bluuebunny/crossref_metadata_2025 huggingface dataset:
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

(±)-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.
PROMOTION EFFECT OF 2,2,6,6-TETRAMETHYLPIPERIDINE-1-OXYLS ON THE RADIOLYTIC HYDROXYLATION OF THYMINE IN DEAERATED AQUEOUS SOLUTION
Authors: Kagiya Tsumotu , Kimura Ryoji , Komuro Chikara , Sakano Koichi , Nishimoto Sei-ichi
Published: July 2006

Remarkable promation of the hydroxylation of thimine to give thimine glycol with almost complete depression of side reactions by 2,2,6,6-tetramethylpiperidine-1-oxyl (TMPO·) derivatives was observed in the γ-radiolyses of the N2- and N2O-saturated aqueous solutions. In the O2-saturated solution, TMPO· depressed the thymine conversion close to the level under N2 while promoted the formation of thymine glycol to some extent by decreasing side reactions.
A CONVENIENT SYNTHESIS OF α-BROMOKETONES FROM OLEFINS
Authors: Kageyama Toshifumi , Tobito Yoshimichi , Katoh Atsushi , Ueno Yoshio , Okawara Makoto
Published: July 2006

α-Bromoketones are prepared in good yields by the reaction of olefins with sodium bromite in aqueous acetic acid at room temperature.
DIRECT CONDENSATION OF POLYHYDRIC PHENOLS WITH GLUCOSE
Authors: Onodera Jun-ichi , Takano Mltsuru , Kishi Yuji , Yokoyama Noriko , Ishida Ryosuke
Published: July 2006

Acid-catalyzed direct condensation reaction of polyhydric phenols with free glucose in DMSO gave O-α-d-glucopyranoside in preference to its β-anomer; however, phloroglucinol and phloroacetophenone gave C-β-d-glucopyranoside instead.
DIRECT PHOTOLYSIS AT 185 nm OF SIMPLE CYCLOBUTENES. MOLECULAR ELIMINATION OF ACETYLENE
Authors: Inoue Yoshihisa , Sakae Mitsuhiro , Hakushi Tadao
Published: July 2006

Direct photolyses at 185 nm of bicyclo[3.2.0]hept-6-ene and bicyclo[4.2.0]oct-7-ene in pentane afforded acetylene and the fragment cycloalkenes as the major photoproducts, whereas the Woodward-Hoffmann allowed ring-opening giving rise to 1,3-diene was a minor process.
REACTIONS OF 2,4,6-TRIARYL-DIHYDRO-1,3,5-DITHIAZINES WITH ELECTROPHILIC REAGENTS
Authors: Takikawa Yuji , Shimada Kazuaki , Makabe Takahiro , Takizawa Saburo
Published: July 2006

2,4,6-Triaryl-dihydro-1,3,5-dithiazines reacted with electrophilic reagents such as p-TsOH·H2O, CF3COOH, HCl, and BF3·OEt2 under reflux in CH3CN to afford α-2,4,6-triaryl-1,3,5-trithianes and β-isomers (3a-d) in good yields. Reactions with I2 gave selectively 3a-d in high yields, while with ICl or IBr gave 3a-d and p-substituted benzylideneamine·HY.
A NEW TYPE OF CYLINDRICAL MACROCYCLIC POLYETHERS, SYNTHESIS AND CATION-COMPLEXING ABILITY OF DIDECALINO- AND DECALINO-CYCLOHEXANO-18-CROWN-6
Authors: Kobiro Kazuya , Tanaka Yoshihiro , Okubo Kazuma , Hiramatsu Yasuhiro , Kakiuchi Kiyomi , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

Didecalino- and decalino-cyclohexano-18-crown-6, being a new type of cylindrical macrocyclic polyethers, have been synthesized and found to exhibit excellent complexing abilities toward potassium and sodium cations.
A NOVEL CYCLISATION REACTION OF ALKYLTHIODIPHENYLCYCLOPROPENIUM IONS WITH 1,3-DIKETONES TO GIVE CYCLOPENTADIENOLS
Authors: Yoshida Hiroshi , Nakajima Mikito , Ogata Tsuyoshi , Matsumoto Kiyoshi , Acheson R Morrin , Wallis John D
Published: July 2006

Alkylthiodiphenylcyclopropenium ions reacted with 2,4-pentanedione or ethyl acetoacetate to give cyclopentadienol derivatives by ring expansion, while triphenylcyclopropenium perchlorate yielded substituted cyclopropenes.
SOME CARBANIONIC REACTIONS OF α-CHLOROALLYL SULFONES
Authors: Jonczyk Andrzej , Radwan-Pytlewski Tadeusz
Published: July 2006

The chlorination of 3-methyl-2-butenyl phenyl sulfone with either hexachloroethane or 1,1-dichloro-3-methyl-2-butenyl phenyl sulfone in basic medium gives rise to 1-chloro-3-methyl-2-butenyl phenyl sulfone which in turn reacts in situ with electrophilic compounds to give a variety of products in good yields.
CASTING OF SYNTHETIC BILAYER MEMBRANES ON GLASS AND SPECTRAL VARIATION OF MEMBRANE-BOUND CYANINE AND MEROCYANINE DYES
Authors: Nakashima Naotoshi , Ando Reiko , Kunitake Toyoki
Published: July 2006

Cast films were prepared on glass from aqueous dispersions of double-chain ammonium amphiphiles. The bilayer characteristics were preserved and specific spectral variations were observed for film-bound cyanine and merocyanine dyes.
PHOTOCHEMICAL REACTIONS OF N,N-DIALKYL α-OXOAMIDES ADSORBED ON SILICA GEL AND ALUMINA
Authors: Aoyama Hiromu , Miyazaki Ken-ichi , Sakamoto Masami , Omote Yoshimori
Published: July 2006

The photochemical reactions of N,N-dialkyl α-oxoamides adsorbed on silica gel were similar to those in acidic methanol, which indicated that the acidity of silanol groups on the surfaces of silica gel played important roles. The photolysis of the amides on alumina resembled those in methanol. The results of the photoreactions also suggested the absence of strong constraint upon the molecular motions of the amides adsorbed on these adsorbents.
ENANTIOSPECIFIC SYNTHESIS OF NATURAL (+)-(S,S)-(CIS-6-METHYLTETRAHYDROPYRAN-2-YL)ACETIC ACID, A CONSTITUENT OF CIVET
Authors: Masaki Yukio , Serizawa Yuzuru , Nagata Kinnosuke , Kaji Kenji
Published: July 2006

(+)-(S,S)-(cis-6-Methyltetrahydropyran-2-yl)acetic acid, a constituent of the glandular secretion from the civet cat was synthesized enantiospecifically from (+)-(R,R)-diethyl tartrate via stereospecific reductive ring opening of an optically active 5,7-disubstituted 6,8-dioxabicyclo[3.2.1]octane derivative.
FACILE DEIMINATION OF SULFIMIDES AND SULFODIIMIDES WITH ELEMENTAL SULFUR CATALYZED OR UNCATALYZED BY AMINES
Authors: Sato Ryu , Saito Nobushige , Saito Minoru
Published: July 2006

Sulfimides and sulfodiimides were readily deiminated with elemental sulfur catalyzed or uncatalyzed by amines affording corresponding sulfides and its derivatives under mild conditions in excellent yields.
NEW ELEMANOLIDES FROM ZINNIA SPECIES: STRUCTURAL REVISION OF THE ZINNOLIDES
Authors: Ortega Alfredo , Vivar Alfonso Romo De , Toscano Rubén A , Maldonado Emma
Published: July 2006

A study of Zinnia peruviana afforded the new elemanolides zinaflorin IV and zinaflorin V. An X-ray crystallographic analysis of zinaflorin IV established its structure and stereochemistry as belonging to the rather unusual group of C14α, H5β elemanolides.

The generic name zinnolides is proposed for the elemanolides possessing the same relative configuration around the six member ring as that of zinaflorin IV.
THE SMSI EFFECT ON THE ACTIVITY OF CO HYDROGENATION OVER Nb2O5-SUPPORTED Rh CATALYSTS
Authors: Kunimori Kimio , Abe Hiroshi , Uchijima Toshio
Published: July 2006

In contrast to the case of the TiO2-supported systems, the activities of CO hydrogenation on Rh/Nb2O5 catalysts in the SMSI state were two orders of magnitude lower than in the normal state. The product selectivity appeared to be similar between the normal and SMSI states, but to depend on the metal particle size.
EXCIMER FORMATION IN THE CAVITY OF γ-CYCLODEXTRIN APPENDED BY A NAPHTHALENE MOIETY
Authors: Ueno Akihiko , Tomita Yoko , Osa Tetsuo
Published: July 2006

γ-Cyclodextrin appended by a naphthalene moiety forms an excimer with naphthalene in its cavity. The addition of 1-borneol causes a decrease in the excimer emission as a result of replacement of the included naphthalene by 1-borneol.
A NEW EFFICIENT SYNTHESIS AND REARRANGEMENTS OF [6]PARACYCLOPHANE
Authors: Tobe Yoshito , Ueda Ken-ichi , Kakiuchi Kiyomi , Odaira Yoshinobu
Published: July 2006

[6]paracyclophane (1) has been synthesized by oxidative decarboxylation of [6.2.2]propellenecarboxylic acid with lead tetraacetate. Vapor phase thermolysis of 1 affords 3-methylene-spiro[5.5]undeca-1,4-diene predominantly, while acid-catalyzed rearrangement of 1 gives the meta and ortho isomers in a ratio of 1:3.
ISOLATION AND CHARACTERIZATION OF STABLE ALKYLIDENEPHOSPHINES
Authors: Yoshifuji Masaaki , Toyota Kozo , Shibayama Katsuhiro , Inamoto Naoki
Published: July 2006

E and Z-P-α- (t-Butyldimethylsilyloxy)benzylidene(2,4 ,6-tri-t-butylphenyl)phosphines were isolated as stable compounds.
CATALYTIC ACTIVITY OF Co-TETRAPHENYLPORPHYRIN SUPPORTED ON TiO2 COMPARABLE TO HOPCALITES FOR THE OXIDATION OF CARBON MONOXIDE AT ROOM TEMPERATURE
Authors: Mochida Isao , Suetsugu Katsuya , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

Molecular oxygen oxidized carbon monoxide at 17 °C over Co-TPP-TiO2 by the rate of 5.3×10−3mmol/gcat·min which was comparable to that of a commercial Hopcalite, indicating very effective activation of carbon monoxide on the partially reduced Co ion of the supported complex to attract an oxygen atom from weakly adsorbed molecular oxygen.
EXCITATION SPECTRA OF HEAT-TREATED POLY(VINYL ALCOHOL) FILM
Authors: Maruyama Kazunori , Akahoshi Hiroshi , Kobayashi Michio , Tanizaki Yoshie
Published: July 2006

Among species of general structure (\( \llap–CH=CH \llap–)\)n produced in the heat-treated PVA substrate, the existence of polyene systems with n=2 to 5 were successfully confirmed by means of the excitation spectra and the Lewis–Calvin’s plot.
CATALYTIC ACTIVITIES OF METAL ION EXCHANGED FORMS OF FLUORO TETRASILICIC MICA FOR THE REACTION OF BUTENES
Authors: Morikawa Yutaka , Yasuda Akio , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

Metal ion exchanged forms of fluoro tetrasilicic mica (Mn+-TSM’s) showed characteristic activities of the exchanged Mn+ ions for the reaction of butenes. It is of particular interest that Sn4+- and Fe3+-TSM catalyze the dehydrogenation of butenes to form butadiene in either absence or presence of hydrogen.
SYNTHESES OF THE A RING ANALOGS OF TRIPTOLIDE AND TRIPDIOLIDE
Authors: Tokoroyama Takashi , Kondo Akihiro , Ezaki Yoichiro
Published: July 2006

The synthesis of an A ring analog of tripdiolide as well as revised procedures for the synthesis of a triptolide analog (isodehydroabietenolide) from dehydroabietic acid via the previously reported intermediate is described.
A NEW SYNTHETIC METHOD OF 1-AZABICYCLO[4.n.0]SYSTEMS
Authors: Shono Tatsuya , Matsumura Yoshihiro , Tsubata Kenji , Inoue Kenji , Nishida Ryoichi
Published: July 2006

A new method for the synthesis of bicyclic pyridinium salts from alicyclic amines and reduction of the salts to 1-azabicyclo[4.n.0]systems has been exploited.
MOESSBAUER SPECTRA OF IRON IN GLASS PREPARED BY THE GEL FORMATION REACTION OF WATER GLASS
Authors: Uetake Naohito , Kikuchi Makoto
Published: July 2006

The gel formed by the reaction of water glass and Fe3+ ion was dried at 150°C and the chemical state of iron was analyzed using Moessbauer spectroscopy as a function of heating temperature. Moessbauer spectra of these samples showed a well-resolved quadrupole-split doublet. The Moessbauer parameters indicated that iron entered into the silicate lattice as tetrahedrally coodinated Fe3+. These results suggested that Fe3+ ion reacted with silicate molecules in the water glass solution in the process of gel formation.
TWO-GUEST INCLUSION COMPLEX OF γ-CYCLODEXTRIN WITH CHLORPROMAZINE
Authors: Takamura Kiyoko , Inoue Satoshi , Kusu Fumiyo
Published: July 2006

The interaction of chlorpromazine with γ-cyclodextrin in an aqueous solution was studied by circular dichroism and 1H-NMR. γ-Cyclodextrin was found to form a 1:2 inclusion complex with chlorpromazine at a concentration higher than ca. 1×10−4mol·l−1. The two chlorpromazine molecules including in γ-cyclodextrin may have S-helicity.
SONOLUMINESCENCE FOR WATER DETERMINATION
Authors: Yamada Masaaki , Hobo Toshiyuki , Suzuki Shigetaka
Published: July 2006

Sonoluminescence, ultrasonically induced luminescence, is described for the determination of water in methanol. It is based on the measurement of emissions from OH*, H2O*, etc. produced when ultrasonic waves is propagated through methanol containing water. The method is unique in capable of determining water with no use of reagents.
PROPERTIES OF Na2SO4 DOPED WITH NaVO3 AND Pr2(SO4)3 AS A SOLID ELECTROLYTE
Authors: Imanaka Nobuhito , Adachi Gin-ya , Shiokawa Jiro
Published: July 2006

Sodium sulfate doped with both sodium vanadate and praseodymium sulfate has been investigated as solid electrolyte for SO2 detecting device. Na2SO4–NaVO3–Pr2(SO4)3(91.1:3.9:5.0) shows higher electric conductivity than pure Na2SO4. The measured EMF for an SO2 concentration cell using this electrolyte is in good accord with the calculated one. NaVO3 stabilizes a high temperature phase, Na2SO4–I.
A CONVENIENT METHOD FOR THE PREPARATION OF 4,6-O-BENZYLIDENEGLYCALS FROM METHYL 2,3-ANHYDRO-4,6-O-BENZYLIDENE-α-d-HEXOPYRANOSIDES
Authors: Tsuda Nobuo , Yokota Sumio , Kudo Takashi , Mitsunobu Oyo
Published: July 2006

The reaction of methyl 2,3-anhydro-4,6-O-benzylidene-α-d-allopyranoside (l) with ethylmagnesium bromode in the presence of CuI afforded 4,6-O-benzylidene-1,2-dideoxy-d-rlbo-hex-1-enopyranoside (2), Similarly, methyl 2,3-anhydro-4,6-O-benzylidene-α-d-gulopyranoside (6) gave 4,6-O-benzylidene-1,2-dideoxy-d-xylo-hex-1-enopyranoside (7).
FACILE METHOD FOR THE ACYLATION OF ALCOHOLS AND AMIDES BY THE USE OF 1,1′-DIMETHYLSTANNOCENE AND ACYL CHLORIDES
Authors: Mukaiyama Teruaki , Ichikawa Junji , Asami Masatoshi
Published: July 2006

Acylation of alcohols and amides was effected under mild conditions by the use of 1,1′-dimethylstannocene and acyl chlorides, giving the corresponding esters and imides in good to excellent yields.
AN ALDOL-TYPE REACTION OF ACTIVE METHYL GROUPS OF NITROGEN-CONTAINING HETEROAROMATIC COMPOUNDS
Authors: Hamana Hiroshi , Sugasawa Tsutomu
Published: July 2006

Active methyl groups of nitrogen-containing heteroaromatic compounds react with benzaldehydes in the presence of 9-BBN triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products under mild conditions.
PHOTODECARBOXYLATION OF PYRIDOXAL-α-AMINO ACID SCHIFF BASES. INTERMEDIATE SPECIES INDUCED BY FLASH EXCITATION
Authors: Kurauchi Yoshiaki , Ohga Kazuya , Morita Shigeru , Nagamura Toshihiko , Matsuo Taku
Published: July 2006

Pyridoxal Schiff bases of α-amino acids, phenylalanine and α-aminoisobutyric acid underwent photochemical decarboxylation in methanol to give pyridoxamine and carbonyl compounds after hydrolysis. Flash photolysis of the Schiff bases induced transient absorptions which were assigned to the decarboxylated quinonoid intermediates.
PREPARATION AND CHARACTERIZATION OF UNSYMMETRICAL BIS(BENZOCROWN ETHER)S : PREFERENTIAL COMPLEXATION WITH RUBIDIUM CATION
Authors: Ikeda Toshihiko , Abe Akito , Kikukawa Kiyoshi , Matsuda Tsutomu
Published: July 2006

New unsymmetrical and pseudo-symmetrical bis(benzocrown ether)s (3, 4, and 5) were synthesized. The unsymmetrical crown ether 3 showed preferential complexation with Rb+ over other alkali metal cations in solvent extraction (CH2CL2–H2O) and in the behaviour as PVC membrane electrode, as compared to 4 and 5.
ULTRASONIC ACCELERATION OF OXIDATION WITH SOLID POTASSIUM PERMANGANATE
Authors: Yamawaki Junko , Sumi Shinjiro , Ando Takashi , Hanafusa Terukiyo
Published: July 2006

Ultrasonic irradiation facilitates heterogeneous oxidation of secondary alcohols to ketones with solid potassium permanganate in nonpolar organic solvents.
AN ASYMMETRIC SYNTHESIS OF BICYCLIC LACTONES AND ITS APPLICATION TO THE ASYMMETRIC SYNTHESIS OF (1R,3S)-CIS-CHRYSANTHEMIC ACID
Authors: Mukaiyama Teruaki , Yamashita Hiroyuki , Asami Masatoshi
Published: July 2006

Optically active bicyclic lactones are synthesized from ircides, derived from (R)-(−)-2-amino-2-phenylethanol and meso-cyclic-1,2-cis-dicarboxylic acids, by successive treatment with sodium bis(2-methoxyethoxy)aluminum hydride and sodium borohydride, followed by acid hydrolysis. This reaction is successfully applied to the asymmetric synthesis of (1R,3S)-cis-chrysanthemic acid.
AN INTERPRETATION OF THE SUBSTITUENT EFFECT IN THE BLAISE REARRANGEMENT IN TERMS OF PI-ORBITALS
Authors: Abe Yukio , Suehiro Tadashi
Published: July 2006

The migratory aptitude of the substituent groups in the Blaise rearrangement can be explained in terms of the pi-electronic properties of the groups in the highest occupied molecular orbitals. The rates of the rearrangement reaction with relation to the substituent groups were also rationally understood based on the energy levels of the molecular orbitals.
CONVENTIONAL MEASUREMENTS OF SPECTRAL LINE PROFILES FROM HOLLOW CATHODE LAMPS AND INDUCTIVELY COUPLED ARGON PLASMA BY A WAVELENGTH-MODULATION ECHELLE MONOCHROMATOR
Authors: Hasegawa Tetsuya , Haraguchi Hiroki , Fuwa Keiichiro
Published: July 2006

The spectral line profiles of emission lines from hollow cathode lamps and an inductively coupled argon plasma have been measured by using a wavelength-modulation echelle monochromator. The data for the linewidths of Zn, Cd, Fe, Mg and Ca are provided along with a data correction method.
REACTIONS OF α-HETEROATOM-SUBSTITUTED ETHERS AND SULFIDES WITH SILYL ENOL ETHERS. CHEMOSELECTIVITY IN THE CLEAVAGE OF HETEROATOM–CARBON BONDS BY IODOTRIMETHYLSILANE AND TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE
Authors: Hosomi Akira , Sakata Yasuyuki , Sakurai Hideki
Published: July 2006

Reactions of α-heteroatom-substituted ethers and related compounds (R1R2CXY; X, Y = RO, RS and Cl) with silyl enol ethers and ketene silyl acetals took place in the presence of iodotrimethylsilane (Ia) and trimethylsilyl triflate (Ib) as a catalyst and factors influencing the activation of the heteroatom by I were examined.
SYNTHESIS OF Q BASE (QUEUINE)
Authors: Kondo Tadao , Ohgi Tadaaki , Goto Toshio
Published: July 2006

Q base (queuine), 2-amino-5-[(3S,4R,5S)-4,5-dihydroxycyclopent-l-en-3-yl-aminomethyl]pyrrolo[2,3-d]pyrimidin-4(3H)-one, was synthesized via the Schiff base intermediate.
PREPARATION AND STRUCTURE OF Ag(I) COMPLEX WITH CYCLO(l-METHIONYL-l-METHIONYL)
Authors: Kojima Yoshitane , Yamashita Tetsushi , Ishino Yoshio , Hirashima Tsuneaki , Hirotsu Ken
Published: July 2006

The structure of a Ag(I) complex with cyclo(l-methionyl-l-methionyl) was examined by means of 1H NMR spectra and X-ray structure analysis. The spectra suggest that the sulfur atoms of the ligand coordinate to Ag(I) ion. In crystaline state, each Ag atom is coordinated linearly to two sulfur atoms to give a helical polymer along b-axis.
THE CRYSTAL STRUCTURE OF CALCIUM SULFITE TETRAHYDRATE
Authors: Matsuno Takashi , Takayanagi Hiroaki , Furuhata Kimio , Koishi Masumi , Ogura Haruo
Published: July 2006

The crystal structure of calcium sulfite tetrahydrate has been determined by the single-crystal X-ray diffraction method. The crystal of the tetrahydrate is monoclinic with space group C2/c, cell dimensions : a=19.385(11) Å, b=11.192(4) Å, c=11.449(10) Å, β=124.34(4)° and Z=12. The crystal structure has been determined by the symbolic addition method and refined by the full-matrix least-squares method to give the final R value of 0.084 for 1744 non-zero reflections.
REACTIONS OF TROPONE TOSYLHYDRAZONE SODIUM SALT WITH ACETYLENE DERIVATIVES: A NOVEL SYNTHESIS OF 1H-1,2-BENZODIAZEPINE DERIVATIVES
Authors: Saito Katsuhiro
Published: July 2006

The reactions of tropone tosylhydrazone sodium salt (1) with acetylenes (3a–3c) afforded 1H-1,2-benzodiazepines (8a–8c), which are considered to be formed by additions of diazotropylidene (2) with the acetylenes via norcaradiene intermediates (6).
ABSOLUTE CONFIGURATION OF POLYPEPTIDE AND DYE COMPLEXES BY AN APPLICATION OF THE EXCITON CHIRALITY METHOD
Authors: Yamamoto Hiroyuki , Nakazawa Ayako
Published: July 2006

Absolute configurations of the poly(Nε-alkyl-l-lysine) and alkylamino azo dye complexes have been examined by the exciton chirality method. Most complexes showed the S-chirality of the dipole transition moments of dyes. Increased hydrophobic property changed the chirality of dye from common S- to uncommon R-chirality.
DISCRIMINATION OF REDUCTION PROCESSES OF PARTIALLY CUPRIC ION-EXCHANGED Y ZEOLITES BY A TEMPERATURE-PROGRAMMED REDUCTION TECHNIQUE
Authors: Iwamoto Masakazu , Nagano Hiromi , Furukawa Hiroshi , Kagawa Shuichi
Published: July 2006

Four reduction processes of Cu(II) to Cu(O) in Y zeolite framework have been discernible in temperature-programmed reduction experiments with hydrogen. The reduction peaks around 473 and 593 K were proposed to correspond to the reductions of lone Cu(II) ions and Cu2+–O2−–Cu2+ species to Cu(I) ions, respectively. The generated Cu(I) ions were further reduced to Cu(O) atoms around 803 and 1153 K.
STEREOSELECTIVE SYNTHESIS OF l-SUGARS OF BIOLOGICAL IMPORTANCE STARTING FROM 4-O-BENZYL-2,3-O-ISOPROPYLIDENE-l-THREOSE AS A CHIRAL BUILDING BLOCK
Authors: Mukaiyama Teruaki , Yamada Tohru , Suzuki Keisuke
Published: July 2006

Biologically important l-sugars 2-deoxy-l-galactose, 3-amino-2,3-dideoxy-l-xylo-hexose, and l-diginose were successfully synthesized from the homoallyl alcohol, prepared by the stereoselective addition of allylic Sn(IV) reagent to 4-O-benzyl-2,3-O-isopropylidene-l-threose.
ORGANIC CONDUCTORS: ELECTRICAL PROPERTIES OF HMTTeF (HEXAMETHYLENETETRATELLURAFULVALENE) COMPLEXES
Authors: Saito Gunzi , Enoki Toshiaki , Inokuchi Hiroo , Kumagai Hiroaki , Tanaka Jiro
Published: July 2006

Several charge transfer complexes of HMTTeF (hexamethylenetetratellurafulvalene) with TCNQs, p-quinones, and other π-acceptors were prepared and electrical resistivities were measured with compaction samples. Some of them revealed very low resistivities (ρRT<1Ωcm) and low activation energies(εa<0.01eV). Intermolecular interaction through tellurium atoms seems to play an important role in the conduction.
SIMULTANEOUS REMOVAL OF NOx AND SOx FROM FLUE GAS BY USE OF MOLTEN HYDROGENSULFATES AS REACTION MEDIA
Authors: Shikada Tsutomu , Oba Takamasa , Fujimoto Kaoru , Tominaga Hiro-o
Published: July 2006

The simultaneous removal of NOx and SOx by reaction with ammonia from flue gas was found to be attained at temperature ranging from 150 to 200°C in molten salts of hydrogensulfates dissolving V2O5. The addition of transition metal sulfates such as Ti(SO4)2, Zr(SO4)2 or CuSO4 led to a marked increase in the SOx removal.
DOUBLE CYCLOADDITION REACTION OF PYRIDINIUM N-METHYLIDES TO METHYLENECYCLOPROPENES LEADING TO CAGE COMPOUNDS
Authors: Tsuge Otohiko , Kanemasa Shuji , Takenaka Shigeori
Published: July 2006

A new functionalization of pyridine has been demonstrated by the double cycloaddition reactions between pyridinium N-methylides and methylenecyclopropenes with unsaturated substituents at the 4-position forming a new type of cage compounds.
EPOXIDATION OF ALNUS-5-EN-3β-YL ACETATE AND CONVERSION OF DENDROPANOXIDE INTO DATURADIOL
Authors: Tori Motoo , Takai Masaki , Matsumoto Yuzo , Moriyama Yoshihiko , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi
Published: July 2006

Contrary to the reported literature, the main epoxide derived from alnus-5-en-3β-yl acetate (1) was shown to be a β-epoxide. Daturadiol (=olean-12-ene-3β,6β-diol) was prepared from dendropanoxide via 1 and its α-epoxide.
THERMAL ELECTROCYCLIC REACTION OF 4-CARBOMETHOXY-3-[CIS-2-(2,6,6-TRIMETHYL-1-CYCLOHEXENYL) VINYL] CYCLOHEX-2-EN-1-ONE
Authors: Kim Tong Hei , Isoe Sachihiko
Published: July 2006

Thermal cyclization of titled cis-trienone 3 leads to a mixture of tricyclic ketone 4 and an unexpected aromatic ketone 5, the latter being derived by the elimination of methyl group.
ENHANCEMENT OF THE METHANOL FORMATION FROM CO AND H2 OVER SUPPORTED RUTHENIUM CATALYSTS BY H2–H2O TREATMENT
Authors: Kobori Yoshihiro , Yamasaki Hirofumi , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

Supported ruthenium catalysts, which was treated by H2–H2O mixture at elevated temperatures, could produce methanol from CO and H2 with 50% selectivity, and the nature of the active sites for methanol formation on these catalysts was discussed.
ELECTRONIC EFFECTS OF ADDITIVES ON THE SELECTIVITY IN CO/H2 REACTION OVER NICKEL CATALYSTS
Authors: Okamoto Yasuaki , Matsunaga Etsuo , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

It was found with CO/H2 reaction over unsupported Ni catalysts that the C2+/CH4 selectivity decreased in the order; Ni-boride > Raney-Ni > Decomposed-Ni ∼ Ni-phosphide. This suggests that both the activity and selectivity increase as the electron density on Ni metal increases. The H/C atomic ratio of the surface carbon species deposited during the reaction was also dependent on the catalyst.
DIELECTRIC ABSORPTION IN POLYCRYSTALLINE IRON(II) PHOSPHATE. A POSSIBLE MODEL OF ELECTRON HOPPING BETWEEN TWO SITES IN THE CRYSTAL LATTICE
Authors: Aihara Ariyuki , Kitajima Ryoichi , Ota Takeshi
Published: July 2006

A remarkable dielectric absorption has been observed in the polycrystalline sample of iron(II) phosphate at room temperature with the maximum of absorption at about 20 Hz. Electron hopping between two sites in the crystal, i.e., between Fe2+ and Fe3+ ions, is suggested as a possible mechanism of this dielectric absorption.
REVERSIBILITY IN THE HOMOLYTIC AROMATIC SUBSTITUTION WITH SILYL AND GERMYL RADICALS
Authors: Sakurai Hideki , Kira Mitsuo , Sugiyama Hisashi
Published: July 2006

The 3,6-bis(trimethylsilyl)cyclohexadienyl radical (1), generated from the corresponding cyclohexadiene, gave the expected p-bis(trimethylsilyl) benzene (4) at 0°C. At 130°C, however, the reaction afforded trimethylsilylbenzene, 4, and m-bis(trimethylsilyl)benzene in 62, 17, and 5% yield, respectively. The suggested elimination of the trimethylsilyl radical from the cyclohexadienyl radical is demonstrated by ESR.
SWEET TASTING PSEUDO-SUGARS
Authors: Suami Tetsuo , Ogawa Seiichiro , Toyokuni Tatsushi
Published: July 2006

Pseudo-Dl-glucose and pseudo-Dl-galactose, in which the ring-oxygens of pyranoid sugars have been replaced by a methylene group, are equally sweet as their respective true sugars. It has thus been demonstrated that the displacement of the ring-oxygen in a pyranoid sugar by the methylene group affords no prejudicial effect on the sweetness.
KETOEMBLIDE AND SARCOPHYTOLIDE, TWO NEW CEMBRANOLIDES WITH ε-LACTONE FUNCTION FROM THE SOFT CORAL SARCOPHYTA ELEGANS
Authors: Uchio Yasuto , Nitta Masayoshi , Nakayama Mitsuru , Iwagawa Tetsuo , Hase Tsunao
Published: July 2006

Two new cembranolides, ketoemblide and sarcophytolide, with ε-lactone function have been isolated from the soft coral Sarcophyta elegans. The structures were elucidated on the basis of chemical correlation with emblide and spectral data.
THE CHARGE-TRANSFER TRANSITION FOR THE SYMMETRY-FORBIDDEN CHARGE-TRANSFER INTERACTION IN THE CS SYSTEM. 9,10-DIHYDRO-9,10-ETHANO-[1,4]-BIS(DICYANOMETHYLENE)ANTHRACENES
Authors: Yamamura Kimiaki , Nakasuji Kazuhiro , Yamochi Hideki , Murata Ichiro , Inagaki Satoshi
Published: July 2006

Some 9,10-dihydro-9,10-ethano-[1,4]-bis(dicyanomethylene)anthracene derivatives have been synthesized. The substituent effects on the charge-transfer band shifts of these compounds strongly supported our previously proposed argument for the charge-transfer transition for the symmetry-forbidden charge-transfer interaction.
DIANIONS OF β-HYDROXY SULFONES: NEW AND GENERAL APPROACH TO SELECTIVE SYNTHESIS OF 2(5H)-FURANONES
Authors: Tanaka Kazuhiko , Ootake Kazuhiko , Imai Keisuke , Tanaka Nobuo , Kaji Aritsune
Published: July 2006

Dianions derived from β-hydroxy sulfones are highly reactive toward a variety of electrophiles including alkyl halides, carbonyl compounds, and sodium iodoacetate. A convenient synthetic method for 4-alkyl- and 5-alkyl-2(5H)-furanones has been developed by using these dianions. A new synthetic approach to trans-3,4-bis(3-hydroxybenzyl)dihydro-2(3H)-furanone, the first lignan found in humans, via a facile reduction of 2(5H)-furanone with Mg-methanol is also decribed.
RATE FOR PHOTODIMERIZATION OF ETHYL CINNAMATE IN DILUTE SOLUTION
Authors: Shindo Yoichi , Horie Kazuyuki , Mita Itaru
Published: July 2006

Kinetic parameters for photodimerization of ethyl cinnamate were determined in dilute ethanol solution (3∼5×10−5M) where the spontaneous deactivations of excited states proceed much faster than their bimolecular reactions. The quantum yield of cyclodimer formation from excited singlet state, ΦDM′/[C]0 ≅ τMκDM, and that from excited triplet state, ΦISCφDT′/[C]0 ≅ ΦISCτTκDT, are 15 M−1 and 13 M−1, respectively, in ethanol at 30 °C.
PHOTOCHEMISTRY OF 10-ALKYL-10-CARBOMETHOXY-β-IONONE UNDER BASIC CONDITIONS
Authors: Kim Tong Hei , Hayase Yoshio , Isoe Sachihiko
Published: July 2006

Irradiation of 10-alkyl-10-carbomethoxy-β-ionones 1a, b under basic conditions gave 2-oxatricyclo[4,4,0,01.5]-decane derivatives 5a, b; the mechanism involves initial cis–trans isomerization of the C7–C8 double bonds followed by [2+4] cycloaddition reaction and double bonds isomerization.
BIS(DIISOBUTYLALUMINUM) 1,2-ETHANEDITHIOLATE: A REAGENT IN THE CONVERSION OF OXYACETALS TO THIOACETALS
Authors: Satoh TsuyoShi , Uwaya Satoru , Yamakawa Koji
Published: July 2006

Bis(diisobutylaluminum) 1,2-ethanedithiolate (9) made from diisobutylaluminum hydride and ethanedithiol in benzene is useful to convert oxyacetals into thioacetals, however not effective to ketones.
ON THE REACTION OF PRIMARY ALIPHATIC AMINES WITH 1,2-NAPHTHOQUINONE-4-SULFONIC ACID
Authors: Hartke Klaus , Lohmann Ulrike
Published: July 2006

Primary amines react with 1,2-naphthoquinone-4-sulfonic acid to form violet dyes in a complex redox reaction. Their general structure 6 has been established by an independent synthesis.
CYCLOADDITION REACTION OF IMIDAZO[1,2-c]THIAIVZOLE TO ACETYLENIC DIPOLAROPHILES AND NOVEL CONVERSION OF CYCLOADDUCTS INTO 4,9c-DIAZAPENTALENO[1,6a,6 : ab]NAPHTHALENES
Authors: Tsuge Otohiko , Kanemasa Shuji , Hamamoto Takayoshi
Published: July 2006

A nitrogen-bridged tetravalent sulfur compound, 1,3,6-triphenylimidazo[1,2-c]thiaIVzole, reacts with several acetylenic dipolarophiles giving excellent yields of regio- and periselective [3+2] cycloadducts to the azomethine ylide 1,3-dipole of the thiaIVzole. These cycloadducts undergo, in the presence of triethylamine, a rare desulfurization and a subsequent 10π cyclization yielding the derivatives of a new heterocyclic system, 4,9c-diazapentaleno[1,6a,6 :ab]naphthalene.
UTILIZATION OF METHYLTHIOMETHYL p-TOLYL SULFONE IN ORGANIC SYNTHESIS
Authors: Ogura Katsuyuki , Yahata Nobuhiro , Hashizume Kimitoshi , Tsuyama Koichi , Takahashi Kazumasa , Iida Hirotada
Published: July 2006

Methylthiomethyl p-tolyl sulfone was found to be one of the useful reagents for preparation of various organic compounds such as S-methyl α-ketocarbothioates, carboxylic esters, five- and six-membered cycloalkanones, and α-methoxy-α-arylacetic esters.
STEREOSELECTIVE RATE ENHANCEMENT OF MICELLE-CATALYZED HYDROLYSIS OF o-NITROPHENYL-β-d-GLUCOPYRANOSIDE
Authors: Kodaka Masato
Published: July 2006

The rate of hydrolysis of o-nitrophenyl-β-d-glucopyranoside was largely enhanced in the presence of cationic micelle and phenylboronic acid under alkaline conditions, while that of o-nitrophenyl-β-d-galactopyranoside was much less enhanced.
ENZYMIC SYNTHESIS AND CHARACTERIZATION OF SOME NOVEL INDAZOLE NUCLEOTIDES
Authors: Tono-Oka Shuichi , Sekikawa Isao , Azuma Ichiro
Published: July 2006

NADase-catalysed enzymic reaction was successfully applied to the synthesis of some novel β-indazole dinucleotides. Their structures were determined on the basis of UV- and 1H-NMR spectral data. Chemical properties thereof are also described.
9-DIMETHYLAMINO-9,10-DIHYDRO-9,10-ETHENOANTHRACENE N-OXIDE: AN EXAMPLE WHICH SHOWS SLOW INTERNAL ROTATION ABOUT A Nsp3–Csp3 BOND
Authors: Kakizaki Fumihiko , Nakamura Nobuo , Oki Michinori
Published: July 2006

9-Dimethylamino-9,10-dihydro-9,10-ethenoanthracene was prepared by reductive dechlorination of its tetrachloro derivative and was oxidized to produce the title compound. The compound crystallized as an ap conformer. On dissolution, it isomerized to its ±sc conformer with a rate constant 2.52×10−5 s−1 at 30 °C until the equilibrium (±sc/ap=0.16) was reached. The following activation parameters were obtained: ΔH≠ 23.1±4.4 kcal mol−1, ΔS≠ −3.9±14.1 e. u.
SYNTHESES OF AM-TOXIN I ANALOGS CONTAINING A LOWER OR HIGHER HOMOLOG OF l-2-AMINO-5-(p-METHOXYPHENYL)PENTANOIC ACID
Authors: Mihara Hisakazu , Aoyagi Haruhiko , Kato Tetsuo , Ueno Tamio , Izumiya Nobuo
Published: July 2006

Two analogs of AM-toxin I (cyclic tetradepsipeptide), [l-2-amino-4-(p-methoxyphenyl)butanoic acid3]-AM-toxin I and [l-2-amino-6-(p-methoxyphenyl)hexanoic acid3]-AM-toxin I, were synthesized by the conventional method of peptide synthesis. Their weak necrotic activities on apple leaf indicated high importance of the side-chain length of l-2-amino-5-(p-methoxyphenyl)pentanoic acid residue at position 3 in AM-toxin I.
MANGANESE DIOXIDE AS SPECIFIC REDOX CATALYST IN THE PHOTOSENSITIZED OXYGEN GENERATION FROM WATER
Authors: Okuno Yohmei , Yonemitsu Osamu , Chiba Yukihiro
Published: July 2006

Catalytic formation of oxygen from water was observed in the photosensitized reaction by trisbipyridineruthenium(II) using manganese dioxide as a redox catalyst and pentaammine chlorocobalt(III) as an electron acceptor in acidic solution. The β- and “activated” materials are found to be the most efficient and specific redox catalysts, and a 230% of O2 yield based on MnO2 is obtained.
NOVEL 1,2- AND 1,3-DOUBLE CHIRAL RECOGNITIONS. OPTICAL RESOLUTION OF α- AND β-HALOACETYLENIC ALCOHOLS BY COMPLEXATION WITH BRUCINE
Authors: Toda Fumio , Tanaka Koichi , Mori Koji
Published: July 2006

Optical resolution of α- (2,3) and β-haloacetylenic alcohols (13,14) which have two chiral carbons at the 1,2- and 1,3-positions, respectively, was performed efficiently by complexation with brucine. By the same method, α,β-dichloroacetylenic alcohols (8,9) which have three chiral carbons at the 1,2,3-positions were also resolved.
PHOTO-EXCITED REACTIVITY OF FLAVIN STUDIED BY CIDNP TECHNIQUE
Authors: Maruyama Kazuhiro , Otsuki Tetsuo
Published: July 2006

The photo-excited flavin was found to undergo the electron-transfer reaction with a variety of electron donors. The relative importance of the different spin states of flavin concerned is governed by the nature and the concentration of electron donors.
STEREOSPECIFIC REVERSIBLE CYCLOADDITION REACTIONS OF A BIPERIFUNCTIONAL COMPOUND, 1,3,6-TRIPHENYLIMIDAZO[1,2-c]THIAIVZOLE
Authors: Tsuge Otohiko , Kanemasa Shuji , Hamamoto Takayoshi
Published: July 2006

A nitrogen-bridged tetravalent sulfur compound, 1,3,6-triphenylimidazo[1,2-c]thiaIVzole, undergoes highly stereospecific cycloaddition reactions to some acyclic olefinic dipolarophiles giving the [3+2] cycloadducts to the thiocarbonyl ylide of the imidazothiaIVzole in good yields. The formation of the [3+2] cycloadducts is explained to have arisen from the reversible cycloaddition reactions in a concerted manner.
N,N′-BIS(ARYLTHIO)BENZAMIDINYL RADICALS. A NEW CLASS OF PERSISTENT NITROGEN-CENTERED FREE RADICALS
Authors: Miura Yozo , Kunishi Teruo , Kinoshita Masayoshi
Published: July 2006

N,N′-Bis(arylthio)benzamidinyl radicals were generated and studied by ESR spectroscopy. They were extremely persistent in solution, even in the presence of oxygen.
THE 14N, 35Cl, AND 81Br NMR SPECTRA OF SUBSTITUTED PYRIDINIUM CHLORIDES, PERCHLORATES, AND BROMIDES IN AQUEOUS SOLUTION. AN EVIDENCE TO CONTACT ION PAIR FORMATION
Authors: Ogino Jun-ichi , Suezawa Hiroko , Hirota Minoru
Published: July 2006

14N, 35Cl, and 81Br NMR line widths of several chlorides, bromides and perchlorates of 4-substituted pyridinium and related heteroaromatic cations were measured at various concentrations in aqueous solutions. The results were interpreted by assuming the contact ion pair formation, since the calibrated line widths w of halogen nuclei in anions were linearly dependent on the line widths of 14N in respective cations.
REGIOSELECTIVE OXIDATION OF ZIRCONIUM-DIENE AND ALLYLIC ZIRCONIUM COMPLEXES LEADING TO ALLYLIC ALCOHOLS
Authors: Yasuda Hajime , Nagasuna Kinya , Asami Keiichi , Nakamura Akira
Published: July 2006

Oxidation of zirconium-isoprene or α-myrcene complex with aq. H2O2 gave 2-methyl-3-buten-2-ol or linalool, respectively, in good yield. A series of allylic zirconium complexes afforded allylic alcohols, and oxazirconacyclic complexes gave diols by oxidation with H2O2, t-BuOOH, MCPBA or oxygen. Iodination of these complexes was also examined.
CIRCULARLY POLARIZED FLUORESCENCE SPECTRA OF CHOLESTERIC LIQUID CRYSTALS CONTAINING AROMATIC CHROMOPHORES
Authors: Sisido Masahiko , Takeuchi Kazuhiko , Imanishi Yukio
Published: July 2006

Ci rcularly polarized fluorescence (CPF) spectra of guest aromatic molecules embedded in host cholesteric liquid crystals were measured. Such chromophores as tetracene and pyrene showed frequently oscillating CPF spectra which were interpreted in terms of the alternative direction of the fluorescence polarization of vibronic transitions.
A STEREOCONTROLLED SYNTHESIS OF 2-METHYL-2-ALKENENITRILES FROM C-METHYL-C,N-BIS(TRIMETHYLSILYL)KETENIMINE AND ALDEHYDES
Authors: Okada Hisashi , Matsuda Isamu , Izumi Yusuke
Published: July 2006

A stereocontrolled synthesis of 2-methyl-2-alkenenitriles is achieved via the diastereoselective aldol type reaction of C-methyl-C,N-bis(trimethylsilyl)ketenimine with aldehydes in the presence of a mixture of TiCl4 and Ti(O-iPr)4.
ALKALINE FLUORIDE-m-CHLOROPEROXYBENZOIC ACID SYSTEMS AS MODULATED OXIDATION REAGENTS: EPOXIDATION OF α,β-UNSATURATED ACETALS
Authors: Camps Francisco , Coll José , Messeguer Angel , Pujol Ferran
Published: July 2006

High yields (80–96%) of epoxides of α,β-unsaturated acetals can be obtained by the use of suitable KF:NaF:m-CPBA mixtures as modulated oxidation reagents.
SYNTHESIS OF BICYCLO[4.3.1]DEC-2-EN-7-ONE VIA INTRAMOLECULAR [2+2] PHOTOCYCLOADDITION
Authors: Seto Hideharu , Hirokawa Shinya , Fujimoto Yasuo , Tatsuno Takashi
Published: July 2006

An efficient five step synthesis of bicyclo[4.3.1]dec-2-en-7-one by intramolecular [2+2] photocycloaddition of 1-acetoxy-2-(pent-4-enoyl) cyclopentene and subsequent transformation sequence of the resulting cyclobutane derivative is described.
TRANSANNULAR CYCLIZATION OF DICTYODIAL ON SILICA GEL
Authors: Ishitsuka Midori , Kusumi Takenori , Kakisawa Hiroshi
Published: July 2006

Transannular cyclization of dictyodial (1) , catalyzed with silica gel, produces an oxetane (4) besides sanadaol (2) and isosanadaol (5).
ISOLATION AND STRUCTURE OF GYMNOPRENOL-D, A HOMOLOGOUS SERIES OF FULLY HYDRATED POLYISOPRENEPOLYOL FROM GYMNOPILUS SPECTABILIS
Authors: Nozoe Shigeo , Koike Yutaka , Ito Noriie , Kusano Genjiro
Published: July 2006

Gymnoprenol-D, a homologous series of fully hydrated polyisoprenepolyol having a glycerol terminus has been isolated from an hallucinogenic mushroom, Gymnopilus spectabilis along with an analogous compound with one double bond. The structure of these polyols was determined by a combination of chemical degradation and spectroscopic analyses.
STEREOCHEMICAL CHARACTERIZATION OF HYDRATED AND DEHYDRATED CRYSTALS OF N-ACETYLNEURAMINIC ACID AS REVEALED BY THE IR,CD, AND 13C CROSS POLARIZATION-MAGIC ANGLE SPINNING NMR SPECTROSCOPY
Authors: Ogura Haruo , Furuhata Kimio , Saitô Hazime , Izumi Giichi , Itoh Masayoshi , Shitori Yoshiyasu
Published: July 2006

Fine needle (dehydrated) and prism (hydrated) crystals were obtained by changing condition of recrystallization of N-acetylneuraminic acid. The anomeric configuration of both was confirmed as the β-form. We found that local conformation of N-acetyl and glycerol moieties of the fine needles is significantly altered as compared with that of the prisms.
OBTENTION D’UN α-AMINO ALDEHYDE OPTIQUEMENT ACTIP EN SERIE β-LACTAME
Authors: Labia Roger , Morin Christophe
Published: July 2006

Oxidation of a suitable protected L-aspartic acid derived azetidinone gives rise to a chiral β-lactam carboxaldehyde without significant racemization.
REACTIONS OF A STABLE THIOBENZALDEHYDE WITH ORGANOMETALLICS
Authors: Okazaki Renji , Fukuda Nobuo , Oyama Hiroyuki , Inamoto Naoki
Published: July 2006

Reactions of 2,4,6-tri-t-butylthiobenzaldehyde with Grignard and organolithium reagents gave products via the anion radical of the thioaldehyde. The first example of dimerization of thioketyl radicals was also presented.