bluuebunny/crossref_metadata_2025 huggingface dataset:
PREPARATION OF THE ISOMERS OF BIS(l-METHIONINATO)COBALT(III) BROMIDE
Authors: Hidaka Jinsai , Yamada Shoichi , Shimura Yoichi
Published: July 2006

Bis(l-methioninato)cobalt(III) complex was prepared and separated into three isomers, and their absorption and CD curves were presented. The geometrical configurations of three isomers were assigned mainly on the basis of their absorption spectra. The pmr spectra were discussed in relation to another type of isomerism with respect to the configurations of ligand sulfur atoms after coordination.
NEW SYNTHESES OF β-ALKOXY KETONES AND β-KETO ACETALS
Authors: Mukaiyama Teruaki , Hayashi Masatoshi
Published: July 2006

It was found that trimethylsilyl enol ethers derived from aldehydes and ketones react smoothly with acetals or methyl orthoformate at −78°C in the presence of TiCl4, to give β-alkoxy ketones or β-keto acetals, respectively, in good yields.
CARBOXYLATION OF ACTIVE METHYLENE COMPOUNDS USING THE REAGENT OF 1,8-DIAZABICYCLO(5.4.0)-7-UNDECENE AND CARBON DIOXIDE
Authors: Haruki Eiichi , Arakawa Munekazu , Matsumura Noboru , Otsuji Yoshio , Imoto Eiji
Published: July 2006

Various active methylene compounds were carboxylated by employing the reagent system, 1,8-diazabicyclo(5.4.0)-7-undecene and carbon dioxide, in organic solvents or without solvent at room temperature.
OXYGEN-18 TRACER STUDY OF THE REARRANGEMENT OF O-BENZOYL-N-(p-TOLUENESULFONYL)ARYLHYDROXYLAMINES
Authors: Oae Shigeru , Sakurai Tadamitsu , Kimura Hirokazu , Kozuka Seizi
Published: July 2006

O-Benzoyl-N-(p-toluenesulfonyl)arylhydroxylamines (I) were found to rearrange thermally giving o-acyloxy-p-toluenesulfonanilides (II) in quantitative yields. An intramolecular concerted cyclic process has been suggested for the rearrangement on the basis of 18O tracer study. The solvent and the substituent effects on the mechanism of this novel 1,3-acyloxy migration were also examined.
STRUCTURE OF ALOENIN, A BITTER GLUCOSIDE FROM ALOE SPECIES
Authors: Suga Takayuki , Hirata Toshifumi , Tori Kazuo
Published: July 2006

The structure of aloenin, a bitter glucoside from Aloe species, has been reinvestigated and elucidated to be 6-(2′-β-d-glucopyranosyloxy-4′-hydroxy-6′-methyl)phenyl-4-methoxy-2-pyrone (2) by a combination of the chemical and spectroscopic methods.
HYDROGENATION OF ALKENES BY THE COMPLEX OF CROSS-LINKED POLYACRYLIC ACID WITH RHODIUM(111)
Authors: Nakamura Yoshio , Hirai Hidefumi
Published: July 2006

The complex of cross-linked polyacrylic acid with rhodium(111) catalyzes the heterogeneous hydrogenation of terminal and internal alkenes in polar solvents at 30°C under an atmospheric hydrogen pressure. The C=C double bonds can be hydrogenated selectively by the complex catalyst for the hydrogenation of the alkenes with carbonyl and aromatic groups.
THE MICROWAVE SPECTRA OF HALOMETHYL-METHYLETHERS
Authors: Hayashi Michiro , Kuwada Kazunori , Imaishi Hisae
Published: July 2006

The microwave spectra of chloromethyl- and bromomethyl-methylether in the gauche form were studied in relation to their molecular structures and quadrupole coupling constant tensors, X, for six isotopic species. The X tensor elements were obtained from the hyperfine structures of the observed spectra.
CONVERSION OF DEHYDROABIETIC ACID INTO A STEROID SKELETON: FORMATION OF THE A-RING
Authors: Harigaya Yoshihiro , Onda Masayuki , Tahara Akira
Published: July 2006

Conversion of dehydroabietic acid (1) to a steroid skeleton was attempted, and the synthesis of 3-oxo compound (22) was successfully completed via the intermediates (8 and 9) by two methods.
ISOMERIZATION OF 1-METHYLCYCLOHEXENE OXIDE OVER SOLID ACIDS AND BASES
Authors: Arata Kazushi , Tanabe Kozo
Published: July 2006

The isomerization was carried out over metal oxides, sulfates and perchlorates in toluene at 108°C, and the selectivities were found to be strikingly different. SiO2–Al2O3, solid H3PO4 and LiCIO4 formed almost 100% ketone, while TiO2 and Al2O3 gave more than 80% allyl alcohol. Only NiSO4 produced both products.
STEREOSPECIFIC COORDINATION OF SOME OPTICALLY ACTIVE TETRAMINES TO NICKEL(II) ION
Authors: Kitagawa Sadao , Murakami Tasuku , Hatano Masahiro
Published: July 2006

The nickel(II) complexes of optically active tetramines having two pyrrolidinyl groups in each molecules were investigated. 1,2-Bis[2(S)-2-aminomethyl-1-pyrrolidinyl]ethane and 1,2-bis[2-(S)-2-N-methylaminomethyl-1-pyrrolidinyl]ethane formed octahedral complexes, while N,N′-bis[2(S)-2-pyrrolidinylmethyl]-1,2-ethylenediamine and N,N′-bis[2(S)-2-pyrrolidinylmethyl]-1(R),2(R)-cyclohexanediamine formed square planar ones.
PREPARATION AND UV SPECTRA OF SOME OLIGOMER-COMPLEXES COMPOSED OF PLATINUM GROUP METALS AND CONJUGATED POLY-YNE SYSTEMS
Authors: Fujikura Yoshiaki , Sonogashira Kenkichi , Hagihara Nobue
Published: July 2006

The long straight-line oligomer complexes (1) and (2), composed of metal atoms of the platinum group and conjugated poly-yne systems, and the shorter chain members of the series, (3)∼(6), were prepared and their UV spectra were studied.
OXIDATIVE ADDITION OF 4,4,6-TRIMETHYL-1,3,2-DIOXABORINANE AND BENZO[1,3,2]DIOXABOROLE TO TRIS(TRIPHENYLPHOSPHINE)HALOGENORHODIUM
Authors: Kono Hiromichi , Ito Kazushi , Nagai Yoichiro
Published: July 2006

Oxidative addition of 4,4,6-trimethyl-1,3,2-dioxaborinane and benzo[1,3,2]dioxaborole to (Ph3P)3RhX, where X= Cl or Br, gives σ-metalloborne which reacts with triethylsilane to afford quantitatively Et3SiRhHX(PPh3)2.
DECOMPOSITION OF ALIPHATIC SULFIDES IN MOLTEN SALT MEDIA
Authors: Kikkawa Shoichi , Nomura Masakatsu , Sugihara Yoshito
Published: July 2006

The decomposition reaction of aliphatic sulfides was carried out in molten salt media employing a flow system. ZnCl2–LiCl, ZnCl2–KCl (or ZnCl2–KCl–NaCl), and ZnCl2–SnCl2 eutectics showed strong activity in decomposition of the sulfide with the predominant formation of olefin corresponding to the alkyl group of the sulfide and the fixation of sulfur as ZnS in the molten salts.
STRUCTURAL ANALYSIS IN CONTINUOUS SILICON CARBIDE FIBER OF HIGH TENSILE STRENGTH
Authors: Yajima Seishi , Okamura Kiyohito , Hayashi Josaburo
Published: July 2006

The starting material of a continuous silicon carbide fiber with very high tensile strength is a polycarbosilane. It begins to decompose from 300°C in vacuum and is gradually converted into a β-silicon carbide fiber by the heat-treatment at the temperature above 800°C.
AMINOALUMINUM HYDRIDE AS NEW REDUCING AGENTS. II. SELECTIVE REDUCTION OF ESTERS OF CARBOXYLIC ACIDS TO ALDEHYDES
Authors: Muraki Masayoshi , Mukaiyama Teruaki
Published: July 2006

It was found that esters of carboxylic acids are reduced to the corresponding aldehydes in good yields by diaminoaluminum hydrides such as bis (4-methyl-1-piperazinyl) aluminum hydride and dimorpholinoaluminum hydride at room temperature or under refluxing.
THE VAPOR-PHASE HIDROCHLORINATION OF ACETYLENE OVER METAL CHLORIDES SUPPORTED ON ACTIVATED CARBON
Authors: Shinoda Kiyonori
Published: July 2006

The hydrochlorination of acetylene over a series of metal chlorides supported on activated carbon was carried out at 200°C. The catalytic activity of metal chloride was correlated to the electron affinity of metal cation with two straight lines.
THE PHOTOCHEMICAL ISOMERIZATION OF THE PYRIDINE-2-ALDEHYDE 4-NITROPHENYLHYDRAZONE
Authors: Condorelli Giuseppe , Costanzo L Laura , Alicata Luigi , Giuffrida Antonino
Published: July 2006

syn-anti Photoisomerization of 4-nitrophenylhydrazone of pyri dine-2-aldehyde by direct and benzophenone sensitized excitation has been investigated.

For direct irradiation, the syn-isomer undergoes complete iso merization to anti ; for sensitized irradiation,a photoequilibrium state between two isomers is obtained.

Two different mechanisms are proposed.
SYNTHESIS OF AND CATALYSIS BY DEXTRAN-BOUND Mo-CYSTEINE COMPLEX
Authors: Suzuki Hisashi , Meshitsuka Shunsuke , Takashima Toshiyuki , Ichikawa Masaru
Published: July 2006

Cysteine was bound to the dextran polymer. The dextran-bound cysteine formed with Mo5+ a binuclear complex, which had a similar structure to free Mo-Cys complex. The dextran-bound Mo(V)-Cys complex exhibited a much higher catalytic activity for the reduction of acetylene with NaBH4 compared with the free Mo-Cys complex.
A NEW METHOD FOR THE PREPARATION OF UNSYMMETRICAL ETHERS. THE REACTION OF ALKYL 2,4-DICHLOROPHENYL ACETALS WITH GRIGNARD REAGENTS ACTIVATED BY TiCl4
Authors: Ishikawa Hiroshi , Mukaiyama Teruaki
Published: July 2006

It was found that, in the presence of TiCl4, alkyl 2,4-dichlorophenyl acetals react with Grignard reagents to give the corresponding unsymmetrical ethers in high yields.
ELECTRONIC SWITCHING IN DIBENZO-18-CROWN-6 THIN FILM
Authors: Sakai Yoshiro , Sadaoka Yoshihiko
Published: July 2006

Field-induced switching between a high impedance state and a low impedance state was observed in a pure dibenzo-18-crown-6 film sandwiched between evaporated silver electrodes. The frequency dependence of ac conductivity in the high impedance state was interpreted in terms of hopping charge transport.
THE SYNTHESIS OF ALANYL-α-AMINOPROPIONITRILES-(Dl-dl, L-DL, and L-L) BY DEHYDRATING THE CORRESPONDING N-o-NITROPHENYLSULFENYLALANYLALANINE AMIDES
Authors: Kawashiro Katsuhiro , Yoshida Hideyuki , Morimoto Shiro
Published: July 2006

N-o-Nitrophenylsulfenylalanylalanine amides(Dl-dl, L-DL, and L-L) were dehydrated In POCl3-pyridine without affecting their N-protecting groups. The N-protected dipeptide nitriles obtained were treated with anhydrous HCl in ethyl acetate to give the hydrochlorides of the corresponding dipeptide nitriles. The results of ion exchange chromatography of these products Indicated that the optical purity of the α-aminopropionitrile group was well retained.
IDENTIFICATION OF ASPARAGUSIC ACID AS A NEMATICIDE OCCURRING NATURALLY IN THE ROOTS OF ASPARAGUS
Authors: Takasugi Mitsuo , Yachida Youichi , Anetai Masaki , Masamune Tadashi , Kegasawa Kazuo
Published: July 2006

A nematicidal constituent, present at least at 35 ppm, was isolated from the roots of asparagus and identified as asparagusic acid, which has also been reported to exist in the edible part of the plant. The acid was toxic to several plant parasitic nematodes and would be a major factor in resistance of asparagus.
NEW TYPE OF MESOIONIC SYSTEM. 1,3-DIPOLAR CYCLOADDITION OF ISOMUNCHNON WITH ETHYLENIC COMPOUNDS
Authors: Hamaguchi Masashi , Ibata Toshikazu
Published: July 2006

Treatment of anhydro-4-hydroxy-l,3-oxazolium hydroxide (2; named isomünchnon) with ethylenic dipolarophiles gave 1,3-dipolar cycloadducts in high yields. Stereochemistry of these cycloadducts was confirmed by the investigation of nmr coupling constants.
A CONVENIENT SYNTHESIS OF SELENONIUM YLIDES
Authors: Tamagaki Seizo , Sakaki Keishi
Published: July 2006

The treatment of selenonium N-p-toluenesulfonimides and selenoxides except diphenyl selenoxide with active methylene compounds readily afforded the corresponding stable selenonium ylides in relatively high yields.
A CONVENIENT METHOD FOR THE SYNTHESIS OF FURAN DERIVATIVES
Authors: Mukaiyama Teruaki , Ishihara Hideharu , Inomata Katsuhiko
Published: July 2006

It was found that furan derivatives are synthesized in good yields from β-alkoxy-γ-bromoketones formed by the TiCl4-promoted reaction of α-bromoacetals with silyl enol ethers.
A CONVENIENT METHOD FOR THE SYNTHESIS OF 2-(1-ALKENYL)-2-CYCLOPENTENONES
Authors: Ishihara Hideharu , Inomata Katsuhiko , Mukaiyama Teruaki
Published: July 2006

It was found that 2-(1-alkenyl)-2-cyclopentenones were synthesized in good yields from β-alkoxy-γ-bromoketones formed by the TiCl4-promoted reaction of α-bromoacetals with 1-trimethylsiloxy-1-cyclopentene.
O-ACETYL-N-(N′-BENZOYL-l-PHENYLALANYL)-l-PHENYLALANINOL. ISOLATION FROM EUPHORBIA FISCHERIANA STEUDEL
Authors: Uemura Daisuke , Sugiura Kimio , Hirata Yoshimasa
Published: July 2006

O-Acetyl-N-(N′-benzoyl-l-phenylalanyl)-l-phenylalaninol was isolated from Euphorbia fischeriana Steudel. The structure has been established by nmr spectral analysis and the synthesis of this compound.
BROMINATION AND NITRATION OF SOME MIXED LIGAND ACETYLACETONATOCOBALT(III) COMPLEXES
Authors: Yoshitani Kouzou , Kunigita Kazufumi , Watanabe Kiyokatsu , Kuroda Kashiro
Published: July 2006

Four kinds of mixed ligand acetylacetonatocobalt(III) complexes ((NH3)4-, (en)2-, α-trien-, and β-trien-complexes) have been substituted with bromine, and five (the above four and fac(N)-i-DTMA-complex) have been substituted with nitro group at the central methine of the ligand. The brominated and the nitrated complexes have been isolated and identified by means of the electronic absorption spectra and the NMR spectra.
SYNTHESIS AND COMPLEX FORMATION OF MACROMOLECULES HAVING TETRATHIOFULVALENE STRUCTURE
Authors: Ueno Yoshio , Masuyama Yoshiro , Okawara Makoto
Published: July 2006

The new polymer containing tetrathiofulvalene (TTF) structure was synthesized by coupling of polymethylene-bis-4-(1,3-dithiole-2-thione) with base and charge transfer (CT) complex formation of them with tetracyano-p-quinodimethane (TCNQ) and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) was examined.
AZAFULVENES 1. A NOVEL GENERATIVE METHOD OF 6-AMINO-1-AZAFULVENE AND ITS CYCLOADDITION REACTION WITH ISOCYANATE AND ISOTHIOCYANATE
Authors: Watanabe Masanori , Kobayashi Takashi , Kajigaeshi Shoji , Kanemasa Shuji
Published: July 2006

Pyrrole-2-carboxaldehyde reacted with sec. amines affording dipyrrolo[1,2-a:1′,2′-d]pyrazines which corresponded to the dimers of 6-amino-1-azafulvenes. Pyrolytic decomposition of the pyrazine derivatives in the presence of dienophiles such as phenyl isocyanate, phenylisothiocyanate and benzoyl isocyanate gave pyrrolo[1,2-c]imidazoles. These results can be interpreted by the initial formation of 6-amino-1-azafulvenes on pyrolysis following the [6+2]cycloaddition reactions with dienophiles.
SYNTHESIS OF SEVERAL SIMPLE PHENAFULVENES AND SOME ADDITION REACTIONS OF PHENAFULVENE DERIVATIVES
Authors: Morita Noboru , Asao Toyonobu
Published: July 2006

Phenafulvenes substituted at 10-positions with methyl and/or chloro groups have been synthesized in good yields by the reaction of phenalenone with methyl and/or chloro ketenes. Oxygenations of 10,10-dimethyl- and 10,10-diphenylphenafulvenes afforded epidioxides and cleavage of the oxides gave 8-substituted phenalenones. Diels–Alder reactions of 10,10-dimethylphenafulvene yielded the corresponding adducts at C-8 and C-10 positions.
ANOMALOUS ACTIVATION ENERGY OF THERMAL 1,5-HYDROGEN SHIFT IN 1,2-BENZOTROPILIDENE
Authors: Hashimoto Kazunobu , Amano Akira
Published: July 2006

Activation energy of approximately 10 kcal/mol higher than that usually encountered in 1,5-hydrogen shifts in acyclic and cyclic 1,3-dienes was observed in the gas phase thermal reaction of 1,2-benzotropilidene. The value is attributable to the intermediary formation of 4,5-benzotropilidene in which aromatic resonance is not fully developed.
NUCLEAR QUADRUPOLE RESONANCES OF AlBr3·SbBr3, AlI3·SbI3, AND AlBr3·BiBr3
Authors: Okuda Tsutomu , Yamada Koji , Ishihara Hideta , Negita Hisao
Published: July 2006

The NQR spectra and their Zeeman effects in AlX3·SbX3 (X=Br, I) and AlBr3·BiBr3 were observed. The former adducts consist of AlX4− and SbX2+, although there are weak bonds between SbX2+ and AlX4− ions through the halogens of AlX4− ion. On the other hand, AlBr3·BiBr3 shows somewhat different feature compared with the formers.
INVESTIGATION ON CROSS-OVER COMPLEXES. MAGNETIC PROPERTIES OF IRON(III) COMPLEXES WITH SEVERAL SCHIFF BASES
Authors: Nishida Yuzo , Oshio Shuhei , Kida Sigeo
Published: July 2006

Iron(III) complexes with several tetradentate Schiff Bases [FeLXY]n+ and [Fe salen CN] were synthesized, where L is a tetradentate Schiff Base including salen = NN′-ethylenebis(salicylideneiminate), X and Y represent imidazole and cyanide ion. Magnetic susceptibilities and ESR spectra were measured for these complexes from liquid nitrogen to room temperatures. The results have revealed that those complexes consist of four types in view of the spin states, that is high-spin (S = 5/2), low-spin (S = 1/2), intermediate (S = 3/2) and spin-equilibrium (S = 1/2 \ightleftarrowsS = 5/2) states.
RESONANCE RAMAN SCATTERING FROM HEMOPROTEINS: THE NATURE OF THE BOND BETWEEN THE SIXTH LIGAND AND THE HEME IRON IN FERROUS LOW SPIN DERIVATIVES OF HEMOGLOBIN
Authors: Kitagawa Teizo , Iizuka Tetsutaro , Saito Masao , Kyogoku Yoshimasa
Published: July 2006

Classification of the Raman spectra of various hemoproteins including HbNO and HbCNC2H5 suggests that there are two kinds of ferrous low spin states. They are specified by the binding nature of the sixth ligand (L) to heme iron. The Fe–L bond in HbNO and HbCNC2H5 as well as in HbCO and HbO2 is of π type while that in ferrous cytochromes b5 and c is of σ type.
A NEW METHOD FOR THE SYNTHESIS OF 3-ALKYLFURAN AND 2,4-DIALKYLFURAN
Authors: Taguchi Takeo , Okamura Hisashi , Takei Hisashi
Published: July 2006

A convenient method for the preparations of 3-alkylfuran and 2,4-dialkylfuran has been established via three step-procedures starting from α-(alkylthio)carbonyl compounds.
THE SYNTHESIS AND REACTION OF α,α-BIS(PHENYLTHIO)-γ-BUTYROLACTONE. A CONVENIENT METHOD FOR THE PREPARATION OF 3-SUBSTITUTED 2-BUTEN-4-OLIDE
Authors: Watanabe Mikio , Shirai Kozo , Kumamoto Takanobu
Published: July 2006

The reaction of γ-butyrolactone with N-phenylthiophthalimide in the presence of lithium diisopropylamide afforded α,α-bis (phenylthio)-γ-butyrolactone 1 in high yield. Further, a convenient method for the preparation of 3-substituted 2-buten-4-olide was established by the use of 1.
CONTINUOUS SILICON CARBIDE FIBER OF HIGH TENSILE STRENGTH
Authors: Yajima Seishi , Hayashi Josaburo , Omori Mamoru
Published: July 2006

Continuous silicon carbide fiber of high-tensile strength (about 350 Kg/mm2) was synthesized by means of the heat-treatment of organosilicon polymer obtained from dodecamethylcyclohexasilane. X-ray analysis and high voltage electron microscopic observations revealed that the obtained continuous fiber is an ultrafine grain structure of β-silicon carbide.
SYNTHESIS OF 4-AMINO-2-HYDROXYBUTYRIC ACIDS
Authors: Sato Hiroko , Kusumi Takenori , Imaye Kiyoto , Kakisawa Hiroshi
Published: July 2006

1,3-Dipolar addition of the nitronic ester 1 to methyl acrylate and methyl crotonate afforded the corresponding adducts, 2 and 6, respectively. These were converted to the 4-amino-2-hydroxybutyric acids, 5 and 8.
PHOTOCHEMICAL TRANSFORMATION OF MERCURIC SULFIDE INTO METHYLMERCURY IN AQUEOUS SOLUTIONS
Authors: Akagi Hirokatsu , Fujita Yuzaburo , Takabatake Eigo
Published: July 2006

Photochemical solubilization and methylation of mercuric sulfide have been studied in aqueous acetic acid solutions. Mercuric sulfide was solubilized gradually and almost completely after three weeks by irradiation with the light of a blacklight lamp. The measurements of methylmercury photo-produced in the aqueous system demonstrated that the rate of the production of methylmercury was in good agreement with that of the photo-solubilization of mercuric sulfide.
PHOTOCHEMICAL REACTIONS OF 1-PHENYL-2-PROPYN-1-ONE IN ALCOHOLS: FORMATION OF FURANS
Authors: Nishio Takehiko , Omote Yoshimori
Published: July 2006

Irradiation of 1-phenyl-2-propyn-1-one (1) in various alcohols afforded 2-alkyl-5-phenyl furans (2a–d) via cyclization of the intermediate (4), 1:1-addition product of (1) and each alcohol.
QUENCHING OF THE TRIPLET STATE OF ACETYLENE BY ETHYLENE
Authors: Tsukada Masao
Published: July 2006

It was confirmed that the excited state of acetylene formed in the mercury photosensitized reaction was quenched by ethylene, the excited state being monitored through phosphorescence of biacetyl mixed as a probe. The results provide an estimate on the relative value of the rate constant for the quenching process.
A FACILE AND GENERAL SYNTHESIS OF 4-HYDROXYCYCLOPENTENONES
Authors: Shono Tatsuya , Matsumura Yoshihiro , Hamaguchi Hiroshi , Nakamura Koichi
Published: July 2006

Various rethrolones were prepared in good yields simply from 2,5-disubstituted furans. The electrooxidation of 2,5-disubstituted dihydrofurans gave 2,5-dimethoxy-2,5-disubstituted dihydrofurans. Hydrolysis of electrooxidation products with ion enchange-resin, followed by the treatment with base gave rethrolones. Furthermore, this method was applicable for the synthesis of 2-alkyl-4-hydroxycyclopentenone.
CONFORMATIONS OF N- (α-PHENYLBENZYLIDENE)ANILINES
Authors: Yoshida Masato , Minato Hiroshi , Kobayashi Michio
Published: July 2006

PMR spectra of N- (α-phenylbenzylidene) anilines were analyzed by use of differences in spin-lattice relaxation times on a pulse-FT-NMR spectrometer. The results suggested that both the imino benzene ring and the benzene ring adjacent to the imino benzene ring are greatly rotated out of the molecular plane.
A CONVENIENT METHOD FOR THE TRANSFORMATION OF ALCOHOLS TO ALKYL IODIDES USING 2-FLUOROPYRIDINIUM SALT
Authors: Kobayashi Susumu , Tsutsui Mikio , Mukaiyama Teruaki
Published: July 2006

1-Methyl-2-alkoxypyridinium salts, easily formed in situ from 1-methyl-2-fluoropyridinium salt and alcohols, react with sodium iodide to give the corresponding alkyl iodides in good yields.
LIQUID–LIQUID EXTRACTION OF VARIOUS METAL IONS WITH POLYETHYLENEGLYCOL AND ITS DERIVATIVES
Authors: Sotobayashi Takeshi , Suzuki Toshio , Tonouchi Shigemasa
Published: July 2006

Polyethyleneglycol (PEG) and its derivatives of high molecular weight, including polypropyleneglycol, were found to be used as extractants for the liquid–liquid extraction of small amounts of various metal ions. Their extraction with these extractants were studied from thiocyanate and iodide solutions. The extraction power of these extractants increased with the increasing number of ehtylene-oxide groups in PEG’s. The extractability of metal ions from their thiocyanate solution increased in the following order: Zn(II)>Mo(V)>Co(II)>Fe(III)>V(IV)>Cu(I)>Hg(II)>Cd(II)>Pb(II)>Ni(II)
CONFORMATIONAL ANALYSIS OF β-METHOXY-β-PHENYLETHYLTHALLIUM(III) COMPOUNDS: EVIDENCE FOR TRANS ADDITION IN OXYTHALLATION OF STYRENE
Authors: Kurosawa Hideo , Kitano Ryuichiro , Okawara Rokuro
Published: July 2006

1H NMR conformational analysis of the title compounds derived from styrene and β-styrene-d provided evidence for trans addition in oxythallation of styrene.
REACTION OF TERTIARY PHOSPHINE DICHLORIDES WITH THIOLS IN THE PRESENCE OF TRIETHYLAMINE. A CONVENIENT METHOD FOR THE REDUCTION OF PHOSPHINE OXIDES TO PHOSPHINES
Authors: Masaki Mitsuo , Fukui Kiyoshi
Published: July 2006

The reaction of phosphine dichlorides with 1- or 2-alkanethiols or benzenethiol in the presence of triethylamine and subsequent distillation afforded phosphines and disulfides in good yields. The reaction was shown to be useful for reduction of tertiary phosphine oxides to the corresponding phosphines.
HOMOGENEOUS TRANSFER HYDROGENATION OF KETONES CATALYZED BY MOLYBDENUM COMPLEXES
Authors: Tatsumi Takashi , Kizawa Kazutoshi , Tominaga Hiroo
Published: July 2006

Phosphine complexes of molybdenum, especially bisdinitrogen-bis[1,2-bis(diphenylphosphino)ethane]molybdenum and tetrahydridobis-[1,2-bis(diphenylphosphino)ethane]molybdenum promote transfer hydrogenation of ketones by hydrogen donors, amongst which secondary alcohols are most effective.
ABSOLUTE CONFIGURATION OF AMINOGLYCOSIDE ANTIBIOTICS P-2563 (P) AND (A)
Authors: Nara Kiyoshi , Katamoto Kazuyoshi , Suzuki Shigeru , Akiyama Shunichi , Mizuta Eiji
Published: July 2006

The absolute configuration of the aminopolyol moiety (XI) of the aminoglycoside antibiotics P-2563 (P) (I) and (A) (II) was established to be 2S, 3S, 4R and 5S from the evidence that XI gave methyl 3,6-diacetamido-3,6-dideoxy-α-l-gulopyranoside through the oxidation of the hydroxymethyl group at C-6. From this fact, together with the plane structures of I and II and 13C-NMR studies, the absolute configuration of I and II were elucidated to be 3-O-(4-deoxy-4-propionamido-α-d-glucopyranosyl)-(2S, 3S, 4R, 5S)-1,4-diamino-1,4-dideoxyhexitol and 3-O-(4-acetamido-4-deoxy-α-d-glucopyranosyl)-(2S, 3S, 4R, 5S)-1,4-diamino-1,4-dideoxy-hexitol, respectively.
RAPID REACTION BETWEEN SULFONIUM ION AND SULFIDE. PREPARATIVE REDUCTION OF SULFOXIDE TO SULFIDE
Authors: Tanikaga Rikuhei , Nakayama Koji , Tanaka Kazuhiko , Kaji Aritsune
Published: July 2006

A very rapid oxygen exchange reaction between a sulfoxide and dimethyl sulfide took place with trifluoroacetic anhydride. A plausible mechanism involves the nucleophilic attack of a sulfide on a sulfonium sulfur atom. From these findings a convenient method for the reduction of a sulfoxide to a sulfide is described.
EFFECT OF WATER STRUCTURE ON POLY-ε-BENZYLOXYCARBONYL-l-LYSINE MONOLAYERS
Authors: Yamashita Takuya , Shibata Akira , Yamashita Shinsuke
Published: July 2006

In relation to the structure of water at the interfacial region, the effects of monovalent anions on the surface pressure-area curves of poly-ε-benzyloxycarbonyl-l-lysine were investigated. The effects of anions on increasing the surface pressure were in the order of SCN−> Br−> Cl−> F− in accordance with that of these anions as breakers of water structure.
REACTION OF TRICYCLO[4.2.2.02,5]DECA-3,7-DIENE DERIVATIVES IN DMSO
Authors: Sasaki Tadashi , Kondo Akihiro
Published: July 2006

Reaction of tricyclo[4.2.2.02,5]deca-3,7-diene derivatives 1 or 2 with DMSO-conc.HCl gave transannular methylthiolactonization product 3 and 3-chloro-4-methylthiotricyclo[4.2.2.02,5]dec-7-ene derivatives 4. Reaction of 1 or 2 with HBF4 in DMSO resulted in the protonation of the cyclohexene double bond. These results have been interpreted as the result of the orbital interaction of electrophile′s LUMO and olefin′s HOMO.
COMPLEX FORMATION BETWEEN [Co(OH)2tren]+ AND DIVALENT METAL IONS
Authors: Fujii Shigeji , Shibahara Takashi , Mori Masayasu
Published: July 2006

The stability constants of complex formation between [Co(OH)2tren]+ as a ligand and some divalent metal ions were determined by Bjerrum’s method. The values of log K1 and log K2 in this order are: Co, 2.85, 3.0; Ni, 3.0, 3.5; Cu, 6.3, 5.0; Zn, 3.6, 3.0; Cd, 2.6, 2.2. Some relevant 1:2 and 1:3 complexes have been isolated as the perchlorates.
STRUCTURE OF COMMENSURATE PEIERLS STATE OF Rb1.67Pt(C2O4)2·1.5H2O
Authors: Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao
Published: July 2006

X-ray examination, chemical analyses and electrical conductivity measurements were made on the partially oxidized platinum complex Rb1.67Pt(C2O4)2·1.5H2O (RbDOX). Sixfold modulated superstructure of RbDOX is confirmed as the newly found commensurate Peierls structure based on the agreement with the period of the Peierls distorted superlattice determined by the degree of partial oxidation.
PREPARATION AND PROPERTIES OF MOLYBDENUM AND TUNGSTEN DINITROGEN COMPLEXES 9. CONVERSION OF THE LIGATING DINITROGEN INTO HYDRAZINE
Authors: Hidai Masanobu , Mizobe Yasushi , Takahashi Tamotsu , Uchida Yasuzo
Published: July 2006

The complex cis-W(N2)2(PMe2Ph)4 or WBr2(NNH2)(PMe2Ph)3 gave 0.60–0.65 mol N2H4/mol W upon treatment with excess of HCl gas in 1,2-dimethoxyethane. Molybdenum diazoalkane complexes MoCl2 (NN=CRR′) (PMe2Ph)3 also afforded hydrazine as the major product in the reaction with HCl gas.
PHOTOELECTROCHEMICAl IMAGING PROCESSES USING SEMICONDUCTOR ELECTRODES
Authors: Inoue Tooru , Fujishima Akira , Honda Kenichi
Published: July 2006

Photoelectrochemical reactions at semiconductor electrodes in the solution with metallic ions have been applied to the reproducible image formation. Photo-images were the oxide layer in the case of an n-type semiconductor electrode and the metal layer in the case of a p-type semiconductor electrode.
A FACILE METHOD FOR THE PREPARATION OF 5-ALKOXY-1,4-DIKETONES
Authors: Kuwajima Isao , Azegami Ichiro , Nakamura Eiichi
Published: July 2006

The title compoun\={a}s were prepared efficiently by Lewis acid catalyzed reaction of 1,2-bis(trimethylsiloxy)-1-cyclobutene with acetals, followed by addition of the Grignard reagent and ring cleavage of the resulting vis-diols with Pb(OAc)4.
METHANATION OF CARBON DIOXIDE AND CARBON MONOXIDE ON SUPPORTED Ni–La2O3–Ru CATALYST
Authors: Inui Tomoyuki , Funabiki Masaki
Published: July 2006

A novel type composite catalyst in which small amounts of La2O3 and Ru are incorporated with Ni substrate supported on a granulated silica having bimodal pore structure, was found to be a very efficient hydrogenation catalyst for selective methane formation from carbon oxides. Contrary to the case of Ni, the rate of CO2methanation on the presented catalyst was greater than that of CO methanation.
THE SELECTIVE SYNTHESIS OF 1,5-DISUBSTITUTED PYRAZOLES AND STRUCTURAL ELUCIDATION OF 1,3- AND 1,5-DISUBSTITUTED PYRAZOLES
Authors: Tamaru Yoshinao , Harada Toshiro , Yoshida Zen-ichi
Published: July 2006

1,5-Disubstituted pyrazoles with a bulky group at 5-position is synthesized selectively from a monosubstituted hydrazine and a 1,3-dicarbonyl derivative. The structures of the positional isomers (1,3- and 1,5-disubstituted pyrazoles) are determined unambiguously by the C13 NMR study.
DETECTION OF ANIONIC POLYACRYLAMIDE BY GPC
Authors: Furusawa Kunio , Onda Nobuhiko , Yamaguchi Noriko
Published: July 2006

By addition of a salt to the eluent, the large increase was observed for the elution volume of the partially hydrolyzed polyacrylamide. This feature was applied to the detection and the separation of the anionic polymers in the technical products of polyacrylamide.
PREPARATION OF OLEFINS BY REDUCTIVE ELIMINATION OF β-HYDROXYSULFIDES USING 2-FLUOROPYRIDINIUM SALT AND LITHIUM IODIDE
Authors: Mukaiyama Teruaki , Imaoka Masanori
Published: July 2006

Various olefins were prepared in good yields by reductive elimination of α-hydroxysulfides (1) with 1-ethyl-2-fluoropyridinium tetrafluoroborate (2) and lithium iodide.
REACTION OF 2,3-DIHYDRO-2,3-EPOXY-1,4-NAPHTHOQUINONE WITH ALLYLTRIBUTYLTIN. DIRECT ALLYLATION OF EPOXYQUINONE NUCLEUS
Authors: Maruyama Kazuhiro , Naruta Yoshinori
Published: July 2006

2-Alkyl-2,3-dihydro-2,3-epoxy-1,4-naphthoquinone reacted with allyltributyltin and stereo- and regiospecific allylation of its carbonyl was attained giving 3-alkyl-1-allyl-2,3-epoxy-4-oxo-1,2,3,4-tetrahydro-1-naphthol.
PHOTOELECTROCHEMICAL STUDY ON CHLOROPHYLL MONOLAYER ELECTRODES
Authors: Watanabe Tadashi , Miyasaka Tsutomu , Fujishima Akira , Honda Kenichi
Published: July 2006

Anodic photocurrents and negative photovoltages were observed upon irradiation to chlorophyll (Chl) a and b monolayers deposited on SnO2 optically transparent electrodes in an electrochemical cell. Photocurrent quantum efficiency was measured with Chl a-stearic acid mixed monolayers and a highest value of 12–16 % was attained.
MANGANESE PHTHALOCYANINE AS A MODEL OF TRYPTOPHAN-2,3-DIOXYGENASE
Authors: Uchida Kiyoshi , Soma Mitsuyuki , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

High catalytic activity of manganese phthalocyanine, as a model of tryptophan-2,3-dioxygenase, for the oxygenation of 3-methylindole was demonstrated. The substrate specificity for the oxygenation of indole derivatives is markedly different from that by singlet oxygen or radical autoxidation. A reaction mechanism is proposed taking the intimate correlation between the substrate specificity and the electronic spectra of the catalyst–substrate mixture into account.
CARTHAMIN AND ISOCARTHAMIN
Authors: Obara Heitaro , Onodera Jun-ichi
Published: July 2006

Carthamin and isocarthamin, the red pigments of the flowers of Safflower, have been reported hitherto as tautomers. As a result of the reexamination of the relation between the pigments it was found that carthamin is not a tautomer of isocarthamin but pyridine salt of the isocarthamin.
STUDIES ON KETENE AND ITS DERIVATIVES (XCI) REACTION OF DIKETENE WITH ACYL AZIDES
Authors: Kato Tetsuzo , Suzuki Yuji , Sato Masayuki
Published: July 2006

Photoreaction of diketene with benzoyl azide (1a) gave 1-benzoyl-4-hydroxy-3-pyrrolin-2-one (2a). Similarly, diketene reacted with p-anisoyl azide (1b), p-chlorobenzoyl azide (1c), and p-toluoyl azide (1d) to give the corresponding 1-aroyl-4-hydroxy-3-pyrrolin-2-ones (2b,c and d).
POLYMERIC NITROPHENYLSULFENYL CHLORIDE, AN INSOLUBLE AMINO PROTECTING REAGENT IN PEPTIDE SYNTHESIS
Authors: Ito Hisashi , Ogawa Keiichi , Ichikizaki Iwao
Published: July 2006

A polymeric nitrophenylsulfenyl chloride(5) was synthesized and used for amino protection during peptide synthesis. The insoluble protecting group can be selectively removed from the amino derivative with mild acid treatment similarly to o-nitrophenylsulfenyl(Nps) group, and the separation is quite easy due to its insolubility. When the protected derivative is treated with hydrogen chloride for deprotection, the polymeric reagent(5) is regenerated so that it can be used for amino protection repeatedly.
CYCLIZATION OF POLYENES XXX SYNTHESIS OF 2-HYDROXY- AND 1,2-DEHYDRO-7,8-OXIDO-NEPHTENOLS AND CEMBRENOL
Authors: Suzuki Masanobu , Shimada Akihide , Kato Tadahiro
Published: July 2006

The naturally occurring cembrenoids (I, II, and III) were successfully synthesized, demonstrating unequivocally the assigned structure.
THEORETICAL STUDIES ON THE DISTRIBUTION OF THE DAUGHTER FRAGMENTS PRODUCED BY THE β+-DECAY IN 18F-LABELLED METHYLFLUORIDE
Authors: Ikuta Shigeru
Published: July 2006

The β+ -decay in CH318F was theoretically studied with ab initio MO calculation. The transition probability from a parent to the daughter in the ground and various excited states was calculated. The recoil effect as well as the electron shake-off will play an important role for the final products.
“Sb–I–Ca PROCESS” FOR THERMOCHEMICAL HYDROGEN PRODUCTION
Authors: Miura Norio , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

A new thermochemical water-splitting process named “Sb–I–Ca Process” is proposed with relevant thermochemical data and preliminary experimental results. The process consists of basic steps of five reactions and three phase-transitions, each of which proceeds to an acceptable extent. The overall efficiency is estimated to be ca.50 % with an assumption of 70 % heat recovery.
A SIMPLE SYNTHESIS OF α,β-UNSATURATED ALDEHYDES BY THE REACTION OF VINYLSILANES WITH DICHLOROMETHYL METHYL ETHER PROMOTED BY TITANIUM(IV) CHLORIDE. APPLICATION TO THE SYNTHESIS OF ETHYL 12-OXO-10(E)-DODECENOATE AND NUCIFERAL
Authors: Yamamoto Keiji , Yoshitake Junichi , Qui Nguyen Thi , Tsuji Jiro
Published: July 2006

1,2-Disubstituted vinyltrimethylsilanes (1) readily underwent formylation with replacement of the silyl group when treated with dichloromethyl methyl ether and titanium(IV) chloride. This reaction provides a simple procedure for the selective preparation of (E)-2-alkenals (2) and was conveniently applied to the synthesis of ethyl 12-oxo-10(E)-dodecenoate and nuciferal.
NOVEL DINITROGEN–COBALT COMPLEXES [Co(N2)(PR3)3Mg(THF)2] WHICH LIBERATE HYDRAZINE ON HYDROLYSIS
Authors: Miura Yoshikiyo , Yamamoto Akio
Published: July 2006

New dinitrogen–cobalt complexes with the formula of [CoN2(PR3)3Mg(THF)2] (PR3 = PPh3 and PPh2Et) have been obtained by the reaction of CoH(N2)(PPh 3)3 with diethylmagnesium and by the reaction of Co(acac)3, PPh2Et and MgEt2 under nitrogen; the N2 contained in the complexes was found to be converted into hydrazine and a small amount of ammonia on hydrolysis.
THERMOLYSES OF STRAINED 1,2,5-OXADIAZOLES AND 1,2,5-THIADIAZOLES OF THIANORBORNANE SERIES
Authors: Tsuge Otohiko , Takata Toshiaki , Ued Ikuhiko
Published: July 2006

Thermolysis of stereoisomeric 4-oxa-13-thia-3,5,10-triaza-1,7,10-triphenyltetracyclo[5.5.1.02,6.08,12]trideca-2,5-diene-9,11-diones, which are cycloadducts of 4,6-diphenylthieno[3.4-c]-1,2,5-oxadiazole to N-phenylmaleimide, under mild conditions results in ring cleavage of the oxadiazole ring to nitrile and nitrile oxide moieties which can be trapped as 1,3-cycloadducts to dimethyl acetylenedicarboxylate. On the other hand, analogous strained adducts obtained from 4,6-diphenylthieno[3.4-c]-1,2,5-thiadiazole and N-phenylmaleimide undergo a retro-cycloaddition reaction.
DETERMINATION OF METOL AND HYDROQUINONE IN A PHOTOGRAPHIC DEVELOPER BY LIQUID CHROMATOGRAPHY
Authors: Ohno Takashi , Mizusawa Shinya , Takai Nobuharu
Published: July 2006

Metol, hydroquinone and their oxidation products in a photographic developer were satisfactorily analyzed directly by liquid chromatography without any pre-treatment of the developer. The eluent of the liquid chromatography was prepared by eliminating the developing agents from the developer.
NEW GERANYLGERANYLBENZOQUINONE DERIVATIVES FROM SARGASSUM TORTILE
Authors: Ishitsuka Midori , Kusumi Takenori , Nomura Yukihiro , Konno Toshinori , Kakisawa Hiroshi
Published: July 2006

From the brown alga, Sargassum tortile, seven new benzoquinones and hydroquinones bearing diterpenoid side chains were isolated. 2-Geranylgeranyl-6-methylbenzoquinone, which is likely to be a basic substance of the diterpenoid-substituted benzoquinones distributed in many Sargassum species, was also obtained.
PHOTOCHEMICAL REARRANGEMENT OF 3-PHENYLATED 2(3H)-OXEPINONES IN ACIDIC MEDIA. FORMATION OF 5-STYRYL-2(5H)-FURANONES
Authors: Hoshi Nobuto , Hagiwara Hisahiro , Uda Hisashi
Published: July 2006

The sensitized photolysis of 3-phenylated 2(3H)-oxepinones in methylene chloride containing acids gives 5-styryl-2(5H)-furanones as the major products. The 1,5-phenyl migrated products, 7-pheny1-2(7H)-oxepinones, are proposed as the most plausible initial photoproducts.
NEW SESQUITERPENE LACTONES FROM EUPATORIUM CHINENSE VAR. SIMPLICIFOLIUM (MAKINO) KITAM.
Authors: Ito Kazuo , Sakakibara Yoshihisa , Haruna Mitsumasa
Published: July 2006

Five new sesquiterpene lactones, eupachifolin-A, -B, -C, -D, and -E, were isolated from Eupatorium chinense var. simplicifolium (Makino) Kitam. and their structures were described. Eupachifolin-A belongs to the class of cis-Δ4,5,cis-Δ1,10-germacranolides, whereas eupachifolin-B, -C, -D, and -E are mutually related guaianolides. Structures and stereochemistries of the new sesquiterpene lactones were determined by chemical transformations and extensive use of 1H and 13C NMR spectrometry.
STRUCTURE OF CARTHAMIN
Authors: Obara Heitaro , Onodera Jun-ichi
Published: July 2006

The structure 6, 1-(2,6-diketo-3-glucosyl-3,4-dihydroxy-5-p-hydroxycinnamoyl)-cyclohex-4-enylidene-1′-(2′,3′,4′-trihydroxy-3′-glucosyl-5′-p-hydroxycinnamoyl-6′-keto)-cyclohexa-1′,4′-dienylmethane, was assigned for carthamin on the basis of its spectroscopic evidence and hydrolytic behavior.
PREPARATION AND PROPERTIES OF SEVEN-COORDINATE DIMETHYLTIN(IV) AND DIMETHYLLEAD(IV) COMPLEXES: (CH3)2M(pan)(acac) (M = Sn, Pb)
Authors: Kawasaki Yoshikane , Sasaki Torahiko
Published: July 2006

Seven-coordinate dimethyltin(IV) and dimethyllead(IV) complexes, (CH3)2M(pan)(acac) (M = Sn, Pb) , were prepared. In these complexes the acetylacetonato ligand was found to become less labile as compared with that of six-coordinate complexes, (CH3)2M(acac)2 (M = Sn, Pb).
ELECTROCATALYTIC BEHAVIOR OF METAL PORPHYRINS IN THE REDUCTION OF CARBON DIOXIDE
Authors: Takahashi Katsuhiro , Hiratsuka Kazuya , Sasaki Hideo , Toshima Shinobu
Published: July 2006

The catalytic activity of metal porphyrins for the electroreduction of carbon dioxide was investigated by the measurements of current-potential curves on the Hg(Pt) electrode in aqueous electrolytic solutions. Metal-free, cobalt, iron and copper porphyrins(mesotetracarboxyphenylporphyrins, tetraphenylporphinesulfonate) were examined. Cobalt complexes were active but other metal porphyrins showed no activity. The reduction product was confirmed to be formic acid by the resorcinol test.
STRUCTURE AND ACIDITY OF 12-MOLYBDOPHOSPHORIC ACID AND ITS SALTS IN SOLID STATE AS CHARACTERIZED BY INFRARED SPECTROSCOPY
Authors: Furuta Motonobu , Sakata Kanji , Misono Makoto , Yoneda Yukio
Published: July 2006

Presence of water was found to be essential to maintain the Keggin structure of 12-molybdophosphoric acid (PMo12). Hydronium ion was detected by IR at high water contents. PMo12 was almost pure Brönsted acid as seen from IR spectra of adsorbed pyridine. Dependencies of the spectra on time, temperature, and presence of water were discussed in relation to the characteristic surface properties of PMo12.
CATALYTIC ACTIVITY OF MANGANESE NODULE FOR OXIDATIVE DEHYDROGENATION OF ALCOHOLS AND HYDROCARBONS
Authors: Nitta Masahiro , Matsuo Kiyotaka , Aomura Kazuo
Published: July 2006

Various kinds of alcohols and hydrocarbons except chain hydrocarbon are oxidatively dehydrogenated on manganese nodule catalyst. The catalytic activity shows no decrease for long reaction time in the presense of oxygen in the reactant. The surface excess oxygen on manganese nodule is strongly concerned in these reactions as active spieces.
MIXED-LIGAND COMPLEX OF COBALT(III) CONTAINING N,N′-BIS(2-PYRIDYLMETHYL)ETHYLENEDIAMINE AND ETHYLENEDIAMINE
Authors: Utsuno Shunji , Hayashi Arimichi , Kondo Susumu , Utsumi Minoru
Published: July 2006

The title complex was prepared and all the geometrical isomers and the diastreoisomers were separated. The structure of each isomer was assigned in terms of 13C-NMR and CD spectra.
REDUCTION OF β-ALKYLTHIO α,β-UNSATURATED KETONES [R1COCH=C(R2)SR3] WITH LiAlH4 OR NaBH4: CONVERSION TO α,β-UNSATURATED KETONES (R1CH=CHCOR2)
Authors: Nishio Takehiko , Omote Yoshimori
Published: July 2006

Reduction of β-alkylthio α,β-unsaturated ketones [R1COCH=C(R2)SR3] with lithium aluminium hydride (LiAlH4) or sodium borohydride (NaBH4) gave α,β-unsaturated ketones (R1CH=CHCOR2) in moderate yields. In some cases, the saturated γ-hydroxy sulfide is obtained in high yield.
SYNTHESIS OF 7-OXABICYCLO[2.2.1]HEPTANES FROM 3-CYCLOHEXENOLS INVOLVING PHOTO-INDUCED HYPOIODITE REACTION
Authors: Takahashi Hajime , Ito Masaaki
Published: July 2006

Various 7-oxabicyclo[2.2.1]heptanes were synthesized by the photo-induced hypoiodite reaction of 3-cyclohexenols, followed by reduction of 2-iodo-7-oxabicyclo[2.2.1]heptanes.
ASYMMETRIC SYNTHESIS OF 3-ALKYLSUCCINALDEHYDIC ACID METHYL ESTERS
Authors: Asami Masatoshi , Mukaiyama Teruaki
Published: July 2006

The highly stereoselective Michael addition was achieved by treating an aminal, prepared from (S)-2-(anilinomethyl)pyrrolidine and fumaraldehydic acid methyl ester, with the Grignard reagents. 3-Alkylsuccinaldehydic acid methyl esters were obtained with high enantiomeric excesses by the hydrolysis of the resulting aminals.
η-ALLYLIC COORDINATION OF β-DIKETONATE DIANIONS TO PALLADIUM(II)
Authors: Yanase Norio , Nakamura Yukio , Kawaguchi Shinichi
Published: July 2006

The terminal-carbon-bonded monoanions of 2,4-pentanedione and ethyl acetoacetate in the [PdCl(β-dik-C1)(bpy)] complexes were deprotonated and converted into the trihapta dianions in the reactions with thallium(I) 2,4-pentanedionate in benzene and in dichloromethane, respectively.
POTASSIUM FLUORIDE ON INORGANIC SOLID SUPPORTS. A SEARCH FOR FURTHER EFFICIENT REAGENTS PROMOTING HYDROGEN-BOND-ASSISTED ALKYLATIONS
Authors: Yamawaki Junko , Ando Takashi
Published: July 2006

Effectiveness of various inorganic solids as a support of potassium fluoride for promoting “hydrogen-bond-assisted” alkylations was studied. Alumina was found most effective; even O-alkylation of an alcohol can be easily undertaken by use of KF-Al2O3. A variety of molecular sieves showed a selectivity in the case of C-alkylation.
AN ASYMMETRIC TOTAL SYNTHESIS OF A NEW MARINE ANTIBIOTIC-MALYNGOLIDE
Authors: Sakito Yoji , Tanaka Shin , Asami Masatoshi , Mukaiyama Teruaki
Published: July 2006

(−)-Malyngolide was synthesized from (S)-2-hydroxy-2-nonyl-6-heptenal, prepared in high optical yield by an asymmetric synthesis using (S)-2-(anilinomethyl)pyrrolidine as a chiral auxiliary.
CHIRAL PHENYLPHOSPHONIC ESTERS, THEIR PREPARATION VIA ETHYL N-[CHLORO(PHENYL)THIOPHOSPHONYL] l-PROLINATE AND THEIR ABSOLUTE CONFIGURATIONS
Authors: Koizumi Toru , Takagi Hiroyasu , Yoshii Eiichi
Published: July 2006

Diastereomerically pure ethyl N-[chloro(phenyl)thiophosphonyl]-l-prolinate was prepared. From this intermediate various optically active phenylphosphonic acid derivatives have been obtained in high optical yields. Their absolute configurations have been determined by the chemical correlation.
HIGH CATALYTIC ACTIVITY OF IRON OXIDE FOR BENZYLATION, t-BUTYLATION, AND ACETYLATION OF TOLUENE WITH BENZYL, t-BUTYL, AND ACETYL CHLORIDES
Authors: Arata Kazushi , Hino Makoto
Published: July 2006

Iron oxides obtained by calcining at 300–500°C Fe(NO3)3 or iron hydroxides, precipitated by hydrolyzing FeCl3 and Fe(NO3)3 with ammonia, showed exceedingly high catalytic activities for the title reactions at room temperature.
ACYL AZIDES AS ACYLATING AGENTS. A FACILE SYNTHESIS OF SUBSTITUTED TETRALONES
Authors: Sanchez I H , Mendoza M T , Aguilar M A , Martell E A , Gonzalez M E , Lemini C
Published: July 2006

Treatment of 4-aryl butyryl azides or the intermediate mixed carbonic anhydrides with excess polyphosphoric acid or aluminum trichloride, respectively, provide a versatile method of synthesis of substituted tetralones, applicable to those cases where the necessary acid chlorides are unstable or difficult to prepare.
SYNTHESES AND REACTIONS OF DIAMINOOXOSULFONIUM SALTS
Authors: Okuma Kentaro , Higuchi Naotsugu , Ohta Hiroshi , Kobayashi Michio
Published: July 2006

Diaminooxosulfonium salts were prepared by alkylation of aminosulfoximines. Their reactions with dimsyl sodium gave the corresponding ylides and sulfoximines. The intramolecular rearrangement of the ylide led to ortho substitution bia an intermediate cyclohexadienoneimine. Hydrogen transfer, accompanying rearomatization and the subsequent action of a base gave a dihydrobenzoisothiazole derivative.
STRONG METAL-SUPPORT INTERACTION IN ALUMINA SUPPORTED PLATINUM CATALYSTS
Authors: Kunimori Kimio , Okouchi Takahiko , Uchijima Toshio
Published: July 2006

After heat treatments of Pt–Al2O3 catalysts in H2 and O2 at high temperatures, drastic changes both in H2 and O2 chemisorption occurred in spite of no change of Pt particle size. The extent of the changes was found to be quite different among the alumina supports used. The phenomenon relates to a strong metal-support interaction, and some aspects of different behaviors on these alumina supports were discussed.
A NOVEL SYNTHESIS OF TERMINAL OLEFINS BY ANODIC OXIDATION OF CARBOXYLIC ACIDS HAVING A TRIMETHYLSILYL GROUP ON THE β-POSITION
Authors: Shono Tatsuya , Ohmizu Hiroshi , Kise Naoki
Published: July 2006

Anodic oxidation of carboxylic acids having a trimethylsilyl group on the β-position gave exclusively terminal olefins in reasonable yields.
BIVALENT COBALT COMPLEXES WITH 1-(2-PYRIDYLAZO)-2-NAPHTHOL (β-PAN) AND ANALOGOUS LIGANDS
Authors: Mochizuki Katsura , Fujimoto Masatoshi
Published: July 2006

Bivalent cobalt complexes with the title ligands were synthesized and isolated. They were characterized by absorption spectra and magnetic moments. The Co (II) complexes were found to be oxidized to the Co (III) complexes in DMSO in the presence of Cu(II) ions.
THE REACTION OF SMALL RING COMPOUND WITH CARBON MONOXIDE THE CARBONYLATION OF OXIRANE
Authors: Kamiya Yoshio , Kawato Katsuhito , Ohta Hiroyuki
Published: July 2006

The carbonylation of oxiranes catalyzed by rhodium complex afforded β-lactones. Various factors which control the above reaction are presented.
SPLITTING OF WATER INTO HYDROGEN AND HYDROGEN PEROXIDE BY LIGHT IRRADIATION OF ANTHRAQUINONE DERIVATIVES
Authors: Okura Ichiro , Kim-Thuan Nguyen
Published: July 2006

Water splitting into hydrogen and hydrogen peroxide system is developed which contains anthraquinone as a photosensitizer, methyl viologen as an electron transfer agent and colloidal platinum as a catalyst.
SYNTHESIS AND MOLECULAR STRUCTURE OF TPPSn-Mn(CO)4–Hg–Mn(CO)5·1/2CH2C12: A BENT Sn–Mn–Hg–Mn ARRAY EXTENDED OVER A PORPHYRIN RING
Authors: Onaka Satoru , Kondo Yoshinori , Toriumi Koshiro , Ito Tasuku
Published: July 2006

The title compound was synthesized by the reaction of TPPSnCl2 with NaMn(CO)5 which was prepared by Na–Hg reduction of Mn2(CO)10 in THF. The Molecular structure was solved by X-ray diffraction techniques. The molecule possesses a Sn–Mn–Hg–Mn unit and the unit is bound to TPP through the tin atom. The Mn–Hg–Mn unit is almost linear, but the Sn–Mn–Hg unit is bent at a right angle.