bluuebunny/crossref_metadata_2025_split huggingface dataset:
COPPER(I)-PROMOTED COUPLING REACTION OF ARYL HALIDES WITH SODIUM DIETHYLMALONATE
Authors: Setsune Jun-ichiro , Matsukawa Kimihiro , Wakemoto Hirofumi , Kitao Teijiro 
Published: July 2006

Abstract
Copper(I)-promoted coupling reaction of aryl halides with sodium diethylmalonate occurred smoothly in dioxane. The qualitative trends in the activity of copper(I) salt followed the order: CuBr &gt; CuI &gt; CuBF4(CH3CN)4 &gt; CuCl. The activity was lowered in the presence of coordinating molecule such as acetonitrile, pyridine, NaI, phosphine, and sulfide. The reaction was generally applicable to aryl halides with various substituents.
SYNTHESES OF 1,2,3,6-TETRAHYDROBENZOCYCLOBUTENE-3,6-DIONES
Authors: Oda Masaji , Kanao Yoshinori 
Published: July 2006

Abstract
Parent 1,2,3,6-tetrahydrobenzocyclobutene-3,6-dione and its simple derivatives were first synthesized by oxidation of bicyclo[4.2.0]octane-2,5-diones in either one-step or stepwise manner.
LATTICE CONSTANT OF HYDRODYNAMIC DISSIPATIVE STRUCTURE
Authors: Aikawa Yoshihiro , Sukigara Mitsunori 
Published: July 2006

Abstract
The lattice constant of two dimentional hexagonal lattice appeared in the hydrodynamic dissipative structure of liquid layer is calculated from a viewpoint of thermodynamics. This calculation method is a rather general one which should be available for the Benard problem and the Felici instability. The axial ratio of the convective unit cell, γ, is calculated to be γ=31⁄4/2 = 0.658.
(3,4-DIMETHYLENE-1,5-CYCLOHEPTADIENE)TRICARBONYLIRON
Authors: Oda Mitsunori , Morita Noboru , Asao Toyonobu 
Published: July 2006

Abstract
Title compound was obtained by the reaction of 3,4-bisbromomethyl-1,3,5-cycloheptatriene with enneacarbonyldiiron, and quenching of an anion formed from the complex and n-butyl lithium with electrophiles afforded 1,6,7,8-tetrahapto(heptafulvene)tricarbonyliron derivatives.
REGIOSPECIFIC CYCLIZATION OF N-BENZOYL-N-METHOXYMETHYL-1-METHYL-α,β-DEHYDROTRYPTOPHAN METHYL ESTER TO A 5,6-DIHYDROAZEPINO[5,4,3-cd]INDOLE DERIVATIVE. A NEW METHOD FOR INTRODUCING SUBSTITUENTS ONTO THE 4-POSITION OF INDOLE NUCLEUS
Authors: Nakatsuka Shin-ichi , Miyazaki Hideki , Goto Toshio 
Published: July 2006

Abstract
A novel cyclization of the N-protected dehydrotryptophan 7 at the 4-position was achieved in excellent yield. Selective hydrogenation of the cyclized compound 10 gave the 3,4,5,6-tetrahydroazepinoindole derivative 11, which contains the same ring system as clavicipitic acid (12)
POLYMERIZATION, OXYGENATION AND ISOMERIZATION OF ISOCYANIDES UNDER IRRADIATION
Authors: Boyer Joseph H , Ramakrishnan V T , Srinivasan K G , Spak A J 
Published: July 2006

Abstract
Irradiation in the presence of triplet oxygen polymerized both 2,4-dimethyoxyphenyl and cyclohexyl isocyanide and photoautoxidized each into the corresponding isocyanate. The aryl, but not the alicyclic, isocyanide also photoisomerized into a cyanide. The consumption of an isocyanide was enhanced in the presence of certain aromatic hydrocarbons, e.g., naphthalene and phenanthrene, but was diminished in the presence of pyrene. Two bisisocyanides were unaffected by the presence of oxygen during irradiation.
COMMENT ON THE PAPER “SIMPLE EVALUATION OF ENANTIOMER-SELECTIVITY OF CROWN ETHER USING MEMBRANE ELECTRODE” BY Y. YASAKA ET AL.
Authors: Simon Wilhelm , Prelog Vladimir 
Published: July 2006

Abstract
In the paper mentioned in the title the authors describe the evaluation of enantiomer-selectivity of chiral crown ethers by measuring electrical potential differences on electrochemical cell assemblies with PVC membranes containing these chiral ionophores. Their communication gives the impression that the evaluation of enantiomer-selectivity of chiral ionophores by electrochemical methods, which were developed in our laboratory beginning 1966, is a novel one because they do not refer to our previous work. We would like to point out that we published our first paper on electrochemical detection of enantiomer-selectivity in 1975, and that several subsequent papers from our laboratory appeared since then not only in the primary and referring journals, but also in review articles.
THE EFFECTS OF SULPHUR IN A PALLADIUM SURFACE ON THE ADSORPTION AND DECOMPOSITION OF FORMIC ACID
Authors: Matsumoto Yoshio , Onishi Takaharu , Tamaru Kenzi 
Published: July 2006

Abstract
Ultraviolet photoelectron spectra indicate that formic acid is adsorbed as formate ion on not only clean, but sulphur segregated Pd surface with saturated amounts. The rate of formic acid decomposition stayed unchanged in the presence of surface sulphur.
MODIFICATION OF SUBSTITUENT EFFECT BY CYCLODEXTRIN COMPLEXATION IN ALKALINE HYDROLYSIS OF 7-SUBSTITUTED COUMARINS
Authors: Uekama Kaneto , Lin Chien-Li , Hirayama Fumitoshi , Otagiri Masaki , Takadate Akira , Goya Shujiro 
Published: July 2006

Abstract
The substituent effect in the alkaline hydrolysis of 7-substituted coumarins in the absence and presence of cyclodextrin (CyD) was analyzed by a modified Hammett equation (1). It was shown that the transmission route of the substituent effect to reaction site was altered by the inclusion of coumarin molecule within hydrophobic CyD cavity.
A KINETIC DETERMINATION OF NANOGRAM AMOUNTS OF VANADIUM BY ITS CATALYTIC EFFECT
Authors: Nakano Shigenori , Kasahara Eiji , Tanaka Masaya , Kawashima Takuji 
Published: July 2006

Abstract
A new method is proposed for the determination of vanadium(IV) and vanadium(V). The method is based on their catalytic effect on the reaction of N-phenyl-p-phenylenediamine with N,N-dimethylaniline to form a green compound (λmax=735 nm) in the presence of bromate. The method is highly sensitive with a Sandell sensitivity of 1.3×10−3 ng cm−2 and useful for the analysis of vanadium in sea water.
NEW SYNTHETIC METHOD OF [2.2]PARACYCLOPHANE, BENZOCYCLOBUTENE, AND LEPIDOPTERENE: PYROLYSIS OF ARYLMETHYL PHENYL SELENIDES
Authors: Higuchi Hiroyuki , Sakata Yoshiteru , Misumi Soichi , Otsubo Tetsuo , Ogura Fumio , Yamaguchi Hachiro 
Published: July 2006

Abstract
The flash vacuum pyrolysis of benzyl phenyl selenides gave bibenzyls and diphenyl diselenide in excellent yields. This type of reaction was successfully applied to the synthesis of the title compounds.
EVIDENCE FOR PHENYL BRIDGING IN BENZYLDIMETHYLGERMYL RADICALS BY ELECTRON SPIN RESONANCE
Authors: Mochida Kunio , Kira Mitsuo , Sakurai Hideki 
Published: July 2006

Abstract
Benzyldimethylgermyl radicals were observed by ESR for the first time in solution at low temperatures. The ESR parameters indicated partial bridging of the phenyl group to the germanium radical center in a preferred conformation.
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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 &lt;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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
Heteroaromatic N-oxides are easily deoxygenated with chlorotrimethylsilane/sodium iodide/zinc in acetonitrile to give the corresponding parent bases in good yields.
HYDROGEN EVOLUTION AT LaNi5 AND MmNi5 ELECTRODES IN ALKALINE SOLUTIONS
Authors: Kitamura Tohru , Iwakura Chiaki , Tamura Hideo 
Published: July 2006

Abstract
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.
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.