bluuebunny/crossref_metadata_2025 huggingface dataset:
EFFECTS OF EXPANSION OF THE π-ELECTRON SYSTEM ON PHOTOCURRENT QUANTUM YIELDS FOR PORPHYRIN PHOTOCELLS: MAGNESIUM AND ZINC TETRABENZPORPHYRIN SENSITIZERS
Authors: Yamashita Kazuo
Published: July 2006

Expansion of the porphyrin π-system by peripheral substitution lowers the oxidation potential of the macrocycle and increases the photocurrent quantum yield obtained when the porphyrin is used as sensitizer in a photocell. Tetrabenzporphyrins fall among the most efficient porphyrin sensitizers studied so far with photocurrent quantum yields greater than 10% in the Al/Porphyrin/0.1 mol dm−3 K3[Fe(CN)6] and 0.1 mol dm−3 K4[Fe(CN)6]/Pt cell.
ACTIVATED NITRILES IN HETEROCYCLIC SYNTHESIS: A NOVEL SYNTHESIS OF 4-AZOLOYL-2-AMINOQUINOLINES
Authors: Abdel-Galil Fathy M , Riad Bahia Y , Sherif Sherif M , Elnagdi Mohamed H
Published: July 2006

A novel synthesis of 4-azoloyl-2-aminoquinolines via the reaction of the 3-cyanomethylene derivatives of isatin with the 2-pyrazolin-5-one derivatives and 2-ethoxycarbonylmethyl-2-thiazolin-4-one is reported.
SYNTHESIS OF (±)-VITRENAL
Authors: Magari Hideaki , Hirota Hiroshi , Takahashi Takeyoshi , Matsuo Akihiko , Uto Seiryû , Nozaki Hiroshi , Nakayama Mitsuru , Hayashi Shûichi
Published: July 2006

(±)-Vitrenal (1), a sesquiterpene aldehyde with a novel vitrane skeleton, was synthesized from a monoterpene piperitenone (2) by 12-step reactions in ca. 7% overall yield. 2-Formyl-isocarane, derived from 2 via (±)-isocaran-2-one was allylated stereospecifically and, after protection of the formyl group, the allyl chain was modified to a 4-methoxy-3-butenyl group. Acid treatment of the masked dialdehydic intermediate yielded 1 by concomitant deprotection and aldol condensation.
FACILE AND HIGHLY SELECTIVE SYNTHESIS OF 2,2-DIALKYL-1,5-LACTONES BY THE CALBOXYLATION OF PRIMARY, TERTIARY-1,4-DIOLS WITH FORMIC ACID OR COPPER(I)CARBONYLS IN THE PRESENCE OF CONCENTRATED SULFURIC ACID
Authors: Takahashi Yukio , Yoneda Norihiko , Nagai Hiroshi
Published: July 2006

The carboxylation of primary, tertiary-1,4-diols with 100% formic acid or copper(I)carbonyls and carbon monoxide in the presence of 97∼100% H2SO4 at room temperature and under atmospheric pressure gave 2,2-dialkyl substituted 1,5-lactones in high yields.
EVIDENCES FOR THE PHENYL-TRIPHENYLMETHYL RADICAL PAIR IN THE THERMOLYSIS OF PHENYLAZOTRIPHENYLMETHANES
Authors: Suehiro Tadashi , Nakausa Ryuichi , Masuda Seiichi , Kobayasht Michio , Date Munehiro
Published: July 2006

Analyses of the emission signals in the CIDNP of phenylazotriphenylmethanes (PAT), of the e.s.r. spectra of phenyldiazenyl radicals, and of the calculated hfs constants of phenyl and phenyldiazenyl radicals, suppor the radical pair ‾Ph· ·CPh3 which determines the polarization of the phenyl group in the products derived from phenylazotriphenylmethanes.
FORMATION OF 1,1-DITHIODICARBOXYLIC ACID ESTERS FROM CYCLIC KETONES, CARBON DISULFIDE, AND LITHIUM METHOXIDE
Authors: Fujinami Tatsuo , Wakuda Kazuo , Takahashi Noriyuki , Sakai Shizuyoshi
Published: July 2006

Methyl esters of 1,1-dithiodicarboxylic acids were formed by the reaction of cyclic ketones with lithium methoxide and carbon disulfide in tetrahydrofuran followed by the treatment with methyl iodide. The reaction proceeds via dithiocarboxylation and carbonyl carbon-carbon bond cleavage through an inverse Dieckmann-type reaction.
INSERTION OF OXYGEN ATOM IN STEROID FRAMEWORKS–A NEW METHOD OF TRANSFORMATION OF HYDROXYSTEROID INTO OXASTEROID
Authors: Suginome Hiroshi , Yamada Shinji
Published: July 2006

A two-step transformation of saturated hydroxysteroids into oxasteroids is described; the reaction involves photo-reaction of the hypoiodites of the hydroxysteroids generated with mercury(II) oxide and iodine to give isomeric formyl esters [e.g., 2 and 3], which are cyclized to oxasteroids [e.g.,4 and 5] with sodium borohydride.
SILICA GEL-ASSISTED TWO-PHASE AZO-COUPLING REACTIONS
Authors: Tamagaki Seizo , Suzuki Kenji , Tagaki Waichiro
Published: July 2006

Commercially available wet silica gel facilitated the solid–liquid two-phase reactions of p-nitrobenzenediazonium tetrafluoroborate with aromatic amines to afford the corresponding azo-products in excellent yields. The silica gel could be recovered for reuse. The dependence of the yields on amounts of water impregnated on silica gel was discussed.
A NEW METHOD TO CONTROL NICKEL METAL PARTICLE SIZE IN Ni/SiO2 CATALYST
Authors: Suzuki Hideo , Takasaki Seiji , Koga Fumio , Ueno Akifumi , Kotera Yoshihide , Sato Toshio , Todo Naoyuki
Published: July 2006

Techniques to control metal particle size in a supported catalyst, where metal particles may be fixed on a support by forming chemical bonds with oxygen atoms in a support, were investigated. The effect of metal particle size on a reaction selectivity was elucidated in terms of the ratio of numbers of the edge and corner atoms to those of the surface total atoms in the metal crystallites.
SELECTIVE SYNTHESIS OF LIGHT OLEFINS FROM DIMETHYL ETHER OVER ACIDIC SALTS OF H3PW12O40 WITH 1,3,5-TRIAZINE
Authors: Hibi Takuo , Okuhara Toshio , Misono Makoto , Yoneda Yukio
Published: July 2006

Formation of acidic salts of H3PW12O40 with 1,3,5-triazine suppressed effectively hydrogen transfer step, producing olefin-rich hydrocarbons in the conversion of dimethyl ether without losing the catalytic activity.
THE X-RAY STRUCTURE OF A MAGNESIUM-1,3-DIENE COMPLEX. THE UNIQUE MODE OF COORDINATION OF DIENE OBSERVED IN PENTA-COORDINATED Mg(THF)3 (s-cis-PhCH=CH–CH=CHPh)
Authors: Kai Yasushi , Kanehisa Nobuko , Miki Kunio , Kasai Nobutami , Mashima Kazushi , Yasuda Hajime , Nakamura Akira
Published: July 2006

X-ray analysis Mg(THF)3(s-cis-PhCH=CH–CH=CHPh) revealed a novel magnesium-1,3-diene structure with trigonal bipyramidal coordination.
SYNTHESIS OF METHYL 1,5- AND 1,7-AZULENEQUINONE-3-CARBOXYLATES
Authors: Morita Tadayoshi , Ise Fumiaki , Takase Kahei
Published: July 2006

Methyl 1,5- and 1,7-azulenequinone-3-carboxylates were synthesized by oxidation of methyl 3-acetoxy-7-methoxy- and 3-acetoxy-5-methoxyazulene-1-carboxylates with ceric ammonium nitrate, respectively.
NEW SYNTHESIS OF β-KETO ACETALS
Authors: Takazawa Osamu , Mukaiyama Teruaki
Published: July 2006

Enamines derived from ketones or aldehydes react smoothly with trialkyl orthoformates in the presence of Lewis acids to give β-keto acetals in good yields.
AUTORECYCLING OXIDATION OF AMINES TO CARBONYL COMPOUNDS CATALYZED BY 3,4-DISUBSTITUTED 4-DEAZATOXOFLAVIN DERIVATIVES
Authors: Nagamatsu Tomohisa , Hashiguchi Yuko , Sakuma Yoshiharu , Yoneda Fumio
Published: July 2006

3,4-Disubstituted 4-deazatoxoflavin derivatives (II) were prepared by the condensation of 6-(1-methylhydrazino)uracils (I) with appropriate α-diketones. The compounds II oxidized long-chain alkylamines such as n-octylamine and n-dodecylamine besides benzylamine and cyclohexylamine to yield the corresponding carbonyl compounds via imines, catalytically with a markedly high turnover number.
29-NORSENGOSTERONE AND 29-NORCYASTERONE, NEW C-28 PHYTOECDYSTEROIDS FROM AJUGA REPTANS (LABIATAE)
Authors: Camps Francisco , Coll José , Cortel Adolfo
Published: July 2006

Ajugalactone (1), cyasterone (3), polypodine B (5), β-ecdysone (6) and two new C-28 phytoecdysteroids, 29-norsengosterone (2) and 29-norcyasterone (4), have been isolated from Ajuga reptans and characterized by spectral means and X-ray diffraction analysis of 2,3,20,22-diacetonide of 4.
THE NQR AND STRUCTURE OF HEXABROMOANTIMONATE(III) AND BISMUTHATE(III) IONS
Authors: Okuda Tsutomu , Hiura Morio , Koshimizu Etsuo , Ishihara Hideta , Kushi Yoshihiko , Negita Hisao
Published: July 2006

79Br NQR spectra were observed in (R2NH2)3MBr6 (R=C2H5, n-C3H7;M=Sb, Bi). Widely spaced resonance lines and their unusual temperature dependence were found in the diethylammonium salts. These findings are accounted for in terms of the crystal structure determined by means of X-ray diffraction.
A CONVENIENT METHOD FOR THE SYNTHESIS OF HOMOALLYL ALCOHOL USING A NEW DESULFONYLATION METHOD
Authors: Kotake Hiroshi , Yamamoto Taku , Kinoshita Hideki
Published: July 2006

2-Tosyl homoallyl alcohol obtained by the reaction of allylic p-tolyl sulfone with aldehyde was found to be easily desulfonylated to homoallyl alcohol by the use of Pd(PPh3)4 as a catalyst and hydride ion as a nucleophile, without any side reactions.
PHOTOCHEMICAL SYNTHESIS OF 1H-PYRANO[3,4-c] PYRIDIN-8[7H]-ONE AND RELATED COMPOUNDS
Authors: Kaneko Chikara , Momose Yu , Naito Toshihiko
Published: July 2006

3-Unsubstituted 4-acetoxy- or 4-methoxy-2-pyridones react photochemically with diethyl acetal of acrolein in acetone. Base treatment of the resultant head-to-tail adducts led to 1,2-dihydrocyclobuta[c]pyridin-3 (4H) -ones having the acetal function at the 1-position. Refluxing of these cyclobutenes in aq. acetic acid resulted in the formation of the title compounds, whose framework is common in the alkaloids contained in Gentiana species and also in the nontryptamine units in some indole and related alkaloids.
STEREOSELECTIVITY IN THE DEHYDRATIVE GLYCOSYLATION WITH HEPTA-O-BENZYL-GLUCOBIOSES
Authors: Morishima Naohiko , Koto Shinkiti , Irisawa Terumi , Hashimoto Yosuke , Yamazaki Masayo , Higuchi Takashi , Zen Shonosuke
Published: July 2006

Dehydrative glycosylation of benzyl 2,3,4-tri-O-benzyl-α-d-glucopyranoside with hepta-O-benzyl-kojibiose, -sophorose, -nigerose, -laminaribiose, -maltose, -cellobiose, -isomaltose, and -gentiobiose gave 16 linear trisaccharide derivatives. The reaction of α(1→2)-, β(1→3)-, α(1→4)- and β(1→6) -linked biose derivatives shows the α-selectivity, while the reaction of the others does the β-selectivity.
RESONANCE RAMAN SCATTERING STUDY ON THE π-CATION RADICALS OF MAGNESIUM, ZINC, AND COPPER TETRAPHENYLPORPHINES
Authors: Yamaguchi Hirohito , Nakano Masaya , Itoh Koichi
Published: July 2006

Resonance Raman spectra were measured for Mg, Zn, and Cu tetraphenylporphines and their π-cation radicals. On one-electron oxidation Raman bands from porphine ring modes show frequency shifts, the magnitudes of which depend on the kind of central metal ions and the nodal structure of the a2u HOMO of the metalloporphines.
PREPARATION AND CHIRAL RECOGNITION OF NEW CHIRAL 18-CROWN-6 ETHERS
Authors: Yamashita Junzo , Minagawa Masaaki , Sonobe Akihiro , Ohashi Shoichi , Kawamura Misao , Shimizu Kunitoshi , Hashimoto Harukichi
Published: July 2006

Four new chiral macrocyclic polyethers of 18-crown-6 type which have phenyl, 1-naphthyl or tetramethylphenyl substituents were prepared, and their chiral recognition for 1-phenylethylamine was discussed.
POLYSULFOXIDES AS NEW TYPE OF PHASE TRANSFER CATALYSTS IN TWO PHASE ALKYLATION
Authors: Furukawa Naomichi , Imaoka Koji , Fujihara Hisashi , Oae Shigeru
Published: July 2006

Tetrakis(hexylsulfinylmethyl)methane(I) and related compounds and polysulfoxides of crown thiaether(IV) were prepared and found to be used as effective catalysts in the binary phase alkylation of phenylacetonitrile(V) and phenylacetone(VI) with alkyl halides to afford selectively the corresponding monoalkylated products in high yields.
AGGREGATION OF CHLOROPHYLL A IN AQUEOUS DIMETHYL SULFOXIDE
Authors: Uehara Kaku , Shibata Keisuke , Nakamura Hideyuki , Tanaka Makoto
Published: July 2006

in aqueous dimethyl sulfoxide(DMSO) solution, chlorophyll a (chl a) aggregated to give several colloidal forms; these were spectroscopically characterized as A-683, A-695, and colorless one. The water/DMSO ratio was the determining factor of the type of form obtained. The spectrum of A-683, which formed in 30–50 v/v % aqueous DMSO solution, was conspicuous bacause of its very high and narrow absorption band at 683±1 nm. The spectroscopic transition among these aggregated forms of chl a in aqueous DMSO is described.
STANNOUS TRIFLATE: A FACILE CROSS-ALDOL REACTION BETWEEN TWO KETONES VIA DIVALENT TIN ENOLATES
Authors: Stevens Rodney W , Iwasawa Nobuharu , Mukaiyama Teruaki
Published: July 2006

Divalent tin enolates, formed from stannous triflate and ketones, react with a second ketone under mild conditions to afford the corresponding cross-aldol products in good to excellent yields. In the case of the cross-coupling with aromatic ketone, enhanced threo-selectivity was observed.
SELECTIVE DEHYDROGENATION OF ETHANE BY NITROUS OXIDE OVER VARIOUS METAL OXIDE CATALYSTS
Authors: Iwamoto Masakazu , Taga Toshiyuki , Kagawa Shuichi
Published: July 2006

Catalytic oxidation of ethane with N2O in the presence of water has been investigated over various metal oxides. Zinc oxide showed a high catalytic activity for the oxidative dehydrogenation of ethane (52.0% conversion and 80.0% selectivity at 823K), while a 14.2% combined selectivity for acetaldehyde and ethanol formation was attained at a 8.9% conversion of ethane over a 2.1 wt% MoO3/SiO2 catalyst at 773K.
STEREOCHEMISTRY OF THE RING CLOSURE REACTION OF OPTICALLY ACTIVE 1-AMINO-2-PROPANOL
Authors: Yahiro Nobuhide
Published: July 2006

Optically active 2-methylethylenimine has been prepared via ring closure reaction of (R)- or (S)-1-amino-2-propanol. The reaction is explained by an intramolecular SN2 mechanism.
AROMATIC IODINATION WITH ALUMINUM AND COPPER(II) CHLORIDES AND IODINE
Authors: Sugita Toshio , Idei Mitsushige , Ishibashi Yoshiyuki , Takegami Yoshinobu
Published: July 2006

Aryl iodides have been synthesized by a simple reaction of aromatic compounds with iodine and an equimolecular mixture of aluminum and copper(II) chlorides. The reaction is widely capable of application, especially to liquid aromatic substrates, with fair to excellent yields.
A NEW METHOD FOR SYNTHESIS OF α,β-UNSATURATED δ-LACTONES VIA MICHAEL ADDITION USING METHYL (PHENYLSULFINYL)ACETATE
Authors: Yoshida Takashi , Saito Shojiro
Published: July 2006

Variuos α,β-unsaturated δ-lactones were synthesized via Michael addition of methyl (phenylsulfinyl)acetate to alkyl vinyl ketones in the presence of tributylphosphine. For example, racemic massoia lactone was obtained in 49% overall yield.
A NEW METHOD FOR THE SYNTHESIS OF β-HYDROXYESTERS BY USING METALLIC TIN
Authors: Harada Taira , Mukaiyama Teruaki
Published: July 2006

Metallic tin or activated metallic tin, prepared by reduction of stannous chloride with lithium aluminum hydride, smoothly reacts with α-haloesters to yield tin enolates, which in turn react with carbonyl compounds under mild conditions to give, after hydrolysis, β-hydroxyesters in high yields.
SIGMATROPIC REARRANGEMENTS OF 2-(TRIMETHYLSILYL)ALLYL ALCOHOL DERIVATIVES: FACILE AND GENERAL ENTRIES TO FUNCTIONALIZED VINYLSILANES
Authors: Mikami Koichi , Kishi Naoyuki , Nakai Takeshi
Published: July 2006

Facile preparations of a variety of vinylsilanes with different functional groups are described which rely upon the utility of the three sigmatropic processes of 2-(trimethylsilyl)allyl alcohol derivatives, i.e., the Claisen and [2,3]-Wittig rearrangement and the tandem [2,3]-Wittig-oxy-Cope rearrangement.
A NEW PROCEDURE FOR DESULFONYLATION: PREPARATION OF β-SUBSTITUTED α,β-UNSATURATED KETONES AND ALDEHYDES
Authors: Yoshida Takashi , Saito Shojiro
Published: July 2006

The treatment of the tert-alkyl sulfones bearing carbonyl group at the β-position with 5 % hydrochloric acid in THF at 30–65 °C afforded β-substituted α,β-unsaturated ketones and aldehydes in excellent yields.
15N CHEMICAL SHIFTS OF 2,4,6-TRIMETHYLPYRIDINE AND ITS ANIONS1
Authors: Konishi Kazuyori , Yoshino Akihiro , Katoh Morimatsu , Matsumoto Hiroshi , Takahashi Kensuke , Iwamura Hiizu
Published: July 2006

The 15N chemical shifts have been observed for three enriched title compounds in diethyl-d10 ether by means of an INDOR technique. The shifts are discussed in terms of the electron densities on the ring nitrogens.
WEITZ-TYPE ORGANOSULFUR π-DONORS WITH A CUMULENIC BOND. VARIATION OF TERMINAL GROUPS AND CUMULENIC BOND IN BIS(THIOPYRANYLIDENE)ETHENE SYSTEM
Authors: Nakasuji Kazuhiro , Takatoh Kohki , Murata Ichiro
Published: July 2006

Unsymmetrical bis(thiopyranylidene)ethene (BTPE) derivatives (4) and (5) and an extended analogue of BTPE (6) have been prepared and their electrochemical properties are compared with those reported for the related compounds.
SYNTHESIS OF THE SEX-ATTRACTANT OF PINE SAWFLIES (DIPRION SPECIES); (2S,3R,7R)- AND (2S,3R,7S)-3,7-DIMETHYLPENTADECAN-2-OL
Authors: Kikukawa Tadashi , Imaida Motomasa , Tai Akira
Published: July 2006

In order to establish the stereochemistry of the sex attractant of diprion species of pine sawflies, two candidate epimers, (2S,3R,7R)-and (2S,3R,7S)-3,7-dimethylpentadecan-2-ol were synthesized by the coupling reaction of optically active C5 and C12 units. The C12 units, (R)-(−)-and (S)-(+)-1-bromo-2-methyludecane were prepared from (R)-(+)-pulegone. The C5 unit, (2R,3S)-2-methyl-3-tetrahydropyranoxy-1-tosyloxybutane was derived from (2S,3S)-2-methyl-3-hydroxybutyric acid prepared by the reported prodedure.
Cu-FLUOR TETRA SILISIC MICA. A NOVEL EFFECTIVE CATALYST FOR THE DEHYDROGENATION OF METHANOL TO FORM METHYL FORMATE
Authors: Morikawa Yutaka , Takagi Katsuhiko , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Cu ion exchanged form of fluor tetra silisic mica (Cu-TSM) is remarkably active and selective for the dehydrogenation of methanol to methyl formate. The exclusive activity of Cu-TSM is caused by both no acidity of TSM itself and the high resistivity of exchanged Cu ions against the reduction to Cu metals. Cu-TSM eclipsed the patent catalysts especially by the selective activity.
PALLADIUM ASSISTED N-METHYL ACTIVATION OF p-SUBSTITUTED N,N-DIMETHYLANILINES
Authors: Sakakibara Tsutomu , Hamakawa Tomoko
Published: July 2006

Intermediates in the reaction of N,N-dimethylanilines with palladium (II) acetate were trapped by acetate ion or oxygen to give N-methyloxygenated and demethylated products, while the trapping by other anilines gave homo- and cross-coupling cyclodimers. The reactions proceed via radical cation formation induced by the palladium salt.
INCREASE AND APERIODIC OSCILLATION IN FLUORESCENCE INTENSITY FROM IRRADIATED SOLUTION OF N-METHYLANTHRANILOHYDROXAMIC ACID IN METHANOL
Authors: Lipczynska-Kochany Ewa , Iwamura Hiizu
Published: July 2006

A methanol solution of N-methylanthranilohydroxamic acid showed a reversible increase and an eventual oscillation of fluorescence intensity during continued excitation at 370 nm in a spectrofluorometer.
REDUCTION OF NITRIC OXIDE BY CARBON MONOXIDE AND WATER IN AN AQUEOUS ALKALINE SOLUTIONS OF HEXARHODIUM HEXADECACARBONYL AND TETRARHODIUM DODECACARBONYL COMPLEXES
Authors: Naito Shuichi , Tamaru Kenzi
Published: July 2006

The reduction of nitric oxide to ammonia was examined in an aqueous KOH solution of Rh6(CO)16 or Rh4(CO)12 complex. It is confirmed that the water gas shift reaction is incorporated with this reaction, providing hydrogen for ammonia formation.
SYNTHESES OF TETRA-t-BUTYLHEXAKISDEHYDRO[18]ANNULENO[26]ANNULENEDIONE AND DI-t-BUTYLDIFUROTRISDEHYDRO[18]ANNULENE
Authors: Iyoda Masahiko , Ogura Fumio , Azuma Tatsuo , Akiyama Shuzo , Nakagawa Masazumi
Published: July 2006

Tetra-t-butylhexakisdehydro[18]annuleno[26]annulenedione, a key substance for the synthesis of tetra-t-butyloctakisdehydro[18]annuleno[18]annuleno[18]annulene has been synthesized. Formation of di-t-butyldifurotrisdehydro[18]annulene was observed on heating a solution of diformylmethylene derivative of the tetrakisdehydro[18]annulene.
PICOSECOND PULSE RADIOLYSIS OF LIQUID n-ALKANES
Authors: Sumiyoshi Takashi , Tsugaru Kazunori , Katayama Meiseki
Published: July 2006

Transient cationic species produced in irradiated liquid n-alkanes (heptane-decane) were observed by the stroboscopic picosecond pulse radiolysis technique at room temperature. The half life, buildup spectra and G ε were obtained and discussed.
THE YIELD OF HYDRATED ELECTRONS AT 30 PICOSECONDS
Authors: Sumiyoshi Takashi , Katayama Meiseki
Published: July 2006

Direct measurements of the yield of hydrated electrons in aqueous solutions were carried out using a stroboscopic picosecond pulse radiolysis system. The yield 30 ps after irradiation, G(eaq−)30ps, was determined to be 4.8±0.3 products per 100 eV as compared to the G(eaq−)100ns of 2.7.
SYNTHESIS OF OLIGORIBONUCLEOTIDES USING 4-METHOXYBENZYL GROUP AS A NEW PROTECTING GROUP OF THE 2′-HYDROXYL GROUP OF ADENOSINE
Authors: Takaku Hiroshi , Kamaike Kazuo
Published: July 2006

4-Methoxybenzyl group was introduced directly to the 2′-hydroxyl group from the reaction of adenosine with 4-methoxybenzyl bromide in the presence of sodium hydride. The 2′-O-(4-methoxybenzyl)adenosine can be successfully used in the synthesis of oligoribonucleotides via phosphotriester approach. The 4-methoxybenzyl group was removed rapidly from the oligoribonucleotides by triphenylmethyl fluoroborate and the completely deblocked oligoribonucleotides were characterized by emzymatic hydrolysis.
A NEW AND FACILE STEREOSELECTIVE SYNTHESIS OF CIS-4a-ARYL-1,2,3,4,4a,5,6,8a-OCTAHYDROISOQUINOLINE DERIVATIVES
Authors: Kano Shinzo , Yokomatsu Tsutomu , Yuasa Yoko , Shibuya Shiroshi
Published: July 2006

Cis-1,2,3,4,4a,5,6,8a-octahydro-2-methyl-4a-phenylisoquinolin-3-one was obtained by cyclization of the acyliminium ion intermediate, derived from the corresponding amide. Reduction of this cyclization product with LiAlH4 in THF afforded cis-1,2,3,4,4a,5,6,8a-octahydro-2-methyl-4a-phenylisoquinoline. In a similar way, the octahydro-4a-(2-methoxyphenyl) isoquinolin-3-one was also prepared from the corresponding amide.
ION-PAIR CHROMATOGRAPHIC DETERMINATION OF ORGANIC BASES USING COLOR REACTION OF TETRABROMOPHENOLPHTHALEIN ETHYL ESTER
Authors: Yoshitoku Youko , Moriyasu Masataka , Hashimoto Yohei
Published: July 2006

By using TBPE as ion-pairing counter-ion whose absorption spectrum differs markedly from that of the resulting ion-pairs, ion pair high pressure liquid chromatographic determination of many organic bases was carried out sensitively without the absorptive background of TBPE added in the mobile phase.
TRICYCLO[3.3.0.02,8]OCTANONES AS BUILDING BLOCKS IN NATURAL PRODUCTS SYNTHESIS. –SYNTHESIS OF (±)-FORSYTHIDE AGLYCON DIMETHYL ESTER–
Authors: Takemoto Tadahiro , Isoe Sachihiko
Published: July 2006

The stereocontrolled synthesis of (±)-forsythide aglycon dimethyl ester from 4-methoxycarbonyl-tricyclo[3.3.0.02,8]octan-3-one (6) is described.
TWO-DIMENSIONAL BAND STRUCTURE OF AN ORGANIC METAL, PERCHLORATE SALT OF BIS(ETHYLENEDITHIOLO)-TETRATHIAFULVALENE (BEDT-TTF)2ClO4(C2H3Cl3)0.5
Authors: Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

The intermolecular overlap integrals and the band structure of the perchlorate salt of bis(ethylenedithiolo)-tetrathiafulvalene (BEDT-TTF)2ClO4(C2H3Cl3)0.5 were calculated using semiempirical molecular orbital calculation. The ratio of the transverse and the longitudinal overlap integrals is 3–10 and the complex is regarded as a new-type two-dimensional organic semimetal.
PHOTOCHEMICAL REACTIONS OF CHLOROANTHRAQUINONES
Authors: Hamanoue Kumao , Yokoyama Kazuo , Miyake Takao , Kasuya Toshihiro , Nakayama Toshihiro , Teranishi Hiroshi
Published: July 2006

Irradiation of 1,5-dichloroanthraquinone (1,5-DCAQ) with 366-nm light in ethanol gives anthrahydroquinone (AQH2) as a final product. This is interpreted in terms of the following consecutive reactions; 1,5-DCAQ\xrightarrowhν1,5-dichloroanthrahydroquinone\xrightarrowhν1–chloroanthraquinone\xrightarrowhν1-chloroanthrahydroquinone\xrightarrowhνanthraquinone\xrightarrowhνAQH2. Similar reactions were also observed for other α-chloroanthraquinones.
STYRENE DERIVATIVES VIA PALLADIUM-CATALYZED VINYLATION OF ARYL IODIDES
Authors: Hallberg Anders , Westerlund Christer
Published: July 2006

A new and efficient method for the preparation of styrene derivatives via Pd-catalyzed vinylation of aromatic systems, using vinyltrimethylsilane as an ethylene equivalent, is described.
ADDITION OF AMINES TO CONJUGATED DIENES CATALYZED BY SOLID BASE CATALYSTS
Authors: Kakuno Yumiko , Hattori Hideshi , Tanabe Kozo
Published: July 2006

Addition of dimethylamine, ethylamine, and piperidine to 1,3-butadiene or 2-methyl-1,3-butadiene effectively occurred over solid base catalysts such as MgO, CaO, SrO, La2O3, and ThO2. Among these catalysts, CaO exhibited the highest activity.
THE EFFECT OF OXYGEN SORPTION ON THE CRYSTAL STRUCTURE OF La1−xSrxCoO3−δ
Authors: Yamazoe Noboru , Furukawa Shoichi , Teraoka Yasutake , Seiyama Tetsuro
Published: July 2006

High temperature X-ray diffractometry was applied to investigate the effects of oxygen sorption on the structure of La1−xSrxCoO3−δ. The lattice parameters of SrCoO2.5+δ (x =1), which was found to have a tetragonal unit cell in this study, were markedly affected by oxygen sorption, while no such effects were observed for the samples x=0, 0.2, and 0.4 with perovskite structure. It is suggested that the structural effects of oxygen sorption arise from the reordering of oxygen vacancies.
THREE NEW ANTI-TUMOR DITERPENOIDS, TRICHORABDALS A, C, AND D
Authors: Node Manabu , Sai Midori , Fuji Kaoru , Fujita Eiichi , Shingu Tetsuro , Watson William H , Grossie David
Published: July 2006

Structures of trichorabdals A, C, and D, isolated from Rabdosia trichocarpa have been determined by means of chemical, spectroscopic, and X-ray crystallographic methods. The compounds possess potent anti-tumor activity.
THE ab initio OPTIMIZED GEOMETRY OF THE 6-SILYLCYCLOHEXADIENYL RADICAL
Authors: Kira Mitsuo , Sakurai Hideki
Published: July 2006

The optimized geometry of the 6-silylcyclohexadienyl radical calculated by the energy gradient method with the STO-3G basis set shows that the radical has a distorted ring structure with the energy minimum at 4.3° of out-of-plane angle.
HIGHLY REGIOSELECTIVE SYNTHESIS OF (1-METHYL-2-PROPENYL)TRIMETHYLSILANE USING THE “CROTYL” GRIGNARD REAGENT AND TRIMETHYLCHLOROSILANE
Authors: Hosomi Akira , Iguchi Hirokazu , Sakurai Hideki
Published: July 2006

Factors influencing the regioselectivity of the reaction of the “crotyl” Grignard reagent (1) with trimethylchlorosilane are investigated. The regioselectivity of the reaction is strikingly controlled by changing solvent and reaction temperature and by the addition of cuprous iodide. (1-Methyl-2-propenyl)trimethylsilane is obtained selectively in THF at low temperature in the presence of cuprous iodide.
INTRODUCTION OF CARBON UNIT AT THE α-POSITION OF ALICYCLIC AMINES UTILIZING A DECARBOXYLATION REACTION WITH MALONIC ACID DERIVATIVES
Authors: Fukawa Hidemichi , Terao Yoshiyasu , Achiwa Kazuo , Sekiya Minoru
Published: July 2006

A new method for introducing carbon unit at the α-position of alicyclic amines has been exploited. The method involves a reaction of trimers of alicyclic imines with malonic acid derivatives, of which decarboxylation leads to a formation of carbon-carbon bond at the α-position of alicyclic amines.
ENANTIOFACE-DIFFERENTIATING HYDROGENATION OF 2-OCTANONE OVER MODIFIED RANEY NICKEL IN THE REACTION MEDIA CONTAINING ORGANIC ACID
Authors: Osawa Tsutomu , Harada Tadao
Published: July 2006

The use of a mixture of THF and carboxylic acid as the reaction medium resulted in drastic increase in the optical yield of the hydrogenation of 2-octanone to optically active 2-octanol over tartaric acid-NaBr-modified Raney nickel (TA-NaBr-MRNi). Among the carboxylic acids examined, pivalic acid gave the highest optical yield (65.6%).
PENTACARBONYLIRON INDUCED REARRANGEMENT OF PHENYL-SUBSTITUTED EPOXIDE UNDER ULTRAVIOLET IRRADIATION
Authors: Kobayashi Tomoshige , Nitta Makoto
Published: July 2006

Phenyl-substituted epoxides rearrange to aldehydes or ketones in the presence of pentacarbonyliron under ultraviolet irradiation. Epoxides which have a phenyl group and an electron-withdrawing substituent at the vicinal positions undergo deoxygenation affording olefins.
SELECTIVE CLEAVAGE OF ESTER AND ETHER FUNCTIONS WITH BBr3 OR Me3SiX IN SUBSTITUTED N-ARYLAZETIDINONES
Authors: Wakselman Michel , Zrihen Maryse
Published: July 2006

At −30°C BBr3 is a milder reagent than Me3SiI and Me3SiCl + NaI for the cleavage of methyl or tert-butyl esters and benzyl ether group of the title β-lactams without destroying the azetidinone ring.
A NEW METHOD FOR THE DIRECT INTRODUCTION OF ALKOXYL GROUP TO SILYL ENOL ETHER WITH ALKYL HYPOCHLORITE CATALYZED BY PALLADIUM(O)
Authors: Nakatsuka Takashi , Mukaiyama Teruaki
Published: July 2006

α-Alkoxyketones and α-ketoacetals are prepared in good yields from silyl enol ethers and alkyl hypochlorites catalyzed by tetrakis (triphenylphosphine)palladium(O).
THE FORMATION OF 2-ACYLAMINO-4-t-BUTYL-6-NITROPHENOLS BY THE PHOTO-IRRADIATION OF 1-ALKOXY-4-t-BUTYL-2,6-DINITROBENZENES
Authors: Obara Heitaro , Onodera Jun-ichi , Hattori Masahiko
Published: July 2006

The photo-irradiation of 1-methoxy-, 1-ethoxy-, and 1-n-propoxy-4-t-butyl-2,6-dinitrobenzenes gave 2-formylamino-, 2-acetylamino-, and 2-propanoylamino-4-t-butyl-6-nitrophenols, respectively. The structures of these photo-irradiation products were confirmed by the comparison with the synthetic samples.
TOTAL SYNTHESIS OF (±)-ISOALANTOLACTONE AND (±)-DIHYDROCALLITRISIN
Authors: Tada Masahiro
Published: July 2006

Two eudesmanolides having opposite stereochemistry of lactone ring each other, (±)-isoalantolactone and (±)-dihydrocallitrisin were synthesized stereoselectively by a route involving alkylation of 2-methyl-3-furoic acid and oxidation of furan ring.
SYNTHESIS OF OPTICALLY PURE ENKEPHALIN ANALOG, [D-Ala2, Leu5-ol]ENKEPHALIN, USING CHIRAL β-LACTAMS AS SYNTHETIC INTERMEDIATES
Authors: Hatanaka Naoto , Abe Rumiko , Ojima Iwao
Published: July 2006

Optically pure pentapeptide, l-Tyr-d-Ala-Gly-l-Phe-l-Leu-ol (1) which is an analog of opioid hormone, enkephalin, was successfully synthesized by using β-lactam building blocks as chiral synthons of peptide units.
SYNTHESIS OF PEPTIDES CONTAINING HYDROXYAMINO ACIDS BY THE MIXED ANHYDRIDE METHOD WITHOUT PROTECTING THE HYDROXYL FUNCTIONS
Authors: Ueki Masaaki , Inazu Toshiyuki
Published: July 2006

Dimethylphosphinothioyl(Mpt) mixed anhydrides of N-protected amino acids were found to be isolatably stable and useful for the synthesis of hydroxyamino acid containing peptides without protecting the side-chain hydroxyl functions. They were applied for the solid phase synthesis of an enkephalin analog extended at C-terminal.
THREE NEW SESQUITERPENE PHENOLS OF THE ENT-HERBERTANE CLASS FROM THE LIVERWORT HERBERTA ADUNCA
Authors: Matsuo Akihiko , Yuki Shunji , Nakayama Mitsuru , Hayashi Shûichi
Published: July 2006

Three sesquiterpene phenols with an ent-herbertane skeleton have been isolated from the liverwort Herberta adunca, and the elucidation of their structures and absolute configurations has been achieved on the basis of the chemical and spectral evidence.
TOTAL SYNTHESES OF ZALUZANIN C, ZALUZANIN D, AND 3-EPIZALUZANIN C
Authors: Ando Masayoshi , Yamaoka Hiroaki , Takase Kahei
Published: July 2006

The biologically active guaianolides, zaluzanin C and zaluzanin D, and the stereoisomeric guaianolide, 3-epizaluzanin C, have been synthesized by two different procedures. The stereochemistry at C3 of zaluzanin C has been established to be S configuration by this synthesis.
A NEW LIBRARY SEARCH SYSTEM FOR THE IDENTIFICATION OF MASS SPECTRA
Authors: Shindo Junko , Yasuhara Akio , Ito Hiroyasu , Mizoguchi Tsuguo
Published: July 2006

A new library search system for mass spectra consisting of the pre-search involving seven step filters and the main search modified on the basis of the Probability Based Matching method has been developed.
REACTION OF ETHYL 2-AZIDOPROPENOATE WITH NUCLEOPHILES
Authors: Kakimoto Masa-aki , Kai Mariko , Kondo Kiyosi , Hiyama Tamejiro
Published: July 2006

The title compound is transformed into ethyl 2-aminopropenoate having 3-phenylthio or 3-ethoxy substituent upon treatment with thiophenol or sodium (or lithium) ethoxide in ethanol, respectively. The reaction with ethyl mercaptoacetate is also discussed.
A NEW REDUCTIVE SILYLATION OF p-QUINONES WITH HEXAMETHYLDISILANE CATALYZED BY IODINE
Authors: Matsumoto Hideyuki , Koike Shunji , Matsubara Ikuya , Nakano Taichi , Nagai Yoichiro
Published: July 2006

In the presence of a catalytic amount of iodine, hexamethyldisilane can reductively silylate p-quinones under mild conditions to afford 1,4-bis(trimethylsiloxy)arenes in high yields.
SYNTHETIC STUDIES ON TROPONIN I ACTIVE SITE. PREPARATION OF A HEXADECAPEPTIDE WITH BINDING ACTIVITY TOWARD TROPONIN C
Authors: Nozaki Sukekatsu , Katayama Eisaku , Muramatsu Ichiro
Published: July 2006

A hexadecapeptide corresponding to a partial sequence (positions 10–25) of troponin I from rabbit fast skeletal muscle was synthesized in a combination of the ‘hold-in-solution’ method and the usual liquid phase method. The synthesized peptide (1) formed a Ca2+-dependent complex with rabbit skeletal troponin C. The CD spectra of 1 showed that 1 in hydrophobic media contained α-helical peptide bonds.
PREPARATION OF TRIFLUOROACETONITRILE PHENYLIMINE AND ITS REACTIONS WITH SOME DIPOLAROPHILES
Authors: Tanaka Kiyoshi , Maeno Seiji , Mitsuhashi Keiryo
Published: July 2006

Trifluoroaceto-N-phenylhydrazonoyl halides, the precursors of trifluoroacetonitrile phenylimine, prepared by halogenation of trifluoroacetaldehyde phenylhydrazone, react with various olefins and acetylenes in the presence of triethylamine to give 3-trifluoromethylpyrazolines and pyrazoles, respectively. The regioselective results are discussed in terms of HOMO-LUMO interaction of trifluoroacetonitrile phenylimine and dipolarophiles.
PHOTOCATALYTIC HYDROGEN PRODUCTION FROM A MIXTURE OF WATER AND 2-PROPANOL ON SOME SEMICONDUCTORS
Authors: Domen Kazunari , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

The photocatalytic production of H2 and acetone from a mixture of water and 2-propanol in gas and liquid phases was studied on some semiconductor powders such as NiO supported SrTiO3, CdS and TiO2 etc. This reaction did not proceed without H2O, indicating the coupling of the photodecomposition of H2O and the photo-oxidation of 2-propanol.
THE J BAND OF THE MALACHITE GREEN-POLY(α-l-GLUTAMIC ACID) COMPLEX: THE CONDITIONS FOR ITS APPEARANCE IN AQUEOUS SOLUTIONS
Authors: Yamaoka Kiwamu , Shimadzu Mitsuaki
Published: July 2006

The optimum conditions for the appearance of the J band of Malachite Green bound to poly(α-l-glutamic acid) are established by the method of absorption spectroscopy. The J band in the visible spectra depends very critically on such factors as pH, aging, mixing ratio, salt concentration, and, above all, the polymer conformation.
A CONVENIENT METHOD FOR THE PREPARATION OF 1-(METHYLTHIO) AND 1-(PHENYLTHIO)VINYLLITHIUM REAGENTS
Authors: Takeda Takeshi , Furukawa Hiroyuki , Fujiwara Tooru
Published: July 2006

1-(Methylthio) and 1-(phenylthio)vinyllithiums were prepared by the treatment of the corresponding 2-methoxyethyl sulfides with twice molar amounts of butyllithium in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA). β-Alkylthio-β,γ-unsaturated alcohols were obtained in good yields by the reaction of the lithium salts with aldehydes.
A VERSATILE SYNTHESIS OF ARYLACETONES FROM ARYL HALIDES AND ACETYLACETONATE
Authors: Sugai Saburo , Ikawa Hiroshi , Okazaki Tokuji , Akaboshi Sanya , Ikegami Shiro
Published: July 2006

Reaction of aryl halides with sodium or potassium acetylacetonate in the presence of a copper catalyst affords directly arylacetones resulted from deacetylation of initially formed 3-arylacetylacetones in good yields.
A NOVEL REACTION OF 8,16-BIS(BROMOMETHYL) [2.2]METACYCLOPHANES WITH PHENYL LITHIUM AND PREPARATION OF 8,16-UNSYMMETRICALLY DISUBSTITUTED [2.2]METACYCLOPHANES
Authors: Tashiro Masashi , Yamato Takehiko
Published: July 2006

The reaction of 8,16-bis(bromomethyl) [2.2]metacyclophanes (2) with phenyl lithium in ethyl ether afforded the unexpected spiro compounds 3. It was also found that 8,16-unsymmetrically disubstituted [2.2]metacyclophanes 9 such as 8-methyl-16-halomethyl- and 8-methyl-16-methoxy derivatives were easily prepared from 3.
A FACILE PREPARATION OF RIFAMYCIN DERIVATIVES BY USE OF MANGANESE DIOXIDE
Authors: Seong Baik Lin , Han Moon Hi
Published: July 2006

Rifamycin O, rifamycin S and rifamycin SV were prepared in good yields (88–94%) by the oxidation and hydrolytic cleavage of rifamycin B in the presence of manganese dioxide.
HYDROGEN TRANSFER OF 2,5-DIHYDROANISOLE TO HYDROGEN ACCEPTORS PROMOTED BY BUTYLLITHIUM
Authors: Hiramatsu Mitsuo , Fujinami Tatsuo , Sakai Shizuyoshi
Published: July 2006

2,5-Dihydroanisole treated with butyllithium reacts with hydrogen acceptors as hydrogen donor more predominantly than carbanion to give the corresponding hydrogenated products in good yields.
FORMATION OF NOVEL CAGE COMPOUNDS VIA END0-[3 + 2] CYCLOADDUCTS BETWEEN THIAZOLIUM N-METHYLIDES AND METHYLENECYCLOPROPENES
Authors: Tsuge Otohiko , Shimoharada Hiroshi , Noguchi Michihiko , Kanemasa Shuji
Published: July 2006

Thiazolium N-phenacylide and N-dicyanomethylide react with a methylenecyclopropene bearing an aryl group on the 4-position to give novel cage compounds, 6,8-thiazapentacyclo[6.3.1.01,10.05,12.07,11]dodecenes. The reaction proceeds via an intramolecular Diels–Alder reaction of the initially formed endo-[3 + 2] cycloadducts, followed by a hydrogen shift.
OPTICALLY ACTIVE F-2-ISOPROPOXYPROPIONIC ACID : A NOVEL DERIVATIZING AGENT FOR GAS CHROMATOGRAPHIC ANALYSIS
Authors: Kawa Hajimu , Yamaguchi Fumihiko , Ishikawa Nobuo
Published: July 2006

F-2-Isopropoxypropionic acid (PIPA) was resolved into enantiomers via its diastereomeric (+)-1-phenylethylamide. (+)-F-2-Isopropoxypropionyl derivatives of several chiral 1-arylalkylamines and α-amino acids were effectively resolved by gas chromatography at low temperature.
AN EFFICIENT REGIO- AND STEREOSPECIFIC ALKENYLATION OF PHENOLIC ETHERS BY PRENYL AND GERANYL DIISOPROPYL PHOSPHATES
Authors: Araki Shuki , Manabe Shin-ichi , Butsugan Yasuo
Published: July 2006

Prenyl and geranyl diisopropyl phosphates readily alkenylate a variety of phenolic ethers regio- and stereospecifically without any appreciable side reactions.
THE LOCAL TOPOLOGICAL DEPENDENCE OF RING CURRENT IN POLYCYCLIC AROMATIC HYDROCARBONS
Authors: Mizoguchi Noriyuki
Published: July 2006

Ring currents in individual hexagons of many catacondensed hydrocarbons were calculated systematically. It was found that the values of ring currents are distributed within the four different ranges correponding to the four classes of hexagon which are classified by the local topological structure.
ELECTRODE REACTION OF METHYL VIOLOGEN COUPLED WITH POLYSTYRENE SULFONATE
Authors: Kobayashi Katsuyoshi , Niki Katsumi
Published: July 2006

The addition of polystyrene sulfonate (PSS) to methyl viologen (MV2+) leads to a reversible one-electron transfer reaction of MV2+ without the complication due to the adsorption of both MV2+ and MV.+. MV2+ molecules coupled with a PSS molecule act as equivalent and weakly-interacting sites. The interaction between active sites is allosteric.
A CONVERSION OF HUMULENE TO HIRSUTENE
Authors: Misumi Shunjiro , Matsushima Hiroshi , Shirahama Haruhisa , Matsumoto Takeshi
Published: July 2006

Humulene has been transformed into 1,4,4-trimethyltricyclo [6.2.1.02,6]undecan-ll-one, a key intermediate for the synthesis of hirsutene, through a process which simulates the biosynthetic pathway assumed for the latter sesquiterpene.
LASER RAMAN SPECTROSCOPIC STUDY OF A DIABETIC CATARACTOUS LENS
Authors: Ozaki Yukihiro , Mizuno Aritake , Kamada Yoshio , Itoh Koichi , Iriyama Keiji
Published: July 2006

Raman spectrum of a diabetic cataractous lens was measured and compared with the spectrum of a normal lens. These spectra showed an appreciable difference in the relative intensity of the tyrosine doublet near 840 cm−1, indicating that the strength of hydrogen bonding by some tyrosyl residues changed upon lens opacification.
EFFECT OF THE EXCITATION DURATION ON THE DECAY BEHAVIOR OF THE TEMPERATURE-INDEPENDENT DELAYED FLUORESCENCE
Authors: Taen Shoji , Gondo Yasuhiko
Published: July 2006

Under different excitation durations, the decay law has been studied on the temperature-independent delayed fluorescence in the mixed crystals of benzo[f]quinoline in biphenyl host at 77 K. An extreme reduction of the excitation duration has been found to lead to a decay law of the form, IDF(t) = IDF(0)/(1 + at)2.
ROLE OF WATER IN ALUMINA-ASSISTED SOLID–LIQUID INTERFACIAL REACTION
Authors: Ando Takashi , Kawate Takehiko , Yamawaki Junko , Hanafusa Terukiyo
Published: July 2006

Heterogeneous reaction between octyl bromide and alkali acetate solid in toluene is facilitated in the presence of alumina and a trace of water. The reactivity shows a maximum for a certain amount of water, and this optimum amount varies depending on the alkali metal cation. Role of water in the interfacial reaction is discussed.
A NEW PALLADIUM CATALYZED AROMATIC ACETONYLATION BY ACETONYLTRIBUTYLTIN
Authors: Kosugi Masanori , Suzuki Mikio , Hagiwara Isao , Goto Katsuhisa , Saitoh Kyoko , Migita Toshihiko
Published: July 2006

The reaction of acetonyltributyltin, prepared from tributyltin methoxide and isopropenyl acetate in situ, with aryl bromide in the presence of a catalytic amount of PdCl2(o-Tolyl3P)2 was found to give arylacetones in good yields.
INFRARED AND RAMAN SPECTROSCOPIC STUDIES ON MOLECULAR CONFORMATIONS OF F(CH2)nF (n=3–6)
Authors: Matsuura Hiroatsu , Sakakibara Masaaki , Murata Hiromu
Published: July 2006

The infrared and Raman spectra of F(CH2)nF (n=3–6) were measured and analyzed on the basis of the normal coordinate treatment. The spectral analyses indicated that the molecule in the solid state takes the gauche-gauche conformation for n=3, gauche-trans-gauche’ for n=4, gauche-trans-trans-gauche for n=5, and gauche-trans-trans-trans-gauche’ for n=6.
NEW SYNTHESIS OF METHYL 2-TRIORGANOSILYL-3-BUTENOATES AS A NEW SYNTHON OF 3-METHOXYCARBONYLALLYL ANION
Authors: Naruta Yoshinori , Uno Hidemitsu , Maruyama Kazuhiro
Published: July 2006

Methyl 2-triorganosilyl-3-butenoates, which are selectively obtained from the carboxylation of the corresponding allylsilanes via allylic aluminates, react with various kinds of electrophiles to give γ substituted (E)-α,β-unsaturated esters in highly regio and stereoselective manner with the aid of a Lewis acid.
PROTECTION OF IMIDE GROUP OF URACIL MOIETY BY MEANS OF 2,2,2-TRICHLORO-TERT-BUTYLOXYCARBONYL CHLORIDE: A SELECTIVE SYNTHESIS OF 2′-O-METHYLURIDINE
Authors: Kamimura Takashi , Masegi Tsukio , Hata Tsujiaki
Published: July 2006

2,2,2-Trichloro-tert-butyloxycarbonyl group (TCBOC) was useful protecting group for the protection of imide function of uracil moiety. Starting from N3-TCBOC uridine derivative, 2′-O-methyluridine was selectively synthesized without formation of N3-methyluridine derivatives.
SYNTHESIS AND ELECTROCHEMICAL CHARACTERISTIC OF 1,2-BIS(PHENALEN-1-YLIDENE)ETHENE. AN AMPHOTERIC FOUR-STAGE REDOX HYDROCARBON
Authors: Nakasuji Kazuhiro , Yoshida Keiji , Murata Ichiro
Published: July 2006

Electrochemical evidence presents that both two-stage oxidation and reduction steps (as an amphoteric four-stage redox system) are possible for 1,2-bis(phenalen-1-ylidene)ethene which has been synthesized starting from an isomeric mixture of diphenalenylacetylene through hydride abstraction and deprotonation procedure.
TRANSITION METAL PHOSPHINE COMPLEXES POSSESSING A PHASE TRANSFER FUNCTION. PREPARATION AND PROPERTIES OF POLYETHER-SUBSTITUTED PHOSPHINES AND THEIR PALLADIUM COMPLEXES
Authors: Okano Tamon , Yamamoto Manabu , Noguchi Takeo , Konishi Hisatoshi , Kiji Jitsuo
Published: July 2006

For the purpose of endowing transition metal phosphine complexes with a phase transfer function, tertiary phosphines modified by polyether chains were prepared, and their properties were examined. The palladium complexes of these phosphines were very efficient as catalysts for the reduction of bromobenzene with sodium hydride under a liquid–solid two-phase condition.
EFFECTIVE SUPPORTED-In2O3 FOR THE PRODUCTION OF HYDROGEN FROM WATER BY THE REDUCTION-OXIDATION CYCLE OF In2O3
Authors: Otsuka Kiyoshi , Shibuya Shin-ichi , Morikawa Akira
Published: July 2006

Eleven kinds of carriers for In2O3 have been tested for the production of hydrogen from water by a reduction and oxidation cycle of In2O3. Of these, the most effective carriers were TiO2, ZrO2, active carbon and ZnO, because the high enhancing effects on the rates of reduction and oxidation and the high final yields of hydrogen by the reduced In2O3 have been observed by using these carriers.
A HIGHLY ACTIVE SUPPORTED CATALYST FOR OLEFIN HYDROGENATION FROM COLLOIDAL NICKEL BORIDE
Authors: Nakao Yukimichi
Published: July 2006

Supported catalysts, which were prepared from colloidal nickel boride by immobilizing on inorganic substances such as Mg(OH)2, exhibited higher activity for olefin hydrogenation than a sol-type catalyst of colloidal nickel boride protected by polyvinylpyrrolidone.
PHOTOLUMINESCENCE DURING ADSORPTION OF AMMONIA AND OTHER SIMPLE MOLECULES ON AN ACTIVATED EUROPIUM ION-EXCHANGED MORDENITE
Authors: Arakawa Tsuyoshi , Takakuwa Midori , Shiokawa Jiro
Published: July 2006

It has been studied the adsorption of simple molecules on an activated Eu(III) ion-exchanged mordenite by the measurement of the luminescence of Eu2+ ion which was produced by the evacuation at 500°C. The emission peak for Eu2+ ion shifts to shorter wavelength on the exposure of ammonia and other simple molecules. The magnitude of the shift is correlated to the specific dielectric constant of adsorbates.
EFFICIENT SYNTHESIS OF ACETOXYFIMBROLIDES AND BECKERELIDES ANALOGS
Authors: Kotsuki Hiyoshizo , Monden Mitsugu , Ochi Masamitsu
Published: July 2006

An efficient synthesis of acetoxyfimbrolides and beckerelides analogs has been developed via peracid oxidation of 2-methyl-4-(1-acetoxybutyl)furan as the key synthetic step. Antimicrobial activity of the products has also been tested.
NOVEL PROPELLANE TYPE ADDUCTS OF 3-METHYL-10-THIAISOALLOXAZINE
Authors: Maki Yoshifumi , Tanabe Miyuki , Sako Magoichi , Hirota Kosaku , Harano Kazunobu
Published: July 2006

The reaction of 3-methyl-10-thiaisoalloxazine (2) with 1,2-ethanedithiol and 2-mercaptoethanol gave novel propellane type adducts and 3a and 3b, respectively.
MELAMINE-HYDROGEN FLUORIDE SOLUTION. A HIGHLY EFFECTIVE AND CONVENIENT HYDROFLUORINATION REAGENT OF ALKENES
Authors: Yoneda Norihiko , Abe Takafumi , Fukuhara Tsuyoshi , Suzuki Akira
Published: July 2006

A solution of 14% (w/w) melamine in 86% (w/w) hydrogen fluoride has been found to be stable, and more convenient and effective hydrofluorinating reagent for alkenes than those of other organic amine-hydrogen fluoride reagents.
SYNTHESIS OF ACETIC ANHYDRIDE BY VAPOR PHASE CARBONYLATION OF METHYL ACETATE WITH A NICKEL-ACTIVE CARBON CATALYST
Authors: Fujimoto Kaoru , Shikada Tsutomu , Miyauchi Michiharu , Tominaga Hiro-o
Published: July 2006

Vapor phase carbonylation of methyl acetate on nickel-active carbon catalyst was studied under pressurized conditions in the presence of methyl iodide as a promoter. High pressure was essential for the acetic anhydride formation. A fairly large amount of acetic acid, by-product, was also formed under the water-free reaction condition.
COMPLETE CHROMATOGRAPHIC RESOLUTION OF TRIS(ACETYLACETONATO)COBALT(III) AND CHROMIUM(III) ON AN OPTICALLY ACTIVE POLY(TRIPHENYLMETHYL METHACRYLATE) COLUMN
Authors: Okamoto Yoshio , Honda Shiro , Yashima Eiji , Yuki Heimei
Published: July 2006

Tris(acetylacetonato)Co(III) and Cr(III) were completely resolved by HPLC on a (+)-poly(triphenylmethyl methacrylate) column. Optical data of pure enantiomers were obtained and the structure of the polymer was discussed on the basis of the results of the resolution.
REACTION OF ORGANOCADMIUM REAGENTS WITH ETHYL CYANOFORMATE: PREPARATION OF α-KETO ESTERS
Authors: Akiyama Yasunobu , Kawasaki Tomomi , Sakamoto Masanori
Published: July 2006

Organocadmium reagents reacted with the cyano-function of ethyl cyanoformate in the presence of ZnCl2 to afford the corresponding α-keto esters.
A NOVEL BASE CATALYZED REARRANGEMENT OF PSEUDOANISATIN. X-RAY CRYSTALLOGRAPHIC ANALYSIS OF THE REARRANGEMENT PRODUCT
Authors: Kouno Isao , Irie Hiroshi , Kawano Nobusuke , Taga Tooru , Osaki Kenji
Published: July 2006

The structure of a base catalyzed rearrangement product of pseudoanisatin has been determined by an X-ray crystallographic analysis as the formula, indicating a novel stereoselective reaction which includes steric inversion at C-3 and C-4. The reaction mechanism is discussed.