bluuebunny/crossref_metadata_2025 huggingface dataset:
THE STRUCTURES OF SEMBURIN AND ISOSEMBURIN, 2,8-DIOXABICYCLO[3.3.1] NONANES ISOLATED FROM THE VOLATILE OIL OF SWEBTIA JAPONICA MAKINO
Authors: Sakai Tsutomu , Naoki Hideo , Takaki Kazutoshi , Kameoka Hiromu
Published: July 2006

The structures of semburin and isosemburin isolated from the volatile oil of Swertia japonica Makino have been determined as 1 and 3, respectively. It is the first time that the 2,8-dioxabicyclo[3.3.1] nonane skeleton has been encountered in natural products.
TETRAKIS-SULFOXIDES AS PHASE TRANSFER CATALYSTS
Authors: Fujihara Hisashi , Imaoka Koji , Furukawa Naomichi , Oae Shigeru
Published: July 2006

Tetrakis(alkyl-sulfinylmethyl)methanes serve as highly efficient phase transfer catalysts in SN2 type displacement reactions of n-octyl bromide with a few nucleophiles.
THE MECHANISM OF THE REACTION OF ARYLOXYTRIMETHYLSTANNANE WITH METHANESULFONYL CHLORIDE
Authors: Kozuka Seizi , Yamaguchi Shigeru , Tagaki Waichiro
Published: July 2006

A kinetic study has been conducted for the reaction of aryloxytrimethylstannane with methanesulfonyl chloride. Substituent effect was found to be dependent on the solvent and obscure solvent effect was observed. A mechanism has been suggested involving nearly concerted four-center transition state.
SYNTHESIS OF Ng-STREPTOLIDYL GULOSAMINIDE — A NEW EVIDENCE FOR THE PROPOSED STRUCTURE OF ANTIBIOTIC STREPTOTHRICIN
Authors: Kusumoto Shoichi , Imaoka Susumu , Kambayashi Yoshikazu , Yoshizawa Kumiko , Shiba Tetsuo
Published: July 2006

The title compound was synthesized and identified with a partial hydrolysis product from natural streptothricin. This work confirmed the presence of the proposed glycosyl guanidine structure in the antibiotic and established a method for its preparation.
THE CRYSTAL STRUCTURE OF GERSTLEYITE Na2(Sb,As)8S13·2H2O: THE FIRST SULFOSALT MINERAL OF SODIUM
Authors: Nakai Izumi , Appleman Daniel E
Published: July 2006

Gerstleyite is monoclinic, a=9.911(8), b=23.05(2), c=7.097(8) Å, β=127.85(7) °, space group Cm, and Z=2. All Sb atoms have essentially 3-fold coordination, forming trigonal SbS3 pyramids. The SbS3 pyramids share corners to form a complex chain parallel to [100]. Na–S bonds cross-link the chains into a slab structure parallel to (010). Water molecules coordinate only to Na atoms.
A FACILE PREPARATION OF THIOL ESTERS FROM CARBOXYLIC ACIDS AND THIOLS
Authors: Kim Sunggak , Yang Sungbong
Published: July 2006

Thiol esters can be conveniently prepared by the reaction of carboxylic acids with thiols and 1-fluoro-2,4,6-trinitrobenzene in the presence of 4-dimethylaminopyridine. The thiol ester formation is found to be very effective for simple carboxylic acids.
REDUCTION OF 1-(3,5-DI-TERT-BUTYL-2-HYDROXYPHENYL)PYRIDINIUM HALIDES WITH RANEY Ni–Al ALLOY IN AN ALKALINE SOLUTION AFFORDING 2,4-DI-TERT-BUTYLBENZOXAZOLO[3,2-a]-5a,6,7,8,9,10-HEXAHYDROPYRIDINES
Authors: Fukata Gouki , Itoh Takashi , Tashiro Masashi
Published: July 2006

Treatment of 1-(3,5-di-tert-butyl-2-hydroxyphenyl)pyridinium halides (1a–1c) with Raney Ni–Al alloy in an alkaline solution afforded the corresponding 2,4-di-tert-butylbenzoxazolo[3,2-a]-5a,6,7,8,9,10-hexahydropyridines (4a–4c). In the case of 1b, 2,4-di-tert-butylbenzoxazolo [3,2-a]-5a,6,7,10-tetrahydro-8-methylpyridine (5) was also obtained as a by-product.
ON THE STRUCTURE OF 2-CARBOXYPHENYL METHYL SELENOXIDE AND ITS SODIUM SALT IN SOLUTION STUDIED BY 1H, 13C, AND 77Se NMR SPECTROSCOPY
Authors: Nakanishi Waro , Matsumoto Sigekazu , Ikeda Yoshitsugu , Sugawara Tadashi , Kawada Yuzo , Iwamura Hiizu
Published: July 2006

1H, 13C, and 77Se NMR spectra of 2-carboxyphenyl methyl selenoxide, its sodium salt, and the related compounds have been measured to disclose their structures in solution. The results show that the carboxylic acid has the cyclic selenurane structure, while the salt is an acyclic selenoxide. The 77Se chemical shifts and 1J(77Se–13C) values are proposed to be particularly useful in distinguishing the two structures.
EFFICIENT TRANSFORMATION OF (Z)-2-BUTENE-l,4-DIOLS TO SUBSTITUTED FURANS WITH PYRIDINIUM CHLOROCHROMATE (PCC)
Authors: Nishiyama Hisao , Sasaki Masaharu , Itoh Kenji
Published: July 2006

(Z)-2-Butene-1,4-diols was were efficiently converted to the corresponding substituted furans by one step oxidation–dehydration process with pyridinium chlorochromate (PCC).
PREPARATION AND PROPERTIES OF A NOVEL COMPLEX OF THE [CoIIIP6]3+-TYPE, TRIS{1,2-BIS(DIMETHYLPHOSPHINO)ETHANE}COBALT(III) PERCHLORATE
Authors: Ohishi Tomoji , Kashiwabara Kazuo , Fujita Junnosuke
Published: July 2006

The [Co{(CH3)2PCH2CH2P(CH3)2}3](ClO4)3 complex was prepared from trans-[CoCl2{(CH3)2PCH2CH2P(CH3)2}2]ClO4 and the diphosphine ligand. The lemon yellow trisdiphosphine complex is rather unstable to air even in the solid state to turn gradually orange yellow.
EFFECT OF OXYGEN ON THE PHOTOSTATIONARY STATE COMPOSITION IN TRIPLET SENSITIZED CIS–TRANS ISOMERIZATION OF 1-ARYL-3,3-DIMETHYL-1-BUTENES. A CLASSIFICATION OF TRIPLET ENERGY SURFACES OF AROMATIC OLEFINS
Authors: Arai Tatsuo , Karatsu Takashi , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

The trans-isomer ratio of 1-p-biphenylyl-3,3-dimethyl-1-butene (BDMB) at the photostationary state in triplet sensitized isomerization increases with increasing concentration of oxygen and azulene. It is proposed to classify triplet energy surfaces of some aromatic olefins containing BDMB based on the variation of their photostationary isomer ratios with oxygen and/or azulene as triplet quenchers in their photoisomerization.
BIOMIMETIC REDUCTION OF SULFURIC ACID
Authors: Oae Shigeru , Togo Hideo
Published: July 2006

Inorganic sulfate was reduced by treatment with either arenesulfenyltriphenylphosphonium arenethiolate or iodotriphenylphosphonium iodide to triphenylphosphine sulfide via formation of hydrogen sulfide. The reaction of sulfate to sulfide is considered to proceed via the course which resembles the biological reaction path involved in the assimilatory metabolism of inorganic sulfate in microorganisms.
A NOVEL TYPE OF GLYCERIDES BEARING A METHACRYLIC ACID MOIETY FROM THE BROWN ALGA, SARGASSUM FULVELLUM
Authors: Kusumi Takenori , Ishitsuka Midori , Iwashita Takashi , Naoki Hideo , Konno Toshinori , Kakisawa Hiroshi
Published: July 2006

From S. fulvellum, a new type of glycerides bearing a methacrylic acid moiety were isolated, and the structures were determined to be 2-[3-eicosadi(and tetra)enoyloxy-2-hydroxypropanoxy)methylpropenoic acids.
1,3-O- TO C-ALKYL MIGRATION OF 1-ALKENYL ALKYL ACETALS CATALYZED BY BORON TRIFLUORIDE. A NOVEL CROSS ALDOL TYPE REACTION
Authors: Takahashi Mitsuru , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

1,3-O- to C-alkyl migration of acyclic 1-alkenyl alkyl acetals catalyzed by BF3·Et2O gives selectively α-alkyl-β-alkoxyaldehydes.
NOVEL REACTIONS OF 1-(1-PYRROLIDINYL)ACENAPHTHYLENE WITH DIPHENYLCYCLOPROPENONE AND DIPHENYLCYCLOPROPENETHIONE
Authors: Tsuge Otohiko , Okita Shigeru , Noguchi Michihiko , Watanabe Haruyuki
Published: July 2006

An enamine, 1-(1-pyrrolidinyl)acenaphthylene, reacts with diphenylcyclopropenone to give δ-aminocyclopentenone derivative together with a trace amount of acecyclone. In the reaction of the enamine with diphenylcyclopropenethione, however, γ-aminocyclopentenethione derivative is formed as the major product accompanied by another 1:1 adduct which was tentatively assumed to be a benzothiophene derivative.
ADJUSTING THE HYDROGEN–CARBON MONOXIDE RATIO IN SYNTHESIS GAS BY POLYSTYRENE-COPPER ALUMINATE COMPLEX
Authors: Hirai Hidefumi , Komiyama Makoto , Hara Susumu
Published: July 2006

The molar ratio of hydrogen to carbon monoxide in synthesis gas, which has the initial molar ratio of 1.25 and is saturated with water, is adjusted to a desired value by the selective separation of carbon monoxide by the absorbent composed of polystyrene, cuprous chloride, aluminum chloride, and toluene.
OLIGOMERIZATION OF CIS-2-BUTENE WITHOUT ITS DOUBLE BOND MIGRATION OVER BORON PHOSPHATE EVACUATED AT A HIGH TEMPERATURE
Authors: Imizu Yuzo , Aoyama Shigeo , Itoh Hidenobu , Tada Akio
Published: July 2006

Although boron phosphate calcined in air at 1173 K did not show any catalytic activity for the isomerization and oligomerization of cis-2-butene at 298 K, boron phosphate evacuated at 1173 K catalyzed the oligomerization without any detectable formation of 1-butene at 273 K.
SYNTHESIS AND REACTION OF 3-(ALKYLTHIO)- 1,2-BENZISOTHIAZOLE 1,1-DIOXIDES AS AN ODORLESS CRYSTALLINE EQUIVALENT OF THIOLS
Authors: Inomata Katsuhiko , Yamada Hiroyuki , Kotake Hiroshi
Published: July 2006

It was found that sodium salt of 1,2-benzisothiazol-3(2H)-thione 1,1-dioxide (thiosaccharin) readily reacted with alkyl halide affording 3-(alkylthio)-1,2-benzisothiazole 1,1-dioxide, which very smoothly produced the corresponding alkanethiol by the reaction with piperidine in almost quantitative yield.
CHLORINATION OF ACYCLIC β-DIKETONES. FORMATION OF β-CHLORO-β,γ-UNSATURATED KETONES
Authors: Suama Masakazu , Nakajima Akihiko , Sugita Toshio , Ichikawa Katsuhiko
Published: July 2006

Chlorination of acyclic β-diketones with triphenylphosphine-carbon tetrachloride and the other chlorinating reagents afforded β-chloro-β,γ-unsaturated ketones except when the terminal alkyl group was methyl or t-butyl. Unsymmetrical acyclic β-diketones yielded a mixture of the products chlorinated on each carbonyl carbon.
MOTION OF C5H5 RINGS IN THREE CRYSTALLINE MODIFICATIONS OF FERROCENE AS STUDIED BY 1H NMR
Authors: Kubo Atsushi , Ikeda Ryuichi , Nakamura Daiyu
Published: July 2006

The 1H spin-lattice relaxation time T1 at 20 MHz and the second moment of 1H NMR absorptions were observed at various temperatures for ferrocene in its monoclinic, triclinic, and orthorhombic phases. The barrier to the rotational reorientation of C5H5 rings was found to be largest in the orthorhombic phase.
DISCRETE RADICAL SPECIES DEPENDENT UPON SOLVENT AS DETECTED BY CIDNP IN THE LIGHT-INDUCED ELECTRON TRANSFER FROM HYDROQUINONES TO PHEOPHYTIN a
Authors: Maruyama Kazuhiro , Furuta Hiroyuki , Otsuki Tetsuo
Published: July 2006

Light-induced electron transfer from hydroquinones to Phe a was studied by means of CIDNP technique. Depending upon the solvent, electron transfer proceeds in different manners. In benzene, ion radical pair; hydroquinone cation radical and Phe a\ewdot, of the triplet spin multiplicity was formed, whereas neutral radical pair;phenoxyl radical and Phe a-H·, of the singlet spin multiplicity in methanol.
A NEW CONVERSION OF SILYL ENOL ETHERS INTO THE CORRESPONDING BORON ENOLATES WITH DIALKYLBORON HALIDES OR DIALKYLBORON TRIFLATES, AND CROSS ALDOL REACTIONS VIA THE BORON ENOLATES
Authors: Wada Makoto
Published: July 2006

Silyl enol ethers react with dialkylboron halides or dialkylboron triflates to give the corresponding boron enolates quantitatively under mild conditions. Boron enolates thus generated are effectively used to afford cross aldol products with benzaldehyde.
THE NOVEL TYPE STRUCTURE OF Δ-CIS-α-[(1R,2R) -N,N′-BIS(2-PYRIDYLMETHYL)-1,2-CYCLOHEXANEDIAMINE]DICHLOROCHROMIUM(III) CATION
Authors: Yamamoto Yukihiro , Hata Yasuo , Shimura Yoichi
Published: July 2006

The molecular structure of Δ-CIS-α-[CrCl2(RR-picchxn)]+ was determined by the X-ray structure analysis (RR-picchxn = (1R,2R)-N,N′-bis(2-pyridylmethyl)-1,2-cyclohexanediamine). The terminal chelate ring formed by the coordination of equatorially-oriented substituent on the secondary nitrogen atom is of novel type.
THE PHOTOCHEMICAL BEHAVIOR OF CYCLIC IMINO ETHERS. THE N–O BOND FISSION AND SYN-ANTI ISOMERIZATION IN THE C=N–O CHROMOPHORE
Authors: Saiki Hiroshi , Mukai Toshio
Published: July 2006

Six-, seven-, and eight-membered cyclic imino ethers (3, 4, and 5) were synthesized and their photoreactions were investigated to compare with those of isoxazoline derivatives. The derivatives of 3 upon irradiation afforded ring-cleaved products, whereas 4 and 5 were found to be inert to irradiation.
CRYSTAL STRUCTURE OF (−)4 7 4-mer-{N-2-AMIN0ETHYL-(1,3-PROPANEDIAMINE)}(DIETHYLENETRIAMINE) COBALT(III) IODIDE MONOHYDRATE
Authors: Ishii Minoru , Sato Shoichi , Saito Yoshihiko , Nakahara Masayoshi
Published: July 2006

The molecular structure of the title compound was determined to be (S)-mer-I type by X-ray diffraction. The N(secondary)–H bond in the diethylenetriamine (dien) is directed toward the six-membered chelate ring formed by the N-2-aminoethyl-(1,3-propanediamine) (aepn). The six-membered ring formed by the aepn takes a chair-form and its five-membered-ring is δ, while those of the two five-membered rings of the duen are λ and δ, respectively.
UNCOUPLER HAS A WEAK IONOPHORIC ACTIVITY
Authors: Ueno Masaharu , Yasui Tomomi , Horikoshi Isamu
Published: July 2006

The potassium ion transport across liposomal membranes induced by uncoupler was studied. Both SF6847 and DNP induced K+ leak from liposomes containing KSCN, but did not induce the leak from liposomes containing KC1. A powerful uncoupler, SF6847, was also a stronger K+ ionophore than a weak uncoupler, DNP.
A NEW METHOD FOR THE PREPARATION OF ZEOLITE ZSM-5 BY USING SODIUM n-DODECYLBENZENE SULFONATE
Authors: Hagiwara Hiroyuki , Kiyozumi Yoshimichi , Kurita Minoru , Sato Toshio , Shimada Hiromichi , Suzuki Kunio , Shin Shigemistu , Nishijima Akio , Todo Naoyuki
Published: July 2006

Zeolite ZSM-5 was easily synthesized by using sodium n-dodecylbenzene sulfonate (SDBS) in place of organic ammonium and/or phosphonium ions. A well-crystallized ZSM-5 was obtained by the mild hydrothermal treatment of a reaction mixture composed of SDBS and alumina-silica gel at about 180 °C and PH2O ≈10 kg/cm2 for 4 h.
SYNTHESIS OF 1-(DIMETHYLAMINOMETHYLENE)-6(1H)-AZULENONE, A 1,6-AZULENEQUINONE 1-METHIDE DERIVATIVE
Authors: Morita Tadayoshi , Ise Fumiaki , Takase Kahei
Published: July 2006

Reaction of 6-hydroxyazulene with DMF-POCl3 followed by treatment with aq HN(CH3)2 gave 1-(dimethylaminomethylene)-6(1H)-azulenone (2) in 100% yield. Treatment of 2 with Ac2O generated 6-acetoxy-1-formylazulene (3) which was hydrolyzed with aq HN(CH3)2 at room temp to give 1-formyl-6-hydroxyazulene (4). Upon heating of 3 with aq HN(CH3)2, 2 was obtained. Alkaline hydrolysis of 2 afforded 4.
A NEW SYNTHESIS OF β NITRO CARBONYL COMPOUNDS FROM ALKYL VINYL KETONES WITH SODIUM NITRITE-ACETIC ACID IN TETRAHYDROFURAN
Authors: Miyakoshi Tetuo , Saito Shojiro , Kumanotani Ju
Published: July 2006

The reaction of alkyl vinyl ketones with sodium nitrite-acetic acid in THF gave the corresponding β-nitro carbonyl compounds in 42–82% yield.
REACT0ION OF (1-3-η-VINYLCARBENE)IRON COMPLEXES WITH ENNEACARBONYLDIIRON; FORMATION OF A FERRACYCLOPENTADIENEIRON(Fe–Fe) COMPLEX AND A VINYLCARBENEDIIRON(Fe–Fe) COMPLEX
Authors: Mitsudo Take-aki , Watanabe Hiroyoshi , Watanabe Katsuya , Watanabe Yoshihisa , Kafuku Komei , Nakatsu Kazumi
Published: July 2006

The (η3-vinylcarbene)iron complex 1 reacts with Fe2(CO)9 to give a ‘ferrole’ derivative 3. Methylation of 3 with diazomethane gives a methoxy derivative 4. On the other hand, the 2-methoxycarbonylvinylcarbene complex 2 reacts with Fe2(CO)9 to give a vinylcarbene binuclear complex 5 containing the vinylcarbene moiety co-ordinated to two iron atoms. The structure of 5 has been determined by single-crystal X-ray diffraction study.
HYDROXIDE ADDITION TO THE COBALT(III) MIXED LIGAND COMPLEX, (1,1,1,5,5,5-HEXAFLUOROACETYLACETONATO)BIS(ETHYLENEDIAMINE)COBALT(III) PERCHLORATE
Authors: Fukuda Yutaka , Ishige Masayoshi , Ito Tasuku , Kuroda Kashiro , Sone Kozo , Suzuki Yoshie , Yano Shigenobu , Yoshikawa Sadao
Published: July 2006

NMR studies revealed that the reaction of the title complex, [Co(hfac)(en)2] (ClO4)2 with OH− in an aqeous solution is the addition of OH− to the carbonyl carbon of coordinated hfac.
A STEREOSELECTIVE FORMATION OF (Z)-2-METHYL-2-ALKENOL BY THE WITTIG REACTION: ITS APPLICATION TO A SYNTHESIS OF NERYLACETONE AND (Z,Z)-FARNESYLACETONE
Authors: Sato Kikumasa , Miyamoto Osamu , Inoue Seiichi , Kobayashi Toru , Furusawa Fumio
Published: July 2006

The Wittig reaction of benzyloxyacetone or tetrahydropyranyloxyacetone with 4-pentynylidenetriphenylphosphorane in salt-free conditions followed by removal of the protecting group afforded (Z)-2-methylhept-2-en-6-yn-1-ol in 95–96 % stereoselectivity. After conversion of the allylic alcohol to the corresponding bromide, the latter was coupled with prenyl or neryl p-tolyl sulfone, followed by reductive desulfonation and hydration of the acetylenic bond, to give nerylacetone and (Z,Z) -farnesylacetone, respectively.
FLASH VACUUM PYROLYSIS OF 2-BENZYLPYRIDINE N-OXIDES. SYNTHESIS OF METHYLPYRIDO[1,2-a]INDOLES
Authors: Ohsawa Akio , Kawaguchi Takayuki , Igeta Hiroshi
Published: July 2006

Flash vacuum pyrolysis of 2-benzylpyridine N-oxides afforded pyrido[1,2-a]-indole and its various methyl-substituted derivatives in moderate yields. Benzo[g]quinoline in the pyrolyses of 2-(o-methylbenzyl)pyridine N-oxide and 2-benzyl-3-methylpyridine Noxide, and 2-(β-styryl)pyridine in the reaction of 2-(β-phenethyl)pyridine N-oxide were major products as exceptional cases.
ACTIVATION ENERGIES FOR HYDROGEN EVOLUTION REACTION AT LaM5-TYPE ALLOY ELECTRODES
Authors: Kitamura Tohru , Iwakura Chiaki , Tamura Hideo
Published: July 2006

The apparent activation energy for the cathodic evolution of hydrogen on LaM5-type alloys (M: Cr, Fe, Co, Ni) was found to be closely related to the heat of formation of their ternary hydrides. The large heats of formation of LaNi5 and LaCo5 were presumed to be the chief cause of the synergistic effect in hydrogen evolution reaction at the alloy electrodes.
4-CHLOROPHENYL 5-CHLORO-8-QUINOLYL PHOSPHOROCHLORIDATE: A PRACTICALLY USEFUL PHOSPHORYLATING AGENT FOR OLIGORIBONUCLEOTIDE SYNTHESIS VIA PHOSPHOTRIESTER APPROACH
Authors: Takaku Hiroshi , Yoshida Masatoshi , Kamaike Kazuo , Hata Tsuiiaki
Published: July 2006

5′-O-Dimethoxytrityl-2′-O-tetrahydropyranylnucleosides (2) smoothly reacts with 4-chlorophenyl 5-chloro-8-quinolyl phosphorochloridate (1) prepared from 4-chlorophenyl phosphodichloridate and 5-chloro-8-hydroxyquinoline to give 5′-O-dimethoxytrityl-2′-O-tetrahydropyranylnucleoside 3′-(4-chlorophenyl, 5-chloro-8–quinolyl) phosphates (3) in high yields. They are key intermediates for the synthesis of oligoribonucleotides via phosphotriester approach.
PHOTOCHEMICAL REACTION OF EPOXYNAPHTHOQUINONES WITH ALCOHOLS. AN IONIC TRAPPING OF CARBONYL YLIDES
Authors: Osuka Atsuhiro , Suzuki Hitomi , Maruyam Kazuhiro
Published: July 2006

Irradiation of several 2,3-dialkyl-2,3-epoxy-2,3-dihydro-1,4-naphthoquinones in the presence of alcohol gave ring-contracted alcohol-adducts via nucleophilic addition of alcohol to carbonyl ylides.
METHANE FORMATION FROM SOLID CARBON AND HYDROGEN BY THE USE OF PHYSICALLY MIXED CATALYSTS
Authors: Niiyama Hiroo , Sato Hiromi , Nakamura Ryuichi , Echigoya Etsuro
Published: July 2006

Methane formation from active carbon and H2 by the use of physically mixed metal on silica catalysts was investigated. Methane formation was found only in the initial several ten minutes, by the end of which oxygen-containing functional groups on the surface of active carbon had been depleted. The reactivity of carbon was regenerated by the contact with gaseous oxygen. It is concluded that hydrogen atoms, dissociated on metal surface and transferred to the carbon surface by interparticle spillover, react with surface functional groups to yield methane.
NEW, NONCYCLIC IONOPHORES EXHIBITING SELECTIVE CATION TRANSPORT AGAINST THE CONCENTRATION GRADIENT
Authors: Hiratani Kazuhisa
Published: July 2006

Some oligoethylene glycol derivatives containing both quinolyl and carboxyl terminal groups were prepared as synthetic ionophores. These polyethers can transport alkali ions selectively through liquid membrane against the concentration gradient. The rate of the active transport and the ion-selectivity with them change with changing the length of oxyethylene chain.
CYCLOADDITION REACTIONS OF 1,3-DIPHENYLTHIAZOLO[3,4-a]BENZIMIDAZOLE WITH FULVENE AND TROPONE SYSTEMS
Authors: Tsuge Otohiko , Shiraishi Hidehiko , Noguchi Michihiko
Published: July 2006

1,3-Diphenylthiazolo[3,4-a]benzimidazole (1) containing tetravalent sulfur reacts as a thiocarbonyl ylide dipole with 6,6-diphenylfulvene to give a mixture of two regioisomeric exo-[4 + 2] adducts and endo-[4 + 2] adduct. The reaction of 1 with tropone and 8,8-dicyanoheptafulvene proceeds via a [4 + 2] cycloaddition to the C4–C5and C1–C2 bond of the addend to afford the exo-adduct and desulfurized compound respectively.
β-LACTAM AS SYNTHETIC INTERMEDIATE. A NEW SYNTHETIC APPROACH TO OLIGOPEPTIDES THROUGH NOVEL β-LACTAMS
Authors: Hatanaka Naoto , Ojima Iwao
Published: July 2006

Synthetic method of a new class of β-lactams, which have two β-lactams in a single molecule, was established and subsequent cleavage upon hydrogenolysis by the use of palladium catalyst gave tri- or tetrapeptides, thus providing a new approach to oligopeptides.
CYCLOADDITION REACTIONS OF ARYL 2-FURYL THIONES AND ARYL 2-THIENYL THIONES WITH MALEIC ANHYDRIDE AND 2-NORBORNENE
Authors: Ohmura Haruo , Motoki Shinichi
Published: July 2006

The reactions of aryl 2-furyl thiones with maleic anhydride and 2-norbornene gave 1,4-cycloadducts. The reactions of aryl 2-thienyl thiones with maleic anhydride gave aromatized and oxidized 1,4-cycloadducts, while the reaction with 2-norbornene gave only normal 1,4-cycloadducts. In these reactions, one of the double bond in the furan or thiophene ring and the thiocarbonyl group reacted as a hetero diene system.
CARBON–SILICON BOND CLEAVAGE OF ORGANOTRIALKOXYSILANES AND ORGANOSILATRANES WITH m-CHLOROPERBENZOIC ACID AND N-BROMOSUCCINIMIDE. NEW ROUTE TO PHENOLS, PRIMARY ALCOHOLS AND BROMIDES
Authors: Hosomi Akira , Iijima Susumu , Sakurai Hideki
Published: July 2006

Alkyl- and aryltriethoxysilanes undergo oxidative carbon–silicon bond cleavage smoothly with m-chloroperbenzoic acid (MCPBA) to afford the corresponding alcohols. Silatranes similarly gave alcohols and bromides with MCPBA and N-bromosuccinimide, respectively.
SYNTHESIS OF TRANS-4,8,12,15,15-PENTAMETHYLBICYCLO[9,3,1]PENTADECA-3E,7Z,12Z-TRIENE, A GEOMETRICAL ISOMER OF ANHYDROVERTICILLOL
Authors: Kumagai Takashi , Ise Fumiaki , Uyehara Tadao , Kato Tadahiro
Published: July 2006

A 7Z-isomer of anhydroverticillol skeleton was constructed in 15% yield when the 7E allyl bromide having secoverticillol framework was treated with LiN(TMS)2. Reductive removal of the SO2Ph group furnished a geometrical isomer of anhydroverticillol.
UNUSUAL CYCLOADDITIONS OF 4-PHENYL-1,2,4-TRIAZOLIN-3,5-DIONE TO ENDO- AND EXO-TRICYCLO[3.2.1.02,4]OCT-6-ENES
Authors: Erden Ihsan
Published: July 2006

4-Phenyl-1,2,4-triazolin-3,5-dione readily cycloadds to endo- and exo-tricyclo[3.2.1.02,4]oct-6-enes to give Δ1-1,2-diazetines besides skeletally rearranged products. All adducts can be converted to the respective azo compounds which exhibit some unusual thermal and photochemical behavior.
A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXAMIDES AND PEPTIDES BY THE USE OF TETRABUTYLAMMONIUM SALTS
Authors: Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

Various carboxamides and peptides are prepared in good yields by treatment of free acids and amines in H2O-dichloromethane or aqueous THF with bis(o-nitrophenyl) phenylphosphonate in the presence of tetrabutylammonium hydrogen sulfate or bromide. Carboxylic esters are also successfully converted to amides via carboxylate salts in one-pot.
SYNTHESIS OF 9-AZAAZULENO[2,1-b]THIOPHENES
Authors: Yamane Kameji , Fujimori Kunihide , Takeuchi Toru
Published: July 2006

9-Azaazuleno[2,1-b]thiophene and its derivatives were synthesized from 2-chloro-3-ethoxycarbonyl- or 2-chloro-3-formyl-1-azaazulene in a few steps.
PHOTO- AND RADIATION-INDUCED ALCOHOLYSIS AND SUBSTITUTION OF p-DICYANOBENZENE IN 2-PROPANOL
Authors: Sugimori Akira , Nishijima Masayuki , Yashima Toshihiro
Published: July 2006

The irradiation of p-dicyanobenzene with 254 nm light in 2-propanol causes the alcoholysis of CN group to give isopropyl p-cyanobenzimidate. The UV-irradiation in the presence of acetone or γ-irradiation brings about the substitution of a cyano group by the hydroxyalkyl group derived from the alcohol. The substitution occurs via the electron transfer from hydroxyalkyl radicals or electrons followed, by the attack of hydroxyalkyl radicals.
EXCEPTIONAL HINDRANCE OF INTERNAL ROTATION OF HYDROXYL GROUP IN THE 2,6-Di-t-BUTYL-4-METHYLPHENOL CATION RADICAL STUDIED BY ESR TECHNIQUE
Authors: Nemoto Fujito , Mukai Kazuo , Tsuzuki Noriko , Ishizu Kazuhiko
Published: July 2006

ESR spectrum of 2,6-di-t-butyl-4-methylphenol cation radical was measured. In this radical, it can be expected that the strong steric repulsion between hydroxyl group and the neighboring t-butyl groups prevents hydroxyl group being coplanar with the aromatic plane. Nevertheless, the experimental results exhibit that the hydroxylic hydrogen is close to the plane of aromatic ring.
SYNTHESIS OF (−)-DIHYDROMAHUBANOLIDE B AND (−)-ISODIHYDROMAHUBANOLIDE B
Authors: Tanaka Akira , Yamashita Kyohei
Published: July 2006

The total synthesis of (−)-dihydromahubanolide B and (−)-isodihydromahubanolide B isolated from the Amazonian Lauraceae Licariamahuba (Samp.) Kosterm was achieved starting from (−)-methyl 5-hydroxy methyl -2,2-dimethyl-1,3-dioxolane-4-carboxylate which was readily available from L-(+)-tartaric acid.
PREPARATION AND REACTION OF THE UNSYMMETRICAL-FACIAL ISOMERS OF THE BIS(N-ALKYLIMINODIACETATO)COBALTATE(III) IONS
Authors: Ama Tomoharu , Kawaguchi Hiroshi , Yasui Takaji
Published: July 2006

The u-fac isomers of the bis(N-methyliminodiacetato)cobaltate(III) ([Co(mida)2]−), and bis(N-ethyliminodiacetato)cobaltate(III) ([Co(eida)2]−), which have large steric compression, were newly prepared and characterized on the basis of the electronic absorption and circular dichroism spectral data. The first absorption maxima of these complexes are shifted to the lower energy side than that of the u-fac-[Co(ida)2]−. In basic aqueous solution, the u-fac-[Co(mida)2]− and -[Co(eida)2]− were reduced to Co(II) complexes.
X-RAY DIFFRACTION STUDY OF LIQUID METHANOL
Authors: Tanaka Masami , Nishikawa Keiko , Fujiyama Tsunetake
Published: July 2006

X-ray diffraction intensity measurements of liquid methanol were carried out by use of an energy-dispersive X-ray diffractometer. No apparent maximum due to hydrogen bonded oxygen–oxygen interference was detected in the electronic distribution function. Our diffraction intensity curve and distribution function are consistent with Harvey’s results, but in contradiction to those of Wertz and Kruh.
DIMETHYLBENZOPYRAZOLOTRIAZOLE vs METHYLPYRAZOLOQUINOXALINE FROM 3,5-DIMETHYL-1-(2-NITRENOPHENYL)PYRAZOLE
Authors: Albini Angelo , Bettinetti Gian Franco , Minoli Giovanna
Published: July 2006

The chemistry of singlet and triplet 3,5-dimethyl-1-(2-nitrenophenyl)pyrazole is examined. Intramolecular electron transfer is found to play a key role in determining the easy reaction to the ylide (VII) from the singlet state and the “lazyness” of the triplet state.
PHOTOCHEMICAL DIRECT ALKYLAMINATION OF 1-BENZAMIDOANTHRAQUINONE
Authors: Yoshida Katsuhira , Okugawa Tetsuo , Yamashita Yoshio
Published: July 2006

The photochemical reaction of 1-benzamidoanthraquinone with primary aliphatic amines in aerated benzene leads to the formation of 1-benzamido-4-(alkylamino)anthraquinones in 58–64% yields.
DOUBLE BOND MIGRATION OF ALLYL ETHERS OVER SOLID BASE CATALYSTS
Authors: Matsuhashi Hiromi , Hattori Hideshi , Tanabe Kozo
Published: July 2006

Double bond migrations of allyl ethers were carried out over various solid base catalysts. Magnesium oxide, CaO, SrO, and La2O3 exhibited high activities. High cis/trans ratios in the products suggest that the reaction proceed via cis-π-allylic anions as intermediates.
SYNTHESIS OF PENTALENIC ACID THROUGH BIOGENETIC LIKE CYCLIZATION OF HUMULENE
Authors: Sakai Kazuya , Ohtsuka Toshikazu , Misumi Shunjiro , Shirahama Haruhisa , Matsumoto Takeshi
Published: July 2006

Humulene furnished 4,7-epoxy-3-methylene-7,10,10-trimethyl-11-bicyclo[6,3,0]undecanol 9 in 34% yield employing oxymercuration as a key step. On treatment with BF3·OEt2,7,11-dihydroxy-3,7,10,10-tetramethyl-3-bicyclo[6.3.0]undecene, which was derived from 9 by ether cleavage, afforded 10α-hydroxypentalenene 13 (20%) along with four byproducts. Oxidation of allylic methyl group of 13 gave methyl pentalenate in 13% yield from 9.
ISOLATION OF ALL THE FIVE GEOMETRICAL AND CONFORMATIONAL ISOMERS OF BIS(ISOTHIOCYANATO)(TRIETHYLENETETRAMINE)COBALT(III) COMPLEX
Authors: Sakai Yukio , Nokami Yusei , Kanno Hideaki , Utsuno Shunji
Published: July 2006

All the five geometrical and conformational isomers of bis(isothiocyanato)(triethylenetetramine)cobalt(III) ion were isolated. Each isomer was identified on the basis of its chemical properties, 13C NMR spectrum and absorption spectrum.
UNUSUAL FRIEDEL-CRAFTS REACTION OF 2,5-DICHLORO-3-CHLOROMETHYLTHIOPHENE WITH BENZENE AND SOME ALKYLBENZENES
Authors: Sone Tyo , Kawasaki Hidenori , Nagasawa Shoji , Takahashi Norio , Tate Kiyoshi , Sato Kazuaki
Published: July 2006

The reaction of 2,5-dichloro-3-chloromethylthiophene with benzene and some alkylbenzenes in the presence of aluminum chloride yielded the unusual 4-aryl-3-arylmethyl-2-chlorothiophenes as the major products.
CYCLODIMERIZATION OF 3-METHYL-3-BUTEN-2-ONE OXIME
Authors: Ota Tadatoshi , Masuda Seizo , Tanaka Hitoshi
Published: July 2006

Nitron derivative, 8-hydroxy-1,4,5,7-tetramethyl-6,8-diazabicyclo [3.2.1]oct-6-ene 6-oxide, was obtained by the cyclodimerization of 3-methyl-3-buten-2-one oxime at 80 °C. This nitron was easily converted into the stable nitroxy radical by the attack of poly(N-methylacrylamide) radical.
FREE RADICAL ADDITION OF α-BROMOCARBOXYLIC ACIDS TO OLEFINS LEADING TO γ-BUTYROLACTONES
Authors: Nakano Taichi , Kayama Mikio , Matsumoto Hideyuki , Nagai Yoichiro
Published: July 2006

Benzoyl peroxide-catalyzed free radical addition of bromoacetic, α-bromopropionic, and α-bromobutyric acids to olefins took place under mild conditions to afford γ-alkyl-, γ-alkyl-α-methyl-, and γ-alkyl-α-ethyl-γ-butyrolactones in good yields.
A GENERAL SYNTHETIC METHOD OF 1,2-DIHYDROCYCLOBUTA[c]COUMARIN AND ITS 1-SUBSTITUTED DERIVATIVES
Authors: Naito Toshihiko , Nakayama Nayomi , Kaneko Chikara
Published: July 2006

4-Methoxycoumarin reacts photochemically with ethylene and its substituted derivatives to form 8b-methoxy-1,2,2a,8b-tetrahydrocyclobuta [c]coumarin and its 1-substituted derivatives, which in turn eliminate methanol by boron trifluoride etherate in benzene to give the corresponding 1,2-dihydrocyclobuta[c] coumarins in high overall yields.
ONE-STAGE α-GLUCOSYLATION USING TETRA-O-BENZYL-α-d-GLUCOSE AND MIXTURE OF TRIMETHYLSILYL BROMIDE, COBALT(II) BROMIDE, TETRABUTYLAMMONIUM BROMIDE, AND MOLECULAR SIEVE
Authors: Morishima Naohiko , Koto Shinkiti , Kusuhara Chiharu , Zen Shonosuke
Published: July 2006

The one-stage α-glucosylation using 2,3,4,6-tetra-O-benzyl-α-d-glucopyranose and a mixture of trimethylsilyl bromide, cobalt(II) bromide, and tetrabutylammonium bromide in the presence of molecular sieve is presented.
AN EFFICIENT METHOD FOR GLUCOSYLATION OF HYDROXY COMPOUNDS USING GLUCOPYRANOSYL FLUORIDE
Authors: Mukaiyama Teruaki , Murai Yoshiyuki , Shoda Shin-ichiro
Published: July 2006

Glucosides and disaccharides are prepared in good yields from 2,3,4,6-tetra-O-benzyl-β-d-glucopyranosyl fluoride and hydroxy compounds in the presence of stannous chloride and silver perchlorate. In most cases, α-glucosides are predominantly (α⁄β=80⁄20∼92⁄8) obtained.
CLEAVAGE OF CYCLOPROPANE RING VIA PHOTOINDUCED ELECTRON-TRANSFER BY THE USE OF COPPER(II) IONS
Authors: Mizuno Kazuhiko , Ogawa Jun , Kagano Hirokazu , Otsuji Yoshio
Published: July 2006

Irradiation of a methanolic solution of phenylcyclopropane in the presence of copper(II) ions affords 1,3-dimethoxy-1-phenylpropane and meso- and dl-1,6-dimethoxy-3,4-diphenylhexanes in good yields through the electron-transfer from the excited cyclopropane to Cu(II) ions.
SYNTHESIS OF TUNGSTEN ALKOXY-HYDRAZIDO(2−) COMPLEXES WITH TRANSITION METAL CARBONYL COMPLEX ANION
Authors: Nishihara Hiroshi , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

The dinitrogen complex trans-[W(N2)2(dpe)2] (dpe = 1,2-bis(diphenylphosphino)ethane) reacted with HCo(CO)4 or HFeCo3(CO)12 in the presence of alcohols to give alkoxy-hydrazido(2−) complexes, [W(OR)(NNH2)(dpe)2]+[A]− (A = Co(CO)4, R = CH3, C2H5; A = Co3(CO)10, R = CH3; A = FeCo3(CO)12, R = CH3, C2H5, n-C3H7).
CRYSTAL STRUCTURE OF (DIETHYLENETRIAMINE) (l-PENICILLAMINATO)COBALT(III) CHLORIDE
Authors: Okamoto Ken-ichi , Wakayama Katsuhiko , Ohmasa Masaaki , Hidaka Jinsai
Published: July 2006

Three isomers of (diethylenetriamine)(l-penicillaminato)cobalt(III) complex were chromatographically isolated. The crystal structure of the first eluted isomer, trans(NiN)-[Co(l-pen) (dien)]Cl·H2O, was determined by X-ray diffraction study. Electronic absorption and circular dichroism spectra of the isomer are also reported.
MIS SCHOTTKY BARRIER PARAMETERS OF AL/MESO-TBTRAPHENYLPORPHINATOMAGNESIUM(II)/Ag CELL
Authors: Yamashita Kazuo , Kihara Nobuo
Published: July 2006

Integral capacitance measurements of Al/meso-tetraphenylporphinatomagnesium(II)/Ag cells, where the Al and porphyrin are separated by a thin A12O3 film, have been made by thecapacitor discharge method. The 1/Ci vs. Q plots yield a good straight line. The apparent diffusion potential Vo estimated from the slope and the 1/Ci. axis intercept is in the range 0.8–1.3 volts. The derived values for the barrier width Wo and the density ofionized impurity N are 11–17 nm and 1.2–1.6×1018 cm−3.
MONOMER-DIMER EQUILIBRIUM AND PHOTOCHEMICAL BEHAVIORS OF THE 1-METHYL-4-PHENYLPYRIDINYL RADICAL
Authors: Akiyama Kimio , Kubota Shozo , Ikegami Yusaku
Published: July 2006

A neutral free radical, 1-methyl-4-phenylpyridinyl radical, can be isolated by distillation under a vacuum. Equilibrium between the radical and the diamagnetic radical dimer, photochemical dissociation of the dimer with visible light, and photochemical decomposition of the radical with ultraviolet light to generate the phenyl radical have been demonstrated.
STRUCTURE OF A POTENT MUTAGEN ISOLATED FROM FRIED BEEF
Authors: Kasai Hiroshi , Yamaizumi Ziro , Shiomi Tomoko , Yokoyama Shigeyuki , Miyazawa Tatsuo , Wakabayashi Keiji , Nagao Minako , Sugimura Takashi , Nishimura Susumu
Published: July 2006

A new potent mutagen was isolated from fried beef. The molecular formula was determined as C11H11N5 by exact mass measurement. The chemical structure of this mutagen was determined to be 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (Me-IQx) by the analyses of its UV, mass and 1H-NMR spectra, and chemical synthesis.
A COMPUTER-AIDED SEQUENCE DETERMINATION OF A POLYPEPTIDE FROM THE MASSES AND EDMAN-DEGRADATION OF ITS CONSTITUENT PEPTIDE FRAGMENTS
Authors: Shimonishi Yasutsugu , Hong Yeong-Man , Kitagishi Toyoko , Katakuse Itsuo , Matsuo Takekiyo , Matsuda Hisashi , Hara Saburo , Ikenaka Tokuji , Izumi Yoshiharu
Published: July 2006

A new method is described for amino acid sequencing of a polypeptide or protein involving Edman-degradation and field-desorption mass spectrometry of its constituent peptides in mixtures. The sequences can be sought from the molecular weights and N-terminal amino acid residues of the constituent peptides and the phenylthiohydantoins released in each cycle of degradation using a computer program.
ELECTRON TRANSPORT ACROSS LIPID MEMBRANES PHOTOSENSITIZED BY AN AMPHIPHILIC ZINC PORPHYRIN
Authors: Katagi Toshiyuki , Yamamura Takeshi , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

Electron transport reaction from EDTA·2Na to methylviologen (MV2+) across the membrane of single-lamella vesicles of dipalmitoyl-l-α-phosphatidylcholine (DPPC) is photosensitized by an amphiphilic zinc porphyrinato complex, 5,10,15-tris-(l-methylpyridinium-4-yl)-20-(4-stearoxyphenyl)porphyrinatozinc(II) trichloride (Zn–P). This porphyrin complex can be incorporated into the vesicles symmetrically (on both sides of the membrane) or asymmetrically (only on the outer side). The symmetrical system facilitates the electron transport even in the absence of electron mediators.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON THE PHOTOINDUCED SUBSTITUTION REACTION OF 4-METHYLQUINOLINE-2-CARBONITRILE IN ETHANOL
Authors: Hata Norisuke , Hokawa Masahito
Published: July 2006

The photoinduced substitution reaction of 4-methylquinoline-2-carbonitrile in ethanol was found to undergo external magnetic field effect due to both HFI-J and Δg mechanisms. The present study is also considered to provide definitive evidence that the reaction proceeds primarily through hydrogen abstraction by the ring nitrogen from the hydrogen-bonded ethanol in the S1 state.
THE FORMATION OF 1- AND 3-SUBSTITUTED INDOLES IN THE REACTION BETWEEN INDOLE AND SODIUM GLYOXYLATE
Authors: Amat-Guerri Francisco , Martinez-Utrilla Roberto , Pascual Conrad
Published: July 2006

The reaction between indole and sodium glyoxylate under basic conditions produces, in addition to the expected sodium 3-indolylglycolate (3a), the 1-substituted derivative (4a). 3a partially condenses with unreacted indole and with 4a yielding the corresponding 3 ,3′-diindolyllmethane derivatives, 5a and 6a. All compounds were isolated and identified as methyl esters.
ION-BINDING PROPERTIES OF N,N′-DISUBSTITUTED DIAZA-CROWN ETHERS
Authors: Cho Iwhan , Chang Suk-Kyu
Published: July 2006

Derivatives of diaza-18-crown-6 and diaza-15-crown-5 were synthesized and their complexation properties were examined by solvent extraction and liquid membrane transport of various cations. N,N′-Bis(aminoalkyl) derivatives were particular in exhibiting unusually high but non-selective ion-binding efficiency toward various cations.
4-CHLOROPHENYL 5-CHLORO-8-QUINOLYL PHOSPHOROTETRAZOLIDE: A HIGHLY EFFICIENT PHOSPHORYLATING AGENT FOR OLIGORIBONUCLEOTIDE SYNTHESIS
Authors: Takaku Hiroshi , Nomoto Tadaaki , Kamaike Kazuo
Published: July 2006

4-Chlorophenyl 5-chloro-8-quinolyl phosphorotetrazolide (2) was a highly efficient phosphorylating agent for the synthesis of 5′-O-dimethoxytrityl-2′-O-tetrahydropyranylnucleoside 3′-(4-chlorophenyl, 5-chloro-8-quinolyl) phosphates (4). The fully protected ribonucleoside 3′-phosphotriesters 4 are key intermediates for the synthesis of oligoribonucleotides via phosphotriester approach.
A FACILE SYNTHESIS OF 1,3-CYCLOALKADIONES
Authors: Nishiguchi Ikuzo , Hirashima Tsuneaki , Shono Tatsuya , Sasaki Manji
Published: July 2006

1,3-Cycloalkadiones were prepared by the reaction of l,2-bis(trimethylsiloxy)cycloalkenes with chloromethyl methyl ether followed by treatment of the resulting 2-hydroxy-2-methoxymethyl cycloalkanones with potassium hydrogen sulfate. The first step of the reactions was effectively catalyzed by active zinc reagents prepared from zinc–copper and alkyl iodides.
THE REACTION OF 3-CYANO-2H-CYCLOHEPTA[b]FURAN-2-ONE WITH β, β-DISUBSTITUTED ENAMINES
Authors: Yasunami Masafumi , Chen Alice , Noro Yukio , Takase Kahei
Published: July 2006

The reaction of 3-cyano-2H-cyclohepta[b]furan-2-one with enamines derived from isobutyraldehyde gave 2-amino derivatives of 3-cyano-1,1-dimethyl-1,2-dihydroazulene, which on heating with sulfuric acid underwent the elimination of amines accompanied by the migration of the methyl group to give 1,2-dimethylazulenes.
USE OF MAGNETIC CIRCULAR DICHROISM IN THE SPIN-FORBIDDEN TRANSITIONS AS A STRUCTURAL PROBE OF CHROMIUM(III) COMPLEXES WITH EDTA ANALOGUES
Authors: Kaizaki Sumio , Mori Hisako
Published: July 2006

Well resolved magnetic circular dichroism spectra have been observed in the spin-forbidden d–d transitions of several Cr(III) complexes with edta analogues at ambient temperature. The positions of the doublet states thus detected have been correlated with the ring size of the chelates in the complexes concerned. From a structural point of view, their positional shifts have been elucidated in terms of the angular overlap model.
THE SYNTHESIS OF HEPTATRIDECA-, HEPTAPENTADECA-, AND HEPTAHEPTADECAFULVALENE DERIVATIVES
Authors: Morita Noboru , Asao Toyonobu , Ojima Juro , Wada Kazuyo
Published: July 2006

Title fulvalenes (6∼9) were synthesized in one step by the reaction of the corresponding large membered annulenones (1∼4) with 8-oxoheptafulvene, and 1H-nmr spectra were discussed in connection with their tropicity.
HIGH RESOLUTION 13C NMR STUDY OF (1→3)-β-d-GLUCANS BY CROSS POLARIZATION/MAGIC ANGLE SPINNING: EVIDENCE OF CONFORMATIONAL HETEROGENEITY
Authors: Saitô Hazime , Tabeta Ryoko , Harada Tokuya
Published: July 2006

Conformation of various (1→3)-β-d-glucans in solid state was examined by 13C cross polarization/magic angle spinning NMR spectroscopy. It was found that high molecular-weight glucans adopt mainly helix form, whereas low molecular weight ones take considerable proportion of random-coil form in addition to the helix in solid.
PREPARATION AND SPECTROSCOPIC PROPERTIES OF A PAIR OF GEOMETRICAL ISOMERS, cis- AND trans-BIS (ACETYLACETONATO) BIS (DIMETHYLPHENYLPHOSPHINE)COBALT(III) COMPLEXES
Authors: Kashiwabara Kazuo , Katoh Katsuaki , Fujita Junnosuke , Nishikawa Hiroaki , Shibata Muraji
Published: July 2006

A pair of geometrical isomers, cis- and trans-bis(acetylacetonato)bis(dimethylphenylphosphine)cobalt(III) complexes were prepared, and the structures were assigned on the basis of the 1H and 13C NMR spectra. The trans isomer shows a strong absorption band in the first absorption band region, its intensity being 40 times as large as that of the cis isomer.
SYNTHESIS OF MEMBRANE SUBSTANCES: PHOSPHATIDYL-α-DIGLUCOSYL DIGLYCERIDE AND RELATED GLYCOLIPIDS
Authors: Boeckel Stan A A Van , Boom Jacques H Van
Published: July 2006

The recently developed tetraisopropyldisiloxane-1,3-diyl protecting group enabled us to synthesize a naturally occurring phosphatidyl-α-diglucosyl diglyceride as well as the glycolipid α-diglucosyl diglyceride and a derivative thereof which is acylated on the 6′-position by a fatty acid.
ELECTRON SPIN RESONANCE OF THIAHETEROHELICENE RADICAL ANIONS
Authors: Tanaka Hisao , Ogashiwa Susumu , Kawazura Hiroshi
Published: July 2006

Hyperfine couplings in radical anions of benzodithiophene, [5]-thiaheterohelicene, and [7]-thiaheterohelicene were assigned by using their deuteriated compounds. The couplings calculated by a simple π-MO method agreed with the experimental ones, indicating an overwhelming contribution of π-conjugation to the spin distribution in the radicals, irrespective of the inherently staggered structure.
TOTAL SYNTHESIS OF CURZERENONE AND EPICURZERENONE
Authors: Miyashita Masaaki , Kumazawa Toshiaki , Yoshikoshi Akira
Published: July 2006

Curzerenone and epicurzerenone were synthesized by means of a combination of γ-ketoester synthesis and 3-methylfuran annulation both of which utilize nitroolefins as synthons. Starting material, methyl 2-methyl-4-oxo-2-vinylpentanoate, was prepared by the Lewis acid-promoted reaction of l-methoxy-2-methyl-l-[(trimethylsily)oxy]-1,3-butadiene and 2-nitropropene, while key intermediate 3,6-dimethyl-6-vinyl-6,7-dihydrobenzofuran-4(5H)-one was assembled by the KF-catalyzed reaction of 5-methyl-5-vinylcyclohexane-l,3-dione and 1-nitro-1-phenylthiopropene.
SYNTHESIS OF 2,7-BIS(DIMETHYLAMINO)-PYRENE AND -TETRAHYDROPYRENE AND ELECTRICAL CONDUCTIVITIES OF THEIR CT COMPLEXES
Authors: Natsume Bunji , Nishikawa Naomi , Kaneda Takahiro , Sakata Yoshiteru , Misumi Soichi , Enoki Toshiaki , Inokuchi Hiroo
Published: July 2006

The synthesis of the title new π-donors using a unique transannular reaction of [2.2]metacyclophane and the electrical conductivities of their CT complexes with a few π-acceptors were reported.
INFRARED STUDY OF CROTONALDEHYDE OXIDATION BY 12-MOLYBDOPHOSPHORIC ACID
Authors: Tsai Tian-hsi , Maruya Ken-ichi , Ai Mamoru , Ozaki Atsumu
Published: July 2006

IR spectra of H3PMo12O40 (HPA) with adsorbed crotonaldehyde disclosed that HPA is reduced by crotonaldehyde only in the presence of water, giving furan as the oxidation product. Water is evidentially involved in the reaction path of crotonaldehyde oxidation, being consistent with water-enhanced catalytic oxidation of crotonaldehyde on HPA.
RETRO-DIELS–ALDER REACTION OF ASATONE: SYNTHESIS OF HETEROTRQPANONE AND ISOHETEROTROPANONE
Authors: Yamamura Shosuke , Niwa Masatake
Published: July 2006

Two novel neolignans, heterotropanone and isoheterotropanone, have been synthesized by retro-Diels–Alder reaction of asatone in l-allyl-3,4,5-trimethoxybenzene. These two neolignans have also been obtained on thermal reaction of asatone followed by methylation.
THE HOMOLOGATION OF METHANOL. THE MODIFICATION OF COBALT CATALYST BY DIPHOSPHINES
Authors: Sugi Yoshihiro , Bando Ken-ichiro , Takami Yasuo
Published: July 2006

Cobalt iodide modified by α,ω-bis(diphenylphosphino)alkane (PCnP; n=1–6) efficiently catalyzes the homologation of methanol to ethanol. The ethanol selectivity as high as 89% was achieved by using PC6P as the ligand.
PARA-PREFERENTIAL ANODIC CHLORINATION OF ALKOXYBENZENES
Authors: Matsuda Yoshiharu , Hayashi Hiroyasu
Published: July 2006

Anodic chlorination of methoxy- and ethoxybenzenes yielded p-alkoxychlorobenzenes preferentially. The p-/o- ratios were 34.5 in N,N-dimethylacetamide-LiCl and 17.1 in N,N-dimethylformamide-LiCl. In the former case, the current efficiency for producing p-chloromethoxybenzene was 95.8% at Pt anode.
STEREOSELECTIVE MICELLAR CATALYSIS IN THE HYDROLYSIS OF ENANTIOMERIC ESTERS BY DIPEPTIDE DERIVATIVES CONTAINING HISTIDINE RESIDUE
Authors: Ihara Yasuji , Kunikiyo Noriko , Kunimasa Tomoko , Nango Mamoru , Kuroki Nobuhiko
Published: July 2006

The catalytic hydrolysis of enantiomeric substrates is examined using optically active dipeptide derivatives containing histidine residue in the presence of CTABr micelles. A very high stereoselectivity, kc(L)/kc(D), of 12.2 is observed in the reaction with the enantiomers of p-nitrophenyl N-methoxycarbonylphenylalanate (MocPheONp) and N-(benzyloxycarbonyl-l-leucyl)-l-histidine (ZLeuHis).
SURFACE STATES OF n-TYPE TiO2 ELECTRODE IN AQUEOUS SOLUTION
Authors: Kobayashi Kenklchiro , Aikawa Yoshihiro , Sukigara Mitsunori
Published: July 2006

The basic properties of surface states were studied by the capacitance measurements for TiO2 electrode to elucidate the role of the surface states on the charge transfer at electrode–electrolyte interface. The surface state density and its energy were obtained respectively to be Nt=1.5×1012 cm−2 and Et=0.4 eV below the bottom of the conduction band.
THEORETICAL CONSIDERATIONS ON THE PREFERENCE OF ALKYL/PHENYL APPROACHED CONFORMATIONS IN 1-ALKYL-2-PHENYL COMPOUNDS Ar–CH(CH3)–X-R
Authors: Hirota Minoru , Abe Kazuhlsa , Sekiya Toshlyuki , Tashiro Hiroshi , Nishio Motohiro , Osawa Eiji
Published: July 2006

The preferred conformations of t-butyl 1-phenylethyl sulfoxide, t-butyl 1-phenylethyl ketone, 2,2,4-trimethyl-4-phenylpentane-3-ol, and related compounds were estimated by the empirical molecular force field approach. The results are in accordance with the experiments, showing that the conformation in which the t-butyl group is trans to the methyl and gauche to the phenyl group is the most stable. The repulsive force between the t-butyl and the methyl groups is the main factor and the attractive van der Waals force is the secondary factor in determining the favored conformation.
MERCURY DISTRIBUTION IN THE NORTHWEST PACIFIC OCEAN NEAR JAPAN ISLANDS
Authors: Takahashi Jun’ichi , Haraguchi Hiroki , Fuwa Keiichiro
Published: July 2006

Mercury in the seawater collected from the Northwest Pacific Ocean was determined by a sensitive mercury analyzer set on the shipboard, where the mercury resonance line at 185.0 nm was used for atomic absorption measurement. The horizontal and vertical distributions of mercury will be reported in this communication.
FIRST OBSERVATION OF CIDNP SIGNALS DUE TO PORPHYRIN DURING THE COURSE OF LIGHT-INDUCED ELECTRON-TRANSFER FROM PORPHYRIN TO QUINONE
Authors: Maruyama Kazuhiro , Furuta Hiroyuki , Otsuki Tetsuo
Published: July 2006

The CIDNP signals due to porphyrin as well as quinone were observed upon illumination of porphyrin in the presence of quinone, indicating unambiguously the light-induced electron-transfer from porphyrin to quinone.