bluuebunny/crossref_metadata_2025 huggingface dataset:
VINYL MIGRATION IN THE OXYTHALLATION OF SOME 1,3-DIENES
Authors: Murakami Masashi , Nishida Shinya
Published: July 2006

The oxythallation of certain 1,3-dienes with thallium(III) nitrate trihydrate in MeOH–CH2Cl2 at 0–20 °C gave products after vinyl migration. Methyl 1-methylcyclopropyl ketone, obtained in the reaction of 2,3-dimethyl-1,3-butadiene, was presumably derived from a cyclopropylmethyl cation, an intermediate in the vinyl migration.
CALCULATION OF NEW INDUCTIVE SUBSTITUENT PARAMETER (τ) FOR GROUP AND THE APPLICATION
Authors: Inamoto Naoki , Masuda Shozo
Published: July 2006

The τ values for more than 150 substituents were calculated from group electronegativities obtained by revised method, being in agreement with those obtained from ionicity and bond moment, and were applied to σ-electron densities of XC6H4+, Cα-SCS of RCH2X, JHHtrans of vinyl compounds, and various σ values for electron-withdrawing substituents.
ACTIVE CARBON-SUPPORTED ALUMINIUM COPPER CHLORIDE AS WATER-RESISTANT CARBON MONOXIDE ADSORBENT
Authors: Hirai Hidefumi , Komiyama Makoto , Wada Keiichiro
Published: July 2006

A solid adsorbent of carbon monoxide, aluminium copper(I) chloride supported on active carbon, is prepared from copper(I) chloride, aluminium chloride, and active carbon. The adsorbent is stable against water and is applicable to separation of carbon monoxide from gas mixture containing water.
DEHYDRATIVE α-GLUCOSYLATION USING A MIXTURE OF p-NITROBENZENESULFONYL CHLORIDE, SILVER TRIFLUOROMETHANESULFONATE, N,N-DIMETHYLACETAMIDE, AND TRIETHYLAMINE
Authors: Morishima Naohiko , Koto Shinkiti , Zen Shonosuke
Published: July 2006

Stereoselective synthesis of α-linked di- and trisaccharides is performed by the one-stage glucosylation using 2,3,4,6-tetra-O-benzyl-α-d-glucopyranose and a mixture of p-nitrobenzenesulfonyl chloride, silver trifluoromethanesulfonate, N,N-dimethylacetamide, and triethylamine in dichloromethane.
THE PLATINUM COMPLEX CATALYZED REDUCTIVE CARBONYLATION OF NITROARENE TO URETHANE
Authors: Watanabe Yoshihisa , Tsuji Yasushi , Suzuki Naoki
Published: July 2006

The reductive carbonylation of nitrobenzene to a urethane(ethylphenylcarbamate) is catalyzed by platinum(II)–tin(IV) systems. The catalytic activities are drastically enhanced by addition of a tertiary amine.
NEW CLERODANE DITERPENOIDS FROM AJUGA IVA (LABIATAE)
Authors: Camps Francisco , Coll José , Cortel Adolfo
Published: July 2006

Four new clerodane diterpenoids, Ivains I–IV (1–4), have been isolated from Ajuga iva, and their structures have been elucidated by spectral methods and confirmed by the X-ray diffraction analysis of 2-oxo-Ivain I (7).
PYROLYSIS OF 2-ALLYLOXYTROPONES: A NEW ELIMINATION REACTION TO TERMINAL DIENES
Authors: Takeshita Hitoshi , Mametsuka Hiroaki , Uchida Kingo
Published: July 2006

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
THE REACTIONS OF NITRILE IMINES WITH AMINO- AND OXO- SUBSTITUTED AZOLES
Authors: Elfahham Hassan A , Sadek Kamal U , Elgemeie Galal E H , Elnagdi Mohamed H
Published: July 2006

The behavior of several amino and hydroxy azoles toward nitrile imines and hydrazonyl halides is reported.
UNSYMMETRICAL COUPLING OF 2-ARYLTHIOPHENES BY CATION EXCHANGE RESIN
Authors: Sone Tyo , Kubo Masaaki , Kanno Tsutomu
Published: July 2006

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

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.
EFFECT OF SIDEARM OF 15-CROWN-5 ON Na+/K+ SELECTIVITY
Authors: Nakatsuji Yohji , Nakamura Tetsuya , Okahara Mitsuo
Published: July 2006

Certain host molecules having electrondonating sidearm derived from 15-crown-5 were found to display excellent Na+/K+ selectivity.
COMPOSITION OF “POLYPHOSPHORIC ACID TRIMETHYLSILYL ESTER (PPSE)” AND ITS USE AS A CONDENSATION REAGENT
Authors: Yamamoto Keiji , Watanabe Hiroyuki
Published: July 2006

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.
SYNTHESIS OF METHYL α-TRIOXACARCINOSIDE B
Authors: Suami Tetsuo , Nakamura Katsumi , Hara Tamio
Published: July 2006

The synthesis of methyl glycoside of trioxacarcinose B, one of the carbohydrate components of antitumor antibiotic trioxacarcin A, is described.
DYNAMIC NMR STUDY ON RATES OF DISSOCIATION OF AN AMINE LIGAND IN AN ORGANOMETALLIC COMPOUND
Authors: Oki Michinori , Ohira Manabu
Published: July 2006

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

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

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

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

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

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

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

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

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

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

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

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

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

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

(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

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

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

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

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

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

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

(+)-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

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

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

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

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

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

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.
SELECTIVE REACTIONS OF THIOLATE ANIONS WITH 4-HYDROXY-E-2-ALKENOIC ESTERS OR 4-METHANESULFONYLOXY-E-2-ALKENOIC ESTERS. SYNTHESIS OF 2-ALKEN-4-OLIDES (Δα,β-BUTENOLIDES) AND E,E-2,4-ALKADIENOIC ESTERS
Authors: Tanikaga Rikuhei , Nozaki Yoshihito , Tanaka Kazuhiko , Kaji Aritsune
Published: July 2006

Methyl 4-hydroxy-E-2-alkenoates prepared from aldehydes in one step, undergo the Michael reactions with thiolate anions to give 4-alkanolide derivatives, which are converted into 2-alken-4-olides. Methyl 4-methanesulfonyloxy-E-2-alkenoates undergo the substitution reactions, and subsequent treatments give methyl E,E-2,4-alkadienoates.
SYNTHESIS OF TRISUBSTITUTED 4H-1,2,4-OXADIAZINES
Authors: Zen Shonosuke , Harada Kazuho
Published: July 2006

The derivatives of 4H-1,2,4-oxadiazine, a new class of six-membered heterocycles, were synthesized through the reactions of β-diketones with aliphatic nitro compounds and acetyl chloride, and also of azirines with nitrile oxides. A reaction mechanism is proposed.
PERMEABILITY OF LARGE POLYAMIDE MICROCAPSULE COATED WITH SYNTHETIC BILAYER MEMBRANE
Authors: Okahata Yoshio , Hachiya Satoshi , Nakamura Gen-ichi
Published: July 2006

Polyamide ultrathin capsules coated with the bilayer membrane of dialkyl amphiphiles were prepared. Permeation of NaCl from the inner aqueous phase of the coated capsules was reduced 30–50 times relative to that of the uncoated semipermeable capsule, and drastically changed near the phase transition temperature of the coating bilayer membrane.
SYNTHESIS OF A COMMON STRUCTURAL UNIT OF THE ANTIBIOTIC OLIGOSTATINS
Authors: Ogawa Seiichiro , Iwasawa Yoshikazu , Toyokuni Tatsushi , Suami Tetsuo
Published: July 2006

Methyl N-[(1S)-(1,2,4/3,5,6)-2,3,4,6-tetrahydroxy-5-(hydroxymethyl)cyclohexyl]-4-amino-4,6-dideoxy-α-d-glucopyranoside, a common structural unit of the antibiotic oligostatins, has been synthesized and characterized as the heptaacetate.
SELECTIVE N-MONOALKYLATION OF ANILINE OVER ALKALI CATION EXCHANGED X AND Y TYPE ZEOLITES
Authors: Onaka Makoto , Ishikawa Koji , Izumi Yusuke
Published: July 2006

Potassium cation exchanged X and Y type zeolites are found to work as efficient bases in N-alkylation of aniline with an alkylating reagent in benzene. The intrinsic pore structures of X and Y zeolites are responsible for the high selectivity in N-monoalkylation of aniline.
CARBON–CARBON BOND FORMING REACTION ASSISTED BY SILICON TRANSFER. THE REACTION BETWEEN NITRONES AND KETENE SILYL ACETALS
Authors: Tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

Nitrones reacted with ketene silyl acetals at room temperature to afford β-siloxyamino esters in high yields. The stereochemistry of the products was assigned on the basis of NMR spectral data. A mechanism involving initial silicon transfer from ketene silyl acetals to nitrones has been proposed.
PREPARATION OF N-THIOAMIDO-β-LACTAM AND 2-THIOHEXAHYDROPYRIMIDIN-4-ONE DERIVATIVES FROM N-MONOSUBSTITUTED THIOUREAS AND β-HALOACYL HALIDES
Authors: Okawara Tadashi , Nakayama Kentaro , Furukawa Mitsuru
Published: July 2006

The reactions of N-monosubstitued thioureas (1) with β-haloacyl halides (2) were carried out in 5% NaOH–CH2Cl2 in the presence of a phase transfer catalyst to afford N-thioamido-β-lactams (3 and 5), thioureido acids (4), and 5-hydroxy-2-thiohexahydropyrimidin-4-ones (6). The compounds, 3 and 4, were readily converted to 5,5-dimethyl-2-thiohexahydropyrimidin-4-ones (7) with 6N HC1.
A SHORT-STEP SYNTHESIS OF (±)-PYRENOPHORIN UTILIZING 3-ALKENOATE AS A MASKED SYNTHON OF 4-OXO-2-ALKENOATE
Authors: Fujisawa Tamotsu , Takeuchi Masashi , Sato Toshio
Published: July 2006

The use of 3-alkenoate as a masked synthon of 4-oxo-2-alkenoate was established by a three step conversion of 3-nonenoate into 4-oxo-2-nonenoate through epoxidation, isomerization to an allyl silyl ether, and oxidation in a high overall yield. This method was applied to the short step synthesis of pyrenophorin from 7-oxo-3-octenoic acid.
SELECTIVE HYDRATION OF ACRYLONITRILE ON METAL OXIDE CATALYSTS
Authors: Miura Hiroshi , Sugiyama Kazuo , Kawakami Soichiro , Aoyama Toshiyuki , Matsuda Tsuneo
Published: July 2006

The selective hydration of acrylonitrile to form acrylamide has been studied on several metal oxide catalysts. MnO2, CuO and Co3O4 catalysts were found to be active and selective. Catalytic activities were strongly affected by the method of preparation. Hydration activity of MnO2 was related to the amount of phenol adsorption.
FLUORESCENT CROWN ETHER REAGENT FOR ALKALI AND ALKALINE EARTH METAL IONS
Authors: Nishida Hiroshi , Katayama Yoshiki , Katsuki Hideto , Nakamura Hiroshi , Takagi Makoto , Ueno Keihei
Published: July 2006

N-(4-methylumbelliferone-8-methylene)-monoaza-15-crown-5 (1) and -18-crown-6 (2) extracted most efficiently lithium and potassium, respectively, from aqueous solution to 1,2-dichloroethane. The similar fluorescent crown ether derived from diaza-18-crown-6 (3) was selective to calcium. The fluorimetric determination of lithium and calcium was feasible by using 1 and 3, respectively.
SYNTHETIC APPROACH TOWARD MITOMYCINS. EFFICIENT SYNTHESIS OF MITOSANE PRECURSORS FROM (2,4-PENTADIENYL)-p-QUINONES
Authors: Naruta Yoshinori , Arita Yoshihiro , Nagai Naoshi , Uno Hidemitsu , Maruyama Kazuhiro
Published: July 2006

Introduction of 2,4-pentadienyl side chain to halogenated p-quinones is performed with (2,4-pentadienyl)trimethylstannane to afford 2-halo-3-(2,4-pentadienyl)-1,4-quinones. Pyrolytic decomposition of the corresponding azidoquinones derived from the obtained haloquinones affords 3H-pyrrolo[1,2-a]indol-5,8-dione derivatives in good yields.
PHOTOREDUCTION OF CYTOCHROME C3 AND HYDROGEN EVOLUTION WITH HYDROGENASE
Authors: Okura Ichiro , Takeuchi Makoto , Kusunoki Shin , Aono Shigetoshi
Published: July 2006

The formation of the reduced form of cytochrome c3 was established when an aqueous solution containing Zn-TPPS3, cytochrome c3 and triethanolamine was irradiated by visible light. When hydrogenase was added to the system hydrogen evolution was observed by the irradiation of sunlight.
ASYMMETRIC INDUCTION IN THE [2,3] SIGMATROPIC REARRANGEMENT VIA SULFUR YLIDES DERIVED FROM CHIRAL KETENIMINES
Authors: Hiroi Kunio , Sato Shuko
Published: July 2006

The asymmetric [2,3] sigmatropic rearrangement of 2-alkylamino-3-phenyl-2-pentenylmethylsulfonium methylide (4) was accomplished by reaction of ethylphenylketenimines 2, having chiral carbons next to the nitrogen atoms, with trimethylsulfonium ylide (3) and acidic hydrolysis of the imines 5 obtained led to optically active 3-methylthiomethyl-3-phenyl-2-pentanone (6). The reaction of ethylphenylketene (−)-menthylimine (2f) with 3 at −78 °C resulted in the highest optical yield (55.6%) of (R)-(−)-6 in the same sequence.
ENANTIOSELECTIVE ESTER HYDROLYSIS CATALYZED BY A MICELLAR MODEL OF ZINC ENZYMES
Authors: Ogino Kenji , Tomita Isamu , Machiya Koji , Tagaki Waichiro
Published: July 2006

N-Laurylimidazoles containing l-2-pyrrolidinemethanol function gave large rate enhancements [kobsda(L)/kobsdo(L)=56–401] and reasonable enantioselectivities[kobsda(L)/kobsda(D)=1.40–3.92] in the presence of zinc ion and CTABr micelle for the hydrolysis of p-nitrophenyl l-and d-N-benzyloxycarbonylphenylalanates.
N,N,N′,N′-TETRAMETHYLCHLOROFORMAMIDINIUM CHLORIDE AS AN EFFICIENT CONDENSATION REAGENT FOR A NOVEL ESTERIFICATION APPLICABLE TO THE MACROLIDE SYNTHESIS
Authors: Fujisawa Tamotsu , Mori Toshiki , Fukumoto Kazumasa , Sato Toshio
Published: July 2006

N,N,N′,N′-Tetramethylchloroformamidinium chloride, prepared easily from N,N,N′,N′-tetramethylurea and oxalyl chloride, is found to be an efficient condensation reagent for an esterification of carboxylic acids with alcohols under mild conditions in one-pot procedure, and the reagent is applied to the lactonization for macrolide synthesis from ω-hydroxycarboxylic acids.
TETRAHEMOPROTEIN, CYTOCHROME c3 AS AN ORGANIC CONDUCTIVE MATERIAL
Authors: Ichimura Kenji , Kimura Keisaku , Nakahara Yusuke , Yagl Tatsuhiko , Inokuchi Hiroo
Published: July 2006

The electrical conductivity of a cytochrome c3 anhydrous film was measured in the region between 269 and 300 K under high-pressure hydrogen at 1000 kPa. The minimum value of the electrical resistivity of cytochrome c3 reached to the order of 1×10−3 Ωcm at 292 K.
STANNOUS TRIFLATE MEDIATED ALDOL REACTION OF 3-ACYLTHIAZOLIDINE-2-THIONE: A CONVENIENT METHOD FOR THE STEREOSELECTIVE SYNTHESES OF β-HYDROXY ALDEHYDE AND β-HYDROXY CARBOXYLIC ACID DERIVATIVES
Authors: Mukaiyama Teruaki , Iwasawa Nobuharu
Published: July 2006

Divalent tin enolates, formed from stannous triflate and 3-acylthiazolidine-2-thiones, react with aldehydes to afford the corresponding aldol products in high yields with high erythroselectivities. The adducts are easily transformed into β-hydroxy aldehyde and β-hydroxy carboxylic acid derivatives.
ION TRANSPORT ABILITY AND SELECTIVITY RELATING TO THE STRUCTURE OF SYNTHETIC IONOPHORES
Authors: Kuboniwa Hitoshi , Yamaguchi Kazuo , Hirao Akira , Nakahama Seiichi , Yamazaki Noboru
Published: July 2006

o-,m-,p-Substituted benzoic acids (1, 2, 3) with polyether chain bearing hydroxy group at the end and the methylether of 1 (4) were prepared. With active transport of Na+ and K+ by 1∼4, 1 and 4 exhibited K+-selectivity over Na+, while 2, and 3 had no transport ability. From the results of ion transport and 1H-NMR study, relationship between the structure and transport ability was discussed.
OBSERVATION OF LANTHANOID-INDUCED Pt-195 SHIFTS FOR THE ADDUCT OF BIS(ACETYLACETONATO)Pt(II) WITH TRIS(8,8,8,7,7,6,6-HEPTAFLUORO-2,2-DIMETHYLOCTANE-3,5-DIONATO)Pr(III) IN CDCl3 SOLUTION
Authors: Hirayama Masatoshi , Sasaki Yuko
Published: July 2006

The lanthanoid-induced 195Pt shifts were observed on the successive addition of Pr(fod)3 (L) to a 0.46 mol·dm−3 CDCl3, solution of Pt(acac)2(S) at an ambient probe temperature (25°C). The equilibrium constant and 195Pt intrinsic shift were estimated with the least squares fits of data to a plausible equilibrium between S and its 1:1 adduct with L formed via bidentate interaction.
OPTICAL RESOLUTION OF COBALT(III) COMPLEXES via CYCLODEXTRIN INCLUSION COMPOUNDS
Authors: Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

Tris(chelate)cobalt(III) complexes with a long alkyl or bromoalkyl chain, [Co (en)2 (NH2CH2CH2SR)]3+ (R=(CH2)nBr and (CH2)nCH3), were partially resolved by stereoselective inclusion of the free side-chain into α- or β-cyclodextrin(CDX). α- and β-CDX preferentially include the Δ- and Λ-complexes, respectively.
NEW [2.2]ORTHOCYCLOPHANES AND [2.2]METACYCLOPHANE HAVING SILICON- SILICON BONDS AS BRIDGING UNITS
Authors: Sakurai Hideki , Nakadaira Yasuhiro , Hosomi Akira , Eriyama Yuichi
Published: July 2006

Four new [2.2]cyclophanes having two silicon-silicon bridges were prepared by the Diels-Alder reaction of 3,3,4,4,7,7,8,8-octamethyl-3,4,7,8-tetrasilacycloocta-1,5-diyne. These novel cyclophanes and two other related compounds are characterized by various spectra.
THE MECHANISM OF ASYMMETRIC TRANSFORMATION OF 2-SUBSTITUTED ALKANOIC ACIDS VIA CHIRAL OXAZOLINES
Authors: Shibata Saizo , Matsushita Hajime , Kaneko Hajime , Noguchi Masao , Saburi Masahiko , Yoshikawa Sadao
Published: July 2006

The mechanism of asymmetric transformation of 2-substituted alkanoic acids via chiral oxazolines was examined using two epimers of (4S)-2-(1-phenylethyl)-4-benzyloxazoline. The transformation in THF was elucidated to be governed by kinetic control, and its process was clarified by measuring the ratio of 13C-labeled lithio oxazolines by 13C NMR.
A SIMPLE CONVERSION OF N,N-DIMETHYL-2-ALKENYLAMINE TO 2-ALKENAL
Authors: Takabe Kunihiko , Yamada Takashi , Katagiri Takao
Published: July 2006

Treatment of N,N-dimethyl-2-alkenylamine with 30% H2O2 followed by acetic anhydride affords 2-alkenal (α,β-unsaturated aldehyde) in good isolated yield.
THE STRUCTURE OF BIS(DIBENZYLAMINE)BIS(ETHYLTHIOACETATO)COPPER(II) –SQUARE-PLANAR COPPER(II) COMPLEX
Authors: Sato Yoshiyuki , Ouchi Akira
Published: July 2006

The crystal and molecular structure of the title complex has been determined by the X-ray diffraction. The copper(II) atom is in a square-planar geometry, being coordinated with two nitrogen and two oxygen atoms. No atoms other than the phenyl group ones of the ligand exist in the axial direction of the CuN2O2 plane.
ION EXCLUSION CHROMATOGRAPHIC DETERMINATION OF WEAK ACIDS USING A CARBONIC ACID SOLUTION AS ELUENT
Authors: Itoh Hisaaki , Shinbori Yoshio
Published: July 2006

By using a carbonic acid solution as eluent which permits conductivity detection of ionic species without a suppressor as a postcolumn reactor, ion exclusion chromatographic determination of some organic acids was carried out sensitively by means of the conductivity detector.
MAGIC-ANGLE-SPINNING 29Si-NMR STUDY OF THE STRUCTURE OF ZSM-5 AND ZSM-11 ZEOLITES
Authors: Nagy J B , Gabelica Z , Derouane E G , Jacobs P A
Published: July 2006

Eight magnetically different 29Si-NMR lines are clearly distinguished in the solid state high resolution spectra of HZSM-5 zeolite with a high Si/Al ratio (1000) and some of them are assigned. The resonance line at −105 ppm in both HZSM-5 and HZSM-11 zeolites is attributed to Si atoms in the second coordination sphere of an Al atom, i.e. Si (1 Al). The −115 ppm lines stem from Si atoms in 4-membered rings. The splitting of these lines originates from a probable strain in these small rings. The incorporation of Al atom occurs exclusively in the 5-membered rings.
SYNTHESIS OF PERFLUORINATED 1,3-DITHIOLES FROM FLUOROOLEFINS
Authors: Burton Donald J , Inouye Yoshio
Published: July 2006

In contrast to the formation of 2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithietane from hexafluoropropene, potassium fluoride, and sulfur, perfluoro-2-butene and perfluoro-pentenes react with potassium fluoride and sulfur to form perfluoro-1,3-dithioles via intermediate thioenolate anions.
A NOVEL INTRAMOLECULAR ADDITION OF PHOTOCHEMICALLY OR THERMALLY GENERATED KETENE TO A [4π+2σ] ELECTRONIC SYSTEM
Authors: Nitta Makoto , Omata Akihiko , Namiki Masamichi
Published: July 2006

The photochemical or thermal reaction of exo-6-methoxy-1,5,6-trimethyl- or exo-6-methoxy-1,3,5,6-tetramethyltricyclo[3.2.1.02,7]oct-3-en-8-one resulted in the novel formation of rapidly equilibrating valence isomers of norcaradiene-cycloheptatriene derivative via a ketene intermediate.
INFRARED SPECTRA AND VIBRATION-ROTATION ANALYSES OF THE ν1 AND ν5 BANDS OF SILANE-d3
Authors: Ohno Keiichi , Matsuura Hiroatsu , Murata Hiromu
Published: July 2006

Infrared spectra of the ν1 and ν5 bands of gaseous silane-d3 were measured by a Fourier transform spectrometer. The analysis of the ν1 band gave the ground-state constants for 28SiHD3: B0=1.777388±0.000075 cm−1, (DJ)0=(1.5895±0.0090)×10−5 cm−1, and (DJK)0=−(1.136±0.057)×10−5 cm−1. The spectroscopic constants for the v1=1 and the v5=1 states were also determined.
LOWERING OF THE ROTATIONAL BARRIER ON INTRODUCTION OF A FLUORO GROUP INTO 1-POSITION OF 9-(1-NAPHTHYL)FLUORENE SYSTEMS
Authors: Murata Shigeru , Mori Teruo , Oki Michinori
Published: July 2006

Rotational barriers in 1-fluoro-9-(1-naphthyl)fluorene and 1-fluoro-(2-methyl-1-naphthyl)fluorene were found to be lower by ca. 0.5 kcal/mol than those of their parent hydrocarbons. The results are attributed to raising of the ground state energy due to introduction of the fluoro group.
HASHISH:1 SYNTHESIS OF A NOVEL Δ9-TETRAHYDROCANNABINOL (THC) ANALOG
Authors: Jorapur Vaman S , Khalil Zarif H , Duffley Richard P , Razdan Raj K , Hagi-Bakar Mohd Rouyon B , Bhacca Norman S
Published: July 2006

Treatment of cannabinoid diacetate (2b) with N-bromosuccinimide gave the brominated product 2c in excellent yield, which with base formed a novel cannabinoid 3b. The structure was confirmed by 13C n.m.r. and 1H n.m.r. nuclear Overhauser enhancement spectral studies.
MECHANISM OF UNCOUPLER-MEDIATED CATION TRANSPORT AND CORRELATION BETWEEN THE IONOPHORIC ACTIVITY OF UNCOUPLER AND ITS UNCOUPLING ACTIVITY
Authors: Ueno Masaharu , Yasui Tomomi , Horikoshi Isamu
Published: July 2006

Uncoupler-mediated cation transport across liposomal membrane was studied. The pH dependencies of cation leaks were different between counter ions. The mechanism was proposed and ion selectivity was discussed. The correlation between the ionophoric activity of the uncoupler and its uncoupling activity was also shown.
STRUCTURE OF THE METAL SCHIFF BASE COMPLEX OF PYRIDOXAL AND HISTIDINE IN SOLUTION
Authors: Kondo Hiroki , Yoshinaga Hiroyuki , Morita Kanzi , Sunamoto Junzo
Published: July 2006

The cyclization of pyridoxal Schiff base of histidine or histamine is prohibited by metal ions such as Cu2+ and Zn2+. On the basis of a similar extent of metal inhibition for histidine and histamine, it is concluded that an identical Schiff base complex with the imidazole group coordinating to the metal is responsible for the inertness of both substrates.
FORMATION OF CYCLOPROPANE DERIVATIVES IN THE BLAISE REARRANGEMENT
Authors: Abe Yukio , Suehiro Tadashi
Published: July 2006

On heating tosylates of ethyl 2-alkyl-2-methyl-3-hydroxy-3-phenylpropanoate (R=Me, 1b; R=Et, 6) in o-dichlorobenzene at 170 °C, ethyl 1-methyl-2-phenyl- and 1,2-dimethyl-3-phenylcyclopropanecarboxylates, 3, and 8, were formed in both 5% yield, respectively, whereas the alkyl migration products, ethyl 3-alkyl-2-methyl-3-phenylpropenoates, were not produced. The mode of the reaction of the methyl group with the cationic carbon was described.
ALKYL–PHENYL INTERACTION IN ENANTIOMER DIFFERENTIATING ACYLATION
Authors: Hiraki Yuji , Tai Akira
Published: July 2006

The enantiomer-differentiating acylation (kinetic resolution) of α-substituted benzylamine with (S)-2-phenylbutyric acid anhydride was carried out in organic and aqueous media. (R)-Amines reacted in excess in organic media, while (S)-amines reacted in large excess in aqueous media. These differences in the chiral recognition were interpreted based on the idea that the attractive interaction took place between phenyl and alkyl groups in aqueous media.
SYNTHESIS OF γ-KETOPIMELIC ACID DERIVATIVES BY RHODIUM CARBONYL-CATALYZED HYDROCARBONYLATION OF ACRYLIC ACID DERIVATIVES
Authors: Hong Pangbu , Mise Takaya , Yamazaki Hiroshi
Published: July 2006

The rhodium carbonyl-catalyzed reactions of acrylic acid derivatives (1) with CO in iso-propanol gave selectively γ-ketopimelic acid derivatives (2) in good yields. In the reaction of ethyl acrylate (1b) in  iso-propanol-d8, deuterium scrambling in the methylene groups of the product (2b) was observed.
PREPARATION OF (2E)-t-BUTYL 4,5,7-TRIHYDROXY-2-OCTENOATES CONTAINING THREE NON-RACEMIC CHIRAL CENTERS
Authors: Mitsunobu Oyo , Ebina Masahiko , Ogihara Tsuyoshi
Published: July 2006

The hydrophilic part of 14-membered-ring macrolide, colletodiol, containing three chiral centers has been prepared from l-rhamnose and d-glucose, suitable for further synthesis.
RHODIUM CARBONYL-CATALYZED CROSS-HYDROCARBONYLATION OF ACETYLENES AND ETHYLENE. SYNTHESIS OF α,β-UNSATURATED KETONES
Authors: Mise Takaya , Hong Pangbu , Yamazaki Hiroshi
Published: July 2006

The cross-hydrocarbonylation of acetylenes and ethylene with CO and H2 in the presence of Rh4(CO)12 gave α,β-unsaturated ethyl ketones regio- and stereoselectively.
SYNTHESIS AND MAGNETIC PROPERTY OF EUROPIUM(II) HALOBORATES, Eu2BO3X (X=Cl and Br)
Authors: Machida Ken-ichi , Adachi Gin-ya , Shiokawa Jiro
Published: July 2006

New europium(II) haloborates, Eu2BO3X (X=Cl and Br), were prepared by solid state reactions of Eu3(BO3)2 and EuCl2 or EuBr2′ and were found to be ferromagnets with 4.2<TC<5 K. The hexagonal-prismlike single crystals, which have been grown from the molten samples containing a large excess of EuX2 as a flux, crystallize in the hexagonal system (space group: P63mc).
SPIN TRAPPING BY USE OF A WATER-SOLUBLE NITROSO COMPOUND
Authors: Konaka Ryusei , Sakata Shigeru
Published: July 2006

The preparation of sodium 2,4-dimethyl-3-nitrosobenzenesulfonate and its perdeuterio-analogue and their use in spin trapping in aqueous solutions are described.
SPECTROSCOPIC STUDIES ON THE SYNTHETIC MAGNESIUM PORPHYRINS IN THE VESICLES AS TRANS-MEMBRANE ELECTRON TRANSPORT SENSITIZERS
Authors: Katagi Toshiyuki , Yamamura Takeshi , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

Synthetic magnesium porphyrins, Mg-P3+ and Mg-P were solubilized into DPPC vesicles and the trans-membrane electron transport from EDTA·2Na to MV2+ was studied in the concentration range where the porphyrins did not aggregate. Mg-P3+ was found to photo-catalyze the reaction about 30 times as efficiently as Mg-P.
DIELS–ALDER ADDUCTS FROM N-UNSUBSTITUTED TAUTOMERIC 2(1H)-PYRIDONE-2-HYDROXYPYRIDINES; 5,6-BENZO-2-AZABARRELENONES AND 5,6-BENZO-2-AZABARRELENES
Authors: Kuzuya Masayuki , Mano Ei-ichi , Adachi Michihiro , Noguchi Akihiro , Okuda Takachiyo
Published: July 2006

Diels–Alder reactions of several N-unsubstituted tautomeric 2(1H)-pyridone-2-hydroxypyridines with benzyne were examined and found to afford 5,6-benzo-2-azabarrelenones, which were converted to hitherto unknown 5,6-benzo-2-azabarrelenes.