bluuebunny/crossref_metadata_2025_split huggingface dataset:
TEMPERATURE DEPENDENCE OF ESR SIGNAL OF ISOPROPANOL RADICAL FORMED BY UV IRRADIATION
Authors: Katayama Akiko , Ishikura Seizo , Itoh Hiroyuki , Kita Hideaki 
Published: July 2006

Abstract
ESR signals of isopropanol radical were observed at various temperatures. Methyl groups of the radical were found to freely rotate down to 77 K, but to be in a frozen state at 4 K. Experimental results were discussed with the results calculated by INDO. A specially designed Dewar vessel was used for measurements at 77 K and 4 K.
SYNTHESIS OF DIBENZO[f,l]- 8,10-BISDEHYDRO[17]ANNULENONE
Authors: Ojima Juro , Kimura Akihiko , Yokoyama Tai 
Published: July 2006

Abstract
An annelated [17]annulenone (3) was prepared starting from o-ethynylcinnamaldehyde (1) in order to examine the effect of annelation on the ring current of the inner seventeen membered ring. It was found that two benzene rings reduce a paramagnetic ring current arising from polarization of a carbonyl group in the inner ring.
THE SYNTHESIS OF Dl-TETRAHYDROANHYDROAUCUBIGENONE
Authors: Obara Heitaro , Kimura Hiroshi , Onodera Jun-ichi , Suzuki Masanobu 
Published: July 2006

Abstract
The racemate of tetrahydroanhydroaucubigenone (III), one of the derivatives of aucubin (I), was synthesized by the photo-irradiation of 2-(2′-nitrosoxyethyl)-7-oxabicyclo [3,3,0] octan-3-one (XV) which was obtained from 2-ethoxycarbonyl-7-oxabicyclo [3,3,0] octan-3-one (VIII) through seven steps.
SELECTIVE CARBON–CARBON BOND FORMING REACTIONS VIA S-ALLYL DITHIOCARBAMATES. REDUCTIVE DESULFURIZATION OF ALLYLIC DITHIOCARBAMATES
Authors: Nakai Takeshi , Shiono Hiroyuki , Okawara Makoto 
Published: July 2006

Abstract
A convenient method for the selective conversion of alkyl halides (R’X) to the olefins, R’CH=C(R)CH3, was established by α alkylation of the lithium salts of allylic dithiocarbamates (CH2=C(R)CH2SCSNMe2;R=H or Me) followed by reductive desulfurization of the α-coupled products with the specific Raney Ni. Dependence of regioselectivity in the reductive fission of the dithiocarbamate group upon both substrate and reducing agent is described in some details.
SYNTHESIS OF NEOBAVAISOFLAVONE
Authors: Nakayama Mitsuru , Hayashi Shûichi , Masumura Mitsuo , Horie Tokunaru , Tsukayama Masao , Yamada Toshihide 
Published: July 2006

Abstract
Condensation of 7-benzoyldaidzein (III) with 2-methyl-3-buten-2-ol gave 7-benzoyl-3′-(3-methyl-2-butenyl)daidzein (IV). Hydrolysis of IV with dilute alkali gave 3′-(3-methyl-2-butenyl)daidzein (neobavaisoflavone) (I), which was converted into isoneobavaisoflavone (VI) when heated with formic acid. 7-Benzyldaidzein (VII) was condensed with 2-methyl-3-buten-2-ol to give a chroman derivative (VIII), which was converted into VI by hydrogenolysis.
THE SYNTHESIS OF 2-AZA-ADENOSINE-3′,5′-CYCLIC PHOSPHATE VIA 1,N6-ETHENO-ADENOSINE-3′,5′-CYCLIC PHOSPHATE
Authors: Yamaji Nobuyuki , Kato Motohiko 
Published: July 2006

Abstract
Treatment of 2-aza-1,N6-etheno-c-AMP with NBS or Br2 under mild conditions gave 2-aza-c-AMP in a high yield. Therefore, the route c-AMP→2-aza-1,N6-etheno-c-AMP→2-aza-c-AMP offers an excellent way to synthesize the last compound.
SYNTHESIS OF 11-DESOXY-12-METHYLPROSTAGLANDINS
Authors: Godoy Libertad , Guzmán Angel , Muchowski Joseph M 
Published: July 2006

Abstract
The conjugate addition of lithium dimethyl copper to the tetrasubstituted enone (3b) gave a mixture of the keto esters (4a) and (4b), which was converted into the 11-desoxy-12-methylprostaglandins (14b), (15b), (16a) and (17a).
REACTIVITIES OF ALLYLCHLORIDES IN THE FRIEDEL-CRAFTS REACTION CATALYZED BY TUNGSTEN HEXACHLORIDE
Authors: Mochida Isao , Takeshita Kenjiro , Ohgai Michiharu , Tanaka Takao , Seiyama Tetsuro 
Published: July 2006

Abstract
The reactivities of substituted allyl chlorides have been studied in the alkylation reaction catalyzed by WCl6. The primary products were allyl benzenes, however, they suffered consecutive hydrochlorination to the extent, which depended on their structure. The reactivity order of the allyl chlorides was trans-CH3CH=CHCH2Cl&gt;CH2=CHCH2Cl&gt; trans-ClCH=CHCH2Cl&gt;cis-ClCH=CHCH2Cl. This order may be explained in terms of electronic effects of substituent groups in the polarized-complex intermediates.
INFRARED AND MASS SPECTRAL STUDIES OF COMPLEXES OF BIS(HEXAFLUOROACETYLACETONATO)METAL(II) WITH 1,10-PHENANTHROLINE
Authors: Izumi Fujio , Kurosawa Ryoko , Kawamoto Hiroshi , Akaiwa Hideo 
Published: July 2006

Abstract
Mixed ligand complexes of the type M(hfa)2phen were prepared and IR, DTA-TG and MS were measured in order to investigate the stabilities of these complexes. Exceptional properties were observed for the Cu(II) complex on IR and MS measurements. The marked weakening of Cu–O bonds in the Cu(II) adducts is ascribed to the Jahn–Teller effect.
THE SYNTHESIS OF HYPACRONE, A NOVEL SECO-ILLUDOID SESQUITERPENE FROM HYPOLEPIS PUNCTATA METT.
Authors: Hayashi Yuji , Nishizawa Mugio , Sakan Takeo 
Published: July 2006

Abstract
The short step synthesis of hypacrone [1] was completed by the condensation of cyclopentenone [4] (C8 unit) with 1,1-diacetylcyclopropane [6] (C7 unit), confirming the unique seco-illudane structure of this compound.
A STUDY OF COBALT COMPLEXES BY X-RAY PHOTOELECTRON SPECTROSCOPY
Authors: Haraguchi Hiroki , Fujiwara Kitao , Fuwa Keiichiro 
Published: July 2006

Abstract
Cobalt(II and III) complexes including Vitamin B12 have been investigated by X-ray photoelectron spectroscopy. Cobalt(II) and cobalt (III) complexes show the 2p1⁄2–2p3⁄2 peak separation of 16.0±0.3 eV and 15.1±0.3 eV, respectively. The data of the binding energies for Co 2p1⁄2, Co 2p3⁄2, N ls and S 2p in cobalt complexes are also presented.
HALOGENOBENZOQUINOPHTHALONE AS A NEW PIGMENT TO REPLACE CADMIUM YELLOW. Part II.
Authors: Matsuoka Masaru , Oda Hironori , Kitao Teijiro 
Published: July 2006

Abstract
5,6,7,8-Tetrabromo-3′-hydroxybenzo[b]quinophthalone has been developed as a new pigment to replace cadmium yellow. This compound is very similar to cadmium yellow in color and has excellent pigment properties. The effects of bromo substituent of benzoquinophthalones on thermal behavior and on solubility are also discussed.
13C NMR SPECTRA AND BONDING SITUATION OF THE B–C BOND IN ALKYNYLBORANES
Authors: Yamamoto Yoshinori , Moritani Ichiro 
Published: July 2006

Abstract
13C NMR spectra of boron substituted alkynes reveal that the β-carbon is deshielded by ca. 21 ppm by a B(O-n-C4H9)2 group. This clearly indicates the presence of a B–C π-bonding in alkynylboranes.
THE SYNTHESIS OF 2-HYDROXY-3H-CYCLOHEPT[a]AZULEN-3-ONE (AZULENO[2,1-d]TROPOLONE) AND ITS METHYL ETHERS
Authors: Saito Motoyasu , Morita Tadayoshi , Takase Kahei 
Published: July 2006

Abstract
2-Hydroxy-3H-cyclohept[a]azulen-3-one (azuleno[2,1-d]tropolone) (2) was synthesized, starting from 1,2-diformylazulene (3). Methylation of 2 yielded two kinds of methyl ethers (4 and 6), differing from benzotropolones. In trifluoroacetic or dil. sulfuric acid, 2, 4 and 6 exist in cyclohept[a]azulenylium ions (2a, 4a and 6a).
THE HEAVY ATOM EFFECT ON THE PHOTOCHEMICAL REDUCTION AND ADDITION OF N-ACETYLDIPHENYLKETIMINE WITH TOLUENE: EVIDENCE FOR THE MECHANISM THROUGH THE EXCITED IMINE OTHER THAN THE CHEMICAL SENSITIZATION MECHANISM
Authors: Toshima Naoki , Asao Shuichiro , Hirai Hidefumi 
Published: July 2006

Abstract
The photoreaction of N-acetyldiphenylketimine (l) with toluene was promoted by various kinds of halogenated solvents. This phenomenon was confirmed as an external heavy atom effect. The presence of this effect shows evidence that the excited state of the imine 1 has an ability to abstract a hydrogen atom.
THE HYDROLYSIS OF P-NITROPHENYL ACETATE BY A MICELLAR BIFUNCTIONAL CATALYST
Authors: Kunitake Toyoki , Okahata Yoshio , Sakamoto Tetsuo 
Published: July 2006

Abstract
A surfactant molecule which contains the hydroxamic acid and imidazole groups was synthesized and its catalytic efficiency in the hydrolysis of p-nitrophenyl acetate was examined in a mixed micelle with CTAB. The presence of the complementary functions in cationic micelles led to much enhanced catalytic efficiency compared with micellar, monofunctional systems.
A NOVEL RING CLEAVAGE OF 2,4,6-CYCLOOCTATRIEN-1-ONE
Authors: Ogawa Masashi , Matsuda Tsutomu 
Published: July 2006

Abstract
Piperidine reacts with 2,4,6-cyclooctatrien-1-one(1) to give 8-piperidino-3,5,7-octatrien-2-one and acetophenone. When pyrrolidine and morpholine were used the corresponding 8-amino ketones were produced. Deuterium insertion study of 1 with N-deuteriopiperidine suggests that in DMSO the ring cleavage proceeds by initial addition of piperidine at the C(7) and C(2) carbons (2,7-addition) followed by subsequent fission of C(7)–C(8) bond of 1.
ON THE PROPERTY OF DIBENZO[d,j]-6,8-BISDEHYDRO[13]ANNULENONE
Authors: Ojima Juro , Yokoyama Yoji , Yokoyama Tai 
Published: July 2006

Abstract
An annelated[13]annulenone (3) and its precursor (1) were converted into the corresponding alcohols (4) and (2), respectively. Comparison of the NMR spectrum of the alcohol (2) with that of (4) suggested that (3) is weakly paratropic.
A NOVEL TYPE OF POLYMER-EFFECT DUE TO A RIGID ROD-SHAPED CHAIN. THERMAL DEPOLYMERIZATION BEHAVIOR OF POLY-2,5-DISTYRYLPYRAZINE
Authors: Hasegawa Masaki , Nakanishi Hachiro , Yurugi Tadashi 
Published: July 2006

Abstract
A novel type of polymer-effect due to a rigid rod-shaped chain, was observed. On the thermal depolymerization of poly-2,5-distyrylpyrazine at 290°C, a high molecular weight polymer crystal is much less stable than the same of low molecular weight. This is the first example of chemical reaction that the breakage of chemical bond is dependent on the molecular length.
13C-NMR SPECTRA AND BONDING SITUATION IN KETENIMINES
Authors: Firl Joachim , Runge Wolfgang , Hartmann Werner , Utikal Hans-Peter 
Published: July 2006

Abstract
13C-NMR spectra of a series of substituted ketenimines are reported. The terminal carbon resonances are found at unusual high fields between δ 37 and 78, while the central carbon signals appear around δ 189–196. On the basis of these results, the bonding situation in ketenimines has been discussed.
27Al–13C SPIN COUPLING CONSTANT IN LITHIUM TETRAMETHYLALUMINATE
Authors: Yamamoto Osamu 
Published: July 2006

Abstract
27Al–13C and 13C–1H spin coupling constants in LiAl(CH3)4 were obtained from the 13C NMR spectra, and found to be 71.5±0.5 Hz and 106.5±1.0 Hz, respectively. A brief discussion was made on the coupling constants obtained.
BROMINE ABSTRACTION BY ARYL RADICALS FROM SUBSTITUTED BENZYL BROMIDES
Authors: Migita Toshihiko , Nagai Tomoko , Abe Yoichi 
Published: July 2006

Abstract
The relative reactivities of substituted benzyl bromides toward bromine abstraction by substituted phenyl radicals were determined at 60°C. The nature and the extent of polar and conjugative effects were found to depend on the substituents on the radicals.
SYNTHESIS OF ERIOSTOIC ACID AND ERIOSTEMOIC ACID
Authors: Nakayama Mitsuru , Hayashi Shûichi , Tsukayama Masao , Horie Tokunaru , Masumura Mitsuo 
Published: July 2006

Abstract
A linear-type carboxyethyl pyronochromanone derivative (V), after being converted into methyl ester-methyl ether (VI), was reduced with sodium borohydride to give methyl eriostate (VII). Hydrolysis of the ester (VII) with alkari afforded eriostoic acid (I). Eriostemoic acid (II) was also synthesized from an angular-type pyronochromanone derivative (IV) in a similar manner.
SUBSTITUENT EFFECT ON RIBONUCLEASE T1-CATALYZED TRANSPHOSPHORYLATION OF para-SUBSTITUTED BENZYL ESTERS OF GUANOSINE 3′-PHOSPHATE
Authors: Satoh Kimihiko , Inoue Yasuo 
Published: July 2006

Abstract
The maximal velocities have been measured for the ribonuclease T1- catalyzed transphosphorylation of a series of substrates named in the title. Based on the present results together with other relevant data, it is concluded that the catalysis involves nucleophilic component as well as electrophilic character, and the breakdown of a pentacovalent intermediate is not rate-limiting. We have proposed a possible mechanism most pertinent to a description of the ribonuclease T1 action.
ESR LINE-SHAPE EFFECTS IN THE PRESENCE OF SECOND-ORDER SPLITTINGS OBSERVED FOR 4,4′-DIFLUOROBIPHENYL CATION
Authors: Nemoto Fujito , Shimoda Fumio , Ishizu Kazuhiko 
Published: July 2006

Abstract
ESR spectra of 4,4′-difluorobiphenyl cation in solution show resolved second-order splittings and marked line-broadening attributable to the modulation of tumbling motion of the 19F anisotropic hyperfine interactions. This dipolar broadening is mainly observed for the line associated with the triplet state of the two equivalent 19F nuclei and at −90°C, only the singlet line is readily detectable.
THE REACTION OF ENOL ETHERS WITH ALDEHYDES PROMOTED BY TITANIUM TETRAISOPROPOXIDE AND TITANIUM TETRACHLORIDE
Authors: Kitazawa Eiichi , Imamura Tetsuo , Saigo Kazuhiko , Mukaiyama Teruaki 
Published: July 2006

Abstract
The equimolar reactions of enol ethers with various aldehydes in the coexistence of Ti(OPr-i)4 and TiCl4 afford 3-isopropoxy acetals or α,β -unsaturated carbonyl compounds in good yields under mild conditions.
SYNTHESIS OF EVONINE FROM EVONINIC ACID AND AN EVONINOL DERIVATIVE
Authors: Sugiura Kimio , Yamada Kiyoyuki , Hirata Yoshimasa 
Published: July 2006

Abstract
The 14-membered bislactone ring was constructed starting from dimethyl evoninate (1) and the evoninol derivative (6), leading to the synthesis of evonine (13).
FLUORESCENCE QUENCHING PROCESSES OF CARBAZOLE-AMINE SYSTEMS AS REVEALED BY LASER PHOTOLYSIS METHOD
Authors: Masuhara Hiroshi , Tohgo Yuichi , Mataga Noboru 
Published: July 2006

Abstract
The fluorescence quenching mechanisms of carbazole in acetonitrile were studied in detail by the laser photolysis method. Proton transfer and hydrogen atom transfer in the excited state were observed in the case of the triethylamine quencher, while ionic photodissociation due to electron transfer was confirmed in the case of the N,N-dimethylaniline quencher. However, no transient was detected in the case of the quenching by pyridine.
THE ELECTRON TRANSFER REACTION BETWEEN WURSTER’S BLUE CATION AND N,N-DIMETHYL-P-PHENYLENEDIAMINE IN AQUEOUS SOLUTION
Authors: Yamagishi Akihiko 
Published: July 2006

Abstract
The electron transfer reaction between Wurster’s Blue cation (TMPD\underset.+) and N,N-dimethyl-p-phenylenediamine (DMPD) in aqueous solution is investigated by the temperature-jump method. The forward and backward rate constants of TMPD\underset.+ + DKPD \ightleftharpoons TMPD + DMPD\underset.+ are determined to be (4.2±2)×106 and (1.5±0.5)×108 M−1 s−1 at 10±2°C, respectively.
ELECTROCHEMICAL OXIDATION OF LITHIUM ESTER ENOLATES
Authors: Tokuda Masao , Shigei Tetsuro , Itoh Mitsuomi 
Published: July 2006

Abstract
Electrochemical oxidation of lithium enolates of esters containing no activating groups at low temperature produced the corresponding substituted succinate esters in fairly good yields Electrolysis of enolate of ethyl phenylacetate also produced a quantitative yield of the oxidative dimer with 100% current efficiency.
A NEW SYNTHESIS AND THERMAL REARRANGEMENT OF 3,4-BENZOBICYCLO[4.2.0]OCTA-3,7-DIENE-2,5-DIONE
Authors: Oda Masaji , Miyazaki Hideo , Kayama Yasutaka , Kitahara Yoshio 
Published: July 2006

Abstract
Title compound (3) was prepared by a new method from bicyclo[4.2.0]octa-3,7-diene-2,5-dione through Diels-Alder reaction with butadiene, bromination with NBS, and then dehydrobromination with triethylamine. Thermolysis of (3) at 500°C gave, unexpectedly, 5-hydroxyacenaphthenone by a novel rearrangement. The intermediacy of 2,3-benzocyclooctatriene-1,4-dione is proposed.
SPACE-CHARGE-LIMITED CURRENTS IN POLY-N-VINYLCARBAZOLE FILMS
Authors: Kato Keishi , Fujimoto Tadaaki , Kodera Hideaki , Mikawa Hiroshi 
Published: July 2006

Abstract
The space-charge-limited currents in poly-N-vinylcarbazole films were investigated with the use of electrolytic solutions such as Ag2+ in 7.5N HNO3, NaI solution saturated with iodine, and Ce4+ in 15N H2SO4. These oxidizing solutions are suitable hole-injecting electrodes. The current-voltage characteristic indicates the existence of exponentially-distributed traps, the concentration of which is about 5×1018cm−3.
THE OXIDATION OF ALCOHOLS TO CARBONYL COMPOUNDS VIA ALKOXYMAGNESIUM BROMIDES
Authors: Mukaiyama Teruaki , Tsunoda Masaru , Saigo Kazuhiko 
Published: July 2006

Abstract
Alkoxymagnesium bromides prepared from alcohols and ethylmagnesium bromide are oxidized with N-chlorosuccinimide in the presence of lithium tert-butoxide to afford the corresponding carbonyl compounds in good yields.
MOLECULAR CONFORMATIONS AND C–Cl STRETCHING VIBRATIONS OF 1-CHLORO-2-METHYLPROPANE AND C–S STRETCHING VIBRATIONS OF 2-METHYL-1-PROPANETHIOL AND l-CYSTEINE
Authors: Ozaki Yukihiro , Sugeta Hiromu , Miyazawa Tatsuo 
Published: July 2006

Abstract
The Raman spectra of 1-chloro-2-methylpropane and 2-methyl-1-propanethiol were measured in the liquid and solid states. Conformations of these molecules were studied in relation with the characteristic CH2–Cl and CH2–S stretching vibrations. The molecular structure of l-cysteine was discussed on the basis of observed CH2–S stretching frequencies.
THE USE OF VINYLENE HOMOLOG OF MIXED ANHYDRIDE FOR THE CARBOXYL-ACTIVATION. A NEW SYNTHESIS OF PEPTIDES
Authors: Saito Tomoo 
Published: July 2006

Abstract
Several dimedone enol esters of N-benzyloxycarbonylamino acids have been prepared in excellent yields. It has also been indicated that the esters accounted as a vinylene homolog of mixed anhydride were easily aminolyzed by free amino esters or amino acids to give the corresponding dipeptides.
THE SYNTHESIS OF 6-METHYLEN-2(6H)-AZULENONE (2,6-AZULENOQUINONE 6-METHIDE) DERIVATIVES
Authors: Kosuge Shunji , Morita Tadayoshi , Takase Kahei 
Published: July 2006

Abstract
6-Methylen-2(6H)-azulenone (2,6-azulenoquinone 6-methide) derivatives (3a,b) were synthesized and shown to be so reactive that they could be isolated only in a form of dimers (4a,b).
SOME REPRESENTATIVE CYCLOADDITIONS OF VINYLCYCLOPROPANE. AN EVIDENCE FOR THE TWO-STEP PROCESS IN THE DONOR-ACCEPTOR TYPE CYCLOADDITION
Authors: Shimizu Nobujiro , Ishizuka Shin-ichi , Tsuji Takashi , Nishida Shinya 
Published: July 2006

Abstract
Reaction of 1,1-diphenyl-2-vinylcyclopropane with 2,3,4,5-tetrachlorocyclopentadienone ethylene ketal proceeded smoothly to give a diene adduct quantitatively, whereas its reaction with tetracyanoethylene gave unexpected adducts after rearrangements. These results evidence that the latter donor-acceptor type cycloaddition proceeds via a zwitterionic intermediate.
CYCLOADDITIONS DE NITRONES ET D’UNE NITRILIMINE SUR LA DIPHENYLCYCLOPROPENONE
Authors: Matsukubo Hiroshi , Kato Hiroshi 
Published: July 2006

Abstract
The reaction of diphenylcyclopropenone (1) with C-aryl-N-phenylnitrone gave 2-anilino-5-aryl-2,4-diphenyl-3(2H)-furanone (3) accompanied by an oxygenated by-product. The reaction of (1) with diphenylnitrilimine afforded mesoionic tetraphenylpyridazin-4-one (8).
HYDROTHERMAL GROWTH OF ANATASE (TiO2) CRYSTALS
Authors: Izumi Fujio , Fujiki Yoshinori 
Published: July 2006

Abstract
Anatase crystals were grown hydrothermally using KF–K2HPO4 solutions. Only rutile was formed in KF solution, whereas the addition of K2HPO4 was effective in crystallizing anatase over a wide range of temperature and pressure. Some properties and the morphological features of the synthetic anatase are described.
AN EVIDENCE FOR SINGLET GROUND STATE OF 1,6-DI-t-BUTYL-3,4,8,9-TETRAPHENYLTRICYCLO[6.2.0.02,5]DECA-1,3,5,7,9-PENTAENE
Authors: Toda Fumio , Mukai Kazuo 
Published: July 2006

Abstract
Ground state of the title compound (1) was shown to be singlet by means of its ESR spectrum and magnetic susceptibility.
RAMAN SPECTRUM OF TEREPHTHAL-BIS-BUTYLANILINE IN THE LIQUID CRYSTALLINE STATES
Authors: Takase Akira , Akagami Sakumitsu , Nakamizo Minoru 
Published: July 2006

Abstract
Raman spectra of the smectic H phase and two unidentified phases of terephthal-bis-butylaniline are studied in the 0–400cm−1 region. Observation of the Raman peaks due to lattice vibrations suggests that the latter two phases are closer to the crystalline solid phase rather than the smectic H phase.
SYNTHESIS AND PROPERTIES OF THE METALLIC MOLYBDATE(IV) CaMoO3
Authors: Kamata Kiichiro , Nakamura Tetsuro , Sata Toshiyuki 
Published: July 2006

Abstract
Polycrystalline CaMoO3 was prepared by a new method making use of the oxygen stability range, and revealed to have an orthorhombic lattice (a=5.448Å, b=7.776Å, c=5.582Å), metallic conduction and Pauli paramagnetism. The results indicate that 4d2 electrons of Mo4+ are delocalized in CaMoO3 as same as those in BaMoO3 and SrMoO3.
A FACILE SYNTHESIS OF UNSYMMETRICAL DISULFIDES
Authors: Endo Tadashi , Tasai Hidetoshi , Ishigami Tatsuzo 
Published: July 2006

Abstract
Unsymmetrical disulfides were readily prepared in high yields by successive treatment of silver thiolates initially with 2,4-dinitrobenzenesulfenyl chloride in acetonitrile at 0 °C and then with the second thiols and silver acetate in DMF at room temperature.
A NOVEL POLYMER–RHODIUM COMPLEX AS HYDROGENATION CATALYST OF ALKENES
Authors: Nakamura Yoshio , Hirai Hidefumi 
Published: July 2006

Abstract
A polymer–rhodium complex prepared from rhodium(III) chloride and styrene-divinylbenzene copolymer with iminodiacetic acid groups is found to catalyze the heterogeneous hydrogenation of alkenes in polar solvents at 30°C under an atmospheric hydrogen pressure. The polymer complex hydrogenates selectively the ethylenic double bonds in the alkenes with carbonyl and aromatic groups. The rates of hydrogenation of alkenes by the polymer complex are found to be markedly affected by the steric hindrance of the substrates.
HETEROGENEOUS TRIPLET-TRIPLET ANNIHILATION IN POLY-N-VINYLCARBAZOLE FILMS DOPED WITH NAPHTHALENE AND FLUORENE
Authors: Itaya Akira , Okamoto Ken-ichi , Kusabayashi Shigekazu 
Published: July 2006

Abstract
The triplet energy transfer in poly-N-vinylcarbazole (PVCz) films has been investigated by measuring the delayed emission spectra at 77 K. By doping of a triplet quencher such as naphthalene and fluorene, the PVCz phosphorescence decreased significantly and was replaced by the sensitized dopant phosphorescence. On the contrary, the PVCz delayed fluorescence rather increased with increasing concentration of triplet quenchers. This phenomenon suggests the presence of a heterogeneous triplet–triplet annihilation in PVCz films.
NOVEL ISOMERIZATION AND RETRO-MANNICH REACTION OF 1,1,2,2-TETRAACYLCYCLOPROPANES
Authors: Ohkata Katsuo , Kubo Yasuo , Tamaru Akira , Hanafusa Terukiyo 
Published: July 2006

Abstract
1,1,2,2-Tetraacylcyclopropanes (1a, 1b) were rearranged into nine-membered enol lactones (2a, 2b) by tertiary amines, while primary arylamines brought about retro-Mannich reaction to give bisdimedone (4) and Schiff base.
NOVEL CAGE-SHAPED COMPOUNDS FROM REDUCTION OF r-2,3-EPOXY-2,3,4,c-4a,5,8,c-8a-HEXAHYDRO-c-5,8-ISOBUTYLIDENE-1,4-NAPHTHOQUINONES
Authors: Ichihara Akitami , Kaibuchi Hideo , Kobayashi Makio , Oda Kengo , Sakamura Sadao , Furusaki Akio , Matsumoto Takeshi 
Published: July 2006

Abstract
Novel cage-shaped compounds were obtained by the reduction of r-2,3-epoxy-2,3,4,c-4a,5,8,c-8a-hexahydro-c-5,8-isobutylidene-1,4-naphthoquinones (1) and assigned the structure 2 on the basis of the spectral data and X-ray crystallography. The compounds have an oxygen-containing strained cage structure hitherto unknown.
CORRELATIONS BETWEEN LONG-RANGE COUPLINGS IN ELECTRON SPIN RESONANCE AND NUCLEAR MAGNETIC RESONANCE
Authors: Kawamura Takashi , Matsunaga Masaji , Yonezawa Teijiro 
Published: July 2006

Abstract
Correlations between coupling constants in electron spin resonance and nuclear magnetic resonance are examined. Plots of proton hyper-fine splitting constants of HR· against the corresponding proton–proton coupling constants of the parent hydrocarbons HRH are shown to fit one curve.