bluuebunny/crossref_metadata_2025 huggingface dataset:
6R-TYPE OF Ti2S3 SYNTHESIZED IN AN H2S–H2 ATMOSPHERE
Authors: Onoda Mitsuko , Saeki Masanobu
Published: July 2006

A new type of Ti2S3 was prepared by reducing TiS2 in an H2S–H2atmosphere at 600°C. The structure is proposed to be of 6R-type, being composed of cubic-close-packed sulfur layers as well as the fully and partially occupied titanium layers. The ordering of titanium vacancies was suggested.
CRYSTAL AND MOLECULAR STRUCTURE OF PALYTHENE POSSESSING A NOVEL 360 NM CHROMOPHORE
Authors: Uemura Daisuke , Katayama Chuji , Wada Akio , Hirata Yoshimasa
Published: July 2006

Crystal and molecular structure of palythene isolated from Palythoa tuberculosa (Coelenterata) was unambiguously determined by X-ray analysis including its absolute configuration. The structure of palythene was defined as an inner salt and then features of delocalization of the positive charge were elucidated.
CONVENIENT PREPARATION OF 1,2-CYCLOHEXANEDIONES
Authors: Utaka Masanori , Matsushita Seishiro , Takeda Akira
Published: July 2006

1,2-Cyclohexanedione and 3-alkyl-l,2-cyclohexanediones were prepared in good to excellent yields from the corresponding 2 ,6-dibromocyclohexanones by treatment with aqueous NaOH.
2,3-DIMETHYL-4-METHOXYBUTENOLIDES FROM RED ALGAE, COELOSEIRA PACIFICA AND AHNFELTIA PARADOXA
Authors: Nomura Yukihiro , Kusumi Takenori , Ishitsuka Midori , Kakisawa Hiroshi
Published: July 2006

Three new butenolide derivatives were isolated from the red algae, C. pacifica and A. paradoxa. The structures of these compounds were determined from their spectral properties, one of which was confirmed by synthesis.
SYNTHESIS AND CHIROPTICAL PROPERTIES OF AN OPTICALLY ACTIVE DOUBLY BRIDGED ALLENE. [8][10]SCREW[2]ENE
Authors: Nakazaki Masao , Yamamoto Koji , Maeda Miharu
Published: July 2006

The dichlorocyclopropane derivative 6 prepared from 5 was treated with (−)-sparteine modified butyllithium to afford (+)-(R)-[8][10] doubly bridged allene (4) whose absolute configuration was assigned by its CD analysis.
A NEW METHOD FOR ACYLATION OF ENOLATES BY MEANS OF DIALKYL ACYLPHOSPHONATES AS ACYLATING AGENTS
Authors: Sekine Mitsuo , Kume Akiko , Nakajima Masashi , Hata Tsujiaki
Published: July 2006

Acylations of various enolates by means of diethyl acylphosphonates were described. For the acylation of acetophenone, lithium bis(trimethylsilyl)amide (LSA) was found to be suitable as the base. The scope and limitation of the benzoylation using diethyl benzoylphosphonates were also described.
TWO NEW CLERODANE DITERPENOIDS FROM AJUGA REPTANS (LABIATAE)
Authors: Camps Francisco , Coll José , Cortel Adolfo
Published: July 2006

Ajugareptansone A and B, 2 and 3, two new neo-clerodane diterpenoids have been isolated from Ajuga reptans, and their structures have been elucidated by spectral methods and X-ray diffraction analysis. Under conditions used for isolation and purification of these compounds, formation of 3 from 2 has been observed.
A NOVEL TYPE OF BRIDGING OF THE β-DIKETONATE DIANIONS BETWEEN TWO PALLADIUM(II) ATOMS: η3-COORDINATION AND O,O′-CHELATION
Authors: Otani Yukie , Nakamura Yukio , Kawaguchi Shinichi , Okeya Seichi , Hinomoto Tetsu
Published: July 2006

Complexes of a novel type, [(PP)Pd(O,O′-β-dik(2–)-C1–C3)Pd(PP)](ClO4)2 containing dianions of acetylacetone and ethyl acetoacetate as a bridging ligand and diphosphines (PP) were prepared and characterized mainly by IR and 1H, 13C, and 31P NMR spectroscopy.
REDUCTIVE COUPLING OF BENZYLIC HALIDES BY CHLOROTRIS(TRIPHENYLPHOSPHINE)COBALT(I)
Authors: Yamada Yasuji , Momose Den-ichi
Published: July 2006

Chlorotris(triphenylphosphine)cobalt(I) is an effective agent for the reductive coupling of benzylic halides under mild and neutral conditions.
SPECTRAL CONTROL OF METHYL ORANGE AND CYANINE DYES BY SYNTHETIC BILAYER MEMBRANES
Authors: Nakashima Naotoshi , Fukushima Hiroshi , Kunitake Toyoki
Published: July 2006

Methyl Orange and cyanine dyes bound to aqueous ammonium bilayer membranes undergo extensive spectral changes which are sensitive to membrane fluidity and small structural changes of the component amphiphile.
NEW POLY- AND BIS(12-CROWN-4)S POSSESSING HIGH SODIUM-SELECTIVITY
Authors: Maeda Takumi , Ouchi Mikio , Kimura Keiichi , Shono Toshiyuki
Published: July 2006

New poly- and bis(crown ether)s containing 12-crown-4 moieties were synthesized. Solvent extraction data suggested that poly(crown ether) and bis(crown ether) derived from acryloyl chloride and malonyl chloride, respectively, have much larger extractability and selectivity for Na+ than bis(crown ether) derived from glutaryl chloride and monocyclic analog.
SHINJUDILACTONE, A NEW BITTER PRINCIPLE FROM AILANTHUS ALTISSIMA SWINGLE
Authors: Ishibashi Masami , Murae Tatsushi , Hirota Hiroshi , Naora Hirokazu , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi
Published: July 2006

Shinjudilactone, a new bitter principle with a new 13 [12→11α]abeo-picrasane skeletone, was isolated from root bark of Ailanthus altissima SWINGLE and the structure was determined.
SYNTHESIS OF ESTERS FROM ACETIC ACID WITH METHANOL, ETHANOL, PROPANOL, BUTANOL, AND ISOBUTYL ALCOHOL CATALYZED BY SOLID SUPERACID1
Authors: Hino Makoto , Arata Kazushi
Published: July 2006

A solid superacid catalyst, which was obtained by exposing Zr(OH)4 to IN H2SO4 and then calcining in air at 500–750°C, was found to be highly active for the heterogeneous title reactions at 30–45°C. The reactions with the used catalyst gave identical results with those using freshly activated catalyst.
A CONVENIENT PREPARATION OF SULPHINIC ESTERS FROM SULPHINYL CHLORIDES AND CHLOROSULPHITES USING HEXAMETHYLDISILOXANE AS CHLORIDE ANION ACCEPTOR
Authors: Drabowicz Jozef
Published: July 2006

Sulphinic esters can be obtained in high yields by the reaction of sulphinyl chlorides with chlorosulphites in the presence of hexamethyldisiloxane and catalytic amount of dimethyl sulphoxide.
A CONVENIENT METHOD FOR THE DIRECT PREPARATION OF KETONES FROM 2-(6-(2-METHOXYETHYL)PYRIDYL)CARBOXYLATES AND ALKYL IODIDES BY USE OF ZINC DUST AND A CATALYTIC AMOUNT OF NICKEL DICHLORIDE
Authors: Onaka Makoto , Matsuoka Yoshio , Mukaiyama Teruaki
Published: July 2006

Treatment of 2-(6-(2-methoxyethyl)pyridyl) carboxylates with alkyl iodides in the presence of zinc dust and a catalytic amount of NiCl2 in DMF at 50 °C affords unsymmetrical ketones in good yields by a one-pot procedure.
PEPTIDE SYNTHESIS BY USING PHENYLPHOSPHONIC ESTER AS A COUPLING REAGENT
Authors: Watanabe Yutaka , Morito Naoya , Kamekawa Ken-ichi , Mukaiyama Teruaki
Published: July 2006

Synthesis of peptides containing various functions was efficiently accomplished by treatment of the tetrabutylammonium salts of N-protected amino acids (or peptides) with amino acid esters in the presence of bis(o- or p-nitrophenyl) phenylphosphonate. Synthesis of leucine-enkephalin was successfully achieved by the above method employing a (3+2) or (4+1) fragment coupling approach.
SYNTHESIS OF (±)-NORAMBREINOLIDE BY CYCLIZATION OF TRANS-β-MONOCYCLOHOMOFARNESIC ACID
Authors: Saito Akira , Matsushita Hajime , Tsujino Yasuko , Kaneko Hajime
Published: July 2006

Synthesis of norambreinolide by acid-catalized cyclization of trans-β-monocyclohomofarnesic acid was studied. From the acid norambreinolide was obtained in 57 per cent yield by catalysis of stannic chloride in dichloromethane at −78°C. Isomerization of norambreinolide to norisoambreinolide was observed with a rise of reaction temperature in the presence of stannic chloride.
COLLOIDAL PLATINUM CATALYST FOR LIGHT-INDUCED HYDROGEN EVOLUTION FROM WATER. A PARTICLE SIZE EFFECT
Authors: Toshima Naoki , Kuriyama Masaki , Yamada Yutaka , Hirai Hidefumi
Published: July 2006

Well-dispersed fine and stable colloidal platinum is easily prepared by refluxing the solution of chloroplatinic acid in alcohol (and water) in the presence of poly(vinyl alcohol) or polyvinylpyrrolidone under air. The catalytic activity of the colloidal platinum for light-induced hydrogen evolution from water depends on the particle size of the platinum indicating the maximum activity for the colloid of about 30 Å in diameter.
SYNTHESIS AND PROPERTIES OF 7-(1,3-DITHIOL-2-YLIDENE)-3,5-CYCLOHEPTADIENE-1,2-DIONE (OR 7,10-DITHIASESQUIFULVALENE-1,2-QUINONE) DERIVATIVES
Authors: Takahashi Kazuko , Takase Kahei , Noda Yoshihiko
Published: July 2006

Three stable 4-tert-butyl, 5-bromo, and 3,5-dibromo derivatives of 7,10-dithiasesquifulvalene-1,2-quinone (or o-tropoquinone dithiolide) were synthesized and their physical and chemical properties were discussed on the basis of their spectroscopic data and the frontier electron density distribution, a stabilizing (reactivity-lowering) effect of the sulfur atoms on these compounds being well displayed in the density distribution.
ALCOHOL FORMATION IN CO HYDROGENATION OVER SUPPORTED RHENIUM
Authors: Tsunoda Takashi , Ogasawara Hiroaki , Komiyama Masaharu , Ozawa Sentaro , Ogino Yoshisada
Published: July 2006

Rhenium supported on CeO2, TiO2 or ZrO2 showed high catalytic activity for CO hydrogenation and was found to produce sizable amount of alcohols along with hydrocarbons. The effects of catalyst support, reaction pressure and reaction temperature on the total conversion and the product distribution were examined.
PALLADIUM CATALYZED REACTION OF HEXABUTYLDITIN WITH ARYL BROMIDES: PREPARATION OF NEGATIVELY SUBSTITUTED ARYLTRIBUTYLTIN
Authors: Kosugi Masanori , Shimizu Kohji , Ohtani Atsushi , Migita Toshihiko
Published: July 2006

Reaction of hexabutylditin with aryl bromides in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium was found to be a promising tool to prepare aryltributyltins, particularly negatively substituted (–NO2, –COMe, –CN) phenyltin compounds.
HYDROGEN–DEUTERIUM INVERSE ISOTOPE EFFECT MEASURED FOR THE C–O BOND DISSOCIATION PROCESS IN THE METHANATION ON SUPPORTED NICKEL CATALYSTS
Authors: Mori Toshiaki , Masuda Hiroyuki , Imai Hisao , Miyamoto Akira , Baba Shigeo , Murakami Yuichi
Published: July 2006

A hydrogen–deuterium inverse isotope effect was found for the C–O bond dissociation process in the methanation of adsorbed CO on a Ni catalyst using a pulse technique; the average value of kH/kD was 0.75. Such an effect (0.77) was also found for the steady-state reaction of the CO methanation. It was shown that the adsorbed CO molecule is partially hydrogenated before the C–O bond dissociation.
HIGHLY EFFICIENT VALENCE ISOMERIZATION BETWEEN NORBORNADIENE AND QUADRICYCLANE DERIVATIVES UNDER SUNLIGHT
Authors: Maruyama Kazuhiro , Terada Kazutoshi , Yamamoto Yoshinori
Published: July 2006

3-Phenylcarbamoyl-2,5-norbornadiene-2-carboxylic acid (1b) undergoes a facile and quantitative isomerization into the corresponding quadricyclane derivative (2b) under sunlight. The back isomerization of 2b to 1b proceeds quantitatively by the use of catalytic amounts of Rh2(CO)4Cl2.
OPTICAL RESOLUTION OF 3-endo-BENZAMIDO-5-NORBORNENE-2-endo-CARBOXYLIC ACID AND ITS APPLICATION AS A NEW RESOLVING AGENT
Authors: Saigo Kazuhiko , Okuda Yoshiyuki , Wakabayashi Sumio , Hoshiko Tomonori , Nohira Hiroyuki
Published: July 2006

3-endo-Benzamido-5-norbornene-2-endo-carboxylic acid was synthesized from 5-norbornene-2-endo,3-endo-dicarboxylic anhydride in one pot and easily resolved into a pair of optically active forms by preferential crystallization of its dibenzylamine salt. The optically active acid was successfully applied to the optical resolution of (±)-ephedrine as a new resolving agent.
GEOMETRICAL ISOMERISM OF COBALT(III) COMPLEXES WITH MULTIDENTATE THIOLATO LIGANDS
Authors: Yamanari Kazuaki , Takeshita Norimatsu , Komorita Takashi , Shimura Yoichi
Published: July 2006

Two complexes of [Co(amine)4(thiolato)2] type were newly prepared and separated into two isomers each by a column chromatography. The geometrical configurations of the isomers were assigned mainly on the basis of their 13C-NMR and ultraviolet absorption spectra. The sulfur-to-metal charge transfer band of trans(S) isomer appears at lower energy than that of cis(S) isomer.
SYNTHESIS OF PYRROLE DERIVATIVES VIA DEOXYGENATION OF 4H-1,2-OXAZINES BY IRON CARBONYLS
Authors: Nakanishi Saburo , Shirai Yoshihiro , Takahashi Kenji , Otsuji Yoshio
Published: July 2006

The reaction of 5,6-dihydro-4H-1,2-oxazines, which are derived from α-bromooximes and enamines, with iron carbonyl complexes such as Fe3(CO)12 and (C2H5)3NH[HFe3(CO)11] gives pyrrole derivatives in high yields, accompaning deoxygenation from the oxazines. The pyrroles are also obtained by an one-pot reaction using α-bromooximes, enamines and iron carbonyls.
SYNTHESIS OF AVENIC ACID A AND 2′-DEOXYMUGINEIC ACID, AMINO ACIDS POSSESSING AN IRON CHELATING ACTIVITY
Authors: Fushiya Shinji , Sato Yoshikazu , Nakatsuyama Shuichi , Kanuma Norio , Nozoe Shigeo
Published: July 2006

Avenic acid A (1), an amino acid derivative possessing an iron chelating activity and excreted from the root of Avena sativa L. was synthesized in optically active form by successive reductive coupling of protected l-aspartic β-semialdehyde and l-malic semialdehyde with l-homoserine lactone. 2′-Deoxymugineic acid (2), a related substance was also synthesized by the same method by which the stereostructure of this amino acid derivative was proved to be 2(S),3′(S),3″(S)-N-[3-(3-hydroxy-3-carboxypropylamino)-3-carboxypropyl]-azetidine-2-carboxylic acid.
AUTORECYCLING OXIDATION OF ALCOHOL CATALYZED BY PYRIMIDOPTERIDINES AS A FLAVIN MODEL
Authors: Nagamatsu Tomohisa , Matsumoto Etsuko , Yoneda Fumio
Published: July 2006

10-Substituted pyrimido [5,4-g] pteridines (II) were prepared by the condensation of 6-alkylamino-5-nitrosouracils (IV) with appropriate 6-chlorouracils. The compounds II oxidized cyclopentanol under neutral conditions to yield cyclopentanone and a remarkable autorecycling in the oxidation was observed.
DINITROGEN FIXATION CATALYZED BY THE REDUCED SPECIES OF [Fe4S4(SPh)4]2− AND [Mo2Fe6S8(SPh)9]3−
Authors: Tanaka Koji , Hozumi Yoshiyuki , Tanaka Toshio
Published: July 2006

Dinitrogen can be reduced to NH3 under the condition of controlled potential electrolyses in the presence of [Fe4S4(SPh)4]2− or [Mo2Fe6S8(SPh)9]3− in MeOH/THF or in H2O. The maximum current efficiency in the electrochemical reduction is 1.6 % for the reduction of N2 in MeOH/THF and the total yield of NH3 based on the cluster is 195 % for 4 d.
ACTION OF HETEROPOLY ACID AND RELATED OXIDES IN ACYLATION OF CHLOROBENZENE WITH O-CHLOROBENZOYL CHLORIDE
Authors: Yamaguchi Tsutomu , Mitoh Akimi , Tanabe Kozo
Published: July 2006

Heteropoly acids, MoO3, and calcined FeSO4 have been found to catalyze the acylation of chlorobenzene with O-chlorobenzoyl chloride. A kinetic study revealed that those catalysts are not active in their original forms, but the metal chlorides or metal complexes formed by reacting with chlorine are active for the acylation reaction.
STEREOSELECTIVE ACYCLIC SYNTHESIS VIA ALLYLMETALS: AN EFFICIENT SYNTHESIS OF (±)-4-METHYLHEPTAN-3-OL, AN AGGREGATION PHEROMONE OF THE SMALLER EUROPEAN ELM BARK BEETLE
Authors: Koreeda Masato , Tanaka Yoshio
Published: July 2006

A highly effiecient, stereoselective synthesis of the insect pheromone (±)-4-methylheptan-3-ol, 4 steps from 1,3-pentadiene with an overall yield of 69.3%, has been achieved using a Lewis-acid catalyzed addition reaction of an allyltin and propanal.
STEREOSELECTIVE ACYCLIC SYNTHESIS VIA ALLYLMETALS: STRUCTURAL DEPENDENCE IN A LEWIS-ACID CATALYZED ADDITION OF ALLYLTINS TO ALDEHYDES
Authors: Koreeda Masato , Tanaka Yoshio
Published: July 2006

Lewis-acid catalyzed reaction of allyltins with aldehydes at −78 °C provide homoallyl alcohols with high stereoselectivity; 2-alkenyltins in general provide erythro adducts preferentially with an erythro/threo ratio greater than 12/1, whereas only threo adducts can be obtained from E-cinnamyltins.
BITTER PRINCIPLES OF VIBURNUM SUSPENSUM
Authors: Hase Tsunao , Iwagawa Tetsuo
Published: July 2006

Two bitter principles isolated from Viburnum suspensum have been determined to be a new iridoid glucoside (1) and its aglucone (2) by spectroscopic and chemical methods.
SELECTIVE HYDROGENATION OF CARBON MONOXIDE ON SUPPORTED Rh CATALYSTS PREREDUCED IN SITU WITH H2O AND CO OR H2
Authors: Iwasawa Yasuhiro , Hayasaka Toshiaki , Ogasawara Sadao
Published: July 2006

Carbon monoxide was selectively converted to ethylene and propylene(>80 % of C1–C6 hydrocarbons produced) at 433–447 K over SiO2-supported Rh catalysts prereduced in situ with a CO–H2O mixture, while another Rh catalyst obtained by the pretreatment in situ with a H2–H2O mixture yielded ethanol and acetaldehyde at a higher selectivity by a factor of about 100 at 453 K than a usual Rh(O) catalyst reduced with H2 alone.
GELATINE MEMBRANE ELECTRODE SENSITIVE TO ALKALINE EARTH METAL IONS IN DIMETHYL SULFOXIDE
Authors: Nakamura Toshio , Morozumi Sumiko , Izutsu Kosuke
Published: July 2006

A gelatine membrane electrode coated on a copper disk was found to respond in DMSO in a Nernstian way to the activities of magnesium and calcium ions and in a near-Nernstian way to that of barium ion. The approximate selectivity coefficients for the magnesium and barium ions vs. the calcium ion were 0.4 and 0.7, respectively. The electrode also responded linearly to paZn2+ and paCu2+, but with slopes larger than the Nernstian one.
SYNTHESIS OF OPTICALLY ACTIVE N-[(N-ACETYL)-α-AMINOACYL]-β-AMINO ALCOHOLS BY HOMOGENEOUS AND HETEROGENEOUS ASYMMETRIC HYDROGENATIONS
Authors: Ojima Iwao , Yatabe Momoko
Published: July 2006

Asymmetric hydrogenations of N-(N-acetyldehydrophenylalanyl)-β-amino alcohol benzyl ethers were carried out by using either rhodium complexes with chiral and achiral phosphines or 10% palladium on carbon. The effects of the chiral center in the β-amino alcohol moiety on simple as well as double asymmetric induction are described.
APPLICATIONS OF THE TANDEM [2,3]-WITTIG-OXY-COPE REARRANGEMENT TO SYNTHESES OF exo-BREVICOMIN AND OXOCRINOL. THE SCOPE AND LIMITATION OF THE SIGMATROPIC SEQUENCES AS A SYNTHETIC METHOD FOR δ,ε-UNSATURATED KETONES
Authors: Mikami Koichi , Nakai Takeshi
Published: July 2006

The synthetic utility of the title sigmatropic sequence is illustrated in the syntheses of E-6-nonen-2-one, a precursor of exo-brevicomin, and oxocrinol. The scope and limitation of this sequence as a synthetic method for δ,ε-unsaturated ketones are also discussed.
NOVEL REACTION OF 2-METHYLENEBENZOTHIAZOLINES WITH 3-(2, 3-DIPHENYL-2-CYCLOPROPENYLIDENE)PENTANE-2,4-DIONE: FORMATION OF 3a,9-DIHYDROCYCLOPENTA[b] [1,4]BENZOTHIAZINES
Authors: Tsuge Otohlko , Tanaka Minorus , Shimoharada Hiroshi , Kanemasa Shuji
Published: July 2006

Reactions of 3-substituted 2-methylenebenzothiazolines, generated in situ from the corresponding 2-methylbenzothiazolium salts and triethylamine, with 3-(2,3-diphenyl-2-cyclopropenylidene)pentane-2,4-dione give 3a,9-dihydrocyclopenta[b][1,4]benzothiazine derivatives.
AN EFFICIENT DOUBLE CHLORINATION OF OLEFINS BY tert-BUTYL HYPOCHLORITE
Authors: Sato Wataru , Ikeda Nobuo , Yamamoto Hisashi
Published: July 2006

Allylie dichlorides can be prepared regioselectively and in good yields from simple olefins by tert-butyl hypochlorite in the presence of silica gel.
PROMOTING EFFECT OF BaO ON THE ACTIVITY OF Ni/Al2O3 CATALYST FOR THE HYDROGENATION OF BENZENE AND TOLUENE
Authors: Fujie Hirokazu , Mori Kenji , Tamura Kouji , Okada Sanae , Matsuoka Seiichi , Matsuoka Hiroo
Published: July 2006

The catalytic activity of Ni/Al2O3 for the hydrogenation of benzene and toluene is remarkably enhanced by introduction of a small amount of BaO and the highest activity is obtained with 1.5 wt% BaO. The hydrogenation activity is proportional to the amount of hydrogen chemisorbed on the catalyst and the introduction of BaO into Ni/Al2O3 increases Ni metal surface area.
LEWIS ACID CATALYSED PINACOL REARRANGEMENT–A SHORT SYNTHESIS OF KARAHANAENONE
Authors: Bhushan Vidya , Chandrasekaran Srinivasan
Published: July 2006

The pinacolic coupling reaction has been effectively used to prepare the unsymmetrical pinacol 2 and this key intermediate underwent a smooth ring enlargement to the monoterpene karahanaenone 3, an odoriferous constituent of Japanese hop and Cypress oil.
THE CYANATION OF VINYL HALIDES CATALYZED BY NICKEL(0) COMPLEX GENERATED IN SITU
Authors: Sakakibara Yasumasa , Yadani Nobuichi , Ibuki Ichiro , Sakai Mutsuji , Uchino Norito
Published: July 2006

Nickel(0) species generated in situ from NiBr2(PPh3)2–Zn–PPh3catalyzed the formation of unsaturated nitriles from vinyl halides and potassium cyanide. The reaction proceeded under very mild conditions and was stereoselective.
REDUCTION OF ORGANIC COMPOUNDS WITH LOW-VALENT NIOBIUM (NbCl5/NaAlH4)
Authors: Sato Mitsuyoshi , Oshima Koichiro
Published: July 2006

Carbonyl compounds have been deoxygenatively dimerized to alkenes with the title reagent. Deoxygenation of epoxides to alkenes, reductive coupling of allylic and benzylic alcohols to hydrocarbons, and reduction of alkynes to alkenes are also described.
FUNCTION OF AMIDE GROUP IN SYNTHETIC MULTIDENTATES ON COMPLEXATION TOWARD ALKALI AND ALKALINE EARTH METAL CATIONS
Authors: Nakatsuji Yohji , Kobayashi Hirofumi , Okahara Mitsuo , Matsushima Kenji
Published: July 2006

Several macrocyclic multidentates having one amide group were newly prepared and their complexation property toward Na+, K+, Ca2+, and Ba2+ was examined by the extraction method. The affinity toward Ca2+ was observed and the orientation of the amide group toward the cation was suggested to be important for the molecular design of ligands.
STEREOSELECTIVE SYNTHESIS OF CIS-α,β-EPOXYKETONES VIA DIVALENT TIN ENOLATE
Authors: Mukaiyama Teruaki , Haga Toru , Iwasawa Nobuharu
Published: July 2006

A convenient method for the stereoselective synthesis of cis-β-substituted-α,β-epoxyketone is established employing Sn(OTf)2 mediated cross aldol reaction between α-bromoketone and aldehyde followed by successive treatment of the adduct with KF-dicyclohexyl-18-crown-6.
BIOGENETIC-LIKE BACKBONE REARRANGEMENT. A FORMATION OP D:C-FRIEDOBACCHAR-9(11)-ENE-3β,18β-DIYL LIACETATE FROM 13β,18β-EPOXYBACCHARAN-3β-YL ACETATE
Authors: Suemura Koji , Irokawa Tomomi , Tori Motoo , Ohta Shinya , Moriyama Yoshihiko , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi
Published: July 2006

13β,18β-Epoxybaccharan-3β-yl acetate was treated with BF3·Et2O in acetic anhydride to yield a complex mixture, in which the presence of D:C-friedobacchar-9(11)-ene-3β,18β-diyl diacetate (2) was shown; the product (2) was converted into 18-oxo-D:C-friedobacchar-9(11)-en-3β-yl acetate, the structure of which was confirmed by X-ray diffraction analysis.
A CONVENIENT METHOD FOR THE STEREOSPECIFIC SYNTHESIS OF (E)-3-ALKEN-1-OLS UTILIZING THE RING-OPENING REACTION OF 2,3-DIHYDROFURAN WITH ORGANOCUPRATES
Authors: Fujisawa Tamotsu , Kurita Yoshitsugu , Kawashima Masatoshi , Sato Toshio
Published: July 2006

(E)-3-Alken-1-ols were stereospecifically synthesized in good yields utilizing the regioselective nucleophilic ring-opening reaction of 2,3-dihydrofuran with several kinds of organocuprates under mild conditions.
SIMULTANEOUS EVOLUTION OF HYDROGEN AND OXYGEN BY WATER PHOTOLYSIS WITH PRUSSIAN BLUE AND TRIS(2,2′-BIPYRIDYL)RUTHENIUM(II) COMPLEX
Authors: Kaneko Masao , Takabayashi Naoki , Yamada Akira
Published: July 2006

Simultaneous evolution of hydrogen and oxygen gases was achieved by visible light irradiation of water containig prussian blue and tris(2,2′-bipyridyl)ruthenium(II) complex. The gases evolved were analyzed by gas chromatography and mass spectroscopy. The mechanism for the water photolysis was also discussed.
SYNTHESIS OF (Ba,Pb)TiO3 SOLID SOLUTION HAVING NO COMPOSITIONAL FLUCTUATION
Authors: Kakegawa Kazuyuki , Mohri Jun-ichi , Ishiguro Hiroyuki , Takahashi Koichiro , Shirasaki Shin-ichi
Published: July 2006

A solid solution of (Ba,Pb)TiO3 without compositional fluctuation has not been obtained by an ordinary solid-solid reaction of BaCO3, PbO and TiO2. This was confirmed through the measurements of Δd/d using X-ray diffraction. A new method of preparing (Ba,Pb)TiO3 without compositional fluctuation was developed.
CONVERSION OF METHANOL OVER METAL ION EXCHANGED FORMS OF FLUOR TETRA SILISIC MICA
Authors: Morikawa Yutaka , Goto Tadatoshi , Moro-Oka Yoshihiko , Ikawa Tsuneo
Published: July 2006

The catalytic activities of metal ion exchanged form of fluor tetra silisic mica (Me-TSM) were tested for the conversion of methanol. Although Na- and H-TSM have no activities, some Me-TSM’s show characteristic activities. Ti-TSM exclusively catalyzes the dehydration reaction like an acid catalyst. Cu-TSM dehydrogenates methanol to produce methyl formate selectively.
CHEMILUMINESCENT DETERMINATION OF TRACES OF COPPER(II) BY FLOW INJECTION METHOD
Authors: Yamada Masaaki , Suzuki Shigetaka
Published: July 2006

Chemiluminescence in conjunction with flow injection analysis is described for the determination of traces of copper(II) by means of the flavin mononucleotide-hydrogen peroxide-phosphate buffer system. This permits the determination of copper (II) more selectively than any other chemiluminescent system with a detection limit of 30 pg.
HIGH PERFORMANCE LIQUID CHROMATOGRAPHY OF POTENTIAL ANTITUMOR PLATINUM(II) COMPLEXES OF 1R,2R-CYCLOHEXANEDIAMINE
Authors: Noji Masahide , Achiwa Kyoko , Kondo Asami , Kidani Yoshinori
Published: July 2006

High performance liquid chromatography of antitumor Pt(II) complexes of 1R,2R-cyclohexandiamine, as well as cis- and trans-DDP, dichlorodiammineplatinum(II), has been performed, using a Toyo Soda G1000PW column, eluting with 0.1 mol dm−3 Na2SO4, and various Pt(II) complexes were separated successfully.
A NEW METHOD FOR THE SPECTROPHOTOMETRIC DETERMINATION OF Li(I) WITH A “CROWNED” DINITROPHENYLAZOPHENOL
Authors: Nakashima Kenichiro , Nakatsuji Shin’ichi , Akiyama Shuzo , Kaneda Takahiro , Misumi Soichi
Published: July 2006

A new method for the spectrophotometric determination of Li(I) with a “crowned” dinitrophenylazophenol is proposed, with a range between 25 and 250 ppb of Li(I) in chloroform-dimethylsulfoxide-triethylamine. The method shows both an excellent sensitivity and a fairly good selectivity, and is applied satisfactorily for the analysis of commercial preparations, e.g., lithium carbonate (tablet).
ROTATIONAL ISOMERISM ABOUT SILICON-TO-CARBON SINGLE BONDS
Authors: Nakamura Nobuo , Kohno Motomichi , Oki Michinori
Published: July 2006

1H NMR spectra of the adducts of 9-trimethylsilylanthracene with dimethyl acetylenedicarboxylate and p-quinone are temperature dependent, indicating slow rotation about silicon-to-carbon single bonds, while that of 1,4-dimethoxy-9-trimethylsilyltriptycene is indicative of completely frozen conformation with respect to the Si–C(9) bond.
ANTHRA[1,9-cd:4,10-c′d′]BIS[1,2]DISELENOLE, A NEW ELECTRON DONOR MOLECULE
Authors: Ohnishi Shigeo , Nogami Takashi , Mikawa Hiroshi
Published: July 2006

A new electron donor molecule, anthra[1,9-cd:4,10-c′d’]bis[1,2]diselenole, was synthesized. The charge-transfer complex formed between the donor and TCNQ showed the electrical conductivity of 1 (Ω cm)−1 for a compressed pellet sample.
GENERATION AND TRAPPING OF TETRAMETHYLDIGERMENE
Authors: Sakurai Hideki , Nakadaira Yasuhiro , Tobita Hiromi
Published: July 2006

Tetramethyldigermene, generated for the first time by pyrolysis of 1,4-diphenyl-2,3-benzo-7,7,8,8-tetramethyl-7,8-digermabicyclo[2.2.2]octadiene, was successfully trapped by [4+2] cycloaddition with anthracene and 1,1-dimethyl-2,5-diphenyl-1-silacyclopentadiene.
A SIMPLE ENANTIOSELECTIVE SYNTHESIS OF BOTH ENANTIOMERS OF SULCATOL USING A SINGLE CHIRAL PRECURSOR
Authors: Takano Seiichi , Goto Emiko , Ogasawara Kunio
Published: July 2006

A simple synthesis of (R)-(−)- and (S)-(+)-sulcatol(1), both the aggregation pheromone of Gnathotrichus sulcatus, has been developed using a single chiral precursor.
BAND STRUCTURE OF THE ORGANIC SUPERCONDUCTOR: (TMTSF)2X
Authors: Mori Takehiko , Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao
Published: July 2006

Energy band calculation of the organic superconductor (TMTSF)2X was carried out. The ratio of the intermolecular overlap integrals of the highest occupied molecular orbitals parallel and perpendicular to the chain axis is more than ten times smaller than that of TTF-TCNQ. The Fermi surface is a slightly waving plane.
PHOTOCHEMICAL REACTIVITY OF MEFLOQUINE, A NEW SYNTHETIC ANTIMALARIAL
Authors: Epling Gary A , Yoon Ung Chan
Published: July 2006

The photochemistry of mefloquine, an experimental antimalarial drug, has been examined with an eye towards understanding its comparatively low phototoxicity.
A NOVEL SYNTHESIS OF ROYAL JELLY ACIDS AND QUEEN SUBSTANCE BY THE FIVE CARBON HOMOLOGATION USING β-VINYL-β-PROPIOLACTONE
Authors: Fujisawa Tamotsu , Sato Toshio , Itoh Toshiyuki
Published: July 2006

10-Hydroxy-(E)-2-decenoic acid, (E)-2-decenedioic acid (Royal jelly acids), and 9-oxo-(E)-2-decenoic acid (queen substance) were synthesized via 10-hydroxy-3-decenoic acid and 9,9-ethylenedioxy-3-decenoic acid, respectively, prepared easily by the regioselective ring-opening reaction of β-vinyl-β-propiolactone with Grignard reagents in the presence of copper(I) catalyst.
NEW BUTENOLIDES FROM THE GORGONIAN EUPLEXAURA FLAVA(NUTTING)
Authors: Kikuchi Hiroyuki , Tsukitani Yasumasa , Nakanishi Hajime , Shimizu Iwao , Saitoh Shuichi , Iguchi Kazuo , Yamada Yasuji
Published: July 2006

Four new butenolides (1a–d) were isolated from the Japanese gorgonian Euplexaura flava(Nutting). The structures of these compounds were elucidated from spectral data and chemical reactions.
SYNTHESIS OF 3-OXYGENATED 13-NORHELIANG0LIDES
Authors: Kuroda Chiaki , Hirota Hiroshi , Takahashi Takeyoshi
Published: July 2006

Optically active [3R,6S,7S,1(1O)E,4Z]- and [3R,6R,7S,1(10)E,4Z]-3-methoxymethoxy-13-nor-1(10),4-germacradieno-12,6-lactones, key synthetic intermediates for 3-oxygenated heliangolides, were synthesized from (−)-carvone.
Cu(I)-CATALYZED REACTION OF TERMINAL ALKYNES WITH PHENYL SELENOCYANATE IN THE PRESENCE OF TRIETHYLAMIME. SYNTHESIS OF ALKYNYL SELENIDES1
Authors: tomoda Shuji , Takeuchi Yoshito , Nomura Yujiro
Published: July 2006

Treatment of terminal alkynes with phenyl selenocyanate in dichloromethane in the presence of CuX(X=CN or Br) and triethylamine at room temperature gave 1-phenylseleno-1-alkynes in high yields.
FULLY ALKYLATED CHIRAL DIPHOSPHINES, RDIOP, AND THEIR Rh(I) COMPLEXES
Authors: Tani Kazuhide , Suwa Kenichi , Yamagata Tsuneaki , Otsuka Sei
Published: July 2006

Tetraalkyl analogs of DIOP, (−)-EtDIOP, (−)-i-PrDIOP, and (−)-CyDIOP, have been prepared for the first time by the reaction of (+)-2,3-O-isopropylidene-2, 3-dihydroxy-1,4-difluorobutane and the corresponding lithium dialkylphosphides. These diphosphines form cationic Rh(I) complexes, [Rh{(-)-RDIOP} (NBD)]C104 (R=Et, i-Pr, and Cy), which show remarkable reactivity toward dihydrogen
ON THE THERMOCHROMISM OF A Cu-(N)4-TYPE COPPER(II) CHELATE, BIS(1,5-DIAZA CYCLOOCTANE)COPPER(II) NITRATE
Authors: Yamaki Sayuri , Fukuda Yutaka , Sone Kozo
Published: July 2006

The title complex, [Cu(daco)2](NO3)2, was newly obtained, and found to show a characteristic reversible thermochromism. Its color changes from orange to violet on heating at 90°C, and becomes orange again on cooling. The mechanism of this thermochromism is suggested on the basis of the UV-visible reflectance spectra, and IR and TG-DTA data.
PHOTOCHEMICAL REACTION OF N-METHYL-α,β,γ,δ-TETRAPHENYLPORPHINATOZINC ETHYL. HOMOLYSIS AND SUBSTITUTION WITH VISIBLE LIGHT
Authors: Inoue Shohei , Murayama Hideki , Takeda Norikazu , Ohkatsu Yasukazu
Published: July 2006

N-Methyl-α,β,γ,δ-tetraphenylporphinatozinc ethyl undergoes the homolytic cleavage of the ethyl-zinc group in methylene chloride by the excitation of the porphyrin ring with visible light, resulting in the substitution of a chlorine for the ethyl group.
EFFECT OF STEPWISE DOPING OF Al2O3 AND Li2O ON MICROSTRUCTURE AND ELECTRICAL RESISTIVITY OF ZnO CERAMICS
Authors: Takuma Yasuhisa , Miyayama Masaru , Yanagida Hiroaki
Published: July 2006

Porous and high-resistive ZnO ceramics were obtained by a stepwise doping method of Al2O3 and Li2O. Lithia increased the resistivity of ZnO doped with Al2O3 without a change of porous microstrucrure. The sensitivities of the stepwisely doped specimens to reducing gases at 300°C were improved compared to that of the singly doped specimens.
SELECTIVE ALLYLIC REARRANGEMENT WITH TUNGSTEN CATALYST
Authors: Hosogai Takeo , Fujita Yoshiji , Ninagawa Yoichi , Nishida Takashi
Published: July 2006

Selective thermal rearrangement of allylic alcohols proceeds in the presence of various O=W(OR)4. Ligand catalysts which are more stable than O=W(OR)4 catalyst and are several times more active than O=V(OR)3 catalyst.
MEASUREMENT OF PHOTOCHEMICAL CHANGES OF PRESENSITIZED OFFSET PRINTING PLATES BY FOURIER TRANSFORM INFRARED PHOTOACOUSTIC SPECTROSCOPY
Authors: Teramae Norio , Yamamoto Takeshi , Hiroguchi Masayuki , Matsui Tomoko , Tanaka Shigeyuki
Published: July 2006

Fourier transform infrared photoacoustic spectroscopy(FTIR-PAS) was applied to the measurement of photochemical changes of presensitized offset printing plates. FTIR-PAS was found to be a useful method for obtaining direct information on structural changes of photosensitive resins on roughened metal surface.
A NEW METHOD FOR THE REGIO- AND STEREOSELECTIVE SYNTHESIS OF ALDOLS FROM α-BROMOKETONE AND CARBONYL COMPOUNDS BY USING METALLIC TIN
Authors: Harada Taira , Mukaiyama Teruaki
Published: July 2006

Tin(II) enolates, generated in situ by the oxidative addition of α-bromoketones to metallic tin, react with a variety of carbonyl compounds under mild conditions to give the corresponding aldols in good yields. In the case of reactions of the enolate resulted from α-substituted α-bromoketone with aldehydes, remarkably high erythro-selectivities are attained.
PREPARATION AND OPTICAL RESOLUTION OF COBALT(III) COMPLEXES WITH 2-SELENOLATOETHYLAMINE AND ITS DERIVATIVES
Authors: Konno Takumi , Okamoto Ken-ichi , Hidaka Jinsai
Published: July 2006

Four optical isomers of Co(III) complexes with a coordinated selenium atom, [Co(L)(en)2]2+ or 3+ (L = 2-selenolatoethylamine, 2-selenenatoethylamine, 2-seleninatoethylamine, and 2-(methylseleno)ethylamine), were newly prepared and characterized on the basis of the electronic absorption and circular dichroism (CD) spectra.
ONE-STEP SYNTHESIS OF ω-HYDROXYCARBOXYLIC ACIDS BY THE REACTION OF ω-METALOXYLATED GRIGNARD REAGENTS WITH β-PROPIOLACTONES
Authors: Fujisawa Tamotsu , Mori Toshiki , Kawara Tatsuo , Sato Toshio
Published: July 2006

ω-Metaloxylated Grignard reagents reacted with β-propiolactones chemo- and regioselectively in the presence of Li2CuCl4 to afford ω-hydroxycarboxylic acids in high yields.
A NOVEL ORTHO-SUBSTITUENT EFFECT ON FORMATION OF VINYL CATIONS IN THE PHOTOLYSIS OF VINYL BROMIDES
Authors: Kitamura Tsugio , Muta Tomonobu , Kobayashi Shinjiro , Taniguchi Hiroshi
Published: July 2006

Introduction of a substituent into ortho-position of β-aryl group in a vinyl bromide resulted in the preferential formation of a vinyl cation in the photolysis. It is considered that the steric repulsion of β-aryl groups makes a convenient conformation for an electron transfer from the aromatic ring to the halogen atom in the radical pair.
EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF HIGHER CARBOXYLIC ACIDS WITH BIS[2-(5-CHLORO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL] COBALT(III) CHLORIDE
Authors: Seno Kunihiko , Miyata Haruo , Tôei Kyoji
Published: July 2006

Higher carboxylic acid reacts with Bis[2-(5-chloro-2-pyridylazo)-5-diethylaminophenol] cobalt(III) chloride, Co-5-Cl-PADAP, to form a 1:1 ion-pair, which is extracted into chlorobenzene in a single extraction at pH 11. The molar absorptivities of the ion-pairs of C12, C14, C16 and C18 acids are 3.5, 6.6, 7.6 and 7.6×104 1 mol−1 cm−1 at 563 nm, respectively.
A NOVEL SEQUENCE OF DISPLACEMENT REACTIONS OF A DIHALOGENATED Δ4-3-KETOSTEROID
Authors: Koga Toshitaka , Toh Namiko , Nogami Yasuyoshi
Published: July 2006

Acetolysis of 2α,4-dibromocholest-4-en-3-one affords 2β,6β-disubstituted product and the reaction is explained to proceed by the successive SN2 and SN2′ mechanisms.
ACYCLIC AROMATICITY. TRIMETHYLENEMETHANE DIANION
Authors: Inagaki Satoshi , Hirabayashi Yoshio
Published: July 2006

The extent of electron delocalization in acyclic π-conjugated systems such as the dianions of trimethylenemethane and butadiene is shown to be determined by the orbital phase continuity–discontinuity properties.
A SIMPLE METHOD FOR THE SPECTRAL CONTROL OF MEROCYANINE FILM
Authors: Iriyama Keiji
Published: July 2006

A simple method for the spectral control of merocyanine films has been developed.
THERMAL REACTIONS OF PHENYL DERIVATIVES OF DIMETHYLSULFONIUM 1-AROYL-6-OXO-2,4-HEXADIENYLIDE. A REMARKABLE EXAMPLE OF REACTIONS CONTROLLED BY INTRAMOLECULAR STERIC INTERFERENCES
Authors: Toda Takashi , Tokida Akihiko , Mukai Toshio
Published: July 2006

Thermal reactions of the titled compounds showed multiple mode of reactivities and gave variety of products by difference of the number and positions of phenyl groups. Those facts were interpreted in terms of the reaction paths controlled by degree of intramolecular steric interferences of phenyl groups in the dimethylsulfonium 1-aroyl-6-oxo-2,4-hexadienylide system.
SYNTHESES AND REGIOSELECTIVE CYCLOADDITION REACTIONS OF CYCLOHEPT[d]IMIDAZO[1,2-a]IMIDAZOLES (1,3a,9-TRIAZACYCLOPENT[a]AZULENES): FORMATION OF 2,3-DIAZACYCLOHEPTA[ef]CYCL[3.2.2]AZINE SYSTEM
Authors: Abe Noritaka , Nishiwaki Tarozaemon , Yamamoto Hideko
Published: July 2006

Cyclohept[d]imidazo[1,2-a]imidazoles (1,3a,9-triazacyclopent[a]azulenes), being synthesized from 2-aminocycloheptimidazole, was allowed to react with reactive acetylenes to give 2,3-diazacyclohepta[ef]cycl[3.2.2]azines regioselectively.
THERMOCHEMICAL HYDROGEN PRODUCTION BY THE MAGNESIUM-SULFUR-IODINE CYCLE
Authors: Mizuta Susumu , Kumagai Toshiya
Published: July 2006

A new thermochemical cycle for hydrogen production is presented. It consists of (i) redox reaction of sulfur dioxide and iodine with magnesium oxide in an aqueous solution, (ii) hydrolysis of magnesium iodide, (iii) thermal decomposition of magnesium sulfate and (iv) thermal dissociation of hydrogen iodide. Key reactions (i) and (ii) were experimentally verified.
SYNTHESIS OF (±)-DESEPOXY-4,5-DIDEHYDROMETHYLENOMYCIN A
Authors: Takahashi Yasuhiro , Kosugi Hiroshi , Uda Hisashi
Published: July 2006

The reaction of methyl (E)-3-lithio-2-methyl-3-phenylthioprop-2-enoate (4) with methyl (E)-4-(t-butyldimethylsilyloxy)but-2-enoate (5) provides the functionalized cyclopentenone (6) in one step, which is transformed into both Koreeda’s and Smith’s intermediates (2) and (3) for synthesis of (±)-desepoxy-4,5-didehydromethylenomycin A (1).
DISSOLVED NITRATE REDUCTASE IN NATURAL WATER
Authors: Kishibe Kazumi , Fujiwara Kitao , Kobayashi Kensei , Haraguchi Hiroki , Fuwa Keiichiro
Published: July 2006

Nitrate reductase activity dissolved in natural water was detected for the first time. The characteristics of this enzymatic activity were compared with the commercial nitrate reductase in terms of thermal denaturation, inhibitor spectrum, and gel permeation chromatography.
INTRAMOLECULAR PHOTOCHEMICAL REACTIONS OF RIGID DIENONES. PREPARATION AND PHOTOLYSIS OF 10-SUBSTITUTED TRICYCLO [5. 3. 1. 02,6] UNDECA-3,9-DIEN-8-ONES AND -4,9-DIEN-8-ONES
Authors: Ogino Toshio , Awano Kazuyuki
Published: July 2006

A series of the title compounds (R=OMe, H, Me, Ph) were prepared and photochemical behaviors of these compounds were examined. Although most of the substrates underwent intramolecular [2+2] cycloaddition to give novel trishomocubanes upon irradiation, the phenyl derivative of Δ4 isomer gave a product via competing allylic hydrogen abstraction, as well as the cyclization product.
THE CATALYTIC ACTIVITY OF A NOVEL SILICA-SUPPORTED COPPER CATALYST FOR THE CO OXIDATION WITH N2O
Authors: Kakuta Noriyoshi , Kazusaka Akio , Miyahara Koshiro
Published: July 2006

A novel silica-supported copper catalyst, prepared from cupric acetate monohydrate having a dimeric structure of cupric ions, showed a very high activity for the CO oxidation with N2O at 150°C as compared with a conventional silica-supported copper catalyst. It was suggested on the basis of the ESR spectroscopic characterization that such an extraordinary catalytic activity resulted from the structure of the Cu2+ ions derived from cupric acetate monohydrate on silica.
ATMOSPHERE DEPENDENT PHOTOREACTION OF METHYL 4-PYRIDINECARBOXYLATE IN METHANOL. METHOXYLATION AT 3-POSITION UNDER O2 AND METHOXYLATION AND HYDROXYMETHYLATION AT 2-POSITION UNDER N2
Authors: Sugiyama Toru , Yagi Kazuya , Ito Yoko , Sugimori Akira
Published: July 2006

The UV-Irradiation of methyl 4-pyridinecarboxylate in methanol under oxygen in the presence of H2SO4 brings about methoxylation at the 3-position of the pyridine ring, while under nitrogen methoxylation and hydroxymethylation occur at the 2-position.
ACTIVATION OF CONVENTIONAL S-PROTECTING GROUPS OF CYSTEINE BY CONVERSION INTO THE 3-NITRO-2-PYRIDINESULFENYL (NPYS) GROUP
Authors: Matsueda Rei , Higashida Susumu , Ridge Richard J , Matsueda Gary R
Published: July 2006

All of the conventional S-protecting groups of cysteine which were tested could be selectively converted to the 3-nitro-2-pyridinesulfenyl (Npys) group after treatment with an appropriate Npys halide. Unidirectional formation of an unsymmetrical disulfide bond is possible when Cys (Npys) is mixed with a free thiol of another Cys residue. Some of these features were exploited during the solid phase synthesis of lysine8-vasopressin.
AN OPTICALLY ACTIVE COBALT(III)-SELENIDE COMPLEX. INVERSION AT SELENIUM IN TWO ISOMERS OF THE [2-(METHYLSELENO)ETHYLAMINE][TRIS(2-AMINOETHYL)AMINE]COBALT(III) ION
Authors: Nakajima Kiyohiko , Kojima Masaaki , Fujita Junnosuke
Published: July 2006

The optically active selenide complex, trans(tertiary amine nitrogen, Se)-[Co(CH3SeCH2CH2NH2){N(CH2CH2NH2)3}]3+, has been obtained for the first time by SP-Sephadex column chromatography. It loses ca. 50% of optical activity in 1 h at 22°C in 1 mol/dm3 NaClO4.
4-O-BENZYL-2,3-O-ISOPROPYLIDENE-l-THREOSE —A NEW AND USEFUL BUILDING BLOCK FOR THE SYNTHESES OF l-SUGARS—
Authors: Mukaiyama Teruaki , Suzuki Keisuke , Yamada Tohru
Published: July 2006

4-O-Benzyl-2,3-O-isopropylidene-l-threose (1), a new building block for the synthesis of carbohydrates was prepared. The stereoselective addition of various nucleophiles to 1 afforded useful intermediates toward l-sugar derivatives.
STEREOSELECTIVE SYNTHESIS OF (E)-, (E,Z)- AND (E,E)-CONJUGATED DIENES VIA ALKYLATION OF 3-SULFOLENES AS KEY STEP
Authors: Yamada Sachiko , Ohsawa Hideto , Suzuki Takayoshi , Takayama Hiroaki
Published: July 2006

Stereoselective method for synthesizing (E)-, (E,Z)- and (E,E)-conjugated dienes via alkylation of 3-sulfolenes as key step is developed. Sex pheromones with (E)- and (E,E)-conjugated diene structures are synthesized with exclusively high stereoselectivity by applying the method.
CATALYTIC GASIFICATION OF WOOD FOR METHANOL SYNTHESIS GAS
Authors: Yamazaki Kenji , Yamaguchi Tsuyoshi , Tanaka Yoshinori , Ueno Akifumi , Kotera Yoshihide
Published: July 2006

Gas composed of hydrogen and carbon monoxide with 2:1 volume ratio was supplied by catalytic gasification of wood, when NiO/Al2O3 catalyst was employed at 700°C in the presence of water vapor.
9,10-DICYANOANTHRACENE-SENSITIZED PHOTOISOMERIZATION OF 1,2-BIS(4-METHOXYPHENYL)CYCLOPROPANES INVOLVING A CHAIN PROCESS
Authors: Mizuno Kazuhiko , Hiromoto Ziro , Ohnishi Keiji , Otsuji Yoshio
Published: July 2006

The photochemical cis-trans isomerization of cis- and trans-1,2-bis(4-methoxyphenyl)cyclopropanes sensitized by 9,10-dicyanoanthracene in aerated acetonitrile solutions proceeds via a chain process in which a cation radical produced from the cyclopropanes is involved as a chain carrier. The quantum yield for this photoisomerization is remarkably enhanced by the addition of air and phenanthrene.
SYNTHESIS OF dl-(2E,6Z,10E)-CERICERENE FOR ELUCIDATION OF THE PROPOSED STRUCTURE OF CERICEROL-I
Authors: Ikeda Yoshie , Aoki Mario , Uyehara Tadao , Kato Tadahiro , Yokoyama Toshiro
Published: July 2006

dl-(2E,6Z,10E)-Cericerene was synthesized and its spectral data were compared with those of cericerene derived from cericerol-I, revealing that the reported arrangement of annular double bonds of cericerol-I and related compounds should be revised.
THE MEASUREMENT OF INFRAREL REFLECTION-ABSORPTION SPECTRA OF THIN POLYVINYLACETATE FILMS FORMED ON SILICON SURFACES
Authors: Hatta Aritada , Matsumoto Hidetoshi , Suëtaka Wataru
Published: July 2006

Infrared reflection-absorption spectra of thin polyvinylacetate films formed on silicon surfaces have been measured by both double-beam and polarization modulation methods. The spectrum is observed as a reflectivity maximum or minimum depending upon the angle of incidence. It is shown that polarization modulation method is extremely useful for investigating surface films on silicon.
HIGH PERFORMANCE LIQUID CHROMATOGRAPHY OF BOVINE AND HUMAN CARBONIC ANHYDRASE, COMPONENTS A AND B
Authors: Hirose Junzo , Nakagawa Mikiko , Achiwa Kyoko , Noji Masahide , Kidani Yoshinori
Published: July 2006

Bovine carbonic anhydrase [carbonate hydrolyase, EC 4.2.11] has been analyzed by high performance liquid chromatography, HPLC, using a TSK column, IEX-540 DEAE, eluted with 0.01 mol dm−3 phosphate buffer of pH 6.5. By means of this method, components A and B of bovine carbonic anhydrase, BCA(A) and BCA(B), showed peaks at tR=13.5 and 5.5 min, and the apo-BCA(A) and apo-BCA(B) showed peaks at tR=15.8 and 6.0 min, respectively. Under the same conditions, human CA(B) showed a peak at tR=2.4 min.
PARTICLE FORMATION OF GAS-PHASE SILICON COMPOUNDS AND AROMATIC COMPOUNDS BY LIGHT OR ELECTRON IRRADIATION
Authors: Nagata Yoshio , Dohmaru Takaaki , Fujita Shin-ichi , Oka Kunio , Taniguchi Setsuo
Published: July 2006

A number of silicon compounds and aromatic compounds form particles under UV light or electron beam irradiation in the gas phase. Carbonyl compounds, halogen compounds and some aromatic compounds act as initiators for photo-induced particle formation of silicon compounds.
STERICALLY BULKY PORPHYRINS: THE ATROPISOMERS OF TETRAKIS(3,5-DI-TERT-BUTYL-2-NITROPHENYL)PORPHYRIN AND THEIR IRON(III) COMPLEXES
Authors: Miyamoto T Ken , Hasegawa Tai , Takagi Shigeru , Sasaki Yukiyoshi
Published: July 2006

A new “bis pocket” porphyrin has been prepared and characterized. Its four geometric isomers (atropisomers) have been separated by chromatography. Each isomer has relatively high conformational stability to light and prolonged heating. Practical utility of this ligand system to iron(III) chemistry has been demonstrated.
REDUCTION OF α-HALOCARBONYL COMPOUNDS WITH SODIUM HYDROGEN TELLURIDE
Authors: Osuka Atsuhiro , Suzuki Hitomi
Published: July 2006

Sodium hydrogen telluride is an efficient reagent for dehalogenation of α-halocarbonyl compounds.
REGIOSELECTIVE REACTION OF PHENYLSULFENYL ALLYLIC CARBANION WITH EPOXIDE AND SYNTHESIS OF PROSTAGLANDIN INTERMEDIATE
Authors: Nokami Junzo , Ono Toshio , Nakagawa Satoshi , Wakabayashi Shoji
Published: July 2006

An ambident nucleophile derived from 1-phenylsulfenyloct-2-ene reacts at the α-carbon with epoxide. The reaction has been employed for the preparation of a key intermediate for synthesis of prostaglandins.
ISOLATION OF OPPOSITANE- AND CYCLOEUDESMANE-TYPE SESQUITERPENOIDS FROM TORILIS JAPONICA D.C.
Authors: Itokawa Hideji , Matsumoto Hajime , Mihashi Susumu
Published: July 2006

Oppositane-, eudesmane-, and new cycloeudesmane-type sesquiterpenes were isolated from Torilis japonica D.C. All the compounds can be biogenetically correlated to epoxygermacrene-D.
UNUSUAL KINETIC BEHAVIOR OF BIS-FLAVIN FOR N-BENZYL-1,4-DIHYDRONICOTINAMIDE (BNAH) REDUCTION IN AN AQUEOUS SOLUTION
Authors: Yano Yumihiko , Ohya Eiichi
Published: July 2006

Several bis-flavins linked at 10,10′-positions of isoalloxazine rings were synthesized. The reactivity of each flavin of a bis-flavin was found to be considerably influenced by another intramolecular flavin moiety, depending on the conformation of the bis-flavin.
α-BROMOALLYLSTANNANES AS SYNTHETIC TOOLS: PREPARATIONS AND REACTIVITIES
Authors: Shibasaki Masakatsu , Suzuki Hideyuki , Torisawa Yasuhiro , Ikegami Shiro
Published: July 2006

A couple of useful compounds such as E-1-bromo-3-oxo-1-alkenes, E-1-substituted-1,3-dienes and 3-hydroxy-1-alkynes are prepared from α-bromoallylstannanes derived from the corresponding α,β-unsaturated aldehydes.