bluuebunny/crossref_metadata_2025 huggingface dataset:
PALLADIUM CATALYZED REACTION OF ALKYL 5-BROMO-2-FUROATE WITH ALLYLIC ALCOHOLS: A CONVENIENT SYNTHESIS OF 2-(3′-OXOALKYL)FURANS
Authors: Tamaru Yoshinao , Yamada Yoshimi , Yoshida Zen-ichi
Published: July 2006

Alkyl 5-bromo-2-furoate reacts with allylic alcohols in the presence of 1 mol% of palladium acetate to give 1-(5′-alkoxycarbonyl-2′-furyl)-3-oxoalkanes (3) selectively, together with small amounts of 1- (5′-alkoxycarbonyl-2′-furyl)-2-oxoalkanes (4). The reaction (regio-selectivity and reactivity) largely depends on the structure of allylic alcohols.
SUBSTITUENT EFFECTS ON THE RATIO OF [2,3]-SIGMATROPIC REARRANGEMENT vs syn-ELIMINATION OF ALLYLIC ARYL SULFOXIDES
Authors: Isobe Minoru , Iio Hideo , Kitamura Masato , Goto Toshio
Published: July 2006

Substituent effects on the ratio of [2,3]-sigmatropic rearrangement vs syn-elimination of allylic aryl sulfoxides were studied to reveal that an electron-donating substituent of the aryl group was efficient for the rearrangement in view of suppression of the elimination, a potentially significant side reaction. Electron-donating substituent on the vinyl group, however, seemed to have the reverse effect.
ISOASATONE A AND ISOASATONE B, TWO NOVEL NEOLIGNANS, FROM HETEROTROPA TAKAOI M.
Authors: Terada Yukimasa , Yamamura Shosuke
Published: July 2006

Two new neolignans, isoasatone A (3) and isoasatone B (4) have been isolated from the plant Heterotropa takaoi M., and their structures also been elucidated by comparing their spectral data with those of asatone (1).
MICELLAR CATALYSIS OF CN−-ASSISTED ISOALLOXAZINE(FLAVIN ANALOGUE) OXIDATION OF ALDEHYDES TO CARBOXYLIC ACIDS
Authors: Shinkai Seiji , Ide Toyoko , Manabe Osamu
Published: July 2006

Facile isoalloxazine oxidation of aldehydes to carboxylic acids was achieved in the presence of a cationic micelle and CN− ion. The formation of a carbanion intermediate was proposed on the basis of the kinetic examinations. The role of the cationic micelle and CN− ion was discussed.
THIONE S-IMIDE. REACTION WITH CARBON–CARBON DOUBLE BOND
Authors: Saito Takao , Motoki Shinichi
Published: July 2006

9-Fluorenethione S-p-toluenesulfonimide (I) reacted with 1,3-dienes on C=S bond of the imide to afford (2+4) cycloadducts, while with vinyl ethers the imide underwent a (3+2) type cycloaddition reaction to give isothiazolidines.
SYNTHESIS OF NUCLEOSIDES FROM 1-HYDROXYSUGARS USING 2-CHLOROBENZOXAZOLIUM SALT
Authors: Mukaiyama Teruaki , Shoda Shin-ichiro , Nakatsuka Takashi , Narasaka Koichi
Published: July 2006

A novel method for the preparation of trans nucleosides was developed by the use of 2-chloro-3-ethylbenzoxazolium tetrafluoroborate as a condensing reagent. Several trans nucleosides were prepared from 1-hydroxysugars and heterocycles in good yields under mild conditions.
AN ELECTRON SPIN RESONANCE STUDY OF NORBORN-5-EN-2-YL AND RELATED RADICALS
Authors: Sugiyama Yoshio , Kawamura Takashi , Yonezawa Teijiro
Published: July 2006

The homoallylic rearrangement of the norborn-5-en-2-yl radical to the 3-nortricyclyl radical is observed by esr. An analysis of esr spectra of norborn-5-en-2-yl, benzonorbornen-2-yl, and naphthonorbornen-2-yl radicals suggests that the homoconjugation involved in these radicals is not large.
DIELS-ALDER REACTIONS OF TRIMETHYLSILOXY-SUBSTITUTED BUTADIENES WITH DIMETHYL ACETYLENEDICARBOXYLATE
Authors: Yamamoto Keiji , Suzuki Shigeaki , Tsuji Jiro
Published: July 2006

A variety of trimethylsiloxy-substituted butadienes, including novel 1-methoxy-1,3-bis(trimethylsiloxy)butadiene, react in a Diels–Alder process with dimethyl acetylenedicarboxylate. The adducts were converted, via elimination or oxidative aromatization, into four corresponding dimethyl hydroxy-substituted phthalates in good to moderate yields.
CATALYTIC ACTIVITY OF THE LIQUID Na–Pb ALLOY SYSTEM
Authors: Honda Kazuaki , Takahashi Katsumi , Saito Yasuo , Ogino Yoshisada
Published: July 2006

The liquid Na–Pb alloy system has been found to catalyze the dehydrogenation of several alkylbenzenes, i.e. ethylbenzene, cumene, and p-cymene. It has also been found that the alloy catalyzes the dehydrogenation of tetralin. In every reactions, the selectivity has been found to be satisfactorily high.
NMR STUDY ON THE PROTONATION OF IMIDAZOLE RING OF N-ACETYL-l-HISTIDINE METHYLAMIDE, A MODEL FOR HISTIDINE RESIDUES EXPOSED TO AQUEOUS SOLVENT
Authors: Tanokura Masaru , Tasumi Mitsuo , Miyazawa Tatsuo
Published: July 2006

The pH titration curves of proton NMR chemical shifts were observed for N-acetyl-l-histidine methylamide and l-histidine in H2O and D2O. Macroscopic pKa and intrinsic chemical shifts for each ionic species were obtained. The enthalpy and entropy changes on protonation of the imidazole ring were determined. These data are useful for the discussions of microenvironments of histidine residues in proteins.
CRYSTALLINE-STATE RACEMIZATION BY X-RAY EXPOSURE IN COBALOXIME COMPLEXES
Authors: Ohashi Yuji , Sasada Yoshio , Ohgo Yoshiaki
Published: July 2006

A new example of the direct observation on the racemization of the α-cyanoethyl group by X-ray exposure is obtained with the crystal of S-α-cyanoethyl(S-α-methylbenzylamine)cobaloxime, the diastereoisomer of the previously reported compound [Ohashi and Sasada, Nature, 267, 142 (1977)]. The structure and the thermal behavior of the present crystal are similar to those of the crystal of its diastereoisomer. This fact confirms the previous proposal on the mechanism of the racemization.
A DIRECT METHOD FOR α-METHYLENEBUTYROLACTONE SYNTHESIS USING HOMOALLYL ALCOHOLS
Authors: Matsuda Isamu
Published: July 2006

3-Trimethylsily-3-buten-1-ols (1) are prepared by a ring opening of epoxides with α-trimethylsilvinylmagnesium bromide in the presence of catalytic amounts of CuI. 3-Bromo-3-buten-1-ols (2) derived from (1) react with Ni(CO)4 to give directly α-methylenebutyrolactones (4) with the assistance of potassium acetate in good yields except the case of a cyclopentanol derivative (2e).
[3.3]- AND [4.4]-TROPYRIOPARACYCLOPHANE TETRAFLUOROBORATES—INTRAMOLECULAR CHARGE–TRANSFER INTERACTION—
Authors: Horita Hisanori , Otsubo Tetsuo , Misumi Soichi
Published: July 2006

The title compounds were synthesized and their structures were confirmed by NMR spectra. The [3.3]cyclophane 2 shows significant charge-transfer bands in its electronic spectrum. The intramolecular CT interaction in three [n.n]tropylioparacyclophane homologues is compared.
ENHANCED REACTIVITIES OF “NAKED” METAL ION AND WATER AFFORDED IN REVERSED MICELLES
Authors: Sunamoto Junzo , Kondo Hiroki , Akimaru Kenji
Published: July 2006

Through the kinetic studies on the hydrolysis of norleucine p-nitrophenyl ester in the AOT/CCl4 reversed micelles cosolubilizing aqueous cupric nitrate, we observed evidence of the “naked” copper(II) ion which easily forms a complex with the substrate ester (log kf=8∼9) and “free” water molecule acting as an effective nucleophile on the labile complex (kH2O=0.2∼0.8 M−1 s−1).
HEATS OF SOLUTION OF CRYSTALLINE OPTICALLY ACTIVE AND RACEMIC AMINOACIDS IN WATER
Authors: Matsumoto Masayuki , Amaya Kazuo
Published: July 2006

The heats of solution of aminoacids crystals at 298.15 K have been measured. The difference between the heat of solution of optically active compounds and that of corresponding racemic compounds was appreciably large compared with the heat of mixing of concentrated aqueous solutions of d- and l-optical isomers, and the values were several kJ/mol at most.
CHEMISTRY OF ORGANOSILICON COMPOUNDS CXVI. FLUORIDE ION-PROMOTED ISOMERIZATION OF METHYL-SUBSTITUTED ALLYLSILANES. REGIOSELECTIVE SYNTHESES OF ALLYLSILANES
Authors: Hosomi Akira , Shirahata Akihiko , Sakurai Hideki
Published: July 2006

Fluoride ion-catalyzed isomerization of methyl-substituted allylsilanes is reported. In the reaction, a regioisomer of allylsilanes, in which the silicon atom binds to the less substituted carbon atom of the allylic group, is obtained. Accordingly, the reaction is useful as a new route to regioselective synthesis of allylsilanes.
NOVEL CYCLODIMERIZATION AND CYCLOTRIMERIZATION OF 3-HEXYNE BY CATIONIC NICKEL HYDRIDE COMPLEX
Authors: Inoue Yoshio , Itoh Yoshio , Hashimoto Harukichi
Published: July 2006

Cationic nickel hydride complex, [HNi(dpe)2]OCOCF3 (dpe=Ph2PCH2CH2PPh2, catalyzed the novel cyclodimerization and cyclotrimerization of 3-hexyne to afford 1,2,4-triethyl-3-ethylidenecyclobutene 1, pentaethyl-5-propenylcyclopentadiene 2, and pentaethyl-5-allylcyclopentadiene 3.
PHOTOCYCLIZATION IN 3-[ω-(ANILINO) ALKOXY] NITROBENZENES
Authors: Mutai Kiyoshi , Kanno Sei-ichiro , Kobayashi Keiji
Published: July 2006

Irradiation of solutions of 3-[ω-(anilino) alkoxy]nitrobenzenes, 3 (n=2 and 3), with 313 nm light gave cyclized products, 5, and 6. No intramolecular substitution at the meta C–O bond was observed. The methylamino analogs, 4, showed only degradation under the same conditions.
SPECIFIC SELECTIVITY OF A PARTLY REDUCED MoO3/β-TiO2 FOR HYDROGENATION OF n-BUTENE AND BUTADIENE
Authors: Tanaka Katsumi , Tanaka Ken-ichi , Miyahara Koshiro
Published: July 2006

The cis–trans isomerization reaction of but-2-ene was markedly enhanced by addition of hydrogen over a partly reduced MoO3/β-TiO2 catalyst, but the double bond migration reaction of but-1-ene to but-2-ene was not accelerated by hydrogen. As a result, the deuteration of butadiene on this catalyst yielded 3,4-d2-but-1-ene and 1,4-d2-but-2-ene in a ratio of 7 to 3 with little isomerization. Hydrogenation of a mixture of but-1-ene and but-2-ene brought about the selective hydrogenation of but-1-ene, while the intermediate for the hydrogenation of but-1-ene was deduced to be sec-butyl being common to but-2-ene.
PALLADIUM CATALYZED REACTION OF 4-BROMO-2,6-LUTIDINE WITH ALLYLIC ALCOHOLS
Authors: Tamaru Yoshinao , Yamada Yoshimi , Arimoto Tomoaki , Yoshida Zen-ichi
Published: July 2006

Palladium acetate catalyzed the reaction of 4-bromo-2,6-lutidine with allylic alcohols to give 4-(3′ -oxo-alkyl)-2,6-lutidines selectively together with small amounts of 4-(2′ -oxo-alkyl)-2,6-lutidines. Under the same conditions, 4-chloro- and 2-bromopyridines react to give 4,4′- and 2,2′-bipyridyls, respectively.
SYNTHESIS OF ORGANOBORANES VIA ORGANOALUMINUMS. A CONVENIENT ROUTE TO TRIALKENYLBORANES FROM NONCONJUGATED DIOLEFINS
Authors: Sato Fumie , Haga Shinobu , Sato Masao
Published: July 2006

Hydroalumiination of olefins followed by treatment with boron trifluoride etherate provides a convenient and selective method for the preparation of organoboranes.

Trialkenylboranes are obtained in excellent yields from nonconjugated diolefins.
TOTAL SYNTHESIS OF METHYNOLIDE
Authors: Inanaga Junji , Katsuki Tsutomu , Takimoto Seiji , Ouchida Shuichi , Inoue Kazutaka , Nakano Akio , Okukado Nobuhisa , Yamaguchi Masaru
Published: July 2006

(+)-Methynolide, the aglycon of a macrolide antibiotic, methymycin, was synthesized via its acetylenic analogue, 8,9-didehydromethynolide. The lactonization of the seco-acids was carried out by the newly developed mixed anhydride method using 2,4,6-trichlorobenzoyl chloride.
LOW-SPIN FIVE-COORDINATE Co(II) COMPLEXES OF A 14-MEMBERED MACROCYCLIC TETRAAMINE CONTAINING TWO DEPROTONATED AMIDES—A NEW REVERSIBLE OXYGEN CARRIER
Authors: Ishizu Kazuhiko , Hirai Junko , Kodama Mutsuo , Kimura Eiichi
Published: July 2006

A new 1:1 complex formed between Co(II) and doubly deprotonated 1,4,8,11-tetraazacyclotetradecane-5,7-dione exhibits an ESR spectrum typical of a low-spin square-planar Co(II) complex with the unpaired electron occupying dz2 orbital. Addition of excess imidazole or pyridine yields five-coordinate square-pyramid complexes, which reversibly bind to O2 at −70°C. The rigid planarity of the tetraamine macrocycle is compared with porphyrin chelates using ESR parameters.
INTRAMOLECULAR ACYLATION OF α-SULFONYLCARBANIONS: A NOVEL SYNTHESIS OF γ-BUTYROLACTONES
Authors: Reutrakul Vichai , Tuchinda Patoomratana , Kusamran Kosan
Published: July 2006

A novel synthesis of α-phenylsulfonyl-γ-butyrolactones is described.
STUDIES OF ELECTRODE SURFACE CHANGES IN SITU BY PHOTOACOUSTIC SPECTROSCOPY
Authors: Fujishima Akira , Masuda Hideki , Honda Kenichi
Published: July 2006

Photoacoustic spectroscopy (PAS) was used for the study of electrode-electrolyte interfaces in situ. The design of the PAS cell and the experimental procedure are given. The change in absorption at the interface during electrochemical reaction at Au electrodes, as measured by PAS technique, is described.
ACYLATION OF EPOXIDES BY THE USE OF ACYLTETRACARBONYLFERRATES: SYNTHESIS OF α,β-UNSATURATED KETONES
Authors: Yamashita Masakazu , Yamamura Shuichi , Kurimoto Masatada , Suemitsu Rikisaku
Published: July 2006

α,β-Unsaturated ketones were synthesized in high yields by the reaction of epoxides with acyltetracarbonylferrates.
IRON OXIDE AS AN EFFECTIVE CATALYST FOR THE POLYCONDENSATION OF BENZYL CHLORIDE, THE FORMATION OF PARA-SUBSTITUTED POLYBENZYL
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

Iron oxides prepared by calcining iron hydroxides which were precipitated by hydrolyzing FeCl3 and Fe(NO3)3 with ammonia and iron nitrate at 300–500°C were highly effective for the title reaction at room temperature. The product was stable up to 400°C and predominantly para-substituted polybenzyl with 8175 of molecular weight.
RADICAL POLYMERIZATION OF METHYL METHACRYLATE INITIATED WITH POTASSIUM PERSULFATE IN THE PRESENCE OF NUCLEIC ACID BASE OR BENZO[a]PYRENE
Authors: Imoto Minoru , Kuriyama Akira , Ouchi Tatsuro
Published: July 2006

It was found that nucleic acid bases and nucleosides could retard the radical polymerization of methyl methacrylate(MMA) initiated with K2S2O8 in water. This chain transfer reaction may be the hydrogen abstraction from NH group or the addition of propagating chain radical onto C=C double bond. Also 5-fluorouracil, an antitumor drug, reacted effectively with propagating radicals to retard the polymerization. On the contrary, benzo[a]pyrene, which is known as a carcinogen, was found to promote strongly the radical polymerization of MMA in water.
ANODIC CYCLIZATION OF DI-2-NAPHTHYLAMINE
Authors: Yasukouchi Kazuo , Taniguchi Isao , Yamaguchi Hiroko , Yokoyama Masayuki , Murasaki Masahide
Published: July 2006

A new compound, 5,12-di-2-naphthyldibenzo[c,j]phenazine, was found to be produced in about 30% yield by anodic oxidation of di-2-naphthylamine in acetonitrile at 0.7 V (vs. Ag/Ag+) with a platinum electrode.
NEW SYNTHESIS OF KARAHANA ETHER
Authors: Mukaiyama Teruaki , Iwasawa Nobuharu , Tsuji Takashi , Narasaka Koichi
Published: July 2006

A new synthesis of karahana ether by employing the intramolecular Diels–Alder adduct of furan and β,β-dimethylacrylamide components is described. The facile oxidation of the adduct to N-nitrosoamide is the most significant step of the present synthetic scheme.
REDOX REACTION DRIVEN BY DIFFUSION OF IONS THROUGH AN ARTIFICIAL LIQUID MEMBRANE
Authors: Shinbo Toshio , Sugiura Masaaki , Kamo Naoki , Kobatake Yonosuke
Published: July 2006

A trans-membrane redox reaction against its redox potential was induced with coupling to diffusion of an anion, when a gradient of anion concentration was imposed across an organic liquid membrane containing dibutyl-ferrocene which separated two solutions of equal redox potential.
NEW FARNESYLACETONE DERIVATIVES FROM SARGASSUM MICRACANTHUM
Authors: Kusumi Takenori , Ishitsuka Midori , Nomura Yukihiro , Konno Toshinori , Kakisawa Hiroshi
Published: July 2006

From the brown alga, Sargassum micracanthum, eight new farnesylacetone derivatives were isolated and their structures were elucidated from spectral and chemical properties.
PHOTOCHEMICAL REACTION SENSITIZED BY DYES IN HETEROGENEOUS PHASE
Authors: Maruyama Kazuhiro , Narita Noritsugu
Published: July 2006

A photosensitized reaction of 2-acyl-1,4-benzoquinone 1 by rose bengal in a homogeneous system afforded the dimer 2 in a good yield. Even in the reactions in heterogeneous systems using rose bengal bound on the surface of silica gel particles, the same dimer was obtained in the comparable yields with those in a homogeneous system, but at a slower rate.
A NOVEL FRAGRANT TRICYCLIC KETONE FROM SANTANOLIDE
Authors: Inayama Seiichi , Singh Ashok Kumar , Kawamata Takeshi , Hirose Tadaaki , Iitaka Yoichi
Published: July 2006

(+)-1β,3α,6αH-4α,7β,11-trimethyltricyclo[5.4.13,6.01,7]dodec-10-en-5-one (3) was obtained together with trimethylethanoadamantanone (2) by an unusual reaction of 3-deoxyhexahydrosantonin (1). The structure, conformation and absolute configuration of 3 was determined by X-ray diffraction and CD/ORD spectrometry.
NOVEL ALKYL- AND PHENYLTHIOMETHYLATION OF AROMATIC COMPOUNDS
Authors: Suzuki Kunio , Sekiya Minoru
Published: July 2006

It has been found that the Mannich bases, of which methylene is linked to amine nitrogen and alkyl- or phenylmercapto-sulfur affect smoothly, in the presence of acid catalyst, alkyl- or phenylthiomethylation of a number of aromatic compounds, i.e. 2-naphthol, aniline, indole and their derivatives.
REACTION OF BUTANE TO ISOBUTANE CATALYZED BY IRON OXIDE TREATED WITH SULFATE ION. SOLID SUPERACID CATALYST
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

Solid acid catalysts were obtained by exposing Fe(OH)3 or Fe2O3 to 0.1–0.5 N H2SO4 and then calcining in air at 500°C. Fe(OH)3 used was prepared by hydrolyzing FeCl3 or Fe(NO3)3 with ammonia, and Fe2O3 by decomposing Fe(NO3)3 at 200°C. These catalysts were active for the skeletal isomerization of butane at room temperature or 0°C.
A MILD AND CONVENIENT METHOD FOR THE PREPARATION OF METHYLTHIOMETHYL ETHERS: PROTECTION OF HYDROXYL GROUPS
Authors: Suzuki Kenji , Inanaga Junji , Yamaguchi Masaru
Published: July 2006

Methylthiomethyl (MTM) ethers of various types of alcohols were prepared under mild conditions by using chloromethyl methyl sulfide and silver nitrate.
REACTION OF RIFAMYCIN S WITH 1,3,5-TRI-t-BUTYLHEXAHYDRO-1,3,5-TRIAZINE
Authors: Tsukamoto Goro , Aikawa Norio , Taguchi Masahiro
Published: July 2006

Rifamycin S and 25-O-desacetylrifamycin S were found to react with 1,3,5-tri-t-butylhexahydro-l,3,5-triazine to give deep-blue compounds. The structures of these compounds are discussed in comparison with those of “so-called deep-blue compounds” reported by earlier workers.
A SYNTHESIS OF dl-ISORETRONECANOL
Authors: Iwashita Takashi , Kusumi Takenori , Kakisawa Hiroshi
Published: July 2006

Isoretronecanol was stereoselectively synthesized using 1,3-dipolar addition of pyrroline oxide to dihydrofuran and a new cyclization of δ-amino alcohol to pyrrolidine.
2-AMINATION OF 1,4-DIHYDROXYANTHRAQUINONE PROMOTED BY COPPER IONS
Authors: Matsuoka Masaru , Makino Yoshinobu , Yoshida Katsuhira , Kitao Teijiro
Published: July 2006

2-Amination of 1,4-dihydroxyanthraquinone(DHAQ) was initiated by the formation of copper complex, which was oxidized to quinizarinquinone followed by the Michael addition of amines. Quantitative 2-amination of quinizarinquinone and reduction of copper ions to metal copper supported the mechanism.
FACILE PREPARATION OF CYCLIC ETHERS BY OXYSELENATION OF DIOLEFINS
Authors: Uemura Sakae , Toshimitsu Akio , Aoai Toshiaki , Okano Masaya
Published: July 2006

Reaction of several diolefins with phenylselenocyanate and copper(II) chloride in aqueous acetonitrile afforded various cyclic ethers having two phenylseleno groups in 42–88% yield. Hydroxyselenation of one double bond, followed by intramolecular oxyselenation on the other double bond, seems to be the reaction pathway.
ω-HYDROXYGERANYLFARNESOL, A NEW C25 ISOPRENOID ALCOHOL, ISOLATED FROM INSECT WAX
Authors: Quijano L , Calderón J S , Ríos Tirso
Published: July 2006

Further investigation of the insect wax of Ceroplastes albolineatus afforded a new sesterterpene, ω-hydroxygeranylfarnesol.
SYNTHESIS AND DEFECT STRUCTURE OF SrLa2(Mg2W2)O12 AND Sr2La2(MgW2)O12
Authors: Torii Yasuyoshi
Published: July 2006

SrLa2(Mg2W2)O12 crystallizes in an orthorhombic perovskite structure, showing a NaCl-type ordering as well as an ordering of A-site vacancies, whereas Sr2La2(MgW2)O12 has a 12-layer hexagonal structure with octahedral-site vacancies. This indicates that the formed structures are closely related to the sites where cation vacancies occur.
ANODIC OXIDATION OF 4-HYDROXYCINNAMIC ACIDS
Authors: Iguchi Masanobu , Nishiyama Atsuko , Eto Hideo , Terada Yukimasa , Yamamura Shosuke
Published: July 2006

Anodic oxidation of 4-hydroxycinnamic acids was carried out at a controlled potential vs. SCE (+900 or 840 mV), using an undivided cell, to afford the corresponding asatone or isoasatone-type compound as well as pinoresinol-type dilactones. In these oxidation reactions, relative ratio of the two dimerization products remarkably depends on the starting acids concentration.
ANOMALOUS SUBSTITUENT EFFECT ON ACTIVATION VOLUME OF ACETOLYSIS OF 2-METHYL-2-(p-SUBSTITUTED PHENYL)PROPYL TOSYLATES
Authors: Sera Akira , Yamada Hiroaki , Yasuda Tetsuro
Published: July 2006

The acetolysis rates of 2-methyl-2-(p-substituted phenyl)propyl tosylates at 75 °C have been determined at various pressure and the activation volumes were calculated. The activation volume of this solvolysis showed an unexpected substituent dependence, being more negative for faster solvolyzing substrates.
ONE-POT TRANSFORMATION OF KETONES TO α,β-UNSATURATED NITRILES VIA TRIMETHYLSILOXY NITRILES
Authors: Oda Masaji , Yamamuro Akira , Watabe Takashi
Published: July 2006

Treatment of ketones with trimethylsilyl cyanide in benzene in the presence of a Lewis acid (ZnI2) as a catalyst and subsequent heating after addition of pyridine and phosphoryl chloride have given α,β,-unsaturated nitriles in good yields, providing a general one-pot preparation of α,β,-unsaturated nitriles from ketones.
TOTAL SYNTHESIS OF (±)-FURANOEREMOPHILANE-3,6-DIONE AND (±)-LIGULARONE BY A ROUTE INVOLVING ALKYLATION OF 2,4-DIMETHYL-3-FUROIC ACID
Authors: Tada Masahiro , Sugimoto Yayoi , Takahashi Takeyoshi
Published: July 2006

Treatment of a dianion generated from 2,4-dimethyl-3-furoic acid with 3-methoxy-2-methyl-2-cyclohexen-1-one gave 4-methyl-2-(3-oxo-2-methyl-1-cyclohexenylmethyl)-3-furoic acid. Catalytic hydrogenation of the alkylated product followed by dehydrative annelation yielded 14-norfuranoeremophilane-4,6-dione, which was converted in five steps into (±)-furanoeremophilane-3,6-dione. (±)-Ligularone has been derived from the 3,6-dione.
DEHYDROGENATION OF HYDRAZOBISCYCLOHEXANENITRILE AND HYDRAZOBISISOBUTYRONITRILE BY POTASSIUM FERRICYANIDE IN THE PRESENCE OF CARBON BLACK
Authors: Tsubokawa Norio , Takeda Naoki
Published: July 2006

In the presence of carbon black, the two-phase dehydrogenation of hydrazobiscyclohexanenitrile and hydrazobisisobutyronitrile in organic solvent by an aqueous solution of potassium ferricyanide gave the corresponding azo-compound in a good yield. It became apparent that the two-phase dehydrogenation of the hydrazines was catalyzed by phenolic hydroxyl groups on the carbon black surface.
OXIDATION OF AMINES TO CARBONYL COMPOUNDS BY PYRIMIDO[4,5-b]QUINOLINE-2,4(3H,10H)-DIONE (5-DEAZAFLAVIN)
Authors: Yoneda Fumio , Sakuma Yoshiharu , Kadokawa Yoko , Koshiro Akira
Published: July 2006

Pyrimido[4,5-b]quinoline-2,4(3H,10H)-dione (5-deazaflavin) oxidized amines under aqueous conditions to give the corresponding carbonyl compounds. This 5-deazaflavin-dependent oxidation of amines was automatically recycled and gave more than 100% of carbonyl compounds based on the 5-deazaflavin.
PHOTOISOMERIZATION OF PHTHALOYL SYSTEM TO ALKYLIDENE PHTHALIDES
Authors: Maruyama Kazuhiro , Osuka Atsuhiro , Suzuki Hitomi
Published: July 2006

Irradiation of a benzene solution of bicyclic diketones 3 and/or 4 gave alkylidene phthalides 5 and 6 in good yields. Structural effects on the photoisomerization were discussed.
SYNTHESIS OF UNSYMMETRICAL PERYLENEBIS(DICARBOXIMIDE) DERIVATIVES
Authors: Nagao Yukinori , Ishikawa Narumi , Tanabe Yoriko , Misono Takahisa
Published: July 2006

Unsymmetrical perylenebis(dicarboximide) derivatives—N-alkyl-N′-aryl-3,4:9,10-perylenebis (dicarboximide) (5a–e, 6a–e, 7a–e, 8a–e, and 9a–e)—were prepared by the condensation of N-alkyl-3,4:9,10-perylenetetracarboxylic monoanhydride monoimide(4a–e) with arylamines (aniline, p-toluidine, p-anisidine, and 3,5-xylidine etc.).
A NEW RING TRANSFORMATION OF ISOXAZOLO[3,4-d]PYRIMIDINES INTO PYRIMIDO[4,5-d]PYRIMIDINES
Authors: Yoneda Fumio , Yano Tetsumi , Higuchi Masatsugu , Koshiro Akira
Published: July 2006

The treatment of isoxazolo[3,4-d]pyrimidines with benzylamines and 4-picolylamine caused ring expansion to the respective pyrimido-[4,5-d]pyrimidines by intramolecular cycloaddition of 1,5-diazahexatriene intermediates. Reaction mechanism of this ring transformation will be discussed.
REACTIONS OF p-TOLUENESULFONYL CHLORIDE WITH STYRENES CATALYZED BY DICHLOROTRIS(TRIPHENYLPHOSPHINE)RUTHENIUM(II)
Authors: Kamigata Nobumasa , Sawada Hideo , Kobayashi Michio
Published: July 2006

In the presence of dichlorotris(triphenylphosphine)ruthenium(II) p-toluenesulfonyl chloride was found to react with styrenes under mild reaction conditions to give alkenyl sulfones in good yields. The reaction was highly regio- and stereoselective and formed only β-hydrogen-substituted (E)-isomers.
TOTAL SYNTHESIS OF RACEMIC LIGULARONE AND ISOLIGULARONE
Authors: Miyashita Masaaki , Kumazawa Toshiaki , Yoshikoshi Akira
Published: July 2006

Racemic ligularone and isoligularone were synthesized from 8α,8aα-dimethyl-1,3-dioxo-1,2,3,4,4aα,5,6,7,8,8a-decahydronaphthalene, which was stereoselectively derived from 8aα-methyl-1,6-dioxo-1,2,3,4,4aα,5,6,8a-octahydronaphthalene, using the KF-catalyzed reaction with 1-nitro-1-phenylthiopropene.
ADDITION OF ORGANOALUMINATES TO ACROLEIN OR METHYL VINYL KETONE IN THE PRESENCE OF A STOICHIOMETRIC AMOUNT OF COPPER(II) ACETATE. A CONVENIENT ROUTE TO KETONES AND ALDEHYDES FROM OLEFINS VIA HYDROALUMINATION
Authors: Sato Fumie , Oikawa Takeshi , Sato Masao
Published: July 2006

Organoaluminates, readily prepared by TiCl4-catalyzed hydroalumination of olefins with LiAlH4, react with acrolein or methyl vinyl ketone in the presence of a stoichiometric amount of copper(II) acetate to give the 1,4-addition product in excellent yield. The facile reactions offer a convenient method for the preparation from olefins of the corresponding aldehydes or ketones.
PREPARATION OF 5-TRIMETHYLSILOXYOXAZOLES FROM 2-OXAZOLIN-5-ONES AND THEIR DIELS–ALDER REACTION: SYNTHESIS OF VITAMIN B6 DERIVATIVES
Authors: Takagaki Hidetsugu , Yasuda Nobuyoshi , Asaoka Morio , Takei Hisashi
Published: July 2006

Various 5-trimethylsiloxyoxazoles were synthesized by the silylation of 2-oxazolin-5-ones using chlorotrimethylsilane and triethylamine in high yields. Diels–Alder reaction of the siloxyoxazoles with N-phenylmaleinimide or dimethyl maleate afforded the corresponding substituted pyridines in high yields. This method was applied to the synthesis of Vitamin B6 derivatives starting from N-formylalanine.
STEREOSPECIFIC TOTAL SYNTHESES OF THE THREE DIASTEREOISOMERS OF CYCLOEUDESMOL
Authors: Ando Masayoshi , Sayama Shinsei , Takase Kahei
Published: July 2006

The stereospecific total syntheses of the three diastereoisomers of cycloeudesmol (Ia, Ib, and Ic) were carried out with the object of establishing the structure of cycloeudesmol.
PYROLYSIS OF β-HYDROXY-α-BROMOSULFOXIDES: A SIMPLE SYNTHESIS OF BROMOMETHYL KETONES
Authors: Reutrakul Vichai , Tiensripojamarn Angkana , Kusamran Kosan , Nimgirawath Surachai
Published: July 2006

The reaction of lithio bromomethyl phenyl sulfoxide with aldehydes gave the corresponding β-hydroxy-α-bromosulfoxides. Pyrolysis of these hydroxysulfoxides yielded the expected bromemethyl ketones in excellent yields.
BASE INDUCED, INTRAMOLECULAR CYCLIZATION WITH OXIDATION IN 9-DIALKYLAMINO-1-ALKYLAMINO-PHENALENIUM IONS
Authors: Franz Klaus-D
Published: July 2006

Alkylation of 9-methylamino-1-methyliminophenalene, (1), gives 1, 9-disubstituted phenalenium salts, (2a,b), which can be cyclized to (4a,b) in the presence of amine and oxygen forming a new N–C bond. A possible mechanism with a Mannich Base type intermediate is discussed. The structure of the new compounds is deduced from their 1H- and 13C-NMR spectra.
ONE-STEP SYNTHESIS OF 3-DIALKYLAMINOINDOLIZINES
Authors: Ohsawa Akio , Abe Yoshihito , Igeta Hiroshi
Published: July 2006

3-Dialkylaminoindolizines, pyrrolo[1,2-a]quinoline, pyrrolo[2,1-a]isoquinoline, and 2-methyl-pyrrolo[1,2-b]pyridazine were obtained from the corresponding α-halo-azaaromatics, propargyl alcohol and secondary amines in the presence of catalytic amounts of Pd(PPh3)2Cl2 and CuI.
FLUORESCENCE OF CHLOROTOLUENE VAPORS
Authors: Shimoda Akira , Hikida Takumi , Ichimura Teijiro , Mori Yuji
Published: July 2006

Fluorescence spectra, fluorescence quantum yields, and fluorescence lifetimes were measured for o-, m- and p-chlorotoluene vapor. The radiative and non-radiative processes of excited chlorotoluene molecules are predominantly determined by the chlorine substitution and only slightly by the methyl substitution. The effect of the excess energy of excitation on the radiative and non-radiative transition rates is discussed in relation to the methyl and chlorine substitutions.
STRUCTURES OF NEW PLASTOQUINONES FROM THE BROWN ALGA SARGASSUM SERRATIFOLIUM
Authors: Kusumi Takenori , Shibata Yoshiko , Ishitsuka Midori , Kinoshita Takeshi , Kakisawa Hiroshi
Published: July 2006

The structures of sargaquinoic acid and sargaquinal, new plastoquinones isolated from the brown alga Sargassum serratifolium, were elucidated as 1a and 2.
NEW BROMO ACETAL FROM THE MARINE ALGA, LAURENCIA NIPPONICA YAMADA (1)
Authors: Suzuki Teruaki , Kurosawa Etsuro
Published: July 2006

The novel skeletal component, laureacetal-B, having bromine and cyclic acetal, has been isolated from the marine alga, Laurencia nipponica Yamada (Japanese name; Urasozo). Its structure was established by its physical properties and the chemical transformations.
THE MECHANISM OF SULFOXIDE HALOGENATION
Authors: Klein Joseph
Published: July 2006

A general mechanism for the halogenation of open-chain and cyclic sulfoxides is proposed. This mechanism gives an account for all the seemingly contradictory experimental results found by various groups, including the chirality of the products.
A NOVEL HIGH NUCLEARITY PLATINUM ISOCYANIDE CLUSTER
Authors: Yanamoto Yasuhiro , Aoki Katsuyuki , Yamazaki Hiroshi
Published: July 2006

A new isocyanide cluster of platinum, Pt7(C9H9N)12, was prepared by reduction of dichloro-bis(2,6-xylyl isocyanide)platinum(II) with sodium amalgam.
ADDITION REACTIONS OF α-DIMETHYLAMINONITRILES WITH ACRYLONITRILE: A SIMPLE SYNTHESIS OF γ-KETONITRILES
Authors: Reutrakul Vichai , Nimgirawath Surachai , Panichanun Sirichai , Ratananukul Piniti
Published: July 2006

The reaction of the anion derived from α-dialkylaminonitriles with acrylonitrile, followed by hydrolysis with aqueous acids or cupric sulfate in 95% ethanol gave γ-ketonitriles in good yields. This procedure is highly convenient for the synthesis of various γ-ketonitriles.
RAMAN AND RESONANCE RAMAN SPECTRA OF SULFUR-BRIDGED BINUCLEAR MOLYBDENUM(V) COMPLEXES OF CYSTEINE-CONTAINING CHELATE ANIONS
Authors: Ueyama Norikazu , Nakata Michio , Araki Takeo , Nakamura Akira , Yamashita Shinsuke , Yamashita Takuya
Published: July 2006

μ-Disulfido-dioxodimolybdenum(V) complexes of (Cys)2−, (Cys-OMe)−, (Ac-Cys)2−, (Glutathione)2− anions exhibit strong Raman bands at 930–950 cm−1 and 420 cm−1 assignable respectively to Mo=O and Mo–Sbridge stretching vibrations. The resonance Raman spectra provide an excitation profile which is useful for assigning the broad electronic absorption due to the (Remark: Graphics omitted.) moiety.
HYPER RAMAN SPECTRUM OF CYCLOHEXANE
Authors: Hiraya Atsunari , Udagawa Yasuo , Ito Mitsuo
Published: July 2006

Hyper Raman spectrum of liquid cyclohexane was observed with frequency doubled YAG laser as an exciting source. In addition to the counterparts of ir absorption bands, a strong band was observed at 1107 cm−1 and assigned to an a1u vibration, which was forbidden both in ir and Raman and allowed in hyper Raman.
HOMOGENEOUS PERMANGANATE OXIDATION IN NON-AQUEOUS ORGANIC SOLUTION. SELECTIVE OXIDATIONS OF OLEFINS INTO 1,2-DIOLS OR ALDEHYDES
Authors: Ogino Toshio , Mochizuki Kazunori
Published: July 2006

Potassium permanganate solubilized in dichloromethane by use of equimolar amount of triethylbenzylammonium chloride smoothly oxidized olefins to give homogeneous dark brown reaction mixtures, which were then selectively decomposed into either 1,2-diols or aldehydes in good yields by treatment with aqueous solutions depending upon pH.
THE IMPROVED METHOD OF HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC SEPARATION OF INDIVIDUAL BILE ACIDS: FREE AND GLYCINE-CONJUGATED BILE ACIDS
Authors: Okuyama Sumihiko , Uemura Daisuke , Hirata Yoshimasa
Published: July 2006

The improved method of high performance liquid chromatographic separation of bile acids, free and conjugated with glycine, is described. The analysis of free and glycine-conjugated bile acids is based on the esterification of the carboxylic group of bile acids with 4-bromomethyl-7-methoxycoumarin (BMC). These derivatives of bile acids can be separated by high performance liquid chromatography and detected on high sensitivity with a fluorescence detector.
CRYSTALLINE COMPLEXES OF POLY(OXYETHYLENE) DERIVATIVES WITH LANTHANOIDS
Authors: Hirashima Yoshiyuki , Shiokawa Jiro
Published: July 2006

The crystalline complexes of poly (oxyethylene) derivatives (HO(CH2CH2O)nH, n=2–7; CH3O(CH2CH2O)4CH3) with lanthanoid nitrates were prepared. The well-defined complexes have the composition of ligand:metal =1:1 or 1:2. The stability of the complex seems to decrease with increasing atomic number of the lanthanoid.
TOTAL SYNTHESIS OF (±)-ANNONENE, A TRANS-CLERODANE DITERPENE
Authors: Takahashi Satoru , Kusumi Takenori , Kakisawa Hiroshi
Published: July 2006

Total synthesis of (±)-annonene, 1-[2-(3-furanyl)ethyl]-1,2,3,4,4a,7,8,cis-8a-octahydro-1,trans-2,trans-4a,5-tetramethylnaphthalene, which is a trans-clerodane diterpene, is described.
ADDITION REACTION OF 4-METHYLENE-4H-HOMOCHROMENE DERIVATIVES WITH TETRACYANOETHYLENE. POSSIBLE INTERVENTION OF A BENZOHOMOPYRYLIUM ION INTERMEDIATE
Authors: Yamaoka Hiroshi , Yamada Yoshiaki , Ono Susumu , Hanafusa Terukiyo
Published: July 2006

Vinylcyclopropane derivatives could be synthesized with one-pot procedure from α,β-unsaturated thione (chromothione) derivatives by dimethyloxosulfonium methylide. Extremely facile addition of tetracyanoethylene with 4-methylene-4H-homochromenes gave dihydrobenzoxazepine derivatives. The reaction may be well interpreted with the homoaromatic stabilization of the cationic part in a zwitterionic intermediate which would be formed at the rate-determining step.
HIGHLY SELECTIVE VINYL REARRANGEMENT IN THE REACTION OF ISOPRENE BROMOHYDRIN AND ALLYLIC GRIGNARD REAGENTS
Authors: Butsugan Yasuo , Kadosaka Itsuo , Araki Shuki
Published: July 2006

The reaction of isoprene bromohydrin (1-bromo-2-methyl-3-buten-2-ol) (1) with various allylic Grignard reagents in the presence of cuprous iodide gave vinyl group rearranged products (2) highly selectively.
HOMOLYTIC HALOGENATION OF TOLUENE WITH N-HALOSULFOXIMIDES
Authors: Akasaka Takeshi , Furukawa Naomichi , Oae Shigeru
Published: July 2006

Homolytic bromination of toluene with diphenyl N-bromosulfoximide (1) proceeded readily by ultraviolet irradiation or by thermal reaction in the presence of a radical initiator to afford benzyl bromide. However, chlorination of toluene was sluggish with diphenyl N-chlorosulfoximide (2) and methyl phenyl N-chlorosulfoximide (3). α-Bromination was interpreted in terms of a chain process involving bromine molecule like the “Goldfinger mechanism”, but not via that involving the sulfoximidoyl radical.
LITHIUM THIOALKYNOLATES AND ITS REACTION WITH CARBONYL COMPOUNDS
Authors: Miyaura Norio , Yanagi Teiji , Suzuki Akira
Published: July 2006

The reaction of ketones with lithium thioalkynolates readily obtainable from corresponding acetylides and sulfur, followed by thermolysis gives trisubstituted olefins.
SELECTIVE BUTYLAMINATION OF 5,8-DIHYDROXY-1,4-NAPHTHOQUINONE PROMOTED BY COPPER SALTS
Authors: Matsuoka Masaru , Takei Toshio , Kitao Teijiro
Published: July 2006

Selective butylamination promoted by copper salts was observed on the reaction of 5,8-dihydroxy-1,4-naphthoquinone(DHNQ) with butylamine. A novel β-butylamination of DHNQ proceeded in the presence of copper salts. A number of β-butylaminated naphthoquinone derivatives were conveniently obtained.
SYNTHESIS AND CONFORMATION OF R-(+)-2-(α-PHENYLETHYL)BENZOPHENONE
Authors: Ako Masayuki , Takenaka Shunsuke
Published: July 2006

As a model of chiral benzophenone, R-(+)-2-(α-phenylethyl)benzophenone was prepared. The NMR and optical data indicate that rotations of the benzoyl and α-phenylethyl moieties are unrestricted in the range of −100 to 150°C, and therefore benzophenone skeleton is not chiral. A preferable conformation is discussed.
CRYSTAL-LIQUID CRYSTAL PHASE TRANSFORMATION AND WATER PERMEABILITY OF ARTIFICIAL AMPHIPHILES AS BIOMEMBRANE MODEL
Authors: Kajiyama Tisato , Kumano Atsushi , Takayanagi Motowo , Okahata Yoshio , Kunitake Toyoki
Published: July 2006

Artificial ammonium amphiphiles with monoalkyl and dialkyl groups form the multilamellar liposome composed of the bimolecular layer. Artificial amphiphiles have characteristics of both thermotropic and lyotropic mesomorphisms. The diffusive permeability of the polymer/artificial amphiphiles composite membrane to water exhibits a distinct jump in the vicinity of the crystal-mesomorphic phase transition temperature.
MOLECULAR MOTION-PERMEABILITY RELATIONSHIPS IN POLYCARBONATE/LIQUID CRYSTAL (EBBA) COMPOSITE MEMBRANE
Authors: Kajiyama Tisato , Nagata Yasuhisa , Maemura Eiji , Takayanagi Motowo
Published: July 2006

The diffusive permeability coefficient to water for the polymer/EBBA composite membrane reveals a distinct jump in the vicinity of the crystal-liquid crystal phase transition temperature of EBBA. The permeability coefficients to hydrocarbon gases increase 100∼200 times over several degrees in the phase transition temperature range.
SYNTHESIS AND MAGNETIC PROPERTY OF COBALT(II)-MANGANESE(II) AND COBALT(II)-IRON(II) HETERO-METAL COMPLEXES WITH N,N′-BIS(3-CARBOXYSALICYLIDENE)ALKANEDIAMINES
Authors: Torihara Naoyuki , Okawa Hisashi , Kida Sigeo
Published: July 2006

CoMn(fsaen)(py)3, CoMn(fsapn)(py)3 and CoFe(fsapn)(py)3 (H fsaen=N,N′-bis(3-carboxysalicylidene)ethylenediamine, H4fsapn=N,N′-bis(3-carboxysalicylidene)propylenediamine) were synthesized and characterized. Cryomagnetic measurements indicated no spin-exchange interaction operating between the low-spin cobalt(II) and high-spin manganese(II) or iron(II) ions.
SYNTHETIC METHOD OF FUNCTIONALIZED UNSYMMETRICAL SULFIDES AND DISULFIDES USING DIPHENYLPHOSPHINODITHIOATES
Authors: Yoshifuji Masaaki , Hanafusa Fumito , Inamoto Naoki
Published: July 2006

Various kinds of diphenylphosphinodithioates were prepared and allowed to react with some organolithium compounds under mild reaction conditions to give functionalized unsymmetrical sulfides and disulfides in good yields.
PREPARATION OF A NOVEL AMMINEBROMOCYANO[1,4,7-TRIAZACYCLONONANE]COBALT(III) COMPLEX
Authors: Shimba Satoru , Fujinami Shuhei , Shibata Muraji
Published: July 2006

A new complex [Co(Br)(CN)(NH3)(1,4,7-triazacyclononane)]Cl, which exhibits a novel optical isomerism due to the arrangement of unidentate ligands, has been prepared, and the optical resolution of the complex has been achieved by means of column chromatography.
SYNTHESIS OF OPTICALLY ACTIVE 4-AMINO-2-(HYDROXYMETHYL)TETRAHYDROFURAN-4-CARBOXYLIC ACIDS
Authors: Yoshimura Juji , Kondo Shiro , Ihara Masaki , Hashimoto Hironobu
Published: July 2006

It was proved that optically active 4-amino-2-(hydroxymethyl)tetrahydrofuran-4-carboxylic acid (1) isolated from acid hydrolysate of diabetic urine has (2S,4S) configuration by synthesis of (2S)-diastereomers from d-ribose.
RACEMIZATION IN PEPTIDE SYNTHESIS BY THE UGI REACTION
Authors: Waki Michinori , Minematsu Yoshihiro , Meienhofer Johannes , Izumiya Nobuo
Published: July 2006

The Izumiya test for racemization in peptide synthesis was applied to examine the effect of solvent and temperature on racemization in the synthesis of a tripeptide derivative by the Ugi reaction (four-component condensation). Almost no racemization was observed under the reaction conditions using methanol and at low temperature.
REGIO- AND STEREOCONTROLLED POLYPRENYLATION OF QUINONES. A NEW SYNTHETIC METHOD OF COENZYME Q2, Q3, Q9, AND Q10
Authors: Naruta Yoshinori , Maruyama Kazuhiro
Published: July 2006

A new regio- and stereocontrolled synthesis of coenzyme Qn (n=2, 3 9, 10) is described. Coupling of geranyltrimethyltin with 2,3-dimethoxy-5-methylbenzoquinone was successfully undertaken in the presence of BF3·OEt2. After oxidation of the resulting mixture coenzyme Q2 was obtained in 90% overall yield with >99% Δ2-trans stereochemistry. Similary, all- trars-coenzyme Q9 and Q10 were obtained in reasonable yields.
TRITHIOPEROXYBENZOATO(η3-DITHIOBENZOATO)OXOMOLYBDENUM(IV), MoO(S3CPh)(η3-S2CPh): SYNTHESIS AND X-RAY MOLECULAR STRUCTURE
Authors: Tatsumisago Masahiro , Matsubayashi Gen-etsu , Tanaka Toshio , Nishigaki Satoshi , Nakatsu Kazumi
Published: July 2006

The titled novel complex was obtained by the reaction of sodium molybdate(VI) dihydrate with diethylammonium dithiobenzoate in an acidic aqueous medium. An X-ray structure analysis of this complex has revealed the presence of trithioperoxybenzoato and η3 -dithiobenzoato ligands both coordinated to oxomolybdenum(IV).
MAGNETIC BEHAVIOR OF FIVE-COORDINATE COBALT(III) COMPLEX OF α,β,γ,δ-TETRAPHENYLPORPHIN
Authors: Yamamoto Kiyoko , Uzawa Jun , Chijimatsu Tamiko
Published: July 2006

1H NMR spectrum of chloro-α,β,γ,δ-tetraphenylporphinatocobalt(III) in inert solvent was found to show unusual temperature dependence. The signals became broad by raising the temperature in reversible manner. The compound is diamagnetic in solid state, and the observed temperature dependence was attributed to the partial transformation of the compound in the solution to a paramagnetic species with increased temperature. The formation of paramagnetic species was verified by magnetic moment measurement in the same solution.
ASYMMETRIC HYDROGENATION OF α-ACYLAMINOCINNAMIC ACID DERIVATIVES CATALYZED BY AMINOPHOSPHINE-RHODIUM COMPLEX. INVERSION IN THE STEREOSELECTIVITY OF THE AMINOPHOSPHINE-RHODIUM COMPLEX CATALYST BY N-METHYLATION OF THE LIGAND
Authors: Onuma Ken-ichi , Ito Tomiyasu , Nakamura Asao
Published: July 2006

Marked difference in the stereoselectivity of the rhodium complex with (1R,2R)-bis(diphenylphosphinamino)cyclohexane caused by N-methylation of the ligand in the asymmetric hydrogenation of α-acylaminocinnamic acid derivatives is described.
DIRECT CONVERSION OF ARYLAMINES TO THE CORRESPONDING HALIDES, BIPHENYLS AND SULFIDES WITH t-BUTYL THIONITRATE
Authors: Oae Shigeru , Shinhama Koichi , Kim Yong Hae
Published: July 2006

Reactions of various arylamines with t-butyl thionitrate gave various deaminative substitution products in good yields. t-Butyl thionitrate was found to be a better deaminative reagent than alkyl nitrites.
SYNTHESIS AND STEREOCHEMISTRY OF α-BISABOLOL
Authors: Iwashita Takashi , Kusumi Takenori , Kakisawa Hiroshi
Published: July 2006

Intramolecular addition reaction of nitrone (3) derived from (6E)-farnesal and N-methylhydroxylamine afforded isoxazolidines (4a, 4b), methyl amino group of which was removed by a series of reactions to obtain the stereoisomer (8) of α-bisabolol. Synthesis from (6Z)-farnesal by the same method afforded α-bisabolol, which established the stereochemistry of (−)-α-bisabolol as (17).
A NEW ALLYLATION REACTION OF THE COPPER(I) SALT OF ENAMINES WITH 2-ALLYLOXYBENZIMIDAZOLES
Authors: Yamaguchi Masahiko , Murakami Masahiro , Mukaiyama Teruaki
Published: July 2006

The allylation of the copper(I) salt of enamines with 2-allyloxybenzimidazoles followed by hydrolysis afforded unsaturated ketones in good yields.
AZO-CROWN ETHERS. THE DYES WITH AZO GROUP DIRECTLY INVOLVED IN THE CROWN ETHER SKELETON
Authors: Shiga Masanobu , Takagi Makoto , Ueno Keihei
Published: July 2006

Crown-type polyether azo dyes 1∼3 were synthesized, and the ion-pair extraction of sodium and potassium ion was studied. The extraction behavior resembles those of benzo-type crown ethers, but changes on light illumination due to trans–cis isomerization of the dyes. The cis-form lacks the affinity to metal ions.
APPLICATION OF PHOTOACOUSTIC SPECTROSCOPY FOR IN SITU MEASUREMENT OF SEMICONDUCTOR ELECTRODE REACTIONS
Authors: Masuda Hideki , Fujishima Akira , Honda Kenichi
Published: July 2006

An application of photoacoustic spectroscopy (PAS) for semiconductor electrode reactions is described. A cathodic decomposition of a CdS single crystal electrode and an electrochemical deposition of Cd2+ on the CdS electrode were measured by PAS technique in situ.
FORMATION OF DISK-LIKE AGGREGATES FROM SINGLE-CHAIN PHOSPHOCHOLINE AMPHIPHILES IN WATER
Authors: Okahata Yoshio , Ihara Hirotaka , Shimomura Masatsugu , Tawaki Shin-ichiro , Kunitake Toyoki
Published: July 2006

Single-chain phosphocholine amphiphiles which possess rigid segments in the hydrophobic portion formed disk-like aggregates, which are different from lecithin vesicles. When the rigid segment was azobenzene unit, trans-to-cis isomerization changed some membrane characteristics.
HIGHLY STEREOSELECTIVE SYNTHESIS OF TRISUBSTITUTED OLEFINS FROM ALKENYL ARYL SULFOXIDES
Authors: Takei Hisashi , Sugimura Hideyuki , Miura Morikazu , Okamura Hisashi
Published: July 2006

Alkenyl aryl sulfoxides could be alkylated stereoselectively via their lithium salts to afford α-alkylated (E)-alkenyl sulfoxides. Reduction of the sulfoxides to the corresponding sulfides followed by nickel–phosphine complexes catalyzed coupling reaction with Grignard reagents gave trisubstituted olefins.
STRUCTURE OF (+)-KJELLMANIANONE, A HIGHLY OXYGENATED CYCLOPENTENONE FROM THE MARIN ALGA, SARGASSUM KJELLMANIANUM
Authors: Nakayama Mitsuru , Fukuoka Yoshie , Nozaki Hiroshi , Matsuo Akihiko , Hayashi Shûichi
Published: July 2006

The structure and absolute configuration of a new cyclopentenone derivative, (+)-kjellmanianone, isolated from the brown alga Sargassum kjellmanianum has been determined as 5-carbomethoxy-5-hydroxy-3-methoxy-2-cyclopenten-1-one on the basis of the chemical and spectroscopic evidence and the X-ray analysis.
SYNTHESIS OF β-d-GLUCOPYRANOSYLVALIDAMINE: 2-O-β-d-GLUCOPYRANOSYL-1l-(1,3,4/2,6)-4-AMINO-6-HYDROXYMETHYL-1,2,3-CYCLOHEXANETRIOL
Authors: Ogawa Seiichiro , Shibata Yasuhito , Chida Noritaka , Suami Tetsuo
Published: July 2006

β-d-Glucopyranosylvalidamine (1a), the structure of which was assigned to the degradation product of validamycin A, was synthesized by condensation of a protected validamine (8) with acetobromoglucose, followed by deblocking. Unexpectedly, 1a was found not to be identical with an authentic sample derived from the antibiotic.
SYNTHESIS AND SOME REACTIONS OF 1-ADAMANTYL TRIFLUOROMETHANESULFONATE
Authors: Takeuchi Ken’ichi , Moriyama Takamasa , Kinoshita Tomomi , Tachino Hitoshi , Okamoto Kunio
Published: July 2006

1-Adamantyl trifluoromethanesulfonate (1) has been prepared from 1-bromoadamantane and silver trifluoromethanesulfonate in 2,2-dimethylbutane. The trifluoromethanesulfonate (1) abstracts hydride from pentane or hexane to form adamantane, initiates ring-opening polymerization of tetrahydrofuran, and reacts with alkyllithiums to afford 1-alkyladamantanes.
STRUCTURE OF SARGASSUMLACTAM, A NEW β,γ-UNSATURATED-γ-LACTAM, FROM THE MARINE ALGA SARGASSUM KJELLMANIANUM
Authors: Nozaki Hiroshi , Fukuoka Yoshie , Matsuo Akihiko , Soga Osamu , Nakayama Mitsuru
Published: July 2006

A new dehydro-γ-lactam, sargassumlactam, has been isolated from the brown alga Sargassum kjellmanianum, and its structure was determined to be 4,5-dehydro-3-methoxy-3,5-dimethoxycarbonyl-2-pyrrolidone by the spectroscopic and X-ray diffraction analysis.
AN EFFICIENT METHOD FOR THE PREPARATION OF HOMOALLYLIC ALCOHOL DERIVATIVES BY THE REACTION OF ALLYL IODIDE WITH CARBONYL COMPOUNDS IN THE PRESENCE OF STANNOUS HALIDE
Authors: Mukaiyama Teruaki , Harada Taira , Shoda Shin-ichiro
Published: July 2006

Allyl iodide reacts in situ under mild conditions with stannous halide to form allyltin dihaloiodide, which in turn reacts with carbonyl compounds in an aprotic solvent to give the corresponding homoallylic alcohol derivatives in good yields.