bluuebunny/crossref_metadata_2025 huggingface dataset:
SHORT-LIVED HETERONUCLEAR COPPER(II)-XYLENOL ORANGE-COBALT(II) AND COPPER(II)-XYLENOL ORANGE-NICKEL(II) COMPLEXES
Authors: Yamada Mutsuo , Fujimoto Masatoshi
Published: July 2006

Short-lived heteronuclear intermediates [CuII(XO)CoII] and [CuII(XO)NiII] are detected by a rapid-scan spectrophotometer upon mixing Cu2+ ion with a Co(II)- or a Ni(II)-complex of 3,3′-bis [N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein (Xylenol Orange, XO) in weakly acid solution.
A NEW ONE-POT CROSS COUPLING REACTION OF THE GRIGNARD REAGENTS AND ALLYL ALCOHOLS VIA 2-ALLYLOXYPYRIDINIUM SALTS
Authors: Mukaiyama Teruaki , Imaoka Masanori , Izawa Toshio
Published: July 2006

A new one-pot cross coupling reaction of the Grignard reagents and allyl alcohols via 2-allyloxypyridinium salt was investigated. 2-Allyloxy-1-ethyl-4,6-dimethylpyridinium salts, prepared in situ from allyl alcohols and 1-ethyl-2-fluoro-4,6-dimethylpyridinium tetrafluoroborate, reacted easily with the Grignard reagents to afford the corresponding cross coupling products in good yield.
THE STRUCTURE OF KAMEBANIN, A NEW ANTITUMOR ENT-KAURENOID FROM ISODON KAMEBA OKUYAMA
Authors: Kubo Isao , Miura Iwao , Kamikawa Tadao , Isobe Takahiko , Kubota Takashi
Published: July 2006

Chemical investigation of the bitter principles from Isodon Kameba has led to the isolation and characterization of a new ent-kaurenoid diterpene, kamebanin 1, which has in vitro cytotoxicity, in vivo tumor inhibitory, and antibacterial activities.
ONE STEP SYNTHESIS OF 5,2′-BITHIAZOLE DERIVATIVES: REACTION OF N,N-DIMETHYL-2,4-DITHIOBIURET WITH α-HALOKETONES
Authors: Yamamoto Yuichi , Yoda Reiko , Sekine Kyoko
Published: July 2006

Thermal reaction of N,N-dimethyl-2,4-dithiobiuret (1a) with monochloroacetone (2a) in aqueous solution gave 4-methyl-2-(N,N-dimethylthiocarbamoyl)aminothiazole (3a) and 5,2′-bithiazole derivative, 4-methyl-2-dimethylamino-5-(4′-methylthiazol-2′-yl)thiazole (4a). Reaction of (1a) and phenacyl bromide (2b) gave 2-dimethylamino-4-phenyl-5-(4′-phenylthiazol-2′-yl)thiazole (4b) alone in one step and in a good yield.
IMMOBILIZATION OF ENZYME TO GRAFT-POLYMER ON GLASS SURFACE
Authors: Handa Takashi , Goto Sumio , Akino Toshiro
Published: July 2006

The immobilized glucoamylase (from Rhizopus niveus) was prepared by amidination reaction to partially imidoesterized polyacrylonitrile which had been grafted onto flaky glass surface preirradiated by electron-accelerator.
A STUDY OF THE SOLVENT EFFECT OF DIMETHYL SULFOXIMINE ON THE RATES OF SN2 REACTIONS
Authors: Furukawa Naomichi , Takahashi Fujio , Yoshimura Toshiaki , Oae Shigeru
Published: July 2006

Dimethyl sulfoximine was tested as a solvent in the SN2 reactions and was shown to have characteristic features of both protic and polar aprotic solvents. Dimethyl sulfoximine, when used as a mixed solvent with methanol, showed a large rate acceleration of the SN2 reaction likely DMSO or DMF.
σ-CARBON-BONDED COMPLEXES OF PYRIDINES WITH NICKEL(II)
Authors: Isobe Kiyoshi , Nakamura Yukio , Kawaguchi Shinichi
Published: July 2006

Oxidative substitution of tetrakis(triphenylphosphine) nickel(0) with a chloro- or bromo-pyridine takes place in toluene at room temperature to afford a dimeric complex, [NiX(σ-pyridyl) (PPh3)]2. The σ-pyridyl nickel(II) complex is very stable and has a strong preference for the dimeric structure, the bridging ligand being readily replaced by other halide and pseudo halide ions. [NiCl (2σ-C5H4N) (PPh3)]2 acts as a very powerful catalyst for completely selective cross coupling between 2-chloropyridine and methylmagnesium bromide.
CIRCULAR DICHROISM STUDY ON INCLUSION COMPLEXES OF SOME PROSTAGLANDINS WITH α- AND β-CYCLODEXTRINS
Authors: Uekama Kaneto , Hirayama Fumitoshi , Yamasaki Shyukou , Otagiri Masaki , Ikeda Ken
Published: July 2006

The interaction of some prostaglandins with α- and β-cyclodextrins in aqueous solution has been investigated by circular dichroism (CD) spectroscopy. The changes of the intrinsic CD of prostaglandins and the induced CD of cyclopentanone following the binding to cyclodextrins were largely dependent upon the geometry of guest and host molecules.
THE POSSIBLE USE OF MODIFIED TITANIUM AS POSITIVE GRID IN LEAD-ACID BATTERIES
Authors: Iwakura Chiaki , Inai Meguru , Tamura Hideo
Published: July 2006

During the course of studying on DSA-type electrodes, it was found that the ruthenium dioxide coated titanium has a promising character as a positive grid in lead-acid batteries. This paper briefly describes the preliminary works.
SYNTHESES OF CYCLOTETRADEPSIPEPTIDES, AM-TOXIN II AND ITS ANALOG
Authors: Shimohigashi Yasuyuki , Lee Sannamu , Kato Tetsuo , Izumiya Nobuo , Ueno Tamio , Fukami Hiroshi
Published: July 2006

Synthesis of a cyclotetradepsipeptide corresponding to the sequence of AM-toxin II (2a) was achieved, using methanesulfonyl chloride containing sulfur dioxide in the final step of dehydration. The peptide obtained was identical with natural 2a in regard to mp, TLC, UV, MS, ORD, crystal form and biological activity. An analog [l-Phe1]-AM-toxin (2b), simultaneously synthesized, showed extremely weak activity.
BASE-CATALYZED EQUILIBRIUM OF SHYOBUNONE AND RELATED COMPOUNDS
Authors: Niwa Masatake , Iguchi Masanobu , Yamamura Shosuke
Published: July 2006

On treatment with MeONa–MeOH (under reflux, 7–9 h), shyobunone and related compounds were converted into a mixture of six possible isomers (1, 2, 3, 4, 5, and 6), including the starting material, in the following ratio: 1/2/3/4/5/6 = 3 : 6 : 3 : 1 : 7 : 13. In the cases of the corresponding dihydro compounds, six isomers were also obtained in the following ratio remarkably different from that of shyobunone [7/8/9/10/11/12 = 23 : 7 : 14 : 15 : 21 : 19]. The stereostructures and conformations of these compounds are discussed on the basis of their ORD data.
CYCLIZATION REACTIONS BY THE USE OF 1,2-BIS(TRIMETHYLSILYL)IMINO-1,2-DIPHENYLETHANE
Authors: Matsuda Isamu , Takahashi Toshiro , Ishii Yoshio
Published: July 2006

Imidazole (3) or oxazoline (4) derivatives are obtained by the reactions of 1,2-bis(trimethylsilyl)imino-1,2-diphenylethane with carbonyl compounds after thermolysis or methanolysis of the common intermediate (2) of which thermal stability seems to depend on the electronic character of R.
THE ENANTIOSELECTIVE ABILITY OF CHIRAL DIPHOSPHINE–RUTHENIUM COMPLEX IN ASYMMETRIC DEHYDROGENATION OF SECONDARY ALCOHOLS
Authors: Ohkubo Katsutoshi , Terada Ikuhiro , Yoshinaga Kohji
Published: July 2006

(−)-2,3-O-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)buthane(diop) was found to be an efficient chiral ligand on using in Ru(II) catalyzed enantioselection of racemic alcohols with unsaturated additives. The dehydrogenation of PhEtCHOH by Ru2Cl4((−)-diop) with PhCH=CHCOPh at 165°C resulted in the formation of S-(−)-PhEtCHOH(11.0%e.e. at Conv.=56.8%).
THE COEXTRACTION OF WATER INTO NITROBENZENE WITH ALKALINE EARTH METAL 2,2′,4,4′,6,6′-HEXANITRODIPHENYLAMINATES IN THE PRESENCE OF CROWN ETHERS
Authors: Iwachido Tadashi , Minami Masayoshi , Sadakane Akira , Tôei Kyoji
Published: July 2006

The number of water molecules attached to alkaline earth metal cations (M2+: Ca2+,Sr2+, and Ba2+), some crown ethers (L), and the 1:1 metal-crown complexes (ML2+) extracted into nitrobenzene with hexanitrodiphenylamine was determined by the Karl-Fischer method. Ca2+, Sr2+, and Ba2+ have 13.0, 12.1, and 10.5 water molecules in nitrobenzene respectively, and 6 to 8 water molecules are released on complexation with the crown ethers.
NEW DIRECTED CROSS-ALDOL REACTION USING 9-TRIFLUOROMETHYLSULFONYL-9-BORABICYCLO[3.3.1]NONANE
Authors: Inoue Tan , Uchimaru Tadafumi , Mukaiyama Teruaki
Published: July 2006

A directed cross-aldol reaction between two different carbonyl compounds by using 9-trifluoromethylsulfonyl-9-borabicyclo[3.3.1]nonane and tertiary amine is described. The reaction of methyl ketones with the other carbonyl compounds takes place in regiospecific manner to afford the corresponding cross-aldols in good yields through intermediates, 9-(1-methyl-1-alkenyl)oxy-9-borabicyclo[3.3.1]nonanes.
A FACILE METHOD FOR THE PINACOL REARRANGEMENT OF PHENYLETHANEDIOL DERIVATIVES BY THE USE OF 2-CHLOROPYRIMIDINIUM SALT
Authors: Mukaiyama Teruaki , Echigo Yoshiaki , Shiono Manzo
Published: July 2006

The pinacol rearrangement proceeds under mild conditions by treating phenylethanediol derivatives with 2-chloropyrimidinium salt to give the corresponding aldehyde or ketones in good yields.
ELECTRONIC SPECTRA OF THE ANION RADICALS OF PYRIDINE AND QUINOLINE N-OXIDES
Authors: Ezumi Kiyoshi , Kubota Tanekazu , Shida Tadamasa
Published: July 2006

The electronic spectra of the anion radicals of pyridine and quinoline N-oxides were newly recorded. The radicals were generated by γ-irradiation of the frozen solutions at 77°K. The spectra were interpreted by means of the semiempirical SCFMO-CI calculations.
STUDIES ON THE PREPARATION AND PHYSICAL PROPERTIES OF MULTIVALENT METAL CONDENSED PHOSPHATES. XII. PREPARATION OF VARIOUS CERIUM PHOSPHATES
Authors: Tsuhako Mitsutomo , Ikeuchi Sayuri , Matsuo Tsuneo , Motooka Itaru , Kobayash Masamitsu
Published: July 2006

CePO4, CeP2O7, Ce(PO3)4, and CeP5O14 were chiefly obtained by the reaction of CeO2 with phosphoric acid; while CePO4·0.5H2O, CePO4, Ce(PO3)3, and CeP5O14 by the reaction of CeCl3 with phosphoric acid. The crystal of Ce(PO3)4 was isomorphous with that of U(PO3)4, thus Ce(PO3)4 must be a novel tetravalent cerium metaphosphate. The existence of two kinds of cerium metaphosphate, Ce(PO3)4 and Ce(PO3)3, was confirmed in this study.
OLEAN-18-ENE DERIVATIVES WITH A 13αH-CONFIGURATION
Authors: Honda Tadashi , Murae Tatsushi , Tsuyuki Takahiko , Takahashi Takeyoshi
Published: July 2006

13αH-Olean-18-ene derivatives (4 and 5) were prepared from olean-12-en-19-one derivatives (6 and 24, respectively) by a forced Wolff–Kishner reduction and subsequent acetylation and methylation. Methyl 2,3-di-O-acetylarjunate (15) was transformed, via 16 and 17, into a 13βH-olean-18-ene derivative (21), which proved to be not identical with 4. A 13αH-configuration was therefore shown for 4. A signal due to a C(19)–H of the 13αH-olefins (4 and 5) was observed at δ 5.30, while that of the 13βH-olefin (21) at δ 5.10.
7,10-DITHIASESQUIFULVALENE-1,6-QUINONE [2-(1,3-DITHIOL-2-YLIDENE)-4,6-CYCLOHEPTADIENE-1,3-DIONE]
Authors: Nakayama Jyuzo , Ishihara Miyoko , Hoshino Masamatsu
Published: July 2006

The title compound was synthesized by the condensation of 3-hydroxytropone with 2-methylthio-1,3-dithiolylium iodide and its spectroscopic properties were described.
REACTIONS OF ALLYLTIN COMPOUNDS III. ALLYLATION OF AROMATIC HALIDES WITH ALLYLTRIBUTYLTIN IN THE PRESENCE OF TETRAKIS(TRIPHENYLPHOSPHINE)PALLADIUM(O)
Authors: Kosugi Masanori , Sasazawa Kazuo , Shimizu Yutaka , Migita Toshihiko
Published: July 2006

Catalytic allylation of aryl halides with allyltributyltin in the presence of tetrakis(triphenylphosphine)palladium(O) was investigated. The reaction with aryl bromides proceeded efficiently to yield allylbenzenes.
SYNTHESES OF 2-DIAZO-4-CYCLOPENTENE-1,3-DIONE AND 2-DIAZO-4,6-CYCLOHEPTADIENE-1,3-DIONE. A MARKED DIFFERENCE IN THE DEGREE OF RESONANCE CONTRIBUTION OF THE CANONICAL FORMS
Authors: Oda Masaji , Kasai Masaji , Kitahara Yoshio
Published: July 2006

2-Diazo-4-cyclopentene-1,3-dione 1 and 2-diazo-4,6-cycloheptadiene-1,3-dione 2 are synthesized. The spectral data of these compounds indicate that there are considerable difference between them in the degree of resonance contribution of the canonical forms: the contribution of the enolate canonical form 1b to the resonance hybrid cf 1 is less important than the corresponding form of usual 2-diazo-1,3-diones, while the enolate form 2b to 2 is very important.
ALICYCLIC TERPENOIDS FROM CYCLOCITRYL PHENYL SULFIDES. IV. A SYNTHESIS OF METHYL ESTERS OF VITAMIN A1 AND A2 ACIDS AND THEIR GEOMETRIC ISOMERS
Authors: Uneyama Kenji , Torii Sigeru
Published: July 2006

Methyl esters of vitamin A1 and A2 acids were synthesized by the base-catalyzed desulfination of the C20 skeletons 2a and 2b derived from the coupling reaction between 3a or 3b and the bromo compound 5.
FACILE ACYLATION OF NUCLEOPHILES WITH OXIDIZING AGENT-THIOL ESTER PAIRS
Authors: Minato Hiroshi , Kodama Hiroshi , Miura Takashi , Kobayashi Michio
Published: July 2006

Thiol esters (MeCO-SPh, 2,4,6-Me3C6H2CO-SMe, p-MeC6H4SO2-SMe) were found to function as good acylating agents for nucleophiles(MeOH, t-BuOH, PhOH, PhNH2, Cl−, Br−) when mixed with oxidizing agents (m-ClC6H4CO3H, N-bromosuccinimide) in CH2Cl2 solution. Thiol esters and NBS appear to form a sulfurane as the reactive intermediate.
SYNTHESIS OF SIX-MEMBERED RING ANALOGUES OF PROSTAGLANDIN F1α
Authors: Eggelte T A , Koning H de , Huisman H O
Published: July 2006

Several isomeric prostaglandin F1α analogues in which the cyclopentane moiety is replaced by a cyclohexane ring, have been prepared starting from the Diels–Alder adduct of 1,4-diacetoxy-1,3-butadiene and dimethyl fumarate.
REACTIVITY OF HYDROGEN CHEMISORBED ON PLATINUM FOR HYDROGENATION OF PROPYLENE
Authors: Yoshioka Norihiko , Nakamura Masami , Tsuchiya Susumu
Published: July 2006

The three types of chemisorbed hydrogen (β, γ, and δ) on platinum detected by the temperature programmed desorption were found to exhibit the different reactivity for the hydrogenation of propylene; γ-hydrogen was more reactive than β-hydrogen, and δ-hydrogen was not involved in the hydrogenation.
SILYL PHOSPHITES V. THE REACTIONS OF TRIS(TRIMETHYLSILYL) PHOSPHITE WITH CARBONYL COMPOUNDS
Authors: Sekine Mitsuo , Yamamoto Isamu , Hashizume Akio , Hata Tsujiaki
Published: July 2006

When tris(trimethylsilyl) phosphite (1) was treated with aldehydes, ketones, or α,β-unsaturated aldehydes at room temperature, the 1,2-adducts were obtained in high yields (75–94%). On the other hand, when α,β-unsaturated ketones or ethyl crotonate was used, the 1,4-adducts were obtained in high yields (71–84%). The silylated products were smoothly hydrolyzed to the corresponding phosphonates in almost quantitative yields by addition of alcohol or water.
METALCARBIDES: A NEW NO2–NO CONVERTER MATERIAL FOR A CHEMILUMINESCENT NOX ANALYZER
Authors: Futsuhara Natsuko , Masuda Kazue , Tsuchimoto Koji , Yamaki Naoomi
Published: July 2006

Metalcarbides are investigated as a new NO2–NO converter material for measuring NO2 by using a chemiluminescent NOX analyzer. It is found that the metalcarbides make it possible to convert quantitatively NO2 to NO under very mild conditions without the oxidation of NH3 and N-compounds and without the decomposition of NO.
NONEQUIVALENCE BETWEEN THE GEMINAL DIHYDROXYPHOSPHINYL GROUPS IN SOME 2-SUBSTITUTED 1-AMINOETHYLIDENEDIPHOSPHONIC ACIDS
Authors: Fukuda Masahiro , Okamoto Yoshiki , Sakurai Hiroshi
Published: July 2006

Spectroscopic nonequivalence between the geminal PO(OH)2 groups of some aminodiphosphonic acids with a highly electronegative substituent at 2-position of 1-aminoethylidenediphosphonic acid was found by 1H NMR measurement in D2O. This may result from the formation of an inner salt between amino group and one of the PO(OH)2 groups.
AN INTRAMOLECULAR C-ACYLATION OF AN ENOL: PHOTOCHEMICAL REARRANGEMENT OF TRICYCLO[3.3.2.02,4]DECA-6,9-DIEN-8-ON-1-OL
Authors: Uyehara Tadao , Kayama Yasutaka , Taniguchi Mitsuo , Kabuto Chizuko , Kitahara Yoshio
Published: July 2006

Under direct irradiation in methanol, the compound in the title (6) gave tricyclic keto-ester 7. In the presence of acetic acid, 6 in methanol gave tetracyclo[5.3.01,7.02,10.03,5]deca-6,8-dione (8), which underwent futher photochemical change to monocyclic keto-ester 9.
PHOTOISOMERIZATION OF 6-METHYLENETRICYCLO[3.2.1.02,7]OCT-3-EN-8-OLS : A CONVENIENT SYNTHESIS OF 3-METHYLENETETRACYCLO [3.3.0.0.4,602,8]OCTAN-7-OLS AND RELATED KETONES
Authors: Nitta Makoto , Inoue Osamu , Tada Masaru
Published: July 2006

Ultraviolet irradiation of 6-methylenetricyclo[3.2.1.02,7]oct-3-en-8-ols (Ia) and (Ib) afforded 3-methylenetetracyclo[3.3.0.0.4,602,8]octan-7-ols (IIa) and (IIb) in fairly good yields. This photorearrangement is considered to be a di-π-methane rearrangement. Oxidation of the photoproducts gave the ketones retaining the carbon skeleton of IIa and IIb
HIGHLY ASYMMETRIC SELECTIVE POLYMERIZATION OF (RS)-α-METHYLBENZYL METHACRYLATE BY GRIGNARD REAGENT-(−)-SPARTEINE CATALYST SYSTEMS
Authors: Okamoto Yoshio , Ohta Koji , Yuki Heimei
Published: July 2006

Polymerization of (RS)-α-methylbenzyl methacrylate by Grignard reagent-(−)-sparteine catalyst systems was found to be a highly asymmetric selective process. The catalyst systems polymerized preferentially (S)-monomer over (R)-monomer. At 60–70% yield of the polymer, the optical purity of the unreacted monomer was more than 90%.
THE STUDIES OF THE ACTIVATED COMPOUND (I) A METAL INDUCED ACYLATION
Authors: Abe Kyo , Sato Takanori , Nakamura Nobuo , Sakan Takeo
Published: July 2006

The new activated compound, 2-acyloxy-3-methylpyrazine was treated with the Grignard reagent to give ketone in high yield. The comparison of reactivity of the activated compounds (8-acyloxyquinoline and 2-acyloxy-3-methylpyrazine) was described.
SYNTHETIC CONTROL BASED ON CHIRAL 2-HALOPYRIDINIUM SALTS II. THE KINETIC RESOLUTION OF RACEMIC AMINES
Authors: Mukaiyama Teruaki , Onaka Makoto , Shiono Manzo
Published: July 2006

Various racemic amines are kinetically resolved by use of (S)-(+)-2-chloro-l-(1-cyclohexylethyl)-3-ethyl-6-methylpyridinium tetrafluoroborate (I) and (S)-(+)-2-phenylbutanoic acid (II).
THE CONFIGURATION OF (+)-GLUTINOSONE
Authors: Murai Akio , Taketsuru Hirofumi , Yagihashi Fujio , Katsui Nobukatsu , Masamune Tadashi
Published: July 2006

The configuration of (+)-glutinosone was determined on the basis of the chemical transformation from (−)-rishitin and the NMR spectrum in the presence of the shift reagent.
THE CONFIGURATION OF 17-ETHYL-3β-HYDROXYETIOJERVA-5,12,17(20)-TRIEN-11-ONE AND RELATED COMPOUNDS
Authors: Murai Akio , Sasamori Hiroshi , Masamune Tadashi
Published: July 2006

The title compound, one of the most important starting materials for the synthesis of C-nor-d-homosteroid and normal steroid hormones, was determined to possess (E)-configuration at the 17,20-double bond on the basis of the chemical and spectral evidence.
EMISSION SPECTRUM OF HYDROGEN SULFIDE IN A HELIUM AFTERGLOW
Authors: Tsuji Masaharu , Tsuji Kumiyo , Fukutome Hisao , Nishimura Yukio
Published: July 2006

Emission spectrum of H2S from the interaction of He (23S) with H2S was observed in a fast flow system. Radiation from the excited fragments, SH+(A3Π-X3Σ−) and H (Balmer series), was identified in the 300–500 nm region. It was presumed that the excited fragments arose from superexcited states of H2S.
BIOSYNTHESIS OF PROTOANEMONIN IN RANUNCULUS GLABER. THE STEREOCHEMISTRY OF THE HYDROGEN ELIMINATION IN THE FORMATION OF THE DOUBLE BOND OF PROTOANEMONIN
Authors: Suga Takayuki , Hirata Toshifumi , Okamoto Emiko , Kataoka Makio
Published: July 2006

In order to determine the stereochemistry of the hydrogen elimination in the formation of the Δ3-double bond of protoanemonin (I) by Ranunculus glaber Makino, [(3r)-3-3H1;3,4-14C]- and [3-3H2;3,4-14C]-α-ketoglutaric acids were administered to the plants. The 3H/14C ratios in I biosynthesized from these doubly labeled acids demonstrated that the formation of the Δ3-double bond occurs with the stereospecific loss of the pro-3s-hydrogen atom of α-ketoglutaric acid.
A DIFFUSION OF METAL INTO POLYMERIC LAYER BY A NOVEL ELECTRO-INDUCED METALLOCHROMIC REACTION
Authors: Ohno Shin
Published: July 2006

A copper evaporated organic film consisting of a poly(vinyl-chloride) matrix and a precursor of a chelating agent was tinged with magenta (λmax=520 nm) under successive treatments of electron bombardment and heating. On the bombarded part, structure of film was changed from laminated double layers to single organic one. The coloration was due to formation of a cupric metallochrome (colored chelate) and was closely related to the change of chemical property of evaporated copper by the above treatments. Thus the copper disappearance from the surface was estimated to have occurred by diffusion into the organic layer.
NOVEL EFFECTS OF CROWN-ETHER COMPLEXATION ON THE HETEROGENEOUS GAS-PHASE REACTIONS OF ALKYL HALIDES OVER SILICA GEL-SUPPORTED METAL CHLORIDES
Authors: Mizuno Koichi , Watanabe Hitoshi , Misono Makoto , Take Jun-ichiro , Yoneda Yukio
Published: July 2006

Gas-phase reactions of alkyl halides over the complexes of KCl and CaCl2 with dibenzo-18-crown-6 supported on silica gel exhibited high substitution to elimination ratio and relative reactivities of primary > secondary and iodide > bromide, in contrast to those over uncomplexed metal chlorides. These results together with stereochemistry and poisoning effect indicate that the complexation with crown ether enhances the nucleophilicity or basicity of metal chlorides.
AN IMMUNO SENSOR FOR SPECIFIC PROTEIN
Authors: Aizawa Masuo , Suzuki Shuichi , Nagamura Yoichi , Shinohara Rikio , Ishiguro Isao
Published: July 2006

An immuno sensor for determining specific protein has been developed. The measuring system is characterized by the potentiometric determination of potential difference across an antigenbinding membrane. A lipid antigen containing cardiolipin, phosphatidyl choline, and cholesterol was immobilized to an acetylcellulose membrane. The membrane-bound antigen retained the immunochemical reactivity to Wassermann antibody. The assymmetric membrane potential developed was dependent on the concentration of the antibody.
FREE RADICAL ADDITION OF 3-CHLORO-4,4-DIMETHYL-2-OXAZOLIDINONE TO ALLYLSTANNANE AND ALLYLSILANE
Authors: Kosugi Masanori , Yano Kazuyoshi , Chiba Mitsuo , Migita Toshihiko
Published: July 2006

Free radical reaction of 3-chloro-4,4-dimethyl-2-oxazolidinone (NCDMO) to allylstannane and allylsilane were found to give 3-allyl-4,4-dimethyl-2-oxazolidinone. The formation of the product was interpreted in terms of addition of the acylamino radical. NCDMO does not react with ordinary olefin, perhaps owing to inhibiting behavior of enamine which may be derived from the adduct of NCDMO to olefin.
STABLE CYCLOPENTADIENONE DERIVATIVES. PERCHLORO-2H,5H-CYCLOPENTA[b]PYRAN-5-ONE AND -2,5-DIONE
Authors: Kusuda Kousuke , Roedig Alfred , Bonse Gerhard
Published: July 2006

Perchloro-2H,5H-cyclopenta[b]pyran-5-one (12a) was obtained by thermal electrocyclic ring closure of diketone (11). Compound 12a was hydrolized to another stable cyclopentadienone derivative, perchloro-2H,5H-cyclopenta[b]pyrane-2,5-dione (8), which was prepared directly from (4) by treatment with sulfuric acid.
INCORPORATION OF CARBON DIOXIDE IN ALKYNE OLIGOMERIZATION CATALYZED BY NICKEL(0) COMPLEXES. FORMATION OF SUBSTITUTED 2-PYRONES
Authors: Inoue Yoshio , Itoh Yoshio , Hashimoto Harukichi
Published: July 2006

1-Hexyne and carbon dioxide were allowed to react with the catalyst system, Ni(COD)2[COD=1,5-cyclooctadiene]-Ph2P(CH2)nPPh2 (n=1,2,3,4), to give 4,6-dibutyl-2-pyrone together with 1-hexyne oligomers.
CMR CHEMICAL SHIFTS AND TOTAL CHARGE DENSITIES OF [2.2]CYCLOPHANES. THE EFFECT OF TRANSANNULAR Π- Π INTERACTION
Authors: Takemura Tetsuo , Tokita Kazushi , Kondo Shoichi , Mori Nobuo
Published: July 2006

The chemical shifts for the transannularly π-π interacted and the non-interacted aryl carbons in three [2.2]cyclophanes bear linear relationships to the total charge densities. The interacted carbons are shifted downfield by ca. 7 ppm compared with the noninteracted ones, when the total charge densities are the same.
SYNTHESIS OF ISO-π-ELECTRONIC HETEROANALOGUES OF HEPTAFULVALENE
Authors: Kato Kazuo , Kitahara Yoshio , Morita Noboru , Asao Toyonobu
Published: July 2006

Several iso-π-electronic oxa- and thia-heteroanalogues of heptafulvalene were synthesized by the reaction of the corresponding heterocyclic ketones with 8-oxoheptafulvene. These fulvalenes were found to be polyolefinic by comparison of their physical and chemical properties with those of heptafulvalene.
THE [1,2] VS. [2,3] SIGMATROPIC REARRANGEMENTS IN α-ALLYLOXYCARBENE
Authors: Iwamura Hiizu , Iwai Masahiro , Kihara Hiroshi
Published: July 2006

The [2,3] sigmatropic rearrangement has been predicted by MO theoretical calculations (MINDO/3) to be preferred to the [1,2] shift in α-allyloxycarbene giving 3-buten-1-al. The activation energy for the former process is governed by the non-neighboring two center terms, indicating that the reaction can be replaced by the [1,2] shift under increased steric demand as observed in an γ,γ-dimethylallyloxycarbene.
DIRECT SYNTHESIS OF VITAMIN K1 AND K2
Authors: Tachibana Yoji
Published: July 2006

Vitamin K1(20) and K2(10) were obtained in good yields by the reactions of 2-methyl-1,4-naphthocuinone with phytyl and geranyl halide in the presence of metal dust. In this method, no reduction oxidation process is involved and the substitution at position 2 to form the isomeric by-product can be blocked effectively.
THE CRYSTAL STRUCTURE OF 2:1 TETRAPROPYLAMMONIUM GUANIDINIUM BROMIDE COMPLEX, [N (C3H7)4]+2[C (NH2)3]+Br− 3
Authors: Taga Tooru , Ohashi Makoto , Miyajima Koichiro , Yoshida Hiromitsu , Osaki Kenji
Published: July 2006

The crystal structure of the title compound is a distorted CaF2 type of ionic crystal. The guanidinium ion is bound to the three bromide ions by the NH···Br hydrogen bonds and forms a rigid divalent anionic group. The two tetrapropylammonium groups have the different conformations represented by the symmetry, \bar42m and \bar4.
SELECTIVITY IN THE PRODUCT-DISTRIBUTION UPON THE ADDITION OF DICHLOROCARBENE TO OLEFINS BY USE OF TERTIARY AMINES AS CATALYSTS
Authors: Kimura Yoshikazu , Isagawa Kakuzo , Otsuji Yoshio
Published: July 2006

The dichlorocarbene species generated from chloroform and aqueous sodium hydroxide in the presence of tertiary amines exhibits a high selectivity in the product-distribution upon its addition to olefins containing multiple double bonds; the monoadducts was produced in preference to the bisadducts. The selectivity increases with decrease in the reactivity of the dichlorocarbene species.
RING CLEAVAGE OF EPOXIDES WITH THIOANISOLE–CHLORINE COMPLEX: A SIMPLE SYNTHESIS OF α-CHLOROCARBONYL COMPOUNDS
Authors: Nakai Hisao , Kurono Masayasu
Published: July 2006

The reaction of epoxides (1) with thioanisole-chlorine complex (2) produced α-chlorosulfoxonium intermediates (3a and/or 3b), which were quenched with aqNaHCO3 to afford α-chloroalcohols (4a and/or 4b). The intermediate (3a and/or 3b) gave α-chlorocarbonyl compounds (5a and/or 5b) by treatment with triethylamine.
PHOTOCHEMICAL REACTION OF 2-ACETYL-1,4-BENZOQUINONE IN THE PRESENCE OF ROSE BENGAL
Authors: Maruyama Kazuhiro , Narita Noritsugu , Miyagi Yo
Published: July 2006

Irradiation of 2-acetyl-1,4-benzoquinone 1 in acetonitrile in the presence of rose bengal afforded the dimer, 2-acetyl-3-phenoxy-1,4-benzoquinone derivative 3. This is quite different from another dimer 2, which is obtained in the photochemical reaction of 1 in the absence of rose bengal.
ONE-STEP FORMATION OF [9]PARACYCLOPHA-3,5-DIENES BY A CYCLOADDITION REACTION
Authors: Kataoka Fumio , Nishida Shinya
Published: July 2006

The reaction of certain 1-substituted 1-cyclopropyl-1,3-butadiene (1: (Remark: Graphics omitted.)-CR=CHCH=CH2, a: R=(CH3)3C–, b: R=(CH3)2CH-, c: R = cyclo-C3H5–, d: R=C6H5) with TCNQ yielded a [9]paracyclopha-3,5-diene (2). Formation of the same adduct 2d from both E-1d and Z-1d suggests a stepwise mechanism probably involving a dipolar intermediate.
A NOVEL METHOD FOR THE PREPARATION OF PRIMARY AMINES BY THE USE OF N-BENZYLHYDROXYLAMINE AND 2-FLUOROPYRIDINIUM SALT
Authors: Mukaiyama Teruaki , Tsuji Takashi , Watanabe Yutaka
Published: July 2006

Primary amines were prepared from alkyl halides or olefinic compounds by the use of N-benzylhydroxylamine and 2-fluoro-1-methylpyridinium p-toluenesulfonate.
ELECTRON SPIN RESONANCE SPECTRA OF N-ALKYL-N-(ALKYLTHIO)AMINYLS
Authors: Miura Yozo , Asada Hidetsugu , Kinoshita Masayoshi
Published: July 2006

A variety of N-alkyl-N-(alkylthio)aminyls are generated from the appropriate N-alkylalkanesulfenamides by hydrogen-abstraction with t-butoxyl and are investigated by ESR spectroscopy.
SYNTHESES AND PROPERTIES OF TRIMETHYLBISDEHYDRO[17]ANNULENONE AND ITS BENZANNELATED DERIVATIVES
Authors: Qjima Juro , Kanazawa Keiko , Kusaki Kiyomi , Wada Kazuyo
Published: July 2006

Syntheses of 2,7,12-trimethyl- 5, 12,17-dimethylbenzo[f]-6, 2,12-dimethylbenzo[f]- 7, and 2-methyldibenzo[f,1]-8,10-bisdehydro[17]annulenone 8 are described. The 1H-NMR spectra of these annulenones suggest that the skeleton of the bisdehydro[17]annulenone of this type is more planar and less strained than that of the corresponding [13]annulenone.
PARTICIPATION OF CYCLODEXTRIN INCLUSION CATALYSIS IN PHOTOLYSIS OF CHLORPROMAZINE TO GIVE PROMAZINE IN AQUEOUS SOLUTION
Authors: Uekama Kaneto , Irie Tetsumi , Hirayama Fumitoshi
Published: July 2006

Photo-irradiation of chlorpromazine in the presence of cyclodextrins (CyDs) gave promazine in high yield in an aqueous solution. This dechlorination reaction and the proceeding photooxidation to give promazine sulfoxide were found to be largely dependent upon the cavity size of CyDs (β-CyD > γ-CyD > α-CyD), indicating a selective catalysis through formation of an inclusion complex.
FORMATION OF THE STABLE INTERMEDIATE COMPLEXES IN THE HALOGENATION OF POLYACETYLENE
Authors: Shirakawa Hideki , Sasaki Toshimasa , Ikeda Sakuji
Published: July 2006

Stable charge–transfer π complexes [–(CH=CH)n– (CH=CH– … X+)X3−–]m X = Cl, Br, and I, are formed between both trans- and cis-polyacetylene [–(CH=CH)n–] with chlorine, bromine, and iodine, which have strong absorptions in near i.r. to i.r. region, and show a large increase in electrical conductivity.
SYNTHETIC STUDIES ON DERIVATIVE OF 6-epi-PURPUROSAMINE B, A COMPONENT OF FORTIMICINS
Authors: Suami Tetsuo , Honda Yutaka , Kato Tsuguhiro
Published: July 2006

6-epi-Purpurosamine B is a component of pseudo-disaccharide antibiotic fortimicins. The derivative: methyl 2,6-di-N-acetyl-6-epi-α-purpurosaminide B was synthesized from methyl 2-acetamido-2-deoxy-6-O-trityl-α-d-glucopyranoside.
THE BF3 CATALYZED DECOMPOSITION OF DIAZOCARBONYL COMPOUNDS IN NITRILES: SYNTHESIS OF OXAZOLES
Authors: Ibata Toshikazu , Sato Ryohei
Published: July 2006

The BF3 catalyzed decomposition of diazocarbonyl compounds in nitriles afforded the corresponding oxazoles in high yield. This method is applicable to diazocarbonyl compounds such as m- and p-substituted diazoacetophenones, ethyl diazoacetate, azibenzil, dibenzoyldiazomethane, dimethyl diazomalonate, and 7-diazo-8-acenaphthenone.
ADDITION OF CARBON TETRACHLORIDE TO CONJUGATED 1,3-DIENES CATALYZED BY DICHLOROTRIS(TRIPHENYLPHOSPHINE)RUTHENIUM(II)
Authors: Matsumoto Hideyuki , Nakano Taichi , Nikaido Toshimi , Nagai Yoichiro
Published: July 2006

Addition of carbon tetrachloride to conjugated 1,3-dienes such as 1,3-butadiene, 1,3-pentadiene, isoprene, 1,3-cyclohexadiene and 1,3-cyclooctadiene proceeded smoothly under mild conditions in the presence of dichlorotris(triphenylphosphine)ruthenium(II) to give the corresponding 1,4-addition products as 1:1 adducts in excellent yields.
CROWN COMPLEXANE. 1,10-DIAZA-4,7,13,16-TETRAOXACYCLOOCTADECANE-N,N′-DIPROPIONIC ACID
Authors: Takagi Makoto , Tazaki Masato , Ueno Keihei
Published: July 2006

The title compound (1, H2L), a new type of complexane chelating agent, was synthesized and the complexation properties were examined by potentiometric method. The successive acid dissociation constants (in pKa unit) were 2.61 (H4L2+), 3.63 (H3L+), 8.20 (H2L) and 8.92 (HL−) at 25.0 °C and μ = 0.10M (KNO3). The conditional stability constants (in log KML unit) for MIIL were <2 (Mg2+), 4.0 (Ca2+), 4.4 (Sr2+) and 3.8 (Ba2+). Interaction with Co2+, Ni2+ and Zn2+ was comparable to the alkaline earth metals. Cu 2+ interacted strongly but in a complicated manner.
BEHAVIORS OF LATTICE OXYGEN OF TRISILVER DODECAMOLYBDOPHOSPHATE CATALYST IN THE REACTION OF H2 + 18O2
Authors: Tsuneki Hideaki , Niiyama Hiroo , Echigoya Etsuro
Published: July 2006

Behaviors of lattice oxygen of Ag3PMo12O40 in catalytic reaction of H2 + 18O2 were studied. 18O was predominantly introduced in place of bridge-bonded oxygen of polyanion, (PMo12O403−). Presumably, the reaction proceeds through redox cycles of bridge-bonded oxygen.
NOVEL REARRANGEMENT OF DIHYDROMAYURONE WITH BORON TRIFLUORIDE IN ACETIC ACID-ACETIC ANHYDRIDE
Authors: Sekizaki Haruo , Ito Masaaki , Inoue Shoji
Published: July 2006

Acid-catalyzed isomerization of dihydromayurone (4) with boron trifluoride etherate in acetic acid-acetic anhydride afforded 4-acetoxy-1β,11,11-trimethylbicyclo[5.4.0]undeca-3,7-diene (5), 4-acetoxy-1β,7β,11-trimethylbicyclo[5.4.0]undeca-3,10-diene (6), 7-acetoxy-2,2,3-trimethyltricyclo[5.2.2.01,6]undec-3-ene (16), and 4-acetyl-7-acetoxy-2,2,3-trimethyltricyclo[5.2.2.01,6]undec-3-ene (17) as the case may be, according to reaction temperature.
PHOTOCYCLOADDITION OF 5,7-DIMETHOXYCOUMARIN TO TETRAMETHYLETHYLENE
Authors: Shim Sang Chul , Chi Dae Yoon
Published: July 2006

The photocycloaddition reaction of DMC to TME is studied as a model for skin-sensitizing DMC-thymine C4-cycloaddition reaction. The DMC-TME 1:1 C4-cycloadduct is obtained with a quantum yield of 0.16. The fluorescence of DMC is quenched by TME giving a linear Stern–Volmer plot and kq of 4 × 109  l mole−1 sec−1 and singlet exciplex formation mechanism is proposed for the cycloaddition of DMC to TME.
THE CHARACTERIZATION OF A PLATINUM-TIN OXIDE CATALYST BY X-RAY PHOTOELECTRON SPECTROSCOPY
Authors: Katayama Akiko
Published: July 2006

A Pt–SnO2 catalyst in various compositions of Pt and SnO2 was prepared and its properties were studied by XPS. Some of platinum of Pt–SnO2 were observed to be stabilized by SnO2 in Pt+2 and Pt+4 forms, and Pt0 form still remained in Pt–SnO2. However, platinum, prepared in the same manner with the method of preparation of Pt–SnO2, stayed at the state identical to platinum metal. Tin existed in an SnO2 form, indifferent to the presence of platinum.
PREPARATION AND THERMAL DECOMPOSITION OF UNSYMMETRICAL DIALKYL PLATINUM(II) COMPLEXES. ELUCIDATION OF A FACTOR CONTROLLING THE EASE OF β-ELIMINATION
Authors: Komiya Sanshiro , Yamamoto Akio , Yamamoto Takakazu
Published: July 2006

Unsymmetrical dialkylbis(triphenylphosphine)platinum(II), Pt(Ra)(Rb)(PPh3)2, has been prepared by the reaction of Pt(Ra)X(PPh3)2with alkylating reagents such as (Rb)MgX and (Rb)Li. The distribution of the gaseous products on thermolysis of these compounds reveals that the relative ease of β-eliminaiton concerning Ra and Rb is controlled by the numbers of β-hydrogens in these alkyl groups.
A CONFORMATIONAL STUDY OF THREE ISOMERIC [3.3]CYCLOPHANEQUINONES
Authors: Shinmyozu Teruo , Inazu Takahiko , Yoshino Tamotsu
Published: July 2006

Three isomeric [3.3]cyclophanequinones 2-4 were synthesized. The conformations of these compounds were discussed on the basis of the NMR spectra. The electronic spectra suggested that the paracyclophane system adopted the most suitable conformation for charge transfer interaction.
SYNTHESIS OF AMINO DERIVATIVES OF CYCLOHEPTAAMYLOSE HAVING STRONG ANTIMICROBIAL ACTIVITIES
Authors: Tsujihara Kenji , Kurita Hironori
Published: July 2006

In a study of the relationship between a number of amino groups in cycloheptaamylose and their antimicrobial activity, the polyamino derivatives of cycloheptaamylose, VIa and VIb possessing ten and eleven amino groups respectively were synthesized. VIa and VIb showed strong antimicrobial activities against such gram negative bacteria as Escherichia, Shigella and Pseudomonas species.
POSSIBLE IMPORTANCE OF AN ABNORMAL ORBITAL INTERACTION IN EXCITED-STATE REACTIONS BETWEEN ELECTRON DONORS AND ACCEPTORS
Authors: Inagaki Satoshi , Hirabayashi Yoshio
Published: July 2006

Photochemical reactions between powerful electron donors and acceptors are likely controlled by the (HOMO)D–(LUMO)A interaction involved in the D*A–D+*A− or DA*–D+A−* interaction, the frontier orbital interaction being the same as one in usual thermal reactions.
CARBOXYLATION OF ACTIVE METHYLENE COMPOUNDS USING 1,3-DIPHENYLUREA, POTASSIUM CARBONATE AND CARBON DIOXIDE
Authors: Chiba Koji , Akama Toshio , Sakakibara Kiyoo , Horie Kiyoshi
Published: July 2006

Indene, and fluorene were effectively carboxylated by employing the reagent system, 1,3-diphenylurea, potassium carbonate and carbon dioxide, in organic solvent at room temperature and atmospheric pressure, to produce indenemonocarboxylic acid and fluorene-9-carboxylic acid, respectively. Diphenylurea was almost quantitatively recovered unchanged. Cyclohexanone was slightly carboxylated by the similar procedure. But acetonitrile, acetophenone, dibenzylketone, diphenylmethane, and xanthene were scarcely carboxylated.
REVISED STRUCTURE OF THE PRODUCT FROM ACETOPHENONE AND BENZONITRILE IN THE PRESENCE OF ALUMINUM CHLORIDE
Authors: Kashima Choji , Imada Satoshi , Nishio Takehiko
Published: July 2006

On the basis of 13C-nmr and chemical studies, the title product was concluded not to be N-(1-phenylethylidene)-β-aminochalcone (1-a), as first described by Barluenga and co-workers, but 4-methyl-2,4,6-triphenyl-4H-1,3-oxazine (1-b).
THE CRYSTAL STRUCTURE OF 7R(S),14S(R)-5,5,7,12,12,14-HEXAMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECANENICKEL(II) CHLORIDE DIHYDRATE
Authors: Ito Tasuku , Toriumi Koshiro
Published: July 2006

The crystal structure of the title coumpound has been determined by the X-ray diffraction method. The nickel(II) ion is surrounded square-planarly by four nitrogen atoms of the macrocyclic ligand. The strong hydrogen-bond networks prevent the coordination of chloride ions and water molecules, yielding a diamagnetic nickel(II) complex.
ASYMMETRIC SYNTHESIS OF 3-SUBSTITUTED 3,4-DIHYDRO-β-CARBOLINONES
Authors: Wakabayashi Toshio , Watanabe Kenzo
Published: July 2006

A novel method of phase-transfer catalysed alkylation at C-3 position of 3,4-dihydro-β-carbolinones and an asymmetric synthesis of (S)-3-carbomethoxymethyl-9-methyl-3,4-dihydro-β-carbolinone (7) are reported.
ONE-STEP SYNTHESIS OF 2-ARYLETHENYL METHYL SULFIDES FROM ARYL ALDEHYDES AND DIMETHYL SULFOXIDE
Authors: Kojima Takakazu , Fujisawa Tamotsu
Published: July 2006

A facile method for preparing trans-α,β-unsaturated sulfides has been established by the reaction of aryl aldehydes with dimethyl sulfoxide in the presence of matallic sodium. The reaction proceeds through the selective reduction of an intermediate, 2-arylethenyl methyl sulfoxide, which also gives enol ethers by the reaction with sodium alkoxides.
THE REACTION OF ORGANOHALIDES WITH NICKEL CARBONYL IN THE PRESENCE OF OLEFIN OXIDES
Authors: Rhee Ilsong , Ryang Membo , Hasegawa Hideo , Murai Shinji , Sonoda Noboru
Published: July 2006

Reaction of aroyl- or alkenoylnickel carbonyl halide complexes, derived from the reaction of organohalides with nickel carbonyl, with olefin oxides afforded halohydrin esters.
MOLECULAR CONFORMATIONS OF TRI- THROUGH PENTAMETHYLENE GLYCOL DIMETHYL ETHERS AS MODEL COMPOUNDS OF POLYETHERS
Authors: Matsuura Hiroatsu , Murata Hiromu
Published: July 2006

Raman and infrared spectra were measured for CH3O(CH2)nOCH3(n=3–5) as model compounds of polyethers [–O(CH2)n–]p . The spectral observations, combined with the normal coordinate treatment, indicated that the conformational stabilities of the model compounds are closely related to the chain conformations of the polymers.
A NEW TISHCHENKO-TYPE ESTER FORMATION CATALYZED BY RUTHENIUM COMPLEXES
Authors: Horino Hiroshi , Ito Takashi , Yamamoto Akio
Published: July 2006

A self-condensation of aldehydes to yield esters is catalyzed by ruthenium complexes under mild conditions without appreciable side reactions. The reaction is applicable to both aliphatic and aromatic aldehydes, and the ruthenium complexes proved to be particularly active catalysts among other transition metal complexes examined.
MOLECULAR FORCE FIELD AND ROTATIONAL ISOMERISM OF ALKYL SELENIDES
Authors: Matsuura Hiroatsu , Ohno Keiichi , Murata Hiromu
Published: July 2006

The molecular force field of alkyl selenides was determined from about 100 observed vibrational frequencies. The force field was applied to larger molecules of butyl methyl, ethyl propyl, and dipropyl selenides to study the rotational isomerism. The conformational stability of the selenides was compared with that of sulfides and ethers.
PREPARATION OF NUCLEOSIDE 3′,5′-CYCLIC PHOSPHATES VIA 8-QUINOLYL NUCLEOSIDE 5′-PHOSPHATES AS A USEFUL INTERMEDIATE
Authors: Takaku Hiroshi , Kato Masaathu , Hata Tsujiaki
Published: July 2006

The intramolecular cyclization of 8-quinolyl nucleoside 5′-phosphates (1)with cupric chloride in pyridine led to the synthesis of nucleoside 3′,5′-phosphates (2) in good yields by fission of the P–O bond of 8-quinolyl esters of nucleoside 5′-phosphate.
BINUCLEAR METAL COMPLEXES. XXII. ANTIFERROMAGNETIC SPIN-EXCHANGE INTERACTION IN COPPER(II)-MANGANESE(II) HETERO-METAL COMPLEXES
Authors: Torihara Naoyuki , Okawa Hisashi , Kida Sigeo
Published: July 2006

Copper(II)-manganese(II) hetero-metal binuclear complexes with 3-formylsalicylic acid-diamine Schiff bases were synthesized and characterized. The cryomagnetic measurements demonstrated that an antiferromagnetic spin-exchange interaction operates between the metal ions, the exchange integral, J, being estimated at −22∼−44 cm−1.
SYNTHESIS OF ARYL IODIDES FROM ARYL HALIDES AND POTASSIUM IODIDE BY MEANS OF NICKEL CATALYST
Authors: Takagi Kentaro , Hayama Naomi , Okamoto Tadashi
Published: July 2006

Facile synthesis of aryl iodides from aryl halides was reported. NiBr2–Zn catalyzed the halogen exchange reaction of aryl bromides with potassium iodide under mild conditions. At elevated temperatures, NiBr2–PBu3 was an effective catalyst.
THERMAL AND PHOTOCHEMICAL CURTIUS TYPE REARRANGEMENT OF N-ACYL-S,S-DIPHENYLSULFIMIDES
Authors: Furukawa Naomichi , Nishio Takehiko , Fukumura Mitsuo , Oae Shigeru
Published: July 2006

Thermal decomposition of N-acyl-S,S-diphenylsulfimides(Ia–g) gave easily isocyanates(IIa–g) in high yields, together with diphenyl sulfide, while photolysis of Id afforded the insertion product(III), indicating the formation of singlet nitrene.
CATALYTIC PRE-WAVE OF NICKEL(II) AND FORMATION OF NICKEL SULFIDE IN THIOSULFATE SOLUTIONS AT MERCURY ELECTRODES
Authors: Itabashi Eiki
Published: July 2006

It was found that nickel(II) in thiosulfate solutions at mercury electrodes gave a catalytic pre-wave, and NiS was produced in the electroreduction process of nickel(II). The electrode reaction which is proceeded by the formation of Ni(S2O3) from Ni(H2O)62+ is retarded by the adsorption of NiS at higher concentrations of S2O32−. It has been proposed that the formation of NiS is due to the chemical reduction of S2O32− bound to Ni(O)S2O32− by the electroreduced metallic nickel.
STERIC CROWDING IN A HIGHLY POLARIZED [5.6.7]QUINARENE
Authors: Takahashi Kazuko , Sakae Toshisada , Takase Kahei
Published: July 2006

Sterically hindered 9,12-dicyano-7,13-dimethyl-10,11-diphenyl [5.6.7]quinarene (2) was spectroscopically investigated in order to clarify the effect of steric crowding on the structure of highly polarized [5.6.7]quinarenes. It has proved that the steric crowding caused a twisting of the molecule around the intercyclic bonds resulting in a further increase of charge separation and a decrease of electronic interaction among the three rings.
SYNTHESIS OF PYRIMIDINE PHOTOPRODUCTS: 6-[2′-OXO-1′,2′-DIHYDROPYRIMIDIN-4′-YL]-PYRIMIDIN-2,4-DIONE (URA[6-4]PYO) AND ITS 5-METHYL-DERIVATIVE (THY[6-4]PYO)
Authors: Taguchi Hiroyasu
Published: July 2006

Products formed in traces by the u.v. irradiation of DNA, Thy[6-4]pyo (5-methyl-6-[2′-oxo-1′,2′-dihydropyrimidin-4′-yl]-pyrimidin-2,4-dione) and Ura[6-4]pyo (6-[2′-oxo-1′,2′-dihydropyrimidin-4′-yl]-pyrimidin-2,4-dione) were synthesized in excellent yield from readily available 6-acetyl-pyrimidine derivatives.
ALKYLATION OF 2,4-DIMETHYL-3-FUROIC ACID AND SYNTHESIS OF 4,6-DIOXO-14-NORFURANOEUDESMANS
Authors: Tada Masahiro , Takahashi Takeyoshi
Published: July 2006

Treatment of 2,4-dimethyl-3-furoic acid in THF with LDA gave a dianion (A). Alkylation of A with methyl iodide, cyclohexanone, 2-methyl-2-cyclohexenone or 3-methoxy-2-cyclohexenone yielded the corresponding alkylated derivatives (2, 3, 4 or 5) respectively. The methyl ester (6) was treated with LiMe2Cu to give 4,6-dioxo-14-norfuranoeudesmane (7), a key intermediate for the synthesis of some eudesmanolides and elemanolides.
FLUORINATION OF ACTIVATED HALOGENS WITH KF IN POLYETHYLENE GLYCOL-ACETONITRILE SYSTEM
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

Polyethylene glycol (mol. wei. 300–600) was found to be effective as a phase-transfer catalyst on the fluorination of activated halogen compounds with potassium fluoride in acetonitrile. Carboxylic and sulfonic acid chlorides were readily converted into their fluorides in high yields.
SYNTHESIS AND REACTIONS OF VINYLPHOSPHONATES BEARING ELECTRONEGATIVE SUBSTITUENTS
Authors: Minami Toru , Suganuma Hiroyuki , Agawa Toshio
Published: July 2006

Ethyl α-(diethylphosphono)acrylate (1a) and α-(diethylphosphono)acrylonitrile (1b) prepared by thermolysis of ethyl 2-diethylphosphono-2-phenylsulfinylpropionate (2a) and 2-diethylphosphono-2-phenylsulfinylpropionitrile (2b) react with various nucleophiles to generate corresponding phosphonate anions, which subsequently react with carbonyl compounds to give annelated or acyclic olefinic compounds in good yields.
SYNTHESES OF 5-ARYL- AND 5,15-DIARYL-2,3,7,8,12,13,17,18-OCTAETHYLPORPHINES
Authors: Ogoshi Hisanobu , Sugimoto Hiroshi , Nishiguchi Takahiro , Watanabe Tsutomu , Matsuda Yoshiro , Yoshida Zen-ichi
Published: July 2006

5-Aryl- and 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphines were prepared with high selectivity by the condensation of bis-(3,4-diethylpyrryl)methane with aromatic aldehydes by varying acidic media.
DIRECT CHEMILUMINESCENCE FROM AIR OXIDATION OF 9,10-DIISOBUTYRYLANTHRACENE AND RELATED COMPOUNDS IN ALKALINE APROTIC SOLVENTS
Authors: Kamiya Isao , Sugimoto Takashi
Published: July 2006

It was previously reported that excited triplet products were predominantly generated from air oxidation of various simple ketones in alkaline aprotic solvents. In the present study, we have found that excited singlet product, 9-isobutyrylanthracene-10-carboxylic acid which emits fluorescence, was generated from air oxidation of 9,10-diisobutyrylanthracene under the same experimental conditions. This finding lends strong support to the hypothesis that dioxetanes may be the critical intermediates to give excited singlet products (good emitters).
A STUDY OF REVERSIBLE BINDING OF MOLECULAR OXYGEN TO COBALT(II) OCTAETHYLPORPHYRIN BY 57Co MÖSSBAUER EMISSION SPECTROSCOPY
Authors: Sakai Hiroshi , Maeda Yutaka , Ogoshi Hisanobu , Sugimoto Hiroshi , Yoshida Zen-ichi
Published: July 2006

57Co Mössbauer emission spectra of Co(II) octaethylporphyrin, Co(II) OEP, and its pyridine and oxygen adduct, Co(II) OEP·Py·O2, have been measured in the dimethylformamide frozen solution at 20°K. The former consists of two chemical species of Fe(II) OEP. The latter exhibits Fe(II) OEP·Py·O2 and Fe(II) OEP·Py2. The oxygenated complex is changed to the bis-pyridine adduct by evacuation at about −30°C.
REACTION OF TRICHLORO- and DICHLORO-ACETIC ACID WITH 1-ALKENES CATALYZED BY DICHLOROTRIS (TRIPHENYLPHOSPHINE) RUTHENIUM (II). A CONVENIENT ROUTE TO 2-CHLORINATED 4-ALKYL-γ-BUTYROLACTONES
Authors: Matsumoto Hideyuki , Nakano Taichi , Ohkawa Kazuhiro , Nagai Yoichiro
Published: July 2006

In the presence of dichlorotris(triphenylphosphine)ruthenium(II), trichloro- and dichloro-acetic acid were found to react with 1-alkenes under mild conditions to afford 4-alkyl-2,2-dichloro- and 4-alkyl-2-chloro-γ-butyrolactones, respectively, in good yields.
OXIDATION OF ALCOHOLS WITH 2-FLUORO-1-METHYLPYRIDINIUM TOSYLATE AND DIMETHYL SULFOXIDE OR HEXAMETHYLENETETRAMINE
Authors: Hojo Ko , Mukaiyama Teruaki
Published: July 2006

Primary and secondary alcohols activated by 2-fluoro-1,3-dimethylpyridinium tosylate reacted with dimethyl sulfoxide to give corresponding aldehydes and ketones in good yields. Oxidation of aromatic alcohols was also effected by the reaction of the activated alcohols with hexamethylenetetramine, followed by acid hydrolysis.