bluuebunny/crossref_metadata_2025_split huggingface dataset:
THE HIGHLY STEREOSELECTIVE SYNTHESIS OF PERBENZYLATED α,α-TREHALOSE AND ITS d-GALACTO AND d-MANNO ANALOGS
Authors: Yoshimura Juji , Hara Kazutoshi , Sato Tatsuya , Hashimoto Hironobu 
Published: July 2006

Abstract
Treatment of 2,3,4,6-tetra-o-benzyl-1-o-trimethylsilyl-α,β-d-glucopyranose in dichloromethane with trimethylsilyl triflate catalyst gave the corresponding α,α- and α,β-trehaloses in quantitative yield. A similar treatment of d-galacto and d-manno analogs gave exclusively the corresponding α,α-anomers, respectively.
COLLISIONAL RELAXATION OF H2CS (\ ildeA1A2, V4′=1)
Authors: Kawasaki Masahiro , Kasatani Kazuo , Uchida Toyohisa , Sato Hiroyasu 
Published: July 2006

Abstract
Fluorescence spectra of single vibronic levels of the first excited singlet state of H2CS have been measured under effusive flow conditions as a function of pressure. Weak non-resonance bands grow in with increasing pressure, demonstrating the existence of collisional vibrational relaxation of the 41 level to the 40 level.
THE PRESENCE OF OLIGOMERIC AROMATIC STRUCTURES IN POLYAROMATICS AND POLAR MATERIALS FROM COAL-DERIVED HEXANE SOLUBLES
Authors: Nomura Masakatsu , Kurosaki Takayuki , Miyake Mikio 
Published: July 2006

Abstract
Polyaromatics and polar materials of coal-derived hexane soluble were separated according to molecular size. UV spectra combined with their mass spectra revealed that the high-molecular-weight fractions consist of oligomer structures such as small aromatic units joining by methylene bridges and/or biaryl bonds.
FORMATION OF 1-NITRO-2-HYDROXYPYRENE FROM 1-NITROPYRENE BY PHOTOLYSIS
Authors: Yasuhara Akio , Fuwa Keiichiro 
Published: July 2006

Abstract
1-Nitropyrene was converted by photolysis to a new compound, deep red needles, which was identified to be 1-nitro-2-hydroxypyrene.
SELECTIVE HYDROXYLATION OF THYMINE BY 2,2,6,6-TETRAMETHYL PIPERIDINE-1-OXYL BROMIDE IN AQUEOUS SOLUTION
Authors: Kagiya Tsutomu , Komuro Chikara , Sakano Koichi , Nishimoto Sei-ichi 
Published: July 2006

Abstract
2,2,6,6-Tetramethylpiperidine-1-oxyl bromide (TMPO+Br−) was found to mediate selectively the hydroxylation of thymine by water into thymine glycol at room temperature. Almost quantitative yield of thymine glycol was obtained at the molar ratio of [TMPO+Br−]0/[Thymine]0 = 2 in feed under neutral conditions. The reaction mixture showed the ESR spectrum characteristic of 2,2,6,6-tetramethylpiperidine-1-oxyl (TMPO·).
1H NMR STUDY OF THE LIGAND EXCHANGE REACTION IN TETRAKIS(2,4-PENTANEDIONATO)THORIUM(IV)
Authors: Fujiwara Naoshi , Tomiyasu Hiroshi , Fukutomi Hiroshi 
Published: July 2006

Abstract
The rate of ligand exchange in tetrakis(2,4-pentanedionato)thorium(IV) was first measured by the 1H NMR line-shape analysis. The observed first-order rate constant is proportional to the concentration of free 2,4-pentanedione in enol form and the exchange is retarded by the addition of bases such as dimethyl sulfoxide and N,N-dimethylformamide.
STEREOSELECTIVE HYDROLYSIS OF ENANTIOMERIC AMINO ACID ESTERS CATALYZED BY PENTAAMMINE-l-HISTIDINERUTHENIUM(III) AND ANIONIC SURFACTANTS
Authors: Sakaki Shigeyoshi , Nakano Yoshifumi , Ohkubo Katsutoshi 
Published: July 2006

Abstract
Stereoselective hydrolysis of enantiomeric N-acyl-l(or d)-phenylalanine p-nitrophenyl ester, H–(CH2)n−1CONHCH(CH2Ph)CO2C6H4–NO2-p (n=2, 10, or 16), was carried out with pentaammine-l-histidineruthenium(III) and anionic surfactants. The highest selectivity of 4.2 was obtained for n=10, by using bilayer membranes, di-2-ethylhexyl sodium sulfosuccinate.
ELECTROLYTIC PRODUCTION OF PHENOLS FROM BENZENE USING Cu(I)/Cu(II) COUPLE
Authors: Sasaki Kazuo , Ito Sotaro , Kinoshita Tatsuyuki , Harada Junji 
Published: July 2006

Abstract
Phenol can be produced continuously from benzene by aerial oxidation in an aqueous sulfuric acid when Cu(I)/Cu(II) couple is used as a current mediator. Experimental conditions to optimize the phenol production are discussed.
CHARACTERIZATION OF MONO- AND OLIGOSACCHARIDES PRODUCED BY CO2 LASER IRRADIATION ON CELLULOSE
Authors: Suzuki Jun , Azuma Jun-ichi , Koshijima Tetsuo , Okamura Keizo , Okamoto Hajime 
Published: July 2006

Abstract
The chemical structures of three mono-, two di-, and two trisaccharides (1∼7) isolated from the pyrolysis products formed by CO2 laser irradiation on cellulose were investigated.
AN INHIBITORY EFFECT OF Mg2+ ION BY THE COMPLEX FORMATION WITH 1-BENZYL-1,4-DIHYDRONICOTINAMIDE ON THE REDUCTION OF 7,7,8,8-TETRACYANO-p-QUINODIMETHAN
Authors: Fukuzumi Shunichi , Kondo Yuji , Tanaka Toshio 
Published: July 2006

Abstract
A 1 : 1 complex formed between 1-benzyl-1,4-dihydronicotinamide (BNAH) and Mg2+ ion with the formation constant (1.2±0.1) ×104 mol−1 dm3 at 298 K causes the 23 fold decrease in the rate constant for the reduction of 7,7,8,8-tetracyano-p-quinodimethan by BNAH.
REACTION OF PYRIDINIUM PHENACYLIDES AND RELATED YLIDES WITH CYCLOPENTADIENONE DERIVATIVES
Authors: Yamashita Yoshiro , Miyauchi Yukio , Masumura Mitsuo 
Published: July 2006

Abstract
Reaction of pyridinium phenacylides with cyclopentadienone derivatives gave bicyclo[3.1.0]hex-3-en-2-one derivatives by the nucleophilic addition reaction followed by pyridine elimination. Isoquinolinium phenacylide underwent the 1,3-dipolar cycloaddition reaction with a cyclopentadienone.
MECHANISM OF THE PHOTOINDUCED REARRANGEMENT OF 5α-ANDROSTAN-17β-OL HYPOIODITE TO 13α- AND 13β-FORMYLOXY-16-IODO-13,16-SECO-d-NOR-5α-ANDROSTANE IN THE PRESENCE OF HgO AND I2—AN 18O LABELING STUDY
Authors: Suginome Hiroshi , Yamada Shinji , Miyaura Norio 
Published: July 2006

Abstract
An 18O labeling study indicates that the title rearrangement involves a novel intramolecular combination between a carbonyl oxygen and a carbon radical which are generated by a β-scission of an oxyl radical.
FORMATION OF α-TRICHLOROSTANNYL KETONES IN THE REACTION OF STANNIC CHLORIDE WITH ENOL SILYL ETHERS
Authors: Nakamura Eiichi , Kuwajima Isao 
Published: July 2006

Abstract
The enol silyl ethers of ketones reacted with SnCl4 to give α-trichlorostannyl ketones in moderate to good yields, and their structures were determined by chemical and spectral means. The reaction mechanism is also discussed.
COMPLEX FORMATION OF WATER-SOLUBLE PORPHYRIN WITH CYCLODEXTRIN
Authors: Hirai Hidefumi , Toshima Naoki , Hayashi Shinji , Fujii Yasufumi 
Published: July 2006

Abstract
Interactions of monomer forms of protoporphyrin IX, deuteroporphyrin IX, hematoporphyrin IX, and coproporphyrin III, respectively, with α- and γ-cyclodextrin in 0.002 mol·dm−3 NaOH aqueous solution are indicated by change of electronic spectrum and induction of circular dichroism. Dimerization constant of porphyrin and complex formation constant of porphyrin with cyclodextrin are also determined from the electronic spectra.
DEHYDROGENATION OF HYDROGEN MOLYBDENUM BRONZE, H0.3MoO3
Authors: Sotani Noriyuki , Kunitomo Masakazu , Hasegawa Masatomo 
Published: July 2006

Abstract
Hydrogen molybdenum bronze, H0.3MoO3, is decomposed through two processes on vacuum heating with evolution of H2O. One is the low-temperature process without structural change. The other is the high-temperature process with structural change from the bronze to MoO3* which is a non-stoichiometric MoO3 structure.
ISOLATION AND STRUCTURES OF HELIOSCOPINOLIDES, NEW DITERPENES FROM EUPHORBIA HELIOSCOPIA L.
Authors: Shizuri Yoshikazu , Kosemura Seiji , Yamamura Shosuke , Ohba Shigeru , Ito Masatoki , Saito Yoshihiko 
Published: July 2006

Abstract
Three new diterpenes, helioscopinolides A, B and C, have been isolated from the plant Euphorbia helioscopia L., and their stereostructures also been elucidated on the basis of their spectral and chemical data coupled with an X-ray crystallographic analysis of helioscopinolide A.
STEREOSELECTIVE SYNTHESIS OF l-DAUNOSAMINE
Authors: Mukaiyama Teruaki , Goto Yukihisa , Shoda Shin-ichiro 
Published: July 2006

Abstract
l-Daunosamine was conveniently synthesized from β-amino amide 1 obtained by the stereoselective addition of α-lithio N,N-dimethylacetamide to the imine of 2,3-O-cyclohexylidene-4-deoxy-l-threose in the presennce of zinc halide.
A FACILE SYNTHESIS OF CARBOXYLIC ESTERS AND CARBOXAMIDES BY THE USE OF 1,1′-DIMETHYLSTANNOCENE AS A CONDENSING REAGENT
Authors: Mukaiyama Teruaki , Ichikawa Junji , Asami Masatoshi 
Published: July 2006

Abstract
Various carboxylic esters or carboxamides are prepared in good yields under nearly neutral conditions from equimolar amounts of free carboxylic acids and alcohols or amines, respectively, by the use of 1,1′-dimethylstannocene as a condensing reagent.
CYCLIZATION MECHANISM OF TRANS-β-MONOCYCLOHOMOFARNESIC ACID AND RELATED COMPOUNDS
Authors: Saito Akira , Matsushita Hajime , Kaneko Hajime 
Published: July 2006

Abstract
Cyclization of trans-β-monocyclohomofarnesic acid and the related compounds was closely examined in order to elucidate the reaction mechanism. It was revealed that the cyclization of trans-β-monocyclohomofarnesic acid proceeds via formation of the cationic intermediate followed by concerted lactonization to give trans-anti-trans norambreinolide stereoselectively.
DISTINCT OBSERVATION OF TWO CONFORMERS OF 7-CYANOCYCLOHEPTATRIENES CONTAINING A t-BUTYL GROUP AT 2- OR 3-POSITION: AN APPROACH TO VALID INTERPRETATION OF NMR SPECTRA OF CYCLOHEPTATRIENE DERIVATIVES
Authors: Takeuchi Ken’ichi , Kitagawa Toshikazu , Senzaki Yoshihide , Okamoto Kunio 
Published: July 2006

Abstract
Introduction of a t-butyl group to the 2- or 3-position of 7-cyanocycloheptatriene facilitates the observation of the two conformers by 1H and 13C NMR at low temperatures. The chemical shift of equatorial H(7) and the equilibrium constant for the ring inversion with respect to 7-cyanocycloheptatriene have been reexamined and corrected.
FUNCTIONAL FLUOROCARBON MICELLES. PHASE SEPARATION AND REACTIVITY CHANGE OF HYDROXAMATE NUCLEOPHILES IN MIXED MICELLES OF HYDROCARBON AND FLUOROCARBON SURFACTANTS
Authors: Ihara Hirotaka , Hashiguchi Yuichi , Kunitake Toyoki 
Published: July 2006

Abstract
The titration behavior of long-chain(hydrocarbon and fluorocarbon) hydroxamic acids in the presence and absence of micellar matrices is influenced by phase separation of hydrocarbon and fluorocarbon species. The same factors operate in the hydrolysis of phenyl esters.
CHEMICAL BEHAVIOR AND PROPERTIES OF TETRAHYDROPYRROLO[3,2-b]PYRROLE
Authors: Satake Kyosuke , Kumagai Tsutomu , Mukai Toshio 
Published: July 2006

Abstract
Upon treating under basic or acidic conditions, tetrahydropyrrolo[3,2-b]pyrrole derivative 3 easily undergoes demethoxycarbonylation or ring-opening reactions affording bicyclic diimine 5 or pyrrole derivatives such as 10 and 12. In addition, dehydrogenation of 3 results in the formation of dihydropyrrolo[3,2-b]pyrrole derivative 13, which shows [4+2] cycloaddition reaction with dimethyl acetylene dicarboxylate to give indole derivative 15.
EFFECT OF ADDED ALKALI SALTS ON THE ACTIVITIES OF SUPPORTED VANADIUM OXIDE CATALYSTS FOR NITRIC OXIDE REDUCTION
Authors: Shikada Tsutomu , Fujimoto Kaoru 
Published: July 2006

Abstract
It was found that the activities of supported vanadium oxide catalysts for nitric oxide reduction with ammonia were promoted by the addition of sodium or lithium salts while they were suppressed by added potassium salts.
NOVEL AND CONVENIENT METHODS FOR THE PREPARATION OF SUBSTITUTED THIOPHENES, THIAZOLES, AND 1,3,4-THIADIAZOLE-2(3H)-THIONES FROM BIFUNCTIONAL SUBSTRATES
Authors: Thomsen I , Pedersen U , Rasmussen P B , Yde B , Andersen T P , Lawesson S-O 
Published: July 2006

Abstract
The reactions of LR (Lawesson’s Reagent) with 4-oxocarboxylic acid derivatives I, N-acyl aminoacid derivatives III, and N-acyl-N′-ethoxycarbonylhydrazines V, smoothly produce substituted thiophenes II, thiazoles IV, and 1,3,4-thiadiazole-2(3H)-thiones VI.
THE FORMATION OF HYDROXYLAMINE BY INSERTION OF THE NH(1Δ) RADICAL INTO THE O–H BOND OF WATER
Authors: Kawai Jun , Tsunashima Shigeru , Sato Shin 
Published: July 2006

Abstract
The photolysis of hydrogen azide was examined in water. The main products were nitrogen and hydroxylamine. Hydroxylamine formed was converted into acetoxime by the reaction with acetone which was added after irradiation. The amount of acetoxime was analyzed with GLC. The results suggest that the NH(1Δ) radical efficiently inserts into the O–H bond of water.
CHEMOSELECTIVE REDUCTION OF CARBOXYLIC ACIDS INTO ALCOHOLS USING N,N-DIMETHYLCHLOROMETHYLENIMINIUM CHLORIDE AND SODIUM BOROHYDRIDE
Authors: Fujisawa Tamotsu , Mori Toshiki , Sato Toshio 
Published: July 2006

Abstract
A new method for the direct conversion of carboxylic acids to alcohols using N,N-dimethylchloroimethyleniminium chloride and sodium borohydride was established. This method fulfills the chemoselective reduction of carboxylic acids with a functional moiety such as halide, ester, nitrile, and olefin.
TEMPERATURE-DEPENDENCY OF DIASTEREOSELECTIVITY IN THE ALDOL REACTION OF TRIBUTYLSTANNYL ENOLATES WITH BENZALDEHYDE
Authors: Kobayashi Kazuko , Kawanisi Mituyosi , Hitomi Torazô , Kozima Sinpei 
Published: July 2006

Abstract
At −50°C the O-stannyl enolate reacts with benzaldehyde more quickly than the corresponding C-stannyl derivative to give predominantly threo adduct, which slowly isomerizes into the erythro isomer on warming the reaction products. At r.t. the stannyl enolate reacts rapidly to yield the erythro product.
UNEQUIVOCAL SYNTHESIS OF PHENACYLIDENEANILINE FROM SILYL ENOL ETHERS AND NITROSOBENZENE AND ONE-POT CYCLOADDITION REACTIONS OF THE RELATED ANILS
Authors: Sasaki Tadashi , Ishibashi Yukio , Ohno Masatomi 
Published: July 2006

Abstract
Phenacylideneaniline was formed by Et3N-catalyzed elimination reaction of the hydroxylamine obtained from silyl enol ether 5a and nitrosobenzene (6). By this method, one-pot procedure was possible for cycloaddition reactions of the related anils. From these reactions, it was revealed that 6 reacted efficiently with a silyl enol ether having a π-donating substituent.
TOTAL SYNTHESIS OF (±)-AVENACIOLIDE VIA THE β-VINYLBUTENOLIDE ANNULATION
Authors: Kido Fusao , Tooyama Youichi , Noda Yoshihiro , Yoshikoshi Akira 
Published: July 2006

Abstract
Annulation reaction of α-formylcaprylate (5) with 2,5-dihydro-3-phenylthio-4-vinylfuran-2-one (2), followed by dehydration, oxidation, and rearrangement, provided an epimeric mixture of 2,4,5,6-tetrahydro-6-hexyl-4-hydroxy-6-methoxycarbonylbenzofuran-2-ones (8a and 8b). From both the products, 2,3,3aβ,4,6,6aβ-hexahydro-4β-octylfuro [2,3-c] furan-2,6-dione (4b), the known synthetic precursor of (±)-avenaciolide (1) was obtained.
PREPARATION OF OPTICALLY ACTIVE PHOSPHINE OXIDES BY REGIOSELECTIVE CLEAVAGE OF CYCLIC PHENYLPHOSPHONITE WITH ALKYL HALIDES
Authors: Segi Masahito , Nakamura Yoshiyuki , Nakajima Tadashi , Suga Sohei 
Published: July 2006

Abstract
The Arbuzov reaction of (2S,4S)-4-methyl-2-phenyl-1,3,2-dioxaphosphorinane with various alkyl halides gave the diastereomerically pure phosphinates with regioselective cleavage of the primary carbon–oxygen bond. These phosphinates reacted with Grignard reagents to give optically active phosphine oxides in high optical yields.
INTRA- AND EXTRADIOL OXYGENATIONS OF 3,5-DI-TERT-BUTYLCATECHOL CATALYZED BY BIPYRIDINEPYRIDINEIRON(III) COMPLEX
Authors: Funabiki Takuzo , Mizoguchi Akira , Sugimoto Tsunemi , Yoshida Satohiro 
Published: July 2006

Abstract
Iron(III) complex coordinated by 2,2′-bipyridine and pyridine catalyzes oxygenation of 3,5-di-t-butylcatechol with molecular oxygen to give intra- and extradiol fission products as well as oxidation to give 3,5-di-t-butyl-1,2-benzoquinone. Structures and reactivities of the products have indicated that the oxygenation proceeds by the Hamilton process rather than the dioxetane process.
STRUCTURE OF TRICHODERMAOL, ANTIBACTERIAL SUBSTANCE PRODUCED IN COMBINED CULTURE OF TRICHODERMA SP. WITH FUSARIUM OXYSPORUM OR FUSARIUM SOLANI
Authors: Adachi Takuo , Aoki Hiroo , Osawa Toshihiko , Namiki Mitsuo , Yamane Takashi , Ashida Tamaichi 
Published: July 2006

Abstract
Trichodermaol, an antibacterial substance was isolated from the combined culture of Trichoderma sp. with Fusarium oxysporum or Fusarium solani and the structure was determined by spectroscopic and X-ray crystallographic analyses.
STEREOSELECTIVE SYNTHESIS OF 1,2-CIS-GLYCOFURANOSIDES USING GLYCOFURANOSYL FLUORIDES
Authors: Mukaiyama Teruaki , Hashimoto Yukihiko , Shoda Shin-ichiro 
Published: July 2006

Abstract
1,2-cis-Ribofuranosides are stereoselectively synthesized in high yields by the reaction of β-ribofuranosyl fluoride and alcohols in the presence of stannous chloride and trityl perchlorate. Under similar condition, α-arabinofuranosyl fluoride reacts with cholestanol to give 1,2-cis-arabinofuranoside predominatly.
9,10-DICYANOANTHRACENE-SENSITIZED TWO-ELECTRON OXIDATION OF PHENYLCYCLOPROPANE AND AROMATIC OLEFINS IN THE PRESENCE OF COPPER(II) ION
Authors: Mizuno Kazuhiko , Yoshioka Katsutoshi , Otsuji Yoshio 
Published: July 2006

Abstract
The photooxidation of phenylcyclopropane, styrene, and indene using 9,10-dicyanoanthracene-Cu(BF4)2 sensitizer system in acetonitrile-alcohol(3:1) solutions affords the corresponding 1,3-dialkoxy and 1,2-dialkoxy compounds.
COLLOIDAL NOBLE METAL CATALYSTS SUPPORTED ON INORGANIC CARRIERS
Authors: Nakao Yukimichi , Kaeriyama Kyoji 
Published: July 2006

Abstract
Hydrosols of rhodium, palladium, and platinum were prepared by the NaBH4-reduction of the corresponding metal salts in aqueous solution without using protective agents. Colloidal metals in the hydrosols were effectively adsorbed on inorganic carriers such as Mg(OH)2, to give highly active catalysts for olefin hydrogenation.
A CONVENIENT METHOD FOR THE PREPARATION OF ENOL ACETATES OF α-KETO ESTERS BY THE ALKYLATION OF CYANOHYDRIN SILYL ETHERS DERIVED FROM GLYOXYLIC ESTERS WITH BENZYL AND ALLYL HALIDES
Authors: Mukaiyama Teruaki , Oriyama Takeshi , Murakami Masahiro 
Published: July 2006

Abstract
Cyanohydrin silyl ethers, prepared by trimethylsilylcyanation of glyoxylic esters, smoothly react with LDA (lithium diisopropylamide) to yield the lithium salts, which in turn react with alkyl halides such as allyl bromide to give, after acetylation, the corresponding enol acetates of α-keto esters in good yields.
ACETOXYLATION OF PIPERIDINE DERIVATIVES AT THE 3-POSITION. STEREOSELECTIVE SYNTHESIS OF PSEUDOCONHYDRINE AND N-METHYLPSEUDOCONHYDRINE
Authors: Shono Tatsuya , Matsumura Yoshihiro , Onomura Osamu , Kanazawa Takenobu , Habuka Masahiro 
Published: July 2006

Abstract
Anodic oxidation of N-methoxycarbonylpiperidine derivatives in AcOH gave 2,3-diacetoxylated products, which were shown to be useful intermediates for the stereoselective synthesis of 3-hydroxypiperidine derivatives including pseudoconhydrine and N-methylpseudoconhydrine, the Conium alkaloids.
GENERAL METHOD OF STEREOSPECIFIC SYNTHESIS OF NATURAL POLYPRENOLS. SYNTHESIS OF BETULAPRENOL-6, -7, -8, AND -9
Authors: Sato Kikumasa , Miyamoto Osamu , Inoue Seiichi , Furusawa Fumio , Matsuhashi Yasusuke 
Published: July 2006

Abstract
A stereoselective synthesis of (Z,Z,Z)-12-benzyloxy-1-chloro-2,6,10-trimethyldodeca-2,6,10-triene (3) was achieved starting from (Z,Z)-farnesol. All the components of betulaprenols were synthesized using the C15 block 3 and its lower homologue (C10 block) as the key building blocks for the cisoid polyprenyl skeletone.
N-(TRIMETHYLSILYLMETHYL)AMINOMETHYL ETHERS AS AZOMETHINE YLIDE SYNTHONS. A NEW AND CONVENIENT ACCESS TO PYRROLIDINE DERIVATIVES
Authors: Hosomi Akira , Sakata Yasuyuki , Sakurai Hideki 
Published: July 2006

Abstract
The title compounds, readily prepared from (trimethylsilylmethyl)amines, formaldehyde and an alcohol, react with electron deficient alkenes in the presence of iodosilane or silyl triflate in combination with cesium fluoride to give the corresponding pyrrolidine derivatives stereospecifically in excellent yield.
SYNTHESIS OF cis- AND trans-2,6-DIALKYLATED PIPERIDINES THROUGH HIGHLY REGIOSELECTIVE α-ALKYNYLATION OF PYRIDINIUM SALTS AND ITS APPLICATION TO SYNTHESIS OF (±)-SOLENOPSINE A
Authors: Nakazono Yutaka , Yamaguchi Ryohei , Kawanisi Mituyosi 
Published: July 2006

Abstract
Reactions of N-methoxycarbonyl-2-alkylpyridinium salts with alkynyl Grignard reagents give exclusively 2,6-disubstituted 1,2-dihydropyridines, from which cis- and trans-2,6-dialkylated piperidines can be derived selectively. Consequently, (±)-solenopsine A is efficiently synthesized by this sequence.
A CONVENIENT METHOD FOR THE TRANSFORMATION OF ALCOHOLS TO ALKYL CHLORIDES USING N,N-DIPHENYLCHLOROPHENYLMETHYLENIMINIUM CHLORIDE
Authors: Fujisawa Tamotsu , Iida Sachio , Sato Toshio 
Published: July 2006

Abstract
N,N-Diphenylchlorophenylmethyleniminium chloride reacts smoothly with a variety of alcohols in the presence of triethylamine to afford the corresponding alkyl chlorides in high yields. Replacement of a hydroxyl group at an asymmetric carbon atom with chlorine proceeds with complete inversion.
POLY(VINYL CHLORIDE)/AZOBENZENE-LINKED BIS(15-CROWN-5) MEMBRANES. PHOTOINDUCED POTENTIAL CHANGES ACROSS ASYMMETRIC MEMBRANES
Authors: Anzai Jun-ichi , Sasaki Hiroshi , Ueno Akihiko , Osa Tetsuo 
Published: July 2006

Abstract
An azobenzene-linked bis(15-crown-5) (1) was entrapped in the plasticized poly(vinyl chloride) (PVC) membranes in order to regulate their membrane potential by photoirradiation. The membrane potential changed synchronously with trans-cis isomerization of 1 by UV and visible light irradiation even when no concentration gradient of electrolyte existed between the two external solutions separated by the membrane. The results were explicated in terms of the formation of asymmetric membranes, i.e., the surface potential of the irradiated side of the membrane was different from that of the opposite side.
BIS-(N,N-DIALKYLAMINO)-ALKOXYPHOSPHINES AS A NEW CLASS OF PHOSPHITE COUPLING AGENT FOR THE SYNTHESIS OF OLIGONUCLEOTIDES
Authors: Lee Hyun-Jae , Moon Sung-Hwan 
Published: July 2006

Abstract
A new class of bifunctional phosphitylating agent which is stable but readily activatable for the efficient synthesis of oligonucleotides is described.
A MELAMINE/HF-CARBON TETRACHLORIDE LIQUID–LIQUID TWO-PHASE MIXTURE. A HIGHLY VERSATILE HYDROFLUORINATING AGENT FOR ALKENES TO FACILITATE CONTINUOUS OPERATIONS
Authors: Yoneda Norihiko , Nagata Seiji , Fukuhara Tsuyoshi , Suzuki Akira 
Published: July 2006

Abstract
A melamine/hydrogen fluoride-pentane or carbon tetrachloride liquid–liquid two phase mixture has been found to be a highly convenient hydrofluorinating agent for alkenes and a suitable system for the repeated use.
STERICALLY HINDERED FERREDOXIN COMPLEXES AS A MODEL OF HIGH POTENTIAL IRON-SULFUR PROTEINS
Authors: Ueyama Norikazu , Terakawa Toshistugu , Sugawara Takashi , Fuji Michiaki , Nakamura Akira 
Published: July 2006

Abstract
4Fe-4S ferredoxin model complexes, [NEt4]2[Fe4S4(Z-cys-Ile-Ala-OMe)4], [N(n-Bu)4]2[Fe4S4(2,4,6-trimethylbenezenethiolato)4], and [NMe4]2[Fe4S4(2,4,6-triisopropylbenzenethiolato)4] having highly sterically hindered ligands exhibit an electrochemically quasi-reversible redox couple of 2-/1- at +0.12 V, +0.02 V, and −0.03 V vs. SCE, respectively, but an irreversible redox couple of 3-/2-. The results suggest that [Fe4S4(SR)4]1− is stabilized with protection by hydrophobic bulkiness, but that [Fe4S4(SR)4]3− is destabilized by the bulkiness.
ORGANIC SOLAR CELL FABRICATION USING QUINACRIDONE PIGMENTS
Authors: Tomida Masahito , Kusabayashi Shigekazu , Yokoyama Masaaki 
Published: July 2006

Abstract
The photovoltaic characteristics of quinacridone pigments dispersed in the polymer binder in the Schottky type solar cells are reported. The relatively high power conversion efficiency of 0.34% has been obtained at 550 nm and 200 μW·cm−2 with a light exponent of 0.6–0.7 for the short circuit photocurrent.
GLUCOAMYLASE IMMOBILIZED IN POLYSTYRENE FILM
Authors: Makino Keisuke , Tanigami Hajime , Takeuchi Tamio 
Published: July 2006

Abstract
Glucoamylase was immobilized in a polystyrene film by the method where the enzyme was suspended in benzene containing polystyrene and subsequently the mixture was casted on a glass board to make a film. The activity of the enzyme for soluble starch was found to be maintained through the immobilization.