bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNTHESIS OF A NEW COPPER ANTIMONY OXIDE, Cu9Sb4O19, BY SOLID STATE REACTION BETWEEN CuO AND CuSb2O6 UNDER HIGH PRESSURE
Authors: Shimada Shiro , Kodaira Kohei , Matsushita Toru
Published: July 2006

A new copper antimony oxide was synthesized by solid state reaction between CuO and CuSb2O6 in a 3.5:1 mole ratio at 1000 °C and 10 kbar and was found to have the composition Cu9Sb4O19 by X-Ray fluorescence analysis. The new oxide could be indexed on the basis of a body-centred cubic unit cell with ao=9.620 Å.
THE HIGHLY SELECTIVE REACTION OF LITHIUM DITHIOESTER ENOLATES WITH β-ALKENYL-β-PROPIOLACTONES: A SIMPLE METHOD FOR THE SYNTHESIS OF 6-(METHYLTHIO)THIOCARBONYL-(E)-3-ALKENOIC ACIDS
Authors: Fujisawa Tamotsu , Itoh Toshiyuki , Sato Toshio
Published: July 2006

Lithium dithioester enolates were found to react with β-alkenyl-β-propiolactones highly regio- and stereoselectively at the terminal vinyl carbon to give 6-(methylthio)thiocarbonyl-(E)-3-alkenoic acids, masked 1,7-dicarboxylic compounds.
PHOTOOXYGENATION OF SILACYCLOPENTADIENES: A NOVEL OXYGENATION PRODUCT, 2,4-DIOXA-3-SILABICYCLO[3.2.0]HEPT-6-ENE, AND ITS CYCLOREVERSION REACTIONS
Authors: Nakadaira Yasuhiro , Nomura Tamotsu , Kanouchi Seiichi , Sato Ryuji , Kabuto Chizuko , Sakurai Hideki
Published: July 2006

Photooxygenation of 1,1-dimethyl-2,3,4,5-tetraphenyl-1-silacyclopentadiene afforded 2,4-dioxa-3-silabicyc[3.2.0]hept-6-ene(III) together with dibenzoylstilbene. The former was converted to isodidesyl and didesyl by treatment on alumina. Valence bond isomerization of III to 1,3-dioxa-2-silacyclohepta-4,6-diene occurs both thermally and photochemically.
UNUSUALLY LARGE DESHIELDING OF 29Si IN 7-SILANORBORNADIENES AND RELATED COMPOUNDS
Authors: Sakurai Hideki , Nakadaira Yasuhiro , Koyama Takeshi , Sakaba Hiroyuki
Published: July 2006

Bridge silicon atoms in [2.2.1] bicyclic systems display unusually large deshielding in 29Si NMR. An explanation is given to account for the phenomena.
MECHANOCHEMICAL CHANGE OF TRISODIUM ISOHYPOPHOSPHATE TETRAHYDRATE BY GRINDING
Authors: Nariai Hiroyuki , Tsuhako Mitsutomo , Motooka Itaru
Published: July 2006

Mechanochemical change of trisodium isohypophosphate tetrahydrate (P3–O–P5), one of the lower phosphorus oxoacid salts, was investigated by analysis of species of phosphorus oxoanions. On grinding of P3–O-P5–salt, the P–O–P linkages were broken to give phosphonate and pyrophosphate. This shows that the decomposition of P3–O–P5-salt and the recombination of two phosphate radicals produced by grinding, occurred due to grinding.
THE CRYSTAL AND MOLECULAR STRUCTURE OF PYRIDINE-BORON TRIBROMIDE
Authors: Iijima Kinya , Oonishi Isao , Shibata Shuzo
Published: July 2006

The crystal and molecular structure of pyridine-boron tribromide C5H5N·BBr3 has been determined by an X-ray diffraction method. The unit cell is monoclinic with a=9.396(3) Å, b=15.176(7) Å, c=6.558(2) Å, β=101.85(3)°, and Z=4. The space group is P21/a. Pyridine is bound to boron tribromide via nitrogen atom so that the atomic arrangement around the boron atom is tetrahedral with N–B=1.59(2) Å and B–Br=1.99(2) Å.
NEGATIVE ION CHEMICAL IONIZATION MASS SPECTRA OF POLYCYCLIC AROMATIC HYDROCARBONS
Authors: Iida Yoshio , Daishima Shigeki
Published: July 2006

Negative ion chemical ionization mass spectra were evaluated for 21 polycyclic aromatic hydrocarbons. The spectra exhibited some peculiar peaks corresponding to (M-H)−, M\ewdot and MH−. These ions were found to be useful to identify and detect such polycyclic aromatic hydrocarbons and also to distinguish the isomers.
THE ENHANCEMENT OF ACID STRENGTH AND CATALYTIC ACTIVITY OF SnO2 BY THE ADDITION OF SULFATE ION
Authors: Wang Gong-Wei , Hattori Hideshi , Tanabe Kozo
Published: July 2006

The addition of about 3 wt% of sulfate ion to SnO2 caused the enhancement in the acid strength from H0=+3.3 to −8.2. The catalytic activity of SnO2+SO42− for the isomerization of cyclopropane at 100°C was found to be higher than 100 times that of simple SnO2 for the same reaction at 300°C. The effect of sulfate ion was remarkable also for the dehydration of 2-butanol.
SYNTHESIS OF IMIDAZOLE DERIVATIVES FROM α-HALOOXIMES AND AMIDINES BY USE OF IRON CARBONYLS
Authors: Nakanishi Saburo , Nantaku Junji , Otsuji Yoshio
Published: July 2006

The reaction of α-halooximes with amidines in the presence of iron carbonyls gives imidazole derivatives in good yields. This reaction occurs via deoxygenation of 4H-1,2,5-oxadiazines by iron carbonyls.
REACTION OF TRIMETHYLSILYL ENOL ETHERS WITH ISOQUINOLINIUM SALTS. A FACILE SYNTHESIS OF ETHYL 1-(2-OXOALKYL)-1,2-DIHYDROISOQUINOLINE-2-CARBOXYLATES AND THEIR CYCLIZATION
Authors: Wada Makoto , Nakatani Masayuki , Akiba Kin-ya
Published: July 2006

An efficient method is described for the synthesis of ethyl 1-(2-oxoalkyl)-1,2-dihydroisoquinoline-2-carboxylates by C–C bond formation between 2-ethoxycarbonylisoquinolinium chloride and trimethylsilyl enol ethers. The products were treated with a few bases to afford the corresponding pyrido [2,1-a] isoquinoline derivatives.
FAR-INFRARED SPECTRA OF AsF5 DOPED (CH)X
Authors: Tanaka Masashi , Fujimoto Hitoshi , Kamiya Kohji , Tanaka Jiro
Published: July 2006

Far-infrared spectra were measured with the AsF5 doped polyacetylene films in order to understand the electrical conduction mechanism. From the reflection data, the mechanism of the insulator-metal transition is discussed. That is, the intermediately doped film consists of small metallic particles and the highest doped film becomes the homogeneous metal, while the soliton model may be supported for the light doping.
REACTIONS OF ALLYLSILANES WITH α-CHLORO ETHERS CATALYZED BY IODOTRIMETHYLSILANE OR TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE. SYNTHESIS OF HOMOALLYL ETHERS
Authors: Sakurai Hideki , Sakata Yasuyuki , Hosomi Akira
Published: July 2006

Iodotrimethylsilane and trimethylsilyl triflate activate selectively the C–Cl bond rather than the C–O bond of α-chloro ethers and catalyze the allylation with allylsilanes to give the corresponding homoallyl ethers effectively in good yield.
RADIATION CHEMISTRY OF DNA COMPONENTS. FORMATION OF THE 8,5′-CYCLO-2′,5′-DIDEOXYGUANOSINE BY GAMMA IRRADIATION OF DEAERATED AQUEOUS SOLUTIONS OF 2′-DEOXYGUANOSINE AND ITS 5′-MONOPHOSPHATE ESTER
Authors: Berger M , Cadet J
Published: July 2006

8,5′-cyclo-2′,5′-dideoxyguanosine was shown to be produced by gamma irradiation of deaerated aqueous solutions of 2′-deoxyguanosine and 2′-deoxyguanosine-5′-monophosphate, subsequent to initial hydrogen abstraction at the osidic carbon C(4′). Structure assignment was made on the basis of UV, 1H and 13C NMR, mass spectrometry analyses, and confirmed by an independent synthesis.
DIPHOSPHORUS TETRAIODIDE AS A NEW MILD CONDENSING AGENT FOR THE SYNTHESIS OF AMIDES
Authors: Suzuki Hitomi , Tsuji Junko , Hiroi Yoshio , Sato Naofumi , Osuka Atsuhiro
Published: July 2006

In the presence of diphosphorus tetraiodide, a variety of weak carboxylic acids readily react with amines to form the corresponding amides in high yields.
PHOTOOXYGENATION OF 1,2-DIARYLCYCLOPROPANES: FORMATION OF 3,5-DIARYL-1,2-DIOXOLANES VIA PHOTOINDUCED ELECTRON TRANSFER
Authors: Mizuno Kazuhiko , Kamiyama Nobuhiro , Otsuji Yoshio
Published: July 2006

The photooxygenation of electron-rich 1,2-diarylcyclopropanes such as 1,2-bis(4-methoxyphenyl)cyclopropane and 1-(4-methoxyphenyl)-2-phenylcyclopropane in the presence of 9,10-dicyanoanthracene(DCA) as a sensitizer in acetonitrile affords trans- and cis-3,5-diaryl-1,2-dioxolanes in high yields. This photooxygenation is initiated by the electron transfer from 1,2-diarylcyclopropanes to the excited singlet DCA, involving the cation radical of cyclopropanes as a key intermediate.
LOW TEMPERATURE HEAT CAPACITIES OF 1,1′-BIPHENYL AND 1,1′-BIPHENYL-d10
Authors: Atake Tooru , Saito Kazuya , Chihara Hideaki
Published: July 2006

Heat capacities of 1,1′-biphenyl-d10 were measured between 3 and 300 K and phase transitions were located at 20.2 and 36.8 K with entropies of transition, 0.009 and 0.128 J·K−1·mol−1, respectively. Remeasurements of heat capacities of 1,1′-biphenyl-h10 below 20 K showed that an anomaly at 11 K previously reported was a false one which probably was due to a defect in germanium thermometer scale. Revised thermodynamic properties relating to phase transitions are given.
SYNTHESIS OF 2,2,2-TRISUBSTITUTED 5-TRIFLU0R0METHYL-Δ4-1,3,4,2-OXADIAZAPHOSPHOLINES AND THEIR POTENTIALITY AS PRECURSORS OF TRIFLUOROACETONITRILE IMINES
Authors: Tanaka Kiyoshi , Igarashi Toh-ru , Mitsuhashi Keiryo
Published: July 2006

N′-Phenyl- and methyltrifluoroacetohydrazides react with phosphorus pentachloride to give the corresponding 2,2,2-trichloro-3-phenyl- and methyl-Δ4-1,3,4,2-oxadiazaphospholines, from which various 2,2,2-trisubstituted derivatives are further synthesized. Heating 3-phenyl-2,2,2-tris(p-tolyloxy) analog with an excess of styrene affords 1,5-diphenyl-3-trifluoromethyl-2-pyrazoline, which indicates that the phospholine behaves as a precursor of trifluoroacetonitrile phenylimine.
RING CLEAVAGE REACTIONS OF SUBSTITUTED 2-ISOXAZOLINES BY PENTACARBONYLIRON UNDER ULTRAVIOLET IRRADIATION
Authors: Nitta Makoto , Kobayashi Tomoshige
Published: July 2006

The photoirradiation of 3,5-disubstituted 2-isoxazolines and Fe(CO)5 in MeOH causes the N–O and C4–C5 bond cleavage to give two fragments of aldehydes and ketones, while that of 2-isoxazolines having no substituent at 5-position gives additional β-hydroxy- and β-methoxyketones.
COMPLETE DIASTEREOFACE SELECTION IN THE LEWIS ACID-MEDIATED ALDOL REACTIONS OF C,O-DISILYLATED γ-BUTYROLACTONE ENOLATES WITH ALDEHYDES
Authors: Yamamoto Keiji , Tomo Yoichi
Published: July 2006

Titanium(IV) chloride-mediated reaction of 4,5-dihydro-5-methyl-2-(trimethylsiloxy)-3-(trimethylsilyl)furan (1b) with acetaldehyde gave diastereomerically pure (3R*,5R*,1′S*)-4,5-dihydro-3-{1′-(hydroxyethyl)}-5-methyl-3-(trimethylsilyl)-2(3H)furanone (2b), exhibiting excellent diastereoface selection as well as threo diastereoselection. An anolog with 4-methyl substituent (1c) behaves similarly.
EVIDENCE FOR “PSEUDO-LIQUID PHASE” IN THE DEHYDRATION OF ISOPROPANOL OVER H3PW12O40
Authors: Okuhara Toshio , Hashimoto Tomihito , Misono Makoto , Yoneda Yukio , Niiyama Hiroo , Saito Yoshinori , Echigoya Etsuro
Published: July 2006

Transient response method using isotopically labeled isopropanol was applied to confirm the “pseudo-liquid phase” behavior of the dehydration of isopropanol over H3PW12O40. Results were treated by moment analysis. Under the stationary state of catalytic reaction at 80–90°C, a large amount of isopropanol was present in the bulk and the absorption–desorption process of isopropanol in the whole bulk was much more rapid than its dehydration to propene, demonstrating the “pseudo-liquid phase” behavior.
PHOTOCATALYTIC HYDROGEN EVOLUTION FROM AN AQUEOUS METHANOL SOLUTION OVER CERAMICS-ELECTROCATALYST/TiO2
Authors: Oosawa Yoshinao
Published: July 2006

The activities of TiO2 powders loaded with various kinds of transition metal borides, nitrides, phosphide, carbides for the photocatalytic hydrogen evolution from an aqueous methanol solution have been examined. It has been found that WC/TiO2 has the highest activity among them going up one fourth of that of platinum black/TiO2.
DIASTEREOSELECTION IN A DIRECTED CROSSED ALDOL REACTION BETWEEN TWO POLYOXYGENATED KETONES EMPLOYING TIN(II) ENOLATES. A FACILE STEREOSELECTIVE SYNTHESIS OF ETHYL 2-C-METHYL-Dl-LYXOFURANOSIDE
Authors: Stevens Rodney W , Mukaiyama Teruaki
Published: July 2006

Tin(II) enolates of 1,3-dihydroxy-2-propanone derivatives react with a second ketone, methyl pyruvate, under mild conditions to afford the corresponding anti-crossed aldol products in moderate to excellent yields. Facile elaboration to the branched-chain sugar, ethyl 2-C-methyl-Dl-lyxofuranoside, was demonstrated.
CRYSTAL AND MOLECULAR STRUCTURE OF PIQUEROL A A POTENT GROWTH-INHIBITING FACTOR
Authors: Soriano-Garcia Manuel , Jimenez Manuel , Gonzalez M , Hernandez A , Schatz M , Campana C
Published: July 2006

Crystal and molecular structure of piquerol A isolated from Piqueria trinervia Cav was determined. The X-ray study confirms that in the solid-state the structure of piquerol A is similar to that inferred from NMR spectra. The isopropenyl group is planar and makes approximately 38.4° with the mean plane for the six-membered ring. The two hydroxyl groups are above the plane through the six-membered ring, while the C4 and H5 are below this plane.
SURFACE TRIIRON CARBONYLS SUPPORTED BY THE REACTIONS OF Fe3(CO)12 WITH γ-Al2O3 OR SiO2
Authors: Iwasawa Yasuhiro , Yamada Makoto , Ogasawara Sadao , Sato Yoshiharu , Kuroda Haruo
Published: July 2006

It is shown by means of Extended X-ray Absorption Fine Structure (EXAFS), IR and UV spectroscopies and by temperature programmed decomposition (TPDE) and gas phase analyses that Fe3(CO)12 reacted with the surface OH group of γ-Al2O3 to give the surface complex, Fe3(CO)10(H)(OAl(Remark: Graphics omitted.)), while Fe3(CO)12 was weakly supported on SiO2 retaining its original structure and chemical nature.
THE ROLE OF VITAMIN C AS AN ANTIOXIDANT
Authors: Niki Etsuo , Saito Tadatoshi , Kamiya Yoshio
Published: July 2006

Ascorbic acid (vitamin C) was found to act as a radical scavenger and suppress the oxidation of methyl linoleate in homogeneous alcohol solution in the presence of radical initiator. Furthermore, vitamin C showed a synergistic effect when used with vitamin E.
SYNTHESES OF A NEW CLASS OF DYES-COUPLING REACTIONS OF DIAZONIUM SALTS WITH 2- AND 3-ALKOXY-1,6-METHANO-[10]-ANNULENES
Authors: Neidlein Richard , Radke Christoph Martin , Gottfried Reiner
Published: July 2006

2- and 3-Alkoxy-1,6-methano-[10]-annulenes were coupled with aryldiazonium salts yielding the corresponding quinone hydrazones as cycloheptatriene derivatives. Analytical data are discussed.
THE STRUCTURE OF HALOGEN ADDUCTS OF SOME SELENIDES AND A TELLURIDE IN SOLUTION STUDIED BY 1H AND 13C NMR SPECTROSCOPY. EVIDENCE FOR THE FORMATION OF A MOLECULAR COMPLEX OF SELENOXANTHONE WITH BROMINE
Authors: Nakanishi Waro , Yamamoto Yasuhiro , Kusuyama Yoshiaki , Ikeda Yoshitsugu , Iwamura Hiizu
Published: July 2006

1H and 13C NMR chemical shifts of dimethyl selenide, selenoanisole, diphenyl selenide, phenoxyselenine, and phenoxytellurine and their chlorine, bromine, and iodine adducts have been measured to disclose the structure of the adducts in solution. The bromine adduct of selenoxanthone was found to have the structure of a molecular complex. The relative stability of selenuranes is discussed.
LABORATORY SCALE DEMONSTRATION OF THE Mg–S–I CYCLE FOR THERMOCHEMICAL HYDROGEN PRODUCTION
Authors: Kumagai Toshiya , Mizuta Susumu
Published: July 2006

The Mg–S–I water splitting cycle was demonstrated on a laboratory scale by constructing an apparatus for repeated operations of chemical reactions of the whole cycle and by the circulation of reactants through purely thermochemical processes below 1000°C. Electric furnaces and quartz glass reactors were used. Sixteen times of cycle operations were performed in 16 h with production rates of 0.3 liter H2/h and 0.15 liter O2/h.
FORMATION AND CONVERSION OF AN EXTRAORDINARY SPECIES OF MOLYBDOPHOSPHATE IN AQUEOUS ACETONITRILE SOLUTIONS
Authors: Hori Toshitaka , Fujinaga Taitiro
Published: July 2006

The existence of two species of molybdophosphate has been recognized in aqueous acetonitrile solutions. The one, which was called here as “extraordinary” molybdophosphate, forms quite rapidly and exhibits a bright yellow colour, but is unstable and undergoes a spontaneous conversion to the other. The latter complex would be of dodecamolybdophosphate in Keggin’s structure.
PROTON DRIVEN ACTIVE TRANSPORT OF ALKALI METAL CATIONS BY USING ALKYL MONOAZA CROWN ETHER DERIVATIVES
Authors: Matsushima Kenji , Kobayashi Hirofumi , Nakatsuji Yohji , Okahara Mitsuo
Published: July 2006

Octyl monoaza 18-crown-6 and the corresponding nitrogen lariat ethers were discolsed to be good carriers for the active transport of alkali metal cations. The transport ability is well corresponding to the complexing ability and the transport system has a characteristic of using the large change in the complexing ability between the acidic and alkaline phases.
EFFICIENT HYDROGEN PRODUCTION FROM WATER BY VISIBLE LIGHT EXCITATION OF FLUORESCEIN-TYPE DYES IN THE PRESENCE OF A REDOX CATALYST AND A REDUCING AGENT
Authors: Hashimoto Kazuhito , Kawai Tomoji , Sakata Tadayoshi
Published: July 2006

A hydrogen production system for visible light without an electron relay, efficient in the high pH region, is constructed with some fluorescein derivatives in the presence of a redox catalyst and a sacrificial reducing agent.
SIGNAL RECEPTIVE CAPSULE MEMBRANE. Ca2+-INDUCED PERMEABILITY CONTROL OF LARGE NYLON CAPSULE COATED WITH SYNTHETIC BILAYER MEMBRANE
Authors: Okahata Yoshio , Lim Han-jin , Nakamura Gen-ichi
Published: July 2006

Nylon ultrathin capsules coated with sodium didodecyl phosphate bilayer membrane were prepared. Permeation of NaCl from the inner aqueous phase of the coated capsule was reversibly increased by treating with Ca2+, and decreased to the original rate by washing with EDTA from outside.
ENANTIOSELECTIVE ADDITION OF DIETHYLZINC TO ARYLALDEHYDES CATALYZED BY CHIRAL COBALT(II) AND PALLADIUM(II) COMPLEXES
Authors: Oguni Nobuki , Omi Takao , Yamamoto Yoshihiro , Nakamura Akira
Published: July 2006

The reaction of diethylzinc with arylaldehydes catalyzed by Co(α-cqdH)2 and Pd(α-cqdH)2 in toluene at room temperature gave optically active alcohols almost quantitatively in 40–60% ee.
PHOTOLYSIS AND PYROLYSIS OF POLYSILYLATED DIAZOMETHANES. EFFECTIVE MIGRATING TENDENCY OF TRIMETHYLSILYL GROUP TO A CARBENE CENTER
Authors: Sekiguchi Akira , Ando Wataru
Published: July 2006

Photolysis and pyrolysis of polysilylated diazomethanes were investigated, and a selective migration of trimethylsilyl group to a carbene center was observed.
LANTHANOID CHLORIDE COMPLEXES WITH POLYETHYLENE GLYCOLS AND GLYMES
Authors: Hirashima Yoshiyuki , Ito Kaoru , Shiokawa Jiro
Published: July 2006

Lanthanoid chlorides formed the 1:1 complexes with triethylene glycol, tetraethylene glycol, pentaethylene glycol, tetraglyme, and pentaglyme. All the complexes were deliquescent. The yield of the solid complex with tetraethylene glycol decreased with the increase of the atomic number of the lanthanoid.
A CONVENIENT CONVERSION OF ALDOXIMES TO NITRILES UNDER PHASE-TRANSFER CONDITIONS
Authors: Shinozaki Hiraku , Imaizumi Mari , Tajima Moritaka
Published: July 2006

A variety of aldoximes were converted into the corresponding nitriles by using carbon disulfide as dehydration reagent under phase-transfer conditions. One-pot syntheses of nitriles from aldehydes are also described.
AN ASYMMETRIC SYNTHESIS OF α-BENZYLOXY ALDEHYDES HAVING A CHIRAL TERTIARY CENTER—AN APPLICATION TO THE ASYMMETRIC SYNTHESIS OF exo-(+)-BREVICOMIN—
Authors: Asami Masatoshi , Mukaiyama Teruaki
Published: July 2006

α-Benzyloxy aldehydes having a chiral tertiary center at α-carbon atom are synthesized in high enantiomeric excess by successive treatment of 2-methoxycarbonyl-3-phenyl-1,3-diazabicyclo[3.3.0]octane with diisobutylaluminum hydride (DIBAL-H) and Grignard reagents. The asymmetric reaction is applied to the total synthesis of exo-(+)-brevicomin.
EFFECTS OF VARIOUS PRETREATMENTS OF THE Rh–Y ZEOLITE ON THE CATALYTIC ACTIVITY FOR ETHYLENE HYDROFORMYLATION UNDER ATMOSPHERIC PRESSURE
Authors: Takahashi Nobuo , Hasegawa Shuichi , Hanada Norio , Kobayashi Masayoshi
Published: July 2006

The active species for ethylene hydroformylation formed in the Y zeolite are extremely stable under the reaction conditions and the steady activity lasts more than one month. The catalytic activity is remarkably affected by the pretreatment of the catalyst; the He–H2 pretreatment at 338–453 K enhances the activity while the He–CO or He–CO–C2H4 pretreatment at 400 K reduces it.
CRYSTAL STRUCTURE AND ELECTRICAL CONDUCTIVITY OF (Et4N)0.5[Ni(dmit)2]
Authors: Kato Reizo , Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao
Published: July 2006

The crystal of (Et4N)0.5[Ni(dmit)2] belongs to triclinic system (dmit: isotrithionedithiolate). In the crystal, face-to-face stacking and side-by-side arrangement of Ni(dmit)2 molecules form the two-dimensional S···S networks, which are weakly connected in the third direction by thioketone sulfur atoms in the isotrithione ring. The electrical conductivity measurements show that (Et4N)0.5[Ni(dmit)2] is a semiconductor with small anisotropy.
ASSOCIATION AND REACTIVITY OF AMPHIPHILIC FLAVINS. 8-ALKYL MERCAPTOFLAVINS AND THE CORRESPONDING BIS-FLAVINS IN AQUEOUS SOLUTION
Authors: Yano Yumihiko , Ohya Eiichi , Kuwabara Yoshinori
Published: July 2006

It was found that 8-octyl mercaptoflavin forms a dimer in aqueous solution, and the absorption spectrum is quite similar to that of the corresponding bis-flavin linked by -(CH2)3- at 10,10′-positions of the isoalloxazine rings. The association mode and the reactivity for oxidation of N-benzyl-1,4-dihydronicotinamide(BNAH) are discussed.
THE DYNAMIC STRUCTURE OF THE POLAR-GROUP OF CARDIOLIPIN IN E.COLI PHOSPHOLIPID BILAYER AS MONITORED BY 2H-NMR
Authors: Yoshikawa Wataru , Akutsu Hideo , Kyogoku Yoshimasa , Akamatsu Yuzuru
Published: July 2006

The glycerol part of E.coli phospholipid was specifically deuterated by supplying 2H5-glycerol in growth media of glycerol-requiring auxotroph. The 2H-spectra of cardiolipin were obtained for dispersion of the purified deuterated cardiolipin mixed with non-deuterated other components. The structure of the whole polar region of cardiolipin in the lipid bilayer appeared to be dynamically symmetric, and quite rigid.
STUDIES ON ALKALINE EARTH SULFITES - V. STRUCTURE AND STABILITY OF THE NEW COMPOUND Ca3(SO3)2SO4·12H2O AND ITS SOLID SOLUTION IN CALCIUM SULFITE TETRAHYDRATE
Authors: Cohen Abraham , Zangen Mendel
Published: July 2006

The hitherto unknown double-salt Ca3(SO3)2SO4·12H2O and its solid solution in CaSO3·4H2O are reported. The new salts were prepared from aqueous solutions at 3–5 °C and studied by chemical analysis, thermal analysis and X-ray powder diffraction. Chemical compositions, dehydration temperatures, calculated and measured X-ray diffraction patterns and lattice parameters are presented and discussed. The crystallographic structure of the double-salt is very similar to that of CaSO3·4H2O, but the thermal stability of the former is higher.
INDIRECT ELECTROOXIDATION OF N-PROTECTED AMINES TO AMIDES WITH A DOUBLE MEDIATORY SYSTEM CONSISTING OF RuO4, AND Cl+
Authors: Torii Sigeru , Inokuchi Tsutomu , Yukawa Takao
Published: July 2006

Indirect electrooxidative conversion of N-protected aliphatic amines into the corresponding amides with RuO4, in a saturated NaCl-acetone system proceeds in excellent yields.
PENTENE FORMATION FROM PROPIONALDEHYDE ADSORBED ON Rh–Y ZEOLITE
Authors: Takahashi Nobuo , Sato Yoshio , Kobayashi Masayoshi
Published: July 2006

Pentene formation is observed during desorption of propionaldehyde from Rh–Y zeolite into a helium stream, while neither Na–Y zeolite nor H–Na–Y zeolite is effective for pentene formation.
CARBONYLATION OF AMINES CATALYZED BY ORGANOZINC COMPOUND
Authors: Yoshida Yasuhiko , Asano Shoichi , Inoue Shohei
Published: July 2006

Diethylzinc was found to catalyze the carbonylation of amines including aromatic amines to give the corresponding formamides in good yields.
TRANSPORT OF CARBON MONOXIDE FACILITATED BY A CuI–TETRAETHYLENEPENTAMINE SYSTEM
Authors: Kawakami Mitsuyasu , Nagano Hiromi , Iwamoto Masakazu , Kagawa Shuichi
Published: July 2006

The transport of CO through a thin layer of tetraethylenepentamine was found to be enhanced by the presence of CuI ion. The CO uptake measurement and the i.r. study suggested that the facilitated transportation of CO was mediated by the reversible formation of a CuI-carbonyl complex.
CO-PROCESSING OF COAL AND SHALE OIL
Authors: Yoshida Ryoichi , Miyazawa Makoto , Maekawa Yosuke
Published: July 2006

By using shale oil as a vehicle oil in coal liquefaction, low hydrogen consumption, low yield of gaseous products, a high yield of hexane-soluble fraction and high conversion of coal were brought about. Hexane-soluble fraction rich in hydrogen was obtained. The oxygen and nitrogen contents of hexane-soluble fraction were lower than in the original shale oil.
KrF LASER PHOTOLYSIS AND RADIOLYSIS OF 4-VINYLPYRIDINE
Authors: Matsunuma Satoshi , Ishii Tadahiro , Handa Takashi , Arai Shigeyoshi
Published: July 2006

The irradiation of alcoholic solutions of 4-vinylpyridine (VP) with KrF laser pulses produced a transient absorption with a large peak at 335 nm and a small one at 500 nm. The absorption is attributed to a hydrogen-adduct of VP. The radiation chemical results obtained with VP are consistent with the assignment.
OPTICAL RESOLUTION OF Dl-AMINO ACIDS WITH ALIPHATIC SIDE CHAIN BY USING l-PHENYLALANINE
Authors: Shiraiwa Tadashi , Ikawa Akihiko , Sakaguchi Keiji , Kurokawa Hidemoto
Published: July 2006

An aqueous solution containing l-phenylalanine (l-Phe) and Dl-valine, Dl-leucine or Dl-isoleucine in the molar ratio of 1:2 gave adduct composed of equimolar amounts of l-Phe and the amino acids abounding in d-isomer as crystals. From the adducts, the recovered free aliphatic amino acids had about 100% optical purity.
DOUBLE-ARMED 16-CROWN-5. MARKED AND SPECIFIC ENHANCEMENT IN CATION BINDING ABILITIES
Authors: Ouchi Mikio , Inoue Yoshihisa , Wada Kazuhito , Hakushi Tadao
Published: July 2006

16-Crown-5 derivatives with double oxyethylene side-arms of various chain lengths were synthesized and their cation-binding abilities were assessed. In addition to the general enhancement in extractabilities for most cations, peak extractabilities were observed for the size-fitted cations, i.e. Na+ and Ag+, at a specific length of the side-arm.
SYNTHESIS OF (−)-[12,12-2H2]RISHITIN
Authors: Murai Akio , Masamune Tadashi
Published: July 2006

For studies on the vital metabolic pattern of rishitin, a representative phytoalexin of diseased potatoes, (−)-[12,12-2H2]rishitin has been synthesized stereoselectively from (11S)-2α-acetoxy-3-oxo-4β,5α-eudesman-6β,12-olide.
HIGH PRESSURE NMR STUDY ON THE KINETICS OF LIGAND EXCHANGE REACTION IN PENTAKIS(DIMETHYL SULFOXIDE)OXOVANADIUM(IV)
Authors: Harada Masayuki , Ikeda Yasuhisa , Tomiyasu Hiroshi , Fukutomi Hiroshi
Published: July 2006

The kinetics of ligand exchange in [VO(dmso)5]2+ (dmso = dimethyl sulfoxide) has been studied by the high pressure NMR method. The volume of activation ΔV≠ for the dmso exchange at the basal positions of [VO(dmso)5]2+ was determined to be (−5.3±0.4) cm3/mol. This negative value of ΔV≠ is consistent with associative behavior in the ligand substitution processes of oxovanadium(IV) complexes.
PHOTOCHEMICAL REACTION OF DIBENZOTETRAMETHYLDISILACYCLOHEXADIENE THROUGH CHARGE-TRANSFER COMPLEX
Authors: Sakurai Hideki , Sakamoto Kenkichi , Kira Mitsuo
Published: July 2006

The reaction of dibenzo-1,1,2,2-tetramethyl-1,2-disilacyclohexadiene with tetracyanoethylene under illumination with a sodium lamp gave dibenzo-1,1-dimethyl-1-silacyclopentadiene as a silylene extrusion compound through a charge-transfer complex.
DIRECT α-ALLYLATION OF KETONES WITH O-ALLYLISOUREA CATALYZED BY PALLADIUM(0)
Authors: Inoue Yoshio , Toyofuku Masanori , Hashimoto Harukichi
Published: July 2006

Direct α-allylation of ketones catalyzed by a palladium(0)-diphosphine system took place employing O-allylisourea as the allylating reagent under neutral conditions at room temperature in DMF.
PREPARATION OF ZSM-4 AND -5 ZEOLITES BY USING SLUDGE OBTAINED FROM GEOTHERMAL POWER PLANT
Authors: Sato Tosio , Kurita Minoru , Yoshimura Yuji , Shimada Hiromichi , Shin Shigemitsu , Nishijima Akio
Published: July 2006

Zeolites such as ZSM-5 or -4 were easily synthesized by using sludge obtained from geothermal power plants in place of some chemicals. Zeolites prepared were characterized by an X-ray diffractometer and a scanning electron microscope.
EFFICIENT SYNTHESIS OF SECONDARY CARBOXAMIDES WITH ω-SUBSTITUTED ETHYL AND PROPYL GROUPS ON NITROGEN ATOM BY NUCLEOPHILIC RING OPENING OF CYCLIC IMIDATES
Authors: Saito Seiki , Tamai Hideaki , Usui Yuki , Inaba Masami , Moriwake Toshio
Published: July 2006

An efficient synthesis of secondary carboxamides carrying ω-substituted ethyl and propyl groups on nitrogen atom has been developed which highlights nucleophilic ring opening of 2-methyl-2-oxazoline, 2-methyl-2-oxazine, and their derivatives with (CH3)3SiX and HX (X= Cl, N3, SeC6H5, SC6H5) type reagents.
REGENERATION OF AMINO COMPOUNDS FROM THE 2,4,6-TRINITROPHENYL DERIVATIVES BY TREATMENT WITH HYDRAZINE
Authors: Takahashi Seitaro , Yamamura Takaki , Kamo Masaharu , Satake Kazuo
Published: July 2006

2,4,6-Trinitrophenylalanine gave free alanine and 1-hydroxy-4,6-dinitrobenzotriazole by treating with aqueous solution of hydrazine at pH 7–9 and 30 °C. Applying the reaction to partially trinitrophenylated derivative of lima bean trypsin inhibitor, the fully active protein could be regenerated almost quantitatively.
FORMATION OF Co3O4 CLUATERS IN TiO2 SUPPORT OBSERBED BY EXAFS
Authors: Tanabe Syuji , Ida Takashi , Tsuiki Hideyasu , Ueno Akifumi , Kotera Yoshihide , Tohji Kazuyuki , Udagawa Yasuo
Published: July 2006

It was revealed by EXAFS that tiny clusters of Co3O4 are formed in TiO2 support after the calcination step of Co/TiO2 catalyst preparation procedure by alkoxide technique. The high dispersion of these small clusters is attributed to the reason why cobalt metal particles in the catalyst can be controlled in an even size level after the reduction by hydrogen.
ENZYME IMMUNOSENSOR USING HAPTEN-BOUND MEMBRANE AND Fab’-β-d-GALACTOSIDASE COMPLEXES
Authors: Haga Makoto , Ikuta Miki , Kato Yuriko , Suzuki Yasuo
Published: July 2006

An enzyme immunosensor using a hapten-bound membrane and Fab’-β-d-galactosidase complexes has been developed to improve the reproducibility and the capability of multi-cyclic operation. The proposed method may be useful for repeated uses of the enzyme immunosensor without exchanging the membranes.
ISOQUINOLINE DERIVATIVES FROM THE RITTER-TYPE REACTION OF VINYL CATIONS
Authors: Kitamura Tsugio , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Both silver-assisted reaction of β-arylvinyl bromides and the photolysis in nitriles gave isoquinoline derivatives, indicating that the Ritter reaction involving a vinyl cation took place.
PHOTOOXIDATION OF p-METHYLBENZYL ALCOHOL BY OXYGEN, CATALYZED BY FLAVIN ANALOGUES (3-METHYL-10-PHENYLISOALLOXAZINE AND 3-METHYL-10-PHENYL-5-DEAZAISOALLOXAZINE) IN THE PRESENCE OF Mg2+ ION
Authors: Fukuzumi Shunichi , Kuroda Sadaki , Tanaka Toshio
Published: July 2006

Flavin analogues (3-methyl-10-phenylisoalloxazine and 3-methyl-10-phenyl-5-deazaisoalloxazine) catalyze the photooxidation of p-methylbenzyl alcohol by oxygen in the presence of Mg2+ ion in acetonitrile to yield p-methylbenzaldehyde and hydrogen peroxide under irradiation of the visible light of λ>360 nm.
MÖSSBAUER STUDY OF ZrF4–BaF2–FeF3 GLASSES
Authors: Kawamoto Yoji , Horisaka Tamaki , Hirao Kazuyuki , Soga Naohiro
Published: July 2006

The Mössbauer spectra of ZrF4–BaF2–FeF3 glasses revealed that both Fe2+ and Fe3+ with octahedral F coordination are present in the glasses. The compositional dependence of Fe2+/(Fe2+ + Fe3+), explainable with the basicity of glass, suggests that Fe2+ and Fe3+ behave like a glass modifier and a glass former, respectively.
ANOMALOUS ORIENTATIONAL EFFECTS DURING BENZOYLOXYLATIONS BY “SILVER BROMIDE DIBENZOATE”
Authors: Bryce-Smith Derek , Isaacs Neil S , Tumi Seddeg O
Published: July 2006

The solid complex formed from bromine and silver benzoate reacts with both arenes and alkanes to form aryl and alkyl benzoates, respectively. Highly unusual substituent effects are observed in the benzoyloxylations of arenes. Electron-withdrawing groups (e.g. –NO2, –CN, –CO–) on the aromatic ring facilitate reaction though directing the attacking reagent exclusively to the meta position. In alkanes, tertiary positions are most prone to attack.
PALLADIUM CATALYZED REACTION OF ARYL BROMIDES WITH CYANOMETHYLTRIBUTYLTIN, AROMATIC CYANOMETHYLATION
Authors: Kosugi Masanori , Ishiguro Masahiro , Negishi Yoshikazu , Sano Hiroshi , Migita Toshihiko
Published: July 2006

Palladium catalyzed reaction of aryl bromides with cyanomethyltributyltin gave arylacetonitriles in moderate yields. Aryl bromides having strong electron-withdrawing groups(such as acyl, cyano, nitro, etc.) cannot be applied to the reaction.
TWO-CARBON MICHAEL ACCEPTORS. ACETYL CATION EQUIVALENTS
Authors: Kinoshita Hitoshi , Hori Isaburo , Oishi Takeshi , Ban Yoshio
Published: July 2006

Base-induced Michael condensation of chloromethoxyvinyl phenyl sulfoxides or sulfones with active methylene compounds were examined. The newly introduced functionalized substituents were converted into acetyl group by the subsequent treatment.
ENRICHMENT OF ORGANIC SOLUTES WITH HYDROPHOBIC POLYMER MEMBRANE
Authors: Igawa Manabu , Tachibana Taka-aki , Yoshida Kayoko , Tanaka Masao , Seno Manabu
Published: July 2006

Dilute aqueous solutions of aromatic hydrocarbons were permeated through a fluorocarbon polymer membrane under a pressure gradient. Some organic solutes were enriched about two fold and there was a peak in the relationship between enrichment factors and hydrophobicities of the solutes.
A FACILE SYNTHESIS OF γ,δ-UNSATURATED ESTERS BY THE Pd(II) CATALYZED CLAISEN REARRANGEMENT
Authors: Ohshima Masahiro , Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

A mixed ortho ester is prepared under mild conditions from an allyl alcohol and a ketene acetal in the presence of PdCl2(COD). The ortho ester thus formed is successively treated with a catalytic amount of PdCl2(PPh3)2 in refluxing p-xylene to afford a γ,δ-unsaturated ester in a high yield under neutral conditions.
PREPARATION OF DIBENZO-18-CROWN-6 COMPLEXES OF CADMIUM(II) AND MERCURY(II), [MX2(dbc)], AND MOLECULAR STRUCTURE OF [HgCl2 (dbc)]
Authors: Kawasaki Yoshikane , Matsuura Yoshiki
Published: July 2006

[MX2(dbc)] complexes (M= Cd and Hg, X= Cl, Br, I, CN, and SCN) were prepared by heating an equimolar mixture of MX2 and dibenzo-18-crown-6 (dbc) in acetonitrile or toluene. A linear Cl–Hg–Cl moiety was found to be held perpendicularly in a quasi-planar ring of O6 from the X-ray cryatal structure analysis.
FISCHER-TROPSCH SYNTHESIS CATALYZED BY ACTIVATED Fe POWDER GENERATED BY THE REDUCTION OF FeI2(OR FeBr2) WITH POTASSIUM
Authors: Nomura Masakatsu , Takebe Khoichiro , Miyake Mikio
Published: July 2006

Activated Fe powder prepared by the reduction of FeI2(or FeBr2) with potassium in THF solvent shows both a preferential formation of C4 hydrocarbon and a high selectivity of olefin formation in the CO hydrogenation.
A FACILE CONVERSION OF 5-TRIFLUOROMETHYL-5,6-DIHYDROURACILS TO 5-TRIFLUOROMETHYLURACILS
Authors: Fuchikami Takamasa , Yamanouchi Akiko
Published: July 2006

5-Trifluoromethyl-5,6-dihydrouracils were directly converted to the corresponding 5-trifluoromethyluracils by the reaction with copper(II) bromide in dimethylformamide/water or dimethylformamide/acetic acid in good to excellent yields.
SELECTIVE SYNTHESIS OF C2-OXYGENATED COMPOUNDS FROM SYNTHESIS GAS OVER Ir–Ru BIMETALLIC CATALYSTS
Authors: Hamada Hideaki , Kuwahara Yasushi , Kintaichi Yoshiaki , Ito Takehiko , Wakabayashi Katsuhiko , Iijima Hitoshi , Sano Ken-ichi
Published: July 2006

Silica-supported Ir–Ru bimetallic catalysts were found to produce C2-oxygenated compounds from synthesis gas at temperatures from 280 °C to 300 °C under 50 atm. The addition of Li to the bimetallic catalysts brought about improvement in catalytic activity and selectivity
SELECTIVITIES OF THE PLATINUM GROUP METALS IN DEUTERATION OF 1,2- AND 1,6-DIMETHYLCYCLOHEXENES
Authors: Nishimura Shigeo , Tsuchimoto Michiko , Ohkubo Kazuo
Published: July 2006

The deuteration of 1,2- and 1,6-dimethylcyclohexenes over the six unsupported platinum metals has been studied at 25 °C and atmospheric pressure. The stereoselectivities and the degrees of exchange in the formation of saturates have been found to be correlated.
ELECTROLYTE-INDUCED SPIN-STATE TRANSITION OF IRON IN IRON(III) PHTHALOCYANINE
Authors: Kobayashi Nagao , Koshiyama Masami , Ishikawa Yoko , Osa Tetsuo , Shirai Hirofusa , Hojo Nobumasa
Published: July 2006

Magnetic susceptibility, magnetic circular dichroism(MCD), UV-visible absorption, and ESR spectroscopy have revealed that spin state of iron in 1,2,8,9,15,16,22,23-octadecyloxycarbonylphthalocyaninatoiron(III) dissolved in CH2Cl2 or CHCl3 changes from high-spin to low-spin state by the addition of ca. 10 equiv. of tetrabutylammoniumchloride (Bu4NCl) and/or -bromide(Bu4NBr), (electrolytes).
ROLE OF LONG CONJUGATED SEGMENTS IN THE ELECTRICAL PROPERTY OF TRANS-POLYACETYLENE
Authors: Arakawa Tsutomu , Furukawa Yukio , Takeuchi Hideo , Harada Issei , Shirakawa Hideki
Published: July 2006

Raman spectra and electric conductivity of trans-polyacetylene and doped polyacetylene have been studied. A linear relationship holds between contents of long conjugated segments in pristine films and values of conductivity at their maximally iodine-doped states. At the early and intermediate doping stages an apparent correlation exists between contents of doped long segments and conductivity. Enrichment of long conjugated segments is essential to the improvement of the electrical property of trans-polyacetylene.
EFFECT OF THE MOLECULAR SIZE OF ANILINIUM COUNTER CATION ON THE 35Cl NMR LINE WIDTH OF CHLORIDE ION
Authors: Suezawa Hiroko , Kodama Tomoro , Ogino Jun-ichi , Hirota Minoru
Published: July 2006

The 35Cl NMR line width of chloride ion is shown to reflect the molecular size of anilinium counter cation by plotting the calibrated line width (Δν\frac12T⁄η) against the assumed molecular size (a3). On the basis of the concentration vs. 35Cl line width plot, specific interaction between the cation and chloride ion is concluded to exist even in aqueous solutions.
COMPLETE RETENTION OF CHIRALITY IN THE PALLADIUM CATALYZED CYCLIZATION OF METHYL (R)-3-OXO-7-(METHOXYCARBONYLOXY)-8-NONENOATE
Authors: Yamamoto Keiji , Deguchi Ryoji , Ogimura Yoshinobu , Tsuji Jiro
Published: July 2006

Optically active methyl (R)-3-oxo-7-(methoxycarbonyloxy)-8-nonenoate (1) underwent intramolecular allylation catalyzed by Pd(OAc)2-dppe in THF at room temperature to give racemic 3-vinyl-2-methoxycarbonylcyclohexanone (3), whereas similar palladium-catalyzed cyclization of a sodium salt of 1 proceeded very rapidly at 0 °C to form optically active 3, indicative of complete retention of the original chiral center.
MÖSSBAUER STUDY OF TIN IN α-Fe2O3
Authors: Ichiba Sumio , Yamaguchi Tomoharu
Published: July 2006

Natural tin was introduced into the crystal lattice of α-Fe2O3 by diffusion at 1000 °C. The 119Sn Mössbauer spectra of a well-resolved six-line due to supertransferred hyperfine magnetic field were obtained. It is insured that 2.7 mol% of natural tin was incorporated uniformly in the crystal lattice of α-Fe2O3. The Mössbauer parameters coincided with the values of the other works.
MÖSSBAUER STUDY OF KCl–ZnCl2–FeCl2 GLASSES
Authors: Nishida Tetsuaki , Nakamura Akihiro , Takashima Yoshimasa
Published: July 2006

Mössbauer spectrum of xKCl·(90−x)ZnCl2·10FeCl2 glasses (27≥x≥0) suggests that Fe2+ ions are present, as a network modifier, at interstitial sites of the three-dimensional network composed of ZnCl4 tetrahedra. A continuous decrease in the isomer shift observed with increasing KCl content is ascribed to the formation of nonbridging chlorine atoms at the neighboring sites of iron.
SYNTHESIS AND [2+2]-CYCLOREVERSION OF CAGE KETONES
Authors: Yamashita Yoshiro , Mukai Toshio
Published: July 2006

A series of pentacyclic cage ketones 2b-d having no substituent was synthesized by the photochemical [2+2]-cycloaddition reaction of corresponding tricyclic dienones 1b-d. The cage ketones 2b-d underwent thermal [2+2]-cycloreversion to give dienones 1b-d. The reactivities were dependent on the length of the bridge “X”.
PREPARATION AND IMINE-ENAMINE TAUTOMERISM OF 4,6-DIPHENYL-1,2-DIHYDROPYRIMIDINE
Authors: Weis Alexander L , Vishkautsan Rosita
Published: July 2006

4,6-Diphenyl-1,2-dihydropyrimidine was prepared by LiAlH4 reduction of 4,6-diphenylpyrimidin-2(1H)-one or 4,6-diphenylpyrimidine. Using 1H and 13C NMR, it was shown that in CDCl3 the product exists in tautomeric equilibrium with 4,6-diphenyl-2,5-dihydropyrimidines.
SELECTIVE SYNTHESIS OF AROMATIC HYDROCARBONS FROM SYNTHESIS GAS
Authors: Saima Hitoshi , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

Aromatic hydrocarbons, whose major components were penta- and hexa- methyl benzenes, were produced with the selectivity of 27% from synthesis gas at 350 °C and under 21 atm with hybrid catalysts containing Pd/SiO2 catalyst and high silica mordenites. Steam treatment of the high silica mordenite, which cause the hydration, promoted the selectivity of aromatic hydrocarbons and suppressed dramatically the coke producing ability of the hybrid catalyst upon synthesis gas conversion.
LEWIS ACID CATALYZED RACEMIZATION OF CHRYSANTHEMOYL CHLORIDE
Authors: Suzukamo Gohfu , Fukao Masami , Nagase Tsuneyuki
Published: July 2006

The facile racemization of chrysanthemic acid was achieved by treatment of chrysanthemoyl chloride with a catalytic amount of Lewis acid followed by hydrolysis. The reaction mechanism is also proposed.
A NEW METHOD FOR NUCLEOPHILIC OXYMETHYLATION USING α-ALKOXYSlLANES. SYNTHESIS OF UNSYMMETRICAL 1,2-DIOLS
Authors: Tsuge Otohiko , Kanemasa Shuji , Nagahama Hideki , Tanaka Junji
Published: July 2006

Desilylation of α-alkoxysilanes offers the convenient generation of carbinyl carbanions which react with a variety of carbonyl compounds giving mono-protected 1,2-diols of unsymmetrical type. Dehydration of these unsymmetrical diols leads to the regioselective formation of methyl ketones.
SELECTIVE N-METHYLATION OF PEPTIDE BOND. PREPARATION AND PROPERTIES OF [MeOrn2,2′, d-MePhe4,4′]GRAMICIDIN S
Authors: Kawai Masao , Ohya Masashi , Butsugan Yasuo , Saito Kazuki , Higashijima Tsutomu
Published: July 2006

Diphthaloyl derivative of gramicidin S was subjected to selective N-methylation using CH3I–Ag2O in DMF. Methylation occurred exclusively at ornithine and d-phenylalanine residues affording tetra-N-methylated product in high yield. Removal of the phthaloyl groups furnished the title compound, which showed essentially the same antimicrobial activity as gramicidin S itself.
SUPPORT EFFECT ON THE HYDROCRACKING ACTIVITY OF MOLYBDENUM CATALYSTS
Authors: Shimada Hiromichi , Kurita Minoru , Sato Toshio , Yoshimura Yuji , Hirata Takahiro , Konakahara Takeo , Sato Kenji , Nishijima Akio
Published: July 2006

Hydrocracking reactions of diphenylmethane under high H2 pressure were carried out to elucidate the requisite properties of the support for molybdenum catalysts. The effectiveness order of the supports was TiO2 > SiO2 > ZrO2 > γ-Al2O3 > MgO.
DUAL PHOTOREACTIONS OF PHTHALAZINE FROM THE LOWEST EXCITED SINGLET AND TRIPLET STATES
Authors: Sano Ryo , Inoue Hiroyasu
Published: July 2006

Phthalazine undergoes the photoreduction and the photo-reductive dimerization simultaneously to give 1,2-dihydrophthalazine and its dimer (1H,1′H,2H,2′H-1,1′-biphthalazine), respectively, upon ultraviolet light irradiation in 2-propanol. It has been suggested that the photoreduction proceeds through the lowest excited singlet state and the photodimerization through the lowest triplet state.
SYNTHESIS OF OPTICALLY PURE (R)- AND (S)-5-n-HEXADECANOLIDE. A PROPOSED PHEROMONE COMPONENT FROM ORIENTAL HORNET
Authors: Kikukawa Tadashi , Tai Akira
Published: July 2006

Optically pure (R)- and (S)-5-n-hexadecanolide have been easily prepared by the reaction between optically active 1-bromo-3-tetrahydropyranyloxytetradecane (5) and lithium α-lithioacetate and the following lactonization. 5 was derived from optically pure 3-hydroxytetradecanoic acid obtained by the method reported before.
FLUORIDE INDUCED ALKYLATION OF α-SILOXYAMINES. A NEW METHOD FOR TRANSALKYLATION OF TERTIARY AMINES VIA THEIR N-OXIDES
Authors: Tokitoh Norihiro , Okazaki Renji
Published: July 2006

α-Siloxyamines obtained from tertiary amines via their N-oxi-des react with alkyl halides to give the corresponding α-siloxyammonium salts, which can be converted into new tertiary amines by fluoride induced desilylation reaction.
REGIOSELECTIVE PREPARATION OF KINETIC TRIMETHYLSILYL ENOL ETHERS FROM β-KETO SILANES
Authors: Yamamoto Yohsuke , Ohdoi Keisuke , Nakatani Masayuki , Akiba Kin-ya
Published: July 2006

Kinetic trimethylsilyl enol ethers were prepared regioselectively by the two-step method, i.e., trimethylsilyl triflate catalyzed rearrangement of β-keto silanes which were prepared from trimethylsilylmethylcopper and acid chlorides.
REACTIONS OF BENZENE VAPOR-CALCIUM ATOM WITH ORGANIC HALIDES AND CARBONYL COMPOUNDS
Authors: Mochida Kunio , Takeuchi Hidenori , Hiraga Yoo , Ogawa Hiroyasu
Published: July 2006

Reactions of benzene vapor-calcium atom with organic halides and carbonyl compounds were examined. Benzene vapor-calcium atom reacted with organic halides (RX) to give phenyl-substituted products (PhR) and reduced products (RH). The reactions of benzene vapor-calcium atom with ketones (RR′CO) or benzaldehyde gave two kinds of alcohol PhRR′COH and RR′CHOH, or Ph2CHOH and PhCH2OH, respectively
A NEW SYNTHETIC ROUTE OF β-HYDROXYALKYLPHOSPHONATES FROM β,γ-EPOXYALKYLPHOSPHONATES
Authors: Nagase Toshio , Kawashima Takayuki , Inamoto Naoki
Published: July 2006

β-Hydroxyalkylphosphonates were synthesized from β,γ -epoxyalkylphosphonates and RMgX/ cat. CuI reagents, which is a new synthetic route for the various types of α- and/or γ-substituted β-hydroxyalkylphosphonates.
EFFECTS OF SOLVENT MOLECULES ON THE d-d TRANSITION SPECTRUM OF POTASSIUM ETHYLENEDIAMINETETRAACETATOCOBALTATE(III)
Authors: Taura Toshiaki
Published: July 2006

The absorption spectra of the title compound were measured in a variety of solvents. It was found that the peak position (λmax) of the first d-d absorption band is strikingly influenced by solvent molecules. The magnitude of this influence could be estimated by using the acceptor numbers of the solvents.
SYNTHESIS OF ZINC OXIDE POWDER BY HYDROLYSIS OF BIS(ACETYLACETONATO)ZINC(II) IN AQUEOUS SOLUTION
Authors: Kamata Kiichiro , Hosono Hirotsugu , Maeda Yuji , Miyokawa Kikuo
Published: July 2006

Pure and fine powder of zinc oxide was prepared by hydrolysis of bis(acetylacetonato)zinc(II) in methanol–water mixture. A significant difference in the particle shape was observed by TEM between ZnO powders prepared at 25 and 80 °C.
REACTIONS AND CATALYTIC PROPERTIES OF RARE EARTH METALS WITH UNSATURATED COMPOUNDS: SAMARIUM AND YTTERBIUM CATALYSTS FORMED IN LOW-TEMPERATURE MATRICES
Authors: Imamura Hayao , Ohmura Akira , Tsuchiya Susumu
Published: July 2006

Active samarium and ytterbium catalysts were prepared by dispersing rare earth atoms in frozen organic matrices at −196 °C. They exhibited specific properties for the hydrogenation of ethylene, and buta-1,3-diene in which trans-but-2-ene was selectively formed by 1,4-addition. Enhanced isomerization activity of methylacetylene to allene was also observed.
THE OXIDATION OF 2-CYCLOHEXEN-1-ONES TO 2-CYCLOHEXENE-1,4-DIONES
Authors: Freer Vernon J , Yates Peter
Published: July 2006

Treatment of 5,5-dimethyl-2-cyclohexen-1-one and isophorone with phosphomolybdic acid, potassium dichromate, cupric sulfate, and air gives 5,5-dimethyl- and 3,5,5-trimethyl-2-cyclohexene-1,4-dione, respectively. In the latter reaction treatment of the crude product with aqueous base leads to the formation of 2,3,6,7-tetrahydro-2,2,6,6,-tetramethylanthracene-1,4,5,8-tetrone.
HIGH REGIOSELECTIVITIES IN 1,3-CYCLOADDITION OF INTERMEDIARY CARBANIONS PROMOTED BY TETRABUTYLAMMONIUM FLUORIDE AND AZOMETHINE YLIDE CATALYZED BY TRIFLUOROACETIC ACID
Authors: Achiwa Kazuo , Imai Nobuyuki , Motoyama Tadashi , Sekiya Minoru
Published: July 2006

Tetrabutylammonium fluoride catalytically induced a regioselective 1,3-cycloaddition of the carbanions leading to 2,2,4-substituted pyrrolidines. And in the presence of trifluoroacetic acid, the corresponding 2,2,3-substituted products were regioselectively obtained via the intermediary azomethine ylide.