bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oxygenation of Porphinatoiron(II) Complexes with Imidazole-Containing Glycerophosphocholines in Phospholipid Bilayers
Authors: Tsuchida Eishun , Hasegawa Etsuo , Chika Yuzuru , Babe Takeshi , Nishide Hiroyuki 
Published: May 2006

Abstract
Diacylgylecero-3-phosphocholine derivatives having an imidazole ligand at the terminal of an acyl-chain on the 2nd position of glycerol backbone were synthesized. The amphiphilic lignds formed lipid bilayers with phospholipids and the heme complexes gave oxygen complexes in water (pH 7.4) at 25 °C.
Interaction Mode Between Poly(acrylic acid) and Fe3+ Ions. Gelation Mechanism of the System
Authors: Yokoi Hiroshi , Nishi Hirotaka 
Published: May 2006

Abstract
The successful preparation of homogeneous gels from aqueous poly(acrylic acid) and Fe3+ systems is described first. It has been revealed by optical absorption, ESR, and magnetic susceptibility measurements that Fe3+ ions in the gels exist as clusters analogous to polynuclear basic iron(III) carboxylates.
Chiral Synthesis of Novel α-Yohimbane Alkaloids (−)-Nitraraine and (−)-Dihydronitraraine
Authors: Takano Seiichi , Samizu Kiyohiro , Sugihara Takumichi , Satoh Shigeki , Ogasawara Kunio 
Published: May 2006

Abstract
Chiral synthesis of α-yohimbane alkaloids (−)-nitraraine and (−)-dihydronitraraine has been achieved employing the Claisen–Cope rearrangement as the key step. Comparison of the physical and spectral data, however, did not establish identity between the synthetic and natural substances, respectively.
Cooperation of Alkali Metal Ions and β-Cyclodextrin for the Regioselective Cleavage of Adenosine 2′,3′-Cyclic Phosphate
Authors: Komiyama Makoto , Takeshige Yuichi , Sawada Shinya 
Published: May 2006

Abstract
Sodium(I), potassium(I), rubidium(I), and cesium(I) ions significantly increase both the selectivity and the rate constant for the β-cyclodextrin-induced regioselective cleavage of adenosine 2′,3′-cyclic phosphate. The ratio of the 2′-phosphate to the 3′-phosphate in the product is 11.2 with sodium chloride and β-cyclodextrin (3.0 and 0.015 mol dm−3) at pH 11, 30 °C.
Preparation of Silicon Oxide Overlayer Deposited on Alumina by Utilizing Surface Silanization with CH3Si(OCH3)3 and Its Pronounced Catalytic Activities for Isomerizations of 1-Butene and Cyclopropane
Authors: Imizu Yuzo , Tada Akio 
Published: May 2006

Abstract
Silicon oxide overlayer on alumina was prepared by utilizing the silanization of alumina surface with CH3Si(OCH3)3. With raising a coverage of the overlayer, its catalytic activities for 1-butene and cyclopropane isomerizations remarkably increased, resulting in a more active catalyst than a commercial silica-alumina catalyst.
Synthesis of Oligoribonucleotides by the Hydroxybenzotriazole-Activated Phosphotriester/Dicyclohexylcarbodiimide System
Authors: Hirao Ichiro , Miura Kin-ichiro 
Published: May 2006

Abstract
Addition of dicyclohexylcarbodiimide stabilized the benzotriazole-activated phosphotriester intermediates in which were used oligoribonucleotide synthesis. By this system, two oligoribonucleotides, r(CGAAAGC) and r(GCGAAAGC), were synthesized for structural comparison with d(GCGAAAGC) whose structure was unusually stable. Electrophoretic experiments showed r(GCGAAAGC) to behave differently from d(GCGAAAGC), although each had the same base sequence.
Cyclocondensation of 2-Methylresorcinol with Formaldehyde. A Synthesis of Conformationally Mobile Metacyclophanes
Authors: Konishi Hisatoshi , Iwasaki Yorio , Okano Tamon , Kiji Jitsuo 
Published: May 2006

Abstract
The acid-catalyzed condensation of 2-methylresorcinol with formaldehyde gave a complex mixture, from which a cyclic tetramer(1) was isolated as a hexamethylphosphoric triamide adduct.
Crystal Structure and 13C NMR of α-Pyrrolidonato-bridged [Pt(III)2(NH3)4(C4H6NO)2(NO2)(NO3)](NO3)2·H2O and Conversion of the Binuclear into Tetranuclear Complex on Electrochemical Redox Reaction
Authors: Abe Takeya , Moriyama Hiroshi , Matsumoto Kazuko 
Published: May 2006

Abstract
α-Pyrrolidonato-bridged binuclear Pt(III) complex [Pt2(NH3)4(C4H6NO)2(NO2)(NO3)](NO3)2·H2O has been synthesized and the crystal structure, 13C NMR, and cyclic voltammetry are reported. It has been revealed that both binuclear Pt(III) complex and tetranuclear Pt(III) complex are produced from the oxidation of [Pt4(NH3)8(C4H6NO)4]6+ depending on the oxidizing agent used.
Spin Distribution in the Phenyldiazenyl Radical
Authors: Suehiro Tadashi , Sato Toshiaki , Sano Tetsuya , Koike Akemi , Rieker Anton 
Published: May 2006

Abstract
Hyperfine coupling constants of carbons in the benzene ring of phenyldiazenyl radical were determined. The high hfs constant of C-1, 62.2 G, is a characteristic nature of phenyldiazenyl.
Absolute Configuration of Optically Active Tricyclo[2.2.1.02,6]heptan-3-ol (Nortricyclanol). An Enhancement of Enantiomeric Purity of a Chiral Alcohol by Repeating Enzymatic Kinetic Resolution
Authors: Hirose Yoshiki , Anzai Mika , Saitoh Minoru , Naemura Koichiro , Chikamatsu Hiroaki 
Published: May 2006

Abstract
Tricyclo[2.2.1 .02,6]hept-3-yl acetate (1b) was resolved by repeated enantioselective hydrolysis catalyzed by Candida cylindracea lipase, to give (+)-1b and (−)-nortricyclanol (1a) in high enantiomeric excess. By the chemical correlation with the known exo-2-norbornanol, the absolute configuration of (−)-1a was assigned to be (1R,3S,6S).
Various Coordination Modes of 1,1′-Bis(diphenylphosphino)ferrocene, dppfe, with Metals. Syntheses and X-Ray Structural Characterization of Metal Carbonyl Complexes of dppfe, MeCCo3(CO)7dppfe and [ClMn(CO)4]2dppfe
Authors: Onaka Satoru , Mizuno Atushi , Takagi Shigeru 
Published: May 2006

Abstract
Thermal reaction of MeCCo3(CO)9 with dppfe has afforded MeCCo3(CO)7dppfe (2), where three terminal carbonyls shift to bridging positions and dppfe functions as a bridging ligand. Photochemical reaction of Mn2(CO)10 with dppfe followed by further photolysis with CCl4 has yielded [ClMn(CO)4]2dppfe (3). Two new types of coordination mode of dppfe as a bidentate ligand have been demonstrated by X-ray molecular analyses of 2 and 3 instead of a chelational type of coordination.
A Multi-layered Film of a Two-Dimensionally Crosslinked Acrylate Polymer
Authors: Asakuma Sumitoshi , Kunitake Toyoki 
Published: May 2006

Abstract
A multilayered film of a two-dimensionally cross-linked polymer of oligoethylene glycol bis-acrylate was prepared by using a cast film of an ammonium bilayer membrane as molecular template.
Highly Selective Solvent Extraction of Copper(II) from Transition Metal Ions with Dibutyl N,N′-Bis(8-quinolyl)malonamide
Authors: Hiratani Kazuhisa , Taguchi Kazuhiro , Ohhashi Kozaburo , Nakayama Hiroshi 
Published: May 2006

Abstract
Dibutyl-N,N′-bis(8-quinolyl)malonamide can extract only Cu(II) with excellent selectivity among Cu(II), Ni(II), Co(II), and Zn(II) both in the competitive and single metal ion-extraction. It forms 1 : 1 complex with Cu(II) ion accompanied with the release of two protons from the amide groups.
Palladium(0)-Catalyzed Amination of Allylic Acetate with Methyl Carbamate
Authors: Takagi Masatoshi , Yamamoto Keiji 
Published: May 2006

Abstract
Methyl sodiocarbamate, a recalcitrant nucleophile toward π-allylpalladium intermediate, was found to react with allylic acetates to give allylic carbamates in the presence of a catalytic amount of Pd(PPh3)4 in THF-DMSO mixed solvent.
Photoinduced Hydride Reduction of an NAD+ Analogue with Permethylpolysilanes Acting as Electron Sources and Water as a Proton Source
Authors: Fukuzumi Shunichi , Kitano Toshiaki , Mochida Kunio 
Published: May 2006

Abstract
Photoinduced hydride reduction of an NAD+ analogue, 10-methylacridinium ion with permethylpolysilanes [Me3SiSiMe3, Me(SiMe2)Me, (Me2Si)6] acting as electron sources and water as a proton source occurs efficiently in acetonitrile under irradiation of visible light (λ &gt; 360 nm) to yield 9,10-dihydro-10-methylacridine selectively.
Addition Reaction of Sulfonyl Isocyanates to Benzocyclopropene
Authors: Kagabu Shinzo , Inoue Tatsuo 
Published: May 2006

Abstract
Benzocyclopropene reacted with methane- and n-butanesulfonyl isocyanates at room temperature, and arenesulfonyl isocyanates at 60 °C to afford the corresponding N-sulfonylphthalimidines.
Highly Enantio- and Diastereoselective Reduction of 2-Methyl-3-oxoalkanoic Acids by Use of Fermenting Bakers’ Yeast
Authors: Watabu Hisashi , Ohkubo Munemasa , Matsubara Hiroshi , Sakai Takashi , Tsuboi Sadao , Utaka Masanori 
Published: May 2006

Abstract
Reduction of 2-methyl-3-oxoalkanoic acids, RC(=O)CH(CH3)CO2H (R = n-C4H9 – n-C8H17), gave the corresponding (2R,3R)-anti-3-hydroxy-2-methylalkanoic acids by use of bakers’ yeast with &gt;98% ee and &gt;98% de.
Oxidative Coupling of Methane Followed by Ethane Pyrolysis
Authors: Mimoun Hubert , Robine Alain , Bonnaudet Serge , Cameron Charles J 
Published: May 2006

Abstract
When mixtures of methane, ethane and oxygen are cofed over oxidative coupling of methane catalysts, oxygen is preferentially consumed for the oxidative dehydrogenation of ethane, resulting in low methane conversions and high carbon monoxide production. If, however, ethane is added to the post-oxidation zone of the reactor, methane conversion remains high and the calories generated from this exothermic reaction can be used for the endothermic pyrolysis of ethane to form ethylene plus hydrogen.
First Syntheses of 1,4-Thiazino[3,4,5-cd]indolizine Derivatives
Authors: Kakehi Akikazu , Ito Suketaka , Hatanaka Susumu 
Published: May 2006

Abstract
Title compounds were prepared in moderate yields by the reactions of 3-(mercaptomethylene)-1-phenyl-2(3H)-indolizinones with bromoacetonitrile or phenacyl bromide in the presence of base.
Effect of the Phase Transition of Smectic Liquid-Crystalline Solvent on the Thermal Isomerization of 5,5′-Dialkylthioindigo Compounds
Authors: Fukunishi Koushi , Kitamura Satoshi , Kuwabara Masaki , Yamanaka Hiroki , Nomura Mototeru 
Published: May 2006

Abstract
The rates and the activation parameters for the thermal cis-to-trans isomerization of 5,5′-dialkylthioindigo dyes embedded in a smectic mesophase of butyl stearate were affected by the transition of the liquid-crystalline to the isotropic phase, depending upon the alkyl length.
Close Similarities of Chemical Structures between Light (Hexane-Soluble) and Heavy (Hexane-Insoluble and Benzene-Soluble) Fractions of Solvent-Refined Coal
Authors: Nomura Masakatsu , Ida Toru , Miyake Mikio , Kikukawa Takashi , Shimono Tatsuhisa 
Published: May 2006

Abstract
Curie-point pyrolysis-GC analyses were applied for structural analyses of hexane-soluble (HS) and hexane-insoluble and benzene-soluble (HI-BS) fractions from two SRC samples. Pyrograms of HS and HI-BS fractions are strikingly similar, indicating that they are composed of similar aromatic constituents, although the molecular weight distributions between the two fractions are different. The difference in coal rank for the two SRC samples was reflected as the profiles of pyrograms.
Oxidation of α-Methylstyrene to Phenylacrolein
Authors: Ai Mamoru 
Published: May 2006

Abstract
Various kinds of Mo-based oxides were tested as catalysts for the vapor-phase oxidation of α-methylstyrene to form phenylacrolein (atropoaldehyde). The best performance was obtained with the Te/Mo atomic ratio = 0.4 catalyst; the one-pass yield of phenylacrolein attained 48.5 mol% at the α-methylstyrene conversion of 96.3%.
Highly Heteroatom-dependent π-Facial Stereoselectivity in the Diels–Alder Reaction of 1,3-Cyclopentadienes Having a Heteroatom Substituent at 5-Position
Authors: Ishida Masaru , Aoyama Takamichi , Kato Shinzi 
Published: May 2006

Abstract
5-Phenylthio-1,3-cyclopentadiene reacted with maleic anhydride to give a 4 : 6 mixture of syn- and anti-attack adducts. In contrast, the selenium isologue, 5-phenylseleno-1,3-cyclopentadiene reacted with dienophiles with remarkable anti-π-facial selectivity to give the corresponding anti-attack adducts, exclusively.
The Structure of Nitro-5,10,15,20-tetraphenylporphyrinato(piperidine)cobalt(III)
Authors: Yamamoto Kenichi , Iitaka Yoichi 
Published: May 2006

Abstract
The structure of synthetic nitro-5,10,15,20-tetraphenylporphyrinato(piperidine)cobalt(III) has been determined by X-ray diffraction method. The results revealed that the porphyrin plane is markedly distorted to nonplanar due to the steric interaction between the axial piperidine and the porphyrin core.
Liquid Phase Methanol Synthesis on Copper and Zinc Ultrafine Particles Prepared by Gas Evaporation Method
Authors: Itoh Hiroyuki , Saito Toshiya , Shizuta Manabu , Kikuchi Eiichi 
Published: May 2006

Abstract
Liquid phase methanol synthesis was carried out over ultrafine particle (UFP) catalysts. A very high activity was obtained over Zn UFP modified using Cu acetylacetonate and LiAlH4. The rate of methanol formation on this catalyst at the steady state was about 1.8 times as high as that of a co-precipitated catalyst.
A Direct Formation of Alkenyl Chalcogenides from Nonactivated Alkenyl Halides and Diorganyl Dichalcogenides under Neutral Conditions
Authors: Ogawa Takuji , Hayami Kazuo , Suzuki Hitomi 
Published: May 2006

Abstract
Alkenyl sulfides and selenides were easily obtained in moderate to good yields by heating the corresponding bromides with diorganyl disulfides or diselenides in hexamethylphosphoric triamide with or without copper(I) iodide as a promoter.
Asymmetric [2+2] Cycloaddition Reaction Catalyzed by a Chiral Titanium Reagent
Authors: Hayashi Yujiro , Narasaka Koichi 
Published: May 2006

Abstract
Asymmetric [2+2] cycloaddition reaction between 3-(2-acryloyl)-1,3-oxazolidin-2-one derivatives and 1,1-bis(methylthio)ethylene proceeds by the use of a catalytic amount of a chiral titanium reagent to give the corresponding cyclobutanes in high enantioselectivity.
Stereoselective Synthesis of β-2-Deoxyribonucleosides from 1-O-Acetyl-3-O-[2-(methylsulfinyl)ethyl]-2-deoxyribose
Authors: Okauchi Tatsuo , Kubota Hideki , Narasaka Koichi 
Published: May 2006

Abstract
β-2-Deoxyribonucleosides are prepared stereoselectively from 1-O-acetyl-5-O-benzyl-3-O-[2-(methylsulfinyl)ethyl]-2-deoxy-D-erythro-pentofuranose by the reaction with the silyl or zinc derivatives of nucleoside bases in the presence of trimethylsilyl trifluoromethanesulfonate.
Molecular Discrimination by Water-soluble Cubic Azaparacyclophane
Authors: Murakami Yukito , Kikuchi Jun-ichi , Ohno Teruhisa , Hirayama Takayuki 
Published: May 2006

Abstract
A cubic cyclophane surrounded by six faces, each being constructed with the [3.3.3.3]azaparacyclophane ring, behaved as a polycationic host in acidic aqueous media and exhibited size-sensitive and regioselective molecular discrimination that originates from rigid geometry of its hydrophobic cavity.
A Highly Syn-selective Michael Reaction of Enamines with α,β-Unsaturated Esters via Cationic Intermediates
Authors: Hashimoto Yukihiko , Machida Shigeru , Saigo Kazuhiko , Inoue Jun-ya , Hasegawa Masaki 
Published: May 2006

Abstract
An efficient and highly diastereoselective Michael addition of enamines with 2,2-dimethoxyethyl esters of α,β-unsaturated acids was achieved by using titanium(IV) chloride as an activator.
Separation Behaviors of Aluminum(III) and Indium(III) Complexes with 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone in High-performance Liquid Chromatography
Authors: Akama Yoshifumi , Tong Aijun , Tanaka Shigeyuki 
Published: May 2006

Abstract
Aluminum- and indium-PMBP chelates were prepared and separated by liquid chromatography on an ODS column using acetonitrile as a mobile phase. The retention time of indium chelate varied significantly with a mobile phase of acetonitrile containing sodium chloride.
Regioselective Free Radical Alkylation of Uracils with Diacyl Peroxides
Authors: Itahara Toshio , Ide Naoko 
Published: May 2006

Abstract
Heating of a solution of uracils containing diacyl peroxides such as benzoyl peroxide, lauroyl peroxide, and 2,4-dichlorobenzoyl peroxide in 1,4-dioxane at 80 °C under nitrogen atmosphere yielded 5-(2,5-dioxanyl)uracils. Similar treatments of uracils in cyclohexane, cyclooctane, ethyl acetate, 1,2-diacetoxyethane, tert-butyl acetate, and acetonitrile gave the corresponding 5-alkyluracils.
Palladium(0) Catalyzed Hydrostannylation of Alkynes. Stereospecific Syn Addition of Tributyltin Hydride
Authors: Miyake Hideyoshi , Yamamura Kimiaki 
Published: May 2006

Abstract
Tetrakis(triphenylphosphine)palladium(0) catalyzes the hydrostannylation of alkynes to give vinylstannanes in excellent yields. This reaction proceeds in syn manner.
Novel Sulfur Transfer Reaction from 5H-Benzo[f]-1,2,3,4-tetrathiepin or 6H-Benzo[g]-1,2,3,4,5-pentathiocin to Olefins
Authors: Sato Ryu , Satoh Shin-ichi , Saito Minoru 
Published: May 2006

Abstract
Many olefins trapped active sulfur species generated from 5H-benzo[f]-1,2,3,4-tetrathiepin (BTTP) or 6H-benzo[g]-1,2,3,4,5-pentathiocin (BPTC) in DMSO to give [2+3], [4+2], or [6+3] cycloadducts.
Stereoselective Generation and Aldol Reaction of Tetrafluoropropanamide Boron Enolates Leading to threo-2-Fluoro-2-trifluoromethyl-3-hydroxy Alkanamides
Authors: Ishihara Takashi , Kuroboshi Manabu , Yamaguchi Koichi 
Published: May 2006

Abstract
Treatment of N,N-dialkyl-2-hydryltetrafluoropropanamide, readily available from hexafluoropropene and a secondary amine, with dibutylboryl triflate and ethyldiisopropylamine gave isomerically pure tetrafluoropropanamide boron enolate, which was allowed to react with various aldehydes at −10 °C to afford the corresponding threo-2-fluoro-2-trifluoromethyl-3-hydroxy alkanamides in good yields.
Efficient Method for the Preparation of (Z)-α-Alkoxy-β,γ-unsaturated Nitriles Starting from the Corresponding Acetals of (E)-Chalcone Derivatives
Authors: Mukaiyama Teruaki , Takenoshita Haruhiro , Yamada Masaaki , Soga Tsunehiko 
Published: May 2006

Abstract
In the presence of a catalytic amount of [Rh(COD)Cl]2 or trityl perchlorate, trimethylsilyl cyanide smoothly reacts with (E)-chalcone dimethyl acetal to yield (Z)-2,4-diphenyl-2-methoxy-3-butenenitrile accompanying isomerization of double bond.
Synthesis and Structure of Novel Organometallic Sulfide Cluster [(η5–C5Me5)MWO(μ–S2)(μ–S)2]2 (M = Rh, Ir) Containing High-Valent Tungsten Atoms
Authors: Ozawa Yoshiki , Hayashi Yoshihito , Isobe Kiyoshi 
Published: May 2006

Abstract
Novel transition metal sulfide cluster [(η5–C5Me5)MWO(μ–S2)(μ–S)2]2 (M = Rh, Ir) was synthesized and the crystal structure of iridium complex was analyzed. The cluster consists of two fused double incomplete-cubane frameworks made of tungsten(VI) and iridium(III) atoms. There are no metal–metal direct interactions within the cluster core in spite of short W–Ir contact of 2.816(1) Å.
Bilayer Membranes of Four-Chained Ammonium Amphiphiles
Authors: Kimizuka Nobuo , Ohira Hiroyuki , Tanaka Miho , Kunitake Toyoki 
Published: May 2006

Abstract
Novel amphiphiles in which four long alkyl chains are connected to the single trimethylammonium head group via amino acid residues gave clear dispersions upon sonication. Formation of bilayer membranes was confirmed by electron microscopy, differential scanning calorimetry, and fluorescence depolarization.
Flash Pyrolytic Study on Chemical Structures of Akabira Coal Extracts and Residue
Authors: Matsubayashi Kenji , Nomura Masakatsu , Miyake Mikio 
Published: May 2006

Abstract
Akabira coal extracts [Pyridine soluble fraction (PS) and Acetone soluble fraction (AS)] and residue [CS2–N–methyl-2-pyrrolidone (NMP) insoluble fraction (Residue)] were analyzed to get detailed information about components contained in three fractions using Curie-Point Pyrolyser–GC (Py–GC) and –GC-MS (Py–GC–MS). The pyrograms obtained from these fractions by Py–GC showed close similarities among them. The examination by Py–GC–MS resulted in the identification of 130 compounds.
Regioselective Introduction of Allylic Groups into the C-2 or C-3 Position of Furanoside Rings
Authors: Ohmori Junya , Shiotani Tohru , Mitsunobu Oyo 
Published: May 2006

Abstract
The reaction of α-anomers of methyl 2,3-anhydro-D-ribo- and D-allo-furanosides with allylic Grignard reagents predominantly gave the corresponding 2-deoxy-2-C-alkenylfuranosides. In contrast, their β-anomers selectively gave 3-C-alkenyl derivatives. Preparation of a synthon of the C-4∼C-9 fragment common to various 16-member macrolide antibiotics is also described.
Synthesis of Levoglucosenone
Authors: Shibagaki Makoto , Takahashi Kyoko , Kuno Hideyuki , Honda Ichiro , Matsushita Hajime 
Published: May 2006

Abstract
Levoglucosenone was synthesized from D-galactose via reductive decarboxylation as a key reaction. Among the catalysts used for the key reaction, hydrous zirconium oxide was found to have the best activity.
Regiospecific Synthesis of 1-Substituted 1,2,4-Triazoles by Reaction of 1,2,4-Triazole with Aldehydes
Authors: Smith Keith , Hammond Mark E W , James D Martin , Ellison Ian J , Hutchings Michael G 
Published: May 2006

Abstract
The reactions of 1,2,4-triazole with aldehydes and various acid chlorides provide a convenient, regiospecific route to 1-substituted 1,2,4-triazoles.
Specific Fluorescence Detection of Lithium Ion with 2,9-Disubstituted 1,10-Phenanthroline Derivatives
Authors: Hiratani Kazuhisa , Nomoto Masayo , Sugihara Hideki , Okada Tatsuhiro 
Published: May 2006

Abstract
The fluorescence intensity of 2,9-di-n-butyl-1,10-phenanthroline was drastically enhanced in the presence of lithium ion, but not sodium, potassium, and beryllium ions.
Synthesis of Renin Inhibitors Containing a Sulfonemethylene Isostere at Their N-Terminals
Authors: Nakano Masato , Atsuumi Shugo , Koike Yutaka , Tanaka Seiichi , Funabashi Hiroshi , Hashimoto Junko , Ohkubo Mitsuru , Morishima Hajime 
Published: May 2006

Abstract
We describe an efficient synthesis of highly active renin inhibitors containing a sulfonemethylene isostere at their N-terminals and a hydroxyethylene isostere at their C-terminals. The stereospecific synthesis of N-terminal key intermediate, L-N-[(2R)-2-benzyl(or 1-naphthylmethyl)-3-hydroxypropionyl]norleucine t-butyl ester is described.
Stereochemistry of Asymmetric 1,2-Rearrangements of Chiral Sulfenylcyclopropanes into Cyclobutane Derivatives. A Novel Entry to Chiral Cyclobutane Systems Using Chiral Sulfinyl Groups
Authors: Hiroi Kunio , Ogata Takenobu 
Published: May 2006

Abstract
Stereochemistry of 1,2-rearrangements in optically active 1-(1-hydroxyalkyl)-1-sulfenylcyclopropane derivatives was determined. Both of the enantiomers underwent smoothly a 1,2-rearrangement of carbon-carbon bonds in cyclopropanes via the mesylates with complete stereospecificity to provide chiral cyclobutane derivatives with high enantiomeric excess.
An Efficient and Stereoselective Synthesis of the 1β-Methylcarbapenem Key Precursor
Authors: Honda Toshio , Wang Tzu-Chueh , Chu Shih-Der 
Published: May 2006

Abstract
The key precursor for the preparation of 1β-methylcarbapenem antibiotic was stereoselectively synthesized from (+)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone by employing an intermolecular carbenoid displacement reaction as a key step.
Synthesis, Properties, and Molecular Structure of Tetrakis(pentamethyldisilanyl)ethylene
Authors: Sekiguchi Akira , Ebata Keisuke , Kabuto Chizuko , Sakurai Hideki 
Published: May 2006

Abstract
The title compound and the related poly(disilanyl)ethylenes were prepared by the reaction of 1,2-bis(bromodimethylsilyl)-1,2-bis(chlorodimethylsilyl)ethylene with trimethylsilyllithium in HMPA/THF. The physical properties of the title compound as well as its molecular structure by X-ray diffraction are described.
1,5-Diselenacyclooctane. Reversible Electrochemical Oxidation with Remarkably Low Oxidation Potential in Dialkyl Selenides
Authors: Fujihara Hisashi , Akaishi Ryouichi , Furukawa Naomichi 
Published: May 2006

Abstract
The electrochemical oxidation of dialkyl selenides was studied by cyclic voltammetry. The cyclic voltammogram of a new cyclic bis-selenide, 1,5-diselenacyclooctane shows one reversible oxidation wave with remarkably low oxidation potential.