bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOREDUCTION OF CARBONYLS WITH HYDROGEN SELENIDE. AN ESTIMATION OF THE HIGH HYDROGEN DONATING ABILITY OF HYDROGEN SELENIDE BY KINETIC STUDY AND CHEMICAL TRAPPING
Authors: Kambe Nobuaki , Kondo Kiyoshi , Sonoda Noboru
Published: July 2006

The rate constant for the photoreduction of acetophenone with hydrogen selenide in tetrahydrofuran was obtained as 4.7×108M−1s−1. It was also found that hydrogen selenide was able to trap short-lived excited carbonyls, and acyl or alkyl radicals generated in Norrish type I reaction.
CESIUM FLUORIDE-PROMOTED SYNTHESIS OF CARBOXYLIC ACID DERIVATIVES USING 2-FLUOROPYRIDINIUM SALT
Authors: Shoda Shin-ichiro , Mukaiyama Teruaki
Published: July 2006

In the presence of cesium fluoride, the equimolecular reactions of carboxylic acids with alcohols, amines or thiols using 2-fluoropyridinium salt proceeded smoothly under mild conditions to afford the corresponding carboxylic acid derivatives with base sensitive groups in good yields.
THREE NEW DAPHNIPHYLLUM ALKALOIDS WITH AN αβ,γδ-UNSATURATED ESTER GROUP FROM DAPHNIPHYLLUM GRACILE GAGE
Authors: Yamamura Shosuke , Lamberton J A , Niwa Masatake , Endo Keiko , Hirata Yoshimasa
Published: July 2006

Three new alkaloids have been isolated from the bark of Daphniphyilum gracile Gage, and their structures with an αβ,γδ-unsaturated ester group also been elucidated on the basis of their spectral and chemical properties. In addition, it is chemotaxonomically important that daphniphylline, one of the main alkaloids found in the Japanese species, has also been detected in this experiment, while this alkaloid has not been found in the leaves of the same plant.
THE ASYMMETRIC HYDROGENATION OF THE α-N-ACETYLAMINOCINNAMOYL DERIVATIVE OF AMINO ACIDS WITH CHIRAL BISPHOSPHINE–RHODIUM COMPLEX
Authors: Onuma Ken-ichi , Ito Tomiyasu , Nakamura Asao
Published: July 2006

An optical yield of the dipeptide obtained in the title reaction is affected by a chiral amino acid moiety in the substrate.
PREPARATION OF THE PERCHLORATE SALTS OF COBALT(III)- PORPHYRINS AND THEIR REACTIONS WITH VINYL ETHER
Authors: Sugimoto Hiroshi , Nagano Motoi , Yoshida Zen-ichi , Ogoshi Hisanobu
Published: July 2006

Cobalt(III) complexes of octaethylporphyrin(OEP) and tetraphenylporphyrin(TPP),[Co(III)(OEP)(L)2]ClO4;L=tetrahydrofuran(1),H2O(2) pyridine(3) and [Co(III)(TPP)(L)2]ClO4;L=H2O(4) ,pyridine(5) were synthesized. The reactions of (1),(2) and (4) with vinylethylether afforded organocobalt(III) complexes, whereas the reactions of (3) and (5) gave only reduced divalent complexes.
A SIMPLE, STEREOCONTROLLED SYNTHESIS OF α-ALKYLIDENE-γ-BUTYROLACTONES
Authors: Tanaka Kazuhiko , Tamura Norikazu , Kaji Aritsune
Published: July 2006

Treatment of γ-butyrolactone with bis[methoxy(thiocarbonyl)] disulfide in the presence of 2.2 equivalents of lithium diisopropylamide followed by the addition of aldehydes gave predominantly (E)-α-alkylidene-γ-butyrolactones. In contrast, when the reaction was carried out in the presence of metal salt such as cuprous iodide or zinc chloride, (Z)-α-alkylidene-γ-butyrolactone was obtained as the major product.
SUBSTITUENT EFFECTS ON THE PHOTOCURRENT QUANTUM YIELDS OF PARA-SUBSTITUTED TETRAPHENYLPORPHYRINS
Authors: Yamashita Kazuo , Miyoshi Keiko , Osuka Atsuhiro , Suzuki Hitomi
Published: July 2006

The photocurrent quantum yields of para-substituted tetraphenylporphyrins were found to be increased by electron-donating groups. Semi-logarithmic plots of the quantum yields vs. the half-wave potentials for the first ring oxidations of the porphyrins or the Hammett σ of substituents yielded a linear relationship.
BICYCLO[n.2.2]BRIDGEHEAD ALKENES, SYNTHESIS AND ELECTROPHILIC ADDITION OF ACETIC ACID
Authors: Sakai Yasuo , Tobe Yoshito , Odaira Yoshinobu
Published: July 2006

The synthesis of bicyclo[n, 2.2]bridgehead alkenes (2a) and (2b) by the solvolytic rearrangement of the corresponding tricyclic acetates (3a) and (3b) in acetic acid and the electrophilic addition of acetic acid to anti-Bredt olefin (2a) are described.
VALIDITY OF METHOXYCARBONYL AS AN N-PROTECTING GROUP IN PEPTIDE SYNTHESIS: NEW SYNTHESIS OF MSH-RELEASE INHIBITING FACTOR
Authors: Irie Hiroshi , Nakanishi Hiromi , Fujii Nobutaka , Mizuno Yukio , Fushimi Tamaki , Funakoshi Susumu , Yajima Haruaki
Published: July 2006

N-Methoxycarbonyl (MOC)-amino acids regenerate the parent amino acids by treatment with dimethyl sulphide and methanesulphonic acid. Synthesis of MSH-Release Inhibiting Factor was accomplished using MOC-amino acids and applying the above mentioned deblocking method.
SYNTHESIS OF OLEFINS BY NICKEL-CATALYZED DECARBONYLATION OF S-(2-PYRIDYL) THIOATES
Authors: Goto Toshio , Onaka Makoto , Mukaiyama Teruaki
Published: July 2006

S-(2-Pyridyl) thioates, especially derived from secondary and tertiary carboxylic acids, are decarbonylated by use of a catalytic amount of nickel chloride and zinc powder to give olefins in good yields.
ASYMMETRIC HYDROGENATION OF α-ACYLAMINOACRYLIC ACIDS AND ESTERS WITH AXIALLY DISSYMMETRIC BISAMINOPHOSPHINE–RHODIUM COMPLEXES
Authors: Miyano Sotaro , Nawa Masayoshi , Hashimoto Harukichi
Published: July 2006

From easily resolved 2,2′-diamino-1,1′-binaphthyl were prepared axially dissymmetric bisphosphine ligands, (R)- and (S)-2,2′-bis(diphenylphosphinamino)-1,1′-binaphthyl; the rhodium-catalyzed asymmetric hydrogenation of α-acylaminoacrylic acids and esters gave the corresponding amino acids of up to 95% optical purity.
GAS CHROMATOGRAPHIC DETERMINATION OF NITRITE ION IN WATER USING THE SANDMEYER REACTION
Authors: Chikamoto Takeji , Nagata Shogo
Published: July 2006

An improved gas chromatographic method is presented for the determination of trace amount of nitrite ion (NO2−) in water. The method is based on the Sandmeyer reaction, i.e., the diazotization of p-bromoaniline by NO2− followed by reaction with CuCl in hydrochloric acid to form p-bromochlorobenzene. The derivative is determined by gas chromatography, employing an electron capture detector. The detection limit for NO2− is 0.5 ng/ml (ppb).
PHOTOINDUCED TWO-ELECTRON REDUCTION OF METHYL VIOLOGEN DIMER BY 2-PROPANOL THROUGH INTRAMOLECULAR PROCESS AND FORMATION OF VIOLOGEN RADICAL CATION DIMER
Authors: Furue Masaoki , Nozakura Shun-ichi
Published: July 2006

In the photoreduction of the newly synthesized methyl viologen dimer,1′,1″-trimethylene-bis(1-methyl-4,4′-bipyridinium) perchlorate, by 2-propanol, the exclusive formation of the stable radical cation dimer at room temperature was observed, which gave an unequivocal evidence for the intramolecular process.
FREE RADICAL CHAIN ELIMINATION REACTION (ERC1). CONVERSION OF VICINAL DINITRO COMPOUNDS OR β-NITRO SULFONES TO OLEFINS WITH TRIBUTYLTIN HYDRIDE
Authors: Ono Noboru , Miyake Hideyoshi , Tamura Rui , Hamamoto Isami , Kaji Aritsune
Published: July 2006

Vicinal dinitro compounds (1) or β-nitro sulfones (2) are converted to olefins in good yields on treatment with tributyltin hydride. This elimination proceeds by way of an electron transfer chain mechanism. The elimination from 1 is nonstereospecific and the elimination from 2 is stereospecific.
PRODUCTION OF HYDROGEN AND HYDROCARBON FROM CELLULOSE AND WATER
Authors: Kawai Maki , Kawai Tomoji , Tamaru Kenzi
Published: July 2006

H2, CH4 and CO are produced by the thermal reaction (300°C) of cellulose and water vapor using Pt, Pt–TiO2 and Ru/SiO2 as catalysts, among which the Ru/SiO2 catalyst showed the highest activity for direct production of CH4, and H2.
ISOLATION AND STRUCTURE OF A 330 NM UV-ABSORBING SUBSTANCE, ASTERINA-330 FROM THE STARFISH ASTERINA PECTINIFERA
Authors: Nakamura Hideshi , Kobayashi Jun-ichi , Hirata Yoshimasa
Published: July 2006

A new mycosporine-like amino acid with a characteristic UV-absorption maximum at 330 nm has been isolated from the starfish Asterina pectinifera, and its structure was determined to be 5.
EFFICIENT CONVERSION OF CARBOXYLIC ACIDS INTO THIOL ESTERS
Authors: Kunieda Takehisa , Abe Yoshihiro , Hirobe Masaaki
Published: July 2006

A facile and direct preparation of thiol esters from carboxylic acids and thiols using diphenyl 2-oxo-3-oxazolinylphosphonate in the presence of triethylamine is described.
METAL-CATALYZED ORGANIC PHOTOREACTIONS. TITANIUM(IV) CHLORIDE-CATALYZED PHOTOREACTIONS OF ALCOHOLS AND FORMIC ESTERS
Authors: Sato Tadashi , Kaneko Hirokazu , Takahashi Toyohiko
Published: July 2006

The UV-irradiation of some alcohols in the presence of titanium(lV) chloride gave products with a C–C bond formation between alcohol molecules. The titanium(iv) chloride-catalyzed photoreaction of formic esters in alcohols induced the formylation of alcohol at the α-position.
CHEMILUMINESCENCE OF 9-METHYLENEACRIDANS IN MICELLAR AND MEMBRANOUS SYSTEMS
Authors: Shinkai Seiji , Ishikawa Yu-ichi , Manabe Osamu , Kunitake Toyoki
Published: July 2006

Chemiluminescence of a 1,2-dioxetane derived from 9-methylene-10-dodecylacridan was not detected in aqueous solution but was detected in micellar and membranous systems. The quantum yield and the rate of the chemiluminescence decay in the membranous (2C1615G and 2C1630G) system were affected by the chain melting transition. The results indicate that the chemiluminescence is sensitively affected by the microenvironmental effect.
THE REACTIONS OF BENZYLATED PYRROLE AND ADENINE RIBONUCLEOSIDES WITH GRIGNARD REAGENTS
Authors: Kawana Masajiro
Published: July 2006

The anomerization of benzylated pyrrole nucleosides were found to proceed by the use of t-BuMgBr. These nucleosides also reacted with MeMgI to produce open-chain products. On the other hand, the reaction of a perbenzylated adenosine with the Grignard reagent gave rise to regioselective 2′-O-debenzylation.
CRYSTALLIZATION OF ZEOLITE ZSM-5 FROM SINGLE CATION SYSTEM
Authors: Nakamoto Hiromi , Takahashi Hiroshi
Published: July 2006

Crystallization rates of ZSM-5 from the reaction mixture of TPA single cation system was measured in relation with the composition of the reactants. The crystallization rate strongly depended on concentration ratios of the components such as (TPA)2O/SiO2, SiO2/Al2O3 and H2O/SiO2 i.e., it increased along with increasing (TPA)2O/SiO2 and SiO2/Al2O3 and decreased with increasing H2O/SiO2. Na cation did not seem to play a major role in the crystallization from the Na-TPA cation system with SiO2/Al2O3 ratio above ca. 100.
TPD AND XPS STUDY ON THERMAL BEHAVIOR OF ABSORBED OXYGEN IN La1−xSrxCoO3
Authors: Yamazoe Noboru , Teraoka Yasutake , Seiyama Tetsuro
Published: July 2006

Two types of oxygen desorption from La1−xSrxCoO3 were revealed by the appearance of a broad desorption peak(α) below ca. 800°C and a sharp one(β) around 820°C. The binding energy of O ls level for absorbed oxygen was clearly different from that for lattice oxygen. Close examination shows that α is ascribable to the desorption of the absorbed oxygen while β may be the desorption of a part of lattice oxygen.
THE STRUCTURE OF SAFFLOMIN-A, A COMPONENT OF SAFFLOWER YELLOW
Authors: Onodera Jun-ichi , Obara Heitaro , Osone Masahide , Maruyama Yasunobu , Sato Shingo
Published: July 2006

The structure of safflomin-A, a yellow component of the flowers of Safflower (Carthamus tinctorius L.), was investigated.
A NOVEL METHOD FOR THE SYNTHESIS OF β-LACTAMS BY MEANS OF PHASE TRANSFER SYSTEM
Authors: Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

The reaction of β-amino acids with methanesulfonyl chloride in a chloroform-water bilayer system in the presence of 15 mol% of tetrabutylammonium hydrogen sulfate gives the corresponding β-lactams in good yields.
OLEFIN SYNTHESIS BY REACTION OF ALKYL PHENYL TELLURIDES WITH CHLORAMINE-T
Authors: Otsubo Tetsuo , Ogura Fumio , Yamaguchi Hachiro , Higuchi Hiroyuki , Sakata Yoshiteru , Misumi Soichi
Published: July 2006

Alkyl phenyl tellurides reacted with chloramine-T in refluxing tetrahydrofuran to give olefins in high yields.
SYNTHETIC STUDIES TOWARD MAYTANSINOIDS PREPARATION OF THE OPTICALLY ACTIVE INTERMEDIATES FROM d-MANNOSE
Authors: Isobe Minoru , Ichikawa Yoshiyasu , Kitamura Masato , Goto Toshio
Published: July 2006

Optically active intermediates (15 and 23) for maytansine were synthesized from d-mannose via heteroconjugate addition of methyllithium as a crucial step.
TOTAL SYNTHESIS OF IONONES AND IRONES FROM 2-HYDROXYMEWL-4-PHENYLTHIO-1-BUTENE
Authors: Mandai Tadakatsu , Nishikawa Kengo , Yamaguchi Hirofumi , Kawada Mikio , Otera Junzo
Published: July 2006

A sequence of allylation, the Wacker reaction, and desulfonylation of homoallyl sulfones provided a new synthetic method for the α,β,γ,δ-unsaturated ketone system often encountered in natural products. This procedure was successfully applied to ionone and irone synthesis.
INTRAMOLECULAR Cα- AND Cγ-ALKYLATIONS OF TERTIARY ENAMINONES. FACILE ROUTES TO FUNCTIONALIZED INDOLE RING SYSTEMS
Authors: Iida Hideo , Yuasa Yoshifumi , Kibayashi Chihiro
Published: July 2006

Under the suitably controlled conditions, the tertiary enaminones undergo intramolecular ring formation at Cα and Cγ to give 1-(2-bromo-4,5-methylenedioxybenzyl) tetra (or hexa)hydro-4(or 6)-oxoindoles which can serve as potential precursors to lycoranes.
A ONE-POT AND SELECTIVE PREPARATION OF ALKYLATED 3-CYCLOHEXEN-1-ONE
Authors: Takabe Kunihiko , Ohkawa Suguru , Katagiri Takao
Published: July 2006

Treatment of lithiated nitrile with conjugated 1,3-dienes, such as isoprene, myrcene, and butadiene, followed by hydrolysis with 3N–HC1 gave selectively alkylated 3-cyclohexen-1-ones.
HYDROGEN PRESSURE DEPENDENCE OF THE ASYMMETRIC HYDROGENATION OF METHYL ACETOACETATE WITH MODIFIED NICKEL/SiO2 CATALYST
Authors: Nitta Yuriko , Sekine Fumimaro , Sasaki Jun , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

The optical yield of methyl 3-hydroxybutyrate in the asymmetric hydrogenation of methyl acetoacetate with tartaric acid-modified Ni/SiO2 catalyst decreased linearly with an increase in the hydrogen pressure up to 10 kg/cm2 in contrast to the data under higher hydrogen pressures.
CATALYTIC REACTIVITY OF THE LATTICE OXIDE IONS OF PRASEODYMIUM OXIDE
Authors: Takasu Yoshio , Matsui Masaki , Matsuda Yoshiharu
Published: July 2006

Lattice oxide ions of praseodymium oxide, Pr6O11, have been revealed to play an important role in the oxidation of carbon monoxide using 18O2 tracer and a TPD(temperature-programmed-desorption) techniques.
THE SENSITIZATION EFFECT IN THE LASER INDUCED INFRARED FLUORESCENCE SPECTROSCOPY BY ADDITION OF A SECOND COMPONENT
Authors: Higuchi Seiichiro , Kihara Noriaki , Waki Hiroshi , Tanaka Shigeyuki
Published: July 2006

The laser induced infrared fluorescence spectra of gaseous samples were measured, adding propylene as a second component. It was shown that the marked intensity enhancement was realized for the bands of the objective components in such mixed samples. This effect seemed to become larger with smaller concentrations of the components.
THE CRYSTAL STRUCTURE OF trans-2,4,9-TRIMETHYLTHIOXANTHENE N- (p-TOLUENESULFONYL)SULFILIMINE
Authors: Tamura Yasumitsu , Mukai Chisato , Ikeda Masazumi , Kido Masaru
Published: July 2006

X-Ray crystal structure analysis of the title compound is reported.
A CONVENIENT SYNTHESIS OF α-HYDROXYALLENES BY THE REACTION OF PROPARGYL IODIDES WITH ALDEHYDES IN THE PRESENCE OF STANNOUS HALIDE
Authors: Mukaiyama Teruaki , Harada Taira
Published: July 2006

In the presence of stannous halide, propargyl iodides react with aldehydes in an aprotic solvent to yield α-hydroxyallenes as major products, particularly in the cases of γ-substituted propargyl iodides, along with β-hydroxyacetylenes.
ROLE OF AgClO4 IN ACTIVATING SIGMA-ARYLNICKEL HALIDE COMPLEX FOR ETHYLENE DIMERIZATION
Authors: Ishimura Yoshimasa , Maruya Ken-ichi , Nakamura Yoshiyuki , Mizoroki Tsutomu , Ozaki Atsumu
Published: July 2006

C6F5Ni (PPh3)2Br gives a maximum activity for ethylene dimerization when mole ratio of added AgClO4 to the complex reaches two. 31P-NMR study of the reaction between AgClO4 and the complex reveals that the variation in dimerization activity runs parallel with concentration of C6F5Ni (PPh3) ClO4 formed by the reaction with AgClO4, thus disclosing a catalytically active species.
PHOTOREGULATED BINDING OF AMPHIPATHIC PROTEINS TO AZOAROMATIC POLYMER
Authors: Negishi Naoki , Ishihara Kazuhiko , Shinohara Isao , Okano Teruo , Kataoka Kazunori , Sakurai Yasuhisa , Akaike Toshihiro
Published: July 2006

Photoresponsive polymeric adsorbents were prepared by coating of insoluble support with polymeric azo dyes. Adsorption behaviors of amphipathic proteins to the adsorbent were studied. The adsorption behavior suggests that the hydrophobicity of these protein surface is different from each other.
STEREOSPECIFIC ALKYLATION OF THE OXIDIZED DIKETOPIPERAZINE DERIVATIVE, 3,6-DIMETHOXY-l,4-DIMETHYL-2,5-PIPERAZINEDIONE
Authors: Nakatsuka Shin-ichi , Sasaki Kenji , Yamaguchi Ken-ichiro , Goto Toshio
Published: July 2006

Kinetic monoalkylation of 3,6-dimethoxy-l,4-dimethyl-2,5-piperazinedione 2a via its anion gave a single stereoisomer (3) in which two methoxy groups are in the same side. Acid catalyzed equilibrium of 3 gave a mixture of 3 and its stereoisomer 4 in about 1:1 ratio. Acylation also gave a monoacylated product.
A CONVENIENT STEREOSPECIFIC SYNTHESIS OF α,β-UNSATURATED CARBOXYLIC ESTERS VIA THE PALLADIUM-CATALYZED CARBONYLATION OF 1-ALKENYLBORANES
Authors: Miyaura Norio , Suzuki Akira
Published: July 2006

1-Alkenyiboranes readily prepared by the hydroboration of alkynes react smoothly with carbon monoxide in the presence of palladium chloride and sodium acetate in methanol to give the corresponding α,β-unsaturated carboxylic esters with retention of configuration with respect to alkenylboranes in good yields.
IMMOBILIZATION OF STRONTIUM FROM AN AQUEOUS SOLUTION USING THE CRYSTALLINE HYDROUS TITANIUM DIOXIDE FIBERS
Authors: Sasaki Takayoshi , Komatsu Yu , Fujiki Yoshinori
Published: July 2006

Immobilization of strontium from an aqueous solution was studied by using the two kinds of crystalline hydrous titanium dioxide fibers(C-TiHO). Strontium ions were adsorbed on the C-TiHO from an alkaline solution and its final composition was SrTixO2x+1·nH2O(x=4–6). The Sr-adsorbed C-TiHO was decomposed into the mixture phase of strontium titanate (SrTiO3) and rutile (TiO2) by calcining at 1000 °C. The sintered mixture phase was proved to be suitable as an immobilizer of strontium from the results of leaching tests under atmospheric and hydrothermal conditions.
SYNTHESIS OF 2-NITROALKYL PHENYL SELENIDES AND THEIR CONVERSION TO NITROALKENES
Authors: Hayama Takashi , Tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

Treatment of alkenes with benzeneselenenyl bromide followed by addition of silver nitrite provided a mixture of 2-nitroalkyl and 2-hydroxyalkyl phenyl selenides. Oxidation of the former selenides with hydrogen peroxide gave nitroalkenes in 90–93% yields.
ALBAFURAN C, A NATURAL DIELS–ALDER ADDUCT OF A DEHYDROPRENYL-2-PHENYLBENZOFURAN WITH A CHALCONE FROM MULBERRY
Authors: Takasugi Mitsuo , Ishikawa Shin-ichi , Nagao Shigemitsu , Masamune Tadashi
Published: July 2006

The structure elucidation of a minor antifungal compound, isolated from “intact” epidermis of mulberry shoots and named albafuran C, is described.
GORGOST-5-ENE-3β,7α,11α,12β-TETRAOL 12-MONOACETATE, A NEW MARINE STEROL FROM THE GORGONIAN ISIS HIPPURIS
Authors: Tanaka Jun-ichi , Higa Tatsuo , Tachibana Kazuo , Iwashita Takashi
Published: July 2006

The title compound (1) has been isolated from the gorgonian Isis hippuris, and its structure was elucidated by spectral analysis. It is one of the most highly oxygenated marine sterols retaining the C5–C6 unsaturation.
DIRECT HYDROXYLATION OF AROMATIC COMPOUNDS IN AN RF PLASMA
Authors: Tezuka Meguru , Yajima Tatsuhiko , Tsuchiya Atsuhiko
Published: July 2006

The hydroxylation of aromatic compounds was carried out in the plasma generated by a radiofrequency discharge. Benzene and naphthalene yielded phenol and naphthols, respectively, as single volatile products. With respect to alkylbenzenes, the oxidation of the side-chains competed with the aromatic hydroxylation.
ACETYLATION BY KETENE OF ALCOHOLS SUPPORTED ON SOLID ADSORBENTS
Authors: Chihara Teiji , Takagi Yuzuru , Teratani Shousuke , Ogawa Haruo
Published: July 2006

Primary, secondary, and tertiary alcohols supported on solid adsorbents such as alumina, silica gel, celite, magnesium oxide, zinc oxide, titanium oxide, and charcoal were acetylated by ketene in good yields.
PALLADIUM(II)-CATALYZED CHLOROALLYLATION OF ALKYNYLSILANES. REGIO- AND STEREOSELECTIVE SYNTHESIS OF β-CHLOROALKENYLSILANES
Authors: Yamaguchl Ryohei , Kawasaki Hiroshi , Yoshitome Toshihide , Kawanisi Mituyosi
Published: July 2006

Reactions of alkynyltrimethylsilanes with allylic chlorides in the presence of a catalytic amount of PdCl2(PhCN)2 give regio-and stereoselectively 4-trimethylsilyl-5-chloro-1,4(E)-dienes in good yields.
TOTAL SYNTHESIS OF BASTADIN-6, A BROMINATED TYROSINE-DERIVED METABOLITE FROM THE SPONGE IANTHELLA BASTA
Authors: Nishiyama Shigeru , Suzuki Tomoko , Yamamura Shosuke
Published: July 2006

Bastadin-6, a 28-membered ring lactam, was synthesized from the known bis-p-methoxybenzyl bastadin-2 in 6 steps.
LACTONIZATION OF γ-HALO ESTERS WITH SILICA GEL CATALYST
Authors: Tsuboi Sadao , Fujita Hiroshi , Muranaka Koichi , Seko Katsuhiko , Takeda Akira
Published: July 2006

A facile synthesis of γ-butyrolactones by the lactonization of γ-halo esters with silica gel catalyst and its application to the stereoselective synthesis of (±)-canadensolide are described.
THE SYNTHESIS OF 5H-CYCLOHEPT[a]AZULEN-5-ONE AND ITS NOVEL REACTION WITH A SULFUR YLIDE: THE FORMATION OF A NEW HETEROCYCLIC SYSTEM
Authors: Yasunami Masafumi , Takagi Atsushi , Takase Kahei
Published: July 2006

5H-Cyclohept[a]azulen-5-one and its 11-methoxycarbonyl derivative were synthesized. The latter reacted in a novel manner with a sulfur ylide to give a new heterocyclic compound having 5-oxa-5H-dicyclohepta[cd,hi] indene skeleton.
PHOTOREACTIONS OF 8-METHYLENE- AND 8-DICYAN0METHYLENE-TRICYCL0[3.2.2.02,4]NON-6-ENE
Authors: Kumagai Tsutomu , Ichikawa Motomu , Mukai Toshio
Published: July 2006

8-Methylenetricyclo[3.2.2.02,4]non-6-ene (4) gave 8-methylenetetracyclo[4.3.0.02,4.05,7]nonane (6) on photolysis, whereas the dicyano-derivative (5) afforded two different-types of products, 8-dicyanomethylenetricyclo[3.3.1.02,4]non-6-ene (9) and 9,9-dicycano-8-methylenetricyclo[3.2.2.02,4]non-6-ene (10).
THE ISOLATION OF TWO SIMPLE γ-LACTONIC CEMBRANOLIDES FROM THE SOFT CORAL SINULARIA MAYI
Authors: Uchio Yasuto , Eguchi Shizuko , Nakayama Mitsuru , Hase Tsunao
Published: July 2006

Two simple γ-lactonic cembranolides were isolated from the soft coral Sinularia mayi Lüttschw. and structurally elucidated on the basis of spectral and chemical evidence.
SYNTHESIS OF Dl-VALIDOXYLAMINE B
Authors: Ogawa Seiichiro , Toyokuni Tatsushi , Iwasawa Yoshikazu , Abe Yasuo , Suami Tetsuo
Published: July 2006

Dl-Validoxylamine B was first synthesized by the reaction of Dl-4,7:5,6-Dl-O-isopropylidene-(1,4,6/5)-4,5,6-trihydroxy-3-hydroxymethyl-2-cyclohexenylamine with Dl-3,4-di-O-acetyl-1,2-anhydro-5,7-O-benzylidene-(1,2,4,6/3,5)-6-hydroxymethyl-1,2,3,4,5-cyclohexanepentol, followed by removal of the protecting groups.
A CONVENIENT SYNTHESIS OF BENZYLMETHYLCHLOROSILANES BY THE PALLADIUM-CATALYZED DECHLORINATIVE SILYLATION OF BENZYLIC CHLORIDES WITH METHYLCHLORODISILANES
Authors: Matsumoto Hideyuki , Kasahara Miyuki , Matsubara Ikuya , Takahashi Masatoshi , Nakano Taichi , Nagai Yoichiro
Published: July 2006

Benzylmethylchlorosilanes were prepared in high yields by the dechlorinative silylation of benzylic chlorides with methylchlorodisilanes MenSi2Cl6−n (n = 2,3, and 4) in the presence of a catalytic amount of Pd(PPh3)4.
CATALYTIC ACTIVITY OF BINUCLEAR MANGANESE(III) COMPLEXES FOR THE DECOMPOSITION OF HYDROGENPEROXIDE
Authors: Oishi Naoyasu , Nishida Yuzo , Kida Sigeo
Published: July 2006

Some alkoxo-bridged binuclear manganese(III) complexes showed high catalytic activity for the decomposition of hydrogenperoxide compared with mononuclear manganese(III) complexes.
HIGH-TEMPERATURE EVACUATED HYDROXYAPATITE AS A BASE CATALYST FOR THE ISOMERIZATION OF 1-BUTENE
Authors: Imizu Yuzo , Kadoya Masahiro , Abe Hiromichi , Itoh Hidenobu , Tada Akio
Published: July 2006

Hydroxyapatite calcined in air did not show any catalytic activity for the isomerization of 1-butene even at 573 K, but hydroxyapatite evacuated above 773 K catalyzed the isomerization at 273 K selectively to form cis-2-butene by an intramolecular hydrogen rearrangement.
SYNTHESES AND HOMOPOLYMERIZATION OF 7,8-DIALKOXYCARBONYL-7,8-DICYANOQUINODIMETHANES
Authors: Iwatsuki Shouji , Itoh Takahito , Nishihara Katsumi , Furuhashi Hidehiko
Published: July 2006

7,8-Dimethoxycarbonyl-7,8-dicyanoquinodimethane and 7,8-diethoxycarbonyl-7,8-dicyanoquinodimethane were prepared successfully as novel compounds. These two compounds homopolymerized readily under thermal, radical, and anionic conditions except for cationic one. Moreover, weak bases such as triethylamine, pyridine, and pyrrolidine were found to induce the homopolymerization.
ON THE STRUCTURE OF AILANTHONE, A BITTER PRINCIPLE FROM AILANTHUS ALTISSIMA
Authors: Naora Hirokazu , Furuno Tetsuo , Ishibashi Masami , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi , Polonsky Judith
Published: July 2006

The structure of ailanthone has been revised and shown to be 11β,20-expoxy-1β, 11α, 12α-trihydroxypicrasa-3,13(21-diene-2,16-dione by X-ray diffraction analysis.
METAL-NITROXYL SPIN EXCHANGE INTERACTION OBSERVED FOR THE IMINOXYL LABELED Co(II)-TETRAPHENYLPORPHYRIN
Authors: Ogiyama Shinji , Okada Keizo , Tajima Kunihiko , Sasaki Hidetoshi , Mukai Kazuo , Ishizu Kazuhiko
Published: July 2006

A typical AB type featured to spin–spin exchange interaction was observed for the ESR of the iminoxyl adduct of the low spin tetraphenylporphyrin-Co(II) complex. A scalar spin–spin exchange interaction (J) between the nitroxide and the metal site was successfully extimated from the line separation in the observed AB type doublet splitting.
PHOTO-INDUCED OXIDATIVE ADDITION OF BUTYL IODIDE TO A DIMERIC RHODIUM(I) COMPLEX. AN ELECTRON TRANSFER CHAIN MECHANISM
Authors: Fukuzumi Shunichi , Nishizawa Nobuaki , Tanaka Toshio
Published: July 2006

Irradiation of an acetonitrile solution of [Rh2(dicp)4]2+ (dicp = 1,3-diisocyanopropane) in the presence of butyl iodide by the visible light at 553 nm produces the adduct, [Rh2(dicp)4(n-Bu) (I)]2+, in a high quantum yield, e.g., Φ = 25.2. A photo-induced electron transfer chain mechanism is presented based on the effects of electron acceptors (p-dinitrobenzene, p-benzoquinone, and chloranil) and radical scavengers (oxygen and isopentyl nitrite) on the photochemical reaction.
CHIRALITY CONTROL BY KINETIC PROTONATION: ENANTIOSELECTIVE SYNTHESES OF (+)-VELBANAMINE, (−)-ISOVELBANAMINE, AND (+)-CLEAVAMINE
Authors: Takano Seiichi , Uchida Wataru , Hatakeyama Susumi , Ogasawara Kunio
Published: July 2006

Optimal conditions for inversion of the chirality at 2-position of the 2-alkyllactone(5) have been established. By utitizing the inversion method developed, three indole alkaloids, (+)-velbanamine(16), (−)-isovelbanamine(17), and (+)-cleavamine(18), have been synthesized from the chiral lactone(1) which has been previously used for the syntheses of the enantiomers of these alkaloids.
REGENERATION OF VITAMIN E FROM α-CHROMANOXYL RADICAL BY GLUTATHIONE AND VITAMIN C
Authors: Niki Etsuo , Tsuchiya Jyunichi , Tanimura Ritsuko , Kamiya Yoshio
Published: July 2006

α-Chromanoxyl radical formed by the interaction of α-tocopherol (vitamin E) with alkoxyl radical or DPPH was found by electron spin resonance spectroscopy to react with glutathione and vitamin C to regenerate α-tocopherol.
PREPARATION OF SEVERAL NEW TRANSITION METAL HYDRIDO COMPLEXES OF A TYPE MH(Y)Ln (M = Ni, Pd, Pt; Y = IMIDO, ALKENYL CARBOXYLATO) AND ELIMINATION OF HY FROM THE COMPLEXES ON INTERACTION WITH π-ACIDS
Authors: Yamamoto Takakazu , Sano Kenji , Yamamoto Akio
Published: July 2006

MH(succinimido) (PCy3)2 (M = Ni, Pd) and trans-PtH(OCOR) (PCy3)2(R = –C(CH3)=CH2, –CH2CH=CH2) have been prepared by oxidative addition of succinimide or the corresponding acid to the zero-valent transition metal complexes. Treatment of the hydrido complexes with π-acids such as CO and maleic anhydride causes elimination of succinimide or RCOOH.
RAPID ELECTRONIC RELAXATION PHENOMENON IN THE TRANSITION BETWEEN 6A1 AND 2T2 STATES
Authors: Maeda Yonezo , Ohshio Hiroki , Takashima Yoshimasa
Published: July 2006

N,N′-Bis(1-methyl-3-oxobutylidene)ethylenediaminato-1,3-di-4-pyridylpropaneiron(III) tetraphenylborate was synthesized and the temperature dependences of the Mössbauer spectrum and magnetic susceptibility for the compound were measured. The fact that the electronic relaxation between 6A1 and 2T2 states is faster than the lifetime (0.86×10−7 s) of the nuclear excited state of an 57Fe Mössbauer atom was confirmed by means of Mössbauer spectroscopy.
5,6-DIHYDROPHENANTHRIDIN-5-YL AS AN ACTIVATABLE PROTECTING GROUP OF CARBOXYLIC ACID—A DIRECT PREPARATION OF AMIDES FROM 5-ACYL-5,6-DIHYDROPHENANTHRIDINE
Authors: Narasaka Koichi , Hirose Takuji , Uchimaru Tadafumi , Mukaiyama Teruaki
Published: July 2006

Various amides are directly prepared from the protected carboxylic acids, 5-acyl-5,6-dihydrophenanthridines, by the reaction with primary amines in the presence of cerie pyridinium chloride and cupric oxide.
CHEMICAL PROPERTIES OF PROTEINACEUS CELL WALL FROM AN ACIDO-THERMOPHILE, Sulfolobus acidocaldarius
Authors: Inatomi Ken-ichi , Ohba Masayuki , Oshima Tairo
Published: July 2006

Proteinaceus cell wall from an acido-thermophilic archaebacteria, Sulfolobus acidocaldarius, contains two glycoproteins of molecular weight 40 000 and 100 000 as major subunits. Glucose and mannose were major carbohydrate components. The cell wall proteins were rich in hydrophobic amino acid residues. In the electron microscopy, a hexagonal array was seen on the surface of the isolated cell wall as well as the intact cell.
A CONVENIENT SYNTHESIS OF (±)-RETRONECINE
Authors: Niwa Haruki , Kuroda Akio , Yamada Kiyoyuki
Published: July 2006

Retronecine (1), the necine base of physiologically active pyrrolizidine alkaloids was synthesized in racemic form from ethyl 2,3,5,6-tetrahydro-1H-pyrrolizine-7-carboxylate (2) in five steps.
TIME-RESOLVED ABSORPTION SPECTROSCOPIC DETECTION OF 10,10-DIMETHYL-10-SILAANTHRACEN-9(10H)-ONE OXIDE
Authors: Sugawara Tadashi , Iwamura Hiizu , Hayashi Hisaharu , Sekiguchi Akira , Ando Wataru , Liu Michael T H
Published: July 2006

Laser-photolysis studies have been carried out on a solution of 9-diazo-10,10-dimethyl-10-sila-9(10H)-anthracene in cyclohexane. In aerated solutions, the triplet 10,10-dimethyl-10-silaanthracen-9(10H)-ylidene was quenched with oxygen (kq=2×109 M−1s−1) to give a characteristic absorption (λmax at 425 nm) due to the corresponding carbonyl oxide.
PHOTOINDUCED ION PERMEATION THROUGH TERNARY COMPOSITE MEMBRANE COMPOSED OF POLYMER/LIQUID CRYSTAL/AZOBENZENE-BRIDGED CROWN ETHER
Authors: Kumano Atsushi , Niwa Osamu , Kajiyama Tisato , Takayanagi Motowo , Kano Koji , Shinkai Seiji
Published: July 2006

Azobenzene-bridged crown ether(AZO-CR) in the ternary composite membrane exhibits trans–cis photoisomerization by irradiation of ultraviolet and visible lights. The K+ ion permeation through the ternary composite membrane is facilitated by photoirradiation. The facilitated transport of K+ ion is in strong relation to an altered affinity of AZO-CR for K+ ion due to the trans–cis configurational change of AZO-CR induced by photoirradiation. The cation permeation is remarkably influenced by the magnitude of solubility of counter-anion to the composite membrane.
PHOTOCHEMICAL REACTIONS OF N-THIOAROYLUREAS AND N-THIOAROYLTHIOUREAS
Authors: Aoyama Hiromu , Sakamoto Masami , Omote Yoshimori
Published: July 2006

Irradiation of N-thioaroylureas and N-thioaroylthioureas gave imidazolidinones and imidazolidinethiones, respectively both via intramolecular hydrogen abstraction by the thioaroyl groups; the photoproducts were easily converted to the imidazolones and imidazolthiones on treatment with trifluoroacetic acid.
STRUCTURE OF A NEW CYANOGLUCOSIDE FROM ILEX WARBURGII LOESN.
Authors: Ueda Katsuhiro , Yasutomi Kazuko , Mori Iwao
Published: July 2006

A cyanoglucoside (1) has been isolated from the fruits of Ilex warburgii Loesn., and its structure has been elucidated by chemical and spectral means as (Z)-6α-(β-d-glucosyloxy)-4α, 5α-dihydroxy-2-cyclohexene-Δ1,α-acetonitrile. A related compound, Menisdaurin (3) was also isolated.
8,11-EPOXY BRIDGED CEMBRANOLIDE DITERPENE FROM THE SOFT CORAL SINULARIA FLEXIBILIS
Authors: Mori Kenichiro , Suzuki Sukeji , Iguchi Kazuo , Yamada Yasuji
Published: July 2006

Two new cembranolide diterpenes have been isolated from the Japanese soft coral Sinularia flexibilis. Their structures have been elucidated on the basis of spectroscopic data and chemical transformations.
THE CONGRUENT MELTING COMPOUNDS IN THE SYSTEM KCl–SnCl2
Authors: Ichiba Sumio , Iwata Yoshihiro
Published: July 2006

The thermal behavior of the powder mixtures of KCl and SnCl2 with various molar ratios was studied by thermal analysis. The reaction between KCl and SnCl2 to form the congruent melting compounds, KSnCl3 and KSn3Cl7, occurred at 190 °C and 212 °C, respectively. The existence of these compounds in the system KCl–SnCl2 was indicated in the equilibrium diagram constructed from the data of the DTA heating-curves in agreement with the previous work.
THE REACTION OF LITHIUM TRIALKYL(1-ALKYNYL)BORATES WITH ORTHOESTERS IN THE PRESENCE OF TITANIUM TETRACHLORIDE. A NEW SYNTHESIS OF α,β-UNSATURATED CARBONYL COMPOUNDS
Authors: Hara Shoji , Dojo Hidetaka , Suzuki Akira
Published: July 2006

Trialkyl(1-alkynyl)borates readily available from trialkylboranes and lithium acetylides react with orthoesters in the presence of titanium tetrachloride, followed by the oxidation with hydrogen peroxide and sodium hydroxide to give the corresponding α,β-unsaturated carbonyl compounds.
PHOTOCHEMICAL ACTIVATION OF METAL–CARBON BOND IN ZINC AND ALUMINIUM PORPHYRINS. SUBSTITUTION REACTION WITH HINDERED PHENOLS
Authors: Murayama Hideki , Inoue Shohei , Ohkatsu Yasukazu
Published: July 2006

Substitution reactions of N-methyltetraphenylporphinatozinc ethyl and tetraphenylporphinatoaluminium ethyl with hindered phenols such as 2,6-di-t-butyl-4-methylphenol and 2,6-di-t-butyl-4-methoxyphenol are accelerated dramatically by the irradiation with visible light, to form the metalloporphyrins with the corresponding phenoxy group bound to zinc and aluminium.
AMINE ASSISTED PHOTODECHLORINATION OF 4-CHLOROBIPHENYL. A COMMENT ON THE MECHANISM
Authors: Ohashi Mamoru , Tsujimoto Kazuo
Published: July 2006

The Stern–Volmer plot of the aliphatic amine assisted photodechlorination of 4-chlorobiphenyl was analyzed on the basis of the generalized Stern–Volmer expression for bimolecular photochemical reactions which can occur from both the excited singlet and triplet states of a reactant. This kinetic treatment showed that the reaction from the singlet state is more efficient than that from the triplet.
EXCIPLEX QUENCHING BY QUATERNARY AMMONIUM SALTS IN CHLOROFORM
Authors: Kitamura Noboru , Imabayashi Shin-ichiro , Tazuke Shigeo
Published: July 2006

Exciplex emission from pyrene-N,N-dimethylaniline and pyrene-1,4-dicyanobenzene was quenched by various quaternary ammonium salts in chloroform. The quenching rate constants depended on the structure of the quaternary ammonium salts. Electrostatic interaction between the dipolar exciplex state and the quaternary ammonium salt may be responsible for the present exciplex quenching.
LAUREACETAL-D AND -E, TWO NEW SECOCHAMIGRANE DERIVATIVES FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Suzuki Teruaki , Suzuki Minoru , Kurosawa Etsuro , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

The structures of laureacetal-D and -E, new halogenated metabolites of the red alga Laurencia nipponica Yamada, were determined by the spectral properties, chemical reactions, and X-ray crystallographic analysis.
SYNTHESIS OF A NEW PHOTO-STABLE SPIROPYRAN
Authors: Karube Isao , Yamazaki Motoo , Matsuoka Hideaki , Suzuki Shuichi
Published: July 2006

3′, 3′-Dimethyl-6-nitrospiro(2H-1-benzopyran-2,2′-indoline) -1′-propionic acid [I] was modified with a methoxy group at 8th position of the pyran ring. The stability of photoresponsive activity was 3.4 times higher than that of [I]. The new spiropyran is promising for the photocontrol of enzyme activity.
SENSITIZED PHOTOOXIDATION REACTIONS OF cis-α,α’-DIMETHYLSTILBENE. SENSITIZER, TEMPERATURE, AND SOLVENT EFFECTS ON PRODUCT DISTRIBUTION.
Authors: Futamura Shigeru , Ohta Hiroyuki , Kamiya Yoshio
Published: July 2006

Sensitized photooxidation of cis-α,α’-dimethylstilbene(1) depends on sensitizer, solvent, and temperature. At room temperature, Ru(bpy)32+- or TPP- sensitized photooxidation reaction of 1 affords a dioxetane hydroperoxide(2), while only an allylic hydroperoxide(3) is obtained when RB or MB is used as sensitizer. At low temperature, 2 comes to be formed independent of the sensitizer used.
Crystal Structure of α-(BEDT-TTF)2PF6
Authors: Kobayashi Hayao , Kato Reizo , Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Saito Gunzi , Inokuchi Hiroo
Published: July 2006

The crystal of α-(BEDT-TTF)2PF6 belongs to triclinic system (BEDT-TTF: bis(ethylenedithiolo)-tetrathiafulvalene). The close intermolecular contacts along the c axis suggests the strong tendency for the side-by-side arrangement of BEDT-TTF molecules. The electrical resistivity measurements show that α-(BEDT-TTF)2PF6 is a semiconductor with a small band gap of about 0.1 eV.
A CONVENIENT SYNTHETIC METHOD OF 1,3-DISUBSTITUTED ISOQUINOLINES USING SILVER TRIFLUOROMETHANESULFONATE AS A KEY REAGENT
Authors: Sato Tadashi , Tamura Kunio , Nagayoshi Kazuo
Published: July 2006

1,3-Disubstituted isoquinolines were prepared under mild conditions from allylbenzenes and nitriles using silver trifluoromethanesulfonate and iodine.
A NEW SYNTHETIC METHOD OF UNSYMMETRICAL α-AMINOAZINES BY THE REACTION OF ALDEHYDE ARENESULFONYL HYDRAZONES WITH α-AMINO-α-ARYLACETONITRILES
Authors: Takahashi Kazumasa , Kurita Hideki , Ogura Katsuyuki , Iida Hirotada
Published: July 2006

Treatment of α-amino-α-arylacetonitriles with aldehyde arenesulfonyl hydrazones affords unsymmetrical α-aminoazines in high yields, which formed by replacement of the arenesulfonyl group of the hydrazone by the acetonitrile carbanion. The formation-mechanism of azines is also discussed.
CHROMONES FROM ACYLSALICYLIC ACIDS
Authors: Bestmann Hans Jürgen , Schade Gerold
Published: July 2006

Acylsalicylic acids 1 can be converted by reaction with N-Phenylketeniminylidene triphenylphosphorane 2 into chromones 6 or 7.
SYNTHESIS AND SOME REACTIONS OF DICHLORO(PENTAMETHYLCYCLOPENTADIENYL)RUTHENIUM(III) OLIGOMER
Authors: Oshima Noriaki , Suzuki Hiroharu , Moro-Oka Yoshihiko
Published: July 2006

Paramagnetic ruthenium(III) complex, [(C5Me5)RuCl2]n, is prepared by the reaction of RuCl3·H2O with C5Me5H in refluxing ethanol. Treatment of [Cp*RuCl2]n (Cp* = C5Me5) with cyclic dienes or α,ω-bis(diphenylphosphino)alkanes gives diamagnetic Ru(II) complexes, Cp*RuCl(diene) or Cp*RuCl(dipos), respectively. Cationic diene complex of ruthenium is formed by the reaction of Cp*RuCl(2,5-norbornadiene) with AgBF4.
DI(2,2,2-TRIFLUOROETHYL) PHOSPHONATE, A NEW PHOSPHORYLATING AGENT, ITS APPLICATION IN THE SYNTHESIS OF OLIGODEOXYRIBONUCLEOTIDES BY THE PHOSPHOTRIESTER APPROACH
Authors: Takaku Hiroshi , Tsuchiya Hiromichi , Imai Kazuaki , Gibbs Don E
Published: July 2006

A new phosphorylating agent, di(2,2,2-trifluoroethyl) phosphonate (1) was found to be a useful agent for the phosphorylation of 3′-hydroxyl group of deoxyribonucleosides. When 5′-O-protected deoxyribonucleosides are treated with 1 in the absence of coupling agents and the products subjected to oxidation, the corresponding 3′-phosphodiesters are obtained in good yields. They are key intermediates for the synthesis of oligodeoxyribonucleotides by the phosphotriester approach.
ISOMERISM OF THE HEXAMOLYBDO-PLATINATE(IV) POLYANION. CRYSTAL STRUCTURES OF K3.5[α-H4.5PtMo6O24]·3H2O AND (NH4)4[β-H4PtMo6O24]·1.5H2O
Authors: Lee Uk , Sasaki Yukiyoshi
Published: July 2006

The hexamolybdo-platinate(IV) anion, [PtMo6O24]8− has been found to have two geometrical isomers, one having the Anderson structure and the other having the same framework with the heptamolybdate ion reported by Lindqvist.
FORMATION OF BENZ[cd]INDAZOLE DERIVATIVES BY THE PHOTOLYSES OF DIAZIDONAPHTHALENES IN THE LOW-TEMPERATURE RIGID MATRICES
Authors: Yabe Akira , Honda Koichi , Nakanishi Hiroshi , Someno Kazuo
Published: July 2006

Two derivatives of benz[cd]indazole were formed in rigid matrices by low-temperature photolyses of peri-diazidonaphthalenes: 5,6-diazidoacenaphthene containing more strain energy than 1,8-diazidonaphthalene and 1,8-diazido-3,6-dinitronaphthalene having strong electron-attractive groups. These indazoles were stable to prolonged irradiation in low-temperature matrices.
INTRAMOLECULAR OXIDATIVE COUPLING OF BROMINATED 2,4′-DIHYDROXYDIARYLMETHANES. A BIOGENETIC SYNTHESIS OF THELEPIN AND ITS ANALOGS
Authors: Tsuge Otohiko , Watanabe Haruyuki , Kanemasa Shuji
Published: July 2006

Oxidation of brominated 2,4’-dihydroxydiarylmethanes with aqueous NaOCl under phase-transfer catalysis or NaOCl on Celite afforded new spiro-p-quinol ethers. Thelepin, which was isolated from the marine annelid Thelepus setosus, was first synthesized from thelephenol by these methods.
A FACILE SYNTHESIS OF α-C-RIBOFURANOSIDES FROM 1-O-ACETYL RIBOSE IN THE PRESENCE OF TRITYL PERCHLOLATE
Authors: Mukaiyama Teruaki , Kobayashi Shu , Shoda Shin-ichiro
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, 1-O-acetyl ribose stereoselectively reacts with silylated nucleophiles, such as silyl enol ether, allylsilane, and trimethylsilyl cyanide, to give the corresponding α-C-ribofuranosides in excellent yields.
EFFICIENT INVERSIONS OF SECONDARY ALCOHOLS USING CESIUM ACETATE AND 18-CROWN-6
Authors: Torisawa Yasuhiro , Okabe Hiromitsu , Ikegami Shiro
Published: July 2006

Reaction of alcohol mesylate with cesium acetate and 18-crown-6 in benzene is an effective method for the inversion of cyclopentyl and cyclohexyl alcohols.
A DIRECT SYNTHESIS OF CARBAMATE ESTER PROM CARBON DIOXIDE, AMINE AND ALKYL HALIDE
Authors: Yoshida Yasuhiko , Ishii Shigeru , Yamashita Tadataka
Published: July 2006

Carbon dioxide reacted with diethylamine and alkyl halide derivatives to give the corresponding alkyl N,N-diethylcarhamate esters in fair yields.
AN AGE DETERMINATION OF AN ANCIENT BURIAL MOUND MAN BY APPARENT RACEMIZATION REACTION OF ASPARTIC ACID IN TOOTH DENTIN
Authors: Shimoyama Akira , Harada Kaoru
Published: July 2006

An age of a man from an ancient burial mound dated to the seventh century was estimated to be about 50 years old, using an apparent racemization phenomenon of aspartic acid found from the tooth dentin. For this estimate, the D/L ratios of modern teeth and those by a heating experiment were also examined.
FORMATION OF HELICAL SUPER STRUCTURE FROM SINGLE-WALLED BILAYERS BY AMPHIPHILES WITH OLIGO-l-GLUTAMIC ACID-HEAD GROUP
Authors: Yamada Kimiho , Ihara Hirotaka , Ide Toshio , Fukumoto Takanori , Hirayama Chuichi
Published: July 2006

Double-chain alkyl amphiphiles with oligo-l-glutamic acid-head group were prepared. These compounds were dispersed in water at pH 8 to 9 to form bilayer aggregates, in which helical and hollow structures were contained. New CD bands were observed in the solution.
ON THE STRUCTURES OF PISIFERIN AND ISOPISIFERIN
Authors: Hasegawa Shinichi , Hirose Yoshiyuki , Yatagai Mitsuyoshi , Takahashi Toshio
Published: July 2006

The structure of pisiferin has been revised, and the double bond isomer, named isopisiferin, has been found in the seed of Chamaecyparis pisifera.
ALKOXIDE-ACCELERATED [1,3] SIGMATROPIC SHIFTS OF BICYCLO[3.2.2]NON-6-EN-2-OLS. SUBSTITUENT EFFECTS AND TANDEM [1,3]-[3,3] SIGMATROPIC REARRANGEMENTS
Authors: Uyehara Tadao , Ohmori Kazuhiro , Kabasawa Yasuhiro , Kato Tadahiro
Published: July 2006

Bicyclo[3.2.2]non-6-en-2-ols are shown to undergo [1,3] sigmatropic shifts under the influence of KH and 18-crown-6. A series of the 2-endo-vinyl alcohols were transformed into the ring-expanded ketones, bicyclo[5.2.2]undec-8-en-4-ones, via the tandem [1,3]-[3,3] sigmatropic rearrangements.
ADSORPTION AND ORIENTATION OF TEREPHTHALIC ACID ON ALUMINA OBSERVED BY INELASTIC ELECTRON TUNNELING SPECTROSCOPY
Authors: Kamata Satuo , Higo Morihide
Published: July 2006

Terephthalic acid adsorbed onto Al2O3 from alcohol solution was studied by using inelastic electron tunneling spectroscopy. A comparison with the tunneling spectrum of p-acetylbenzoic acid shows that terephthalic acid is adsorbed predominantly as a monocarboxylate ion onto the alumina surface.
SELECTIVE SYNTHESIS OF DIMETHYL ETHER FROM SYNTHESIS GAS
Authors: Fujimoto Kaoru , Asami Kenji , Shikada Tsutomu , Tominaga Hiro-o
Published: July 2006

Dimethyl ether was produced selectively from synthesis gas with hybrid catalysts composed of methanol synthesis catalysts and γ-alumina. It was estimated that methanol, the primary product, was immediately converted in situ to dimethyl ether and water on the γ-alumina and that the water reacted with CO to form CO2 and H2 on the methanol synthesis catalyst.
REPLACEMENT OF A CARBONYL GROUP OF CYCLIC KETONES BY A SULFUR OR A NITROGEN ATOM. A NEW METHOD FOR TRANSFORMAT OF STEROIDAL KETONES INTO THIA- OR AZASTEROIDS
Authors: Suginome Hiroshi , Yamada Shinji
Published: July 2006

We describe a new and versatile method for transforming cyclic ketones into cyclic sulfides or cyclic amines with the same ring size via five-step procedure. The transformation is stereospecific with regard to the chiral center adjacent to the carbonyl group of the ketones.
EFFECT OF STRUCTURE ON PHOTOALCOHOLYSIS OF AROMATIC α-HALOKETONES
Authors: Izawa Yasuji , Watoh Yasushi , Tomioka Hideo
Published: July 2006

Desyl halide, α-bromophenylacetate, and 2,5-dimethoxy-α-bromoacetophenones undergo smooth photomethanolysis, whereas simple α-bromoacetophenone undergoes photoreduction to give acetophenone.
SOLUTE–SOLVENT INTERACTION IN PERFLUOROHEXANE
Authors: Kano Koji , Yamamori Seiji , Yanagimoto Masaru , Hashimoto Shizunobu
Published: July 2006

The absorption spectra of benzene and naphthalene revealed the very weak solute–solvent interaction in perfluorohexane (PFH) while the fluorescence lifetime and the fluorescence quantum yield of naphthalene indicated the ordinary relaxation process of the Franck–Condon state in this solvent. These findings suggest that the poor polarizability of the PFH molecules causes the weak solute–solvent interaction in PFH.
STEREOSELECTIVE HYDROLYSIS OF AMINO ACID ESTERS BY MODIFIED POLY(ETHYLENIMINE)S WITH COVALENTLY-LINKED DIPEPTIDE CONTAINING A HISTIDYL RESIDUE
Authors: Kimura Yoshiharu , Nango Mamoru , Ihara Yasuji , Kuroki Nobuhiko
Published: July 2006

Stereoselective hydrolyses of chiral substrates were examined in poly(ethylenimine) derivatives with optically active groups. A high stereoselective effect, kL/kD=3.6, is observed. The effect of the substrate structure influenced both the rate constant and the stereoselective ratio in the hydrolyses by poly(ethylenimine) derivatives.
REGIOSELECTIVE MONOALKYLATION OF 3-METHYL-1,2-CYCLOHEXANEDIONE
Authors: Utaka Masanori , Hojo Makoto , Takeda Akira
Published: July 2006

Monoalkylation of 3-methyl-1,2-cyclohexanedione was achieved regioselectively to give 6-alkyl-3-methyl-1,2-cyclohexanedione as a major product without the formation of O-alkylated or polyalkylated products.
ADDITION REACTION OF TRIMETHYLSILYL AZIDE TOWARDS KETONES AND FACILE FORMATION OF TETRAZOLE DERIVATIVES
Authors: Nishiyama Kozaburo , Watanabe Akio
Published: July 2006

In the presence of Lewis acid such as SnCl2, the reactions of trimethylsilyl azide with ketones readily gave 1:1- or 1:2-adduct, which reacted with Lewis acid to afford tetrazole.