bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNERGISTIC EFFECT IN ALUMINA SUPPORTED Pt–Ru BIMETALLIC CLUSTER CATALYSTS USED FOR DEHYDROGENATION OF CYCLOHEXANE
Authors: Miura Hiroshi , Osawa Masashi , Suzuki Tsutomu , Sugiyama Kazuo , Matsuda Tsuneo
Published: July 2006

The dehydrogenation of cyclohexane, accompanying hydrogenolysis, was studied over well characterized Pt–Ru/Al2O3 catalysts. For dehydrogenation synergistic effect was clearly observed, whereas for hydrogenolysis simple dilution effect was observed.
HCo(CO)4 AS AN ACID CATALYST IN VINYL ETHER REACTIONS
Authors: Freudenberger John H , Matsui Yasushi , Orchin Milton
Published: July 2006

At room conditions in the presence of alcohols, HCo(CO)4 instead of being consumed by vinyl ethers, functions as an acid catalyst for acetal formation.
REARRANGEMENT OF ALLYLIC N-PHENYLFORMIMIDATES TO N-ALLYL-N-PHENYLFORMAMIDES CATALYZED BY PALLADIUM COMPLEXES
Authors: Ikariya Takao , Ishikawa Yasutoshi , Hirai Kiyomiki , Yoshikawa Sadao
Published: July 2006

The palladium complexes such as Pd(PPh3)4 and Pd(PhCN)2Cl2 catalyzed the rearrangement of allylic N-phenylformimidates to give N-allyl-N-phenylformamides under a mild condition. The reaction courses are strongly influenced by the oxidation state of palladium complexes used.
ELECTROCHEMICAL S–S BOND FISSION OF 4-(2-BENZOTHIAZOLYLDITHIO)AZETIDINONES (KAMIYA’S DISULFIDES)
Authors: Torii Sigeru , Tanaka Hideo , Siroi Takashi , Sasaoka Michio , Saitoh Norio , Nokami Junzo , Tada Nobuhito
Published: July 2006

An electrochemical S-S bond fission of 4-(2-benzothiazolyldithio)azetidinones derived from penicillin G has been achieved by the selection of an appropriate electrolysis system, providing either 2β-halomethylpenicillins, 3β-halocephams, or 4-methoxysulfinylazetidinone derivatives.
SYNTHESIS AND PROPERTIES OF 4- AND 4,5-SUBSTITUTED 2,7-DI-tert-BUTYLTHIEPINS
Authors: Yamamoto Kagetoshi , Yamazaki Shoko , Kohashi Yasuji , Matsukawa Atsuhito , Murata Ichiro
Published: July 2006

Various 4- and 4,5-substituted 2,7-di-tert-butylthiepins such as 4-ethoxycarbonyl-(6), 4-formyl- (7), 4-hydroxymethyl- (8), 4-methyl- (12), 4-methy1-5-hydroxymethy1-(13), and 4,5-dimethyl derivatives (16), and so on, were synthesized by functional group transformation and some of their properties were examined.
LATTICE CONSTANTS OF MONOCLINIC (La0.8Ca0.2)MnO3
Authors: Tanaka Junzo , Takahashi Koichiro , Yajima Yoshiyuki , Tsukioka Masayuki
Published: July 2006

The homogeneous sample of (La0.8Ca0.2)MnO3 was prepared by the coprecipitation method and its lattice constants were determined by X-ray powder diffraction to be a=c=7.759Å, b=7.745Å and β=90.3°. The homogeneity of the distribution of ions can be seen in the narrow half-widths of X-ray reflections.
SYNTHESIS OF PLERAPLYSILLIN-1
Authors: Masaki Yukio , Hashimoto Kinji , Serizawa Yuzuru , Kaji Kenji
Published: July 2006

A marine sesquiterpene, pleraplysillin-1 was synthesized by way of coupling of an ochtodane derivative with 3-furfuryl bromide, and regio- and stereoselective olefinations.
ISOMERIZATION OF BUTYNES TO 1,3-BUTADIENE OVER SOLID BASE CATALYSTS
Authors: Sato Kenji , Hattori Hideshi
Published: July 2006

1-Butyne and 2-butyne underwent isomerization to 1,3-butadiene over CaO, SrO, MgO, La2O3, ThO2 and ZrO2 catalysts below 100°C. Among these catalysts, the CaO catalyst exhibited the highest activity, and was active even at 30°C.
5-CYCLOHEPTATRIENYLIDENE-2(5H)-FURANONE CHARACTERIZATION OF A FURAN-INSERTED TYPE COMPOUND OF TROPONE
Authors: Takahashi Kazuko , Nishijima Kazumi , Makino Naonori , Takase Kahei , Katagiri Shigeyoshi
Published: July 2006

The title compound, a new inserted type tropone, has been prepared. This planar compound showed an unexpectedly small contribution of the dipolar structure to the ground state, as compared with parent tropone, suggesting a general trend that the net conjugative electronic interaction between a cycloheptatrienylidene group and an electronegative oxygen atom is slight. The slight conjugative interaction was evidenced by a weak electronic spectral E1 band having a C-T character.
HYDROGEN SENSITIVE GAS DETECTOR USING SILVER ADDED TIN(IV) OXIDE
Authors: Yamazoe Noboru , Kurokawa Yasuhiro , Seiyama Tetsuro
Published: July 2006

A semiconductor gas sensor using silver added tin dioxide was found to exhibit high sensitivity to H2 compared with that to C3H8, CH4, or CO at RT ∼250°C. The promoting effects of Ag for the H2 detection was very sensitive to its loading, an optimum loading being ca. 1.5 wt%.
SPONTANEOUS RESOLUTION AND CRYSTAL STRUCTURE OF BIS(ETHYLENEDIAMINE) (2-SELENINATOETHYLAMINE)COBALT(III) NITRATE
Authors: Okamoto Ken-ichi , Konno Takumi , Nomoto Masayo , Einaga Hisahiko , Hidaka Jinsai
Published: July 2006

The absolute configuration of the spontaneously resolved title compound was determined by X-ray diffraction study. The employed crystal which showed a negative CD value at 500 nm has Δ configuration. The 2-seleninatoethylamine is bound to the cobalt atom by the N and O atoms and the asymmetric selenium atom takes S configuration. The six-membered chelate ring formed takes a chair conformation.
PRE-MELTING STATE OF METHYLAMMONIUM NITRATE AND PERCHLORATE AS REVEALED BY 1H NMR STUDIES
Authors: Ishida Hiroyuki , Ikeda Ryuichi , Nakamura Daiyu
Published: July 2006

A new unusual crystalline phase of methylammonium nitrate and perchlorate, where methylammonium-ionic diffusion takes place, was found at various temperatures between 352 and 384 K, and above 451 K, respectively. The activation energy for the self-diffusion of the cation in both salts was determined as 29 kJ mol−1.
MOLYBDENUM PEROXIDE-CATALYZED REACTION OF 1,2-DIOLS WITH DIMETHYL SULFOXIDE
Authors: Masuyama Yoshiro , Usukura Masa-aki , Kurusu Yasuhiko
Published: July 2006

The reaction of 1,2-diols with dimethyl sulfoxide-catalytic molybdenum peroxide in refluxing toluene generally resulted in monoprotection of diols to give 2-methylthiomethoxy-l-ols (Course A) Exceptionally, a) cis-1,2-cyclooctanediol and benzopinacol, and b) 1,2-cyclododecanediol caused C–C bond cleavage (Course B) and monooxidation (Course C), respectively as Scheme 1.
POTENTIOMETRIC STUDY OF HETEROPOLYANION FORMATION FROM METHYLARSONATE AND MOLYBDATE ANIONS
Authors: Takahama Hironobu , Yagasaki Atsushi , Sasaki Yukiyoshi
Published: July 2006

The equilibria between CH3AsO32−, MoO42− and proton were studied by the use of a glass electrode in 1M Na(Cl) ionic medium at 25 °C. The data were explained assuming (H+)p(MoO42−)q (CH3AsO32−)r where (p,q,r) = (7,4,1), (8,4,1), (12,6,1), (13,6,1) together with (11,6,2) or (12,6,2).
DIASTEREOMERS OF ROTAXANE COMPOSED OF LONG-BRIDGED DINUCLEAR COBALT(III) COMPLEX AND α-CYCLODEXTRIN
Authors: Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

Two optically active diastereomers of [2]- [[(en)2Co{NH2(CH2)2S(CH2)12S(CH2)2NH2}Co(en)2]Cl6]-[α-cyclodextrin]-rotaxane, [ΔΔ]-[α-CDX] and [ΛΛ]-[α-CDX], were isolated and characterized from their absorption, circular dichroism, and 13C NMR spectra. The yield of ΔΔ isomer is ca. 28%, whereas that of ΔΔ isomer only ca. 14%.
MOLECULAR STRUCTURE OF [(η5-C5H5)2Zr(CH2=C(CH3)=CH-CH2)  \llap—C(CH3)] PREPARED BY REGIOSELECTIVE INSERTION OF 2-BUTYNE TO Zr(η5-C5H5)2(ISOPRENE)
Authors: Kai Yasushi , Kanehisa Nobuko , Miki Kunio , Kasai Nobutami , Mashima Kazushi , Nagasuna Kinya , Yasuda Hajime , Nakamura Akira
Published: July 2006

The X-ray structure analysis revealed a unique 1-3-η;6-η-(2E,5Z)-2,5-dimethyl-2,5-heptadien-1,6-diyl ligand bound to Zr(η5-C5H5)2 species.
A NEW TYPE OF CRYSTALLINE 1:1 MOLECULAR COMPLEX FORMATION SPECIFIC FOR THE SHAPE OF NONPOLAR GROUPS
Authors: Endo Tadashi , Miyazawa Kazuhiro , Endo Masayuki , Uchida Akira , Ohashi Yuji , Sasada Yoshio
Published: July 2006

The formation of crystalline 1:1 molecular complexes was examined between a pair of acylurea derivatives (1 and 2) having a wide variety of alkyl groups as nonpolar substituents (R1 and R2). The complex formation has been found to depend on the shapes of R1 and R2. This suggests the presence of specific weak interactions between the nonpolar groups.
THE CRYSTAL STRUCTURE OF DI(2,3,6,7-TETRAMETHYL-1,4,5,8-TETRASELENAFULVALENIUM)TETRAFLUOROBORATE, (TMTSF)2BF4
Authors: Kobayashi Hayao , Kobayashi Akiko , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

The crystals of 2C10H12Se41⁄2+.BF4−((TMTSF)2BF4) belong to the triclinic system. The space group is P\={l} and the lattice constants are: a=7.255(1), b=7.647(1), c=13.218(3) Å, α=82.23(2), β=87.15(2), γ=70.36(1)°, Z=1, V=688.10 Å3. The nearly planar TMTSF groups stack in diadic columns along a. The intrastack and interstack contacts between Se atoms show the two-dimensional nature of the crystal.
Rh(I) COMPLEXES CONTAINING FULLY ALKYLATED MONO- AND DIPHOSPHINE LIGANDS AS HIGHLY ACTIVE HYDROGENATION CATALYSTS FOR CARBONYL COMPOUNDS
Authors: Tani Kazuhide , Suwa Kenichi , Tanigawa Eiji , Yoshida Toshikatsu , Okano Tamon , otsuka Sei
Published: July 2006

Our search for highly active hydrogenation catalysts for carbonyl compounds, starting with neutral Rh(I) hydride complexes, [RhH(PR3)n] (R=i-Pr, n=3; R=Cy, n=2), has led to the discovery of cationic Rh(I) complexes with fully alkylated diphosphine ligands, [Rh{(i-Pr)2P(CH2)nP(i-Pr)2}(NBD)]Cl04 (n=3,4). These compounds prove to be versatile and efficient for hydrogenation of a variety of carbonyl compounds, including aldehydes.
A PVC MATRIX MEMBRANE COPPER ION-SELECTIVE ELECTRODE BASED ON A MACROCYCLIC POLYTHIAETHER
Authors: Kamata Satsuo , Higo Morihide , Kamibeppu Takashi , Tanaka Ichiro
Published: July 2006

The polyvinyl chloride (PVC) membrane electrode based on the macrocyclic polythiaether, 13,14-benzo-1,4,8,11-tetrathiacycropentadecane (TTX), exhibits the Nernstian behavior to the copper ion. The response time is rapid (< 20 sec) and the detection limit is of the order of 10−5 M.
INTRAMOLECULAR WITTIG-HORNER REACTION OF DIMETHYL 2-(o-ACYLBENZOYL)-l, 2-DIHYDROISOQUINOLINE-l-PHOSPHONATE : FACILE SYNTHESIS OF AN ISOQUINOLINE ALKALOID SKELETON
Authors: Akiba Kin-ya , Negishi Yoshio , Inamoto Naoki
Published: July 2006

Dimethyl 2-(o-acylbenzoyl)-1,2-dihydroisoquinoline-1-phosphonates (3) were prepared from isoquinoline, o-acylbenzoyl chloride, and trimethyl phosphite. Intramolecular Wittig-Horner reaction of 3 with LDA afforded good yields of 13-substituted 8H-dibenzo [a, g]quinolizin-8-ones (4) which bear an isoquinoline alkaloid skeleton.
PHOTO-OXIDATION OF ARYL ETHERS IN THE PRESENCE OF FERRIC CHLORIDE
Authors: Seguchi Kazuyoshi , Hirota Sanae
Published: July 2006

Photo-oxidation of aryl ethers in the presence of ferric chloride in aqueous acetonitrile afforded alcohols, aldehydes (or ketones), and N-alkylacetamides. One electron-transfer mechanism from the ether to Fe(III) was suggested for this photo-oxidation.
SOLVOLYSIS OF SPIRO[2.5]OCTA-1,4,7-TRIEN-6-ONES EVIDENCE OF A VINYL CATION INTERMEDIATE
Authors: Ikeda Toshihiko , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Ethanolysis of 1-aryl-5,7-di-t-butyl-2-phenylspiro[2.5]octa-1,4,7-trien-6-one 2 proceeds via a vinyl cation generated by opening of the cyclopropene ring, judging from regiospecific ring opening and kinetics (ρ+=−3.0, m= 0.53, and rate dependence on pH of the solvent).
A NEIGHBOURING GROUP PARTICIPATION OF ORTHO-METHOXYL GROUP IN SOLVOLYTIC REACTION OF SPIRO[2.5]OCTA-1,4,7-TRIEN-6-ONES
Authors: Ikeda Toshihiko , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

In aqueous ethanol 1-aryl-5,7-di-t-butyl-2-(o-methoxyphenyl)spiro[2.5]octa-1,4,7-trien-6-one 4 changed to 2-aryl-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)benzofuran 5 in a more than 90% yield. The selective formation of 5 is ascribed to a neighbouring group participation of the ortho-methoxyl group to an incipient vinyl cation.
THE ROLE OF ADDITIVES ON THE IMPROVEMENT OF THE ISOTACTICITY OF POLYPROPYLENE—A POSSIBLE INTERPRETATION
Authors: Soga Kazuo , Sano Tsuneji , Yamamoto Kazunori , Shiono Takeshi
Published: July 2006

Polymerization of propylene and isoprene were conducted with the catalytic systems of TiCl4/Al(C2H5)3 and TiCl4/MgCl2/Al(C2H5)3 using ethyl benzoate and 2,2,6,6-tetramethylpiperidine as Lewis bases. With increasing the concentration of these Lewis bases, the stereospecificities increased toward more isotactic and more trans-1,4-addition. The role of Lewis bases on the stereospecificities was proposed based on the result.
NEW METHOD FOR THE SYNTHESIS OF GLYCOSYL GLYCERIDES—THE STEREOSELECTIVE REDUCTION OF GLYCOSIDES OF 1-ALKOXY-3-HYDROXYACETONE—
Authors: Mukaiyama Teruaki , Tanaka Shin , Asami Masatoshi
Published: July 2006

Glycosides of 1-hexadecyloxy-3-hydroxyacetone are prepared from 1-halosugars and 1-O-hexadecyl-2-O-benzylglycerol. The glycosides are converted to the corresponding alcohols, precursors to the synthesis of glycosyl glycerides, by the stereoselective reduction with l-Selectride.
PREPARATION OF NEW CATION-EXCHANGERS DERIVED FROM TOYOPEARL GEL AND THEIR APPLICATION TO THE RESOLUTION OF COBALT(III) COMPLEXES
Authors: Fujita Miho , Yoshikawa Yuzo , Yamatera Hideo
Published: July 2006

Cation-exchangers with tartrate residues as chiral exchanging groups were newly prepared from Toyopearl gel. Short columns of these exchangers were successfully used for a highly efficient resolution of cobalt(III) complexes such as [Co(en)3]3+, [Co(tn)3]3+, and fac-[Co(β-ala)3]; complete resolutions were effected by a recycling chromatographic technique.
PREPARATION AND ELECTROCHEMICAL BEHAVIORS OF IRON(III) OCTAETHYLPORPHYRINS COORDINATED BY CATECHOL MONO ANIONS
Authors: Sugimoto Hiroshi , Ueda Nobuhiro , Mori Masayasu
Published: July 2006

Iron(III) octaethylporphyrin complexes coordinated by mono anions of catechol and 3,5-di-tert-butylcatechol were prepared. These Fe(III) high-spin complexes showed an irreversible one-electron redox couple for the coordinated catechol anion, in addition to two one-electron quasi-reversible FeII/FeIII, and FeIII/FeIV redox couples.
REACTIONS OF COORDINATED DINITROGEN WITH ALCOHOL/KETONE SYSTEMS
Authors: Hidai Masanobu , Yokotake Ichiro , Takahashi Tamotsu , Uchida Yasuzo
Published: July 2006

Treatment of cis-[W(N2)2(PMe2Ph)4] (I) with alcohol/ketone systems such as methanol/acetone at 50 °C followed by base distillation yields hydrazine as a main nitrogen hydride. Addition of KOH to the systems results in an increase of free hydrazine formation.
A TOTAL SYNTHESIS OF (±)-INTEGERRIMINE
Authors: Narasaka Koichi , Sakakura Toshiyasu , Uchimaru Tadafumi , Morimoto Kiyoshi , Mukaiyama Teruaki
Published: July 2006

A total synthesis of a 12-membered bislactonic pyrrolizidine alkaloid, integerrimine, has been achieved.
SYNTHESIS AND PROPERTIES OF A SERIES OF 1,2,3,4-TETRAHYDRO-1,4-ETHYLIDENEBENZOTROPYLIUM SALTS
Authors: Yamochi Hideki , Nakasuji Kazuhiro , Nakazawa Tomoo , Murata Ichiro
Published: July 2006

A series of tropylium ions incorporated into bicyclo[2.2.1]heptane skeleton having exo-methylene π-system, 1,2,3,4-tetrahydro-1,4-ethylidenebenzotropylium salts, has been synthesized and their charge-transfer interaction and the thermodynamic stability have been examined.
PHOTOCHEMICAL REACTION OF NAPHTHALENE WITH CIS- AND TRANS-CYCLOOCTENE
Authors: Inoue Yoshihisa , Nishida Katsuyuki , Ishibe Koichi , Hakushi Tadao , Turro Nicholas J
Published: July 2006

Irradiation(>300 nm) of naphthalene(1, 0.1 M) and trans-cyclooctene(2t, 0.1 M) yielded the cis-isomer(2c) and three 1:1 adducts 3–5, whereas 2c(0.1 M) did not give any products under the same conditions. A singlet mechanism is proposed on the basis of Stern–Volmer studies on fluorescence, singlet lifetime, and the adduct formation.
SYNTHESIS OF THE STEROIDAL LACTONE MOIETY OF WITHANOLIDES
Authors: Hirayama Masao , Gamoh Keiji , Ikekawa Nobuo
Published: July 2006

A facile synthesis of the steroidal α,β-disubstituted α,β-unsaturated-δ-lactones with 22R-configuration, withanolide side-chain lactones, was described.
PREPARATION AND CHARACTERIZATION OF IRON(III) COMPLEXES OF N-METHYLOCTAETHYLPORPHYRIN
Authors: Ogoshi Hisanobu , Kitamura Satoru , Toi Hiroo , Aoyama Yasuhiro
Published: July 2006

Iron(III) complexes of N-methyloctaethylporphyrin, [Fe(III)-(N–CH3-OEP) (Cl)]+ X− (X = FeCl4 (1), ClO4 (2)), were prepared. The central metal of complex (2) is confirmed to be in a high-spin (S = 5/2) state on the basis of magnetic susceptibility and ESR parameters. These complexes form monopyridine adducts in solution.
A “DIP-GROWN” CdSe PHOTOANODE IN PHOTOELECTROCHEMICAL CELL
Authors: Minoura Hideki , Kobayashi Ikunori , Ueno Yasusada , Tsuiki Masayasu
Published: July 2006

CdSe films can be grown simply by dipping Cd metal in an SeO2-containing acid solution. These film electrodes without any additional treatment exhibit fairly good photoanodic characteristics. This enables us to fabricate a large-scale photoelectrochemical cell very easily.
A STEREOSELECTIVE SYNTHESIS OF α,β-DIHYDROXY KETONES. AN ALDOL REACTION OF ENEDIOL-TYPE CYCLIC VINYLOXYBORANES
Authors: Mukaiyama Teruaki , Yamaguchi Masahiko
Published: July 2006

α,β-Dihydroxy ketones are synthesized stereoselectively by the aldol reaction of 1,3,2-dioxaboroles, formed from α-hydroxy ketones and phenylboronic acid, and aldehydes.
SYNTHETIC CONTROL BY INTERNAL COORDINATION OF METAL SALTS THE INTRAMOLECULAR ENE REACTIONS OF N-(3-METHYL-2-BUTENYL)-N-(2-HYDROXYPHENYL)ACRYLAMIDES
Authors: Iwasawa Nobuharu , Takebayashi Toyonori , Mukaiyama Teruaki
Published: July 2006

An efficient method for acceleration of the intramolecular ene reactions is established. The magnesium salts of N-(3-methyl-2-butenyl)-N-(2-hydroxyphenyl)acrylamides afford the corresponding cyclized products in high yields with the predominant formation of δ-lactams.
A SIMPLE SYNTHESIS OF 2-AZIDO-2-ALKENOATES
Authors: Kakimoto Masa-aki , Kai Mariko , Kondo Kiyosi
Published: July 2006

The title compounds are derived from 2,3-dibromoalkanoates by treatment with 3 equivalents of sodium azide.
NEW ANIONIC CONDUCTORS: CROWN ETHER COMPLEXES OF ALKALI-METAL IODIDES AND ALKALINE-EARTH METAL IODIDES
Authors: Fujimoto Masaharu , Nogami Takashi , Mikawa Hiroshi
Published: July 2006

Crown ether complexes of alkali-metal iodides or alkaline-earth metal iodides were found to be a new kind of iodide ion conductors. The more the kind of the component molecules in a complex was, the higher was the ionic conductivity. An iodine concentration cell was fabricated by using the complex as the electrolyte.
PREPARATION AND BEHAVIORS OF ENZYMES IMMOBILIZED BY POLYMER–POLYMER COMPLEXES
Authors: Osada Yoshihito , Iino Yasuhiro , Numajiri Yoko
Published: July 2006

Invertase was immobilized by the polymer–polymer complexes between poly(methacrylic acid) and its complementary polymers. Obtained enzymes exhibited sufficiently high activities with enhanced stabilities against enzyme-inhibitors.
THE HOFMANN REARRANGEMENT INDUCED BY ELECTROORGANIC METHOD
Authors: Shono Tatsuya , Matsumura Yoshihiro , Yamane Shin-ichiro , Kashimura Shigenori
Published: July 2006

The Hofmann rearrangement has been induced by the electroorganic method using potassium bromide as a mediator, of which role in the reaction is really catalytic.
AN EFFICIENT METHOD FOR THE STEREOSELECTIVE SYNTHESIS OF TRICYCLIC COMPOUNDS—THE INTRAMOLECULAR DIELS–ALDER REACTION OF CYCLIC α,β-UNSATURATED CARBOXAMIDES—
Authors: Takebayashi Toyonori , Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

An efficient method for the stereoselective synthesis of tricyclic compounds was studied by the intramolecular Diels–Alder reaction utilizing the internal coordination of the magnesium salt. The magnesium salts of N-(2,4-alkadienyl)-N-(2-hydroxyphenyl) cyclopent-1-enecarboxamides afford predominantly trans-fused cycloadducts via exo-mode of cyclization.
PREPARATION AND ELECTRICAL PROPERTIES OF Eu(II)xNb(II)1−xO
Authors: Ishikawa Kenji , Adachi Gin-ya , Shiokawa Jiro
Published: July 2006

Two new compounds, EU0.33Nb0.67O and Eu0.5Nb0.5O, have been found in the ternary system Eu(II)x Nb(II)1−xO. Electrical resistivity measurements have shown that EU0.33Nb0.67O is a metallic conductor while Eu0.5Nb0.5O is a semiconductor. Strontium analogs of these compounds, Sr0.33Nb0.67O and Sr0.5Nb0.5O, have also been attempted to prepare. The former was obtained as a single phase.
THE IDENTIFICATION OF THE COMPOSITION OF THE INSOLUBLE ADDITION COMPOUND
Authors: Hihara Goro , Miyamae Hiroshi , Nagata Miharu
Published: July 2006

A method has been developed for ascertaining the compositions of the insoluble compounds which may be grown by addition reactions of an insoluble substance with a soluble substance in a solution. This method was applied to the addition reaction of lead(II) iodide with ethylenediamine(en) in a ternary system of PbI2-en-ethanol, and three addition compounds are identified as 3PbI2·2(en), PbI2·(en), and PbI2·2(en).
SELECTIVE α-CLEAVAGE IN PHOTOLYSIS OF 7-SUBSTITUTED-6,9-DIMETHYL-6,7,8,9-TETRAHYDRO-6α,9α-EPOXYBENZOCYCLOOCTENE-5,10-DIONE
Authors: Osuka Atsuhiro , Suzuki Hitomi , Maruyama Kazuhiro
Published: July 2006

Photolysis of the title compounds in benzene gave spirophthalides and E- and Z-alkylidene phthalides via preferential α-cleavage at the more crowded side. On the basis of quantum yields and triplet lifetimes, this preference is indicated to arise from the different efficiencies of the radical recombination of possible biradicals.
DECAY MECHANISM OF THE 1-HYDRO-4-PHENYLPYRIDINYL RADICAL
Authors: Sano Yutaka , Tero-Kubota Shozo , Ito Osamu , Ikegami Yusaku
Published: July 2006

Intermediate formation of radical pair has been proposed in the dimerization of 1-hydro-4-phenylpyridinyl radical from the observation of two-step decay of the radical, in which the fast step is represented by second-order and the slow step is first-order. The activation parameters were determined.
PHOTOCHEMICAL CONVERSION OF PYRAZOLES TO ENAMINONITRILES AND IMIDAZOLES
Authors: Wakamatsu Shigeru , Barltrop John A , Day A Colin
Published: July 2006

Irradiation of pyrazole, 1-methylpyrazole and 4-cyano-1-methylpyrazole gave 3-aminoacrylonitrile, 3-methylaminoacrylonitrile and 2-cyano-3-methylaminoacrylonitrile along with corresponding imidazoles. A new pathway is proposed in which both enaminonitrile and imidazole are produced immediately from pyrazole, besides the sequence of pyrazole→enaminonitrile→imidazole.
SYNTHESES OF LICOISOFLAVONE A AND 5′-ALKENYL ISOMER
Authors: Tsukayama Masao , Fujimoto Kunihiro , Horie Tokunaru , Yamashita Yoshiro , Masumura Mitsuo , Nakayama Mitsuru
Published: July 2006

2′,4′,5,7-Tetrahydroxyisoflavone was partially benzoylated with benzoyl chloride to give 7-benzoyloxy-2′,4′,5-trihydroxyisoflavone. The condensation of 7-benzoyloxyisoflavone with 2-methyl-3-buten-2-ol, followed by the hydrolysis of the resultant 3′-(3-methyl-2-butenyl)isoflavone afforded licoisoflavone A. Its 5′-(3-methyl-2-butenyl) isomer was also synthesized from 5-benzoyloxyisoflavone.
DIANION OF DIETHYL SUCCINATE: REACTIONS WITH ALKYLATING AGENTS AND CARBONYL COMPOUNDS
Authors: Pohmakotr Manat , Reutrakul Vichai , Phongpradit Tipparat , Chansri Arayan
Published: July 2006

Dianion of diethyl succinate reacted readily with alkylating agents and carbonyl compounds to give α,β-dialkylsubstituted diethyl succinate and paraconic esters respectively. The conversion of some paraconic esters into 4-carboethoxycyclopentenones was also demonstrated.
PREPARATION OF SEVERAL NEW Ni- OR Pd-CONTAINING CYCLIC AMIDE AND ESTERS, (PR3)nNiCH2CH2CH2COZ (Z = NH, O) AND PCY3PdCH2CH2CH2COO, AND RING CONTRACTION OF THE SIX-MEMBERED Ni-CONTAINING CYCLIC ESTER TO ITS FIVE-MEMBERED ISOMER
Authors: Sano Kenji , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

New metallacyclic amide and esters (PCy3NiCH2CH2CH2CONH, (PR3)nNiCH2CH2CH2COO, PCy3pdcH2CH2CH2COO) have been prepared by reactions of zero-valent nickel and palladium complexes with unsaturated amide and acid. The 6-membered Ni-containing cyclic ester undergoes a ring contraction reaction to a 5-membered isomer.
SYNTHESIS OF AZULENO[2,1-d]THIAZOLE
Authors: Yamane Kameji , Fujimori Kunihide , Ichikawa Shuji
Published: July 2006

Azuleno[2,1-d]thiazoles were obtained by the deamination of 2-aminoazuleno[2,1-d]thiazoles, which were synthesized by the treatment of ethyl 2-acetylamino-3-thiocyanatoazulene-1-carboxylate with base or aluminum oxide.
GENERATION, CHARACTERIZATION AND QUENCHING OF THE DIANION OF TETRAKIS(TRIMETHYLSILYL)ETHYLENE
Authors: Sakurai Hideki , Nakadaira Yasuhiro , Tobita Hiromi
Published: July 2006

Reduction of tetrakis(trimethylsilyl)ethylene with excess lithium gave a stable dianion, the first dianion of nonconjugated olefin. NMR characteristics as well as quenching experiments are described.
REACTION OF CHALCONES WITH 2,4-BIS(4-METHOXYPHENYL)-1,3,2,4-DITHIADIPHOSPHETANE-2,4-DISULFIDE
Authors: Kametani Shunichi , Ohmura Haruo , Tanaka Hideyuki , Motoki Shinichi
Published: July 2006

Though the reaction of chalcones 2 with 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide 1 in refluxing benzene gave the corresponding thiochalcone dimers 3, the reaction in refluxing xylene gave new phosphorus-containing compounds, 2-(4-methoxyphenyl)-3,5-diaryl-Δ4-1,2-thiaphospholene-2-sulfides 4.
EFFECTS OF HETERO- AND PERIPHERAL SUBSTITUTIONS ON PHOTOCURRENT QUANTUM YIELDS: PARA-SUBSTITUTED TETRAPHENYLDITHIAPORPHYRINS
Authors: Yamashita Kazuo , Yamamoto Toshimasa , Shimidzu Hiroaki , Suzuki Hitomi
Published: July 2006

Replacement of two NH groups of the porphyrin in meso-tetraphenylporphinato core by two S atoms shifts the oxidation potential to the positive direction and increases the photocurrent quantum yields of the Al/Porphyrin/Ag cells. The previously observed correlation between the ease of oxidation of porphyrins and the higher quantum yields was confirmed in a series of para- substituted tetraphenyldithiaporphyrins.
FLAVIN-Zr4+ COMPLEX AS OXIDATION CATALYST
Authors: Shinkai Seiji , Ishikawa Yu-ichi , Manabe Osamu
Published: July 2006

A new metal-coordinative flavin, 2,4-dimethylpyrido[5,6-h](10-methyl)isoalloxazine was synthesized. The complex with Zr4+ acted as an efficient catalyst for the oxidation of alcohols and ascorbic acid under mild reaction conditions.
CORRELATION BETWEEN REDUCTION POTENTIAL AND CHARGE-TRANSFER FREQUENCY OF ALKOXO-BRIDGED BINUCLEAR COPPER(II) COMPLEXES OF VARIOUS TRIDENTATE LIGANDS
Authors: Mikuriya Masahiro , Nakamura Masaaki , Okawa Hisashi , Kida Sigeo
Published: July 2006

Spectral and electrochemical properties of alkoxo-bridged binuclear copper(II) complexes of various tridentate ligands with NNO-, NSO-, SNO- and SSO-donor sets were examined. Reductions of the complexes with NNO-, NSO(and SNO)- and SSO-donor sets occurred at −0.2 – −0.5, 0– −0.2 and +0.15 V vs. SCE respectively, while the charge transfer bands characteristic of the complexes were found at 26–28×103, 24.5–25×103 and ∼23.5×103 cm−1respectively. It was found that a linear correlation exists between the reduction potentials and the CT frequencies of the complexes.
POLYMERIZATION OF BENZENE WITH Cu(AlCl4)2
Authors: Kitajima Nobumasa , Hakone Yoshiaki , Ono Yoshio
Published: July 2006

Cu(AlCl4)2 reacts with benzene to give poly(1,4-phenylene). When 2.5 mmol of benzene was reacted with 2.5 mmol of Cu(AlCl4)2 at 20°C for 2 h, poly(1,4-phenylene) was obtained in 92 % yield, which is higher than that obtained with the conventional system, AlCl3–CuCl2 mixture, under the same conditions.
SYNTHETIC APPLICATION OF THIOSILANES TO THIOESTERS
Authors: Ando Wataru , Furuhata Toshiya , Tsumaki Hidetoshi , Sekiguchi Akira
Published: July 2006

Thiosilanes such as ethylthiotrimethylsilane, hexamethyldisilthiane, and t-butylthiotrimethylsilane, react readily with acyl chlorides at room temperature in the presence of potassium fluoride to give the corresponding thioesters in excellent yields.
A NOVEL REACTION AND MECHANISM OF A DIHALOGENATED Δ4-3-KETOSTEROID: STEREOELECTRONIC CONTROL IN A COMPLICATED SN2′ DISPLACEMENT
Authors: Koga Toshitaka , Toh Namiko , Nogami Yasuyoshi
Published: July 2006

Stereochemistry of the acetolysis of 4,6β-dibromo-Δ4-3-ketosteroicl was examined and a new route of simultaneous introduction of two O-functions at C-2 and C-6 on the steroid skeleton has been established. The reaction is interpreted to proceed by characteristic and successive SN2′ reaction mechanisms, and stereoelectronic effects control the stereochemistry of the reaction. There is no occurrence of SN1, SN2, and any rearrangement courses.
SYNTHESIS OF Bis(2,2-BIS(ETHYLTHIO)ETHENYL) SULFOXIDE
Authors: Yokoyama Masataka , Hayashi Masahiro , Imamoto Tsuneo
Published: July 2006

(Methylsulfinyl)ketenedithioacetals (3) and alkyl (methylsulfinyl)dithioacetates (4) were prepared from dimethyl sulfoxide. Next, the useful title compound (8) was synthesized from 4.
CONSTITUENTS OF Pluchea sericea. STRUCTURE AND STEREOCHEMISTRY OF (11S)-11,13-DIHYDROTESSARIC ACID
Authors: Vivar Alfonso Romo De , Reyes Benito , Delgado Guillermo , Schlemper Elmer O
Published: July 2006

A chemical investigation of Pluchea sericea (Inuleae, Compositae) afforded the new sesquiterpene, (11S)-11,13-dihydrotessaric acid (7), in addition to tessaric acid (6), quercetin-3′-dimethyl ether (5) and taraxasteryl acetate (4). The structure of the acid (7) was elucidated by chemical transformations as well as spectroscopic methods and X-ray diffraction analysis.
STEREOSELECTIVE PREPARATION OF γ-BUTYROLACTONE DERIVATIVES FROM γ-HYDROXY-α-NITRO-OLEFIN AND ACTIVE METHYLENE COMPOUNDS
Authors: Sakakibara Tohru , Ikeda Yutaka , Miura Toshinari , Sudoh Rokuro
Published: July 2006

Stereoselective preparation of γ-butyrolactone derivatives from 5,5-dimethyl-3-nitrocyclohex-2-en-1-ol and active methylene compounds is described.
SYNTHESIS OF FERROCENOPHANE AND [2] AND [3]FERROCENOPHANE-TIN CHLORIDE ADDUCTS AND THEIR MÖSSBAUER SPECTROSCOPIC STUDIES
Authors: Watanabe Masanobu , Ichikawa Hajime , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

Adducts of tin–tetrachloride with [2]ferrocenophane were prepared by treating SnCl4 with [2]ferrocenophane in hexane. The adducts were studied by means of 57Fe- and 119Sn-Mössbauer spectroscopy and other physicochemical measurements. An anomalously large quadrupole splitting value found in the 57Fe-Mössbauer spectroscopy of the red-orange adduct prepared from [2]ferrocenophane (3.49 mm s−1 at 78 K, 3.45 mm s−1 at 300 K) suggests the presence of a direct chemical bonding between Fe and Sn atoms, whereas the dark green adducts prepared from ferrocene and [3]ferrocenophane consist of ferrocenium and [3]ferrocenophanium cations, respectively.
SYNTHESIS OF A HEAT-STABLE ENTEROTOXIN PRODUCED BY A HUMAN STRAIN OF ENTEROTOXIGENIC Escherichia coli
Authors: Ikemura Haruo , Yoshimura Shoko , Aimoto Saburo , Shimonishi Yasutsugu , Takeda Tae , Takeda Yoshifumi , Miwatani Toshio
Published: July 2006

A heat-stable enterotoxin, produced by a human strain of enterotoxigenic Escherichia coli, was synthesized by a solution method. The synthesized peptide has the same biological and physicochemical properties as those of native toxin.
FRONTIER ORBITAL CONTROL FOR THE HYDROXYL RADICAL ATTACK ON AROMATICS
Authors: Tezuka Takahiro , Ichikawa Kazuhiko , Marusawa Hiroshi , Narita Nozomu
Published: July 2006

The ortho:meta:para isomer ratio and p/m value observed in the aromatic hydroxylation with hydroxyl radical in anhydrous organic media are correlated with the electron density of HOMO of aromatics.
SYSTEMATIC SYNTHESIS OF PURINE 8,5′-IMINO AND SUBSTITUTED IMINO CYCLONUCLEOSIDES
Authors: Sasaki Tadashi , Minamoto Katsumaro , Fujiki Yasumi
Published: July 2006

A systematic synthesis of some purine 8,5′-imino and substituted imino cyclonucleosides has been introduced. Thus, 2′,3′-O-isopropylidene derivatives of 8-methylaminoadenosine, 8-methylaminoinosine, 8-benzylaminoadenosine and 8-benzylaminoinosine with excess diphenyl carbonate/Et3N in DMF gave the corresponding 8,5′substituted imino cyclonucleosides. These were converted to the debenzylated derivatives or to 8,5′-methylimino cycloadenosine.
GENERATION AND REACTIONS OF THE ALLYLIC CARBANION SPECIES FROM 2-METHYL-3-(PHENYLTHIO)PROPENOIC ACID DERIVATIVES
Authors: Kitaoka Masaki , Takahashi Yasuhiro , Kosugi Hiroshi , Uda Hisashi
Published: July 2006

(Z)-2-Methyl-3-(phenylthio) propenoic acid and (E)-N-t-butyl-2-methyl-3-(phenylthio) propenamide produce selectively the corresponding allylic carbanion species, which react with aldehydes and ketones. The same carbanion species are also generated from 2-(phenylthiomethyl)propenoic acid and its N-t-butyl amide.
SYNTHESIS OF SILYLDIAZOKETONES FROM LITHIUM PENTAMETHYLDISILANYLDIAZOMETHANE WITH ACID CHLORIDES
Authors: Sekiguchi Akira , Sato Takashi , Ando Wataru
Published: July 2006

Lithium pentamethyldisilanyldiazomethane, prepared from pentamethyldisilanyldiazomethane and lithium diisopropylamide, reacts with acid chlorides to give pentamethyldisilanyldiazoketones in good yields.
EXAFS STUDY ON THE LOCAL STRUCTURE CHANGES AROUND Ni ATOM DURING THE COURSES OF Ni/SiO2 CATALYST PREPARATION PROCEDURES
Authors: Tanabe Shuji , Ueno Akifumi , Tohji Kazuyuki , Udagawa Yasuo
Published: July 2006

The changes of local structures around Ni atom were studied by means of EXAFS spectroscopy at every elementary step of two kinds of Ni/SiO2 catalyst preparation methods. From the analysis of EXAFS spectra, complemented by the observations by an electron microscope, differences by the structure of intermediate products by the two preparation methods have been revealed.
PHOTOREDUCTION OF CARBON DIOXIDE TO FORMIC ACID MEDIATED BY A METHYLVIOLOGEN ELECTRON RELAY
Authors: Kitamura Noboru , Tazuke Shigeo
Published: July 2006

Carbon dioxide was photochemically reduced to formic acid in the aqueous system of tris(2,2′-bipyridine)ruthenium(II)-methylviologen-triethanolamine under carbon dioxide atmosphere. Photoirradiation of the system for 4 h gave 4.5×10−3 M of formic acid (quantum yield (Ψ) ≈0.01) as determined by isotachophoresis.
CRYSTAL STRUCTURES OF THE o-, THE m-, AND THE p-TOLUIDINE CLATHRATES IN BISDIMETHYLAMINECADMIUM(II) TETRACYANONICKELATE(II) HOST
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake
Published: July 2006

The crystal structures of three clathrates Cd(NH(CH3)2)2Ni(CN)4.G (G = o-CH3C6H4NH2, m-CH3C6H4NH2, and p-CH3C6H4NH2) have been analyzed by single crystal X-ray diffraction method. The structures are substantially similar to one another, although the way of puckering in the two-dimensional metal cyanide network in the host structure of the o-isomer clathrate is different from the two others.
THE REDUCTIVE COUPLING REACTION OF DIARYLIODONIUM SALTS CATALYZED BY PALLADIUM–ZINC SYSTEM
Authors: Uchiyama Masaharu , Suzuki Takehiko , Yamazaki Yasuo
Published: July 2006

Biaryls are readily obtained in good yields by reductive coupling reactions of various diaryliodonium salts in the presence of zinc and a palladium catalyst under mild conditions.
PARAMAGNETIC SHIFT AND LIGAND EXCHANGE IN URANIUM(V)-DMF COMPLEX
Authors: Harazono Toshie , Tomiyasu Hiroshi , Fukutomi Hiroshi
Published: July 2006

The rate of ligand exchange in a U(V)-DMF complex was determined for the first time in N,N-dimethylformamide(DMF) at temperatures below −40°C by using the 1H NMR method. The paramagnetic shift by U(V) was also observed in the 1H and 13C NMR signals of bulk DMF owing to the fast exchange between the first coordination sphere of U(V) and the bulk solvent at 25°C.
CARBOXYLATION OF 1,3-DIMETHYLURACIL AND THIOPHENES WITH CARBON MONOXIDE AND PALLADIUM(II) ACETATE IN THE PRESENCE OF SODIUM PEROXODISULFATE
Authors: Itahara Toshio
Published: July 2006

Treatments of 1,3-dimethyluracil and of thiophenes with palladium(II) acetate and sodium peroxodisulfate under a carbon monoxide atmosphere gave 1,3-dimethyluracil-5-carboxylic acid and the corresponding thiophene-2-carboxylic acids, respectively.
A SHORT-STEP SYNTHESIS OF ANTIBIOTIC A26771B UTILIZING THE RING-OPENING REACTION OF β-ETHYNYL-β-PROPIOLACTONE
Authors: Fujisawa Tamotsu , Okada Nobuki , Takeuchi Masashi , Sato Toshio
Published: July 2006

The total synthesis of antibiotic A26771B was completed in short steps from 15-hydroxy-3,4-hexadecadienoic acid which was easily prepared by the ring-opening reaction of β-ethynyl-β-propiolactone with Grignard reagent in the presence of a copper(I) catalyst.
STEREOSELECTIVE SYNTHESIS OF BIOTIN PRECURSOR
Authors: Kinoshita Hideki , Futagami Masato , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

Stereoselective synthesis of N,N′-dibenzyl-cis-ureylenetetrahydrothiophene as a precursor of biotin starting from the imidoyl chloride derivative readily prepared from the reaction of 3-sulfolene with sulfuryl chloride in acetonitrile was described.
57Fe NMR OF IRON(II) LOW SPIN HEMES
Authors: Nozawa Tsunenori , Sato Mitsuo , Hatano Masahiro , Kobayashi Nagao , Osa Tetsuo
Published: July 2006

57Fe NMR signals were obtained by using a steady-state free precession method for a bis(pyridine) complex of [15N4,57Fe]-meso-tetraphenylporphine and a bis(pyrrolidine) complex of [15N4,57Fe]-meso-p-tolylporphine at 7260 and 7340 ppm low field from that of pentacarbonyliron (0) (Fe(CO)5), respectively.
ELECTROGENERATED ACID AS AN EFFICIENT CATALYST FOR ACETALIZATION OF CARBONYL GROUP WITH 1,2-BISTRIMETHYLSILOXYETHANE
Authors: Torii Sigeru , Inokuchi Tsutomu
Published: July 2006

Electrolysis of a mixture of carbonyl compounds and bistrimethylsiloxyethane in CH2Cl2–LiClO4–(Pt) readily gave the corresponding acetalized products in good yields.
RECONSTITUTED SPERM WHALE MYOGLOBINS WITH IRON AND COBALT COMPLEXES OF CHLORINS
Authors: Takeda Motoru , Aoyagi Katsuhiro , Aoyama Yasuhiro , Ogoshi Hisanobu
Published: July 2006

Reconstituted myoglobins (Mb) with iron and cobalt complexes of chlorins were prepared for the first time. The Fe(II)–Mb’s form oxy-adducts, but the reversibility of oxygen binding is rather poor. The Co(II)–Mb’s prepared under anaerobic conditions bind O2 reversibly. Reconstitution under aerobic conditions leads to Co(III)–myoglobins; Co(II) proteins derived therefrom undergo instantaneous oxidation back to the Co(III) derivatives.
ERYTHRO-SELECTIVE ALDOL CONDENSATION VIA ENAMINOSILANES
Authors: Ando Wataru , Tsumaki Hidetoshi
Published: July 2006

In the presence of BF3·OEt2, enaminosilanes derived from acyclic and cyclic ketones have been shown to undergo erythro selective kinetic aldol condensation.
SYNTHESIS AND STEREOCHEMISTRY OF 2-PYRIDINETHIOLATO ETHYLENEDIAMINE MIXED COMPLEXES OF COBALT(III)
Authors: Kita Masakazu , Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

A series of mixed complexes [Co(pyt)3−n(en)n]n+ (n = 0, 1, and 2) have been newly prepared and characterized by their visible and ultraviolet absorption, circular dichroism, and magnetic circular dichroism spectra (pyt = 2-pyridinethiolato-N,S ligand). In [Co(pyt)3] or [Co(pyt)2(en)]+ complex, only one geometrical isomer, mer(S) or trans(S), has been obtained, respectively.
COMPLEXATION OF “CROWNED” DINITROPHENYLAZOPHENOL WITH ALKALI AND ALKALINE EARTH METAL IONS AND ITS APPLICATION TO THE COLORIMETRIC DETERMINATION OF Rb(I) AND Cs(I)
Authors: Nakashima Kenichiro , Yamawaki Yûko , Nakatsuji Shin’ichi , Akiyama Shuzo , Kaneda Takahiro , Misumi Soichi
Published: July 2006

Complexation of “crowned” dinitrophenylazophenol (CDPA) with alkali and alkaline earth metal ions in CHCl3–MeOH–triethylamine was examined. The ionic radii of these metal ions correlated linearly both with the wave numbers of absorption maxima and with the molar absorption coefficients of the resulting complexes except for Be(II). The colorimetric determination of Rb(I) and Cs(I) by using CDPA was practical.
A NEW STEREOSELECTIVE SYNTHESIS OF VINYLSILANES UTILIZING VINYL SULFONES
Authors: Ochiai Masahito , Ukita Tatsuzo , Fujita Eiichi
Published: July 2006

Vinylsilanes 3 were prepared stereoselectively from vinyl sulfones via the formation of β-tributylstannyl sulfones 2. The stereochemistry of 3 was controlled by the choice of the method for the destannylsulfonation of 2.
A NOVEL PHOTOREARRANGEMENT OF 2,5-DIARYL-1,4-DITHIIN-1,1-DIOXIDE ACCOMPANIED BY EXTRUSION OF SULFUR DIOXIDE
Authors: Kobayashi Keiji , Mutai Kiyoshi
Published: July 2006

Photolysis of the title compound afforded 2,5-diarylthiophene. The mechanism involving the valence isomerization to thioketone was supported by the photolysis in n-butylamine, which gave pyrrole derivatives.
ISOMERIZATION OF TRIFLUOROACETIMIDOYL CHLORIDES AND THEIR 1,3-DIPOLAR CYCLOADDITIONS WITH ELECTRON-DEFICIENT OLEFINS
Authors: Tanaka Kiyoshi , Daikaku Hiroki , Mitsuhashi Keiryo
Published: July 2006

N-Arylmethyltrifluoroacetimidoyl chlorides isomerize to N-(arylmethylene)-1-chloro-2,2,2-trifluoroethylamines in the presence of triethylamine at room temperature and to the corresponding N-trifluoroethylbenzimidoyl chlorides under more drastic conditions. The reactions of the trifluoroacetimidoyl chlorides with methyl acrylate and acrylonitrile give the corresponding 1,3-dipolar cycloadducts.
THE CATALYTIC REDUCTION OF N3− TO NH3 BY THE REDUCED SPECIES OF [Fe4S4L4]2−, [Mo2Fe6S8L9]3− (L = SCH2CH2OH), AND A RELATED ANION IN H2O OR IN MeOH/THF: EVIDENCE FOR THE FORMATION OF N2H2 AND N2H4 AS INTERMEDIATES
Authors: Imasaka Yoshinobu , Tanaka Koji , Tanaka Toshio
Published: July 2006

The N3− ion can be reduced by [Fe4S4L4]2−, [Mo2Fe6S8L9]3− (L=SCH2CH2OH), and [Fe4S4(SPh)4]2− catalytically under the controlled potential electrolysis conditions in H2O or in MeOH/THF (1:1 v/v) to give NH3 and N2 together with H2. The formation of N2H2 and N2H4 was confirmed as intermediates in these reactions.
TOTAL SYNTHESIS OF 6-OXO-GRINDELIC ACID METHYL ESTER
Authors: Kimura Akihiko , Katsumura Shigeo , Isoe Sachihiko
Published: July 2006

The first synthesis of the methyl ester of 6-oxo-grindelic acid (1) from decalone derivative 2 through γ-hydroxyenone 7 was described.
ULTRASOUND-RESPONSIVE PERMEABILITY CONTROL OF BILAYER-COATED CAPSULE MEMBRANES
Authors: Okahata Yoshio , Noguchi Hiroshi
Published: July 2006

Permeation of NaCl from the inner aqueous phase of the bilayer-coated capsule membrane was reversibly regulated by ultrasonic waves. Activation energy data shows that the ultrasonic irradiation makes coating bilayers fluid like a liquid crystalline state and causes the increase of permeation of NaCl.
NOVEL HOST MOLECULES WHICH FORM INCLUSION COMPLEXES WITH ALCOHOLS. EXTRACTION OF ETHANOL FROM ITS AQUEOUS SOLUTION BY THE COMPLEXATION
Authors: Toda Fumio , Tanaka Koichi , Daumas Gerardo Ulibarri , Sanchez Ma Cristina
Published: July 2006

9,10-Dihydroxy-9,10-diphenyl-9,10-dihydroanthracene, 2,5-diarylhydroquinones, and 9-hydroxy-9-(1-propynyl)fluorene and its 2,7-dihalo-analogs were found to form inclusion complexes with various alcohols. By using the complexation, ethanol was extracted from aqueous solution of various concentration.
THE SELECTIVE BOND CLEAVAGE OF d-GLUCOSE AND d-GALACTOSE BY THE TITANIUM(IV) CHLORIDE-CATALYZED PHOTOREACTION
Authors: Sato Tadashi , Takahashi Kazuo , Ichikawa Shuji
Published: July 2006

Photoreaction of d-glucose and d-galactose in methanol in the presence of titanium(IV) chloride induced a selective bond cleavage at the C5–C6 position, and produced pentodialdose derivatives.
SELECTIVE PROTECTION OF CARBONYL COMPOUNDS BY GIRARD’S REAGENT USING SILICA GEL AS A SOLID SUPPORT
Authors: Chihara Teiji , Waniguchi Erika , Wakabayashi Tamie , Taya Kazuo
Published: July 2006

The Girard’s reagent, which gives water-soluble derivatives of carbonyl compounds, was used together with silica gel as a protective reagent of them in a non-aqueous solvent system. Less hindered or more reactive carbonyl compounds were selectively protected by this method in competitive reductions.
NONCYCLIC POLYETHERS WITH TWO o-CARBOXYLPHENYL TERMINAL GROUPS EXHIBITING SELECTIVE TRANSPORT FOR ALKALINE EARTH METAL IONS THROUGH LIQUID MEMBRANES. EFFECT OF THE CONCENTRATION OF HYDROXIDE ION ON THE SELECTIVITY
Authors: Hiratani Kazuhisa , Sugihara Hideki , Taguchi Kazuhiro , Iio Kokoro
Published: July 2006

Three noncyclic polyethers containing o-carboxylphenyl groups as both end ones were synthesized. These synthetic carriers exhibit the selectivity for Ca++ or Ba++ in the competitive transport for Mg++, Ca++, and Ba++ in the source phase adjusted to initial pH 8.28 or 9.10 through liquid membranes. It was also found that the selective transport for alkaline earth metal ions can be changed by the concentration of hydroxide ion added.
REACTION BEHAVIOR OF ALKANES WITH CARBON MONOXIDE IN A HF–SbF5 SOLUTION
Authors: Yoneda Norihiko , Fukuhara Tsuyoshi , Takahashi Yukio , Suzuki Akira
Published: July 2006

The reaction of alkanes with carbon monoxide in a HF–SbF5 solution at 30 °C under atmospheric pressure gave significantly different results from those in the Koch-Haaf reaction of alkenes and alcohols in usual strong acids. The results demonstrated that alkanes react very easily under these conditions with preferential formation of secondary carboxylic acids when the alkane has less than six carbon atoms, while a formation of β-scission products occurs, exclusively, with more than seven carbon atoms.
A NEW METHOD FOR THE STEREOSELECTIVE SYNTHESIS OF β-XYLOFURANOSIDE
Authors: Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

β-Xylofuranosides are stereoselectively synthesized in good yields by the successive treatment of the thiocarbonate, derived from 3,5-di-O-benzyl-d-xylofuranose, with methyl fluorosulfonate and hydroxy compounds in the presence of cesium fluoride.
ACCELERATION OF SINTERING BY FORCED REDOX CYCLE
Authors: Komai Shinichi , Hattori Tadashi , Miyamoto Akira , Murakami Yuichi
Published: July 2006

The effect of redox atmosphere on the sintering of CuO/SiO2 catalyst was investigated. The sintering was accelerated, when the catalyst was used in catalytic oxidation of ethylene. Further acceleration was observed in the periodic pulse reaction. Redox cycle, especiaaly, forced redox cycle may accelerate the sintering.
REGIOSELECTIVE SYNTHESIS OF 3-ALKENYLSILANES AND 3-ALKENYLSTANNANES BY SILICON- AND TIN-DIRECTED ELIMINATION FROM γ-SILYL AND γ-STANNYL SUBSTITUTED SULFOXIDES AND SULFILIMINES1)
Authors: Hosomi Akira , Inaba Masahiro , Sakurai Hideki
Published: July 2006

3-Alkenylsilanes and 3-alkenylstannanes are conveniently prepared by the silicon- and tin-directed regioselective elimination of sulfenic acid and sulfenamide from γ-silyl and γ-stannyl substituted sulfoxides and sulfilimines.
TOTAL SYNTHESIS OF (±)-AKLAVINONE VIA BIOMIMETIC ROUTE. APPLICATION OF AN EFFICIENT “ZIPPER” REACTION—STEREOCONTROLLED ONE-STEP BICYCLO-CYCLIZATION
Authors: Maruyama Kazuhiro , Uno Hidemitsu , Naruta Yoshinori
Published: July 2006

(±)-Aklavinone (1) was synthesized from tricarbonylnaphthalene derivative 6 by application of an efficient “zipper” reaction in a good yield. Using Kryptofix 222 (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo [8.8.8]hexacosane) in the key process of the reaction we attained a stereocontrolled one-step bicyclo-cyclization.
MÖSSBAUER STUDIES OF BRIDGED FERROCENOPHANE DERIVATIVE’S POLYIODIDES
Authors: Watanabe Masanobu , Sato Kumiko , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

[2]Ferrocenophanes, the ring tilted ferrocene derivatives, were oxidized with iodine in benzene and studied by means of Mössbauer spectroscopy. The quadrupole splitting value of the compounds is found to be 3.70 mms−1 at 78 K, which is one of the largest found in ferrocene derivatives, suggesting the presence of a strong direct interaction between iron atoms and iodine atoms. The results were compared with [3] and [4] ferrocenophane’s polyiodides.
EFFICIENT ASYMMETRIC INDUCTION VIA COORDINATION OF CHIRAL DIAMINE TO TIN(II) ENOLATE: A HIGHLY ENANTIOSELECTIVE SYNTHESIS OF 2-SUBSTITUTED MALATES
Authors: Stevens Rodney W , Mukaiyama Teruaki
Published: July 2006

In the presence of chiral diamine, (2S)-1-methyl-2-[(N-1-naphthylamino)methyl]pyrrolidine, the tin(II) enolate of 3-acetylthiazolidine-2-thione reacts with various α-ketoesters to afford the corresponding aldol-type products, generally, in greater than 95% enantiomeric excess.
METAL DEPOSITS ON Ni–Mo CATALYST USED FOR COAL LIQUEFACTION
Authors: Shimada Hiromichi , Sato Toshio , Kurita Minoru , Yoshimura Yuji , Kobayashi Yoshinori , Nishijima Akio
Published: July 2006

The characterization of Nio–MoO3–Al2O3 catalyst used for coal liquefaction was performed using some spectrometers. Behaviors of metal elements deposited on the catalyst, such as Fe, Ti, Ca, and Na, were clarified in this work.