bluuebunny/crossref_metadata_2025 huggingface dataset:
CONCENTRATION DEPOLARIZATION OF PHOSPHORESCENCE AND ENERGY TRANSFER BETWEEN LIKE MOLECULES
Authors: Gondo Yasuhiko , Hirai Masanori , Iwao Tsuyoshi , Kakibaya Takashi , Kuroi Tatsuaki , Nagatomo Hisaaki , Kanda Yoshiya
Published: July 2006

Two new findings are reported on the energy transfer between like molecules in rigid glass at 77 K: The depolarization of the phosphorescence is not mainly caused by the triplet–triplet energy transfer, but essentially by the singlet–singlet transfer. And the concentration where the depolarization starts to take place depends on the individual phosphor compounds.
ISOLATION AND THE STRUCTURE OF EUOLALIN, A NEW SESQUITERPENE POLYESTER, FROM EUONYMUS ALATUS FORMA STRIATUS (THUNB.) MAKINO
Authors: Sugiura Kimio , Shizuri Yoshikazu , Yamada Kiyoyuki , Hirata Yoshimasa
Published: July 2006

A new sesquiterpene polyester of eudesmane type was isolated from Euonymus alatus forma striatus (Thunb.) Makino, and the structure was established to be (1), based on chemical and spectral evidences.
A NOVEL OXIDATIVE ADDITION INVOLVING C–H BOND CLEAVAGE ADJACENT TO A C=C DOUBLE BOND
Authors: Komiya Sanshiro , Yamamoto Akio
Published: July 2006

Dihydridotetrakis (triphenylphosphine)ruthenium(II) reacted with alkyl methacrylate to give hydrido(2-alkoxycarbonylpropenyl)tris(triphenylphosphine) ruthenium(II) , RuH (CH=C)(CH3(COOR))(PPh3)3 and an equimolar amount of alkyl isobutyrate per mole of the dihydride complex. Structure of the resultant complex was proposed from the results of IR and NMR spectroscopy and chemical reactions.
ANOMALOUS RESPONSE OF LIQUID MEMBRANE ELECTRODE BASED ON NEUTRAL CARRIER
Authors: Seto Hideaki , Jyo Akinori , Ishibashi Nobuhiko
Published: July 2006

The non-Nernstian anomalous response of a neutral carrier-based liquid membrane electrode was studied, and the equation on the membrane potential of the electrode was derived on the basis of the Teorell–Meyer–Sievers theory. The relationship between the anomalous behavior of the electrode and the composition of the electrode membrane was successfully explained by the equation.
THE HIGH SELECTIVITY OF MgO AND CaO FOR THE FORMATION OF 2-CARENE FROM 3-CARENE
Authors: Tanabe Kozo , Shimazu Katsuaki , Hattori Hideshi
Published: July 2006

The selectivity of various oxide catalysts for the isomerization of 3-carene were studied at 50–200°C. 2-Carene was predominantly formed over MgO, CaO, SrO, Y2O3, La2O3, and ZrO2, while p-cymene and various menthadienes over Ce2O3, Tio2,Al2O3, and SiO2–Al2O3. BaO, ZnO, and ThO2 produced only p-cymene, but their activities were very low.
DEHYDRATION AND DSHYDROGENATION OF sec-BUTANOL OVER ZINC PHOSPHATE CATALYST
Authors: Tada Akio , Itoh Hidenobu , Kawasaki Yoshitaka , Nara Juniclii
Published: July 2006

The dehydration and dehydrogenation of sec-butanol were carried out on zinc phosphate catalyst. The catalyst was found to show a very high selectivity for the dehydrogenation, when calcined at 650°C, though it showed a high selectivity for the dehydration when calcined at 300°C. The active sites for the dehydrogenation were confirmed to be basic sites by a poisoning experiment.
ELECTRON SPIN RESONANCE SPECTRA OF RADICAL ANIONS DERIVED FROM CYCLOHEPTA-3,6-DIENE-1,2,5-TRIONE AND CYCLOHEPTA-4,6-DIENE-1,2,3-TRIONE
Authors: Sakurai Hideki , Okada Akane , Shoji Yoshikazu , Itô Shô
Published: July 2006

The tropolone analoques of p- and o-benzosemiquinone (p- and o-troposemiquinone) were generated from cyclohepta-3,6-diene-1,2,5-trione and cyclohepta-4,6-diene-1,2,3-trione, respectively, and characterized by e.s.r. spectroscopy.
THE FORMATION OF HEXAGONAL BaCrO2.90 WITH A 5-LAYER STACKING SEQUENCE
Authors: Torii Yasuyoshi
Published: July 2006

The compound BaCrO2.90 was synthesized with a 5-layer hexagonal perovskite-like structure by firing in argon. The lattice parameters were a=5.732 Å and c= 11.920 Å. The atomic coordinates of each atom in BaCrO2.90 were determined by means of trial and error method. This compound was found to be of the Ba5Ta4O15 type.
KINETICS ON THE SULFONATION REACTION OF 1-DODECENE WITH SODIUM HYDROGENSULFITE
Authors: Sakumoto Akihisa , Miyata Teijiro , Washino Masamitsu
Published: July 2006

The kinetics on the radiation-induced addition of hydrogensulfite to 1-dodecene was investigated in the presence of a surfactant, 1-dodecanesulfonate, in an aqueous solution of t-butyl alcohol. The termination was found to be the reaction of 1-dodecanesulfonate radical with sulfite radical ion. This result was deduced to be due to the micellar effect.
A PROMISING MODIFICATION OF THE CARBODIIMIDE METHOD USING AN INSOLUBLE CARBODIIMIDE
Authors: Ito Hisashi , Takamatsu Norihiro , Ichikizaki Iwao
Published: July 2006

A modified polystyrene-divinylbenzene copolymer, in which ethylcarbodiimidomethyl groups were linked so as to be available as a condensing agent for peptide synthesis, were prepared. This polymer proved of great use in synthesizing some protected peptides without accompanying any troublesome by-product which would otherwise be formed.
STUDIES ON THE MICHAEL-TYPE REACTION OF S-VINYL SULFILIMINE
Authors: Yamamoto Tamotsu , Okawara Makoto
Published: July 2006

S-Phenyl-S-vinyl-N-tosyl-sulfilimine (3) was synthesized and the Michael type reactions of (3) with various nucleophiles such as thiols, dithiocarbamate, alcohols, amines and malononitrile were investigated. The adducts (4) obtained were pyrolyzed to give the vinyl compounds (7) together with sulfenamide (8) in good yield.
PHOTOCHEMICAL REACTION OF CYCLOHEPTATRIENE WITH SOME AROMATIC QUINONES
Authors: Mori Akira , Takeshita Hitoshi
Published: July 2006

The photochemical addition reaction of cycloheptatriene with p-benzoquinone and 1,4-naphthoquinone yielded the spiro-ethers having 7-oxa-bicyclo[4,2,1] nonadiene moiety by the characteristic (6+2)π addition process. The latter quinone further produced the carbocyclic (2+2)π - and (6+2)π cycloadducts. Either (4+2)π adducts or dioxetanes were undetectable in both cases. The photoadducts were stable under their formation conditions, showing no tendency to cause the isomerization.
THE REACTION OF CYCLOALKANONES WITH COPPER(II) HALIDES. IV. THE OXIDATIVE RING CONTRACTION OF CYCLOFEPTANONES WITH COPPER(II) CHLORIDE IN ACETIC ACID
Authors: Satoh J Yasuo , Nishizawa Kyoko , Hirose Masakatsu
Published: July 2006

In the reaction of cyoloheptanones with copper(II) chloride, it was found that ring contraction accompanying decarbonylation occurred, followed by chlorination, yielding polychlorinated cyclohexane-1,2-diones.
HYDROGENATION OF OLEFINS CATALYZED BY ALKALINE EARTH METAL OXIDES
Authors: Hattori Hideshi , Tanaka Yasutaka , Tanabe Kozo
Published: July 2006

Hydrogenation of olefins was investigated over MgO, CaO, SrO, and BaO at 250°C. The oxides became active on evacuating above 600°C and showed maximum activities when evacuated around 1000°C. The maximum activity increased in the order of MgO < CaO < BaO < SrO. The order of the hydrogenation rate was 1-butene < propylene << ethylene over MgO and CaO.
ESR STUDY OF PHOSPHORANYL RADICALS OF PFnH4−n TYPE TRAPPED IN MATRICES
Authors: Sogabe Kunihisa , Hasegawa Akinori , Komatsu Tamikuni , Miura Masaji
Published: July 2006

A series of phosphoranyl radicals of PFnH4-n type trapped in xenon and SF6 matrices was investigated by ESR method. The isotropic hyperfine coupling of the phosphorus atom was found to decrease remarkably on the successive replacements of the ligand fluorine by hydrogen. This was interpreted in terms of the electronegativity difference between the fluorine and hydrogen atoms.
SYNTHESIS AND RESOLUTION OF OPTICALLY ACTIVE CARBONFUNCTIONAL ORGANOSILICON COMPOUNDS
Authors: Terunuma Daiyo , Okada Toshihiro , Araki Tsunao , Nohira Hiroyuki
Published: July 2006

Triorganosilylmethylanimes, Me(PhCH2)RSiCH2NH2 [R=C6H5(Ia), p-MeC6H4(Ib), m-MeC6H4(Ic), and o-MeC6H4(Id)] were resolved by fractional crystallization of the (+)-tartaric acid salts of the racemic triorganosilylmethylamines from methanol. The following optically active amines were obtained from the less soluble diastereoisomers; (+)-Ia([α]D21 +9.9 (c=5, in Et2O)), (−)-Ib ([α]D21−16.6 (c=5, in Et2O)), (+)-Ic([α]D22 +11.1 (c=5, in Et2O)), and (+)-Id ([α]D21 +7.0 (c=5, in Et2O)).
STEREOSELECTIVE FORMATION OF SOME THIETANE 1,1-DIOXIDES VIA SULFENES BY THE REACTION OF DIAZO COMPOUNDS WITH SULFUR DIOXIDE
Authors: Tanabe Toyoshige , Shingaki Tadao , Nagai Toshikazu
Published: July 2006

In the reaction of diazo compounds with sulfur dioxide, trapping experiment by enamines indicates the existence of sulfene as a reaction intermediate. The stereochemistry of the sulfene-enamine cycloadducts and the solvent effect upon the stereoselectivity gave a suggestive information on the mechanism of the cycloaddition reaction.
A SENSITIVE METHOD FOR THE DETERMINATION OF ANTIMONY BY NON-DISPERSIVE ATOMIC FLUORESCENCE SPECTROMETRY
Authors: Tsujii Kanji , Kuga Kazuo , Sugaya Isao
Published: July 2006

A sensitive method for the determination of antimony by non-dispersive atomic fluorescence spectrometry is described. Antimony is converted to stibine utilizing sodium borohydride reduction, and atomized in a hydrogen-argon-entrained air flame. The detection limit of antimony is 3 ng, and the analytical working curve is linear in the range of three decades of concentration from the detection limit.
THE PREPARATION OF N-ALKYL AND N-ARYLGLYCINES FROM GLYOXYLIC ACID USING CARBONYLHYDRIDOFERRATE AS A REDUCING AGENT
Authors: Watanabe Yoshihisa , Shim Sang Chul , Mitsudo Take-aki , Yamashita Masakazu , Takegami Yoshinobu
Published: July 2006

N-Substituted glycines were prepared from glyoxylic acid and a variety of primary amines using carbonylhydridoferrate (0).
STEREOSELECTIVE SYNTHESIS OF TRISUBSTITUTED OLEFINS VIA π-ALLYLIC NICKEL BROMIDE COMPLEXES WITH FUNCTIONAL GROUP
Authors: Sato Kikumasa , Inoue Seiichi , Morii Shigeki
Published: July 2006

The reaction of several organic halides with the complexes, prepared from 1-bromo-2-methyl-4-phenoxy-2-butene or 4-benzyloxy-1-bromo-2-methyl-2-butene and nickel carbonyl in benzene, afforded trisubstituted (E)-olefins, such as 2-methyl-4-phenoxy-1-phenyl-2-butene, geranyl benzyl ether, and farnesyl benzyl ether, stereoselectively.
CLATHRATE INCLUSION OF FERROCENE AND CYMANTRENE
Authors: Bozak Richard E , Barone Anthony D
Published: July 2006

Cymantrene is found to incorporate into a ferrocene clathrate of thiourea. Inclusion of cymantrene in the absence of ferrocene does not occur. A novel proof of clathration is demonstrated utilizing photochemical decarbonylation.
CARBON-13 NMR SPECTRA OF SODIUM SALTS OF DIETHYL ALKYL-SUBSTITUTED MALONATES
Authors: Kiyooka Syun-ichi , Suzuki Kojiro
Published: July 2006

13C chemical shifts of diethyl alkyl-substituted malonates and their sodium salts in dimethylsulfoxide are reported. The resonances of carbonyl carbons and α-carbons having an active hydrogen in the sodium salts were respectively found at 0.5∼1 ppm 20 ppm lower fields than those of the original malonates did.
TRANSFER HYDROGENATION OF ALDEHYDES CATALYZED BY DIHYDRIDOTETRAKIS(TRIPHENYLPHOSPHINE)RUTHENIUM(II)
Authors: Imai Hideaki , Nishiguchi Takeshi , Fukuzumi Kazuo
Published: July 2006

In the hydrogen transfer reaction catalyzed by dihydridotetrakis(triphenylphosphine)ruthenium(II), aldehydes and ketones are reduced to corresponding alcohols by ethers, hydroaromatic compounds, a tert-amine and alcohols under mild conditions.
LAYERED COMPOUNDS. XXVIII. [2.2](1,3)PYRENOPHANE AND ANOTHER TRIPLE-LAYERED METACYCLO-PYRENOPHANE
Authors: Umemoto Teruo , Kawashima Toshihide , Sakata Yoshiteru , Misumi Soichi
Published: July 2006

[2.2] (1,3)Pyrenophane (5) and a triple-layered metacyclopyrenophane (10) were synthesized successfully via transannular reaction of 4,6-bisbromomethyl[2.2]metacyclophane with bromine as a key step and finally by dehydrogenation with DDQ.
THERMALLY STABLE CYCLOHEXADIENYL RADICALS PRODUCED IN THE BENZENE CLATHRATES WITH METAL COMPLEX HOST LATTICES
Authors: Iwamoto Toschitake , Kiyoki Mamoru , Matsuura Niro
Published: July 2006

The cyclohexadienyl radicals in the γ-irradiated benzene clathrates Cd(diam)M(CN)4·2C6H6 (diam = (NH3)2, NH2(CH2)2NH2, or NH2(CH2)3NH2; M = Cd or Hg) are stable up to 423 K.
A CONVENIENT METHOD FOR METHYLENATION OF CARBONYL COMPOUNDS. THE REDUCTIVE β-ELIMINATION OF 2-(PHENYLTHIO)ETHANOLS INTO TERMINAL OLEFINS USING TiCl4–LiAlH4
Authors: Watanabe Yutaka , Shiono Manzo , Mukaiyama Teruaki
Published: July 2006

2-(Phenylthio)ethanols readily accessible from carbonyl compounds and phenylthiomethyllithium were converted into terminal olefins in high yields by way of the reductive β-elimination on treatment with TiCl4 and LiAlH4 in the presence of tertiary amine such as 1,8-bis(dimethylamino)naphthalene or tri-n-butylamine.
NOVEL [σ+π] CYCLOADDITION OF SILACYCLOBUTANES WITH ACETYLENES CATALYZED BY PALLADIUM COMPLEXES
Authors: Sakurai Hideki , Imai Takafumi
Published: July 2006

In the presence of a palladium complex, 1,1-dimethyl-1-silacyclobutane reacts smoothly with dimethyl acetylenedicarboxylate to give 1,1-dimethyl-2,3-bis(methoxycarbonyl)-1-silacyclohex-2-ene in quantitative yield. Other silacyclobutanes react similarly with various acetylenes to give silacyclohexene derivatives.
CONVERSION OF γ -RAYS INTO UV-LIGHT
Authors: Sato Shin , Okazaki Kiyoshi
Published: July 2006

The apparatus for the measurement of the efficiency of the conversion of γ-rays into UV-light has been devised. The conversion system consists of helium gas with a drop of mercury. The G-value of UV-light-photons at 253.7 nm produced in this system by γ-irradiation was estimated both experimentally and theoretically. The mercury photosensitized decomposition of nitrous oxide at 0°C was used as the actinometer. The efficiency of the conversion of 60Co γ-rays into UV-light at 253.7 nm was found to be 80 %.
VINYLAMINE XIX. ZUR HYBRIDISIERUNG DES STICKSTOFFS IN DIPHENYLAMIN UND iso-BUTENYLANILIN
Authors: Ahlbrecht Hubertus , Papke Günter
Published: July 2006

Die Darstellung von 15N-markiertem Diphenylamin (2) und iso-Butenylanilin (3) wird beschrieben. Vergleich der 1J15NH -Kopplung zeigt, daß der Einfluß einer Vinylgruppe und eines Phenylkerns auf einen Anilinstickstoff sehr ähnlich ist und in beiden Fällen zu einer starken Einebnung der Stickstoffpyramide führt.
REDOX SUBSTOICHIOMETRY IN ISOTOPE DILUTION ANALYSIS. I. DETERMINATION OF ANTIMONY IN THE PRODUCT OF RADIOANTIMONY 124Sb
Authors: Kambara Tomihisa , Suzuki Junsuke , Yoshioka Hiroe , Nakamura Toshio
Published: July 2006

Redox substoichiometry in the isotope dilution analysis of antimony was studied. As the substoichiometric reaction the oxidation of trivalent antimony to pentavalent with potassium permanganate was used, followed by the BPHA extraction of trivalent antimony. The redox substoichiometry was applied to the determination of antimony content in 124Sb obtained from JAERI. The content determined was 0.481±0.02 μg, which agreed with the certified value.
PREPARATION AND CIRCULAR DICHROISM OF OPTICAL ACTIVE COBALT(III) COMPLEX CONTAINING 3,3′-DIMETHYL-2,2′-BIPYRIDINE
Authors: Suzuki Toshishige
Published: July 2006

Cobalt(III) complex of a bulky ligand 3,3′-dimethyl-2,2′-bipyridine (dmbpy), [Coen2dmbpy] Cl(ClO4)2·H2O was synthesized and resolved. Stereospecific coordination was found. The effects of non-coplanarity of coordinated dmbpy were observed in the absorption (AB) and circular dichroism (CD) spectra of the resolved complex.
A CONVENIENT METHOD FOR THE REDUCTION OF RUTHENIUM AND RHODIUM HALIDE COMPLEXES
Authors: Kono Hiromichi , Wakao Naofumi , Nagai Yoichiro
Published: July 2006

[RuX2(PPh3)3] (X = Cl or Br) and [RhCl(PPh3)3] were reduced with silicon hydrides in the presence of triethylamine in benzene to give [RuHX(PPh3)3·C6H6] and [RhH(PPh3)4] in high yields.
THE PHOTOLYSIS OF VINYL IODIDE AND THE MASS SPECTRUM OF VINYL RADICAL
Authors: Yamashita Shigeru
Published: July 2006

The photolysis of vinyl iodide has been studied using UV light beam of high intensity and a collision-free photochemical reactor incorporated in the ion-source of mass spectrometer. The primary process C2H3I + hν → C2H3 + I was found predominant and the process C2H3I + hν → C2H2 + HI minor, and the mass spectrum of vinyl radical was obtained.
APPARENT MOLAL COMPRESSIBILITY OF SODIUM CHLORIDE IN WATER
Authors: Sakurai Masao , Nakajima Toshio , Komatsu Tsuyoshi , Nakagawa Tsurutaro
Published: July 2006

Apparent molal adiabatic compressibilities of sodium chloride were measured in water at 5, 25, and 45°C. The Debye–Hückel limiting slopes were estimated experimentally. A convenient equation for the conversion of adiabatic to isothermal compressibilities was derived. The results indicate that the limiting slope for isothermal compressibility is larger by about 10% than that for adiabatic compressibility.
THERMOLYSES OF 1,8-CIS AND TRANS-TRICYCLO[6.4.0.03,6]DODECA-4,10-DIENE-2,7-DIONE. A SEQUENTIAL RING OPENING AND INTRAMOLECULAR DIELS-ALDER REACTION LEADING TO A CAGE MOLECULE AND MARKED DEPENDENCE OF THE REACTION ON CONFIGURATION AND SUBSTITUENT
Authors: Oda Masaji , Miyazaki Hideo , Kitahara Yoshio
Published: July 2006

Thermolysis of the ois title compound 4 yields a cage molecule 6 by a sequential ring opening of the cyclobutene and intramolecular Diels–Alder reaction. On the other hand, the trans isomer 8 gives 2,3-benzo-2,5-cyclooctadiene-1,4-dione 10 by a ring opening followed by hydrogen shifts and an oxidation. While the former reaction shows a marked substituent effect, the latter does not. An unusual conformation of 10 is suggested.
THE ASSOCIATION OF i-BUTYRATE AND TRIMETHYLACETATE IONS IN WATER
Authors: Ebina Satoshi , Uedaira Hisashi
Published: July 2006

The electric conductivities of sodium i-butyrate and trimethylacetate were measured in water at 25°C. It was shown that the molar conductivities of both solutions reach a maximum at a concentration of about 1 mol m−3 (McBain effect), and that the hydrophobic interaction of i-butyrate and trimethylacetate ions is so strong that these ions form a dimer.
METATHESIS OF ALKENES HAVING FUNCTIONAL GROUPS
Authors: Nakamura Ryuichi , Matsumoto Shuichi , Echigoya Etsuro
Published: July 2006

WC16/(CH3)3Al2Cl3 and Mo(OC2H5)2Cl3/(CH3)3Al2Cl3 were found to be the effective catalysts for the metathesis of alkenes having various functional groups such as –COOR, –OCOR, –OR, –CN, –COR, and –CONR2. These reactions should be quite important in a synthesis of telechelic compounds or bioactive substances such as sex attractant pheromones.
A NEW METHOD FOR CYCLOPENTENONE ANNELATION VIA THE REARRANGEMENT OF BICYCLIC CYCLOPROPYL KETONES. SYNTHESES OF BICYCLO[4.3.0] NON-6-EN-8-ONE AND BICYCLO[5.3.0]DEC-7-EN-9-ONE
Authors: Wada Eiji , Nakai Takeshi , Okawara Makoto
Published: July 2006

A new sequence for cyclopentenone annelation is described which involves the rearrangement of protonated bicyclic acetylcyclopropanes as a key step. Applications of the annelation procedure to cyclohexene and cycloheptene afforded the bicyclo[4.3.0]nonane and bicyclo[5.3.0]decane frameworks, respectively. Further elaboration of the bicyclodecane derivative provides a simple and efficient synthetic route to 2-substituted azulenes.
NEW SYNTHESIS OF γ-IONONE
Authors: Mukaiyama Teruaki , Saigo Kazuhiko , Takazawa Osamu
Published: July 2006

γ-Ionone was successfully synthesized without accompanying any isomeric substances such as α- and β-ionones by dehydration of a key intermediate, 4-(6-methylene-2,2-dimethylcyclohexyl)-4-hydroxy-2-butanone, prepared from γ-cyclocitral and acetone by the use of di-n-butylboryl trifluoromethanesulfonate and triethylamine as coupling reagents.
THE REACTION OF ENOL ETHERS WITH SIMMONS–SMITH REAGENT. THE FORMATION OF ALLYLIC ETHERS
Authors: Ryu Ilhyong , Murai Shinji , Sonoda Noboru
Published: July 2006

The Simmons–Smith reaction of methyl and ethyl cyclohexenyl ethers has resulted in the formation of allylic ethers, in addition to expected cyclopropyl ethers. In one case the allylic ether was obtained as the major product of this reaction.
NOVEL CYCLOPROPENYL PHOSPHONIC ACID ESTERS AND NEW SYNTHESIS OF PYRROLE DERIVATIVE. REACTIONS OF TRIALKYLTHIOCYCLOPROPENIUM ION AND DIALKYLTHIOCYCLOPROPENETHIONE WITH TRIVALENT PHOSPHORUS COMPOUNDS
Authors: Yoneda Shigeo , Hirai Hideo , Yoshida Zen-ichi
Published: July 2006

The reactions of trialkylthiocyclopropenium ion (1) and dialkylthiocyclopropenethione (6) with various trivalent phosphorus compounds were investigated. The reactions of 1 and 6 with trialkyl phosphite were found to give the cyclopropenyl phosphonic acid esters. The similar treatment of 1 with hexamethylphosphorous triamide led to the formation of the pyrrole derivative.
SELECTIVE CLEAVAGE OF C–O BONDS IN ESTERS THROUGH OXIDATIVE ADDITION TO NICKEL(0) COMPLEXES
Authors: Ishizu Junichi , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

Zero-valent nickel complexes, especially bis(1,5-cyclooctadiene)nickel Ni(cod)2 in the presence of various tertiary phosphines, promote cleavage of C–O bonds in phenyl carboxylates and alkenyl acetates to give nickel complexes such as nickel carbonyls and nickel phenoxide and other gaseous and liquid products. The position of cleavage of the ester and consequently the products of the reaction depend on the ester, nickel complex employed and the ligand added to the reaction mixture.
INTERMEDIATE STATE IN THE PHOTOIONIZATION OF CHLORPROMAZINE IN ETHANOL
Authors: Iwaoka Teiki , Kondo Michio
Published: July 2006

The excited state responsible for the photoionization of chlorpromazine was investigated in ethanol. Triplet–triplet energy transfer experiment excluded the participation of the lowest (π-π*)triplet state in the ionization process. Fluorescence was not influenced by addition of several quenchers which retarded the photoionization. The higher triplet state of different electronic configuration from the lowest (π-π*)triplet state is suggested to be the reactive state for the ionization.
INAPPLICABILITY OF THE “EXO RULE” TO THE 1,3-DIPOLAR CYCLOADDITIONS TO NORBORNADIENES
Authors: Taniguchi Hisaji , Ikeda Toshikazu , Yoshida Yoshihiro , Imoto Eiji
Published: July 2006

1,3-Dipolar cycloadditions of phenylglyoxylonitrile oxide, benzonitrile-N-phenylimine, or N-phenyl-C-p-nitrophenylnitrone to norbornadiene and 2,3-disubstituted norbornadienes gave the endo-adducts together with the exo-adducts. These observations show that 1,3-dipolar cycloadditions to norbornadienes do not follow the “exo rule” of Alder and Stein.
ENANTIOSELECTIVE ADDITION OF DICHLOROCARBENE TO OLEFINS BY USE OF CHIRAL TERTIARY AMINES
Authors: Kimura Yoshikazu , Ogaki Yasuhisa , Isagawa Kakuzo , Otsuji Yoshio
Published: July 2006

Dichlorocarbene generated from chloroform and aqueous sodium hydroxide using chiral tertiary amines as a catalyst adds enantioselectively to olefins to give chiral dichlorocyclopropane derivatives. Optical rotations of the products strongly depend on the structure of catalysts employed.
THE REACTION OF ORGANOSILICON HYDRIDES WITH ETHYL AZIDOFORMATE. FORMATION OF ORGANOSILYL ISOCYANATES AND ALKOXIDES FROM ETHYL N-ORGANOSILYLCARBAMATES
Authors: Watanabe Hamao , Arai Nori , Ohsawa Noboru , Kobayashi Mitsunobu , Kitahara Tohru , Nagai Yoichiro
Published: July 2006

Reaction of organosilicon hydrides with ethyl azidoformate was investigated. The products, ethyl N-silylcarbamates which were formed in 30–80% yields, are shown to be thermally unstable and to give organosilyl isocyanates and alkoxides by heating.
ASYMMETRIC HYDROGENATION BY A RHODIUM CATALYST COMPLEXED WITH A PHOSPHINITE DERIVED FROM CELLULOSE
Authors: Kawabata Yasuziro , Tanaka Masato , Ogata Ikuei
Published: July 2006

High optical yields up to ca. 77% were obtained in the hydrogenation of 2-phenyl-1-butene by use of a rhodium catalyst complexed with an insoluble phosphinite derived from 6-O-triphenylmethylcellulose. Recycling of the catalyst was also investigated.
SELECTIVE FORMATION OF KETONE, DIKETONE AND ALDEHYDE BY THE CO INSERTION INTO NICKEL–ALKYL BONDS OF DIALKYLNICKEL COMPLEXES. A NOVEL NICKEL-CATALYZED SYNTHESES OF KETONES AND TERTIARY ALCOHOLS FROM GRIGNARD REAGENTS, ARYL HALIDES, AND CARBON MONOXIDE
Authors: Yamamoto Takakazu , Kohara Teiji , Yamamoto Akio
Published: July 2006

Reaction of dialkylnickel complexes, NiR2L2 (R = CH3, C2H5, C3H7; L = 1/2 (2,2′-bipyridine), 1/2[1,2-bis(diphenylphosphino)ethane], triethylphosphine) with carbon monoxide give ketones, diketones and aldehydes depending on the reactivity of the dialkylnickel complexes and the reaction temperature. Nickel complexes NiY2L2 (Y = halogen or alkyl; L = ligand) catalyze formation of ketones and tertiary alcohols from Grignard reagents, aryl halides, and carbon monoxide.
AN ELECTRON SPIN RESONANCE STUDY OF THE OXIDO-REDUCTIVE INTERACTION OF Cu(II)-GLYCYLGLYCINE AND CYSTEINE IN A NEUTRAL AQUEOUS SOLUTION
Authors: Hanaki Akira
Published: July 2006

The oxi do-reductive interaction of Cu(II)-glycylglycine and cysteine was examined with electron spin resonance ( ESR) spectroscopy using a continuous-flow technique. Firstly, Cu(II)-glycylglycine associates with cysteine to form a ternary complex, which is decomposed subsequently (relaxation time = 150 msec) to ESR silent species. When an excess of cysteine is added, the ternary complex is transformed to unidentified Cu(II) species, probably Cu(II)-cysteine complexes, undergoing rapid decomposition to Cu(I) species.
2-DIALKYLAMINOPYRIDINIUM SALTS AS NEW TYPE OF CATALYSTS IN TWO-PHASE ALKYLATION REACTION
Authors: Tanaka Toshio , Mukaiyama Teruaki
Published: July 2006

2-Dialkylaminopyridinium salts, derived from 2-halopyridinium salts and primary or secondary amines, were effectively employed as catalysts in the two-phase alkylation reaction of active methylene compounds with alkyl halides to afford the corresponding alkylated products in good yields.
BETAINE AS AN EFFECTIVE ACID CAPTOR: A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXYLIC ESTERS
Authors: Mukaiyama Teruaki , Toda Haruhiko , Kobayashi Susumu
Published: July 2006

The equimolar reactions of carboxylic acids and alcohols with 1-methyl-2-fluoro or -2-chloropyridinium salt in the presence of a betaine, (3,4-dihydro-2H-pyrido[1,2-a]pyrimidin-2-one(I)), afforded the corresponding carboxylic esters in good yields.
CATALYTIC DECOMPOSITION OF A DIBENZYLSELENONIUM YLIDE WITH THIOAMIDES
Authors: Tamagaki Seizo , Hatanaka Isao
Published: July 2006

Dibenzylselenonium cyano(methoxycarbonyl)methylide was readily decomposed by the action of catalytic amounts of thioamides affording the corresponding selenide and tetra-substituted ethylene, while with increasing amounts of the thioamides the ylide was found to react in a different fashion.
STRUCTURE OF KADSURIC ACID. A NEW SECO-TRITERPENOID FROM KADSURA JAPONICA DUNAL
Authors: Yamada Yasuji , Hsu Chau-Shin , Iguchi Kazuo , Suzuki Sukeji , Hsu Hong-Yen , Chen Yuh-Pan
Published: July 2006

A new A-seco-lanostane type triterpenoid, kadsuric acid, was isolated from Kadsura japonica Dunal and its structure was elucidated as 1 on the basis of the spectroscopic data and the chemical transformations.
THE CHOLESTERIC MESOPHASE IN POLY-l-GLUTAMIC ACID-POLY(ETHYLENE OXIDE)-DIMETHYLFORMAMIDE SYSTEM
Authors: Tsutsui Tetsuo , Tanaka Takehide
Published: July 2006

The cholesteric mesophase of poly-l-glutamic acid which incorporated poly(ethylene oxide) chains was found. The polarizing micrographs of the cholesteric phases, the phase diagram of poly-l-glutamic acid-poly(ethylene oxide)-dimethylformamide ternary system, and the effect of molecular weight of poly(ethylene oxide) on the stability of the cholesteric phases, suggested the importance of the intermolecular interactions between constituent polymers for the stabilization of the cholesteric mesophases.
Hg(II)-, Hg(I)-, AND Ag(I)-INDUCED 1,8-DIALKOXYLATION, -DIAMINATION, AND -DIACYLOXYLATION OF 2,7-DI-TERT-BUTYL-4,5,9,10-TETRAPHENYLTRICYCLO [6.2.0.03,6]DECA-1,3(6),4,7,9-PENTAENE
Authors: Takehira Yoshikazu , Tanaka Koichi , Toda Fumio
Published: July 2006

The treatment of the title compound (1) with Hg(II), Hg(I), or Ag(I) salt in the presence of ROH, RNH2, and RCO2H afforded 5,10-dialkoxy- (2a–c), 5,10-diamino- (2d–e), and 5,10-diacyloxy-2,7-di-tert-butyl-4,5,9,10-tetraphenyltricyclo [6.2.0.03,6]deca-1,3,6,8-tetraene (2f–g), respectively.
AES-FDS SIMULTANEOUS MEASUREMENT FOR DECOMPOSITION OF FORMIC ACID OVER CLEAN SURFACE OF COPPER–NICKEL ALLOY
Authors: Watanabe Kuniaki , Mohri Mamoru , Hashiba Masao , Yamashina Toshiro
Published: July 2006

A combined system of Auger spectroscopy (AES) and flash desorption spectroscopy (FDS) was utilized to reveal adsorption and decomposition processes of formic acid over clean surface of Cu–Ni alloy. It was found that the surface treatments of ion-bombardment and annealing brought about a great difference in decomposition process which could be attributed to change of the surface composition.
METHANOL REFORMING REACTION OVER COPPER-CONTAINING MIXED OXIDES
Authors: Kobayashi Haruo , Takezawa Nobutsune , Minochi Chiaki
Published: July 2006

Methanol was decomposed into hydrogen and carbon dioxide in the presence of water at atmospheric pressure over copper-containing mixed oxides, indicating that the reforming reaction CH3OH + H2O = CO2+ 3H2 proceeded to an appreciable extent. The mixed oxides were active and selective for the reforming reaction whereas the single oxides which constituted the mixed oxides were much less active for the reaction.
SPIN-LABELED METACHROMATIC DYES. II. INTERACTIONS OF SPIN-LABELED PROFLAVINE WITH POLYPHOSPHATE AND SOME DYE-POLYPHOSPHATE COMPLEXES
Authors: Yamaoka Kiwamu , Noji Sumihare
Published: July 2006

Metachromasy was studied by means of ESR and light absorption using a spin-labeled Proflavine (slPF) which interacts with polyphosphate. The exchange interaction between bound slPF’s was observed. Qualitative correlations were found between the magnetic and optical data. slPF could be utilized as a probe for dye-polyphosphate complexes.
STUDIES ON NITRO SUGARS VII. SYNTHESIS OF METHYL 2,3,5-TRIACETAMIDO-2,3,5-TRIDEOXY-β-d-PENTOFURANOSIDES VIA NITROOLEFIN
Authors: Takamoto Tetsuyoshi , Tanaka Hozumi , Kawahara Takayuki , Sudoh Rokuro
Published: July 2006

Synthesis of methyl 5-azido-3-nitro-2,3,5-trideoxy-β-d-glycero-pent-2-enofuranoside (7) from methyl 5-O-benzoyl-3-deoxy-3-nitro-β-d-xylofuranoside (2) through five steps in 13% overall yield is described. The nitroolefin 7 was treated with hydrazoic acid in the presence of trace of sodium azide, followed by hydrogenation and N-acetylation, to give a diastereoisomeric mixture of four triacetamido furanoside derivatives.
CORE STRUCTURES OF IRON-SULFUR COMPLEXES FROM MAGNETIC CIRCULAR DICHROISM
Authors: Muraoka Tsugufumi , Nozawa Tsunenori , Hatano Masahiro
Published: July 2006

The magnetic circular dichroism (MCD) spectra were measured for the first time on the rebredoxin model iron-sulfur complexes. The bands at around 390 and 490 nm were assigned to Faraday A terms from curve analysis, which indicated effective Td symmetries for the complexes. Furthermore the propriety as the rubredoxin model was discussed on the basis of the MCD spectra.
ACTIVE MOLTEN SALTS CATALYST FOR HYDROCRACKING OF ANTHRACENE
Authors: Kikkawa Shoichi , Nomura Masakatsu , Kubo Toshio , Nakatsuji Yohji
Published: July 2006

It was found that ZnCl2–CuCl melts showed an excellent hydrocracking activity for anthracene compared with that of molten ZnCl2 catalyst in view of increasing the yield of low boiling hydrocracked products. The difference of activities between ZnCl2–CuCl melts and ZnCl2 melts is discussed primarily based on the product distribution.
SYNTHESIS OF [3.3]METACYCLOPHANE
Authors: Shinmyozu Teruo , Inazu Takahiko , Yoshino Tamotsu
Published: July 2006

[3.3]Metacyclophane was synthesized by hydrolysis of tetraethyl [3.3]metacyclophane-2,2,11,11-tetracarboxylate (III), followed by decarboxylative chlorination and reduction. Compound III was obtained by the coupling reaction of m-bis(bromomethyl)benzene (I) and tetraethyl m-diethylbenzene-ω,ω,ω′,ω′ -tetracarboxylate (II) in the presence of sodium hydride as a base under high dilution conditions.
A NOVEL REACTION OF CHLORANIL WITH 1,4-DISUBSTITUTED PIPERAZINEDIONES
Authors: Tanaka Tatsuo
Published: July 2006

Reaction of 1,4-diphenyl-2,6-piperazinedione with chloranil in benzene at refluxing temperature afforded an adduct, 2,4,5,7-tetrachloro-10,12-diphenyl-3,6,9,11-tetraoxo-10,12-diaza-tricyclo[6.3.1.02,7]-4-dodecene, which was formed through dehydrogenation followed by 1,3-dipolar cycloaddition of chloranil to the intermediate mesoionic species. 4-Methyl-1-phenyl-2,6-piperazinedione reacted with chloranil to give a similar adduct.
THE MICHAEL TYPE REACTION OF O-SILYLATED KETENE ACETALS WITH α,β-UNSATURATED CARBONYL COMPOUNDS PROMOTED BY TITANIUM TETRACHLORIDE
Authors: Saigo Kazuhiko , Osaki Masaaki , Mukaiyama Teruaki
Published: July 2006

O-Silylated ketene acetals reacted with α,β-unsaturated carbonyl compounds at −78°C in the presence of TiCl4 or in the coexistence of TiCl4 and Ti(OPr-i)4 to afford the corresponding δ-ketoesters in good yields.
CATIONIC HYDRIDE COMPLEXES OF PALLADIUM
Authors: Moriyama Hiroshi , Saito Taro , Sasaki Yukiyoshi
Published: July 2006

A series of cationic hydride complexes of palladium [PdH(L)(PCy3)2]+BPh4− (PCy3 = tricyclohexylphosphine, L = pyridines, pyrazole and imidazole) have been synthesized from a new palladium hydride complex PdH(NO3)(PCy3)2 and characterized.
HYDROGEN KINETIC ISOTOPE EFFECTS IN SULFONYLOXYLATION AND AROYLOXYLATION OF ARENES
Authors: Kobayashi Michio , Usui Masao , Hisada Ryuki , Minato Hiroshi
Published: July 2006

Hydrogen kinetic isotope effects in the reactions between arenes and m-nitrobenzenesulfonyl peroxide and aroyl p-toluenesulfonyl peroxides have been investigated. In ionic sulfonyloxylations, no primary isotope effect was observed, whereas in free-radical sulfonyloxylations and aroyloxylations, some primary isotope effect was observed.
CATALYTIC ENANTIOSELECTION BY CHIRAL TRANSITION-METAL COMPLEXES. I. DEHYDROGENATION OF RACEMIC α-PHENYLETHANOL BY RuCl2(PPh3)3 AND (+)-NEOMENTHYLDIPHENYLPHOSPHINE
Authors: Ohkubo Katsutoshi , Hirata Keiichi , Yoshinaga Kohji , Okada Masahide
Published: July 2006

The enantioselective dehydrogenation of racemic (R-(+) and S-(−)) α-phenylethanol by RuCl2(PPh3)3 and (+)-neomenthyldiphenylphosphine at 180°C showed constant ratios of kR⁄kS in the absence of benzalacetone. The kR⁄kS value increased almost linearly with the benzalaceton concentration and decreased with the larger amounts of the chiral phosphine under the present reaction conditions.
EFFECTS OF SUBSTITUENTS ON THE ULTRAVIOLET SPECTRA OF THE PHOTOISOMERS OF BENZYLIDENEANILINES
Authors: Kobayashi Michio , Yoshida Masato , Minato Hiroshi
Published: July 2006

The UV spectra of the photoisomers of substituted benzylideneanilines are determined in solid matrix at 77K, and the conformations of the photoisomers are estimated from the effects of substituents on the spectra.
A CONVENIENT METHOD FOR N4-BENZOYLATION OP CYTIDYLIC AND DEOXYCYTIDYLIC ACIDS BY MEANS OF O-ETHYL S-BENZOYLDITHIOCARBONATE
Authors: Takaku Hiroshi , Shimada Yoshifusa , Morita Yoshiaki , Hata Tsujiaki
Published: July 2006

O-Ethyl S-benzoyldithiocarbonate was found to be a useful reagent for benzoylation of the 4-amino groups of cytidine 5′-phosphate and deoxycytidine 5′-phosphate. By use of the reagent, N4-benzoylcytidine and N4-benzoyldeoxycytidine were also obtained in high yields.
PROTON NMR STUDIES ON ANTIFERROMAGNETIC PHASE TRANSITION OF THE DANO CRYSTAL
Authors: Takizawa Osamu , Yoshioka Toshio , Ohya-Nishiguchi Hiroaki , Deguchi Yasuo
Published: July 2006

Proton NMR spectra of di-p-anisyl nitric oxide radical (DANO) crystal have characteristics of the antiferromagnetic state at low temperatures. The transition temperature to the magnetic ordered state was determined to be TN= 1.67 K ± 0.02 K from the temperature dependence of NMR line shift. The magnetic properties of the DANO crystal are discussed in terms of the magnitude of the resonance field shift.
SELECTIVE DEHYDRATION OF 1,3-DIOLS TO KETONES CATALYZED BY RHODIUM COMPOUNDS
Authors: Kaneda Kiyotomi , Wayaku Masami , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

The reaction of 1,3-diols with various rhodium compounds was carried out at 80°C for 48 hr. The dehydration products, mono-ketones were formed selectively in high yields. A RhCl3 –PPh3 (1:1) catalyst had the highest activity.
GROWTH OF TIN (IV) OXIDE CRYSTALS FROM FLUX OF B2O3–V2O5 SYSTEM
Authors: Shimada Shiro , Kodaira Kohei , Matsushita Toru
Published: July 2006

Needle crystals of SnO2 were grown from the melt of B2O3–V2O5 system containing Zn2SnO4. Increasing the soaking temperature and the V2O5 content of B2O3–V2O5 system tended to increase the size of crystals. The growth direction of the crystals was along the c-axis of SnO2.
A COMPARATIVE STUDY ON THE OXYGEN EXCHANGE OF C-, N-, AND O-NITROSO COMPOUNDS WITH H218O
Authors: Aoyama Masaaki , Takahashi Tomoji , Minato Hiroshi , Kobayashi Michio
Published: July 2006

Acid-catalyzed oxygen exchange of C-, N-, and O-nitroso compounds with 18O-enriched water is investigated. The rates of exchange increase in the order of C-, N-, and O-nitroso compounds, and nitrite esters exchange their oxygens with those of H218O fairly rapidly.
OPTICAL RESOLUTION OF N-BENZOYL-CIS-2-AMINOCYCLOHEXANECARBOXYLIC ACID BY PREFERENTIAL CRYSTALLIZATION
Authors: Nohira Hiroyuki , Watanabe Kyoko , Kurokawa Misao
Published: July 2006

(±)-N-Benzoyl-cis-2-aminocyclohexanecarboxylic acid has been resolved smoothly by preferential crystallization procedure in the form of its benzylamine salt. A typical run for this procedure has been presented.
A CONVENIENT METHOD FOR THE PREPARATION OF CARBOXYLIC ACID FLUORIDES
Authors: Mukaiyama Teruaki , Tanaka Toshio
Published: July 2006

Various carboxylic acid fluorides are prepared in good yields by treating carboxylic acids with 2-fluoro-1,3-dimethylpyridinium salts in the presence of tertiary amines such as triethylamine.
NO2 CATALYZED CHLORINATION OF ANTHRACENE BY METAL CHLORIDES
Authors: Sugiyama Takashi , Tanioka Koji , Ohno Atsuyoshi , Oka Shinzaburo
Published: July 2006

In the presence of nitrogen dioxide, aluminum chloride and some other metal chlorides have been found to be highly selective and regiospecific chlorinating agents for anthracene.
ADSORPTION AND CATALYTIC REDUCTION ACTIVITIES OF METAL-PHTHALOCYANINES FOR NITRIC OXIDE
Authors: Mochida Isao , Takeyoshi Kazuko , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

Some metal phthalocyanine complexes are found to adsorb NO and reduce it catalytically into N2O, NH3, and N2 with molecular hydrogen at 250°C or below.
EXCITED SINGLET AND TRIPLET PRODUCTS GENERATED FROM THE AIR OXIDATION OF SIMPLE KETONES AND CARBOXYLIC ACIDS IN ALKALINE APROTIC SOLVENTS
Authors: Kamiya Isao , Sugimoto Takashi
Published: July 2006

Using the indirect chemiluminescence technique, we have obtained evidences for the proposal that excited triplet acetone and benzoic acid were generated in the air oxidation of 3-methyl-2-butanone and benzoin respectively in alkaline aprotic solvents. On the other hand, it seemed that excited singlet benzaldehyde was generated from β-phenylpyruvic acid.
STRIPPING-LIKE PHENOMENON OF METAL DITHIZONATES IN GEL CHROMATOGRAPHY
Authors: Deguchi Toshio , Sanemasa Isao , Nagai Hideo
Published: July 2006

Dithizonates of some metals, Zn(II), Cd(II), Pb(II), Hg(II), Bi(III), Co(II) and Cu(II) were chromatographed on Sephadex LH-2O gel column using carbon tetrachloride as an eluent. Among them, the metal ions of Zn, Cd, Pb, Hg and Bi were adsorbed at the top of the column, and the liberated dithizone was easily eluted out of the column, while dithizonates of Co and Cu were eluted out unchanged. These phenomena are very curious but somewhat analogous to the stripping procedure in the solvent extraction process. The mechanism of this “stripping-like phenomenon” seems to be difficult to elucidate but it can be conveniently applied to the purification ,of dithizone reagent as well as to separate some metal dithizonates.
STRUCTURAL STUDIES OF ALOENIN; THE CRYSTAL STRUCTURE OF ITS AGLYCONE
Authors: Hirata Toshifumi , Kushi Yoshihiko , Suga Takayuki , Christensen Arild
Published: July 2006

The recently proposed structure of aloenin (II) has remained uncertain due to difficulty in interpreting the NMR spectra. The structure of its aglycone has now been determined by X-ray crystallography to be as in formula III, and aloenin has therefore been unambiguously confirmed to correspond to structure II.
AMINOMERCURATION XIV. A NOVEL SYNTHETIC ROUTE TO AMINO-ALCOHOLS
Authors: Hodjat-Kachani H , Perie J J , Lattes A
Published: July 2006

Olefins carrying a proximate hydroxyl group undergo efficient aminomercuration, thus affording aminoalcohols. In some cases this synthesis is of particular interest owing to the known therapeutic activity of the products.
THE SYNTHESIS OF l-α-AMINONITRILES
Authors: Kawashiro Katsuhiro , Yoshida Hideyuki , Morimoto Shiro
Published: July 2006

N-o-Nitrophenylsulfenyl(NPS)-l-α-amino acid(alanine, leucine, and phenylalanine) amides were dehydrated in POCl3-pyridine to yield the corresponding NPS-l-α-aminonitriles, which gave the l-α-aminonitrile hydrochlorides by treatment with anhydrous HCl. Optical purity of these nitriles was well retained.
PREPARATION AND CHARACTERIZATION OF MER AND FAC ISOMERS OF TRIS(MESO-2,4-PENTANEDIAMINE)COBALT(III) COMPLEX
Authors: Kojima Masaaki , Fujita Junnosuke
Published: July 2006

The mer and fac isomers of [Co(meso-ptn)3]3+ (meso-ptn = meso-2,4-pentanediamine) have been separated and resolved by column chromatography on SP-Sephadex. The structures of these isomers have been assigned on the basis of the electronic, circular dichroism, 1H- and 13C-NMR spectra.
A GENERAL ESTER SYNTHESIS VIA 2-LITHIO-2-METHYLTHIO-1,3-DITHIANE
Authors: Woessner Warren D
Published: July 2006

A facile synthesis of esters via nucleophilic reaction of the lithiated orthothioester (I) with halides, aldehydes, and ketones is described. The resultant substituted orthothioesters (III) are hydrolyzed to esters with mercuric salts in the presence of aqueous alcohol in high yield.
SENSITIVITY INCREASE OF ATOMIC ABSORPTION ANALYSIS OF VANADYL ION BY APPLYING PRE-ELECTROLYSIS
Authors: Kitamura Mitsutaka , Yamashita Kazuo , Imai Hideo
Published: July 2006

The sensitivity increase of atomic absorption analysis for vanadyl ion by applying pre-electrolysis is described. It is shown that pre-electrolysis results in V–O bond breaking and facilitates free atom population in flame.
THERMAL ADDITION REACTION OF CYCLOHEPTATRIENE TO SOME AROMATIC QUINONES: THE FORMATION OF vic-DITROPYLATION PRODUCTS
Authors: Takeshita Hitoshi , Mori Akira , Mametsuka Hiroaki
Published: July 2006

Thermal addition reaction of cycloheptatriene with some aromatic quinones was studied. In addition to ordinary Diels–Alder adducts, identified in the products were 2,3-ditropylcyclohex-5-ene-1,4-diones which were shown to be formed after series of tropylation, dehydrogenation, and further tropylation processes.
VINYL POLYMERIZATION. 347. A FORMATION OF FREE RADICAL BY THE REACTION OF BENZIDINE WITH METHYL METHACRYLATE IN THE PRESENCE OF Fe(III)-ION AND WATER
Authors: Imoto Minoru , Nakamura Yoshiaki , Ouchi Tatsuro
Published: July 2006

Benzidine, a carcinogenic compound, was found to be able to initiate the polymerization of methyl methacrylate in the presence of water and Fe(III)-ion. The reaction proceeded through a radical mechanism.
ISOLATION AND THE STRUCTURES OF TWO NEW ALKALOIDS, PETASITENINE AND NEOPETASITENINE FROM PETASITES JAPONICUS MAXIM.
Authors: Yamada Kiyoyuki , Tatematsu Hiroshi , Suzuki Masaaki , Hirata Yoshimasa , Haga Masanobu , Hirono Iwao
Published: July 2006

Two new pyrrolizidine alkaloids revealing strong hepatotoxic activity were isolated from Petasites japonicus Maxim., and their structures were deduced to be (3) and (4), respectively based on chemical and spectral evidence.
PHOTOCHEMICAL REDUCTION OF 9,10-o-BENZENO-4a,9,9a, 10-TETRAHYDRO-1,4-ANTHRAQUINONE
Authors: Maruyama Kazuhiro , Kitaguchi Nobuya , Otsuki Tetsuo
Published: July 2006

Irradiation of 9,10-o-benzeno-4a,9,9a,10-tetrahydro-1,4-anthraquinone 1 and xanthene 2 in benzene gave dihydro-monomer 3 and dihydrodimer 4 of 1 as the final products. The course of the reaction and the structure of the unstable intermediates were investigated by means of 1H-CIDNP technique.
AZIRIDINONES. CYCLOADDITION REACTION OF AZIRIDINONE WITH PHENYL ISOCYANATE
Authors: Kakimoto Masaaki , Kajigaeshi Shoji , Kanemasa Shuji
Published: July 2006

Aziridinone reacted with phenyl isocyanate to give two isomers of imidazolidine-2,4-dione which correspond to the cycloadducts of aziridinone to phenyl isocyanate.
BEZIEHUNGEN ZWISCHEN DER LÖSUNGSMITTELPOLARITÄT UND DEN PRODUKTVEROTEILUNGEN BEI DEN DIELS–ALDER-REAKTIONEN
Authors: Nakagawa Kiyoshi , Ishii Yasutaka , Ogawa Masaya
Published: July 2006

Die Beziehungen zwischen der Lösungsmittelpolarität und den Produktverteilungen bei den Diels–Alder-Reaktionen von Cyclopentadien an Acrylnitril oder Methylacrylat vurden untersucht. Die Produktverteilungen erwiesen sich als recht empfindlich gegenüber Lösungsmittelvariation. Zwischen der Lösungsmittelpolarität und den Produktver-teilungen ergaben sich gute Korrelationen, was dafür spricht, dass bei der konkurrierenden Diels–Alder-Reaktion die bevorzugte Addition durch polare Lösungsmittel noch mehr beschleunigt wird.
3-METHYLSULFONYL-3H-BENZ[d]AZEPINE
Authors: Takeuchi Isao , Ozawa Isao , Hamada Yoshiki , Masuda Hideyuki , Hirota Minoru
Published: July 2006

3-Methylsulfonyl-3H-benz[d]azepine was prepared by the reaction of methylsulfinylmethyl carbanion with isoquinoline N-oxide, and its structure was determined by spectroscopic measurements.
THE CENTRAL-CARBON-BONDED PALLADIUM(II) COMPLEXES OF ETHYL ACETOACETATE
Authors: Okeya Seichi , Kawaguchi Shinichi , Yasuoka Noritake , Kai Yasushi , Kasai Nobutami
Published: July 2006

The reaction of sodium tetrachloropalladate(II) with ethyl acetoacetate in aqueous alkaline solution afforded a key intermediate Pd(C6H9O3)2·\frac12H2O [1]. The compound 1 reacts with a base L such as pyridine, 2-methylpyridine, n-butylamine, benzylamine, or 2,2′-bipyridine, resulting in Pd(1-ethoxycarbonylacetonato-c1)2L2 [2]. The central-carbon-bonding of ethyl acetoacetate to palladium has been deduced from the IR and NMR spectra, and finally ascertained by the X-ray analysis of a compound with 2-methylpyridine as L.
PHOTODISSOCIATION OF SODIUM HALIDES IN THE AIR-ACETYLENE FLAME AS STUDIED BY MOLECULAR ABSORPTION FLAME SPECTROSCOPY
Authors: Furuta Naoki , Yoshimura Etsuro , Nemoto Yuko , Haraguchi Hiroki , Fuwa Keiichiro
Published: July 2006

Absorption spectra of sodium halides have been observed in the air-acetyrene flame. Those spectra show the meaningful absorptions with hyperfine structure in the ultraviolet reagion. The absorptions are due to photodissociation process of sodium halides in the flame, and the spectral parameters for the process have been estimated.
ASYMMETRIC OXIDATION OF SULFIDES WITH AN OPTICALLY ACTIVE SUBSTITUTED N-HALOGENOCAPROLACTAM
Authors: Sato Yoshiyasu , Kunieda Norio , Kinoshita Masayoshi
Published: July 2006

Oxidation of sulfides using an optically active substituted N-halogenocaprolactam, (+)-N-chloro-7-isopropyl-4-methyl-2-oxohexamethyleneimine, produces the corresponding optically active sulfoxides. The absolute configuration of sulfoxides obtained depends on the chirality of the caprolactam used. The steric course of this asymmetric oxidation is discussed.
ANODIC ACETOXYLATION OF SUBSTITUTED CYCLOPENTADIENES AND NOVEL SYNTHESIS OF ALLETHROLONE
Authors: Shono Tatsuya , Nishiguchi Ikuzo , Okawa Masahisa
Published: July 2006

The anodic oxidation of substituted cyclopentadienes in acetic acid brought about the facile introduction of acetoxy group into 1,4-positions in relatively good yields. A novel synthesis of allethrolone starting from 2-methyl-3-allylcyclopentadiene was achieved using this unique electrochemical process as a key step.