bluuebunny/crossref_metadata_2025_split huggingface dataset:
THE HIGHLY STEREOSELECTIVE SYNTHESIS OF CIS-VINYLOXIRANES
Authors: Yamaguchi Masahiko , Mukaiyama Teruaki 
Published: July 2006

Abstract
In the presence of triethylaluminum, oxyallyl anions derived from 2-allyloxybenzimidazoles react with aldehydes in highly regio-and stereoselective manner to afford α-adducts in good yields. The adducts are stereospecifically converted to cis-vinyloxiranes in good yields.
A NEW METHOD FOR THE GENERATION OF A BORON ENOLATE OF AN ESTER—A NEW SYNTHESIS OF 2-DEOXY-d-RIBOSE—
Authors: Murakami Masahiro , Mukaiyama Teruaki 
Published: July 2006

Abstract
A boron enolate of an ester was generated in situ by the treatment of ethoxyacetylene with mercury(II) acetate and diphenylborinic acid, and the boron enolate thus formed further reacted with aldehydes to give β-hydroxyesters and β-acetoxyesters in good yields. The reaction was successfully applied to the stereoselective synthesis of 2-deoxy-d-ribose.
NEW POLY- AND BIS(THIACROWN ETHER)S AS EXTRACTION REAGENTS
Authors: Oue Masatoshi , Ishigaki Akira , Matsui Yousuke , Maeda Takumi , Kimura Keiichi , Shono Toshiyuki 
Published: July 2006

Abstract
New poly- and bis(thiacrown ether)s containing two oxygen atoms and three to four sulfur atoms in the polyether-polysulfide ring have been synthesized, and they were found to bind silver picrate effectively compared with their monocyclic analogs.
ESR MEASUREMENTS OF INTERACTION BETWEEN Mn2+ AND PROTEINS. A NEW METHOD FOR ANALYSIS OF EXPOSED CHARGED RESIDUES
Authors: Nishihara Shoko , Watanabe Tokuko , Arata Yoji 
Published: July 2006

Abstract
A new method, which is based on the use of Mn2+ ion as an ESR probe, has been developed to examine the number of charged residues on the surface of protein. Results obtained using this method will be briefly discussed for several kinds of proteins.
DEOXYOKAMURALLENE AND ISOOKAMURALLENE, NEW HALOGENATED NONTERPENOID C15-COMPOUNDS FROM THE RED ALGA LAURENCIA OKAMURAI YAMADA
Authors: Suzuki Minoru , Kurosawa Etsuro 
Published: July 2006

Abstract
Two new C15-bromoallenes, deoxyokamurallene and isookamurallene, have been isolated from the title alga, and their structures were determined on the basis of their spectroscopic evidence.
CARBOALUMINATION OF ALKYNES WITH DIALKYLCHLOROALANES IN THE PRESENCE OF ZIRCONOCENE DICHLORIDE. AN IMPROVED METHOD FOR CARBOALUMINATION OF ALKYNES
Authors: Yoshida Tadao 
Published: July 2006

Abstract
In the presence of zirconocene dichloride, treatment of alkynes with dialkylchloroalanes followed by iodination gave the corresponding alkenyl iodides in good yields.
HYDROGENATION OF CARBON MONOXIDE TO OLEFINS CATALYZED BY BIS(2,4-PENTADIONATE)COBALT-LITHIUM ALUMINUM HYDRIDE SYSTEM IN LIQUID PHASE
Authors: Mitsudo Take-aki , Komiya Yukiatsu , Watanabe Yoshihisa 
Published: July 2006

Abstract
Bis(2,4-pentadionate)cobalt-lithium aluminum hydride system in tetrahydrofuran-tetralin is active for a catalytic hydrogenation of carbon monoxide to lower linear hydrocarbons, the distribution of which has a maximum at less than C6 with 85% of selectivity for olefins.
ELECTROCHEMICAL REFERENCE ELECTRODE FOR THE ION-SELECTIVE FIELD EFFECT TRANSISTOR
Authors: Tahara Shu , Yoshii Mitsuyoshi , Oka Syotaro 
Published: July 2006

Abstract
By means of the monolithic integrated circuit techniques with the plasma polymerization method, a reference field effect transistor (REFET) has been developed to be used with the ion-selective field effect transistors (ISFET’s). The gate insulator of the REFET is coated with a plasma polymerized styrene film. It was used in combination with the pH-ISFET to determine pH values. Experimental results compared favorably with those from the convetional glass electrode method.
ANALYSIS OF RADICAL OLIGOMERIZATION OF STYRENE BY FIELD DESORPTION MASS SPECTROMETRY
Authors: Saito Jun , Hara Junji , Toda Shozo , Tanaka Shigeyuki 
Published: July 2006

Abstract
The mechanism of thermally initiated polymerization of styrene has been investigated by field desorption mass spectrometry. Most of molecular ion peaks of styrene oligomers have been assigned to a few repetitive units of styrene with additive groups. As a result, it is concluded that the cleavage of styrene dimers to phenylpropenyl and benzyl radicals should contribute to the chain transfer and the reinitiation mechanisms of styrene polymerization.
γ-CYCLODEXTRIN-ENHANCED EXCIMER FLUORESCENCE OF PYRENE AND EFFECT OF n-BUTYL ALCOHOL
Authors: Kano Koji , Takenoshita Itsuro , Ogawa Teiichiro 
Published: July 2006

Abstract
The fluorescence of pyrene has been measured in aqueous solutions in the presence of γ-cyclodextrin. The excimer emission of pyrene was enhanced upon addition of γ-cyclodextrin, indicating the formation of the 2:1 complex of pyrene with γ-cyclodextrin which degraded upon addition of n-butyl alcohol to yield the more stable three-component complex of pyrene, n-butyl alcohol, and γ-cyclodextrin.
MONORADICAL REARRANGEMENT OF 1,4-BIRADICALS INVOLVED IN NORRISH TYPE II PHOTOREACTION OF METHANONAPHTHOQUINONES
Authors: Osuka Atsuhiro , Shimizu Hirohito , Suzuki Hitomi , Maruyama Kazuhiro 
Published: July 2006

Abstract
Type II photoreaction of the title compound gave a cyolobutanol by cyclization, an unsaturated keto alcohol by reverse disproportionation, and a bicyclic diketone by cyclopropylcarbinyl rearrangement. Relative rates of the type II biradical reactions were estimated on the basis of the product analysis.
DIANION OF 2-(METHYLTHIO)-4-PENTENOIC ACID: A USEFUL REAGENT FOR THE PREPARATION OF 5-METHYLENE-2(5H)-FURANONES
Authors: Tanaka Kazuhiko , Terauchi Makoto , Kaji Aritsune 
Published: July 2006

Abstract
A general and mild approach to 5-methylene-2(5H)-furanones has been demonstrated, which involves (a) the alkylation of dianion of 2-(methylthio)-4-pentenoic acid, (b) the cyclization followed by dehydrosulfenylation, and (c) the facile dehydroiodination by Na2CO3.
STANNOUS TRIFLATE: A NEW ALDOL REACTION VIA DIVALENT TIN ENOLATES
Authors: Mukaiyama Teruaki , Stevens Rodney W , Iwasawa Nobuharu 
Published: July 2006

Abstract
Divalent tin enolates formed from stannous triflate and ketones react with carbonyl compounds under mild conditions to give the corresponding aldol products in good yields. In the case of cross-coupling with aldehydes, good to excellent erythro-selectivity was observed.
A ONE-STEP SYNTHESIS OF PURINE DERIVATIVES BY THE REACTION OF PHENYLAZOMALONAMIDAMIDINE WITH ARYL ALDEHYDES
Authors: Yoneda Fumio , Koga Ryosuke , Higuchi Masatsugu 
Published: July 2006

Abstract
Treatment of phenylazomalonamidamidine (I) with aryl aldehydes yielded the corresponding 2,8-diarylhypoxanthines (II) in a single step. The reaction under milder conditions formed the intermediary monoarylidene derivatives (III) of I, from which the corresponding 6-amino-2-aryl-5-phenylazopyrimidine-4(3H)-ones (IV) were obtained by the oxidative cyclization with diethyl azodicarboxylate. Treatment of IV with second aryl aldehydes gave the unsymmetrical 2,8-diarylated hypoxanthines.
CYCLOREVERSION OF CIS-1,2-DINAPHTHYLCYCLOBUTANE VIA EXCIPLEX WITH TRIETHYLAMINE. SOLVENT EFFECT ON THE MODE OF CYCLOREVERSION
Authors: Takamuku Setsuo , Kuroda Takayuki , Sakurai Hiroshi 
Published: July 2006

Abstract
t-3, t-4-Di (2-naphthyl)-r-1,c-2-dimethoxycarbonylcyclobutane (DDCB), when irradiated in the presence of triethylamine, undergoes cycloreversion via the exciplex and/or the ion-pair. The mode of cycloreversion changes with the solvent polarity, reflecting the electronic structure of the intermediates.
Ru(bpy)32+ SENSITIZED PHOTOOXIDATION REACTION OF cis-STILBENES NOVEL PRODUCTS FORMATION
Authors: Futamura Shigeru , Ohta Hiroyuki , Kamiya Yoshio 
Published: July 2006

Abstract
Ru(bpy)32+ sensitized photooxidation of cis-stilbenes in acetonitrile gave novel [2+6] cycloadducts. Product distribution changed remarkably depending on sensitizers.
CATALYST EFFECT ON THE SYNTHESIS OF ETHYL ACETATE VIA REDUCTIVE CARBONYLATION OF METHYL ACETATE
Authors: Kheradmand Houchang , Jenner Gérard , Kiennemann Alain , Deluzarche Antonin 
Published: July 2006

Abstract
The effect of several catalysts and binary catalyst mixtures is examined in the formation of ethyl acetate from methyl acetate in presence of CO–H2. The most effective catalytic system is a combination of ruthenium-cobalt compounds. The optimum conversion and selectivity to ethyl acetate is achieved with an atomic ratio Co/Ru = 0.4.
ON THE NATURE OF THE BONDING IN AND REACTIVITY OF SILICA GEL SUPPORTED PERMANGANATE
Authors: Jazzaa Abdulaziz Al , Clark James H , Robertson Malcolm 
Published: July 2006

Abstract
Infrared spectroscopic studies of silica gel supported permanganate reveal the presence of a discrete physisorbed salt monolayer which is thought to be responsible for the observed enhancement in permanganate reactivity.
PHOTOCATALYTIC OXYGEN EVOLUTION FROM TiO2 POWDER-WATER-HALATE SYSTEMS
Authors: Oosawa Yoshinao 
Published: July 2006

Abstract
Oxygen evolves easily on irradiation(&gt;300 nm) from aqueous solutions of BrO3− and IO3− in the presence of TiO2 around room temperature. By the introduction of this process, the maximum temperature required for several thermochemical cycles for water decomposition is expected to decrease greatly.
OLEFINATION OF KETONES USING 1,1-DIMETALLOALKANES DERIVED FROM i-Bu2AlCH=CHR - Cl2TiCp2 SYSTEM
Authors: Yoshida Tadao 
Published: July 2006

Abstract
The alkylidenation of ketone carbonyls using 1,1-dimetalloalkanes prepared by the reaction of 1-alkenyldiisobutylalanes with titanocene dichloride afforded the corresponding olefins in good yields.
HETEROGENEOUS–HOMOGENEOUS MECHANISM FOR VAPOR-PHASE CATALYTIC OXIDATIVE DEHYDROGENATION OF ETHYLBENZENE BY CARBONYL SULFIDE
Authors: Akimoto Masamichi , Yamagami Koji , Echigoya Etsuro 
Published: July 2006

Abstract
A mechanistic study on vapor-phase oxidative dehydrogenation of ethylbenzene to styrene by COS over SiO2,Al2O3,MgO,and TiO2 catalysts has been carried out. The results obtained indicate that the sulfur evolved by the heterogeneous catalytic decomposition of COS dehydrogenated ethylbenzene in the homogeneous phase.
ROLE OF TRANSITION METAL ELEMENTS IN Te–Mo–M–O CATALYSTS AS REVEALED BY THE OXIDATION OF PROPYLENE TO ACROLEIN WITH 18O2 TRACER
Authors: Ueda Wataru , Moro-oka Yoshihiko , Ikawa Tsuneo 
Published: July 2006

Abstract
Participation of the lattice oxide ions in various tellurium-based multicomponent oxide catalysts, Te–Mo–M–O (M = Co, Mn, Fe and Cu) was investigated using 18O2 tracer in the selective oxidation of propylene to acrolein. High mobility of the lattice oxide ions in this system plays an important role in stabilizing the active site for the redox process and in suppressing the vaporization of tellurium metal from the catalyst during the reaction.
PHOTORESPONSIVE CRYPTAND WITH AN AZOPYRIDINE-BRIDGE
Authors: Shinkai Seiji , Minami Takahide , Kouno Takeshi , Kusano Yumiko , Manabe Osamu 
Published: July 2006

Abstract
A new photoresponsive “cryptand” with an azopyridine-bridge (2) was synthesized. Trans-(2) was able to extract heavy metal ions (Cu2+, Ni2+, Co2+, and Hg2+) from aqueous solution to organic (o-dichlorobenzene +n-butyl alcohol) phase, whereas photoisomerized cis-(2) scarcely extracted heavy metal ions. The difference is rationalized in terms of the structural change of the azopyridine-bridge which is induced by photo(u.v.)-irradiation.
EXTRACTION OF GALLIUM(III) FROM ALKALINE SOLUTIONS BY ALKYLATED HYDROXYQUINOLINE
Authors: Sato Taichi , Nakamura Takato , Yabuta Mitsuo , Oishi Hiroyuki 
Published: July 2006

Abstract
The distribution equilibrium of gallium(III) between aqueous sodium hydroxide solutions and solutions of 7-(5,5,7,7-tetramethyl-1-octen-3-yl)-8-hydroxyquinoline (KELEX 100) in kerosene has been examined under different conditions. As a result, it is confirmed that the extraction of gallium(III) proceeds in a cation exchane reaction.
VERSATILE POLYMER-BOUND RHODIUM CATALYSTS. FACILE HYDROGENATION OF AROMATIC COMPOUNDS IN THE LIQUID PHASE
Authors: Okano Tamon , Tsukiyama Katsunori , Konishi Hisatoshi , Kiji Jitsuo 
Published: July 2006

Abstract
Immobilized complexes prepared from [RhCl(nbd)]2 (nbd = norbornadiene) and phosphinated polydiacetylene or silica are efficient catalysts for the hydrogenation of arenes under mild conditions. However, the homologous catalyst supported on a phosphinated polystyrene is not active.
THE PALLADIUM(0)-CATALYZED REDUCTIVE COUPLING OF HALIDES USING sym-DICHLOROTETRAMETHYLDISILANE AS A REDUCING AGENT
Authors: Nakano Taichi , Takahashi Masatoshi , Ashizawa Toshiyuki , Arai Takeshi , Seki Shinji , Matsumoto Hideyuki , Nagai Yoichiro 
Published: July 2006

Abstract
The reaction of benzylidene chlorides as well as 1,2-dihalogeno-1,2-diphenylethanes with sym-dichlorotetramethyldisilane in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) gave aryl-substituted ethenes in good yields.
MEASUREMENT OF INFRARED SPECTRA OF SURFACE SPECIES FOR NO2–C3H6–ZnO SYSTEM UNDER PHOTOIRRADIATION
Authors: Ibusuki Takashi , Izawa Nobuyuki , Takeuchi Koji 
Published: July 2006

Abstract
A reaction cell for measurement of ir spectra of surface species on solid catalysts under photoirradiation is developed and is applied to NO2–C3H6–ZnO system. A remarkable change in ir spectra of NO2 adsorbed on ZnO with photoirradiation is satisfactorily observed and is briefly discussed.
RAMAN CIRCULAR INTENSITY DIFFERENTIAL SPECTRA OF METHYL ORANGE INDUCED BY INCLUSION IN CYCLODEXTRIN
Authors: Higuchi Seiichiro , Tanaka Kozo , Tanaka Shigeyuki 
Published: July 2006

Abstract
Raman circular intensity differential spectra were measured for the aqueous dilute solution of methyl orange and α-cyclodextrin, making use of the resonance Raman effect. The obtained spectra were discussed in terms of the vibrational optical activity induced by the inclusion of methyl orange in α-cyclodextrin.
THE STEREOSPECIFIC HYDROXYLATION OF ENDOCYCLIC ETHYLENIC LINKAGE IN THE BIOTRANSFORMATION OF α-TERPINYL ACETATE WITH CULTURED SUSPENSION CELLS OF NICOTIANA TABACUM
Authors: Hirata Toshifumi , Lee Ym Sook , Suga Takayuki 
Published: July 2006

Abstract
The biotransformation of (±)-8-acetoxy-p-menth-1-ene (α-terpinyl acetate) with the cultured cells of Nicotiana tabacum was found to result in the predominant formation of 8-acetoxy-c-4-p-menthane-r-1,t-2-diol. This experimental result indicates that the hydroxylation of the endocyclic ethylenic linkage with the cultured suspension cells is stereospecific.
A NOVEL METHOD FOR THE SYNTHESIS OF 2-DEOXYDISACCHARIDE BY STEREOSELECTIVE CYCLIZATION OF THE ACYCLIC PRECURSOR
Authors: Suzuki Keisuke , Mukaiyama Teruaki 
Published: July 2006

Abstract
Stereoselective cyclization of (Z)-(2R,3R,4R)-6-cyclohexyloxy-1,3,4-tribenzyloxy-5-hexen-2-ol (1)promoted by Hg(OCOCF3)2, followed by reductive work up gave the 2-deoxy-α-hexopyranoside derivative almost exclusively. On the other hand, a predominant formation of the β-anomer was achieved by the treatment of 1 with PhSeCl, and the successive deselenation.
REDUCTION OF CONJUGATED DIENOIC CARBOXYLIC ACIDS AND ESTERS WITH SODIUM DITHIONITE
Authors: Camps Francisco , Coll José , Guerrero Angel , Guitart Josefa , Riba Magi 
Published: July 2006

Abstract
Reduction of 2,4-alkadienoic acids and esters with sodium dithionite was carried out in aqueous solution or under PTC conditions to give, almost exclusively, Z:E isomeric mixtures of the corresponding 3-alkenoic acids and esters, respectively, in good yields.
ORGANIC METALS: ELECTROCRYSTALLIZATION OF THE COMPLEXES OF NAPHTHACENO[5,6-cd:11,12-c′d′]BIS[1,2]DITHIOLE AND THEIR ELECTRICAL CONDUCTIVITIES
Authors: Tanaka Hidekazu , Nogami Takashi , Mikawa Hiroshi 
Published: July 2006

Abstract
The complexes of naphthaceno[5,6-cd:11,12-c′d′]bis[1,2]dithiole with inorganic anions (Cl−, Br−, I−, Clo4−, BF4−, PF6−, and SbF6−) were obtained as crystals by an electrochemical technique. The temperature dependences of their electrical conductivities were measured. The PF6 complexes showed 762 (Ω cm)−1 at room temperature, and it was metallic above 220 K.
A NEW METHOD ON THE DETERMINATION OF HEAT CHANGE IN SOLVENT EXTRACTION OF METALS. THE EXTRACTION OF ZINC(II) FROM HYDROCHLORIC ACID SOLUTIONS BY TRIOCTYLMETHYLAMMONIUM CHLORIDE
Authors: Sato Taichi , Nakamura Takato , Kuwahara Masami 
Published: July 2006

Abstract
To measure directly the heat change associated with the extraction of zinc(II) from hydrochloric acid solutions by trioctylmethylammonium chloride (TOMAC) in benzene has been succeeded by using twin type isoperibol calorimeter. It is proved that the heat change depends on the concentration of acid in aqueous phase.
THE EFFECTS OF SIZE AND DONOR ATOMS OF MACROCYCLIC POLYAMINES BINDING TO Mg2+ AND Ca2+
Authors: Fujioka Haruto , Kimura Eiichi , Kodama Mutsuo 
Published: July 2006

Abstract
New macrocyclic polyamines L2–L5 have been synthesized to develop sequestering agents selective for Na+, K+, Mg2+ and Ca2+ ions in aqueous solutions. 18-membered hexadentate ligands L2 and L3 show specificity toward Ca2+, whereas a 16-membered pentaamine with an amine branch (L4) bind only to Mg2+.
PHOTODIMERISATIONSPRODUKTE VON STYRYL-α-PYRONEN DES YANGONIN-TYPS
Authors: Achenbach Hans , Schaller Egmont , Regel Walter 
Published: July 2006

Abstract
The photoinduced dimerization of the crystalline yangonin-type pyrones Ia and Ib was studied using 2H-labelled compounds. 1H-nmr of the dimerization products revealed their structures to be IIa and lIb respectively.
FORMATION OF ETA ALUMINA BY ANODIC OXIDATION OF ALUMINUM
Authors: Yamada Midori , Mita Ikuo 
Published: July 2006

Abstract
Anodic oxidation of aluminum was carried out in sodium carbonate alone, or in addition with sodium fluoride, sodium chloride, or sodium iodide at 303–353 K with a direct constant voltage of 150 V. Anodic oxidation proceeded with sparking for 120–300 s, and a white coatings of 5–9 μm thickness was formed. This coatings was identified as eta alumina of high crystallinity by X-ray analysis.
ELECTROPHILIC SUBSTITUTION OF N-METHYLOCTAETHYLPORPHYRIN
Authors: Toi Hiroo , Kitamura Satoru , Aoyama Yasuhiro , Ogoshi Hisanobu 
Published: July 2006

Abstract
Nitration of N-methyloctaethylporphyrin (1) takes place at the meso positions adjacent to the N-alkylated pyrrole ring (so-called α- or δ-position). Deuteration with CF3COOD-D2SO4 suggests preferential electrophilic substitution at α- or δ-position on the basis of 1H-nmr investigation.
ESTIMATION OF THE STEREOSELECTIVITY OF SOME REACTIONS ON ALKYL 1-PHENYLETHYL SULFIDES AND KETONES BY MOLECULAR FORCE FIELD CALCULATIONS
Authors: Hirota Minoru , Abe Kazuhisa , Tashiro Hiroshi , Nishio Motohiro 
Published: July 2006

Abstract
The stereoisomeric(threo/erythro) ratios of the reaction products were estimated from the conformational ratios of the reactant calculated by molecular force field approach. Examples of the oxidation to sulfoxides of alkyl 1-phenylethyl sulfides and the hydride reduction of alkyl 1-phenylethyl ketones were given.
UNSATURATED CROWN ETHERS: STILBENO-CROWN ETHERS
Authors: Inoue Yoshihisa , Ouchi Mikio , Nakazato Toshiyo , Matsuda Takashi , Hakushi Tadao 
Published: July 2006

Abstract
Stilbenocrown ethers 3a,c and 4a,b were synthesized in a cyclization reaction of benzoin with oligoethylene glycol ditosylates(2a-c) under a phase-transfer condition. Extractions of aqueous alkali picrates(Na+–Cs+) were examined with the distilbenocrown ethers 4a,b, the partially-hydrogenated tetraphenylcrown ethers 6a,b and the fully-hydrogenated tetracyclohexylcrown ethers 7a,b.
STUDIES ON THE CHEMICAL EFFECTS OF THE 6Li(n,α)T REACTION IN TRIS(OXALATO)FERRATE(III) CRYSTALS
Authors: Akashi Junko , Katada Motomi , Sano Hirotoshi 
Published: July 2006

Abstract
Chemical effects of the neutron irradiation of Li3[Fe(C2O4)3]·4.5H2O and (NH4)3[Fe(C2O4)3]·3H2O were studied by means of Mössbauer spectroscopy. No significant change was found in the neutron-irradiated (NH4)3[Fe(C2O4)3]·3H2O, while Fe(II) species were observed to be produced by the 6Li(n,α)T reaction in the neutron-irradiated Li3[Fe(C2O4)3]·4.5H2O.
STUDIES ON THE PHASE TRANSITION NEAR THE MELTING POINTS IN ACETYL AND CARBOXYL FERROCENES
Authors: Sato Kumiko , Konno Michiko , Sano Hirotoshi 
Published: July 2006

Abstract
Phase transitions were found in the entitled compounds near the melting points by means of Mössbauer spectroscopic study. In order to investigate the phase transition, the crystal structure of mcnoacetylferrocene was determined by X-ray diffraction at room temperature and oscillation and Weissenberg photographs were taken at high temperatures. The phase transition was also confirmed by differential thermal analysis.
PEPTIDE SYNTHESIS BY USING N-ACYLPHOSPHORAMIDITES
Authors: Kawanobe Wataru , Yamaguchi Kazuo , Nakahama Seiichi , Yamazaki Noboru 
Published: July 2006

Abstract
New trivalent phosphorus compounds, N-acetyl-N-methylphosphoramidites were prepared readily in good yield by the reaction of phosphorous chlorides and N-methylacetamide. By using the phosphoramidites as condensing agents, Young’s peptide and prolyl-leucyl-glycinamede(MSH-RIF) were synthesized without racemization in high yields under mild conditions.
REGIOSELECTIVE OXIDATION OF INTERNAL OLEFINS BEARING NEIGHBORING OXYGEN FUNCTIONS BY MEANS OF PALLADIUM CATALYSTS. A DIRECT PREPARATION OF γ-KETO ESTERS AND 1,4-DIKETONES FROM β,γ-UNSATURATED ESTERS AND KETONES
Authors: Nagashima Hideo , Sakai Kiyomi , Tsuji Jiro 
Published: July 2006

Abstract
γ-Keto esters and 1,4-diketones were prepared by the palladium-catalyzed regioselective oxidation of β,γ-unsaturated esters and ketones. The best yields were obtained when the reaction was carried out using PdCl2/CuCl/O2 catalyst system in aqueous dioxane.
SYNTHESIS AND PROPERTIES OF 5-(1,3-DITHIOL-2-YLIDENE)-2(5H)-THIOPHENONE
Authors: Takahashi Kazuko , Nishijima Kazumi , Takase Kahei , Shimozawa Takashi 
Published: July 2006

Abstract
The title compound and its phenyl derivatives have been prepared by the advantageous route which we have developed. These cross-conjugated compounds are suggested to have a preferable contribution of the quinonoid resonance structure at the ground state, but are slightly more polar than the iso-π-electronic 5-cycloheptatrienylidene-2(5H)-thiophenone, revealing that the dithiolidene residue is more electron-donating than the cycloheptatrienylidene one.
FERN CONSTITUENTS: NEW CYCLOARTANE TRITERPENOIDS, (24R)-CYCLOLAUDENYL ACETATE AND (24R)-CYCLOMARGENYL ACETATE, AND THEIR CORRESPONDING ALCOHOLS AND KETONES, ISOLATED FROM POLYPODIUM FORMOSANUM
Authors: Ageta Hiroyuki , Arai Yoko 
Published: July 2006

Abstract
New tetracyclic triterpenoids, (24R)-cyclolaudenyl acetate(Ia) and (24R)-cyclomargenyl acetate(Ib), and their corresponding alcohols(IIa, IIb) and ketones(IIIa,IIIb) were isolated from the rhizomes of Polypodium formosanum. The structure of Ia and Ib were deduced by chemical and spectroscopic methods to be (24R)-24-methylcycloart-25-en-3β-yl acetate and (24R)-24-ethylcycloart-25-en-3β-yl acetate, respectively.
STERIC ASPECTS OF THE OXIDATION OF THIOKETONES BY SINGLET OXYGEN
Authors: Ramnath Narayan , Rao Vaidhya Jayathertha , Ramesh Varadaraj , Ramamurthy Vaidhyanathan 
Published: July 2006

Abstract
Singlet oxygen oxidation of dialkyl thioketones yields the corresponding ketones and in some cases sulfoxides in varying amounts. Steric considerations on the reactive zwitterionic/diradical intermediates have been invoked to rationalise the product distribution.
SENSITIZED PHOTOLYSIS OF BENZOYL AZIDE. A NITRENE SINGLET-TRIPLET EQUILIBRIUM
Authors: Inagaki Masao , Shingaki Tadao , Nagai Toshikazu 
Published: July 2006

Abstract
The acetophenone-sensitized photolyses of benzoyl azide in cis-and trans-1,4-dimethylcyclohexanes gave the N-substituted benzamides stereospecifically. The photolyses in 2,3-dimethylbutane showed the same insertion regioselectivity ratio toward the C–H bonds as that of singlet benzoylnitrene in the direct photolysis. These facts indicate the existence of the singlet nitrene despite the triplet photosensitization and provide a chemical evidence for the establishment of a singlet-triplet equilibrium for benzoylnitrene.