bluuebunny/crossref_metadata_2025_split huggingface dataset:
SYNTHESES OF POSITION ISOMERS OF DI-t-BUTYL-DIPHENYLDIDEHYDRO[14]ANNULENE AND A DIMETHOXY DERIVATIVE
Authors: Nomoto Tateo , Nakatsuji Shin’ichi , Nakagawa Masazumi 
Published: July 2006

Abstract
Two position isomers of di-t-butyl-diphenyldidehydro[14]annulene have been prepared according to a stepwise sequence of reactions and their physical properties were compared with those of another position isomer, 3,10-di-t-butyl-7,14-diphenyl-1,8-didehydro[14]annulene. The synthesis of 3, 10-di-t-butyl-6,13-dimethoxy-7,14-diphenyl-1,8-didehydro[14]annulene has been performed. The introduction of methoxy groups causes a hypsochromic shift with hypochromism and a bathochromic shift with strong hyperchromism of medium and longest wavelength bands of the electronic spectrum, respectively.
THE PHOTOLYSIS OF BENZYL AMINOACETATES
Authors: Kimoto Koichi , Tanabe Kunsei , Saito Shin , Umeda Yasusi , Takimoto Yasuyuki 
Published: July 2006

Abstract
The photolysis of benzyl aminoacetates (1a–1d) in benzene gave β-aminoethylbenzenes (2a–2d) and N,N-disubstituted glycines (3a–3d). Benzyl acetate (4) was also obtained in low yield. Solvent and quenching effect suggest the singlet pathway for this photoreaction.
PHOTOCHEMICAL CONVERSION OF 8-THIABICYCLO[3,2,1]OCT-3-EN-2-ONES INTO BRIDGED 3-THIETANONE DERIVATIVES
Authors: Tsuruta Haruki , Ogasawara Mitsuo , Mukai Toshio 
Published: July 2006

Abstract
A peculiar 3-thiethanone (III) was produced by the irradiation of cyclic β-ketosulfide (I). Upon treating with acid, III regenerate I, while with methanol, III afforded 4-thiacyclohept-5-enone (V). The photoreaction of II was also studied. The mechanisms of these reactions are discussed here.
ELECTRONIC ABSORPTION SPECTRA OF ANION RADICALS OF DIPHENYL SULFONE AND DIBENZOTHIOPHENE-S,S-DIOXIDE
Authors: Ito Osamu , Matsuda Minoru 
Published: July 2006

Abstract
The anion radicals of diphenyl sulfone and dibenzothiophene-S,S-dioxide produced by γ-irradiation showed intense absorption bands at 1030 nm and 850 nm, respectively. These absorption bands were assigned to the charge resonance bands from the energy diagrams including d-orbitals on sulfone groups, and the delocalization of an added electron on both phenyl rings was confirmed.
SYNTHESIS OF SILYL RUTHENIUM COMPLEXES, RuH3(SiR3)(PPh3)3
Authors: Kono Hiromichi , Nagai Yoichiro 
Published: July 2006

Abstract
Hydrosilanes react with RuH2(PPh3)4 to give RuH3(SiR3) (PPh3)3, where R3 = Et3, EtMe2, PhMe2, (EtO)3, Et2.H, PhMe.H, Ph2.H, Ph.H2 and cyclo-C6H11.H2. These apparently seven-coordinate silyl ruthenium(IV) complexes were characterized by i.r. and n.m.r. spectra.
9,10,13-TRIHYDROXY-11,15-OCTADECADIENOIC ACID AND RELATED FATTY ACIDS IN THE ROOTS OF KIDNEY BEAN (PHASEOLUS VULGARIS L., “BENI-KINTOKI”)
Authors: Takasugi Mitsuo , Anetai Masaki , Masamune Tadashi 
Published: July 2006

Abstract
In connection with studies on characterization of natural hatching-stimulants of soybean cyst nematode eggs, several fatty acids were isolated newly from the roots of kidney bean and identified as 4-hydroxy-1,12-dodecanedioic acid γ-lactone, 9,10,13-trihydroxy-11-and 15-octadecenoic acids, and 9,10,13-trihydroxy-11,15-octadecadienoic acid.
ALNUSERRUDIOLONE, A NEW C31-DAMMARANE-TYPE TRITERPENE FROM ALNUS SERRULATOIDES CALL.
Authors: Suga Takayuki , Hirata Toshifumi , Iwata Nobuo 
Published: July 2006

Abstract
The structure of alnuserrudiolone, a new C31-dammarane-type triterpene isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae), has been elucidated to be (20s)-12β,20-dihydroxy-24-methylene-dammaran-3-one (I) by a combination of chemical and spectroscopic methods.
REACTION OF 2-PHENYL-1-AZIRINE WITH COPPER BROMIDES. SELECTIVE FORMATION OF TWO TYPES OF BROMO-DIMERIC COMPOUNDS DEPENDING ON THE SOLVENTS
Authors: Hayashi Ken-ichi , Isomura Kazuaki , Taniguchi Hiroshi 
Published: July 2006

Abstract
Treatment of 2-phenyl-1-azirine in cyclohexane with Cu(II) bromide afforded ω-bromoacetophenone azine, but in carbon tetrachloride gave 2-bromomethyl-2,4-diphenyl-2H-imidazole via 2-bromo-3,5-diphenyl-1,4-diazabicyclo[3.1.0]hex-3-ene.
REACTION OF THIOPHENE WITH ATOMIC HYDROGEN IN GAS PHASE
Authors: Horie Osamu , Hanh Nguyen H , Amano Akira 
Published: July 2006

Abstract
Thiophene was subjected to the reaction with hydrogen atom under reduced pressure in the temperature range of 300 – 70°K using a discharge-flow reactor. Butadiene, butenes, n-butane, propylene, and C2 hydrocarbons are the main products, and no formation of sulfur-containing products other than hydrogen sulfide is observed.
MCD STUDIES OF o,o′-BRIDGED BIPHENYLS
Authors: Tajiri Akio , Uchimura Hiroyuki , Hatano Masahiro 
Published: July 2006

Abstract
The magnetic circular dichroism (MCD) spectra of o,o′-bridged biphenyls were measured, at room temperature, in the wavelength regions of 200 nm to 350 nm. They all showed the Faraday B terms caused by a magnetic coupling of the lower-lying non-degenerate electronic states. A careful inspection of the MCD spectra with the aid of the results of the CNDO calculations led to preferable spectroscopic assignments of the absorption bands of o,o′-bridged biphenyls.
ON THE LUMINESCENCE LIFETIMES AND THEIR PRESSURE EFFECT OF SOME ONE-DIMENSIONAL Pt-COMPLEXES
Authors: Hara Yoji 
Published: July 2006

Abstract
The luminescence lifetimes in K2Pt(CN)4·3H2O, BaPt(CN)4·4H2O and MgPt(CN)4·7H2O were measured at 1 atom. and higher hydrostatic pressures up to 7.2 kbar at room temperature. Two longer components lengthen anomalously by a factor of ∼ 30 with a decrease in the Pt–Pt distance from 3.50 to 3.16 Å.
LIQUID PHASE REDUCTION OF NO TO N2 BY USE OF TRANSITION METAL-SCHIFF’S BASE COMPLEXES
Authors: Sakai Tomoya , Kuroda Yoshitaka , Goto Seiichi , Yano Yoshio 
Published: July 2006

Abstract
Catalytic actions of several transition metal-Schiff’s base complexes were examined on the reduction of NO to N2 in DMF solution. By use of Co(II)(Salen) or Fe(II)(Salen) and NaBH4 as a reducing reagent, thorough reduction of NO to N2 was observed.
RING CLEAVAGE REACTION OF CERTAIN 5,6-DIHALO-SUBSTITUTED-2-NORBORNENEOXIDES
Authors: Yanagida Yuji , Sakon Yutaka , Nomura Masakatsu , Kikkawa Shoichi 
Published: July 2006

Abstract
Ring cleavage reactions of trans- and endo-cis-5,6-dichloro-(or dibromo-) 2-norbornene oxides by hydrogen halides have been investigated. Normal trans ring cleaved products were obtained in the case of trans-5,6-dihalonorbornene oxides, while the cleavage reaction of endo-cis-5,6-dihalonorbornene oxides gave the abnormal cleaved products via transannuler rearrangement of endo halogen substituent toward the resulting carbonium ion.
EVIDENCE FOR THE BIOGENESIS OF HALOGENATED MYRCENES FROM THE RED ALGA CHONDROCOCCUS HORNEMANNI
Authors: Burreson B Jay , Woolard Frank X , Moore Richard E 
Published: July 2006

Abstract
Several new halogenated monoterpenes (3–6,10–15) have been isolated from Hawaiian Chondrococcus hornemanni which suggest that the halogenated myrcenes are formed by the enzymatic addition of BrCl followed by dehydrohalogenation.
NATURE OF THE EXCITED TRIPLET STATES IN THE PHOTOLYSIS OF O-ACYLOXIMES
Authors: Yoshida Masayuki , Sakuragi Hirochika , Nishimura Toshihiro , Ishikawa Shun-ichi , Tokumaru Katsumi 
Published: July 2006

Abstract
The triplet states of O-acyl aromatic ketoximes, RCO2N=CR1R2 (I, II, and III), undergo homolytic cleavage into iminyl radicals, R1R2C=N·, and acyloxyl radicals, RCO2·. The triplet states have their excitation energies which are close to those of their parent ketones, R1R2C=O, and are abundant in π,π* character. The excitation energies are dissipated through cleavage of the N–O bonds.
POLAROGRAPHIC STUDIES ON REDOX REACTIVITY OF POLYMER–HEMIN COMPLEX IN A HYDROPHOBIC MICROENVIRONMENT
Authors: Tsuchida Eishun , Honda Kenji 
Published: July 2006

Abstract
When hemin was bound to partially quaternized polyvinylpyridine and such additives as sodium chloride, sodium lauryl sulfate and polymethacrylic acid were added, it was possible to lower the redox potential of the central ferric ion of hemin and to control the redox reactivity of hemin arbitrarily owing to the change in the property of microenvironment around hemin.
A NEW SYNTHESIS OF VITAMIN A
Authors: Mukaiyama Teruaki , Ishida Akihiko 
Published: July 2006

Abstract
A new synthesis of vitamin A was successfully accomplished by reducing retinal, prepared by the reaction of 3-methyl-1-trimethylsiloxy-1,3-butadiene (III) with β-ionylideneacetaldehyde dimethyl acetal (VII) followed by the elimination of methanol with tertiary amine such as 1,5-diazabicyclo[5.4.0]undecene-5. The intermediate, β-ionylideneacetaldehyde (V), was also prepared according to the same procedure starting from β-cyclocitral dimethyl acetal (II).
CATALYTIC CONVERSION OF PROPYLENE INTO ACETYLENE AND BUTADIENE OVER ION-EXCHANGED ZEOLITES
Authors: Mochida Isao , Ikeda Yoshimasa , Fujitsu Hiroshi , Takeshita Kenjiro 
Published: July 2006

Abstract
It was found that propylene was catalytically converted into acetylene and butadiene accompanied with the foramtion of coke at 150°–250° over ion-exchanged zeolites, although the yield and the catalyst life were insufficient. The activity of the ion is found in the order of Ca&gt;Zn&gt;Mn&gt;H&gt;Ni&gt;Ag&gt;Co&gt;Fe&gt;Cu. The catalytic activity may be related with the Lewis acidity.
DISPROPORTIONATION OF XYLENE OVER PARTIALLY METAL EXCHANGED H-MORDENITE
Authors: Yashima Tatsuaki , Iwase Osamu , Hara Nobuyoshi 
Published: July 2006

Abstract
It was found that the shape-selective disproportionation of xylene effectively proceeded over the partially exchanged H-mordenite catalyst by the cations with a suitable ionic radius(ca. 0.07nm), and produced 1,2,4-trimethylbenzene in a high selectivity(84%).
PREPARATION OF CHLOROCARBONYLBIS(TRIPHENYLPHOSPHINE)RHODIUM FROM TRIS(TRIPHENYLPHOSPHINE)CHLORORHODIUM, CARBON DIOXIDE, AND MOLECULAR HYDROGEN
Authors: Koinuma Hideomi , Yoshida Yasuhiko , Hirai Hidefumi 
Published: July 2006

Abstract
Chlorocarbonylbis(triphenylphosphine)rhodium was obtained by the reaction of tris(triphenylphosphine)chlororhodium with carbon dioxide and hydrogen. Use of a polar aprotic solvent was effective for the reaction. This reaction indicates carbon dioxide is reduced by molecular hydrogen on a rhodium complex and fixed in the form of a carbonyl complex.
MICROWAVE SPECTRA OF DIMETHYLETHER IN THE EXCITED TORSIONAL STATES
Authors: Hayashi Michiro , Imachi Misako 
Published: July 2006

Abstract
Microwave spectra of dimethylether and its deuterated species, (CD3)2O, in the excited torsional states were studied in relation to the top–top coupling problem of internal rotation of two methyl groups. A preliminary analysis of the observed splittings of the spectra was carried out in order to evaluate V3, V′ and V″ values in the potential function.
THE LOWEST TRIPLET STATE OF 9,10-ANTHRAQUINONE
Authors: Narisawa Takatoshi , Sano Mizuka , I’haya Yasumasa J 
Published: July 2006

Abstract
The lowest energy absorption peak was found at 22154.0 cm−1 for a thick single crystal of 9,10-anthraquinone at 4.2 K. From the analysis of Zeeman absorption patterns for the intense, sharp peaks observed at 22319.3 and 22357.9 cm−1, the lowest triplet state was assigned to 3B1g.
ANTINEOPLASTIC AGENTS. SYNTHESIS OF SOME 1-SUBSTITUTED 5-FLUOROURACIL DERIVATIVES
Authors: Tada Masao 
Published: July 2006

Abstract
Reactions of 5-fluorouracil with various acyl chlorides, alkanesulfonyl chlorides, and arenesulfonyl chlorides In dioxane or dimethylformamide gave the 1-substituted derivatives. Some of these products showed markedly antitumor activity.
SODIUM ISOTOPIC EXCHANGE RATE BETWEEN CRYSTALLINE ZIRCONIUM PHOSPHATE AND MOLTEN NaNO3
Authors: Inoue Yasushi , Yamada Yoshimune 
Published: July 2006

Abstract
The isotopic exchange rate of sodium ion between crystalline zirconium phosphate and molten NaNO3 has been measured at 312°C and 362°C by batch method. The equilibrium was reached within 20 minutes at either temperature, and the rate was very rapid as compared with that of sodium-potassium ion exchange.
AN EFFICIENT METHOD FOR CYCLOPROPANATION VIA APROTIC DIAZOTIZATION OF 3-(TRI-n-BUTYLSTANNYL)PROPYLAMINES
Authors: Teratake Shuji , Morikawa Shun-ichi 
Published: July 2006

Abstract
Reactions of 2-lithio-3-(tri-n-butylstannyl)propionitrile (1) with alkyl halides or carbonyl compounds gave the corresponding 2-substituted 3-(tri-n-butylstannyl)propionitriles (2), which were reduced to amines (4) and then diazotized to give alkyl cyclopropanes or cyclopropanemethanols, respectively, in moderate overall yields.
HYDROGEN BOND IN THE NH4+-TETRANACTIN COMPLEX
Authors: Nawata Yoshiharu , Sakamaki Toshio , Iitaka Yoichi 
Published: July 2006

Abstract
The molecular structure of the NH4+-tetranactin complex was determined by the X-ray diffraction method. The ammonium H atoms form strong hydrogen bonds to the ether 0 atoms in tetrahedral directions. They also interact electrostatically with the carbonyl 0 atoms. No signs of rotational disorder were detected for the NH4+ ion at 21°C.
THE AMINATION OF FATTY ACIDS USING Cu(II)–AMMINE COMPLEX
Authors: Kamiyama Tsutomu , Inoue Masami , Enomoto Saburo 
Published: July 2006

Abstract
Fatty acids were coupled with ammonia to amino acids in the presence of Cu(II)–ammine complex. In aqueous solution, using ammonium acetate, the yield of glycine reached the maximum value of 15.8% after 3 hr at 140°C. The yield and the distribution of amino acids varied with fatty acids used.
PHOTOCHEMICAL METHYLATION OF INORGANIC MERCURY IN THE PRESENCE OF MERCURIC SULFIDE
Authors: Akagi Hirokatsu , Fujita Yuzaburo , Takabatake Eigo 
Published: July 2006

Abstract
Photosensitized methylation of mercuric acetate in aqueous acetic acid solutions in the presence of mercuric sulfide has been studied. Mercuric sulfide solubilizes rapidly in the dark coupled with the reduction of inorganic mercury, and the resulting sulfur atoms photo-polymerize under irradiation with a blacklight-lamp to give a milky white suspension, photo-sulfur, which acts as an efficient photosensitizer for the production of methylmercury.
“DOUBLE ASYMMETRIC REDUCTION” OF (−)MENTHYL BENZOYLFORMATE USING CATALYTIC HYDROSILYLATION
Authors: Ojima Iwao , Nagai Yoichiro 
Published: July 2006

Abstract
Effective double asymmetric reduction of (−)menthyl benzoylformate was realized using hydrosilylation catalyzed by rhodium(I) complex catalysts. The effect of the (−)menthyl group was estimated.
RING-OPENING REACTION OF PALLADIACYCLOPENTADIENE COMPLEX WITH N,N-DICHLOROAMINE AND -AMIDE
Authors: Suzuki Hiroharu , Itoh Kenji , Matsuda Isamu , Ishii Yoshio 
Published: July 2006

Abstract
Reactions of the palladiacyclopentadiene complex, Pd(C4R4)(bipy) [R=COOCH3], with N,N-dichloroamine and -amide afforded three different σ-4-chloro-1,2,3,4-tetrakis(methoxycarbonyl)buta-1,3-dienylpalladium complex [II], [III], and [IV]. No nitrene adducts were formed.
APPLICATIONS OF ADIABATIC RAPID PASSAGE TO CORRELATION NMR SPECTROSCOPY. II. MEASUREMENT OF SPIN-LATTICE RELAXATION TIMES
Authors: Ozawa Hiroshi , Arata Yoji 
Published: July 2006

Abstract
An adiabatic rapid passage method in correlation NMR spectroscopy has been proposed for measurements of spin-lattice relaxation times, and an illustrative example is given.
CARBONIZATION OF AROMATIC COMPOUNDS IN MOLTEN SALT
Authors: Ota Etsuro , Otani Sugio 
Published: July 2006

Abstract
Aromatic compounds, such as naphthalene, anthracene, and biphenyl, were heated in mixed molten salt(AlCl3:KCl:NaCl=3:1:1 mole) for 10 hours at 300°C, giving carbon in good yields. The carbon was obtained mostly in the form of powder and partly film and plate, and its crystallite thickness after heating at 2800°C ranges from 50Å to 700Å.
THE LIGHT-EMITTER IN BIOLUMINESCENCE OF THE SEA CACTUS CAVERNULARIA OBESA
Authors: Shimomura Osamu , Inoue Shoji , Goto Toshio 
Published: July 2006

Abstract
The structure of the light-emitter extracted from the sea cactus Cavernularia obesa was determined as 2-(p-hydroxyphenylacetamido)-3-benzyl-5-(p-hydroxyphenyl)pyrazine. This result strongly suggests the structure of coelenterate luciferyl sulfate.
PHOTODIMERIZATION OF 3,3-BIPHMYLME-1-BROMO-1-PHENYLALLENE
Authors: Ueda Kozaburo , Toda Fumio 
Published: July 2006

Abstract
Photodimerization of the title allene afforded 1,1-biphenylene-3-bromo-2-bromobenzylidene-4-fluoren-9-ylidene-3-phenylcyclobutane (2), whereas the photodimerization in the presence of fluorenone afforded 1,1,6,6-bis(biphenylene)-4,5-dibromo-3,4-diphenylhexa-1,2,5-triene (9).
A FACILE HYDROLYSIS OF HYDROPHOBIC ESTERS BY CYCLO(d-LEU-l-HIS)
Authors: Imanishi Yukio , Sugihara Toshiharu , Tanihara Masao , Higashimura Toshinobu 
Published: July 2006

Abstract
In the hydrolysis of p-nitrophenyl laurate, cyclo(d-Leu-l-His) was much more effective catalyst than imidazole, the corresponding linear peptide and cyclo(l-Leu-l-His). The importance of binding the ester by the catalyst, and of keeping the isobutyl group of the d-leucyl residue and the imidazole group of the l-histidyl residue into a juxtaposition with the aid of the rigid cyclic backbone was suggested.
A 1,3-DIPOLE IN SULFILIMINE-PHOSPHINE SYSTEM (III) ACID ANHYDRIDE-, ESTER-, AND AMIDE-CONDENSATIONS BY SULFILIMINE-PHOSPHINE SYSTEM
Authors: Aida Tetsuo , Furukawa Naomichi , Oae Shigeru 
Published: July 2006

Abstract
Alkyl phenyl N-p-tosylsulfilimine and triphenylphosphine reacted with various carboxylic acids affording their anhydrides. The reaction was successfully extended to an ester- or amide-condensation reaction. These results can be interpreted by the initial formation of a 1,3-dipole between the sulfilimine and the phosphine.
EMISSION SPECTRA OF CH+ PRODUCED FROM CH4 AND C2H2 BY CONTROLLED ELECTRON IMPACT
Authors: Tsuji Masaharu , Ogawa Teiichiro , Nishimura Yukio , Ishibashi Nobuhiko 
Published: July 2006

Abstract
Under the controlled electron-impact excitation (0–450 eV) of CH4 and C2H2 at low pressures, photoemission was observed from such excited fragments as H, CH, CH+, C2 and C4H2+. The excitation function and the appearance potential of the CH+ emission were measured, and the dissociation process was discussed.
CHEMISTRY OF NITROSOIMINES. IX. ESCA STUDY OF 3-SUBSTITUTED 2-NITROSOIMINO-2,3-DIHYDROBENZOTHIAZOLES: MESOIONIC STRUCTURE
Authors: Akiba Kin-ya , Hisaoka Motoyuki , Inamoto Naoki , Ohta Toshiaki , Kuroda Haruo 
Published: July 2006

Abstract
Core electron binding energies of 3-substituted 2-nitrosoimino-2,3-dihydrobenzothiazoles (1) and related compounds were measured by ESCA to show large contribution of mesoionic structures for 1 and this was also supported by observed chemical shifts (NMR) of 3-methyl groups of benzothiazolines.
cis-DIOXO(ACETYLACETONATO)(1,10-PHENANTHROLINE)VANADIUM(V)
Authors: Isobe Kiyoshi , Ooi Shun’ichiro , Nakamura Yukio , Kawaguchi Shinichi , Kuroya Hisao 
Published: July 2006

Abstract
The reaction of oxobis(acetylacetonato)vanadium(IV) with 1,10-phenanthroline in methylene chloride under aerobic conditions afforded diamagnetic dioxo(acetylacetonato)(1,10-phenanthroline)vanadium(V). The cis configuration of this compound was concluded on the basis of IR and Raman data, and confirmed by the single crystal X-ray analysis. The geometry of this mixed ligand complex is a distorted octahedron. The V-O(oxide anion) distances are 1.613(4) and 1.670(5)Å, the O-V-O angle being 105.5(2)°. The appreciable trans influence of the oxide anion is reflected on the V-N and V-O(acetylacetonate) distances.
THREE ISOMERS OF DINITROOXALATODIAMMINECOBALTATE(III) COMPLEX
Authors: Ito Teiichi , Shibata Muraji 
Published: July 2006

Abstract
Three isomers of the dinitrooxalatodiamminecobaltate(III) complex have been isolated; the cis-cis- and trans(NO2)-isomers have been obtained from the reaction mixture of the cis-cis-[Coox(H2O)2(NH3)2]+ complex and KNO2, the remaining trans(NH3)-isomer from that of the [Co(NO2)4(NH3)2]− complex and oxalic acid.
THE CARBONYLATION OF ACETYLENIC COMPOUNDS CATALYZED BY PALLADIUM-BLACK
Authors: Mori Kunio , Mizoroki Tsutomu , Ozaki Atsumu 
Published: July 2006

Abstract
Palladium-black is a highly active catalyst in the presence of hydrogen iodide in methanol for α-monocarbonylation of phenylacetylene, methylacetylene, and acetylene to give methyl atropate, methyl methacrylate, and methyl acrylate respectively. Triphenylphosphine or triphenylarsine added to the reaction mixture increases the selectivity to β-carbonylated products.
CONFORMATIONAL ISOMERS OF 4H-CHROMENE CONFORMATION OF 4H-PYRAN
Authors: Kawato Toshio , Murase Ichiro 
Published: July 2006

Abstract
By the condensation of salicylaldehyde and acetylacetone, isomeric 3-acetyl-4-diacetylmethyl-2-methyl-4H-chromenes were prepared. From the fact that a pair of conformational isomers of these compounds exists, a boat structure of 4H-pyran was proposed.
ELECTRONIC SWITCHING IN PYRANTHRONE THIN FILM
Authors: Sakai Yoshiro , Sadaoka Yoshihiko 
Published: July 2006

Abstract
Bistable field- and thermal-induced switching between a “ON” state and a “OFF” state was observed in pyranthrone thin film by using surface type cell with gold electrodes. The transformation from the “OFF” state to the “ON” state is caused by the avalanche of electrons at the negative biased electrode.
HIGHLY EFFICIENT CHROMATOGRAPHIC RESOLUTION OF [Co(en)3]3+ ION WITH A COLUMN OF TA(ES)-SEPHADEX CONTAINING d-TARTRATE GROUPS
Authors: Fujita Miho , Yoshikawa Yuzo , Yamatera Hideo 
Published: July 2006

Abstract
Sephadex cation exchanger with d-tartrate groups was newly prepared. This cation exchanger was applied to column chromatographic resolution of [Co(en)3]3+ and complete resolution was accomplished with high efficiency using an aqueous solution of sodium l-tartrate as the eluent.
DIELECTRIC BEHAVIOR OF 2-METHYL-2-PROPANOL IN BENZENE AND PYRIDINE SOLUTIONS. II
Authors: Sato Hiroshi , Koshii Taro , Takahashi Hiroaki , Higasi Keniti 
Published: July 2006

Abstract
Dielectric measurements have been made for 2-methyl-2-propanol in benzene and pyridine solutions at four temperatures. The activation enthalpy and entropy of the principal relaxation of the alcohol decrease upon the addition of these solvents. The mechanism of the principal relaxations of alcohols is discussed from the viewpoint of cluster formation by hydrogen bonds.
PHOTOELECTRON SPECTRUM OF MALONALDEHYDE
Authors: Nishijima Chiho , Nakayama Hiroaki , Kobayashi Tsunetoshi , Yokota Katsuyuki 
Published: July 2006

Abstract
The photoelectron spectrum (PES) of malonaldehyde was measured and assigned in comparison with those of acetylacetone, trifluoroacetylacetone, and hexafluoroacetylacetone. The first and the second bands of malonaldehyde were attributed to the ionizations from the b2π and the b1n orbitals, respectively, on the basis of the methyl and trifluoromethyl substituent effects and the PES result of acetylacetone.
OLIGONUCLEOTIDE STUDIES. XI. DETERMINATION OF BASIC IONIZATION CONSTANTS OF GUANYLYL-3′,5′-GUANOSINE
Authors: Ogasawara Naotake , Inoue Yasuo 
Published: July 2006

Abstract
From circular dichroic data, by utilyzing the method developed by Ang for determining the overlapping pK values, basic ionization constants have been evaluated for guanylyl-3′,5′-guanosine. This work establishes the first instance of the determination of the apparent ionization constants for the two protonation steps involved in homodinucleotides. A change of the circular dichroism with pH is convincing evidence for the existence of intermediate stacked monoprotonated species.
13C NMR SPECTRA OF ALKENYLBORANES. EVIDENCE FOR THE PRESENCE OF π-CHARACTER IN THE B–C BOND
Authors: Yamamoto Yoshinori , Moritani Ichiro 
Published: July 2006

Abstract
The strong deshieldlng of the β-carbon atom in the 13C NMR spectra of α,β-unsaturated alkenylboranes supports the presence of π-character in the B–C bond.