bluuebunny/crossref_metadata_2025 huggingface dataset:
Production of Higher Alcohols from Synthesis Gas over Coprecipitated Nickel Catalysts
Authors: Hayasaka Toshiaki , Obayashi Yasuo , Uchiyama Souichi , Kawata Noboru
Published: July 2006

Coprecipitated Ni–TiO2 and Ni–MnO catalysts efficiently produced higher alcohols such as ethanol, propanol and butanol from synthesis gas. These catalysts showed lower activities for ethane hydrogenolysis but much higher activities for ethylene hydroformylation than conventional supported nickel catalysts.
Isotopic Exchange of Oxygen-18 of Carbon Dioxide with Lattice Oxygen of Bismuth Molybdate
Authors: Matsuura Ikuya , Kirishiki Masaru
Published: July 2006

The isotopic oxygen exchange reaction of bismuth molybdate was found, to proceed very easily with oxygen-18-labelled carbon dioxide, though this does not proceed with gaseous oxygen-18. Moreover, all oxygen in the catalyst has been found to be replaced with oxygen-18 from carbon dioxide. It was thus proven that the bismuth molybdates have high diffusivility of oxide ions through their crystal lattice without any oxygen vacancies at temperatures above 220 °C.
Lead Promoted Barbier-Type Reaction of Propargyl Bromide with Aldehydes
Authors: Tanaka Hideo , Hamatani Takeshi , Yamashita Shiro , Torii Sigeru
Published: July 2006

The first example of lead-promoted “Barbier-type” (in situ Grignard) reaction has been demonstrated by the reaction of propargyl bromide with aldehydes in a Pb/Bu4NBr/Me3SiCl/DMF system.
Asymmetric Synthesis of (S)-2-(6-Methoxy-2-naphthyl)propanoic Acid
Authors: Hiyama Tamejiro , Saito Kumi , Sato Ken-ichi , Wakasa Noriko , Inoue Masuo
Published: July 2006

For the synthesis of the title compound of 60% ee, a new method is established which involves cyanation of an acetal derived from 1-(6-methoxy-2-naphthyl)ethanone and (S,S)-2,4-pentanediol, alkaline hydrolysis, and finally hydrogenolysis with palladium catalyst.
Reductive Rearrangement with Hydride Transfer of Linearly and Angularly Fused Triquinanes
Authors: Kakiuchi Kiyomi , Ue Masaki , Kumanoya Shuichi , Takeuchi Hideyuki , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

Relationship between linearly and angularly fused triquinanes is elucidated by reductive rearrangements with hydride transfer of tricyclo[6.3.0.02,6]undecan-1-ol, tricyclo[6.3.0.01,5]undecan-6-ols, and tricyclo[5.3.1.01,5]undecan-11-ol.
Direct Synthesis of Acetic Acid from Synthesis Gas over Rh–Mn–Zr–Li/SiO2 Catalyst
Authors: Nakajo Tetsuo , Sano Ken-ichi , Matsuhira Shinya , Arakawa Hironori
Published: July 2006

The direct synthesis of acetic acid from synthesis gas has been investigated. Acetic acid was produced with more than 63% selectivity over Rh–Mn–Zr–Li/SiO2 catalyst at 300 °C under 100 kg/cm2 of synthesis gas (CO/H2 = 9/1) flow.
Novel Diterpenes with Bicyclo[5.4.0]undecane Skeleton from Portulaca grandiflora Hook, Possible Linking Intermediates in the Biosynthesis of Portulal
Authors: Ohsaki Ayumi , Shibata Kozo , Tokoroyama Takashi , Kubota Takashi , Naoki Hideo
Published: July 2006

Three new diterpenes with bicyclo[5.4.0]undecane skeleton were isolated from Portulaca grandiflora Hook and their structures have been elucidated by spectroscopic methods involving an extensive application of NMR technigues. The significance of these compounds in the consideration of biosynthesis of portulal is suggested.
Microenvironmental Control of Photoinduced Electron Transfer and the Reverse Reactions in Porphyrin–Viologen Linked System
Authors: Nakamura Hiroshi , Motonaga Akira , Ogata Takeshi , Nakao Seiji , Nagamura Toshihiko , Matsuo Taku
Published: July 2006

Effects of spacer chain length on photoinduced electron transfer in porphyrin–viologen linked system (ZnPCnV) were investigated by laser photolysis. A long-living charge separated state was obtained with ZnPC4V in both homogeneous and bilayer systems, while ZnPC6V and ZnPC8V afforded appreciable charge separated states only in homogeneous system.
THE DIPHENYLBORYL HEXACHLOROANTIMONATE PROMOTED FRIEDEL–CRAFTS ACYLATION REACTION
Authors: Mukaiyama Teruaki , Nagaoka Hitoshi , Ohshima Masahiro , Murakami Masahiro
Published: July 2006

In the presence of a catalytic amount of diphenylboryl hexachloroantimonate(Ph2BSbCl6), acid chlorides or acid anhydrides react smoothly with aromatic compounds such as anisole and veratrole to give the corresponding aromatic ketones in good yields under mild conditions. Diphenylboryl hexachloroantimonate also activates acyl enolates in the Friedel–Crafts acylation reaction to give the aromatic ketones in good yields under almost neutral conditions.
Photoelectric Conversion with the Dye Multilayer on a Semiconductor Electrode
Authors: Higuchi Yuji , Kasatani Kazuo , Kawasaki Masahiro , Sato Hiroyasu
Published: July 2006

Photoelectric conversion with the dye-containing multilayers on an Sb-doped SnO2 optically transparent semiconductor electrode was studied, using 2,8-bis(dimethylamino)-10-dodecyl-acridinium bromide (BDA) and dioctadecylthiacarbocyanine iodide (DTC). A remarkable enhancement of the photocurrent was observed as a result of the efficient energy transfer from BDA to DTC.
A Simple Method for the Determination of pK3 Value of Porphyrins
Authors: Datta-Gupta Nirmalendu , Malakar Debasis , Jones Vincent O , Wright Terry
Published: July 2006

To determine the pK3 value of porphyrins, a simple spectrofluorometric titration method has been developed. The porphyrin solution is titrated with perchloric acid. After each addition of acid, the porphyrin solution is excited at one suitable wave length and the emission intensity is measured at another suitable wave length. The pK3 values of twelve porphyrins have been determined. Nitrobenzene, toluene and water have been used as solvents. The pK3 values have been compared with the literature values. Attempt has been made to correlate the Cu+2 insertion kinetics of six porphyrins and their pK3 values.
AN ESR IMAGE OF NITRODIOXIDE MOLECULES ADSORBED ON A COPPER ROD AT 10 K
Authors: Ohno Keiichi
Published: July 2006

Spatial distribution of paramagentic nitrodioxide molecules adsorbed on a rod-like cryo-tip sample holder, was measured using ESR imaging. This technique will serve to investigate surface diffusion of reactant species on catalyses.
A Regioselective Aluminum Chloride-catalyzed Acylation of Allylic Selenides via α-Silyl Intermediates. A Facile Route to Dihydrojasmone
Authors: Hiroi Kunio , Sato Hiroyasu
Published: July 2006

The aluminum chloride-catalyzed acylation of α-silylallylic selenides with acid chlorides at −78 °C produced γ-acylated vinylic selenides regioselectively. α-Silylallylic selenides in some cases underwent [1,3] shifts of the selenenyl groups by the catalysis with aluminum chloride, affording γ-silylallylic selenides. This regioselective acylation of allylic selenides provides a new route to dihydrojasmone.
Novel Syntheses of Optically Active 4-Demethoxyanthracyclinones Carrying a Hydroxymethyl or a Carbamoyloxymethyl Group at the C9-Position
Authors: Suzuki Michiyo , Matsumoto Teruyo , Ohsaki Masako , Kimura Yoshikazu , Terashima Shiro
Published: July 2006

The title compounds were effectively synthesized by chemoselective reduction of (R)-methyl 2,5,12-trihydroxy-6,11-dioxo-1,2,3,4-tetrahydronaphthacene-2-carboxylate to the corresponding (R)-alcohol with lithium tri-t-butoxyaluminium hydride, followed by stereoselective C7α-hydroxylation (the anthracycline numbering) and urethane formation.
A Practical Preparations of Conjugated Nitroalkenes
Authors: Jew Sang-sup , Kim Hee-doo , Cho Youn-sang , Cook Chae-ho
Published: July 2006

Treatment of alkenes (1a–5a) with sodium nitrite and iodine in ethyl acetate (or ether) and water in the presence of ethylene glycol (or propylene glycol) provides conjugated nitroalkenes (1b–5b) in 49–82% yields.
Changes of Cation Binding Ability of Cyclic Alkene Enhanced by Photosensitized Isomerization from cis to trans Form
Authors: Sasaki Hiroshi , Ueno Akihiko , Osa Tetsuo
Published: July 2006

A cyclic polyether (1) showed enhanced cation binding ability by trans to cis photoisomerization in the presence of benzophenone. The results were explained in terms of the profitable structural arrangement of oxygen atoms of the polyether linkage in cis-1.
Direct Observation of Stannyl Radicals by Laser-Photolysis of Carbon–Tin and Tin–Tin Bonds
Authors: Mochida Kunio , Wakasa Masanobu , Sakaguchi Yoshio , Hayashi Hisaharu
Published: July 2006

Photochemical primary processes of carbon–tin and tin–tin bonds were studied at room temperature. The stannyl radicals generated were observed directly by laser-photolysis.
Preparation and Some Reactions of Dibenzo-7-silanorbornadiene Derivatives
Authors: Sakurai Hideki , Oharu Kazuya , Nakadaira Yasuhiro
Published: July 2006

On irradiation, dibenzo-7-silanorbornadienes with bulky substituents on silicon generated the corresponding crowded silylenes that dimerized to kinetically stable disilenes in the absence of trapping agents. Dibenzo-7-silanorbornadienes also underwent a new type of photochemical isomerization competitively.
A Highly Stereoselective Synthesis of γ-Acyl-δ-lactones by the Trityl Perchlorate Catalyzed Tandem Michael-aldol Reaction
Authors: Kobayashi Shu , Mukaiyama Teruaki
Published: July 2006

γ-Acyl-δ-lactones are prepared in high yields with high stereoselectivities by the trityl perchlorate catalyzed tandem Michael-aldol reaction between α,β-unsaturated ketones, ketene silyl acetals, and aldehydes.
Preparation of Graphite Intercalation Compound of Titanium Fluoride in Fluorine Atmosphere
Authors: Nakajima Tsuyoshi , Nakane Kenji , Kawaguchi Masayuki , Watanabe Nobuatsu
Published: July 2006

Graphite intercalation compound(GIC) of titanium fluoride has been prepared in fluorine atmosphere. The GIC’s prepared were mainly stage 2 compounds with repeat distance, 11.28–11.59 Å and composition, C11−15TiF4.5−6.2. ESCA spectrum indicates that intercalated TiF62− anions are in bridged state.
Photodimerization of Anthracene Derivative in Langmuir–Blodgett Films
Authors: Ouchi Akihiko , Tanaka Motoo , Nakamura Takayoshi , Matsumoto Mutsuyoshi , Kawabata Yasujiro , Tomimasu Sumie , Yabe Akira
Published: July 2006

Mixed Langmuir–Blodgett (LB) films of (10-butyl-9-anthryl)-3-propanoic acid (1) and arachidic acid were prepared and their UV-Vis spectra were measured. Photodimerization of 1 in these LB films was successfully performed with monochromatic light.
Rapid Oxidation of NO to NO2 at ppm Concentration Level in a Heterogeneous Photocatalytic Reaction on Metal Oxide Powders
Authors: Hori Yoshio , Fujimoto Katsuhiro , Suzuki Shin
Published: July 2006

Photocatalytic reactions of NO at ppm level with O2 were studied in the presence of TiO2 (anatase), PbO, and ZnO using a chemical luminescence NOX analyzer and a second derivative spectrometer. The rate of oxidation of NO was very high, e.g. 1930% cm−2 h−1 in a photocatalytic reaction on TiO2 (anatase). Photoadsorption of NOX also took place on these metal oxides.
Tetrakis(n-alkyltelluro)tetrathiafulvalene (TTeCn-TTF)
Authors: Okada Naoko , Yamochi Hideki , Shinozaki Fumihiko , Oshima Kokichi , Saito Gunzi
Published: July 2006

A series of tetrakis(n-alkyltelluro)tetrathiafulvalene (TTeCn-TTF) was synthesized where n ranges from 1 to 18. Some chemical and physical properties of TTeCn-TTF were studied and compared with those of the sulfur analogues; tetrakis(n-alkylthio)tetrathiafulvalene (TTCn-TTF).
Stereo-controlled Alkylation of Cyclodecadienone Derivatives and the Total Synthesis of (−)- and (+)-4,5-cis-3β-Hydroxygermacranolides
Authors: Nakamura Takayoshi , Hirota Hiroshi , Kuroda Chiaki , Takahashi Takeyoshi
Published: July 2006

Direct trapping of the intermediate, produced by anionic oxy-Cope rearrangement of (1R,4S,6S)-4-alkoxy-1-ethenyl-3-methyl-6-(1-methylethenyl)-2-cyclohexen-1-ol, with ethyl bromoacetate gave ethyl [3S,7S,1(10)E,4Z]-3-alkoxy-6-oxo-13-nor-1(10),4-germacradien-12-oate stereoselectively, which was converted into a natural (−)-4,5-cis-3β-hydroxygermacranolide.
Optical Resolution of Tertiary Acetylenic Alcohols and Secondary Alcohols by Complexation with Achiral Amines
Authors: Toda Fumio , Tanaka Koichi
Published: July 2006

Partially resolved tertiary acetylenic alcohols and secondary alcohols were easily resolved completely by complexation with achiral amines such as 1,4-diazabicyclo[3.3.3]octane (DABCO), N,N′-dialkylpiperazine, N,N,N′,N′-tetramethylethylenediamine, and pyrazine, to give optically pure enantiomers. Interestingly, DABCO formed more stable complex with optically pure enantiomers but the other amines formed more stable complex with racemic compounds.
PREFERENTIAL BENT STRUCTURE OF THE HYDROPHOBIC GROUP OF TRITON X-100 SURFACTANT. A RAMAN SPECTROSCOPIC STUDY
Authors: Matsuura Hiroatsu , Fukuhara Koichi
Published: July 2006

Structure of the hydrophobic group of Triton X-100 surfactant was studied by a Raman spectroscopic method. The spectral analysis indicated that this group preferentially takes the bent structure with the 1,1,3,3-tetramethylbutyl group in the gauche conformation.
Photo-induced Conversion of Aryl(trichlorovinyl)nickel(II) Complexes into Two Isomeric Mono-organonickel(II) Complexes
Authors: Wada Masanori , Kumazoe Makoto , Matsuhiro Yasushi , Erabi Tatsuo
Published: July 2006

Photolysis (>330 nm) of trans-[Ni(CCl=CCl2)(C6H4Y)(PMe3)2] (Y= Me-4, Cl-4) resulted in the formation of two isomeric mono-organonickel(II) complexes, trans-[Ni{CCl=CCl(C6H4Y)}Cl(PMe3)2] and trans-[Ni{C(C6H4Y)=CCl2}Cl(PMe3)2], possibly by reductive elimination followed by oxidative addition.
Crystal Structures of Hexakis (2,6-di-O-methyl)-α-cyclodextrin Complexes with Iodine and 1-Propanol
Authors: Harata Kazuaki
Published: July 2006

Crystal structures of the title compounds were determined by the X-ray analysis. The host molecule in the both complexes has a round shape, which is maintained by intramolecular O(3)–H···O(2) hydrogen bonds, and arranged in a cage-type packing mode. The guest molecules are included within the cavity of the macrocyclic ring and situated at the wider O(2), O(3) side of the cavity.
Reactivity toward Alcohols of (RuIV=O2−) Unit in trans-[RuCl(O)(py)4]+
Authors: Aoyagi Kimitake , Nagao Hirotaka , Yukawa Yasuhiko , Ogura Mariko , Kuwayama Akito , Howell F Scott , Mukaida Masao , Kakihana Hidetake
Published: July 2006

The reactivity with alcohol of trans-[RuCl(O)(py)4]+ was investigated. In MeOH, trans-[RuCl(OH)(py)4]+ was confirmed to exist as a precursor in the formation of trans-[RuCl(OMe)(py)4]+. The reaction progress was traced by spectrometrical and 18O-labelling experiments.
SYNTHESIS AND ELECTRONIC ABSORPTION SPECTRA OF MONOETHYNOLOGS OF MALACHITE GREEN WITH p-SUBSTITUENT ON PHENYL RING
Authors: Nakatsuji Shin’ichi , Okamoto Naoko , Nakashima Kenichiro , Akiyama Shuzo
Published: July 2006

A series of bis(p-dimethylaminophenyl)(p-substituted phenylethynyl)carbonium perchlorates has been prepared. The electronic spectral properties are affected by both coplanarity of the cation parts and the effect of substituent on phenyl ring. A linear relationship was obtained between the wave numbers (\ ildeν) of the longest wavelength absorption maxima and σp.
A CONVENIENT METHOD FOR THE PREPARATION OF α-ALKYLATED VINYLIC SULFONES AND THEIR CONVERSION TO ALLYLIC SULFONES
Authors: Inomata Katsuhiko , Tanaka Yuhji , Sasaoka Shin-ichi , Kinoshita Hideki , Kotake Hiroshi
Published: July 2006

2-Pyrrolidinoalkyl p-tolyl sulfones, which were readily available by the addition of pyrrolidine to vinylic or allylic sulfones, were converted to the corresponding α-alkylated vinylic sulfones through α-alkylation followed by elimination of pyrrolidino group. Some of the α-alkylated vinylic sulfones were further transformed to the corresponding allylic sulfones.
AN APPLICATION OF A MODEL CATALYST METHOD TO A STUDY ON A SUPPORTED CATALYST ELECTRODE. EFFECTS OF PARTICLE SIZE ON THE ELECTROCHEMICAL DESORPTION BEHAVIOR OF HYDROGEN FROM SMALL PLATINUM PARTICLES
Authors: Takasu Yoshio , Fujii Yuichi , Enami Eiji , Matsuda Yoshiharu
Published: July 2006

A model catalyst-electrode has been applied for the first time to a cyclic voltammetry study with respect to the adsorption-desorption behavior of hydrogen in an aqueous solution of H2SO4. The peak potentials for the desorption of hydrogen were found to depend greatly on the platinum particle size.
REACTION OF (E)-PHENYL 2-PYRIDYL KETONE O-ACYLOXIMES (PPAO) WITH GRIGNARD REAGENTS. A CONVENIENT AND HIGHLY CHEMOSELECTIVE SYNTHESIS OF KETONES
Authors: Miyasaka Tadayo , Monobe Hideaki , Noguchi Shunsaku
Published: July 2006

The reaction of (E)-phenyl 2-pyridyl ketone O-acyloximes (PPAO) with Grignard reagents was found to be widely applicable to the chemoselective synthesis of various ketones in good yields under mild conditions.
SYNTHESIS OF QUINONE-CAPPED PORPHYRINS BY PORPHYRIN SELF-PHOTOSENSITIZED REACTION
Authors: Osuka Atsuhiro , Furuta Hiroyuki , Maruyama Kazuhiro
Published: July 2006

Quinone-capped porphyrins having formally perpendicular, coplanar, and orthogonal relative orientations were synthesized in one-pot by porphyrin self-photosensitization.
ACTION SPECTRUM FOR PHOTOINACTIVATION OF BACTERIOPHAGE LAMBDA SENSITIZED WITH 5-METHOXYPSORALEN. ROLE OF LIGHT ABSORPTION BY THE 4′,5′ ADDUCT
Authors: Fujita Hitoshi , Sasaki Masako
Published: July 2006

An action spectrum for photoinactivation of phage λ sensitized with 5-methoxypsoralen was measured. The maximal action was observed at 330 nm away from the absorption peak( 312 nm ). This implies that the second step absorption by the 4′,5′ adduct is much more efficient for the inactivation than the first step absorption.
STRONG METAL-SUPPORT INTERACTION (SMSI) BEHAVIOR OF Rh/Nb2O5 CATALYST STUDIED BY ETHANE HYDROGENOLYSIS AND HYDROGEN CHEMISORPTION
Authors: Kunimori Kimio , Ito Katsunori , Iwai Kiyoyuki , Uchijima Toshio
Published: July 2006

The high-temperature (773 K) pretreatment of a Rh/Nb2O5. catalyst in He as well as in H2 caused drastic decrease (by 103 in He, by 106 in H2) in the activity of ethane hydrogenolysis. Considering also the behavior of hydrogen chemisorption, there appears to be a difference in the nature of SMSI between Rh/Nb2O5 and Rh/TiO2 systems.
AN ANION-PROMOTED REARRANGEMENT OF 2-(o- AND p-NITROBENZYLOXY)TROPONES TO α-HYDROXYLATED 2-(o- AND p-NITROBENZYL)TROPONES. A READY INTRODUCTION OF ARALKYL GROUP INTO THE TROPONOID NUCLEUS
Authors: Takeshita Hitoshi , Mori Akira , Suizu Hiroshi
Published: July 2006

During the preparation of 2-(o- and p-nitrobenzyloxy)tropones from o- and p-nitrobenzyl chlorides and potassium tropolonate, a concomittant formation of α-hydroxylated 2-(o- and p-nitrobenzyl)tropones and 3-(o- and p-nitrobenzyl)tropolones was recognized. This alkali-promoted reaction has no precedent analogy in the troponoid chemistry. From the 2-(p-nitrobenzoyl)tropone, a tetrahydrobenzodiazaheptalenone, 6-(p-nitrophenyl)-5,7,11a,12-tetrahydrocyclohepta[b](1,5)benzodiazepin-7-one, was prepared.
A NEW METHOD FOR THE MEASUREMENT OF COPPER(II)-COMPLEXING CAPACITY OF NATURAL WATERS BY BACK-EXTRACTION TECHNIQUE
Authors: Akaiwa Hideo , Kawamoto Hiroshi , Ogura Hiroshi
Published: July 2006

Back-extraction technique using bis(4,4,4-trifluoro-1-pheny1-1,3-butanedionato)copper(II) was introduced to develop a method for the measurement of the copper(II)-complexing capacity(CuCC) and the method was applied to river water samples. Some ligands derived from human activity were found to cause an enhancement in the CuCC-value.
ETHYLENE ABSORPTION BY SOLUTIONS OF COPPER(I) CHLORIDE AND AMINES IN METHANOL
Authors: Hirai Hidefumi , Kurima Kazunori , Komiyama Makoto
Published: July 2006

N,N,N′,N′-Tetramethylethylenediamine, N,N,N′,N′-tetraethylethylenediamine, and N,N,N′-trimethylethylenediamine are stirred with copper(I) chloride in methanol at a charged molar ratio of unity, resulting in homogeneous solutions of the copper(I) chloride-diamine complexes. The solutions, respectively, absorb 11.0, 4.8, and 11.3 mmol of ethylene at 20 °C under 1 atm.
DETERMINATION OF STEREOCONFIGURATION OF 1,2-DIARYLOXYCYCLOBUTANES BY OPTICAL RESOLUTION AND INTRAMOLECULAR EXCIMER FORMATION OF CIS-1,2-DIPHENOXYCYCLOBUTANE
Authors: Mizuno Kazuhiko , Otsuji Yoshio
Published: July 2006

Two enantiomers of trans-1,2-diaryloxycyclobutanes were resolved by high-performance liquid chromatography (HPLC) using columns packed with chiral compounds. Measurement of fluorescence indicated that cis-1,2-diphenoxycyclobutane formed an intramolecular excimer between two phenoxy groups at ambient temperature.
DOMAIN STRUCTURES OF LiNbO3 CRYSTALS GROWN BY A FLOATING ZONE TECHNIQUE
Authors: Kawakami Shoji , Ishii Eiichi , Takahashi Akio , Tsuzuki Akihiro , Sekiya Tadashi , Torii Yasuyoshi
Published: July 2006

LiNbO3 single crystals were grown from the congruently melting composition by a floating zone technique. It was confirmed by etching that the single domain crystals were produced without applying any external electric field. When annealed above the Curie temperature, antiparallel domain appeared in the form of annual rings.
PHENYL AND CYCLOHEXYL GROUPS AS SIMILARLY-SHAPED SUBSTITUENTS PRODUCING VERY SIMILAR CHEMICAL SELECTIVITY IN OXIDATION OF ASSOCIATING THIOLS
Authors: Endo Tadashi , Kasahara Hisashi , Yagi Shigeki , Tajima Koki , Ito Masato M , Ogino Masahiko , Hagino Kazuomi
Published: July 2006

The selectivity in oxidation of a pair of associating thiols, one with R2 as a substituent, was examined in aqueous acetonitrile. The selectivity for acyclic alkyl groups (R2) differed entirely from that for the cyclohexyl and phenyl groups (R2) at 35.0 °C. The pattern of temperature dependence of the selectivity for the two similarly-shaped cyclic groups (i.e., cyclohexyl and phenyl groups) was very similar to each other.
CATALYTIC FUNCTION OF A HOST–GUEST COMPLEX DERIVED FROM OCTOPUS AZAPARACYCLOPHANE AND HYDROPHOBIC VITAMIN B12 AS A HOLOENZYME MODEL
Authors: Murakami Yukito , Hisaeda Yoshio , Kikuchi Jun-ichi , Ohno Teruhisa , Suzuki Masashi , Matsuda Yoshihisa
Published: July 2006

The isomerization reaction accompanied with carbon-skeleton rearrangement, as typically catalyzed by the vitamin B12-dependent methylmalonyl-CoA mutase, was simulated by employing the host–guest complexes formed with an octopus azaparacyclophane having eight hydrocarbon chains and hydrophobic vitamin B12 derivatives.
LASER-PHOTOLYSIS STUDY OF ARYL-SUBSTITUTED SILYL AND STANNYL ANIONS
Authors: Mochida Kunio , Wakasa Masanobu , Sakaguchi Yoshio , Hayashi Hisaharu
Published: July 2006

Photochemical primary processes of aryl-substituted silyl and stannyl anions were studied at room temperature. The silyl and stannyl radicals generated were observed directly by laser-photolysis.
EXCLUSIVE CYCLIZATION AT SULFUR IN PHOTOLYSIS OF β-[(o-ARYLTHIO)PHENYL]VINYL BROMIDES
Authors: Kitamura Tsugio , Kawasato Hironobu , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Photolysis of β-[(o-arylthio)phenyl]vinyl bromides, in contrast to the oxy-derivatives, resulted in exclusive cyclization at sulfur to give 1-benzothiophenes. The results were discussed by the nature of sulfur.
NEW “Pd / ULTRA-THIN AMORPHOUS-OXIDE LAYER /ZSM-5” CATALYSTS FOR SELECTIVE FORMATION OF PROPANE FROM CO/H2
Authors: Kase Akira , Asakura Kiyotaka , Egawa Chikashi , Iwasawa Yasuhiro
Published: July 2006

Among new three types of “Pd / ultra-thin amorphous-oxide(La2O3, SiO2, or TiO2) layers / ZSM-5” catalysts, prepared by a two-stage attaching technique, the La2O3-coated ZSM-5 -supported Pd catalyst was found to be a selective catalyst for propane formation (68%) from CO and H2 at 543 K and 1.01 MPa.
CHEMICALLY PREPARED POLY(N-METHYLPYRROLE) THIN FILM. ITS APPLICATION TO THE FIELD-EFFECT TRANSISTOR
Authors: Tsumura Akira , Koezuka Hiroshi , Tsunoda Sei , Ando Torahiko
Published: July 2006

A thin film of poly(N-methylpyrrole) has been prepared by a chemical method. The chemical structure of the polymer resembles that of the electrochemically prepared one. A fild-effect transistor has been fabricated utilizing the polymer as a semiconducting material.
CRYSTAL STRUCTURE OF α′-(BEDT-TTF)2BrICl
Authors: Kobayashi Hayao , Kato Reizo , Kobayashi Akiko , Saito Gunzi , Tokumoto Madoka , Anzai Hiroyuki , Ishiguro Takehiko
Published: July 2006

Crystal of the semiconducting salt of α′-(BEDT-TTF)2BrICl has a modified structure of metallic α-(BEDT-TTF)2I3. Unlike the molecules in α-(BEDT-TTF)2I3, all the molecules are on the general positions. The average molecular planes of two crystallographically independent BEDT-TTF molecules are not parallel. The dihedral angle between them is 48°. A two-dimensional sulfur network is formed by the intermolecular short S···S contacts.
THE REACTION OF 2,2-DIMETHYL-4-LITHIO-1,3-OXATHIANE 3,3-DIOXIDE. GENERAL SYNTHESIS OF γ-HYDROXYKETONES
Authors: Fuji Kaoru , Node Manabu , Usami Yoshihide
Published: July 2006

Reactions of 2,2-dimethyl-4-lithio-1,3-oxathiane 3,3-dioxide (2) with alkyl halides and carbonyl compounds proceed smoothly to give 4-substituted heterocycles. A general synthesis of γ-hydroxyketones from aldehydes utilizing 2 is described.
SYNTHESIS OF trans-(DICHLOROMETHYL)BIS(2,4-PENTANEDIONATO)(AQUA, PYRIDINE, OR METHANOL)CHROMIUM(III) AND CRYSTAL STRUCTURE OF trans-(DICHLOROMETHYL)BIS(2,4-PENTANEDIONATO)PYRIDINECHROMIUM(III)
Authors: Shoji Masato , Shimura Makoto , Ogino Hiroshi , Ito Tasuku
Published: July 2006

The complexes, [Cr(CHCl2)(acac)2L] (L = H2O, CH3OH, and pyridine), were prepared, where acac− denotes 2,4-pentanedionate ion. [Cr(CHCl2)(acac)2(CH3OH)] reacts with pyridine(py) rapidly to give [Cr(CHCl2)(acac)2(py)]. The structure of [Cr(CHCl2)-(acac)2(py)] has been determined to be trans by single crystal X-ray diffraction. The Cr–N(py) bond lengthens to 2.16(1) Å. This may be associated with that rapid substitution reaction.
Photocatalytic Reduction of NO3− to Form NH3 over Pt–TiO2
Authors: Kudo Akihiko , Domen Kazunari , Maruya Ken-ichi , Onishi Takaharu
Published: July 2006

Photocatalytic reduction of NO3− to form NH3 and the simultaneous evolution of O2 were observed over Pt–TiO2 in aqueous nitric acid and sodium nitrate solutions.
Substituent Effect on the Stability of Benzyl Cation in the Gas Phase
Authors: Mishima Masaaki , Arima Kiyoshi , Usui Satoshi , Fujio Mizue , Tsuno Yuho
Published: July 2006

Chloride ion affinities of substituted benzyl cations in the gas phase have been determined by means of an ICR mass spectrometer. The substituent effect has been analyzed in terms of the LArSR Eq., giving a ρ=13.6 and an r+=1.31.
A General Synthesis of cis Perhydro 3,6-Isoquinolinediones Related to the Alloyohimbane Alkaloids
Authors: Stork Gilbert , Livingston Douglas A
Published: July 2006

The intramolecular annulation of malonic acid derivatives of 4-aminomethyl cyclohexenones is shown to be an efficient route to 3,6-diketoderivatives of cis perhydroisoquinolines.
Trityl Salts Catalyzed Aldol-Type Reaction of Alkyl Enol Ethers with Acetals
Authors: Murakami Masahiro , Minamikawa Hiroyuki , Mukaiyama Teruaki
Published: July 2006

β-Alkoxy ketones are synthesized in good yields by the reaction of alkyl enol ethers with acetals in the presence of a catalytic amount of trityl salts. Of enol ethers, methoxymethyl (MOM) enol ether exhibits an enhanced reactivity as a nucleophile.
A Pt/Alumina Catalyst Coated on Aluminum Thin Plate for Oxidation Reaction on Heat Transfer Surface
Authors: Hashioka Tohru , Kosedo Shinji , Itoh Mami , Yamamoto Kyoko , Kameyama Hideo , Kabe Toshiaki
Published: July 2006

In order to give catalytic activity to heat transfer surface, aluminum plate was treated by anodization, γ-alumina coating and Pt-impregnation. Prepared catalysts showed a substantial activity for the oxidation of acetone and also showed good thermal conductivity.
The Reaction of Germanium Atoms with Organic Halides
Authors: Mochida Kunio , Tashiro Kumiko
Published: July 2006

Co-condensation of thermally evaporated germanium vapor with organic halides yields a mixture of trihalogermyl derivatives and tetrahalogermanes as major products. The nature of these reactions is discussed.
Novel Transient Absorption of Irradiated DMSO in Carbon Tetrachloride as Studied by Pulse Radiolysis
Authors: Sumiyoshi Takashi , Katayama Meiseki
Published: July 2006

Transient absorption spectra with a maximum at 400 nm have been observed in the pulse radiolysis of dimethyl sulfoxide in carbon tetrachloride solutions. The transients are attributed to the complexes formed in reaction of chlorine atom with dimethyl sulfoxide based on spectral and kinetic studies.
Cis and Trans Isomers of Iodonitrosylbis(vicinal-dioximato)ruthenium(III)
Authors: Fukuchi Takashi , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatsujiro
Published: July 2006

The mixture of cis and trans isomers of [Rul(Hdmo)2(NO)] (H2dmo = 2,3-butanedione dioxime) or [RuI(Hdpo)2(NO)] (H2dpo = 1,2-diphenylethanedione dioxime) was prepared, and the isomers were separated with a silica-gel column. The cis isomers together with the trans isomers were identified by the 1H and 13C NMR, and IR data.
Pyridinium Chlorochromate in Organic Synthesis. A Facile and Selective Oxidative Cleavage of Enol Ethers
Authors: Baskaran S , Islam I , Raghavan Malini , Chandrasekaran S
Published: July 2006

Pyridinium chlorochromate (PCC) has been found to be selective reagent for the oxidative cleavage of enol ethers to esters or keto lactones in high yields.
Nucleophilic Substitution of Aromatic Halides with Amines under High Pressure
Authors: Ibata Toshikazu , Isogami Yasushi , Toyoda Jiro
Published: July 2006

The reaction of aromatic chlorides, bromides and iodides with various primary or secondary amines in a tetrahydrofuran solution under high pressure of 6–12 kbar gave the corresponding secondary and tertiary aromatic amines. The yields of the products depend on the bulkiness of amines used. 1,4-Diazabicyclo[2.2.2]octane and quinuclidine gave N-aryl quarternary ammonium halides in high yields in contrast to the low reactivity of acyclic tertiary amines.
Regioselective 6-Arylation of 5,8-Quinolinedione with N-Alkyl-and N,N-Dialkyl-anilines Promoted by Metal Ions
Authors: Yoshida Katsuhira , Ishiguro Miwa , Honda Hiroyuki , Kubo Yuji
Published: July 2006

The reaction of 5,8-quinolinedione (1) with N,N-dialkylanilines in acetic acid was strongly promoted by some metal ions to give selectively the 6-arylated products, 6-(4-N,N-dialkylaminophenyl)-5,8-quinolinediones. With N-alkylanilines the reaction gave a mixture of the 6-aminated and 6-arylated products of 1.
Regio- and Stereoselective Synthesis of (E)- and (Z)-Vinylic Sulfones and Their Conversion to the Corresponding Allylic Sulfones
Authors: Kobayashi Toshifumi , Tanaka Yuhji , Ohtani Takashi , Kinoshita Hideki , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

(E)- and (Z)-vinylic sulfones were prepared regio- and stereoselectively from 1-alkenes or 1-alkynes in high yields via iodosulfonization in AcOEt-H2O. The vinylic sulfones thus prepared were converted to the corresponding allylic sulfones by treatment with DBU. Stereochemistry of the conversion was discussed.
Synthesis of Optically Active Inositol Derivatives Starting from d-Glucurono-6,3-lactone
Authors: Watanabe Yutaka , Mitani Motohiro , Ozaki Shoichiro
Published: July 2006

d-Glucurono-6,3-lactone was converted to optically active and partially protected inositols. The synthetic strategy involves an efficient conversion of the d-gluco configuration to the l-ido configuration and reductive cyclization of dials to cyclitols.
Preparation of Graphite Intercalation Compound of Niobium Fluoride in Fluorine Atmosphere
Authors: Nakajima Tsuyoshi , Okahara Kenji , Padma Doddaballapur K , Watanabe Nobuatsu
Published: July 2006

The 1st stage intercalation compound of graphite with niobium fluoride has been prepared in fluorine gas of 101 kPa. The composition is C8−10NbF6−7 with repeat distance of 0.818–0.834 nm. The highest electrical conductivity is 1.2×105 S cm−1 at stage 2+3.
Synthesis of 3-(4-Cyclopentene-1,3-dione-2-ylidene)-6-(diphenylmethylene)cyclohexadienes as Novel p-Quinodimethanes Stabilized by Antiaromaticity of Cyclopentadienone
Authors: Toda Mitsuo , Hattori Makiko , Okada Keiji , Oda Masaji
Published: July 2006

Title compounds, whose polarization is decreased by antiaromaticity of cyclopentadienone, have been synthesized through a novel Rh(II)-catalyzed arylation of cyclic 2-diazo-1,3-diones.
A New Propargylic Rearrangement of Acetylenic Alcohols by P4S10. A New Preparative Method for Monothio-α-diketone
Authors: Toda Fumio , Tokunaga Yasuyuki
Published: July 2006

Treatment of acetylenic alcohols with phosphorus pentasulfide P4S10 at room temperature gave thioketones. Similarly, treatment of acetylenic alcohol having a carbonyl group on its acetylenic carbon gave monothio-α-diketone. It was clarified that four sulfur atoms of P4S10 are involved in the reaction.
Template Synthesis of Copper (II) Complex with Tetraaza Macrocycle in Solid Phase
Authors: Fujiwara Manabu , Kinoshita Setsuko , Wakita Hisanobu , Matsushita Takayuki , Shono Toshiyuki
Published: July 2006

The ethylenediamine adduct of bis(3-nitro-2,4-pentanedionato) copper (II) was prepared in ethanol, and characterized by spectroscopic and elemental analyses. The thermal reaction of the adduct in the solid phase resulted in the formation of a tetraaza macrocyclic copper(II) complex by the intramolecular condensation.
Preparation of Molybdenum Intercalated Tantalum Disulphide MoxTaS2
Authors: Saeki Masanobu , Onoda Mitsuko
Published: July 2006

Molybdenum intercalated tantalum disulphides have been prepared from the elements at 1350 °C. The crystal structures of the compounds were found to be dependent on the amount of intercalated molybdenum atoms. The structures were type Is at x=0 in MoxTaS2 type 3s at x=1/9, and type 2s at x=1/5. There was no evidence of ordered distribution of molybdenum atoms in the layers.
Biosynthesis of Phytuberin
Authors: Murai Akio , Yoshizawa Yuko , Miyazaki Hiroshi , Masamune Tadashi , Sato Norio
Published: July 2006

Feeding experiments with (±)-[8,8-2H2]solavetivone in diseased potato tuber tissues indicated that phytuberin, one of the most representative phytoalexins in the Solanaceae, was biosynthesized from solavetivone.
Selective Destruction of the Synthetic Vesicles by the Reductive Cleavage of Disulfide Linkage
Authors: Chang Suk-Kyu , Kim Duck-Hee , Kim Nam-Yee , Cho Iwhan
Published: July 2006

A series of dialkyl disulfide surfactants were prepared by the reaction of different aliphatic amines with S-acetylmercaptosuccinic anhydride followed by the oxidation with iodine. Selective destruction of the vesicles formed by the above surfactants were successfully performed by the reductive. cleavage of dialkyl disulfide to its monoalkyl thiol surfactants with various mercaptans.
Observation of Silicon-29 Lanthanoid-Induced Shifts and Its Use for Estimates of Equilibrium Constants for the Complex of an Organosilane with a Lanthanoid Shift Reagent
Authors: Hirayama Masatoshi , Arai Juichi
Published: July 2006

On the successive addition of Pr(fod)3(L) to a 0.53 M CDCl3 solution of diethoxydimethylsilane(S) at 25 °C, the large lanthanoid-induced 29Si shifts were observed and analyzed in terms of the least squares fits to one step equilibrium between L and S to estimate the intrinsic shift of the 1:1 complex and the equilibrium constant.
Structural Features of the Radicals Leached out of a Plasma-Driven Ultrathin Film in Molecular Weight Terms
Authors: Kuzuya Masayuki , Nakanishi Masaharu , Tanaka Yoshizumi
Published: July 2006

Structural features of the radicals leached out of a plasma-driven ultrathin film in molecular weight terms were presented based on the permeability of such radicals to initiate the aqueous solution-polymerization of acrylic acid on the specially designed experiment.
Preparation of Trifluoromethylated Compounds by Anodic Oxidation of 3-Hydroxy-2-trifluoromethylpropionic Acid
Authors: Kubota Toshio , Aoyagi Ryouji , Sando Hidehiro , Kawasumi Masashi , Tanaka Tatsuo
Published: July 2006

Electrochemical Oxidation of 3-hydroxy-2-trifluoromethylpropionic acid(1) produced 2,3-bis (trifluoromethyl)-1,4-butanediol in quantitative yield. Furthermore, 2-trifluoromethylated alcohols were obtained by the crossed Kolbe reaction of 1 with carboxylic acids or dicarboxylic acid mono esters.
Ring Expansion through [2+2] Photocycloaddition–β-Scission Sequence. Two Carbon Ring Expansions of β-Indanone and β-Tetralone
Authors: Suginome Hiroshi , Itoh Masahito , Kobayashi Kazuhiro
Published: July 2006

We describe a new method for two carbon ring expansions of 5-and 6-membered rings of β-indanone and β-tetralone through the [2+2] photocycloaddition of the enol ethers of the cyclic ketones followed by the radical cleavage of the fused bond of the cyclobutanols derived from the adducts.
Organic Substrates Producing a Dual-Frequency Belousov–Zhabotinskii Oscillating Reaction
Authors: Tsukada Masao
Published: July 2006

Four organic substrates, acetoacetic acid methyl ester, 4-chloroacetoacetic acid ethyl ester, acetonedicarboxylic acid diethyl ester, and N-methylacetoacetamide, have been found to generate dual-frequency oscillations in the Belousov–Zhabotinskii type reaction system.
Crystal Structure of (−)500CD-mer-(3-Azapentane-1,5-diamine)(ethylenediamine-N-acetato)cobalt(III) Bromide
Authors: Okamoto Ken-ichi , Yasui Takaji , Hidaka Jinsai
Published: July 2006

The crystal structure and absolute configuration of the title complex, (−)500CD-mer-[Co(edma)(dien)]Br2, was determined by X-ray diffraction study. There are three crystallographically independent complex cations in an asymmetric unit. All of them, in which the terdentate ligands coordinate meridionally, have a δ spiral configuration and the asymmetric nitrogen donor atoms of the edma take an S configuration.
Highly Diastereoselective Synthesis of Aminoalcohols of Ephedrine Type
Authors: Solladie-Cavallo Arlette , Dreyfus Anne-Claire , Sanch François , Klein Arlette
Published: July 2006

Analogs of ephedrine are obtained in 80% yield in 3 steps from chiral arenechromium tricarbonyl complexes. Hence optically pure complexes afford optically pure analogs of ephedrine.
Photo-Rearrangement of Polychlorobenzenes meta-Migration of Chlorine Atom
Authors: Morisaki Kenji , Miura Yasuki , Abe Kazuhisa , Hirota Minoru , Nakada Masahiro
Published: July 2006

Several polychlorobenzenes were irradiated by ultraviolet light (254 nm) in acetonitrile and the products were determined by gas chromatography. In addition to the abstraction of hydrogen atom from the solvent, photo-isomerization was shown to proceed giving isomeric polychlorobenzenes one of which chlorine atoms migrated to meta to the original position. The meta-rearrangement was rationalized by an MNDO calculation on o-chlorophenyl free radical.
Determination of Trace Iron in Raw Materials Used for Fluoride Glass Fibers by Neutron Activation Analysis
Authors: Kobayashi Kenji
Published: July 2006

Trace iron in seven kinds of raw materials used for fluoride glass fibers was determined by neutron activation analysis. Substoichiometric neutron activation analysis of iron in (NH4)2ZrF6, ZrF4, and BaF2 and instrumental neutron activation analysis of iron in YF3, LaF3, AlF3, and NaF were carried out. Iron concentration in sublimated ZrF4, BaF2, YF3, and LaF3 was in the 11–76 ng g−1 range.
2,4,6-Trisubstituted Phenols as Cooperative Carriers in Crown-ether Mediated Extraction and Transport of Cations
Authors: He Gong-Xin , Ishii Izumi , Kurita Mayumi , Kikukawa Kiyoshi , Matsuda Tsutomu
Published: July 2006

Trisubstituted phenols having two bulky groups at 2,6-position and pKa value below 7 proved to be good cooperative carriers in solvent extraction and liquid membrane transport of alkali-metal cations with crown ethers.
Separation of Cyclohexanol and Cyclohexanone by Complexation with 1,1-Di(p-hydroxyphenyl)cyclohexane and 1,1,6,6-Tetraphenylhexa-2,4-diyne-1,6-diol, and Crystallographies Structural Studies of the Complexes with the Former Host Compound
Authors: Goldberg Israel , Stein Zafra , Kai Akihiro , Toda Fumio
Published: July 2006

An efficient separation of cyclohexanol and cyclohexanone by selective complexations with the title host compounds has been achieved. Crystallographic analyses of the corresponding 1:1 complexes with the cyclohexane host derivative show a characteristic structure type which is dominated by continuous arrays of hydrogen bonds
Preparation of Superconducting YBa2Cu3O7−δ Thin Films by the Dipping-Pyrolysis Process Using Organic Acid Salts
Authors: Kumagai Toshiya , Yokota Hiroshi , Kawaguchi Kenji , Kondo Wakichi , Mizuta Susumu
Published: July 2006

Thin films of the superconductor YBa2Cu3O7−δ (YBCO) were prepared on yttria stabilized zirconia (YSZ) substrates by the dipping-pyrolysis process. The starting solution, produced by dissolving barium and copper naphthenates and yttrium stearate into an organic solvent, was coated on the substrates and heated up to 800 °C. Resistivities of the films were measured by the four probe method and superconduction was observed at Tc = 90 K (onset) and 60 K (end).
Improvement of Mechanical Properties of Metaphosphate Glass by Addition of Chromium Oxide
Authors: Yoshimoto Mamoru , Soga Naohiro
Published: July 2006

The mixed alkaline earth metaphosphate glasses containing various amounts of Cr2O3 were prepared, and their mechanical properties were measured. With the addition of Cr2O3, Young’s modulus was improved from 60 to 120 GPa, Vickers hardness from 4 to 8 GPa, and toughness from 0.6 to 1.1 MPa m1⁄2. This improvement was attributed to the change of glass structure from the linear chain and/or ring structure of metaphosphate glass to the three dimensional structure.
The Michael Reaction of O-Silylated Ketene Acetals with α,β-Unsaturated Esters Promoted by a Catalytic Amount of Aluminum Triflate
Authors: Minowa Nobuto , Mukaiyama Teruaki
Published: July 2006

The Michael reaction of O-silylated ketene acetals with α,β-unsaturated ester in the presence of a catalytic amount of aluminum triflate proceeds smoothly under mild conditions to afford the corresponding glutarates in good yields.
Syntheses and Characteristics of Naphthoquinone Methide Near Infrared Dyes for Optical Storage Media
Authors: Kubo Yuji , Mori Fujio , Yoshida Katsuhira
Published: July 2006

New type of naphthoquinone methide near infrared dyes have been synthesized by condensing 1-naphthylmalononitrile or 1-naphthylcyanoacetamide with p-N,N-dialkylaminoaniline hydrochlorides in the presence of oxidizing agents. These dyes can absorb near infrared light at 722–761 nm in chloroform and have excellent characteristics for the practical use as diode-laser optical storage media.
Titanium(IV)-Chloride-Catalyzed Reactions of Rotameric 3-(1,4-Dimethoxy-9-triptycyl)-3-methylbutanoyl Chloride. Isolation of Two Rotameric Ketones and Competition between Cyclization and Lactone Formation
Authors: Oki Michinori , Tanaka Toshimasa , Yamamoto Gaku
Published: July 2006

The ap isomer of the title compound afforded a ketone as a sole product, whereas the sc isomer did a ketone and a lactone that is produced by the attack of the acylium cation on the 1-methoxy-oxygen. The ketone from the ap isomer was different from that obtained from the sc acid chloride. The barrier to isomerization of the ap-ketone to the sc was 30 kcal mol−1 at 100 °C.
Ba Doped Cerium Oxides Active for Oxidative Coupling of Methane
Authors: Otsuka Kiyoshi , Shimizu Yasuo , Komatsu Takayuki
Published: July 2006

Among the alkali or alkaline earth metal doped CeO2 catalysts examined, Ba doped CeO2 (Ba/CeO2) was the most active catalyst for oxidative coupling of CH4. C2-STY for the Ba/CeO2 reached 0.95 mol g−1 h−1 , under the reaction conditions; T=1023 K, P(CH4)=73 kPa, P(O2)=28 kPa, and W/F=6.1×10−4 g h l−1. A compound oxide, BaCeO3, formed in the Ba/CeO2 is the active species for the reaction.
A Simple Method for Generation of Thiocarbonyl Ylides and Their Regioselective 1,3-Cycloadditions
Authors: Aono Masahiro , Terao Yoshiyasu , Achiwa Kazuo
Published: July 2006

Thioketone S-methylides were generated from thioketones and (trimethylsilyl)methyl triflate, and underwent 1,3-cycloaddition with thioketones to give 1,3-dithiolanes.
Synthesis of Al2O3-coated TiO2 Composite Powder by Homogeneous Precipitation Method
Authors: Kim Byung-Kwan , Yasui Itaru
Published: July 2006

Al(OH)3-coated TiO2 composite powder was prepared from the aqueous solution of Al2(SO4)3 and rutile powder by the homogeneous precipitation method using urea, then heat treated at 1200 °C for 1 h in order to convert it to α-Al2O3-coated TiO2 powder.
Palladium Catalyzed Reactions of Organic Halides with Organotin Compounds Involving Insertion of Norbornene. Synthesis of 2,3-Disubstituted Norbornane
Authors: Kosugi Masanori , Tamura Hiroyuki , Sano Hiroshi , Migita Toshihiko
Published: July 2006

2,3-Disubstituted norbornenes were prepared by the palladium catalyzed reaction of a ternary system composed of organic halide, organotin compound, and norbornene. Aryl and vinyl bromides, and acyl chloride were good substrates, but benzyl and allyl chlorides were not. Vinyl, phenyl, ethynyl, and allyltin compounds were utilizable reagents.
A Convenient Method for the Preparation of Secondary Propargylic Ethers. The Reaction of Acetals with 1-Trimethylsilylalkynes Promoted by the Combined Use of Catalytic Amounts of Tin(IV) Chloride and Zinc Chloride
Authors: Hayashi Masaji , Inubushi Atsuro , Mukaiyama Teruaki
Published: July 2006

In the coexistence of catalytic amounts of SnCl4 and ZnCl2, acetals undergo a coupling with 1-trimethylsilylalkynes in good yields to give secondary propargylic ethers, which are also directly produced from aldehydes by the reaction with alkoxytrimethylsilanes and 1-trimethylsilylalkynes under the same conditions.
Diastereoselective Synthesis of erythro- and threo-2-Hydroxy-2,3-dialkyl-4-alkenoic Acids by the Ester Enolate Claisen Rearrangement of Allyl 2-Hydroxyalkanoates
Authors: Sato Toshio , Tanaka Akihiko , Tajima Kazuhisa , Fujisawa Tamotsu
Published: July 2006

The ester enolate Claisen rearrangement of (E)- and (Z)-allyl 2-hydroxyalkanoates diastereoselectively gives erythro- and threo-2-hydroxy-2,3-dialkyl-4-alkenoic acids, respectively.
13C-CP-MAS NMR and 57Fe-Moessbauer Spectroscopic Studies of the Reaction Products of Ferrocene Derivatives with Mercury(II) Halides
Authors: Watanabe Masanobu , Masuda Yuichi , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

Adducts of ferrocene, biferrocene, and [2]ferrocenophane with HgX2 (X = Cl, Br, I) were studied by means of high resolution solid state 13C-NMR and 57Fe-Moessbauer spectroscopies. Large low-field shifts found in the 13C-CP-MAS NMR and large quadrupole splitting (Q. S.) values in the 57Fe-Moessbauer spectroscopies suggest the presence of a direct chemical bonding between the Fe and Hg atoms.
Preparation of (Triphenylsilyl)allyl Anion and (Triphenylgermyl)allyl Anion from 1-Propenyltriphenylsilane and 1-Propenyltriphenylgermane and Their Reactions with Electrophiles
Authors: Wakamatsu Kuni , Oshima Koichiro , Utimoto Kiitiro
Published: July 2006

Treatment of 1-propenyltriphenylsilane with n-BuLi in THF-HMPA provides (triphenylsilyl)allyl anion which is identical with an anion derived from 2-propenyltriphenylsilane and base. Generation of (triphenylgermyl)allyl anion is also described. Addition of alkyl halides or carbonyl compounds to these anions gives the corresponding adducts regioselectively.
Regioselective Photoallylation of Furyl and Thienyl Dicyanoethenes by Allylic Stannanes via Photoinduced Electron Transfer
Authors: Mizuno Kazuhiko , Toda Susumu , Otsuji Yoshio
Published: July 2006

Irradiation of 1,1-dicyano-2-(2-furyl)ethene and allyltributylstannane in the presence of phenanthrene in aqueous acetonitrile afforded regioselectively 5,5-dicyano-4-(2-furyl)-1-pentane. Photoreactions of the other furyl and thienyl dicyanoethene derivatives with allylic stannanes gave the corresponding allylic products in good yields.
Transchlorination of o-Dichlorobenzene and Benzene into Chlorobenzene
Authors: Shinoda Kiyonori
Published: July 2006

The transchlorination of o-dichlorobenzene (o-DCB) and benzene into chlorobenzene (CB) was carried out in the presence of catalyst at 400 °C. o-C6H4Cl2 + C6H6 = 2 C6H5Cl Noble metal chloride supported on activated charcoal promoted remarkably the transchlorination.