bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNTHESIS OF 15,17-METHYLENE-PROSTAGLANDINS
Authors: Niwa Haruki , Kurono Masayasu
Published: July 2006

20-Methyl-15,17-methylene-prostaglandin F2α and E2 methyl ester (1 and 2) and 15,17-methylene-17-phenoxy-ω-trinor-prostaglandin F2α methyl ester (3) were synthesized via pyrolysis of β-hydroxy sulfoxides obtained by the coupling reaction of 3,7-dioxy-6-phenylsulfinylmethyl-2-oxabicyclo-[3,3,0]-octane derivative (10) with 3-butylcyclobutanone and 3-phenoxycyclobutanone respectively.
CARBON-13 NUCLEAR MAGNETIC RESONANCE SPECTRUM OF COLCHICINE: A REASSIGNMENT
Authors: Blade-Font Artur , Muller Robert , Elguero José , Faure Robert , Vincent Emile-Jean
Published: July 2006

A new NMR signal assignment of the twenty-two carbon atoms of colchicine is proposed that differs considerably from that of Singh, Palmar, Stenberg and Farnum [Spectroscopy Letters, 10, 1001 (1977)]. Some reasons of those discrepancies are analyzed.
BIOSYNTHESIS OF MONOTERPENOIDS IN HIGHER PLANTS. LOCALIZATION OF RADIOACTIVITY IN FAVOR OF THE ISOPENTENYL PYROPHOSPHATE-DERIVED MOIETY OF MONOTERPENOIDS IN THE UPTAKE OF ALANINE-2-14C
Authors: Tange Keiji , Hirata Toshifumi , Suga Takayuki
Published: July 2006

Uptake of Dl-alanine-2-14C to the twigs of Cinnamomum Camphora Sieb. and Pelargonium roseum Bourbon resulted in the preferential location of radioactivity on the isopentenyl pyrophosphate-derived moiety of linalool, geraniol, and citronellol, in opposition to incorporations of leucine and valine into these monoterpenoids. The biosynthetic pathway of the monoterpenoids from the amino acid is discussed.
ANODIC CHLORINATION AND BROMINATION OF 3-SUBSTITUTED SYDNONE COMPOUNDS
Authors: Tien Hsien-Ju , Nonaka Tsutomu , Sekine Taro
Published: July 2006

Anodic halogenation of 3-substituted sydnones was investigated using a platinum electrode in methanol containing halide ions from a synthetic aspect. The chlorination as well as the bromination did take place at the 4-position of sydnones in high yields rather than those in chemical procedures, while the fluorination and the iodination were unsuccessful.
SEVEN-MEMBERED HETEROCYCLES FROM F-2-METHYL-2-PENTENE AND ORTHO-BIFUNCTIONAL BENZENES
Authors: Maruta Masamichi , Kitazume Tomoya , Kubota Satoshi , Yoshimura Narihiko , Ishikawa Nobuo
Published: July 2006

4-Fluoro-2-(F-ethyl)-3-(F-methyl)-1,5-benzoxazepine (2) was prepared by a simple reaction of F-2-methyl-2-pentene (1) with 2-aminophenol in the presence of triethylamine in diethyl ether. Catechol and o-phenylenediamine similarly reacted with 1 to give corresponding seven-membered heterocyles, i.e., 1,5-benzodioxepin and 1,5-benzodiazepin-2-one derivatives, respectively.
PARTIAL ASYMMETRIC TRANSFORMATION OF RACEMIC AMINO ACIDS USING COBALT(III) SCHIFF BASE COMPLEX OF l-MENTHYL β-(2-HYDROXYBENZOYL)PROPIONATE
Authors: Numata Yoshihiko , Okawa Hisashi , Kida Sigeo
Published: July 2006

Cobalt(III) complexes, [Co (l-mop=aa)2]−, where H2(l-mop=aa) denotes Schiff bases obtained from l-menthyl β-(2-hydroxybenzoyl)propionate and an amino acid (aa=gly, ala, val, leu), were prepared in solution and examined with absorption and circular dichroism spectra. It was shown that an asymmetry around the cobalt(III) was induced by the vicinal effect of l-menthyl group and that racemic amino acids were partially transformed to an optical isomer.
TOTAL SYNTHESIS OF RACEMIC FRULLANOLIDE
Authors: Kido Fusao , Maruta Riichiro , Tsutsumi Kentaro , Yoshikoshi Akira
Published: July 2006

2,4,5,5a,6,7,8,9a,9bα-Decahydro-9aβ-hydroxy-5aβ-methoxycarbonyl-9β-methyl-2-oxo-naphtho[1,2-b]furan, the major annulation product from 4-vinylfuran-2(5H)-one and 2-methoxycarbonyl-6-methylcyclohexanone, was transformed into racemic frullanolide.
THE COBALT CATALYZED REDUCTIONS USING CARBON MONOXIDE AND WATER. THE N-ALKYLATION OF MORPHOLINE BY CARBONYL COMPOUNDS
Authors: Sugi Yoshihiro , Matsuda Akio , Bando Ken-ichiro , Murata Kazuhisa
Published: July 2006

The cobalt carbonyl complex modified by α, ω-bis(diphenylphosphino) alkane (PCnP, n=2 or 3) was an effective catalyst for the N-alkylation of morpholine by carbonyl compounds, in which carbon monoxide and water were used in place of hydrogen. N-Methyl, N-isopropyl, and N-benzylmorpholines were obtained in excellent yields.
INDUCED CIRCULAR DICHROISM OF SUBSTITUTED BENZOPHENONES BY COMPLEXATION WITH CHIRAL CROWN ETHERS
Authors: Kaneko Osamu , Matsuura Norio , Kimura Keiichi , Shono Toshiyuki
Published: July 2006

Enhanced induced circular dichroism (ICD) was observed, using ionic benzophenone derivatives as guests and crown compounds containing chiral moieties as hosts. The strength of the ICD spectra was found to depend highly on the solvent polarity and temperature. In methanol–water mixtures the formation constant of crown complexes could be evaluated by the measurement of the ICD.
CROSSED ALDOL REACTION MEDIATED BY DIETHYLALUMINUM 2,2,6,6-TETRAMETHYLPIPERIDIDE (DATMP)
Authors: Nozaki Hitosi , Oshima Koichiro , Takai Kazuhiko , Ozawa Shuji
Published: July 2006

An efficient way of producing organoaluminum enolates of t-butyl acetate and of ketones is based on the title aluminum amide. Subsequent addition to a carbonyl moiety of various substrates affords the desired aldol adducts in fair to excellent yields.
A CONVENIENT SYNTHESIS OF 4-METHYL-2H-1-BENZOTHIOPYRAN-2-ONES (4-METHYLTHIOCOUMARINS)
Authors: Nakazumi Hiroyuki , Asada Akira , Kitao Teijiro
Published: July 2006

4-Methyl-2H-1-benzothiopyran-2-ones (4-methylthiocoumarins) were conveniently prepared by the reaction of S-phenyl 3-oxobutanethioates with aluminium chloride. The spectral characteristics of these compounds were summarized.
NEW SYNTHESIS OF SPIRO DIACYLOXYPHOSPHORANES
Authors: Kobayashi Shiro , Kobayashi Takatoshi , Saegusa Takeo
Published: July 2006

Spiro diacyloxyphosphorarnes (4) and (5) were prepared by single-step reactions of a cyclic acyl phosphonite (1) with α-keto acids (2) and with acrylic acid (3) or β-propiolactone.
M\ddotOSSBAUER SPECTRA OF IRON(II) HYDRIDE COMPLEXES WITH 1,2-BIS(DIPHENYLPHOSPHINO)ETHANE
Authors: Mori Gorô , Takashima Yoshimasa
Published: July 2006

Mössbauer parameters, δ and ΔE, for the known series of complexes, [FeHL(dppe)2][BPH4](dppe=1,2-bis(diphenylphosphino)ethane; L=CO, PhCH2NC, P(OMe)3, N2, etc.), and a new series of complexes, [FeHX(dppe)2] (X=CN−, NO2−, NCS−, NCO−, Cl−, etc.), were obtained. From these data in combination with i.r. data, the bonding properties of the ligands L and X are discussed.
SYNTHESIS OF 2,4-DIMETHYLHEPTALENE-3,8-DIONE
Authors: Kato Kazuo , Oda Mitsunori , Kuroda Shigeyasu , Morita Noboru , Asao Toyonobu
Published: July 2006

Title compound (5) has been synthesized starting from [4,5-c]furotropone, and its physical properties were discussed in connection with heptalenium cations.
NEW DETERMINATION METHOD OF RADON-220 IN MINERAL SPRINGS BY EXTRACTION-LIQUID SCINTILLATION COUNTER
Authors: Horiuchi Kimiko , Murakami Yukio
Published: July 2006

220Rn in mineral springs was extracted into toluene. The α and β or γ rays spectra of 220Rn and its descendants in toluene were measured by LSC or γ spectrometer and the establishment of equilibrium between 212Pb and its descendants was confirmed. Based on this fact a new determination method of 220Rn is developed, consisting of the extraction of radon and the application of integral counting with LSC to 212Pb in radioactive equilibrium with the descendants.
A RELATIONSHIP BETWEEN MASS SPECTRA AND ELECTRON DENSITY
Authors: Nakashima Hiroshi , Okamoto Katsunobu
Published: July 2006

A correlation between the bond scission in mass spectra and the change of electron density on the skeletal bonds from molecules to molecular ions was examined, and it showed that the scission probability of the bond was closely related to the decrease of electron density forming the bonds. This method was applied to several alkylamines.
THE HYDROLYSIS OF p-NITROPHENYL ESTERS OF α-AMINO ACIDS BY N-LAUROYL l OR d-HISTIDINE IN CATIONIC MICELLES
Authors: Yamada Kimiho , Shosenji Hideto , Ihara Hirotaka
Published: July 2006

In order to investigate the enantioselectivity of enzyme-catalyzed reactions the hydrolysis of l and d-SEP were carried out using optically active catalyst, l and d-LauHis, in the presence of the mixed micelles with an optically active surfactant, l-TALAI, or inactive surfactant, CTABr. The enantiometric rate ratios of 1.5–1.6 were obtained in these systems with both surfactants.
ASYMMETRIC HYDROGENATION OF α-ACYLAMINOCINNAMIC ACID CATALYZED BY CHIRAL RHODIUM COMPLEXES. REMARKABLE EFFECTS OF HYDROGEN PRESSURE ON STEREOSELECTIVITY
Authors: Ojima Iwao , Kogure Tetsuo , Yoda Noriko
Published: July 2006

Remarkable effects of hydrogen pressure on the stereoselectivity were observed in the asymmetric hydrogenation of α-acylaminocinnamic acid and its derivatives catalyzed by chiral rhodium complexes. Effects of added triethylamine on the pressure dependency of stereoselectivity was also studied. Possible mechanisms are proposed.
OLIGOMER CATALYST. SPECIFIC OXIDATION OF PHENOLS CATALYZED BY OCTAMERIC OLIGO[1-(N-PHENYLCARBAMOYL)-AZIRIDINE]–COPPER COMPLEX
Authors: Maruyama Kazuhiro , Tsukube Hiroshi , Araki Takeo
Published: July 2006

Oxygen-oxidation of 2,6-xylenol, catalyzed by new type of oligomer complex from copper salt and octameric oligo[1-(N-phenylcarbamoyl)aziridine] and its thio-analog, gives C–O coupling product in reasonable yield without forming C–C coupling product. This oligomer catalyst system was extended to the oxidation of several phenols such as 2,6-dimethoxyphenol, 2,6-di-t-butylphenol, 2,4-xylenol, and so on.
5-CHLORO-8-QUINOLYL GROUP AS A PROTECTING GROUP ON PHOSPHOMONOESTERS IN THE SYNTHESIS OF OLIGONUCLEOTIDES
Authors: Takaku Hiroshi , Yamaguchi Ryuichi , Hata Tsujiaki
Published: July 2006

5-Chloro-8-quinolyl group (ClQ) has been used as a protecting group of phosphate in the synthesis of oligonucleotides. This group was selectively and smoothly removed by treatment with zinc chloride in aqueous pyridine at room temperature for 12 hr.
REGIOSELECTIVE HYDROXYLATION OF β-MYRCENE USING Pd(II) COMPLEXES
Authors: Takahashi Mitsuru , Suzuki Hiroharu , Moro-oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

O-nucleophiles, RO−(R = H, Et, i-Pr, and Ac) were introduced regioselectively into the terminal position of β-myrcene to form linear π-allylpalladium complexes, 2 using HMPA as solvent. Decomposition of 2a gave nerol and citral selectively.
BENZO[4,5]CYCLOHEPT[1,2,3-bc]ACENAPHTHYLENE AND BENZO[a]NAPHTH[3,4,4a,5-cde]AZULENE. NONALTERNANT ISOMERS OF BENZO[a]PYRENE
Authors: Todo Eishiro , Yamamoto Kagetoshi , Murata Ichiro
Published: July 2006

In order to examine the biological activities of the nonalternant isomers of potent carcinogen benzo[a]pyrene, benzo[4,5]cyclohept[1,2,3-bc]acenaphthylene (2) and benzo[a]naphth[3,4,4a,5-cde]azulene (3), were synthesized. Some properties of 2 and 3 were also described.
ENANTIOSELECTIVE REDUCTION OF KETONES WITH (+)-(1R,4S)-3-EXO-ANILINO-2-EXO-HYDROXYBORNANE-LITHIUM ALUMINIUM HYDRIDE COMPLEX
Authors: Saigo Kazuhiko , Yamamoto Masao , Morimura Kazuo , Nohira Hiroyuki
Published: July 2006

(+)-(1R,4S)-3-Exo-anilino-2-exo-hydroxybornane (1) was synthesized in moderate yield in three steps from commercially available (+)-camphor. Asymmetric reduction of prochiral ketones such as acetophenone, propiophenone, and butyrophenone with the chiral hydride reagent prepared from 1 and lithium aluminium hydride gave optically active alcohols having the R-configuration in 26–43% e.e.
PHOTOCHEMICAL HYDROGEN EVOLUTION FROM BENZENETHIOL CATALYZED BY BENZENETHIOLATOBIS(DIMETHYLGLYOXIMATO)COBALT (III)
Authors: Oishi Shigero , Nozaki Keiko
Published: July 2006

Molecular hydrogen was produced catalytically by visible light irradiation of the acetonitrile solution containing benzenethiolatopyridinebis(dimethylglyoximato)cobalt(III) and benzenethiol. Some thioketones were found to photosensitize the reaction effectively.
STUDIES ON THE ADDUCTS OF SULFUR DIOXIDE WITH VITAMIN D
Authors: Yamada Sachiko , Takayama Hiroaki
Published: July 2006

Vitamin D2 reacted rapidly with liquid sulfur dioxide at the Δ5,10(19)-diene part to give the α and the β-face adducts in about 1:1 ratio. Both adducts extruded sulfur dioxide by thermolysis to give 5,6-trans vitamin D2 in good yield together with a trace of vitamin D2. Similar reactions were examined for vitamin D3 and trans vitamin D2.
SEPARATION OF BARIUM(II) FROM STRONTIUM(II) BY MEANS OF THE SOLVENT EXTRACTION WITH DIBENZO-24-CROWN-8
Authors: Takeda Yasuyuki , Oshio Keiichi , Segawa Yoshio
Published: July 2006

Barium(II) (3.00×10−4 M) was easily separated from strontium(II) (3.00×10−4–1.70×10−2 M) by means of the solvent extraction procedure with a nitrobenzene solution of dibenzo-24-crown-8. Average recovery of barium(II) was 97% and only 10−3 part of the strontium(II) in the initial sample solution was recovered.
COUPLING REACTIONS OF ORGANOALUMINATES WITH ACID CHLORIDES OR ANHYDRIDES CATALYZED BY COPPER COMPOUNDS. A CONVENIENT ROUTE TO KETONES FROM 1-OLEFINS VIA HYDROALUMINATION
Authors: Sato Fumie , Kodama Hiroyuki , Tomuro Yasuji , Sato Masao
Published: July 2006

Hydroalumination of 1-olefins with lithium aluminum hydride followed by treatment with acid chlorides or anhydrides in the presence of a catalytic amount of copper(I) chloride resulted in coupling. This new development provides a simple and general method for the synthesis of ketones.
PHOTODECOMPOSITION OF ISOPROPOXIDE ADSORBED ON POROUS VYCOR GLASS
Authors: Yun Chebock , Anpo Masakazu , Kubokawa Yutaka
Published: July 2006

Photoenhancement of the propene formation from the isopropoxide on porous Vycor glass is attributed to O− hole centers formed by the charge transfer process at low co-ordination sites, which gives rise to the absorption around 250 nm as well as the emission at 400 nm.
THE REACTION OF LITHIATED 2-ALLYLOXYBENZIMIDAZOLES WITH ALKYL HALIDES
Authors: Mukaiyama Teruaki , Yamaguchi Masahiko
Published: July 2006

The treatment of 2-allyloxybenzimidazoles, derived from allyl alcohols and 2-chlorobenzimidazoles, with butyllithium generates the oxy allylic anions, which in turn were alkylated predominantly at α-carbon with alkyl halides to form allyl ethers as major products.
THE SYNTHESIS OF 6,7-DIDEHYDRO-5-HYDROXY AND 4,5-DIDEHYDRO-6-HYDROXYPROSTAGLANDIN F1α : PHOTOSENSITIZED OXYGENATION OF PROSTAGLANDIN F2α
Authors: Nishiyama Hisao , Ohno Kiyotaka
Published: July 2006

Photosensitized oxygenation of prostaglandin F2α methyl ester was studied to prepare 6,7-didehydro-5-hydroxy and 4,5-didehydro-6-hydroxyprostaglandin F1α methyl ester. 6,7-Didehydro-5β-hydroxyprostaglandin F1α is interesting from the viewpoints of structure-activity relationships, because the two side chains of it have the symmetrical allylic alcohol structure.
CHANGES IN THE CATALYTIC PROPERTIES CAUSED BY THE CRYSTALLIZATION OF A VANADATE GLASS ON THE DECOMPOSITION OF FORMIC ACID
Authors: Yoshida Noritetsu , Kazehara Kenya , Kawamoto Yoji , Kishimoto Shozo
Published: July 2006

The difference in the catalytic activity between vitreous and crystalline state of a vanadate (V2O5–BaO–ZnO) was observed for the decomposition of formic acid. The results suggested that the surface net work structure formed by V2O5 is extremely inactive in the dehydration in comparison with the surface in the crystallized state.
THE SYNTHESIS OF l-NOGALOSE
Authors: Yoshimura Juji , Hong Namgi , Funabashi Masuo
Published: July 2006

l-Nogalose (1: 6-deoxy-3-c-methyl-2,3,4-tri-o-methyl-l-mannopyranose), the sugar component of antibiotic nogalamycin, has been synthesized from l-rhamnose. The c-methyl branching was introduced by successive epoxidation and reduction of methyl 3,6-dideoxy-2,4-di-o-methyl-3-c-methylene-α-l-arabino-hexopyranoside.
CHARGE DISTRIBUTION IN ELECTRIC DOUBLE LAYER ON POLYSTYRENE LATTICES
Authors: Furusawa Kunio , Kawai Hiroshi
Published: July 2006

Conductometric titration curves using some bases give important knowledge about the structure of the electric double layer on the surface of polystyrene lattices. This analysis showed that the Stern layer charge increases with an increase in the surface charge of latex(δO) and at about the same rate as δO does, reaching a virtually constant diffuse-layer charge.
SYNTHETIC CONTROL BY INTERNAL COORDINATION OF METAL SALTS THE INTRAMOLECULAR DIELS-ALDER REACTIONS OF N-FURFURYL-N-(2-HYDROXYPHENYL)ACRYLAMIDES
Authors: Mukaiyama Teruaki , Tsuji Takashi , Iwasawa Nobuharu
Published: July 2006

An efficient method for acceleration of the intramolecular Diels–Alder reactions was established. The magnesium salts of N-furfuryl-N-(2-hydroxyphenyl)acrylamides, including a sterically hindered β,β-dimethylacrylamide derivative, afforded the corresponding cycloadducts in good yields.
A SIMPLE SYNTHESIS OF 2,4-DIENALS FROM 1-TRIMETHYLSILYL-1,3-DIENES
Authors: Yamamoto Keiji , Ohta Mitsuaki , Tsuji Jiro
Published: July 2006

Reaction of 1-trimethylsilyl-1,3-dienes with dichloromethyl methyl ether in the presence of titanium(IV) chloride afforded, after hydrolysis, 2,4-dienals in good yields. Convenient preparative route to the 1-trimethylsilyl-1,3-dienes starting from allylsilanes was also described.
MUTUAL SOLUBILITY IN MIXED MICELLES OF FLUOROCARBON AND HYDROCARBON SURFACTANTS FROM SURFACE TENSION DATA
Authors: Funasaki Noriaki , Hada Sakae
Published: July 2006

The mutual solubility in mixed micelles of fluorocarbon and hydrocarbon surfactants was determined by surface tension measurements, as convincing evidence for the partial miscibility postulated by Mukerjee and Yang.
REACTION AND ACTIVATION VOLUMES FOR THE 1,4-CYCLOADDITION OF TETRACYANOETHYLENE TO α-METHYLSTYRENE IN 1,2-DICHLOROETHANE AT 25°C
Authors: Uosaki Yasuhiro , Nakahara Masaru , Sasaki Muneo , Osugi Jiro
Published: July 2006

The charge–transfer spectrum of tetracyanoethylene with α-methylstyrene in 1,2-dichloroethane at 25°C has been measured at high pressures up to 1500 bar. Volume changes associated with the charge–transfer complex formation and the 1,4-cycloaddition at 1 bar are −6.9±0.6 and −29.2±0.7 cm3 mol−1, respectively.
ANGULAR HYDROXYLATION OF POLYCYCLIC KETONES USING BENZENESELENINIC ANHYDRIDE
Authors: Yamakawa Koji , Satoh Tsuyoshi , Ohba Nobuyuki , Sakaguchi Reiji
Published: July 2006

Introduction of a hydroxyl group into the angular position of tricyclic ketones (1, 4a, 4b, and 6) was accomplished by the use of benzeneseleninic anhydride, the products being obtained in a good yield.
SELECTIVE ISOMERIZATION OF 2,5-DIENONES TO 2,4-DIENONES WITH NICKEL ACETYLACETONATE CATALYST
Authors: Onishi Takashi , Fujita Yoshiji , Nishida Takashi
Published: July 2006

Double bond migration of 2,5-dienones 3 to 2,4-dienones 2 (e.g. pseudoionone) was effectively carried out by using nickel acetylacetonate catalyst in N-methyl-2-pyrrolidone solvent.
MICROWAVE SPECTRA OF TRANS-METHYL(SILYLMETHYL)ETHER
Authors: Shiki Yoshiko , Oyamada Mikiya , Hayashi Michiro
Published: July 2006

Molecular structure and dipole moment of trans-methyl(silylmethyl) ether were obtained from the observed microwave spectra of the normal and three deuterated species. From the splittings of the spectra for the normal and SiH3CD2OCH3 species, the barrier to internal rotation of the SiH3 or CH3 group was discussed.
PREPARATION AND REACTIONS OF 2-SUBSTITUTED 3-TRIMETHYLSILYL-4-EN-1-ONE SYSTEM
Authors: Kuwajima Isao , Tanaka Toshihiko , Atsumi Kunio
Published: July 2006

Various 3-trimethylsilyl-4-en-1-one types of compounds have been prepared by using 3-trimethylsilylallyl alcohol. Some of them can be efficiently converted into the corresponding cyclization products, 3-cyclopenten-1-ols, or dienone types of compounds.
SYNERGISTIC EXTRACTION OF VANADIUM(V) WITH A MIXTURE OF DITHIZONE AND TRIBUTYLPHOSPHINE OXIDE
Authors: Akaiwa Hideo , Kawamoto Hiroshi , Hiyamuta Etsuo
Published: July 2006

By employing the synergistic extraction technique, vanadium(V) has been found to react with dithizone in the presence of tributylphosphine oxide, and the extraction of vanadium(V) clarified to proceed according to the following equation:

HVO3+H2Dz,org+TBPOorg \ightleftharpoonsVO2(HDz)(TBPO)org+H2O

The red colored resulting adduct having an absorption maximum at around 503 nm is stable at least within 1 hour.
CYCLOREVERSION OF TETRAPHENYLCYCLOBUTANE INDUCED BY ELECTRON CAPTURE
Authors: Takamuku Setsuo , Kigawa Hitoshi , Miki Sigeo , Sakurai Hiroshi
Published: July 2006

γ-Radiolysis of tetraphenylcyclobutane(TPCB) in HMPA forms trans-stilbene (t-St) preferentially. The effect of an additive proved that the cycloreversion of TPCB occurs mainly by the reaction of solvated electrons with TPCB. Absorption spectra of γ-irradiated TPCB solution in MTHF show that dissociative electron capture proceeds even at 77K with a predominant steric retention leading to t-St and t-St\ewdot.
IODINE NUCLEAR QUADRUPOLE RESONANCE OF SEVERAL MOLECULAR COMPLEXES OF IODOHYDROCARBONS
Authors: Okuda Tsutomu , Ishihara Hideta , Yamada Koji , Negita Hisao
Published: July 2006

The127 I NQR was observed for the five molecular complexes of iodohydrocarbons such as CHI3, C2I4, and C2I2. The assignments of the resonance lines are made from the temperatures of the disappearance and the temperature coefficients of the relevant lines. It is suggested for CHI3-1,4-dithiane that the atomic orbitals of the iodine atoms are sp3d hybridized to form the charge transfer bonds.
POLYMER EFFECTS ON ELECTRON TRANSPORT SEMSITIZATION: A KINETIC ATTEMPT TO MIMIC THE PRIMARY ACTION OF CHLOROPHYLL
Authors: Tazuke Shigeo , Tomono Haruo , Kitamura Noboru , Sato Kaname , Hayashi Naoya
Published: July 2006

Photooxidation of Leuco Crystal Violet to the dye cation using polymer bound anthryl and pyrenyl groups as electron transport sensitizers showed that all of anthryl polymers were more efficient than their monomer model compound whereas pyrenyl polymers were not. The positive polymer effect was attributed to energy migration along polymer chain to increase the energy utilization efficiency.
CHEMICAL REACTIONS OF o-TROPOQUINONE AND ITS DERIVATIVES
Authors: Hirama Masahiro , Kawamata Akira , Itô Shô
Published: July 2006

Various reactions were carried out with o-tropoquinone and its hydrate and hemiacetal in order to compare their behavior with that of o-benzoquinone and cyclic vicinal triketones. Although many reactions went parallel with the reference compounds, some abnormal reactions, such as reduction to 3-hydroxytropolone under various conditions, change in the reaction mode in Thiele type acetylation depending on the acid concentration and aromatization by BF3, were observed.
HYDROGENATION OF 1,3-BUTADIENE WITH CYCLOHEXADIENES OVER CERIUM OXIDE
Authors: Amaguchi Tsutomu , Shima Hiroshi
Published: July 2006

Cerium oxide, which is not active for H2–D2 equilibration, catalyzes the hydrogenation of 1,3-butadiene using cyclohexadiene as a hydrogen source and gives trans-2-butene almost exclusively. Marked difference in hydrogenating activity was found on cerium oxide between 1,4- and 1,3-cyclohexadienes, the former being much more active than the latter, while there was no difference over MgO.
SYNTHESIS OF BIARYLS FROM ARYL IODIDES AND ZINC POWDER BY MEANS OF NICKEL CATALYST
Authors: Takagi Kentaro , Hayama Naomi , Inokawa Saburo
Published: July 2006

Nickel species in situ generated from nickel(II) bromide and zinc powder in HMPA catalyzed the formation of biaryls from aryl iodides and zinc powder under mild conditions.
VINYLCYCLOPROPANE-CYCLOPENTENE REARRANGEMENT CATALYZED BY NICKEL(0) COMPLEXES
Authors: Murakami Masashi , Nishida Shinya
Published: July 2006

Bis(1,5-cyclooctadiene)nickel-tributylphosphine (1:1) catalyzed the vinylcyclopropane-cyclopentene rearrangement. Only such vinylcyclopropanes as those being capable of complexing with the catalyst (such as 1-substituted 1-cyclopropyl-1,3-butadienes and 1,1-dicyclopropylethylenes) were reactive.
ALUMINIUM HALIDE-THIOL SYSTEM: A USEFUL REAGENT FOR DEMETHYLATION OF ALIPHATIC AND AROMATIC METHYL ETHERS AND DEMETHYLENATION OF METHYLENEDIOXY COMPOUNDS
Authors: Node Manabu , Nishide Kiyoharu , Sai Midori , Ichikawa Kohei , Fuji Kaoru , Fujita Eiichi
Published: July 2006

A new efficient procedure for demethylation of methyl ethers and demethylenation of methylenedioxy compounds under mild conditions has been exploited by the use of aluminium halide-thiol system.
ALLYLATION REACTIONS BY USING ALLYLSTANNANES IN THE PRESENCE OF A LEWIS ACID
Authors: Hosomi Akira , Iguchi Hirokazu , Endo Masahiko , Sakurai Hideki
Published: July 2006

Allylations of various carbon electrophiles such as carbonyl compounds, acetals, and α,β-enones with allylstannanes promoted by bis(diethylaluminum)sulfate or boron trifluoride etherate are described. Merits and demerits of using allylstannanes in syntheses instead of allylsilanes are also discussed.
REDUCTION OF CARBOXYLIC ACIDS TO ALCOHOLS THROUGH 1-SUCCINIMIDYL ESTERS WITH NaBH4
Authors: Nikawa Jun-ichi , Shiba Tetsuo
Published: July 2006

1-Succinimidyl esters of various aliphatic acids and amino acids were reduced with sodium borohydride in tetrahydrofuran to the corresponding alcohols under mild conditions in fairly good yields. The facile reaction offers a convenient method for the preparation of alcohols from carboxylic acids, and can be effectively applied to a selective conversion of an appropriate carboxyl group to a hydroxymethyl group in the presence of other functional groups.
TEMPERATURE DEPENDENCE OF ECL EFFICIENCY OF TRIS(BIPYRIDINE)Ru(II) COMPLEX
Authors: Itoh Kiminori , Honda Kenichi
Published: July 2006

Temperature dependence of ecl efficiency (η) and that of phosphorescence quantum yield(φp) of tris(bipyridine)Ru(II)-acetonitrile system have been investigated. Both η and φp increased with lowering temperature, while the ratio η⁄φp remained nearly constant. The value of η reached ca. 7 % at 0°C. Based on these results the ecl generation mechanism is discussed.
PREPARATION AND CATALYTIC ACTIVITY OF COLLOIDAL NICKEL BORIDE DISPERSED IN ETHANOL
Authors: Nakao Yukimichi , Fujishige Shoei
Published: July 2006

Colloidal nickel borides in ethanol were prepared by the reaction of nickel(II) chloride with sodium borohydride in the presence of a polymer like poly(vinylpyrrolidone). The colloid was effective for the hydrogenation of acrylamide at 30°C under an atmospheric hydrogen pressure.
SYNTHESIS OF A CHIRAL 1,1,3-TRIMETHYLCYCLOHEXANE DERIVATIVE FROM d-CAMPHOR: A POTENT KEY BUILDING BLOCK FOR ENT-TAXANE-TYPE DITERPENOIDS
Authors: Kitagawa Isao , Shibuya Hirotaka , Fujioka Hiromichi , Kajiwara Akiharu , Tsujii Shinji , Yamamoto Yoshio , Takagi Akira
Published: July 2006

A chiarl 1,1,3-trimethylcyclohexane derivative (12), which is a potent key building block for synthesis of ent-taxane-type diterpenoids, has been prepared from d-camphor (2) through a conversion pathway which involves a novel ring enlargement reaction of a 1,1,2-trimethylcyclopentane derivative (3).
A CONCERTED TWO-STEP ACTIVATION OF PHOTOINDUCED ELECTRON-TRANSPORT ACROSS LIPID MEMBRANE
Authors: Matsuo Taku , Itoh Kengo , Takuma Keisuke , Hashimoto Kunitoshi , Nagamura Toshihiko
Published: July 2006

Photosensitized reduction of disodium 9,10-anthraquinonedisulfonate was carried out by the use of vesicles incorporating an amphipathic zinc porphinato complex (ZnC12TPyP) and electron mediators. An extremely rapid electron-transport across the vesicle wall was observed with 1,3-dibutylalloxazine as the electron mediator. Two-step activations of the sensitizer (ZnC12TPyP) at the inner- and outer surfaces of vesicles were suggested to account for the electron-transport.
PHOTOSENSITIZED OXIDATION OF 1-PHENYLCYCLOBUTENE. THE ROLE OF REACTIVE OXYGEN SPECIES OTHER THAN SINGLET OXYGEN
Authors: Sakuragi Masako , Sakuragi Hirochika
Published: July 2006

On dye-sensitized photooxidation of 1-phenylcyclobutene the formation of 3-benzoylpropanal and 2-phenyl-3-hydroperoxycyclobutene was ascribed to oxidation with singlet oxygen, whereas a reactive oxygen species other than singlet oxygen was responsible for the formation of 1-(2-hydroxyphenyl)cyclopropanecarbaldehyde. Some attempts to explore the latter oxygen species were made.
A CESIUM IMMOBILIZATION FROM AN AQUEOUS SOLUTION USING THE CRYSTALLINE ADSORBER OF HYDROUS TITANIUM DIOXIDE FIBERS
Authors: Fujiki Yoshinori , Komatsu Yu , Ohta Nobuhiro
Published: July 2006

The immobilization of Cs+ ions in a CsOH solution was studied by using the adsorber of crystalline TiO2·nH2O fibers. The adsorbed cesium contents were in a compositional range of CsxTi6O12+x⁄2(1.5<x≤2). This cesium titanate was remade to the Cs-priderite(CsxAlxTi8−xO16:1.5<x≤2) of the hollandite structure type by heating after the addition of Al2O3. The most stable immobilizer of Cs+ ions was obtained by sintering the mixed phases of Cs-priderite and rutile.
DEALUMINOXYLATION OF ALUMINUM ALLYL OR BENZYL ALKOXIDES AND DEOXYGENATION OF ALLYL ETHERS BY LITHIUM ALUMINUM HYDRIDE IN THE PRESENCE OF TITANIUM CATALYST
Authors: Sato Fumie , Tomuro Yasuji , Ishikawa Hiroaki , Oikawa Takeshi , Sato Masao
Published: July 2006

Various aluminum allyl and benzyl alkoxides and allyl ethers undergo hydrogenolysis by LiAlH4 in the presence of a catalytic amount of TiCl4 or Cp2TiCl2. Thus, the present reaction provides a convenient method for replacing oxygen-containing functional groups at the allylic or benzylic position by hydrogen.
THREE COMPONENT COMPLEXES OF CYCLOHEPTAAMYLOSE. FLUORESCENCE QUENCHING OF PYRENES AND NAPHTHALENES IN AQUEOUS MEDIA
Authors: Kano Koji , Takenoshita Itsuro , Ogawa Teiichiro
Published: July 2006

Fluorescence quenching of pyrenes and naphthalenes by diethylamine and di-n-butylamine has been measured in aqueous media with and without cycloheptaamylose. Formation of three component complexes of cycloheptaamylose with a fluorophore and a quencher has been indicated from the catalytic effects of cycloheptaamylose on quenching.
STEREOSELECTIVE SYNTHESIS OF (±)-OCCIDENTALOL
Authors: Mizuno Yukio , Tomita Masako , Irie Hiroshi
Published: July 2006

Stereoselective synthesis of the sesquiterpene alcohol, occidentalol starting from methyl c-4,c-9-dimethyl-6-methoxycarbonyl-2,7-dioxo-cis-decalyl-r-8-carboxylate was described.
6,6-DIMETHYL-6-SILAFULVENE. GENERATION AND TRAPPING REACTIONS
Authors: Nakadaira Yasuhiro , Sakaba Hiroyuki , Sakurai Hideki
Published: July 2006

6,6-Dimethyl-6-silafulvene generated from (allyl)(cyclopentadienyl)dimethylsilane reacts with a trapping reagent such as methanol, benzaldehyde, and benzophenone to give (cyclopentadienyl)(methoxy)dimethylsilane, 6-phenylfulvene, and 6,6-diphenylfulvene, respectively. Without a trapping reagent, the silafulvene undergoes dimerization.
1H- AND 13C-NMR OF LOW-SPIN TETRACYANOIRON(III) CHELATES FORMED WITH 1,2-DIAMINES OF FIXED CONFORMATIONS
Authors: Goto Masafumi , Takeshita Michihiro , Sakai Tomoya
Published: July 2006

Well resolved 1H- and 13C-NMR signals of the title compounds were assigned with the aid of change in chemical shift by varying the composition of the mixture of FeII and FeIII complexes of an identical set of ligands. Distinct differences in chemical shift between axial and equatorial protons of the chelate rings and 13C-isotropic shifts alternating in sign with each separation from FeIII center by C–C bond were observed.
SYNTHESIS OF 9,10-BENZOTETRACYCLO[5.3.0.02,4.03,5]DECA-1(7),9-DIEN-6-ONE, A VALENCE ISOMER OF BENZ[a]AZULEN-9(10H)-ONE
Authors: Sugihara Yoshikazu , Sugimura Takashi , Murata Ichiro
Published: July 2006

9,10-Benzotetracyclo[5.3.0.02,4.03,5]deca-1(7),9-dien-6-one (2), a valence isomer of benz[a]azulen-9(10H) -one (3), has been synthesized from 5,6-benzobicyclo [3.2.0] hepten-2-one utilizing the oxa-di-π-methane rearrangement.
FACILE SYNTHESIS OF α-FLUORO-β-KETOESTERS FROM POLYFLUOROALKENES
Authors: Ishikawa Nobuo , Takaoka Akio , Iwakiri Hiroshi , Kubota Satoshi , Kagaruki S R F
Published: July 2006

Alkyl 2-chloro-1,2,2-trifluoroethyl ketones and aryl 1,2,2,2-tetrafluoroethyl ketones were respectively prepared by the Friedel–Crafts acylation of trifluoroethene and by the Grignard arylation of N,N-diethyl-1,2,2,2-tetrafluoropropionamide, a hydrolyzed product of hexafluoropropene–diethylamine adduct. These alkyl and aryl polyfluoroalkyl ketones were subjected to base-induced dehydrohalogenation, and resulting trifluorovinyl ketones were hydrolyzed in situ affording α-fluoro-β-ketoesters in good yields.
TRANSFORMATION OF GRAYANOTOXIN II TETRAACETATE TO A 1,5-SECOGRAYANANE DERIVATIVE
Authors: Terai Tadamasa , Meguri Haruo , Hamanaka Nobuyuki , Matsuzaki Takao , Furusaki Akio , Kato Tsuyoshi , Matsumoto Takeshi
Published: July 2006

Irradiation of grayanotoxin II tetraacetate with UV light in the presence of lead tetraacetate in benzene afforded 1-epi-grayanol A pentaacetate in high yield.
DISTINCTIVE STRUCTURE-REACTIVITY SEQUENCES IN THE TYPE I AND TYPE II CYCLOADDITIONS OF CYCLOPROPYL-SUBSTITUTED ETHYLENE WITH TETRACYANOETHYLENE
Authors: Kataoka Fumio , Nishida Shinya
Published: July 2006

Structure-reactivity sequences of two cycloadditions, distinctive in pattern, between cyclopropylethylene and tetracyanoethylene were totally different. In the type I, a bulky group at C2 decreased the rate of the reaction, whereas, in the type II, bulky alkyls at C2 enhanced the reactivity. The results accommodate to a proposed scheme involving an electron transfer step.
REACTIONS OF SUBSTITUTED PYRIDINIUM N-IMINES WITH BENZYNE: SYNTHESES OF PYRIDO[1,2-b]INDAZOLES AND RELATED COMPOUNDS
Authors: Yamashita Yoshiro , Hayashi Takashi , Masumura Mitsuo
Published: July 2006

Reactions of benzyne with several pyridinium N-imines were examined. 2-o-Aminophenylpyridine derivatives 6, pyrido[1,2-b]indazoles (7), indazolo[2,3-a]quinoline (17), and indazolo[3,2-a]isoquinoline (18) were obtained by the reactions of benzyne with the corresponding ylides 5, 10, 15, and 16, respectively.
SURFACE DESIGN AND CATALYTIC ACTIVITIES OF WELL DEFINED, FIXED “Mo2” CATALYSTS—ACTIVE STRUCTURES FOR C3H6 METATHESIS
Authors: Iwasawa Yasuhiro , Kubo Hideo , Yamagishi Masahiko , Ogasawara Sadao
Published: July 2006

New fixed Mo2 catalysts with “paired” molybdenum species were prepared using Al2O3 and SiO2 find the active structure for C3H6 metathesis and the following order of activity for surface structures was found in comparison with the activities of fixed “single” Mo catalysts;
VENUSTIN A AND B, NEW HALOGENATED C15 METABOLITES FROM THE RED ALGA LAURENCIA VENUSTA YAMADA
Authors: Suzuki Minoru , Kurosawa Etsuro
Published: July 2006

Two new halogenated non-terpenoid C15 compounds, venustin A (1) and B (2), were isolated from the red alga Laurencia venusta Yamada. The structures of these compounds were determined by chemical and spectroscopic evidence.
ISOTHERMAL CHANGE OF THE SPECTRUM OF LOCALIZED ELECTRONS IN GLASSY 1-PROPANOL IRRADIATED AT 4 K
Authors: Ogasawara Masaaki , Shimizu Kunio , Yoshida Hiroshi
Published: July 2006

An isothermal change at 77 K of the absorption spectrum of electron localized at 4 K in glassy 1-propanol revealed the elementary steps responsible for the spectral shift from IR to the visible region: the rapid shift (from 1800 to 1650 nm) and decay of the IR peak were followed by a gradual shift (from 800 to 580 nm) and an increase of the visible peak. The results support the two-trapping site model previously proposed for alcoholic matrices.
PHOTOISOMERIZATION OF NORBORNADIENE TO QUADRICYCLANE IN THE PRESENCE OF COPPER(I)-NITROGEN LIGAND CATALYSTS
Authors: Maruyama Kazuhiro , Terada Kazutoshi , Naruta Yoshinori , Yamamoto Yoshinori
Published: July 2006

Use of copper(I)-nitrogen ligand catalysts, such as Ph3PCuCl.bipy (1), Ph3PCuCl.phen (2), Ph3PCuCl.phtha (3), and Ph3PCuBr.py (4), enables the photochemical isomerization of norbornadiene to quadricyclane in longer wavelength than 350 nm, in which CuCl catalyst itself can not induce such an isomerization.
(E)-γ-BISABOLEN-8,9-EPOXIDE AND ISOCYCLOEUDESMOL, TWO NEW SESQUITERPENOIDS FROM THE MARINE RED ALGA LAURENCIA NIPPONICA YAMADA1)
Authors: Suzuki Teruaki , Kikuchi Hajime , Kurosawa Etsuro
Published: July 2006

Two new sesquiterpenoids, (E)-γ-bisabolen-8,9-epoxide and isocycloeudesmol, have been isolated from L. nipponica Yamada (Rhodophyta, Rhodomelaceae) and their structures have been determined by spectroscopic and chemical evidences.
SURFACE STRUCTURES OF FIXED Cr CATALYSTS AND THEIR CATALYTIC ACTIVITIES FOR CO OXIDATION AND C3H6 HYDROGENATION
Authors: Iwasawa Yasuhiro , Ogasawara Sadao
Published: July 2006

Two types of active fixed Cr catalysts(Al2O3 and SiO2 supports) and surface structures of active sites are reported. Coordinatively unsaturated Cr2+ ions with three vacant positions in the “virgin” fixed catalyst showed a high activity for C3H6 hydrogenation Five-coordinated Cr3+ species with suitably strong exchange interaction between Cr3+ in a Cr3+–O–Cr3+ cluster of the “rearranged” fixed catalyst created by surface reconstruction were found to be active sites for CO oxidation.
HYDROGEN SEPARATION WITH ELECTROCHEMICAL CELL
Authors: Miura Norio , Ozawa Yoshihiro , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

A new technique for hydrogen separation using a short-circuited electrochemical cell constructed by use of a solid electrolyte was described with preliminary experimental data. With phosphomolybdic acid as a proton conductor, a short-circuit current density of 7.4 mA/cm2 or a rate of hydrogen separation of 3.1 cm3/h·cm2-electrode, was attained experimentally.
SYNTHESIS OF PHTHALOCYANINES FROM PHTHALONITRILE WITH ORGANIC STRONG BASES
Authors: Tomoda Haruhiko , Saito Shojiro , Ogawa Shojiro , Shiraishi Shinsaku
Published: July 2006

In the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene or 1,5-diazabicyclo[4.3.0]non-5-ene, metal-free phthalocyanine was obtained by heating phthalonitrile in alcohols. Addition of a copper(II) salt in the reaction gave copper phthalocyanine in a good yield.
THE EXAFS STUDY OF Cu(II) AQUEOUS SOLUTION USING A POSITION SENSITIVE DETECTOR
Authors: Sano Mitsuru , Taniguchi Kazuo , Yamatera Hideo
Published: July 2006

Extended X-ray absorption fine structure (EXAFS) spectroscopy has been applied to the study of an aqueous solution. An X-ray spectrum for 0.32 M Cu(CLO4)2 was measured by a multi-detection apparatus of laboratory scale with a usual X-ray tube and a position-sensitive detector and analyzed preliminarily by Fourier transformation method to give the Cu–O distances of 1.94 and 2.46 Å (assuming α = 0.39 Å), in agreement with the X-ray diffraction result.
SYNTHESES AND PROPERTIES OF TRIMETHYLBISDEHYDRO[21]ANNULENONE AND THE BENZANNELATED DERIVATIVES
Authors: Ojima Juro , Nakagawa Yukiko , Wada Kazuyo , Terasaki Masayuki
Published: July 2006

Syntheses of 2,9,14-trimethyl- 2, 14-methylbenzo[h]4, and 2-methyldibenzo[h,n]-10,12-bisdehydro[21]annulenone 5 are described. The effect of α-methyl substitution and benzannelation for the bisdehydro[21]annulenone ring sytem are discussed.
SYNTHESIS OF (+)-DEOXYVERNOLEPIN
Authors: Watanabe Masataka , Yoshikoshi Akira
Published: July 2006

2,3,3aα,4,5,5a,6,9,9aα,9bβ-Decahydro-3α,9α-dimethyl-5aβ-methoxycarbonyl-2-oxonaphtho[2,3-b]furan (2) accessible from α-santonin was transformed into (+)-deoxyvernolepin (1). The preparation of some α-methylenelactones related to 1 has also been described.
ELECTRON SPIN RESONANCE STUDY OF ARYLDIAZENYL RADICALS IN SOLUTION
Authors: Suehiro Tadashi , Tashiro Takaaki , Nakausa Ryuichi
Published: July 2006

Esr spectra of phenyl- and p-substituted phenyl-diazenyl radicals in solution give aN1 \backsimeq 23 G, aN2 - 9.4 G, and aH \backsimeq 1.1 G (two meta hydrogens), suggesting a free rotation of the N1=N2 group around the C1–N1 bond. o-Monosubstituted phenyldiazenyl radicals prefer to take a planar conformation, and show a hyperfine coupling constant of only one meta hydrogen-5.
REGIOSPECIFIC ALLYLATION OF SULFUR SUBSTITUTED ACTIVE METHYLENE COMPOUNDS WITH ALLYLIC BROMIDES
Authors: Ono Noboru , Miyake Hideyoshi , Tanabe Yo , Tanaka Kazuhiko , Kaji Aritsune
Published: July 2006

Allylation sulfur substituted active methylene compounds such as RSCH2Y [Y = C(=O)R, COOR, CN] with allylic bromides in the presence of bases gives a mixture of the SN2-product and the apparent SN2′-product. The former product is selectively obtained in alkylation in a nonpolar solvent. Synthetic utility of this regiospecific allylation is demonstrated in the simple synthesis of pellitorine.
TOPOLOGY OF TECTOSILICATE FRAMEWORK
Authors: Sato Mitsuo , Ogura Toshihiko
Published: July 2006

A new concept of coordination network is introduced for classifying and deriving possible frameworks of tectosilicates. 26 topologically different networks have been derived by connecting points with the degree of freedom 3 in the 2nd distance. 39 different tectosilicate structures are examined in view of this coordination network.
A PRELIMINARY STUDY ON CONFORMATIONAL ANALYSIS OF ION PAIRS CONTAINING [Co(en)3]3+
Authors: Yoshikawa Yuzo
Published: July 2006

The conformational analysis was performed for the systems of the ion pairs, Λ-[Co(en)3]3+–ClO4−–, – SO42−– , –PO43−–, and -tart2−- nH2O. The analysis of the Λ-[Co(en)3]3+ - tart2− - 25H2O systems gave the results consistent with the experimental data of the stereoselective ion associations, in which the approximation of a dielectric constant dependent on inter-charge distance was made. The structures of Λ-[Co(en)3]3+ -tart2− suggest that two hydroxyl groups of a tartrate ion play an important role.
STEREOSELECTIVE SYNTHESIS OF MESO(OR ERYTHRO) 1,3-DIOLS FROM β-HYDROXYKETONES
Authors: Narasaka Koichi , Pai Hong Chang
Published: July 2006

Meso(or erythro) 1,3-diols are prepared in high stereoselectivity from β-hydroxyketones by the treatment with tributylborane and the successive reduction with sodium borohydride.
REGIOSELECTIVE PARA-CHLORINATION OF ALKYLBENZENES ON CHEMICALLY-MODIFIED SILICA SURFACES
Authors: Konishi Hisatoshi , Yokota Kiyoshi , Ichihashi Yuji , Okano Tamon , Kiji Jitsuo
Published: July 2006

Chlorination of alkylbenzenes was carried out with chlorine in carbon tetrachloride in the presence of chemically-modified silica catalysts. The para/ortho ratios were remarkably higher than those obtained in the FeCl3-catalyzed chlorination. t-Butylbenzene was chlorinated at para-position almost exclusively. The catalyst could be reused several times.
FULVALENE TYPE COMPOUNDS CONTAINING 1,3-DITHIEPIN COUNTERPART. QUALITATIVE EVALUATION OF THE ELECTRON ACCEPTING ABILITY OF 1,3-DITHIEPIN SYSTEM
Authors: Sugihara Yoshikazu , Fujiyama Yoshiko , Murata Ichiro
Published: July 2006

Some fulvalenoids containing 1,3-dithiepin counterpart (5a), (5b), and (5c) have been synthesized through the reaction of 2-trimethylsilyl-1,3-dithiepinide ion (6) with di-tert-butyl-cyclopropenone, 2,3;6,7-dibenzotropone, and fluorenone, respectively. Comparison of the 1H-NMR spectra of these fulvalenes indicated the electron accepting ability of the 1,3-dithiepin moiety.
DIPHOSPHORUS TETRAIODIDE AS A MILD AND EFFICIENT REAGENT FOR THE DEOXYGENATION OF SULFOXIDES
Authors: Suzuki Hitomi , Sato Naofumi , Osuka Atsuhiro
Published: July 2006

By treatment with diphosphorus tetraiodide in dichloromethane at room temperature, sulfoxides are rapidly deoxygenated to the corresponding sulfides in high yields.
SOME EFFECTS OF R(R=Li,Na AND K) IONS ON CRYSTAL GROWTH OF RNd(WO4)2 CRYSTALS FROM TERNARY SYSTEMS Nd2O3–WO3–R2CO3
Authors: Oishi Shuji , Tate Isao
Published: July 2006

RNd(WO4)2(R=Li,Na and K) crystals were grown from high-temperature solutions of ternary systems Nd2O3–WO3–R2CO3 by slow cooling. Grown RNd· (WO4)2(R=Li and K) crystals were generally bigger than NaNd(WO4)2 crystals. These crystals, whose shapes were octahedron or decahedron, were reddish purple and mostly transparent. Among these tungstate crystals, NaNd(WO4)2 crystals had the highest melting point of 1235±5°C.
POTENTIAL ENERGY SURFACE OF [Cu(H2O)6]2+ AND [Zn(H2O)6]2+ DERIVED FROM AB INITIO MO CALCULATIONS
Authors: Sano Mitsuru , Yamatera Hideo
Published: July 2006

Ab initio molecular orbital calculations on [Cu(H2O)6]2+ and [Zn(H2O)6]2+ have been carried out to obtain the metal-oxygen bond lengths. The calculated results are in qualitative agreement with the expectation from the Jahn-Teller theorem; a distorted octahedron for Cu2+ and a regular octahedron for Zn2+. However, the preference for an elongated octahedron observed in the Cu2+ complex was not shown by the present calculation.
TEMPERATURE DEPENDENCE OF ACTIVATION VOLUME FOR ACETOLYSIS OF 2-ARYL-2-METHYLPROPYL TOSYLATES
Authors: Sera Akira , Yamada Hiroaki , Masaki Hitoshi
Published: July 2006

The activation volume of the acetolysis of the title compounds was found to have an unexpectedly large temperature dependence. The activation volume—temperature profile of a steep concave was observed which was responsible for the previously reported anomaly of the substituent dependence of the activation volume.
DIANION OF N-(o-METHOXYPHENYL)-2-METHYLPROPENAMIDE: A NEW REAGENT FOR THE CONVENIENT SYNTHESIS OF α-METHYLENE-γ-BUTYROLACTONES FROM CARBONYL COMPOUNDS
Authors: Tanaka Kazuhiko , Nozaki Yoshihito , Tamura Norikazu , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

Dianion of N-(o-methoxyphenyl)-2-methylpropenamide was successfully generated on treatment of the amide with t-BuOK–BuLi at −78°C in THF and utilized as the key reagent for the synthesis of γ-substituted α-methylene-γ-butyrolactones.
THE SYNTHESES AND ABSOLUTE CONFIGURATIONS OF FOMANNOXIN, (−)-5-ACETYL-2-(1-HYDROXYMETHYLVINYL)-2,3-DIHYDROBENZOFURAN, AND ANODENDROIC ACID
Authors: Kawase Yoshiyuki , Yamaguchi Seiji , Inoue Osamu , Sannomiya Michiko , Kawabe Kazuko
Published: July 2006

The title compounds were synthesized from (−)-(S)- or (+)-(R)-2,3-dihydrobenzofuran-2-carboxylic acid. And their absolute configurations were determined.
A HIGHLY EFFICIENT AND RECYCLABLE CHIRAL DIRECTOR FOR ASYMMETRIC SYNTHESIS OF SULFOXIDES
Authors: Hiroi Kunio , Sato Shuko , Kitayama Ryuichi
Published: July 2006

The benzoxathiazine 2-oxide derivatives (2a–f) were prepared by reaction of the aminophenols (1a–f) with thionyl chloride in good yields. Equilibrium of 2a (R1=α-C10H7, R2=CH3) with hydrogen chloride and subsequent reaction with phenylmagnesium bromide followed by action of methyl- or butyllithium gave (S)-(−)-4a or (S)-(−)-4b with high enantiomeric excess, respectively.
NUCLEOPHILIC SUBSTITUTION OF ALCOHOL AT PHOSPHORUS OF SPIRO ACYLOXYPHOSPHORANE: TRANSPHOSPHORANYLATION
Authors: Kobayashi Shiro , Narukawa Yukitoshi , Hashimoto Takatsugu , Saegusa Takeo
Published: July 2006

Spiro acyloxyphosphoranes (S-AOPs, 1 and 3) underwent the nucleophilic substitution of alcohols at the phosphorus atom to give another S-AOPs (2) (Transphosphoranylation). Reaction mechanism and characteristics of the transphosphoranylation are described.
OXYMERCURATION-DEMERCURATION OF 6-METHYLENETRICYCLO[3.2.1.02,7]OCT-3-EN-8-ONE DERIVATIVES. AN EFFICIENT SYNTHESIS OF 2,4-CYCLOHEXADIENONE DERIVATIVES
Authors: Nitta Makoto , Omata Akihiko , Sugiyama Hiroshi
Published: July 2006

Oxymercuration-sodium borohydride reduction of 1,5-dimethyl-and 1,3,5-trimethyl-6-methylenetricyclo[3.2.1.02,7]oct-3-en-8-one was found to give 6-acetonyl-2,6-dimethyl- and 6-acetonyl-2,4,6-trimethyl-2,4-cyclohexadienones in good yields. The possible intermediates and the reaction mechanism were studied.
ISOLATION AND STRUCTURE OF NEODICTYOPROLENE, A NEW C11-COMPOUND OF BIOGENETIC SIGNIFICANCE FROM A BROWN ALGA DICTYOPTERIS PROLIFERA
Authors: Yamada Kiyoyuki , Ojika Makoto , Tan Hiroaki
Published: July 2006

Neodictyoprolene isolated as a trace component of a brown alga Dictyopteris prolifera was shown to be the acetate of cis, cis-1,5,8-undecatrien-3-ol postulated to be a pivotal biosynthetic intermediate leading to biologically active C11-substances such as sex attractants of brown algae (e.g., ectocarpene).
SYNTHESIS OF NOVEL PROSTANOIDS HAVING A CYCLOPENTA[c]FURAN STRUCTURE WITH A HEMITHIOACETAL SIDE CHAIN FROM AUCUBIN
Authors: Ohno Kiyotaka , Naruto Masanobu
Published: July 2006

The titled prostanoids, methyl (Z)-7-[(3aR,5S,6R,6aR)-1-(2-substituted-2-hydroxyethylthio)-5-hydroxy-hexahydro-1H-cyclopenta[c]furan-6-yl]-5-heptenoates, were prepared from aucubin via hemi-thioacetalization in construction of the alkyl-end (C13–C20) side chain.
A FACILE PREPARATION OF ASYM-MONOMETHYL, SYM-MONOMETHYL AND ASYM-DIMETHYL CITRATE
Authors: Hirota Kazuhiro , Kitagawa Harukazu , Shimamura Michiya , Ohmori Shinji
Published: July 2006

Asym-monomethyl citrate was prepared by hydrolysis of sym-dimethyl citrate. Sym-monomethyl and asym-dimethyl citrate were prepared by a selective hydrolysis of trimethyl citrate.