bluuebunny/crossref_metadata_2025 huggingface dataset:
ISOLATION AND RELATIVE REACTIVITIES IN CHROMIUM(VI) OXIDE OXIDATION OF THE ROTAMERS OF 9-(2-FORMYL-1-NAPHTHYL)FLUORENE AND RELATED ALCOHOLS
Authors: Oki Michinori , Saito Ryo
Published: July 2006

Rotational isomers (sp and ap) of 9-(2-formyl-l-naphthyl)fluorene were isolated. ΔH\eweq and ΔS\eweq for rotation (sp → ap) were 24.0 kcal mol−1 and −7.9 e. u., respectively. Oxidation of the sp form afforded the corresponding carboxylic acid smoothly, whereas the ap form reacted very slowly to give a lactone. Oxidations of 9-(2-hydroxymethyl-1-naphthyl)fluorene and 9-[2-(α-hydroxybenzyl)-1-naphthyl]fluorene showed that the relative reactivities of the rotamers of the former were almost the same, while those of the latter differed to a great extent. The results suggest that the steric hindrance to the approach of a base to a proton in E2 elimination is the cause of poor reactivities of the ap forms of the aldehyde and the benzylic alcohol.
REGIOSELECTIVE ADDITION OF CARBONYL COMPOUNDS TO ISOPRENE COORDINATED TO Zr
Authors: Yasuda Hajime , Kajihara Yasushi , Mashima Kazushi , Nagasuna Kinya , Nakamura Akira
Published: July 2006

ZrCp2(isoprene) reacts with aliphatic aldehydes, ketones or nitriles regioselectively on C1-carbon of the isoprene moiety to give novel 2-oxa- or 2-aza-metallacycles which release alcohols or ketones respectively on hydrolysis. In contrast, ZrCH3(η1-methylallyl)Cp2, Ti(η3-methylallyl)Cp2, and [MgCH2C(CH3)=CHCH2]n reacted with acetone on the C3-carbon of the methylallyl or the isoprene unit.
DIRECT SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF ALKYLBENZENESULFONATE WITH 1-(4-N-METHYLPYRIDINIUMAZO)-4-(4-AMINOPHENYLAZO) NAPHTHALENE IODIDE
Authors: Higuchi Keiro , Shimoishi Yasuaki , Miyata Haruo , Tôei Kyoji
Published: July 2006

A new reagent, 1-(4-N-methylpyridiniumazo)-4-(4-aminophenylazo) naphthalene iodide, can react with sodium alkylbenzenesulfonate to show a color change in an aqueous medium. The calibration graph is straight line over the range from 8×10−6 to 3.0×10−5 M of sodium dodecylbenzenesulfonate. The practical molar absorptivity is 1.8×104 1 mol−1 cm−1 at 594 nm.
13C CHEMICAL SHIFTS OF SOLID (1→4)-α-d-GLUCANS BY CROSS POLARIZATION/MAGIC ANGLE SPINNING (CP/MAS) NMR SPECTROSCOPY. CONFORMATION-DEPENDENT 13C CHEMICAL SHIFT AS A REFERENCE IN DETERMINING CONFORMATION IN AQUEOUS SOLUTION
Authors: Saitô Hazime , Tabeta Ryoko
Published: July 2006

13C chemical shifts of linear and cyclic amyloses in solid state were measured by cross polarization/magic angle spinning (CP/MAS) NMR spectroscopy. It is found that rapid conformational isomerism occurs in aqueous solution for amylose and its linear oligomer with lifetime <10−3s with reference to the conformation-dependent 13C chemical shifts obtained in solid state.
REGIOSELECTIVE CARBON–CARBON BOND FORMATION BY REACTION OF Zr-ISOPRENE COMPLEX WITH ALKENES, ALKYNES AND ALKADIENES
Authors: Yasuda Hajime , Kajihara Yasushi , Nagasuna Kinya , Mashima Kazushi , Nakamura Akira
Published: July 2006

The reaction of ZrCp2(isoprene) with 1-butene, 2-butene, 1-pentene and 2-pentene proceeds with highly regioselective carbon–carbon bond formation between C2-carbon of alkenes and C4-carbon of isoprene unit. In the presence of excess isoprene, the Zr-complex showed catalysis for selective tail-to-tail linear dimerization of isoprene. The addition of diphenylacetylene resulted in the release of isoprene to form a zirconacyclo-2,4-pentadiene.
A THERMALLY-INDUCED RADICAL REARRANGEMENT OF 2-ARYLMETHOXYTROPONES TO 3- AND 5-ARYLMETHYLTROPOLONES
Authors: Takeshita Hitoshi , Mametsuka Hiroaki , Chisaka Atsuko , Matsuo Norihide
Published: July 2006

2-Arylmethoxytropones, i.e., 2-benzyloxytropone, 2-(p-tolylmethoxy)tropone, 2-(4-bromophenylmethoxy)tropone, 2-(4-chlorophenylmethoxy)tropone, 2-(4-methoxyphenylmethoxy)tropone, and 2-(1-naphthylmethoxy)tropone, rearranged upon heating to the 3-and 5-arylmethyltropolones via the radical intermediates. Similarly, 5-bromo-2-(p-tolylmethoxy)tropone gave 5-bromo-3-(p-tolylmethyl)tropolone.
TOTAL SYNTHESIS OF (±)-CORONAFACIC ACID
Authors: Nakayama Mitsuru , Ohira Susumu , Okamura Yuichi , Soga Shinji
Published: July 2006

Coronafacic acid, the acidic component of coronatine, was synthesized via the stereospecific alkylation of the tricyclo[4,3,0,01.5]nonane derivative, followed by the fission of cyclopropane ring.
BASIC STUDIES FOR CONTINUOUS DEGRADATION OF HYDROGEN PEROXIDE BY THE HOLLOW FIBER CONTAINING MICROCOCCUS LYSODEIPLICUS IFO 3333 CELLS
Authors: Obata Hitoshi , Sukematsu Takeshi , Tokuyama Tai
Published: July 2006

A hollow fiber containing bacterial cells having high catalase activity was used as a reactor for degradation of hydrogen peroxide. The relative activity of the hollow fiber microbial cells to the intact cells was 57 % at pH 7.0 in a batch-wise reaction. When the hollow fiber reactor was applied to industrial waste water such as bleached wheat bran containing 10 mM hydrogen peroxide, the degradation ratio was 75 % for the first 200 h.
STRUCTURE CONFIRMATION OF TRIS-DEACYL HEAVENLY BLUE ANTHOCYANIN, AN ALKALINE HYDROLYSIS PRODUCT OF HEAVENLY BLUE ANTHOCYANIN OBTAINED FROM FLOWER OF MORNING GLORY “HEAVENLY BLUE”
Authors: Goto Toshio , Kondo Tadao , Imagawa Hiroyuki , Takase Shigehiro , Atobe Masahiko , Miura Iwao
Published: July 2006

Structure of tris-deacyl heavenly blue anthocyanin was determined to be 3-O-(β-sophorosyl)-5-O-(β-glucosyl)peonidin by PMR analysis.
A SELECTIVE SYNTHESIS OF 3-C-(HYDROXYMETHYL)PENTOFURANOSE IN THE FORMOSE REACTION
Authors: Shigemasa Yoshihiro , Hamada Toshio , Hirabayashi Mikio , Waki Eiichi , Nakashima Ruka , Harada Ken-ichi , Takeda Naohito , Suzuki Makoto
Published: July 2006

A selective formose reaction was found to occur giving 3-C-(hydroxymethyl)pentofuranose with high selectivity, when the major part of the dissolved calcium ions were removed as sparingly soluble salts at the end of the induction period, followed by the addition of Pb2O(OH)2 and by adjusting the pH to 10.0 with aqueous KOH, succesively.
STEREOSELECTIVE ADDITION OF READILY AVAILABLE ORGANOCOPPER REAGENTS TO DIMETHYL ACETYLENEDICARBOXYLATE
Authors: Nishiyama Hisao , Sasaki Masaharu , Itoh Kenji
Published: July 2006

Organocopper reagents derived from cuprous bromide-dimethyl sulfide complex with Grignard reagents underwent stereoselective addition to dimethyl acetylenedicarboxylate to give 2-substituted maleates in good yields.
A FACILE ASYMMETRIC SYNTHESIS OF β-SUBSTITUTED ALKANOIC ACID THE HIGHLY STEREOSELECTIVE MICHAEL ADDITION OF GRIGNARD REAGENTS TO α,β-UNSATURATED CARBOXYLIC AMIDES DERIVED FROM l-EPHEDRINE
Authors: Mukaiyama Teruaki , Iwasawa Nobuharu
Published: July 2006

The Michael addition of Grignard reagents to chiral α,β-unsaturated carboxylic amides derived from 1-ephedrine affords highly optically active β-substituted alkanoic acids after acid hydrolysis. This high stereoselectivity is explained by considering the formation of rigid internal chelate complexes.
A NEW METHOD FOR DEOXYGENATION OF HETEROAROMATIC N-OXIDES WITH CHLOROTRIMETHYLSI LANE/SODIUM IODIDE/ZINC
Authors: Morita Tsuyoshi , Kuroda Koji , Okamoto Yoshiki , Sakurai Hiroshi
Published: July 2006

Heteroaromatic N-oxides are easily deoxygenated with chlorotrimethylsilane/sodium iodide/zinc in acetonitrile to give the corresponding parent bases in good yields.
FACILE SYNTHESIS OF TIN(II) CHELATE COMPOUNDS
Authors: Wakeshima Ikuko , Kijima Ichiro
Published: July 2006

Metallic tin reacted readily with bis(1,3-diketonato)copper compounds in an organic solvent to give corresponding bis(1,3-diketonato)tin(II) compounds in excellent yields.
HYDROGEN EVOLUTION AT LaNi5 AND MmNi5 ELECTRODES IN ALKALINE SOLUTIONS
Authors: Kitamura Tohru , Iwakura Chiaki , Tamura Hideo
Published: July 2006

Both LaNi5 and MmNi5 electrodes were prepared and their cathodic polarization characteristics in alkaline solutions were studied. As a result, they were found to have the high electrocatalytic activity for hydrogen evolution, almost comparable to Pt and Pd electrodes.
PREPARATION OF ALLYL VINYL ETHERS BY WITTIG REACTION OF ALLYL FORMATES
Authors: Suda Minoru
Published: July 2006

Substituted allyl vinyl ethers are obtainable by the reaction of allyl formates with Wittig reagents. Reactivity of some of the produced allyl vinyl ethers was also examined.
A CROSS-POLARIZATION MAGIC-ANGLE-SPINNING 29Si-n.m.r. IDENTIFICATION OF THE SILANOL GROUP RESONANCE IN ZSM 5 ZEOLITES
Authors: Nagy Janos B , Gabelica Zelimir , Derouane Eric G
Published: July 2006

A small intensity and rather broad resonance is sometimes observed at ca. −103 ppm in the high resolution solid state 29Si-n.m.r. spectra of ZSM 5 zeolites. Cross polarization experiments, using the occluded tetrapropylammonium species and adsorbed water or n-hexane as the pool for protons, enable the unambiguous assignment of this resonance to silanol groups. Those are possibly associated to the presence of defects in the zeolite lattice.
PALLADIUM-CATALYZED CROSS-COUPLING REACTIONS BETWEEN ALLYL, VINYL OR ARYL HALIDE AND PERFLUOROALKYL IODIDE WITH ZINC AND ULTRASONIC IRRADIATION
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

The reactions of perfluoroalkyl iodides with allyl, vinyl or aryl halides with ultrasonically dispersed zinc in the presence of palladium catalyst proceeded smoothly to give the corresponding allyl, vinyl or aryl perfluoroalkylides in a good yield.
A STEREOSELECTIVE SYNTHESIS OF 2-AMINO-2-DEOXY-d-ARABINOSE AND -d-RIBOSE
Authors: Mukaiyama Teruaki , Miwa Tetsuo , Nakatsuka Takashi
Published: July 2006

Two amino pentoses, 2-acetamido-2-deoxy-d-arabinose and -d-ribose, are conveniently synthesized from 2-amino-2-deoxy-d-pentonic acid derivatives, obtained by the stereoselective reaction of the chiral imine 1 with 2,3-O-isopropylidene-d-glyceraldehyde.
ULTRASOUND-PROMOTED HYDROPERFLUOROALKYLATION OF ALKYNES WITH PERFLUOROALKYLZINC IODIDE AND COPPER(I) IODIDE
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

The reaction of perfluoroalkyl iodides with terminal alkynes and ultrasonically dispersed zinc in the presence of copper(I) iodide proceeded smoothly to give the corresponding vinyl perfluoroalkylides in good yields.
NEW DITERPENOIDS FROM PACHYDICTYON CORIACEUM
Authors: Ishitsuka Midori , Kusumi Takenori , Tanaka Jiro , Kakisawa Hiroshi
Published: July 2006

From Pachydictyon coriaceum, new diterpenoids, acetyldictyolal (7), acetals (5a) and (5b), and acetyldictyol C(9), were isolated.
PODOBLASTIN A, B AND C. NEW ANTIFUNGAL 3-ACYL-4-HYDROXY-5,6-DIHYDRO-2-PYRONES OBTAINED FROM PODOPHYLLUM PELTATUM L
Authors: Miyakado Masakazu , Inoue Satoru , Tanabe Yoo , Watanabe Keisuke , Ohno Nobuo , Yoshioka Hirosuke , Mabry Tom J
Published: July 2006

The potent antifungal constituent against Pyricularia oryzae Cav. obtained from Podophyllum peltatum L. has been disclosed to be a mixture of three new 3-acyl-4-hydroxy-5,6-dihydropyrones (podiblastin A, B and C). The absolute configuration at C-6 of podoblastins was determined to be (R).
A NEW 3-ACYL-4-HYDROXY-2-PYRONE SYNTHESIS AND ITS APPLICATION TO TOTAL SYNTHESIS OF (±) PODOBLASTIN A, B AND C
Authors: Tanabe Yoo , Miyakado Masakazu , Ohno Nobuo , Yoshioka Hirosuke
Published: July 2006

A new general method for preparation of 3-acyl-4-hydroxy-2-pyrones has been developed. The new method includes a Fries type rearrangement of enol-acyl group toward adjacent carbon atom, by which the new and potent fungicides, podoblastin A, B and C have been synthesized for the confirmation of the structures.
BIOMIMETIC CONVERSION OF EPOXYGERMACRENE-D TO A NOVEL SESQUITERPENE OF THE PLANT TORILIS JAPONICA DC.
Authors: Yamamura Shosuke , Niwa Masatake , Ito Masatoki , Saito Yoshihiko
Published: July 2006

Epoxygermacrene-D was treated with basic alumina to afford a new type of sesquiterpene, whose stereostructure was determined on the basis of its spectral data coupled with an X-ray crystallographic analysis of the corresponding ketone produced on CrO3 oxidation.
COMPARATIVE MEASUREMENTS OF PHOTOCURRENT QUANTUM EFFICIENCY: FLUOROMETRIC, THERMOMETRIC AND ACTINOMETRIC METHODS APPLIED TO A FLUORESCENT POLYCRYSTALLINE ZnO ELECTRODE
Authors: Fujishima Akira , Maeda Yasuhisa , Suzuki Sachio , Honda Kenichi
Published: July 2006

The three methods in the title were directly compared by using an electrode made of luminescent Cu2+-doped ZnO. The values of the quantum efficiency as measured by the three methods were in good agreement. The feasibility of the methods is briefly discussed.
NEW HYDROAZULENOID DITERPENES FROM THE MARINE ALGA DICTYOTA DICHOTOMA
Authors: Enoki Nobuyasu , Ishida Ryoichi , Urano Shiro , Ochi Masamitsu , Tokoroyama Takashi , Matsumoto Takeshi
Published: July 2006

Four new diterpenes have been isolated from a Japanese brown alga and their structures have been shown to be expressed by 2, 3, 4 and 5, on the basis of spectral and chemical means.
A FACILE SYNTHETIC APPROACH TO THE FRAGMENT D OF ANTIBIOTIC NOSIHEPTIDE, 2-[1-AMINO-3-CARBOXY-3-HYDROXY-(1S,3S)-PROPYL]-THIAZOLE-4-CARBOXYLIC ACID
Authors: Iwakawa Masaharu , Kobayashi Yasunobu , Ikuta Shun-ichi , Yoshimura Juji
Published: July 2006

The lactam corresponding to fragment D of a polypeptide antibiotic nosiheptide was prepared via oxidation of the corresponding thiazolidine-4-carboxylate obtained by the condensation of 2-azido-2,3-dideoxy-d-threo-pentoalduronate with l-cysteine methyl ester.
COPPER(I) IODIDE-PROMOTED CYCLIZATION OF N-2-HALOARYL-AND N-(2-HALOARYL)METHYL-SUBSTITUTED ENAMINONES
Authors: Osuka Atsuhiro , Mori Yasuo , Suzuki Hitomi
Published: July 2006

Anions derived from the title compounds are found to undergo smooth cyclization to give indoles and dihydroisoquinolines, respectively, on being heated in the presence of copper(I) iodide in hexamethylphosphoric triamide.
SYNTHESIS OF MACROCYCLIC LACTONES APPLYING INTRAMOLECULAR 1,3-DIPOLAR CYCLOADDITION: SYNTHESIS OF (±)-A26771B
Authors: Asaoka Morio , Abe Masayoshi , Mukuta Takashi , Takei Hisashi
Published: July 2006

The intramolecular 1,3-dipolar cycloaddition of the nitrile oxides derived from ω-nitroalkyl acrylates gave isoxazoline fused macrocyclic lactones. The direction of 1,3-dipolar cycloaddition is strongly affected by the ring size of forming lactones. Utilizing this method, total synthesis of (±)-A26771B was achieved.
PALLADIUM-CATALYZED TRANSFORMATION OF ARENEDIAZONIUM SALTS TO ACYL ARENES BY ORGANOTIN COMPOUNDS AND CARBON MONOXIDE
Authors: Kikukawa Kiyoshi , Kono Kiyoshi , Wada Fumio , Matsuda Tsutomu
Published: July 2006

Arenediazonium salts (ArN2X; Ar=2-Me–C6H4, 3-Me–C6H4, 4-Me–C6H4, 2-Cl–C6H4, 4-Cl–C6H4, 4-Br–C6H4, 4-I–C6H4, 3-NO2–C6H4, 4-NO2–C6H4 and C6H5; X=BF4 and PF6) were effectively transformed to acyl arenes (ArCOR; R=Me, Et and Ph) in good yields (55–90%) by R4Sn and CO under palladium catalysis.
CROWN COMPLEXANES. CARBOXYMETHYL AND PHOSPHONOMETHYL DERIVATIVES OF AZA-CROWN ETHERS
Authors: Tazaki Masato , Nita Kazuhide , Takagi Makoto , Ueno Keihei
Published: July 2006

The complexane-type chelating agents were derived from aza-crown ethers either by N-carboxymethylation or N-phosphonomethylation. The macrocyclic complexanes obtained (crown complexanes) interacted in aqueous media with various metal ions with an uncommon selectivity. The metal ions are incorporated in the crown ether ring on complexation.
REACTIONS OF PHENYLYTTERBIUM σ COMPLEX WITH BENZOYL CHLORIDE AND METHYL BENZOATE: A SELECTIVE KETONE SYNTHESIS
Authors: Fukagawa Toshihiro , Fujiwara Yuzo , Taniguchi Hiroshi
Published: July 2006

Phenylytterbium iodide (Ph–Yb–I) has been found to react with benzoyl chloride to give both triphenylcarbinol and benzophenone. When Ph–Yb–I is added inversely to benzoyl chloride, especially in the presence of FeCl3, the ketone is obtained selectively in modest yields in contrast to the Grignard reaction.
NEW SYNTHETIC APPROACH TO PYRANONAPHTHOQUINONE ANTIBIOTICS, (±)-NANAOMYCIN A AND (±)-DEOXYFRENOLICIN
Authors: Naruta Yoshinori , Uno Hidemitsu , Maruyama Kazuhiro
Published: July 2006

The new total synthesis of pyranonaphthoquinone antibiotics, (±)-nanaomycin A (1) and (±)-deoxyfrenolicin (2), is discussed. The key step in the reaction sequence is Lewis acid mediated Michael addition of acylnaphthoquinone (5) with methyl 2-(dimethylphenylsilyl)-3-butenoate (7).
AN IMPROVED METHOD FOR THE CONVERSION OF SACCHARIDES INTO FURFURAL DERIVATIVES
Authors: Hamada Kazuhiko , Yoshihara Hiroshi , Suzukamo Gohfu
Published: July 2006

An improved method for the preparation of furan compounds by dehydrating saccharides with hydrochloric acid either in a mixture containing water, organic solvent and a catalytic amount of a surface active agent or in the presence of magnesium halide is described.
A USEFUL ZINC REAGENT FOR THE PREPARATION OF 2-OXO-1,1-DIFLUOROALKYLPHOSPHONATES
Authors: Burton Donald J , Ishihara Takashi , Maruta Masamichi
Published: July 2006

The treatment of dialkyl bromodifluoromethylphosphonates with activated zinc dust in various solvents gave dialkoxyphosphinyldifluoromethy1zinc compounds 2, which were acylated with acid halides or fluorinated acid anhydride to afford dialkyl 2-oxo-1,1-difluoroalkylphosphonates in good yields.
STRUCTURES OF LASIOCARPANIN, RABDOLASIONAL, AND CARPALASIONIN: NEW DITERPENOIDS FROM RABDOSIA LASIOCARPA
Authors: Takeda Yoshio , Fujita Tetsuro , Chen Cheng-Chang
Published: July 2006

Three new diterpenoids, lasiocarpanin, rabdolasional, and carpalasionin were isolated from the stem and leaves of Rabdosia lasiocarpa and their structures were elucidated from spectral and chemical findings.
MECHANISM OF C–H INSERTION OF CARBENE IN RIGID MATRIX
Authors: Tomioka Hideo , Ozaki Yasuji , Izawa Yasuji
Published: July 2006

C–H insertion process of phenylchlorocarbene, a ground state singlet carbene, is not affected by matrix which generally exerts its effect in C–H insertion of most arylcarbenes. This reveals the origin of the matrix effects on carbene reactions.
STEREOSELECTIVE SYNTHESIS OF 1-O-ACYL-d-GLUCOPYRANOSE FROM 1-HYDROXY SUGAR AND ACYL FLUORIDES BY THE PROMOTION OF CESIUM FLUORIDE
Authors: Shoda Shin-ichiro , Mukaiyama Teruaki
Published: July 2006

In the presence of cesium fluoride, the reaction of 2,3,4,6-tetra-O-benzyl-d-glucopyranose with acyl fluorides affords the corresponding glucosyl esters in good yields under essentially neutral condition. The α⁄β ratio of produced glucosyl esters is greatly affected by reaction conditions and predominant formations of each anomer is achieved by procedures described herein.
ISOLATION OF FOUR INDOLIZINO[8,7-b]INDOLE-5-CARBOXYLIC ACIDS FROM CLERODENDRON TRICHOTOMUM THUNB
Authors: Toyoda Yasuhiro , Kumagai Hiroaki , Irikawa Hajime , Okumura Yasuaki
Published: July 2006

Four indolizino[8,7-b]indole-5-carboxylic acids were isolated as the methyl esters from Clerodendron trichotomum Thunb, and the structures elucidated on the basis of their spectral and chemical evidences.
PHOTOSENSITIZING ACTION OF EOSIN Y FOR VISIBLE LIGHT INDUCED HYDROGEN EVOLUTION FROM WATER
Authors: Misawa Hiroaki , Sakuragi Hirochika , Usui Yoshiharu , Tokumaru Katsumi
Published: July 2006

Eosin Y was not photobleached with triethanolamine (TEOA) on visible light irradiation in the presence of methyl viologen (Mv2+), and worked as an effective sensitizer to reduce Mv2+ into MV+· with TEOA in aqueous ethanol. The resulting MV+· reduced water to hydrogen in the presence of colloidal platinum in the same solvent. The quantum yield for MV+· formation was measured to be ca. 0.3.
THE ROLE OF SULFITE ANION AS A HOLE SCAVENGER IN THE PHOTOCATALYTIC HYDROGEN FORMATION FROM WATER ON CdS SEMICONDUCTOR UNDER ILLUMINATION OF VISIBLE LIGHT
Authors: Aruga Tetsuya , Domen Kazunari , Naito Shuichi , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

Photocatalytic hydrogen evolution from water by visible light was investigated employing CdS as a semiconductor. It was demonstrated that sulfite anion (SO32−) is a sufficient hole scavenger to prevent the photocorrosion of CdS. The effect of doped Pt on CdS was also investigated, which enhanced the rate 45 times compared to the case of CdS alone.
MECHANISM OF FORMATION OF METHYL FORMATE FROM FORMALDEHYDE OVER COPPER CATALYSTS
Authors: Takahashi Kazunari , Takezawa Nobutsune , Kobayashi Haruo
Published: July 2006

Formation of methyl formate from formaldehyde was markedly enhanced by the presence of methanol over copper-silica and support-free copper catalysts. It was revealed that in the presence of methanol the formation proceeded through the route as (Remark: Graphics omitted.).
A SILYL-FUNCTIONALIZED ALKYL AZIDE, TRIMETHYLSILYLMETHYL AZIDE; SYNTHESIS AND CYCLOADDITION REACTION TO ACETYLENIC DIPOLAROPHILES
Authors: Tsuge Otohiko , Kanemasa Shuji , Matsuda Koyo
Published: July 2006

Thermally stable trimethylsilylmethyl azide was first synthesized from the reaction of chloromethyltrimethylsilane with sodium azide. Its use as an α-functionalized synthetic equivalent of methyl azide was demonstrated in the reaction with acetylenic dipolarophiles and the subsequent reaction of the cycloadducts with aldehydes and water in the presence of fluoride ion.
THE DIRECT SYNTHESIS OF α,β-UNSATURATED CARBONYL COMPOUNDS BY Pd(II) PROMOTED DEHYDROGENATION OF ALDEHYDES AND KETONES
Authors: Mukaiyama Teruaki , Ohshima Masahiro , Nakatsuka Takashi
Published: July 2006

α,β-Unsaturated aldehydes are prepared by the direct dehydrogenation of the corresponding saturated aldehydes by the coupled use of PdCl2(PhCN)2–AgOSO2CF3 in the presence of N-methylmorpholine in good yields. α,β-Unsaturated ketones are also prepared via the Sn(II) enolate by a one-pot procedure from the corresponding saturated ketones.
FLUORIDE-INDUCED 1,2-ELIMINATION OF O-TRIMETHYLSILYLPHENYL TRIFLATE TO BENZYNE UNDER MILD CONDITIONS
Authors: Himeshima Yoshio , Sonoda Takaaki , Kobayashi Hiroshi
Published: July 2006

Fluoride-induced 1,2-elimination of o-trimethylsilylphenyl triflate provided a convenient route to benzyne under mild conditions where detriflation from an intermediary aryl anion appeared to occur in preference to protonation even in the presence of alcohols.
CARBON–CARBON BOND FORMATION WITH METALLIC MANGANESE
Authors: Hiyama Tamejiro , Sawahata Miwa , Obayashi Michio
Published: July 2006

Metallic manganese is found to reduce allylic bromides and achieve the Barbier-type carbonyl addition of allyl unit.
PALLADIUM-CATALYZED ALLYLATION OF KETONES AND ALDEHYDES WITH ALLYLIC CARBONATES VIA SILYL ENOL ETHERS UNDER NEUTRAL CONDITIONS
Authors: Tsuji Jiro , Minami Ichiro , Shimizu Isao
Published: July 2006

Silyl enol ethers are converted to 2-allyl ketones and aldehydes by the reaction with allylic carbonates in the presence of a palladium-phosphine catalyst.
EFFICIENT CATALYTIC GASIFICATION OF CELLULOSE FOR PRODUCTION OF HYDROGEN AND CARBON MONOXIDE
Authors: Yokoyama Shin-ya , Ogi Tomoko , Koguchi Katsuya , Nakamura Etsuro
Published: July 2006

Synthesis gas of hydrogen and carbon monoxide mixture in about 1:1 ratio was efficiently produced by thermal catalytic gasification of cellulose with steam in the presence of KOH and Ni compounds at 800 °C.
A CONVENIENT SYNTHESIS OF KETOXIMES FROM GRIGNARD REAGENTS AND NITRO COMPOUNDS ACTIVATED BY N,N-DIMETHYLCHLOROMETHYLENIMINIUM CHLORIDE
Authors: Fujisawa Tamotsu , Kurita Yoshitsugu , Sato Toshio
Published: July 2006

Ketoximes were synthesized in high yields with a new carbon–carbon bond formation by regioselective nucleophilic attack of Grignard reagents at the α-position of aci-nitroalkanes activated by N,N-dimethylchloromethyleniminium chloride in the presence of a catalytic amount of copper(I) iodide under mild conditions.
INVESTIGATION OF THE FACTORS AFFECTING THE 29Si MAS NMR LINEWIDTHS OF ZEOLITES
Authors: Fyfe C A , Gobbi G C , Murphy W J , Ozubko R S , Slack D A
Published: July 2006

The study of 29Si MAS NMR spectra of zeolites of both low and high Si/Al ratios has provided insight on the factors affecting the residual 29Si line-widths of these materials. It is found that the residual linebroadening in low Si/Al ratio zeolites is due to the distribution of local environments of a particular Si(nAl) type, resulting from the distribution of aluminium atoms in second and further coordination spheres. This is complicated in some cases by a distribution of chemical shifts resulting from crystallographic inequivalence, each of which is subject to the above environmental broadening factors.
NEW ANTIMICROBIAL DITERPENES, DICTYOL F AND EPIDICTYOL F, FROM THE BROWN ALGA DICTYOTA DICHOTOMA
Authors: Enoki Nobuyasu , Tsuzuki Kazuo , Omura Satoshi , Ishida Ryoichi , Matsumoto Takeshi
Published: July 2006

The methanol extract of the brown seaweed Dictyota dichotoma inhibited the growth of microbes. Three active constituents were found to be diterpene alcohols having the hydroazulene skeleton.
KUMAUSYNES AND DEACETYLKUMAUSYNES, FOUR NEW HALOGENATED C-15 ACETYLENES FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Suzuki Teruaki , Koizumi Kuniko , Suzuki Minoru , Kurosawa Etsuro
Published: July 2006

Four new halogenated C15-nonterpenoids which are unusual oxolane derivatives have been isolated from the red alga L. nipponica Yamada, and their structures were determined by spectral and chemical evidence.
ALDEHYDE ENOLATE. CROSS ALDOL REACTION via TIN(II) ENOLATE
Authors: Kato Jun-ichi , Mukaiyama Teruaki
Published: July 2006

Tin(II) enolate, formed in situ by the oxidative addition of metallic tin to 2-bromo-2-methylpropanal, reacts with aldehydes to give β-hydroxy aldehydes in fairly good yields.
RESONANCE RAMAN SPECTRA OF LIGHT-HARVESTING BACTERIOCHLOROPHYLL a IN PIGMENT–PROTEIN COMPLEXES FROM PURPLE PHOTOSYNTHETIC BACTERIA
Authors: Hayashi Hidenori , Hamaguchi Hiro-o , Tasumi Mitsuo
Published: July 2006

Resonance Raman spectra of light-harvesting bacteriochlorophyll (Bchl)–protein complexes from several species of purple photosynthetic bacteria were measured. Some differences in the Raman spectra were found between the Bchl molecules (in the complexes) which give an absorption band in the 870–890 nm region and those which give absorption bands in the 800–850 nm region.
REACTION BEHAVIOR OF CARBON–CARBON AND CARBON–HYDROGEN BONDS IN SUPER ACIDS. CARBOXYLATION OF ALKYL METHYL KETONES WITH CARBON MONOXIDE AND WATER
Authors: Yoneda Norihiko , Sato Haruhiko , Fukuhara Tsuyoshi , Takahashi Yukio , Suzuki Akira
Published: July 2006

In a HF–SbF5 solution at −20∼30 °C under atmospheric pressure, ketones having alkyl groups with five or more carbon atoms underwent the reaction to give corresponding oxo carboxylic acids without any β-scission processes which occur readily in alkyl cations derived by protolysis of alkanes with seven or more carbon atoms. Tertiary C–H bond located at δ or further away from the oxo group in the substrates could react exclusively to give (ω–1)-oxo-2,2-dimethyl carboxylic acids at −20 °C.
DETERMINATION OF SILICON-ALUMINIUM ORDERINGS IN MORDENITE AND ITS ALUMINIUM DEFICIENT FORMS USING HIGH-RESOLUTION MAGIC-ANGLE-SPINNING 29Si-NMR
Authors: Debras G , Nagy J B , Gabelica Z , Bodart P , Jacobs P A
Published: July 2006

A series of chemically dealuminated mordenites were investigated by 29Si and 27Al NMR spectroscopy. High-resolution magic-angle-spinning (HRMAS) solid state 29Si NMR lines with varying intensity were observed at δ=−95, −105 and −110 ppm. When it is assumed that the Al atoms are located exclusively in the 4-membered rings of the structure, these variations can be explained by assigning the resonance lines to silicon atoms surrounded by 2, 1 and 0 Al atoms respectively. The 27Al NMR spectrum yields quantitative information on the amount of octahedrally coordinated aluminium formed during various chemical treatments of Na-mordenite.
PREPARATION OF PHENYL ARYL SULFIDES BY REACTION OF BENZYNE WITH ETHYL ARYL SULFIDES
Authors: Nakayama Juzo , Fujita Toko , Hoshino Masamatsu
Published: July 2006

A variety of ethyl aryl sulfides (1) react with benzyne, with evolution of ethylene, to give phenyl aryl sulfides (3) in excellent yields, thus providing a general synthesis of 3 from arenethiols since 1 are quantitatively obtainable from arenethiols and ethyl bromide.
HYDROGEN EVOLUTION ON SURFACE-MODIFIED SILICON POWDER PHOTOCATALYSTS IN AQUEOUS ETHANOL SOLUTIONS
Authors: Taniguchi Yoshikuni , Yoneyama Hiroshi , Tamura Hideo
Published: July 2006

Illumination of n-type Si powder photocatalysts whose anodic surfaces and cathodic surfaces were coated with polypyrrole and platinized Ag, respectively, caused hydrogen evolution from aqueous ethanol for longer than 150 h with a quantum efficiency of 2.1 % at 550 nm.
SYNTHESIS OF METALLOPHTHALOCYANINES FROM PHTHALONITRILE WITH STRONG ORGANIC BASES
Authors: Tomoda Haruhiko , Saito Shojiro , Shiraishi Shinsaku
Published: July 2006

Several metallophthalocyanines (MPc: M=Ni(II), Co(II), Zn(II), Pb(II), Fe(II), Sn(II), Cd(II), Mg(II), and Mn(III)) were obtained by heating phthalonitrile with metal salts in alcohols in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene. Metal acetylacetonates as well as metal halides were available as metal sources for preparation of metallophthalocyanines by this method.
A NOVEL METHOD FOR THE SYNTHESIS OF ALKYNYL KETONES—A REACTION OF ALKYNYL BORANES WITH AMIDES
Authors: Yamaguchi Masahiko , Waseda Toshie , Hirao Ichiro
Published: July 2006

Alkynyl ketones are synthesized in high yields by the reaction of alkynyl boranes and amides under a mild reaction condition.
ONE-STEP OXIDATION OF BENZENE TO PHENOL UNDER AMBIENT CONDITIONS
Authors: Sasaki Kazuo , Ito Sotaro , Saheki Yukitami , Kinoshita Tatsuaki , Yamasaki Toshimichi , Harada Junji
Published: July 2006

Aerial oxidation of benzene suspended in aqueous sulfuric acid produces an appreciable amount of phenol. The reaction proceeds under ambient conditions only when cuprous ions are present in the solution.
REACTIONS OF TUNGSTEN–DINITROGEN COMPLEXES WITH IODOTRIMETHYLSILANE. FORMATION OF Si–N BOND FROM LIGATING DINITROGEN
Authors: Komori Keiko , Kodama Teruyuki , Jin Dou-Man , Takahashi Tamotsu , Uchida Yasuzo , Hidai Masanobu
Published: July 2006

The dinitrogen complex cis-[W(N2)2(PMe2Ph)4] reacts with Me3SiI at 50°C to give [WI(N2SiMe3)(PMe2Ph)4], which is further converted into [WI2(N2HSiMe3)(PMe2Ph)3] by treatment with HI. The molecular structure of the latter complex has been determined by X-ray crystallographic analysis, which clearly shows the Me3Si group bonded to the β-nitrogen from the metal.
STRUCTURES OF TWO NEW HALOGENATED CHAMIGRANE-TYPE SESQUITERPENOIDS FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Kurata Kazuya , Suzuki Teruaki , Suzuki Minoru , Kurosawa Etsuro , Furusaki Akio , Suehiro Katsunao , Matsumoto Takeshi , Katayama Chuji
Published: July 2006

Two new halo-chamigrane derivatives have been isolated from the title alga and the structure of one of them was determined on the basis of the spectral and chemical evidence. The structure of another compound was established by X-ray diffraction study of its monoacetate epoxide.
A FACILE SYNTHETIC ROUTE TO SOME ARYLMALONONITRILES
Authors: Suzuki Hitomi , Kobayashi Tsutomu , Osuka Atsuhiro
Published: July 2006

Copper(I) iodide-assisted reaction of aryl iodides with malononitrile anion provides a convenient route to some arylmalononitriles.
LUPEOLACTONE, A NEW β-LACTONE FROM ANTIPESMA PENTANDRUM MERR.
Authors: Kikuchi Hiroyuki , Tensho Akira , Shimizu Iwao , Shiokawa Hideaki , Kuno Atsushi , Yamada Seiichiro , Fujiwarat Takaji , Tomitat Ken-ichi
Published: July 2006

The structure of lupeolactone, a new triterpene β-lactone from Antidesma pentandrum Merr., has been dertermined from spectroscopic and X-ray crystallographic analyses.
REDUCTIVE CONVERSION OF NITRO ALKENES TO KETONES AND/OR OXIMES IN AN AQUEOUS HClO4–CH2Cl2–DIOXANE–(Pb) SYSTEM
Authors: Torii Sigeru , Tanaka Hideo , Katoh Tetsuo
Published: July 2006

Electrochemical and chemical reduction of nitro alkenes in an aqueous HClO4–CH2Cl2–dioxane–(Pb) system afforded ketones and oximes in good yields, each of which can be obtained selectively by treating with either aqueous formaldehyde or hydroxylamine as a proper workup process, respectively.
CONVERSION OF RACEMIC CYANOHYDRIN INTO ONE OPTICALLY ACTIVE ISOMER IN THE PRESENCE OF BRUCINE
Authors: Toda Fumio , Tanaka Koichi
Published: July 2006

When a solution of a cyanohydrin and brucine in methanol was kept at room temperature, one optically active isomer of the cyanohydrin was obtained as brucine complex in a yield of more than 50%.
THE STRUCTURES OF (3Z)-EPOXYVENUSTIN, (3Z)-VENUSTIN, AND (3Z)-VENUSTINENE, NEW HALOGENATED C15-NONTERPENOIDS FROM THE RED ALGA LAURENCIA VENUSTA YAMADA
Authors: Suzuki Minoru , Kurosawa Etsuro , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

Three new halogenated nonterpenoid C15-compounds have been isolated from the red alga Laurencia venusta Yamada. The structure of (3Z)-epoxyvenustin was confirmed by X-ray diffraction analysis. The structures of (3Z)-venustinene containing a novel propyl side chain and (3Z)-venustin were deduced from their spectral evidence.
SYNTHESIS OF METHYL HEXAACETYL-TUNICAMINYL URACIL
Authors: Suami Tetsuo , Sasai Hiroaki , Matsuno Kazuhiro
Published: July 2006

A C11-carbohydrate named tunicamine, which is a component of antibiotic tunicamycins, has been synthesized in a form of polyacetyl derivative. From the tunicamine derivative, a nucleoside moiety of the antibiotic designated as tunicaminyl uracil has been successfully synthesized.
SELECTIVE REDUCTION WITH LITHIUM ALUMINUM HYDRIDE/DIPHOSPHORUS TETRAIODIDE. A MILD CONVERSION OF AROMATIC KETONES TO PARENT HYDROCARBONS
Authors: Suzuki Hitomi , Masuda Reiko , Kubota Hirohisa , Osuka Atsuhiro
Published: July 2006

Treatment of aromatic ketones with the title reagent in boiling benzene gives parent hydrocarbons in good to moderate yields.
PALLADIUM-CATALYZED AROMATIC AMINATION OF ARYL BROMIDES WITH N,N-DI-ETHYLAMINO-TRIBUTYLTIN
Authors: Kosugi Masanori , Kameyama Masayuki , Migita Toshihiko
Published: July 2006

The reaction of N,N-diethylamino-tributyltin with aryl bromides in the presence of a catalytic amount of PdCl2(o-tolyl3P)2 gave N,N-diethylaminobenzene derivatives. The reaction is a new kind of amination different from ones through aryne or SRN1 mechanise
CONVERSION OF METHANOL TO LOW MOLECULAR WEIGHT HYDROCARBONS OVER Ti ION EXCHANGED FORM OF LAYERED SILICATE MINERALS
Authors: Morikawa Yutaka , Wang Fey-long , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

The acid amount on layered silicate minerals increases remarkably by exchanging the interlayer cations with Ti ions. The catalytic activity of the minerals for the conversion of methanol is also improved markedly by the treatment. Over Ti ion exchanged form of activated clay, methanol is selectively converted to lower olefins and the chain growth is limited at C6.
NEOLAURALLENE, A NEW HALOGENATED C-15 NONTERPENOID FROM THE RED ALGA LAURENCIA OKAMURAI YAMADA
Authors: Suzuki Minoru , Kurosawa Etsuro , Furusaki Akio , Katsuragi Shin-ichiro , Matsumoto Takeshi
Published: July 2006

The structure and the absolute configuration of a new C-15 bromoallene, which has been isolated from the red alga Laurencia okamurai Yamada, were confirmed by X-ray crystallographic analysis.
THE EFFECT OF STRONG INTERACTION BETWEEN Ru AND Al2O3 ON THE ACTIVITY FOR CARBON MONOXIDE HYDROGENATION OVER Ru/Al2O3
Authors: Okada Osamu , Ipponmatsu Masamichi , Kawai Maki , Aika Kenichi , Onishi Takaharu
Published: July 2006

Hydrogenation of CO over Ru/Al2O3 was examined. It was found for the first time, that when the catalyst was strongly reduced, the CO conversion activity for the CO–H2 reaction increased and surface Ru on strongly reduced catalyst was determined to be electronegatively charged, by X-ray photoelectron spectroscopy (XPS).
SYNTHESIS OF ANHYDRO-3-PHENYL-5-DICYANOMETHYL-1,2,3-OXADIAZOLIUM HYDROXIDE. AN EXO-METHYLENE ANALOG OF SYDNONE
Authors: Araki Shuki , Mizuya Jiro , Butsugan Yasuo
Published: July 2006

As the first exo-methylene analog of sydnone, the title compound was synthesized by the treatment of 3-phenylsydnone with trifluoromethanesulfonic anhydride followed by the reaction with malononitrile-triethylamine. The electronic structure is discussed on the basis of the spectroscopic evidences.
HIGH RESOLUTION SOLID STATE MAS 11B-NMR EVIDENCE OF BORON INCORPORATION IN TETRAHEDRAL SITES OF ZEOLITES
Authors: Gabelica Z , Nagy J B , Bodart P , Debras G
Published: July 2006

High resolution solid state MAS 11B-NMR was used to detect quantitatively variously coordinated BOx structural units in zeolites. Boron stemming from Pyrex autoclaves is progressively incorporated into the tetrahedral sites of ZSM-5 and mordenite frameworks during synthesis. The final crystalline zeolite phases may contain up to 0.8 B atoms in their unit cells.
SYNTHESIS OF 2-VINYL-8-QUINOLINOL AND MEASUREMENT OF STABILITY OF ITS METAL COMPLEXES
Authors: Yoneda Akio , Azumi Takatsugu
Published: July 2006

2-Vinyl-8-quinolinol was prepared in 30% yield from 2-formyl-8-quinolinol by Wittig reaction. The acid dissociation constants of 2-vinyl-8-quinolinol and the stability constants of the chelates of the reagent with some divalent metals have been determined by titration techniques. The chelates are less stable than those of 8-quinolinol and 2-methyl-8-quinolinol.
TITANIUM TETRACHLORIDE PROMOTED REDUCTION OF ALKENYL SULFIDES USING TRIETHYLSILANE AS A REDUCING AGENT
Authors: Takeda Takeshi , Tsuchida Toshio , Fujiwara Tooru
Published: July 2006

Alkenyl sulfides were reduced to the corresponding alkyl sulfides with triethylsilane in the presence of titanium tetrachloride in good yields. The reduction proceeds via -phenylthioalkyltitanium intermediate.
RECIOSELECTIVE ALKYL GROUP INTRODUCTION AT THE 3-POSITION OF PYRIDINE VIA 1,4-BIS(TRIMETHYLSILYL)-1,4-DIHYDROPYRIDINE
Authors: Tsuge Otohiko , Kanemasa Shuji , Naritomi Toshio , Tanaka Junji
Published: July 2006

The reaction of 1,4-bis(trimethylsilyl)-1,4-dihydropyridine with aldehydes and ketones in the presence of tetrabutylammonium fluoride offers a convenient method for the preparation of 3-alkylpyridines.
LAURENONES A AND B, NEW SESQUITERPENES, FROM THE RED ALGA LAURENCIA NIPPONICA YAMADA
Authors: Fukuzawa Akio , Matsue Hideki , Masamune Tadashi , Furusaki Akio , Katayama Chuji , Matsumoto Takeshi
Published: July 2006

The structure of two new sesquiterpenes, isolated from the title alga and named laurenones A and B, was determined on the basis of the X-ray crystallography as well as the spectral data.
A NOVEL AND CONVENIENT REGIO-CONTROLLED SYNTHESIS OF α-HALOGEN-SUBSTITUTED ALLYLSILANES. STEREOSELECTIVE SYNTHESIS OF Z-ALKENYL HALIDES
Authors: Hosomi Akira , Ando Masatomo , Sakurai Hideki
Published: July 2006

α-Halogen-substituted allylsilanes, prepared conveniently by the in situ reaction of lithiated allyl halides with chlorosilane in a regio-controlled manner, react with various electrophiles to give the corresponding alkenyl halides with high Z preference.
COMBINATION OF BORANE-DIMETHYL SULFIDE COMPLEX WITH CATALYTIC SODIUM TETRAHYDROBORATE AS A SELECTIVE REDUCING AGENT FOR α-HYDROXY ESTERS. VERSATILE CHIRAL BUILDING BLOCK FROM (S)-(−)-MALIC ACID
Authors: Saito Seiki , Hasegawa Takashi , Inaba Masami , Nishida Ryosuke , Fujii Toshikazu , Nomizu Seiya , Moriwake Toshio
Published: July 2006

Borane-dimethyl sulfide complex has proven to be an efficient and selective reducing agent in the presence of catalytic sodium tetrahydroborate for α-hydroxy esters as exemplified in the reduction of dimethyl (S)-(−)-malate, providing the versatile chiral building block of four-carbon backbone.
LITHIUM INTERCALATION AND ELECTROCHROMISM IN β-ZrNCl LAYERED CRYSTAL
Authors: Yamanaka Shoji , Ohashi Masao , Sumihara Masanori , Hattori Makoto
Published: July 2006

A layer structured crystal β-zirconium nitride chloride ZrNCl has been found to form a new lithium intercalate. The intercalation occurs either by the n-butyl lithium technique or by electrochemical redox reactions. The layer crystal exhibits electrochromic behavior on intercalation-deintercalation of the lithium.
STRUCTURE OF PLECTRIN, AN APHID ANTIFEEDANT DITERPENE FROM PLECTRANTHUS BARBATUS
Authors: Kubo Isao , Matsumoto Takeshi , Tori Motoo , Asakawa Yoshinori
Published: July 2006

The efficient isolation and characterization of plectrin, a highly reactive diterpenoid isolated from Plectranthus barbatus is reported. Plectrin exhibits antifeedant activity against an important pest aphid Schizaphis graminum.
CHEMICAL SHIFT DISPERSION DUE TO CRYSTALLOGRAPHIC INEQUIVALENCE AND IMPLICATIONS REGARDING THE INTERPRETATION OF THE HIGH-RESOLUTION 29Si MAS NMR SPECTRA OF ZEOLITES
Authors: Fyfe C A , Gobbi G C , Kennedy G J , Schutter C T De , Murphy W J , Ozubko R S , Slack D A
Published: July 2006

The 29Si MAS NMR spectra of dealuminated zeolites have been studied, where the chemical shift dispersion due to structurally distinct SiO4, tetrahedra is comparable (or greater) in magnitude to first coordination sphere effects. The results 29Si suggest that some previous Si peak assignments are incorrect and that a detailed interpretation of some zeolite spectra is complex.
HELICAL SUPERSTRUCTURES ARE FORMED FROM CHIRAL AMMONIUM BILAYERS
Authors: Nakashima Naotoshi , Asakuma Sumitoshi , Kim Jong-Mok , Kunitake Toyoki
Published: July 2006

Electron microscopy showed the growth of vesicles of chiral ammonium amphiphiles to helical aggregates. The transformation was determined by the physical state and the chemical structure of the components.
THE SYNTHESIS OF GLYCOSYL FLUORIDES USING PYRIDINIUM POLY(HYDROGEN FLUORIDE)
Authors: Szarek Walter A , Grynkiewicz Grzegorz , Doboszewski Bogdan , Hay George W
Published: July 2006

Partially protected monosaccharides, having the anomeric hydroxyl group underivatized, react with poly(hydrogen fluoride) to yield the corresponding glycosyl fluorides.
ONE-ELECTRON PHOTOREDUCTION OF N,N′-1,3-PROPANO-BRIDGED INDIGO
Authors: Setsune Jun-ichiro , Matsuura Toshikazu , Fujiwara Takashi , Kitao Teijiro
Published: July 2006

N,N′-1,3-Propano-bridged indigo was reduced by one electron to the semi-reduced radical when irradiated by visible light (λ > 500 nm) in a deaerated benzene solution containing triethylamine whereas N,N′-dimethylindigo and N,N′-diacetylindigo were reduced by two electrons to their leuco forms under the same reaction conditions.
AMPEROMETRIC GAS SENSOR USING SOLID STATE PROTON CONDUCTOR SENSITIVE TO HYDROGEN IN AIR AT ROOM TEMPERATURE
Authors: Miura Norio , Kato Hiroshi , Ozawa Yoshihiro , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

A new type of amperometric gas sensor using a proton conductor (antimonic acid) and its working mechanisms are proposed for detecting small amounts of H2 in air at room temperature. The short circuit current of the sensor cell was found to be proportional to the concentration of H2. It is also shown that the sensor could be modified into a simpler construction where the reference gas (air) is no longer necessary.
THE SYNTHESIS OF SILICON OXYNITRIDE FIBERS BY NITRIDATION OF POLYCARBOSILANE
Authors: Okamura Kiyohito , Sato Mitsuhiko , Hasegawa Yoshio , Amano Tadaaki
Published: July 2006

Silicon oxynitride fibers were synthesized by the reaction of polycarbosilane in NH3 gas. The fibers were in the amorphous state and transparent in visible light. The tensile strength and Young’s modulus of the fibers obtained at 1300 °C were 1.80±0.37 and 139±17 GPa, respectively
119Sn NMR SPECTROSCOPIC INVESTIGATION OF TETRABUTYLDISTANOXANES
Authors: Otera Junzo , Yano Toru , Nakashima Koji , Okawara Rokuro
Published: July 2006

119Sn FT NMR spectra proved to differentiate tin atoms in dimeric tetrabutyldistanoxanes successfully. Tentative assignment of 119Sn NMR spectra was achieved for the first time.
A CONVENIENT AND GENERAL SYNTHESIS OF ALKANE SULFINIC ACIDS
Authors: Ueno Yoshio , Kojima Akihiko , Okawara Makoto
Published: July 2006

2-(Alkylsulfonyl)benzothiazoles are reduced with sodium tetrahydroborate to give alkane sulfinic acids in good yield.
NEW QUASSINOID GLYCOSIDES AND HEMIACETALS FROM PICRASMA AILANTHOIDES PLANCHON. PICRASINOSIDE-B,-C,-D,-E,-F, AND -G, AND PICRASINOL-A AND -B
Authors: Okano Masayoshi , Fujita Tomoyuki , Fukamiya Narihiko , Aratani Takaaki
Published: July 2006

New quassinoid glucosides, picrasinoside-B,-C,-D,-E,-F, and -G, and quassinoid hemiacetals, picrasinol-A and -B, were isolated from the bark of Piorasma ailanthoides PLANCHON, and their structures are established by spectral analysis and chemical transformations.
EFFECT OF SOLVENT COMPOSITION ON ELECTROCHEMICAL SPECTRAL SENSITIZATION AT THE SnO2/RHODAMINE B INTERFACE
Authors: Nakao Masashi , Watanabe Tadashi , Honda Kenichi
Published: July 2006

The anodic sensitized photocurrent at a SnO2 electrode in contact with a dye-containing acetonitrile-water mixed electrolyte solution depends remarkably on the solvent composition, due to a change in the adsorption behavior of the dye.
HYDROXYDICTYODIAL, A NEW ANTIFEEDANT DITERPENE FROM THE BROWN ALGA DICTYOTA SPINULOSA
Authors: Tanaka Jun’ichi , Higa Tatsuo
Published: July 2006

Hydroxydictyodial, an antifeedant diterpene and a key intermediate in the biogenesis of several related diterpenes, has been isolated from the brown alga Dictyota spinulosa, and its structure was determined by spectroscopic analysis and chemical transformation.
2-BENZYLOXY-1-PROPENE: A NOVEL PROTECTIVE REAGENT OF HYDROXYL GROUPS
Authors: Mukaiyama Teruaki , Ohshima Masahiro , Murakami Masahiro
Published: July 2006

Hydroxyl compounds are easily protected on treatment with 2-benzyloxy-1-propene, a novel hydroxyl protective reagent, in the presence of a catalytic amount of dichloro(1,5-cyclooctadiene)palladium (II). The deprotection to regenerate the parent hydroxyl compounds is also readily carried out by catalytic hydrogenation under neutral conditions.
A FORMAL TOTAL SYNTHESIS OF POLYOXIN J USING 4-O-BENZYL-2,3-O-ISOPROPYLIDENE-l-THREOSE AS A COMMON CHIRAL BUILDING BLOCK
Authors: Tabusa Fujio , Yamada Tohru , Suzuki Keisuke , Mukaiyama Teruaki
Published: July 2006

A convergent formal total synthesis of Polyoxin J was achieved. Two fragments, deoxypolyoxin C and 5-O-carbamoylpolyoxamic acid, were synthesized in a highly stereoselective manner from the common chiral building block, 4-O-benzyl-2,3-O-isopropylidene-l-threose, finishing the formal synthesis of Polyoxin J.
STEREOSELECTIVE SYNTHESIS OF α-RIBONUCLEOSIDES FROM 1-HYDROXY SUGARS BY USING 2-FLUOROPYRIDINIUM TOSYLATE
Authors: Mukaiyama Teruaki , Hashimoto Yukihiko , Hayashi Yujiro , Shoda Shin-ichiro
Published: July 2006

A novel method for the preparation of α-ribonucleosides was developed by the use of 2-fluoro-1-methylpyridinium tosylate as a condensing reagent. Various α-ribonucleosides were synthesized from 1-hydroxy sugars and trimethylsilylated nitrogen compounds, such as nucleoside bases and azide, in good yields under mild conditions.
OXIDATION OF AZULENE DERIVATIVES. AUTOXIDATION OF GUAIAZULENE IN A POLAR APROTIC SOLVENT
Authors: Nozoe Tetsuo , Takekuma Shin-ichi , Doi Masashi , Matsubara Yoshiharu , Yamamoto Hiroshi
Published: July 2006

Autoxidation of guaiazulene at 100 °C in N,N-dimethylformamide afforded twenty-three separable products including seven known compounds. Most of these new compounds possess highly interesting structures of azulenoquinone, inden-1-one, benzocyclobutadiene, naphthoquinone, and dimeric forms.
PREDICTION OF ROTAMERIC PREFERENCES IN 9-(1-METHOXYETHYL)TRIPTYCENE DERIVATIVES BY MOLECULAR FORCE FIELD CALCULATIONS
Authors: Abe Kazuhisa , Hirota Minoru , Yamamoto Gaku , Oki Michnori
Published: July 2006

The rotamer distributions and the optimized geometries of peri-substituted 9-(1-methoxyethyl)triptycene derivatives were determined by means of molecular force-field calculations (MM2). The results agreed well with those from the NMR experiments except for the derivative containing the intramolecular hydrogen bonding.
STRUCTURE OF TWO STRESS METABOLITES, SPIROBROUSSONIN A AND B, FROM DISEASED PAPER MULBERRY
Authors: Takasugi Mitsuo , Niino Nobuyuki , Anetai Masaki , Masamune Tadashi , Shirata Akira , Takahashi Kokichi
Published: July 2006

The fungus-inoculated Broussonetia papyrifera shoot cortical tissues produced two stress metabolites named spirobroussonin A and B. Structure elucidation of these compounds is described.
CLEAVAGE OF METHYLTHIOMETHYL ETHERS BY ELECTROLYTIC PROCEDURE
Authors: Mandai Tadakatsu , Yasunaga Hiroyasu , Kawada Mikio , Otera Junzo
Published: July 2006

An electrolytic method for deblocking a methylthiomethyl group is newly developed.