bluuebunny/crossref_metadata_2025 huggingface dataset:
COPPER BINDING SITE IN SERUM AMINE OXIDASE TREATED WITH SODIUM DIETHYLDITHIOCARBAMATE
Authors: Suzuki Shinnichiro , Sakurai Takeshi , Nakahara Akitsugu , Oda Osamu , Manabe Takashi , Okuyama Tsuneo
Published: July 2006

The structure of copper binding site in bovine serum amine oxidase (BSAO) treated with diethyldithiocarbamate ion(DDC) was discussed by comparing its absorption and electron spin resonance spectra with those of a model copper complex. The structure of the model complex, [Cu(2,2′-bipyridine)(DDC)]+, suggested that at least two nitrogen atoms are coordinated around the copper ion in the native BSAO. Some organic chromophore from which the pink color of BSAO stems was also observed as the difference of the absorption spectra in the region of 450 to 600 nm between BSAO-DDC and the model complex.
IN-BEAM ELECTRON IMPACT, CHEMICAL IONIZATION AND NEGATIVE ION CHEMICAL IONIZATION OF FLAVONOID GLYCOSIDES
Authors: Itokawa Hideji , Oshida Yoshiaki , Ikuta Akira , Shida Yasuo
Published: July 2006

There has been little information that the molecular weights of flavonoid glycosides were measured by conventional mass spectrometry. The application of other soft ionizations such as in-beam El, CI and NICI except for the FD was studied, and good spectra were given by the in-beam NICI method.
A VERY SIMPLE SYNTHESIS OF NATURAL SATURATED δ-SUBSTITUTED δ-LACTONES. THE PHEROMONE OF Vespa orientalis
Authors: Bacardit Ramón , Moreno-Mañas Marcial
Published: July 2006

Very facile syntheses of racemic massoia lactone and the pheromone of Vespa oriental is have been achieved starting from dehydroacetic acid.
REITERATIVE THIO-CLAISEN REARRANGEMENT USING A THIOLACTAM SUBSTRATE
Authors: Takano Seiichi , Hirama Michiyasu , Ogasawara Kunio
Published: July 2006

A thiolactamd(1) undergoes facile reiterative thio-Claisen rearrangement to give the α,α-disubstituted lactams with a variety of allyl groups.
OXIDIZING POWER AS THE PRIME FACTOR CONTROLLING THE CATALYTIC ACTIVITY OF H3PWxMo12−xO40 FOR OXIDATION OF METHACROLEIN
Authors: Misono Makoto , Komaya Takashi , Sekiguchi Hiroshi , Yoneda Yukio
Published: July 2006

Oxidation of acrolein, methacrolein, and isobutyric acid by 12-heteropoly acids of Mo and W (H3PWxMo12−xO40: x = 0,2,6,10,12) was carried out with a pulse method. By the comparison of the pulse and flow experiments, it was concluded that the prime factor controlling the catalytic activity was the oxidizing power of catalyst (or reducibility of catalyst).
TRANSANNULAR CYCLIZATION OF [1(10)E,4Z]-3β,8β-DIHYDROXY-13-METHOXY-1(10),4-GERMACRADIENO-12,6α-LACTONE. FORMATION OF CADINANE-TYPE LACTONES
Authors: Toma Kazunori , Murae Tatsushi , Takahashi Takeyoshi
Published: July 2006

On treatment with boron trifluoride etherate, [1(10)E,4Z]-3β,8β-dihydroxy-13-methoxy-1(10),4-germacradieno-12,6α-lactone (1) gave five cadinane-type 12,8β-lactones by transannular cyclization and concomitant lactonization with the C-8 hydroxyl group. Some of the cadinane-type lactones were also formed by thermal reaction of 1.
SYNTHESIS OF C-TERMINAL HEPTAPEPTIDE ANALOGS OF SUBSTANCE P: THE SUBSTITUTION OF GLUTAMINE BY GLYCINE OR 5-AMINOVALERIC ACID
Authors: Torigoe Keisuke , Katayama Takayoshi , Sofuku Shosuke , Muramatsu Ichiro
Published: July 2006

C-Terminal heptapeptide analogs of substance P, in which the glutaminyl residues were substituted by Gly or δAva, were synthesized by the liquid phase method. These analogs showed substance P activity. The results suggest that glutaminyl residues are not essential for the intrinsic activity on a guinea-pig ileum.
STEREOSELECTIVE SYNTHESIS OF (±)-INTEGERRINECIC ACID
Authors: Narasaka Koichi , Uchimaru Tadafumi
Published: July 2006

A synthesis of (±)-integerrinecic acid, an acid part of 12-membered bislactonic pyrrolizidine alkaloid, has been achieved stereoselectively starting from 2-methyl-2-cyclopentenone.
CATALYTIC ELECTROREDUCTION OF MOLECULAR OXYGEN AT GLASSY CARBON ELECTRODES MODIFIED WITH IRON PORPHYRINS
Authors: Kobayashi Nagao , Fujihira Masamichi , Osa Tetsuo , Dong Shaojun
Published: July 2006

The reduction of molecular oxygen (O2) at glassy carbon surfaces modified with iron porphyrins was studied by cyclic voltammetry and differential pulse polarography in 0.05 mol dm−3 aqueous H2SO4 solution. O2 was reduced more effectively at the electrode modified with iron porphyrin lying in parallel to the electrode surface than at the one with iron porphyrin protruding vertically from the surface.
SYNTHESIS OF VICINALLY SUBSTITUTED CYCLOPENTENE DERIVATIVE VIA CYCLOADDITION OF METHYL(PHENYL(OR TERT-BUTYL)THIOMETHYL)KETENE
Authors: Ohshiro Yoshiki , Ishida Masaru , Shibata Jun-ichi , Minami Toru , Agawa Toshio
Published: July 2006

Cycloaddition of methyl(phenyl(or tert-butyl)thiomethyl)ketene to cyclopentadiene gave a bicyclic cyclobutanone derivative which was further transformed to cyclopentene systems having alkenyl and carbonyl substituents at vicinal positions.
CHARACTERISTIC BEHAVIOR OF N-(PHENYLSULFONYL)BENZOHYDRAZONOYL AZIDE. BASE-INDUCED DECOMPOSITION TO BENZONITRILE AND CYCLIZATION TO A TETRAZOLE
Authors: Ito Suketaka , Tanaka Yumo , Kakehi Akikazu
Published: July 2006

N-(Phenylsulfonyl)benzohydrazonoyl azide decomposed to give benzonitrile on treatment with triethylamine at room temperature, and cyclized to 5-pnenyl-1-(phenylsulfonyl)aminotetrazole on heating in benzene, along with the formation of benzonitrile and other products.
1,4-ADDITION REACTION OF NON-ALLYLIC SULFONYL CARBANION WITH CYCLOPENTENONE DERIVATIVE IN THE PRESENCE OF HMPA. SYNTHESIS OF 15-KETO PROSTAGLANDIN F1
Authors: Nokami Junzo , Ono Toshio , Kurihara Hideyuki , WaKabayashi Shoji
Published: July 2006

1,4-Addition reaction of aliphatic (non-allylic) sulfonyl carbanion to cyclopentenone derivative was studied to build the vinyl ketone function at the β position of the carbonyl of cyclopentenone. 15-Keto PG F1 (6) was synthesized from sulfone ketal 1 and cyclopentenone derivative 2.
OXYGEN EVOLUTION BY WATER OXIDATION WITH TRIS(2,2′-BIPYRIDYL)RUTHENIUM(III) COMPLEX
Authors: Kaneko Masao , Awaya Nobuhiko , Yamada Akira
Published: July 2006

Oxygen evolution by water oxidation with tris(2,2′-bipyridyl)ruthenium(III) complex was studied by mass spectrum, gas chromatography, visible spectrum, and volumetric method. It was confirmed that water is oxidized to give dioxygen. A model for water oxidation through Ru(bpy)32+ was studied.
AN ENANTIOSELECTIVE ROUTE TO AN INTERMEDIATE OF THE CARBAPENAM SYSTEM FROM THE CHIRAL γ-BUTYROLACTONE
Authors: Takano Seiichi , Kasahara Chiyoshi , Ogasawara Kunio
Published: July 2006

A new enantioselective synthesis of the keto ester(16) containing β-lactam ring system has been developed using the chiral lactone(1) as a starting material.
USE OF UNCHARGED NEUTRAL LIGANDS IN THE ISOTACHOPHORETIC ANALYSIS OF ALKALI AND ALKALINE EARTH METALS
Authors: Tazaki Masato , Takagi Makoto , Ueno Keihei
Published: July 2006

The use of uncharged complexing agent in the isotachophoretic separation of ions is described. 18-Crown-6 interacted with ammonium and some alkali and alkaline earth metal ions, improving the separation among these ions. α-Cyclodextrin assisted the separation of anions through a host–guest interaction.
A CONVENIENT METHOD FOR THE PREPARATION OF N,N′-DISUBSTITUTED THIOUREAS USING 2-CHLOROPYRIDINIUM SALT, SODIUM TRITHIOCARBONATE AND AMINES
Authors: Takikawa Yuji , Inoue Noriyuki , Sato Ryu , Takizawa Saburo
Published: July 2006

N,N′-Disubstituted thioureas were prepared in high yields by treating 2-chloropyridinium salt with sodium trithiocarbonate and subsequently adding amines.
PERFLUOROALKYLATION OF THIOLS WITH RfI (Ph) OSO2CF3
Authors: Umemoto Teruo , Kuriu Yuriko
Published: July 2006

Perfluoroalkylation of various thiols with perfluoroalkylphenyliodonium trifluoromethanesulfonates (FITS) under mild conditions was described.
HYDROXYLATION OF BENZENE BY HYDROGEN PEROXIDE CATALYZED BY AN Fe3+-CATECHOL CATALYST SUPPORTED ON SILICA GEL
Authors: Tamagaki Seizo , Hotta Kazuhiko , Tagaki Waichiro
Published: July 2006

A silica gel-supported Fe3+-catechol catalyst was found to be active to convert benzene to phenol in moderate yields.
ALKALINE HYDROLYSIS OF A p-NITROPHENYL ESTER CATALYZED BY PROTEIN–SURFACTANT COMPLEXES
Authors: Koga Joichi , Chen Keng-Ming , Nawata Masahiro , Yamazaki Yoshihiro , Kuroki Nobuhiko
Published: July 2006

The large enhancement in the rate of alkaline hydrolysis of p-nitrophenyl hexanoate in aqueous solutions of tetradecyltrimethylammonium bromide in the presence of bovine serum albumin was found. A maximum in the rate enhancement appeared in the vicinity of the critical micelle concentration of the surfactant. It was suggested that the rate enhancement was attributable to the formation of protein–surfactant complexes providing a new pseudo-phase for the reaction.
A NOVEL STEREOCHEMICAL ASPECT OF NITRO SUGAR DERIVATIVES: “AXIAL” NITRO GROUP PREDOMINATED OVER EQUATORIAL ONE IN EQUILIBRIUM
Authors: Sakakibara Tohru , Minami Toshiaki , Ishido Yoshiharu , Sudoh Rokuro
Published: July 2006

2-Nitro sugar derivatives bearing an axial nitro group were proved to be thermodynamically more stable than the corresponding 2-epimers, bearing an equatorial nitro group.
SELECTIVE CATALYTIC HYDROGENATION OF PROPARGYL ALCOHOL WITH HETEROPOLY ACID-MODIFIED PALLADIUM
Authors: Izumi Yusuke , Tanaka Yoshiyuki , Urabe Kazuo
Published: July 2006

The Keggin type heteropoly acid was readily reduced with hydrogen in the aqueous phase at 30°C in the presence of Pd(II) or metallic Pd, taking up 1 to 11 molecules of hydrogen per Keggin unit. The palladium catalyst prepared by the H2-reduction of an aqueous solution containing Pd(II) and heteropoly acid was very effective for the aqueous-phase selective semihydrogenation of propargyl alcohol.
AN ION-FLOTATION METHOD FOR EVALUATING THE INTERACTION OF ZINC ION WITH HUMIC ACID
Authors: Sugawara Masao , Saito Shigeru , Kambara Tomihito
Published: July 2006

An ion-flotation technique by using a surface-active cetylpyridinium chloride (CPC) in conjunction with spectrophotometry was found to be a useful method for evaluating the degree of interaction of zinc(II) with soil-derived humic acid.
THE CONDENSATION OF p-TROPOQUINONES WITH 5-HYDROXYTROPOLONE: A “PHENOL OXIDATION REACTION” IN THE TROPONOID SYSTEM
Authors: Takeshita Hitoshi , Kusaba Tomoyuki , Mori Akira
Published: July 2006

Condensation of p-tropoquinones and 5-hydroxytropolones, preferably by acid, yielded dicycloheptafurandione derivatives, which have the same carbon framework with utahin, a naturally-occurring dimeric tropolone. Partial oxidation of 5-hydroxytropolones and partial reduction of p-tropoquinones respectively yielded the condensates. This should exemplify the “phenol oxidation” in troponoids.
REGIOSELECTIVITY OF β-VINYL-β-PROPIOLACTONE TOWARD VARIOUS NUCLEOPHILES
Authors: Fujisawa Tamotsu , Sato Toshio , Takeuchi Masashi
Published: July 2006

Regioselectivity in the reaction of β-vinyl-β-propiolactone with various nucleophiles was found to depend on the hard and soft acid and base (HSAB) principle. A hard base such as methoxide ion attacked the acyl carbon exclusively, while the nucleophilic attack of soft bases such as iodide and dialkyl cuprate preferred the terminal vinyl carbon to the β-carbon.
CATALYTIC ACTIVITIES OF ALKALINE EARTH METAL OXIDES FOR DISPROPORTIONATION OF NITROGEN MONOXIDE
Authors: Kanno Yoshinori , Imai Hisao
Published: July 2006

The disproportionation of nitrogen monoxide over alkaline earth metal oxides was carried out at 0°C. The catalysts were found to exhibit high activity for the formation of dinitrogen oxide from nitrogen monoxide. The order of the catalytic activity per unit surface area was obtained as MgO> CaO> SrO> BaO.
SYNTHESIS OF Dl-VALIDOXYLAMINE A
Authors: Ogawa Seiichiro , Ogawa Takao , Chida Noritaka , Toyokuni Tatsushi , Suami Tetsuo
Published: July 2006

The first total synthesis of Dl-validoxylamine A, one of the components of the antibiotic validamycin complex, is described.
HYDRIDING BEHAVIORS OF ZrxTi1−x(FeyMn1−y)z ALLOYS
Authors: Suzuki Akira , Nishimiya Nobuyuki , Ono Shuichiro , Higano Sakae , Kamino Kimiyuki
Published: July 2006

ZrxTi1−x(Fey Mn1−y)z alloys, where x and y are 0 to 1 and z is 1 to 2, are found to have practically promising characteristics that their hydrogen equilibrium pressures can be adjusted to 0.1 to 1 MPa at about 400K by varying the three parameters.
ABSORPTION OF DIHYDROGEN BY [Fe4S4(SPh)4]2− AND [Mo2Fe6S8(SPh)9]3−, AND THE H–D EXCHANGE REACTION BETWEEN H2 AND D2 CATALYZED BY THE REDUCED SPECIES OF THESE CLUSTERS
Authors: Tanaka Masahiro , Tanaka Koji , Tanaka Toshio
Published: July 2006

Two and four molar amounts of H2 can be absorbed quantitatively by [Fe4S4(SPh)4]2− and [Mo2Fe6S8(SPh)9]3−, respectively, in dimethylformamide, and the H2-absorbed clusters exhibit the metal-hydride stretching bands in the matrix of polyvinylchloride films. Moreover, the reduced species of the clusters prepared chemically or electrochemical ly catalyze the H–D exchange reaction between H2 and D2. The active species for the catalytic reaction are shown to be [Fe4S4(SPh)4]4− and [Mo2Fe6S8(SPh)9]5−.
RING OPENING OF CYCLOPROPYL KETONES ASSISTED BY THE TRIMETHYLSILYL GROUP
Authors: Ochiai Masahito , Sumi Kenzo , Fujita Eiichi
Published: July 2006

Cyclopropyl ketones 2 were smoothly cleaved with boron trifluoride-acetic acid under mild reaction conditions by the assistance of trimethylsilyl group to give γ,δ-enones in good yields and the reaction was applied to the formal total synthesis of cis-jasmone.
PREPARATION OF NEW PHTHALOCYANINE COMPLEXES OF SOME RARE-EARTH ELEMENTS
Authors: Sugimoto Hiroshi , Higashi Teruaki , Mori Masayasu
Published: July 2006

The reaction of tris(1,3-diphenyl-1,3-propanedionato) complexes of heavier rare-earth elements, M3+(dbm)3 and lithium phthalocyaninato(2−), Li2(pc) gave two types of new stable phthalocyanine complexes, [M3+(pc) (dbm) (dbmH)] and [M3+(pc) (dbm)] depending on the solvents used for the preparation. The structure of both types of complexes are tentatively proposed.
NOVEL CONVERSION OF A KETONE DIMETHYL DITHIOACETAL S,S-DIOXIDE TO THE CORRESPONDING KETONE AND ITS APPLICATION TO SYNTHESIS OF ACYCLIC AND CYCLIC KETONES
Authors: Ogura Katsuyuki , Suzuki Michiyo , Watanabe Jun-ichi , Yamashita Mitsuo , Iida Hirotada , Tsuchihashi Gen-ichi
Published: July 2006

A ketone dimethyl dithioacetal S,S-dioxide was easily hydrolyzed with hydrochloric acid in refluxing methanol and this transformation was applied to a new method for making acyclic and cyclic ketones by the use of formaldehyde dimethyl dithioacetal S,S-dioxide.
DIMERIZATION OF ALKYL VINYL KETONES WITH SODIUM NITRITE-ACETIC ACID IN DIMETHYL SULFOXIDE
Authors: Miyakoshi Tetuo , Saito Shojiro , Kumanotani Ju
Published: July 2006

Dimerization of alkyl vinyl ketones in the presence of a catalytic amount of sodium nitrite-acetic acid in DMSO gave the corresponding 1,6-diketones in 58–86% yield.
REACTIONS OF CYCLIC ENAMINES WITH DICYANOMETHYLENECYCLOPROPENES. FORMATION OF MEDIUM RING COMPOUNDS AND TRANSANNULATION TO FULVENES
Authors: Tsuge Otohiko , Okita Shigeru , Noguchi Michihiko , Kanemasa Shuji
Published: July 2006

Several cyclic enamines with five to seven-membered rings react with 2-(1,2-diphenyl-3-cyclopropenylidene)propanedinitrile to give medium ring compounds, showing that the latter is a versatile reagent which can insert three carbon atoms between α- and β-carbons of cyclic enamines. These medium ring compounds undergo transannular reactions on treatment with hydrochloric acid to yield fulvene derivatives with the elimination of an amine component in the enamine.
CHROMATOGRAPHIC RESOLUTION OF TRIS(ACETYLACETONATO)COBALT(III) ON A Δ-TRIS(1,10-PHENANTHROLINE)NICKEL(II) MONTMORILLONITE COLUMN
Authors: Yamagishi Akihiko , Ohnishi Ryuichiro , Soma Mitsuyuki
Published: July 2006

Tris(acetylacetonato)Co(III) was partially resolved on a 2.5×1.5 cm o.d. chromatographic column of Δ-tris(1,10-phenanthroline)Ni(II) montmorillonite at 2°C. The percentage resolution of Λ-tris(acetylacetonato)Co(III) was attained to be 36% for the first eluted fraction.
KINETIC STUDY ON TWO TYPES OF NOVEL INTRAMOLECULAR REARRANGEMENTS OF HEPTA-COORDINATE OXOMOLYBDENUM(IV) COMPLEXES: MoO(S2CNEt2)2(EtOOCN=NCOOEt) AND MoO(S2CSPri)2(MeOOCC≡CCOOMe)
Authors: Kashiwagi Tohru , Tanaka Koji , Tanaka Toshio
Published: July 2006

A kinetic study reveals that the reaction of MoO(S2CNR2)2 with ROOCN=NCOOR (R = Me, Et) proceeds via two successive steps which consist of the formation of a mono-capped trigonal prismatic intermediate followed by intramolecular rearrangement, affording the final product with a pentagonal bipyramidal configuration. The entropy and the volume of activation in the rearrangement (R=Et) are both positive (ΔS\eweq=+38.0 J mol−1K−1, ΔV\eweq=+13.6 cm3mol−1), which are in marked contrast to the negative values for a similar rearrangement of MoO(S2CSPri)2(MeOOCC≡CCOOMe) (ΔS\eweq=−83.5 J mol−1K−1, ΔV\eweq=−9.9 cm3mol−1). Based on these results, two different mechanisms are suggested for the intramolecular rearrangement of hepta-coordinate molybdenum complexes.
BIOMIMETIC SHORT-STEP SYNTHESIS OF (±)-CASBENE FROM GERANYLGERANIOL
Authors: Toma Kazunori , Miyazaki Eiji , Murae Tatsushi , Takahashi Takeyoshi
Published: July 2006

(±)-Casbene was synthesized from all-trans geranylgeraniol by a route involving intramolecular carbene-olefin cyclization.
DOUBLE CARBONYLATION REACTIONS OF METHYL- AND PHENYLPALLADIUM(II) COMPLEXES IN THE PRESENCE OF SECONDARY AMINES AFFORDING α-KETO AMIDES
Authors: Ozawa Fumiyuki , Yamamoto Akio
Published: July 2006

The reactions of trans-PdR(X)(PMePh2)2 (R = Me, X = I and R = Ph, X = Br) with carbon monoxide in the presence of secondary amines, R’2NH, were found to give α-keto amides, RCOCONR’2, as double carbonylation products under mild conditions in good yields and selectivities.
CONSECUTIVE 1,3-DIPOLAR CYCLOADDITIONS OF CYCLOIMMONIUM YLIDES TO BENZYNE: FORMATION OF NOVEL 18π BENZO[a]ISOINDOLO[1,2,3-cd]INDOLIZINES
Authors: Matsumoto Kiyoshi , Uchida Takane , Sugi Takazumi , Yagi Yoshiko
Published: July 2006

Benzo[a] isoindolo [1,2,3-cd]indolizines, a novel kind of 18π heterocycles, have been prepared by one pot successive 1,3-dipolar cycloadditions of pyridinium dicyanomethylides with benzyne.
DECARBOXYLATION OF SODIUM GLYCIDATES: A CONVENIENT METHOD FOR THE SYNTHESIS OF α-ACETOXYKETONES, α-DIKETONES, AND α-KETOESTERS
Authors: Reutrakul Vichai , Srikirin Yupayao , Panichanun Sirichai
Published: July 2006

The decarboxylation of aryl sodium glycidates having substituent at the α-carbon gave the corresponding α-acetoxyketones, α-diketones and α-ketoesters in synthetically useful yields.
THE ABSOLUTE CONFIGURATION OF DIARYLHEPTANOID XYLOSIDE, OREGONIN, ISOLATED FROM THE FEMALE FLOWERS OF ALNUS SERRULATOIDES
Authors: Suga Takayuki , Ohta Shinji , Hirata Toshifumi , Aoki Tadashi
Published: July 2006

It was found that (−)-diarylheptanoid xyloside isolated from the female flowers of Alnus serrulatoides is 1,7-bis(3,4-dihydroxyphenyl)-5-(β-d-xylopyranosyloxy)-3-heptanone, and its spectral data and chemical behaviors coincides perfectly with those of previously reported oregonin whose absolute configuration had not been clarified yet. Then, the absolute configuration of the diarylheptanoid xyloside was investigated by a combination of the 13C NMR spectroscopy and the X-ray crystallography, and established to be s.
ASYMMETRIC SYNTHESIS OF OPTICALLY ACTIVE CYCLOHEXENOL DERIVATIVES VIA HIGHLY STEREOSELECTIVE REDUCTION OF (R)-3-(p-t-BUTYLPHENYLTHIO) CYCLOHEXAN-1-ONE
Authors: Suzuki Keisuke , Ikegawa Akihiko , Mukaiyama Teruaki
Published: July 2006

(R)-3-(p-t-Butylphenylthio)cyclohexan-1-one was reduced with LiAlH(OBut)3 to afford (1S,3R)-3-(p-t-butylphenylthio)cyclohexan-1-o1, while the same reduction with LiBH(s-Bu)3 afforded the (1R,3R) counterpart almost exclusively. Elaboration of each product furnished both enantiomers of optically pure cyclohexenol derivatives.
CHEMO- AND REGIOSELECTIVITIES IN ACID-CATALYZED RING EXPANSION OF 1-[1-METHYLSULFINYL-1-(METHYLTHIO)ALKYL]CYCLOBUTANOL DERIVATIVES
Authors: Ogura Katsuyuki , Yamashita Mitsuo , Suzuki Michiyo , Tsuchihashi Gen-ichi
Published: July 2006

A new ring expansion of the title compounds catalyzed by an acid was studied. The reaction of 2-methyl-1-[1-methylsulfinyl-1-(methylthio)alkyl]cyclobutanol was regio- and chemoselective to afford 3-methyl-2-(methylthio)cyclopentanone derivative.
PREPARATION OF MONOPHENYLTHALLIUM(III)DIBENZO-18-CROWN-6 COMPLEXES WITH A SOFT LIGAND: [C6H5Tl(DBC)X]ClO4
Authors: Kawasaki Yoshikane , Yokota Wataru , Enomoto Norihide
Published: July 2006

Monophenylthallium(III) complexes with a Tl–I or Tl–SR bond were prepared in the presence of dibenzo-18-crown-6. These complexes are stable in the air and to heat to their melting points. In the hydrogen sulfide complex, ν(S–H) band was found at 2570 cm−1 and δ(Tl–SH) was observed at 1.15 ppm with 2J(Tl-SH) = 405 Hz in CH2Cl2 solution.
REGIOSELECTIVE COPE REARRANGEMENT OF [2+2] CYCLOADDUCT OF 2-PHENYL-2-(1,2-DIPHENYL-3-CYCLOPROPENYLIDENE)ACETONITRILE TO AN ENAMINE LEADING TO PENTALENE DERIVATIVES
Authors: Tsuge Otohiko , Okita Shigeru , Noguchi Michihiko , Kanemasa Shuji
Published: July 2006

The reaction of 2-phenyl-2-(1,2-diphenyl-3-cyclopropenylidene)acetonitrile with 1-(1-pyrrolidinyl)acenaphthylene giving two isomeric tetrahydroindeno[1′,2′]cyclopenta[4,5-a]acenaphthylenes is the first example in which a phenyl group on the methylenecyclopropene ring took part in a cyclization: They are presumed to form via the regioselective Cope rearrangement of initially formed endo [2+2] cycloadducts followed by a hydrogen shift.
THE STRUCTURE OF POTAMOGETONIN
Authors: Hasegawa Shinichi , Hirose Yoshiyuki
Published: July 2006

By conversion of methyl 15,16-epoxy-20-oxo-8(17),13(16),14 labdatrien-19-oate (3) into 15,16-epoxy-8(17),13(16),14-labdatrien-19,20-olide (1) and 15,16-epoxy-8(17),13(16),14-labdatrien-20,19-olide (8), the structure of potamogetonin was proved to be 15,16-epoxy-8(17),13(16),14-ent-labdatrien-20,19-olide (10), not 1 as proposed by Smith et al.
HIGH EFFICACY OF SHORT CONTACT TIME PROCEDURE AT HIGH TEMPERATURE IN THE HYDROGEN TRANSFERRING LIQUEFACTION OF BROWN COAL
Authors: Mochida Isao , Otani Kazumasa , Korai Yozo , Fujitsu Hiroshi
Published: July 2006

Hydrogen transferring liquefaction of an Australian brown coal using pyrene hydrogenated with Li-ethylenediamine or a Ni–Mo catalyst is found very efficient to convert the coal hexane-soluble as well as benzene-soluble at yields as high as 70% and 90%, respectively, under the conditions of short contact time(1.5 min) at high temperatures (490–510°C). The structural differences of hydropyrenes are briefly discussed in relation with their performance in the liquefaction process of the present kind.
A NEW PROTECTING TACTICS FOR THE URACIL RESIDUE IN OLIGORIBONUCLEOTIDE SYNTHESIS
Authors: Kamimura Takashi , Masegi Tsukio , Urakami Ken-ichi , Honda Shinkichi , Sekine Mitsuo , Hata Tsujiaki
Published: July 2006

Four kinds of acyl groups as protecting group for the uracil imide functionhave been examined. Among them, the anisoyl group was found to be most promissing and used to demonstrate the synthesis of the dimer, UpUp.
SYNTHESIS AND EPIMERIZATION OF 11b-SUBSTITUTED-INDOLIZINO[8,7-b]INDOLE-5-CARBOXYLIC ACID METHYL ESTERS
Authors: Irikawa Hajime , Okumura Yasuaki
Published: July 2006

The methoxide-catalyzed epimerization at C-5 of the 11b-substituted-indolizino[8,7-b]indole-5-carboxylic acid methyl esters was in line with the stereochemical relationship of the substituent on C-11b and the methoxycarbonyl group on C-5.
STRUCTURES OF SESTERTERPENOIDS FROM THE SCALE INSECT CEROPLASTES CERIFERUS. REVISION OF THE 14-MEMBERED CERIFERENE SKELETON FROM 2-t/6-c/10-t TO 2-c/6-t/10-t
Authors: Pawlak Jan K , Tempesta Michael S , Iwashita Takashi , Nakanishi Koji , Naya Yoko
Published: July 2006

The structures of two new macrocyclic sesterterpenoids ceriferol-l 1 and ceriferic acid-1 2 isolated from the secretion of the scale insect Ceroplastes ceriferus were determined. The results led to the revision of the arrangement of annular double bonds in the carbon skeleton (from la to l) of all compounds correlated in the previous reports.
A FACILE OXIDATIVE LACTONIZATION OF 1,ω-DIOLS WITH SODIUM BROMITE
Authors: Kageyama Toshifumi , Kawahara Shuji , Kitamura Kohji , Ueno Yoshio , Okawara Makoto
Published: July 2006

A practically useful method for the oxidation of 1,ω-diols to lactones is described. The scope and limitations are also presented.
BENZYLATION OF ALCOHOLS TO BENZYL ETHERS WITH ALKALI CATION EXCHANGED Y TYPE ZEOLITE
Authors: Onaka Makoto , Kawai Motomitsu , Izumi Yusuke
Published: July 2006

Benzylation of alcohols with benzyl chloride is found to proceed efficiently in the presence of alkali cation exchanged Y type zeolite in a non-polar solvent under neutral conditions. The effects of solvent and alkali cation of zeolite are studied.
A SIMPLE SYNTHETIC METHOD OF DEOXYRIBODINUCLEOTIDE BLOCKS
Authors: Takaku Hiroshi , Kamaike Kazuo , Suetake Masanori
Published: July 2006

Deoxyribodinucleotide blocks can be prepared rapidly by combining the phosphorylation and coupling reaction steps in one flask which also contents the synthesis of deoxyribodinucleotide blocks containing the guanosine unit.
ABSORPTION SPECTRA OF VINYL CATIONS
Authors: Kobayashi Shinjiro , Kitamura Tsugio , Taniguchi Hiroshi , Schnabel Wolfram
Published: July 2006

The absorption spectra of α-(p-methoxyphenyl)vinyl cations were measured by laser flash photolysis of the corresponding vinyl halides in acetonitrile and the nucleophilicity of several alcohols to the vinyl cations was evaluated by measuring the decay rates in the presence of the alcohols.
PREPARATION OF ENANTIOMERICALLY PURE 1-HYDROXY-NEOCEMBRENES TO DETERMINE THE UNSOLVED ABSOLUTE CONFIGURATION OF CEMBRENOIDS
Authors: Aoki Mario , Uyehara Tadao , Kato Tadahiro , Kabuto Kuninobu , Yamaguchi Shozo
Published: July 2006

Cis and trans 1-hydroxy-neocembrenes were prepared in an enantiomerically pure form by reduction of dl-ketone with respective (+)- and (−)-Darvon-LiAlH4 complex followed by purification with the aids of esterification with d- and l-menthoxyacetyl chlorides and (−)-camphanic acid chloride, respectively. Absolute configuration of naturally occurring (+)-mayol and (+)-cembrenene was determined by correlation with enantiomerically pure compounds.
THE REACTION OF TRIALKYLBORANES WITH LITHIUM ACETYLIDES PREPARED FROM TRIETHYL ORTHOPROPIOLATE AND PROPIOLALDEHYDE DIETHYL ACETAL
Authors: Hara Shoji , Dojo Hidetaka , Kato Tatuo , Suzuki Akira
Published: July 2006

Lithium acetylides with functional groups such as orthoester or acetal group in the molecule react with trialkylboranes with the migration of alkyl groups. The oxidation of the intermediates obtained from triethyl orthopropiolate gives a mixture of β-hydroxy-and α,β,-unsaturated esters, and the oxidation of those from propiolaldehyde diethyl acetal gives (E)-1-ethoxy-1-alken-3-ones respectively.
REDUCTION DE PHENYLSULFONYL-2 AZIRIDINES. SYNTHESE DE PHENYLTHIO-2 AZIRIDINES
Authors: Gaillot Jean-Marc , Gelas-Mialhe Yvonne , Vessiere Roger
Published: July 2006

Reductive cleavage of 2-phenylsulfonylaziridines with sodium amalgam provides an attractive synthetic route to 2-unsubstituted aziridines. LiAlH4 gives several compounds. DIBAH causes a sulfur-oxygen cleavage to form 2-phenylthioaziridines which are also prepared from 2-phenylsulfinylaziridines.
FLUORIDE ION CATALYSED MICHAEL REACTIONS
Authors: Clark James H , Cork David G , Robertson Malcolm S
Published: July 2006

A study of the relative efficiencies of different sources of F− in catalysing the Michael reaction of nitroethane to 3-buten-2-one reveals that KF or CsF supported on alumina are the best reagents.
EXPERIMENTAL APPROACH TO DISSIPATIVE PROCESS: TRAJECTORY TRACING IN COMPLICATED CHEMICAL REACTION SYSTEM
Authors: Matsuzaki Akiyoshi
Published: July 2006

The present study has introduced a new approach for the investigation of the complicated batch reaction system. This method is based on the spectrum theory and the stability theory. It was applied to the analysis of the typical temporal-evolution observed in the laser-induced aerosol formation from gaseous CS2molecules.
PREPARATION OF NEW Pt- AND Ni-CONTAINING CYCLIC ESTERS AND THEIR REACTIVITIES
Authors: Sano Kenji , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

New Pt- or Ni-containing cyclic esters (PCy3PtCOCH2CH2COO, (PCy3)2PtCOCH2CH2COO, dpe-PtCOCH2CH2COO, dpe-NiCH2CH2COO, and bpy-NiCH2CH2CH2COO; PCy3 = tricyclohexylphosphine, dpe = 1,2-bis(diphenylphosphino)ethane, bpy = 2,2′-bipyridine) are prepared by oxidative addition of the corresponding cyclic carboxylic anhydrides to Pt(0) or Ni(0) complexes.
ZEOLITE SUPPORTED Ru–Pt CATALYSTS FOR SELECTIVE FISCHER-TROPSCH SYNTHESIS
Authors: Okuda Osamu , Tatsumi Takashi , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

Ruthenium–platinum bimetallic catalysts, prepared by simultaneous ion-exchange on zeolite HY, selectively produced from synthesis gas branched-chain paraffins in the C4–C10 range, Exception to this was found for a catalyst with 4% Ru and 2% Pt by weight, which was highly active in exclusive formation of CH4.
ACTIVITY PATTERNS OF H3PMo12O40 AND ITS ALKALI SALTS FOR OXIDATION REACTIONS
Authors: Komaya Takashi , Misono Makoto
Published: July 2006

It has been demonstrated that oxidation reactions of organic compounds over H3PMo12O40 and its alkali salts are classified into two prototypes. In the first type reactions, the surface redox properties of catalysts are important, and in the second type the bulk properties. Oxygen-addition reactions like methacrolein to methacrylic acid are an example of the former, and oxidative dehydrogenation is the latter example.
HIGHLY EFFICIENT PHOTOREDUCTION OF METHYLVIOLOGEN BY TRIS(BIS-DIAZADIIMINE)RUTHENIUM(II) COMPLEXES
Authors: Kitamura Noboru , Kawanishi Yuji , Tazuke Shigeo
Published: July 2006

Photoreduction of methylviologen (MV2+) by several Ru(II)L3 (L:bisdiazadiimine) complex was studied in the presence of triethanolamine in aqueous solution. The quantum yield of MV+ formation (MV+) was as high as 0.98 or 0.85 in vacuo when L is 2,2′-bipyrazine or 2,2′-bipyrimidine, respectively. These results were interpreted as due to reductive quenchineg of Ru(II)L3* by triethanolamine.
CATALYTIC CARBONYLATION OF DIARYLIODONIUM SALTS PROMOTED BY PALLADIUM-ZINC SYSTEM. A NEW SYNTHESIS OF DIARYL KETONES AND DIARYL-α-DIKETONES
Authors: Uchiyama Masaharu , Suzuki Takehiko , Yamazaki Yasuo
Published: July 2006

Diaryliodonium salts react with carbon monoxide, in the presence of zinc and a catalytic amount of palladium acetate, to give a mixture of the corresponding diaryl ketones and diaryl-α-diketones under mild conditions.
A HIGHLY STEREOSELECTIVE SYNTHESIS OF ENOL-δ-LACTONES BY THE WITTIG REACTION OF GLUTARIC ANHYDRIDES WITH α-ALKOXYCARBONYLETHYLIDENETRIPHENYLPHOSPHORANE
Authors: Tsuboi Sadao , Fukumoto Hirohumi , Takeda Akira
Published: July 2006

Enol-δ-lactones were prepared stereoselectively by the title reaction.
SYNTHESIS OF TWO ISOMERIC TETRACYANOANTHRAQUINODIMETHANES
Authors: Yamaguchi Shunro , Tatemitsu Hitoshi , Sakata Yoshiteru , Misumi Soichi
Published: July 2006

Synthesis of two new acceptors, i.e., dibenzo- and naphtho-TCNQ, is described. Their redox potentials suggest that benzo and naphtho annelations to TCNQ lower the acceptor strength. Both compounds gave no CT complex with TTT, TTF, etc.
CHIRALITY TRANSFER DURING CYCLOBUTYL–CYCLOPROPYLMETHYL–HOMOALLYL CATION REARRANGEMENT AND SYNTHESIS OF (−)-ELDANOLIDE
Authors: Yokoyama Yasushi , Yunokihara Masatoshi
Published: July 2006

The (3R)-2,2-dimethyl-3-(2-methoxycarbonyl)ethylcyclobutyl cation rearranged to give (1S,2S)-1-(1-methoxy-1-methyl)ethyl-2-(2-methoxycarbonyl)ethylcyclopropane. The latter was transformed into (4R)-4-(3-methylbut-2-enyl)-4-butyrolactone with a high degree of chirality transfer. The γ-lactone was converted into (−)-eldanolide, an antipode of the wing gland pheromone of an African sugar-cane borer.
SYNTHESIS OF PROSTACYCLIN ANALOGUE (4-OXO-PGI2)
Authors: Ono Toshio , Sibasaka Isao , Nokami Junzo , Wakabayashi Shoji
Published: July 2006

A stable prostaglandin I2 (PGI2) analogue, 4-oxo-PGI2 was synthesized by employing Wittig-like olefin synthesis due to the reaction of a carbanion linked to an electron withdrowing group with a lactone carbonyl group.
TIME-RESOLVED AND LOW-TEMPERATURE ABSORPTION SPECTROSCOPIC STUDIES ON 10-SILAANTHRACEN-9(10H)-YLIDENE
Authors: Sugawara Tadashi , Iwamura Hiizu , Hayashi Hisaharu , Sekiguchi Akira , Ando Wataru , Liu Michael T H
Published: July 2006

Laser-photolysis studies have been carried out on a solution of 9-diazo-10,10-dimethyl-10-sila-9(10H)-anthracene in cyclohexane to obtain a series of UV absorptions due to transient species. The spectral assignment was corroborated by absorption spectra and ESR studies of the photolyses in an EPA matrix at 77 K.
STATE ANALYSIS OF STEEL SURFACES UTILIZING THE 9TH-ORDER FeKα1 LINE BY AN ELECTRON PROBE MICROANALYZER
Authors: Fujimori Haruo , Iba Hajime , Tsuchiya Hiroyuki
Published: July 2006

Chemical states of steel surfaces covered with iron oxides and fluorides were analyzed by a state analysis method utilizing the 9th-order FeKα1 line. The method was effective for the state analysis of iron compounds especially when the compounds were thicker than the detection depth of the FeKα1 line.
TRANSFORMATION OF β-ALKENYL-β-PROPIOLACTONES INTO CYCLOPROPYLACETIC ACIDS UTILIZING HYDROBORATION
Authors: Kawashima Masatoshi , Fujisawa Tamotsu
Published: July 2006

The reaction of β-alkenyl-β-propiolactones with 9-borabicyclo[3.3.1]nonane and subsequent treatment with sodium methoxide gave cyclopropylacetic acids in good yields.
THE SIX GEOMETRICAL ISOMERS OF BIS(4-AMINO-2-AZA-BUTANECARBOXYLATO)COBALT(III) ION, [Co(edma)2]+
Authors: Yasui Takaji , Kawaguchi Hiroshi , Ama Tomoharu
Published: July 2006

All of the six geometrical isomers possible in [Co(edma)2]+ complex ion (edma: 4-amino-2-aza-butanecarboxylato or ethylenediaminemonoacetato) were isolated in crystal and the five racemates were resolved into optically active isomers by a column chromatographic method. The visible absorption, 13C-NMR, and CD spectra were measured and the geometrical structures were assigned.
INTERMEDIATES IN AROMATIC NUCLEOPHILIC SUBSTITUTION OF 4-METHOXY- AND 4-CHLORO-3,5-DINITROBENZOIC ACIDS WITH HYDROXIDE ION IN AQUEOUS DIMETHYL SULFOXIDE
Authors: Hasegawa Yoshinori
Published: July 2006

The reactions of 4-methoxy- and 4-chloro-3,5-dinitrobenzoic acids with hydroxide ion in aqueous dimethyl sulfoxide were studied by visible absorption spectroscopy. The formation of anionic σ-complexes, followed by intermediate complexes was observed.
STUDIES OF 29Si SPIN-LATTICE RELAXATION TIMES AND PARAMAGNETIC IMPURITIES IN CLAY MINERALS BY MAGIC-ANGLE SPINNING 29Si-NMR AND EPR
Authors: Watanabe Tokuko , Shimizu Hiroshi , Masuda Akimasa , Saitô Hazime
Published: July 2006

High-resolution solid state 29Si-NMR spectra and EPR spectra have been examined on twelve natural philosilicates. It has been found that presence of paramagnetic impurities is markedly effective in shortening the 29Si spin-lattice relaxation times (10 to 1000 ms), and in broadening the linewidths and is favorable for the use of solid state high-resolution 29Si NMR as a tool for structural studies of inorganic materials.
PHOTO-DEHALOGANATION OF VICINAL DIHALIDE TO OLEFIN
Authors: Izawa Yasuji , Takeuchi Masaki , Tomioka Hideo
Published: July 2006

Irradiation of vicinal dihalides in the presence of methanol or triethylamine resulted in an efficient dehalogenation to regenerate olefins.
REACTIONS OF ORGANOLANTHANOID σ COMPLEXES WITH α,β-UNSATURATED CARBONYL COMPOUNDS. SELECTIVE 1,2-ADDITION
Authors: Yokoo Kazuhiro , Yamanaka Yasuhiro , Fukagawa Toshihiro , Taniguchi Hiroshi , Fujiwara Yuzo
Published: July 2006

Organoytterbium iodide σ complexes (RYbl) react with α,β-unsaturated carbonyl compounds such as acrolein, methyl vinyl ketone, benzalacetone, chalcone, and 2-cyclohexen-1-one to give 1,2-addition products selectively. This high selectivity is explained in terms of the HSAB theory.
A NEW ELECTROGENERATED BASE. CONDENSATION OF CHLOROFORM WITH ALIPHATIC ALDEHYDES
Authors: Shono Tatsuya , Kashimura Shigenori , Ishizaki Kunihiko , Ishige Osamu
Published: July 2006

A novel base was generated by electrochemical reduction of 2-pyrrolidone in DMF, and this electrogenerated base (EGB) was effective to promote the condensation of chloroform with aliphatic aldehydes in good yields.
ABSORPTION SPECTRUM OF THE 2,3-DIHYDROXY-2-PROPENAL (TRIOSE REDUCTONE) RADICAL
Authors: Horii Hideo , Abe Yasuo , Taniguchi Setsuo , Maeda Shigeichi , Watanabe Takehiko
Published: July 2006

Absorption spectrum of 2,3-dihydroxy-2-propenal (triose reductone) radical was observed upon the oxidation by anion radicals (SCN)2−· and Br2−· in pulse-irradiated solutions. The triose reductone radical was found to decay by a bimolecular reaction.
STEREOSELECTIVITY IN THE PHOTOCYCLODIMERIZATION OF PHENYL VINYL ETHER VIA ELECTRON-TRANSFER
Authors: Mizuno Kazuhiko , Kagano Hirokazu , Kasuga Toshio , Otsuji Yoshio
Published: July 2006

The stereoselectivity in the photocyclodimerization of phenyl vinyl ether (D) via electron-transfer depends strongly upon the concentration of D and the reaction temperature.
STEREOCHEMISTRY OF REACTION OF (E)- AND (Z)-β-TRIMETHYLSILYLSTYRENE WITH ARYLPALLADIUM TETRAFLUOROBORATES GENERATED FROM ARENEDIAZONIUM TETRAFLUOROBORATES AND PALLADIUM(0)
Authors: Kikukawa Kiyoshi , Ikenaga Kazutoshi , Wada Fumio , Matsuda Tsutomu
Published: July 2006

(E)- and (Z)-PhCH=CHSiMe3 react easily with [ArPd]+BF4− to give (E)-PhCH=CHAr and Ph(Ar)C=CH2 at 25 °C. Stereochemistry of the desilylation is disclosed by using (E)- and (Z)-PhCH=CDSiMe3, that is, syn-addition of Ar-Pd species followed by anti-elimination of Pd and Me3Si moiety for (E)-isomer and syn-elimination for (Z)-isomer are proposed.
DETERMINATION OF PLATINUM BINDING BASES BY ENZYMATIC DIGESTION
Authors: Inagaki Kenji , Kasuya Kyoko , Kidani Yoshinori
Published: July 2006

The reaction mixtures of dinucleotides (G3′p5′G and G3′p5′U) with platinum complexes ([Pt(NH3)3Cl]Cl and cis-Pt(NH3)2Cl2) have been treated with exonuclease (snake venom phosphodiesterase and calf spleen phosphodiesterase), and the platinum binding base in dinucleotides has been determined on the basis of HPLC analysis of the enzymatic digestion products.
ONE-STEP SYNTHESIS OF OXAZOLES FROM KETONES AND NITRILES USING COPPER(II) TRIFLUOROMETHANESULFONATE AS A KEY REAGENT
Authors: Nagayoshi Kazuo , Sato Tadashi
Published: July 2006

Oxazoles were prepared in one step from ketones and nitriles using copper(II) trifluoromethanesulfonate under acid catalysis.
PHOTOCYCLOADDITION OF 3-ARYL-2-ISOXAZOLINES WITH FIVE-MEMBERED HETEROCYCLES
Authors: Kumagai Tsutomu , Kawamura Yasuhiko , Mukai Toshio
Published: July 2006

The irradiation of 3-aryl-2-isoxazolines gives novel [2+2] adducts with furan (or thiophene) by addition across the carbon–nitrogen double bond.
THERMAL REACTION OF 2,3-DIAZATETRACYCLO[5.3.1.04,11.06,8]UNDECA-2,9-DIENES: THE NITROGEN EXTRUSION AND THE MASKED HOMODIENYL-1,5-HYDROGEN SHIFT
Authors: Ohba Yoshihiro , Kumagai Tsutomu , Mukai Toshio
Published: July 2006

Thermolyses of the title compounds produce three kinds of products which are derived from nitrogen extrusion and 1,5-hydrogen shifts. The reaction mechanism is discussed in connection with the thermal behavior of bicyclo[4.2.1]nonatriene.
SYNTHESES AND SPECTRAL CHANGES OF β-IONONE DERIVATIVES BEARING A CARBOXYL GROUP ISOLATED FROM π-CONJUGATED SYSTEM
Authors: Nanasawa Masato , Kamogawa Hiroyoshi
Published: July 2006

β-Ionone derivatives bearing an o- or p-carboxyphenoxy substituent at the 3-position were synthesized. The iminium salt having an o-carboxyl group absorbs at a shorter wavelength, while under alkaline conditions λmax shifts to a longer wavelength presumably on account of the electrostatic attraction between the carboxylate anion and the positive charge.
A NEW FERULOYLATED TRISACCHARIDE FROM BAGASSE
Authors: Kato Atsushi , Azuma Jun-ichi , Koshijima Tetsuo
Published: July 2006

O-(5-O-Feruloyl-α-l-arabinofuranosyl)-(1→3)-O-β-d-xylopyranosyl-(1→4)-d-xylopyranose (I) was isolated from the enzymatic hydrolysate of bagasse lignin–carbohydrate complex containing ferulic acid (LCC-F) and identified from I.R., U.V., G.L.C.-M.S., and N.M.R. spectra.
ENHANCEMENT OF ERYTHRO-SELECTIVITY IN THE [2,3]-WITTIG REARRANGEMENT OF CROTYL PROPARGYL ETHER SYSTEM AND ITS USE IN THE STEREOCONTROLLED FORMAL SYNTHESIS OF (±)-OUDEMANSIN
Authors: Mikami Koichi , Azuma Ken-ichi , Nakai Takeshi
Published: July 2006

The [2,3]-Wittig variant of (Z)-crotyl ether involving trimethylsilylethynyl (or 1-propynyl) group as the key substituent on the carbanion terminus exhibits an exceptionally high level of erythro-selection, and its synthetic potential is illustrated in the formal synthesis of antibiotic (±)-oudemansin.
STRUCTURE AND CONFORMATION OF FURANOCYCLONONENE DITERPENOIDS FROM THE SEAWEED DICTYOTA DICHOTOMA
Authors: Enoki Nobuyasu , Shirahama Haruhisa , Osawa Eiji , Urano Shiro , Ishida Ryoichi , Matsumoto Takeshi
Published: July 2006

The structure of new diterpenoids dictyofuran T and dictyofuran C, isolated from the brown seaweed Dictyota dichotoma, has been determined on the basis of spectral and chemical means.
MEASUREMENT OF ENZYMATIC ACTIVITY OF INORGANIC PYROPHOSPHATASE FOR PYROPHOSPHATE BY FLOW INJECTION ANALYSIS
Authors: Yoza Norimasa , Hirano Hisanobu , Okamura Mayumi , Ohashi Shigeru , Hirai Yukio , Tomokuni Katsumaro
Published: July 2006

A flow injection system was designed for the spectrophotometric measurement of enzymatic hydrolysis of pyrophosphate by inorganic pyrophosphatase (EC 3.6.1.1). Rapid hydrolysis with a very short half-life (2 min) could be easily monitored by the selective detection of orthophosphate using a Mo(VI) reagent.
STEREOCHEMISTRY OF THE C-4 PROCHIRAL HYDROGEN ATOM ELIMINATION OF MEVALONATE IN THE BIOSYNTHESIS OF POLYPRENOLS IN HIGHER PLANTS
Authors: Suga Takayuki , Aoki Tadeshi , Hirata Toshifumi , Saragai Yoshio
Published: July 2006

In the biosynthesis of the polyprenols in the five higher plants examined hitherto, it was found that stereochemistry of the C-4 prochiral hydrogen atom elimination of mevalonate in the formation of their E-isoprene chain follows Cornforth’s basic priciple for mevalonoid biosynthesis, but the formation of their Z-isoprene chain involves, contrary to this principle, the elimination of the pro-4s hydrogen atom of mevalonate
CATALYSIS OF HFe3(CO)11− GRAFTED IN A HYDRATED NaY ZEOLITE IN THE WATER GAS SHIFT REACTION
Authors: Iwamoto Masakazu , Kusano Hideto , Kagawa Shuichi
Published: July 2006

The anionic hydride HFe3(CO)11− species grafted in the zeolite by ionic interaction with an Al3+ ion showed high catalytic activity for the water gas shift reaction, which was comparable to that of iron carbonyl in homogeneous phase. Kinetic and spectroscopic measurements indicated a reaction of HFe3(CO)11− with H2O as a rate determining step.
THE PHOTOREACTION OF AMINES OR ENAMINES WITH METAL COMPLEXES OF β-DIKETONES
Authors: Sato Tadashi , Watanabe Kazuhiro
Published: July 2006

The irradiation of amines or enamines with metal complexes of β-diketones in acetonitrile induced a coupling reaction to produce dihydrofuran derivatives.
2- (PHENYLTHIO)-2-PENTEN-5-OLIDE, A NEW BUILDING BLOCK FOR THE SYNTHESIS OF 3-SUBSTITUTED δ-LACTONES
Authors: Kato Michiharu , Ouchi Akihiko , Yoshikoshi Akira
Published: July 2006

2- (Phenylthio)-2-penten-5-olide, readily accessible from δ-valelolactone, showed high electrophilic reactivities toward some typical carbon nucleophiles to give 3-substituted 2-(phenylthio)pentanolides, which were convertible to a variety of 3-substituted pentan-5-olides and 2-penten-5-olides.
OPTICALLY ACTIVE DIALLYLBIS(2-PHENYLBUTYL)TIN. SYNTHESIS AND APPLICATION TO ASYMMETRIC SYNTHESIS OF HOMOALLYL ALCOHOLS
Authors: Otera Junzo , Kawasaki Yuzuru , Mizuno Hirofumi , Shimizu Yasumi
Published: July 2006

Optically active diallylbis(2-phenylbutyl)tin (1) was successfully obtained by the Grignard method. Enantioselective reaction of 1 with various aldehydes afforded homoallyl alcohols in 20–80% optical yields, which are not affected by solvent effect, but are highly dependent on aldehydes.
STEREOSELECTIVE TOTAL SYNTHESIS OF (4S)-trans-β-ELEMENONE FROM (S)-2-CYCLOHEXEN-1-OL
Authors: Sato Toshio , Gotoh Yoshihiko , Watanabe Makoto , Fujisawa Tamotsu
Published: July 2006

Stereoselective first total synthesis of (4S)-trans-β-elemenone was achieved from (S)-2-cyclohexen-1-ol, prepared easily by the asymmetric reduction of 2-cyclohexen-1-one with chiral hydride reagent.
DURABLE CHIRAL GRAPHITE ELECTRODES MODIFIED CHEMICALLY WITH POLY(l-VALINE) AND POLY(N-ACRYLOYL-l-VALINE METHYL ESTER)
Authors: Abe Shigemitsu , Nonaka Tsutomu
Published: July 2006

Graphite electrodes modified chemically with poly(l-valine) and poly(N-acryloyl-l-valine methyl ester) were prepared. They were remarkably more durable than the corresponding dip-coated electrodes when used repeatedly in the electrochemical asymmetric reduction of citraconic acid.
SYNTHESE TOTALE DE LA (d,l) α-CONIDENDRINE
Authors: Nabi Yahia , Dhal Robert , Brown Eric
Published: July 2006

Michael addition of the carbanion of the dithian 7 (derived from O-benzyl vanillin) on butenolide, afforded the saturated lactone 8. Alkylation of the latter with the benzylic bromide 6, followed by regeneration of the carbonyl group gave the α,β-disubstituted lactone 10. Reduction of the ketonic carbonyl group of compound 10 using NaBH4, followed by treatment with CF3CO2H and catalytic hydrogenolysis afforded (d,l)α-conidendrin 1.
INVESTIGATION OF THE DEALUMINATION OF ZEOLITE ZSM-5 BY SOLID-STATE MAGIC-ANGLE SPINNING NMR
Authors: Fyfe C A , Gobbi G C , Kennedy G J
Published: July 2006

The dealumination of ZSM-5 by various procedures has been monitored by 29Si and 27Al MAS NMR. The results suggest that ZSM-5 and ‘Silicalite’ are isostructural: Resolved signals from up to 15 crystallographically inequivalent Si tetrahedra are observed in the 29Si spectra of highly dealuminated ZSM-5 materials identical with those observed in the spectra of very highly siliceous ‘Silicalite’ prepared by direct synthesis.
PROTON CONDUCTION IN ANTIMONIC ACID AT MEDIUM TEMPERATURES IN THE PRESENCE OF WATER VAPOR
Authors: Ozawa Yoshihiro , Miura Norio , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

Antimonic acid was found to exhibit a relatively high proton conductivity at medium temperatures of 100–300 °C in the presence of water vapor. For example, the conductivity as high as 1×10−4 S·cm−1 could be maintained for 8 h at 200 °C under the water vapor pressure of 13 kPa. This stable conductivity at medium temperature was found to be attributable to the thermal stability of the water of constitution of Sb2O5·2H2O.
AN IMPROVED TYPE OF PROTON CONDUCTOR SENSOR SENSITIVE TO H2 AND CO AT ROOM TEMPERATURE
Authors: Miura Norio , Kato Hiroshi , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

The use of an Ag reference electrode inert to H2 in air made it possible to fabricate a miniaturized proton conductor sensor element which did not necessitate separation of the sample gas from the reference gas (air). The sensor element was as small as 4 mm (diameter) × 8 mm (length) and showed both high sensitivity and fast response to small amounts of H2 or CO in air, with satisfactory stability for a period of about one month.
TWO NOVEL HUMULENOIDS FROM TORILIS SCABRA D.C.
Authors: Itokawa Hideji , Matsumoto Hajime , Mihashi Susumu , Iitaka Yoichi
Published: July 2006

Two humulene type sesquiterpnoids were isolated from Torilis scabra D.C. and their structures were determined by X-ray analysis.
HYDROXY IRON(III) SPECIES STABILIZED WITH BULKY PORPHYRINS
Authors: Miyamoto T Ken , Tsuzuki Seizi , Hasegawa Tai , Sasaki Yukiyoshi
Published: July 2006

Stable hydroxy iron (III) complexes have been prepared in the use of bulky porphyrins, e.g., meso-tetrakis(3,5-di-t-butylphenyl)porphyrin(Abbr. TBPP-H2) and meso-tetrakis(3,5-di-t-butyl-2-nitrophenyl)porphyrin(TBNPP-H2, 4 isomers). The stability of these complexes is rationalized as steric effect due to the t-butyl and/ or nitro groups.