bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOREACTIONS VIA π-π* AND n-π* TRIPLET STATES OF FLAVANONES
Authors: Matsushima Ryoka , Kishimoto Tsuneo , Suzuki Morio
Published: July 2006

Photolyses of flavanone and substituted flavanones in benzene led to the cleavage of the pyrone ring to give corresponding 2′-hydroxychalcones, while similar irradiation of flavanone or 4-chromanone in 2-propanol gave coupling products (pinacols and solvent adducts). However, photolysis of 7,8-benzoflavanone in 2-propanol led to the cleavage of the pyrone ring instead of the formation of coupling products. It is implied that the cleavage of the pyrone ring takes place via π-π* triplet states, while formation of coupling products via n-π* triplet states.
CATALYTIC ACTIVITIES OF SOLID PORPHYRINS FOR THE REDUCTION OF NITRIC OXIDE
Authors: Mochida Isao , Takeyoshi Kazuko , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

Some metal-tetraphenylporphines(M-TPP) reduce NO catalytically with molecular hydrogen at elevated temperatures. The main products are N2 and NH3 over Co-TPP, and NH3 over Cu-TPP, regardless of the reaction temperatures. Supporting of the complexes on silica-alumina increased the catalytic activity by a factor of eighteen.
TOSYLSULFONIUM IONS AND ACYLSULFONIUM IONS
Authors: Minato Hiroshi , Yamaguchi Kei , Miura Takashi , Kobayashi Michio
Published: July 2006

When p-Tol-SO2-SMe and CF3-SO3Me were allowed to react in a sealed tube, p-Tol-SO2-⊕SMe2 CF3-SO2\ominus was isolated as crystals, which upon reaction with Et2NH yielded p-Tol-SO2NEt2. The reaction between p-Tol-SO2-⊕SMe and FSO3H did not yield p-Tol-SO2⊕SHMe FSO3\ominus but yielded p-Tol-⊕SO2H-SMe FSO3\ominus. From the reaction between PhCH2CO-SMe and CF3SO3Me, PhCH2CO-⊕SMe2 was not observable, and the products found were Me3S⊕ and PhCH2CO2Me.
CONFORMATION OF COORDINATED AMINO ACIDS. I. TETRAMMINE(l-PHENYLALANINATO)COBALT(III) ION
Authors: Sakaguchi Ushio , Yoneda Hayami
Published: July 2006

The ABX type spectrum of three CH protons of l-phenylalanine in tetrammine(l-phenylalaninato)cobalt(III) ion was analysed and it was found that fractional populations of three rotational isomers of the amino acidato ligand are significantly different from those in the free amino acid.
TWO STEP OXIDATION REACTIONS OF ALCOHOLS ON AN ILLUMINATED RUTILE ELECTRODE
Authors: Miyake Mikio , Yoneyama Hiroshi , Tamura Hideo
Published: July 2006

Alcohols (methanol, ethanol and iso-propanol) were found to be oxidized by the “current doubling” process on an illuminated rutile electrode. The reactivity of alcohols decreased in the order, methanol > ethanol > iso-propanol. This tendency seems to correspond to the amount of adsorbed alcohol on rutile.
METALLOPORPHYRINS. I. PHOTOINDUCED meso-ACYLAMINATION OF PORPHYRIN RING USING ACYL AZIDES
Authors: Ichimura Kunihiro
Published: July 2006

Zinc octaethylporphin sensitizes the photodecomposition of acyl azide to yield zinc complex of 5-acylamino-2,3,7,8,12,13-17,18-octaethylporphin.
SYNTHESIS OF OPTICALLY ACTIVE METHYLOXIRANE FROM PROPYLENE CHLOROHYDRIN IN THE PRESENCE OF Co(SALEN) TYPE COMPLEX
Authors: Ishimori Michihiro , Aoi Haruhiko , Takeichi Tsutomu , Tsuruta Teiji
Published: July 2006

In the presence of optically active CoIII complex, methyloxirane was prepared from propylene chlorohydrin using a variety of bases. The highest optical purity of methyloxirane obtained was 27 %.
RESTRICTED ROTATION INVOLVING THE TETRAHEDRAL CARBON. XIX. EFFECTS ON CHARGE-TRANSFER INTERACTION ON THE POPULATION OF ROTAMERS AND ON BARRIERS TO ROTATION IN 1-(9-FLUORENYL)-2-NAPHTHYL AROATES
Authors: Nakamura Mikio , Oki Michinori
Published: July 2006

Equilibrium constants between ap and sp forms of 1-(9-fluorenyl)-2-naphthyl aroates suggest the presence of charge-transfer interaction between the fluorenyl group and an aroyl group with a nitro substituent. The barriers to rotation of the nitro compound were also consistent with the presence of the charge-transfer interaction.
HOMOGENEOUS CATALYTIC REDUCTION OF AROMATIC NITRO-COMPOUNDS BY HYDROGEN TRANSFER
Authors: Imai Hideaki , Nishiguchi Takeshi , Fukuzumi Kazuo
Published: July 2006

In the presence of noble metal salts, indoline reduced aromatic nitro-compounds to the corresponding aromatic amines under mild reaction conditions.
PALLADIUM AND PLATINUM COMPLEXES OF A NEW CHELATE YLIDE
Authors: Sugita Norifumi , Miyamoto Takeshi , Sasaki Yukiyoshi
Published: July 2006

A new phosphorus chelate ylide, benzoylmethylenedibenzyl-2-dibenzylphosphinoethylphosphorane and its complexes of Pd(II) and Pt(II) have been prepared and characterized.
EFFECT OF p-BENZOQUINONE ON SPECTRAL SENSITIZATION OF SILVER CHLORIDE
Authors: Abe Takao , Sukigara Mitsunori , Honda Kenichi
Published: July 2006

The spectral sensitization of silver chloride has been studied electrochemically. The fact that the effect of p-benzoquinone on the dye-sensitized photocurrent depends on the kinds of dye and electrolyte suggests the existence of two electron transfer channels in the sensitization process.
CATALYTIC ACTIVITY OF ZrO2 AND ThO2 FOR H-D EXCHANGE REACTION BETWEEN METHYL GROUP OF ADSORBED ISOPROPYL ALCOHOL-d8 AND SURFACE OH GROUP
Authors: Yamaguchi Tsutomu , Nakano Yasuko , Iizuka Tokio , Tanabe Kozo
Published: July 2006

The H-D exchange reaction of methyl group of adsorbed isopropyl alcohol-d8 with surface OH group was studied over several metal oxides by means of reflectance IR spectroscopy. Zirconium oxide and ThO2 showed a significant catalytic activity for the exchange reaction, though SiO2, Al2O3, TiO2, and SiO2–Al2O3 were all inactive.
HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHIC SEPARATION OF INDIVIDUAL BILE ACIDS: FREE, GLYCINE AND TAURINE CONJUGATED BILE ACIDS
Authors: Okuyama Sumihiko , Uemura Daisuke , Hirata Yoshimasa
Published: July 2006

High-performance liquid-chromatographic separation of bile acids, free and conjugated with taurine and glycine, is described. The analysis of free and glycine conjugated bile acids is based on the esterification of the carboxylic group of bile acids with 1-p-nitrobenzyl-3-p-tolyltriazene. On the other hand, taurine conjugated bile acids are separated and detected by an ultraviolet detector (210 nm), directly.
PROTON DYNAMICS IN TIN(II) CHLORIDE DIHYDRATE STUDIED BY NMR
Authors: Kiriyama Hideko , Nakamura Osamu , Kiriyama Ryôiti
Published: July 2006

The proton T1 and T1ρ in single crystal and polycrystalline SnCl2·2H2O were measured. The T1ρ exhibits a minimum around 270 K. Both T1 and T1ρ are dominated by three-fold reorientations of water molecules. The activation energy is 49 kJ/mol. The deuteron NMR spectra suggest the combined motion of the 180° flip and the three-fold rotation. Near Ttr 218 K, the lg T1 vs 1/T curve shows a casp shaped dip as a critical phenomenon.
CHROMATOGRAPHIC STUDY OF OPTICAL RESOLUTION I. COMPLETE RESOLUTION OF THE NEUTRAL COMPLEX, FACIAL ISOMER OF TRIS(β-ALANINATO)COBALT(III)
Authors: Yoneda Hayami , Yoshizawa Tadashi
Published: July 2006

Based on the consideration of crystal structures of three diastereomeric salts composed of the tris(ethylenediamine)metal complex and the d-tartrate anion, an attempt was made to resolve tris(β-alaninato)cobalt(III) by the chromatographic technique, and a complete resolution was achieved through a Sephadex column using sodium d-tartrate 30% aqueous ethanol solution as an eluent.
THE STRUCTURE OF THE 1:1 ADDUCT OF “HECTOR′S BASE” WITH ARYLCYANAMIDES BOND SWITCH ON HYPERVALENT SULFUR
Authors: Akiba Kin-ya , Tsuchiya Tohru , Inamoto Naoki , Onuma Ken-ichi , Nagashima Nobuya , Nakamura Asao
Published: July 2006

The structure of the 1:1 adduct of “Hector’s base” with arylcyanamides was determined by X-ray analysis of tris-p-bromophenyl derivative (1a). The molecule is almost planar and the strong interaction was exemplified between the sulfur and the nitrogen atoms.
The Palladium Catalyzed Carbonylation of Styrene. Effects of the Phosphines on the Products
Authors: Sugi Yoshihiro , Bando Ken-ichiro
Published: July 2006

The carbonylation of styrene with carbon monoxide and ethanol was investigated in the presence of diphosphine palladium complexes Pd[Ph2P(CH2)nPPh2]Cl2 (n=1–6,10). Ethyl 3-phenylpropionate was obtained significantly when the phosphines (n=3,4,5) were used. The predominant isomer in the case of the phosphines (n=l,6,10) was ethyl 2-phenylpropionate similar to the mono-dentate phosphines, such as Ph3P and Ph2PBu.
THE SESQUITERPENES OF CACALIA SPECIES
Authors: Naya Keizo , Miyoshi Yasushi , Mori Hideo , Takai Kunihiro , Nakanishi Mikihiko
Published: July 2006

Twelve sesquiterpenes including six new compounds have been isolated from Cacalia delphiniifolia Sieb. et Zucc. and C. hastata L. var. tanakae (Franch. et Savat.) Kitam., and their structures have also been determined by their physical and chemical properties.
PHOTOLYSES OF TRICYCL0[4.2.2.03,5]DECA-7-EN-2-ONE SYSTEMS
Authors: Sasaki Tadashi , Kanematsu Ken , Okamura Naoya
Published: July 2006

Photolyses (Pyrex, > 290 nm) of tricyclodecaenone derivatives (cyclopropylketone-π-methane moiety) gave the exclusive 1,3-acyl shift products in high yields.
THE SELECTION OF O2(1Δg)-OLEFIN REACTION COURSES. INTERMOLECULAR NONBONDED ATTRACTION AND π BOND POLARITY OF OLEFINS
Authors: Inagaki Satoshi , Fujimoto Hiroshi , Fukui Kenichi
Published: July 2006

Two important factors are proposed to select the course of singlet oxygen reactions with olefins. The polarity of olefin π bond and the intermolecular nonbonded attraction controls the orientation of the initially-attacking oxygen atom and the tailing one in a perepoxide structure, respectively.
FACILE SKELETAL REARRANGEMENT BY SOLVOLYSIS OF TRICYCLODECAENYL TOSYLATE
Authors: Sasaki Tadashi , Kanematsu Ken , Kondo Akihiro
Published: July 2006

Acetolysis of the tricyclic tosylate (exo-2) leads to a mixture of the transannular product (4) and the rearranged product (5), whereas the epimer (endo-2) undergoes only rearrangement to syn-8.
A NEW ROUTE TO ALKYL SELENOCYANATE FROM OLEFIN VIA HYDROBORATION. REACTION OF ORGANOBORANES WITH FERRIC SELENOCYANATE
Authors: Arase Akira , Masuda Yuzuru
Published: July 2006

Trialkylboranes, prepared by hydroboration of terminal or internal olefins, react with ferric selenocyanate in an aqueous tetrahydrofuran to give corresponding primary or secondary alkyl selenocyanates.
THE REACTIONS OF DIBENZYLSELENONIUM YLIDE, IMIDE, AND SELENOXIDE WITH TRIPHENYLPHOSPHINE
Authors: Tamagaki Seizo , Hatanaka Isao , Tamura Katsuyuki
Published: July 2006

The reactions of dibenzylselenonium dicyanomethylide or cyanomethoxycarbonylmethylide with triphenylphosphine at room temperature gave 2-benzyl-2-cyano-3-phenylpropanenitrile or methyl 2-benzyl-2-cyano-3-phenylpropanoate by deselenization and the addition of acetic acid into the reaction system changed the reaction mode, yielding mainly dibenzyl diselenide. Meanwhile, the corresponding selenonium imide and selenoxide afforded dibenzyl selenide.
A NEW COMPOUND, Lu2V2O7
Authors: Kitayama Kenzo , Katsura Takashi
Published: July 2006

A new compound, Lu2V2O7, which belongs to pyrochlore-type, has been successfully synthesized under a low oxygen partial pressure at 1200°C and its formation conditions in oxygen partial pressure, crystal parameters including lattice constant, unit cell volume, density, spacing, and relative intensities were determined.
DETERMINATION OF THE OPTICAL PURITY OF A SMALL AMOUNT OF AMINO ACIDS (1–5 mg) EMPLOYING STEREOSELECTIVE COMPLEX FORMATION
Authors: Fujii Yuki , Hirasawa Shigeru , Takahashi Sozo
Published: July 2006

A new method has been established to determine the optical purity of about 1–5 mg of sample amino acids within a short time. The method utilizes the fact that [CH3COCH2–Co(acac2en)(H2O)] reacts with l-(or d-) amino acids rapidly to form ΛL-(or ΔD-)cis-β1(fac)-[Co(acac2en)(aa)] stereoselectively and thus, the reaction solution shows much larger optical rotation than the free amino acids.
PROTON MAGNETIC RESONANCE STUDY ON CONFORMATION OF 7,8,10,11-TETRAHYDRO-9H-CYCLOOCTA[de]NAPHTHALENE-9-ONE
Authors: Kamada Toshihiro , Yamamoto Osamu
Published: July 2006

The proton magnetic resonance spectra of the title compound (1) have been studied at various temperatures. The changes in variable-temperature PMR spectra of 1 are interpreted in terms of interconverting boat conformations. The free energy barrier ΔG\eweq for the ring inversion was found to be 12.4 kcal/mol. The stereochemical properties inherent in the peri-8 ring in 1 were discussed.
SELECTIVE HYDROGENATION OF DIOLEFINS CATALYZED BY HALOGENOTRIS(TRIPHENYLPHOSPHINE)COBALT(I)-LEWIS ACID
Authors: Kawakami Kiyoshi , Mizoroki Tsutomu , Ozaki Atsumu
Published: July 2006

Hydrogenation of diolefins to monoenes is highly selectively catalyzed by halogenotris(triphenylphosphine)cobalt(I) in the presence of Lewis acid in bromobenzene. Internal double bonds are reduced more rapidly than terminal ones.
SYNTHESIS AND PROPERTIES OF DIALKYL(ACETYLACETONATO)BIS(TERTIARY PHOSPHINE)COBALT(III)
Authors: Ikariya Takao , Yamamoto Akio
Published: July 2006

The complexes I-IV, CoR2(acac)(PR′3)2 (R=Me, Et, n-Pr, iso-Bu; PR′3=PEt3,P(n-Bu)3,PPhMe2,PPh2Me) have been prepared by the reactions of Co(acac)3, AlR2(OEt) and tertiary phosphines in ether. These complexes were characterized by NMR, IR spectroscopy and the chemical reactions. H-D scrambling in ethyl groups of Co(CH2CD3)2(acac)(PPhMe2)2 (V) has been observed.
THE REACTIONS OF CARBON DIOXIDE WITH DIALKYL COMPLEXES OF PALLADIUM(II)
Authors: Ito Takashi , Tsuchiya Hirotaka , Yamamoto Akio
Published: July 2006

Dialkylpalladium complexes, [Pd(CH3)2L2] and [Pd(C2H5)2L2], reacted with CO2 to yield CO2-coordinated complexes, [Pd(CH3)(CO2)L2] (L = PEt3, 1, and PMePh2, 2 (isolated as an acetone solvate)) and [Pd(C2H4)(CO2)L2] (L = PEt3, 3, and PMePh2, 4), respectively. Complexes 1–4 were isolated and characterized on the basis of elemental analysis, chemical reactions, IR, and 1H-NMR spectral evidence.
REACTION OF 1-CHLORO-2,4-DINITROBENZENE WITH THIOLS IN THE PRESENCE OF A CROWN ETHER
Authors: Nakabayashi Takeshige , Kawamura Shunichi , Horii Toyokazu , Hamada Masayuki
Published: July 2006

The title reaction was carried out and the corresponding 2,4-dinitrophenyl sulfides were obtained. The scope of the reaction was examined, and visible and NMR spectra of the reaction mixtures were measured.
PREPARATION AND PROPERTIES OF COMPLEX SALT OF SULFILIMINE AND TCNQ
Authors: Yamamoto Tamotsu , Yamauchi Masaharu , Okawara Makoto
Published: July 2006

The interaction between sulfilimines and TCNQ in CH2Cl2 was examined. The interaction depended markedly upon the structure of the sulfilimines: the higher the basicity of the sulfilimine, the stronger the interaction observed. For the crystalline complex of S,S-dimethyl-N-p-nitrophenylsulfilimine–TCNQ, 1:1 structure of biradical-salt type was estimated by spectroscopic and chemical analyses.
SYNTHETIC APPROACH TO FUJENOIC ACID III. SYNTHESIS OF DEMETHYLFUJENOIC ACID DERIVATIVE
Authors: Kato Tadahiro , Suzuki Takeshi , Ototani Noboru , Kitahara Yoshio
Published: July 2006

Demethylfujenoic acid derivative (14) has been synthesized from the key intermediate (2) by the application of Diels–Alder and subsequent reactions as shown in the scheme.
A MULTI-CYCLIC INTERACTION EFFECT ON SYMMETRY-IMPOSED STEREOSELECTION RULE. ANTI-BISALLYLIC SYSTEM
Authors: Inagaki Satoshi , Minato Tsutomu , Fujimoto Hiroshi , Fukui Kenichi
Published: July 2006

The symmetry-imposed stereoselection rule is partially modified on the basis of orbital interaction. The modification is required for multi-cyclic interactions. The mechanisms of “symmetry-forbidden” 1,3-migration in bisallylic compounds were discussed successfully.
REDUCTION BY A MODEL OF NAD(P)H. VIII. EFFECTS OF METAL ION ON THE COURSE AND STEREOCHEMISTRY OF THE BIOMIMETIC REDUCTION OF OLEFIN
Authors: Ohnishi Yutaka , Kagami Masayuki , Numakunai Takashi , Ohno Atsuyoshi
Published: July 2006

Asymmetric reduction of an olefin is achieved with a chiral NAD(P)H-model compound in the presence of magnesium perchlorate which represses a side reaction catalyzed by a base.
NEW REAGENTS FOR THE SYNTHESIS OF α,β-UNSATURATED ESTERS: LITHIATED O-ALKYL S-ETHOXYCARBONYLMETHYL DITHIOCARBONATE AND THIOCARBONATE
Authors: Tanaka Kazuhiko , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

α,β-Unsaturated esters have been easily synthesized in good yields by treating carbonyl compounds with O-alkyl S-ethoxycarbonylmethyl dithiocarbonates or thiocarbonate in the presence of lithium diisopropylamide. The key intermediates for the synthesis of the recently isolated boll weevil sex pheromone were prepared in good yields by this method.
ASYMMETRIC TRANSAMINATION FROM AMINO ACID (III) ASYMMETRIC SYNTHESIS OF PHENYLGLYCINE BY CHEMICAL TRANSAMINATION FROM OPTICALLY ACTIVE AMINO ACIDS TO BENZALDEHYDE
Authors: Yamada Shun-ichi , Hashimoto Shun-ichi
Published: July 2006

d-Phenylglycine, an important constituent of penicillin and cephalosporin antibiotics, was asymmetrically synthesized by hydrocyanation of the Schiff bases prepared from benzaldehyde and l-amino acid t-butyl esters, followed by oxidative decarboxylation. When l-ψ-leucine t-butyl ester was used as a chiral reagent, the optical yield of d-phenylglycine Increased to 96.5%.
REGIOSPECIFIC ALDOL SYNTHESIS. THE GENERATION OF ACTIVE ENOLATES BY THE REDUCTION OF 2,2,2-TRICHLOROETHYL ESTERS OF α-SUBSTITUTED-β-KETO ACIDS WITH Zn
Authors: Mukaiyama Teruaki , Sato Toshio , Suzuki Seiji , Inoue Tan , Nakamura Hideo
Published: July 2006

α-Substituted-β-keto acid 2,2,2-trichloroethyl esters reacted with aldehydes regiospecifically at α-carbon to the ester carbonyl in the presence of Zn to give the corresponding aldols in good yields.
ACTIVITY OF Ni–P CATALYST FOR THE DEHYDROGENATION OF METHYLCYCLOHEXANE
Authors: Nozaki Fumio , Sekura Takashi , Kawai Masaji
Published: July 2006

The Ni-P catalyst prepared by reduction of Ni3(PO4)2 in hydrogen promoted selectively the dehydrogenation of methylcyclohexane to toluene. The repeated reoxidation-reduction of the catalyst resulted in an increase in dehydrogenation activity.
THE SYNTHESIS OF α,γ-DINUCLEOSIDE TRIPHOSPHATES. THE CONFRONTED NUCLEOTIDE STRUCTURE FOUND AT THE 5′-TERMINUS OF EUKARYOTE MESSENGER RIBONUCLEIC ACID
Authors: Hata Tsujiaki , Nakagawa Iwao , Shimotohno Kunitada , Miura Kin-ichiro
Published: July 2006

α,γ-Dinucleoside triphosphates showing the recently discovered modified structure at the 5′-terminus of eukaryote mRNA were synthesized by use of a new method employing di-n-butylphosphinothioyl bromide.
TOTAL SYNTHESIS OF (±)-NORKETOTRICHODIENE
Authors: Yamakawa Koji , Sakaguchi Reiji , Nakamura Tadaharu , Watanabe Kensuke
Published: July 2006

The total synthesis of (±)-norketotrichodiene (14) is described. The photocycloaddition reaction of 3,6-dimethylcyclohexenone and cyclotene afforded the tricyclo[4.3.23,5.O1,6]undecane derivatives (4 and 5). The retro-aldol reaction of (4) with alkali gave triketone (6a), which was converted to the tosylate (6b). Catalytic hydrogenolysis of (6b) yielded the ketol (10). Treatment of (10) with POCl3-pyridine gave (±)-norketotrichodiene (14) which was identical with the norketone (14) derived from (+)-trichodiene (1).
CYCLOPHANES VI. TEMPERATURE DEPENDENT CONFORMATIONS OF 3,6-DIKETO[8](1,4)NAPHTHALENEOPHANE AND 3,6-DIKETO[8] (2,5)FURANOPHANE
Authors: Haley James F , Keehn Philip M
Published: July 2006

A temperature dependent conformational change in the aliphatic chain of 3,6-diketo[8]naphthalenophane is observed by variable temperature nuclear magnetic resonance spectroscopy; the energy of activation for the process is 9.4±0.2 Kcal/mole. For 3,6-diketo[8](2,5)furanophane the conformational change of the chain is more facile than that of the ring with a conservative upper limit for ring rotation of about 9.1 Kcal/mole.
ROLES OF TITANIUM COMPLEX IN THE CATALYTIC HYDROMETALATION AND ISOMERIZATION OF OLEFINS
Authors: Isagawa Kakuzo , Tatsumi Kimio , Kosugi Hiroaki , Otsuji Yoshio
Published: July 2006

The reaction of Cp2TiCl2 with LiAlH4 forms the complex Cp2Ti(AlH3)2 [1] with the evolution of H2. Treatment of [1] with 1-octene gave the isolable titanium complex which was characterized as [Cp2Ti(AlH3)2][C6H13CH=CH2] [2a]. The roles of [1] and [2a] in the catalytic hydrometalation and the catalytic isomerization of olefins are discussed.
ELECTROREDUCTIVE ACYLATION OF BENZYL CHLORIDE AND RELATED COMPOUNDS WITH ACID CHLORIDES
Authors: Shono Tatsuya , Nishiguchi Ikuzo , Ohmizu Hiroshi
Published: July 2006

The electroreduction of benzyl chloride and related compounds in the presence of acid chlorides gave alkyl benzyl ketones in moderate yields. The controlled potential electrolysis suggests that the electron transfer from the cathode to benzyl chloride yielding an anionic species is the initiation step of this reductive acylation.
PHOTOCYCLOADDITION BETWEEN INDENE AND ELECTRON-RICH OLEFINS THROUGH INDENE CATION RADICAL
Authors: Mizuno Kazuhiko , Kaji Ryoji , Otsuji Yoshio
Published: July 2006

Irradiation of a solution of indene and alkyl vinyl ethers in acetonitrile in the presence of 1-naphthonitrile efficiently gave two stereo-isomeric (2+2) cycloadducts; endo-2-alkoxy-2a,7a-dihydro-7H-cyclobut [a] indene and the corresponding exo-isomer. The quenching and sensitizing experiments suggested that the above cycloadducts were formed via indene cation radical.
DIKETENE AS A 3-BUTENOIC ACID SYNTHON IN TRANSITION METAL-CATALYZED ALKYLATION OF A TRIMETHYLSILYLMETHYL GRIGNARD REAGENT
Authors: Itoh Kenji , Yogo Toshinobu , Ishii Yoshio
Published: July 2006

The reaction of (CH3)3SiCH2MgCl with diketene yields 3-trimethylsilylmethyl-3-butenoic acid (1) in the presence of a catalytic amount of NiCl2(95%), PdCl2(68%), CoCl3(60%), or CuI(20%) under moderate conditions. The acid, 1, is isomerized to the conjugated acid, 4-trimethylsilyl-3-methyl-2-butenoic acid (2) by means of an excess LiN(SiMe3)2. The rearrangement proceeds stereoselectively to 2-(E) isomer by addition of diglyme or N,N,N′,N′-tetramethylethylenediamine. This is the first example of the vinyl-oxygen bond cleavage of diketene.
REVISION OF STRUCTURE OF PETASITOLIDES BY THE SYNTHESIS OF 3β-AND 3α-HYDR0XY- AND 2β-SENECIOYLOXYEREMOPHILENOLIDES
Authors: Kitahara Yoshio , Maeda Shuichi , Ueno Masako , Funamizu Makoto , Kato Tadahiro , Novotný L , Herout V , Šorm F
Published: July 2006

3-Hydroxy-(I, X = β- and α-OH; Y = H) and 2 β-senecioyloxy-(I, X = H; Y = OCOCH=CMe2) eremophilenolides were synthesized stereoselectively starting from ethylenedioxy octalone derivative (II, X = H2). The present synthetic study demonstrates unequivocally that the positions of ester groups of petasitolides should be located at C2- rather than C3- exposition.
THE REACTION OF DIARALKYLGLYCINES: PREPARATION AND CHEMISTRY OF N-CHLOROMETHYLDIBENZYLAMINE HYDROCHLORIDE
Authors: Kimura Masaru , Satake Kyosuke , Morosawa Shiro
Published: July 2006

N-Chloromethyldibenzylamine hydrochloride (2a), which is a precursor to N,N-dibenzylimminium salt (3), was obtained from N,N-dibenzylglycine hydrochloride (1a) in the presence of PCl5 or (COCl)2 in good yields. The reaction mechanism is discussed. 2a was isolated and reacted with dibenzylamine (6a), thiophene, n-buthyllithium and 1-naphthol to give an excellent yield of bis(N,N-dibenzylamino)methane (5a), 2-(N,N-dibenzylaminomethyl)thiophene (7), N-penthyldibenzylamine (8), and 2-dibenzylaminomethyl-1-naphthol (9), respectively.
THE FORM OF SULFIDE ON MOLYBDENUM OXIDE CATALYST
Authors: Sotani Noriyuki
Published: July 2006

Molybdenum oxide catalyst is sulfurized during the hydrodesulfurization reaction. The catalyst was studied by EMX and ESCA. Sulfur was mainly contained as MoS2. Mo/S mole ratio of the catalyst was 1.5–3.4 by ESCA and 5.7 by chemical analysis. This means that sulfide is mainly distributed on the surface or near the surface.
INTRAMOLECULAR CHARGE-TRANSFER INTERACTION BETWEEN LONE PAIR ELECTRONS AND π-ELECTRON SYSTEM
Authors: Mutai Kiyoshi , Kobayashi Keiji , Kobayashi Tsunetoshi , Utsunomiya Chikatoshi
Published: July 2006

As a model for detecting the intramolecular n-π type charge-transfer interaction, a homologous series of the compounds 3 was chosen and subjected to ultraviolet, fluorescence, and photoelectron spectroscopic study. The interaction was confirmed in the lower homologs of n=1, 2, and 3.
A GENERAL SYNTHESIS OF 4-HYDROXY-2-ALKYLCYCLOPENTENONES
Authors: Shono Tatsuya , Hamaguchi Hiroshi , Aoki Kei
Published: July 2006

The electrooxidation of t-butyl 2-furylacetate (2) yielded dimethoxy dihydrofuran (3), which was transformed by hydrolysis to 4-hydroxy-5-carbo-t-butoxycyclopentenone (4). The reaction of the cyclopentenone with alkyl halides, followed by the decarboxylation and rearrangement afforded the 4-hydroxy-2-alkylcyclopentenone (1), one of which was the PGE2 precursor.
RAPID PEPTIDE SYNTHESIS IN LIQUID PHASE. PREPARATION OF ANGIOTENSIN II AS AN EXAMPLE
Authors: Nozaki Sukekatsu , Kimura Atsuko , Muramatsu Ichiro
Published: July 2006

A rapid method of peptide synthesis is proposed. In this method a peptide chain is stepwise elongated in a water-immiscible organic solvent without isolation of the intermediates. Protected angiotensin II was prepared by the method in an overall yield of 74% in a short period of time.
A PHOTOREARRANGEMENT OF 6-METHYLENETRICYCLO[3.2.1.02,7]OCT-3-EN-8-ONE OXIME DERIVATIVES: DI-π-METHANE TYPE REARRANGEMENT INVOLVING AN OXIME MOIETY
Authors: Nitta Makoto , Inoue Osamu , Tada Masaru
Published: July 2006

6-Methylenetricyclo[3.2.1.02,7]oct-3-en-8-one oxime derivatives (Ia) and (Ib), upon irradiation, afforded 3-methylenetetracyclo[3.3.0.0.2,804,6]octan-8-one oxime derivatives (IIa), (IIIa) and (IIb), respectively. The photorearrangement leading to IIa and IIb were ascribed to a novel di-π-methane type rearrangement involving the oxime moiety.
HOMOGENEOUS HYDROGENATION OF ALDEHYDES TO ALCOHOLS CATALYZED BY RuCl2(PPh3)3
Authors: Tsuji Jiro , Suzuki Hirohisa
Published: July 2006

RuCl2(PPh3)3 was found to be a good catalyst for the hydrogenation of aliphatic aldehydes to alcohols under mild conditions. Aromatic aldehydes were reduced to benzyl alcohols without hydrogenolysis. Ketones and nitro groups were not reduced under the same conditions.
REDUCTION OF PYRIDINIUM AND CARBONYL COMPOUNDS BY REFLUXING SODIUM DITHIONITE SOLUTIONS
Authors: Minato Hiroshi , Fujie Shinichi , Okuma Kentaro , Kobayashi Michio
Published: July 2006

Sodium dithionite in refluxing MeOH–H2O was found to be an effective reducing agent for converting pyridinium ions to piperidines and carbonyl compounds to alcohols, respectively.
PHOTOLYSIS OF 2-AZA-3-ARYL-1,4-NAPHTHOQUINONES IN THE PRESENCE OF HYDROGEN DONORS
Authors: Maruyama Kazuhiro , Iwai Tatsuaki , Otsuki Tetsuo , Naruta Yoshinori , Miyagi Yo
Published: July 2006

Photochemical reaction of 2-aza-3-phenyl-1,4-naphthoquinone and two derivatives 4 with a variety of hydrogen donors was investigated. Depending on the nature of hydrogen donors, (i) addition products 1 of hydrogen donor to the carbon–nitrogen double bond, (ii) hydrogenation products 2 of the (Remark: Graphics omitted.)C=N– double bond, and (iii) ring contracted addition products 3 were obtained, but their yields are not of satisfactory.
ELECTROCATALYTIC BEHAVIOR OF TETRASULFONATED METAL PHTHALOCYANINES IN THE REDUCTION OF CARBON DIOXIDE
Authors: Hiratsuka Kazuya , Takahashi Katsuhiro , Sasaki Hideo , Toshima Shinobu
Published: July 2006

In the electroreduction of carbon dioxide, catalytic activities of the tetrasulfonated metal phthalocyanines(MeTSP) homogeneously dissolved in the Clark–Lubs buffer solutions were investigated by the measurements of current- and capacitance-potential curves. It was found that CoTSP and NiTSP were active but not CuTSP and FeTSP.
PREPARATION OF POLYPEPTIDE MODEL FOR VISUAL PIGMENTS
Authors: Nanasawa Masato , Kamogawa Hiroyoshi
Published: July 2006

Schiff base(SB) of apocarotenal and copolypeptide (γ-methyl-l-glutamate and l-lysine) was prepared for the purpose of simulating visual pigments. The charge transfer(CT) complexes of conjugated side chains of the resulting polypeptide-SB were formed with various electron acceptors, bringing about a 120-nm shift of absorption band as recoginized in rhodopsin.
NMR AND CD SPECTRAL STUDIES OF CONFORMATIONAL ISOMERS OF ISOLIGULARONE AND FUKINONE, NATURALLY OCCURRING cis-DECALIN DERIVATIVES
Authors: Sato Toshichika , Tada Masahiro , Takahashi Takeyoshi , Horibe Isao , Ishii Hiroshi , Iwata Tatsuo , Kuriyama Kaoru , Tamura Youko , Tori Kazuo
Published: July 2006

NMR and CD spectroscopic evidence showed that cis-decalin types of sesquiterpenic ketones, isoligularone (2) and fukinone (3), predominantly adopt “steroid-like” conformations in solution in contrast with ligularone (1) which prefers the “non-steroid-like” one. 13C NMR signal assignments and anomalies in the CD of the furanoketones are also reported.
PHOTOCHEMICAL REACTIONS OF 3-PHENYL-2-ISOXAZOLINES FUSED WITH CYCLOALKANE RING
Authors: Seshimoto Osamu , Kumagai Tsutomu , Shimizu Kazuo , Mukai Toshio
Published: July 2006

In order to clarify the initial stage of the photoexcitation of the rigid Ph–C=N–O system, the photochemistry of several 2-isoxazolines possessing fused cycloalkane ring has been investigated. Several photoproducts such as 2H-azirine, cyclic enamine aldehydes, bicyclic oxazolines were isolated, and a generalized pattern of the photoreaction which is initiated by the N–O bond fission is proposed.
PRESSURE-VOLUME-TEMPERATURE RELATIONS IN THE LIQUID CRYSTAL OF p-PENTOXYBENZILIDENE-p-n-BUTYLANILINE
Authors: Hanawa Chikayoshi , Shirakawa Toshiaki , Tokuda Taneki
Published: July 2006

Pressure-volume-temperature relationships were determined using the piston-cylinder methods for a liquid crystal, p-pentoxybenzilidene-p-n-butylaniline. For the nematic state, the intermolecular potential was found to be dependent on 3.6 powers of the density.
PERMANGANATE-OXIDATION OF PEPTIDES. I. THE OXIDATION OF PROLINE RESIDUE IN N-PROTECTED PROLINE TO PYROGLUTAMYL RESIDUE
Authors: Muramatsu Ichiro , Motoki Yoshiaki , Yabuuchi Kimihiro , Komachi Hiroshi
Published: July 2006

The oxidation of N-protected proline and related compounds with permanganate was investigated. The proline residue in N-acyl-l-proline was readily oxidized in the presence of strong acid to pyroglutamyl residue, in a manner different from that of free proline. In the oxidation of Nδ-benzyloxycarbonyl-l-ornithine under the same conditions, the methylene group adjacent to the protected δ-amino nitrogen was also attacked.
PHOTOELECTROCHEMICAL STUDY OF REVERSIBLE CHARGE SEPARATION IN HYDRATED MAGNESIUM PORPHYRIN AGGREGATES
Authors: Yamamura Takeshi , Umezawa Yoshio
Published: July 2006

A reversible photogalvanic effect was observed with a Pt electrode coated with an aggregate of a hydrated magnesium porphyrin. Quantum efficiencies at each wavelength were obtained from the spectral dependence of the photocurrent. A charge separation responsible for the observed photocurrent was discussed comparatively with the chlorophyll system.
CROWN ETHERS IN ORGANIC SYNTHESIS. II. CATALYTIC DEHYDRATION OF ALDOXIMES
Authors: Rasmussen Jerald K
Published: July 2006

Phase transfer (crown ether or quaternary ammonium salt) catalyzed reaction of benzaldoxime with potassium salts (cyanide or halide) produces a 3:1 mixture of benzonitrile and benzamide. A base-catalyzed mechanism is proposed. Extension of the procedure to provide a general, one-pot conversion of aldehydes to nitriles is indicated.
REVERSIBLE HYDRIDE TRANSFER FROM 1-METHYL-1,4-DIHYDRONICOTINAMIDE (1,4-MeNDH) TO MeND+ IODIDE YIELDING 1,6-MeNDH
Authors: Minato Hiroshi , Ito Takao , Kobayashi Michio
Published: July 2006

The reaction of 1-methyl-1,4-dihydronicotinamide (1,4-MeNDH) with MeND+ in D2O at 34°C was found to yield 1,6-MeNDH, and the reaction of 1,6-MeNDH with MeND+ was found to yield 1,4-MeNDH. An equilibrium was established between 1,6-MeNDH(18%) and 1,4-MeNDH(82%) when either of the 1-methyldihydronicotinamides was mixed with a catalytic amount of MeND+.
POPCORN POLYMERIZATION OF 3,5-DIMETHYLSTYRENE
Authors: Yamamoto Seika , Tatsumi Masakazu
Published: July 2006

Occurrence of popcorn polymerization in 3,5-dimethylstyrene (DMS) without any seed was found. Methyl methacrylate (MMA) and methyl acrylate (MA), in which small amounts of DMS popcorn polymer were employed as a seed, caused popcorn polymerization.
α-HALO-β-DICARBONYL COMPOUNDS. NOVEL CARBOXYL PROTECTING REAGENTS
Authors: Ishimaru Toshiyasu , Ikeda Hitoshi , Hatamura Mariko , Nitta Hajime , Hatanaka Minoru
Published: July 2006

α-Halo-β-dicarbonyl compounds are useful reagents for the protection of carboxylic acids, particularly penicillin 3-carboxylic acid. The protected carboxylic acids can be successfully converted into the free acids by treatment with nitrosating reagents such as sodium nitrite and alkyl nitrite. The probable mechanism of this deprotection is also described.
A KINETIC METHOD FOR THE DETERMINATION OF ASCORBIC ACID WITH 2,6-DICHLOROPHENOLINDOPHENOL
Authors: Hiromi Keitaro , Fujimori Haruko , Yamaguchi-Ito Junko , Nakatani Hiroshi , Ohnishi Masatake , Tonomura Ben’ichiro
Published: July 2006

A kinetic method for the determination of ascorbic acid is described. The method is based on the linear relationship, in a wide range, between the apparent first-order rate constant, kapp, of the reduction of 2,6-dichlorophenolindophenol by ascorbic acid and the concentration of ascorbic acid. The method is sensitive, specific, and applicable to turbid or colored samples.
A NEW METHOD FOR THE PREPARATION OF ISOCYANATES FROM METHYL THIOCARBAMATES BY THE USE OF 2-CHLOROBENZOXAZOLIUM SALT
Authors: Echigo Yoshiaki , Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

Treatment of methyl thiocarbamates with 2-chloro-3-ethylbenzoxazolium tetrafluoroborate and triethylamine at room temperature affords isocyanates in good yields under neutral condition.
SYNTHESIS OF CARBOXYLIC ESTERS FROM ALKYL HALIDES AND ALKOXIDES USING PENTACARBONYLIRON AS A CARBONYLATING REAGENT
Authors: Yamashita Masakazu , Mizushima Kiyoshi , Watanabe Yoshihisa , Mitsudo Take-aki , Takegami Yoshinobu
Published: July 2006

Carboxylic esters were prepared under mild conditions in high yields from alkyl halides and alkoxides using pentacarbonyliron as a carbonylating reagent.
THE EFFECT OF PYRIDINIUM ION ON POSITRON ANNIHILATION IN AQUEOUS SOLUTIONS
Authors: Ujihira Yusuke , Kobayashi Yoshinori , Nomizu Tsutomu
Published: July 2006

Positron lifetime measurements in aqueous solutions of pyridine-hydrochloric acid at various solute concentrations revealed that pyridinium ion, formed by Py + H+\ightleftharpoons [PyH]+ reduced the relative intensity of ortho-positronium(I2) without changing ortho-positronium lifetime(τ2) significantly. Comparison of the result with that of anilinium ion suggested that the presence of pyridine ring, whose π electron density is lower than that of benzene, is an important point for the reduction of I2.
APPLICATION OF MASS SPECTRA OF IONS WITH EXCESS KINETIC ENERGY TO THE ISOTOPE-LABELLING TECHNIQUE FOR ORGANIC CHEMISTRY
Authors: Tsuchiya Masahiko
Published: July 2006

Precursors of ions with excess kinetic energy (KE ions) have higher internal energy than those of ordinary ions (thermal ions), so that rearrangement reactions like H/D scrambling may be less probable in the mass spectra of KE ions. For example, the location and number of deuterium atoms in 1,4-butanediol-2,2,3,3-d4 has been correctly indicated by the mass spectrum of KE ions, while the ordinary mass spectrum gives no reliable information because of rearrangement. Information obtained from mass spectrum of KE ions has also been described.
CARBON 13 SPIN-LATTICE RELAXATION TIMES OF THE INCLUSION COMPLEX OF β-CYCLODEXTRIN WITH SULFATHIAZOLE IN AQUEOUS SOLUTION
Authors: Uekama Kaneto , Hirayama Fumitoshi , Koinuma Hideomi
Published: July 2006

Carbon 13 spin-lattice relaxation times for inclusion complex of β-cyclodextrin with sulfothiazole in aqueous solution have been measured by an inversion-recovery method. The reduction of molecular motions and changes in carbon 13 chemical shifts in both species suggest a predominantly hydrophobic interaction.
THE REACTIONS OF BIS(TRIMETHYLSILYL) HYPOPHOSPHITE WITH CARBONYL COMPOUNDS
Authors: Hata Tsujiaki , Mori Hiroyuki , Sekine Mitsuo
Published: July 2006

Bis(trimethylsilyl) hypophosphite, generated in situ from hypophosphorous acid and silylating agents such as trimethylsilyl chloride in the presence of triethylamine or bis(trimethylsilyl)acetamide, reacted with carbonyl compounds to give the carbonyl adducts, which were successfully converted to anilinium salt of the corresponding phosphonous acids by treatment with aniline-containing ethanol.
TWO NEW BROMOPHENOLS FROM THE RED ALGA, RHODOMELA LARIX
Authors: Kurata Kazuya , Amiya Takashi
Published: July 2006

Two new bromophenols, 2,2′,3,3′-tetrabromo-4,4′,5,5′-tetrahydroxydiphenylmethane and 2,2′,3-tribromo-3′,4,4′,5-tetrahydroxy-6′-methoxymethyldiphenylmethane have been isolated from the red alga, Rhodomela larix.
OXIDATIVE DECYANATION OF PHENYLACETONITRILES WITH MOLECULAR OXYGEN IN AQUEOUS MEDIUM
Authors: Masuyama Yoshiro , Ueno Yoshio , Okawara Makoto
Published: July 2006

The alkylation of phenylacetonitrile (1) followed by the oxidative decyanation using molecular oxygen in aqueous alkali gave alkyl phenyl ketones (3).
MOLECULAR STRUCTURE OF η3-[(trans-1,2-DIMETHOXYCARBONYLVINYL)METHOXYCARBENE]TRICARBONYLIRON(0), A NOVEL COMPLEX CONTAINING THREE-CARBON FOUR-ELECTRON LIGAND, η3-VINYLCARBENE
Authors: Nakatsu Kazumi , Mitsudo Take-aki , Nakanishi Hiroshi , Watanabe Yoshihisa , Takegami Yoshinobu
Published: July 2006

X-ray structure determination of the title complex, [(OC)3FeC(OMe)–C(COOMe)=CH(COOMe)], reveals that the η3-vinylcarbene ligand coordinates to Fe with both the C=C group and the carbene C atom. The short Fe–C(carbene) length of 1.819(3) Å suggests some partial double bond character to its bond.
A SELECTIVE ESTER-EXCHANGE REACTION IN THE COPPER(II) CHELATE OF THE SCHIFF BASE DERIVED FROM SALICYLALDEHYDE AND DIBENZYLASPARTATE
Authors: Nakao Yasuo , Nakahara Akitsugu
Published: July 2006

Upon refluxing a solution of bis(N-salicylidenedibenzyl-Dl-aspartato)copper(II), 1, in methanol, bis(N-salicylidene-α-methyl-β-benzyl-Dl-aspartato)copper(II) 2, was obtained in a 63% yield, suggesting that an ester-exchange reaction occurred preferably at the α-position of the aspartate.
REACTIONS OF CYTOTOXIC NOR-DITERPENOID DILACTONES IN PODOCARPUS NAGI: MODIFICATIONS OF RING A FUNCTIONAL GROUPS
Authors: Hayashi Yuji , Matsumoto Takeshi , Hyono Toshiaki , Sakan Takeo
Published: July 2006

Chemical modifications of the ring A functional groups on the biologically active nor-diterpenoid dilactones of Podocarpus plants are described. Some results obtained here are different from the reported unusual properties of these unique compounds.
NOVEL THREE- AND ONE-CARBON RING EXPANSION REACTIONS OF A FIVE MEMBERED CARBOCYCLIC COMPOUND
Authors: Tsuzuki Kazuo , Hashimoto Hisanobu , Shirahama Haruhisa , Matsumoto Takeshi
Published: July 2006

Ethyl 2-oxo-1-(2-oxopropyl)-1-cyclopentanecarboxylate, on treatment with tBuOH-tBuOK at rt (1h), affords unusual ring expansion products ethyl 3,5-dioxo-1-cyclooctanecarboxylate, ethyl 4-acetyl-3-oxo-1-cyclohexanecarboxylate and ethyl 2-acetyl-3-oxo-1-cyclohexanecarboxylate in 19, 40 and 12% yields, respectively.
ISOLATION OF RADICAL ANION OF ALLOXAN DERIVED FROM THE REACTIONS OF ALLOXAN OR ALLOXANTIN WITH 1-BENZYL-1,4-DIHYDRONICOTINAMIDE
Authors: Endo Takeshi , Okawara Makoto
Published: July 2006

Radical anion of alloxan could be isolated as 1-benzyl-3-carbamoylpyridinium salt (III) by the reactions of 1-benzyl-1,4-dihydronicotinamide with alloxan or alloxantin (II). III was also prepared by the reactions of II with 1-benzyl-3-carbamoylpyridinium chloride.
REACTION OF AZINES WITH DIPHENYLCYCLOPROPENONE. SYNTHESIS OF 5-ARYL-2, 3-DIPHENYL-Δ2-PYRROLIN-4-ONES
Authors: Takahashi Masahiko , Yamaguchi Shin-ichi , Igari Norio
Published: July 2006

The reactions of aromatic aldehyde azines with diphenylcyclopropenone in refluxing toluene afforded 5-aryl-2, 3-diphenyl-Δ2-pyrrolin-4-ones in moderate yields.
SYNTHESIS OF 5-(1,3-DITHIOL-2-YLIDENE)-3,6-CYCLOHEPTADIENE-1,2-DIONE (OR 7,10-DITHIASESQUIFULVALENE-3,4-QUINONE) DERIVATIVES
Authors: Takahashi Kazuko , Morita Kazuyoshi , Takase Kahei
Published: July 2006

8-Phenyl-7,10-dithiasesquifulvalene-3,4-quinone (7a) and its halogen derivatives (7b and 7c) are synthesized. Although their IR and NMR data suggest a contribution of dipolar structure (7″) to the ground state, the solvent effect on the 1st bands in their ES showed a larger contribution of 7″ to the excited state rather than the ground state.
13C NMR SPECTRUM AND SPIN-LATTICE RELAXATION TIMES (T1) OF A [14]ANNULENO[14]ANNULENE DERIVATIVE AND THE SIGNAL ASSIGNMENTS BY THE T1 METHOD
Authors: Nakanishi Hiroshi , Akiyama Shuzo , Nakagawa Masazumi
Published: July 2006

13C NMR spectrum of a [14]annuleno[14]annulene derivative (1) and the spin-lattice relaxation times (T1) were studied. The assignments of the signals of four quaternary ring carbons were successfully made by comparing the observed T1’s with the calculated ones. The chemical shifts of 1 were compared with those of corresponding [14] and [22]annulene derivatives.
SYNTHESIS OF 7-HYDROXYPHTHALIDES STARTING FROM UNSATURATED LACTONES VIA 2-TRIALKYLSILOXYFURANS
Authors: Asaoka Morio , Miyake Kazutoshi , Takei Hisashi
Published: July 2006

Diels–Alder adducts of maleic anhydride and 2-trialkylsiloxy furans, prepared from unsaturated lactones and trialkylchlorosilane in high yields, afforded 3-hydroxyphthalic anhydrides on treatment with hydrobromic acid. The anhydrides were regiospecifically reduced to 7-hydroxyphthalides in high yields by means of excess sodium borohydride in alcohol.
AN ORIGIN FOR NONEQUIVALENCY OF CARBONS CONSTITUTING ROTATIONAL AXES IN 13C NMR SPECTRA: A CASE OF ROTAMERIC 9-(o-ALKYLPHENYL)FLUORENES
Authors: Nakamura Mikio , Nakamura Nobuo , Oki Michinori
Published: July 2006

The difference in chemical shifts of 9-C in ap and sp forms of 9-(o-alkylphenyl)fluorenes increases as the size of the alkyl groups increases. The change in the difference is correlated with 1JCH and is discussed on the ground of bond angle deformation.
NEW SYNTHETIC METHOD OF 5- AND 2,5-SUBSTITUTED 3-FUROATES, AND 1,4-DICARBONYL COMPOUNDS FROM UNSATURATED LACTONES
Authors: Asaoka Morio , Sugimura Naoyuki , Takei Hisashi
Published: July 2006

The title compounds were synthesized from 4-substituted 2-(1′-ethoxyalkylidene)-3-buten-4-olides 3, obtained by the reaction of 4-substituted 2- or 3-buten-4-olides with ortho esters and acetic anhydride.
A SIMPLE METHOD FOR MEASURING THE TRANSLATIONAL ENERGY OF IONS WITH AN ANALYTICAL MASS SPECTROMETER
Authors: Tajima Susumu , Sato Takeshi , Yanagisawa Tamae , Azami Tadashige , Tsuchiya Toshikazu
Published: July 2006

The average translational energy of ions has been readily measured by applying a variable retarding potential of negative voltage to the repeller electrode. The measured value of the methyl ion from acetonitrile at the threshold is in fair agreement with that in literature.
LÖSUNGSMITTELEINFLUSS BEI DER DIMERISIERUNG DES BUTADIENS UND BEI DER REAKTION VON BUTADIEN MIT CYCLOPENTADIEN
Authors: Nakagawa Kiyoshi , Ishii Yasutaka , Ogawa Masaya
Published: July 2006

Der Lösungsmitteleinfluss auf die Reaktionsgeschwindigkeiten der Dimerisierung des Butadiens und der Reaktion von Butadien mit Cyclopentadien wurde untersucht. Der unerwartete negative Einfluss der Lösungsmittelpolarität spricht dafür, dass es bei den von uns untersuchten Diels–Alder-Reaktionen in polaren Lösungsmitteln einer Entsolvatationsenergie bedarf.
FISH BIOLUMINESCENCE I. ISOLATION OF A LUMINESCENT SUBSTANCE FROM A MYCTOPHINA FISH, NEOSCOPELUS MICROCHIR, AND IDENTIFICATION OF IT AS OPLOPHORUS LUCIFERIN
Authors: Inoue Shoji , Okada Kunisuke , Kakoi Hisae , Goto Toshio
Published: July 2006

A luminescent substance was isolated from liver of N. microchir. It was proved to be identical with Oplophorus luciferin.
SQUID BIOLUMINESCENCE IV. ISOLATION AND STRUCTURAL ELUCIDATION OF WATASENIA DEHYDROPRELUCIFERIN
Authors: Inoue Shoji , Taguchi Hiroyasu , Murata Mikiko , Kakoi Hisae , Goto Toshio
Published: July 2006

Watasenia dehydropreluciferin was isolated from livers of Watasenia scintillans. Its structure was determined as Ia rather than Ib. Sodium borohydride reduction of Ia gave Watasenia preluciferin (IV).
MOLECULAR STRUCTURES OF DONOR–ACCEPTOR COMPLEXES OF BORON TRIFLUORIDE WITH TRIMETHYLAMINE AND DIMETHYLETHER
Authors: Shibata Shuzo , Iijima Kinya
Published: July 2006

The molecular structures of (CH3)3N·BF3 and (CH3)2O·BF3 were determined by electron diffraction. Both molecules were found to have a staggered form with rg(N–B) = 1.673 ± 0.006 Å, rg(O–B) = 1.719 ± 0.023 Å. The other molecular parameters for the complexes were compared with those for their donors and acceptor.
SYNTHESES AND SOME CHARACTERIZATION OF 3,5,7-CYCLOOCTATRIENE-1,2-DIONE AND ITS 3-BROMO DERIVATIVE
Authors: Oda Masaji , Oda Mitsunori , Miyakoshi Shoichi , Kitahara Yoshio
Published: July 2006

3,5,7-Cyclooctatriene-1,2-dione 1, a labile substance, is synthesized from 7-bromo-3,5-cyclooctadiene-1,2-dione by dehydrobromination and characterized by 1H-NMR spectrum and some chemical reactions. The formation of 3-bromo derivative 3 is also demonstrated mainly by means of 1H-NMR spectroscopy.
EQUILIBRATION OF METHYL 3-OXO-CIS-, 10-OXO-CIS-AND 10-OXO-TRANS-CYCLOUNDEC-1-ENECARBOXYLATES
Authors: Marchesini A , Paronzini M , Pagnoni U M
Published: July 2006

Methyl 3-oxo-cis-cycloundec-1-enecarboxylate (3) and the corresponding Δ3-isomers, methyl 10-oxo-cis- and 10-oxo-trans-cycloundec-1-enecarboxylates (5) and (4), were synthesized. Equilibration using 1,5-diazabicyclo [4.3.0]non-5-ene as a basic catalyst gave very different results in comparison with those reported for analogous systems with 7–10 membered ring.
A NOVEL BASE-CATALYZED REARRANGEMENT OF p-PEROXYQUINOL ESTERS
Authors: Nishinaga Akira , Nakamura Koichi , Yoshida Kaoru , Matsuura Teruo
Published: July 2006

The p-peroxyquinol esters derived from the base-catalyzed oxygenation of 4-alkyl-2,6-di-t-butylphenols (alkyl=R1) followed by the Schotten–Baumann acylation (R2COCl) undergo a novel base-catalyzed rearrangement with t-BuOK in DMF to give p-quinoxyacetic acid derivatives in excellent yields. A mechanism involving the initiation by the homolysis of O–O bond is discussed.
SELECTIVE FORMATION OF BUTADIENE IN CHLORINATION OF BUTENES THROUGH MOLTEN SALTS
Authors: Kikkawa Shoichi , Nomura Masakatsu , Shimizu Michimasa
Published: July 2006

The reaction of three butenes with chlorine through ZnCl2–KCl–NaCl melts yielded selectively butadiene at 450°C while chlorination through CuCl–KCl–NaCl melts and thermal chlorination produced considerable amounts of C4H7Cl and C4H8Cl2 along with expected butadiene.
SYNTHESIS OF E-TYPE 7-THIAPROSTAGLANDINS
Authors: Kurozumi Seizi , Toru Takeshi , Kobayashi Makiko , Hashimoto Yoshinobu
Published: July 2006

2-Alkylthiocyclopent-2-en-1-one derivative was prepared from cyclopent-2-en-1-one. From this intermediate, E-type 7-thiaprostaglandins were synthesized by conjugate addition of lithium organocuprates.
POLARIZED TRIPLET–TRIPLET ABSORPTION SPECTRUM USING STRETCHED POLYMER FILM AT LIQUID NITROGEN TEMPERATURE: DIPHENYLACETYLENE
Authors: Hoshi Toshihiko , Ota Kazuo , Yoshino Junko , Murofushi Kiyoshi , Tanizaki Yoshie
Published: July 2006

Measurements of a polarized triplet–triplet absorption spectrum using stretched polymer films have been attempted at liquid nitrogen temperature. The polarizations of the triplet–triplet transitions of diphenylacetylene were determined, and the molecular structure in the excited triplet state was discussed.
STRUCTURAL STUDY OF OPTICAL RESOLUTION V. THE CRYSTAL STRUCTURE OF HYDROGEN TRIS(ETHYLENEDIAMINE)COBALT(III) d-TARTRATE TRIHYDRATE
Authors: Tada Toshiji , Kushi Yoshihiko , Yoneda Hayami
Published: July 2006

A new diastereoisomeric salt, H(+)589–[Co(en)3](d-tart)2·3H2O, has been prepared, and complete resolution of racemic [Co(en)3]3+ cation has been effected by use of this salt. The X-ray structure analysis revealed that this salt has a local “[Co (en)3](d-tart)2” block similar to that previously found in Li(+)589–[Cr(en)3](d-tart)2·3H2O crystal.