bluuebunny/crossref_metadata_2025 huggingface dataset:
Formation of C3 Hydrocarbons from Methane Catalyzed by Na+ Doped ZrO2
Authors: Matsuhashi Hiromi , Sakurai Kenji , Arata Kazushi
Published: May 2006

Sodium doped ZrO2 was studied as the methane activation catalyst and found to be highly active at low temperature giving C3 hydrocarbons as main products. Among the catalysts tested, 4.3 mol% Na+ doped ZrO2 showed the best conversion (18.2%) and selectivity (59.0%) for the formation of C2 and C3 hydrocarbons at 873 K; the yield of C3 was 7.5% with ratio 3.3 of propane/propene.
Friedel–Crafts Alkylation of Phenylsilanes with α-Chloro Sulfides
Authors: Ishibashi Hiroyuki , Sakashita Hiroshi , Morita Satoko , Mitani Sumiyo , Ikeda Masazumi
Published: May 2006

Treatment of trimethylphenylsilane with methyl chloro(methylthio)acetate in the presence of atannic chloride gave a mixture of the alkylated silylbenzenes, in which the meta- and para-substituted products predominated. The partial rate factors of this reaction suggest that the trimethylsilyl group slightly activates the meta- and para-positions of the silylbenzene.
1,4-Addition of Diisobutylaluminium Benzenetellurolate to α,β-Unsaturated Carbonyl Compounds and Aldol Reaction of Resulting Aluminium Enolates
Authors: Sasaki Kazuaki , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: May 2006

Diisobutylaluminium benzenetellurolate, prepared from diphenyl ditelluride and diisobutylaluminium hydride, easily added to α,β-unsaturated carbonyl compounds in 1,4-fashion to give β-phenyltelluro carbonyl compounds. The intermediate aluminium enolates reacted with aldehydes to give aldol adducts. Subsequent telluroxide elimination resulted in the formation of α-substituted α,β-unsaturated carbonyl compounds.
Free-Radical Approach to C–C Bond Formation on a Trifluoromethyl-Substituted Carbon. Intramolecular Cyclization
Authors: Morikawa Tsutomu , Uejima Masayuki , Kobayashi Yoshiro
Published: May 2006

A trifluoromethyl-substituted carbon radical, generated by radical deoxygenation of α-trifluoromethyl alcohol, intramolecularly formed C–C bond to give a five- or six-membered cyclic compound.
Microbial Asymmetric Oxidation of 2-Alkoxyethylsulfides and a Facile Synthesis of Chiral Vinyl Sulfoxide
Authors: Ohta Hiromichi , Matsumoto Shinsuke , Okamoto Yasushi , Sugai Takeshi
Published: May 2006

2-Alkoxyethyl phenyl sulfides were oxidized by incubation with Rhodococcus equi IFO 3730 to afford chiral sulfoxides of high enantio excess. Phenyl vinyl sulfoxide and 2-hydroxyethyl phenyl sulfoxide were obtained from microbial oxidation products without any loss of their optical purities.
Uphill and Selective Transport of Thiocyanate Ion through a Bulk Liquid Membrane Containing Ferric Tetraphenylporphyrin Complex as a Mobile Carrier
Authors: Kokufuta Etsuo , Sumi Katsuhiro , Wu Wen-Chin
Published: May 2006

Ferric complex of tetraphenylporphyrin is useful as a carrier for preparing a bulk liquid membrane system in which SCN− ion is selectively transported against its concentration gradient by coupling with the flow of OH− ion coming from the opposite direction.
The Formation of an Alternating Zigzag and Linear Chain Structure with Topochemical Induction into the Racemate Crystal
Authors: Hasegawa Masaki , Kunita Akira , Chung Chanmoon , Hayashi Keiichi , Sato Sadao
Published: May 2006

Methyl and ethyl α-cyano-4-[2-(2-pyridyl)ethenyl]cinnamate crystals were highly photoreactive and formed the cycloadduct having an alternating zigzag and linear chain structures accompanied with topochemical induction of the two chiralities alternatively in the chain from the β-type achiral crystal of prochiral molecules.
On the Symmetry of SbIIIBr63− and SbVBr6− Ions in the (NH4)4SbIIISbVBr12 Crystal. A Study of 81Br NQR Zeeman Effect
Authors: Terao Hiromitsu , Okuda Tsutomu
Published: May 2006

The single-crystal Zeeman effect was investigated for the 81Br NQR lines in the mixed-valence compound (NH4)4SbIIISbvBr12 at room temperature. Comparing with the results of X-ray analysis, it was concluded that the SbIIIBr63− ions possess D2d symmetry and the SbvBr6− ions possess D4h (nearly Oh) symmetry.
A New Generation of o-Quinone Methides from o-(1-(Alkylthio)alkyl)phenols under Mild Conditions
Authors: Inoue Tsutomu , Inoue Seiichi , Sato Kikumasa
Published: May 2006

o-(1-(Alkylthio)alkyl)phenols are converted into o-quinone methides in good yield by treatment with silver oxide under mild conditions. Since the methides tend to prefer (E) configuration, cis-4-alkyl-2-alkoxychromans are exclusively obtained as a result of endo [4+2] cycloaddition of the methides and vinyl ethers.
p-Anisyloxymethyl Group, a Novel Oxidatively Removable Acetal Type OH-Protecting Group
Authors: Masaki Yukio , Iwata Ikuhiro , Mukai Isao , Oda Hirohisa , Nagashima Hiromu
Published: May 2006

Protection of various types of alcohols with p-anisyloxymethyl (p-AOM) chloride gave the corresponding p-AOM ethers which were deprotected with ceric ammonium nitrate efficiently. Chemoselective removal either of p-AOM group or of tetrahydropyranyl group is also reported.
Reversible Binding of Acetylene to Cationic Cobalt(III) Octaethylporphyrin
Authors: Setsune Jun-ichiro , Ikeda Mitsuhiro , Ishimaru Yoshihiro , Kitao Teijiro
Published: May 2006

Acetylene is reversibly inserted into a Co–N bond of bis(aquo)octaethylporphyrinatocobalt(III) perchlorate, (OEP)CoIII(H2O)2ClO4 (1), in CH2Cl2 solution, generating a d6 high spin (S = 2) complex. Addition of 2,6-lutidine to a mixture of 1 and acetylene gave a σ-vinylcobalt(III) complex, (OEP)CoIII–CH=CH–L+ClO4 [L = 2,6-lutidine], whereas pyridine replaced the acetylene ligand to afford (OEP)CoIII(PY)2ClO4. These results suggest the intermediacy of a CoIII acetylene π-complex.
Aromatization of Lower Paraffin with Hybrid Catalysts Containing ZSM-5
Authors: Fujimoto Kaoru , Nakamura Ikusei , Yokota Kohshiroh
Published: May 2006

It was pointed out that Ga promote the zeolite-promoted aromatization of lower paraffin by “Reverse Spillover Effect” of hydrogen. A new hybrid catalyst which was comparable to Ga-ZSM-5 for the title reaction was developed on this concept.
Synthesis of Statine and Its Analogues
Authors: Yanagisawa Hiroaki , Kanazaki Takuro , Nishi Takahide
Published: May 2006

Statine, (3S,4S)-4-amino-3-hydroxy-6-methylheptanoic acid, and its analogues were prepared from 5,6-anhydro-3-deoxy-1,2-O-isopropylidene-d-glucofuranose. The key step is the stereospecific reaction of the epoxy sugar with the Grignard reagent.
Hydroacylation of Simple Alkyl Vinyl Ketones Using Organotetracarbonylferrates
Authors: Yamashita Masakazu , Tashika Haruyoshi , Suemitsu Rikisaku
Published: May 2006

Alkyl vinyl ketones were hydroacylated by organotetracarbonylferrates to the corresponding 1,4-diketones in good yields in dipolar aprotic solvents such as dimethylacetamide. The addition of 18-Crown-6 made an increase of the yields.
Ozonolysis of Uracils in Water
Authors: Matsui Masaki , Nakazumi Hiroyuki , Kamiya Kazusaki , Yatome Chizuko , Shibata Katsuyoshi , Muramatsu Hiroshige
Published: May 2006

The ozonolysis of uracils unsubstituted at the 1-position gave new 1-acyl-5-hydroxyhydantoins and 5-hydroxyhydantoins in water, while that of 1-substituted uracils gave the corresponding 5-hydroxyhydantoins in low yields. The structure of 1-acetyl-5-hydroxy-5-methylhydantoin was determined by X-ray crystallography.
Cleavage of the Imino Bonds of Validoxylamine A Derivatives with N-Bromosuccinimide
Authors: Ogawa Seiichiro , Miyamoto Yasunobu , Nakajima Akihiro
Published: May 2006

Reaction of validoxylamine A derivatives with N-bromosuccinimide in aqueous N,N-dimethylformamide resulted in a cleavage of the imino bonds to give rise to synthetically useful protected derivatives of (+)-validamine and valienamine, and the cyclohexanone and -hexenone derivatives.
Preparation of Poly(2,5-thienylene-vinylene) Film by Hydrogen Transfer Reaction
Authors: Iwatsuki Shouji , Kubo Masataka , Yamashita Hideki
Published: May 2006

A tough film of fully conjugated poly(2,5-thienylene-vinylene) was successfully prepared by hydrogen transfer reaction in dioxane from poly(2,5-thienylene-ethylene) film obtained in the vapor deposition process with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an oxidizing reagent.
Redox Properties of a Series of Iron(III) Trinuclear Carboxylates, [Fe3(μ3-O)(μ-RCO2)6(L)3]n+
Authors: Nakata Kou , Nagasawa Akira , Sasaki Yoichi , Ito Tasuku
Published: May 2006

Seventeen trinuclear iron(III) carboxylate complexes, [Fe3(μ3-O)(μ-RCO2)6(L)3]n+ (n = 1 or 7; RCO2 = simple carboxylate, pyridine carboxylic acid, or amino acid; L = H2O, pyridine, or imidazole) gave two reduction peaks in cyclic voltammogram in CH3CN. The first reversible redox potential (E1/2 = +0.23 to −0.60 V vs. Ag/Ag+ electrode) has a good linear correlation with pKa (1.5–4.8) of the bridging carboxylate ligand.
Remarkable Solvent Effects on the Photocatalytic Behavior of [fac-Re(bpy)(CO)3Br] (bpy = 2,2′-bipyridine). Selective Hydrogen Evolution in Ether Solvents in the Presence of Triethylamine
Authors: Pac Chyongjin , Ishii Koichiro , Yanagida Shozo
Published: May 2006

Irradiation of [fac-Re(bpy)(CO)3Br] and triethylamine in tetrahydrofuran at > 400 nm results in the catalytic H2 evolution without the CO2 reduction to CO, while the CO2 reduction occurs with little H2 evolution in N,N-dimethylformamide and acetonitrile.
Dimensionality Examination of Cation Radical Salts Based on EDT-TTF (EDT-TTF = Ethylenedithiotetrathiafulvalene)
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko
Published: May 2006

Crystal and electronic structures of organic conductors, (EDT-TTF)2X (EDT-TTF = ethylenedithiotetrathiafulvalene; X = PF6, AsF6, TaF6, BF4, ClO4, ReO4, Au(CN)2), have been studied. In all these compounds, the donor molecules exhibit face-to-face stacking. Simple tight-binding band calculations indicate quasi-one-dimensional electronic structures.
Aldol Addition Reaction of Chiral Acetylurea and a Convenient Synthesis of Optically Pure Methyl β-Alkyl-β-hydroxypropionate
Authors: Kishikawa Keiki , Yamamoto Makoto , Kohmoto Shigeo , Yamada Kazutoshi
Published: May 2006

The aldol addition reaction of chiral acetylurea with aldehydes diastereoselectively gives β-alkyl-β-hydroxypropionyl-ureas (3 and 4) and the methanolysis of the adducts 3 and 4, separated perfectly by conventional column chromatography on silica gel, gives the corresponding optically pure methyl β-alkyl-β-hydroxypropionates.
Triethylgallium Mediated Lactamization of α,ω-Amino Carboxylic Acids
Authors: Yamamoto Yoshinori , Furuta Toshiaki
Published: May 2006

The 5-, 6-, 7-, and 8-membered lactams are obtained from the corresponding α,ω-amino carboxylic acids in good to high yields by treatment with triethylgallium in toluene or benzene.
CO Hydrogenation on Supported Ultrafine Iron Particle Catalysts Prepared by Gas Evaporation Method
Authors: Chang Byong-tae , Kim Sung-jin , Hong Pang-bu
Published: May 2006

Ultrafine iron particles prepared by the gas evaporation method were found to be able to become high active and relatively stable catalysts for CO hydrogenation, simply by mixing them with supports, under the conditions of Fe contents less than 10 wt% and reaction temperatures below 250 °C. The sequence of catalytic activity, depending upon the kind of support, was as follows; TiO2(JRC-3,4,5 and Wake, M) > HZSM-5(US) > SiO2(M) > Al2O3(M) > NaZSM-5(M).
Aggregation States and Bistable Light Switching of (Liquid Crystalline Polymer)/(Low Molecular Weight Liquid Crystal) Mixture Systems
Authors: Kajiyama Tisato , Kikuchi Hirotsugu , Miyamoto Akira , Moritomi Satoru , Hwang Jenn Chiu
Published: May 2006

Binary mixtures composed of side chain type-liquid crystalline polymer (LCP) and low molecular weight liquid crystal (LMWLC) of which chemical structure is similar to the mesogenic side chain of LCP were prepared. Good miscibility between LCP and LMWLC was obtained in a mesophase state over a whole range of concentration. Response time of molecular reorientation by an imposed electric field remarkably decreased with an increase in the fraction of LMWLC. A new type of reversible and bistable electro-optical effect based on light scattering was proposed for the mixture system in a smectic state.
Reinvestigation of the Reaction of Samarium Metal with Mercury(II) Iodide
Authors: Deacon Glen B , Forsyth Craig M
Published: May 2006

Samarium(II) iodide is obtained from reaction of mercury(II) iodide with an excess of samarium metal in boiling tetrahydrofuran. The preparation involves formation and reduction of samarium(III) iodide and is affected by the quality of the samarium metal.
Evaluation of Defects of Polyimide Langmuir–Blodgett Films by Electrochemical Method
Authors: Nishikata Yasunari , Kakimoto Masa-aki , Morikawa Atsushi , Kobayashi Ichiro , Imai Yoshio , Hirata Yoshiki , Nishiyama Katsuhiko , Fujihira Masamichi
Published: May 2006

The defects of the polyimide LB films deposited on glassy carbon electrodes were examined by means of cyclic voltammetry of the redox couple of potassium ferri- and ferrocyanide in aqueous solution. The degree of defects of the polypyromellitimide LB films was apparently less than that of the cadmium arachidate LB film. The polyimide derived from aliphatic tetracarboxylic acid afforded the ten-layer LB films possessing no detectable defects.
Electrochemical Behavior of Polyimide Langmuir–Blodgett Films
Authors: Nishikata Yasunari , Kobayashi Ichiro , Kakimoto Masa-aki , Imai Yoshio , Hirata Yoshiki , Nishiyama Katsuhiko , Fujihira Masamichi
Published: May 2006

The redox reaction of the polyimide LB films themselves was examined by means of cyclic voltammetry. Both their cathodic and anodic current peaks decreased with potential cycling, and no peaks were observed after a few tens of sweeps, whereas the redox reaction was reversible in the case of polyimide cast films.
The Reaction of Cobalt(III) Porphyrins with α-Diazo-β-Dicarbonyl Compounds
Authors: Setsune Jun-ichiro , Iida Toshiya , Kitao Teijiro
Published: May 2006

Cobalt(III) porphyrins reacted with α-diazo-β-dicarbonyl compounds to give N,Co-methano bridged Co(III) porphyrins in good yields. The axial ligand and the peripheral substituents have great influence on the insertion of the carbenes and on the subsequent transformation to Co(III) N-alkylporphyrins with a linkage.
Intramolecular Asymmetric Lactonization Using Optically Active 1,2-Diphenylethylenediamine as a Chiral Auxiliary
Authors: Baba Naomichi , Sakamoto Akio , Mimura Mitsuo , Yamamoto Yukio , Uchida Katsuhiro , Oda Jun’ichi
Published: May 2006

Intramolecular asymmetric lactonizations of two cyclic hydroxydiamides bearing (R,R)-1,2-diphenylethylenediamine as a chiral auxiliary were performed by the use of trifluoroacetic acid as an acid catalyst. The reactions proceeded smoothly at r.t. affording the corresponding (S)-γ- and (S)-δ-lactonamides with 96 and 98 %e.e. respectively.
Isolation and Structure of Kuroyurinidine, a New Jerveratrum Alkaloid from Fritillaria camtschateensis
Authors: Sashida Yutaka , Mimaki Yoshihiro , Shimomura Hiroko
Published: May 2006

Kuroyurinidine, a novel jerveratrum alkaloid has been isolated from the MeOH extract of the fresh bulbs of Fritillaria camtschatcensis in addition to known phenolic glycosides. The structure and configuration has been shown by the extensive 2D NMR spectral analysis to be 2β, 3α, 6β-trihydroxy-5α-jervanin-12-ene.
Simple and Chemoselective Deprotection of Acetals Using Aqueous Dimethyl Sulfoxide
Authors: Kametani Tetsuji , Kondoh Hirotsune , Honda Toshio , Ishizone Hiroyuki , Suzuki Yukio , Mori Wakako
Published: May 2006

Deprotection of acetals was achieved in aqueous dimethyl sulfoxide under neutral reaction condition. Selective cleavage of acyclic acetals bearing various types of acid labile protecting groups was also reported.
Electrocatalytic Photolysis of Water at Photosystem II-Modified Carbon Paste Electrode Containing Dimethylbenzoquinone
Authors: Ikeda Tokuji , Senda Mitsugi , Shiraishi Takuo , Takahashi Masaaki , Asada Kozi
Published: May 2006

Photosystem II-enriched membranes from spinach chloroplasts were immobilized on the surface of a carbon paste electrode containing 2,6-dimethylbenzoquinone. The PS II membrane-modified electrode showed photocurrent response due to the photolysis of water, in which dimethylbenzoquinone served as an electron acceptor for the PS II reaction and as a mediator of electron transfer between the PS II membrane and the electrode.
Modifying Effect of Selenium on Catalytic Reactivity of Transition Metals
Authors: Yanada Kazuo , Yamaguchi Hiromi , Yanada Reiko , Meguri Haruo , Uchida Shuji
Published: May 2006

Sodium selenite increased the catalytic reactivity of the metal salts (MoCl5, FeCl2, SnCl2, HgCl2, CuCl2, PbCl2 and AsCl3) and decreased that of the metal salts (NaAuCl4, AgCl, BiCl3, CoCl2, NiCl2, PdCl2, and Na2PtCl6) in the reduction of nitrobenzene to N-phenylhydroxylamine and/or aniline with sodium borohydride in water.
The Structure of Brominated Diterpene from the Marine Red Alga Laurencia obtusa (Hudson) Lamouroux
Authors: Suzuki Teruaki , Takeda Satoshi , Hayama Naoki , Tanaka Isao , Komiyama Kanki
Published: May 2006

A new brominated diterpene, 15-bromo-2,7,16-trihydroxy-9(11)-parguerene has been isolated from the title alga and its structure including absolute configuration was established by spectral and chemical evidences as well as X-ray crystallographic method.
Synthesis of Solid Superacid of Molybdenum Oxide Supported on Zirconia and Its Catalytic Action
Authors: Hino Makoto , Arata Kazushi
Published: May 2006

A solid superacid catalyst was obtained by impregnating Zr(OH)4 with molybdic acid followed by calcining in air at 750–800 °C. XRD showed that superacid sites were not created by impregnation of the molybdate on the crystallized oxide, but on the hydroxide; the material then converted to the crystalline form by calcination.
Convenient Synthesis of Sulfur Ylides by Reaction of Active Methylene Compounds with Corey–Kim Reagent
Authors: Katayama Sadamu , Watanabe Toshio , Yamauchi Masashige
Published: May 2006

Reactions of active methylene compounds with Corey–Kim reagent in the presence of triethylamine afford stable sulfur ylides in satisfactory yields.
Stereochemical Aspects of Oxirane Ring Opening. Heterogeneous Catalytic Deuterolysis of cis and trans-1,2-Epoxy-4-t-butylcyclohexanes
Authors: Ishiyama Jun-ichi , Yashima Hiroaki , Matsuo Hironobu , Senda Yasuhisa , Imaizumi Shin , Hanaya Kaoru , Muramatsu Takashi
Published: May 2006

2H NMR analysis of deuterolyzed products from cis- and trans-1,2-epoxy-4-t-butylcyclohexane indicated that the cleavage of the oxirane C–O bond proceeds with inversion of configuration over noble metal catalysts except for Ru, while with retention over Co. Both retention and inversion competitively occurs over Ni and Ru.
Efficient Activation of Acetals toward Nucleophiles by the Use of Transition Metal Salts. New Method for Cyanation of Acetals and Orthoester Derived from Aromatic and α,β-Unsaturated Carbonyl Compounds with Trimethylsilyl Cyanide under Neutral Condition
Authors: Mukaiyama Teruaki , Soga Tsunehiko , Takenoshita Haruhiro
Published: May 2006

In the presence of a catalytic amount of transition metal salts (NiCl2, CoCl2, PdCl2, etc.), trimethylsilyl cyanide smoothly reacts with acetals or orthoester derived from aromatic and α,β-unsaturated carbonyl compounds to give the corresponding α-cyano derivatives under neutral condition.
Anion-Conducting Film Composed of Poly(vinyl chloride), Quarternary Ammonium Iodide, and Organotin Compound
Authors: Fujinami Tatsuo , Ishikawa Hitoshi , Takaoka Hiromitsu , Fukuzawa Shin-ichi , Sakai Shizuyoshi , Ogita Masami
Published: May 2006

Anionic conductivity of poly(vinyl chloride)-tetrabutylammonium iodide composite film has been remarkably increased by the addition of organotin compounds. At a high content of tributyltin iodide, the conductivity has been enhanced up to the order of 10−4 S/cm at 25 °C.
Bioactive Polyacetylenes from Stony Corals
Authors: Higa Tatsuo , Tanaka Junichi , Kohagura Toshikatsu , Wauke Tomoshige
Published: May 2006

Four new polyacetylenes have been isolated from three species of hermatypic corals, Montipora sp, M. mollis, and Pectinia lactuca. These compounds, representing the first such metabolites of coelenterates, exhibited ichthyotoxicity and inhibited the growth of some bacteria and fungi.
Stereoselective Addition of t-Butyldimethylsiloxy-1-ethoxyethene to 2-Trichloromethyl-1,3-dioxan-4-ones
Authors: Homma Koichi , Mukaiyama Teruaki
Published: May 2006

In the presence of a catalytic amount of trityl hexachloroantimonate, 2-trichloromethyl-1,3-dioxan-4-ones (1) , easily prepared from β-hydroxycarboxylic acids, are stereoselectively attacked by t-butyldimethylsiloxy-1-ethoxyethene to afford 1,3-dioxan-4-acetic acid derivatives. The stereoselectivity is dependent on both the substituent at the 5-position of 1 and the amount of the catalyst.
Preorganization of the Salicylideneaniline Ligand by Means of Bilayer Membrane
Authors: Ishikawa Yuichi , Nishimi Taisei , Kunitake Toyoki
Published: May 2006

Single-chain ammonium amphiphiles which contain the salicylideneaniline unit formed stable bilayer membranes in water. The component orientation is either parallel or tilted depending on the alkyl chain length, as inferred from X-ray diffraction patterns and absorption spectral shifts.
Molecular Recognition at the Interface. Synthesis and Monolayer Property of Long-Chain Derivatives of Kemp’s Acid
Authors: Ikeura Yasuhiro , Honda Yoshihiro , Kurihara Kazue , Kunitake Toyoki
Published: May 2006

Monolayer formation of octadecyl derivatives of a cyclohexanetricarboxylic acid (Kemp’s acid) was examined. A symmetrically substituted double-chain derivative gave a stable monolayer in which carboxylic acids formed cyclic dimers at the air-water interface.
Remarkably High Activity of Binuclear Iron(III) Complexes for Formation of TBA-active Compounds in Reaction with Linolenic Acid
Authors: Nishida Yuzo , Nasu Miyuki , Yamada Kasumi
Published: May 2006

We have observed that some binuclear iron(III) complexes with μ-phenoxo or μ-alkoxo bridge exhibit remarkably high activity for the formation of TBA-active compounds in the reaction with linolenic acid, whereas no activity was observed for the binuclear complexes of copper(II), nickel(II), cobalt(II), and manganese(III) with the same ligands.
Chlorodecarboxylation of 3-Methyl-3-(1,4-dimethyl-9-triptycyl)butanoic Acid Rotamers with Lead(IV) Acetate in the Presence of Lithium Chloride. Facile Hydrogen Transfer from the 1-Methyl Group in the sc-Isomer
Authors: Oki Michinori , Okamoto Toshiyuki , Toyota Shinji , Yonemoto Katsumi , Yamamoto Gaku
Published: May 2006

Oxidation of ap-3-methyl-3-(1,4-dimethyl-9-triptycyl)butanoic acid with lead(IV) acetate in the presence of lithium chloride afforded expected ap-9-(2-chloro-1,1-dimethylethyl)-1,4-dimethyltriptycene and 1,1,7,10-tetramethyl-1,2,6,10b-tetrahydro-6,10b-o-benzenoaceanthrylene, whereas the sc-isomer did 9-t-butyl-1-chloromethyl-4-methyltriptycene as a main product. The formation of the last compound is the implication of the facile hydrogen transfer from the 1-methyl group to the radical center formed in the 9-substituent of the triptycene.
Synthesis and Mössbauer Spectroscopic Studies of Oxo-Centered Mixed-Valence Trinuclear Iron Carboxylates with Long Chain Fatty Acid Anions
Authors: Nakamoto Tadahiro , Katada Motomi , Sano Hirotoshi
Published: May 2006

Oxo-Centered Mixed-valence trinuclear iron complexes with long chain fatty acid anions, such as myristate, palmitate, and stearate anions, were synthesized by the reaction of acetate complex, [Fe3O(CH3CO2)6(py)3] with long chain fatty acid in pyridine. XRD patterns of them show that they have a layer structure. Their Mössbauer spectra show a delocalized valence state at room temperature while a localized valence state at lower temperatures.
Asymmetric Transformation of N-Methyl-(RS)-2-phenylglycine
Authors: Shiraiwa Tadashi , Sakata Shinji , Baba Yoshihisa , Kurokawa Hidemoto
Published: May 2006

The asymmetric transformation of N-methyl-(RS)-2-phenylglycine ((RS)-Mpg) via formation of the salt with (S)-camphor-10-sulfonic acid was achieved in butanoic acid without using a catalyst such as aldehydes or ketones. The salt purified by recrystallization was treated with triethylamine to give (R)-Mpg with approximately 100% optical purity in 71–77% yield.
Acyl Nitronates in Organic Synthesis. An Expeditious Synthesis of 2,5-Dialkylpyrrolidines and 2,5-Dialkylpyrrolines Including Ant Venom Alkaloids
Authors: Miyashita Masaaki , Awen Bahlul Z E , Yoshikoshi Akira
Published: May 2006

Acetyl nitronates (acetic nitronic anhydrides), readily obtainable from ketones and nitroalkenes, have been demonstrated to serve as potentially useful intermediates for the synthesis of 2,5-dialkylpyrrolidines and 2,5-dialkylpyrrolines, and a short-step synthesis of some ant venom alkaloids has been accomplished via these acetyl nitronates.
Direct Observation of Helices and Vesicles of Ammonium Bilayers by High-Resolution, Scanning Electron Microscopy
Authors: Ishikawa Yuichi , Nishimi Taisei , Kunitake Toyoki
Published: May 2006

The steric structures of helices and vesicles formed from bilayer membranes of ammonium amphiphiles were observed without metal coating by high-resolution scanning electron microscopy. These observations agreed with those made by transmission electron microscopy.
Removal of Thallium from Waste Water by Using the Iron Metal and Hydrogen Peroxide
Authors: Kikuchi Eiji , Itoh Kiminori , Fujishima Akira , Yonezawa Takashi , Kimura Toshimune
Published: May 2006

Thallium in waste water can be removed effectively by DOWA Iron Powder Method which uses Fe metal powder and H2O2. The concentration of Tl in waste water was decreased by a factor of about 100 from the initial concentration with each treatment.
Steric Compression-assisted Reaction in Tropolones. Possible Generation of a Novel Resonance Hybrid in 3,7-Disubstituted Tropolones
Authors: Tezuka Takahiro , Kasuga Hiroto , Isahaya Yoshinori , Nozoe Tetsuo
Published: May 2006

The steric compression-assisted proton dissociation in 3,7-disubstituted tropolones generates a new resonance hybrid of the tropolone, which contains the tropylium ion moiety and proton. This resonance hybrid model explains the observed unusual chemical properties of 3,7-disubstituted tropolones.
Steric Effect of Alkylidene Groups of Furylfulgides on the Photochromic Behavior
Authors: Yokoyama Yasushi , Iwai Takeshi , Kera Naohiko , Hitomi Isamu , Kurita Yukio
Published: May 2006

Photoreactions of furylfulgides having a large alkylidene group (7-norbornylidene or 2-adamantylidene) were investigated. An adamantylidene fulgide with [1-(2,5-dimethyl-3-furyl)-2-methyl]propylidene group recorded 0.51 and 0.26 for coloring and bleaching quantum yields, respectively.
Exchange Reaction between Methyl Hydrogens of Methanol over Solid-Base Catalysts
Authors: Ueda Wataru , Kuwabara Tetsuo , Kurokawa Hideki , Morikawa Yutaka
Published: May 2006

An isotope exchange reaction of hydrogen in methyl group of methanol was found to occur over solid-base catalysts. A mixture of CD3OD and CH3OD (1:1), when passed over MgO at 330 °C, changed to a nearly isotopically equilibrated mixture of deuterated methanols.
Effects of Reduction Temperatures on Electron Spin Resonance Spectra of CaS:Eu
Authors: Matsui Hiroshi , Hashizume Genzo , Adachi Gin-ya
Published: May 2006

Polycrystalline CaS:Eu2+ phosphors have been prepared by the reduction of CaSO3:Eu:·1/2H2O in a stream of H2S gas at 450, 600, and 900 °C for 3 to 24 h. All samples have been examined by means of ESR and photoluminescence spectroscopy. The emission intensity due to Eu2+ increased with the increase of reduction temperatures. The interstitial Eu2+ ions were observed for the CaS host prepared even at as low as 450 °C. At a higher reduction temperature, the Eu2+ ion may enter a Ca cite in the CaS host lattice substitutionally.
Shape Selective Epoxidation of Alkenes Catalyzed by Titanosilicate
Authors: Tatsumi Takashi , Nakamura Makoto , Yuasa Kensei , Tominaga Hiro-o
Published: May 2006

Epoxidation of 1- and 2-hexenes with H2O2 was catalyzed by titanosilicate whereas cyclohexene failed to be oxidized by this catalyst system. This shape selectivity was ascribed to the molecular sieving action of titanosilicate. The rates for epoxidation of linear alkenes decreased with increasing the chain length.
The Reduction of Nitrile with 2-Propanol over Hydrous Zirconium Oxide
Authors: Takahashi Kyoko , Shibagaki Makoto , Matsushita Hajime
Published: May 2006

The vapor-phase reduction of nitriles with 2-propanol proceeded efficiently over hydrous zirconium oxide to give the corresponding alcohols in high yields.
Optical Resolution of Alcohols and Amines on Poly[(S)-(−)-p-(p-tolylsulfinyl)styrene] by Means of HPLC
Authors: Kunieda Norio , Chakihara Hiroaki , Kinoshita Masayoshi
Published: May 2006

Poly[(S)-(−)-p-(p-tolylsulfinyl)styrene], which exert high donor ability, can be counted among the efficient stationary phase of the optical resolution of chiral aromatic alcohols and amines by means of HPLC.
Crystal Structure and Properties of [NMe4]2[Cu(C3Se5)2]·2MeCN
Authors: Matsubayashi Gen-etsu , Yokozawa Akito
Published: May 2006

An X-ray crystal structure analysis of the title complex has revealed that the CuSe4 geometry around the copper(II) ion is greatly distorted from a square-planar one, with a dihedral angle of 53.7° between the two diselenolato ligand planes and that the anion moieties are arranged with some Se–Se contacts to form a two-dimensional molecular sheet. The complex behaves as a semiconductor.
Adduct between (η-Cyclopentadienyl)(1,2-diphenyl-1,2-ethylenedithiolato)rhodium(III) and Quadricyclane
Authors: Kajitani Masatsugu , Eguchi Yutaka , Abe Ryuko , Akiyama Takeo , Sugimori Akira
Published: May 2006

(η-Cyclopentadienyl)(1,2-diphenyl-1,2-ethylenedithiolato)rhodium(III) complex (1) reacts with quadricyclane (Q) to give a 1:1 adduct in which Rh and S of the complex are bridged by 5-norbornene-2,3-diyl group. The adduct dissociates to give 1 and norbornadiene upon irradiation with a medium pressure mercury lamp.
threo-Selective Michael Addition of N,N-Dibenzylglycinate and Alaninate Enolates to α,β-Unsaturated Esters. A Concise and Stereoselective Synthesis of (±)-CCG-II
Authors: Yamaguchi Masahiko , Torisu Kazuhiko , Minami Toru
Published: May 2006

Lithium enolates of N,N-dibenzylglycinate and alaninate added to β-substituted α,β-unsaturated esters, and threo-adducts were obtained in high stereoselectivities. The reaction was employed in a concise and Stereoselective synthesis of (±)-CCG-II.
The Carboxylation of Active Methylene Compounds with Diphenylcarbodiimide and Potassium Carbonate
Authors: Chiba Koji , Tagaya Hideyuki , Karasu Masa , Ono Tsuyoyuki , Kugiya Masashi
Published: May 2006

Active methylene compounds were carboxylated by employing the reagent system, diphenylcarbodiimide and potassium carbonate, in dimethyl sulfoxide at room temperature and atmospheric pressure. The reaction proceeded even in the absence of carbon dioxide, but the carboxylation easily proceeded in carbon dioxide atmosphere.
Characterization of Highly Selective Cu–Ni Amination Catalysts
Authors: Abe Hiroshi , Hoshi Satoko , Domen Kazunari , Maruya Ken-ichi , Ohtaki Hitoshi , Onishi Takaharu
Published: May 2006

The characterization of Cu–Ni amination catalysts has been done by using TEM, XPS, and EXAFS. The Cu–Ni catalyst whose nickel atoms were hard to be reduced even at high temperatures under a hydrogen atmosphere gave high selectivity in the reaction between dodecyl alcohol and dimethylamine to produce N,N-dimethyldodecylamine.
New Series of Liquid Crystalline Polyacrylates with Wide Mesomorphic Temperature Range
Authors: Sakagami Sakumitsu , Nakada Masao
Published: May 2006

New liquid crystalline polyacrylates having ester linkages were synthesized. The methoxy and ethoxy derivatives among these polyacrylates exhibit a thermally stable nematic phase with a wide temperature range useful for gas-liquid chromatography.
Covalent Bonding of Two Ag(I) Atoms to a Square-Planar Pt(II) Atom in [Pt3(S2CNEt2)6Ag2](ClO4)2
Authors: Ebihara Masahiro , Sakurai Kenji , Kawamura Takashi , Katayama Hiroaki , Masuda Hideki , Taga Tooru
Published: May 2006

[Pt(S2CNEt2)2] reacts with [AgClO4] to form [{Pt3(S2CNEt2)6Ag2}(ClO4)2]. Its crystal has an extended two-dimensional cationic lattice with an Ag-Pt-Ag arrangement [Pt-Ag = 2.932(2) Å and ∠Ag–Pt–Ag = 166.8(1)°] unsupported by covalently bridging ligands.
Intramolecular Photo- and Thermal Dimerizations of Diaza[3.3](9,10)anthracenophanes
Authors: Usui Masao , Shindo Yoshio , Nishiwaki Tohru , Anda Kinji , Hida Mitsuhiko
Published: May 2006

Intramolecular dimerizations of seven novel diazaanthracenophanes (1) were studied. Some of 1 underwent the novel thermal dimerization of anthracene rings. The reactivities of 1, were classified into three types according to the direction in the thermal reaction.
Total Synthesis of Methoxyhygromycin and Its 5-Epimer
Authors: Chida Noritaka , Nakazawa Keiichi , Ohtsuka Masami , Suzuki Minoru , Ogawa Seiichiro
Published: May 2006

Methoxyhygromycin, an antibiotic having a unique structure among the aminocyclitol antibiotics, and its 5-epimer are first synthesized. This synthesis fully confirmed the proposed structure of the antibiotic and revealed that neo-configuration of cyclitol moiety is important for the appearance of antibacterial activity.
Facile Cleavage of Adenosine 2′,3′-Cyclic Phosphate at pD 7 Catalyzed by Co(III)-Triethylenetetramine Complex
Authors: Matsumoto Yoichi , Komiyama Makoto , Takeuchi Kazuhiko
Published: May 2006

Adenosine 2′,3′-cyclic phosphate is efficiently cleaved to adenosine by the [Co(triethylenetetramine)(OH)(H2O)]2+ complex at pD 7.0, 20 °C. The cleavage (the rate constant 1.9 × 10−2 min−1) in the presence of the complex (0.05 mol dm−3) is nearly 106 fold faster than the hydrolysis in the absence of the complex.
Uphill Transport of Carbohydrates across Ion-Exchange Membranes
Authors: Shigemasa Yoshihiro , Okamoto Shin-ichi , Sashiwa Hitoshi , Saimoto Hiroyuki
Published: May 2006

Without any transformation into ionized derivatives, carbohydrates themselves were transported across ion-exchange membranes against their concentration gradients. Amounts of moved sugars were affected by their pKa values.
A Mössbauer Study on Behaviors of Tin Deposited on the α-Fe2O3 Surface
Authors: Ichiba Sumio , Oshita Hiroyuki , Sakai Hiroshi
Published: May 2006

The doping process of metallic tin into the α-Fe2O3 crystal lattice was studied by using 119Sn Mössbauer spectroscopy. The spectra of the heat-treated samples at 300 °C for 10 h show the existence of Sn2O3, remaining β-Sn, and α2-Sn. The α2-Sn species is characteristic with the unusually large value of the isomer shift (I.S. = 4.5 ± 0.2 mm s−1).
A New Method of the Zinc Promoted Transformation of Carbonyl Compounds to Homoallylic Alcohols
Authors: Shono Tatsuya , Ishifune Manabu , Kashimura Shigenori
Published: May 2006

A Zn-promoted transformation of a variety of carbonyl compounds to homoallylic alcohols has been accomplished in excellent yields by using DMF as the solvent.
Diastereoselective Addition of Organometallics to 3,4-O-Isopropylidene-L-glycero-2-tetrulose Derivatives
Authors: Nagano Hajime , Ohno Mina , Miyamae Yoko
Published: May 2006

Diastereoselectivity in the addition of Grignard reagents (RMgX) to 1-O-benzoyl-3,4-O-isopropylidene-L-glycero-2-tetrulose and 3,4-O-isopropylidene-1-O-triphenylmethyl-L-glycero-2-tetrulose (2) depended remarkably on X, R, and the reaction temperature. The addition of EtMgBr, i-PrMgBr, and BuMgCl to 2 at 0 °C gave (2R,3S)-adducts with high diastereoselectivity (≥ 94% de).
Iodine Atom-Transfer Ring-Opening of 1,1-Difluoro-2-(1-iodoalkyl)cyclopropanes by Free-Radical Reaction
Authors: Morikawa Tsutomu , Uejima Masayuki , Yoda Kazuaki , Taguchi Takeo
Published: May 2006

Free-radical chain reaction of 1,1-difluoro-2-(1-iodoalkyl)cyclopropanes with hexabutylditin and irradiation gave (E)-difluorohomoallyl iodides via iodine atom-transfer ring-opening.
Cell Specificity of Polysaccharide Derivatives on Liposomal Surface
Authors: Akiyoshi Kazunari , Takanabe Hidenobu , Sato Tetsuya , Sato Toshinori , Kondo Hiroki , Sunamoto Junzo
Published: May 2006

Various pullulan derivatives, which have both cholesterol and another monosaccharide terminal such as hexosamines and 1-aminohexoses, were synthesized and employed for coating liposome. The lectin-induced aggregation and the phagocyte uptakes of such polysaccharide-coated liposomes were effectively controlled by changing only the terminal sugar residue of polysaccharide derivatives.
The Partial Oxidations of Benzene and Cyclohexane During Fuel Cell Reactions of O2 and H2
Authors: Otsuka Kiyoshi , Yamanaka Ichiro
Published: May 2006

The partial oxidations of benzene and cyclohexane have been carried out in the cathode during O2–H2 fuel cell reaction at 298 K. The Pd-black electrode embedded in graphite catalyzes the formation of phenol from benzene and those of cyclohexanol and cyclohexanone from cyclohexane. It is suggested that the hydrogen peroxide generated at the cathode through the O2–H2 fuel cell reaction reacts with benzene and cyclohexane producing their oxygenates.
A Novel Thin Film of Anion Exchanger Prepared by Plasma Polymerization
Authors: Ogumi Zempachi , Uchimoto Yoshiharu , Tsujikawa Masanori , Takehara Zen-ichiro
Published: May 2006

A novel ultra-thin film of an anion exchanger has been prepared by plasma-polymerization of 4-vinylpyridine followed by quaternarization. The resulting anion exchange film exhibits a chloride ion transference number of higher than 0.8 in the aqueous KCl system.
Hydrolysis of Adenosine 2′,3′-Cyclic Phosphate and Adenylyl(3′-5′)adenosine Catalyzed By Alkylenediamines
Authors: Yoshinari Koichi , Komiyama Makoto
Published: May 2006

Alkylenediamines exhibit remarkable catalysis for the hydrolysis of adenosine 2′,3′-cyclic phosphate and adenylyl(3′-5′)adenosine. The significant catalysis is ascribed to the intramolecular cooperation between the neutral amine and the protonated amine in the alkylenediamines.
Ferroelectric Liquid Crystalline Compounds Having a Chiral Center Directly Connected to the Core Aromatic Ring. Synthesis of Chiral 4-(1-Propoxyethyl)benzenol and-benzoic Acid, 4-(1-Carboxyethyl)benzenol and the Esters Derived Therefrom
Authors: Kusumoto Tetsuo , Ueda Tomoko , Hiyama Tamejiro , Takehara Sadao , Shoji Tadao , Osawa Masashi , Kuriyama Takeshi , Nakamura Kayoko , Fujisawa Toru
Published: May 2006

The title compounds were prepared through asymmetric reductions and derivatized into the ester compounds which were shown to be potent chiral dopants for ferroelectric liquid crystal materials.
Kinetic Resolution of Racemic β-Hydroxy Amines by Enantioselective N-Oxide Formation
Authors: Hayashi Masahiko , Okamura Fumie , Toba Taketo , Oguni Nobuki , Sharpless K Barry
Published: May 2006

Kinetic resolution of racemic β-hydroxy amines with a t-butyl substituent was attained in high optical yield by asymmetric oxidation.
Novel Generation of o-Quinone Methides on the Basis of Lewis Acid Catalyzed 1,4-Dethiolation of o-(1-(Alkylthio)alkyl)phenols
Authors: Inoue Tsutomu , Inoue Seiichi , Sato Kikumasa
Published: May 2006

The treatment of o-(1-(alkylthio)alkyl)phenols with Lewis acid resulted in the formation of o-quinone methides by the novel 1,4-dethiolation process, which, being activated with Lewis acid, reacted in situ with various dienophiles in the manner of Diels–Alder reaction in high efficiency. o-Quinone allide, provided from o-(1-(alkylthio)allyl)phenol, also behaved as heterodienes.
Reaction of Carbon Dioxide with (Poiphyrinato)aluminum Thiolates
Authors: Arai Toru , Sato Yoshihiro , Inoue Shohei
Published: May 2006

Reaction of (tetraphenylporphyrinato)aluminum thiolate ((TPP)AlSR) with CO2 under atmospheric pressure at room temperature afforded (TPP)Al alkylthiocarbonate when R is alkyl or benzyl. Aluminum thiolate complex of capped porphyrin failed to undergo the same reaction, suggesting the importance of the sixth coordination site of the aluminum metal.
TeCl4-Mediated Reaction of β-Keto Nitroalkanes with Activated Olefins. Formation of 3-Acyl-2-isoxazolines
Authors: Suzuki Hitomi , Shimizu Hiroshi , Inamasu Tokuo , Tani Hiroyuki , Tamura Rui
Published: May 2006

Treatment of β-keto nitroalkanes with tellurium tetrachloride followed by triethylamine in the presence of activated olefins leads to 3-acyl-2-isoxazolines in good to modest yields.
General and Facile Synthesis of 2-Substituted Tropothiones
Authors: Machiguchi Takahisa , Kano Yuichi , Hasegawa Toshio
Published: May 2006

Several tropothiones having an electron-donating group at the C-2 position have been synthesized by direct thiocarbonylation of the corresponding tropones in polar solvents. The products are characterized by IR, UV-visible, and 1H NMR spectroscopies.
Inert Solvent for Catalytic C–H Activation. Achievement of High Conversion in Dehydrogenation of Alkane
Authors: Sakakura Toshiyasu , Ishida Katsuaki , Tanaka Masato
Published: May 2006

High conversions are achieved in photo-assisted dehydrogenation of alkane catalyzed by RhCl(CO)(PMe3)2 using bulky hydrocarbons like 2,2,5,5-tetramethylhexane and 1,3,5-tri-t-butylbenzene as inert solvents. Main by-product in cyclooctane dehydrogenation at a high conversion is 1,3-cyclooctadiene.
HPLC Separation of Enantiomers on a Chiral Stationary Phase Containing 1,1′-Bianthracene-2,2′-dicarboxylic Acid Bonded to Silica Gel
Authors: Ôi Shuichi , Shijo Masayuki , Miyano Sotaro
Published: May 2006

A chiral stationaly phase (CSP) comprised of axially chiral 1,1′-bianthracene-2,2′-dicarboxylic acid chemically bonded to aminopropylsilanized silica gel was prepared for HPLC separation of enantiomers. This phase showed far better discrimination for a wide range of aromatic and aliphatic alcohols and diols as 3,5-dinitrophenylcarbamates than that which was prepared from 1,1′-binaphthalene-2,2′-dicarboxylic acid.
Diastereoselective S ynthesis of 2,5-Substituted Tetrahydrofurans by Intramolecular Alkylation of an Ester Enolate
Authors: Fujisawa Tamotsu , Okumura Yoshiyuki , Sato Toshio
Published: May 2006

Highly diastereoselective cyclization is carried out by the intramolecular alkylation of an ester enolate of t-butyl α-alkoxyacetates. The addition of lithium salt enhances the diastereoselectivity of the reaction to afford 2,2,5-trisubstituted tetrahydrofurans.
Chelate Size Dependence of Dihydrogen-Hydride Exchange in Ruthenium(II) Molecular Hydrogen Complexes with Diphosphines [RuH(η2-H2)(P-P)2]PF6 (P-P = Ph2P(CH2)nPPh2; n = 2,3,4)
Authors: Saburi Masahiko , Aoyagi Ko , Takahashi Tamotsu , Uchida Yasuzo
Published: May 2006

The introduction of H2 gas into CD2Cl2 solutions of the five-coordinate complexes [RuH(P-P)2]PF6 (1) resulted in the spontaneous generation of molecular hydrogen complexes [RuH(η2-H2)(P-P)2]PF6 (2) (P-P = 1,3-bis(diphenylphosphino)propane, 1,4-bis(diphenylphosphino)butane). 1H-NMR measurements revealed that the dihydrogen-hydride exchange for a series of complexes 2 depends significantly on the size of diphosphine chelate.
Effect of Sample Weight on Micro DSC Measurements of Heptacosane
Authors: Takamizawa Kanichiro , Urabe Yoshiko
Published: May 2006

Micro DSC measurement of solution-crystallized heptacosane was confirmed to be reliable down to a sample weight of 0.01 mg order. However, a close contact between the sample of such a slight amount and the sample pan resulted in a decrease in the transition enthalpy. This effect was interpreted from an entropic standpoint.
Allylation of α-Diketones by Photochemical Reactions with Allylic Stannanes. Regiochemistry of Introduced Allylic Group
Authors: Takuwa Akio , Nishigaichi Yutaka , Yamashita Koichi , Iwamoto Hidetoshi
Published: May 2006

Irradiation of an acetonitrile solution of benzils and acenaphthenequinone in the presence of allylic stannanes afforded homoallylic alcohols in good yields. In the reaction with unsymmetric allylstannanes, the allylic groups were introduced predominantly at α-positions. The completely regioselective introduction could be achieved by the irradiation in the presence of NaOH or CoCl2 as an additive.
Sulfurization Reaction of 1,3-Diphosphaallene. X-Ray Structure of cis-2,4-Bis(2,4,6-tri-t-butylphenyl)-1,2,4-thiadiphosphetane 2,4-Disulfide
Authors: Toyota Kozo , Yoshifuji Masaaki , Hirotsu Ken
Published: May 2006

1,3-Bis(2,4,6-tri-t-butylphenyl)-1,3-diphosphaallene was reacted with elemental sulfur to give cis-2,4-bis(2,4,6-tri-t-butylphenyl)-1,2,4-thiadiphosphetane 2,4-disulfide and the structure was determined by X-ray crystallography.
Microbial Transformation of 2-Butyn-1,4-diol into 4-Hydroxy-2-butynoic Acid by Specific Oxidation of the Hydroxymethyl Group
Authors: Matsumura Shuichi , Yoda Nobuo , Endo Masato , Yoshikawa Sadao
Published: May 2006

2-Butyn-1,4-diol was oxidized quantitatively by the liophilized cell of Rhinocladiella atrovirens KY801 to afford the monocarboxylated product, 4-hydroxy-2-butynoic acid. Neither aldehydes nor degrading compounds were detected in the reaction mixture.
Enzymatic Oxidative Conversion of Thio to Oxo by Baker’s Yeast in Thiocarbamates and Thioureas
Authors: Kamal Ahmed , Rao Maddamsetty V , Rao Adari B
Published: May 2006

The enzymatic conversion of aryl allylthiocarbamates and 1-allyl-3-arylthioureas by baker’s yeast to the corresponding carbamates and ureas in good yields is described.
Electroluminescence in a Terbium Complex
Authors: Kido Junji , Nagai Katsutoshi , Ohashi Yutaka
Published: May 2006

Electroluminescent devises consisted of two layers, a hole injecting diamine layer and an emitting Tb3+ complex of acetylacetonate layer, were fabricated by vacuum deposition. The EL cells exhibited characteristic bright Tb3+ luminescence with high efficiency at low drive voltage.
17O NMR Evidence for Magnetic Anisotropy Due to Metal Cluster Cores
Authors: Onaka Satoru , Takagi Shigeru , Furuta Hiroyuki
Published: May 2006

17O NMR spectra have been measured for series of metal carbonyl derivatives and convincing evidence for magnetic anisotropy due to the metal cluster core has been obtained from the comparison of the 17O chemical shift data for RCCo3(CO)7dppfe, RCCo3(CO)7dppm, MeCpMn(CO)xdppfe, and MeCpMn(CO)xdppm.
New Ring Opening Oxidation of Methyl Sterculate and Malvalate
Authors: Nakatani Munehiro , Matsuoka Yuki , Uchio Yasuto , Hase Tsunao
Published: May 2006

Air oxidation of cyclopropane fatty acid methyl esters, methyl sterculate and malvalate, resulted in the cleavage of cyclopropene ring, respectively, to afford a pair of conjugated enones containing a terminal methylene group.
Crystal Structure of Photosensitive Uranyl Ethoxycarboxylate Complexes
Authors: Yokoyama Yu , Inaba Akira , Hara Hiroshi , Yamazaki Tomio , Tamura Hatsue , Kushi Yoshihiko
Published: May 2006

Two photosensitive uranyl complexes have been prepared and examined by a single-crystal X-ray diffraction study. Both compounds crystallize in the monoclinic system. In bis(β-ethoxypropionato)dioxouranium(VI), uranyl ions are equatorially coordinated by six carboxylate oxygen atoms, forming one-dimensional infinite chains. In bis(ethoxyacetato)dioxouranium(VI), uranyl ions are equatorially coordinated by four carboxylate and one ethoxy oxygen atoms, forming two-dimensional network of uranyl-ligand infinite chains.
Permeation Characteristics of a Glycolipid Monolayer-Deposited Agar Hydrogel
Authors: Higashi Nobuyuki , Takematsu Minoru , Niwa Masazo
Published: May 2006

The monolayer film of glycolipid, 2C18-de-MA, containing α-D-glucopyranosyl-D-gluconamide as a hydrophilic head group and two long alkyl chains was successfully formed on an agar hydrogel by Langmuir-Blodgett technique. The permeability of the modified hydrogel membrane thus obtained depended strongly upon the hydrophobicity of permeants and could be controlled by the phase transition of the deposited monolayer.
Detection of the Triplet State of Some Organic Molecules Adsorbed on Cellulose Substrate by Diffuse Reflectance Laser Photolysis Method
Authors: Ikeda Noriaki , Hara Takeshi , Masuhara Hiroshi
Published: May 2006

Absorption spectra and decay processes of the triplet states of sodium 1-pyrenylsulfonate, phenanthrene, and p-terphenyl adsorbed on cellulose filter paper have been measured directly by a nanosecond diffuse reflectance laser photolysis method.