bluuebunny/crossref_metadata_2025 huggingface dataset:
CATALYTIC ASYMMETRIC HYDROGENATIONS WITH POLYMER SUPPORTED CHIRAL PYRROLIDINEPHOSPHINE–RHODIUM COMPLEXES
Authors: Achiwa Kazuo
Published: July 2006

The syntheses of new polymer supported chiral pyrrolidinephosphine–rhodium catalysts; 4VB-PPM-HEMA-Rh+ (6a) and 4VB-PPM-HEMA-Rh (6b) and their application to the asymmetric hydrogenation of some olefins were described. Thus, 4VB-PPM-HEMA-Rh+ in the presence of triethylamine gave (S)-α-methylsuccinic acid and (R)-N-acetylphenylalanine in 82.3 and 70.0% optical yields respectively.
CYCLIC SULFATE FORMATION FROM EPOXIDES
Authors: Nishinaga Akira , Wakabayashi Shigenori
Published: July 2006

The reactions of 2,4,6-tri-tert-buty1-4,5-epoxy-6-hydroxy-2-cyclohexenone and 2,4,6-tri-tert-butyl-2,3,4,5-diepoxy-6-hydroxycyclohexanone with sulfuric acid in acetic anhydride led to opening of the epoxy ring at 4-position to give the corresponding 4,5-sulfonyldioxy derivatives (cyclic sulfates).
REACTION PRODUCTS OF FUNCTIONALLY SUBSTITUTED 2-CHLOROPROPANES WITH BENZENE CATALYZED BY ALUMINUM CHLORIDE
Authors: Matsuda Haruo , Shinohara Hideo
Published: July 2006

Reactions of 1-X-2-chloropropanes (X=CH3O–, HO– and CH3OCO–) with benzene catalyzed by AlCl3 have been studied. The former two secondary chlorides gave unusual products, n-propylbenzene and 1,1-diphenyl-1-propene, in addition to 1-X-2-phenylpropane, 1,1- and 1,2-diphenylpropanes, respectively, whereas the other one afforded only methyl 3-phenylbutanoate.
A STABLE PYRIDINESULFENYL HALIDE
Authors: Matsueda Rei , Aiba Kimie
Published: July 2006

Synthesis of 3-nitro-2-pyridinesulfenyl halide (NPySX) is reported. NPySX was found to be extraordinarily stable as compared with known pyridinesulfenyl halides and contribution of the nitro group to its stabilization was indicated by X-ray diffraction investigation of one of its derivatives.
PHOTOREACTION OF 1,5-DIMETHYL-6-OXACYCLOPROPYLIDENETRICYCLO[3.2.1.02,7]OCT-3-EN-8-ONE: A NOVEL TYPE OF ADDITION OF KETENE WITH THE MOIETY CONTAINING AN EPOXIDE RING
Authors: Nitta Makoto , Nakatani Hazime
Published: July 2006

1,5-Dimethyl-6-oxacyclopropylidenetricyclo[3.2.1.02,7] oct-3-en-8-one (II), upon irradiation, afforded 4,8-dimethyl-1,4-dihydrobenzopyran-3-one (III). This rearrangement was considered to be a novel ene-type reaction of photochemically generated ketene with the moiety involving an epoxide ring. The ketene intermediate was detected by low temperature ir spectrum as well.
STEREOCHEMISTRY OF PHOTOCYCLOADDITION PRODUCTS OF ACENAPHTHYLENE WITH ACRYLONITRILE AND METHYL ACRYLATE
Authors: Nakamura Yushin , Imakura Yasuhiro , Morita Yutaka
Published: July 2006

Stereochemistry of photocycloaddition products of acenaphthylene with acrylonitrile and methyl acrylate were decided by the chemical transformations and the NMR spectral correlation with those of their derivatives, viz., equilibriation of the deuterated isomers of acrylonitrile-adduct with t-BuOK/BuOD, reduction to amine with LiAlH4, acetylation of amine, and hydrolysis followed by methylation of acrylonitrile-adduct to methyl acrylate adduct.
LIMONOIDS FROM MELIA AZEDARACH LINN. VAR. JAPONICA MAKINO. II. THE NATURAL HYDROXYL PRECURSOR OF SENDANIN
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Ishida Hiroaki , Tokoroyama Takashi
Published: July 2006

Because sendanin is an artifact which has been isolated from M. azedarach Linn. var. japonica Makino only after the acetylation of crude limonoid fraction, the structure of the natural hydroxyl precursor was studied. The chemical and spectroscopic evidence revealed that it was an epimeric mixture of the hemiacetal 5.
CONFORMATIONAL CHANGE OF PHOTORESPONSIVE CAPPED CYCLODEXTRIN DETECTED BY CIRCULAR DICHROISM
Authors: Ueno Akihiko , Saka Rumiko , Osa Tetsuo
Published: July 2006

The circular dichroism spectrum of azobenzene-capped β-cyclodextrin (I) was found, in some cases, to show an abrupt change on addition of guest molecules with ionic nature. This nonstoichiometric behavior was regarded as evidence for a conformational transition of the cyclodextrin moiety caused by outside binding of the guest molecules.
A SIMPLE SYNTHESIS OF (+)-11-DEOXY-11α-HYDROXYMETHYL PGF1α AND ITS 12-ISOMER FROM AUCUBIN
Authors: Ohno Kiyotaka , Naruto Masanobu
Published: July 2006

A simple synthesis of the titled prostanoids, (+)-11-deoxy-11α-hydroxymethyl PGF1α  9 and its 12-isomer 6, from aucubin 1 is described. The latter prostanoid 6 is characterized by its all-cis configuration on the cyclopentanering.
ASYMMETRIC SYNTHESIS OF TWO ENANTIOMERS OF FRONTALIN
Authors: Sakito Yoji , Mukaiyama Teruaki
Published: July 2006

(S)-Frontalin and its antipode were separately synthesized in good yields from (S)- and (R)-2-hydroxy-2,6-dimethyl-6-heptenal, which were prepared in high optical yields by an asymmetric synthesis using (S)- 2-(anilinomethyl)pyrrolidine as a chiral auxiliary.
SYNTHESES AND PROPERTIES OF TRIMETHYLBISDEHYDRO[15]ANNULENONE AND ITS BENZANNELATED DERIVATIVES
Authors: Ojima Juro , Wada Kazuyo , Kanazawa Keiko
Published: July 2006

Syntheses of 5,10,15-trimethyl- 6,10,15-dimethylbenzo[d]-6,8-bisdehydro[15]annulenone 7,2,12-dimethylbenzo[f]-8,10-bisdehydro[15]annulenone 8, and 15-methyldibenzo[d,j]-6,8-bisdehydro[15]annulenone 9 are described. As observed for the corresponding[17]annulenone, the 1H-NMR spectra of these annulenones suggest that the skeleton of the bisdehydro[15]annulenone of this type is more planar and less strained than that of [13]annulenone.
A NEW AND CONVENIENT SYNTHESIS OF TRISUBSTITUTED α,β-UNSATURATED CARBOXYLIC ESTERS
Authors: Tanaka Kazuhiko , Uneme Hideki , Ono Noboru , Kaji Aritsune
Published: July 2006

A new and single-step method for the synthesis of trisubstituted α,β-unsaturated esters using the lithium enolates of S-1-ethoxycarbonylethyl diethyl phosphorothioate (Ib) and S-1-ethoxycarbonylbutyl diethyl phosphorothioate (Ic) has been developed.
A FACILE METHOD FOR THE PREPARATION OF OPTICALLY PURE 2,4-PENTANEDIOL; AN APPLICATION OF ASYMMETRICALLY MODIFIED NICKEL CATALYST FOR THE PREPARATION OF OPTICALLY ACTIVE COMPOUNDS
Authors: Ito Kazuhisa , Harada Tadao , Tai Akira , Izumi Yoshiharu
Published: July 2006

The hydrogenation of acetylacetone over asymmetrically modified Raney nickel catalyst gave the chiral diastereomer of 2,4-pentanediol selectively with high optical purity. The recrystallization of the hydrogenation product from the ethereal solution gave optically pure (2R*,4R*)-2,4-pentanediol. Thus, (−)-(2R,4R)- and (+)-(2S,4S)-2,4-pentanediol were obtained from the hydrogenation products on using (R,R)- and (S,S)-tartaric acid-NaBr-modified Raney nickel, respectively.
PREPARATION OF S,S-DIALKYL(DIARYL) PHOSPHORODITHIOATES BY MEANS OF TRIMETHYLSILYL PHOSPHORODICHLORIDATE
Authors: Yamaguchi Kazuo , Honda Shinkichi , Hata Tsujiaki
Published: July 2006

Trimethylsilyl phosphorodichloridate prepared by the reaction of methyl phosphorodichloridate with trimethylsilyl bromide was found to be a useful phosphorylating agent for the synthesis of S,S-dialkyl phosphorodithioates.
A CONVENIENT METHOD OF THE SYNTHESIS OF PHOSPHOPEPTIDE VIA AZIRIDINE RING OPENING REACTION
Authors: Okawa Kenji , Yuki Masanori , Tanaka Takumi
Published: July 2006

The reaction of aziridine peptides with dibenzylphosphoric acid and 85% phosphoric acid afforded O-phosphoserine and O-phosphothreonine peptides passing through the ring opening of aziridine in good yields.
KINETIC STUDY ON DENATURATION OF TOBACCO MOSAIC VIRUS COAT PROTEIN BY THE RAPID CIRCULAR DICHROIC SPECTRA MEASUREMENT
Authors: Sano Yoh , Inoue Hideo
Published: July 2006

The kinetics of denaturation of tobacco mosaic virus coat protein has been studied by a stopped-flow spectropolarimeter. The time courses of ellipticity change at 222 nm suggest the denaturation of TMV protein by guanidinium chloride or urea to be a pseudo-first order reaction.
GENERAL BASE-CATALYZED HYDROLYSIS OF 2,2,2-TRIFLUOROETHYL 4-NITROBENZOATE BY α-CYCLODEXTRIN
Authors: Komiyama Makoto , Inoue Shohei
Published: July 2006

α-Cyclodextrin accelerated the hydrolysis of 2,2,2-trifluoroethyl 4-nitrobenzoate at pH 9.6, 20°C. Kinetic analyses and considerable D2O solvent isotope effect (1.7 fold) showed that the reaction proceeds mostly through general base catalysis by α-cyclodextrin with minor contribution of nucleophilic catalysis. This is the first finding of general base catalysis of ester hydrolysis by cyclodextrin.
THE COBALT(III) COMPLEXES CONTAINING GLYCYLGLYCINATE AND IMINODIACETATE, N-METHYLIMINODIACETATE, OR ETHYLENEDIAMINEMONOACETATE AS THE MIXED LIGANDS
Authors: Kawaguchi Hiroshi , Maeda Kiyoko , Ama Tomoharu , Yasui Takaji
Published: July 2006

The mixed ligand complexes, [Co(glygly)(L)] (L: ida, mida, and enma), have been prepared and their structures were discussed on the basis of the 1H- and 13C-NMR data. It has been shown that each terdentate ligand L in these complexes coordinates selectively to cobalt(III) in meridional form. Absorption spectra of these complexes are also reported.
CHEMICAL INTERCONVERSION OF TRYPTOPHAN AND N′-FORMYLKYNURENINE
Authors: Sakiyama Fumio , Nakazawa Takashi
Published: July 2006

A novel reaction to convert 3-alkyl-2-amino-3H-indol-3-ol to 3-alkylindole is described. The yield was 60–80% for four 2-amino-3H-indol-3-ols examined. With aqueous sodium borohydride, 3-alkyl-2-amino-3H-indol-3-ol was reduced and deaminated predominantly to the corresponding indolin-3-ol, which was then dehydrated to 3-alkylindole in acidic media. Eventually a reaction cycle to interconvert tryptophan and N′-formylkynurenine was established.
REGIOSELECTIVE C–C BOND FORMATION OF O-LINALYL-N,N-DIMETHYLHYDROXYLAMINE VIA CARBOPALLADATION
Authors: Hirai Kenji , Ishii Norio , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Stable carbopalladation complexes were prepared by regioselective addition of active methylene compounds to O-linalyl-N,N-dimethylhydroxylamine (1) in the presence of Pd(II) complexes, and degradated selectively to the corresponding alkene derivatives by treatment with trimethylsilyl chloride.
RADIATION-INDUCED CYCLOREVERSION OF INDENE CYCLOBUTANE DIMERS IN n-BUTYL CHLORIDE BY A CHAIN REACTION MECHANISM
Authors: Majima Tetsuro , Pac Chyongjin , Takamuku Setsuo , Sakurai Hiroshi
Published: July 2006

The cycloreversion of trans,syn- and cis,syn-indene dimers (I and II) occurred upon γ-radiation of n-butyl chloride solutions. The effects of additives and high G values for formation of indene demonstrated that the cycloreversion proceeds by means of a chain reaction mechanism involving cation radicals as chain carriers.
SELF-ASSOCIATION OF PURINE BASES IN WATER-ORGANIC COMPONENT MIXTURES: 6-METHYLPURINE IN WATER-DIMETHYLSULFOXIDE SYSTEM
Authors: Morimoto Satoshi , Kinouchi Makoto
Published: July 2006

Thermodynamic quantities of the self-association of 6-methylpurine in water(1)-dimethylsulfoxide(DMSO)(2)(x2<0.1) mixed solvent have been obtained at 25°C. They decreased remarkably with the mole fraction of DMSO up to about x2=0.012 and then increased steeply. This behavior indicates that DMSO tends to stabilize the solvent structure at its very low content.
[3,3]-SIGMATROPIC REARRANGEMENT OF 2-AZA-4-OXY-1,5-HEXADIENE SYSTEM A NOVEL PYRROLIDINE SYNTHESIS
Authors: Kakimoto Masa-aki , Okawara Makoto
Published: July 2006

3-Acetylpyrrolidines were prepared in high yield when 5-vinyloxazolidines were treated with potassium hydride and 18-Crown-6. The base catalyzed oxy-2-aza-Cope rearrangement features this reaction.
NUCLEOPHILIC ATTACK OF THE ACETYLACETONATE CARBANION ON THE NITRILE CARBON IN trans-[PtCl2(C6H5CN)2]: X-RAY STRUCTURE OF THE PRODUCT N-ACETYL-β-KETOAMINE CHELATE
Authors: Uchiyama Toshihiko , Takagi Kazuhiko , Matsumoto Keiji , Ooi Shun’ichiro , Nakamura Yukio , Kawaguchi Shinichi
Published: July 2006

trans-Dichlorobis(benzonitrile)platinum(II) reacted with thallium(I) acetylacetonate in dichloromethane at room temperature to give three kinds of yellow products. One of them was obtained as fine crystals and revealed by an X-ray analysis to be N-acetyl-β-ketoamine chelate, trans-[Pt(N(COCH3)=C(C6H5)CH=COCH3)2].
PREFERENTIAL CONFORMATION FOR INTRAMOLECULAR EXCIPLEX FORMATION IN CHEMILUMINESCENCE OF THE DIOXETANES, 1-(1-SUBSTITUTED-3-INDOLYL)-6-ARYL-2,5,7,8-TETRAOXABICYCLO[4.2.0]OCTANES
Authors: Nakamura Hideshi , Goto Toshio
Published: July 2006

The title dioxetanes give in polar solvents visible chemiluminescence which is proven to be produced from the intramolecular exciplex between two aromatic substituents on the product diesters by comparison of chemiluminescence of the dioxetanes (2a–2d) and fluorescence of the corresponding diesters (3a–3d). That decomposition of the dioxetanes gives the corresponding diesters (in a singlet excited state) in a preferential conformation for the formation of intramolecular exciplex is also concluded from the above analysis as well as the examination of conformational effects on the exciplex fluorescence of the diesters, 4 and 5.
REACTION OF FURYLLITHIUM WITH ACYLTRIMETHYLSILANES. SPECIFIC GENERATION OF 5-TRIMETHYLSILOXY-3,4-PENTADIENONE ENOLATES
Authors: Kuwajima Isao , Atsumi Kunio , Tanaka Toshihiko , Inoue Tan
Published: July 2006

5-Trimethylsiloxy-3,4-pentadienone enolates can be generated efficiently by treating furyllithium with acyltrimethylsilanes and can be isolated in good yield as their silyl enol ethers.
TWO CONSECUTIVE GEAR MOTIONS IN CONFORMATIONAL INTERCONVERSION IN 9-(2-METHYLBENZYL)TRIPTYCENE DERIVATIVES
Authors: Yamamoto Gaku , Oki Michinori
Published: July 2006

The conformational interconversion among ±sc and ap forms of 9-(2-methylbenzyl)triptycenes is found to occur by two consecutive gear motions: methyl-inside conformers formed by the synchronous rotation about the CH2–Ar and CH2–C9 bonds of the methyl-outside conformers are so unstable that another synchronous rotation takes place in succession to afford methyl-outside conformers. The change in 1H-nmr line shapes and the barriers to rotation are discussed.
A STEREO AND REGIOSPECIFIC ROUTE TO THE SYNTHETIC INTERMEDIATE FOR THE SYNTHESIS OF 9(0)-METHANOPROSTACYCLIN
Authors: Shibasaki Masakatsu , Iseki Katsuhiko , Ikegami Shiro
Published: July 2006

A stereo and regiospecific route to the synthetic intermediate, bicyclo[3.3.0]octan-2-one derivative, for the total synthesis of 9(0)-methanoprostacyclin is described starting from 1,3-cyclooctadiene, in which as a key reaction, the conjugate addition of the Gilman reagent to the bicyclo[3.3.0]oct-8-en-2-one skeleton is involved.
THE SYNTHESIS OF γ-l-GLUTAMYL-l-CYSTEINE USING AN IMMOBILIZED DERIVATIVE OF γ-GLUTAMYLCYSTEINE SYNTHETASE
Authors: Ito Hisashi , Nagatani Yasunori , Ichikizaki Iwao , Yamasaki Makoto
Published: July 2006

An immobilized derivative of γ-gluamylcysteine synthetase was prepared by chemically combining γ-glutamylcysteine synthetase with Sepharose 4B. The immobilized enzyme had a similar pH-activity profile to that of the native one and was much more stable to heat than the native enzyme. The immobilized enzyme retained its full activity after storage at least for 5 months at 4°C, while the native enzyme lost its activity within 2 weeks under the same conditions.
DOUBLE MINIMUM SPLITTING IN gauche 1-PROPANETHIOL BY MICROWAVE SPECTRUM
Authors: Nakagawa Jun , Hayashi Michiro
Published: July 2006

Torsional splitting of the thiol group in gauche 1-propanethiol was directly observed by microwave spectroscopy. From the splitting, the Fourier component of the internal rotation potential function was determined to be V3=1302 cal/mol on the assumption that V1 and V2 were equal to those of ethanethiol. The dipole moments were also determined.
FACILE OXIDATION OF HEMITHIOL ACETALS BY FLAVIN: EVIDENCE FOR THE ENEDIOL MECHANISM OF GLYOXALASE I
Authors: Shinkai Seiji , Yamashita Takaharu , Kusano Yumiko , Manabe Osamu
Published: July 2006

The rearrangement of the hemithiol acetal to the α-hydroxythiol ester is almost completely inhibited on the addition of flavin due to the occurrence of the flavin-trapping of the enediol intermediate. This result suggests that the enzymic catalysis by glyoxalase I occurs via the enediol intermediate.
REACTIONS OF ETHYLENE AND BENZENES CATALYZED BY RHODIUM CARBONYLS UNDER CARBON MONOXIDE. THE FORMATION OF STYRENES AND 3-PENTANONE
Authors: Hong Pangbu , Yamazaki Hiroshi
Published: July 2006

The reaction of ethylene with benzene catalyzed by rhodium carbonyls under carbon monoxide gives styrene and 3-pentanone in good yields, together with small amounts of propiophenone, 1-phenyl-1-penten-3-one, and 1-phenyl-3-pentanone.
KINETICS OF FLUORESCENCE QUENCHING OF 9-AMINOACRIDINE AND 9-AMINO-10-METHYLACRIDINIUM BY PURINE MONONUCLEOTIDES
Authors: Kubota Yukio , Motoda Yuko
Published: July 2006

A study on the kinetics of fluorescence quenching of 9-aminoacridine and 9-amino-10-methylacridinium by purine mononucleotides (adenosine-5′-monophosphate and guanosine-5′-monophosphate) is reported. A set of quenching parameters have been obtained on the basis of the kinetic scheme involving both dynamic and static quenching processes.
(−)-ISOBICYCLOGERMACRENAL, A NOVEL SESQUITERPENOID OF ENT-ISOBICYCLOGERMACRENE GROUP FROM THE LIVERWORT LEPIDOZIA VITREA
Authors: Matsuo Akihiko , Kubota Naoji , Uto Seiryû , Nakayama Mitsuru , Hayashi Shûichi , Yamasaki Kazuo
Published: July 2006

A novel sesquiterpene aldehyde, (−)-isobicyclogermacrenal, was isolated from Lepidozia vitrea, and its structure and absolute configuration were shown to be ent-isobicyclogermacren-14-al on the basis of the chemical and spectral evidence.
TOP-TOP AND TOP-SKELETAL TORSION COUPLING EFFECTS ON THE MICROWAVE SPECTRA OF trans-ETHYLMETHYLETHER
Authors: Shiki Yoshiko , Hayashi Michiro
Published: July 2006

Microwave spectra of trans-ethylmethylether and its four deuterated species in the ground and four lowest torsionally excited states were measured. The coupling effects among two methyl and skeletal torsions were analyzed.
INTRAMOLECULAR 1,3-DIPOLAR CYCLOADDITIONS OF IMINES OF GLYCINE ESTERS BEARING AN ALKYNYL FUNCTION
Authors: Tsuge Otohiko , Ueno Kazunori , Oe Koji
Published: July 2006

Imines of glycine methyl esters, o-propargyloxybenzylidene(methoxycarbonyl)methylamines, undergo an intramolecular cycloaddition via their 1,3-dipolar tautomers, azomethine ylides, to an alkynyl group. Initial cycloadducts were thermally converted to dehydrogenated compounds with concurrent migration of methoxycarbonyl group.
CHIRAL, SYNTHETIC BILAYER MEMBRANES
Authors: Kunitake Toyoki , Nakashima Naotoshi , Hayashida Shoichi , Yonemori Kazuyuki
Published: July 2006

Chiral dialkylammonium surfactants as synthesized from alanine and glutamic acid formed well-developed bilayer membranes when dispersed in water. The phase transition temperature did not differ between the chiral and racemic membranes, and induced circular dichroism was observed with chiral membranes when a hydrophobic azo dye was added.
A NEW ANALYTICAL METHOD OF INDIVIDUAL BILE ACIDS USING HIGH PERFORMANCE LIQUID CHROMATOGRAPHY AND IMMOBILIZED 3α-HYDROXYSTEROID DEHYDROGENASE IN COLUMN FORM
Authors: Okuyama Sumihiko , Kokubun Nobuhiko , Higashidate Sakae , Uemura Daisuke , Hirata Yoshimasa
Published: July 2006

We studied the use of immobilized enzyme, covalently bound to aminopropyl-CPG, to the analysis on free and conjugated individual bile acids. A microcolumn with the immobilized 3α-hydroxysteroid dehydrogenase was prepared and used in a system of high performance liquid chromatography (HPLC). Reduced NAD+ produced from bile acid by this enzyme was fluorimetrically determined with fluorometer. As the result, the free, glycine- and taurine-conjugated individual bile acids which were separated by the HPLC were determined on high sensitivity and specificity. Clinical trials were done for the serum of patients with hepatobiliary disease.
SYNTHESIS OF D:A-FRIEDO-18β,19αH-LUPAN-3-ONE AND D:B-FRIEDO-18β,19αH-LUP-5-EN-3β-OL AND A COMMENT ON THE STRUCTURE OF GUIMARENOL
Authors: Yokoyama Yasushi , Moriyama Yoshihiko , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi
Published: July 2006

D:B-Friedo-18β,19αH-lup-5-en-3β-ol was synthesized from friedelin via D:A-friedo-18β,19αH-lupan-3-one. The stereostructure of a 3α,4α-epoxide derived from the 3-one was determined by X-ray technique to show the 19αH configuration for both the epoxide and the 5-en-3β-ol, The disagreement of the spectral data of the synthetic 5-en-3β-ol with those of guimarenol is described.
SYNTHESIS OF 5-FLUORO-PRGSTAGLANDINS
Authors: Nakai Hisao , Hamanaka Nobuyuki , Miyake Hajimu , Hayashi Masaki
Published: July 2006

(5E)- And (5Z)-5-fluoro-prostaglandin(PG)F2α methyl esters 1 and 2 were synthesized via decarboxylative elimination reaction from key intermediate α-fluoro-β-hydroxy ester 7. 5-Fluoro-6-keto-PGE1 methyl ester 3 was also synthesized from the key intermediate 7. These 5-fluoro-PGs 1, 2 and 3 showed interesting biological properties.
NEW SESQUITERPENE LACTONES FROM EUPATORIUM SACHALINENSE (FR. SCHMIDT) MAKINO
Authors: Ito Kazuo , Sakakibara Yoshihisa , Haruna Mitsumasa
Published: July 2006

Three new germacranolide sesquiterpene lactones, peroxysachalinin, sachalinin, and sachalin, were isolated from Eupatorium sachalinense (Fr. Schmidt) Makino and their structures were described. An allyl hydroperoxy sesquiterpene lactone, peroxysachalinin, was characterized by spectral and chemical methods and prepared by photosensitized oxygenation of eupatoriopicrin which was a main component of this plant. Peroxysachalinin was converted to sachalinin with triphenylphosphine, whereas sachalinin was converted to sachalin.
CHARACTERIZATION OF γ-AMINOPROPYL AND N-β(AMINOETHYL)γ-AMINOPROPYL GROUPS IMMOBILIZED ON SILICA GEL BY USING CMR SPECTROSCOPY
Authors: Tanaka Kazuo , Shinoda Sumio , Saito Yasukazu
Published: July 2006

The organofunctional groups immobilized on silica gel, NH2CH2CH2CH2Si-(silica) and NH2CH2CH2NHCH2CH2CH2Si-(silica), have been characterized by CMR spectroscopy in the suspended state. The carbon adjacent to silicon showed substantial low-field shift and T1 reduction as a result of immobilization. The microenvironment of these amino and diamino groups resembles that in the homogeneous phase in appropriate solvents, owing to the permissible segmental motion of the three-carbon chain.
STEREOSELECTIVE DEUTERATION OF MALONATE METHYLENE HYDROGENS IN SOME BIS(MALONATO)COBALT(III) COMPOUNDS
Authors: Sakaguchi Ushio , Morito Kaiji , Yoneda Hayami
Published: July 2006

The base-catalysed hydrogen-deuterium exchange at the malonate methylenes takes place stereoselectively for [Co(mal)2(L)]n-, where mal = malonate ion, L = ethylenediamine, N-methylethylenediamine, glycinate ion, and sarcosinate ion, but not for cis-[Co(mal)2(NH3)2]−. The proton deuterated first is probably the one which is closer to the chelate L.
DEUTERATION OF ETHYLENE, PROPYLENE AND BUTENES ON Pt ELECTRODE IN DEUTERATED ACIDS—D2O SOLUTIONS
Authors: Kita Hideaki , Fujikawa Keikichi , Kubota Noriaki , Shimazu Katuaki
Published: July 2006

Deuteration of C2, C3 and C4, olefins was conducted at a platinum electrode in 0.5M D2SO4 or 1M DClO4–D2O solutions. In each case studied, deuteroparaffins reveal a common feature of a two maxima distribution; one is at partially deuterated paraffins and the other at perdeuteroparaffin. Appearance of the two maxima distribution clearly indicates the presence of two reaction paths. Isomerization during the deuteration of butene isomers was found small, 10∼30% of the total conversion.
THE ELECTRON CAPTURE REACTION OF METAL COMPLEX
Authors: Kuge Yoshio , Hattori Yukikazu , Asada Shingo , Yamada Shoichiro
Published: July 2006

The temperature dependence of the electron capture process was investigated for elucidating high electron capture sensitivity of the Cr(III) complexes of the ligands acetylacetone [H(acac)], trifluoroacetylacetone [H(tfa)], and hexafluoroacetylacetone [H(hfa)]. The electron affinity or the activation energy for the electron capture reaction were calculated for individual compounds.
A NOVEL 2-BUTYLAMINATION OF 1,4-DIHYDROXYANTHRAQUINONE PROMOTED BY METAL IONS
Authors: Matsuoka Masaru , Makino Yoshinobu , Yoshida Katsuhira , Kitao Teijiro
Published: July 2006

In the presence of cuprous or cupric chloride, 2-butylamino-1,4-dihydroxyanthraquinone was synthesized quantitatively from 1,4-dihydroxyanthraquinone and butylamine at ambient temperature.
FOREIGN METAL-DOPED SnO2 FILM ANODES FOR OXYGEN AND CHLORINE EVOLUTION
Authors: Iwakura Chiaki , Inai Meguru , Tamura Hideo
Published: July 2006

The anodic characteristics of foreign metal-doped SnO2 film electrodes, prepared by the thermal decomposition method, were studied in 1M KOH and 3M NaCl solutions. As a result, it was found that such electrodes have very attractive properties as anodes for oxygen and chlorine evolution.
FLUORESCENCE LIFETIME STUDIES ON THE INTERACTION OF DNA WITH 9-AMINOACRIDINE
Authors: Kubota Yukio , Motoda Yuko , Fujisaki Yasuo
Published: July 2006

The interaction of DNA with 9-aminoacridine has been studied by measuring fluorescence decay curves. The emitting sites of the dye on DNA (AT-rich regions) are found to exhibit fluorescence decay curves which can be resolved into three-exponential components corresponding to lifetimes of 1.6–2.4, 11–13, and 27–29 ns.
“ONE POT” DOUBLE CARBON–CARBON LINKAGES ON THE NEIGHBORING CARBONS VIA AN ENOL ETHER AS A REACTION INTERMEDIATE
Authors: Hosomi Akira , Hashimoto Hidehiko , Kobayashi Hiroshi , Sakurai Hideki
Published: July 2006

Two new “one pot” double alkylation reactions, 1) allylation of α,β-enones with allylsilanes and subsequent reaction with electrophiles, and 2) acylation of α-siloxyallylsilanes with acid halides followed by consecutive introduction of other electrophiles on the neighboring carbon atom, are reported.
COELENTRATE BIOLUMINESCENCE III. TRACE CHARACTERIZATION OF LUMINESCENCE SUBSTANCES OF CAVERNULARIA OBESA AND PTILOSARCUS GUERNEYI
Authors: Inoue Shoji , Kakoi Hisae , Murata Mikiko , Goto Toshio , Shimomura Osamu
Published: July 2006

Trace amount of luminescent substances of Cavernularia obesa and Ptilosarcus guerneyi were characterized to be Renilla luciferin and luciferyl sulfate using 100 g of C. obesa in quiescent state and 200 g of P. guerneyi in frozen state.
FISH BIOLUMINESCENCE II. TRACE CHARACTERIZATION OF THE LUMINESCENCE SYSTEM OF A MYCTOPHINA FISH, DIAPHUS ELUCENS
Authors: Inoue Shoji , Kakoi Hisae , Okada Kunisuke , Goto Toshio
Published: July 2006

Oplophorus luciferin (Ia) was characterized in a pair of nasal photophores of a myctophina fish, Diaphus elucens. Liver of the fish contains luciferin in a bound form, possibly as its enol ether. A luciferase active toward O. luciferin was extracted from flesh of the fish. From these results it is concluded that the luminescence system of D. elucens is similar to that of Oplophorus and not to that of Cypridina.
HYDROALKYLATION OF BENZENES WITH Pd–Al2O3 AND NaCl–AlCl3
Authors: Kamiyama Tsutomu , Enomoto Saburo , Inoue Masami
Published: July 2006

The synthesis of cyclohexylbenzenes by the hydroalkylation of benzene and toluene with a binary catalyst system was studied under various conditions. Using a catalyst of NaCl–AlCl3(fused salts) as an alkylation catalyst and 0.24%Pd–Al2O3 as a reduction catalyst, cyclohexylbenzene(54.7 mol%) was obtained at 140°C for 5 hr under the presence of hydrogen. Further, the activity and the selectivity of hydroalkylation were also examined with several combined catalysts of noble metals and fused salts.
A NEW FLAVONOID GLYCOSIDE FROM POLYGONUM NODOSUM
Authors: Isobe Takahiko , Fukushige Takeshi , Noda Yukinao
Published: July 2006

The structure of a new flavonoid glycoside with a molluscicidal activity which was isolated from Polygonum nodosum Pers. was elucidated as quercetin-3β-d-glucoside-2″-gallate by spectroscopic analysis.
REDUCTION-OXIDATION MECHANISM OF OXIDE CATALYSTS. OXYGEN DIFFUSION DURING REDOX CYCLES
Authors: Sakata Kanji , Nakamura Teiji , Misono Makoto , Yoneda Yukio
Published: July 2006

A new method was developed to determine under the conditions close to the reaction conditions whether or not the redox cycle of bulk metal oxide proceeds by the diffusion of lattice oxygen, and was applied to two examples; γ-Fe2O3 and La0.8Sr0.2CoO3. It has been demonstrated that iron in stead of oxygen diffuses rapidly with γ-Fe2O3 and oxygen rapidly diffuses with La0.8Sr0.2CoO3.
RESONANCE RAMAN SPECTRA OF INCLUSION COMPOUNDS OF SOME AZO DYES WITH CYCLODEXTRINS
Authors: Sato Hisao , Higuchi Seiichiro , Teramae Norio , Tanaka Shigeyuki
Published: July 2006

The resonance Raman spectra of the inclusion compounds of some azo dyes with cyclodextrins were measured, and the band shifts were examined. It was shown that some bands exhibited distinct shifts and others did not. The results seem to suggest that the Ph–N= group mainly involved in the formation of inclusion compounds.
ANALYSIS OF NITRITE ION IN WATER BY ELECTRON CAPTURE GAS CHROMATOGRAPHY
Authors: Funazo Koichi , Tanaka Minoru , Shono Toshiyuki
Published: July 2006

A new gas chromatographic procedure for the analysis of trace amount of nitrite ion in water has been developed. The procedure involves the conversion of nitrite ion into 3,4-dichlorobromobenzene which is subsequently determined by electron capture gas chromatography. The coexistence of chloride ion in a large amount with nitrite ion gives rise to the production of 1,2,4-trichlorobenzene in addition to 3,4-dichlorobromobenzene.
THE STEREOSELECTIVE FORMATION OF THREONINE FROM cis- AND trans-1-α-METHYLBENZYL-2-METHOXYCARBONYL-3-METHYL AZIRIDINES
Authors: Nakamura Isao , Harada Kaoru
Published: July 2006

The reaction of methyl α,β-dibromobutyrate with α-methylbenzylamine resulted in the formation of cis- and trans-1-α-methylbenzyl-2-methoxycarbonyl-3-methyl aziridines(II and III), which were converted to threonine predominantly upon the hydrolytic ring opening of the aziridines.
USE OF PHASE-TRANSFER CATALYSIS IN ORGANOMETALLIC REACTIONS: A CONVENIENT SYNTHESIS OF KETONES FROM ALKYL HALIDES AND IRON PENTACARBONYL
Authors: Kimura Yoshikazu , Tomita Yoshiro , Nakanishi Saburo , Otsuji Yoshio
Published: July 2006

The Fe(CO)5-aqueous NaOH reagent system in benzene in the presence of a phase-transfer catalyst reacts efficiently with alkyl halides to afford symmetrical and unsymmetrical ketones, depending on the structure of alkyl halides and procedures employed. The features of this reaction are discussed.
FACILE REDUCTION OF SULFOXIDES AND SULFIMIDES WITH THIOL/TRIMETHYLSILYL CHLORIDE SYSTEM
Authors: Numata Tatsuo , Togo Hideo , Oae Shigeru
Published: July 2006

Sulfoxides were found to be deoxygenated slowly with thiosilane (PhSSiMe3), while deoxygenation of sulfoxides with the thiosilane proceeded smoothly in the presence of a catalytic amount of tetra-butylammonium bromide. For a preparative purpose, a mixed system of thiol and trimethylsilyl chloride can be used successfully for both deoxygenation of sulfoxides and deimination of sulfimides.
REACTION OF ETHYL 3-OXOBUTANOATE AND ETHYL 4-BROMO-3-OXOBUTANOATE WITH BENZENE IN THE PRESENCE OF ALUMINUM CHLORIDE
Authors: Kato Tetsuzo , Kimura Hitoshi
Published: July 2006

Refluxing of ethyl 3-oxobutanoate (1) in benzene in the presence of aluminum chloride gave ethylbenzene (4), 9,10-dimethylanthracene (5), 3-phenylbutanoic acid (7), and 3-methyl-1-indanone (9). Similar reaction of ethyl 4-bromo-3-oxobutanoate (2) yielded 4, 5, 4-bromo-3-oxobutanoic acid (3), 3,4-diphenylbutanoic acid (8), and 3-phenyl-1-tetralone (10).
GAS CHROMATOGRAPHIC ANALYSIS OF HALOGENATED HYDROCARBONS IN AIR OVER JAPAN
Authors: Makide Yoshihiro , Tominaga Takeshi , Rowland F Sherwood
Published: July 2006

Preliminary measurements were conducted of atmospheric concentrations of CCl2F2, CCl3F, CCl2FCClF2, CH3CCl3, CCl4, CHCl=CCl2 and CCl2=CCl2 in remote and urban areas in Japan to determine accurate background levels as well as the profile of local pollution. Samples collected in all-metal canisters were analyzed with an extremely clean stainless steel high vacuum sampling and calibration system and an EC-GC.
THE REACTION OF O-ALKYL S,S-DIARYL PHOSPHORODITHIOATES WITH ALKYLOXYSTANNANES
Authors: Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

The reaction of O-alkyl S,S-diaryl phosphorodithioates with alkyloxytrialkylstannanes afforded the corresponding O,O-dialkyl S-aryl phosphorothioates in good yields.
TOTAL SYNTHESIS OF COLEONS, U AND V
Authors: Matsumoto Takashi , Takeda Shoji
Published: July 2006

The highly-oxygenated tricyclic diterpenes, coleon U and coleon V, were successfully synthesized starting from (+)-ferruginol via an intermediate, (+)-12-benzoyloxyabieta-8,11,13-triene-6β,11-diol.
AN ESTIMATION OF THE NUCLEOPHILICITIES AND THE NUCLEOFUGICITIES OF ANIONIC NUCLEOPHILES STUDIED IN THE REVERSIBLE FINKELSTEIN REACTIONS OF BENZYL DERIVATIVES IN ACETONITRILE—DISSOCIATIVE CHARACTER OF THE REACTION AS STUDIED BY THE NUCLEOFUGICITY APPROACH—
Authors: Hayami Jun-ichi , Hihara Nobuhisa , Kaji Aritsune
Published: July 2006

Nucleophilic and nucleofugic reactivities of the variety of anions were studied in reversible Finkelstein reactions of benzyl derivatives. A leaving anion plays a major role in determining the reaction rate while an attacking anion shows only a limited role.
A NEW SYNTHESIS OF ETHERS BY THE REDUCTION OF ALDEHYDES WITH PYRIDINE-BORANE IN TRIFLUOROACETIC ACID
Authors: Kikugawa Yasuo
Published: July 2006

Pyridine-borane in trifluoroacetic acid reduced aldehydes to symmetric ethers, and to unsymmetric ethers with the combination of alcohols.
ISOLATION AND STRUCTURE OF A 334 NM UV-ABSORBING SUBSTANCE, PORPHYRA-334 FROM THE RED ALGA PORPHYRA TENERA KJELLMAN
Authors: Takano Satoshi , Nakanishi Atsushi , Uemura Daisuke , Hirata Yoshimasa
Published: July 2006

A new amino acid with a maximum at 334 nm, supposed to be biogenetically related to the characteristic UV-absorbing compounds from the zoanthid Palythoa tuberculosa, has been isolated from Porphyra tenera Kjellman and its structure determined.
A NEW TYPE OF THERMAL DISPROPORTIONATION OF MIXED NICKEL(II) COMPLEXES
Authors: Hoshino Naomi , Fukuda Yutaka , Sone Kozo
Published: July 2006

Thermal decomposition of the mixed nickel(II) complexes, [Ni(tmen)(acac)(OH2)2]X(X=Br or I), occurs in the following two ways:

[Ni(tmen)(acac)(OH2)2]X→[Ni(tmen)(acac)2]+[Ni(tmen)X2] (1)

[Ni(tmen)(acac)(OH2)2]X→[Ni(tmen)(acac)]X (2)

The reaction(1) is favored by the bromide, and the reaction(2) by the iodide. Structures of these complexes in some organic solutions are also discussed.
POTASSIUM FLUORIDE ON CELITE. A VERSATILE REAGENT FOR C-, N-, O-, AND S-ALKYLATIONS
Authors: Ando Takashi , Yamawaki Junko
Published: July 2006

Celite coated with potassium fluoride was found to be an effective and economical reagent for hydrogen-bond-assisted reactions. C-, N-, O-, and S-alkylations were conveniently performed in high yields under mild conditions.
ABSORPTION SPECTRA AND PHOTOEMISSION OF CHLOROPHYLL-B MULTILAYERS
Authors: Nakahara Hiroo , Fukuda Kiyoshige , Inokuchi Hiroo
Published: July 2006

The monolayer of chlorophyll (Chi) b at the air/water interface has been examined by pressure–area isotherm and film thickness. Furthermore, with the multilayer of Chi b on the solid surface the visible absorption spectra and the external photoelectric effect in the vacuum ultraviolet region have been studied. The energy diagram has been proposed.
EFFECT OF ILLUMINATION INTENSITY ON STABILIZATION OF ZnO PHOTOANODES IN HALIDE SOLUTIONS
Authors: Kobayashi Tetsuhiko , Yoneyama Hiroshi , Tamura Hideo
Published: July 2006

The ratio of the photoanodic oxidation of halide ions in competition with the photoanodic dissolution of ZnO was investigated as a function of illumination intensity and concentration of halide ions. A relatively low illumination intensity was found to be desirable for stabilizing the photoanode in iodide solutions, while a high illumination intensity was favorable in bromide solutions. The energetic position of the quasi-Fermi level of positive holes relative to the decomposition potential of ZnO and to the redox potentials of halide ions seems to govern the phenomena.
UNSYMMETRICAL DITHIOCARBONATE p-TOLUENESULFONYLHYDRAZONE: GEOMETRICALLY SELECTIVE PREPARATIONS AND DETERMINATIONS OF THE Z-E STEREOCHEMISTRY
Authors: Nakai Takeshi , Mikami Koichi
Published: July 2006

Geometrically selective preparations of each of the stereoisomers of S-alkyl (or allyl)-S′-methyl-dithiocarbonate tosylhydrazones (1) are described. The Z-E stereochemistry of 1 has been determined by means of equilibration experiments and NMR methods. On the basis of the geometrical assignments of 1, the stereoselectivity in alkylations of sodium dithiocarbazates is discussed on mechanistic grounds.
A FACILE METHOD FOR THE α-METHYLENATION OF SULFONES
Authors: Ueno Yoshio , Setoi Hiroyuki , Okawara Makoto
Published: July 2006

The carbanion of α-monosubstituted β-benzoylsulfones reacted with formaldehyde under mild conditions to afford α-methylenated products (α-alkylated vinylsulfones) in high yield with the elimination of a benzoate anion.
SPECTROPHOTOMETRIC DETERMINATION OF NANOGRAM LEVEL OF COPPER(II) BY ITS CATALYTIC EFFECT
Authors: Nakano Shigenori , Sakai Masahiko , Tanaka Masaya , Kawashima Takuji
Published: July 2006

A new simple, sensitive and selective catalytic method for the determination of nanogram level of copper(II) is proposed. N,N-Di-methyl-p-phenylenediamine reacts with N,N-dimethylaniline to form Bindschedler’s Green leuco base (BGL) and in the presence of hydrogen peroxide, copper(II) catalyzes the oxidation of BGL to a colored compound (λmax=725 nm).
CATALYTIC ACTIVITY OF IRON OXIDE TREATED WITH SULFATE ION FOR DEHYDRATION OF 2-PROPANOL AND ETHANOL AND POLYMERIZATION OF ISOBUTYL VINYL ETHER
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

The catalytic activity of Fe2O3 for the title reactions was remarkably enhanced by exposing Fe(OH)3 or Fe2O3 prior to the crystallization to 0.1–1 N H2SO4 or (NH4)2so4 and then calcining in air at 500°C, its activity for the dehydration of ethanol being much higher than that of SiO2–Al2O3.
ONE STEP FORMATION OF ALKYNES FROM ARYL KETONES
Authors: Tsuji Takashi , Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

Aryl ketones are converted to the corresponding alkynes by the treatment with 2-chloro-3-ethylbenzoxazolium tetrafluoroborate in the presence of a large excess of triethylamine at room temperature.
OPTIMUM COMPOSITIONS OF Rh–Sn–γ–Al2O3 CATALYSTS FOR SIMULTANEOUS REDUCTION OF NITRIC OXIDE AND CARBON MONOXIDE
Authors: Masai Mitsuo , Nakahara Keisuke , Yabashi Masakazu
Published: July 2006

The simultaneous reduction of NO and CO on Rh–Sn–γ–Al2O3 was studied in reductive and oxidative atmosphere. The effect of alloying with Sn on catalytic activity was obviously observed in oxidative atmosphere. The reaction temperature lowered in the presence of O2. The optimum Rh/Sn atomic ratio decreased with increasing concentration of O2 in the reactant.
THE CATALYTIC ACTIVITIES OF METHANOL REFORMING CATALYSTS AND THEIR PREPARATIONS
Authors: Minochi Chiaki , Kobayashi Haruo , Takezawa Nobutsune
Published: July 2006

Methanol reforming reaction CH3OH + H2O = CO2 + 3H2 was carried out over copper-containing catalysts which were prepared from hydroxides of copper and from the hydroxide kneaded with silica. From differential thermal analysis, infrared and X-ray photoelectron spectra of the catalysts and other chemical analysis, it was concluded that the anionic group of their starting material readily exchanged with hydroxide ion in the hydroxide precipitate in the course of their preparation and greately influenced the reaction.
PHOTOOXYGENATION OF FLAVANONOL-RED AND UNUSUAL AUTOXIDATION OF PHOTOFLAVANONOL-RED
Authors: Shibata Kozo , Matsuo Kotaro , Ichikawa Nobutaka , Kubota Takashi
Published: July 2006

Photooxygenation of flavanonol-red gave photoflavanonol-red by oxidative cleavage of C–C double bond in good yield. In alkaline solution, the autoxidation of photoflavanonol-red afforded 3,4,7,8-dibenzonaphthyrone by unusual oxidative cleavage of C–C double bond.
α-HYDROXYBENZYL ANION EQUIVALENT: A CONVENIENT METHOD FOR THE SYNTHESIS OF α-HYDROXY KETONES UTILIZING α-TRIMETHYLSILYLOXYBENZYLPHOSPHONATE
Authors: Hata Tsujiaki , Hashizume Akio , Nakajima Masashi , Sekine Mitsuo
Published: July 2006

Diethyl α-trimethylsilyloxybenzylphosphonate was treated with lithium diisopropylamide in THF followed by acyl chloride or acyl anhydrides to give the acylated products in good yields. The acylated products were converted easily by mild alkaline treatment to acyloins predominantly along with α-diketones.
A CONVENIENT METHOD FOR THE PREPARATION OF PHOSPHORIC DIESTERS AND ITS APPLICATION TO THE SYNTHESIS OF PHOSPHOLIPIDS
Authors: Mukaiyama Teruaki , Morito Naoya , Watanabe Yutaka
Published: July 2006

Treatment of 2-alkyloxybenzoxazoles with bis(p-nitrophenyl) hydrogen phosphate resulted in the formation of alkyl bis(p-nitrophenyl) phosphates. The phosphates were then converted by the application of various alcohols in the presence of cesium fluoride to dialkyl p-nitrophenyl phosphates, which, on treatment with alkali, gave dialkyl hydrogen phosphates in good overall yields. These sequential reactions were successfully applied to a synthesis of several phospholipids.
CHARGE TRANSFER INTERACTION IN [3.3]METACYCLOPHANE QUINHYDRONE
Authors: Shinmyozu Teruo , Inazu Takahiko , Yoshino Tamotsu
Published: July 2006

syn-[3.3]Metacyclophane quinhydrone 1 was synthesized by oxidation of bisphenol 6 with thallium trifluoroacetate, followed by catalytic hydrogenation. The quinhydrone 1 showed a characteristic broad CT absorption in the region of 350–600 nm with a maximum at 446 nm (ε2510) in dioxane.
THE EFFECTS OF SUPPORTS ON THE REACTION OF NO WITH NH3 CATALYZED BY V2O5
Authors: Ueno Akifumi , Todo Naoyuki , Kurita Minoru , Hagiwara Hiroyuki , Nishijima Akio , Sato Toshio , Kiyozumi Yoshimichi
Published: July 2006

The reaction mechanism of the catalytic reduction of NO by NH3 was studied using V2O5–Al2O3 and V2O5–SiO2 catalysts. On V2O5–Al2O3the reaction rate was enhanced by the presence of oxygen and the reaction was found to proceed through the formation of NO2 adsorbed on the catalyst surface. While on V2O5–SiO2 no effects of oxygen were observed and the reaction seems to proceed through the formation of HNO adsorbed on the catalyst, since N2O, which may be produced by the decomposition of HNO adsorbed, was detected during the reaction.
A KINETIC STUDY OF THE REACTION OF THE 5,5,7R(S),12,12,14R(S)-HEXAMETHYL-1S(R),4S(R),8S(R),11S(R)-TETRAAZACYCLOTETRADECANENICKEL(II) ION AND DIMETHYLSULFOXIDE INVOLVING A SINGLET-TRIPLET SPIN-STATE EQUILIBRIUM
Authors: Masuda Yukiyasu , Endo né , Ito Tasuku , Yoshida Noboru , Fujimoto Masatoshi
Published: July 2006

A kinetic study on the spin-state equilibrium in dimethylsulfoxide-water media, [NiL]2+ (singlet, square planar) + 2 DMSO \ightleftharpoons [NiL(dmso)2]2+ (triplet, pseudo Oh), is carried out with a temperature-jump method, where L denotes the title ligand (here-after abbreviated as α-rac-Me6[14]aneN4). The results are consistent with a two-step mechanism involving a rate-determining step [NiL(dmso)]2+ \ightleftharpoons [NiL]2+ + DMSO via formation of a 5-coordinated intermediate [NiL(dmso)]2+.
THE PREPARATION OF NEW[2.2]METACYCLOPHANEQUINONES
Authors: Tashiro Masashi , Yamato Takehiko
Published: July 2006

The convenient preparative method of anti-[2.2]metacyclophanequinone (4) and 5-t-butyl-8-methoxy[2](2,6)-p-benzoquinono[2]metacyclophane (5) is described.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON THE PHOTOCHEMICAL REACTION OF ISOQUINOLINE N-OXIDE IN VARIOUS ALCOHOLS
Authors: Hata Norisuke , Ono Yumiko , Nakagawa Fumiaki
Published: July 2006

The external magnetic field effect on the photochemical reaction of isoquinoline N-oxide was studied in methanol, 2-propanol or tert-butyl alcohol. Consequently, the yield of lactam was found to show a minimum at higher fields with a decrease in the pKa value of alcohol used as a solvent, supporting the previously proposed mechanism of the photochemical magnetic field effect.
HEXADIENE FORMATION FROM 2-PROPANOL OVER CALCIUM PHOSPHATE CATALYST
Authors: Sodesawa Toshiaki , Nakajima Hirotaka , Nozaki Fumio
Published: July 2006

Hexadiene formation from 2-propanol over calcium phosphate catalyst was observed and studied from the standpoint of acid-base catalysis. Maximum conversion to hexadiene was obtained at 425°C. The hexadiene formation was suppressed remarkably by the addition of phenol, while its formation was not so much controlled by the pyridine addition.
PHOTOUREIDOMETHYLATION OF 9-CYANOPHENANTHRENE WITH TETRAMETHYLUREA INVOLVING THE CHARGE-TRANSFER PROCESS IN THE EXCITED TRIPLET STATE
Authors: Tsujimoto Yuji , Hayashi Mitsunori , Miyamoto Takuji , Odaira Yoshinobu , Shirota Yasuhiko
Published: July 2006

Irradiation of an acetonitrile solution of a mixture of 9-cyanophenanthrene and tetramethylurea gave an ureidomethylated product in a high yield, the reaction being regioselective and solvent-dependent. It is indicated that the reaction involves the charge-transfer process in the excited triplet state of 9-cyanophenanthrene.
PHOTOREDUCTION AND REDOX CATALYSIS OF AN AMPHIPATHIC DERIVATIVE OF TRIS (2,2′-BIPYRIDINE)RUTHENIUM(II) AT THE MICELLAR SURFACE
Authors: Tsutsui Yasuhiro , Takuma Keisuke , Nishijima Toyoki , Matsuo Taku
Published: July 2006

On the flash photolysis of an amphipathic derivative of tris(2,2′-bipyridine)ruthenium(II), the highest yield for photoreduction of the complex by N,N′-dimethylaniline was obtained with the micellar solutions of a cationic surfactant (CTAC). The kinetic studies proved that catalytic reduction of various substrates smoothly proceeded via the reduced ruthenium complex at the micellar surface.
SYNTHESIS OF 16,16-(2-FLUOROTRIMETHYLENE)-PROSTAGLANDINS AND 16,16-(2,2-DIFLUOROTRIMETHYLENE)-PROSTAGLANDINS
Authors: Nakai Hisao , Hamanaka Nobuyuki , Kurono Masayasu
Published: July 2006

Synthesis of the new prostaglandin(PG) analogs, 16,16-(2-fluorotrimethylene)-PGE2 and -PGE1, 16,16-(2,2-difluorotrimethylene)-PGE2 and -PGE1 is reported. These new PG analogs have higher biological activities but lower side-effects than the natural PGs.
SYNTHESES OF (±)-WARBURGANAL AND (±)-ISOTADEONAL
Authors: Ohsuka Akio , Matsukawa Akira
Published: July 2006

Methyl (±)-9-epidrimenate was oxidized with selenium dioxide at C-12 to give an aldehyde ester. The aldehyde group was protected by formation of an acetal, and then the methoxycarbonyl group was transformed into a formyl group. Hydrolysis of the acetal group gave (±)-isotadeonal. Stereoselective oxidation of the enolate generated from (±)-isotadeonal monoacetal gave (±)-warburganal monoacetal, which was hydrolyzed to (±)-warburganal.
31P NMR STUDIES ON THE MECHANISM OF ASYMMETRIC HYDROGENATION CATALYZED BY RHODIUM(I) COMPLEXES WITH CHIRAL PYRROLIDINODIPHOSPHINE LIGAND. EVIDENCE FOR EXTREMELY REGIOSELECTIVE COMPLEXATION OF PROCHIRAL SUBSTRATES
Authors: Ojima Iwao , Kogure Tetsuo
Published: July 2006

31P {1H} NMR studies on the key intermediate complex of asymmetric hydrogenation, [(L*–L)Rh(S–S′)]+ClO4− (L*–L = pyrrolidinodiphosphine, BPPM and PPPM; S–S′ = itaconic acid and α-acetamidoacrylic acid), revealed that the mode of the bidentated complexation of the prochiral substrate is extremely regioselective and stereoselective. A possible mechanism for chiral recognition of enantiofaces is proposed.
GRAYATHOL A, A NEW DITERPENE FROM LEUCOTHOE GRAYANA MAX.
Authors: Furusaki Akio , Gasa Shinsei , Hamanaka Nobuyuki , Ikeda Ryuzo , Matsumoto Takeshi
Published: July 2006

The structure of a new diterpene, grayathol A, has been shown to have a stereoisomeric grayanane skeleton by X-ray analysis.
SYNTHESIS AND LUMINESCENCE SPECTRA OF THE COBALT(II) COMPLEX WITH KOJATE
Authors: Muto Masayuki , Yokota Satoru , Yamamoto Yusuke , Nakahara Masayoshi , Mori Wasuke
Published: July 2006

A new complex, Co(koj)2·H2O (Hkoj: kojic acid), was synthesized, and its IR spectrum indicated that kojates in it are coordinated to cobalt as bidentate ligands. When the complex was excited with ultraviolet light, it exhibited luminescence spectra having maxima at about 20000 cm−1 in aqueous and acidic solutions, and even in the solid state.