bluuebunny/crossref_metadata_2025 huggingface dataset:
13C-NMR SPECTRA OF N-BENZYLIDENEANILINES. EVIDENCE FOR DELOCALIZATION OF N-LONE-PAIR ELECTRONS TO ANILINE BENZENE RING
Authors: Yoshida Masato , Minato Hiroshi , Kobayashi Michio
Published: July 2006

Several N-benzylideneanilines were synthesized which possess anilino benzene rings rotated out of the Ar–C=N plane by various degrees due to steric hindrance. Their 13C-NMR spectra indicated that the N lone pair electrons are delocalized to ring A especially in the compounds in which ring A is forced to rotate out of the molecular plane.
REACTIONS OF DIPHENYLCYCLOPROPENONE WITH N-SULFINYLAMINES IN THE PRESENCE OF NICKEL TETRACARBONYL
Authors: Baba Akio , Ohshiro Yoshiki , Agawa Toshio
Published: July 2006

The reactions of diphenylcyclopropenone with N-sulfinylanilines in the presence of nickel tetracarbonyl gave pyrrolines, 1,3,4-triphenylpyrroline-2,5-dione (IIIa) and 1-p-tolyl-3,4-diphenylpyrroline-2,5-dione (IIIb). In these reactions, exchanges of C=O for S=O were observed. On the other hand, the reaction with N-sulfinylcyclohexylamine gave a 1:1 cycloadduct, 2-cyclohexyl-4,5-diphenyl-3-isothiazolone-1-oxide (IVc) in 36% yield without an exchange.
REACTIONS OF N-BROMO DERIVATIVES OF 2-IMINOBENZOTHIAZOLINES WITH THEIR N-GRIGNARD-TYPE REAGENTS
Authors: Akiba Kin-ya , Ishikawa Kiyofumi , Inamoto Naoki
Published: July 2006

3-(3′-Methylbenzothiazolinylideneamino)-4-methyl-1,2,4-benzothiadiazine, the ring-enlarged product, was obtained in 67% yield in the reaction of 2-bromoimino-3-methylbenzothiazoline with N-Grignard-type reagent of 2-imino-3-methylbenzothiazoline. On the other hand, bis[o-(N-phenylcyanamino)phenyl] disulfide was obtained in 65–87% yield in the reaction of 3-susbtituted 2-bromoiminobenzothiazoline with N-Grignard-type reagent of 2-imino-3-phenylbenzothiazoline which proceeds via the oxidation of the thiolate with the bromide, the former being produced by ring-opening equilibrium of the N-Grignard-type reagent.
A CONVENIENT METHOD FOR THE PREPARATION OF SYMMETRICAL POLYOLEFINS. —SYNTHESIS OF β-CAROTENE—
Authors: Ishida Akihiko , Mukaiyama Teruaki
Published: July 2006

Various carbonyl compounds undergo the reductive dimerization to produce symmetrical olefins in high yields on treatment with low valent titanium compounds, formed in situ from TiCl4 and LiAlH4, in the presence of a tertiary amine such as 1,8-bis(dimethylamino)-naphthalene or tri-n-butylamine. This method is successfully applied to the direct synthesis of β-carotene (6) from retinal (5).
THERMAL 1,6-ADDITION OF THE CHARGE–TRANSFER COMPLEXES OF 7,7,8,8-TETRACYANOQUINODIMETHAN-METHOXYTOLUENE SYSTEMS
Authors: Ohashi Mamoru , Nakayama Noboru , Yamasaki Kazuyuki
Published: July 2006

Treatment of TCNQ with o-, m-, and p-methoxytoluene gave the corresponding 1,6-addition products similar to those obtained from the photochemical addition of toluene to TCNQ but different from those obtained from the thermal addition of o-cresol to TCNQ. The reaction was accelerated in the presence of a proton donor, suggesting the participation of a proton-transfer step.
FORMIC ACID REDUCTION XXV. A SELECTIVE REDUCTION OF CARBON–CARBON DOUBLE BONDS CONJUGATED WITH NITRO, CYANO, OR SULFONYL GROUP
Authors: Nanjo Katsumi , Suzuki Kunio , Sekiya Minoru
Published: July 2006

It has been found that the carbon–carbon double bonds conjugated with nitro, cyano, or sulfonyl group were selectively reduced by heating with the azeotrope, composed of formic acid and triethylamine, in N,N-dimethylformamide.
PREPARATION OF ORGANOMETALLIC COBALT(III)-SCHIFF-BASE COMPLEXES CONTAINING KETONE OR NITROMETHANE
Authors: Fujii Yuki , Yoshizawa Tadashi
Published: July 2006

A series of new mixed cobalt(III)-Schiff-base complexes with the general formula of [Co(acac2en)(L)(H2O)], where L = monoanion of acetone, methylethylketone, acetophenone, or nitromethane, have been prepared from [Co(acac2en)] and L by air oxidation. The organic ligand, L, has been found to coordinate to cobalt(III) ion with its active methylene group.
CYCLIZATION OF POLYENES XX, BROMO ETHERIFICATION OF UNSATURATED ALCOHOLS AND KETONES
Authors: Kato Tadahiro , Ichinose Isao , Hosogai Takeo , Kitahara Yoshio
Published: July 2006

By the reaction of 2,4,4,6-tetrabromocyclohexadienone (I, TBCO) with unsaturated alcohols (III and VI) and ketones (IX), it was found that the corresponding bromo ethers (IV and VIII) and (X) were obtainable in moderate yields.
DEALKYLATION OF ALKYL ARYL ETHERS BY NITRITE ION
Authors: Sakai Tamio , Yasuoka Nobuhisa , Minato Hiroshi , Kobayashi Michio
Published: July 2006

When an alkyl aryl ether possessing an electron-withdrawing substituent at its para position was heated with sodium nitrite in HMPA, it was dealkylated and the corresponding phenol was formed. This novel reaction was studied with various alkyl aryl ethers using oxygen-18 and an optically-active compound, and this ether cleavage was found to proceed by an SN2 attack of nitrite on the alkyl carbon atom.
MICROWAVE SPECTRA OF cis- AND skew-IMETHYLVINYLSILANE
Authors: Hayashi Michiro , Imachi Misako
Published: July 2006

Microwave spectra of cis and skew isomers of methylvinylsilane were studied in relation to their molecular structures, dipole moments and barriers to internal rotation of the methyl group. The results were compared with those of cis and skew isomers of butene-1.
THE VIBRATIONAL SPECTRA AND ROTATIONAL ISOMERISM OF ETHYL METHYL SELENIDE AND METHYL i-PROPYL SELENIDE
Authors: Ohno Keiichi , Hirokawa Takeshi , Aono Seiro , Murata Hiromu
Published: July 2006

The vibrational spectra of dimethyl selenide, ethyl methyl selenide, and methyl i-propyl selenide were measured in the gaseous, liquid, and solid states. The rotational isomers about the C–Se bond were confirmed to exist for ethyl methyl selenide and methyl i-propyl selenide.
REDUCTIVE CYCLIZATION OF NONCONJUGATED ACETYLENIC KETONES TO 2- METHYLENECYCLOPENANOLS
Authors: shono Tatsuya , Nishiguchi Ikuzo , Omizu Hiroshi
Published: July 2006

Electroreduction of series of γ-ethynl ketones in dimethylformamide gave the cyclization products, 2-methylenecyclopentanols, as the sole product in excellent yeilds. furthermore, this electrochemical techniqe was applied to a new synthesis of bicyclic alcohols with an exocyclic double bond adjacent to a bridgehed hydroxy group.
α-ALKYLATION AND α-ARYLATION OF CARBONYL GROUPS: NICKEL-PHOSPHINE COMPLEX-CATALYZED GRIGNARD COUPLING OF vic-BROMOTRIMETHYLSILOXYALKENES
Authors: Tamao Kohei , Zembayashi Michio , Kumada Makoto
Published: July 2006

In the presence of [Ni(dppp)Cl2] as a catalyst, vic-bromotrimethylsiloxyalkenes (1)couple with Grignard reagents to produce alkylated and arylated silyl enol ethers, or, after acid hydrolysis, the corresponding α-alkylated and α-arylated carbonyl compounds. In these reactions, 1 can be regarded as an enolonium equivalent.
AN ANOMALISM OF THE ELECTRIC FIELD GRADIENT AROUND IRON NUCLEUS OBSERVED IN POLYCHLORINATED FERROCENES
Authors: Motoyama Izumi , Shimojima Noriko , Iijima Sei-ichiro , Sano Hirotoshi
Published: July 2006

An anomalously large value of the quadrupole splitting has been observed in the 57Fe Mössbauer resonance spectra of octa- and decachloroferrocenes and discussed in terms of electronic and steric influence of the substituent on the Mössbauer parameters.
REACTIONS OF 2,2,2-TRIFLUOROETHOXY- AND 2 , 2,2-TRIFLUOROETHYLTHIOBENZENE WITH LITHIUM DIALKYLAMIDES. THE FORMATION OF PHENYLTHIOYNAMINES
Authors: Nakai Takeshi , Tanaka Kiyoshi , Ishikawa Nobuo
Published: July 2006

Reactions of 2,2,2-trifluoroethoxy-(2) and 2,2,2-trifluoroethylthiobenzene (3) with excess lithium dialkylamides afforded the difluorovinyl ether (4) and the phenylthioynamines (5) , respectively. Thus the latter reaction provides a convenient method for preparing these particular ynamines. Such striking difference in reaction course between 2 and 3 is discussed in terms of the relative stability of carbanions involved.
REACTION OF DIAZOKETONES IN THE PRESENCE OF METAL CHELATES. REACTION WITH β-DIKETONES
Authors: Ibata Toshikazu , Hamaguchi Masashi , Nishigaki Hideo
Published: July 2006

Copper chelate catalyzed decomposition of substituted α-diazoacetophenones and ethyl diazoacetate in the presence of dibenzoylmethane and benzoylacetone gave two types of products; one was that of formal insertion product of ketocarbene into C–H bond, and the other was into C–CO bond of β-diketone. These products were explained by the cyclopropanation of ketocarbene with C=C double bond of enol form of β-diketone followed by ring opening and proton shift.
EQUILIBRIUM AND KINETIC STUDIES OF THE REACTION OF N-2-HYDROXYETHYLETHYLENEDIAMINE-N,N′,N′-TRIACETATOAQUACHROMIUM(III) WITH AZIDE ION
Authors: Ogino Hiroshi , Shimura Makoto , Tanaka Nobuyuki
Published: July 2006

The equilibrium constant (k) and the rate constants (kf and kb) of the reaction,

Cr(hedtra)(H2O)+N3−(Remark: Graphics omitted.)Cr(N3)(hedtra)−+H2O

were determined to be 113±9 M−1 for K, 19.9±1.1 M−1 s−1 for kf and 0.176±0.010 s−1 for kb at an ionic strength of 1.0 (NaClO4) and 25°C. The reaction is considered to proceed through an associative interchange mechanism.
RESONANCE RAMAN SPECTROSCOPIC DETECTION OF ELECTROCHEMICALLY GENERATED DIANION OF NAPHTHACENE
Authors: Ikeshoji Tamio , Mizuno Toshihiko , Sekine Taro
Published: July 2006

Resonance Raman and visible absorption spectra of the naphthacene dianion generated by electrolytic reduction from the naphthacene anion radical were measured in tetrahydrofuran in the absence of any supporting electrolyte. The resonance Raman scattering from the dianion located near a cathode was successfully observed when the intensity of laser light as an exciting source was reduced to prevent the convection of the dianion by thermal effect.
CdS-ELECTROCHEMICAL PHOTOCELL WITH S2− ION-CONTAINING ELECTROLYTE
Authors: Minoura Hideki , Oki Takeo , Tsuiki Masayasu
Published: July 2006

S2− ion in the electrolyte of CdS-electrochemical photocell makes the flatband potential of CdS electrode shift remarkably toward the cathodic direction and also makes this electrode photoelectrochemically stable. The possibility of an efficient electrochemical photocell with CdS electrode has been demonstrated by the polarization characteristics .
HIGH PRESSURE CELLS FOR THE STUDY OF MODERATELY FAST REACTION IN SOLUTION
Authors: Sasaki Muneo , Okamoto Masami , Tsuzuki Hideaki , Osugi Jiro
Published: July 2006

A technique for the study of moderately fast reaction in solution up to 2000 kg/cm2 was developed. Two types of cells were devised and applied to the thermal measurement of the cationic polymerization of tetrahydrofuran and spectrophotometric one on the reaction of tetracyanoethylene with vinyl ethyl ether.
CHEMISTRY OF SUPEROXIDE ION. REACTION OF SUPEROXIDE ION WITH SUBSTRATES HAVING LABILE HYDROGENS
Authors: Moro-Oka Yoshihiko , Chung Pyoung Jin , Arakawa Hironori , Ikawa Tsuneo
Published: July 2006

The reactions between superoxide ion with substrates having labile hydrogens were examined by using KO2-18-crown-6-DMSO system. Superoxide ion abstracts hydrogen from the substrate, only when formed radical can be highly stabilized by conjugating π-electrons
1,2-CARBONYL TRANSPOSITION IN SOME KETONES
Authors: Shono Tatsuya , Nishiguchi Ikuzo , Nitta Masahiro
Published: July 2006

The electrochemical method of the introduction of α-acetoxy or α-methoxy group on a ketone was applied to accomplish the 1,2-carbonyl transposition in ketones. The acid-catalyzed reaction of β-acetoxy or β-methoxy alcohols prepared by the reduction or Grignard reaction of the α-acetoxy or α-methoxy ketones gave the 1,2-carbonyl transposed ketones.
TRICHLORO- AND TRIBROMOTRIS{TRICHLOROSTANNATO(II)}RHODATES(III)
Authors: Kimura Takashi , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatsujiro
Published: July 2006

Tetramethylammonium salt of trichlorotris{trichlorostannato(II)}rhodate (III), [(CH3)4N]3[RhCl3(SnCl3)3] was prepared by treating rhodium trichloride with tin (II) chloride in hydrochloric acid solution. The complex rapidly changed to [RhBr3(SnCl3)3]3− in the presence of Br− in hydrochloric acid solution. Both these complexes are new six-coordinate rhodium(III) complexes which can be considered to be facial.
RADICAL TRANSFORMATION IN SOME GAMMA-IRRADIATED POLY-α-OLEFINS
Authors: Kusumoto Naoshi
Published: July 2006

Some gamma-irradiated poly-α-olefins showed the change of ESR spectra from a complexed pattern to a simple singlet at room temperature. This was well elucidated by a reaction kinetic study on the assumption that short life radicals were transformed into stable ones.
S,S-DI-2-PYRIDYL DITHIOLOPHOSPHATE AS A KEY INTERMEDIATE IN THE PHOSPHORYLATION BY OXIDATION-REDUCTION CONDENSATION
Authors: Hashimoto Mitsunori , Ueki Masaaki , Mukaiyama Teruaki
Published: July 2006

A key intermediate of phosphorylation by oxidation-reduction condensation which is useful for the preparation of various nucleotides was studied by means of 31P NMR using methanephosphonate as a model compound. The intermediate, S,S-di-2-pyridyl methanedithiolophosphonate, was formed quite rapidly by the reaction of methanephosphonic acid and triphenylphosphine-d15-2,2′-dithiodipyridine (PyS)2 in anhydrous pyridine and could be stored in solution.
SELECTIVE HYDROGENATION OF CONJUGATED DIOLEFINS TO MONOOLEFINS CATALYZED BY A POLYMER-PALLADIUM COMPLEX
Authors: Nakamura Yoshio , Hirai Hidefumi
Published: July 2006

A polymer–palladium complex prepared from palladium(II) chloride and styrene-divinylbenzene copolymer with iminodiacetic acid groups is found to catalyze the selective hydrogenation of conjugated diolefins to monoolefins at 30°C under an atmospheric hydrogen pressure.
A NOVEL ACETYL MIGRATION REACTION FROM OXYGEN TO OXYGEN IN A PYRIDOXINE DERIVATIVE PROMOTED BY METAL IONS
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi , Emoto Sakae
Published: July 2006

2′-Acetoxy-3-acetyl-4′,5′-O-isopropylidenepyridoxine (I) was specifically converted to 2′-acetoxy-4′-acetylpyridoxine (III) in acetone in the presence of metal ions such as zinc, copper(II), iron(III), and aluminium in varying degree. Of these catalysts ferric ion was the most effective to complete the migration reaction. In the other pyridoxine analogues, no migration reaction was induced by these catalysts.
TRANSPOSITION OF LACTONE IN SESQUITERPENE LACTONE: CHEMICAL TRANSFORMATION OF α-SANTONIN INTO SESQUITERPENE α-METHYLENE-γ-LACTONE, YOMOGIN
Authors: Yamakawa Koji , Nishitani Kiyoshi , Yamamoto Akihiro
Published: July 2006

The chemical transformation of of α-santonin (I) into yomogin (II) was investigated. Introduction of an oxygen function at C-8 of trienone (V) was effected by tert-butyl chromate to give dione (VII), Partial reductive lactonization converted VII to XIII-XV. Phenylselenenylation of XIII gave XVI which was then syn-eliminated to give yomogin (II).
A NEW SYNTHESIS OF PRUMYCIN
Authors: Yoshimura Juji , Hashimoto Hironobu , Nishide Tetsuo
Published: July 2006

Prumycin (4-d-alanylamino-2-amino-2,4-dideoxy-l-arabinose) was synthesized from d-xylose through nine-step conversions.
DEHYDRATIVE CONDENSATION OF BENZOPHENONE WITH AMMONIA CATALYZED BY ION-EXCHANGE RESINS AND ITS APPLICATION TO AZINE SYNTHESIS
Authors: Hayashi Hiromu , Kawasaki Kengo , Mori Masataka
Published: July 2006

Diphenylmethanimine was selectively formed by passing ammonia through benzophenone at 200°C in the presence of ion-exchange resins. Attempts were made to obtain azine directly from benzophenone, ammonia and oxygen using the resins with CuCl and revealed acidic resins to be active while basic ones less active.
SYNTHESIS OF 16-METHYLENE-PROSTAGLANDINS AND 16,16-ETHANO-PROSTAGLANDINS
Authors: Miyake Hajimu , Iguchi Sadahiko , Kori Seiji , Hayashi Masaki
Published: July 2006

Synthesis of the new prostaglandin (PG) analogs sensitive to acid, 16-methylene-PGF2α methyl ester, 16-methylene-PGE2 methyl ester, 16,16-ethano-PGF2α methyl ester, and 16,16-ethano-PGE2 methyl ester, is reported. These PG analogs have higher biological activities but have fewer side-effects.
NEW SYNTHESIS OF (±)-SEMPERVIROL
Authors: Matsumoto Takashi , Usui Shuji , Fukui Kenji
Published: July 2006

The new synthesis of (±)-sempervirol (I) was described. Condensation of β-cyclocitral (II) with 4-isopropyl-3-methoxybenzyl chloride (XII) gave an alcohol (XIII), which by oxidation and subsequent intramolecular cyclization gave trans- and cis-fused 6-oxo compounds (XV and XVI). Both XV and XVI were respectively converted into (±)-I.
HETERA-p-CARBOPHANES. VII. MINOR IMPORTANCE OF THE RING CURRENT EFFECT ON CARBON-13 CHEMICAL SHIFTS OF THE ANSA CARBONS IN DIOXADIOXO[n]PARACYCLOPHANES
Authors: Sakamoto Kazuhiko , Oki Michinori
Published: July 2006

13C NMR spectra of a series of dioxadioxo[n]paracyclophanes are observed to compare with those of open-chain analogs. The ring current effect of the benzene ring is found to be of minor importance in determining the chemical shifts of the carbons in the ansa chain.
THERMAL RACEMIZATION OF VARIOUS S-O-ANISYL S-PHENYL N-(SUBSTITUTED)SULFILIMINES
Authors: Moriyama Masaru , Furukawa Naomichi , Numata Tatsuo , Oae Shigeru
Published: July 2006

Small electronic effects were discernible for rates of thermal racemization of various S-o-anisyl S-phenyl N-(substituted)sulfilimines. The rate was retarded by the electron-withdrawing group on the nitrogen atom. A correlation was found further between the rate and the streching frequency ( νS-N).
REACTIONS OF OXOSULFONIUM YLIDES WITH KETENES. THE FORMATION OF ENOL-LACTONES AND DIHYDROFURANONES
Authors: Tsuruoka Hideki , Kasai Shigeaki , Takebayashi Matsuji , Ibata Toshikazu
Published: July 2006

The reaction of diphenyloxosulfonium p-methoxyphenacylide with dialkyl- or alkylaryl-ketenes gave enol-lactones in good yields, whereas the reaction of diphenyloxosulfonium phenacylide with diarylketenes led to dihydrofuranones besides the enol-lactones.
INFRARED SPECTRA OF CARBON MONOXIDE CHEMISORBED ON SUPPORTED PLATINUM AGGREGATES PREPARED FROM Pt CARBONYL CLUSTER COMPOUNDS
Authors: Ichikawa Masaru
Published: July 2006

Supported Pt aggregates have been prepared by pyrolysis of Pt15–Pt6 carbonyl cluster compounds highly dispersed on SiO2 gel and γ-Al2O3, which showed the characteristic carbonyl ir spectra in CO chemisorption.
PERIPHERAL CONJUGATE SYSTEMS 1. CYCLOADDITION OF INDOLIZINE TO ELECTRON-DEFICIENT OLEFIN
Authors: Ikeda Sigehiko , Kajigaeshi Shoji , Kanemasa Shuji
Published: July 2006

Indolizines reacted with esters of maleic and acrylic acid to give 1,2,5,7a-tetrahydropyrrolo[2,1,5-cd]indolizine derivatives which would be presumably derived from [8+2] cycloaddition and subsequent 1,5-hydrogen shift, while with maleimide and maleic anhydride were obtained Michael adducts as main products. The stereochemistry and mechanism of the reactions were also discussed.
SYNTHESIS OF UNSYMMETRICAL KETONES BY THE REDUCTION OF 2-ALKOXYPYRIDINIUM SALTS FORMED FROM α-HYDROXY KETONES (ACYLOINS) WITH SODIUM HYDROSULFITE
Authors: Wada Makoto , Imaoka Masanori , Mukaiyama Teruaki
Published: July 2006

α-Hydroxy ketones (acyloins) were reduced to the corresponding ketones in good yields via pyridinium salts by the successive treatment with 1-methyl-2-fluoropyridinium p-toluenesulfonate and sodium hydrosulfite.
RAPID RACEMIZATION OF THE RADICAL ANIONS OF 1,1′-BINAPHTHYL AND 9,10-DIHYDRO-3,4;5,6-DIBENZOPHENANTHRENE
Authors: Ito Osamu , Hatano Masahiro
Published: July 2006

The radical anions of 1,1′-binaphthyl and 9,10-dihydro-3,4;5,6-dibenzophenanthrene racemize more rapidly than the corresponding neutral compounds without cleavage of the 1,1′ bond.
PRODUCTION OF 61Cu BY α- AND 3He BOMBARDMENTS ON COBALT TARGET
Authors: Homma Yoshio , Murakami Yukio
Published: July 2006

For the production of 61Cu for medical use, natural cobalt was bombarded with α or 3He particles up to 40 MeV. The best bombardment conditions were determined on detailed examination of the excitation curves and thick-target yield curves for 61Cu and the by-product nuclides. 6 mCi/μAh of 61Cu could be obtained by bombardment with 40 MeV α particle and separated by anion exchange method with high radiochemical purity in carrier-free state.
DETECTION OF MOLECULAR IONS OF THERMALLY UNSTABLE COMPOUNDS BY IN BEAM ELECTRON IMPACT
Authors: Ohashi Mamoru , Tsujimoto Kazuo , Yasuda Akiyoshi
Published: July 2006

Some remarkable characteristics of “in beam” electron impact spectra of several thermally unstable compounds have been reported. The spectra almost always exhibited the M+1 peak in place of M. Intensities of M+1 peaks of several thermally unstable compounds, of which molecular ion peaks are not observed with conventional direct inlet systems, are reported.
METAL-ASSISTED TERPENOID SYNTHESIS II. CATALYTIC CONVERSION OF ISOPRENE INTO FARNESENE AND ITS ISOMER, 2,6-DIMETHYL-10-METHYLENE-1,6-TRANS,11-DODECATRIENE
Authors: Akutagawa Susumu , Taketomi Takanao , Otsuka Sei
Published: July 2006

A highly selective isoprene trimerization to 2,6-dimethyl-10-methylene-1,6-trans,11-dodecatriene(1) and its double bond isomer, natural β-trans-farnesene (2) was achieved with nickel catalysts. The hydrogen migration pathway crucial for the regio- and stereoselective linear oligomerization was studied to derive a plausible reaction scheme.
METAL COMPLEXES OF SULFHYDRYL-CONTAINING PEPTIDES : NICKEL(II) COMPLEX OF 2-MERCAPTOPROPIONYLGLYCINAMIDE IN COMPARISON WITH 2-MERCAPTOPROPIONYLGLYCINE
Authors: Sugiura Yukio , Takeyama Toshiko , Tanaka Hisashi
Published: July 2006

The pKc1 (7.40) and pKc2 (8.04) values for deprotonation of the peptide and terminal amide groups in the 1:1 2-mercaptopropionylglycinamide(2-MPGA)-Ni(II) complex were determined. In the 1H NMR spectrum of 2-MPGA-Ni(II) complex, the methylene protons of the ligand were observed as two signals at 3.96 and 3.31 ppm. The result suggests that two protons of the methylene group are in different environment which is induced by the fused-chelate ring formation.
UNEQUIVOCAL SIGNAL ASSIGNMENT OF THE 13C NMR SPECTRUM OF 4-HOMOISOTWISTANE AS PROBED BY DEUTERIUM SUBSTITUTIONS
Authors: Fujikura Yoshiaki , Aigami Koji , Takaishi Naotake , Ikeda Hiroshi , Inamoto Yoshiaki
Published: July 2006

Isotope shifts as well as geminal and vicinal couplings with the deuterium atom were clearly observed in the 13C NMR spectrum of tricyclo[5.3.1.03,8]undecane-2-d1 (2 and 3) and -3-d1 (4). The phenomena made possible an unambiguous signal assignment in the spectrum of the undeuterated hydrocarbon (1) that had been impracticable so far.
CATIONIC PALLADIUM AND PLATINUM COMPLEXES OF BIDENTATE PHOSPHORUS YLIDE LIGANDS
Authors: Kato Masao , Urabe Hiroshi , Oosawa Yoshinao , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

Cationic complexes of bidentate phosphorus ylide ligands, benzoylmethylenediphenyl-2-diphenylphosphinoethylphosphorane(BDEP) and benzoylmethylenediphenyldiphenylphosphinomethylphosphorane (BDMP) [MCl(L)PR3]+BPh4− and neutral complexes MX2(L) (M = Pd or Pt ; L = BDEP or BDMP ; R = Ph or Cy ; X = Br, I, or SCN) have been synthesized and characterized.
REACTIONS OF SEVERAL NUCLEOPHILES WITH QUATERNARY SALTS OF NICOTINAMIDE
Authors: Minato Hiroshi , Yamazaki Eiji , Kobayashi Michio
Published: July 2006

Reactions between 1-benzyl-3-carbamoylpyridinium chloride(1) and several nucleophiles were investigated by use of 13C-NMR spectroscopy.The reaction with OH\ominus in EtOH–H2O yielded a trimer of the deprotonated 1, and the positions 4 and 6 were the ring-connecting sites. The MeO in MeOH removed a benzyl proton, and yielded an N-ylide. The meS\ominus in H2O added -at the position 4. The reaction with HgO and Et2NH resulted in the oxidation at the position 2, yielding a pyridone.
REACTIVITY PATTERN OF ARYL RADICALS TOWARD BENZENE AND NITROSODURENE. TRAPPING OF CYCLOHEXADIENYL RADICALS BY NITROSODURENE
Authors: Suehiro Tadashi , Kamimori Mariko , Tokumaru Katsumi , Yoshida Masayuki
Published: July 2006

Thermal decompositions of arylazotriphenylmethanes in benzene solution in the presence of nitrosodurene afforded either arylcyclohexadienyl duryl nitroxides or aryl duryl nitroxides depending upon whether the substituents on aryl radicals were electron withdrawing or electron donating. These results reflect the different reactivities of aryl radicals toward benzene nucleus.
NEW CROSS-ALDOL REACTION Via VINYLOXYBORANES
Authors: Mukaiyama Teruaki , Inoue Tan
Published: July 2006

A new synthesis of cross-aldols from two different carbonyl compounds by using di-n-butylboryl trifluoromethanesulfonate and tertiary amine is described. In the case of methyl ketones, the reaction takes place in regiospecific manner to afford the corresponding aldols in good yields.
BETAINE AS AN EFFECTIVE ACID CAPTOR: A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXAMIDES
Authors: Mukaiyama Teruaki , Aikawa Yukiko , Kobayashi Susumu
Published: July 2006

The equimolar reactions of carboxylic acids and amines with 1-methyl-2-fluoro or 2-chloropyridinium salt by the successive use of 1 mol of tri-n-butylamine and the betaine, (3,4-dihydro-2H-pyrido[1,2-a]pyrimidin-2-one (I)), afforded the corresponding carboxamides in good yields.
MOLECULAR ASYMMETRY INDUCED BY UNSATURATED ADDITIVES IN THE ENANTIOSELECTIVE DEHYDROGENATION OF RACEMIC 1-PHENYLETHANOL BY RuCl2(PPh3)3 AND (+)-NEOMENTHYLDIPHENYLPHOSPHINE
Authors: Ohkubo Katsutoshi , Hirata Keiichi , Yoshinaga Kohji
Published: July 2006

Several unsaturated additives enhanced the enantioselective ability of a catalytic system of RuCl2(PPh3)3 and (+)-neomenthyldiphenylphosphine in dehydrogenation of racemic 1-phenylethanol through the chirality induced by their coordination to the complex.
REDUCTION OF UNSATURATED CARBON–CARBON BONDS BY MEANS OF IRON CHLORIDE-SODIUM HYDRIDE SYSTEM
Authors: Fujisawa Tamotsu , Sugimoto Kikuo , Ohta Hiromichi
Published: July 2006

The reagent consisting of iron(II or III) chloride and sodium hydride in tetrahydrofuran was found to reduce both carbonyl and olefin bonds in an enone. Olefins and acetylenes were also hydrogenated by the reagent giving the corresponding saturated hydrocarbons under mild conditions.
REACTION OF PYRIDINIUM YLIDES WITH DIETHYL AZODICARBOXYLATE—A FACILE SYNTHESIS OF Δ2-1,3,4-OXADIAZOLINES—
Authors: Mukaiyama Teruaki , Atsumi Kunio , Takeda Takeshi
Published: July 2006

The pyridinium ylides, derived from 1-(2-oxoalkyl)pyridinium salts, reacted with diethyl azodicarboxylate to give Δ2-1,3,4-oxadiazolines, which isomerized to α-[N,N′-bis(ethoxycarbonyl)hydrazino]-α,β-unsaturated carbonyl compounds on treatment with acid such as trifluoromethanesulfonic acid.
SURFACE COMPOSITION OF THE SCALE ON Ni–Cu ALLOY FORMED IN NITRIC OXIDE
Authors: Takasu Yoshio , Matsuda Yoshiharu , Maru Shun-ichi , Yokota Setsuaki , Moronuki Yoshio
Published: July 2006

X-ray photoelectron spectroscopy(ESCA) and Auger electron spectroscopy(AES) were adopted for an examination of the surface composition of scale on Ni–Cu alloy(64%Ni) formed in nitric oxide at 700°C. The surface layer of the scale was mainly composed of NiO caused by preferential oxidation of nickel in the alloy by nitric oxide.
DIELECTRIC BEHAVIOR OF 1-PROPANOL IN A VARIETY OF HYDROGEN-BONDING SOLVENTS
Authors: Sato Hiroshi , Takahashi Hiroaki , Higasi Keniti
Published: July 2006

The dependence of the principal relaxation time of 1-propanol upon hydrogen-bonding solvent has been carefully studied by use of water and four ketones as solvent. It was found that the molecular weight of the hydrogen-bonding solvent is fairly important in the solvent effect.
THE SYNTHESIS OF SOLID SUPER ACIDS AND THE ACTIVITY FOR THE REACTIONS OF BUTANE AND ISOBUTANE
Authors: Tanabe Kozo , Hattori Hideshi
Published: July 2006

Solid super acids such as SbF5–TiO2–SiO2, SbF5–TiO2, and SbF5–SiO2–Al2O3 were synthesized, whose acid strengths were in the range of −13.16≥H0>−14.52. A SbF5–TiO2–SiO2 showed the highest activity for the reaction of butane at room temperature. A SbF5–TiO2 was highly selective for the skeletal isomerization of butane, where 72 % of the products was isobutane.
REACTION OF TETRASULFUR TETRANITRIDE (N4S4) WITH HYDRAZINES AND HYDRAZONES
Authors: Tashiro Masashi , Mataka Shuntaro
Published: July 2006

The reaction of N4S4 with benzoyl- (1a) and 1-methyl-1-phenylhydrazine (1b), benzophenone- (2a) and fluorenone hydrazone (2b) was carried out in refluxing benzene (1a and 1b) or toluene (2a and 2b) and N4S4 was found to behave as a N–N bond cleaving reagent for 1b, while both a N–N bond cleaving and an oxidizing reagent for 1a and 2. The reaction mechanism was briefly mentioned.
FORMATION OF DIPHENYL(9-PHENYL-10-ANTHRYL)METHYL, A POSTULATED INTERMEDIATE OF THE SIDE-CHAIN OXIDATION OF 9-BENZHYDRYL-10-PHENYLANTHRACENE, FROM 9,10-BNZHYDRYL-10-PHENYL-9,10-EPIDIOXYANTHRACENE IN LIQUID SULFUR DIOXIDE
Authors: Nojima Masatomo , Nagao Gensai , Tokura Niichiro
Published: July 2006

By dissolving 9,10-dihydro-9-benzhydryl-10-phenyl-9,10-epidioxyanthracene in liquid sulfur dioxide, diphenyl(9-phenyl-10-anthryl)methyl was obtained, which was conveniently oxidized to diphenyl(9-phenyl-10-anthryl)methyl cation by introducing oxygen into this solution , and after treatment with ethanol 9-ethoxy-9-phenyl-10-diphenylmethylene-9,10-dihydroanthracene was isolated.
NATURE OF THE EXCITED STATES OF 2-NAPHTHOL AND 1-ANTHROL HYDROGEN BONDED WITH PYRIDINE
Authors: Yamamoto Sada-aki , Kikuchi Koichi , Kokubun Hiroshi
Published: July 2006

The transient absorption spectra were observed for 2-naphthol and 1-anthrol in pyridine upon sensitization by suitable triplet energy donors. No transient was produced by direct excitation. The intersystem crossing process is not the deactivation pathway of the singlet excited species hydrogen bonded with pyridine.
THE REACTION OF TRICYCLO [6.2.0.03,6]DECA-1,3(6)4,7,9-PENTAENE WITH BENZOYL PEROXIDE AND AZOISOBUTYRONITRILE TO AFFORD A NEW QUINODIMETHANE, TRICYCLO [6.2.0.03,6]DECA-2,5,7,10-TETRANE
Authors: Toda Fumio , Tanaka Koichi , Yoshioka Takayuki
Published: July 2006

Benzoyl peroxide easily added to 2,7-di-tert-butyl-4,5,9,10-tetraphenyltricyclo[6.2.0.03,6 deca-1,3(6)4,7,9-pentaene (1a) and its tetrabromo derivative (1b), affording new quinodimethanes, 4,9-dibenzoyloxy-2,7-di-tert-butyl-4,5,9,10-tetraphenyltricyclo[6.2.0.03,6]deca-2,5,7,10-tetraene (2a) and its tetrabromo derivative (2b), respectively. Similarly the reactions of 1a and 1b with asoisobutyronitrile afforded 4,9-di(1-cyano-1-methylethyl)-analogs of 2a (3a) and 2b (3b), respectively.
HEPTAFLUORO-1-METHYLETHYL PHENYL KETONE—A NEW BENZOYLATING AGENT
Authors: Ishikawa Nobuo , Shin-ya Seiji
Published: July 2006

A mixture of heptafluoro-1-methylethyl phenyl ketone (1) and N,N,N′,N′-tetramethylethylenediamine was found to be a facile benzoylating agent, providing O-, N-, and C-benzoyl compounds. The characteristic reactivity of the heptafluoro-1-methylethyl ketone was compared with that of trifluoromethyl and pentafluoroethyl ketones.
A NEW REAGENT, Zn–ZnCl2-ROH, FOR THE HYDROGENATION OF CONJUGATED DOUBLE BOND
Authors: Toda Fomio , Iida Kunio
Published: July 2006

Not only the double bond placed between two carbonyl or cyano groups but also the double bonds of indenone and cyclopentadienone were easily hydrogenated by heating with Zn–ZnCl2-ROH.
REDUCTION BY A MODEL OF NAD(P)H. IX. ESR STUDY ON THE BIOMIMETIC REDUCTION OF BENZILS WITH 1-BENZYL-1,4-DIHYDRONICOTINAMIDE
Authors: Ohnishi Yutaka , Ohno Atsuyoshi
Published: July 2006

ESR studies on the biomimetic reduction of benzils by 1-benzyl-1,4-dihydronicotinamide indicate the formation of anion radicals of benzils. In the presence of magnesium perchlorate, the anion radicals are found to coordinate onto the metal ions.
A CONVENIENT METHOD FOR THE PREPARATION OF N-ACYL LACTAMS
Authors: Ishida Akihiko , Bando Takashi , Mukaiyama Teruaki
Published: July 2006

Various N-acyl lactams were prepared in good yields from free carboxylic acids and lactim ethers by employing 1-methyl-2-chloropyridinium iodide as a coupling reagent. Similarly, 1-acyl-3-methyl-4-imidazoline-2-thione or 3-acyl-2-thiazolidinethione was prepared in a fairly good yield from carboxylic acid, and 1-methyl-2-methylthioimidazole or 2-methylthio-2-thiazoline, respectively.
A NEW ROUTE TO ALKYLTROPILIDENES. UNAMBIGUOUS SYNTHESIS OF 3-ALKYL-2,4-DIMETHYLTROPILIDENES
Authors: Takeuchi Ken′ichi , Yasuda Kenji , Okamoto Kunio
Published: July 2006

1-Alkyl-2,7-dimethyl-2,6-cycloheptadienols (IV), easily prepared from 2,7-dimethyl-2,6-cycloheptadienone (III) and alkyllithiums, are dehydrated by boric acid to give the corresponding 3-alkyl-2,4-dimethyltropilidenes (II) in good yields. The route provides an unambiguous synthesis of II.
INTERMEDIATE OF THE HYDROGENATION OF BUTADIENE ON A MoS2 CATALYST
Authors: Okuhara Toshio , Kondo Toshihiko , Tanaka Ken-ichi
Published: July 2006

Adsorbed iso-butenyl (σ-allyl) is formed on MoS2 catalyst during the hydrogenation of butadiene, and is the intermeidate of hydrogen exchange reaction of butadiene as well as of the hydrogenation of butadiene. The σ-allyl species formed on the active sites do not isomerize to π-allyl form so that the reaction of butadiene with a mixture of H2 and D2 gives do-1-butene and d2-1-butene with few d1-1-butene, indicating high conservation of hydrogen molecular identity in the products.
A FACILE SYNTHESIS OF CARBOXYLIC THIOL ESTERS FROM CARBOXYLIC ACIDS AND THIOLS
Authors: Watanabe Yutaka , Shoda Shin-ichiro , Mukaiyama Teruaki
Published: July 2006

Various thiol esters are prepared in good yields by the reaction of thiols with acyloxypyridinium salts formed in situ from free carboxylic acids and 2-fluoro-1-methylpyridinium p-toluenesulfonate.
EFFECTS OF IMPURITIES ON THE IRRADIATION-INDUCED LATTICE DISTORTION IN YTTRIUM NIOBATE (YNbO4)
Authors: Kenjo Tadao , Yajima Seishi
Published: July 2006

When the YNbO4 compounds containing various impurities were exposed to the fast-neutron dose, they underwent lattice-distortion to be high-temperature values in the lattice parameters; their monoclinic lattice parameters changed to smaller values in the tetragonality(a/c) in the b plane and to greater values in sinft. The degree of the structural change increases with increasing value in the concentration of CaO subtracted by that of ZrO2 contained.
SPECTROPHOTOMETRIC DETERMINATION OF IRON(III) AND VANADIUM(V) BASED ON THE SOLUBILIZATION OF THEIR 8-QUINOLINATES BY SODIUM DODECYL SULFATE
Authors: Kodama Michiko , Tominaga Takehiko
Published: July 2006

8-Quinolinol complexes of iron(III) or vanadium(\={V}) are made water soluble in the presence of enough sodium dodecyl sulfate (SDS) to form the micelle and each of the solubilized complexes shows stable coloration for at least 2–3 days. This observation provided a basis for the simultaneous determination of microgram quantities of iron(III) and vanadium(\={V}) without either solvent extraction or masking agents.
UNUSUALLY STRONG BASIC SITES AS ACTIVE SITES FOR CIS–TRANS INTERCONVERSION OF 2-BUTENE ON CaO
Authors: Iizuka Tokio , Endo Yusuke , Hattori Hideshi , Tanabe Kozo
Published: July 2006

A good correlation was found between the amount of NO22− formed by adsorption of NO on CaO and the rate of cis–trans interconversion of 2-butene. The cis–trans isomerization which occurred very rapidly over CaO evacuated at 700–900°C was inhibited by adsorption of NO, whereas the double bond isomerization was not. Active sites for the cis–trans interconversion was ascribed to unusually strong basic sites.
STRUCTURE OF AQUOBISCYCLO(l-HISTIDYL-l-HISTIDYL)DICOPPER(II) PERCHLORATE COMPLEX
Authors: Kojima Yoshitane , Hirotsu Ken , Matsumoto Keiji
Published: July 2006

The crystal structure of the title complex, [H2O Cu2(C12H13N6O2)2](ClO4)2·3.5H2O, was determined from X-ray diffraction data. The unit cell contains two independent complex cations which have similar structures. The complex cation consists of a dimer in which one Cu atom is pseudo tetrahedral and the other one distorted square pyramidal.
PREPARATION OF CARBODIIMIDES FROM THIOUREAS USING ORGANOLITHIUM OR ORGANOMAGNESIUM COMPOUND
Authors: Sakai Shizuyoshi , Fujinami Tatsuo , Otani Noboru , Aizawa Toshiyuki
Published: July 2006

Thermal decomposition of N,N’-dilithio- or bis(bromomagnesio)thioureas, prepared in situ from the thioureas substituted by bulky groups and butyllithium or bromoethylmagnesium, at 170–200°C under vacuum afforded dialkyl- or diaryl-carbodiimides in 33–61% yields. However, the decomposition of N,N’-dilithiothioureas was accelerated by the addition of carbon disulfide, and the carbodiimides were formed below room temperature in 67–87% yields.
PHOSPHINYL- AND PHOSPHINOTHIOYLAMINO ACIDS AND PEPTIDES. I. PREPARATION OF DIPHENYLPHOSPHINOTHIOYL(Ppt)-AMINO ACIDS
Authors: Ueki Masaaki , Ikeda Shigeru
Published: July 2006

Diphenylphosphinothioyl(Ppt)-amino acids were prepared under the Schotten-Baumann conditions by use of diphenylphosphinothioyl chloride (Ppt–Cl). Ppt group is cleaved about 4 times faster than t-butyloxycarbonyl group. Ppt causes no steric hindrance and no racemization.
ESR STUDY OF VANADYL CHELATES IN CARBONACEOUS MESOPHASE
Authors: Yamada Yoshio , Sohma Junkichi , Ouchi Koji , Sanada Yuzo
Published: July 2006

Behavior and arrangement of Gachsaran residue in the magnetic field during the carbonization process were investigated through the ESR spectra from spin-probes of the vanadyl porphyrin chelates. The results show that some of the chelates are incorporated into formed mesophase and that the molecular plane is oriented parallel to the field.
REACTIONS OF 2,2-DIMETHYL-1-(P-TOLUENESULFONYLIMINO)THIOCHROMAN WITH NUCLEOPHILES SUCH AS THIOLS, AMINES, AND GRIGNARD REAGENTS
Authors: Murase Masao , Kitano Masahiko , Kise Masahiro , Murai Hiromu
Published: July 2006

The reactions of 2,2-dimethyl-1-(p-toluenesulfonylimino)thiochroman (1) with nucleophiles such as thiols, amines, and Grignard reagents give the sulfenic acid derivatives. The mechanisms of these reactions are discussed.
CATALYTIC FIXATION OF CARBON DIOXIDE TO FORMIC ACID BY TRANSITION-METAL COMPLEXES UNDER MILD CONDITIONS
Authors: Inoue Yoshio , Izumida Hitoshi , Sasaki Yoshiyuki , Hashimoto Harukichi
Published: July 2006

Formic acid was catalytically synthesized from carbon dioxide and hydrogen by a combination of group VIII transition-metal complexes and bases in the presence of water far less than the equivalent amount of the catalyst.
ORGANO-MODIFIED METAL OXIDE ELECTRODE. I. STUDIES OF MODIFIED LAYER BY CAPACITANCE MEASUREMENTS AND ESCA
Authors: Fujihira Masamichi , Matsue Tomokazu , Osa Tetsuo
Published: July 2006

The successive chemical modifications of silanized tin oxide electrodes to the more complicated compounds have been investigated. ESCA and electrochemical techniques were employed for characterization of the organo-modified surfaces. Understanding of the semiconductor electrode-solution interfaces has been greatly advanced by the capacitance measurements of the modified electrodes.
THERMAL ADDITION REACTION OF CYCLOHEPTATRIENE WITH 1,4-NAPHTHOQUINONE: AN EXPERIMENTAL EVIDENCE ON THE MECHANISM OF vic-DITROPYLATION TO QUINONES
Authors: Takeshita Hitoshi , Mametsuka Hiroaki , Mori Akira
Published: July 2006

Thermal reaction of cycloheptatriene with 1,4-naphthoquinone produced 2-(7-tropyl)-2,3-dihydro-1,4-naphthoquinone and a dimeric 2:2-adduct in addition to the similar types of adducts with some p-benzoquinones. An experimental support for the previously suggested mechanism on the vic-ditropylation process was obtained by a further conversion of isolated intermediates.
NEW METAL HALIDE CATALYSTS FOR REDUCTION OP NITRIC OXIDE WITH AMMONIA
Authors: Todo Naoyuki , Nishijima Akio , Ueno Akifumi , Kurita Minoru , Hagiwara Hiroyuki , Sato Toshio , Kiyozumi Yoshimichi
Published: July 2006

The effect of counter anions on the catalytic activities of cupric and ferric ions, when salts of them are used as catalysts for the reduction of nitric oxide with ammonia, was investigated. The order of the co-catalyst activity of the counter anions investigated is Br−, Cl−, SO42−, and O2−.
THERMAL DECOMPOSITION OF VINYL AZIDES IN ACRYLIC ACID DERIVATIVES: SYNTHESIS OF 1-VINYLAZIRIDINES
Authors: Nomura Yujiro , Hatanaka Naoto , Takeuchi Yoshito
Published: July 2006

By the thermal decomposition of α- or β-azidostyrene and 2-azido-trans-2-butene in acrylonitrile or methyl acrylate were obtained 2-substituted 1-(1-phenylvinyl)aziridine, 1-trans-styrylaziridine, and 1-(1-methyl-cis-propenyl)aziridine, respectively, in good yields.
PHOTOCHEMICAL REACTION OF BIS-HALOGENODINITROSYLCOBALT(-I) WITH HEXACARBOMLCHROMIUM(O)
Authors: Schmidt Jörn , Rehder Dieter
Published: July 2006

Photo-induced ligand exchange between [Co(NO)2X]2 (X = Cl, Br, I) and [Cr(CO)6] dissolved in THF yields solutions which contain –according to e.s.r. spectra– [Cr(NO)X2(THF)n] species. Spin densities, coupling constants, and g values are discussed in the light of varying Cr/X interaction. E.s.r. measurements of the frozen solutions lead to the assumption that g values are anisotropic.
CARRIER PHOTOGENERATION INVOLVING TRIPLET–TRIPLET ANNIHILATION IN N-VINYLCARBAZOLE–1-VINYLNAPHTHALENE COPOLYMER
Authors: Yokoyama Masaaki , Hanabata Makoto , Tamamura Toshiaki , Nakano Takeshi , Mikawa Hiroshi
Published: July 2006

The carrier photogeneration mechanism has been investigated in N-vinylcarbazole(VCz)-1-vinylnaphthalene(VNa) copolymer. The photocurrent as well as the delayed fluorescence of carbazole chromophore due to the triplet–triplet (T–T) annihilation are found to be enhanced by introducing a few mole per cent of VNa units. The photocurrent shows a quadratic dependence upon the illumination light intensity in a high field. In the light of the emission study, the following carrier photogeneration involving T–T annihilation is found to occur in the VCz–VNa copolymer: (Remark: Graphics omitted.)Here, Cz and Na represent the carbazole and naphthalene chromophores, and the asterisk and double asterisk indicate the lowest and higher excited states, respectively.
THE REGIOSPECIFIC SYNTHESIS OF VICINALLY DIALKYLATED CYCLOPENTADIENES AND ITS APPLICATION TO A SYNTHESIS OF ALLETHROLONE
Authors: Fujisawa Tamotsu , Ohta Hiromichi , Kobori Takeo , Hata Kazumi , Sakai Kunikazu
Published: July 2006

A method for the selective introduction of two alkyl groups into the vicinal positions of cyclopentadiene was investigated by treating esters of cyclopentadienylethanols, prepared from sodium cyclopentadienide and epoxide, with a base, followed by reduction with lithium aluminum hydride. 2-(2-Methylcyclopentadienyl)ethanol thus obtained was transformed to allethrolone via several steps.
HIGH PERFORMANCE LIQUID CHROMATOGRAPHY OF COBALT(III) MIXED LIGAND COMPLEXES WITH ACETYLACETONATE AND OXINATE AND MONOMETHYLOXINATE IONS
Authors: Kidani Yoshinori , Naga Shinobu , Koike Hisashi
Published: July 2006

In the presence of Co(III) mixed ligand complexes with acetylacetonate, and oxinate and monomethyloxinate ions, the authors attempted to employ high performance liquid chromatography, HPLC, for the separation and purification of the mixed ligand complexes and the reverse phase mode was found to be appropriate. Optimal reaction conditions of the synthesis have been studied.
KINETIC STUDY ON THE FORMATION OF A BINUCLEAR COMPLEX BETWEEN COPPER(II) AND CYCLODEXTRIN
Authors: Mochida Kazuo , Matsui Yoshihisa
Published: July 2006

The formation of a 2:1 complex between copper(II) and α- or β-cyclodextrin was examined in an alkaline solution by means of a stopped-flow spectrophotometer. The reaction involves a first-order rate process corresponding to the cross-linking of a cyclodextrin ring by a Cu(OH−)2Cu or Cu(OH−)(O2−)Cu ion bridge.
A PMR STUDY ON THE FIXED CONFORMATION OF FUNCTIONALIZED (2,5)PYRIDINOPHANES
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi , Emoto Sakae
Published: July 2006

The relationship of the hindered rotation with the ring size in phane derivatives of pyridoxine and pyridoxal was investigated with the aid of the appearance of an AB quartet signal in PMR spectra at ambient or elevated temperature, and it was found that phane derivatives with the ring size equal to or less than fourteen members could be optically resolved into enantiomers.
DONOR–ACCEPTOR TYPE CYCLOADDITION OF DISPIRO[2.2.2.2]DECA-4,9-DIENE WITH TETRACYANOQUINODIMETHANE
Authors: Tsuji Takashi , Hienuki Yutaka , Nishida Shinya
Published: July 2006

Dispiro[2.2.2.2]deca-4,9-diene undergoes the cycloaddition with tetracyanoquinodimethane to give [3.3] paracyclophane derivative via a zwitterionic intermediate which can be trapped by polar multiple bonds.
HIGH TEMPERATURE OXIDATION OF COPPER IN NITROGEN OXIDE OBEYING A LINEAR LAW
Authors: Takasu Yoshio , Takagi Morio , Matsuda Yoshiharu
Published: July 2006

The oxidation of copper in nitrogen oxide(700–820°C, 3.5–14 Torr) has been found not only to obey a linear oxidation law, but also to be a first order reaction. The apparent activation energy was 113 KJ/mol. According to the x-ray diffractometry, x-ray photoelectron spectroscopy and ion microanalysis, only Cu2O was found in the oxide layers. The rate determining step was a reaction between nitrogen oxide and the surface of Cu2O and it was shown by an equation: 2NO→N2+2·O2− + 4·⊕.
SYNTHESES OF POTENT MUTAGENS IN TRYPTOPHAN PYROLYSATES
Authors: Akimoto Hiroshi , Kawai Akiyoshi , Nomura Hiroaki , Nagao Minako , Kawachi Takashi , Sugimura Takashi
Published: July 2006

The mutagenic γ-carbolines, 3-amino-1-methyl-5H-pyrido[4,3-b]indole (IV) and 3-amino-1,4-dimethyl-5H-pyrido[4,3-b]indole (XIII) have been synthesized by condensation of 3-acetylindole-2-acetonitrile (III) with ammonia and by thermal decomposition of 2-amino-3,6-dimethyl-4-(1-benzotriazolyl)pyridine (XII), respectively. Synthesis of IV has been achieved by an alternative route involving acid catalyzed cyclization of α-acetamido-β-(2-indole)propionic acid (V), followed by dehydrogenation and Curtius rearrangement.
INFRARED STUDY OF CHEMISORBED AMMONIA ON AN EVAPORATED IRON FILM
Authors: Okawa Tadashi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

The infrared absorption at 500 cm−1 was observed during the course of ammonia decomposition on an evaporated iron film. It was assigned to an iron-nitrogen stretching vibration of surface nitrogen species which may be described as Fe–NHX. The assignment was confirmed by the exchange reaction with 15N labeled ammonia.
ELECTROCHEMICAL GENERATION OF CARBALKOXYNITRENES FROM N,N-DICHLORO CARBAMATES
Authors: Fuchigami Toshio , Nonaka Tsutomu
Published: July 2006

Carbalkoxynitrenes (II) can be generated from N,N-dichloro carbamates (methyl, ethyl) (I) by electrolysis, as shown by the formation of 2-(carbalkoxyamino)-1,4-dioxane (III) in the electroreduction of (I) in the presence of dioxane.
APPLICATION OF 2-TRIFLUOROMETHANESULFONYLOXYPYRIDINE IN TRIFLUOROACETIC ACID TO ACYLATION OF AROMATICS
Authors: Keumi Takashi , Saga Hiroshi , Taniguchi Rikio , Kitajima Hidehiko
Published: July 2006

New method for synthesis of aromatic ketones was investigated. 2-Trifluoromethanesulfonyloxypyridine (TSP) in trifluoroacetic acid was very useful in the condensation of carboxylic acids with some aromatic compounds to give aromatic ketones. The reaction of arenes with benzoic acid in the presence of TSP in trifluoroacetic acid gave benzoylarenes. By the same method, 2-acylfluorenes were obtained from carboxylic acids and fluorene.
CLEAVAGE OF ARALKYL– AND ARYL–OXYGEN AND –NITROGEN BONDS BY THE HYDROGEN TRANSFER FROM ORGANIC COMPOUNDS CATALYZED BY NOBLE METAL SALTS
Authors: Nishiguchi Takeshi , Imai Hideaki , Fukuzumi Kazuo
Published: July 2006

Aralkyl– and aryl–oxygen bonds of ethers, esters, and alcohols, and aralkyl– and aryl–nitrogen bonds of amines, an imide and an amide were hydrogenolyzed by the hydrogen transfer from organic compounds such as indoline in the presence of some noble metal salts. In these reactions, not only benzyl group but phenethyl and phenyl group were removed.
CARBON-13 NMR STUDY OF AN INTERMEDIATE COMPLEX IN HYDROESTERIFICATION OF OLEFINS
Authors: Shin Shigemitsu , Matsuda Akio , Nakayama Jun-ichi , Bando Ken-ichiro
Published: July 2006

Reaction of a new hydroesterification catalyst H2Co3Py5(CO)9 with 2-vinylpyridine yielded an alkylcobalt complex (Remark: Graphics omitted.), which is considered to be an intermediate complex in the hydroesterification of 2-vinylpyridine. The 13C-NMR parameters of the α- and β-methylene groups were δ=60.0 ppm (JC-H=147 Hz) and 37.4 ppm (132 Hz), respectively.