bluuebunny/crossref_metadata_2025 huggingface dataset:
INSERTION REACTIONS OF CALCIUM ATOM INTO Si–Cl AND Ge–Cl BONDS
Authors: Mochida Kunio , Manishi Masaharu
Published: July 2006

Calcium atom is inserted into Si–Cl and Ge–Cl bonds of organosilylchlorides and organogermylchlorides to give the corresponding organosilylcalcium chlorides and organogermylcalcium chlorides, respectively.
THE EFFECTIVENESS OF A WEAK BASE IN THE OLEFIN SYNTHESIS FROM β-HYDROXYALKYLPHOSPHONATES
Authors: Kawashima Takayuki , Ishii Takafumi , Inamoto Naoki
Published: July 2006

β-Hydroxyalkylphosphonates were treated with a weak base such as potassium carbonate in N,N-dimethylformamide to give the corresponding olefins in good yields.
SH2 REACTIONS OF SELENOSULFIDES WITH CARBON RADICALS
Authors: Yoshida Masato , Cho Toshitsura , Kobayashi Michio
Published: July 2006

o-Nitrophenyl phenylselenyl sulfide suffered SH2 attack by carbon radicals on selenium atom to give selenide and thiyl radical; the relative rate constant of the selenosulfide with phenyl radical was compared with those of the other selenium compounds.
A NOVEL SYNTHESIS OF CYCLOHEPTA[ 2,1-b:2,3-b′]DI[1,4]BENZOXAZINES AND 14H[1,4]BENZOXAZINO[3′,2′:3,4] CYCLOHEPTA[1,2-b][1,4]BENZOXAZINES
Authors: Nozoe Tetsuo , Okai Harue , Wakabayashi Hidetsugu , Ishikawa Sumio
Published: July 2006

The title compounds, namely, the chiral acetals and their positional isomers were efficiently prepared by heating 6-bromocyclohepta[b][1,4]benzoxazines and the substituted o-aminophenols at 120 °C in acetic acid.
RESOLUTION, ABSOLUTE CONFIGURATION, AND PHOTORACEMIZATION OF CHIRAL TROPONOID ACETALS, CYCLOHEPTA[2,1-b:2,3-b′]DI[1,4]BENZOXAZINES
Authors: Okamoto Yoshio , Honda Shiro , Yuki Heimei , Nakamura Hikaru , Iitaka Yoichi , Nozoe Tetsuo
Published: July 2006

The title chiral troponoid compounds were resolved in optically pure forms by high-performance liquid chromatography on a chiral poly(triphenylmethyl methacrylate) column. The compounds showed large optical rotations. The absolute configuration of (−)-3,12-dichloro derivative was found to be R by X-ray analysis. Resolved enantiomers were racemized upon UV irradiation in solution.
HYDROGEN-TRANSFER FROM ALCOHOLS TO KETONES CATALYZED BY PHOTOGENERATED ACTIVE SPECIES FROM A STABLE HYDRIDOPHOSPHONITECOBALT(I) COMPLEX
Authors: Onishi Masayoshi , Matsuda Masahiko , Hiraki Katsuma
Published: July 2006

Pyrex-filtered irradiation of a thermally inert complex [CoH{PPh(OEt)2}4] generated a coordinatively unsaturated active hydrido species “CoH{PPh(OEt)2}3”, which catalyzed hydrogen-transfer from secondary alcohols to ketones. The reaction was “photoassisted” rather than “true photocatalytic”.
NEW LOW-VALENT TITANIUM CATALYZED REACTION OF CHLORODIFLUOROMETHYL KETONES LEADING TO α,α-DIFLUORINATED β-HYDROXY KETONES
Authors: Ishihara Takashi , Yamanaka Tohru , Ando Teiichi
Published: July 2006

Various chlorodifluoromethyl ketones underwent the aldol-type reaction with aldehydes or ketones by the action of titanium tetrachloride and zinc reagent in tetrahydrofuran at room temperature to give moderate to good yields of α,α-difluorinated β-hydroxy ketones.
SYNTHESIS OF BOTH ENANTIOMERS OF ERYTHRO-6-ACETOXY-5-HEXADECANOLIDE, THE MAJOR COMPONENT OF A MOSQUITO OVIPOSITION ATTRACTANT PHEROMONE
Authors: Sato Toshio , Watanabe Makoto , Honda Naoki , Fujisawa Tamotsu
Published: July 2006

Stereoselective synthesis of both (5S,6R)-(+)- and (5R,6S)-(−)-6-acetoxy-5-hexadecanolides, the major component of a mosquito oviposition attractant pheromone, was achieved from (S)-2-cyclohexen-1-ol.
EVIDENCE IN THE FORMATION OF HEXACOBALT CARBONYL SPECIES ON OXIDE SUPPORTS
Authors: Nakamura Ryuichi , Okada Norio , Oomura Akihiro , Echigoya Etsuro
Published: July 2006

Interaction between Co2(CO)8 and TiO2, NaY zeolite, or dehydroxylated alumina resulted in the formation of a surface cobalt cluster carbonyl whose structure is probably [Co6(CO)16−n(Ls)n](Ls : the surface O2− or OH group). On the alumina the cluster was observed only at the limited Co loadings. On zeolite the formation of [Co(CO)4]− and [Co6(CO)15]2− were also presumed.
THE VOLUMETRIC BEHAVIOR OF AQUEOUS MIXTURES OF HYDROCARBON AND FLUOROCARBON SURFACTANTS
Authors: Harada Shigeharu , Sahara Hideko
Published: July 2006

The mean partial molal volumes (\barV) were determined for ca. 1:1 mixtures of sodium pentadecafluorooctanoate (SPFO) and sodium decyl sulfate (SDeS) or sodium dodecyl sulfate (SDS). The concentration dependence of \barV of the SPFO-SDeS mixture was quite similar to that for the respective components, while the \barV of the SPFO-SDS mixture revealed two stages of micelle formation.
GAS-PHASE HYDROFORMYLATION OF ETHYLENE OVER SUPPORTED PALLADIUM CATALYSTS AT ATMOSPHERIC PRESSURE
Authors: Kobayashi Masahiro
Published: July 2006

The palladium-exchanged silica catalysts have almost the same activities as the rhodium catalyst in the gas-phase hydroformylation of ethylene at 50–110 °C and 1 atm.
PROTON AND NITROGEN-14 ENDOR SPECTRA OF AMINOXYL SPIN ADDUCTS FROM PBN
Authors: Janzen Edward G , Oehler Uwe M
Published: July 2006

Both N-14 and proton hyperfine splittings have been observed in the ENDOR spectra of spin adducts of phenyl t-butyl nitrone (PBN). From the differences in relative intensities of the ENDOR doublets the relative signs of the coupling constants can be ascertained.
ENT-KAURENOID METHYL ESTERS FROM Viguiera stenoloba, STRUCTURAL REVISION OF STENOLOBIN AND ITS BIOMIMETIC CONVERSION TO ZOAPATLIN
Authors: Delgado Guillermo , Vivar Alfonso Romo De
Published: July 2006

The structure of stenolobin, a diterpene from Viguira stenoloba, was revised to 5. The new diterpene, 15α-angeloyloxy stenolobin, was also isolated from the same plant source. The biomimetic transformation of stenolobin (5) to zoapatlin is described.
RHODIUM-CATALYZED STEREOSELECTIVE DEHYDROGENATION OF CIS- AND TRANS-METHYLCYCLOHEXANOLS BY MOLECULAR OXYGEN
Authors: Okamoto Tadashi , Sasaki Ken , Oka Shinzaburo
Published: July 2006

Methylcyclohexanols were dehydrogenated stereoselectively by rhodium phosphine catalyst and molecular oxygen. The less stable stereoisomers were consumed preferentially.
SYNTHESIS AND APPLICATION OF α-METHOXYALLYL SULFIDES AS A NOVEL α-METHYLENATED ACYL ANION EQUIVALENT
Authors: Mandai Tadakatsu , Takeshita Masahiro , Kawada Mikio , Otera Junzo
Published: July 2006

α-Methoxyallyl sulfides prepared from methoxy(phenylthio)methane proved to be a novel acyl anion equivalent providing a new synthetic method for α-methylenated ketones.
SYNTHESES OF PERILLENE AND ROSEFURAN FROM COMMON STARTING MATERIALS
Authors: Takano Seiichi , Morimoto Masamichi , Satoh Shigeki , Ogasawara Kunio
Published: July 2006

Two structurally isomeric furanomonoterpenes perillene and rosefuran have been synthesized using methallyl alcohol and prenyl chloride as common starting materials.
TiO2-SUPPORTED Fe–Co, Co–Ni, AND Ni–Fe ALLOY CATALYSTS FOR FISCHER-TROPSCH SYNTHESIS
Authors: Arai Hiromichi , Mitsuishi Kenshi , Seiyama Tetsuro
Published: July 2006

The activities of TiO2-supported bimetallic catalysts of Fe–Co, Co–Ni and Ni–Fe for CO conversion were greater than those of pure metal catalysts. The selectivities of alloy catalysts relative to pure metal catalysts were shifted to higher molecular hydrocarbons.
BIPHASIC SUBSTRATE-INCORPORATION BY SYNTHETIC MEMBRANE VESICLES
Authors: Murakami Yukito , Nakano Akio , Yoshimatsu Akira
Published: July 2006

The substrate-binding property of single-walled vesicles formed with N,N-ditetradecyl-Nα-(6-trimethylammoniohexanoyl)-l-alaninamide bromide was investigated from both static and dynamic viewpoints, hexyl p-nitrophenyl ether being used as a hydrophobic pseudo-substrate. The substrate-binding equilibrium was achieved through a two-step mechanism.
FACILE SYNTHESIS AND CONVERSION OF MAIN SKELETON OF ASPIROCHLORIN TO 3-AMINOCOUMARIN DERIVATIVES
Authors: Shin Chung-gi , Nakajima Yoshiharu , Sato Yoshiaki
Published: July 2006

The condensation of 1,4-diacetyl-2,5-piperazinedione with salicylaldehyde gave 1-acetyl-(Z)-3-salicylidene-2,5-piperazinedione and 3-(N-acetylglycyl)aminocoumarin by ca. 1:1 ratio. The former was readily converted with t-BuOCl into spiro[3H-benzofuran-2,3′-(2′,5′-dioxo)-piperazine] derivative which has a main skeleton of aspirochlorin.
NICKEL(II) COMPLEXES WITH NOVEL TETRADENTATE AMINOCARBOXYLATE LIGANDS
Authors: Fukuda Yutaka , Miyamae Hiroshi , Yamagata Keiko , Sone Kozo
Published: July 2006

Nickel(II) chelates with 1,4-diazacycloheptanediacetate(dachda) and its alkyl derivatives were newly obtained, and characterized by their electronic spectra and magnetic moments. The crystal structure of one of them, studied by X-ray diffraction method, confirmed the proposed square planar structure.
SYNTHESIS OF SUBSTITUTED BUTATRIENES AND NOVEL STRUCTURES OF THEIR O2-OXIDATION PRODUCTS
Authors: Iyoda Masahiko , Nishioka Kazuhiko , Nose Masanori , Tanaka Shigeyoshi , Oda Masaji
Published: July 2006

Synthesis of three 2,3-diiodo-1,3-dienes and conversion of these dienes into butatrienes are described. 2,5-Dimethylhexa-2,3,4-triene polymerizes on exposure to air to give the polymeric peroxide (C6H12O2)n which is reassigned as the structure containing acetylene and peroxide units.
REACTIONS OF METHYLYTTERBIUM IODIDE WITH ACTIVE HYDROGEN COMPOUNDS
Authors: Yokoo Kazuhiro , Kijima Yasushi , Fujiwara Yuzo , Taniguchi Hiroshi
Published: July 2006

Methylytterbium iodide (CH3YbI) has been found to react with active hydrogen compounds such as phenylacetylene and fluorene to give phenylpropynoic acid and fluorenol in modest yields. The reactivity of CH3YbI to these active hydrogen compounds is far higher than that of CH3MgI.
THE CRYSTAL STRUCTURE AND ELECTRICAL RESISTIVITY OF (BPDT-TTF)2I3
Authors: Kobayashi Hayao , Takahashi Miyuki , Kato Reizo , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

The crystal of (BPDT-TTF)2I3 belongs to triclinic system with the lattice constants of a=16.350(4), b=9.246(3), c=6.843(2) Å, α=111.11(2), β=93.21(2), γ=91.39(2)°. The structure is isomorphic with the organic superconductor, β-(BEDT-TTF)2I3. The resistivity decreases with increasing the pressure and reaches 0.05 Ω cm at 10 kbar, though (BPDT-TTF)2I3 remains semiconductive up to at least 10 kbar.
PHOTOCHEMICAL REACTION OF 2-ALKENOYL-3,5-DIMETHYL-1,4-BENZOQUINONES WITH ALCOHOL
Authors: Maruyama Kazuhiro , Iwamoto Hidetoshi , Soga Osamu , Takuwa Akio
Published: July 2006

Irradiation of 2-alkenoyl-3,5-dimethyl-1,4-benzoquinones in alcohol under nitrogen atmosphere afforded the two isomeric adducts; benzofuranone derivatives and novel alkenyl ether derivatives. The mechanism of formation of these adducts is discussed.
CRYSTAL STRUCTURE AND REFLECTION SPECTRA OF (DBTTF)2-(Cu2Cl6) COMPLEX
Authors: Tanaka Masashi , Honda Masako , Katayama Chuji , Kamiya Kohji , Tanaka Jiro
Published: July 2006

X-Ray and optical reflection measurements of (DBTTF)2-(Cu2Cl6) single crystals were carried out. The single crystal of the complex consists of stacking columns of the cation molecules DBTTF+. The analysis of the reflection spectra of (DBTTF)2-(Cu2Cl6) single crystals shows that the electronic structure of DBTTF+ cation molecules is typical of the dimer type configuration.
PREPARATION AND PROPERTIES OF GROUP 8 TRANSITION METAL ALKOXIDES RELEVANT TO CATALYTIC HYDROGENATION OF KETONES TO ALCOHOLS
Authors: Hayashi Yoshinori , Komiya Sanshiro , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

Alkoxo complexes, M(OR)Ln and MH(OR)Ln (M=Co, Rh, Ru; L=PPh3; R=CH(CF3)2, CHPh(CF3)), have beeen prepared by insertion of fluoroketones into M–H bonds in CoH(N2)L3, RhHL4, and RuH2L4. Hydrogenolysis of the Ru- and Rh-alkoxo complexes with H2 or ethanol liberates corresponding fluoroalcohols in good yields. Catalytic activity in hydrogenation of ketones is correlated with the ease of hydrogenolysis of the alkoxo complexes.
THE PREPARATION AND CHIROPTICAL PROPERTIES OF CAGE-SHAPED PENTACYCLIC HYDROCARBONS; [m.n.0]TRIBLATTANES. HORSE LIVER ALCOHOL DEHYDROGENASE MEDIATED REDUCTION OF PENTACYCLO[5.5.0.02,6.03,9.05,8]DODECAN-4-ONE
Authors: Naemura Koichiro , Katoh Tohru , Chikamatsu Hiroaki , Nakazaki Masao
Published: July 2006

Diazomethane ring expansion of (+)-[1.1.0]triblattan-4-one and (−)-[2.1.0]triblattan-4-one gave [m.1.0]triblattanes (m=3–5) and [m.2.0]triblattanes (m=3–6) respectively, all of which are levorotatory. HLADH mediated reduction of (±)-[3.1.0]triblattan-4-one gave (−)-[3.1.0]triblattan-4-one which was converted into [m.3.0]triblattanes (m=3,4). These are dextrorotatory in spite of having the central core fixed in an M-helical conformation.
PHOTOCHEMISTRY OF DIBENZO-1,1,2,2,3,3 -HEXAMETHYL-1,2,3-TRISILACYCLOHEPTA-4,6-DIENE AND THE GERMANIUM ANALOG. GENERATION OF TETRAMETHYLDISILENE BY FREE-RADICAL DISPROPORTIONATION AND THE FIRST SPECTROSCOPIC DETECTION OF DIMETHYLGERMYLENE
Authors: Sakurai Hideki , Sakamoto Kenkichi , Kira Mitsuo
Published: July 2006

Photolysis of the title compound afforded silafluorene and dibenzo-1,2-disilacyclohexadiene as primary photoproducts. Two reactive intermediates, tetramethyldisilene and dimethylsilylene, were detected by trapping. The dimethylgermylene, derived from the germanium analog, was first observed by electronic spectra.
ULTRAVIOLET, CHARGE-TRANSFER, AND PHOTOELECTRON SPECTRA OF PHENYL-SUBSTITUTED GROUP 4B CATENATES, PhMe2E-E′Me3 (E = Si, Ge; E′ = C, Si, Ge, Sn)
Authors: Sakurai Hideki , Ichinose Michiko , Kira Mitsuo , Traylor Teddy G
Published: July 2006

UV, CT, and PE spectra of eight phenyl-substituted silanes and germanes of the type of PhMe2E-E′Me3 (E = Si, Ge; E′ = C, Si, Ge, Sn) are recorded. Extensive σ–π conjugation between σ(E-E′) and π orbitals is demonstrated to determine the unique electronic structures of these compounds.
EPIMERIZATION IN THE PHEOPHYTIN a/a′ SYSTEM
Authors: Watanabe Tadashi , Nakazato Masataka , Konno Mitsuo , Saitoh Sadao , Honda Kenichi
Published: July 2006

By means of a recently developed high-performance liquid chromatographic procedure with high resolution, a kinetic aspect of the epimeric interconversion between pheophytin a and a′ has been investigated for the first time.
ELEMENTAL SULFUR-CATALYZED SYNTHESIS OF N,N′-DISUBSTITUTED 1,3-DIIMINOISOINDOLINES FROM PHTHALONITRILE WITH AMMONIA AND AMINES
Authors: Sato Ryu , Senzaki Toshihide , Shikazaki Yoshihiro , Goto Takehiko , Saito Minoru
Published: July 2006

Various N,N′-disubstituted 1,3-diiminoisoindolines were synthesized by.the elemental sulfur-catalyzed reaction of phthalonitrile with ammonia and some primary amines in excellent yields. Several functionalized isoindolines were also obtained in high yields.
CONVENIENT SYNTHESIS OF VINYL KETONES VIA A NEW THREE CARBON HOMOLOGATING AGENT
Authors: Tuchinda Patoomratana , Prapansiri Vichukorn , Naengchomnong Waree , Reutrakul Vichai
Published: July 2006

Syntheses of vinyl ketones and the himachalene skeleton from 4-phenylthio-N,N -dimethylaminobutyronitrile were demonstrated.
A NEW SYNTHETIC ROUTE TO α-METHYLENE AND β-METHYLENE-γ-BUTYROLACTONES VIA HOMOLYTIC CARBOCYCLIZATION
Authors: Moriya Osamu , Okawara Makoto , Ueno Yoshio
Published: July 2006

α-Methylene-γ-butyrolactones were prepared using butoxyallene via stereoselective homolytic carbocyclization of vinyl radicals, similarly, β-methylene analogues were also prepared.
HIGHLY SELECTIVE DETERMINATION OF TRACE METAL IONS WITH 2,2′-DIHYDROXYAZOBENZENE BY ION-PAIR REVERSED-PHASE PARTITION HPLC-SPECTROPHOTOMETRIC DETECTION SYSTEM
Authors: Hoshino Hitoshi , Yotsuyanagi Takao
Published: July 2006

The 2,2′-dihydroxyazobenzene (DHAB) chelates of AlIII, CoII, VV, and FeIII ions give the well-resolved peaks on a Yanapak ODS-T column using an aqueous methanol mobile phase containing tetrabutylammonium bromide. The metal ions in the ng cm−3 to sub-μg cm−3 range are selectively determined with 0.01 absorbance unit full-scale at 510 nm. The versatility of DHAB derivatives in the HPLC system is demonstrated.
PHOTOCATALYSIS OF ZINC SULFIDE MICROCRYSTALS IN REDUCTIVE HYDROGEN EVOLUTION IN WATER/METHANOL SYSTEMS
Authors: Yanagida Shozo , Kawakami Hiroshi , Hashimoto Kazuhito , Sakata Tadayoshi , Pac Chyongjin , Sakurai Hiroshi
Published: July 2006

In photocatalytic H2 evolution using an aq. methanol system, high quality microcrystalline(cubic) ZnS powders have been found to be active under an appropriate light intensity, which is comparable in activity with freshly prepared ZnS suspensions. Comparison of photoactivities of some commercial ZnS with their surface properties has revealed that the surface purity of ZnS plays an important role in the photocatalysis, while the luminescence observed at 445 nm for the high quality ZnS microcrystals was not affected in the presence of oxygen, diethylamine, or methylviologen.
NEW SYNTHETIC IONOPHORES EXHIBITING SELECTIVITY FOR ALKALINE EARTH METAL IONS
Authors: Taguchi Kazuhiro , Hiratani Kazuhisa , Sugihara Hideki , Iio Kokoro
Published: July 2006

New noncyclic polyethers, which contain 3-carboxy-2-hydroxyphenyl group as one terminal group were prepared. These polyethers exhibit the ability to transport alkaline earth metal ions through chloroform liquid membrane, but not to transport alkali metal ions. Highly Ba++ -selective ionophores were synthesized in this series.
A CONVENIENT METHOD FOR THE CONSTRUCTION OF β-LACTAM COMPOUNDS FROM β-AMINO ACIDS USING 2-CHLORO-1-METHYLPYRIDINIUM IODIDE AS CONDENSING REAGENT
Authors: Huang Huamin , Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

Various (β-lactams are prepared from the corresponding β-amino acids under mild reaction conditions in high yields by employing 2-chloro-1-methylpyridinium iodide as a condensing reagent.
STEREOSELECTIVE PREPARATION OF ACYCLIC syn-1,3-AMINO ALCOHOLS FROM β-HYDROXY KETONES
Authors: Narasaka Koichi , Ukaji Yutaka
Published: July 2006

syn-1,3-Amino alcohols are prepared in good yields by the stereoselective reduction of β-hydroxy ketone-O-benzyloximes derived from acyclic β-hydroxy ketones with lithium aluminium hydride.
A DIRECT 13C and 1H NMR STUDY ON THE CATION SOLVATION OF ALUMINUM PERCHLORATE SOLUTIONS IN AQUEOUS MIXTURE OF 3-METHYLSYDNONE
Authors: Yokoi Masatoki , Usami Yoshinori , Kubota Eiji
Published: July 2006

The solvation of 3-methylsydnone molecule to aluminum ion in water–3-methylsydnone mixture was studied by 13C and 1H NMR signal area measurements on the aluminum perchlorate solutions. 3-Methylsydnone solvation number was found to be 0.5 to 2.5 for the solution at mole ratios of Al to water greater than 1 : 20.
TEMPLATE SYNTHESIS OF POLYMER SCHIFF BASE COBALT(III) COMPLEX AND FORMATION OF SPECIFIC CAVITY FOR CHIRAL AMINO ACID
Authors: Fujii Yuki , Kikuchi Katsuhiro , Matsutani Katsuhiro , Ota Koji , Adachi Masami , Syoji Masato , Haneishi Ikuo , Kuwana Yasuo
Published: July 2006

Template synthesis for Δ-β2-[Co(Schiff base)(D-phe)] (Schiff base = 4-(p-vinylbenzyloxy)-sal2-(R,R)-chxn) was carried out by copolymerizing the complex with styrene and divinylbenzene. After treating the formed polymer complex gel with HCl, the gel took in D-phe preferentially (maximum optical purity = 74%), when it reacted with an excess of DL-PHE.
PHOTOVOLTAIC SANDWICH CELLS BASED ON THE CHLOROPHYLL A / WET POLY(VINYL ALCOHOL) JUNCTION
Authors: Uehara Kaku , Yoshikawa Takao , Katoh Masakazu , Tanaka Makoto , Isomatsu Norio , Hiraishi Masanori
Published: July 2006

A new type of photovoltaic device was made by contacting chlorophyll a (chl) layer with wet poly(vinyl alcohol) (PVA) film between two electrodes to give a cell such as Au/chl/PVA/Au. The cell showed a rectifying effect. It was suggested that the charge-separation upon irradiation of visible light might occur at the junction between chl layer and PVA film.
A NEW SYNTHESIS OF α-IODO CARBOXYLIC ACID USING IODINE-COPPER SALT
Authors: Horiuchi C Akira , Satoh J Yasuo
Published: July 2006

Direct α-iodination of some carboxylic acids, namely, acetic acid, propionic acid, butyric acid, and valeric acid, using iodine-copper salt, gave the corresponding α-iodo carboxylic acid in high yield. This new synthetic method afforded several advantage over classical α-iodo carboxylic acid procedures.
REACTION OF PHOTOGENERATED VINYL CATIONS WITH AMBIDENT ANIONS
Authors: Kitamura Tsugio , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Photolysis of vinyl bromides with cyanate anion In a two-phase system gave only isoquinolinones as the N-site attacked products. However, the photolysis with thiocyanate anion gave both the N-site attacked products, isothioquinolinones or vinyl isothiocyanates, and the S-site attacked products, vinyl thiocyanates.
STANNOUS (II) TRIFLATE PROMOTED REARRANGEMENT OF β-KETO SULFOXIDES. SYNTHESIS OF 1,4-DIKETONES
Authors: Shimizu Makoto , Akiyama Takahiko , Mukaiyama Teruaki
Published: July 2006

Stannous triflate promotes rearrangement of β-keto sulfoxides to generate α-thiocarbocation, which in turn react with silyl enol ethers to give 2-arylsulfenyl-1,4-diketones in good yields.
A RATIONALIZATION OF ORIENTATION IN NUCLEOPHILIC AROMATIC PHOTOSUBSTITUTION
Authors: Mutai Kiyoshi , Nakagaki Ryoichi
Published: July 2006

For rationalization of regioselectivities observed in nucleophilic aromatic photosubstitutions, two rules discriminating orientation-controlling MO’s, based on reaction mechanisms and frontier orbital theory, are proposed.
STEREOSELECTIVE TRANSFORMATION OF 2,4-ALKADIENOIC ESTERS TO THE 3,5-DIENOIC ISOMERS WITH LITHIUM DIISOPROPYLAMIDE (LDA)
Authors: Tsuboi Sadao , Kuroda Akihisa , Masuda Toshihide , Takeda Akira
Published: July 2006

Treatment of 2(E),4(Z)-alkadienoic esters with lithium diisopropylamide (LDA) at −80 °C gave 3(E),5(E)-isomers with 81–98% stereoselectivity. In contrast, treatment of 2(E),4(E)-isomers with LDA gave 3(E),5(z)-isomers with 72–80% stereoselectivity.
A NOVEL SYNTHESIS OF THE α-HYDROXYKETONE MOIETY OF ANTHRACYCLINONES BY THE USE OF 2-TRIMETHYLSILYLETHYNYLCERIUM(III) REAGENTS
Authors: Suzuki Michiyo , Kimura Yoshikazu , Terashima Shiro
Published: July 2006

2-Trimethylsilylethynylcerium(III) reagents were found to efficiently react with 1,2,3,4-tetrahydronaphthalene-2-one derivatives, giving the corresponding adducts in high yields. Hydration of the adducts readily afforded the α-hydroxy methyl ketones which are versatile synthetic intermediates of natural and unnatural anthracyclinones.
ELECTRODE-CATALYZED [2+2]CYCLOREVERSION REACTION OF PHENYLATED BIS-HOMOCUBANES
Authors: Takahashi Yasutake , Sato Katsuhiro , Miyashi Tsutomu , Mukai Toshio
Published: July 2006

The constant potential anodic oxidation reaction of phenylated bis-homocubanes involved the [2+2]cycloreversion to give the dienes via a radical chain mechanism.
CYCLOPHANES CONTAINING NITROGEN ATOMS IN THE BRIDGED CHAINS. PHOTOCHROMISM OF N,N′-BIS(ARYLSULFONYL)-2,11-DIAZA[3.3]PARACYCLO(9,10)ANTHRACENOPHANES1)
Authors: Usui Masao , Nishiwaki Tohru , Anda Kinji , Hida Mitsuhiko
Published: July 2006

Diaza[3.3]paracyclo(9,10)anthracenophane derivatives were synthesized under the high dilution conditions. These cyclophanes showed reproducible photochromism both in solution and solid.
SPIN TRAPPING STUDY ON THE GENERATION MECHANISM OF ACTIVE OXYGEN RADICALS IN THE ENZYMATIC REDUCTION OF QUINOID ANTITUMOR AGENTS
Authors: Tero-Kubota Shozo , Ikegami Yusaku , Sugioka Katsuaki , Nakano Minoru
Published: July 2006

Generation of O2− from enzymatic reduction of purified aclacinomycin A with cytochrome P-450 reductase and NADPH in the presence of O2 was demonstrated by spin trapping method in phosphate buffer. Addition of Fe3+ ion into the above system led to the detection of both O2− and ·OH spin adducts.
ELECTROLYTIC REDUCTION OF 1-METHYLSULFINYL-1-METYLTHIO-2-ARYLETHENES AT MERCURY AND PLATINUM ELECTRODES IN ACETONITRIL
Authors: Kunugi Akira , Abe Kyo
Published: July 2006

The electrolytic reduction of 1-methylsulfinyl-1-methylthio-2-arylethenes involves a cleavage of one carbon–sulfur bond, resulting in formation of E-1-methylthio-2-arylethenes in good yields, but not Z-isomers, in the presence of excess phenol as a proton donor.
STEREO- AND REGIO-SELECTIVE ALDOL-TYPE REACTIONS OF ALKYLPYRIDINES WITH BENZALDEHYDE
Authors: Hamana Hiroshi , Sugasawa Tsutomu
Published: July 2006

Stereo- and regio-selectivity in the reaction of alkylpyridines with benzaldehyde were studied. Erythro-selectivity could be obtained in the reaction of 2-alkylpyridine with benzaldehyde in the presence of dialkylboryl triflate and triethylamine. Substitution at the 2- or 4-position of 2,4-lutidine could be controlled by the combination of dialkylboryl triflate and an aliphatic tertiary amine. The steric effect had an important role in the reaction of 4-picoline and lepidine.
NEW ENTRY TO THE PREPARATION OF CHIRAL BIS(DICYCLOHEXYLPHOSPHINO)ALKANE DERIVATIVES. USE FOR RHODIUM-CATALYZED HYDROGENATION OF CARBONYL COMPOUNDS
Authors: Yamamoto Keiji , Saeed-Ur-Rehman
Published: July 2006

Conversion has been achieved of two representative chiral diphosphines, (−)-DIOP and (S,S)-Chiraphos, into the corresponding bis(dicyclohexylphosphino)alkane derivatives, the latter being used for chiral ligands of the rhodium(I) catalyst in the homogeneous hydrogenation of prochiral carbonyl compounds.
EFFECT OF METAL DISPERSION ON THE ACTIVITY AND SELECTIVITY OF Rh/SiO2 CATALYST FOR HIGH PRESSURE CO HYDROGENATION
Authors: Arakawa Hironori , Takeuchi Kazuhiko , Matsuzaki Takehiko , Sugi Yoshihiro
Published: July 2006

Metal dispersion has a striking influence on the activity and selectivity of Rh/SiO2 for high pressure CO hydrogenation. Decreasing dispersion, turnover frequency of CO conversion does not change significantly with dispersion up to 0.5 but increases abruptly at dispersion of 0.45. CH3OH is produced selectively at high dispersion. C2-oxygenated compounds are produced favorably for dispersion of 0.25–0.45. CH4 formation increases monotonously with decrease of dispersion.
SYNTHESIS OF AMINOCYCLITOL PART OF 5-DE-O-METHYLSPORARICIN A
Authors: Yasuda Nobuyoshi , Matsuda Keiji , Tsutsumi Hideo , Takaya Takao
Published: July 2006

d,l-(1,2,4/5,6)-1,4,6-tri-O-acetyl-2,5-bis(benzyloxycarbonylamino)-5-N-methyl-1,4,6-cyclohexanetriol was synthesized from d,l-(1,2,3/4,5,6)-1,4-bis(benzyloxycarbonylamino)-2,3-O-isopropylidene-2,3,5,6-cyclohexanetetraol.
CHIRALITY TRANSFER IN THE ESTER ENOLATE CLAISEN REARRANGEMENT OF (R)-1-METHYL-(E)-2-BUTENYL HYDROXYACETATE AND ITS APPLICATION TO THE STEREOCONTROLLED PHEROMONE SYNTHESIS
Authors: Fujisawa Tamotsu , Tajima Kazuhisa , Sato Toshio
Published: July 2006

The ester enolate Claisen rearrangement of (R)-1-methyl-(E)-2-butenyl hydroxyacetate provides complete asymmetric transfer along with 98% erythroselectivity to give (2R,3S)-2-hydroxy-3-methyl-(E)-4-hexenoic acid. Its synthetic utility is demonstrated by the stereocontrolled synthesis of optically active pheromones.
NOVEL CYCLIZATION OF 2-(HYDROXYIMINO)-2-PHENYLETHYL DITHIOCARBOXYLATES
Authors: Ishida Masaru , Nakanishi Hirofumi , Kato Shinzi
Published: July 2006

2-(Hydroxyimino)-2-phenylethyl arenedithiocarboxylates were cyclized to isothiazoles by the treatment with tosyl isocyanate.
LASER FOURIER IMAGING OF CHEMICAL REACTION. OBSERVATION OF THE DIFFUSION PROCESS OF HEAT EMITTED FROM DYE MOLECULES BY STRIPED LASER EXCITATION
Authors: Ishizaka Shozo , Urano Toshiyuki , Tokumaru Katsumi
Published: July 2006

Excitation of Eosin Y in ethanol solution with irradiated stripes of chopped argon ion laser beam gives thermal fringes which diffract helium-neon laser beam; the resulting diffraction fringes correspond to the Fourier transformation of the thermal fringes. By following the growth and decay of the transient diffraction signals the diffusivity of heat evolved by the photoexcitation in the solution was determined.
SPECIFIC RECOGNITION OF NONPOLAR GROUPS IN AQUEOUS MEDIA. LARGER SELECTIVITY DIFFERENCES IN OXIDATION OF ASSOCIATING THIOLS IN AQUEOUS MIXED SOLVENTS THAN IN NONAQUEOUS ONES
Authors: Endo Tadashi , Takei Hiromichi , Guro Kazuo , Yamashita Minoru , Yonenaga Shu , Ito Masato M , Matsushita Kazuhiro
Published: July 2006

Environment dependence of the selectivity in oxidation of a pair of associating thiols was examined in binary solvent mixtures of an alcohol or acetonitrile with water and an organic cosolvent. The discrimination between the two nonpolar groups (n- and i-C5H11 groups, phenyl and p-tolyl groups, or n- and i-C4H9 groups) of one of the thiols was found to occur more specifically in aqueous media than in the corresponding nonaqueous media.
SYNTHESIS OF γ,δ-UNSATURATED KETONES BY THE INTRAMOLECULAR DECARBOXYLATIVE ALLYLATION OF ALLYL β-KETO CARBOXYLATES AND ALKENYL ALLYL CARBONATES CATALYZED BY MOLYBDENUM, NICKEL,AND RHODIUM COMPLEXES
Authors: Tsuji Jiro , Minami Ichiro , Shimizu Isao
Published: July 2006

Allyl β-keto carboxylates and alkenyl allyl carbonates were converted to γ,δ-unsaturated ketones by the intramolecular decarboxylative allylation catalyzed by molybdenum, nickel, and rhodium complexes.
EXISTENCE OF BENZYLATED CARBOHYDRATE MOIETY IN LIGNIN–CARBOHYDRATE COMPLEX FROM PINE WOOD
Authors: Koshijima Tetsuo , Watanabe Takashi , Azuma Jun-ichi
Published: July 2006

Using the reaction of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) which acts on O-methoxybenzyl ether to liberate alcohol quantitatively, a part of sugar moieties contained in conifer lignin–carbohydrate complex (LCC) was confirmed to link to lignin moiety at α-carbon of phenylpropane units through benzyl ether bond.
SIMPLE SYNTHESIS OF GLYCOSYL FLUORIDES
Authors: Hayashi Masahiko , Hashimoto Shun-ichi , Noyori Ryoji
Published: July 2006

Treatment of 1-unprotected or -O-acetylated sugar derivatives with a hydrogen fluoride–pyridine mixture affords the corresponding 1-fluoro derivatives in high yields.
PROTECTION OF 5′-TERMINAL PHOSPHATE OF DEOXYRIBOOLIGONUCLEOTIDES BY USE OF o,o′-DIAMINOBIPHENYL
Authors: Nishizawa Makoto , Kurihara Takashi , Hata Tsujiaki
Published: July 2006

Cyclic phosphorodianilidate derivatives of nucleoside 5′-phosphates were prepared by use of triphenylphosphine and 2,2′-dipyridyl disulfide as condensing agent and used for the synthesis of oligodeoxyribonucleotides. Removal of the diamino group was remarkably accelerated by coaddition of AgOAc and acid anhydrides to the conventional system, iAmONO-pyridine-AcOH.
ITALICENE AND ISOITALICENE, NOVEL SESQUITERPENE HYDROCARBONS FROM HELICHRYSUM OIL
Authors: Leimner Jürgen , Marschall Helga , Meier Norbert , Weyerstahl Peter
Published: July 2006

From Helichrysum oil two new sesquiterpene hydrocarbons, italicene and isoitalicene were isolated. Their structure was confirmed by spectral data, degradation reactions and unambiguous synthesis starting from m-bromoanisole.
IMMOBILIZATION OF AMMONIUM BILAYER MEMBRANES BY COMPLEXATION WITH ANIONIC POLYMERS
Authors: Kunitake Toyoki , Tsuge Akihiko , Nakashima Naotoshi
Published: July 2006

Water-insoluble polyion complexes were prepared by mixing aqueous solutions of ammonium bilayer membranes and anionic polymers. The complexes retained typical bilayer characteristics and gave transparent films by casting.
PHOTOELECTROCHEMICAL STUDY OF CHLOROPHYLL-a-PVA COMPLEX FILM ON SnO2 ELECTRODE
Authors: Inamura Isamu , Ochiai Hideo , Toki Kenzi , Araki Takeo
Published: July 2006

Photoelectrochemical behavior of Chl-a(670) and Chl-a(740)-PVA complex films deposited on SnO2 optically transparent electrode was investigated in an electrolyte solution containing hydroquinone as a reducing agent. For both films, the anodic photocurrent rose from −0.12 V or −0.13 V vs. SCE and reached a maximum at ca. +0.2 V. The spectrum of the photocurrent coincided with the absorption spectrum.
THE CRYSTAL STRUCTURES AND ELECTRICAL RESISTIVITIES OF (BEDT-TTF)3(ClO4)2 AND (BEDT-TTF)2ClO4(C4H8O2)
Authors: Kobayashi Hayao , Kato Reizo , Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Saito Gunzi , Enoki Toshiaki , Inokuchi Hiroo
Published: July 2006

The crystal structures of (BEDT-TTF)2ClO4(C4H8O2) and (BEDT-TTF)3(ClO4)2(BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene) were determined. In both crystals, BEDT-TTF molecules are arranged side-by-side. The former is a semiconductor with the room-temperature resistivity of 1 Ω cm. The 3:2 salt undergoes a sharp metal-insulator transition at 170 K.
SYNTHESIS AND SOME PROPERTIES OF 1,2-DIHYDRO-4,7-DIHYDROXYCYCLOBUTA[b]NAPHTHALENE-3,8-DIONE AND 1,2,5,6-TETRAHYDRO-4,7-DIHYDROXYDICYCLOBUTA[b,g]NAPHTHALENE-3,8-DIONE
Authors: Watabe Takashi , Oda Masaji
Published: July 2006

Title compounds have been first synthesized. The effects of strain due to the cyclobutene annelation are observed in the 13C NMR chemical shifts, tautomeric equilibrium, reduction potentials, and Diels–Alder reactions with dienes; thermolytic Diels-Alder reactions with dienophiles give novel polycyclic hydroxyquinones.
SELECTIVE SYNTHESIS OF Dl-DENDROKETOSE FROM FORMALDEHYDE
Authors: Matsumoto Toshihiko , Yamane Masahiro , Inoue Shohei
Published: July 2006

A one-pot selective formation of a hexulose, dendroketose, was achieved by the addition of an aqueous alkaline solution to the reaction mixture obtained by the condensation reaction of formaldehyde catalyzed by a thiazolium salt.
A CONVENIENT METHOD FOR THE SYNTHESIS OF 4-CHLORO-3-ALKENOIC ACID. A NEW USEFUL SYNTHETIC BLOCK FOR 4-OXOALKANOIC AND 4-OXO-2-ALKENOIC ACIDS
Authors: Kawashima Masatoshi , Fujisawa Tamotsu
Published: July 2006

Easily available material, β-(1-chlorovinyl)-β-propiolactone reacted with organocopper reagents to afford 4-chloro-3-alkenoic acids in high yields. The acids were easily transformed into two kinds of useful carboxylic acids such as 4-oxoalkanoic and 4-oxo-(E)-2-alkenoic acids leading to various natural products.
NEW “AMPHOTERIC ION TYPE” WATER-SOLUBLE PORPHINES AS A SPECTROPHOTOMETRIC REAGENT
Authors: Igarashi Shukuro , Yotsuyanagi Takao
Published: July 2006

Three kinds of new water-soluble porphines with amphoteric groups were synthesized as highly sensitive spectrophotometric reagents for metal ions. Among them, tetrakis(1-pyridinio-2-sulfoethyl)porphine was a promising reagent because it did not show any adsorption on the surface of glassware over the pH range of 2.0–12.4, or any aggregation over its concentration range up to 10−4 mol dm−3 at the pH range of 0.5–13.0.
PREPARATION AND REACTIVITIES OF THE BIS{1,2-BIS(DIMETHYLPHOSPHINO)ETHANE}PEROXOCOBALT(III) COMPLEX
Authors: Ohishi Tomoji , Kashiwabara Kazuo , Fujita Junnosuke
Published: July 2006

The [Co(O2)(dmpe)2]+ (dmpe=(CH3)2PCH2CH2P(CH3)2) complex was prepared and found to react immediately with SO2 to afford [Co(SO4)(dmpe)2]+, and with coned HCl and HClO4 to yield the cis-dichloro and trans-diaqua complexes, respectively.
THE COMPETITION BETWEEN ELECTROCYCLIC REACTION AND [1,5]SIGMATROPIC REACTION IN THE THERMOLYSIS OF 1,1-DISUBSTITUTED BENZOCYCLOBUTENES
Authors: Shishido Kozo , Ito Masahiro , Shimada Shin-ichi , Fukumoto Keiichiro , Kametani Tetsuji
Published: July 2006

Thermolysis of 1-acyl-1-alkylbenzocyclobutenes was found to give predominantly the corresponding isochromenes via Z-conformer of the o-quinodimethane in the transition state.
“MULTI-ARMED CYCLAM” FOR SPECIFIC TRANSPORT OF NH4+ CATION
Authors: Tsukube Hiroshi
Published: July 2006

New macrocyclic polyamine bearing furan oxygen atoms on its side arms offered characteristic cation transport phenomena. It specifically transported NH4+ cation, based on its unique ligand topology, while K+ and other cations were hardly transported.
PHOTO-INDUCED POLYPEPTIDE MEMBRANE POTENTIAL CHANGES BY cis–trans ISOMERISM IN SIDE-CHAIN AZOBENZENE GROUPS
Authors: Takizawa Akira , Sato Morimasa , Kinoshita Takatoshi , Tsujita Yoshiharu
Published: July 2006

Photo-induced membrane potential changes were observed for solid membrane of poly(l-glutamic acid)(PGA) with azobenzene groups in the polymer side chains (azo-modified PGA) . The increase in membrane potential indicates an increase in negative fixed charge concentration of the membrane, i.e., an increase in the degree of dissociation of the l-glutamic acid CO2H side chains in the membrane via the trans to cis isomerization of the azo groups on UV irradiation.
THE REACTION OF 2H-THIIN DERIVATIVES WITH PERACID. RING CONTRACTION AND ALKOXYLATION REACTIONS
Authors: Ohmura Haruo , Motoki Shinichi
Published: July 2006

The cycloaddition reaction of aromatic thioketones (aryl naphthyl thioketones and 2-benzofuryl phenyl thioketone) with 2-chloroacrylonitrile followed by elimination of hydrogen chloride gave some 2H-thiin derivatives. The products reacted with MCPBA and an alcohol to afford ring-contracted product and alkoxylated derivatives.
ONE-POT SYNTHESIS OF α-CHLORONITRILES FROM ARYLCARBONYL COMPOUNDS
Authors: Kiyooka Syun-ichi , Fujiyama Ryoji , Kawaguchi Katsuhiko
Published: July 2006

α-Chloronitriles are prepared by the reaction of arylcarbonyl compounds and trimethylsilyl cyanide with a stoichiometric amount of titanium tetrachloride in good yields.
MAGNETIC FIELD EFFECT ON THE HYDROGEN ABSTRACTION REACTIONS OF AROMATIC CARBONYLS IN SDS MICELLAR SOLUTION
Authors: Tanimoto Yoshifumi , Takashima Masanobu , Itoh Michiya
Published: July 2006

The magnetic field effect on the photoinduced hydrogen abstraction reactions of twelve aromatic carbonyls from xanthene and 9,10-dihydroanthracene has been studied in sodium dodecyl sulfate (SDS) micellar solution by laser flash photolysis.
THE PREPARATION OF MACROCYCLIC DI- OR TETRAESTER/ETHER COMPOUNDS FROM GLYCOLS WITH DIACID CHLORIDES BY THE USE OF DIBUTYLTIN OXIDE
Authors: Ninagawa Akira , Maeda Takeshi , Matsuda Haruo
Published: July 2006

Several macrocyclic di- or tetraester/ether compounds were readily prepared by reacting various oligoethylene glycols with aliphatic and aromatic diacid chlorides, and hetero atoms-containing diethylene glycols with adipoyl chloride by the use of dibutyltin oxide in good yields.
SELECTIVE MONOBROMINATION OF ANILINE DERIVATIVES BY USE OF BROMINE ADSORBED ON ZEOLITE 5A
Authors: Onaka Makoto , Izumi Yusuke
Published: July 2006

Aniline is selectively brominated by use of molecular bromine adsorbed on zeolite 5A in carbon tetrachloride to give monobromoanilines. Coexistence of organic bases such as pyridine and 2,6-lutidine increases the yield and selectivity of 4-bromoaniline. o-, m-, and p-Toluidines are also monobrominated selectively according to the present procedure.
ASYMMETRIC SYNTHESIS OF CHIRAL SULFOXIDES VIA MICROBIAL OXIDATION OF SULFIDES
Authors: Ohta Hiromichi , Okamoto Yasushi , Tsuchihashi Gen-ichi
Published: July 2006

Incubation of alkyl aryl and allyl aryl sulfides with growing cells of Corynebaoterium equi IFO 3730 gave the corresponding optically active sulfoxides of high enantiomeric excess.
A CONVENIENT METHOD FOR THE MILD REDUCTIVE DEBROMINATION OF α-BROMO KETONES AND OF vic-DIBROMOALKANES WITH STANNOUS CHLORIDE/DIISOBUTYLALUMINUM HYDRIDE
Authors: Oriyama Takeshi , Mukaiyama Teruaki
Published: July 2006

A new reducing agent prepared by the treatment of stannous chloride with diisobutylaluminum hydride was shown to be effective for debrominations of α-bromo ketones to ketones and of vic-dibromoalkanes to the corresponding alkenes under mild conditions.
ASYMMETRIC REDUCTION OF PROCHIRAL KETONES WITH A CHIRAL REDUCING AGENT PREPARED FROM STANNOUS CHLORIDE, CHIRAL DIAMINE AS A LIGAND, AND DIISOBUTYLALUMINUM HYDRIDE
Authors: Oriyama Takeshi , Mukaiyama Teruaki
Published: July 2006

A new chiral reducing agent, prepared by treatment of a mixture of stannous chloride and a chiral diamine derived from (S)-proline with diisobutylaluminum hydride, is effective for asymmetric reduction of prochiral ketones.
REGIO- AND STEREOSPECIFIC SYNTHESIS OF TRIPLY UNSATURATED HYDROCARBONS FROM INTERNAL ENYNYLDIALKYLBORANES
Authors: Arase Akira , Hoshi Masayuki , Masuda Yuzuru
Published: July 2006

Internal enynyldialkylboranes give regio- and stereospecifically designed conjugated enynes, bearing an allyl or 1-alkynyl group on the internal alkenyl carbon atom, by a coupling reaction with allyl bromide or 1-bromo-1-alkynes.
KINETIC STUDIES ON β-ARYL MIGRATION ACROSS THE DOUBLE BOND IN VINYL CATIONS
Authors: Kobayashi Shinjiro , Kitamura Tsugio , Taniguchi Hiroshi , Schnabel Wolfram
Published: July 2006

The rates of β-aryl migration in vinyl cations were determined by laser flash photolysis of the corresponding vinyl bromides in acetonitrile. β-Anisyl migration occurred very rapidly (k≥108 s−1). β-Phenyl migration in Ph(An)C=\overset+C-Ph→An-\overset+C=CPh2 was relatively slow process (k=7.4 × 106 s−1 at 273 K).
INTERACTION OF CHLORIDE IONS WITH NONIONIC SURFACTANT AS MEDIATED BY INORGANIC CATIONS INCORPORATED IN SURFACTANT MICELLES
Authors: Nakanishi Toru , Seimiya Tsutomu , Sugawara Tadashi , Iwamura Hiizu
Published: July 2006

The line width ΔνCl of 35Cl NMR was measured for n-C12H25O(CH2CH2O)pH (p = 5, 6, 7, 8) / water / XCl (X = H, Na, Li) systems. The 17O NMR line width ΔνO due to water was also examined. The broadening of ΔνCl by introduction of the nonionic surfactant to aqueous XCl solutions was explained by the enhanced interaction of the chloride ions with surfactant micelles to which inorganic cations were incorporated.
SELECTIVE FORMOSE REACTION INITIATED BY PHOTO- AND γ-IRRADIATION
Authors: Irie Setsuko
Published: July 2006

A selective formose synthesis was achieved by photo- and γ-irradiation of formaldehyde in the presence of base. Photoirradiation of aqueous formaldehyde solution gave pentaerythritol as a single product, while γ-irradiation resulted in the formation of glycolaldehyde as the main product. These results suggest that the formose reaction under photo- and γ-irradiation is considerably different from the thermal formose reaction.
A REVISED STRUCTURE FOR DITERPENOID MAGYDARDIENDIOL
Authors: Teresa J de Pascual , Grande C , Moran J R , Grande M
Published: July 2006

The revised structure and the stereochemistry shown are proposed for magydardiendiol on the basis of chemical and spectral data, mainly 200 MHz 1H-NMR and CD spectra. The proposed structure is: (1S,2R,5S,6R) 2-hydroxymethyl-1,5-dimethy1-6-(3-methyl-2-buteny1)-5-(4-methyl-3-pentyl)cyclohexanol.
DIENE-TRANSMISSIVE DIELS–ALDER REACTION OF A NEW CROSS-CONJUGATED TRIENE: SELECTIVE FORMATION OF MONO- AND BIS-CYCLOADDUCT
Authors: Tsuge Otohiko , Kanemasa Shuji , Sakoh Hirohiko , Wada Eiji
Published: July 2006

A new activated cross-conjugated triene, 3-(methoxymethylene)-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, was prepared. Its reactions with acetylenic dienophiles resulted in the exclusive formation of mono-cycloadducts, while in the reactions with cyclic olefinic dienophiles such as maleimides and maleic anhydride the mono- and bis-adducts were obtained depending upon the amounts of dienophiles.
NEW C–C BOND FORMATION WITH PYRIDINIUM METHYLIDE: HYDROMETHYLENATION OF OLEFIN
Authors: Tsuge Otohiko , Kanemasa Shuji , Kuraoka Satoru , Takenaka Shigeori
Published: July 2006

New C–C bond formation with pyridinium methylide is presented: Pyridinium methylide reacts with electron-deficient olefins providing the next higher homologs of olefins, in which the double bond of starting olefin is saturated and, instead, a C=C double bond is newly formed. This reaction mode has been never reported before in the study of nitrogen ylide and is to be referred to as hydromethylenation of olefin. In the presence of base, 1,2-double bond migration occurs leading to the methylated derivatives of starting olefins.
PHOTOCHEMICAL GEOMETRICAL ISOMERIZATION OF A C=C-C=N SYSTEM. BEHAVIOR OF THE FOUR STEREOISOMERS OF 1-METHOXYIMINO-3-PHENYL-2-PROPENE
Authors: Okami Akiko , Arai Tatsuo , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

Irradiation of the four isomers, trans-anti, trans-syn, cis-anti, and cis-syn, of 1-methoxyimino-3-phenyl-2-propene, a conjugated imine, resulted in cis-trans, syn-anti, and concurrent cis-trans and syn-anti isomerization. The photostationary isomer ratio and the quantum yields of the isomerization from each isomer were determined to elucidate the mechanism of the isomerization.
SYNERGETIC ELECTROCATALYST FOR EFFICIENT PHOTOELECTROCHEMICAL GENERATION OF HYDROGEN AT p-InP
Authors: Uosaki Kohei , Kita Hideaki
Published: July 2006

The efficient photoelectrochemical generation of hydrogen was achieved at p-InP modified with Co–Mo synergetic catalysts. The highest efficiency (8%) was achieved by the galvanostatic cathodic treatment (≈0.5 mA) for 150 s in a solution containing 1 M NaOH, 102M Co(en)3Cl3 and 10−4M Na2MoO4 followed by etching in coned HCl for 5–30 s.
ISOLATION AND CHARACTERIZATION OF A STABLE DITHIOXOPHOSPHORANE
Authors: Yoshifuji Masaaki , Toyota Kozo , Ando Kaori , Inamoto Naoki
Published: July 2006

A sterically protected dithioxophosphorane, 2,4,6-tri-t-butylphenyldithioxophosphorane, has been isolated and characterized for the first time as a stable compound.
ELECTRIC AND MAGNETIC PROPERTIES OF TETRABENZO[de,hi,op,st]PENTACENE–ALKALI METAL COMPLEXES
Authors: Imaeda Kenichi , Enoki Toshiaki , Inokuchi Hiroo , Aoki Junji , Takekawa Minoru , Iwashima Satoshi
Published: July 2006

The electric and magnetic properties of the charge transfer complexes of tetrabenzo[de,hi,op,st]pentacene (TBPA) with various Cs compositions have been investigated. The nonplanarity of a TBPA nanocyclic aromatic molecule causes the restriction against complex formation in contrast with other nanocyclic ones, TBPA-Cs complexes were good conductors, which was consistent with their characteristics of a partial charge transfer.
A FACILE PREPARATION OF 2-ARYLPROPIONALDEHYDE FROM 1-ARYL-1-PROPENE
Authors: Kikuchi Haruhiko , Kogure Katsura , Toyoda Masashi
Published: July 2006

1-Aryl-1-propenes were converted into the corresponding 2-arylpropionaldehydes in high yields by treatment with iodine and silver(I)oxide in aqueous dioxane at room temperature.
TOTAL SYNTHESIS AND ABSOLUTE CONFIGURATION OF (+)-(1,2,3/4,5)-2,3,4,5-TETRAHYDROXY-1-CYCLOHEXANEMETHANOL
Authors: Ogawa Seiichiro , Iwasawa Yoshikazu , Suami Tetsuo
Published: July 2006

The title branched-chain cyclitol has been synthesized from chiral 7 endo-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid, the absolute configuration of which was established on the basis of X-ray analysis of crystalline bromolactone derived from it. From this result the C-1 configuration of the cyclitol is determined to be R.
REGIOSPECIFIC RING CLEAVAGE OF α,β-EPOXYSILANES TO FORM TRANSITION METAL ENOLATE INTERMEDIATES
Authors: Hirao Toshikazu , Fujihara Yoshimi , Tsuno Shingo , Ohshiro Yoshiki , Agawa Toshio
Published: July 2006

Molybdenum(II) acetate dimer or titanium(IV) i-propoxide induced regiospecific ring cleavage of α,β-epoxysilanes to form the enolate intermediates, which reacted with aldehydes to give the corresponding α,β-unsaturated carbonyl compounds.
A NEW METHOD FOR COLORING ANODIC OXIDE FILMS ON ALUMINUM
Authors: Itô Seisirô , Noguchi Hayao , Yoshimura Chozo , Kuwahara Tosihide
Published: July 2006

A new hydrothermal treatment of anodic oxide films on aluminum was proposed by the use of water containing cobalt(II) oxide at 280 °C in an autoclave. A reaction of the alumina on the film with cobalt(II) oxide resulted in the formation of cobalt(II) aluminate. The color of the film was a vivid bright blue.
DETECTION OF HYDROGEN IN AMBIENT AIR USING A COATED PIEZOELECTRIC CRYSTAL
Authors: Hosoya Toshifumi , Abe Satsuki , Yoshida Tadao
Published: July 2006

A gas sensor using a piezoelectric quartz crystal coated with thin Pd layers was found to have a high sensitivity and selectivity to hydrogen gas. At a room temperature, the frequency shift showed a linear relation with the partial pressure of hydrogen and response times were about 2 min.
TRANSIENT BEHAVIOR OF THE ELECTROMOTIVE FORCE OF AN OXYGEN SENSOR INDUCED BY THE TEMPERATURE CHANGE
Authors: Taimatsu Hitoshi , Kaneko Hiroyuki , Nakatani Fumitada
Published: July 2006

When the operating temperature of an oxygen sensor with a zirconia-based electrolyte was changed rapidly during the measurement of the oxygen partial pressure in argon, an abnormal electromotive force was transiently generated. This phenomenon is attributed to the transient variation of oxygen concentrations at the electrolyte/electrode interfaces.
PHOTOLYSIS AND THERMOLYSIS OF 1,2,3-TRISILACYCLOPENTENE. REGIOSPECIFIC AND NON-REGIOSPECIFIC SILYLENE EXTRUSION
Authors: Nakadaira Yasuhiro , Sato Ryuji , Kida Nobutsugu , Sakurai Hideki
Published: July 2006

1,2,3-Trisilacyclopent-4-ene generates silylene to give 1,2-disilacyclobut-3-ene on both photolysis and thermolysis. The silylene arises from either the central or the terminal silicon atom of the ring depending on the nature of substituents on the central silicon atom on photolysis, but the central silicon is ejected as silylene regiospecifically on thermolysis.