bluuebunny/crossref_metadata_2025 huggingface dataset:
THE ISOLATION OF CALCIUM CIS(N)TRANS(O5)-BIS(l-ASPARTATO)COBALTATE(III).CIS(N)TRANS(O6)-BIS(l-ASPARTATO)COBALTATE(III) DECAHYDRATE
Authors: Takeuchi Mitsuaki , Matsuda Toshitsugu , Shibata Muraji , Ohnishi Isao , Saito Yoshihiko
Published: July 2006

The crystals of a new type bis(l-aspartato)cobaltate(III) complex have been obtained as the calcium salt. From the absorption and circular dichroism spectra of this complex salt in solution, it has been found that the calcium salt is composed of equimolar amounts of the two cis(N) geometrical isomers.
THE SYNTHESIS OF ETHYL 2-ETHOXYCARBONYL-3,5-DIOXOHEXANOATE
Authors: Kashima Choji , Mukai Nobuhiro , Tsuda Yoshihiko
Published: July 2006

Ethyl 2-ethoxycarbonyl-3,5-dioxoiiexanoate (1-b) was synthesized by the hydrogenolysis and hydrolysis of diethyl (3-methyl-5-isoxazolyl)malonate (3-b), which was obtained by the di-carboxylation of 3,5-dimethylisoxazole (4) with ethyl cyanoformate in the presence of butyllithium.
FORMATION OF MIXED METAL COMPLEX IN THE EXTRACTION OF COBALT AND NICKEL WITH CAPRIC ACID IN BENZENE
Authors: Nakasuka Noriyuki , Ito Takashi , Tanaka Motoharu
Published: July 2006

A mixed metal complex was found in the extraction of cobalt and nickel with capric acid (HR) in benzene at 25°C and ionic strength of about 0.1 M in NaClO4. The extraction equilibrium is formulated as: Co2+ + Ni2+ + 4 (HR)2,0 \ightleftharpoons (CoNiR44HR)0 + 4 H+, and log Kmix=−19.1±0.1.
INTRAMOLECULAR HYDROGEN SHIFT AS A MECHANISM FOR THE ISOMERIZATION OF 1-BUTENE OVER CALCIUM OXIDE
Authors: Tani Nobutaka , Misono Makoto , Yoneda Yukio
Published: July 2006

Isomerization of 1-butene-3-d1 was studied over CaO and MgSO4. Small decrease in deuterium content and little formation of d2 species, as well as the existence of 2-butene-1-d1 , show that the reaction over CaO proceeds via intramolecular 1,3 hydrogen shift. Results with MgSO4, were consistent with a carbonium ion mechanism, which involves surface proton transfer to butene.
STEREOCHEMISTRY OF ELIMINATION REACTIONS OF HALOHYDRIN DERIVATIVE AND vic-DIBROMIDE BY BUTYLLITHIUM
Authors: Sugita Toshio , Nishimoto Kazuhito , Ichikawa Katsuhiko
Published: July 2006

Elimination of 1-bromo-2-methoxy-1,2-diphenylethane with n-butyllithium yielded stilbene in completely stereospecific cis manner in non-polar solvents. A solvent-dependence of the stereochemistry of the elimination reaction was observed.
THE YNi4B COMPOUND IN YTTRIUM-NICKEL-BORON SYSTEM
Authors: Niihara Koichi , Katayama Yoshimasa , Yajima Seishi
Published: July 2006

A new-type compound, YNi4B, has been prepared by an arc-melting technique. The unit cell is hexagonal with a=4.977±0.004Å and c=6.942±0.005Å, probable space group P6/mmm, and contains two formula units. The structure consists of two units of YNi5 structure (CACu5-type), the nickel positions partly substituted for by boron atoms.
CYCLIZATION OF POLYENES IX ASYMMETRIC CYCLIZATION OF OPTICALLY ACTIVE ESTERS
Authors: Kumazawa Satoru , Kato Tadahiro , Kitahara Yoshio
Published: July 2006

Optically active esters of homogeranic acid (1) and its related compounds (3,4) were subjected to cyclize under various conditions and 41.5% optical yield of (2) was gained when homogeranic acid-l-menthyl ester was treated with SnCl4 at −20°.
SPECIFIC CATALYSIS BY Co(II)PHTHALOCYANINE-TETRASULFONATE IN THE SELECTIVE REDUCTION OF ACETYLENE WITH SODIUM BORONHYDRIDE
Authors: Ichikawa Masaru , Sonoda Ryoshio , Meshitsuka Shunsuke
Published: July 2006

Co(II)phthalocyanine-tetrasulfonate sodium exhibits a specific catalysis for the selective reduction of acetylene with NaBH4 and the electric reduction with a cathodic voltage at above −1.0 v vs “sce”.
EFFECT OF HYDROGEN-ION CONCENTRATION ON THE POLAROGRAPHIC REDUCTION OF PENTAAMMINERUTHENIUM(III) COMPLEX
Authors: Ohyoshi Akira , Hamaoka Shigenori , Hiroshima Yutaka
Published: July 2006

Polarographic studies have been made on a series of pentaammineruthenium(III) complexes in various acidic solutions. The reduction process was found to be a reversible one with an electron-transfer at the dropping mercury electrode. The effect of hydrogen-ion concentration was markedly observed on the half-wave potential, i.e., its value shifted to the positive side with the increase in the hydrogen-ion concentration. This can be interpreted by assuming that the protonation occurs prior to the electrode process, so the electron density of ruthenium ion decreases.
UNUSUAL GLASS FORMATION IN THE Al–Nd-O SYSTEM
Authors: Yajima Seishi , Okamura Kiyohito , Shishido Toetsu
Published: July 2006

A new oxide glass in the Al–Nd–O system was made through fusing by arc plasma torch and rapid quenching by a particular device although, in this system, so far it was very difficult to realize the glassy state. Quenched material of about 5mm in diameter and about 1μ in thickness was examined by polarizing microscope and by X-ray diffraction technique. The results clearly showed the existence of the glassy state.
CYCLOADDITION REACTION OF 2-PHENYL-1-AZIRINE WITH AZIRIDINES
Authors: Matsumoto Kiyoshi , Maruyama Kazuhiro
Published: July 2006

A 1,3-dipolar reaction of 2-phenyl-1-azirine with a variety of aziridines afforded a novel type of heterocyclic compounds in excellent yield and thus the anomalously high dipolarophilic reactivity of 1-azirine was confirmed.
PYRROLIZIDINE ALKALOIDS. THE ABSOLUTE CONFIGURATIONS OF LATIFOLIC ACID AND ITS STEREOISOMERS
Authors: Matsumoto Takashi , Okabe Tetsuaki , Fukui Kenji
Published: July 2006

The absolute configurations of latifolic acid (IVa) and its stereoisomers (IVb, Va, and Vb) have been elucidated. (S)(+)-3-Methoxycarbonyl-2-methyl-cis-3-pentenoic acid (VIIIa), correlated to (S)(−)-2-methyl-1,4-butanediol (XII), was converted to latifolic acid (IVa: 2S,3S,4R) and Va (2S,3R,4S). Similarly, the enantiomer (VIIb) was also converted to IVb (2R,3R,4S) and Vb (2R,3S,4R). The CD spectra of these butyrolactones were also examined.
REACTION OF N-p-TOSYLSULFILIMINE WITH TRIVALENT PHOSPHORUS COMPOUNDS
Authors: Aida Tetsuo , Furukawa Naomichi , Oae Shigeru
Published: July 2006

The reaction of benzyl phenyl or methyl phenyl N-p-tosylsulfilimine with trivalent phosphorus compounds in DMF gave the original sulfide. From, the kinetic study the reaction mechanism is proposed to proceed via the initial nucleophilic attack by phosphine to sulfinyl sulfur atom. Meanwhile, the addition of water to the solvent changed both the products and kinetic results.
ACYLAMINATION BY MEANS OF N-BENZYLOXYCARBONYLCARBOXAMIDES
Authors: Morimoto Hiroo , Furukawa Tadashi , Miyazima Kyoko , Mitsunobu Oyo
Published: July 2006

The reaction of N-benzyloxycarbonylcarboxamides with alkyl sulfonates or halides gave N-alkylated and O-alkylated products. On treatment with HBr-AcOH, the N-alkyl-N-benzyloxycarbonylcarboxamides were converted to N-alkylcarboxamides. When N-benzyloxycarbonylbenzamide was allowed to react with (S)-(−)-ethyl lactate, triphenylphosphine and diethyl azodicarboxylate, followed by treatment with HBr-AcOH, (R)-(−)-N-benzoylalanine ethyl ester was obtained with high optical purity.
POLYMERIZATION OF α-OLEFINS WITH THE SUPPORTED ZIEGLER TYPE CATALYSTS; INFLUENCE OF THE CRYSTALLINE STRUCTURE OF THE CATALYSTS ON THE ISOTACTICITY OF POLYPROPYLENE
Authors: Soga Kazuo , Akiyoshi Masahiro , Kagiya Tsutomu
Published: July 2006

Various transition metal compounds were supported on magnesium hydroxide and propylene polymerization was carried out by using them as catalyst. The isotacticity of polypropylene was remarkably increased in comparison with that obtained with the use of carrier free catalyst, from which it has been concluded that the stereoregulation of polymer is mainly based on the crystalline structure of the catalyst not on the transition metal compound.
INTERACTION OF HYDROGEN WITH ALKALI METAL-ADDED ACTIVE CARBON AS REVEALED BY ESR
Authors: Ishizuka Manabu , Aika Ken-ichi , Ozaki Atsumu
Published: July 2006

Coconut carbon adsorbed with sodium or potassium vapor gives an ESR band at g=2.004 or 2.007 which diminishes on introduction of hydrogen, and catalyzes the H2-D2 exchange reaction, whereas the coconut carbon itself gives no such ESR and the catalytic activity.
A CONVENIENT SYNTHESIS OF ISOTHIOCYANATES FROM DITHIOCARBAMATES
Authors: Fujita Hiroshi , Endo Rokuro , Murayama Keisuke
Published: July 2006

Reactions of N,N′-disubstituted phenylpropiolamidines with triethylammonium N-substituted dithiocarbamates at room temperature afforded corresponding β-mercaptocinnamamidines and isothiocyanates in good yields, respectively. This constitutes a convenient route to isothiocyanates from dithiocarbamates.
THE SYNTHESIS OF 4′,5,6,7- AND 4′,5,7,8-TETRAHYDROXYFLAVANONE AND THEIR COMPARISON WITH CARTHAMIDIN AND ISOCARTHAMIDIN
Authors: Obara Heitaro , Onodera Jun-ichi , Yamamoto Fumitada
Published: July 2006

4′,5,6,7- and 4′,5,7,8-Tetrahydroxyflavanone (II and III) have been synthesized by the isomerization of 2′ ,3′ ,4,4′,6′ -pentahydroxychalcone (I), and the structures of carthamidin and isocarthamidin were corrected by the comparison with these synthetic flavanones.
PREPARATION OF Δ4-1,2,4-THIADIAZOLINE DERIVATIVES USING N-HALOAMIDINES
Authors: Fuchigami Toshio , Odo Keijiro
Published: July 2006

2-lmidoyl-3-imino-5-methylthio-Δ4-1,2,4-thiadiazolines [I] were easily prepared by the reaction of N-chloroamidines [II] with potassium methyl cyanoiminodithiocarbonate [III]. By reduction, [I] was readily cleft at the N–S link and was recyclized to two kinds of s-triazines, and by alkaline hydrolysis, [I] was converted into 2-amino-4-hydroxy-s-triazine.
MODIPIZIERTE WICHTERLE REAKTION. EIN NEUER WEG ZUR SYNTHESE VON Δ2-CYCLOHEXENONEN
Authors: Kobayashi Makoto , Matsumoto Takeshi
Published: July 2006

In stark protonierungsfähigen organischen Reaktionsmedien wie CH3CO2H–HClO4(9:1,V/V), CH3NO2–HClO4(9:1,V/V) usw. liefert die α-(3-Chlor-2-butenyl)-ketone die Δ2 -Cyclohexenone in hohen bis mässigen Ausbeuten. Die Natur und der Anwendungsbereich dieser Cyclisierungsreaktion wurden untersucht.
ISOLATION OF PALLADIUM(II) AND PLATINUM(II) COMPLEXES OF THE S+–N− YLIDE
Authors: Matsubayashi Gen-etsu , Toriuchi Masaharu , Tanaka Toshio
Published: July 2006

Several new stable ylide complexes formed between palladium(II) and platinum(II) dihalides and S,S-dimethyl-N-benzoyl- or S,S-dimethyl-N-p-methylbenzoylsulfilimine were isolated and the coordination through the ylide-nitrogen atom is concluded.
SYNTHESIS OF MONO(PYRIDINE)- AND MONO(4-SUBSTITUTED PYRIDINE) OCTAETHYLPORPHYRINATOIRON(III) PERCHLORATE
Authors: Ogoshi Hisanobu , Watanabe Ei-ichi , Yoshida Zen-ichi
Published: July 2006

Mono(pyridine)- and mono(4-substituted pyridine)octaethylporphyrinatoiron(III) perchlorate were prepared by treatment of octaethylporphyrinatoiron(III) chloride with silver perchlorate and successive addition of pyridine and 4-substituted pyridine, respectively. The spin states of monoamine adducts were found to be in equilibrium between high (S = 5/2) and low (S = 1/2) spin states.
A NOVEL FRAGMENTATION OF RING A IN 6α-HYDROXY-7-OXOABIETA-8,11,13-TRIENE AND FORMATION OF A β-NAPHTHOL DERIVATIVE
Authors: Matsumoto Takashi , Imai Sachihiko , Masuda Hideto , Fukui Kenji
Published: July 2006

In order to examine the fragmentation reaction of tricyclic diterpenoids, 6α-hydroxy-7-oxoabieta-8,11,13-triene (V) was prepared from 7-oxoabieta-8,11,13-triene (XI) via an enol acetate (XII). After V was treated with p-toluenesulfonyl chloride, the product was heated at 200°C to afford a β-naphthol derivative (IX).
A FACILE SYNTHESIS OF ANOMERIC Dl-TOLYPOSAMINE
Authors: Zen Shonosuke , Kaji Eisuke , Kohno Haruo
Published: July 2006

Anomeric mixture (α:β = 4:3 by NMR integration) of 4-nitro-2,3,4,6-tetradeoxyhexopyranose (1) could be synthesized from acrolein and 1-nitro-2-propanol in a reasonable yield. When α- and β-anomer of 2 were hydrogenated in the presence of Raney Nickel, the respective methyl Dl-tolyposaminides were obtained; α- and β-anomer of N-benzoyl derivatives (4) of 3 were identical with the authentic samples.
PREPARATION AND MAGNETIC PROPERTY OF BaNiO3 SINGLE CRYSTALS
Authors: Takeda Yasuo , Shimada Masahiko , Kanamaru Fumikazu , Koizumi Mitsue , Yamamoto Naoichi
Published: July 2006

Single crystals of BaNiO3(2H) were prepared under oxygen pressure of 2000 bars. They have a hexagonal unit cell with dimensions a=5.63±0.01, c=4.81±0.01Å. The space group is P\bar62C, P63mc or P63/mmc. its magnetic susceptibility is almost temperature-independent down to 4.2K, showing BaNiO3 to be diamagnetic.
A CONVENIENT METHOD FOR THE PREPARATION OF ALLYL ETHERS—THE REACTION OF α,β-UNSATURATED ACETALS WITH GRIGNARD REAGENTS ACTIVATED BY TITANIUM TETRACHLORIDE
Authors: Mukaiyama Teruaki , Ishikawa Hiroshi
Published: July 2006

In the presence of TiCl4, α,β-unsaturated acetals react with Gringard reagents to give the corresponding allyl ethers in good yields.
PHOTOLYSIS OF 2,3-DIPHENYLNAPHTHOQUINONE OXIDE: TRAPPING OF A BENZ[d]OXEPINE-1,5-DIONE, A SEVEN-MEMBERED MESOIONIC SYSTEM
Authors: Kato Hiroshi , Yamaguchi Kei , Tezuka Hiroshi
Published: July 2006

Photolysis of 2,3-diphenylnaphthoquinone oxide resulted in carbon–carbon bond cleavage to give a seven-membered mesoionic benz[d]oxepine-1,5-dione intermediate, which was trapped by N-phenylmaleimide and norbornadiene.
PHOTOCONDUCTIVITY OF N-ETHYLCARBAZOLE SINGLE CRYSTAL INDUCED BY A Q-SWITCHED RUBY LASER
Authors: Kato Keishi , Nogami Takashi , Yokoyama Masaaki , Mikawa Hiroshi
Published: July 2006

The intrinsic photoconductivity of N-ethylcarbazole single crystal induced by a Q-switched ruby laser was investigated. The experimental results show that charge carriers are uniformly generated in the bulk of the crystal by the photoionization of excitons produced by two-photon absorption.
SYNTHESIS AND VALENCE ISOMERIZATION OF 7-ALKYL-7-METHOXYCARBONYLCYCLOHEPTATRIENES
Authors: Tsuruta Haruki , Mori Seiichi , Mukai Toshio
Published: July 2006

7-Methyl- (IV), 7-ethyl- (V) and 7-isopropyl-7-methoxycarbonylcycloheptatrienes (VI) could be easily synthesized by alkylation of cycloheptatriene-7-carboxylic acid (I), followed by methylation with diazomethane. Valence isomerization between cycloheptatriene (a-form) and norcaradiene (b-form) is observed and steric factors controlling the equilibrium are discussed.
NOVEL PREPARATION OF 1,2,4-OXADIAZOLES FROM N-BENZOYLAMIDINES
Authors: Fuchigami Toshio , Odo Keijiro
Published: July 2006

A new efficient procedure for the conversion of N-benzoylamidines with t-butyl hypochlorite and sodium hydroxide to 1,2,4-oxadiazoles has been devised.
ESR SPECTRA OF THE PLEIADIENE ION RADICALS
Authors: Ikegami Yusaku , Iwaizumi Masamoto , Murata Ichiro
Published: July 2006

Treatment of pleiadiene with concentrated sulfuric acid generated the cation radical which exhibited a strong ESR signal. The anion radical of pleiadiene was produced by the treatment with an alkali metal. Hyperfine splitting constants for both ion radicals were discussed with the MO calculations.
THE ENERGY SURFACE OF [(CH)3(CH2)]+ CATIONS
Authors: Morio Kazuhiko , Masamune Satoru
Published: July 2006

Potential curves calculated for the [(CH)3(CH2)]+ system show that the cyclopropenylcarbinyl, planar cyclobutenyl, and bicyclobutyl cations, are all surrounded with relatively low energy barriers, if at all, and that they would readily collapse to the most stable conformer, puckered homocyclopropenyl cation 2b.
THE SELECTIVE N,N-DIALKYLATION OF PRIMARY AMINES USING CARBONYLFERRATE
Authors: Watanabe Yoshihisa , Mitsudo Take-aki , Yamashita Masakazu , Shim Sang Chul , Takegami Yoshinobu
Published: July 2006

N,N-Dialkylation of primary amines was successfully carried out in the presence of carbonyl compounds and carbonylferrate.
PHOTOLYSIS OF 3-DIPHENYLHYDROXYMETHYL-4-DIPHENYLMETHYLENECYCLOBUT-2-EN-1-ONE
Authors: Toda Fumio , Todo Eishiro
Published: July 2006

The photolysis of the title methylenecyclobutenone (I) in benzene afforded 5,5-diphenyl-4-diphenylvinylidene-l-oxacyclopentan-2-one (III) in 82% yield, probably via alleneketene intermediate (II). The photochemical conversion of 3,4-bis(diphenylhydroxymethyl)cyclobut-3-ene-1,2-dione (V) into 4,4,8,8-tetraphenyl-3,7-dioxabicyclo[3.3.0] octane-2,6-dione (VI) in 80% yield was also described.
THERMAL REACTIONS OF ALKOXYCYCLOHEPTATRIENES AT 300–800°C
Authors: Tezuka Takahiro , Handa Koichi , Mukai Toshio
Published: July 2006

The thermal reactions of methoxy- and ethoxycycloheptatrienes at several temperatures from 300 to 800°C were studied. 7-Alkoxycycloheptatriene (1) isomerized to the 1-isomer (3) at 450°C in quantitative yield, and rearranged to aromatic compounds (5–8) at temperatures higher than 450°C. These findings were not consistent with the observation of Harrison et al. that the dissociation of the O–CH3 bond in la occurred at 400°C to give the hydroxytropylium radical (11).
EFFECT OF SODIUM HYDROXIDE IN THE PLATINUM-CATALYZED STEREOSELECTIVE HYDROGENATION OF ALKYL-SUBSTITUTED CYCLOHEXANONES
Authors: Sugahara Motonori , Tsuchida Shin-ichi , Anazawa Ichiro , Takagi Yuzuru , Teratani Shousuke
Published: July 2006

The cis/trans ratio of the products was studied for the platinum catalyzed hydrogenation of 4-methyl-, 4-isopropyl-, and 4-t-butylcyclohexanone in the presence of bases. Contrary to both the von Auwers–Skita rule and the results for platinum oxide catalyst already reported, addition of sodium hydroxide promoted the formation of cis-isomer.
A NEW PHOTOCHEMICAL CLEAVAGE OF IMINES INTO NITRILES
Authors: Ohta Hiroyuki , Tokumaru Katsumi
Published: July 2006

Irradiation of N-(1-phenyl-2-propylidene)-benzylamine in benzene, in contrast to the photochemically unreactive most acyclic simple imines, results in the cleavage into acetonitrile, dibenzyl, and toluene probably through the reaction of the excited state of the imine analogous to the Norrish type I cleavage of carbonyl compounds.
PIGMENT IN SILKWORM SYSTEMS AS STUDIED BY ELECTRON SPIN RESONANCE. I
Authors: Fujiwara Shizuo , Nakajima Makoto , Nakaizawa Kenji
Published: July 2006

It has been shown that the formation of the pigments, i.e., ommochrome and melanine, as followed by ESR can be used to investigate hibernation, fertilization and the growth in each instar period in the silkworm system.
ORGANIC COMPOUNDS IN ALUMINUM OXIDE FILMS ANODIZED IN AQUEOUS CARBOXYLIC ACIDS
Authors: Shimura Michiko , Tajima Sakae
Published: July 2006

Organic compounds were isolated from brown-colored aluminum oxide films anodized in aqueous carboxylic acids. The isolated compounds were identified as the carboxylic acids utilized as electrolytes. The coloration is suggested to arise from free radicals in the organic compounds.
SULFUR-CONTAINING POLYMERS. XIV. POLY(BISCARBAMOYL DISULFIDES). A NEW TYPE OF PHOTOSENSITIVE POLYMERS
Authors: Kobayashi Norio , Osawa Akiko , Fujisawa Tamotsu
Published: July 2006

Poly(biscarbamoyl disulfides) have been synthesized by the interfacial polycondensation of dithiobis(carbonyl chloride) with secondary diamines. The polymers obtained in good yields were of sufficiently high molecular weight to form films. The polymer films decomposed by UV irradiation with liberation of carbonyl sulfide.
STUDIES ON NUCLEOSIDES AND NUCLEOTIDES. IV. SYNTHESIS AND REACTIONS OF 3′, 5′-O-(TRIPHENYL)PHOSPHORANTYLADENOSINE
Authors: Kimura Junji , Hashimoto Yoshio , Mitsunobu Oyo
Published: July 2006

The reaction of adenosine with triphenylphosphine (I) and diethyl azodicarboxylate (II) in dioxane at 70°C gave 3′,5′-O-(triphenyl)phosphoranyladenosine (III). This compound was readily hydrolyzed to give adenosine and triphenylphosphine oxide (1 : 1). The reaction of III with benzoic acid in dioxane gave 5′-O-berizoyladenosine and N3, 5′-cycloadenosine. On treatment with phenyl isocyanate, III gave 5′-O-phenylcarbamoyladenosine and 5′-O-phenylcarbamoyl-N6-phenylureidoadenosine, and with diphenylketene, III gave 5′-O-diphenylacetyladenosine and N6,5′-O-bis-diphenylacetyladenosine.
3Gd2O3·5Fe2O3 GLASS OBTAINED BY RAPID QUENCHING APPARATUS USING LASER BEAM
Authors: Yajima Seishi , Okamura Kiyohito , Shishido Toetsu
Published: July 2006

The oxide glass of 3Gd2O3·5Fe2O3 (GIG) was prepared using the piston and anvil technique incorporated into a laser melting furnace. The quenching apparatus provides higher quenching rates than an impact quenching apparatus already made. Crystallization and magnetization of the GIG glass have been examined by means of DTA method and magnetic balance.
THE INFLUENCE OF ELECTROPHILES ON THE REGIOSELECTIVE ALKYLATION OF AMBIDENT CARBANION FROM DIHYDROTHIOPYRAN
Authors: Torii Sigeru , Tanaka Hideo , Tomotaki Yosihisa
Published: July 2006

The reaction of ambident carbanion derived from dihydrothiopyran (Id) with alkyl halides, epoxides, and carbonyl compounds was examined. The results demonstrate that in the cases of alkyl halides selectivity in producing 2-alkyl-Δ3-dihydrothiopyrans increases in the order, Cl> Br> I. On the other hand, the carbonyl compounds gave exclusively 4-alkyl-Δ2-dihydrothiopyrans in contrast to the results obtained from the epoxides.
CATIONIC HYDRIDE COMPLEXES OF NICKEL
Authors: Saito Taro
Published: July 2006

A series of cationic hydride complexes of nickel [NiH(L) (PCy3)2]+BPh4− (PCy3 = tricyclohexylphosphine, L = pyridines, pyrazole and imidazole) have been synthesized and characterized.
REVERSIBLE FORMATION OF ACTIVE SITES ON SULFURATED NICKEL CATALYST
Authors: Takeuchi Atsushi , Tanaka Ken-ichi , Miyahara Koshiro
Published: July 2006

The active sites for hydrogenation are formed on sulfurated nickel by displacing sulfur atoms with acetylene, and when acetylene is exhausted, the sites are occupied by sulfur to result in inactive. The above process is ensured with the H2–D2 equilibration reaction, and makes clear the characteristic of the partial hydrogenation of acetylene over sulfurated nickel.
THE FIRST PROOF OF THE BIOSYNTHESIS OF ISOPRENOID FROM AMINO ACID IN HIGHER PLANT. THE INCORPORATION OF l-LEUCINE INTO LINALOOL
Authors: Suga Takayuki , Hirata Toshifumi , Shishibori Tsuyoshi , Tange Keiji
Published: July 2006

U-14C-l-Leucine and 4,5-3H-l-leucine were incorporated into linalool (I) in Cinnamomum Camphora Sieb. var. linalooliferum Fujita in 0.004% yield at the highest value. Its labeling patterns have indicated that DMAPP may originate not only from mevalonic acid but also from leucine not via the acid.
CATALYTIC ACTIVITIES OF ALKALINE EARTH METAL OXIDES FOR ISOMERIZATIONS OF 2-PINENE AND 2(10)-PINENE
Authors: Ohnishi Ryuichiro , Tanabe Kozo
Published: July 2006

The isomerization of 2-pinene or 2(10)-pinene over evacuated MgO, CaO, SrO and BaO catalysts was carried out at room temperature or 150°C. All catalysts were found to exhibit extremely high selectivities for the formation of 2(10)-pinene or 2-pinene. The highest activity was observed over SrO, where the isomerization took place at room temperature and attained its equilibrium in only 15 min.
THE ELECTRODE REACTION OF HEXAAMMINECHROMIUM(III) IN THE PRESENCE OF ETHYLENEDIAMINETETRAACETATE AND NITRATE IONS
Authors: Tanaka Nobuyuki , Kano Taisaku , Yamada Akifumi
Published: July 2006

It has been confirmed experimentally that Cr(NH3)63+ gives a catalytic wave on its polarogram in the presence of EDTA and NO3− ions according to the EC(C′E′)n type mechanism; Cr(NH3)62+ which is produced on the electrode surface by the electrochemical reaction reacts with EDTA rapidly to form Cr(II)-EDTA (denoted as EC), which in turn gives a catalytic wave in the presence of NO3− ions (denoted as (C′E′)n). In addition, it was suggested that the reduction intermediates of nitrate ion oxidize Cr(H2O)p(NH3)6−p2+ at an appreciable rate, which nitrate ion itself does not.
THE RAMAN SPECTRUM OF THE β-QUINOL ACETONITRILE CLATHRATE
Authors: Davies J E D
Published: July 2006

The Raman spectrum of the β- quinol acetonitrile clathrate which was recently reported in this journal is compared to the spectrum reported previously by the author.
THE CHARGE-TRANSFER INTERACTION AND SUCCESSIVE THERMAL (2+2)CYCLOADDITION OF α,β-UNSATURATED ETHERS WITH TETRACYANOETHYLENE
Authors: Arimoto Tateo , Osugi Jiro
Published: July 2006

An equilibrium study on the formation of 1:1 α,β-unsaturated ether-tetracyanoethylene complexes, and a kinetic study on the successive (2+2) cycloaddition reaction were made in CHCl3 and CCl4 in the temperature range 10–40°C by the spectrophotometric method. The behavior of the charge–transfer complexes in the initial process of this reaction was considered.
REACTION OF o-BENZOQUINONE MONO-IMINE WITH o-AMINOPHENOL
Authors: Hishida Tadanori , Nogami Takashi , Shirota Yasuhiko , Mikawa Hiroshi
Published: July 2006

o-Benzoquinone mono-imine was obtained for the first time in ether solution by oxidizing o-aminophenol with lead dioxide. The reaction of o-benzoquinone mono-imine with o-aminophenol was studied spectrophotometrically, and 2-aminophenoxazone was found to be formed as the reaction product. It is suggested that 2-aminophenoxazone is produced by cyclization reaction of the intermediate 2-amino-o-indophenol.
A NEW HEXACYCLIC TETRANORTRITERPENOID
Authors: Pachapurkar R V , Kornule P M , Narayana C R
Published: July 2006

Vilasinin, a new hexacyclic tetranortriterpenoid has been isolated from the green leaves of the neem tree and its structure determined. It appears to be a biogenetic precursor of salanin and nimbin.
A NEW SYNTHETIC METHOD FOR γ-SUBSTITUTED Δα,β-BUTENOLIDES
Authors: Iwai Kiyoshi , Kawai Mikio , Kosugi Hiroshi , Uda Hisashi
Published: July 2006

Reaction of the dilithio derivative of phenylthioacetic acid with terminal epoxides gave γ-substituted α-phenylthio-γ-butyrolactones, which were oxidized to sulfoxides and then pyrolyzed to give γ-substituted Δα,β-butenolides in moderate overall yields.
DRAG COEFFICIENTS OF BURNING POLYMER SPHERES DURING FREE FALLING AT ELEVATED PRESSURES
Authors: Saito Takeo , Iwama Akira
Published: July 2006

Photographical studies were made of the burning phenomena of carboxyl terminated polybutadiene (CTPB) and polyurethane (PU) spheres during free falling in pressurized oxidizing atmospheres (5–30kg/cm2). Both of polymeric fuel spheres yielded several times as large drag coefficients as non-burning standard solid spheres.
AN OXYGEN ADDUCT OF POLY-4-VINYLPYRIDINE-BOUND TRICHLOROTITAN1UM(III)
Authors: Chimura Yasuo
Published: July 2006

E.s.r. spectroscopic studies indicate the formation of a novel oxygen adduct of poly-4-vinylpyridine-bound TiCl3, whose electronic structure should be formally described as Ti(IV)–O2−.
MAGNETIC SUSCEPTIBILITY OF TRIS(2,2′-DIPYRIDYL)MANGANESE COMPLEXES HAVING AN ANOMALOUS VALENCY OF MANGANESE
Authors: Hara Ken-ichi , Inoue Motomichi , Horiba Tatsuo , Kubo Masaji
Published: July 2006

The magnetic susceptibility of tris(2,2′-dipyridyl)manganese complexes, [Mn(dipy)3] · 2THF and Li[Mn(dipy)3] · 4THF (THF: tetrahydrofuran), has been determined over a temperature range of 1.5–300 K. The susceptibility of Li[Mn(dipy)3] · 4THF can be explained with a radical ion model, in which three 2,2′-dipyridyl radical ions are coordinated to a manganese(II) ion, suggesting the formula [Mn2+(dipy−)3]− rather than [Mn−(dipy0)3]−. A similar model is applicable to [Mn(dipy)3] · 2THF as well.
3-ACYL-1,2-NAPHTHOQUINOLS FROM THE PHOTO-INDUCED REACTION OF 1,2-NAPHTHOQUINONE DERIVATIVES WITH ALIPHATIC ALDEHYDES
Authors: Maruyama Kazuhiro , Takuwa Akio
Published: July 2006

3-Acyl-1,2-naphthoquinols and 1,2-naphthoquinol monoacylesters were produced in the photochemical reactions of 1,2-naphthoquinones with a variety of aliphatic aldehydes. From the photochemical reactions of 3-halogeno-1,2-naphthoquinones with aliphatic aldehydes were obtained also 3-acyl-1,2-naphthoquinols; that is, the same products with those from the photochemical reactions of 1,2-naphthoquinone with aliphatic aldehydes, accompanying with 3-halogeno-1,2-naphthoquinol. monoacylesters.
ADDITION OF HYDROGEN CYANIDE TO 2,3-DIPHENYL-5,6-DIHYDROPYRAZINE: A LITERATURE CORRECTION
Authors: Walia Jasjit Singh
Published: July 2006

The structure of the product of reaction of 2,3-diphenyl-5,6-dihydropyrazine (1) with potassium cyanide and glacial acetic acid is established to be 2,3-dicyano-2,3-diphenyl-hexahydropyrazine (3) rather than the reported N,N′-dicyano-2,3-diphenylhexahydropyrazine (2).
POLYMERIZATION OF 2,3-DIHYDROFURAN DERIVATIVES. VI. ISOTACTIC POLYMER OF 2-METHYLENETETRAHYDROFURAN
Authors: Kamo Bunzo , Sakai Toshiyasu , Sudo Minoru , Inaba Masaharu , Furusawa Shijo
Published: July 2006

The microfine structure of poly(2-methylenetetrahydrofuran) obtained by various cationic catalysts was studied by NMR spectroscopy. Only a quartet was observed for the backbone methylene protons of the ethyl methyl ketone-insoluble polymer, which was found to be crystalline by X-ray analysis. The polymer is suggested to be primarily isotactic in nature.
ORIGIN AND DIRECTION OF NONEQUIVALENT ORBITAL EXTENSION AND STEREOCHEMICAL BEHAVIORS OF PLANE-ASYMMETRIC OLEFINS. EXO-ELECTROPHILIC ADDITION TO NORBORNENE
Authors: Inagaki Satoshi , Fukui Kenichi
Published: July 2006

Origin and direction of nonequivalent extending of orbitals with symmetric density distribution under influence of weakly conjugative entity was considered in a general manner. An application of the obtained results was found to shed new light on exo-stereoselectivity in electrophilic addition to norbornene.
NUCLEAR MAGNETIC RESONANCE STUDY OF EXCHANGING SYSTEMS. VI. ROTATIONAL BARRIER OF FORMANILIDE BY 13C NMR COMPLETE LINE SHAPE ANALYSIS
Authors: Nakanishi Hiroshi , Yamamoto Osamu
Published: July 2006

The complete line shape analysis of temperature-dependent 13C NMR spectra of formanilide in the system where the populations of the isomers change with temperature was performed by a modified Bloch equation method, and the activation parameters of the restricted rotation around amide bond were determined accurately.
SEPARATION OF THE HOMOLOGOUS SERIES OF ALKYLBENZYLDIMETHYLAMMONIUM HALIDES AND ALKYLPYRIDINIUM HALIDES BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY
Authors: Muto Giichi , Nakae Atsuo
Published: July 2006

Separations of the homologous series of alkylbenzyldimethylammonium chlorides and alkylpyridinium halides having the alkyl groups of C-10, C-12, C-14, C-16 and C-18 were carried out by high performance liquid chromatography. All components were well resolved and the logarithm of the capacity factor was directly proportional to the alkyl chain length.
PROTON RELAXATION AND THE SYMMETRY OF SPIN FUNCTIONS IN THE AB2 SYSTEM
Authors: Fujiwara Shizuo , Umezawa Yoshio , Arata Yoji , Furuyama Hideichi
Published: July 2006

Proton relaxation for nine aromatic AB2 systems were studied by saturation method. It has been concluded that singlet–triplet transition exists in all the systems examined. Possible mechanisms for this phenomenon were discussed briefly.
FORMATION OF IMINOPHOSPHORANES FROM ANTHRANILS AND TRIPHENYLPHOSPHINE
Authors: Nomura Yujiro , Kikuchi Yasushi , Takeuchi Yoshito
Published: July 2006

It was found chat benz[c]isoxazoles gave (2-acylphenyl)iminotriphenylphosphoranes upon heating with triphenylphosphine in toluene. These iminophosphoranes were considerably stable although they have two reactive groups for the Wittig-type reaction in orthoposition in a molecule. This fact as well as their spectral data suggested the existence of the resonance-stabilized chelate ring.
MÖSSBAUER SPECTROSCOPIC STUDIES OF THE EC-AFTER EFFECT IN 57Co-LABELLED [Co(NH3)6][Fe(CN)6], [Co(NH3)6][Cr(C2O4)3]3H2O, AND [Co(NH3)6][Fe(C2O4)3]3H2O
Authors: Sano Hirotoshi , Ohnuma Toshiaki
Published: July 2006

It has been demonstrated that oxalate ligands of trisoxalatochromate(III) and trisoxalatoferrate(III) complex anions located outside the first coordination sphere of the decayed atom are still involved in the local radiolytic processes initiated by the EC-decay. The yields of 57Fe species found in ferrous charge state were interpreted by using radiolytical data on potassium trisoxalatochromate(III) and trisoxalatoferrate(III).
LIGHT-INDUCED TRITIATION OF AROMATIC COMPOUNDS WITH PROPANETHIOL[S3H]
Authors: Takiguchi Hideki , Yoshida Kunio G , Ouchi Hidenaga , Yoshida Masayuki , Morikawa Naotake , Simamura Osamu
Published: July 2006

The aromatic tritiation induced by irradiation of mixtures of aromatic compounds and propanethiol[S3H] was studied with respect to the tritium distribution in the nucleus and the relative rate of tritiation. A mechanism involving a reaction of an excited aromatic molecule with the thiol is proposed.
TROPENYLATION, DETROPENYLATION AND SCHIFF BASE FORMATION IN THE REACTION OF 3,4,5-TRIMETHOXYANILINE WITH TROPENYLIUM ION
Authors: Tsunetsugu Josuke , Sato Masaru , Ebine Seiji
Published: July 2006

Tropenylation of 3,4,5-trimethoxyaniline (II) with tropenylium ion (I), generated by action of acid on 7-ethoxy-1,3,5-cycloheptatriene, gave C-tropenyl derivative (III) and its Schiff base (VI). Further reaction of (III) with (I) gave not only tropenylation products (IV) and (XI) but also detropenylation product (II). Detropenylation has proved to take place in the presence of acid.
REACTION OF VINYLOXYTIN. A NEW METHOD FOR THE PREPARATION OF β-HYDROXYALKANOATE
Authors: Shimada Eiichiro , Inomata Katsuhiko , Mukaiyama Teruaki
Published: July 2006

It was suggested that vinyloxytin was produced by passing gaseous ketene into a methylene chloride solution of tin alkoxide at low temperature. The vinyloxytin thus formed further reacted with various carbonyl compounds at low temperature in the presence of strong Lewis acid such as TiCl4, or AlCl3 to give the corresponding β-hydroxyalkanoates.
9-METHTLENETRICYCLO[4.3.1.0]DECA-2,4,7-TRIEEE DERIVATIVES
Authors: Murata Ichiro , Nakasuji Kazuhiro , Morita Takamitsu
Published: July 2006

9-Methylenetricyclo[4.3.1.0]deca-2,4,7-triene (3a) and its derivatives possessing electron releasing group such as bis(dimethylamino)- and bis(methylthio)-groups at the exo-methylene carbon atom (3b and 3c) were synthesized from bicyclo[4.3.1]decatetraenyl anion (2). It has been shown that the closed norcaradiene tautomers (3a, 3b and 3c) are preferable to the opened nonafulvene tautomers (4a, 4b, and 4c).
EFFECT OF THE INTRAMOLECULAR HYDROGEN BONDING ON THE ROTATIONAL BARRIERS OF THE C–N BOND IN N,N-DIMETHYLBENZAMIDES
Authors: Hirota Minoru , Todokoro Kazuo
Published: July 2006

The free energies of activation for the restricted rotation around the amide C–N bond has been determined for a series of o-substituted benzamides, and the extraordinarily low barrier in o-hydroxybenzamide is attributed to the effect of the intramolecular hydrogen bond.
CATALYTIC HYDROGEN TRANSFER REACTION ON THE POLYNAPHTHOQUINONE—SYNTHESIS OF ANILINE AND DECOMPOSITION OF HYDROGEN SULFIDE
Authors: Iwasawa Yasuhiro , Ogasawara Sadao
Published: July 2006

Catalytic hydrogen transfers on the polynaphthoquinone are reported. Both the dehydrogenated and the hydrogenated products were simultaneously gained. Nitrobenzene was catalytically reduced to aniline by the hydrogen transfer from substrates in the temperature range 285°–330°C. Hydrogen sulfide chosen as a simple sulfur-containing compound was rapidly decomposed on the polynaphthoquinone in the range 30°–100°C.
ESR STUDIES OF THE SPIN-EXCHANGE INTERACTION AND THE DIMERIC STRUCTURE OF N,N’-BIS(3-NITROSALICYLIDENE)-iso-BUTYLENEDIAMINOCOPPER(II) IN FROZEN NITROETHANE SOLUTIONS
Authors: Chikira Makoto , Isobe Taro
Published: July 2006

The temperature variation of the intensity of ΔM = 2 transitions over the range 4.2 to 1.7 K indicates that the triplet state lies 2.2±0.2 cm−1 above the ground singlet state. The computer simulations of the ESR spectra indicates that the dimeric structure has markedly changed from those of the other quadridentate Schiff base complexes of copper(II) in frozen solutions.
CYCLOADDITION REACTIONS OF CYCLOBUTENE WITH 7,9-DIALKYL-8H-CYCLOPENTA[a]ACENAPHTHYLEN-8-ONES. PHOTOAROMATIZATION AND VALENCE TAUTOMERISM
Authors: Matsumoto Kiyoshi , Uchida Takane , Maruyama Kazuhiro
Published: July 2006

Reactions of 7,9-dimethyl-, 7,9-diethyl-, and 7,9-di-n-propyl-8H-cyclopenta[a]acenaphthylen-8-oneswith dimethyl 1-cyclobutene-l,2-dicarboxylate afforded the corresponding decarbonylated 1:1 adducts, while a similar addition of 7,9-diisopropyl-8H-cyclopenta[a]acenaphthylen-8-one onto the cyclobutene gave a 1:1 adduct. The photoaromatization and valence tautomerization of these adducts were examined.
A NOVEL SULFENYLATION REAGENT. SYNTHESIS AND REACTIONS OF N-(ARYLTHIO)ISATINS
Authors: Furukawa Mitsuru , Suda Tchiaki , Hayashi Seigoro
Published: July 2006

N-(Arylthio)isatins (1) were prepared by treatment of arenesulfenyl chloride with isatin. The compounds 1 reacted with organometallic compounds, thiols, and sodium cyanide to give sulfides (2), disulfides (3), and thiocyanates (4).
ELECTROCHEMICAL PREPARATION OF URICASE-COLLAGEN MEMBRANE
Authors: Suzuki Shuichi , Sonobe Nobuyuki , Karube Isao , Aizawa Masuo
Published: July 2006

The electrochemical entrappment of uricase in the collagen fibril network has been developed. The activities of the uricase-collagen membrane prepared at pH 3.8 and at pH 10.4 were 43% and 20% respectively as was compared with that of the native enzyme.

The temperature dependence and the pH dependence of the activity of the membrane were similar to that of the native uricase, which indicated that the properties of uricase in the membrane remained unchanged in the electrochemical entrappment.
BACKBONE REARRANGEMENT IN DOLABRADIENE
Authors: Kitadani Masayuki , Kabuto Chizuko , Sakai Kunikazu , Yoshikoshi Akira , Kitahara Yoshio
Published: July 2006

Upon heating in formic acid dolabradiene (1) gives a mixture of hydrocarbons. Five backbone rearrangement products isolated from the mixture are assigned to Δ5(10)-8β-rimuene (2), Δ5(10)-rimuene (3), Δ1(10)-rimuene (4), Δ8(9)-pimaradiene (5), and Δ1(10),5-rimutriene (6a), respectively. Their formation mechanisms are also discussed.
SYNTHESIS OF PYRIMIDINE-FUSED 1,4-BENZODIAZEPINES
Authors: Kobayashi Shigeru
Published: July 2006

Synthesis of new pyrimidine-fused 1,4-benzodiazepines (3 and 4) was achieved by heating the corresponding 1,4-benzodiazepines (1) with formamide in the presence of phosphoryl chloride.
ON RADICALS IN GAMMA-IRRADIATED POTASSIUM TRIMETAPHOSPHATE
Authors: Kobayashi Yoshimitsu , Matsuura Niro , Indelli Antonio
Published: July 2006

The single crystal of K3P3O9 was irradiated by gamma-rays at room temperature. The pink colored crystal (absorption maximum at around 500 nm and esr spectrum with g=2.01 and a coupling constant of 36G.) was dissolved in aqueous iodide solutions and the liberated iodine was quantitatively measured. From the product analysis, the initial G values were determined as G(P4+) = G(P6+) = 0.27±0.05 at 20°C.
CATALYTIC HYDROGENATION OF EPOXIDE WITH TRISTRIPHENYLPHOSPHINERHODIUM CHLORIDE
Authors: Mochida Isao , Shirahama Shin-ichi , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

RhCl(PPh3)3 was found to hydrogenate catalytically butadienemonooxide, which has a double bond adjacent to the epoxide group, whereas it could not alkyl nor aryl epoxide at all. The catalyst also hydrogenated phenylcyclopropane which may have significant π-character in its three-membered ring. The substrate may have to have π-coordination ability to be hydrogenated with RhCl(PPh3)3.
THE CLAISEN REARRANGEMENT PROMOTED BY TITANIUM TETRACHLORIDE
Authors: Narasaka Koichi , Bald Edward , Mukaiyama Teruaki
Published: July 2006

In coexistence with TiCl4 and N-trimethylsilylacetanilide, allyl aryl ethers involving 2-butenyl phenyl ether and 3-methyl-2-butenyl phenyl ether were rearranged under mild conditions to afford allyl phenols in good yields.
ION EXCHANGE BASED ON COMPLEXATION USING A CHELATING AGENT-LOADED RESIN
Authors: Akaiwa Hideo , Kawamoto Hiroshi , Nakata Noriko , Ozeki Yoshishige
Published: July 2006

A chelating agent-loaded resin consisting of an anion exchanger and 8-quinolinol-5-sulfonic acid was prepared and the adsorption behavior of some metal ions was investigated in comparison with that toward a resin containing 8-quinolinol. Results showed that the chelate forming group in the former was effective for preconcentration and separation of divalent transition metals.
ISOTOPE EXCHANGE BY TRIBOCHEMICAL REACTION
Authors: Shirakawa Toshiaki , Shimizu Keisuke , Toi Keio , Ito Tomoyasu
Published: July 2006

Isotope exchange reaction H2 + D2 = 2HD occurs at room temperature tribochemically by vibration of SiC. This reaction, which is distinct from thermal reaction, has an induction period at initial stage and the rate of the reaction increases with increasing vibrating time.
STUDY ON TRIPLET-TRIPLET ENERGY TRANSFER BETWEEN LIKE MOLECULES USING ISOTOPIC MIXTURE
Authors: Inoue Akinori , Ebara Nozomu
Published: July 2006

A novel method is presented to elucidate triplet–triplet energy transfer between like molecules, in which phosphorescence decay is observed for rigid solutions containing both hydrogenated and deuterated organic molecules. It is shown that a critical transfer distance is obtained from the concentration dependence of the phosphorescence decay curves.
NEW SYNTHESIS OF 4-METHYL-2-METHYLAMINO-5-(N-METHYLTHIOCARBAMOYL)THIAZOLE BY THERMAL ISOMERIZATION
Authors: Yamamoto Yuichi , Yoda Reiko , Tamura Chihiro
Published: July 2006

A reaction of 4-methyl-2-methylaminothiazole (I) with methyl isothiocyanate gave 1,3-dimethyl-1-(4-methylthiazol-2-yl)thiourea (IIa), whose structure was established by an X-ray analysis. A thermal isomerization of (IIa) gave 4-methyl-2-methylamino-5-(N-methylthiocarbamoyl)thiazole (IIIa) in a good yield.
1H AND 13C NMR SPECTRA OF TETRAALKYLBORON ATE COMPLEXES. HYDRIDE CHARACTER OF α-HYDROGENS TO BORON
Authors: Yamamoto Yoshinori , Toi Hiroo , Sonoda Akio , Murahashi Schun-Ichi
Published: July 2006

1H and/or 13C NMR spectra of tetraalkylboron ate complexes (1–3) reveal that the α-hydrogens and/or α-carbons to boron are shielded in comparison with those of the corresponding trialkylboranes (4–6). These results indicate the hydride character of α-hydrogens in 1–3.
AN EXPERIMENTAL EVIDENCE FOR CIS ELIMINATION MECHANISM IN THE FORMATION OF A BREDT COMPOUND
Authors: Fujikura Yoshiaki , Inamoto Yoshiaki , Takaishi Naotake , Ikeda Hiroshi , Aigami Koji
Published: July 2006

Dehydrobromination of 3-bromotricyclo[5.3.1.03,8]undecane-2-exo-d (3d) gave almost exclusively the undeuterated Bredt olefin, demonstrating unequivocally a cis elimination mechanism.
STEREOCHEMISTRY OF THE HYDROGENATION OF METHOXYCYCLOHEXANONES OVER PLATINUM METALS. A POLAR GROUP EFFECT IN THE CATALYTIC HYDROGENATION OF A C–O DOUBLE BOND
Authors: Nishimura Shigeo , Katagiri Mamoru , Kunikata Yuzo
Published: July 2006

2- and 4-Methoxycyclohexanones give the alcohols of higher cis/trans ratios than the corresponding methylcyclohexanones in the catalytic hydrogenation over platinum metals. This trend is most clearly seen over iridium and platinum among the six platinum metals. Hydrogenation with platinum gives the alcohols of higher cis/trans ratios in t-butyl alcohol than in other solvents.
REACTION BETWEEN NITROAROMATIC COMPOUNDS AND NITRITE ION IN APROTIC POLAR SOLVENTS
Authors: Kobayashi Michio , Sakai Tamio , Minato Hiroshi
Published: July 2006

In hexamethylphophoramide, 18O-labelled nitrite ion readily exchanged with the nitro group of p-dinitrobenzene at 30°C, whereas the formation of p-nitrophenol by the O-attack of nitrite ion is much slower. p-Nitrochlorobenzene is quickly converted to p-dinitrobenzene by the N-attack of nitrite ion, and p-nitrophenol is the final product. The nitro group of p-nitrobenzonitrile is slowly exchanged with nitrite ion.
DIRECTION OF RING-OPENING OF A THIIRANIUM ION
Authors: Oki Michinori , Nakanishi Waro , Fukunaga Michio , Smith G David , Duax William L , Osawa Yoshio
Published: July 2006

2,2-Dimethyl-1-phenylthiiranium hexachloroantimonate was prepared in sulfur dioxide. The direction of ring-opening of the thiiranium ion was found to differ according to the reaction conditions. The structures of the products were determined by independent synthesis and by X-ray crystallography.
SYNTHESIS OF ENDURACIDIDINE, A COMPONENT AMINO ACID OF ANTIBIOTIC ENDURACIDIN
Authors: Tsuji Shinichi , Kusumoto Shoichi , Shiba Tetsuo
Published: July 2006

Enduracididine (1), a component amino acid of the antibiotic enduracidin, was synthesized starting from l-histidine. Bamberger cleavage of methyl l-histidinate followed by catalytic hydrogenation afforded a mixture of (2S,4R)- and (2S,4S)-2,4,5-triaminopentanoic acid derivatives. Deprotection and guanidination of them yielded 1 of the natural configuration and its diastereoisomer, i.e., the enantiomer of natural alloenduracididine respectively.
MEASUREMENT OF Mo+5 SPECTRA DURING METHANOL OXIDATION
Authors: Niwa Miki , Mizutani Makoto , Murakami Yuichi
Published: July 2006

Oxidation of methanol into formaldehyde on SnO2–MoO3 catalyst proceeds according to the redox mechanism of Mo+5\ightleftharpoonsMo+4.
HIGH STEREOSELECTIVITY IN COBALT(III)-7,7′-Me-sal2en COMPLEX CONTAINING l-PROLINE
Authors: Fujii Yuki , Isago Takashi , Sano Mitsuo
Published: July 2006

A new mixed cobalt(III) complex containing 7,7′-Me-sal2en and l-proline, cis-β-[Co(7,7′-Me-sal2en)(l-pro)], has been prepared from [Co(7,7′-Me-sal2en)] and l-proline in methanol (80%) by air oxidation. The reaction has proceeded stereoselectively to form (−)435-isomer, followed by slow isomerization to form finally (+)435-isomer (100%).
2-(3-METHYLBUTOXY)-1,3-BENZODITHIOLE: A CONVENIENT REAGENT FOR INTRODUCTION OF A CYCLIC DITHIOACETAL FUNCTION INTO 2- OR 3-POSITION OF INDOLES AND PYRROLES
Authors: Nakayama Jyuzo , Imura Mimiko , Hoshino Masamatsu
Published: July 2006

A new reagent, 2-(3-methylbutoxy)-1,3-benzodithiole, could be used to introduce a cyclic dithioacetal function into 2- or 3-position of indoles and pyrroles in almost quantitative yields under mild conditions.
A NEW METHOD FOR THE OXIDATION OF ALCOHOL TO CARBONYL COMPOUND
Authors: Saigo Kazuhiko , Morikawa Anri , Mukaiyama Teruaki
Published: July 2006

It was found that various triethyltin alkoxides, prepared easily from alcohols and triethyltin methoxide, are oxidized by bromine to give the corresponding carbonyl compounds in good yields.
HYDRODIMERIZATION OF ACRYLIC ESTERS BY HALOGENOTRIS(TRIPHENYLPHOSPHINE) COBALT COMPLEXES
Authors: Kanai Hiroyoshi , Okada Mitsuo
Published: July 2006

Acrylic esters were selectively hydrodimerized to adipic esters by halogenotris(triphenylphosphine) cobalt complexes in alcohol. The yield of a hydrodimer based on cobalt exceeded 100% in the presence of zinc. The addition of halides of alkali metals increased the yield.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON PHOTOCHEMICAL FREE RADICAL REACTIONS. THE SINGLET AND TRIPLET SENSITIZED PHOTOLYSIS OF DIBENZOYL PEROXIDE
Authors: Sakuragi Hirochika , Sakuragi Masako , Mishima Tamako , Watanabe Shoji , Hasegawa Masaki , Tokumaru Katsumi
Published: July 2006

Application of external magnetic field (0–14 kG) on the singlet and triplet sensitized photolysis of dibenzoyl peroxide scarcely affects the yield of phenyl benzoate resulting from cage recombination between benzoxyl and phenyl radicals, suggesting that only a slight fraction of the geminate product arises from radical pairs which can suffer the effect of magnetic field.
MICELLAR EFFECT ON THE PREPARATION OF POLY-β-ALANINE FROM β-ALANINE-S-ALKYL ESTERS
Authors: Kawabata Yasuziro , Kinoshita Masayoshi
Published: July 2006

S-Dodecyl, S-decyl, and S-octyl esters of β-alanine were reacted in water in the presence of a base at 100°C for 40 hours to give poly-β-alanine. The yields and the degrees of polycondensation for dodecyl, decyl, and octyl esters were 44, 24, and 2 % and 13, 12, and 20, respectively. Poly-β-alanine was not obtained from S-hexyl and S-ethyl esters. The specific acceleration of polycondensation reaction for the higher alkyl esters was explained by micellar effect.
A NEW ROUTE TO AMINONITRILES VIA CYANOSILYLATION OF SCHIFF BASES AND OXIMES
Authors: Ojima Iwao , Inaba Shin-ichi , Nakatsugawa Kimiyo , Nagai Yoichiro
Published: July 2006

Trimethylsilyl cyanide was found to react with Schiff bases and oximes in the presence of a catalytic amount of Lewis acids to afford N-trimethylsilyl-α-aminonitriles and N-trimethylsilyloxy-α-aminonitriles in excellent yields, which were easily hydrolyzed to the corresponding α-aminonitriles and α-hydroxyaminonitriles.