bluuebunny/crossref_metadata_2025 huggingface dataset:
Chloroperoxidase Catalyzed Halogenation of Pyrimidine Bases
Authors: Itahara Toshio , Ide Naoko
Published: July 2006

Treatment of uracil or cytosine with H2O2 and potassium halides in the presence of chloroperoxidase in potassium phosphate buffer solution at pH 3.0 resulted in halogenation of the substrates, whereas no reaction occurred on thymine by a similar treatment.
Preparation and Properties of Magnetically-interacting Polymer with Cupper(II) and Vanadyl(II) Poporphyrins
Authors: Kamachi Mikiharu , Cheng Xian Su , Aota Hiroyuki , Mori Wasuke , Kishita Michihiko
Published: July 2006

Polyacrylate having tetraphenylporphinatocupper(II) and tetraphenylporphinatovanadyl(II) in its side chains (Cu : V = 1 : 1.2) has been prepared by the radical copolymerization of the corresponding acrylates. The temperature dependence of its magnetic susceptibility indicates the existence of ferromagnetic interaction.
57Fe-Moessbauer Spectroscopic Studies on the Products of [1.1]Ferrocenophane-1,12-dione with I2, Br2, and DDQ
Authors: Watanabe Masanobu , Masuda Yuichi , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

[1.1]Ferrocenophane-1,12-dione reacts with I2 and DDQ giving a diamagnetic [1.1]ferrocenophane-I2 and DDQ adduct and reacts with Br2 giving a paramagnetic [1.1]ferrocenophanium-1,12-dione+ Br3− salt. The results of 57Fe-Moessbauer spectroscopy and other physicochemical measurements of the reaction products indicate that the formers are an I2 and a DDQ molecular complex, while the latter is a trapped-valence type mixed-valence salt.
Synthesis of Dehydroisoerivanin, Isoerivanin, Ludovicin C, and 1α,3α-Dihydroxyarbusculin B Utilizing the Organoselenium-mediated Reduction of Epoxy Ketone
Authors: Miyashita Masaaki , Suzuki Toshio , Yoshikoshi Akira
Published: July 2006

Short step synthesis of dehydroisoerivanin, isoerivanin, ludovicin C, and 1α,3α-dihydroxyarbusculin B have been achieved by employing the organoselenium-mediated reduction of α,β-epoxy ketone as the key step.
Syntheses and Physical Properties of Tetrakis(methylthio)tetraselenafulvalene (TTC1-TSeF) and Tetrakis(methylseleno)tetraselenafulvalene (TSeC1-TSeF)
Authors: Iwasawa Naoko , Saito Gunzi , Imaeda Kenichi , Mori Takehiko , Inokuchi Hiroo
Published: July 2006

The synthesis of tetrakis(methylthio)tetraselenafulvalene (TTC1-TSeF) by a convenient one-pot reaction using dimethyldisulfide is reported for the first time as well as that of tetrakis(methylseleno)tetraselenafulvalene (TSeC1-TSeF). The physical properties and lattice constants of these compounds are compared with those of TYC1-TTF (Y = sulfur, selenium, and tellurium). TTC1-TSeF is considered to have the smallest on-site Coulomb repulsive energy among these five compounds.
Enantioselective Addition of Diethylzinc to Aldehydes Catalized by Chiral Diamino-diols Derived from Ephedrine
Authors: Soai Kenso , Nishi Mitsugu , Ito Yuhki
Published: July 2006

Dilithium salts of chiral diamino-diols possessing C2 axis derived from ephedrine catalyzed the enantioselective addition of diethylzinc to aldehydes to afford optically active sec-alcohols in up to 85% enantiomeric excess(e.e.).
Photoaddition of Olefins to Quinolin-, Isoquinolin-, and Phthalazin-thione Systems
Authors: Sato Eisuke , Ikeda Yoshiya , Kanaoka Yuichi
Published: July 2006

Irradiation of quinolin-2-, isoquinolin-1-, and phthalazin-1-thiones with olefins afforded photoaddition products: substituted quinolines, isoquinolines and phthalazines at the thiocarbonyl carbon. A new addition-cyclization was found producing tricyclic thiopyrano-isoquinolines and -phthalazines.
Synthesis and Characterization of a Dinuclear Manganese(II,III) Mixed Valence Complex with the Dinucleating Ligand, L-py, 2,6-Bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol
Authors: Suzuki Masatatsu , Murata Shuji , Uehara Akira , Kida Sigeo
Published: July 2006

A novel dinuclear manganese(II,III) mixed valence complex, [Mn2(L-py)(CH3COO)2](ClO4)2·H2O, was prepared by reaction of equimolar amounts of Mn(ClO4)2·6H2O and [Mn(dmso)6](ClO4)3 with HL-py, CH3COOH and (C2H5)3N in methanol, where HL-py represents 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol. Cyclic voltammogram in acetonitrile showed two quasi reversible waves at 0.47 V and 1.02 V (vs. SCE), which are assigned to the redox reactions of Mn(II,III)/Mn(II,II) and Mn(III,III)/Mn(II,III), respectively.
Convenient Reduction of C–C Multiple Bonds Conjugated with Aromatic Rings by PhYbI Complex or Yb Metal
Authors: Hou Zhaomin , Taniguchi Hiroshi , Fujiwara Yuzo
Published: July 2006

A variety of C–C multiple bonds conjugated with aromatic rings are smoothly reduced by the PhYbI/MeOH or Yb/MeOH systems under very mild conditions to give the corresponding saturated products in excellent yields. This reaction provides a novel convenient method for reduction of multiple bonds conjugated with aromatic rings.
57Fe-Moessbauer Spectroscopic Studies of the Reaction Products of Binuclear Metallocenes with Iodine
Authors: Watanabe Masanobu , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

A dark red colored stable diamagnetic adduct of biruthenocene with iodine can be prepared by treating biruthenocene with iodine in a dry benzene-hexane mixture. A less stable diamagnetic adduct of ferrocenylruthenocene with iodine can also be obtained. 1H-NMR and 57Fe-Moessbauer spectroscopic studies of the adducts suggest the presence of a direct interaction between Ru and I atoms in the adducts. Ferrocenylruthenocenylmethane gave iodoruthenocenylmethylene-ferrocenium triiodide.
1,4,5,8-Tetrachalcogeno-2,3,6,7-tetramethylnaphthalenes as New Electron Donors
Authors: Otsubo Tetsuo , Sukenobe Nobuo , Aso Yoshio , Ogura Fumio
Published: July 2006

The title compounds have been prepared with a view of developing new electron donors for low-dimensional molecular complexes. They have increasing donor character in order of the chalcogen triad, i.e., S, Se, Te, and all form semi-conductive complexes with TCNQ.
Structure of Isoamericanin A, a Prostaglandin I2 Inducer, Isolated from the Seeds of Phytolacca americana L.
Authors: Hasegawa Takashi , Fukuyama Yoshiyasu , Koshino Kazuyo , Nakagawa Kazuyuki , Tori Motoo , Asakawa Yoshinori
Published: July 2006

A new neo-lignan, isoamericanin A was isolated as a prostaglandin I2 inducer from the seeds of Phytolacca americana L. and its structure was fully characterized by extensive 2D NMR and long range selective proton decoupling (LSPD) techniques.
Reactions of Stable Wittig Reagents with Episulfides
Authors: Okuma Kentaro , Yamasaki Yusuke , Komiya Takashi , Kodera Yasushi , Ohta Hiroshi
Published: July 2006

Stable Wittig reagents effectively reacted with episulfides to afford dialkyl fumarates and dialkyl maleates in good yields. The reaction probably occurred via attack of the ylide carbanion on episulfide’s sulfur to form a thiocarbonyl intermediate. The ylide further attacked this thiocarbonyl intermediate to give the final olefins.
A New Synthesis of 3-Hydroxy-2,5-dialkyl-1,4-benzoquinones Using Iodine-Copper(II) Acetate
Authors: Horiuchi C Akira , Suzuki Yasuto , Takahashi Masaaki , Satoh J Yasuo
Published: July 2006

Reactions of diosphenol and 3,6-dimethyl-1,2-cyclohexanedione with iodine-copper(II) acetate in acetic acid-water (5:1) at 80 °C gave the respective 3-hydroxy-2,5-dialkyl-1,4-benzoquinone in 25–80% yields. 2-t-Butyl-5-methylcyclohexanone similarly gave the corresponding 3-hydroxy-1,4-benzoquinone in 66% yield.
Thermodynamics of Tetrahedral-Octahedral Configurational Interconversions in Co(II) Complexes. The Ligand Substitution Reaction between Tetrahedral [Co(hmpa)4]2+ Ion and L (L = FA, NMF, DMF, DEF, or DMSO) in Nitromethane
Authors: Abe Yuriko , Morikawa Makiko , Wada Goro
Published: July 2006

Tetrahedral [Co(hmpa)4]2+ ion undergoes a single step reaction with L (L=FA, NMF, DMF, DEF, or DMSO) to form an octahedral [Co(hmpa)2L4]2+ ion in nitromethane. The temperature dependences of the equilibrium constants of tetrahedral-octahedral configurational interconversions exhibit similar values of ΔH=−30–−33 kJ mol−1 and ΔS=−115–−149 J mol−1 K−1 respectively except for larger values for the DMSO complex.
Photochemical Reaction of Furocoumarin (Psoralen). The Reactive Site in Its Photoexcited State
Authors: Otsuki Tetsuo
Published: July 2006

The 3,4-double bond of photoexcited furocoumarin shows a higher reactivity than the 4′,5′-double bond toward simple olefins, leading to the formation of cyclobutane derivatives.
Silver(I)-Catalyzed Isomerization of Quadricyclanes to Norbornadienes in Methanol
Authors: Maruyama Kazuhiro , Tamiaki Hitoshi
Published: July 2006

In methanol, quadricyclanes isomerized to norbornadienes by the catalytic action of silver(I), and methanol added to quadricyclanes by the action of proton. It was first confirmed that silver(I) was the real active species in the isomerization.
A Versatile New Reagent [Ph3GeCH2COGePh3] as Acetate Equivalent. BF3·OEt2 Mediated Aldol Reaction
Authors: Kiyooka Syun-ichi , Shiota Fuminori , Shibuya Tsutomu
Published: July 2006

Triphenylgermylacetyltriphenylgermane, Ph3GeCH2COGePh3, with aldehydes has been found to afford the corresponding aldol products in the presence of boron trifluoride etherate in good yields.
Preparation of a Yellow Heteropoly Molybdosulfate
Authors: Hori Toshitaka , Himeno Sadayuki
Published: July 2006

By heating the Na2MoO4·2H2O/H2SO4 system in the presence of acetonitrile (AN) as an auxiliary solvent, a yellow molybdosulfate complex was formed. The complex was isolated as tetraalkylammonium salts, and the Mo/S ratio was found to be close to 9. The IR and UV spectroscopic characteristics and some chemical properties were elucidated.
Xylene Bis(diethyldithiocarbamate) as a Neutral Carrier for Copper(II)-Selective Membrane Electrode
Authors: Kamata Satsuo , Ogawa Fumiuki , Fukumoto Masaomi
Published: July 2006

Polyvinyl chloride (PVC) membrane electrode based on o-xylene bis(diethyldithiocarbamate) which was newly synthesized as a neutral carrier, exhibits a Nernstian behavior to copper(II) ion for activity range of 10−1 M to 10−5 M. The electrode has given good response for the time and selectivity.
Oxidation Behavior of Vanadyl Pyrophosphate as a n-Butane Oxidation Catalyst
Authors: Matsuura Ikuya , Yoshida Kiyomi , Mori Atsuhito
Published: July 2006

(VO)2P2O7 is oxidized to β-VOPO4 via β′-phase (d = 4.87, 4.23, 3.19, 2.64 Å) which was probably a phosphate such as VPO4.75 containing vanadium in the average oxidation state of + 4.5. However, when excess phosphorus is present in (VO)2P2O7, oxidation stops at the stage of β′-phase. This suggests that the new phase, β′-VPO4.75, is a selective catalyst for n-butane oxidation to maleic anhydride.
Synthesis of Ammonia with RF Discharge. Adsorption of Products on Zeolite
Authors: Uyama Haruo , Uchikura Takeshi , Niijima Hideaki , Matsumoto Osamu
Published: July 2006

The adsorption of nitrogen-hydrogen molecules formed in the RF discharge on zeolite was studied. The ammonia molecules adsorbed on zeolite as ammonium ions were detected by IR spectroscopy and TPD. The present results obtained show that the ammonia synthesis is facilitated by the surface reactions of the NHx (x=1,2) radicals adsorbed on zeolite with hydrogen atoms.
Synthesis of Novel 4,6-Diazaspiro[2.3]hex-1-en-5-ones by the Reaction of Diphenylcyclopropenone Oxime with Isocyanates
Authors: Yoshida Hiroshi , Ohtsuka Hideki , Ogata Tsuyoshi , Matsumoto Kiyoshi
Published: July 2006

Diphenylcyclopropenone oxime hydrochloride (3) was prepared in an 83% yield from diphenylcyclopropenone and hydroxylamine hydrochloride in methanol. The salt 3 reacted with alkyl and aryl isocyanates in the presence of triethylamine to yield 1:2 addition products diazaspiro[2.3]hexenones in good yields.
Effect of Allyl Alcohol on Reduction of β-Keto Esters by Bakers’ Yeast
Authors: Nakamura Kaoru , Inoue Kiyoko , Ushio Kazutoshi , Oka Shinzaburo , Ohno Atsuyoshi
Published: July 2006

Stereochemical course of the reduction of β-keto esters by bakers’ yeast was controlled by treating the reduction systems with allyl alcohol.
Silicon Nitride Carbide Fiber from Spinnable Polymethylsilazanes
Authors: Nakaido Yasuaki , Otani Yo , Kozakai Noriyuki , Otani Sugio
Published: July 2006

Silicon nitride carbide fiber was prepared from polymethylsilazanes comprizing binary components. The gelatinous polymethylsilazanes obtained from the binary system consisting of commercially available methyltrichlorosilane and dimethyldichlorosilane were remarkably suitable precursors to make the amorphous ceramic fibers.
Synthesis of Heterosteroids. The First Synthesis of 11-Thiasteroids and a New Synthesis of 11-Oxasteroids
Authors: Suginome Hiroshi , Wang Jian Bo , Yamada Shinji
Published: July 2006

We report the syntheses of 3α-hydroxy-11-thia-5β,9β-pregnane, the first 11-thiasteroid, and 3α-hydroxy-11-oxa-5β-pregnane by the replacement of the 11-carbonyl group of 3α-hydroxy-5β-pregnane-11,20-dione acetate by a sulphur or an oxygen atom.
New Possibilities in the Michael Reaction by the Use of Tin(II) Enolates
Authors: Yura Takeshi , Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

The Michael addition reaction of tin(II) enolates with α,β-unsaturated ketones proceeds smoothly by the use of chlorotrimethylsilane as an activator to give the corresponding addition products in good yields.
High-pressure Ammonolysis of Lactones to Hydroxyamides
Authors: Matsumoto Kiyoshi , Hashimoto Shiro , Okamoto Tadashi , Otani Shinichi , Hayami Jun’ichi
Published: July 2006

The preparation of hydroxyamides from a variety of lactones and amines has been achieved at 9 kbar and 30 °C or 65 °C. The yields of hydroxyamides were excellent to moderate.
A Short, Efficient, Stereoselective Synthesis of Functionalized Cyclopropanes through the Cyclization of N-Phenyl-3-phenylthio-2-(phenylthiomethyl)propanamide
Authors: Tanaka Kazuhiko , Minami Keizaburo , Kaji Aritsune
Published: July 2006

Treatment of N-phenyl-3-phenylthio-2-(phenylthiomethyl)propanamide with 3.3 equiv. of butyllithium in THF-TMEDA produced a new dianion of 2-(phenylthio)cyclopropanecarboxamide which could react with a variety of electrophiles to give cyclopropanes with high stereoselectivity.
A Twisted and Partially Overlapping Porphyrin Dimer as a New Model of Special Pair in Photosynthetic Reaction Center
Authors: Osuka Atsuhiro , Maruyama Kazuhiro
Published: July 2006

A twisted and partially overlapping porphyrin dimer bridged by a 1,1′-spirobiindane spacer was synthesized. Its biszinc complex and bismagnesium complex showed a split Soret band, indicating the exciton interaction of the two porphyrin ring. Bismagnesium complex underwent reversible one-electron oxidation 40 mV more easily than the corresponding monomeric porphyrin.
New Method for the Synthesis of Podoblastin Derivatives and 3-Acyltetronic Acids
Authors: Kawakami Hiroshi , Hirokawa Shinya , Asaoka Morio , Takei Hisashi
Published: July 2006

A new and general method for the synthesis of podoblastin derivatives and 3-acyltetronic acids via isoxazoles is described. The key isoxazole intermediates were obtained by 1,3-dipolar cycloaddition reaction of acetylenecarboxylic acid derivatives to nitrile oxides. These isoxazoles were readily converted to the title compounds by hydrogenolysis followed by hydrolysis and cyclization.
Regioselective Synthesis of Terminal Olefins from Alkanes via Rhodium-Catalyzed C–H Activation
Authors: Sakakura Toshiyasu , Hayashi Teruyuki , Tanaka Masato
Published: July 2006

Pentane and decane were regioselectively transformed into 1-butene and 1-nonene with the simultaneous formation of acetaldehyde by photocatalysis in the presence of RhCl (CO)(PMe3)2 under carbon monoxide.
An EPR Study of a Model System for the Initial Oxygen Activation Process Caused by Adriamycin-Iron System
Authors: Tachibana Masahiko , Tero-Kubota Shozo , Iwaizumi Masamoto
Published: July 2006

1,4-Dihydroxyanthraquinone, a model compound for Adriamycin, is reduced by Fe2+-ADP complex to generate semiquinone, while by Fe2+-phosphate complex to hydroquinone. The difference is explained in terms of the higher redox potential of the latter reducing agent. Similar reduction reactions were observed in the case of the drug.
Highly Regioselective Addition of Allylstannanes to Vinyl Epoxides by Lewis Acid Mediation
Authors: Naruta Yoshinori , Maruyama Kazuhiro
Published: July 2006

In the presence of BF3·OEt2, reaction of allylstannanes with vinyl epoxides gives 1,2 or 1,4 addition products in good yield, depending on the substitution at the olefinic terminus. In either case regioselectivity is extremely high. The 1,2 adduct is applied to the elongation of a prenyl unit in polyprenyl compounds.
Giant Helical Superstructures Formed by Cationic Cholesterol-Containing Polymers
Authors: Cho Iwhan , Park Jae-Geun
Published: July 2006

Giant fibrous right-handed helical superstructures were formed in aqueous solution by a cholesterol-containing polymeric amphiphile, poly(CHODAMA-5). The ordered packing of tubular structures formed by vesicle-fusion mechanism is considered to be prerequisite for the formation of these giant superstructures. The vesicle-fusion was controlled by addition of Ca2+ and/or with aging time control at phase transition temperature.
Novel Photochemical Reactions of Dibenzodisilacyclohexadiene with Ketones
Authors: Sakurai Hideki , Sakamoto Kenkichi , Kira Mitsuo
Published: July 2006

Dibenzodisilacyclohexadiene reacts with ketones and formaldehyde, under photolytic conditions, to give a variety of products depending on the nature of the ketones used. A compound having 2-sila-3-oxabicyclo[3.2.2]nona-6,8-diene structure was isolated as a result of intramolecular trapping of a cyclohexadienyl radical.
Addition of Alcohol to Olefinic Bonds by Paired Electrosynthesis with Raney-Nickel Cathode
Authors: Yamada Tsukasa , Osa Tetsuo , Matsue Tomokazu
Published: July 2006

A one-pot addition reaction of an alcohol to an olefinic double bond was successfully performed by use of paired electrosynthesis with a Raney-nickel cathode.
Effect of Hydrophobic Group on the Structure of Langmuir–Blodgett Films of Amphiphilic Cyanine and Squarylium Dyes
Authors: Matsumoto Mutsuyoshi , Sekiguchi Tatsuo , Tanaka Hideaki , Tanaka Motoo , Nakamura Takayoshi , Tachibana Hiroaki , Manda Eiichiro , Kawabata Yasujiro
Published: July 2006

Phenylcyclohexyl group, a mesogenic unit, was introduced into the hydrophobic part of the amphiphilic cyanine and squarylium dyes. Surface pressure-area isotherms were explained in terms of the bulkiness and the stronger dispersion force of the mesogenic unit. In-plane anisotropy was observed for mixed LB films of the amphiphilic cyanine dye containing the mesogenic unit.
Novel Stationary Phases for Affinity Chromatography. Nucleobase-Selective Recognition of Nucleosides and Nucleotides on Poly(9-vinyladenine)-Supported Silica Gel
Authors: Akashi Mitsum , Yamaguchi Michiko , Miyata Hiroshi , Hayashi Mamiko , Yashima Eiji , Miyauchi Noriyuki
Published: July 2006

Poly(9-vinyladenine) (PVAd) was immobilized or coated on macroporous silica gel to be used as a stationary phase for HPLAC of nucleosides and nucleotides. The stationary phases showed nucleobase-selective recognition ability for nucleic acid constituents and gave practically useful HPLAC columns. On the basis of the results, the relationships between separation ability and the structure of PVAd are discussed.
Preparation of Highly Oriented Poly(p-phenylenevinylene) Thin Film by Using Langmuir–Blodgett Technique
Authors: Era Masanao , Shinozaki Hiroki , Tokito Shizuo , Tsutsui Tetsuo , Saito Shogo
Published: July 2006

Precursor polyelectrolyte of poly(p-phenylenevinylene) with bilayer-forming amphiphile as counterion forms a stable monolayer at the air–water interface. The monolayers could be transferred on substrates by Langmuir–Blodgett (LB) technique. A poly(p-phenylenevinylene) LB film could be obtained from heat treatment of the precursor LB film. Planar orientation of π-conjugated phenylenevinylene sequences was exhibited in the LB films.
Total Synthesis of (+)-Goniothalenol [(+)-Altholactone], a Novel Bioactive Tetrahydrofurano-2-pyrone
Authors: Tadano Kin-ichi , Ueno Yoshihide , Ogawa Seiichiro
Published: July 2006

A novel plant-origin tetrahydrofurano-2-pyrone, (+)-goniothalenol has been synthesized from l-arabinose. The central feature of the present synthesis is a silica-gel catalyzed intramolecular epoxy ring opening by hydroxyl group for construction of the tetrahydrofuran in the title compound.
A Short Step Synthesis of AV-toxin D
Authors: Kajimoto Tetsuya , Yahiro Kiyoshi , Nohara Toshihiro
Published: July 2006

AV-toxin D(1) is the most active phytotoxic component among AV-toxins isolated from the cultural medium of Acrospermum viticola which cause the zonate leave spot disease, and is the sole natural product having methoxy groups on phenoxazone skeleton. By using the nitrene annulation reaction, we succeeded in the short step synthesis of 1.
Sulfur Dioxide Gas Detection Using a Na2SO4–Y2(SO4)3–V2O5–SiO2 Solid Electrolyte
Authors: Imanaka Nobuhito , Kawai Kenji , Shiokawa Jiro , Adachi Gin-ya
Published: July 2006

The title solid electrolyte was examined for the SO2 detection. Vanadium pentoxide was mixed into the solid electrolyte for the purpose of replacement of Pt catalyst. The sulfate-based solid electrolyte contains Na2SO4–I phase which is effective for Na+ ionic conduction and shows 5–9 times as high conductivity as pure Na2SO4. By constructing an SO2 gas concentration cell with the use of NiSO4–NiO as a reference electrode, the electrolyte can detect the SO2 gas from 30ppm to 1% without the Pt catalyst.
Bulk Superconductivity in (BEDT-TTF)2[Cu(NCS)2]
Authors: Sugano Tadashi , Terui Kenji , Mino Shinji , Nozawa Kiyokazu , Urayama Hatsumi , Yamochi Hideki , Saito Gunzi , Kinoshita Minoru
Published: July 2006

The diamagnetic shielding is observed for an ambient-pressure organic superconductor (BEDT-TTF)2[Cu(NCS)2] by means of a.c. susceptibility measurements. The diamagnetic susceptibility amounts to 100 ± 5% of the perfect diamagnetism below 7 K and exhibits a sharp transition at 10.3 ± 0.4 K. The thermodynamical critical field is estimated and discussed in terms of the BCS theory.
Baker’s Yeast Reduction of 1,2-Diketones. Preparation of Pure (S)-(−)-2-Hydroxy-1-phenyl-1-propanone
Authors: Chênevert Robert , Thiboutot Sonia
Published: July 2006

1,2-Diketones are readily reduced by fermenting baker’s yeast but the reactions proceed with little selectivity. One notable exception is the reduction of 1-phenyl-1,2-propanedione which affords pure (S)-(−)-2-hydroxy-1-phenyl-1-propanone in good yield.
Structures of Metasequoic Acid A and B
Authors: Sakan Fujio , Iwashita Takashi , Hamanaka Nobuyuki
Published: July 2006

Two new antifungal diterpenes, metasequoic acid A(4) and B(5) were isolated from Metasequoia glyptostroboides Hu et Cheng. These compounds possess a new skeleton which contains a cyclopropane ring bridging C-3 and C-4 of the labdane framework. The structures 4 and 5 have been determined by spectroscopic methods.
Digital Simulation of Normal Pulse Polarographic Adsorption Waves of Methyl Viologen
Authors: Kobayashi Katsuyoshi
Published: July 2006

Digital simulations of the normal pulse polarographic adsorption waves of the nernstian redox species obeying the Frumkin type Flory–Huggins isotherm interpret the unusual electrochemical behavior of methyl viologen. An orientation change of the adsorbed reductant causes a marked positive shift of adsorption waves.
Thiuram Monosulfides as a Neutral Carrier for Copper(II)-Selective Membrane Electrode
Authors: Kamata Satsuo , Bhale Ajay , Uda Takaharu
Published: July 2006

Poly(vinyl chloride) membrane electrodes that are sensitive and selective to copper(II) ion were developed. The electrodes based on tetramethyl, tetraethyl and dipyrrolidine thiuram monosulfides as a neutral carrier, exhibit a Nernstian behavior to copper(II) ion in the activity range of 10−1 M to 10−6 M–10−8 M. Properties of the electrodes are briefly discussed.
Rheological Effect of Excess Polymer on Latex Suspension
Authors: Nashima Takeshi , Furusawa Kunio
Published: July 2006

Effects of free polymers (Hydroxy–Propyl–Cellulose (HPC)) on the flocculation/dispersion feature of latex dispersions stabilized sterically by the same HPC at its lower critical solution temperature(ca. 50 °C) have been investigated from a view point of rheology. The observed curves of relative viscosity of the system under a lower shear rate have a peak about the concentration of free HPC, which depends on the molecular weight of added HPC. These experimental results indicate that, after saturated adsorption, the free HPC molecules induce the dispersion to flocculate in spite of the dense adsorbing layer of HPC on the particles which would tend to give rise to a steric stabilization. This behaviour is interpreted to be a result of depletion effect.
Integration of Catalyst Activity Pattern (INCAP) Artificial Intelligence Approach in Catalyst Design
Authors: Hattori Tadashi , Kito Shigeharu , Murakami Yuichi
Published: July 2006

A novel knowledge representation scheme for the utilization of activity pattern was developed as a part of a prototype expert system for catalyst design. The result given by the system agreed well with published results, indicating the feasibility of the artificial intelligence approach in the design of catalysts.
A Remarkable Difference of the Positional Selectivity in Electrophilic Aromatic Substitution of Dibenzofuran between the Classical σ-Complex and Charge-Transfer Mechanisms
Authors: Keumi Takashi , Hamanaka Kozo , Hasegawa Haruo , Minamide Naoki , Inoue Yoshinori , Kitajima Hidehiko
Published: July 2006

Electrophilic nitration of dibenzofuran with nitric acid by a charge-transfer mechanism occurs exclusively at the 3-position and on the other hand, substitution at the 2-position predominates in the acylation, in which a classical σ-complex mechanism is important.
Control of the Stereoselectivity in the Synthesis of 1-Methyl-2,5-disubstituted Pyrrolidines by Mercury(II)-initiated Cyclization of Substituted Alk-4-enylamines
Authors: Tokuda Masao , Yamada Yasufumi , Suginome Hiroshi
Published: July 2006

The stereoselectivity in the synthesis of cis- and trans-1-methyl-2,5-disubstituted pyrrolidines by mercury(II)-initiated cyclization of substituted alk-4-enylamines can be controlled by choosing the appropriate mercury salt and solvent.
Polyion Complexation of Black Lipid Membranes (BLM) and Transport of a Hydrophobic Ion
Authors: Higashi Nobuyuki , Kunitake Toyoki , Möllerfeld J , Ringsdorf Helmut
Published: July 2006

Black lipid membranes were obtained from synthetic ammonium amphiphiles and their stabilities were enhanced by complexation with an anionic polymer. The permeation behavior of dipicrylamine anion was examined by the charge-pulse relaxation technique.
A Seleno-Pummerer Rearrangement of Haloselenuranes
Authors: Nakayama Juzo , Sugihara Yoshiaki
Published: July 2006

When heated or treated with triethylamine in tetrahydrofuran, diacetonyl- and diphenacylselenium dichlorides and their derivatives undergo seleno-Pummerer rearrangement to give the corresponding α-chloro selenides in good yields.
The First Preparation of Disilene via Reductive DehaIogenation of 1,2-DichIorodisi Iane. The Formation of an Unusual Air-Oxidation Product, 1-Oxa-2-si lacyclopent-3-ene Derivative
Authors: Watanabe Hamao , Takeuchi Ken , Nakajima Kenji , Nagai Yoichiro , Goto Midori
Published: July 2006

The most air-stable disilene, tetrakis(2,4,6-triisopropylphenyl)disilene, again was obtained by the reaction of 1,2-dichloro-1,1,2,2-tetrakis(2,4,6-triisopropylphenyl)disilene with lithium naphthalenide. The disilene afforded its air-oxidation product having 1-oxa-2-silacyclopent-3-ene framework which was determined by X-ray analysis.
Reactions of 2-(Tributylstannyl)-4,4-dimethyl-2-oxazoline with Organic Halides. Unusual Product from Aroyl Halide
Authors: Kosugi Masanori , Fukiage Akio , Takayanagi Mitsuhiro , Sano Hiroshi , Migita Toshihiko , Satoh Mitsuo
Published: July 2006

2-(Tributylstannyl)-4,4-dimethyl-2-oxazoline (1) reacted with aroyl chloride smoothly without any palladium catalyst to give the unusual product, bis(N-aroyl-4,4-dimethyl-2-oxazolinylidene) in good yields. The reaction of 1 with other types of halide needed a palladium catalyst, and gave the corresponding 2-substituted-4,4-dimethyl-2-oxazoline in good yields.
A Convenient Synthesis of Fluorobenzaldehydes by KF/Ph4PBr/18-Crown-6 Reagent System
Authors: Yoshida Yasuo , Kimura Yoshikazu
Published: July 2006

4-Fluorobenzaldehyde was easily synthesized from 4-chlorobenzaldehyde by potassium fluoride in the presence of tetraphenylphosphonium halide plus 18-crown-6 or poly(ethylene glycol) dimethyl ether. Several fluorobenzaldehyde derivatives were similarly prepared from the corresponding chloro-derivatives in good yields.
Synthesis and Spectroscopic Properties of Zn(II) Mono-2-(t-butyl)phthalocyanine
Authors: Konami Hideo , Hatano Masahiro
Published: July 2006

A simple method of synthesis which provides soluble mono-substituted phthalocyanine(Pc) complexes has been proposed. Concurrent measurements with non-, mono- and tetra-substituted Pc’s enabled to assign 1H NMR signals of ZnPc’s, and suggested complicated structure of so-called Soret(B) band in the UV-region of electronic spectra.
Scaled Particle Theory of Non-Spherical Molecules Extended for the Elucidation of the Entropy of Solution
Authors: Fujiwara Hideaki , Miyagi Rieko , Ohtaku Ikuji , Sasaki Yoshio
Published: July 2006

Scaled particle theory is extended to non-spherical molecules such as spherocylinders and disks in order to interpret the entropies of solution. Application of this treatment to normal alkanes from pentane to decane dissolved in 9-heptadecanone and in 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one has shown that the entropies measured can be interpreted almost fully by assigning realistic sizes for the solutes as well as for the solvents, supporting an important role of the cavity formation in the process of dissolution when viewed from the standpoint of entropies.
Reductive Elimination of sym-Diphenyltetramethyldisilane from cis-Bis(pheny1dimethylsilyl)bis(phosphine)platinum(II) Complexes
Authors: Kobayashi Toshi-aki , Hayashi Teruyuki , Yamashita Hiroshi , Tanaka Masato
Published: July 2006

Reductive elimination of cis-bis(phenyldimethylsilyl)bis(phosphine)platinum(II) complexes was found to occur to give sym-diphenyltetramethyldisilane together with redistribution by-products. Addition of free phosphine was favorable for the reductive elimination, and the disilane was formed in more than 80% yields.
Tracer Diffusion of Tris(1,10-phenanthroline)iron(II) Cation in Aqueous Sodium Dodecyl Sulfate Solutions. Strong Premicellar Interactions
Authors: Tominaga Toshihiro , Matsumoto Shigetoshi , Koshiba Takayuki , Yamamoto Yuroku
Published: July 2006

Tracer diffusion coefficient of Fe(phen)32+ (phen = 1,10-phenanthroline) has been determined in aqueous sodium dodecyl sulfate (NaDS) solutions at 298.2 K using Taylor dispersion technique. Below the critical micelle concentration (cmc) of NaDS (3–8 mM++), the diffusion coefficient is remarkably low, and increases with increasing concentration of NaDS.
Et3B-Induced Radical Reaction of 1,3-Diene Monoxide with C6F13I, PhSH, or Ph3GeH
Authors: Ichinose Yoshifumi , Oshima Koichiro , Utimoto Kiitiro
Published: July 2006

Treatment of 3,4-epoxy-1-butene with CgF13I, PhSH, or Ph3GeH in the presence of Et3B provides 4-substituted-2-buten-1-ol in good yield. Et3B–Ph3SnH mediated intramolecular alkylation of 1,3-diene monoxide are also described.
Experimental Evidence of N2 Formation from NO in Simulated Coal-fired Flue Gas by Electron Beam Irradiation
Authors: Namba Hideki , Aoki Yasushi , Tokunaga Okihiro , Suzuki Ryoji , Aoki Shinji
Published: July 2006

Nitrogen molecule formation was first observed experimentally in simulated coal-fired flue gas (NO–SO2–H2O–O2–N2) with the electron beam-ammonia treatment method in flow system. The increase of 29N2 was detected by mass-spectrometers in the flue gas containing N-15 labeled NO. The fraction of the 15NO converted to 29N2 was determined to be 23% at 14 kGy.
Syntheses and Separations of Diastereomers of Protected-Δ1-, Δ2-, and Δ3-Dehydrotripeptides
Authors: Shin Chung-gi , Kisuno Atsushi , Yonezawa Yasuchika
Published: July 2006

Total eighteen kinds of Δ1-, Δ2-, and Δ3-dehydrotripeptides (DHP) containing of a ΔPhe and two chiral α-amino acid residues were synthesized and the diastereomeric mixture of DHP were subjected to the HPLC separation. From the results and the 1H NMR spectral data, it was found to be significant relationship between the separation and the conformational structure of DHP.
A New Synthetic Route to Dehydrodipeptides Containing ΔAsp Residue from Oxazine-2,4-dione Derivatives
Authors: Shin Chung-gi , Yonezawa Yasuchika , Tokuumi Shoken
Published: July 2006

Reaction of N-benzyloxycarbonyl-dehydroaspartic acids with SOCl2 gave N-carboxy dehydroaspartic acid anhydride or oxazine-2,4-dione-6-carboxylic acids depending on the starting materials. The latter were found to be very useful compounds for the synthesis of various dehydropeptides.
Solvolytic Rearrangement of 5,6-Polymethylenebicyclo[4.2.0]octan-2-cl Derivatives to Functionalized Polymethylenebicyclo[3.2.1]- and [3.3.0]octanes
Authors: Ue Masaki , Nagashima Teruhisa , Kinugawa Masahiko , Kakiuchi Kiyomi , Tobe Yoshito , Odaira Yoshinobu , Yasuda Masahide , Shima Kensuke
Published: July 2006

The functionalized polymethylenebicyclo[3.2.1]- and [3.3.0]octane derivatives are newly synthesized from endo- and exo-5,6-polymethylenebicyclo[4.2.0]oct-2-yl 3,5-dinitrobenzoates by skeletal rearrangement using solvolysis.
A Soluble Poly(arylene) with Large Degree of Depolarization. Poly(2,5-pyridinediyl) Prepared by Dehalogenation Polycondensation of 2,5-Dibromopyridine with Ni(0)-Complexes
Authors: Yamamoto Takakazu , Ito Takayori , Kubota Kenji
Published: July 2006

Poly(2,5-pyridinediyl) was prepared by dehalogenation polycondensation of 2,5-dibromopyridine with Ni(0)-complexes. The polymer was soluble in formic acid, and the solution showed λmax at about 370 nm and large degree of depolarization.
Isolation and Structure of a New Natural Cyclopentenone Derivative from Potato Culture Solution of Phoma wasabiae Yokogi
Authors: Soga Osamu , Iwamoto Hidetoshi , Takuwa Akio , Takata Tamayo , Tsugiyama Yuko , Hamada Kensaku , Fujiwara Takaji , Nakayama Mitsuru
Published: July 2006

A new natural cyclopentenone derivative has been isolated from the potato culture solution of Phoma wasabiae, and its structure was determined to be (5S*)-5-acetyl-3,5-dimethoxy-2-methyl-(4R*)-4-[(2R*)-2-methylbutanoyl]-2-cyclopenten-1-one by spectroscopic and single crystal X-ray diffraction analyses.
The First Complete Optical Resolution Based on Chiral Discrimination between Ions of the Same Sign, u-fac-[Co(ida)2]− and [Sb2(d-tart)2]2−
Authors: Koine Norio
Published: July 2006

The complete optical resolution of the anionic complex, u-fac-[Co(ida)2]−, was achieved chromatographically by use of the anionic resolving agent, [Sb2 (d-tart)2]2−, on a strong anion-exchanger derived from Toyopearl (Fractogel TSK) gel. The chiral discrimination mechanism without direct contact of the racemate and resolving agent is suggested.
Anomalous Cycloaddition of Oxazoles with PTAD
Authors: Ibata Toshikazu , Isogami Yasushi , Tamura Hatsue
Published: July 2006

The reaction of various substituted oxazoles with 4-phenyl-1,2,4-triazole-3,5-dione gave anomalous cycloadducts, N-phenyl-5-acyl-Δ3-1,2,4-triazoline-1,2-dicarboximides in high yields through oxazole ring opening. The structure of one of the adducts was determined by a single-crystal X-ray analysis.
Thiolate-Bridged Binuclear Nickel(II) Complex with Thioether Pendant Groups
Authors: Handa Makoto , Mikuriya Masahiro , Okawa Hisashi , Kida Sigeo
Published: July 2006

A binuclear nickel(II) complex with N-[2-(2-pyridyl)ethyl]-N-[2-(methylthio)ethyl]-2-aminoethanethiol (HL), [Ni2(L)2](ClO4)2·H2O has been prepared and characterized by electronic spectra and magnetic susceptibilities (87–300 K). X-Ray structure analysis has revealed that the two nickel ions are bridged by two thiolate sulfur atoms, and each of them takes an elongated square-pyramidal configuration with a pendant thioether at the apex.
Crystal Structures of β-Cyclodextrin and Heptakis(2,6-di-O-methyl)-β-cyclodextrin Complexes with Carmofur
Authors: Harata Kazuaki , Hirayama Fumitoshi , Uekama Kaneto , Tsoucaris George
Published: July 2006

Two β-cyclodextrin molecules form a head-to-head dimer, into which the hexyl group of carmofur is inserted from the primary hydroxyl side. The fluorouracil moiety is located outside the host cavity and forms a face-to-face dimer with another one related by a pseudo twofold axis. The carmofur molecule in the heptakis(2,6-di-O-methyl)-β-cyclodextrin complex is disordered and occupies two sites. One is located outside the host cavity, while the hexyl group of the other is inserted into the host macrocycle.
Laser Fluorescence Excitation Spectrum of Jet-cooled 3-Isopropyltropolone. Proton Tunneling in the S1 State
Authors: Sekiya Hiroshi , Takesue Hiroto , Nishimura Yukio , Li Zhi-Hong , Mori Akira , Takeshita Hitoshi
Published: July 2006

Laser excited fluorescence spectra and dispersed fluorescence spectra of 3-isopropyltropolone have been measured in ultracold gas phase by a supersonic expansion. The tunneling splittings in the zero-point level of the S1 state have been determined to be 58 and 14 cm−1 for normal and deuterated species, respectively.
Computer-Controlled Reaction of Substituted N-(Carboxyalkyl)amino Acids
Authors: Hayashi Nobuyoshi , Sugawara Tohru
Published: July 2006

Kinetic equations for controlling the consecutive reactions in the reduction of a Schiff base, formed by the equilibrium reaction of an amino acid with a 2-keto acid, have been developed and applied to a computer-assisted automatic synthesis of substituted N-(carboxyalkyl)amino acids. The equations were especially useful for the prediction of optimum reaction conditions and on-line reaction control.
Diels–Alder Reaction of Chiral Acrylamide and a Convenient Synthesis of Optically Pure Methyl (3R, 4R, 6R)-Bicyclo [2. 2. 1]heptene-4-carboxylate
Authors: Kishikawa Keiki , Yamamoto Makoto , Kohmoto Shigeo , Yamada Kazutoshi
Published: July 2006

Asymmetric Diels–Alder reaction of the chiral acrylamide 1 proceeds highly diastereoselectively and methanolysis of the adduct 2 gives the optically pure (3R, 4R, 6R)-bicyclo [2. 2. 1]heptene-4-carboxylate.
Thermal Syntheses of Polypeptides from N-Boc-Amino Acid(Aspartic Acid,β-Aminoglutaric Acid) Anhydrides
Authors: Munegumi Toratane , Meng Yan-Qing , Harada Kaoru
Published: July 2006

N-t-Butyloxycarbonyl-amino acid(aspartic acid:Asp, glutamic acid:Glu, β-aminoglutaric acid: β-Agl)anhydrides were deprotected upon heating at temperatures slightly higher than the melting points of these compounds and polypeptides were synthesized easily in high yield.
Spillover Effects on Transfer-Hydrocracking of Heavy Oils
Authors: Fujimoto Kaoru , Nakamura Ikusei , Tominaga Hiro-o
Published: July 2006

A Ni–Mo/SiO2–Al2O3 catalyst which contained 1000 ppm of platinum exhibited an excellent activity for hydrocracking of Kuwait atmospheric residue without any activation. Coke on the catalyst was burned off by air at much lower temperature than that on a catalyst without platinum.
Electrophilic Sulphenylation of Silyl Ketene Acetals Derived from 3-Hydroxyesters. Diastereoselective Synthesis of Protected Epoxyalcohols
Authors: Guanti Giuseppe , Banfi Luca , Narisano Enrica , Thea Sergio
Published: July 2006

Anti-3-Hydroxy-2-phenylsulphenyl esters are stereoselectively synthesized by reaction between silyl ketene acetals and phenyl sulphenyl chloride. Subsequent elaboration leads to protected epoxyalcohols.
A Palladium/Porous-Glass Composite Membrane for Hydrogen Separation
Authors: Uemiya Shigeyuki , Kude Yukinori , Sugino Kohzoh , Sato Noboru , Matsuda Takeshi , Kikuchi Eiichi
Published: July 2006

Palladium was deposited on a porous-glass tube using a technique of electroless-plating. This composite membrane exhibited a remarkable permeability to hydrogen. Moreover, hydrogen was selectively separated from H2–N2 and H2–CO gas mixtures through the composite membrane.
A Convenient Synthesis of 1,3-Oxathiole-2-thione Derivatives. Reaction between Sodium 1-Imidazolecarbodithioate and α-Haloketones
Authors: Ishida Masaru , Sugiura Kohji , Takagi Kazutaka , Hiraoka Hajime , Kato Shinzi
Published: July 2006

Reaction between sodium 1-imidazolecarbodithioate, prepared from sodium imidazole and carbondisulfide, and α-haloketone gave the corresponding 1,3-oxathiole derivatives in high yields.
A Convenient Method for Dihydroxylation of Olefins by the Combined Use of Osmium Tetroxide and Dihydroxyphenyiborane
Authors: Iwasawa Nobuharu , Kato Takashi , Narasaka Koichi
Published: July 2006

cis-Dihydroxylation of olefins with a catalytic amount of osmium tetroxide and N-methylmorpholine N-oxide proceeds smoothly in an organic solvent by the use of dihydroxyphenyiborane, giving the corresponding 2-phenyl-1,3,2-dioxaborolane derivatives (phenylboronic esters) in good yields.
Stereoselective Synthesis of Tetrahydrofuran Moieties of Thyrsiferol and Venustatriol, Stereocontrolled Epoxidation of Bishomo- and Trishomo-allylic Alcohols
Authors: Nozaki Koji , Shirahama Haruhisa
Published: July 2006

cis- and trans-2-(1,2-Diacetoxyethyl)-5-(1-hydroxy-1-methylethyl)-2-methyltetrahydrofurans were stereoselectively derived from 1,2-diacetoxy-3,7-dimethyloct-6-en-3-ol and 1,3-O-dimethoxybenzylidene-3,7-dimethyloct-6-en-2-ol respectively.
Temperature Dependence of the Mixed-Valence States in 1′,1'″-Bis(o-methylbenzyl)biferrocenium+ TCNE−
Authors: Nakashima Satoru , Masuda Yuichi , Sano Hirotoshi
Published: July 2006

1′, 1'″-Bis(o-methylbenzyl)biferrocenium+ TCNE− was synthesized and its mixed-valence state was studied by means of ESR and Mössbauer spectroscopy. It was found from Mössbauer spectra that the trapped- and the averaged-valence states coexist at higher temperatures and the relative areal intensity of the averaged-valence state increases with an increasing temperature. An abrupt increase of the relative areal intensity above 180 K suggests that an intermolecular effect on the mixed-valence state changes at the temperature.
A Theoretical Analysis of the Regiochemistry in the Intramolecular Photocycloaddition of 1,5-Hexadien-3-ones and 2-Formyl-1,5-hexadienes
Authors: Ohsaku Masaru
Published: July 2006

A regiochemistry of the photolysis of the substituted 1,5-hexadienes was analyzed by using an ab initio SCF MO procedure. The calculated total energies explained the observed product distributions.
Asymmetric Trans-addition Reactions of a Chiral Selenobinaphthyl with Prochiral Olefins. The Case of Methoxyselenenylation
Authors: Tomoda Shuji , Iwaoka Michio
Published: July 2006

The first asymmetric methoxyselenenylation reaction between bis[R-(1,1′-binaphthalene)-2-yl] diselenide and olefins has been achieved with optical yields of up to 49%.
Polymorphism in Bilayer Membranes of Novel Double-Chain Ammonium Amphiphiles
Authors: Kimizuka Nobuo , Takasaki Takahiro , Kunitake Toyoki
Published: July 2006

New double-chain ammonium amphiphiles which possess the ether linkage in the alkyl tails form bilayer membranes with regular side-chain packing in the crystalline state and display remarkable myelin figures in the liquid crystalline state.
Novel Synthesis of Macrocyclic Lactones from ω-Carboxyalkylsulfonium Salts
Authors: Matsuyama Haruo , Nakamura Takako , Takatsuka Akinori , Kobayashi Michio , Kamigata Nobumasa
Published: July 2006

An intramolecular cyclization of S-(ω-carboxyalkyl)thiolanium salts took place readily under weakly basic conditions to afford sulfur-containing macrocyclic lactones in good yields.
6-O-Trisubstituted β-Cyclodextrins Whose Substituents Are Different from One Another
Authors: Fujita Kahee , Matsunaga Atsuo , Yamamura Hatsuo , Imoto Taiji
Published: July 2006

6A-S-phenyl-6F-O-(β-naphthalenesulfonyl)-6X-O-(p-toluenesulfonyl)-6A-thio-β-cyclodextrins (X = B, X = C, X = D, X = E, and X = G) were prepared from the reaction of 6A-S-phenyl-6F-O-(β-naphthalenesulf onyl)-6A-thio-β-cyclodextrin with p-toluenesulfonyl chloride in pyridine. The structures were determined through their Taka amylase A-catalyzed hydrolyses.
An Improved Method for Preparation of CdS Particle-Dispersing Film with Excellent Light-Induced Current Generation
Authors: Honda Kenji , Kuwano Atsushi , Chiba Kazuyuki , Ishikawa Akira , Miyama Hajime
Published: July 2006

A homogeneously CdS particle-dispersing film was obtained according to the counter-current method by which Cd2+ and H2S were incorporated into Nafion film from an opposite side in a counter-current diffusion way. The resulting film had a light-induced current in an order of μA cm−2 with a ratio of current in light to dark around 430.
Radical Polymerization Behavior of Phenylallene. Synthesis of Functional Polymer Containing Styryl Moiety on the Backbone
Authors: Yokozawa Tsutomu , Ito Naoro , Endo Takeshi
Published: July 2006

Radical homopolymerization of phenylallene (PA) and copolymerization of PA with some vinyl monomers were described. PA polymerized selectively by the terminal double bond of allene both in the homopolymerization and the copolymerization. The radical reaction of PA with thiophenol was also carried out as a model reaction of the polymerization to discuss the polymerization process of PA.
A Novel Reaction of Ethyl 2,3-Butadienoate with Aldehydes in the Presence of Base
Authors: Tsuboi Sadao , Takatsuka Satoshi , Utaka Masanori
Published: July 2006

Reaction of ethyl 2,3-butadienoate with aldehydes in the presence of DABCO gave ethyl 2-(1-hydroxyalkyl)-2,3-butadienoate (2) in 41–54% yields. The reaction in the presence of butyl lithium gave 2 in 36–60% yields accompanied by ethyl 2,4-di(1-hydroxyalkyl)-2,3-butadienoate.
An Infrared Study of Molybdenum Carbonyl–Butadiene Complexes Encaged in a Zeolite. Implication of the Active Molybdenum Carbonyl Species in the Hydrogenation of Butadiene
Authors: Okamoto Yasuaki , Kane Hiroshige , Imanaka Toshinobu
Published: July 2006

Molybdenum carbonyls encaged in a NaY zeolite were found to form stable butadiene complexes; Mo(CO)4(C4H6) and Mo(CO)2(C4H6)n (n = 1 or 2). These complexes are implied to deactivate the hydrogenation of C4H6 over molybdenum carbonyls/zeolite catalysts. The active species is proposed to be Mo(CO)3 ads.
A Route to Key Fragments of Mycoticin B and Amphotericin B from (S)-O-Benzylglycidol
Authors: Takano Seiichi , Shimazaki Youichi , Sekiguchi Yoshinori , Ogasawara Kunio
Published: July 2006

A concise enantioselective synthesis of C27−34 fragment of mycoticin B and C31−37 fragment of amphotericin B is described using a common building block prepared from (S)-O-benzylglycidol.
Selective Adsorption of Fluoride Ion by La(III)-loaded Chelating Resin Having Phosphonomethylamino Groups
Authors: Kanesato Masatoshi , Yokoyama Toshiro , Suzuki Toshishige M
Published: July 2006

Adsorption characteristics of La(III)-loaded chelating resin containing phosphonomethylamino groups for fluoride ion has been studied. Fluoride ion is effectively adsorbed on the column packed with La(III)-loaded resin at pH ranging 3.0-4.0. The retained fluoride ion has been released from the column by elution with 1 mol dm−3 sodium hydroxide solution without any leakage of the metal ion. The column can be used repeatedly after regeneration.
Quasi Three-Dimensional Electrical Conductor Having Alternating Mixed Stacks: Tetrakis(methyltelluro)tetrathiafulvalene (TTeC1-TTF)·TCNQ Complex
Authors: Iwasawa Naoko , Shinozaki Fumihiko , Saito Gunzi , Oshima Kokichi , Mori Takehiko , Inokuchi Hiroo
Published: July 2006

Tetrakis(methyltelluro)tetrathiafulvalene (TTeC1-TTF) and TCNQ give a 1:1 CT complex with alternating mixed stacks whose electrical conductivity along the stacking direction is 1.0×10−2 S cm−1. Quasi three-dimensional electrical conductivity was observed owing to its unique crystal structure where exist the two equivalent neighboring stacks linking each other with short Te···N contacts. These properties are compared with those of TTC1- and newly prepared TSeC1-TTF·TCNQ complexes.