bluuebunny/crossref_metadata_2025_split huggingface dataset:
STRUCTURE OF A POTENT MUTAGEN ISOLATED FROM FRIED BEEF
Authors: Kasai Hiroshi , Yamaizumi Ziro , Shiomi Tomoko , Yokoyama Shigeyuki , Miyazawa Tatsuo , Wakabayashi Keiji , Nagao Minako , Sugimura Takashi , Nishimura Susumu 
Published: July 2006

Abstract
A new potent mutagen was isolated from fried beef. The molecular formula was determined as C11H11N5 by exact mass measurement. The chemical structure of this mutagen was determined to be 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (Me-IQx) by the analyses of its UV, mass and 1H-NMR spectra, and chemical synthesis.
A COMPUTER-AIDED SEQUENCE DETERMINATION OF A POLYPEPTIDE FROM THE MASSES AND EDMAN-DEGRADATION OF ITS CONSTITUENT PEPTIDE FRAGMENTS
Authors: Shimonishi Yasutsugu , Hong Yeong-Man , Kitagishi Toyoko , Katakuse Itsuo , Matsuo Takekiyo , Matsuda Hisashi , Hara Saburo , Ikenaka Tokuji , Izumi Yoshiharu 
Published: July 2006

Abstract
A new method is described for amino acid sequencing of a polypeptide or protein involving Edman-degradation and field-desorption mass spectrometry of its constituent peptides in mixtures. The sequences can be sought from the molecular weights and N-terminal amino acid residues of the constituent peptides and the phenylthiohydantoins released in each cycle of degradation using a computer program.
ELECTRON TRANSPORT ACROSS LIPID MEMBRANES PHOTOSENSITIZED BY AN AMPHIPHILIC ZINC PORPHYRIN
Authors: Katagi Toshiyuki , Yamamura Takeshi , Saito Taro , Sasaki Yukiyoshi 
Published: July 2006

Abstract
Electron transport reaction from EDTA·2Na to methylviologen (MV2+) across the membrane of single-lamella vesicles of dipalmitoyl-l-α-phosphatidylcholine (DPPC) is photosensitized by an amphiphilic zinc porphyrinato complex, 5,10,15-tris-(l-methylpyridinium-4-yl)-20-(4-stearoxyphenyl)porphyrinatozinc(II) trichloride (Zn–P). This porphyrin complex can be incorporated into the vesicles symmetrically (on both sides of the membrane) or asymmetrically (only on the outer side). The symmetrical system facilitates the electron transport even in the absence of electron mediators.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON THE PHOTOINDUCED SUBSTITUTION REACTION OF 4-METHYLQUINOLINE-2-CARBONITRILE IN ETHANOL
Authors: Hata Norisuke , Hokawa Masahito 
Published: July 2006

Abstract
The photoinduced substitution reaction of 4-methylquinoline-2-carbonitrile in ethanol was found to undergo external magnetic field effect due to both HFI-J and Δg mechanisms. The present study is also considered to provide definitive evidence that the reaction proceeds primarily through hydrogen abstraction by the ring nitrogen from the hydrogen-bonded ethanol in the S1 state.
THE FORMATION OF 1- AND 3-SUBSTITUTED INDOLES IN THE REACTION BETWEEN INDOLE AND SODIUM GLYOXYLATE
Authors: Amat-Guerri Francisco , Martinez-Utrilla Roberto , Pascual Conrad 
Published: July 2006

Abstract
The reaction between indole and sodium glyoxylate under basic conditions produces, in addition to the expected sodium 3-indolylglycolate (3a), the 1-substituted derivative (4a). 3a partially condenses with unreacted indole and with 4a yielding the corresponding 3 ,3′-diindolyllmethane derivatives, 5a and 6a. All compounds were isolated and identified as methyl esters.
ION-BINDING PROPERTIES OF N,N′-DISUBSTITUTED DIAZA-CROWN ETHERS
Authors: Cho Iwhan , Chang Suk-Kyu 
Published: July 2006

Abstract
Derivatives of diaza-18-crown-6 and diaza-15-crown-5 were synthesized and their complexation properties were examined by solvent extraction and liquid membrane transport of various cations. N,N′-Bis(aminoalkyl) derivatives were particular in exhibiting unusually high but non-selective ion-binding efficiency toward various cations.
4-CHLOROPHENYL 5-CHLORO-8-QUINOLYL PHOSPHOROTETRAZOLIDE: A HIGHLY EFFICIENT PHOSPHORYLATING AGENT FOR OLIGORIBONUCLEOTIDE SYNTHESIS
Authors: Takaku Hiroshi , Nomoto Tadaaki , Kamaike Kazuo 
Published: July 2006

Abstract
4-Chlorophenyl 5-chloro-8-quinolyl phosphorotetrazolide (2) was a highly efficient phosphorylating agent for the synthesis of 5′-O-dimethoxytrityl-2′-O-tetrahydropyranylnucleoside 3′-(4-chlorophenyl, 5-chloro-8-quinolyl) phosphates (4). The fully protected ribonucleoside 3′-phosphotriesters 4 are key intermediates for the synthesis of oligoribonucleotides via phosphotriester approach.
A FACILE SYNTHESIS OF 1,3-CYCLOALKADIONES
Authors: Nishiguchi Ikuzo , Hirashima Tsuneaki , Shono Tatsuya , Sasaki Manji 
Published: July 2006

Abstract
1,3-Cycloalkadiones were prepared by the reaction of l,2-bis(trimethylsiloxy)cycloalkenes with chloromethyl methyl ether followed by treatment of the resulting 2-hydroxy-2-methoxymethyl cycloalkanones with potassium hydrogen sulfate. The first step of the reactions was effectively catalyzed by active zinc reagents prepared from zinc–copper and alkyl iodides.
THE REACTION OF 3-CYANO-2H-CYCLOHEPTA[b]FURAN-2-ONE WITH β, β-DISUBSTITUTED ENAMINES
Authors: Yasunami Masafumi , Chen Alice , Noro Yukio , Takase Kahei 
Published: July 2006

Abstract
The reaction of 3-cyano-2H-cyclohepta[b]furan-2-one with enamines derived from isobutyraldehyde gave 2-amino derivatives of 3-cyano-1,1-dimethyl-1,2-dihydroazulene, which on heating with sulfuric acid underwent the elimination of amines accompanied by the migration of the methyl group to give 1,2-dimethylazulenes.
USE OF MAGNETIC CIRCULAR DICHROISM IN THE SPIN-FORBIDDEN TRANSITIONS AS A STRUCTURAL PROBE OF CHROMIUM(III) COMPLEXES WITH EDTA ANALOGUES
Authors: Kaizaki Sumio , Mori Hisako 
Published: July 2006

Abstract
Well resolved magnetic circular dichroism spectra have been observed in the spin-forbidden d–d transitions of several Cr(III) complexes with edta analogues at ambient temperature. The positions of the doublet states thus detected have been correlated with the ring size of the chelates in the complexes concerned. From a structural point of view, their positional shifts have been elucidated in terms of the angular overlap model.
THE SYNTHESIS OF HEPTATRIDECA-, HEPTAPENTADECA-, AND HEPTAHEPTADECAFULVALENE DERIVATIVES
Authors: Morita Noboru , Asao Toyonobu , Ojima Juro , Wada Kazuyo 
Published: July 2006

Abstract
Title fulvalenes (6∼9) were synthesized in one step by the reaction of the corresponding large membered annulenones (1∼4) with 8-oxoheptafulvene, and 1H-nmr spectra were discussed in connection with their tropicity.
HIGH RESOLUTION 13C NMR STUDY OF (1→3)-β-d-GLUCANS BY CROSS POLARIZATION/MAGIC ANGLE SPINNING: EVIDENCE OF CONFORMATIONAL HETEROGENEITY
Authors: Saitô Hazime , Tabeta Ryoko , Harada Tokuya 
Published: July 2006

Abstract
Conformation of various (1→3)-β-d-glucans in solid state was examined by 13C cross polarization/magic angle spinning NMR spectroscopy. It was found that high molecular-weight glucans adopt mainly helix form, whereas low molecular weight ones take considerable proportion of random-coil form in addition to the helix in solid.
PREPARATION AND SPECTROSCOPIC PROPERTIES OF A PAIR OF GEOMETRICAL ISOMERS, cis- AND trans-BIS (ACETYLACETONATO) BIS (DIMETHYLPHENYLPHOSPHINE)COBALT(III) COMPLEXES
Authors: Kashiwabara Kazuo , Katoh Katsuaki , Fujita Junnosuke , Nishikawa Hiroaki , Shibata Muraji 
Published: July 2006

Abstract
A pair of geometrical isomers, cis- and trans-bis(acetylacetonato)bis(dimethylphenylphosphine)cobalt(III) complexes were prepared, and the structures were assigned on the basis of the 1H and 13C NMR spectra. The trans isomer shows a strong absorption band in the first absorption band region, its intensity being 40 times as large as that of the cis isomer.
SYNTHESIS OF MEMBRANE SUBSTANCES: PHOSPHATIDYL-α-DIGLUCOSYL DIGLYCERIDE AND RELATED GLYCOLIPIDS
Authors: Boeckel Stan A A Van , Boom Jacques H Van 
Published: July 2006

Abstract
The recently developed tetraisopropyldisiloxane-1,3-diyl protecting group enabled us to synthesize a naturally occurring phosphatidyl-α-diglucosyl diglyceride as well as the glycolipid α-diglucosyl diglyceride and a derivative thereof which is acylated on the 6′-position by a fatty acid.
ELECTRON SPIN RESONANCE OF THIAHETEROHELICENE RADICAL ANIONS
Authors: Tanaka Hisao , Ogashiwa Susumu , Kawazura Hiroshi 
Published: July 2006

Abstract
Hyperfine couplings in radical anions of benzodithiophene, [5]-thiaheterohelicene, and [7]-thiaheterohelicene were assigned by using their deuteriated compounds. The couplings calculated by a simple π-MO method agreed with the experimental ones, indicating an overwhelming contribution of π-conjugation to the spin distribution in the radicals, irrespective of the inherently staggered structure.
TOTAL SYNTHESIS OF CURZERENONE AND EPICURZERENONE
Authors: Miyashita Masaaki , Kumazawa Toshiaki , Yoshikoshi Akira 
Published: July 2006

Abstract
Curzerenone and epicurzerenone were synthesized by means of a combination of γ-ketoester synthesis and 3-methylfuran annulation both of which utilize nitroolefins as synthons. Starting material, methyl 2-methyl-4-oxo-2-vinylpentanoate, was prepared by the Lewis acid-promoted reaction of l-methoxy-2-methyl-l-[(trimethylsily)oxy]-1,3-butadiene and 2-nitropropene, while key intermediate 3,6-dimethyl-6-vinyl-6,7-dihydrobenzofuran-4(5H)-one was assembled by the KF-catalyzed reaction of 5-methyl-5-vinylcyclohexane-l,3-dione and 1-nitro-1-phenylthiopropene.
SYNTHESIS OF 2,7-BIS(DIMETHYLAMINO)-PYRENE AND -TETRAHYDROPYRENE AND ELECTRICAL CONDUCTIVITIES OF THEIR CT COMPLEXES
Authors: Natsume Bunji , Nishikawa Naomi , Kaneda Takahiro , Sakata Yoshiteru , Misumi Soichi , Enoki Toshiaki , Inokuchi Hiroo 
Published: July 2006

Abstract
The synthesis of the title new π-donors using a unique transannular reaction of [2.2]metacyclophane and the electrical conductivities of their CT complexes with a few π-acceptors were reported.
INFRARED STUDY OF CROTONALDEHYDE OXIDATION BY 12-MOLYBDOPHOSPHORIC ACID
Authors: Tsai Tian-hsi , Maruya Ken-ichi , Ai Mamoru , Ozaki Atsumu 
Published: July 2006

Abstract
IR spectra of H3PMo12O40 (HPA) with adsorbed crotonaldehyde disclosed that HPA is reduced by crotonaldehyde only in the presence of water, giving furan as the oxidation product. Water is evidentially involved in the reaction path of crotonaldehyde oxidation, being consistent with water-enhanced catalytic oxidation of crotonaldehyde on HPA.
RETRO-DIELS–ALDER REACTION OF ASATONE: SYNTHESIS OF HETEROTRQPANONE AND ISOHETEROTROPANONE
Authors: Yamamura Shosuke , Niwa Masatake 
Published: July 2006

Abstract
Two novel neolignans, heterotropanone and isoheterotropanone, have been synthesized by retro-Diels–Alder reaction of asatone in l-allyl-3,4,5-trimethoxybenzene. These two neolignans have also been obtained on thermal reaction of asatone followed by methylation.
THE HOMOLOGATION OF METHANOL. THE MODIFICATION OF COBALT CATALYST BY DIPHOSPHINES
Authors: Sugi Yoshihiro , Bando Ken-ichiro , Takami Yasuo 
Published: July 2006

Abstract
Cobalt iodide modified by α,ω-bis(diphenylphosphino)alkane (PCnP; n=1–6) efficiently catalyzes the homologation of methanol to ethanol. The ethanol selectivity as high as 89% was achieved by using PC6P as the ligand.
PARA-PREFERENTIAL ANODIC CHLORINATION OF ALKOXYBENZENES
Authors: Matsuda Yoshiharu , Hayashi Hiroyasu 
Published: July 2006

Abstract
Anodic chlorination of methoxy- and ethoxybenzenes yielded p-alkoxychlorobenzenes preferentially. The p-/o- ratios were 34.5 in N,N-dimethylacetamide-LiCl and 17.1 in N,N-dimethylformamide-LiCl. In the former case, the current efficiency for producing p-chloromethoxybenzene was 95.8% at Pt anode.
STEREOSELECTIVE MICELLAR CATALYSIS IN THE HYDROLYSIS OF ENANTIOMERIC ESTERS BY DIPEPTIDE DERIVATIVES CONTAINING HISTIDINE RESIDUE
Authors: Ihara Yasuji , Kunikiyo Noriko , Kunimasa Tomoko , Nango Mamoru , Kuroki Nobuhiko 
Published: July 2006

Abstract
The catalytic hydrolysis of enantiomeric substrates is examined using optically active dipeptide derivatives containing histidine residue in the presence of CTABr micelles. A very high stereoselectivity, kc(L)/kc(D), of 12.2 is observed in the reaction with the enantiomers of p-nitrophenyl N-methoxycarbonylphenylalanate (MocPheONp) and N-(benzyloxycarbonyl-l-leucyl)-l-histidine (ZLeuHis).
SURFACE STATES OF n-TYPE TiO2 ELECTRODE IN AQUEOUS SOLUTION
Authors: Kobayashi Kenklchiro , Aikawa Yoshihiro , Sukigara Mitsunori 
Published: July 2006

Abstract
The basic properties of surface states were studied by the capacitance measurements for TiO2 electrode to elucidate the role of the surface states on the charge transfer at electrode–electrolyte interface. The surface state density and its energy were obtained respectively to be Nt=1.5×1012 cm−2 and Et=0.4 eV below the bottom of the conduction band.
THEORETICAL CONSIDERATIONS ON THE PREFERENCE OF ALKYL/PHENYL APPROACHED CONFORMATIONS IN 1-ALKYL-2-PHENYL COMPOUNDS Ar–CH(CH3)–X-R
Authors: Hirota Minoru , Abe Kazuhlsa , Sekiya Toshlyuki , Tashiro Hiroshi , Nishio Motohiro , Osawa Eiji 
Published: July 2006

Abstract
The preferred conformations of t-butyl 1-phenylethyl sulfoxide, t-butyl 1-phenylethyl ketone, 2,2,4-trimethyl-4-phenylpentane-3-ol, and related compounds were estimated by the empirical molecular force field approach. The results are in accordance with the experiments, showing that the conformation in which the t-butyl group is trans to the methyl and gauche to the phenyl group is the most stable. The repulsive force between the t-butyl and the methyl groups is the main factor and the attractive van der Waals force is the secondary factor in determining the favored conformation.
MERCURY DISTRIBUTION IN THE NORTHWEST PACIFIC OCEAN NEAR JAPAN ISLANDS
Authors: Takahashi Jun’ichi , Haraguchi Hiroki , Fuwa Keiichiro 
Published: July 2006

Abstract
Mercury in the seawater collected from the Northwest Pacific Ocean was determined by a sensitive mercury analyzer set on the shipboard, where the mercury resonance line at 185.0 nm was used for atomic absorption measurement. The horizontal and vertical distributions of mercury will be reported in this communication.
FIRST OBSERVATION OF CIDNP SIGNALS DUE TO PORPHYRIN DURING THE COURSE OF LIGHT-INDUCED ELECTRON-TRANSFER FROM PORPHYRIN TO QUINONE
Authors: Maruyama Kazuhiro , Furuta Hiroyuki , Otsuki Tetsuo 
Published: July 2006

Abstract
The CIDNP signals due to porphyrin as well as quinone were observed upon illumination of porphyrin in the presence of quinone, indicating unambiguously the light-induced electron-transfer from porphyrin to quinone.
STRUCTURE AND ABSOLUTE CONFIGURATION OF (−)500CD-((2S,2′S)-1,1′-ETHYLENEDIPYRROLIDINE-2,2′-DICARBOXYLATO)(PIPECOLATO)COBALT(III)
Authors: Okamoto Ken-ichi , Okabayashi Minahiro , Ohmasa Masaaki , Einaga Hisahiko , Hidaka Jinsai 
Published: July 2006

Abstract
The absolute configuration of (−)500CD-((2S,2′S)-1,1′-ethylenedipyrrolidine-2,2′-dicarboxylato)(pipecolato)cobalt(III) was determined by X-ray diffraction study. This isomer has Δ-sym configuration and the asymmetric nitrogen and carbon atoms of the pipecolate ligand coordinated take R(N) and R(C) configurations, respectively.
CONVERSION OF 8-LANOSTEN-24-ONE INTO 8-LANOSTEN-23-ONE. 1,2-CARBONYL TRANSPOSITION ON THE LANOSTANE SIDE CHAIN
Authors: Namikawa Misuzu , Murae Tatsushi , Takahashi Takeyoshi 
Published: July 2006

Abstract
8-Lanosten-24-one was converted into 8-lanosten-23-one by carbonyl transposition via 23,23-dimethoxy-8-lanosten-24-one without degradation and reconstruction of the side chain. By the same procedure 29-nor-9(11)-lanosten-24-one was transformed into the corresponding 23-one.
3-NITRO-2-PYRIDINESULFENYL GROUP FOR PROTECTION AND ACTIVATION OF THE THIOL FUNCTION OF CYSTEINE
Authors: Matsueda Rei , Kimura Takahide , Kaiser Emil Thomas , Matsueda Gary R 
Published: July 2006

Abstract
The use of the 3-nitro-2-pyridinesulfenyl (Npys) halide, a versatile reagent in peptide chemistry, for the protection and activation of the thiol function is reported. Boc-Cys(Npys)–OH is prepared starting from bis(N-t-butyloxycarbonyl)-l-cystine. The Npys group is easily removed by treatment with a stoichiometric amount of tri-n-butylphosphine in the presence of water, but it is resistant to acids such as trifluoroacetic acid, HCl, and HF. Importantly, the cysteine residue modified with the Npys group can react selectively with free thiol of cysteine to afford a cystine disulfide bond.
SIMULTANEOUS DETERMINATION OF HYPOXANTHINE, XANTHINE AND URIC ACID USING AN IMMOBILIZED XANTHINE OXIDASE BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY
Authors: Tawa Riichi , Kito Masahiro , Hirose Shingo 
Published: July 2006

Abstract
Immobilized xanthine oxidase was prepared by intermolecular cross-linking to porous aminopropyl-glass beads, and the properties were investigated in a batch process. Simultaneous analysis of hypoxanthine, xanthine and uric acid was achieved by using small column packed with the immobilized xanthine oxidase as a reactor for high-performance liquid chromatography (HPLC).
ENHANCED EFFECT OF SPRAY-DRIED POTASSIUM FLUORIDE ON FLUORINATION
Authors: Ishikawa Nobuo , Kitazume Tomoya , Yamazaki Takashi , Mochida Yoshiharu , Tatsuno Toshio 
Published: July 2006

Abstract
Spray-dried potassium fluoride was found to be much less hygroscopic and much more effective as a fluorinating agent than usual calcine-dried potassium fluoride. Organic compounds containing an activated halogen atom were readily fluorinated in acetonitrile with spray-dried potassium fluoride.
CARBOXYLATION OF γ-BUTYROLACTONES WITH CARBON MONOXIDE USING HF–SbF5 SUPER ACID
Authors: Yoneda Norihiko , Suzuki Akira , Takahashi Yukio 
Published: July 2006

Abstract
γ-Butyrolactones react with carbon monoxide at −20 to 30 °C and at atmospheric pressure in HF–SbF5 super acid media containing an excess of SbF5 to give dicarboxylic acids in good yields.
A NEW LABILE SESQUITERPENE DIOL HAVING BROMINE FROM THE MARINE RED ALGA, LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Furusaki Akio , Katayama Chuji , Kikuchi Hajime , Suzuki Teruaki 
Published: July 2006

Abstract
A new labile brominated sesquiterpene diol was isolated from the red alga, Laurencia nipponica Yamada (Rhodomelaceae, Rhodophyta, Urasozo in Japanese). The structure of this compound was determined by its spectral properties and X-ray diffraction analysis.
DOUBLE LIGAND-EXCHANGE REACTIONS BETWEEN THE PENTAAMMINEFLUOROCOBALT(III) ION AND THE DICARBOXYLATO COMPLEXES OF ALUMINIUM(III)
Authors: Iida Masayasu , Ando Mieko , Yamatera Hideo 
Published: July 2006

Abstract
Double ligand-exchange reactions such as CoF(NH3)52++AlAn3-2n→CoA(NH3)5++AlFAn-14-2n (A2−= oxalate ion or malonate ion) were found to proceed in about 90% yield under the conditions, [A2−]total&gt;[Al3+]total&gt;&gt;[COF(NH3)52+].
HYDROXYLATION OF BENZENE WITH HYDROGEN PEROXIDE BY THE USE OF HYDROPHOBIC CATECHOLS AND Fe3+ COMPLEXES AS THE CATALYST
Authors: Hotta Kazuhiko , Tamagaki Seizo , Suzuki Yusuke , Tagaki Waichiro 
Published: July 2006

Abstract
Hydroxylation of benzene with H2O2 was carried out in the Presence of a variety of catechols and Fe3+ in a benzene–H2O biphase system. The hydrophobic catechols were found far more effective as the catalyst than the hydrophilic ones.
PHOTOCATALYTIC HYDROGEN PRODUCTION FROM WATER BY THE DECOMPOSITION OF POLY-VINYLCHLORIDE, PROTEIN, ALGAE, DEAD INSECTS, AND EXCREMENT
Authors: Kawai Tomoji , Sakata Tadayoshi 
Published: July 2006

Abstract
Xe-lamp irradiation of a platinized TiO2 photocatalyst in the presence of water and chlorine or nitrogen containing organic molecules, synthetic or natural, leads to the production of hydrogen at room temperature without the release of halogen or nitrogen compounds in the gas phase.
OBSERVATION OF THE CATIONS PRODUCED FROM CHLOROTHIOPHENES
Authors: Yokoyama Yukihiro , Yamashita Yukihide , Takahashi Kensuke , Sone Tyo 
Published: July 2006

Abstract
Well-resolved 1H NMR signals of the title cations were observed in HSO3F and AlCl3–HCl–CH2Cl2 systems. Chlorothiophenes are protonated exclusively at the positions adjacent to sulfur with or without substituents.
SYNTHESIS OF CHIRAL DEPSIPEPTIDE BUILDING BLOCK BY THE ASYMMETRIC REDUCTION OF N-(α-KETOACYL)-α-AMINO ESTERS
Authors: Ojima Iwao , Tanaka Toshiyuki , Kogure Tetsuo 
Published: July 2006

Abstract
Asymmetric reduction of N-(α-ketoacyl)-α-amino esters was performed by using homogeneous hydrosilylation and hydrogenation catalyzed by rhodium(I) complexes. The asymmetric hydrosilylation achieved good to high stereoselectivities giving the corresponding N-(α-hydroxyacyl)-α-amino esters, whereas only simple asymmetric induction arising from the chiral center of the substrate was observed in the case of hydrogenation.
REACTION OF NITRILE OXIDES WITH S,S-DIMETHYL-N-(2,4,6-TRIBROMOPHENYL) SULFIMIDE
Authors: Shigemoto Tadashi , Imamura Kiyoshi , Hayakawa Tohru , Ogawa Shojiro , Matsumoto Kazumasa , Shiraishi Shinsaku 
Published: July 2006

Abstract
2-Aryl-4,6-dibromobenzoxazoles were isolated in the reaction of benzonitrile oxides with S,S-dimethyl-N-(2,4,6-tribromophenyl)sulfimide. Structure determination was done by means of spectroscopic and elemental analyses.
PROTECTION OF ALCOHOLS AND ACIDS WITH ALLYLSILANES CATALYZED BY IODINE OR IODOTRIMETHYLSILANE IN CHLORINATED HYDROCARBON
Authors: Hosomi Akira , Sakurai Hideki 
Published: July 2006

Abstract
Many triorganosilyl ethers and esters were prepared by the reaction of allylsilanes with alcohols catalyzed by iodine or iodotrimethylsilane in excellent yields. Bromine and bromotrimethylsilane were also effective catalysts.
PALLADIUM CATALYZED REGIOSELECTIVE COTRIMERIZATION BETWEEN DIMETHYL ACETYLENEDICARBOXYLATE AND TWO 1-ALKENE MOLECULES
Authors: Itoh Kenji , Hirai Kenji , Sasaki Masaharu , Nakamura Yoshitaka , Nishiyama Hisao 
Published: July 2006

Abstract
In the presence of bis(maleic anhydride)(norbornene)palladium as a catalyst, two 1-alkene molecules, R–CH2–CH=CH2, were added regioselectively to dimethyl acetylenedicarboxylate in the syn addition mode to give dimethyl 2-(2-alkenyl)-3-alkylmaleates, R–CH=CH–CH2–C(COOCH3)=C(COOCH3)–CH2CH2CH2-R under moderate condition (40–45°C) in chloroform.
TWO NEARBY ELECTRONIC STATES OF PYRIDAZINE
Authors: Ueda Eiji , Udagawa Yasuo , Ito Mitsuo 
Published: July 2006

Abstract
Fluorescence excitation spectrum, SVL fluorescence spectra, MPI excitation spectrum in supersonic jet condition and absorption spectra in solvents at 4.2 K have been measured for the near UV transition of pyridazine. All support the interpretation that there exist two electronic states and their separation is 373 cm−1 in the gaseous state.
STEREOSELECTIVE TOTAL SYNTHESIS OF (±)-EREMOFORTIN B, A SESQUITERPENOID MYCOTOXIN OF Penicillium roquefovti
Authors: Yamakawa Koji , Mashiko Toshihisa , Satoh Tsuyoshi 
Published: July 2006

Abstract
The stereoselective total synthesis of (±)-eremofortin B (1), a sesquiterpenoid mycotoxin of Penicillium roqueforti, from 5β,6β-dimethyl-2,7-dioxo-Δ1(10)-octalin (2) is described. Stereochemistry of eremofortin B was confirmed as shown in 1.
OPTICAL RESOLUTION OF α-METHYLBENZYLAMINE AND 1-PHENYL-2-(p-TOLYL)ETHYLAMINE BY PREFERENTIAL CRYSTALLIZATION
Authors: Nohira Hiroyuki , Kai Mariko , Nohira Misako , Nishikawa Junji , Hoshiko Tomonori , Saigo Kazuhiko 
Published: July 2006

Abstract
(±)-α-Methylbenzylamine and 1-phenyl-2-(p-tolyl)ethylamine have been easily resolved into their optically active forms by preferential crystallization of their racemic salts with cinnamic acid.
A CRITICAL STUDY ON CIRCULAR DICHROISM MEASUREMENT IN LONGER SIDE OF VISIBLE REGION
Authors: Konno Toshio , Meguro Hiroshi , Murakami Tasuku , Hatano Masahiro 
Published: July 2006

Abstract
A test sample method revealed large instrumental deviations of molar ellipticities, [Θ], up to ±35% in circular dichroism(CD) in the 500-800 nm region, even after (+)-10-camphorsulfonic acid(CSA) calibration at 290 nm. Use of the nickel (II)tartrate solution and the tentative [Θ] values, −101.2 at 718 nm and −110.7 at 777 nm(degree dm3 · mol−1cm−1), were recommended to calibrate the wavelengths and magnitudes of the CD extrema in this region.