bluuebunny/crossref_metadata_2025_split huggingface dataset:
SYNTHESIS OF THE TWO ISOMERS OF THE POTENTIAL SEX PHEROMONE OF THAUMETOPOEA PTTVOCMPA (LEPIDOPTERA, NOTODONTIDAE) AND RELATED MODEL COMPOUNDS
Authors: Camps Francisco , Coll José , Canela Ramón , Guerrero Angel , Riba Magf 
Published: July 2006

Abstract
The synthesis of the major component of the sex pheromone secretion of the processionary moth, Tkawnztopoeja pltyocampa (Denis and Schiff.) (Lepidoptera, Notodontidae), (Z)-13-hexadecen-ll-ynyl acetate (1), the corresponding (E)-isomer (2) and the four structurally related model compounds (Z⁄E,Z,Z)-5,9,13-hexadecatrienyl acetate (3), (Z⁄E,Z,Z)-3,7,ll-hexadecatrienyl acetate (4), (Z⁄E,E,Z)-7,9,13-hexadecatrienyl acetate (5) and (Z)-7-hexadecen-5-ynyl acetate (6) is described.
PHOTOINDUCED OXIDATIVE CLEAVAGE OF ARYLCYCLOPROPANES IN THE PRESENCE OF ORGANIC ELECTRON-ACCEPTOR
Authors: Mizuno Kazuhiko , Ogawa Jun , Otsuji Yoshio 
Published: July 2006

Abstract
The cyclopropane ring of arylcyclopropanes is oxidatively cleaved by irradiation in polar solvents containing nucleophiles such as alcohols, water, and sodium cyanide in the presence of electron-acceptor such as 1,4-dicyanobenzene and 1-cyanonaphthalene, giving nucleophile-incorporated products. This photoreaction proceeds via an electron-transfer from the cyclopropanes to the excited electron-acceptors, and the cation radicals of arylcyclopropanes are involved as key intermediates.
A FACILE PREPARATION OF DIALKYL CARBONATES FROM POTASSIUM CARBONATE AND ALKYL BROMIDES BY USING ORGANOSTANNYL COMPOUND AS A CATALYST
Authors: Fujinami Tatsuo , Sato Shinichi , Sakai Shizuyoshi 
Published: July 2006

Abstract
Dialkyl carbonates were easily prepared by the heterogeneous reaction of solid potassium carbonate with alkyl bromides in dimethylformamide or dimethylsulfoxide in the presence of organostannyl compound such as hexabutyldistannoxane or chlorotributylstannane. Mixed catalytic system consisting of a tributylstannyl compound and 18-Crown-6 was much effective even in less polar solvents.
EXCISANIN A AND B, NEW DITERPENOIDS FROM RABDOSIA EXCISA
Authors: Han-dong Sun , Xi-chang Sun , Zhon-wen Lin , Yan-long Xu , Minami Yoshinori , Marunaka Teruyoshi , Fujita Tetsuro 
Published: July 2006

Abstract
Chemical investigation of the bitter principles from Rabdosia Excisa has led to the isolation and characterization of two new diterpenoids having an ent-kaurene skeleton, excisanin A and B, and their structures were established by spectroscopic and chemical data.
STEREOSELECTIVE DEACYLATION OF LONG-CHAIN p-NITROPHENYL N-ACYLPHENYLALANATES BY PALMITOYL-l-HISTIDINE IN A BILAYER SYSTEM
Authors: Ueoka Ryuichi , Matsumoto Yoko , Ninomiya Yashushi , Nakagawa Yoshiharu , Inoue Kazuhiro , Ohkubo Katsutoshi 
Published: July 2006

Abstract
In the stereoselective deacylation of H–[CH2]n-1–CONHCH(CH2Ph)CO2–C6H4NO2-p (n=10 and 16), the bilayer catalytic systems of palmitoyl-l-histidine and double-chain surfactants ([CmH2m+1]2N[CH3]2Br; m=12 and 14) offered the relatively higher enantiomer rate ratios (kcatL⁄kcatD=3.7–5.6) as compared with those (kcatL⁄kcatD=3.5–3.6) obtanined with the comicellar system of palmitoyl-l-histidine and octadecyltrimethylammonium chloride.
ESR STUDIES OF THE Cu(II) COMPLEXES OF N,N′-BIS(PICOLINOYL)-1,3-PROPANEDIAMINE, A PYRIDINE CONTAINING POLYPEPTIDE MODEL LIGAND
Authors: Kajikawa Yuji , Mukai Kazuo , Ishizu Kazuhiko , Ojima Heijiro 
Published: July 2006

Abstract
A triplet ESR spectrum (S = 1) was observed for the dimerous N,N′-bis-(picolinoyl)-1,3-prcpanediaminato Cu(II) complex formed in acidic aqueous solution (pH = 3.8). Based on the simple dipole model, internuclear copper–copper atomic distance in the stacked dimerous copper chromophore was estimated to be about 4 Å.
A NOVEL PHOTO-INDUCED CHARGE SEPARATION BY THE USE OF ELECTRON MIGRATION ON THE MAN-MADE MOLECULAR ASSEMBLIES
Authors: Takuma Keisuke , Sakamoto Tetsuo , Matsuo Taku 
Published: July 2006

Abstract
Electron exchanges between amphipathic viologens lead to electron migration along the surface of a molecular bilayer system, which affords efficient means for photo-induced charge separation (PICS) as sensitized by an amphipathic derivative of tris(2,2′-bipyridine)ruthenium (II) complex.
CHROMATOGRAPHIC RESOLUTION OF ENANTIOMERS HAVING AROMATIC GROUP BY OPTICALLY ACTIVE POLY(TRIPHENYLMETHYL METHACRYLATE)
Authors: Okamoto Yoshio , Okamoto Ichiro , Yuki Heimei 
Published: July 2006

Abstract
Various racemic compounds containing aromatic groups were completely resolved by high-performance liquid chromatography on optically active (+)-poly(triphenylmethyl methacrylate) using methanol as eluent.
INTERVENTION OF SULFINYL SULFONE IN THE OXIDATION PATHWAY OF THIOSULFONIC S-ESTER TO α-DISULFONE
Authors: Oae Shigeru , Takata Toshikazu 
Published: July 2006

Abstract
Sulfinyl sulfone was confirmed as a stable intermediate in direct NMR study on the oxidation of thiosulfonic S-ester with MCPBA in CDCL3, by comparing the chemical shifts with those of the authentic sample prepared by condensation method.
PHOSPHORYLATION OF INOSINE WITH CYCLO-TRIPHOSPHATE
Authors: Tsuhako Mitsutomo , Fujimoto Mayumi , Ohashi Shigeru 
Published: July 2006

Abstract
Phosphorylation of inosine with cyclo-triphosphate(P3m) in aqueous solution was studied by means of anion-exchange chromatography and high performance liquid chromatography. P3m reacted with inosine at 70°C and room temperature and at pH 12 to form inosine 2′- and 3′-monophosphates. The yields of 2′- and 3′-monophosphates were about 33 and 26%, respectively.
ACCORDION-TYPE AGGREGATE OF WATER-SOLUBLE MESO-TETRAPHENYLPORPHYRIN DERIVATIVES
Authors: Shimidzu Takeo , Iyoda Tomokazu 
Published: July 2006

Abstract
An anionic water-soluble meso-tetraphenylporphyrin derivatives and cationic one form an accordion-type aggregate, i.e., the face-to-face type multi-structure, even in relatively low concentration.
A SYNTHETIC METHOD FOR NOVEL 1,2,3-TRISUBSTITUTED CYCLOPENTANE DERIVATIVES, 1-HYDROXYMETHYL-3-METHOXY-2-OXABICYCLO[2.2.1]HEPTANE-7-CARBOXYLIC LACTONES
Authors: Imagawa Takeshi , Nakagawa Tsunefumi , Matsuura Kazuyuki , Akiyama Tetsuo , Kawanisi Mituyosi 
Published: July 2006

Abstract
The reaction of furfuryl alcohols with maleic anhydride leads to tricyclic lactone-carboxylic acids through the sequence of esterification and intramolecular Diels–Alder reaction. Anodic oxidative decarboxylation of the hydrogenated products in MeOH affords 1,2,3-trisubstituted cyclopentane derivatives, viz. 1-hydroxymethyl-3-methoxy-2-oxabicyclo[2.2.1]heptane-7-syn-carboxylic lactones, potential intermediates for synthesis of iridoids.
INTRAMOLECULAR DIELS–ALDER REACTIONS OF VINYLFURAN DERIVATIVES A NOVEL APPROACH TO BENZOFURANS
Authors: Kotsuki Hiyoshizo , Kawamura Ayumi , Ochi Masamitsu , Tokoroyama Takashi 
Published: July 2006

Abstract
A successful intramolecular Diels–Alder reaction of vinylfuran derivatives was reported. The adducts were proved to be a useful precursor of substituted benzofurans.
SYNTHESIS OF SOME RACEMIC ISOMERS OF VALIDOXYLAMINE A
Authors: Ogawa Seiichiro , Toyokuni Tatsushi , Suami Tetsuo 
Published: July 2006

Abstract
Two racemic isomers of validoxylamine A were synthesized by the condensation reaction of the blocked Dl-validamine and the allyl bromide, the precursor of the unsaturated branched-chain cyclitol moiety.
CHEMILUMINESCENT REACTIONS OF C2+ IONS WITH H2 MOLECULES
Authors: Ishikawa Toshiaki , Sasaki Hiromi , Inouye Hokotomo 
Published: July 2006

Abstract
Chemiluminescence spectra produced by reactions of C2+ ions with H2 molecules were observed with a spectral resolution of 20 Å at collision energies between 5.4 and 22 eV in the center-of-mass system. Emission from the singlet system CH+(B 1Δ) was observed as well as the bands due to the triplet system CH+(b 3Σ−).
RHODIUM CARBONYL-CATALYZED CARBONYLATION OF ACETYLENES IN THE PRESENCE OF OLEFINS AND PROTON DONORS. SYNTHESIS OF 5-ALKYL-2(5H)-FURANONES
Authors: Hong Pangbu , Mise Takaya , Yamazaki Hiroshi 
Published: July 2006

Abstract
Rhodium carbonyl-catalyzed reactions of internal acetylenes with ethylene and CO in protic solvents, e.g., ethanol, gave 3,4-disubstituted-5-ethyl-2(5H)-furanones in good yields. By using propylene or methyl acrylate instead of ethylene, small amounts of 5-n-/iso-propyl-2(5H)-furanones or 5-[2-(methoxycarbonyl)ethyl]-2(5H)-furanone were obtained.
NEW SYNTHETIC METHOD OF THIOALDEHYDES FROM β-IMINO-NITRILES AND DITHIOFORMATE
Authors: Muraoka Motomu , Yamamoto Tatsuo , Takeshima Tatsuo 
Published: July 2006

Abstract
A series of stable monomeric α-cyano-β-imino-thioaldehydes were synthesized from β-imino-nitriles and potassium dithioformate.
PREPARATION OF NEW HYDROPEROXO COMPLEX OF RHODIUM
Authors: Suzuki Hiroharu , Matsuura Shinji , Moro-oka Yoshihiko , Ikawa Tsuneo 
Published: July 2006

Abstract
Novel hydroperoxo complex of rhodium, (Ph3P)2(acac)ClRhOOH is prepared by the reaction of rhodium peroxo complex, (Ph3P)3 ClRhO2, with acetylacetone. This new complex is characterized by means of IR, NMR, elemental analysis, and 18O2 labeling experiment. (Ph3P)2(acac)ClRhOOH decomposes in chloroform solution to (Ph3P)2(acac)RhCl2 by way of the corresponding hydroxo complex.
INCLUSION OF AROMATIC GUEST MOLECULES WITH BULKY SUBSTITUENTS IN LAYERED METAL COMPLEX HOST trans-BIS(DIMETHYLAMINE)CADMIUM(II) TETRA-catena-μ-CYANONICKELATE(II)
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake 
Published: July 2006

Abstract
A novel type of the metal complex host Cd(NH(CH3)2)2Ni(CN)4 derived by replacing the NH3 in Hofmann-type host Cd(NH3)2Ni(CN)4 by NH(CH3)2includes the benzene derivatives with several bulky substituents between the layered structure, the guest molecules which have never been enclathrated into Hofmann-type and the analogous hosts.
DIRECT PHOTOLYSIS AT 185 NM OF CYCLOPENTENE AND 2-NORBORNENE. A NOVEL REACTION CHANNEL FOR π,π* EXCITED SINGLET ALKENE
Authors: Inoue Yoshihisa , Mukai Toshio , Hakushi Tadao 
Published: July 2006

Abstract
Upon direct irradiation at 185 nm, the title compounds undergo hydrogen abstraction from the solvent via a π,π* excited singlet state as well as skeletal rearrangement via a π,R(3s) Rydberg excited state.
ANTHRACYCLINES. CYCLOADDITIONS OF 9-CHLORO-10-HYDROXY-1,4-ANTHRAQUINONE WITH VARIOUS BUTA-1,3-DIENES
Authors: Agarwal Nand L , Scheeren Hans W 
Published: July 2006

Abstract
The Diels–Alder type cycloaddition of several substituted buta-1,3-dienes with 9-chloro-10-hydroxy-1,4-anthraquinone (10) affords an efficient, regiospecific access in two steps to tetracyclic ketones (12–14) which have been investigated as intermediates for the synthesis of anthracycline derivatives. Butadienes with a less asymmetric II-electron distribution than 9 give lower regiospecificity in cycloadditions with 10. Depending on the substituents in the used butadiene, the obtained cycloadducts are transformed under the reaction circumstances into the aromatized products (15–20).
A NEW METHOD FOR REGIOSELECTIVE α-MONO- OR α,α-DI-DEUTERATION OF CARBONYL COMPOUNDS
Authors: Ono Noboru , Hamamoto Isami , Miyake Hideyoshi , Kaji Aritsune 
Published: July 2006

Abstract
Mono- or di-deuterated carbonyl compounds are prepared regioselectively by the base-catalyzed H–D exchange of α-hydrogen of aliphatic nitro compounds and the subsequent replacement of the nitro group by H or D with Bu3SnX (X = H, D).
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

Abstract
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

Abstract
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

Abstract
(±)-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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.