bluuebunny/crossref_metadata_2025 huggingface dataset:
Cu(II) ION TRANSFER FROM PEPTIDES TO CYSTEINE. FORMATION OF THE TERNARY COMPLEX, (CYSTEINE)-Cu(II)-(PEPTIDE), AS AN INTERMEDIATE
Authors: Hanaki Akira
Published: July 2006

The transfer of Cu(II) ion from glycine peptides to cysteine was studied by a stopped-flow spectrophotometric method. The first reaction is the ligand substitution of Cu(II)-peptide, Cu(H−2peptide)−, by cysteine forming the ternary complex, (cysteine)Cu(H−1peptide)2−. The subsequent reaction is the nucleophilic attack of cysteine upon the ternary complex producing Cu(II)-biscysteinate. The rate of those reactions depends on the steric factors around the metal site.
SUBSTRATE ENTRAPMENT AND FORMATION OF pH GRADIENT IN AMMONIUM BILAYER VESICLES
Authors: Kunitake Toyoki , Okahata Yoshio , Yasunami Shoichiro
Published: July 2006

Trapping of water-soluble amines in the inner water core of ammonium bilayer vesicles was determined by reaction with fluorescamine, and the formation of pH gradient was confirmed by fluorescence quenching of membrane-bound riboflavin.
UNUSUAL PHOTOCHEMICAL REDUCTION AND DEACYLATION OF NAPHTHYL KETONES INCORPORATED IN A TRIPTYCENE SKELETON
Authors: Iwamura Michiko , Asano Tadahiko , Tanaka Yoshio , Iwamura Hiizu
Published: July 2006

In contrast with the photochemical inertness of acetonaphthones, irradiation of the 5-acetyl, propionyl, butyryl, and decanoyl derivatives of 7,12-dihydro-7,12-(o-benzeno)benz[a]anthracene in methanol gave the corresponding reduction products and the deacylation product in efficiency of 0.02–0.05.
SOLVENT EFFECT IN THE REACTION OF (S)-N-ISOPROPYL-(Nα-BENZYLOXY CARBONYL)PROLINAMIDE WITH LITHIUM ALUMINUM HYDRIDE
Authors: Kiyooka Syun-ichi , Goto Fumitaka , Suzuki Kojiro
Published: July 2006

A specific solvent effect in the reduction of (S)-N-isopropyl-(Nα-benzyloxycarbonyl)prolinamide with lithium aluminum hydride. The reactions in diethyl ether gave mainly (S)-N-isopropyl-(Nα-methyl)prolinamide and (2S)-N-methyl-2-[(isopropylamino)methyl]pyrrolidine, while 3-isopropyl-2-oxo-1,3-diazabicyclo[3.3.0]oct-4-ene and (5S)-3-isopropyl-l,3-diazabicyclo [3.3.0]octane were produced in tetrahydrofuran.
PHOTOSENSITIZED ELECTRON TRANSPORT IN THE ASYMMETRICAL VESICLES INCORPORATING A SURFACE-ACTIVE ZINC PORPHYRIN AND AN ELECTRON MEDIATOR
Authors: Katagi Toshiyuki , Yamamura Takeshi , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

Photosensitized electron transport from ethylenediaminetetraacetic acid disodium salt (EDTA·2Na) or sodium ascorbate (Asc·Na) to methylviologen (MV++) across vesicle membranes of dipalmitoyl-l-α-phosphatidylcholine (DPPC) which incorporate 5,10,15-tris(1-methylpyridinium-4-yl)-20-[4-(octadecyloxy)phenyl]porphinatozinc(II) trichloride (Zn–P) asymmetrically (only on the outer side of the membrane) is facilitated by an electron mediator such as ubiquinone Q10 (UQ10) or tetraphenylporphine (TPP). Zn–P plays an important role in the redox reaction at the interface of the vesicles and the efficiency can be correlated with the redox potentials of the mediators.
A NOVEL METHOD FOR THE SYNTHESIS OF 2,2,2-TRIBROMOETHANOLS FROM ALDEHYDES AND CARBONTETRABROMIDE IN THE PRESENCE OF STANNOUS FLUORIDE —A SYNTHESIS OF DIACETYL-d-ERYTHRONOLACTONE—
Authors: Mukaiyama Teruaki , Yamaguchi Masahiko , Kato Jun-ichi
Published: July 2006

In the presence of stannous fluoride, 2,2,2-tribromoethanols are conveniently prepared from aldehydes and carbontetrabromide under a mild reaction condition. The reaction is efficiently applied to the synthesis of 2,3-diacetyl-d-erythronolactone starting from 2,3-O-isopropylidene-d-glyceraldehyde.
COPPER(I) IODIDE-FACILITATED NUCLEOPHILIC SUBSTITUTIONS OF NONACTIVATED ARYL IODIDES WITH ARENESELENOLATES
Authors: Suzuki Hitomi , Abe Hisako , Osuka Atsuhiro
Published: July 2006

Nonactivated aryl iodides readily react with areneselenolates, in the presence of copper(I) iodide, in hexamethylphosphoric triamide to produce the corresponding diaryl selenides in good yields.
THALLIUM (III) TRIFLUOROACETATE OXIDATION OF SOME ESTERS HAVING TWO C6–C3 UNITS
Authors: Nishiyama Shigeru , Yamamura Shosuke
Published: July 2006

Some esters with two C6–C3 units have been oxidized with thallium (III) trifluoroacetate to afford the corresponding lactones of medium-sized rings, one of which is an 11-membered ring lactone, an 8,8′-secosteganacin-type compound.
2-ACYLCYCLOBUTANONES FROM α-CYCLOPROPYLlDENE KETONES
Authors: Huet François , Lechevallier André , Conia Jean-Marie
Published: July 2006

Oxaspiropentyl ketones and acetals prepared from α-cyclopropylidene ketones and acetals undergo, with lithium halides, isomerisation to 2-acylcyclobutanones and monoacetals.
FORMATION OF UNUSUAL PYRROLES BY PHOTOLYSIS OF 1-VINYL-4,5-DIHYDRO-1H-1,2,3-TRIAZOLES
Authors: Ito Masato M , Nomura Yujiro , Takeuchi Yoshito , Tomoda Shuji
Published: July 2006

Photolysis of 4-alkyl-5-amino-1-vinyl-4,5-dihydro-1H-1,2,3-triazoles gave not 3-alkylpyrroles but unexpected 2-alkylpyrroles in 80–83 % yields. Similarly 4,4-dimethyltriazole derivatives gave 2,2-dimethyl-2H-pyrroles in 70–74 % yields. 1-Vinylaziridines were assumed as a possible intermediate of this anomalous reaction.
AN EFFICIENT SYNTHESIS OF HOMOALLYL ALCOHOLS BY THE REACTION OF ALLYL HALIDES WITH CARBONYL COMPOUNDS IN THE PRESENCE OF METALLIC TIN
Authors: Mukaiyama Teruaki , Harada Taira
Published: July 2006

In the presence of metallic tin, allyl halides were found to react smoothly with carbonyl compounds under mild conditions to give the corresponding homoallyl alcohols in good yields.
DIELS–ALDER REACTIONS OF 1,2,3,6-TETRAHYDROBENZOCYCLOBUTENE-3,6-DIONES. A NEW SYNTHESIS OF [4.4.2]PROPELLANES AND A DIVERGENCE OF SITESELECTIVITY CONTROLLED BY STERIC HINDRANCE
Authors: Oda Masaji , Kanao Yoshinori
Published: July 2006

1,2,3,6-Tetrahydrobenzocyclobutene-3,6-diones underwent Diels–Alder reactions most preferably at the internal double bond giving [4.4.2]propellanes unless steric hindrance is not significant. The adducts with cyclic 1,3-dienes were transformed photochemically to novel strained cage molecules.
ONE-POT PHOTOCHEMICAL SYNTHESIS OF NAPHTHO[1,2-g]QUINOLINE-7,12-DIONE DERIVATIVES — A NEW ROUTE TO AZA-ANALOGUE OF BENZ[a]ANTHRACENE-7,12-DIONES
Authors: Maruyama Kazuhiro , Tai Seiji , Otsuki Tetsuo
Published: July 2006

Substituted naphtho[l,2-g]quinoline-7,12-diones were synthesized regioselectively by one-pot photochemical reaction of 7-bromo-6-methoxyquinoline-5,8-dione with 1,1-diarylethylenes.
PRONOUNCED CATALYTIC ACTIVITY AND SELECTIVITY OF HIGH-TEMPERATURE EVACUATED ALUMINIUM PHOSPHATE FOR THE ISOMERIZATION OF n-BUTENES
Authors: Itoh Hidenobu , Tada Akio , Tanabe Kozo
Published: July 2006

Aluminium phosphate evacuated at 750 °C catalyzed only the cis–trans isomerization of cis-2-butene without double bond migration, but that evacuated at 1000 °C catalyzed the double bond migration of 1-butene with cis–trans isomerization. The activity of aluminium phosphate evacuated at 750 °C for the cis–trans isomerization was at least 10 times higher than that of silica-alumina.
SYNTHESIS OF 4-AZULENEETHANAMINE DERIVATIVES FROM SODIUM GUAIAZULENIDE AND METHYLENEIMINIUM SALT
Authors: Kurokawa Shinji
Published: July 2006

Alkyl- and aryl-substituted 4-azuleneethanamines, non-benzenoid analogs of biological active amines, were synthesized by the reaction of sodium guaiazulenide with methyleneiminium salt. These compounds were characterized by spectral data.
ACTIVATION OF POLYHALOALKANES BY PALLADIUM CATALYST. PREPARATION OF γ-TRICHLORO KETONES BY THE PALLADIUM CATALYZED ADDITION REACTION OF BROMOTRICHLOROMETHANE AND CARBON TETRACHLORIDE TO ALLYL ALCOHOLS
Authors: Nagashima Hideo , Sato Koji , Tsuji Jiro
Published: July 2006

The palladium catalyzed reaction of BrCCl3 and CCl4 with allyl alcohols with terminal double bonds afforded γ-trichloro ketones. Pd(OAc)2combined with tri-o-tolylphosphine in the presence of a base gave the best results.
INFRARED SPECTRUM AND VIBRATION-ROTATION ANALYSIS OF THE ν1 BAND OF METHYL-d3 IODIDE
Authors: Matsuura Hiroatsu , Murata Hiromu
Published: July 2006

Infrared spectrum of the ν1 band of methyl-d3 iodide was measured by a Fourier transform spectrometer with a resolution of 0.08 cm−1. The analysis of the spectrum gave the following constants: (ν0)1 2155.437±0.006 cm−1, α1A 0.02221±0.00006 cm−1, and α1B 0.000113±0.000002 cm−1. The centrifugal distortion constants were also determined.
THE BF3-CATALYZED DECOMPOSITION OF DIAZO CARBONYL COMPOUNDS IN NITRILES. FORMATION OF ENAMIDES
Authors: Ibata Toshikazu , Yamamoto Masahiko
Published: July 2006

The BF3-catalyzed decomposition of α-diazoacetopheones in acetonitrile, propionitrile, or methyl thiocyanate in the presence of 1,3,5-trimethoxybenzene produced enamides (7) in good yield.
SELECTIVE THERMAL OXIDATION OF OLIGOOXYETHYLENE RESINS DERIVED FROM CHLOROMETHYLATED CROSS-LINKED POLYSTYRENE
Authors: Yanagida Shozo , Fujita Hiroshi , Okahara Mitsuo
Published: July 2006

Solid-state oligooxyethylene resins derived from chloromethylated cross-linked polystyrene are oxidized thermally but selectively at the benzyl carbons bound to oligooxyethylenes, giving the resins with oligooxyethylene chains and carboxylic groups (0.1–2.5 mequiv COOH/g-resin).
LUMINESCENCES BY ELECTRON IMPACT AND FRAGMENTATIONS OF PYRIDAZINE, PYRAZOLE, 2-PYRAZOLINE, HYDRAZINE, AND 1,1-DIMETHYLHYDRAZINE
Authors: Inoue Akinori , Yoshida Shuji , Ebara Nozomu
Published: July 2006

Fragmentations of pyridazine, pyrazole, 2-pyrazoline, hydrazine, and 1,1-dimethylhydrazine were studied by means of electron-impact luminescence. Emissions of CN and NH radicals were observed, while emission of molecular nitrogen was absent. It was concluded that the cleavage of N–N bond is important in the fragmentation of these molecules.
THE SYNTHESES OF N-FREE α-DEHYDROAMINO ACID ESTER AND N-ACETYL DEHYDRODIPEPTIDE ESTER FROM N-CARBOXY α-DEHYDROAMINO ACID ANHYDRIDE
Authors: Shin Chung-gi , Yonezawa Yasuchika , Yoshimura Juji
Published: July 2006

N-Carboxy α-dehydroamino acid anhydride, derived from N-benzyloxycarbonyl α-dehydroamino acid (DHA) and thionyl chloride, was found to be very useful for the synthesis of N-free DHA ester by alcoholysis and N-acetyl dehydrodipeptide ester by coupling was α-amino acid ester.
HIGHLY ENANTIOSELECTIVE MICHAEL ADDITION OF THIOLS TO 2-CYCLOHEXENONE BY USING (2S,4S)-2-(ANILINOMETHYL)-1-ETHYL-4-HYDROXYPYRRQLIPINE AS A CHIRAL CATALYST
Authors: Mukaiyama Teruaki , Ikegawa Akihiko , Suzuki Keisuke
Published: July 2006

Optically active 3-arylthiocyclohexanones are produced in good optical yields by treating 2-cyclohexenone with aryl thiols in the presence of (2S,4S)-2-(anilinomethyl)-1-ethyl-4-hydroxypyrrolidine as a chiral catalyst.
EMBEDDED NICKEL CATALYST IN POLYMER
Authors: Tai Akira , Imachi Yoshimi , Harada Tadao , Izumi Yoshiharu
Published: July 2006

A new type embedded heterogeneous catalyst having high durability was prepared. The catalyst prepared by embedding Raney nickel catalyst modified with a mixture of NaBr and tartaric acid (TA-NaBr-MRNi) in room temperature vulcanizing silicone rubber (RTV-sillicone rubber) held its initial enantioface-differentiating ability and hydrogenation activity even after 30 times of its usage.
PERFLUOROALKYLATION OF AROMATIC COMPOUNDS WITH RfI(Ph)OSO2CF3
Authors: Umemoto Teruo , Kuriu Yuriko , Shuyama Hideo
Published: July 2006

Perfluoroalkylation of various aromatic compounds with perfluoroalkylphenyliodonium trifluoromethanesulfonate (FITS) under mild conditions was described. The reactivity of other perfluoroalkyliodonium salts was also examined.
AGGREGATE FORMATION OF TRIS(1,10-PHENANTHROLINE)IRON(II) IONS WITH IONIC SURFACTANTS. KINETIC STUDIES OF RACEMIZATION AND DISSOCIATION OF THE COMPLEX
Authors: Tachiyashiki Satoshi , Yamatera Hideo
Published: July 2006

Kinetic studies of the racemization and dissociation of [Fe(phen)3]2+ in the presence of sodium alkanesulfonates (CnH2n+1SO3Na, n=10, 14) showed the formation of at least two kinds of aggregates of the complex ion with alkanesulfonate ions (1:1 and 1:8 for n=10, and 1:1 and 1:3 for n=14).
A CONVENIENT TRIFLUOROMETHYLATION OF AROMATIC HALIDES WITH SODIUM TRIFLUOROACETATE
Authors: Matsui Kiyohide , Tobita Etsuko , Ando Midori , Kondo Kiyosi
Published: July 2006

Regiospecific trifluoromethylation by substitution of the halogen in aromatic halides was achieved by the use of sodium trifluoroacetate and copper(I) iodide. The reaction proceeded smoothly in dipolar aprotic solvents in good to high yields.
THE STRUCTURAL STUDIES OF HERQUEINONE AND ITS DERIVATIVES.THE ABSOLUTE CONFIGURATION OF DIHYDROHERQUEINONE MONOMETHYL ETHER
Authors: Yoshioka Takamitsu , Hirata Toshifumi , Aoki Tadashi , Suga Takayuki
Published: July 2006

The absolute configurations at C-3 and C-4 of dihydroherqueinone monomethyl ether were determined to be R and S, respectively, by the X-ray crystallography, with relation to the previously established 2′R-configuration of herqueinone. Also, the recently proposed configuration at C-4 of herqueinone was confirmed by relating it to dihydroherqueinone monomethyl ether.
SYNTHESIS OF FUNCTIONALIZED DIAZA(2,5)PYRIDINOPHANES
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi
Published: July 2006

A general synthetic method of N2,N(n+3)-di-p-toluenesulfonyl-(n+9)-hydroxy-(n+10)-hydroxymethyl-(n+9),(n+10)′-O-isopropylidene-2,(n+3)-diaza[m](2,5)pyridinophanes [n=5,6,7,8,9,10; m=n+4] was established by the reaction of 5′-deoxy-2′,5′-dichloro-3,4′-O-isopropylidenepyridoxine hydrochloride with N,N′-di-p-toluenesulfonyl-α,ω-alkanediamine disodium salt in N,N-dimethylformamide at 70–90 °C in fairly good yield depending on the chain length.
POLYMORPHISM OF THE CRYSTALLINE 1,1,1-TRICHLORO-2,2,2-TRIFLUOROETHANE. A NEW PLASTIC CRYSTAL
Authors: Tsukamoto Tamio , Nakamura Nobuo , Chihara Hideaki
Published: July 2006

DTA and Raman spectra showed that slowly cooled CF3CCl3 has two transitions from a metastable to the intermediate phase (112 K) and then to the plastic phase (145 K) on heating. The stable low temperature phase obtained by quenching the plastic phase has the transition at 140 K instead of 112 K.
REACTIONS OF PHENYLYTTERBIUM σ COMPLEX WITH CARBONYL COMPOUNDS: A NEW GRIGNARD-TYPE REAGENT HAVING UNUSUAL REACTIVITY TOWARD ESTERS AND KETONES
Authors: Fukagawa Toshihiro , Fujiwara Yuzo , Yokoo Kazuhiro , Taniguchi Hiroshi
Published: July 2006

Phenylytterbium iodide has been found to react with ketones, aldehydes, esters, and nitriles to give alcohols and/or ketones. The reactions with esters at low temperature give ketones as main products, and the reactivity of esters to Ph–Yb–I is higher than that of ketones in contrast to the Grignard reaction.
PENTAKISDEHYDRO[16]ANNULENO[18]ANNULENE
Authors: Nakatsuji Shin’ ichi , Akiyama Shuzo , Iyoda Masahiko , Nakagawa Masazumi
Published: July 2006

Pentakisdehydro[16]annuleno[18]annulene consisting of a trisdehydro[16]annulene and a trisdehydro[18]annulene has been synthesized. The 1H NMR spectrum indicates the paratropicity of 16- and diatropicity of 18-membered ring, respectively. The trisdehydro[18]annulene moiety is conformationally mobile and the 1H NMR behavior is described.
STRUCTURE OF SHINJULACTONE B, A NEW BITTER PRINCIPLE FROM AILANTHUS ALTISSIMA
Authors: Furuno Tetsuo , Naora Hirokazu , Murae Tatsushi , Hirota Hiroshi , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi , Matsushita Kazuhiro
Published: July 2006

A new bitter principle, shinjulactone B was isolated from the stem bark of Ailanthus altissima SWINGLE and the structure was established.
EFFECTS OF TEMPERATURE AND DISPERSANT ON PHOTOIRRADIATION OF p-FORMYLCINNAMIC ACID CRYSTAL
Authors: Hasegawa Masaki , Katsuki Hirokazu , Iida Yuji
Published: July 2006

p-Formylcinnamic acid (p-FCA) crystal dimerizes quantitatively via the crystal lattice controlled photochemical process to form 4,4′-diformyl-β-truxinic acid (p-FCA dimer). The crystalline dimer was obtained quantitatively on photoirradiation of p-FCA crystal below 35°C in aqueous dispersant and included one mole of crystal water (p-FCA dimer· H2O). In non-aqueous dispersant, the dimer was produced quantitatively below about 55°C; the amorphous dimer was produced in the range of about 55°C to 0°C, and the crystalline dimer below 0°C, the degree of crystallinity increasing with decreasing the reaction temperature. Maximal reaction rates were observed at 15°C in water and at 35°C in non-aqueous dispersants. Three kinds of dimers (crystalline p-FCA dimer·H2, and crystalline and amorphous p-FCA dimers) were interconvertible by appropriate treatments.
13C CHEMICAL SHIFTS OF SOLID POLYPEPTIDES BY CROSS POLARIZATION/MAGIC ANGLE SPINNING (CP/MAS) NMR SPECTROSCOPY: CONFORMATION-DEPENDENT 13C SHIFTS CHARACTERISTIC OF α-HELIX AND β-SHEET FORMS
Authors: Takit Toshihiko , Yamashita Shinsuke , Satoh Mitsuo , Shibata Akira , Yamashita Takura , Tabeta Ryota , Saitô Hazime
Published: July 2006

Conformation-dependent 13C chemical shifts of poly(l-valine), poly(l-isoleucine), and poly(lleucine) of α-helix and β-sheet forms in solid state were measured by cross polarization/magic angle spinning (CP/MAS) NMR spectroscopy. It is found that 13C shifts of Cα, Cβ and carbonyl carbons of the first two polypeptides exhibit significant conformation-dependent change, while those of poly(l-leucine) show little change.
CONVENIENT SYNTHESES OF PIPERAZINE-2,5-DIONES AND LACTAMS FROM HALOCARBOXAMIDES USING PHASE TRANSFER CATALYSTS
Authors: Okawara Tadashi , Noguchi Yoshihide , Matsuda Takashi , Furukawa Mitsuru
Published: July 2006

Inter- and intra-molecular N-alkylation of α-halocarboxamides and dihalocarboxamides in the presence of solid phase transfer catalyst led to the corresponding piperazine-2,5-diones (2) and lactams (4) in the yields of 64–88 and 63–99%, respectively. A one-pot synthesis of β-lactams (7) from α-methyl-α,β-dibromopropionyl chloride (5) and α-amino acid using phase transfer catalyst was also successfully achieved.
PREPARATION OF ACYL(CARBOXYLATO)NICKEL AND -PALLADIUM COMPLEXES M(COR)(OCOR’)L2 (M = Ni, Pd) AND REVERSIBLE REDUCTIVE ELIMINATION OF CARBOXYLIC ANHYDRIDES, RCOOCOR’
Authors: Komiya Sanshiro , Yamamoto Akio , Yamamoto Takakazu
Published: July 2006

Acyl(carboxylato)nickel(II) and -palladium(II) complexes, M(COR)(OCOR’)L2 2 are prepared by 1 : 1 reactions of MR(OCOR’)L2 1 with CO at −78°, whereas similar reactions in the presence of excess CO at room temperature afford the reductive elimination products, RCOOCOR’. Acid anhydrides add oxidatively to an Ni(0)-complex to afford a complex of the type 2.
IMPROVEMENT OF V2O5–TiO2 CATALYST FOR NOx REDUCTION WITH NH3 IN FLUE GASES
Authors: Morikawa Shigeru , Yoshida Hideto , Takahashi Kazumasa , Kurita Satoru
Published: July 2006

A study was made to retard the oxidation of SO2 to SO3 over V2O5–TiO2 catalysts developed for the NOx reduction in flue gases. An addition of oxide, which has small amounts of excess oxygen, to the V2O5–TiO2 was proved to be effective. Especially, the GeO2–V2O5–TiO2 revealed a high NOx conversion and a retardation for the SO3 formation.
THERMALLY REVERSIBLE FORMATION OF COBALT(III) TETRAPHENYLPORPHIN π-CATION RADICAL GENERATED FROM CHLOROTETRAPHENYLPORPHINATOCOBALT(III) IN CHLORINATED HYDROCARBONS
Authors: Yamamoto Kiyoko , Kohno Masahiro , Ohya-Nishiguchi Hiroaki
Published: July 2006

In the solution of chlorotetraphenylporphinatocobalt(III) (CoTPPCl) , a π-cation radical of six-coordinate Co(III)TPP is reversibly formed by thermal or light activation with a small enthalpy change.
DIRECT CONVERSION OF BENZYL ALCOHOLS INTO BENZYL SULFIDES WITH ORGANIC DISULFIDE/DIPHOSPHORUS TETRAIODIDE
Authors: Suzuki Hitomi , Sato Naofumi
Published: July 2006

Organic disulfides react with diphosphorus tetraiodide in hot benzene to give an orange-colored solution, in which benzyl alcohols are readily converted into the corresponding benzyl sulfides in fair to good yields.
CONFIGURATIONAL PRODUCT CONTROL IN REACTIONS OF TRANS- AND CIS-DIALKYLBIS(TERTIARY PHOSPHINE)PALLADIUM(II) WITH CARBON MONOXIDE. EVIDENCE SUPPORTING AN ALKYL MIGRATION MECHANISM IN CO INSERTION INTO Pd–C BOND
Authors: Ozawa Fumiyuki , Yamamoto Akio
Published: July 2006

Reactions of trans- and cis-PdR2L2 (R = Me, Et, Pr, and Bu; L = tertiary phosphine ligands) with carbon monoxide in solutions were found to give strikingly different products depending on the configurations of the dialkylpalladium complexes. The results can be explained reasonably by assuming reactions proceeding by alkyl migration mechanisms.
THE ASYMMETRIC DIELS–ALDER REACTIONS OF α,β-UNSATURATED CARBOXYLIC AMIDES DERIVED FROM (−)-PHENYLGLYCINOL AND THE ASYMMETRIC TOTAL SYNTHESIS OF (+)-FARNESIFEROL C
Authors: Mukaiyama Teruaki , Iwasawa Nobuharu
Published: July 2006

The asymmetric intramolecular Diels–Alder reactions of α,β-unsaturated carboxylic amides derived from (−)-phenylglycinol were studied and successfully applied to the asymmetric total synthesis of (+)-farnesiferol C.
(ALLYLTHIO)ACETATE DIANION AS A NEW AND CONVENIENT REAGENT FOR THE STEREOSELECTIVE SYNTHESIS OF (2E,4E)DIENOATES FROM ALKYL HALIDES
Authors: Tanaka Kazuhiko , Terauchi Makoto , Kaji Aritsune
Published: July 2006

Treatment of (allylthio)acetate with lithium diisopropylamide followed by the addition of s-butyllithium produced a new dianion which could react with a variety of alkyl halides exclusively at the allylic position. The high regioselectivity of the allylic alkylation could be realized in the case of methyl (allylthio)acetate dianion. A convenient and general method for the stereoselective synthesis of (2E,4E)dienoates from alkyl halides has been developed.
A MIMIC STUDY ON COENZYME-B12 USING ORGANOCOBALOXIMES, THE REARRANGEMENT OF 1-SUBSTITUTED-2-OXOCYCLOPENTYLMETHYL RADICAL
Authors: Tada Masaru , Miura Kyo , Okabe Masami , Seki Shigetaka , Mizukami Hideyuki
Published: July 2006

The radical cleavage of the carbon-cobalt bond of 1-phenyl-2-oxocyclopentylmethyl cobaloxime (1) and 1-ethoxycarbonyl-2-oxocyclopentylmethyl cobaloxime (2) gave only 3-phenylcyclohex-2-enone (7) and 3-ethoxycarbonylcyclohex-2-enone (8), respectively, by acyl migration. This rearrangement may be a reasonable mimicry of the ester migration mediated by coenzyme-B12.
[7],[9],[11],[13], AND [15]HETEROHELICENES ANNELATED WITH ALTERNANT THIOPHENE AND BENZENE RINGS. SYNTHESES AND NMR STUDIES
Authors: Yamada Koh-ichi , Ogashiwa Susumu , Tanaka Hisao , Nakagawa Hiroko , Kawazura Hiroshi
Published: July 2006

Syntheses of the title heterohelicenes are described and their NMR spectra showed the conspicuous phenomena reflecting the overlapping of aromatic rings.
ACID CLEAVAGE OF HUMULENE 9,10-EPOXIDE. ANOMALOUS PRODUCTS AND EFFECTS OF STRAIN ON THE REACTION COURSE
Authors: Shirahama Haruhisa , Hayano Kiyoharu , Ohtsuka Toshikazu , Osawa Eiji , Matsumoto Takeshi
Published: July 2006

Summary On treatment of humulene 9,10-epoxide with BF3·OEt2 in AcOH, seemingly anomalous products 6-acetoxy-7-hydroxy-2,9-humuladiene and 6-acetoxy-2,7(13),9-humulatriene were obtained together with known compounds 2,9-diacetoxy-1,5,8,8-tetramethylbicyclo[8,1,0]undec-5-ene, 9-acetoxy-1,5,8,8-tetramethyltricyclo[8,1,0,02,6] undec-4ene and -5ene. The reaction course was well explained by the strain energy of four possible intermediates expected at the first stage of the transannular reaction.
REDUCTION OF HALOBENZOIC ACIDS TO DEUTERATED BENZOIC ACIDS WITH RANEY ALLOYS IN NaOD–D2O SOLUTION
Authors: Tashiro Masashi , Nakayama Kouji , Fukata Gouki
Published: July 2006

Reduction of bromobenzoic acids with Raney Cu–Al alloy in 10% NaOD2O solution afforded the corresponding deuterated benzoic acids in high yields and in high isotopic purities. However, use of Raney Ni–Al alloy instead of Cu–Al alloy leads to the introduction of more than the expected number of deuterium atoms. It was also found that treatment of benzoic acid with Raney Ni–Al alloy in 10% NaOD–D2O solution gave a mixture of the deuterated benzoic acids.
THIN-LAYER CHROMATOGRAPHY AND QUANTITATIVE PHOTOACOUSTIC SPECTROMETRY. APPLICATION TO THE DETERMINATION OF NANOGRAM AMOUNTS OF COBALT,COPPER, IRON, AND NICKEL AS THEIR CHELATES WITH 1-(2-PYRIDYLAZO)-2-NAPHTHOL
Authors: Ikeda Shigero , Murakami Yoshiki , Akatsuka Kunihiko
Published: July 2006

A method is described for the determination of metal chelates on thin-layer chromatography plates using photoacoustic spectrometer. Nanogram amounts of Co, Cu, Fe and Ni can be determined up to (40–50) ng, respectively, with less than 5% of c.v. values. The detection limit is much improved by this method, e.g. 0.1 ng.
FACILE SYNTHESIS OF 2,3,4,6-TETRA-O-BENZYL-d-GLUCOPYRANOSYLIDENE ACETALS USING TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE CATALYST
Authors: Yoshimura Juji , Horito Shigeomi , Hashimoto Hiroriobu
Published: July 2006

The application of acetalization of aldehydes and ketones by alkoxysilanes in the presence of trimethylsilyl trifluoromethanesulfonate catalyst to lactones and di-O-trimethylsilyl-α-diols gave readily the corresponding spiro cyclic ortho esters.
THE TOTAL SYNTHESIS OF (±)-7α-(1-HYDROXY-1-METHYLETHYL)-4aβ-METHYL-1aβ-DECAHYDROCYCLOPROPA[d]NAPHTHALENE. COMMENT TO THE STRUCTURE OF CYCLOEUDESMOL
Authors: Ando Masayoshi , Sayama Shinsei , Takase Kahei
Published: July 2006

(±)-7α-(1-Hydroxy-1-methylethyl)-4aβ-methyl-1aβ-decahydrocyclopropa[d]naphthalene, which was belived to be the structure of cycloeudesmol, was stereoselectively synthesized and was found to differ from cycloeudesmol.
THE CONCEPT OF “SURFACE-TRAPPED HOLE” IN n-TYPE SEMICONDUCTORS AND THE CONDITIONS FOR EFFICIENT AND STABLE PHOTOELECTROCHEMICAL CELLS
Authors: Nakato Yoshihiro , Tsumura Akira , Tsubomura Hiroshi
Published: July 2006

The competition between decomposition and electron transfer reactions at an n-GaP electrode under illumination was explained on the basis of the concept of the “surface-trapped hole”. It is concluded that an efficient and stable photoelectrochemical cell can be constructed by use of a redox couple having the standard redox potential slightly more negative than the redox potential of the surface-trapped hole.
THERMAL DECOMPOSITION OF 17O-LABELED t-BUTYL o-METHYLTHIO- AND o-PHENYL-THIOPEROXYBENZOATES STUDIED BY 17O NMR. THE SULFURANYL RADICAL STRUCTURE OF THE o-THIOBENZOYLOXY RADICALS
Authors: Nakanishi Waro , Jo Toshihiko , Miura Kunio , Ikeda Yoshitsugu , Sugawara Tadashi , Kawada Yuzo , Iwamura Hiizu
Published: July 2006

t-Butyl o-methylthio- and o-phenylthioperoxybenzoates-[C=17O] were prepared and decomposed thermally in chlorobenzene. The oxygen labels were detected by 17O NMR spectroscopy preferentially at the carbonyl oxygen of 3,1-benzoxathian-4-one and diphenyl 2,2′-dithiodibenzoate, demonstrating the bridged sulfuranyl radical structures for the o-thiobenzoyloxy radicals.
INTERSYSTEM CROSSING AND LOWEST TRIPLET STATES OF 4-CHROMANONE, CHROMONE, AND FLAVONE
Authors: Hamanoue Kumao , Nakayama Toshihiro , Miyake Takao , Teranishi Hiroshi
Published: July 2006

Using pico- and nanosecond spectroscopy methods, Tn←T1 absorption spectra and their build-up times have been measured for 4-chromanone, chromone, and flavone. From these results, combined with the results of a conventional flash photolysis, the electronic configuration of the lowest triplet state was discussed.
THE IMPORTANT ROLE OF THE BULK OF 12-TUNGUSTOPHOSPHORIC ACID IN THE CATALYTIC DEHYDRATION OF ALCOHOLS TO OLEFINS
Authors: Okuhara Toshio , Kasai Atsushi , Hayakawa Nobukiyo , Misono Makoto , Yoneda Yukio
Published: July 2006

Organic compounds containing oxygen and nitrogen like alcohols and pyridine were readily incorporated into the bulk of heteropoly acids, while hydrocarbons such as butenes and benzene were adsorbed only on the surface. It was found in the dehydration of ethanol over H3PW12O40 that ethylene was yielded predominantly from absorbed ethanol in the bulk, whereas diethyl ether was formed on the surface.
CYCLOADDITIONS OF 4-SUBSTITUTED 3,5-DIMETHYL-5,6-DIHYDROANISOLES WITH METHYL ACRYLATE
Authors: Murai Akio , Sato Shingo , Masamune Tadashi
Published: July 2006

The title reactions proceeded smoothly and gave mixtures of four stereoisomeric cycloadducts differing in the configurations at C-8 and C-2, whose relative amounts varied depending on bulkiness of the 4-substituents and reaction temperature used.
A NEW DEHYDROGENATION REACTION OF INDOLINES TO INDOLES VIA AZASULPONIUM SALTS
Authors: Kikugawa Yasuo , Kawase Masami
Published: July 2006

Indolines (1) have been converted to the corresponding azasulfonium salts (2) and the subsequent intramolecular base catalyzed abstraction of the hydrogen at C-2 gave indoles(4) in good yields.
SELECTIVE REDUCTION OF ALDEHYDES WITH SODIUM TRIARYLOXYBOROHYDRIDES
Authors: Yamaguchi Shozo , Kabuto Kuninobu , Yasuhara Fujiko
Published: July 2006

Sodium tris-(3,5-dimethyl-, and 3,5-di-t-butylphenoxy)borohydrides soluble in tetrahydrofuran have been prepared. These stable hydride complexes exhibit an excellent chemoselectivity for thereduction of aldehydes in the presence of ketones.
MONITORED AMINOLYSIS OF 3-ACYL-l,3-THIAZ0LIDINE-2-THI0NE WITH AMINO ACID AND ITS DERIVATIVE: PEPTIDE BOND FORMATION, CHEMOSELECTIVE ACYLATION, AND BRIDGING REACTION
Authors: Nagao Yoshimitsu , Miyasaka Tadayo , Seno Kaoru , Yagi Masahiro , Fujita Eiichi
Published: July 2006

As a new extention of the monitored aminolysis of 3-acyl-l,3-thiazolidine-2-thione, its applications to peptide bond formation, chemoselective acylation of amino acid, and bridging reaction onthe enzyme model are reported.
COPPER(II) AND NICKEL(II) COMPLEXES OF A “STRATI-BIS” LIGAND, 1,2,3,4-TETRAKIS (SALICYLIDENEAMINO)-2,3-DIMETHYLBUTANE
Authors: Izumitani Tatsuo , Okawa Hisashi , Kida Sigeo
Published: July 2006

Copper(II) and nickel (II) complexes of a new binucleating ligand 1,2,3,4-tetrakis(salicylideneamino)-2,3-dimethylbutane (H4sata), Cu2(sata) 2.5H2O and Ni2(sata)2H2O, have been prepared and characterized. Electronic and ESR spectra indicated that there operates a magnetic interaction between the copper ions in Cu2(sata)2.5H2O, suggesting a stacking between the two CuN2O2 planes.
REINVESTIGATION OF RESONANCE RAMAN SPECTRUM OF RUTHENIUM RED AND ITS PHOTODEGRADATION
Authors: Itabashi Masao , Shoji Kazuo , Itoh Koichi
Published: July 2006

A photodegradation of Ru-red was found during the analysis of its resonance Raman spectrum; an apparent rate constant of the decomposition has been estimated to be about 10 s−1. Reasonable assignments are given to the Raman bands of Ru-red and its derivatives. A structural model is proposed to the compound in its aqueous solution.
PREPARATION AND OPTICAL RESOLUTION OF A NOVEL TRIAMMINEGLYCINATO-NITROCOBALT(III) COMPLEX
Authors: Fujinami Shuhei , Shibata Muraji
Published: July 2006

Three isomers of a new complex [Co(NO2)(gly)(NH3)3]Cl have been prepared and characterized from the ultra-violet absorption spectra in terms of the angular overlap model. A fac(NH3) isomer, which exhibits a novel optical isomerism due to the arrangement of the donor atoms, has been resolved by means of a column chromatography, and the CD spectra of the resolved isomers have been measured.
CATALYTIC POTENCY OF FUNCTIONALIZED (2,5)PYRIDINOPHANES AS NEW PYRIDOXAL MODEL COMPOUNDS
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi
Published: July 2006

Catalytic activities of new model compounds, 1a–c, 2, and 3, for the racemization of monosodium l-glutamate were shown to be more potent, ca. 1.5 fold, than that of pyridoxal, and catalyst, 1a, was stable enough to show no decomposition throughout the reaction.
STRUCTURES OF RHENIUM(VII) OXIDES ON ALUMINA AND THEIR CATALYTIC ACTIVITIES FOR METATHESIS OF OLEFINS
Authors: Nakamura Ryuichi , Abe Fumio , Echigoya Etsuro
Published: July 2006

IR studies revealed that the Re2O7/Al2O3 metathesis catalyst has two different surface rhenium species, [ReO4]ads− and [Re2O7]ads, which are similar in both structure and behavior to those in the aqueous solution of Re2O7. [Re2O7]ads, which is present only in high loading catalysts, should be responsible for their high catalytic activity for the metathesis of olefins.
1H-NMR EVIDENCE FOR η4-DIENE COORDINATION STRUCTURE OF ZrCp2(C4H6) AND HAFNACYCLO-3-PENTENE STRUCTURE OF HfCp2(C4H6) IN SOLUTION
Authors: Yasuda Hajime , Kajihara Yasushi , Mashima Kazushi , Lee Keoneil , Nakamura Akira
Published: July 2006

The temperature-variant 1H-NMR study of a 1,3-diene complex, ZrCp2(CH2CHCHCH2), in toluene-d8 showed the η4 -diene coordination structure below −40 °C, while the corresponding Hf complex assumed the metallacyclo-3-pentene structure in the wide temperature range of −90∼80 °C.
MECANISME DE CETONISATION DU PHENYLACETYLENE ACIDO-CATALYSEE PAR H2SO4, HSO3CH3 et BF3 (CH3COOH)2. MISE EN EVIDENCE DE L ’INTERMEDIATE ACETOXYSTYRENE
Authors: Montheard Jean-Pierre , Camps Marcel , Benzaid Ahmed
Published: July 2006

Acetic acid neacts with. phenylactylene in acid catalysis to give an intermediate product: α-acetoxystynene which nects fastly to give acetophenone. A kinetical study is shown.
STEREOSELECTIVITY EFFECTED BY INTER-LIGAND, “HYDROPHOBIC” INTERACTION IN TRIS(1-l-MENTHOXY-3-ACETYLACETONATO)COBALT(III) AND CHROMIUM(III)
Authors: Nakamura Michio , Okawa Hisashi , Kida Sigeo
Published: July 2006

Cobalt(III) and chromium(III) complexes of 1-l-menthoxy-3-acetylacetone (H(lC-moac)), Co(l-moac)3, have been synthesized and characterized. On the basis of NMR, electronic absorption and CD spectra, the complexes were demonstrated to have the cis-Λ-configuration. The stereoselectivity was attributed to the inter-ligand, “hydrophobic” interaction occuring between the l-menthyl and the methyl groups.
A SIMPLE SYNTHESIS OF DIHYDROJASMONE BY A NOVEL CYCLIZATION OF β,γ-ENONE
Authors: Fujisawa Tamotsu , Sakai Kunikazu
Published: July 2006

Dihydrojasmone was easily synthesized by bromination of 4-methyl-3-pentyl-4-penten-2-one, which was obtained by the alkylation of mesityl oxide, followed by the treatment with a base.
SYNTHETIC STUDIES ON IRIDOID TERPENES VIA REGIOSELECTIVE SULFENYLATION OF β-KETOESTERS AND OXIDATIVE CLEAVAGE OF β-THIOALCOHOLS —A NOVEL SYNTHETIC ROUTE TO (±)-LOGANIN—
Authors: Hiroi Kunio , Miura Hideyuki , Kotsuji Kumiko , Sato Shuko
Published: July 2006

Regioselective sulfenylation of ethyl 2-oxocyclopentanecarboxylate (3) and methyl 7 , 7-ethylenedioxy-3-oxobicyclo [3.3.0] octane-2-carboxylate (12), followed by NaBH4 reduction and subsequent oxidative ring cleavage with lead(IV) acetate gave ethyl 2-acetoxy-6-phenylthio-2,3,5,6-tetrahydro-4H-pyran-3-carboxylate (7) and methyl 3-acetoxy-6,6-ethylenedioxy-1,3,4,4a,5,6,7,7a-octahydro-l-phenylthiocyclopenta[c]pyran-4-carboxylate (15). Hydrolysis of the thioacetals (7 and 15) led to the 5,6-dihydro-6-hydroxy-4H-pyran-3-carboxylic acid esters characteristic of iridoid terpenes.
TRIBOLUMINESCENCE AND TRIBOPOLYMERIZATION OF 9-ETHYL-3-VINYLCARBAZOLE
Authors: Inoue Takashi , Tazuke Shigeo
Published: July 2006

9-Ethyl-3-vinylcarbazole(I) was found to be triboiuminescent as well as tribopolymerizable in crystalline state. When mechanical stress was applied to I crystals, the observed luminescence was identified as fluorescence by comparing with photoexcited emission from the crystals and also by energy transfer to singlet excited state of perylene. Tribopolymierization was confirmed by GPC analysis. Although correlation between triboluminescence and tribopolymerization was not clear, friction induced thermal polymerization was unlikely and the singlet excited state of I was tentatively considered as the precursor of initiating species.
STABILITY CONSTANTS OF COMPLEX FORMATIONS BETWEEN CYCLO(l-HISTIDYL-l-HISTIDYL) AND DIVALENT METAL IONS
Authors: Kojima Yoshitane
Published: July 2006

The stability constants of complex formation between cyhis [cyhis=cyclo(l-histidyl-l-histidyl)] as a ligand and some divalent metal ions were determined by Bjerrum’s method. The values of logK1, and logK2 in this order are: Co, 2.8, 2.3; Ni, 3.8, 2.6; Cu, 6.1, 4.9; Zn, 3.8, 2.9.
REACTIONS OF DICHLOROMANGANESE(IV) SCHIFF BASE COMPLEXES WITH WATER AS MODEL FOR WATER OXIDATION IN PHOTOSYSTEM II
Authors: Matsushita Takayuki , Fujiwara Manabu , Shono Toshiyuki
Published: July 2006

The dichloromanganese (IV) complexes with bidentate Schiff bases derived from 3-nitrosalicylaldehyde with monoamines react with water to liberate molecular oxygen. This is confirmed by means of a spectrophotometry with alkaline pyrogallol solution and by using an oxygen electrode. The maximal liberation was observed at neutral pH range. The reaction products were identified to the corresponding manganese(II) complexes. These results suggest us that molecular oxygen is liberated as follows, 2MnIVL2Cl2 + 2H2O→ 2MnIIL2 + O2 + 4H+ + 4Cl−.
SYNTHESIS OF 2-AMINO-3,8-DIMETHYLIMIDAZO[4,5-f]QUINOXALINE (Me-IQx), A POTENT MUTAGEN ISOLATED FROM FRIED BEEF
Authors: Kasai Hiroshi , Shiomi Tomoko , Sugimura Takashi , Nishimura Susumu
Published: July 2006

A potent mutagen, 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (Me-IQx), isolated from fried beef and its 3,7-dimethyl derivative were synthesized from 6-amino-3-methylquinoxa1ine and 6-amino-2-methylquinoxaline, respectively. These compounds showed strong mutagenic activity towards Salmonella typhimurium TA98 in the presence of S9 Mix.
SYNERGISM IN CHLORINE EVOLUTION ON NOBLE METAL-DOPED SnO2 FILM ELECTRODES
Authors: Iwakura Chiaki , Taniguchi Yoshikuni , Tamura Hideo
Published: July 2006

The dependence of the current density at given potentials on the RuO2 loading in Ti/SnO2–RuO2 electrodes was investigated in 3 M NaClO4 and 3 M NaCl solutions. The data show the existence of the synergism of SnO2 and RuO2 for chlorine evolution, but not for oxygen evolution.
REACTION OF IODOBENZENE WITH TRIMETHYLTIN CYANIDE IN THE PRESENCE OF TETRAKIS(TRIPHENYLPHOSPHINE)PALLADIUM: NEW COMPLEX FORMATION BETWEEN THE PALLADIUM AND THE CYANIDE
Authors: Kosugi Masanori , Kato Yasuki , Kiuchi Kazuhiko , Migita Toshihiko
Published: July 2006

There were found to be another possible way producing benzonitrile in the reaction of PhI with Me3SnCN in the presence of Pd(PPh3)4, beside the ordinary one involving the oxidative addition of PhI to the Pd complex. Thus, the complexation of Pd complex with Me3SnCN gives a new complex [Pd(PPh3)(Me3SnCN)2]n which reacts with PhI giving PhCN. This path is much faster than the former, but cannot make a catalytic cycle, because the palladium deposits during the reaction of the complex with PhI.
SYNTHETIC APPLICATION OF AMINOSILANES SELECTIVE FORMATION OF SECONDARY AMINES WITH AMINOSILANES
Authors: Ando Wataru , Tsumaki Hidetoshi
Published: July 2006

Aminosilanes readily react with alkyl halides in the presence of sodium methoxide under mild conditions to give N-alklyamines in good yields
BARRIERS TO ROTATION AND INVERSION IN 1,1′-BIPIPERIDINES
Authors: Ogawa Keiichiro , Takeuchi Yoshito , Suzuki Hiroshi , Nomura Yujiro
Published: July 2006

A 13C dynamic NMR of meso-1,1′-bi (2-methylpiperidine) s revealed that the barrier to the single-passing rotation about the N–N bond was at least 74.1 kJ mol−1, which was considerably higher than the barrier to the passing inversion of the nitrogen atom.
STEREOSELECTIVE FORMATION OF α,α-DIAMINO ACID RESIDUE BY THE ADDITION OF l-α-AMINO ACID TO α-IMINO ACID
Authors: Shin Chung-gi , Ohmatsu Hisao , Sato Yoshiaki , Yoshimura Juji
Published: July 2006

An addition of l-α-amino acids to β,β-dibromo-α-imino acids proceeded to give the corresponding optically active α,α-diamino acid derivatives. A several conversions of the products are also described.
STRUCTURE OF A NEW MODIFIED NUCLEOSIDE FORMED BY GUANOSINE-MALONALDEHYDE REACTION
Authors: Seto Hiroshi , Akiyama Kazuyuki , Okuda Taisuke , Hashimoto Tsuyoshi , Takesue Tomoyuki , Ikemura Tadashi
Published: July 2006

A new modified nucleoside was formed by the reaction of guanosine with malonaldehyde under acidic condition. This compound emitted strong yellow fluorescence and was hydrolyzed by NaOH into guanosine and malonaldehyde. Its structure was determined to be 1,N2-(1-propenyl-3-ylidene)guanosine by the spectroscopic analysis.
A BULKY LIGAND AND ITS ORGANOMETALLIC COMPOUND: SYNTHESIS OF HEPTAMETHYLINDENE AND A FERROCENE-TYPE COMPLEX, Fe(η5-C9Me7)2
Authors: Miyamoto T Ken , Tsutsui Minoru , Chen Li-Ban
Published: July 2006

A bulky new indene, 1-H-1,2,3,4,5,6,7-heptamethylindene, has been synthesized and its application to organometallic chemistry is suggested.
THE CORROBORATE OF THE PREDOMINANT LOCALIZATION OF RADIOACTIVITY ON THE DIMETHYLALLYL PYROPHOSPHATE-DERIVED MOIETY OF LINALOOL BIOSYNTHESIZED FROM RADIOISOTOPICALLY LABELED LEUCINE BY HIGHER PLANTS
Authors: Tange Keiji , Okita Hitoshi , Nakao Yoshitaka , Hirata Toshifumi , Suga Takayuki
Published: July 2006

The co-feeding experiment of leucine-4,5-3H and mevalonic-2-14C acid corroborated the preferential localization of radioactivity on the 3,3-dimethylallyl pyrophosphate-derived moiety of linalool in its biosynthesis from radioisotopically labeled leucine by cinnamomum Camphora Sieb. var. linalooliferum Fujita, in contrast to the predominant location of the activity on its isopentenyl pyrophosphate-derived moiety in the biosynthesis from mevalonic acid. Also, it was established that the imbalance in the localization of radioactivity is not influenced by exogenous administration of leucine or inhibition of isopentenyl pyrophosphate isomerase.
HIGH-PRESSURE HIGH-RESOLUTION N.M.R. PRESSURE DEPENDENCE OF THE PROTON CHEMICAL SHIFTS OF PHENYLACETYLENE AND CHLOROFORM
Authors: Yamada Hiroaki , Nishitani Shinji , Sera Akira
Published: July 2006

The acetylenic proton, in a striking contrast to the chloroform proton, exhibited a marked low field shift upon pressurization. Dissimilarity in the molecular shape between phenylacetylene and chloroform is considered to give rise to a difference in the high pressure association mode.
EFFECTS OF MACROMOLECULAR ASSOCIATION ON FLUORESCENCE AND PHOTODIMERIZATION BEHAVIORS OF POLYMERIC ANTHRACENE CHROMOPHORE IN AN AQUEOUS SOLUTION
Authors: Osada Yoshihito , Koike Masayoshi , Katsumura Etsuo
Published: July 2006

Anthracene chromophore attached to the chain end of poly(ethylene glycol) (PEG-Ant) was found to exhibit excimer fluorescence down to 10−7 M in an aqueous solution. Macromolecular association of PEG-Ant with poly(methacrylic acid) (PMAA) increased excimer emission intensity by a factor of 10 as well as the rate of photodimerization.
SYNTHESIS OF (+)-AVENIC ACID A
Authors: Ohfune Yasufumi , Nomoto Kyosuke
Published: July 2006

Avenic acid A (2), the metal chelator excreted from oat root and the factor which is considered to be directly involved in the uptake and transport of iron and other elements, has been synthesized efficiently from l-N[3-hydroxy-3-carboxypropyl]homoserine aldehyde, which could be a biosynthetic precursor.
UNUSUAL HIGH REACTIVITIES OF Δ5 STEROIDS IN PALLADIUM CATALYZED HYDROGENATION
Authors: Nishimura Shigeo , Takahashi Izumi , Shiota Michio , Ishige Masayoshi
Published: July 2006

Hydrogenation of a mixture of 3β-hydroxyandrost-5-en-17-one or cholesterol with α-pinene has revealed that the Δ5 steroids are more reactive than α-pinene over palladium while α-pinene is much more reactive than the Δ5 steroids with other platinum metals.
TOTAL SYNTHESIS OF SCELETIUM (AIZOACEAE) ALKALOIDS. THE CINNAMONITRILE ROUTE. THE TOTAL SYNTHESIS OF RACEMIC O-METHYL JOUBERTIAMINE AND MESEMBRINE
Authors: Sanchez Ignacio H , Tallabs F Ramón
Published: July 2006

A new method of synthesis of Sceletium (Aizoaceae) alkaloids based on the introduction of a “formyl anion” equivalent at the β-position of a cinnamonitrile, followed by Robinson annulation and final modification of the resulting cyanomethyl side chain is described. The method has been successfully applied to the total synthesis of racemic O-methyljoubertiamine (1) and mesembrine (2).
REDUCTION OF ACETYLENE TO ETHYLENE CATALYZED BY THE REDUCED SPECIES OF [Fe4S4(SPh)4]2− AND [Mo2Fe6S9(SPh)8]3−: A MODEL REACTION TO NITROGENASE
Authors: Tanaka Koji , Tanaka Masahiro , Tanaka Toshio
Published: July 2006

Reduction of acetylene to ethylene is catalyzed by [Fe4S4(SPh)4]n-([4-Fe]n-, n = 3, 4) or [Mo2Fe6S9(SPh)8]m- ([Mo–Fe]m-, m = 4, 5) produced by controlled potential electrolysis of [4-Fe]2− or [Mo-Fe]3− in MeOH/THF and in H2O. The catalytic activity increases in the order [Mo–Fe]4− << [4-Fe]3− ≅ [Mo–Fe]5− < [4-Fe]4−.
COLLOIDAL NICKEL BORIDE WITHOUT PROTECTIVE AGENT AND ITS CATALYTIC ACTIVITY FOR OLEFIN HYDROGENATION
Authors: Nakao Yukimichi , Fujishige Shoei
Published: July 2006

A stable dispersion of colloidal nickel boride was prepared from a dilute solution of nickel(II) chloride in ethanol by sodium borohydride reduction in the absence of protective colloid polymers. The colloid is superior to the conventional poly(vinylpyrrolidone)-protected one in the catalytic activity for the hydrogenation of styrenes and unsaturated carbonyl compounds.
ELECTRON SPIN RESONANCE SPECTRA OF 6-SILYL-SUBSTITUTED CYCLOHEXADIENYL RADICALS PRODUCED BY THE REACTION OF SILYL RADICALS WITH BENZENE
Authors: Kira Mitsuo , Sakurai Hideki
Published: July 2006

ESR spectra of three 6-silyl-substituted cyclohexadienyl radicals, generated by the reaction of the corresponding silyl radicals with benzene, are recorded and analyzed.
PREPARATION OF A MONOTERPENE ALKALOID BY THE THERMAL REACTION OF PROPARGYL 4-(3,5-DIMETHYL)PYRIDYL ETHER
Authors: Nitta Makoto , Sekiguchi Akio , Koba Hiroyuki
Published: July 2006

Thermal rearrangement of propargyl 4-(3,5-dimethyl)pyridyl ether afforded 3,7-dimethyl-5-azaindan-2-one which was transformed into racemic actinidine by the subsequent Huang-Minion reduction.
REACTION OF exo-2-NORBORNYL AND 1-ADAMANTYL p-TOLUENESULFONATES WITH SODIUM PHENOXIDE IN TETRAHYDROFURAN. IONIZATION OF THE SUBSTRATES UNDER “APPARENTLY-SN2” CONDITIONS
Authors: Takeuchi Ken’ichi , Kato Yukari , Moriyama Takamasa , Okamoto Kunio
Published: July 2006

exo-2-Norbornyl and 1-adamantyl tosylates react with sodium phenoxide in tetrahydrofuran via ionization, most probably through a cyclic transition state. The results call for attention in interpreting substitution reactions under “apparently-SN2” conditions.
ANODIC OXIDATION OF 2-PROPENYLPHENOLS
Authors: Iguchi Masanobu , Nishiyama Atsuko , Eto Hideo , Yamamura Shosuke
Published: July 2006

Anodic oxidation of 2-propenylphenols in MeOH was carried out under various conditions, using an undivided cell, to afford several oxidation products including the corresponding asatone-, carpanone-, arylpropanoid-, and austrobailignan-type compounds. Among them, the carpanone-type neolignans can be produced via the corresponding bis-o-quinonemethides.
LIQUID CRYSTALLINE STRUCTURES OF RANDOM COPOLYMERS OF l-LEUCINE AND γ-BENZYL-l-GLUTAMATE
Authors: Mori Norio
Published: July 2006

The cholesteric pitch of random copolymers of l-leucine and γ-benzyl-l-glutamate in solutions was measured as a function of temperature and the composition of the copolymer. It was found that the increase in leucine residue incorporated in the copolymer increased the temperature dependence of the cholesteric twisted angle.
CHEMILUMINESCENCE IN COLLISIONS OF N+ IONS WITH CO MOLECULES
Authors: Sasaki Hiromi , Inouye Hokotomo
Published: July 2006

Chemiluminescence which is presumed to be due to the transitions of excited CN+ ions formed by the reaction of N+ ions with CO molecules in the LAB energy range 40–150 eV was observed in the spectral range shorter than 3100 Å. Two line spectra due to the transitions of excited C atoms were clearly found. The C atom (1P) is thought to be produced also by an N+–CO reaction.
ELECTROCHEMICAL FORMATION OF 1,3,5-TRI (p-BIPHENYL)BENZENE PENTAANION
Authors: Saji Tetsuo , Aoyagui Shigeru
Published: July 2006

The cyclic voltammogram of 1,3,5-tri (p-biphenyl)benzene in 0.2 M (M = mol dm−3) TBAP-DMeE at −50 °C exhibits five reversible one-electron steps. This may be evidence for the electrochemical formation of mono-, di-, tri-, tetra- and pentaanions of this hydrocarbon. The formation of the pentaanion can be ascribed to the lower three π*-orbital s which are actually three-fold degenerate.
ESR STUDY OF THE CATION RADICAL OF Mn2(μ-AsPh2)2(CO)8
Authors: Hayashida Shigeru , Kawamura Takashi , Yonezawa Teijiro
Published: July 2006

Radiochemical oxidation of Mn2(μ-AsPh2)2(CO)8 in Freon mixture glass gives its cation radical, ESR spectra of which are most consistent with the odd electron orbital with σ*MnMn character consisting mainly of Mn 3d and As 4p atomic orbitals.