bluuebunny/crossref_metadata_2025_split huggingface dataset:
ENANTIOSELECTIVE SYNTHESES OF (−)-SEMBURIN AND (−)-ISOSEMBURIN
Authors: Takano Seiichi , Tamura Nobuhiko , Ogasawara Kunio , Nakagawa Yoshiko , Sakai Tsutomu 
Published: July 2006

Abstract
Validity of the proposed structures of (−)-semburin(1) and (−)-isosemburin(2), isolated from Swertia japonica Makino, has been established by the enantioselective total syntheses starting from the known chiral lactone(3).
STUDIES ON MOLYBDO-OXIDASE MODELS: ROLE OF HEMIN OR FLAVIN FOR AIR OXIDATION OF PPh3 BY Mo(VI) COMPLEXES OF CYSTEINE-CONTAINING PEPTIDES
Authors: Ueyama Norikazu , Kamada Etsuo , Nakamura Akira 
Published: July 2006

Abstract
Air oxidation of triphenylphosphine catalyzed by MoO2(cys-OMe)2, MoO2(cys-OEt)2, MoO2(cys-Met-OMe)2 was studied as models of molybdo-oxidase. Addition of hemin or riboflavin to the systems facilitates the catalytic activity. Redox cycle between Mo(VI) and Mo(V) proceeds smoothly with addition of the electron-transfer mediators which rapidly oxidize Mo(V) to Mo(VI).
PRESSURE–VOLUME–TEMPERATURE RELATIONSHIPS OF LIQUID DICHLOROMETHANE AND TRICHLOROMETHANE
Authors: Kumagai Akibumi , Takahashi Shinji 
Published: July 2006

Abstract
The specific volumes of liquid dichloromethane and trichloromethane were measured at constant temperature by the variable volume method using a glass piezometer in the temperature range from 273 to 348 K and in the pressure range up to 100 MPa. The specific volume vs. pressure isotherms are expressed by the Tait equation within an accuracy of 0.07%.
THERMAL ANALYSIS OF HOFMANN’S PYRROLE, THIOPHENE, BENZENE, PHENOL, AND ANILINE CLATHRATES Ni(NH3)2Ni(CN)4·2G BY DIFFERENTIAL SCANNING CALORIMETRY
Authors: Uemasu Isamu , Iwamoto Toschitake 
Published: July 2006

Abstract
Hofmann’s clathrates Ni(NH3)2Ni(CN)4·2G (G = C4H5N, C4H4S, C6H6, C6H5OH, or C6H5NH2) were analyzed by differential scanning calorimetry. The analytical conditions were examined and the enthalpy changes accompanied with the liberation of guest molecules were determined for these clathrates except the aniline one.
INFRARED SPECTRA OF C-FLUOROPHOSPHAETHYNE FC≡P AND C-DIFLUOROPHOSPHAETHENE CF2=PH
Authors: Ohno Keiichi , Matsuura Hiroatsu , Kroto Harold W , Murata Hiromu 
Published: July 2006

Abstract
The infrared spectra of gaseous CF3PH2 treated with KOH have been measured in the 2500–400 cm−1 region by a Fourier transform spectrometer. Most of the bands newly observed on the KOH treatment have been assigned to the vibrations of unstable species, C-fluorophosphaethyne FC≡P and C-difluorophosphaethene CF2=PH.
THE CATALYTIC STEAM GASIFICATION OF COAL USING SODIUM HYDRIDOTETRACARBONYLFERRATE
Authors: Suzuki Toshimitsu , Mishima Masaru , Kitaguchi Junji , Watanabe Yoshihisa 
Published: July 2006

Abstract
The catalytic steam gasification of Miike coal using hydridotetracarbonylferrates was investigated. Sodium hydridotetracarbonylferrate was found to be a much more effective catalyst than well known sodium carbonate catalyst especially at lower temperature (650∼700°C).
OXIDATIVE REMOVAL OF N-(p-METHOXYBENZYL) GROUP ON DIKETOPIPERAZINE SKELETON WITH CERIC AMMONIUM NITRATE
Authors: Yoshimura Juji , Yamaura Masanori , Suzuki Tsuneji , Hashimoto Hironobu 
Published: July 2006

Abstract
N-(p-Methoxybenzyl) groups in some diketopiperazine derivatives were proved to be readily and efficiently removed with ceric ammonium nitrate in acetonitrile-water under mild conditions, where N-benzyl , methoxyl in the aminal structure, and isolated vinyl groups remained unchanged.
ELECTROCHEMICAL ASYMMETRIC REDUCTION OF PROCHIRAL CARBONYL COMPOUNDS, OXIMES, AND A gem-DIHALIDE ON A POLY-l-VALINE-COATED GRAPHITE ELECTRODE
Authors: Abe Shigemitsu , Fuchigami Toshio , Nonaka Tsutomu 
Published: July 2006

Abstract
The electrochemical asymmetric reduction of prochiral carbonyl compounds, oximes, and a gem-dihalide was examined by using a poly-l-valine-coated graphite electrode. The highest asymmetric yield (16.6%) was obtained in the reduction of 1,1-dibromo-2,2-diphenylcyclopropane to the corresponding monobromocyclopropane.
(−)-HERBERTENEDIOL AND (−)-HERBERTENOLIDE, TWO NEW SESQUITERPENOIDS OF THE ENT-HERBERTANE CLASS FROM THE LIVERWORT HERBERTA ADUNCA
Authors: Matsuo Akihiko , Yuki Shunji , Nakayama Mitsuru 
Published: July 2006

Abstract
The structures of (−)-herbertenediol and (−)-herbertenolide, the new aromatic sesquiterpenoids with the ent-herbertane skeleton isolated from the liverwort Herberta adunca, have been determined on the basis of the chemical and spectral evidence.
THE EFFECT OF EXTERNAL MAGNETIC FIELD ON THE PHOTOINDUCED SUBSTITUTION REACTION OF 4-METHYLQUINOLINE-2-CARBONITRILE IN CYCLOHEXANE
Authors: Hata Norisuke , Nishida Naoya 
Published: July 2006

Abstract
The photoinduced substitution reaction of 4-methylquinoline-2-carbonitrile in cyclohexane was found to show an external magnetic field effect due to HFI and Δg mechanism. It was revealed that (i) the photoreaction occurs from the S1 state as well as T1 states and (ii) the triplet radical pair intermediate 2b is responsible for the observed magnetic field effect, whereas the singlet radical pair intermediate 2a is insensitive to an external magnetic field.
POLYMER-PROTECTED COPPER COLLOIDS AS CATALYSTS FOR SELECTIVE HYDRATION OF ACRYLONITRILE
Authors: Hirai Hidefumi , Wakabayashi Hidehiko , Komiyama Makoto 
Published: July 2006

Abstract
Stable colloidal dispersion of copper in water is prepared by the reduction of copper sulfate with sodium tetrahydroborate in the presence of poly(vinylpyrrolidone), poly(vinyl alcohol), dextrin, or poly(methyl vinyl ether). The poly(vinylpyrrolidone)-protected copper colloids are effective for the selective catalysis in hydration of acrylonitrile to acrylamide at 80°C in water.
THE EFFECTS OF THE NEIGHBORING METHOXYCARBONYL GROUP AND SULFUR ATOM(S) IN THE CARBON–SULFUR BOND CLEAVAGE AND THE ESTER EXCHANGE IN FLUORENE SYSTEMS
Authors: Nakanishi Waro , Nakanishi Hitoshi , Yanagawa Yuko , Ikeda Yoshitsugu , Oki Michinori 
Published: July 2006

Abstract
9,9-Bis(ethylthio)fluorene (1a) reacted with sodium ethanethiolate in methanol to give 9-ethylthiofluorene and diethyl disulfide suggesting that a C–S bond cleavage occurs by attack of a nucleophile at sulfur if a leaving group is sufficiently stable. The pseudo-first-order rate constans for the reaction of 1a and methoxycarbonyl-substituted 9-ethylthiofluorenes have suggested that the methoxycarbonyl group at 1-position exerts through space interaction with sulfur atom(s). The rate constants for ester exchange in 1-methoxycarbonylfluorene and its derivatives have been discussed on the ground of neighboring sulfur participation.
THE OXYGENATION OF α-ISOPHORONE AND ITS SILYL ENOL ETHER WITH t-BuOOH IN THE PRESENCE OF METAL CATALYSTS
Authors: Hosokawa Takahiro , Inui Shiro , Murahashi Shun-Ichi 
Published: July 2006

Abstract
Treatment of α-isophorone (1) with t-BuOOH in the presence of palladium(II) or copper(I) catalyst gives ketoisophorone (2) selectively. A similar treatment of silyl enol ether 7 derived from 1 affords 6-hydroxylisophorone 8.
A TOTAL SYNTHESIS OF 6″-EPIVALIDAMYCIN A AND ITS DIASTEREOMER
Authors: Ogawa Seiichiro , Inoue Makoto , Iwasawa Yoshikazu , Toyokuni Tatsushi , Suami Tetsuo 
Published: July 2006

Abstract
A total synthesis of the 6″-epimer of validamycin A and its diastereomer has been accomplished by a coupling reaction of the racemic peracyl 5,6-dihydroxy-1-hydroxymethyl-1,3-cyclohexadiene monoepoxide, the precursor of the unsaturated branched-chain cyclitol portion, with the protected β-d-glucopyranosylvalidamine, followed by acid hydrolysis and O-deacylation.
T1 ← S0 EXCITATION SPECTRUM OF 1,4-DICHLORONAPHTHALENE
Authors: Iwasaki Noriko , Nishi Nobuyuki , Kinoshita Minoru 
Published: July 2006

Abstract
A well-resolved T1 ← S0 excitation spectrum of 1,4-dichloronaphthalene has been obtained at 4.2 K. The frequency of one of the out-of-plane vibrations is found to be markedly reduced in the triplet state. This is discussed in terms of vibronic coupling in the triplet manifold.
NOVEL PHOTOREDUCTIVE ALKYLATION OF METHYL 4-PHENYLBENZOATE WITH ALIPHATIC TERTIARY AMINES
Authors: Tsujimoto Kazuo , Inaba Yoshihiro , Ohashi Mamoru 
Published: July 2006

Abstract
A photoinduced electron-transfer reaction of methyl 4-phenylbenzoate with triethylamine leads to an aminoketone (4), and a photoreductive ethylation product (2) which results from the Norrish Type II reaction of the aminoketone.
INFRARED STUDY OF AMMONIA AND PYRIDINE ADSORPTION ON V–Ti OXIDE
Authors: Miyata Hisashi , Nakagawa Yoshiro , Ono Takehiko , Kubokawa Yutaka 
Published: July 2006

Abstract
Adsorption of ammonia and pyridine on V–Ti oxide with a low vanadium content (2 and 5 wt%) has been studied by IR techniques. V–Ti oxide shows both Brønsted and Lewis acidities. The nature of both acid sites and the difference between the acidities determined from ammonia and pyridine adsorption have been discussed.
IMPROVEMENT OF SELECTIVITY FOR C2-OXYGENATED COMPOUNDS IN CO–H2 REACTION OVER TiO2-SUPPORTED Rh CATALYSTS BY DOPING ALKALI METAL CATIONS
Authors: Orita Hideo , Naito Shuichi , Tamaru Kenzi 
Published: July 2006

Abstract
The addition of alkali metal cations to TiO2-supported Rh catalysts improved the selectivity for C2-oxygenated compounds in CO–H2 reaction under atmospheric pressure. The dependences of the reaction rates on pretreatment conditions and reaction temperatures were also examined, which suggest that the active sites or the reaction path for the formation of acetaldehyde may be different from those for ethanol as well as hydrocarbons.
PREPARATION AND CHARACTERIZATION OF SOME RARE-EARTH COMPLEXES OF THE PHTHALOCYANINE RADICAL
Authors: Sugimoto Hiroshi , Higashi Teruaki , Mori Masayasu 
Published: July 2006

Abstract
The reaction of tris(2,2,6,6-tetramethyl-3,5-heptanedionato) complexes of rare-earth elements, M3+(dpm)3 (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) with lithium phthalocyanine Li2(Pc2−) in tetrahydrofuran gave new stable phthalocyanine radical complexes [M3+(Pc−·)(dpm)2].
19-METHYL vs. 18-METHYL GROUP MIGRATION IN THE REARRANGEMENT OF 3β-ACETOXY-9α,11α-EPOXY-5α-LANOSTAN-7-ONE
Authors: Paryzek Zdzislaw , Wydra Roman , Blaszczyk Krzysztof 
Published: July 2006

Abstract
BF3·Et2O-catalyzed rearrangement of the keto-epoxide (1b) was found to be a complex reaction leading to compounds (2), (4), and (5) having the rearranged carbon skeletons; spectral and chemical evidences are presented to confirm their structures.
A NOVEL PROCEDURE FOR THE PREPARATION OF 1-OH SUGAR DERIVATIVES USING 2-METHOXYETHYL GLYCOSIDES
Authors: Morishima Naohiko , Koto Shinkiti , Kanemitsu Kumi , Zen Shonosuke 
Published: July 2006

Abstract
Treatment of benzyl-protected 2-methoxyethyl glycopyranosides with titanium tetrachloride followed by hydrolysis provides a new method for the preparation of the corresponding 1-OH sugar derivatives. The present method is shown to be useful for the preparation of mono-O-acetyl- and mono-O-allyl-tri-O-benzyl-d-glucopyranoses.
FORMAL SYNTHESIS OF (±)-IPALBIDINE
Authors: Iida Hideo , Watanabe Yohya , Kibayashi Chihiro 
Published: July 2006

Abstract
1-Aza-3-(4-methoxyphenyl)bicyclo[4,3,0]nonan-4-one, key intermediate to (±)-ipalbidine, was conveniently synthesized by intramolecular cyclization of the N-formyIketone which was obtained via [3 + 2] cycloaddition reaction of the cyclic nitrone.
REACTIONS OF SILYLENES WITH 1,4-DIPHENYL-1,3-BUTADIENE AND 1-METHYL-1,2,3,4,5-PENTAPHENYLSILOLE. A NOVEL SILYLENE-SILYLENE EXCHANGE REACTION
Authors: Sakurai Hideki , Kobayashi Yoshiteru , Sato Ryuji , Nakadaira Yasuhiro 
Published: July 2006

Abstract
Thermally generated dimethylsilylene reacts with 1,4-diphenyl-1,3-butadiene to give 1,1-dimethyl-4,5-diphenyl-1-silacyclo-2-pentene. A mechanism involving homolytic C–C bond cleavage of the intermediate vinylsilacyclopropane is suggested. Dimethylsilylene also undergoes a novel silylene–silylene exchange reaction with 1-methyl-1,2,3,4,5-pentaphenylsilole.
EFFECTIVE ASYMMETRIC HYDROGENATION OF DEHYDRODIPEPTIDES WITH RHODIUM(I)-NEW CHIRAL DIPHOSPHINITE SYSTEMS
Authors: Yatagai Masanobu , Zama Masanobu , Yamagishi Takamichi , Hida Mitsuhiko 
Published: July 2006

Abstract
Rh(I)-new chiral diphosphinite systems with terminal amino groups were very effective for asymmetric hydrogenation of dehydrodipeptides with free carboxyl group and a chiral carbon. The effectiveness of the diphosphinite catalysts strongly suggests the contribution of electrostatic effect to asymmetric induction.
A CHELATE RING SIZE EFFECT ON SPIN STATES OF IRON(III) COMPLEXES WITH HEXADENTATE LIGANDS DERIVED FROM SALICYLALDEHYDE AND 4,8-DIAZAUNDECANE-1,11-DIAMINE(3,3,3-tet) OR 4,7-DIAZADECANE-1,10-DIAMINE(3,2,3-tet), AND THEIR X-RAY STRUCTURES
Authors: Ito Tasuku , Sugimoto Masako , Ito Haruko , Toriumi Koshiro , Nakayama Hiroaki , Mori Wasuke , Sekizaki Masao 
Published: July 2006

Abstract
High- and low-spin Fe(III) complexes with the titled ligands, [Fe(Sal23,3,3-tet)](NO3) (S=5/2) (1) and [Fe(Sal23,2,3-tet)](NO3) (S=1/2) (2), have been synthesized. X-ray analyses for 1 and 2 show that, in each complex, the metal environment is pseudo octahedral with the two O atoms being trans. Difference of one CH2 group in the methylene chain of the ligand causes a copmlete change in the spin state without changing coordination gemetries. In methanol, 2 is essentially low spin with μeff=1.95 BM(263.5 K), whereas 1 exhibits the behavior for the spin equilibrium [μeff=3.00(244.5 K)–4.04(305.5 K) BM]. The equilibrium constant of 1, K = [low-spin]/[high-spin]=2.6±0.9 at 25 °C and ΔH = −11.8±2.5 kJ mol−1 were obtained from detailed analyses of the temerature dependent electronic spectra.
MÖSSSBAUER SPECTROSCOPIC AND ELECTROCHEMICAL STUDIES ON 1′,1'″-DIHALOBIFERROCENES
Authors: Motoyama Izumi , Suto Kyoko , Katada Motomi , Sano Hirotoshi 
Published: July 2006

Abstract
In the Mössbauer spectroscopic studies on the triiodide salts of a series of 1′,1'″-dihalobiferrocenes, it has been found that the monocations of diiodo- and dibromobiferrocene show averaged valence states of iron atoms, while the monocation salt of dichlorobiferrocene shows a trapped valence state of iron atoms. On the other hand, no difference has been found in the half-wave potentials of the halobiferrocenes.
ASYMMETRIC HYDROGENATIONS OF N-PYRUVOYL-(S)-AMINO ACID ESTERS BY USING SODIUM BOROHYDRIDE. A SOLVENT EFFECT
Authors: Munegumi Toratane , Harada Kaoru 
Published: July 2006

Abstract
N-Pyruvoyl-(S)-amino acid isobutyl esters were hydrogenated with sodium borohydride(NBH) in several alcoholic solvents, and N-[(R)-lactoyl]-(S)-amino acid esters were obtained with diastereoisomeric purity of up to 44%. Significant solvent effect on the diastereoisomeric purity of the product was observed.
HEXACARBONYLMOLYBDENUM-INDUCED FORMATION OF PYRIDINES FROM ISOXAZOLES AND ACETYLENIC ESTER
Authors: Kobayashi Tomoshige , Nitta Makoto 
Published: July 2006

Abstract
Upon treatment with Mo(CO)6 in anhydrous benzene, substituted isoxazoles undergo a novel inclusion of dimethyl acetylenedicarboxylate across the C4–C5 bond and loss of an oxygen atom to lead to pyridines.
PHOTOCYCLOADDITION OF 4-METHOXYQUINOLIN-2(1H)-ONE AND RELATED COMPOUNDS TO ALLENE: SYNTHESIS OF 1-METHYLENE-1,2-DIHYDROCYCLOBUTA[c]QUINOLIN-3(4H)-ONE AND RELATED COMPOUNDS
Authors: Kaneko Chikara , Shimomura Naoyuki , Momose Yu , Naito Toshihiko 
Published: July 2006

Abstract
Photocycloaddition of 4-methoxy-2-pyridones and -quinolones to allene gives the head-to-tail adduct as the predominant product, which by base treatment affords the title compounds.
CATALYTIC HYDROGENATION OF 7-METHYLBICYCLO [3.3.1]NON-6-EN-3-ONE. ANOMALOUSLY HIGH SELECTIVITIES ON Pd AND Co BLACK CATALYSTS
Authors: Ishiyama Jun-ichi , Senda Yasuhisa , Imaizumi Shin 
Published: July 2006

Abstract
Anomalously high selectivities on Pd and Co black catalysts were observed in the catalytic hydrogenation of 7-methylbicyclo[3.3.1]non-6-en-3-one. Unexpected products, 1-adamantanol and 6-methylbicyclo[3.3.1]non-6-en-3-endo-ol were exclusively produced over Pd and Co, respectively.
SIMPLE AND CHEMOSELECTIVE SYNTHESIS OF KETONES FROM CARBOXYLIC ACIDS AND GRIGNARD REAGENTS USING DICHLOROTRIPHENYLPHOSPHORANE
Authors: Fujisawa Tamotsu , Iida Sachio , Uehara Hiroshi , Sato Toshio 
Published: July 2006

Abstract
Dichlorotriphenylphosphorane was found to be a good condensation reagent for synthesis of ketones from carboxylic acids and Grignard reagents under mild conditions. Synthetic utility of the present method is demonstrated by the chemoselective reaction of carboxylic acids possessing such a functional group as halogen, cyano, or carbonyl.
THE ALKYLATION AND BASE-PROMOTED RING-OPENING REACTION OF 3-PHENYLSULFONYL-3-TRIMETHYLSILYLCYCLOBUTANOLS. A NEW METHOD FOR THE PREPARATION OF β-METHYLENE KETONES
Authors: Takeda Takeshi , Ando Kazuo , Fujiwara Tooru 
Published: July 2006

Abstract
β-Methylene ketones were produced by the alkylation of 1-alkyl-3-phenylsulfonyl-3-trimethylsilylcyclobutanols followed by the treatment with potassium hydride.
DIMER FORMATION OF COPPER(II) PEPTIDE COMPLEXES IN AQUEOUS SOLUTION AS STUDIED BY ESR
Authors: Yokoi Hiroshi , Hanaki Akira 
Published: July 2006

Abstract
It has been first revealed by ESR spectroscopy that copper(II) peptide complexes form dimers in aqueous solutions, if they have two or more deprotonated peptide nitrogens, and that this dimer formation is quite similar in many respects to the dimerization or self-association of porphyrins, metal porphyrins, nucleotides, dyes, and some aromatic heterocycles in aqueous solutions. Computer simulation of the dimer ESR spectra has shown that the dimers of the above peptide complexes are of a parallel planar type; two coordination planes in most of them lie almost right above each other with the separation of ≈4 Å.
A CONVENIENT PREPARATION OF Z-STYRYL, Z,Z- AND E,Z-DISTYRYL SULFIDES IN LIQUID AMMONIA
Authors: Takikawa Yuji , Shimada Kazuaki , Matsumoto Hisaya , Tanabe Hitoshi , Takizawa Saburo 
Published: July 2006

Abstract
Nucleophilic attack of thiols on phenylacetylene (1) in liquid ammonia at room temperature gave the corresponding Z-isomer of styryl sulfides in high yield stereoselectively. Reaction of 1 with Na2S also proceeded selectively to give Z,Z-distyryl sulfide (12). On the other hand, reaction with NaSH gave 12 besides E,Z-isomer as a minor product.
REDUCTION OF AROMATIC AND ALIPHATIC NITRO COMPOUNDS BY SODIUM HYDROGEN TELLURIDE
Authors: Osuka Atsuhiro , Shimizu Hirohito , Suzuki Hitomi 
Published: July 2006

Abstract
Various nitro compounds were effectively reduced by sodium hydrogen telluride in good yields. Thus, reductive conversion of unhindered nitrobenzenes to azoxybenzenes, sterically hindered nitrobenzenes to anilines, nitroalkanes to dimer of nitrosoalkanes, and vicinal-dinitroalkane to olefin was achieved.
FLUORIDE ION INDUCED TERMINAL OLEFIN SYNTHESIS FROM β-HYDROXYALKYLPHOSPHONATES
Authors: Kawashima Takayuki , Ishii Takafumi , Inamoto Naoki 
Published: July 2006

Abstract
β-Hydroxyalkylphosphonates, prepared readily from alkylphosphonates and carbonyl compounds, were treated with a fluoride ion to give the corresponding olefins in fairly good yields. Use of CsF in N,N-dimethylformamide gave the best result.
A SIMPLE STEREOSELECTIVE SYNTHESIS OF (lR,3R,5S)-1,3-DIMETHYL-2,9-DIOXABICYCLO[3,3,1]NONANE USING REGIOSELECTIVE RING-OPENING OF (R)-β-METHYL-β-PROPIOLACTONE
Authors: Sato Toshio , Itoh Toshiyuki , Hattori Chihiro , Fujisawa Tamotsu 
Published: July 2006

Abstract
A facile stereoselective synthesis of (1R,3R,5S)-1,3-dimethyl-2,9-dioxabicyclo[3.3.1]nonane was achieved from (R)-2-hydroxy-7-octen-4-one, which was easily prepared by the copper-catalyzed reaction of (R)-β-methyl-β-propiolactone with vinylmagnesium bromide.
HIGHLY CONDUCTIVE POLY(CARBON DISELENIDE)
Authors: Kobayashi Hayao , Mori Takehiko , Kato Reizo , Kobayashi Akiko , Sasaki Yukiyoshi , Saito Gunzi , Inokuchi Hiroo 
Published: July 2006

Abstract
Crystalline poly(carbon diselenide) has been revealed to be a highly conductive material. The room-temperature resistivity is 0.06 Ω cm. The thermoelectric power is as small as those of normal metals. The X-ray photograph showed a sharp powder diffraction pattern.
NEW SYNTHESIS OF CYCLOPENTENOL AND SPIRO[4.5]DECANOL DERIVATIVES VIA INTRAMOLECULAR PHOTO-OXETANE FORMATION
Authors: Kim Tong Hei , Hayase Yoshio , Isoe Sachihiko 
Published: July 2006

Abstract
Cyclopentenol and spiro[4.5]decanol derivatives accessible to natural products were synthesized in moderate yield by the irradiation of olefinic β-keto esters followed by treatment with sodium hydride.
A KINETIC STUDY OF REDUCTION OF BOVINE ERYTHROCYTE SUPEROXIDE DISMUTASE WITH POTASSIUM HEXACYANOFERRATE(II)
Authors: Hirose Junzo , Ueoka Mayumi , Tsuchiya Tamami , Nakagawa Mikiko , Noji Masahide , Kidani Yoshinori 
Published: July 2006

Abstract
When the two copper ions at the active sites of bovine erythrocyte superoxide dismutase were reduced by Fe(CN)64−, a single stage kinetic process was observed. This result indicates that the two copper sites in bovine erythrocyte superoxide dismutase are equivalent for reduction by Fe(CN)64−.
A HIGH RESOLUTION 13C NMR STUDY OF SOLID POLY (β-BENZYL-l-ASPARTATE) BY THE CROSS POLARIZATION-MAGIC ANGLE SPINNING METHOD. DISTINCTION OF THE RIGHT-HANDED α-HELIX, LEFT-HANDED α-HELIX, ω-HELIX, AND β-SHEET FORMS BY CONFORMATION-DEPENDENT 13C CHEMICAL SHIFTS
Authors: Saitô Hazime , Tabeta Ryoko , Ando Isao , Ozaki Takuo , Shoji Akira 
Published: July 2006

Abstract
High resolution 13C NMR spectra of solid poly(β-benzyl-l-aspartate) taking the right-handed α-helix, left-handed α-helix, ω-helix, and β-sheet conformations were recorded by the cross polarization-magic angle spinning method. 13C chemical shifts of the right-handed α-helix form were significantly displaced as compared with those of the left-handed α-helix and ω-helix forms.
RADIATION-INDUCED REDUCTIVE CONVERSION OF 5-BROMO-6-HYDROXYTHYMINE TO THYMINE PROMOTED BY TRANSITION METAL SALTS IN DEAERATED AQUEOUS SOLUTION
Authors: Nishimoto Sei-ichi , Ide Hiroshi , Nakamichi Kikumi , Otsuki Nobuaki , Kagiya Tsutomu 
Published: July 2006

Abstract
The radiation-induced reduction of 5-bromo-6-hydroxythymine to produce thymine (2) in deaerated aqueous solution was remarkably promoted by the addition of lower-valent transition metal salts (K4Fe(CN)6 (3a), CuCl (3b), K2PtCl6 (3c), and FeSO4(3d)). It is suggested that the possible intermediate hydroxythymine-5-yl radical undergoes one-electron reduction by 3a-d to the corresponding anion which eliminates OH− to produce 2.
1,2,4-TRINITROBENZENE AS A THIOL REAGENT
Authors: Takahashi Seitaro , Kokubo Masayuki , Satake Kazuo 
Published: July 2006

Abstract
The 2,4-dinitrophenylation of thiol or amino group with 1,2,4-trinitrobenzene proceeded quantitatively at pH 8.5 and 30 °C. The rate of S-dinitrophenylation was ≈104 times faster than that of N-dinitrophenylation. So this reaction can be used for both the determination of thiol even in the presence of large excess amine and the specific modification of thiol in proteins.
MERCURY(II) TRIFLATE—AMINE COMPLEX-INDUCED CYCLIZATION OF GERANYLGERANYL p-NITROBENZOATE: SYNTHESIS OF SPONDIAN AND LABDANE DITERPENOIDS
Authors: Nishizawa Mugio , Takenaka Hideyuki , Hayashi Yuji 
Published: July 2006

Abstract
Biomimetic cyclization of geranylgeranyl p-nitrobenzoate by the mercury(II) triflate—N,N-dimethylaniline complex and subsequent reductive demercuration provide a tricyclic and two bicyclic diterpenoids in moderate yields. This is the first example of the cyclization of geranylgeraniol to the tricyclic diterpene.
STEREOSELECTIVE TOTAL SYNTHESES OF (±)- AND OPTICALLY ACTIVE DEHYDROIRIDODIOLS
Authors: Nakayama Mitsuru , Ohira Susumu , Takata Seishi , Fukuda Kenzo 
Published: July 2006

Abstract
(±)-Dehydroiridodiol and its epimer (±)-isodehydroiridodiol were synthesized stereoselectively using the homoconjugate addition of cyanide anion to methyl 6-methyl-2-oxobicyclo[3.1.0]hexane-1-carboxylates. Both enantiomers of dehydroiridodiol were prepared after the resolution of l-menthyl 6-methyl-2-oxobicyclo[3.1.0]hexane-1-carboxylate, whose absolute configurations became clear as the result.