bluuebunny/crossref_metadata_2025 huggingface dataset:
SECONDARY ION MASS SPECTROMETRY/METASTABLE ION SPECTRA OBTAINED BY LINKED SCAN TECHNIQUE AND FIELD DESORPTION MASS SPECTRA OF NONELECTROLYTE COMPLEXES, [RuCl2(bpy)2] AND [RuCl2(phen)2]
Authors: Tanaka Mikio , Miki Eiichi
Published: July 2006

The relative intensities of molecular ions and their isotopic peaks generated from the titled complexes were measured accurately by field desorption mass spectrometry. Secondary ion mass spectrometry/metastable ion spectra obtained by the linked scan technique gave useful information about the successive ligand-loss processes.
SYNTHESES AND PROPERTIES OF α- OR β-METHYL SUBSTITUTED BISDEHYDROAZA[14]-, AZA[16]-, AND AZA[18]ANNULENE
Authors: Ojima Juro , Yagi Yasuhiro , Nakada Tetsuya , Manaka Sumio , Ejiri Emiko , Ishizaka Shuichi , Shiraiwa Yasunao
Published: July 2006

14-Ethoxy-2,5,10-trimethyl-, 14-ethoxy-2-ethyl-5,10-dimethyl-6,8-bisdehydroaza[14]annulene, 2-ethoxy-3,6,11-trimethyl-, 2-ethoxy-6,11,16-trimethyl- 7,9-bisdehydroaza [16] annulene, and 18-ethoxy-2,7,12-trimethyl-8,10-bisdehydroaza[18]annulene were prepared. It was found that the molecular skeletons of these α- or β-methylated azaannulenes are less planar than those of α- or β-methyl unsubstituted ones.
CHLORINATIVE CLEAVAGE OF PERMETHYLPOLYSILANES INITIATED BY PHOTO-INDUCED ELECTRON TRANSFER
Authors: Nakadaira Yasuhiro , Komatsu Norio , Sakurai Hideki
Published: July 2006

Irradiation of dodecamethylcyclohexasilane (1) in CCl4–CH2Cl2 in the presence of 9,10-dicyanoanthracene (2) afforded 1,6-dichlorododecamethylhexasilane in 70% yield. Fluorescence of 2 was quenched by 1 with a diffusion-controlled rate. A mechanism of free-radical chlorination involving (1)\overset+· is proposed.
EFFICIENT SYNTHESIS OF SOME 2-OXASPIRO[3.5]NONA-1-ONES AS ANISATIN MODELS
Authors: Kato Michiharu , Kitahara Haruo , Yoshikoshi Akira
Published: July 2006

As a model study for the synthesis of anisatin, 2-oxaspiro[3.5]nonane and 5-hydroxy-5-methyl-2-oxaspiro[3.5]nonane were synthesized from methyl cyclohexanecarboxylate and 2-ethoxycarbonylcyclohexanone, respectively, and these oxetanes were submitted to ruthenium tetroxide oxidation to afford the corresponding β-lactones.
EFFECTS OF ENTRAINERS ON THE EXTRACTION OF TRIGLYCERIDES WITH SUPERCRITICAL CARBON DIOXIDE
Authors: Ikushima Yutaka , Saito Norio , Hatakeda Kiyotaka , Ito Shota , Asano Takashi , Goto Tomio
Published: July 2006

The extraction of triglycerides with supercritical carbon dioxide (SC–CO2) was carried out at pressures of 9.8–27.0 MPa and temperatures of 313 K and 333 K. The addition of ethyl acetate to CO2 was found to produce a supercritical fluid that had an efficiency for the separation of triolein from trioleln–tristearin mixtures.
SYNTHESIS AND PROPERTIES OF 1,4-DIHYDROPYRROLO[3,2-b]PYRROLE-2,5-DIONE DERIVATIVES
Authors: Mukai Toshio , Konno Akinori , Kumagai Tsutomu , Satake Kyosuke
Published: July 2006

A new approach to 1,4-dihydropyrrolo[3,2-b]pyrrole-2,5-dione derivatives, which are regarded to belong to an interesting redox system, is described. Reduction potentials along with chemical and spectral properties of these derivatives are presented, and the capability as electron acceptors is also discussed.
ELECTROCHEMICAL CARBON-SKELETON REARRANGEMENT AS CATALYZED BY HYDROPHOBIC VITAMIN B12 IN NONAQUEOUS MEDIA
Authors: Murakami Yukito , Hisaeda Yoshio , Tashiro Takako , Matsuda Yoshihisa
Published: July 2006

The controlled-potential electrolysis of 2,2-bis(ethoxycarbonyl)-1-bromopropane at −1.50 V vs. SCE as catalyzed by a hydrophobic vitamin B12 in DMF proceeded to give 1,2-bis(ethoxycarbonyl)propane as a major product in the presence of acetic acid under argon atmosphere in the dark.
INCLUSION, SOLUBILIZATION, AND STABILIZATION OF TWO-ELECTRON REDUCED SPECIES OF METHYL VIOLOGEN BY CYCLODEXTRINS
Authors: Matsue Tomokazu , Kato Tetsuya , Akiba Uichi , Osa Tetsuo
Published: July 2006

An electrochemical investigation of methyl viologen-cyclodextrin (CD) system has revealed that β-CD has outstanding ability to include the 2e reduced species of methyl viologen in aqueous solution (formation constant: 1400 dm3 mol−1) in comparison with other CDs and the inclusion solubilizes and stabilizes the electrogenerated species.
FACILE SYNTHESIS OF ACYLGERMANES
Authors: Kiyooka Syun-ichi , Miyauchi Akinori
Published: July 2006

Acylgermanes are prepared from the corresponding esters with triphenylgermyllithium at room temperature in good yields.
ELECTROPHILIC SUBSTITUTION OF STRUCTURALLY RIGID η1-ALLYLPALLADIUM COMPLEXES
Authors: Kurosawa Hideo , Urabe Akira
Published: July 2006

η1-Allyl(aryl)palladium complexes react with some electrophiles to result in the selective Pd-allyl bond cleavage with 1,3-transposition, while the corresponding η3-allyl(aryl)palladiums and the electrophiles give rise to the selective Pd-Ar bond cleavage. The η1-allyl complexes also react with CCl4 and CHCl3 under very mild conditions to give good yields of CH2=CHCHR(CR′Cl2) (R= H, Me; R′= Cl, H).
ESR STUDY OF ALLYLSILANE CATION RADICALS
Authors: Kira Mitsuo , Nakazawa Hiroko , Sakurai Hideki
Published: July 2006

An ESR study of cation radicals of allyltrimethylsilane and derivatives generated by 60Co γ-irradiation in frozen trichlorofluoromethane revealed the large polarization of the SOMO as a consequence of the enhanced σ–π conjugation.
CONVENIENT SYNTHETIC ROUTE TO (±)-FRONTALIN
Authors: Kongkathip Boonsong , Sookkho Rongsan , Kongkathip Ngampong
Published: July 2006

(±)-Frontalin was synthesized in a few steps sequence starting from ethyl acetoacetate involving intramolecular cyclization using palladium chloride as catalyst.
HOMOGENEOUS PERMANGANATE OXIDATION IN NON-AQUEOUS ORGANIC SOLUTION. A KINETIC STUDY ON THE DECOMPOSITION OF THE SPECTROPHOTOMETRICALLY DETECTABLE INTERMEDIATE IN THE OXIDATION OF ENDO-DICYCLOPENTADIENE
Authors: Ogino Toshio , Kazama Tsuyoshi , Kobayashi Tsuyoshi
Published: July 2006

A kinetic study on the decomposition of an organomanganese intermediate detected during the permanganate oxidation of endo-dicyclopentadiene in nonaqueous solution using quaternary ammonium salts revealed that the intermediate exists as ion pairs with quaternary ammonium ions and the stability of the intermediate inversely depends on the size of the cations.
A CONVENIENT METHOD FOR THE PREPARATION OF γ-KETOSULFIDES FROM THIOACETALS
Authors: Ohshima Masahiro , Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

In the presence of trityl tetrafluoroborate, silyl enol ethers react with thioacetals to give the corresponding γ-ketosulfides in good yields with high stereoselectivity. In a similar manner, γ-ketosulfides are obtained in good yields by the one pot reaction directly from ketones and thioacetals via tin(II) enolates.
A FACILE COUPLING REACTION OF VINYL KETONES WITH ALDEHYDES CATALYZED BY RHODIUM(I) HYDRIDE COMPLEX
Authors: Sato Susumu , Matsuda Isamu , Izumi Yusuke
Published: July 2006

A convenient α-hydroxyalkylation of vinyl ketones is accomplished by the coupling reaction of vinyl ketone and aldehyde, where rhodium(I) enolate derived from HRh(PPh3)4 plays an important role in the carbon–carbon bond forming step.
THE SYNTHESES OF IRON CARBONYL COMPLEXES OF 2-SUBSTITUTED TROPONES
Authors: Morita Noboru , Asao Toyonobu , Tajiri Akio , Sotokawa Hideo , Hatano Masahiro
Published: July 2006

2-Substituted tropones reacted with Fe2(CO)9 or with Fe(CO)5 under irradiation to give iron tricarbonyl complexes coordinated at unsubstituted diene moiety. 2-Bromotropone afforded another iron tricarbonyl complex coordinated at substituted diene as a minor product. 2-Methyl-, 2-phenyl-, and 2-tosyloxytropones yielded di-π-allyl type diiron hexacarbonyl complexes. Furthermore, 2-dialkylaminotropones gave diiron hexacarbonyl complexes as a major product containing a new enamine type complex.
SYNTHESIS OF 1,3-DIIMINOISOINDOLINES FROM 2-CYANOBENZALDEHYDE. REACTION OF N-(2-CYANOBENZYLIDENE)ANILINES WITH ELEMENTAL SULFUR IN LIQUID AMMONIA AND AMINES
Authors: Sato Ryu , Nakayama Mikiya , Yuzawa Yoshiki , Goto Takehiko , Saito Minoru
Published: July 2006

Various 1,3-diimonoisoindolines were obtained by treating N-(2-cyanobenzylidene)anilines with elemental sulfur in liquid ammonia and amines. A novel route to isoindoline from 2-cyanobenzaldehyde was developed.
ZEOLITE-CuNaY CATALYZED DECOMPOSITION OF ARYLDIAZOMETHANE
Authors: Onaka Makoto , Kita Hiroshi , Izumi Yusuke
Published: July 2006

Decomposition of aryldiazomethanes is catalyzed by copper ion-exchanged Y-type zeolite to afford cis-1,2-diarylethylenes in high selectivity. The catalytic activity and selectivity are found to be affected by the exchange level of copper ions in zeolite and the solvent used.
ESTIMATION OF EFFECTIVE DIELECTRIC CONSTANTS OF SEVERAL AMPHIPHILIC MEDIA FOR 8-METHOXYPSORALEN
Authors: Sasaki Masako , Sakata Toshibumi , Sukigara Mitsunori
Published: July 2006

The effective dielectric constants of SDS micelle, DMPC liposome and DNA for 8-methoxypsoralen were estimated to be 60,32, and 70 respectively by fluorophotometry.
THE CRYSTAL STRUCTURE OF [BEDT-TTF][Ni(dmit)2]. A NEW ROUTE TO DESIGN OF ORGANIC CONDUCTORS
Authors: Kobayashi Hayao , Kato Reizo , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

In the crystal of the charge transfer complex, [BEDT-TTF][Ni(dmit)2], BEDT-TTF and Ni(dmit)2 molecules are loosely stacked to form mixed-stacking columns. However, the intermolecular transverse interaction indicates that the BEDT-TTF molecules form a side-by-side chain. [BEDT-TTF][Ni(dmit)2] suggests a new route to design of organic metals, despite of its semiconductive behavior.
CONVERSION OF Rh(III) SPECIES ON Rh–Y ZEOLITE DURING EXPOSURE TO CARBON MONOXIDE REVEALED BY TPD TECHNIQUE
Authors: Takahashi Nobuo , Mijin Akihiko , Miyauchi Mitomu , Sato Akira
Published: July 2006

On the exposure of fresh Rh–Y zeolite to CO, the formation of the rhodium species responsible for the TPD peak of CO at 473–500 K, which was followed by the conversion into the second type rhodium species responsible for the peak at 563–583 K, was observed.
ADSORPTION AND DESORPTION OF NITROGEN OXIDE BY IRON(II)-CHELATE RESIN COMPLEXES
Authors: Hirai Hidefumi , Toshima Naoki , Asanuma Hiroyuki
Published: July 2006

Iron(II) ions (14.7 mmol) immobilized on chelate resin (7.53 g) adsorbed 78% of total nitrogen oxide contained in 6 dm3 of nitrogen at the concentration of 1000 ppm at 25 °C. The nitrogen oxide was released rapidly by 83% of that adsorbed by raising the temperature from 25 °C to 80 °C. Adsorption and desorption cycles on this adsorbent could be performed repeatedly without deterioration.
MONOTHIOACETALIZATION OF ACETALS USING DIETHYLALUMINIUM THIOPHENOXIDE
Authors: Masaki Yukio , Serizawa Yuzuru , Kaji Kenji
Published: July 2006

Reactions of diethylaluminium thiophenoxide (Et2AlSPh) with acetals of several types, in which acyclic, cyclic, and bicyclic ones are involved, were examined in comparison with the known reaction using thiophenol in the presence of Lewis acid and found to provide a new and efficient method for preparation of monothioacetals.
PHOTOCYCLOADDITION REACTION OF 3-ARYL-2-ISOXAZOLINES WITH INDENE. GENERATION OF [2+2] CYCLOADDUCT STEREOISOMERS
Authors: Kawamura Yasuhiko , Kumagai Tsutomu , Murai Toshio
Published: July 2006

2-Isoxazolines with electron-withdrawing substituents on the 3-aryl moiety (p-cyanophenyl, p-methoxycarbonylphenyl) gave upon irradiation in indene a mixture of syn and anti cycloadducts regiospecifically toward the C=N double bond via their exciplex intermediate.
CHEMOSELECTIVE OXIDATION OF BENZYLIC ALCOHOLS BY FREMY’S SALT
Authors: Morey Jerónimo , Dzielenziak Adam , Saa José Manuel
Published: July 2006

A promising chemoselective oxidation of benzylic alcohols has been achieved by using Fremy’s salt under phase-transfer conditions. Allylic and saturated alcohols were recovered unchanged.
DIRECT SYNTHESIS OF ETHYLIDENE DIACETATE FROM METHYL ACETATE AND SYNTHESIS GAS BY MIXED RHODIUM–PALLADIUM CATALYST
Authors: Kudo Kiyoshi , Mori Sadayuki , Sugita Nobuyuki
Published: July 2006

The direct hydrocarbonylation of methyl acetate to ethylidene diacetate by use of rhodium–palladium mixed catalysts with iodide and basic promoters in acetic acid solution was investigated at 160 °C under 200 kg/cm2 of synthesis gas(H2/CO=1/1). Conversion of methyl acetate up to 93% and yield to ethylidene diacetate as high as 68% were obtained.
PREPARATION AND STRUCTURE OF THE RUTHENYL COMPLEX, trans-[RuCl(O)(py)4]+
Authors: Yukawa Yasuhiko , Aoyagi Kimitake , Kurihara Mieko , Shirai Kuniko , Shimizu Kunio , Mukaida Masao , Takeuchi Toshio , Kakihana Hidetake
Published: July 2006

trans-[RuCl(O)(py)4]+ with RuIV=O (ruthenyl) unit was obtained by the reaction of trans-[RuCl(NO)(py)4]2+ with NaClO. The remarkably long bond distance of Ru–O (1.862(8) Å), compared with those of known mono-oxo complexes, is indicative of its facile reactivity as an oxygen transfer agent.
RESONANCE RAMAN SPECTRA OF EXCITED TRIPLET-STATES OF β-CAROTENE ISOMERS
Authors: Teraoka Junji , Hashimoto Hideki , Matsudaira Shinji , Koyama Yasushi
Published: July 2006

The resonance Raman spectra of the electronically excited triplet-state of β-carotene, which was produced from the all-trans, 9-cis, 13-cis, and 15-cis isomers by means of flash-photolysis using a sensitizer, were recorded. They were very similar to one another. Isomerization of each isomer under the condition of Raman measurements was followed by HPLC. Isomerization from the cis isomers to the all-trans isomer was predominant. The results suggested that the isomers should have a common configuration in the lowest triplet-state.
SYNTHESIS OF A (±)-3β-TRINORTAXANE DERIVATIVE
Authors: Kojima Tsutomu , Inouye Yoshinobu , Kakisawa Hiroshi
Published: July 2006

Intramolecular photo[2+2]cycloaddition of 4-(3-methyl-2-cyclohexenyl)methoxybicyclo [3.3.1] non-3-en-2-one, followed by oxidation with RuO4, and by alkaline hydrolysis, gave 8-methyltricyclo[9.3.1.03,8] pentadecane-2,10-dione-4-carboxylic acid, a (±)-3β-trinortaxane derivative.
STEREOCHEMICAL FEATURES OF CYCLOADDITION OF HETEROAROMATIC N-YLIDES. SELECTIVE PARTICIPATION OF THE ANTI AND SYN YLIDES
Authors: Tsuge Otohiko , Kanemasa Shuji , Takenaka Shigeori
Published: July 2006

In the cycloaddition of heteroaromatic N-ylides to symmetrically substituted trans olefins, the anti ylide exclusively participates if the ylide is carbonyl-stabilized, while the syn ylide does if it has a substituent of non-carbonyl type. The cycloadducts isomerize into thermodynamically more stable isomers through a retro reaction.
ASYMMETRIC MICHAEL ADDITION OF THIOPHENOL TO MALEIC ACID ESTERS
Authors: Yamashita Hiroyuki , Mukaiyama Teruaki
Published: July 2006

(S)-(−)-Diisopropyl phenylthiosuccinate (81% optical purity) is prepared in 95% yield by the asymmetric Michael addition of thiophenol to diisopropyl maleate in the presence of a catalytic amount of cinchonine. The succinate thus prepared is transformed into (R)-(+)-3,4-epoxy-1-butanol without racemization.
FORMATION OP PERFLUORO(N-ALKYL LACTAMS) BY THE REACTION OF PERFLUORO(N-ALKYL CYCLIC AMINES) WITH FUMING SULFURIC ACID
Authors: Hayashi Eiji , Abe Takashi , Nagase Shunji
Published: July 2006

Perfluoro(N-alkyl lactams) have been obtained in high yields by the reaction of perfluoro(N-alkyl cyclic amines) with fuming sulfuric acid.
NEW PREPARATION METHODS OF CHLOROPHYLL/WATER-SOLUBLE MACROMOLECULAR COMPLEXES
Authors: Inamura Isamu , Ochiai Hideo , Toki Kenzi , Ishine Yuzou , Araki Takeo
Published: July 2006

Three new methods for preparing the chlorophyll/water-soluble macromolecular complexes are described herein. Each method has been found to possess notable characteristic advantages as compared with the former method previously reported by us: (1) operation is very quick and easy, (2) the complexes containing a variety of Chl-a species can be obtained, (3) the Chl-a/polymer ratio can be raised, (4) reproducibility is good, and etc.
STERIC EFFECTS OF CHIRAL LIGANDS IN A NEW TYPE OF ALDOL CONDENSATIONS CATALYZED BY ZINC(II) COMPLEXES OF α-AMINO ACID ESTERS
Authors: Nakagawa Masaji , Nakao Hiroyuki , Watanabe Ken-ichi
Published: July 2006

The aldol condensations of p-nitrobenzaldehyde with acetone have been found to be catalyzed by Zn2+ complexes of α-amino acid esters under mild and neutral conditions to afford enantiomeric excess aldol type product along with some of the dehydrated product. The complexes with ligands containing benzene ring such as esters of Phe, Tyr, and Trp are much more effective both on catalytic activity and asymmetric induction.
MULTIELECTRON REDUCTION OF ALKYLAZIDE BY A (n-Bu4N)3 [Mo2Fe6S8 (SPh)9]-MODIFIED GLASSY CARBON ELECTRODE
Authors: Kuwabata Susumu , Hozumi Yoshiyuki , Tanaka Koji , Tanaka Toshio
Published: July 2006

A multielectron reduction of RN3 (R=CH3, HOC2H4) giving NH3, N2H4, and RNH2 has been succeeded for the first time by the electrochemically reduced species of (n-Bu4N)3[Mo2Fe6S8(SPh)9] not only dissolved in MeOH/THF (1:1 v/v) containing CH3N3 but also modified on a glassy carbon electrode in water containing HOC2H4N3. The turnover number for the formation of NH3 in the latter system reached more than 1×104 in 2 h, based on the Mo–Fe cluster.
ENANTIOSELECTIVE SYNTHESIS OF A NOVEL TYPE OF OPTICALLY ACTIVE OCTAHEDRAL COMPLEXES, trans-[Co(AB)2(X)(Y)]. THE ESSENTIAL ROLE OF AXIAL LIGATION FOR Co–C σ-BOND FORMATION IN THE REACTION OF A Co(I) COMPLEX WITH OLEFINS
Authors: Ohgo Yoshiaki , Takeuchi Seiji
Published: July 2006

C(+)578− and A(−)578-(XCH2CH2)(PPD)2(pyridine)Co [X = CN or COOCH3; PPD = (E,E)-1-phenyl-1,2-propanedione dioxime mono anion] have been synthesized by the enantioselective alkylation of [CoI(PPD)2]− with H2C=CHX in the presence of chiral amines, demonstrating the essential role of axial ligation for Co–C σ-bond formation.
SELECTIVE ADSORPTION OF Ga(III) AND In(III) USING POLYSTYRENE RESINS WITH FUNCTIONAL GROUP HAVING BIS(CARBOXYMETHYL)AMINO MOIETY
Authors: Suzuki Toshishige M , Yokoyama Toshiro , Matsunaga Hideyuki , Kimura Tetsuo
Published: July 2006

Adsorption characteristics of polystyrene resins containing bis (carboxymethyl)amino moiety for group IIIb ions have been studied. The selectivity order toward the present chelating resins is In(III)>Ga(III))>>Al(III) . Selective recovery of Ga(III) and/or In(III) from the acidic solution of Al(III) has been demonstrated by column operation using the present chelating resins.
REACTION OF SPIRO [CYCLOHEXANE-1,3′-3H-INDOLE] WITH GRIGNARD REAGENTS IN THE PRESENCE OF CUPROUS CHLORIDE
Authors: Rodriguez Gonzalo , Benito Yolanda , Temprano Fernando
Published: July 2006

Attack of MeMgl and PhMgBr in toluene on spiro[cyclohexane-1,3′-3H-indole] (1) in the presence of Cu2-Cl2 gives 2′-substituted spiro[cyclohexane-1,3′-indolines] in quantitative yields. Also, attack of PhCH2CH2MgBr on 1 in the presence of Cu2Cl2 afforded 2′-phenethyl, 2′-H and 2′-benzyl (or 2′-p-xylyl) derivatives in toluene (or p-xylene) as solvent.
FREE RADICAL CHAIN OXIDATION OF ERYTHROCYTE GHOST MEMBRANES BY OXYGEN
Authors: Yamamoto Yorihiro , Niki Etsuo , Kamiya Yoshio
Published: July 2006

The oxidation of human and rat erythrocyte ghost membranes has been performed at 37 °C in the presence of radical initiator. It was found that erythrocyte membranes are oxidized by free radical chain mechanism by oxygen with long kinetic chain length of 10 to 100. This is the first clear evidence that shows the radical chain oxidation of biological membranes.
PREPARATION AND ALKYLATION OF CAPPED HYDROPHOBIC VITAMIN B12
Authors: Murakami Yukito , Hisaeda Yoshio , Ohno Teruhisa , Ozaki Toshiaki
Published: July 2006

The pentamethyl cobyrinate complex capped with a fragment involving the imidazolyl moiety was prepared and characterized by spectroscopic means. Its alkylation reactions with alkyl bromides were carried out in organic solvents and compared with those of other hydrophobic vitamin B12’s from the kinetic viewpoint.
DEGRADATION REACTION OF α-d-GALACTOPYRANURONIC ACID IN ACETIC ANHYDRIDE-BASE SYSTEM
Authors: Tajima Kiyohiko
Published: July 2006

α-d-Galactopyranuronic acid was converted to 1,2,3-tri-O-acetyl-4-deoxy-β-l-threo-4-hexenopyranuronic acid (3) and 3-acetoxy-6-(diacetoxymethyl)-2H-pyran-2-one respectively by treatment with acetic anhydride-4-(dimethylamino)pyridine or acetic anhydride-acetic acid-pyridine. Further degradation of 3 in acetic anhydride-triethylamine gave comanic acid.
PHOTOCHEMISTRY OF DI(9-ANTHRYL)DIMETHYLSILANE AND -GERMANE
Authors: Sakurai Hideki , Sakamoto Kenkichi , Nakamura Akihiro , Kira Mitsuo
Published: July 2006

By irradiation, both di(9-anthryl)dimethylsilane and -germane afforded a new type of [4+2] intramolecular addition products that underwent quantitative cycloreversion by thermolysis. The photoproduct from the former was converted to a novel naphthotriptycene derivative.
SPECTROSCOPIC STUDIES ON THE SURFACE STRUCTURES OF RUTHENIUM CATALYSTS DERIVED FROM Ru3(CO)12/γ-Al2O3 OR SiO2
Authors: Asakura Kiyotaka , Yamada Makoto , Iwasawa Yasuhiro , Kuroda Haruo
Published: July 2006

The surface structures of supported Ru catalysts derived from Ru3(CO)12/γ-Al2O3 and Ru3(CO)12/SiO2 during the preparation procedures were studied mainly by EXAFS (Extended X-ray Absorption Fine Structure) analyses and also by IR and UV/VIS Diffuse Reflectance spectroscopies. A direct evidence was found for bonding feature in metal-support interaction, which explains the large difference in surface structures and catalysis of the Ru species supported on γ-Al2O3 and SiO2.
PHOTOELECTROCHEMICAL REDUCTION OF CARBON MONOXIDE ON IRON(H) TETRAPHENYLPORPHYRIN-COATED p-TYPE GaP ELECTRODES
Authors: Yoneyama Hiroshi , Wakamoto Koichi , Hatanaka Nobuyuki , Tamura Hideo
Published: July 2006

Reduction of CO to methanol was achieved with the current efficiency of ca. 10% at p-type GaP photocathodes coated with heat-treated 5,10,15,20-tetraphenylporphyrinatoiron (II).
A FACILE SYNTHESIS OF 6-OXO-PGF1α AND 6-OXO-PGE1
Authors: Nokami Junzo , Ono Toshio , Hiraga Junji , Wakabayashi Shoji
Published: July 2006

6-Oxo-PGF1α and 6-oxo-PGE1 were synthesized from 7-t-butyldimethylsililoxy-6-[(1E)-3-t-butyldimethylsililoxy-1-octenyl]-2-oxabicyclo[3.3.0]octan-2-one (1) and 7-tetrahydropyranyloxy-6-[(1E)-3-tetrahydropyranyloxy-1-octenyl]-2-oxabicyclo[3.3.0]octan-2-one (1’) via C5 unit elongation to the lactone carbonyl of 1 and 1’ respectively. The C5 unit was introduced step by step (C1 + C4) by means of the conversion of 1 and 1’ to the corresponding β-keto esters and then the alkylation of the active methylene of them.
THE PRINS-TYPE REACTIONS OF MONO- AND 1,1-DISUBSTITUTED ALKENES WITH TRICHLOROACETONITRILE IN THE PRESENCE OF BORON TRICHLORIDE
Authors: Hamana Hiroshi , Sugasawa Tsutomu
Published: July 2006

Boron trichloride was found to be a useful Lewis acid for the Prins-type reaction of alkenes with electron-deficient nitriles. In its presence, monosubstituted alkenes react with trichloroacetonitrile, giving dichloroazirine derivatives in high yields. Further exposure of the azirine derivative to boron trichloride at room temperature afforded α,α,γ-trichloroalkylnitrile. The Prins-type acylations of 1,1-disubstituted alkenes with trichloroacetonitrile are also described.
STEREOSELECTIVE SYNTHESIS OF C/D/E RINGS IN STEROIDS CONTAINING E (LACTONE) RING. SYNTHESIS OF (±)-1-(1′-HYDROXYETHYL)-7,7a-DIHYDRO-5(6H)-INDANONE-7a-CARBOXYLIC ACID-7a,1′-LACTONE
Authors: Nakayama Mitsuru , Tanimori Shinji , Hashio Michihisa , Mitani Yoshihiko
Published: July 2006

The title compound, a potential intermediate for the synthesis of steroids containing E (lactone) ring, was synthesized stereoselectively using the acid catalyzed homoconjugate addition of methanol to methyl 6-methyl-2-oxobicyclo[3.1.0]hexane-1-carboxylate in four steps.
C–O BOND CLEAVAGE IN ALLYL PHENYL ETHER INDUCED BY THE PHOTOREACTION OF A HYDRIDOCOBALT COMPLEX
Authors: Oishi Shigero , Kihara Noriko , Hosaka Akeri
Published: July 2006

C–O bond cleavage in allyl phenyl ether giving propylene has been found to proceed via an identical intermediate with that for catalytic double-bond migration giving propenyl phenyl ether by means of laser flash photolysis and product analysis for continuous irradiation.
STEREOCHEMISTRY OF THERMAL [2+2] CYCLOADDITION OF DISILENE WITH ACETYLENE
Authors: Nakadaira Yasuhiro , Sato Ryuji , Sakurai Hideki
Published: July 2006

The reaction of diphenylacetylene with thermally generated cis- and trans-1,2-dimethyl-1,2-diphenyldisilene at 300 °C gave a mixture of the [2+2] cycloadducts in a stereoselective but not completely stereospecific manner. A stepwise radical mechanism is suggested.
CHELATE RESIN-IMMOBILIZED IRON(II) COMPLEXES AS NEW NITROGEN OXIDE ADSORBENTS
Authors: Hirai Hidefumi , Toshima Naoki , Asanuma Hiroyuki
Published: July 2006

Iron(II) ions were immobilized on the chelate resin by treating crosslinked polystyrene beads involving iminodiacetic acid moieties with iron(II) sulfate in water. The resin-immobilized Fe(II) complexes, especially those prepared with fine beads, can adsorb nitrogen oxide rapidly in water from nitrogen atmosphere containing 1000 ppm nitrogen oxide.
A SHORT SYNTHESIS OF 7-OXO-4-THIA-1-AZABICYCLO[3.2.0]HEPTANE. A BASIC SKELETON OF PENICILLIN-TYPE β-LACTAMS
Authors: Chiba Takuo , Sakaki Jun-ichi , Takahashi Takumi , Kaneko Chikara
Published: July 2006

7-Oxo-4-thia-1-azabicyclo[3.2.0]heptane, a basic skeleton of penicillins, was synthesized for the first time from ethyl propiolate in three steps. The key step was the formation of β-lactam ring of thiazolidine-2-acetic acid by the use of Mukaiyama-Ohno’s method.
CATALYTIC OXIDATION OF DIENONES WITH TPPMn(III)Cl-PhIO SYSTEM
Authors: Takata Toshikazu , Tajima Rieko , Ando Wataru
Published: July 2006

Several dienones were oxidized with iodosylbenzene (PhIO) in the presence of catalytic amount of tetraphenylporphinatomanganese(III) chloride (TPPMn(III)Cl), affording corresponding epoxides and pyrons.
ORGANIC TELLURIDE-MEDIATED REACTION OF TOSYL AZIDE WITH CARBONYL COMPOUNDS
Authors: Suzuki Hitomi , Takeda Syoko , Hanazaki Yasuaki
Published: July 2006

Organic telluride induces the reaction of tosyl azide with aldehydes to afford the corresponding N-tosylimines in various yields. Tellurilimine has been suggested as a probable intermediate.
A FACILE SYNTHESIS OF METHYL 4,6-DIDEOXY-3-c-METHYL-4-METHYLAMINO-α-L-MANNOPYRANOSlDE (SIBIROSAMINIDE)
Authors: Yoshimura Juji , Sato Ken-ichi , Singh Rhiddi Bir
Published: July 2006

The title branched-chain sugar obtained by methanolysis of sibiromycin was easily synthesized from L-rhamnose through eight-step conversions.
IN-SITU DETERMINATION OF CHLORIDE IONS IN FRESH CONCRETE BY VOLTAMMETRIC SENSORS
Authors: Yamada Akifumi , Hodouchi Kazunori , Otsuga Nozomu , Ueda Kazuyoshi , Hashida Choichi
Published: July 2006

The voltammetric sensor was applied to the analysis of chloride content in sea sand and fresh concrete samples. The oxidation and reduction currents at the silver electrode were monitored as a function of the time. Chloride recovery was found to be good from fresh concrete.
DIRECT DETERMINATION OF CATION DISORDER IN MgAl2O4 SPINEL BY HIGH-RESOLUTION 27Al MAGIC-ANGLE-SPINNING NMR SPECTROSCOPY
Authors: Gobbi G C , Christoffersen R , Otten M T , Miner B , Buseck P R , Kennedy G J , Fyfe C A
Published: July 2006

27Al MAS NMR is shown to be a valuable tool in probing the coordination of aluminum in MgAl2O4 spinels, enabling the extent of Mg/Al order in the structure to be determined directly. From the relative intensities of the NMR peaks, assigned to octahedrally and tetrahedrally coordinated aluminum, the inversion parameter, i, was calculated to be 0.36±0.03 for a MgAl2O4 spinel synthesized at 1400 °C, and 0.12±0.06 for a natural spinel.
ZEOLITE-CATALYZED RING-OPENING OF EPOXIDES WITH AMINES
Authors: Onaka Makoto , Kawai Motomitsu , Izumi Yusuke
Published: July 2006

The ring-opening of unsymmetrical epoxides with amines has been investigated using zeolite as a catalyst. Moderately acidic and basic zeolite shows higher catalytic activity and regioselectivity compared to strongly acidic or basic zeolite. The cooperative function of acid and base sites of zeolite was found to be essential for effective catalysis.
STUDIES ON ALKALINE EARTH SULFITES. VII. HYDROGEN BONDING AND THE LOCATION OF HYDROGEN ATOMS IN THE CRYSTAL STRUCTURE OF CaSO3·4H2O AND Ca3(SO3)2SO4·12H2O
Authors: Zangen Mendel , Cohen Abraham
Published: July 2006

The location of the hydrogen atoms in the crystal structure of CaSO3·4H2O and Ca3(SO3)2SO4·12H2O was calculated using structural considerations. The results were confirmed by the agreement in the intensities of the X-ray powder diffraction lines between the calculated and the measured patterns. The orientation of the water molecules is such as to allow maximal hydrogen bonding of all oxygens belonging to SO32− or SO42− groups. Also, the coordination of the caatoms is shown to be eight and not six as previously reported.
CHEMILUMINESCENCE METHOD FOR SELECTIVE DETERMINATION OF IRON(II) AND CHROMIUM(III) WITH SINGLE REACTION SYSTEM
Authors: Yamada Masaaki , Sudo Atsuko , Suzuki Shigetaka
Published: July 2006

A new chemiluminescence system, brilliant sulfoflavine-hydrogen peroxide-sodium hydroxide-acetonitrile, is described for continuous flow analysis for Fe(II) and Cr(III). This permits highly selective determination with detection limits of 1×10−9M for Fe(II) and 3×10−8M for Cr(III).
X-RAY STRUCTURAL ANALYSIS OF MOLTEN LiF–KF EQUIMOLAR MIXTURE
Authors: Igarashi Kazuo , Murofushi Mitsuhisa , Iwadate Yasuhiko , Mochinaga Junichi , Ohno Hideo
Published: July 2006

The structure of molten LiF–KF equimolar mixture at 545 °C was studied by X-ray diffraction analysis. From the analysis of RDF, the nearest neighbour distance and coordination number of Li+–F− pair in the mixture were found to be 1.85 Å and 3.0, respectively.
COUPLING REACTION BETWEEN METHYLPROPIONATE AND METHANOL TO FORM METHYLMETHACRYLATE OVER METAL ION-CONTAINED MAGNESIUM OXIDE CATALYSTS
Authors: Ueda Wataru , Kurokawa Hideki , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Solid-base catalyst, MgO modified by metal ion promoted the cross-coupling reaction between methylpropionate and methanol to give methylmethacrylate. 65% selectivity to methylmethacrylate was attained by using 16.7 wt% Mn–MgO catalyst at 400 °C.
SELECTIVE HYPERFILTRATION OF HEAVY METAL IONS. ION-ASSOCIATION SORPTION AND PERMEATION OF METAL COMPLEXES ON CELLULOSE ACETATE MEMBRANES
Authors: Hayashita Takashi , Hamada Motohiro , Takagi Makoto
Published: July 2006

Various metal thiocyanate complexes in aqueous solution were found to be efficiently sorbed on cellulose acetate (CA) polymers. On the basis of this behavior, a new hyperfiltration process–a selective sorption to the membrane and a solvent flow-coupled permeation of metal complex species–was proposed for the separation of heavy metal ions in solution.
PHASE TRANSITION-LIKE PHENOMENON OBSERVED FOR “PSEUDO-LIQUID PHASE” OF HETEROPOLY ACID CATALYSTS
Authors: Takahashi Kazuteru , Okuhara Toshio , Misono Makoto
Published: July 2006

We found for dehydration of 2-propanol over H3pw12O40 at 80–100 °C that there were at least two pseudo-liquid phases which differed in the amount of alcohol absorbed and the catalytic activity. The transition between the two phases proceeded nearly reversibly depending on the temperature and pressure.
ELECTRODIALYSIS WITH LIQUID MEMBRANE CONTAINING DIBENZO-18-CROWN-6 AS A CARRIER
Authors: Igawa Manabu , Saitou Kiyohiko , Kasai Hiroki , Tanaka Masao , Yamabe Takeo
Published: July 2006

A liquid membrane containing dibenzo-18-crown-6 was applied to electrodialysis and was found to be effective for selective transport of potassium ions. The selective cation transport was caused by the carrier relay mechanism and the current density increased with increasing crown ether concentration and increasing applied voltage.
A NOVEL TRANSFORMATION OF CHLOROPHYLL a AGGREGATES IN POLY(VINYL ACETATE) FILMS By IMMERSING INTO WATER. OBSERVATION OF POSITIVE OR NEGATIVE PHOTO-INDUCED POTENTIAL SHIFTS FOR THE RESULTED FILMS COATED ON PLATINUM ELECTRODE
Authors: Uehara Kaku , Shibata Keisuke , Tanaka Makoto
Published: July 2006

Upon immersing into water, the chlorophyll a(chl a)/poly vinyl acetate) film cast from dioxane or dimethyl sulfoxide (DMSO) showed a transformation from chl a-dioxane aggregate (692 nm) to monomeric(668 nm) or from chl a-DMSO aggregate (695 nm) to (chl a·2H2O)n(746 nm), respectively. The platinum electrodes coated By the two types of transformed films showed the opposite direction of photo-induced potential shift.
CONVENIENT SYNTHESIS OF 1-AZA-3-THIABICYCLO[3.1.0]HEXANES FROM l-CYSTEINE
Authors: Takata Toshikazu , Kuo Mingjung , Tamura Yoshiharu , Kabe Yoshio , Ando Wataru
Published: July 2006

Synthesis of optically active 2-substituted and unsubstituted 1-aza-3-thiabicyclo[3,1.0]hexanes are accomplished By intramolecular cyclization of 4-hydroxymethylthiazolidines which are prepared By the reaction of l-cysteine methyl ester with appropriate aldehydes followed By reduction of ester function.
ESR STUDIES ON A NEW 3dz2 TYPE COPPER(II)-CROWN ETHER COMPLEX WITH AXIALLY COORDINATED WATER MOLECULES
Authors: Li Yong , Tomoda Hideyuki , Tajima Kunihiko , Ishizu Kazuhiko , Azuma Nagao
Published: July 2006

In the presence of the optimum amount of water, the ESR spectra of copper(II) complexes of 5-oxygen donors observed in BF3-etherate solution revealed a typical g-anisotropy ascribed to the 3dz2 type copper(II) complex. Based on the detection of superhyperfine splittings due to 17O isotope, the axial ligation of water molecule was confirmed, and the coordination geometry of the complex was assumed.
SKELETAL REARRANGEMENTS OF TRICYCLO[6.3.0.01,6]UNDECAN-5-OLS TO FUNCTIONALIZED TRICYCLO[6.3.0.01,5]- and [5.3.1.01,5]UNDECANES
Authors: Kakiuchi Kiyomi , Kumanoya Shuichi , Ue Masaki , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

The functionalized tricyclo[6.3.0.01,5]- and [5.3.1.01,5]-undecanes are newly synthesized from endo- and exo-tricyclo-[6.3.0.01,6]undecan-5-ols by skeletal rearrangements using the solvolyses of their tosylates. Furthermore, a novel biologically active compound is derived readily from the rearrangement products.
STELEOSELECTIVE REDUCTION OF RACEMIC N-HYDROXYAMINO ACIDS BY OPTICALLY ACTIVE THIOLS-IRON(II)
Authors: Nambu Yoko , Endo Takeshi
Published: July 2006

Kinetic resolution of racemic N-hydroxyamino acids by the reduction with optically active thiols and a catalytic amount of ferrous ion gave optically active amino acids presumably through enantiodifferentiating coordination of substrates to thiol-Fe(II) complexes.
AN EFFECTIVE ACTIVATION OF ALLYL METHYL ETHERS BY A CATALYTIC AMOUNT OF TRITYL PERCHLORATE IN THE ALLYLATION OF SILYL ENOL ETHERS
Authors: Mukaiyama Teruaki , Nagaoka Hitoshi , Ohshima Masahiro , Murakami Masahiro
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl methyl ethers smoothly react with silyl enol ethers to afford the corresponding γ,δ-unsaturated carbonyl compounds in good yields. By the combination of this reaction with the trityl perchlorate catalyzed allylation of acetals γ,δ-unsaturated ketones are synthesized from α,β-unsaturated acetals by a one-pot procedure.
A CONVENIENT METHOD OF STEREOCHEMICAL ANALYSIS OF PRENYLTRANSFERASE REACTION AND ITS APPLICATION
Authors: Ito Michio , Koyama Tanetoshi , Ogura Kyozo
Published: July 2006

convenient method based on the utilization of isopentenyl pyrophosphate (IPP) isomerase was developed to facilitate the discrimination of the prochirality of the hydrogen eliminated from IPP during prenyltransferase reaction. E,E-Farnesyl pyrophosphate synthetase of pumpkin was shown to catalyze the addition of allylic moiety to the si face of the double bond of IPP with loss of the 2-pro-R hydrogen.
OBSERVATION OF A SILANIMINE IN AN INERT MATRIX AND IN SOLUTION AT LOW TEMPERATURE
Authors: Zigler Steven S , West Robert , Michl Josef
Published: July 2006

Irradiation of Mes3SiN3 in 3-methylpentane at 77 K or −140 °C yields the silanimine, Mes2Si=NMes. The silanimine is yellow (λmax=296, 444 nm) and decomposes at temperatures above ca. −120 °C.
MATRIX ISOLATION OF A SILICON–NITROGEN DOUBLE BONDED SILAIMINE
Authors: Sekiguchi Akira , Ando Wataru , Honda Koichi
Published: July 2006

A silicon–nitrogen double-bonded silaimine was isolated in the matrix at low temperature by the photolysis of (dimesityl)(trimethylsilyl)silylazide. The silaimine has an intense orange color, and shows electronic absorption bands at 272 and 474 nm assigned to π-π* and n-π* transitions respectively.
A NEW AND EFFECTIVE AMINOMETHYLATION BY THE USE OF N-(p-TOLUENESULFONYLMETHYL)-p-TOLUENESULFONAMIDE AS AN EQUIVALENT OF METHANIMINE. A CONVENIENT PREPARATION OF PYRROLE COMPOUNDS
Authors: Kinoshita Hideki , Inomata Katsuhiko , Hayashi Masatoshi , Kondoh Takeshi , Kotake Hiroshi
Published: July 2006

Readily available N-(p-toluenesulfonylmethyl)-p-toluenesulfonamide was treated with base to generate N-methylene-p-toluenesulfonamide which reacted with a variety of nucleophiles forming the corresponding N-tosyl-aminomethylated compounds in good yields. Furthermore, the N-tosyl-aminomethylated acetals thus obtained were converted into the corresponding N-tosylpyrroles with the aid of acid catalyst in excellent yields.
STABILIZATION AND FACILITATED DEPOSITION OF SURFACE MONOLAYERS OF FLUOROCRBON AMPHIPHILES THROUGH POLYION COMPLEX FORMATION
Authors: Higashi Nobuyuki , Kunitake Toyoki
Published: July 2006

Bilayer-forming ammonium amphiphiles with one, two, or three fluorocarbon chains formed surface monolayers on water, which were stabilized by polyions in the subphase and deposited on polycarbonate films as polyion complexes by the Langmuir–Blodgett technique.
Inverse Klemer–Rodemeyer Fragmentation. Application to the Synthesis of Positional Isomers of Ristosamine and Acosamine
Authors: Morin Christophe
Published: July 2006

Application of the Klemer–Rodemeyer fragmentation to a 4-O-silicon substituted rhamnose benzylidene acetal leads to “inverse opening” of the dioxolane ring, thus opening a new route to 2-amino-2,3,6-trideoxy-l-hexoses.
Catalytic Action of Metal Salts in the Amination of 5,8-Quinolinediones
Authors: Yoshida Katsuhira , Yamamoto Mayumi , Ishiguro Miwa
Published: July 2006

The catalytic effects of some metal ions on the amination of 5,8-quinolinedione have been investigated. The reactions were specifically promoted by nickel(II) ion, and 6-aminated products were exclusively obtained. The metal chelate complex was proposed as an activated intermediate.
Synthesis of N-Arylhydroxylamines by Tellurium-Catalyzed Reduction of Aromatic Nitro Compounds
Authors: Uchida Shuji , Yanada Kazuo , Yamaguchi Hiromi , Meguri Haruo
Published: July 2006

p-Substituted nitrobenzenes were readily reduced with sodium borohydride and a catalytic amount of tellurium to give the corresponding hydroxylamines in good yields.
ELECTROPHILIC REACTION OF ALLYL ACETATES WITH ELECTROGENERATED CARBANIONS IN THE PRESENCE OF Pd(0)-CATALYST
Authors: Minato Makoto , Nonaka Tsutomu , Fuchigami Toshio
Published: July 2006

Counter cation effect on the Pd(0)-catalyzed electrophilic reaction of allyl acetates with carbanions was studied by using the electrogenerated carbanions having various kinds of counter cations.
Photoreaction of 1,6-Disubstituted-1,3,5-hexatriynes with 2,3-Dimethyl-2-butene
Authors: Shim Sang Chul , Lee Tae Suk
Published: July 2006

Irradiation of 1-phenyl-6-methyl- and 1,6-diphenyl-1,3,5-hexatriynes with N2 purged 2,3-dimethyl-2-butene yields 1:2 photoadducts, 1-(1′-phenylethynyl-2′,2′,3′,3′-tetramethylcyclopropyl)-2-(1″,2″,2″,3″,3″”-pentamethylcyclopropyl)acetylene and 1-(1′-phenylethynyl-2′,2′,3′,3′-tetramethylcyclopropyl)-2-(1″-phenyl-2″,2″,3″,3″-tetramethylcyclopropyl)acetylene, respectively. The photoaddition reactions seem to proceed from the triplet excited states.
A NEW TRANSFORMATION OF ALDOSE DERIVED SYNTHONS TO PSEUDO-HEXOPYRANOSE OR PSEUDO-PENTOFURANOSE DERIVATIVES
Authors: Tadano Kin-ichi , Maeda Hiroo , Hoshino Masahide , Iimura Youichi , Suami Tetsuo
Published: July 2006

The d-ribose or d-erythrose derived acyclic synthon, which possesses a 2-malonyl carbon chain at C-1 position, was cyclized stereoselectively to a six- or five-membered carbocycle. Those carbocycles were converted into pseudo-β-l-mannopyranose derivatives or pseudo-β-l-arabinofuranose derivatives efficeintly.
A Regio- and Stereoselective Michael Addition of Amide Dienolates to α,β-Unsaturated Esters
Authors: Yamaguchi Masahiko , Hamada Michiyuki , Kawasaki Shinji , Minami Toru
Published: July 2006

β-Alkyl-α-vinylglutaramides with threo- or erythro-configuration were synthesized stereoselectively by the Michael addition of amide dienolates to α,β-unsaturated esters.
ALKYLATION OF CHLOROBENZENE WITH CH3OH OVER H-MORDENITE TREATED WITH CHLOROFLUOROBENZENE
Authors: Horie Osamu , Okazaki Susumu
Published: July 2006

The vapor phase alkylation of chlorobenzene was promoted by H-mordenite treated with chlorofluoromethane. Ortho alkylation was preferentially promoted in the catalytic reaction after process times of 1 h.
INCLUSION COMPLEXES OF 1,1,2,2-TETRAPHENYLETHANE-1,2-DIOL AND 1,1,2,2-TETRAPHENYLETHANE
Authors: Toda Fumio , Tanaka Koichi , Wang Yu , Lee Gene-Hsiang
Published: July 2006

The title compounds were found to be good host molecule for various organic guests. In the crystal structures of the 2:1 p-xylene inclusion complexes of the title host molecules, each p-xylene molecule is surrounded by four phenyl groups of the two neighboring host molecules. Application of such inclusion phenomena to the separation of isomers was also reported.
Crystal Structure of the Tetramethylammonium Salt of trans-Dinitrobis(dimethylglyoximato)cobalt(III), [N(CH3)4][Co(C4H7N2O2)2(NO2)2]
Authors: Yoshida Noboru , Fujimoto Masatoshi , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

Crystal structure of the tetramethylammonium salt of trans-dinitrobis(dimethylglyoximato)cobalt(III), NMe4[Co(dmgH)2(NO2)2], is reported. The results of X-ray diffraction analysis reveal that the difference in the stretching frequency mode between IR spectrum of NMe4[Co(dmgH)2(NO2)2] and that of Na[Co(dmgH)2(NO2)2]·2H2O results from the difference in the coordination mode of the equatorial ligand dmgH and in the orientation of axial NO2− and Co–N(NO2) distance.
Preparation of New Phthalocyanine Complexes of Yttrium(III) and Some Lanthanoid(III) Ions
Authors: Kasuga Kuninobu , Ando Munenori , Morimoto Hideharu , Isa Mikio
Published: July 2006

Phthalocyanine complexes of yttrium(III) and lanthanoid(III) ions, Pc3Ln2 (Pc = phthalocyanine anion, Ln = lanthanoid(III) cation) were prepared and characterized. A Q band undergoes a blue shift with a decrease in ionic radius of the lanthanoid(III) ions, while an X band undergoes a red shift.
STABILIZATION OF MONOOXOMOLYBDENUM(V) COMPLEXES [MoO(SR)4]1− USING PEPTIDE THIOLATO AND BULKY AROMATIC THIOLATO LIGANDS
Authors: Ueyama Norikazu , Zaima Hiroaki , Nakamura Akira
Published: July 2006

Mononuclear monooxomolybdenum(V) peptide complexes having hydrophobic amino acid residues adjacent to Cys residue, [MoO(Z-cys-Val-OMe)4]1− and [MoO(Z-cys-Pro-Leu-cys-OMe)2]1−, exhibit large A|| values (54.2×10−4 cm−1 and 56.6×10−4 cm−1, respectively) in the EPR spectra. Other monooxomolybdenum(V) complexes having bulky thiolato ligands, [NEt4][MoO(tmbt)4] (tmbt = 2,4,6-trimethylbenzenethiolato) and [NEt4][MoO(tipbt)4] (tipbt = 2,4,6-triisopropylbenzenethiolato), have been prepared. These have a covalent Mo=O bond as evidenced by the EPR (large A|| of 57.6×10−4 cm−1), and high v(Mo–O) (944 cm−1) from Raman spectroscopy on the latter complex). Electrochemical reduction of these complexes results in removal of the oxo ligand.
CATHODIC POLYMERIZATION OF VALINE N-CARBOXY ANHYDRIDES(NCA’S)
Authors: Komori Tetsuo , Nonaka Tsutomu , Fuchigami Toshio
Published: July 2006

Valine N-carboxy anhydrides(NCA’s) were very smoothly polymerized with electrogenerated bases(EGB) to give the polyvalines in high yields.
A Monoclinic Modification of an Ion Radical Salt, (HMTTeF)4(PF6)2, and Its Solid State Properties
Authors: Li Zhu Shi , Matsuzaki Susumu , Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Sano Mizuka
Published: July 2006

A unit cell contains four formula units. In each formula unit, three hexamethylenetetratellurafulvalene (HMTTeF) molecules are stacked to form a triad over which two electrons are delocalized and the remaining one of neutral nature is positioned between the triads. The crystal has an electrical conductivity of 23 S cm−1 at 293 K with an activation energy of 0.023 eV.
Asymmetric Reduction of Chiral Acetophenone Oxime Ethers to Optically Active Primary Amines
Authors: Itsuno Shinichi , Tanaka Kazuo , Ito Koichi
Published: July 2006

Chiral oxime ethers were synthesized from Na salt of acetophenone oxime and chiral halides, tosylates, or N-tosylaziridines which were derived from β-pinene or α-amino acids. Asymmetric reduction of the chiral oxime ether with LiAlH4 or BH3·THF gave the optically active primary amine.
Enzymatic Resolution of N-Acetyl p-Nitrophenylserinates
Authors: Chênevert Robert , Létourneau Martin
Published: July 2006

Asymmetric hydrolysis of alkyl (methyl and ethyl) (±)-erythro-p-nitrophenylserinates by α-chymotrypsin afforded optically active esters in optical purities above 95%, but alkyl (±)-threo-p-nitrophenylserinates were not hydrolyzed.
FLUORESCENCE QUENCHING STUDY OF EuII-CROWN ETHER COMPLEXES BY 5-SUBSTITUTED-1,3-DIMETHYLURACILS
Authors: Ishida Akito , Toki Susumu , Takamuku Setsuo
Published: July 2006

Fluorescence of EuII-crown ether complexes was quenched by 5-substituted-1,3-dimethyluracils. The quenching rate constant increased with increasing the electron-withdrawing properties of the substituents which supports the electron-transfer mechanism proposed for the EuIII/EuII photoredox system. A cavity size of the crown ether also influenced the quenching process.
Reaction of 1,2-Epoxyalkylsilanes with Azides. Stereoselective Synthesis of 1-Azide-2-hydroxyalkylsilanes as a Synthetic Equivalent of 1-Aminoalkene
Authors: Tomoda Shuji , Matsumoto Yuzo , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

The reaction of 1,2-epoxyalkylsilanes with azidotrimethylsilane or sodium azide provided 1-azido-2-hydroxyalkylsilanes stereoselectively, one of which was successfully converted into a 2-aza-1,3-diene by a three-step reaction sequence.
Synthesis and Luminescence Properties of Di- and Tri-methylene Linked Tris(2,2′-bipyridine)ruthenium(II) Complex Dimers. Ground-Excited State Interaction
Authors: Furue Masaoki , Kuroda Noritaka , Nozakura Shun-ichi
Published: July 2006

Di- and tri-methylene-linked Ru(bpy)32+ complexes 2 were synthesized. The luminescence properties of 2 were compared with those of its component monomer. In the excited 2 systems, the intramolecular interaction leading to the enhanced quenching or the formation of a new triplet excimer was not observed.
Optical Resolution of β-Blockers by HPLC on Cellulose Triphenylcarbamate Derivatives
Authors: Okamoto Yoshio , Kawashima Mitsunobu , Aburatani Ryo , Hatada Koichi , Nishiyama Toshimi , Masuda Motokazu
Published: July 2006

Optical resolution of five β-adrenergic blocking agents (β-blockers) alprenolol, oxyprenolol, propranolol, pindolol, and atenolol was examined by HPLC on 13 chiral stationary phases composing of cellulose triphenylcarbamate derivatives. All β-blockers were completely resolved on a cellulose tris(3,5-dimethylphenylcarbamate) column.
Structure and Absolute Configuration of Isodictytriol, a New Diterpene from the Brown Alga Dictyota dichotoma
Authors: Kusumi Takenori , Nkongolo Dave Muanza , Ishitsuka Midori , Inouye Yoshinobu , Kakisawa Hiroshi
Published: July 2006

A new diterpene, isodictytriol, was isolated from the brown alga, Dictyota dichotoma, and its structure and absolute configuration were elucidated by means of spectral analyses and chemical transformations.
Generation and C-Ethoxythiocarbonylation of Enolates Using Ultrasound
Authors: Palominos Mario A , Rodriguez Robinson , Vega Juan C
Published: July 2006

O-Ethyl 3-oxothionoesters were obtained in good yields by reaction of O,O-diethyl trithiodicarbonate with enolate from ketones and NaH in tetrahydrofuran. The enolate formation and thioacylation were performed under ultrasonic irradiation.