bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOCHEMICAL REDUCTION AND AIR OXIDATION OF cis-DIAMMINEPLATINUM α-PYRROLIDONE TAN IN AQUEOUS SOLUTION
Authors: Matsumoto Kazuko
Published: July 2006

cis-Diammineplatinum α-pyrrolidone tan cation, [Pt4(NH3)8(C4H6NO)4]6+, is proved to be reduced to dark blue [Pt4(NH3)8(C4H6NO)4]5+ and yellow [Pt4(NH3)8(C4H6NO)4]4+ by water and be oxidized by air to a yellow species of Pt(III). The reduction reaction is accelerated by visible light irradiation. Both the reduction and oxidation reactions are completely reversible and the addition of Ce4+ or Fe2+ quantitatively restores the original species, respectively.
CRYSTALLIZATION OF POLY(ETHYLENE GLYCOL) DI-9-ANTHROATE ADSORBED ON POLY(METHACRYLIC ACID) MEMBRANE IN WATER
Authors: Osada Yoshihito , Koike Masayoshi
Published: July 2006

A poly(ethylene glycol) di-9-anthroate made adsorption on the poly(methacrylic acid) membrane through polymer membrane complexation in water and crystallized spontaneously to give a single-crystal with unique morphological texture on the surface of the membrane.
SYNTHESIS OF RIBOSTAMYCIN. AN APPLICATION OF A CHEMICAL CONVERSION METHOD FROM CARBOHYDRATE TO AMINOCYCLITOL
Authors: Yoshikawa Masayuki , Ikeda Yoshiharu , Takenaka Kohei , Torihara Masahiro , Kitagawa Isao
Published: July 2006

An aminoglycoside antibiotic ribostamycin was synthesized from d-glucosamine and ribose via an amino-trisaccharide intermediate, which was prepared through successive selective glycosidations on the 1,6-anhydro-d-glucosamine moiety.
ACTIVATED METALLIC NICKEL IN THE PREPARATION OF SYMMETRICAL 1,3-DIARYLPROPAN-2-ONES FROM BENZYLIC HALIDES AND ALKYL OXALYL CHLORIDES
Authors: Inaba Shin-ichi , Rieke Reuben D
Published: July 2006

Oxidative addition of benzylic halides to nickel in the metallic state followed by insertion of carbon monoxide generated from alkyl oxalyl chlorides proceeded smoothly to give symmetrical 1,3-diarylpropan-2-ones in moderate yields.
ASYMMETRIC REDUCTION OF ALKYL ARYL KETONES WITH LITHIUM BOROHYDRIDE USING N-BENZOYLCYSTEINE AS CHIRAL LIGAND
Authors: Soai Kenso , Yamanoi Takashi , Oyamada Hidekazu
Published: July 2006

N-Benzoylcysteine, a chiral ligand possessing sulfur donor atom, was found to be highly effective in enantioselective reduction of alkyl aryl ketones with lithium borohydride (up to 92–93%e.e.).
1,4-CHIRALITY TRANSFER VIA THE [2,3]-WITTIG REARRANGEMENT OF CHIRAL ALLYLIC PROPARGYL ETHER SYSTEM. A NEW, PRACTICAL ENTRY TO CHIRAL PROPARGYLIC ALCOHOLS
Authors: Sayo Noboru , Shirai Fumiyuki , Nakai Takeshi
Published: July 2006

The [2,3]-Wittig rearrangement of enantiomerically-enriched α-methylallyl propargyl ethers provides a high degree (ca. 90%) of 1,4-chirality transfer, together with 95–98% of (E)-selectivity. The observed sense of 1,4-chirality transfer is discussed on mechanistic grounds.
CHEMO- AND REGIOSELECTIVE REDUCTION OF α,β-EPOXY KETONES TO β-HYDROXY KETONES BY SODIUM HYDROGENTELLURIDE
Authors: Osuka Atsuhiro , Taka-Oka Koji , Suzuki Hitomi
Published: July 2006

α,β-Epoxy ketones were chemo- and regioselectively reduced to β-hydroxy ketones by sodium hydrogenteiiuride in good yields.
N-(TRIMETHYLSILYLMETHYL) PYRIDINIUM TRIFLUOROMETHANESULFONATES AS FACILE PRECURSORS FOR NONSTABIL1ZED PYRID1NIUM METHYLIDES
Authors: Tsuge Otohiko , Kanemasa Shujf , Kuraoka Satoru , Takenaka Shigeorf
Published: July 2006

As facile precursors for nonstabilized pyridinium methylides N-(trimethylsilylmethyl)pyridinium triflates were synthesized. Cesium fluoride induced desilylation of the precursors liberated the nonstabilized pyridinium methylides which were trapped as the cycloadducts to dimethyl acetylenedicarboxylate.
ON THE STERIC COURSE OF THE ADDITION OF CROTYL METALS ONTO (2S,3S) 2,3-ISOPROPYLIDENEDIOXY BUTYRALDEHYDE AND (3S,4S) 3,4-ISOPROPYLIDENEDIOXYPENTANONE. SYNTHESIS OF 2,6-DIDEOXY-2C METHYL BRANCHED SUGARS OF THE l-SERIES
Authors: Fronza Giovanni , Fuganti Claudio , Grasselli Piero , Pedrocchi-Fantoni Giuseppe , Zirotti Carlo
Published: July 2006

The mode of addition and the synthetic applications of the products ined in the reaction of BrMgCH2CH=CHCH3 and BrCH2CH=CHCH3/CrCl2 with α,β-dialkoxy carbonyl compounds are reported.
ORGANIC SYNTHESIS USING HALOBORATION REACTION. IV. IODOBORAXION REACTION OF TERMINAL ALLENES
Authors: Hara Shoji , Takinami Satoru , Hyuga Satoshi , Suzuki Akira
Published: July 2006

Terminal allenes react smoothly with B-iodo-9-borabicyclo[3.3.1]nonane (B-iodo-9-BBN), and the subsequent protonolysis with acetic acid gives the corresponding 2-iodoalkenes.
AN ELECTROCHEMICAL SYNTHESIS OF 2-HYDROXY-2-(p-ISOBUTYLPHENYL)PROPIONIC ACID
Authors: Ikeda Yoshikazu , Manda Eiichiro
Published: July 2006

The title compound, which is a good precursor of 2-(p-isobutylphenyl)propionic acid, was synthesized in 85% yield by the electrochemical reduction of p-isobutylacetophenone in DMF containing 0.5 M BU4NI on Hg pool cathode by passing 2.0 F/mol electricity with a constant current density of 48.2 mA/cm2 in the presence of CO2.
IDENTIFICATION OF VARIOUS INTERMEDIATES IN THE REACTION OF CUPRIC IONS WITH CYANIDE IONS BY ESR SPECTROSCOPY. APPLICATION OF A NEW RAPID-FREEZING APPARATUS
Authors: Yokoi Hiroshi , Hanaki Akira
Published: July 2006

Various intermediates of mononuclear copper(II) cyanide complexes in the reaction of cupric ions with cyanide ions have been first identified by ESR spectroscopy after the use of a newly-constructed rapid-freezing apparatus. The formation of these intermediates has been found to depend primarily on the ratio [CN−]/[Cu2+] and pH values. Possible structures of these intermediate complexes have been estimated by experiments with isotopes and by the application of the “rule of average environment” to their ESR parameters determined.
n-TYPE SEMICONDUCTING BEHAVIOR OF 5,10,15,20-TETRA(3-PYRIDYL)PORPHYRIN
Authors: Yamashita Kazuo , Matsumura Yuhei , Harima Yutaka , Miura Shozo , Suzuki Hitomi
Published: July 2006

The photovoltaic effects observed for the indium-tin oxide (ITO)/5,10,15,20-tetra(3-pyridyl)porphyrin (TPyP)/Al cell are consistent with the existence of a Schottky junction at the interface between ITO and TPyP, which acts as an n-type semiconductor. The effects of O2 and H2 on the short-circuit photocurrents and the presence of a blocking contact at the TPyP/p-type porphyrin junction are explained in terms of the n-type semiconducting behavior of TPyP.
TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE (TRIMETHYLSILYL TRIFLATE) AS AN EXCELLENT GLYCOSIDATION REAGENT FOR ANTHRACYCLINE SYNTHESIS. SIMPLE AND EFFICIENT SYNTHESIS OF OPTICALLY PURE 4-DEMETHOXYDAUNORUBICIN
Authors: Kimura Yoshikazu , Suzuki Michiyo , Matsumoto Teruyo , Abe Rumiko , Terashima Shiro
Published: July 2006

The title reagent was found to effect the glycosidation of (+)-4-demethoxyanthracyclinones with N-trifluoroacetyl-1,4-di-O-p-nitrobenzoyl-l-daunosamine, giving the ot-glycosides in 99% yields. Sequential deprotections of the glycoside readily afforded optically pure (+)-4-demethoxydaunorubicin.
CROSSOVER OF THE LOW TEMPERATURE HEAT CAPACITIES OF BIPHENYL AND p-TERPHENYL
Authors: Saito Kazuya , Atake Tooru , Chihara Hideaki
Published: July 2006

Heat capacities of biphenyl, p-terphenyl, and their deuterated analogues were measured between 3 and 300 K. As the temperature decreases, the heat capacity of biphenyl decreases less steeply than that of p-terphenyl, and they cross each other at 12 K. A simple model calculation of lattice vibration shows that the crossover is due to the greater twisting flexibility of phenyl rings in biphenyl.
MARKED DEPENDENCE OF THE SELECTIVITY IN OXIDATION OF A PAIR OF ASSOCIATING THIOLS ON THE STRUCTURE OF COEXISTING THEIR DECEPTOR
Authors: Endo Tadashi , Kaneko Yuji , Mitsuhashi Masatoshi , Endo Masayuki , Takeda Yukiko , Ito Masato M , Nikki Kunio , Nakagawa Naoya , Matsushita Kazuhiro
Published: July 2006

The selectivity in oxidation of a pair of associating thiols with oxygen, on addition of a deceptor structurally related to the thiol, changed remarkably with the structure of the substituent of the deceptor.
SYNTHESIS OF Fe–Mg MULTILAYERED FILMS WITH ARTIFICIAL SUPERSTRUCTURES
Authors: Shinjo Teruya , Kawaguchi Kenji , Yamamoto Ryoichi , Hosoito Nobuyoshi , Takada Toshio
Published: July 2006

By a vacuum deposition method, multilayered films with artificial superstructure have been prepared from mutually insoluble elements, Fe and Mg. X-Ray diffraction confirmed the establishment of very short artificial periods, e.g. Fe(0.8 nm)–Mg(2.4 nm). The multilayer deposition is a very promising technique to fabricate new materials.
CRYSTAL STRUCTURE OF γ-CYCLODEXTRIN AT ROOM TEMPERATURE
Authors: Harata Kazuaki
Published: July 2006

The crystal structure of γ-cyclodextrin 13.3 hydrate was determined by the X-ray method on the basis of the data measured at room temperature. The γ-cyclodextrin molecule is in a round shape, and is slightly distorted from the regular octagonal structure. The γ-cyclodextrin cavity includes 5.3 water molecules which occupy the 13 sites.
THE TOTAL SYNTHESIS OF (±)-MEGAPHONE, A CYTOTOXIC NEOLIGNAN
Authors: Matsumoto Takashi , Imai Sachihiko , Usui Shuji , Suetsugu Akira , Kawatsu Shunzi , Yamaguchi Tadashi
Published: July 2006

The racemic megaphone, a cytotoxic neolignan, has been synthesized from 3,4,5-trimethoxybenzaldehyde via an intermediate, 2-methoxycarbonyl-3-methyl-4-(3,4,5-trimethoxyphenyl)-γ-butyrolactone.
REDUCTION OF AROMATIC NITRO COMPOUNDS TO AMINES BY BENZENETELLUROL
Authors: Ohira Noriyuki , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: July 2006

Benzenetellurol was conveniently generated by methanolysis of phenyl trimethylsilyl telluride or reduction of diphenyl ditelluride with phosphinic acid or sodium borohydride, and smoothly reduced aromatic nitro compounds to the corresponding amines.
ENE-TYPE CHLORINATION OF OLEFINS WITH DICHLORINE MONOXIDE
Authors: Torii Sigeru , Tanaka Hideo , Tada Nobuhito , Nagao Sigemitsu , Sasaoka Michio
Published: July 2006

New ene-type chlorination of olefins with dichlorine monoxide (Cl2O) and its application to the synthesis of chloroazetidinones, key intermediates of penicillin-cephalosporin conversion, are described.
CHEMOSELECTIVE REDUCTIVE CLEAVAGE OF KETALS AND ACETALS
Authors: Borders R J , Bryson T A
Published: July 2006

Utilization of complexed monochloroborane as a reducing agent for ketals and acetals is reported.
INSERTION OF OXYGEN ATOM INTO FUSED CYCLOBUTANE RINGS VIA AN ALKOXYL RADICAL REARRANGEMENT
Authors: Suginome Hiroshi , Liu Chi Fu , Furusaki Akio
Published: July 2006

A new heteroatom insertion into cyclobutane rings via β-scission of alkoxyl radicals generated from photocycloadducts between 4-hydroxycoumarin and cycloalkenes is described.
INFRARED-INDUCED CONFORMATIONAL ISOMERIZATION OF 2-CHLOROETHYLAMINE IN AN ARGON MATRIX
Authors: Nakata Munetaka , Tasumi Mitsuo
Published: July 2006

The infrared spectrum of 2-chloroethylamine has been studied in an argon matrix. It has been found that the gauche to trans isomerization around the C–C bond occurs in the matrix by infrared irradiation and the spectrum of the resultant trans form changes by elevating the matrix temperature from 20 to 28 K.
ASYMMETRIC HYDROGENATION OF GERANIOL AND NEROL CATALYZED BY BINAP–RHODIUM(I) COMPLEXES
Authors: Inoue Shin-ichi , Osada Masato , Koyano Kinko , Takaya Hidemasa , Noyori Ryoji
Published: July 2006

A novel direct synthesis of optically active citronellol has been investigated by asymmetric hydrogenation of geraniol and nerol catalyzed by various BINAP–Rh(I) complexes.
A FACILE SYNTHESIS OF α,β-DIHYDROXYKETONES VIA TIN(IV) ENEDIOLATES BY UTILIZING THE REDUCING POWER OF BIS (2-PYRIDINETHIOLATO)TIN(II)
Authors: Ichikawa Junji , Mukaiyama Teruaki
Published: July 2006

Bis(2-pyridinethiolato)tin(II), a stable stannylene, effects oxidative addition to α-dicarbonyl compounds to generate tin(IV) enediolates, which in turn react with aldehydes to give α,β-dihydroxyketones in good yields with moderate diastereoselectivities.
STEREOSELECTIVE PREPARATION OF ΔLLLΔLLL- AND ΛLLLΛLLL- BIS{TRIS(l-CYSTEINATO-N,S)COBALTATE(III)-μ-S,μ-S′,μ-S″}COBALTATE(III)
Authors: Konno Takumi , Aizawa Sen-ichi , Okamoto Ken-ichi , Hidaka Jinsai
Published: July 2006

The title complexes, ΔLLLΔLLL- and ΛLLLΛLLL-[CoIII{CoIII(l-cys-N,S)3}2]3− (L-cys = L-cysteinate), were stereoselectively prepared by the reaction of fac(S)-[Co(l-cys-N,S)3]3− with [CoCl(NH3)5]2+ and Co2+, respectively. The ΔLLLΔLLL and ΛLLLΛLLL isomers were characterized from their absorption, CD, and 13C NMR spectra.
ISOLATION AND SOME PROPERTIES OF A NOVEL VIOLET COPPER PROTEIN FROM A DENITRIFYING BACTERIUM, ALCALIGENES SP.
Authors: Matsubara Teruo , Sano Mitsuru
Published: July 2006

A novel violet copper protein which is a candidate for N2O-reductase, was purified from a denitrifying bacterium, Alcaligenes sp. NCIB 11015. Molecular weight is 120000. Copper content is 0.261%. The absorption, CD, EPR, and EXAFS studies have been carried out for this protein.
HIGHLY STEREOSELECTIVE SYNTHESIS OF α-RIBONUCLEOTIDES VIA A CYCLIC PHOSPHATE
Authors: Mukaiyama Teruaki , Hayashi Yujiro , Hashimoto Yukihiko
Published: July 2006

Several α-ribonucleotides are conveniently synthesized from the cyclic phosphate derivatives of ribose and nucleoside bases in highly stereoselective manner.
CYCLOADDITION OF DIAZOMETHANE TO BUTADIENYLPHOSPHONATES. A NEW APPROACH TO FUNCTIONALIZED PENTADIENYLPHOSPHONATES AND PYRAZOLES
Authors: Minami Toru , Tokumasu Shigehumi , Mimasu Rikako , Hirao Ichiro
Published: July 2006

The cycloaddition reaction of diazomethane with diethyl 1,3-butadienylphosphonates containing electronegative substituents on the α-carbon atom gave diethyl (4-alkenyl-Δ1-pyrazolin-3-yl)phosphonates in high yields. Thermolysis and the base-catalyzed reaction of the pyrazolinylphosphonates produced functionalized 2,4-pentadienylphosphonates and pyrazoles, respectively, in good yields.
A NOVEL PARTIAL SYNTHESIS OF (−)-WARBURGANAL
Authors: Razmilic Iván , Sierra Jorge , Lopez José , Cortes Manuel
Published: July 2006

A short synthesis of (−)-Warburganal, from (+)-confertifoline through the α-epoxide is described.
THE CHLORO-BRIDGED ONE-DIMENSIONAL NICKEL(II)–NICKEL(IV) MIXED-VALENCE COMPLEX OBTAINED FROM DISPROPORTIONATION REACTION OF THE NICKEL (III) COMPLEX IN (CH3OCH3) (HBF4)
Authors: Yamashita Masahiro , Murase Ichiro , Ikemoto Isao , Ito Tasuku
Published: July 2006

The chloro-bridged one-dimensional NiII–[NiIV mixed-valence complex with 3, 7-diazanonane-1,9-diamine (L),[NiIIL][NiIVCl2] (BF4)4, was prepared by the disproportionation reaction of the NiIII complex, [NiIIICl2L]Cl, using (CH3OCH3)(HBF4) as a solvent and reactant. The authenticity was evidenced by the X-ray photoelectron spectra, electronic spectrum, and electrical conductivity.
LOCAL ORDER IN THE DISTRIBUTION OF Si AND Al IN TECTOALUMINOSILICATES
Authors: Sato Mitsuo
Published: July 2006

Local order of Si,Al distribution in tectosilicates is examined under the restriction of both Loewenstein and Dempsey rules. The distribution of various cluster types permissible for a given Si/Al ratio is predicted by the application of the simplex method of linear programming. There is a good agreement between the predicted and observed values.
HIGHLY LITHIUM-SELECTIVE CROWN ETHER DYES FOR EXTRACTION PHOTOMETRY
Authors: Kimura Keiichi , Tanaka Mutsuo , Kitazawa Sadaya , Shono Toshiyuki
Published: July 2006

Lipophilic 14-crown-4 derivatives bearing a chromogen such as nitrophenol and azophenol residues prove to be excellent extraction-photometric reagents for lithium ion. The lithium selectivities are extremely high, the extraction equilibrium constants for lithium being increased about two orders of magnitude over those for sodium.
TROPONES INCORPORATED INTO 7-OXANORBORNADIENE SKELETON. SYNTHESIS AND ACID-CATALYZED REARRANGEMENT TO 1-HYDROXY-7H-BENZOCYCLOHEPTENES
Authors: Nakazawa Tomoo , Nishikawa Fumiko , Ashizawa Mariko , Jinguji Mamoru , Yamochi Hideki , Murata Ichiro
Published: July 2006

Tropones incorporated into 7-oxanorbornadiene skeleton, 1,4-dihydro-1,4-epoxy-7H-benzocyclohepten-7-ones have been synthesized by the cycloaddition reaction of 4,5-dehydrotropone with furans and their intramolecular π–π interactions and acid-catalyzed rearrangement to 1-hydroxy-7H-benzocyclohepten-7-ones have been studied.
ADSORPTION OF METHYLPHOSPHONIC ACID ON ALUMINA SURFACE STUDIED BY INELASTIC ELECTRON TUNNELING SPECTROSCOPY
Authors: Higo Morihide , Owaki Yasuhiro , Kamata Satuo
Published: July 2006

The vibrational spectrum of methylphosphonic acid adsorbed onto alumina surface was obtained by inelastic electron tunneling spectroscopy. An analysis of the spectrum showed that the methylphosphonic acid is adsorbed as the dibasic phosphonate ion onto the alumina surface.
SIMULTANEOUS DETERMINATION OF GROUP 5A ELEMENTS IN AQUEOUS SOLUTION BY PHOSPHORUS-31 NUCLEAR MAGNETIC RESONANCE SPECTROMETRY
Authors: Fukumoto Takao , Iyoda Jun , Murata Katsuo , Ikeda Shigero
Published: July 2006

Group 5A elements, such as V(V), Nb(V), and Ta(V), react with a molybdophosphate to form ternary heteropoly molybdates quantitatively in the acidic solution. 31P NMR spectra of the compound for each ion exhibit its specific chemical shift and relative peak area in proportion to the concentration of the corresponding complexes. This reaction endues the simultaneous determination of group 5A elements without any separation procedure.
PLASMA-ENHANCED CHEMICAL VAPOR DEPOSITION OF TITANIUM SULFIDES
Authors: Shimanouchi Rie , Yamamoto Takanori , Kikkawa Shinichi , Koizumi Mitsue
Published: July 2006

Reaction between TiCl4 and H2S was performed to deposite titanium sulfide in low-pressure glow discharge. Fine powder of titanium sulfide with submicron diameter was obtained covering the deposited film on the substrate. It had a composition around Ti1.2S2. The phases in the product was investigated in relations to applied rf power and substrate temperature.
NOVEL SYNTHESES OF PHENOSELENAZINEQUINONE INFRARED DYES
Authors: Kim Sung Hoon , Matsuoka Masaru , Kitao Teijiro
Published: July 2006

New series of phenoselenazinequinone infrared dyes for optical recording medium have been synthesized by the ring-closure reaction between 2,3-dihalogenoquinones and zinc 2-aminobenzeneselenate. These dyes absorbed near infrared light at 700–830 nm.
REGIOSELECTIVITY IN THE LITHIATION OF URIDINE. EFFECT OF THE SUGAR PROTECTING GROUPS
Authors: Hayakawa Hiroyuki , Tanaka Hiromichi , Maruyama Yuko , Miyasaka Tadashi
Published: July 2006

Efficiency and regioselectivity in the lithiation of uridine derivatives with lithium dialkylamides are dramatically affected by the protecting groups in their sugar moiety, results suggesting that the metallation proceeds through their syn-conformers.
A NOVEL ELECTROCHEMICAL SOLVENT PARAMETER AND ITS APPLICATIONS TO MICELLAR SYSTEMS
Authors: Fujihira Masamichi , Hoshino Katsuyoshi , Saji Tetsuo , Aoyagui Shigeru
Published: July 2006

The peak-to-peak potential of cyclic voltammogram of (2-anthraquinonylmethyl)trimethylammonium bromide was linear in Kosower’s Z value over a wide range of DMF-water mixtures. Using this relationship, the anthraquinone moiety of (2-anthraquinonylmethyl)dodecyldimethylammonium bromide solubilized in cationic micelles was found to reside at the Stern layer.
DIRECT OBSERVATION OF GERMYL RADICALS BY A LASER-PHOTOLYSIS OF GERMYL KETONES
Authors: Mochida Kunio , Ichikawa Kyoko , Okui Shuko , Sakaguchi Yoshio , Hayashi Hisaharu
Published: July 2006

Photochemical primary processes of benzoyltriphenylgermane and benzoylphenyldimethylgermane were studied at room temperature in cyclohexane and chloroform. The germyl radicals generated were observed directly with the aid of a laser-photolysis technique.
CHELATION-CONTROLLED REGIOSELECTIVE EPOXIDE-CARBONYL REARRANGEMENT OF 1-OXASPIROHEXANE DERIVATIVES
Authors: Tobe Yoshito , Kishida Tohru , Yamashita Toshiro , Kakiuchi Kiyomi , Odaira Yoshinobu
Published: July 2006

Lithium bromide-catalyzed epoxide-carbonly rearrangement of 7,8-epoxy-7-methlenebicyclo[3.2.0]heptane derivatives gave 2,8-difunctionalized bicyclo[3.3.0]octanes in high selectivity.
REACTION OF 1,3-DIMETHYLURACIL, 1,3-DIMETHYLTHYMINE, AND CAFFEINE WITH CARBON RADICALS
Authors: Itahara Toshio , Seto Yuichi
Published: July 2006

Reaction of 1,3-dimethyluracil, 1,3-dimethylthymine, and caffeine with carbon radicals formed on treatment of carboxylic acids, silver nitrate, and ammonium peroxodisulfate was investigated.
FLAME-INDUCED CARBOXYLATION OF UNSATURATED AMINES IN AN AQUEOUS FORMIC ACID SOLUTION
Authors: Nomoto Shinya , Harada Kaoru
Published: July 2006

When a hydrogen-oxygen flame was kept in contact with an aqueous formic acid solution of unsaturated amines, carboxylation onto a double bond took place. This reaction revealed to be initiated by addition of a hydrogen atom to the double bond followed by coupling of the resulted substrate radical with a carboxyl radical.
STEREOSELECTIVE SYNTHESIS OF 3a,4,5,7a-TETRAHYDRO-5,7a-ETHANOPHTHALIDE DERIVATIVES USING SUCCESSIVE INTRA- AND INTERMOLECULAR DIELS–ALDER REACTIONS
Authors: Noguchi Michihiko , Kakimoto Shinji , Kajigaeshi Shoji
Published: July 2006

Some 2-pyrone-6-carboxylic acid esters bearing appropriate dienophiles at ester moieties underwent the intramolecular Diels–Alder reaction followed by the extrusion of carbon dioxide to give 3a, 4-dihydrophthalide derivatives. The dihydrophthalides added to the second dienophiles intermolecularly to give 3a,4,5,7a-tetrahydro-5,7a-ethanophthalide derivatives. The stereoselectivity of the 5,7a-ethanophthalides was liable for the two successive reactions.
A NEW METHOD FOR DEOXYGENATION OF TERTIARY AMINE N-OXIDES WITH ACETIC FORMIC ANHYDRIDE
Authors: Tokitoh Norihiro , Okazaki Renji
Published: July 2006

Trialkylamine N-oxides and N,N-dialkylarylamine N-oxides were readily deoxygenated with acetic formic anhydride in dichloromethane at room temperature to give the corresponding tertiary amines in high yields, while heteroaromatic N-oxide and sulfoxides were not affected.
NEW SYNTHETIC VESICLES FORMED BY POLYMERIC QUATERNARY AMMONIUM BROMIDE WITH DOUBLE ALKYL CHAINS
Authors: Cho Iwhan , Kim Chung-Soo
Published: July 2006

Sonic dispersal of 3-bromopropyldidodecylamine hydrogen bromide resulted in the formation of stable polymeric vesicles by quaternization reaction in aqueous solution. It could be expected that the amphiphilic aggregation and ultrasonic irradiation can facilitate the polymerization through the quaternization.
ESR STUDY OF CATION RADICALS OF TRIMETHYLSILYL- AND PENTAMETHYL-DISILANYL-SUBSTITUTED BENZENE AND RELATED COMPOUNDS. A SYSTEMATIC EXAMINATION OF THE ELECTRON DONOR-ACCEPTOR EFFECTS ON CYCLIC π RADICALS
Authors: Kira Mitsuo , Nakazawa Hiroko , Sakurai Hideki
Published: July 2006

The cation radical of [PhSiMe2SiMeo3]\overset+· has been found by ESR not to be regarded as a weakly perturbed benzene cation radical like [PhSiMe3]\overset+· but as an Si-Si σ cation radical similar to [Me3SiSiMe3]\overset+·.
SYNTHESIS AND REACTIVITY OF (E)-4,6,7-OCTATRIENOIC ACID SODIUM SALT IN THE AQUEOUS DIELS–ALDER REACTION
Authors: Yoshida Kiyoshi , Grieco Paul A
Published: July 2006

The aqueous Diels–Alder reaction between sodium (E)-4,6,7-octatrienoate and several standard dienophiles has been examined.
EFFECT OF A RESTRICTED REACTION FIELD (RRF) ON ENZYMATIC REACTIONS
Authors: Ozaki Hiroshi
Published: July 2006

The effect of a restricted reaction field (RRF) on activities of cytosolic and microsomal aminopeptidase was investigated. Activity of cytosolic enzyme increased with decrease in the space width of the RRF, while activity of microsomal enzyme was found to be sensitive to the nature of the surface of the RRF.
SYNTHESIS AND STRUCTURE CONFIRMATION OF RICCARDIN B, A MACROCYCLIC BIS(BIBENZYL) FROM THE LIVERWORT, RICCARDIA MULTIFIDA
Authors: Shiobara Yoshinori , Sumitomo Hisako , Tsukamoto Michiyo , Harada Chiemi , Kodama Mitsuaki
Published: July 2006

Riccardin B, a cytotoxic bis(bibenzyl) obtained from a liverwort was synthesized via an intramolecular Wittig-type reaction and the structure was established unequivocally.
PULSE RADIOLYSIS STUDIES OF ENERGY TRANSFER REACTIONS FROM BENZENE EXCIMER TO PHOSPHINE OXIDES
Authors: Sumiyoshi Takashi , Katayama Meiseki , Schnabel Wolfram
Published: July 2006

Acylphosphine oxides were tested as a new class of singlet indicators and the diphenyl phosphonyl radical was detected as a result of singlet energy transfer from benzene excimers to 2,4,6-trimethylbenzoyldiphenylphosphine oxide.
ORGANIC REACTIONS AT HIGH PRESSURE. DIELS–ALDER REACTIONS OF [2.2]PARACYCLOPHANE
Authors: Matsumoto Kiyoshi
Published: July 2006

[2.2]Paracyclophane which is totally inert to maleic anhydride and maleimides even at 180 °C and 1 bar does undergo Diels–Alder reactions with these dienophiles in kirobar region around 70 °C giving the 1:2 adducts in moderate yields.
THE FIRST ISOLATION AND SOME REACTIONS OF THE CATIONIC TRIHYDRIDES, [M(η-C5H5)2H3]+TsO− (M = W, Mo)
Authors: Igarashi Tadashi , Ito Takashi
Published: July 2006

MCp2H2 [M = W (1a), Mo (1b); Cp = η-C5H5] was protonated with TsOH to give [ MCp2H3]+TsO− [M = W (2a), Mo (2b)], which was isolated and characterized spectroscopically. 2a and 2b reduced acetone to i-PrOH indicating their more hydridic nature as compared to 1a and 1b. Complex 2b reacted with Lewis bases and allyl alcohols to give [MoCp2H(L)]+TsO− (L = CO, PPh3, MeOH) and cyclic γ-hydroxyalkyl complexes, respectively.
PHOTOLYSIS OF HYDROPHOBIC VITAMIN B12 DERIVATIVES WITH ALKYL LIGANDS IN NONAQUEOUS MEDIA
Authors: Murakami Yukito , Hisaeda Yoshio , Ozaki Toshiaki , Ohno Teruhisa
Published: July 2006

Aerobic photolysis of hydrophobic vitamin B12 derivatives having alkyl ligands was enhanced as the solvent polarity was reduced and by the coordination of a proximal base placed within the hydro-phobic complexes. The quantum yield remained constant regardless of the irradiation wavelength.
ORIGIN OF AMPHIELECTRONIC EFFECT OF σ- AND π-ELECTRON-WITHDRAWING GROUPS ON σ− APPLICATION SYSTEMS AND ELECTRON-DEFICIENT SYSTEMS
Authors: Inamoto Naoki , Masuda Shozo
Published: July 2006

Nonlinearity of data for σ and π-electron-withdrawing groups (EWG) with Δι values in σ− application systems was improved by consideration of difference of electronegativities between atoms A and B in substituent –A=B. This idea was also applied to π-donating effect of EWG in very electron-deficient system such as XCH2+.
SPECTRAL CHARACTERISTICS AND EFFICIENT ENERGY TRANSFER IN NAPHTHALENE-CONTAINING BILAYER MEMBRANES
Authors: Nakashima Naotoshi , Kimizuka Nobuo , Kunitake Toyoki
Published: July 2006

Bilayer membranes of double-chained ammonium amphiphiles which contain the naphthalene unit display characteristic spectral (absorption and emission) behavior and efficient energy transfer to membrane-bound anionic acceptors.
REACTION OF CEPHALOSPORIN 3′-TRIPHENYLPHOSPHONIUM YLIDE. SYNTHESIS OF A NOVEL TRICYCLIC CEPHALOSPORIN
Authors: Hatanaka Minoru , Yamamoto Yuichi , Ishimaru Toshiyasu , Takai Yoshio
Published: July 2006

Reaction of cephalosporin 3′-triphenylphosphonium ylide with glyoxal gave a good yield of new cephalosporin derivative which possessed tricyclic framework bridged between the C-2 and C-3′ positions.
A NEW DEPOSITING METHOD OF LANGMUIR–BLODGETT FILM OF FATTY ACID SOAP AS A RADIOACTIVE SOURCE
Authors: Iwahashi Makio , Naito Fujio , Watanabe Norifumi , Seimiya Tsutomu
Published: July 2006

A stable radioactive source in vacuo was obtained by a new depositing method of Langmuir–Blodgett (L/B) film. In spite of the slight consumption of the substrate solution (only 2–2.5 ml) for preparing a 15 mm × 25 mm sized L/B film containing four molecular layers of 109Cd-eicosanoate, the deposition of the film was complete.
THE HIGHLY STEREOSELECTIVE SYNTHESIS OF ALL-TRANS AND 13-CIS VITAMIN A VIA DOUBLE ELIMINATION REACTION
Authors: Otera Junzo , Misawa Hiromitsu , Mandai Tadakatsu , Onishi Takashi , Suzuki Shigeaki , Fujita Yoshiji
Published: July 2006

Stereocontrolled convergent synthesis of vitamin A was achieved by the double elimination method employing the C10 sulfone and the C10 aldehydes as starting materials. Thus the all-trans and 13-cis isomers were obtained with the stereochemical purity of 95% and 90%, respectively.
NEW CHIRAL STATIONARY PHASES FOR OPTICAL RESOLUTION. OPTICALLY ACTIVE POLYAMIDES HAVING (−)-ANTI HEAD-TO-HEAD COUMARIN DIMER COMPONENT
Authors: Saigo Kazuhiko , Chen Yun , Yonezawa Noriyuki , Tachibana Kouzou , Kanoe Toshio , Hasegawa Masaki
Published: July 2006

Optically active polyamides having (−)-anti head-to-head coumarin dimer component were found to be useful as chiral packing materials for direct HPLC resolution of enantiomers such as trans-stilbene oxide, mandelamide, benzyl mandelate, benzoin, trans-1,2-cyclobutanedicarboxanilide, and 2,2′-dihydroxy-1,1′-binaphthyl.
THREE SPECIES OF PEROXOMOLYBDENUM PORPHYRINS FOUND IN THE REACTION OF OXO(5,10,15,20-TETRAKIS(4-N-METHYLPYRIDYL)PORPHINATO)MOLYBDENUM(V) WITH HYDROGEN PEROXIDE
Authors: Inamo Masahiko , Funahashi Shigenobu , Ito Yoshio , Hamada Yoshiki , Tanaka Motoharu
Published: July 2006

The reaction of oxo(5,10,15,20-tetrakis(4-N-methylpyridyl)porphinato)molybdenum(V) ([MoVO(tmpyp)(OH2)]5  +) with H2O2 under different conditions produced three different species of peroxomolybdenum complexes, i.e., [MoVO(O2 )(tmpyp)]3+, [MoVI(O2)(tmpyp)(OH2)]6+, and [MoVI(O2)2(tmpyp)]4+.
SURFACE ANALYSIS OF SUSPENDED PARTICLES IN ESTUARINE AND COASTAL WATERS USING X-RAY PHOTOELECTRON SPECTROSCOPY
Authors: Akagi Tasuku , Fuwa Keiichiro , Haraguchi Hiroki
Published: July 2006

Surface compositions of suspended particles in estuarine and coastal waters were examined by X-ray photoelectron spectroscopy (XPS). It has been found that the surface compositions markedly changed, depending on the sampling locations in the estuarine and coastal areas.
XPS STUDIES OF SURFACE NITROGEN DISSOCIATED FROM DINITROGEN ON RANEY RUTHENIUM
Authors: Ogata Yoichi , Aika Ken-ichi , Onishi Takaharu
Published: July 2006

Atomic nitrogen species on Raney-Ru was studied by means of XPS in connection with isotopic equilibration reaction. Binding energy of a main N ls peak stable up to 673 K was 397.4 eV, which was assigned to be N(a). When the adsorbed nitrogen was heated from 673 K to 873 K under hydrogen atmosphere, the value shifted to 396.7 eV suggesting the formation of aluminum nitride.
HIGH PRESSURE IN SITU FT-IR STUDY OF CO HYDROGENATION OVER Rh/SiO2 CATALYST
Authors: Arakawa Hironori , Fukushima Takakazu , Ichikawa Masaru , Takeuchi Kazuhiko , Matsuzaki Takehiko , Sugi Yoshihiro
Published: July 2006

The behavior of adsorbed CO and reaction intermediates on Rh/SiO2has been observed at high pressure CO hydrogenation condition by in situ FT-IR spectroscopy. A good relationship exists between turnover frequency of CO conversion and the ratio of bridged-CO/linear-CO adsorbed on Rh/SiO2 at the reaction condition in terms of Rh dispersion of catalysts. Turnover frequency increases with the increase of this ratio as a general trend. Two kinds of acetate species as reaction products on SiO2 have been observed.
SODIUM SULFIDE AS A SELECTIVE REDUCING REAGENT FOR ALDEHYDES TO ALCOHOLS. USE OF ALUMINA AS AN EFFECTIVE CATALYST
Authors: Kamitori Yasuhiro , Hojo Masaru , Masuda Ryoichi , Yamamoto Masaki
Published: July 2006

Intrinsic reactivity of sodium sulfide is well controlled by impregnating it on alumina, so that aldehydes can be readily reduced to the corresponding alcohols, while ketones, esters and even nitro compounds are all inert toward this reagent.
SENSITIZING ACTIONS OF AROMATIC KETONES ON ISOMERIZATION OF NORBORNADIENE TO QUADRICYCLENE
Authors: Arai Tatsuo , Wakabayashi Toshio , Sakuragi Hirochika , Tokumaru Katsumi
Published: July 2006

The quantum yields for norbornadiene to quadricyclene isomerization were measuerd in acetonitrile using several triplet sensitizers. Among benzophenones employed as sensitizers which have nearly the same triplet excitation energies, those with electron-donating substituents exhibited higher efficiency than those with electron-accepting substituents.
SYNTHESIS OF TRICYCLO[5.3.2.01,6]DODECENONES
Authors: Kakiuchi Kiyomi , Takeda Mitsunori , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

A new type of biologically active tricyclo[5.3.2.01,6]dodecenones related to quadrone and terrecyclic acid A has been synthesized.
SYNTHESIS OF TWO STEREOISOMERS OF SWAINSONINE
Authors: Yasuda Nobuyoshi , Tsutsumi Hideo , Takaya Takao
Published: July 2006

Two stereoisomers of swainsonine, (1S,2S,8S,8aR)-1,2,8-trihydroxyoctahydroindolizine and the corresponding (1S,2R,8S,8aR) derivative, were synthesized from d-glucose via one step cyclization to the 5-oxo-1,2,8-trihydroxyoctahydroindolizine derivative.
SYNTHESIS OF CYCLOPROPYLDIAMINOOXOSULFONIUM SALTS BY THE REACTION OF DIAMINOOXOSULFONIUM YLIDES WITH ALDEHYDES
Authors: Okuma Kentaro , Nakanishi Kazuto , Honda Takumi , Ohta Hiroshi , Yokomori Yoshinobu , Sekido Kiyotane
Published: July 2006

The title compounds have been synthesized by the reaction of diaminooxosulfonium methylides with aldehydes as isomeric mixtures in good yields. These ylides reacted with aldehydes to give betaines, which formed unusual four-membered cyclic alkoxyoxosulfonium salts. Another methylide further attacked α-carbon of these salts to afford cyclopropyldiaminooxosulfonium salts.
FACILE SYNTHESIS OF TIN(IV) CARBOXYLATES
Authors: Wakeshima Ikuko , Tamura Akira , Yokoyama Yasushi , Kijima Ichiro
Published: July 2006

Tin powders (Sn) or tin(II) chloride (SnCl2) reacted readily with copper(II) carboxylates [Cu(O2CR)2] in an organic solvent to give the corresponding tin(IV) carboxylates [Sn(O2CR)4] in exellent yields.
PREPARATION OF AROMATIC IODIDES FROM BROMIDES VIA THE REVERSE HALOGEN EXCHANGE
Authors: Suzuki Hitomi , Kondo Akiko , Ogawa Takuji
Published: July 2006

Aromatic bromides undergo halogen exchange reaction with iodide ion in the presence of copper(I) iodide in hot hexamethylphosphoric triamide, to give the corresponding iodides in good to moderate yields.
PREPARATION AND CHARACTERIZATION OF HYDROPHOBIC VITAMIN B12 COMPLEXES HAVING A PROXIMAL BASE
Authors: Murakami Yukito , Hisaeda Yoshio , Ozaki Toshiaki
Published: July 2006

Hexamethyl cobyrinate complexes having an imidazolyl segment as a proximal base, with and without the axial cyano ligands, were prepared and characterized by means of electronic, CD, H-NMR, and ESR spectroscopy. The redox behavior of the complex without the axial cyano ligands was examined by cyclic voltammetry.
INTRAMOLECULAR ALKYLATION OF VINYLGERMANES AND IODODEGERMYLATION OF 1-CYCLOALKENYLGERMANES
Authors: Oda Hiroji , Oshima Koichiro , Nozaki Hitosi
Published: July 2006

Whereas 2-methyl-2,3-epoxy-6-triethylgermyl-6-tridecene gave the expected alkylidenecyclopentanol upon treatment with TiCl4, 5-triethylgermyl-5-dodecenal dimethyl acetal provided the unexpected cyclohexene derivative. Transformation of 1-triethylgermylcycloalkenes into 1-iodocycloalkenes is also described.
MORPHOLOGY AND CONDUCTIVITY OF POLYPYRROLE CONTAINING HALOGEN COUNTER ANIONS
Authors: Tokito Sizuo , Tsutsui Tetsuo , Saito Shogo
Published: July 2006

Polypyrroles containing halogen anions as dopants were electrochemically prepared in aqueous solutions. Morphologies of the polypyrroles were found to depend on halogen anion species. The conductivities of the polypyrrole films were around 10 S/cm.
THE CRYSTAL AND ELECTRONIC STRUCTURES OF A NEW MOLECULAR CONDUCTOR, (TMTSF)[Ni(dmit)2]
Authors: Kobayashi Hayao , Kato Reizo , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

The crystal of (TMTSF)[Ni(dmit)2] has a 9-fold superstructure. The amplitude of the transverse sinusoidal lattice modulation wave (≅1 Å) is extremely large compared with that of usual Peierls distortion wave. Despite of the high room-temperature conductivity (≅300 Scm−1), this system is a semiconductor (Ea(R.T.)=0.034 eV). The fundamental structure is composed of segregated uniform stacks of TMTSF and Ni(dmit)2.
SECONDARY CELLS USING POLY(2,5-THIENYLENE)S AND POLY(2,5-PYRROLYLENE)S AS MATERIALS FOR POSITIVE ELECTRODES. Zn|ZnI2|I2 SECONDARY CELL
Authors: Yamamoto Takakazu , Zama Masanobu , Yamamoto Akio
Published: July 2006

Poly(2,5-thienylene), poly(2,5-pyrrolylene), and their derivatives are useful as materials for positive electrodes of Zn|ZnI2|cation-exchange membrane|ZnI2|I2 secondary cells, which show about 100% current efficiency and 85% energy efficiency and are rechargeable more than 200 times.
PREPARATION AND REACTIONS OF NOVEL μ-OXO-BISANTIMONY AMINOALKOXIDE
Authors: Nomura Ryoki , Kori Masakuni , Matsuda Haruo
Published: July 2006

Novel μ-oxo-bis(diphenylhydroxyantimony) di[2-(methylamino)ethoxide] (1) was obtained in the reaction of triphenylstibine oxide and 2-(methylamino)ethanol. Cyclic urethane derivatives were obtained by the reaction of 1 with CO2 or CS2 in good yields.
PHOTOGENERATION OF HYDROGEN FROM WATER WITH MIXED SEMICONDUCTOR CATALYST
Authors: Kobayashi Junya , Kitagushi Kenichi , Tsuiki Hideyasu , Ueno Akifumi , Kotera Yoshihide
Published: July 2006

Alumina-supported mixed semiconductor catalyst, ZnS·CdS/Al2O3, showed a significant rate of hydrogen generation from water under UV irradiation without an assistance of any noble metals. Singly supported catalyst, ZnS/Al2O3 or CdS/Al2O3, showed, however, less activity for photogeneration of hydrogen. The activity was not improved by physical mixture of ZnS/Al2O3 and CdS/Al2O3 although the amount of ZnS and CdS were the same as those in the ZnS·CdS/Al2O3 catalyst. This indicates that the intimate contacts between ZnS and CdS particles are necessary to photogeneration of hydrogen.
HIGHLY SELECTIVE FORMATION OF LINEAR-CONJUGATED DIENOLATE ANIONS FROM CONJUGATED ENONES
Authors: Kawanisi Mituyosi , Itoh Yasuko , Hieda Takanori , Kozima Sinpei , Hitomi Torazo , Kobayashi Kazuko
Published: July 2006

Treatment of conjugated enones having both α′- and γ -hydrogens with KN(SiMe3)2 (KHMSA) in a mixed solvent of DMF with THF at −78 °C afforded preferentially linear-conjugated dienolate anions, which were trapped by methyl chloroformate to give the corresponding dienyl methyl carbonates.
POROUS AND AMORPHOUS Ni67Zr33 CATALYST PREPARED BY HYDROGENATION OF CARBON MONOXIDE
Authors: Shimogaki Yukihiro , Komiyama Hiroshi , Inoue Hakuai , Masumoto Tsuyoshi , Kimura Hisamich
Published: July 2006

Porous structure of ample specific surface area as catalyst, of 5.3 m2/g, has been successfully developed in the amorphous Ni67Zr33 ribbon of 0.05 m2/g by the hydrogenation of carbon monoxide at 538 K. The porous and amorphous catalyst shows stable catalysis for the hydrogenation reaction below 493 K.
A NOVEL SYNTHESIS OF β-KETO ALKYLATED 1,4-QUINONE
Authors: Maruyama Kazuhiro , Tai Seiji
Published: July 2006

Many β-keto alkylated 1,4-quinones were synthesized facilely by photochemical reaction of 2-methyl- or 2-methoxy-1,4-quinones with 2-methoxy- or 2-trimethylsilyloxy-1-alkenes and subsequent oxidation of the photo-products under acidic conditions.
A NEW APPROACH TO ARYLMALONONITRILES
Authors: Yamaguchi Shunro , Araki Hisashi , Hanafusa Terukiyo
Published: July 2006

Arylmalononitriles were prepared from the corresponding benzoyl chlorides by three reaction steps . Treatment of the starting substances with cyanotrimethylsilane in the presence of pyridine gave dicyanotrimethylsiloxymethylbenzenes, which were transformed into chlorodicyanomethylbenzenes with POCl3-pyridine in the second step. Finally, reduction of chlorodicyanomethylbenzenes with Zn–CH3CO2H afforded arylmalononitriles.
STRUCTURAL ELUCIDATION OF MARINE HALOGENATED MONOTERPENES BY 2D-NMR AND NOE DIFFERENCE SPECTROSCOPY. A STEREOCHEMICAL CORRECTION
Authors: Sardina F Javier , Quiñoá Emilio , Castedo Luis , Riguera Ricardo
Published: July 2006

A new methodology for structural elucidation of polyhalogenated monoterpenes is presented. It makes extensive use of correlated 2D-NMR and NOEDS and shows that the structures of coccinene and its bromovinyl analog must be corrected to their C-2 epimers.
XESTOQUINONE. A NOVEL CARDIOTONIC MARINE NATURAL PRODUCT ISOLATED FROM THE OKINAWAN SEA SPONGE XESTOSPONGIA SAPRA
Authors: Nakamura Hideshi , Kobayashi Jun’ichi , Kobayashi Masaki , Ohizumi Yasushi , Hirata Yoshimasa
Published: July 2006

A new pentacyclic quinone, xestoquinone was isolated from the Okinawan sea sponge Xestospongia sapra as a cardiotonic constituent and the structure was identified from its spectral data.
THE PHOTO-REARRANGEMENT OF HYPOIODITES GENERATED FROM CYCLOBUTANOLS FORMED BY MEANS OF 2+2 PHOTOCYCLOADDITION BETWEEN 4-HYDROXY-2-QUINOLO AND CYCLOALKENE OR ALKENE TO 2,3-FURANOQUINOL-4-ONES
Authors: Suginome Hiroshi , Kobayashi Kazuhiro , Itoh Masahito , Furusaki Akio
Published: July 2006

The irradiation of hypoiodites generated from cyclobutanols prepared by means of N-methylation and hydrolysis of 2+2 photocycloadducts between 4-acetoxy-2-quinolone and cyclopentene or 2,3-dimethylbut-2-ene induced rearrangements of the corresponding alkoxy radicals to give 2,3-furanoquinol-4-ones or a ring expanded product.
A NOVEL METHOD FOR THE PREPARATION OF SYMMETRICAL AND UNSYMMETRICAL ETHERS. TRITYL PERCHLORATE PROMOTED REDUCTION OF CARBONYL COMPOUNDS WITH TRIETHYLSILANE
Authors: Kato Jun-ichi , Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, symmetrical ethers are prepared from aldehydes and triethylsilane, and unsymmetrical ethers are also obtained from carbonyl compounds, alkoxytrimethylsilanes and triethylsilane, in good yields, respectively.
HEPTAFLUOROPROPYLATION OF ELECTRON-RICH OLEFINS WITH BIS(HEPTAFLUOROBUTYRYL) PEROXIDE
Authors: Yoshida Masato , Moriya Koji , Sawada Hideo , Kobayashi Michio
Published: July 2006

Bis (heptafluorobutyry) peroxide reacted with electron-rich olefins to give the adducts of C3F7CO2 and C3F7 groups in good yields. The peroxide should be the useful reagent for the introduction of heptafluoropropyl moiety into olefins.
A SIMPLE PREPARATIVE METHOD FOR OPTICALLY PURE 1-ALKENYL p-TOLYL SULFOXIDES VIA 1-ALKYNYL p-TOLYL SULFOXIDES
Authors: Kosugi Hiroshi , Kitaoka Masaki , Tagami Katsuya , Uda Hisashi
Published: July 2006

1-Alkynyl Grignard reagents react with (SS)-(−)-menthyl p-toluenesulfinate in toluene to give optically active 1-alkynyl p-tolyl sulfoxides in high yields. The 1-alkynyl sulfoxides thus obtained undergo a stereoselective hydroalumination followed by hydrolysis to afford the corresponding (E)-1-alkenyl p-tolyl sulfoxides with high optical purity.
(E)-3,3,3-TRIFLUORO-1-PROPENYL PHENYL SULFOXIDE. A USEFUL BUILDING BLOCK FOR TRIFLUOROMETHYLATED ORGANIC MOLECULES
Authors: Yamazaki Takashi , Ishikawa Nobuo
Published: July 2006

(E)-3,3,3-trifluoro-1-propenyl phenyl sulfoxide as the building block for the introduction of trifluoromethyl group was prepared from ethyl trifluoroacetate in three steps (72% yield) and high diastereoselectivity was observed for the Michael reaction of this compound with various enolate anions.
THE REGIOSELECTIVE EFFECT OF THE ALLYLIC SILICON OR OXYGEN ATOM IN 1,3-DIPOLAR CYCLOADDITION OF NITRONES
Authors: Niwayama Satomi , Dan Shigeyuki , Inouye Yoshinobu , Kakisawa Hiroshi
Published: July 2006

1,3-Dipolar cycloaddition of nitrones on several allyl silanes, allyl ethers, and allyl alcohol was investigated. The silicon atom in dipolarophiles controlled the regioselectivity in favor for 5-(silylmethyl)isoxazolidines, while the oxygen atom for 4-(alkoxymethyl)isoxazolidines.
REACTION OF 9-t-BUTYL-10-METHYL-9,10-ENDOTRIOXY-9,10-DIHYDROANTHRACENE WITH TRANSITION METAL COMPOUNDS
Authors: Matsuura Akira , Nishinaga Akira , Ito Yoshikatsu , Matsuura Teruo
Published: July 2006

9-t-butyl-10-methyl-9,10-endotrioxy-9,10-dihydroanthracene underwent reductive decomposition readily with transition metal compounds having one-electron reducibility to result unexpectedly in the specific cleavage of the shorter O–O bond close to the t-butyl group in the trioxide finally giving rise to 10-methyloxanthrone and t-butyl alcohol. A plausible mechanism is discussed.
OXIDATION OF cis-DIALKYLCOBALT(III) COMPLEXES BY OXYGEN. ACTIVATION OF OXYGEN BY PERCHLORIC ACID
Authors: Fukuzumi Shunichi , Ishikawa Kunio , Tanaka Toshio
Published: July 2006

The effects of protons on the reactions of cis-dialkylcobalt(III) complexes, cis-[R2Co(bpy)2]ClO4 (R = Me, Et, PhCH2; bpy = 2,2′-bipyridine), with oxygen are reported. Oxygen is shown to be activated in the presence of perchloric acid by forming hydroperoxonium ion which has a much stronger oxidizing ability than oxygen.
A NOVEL METHOD FOR THE STEREOSELECTIVE SYNTHESIS OF β-AMINOACID DERIVATIVES VIA TIN(II) CARBOXYLIC THIOESTER ENOLATES
Authors: Yamasaki Noritsugu , Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

Tin(II) carboxylic thioester enolates, formed in situ from stannous 2-methyl-2-propanethiolate and ketenes, react with imines in the presence of stannous triflate to give the corresponding β-aminocarboxylic thioesters in an anti-selective manner. This method is successfully applied to a diastereoselective synthesis of a carbapenem antibiotic PS-5 intermediate.
PHOTOCONDUCTING BEHAVIOR IN RELATION TO PHASE TRANSITIONS. 5,10,15,20-TETRAKIS(4-PENTADECYLPHENYL)PORPHYRIN
Authors: Shimizu Yo , Ishikawa Atsushi , Kusabayashi Shigekazu
Published: July 2006

5,10,15,20-Tetrakis(4-pentadecylphenyl)porphyrin(1) exhibited large changes of the photo- and the dark-current ratio(ip/id) through the phase transitions, which ranged from 300 to 0.22 between 27 °C (the crystalline phase) and 140 °C (the isotropic liquid phase) for a sandwich-type cell of ITO(25 μm-thick). The photocurrent decreased as the temperature increased, while the inverse situation was shown for the darkcurrent.
“TRIPODE”-TYPE IONOPHORE FOR SPECIFIC TRANSPORT OF Ag+ ION
Authors: Tsukube Hiroshi , Takagi Kentaro , Higashiyama Tatsuo , Iwachido Tadashi , Hayama Naomi
Published: July 2006

“Tripode”-type ionophore, tris(dioxa-3,6-heptyl)amine, showed specific transport properties especially for Ag+ ion, which were largely different from those observed with common double armed crown ether and bicyclic cryptand ionophores.
The Pressure Effect on the 1,5-Sigmatropic Hydrogen Shift of Tropylidene Derivative, 3,3-Diphenyl-3,3a-dihydrocyclohepta[b]furan-2-one
Authors: Sugiyama Shigeru , Takeshita Hitoshi
Published: July 2006

The 1,5-sigmatropy of 3,3-diphenyl-3,3a-dihydrocyclohepta[b]furan-2-one was examined in dibutyl ether to 1600 bar at 130 °C. The rearrangement was slightly accelerated with pressure, and was different to the pressure effect of 1,5-sigmatropy of cyclopentadienes. The activation volume was in the range of the concerted process, but its transition state was as loose as those biradical-like.
Preparation of Thiolate-Bridged Diruthenium Complexes with Ru–Ru Single Bond
Authors: Hidai Masanobu , Imagawa Kiyomi , Cheng Guobao , Mizobe Yasushi , Wakatsuki Yasuo , Yamazaki Hiroshi
Published: July 2006

Reactions of [Cp*RuCl2]n (Cp* = η5-C5Me5) with ArSH (Ar = Ph, p-ClC6H4 or p-MeC6H4) in CH2Cl2 gave diruthenium complexes [Cp*2Ru2(SAr)3]Cl in high yields. X-Ray analysis of the complex (Ar = Ph) disclosed the existence of the Ru–Ru bond triply bridged by SPh groups. On the other hand, analogous treatment of [Cp*RuCl2]n with PhCH2SH resulted in the formation of a neutral complex [Cp*2Ru2(SCH2Ph)2Cl2].
Enantioselective Synthesis of (2S,3S)-2,3-Dihydroxyalkanoates by the Baker’s Yeast Reduction of 2-Hydroxy-3-oxoalkanoates
Authors: Sato Toshio , Tsurumaki Masaji , Fujisawa Tamotsu
Published: July 2006

The baker’s yeast reduction of ethyl (±)-2-hydroxy-3-oxoalkanoates predominantly gave highly optically pure ethyl (2S,3S)-2,3-dihydroxyalkanoates.
Pressure Effect on the P–H and 13C–H Spin-Spin Coupling Constants in Diphenylphosphine and Diphenylmethane-α-13C in Chloroform
Authors: Yamada Hiroaki , Furubayashi Kaoru , Sera Akira , Ueji Shinichi , Azumi Kazuko
Published: July 2006

Upon pressurization, 1JP-H in Ph2HP has been found to increase notably, while 1J13C-H in Ph2  13CH2 has been observed to remain nearly unaffected. An increased hydrogen bonding interaction between phosphorus lone pair electrons and chloroform is considered to be responsible to the pressure induced change in 1JP-H.