bluuebunny/crossref_metadata_2025 huggingface dataset:
Trialkylborane as an Initiator and Terminator of Free Radical Reactions. Facile Routes to Boron Enolates via α-Carbonyl Radicals and Aldol Reaction of Boron Enolates
Authors: Nozaki Kyoko , Oshima Koichiro , Utimoto Kiitiro
Published: July 2006

A variety of trialkylborane-induced reactions were examined for the preparation of the α-carbonyl radicals: (1) addition of alkyl radical to methyl vinyl ketone, (2) reduction of α-halo ketone, and (3) intramolecular radical addition to α,β-unsaturated carbonyl moiety. Trialkylborane reacted with α-carbonyl radicals to give boron enolates. The resulting boron enolates were efficiently trapped by carbonyl compounds to give β-hydroxy ketones in good yields.
Time Courses of the Numbers of Spins from a Single or Two Organic Compounds on a Decationated Y-Type Zeolite
Authors: Kashiwagi Hiroshi
Published: July 2006

The time courses of the number of organic radicals produced on the surface of a decationated Y-type zeolite (HY) were followed with electron paramagnetic resonance spectroscopy after the removal of heptane (a solvent). Regardless of the presence of the heptane, the relationship between the amount of adsorption and the number of spins for a binary system of HY and a single organic compound was linear and reversible, suggesting the significance of the presence of an adsorption equilibrium. On the surface of HY, there are two kinds of active sites possessing different times required for attaining constant numbers of spins. Cation radicals from a strong donor (perylene) adsorbed in advance on HY were gradually replaced by those from a weak donor (naphthalene), while a small number of cation radicals from naphthalene adsorbed in advance on HY remained after contact with a sufficiently large quantity of perylene. The coexistence of both donor and acceptor molecules on HY increased the number of both cations and anion radicals, which were significantly dependent on the order of adsorption.
Fluctuation of Local Field and Depolarization Ratio of the ν1 Raman Line of Carbon Tetrachloride in Carbon Disulfide Solution
Authors: Hyodo Shi-aki
Published: July 2006

The depolarization ratio of a molecule having Td symmetry has been expressed in terms of the mean-square fluctuation of the local field which is felt by a molecule in the condensed phase. The fluctuation of the polarizability at each position in the scattering volume was found to dominantly affect local-field fluctuation. The concentration dependence of the depolarization ratio for the ν1 Raman line of carbon tetrachloride in a carbon disulfide solution could be well described by this expression.
The Electronic Structure of the Fulvene Radical Cation
Authors: Takahashi Ohgi , Kikuchi Osamu
Published: July 2006

The molecular and electronic structures of the unsubstituted fulvene radical cation, FV+·, were investigated by ab initio SCF calculations. The planar 2A2 state, which corresponds to removing an electron from the butadienic moiety in the five-membered ring, was found to be the ground state of FV+·, and is more stable than the planar 2B1 state, which corresponds to an olefin radical cation, by about 26 kcal mol−1. The barrier to rotation around the exocyclic C–C bond in the 2A2 radical cation was calculated to be about 63 kcal mol−1. The importance of electronic relaxation in substituted fulvene radical cations is discussed in connection with the rotational barrier.
Effect of Batch Factor on a Binary Ion Exchange Equilibrium
Authors: Tanihara Koichi
Published: July 2006

The relation between the distribution coefficient of Cs+ on Mn+ form exchanger and the ratio of the solution volume to the exchanger weight (batch factor) at a constant loading of Cs+ has been investigated while taking the activity coefficients of ionic species into consideration when the initial concentration of Cs+ is changed.
Ion-Exchange Properties and Thermal Stability of Hydrous Titanium(IV)– Zirconium(IV) Oxide Ion Exchanger
Authors: Yamazaki Hiromichi , Inoue Yasushi , Kikuchi Naoki , Kurihara Hiroshi
Published: July 2006

Ion-exchange properties and thermal stability were studied for hydrous TiIV–ZrIV oxide ion exchangers with various contents of titanium. The cation-exchange capacity increased with the titanium content in the exchanger, along with a decrease in the anion-exchange capacity. Though the affinity for representative metal ions increases with the acidity of the exchange sites, no such simple relation holds for transition metal ions. Exchangers with 30 to 70 mol% Ti (the mol% of Ti to Ti+Zr) do not suffer from drastic changes in both the water content and crystallinity upon heating to 500°C; they are much more heat-resistant than component simple hydrous metal oxides. Though the total cation-exchange capacity decreases with increasing temperature during a heat treatment, only a minute amount of the acidic sites dissociating at a pH lower than the isoelectric point of the exchangers with ≤70 mol% Ti increases upon heating. The effect of a heat treatment on the distribution coefficients of cations has been explained by these observations.
Chemical Synthesis of Branched Oligoribonucleotides
Authors: Sekine Mitsuo , Heikkilä Jarmo , Hata Tsujiaki
Published: July 2006

This paper describes the full detail of the chemical synthesis of branched oligoribonucleotides by use of appropriately protected adenosine 2′,3′-diphosphate derivatives (13 and 30), as key intermediates, which were synthesized by a series of reactions involving phosphoryl rearrangement via a new phosphorylation process. Branched triribonucleotides ApCpG (21) and ApUpG (27) were obtained by using the synthetic unit 13. Several problems during these syntheses were discussed. The use of 30 as an improved building unit enabled us to prepare synthetic intermediates as neutral, i.e., fully esterified species which allowed facile purification of them by means of silica-gel column thin-layer chromatography throughout the synthesis of a branched hexaribonucleotide derivative CpUpGpApCpG.
Synthesis of Proline and 2-Piperidinecarboxylic Acid via Cobalt-Catalyzed Isomerization–Carbonylation of N-Acyl Unsaturated Cyclic Amines
Authors: Amino Yusuke , Nishi Seiichi , Izawa Kunisuke
Published: July 2006

N-Acyl derivatives of proline and 2-piperidinecarboxylic acid (pipecolic acid) were synthesized in moderate yield from N-acyl unsaturated cyclic amines through cobalt-catalyzed isomerization–carboxylation under hydroformylation conditions in the presence of H2O. A possible mechanism for the process is discussed which is related to that of the amidocarbonylation (cobalt-catalyzed formation of N-acyl α-amino acid from aldehyde, amide and carbon monoxide).
Synthetic Inorganic Ion-Exchange Materials LX. Ion Exchange and Chromatographic Separation of Alkali Metal Ions on Cubic Ammonium Molybdate–A Novel Cation Exchanger
Authors: Khan Abdul Jabbar , Abe Mitsuo , Tsuji Masamichi , Kanzaki Yasushi
Published: July 2006

The ion-exchange selectivity of H+-form of cubic ammonium molybdate (H-CAM) was studied for alkali metal ions in both HNO3 and NH4NO3 media. Ideal ion-exchange reaction was observed in both the media with high selectivity for Rb+ and Cs+. The selectivity sequence was found to be Li+<Na+<K+<Rb+<Cs+ in accordance with the Eisenman sequence-1 in both the media, with separation factors greater than the commercial polystyrene strong acid exchange resin. Efficient separation of alkali metal ions could be achieved on H-CAM column.
A Polarographic Study of the Glycine Complexes of Copper(II), Lead(II), Cadmium(II), and Manganese(II)
Authors: Yamashita Hiroshi , Nozaki Toru , Fukuda Yoshihito , Kabata Toshiyuki
Published: July 2006

From the polarographic behavior of copper (II), lead(II), cadmium(II), and manganese(II) in aqueous glycine solutions at an ionic strength of 0.4 mol dm−3 adjusted with sodium perchlorate, the species of the metal complexes and their stability constants were determined.
A New Type of Reductive Cleavage of Disulfide in Quadruply ortho-Substituted Diphenyl Disulfide by Neighboring Thiolate Anion
Authors: Fujihara Hisashi , Chiu Jer-Jye , Furukawa Naomichi
Published: July 2006

The reaction of bis[2,6-bis(bromomethyl)phenyl] disulfide with thiourea or sodium sulfide showed an unusual reductive. cleavage of disulfide linkage with elimination of bromine by neighboring-group participation of the generated thiolate anion. Its reaction gave the structurally intriguing thiols which indicated the facile anodic oxidation.
Preparation and Property of Zirconia-Pillared Montmorillonite Having Different Pillar Populations
Authors: Suzuki Kenzi , Horio Masakazu , Masuda Hiroyuki , Mori Toshiaki
Published: July 2006

Zirconia-pillared clay was prepared by ion-exchanging montmorillonites having different cation exchange capacities (CEC’s) in an aqueous solution of ZrOCl2. The amount of zirconia incorporated as pillars varied depending on the CEC of the starting clay. The interlayer distance was almost the same: ca., 0.8 nm. These findings suggest that the distance between pillars or the lateral distance should be different from one zirconiapillared clay to another. As a result of pillaring the surface area was 200–260 m2 g−1. The thermal stability was examined in terms of a decrease in the surface area after heating at elevated temperatures.
Hydrolytic Metalloenzyme Models. Micellar Effects on the Activation of the Hydroxyl Groups of N-Alkyl-2-(hydroxymethyl)imidazole Ligands by Cu2+ in the Transacylation of p-Nitrophenyl Picolinate
Authors: Tagaki Waichiro , Ogino Kenji , Tanaka Osamu , Machiya Koji , Kashihara Nobuyuki , Yoshida Toshiharu
Published: July 2006

The activation of the hydroxyl groups of two N-methyl/dodecyl-2-(hydroxymethyl)imidazole ligands by complexation with Cu2+ was investigated kinetically by observing the rates of the release of p-nitrophenol in the transacylation of p-nitrophenyl picolinate (PNPP). The kinetics were carried out in aqueous buffers of pH ranging from 4.5 to 8.0 at 25 °C in the absence of surfactant micelles for a hydrophilic N-methyl ligand, and in the presence of micelles for a lipophilic N-dodecyl ligand. The kinetic analyses indicated that the 1:1 and 2:1 complexes of the ligand and Cu2+ are active nucleophiles with the N-methyl and N-dodecyl ligand, respectively. The pKa’s of the hydroxyl groups of these complexes were determined to be 7.00 in water and 6.41 in aqueous CTABr micelles, respectively, by analyses of the pH-rate profiles. The rate constants, which show the nucleophilic reactivities of ionized hydroxyl anions of complexes toward PNPP, were determined to be kN=1.11×104 and 1.25×106 mol−1 dm3 s−1 with N-methyl and N-dodecyl ligands, respectively, indicating that the latter micellar complex is 100-times more active than the former non-micellar counterpart.
A Facile Synthesis of 2-Aza-1,3-butadienes
Authors: Okamoto Hidenori , Kato Shozo
Published: July 2006

2-Aza-1,3-butadienes bearing alkoxyl substituent were obtained easily by the reaction of ketimines with orthoesters. The reaction proceeded smoothly by the addition of small amount of p-toluenesulfonic acid. When acetals were used in place of orthoesters, the corresponding 2-aza-1,3-butadienes were similarly prepared.
Formation and Molecular Structure of the 2 : 1-Adducts of 1-Alkoxy-2-benzopyrylium-4-olates with Carbon Disulfide
Authors: Nakano Hirofumi , Tamura Hatsue , Ibata Toshikazu
Published: July 2006

The Rh2(OAc)4-catalyzed decomposition of alkyl o-(diazoacetyl)benzoates in the presence of carbon disulfide gave two 2 : 1-adducts of the intermediate 1-alkoxy-2-benzopyrylium-4-olates with carbon disulfide together with a small amount of 5-(o-alkoxycarbonylphenyl)-1,3-oxathiole-2-thiones. The intramolecular carbene-carbonyl reaction of the carbenoid generated by the decomposition of the diazo ketones was clarified to be much faster than the intermolecular attack on carbon disulfide. The molecular structure of the major 2 : 1-adduct of 1-methoxy-2-benzopyrylium-4-olate with carbon disulfide was determined by means of X-ray crystallography. The crystals of the adduct are triclinic with space group P\bar1, and with the unit-cell dimensions of a=12.213(1), b=11.846(1), c=7.0403(2) Å, α=93.395(6), β=102.147(5), γ=109.536(7)°, and Z=2. The final R value is 0.044 for 2597 observed reflections. The structure was confirmed to be (S-endo, S′-endo).
A Stopped-Flow Kinetic Study of the Solubilization of Acridine Orange and Its 10-Alkyl Derivatives into the Micelle of Sodium Dodecyl Sulfate
Authors: Kubota Yukio , Omura Naofumi , Murakami Kiyofumi
Published: July 2006

Stopped-flow method has been used to investigate the kinetics of the solubilization of Acridine Orange (AO, 3,6-bis(dimethylamino)acridinium chloride) and its 10-alkyl derivatives into the micelle of sodium dodecyl sulfate (SDS). The reaction curves of the SDS–AO and SDS–10-alkyl AO systems were characterized by single and double exponential functions, respectively. It was found that all the time constants are concentration dependent and approach limiting values at high reactant concentrations. The data were fitted by a minimal mechanism in which a rapid bimolecular step is followed by one (AO) or two (10-alkyl derivatives of AO) sequential isomerizations. All the rate constants determined for this mechanism markedly decrease with an increase in the length of the introduced alkyl chain. The equilibrium constants for the bimolecular and first isomerization steps do not highly depend on the size of the alkyl chain, while the equilibrium constant for the second isomerization step progressively increases with increasing it. The spectral changes with time indicate that the bound dye gradually migrates to more hydrophobic environment inside the micelle. These results lead to the conclusion that the steps in the proposed mechanism correspond to rapid adsorption of the dye to the micelle surface site, followed by reorientation of the dye and then migration of its alkyl chain into the hydrophobic region of the micelle.
Solvent Extraction of the Hexaaquarhodium(III) Ion from Halogenated Carboxylate Solutions with Trioctylphosphine Oxide
Authors: Imura Hisanori , Takahashi Hiromi , Suzuki Nobuo
Published: July 2006

The extraction equilibrium of the inert hexaaquarhodium(III) ion has been studied. Rhodium(III) was quantitatively and rapidly extracted from 0.10 mol dm−3 trichloroacetate (TCA) or 0.010 mol dm−3 pentadecafluorooctanoate solutions to heptane containing 0.10 mol dm−3 trioctylphosphine oxide (TOPO) at pH 3–5. The extraction equilibria were achieved within 1 min at 298 K. From the equilibrium study in the TCA-TOPO system, the rhodium(III) species extracted into heptane was found to be Rh·3TCA·4TOPO, and the extraction constant was 1012.29. The rhodium(III) species in the organic phase was suggested to be the hexa-aquarhodium(III) complex associated with TCA and TOPO.
NMR Spectra of Organogermanium Compounds. X. Syntheses, 13C and 73Ge NMR Spectra and Molecular Mechanics Calculations of Germacyclopentanes and Germacyclopentenes
Authors: Takeuchi Yoshito , Tanaka Katsumi , Harazono Toshie
Published: July 2006

Germacyclopentane, its 1-methyl, and 1,1-dimethyl derivatives together with some germacyclopentenes were prepared and their 13C and 73Ge NMR spectra were determined. Molecular mechanics calculations of germacyclopentanes indicate that the symmetric twist form is the most stable in contrast to cyclopentane where the envelop and twist forms have much the same energy. Though both 13C and 73Ge chemical shifts are less sensitive to the stereochemistry of the methyl group as compared with the corresponding germacyclohexanes, the spectroscopic results can be explained in terms of the structures as depicted by molecular mechanics calculations.
Flash Photolysis Study for Halogen Abstraction of and Ph3Sn· and Ph3Si· from Alkyl Halides
Authors: Ito Osamu , Hoteiya Kiyohiko , Watanabe Akira , Matsuda Minoru
Published: July 2006

The reaction rate constants for halogen abstraction of Ph3Sn· and Ph3Si· have been determined by xenon-flash photolysis method. The absolute rate constants for the reactivity of Ph3Sn· with several alkyl halides have been compared with the relative ones; the agreement between the both methods was fairly good. For Ph3Sn·, the rate constant (in unit of mol−1 dm3 s−1) of n-BuCl (5.2×102) was smaller than that of n-BuBr (3.1×106) by a factor of ca. 1⁄104. With changing the alkyl halides, the rate constants for Ph3Si· and Ph3Sn· varied similarly, although the rate constants for Ph3Si· were larger than those for Ph3Sn· by factors of 50–100. The reactivity of alkyl halides increased with a decrease in the bond-dissociation energy of the R–X (X=Cl, Br).
THE SYNTHESIS AND CONFIGURATION OF FUKIIC ACID DERIVATIVES
Authors: Matsumoto Takashi , Hidaka Kazuo , Nakayama Teruko , Fukui Kenji
Published: July 2006

Fukiic acid derivatives have been synthesized from 3,4-dimethoxyphenylpyruvic acid by a stereospecific method. The synthetic methyl (+)-erythro-2,3-dihydroxy-4-(3,4-climethoxyphenyl)-3-methoxycarbonylbutyrate was shown to be identical with natural O,O′-dimethylfukiic acid dimethyl ester by a direct comparison.
THIOPYRYLIUM ION AS AN ELECTRON ACCEPTOR IN CHARGE-TRANSFER COMPLEX FORMATION
Authors: Yoshida Zen-ichi , Yoneda Shigeo , Sugimoto Toyonari
Published: July 2006

Thiopyrylium ion (I) has been found to form the CT complex having two CT absorption bands with olefin. Appearance of the two CT bands is rationalized by the existence of two closely located vacant orbitals of I.
ON THE PHOTOLYSIS OF ETHANE AND ITS DERIVATIVES ADSORBED ON ALUMINA
Authors: Fujieda Shigeaki , Setaka Morio , Kwan Takao
Published: July 2006

The photolysis of ethane adsorbed on alumina gave rise to an ESR spectrum consisted of ten hyperfine lines instead of twelve. It was suggested that S–\dotCHCH3 radicals are formed and that the methyl group can not rotate freely around the C–C axis.
SINGLET-TRIPLET EQUILIBRIUM IN TRIS(DIPIVALOYLMETHANATO) EURO PIUM(III) AS EVIDENCED BY PROTON MAGNETIC RESONANCE
Authors: Sakaguchi Ushio , Kunugi Masayuki , Fukumi Toshio , Tadokoro Shin’ichi , Yamasaki Akira , Fujiwara Shizuo
Published: July 2006

Temperature dependence was measured of the proton chemical shift of the shift reagent Eu(DPM)3. The shift deviates from the McConnell–Robertson equation below 200°K. This behavior was explained in terms of the low-lying first excited triplet 7F1 state.
HYDROXYLATION OF ANISOLES BY PHOTOOXYGENATION IN THE PRESENCE OF LEWIS ACIDS
Authors: Nagamachi Tamoaki , Niskcnaga Akira , Matsuura Teruo
Published: July 2006

Irradiation of anisoles in the presence of oxygen and a Lewis acid gave hydroxyanisoles where BF3 caused only ortho-hydroxylation and AlCl3 did ortho- and para-hydroxylation.
THE STRUCTURES OF EREMOFUKINONE, 9-ACETOXYFUKINANOLIDE AND S-JAPONIN FROM PETASITES JAPONICUS MAXIM
Authors: Naya Keizo , Kawai Masao , Naito Masami , Kasai Tsuneo
Published: July 2006

This paper deals with the structural determination of three new sesquiterpenes, eremofukinone (I), 9-acetoxyfukinanolide (II) and S-japonin (III), which were isolated from Petasites japonicus Maxim.
THE CODIMERIZATION OF PROPYLENE WITH ETHYLENE OVER NIO–WO3–Al2O3
Authors: Echigoya Etsuro , Kobayashi Atsuo
Published: July 2006

The codimerization of propylene with ethylene on various solid catalysts was investigated and the results compared with the dimerization reaction of ethylene and propylene. NiO–WO3–Al2O3 catalyst was found to be most active for codimerization. Besides dimerization reactions, isomerization was also observed on these catalysts.
INSERTION OF ETHOXYCARBONYLNITRENE INTO C–H BONDS OF CYCLIC ETHERS
Authors: Shingaki Tadao , Inagaki Masao , Torimoto Noboru , Takebayashi Matsuji
Published: July 2006

Ethyl azidoformate was photolyzed in three to six membered cyclic ethers. The α-C–H and α-methyl C–H bonds of cyclic ethers were observed to have unusually large reactivities compared with those of the corresponding C–H bonds of hydrocarbons in the insertion of ethoxycarbonylnitrene. On the anomalous reactivities, a mechanism has been advanced in which an O–N ylide is included as an intermediate of the insertion reaction.
AN X-RAY STUDY OF CRYSTALLINE-STATE PHOTO-POLYMERIZATION OF 1,4-BIS-(β-PYRIDYL-(2)-VINYL)-BENZENE
Authors: Nakanishi Hachiro , Ueno Katsuhiko , Hasegawa Masaki , Sasada Yoshio
Published: July 2006

The crystal and molecular structure of l,4-bis-(β-pyridyl-(2)-vinyl)-benzene (C20H16N2) was determined. Change of crystal structure on polymerization was investigated by X-ray diffraction method. The polymer obtained is three-dimensionally oriented and the molecular arrangement in the original crystal is preserved in the resultant crystal.
STUDY OF CHEMILUMINESCENCE BY MEANS OF CROSSED BEAMS: NITRIC OXIDE-OXYGEN ATOM SYSTEM
Authors: Ibaraki Takamasa , Kusunoki Isao , Kodera Kumasaburo
Published: July 2006

NO–O chemiluminescence was studied by means of crossed molecular beams. Anomalously bright light emissions have been observed with low temperature NO beams. It is considered that the chemiluminescence is caused by the two-body collisions between NO dimers and O atoms. Radiation cross section is estimated to be about 2×10−15 cm2.
NITRATION OF TOLUENE WITH NITRIC ACID IN THE PRESENCE OF AROMATIC SULFONIC ACIDS SUPPORTED ON THE POROUS MATERIALS
Authors: Kameo Takashi , Manabe Osamu
Published: July 2006

It was found that nitration of toluene with nitric acid catalyzed by aromatic sulfonic acids supported on the porous materials gave mononitrotoluene of the high para-isomer content. Thus, nitration catalyzed by toluene-2,4-disulfonic acid supported on Celite-545 gave higher para:ortho ratio (1.60) than that of mixed acid nitration (0.6).
THE CRYSTAL STRUCTURE OF 3,3′-DIETHYL-THIACYANINE BROMIDE
Authors: Nakatsu Kazumi , Yoshioka Hiroshi , Aoki Takao
Published: July 2006

The crystal structure of the title compound was determined by X-ray analysis. The dye ion has approximately Cs symmetry. The short S…S distance(2.994 Å) implies a strong interaction between them. The cations are stacked on top of each other along the c-axis with the separation of about 3.5 Å.
δ-CUPARENOL, A NEW SESQUITERPENE PHENOL FROM THE LIVERWORT, BAZZANIA POMPEANA
Authors: Matsuo Akihiko , Nakayama Mitsuru , Hayashi Shûichi
Published: July 2006

During the course of the investigation on the chemical constituents of the liverwort, Bazzania pompeana, a new sesquiterpene phenol, δ-cuparenol, was isolated as a minor component. The evidence for the proposed structure (I) is described.
THE KINETICS OF QUATERNIZATION OF N,N,N′,N′-TETRAMETHYL-α,ω-ALKANEDIAMINES WITH BUTYL BROMIDE
Authors: Murai Koichi , Kimura Chikai
Published: July 2006

Competitive and consecutive reaction of N,N,N′,N′-tetramethyl-α,ω-alkanediamines with butyl bromide was studied in propylene carbonate at different temperatures. The kinetic data have revealed the effects of the chain lengths of alkanediamines on the reaction.
APPARENT MOLAL VOLUMES OF POLYETHYLENIMINE HYDROCHLORIDE AND ITS OLIGOMERS IN DILUTE AQUEOUS SOLUTION
Authors: Sakurai Masao , Nakajima Toshio , Komatsu Tsuyoshi , Nakagawa Tsurutaro
Published: July 2006

The apparent molal volumes of polyethylenimine hydrochloride and its low-molecular-weight analogues have been measured as a function of concentration at 25°C. The partial molal volume of monomer unit increases with increasing the molecular weight of the polysalts. This has been interpreted in terms of two types of the overlapping of the electrostrictional effect on water molecules.
ON THE CARBON MONOXIDE ADDUCT FORMATION OF A COBALT–TETRAOXIME COMPLEX
Authors: Backes Joseph , Masuda Isao , Shinra Koichiro
Published: July 2006

In a hydrazine hydrate/DMA solution CoCl2·6H2O and CH3C(NOH)C(NOH)–(CH2)10–C(NOH)C(NOH)CH3 were found to absorb up to 0.5 mole of CO per 1 mole of cobaltous ion to form a CO adduct which releases CO in air to give a Co(II)–tetraoxime complex. A Co(I)-tetraoxime intermediate is considered to be the reactive species toward CO.
A NOVEL SYNTHESIS OF 2,4-DIOXO-1,2,3,4-TETRAHYDROPYRROLO[2,3-d]PYRIMIDINE DERIVATIVES
Authors: Senda Shigeo , Hirota Kosaku
Published: July 2006

6-Hydrazinouracil derivatives were allowed to react with ketones or aldehydes to give 5,6-disubstituted 2,4-dioxo-1,2,3,4-tetrahydropyrrolo[2,3-d]pyrimidine derivatives. The mechanism for the formation of these compounds is presented.
MECHANISM OF THE REDUCTION OF THIOBENZOPHENONE BY N-BENZYL-1,4-DIHYDRONICOTINAMIDE. A MODEL REACTION FOR BIOLOGICAL NAD(P)H-REDUCTION
Authors: Ohno Atsuyoshi , Kito Noboru
Published: July 2006

A charge-transfer intermediate has been detected, by ESR spectroscopy, for the reaction of thiobenzophenone with N-benzyl-1,4-dihydronicotinamide, a model of biological redox processes.
A NEW SYNTHESIS OF CARBAMATES. THE REACTION OF CARBON MONOXIDE WITH AMINE AND ALCOHOL IN THE CO-PRESENCE OF SELENIUM AND TRIETHYLAMINE
Authors: Kondo Kiyoshi , Sonoda Noboru , Tsutsumi Shigeru
Published: July 2006

Carbamates have been synthesized conveniently by the reaction of carbon monoxide with amine and alcohol by the use of selenium and triethylamine under mild conditions.
THE STERIC EFFECT ON AN ADDITION REACTION OF α-HYDROXYALKYL RADICAL TO DIETHYL MALEATE AND DIETHYL FUMARATE
Authors: Tokuda Masao , Chung Vo Van , Suzuki Akira , Itoh Mitsuomi
Published: July 2006

Radiation-induced addition reaction of ethanol and 1-propanol to diethyl maleate gives predominantly cis-γ-alkyl substituted paraconate, but the addition to diethyl fumarate produces trans- and cis-paraconates in almost the same yield. These results can be rationalized by the steric hindrance between α-hydroxyalkyl radical and maleate or fumarate ester.
THE NATURE OF METHYL RADICALS ADSORBED ON AN ALUMINA SURFACE
Authors: Fujieda Shigeaki , Setaka Morio , Kwan Takao
Published: July 2006

ESR spectra were obtained with the methyl radical adsorbed on the surface of alumina. The nature of the motion of the radical was thought to be entirely different from those trapped on a silica gel surface or porous Vycor glass; the familiar quartet hf lines were replaced by a spectrum characterized with a sextet hf structure, suggesting that the three methyl protons were no longer equivalent at the surface of alumina.
PHOTOINDUCED REACTIONS. LXI. PHOTOCHEMICAL cis,trans-ISOMERIZATION OF 2,4,5-TRIPHENYLIMIDAZOLES
Authors: Matsuura Teruo , Ito Yoshikatsu
Published: July 2006

Irradiation of cis- (amarine) and trans- (isoamarine) 2,4,5-triphenylimidazolines in acetonitrile or benzene gave a photostationary mixture of cis- and trans-isomers. On irradiation in a dilute acetone solution, cis,trans-isomerization occurred only with isoamarine but not with amarine. In acetone, 2,4,5-triphenylimidazole was also formed. Two modes of mechanisms are proposed.
A NOVEL METHOD FOR THE PREPARATION OF THIOLSULFONATES
Authors: Abe Yasuo , Tsurugi Jitsuo
Published: July 2006

Thiolsulfonates were obtained in good yield by the reaction of N-(arylthio)-succinimides with alkali arenesulfinates and arenesulfinic acid.
LIQUID CRYSTALLINE PROPERTIES OP LATERALLY SUBSTITUTED BENZYLIDENEANILINE DERIVATIVES
Authors: Murase Kei
Published: July 2006

A new series of anils, N-(p-alkoxybenzylidene)-2-methyl-4-octyloxyanilines, has been synthesized and investigated for the liquid crystalline property. These compounds exhibit nematic behavior in relatively low temperature range and make a well known change of nematic–isotropic transition temperatures. No smectic phase appears even in the case of longer chain derivatives.
SOLUBILITY AND ENTROPY OF SOLUTION OF IODINE IN ETHANOL-CYCLOHEXANE SOLUTIONS
Authors: Nakanishi Koichiro , Asakura Soto
Published: July 2006

The solubility of iodine in ethanol-cyclohexane solutions has been measured at 15.0, 25.0 and 35.0°C and the entropy of solution has been evaluated. It is found that the iodine complex formed in the mixed solutions is more stable than that in pure ethanol.
SOLVOLYSIS OF cis- AND trans-CHRYSANTHEMYL 3,5-DINITROBENZOATES. THE CONJUGATIVE TRANSMISSION ABILITY OF CYCLOPROPANE RING
Authors: Sasaki Tadashi , Eguchi Shoji , Ohno Masatomi , Umemura Takeaki
Published: July 2006

The solvolysis of the titled compounds was investigated. The trans-isomer was solvolyzed 5.5 times faster than the cis-isomer at 100°C, but the product compositions were similar. From these results, cis- and trans-homopentadienyl cations were postulated as the intermediates.
A NEW SPECTROPHOTOMETRIC DETERMINATION OF ANTIMONY WITH SILVER-DIETHYLDITHIOCARBAMATE AND o-PHENANTHROLINE MIXTURE IN CHLOROFORM
Authors: Yamamoto Yuroku , Kanke Makoto , Mizukami Yaeko
Published: July 2006

Antimony(III) is spectrophotometrically determined by reaction between stibine and a mixture of silver diethyldithiocarbamate and o-phenanthroline in chloroform. The red color appears in the chloroform phase, and the color developement may be due to the formation of colloidal silver by reduction with stibine. The method is fairly sensitive and selective.
HOMOGENEOUS ISOMERIZATION AND HYDROGENATION OF 1-PENTENE CATALYZED BY PLATINUM COMPLEXES
Authors: Kushi Kenji , Kanai Hiroyoshi , Tarama Kimio , Yoshida Satohiro
Published: July 2006

Isomerization and hydrogenation reactions of 1-pentene were catalyzed by zerovalent Pt complex, Pt(Pph3)3, in the presence of SnCl2, oxygen, aldehyde, and [PtH(Pph3)3]X (X=HSO4, NO3, ClO4) under mild conditions.
ALOENIN, A NEW BITTER GLUCOSIDE FROM ALOE SPECIES
Authors: Suga Takayuki , Hirata Toshifumi , Odan Michiyo
Published: July 2006

A new bitter glucoside, named aloenin, isolated from Aloe species has been established to be 2-(carbomethoxymethyliden)-4-(β-d-glucopyranosyloxy)-7-hydroxy-5-methylchromene (1). This is an unique example of naturally occurring chromene having the carbomethoxymethylidene group on C-2.
PREPARATION AND ABSOLUTE CONFIGURATION OF l-TARTRATO-BIS(1,10-PHENANTHROLINE) COBALT(III) COMPLEXES
Authors: Tatehata Akira
Published: July 2006

Three complexes, Δ-,Λ-[Co(phen)2(l-tart)]+, and cis-[Co(phen)2(OH2)(l-tart)]+, have been separated by ion-exchange Sephadex and characterized using the CD data. Two methods, empirical and nonempirical, have been used to assign the absolute configurations.
ELECTROCHEMISTRY OF 9,10-DICHLOROANTHRACENE AT LOW TEMPERATURES
Authors: Matsumoto Tamotsu , Sato Masanori , Hirayama Satoshi
Published: July 2006

A preliminary electrochemical investigation of 9,10-dichloroanthracene in aprotic solvents was performed at low temperatures as low as −60°C. The generated anion was shown to be stabilized as the temperature decreased. The use of an optical transparent electrode enabled us to obtain a new relationship between absorbance of radical ion and electrode potential.
PHOTOLYSIS OF 3,4:6,7-DIBENZOBICYCLO[3.2.2]NONA-3,6,8-TRIENE SYSTEM
Authors: Murata Ichiro , Sugihara Yoshikazu
Published: July 2006

Photolysis of 3,4:6,7-dibenzobicyclo[3.2.2]nona-3,6,8-trien-2-one (3) afforded exclusively 3,4-benzo-4a,9a-dihydrofluorenone (5) by way of [1,3]-acyl migration. Compound (4), exomethylene counterpart of the ketone (3), was regiospecifically isomerized to (7) by both the direct and sensitized irradiations.
ESR SPECTRA OF RADICAL ANIONS OF CALICENE DERIVATIVES.—LINE WIDTH ALTERNATION DUE TO ADJACENT n-PROPYL GROUPS
Authors: Niizuma Shigeya , Konishi Shiro , Kokubun Hiroshi , Koizumi Masao
Published: July 2006

ESR spectra of radical anions from 1,2,3,4-tetrachloro-5,6-diphenylcalicene (PhC) and 1,2,3,4-tetrachloro-5,6-di-n-propylcalicene (PrC) were studied. An unpaired electron spin is localized on 5- and 6-carbon atoms and its substituents for both. PrC shows a typical line width alternation, which was explained by a hindered internal rotation (the three-membered and five-membered rings are not coplanar) of two n-propyl groups with a barrier of ∼1.5 kcal/mole.
GEOMETRICAL ISOMERS OF 2,4-DINITROPHENYLHYDRAZONES OF SOME BENZOPHENONES. ISOLATION AND THEIR CONFIGURATIONAL ASSIGNMENTS
Authors: Tabata Masayoshi , Yokota Kazuaki , Takada Yoshiyuki , Suzuki Akira
Published: July 2006

Geometrical isomers of 2,4-dinitrophenylhydrazones of asymmetrically substituted benzophenones were isolated in pure form by recrystallization. The configurational assignments to their E- and Z-isomers were made using electronic and NMR spectral data.
On the Configurational Stability of the Chiral Disilanyl Radical Derived from (−)-1-Methyl-1,2,2,2-tetraphenyldisilane
Authors: Sakurai Hideki , Murakami Masashi
Published: July 2006

A chiral disilanyl radical produced from (−)-1-methyl-1,2,2,2-tetraphenyldisilane, [α]D-8.9°, undergoes chlorine abstraction to give the corresponding chlorodisilane with retention of configuration but in low optical yield, contrary to the case of the previously-reported chiral monosilyl radical. Factors influential on the stereochemical course on these radicals are discussed.
PHOTOCHEMICAL REACTIONS BETWEEN DIBROMOMALEIC ANHYDRIDE AND BENZENE OR ITS HOMOLOGUES
Authors: Matsuo Taku , Tanoue Yutaka , Matsunaga Teruo , Nagatoshi Kikuo
Published: July 2006

On the irradiation of dibromomaleic anhydride in benzene or its substituted derivatives, α-aryl-α′-bromomaleic anhydrides were obtained. Further irradiation of the solution afforded phenan-threne-9,10-dicarboxylic anhydrides. In the first step, charge–transfer complexes also were found to participate in the reaction.
REACTIONS OF THE β-CIS ISOMERS OF ETHYLENEDIAMINE-N,N′-DIACETATO(ETHYLENEDIAMINE) COBALT(III) AND ETHYLENEDIAMINE-N,N′-DIACETATO(DIAMMINE) COBALT(III) COMPLEXES IN BASIC AQUEOUS SOLUTIONS
Authors: Kuroda Kashiro , Mohri Fumihito
Published: July 2006

Reactions of the β-cis isomers of ethylenediamine-N,N′-diacetato(ethylenediamine)cobalt(III) and ethylenediamine-N,N′-diacetato(diammine)cobalt(III) ions, β-cis-[Co(EDDA)(en)]+ and β-cis-(Co(EDDA)(NH3)2]+, have been examined in basic aqueous solutions. It has been found that, whereas the diammine complex hydrolyzes, the ethylenediamine complex isomerizes to the α-cis isomer. The routes of the reactions have been discussed.
PREPARATION AND PROPERTIES OF ORDERED PEROVSKITES (LaSr) (MnW)O6 AND (LaSr) (MgW)O6
Authors: Yoshimura Masahiro , Kamata Kiichiro , Nakamura Tetsuro
Published: July 2006

Ordered perovskites,(LaSr) (Mn2+W5+)O6 and (LaSr) (Mg2+W5+)O6, were newly prepared. The lattice constants,the electrical conductivities and the magnetic moments were studied. The results indicate that 3d5 electrons in Mn2+ are almost localized and that the interaction between Mn2+ and W5+ is fairly weak in this compound.
PHOTOCHEMICAL (2 + 2 + 2 + 2) CYCLOADDITION OF FURAN TO β-NAPHTHONITRILE
Authors: Sugioka Taizo , Pac Chyongjin , Sakurai Hiroshi
Published: July 2006

The photochemical reaction of β-naphthonitrile with furan affords a cage-adduct, 8-cyano-9,10-benzo-11-oxapentacyclo [4,2,2,1,2,50,3,80,4,7] undec-9-ene (I), in good yield.
THE STEREOCHEMISTRY OF THE INTERMEDIATE VINYL RADICAL IN THE RADICAL CYCLIZATION OF 1-ETHOXY-6-IODO-1-HEXYNE
Authors: Ohnuki Takashi , Yoshida Masayuki , Simamura Osamu
Published: July 2006

Reaction of 1-ethoxy-6-iodo-1-hexyne-3,3-d2 with tri-n-butyltin hydride in the presence of azobisisobutyronitrile gave chiefly (E)-2-ethoxymethylenecyclopentane-1,1-d2 by way of a radical cyclization. This fact demonstrates clearly that the radical addition took place to give an intermediate vinylic radical in a bent form, in which the half-filled sp2 hybrid orbital is disposed in the trans position with respect to the carbon group which has just added.
SELF-DIFFUSION COEFFICIENTS OF Tl AND Br IN TIBr SINGLE CRYSTAL
Authors: Khrihara Seiichi , Fueki Kazuo , Mukaibo Takashi
Published: July 2006

Self-diffusion coefficients of Tl and Br in TIBr single crystal were determined by the radioactive tracers and the serial sectioning technique. The results are as follows,

DTl*=(1.316±0.013)exp[−(27.44±0.55)⁄RT]cm2⁄sec (420–300°C)

DBr*=(1.227±0.013)×10−2exp[−(17.75±0.22)⁄RT]cm2⁄sec (420–250°C)

where the activation energy is expressed in unit of kcal/mol.
MAGNETIC INTERACTION IN THE SO-CALLED ZEROVALENT BERYLLIUM COMPLEX OF 2,2′-DlPYRIDYL, [Be(dipy)2]
Authors: Hara Ken-ichi , Inoue Motomichi , Kubo Masaji
Published: July 2006

The magnetic susceptibility and electronic absorption spectrum of [Be(dipy)2] indicate that two 2,2′-dipyridyl radical anions are coordinated to a divalent beryllium ion and that antiferromagnetic interaction (exchange integral, J/k = −11.6°K) operates between two radical ions within the molecule of [Be(dipy)2].
SYNTHETIC STUDIES OF CARBOHYDRATE DERIVATIVES WITH PHOTOCHEMICAL REACTION. IV. PHOTOCHEMICAL ADDITION REACTION OF SECONDARY ALCOHOLS TO METHYL 4,6-DI-O-ACETYL-2,3-DIDEOXY-α-d-erythro-HEX-2-ENOPYRANOSIDE
Authors: Matsuura Kazuo , Araki Younosuke , Ishido Yoshiharu , Satoh Shiro
Published: July 2006

Photochemical addition reaction of 2-propanol to methyl 4,6-di-O-acetyl-2,3-dideoxy-α-d-erythro-hex-2-enopyranoside was found to give methyl 4,6-di-O-acetyl-2,3-dideoxy-2-C-(1-hydroxy-1-methylethyl)-α-d-erythro-d-glycero-hexopyranoside in 66% yield. A series of secondary alcohols were also found to give such addition products in the photochemical reaction.
NOVEL TYPE OF REACTION OF HEXAMETHYLPHOSPHORIC TRIAMIDE WITH ALCOHOLS
Authors: Kawanisi Mituyosi , Arimatsu Seiji , Yamaguchi Ryohei , Kimoto Koichi
Published: July 2006

Upon being heated in HMPT, 1-adamantanol transformed into adamantane, whereas 2-adamantanol afforded 2-adamantyl tetramethylphosphorodiamidate. Diphenyl- and triphenyl-methyl alcohols were reduced into the corresponding hydrocarbons. Benzyl alcohol was found to give dibenzylmethylamine together with benzyldimethylamine.
POLYMERIZATION OF CYCLOPENTADIENE BY ACETYL PERCHLORATE
Authors: Kohjiya Shinzo , Yamashita Shinzo
Published: July 2006

Cationic polymerization of cyclopentadiene was carried out by acetyl perchlorate. The obtained value of the propagation rate constant for this system is equal to that of perchloric acid, which agrees well with the identity of counter ions (perchlorate anion) for both systems.
THE ABSORPTION OF CARBON MONOXIDE BY SILVER-COMPOUNDS
Authors: Souma Yoshie , Sano Hiroshi
Published: July 2006

Unstable carbonyl ion Ag(CO)n+ was prepared from Ag2O, Ag2SO4 or AgClO4 and carbon monoxide in H2SO4 or H2SO4–SO3 solution. The value of ″n″ was 0∼ 2.0 at −10∼30°C, under CO pressure of 1∼19 atm.
A NEW SYNTHESIS OF 2,5-DISUBSTITUTED TETRAZOLES VIA 1,5-DIPOLAR CYCLIZATION
Authors: Ito Suketaka , Tanaka Yumo , Kakehi Akikazu , Kondo Kenichi
Published: July 2006

2,5-isubstituted tetrazoles were obtained by the reaction of phenylsulfonylhydrazones of aromatic aldehydes with benzenediazonium salt in comparable yields. The reaction may proceed via the intramolecular cyclization of 1,5-dipoles generated from the formazans.
ORDERED AND DISORDERED HYDROGEN BONDS IN TIN(II) CHLORIDE DIHYDRATE FROM SINGLE CRYSTAL NEUTRON DIFFRACTION
Authors: Kiriyama Ryôiti , Kiriyama Hideko , Kitahama Katsuki , Nakamura Osamu
Published: July 2006

Single crystal neutron diffraction shows that the deuteron arrangements in SnCl2·2D2O are ordered and disordered, respectively, below and above Ttr. In the high temperature phase four deuterons of two non-equivalent water molecules distribute among seven sites with individual occupancy factors.
THE THERMAL DECOMPOSITION OF CH3NH2 IN SHOCK WAVES
Authors: Hidaka Yoshiaki , Saito Ko , Yamamura Hitoshi
Published: July 2006

The thermal decomposition of CH3NH2, diluted in Ar, has been studied behind reflected shock waves over the temperature range 1600 – 2100 K by the application of infrared emission techniques. It was found that apparent activation energy in the CH3NH2 decomposition was 38.6 kcal/mol.
KJELDAHL DIGESTION AS SILVER SALT OF CYANO COMPOUNDS
Authors: Shirai Michiko
Published: July 2006

Cyano nitrogen in inorganic compound was satisfactorily determined by precipitating cyanide or cyano complex ion with silver sulfate solution prior to Kjeldahl digestion.
PHOTO-SENSITIZED ISOMERIZATION OF 4-HOMOADAMANTENE IN PHOTIC MEDIA
Authors: Yamaguchi Ryohei , Arimatsu Seiji , Kawanisi Mituyosi
Published: July 2006

UV-irradiation of 4-homoadamantene (I) in acetic acid in the presence of BTX afforded 2,4-dehydrohomoadamantane (II), isomeric to I, together with 4-homoadamantyl and 3-homoadamantyl acetates (IIIa and IVa). Photo-isomerization of I into II was also observed with added catalytic amount of methanesulfonic acid.
PRESSURE EFFECT ON β RELAXATION PROCESS IN CHLORINATED POLYETHYLENE AND POLYVINYLACETATE
Authors: Naoki Motosuke , Kokubo Atsuro , Nose Takuhei
Published: July 2006

The β relaxation processes of chlorinated polyethylene vulcanizate (CPE) and polyvinylacetate(PVAc) were investigated by dielectricity in a frequency range of 30∼3×105 Hz, a temperature range of −50∼20 °C and a pressure range of 1∼600 Kg/cm2. Both superpositions on temperature and pressure were possible for CPE, but not for PVAc, and the behaviors of the activation volume ΔV≠ in CPE and PVAc were significantly different from each other.
STUDIES OF SALT SOLUTION AEROSOLS. XI. THE COAGULATION RATE OF AN AQUEOUS SALT SOLUTION AEROSOL OF SODIUM SULFATE AND ITS APPLICATION TO THE ESTIMATE OF THE STABILITY OF AEROSOLS
Authors: Ueno Yasuo , Sano Isamu
Published: July 2006

The coagulation rate of an aqueous salt solution aerosol of Na2SO4 has been determined in terms of number and mass concentration under various conditions, with the finding that the rate constant in mass concentration might be useful as a measure of coagulation rate. Some examples of its application are described in detail.
THE INTERACTION OF p-DINITROBENZENE WITH SODIUM HYDROXIDE IN AQUEOUS DIMETHYL SULFOXIDE
Authors: Abe Takehiro
Published: July 2006

The interaction of p-dinitrobenzene with hydroxide ion in aqueous dimethyl sulfoxide was studied by visible spectroscopy. The formation of the p-dinitrobenzene anion-radical was initially found. From the time-dependence of the radical, the radical seems to be a precursor in the displacement of one nitro group.
FORMATION OF RADICAL CATIONS FROM 1,4-DIALKOXYBENZENES IN NITRO COMPOUNDS IN THE PRESENCE OF AlCl3
Authors: Niskenaga Akira , Hayashi Hidetoshi , Matsuura Teruo
Published: July 2006

The electron transfer from 1,4-dialkoxybenzenes giving rise to the corresponding radical cations takes place not only in nitromethane but also in other nitro compounds, aliphatic and aromatic one, in the presence of AlCl3 or BF3. The reaction is reversible and affected by substitution and concentration of the 1,4-dialkoxybenzenes and nature of the nitro compounds. (RNO2)2AlCl2+ may be suggested to be the electron acceptor in the system.
THE CHLOROPHOSPHONATION OF TOLUENE AND p-XYLENE
Authors: Okada Toshihiro , Okamoto Yoshiki , Sakurai Hiroshi
Published: July 2006

In the chlorophosphonation of toluene and p-xylene, tolylphenylmethanes (I) and 2,4′,5-trimethyldiphenylmethane (II) were obtained as major products in addition of benzyl- (III) and p-methylbenzylphosphonic dichloride (IV). I and II may be formed by benzylation of toluene or p-xylene with benzyl cation, resulted from electron transfer from benzyl radical to phosphorus trichloride.
METASTABLE CRYSTAL IN THIN FILMS OF MALEIC ACID ON METAL SURFACES
Authors: Suzuki Koichi , Hatta Aritada , Suëtaka Wataru
Published: July 2006

Infrared spectra of thin maleic acid films formed on metal surfaces by vacuum deposition showed that the crystal structure in the thin films changes depending upon the condition of the metal surface. The films grown on fresh surfaces had a metastable crystal structure, in which hydrogen bonds are weaker than in the ordinary crystal.
A CONVENIENT PREPARATIVE METHOD OF α-CHLORO KETONES
Authors: Kuwajima Isao , Shinozaki Hiraku , Hayakawa Susumu
Published: July 2006

Rearrangement reaction of 1-substituted 2,2-dichloroethanol has been studied and it has been found that the corresponding α-chloro ketone is obtained in good to excellent yield by treating the alcohol with 2∼3 equivalents of n-butyllithium in dimethoxyethane.
ROLE OF THE PARTIALLY-OCCUPIED d-ORBITALS OF PHOSPHONIUM COMPOUNDS IN THE CATALYTIC ACTIVATION OF MOLECULAR OXYGEN IN LIQUID-PHASE OXIDATION
Authors: Ohkubo Katsutoshi , Sakamoto Hiroyuki
Published: July 2006

The catalytic activation of the ground state 3Σg− O2 by phosphonium compounds in the liquid-phase oxidation of hydrocarbons was demonstrated on the basis of ultraviolet spectroscopic measurements and ASMO-SCF calculations. The said compounds, namely, activate the 3Σg− O2 mainly by the aid of the electron-transfer from the partially-occupied phosphorus dx2–y2-orbital of the formers to the 1πg-orbitals of the latter through the favorable d-π orbital-overlaps.
AN INVERSION OF THREONINE TO ALLOTHREONINE IN THE N,O-MIGRATION REACTION OF THREONINE PEPTIDES IN CONCENTRATED SULFURIC ACID
Authors: Wakamiya Tateaki , Tarumi Yuzo , Shiba Tetsuo
Published: July 2006

In a N,O-migration reaction of peptides containing β-hydroxy-α-amino acids in strong acids, it was generally accepted that the configuration on β-carbon atom is retained through the reaction. However, according to our recent investigation using concentrated sulfuric acid as strong acid, a configurational change was observed in the migration reaction. Thus, the threonine residue in peptides was converted to allothreonine residue on the reaction. For the migration reaction accompanying an inversion of configuration, we suggested the mechanism involving SN2 elimination of O-sulfate of threonine residue.
SALTING-OUT EFFECT IN SOLVENT EXTRACTION(I) SPECTROPHOTOMETRIC DETERMINATION OF IRON(III) WITH 2-THENOYLTRIFLUOROACETONE
Authors: Kawamoto Hiroshi , Akaiwa Hideo
Published: July 2006

A new solvent extraction technique using salting-out effect is described and shown to be applicable to the rapid and selective determination of iron(III).
A CONVENIENT METHOD FOR THE HYDROLYSIS OF VINYL CHLORIDES TO KETONES
Authors: Mukaiyama Teruaki , Imamoto Tsuneo , Kobayashi Susumu
Published: July 2006

A new and useful method for the hydrolysis of vinyl chlorides was investigated by the use of EtSH and TiCl4. Various vinyl chlorides, such as α-chlorostilbene, 1,3-diphenyl-1-chloro-1-propene and 2,6-dimethyl-4-chloro-3-heptene, were hydrolyzed to corresponding ketones in good yields at room temperature.
SELECTIVE FORMATION OF METHYL VINYL KETONE FROM ACETONE AND METHANOL WITH SILICA-MAGNESIA BASE CATALYST
Authors: Okada Masahide , Asami Yukio
Published: July 2006

Silica-magnesia was examined as catalyst for the said reaction and was found to give nearly 100% selectivity. Loading of Ag as well as MnO2 resulted in an increase of the activity of the catalyst but was not detrimental to the selectivity. The course of the reaction was briefly discussed.
A NOVEL CATALYST SYSTEM FOR THE ULLMANN CONDENSATION IN AQUEOUS SOLUTION. REACTION OF A HALOGENOANTHRAQUINONE WITH ANILINE
Authors: Tuong Tran Dinh , Hida Mitsuhiko
Published: July 2006

The yield of the Ullmann condensation of sodium 1-amino-4-bromoanthraquinone-2-sulfonate with aniline in an alkaline aqueous solution was improved markedly by using the system [Cu2+ + metal reducing agent (such as Fe2+, Ti3+, Sn2+)] compared with the conventional procedures using only copper(Cu2+ or Cu+) salts.
THE EFFECT OF TRIPHENYLPHOSPHINE ON THE HYDROGENATION REACTION OF BIS(DIMETHYLGLYOXIMATO)COBALT(II)
Authors: Yamaguchi Tatsuaki , Tsumura Touru
Published: July 2006

The present study relates to the influence of the axial bases, especially triphenylphosphine, on the catalytic hydrogenation reaction of bis(dimethylglyoximato)cobalt(II). It was established by the kinetical study that an excess triphenylphosphine acts as a poison for this reaction by the formation of 1:2 adduct.
TRIPLET EXCITON MIGRATION IN POLY-N-VINYLCARBAZOLE AND ITS STYRENE COPOLYMERS
Authors: Yokoyama Masaaki , Nakano Takeshi , Tamamura Toshiaki , Mikawa Hiroshi
Published: July 2006

Delayed emission spectra of poly-N-vinylcarbazole and its styrene copolymers in a rigid glass have been measured at 77°K. New observations of delayed fluorescence and phosphorescence of poly-N-vinylcarbazole have been obtained. Delayed fluorescence due to triplet–triplet annihilation resulting from intramolecular migration of triplet excitons exhibits more sensitive dependence on the length of N-vinylcarbazole unit sequence than the kind of end groups. This fact is supported by the experiments on N-vinylcarbazole-styrene copolymers.