-complexed 1,4,7,10,13,16-hexaoxa[16]ruthenocenophane suggested the presence of strong electron-transfer interaction between the complexed silver(I) cation and the ruthenium atom of the ruthenocene nucleus.
REGIOSPECIFIC AND SEQUENTIAL SUBSTITUTION OF TRIMETHYLSILYL-1,6-METHANO[10]ANNULENES VIA THE ELECTROPHILIC ipso-REACTION
Authors: Takahashi Kazuko , Ohnishi Keiichi , Takase Kahei
Published: July 2006

2-Substituted 7-trimethylsilyl-1,6-methano [10] annulenes have been prepared and their electrophilic ipso-desilyl-substitution has been studied, providing a new route for the regiospecific polyfunctionalization of 1,6-methano[10]annulenes.
HYDROGENOLYSIS OF ACYLCOBALT CARBONYL WITH METAL CARBONYL HYDRIDES
Authors: Koyasu Yukio , Fukuoka Atsushi , Uchida Yasuzo , Hidai Masanobu
Published: July 2006

Investigation of dinuclear reductive elimination reactions between hexanoylcobalt tetracarbonyl and various ruthenium and cobalt metal carbonyl hydrides showed that [HRu(CO)4]− reacts much faster to form hexanal than HCo(CO)4. Other hydrides such as [HRu3(Co)11]−, [H2Ru4(CO)12]2−, HRuCo3(CO)12 and HFeCo3(CO)12 are less reactive and compared with the above hydrides.
PHOTOCHEMISTRY OF AN α,β-UNSATURATED γ,δ-EPOXY NITRILE
Authors: Ishii Keitaro , Sakamoto Masanori
Published: July 2006

On 1π, π*-excitation (λ=254 nm, pentane), α,β-unsaturated γ,δ-epoxy nitrile showed selective product formation via carbonyl ylide and carbene intermediates; (E/Z)-isomerization and C(γ),O-cleavage of the oxirane, which are triplet processes, did not occur.
4,5- AND 3,5-BIS(ETHOXYCARBONYL)-2,7-DI-t-BUTYLTHIEPINES. SYNTHESIS AND THERMAL STABILITIES
Authors: Yamamoto Kagetoshi , Matsukawa Atsuhito , Murata Ichiro
Published: July 2006

4,5-Bis(ethoxycarbonyl)-2,7-di-t-butylthiepine and 3,5-bis(ethoxycarbonyl)-2,7-di-t-butylthiepine have been synthesized. Thermal stabilities of these thiepines have been examined and discussed in connection with those of the monocyclic thiepines reported so far.
NOVEL NAZAROV-TYPE CYCLIZATION OF TETRAHYDRO-4-OXOPYRAN-3-CARBOXYLIC ESTERS BY THE USE OF Me3SiCl–NaI REAGENT
Authors: Sakai Takashi , Miyata Kazuyoshi , Takeda Akira
Published: July 2006

Treatment of 2,5,6-tri-substituted tetrahydro-4-oxopyran-3-carboxylic esters with Me3SiCl–NaI reagent in DMF at 120 °C gave cyclopentenone derivatives via the Nazarov-type cyclization subsequent to possible dehydration.
DEPRESSION OF THE COMPLEX FORMATION BETWEEN ZINC TETRAPHENYLPORPHYRINTRISULFONATE (Zn-TPPS3) AND METHYLVIOLOGEN BY THE ADDITION OF SURFACTANT MICELLES
Authors: Okura Ichiro , Kita Tatsuya , Aono Shigetoshi , Kaji Naruhiko
Published: July 2006

Photoreduction of methylviologen was carried out by the irradiation of the system containing triethanolamine, Zn-TPPS3, and methylviologen in the presence of sodium dodecyl sulfate (SDS). The reduction rate increased with methylviologen concentration and reached a constant value which was in contrast with the result observed in the absence of SDS. The result was explained by the depression of the complex formation between Zn-TPPS3 and methylviologen which does not serve as a photosensitizer.
BIS-MYOGLOBIN RECONSTITUTED WITH COVALENTLY BONDED SYMMETRIC HEMES
Authors: Suzuki Akihiro , Okuda Katsuya , Kawagoe Keiko , Toi Hiroo , Aoyama Yasuhiro , Ogoshi Hisanobu
Published: July 2006

Two symmetric hemins were covalently bonded with polymethylene diamine. Reconstitution of bis-hemin with sperm whale apomyoglobin afforded bis-myoglobin(bis-Mb). Absorption spectra and paramagnetic 1H-NMR spectrum of bis-Mb were compared with monomeric myoglobin reconstituted with symmetric heme.
AMINO ACIDS FROM THE YAMATO-791198 CARBONACEOUS CHONDRITE FROM ANTARCTICA
Authors: Shimoyama Akira , Harada Kaoru , Yanai Keizo
Published: July 2006

The Yamato-791198 carbonaceous chondrite yielded indigenous amino acids. These consitst of various structural and optical isomers, indicating abiotic in origin. The amount of these amino acids is the largest of carbonaceous chondrites studied so far. Terrestrial organic contamination was nil to this chondrite.
PRESSURE DEPENDENCE OF THE PHOTOSTATIONARY trans/cis CONCENTRATION RATIO OF 4-DIMETHYLAMINO-4′-NITROAZOBENZENE. A NEW METHOD OF EVALUATING THE REACTION VOLUME
Authors: Tanaka Tohru , Sueishi Yoshimi , Yamamoto Shunzo , Nishimura Norio
Published: July 2006

A simple method of obtaining the reaction volume by means of the photostationary state method has been proposed. The reaction volume for the cis-to-trans thermal isomerization of 4-dimethylamino-4′-nitroazobenzene in some solvents was found to be well correlated to the corresponding activation volume.
SYNTHESES, CHARACTERIZATION, AND MOLECULAR STRUCTURES OF NITROALKANOATO NICKEL(II), ZINC(II), AND CADMIUM(II) COMPLEXES WITH TETRAAZACYCLOALKANES
Authors: Ito Haruko , Ito Tasuku
Published: July 2006

Nickel(II), zinc(II), and cadmium(II) complexes of tetraazacycloalkane (L) (L = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (L1), 7RS,14RS-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (L2), or 1,4,8,12-tetraazacyclopentadecane (L3)) react with nitroalkanes (RR’CHNO2 : R = R′ = H; R = H, R′ = CH3; R = R′ = CH3) in the presence of NEt3 to afford the nitroalkanoato complexes, [M(L)(O2NCRR’)]+ which have been characterized by IR, 1H and 13C NMR spectroscopy, and by X-ray analyses on three compounds.
REDUCTIVE COUPLING OF BENZYL HALIDES USING NICKEL(0)-COMPLEX GENERATED IN SITU IN THE PRESENCE OF TETRAETHYLAMMONIUM IODIDE, A SIMPLE AND CONVENIENT SYNTHESIS OF BIBENZYLS
Authors: Iyoda Masahiko , Sakaitan Masahiro , Otsuka Hiroki , Oda Masaji
Published: July 2006

Zerovalent nickel complex generated in situ by reduction of NiBr2(PPh3)2 with zinc powder in the presence of Et4NI was found to be an effective catalyst for homo-coupling of benzyl halides. The catalytic reactions proceeded smoothly in various solvents under mild conditions to afford dehalogenative-coupling products in good to high yields.
THERMAL NEUTRON IRRADIATION EFFECT OF LITHIUM BORATE GLASSES
Authors: Nishida Tetsuaki , Takashima Yoshimasa
Published: July 2006

Nuclear reactions of 10B(n,α) 7Li and 6Li(n,α) 3H result in an increase in the Mössbauer absorption area of Fe2+, and the irradiation effect caused by the latter reaction proves to be remarkable when the alkali oxide (Li2O) content is low. This is ascribed to the open structure of the borate glasses where BO3 triangles are superior in numbers to BO4 tetrahedra.
THE TYPE I COPPER OF NITRITE REDUCTASE FROM ALCALIGENES SP. NCIB 11015
Authors: Sakurai Takeshi , Suzuki Shinnichiro , Nakahara Akitsugu , Masuko Masayuki , Iwasaki Hidekazu
Published: July 2006

Unique properties of the type I copper from Alcaliqenes sp. NCIB 11015 was characterized in detail through curve analyses of absorption and circular dichroic spectra and resonance Raman spectrum.
CRYSTAL STRUCTURE OF A NEW MOLECULAR CONDUCTOR (DBTTF)[Ni(dmit)2]
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

The crystal of (DBTTF)[Ni(dmit)2] contains uniform, segregated stacks of cations and anions. A three dimensional network of closely spaced molecules leads to intermolecular overlap integrals of the HOMO and LUMO with small anisotropy. This compound is highly conductive and signs of overlap integrals along the two segregated stacks suggest that this compound is the first two-chain system with parallel band structure.
REDUCTION OF HYDROXOCOBALT(III) SCHIFF BASE COMPLEXES WITH ALCOHOLS
Authors: Nishinaga Akira , Kondo Toshiyuki , Matsuura Teruo
Published: July 2006

Hydroxocobalt(III) Schiff base complexes were reduced with alcohols to the corresponding cobalt(II) species quantitatively. Kinetic studies on the reduction suggest a mechanism involving rate determining β-elimination of an alcoholatocobalt(III) complex intermediate.
THE FACTORS DOMINATING THE REVERSAL IN THE SENSE OF THE OPTICAL ROTATION OF DIARYLHEPTANOIDS IN THE SOLVENTS OF THE DIFFERENT NATURE
Authors: Suga Takayuki , Ohta Shinji , Aoki Tadashi , Hirata Toshifumi
Published: July 2006

Causing (s)-1,7-diphenyl-5-hydroxy-3-heptanone dextrorotatory in chloroform was attributed to the formation of the intramolecular hydrogen bond between the C-3 carbonyl and C-5 hydroxyl groups, regardless of the presence of the phenyl groups. On the other hand, causing the compound levorotatory in methanol was proved to necessitate simultaneously the breaking of the intramolecular hydrogen bond followed by the solvation to its β-ketol moiety, as well as the presence of the phenyl groups.
A FACILE, STEREOCONTROLLED ENTRY TO KEY INTERMEDIATES FOR THIENAMYCIN SYNTHESIS FROM ETHYL (S)-3-HYDROXYBUTANOATE
Authors: Chiba Toshiyuki , Nagatsuma Masako , Nakai Takeshi
Published: July 2006

A new synthetic approach to optically active key intermediates for thienamycin synthesis is described which involves the highly stereocontrolled transformation of the 2-azetidinone obtained via the condensation of ethyl (S)-3-hydroxybutanoate with the N-silylimine of trimethylsilylpropynal.
Pd(0)-CATALYZED ELECTRO-REDUCTIVE HYDROCOUPLING OF ARYL HALIDES WITH OLEFINS AND ACETYLENES
Authors: Torii Sigeru , Tanaka Hideo , Morisaki Kazuo
Published: July 2006

Electro-reductive hydrocoupling of aryl halides with olefins and acetylenes has been performed in an Et4NOTs-DMF-(Pb cathode) system in the presence of catalytic amounts of PdCl2(Ph3P)2.
A NEW METHOD FOR DIRECT OXIDATION OF THE METHYLENE GROUP ADJACENT TO A CYCLOPROPANE RING TO THE KETO GROUP
Authors: Hasegawa Takashi , Niwa Haruki , Yamada Kiyoyuki
Published: July 2006

A new finding that the methylene group adjacent to a cyclopropane ring can be oxidized to the keto group directly with ruthenium tetroxide is described.
NEW PALLADIUM-CATALYZED ADDITION OF CYANOTRIMETHYLSILANE TO F-ALKYLATED 1-AZA-1,3-DIENES. A CONVENIENT ROUTE TO β,γ-UNSATURATED α-F-ALKYL-α-AMINO ACID PRECURSORS
Authors: Yamasaki Yasuhiro , Maekawa Takashige , Ishihara Takashi , Ando Teiichi
Published: July 2006

2-F-Alkylated 1-aza-1,3-dienes, easily prepared from 1H-F-1-alkenephosphonates, smoothly underwent the addition of cyanotrimethylsilane in the presence of a catalytic amount of palladium(II) acetate or chloride to give β,γ-unsaturated α-F-alkyl-α-amino nitriles and/or γ-F-alkyl-γ-amino nitriles in good yields.
BAKER’S YEAST HYDROGENATION OF CARBONYL ACTIVATED DOUBLE BONDS. ENANTIOSELECTIVE SYNTHESIS OF THE (S)-FORM OF THE DIHYDROTERPENEDIOL SECRETED BY DANAUS CHRYSIPPUS AND OF A PHEROMONE OF CALLOSOBRUCHUS CHINENSIS L.
Authors: Gramatica Paola , Giardina Giuseppe , Speranza Giovanna , Manitto Paolo
Published: July 2006

The (S)-forms of (E)-3,7-dimethyl-2-octene-1,8-diol (secreted by male danaid butterflies) and of (E)-3,7-dimethyl-2-octene-1,8-dioic acid (a pheromone of the azuki bean weevil) were synthesized via stereoselective hydrogenation by baker’s yeast of the carbonyl activated double bond of achiral precursors.
TETRAKIS(METHYLTHIO)-Δ2,2′-DITHIENO[3,4-d]-1,3-DITHIOLE. A NEW TTF-TYPE DONOR
Authors: Kobayashi Keiji
Published: July 2006

The title compound, which is designed to increase the interstack interaction in the solid state, was synthesized as a new donor for conductive charge-transfer complexes.
HETEROGENEOUS PHOTOCATALYTIC OXIDATION OF NO2− IN AQUEOUS SUSPENSION OF VARIOUS SEMICONDUCTOR POWDERS
Authors: Hori Yoshio , Nakatsu Akiyoshi , Suzuki Shin
Published: July 2006

NO2− ion was shown to be oxidized to NO3− with or without O2 under illumination in aqueous suspension of some semiconductor powders. Photoactive substances were Ag2O, PbO, TiO2(anatase), Si, ZnO, SnO2, CdS, and Bi2O3. The reaction proceeded with band gap illumination of semiconductors.
SYNTHESIS AND REDOX BEHAVIOR OF [Mo(2,4,6-TRIALKYLBENZENETHIOLATO)4]. UNIQUE REDOX PROPERTIES OF TETRA-COORDINATED Mo(IV) COMPLEXES WITH BULKY THIOLATES
Authors: Ueyama Norikazu , Zaima Hiroaki , Nakamura Akira
Published: July 2006

Two new molybdenum(IV) complexes having bulky thiolato ligands, [Mo(2,4,6-trimethylbenzenethiolato)4] and [Mo(2,4,6-triisopropylbenzenethiolato)4], were synthesized. These complexes show paramagnetic properties due to a nearly tetrahedral coordination and exhibit the quasi-reversible redox couples of Mo(V)/Mo(IV) at −0.07 V and +0.47 V vs. SCE, respectively in 1,2-dimethoxyethane. The two bulky isopropyl groups at o-position prevent π-interaction between Mo(IV) and sulfur, providing an ionic character at the Mo–S bond and stabilizing Mo(IV) state against oxidation.
DEHYDROCYCLIZATION OF HEXANE TO BENZENE CATALYZED BY REDUCED ZIRCONIUM OXIDE TREATED WITH SULFATE, SELENATE, AND TELLURATE IONS
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

Dehydrocyclization catalysts for paraffinic hydrocarbons were obtained by exposing Zr(OH)4 to 0.5 M H2SO4, 0.05 M H2SeO4, or 0.05 M H2TeO4 followed by calcination in air at 600–700 °C and reduction at 500–550 °C. The catalytic properties were highly dependent on metal oxides used as supports; ZrO2 was most effective. The catalyst converted hexane into benzene with selectivity up to 84%.
SODIUM BOROHYDRIDE REDUCTION OF CYCLOHEXENONES IN THE PRESENCE OF AMYLOSE
Authors: Chêneverst Robert , Ampleman Guy
Published: July 2006

Amylose can alter the regioselectivity of the sodium borohydride reduction of cyclohexenones. Addition of amylose favours the simple carbonyl reduction over the conjugate reduction.
SYNTHESIS AND PHOTOCHROMIC BEHAVIOR OF ELASTOMERIC IONENE CONTAINING VIOLOGEN UNITS
Authors: Kohjiya Shinzo , Hashimoto Tamotsu , Yamashita Shinzo , Irie Masahiro
Published: July 2006

Ionene-type polymer containing viologen units was synthesized by the reaction of dicationic living poly(tetrahydrofuran) with 4,4′-bipyridine at −70 °C. This viologen polymer (PTV) was easily formed into a thin, tough, and highly elastic film. The methanol solution of PTV with ethylenediaminetetraacetic acid tetrasodium salt (EDTA) and proflavine, the N-methyl-2-pyrrolidone solution of PTV, and the thin film of PTV containing poly(N-vinyl-2-pyrrolidone) showed the photochromic property, i.e., color change by the irradiation of light.
PREPARATION AND SPECTRAL PROPERTIES OF trans- AND cis-DINITROBIS(TETRAMETHYLENEDIAMINE)COBALT(III)
Authors: Nagata Kiyonori , Kanamori Kan , Kawai Kiyoyasu , Ogino Hiroshi
Published: July 2006

The isomeric pair, trans- and cis-[Co(NO2)2(tmd)2]NO3, where tmd denotes tetramethylenediamine, were newly prepared. The geometrical configurations were determined on the basis of their electronic absorption spectra. The isomers show the characteristic Raman bands due to ν(CO–NH2(tmd)) which allow for the distinction of their geometrical configurations. trans-[COCI2(tmd)2]Cl was derived from the dinitro complex in a preferable yield.
A REGIO- AND STEREOSELECTIVE SYNTHESIS OF ALDOLIZED γ-DIKETONES VIA TIN(IV) BISENOLATES BY THE USE OF BIS(2-PYRIDINETHIOLATO)TIN(II)
Authors: Mukaiyama Teruaki , Ichikawa Junji , Toba Makoto , Hayashi Masaji
Published: July 2006

Tin(IV) bisenolates of γ-diketones, generated regioselectively from α,β-unsaturated γ-diketones by the reaction with bis(2-pyridinethiolato)tin(II), react with aldehydes stereoselectively to afford the corresponding aldolized γ-diketones in good yields.
SYNTHESIS OF 2-METHYLENETRICYCLO[4.3.2.01,5]UNDECAN-3-ONES INVOLVING A SPIRO CYCLOPROPANE RING
Authors: Kakiuchi Kiyomi , Tadaki Toshihiro , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

Biologically active 2-methylenetricyclo[4.3.2.01,5]undecan-3-ones involving a spiro cyclopropane ring related to quadrone have been synthesized.
OXIDATION OF α-HYDROXYKETONES WITH TRIPHENYLANTIMONY DIBROMIDE AND ITS CATALYTIC CYCLE
Authors: Akiba Kin-ya , Ohnari Hideyuki , Ohkata Katsuo
Published: July 2006

α-Hydroxyketones were oxidized into α-diketones with triphenylantimony dibromide in the presence of two equiv. of base. Antimony-catalyzed debromination and oxidation cycle was devised for the system of ethyl 2,3-dibromo-3-phenylpropionate and α-hydroxyketones.
A NEW REARRANGED LANOSTANOID, MARIESIIC ACID A, FROM THE SEED OF ABIES MARIESII
Authors: Hasegawa Shinichi , Miura Tadayoshi , Hirose Yoshiyuki , Iitaka Yoichi
Published: July 2006

An antimicrobial triterpenoic acid, named mariesiic acid A, has been isolated from the seed of Abies mariesii. The structure with a rearranged lanostane-type skeleton has been elucidated by spectral and X-ray diffraction analyses.