bluuebunny/crossref_metadata_2025_split huggingface dataset:
PYROLYSIS OF 2-ALLYLOXYTROPONES: A NEW ELIMINATION REACTION TO TERMINAL DIENES
Authors: Takeshita Hitoshi , Mametsuka Hiroaki , Uchida Kingo 
Published: July 2006

Abstract
By pyrolysis over 140°C, several 2-alkenyloxytropones gave terminal dienes and regenerated tropolones. The elimination proceeded in the electrocyclic 6π+2σ+2σ-mode on the Claisen intermediates. This was applied to a synthesis of thujopsadiene.
HYDRCPHOBIC INTERACTION BETWEEN TRIS(1,10-PHENANTHROLINE)-METAL(II) ION AND HEXANESULFONATE ION IN AQUEOUS SOLUTION
Authors: Masuda Yuichi , Tachiyashiki Satoshi , Yamatera Hideo 
Published: July 2006

Abstract
The structure of the ion pair of [M(phen)3]2+ and the hexanesulfonate ion was investigated by 13C NMR techniques. The importance of hydrophobic interaction was suggested.
EFFICIENT PHOTOELECTROCHEMICAL CONVERSION OF SOLAR ENERGY WITH n-TYPE SILICON SEMICONDUCTOR ELECTRODES SURFACE-DOPED WITH IIIA-GROUP ELEMENTS
Authors: Nakato Yoshihiro , Tsumura Akira , Tsubomura Hiroshi 
Published: July 2006

Abstract
The stability of an n-type silicon (n-Si) electrode was remarkably improved by the doping in a thin surface layer with boron, aluminium or indium. Photoelectrochemical cells having an n-Si electrode surface-doped with boron and coated with a small amount of platinum or palladium converted light energy into either electricity or chemical energy via decomposition of hydrogen iodide into hydrogen and iodine without external bias with an outstanding high efficiency.
ASYMMETRIC SYNTHESIS BY MODIFIED RANEY NICKEL POWDER ELECTRODES
Authors: Fujihira Masamichi , Yokozawa Akira , Kinoshita Hideo , Osa Tetsuo 
Published: July 2006

Abstract
A new enantioselective electrochemical hydrogenation of achiral ketones by Raney nickel powder electrodes modified with optically active tartaric acids is described. 2-Hexanone was reduced to 2-hexanol at ca.−1.0 V vs. SCE in a high current efficiency of more than 67%. The reduction on the unmodified Raney nickel powder electrodes gave alcohol with no optical rotation, whereas on the modified powders with (R,R)-(+)-tartaric acid, the optical purity between 2–6% (av. 4%) for (S)-(+)-2-hexanol was obtained. When Raney nickel was modified with (S,S)-(−)-tartaric acid, the enantiomer, (R)-(−)-2-hexanol, was formed with almost the same optical purity. The similar results were obtained for the reduction of 2-heptanone and 2-octanone.
CD SPECTRA OF DEUTEROHEMIN DERIVATIVES WITH ONE OR TWO IMIDAZOLE(S) COVALENTLY BOUND TO THE PORPHYRIN RING
Authors: Okuyama Kazuo , Murakami Tasuku , Nozawa Tsunenori , Hatano Masahiro 
Published: July 2006

Abstract
Origins of the Soret optical activity were investigated by CD spectra of the compound described in the title. The chelation of the axial ligand group(s) was demonstrated to be an important factor for the large optical activity observed on the Soret region which was critically dependent on the spin state of the heme iron.
THE REACTIONS OF BENZYLIDENEMALONONITRILES AND β-NITROSTYRENES WITH O-PHENYLENEDIAMINE INCLUDING THE NEW ORGANIC REDOX REACTIONS BETWEEN THE OLEFINS AND 2-PHENYLBENZIMIDAZOLINES
Authors: Itoh Kazuyoshi , Ishida Hideaki , Chikashita Hidenori 
Published: July 2006

Abstract
The reactions of benzylidenemalononitriles and β-nitrostyrenes with o-phenylenediamine in ethanol at boiling temperature gave the reduced products of the olefins. The reactions were rationalized on the basis of the role of 2-phenylbenzimidazolines as a hydrogen donor.
REGIOSELECTIVE POLYPRENYL REARRANGEMENT OF POLYPRENYL 2,3,4,5-TETRASUBSTITUTED PHENYL ETHERS PROMOTED BY BORON TRIFLUORIDE
Authors: Yoshizawa Toyokichi , Toyofuku Hatsunori , Tachibana Koichi , Kuroda Toshio 
Published: July 2006

Abstract
4-Acetoxy-6-polyprenyl-2,3,5-trimethylphenols or 2,3-dimethoxy-5-methyl-6-polyprenylhydroquinones were obtained selectively by the BF3·OEt2 catalyzed polyprenyl rearrangement of polyprenyl 4-acetoxy-2,3,5-trimethylphenyl ethers or polyprenyl 2,3-dimethoxy-4-hydroxy-5-methylphenyl ethers.
ON THE EFFECT OF THE TORSIONAL BARRIER IN TORSION-ROTATION-VIBRATION SPECTRA OF DIMETHYLACETYLENE-D3
Authors: Nakagawa Jun , Hayashi Michiro 
Published: July 2006

Abstract
Infrared specta of gaseous CH3C≡CCD3 were measured. With the aid of simulation spectra, torsional barrier in this molecule was evaluated to be 2±1 and 6±2 cm−1 from ν9 (CH3 degenerate stretching) and ν10 (CH3 degenerate deformation) perpenducular bands, respectively. The dependence of the barrier height on the vibrational state was found.
FUNCTIONALIZED CYCLOPENTANE DERIVATIVES FROM THE PHOTOADDUCTS OF METHYL 2,4-DIOXOPENTANOATE-OLEFINS: ALTERNATIVE SYNTHESES OF dl-DEHYDROIRIDODIAL AND dl-CHRYSOMELIDIAL
Authors: Takeshita Hitoshi , Hatsui Toshihide , Kato Nobuo , Masuda Takeshi , Tagoshi Hirotaka 
Published: July 2006

Abstract
Functionalized cyclopentane derivatives were prepared by the retro-ozonolys of methyl 2,6-dioxoheptanoates, which are readily accessible from the photocycloaddition of methyl 2,4-dioxopentanoate with olefins. By this method, 3-isopropenyl-2-methoxycarbonyl-1-methylcyclopentene, a versatile intermediate to iridoid terpenoids, and 1-methoxycarbonyl-2,6,6-trimethylfulvene were synthesized from isoprene. Alternative syntheses of dl-dehydroiridodial and dl-chrysomelidial were accomplished.
ELUCIDATION OF REACTION BETWEEN POLYESTERS WITH MAGNESIUM OXIDE BY TITMETRIC METHOD AND FT-IR
Authors: Nomura Hitoshi , Takayama Yuzi 
Published: July 2006

Abstract
Studies on the states of MgO added into the carboxylic group terminated polyester resins were performed to clarify a mechanism of thickening. Contrary to some literatures, it was confirmed that the MgO was used to form the neutral salt of the polyesters and there was little tendency for the MgO to exist in the form of the basic salt in the system.
PREPARATION OF DIORGANOTHALLIUM(III) COMPLEXES WITH AN ‘N6’ MACROCYCLIC LIGAND AND THEIR 1H AND 13C NMR SPECTRA
Authors: Kawasaki Yoshikane , Okuda Naoki 
Published: July 2006

Abstract
Diorganothallium(III) complexes with an ‘N6’ macrocyclic ligand were prepared by using Schiff base condensation of 2,6-diacetylpyridine with ethylenediamine. 13C NMR signals of the ligand carbons were split by spin–spin coupling with the thallium nucleus. The dimethylthallium(III) complex shows the largest 1J(Tl-CH3) and 2J(Tl-CH3) values among dimethylthallium(III) compounds.
CATALYTIC PERFORMANCE OF EGG WHITE TYPE Pt/Al2O3 CATALYST IN THE OXIDATION OF C3H8 AND CO
Authors: Kunimori Kimio , Nakajima Ikuo , Uchijima Toshio 
Published: July 2006

Abstract
The egg white type Pt/Al2O3 catalyst, without any Pt on the exterior surface, was prepared, and the catalytic activities of C3H8 oxidation and CO oxidation were compared with conventional egg shell and uniform type catalysts. For the CO oxidation, it was confirmed experimentally that the egg white type catalyst was more active than the egg shell type at a certain condition.
THE STEREOSELECTIVE SYNTHESIS OF l-TAGATOSE—AN APPLICATION OF Zn(II) MEDIATED HIGHLY STEREOSELECTIVE ADDITION OF 2-FURYLLITHIUM TO POLYOXYGENATED ALDEHYDE—
Authors: Mukaiyama Teruaki , Yuki Yoichi , Suzuki Keisuke 
Published: July 2006

Abstract
In the presence of ZnBr2, the addition of 2-furyllithium to 4-O-benzyl-2,3-O-isopropylidene-l-threose proceeded in a highly stereoselective manner to afford the anti-adduct, which was further converted to l-tagatose.
ELECTRON SPIN RESONANCE OF MANGANESE(II) ION IN RAW LEAVES
Authors: Ogata Tateaki , Murakami Akishige , Fujisawa Tadashi , Kamada Hitoshi 
Published: July 2006

Abstract
Electron spin resonance spectra of manganese(II) ion in some leaves were measured. Spectral pattern of manganese(II) ion in raw leaves was found to be very similar to that of manganese(II) ion in aqueous solutions containing polysaccharides and amino acids.
CATALYTIC ENANTIOTOPOS DIFFERENTIATING DEHYDROGENATION OF PROCHIRAL DIOLS USING RUTHENIUM COMPLEX WITH DIOP
Authors: Ishii Youichi , Osakada Kohtaro , Ikariya Takao , Saburi Masahiko , Yoshikawa Sadao 
Published: July 2006

Abstract
Optically active δ- and γ-lactones are obtained by the homogeneous catalytic dehydrogenation of prochiral diols using Ru2Cl4((−)-DIOP)3 in the presence of benzalacetone as a hydrogen acceptor and triethylamine.
SYNTHESIS OF A TRIFURCATED TETRASACCHARIDE USING DEHYDRATIVE GLYCOSYLATION
Authors: Morishima Naohiko , Koto Shinkiti , Uchino Masaharu , Zen Shonosuke 
Published: July 2006

Abstract
2,6-Di-O-(β-d-glucopyranosyl)-4-O-(α-l-rhamnopyranosyl)-d-glucopyranose was synthesized through three successive glycosylations with the benzyl-protected glycoses starting from the glycosyl acceptor, benzyl 4-O-allyl-6-O-benzoyl-3-O-benzyl-α-d-glucopyranoside.
THE FIRST APPLICATION OF ANION-CATALYZED PHASE-TRANSFER CATALYSIS TO FRIEDEL-CRAFTS ALKYLATION
Authors: Kobayashi Hiroshi , Sonoda Takaaki , Iwamoto Hidetoshi 
Published: July 2006

Abstract
Friedel–Crafts alkylation proceeded by catalysis of tetrakis[3,5-di(F-methyl)phenyl]borate (TFPB) in a dichloromethane-aqueous sulfuric acid two-phase system. Kinetic evidence indicated that oxonium-TFPB ion-pair in the organic phase was operative as a catalyst.
UNSYMMETRICAL COUPLING OF 2-ARYLTHIOPHENES BY CATION EXCHANGE RESIN
Authors: Sone Tyo , Kubo Masaaki , Kanno Tsutomu 
Published: July 2006

Abstract
2-Arylthiophenes coupled through the 4-,5′-positions of the two thiophene rings by the action of cation exchange resin to afford unsymmetrical 5,5′-diary1-2,3′-bithienyls as principal products.
DIRECT SYNTHESIS OF PROTECTED THIOLS BY TRIBUTYLSTANNYL GROUP
Authors: Ueno Yoshio , Nozomi Mamoru , Okawara Makoto 
Published: July 2006

Abstract
Organic thiocyanates react with tributyltin hydride under homolytic conditions to give thiostannanes (Bu3Sn–SR), which are air-stable and high boiling protected forms of the parent thiols.
COMPOSITION OF “POLYPHOSPHORIC ACID TRIMETHYLSILYL ESTER (PPSE)” AND ITS USE AS A CONDENSATION REAGENT
Authors: Yamamoto Keiji , Watanabe Hiroyuki 
Published: July 2006

Abstract
Phosphorus pentoxide reacts readily with anhydrous hexamethyldisiloxane (HMDSO) to form mixtures of tetraphosphoric acid trimethylsilyl esters (so-called PPSE), the composition of which being estimated from 31P NMR data. PPSE was conveniently used as a condensation reagent for the syntheses of benzimidazoles, indoles, and isoquinoline derivatives. Heterogenized PPSE by using silica gel instead of HMDSO was found to be equally useful.
DYNAMIC NMR STUDY ON RATES OF DISSOCIATION OF AN AMINE LIGAND IN AN ORGANOMETALLIC COMPOUND
Authors: Oki Michinori , Ohira Manabu 
Published: July 2006

Abstract
Rates of topomerization of 2-(N,N-diethylaminomethyl)phenyldimethyltin bromide were obtained at various temperatures by simulating the 1H NMR spectra. The data afforded the following activation parameters: ΔH\eweq 23.4±1.1 kcal/mol, ΔS\eweq 31.0±3.8 e.u., ΔG273\eweq 15.0 kcal/mol. Application of this technique to general problems of ligand dissociation in organometallic chemistry is discussed.
A STEREOSELECTIVE SYNTHESIS OF 2-AMINO-2-DEOXY-d-RIBOSE
Authors: Murakami Masahiro , Mukaiyama Teruaki 
Published: July 2006

Abstract
2-Benzyloxycarbonylamino-2-deoxy-d-ribose was conveniently synthesized via α-chloro-β-hydroxyester prepared from 2,3-O-isopropylidene-d-glyceraldehyde and ethoxyacetylene by the stereoselective aldol reaction.
REGIOSELECTIVE 1,5-ENYNE SYNTHESIS FROM ORGANOBORANES
Authors: Hara Shoji , Satoh Yoshitaka , Suzuki Akira 
Published: July 2006

Abstract
2-Alkynylboranes prepared from 2-propynyl chloride and trialkylboranes react readily with allylic halides in the presence of cuprous iodide to give 1,5-enynes regioselectively.
A NOVEL METHOD FOR THE SYNTHESIS OF α,β-DIHYDROXY KETONES via TIN(II) ENEDIOLATES
Authors: Mukaiyama Teruaki , Kato Jun-ichi , Yamaguchi Masahiko 
Published: July 2006

Abstract
Activated metallic tin, prepared from stannous chloride and metallic potassium, reacts readily with α-dicarbonyl compounds to form tin(II) enediolates, which in turn react with aldehydes under a mild reaction condition to give α,β-dihydroxy ketones in good yields. The reaction proceeds stereoselectively in the presence of hexafluorobenzene.
A NEW TERNARY PHASE Zn2Ti18S32
Authors: Saeki Masanobu , Onoda Mitsuko 
Published: July 2006

Abstract
New phase was found in composition of Zn2Ti18S32. It was prepared from Ti metal, zinc sulfide and titanium sulfide at 1200°C. The structure was of cubic cell with lattice constant of a = 9.843 Å.
A NOVEL BEHAVIOR OF ELECTRICAL RESISTIVITY IN A NEW TWO-DIMENSIONAL ORGANIC METAL, (BEDT-TTF)2ClO4(1,1,2-TRICHLOROETHANE)0.5
Authors: Saito Gunzi , Enoki Toshiaki , Inokuchi Hiroo 
Published: July 2006

Abstract
An unusual temperature dependence of the resistivity along the least conductive axis of a new two-dimensional organic metal, (BEDT-TTF)2ClO4(1,1,2-trichloroethane)0.5, is presented and discussed in terms of the crystal structure.
FUNCTIONALIZATION OF UNACTIVATED CARBON INVOLVING PHOTOCHEMICAL INTRAMOLECULAR REARRANGEMENT OF NITRO GROUP ATTACHED TO TETRAHEDRAL CARBON TO NITROSOOXY GROUP
Authors: Suginome Hiroshi , Takakuwa Kyohei , Orito Kazuhiko 
Published: July 2006

Abstract
Photolysis of both 6β-nitrocholest-4-ene and 4β-nitrocholest-6-ene gave a mixture of (E)-19-hydroxyiminocholest-4-en-6β-ol and (E)-19-hydroxyiminocholest-5-en-4β-ol; this mixture arose in both cases from a photochemical nitro-nitrosooxy rearrangement followed by the Barton reaction. The structures of the products were established by their synthesis.
SYNTHESES AND PROPERTIES OF BENZANNELATED DIPHENYLPENTADECAFULVENE DERIVATIVES
Authors: Ojima Juro , Kurom Shigeyasu , Kirita Mitsuru 
Published: July 2006

Abstract
Synthesis of 10-methyl-16,16-diphenyl-4,5-benzo-6,8-bisdehydro-4, 12-methyl-16,16-diphenyl-6,7-benzo-8,10-bisdehydro- 5, and 16,16-diphenyl-4,5:10,ll-dibenzo-6,8-bisdehydropentadecafulvene 6 has been described. Comparison of 1H-NMR spectra of these benzannelated fulvenes 4–6 with that of nonbenzannelated fulvene 3 reveals that 5,10-dimethyl-16,16-diphenyl-6,8-bisdehydropentadecafulvene 3 is atropic.
THE EPOXIDATION OF OLEFINS WITH HYDROGEN PEROXIDE ON MOLYBDENUM BLUE-CHARCOAL CATALYSTS
Authors: Inoue Masami , Itoi Yasushi , Enomotot Saburo , Watanabe Yoshihiro 
Published: July 2006

Abstract
The epoxidation of olefins was examined with aqueous hydrogen peroxide in the presence of molybdic acid-charcoal catalysts. On a molybdenum blue-charcoal catalyst, cyclohexene was oxidized to cyclohexene oxide in a good yield. Alkyltin compounds such as trimethyltin and tri-n-butyltin chloride cocatalyzed the epoxidation to give cyclohexene oxide in a 67% yield at 50°C for a 12 h reaction. The catalysts were recovered and reused.
RHODIUM(I)-CATALYZED REACTION OF 2-PROPENYL CHLOROACETATE. FORMAL ELIMINATION OF ALLENE AND INSERTION INTO THE C–O BOND OF THE ESTER FUNCTION
Authors: Miyano Sotaro , Mori Atsuo , Kato Katsumi , Kawashima Yasuhiko , Hashimoto Harukichi 
Published: July 2006

Abstract
Treatment of 2-propenyl chloroacetate with catalytic amount of RhCl(PPh3)3 in boiling tetrahydrofuran gave 2-methylene-4-pentenyl chloroacetate, a product which is derived via a formal insertion of allene unit into the C–O bond of the starting chloroacetate, with concomitant formation of chloroacetic acid.
PINNATERPENES A, B, AND C, NEW DIBROMODITERPENES FROM THE RED ALGA LAURENCIA PINNATA YAMADA
Authors: Fukuzawa Akio , Kumagai Yoshikazu , Masamune Tadashi , Furusaki Akio , Matsumoto Takeshi , Katayama Chuji 
Published: July 2006

Abstract
The structures of three dibromoditerpenes, isolated from the title alga and designated as pinnaterpenes A, B, and C, were determined on the basis of the X-ray crystallography as well as the chemical and spectral data.
X-RAY STRUCTURE ANALYSIS OF NEODYMIUM NITRATE COMPLEX WITH TRIETHYLENE GLYCOL
Authors: Hirashima Yoshiyuki , Tsutsui Toshiyuki , Shiokawa Jiro 
Published: July 2006

Abstract
Neodymium atom is decacoordinated with oxygen atoms in the title complex, where triethylene glycol forms a ring-like structure with a bidentate nitrate. The distances between a neodymium atom and the coordinated oxygen atoms are somewhat shorter than those in the complexes with tetraethylene glycol and pentaethylene glycol.
PICRASINOSIDE-A, A NOVEL QUASSINOID GLUCOSIDE FROM PICRASMA AILANTHOIDES PLANCHON
Authors: Okano Masayoshi , Fukamiya Narihiko , Kondo Katsuhiko , Fujita Tomoyuki , Aratani Takaaki 
Published: July 2006

Abstract
A novel quassinoid glucoside picrasinoside-A was isolated from Pierasma ailanthoides PLANCHON and the structure was established from spectral data, chemical transformations into picrasin B and quassin, and enzyme hydrolysis. The aglycon picrasin B showed a significant clastogenic activity in cell cultures of Don lung cells of Chinese hamster.
SELECTIVE SYNTHESIS OF 3,5-DISUBSTITUTED ISOXAZOLES FROM β-SUBSTITUTED ENONES AND HYDROXYLAMINE HYDROCHLORIDE IN THE PRESENCE OF VARIOUS BASES
Authors: Kashima Choji , Yoshiwara Nobutoshi , Shirai Shun-ichi , Omote Yoshimori 
Published: July 2006

Abstract
The synthesis of two isomeric isoxazoles could be selectively controlled in the reaction of β-substituted enones with 3 species of hydroxylamine; hydroxyammonium cation (1), free hydroxylamine (2) and aminohydroxy anion (3).
SYNTHESES AND PROPERTIES OF (Z)-1-ARYL-2-TROPYLIOETHENE PERCHLORATES
Authors: Mizumoto Kiyoharu , Oda Masaji 
Published: July 2006

Abstract
(Z)-1-Phenyl- and (Z)-1(1-naphthyl)-2-tropylioethene perchlorate are isolated and characterized. The ions readily isomerize to the E-isomers in acetonitrile at room temperature, but are remakably stable in trifluoroacetic acid to show a marked solvent effect. Light also induces the Z→E isomerization.
IONIC ASSOCIATION ON A POLYOXYETHYLENE CHAIN
Authors: Awano Hiroshi , Ono Katsumichi , Murakami Kenkichi 
Published: July 2006

Abstract
The equivalent conductivities, Λ, of potassium and sodium thiocyanate in ethanol and nitromethane solutions containing polyoxyethylene (POE) have been measured as a function of POE concentration, Cp, at 298.15 K. The Λ vs. Cp curves have peculiar features. These features have been explained in terms of the cooperative association of cation and anion on a POE chain.
THE STRUCTURE OF BIS(ISOPROPYLTHIOACETATO)TRIS(ISOQUINOLINE)COPPER(II)—POTENTIALLY HEPTACOORDINATED COMPLEX
Authors: Sato Yoshiyuki , Ouchi Akira , Yukawa Yasuhiko , Takeuchi Toshio 
Published: July 2006

Abstract
The crystal and molecular structure of the title complex has been determined by the X-ray diffraction. The copper(II) atom is in a distorted pentagonal bipyramidal geometry, including two oxygen atoms of the both carboxylates from a little long distances. Sulfur atoms of the ligands do not coordinate to the central metal atom.
NEW TYPE OF PREFABRICATED FULLY PROTECTED RIBONUCLEOTIDE MONOMER UNITS AS USEFUL SYNTHETIC INTERMEDIATES IN RAPID OLIGORIBONUCLEOTIDE SYNTHESIS
Authors: Honda Sinkichi , Terada Kazunori , Sato Yoshinobu , Sekine Mitsuo , Hata Tsujiaki 
Published: July 2006

Abstract
Oligoribonucleotide synthesis has been done by employing newly constructed fully protected ribonucleotide units, S,S-diphenyl 5′-O-dimethoxytrityl-2′-O-tetrahydropyranyl-N-monomethoxytritylnucleoside 3′-phosphorodithioates 7. The units were found to be useful synthetic intermediates for rapid oligoribonucleotide synthesis.
TRISDEHYDRO[16]ANNULENO[18]ANNULENE
Authors: Iyoda Masahiko , Yoshikawa Yukihiro , Nakagawa Masazumi 
Published: July 2006

Abstract
Trisdehydro[16]annuleno[18]annulene has been synthesized. A strong paratropicity was observed in the [16]annulene moiety. The observed diatropicity of the 18π moiety indicates that the 1H NMR behavior of the annulenoannulene can be regarded as a superposition of the nature of individual rings and the peripheral 4nπ-system.
NEW SYNTHESIS OF γ-KETO ACIDS FROM NITROOLEFINS AND CARBOXYLIC ACID DIANIONS
Authors: Miyashita Masaaki , Yamaguchi Ryuji , Yoshikoshi Akira 
Published: July 2006

Abstract
As a convenient synthetic method of γ-keto acids, oxoalkylation of carboxylic acids with nitroolefins was examined. Carboxylic acid dianions reacted with conjugated nitroolefins at low temperature (−100°C) and a variety of γ-keto acids were obtained on acidic workup in moderate to good yields.
VIBRATION-ROTATION INFRARED SPECTRUM OF ν6 OF ACETONITRILE. FERMI AND CORIOLIS RESONANCES WITH ν7+ν8 AND ν3
Authors: Matsuura Hiroatsu , Kubota Noboru , Murata Hiromu 
Published: July 2006

Abstract
Vibration-rotation infrared spectrum of ν6 of acetonitrile was measured with a resolution of 0.08 cm−1. The spectrum was heavily perturbed by a Fermi resonance with ν7+ν8 and a Coriolis resonance with ν3. The analysis gave values, more precise than before, of the parameters for these states along with the interaction parameters.
OPTICALLY ACTIVE DI(PERFLUORO-2-PROPOXYPROPIONYL)METHANE: A NOVEL LEGAND FOR NMR SHIFT REAGENT
Authors: Kawa Hajimu , Yamaguchi Fumihiko , Ishikawa Nobuo 
Published: July 2006

Abstract
(+)-Di(perfluoro-2-propoxypropionyl)methane, (+)-4, an optically active β-diketone, was prepared in a good yield from (+)-perfluoro-2-propoxypropionic acid. The europium chelate of (+)-4 was found to be a very effective and useful NMR shift reagent for the direct determination of the enantiomeric composition of chiral compounds.
NEW METHOD FOR THE SYNTHESIS OF DEHYDROTRIPEPTIDES, USING N-CARBOXY α-DEHYDROAMINO ACID ANHYDRIDE AS SYNTHON
Authors: Yonezawa Yasuchika , Yamada Toyofumi , Shin Chung-gi 
Published: July 2006

Abstract
Various dehydrotripeptides, containing one or two α-dehydroamino acid residues, were readily synthesized by using N-carboxy α-dehydroamino acid anhydride as synthon of dehydropeptide unit.
A STABLE 1,2-DIAZOCINE SYSTEM: 3,8-DIPHENYL-l,2-DIAZACYCLOOCTA-2,4,6,8-TETRAENES
Authors: Yogi Seiichi , Hokama Kozo , Tsuge Otohiko 
Published: July 2006

Abstract
Stable 1,2-diazocines, 3,8-diphenyl-1,2-diazacycloocta-2,4,6,8-tetraenes, were prepared via halogenation-dehydrohalogenation sequences starting from readily available 3,8-diphenyl-1,2-diazacycloocta-2,8-diene. Thermolysis and photolysis of the 1,2-diazocines are also described.
A NEW MARINE CAROTENOID, MYTILOXANTHINONE FROM THE SEA SQUIRT, HALOCYNTHIA RORETZI
Authors: Matsuno Takao , Ookubo Masahiro 
Published: July 2006

Abstract
A new marine carotenoid, mytiloxanthinone (3,8′-dihydroxy-7,8-didehydro-β,κ-carotene-3′,6′-dione) has been isolated from sea squirt, Halocynthia roretzi.
ISOLATION AND CHARACTERIZATION OF STABLE ROTATIONAL ISOMERS ABOUTA TETRAHEDRAL NITROGEN-TO-TETRAHEDRAL CARBON SINGLE BOND IN 2,3-DIMETHYL-9-(N,N-DIMETHYLAMINO)TRIPTYCENE N-OXIDE
Authors: Nakamura Nobuo 
Published: July 2006

Abstract
Oxidation of 2,3-dimethyl-9-(N,N-dimethylamino)triptycene with mCPBA followed by chromatography on alumina afforded two stable rotamers about a C–N single bond, whose assignment was consistently carried out on the basis of their 1H- and 13C-NMR, along with those of the model compound, 9-(N,N-dimethylamino)triptycene N-oxide.
TRICHOLIDIC ACID, A NEW TRITERPENE LACTONIC ACID FROM TRICHOLOMA SPECIES
Authors: Nozoe Shigeo , Takahashi Akira , Kusano Genjiro , Itai Akiko , Iitaka Yoichi 
Published: July 2006

Abstract
The structure of tricholidic acid, a new lanostane-type triterpene lactonic acid isolated from a toxic mushroom of Tricholoma species has been established by spectroscopic, chemical, and X-ray crystallographic analyses.
AN IMPROVED PROCEDURE FOR EFFICIENT GENERATION OF METHYL(OR p-TOLYL)THIOMETHYL GRIGNARD REAGENT AND ITS USE IN ORGANIC SYNTHESES
Authors: Ogura Katsuyuki , Fujita Makoto , Takahashi Kazumasa , Iida Hirotada 
Published: July 2006

Abstract
The optimal conditions for transformation of a chloromethyl sulfide into the corresponding Grignard reagent (2) in a high yield are established and (2) is shown to react with various functional groups such as an alkyl halide, an aldehyde, and a sulfinic ester, revealing its usefulness in organic syntheses.