bluuebunny/crossref_metadata_2025_split huggingface dataset:
HIGHLY STABLE TAUTOMERS OF β-KETOESTER: CONFORMATIONS OF 9-OXO-8,9,10,11-TETRAHYDRO- AND 9-HYDROXY-10,11-DIHYDRO-7H-CYCLOOCTA-[de]NAPHTHALENE-8-CARBOXYLIC ESTERS
Authors: Kamada Toshihiro , Yamamoto Osamu 
Published: July 2006

Abstract
Tautomers of the titled β-ketoester, both keto (1) and enol (2), are obtained, which are unusually stable in the solid state as well as in solution. NMR studies revealed that 1 exists as an equi-librium mixture of axial-boat (ab) and equatorial-boat (eb) conformers in solution, whereas 2 exists in only one conformation.
FORMATION OF ALUMINUM PHOSPHATES AT LOW TEMPERATURES
Authors: Tsuhako Mitsutomo , Matsuo Tsuneo , Motooka Itaru , Kobayashi Masamitsu 
Published: July 2006

Abstract
In the Al(OH)3–H3PO4 system, AlH3(PO4)2·3H2O was formed at 50–70°C, AlH3(PO4)2·H2O at 70–110°C and the C type of Al(H2PO4)3 at 120–190°C. On the other hand, in the α-Al2O3–H3PO4 system no crystalline aluminum phosphate could be obtained even at 200°C.
THE TEMPERATURE DEPENDENCE OF HYDROGENOLYTIC ASYMMETRIC TRANSAMINATION BETWEEN ESTERS OF OPTICALLY ACTIVE PHENYLGLYCINE AND PYRUVIC ACID
Authors: Harada Kaoru , Kataoka Yoshiharu 
Published: July 2006

Abstract
Asymmetric synthesis of alanine by hydrogenolytic asymmetric transamination between ethyl (R)-α-phenylglycinate and ethyl pyruvate was studied. Clear temperature dependence in the asymmetric synthesis was observed and the configuration of alanine was inverted depending on the reaction temperature used. The results are explained by the chelation hypothesis based on the substrate–catalyst complex.
THE (V5+=O) BOND RESPONSIBLE FOR THE ACCELERATION OF THE NO–NH3 REACTION ON VANADIUM OXIDE IN DILUTE GAS CONDITION
Authors: Inomata Makoto , Miyamoto Akira , Murakami Yuichi 
Published: July 2006

Abstract
The NO–NH3 reaction was markedly accelerated by the addition of O2 up to 1%. It was found that the (V5+=O) bond on the surface of vanadium oxide plays as active site for the reduction of NO by NH3 and the reaction is accelerated in proportion to the amount of the (V5+=O) bond.
REGIO- AND STEREOSELECTIVE CYCLOPROPANE RING OPENING IN A TETRACYCLIC COMPOUND. exo-4-ACETOXY-4-HOMOISOTWISTANE (exo-4-ACETOXYTRICYCLO[5.3.1.03,8]UNDECANE) FROM 2,4-DEHYDRO-4-HOMOTWISTANE (TETRACYCLO[ 5.4.0.02,4.03,9]UNDECANE) IN ACETIC ACID UNDER SULFURIC ACID CATALYSIS
Authors: Takaishi Naotake , Fujikura Yoshiaki , Inamoto Yoshiaki 
Published: July 2006

Abstract
Sulfuric acid catalyzed reaction of 2,4-dehydro-4-homotwistane (1) with acetic acid gave predominantly exo-4-acetoxy-4-homoisotwistane (2). The result is best interpreted in terms of the edge-protonated cyclopropane intermediate 1-H+ , in which the ring opening occurs to give the most stable skeletal structure 8, while the regio- and stereoselectivity arise from the attack of AcOH at the least congested exo-4 site.
IR SPECTRA OF THE REACTION PRODUCTS BETWEEN IRON VAPOR AND NITRIC OXIDE: A MODEL FOR THE CHEMISORPTION OF NITRIC OXIDE
Authors: Bandow Hiroshi , Onishi Takaharu , Tamaru Kenzi 
Published: July 2006

Abstract
Based on the IR spectroscopic study of the reaction products between iron vapor and nitric oxide, which can be regarded as a model of chemisorbed species, the IR absorption bands of nitric oxide adsorbed on iron at 1800 and 1720 cm−1 are attributed to adsorbed species on oxidized and metallic iron, respectively
A NOVEL METHOXYLATION OF ALLYLIC ALCOHOLS VIA ALLYLIC REARRANGEMENT USING DICHLOROBIS(TRIPHENYLPHOSPHINE)PLATINUM(II)-TIN(II)CHLORIDE DIHYDRATE COMPLEX CATALYST
Authors: Ichinohe Yoshiyuki , Sakamaki Hiroshi , Kameda Noriyuki 
Published: July 2006

Abstract
Several allylic steroidal alcohols give rearranged allyl methyl ethers by dichlorobis(triphenylphosphine)platinum(II)–tin(II)chloride dihydrate complex catalyst in methanol.
ISOMERIZATION AND DEHYDROGENATION OF CYCLOHEXENE OVER TaS2AND TRANSITION METAL INTERCALATED TaS2
Authors: Saito Yoshiaki , Yamazoe Noboru , Seiyama Tetsuro 
Published: July 2006

Abstract
Over TaS2 and M1⁄3TaS2 (M = Ni, Fe, and Co), cyclohexene undergoes dehydrogenation to benzene and isomerization to 1-methylcyclopentene selectively in nitrogen and hydrogen atmosphere, respectively. Considerable promoting effects on catalytic activity are exerted by the intercalation of Ni and Fe. Moreover, metal intercalation has an effect to prolong a catalyst life.
RESONANCE RAMAN SPECTRA OF [Pt(tn)2] [PtBr2(tn)2]X4(tn = trimethylenediamine, X = CIO4 and BF4)
Authors: Ohta Nobuhiro , Kozuka Muneteru , Nakamoto Kazuo , Yamashita Masahiro , Kida Sigeo 
Published: July 2006

Abstract
Resonance Raman spectra of [Pt(tn)2][PtBr2(tn)2]X4 were measured with the excitation lines, 457.9, 488.0, 514.5, 530.9, 568.2, 647.1 and 676.4 nm. The symmetric Br–Pt–Br stretching (ν1) vibration was strongly enhanced in this region. The excitation profiles of ν1, and its overtones roughly follow the band contour of its electronic absorption. This is a marked contrast to that of Reihlen’s Green, where the excitation profiles of the same vibrations were remarkably different from its electronic spectrum.
PREPARATION OF [Co(TeO6H4)(en)2]+ AND ITS CONDENSED COMPLEXES
Authors: Hosokawa Yutaka , Shimura Yoichi 
Published: July 2006

Abstract
Three new complexes, [Co(TeO6H4)(en)2]+,[Co(en)2(Te2O10H4)Co(en)2]2+, and [{Co(en)2}2(Te2O10){Co(en)2}2]4+ , have been isolated as their chlorides from the reaction solutions of cis-[CoCl2(en)2]+ and Te(OH)6, and their optical resolutions have been achieved.
PHOTO-INDUCED SOLVENT-INCORPORATED ADDITION OF N-METHYLPHTHALIMIDE TO OLEFINS. REACTIONS PROMOTED BY WAY OF INITIAL ONE ELECTRON TRANSFER
Authors: Maruyama Kazuhiro , Kubo Yasuo 
Published: July 2006

Abstract
Irradiation of N-methylphthaiimide 1 and styrene 2b in methanol gave two solvent-incorporated isomeric adducts 4a and 5a. The corresponding solvent-incorporated adducts (1 : olefin : alcohol = 1:1:1) were obtained in the photochemical reaction of 1 with several olefins 2a–f in alcohols. A mechanism involving one electron transfer from 2b to 1 is proposed.
PREPARATION OF TIN-DOPED INDIUM OXIDE THIN FILMS BY THERMAL DECOMPOSITION OF METAL OCTANOATES
Authors: Tsunashima Atsumu , Asai Toshinobu , Kodaira Kohei , Matsushita Toru 
Published: July 2006

Abstract
Tin-doped indium oxide thin films have been prepared by thermal decomposition of metal octanoates at 400–600°C. Typical films are 2000–5000 Å thick with a sheet resistance of 350–850 ohm/square and a specific resistivity of 1.7×10−2 ohm-cm, and with a light transmission of more than 90 %.
ADDUCTS OF BIS(O,O′-DIETHYL DITHIOPHOSPHATO)COBALT(II) WITH SOME AMINES AND TRIPHENYLPHOSPHINE
Authors: Yamada Yukio , Shimoi Mamoru , Ouchi Akira 
Published: July 2006

Abstract
The 1:1 triphenylphosphine, hexamine, piperazine, pyrazine, and benzothiazole adducts, as well as the 2:1 benzothiazole and benzimidazole adducts of bis(O,O′-diethyl dithiophosphato)cobalt(II) were obtained as crystalline solids, which were hardly oxidized in air, but partially dissociated in their solutions.
SYNTHESIS AND CONFORMATION OF 1,2,4-TRI-O-ACTYL-5,6-DIDOXY-3-O-METHYL-5-C-[(S)-PHENYLPHOSPHINYL]-β-d-GLUCOPYRANOSE
Authors: Yamashita Mitsuji , Nakatsukasa Yasuhiko , Inokawa Saburo , Hirotsu Ken , Clardy Jon 
Published: July 2006

Abstract
Hydrolysis of phenylphosphinyl derivative of hexofuranose (1) followed by acetylation gave two compounds. The X-ray analysis of one component revealed the structure to be 1,2,4-tri-O-acetyl-5,6-dideoxy-3-O-methyl-5-C-[(S)-phenylphosphinyl]-β-d-glucopyranose (3a) which had a 4C1 (d) conformation.
DEPENDENCY OF THE RATIO OF THE DIASTEREOMERS, l- AND d-t-LEUCYL-l-VALINE, ON THE COUPLING METHODS
Authors: Miyazawa Toshifumi , Takashima Katsumi , Yamada Takashi , Kuwata Shigeru , Watanabe Hiroshi 
Published: July 2006

Abstract
In the condensation of N-pivaloyl- or N-benzyloxycarbonyl-Dl-t-leucine with methyl l-valinate, the ratio of the resulting diastereomers varied depending upon the coupling method.
SYNTHESIS OF PISCERYTHRONE
Authors: Nakayama Mitsuru , Hayashi Shûichi , Tsukayama Masao , Horie Tokunaru , Masumura Mitsuo 
Published: July 2006

Abstract
5,7,2′,4′-Tetrahydroxy-5’-methoxyisoflavone (6) prepared from 2,4,2′,4′-tetrabenzyloxy-6’-hydroxy-5-methoxychalcone (2) by way of three steps was partially benzoylated to give 7-benzoyloxy-5,2′,4′-trihydroxy-5′-methoxychalcone (7). The condensation of 7 with 2-methyl-3-buten-2-ol afforded 7-benzoyloxy-5,2′,4′-trihydroxy-5′-methoxy-3′-(3-methyl-2-butenyl) isoflavone (8), which was hydrolyzed to give piscerythrone (1).
A USEFUL METHOD FOR THE SYNTHESIS OF MACROCYCLIC LACTONE
Authors: Narasaka Koichi , Maruyama Kazuo , Mukaiyama Teruaki 
Published: July 2006

Abstract
Long chain hydroxy acids were converted into macrocyclic lactones in high yields by the treatment with 2-chloro-6-methyl-1,3-diphenylpyridinium tetrafluoroborate, 2,6-dimethylpyridine (or 2,4,6-triphenylpyridine) and benzyltriethylammonium chloride. The lactonization reaction was successfully applied to the synthesis of (R) - (+)-ricinelaidic acid lactone, and prostaglandin F2α 1,9- and 1,15-lactones.
THE EFFECT OF PYRIDINE ON THE HYDROGEN ABSORPTION PROCESS OF BIS(DIMETHYLGLYOXIMATO)COBALT(II)
Authors: Yamaguchi Tatsuaki , Miyagawa Ryuji 
Published: July 2006

Abstract
The initial hydrogen absorption rate of the methanolic solution of isolated pyridinecobaloxime was measured manometrically at 30°C. The rate dependence on the cobaloxime concentration was varied with excess pyridine added to the solution. The results gave the mechanistic elucidation for the hydrogen absorption process.
THE REVISED STRUCTURE OF DISPERMOL AND TOTAL SYNTHESIS OF (−)-DISPERMONE, (+)-DISPERMOL, AND (+)-MAYTENOQUINONE
Authors: Matsumoto Takashi , Usui Shuji 
Published: July 2006

Abstract
The total syntheses of natural tricyclic diterpenes, (−)-dispermone (1), (+)-dispermol (5), and (+)-maytenoquinone (3), were successfully achieved starting from (R)-(−)-α-cyclocitral (6) and the proposed structure (2) for dispermol was revised to 12-hydroxy-13-methoxytotara-8,11,13-triene (5).
CATALYTIC ASYMMETRIC HYDROGENATIONS WITH POLYMER SUPPORTED CHIRAL PYRROLIDINEPHOSPHINE–RHODIUM COMPLEXES
Authors: Achiwa Kazuo 
Published: July 2006

Abstract
The syntheses of new polymer supported chiral pyrrolidinephosphine–rhodium catalysts; 4VB-PPM-HEMA-Rh+ (6a) and 4VB-PPM-HEMA-Rh (6b) and their application to the asymmetric hydrogenation of some olefins were described. Thus, 4VB-PPM-HEMA-Rh+ in the presence of triethylamine gave (S)-α-methylsuccinic acid and (R)-N-acetylphenylalanine in 82.3 and 70.0% optical yields respectively.
CYCLIC SULFATE FORMATION FROM EPOXIDES
Authors: Nishinaga Akira , Wakabayashi Shigenori 
Published: July 2006

Abstract
The reactions of 2,4,6-tri-tert-buty1-4,5-epoxy-6-hydroxy-2-cyclohexenone and 2,4,6-tri-tert-butyl-2,3,4,5-diepoxy-6-hydroxycyclohexanone with sulfuric acid in acetic anhydride led to opening of the epoxy ring at 4-position to give the corresponding 4,5-sulfonyldioxy derivatives (cyclic sulfates).
REACTION PRODUCTS OF FUNCTIONALLY SUBSTITUTED 2-CHLOROPROPANES WITH BENZENE CATALYZED BY ALUMINUM CHLORIDE
Authors: Matsuda Haruo , Shinohara Hideo 
Published: July 2006

Abstract
Reactions of 1-X-2-chloropropanes (X=CH3O–, HO– and CH3OCO–) with benzene catalyzed by AlCl3 have been studied. The former two secondary chlorides gave unusual products, n-propylbenzene and 1,1-diphenyl-1-propene, in addition to 1-X-2-phenylpropane, 1,1- and 1,2-diphenylpropanes, respectively, whereas the other one afforded only methyl 3-phenylbutanoate.
A STABLE PYRIDINESULFENYL HALIDE
Authors: Matsueda Rei , Aiba Kimie 
Published: July 2006

Abstract
Synthesis of 3-nitro-2-pyridinesulfenyl halide (NPySX) is reported. NPySX was found to be extraordinarily stable as compared with known pyridinesulfenyl halides and contribution of the nitro group to its stabilization was indicated by X-ray diffraction investigation of one of its derivatives.
PHOTOREACTION OF 1,5-DIMETHYL-6-OXACYCLOPROPYLIDENETRICYCLO[3.2.1.02,7]OCT-3-EN-8-ONE: A NOVEL TYPE OF ADDITION OF KETENE WITH THE MOIETY CONTAINING AN EPOXIDE RING
Authors: Nitta Makoto , Nakatani Hazime 
Published: July 2006

Abstract
1,5-Dimethyl-6-oxacyclopropylidenetricyclo[3.2.1.02,7] oct-3-en-8-one (II), upon irradiation, afforded 4,8-dimethyl-1,4-dihydrobenzopyran-3-one (III). This rearrangement was considered to be a novel ene-type reaction of photochemically generated ketene with the moiety involving an epoxide ring. The ketene intermediate was detected by low temperature ir spectrum as well.
STEREOCHEMISTRY OF PHOTOCYCLOADDITION PRODUCTS OF ACENAPHTHYLENE WITH ACRYLONITRILE AND METHYL ACRYLATE
Authors: Nakamura Yushin , Imakura Yasuhiro , Morita Yutaka 
Published: July 2006

Abstract
Stereochemistry of photocycloaddition products of acenaphthylene with acrylonitrile and methyl acrylate were decided by the chemical transformations and the NMR spectral correlation with those of their derivatives, viz., equilibriation of the deuterated isomers of acrylonitrile-adduct with t-BuOK/BuOD, reduction to amine with LiAlH4, acetylation of amine, and hydrolysis followed by methylation of acrylonitrile-adduct to methyl acrylate adduct.
LIMONOIDS FROM MELIA AZEDARACH LINN. VAR. JAPONICA MAKINO. II. THE NATURAL HYDROXYL PRECURSOR OF SENDANIN
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Ishida Hiroaki , Tokoroyama Takashi 
Published: July 2006

Abstract
Because sendanin is an artifact which has been isolated from M. azedarach Linn. var. japonica Makino only after the acetylation of crude limonoid fraction, the structure of the natural hydroxyl precursor was studied. The chemical and spectroscopic evidence revealed that it was an epimeric mixture of the hemiacetal 5.
CONFORMATIONAL CHANGE OF PHOTORESPONSIVE CAPPED CYCLODEXTRIN DETECTED BY CIRCULAR DICHROISM
Authors: Ueno Akihiko , Saka Rumiko , Osa Tetsuo 
Published: July 2006

Abstract
The circular dichroism spectrum of azobenzene-capped β-cyclodextrin (I) was found, in some cases, to show an abrupt change on addition of guest molecules with ionic nature. This nonstoichiometric behavior was regarded as evidence for a conformational transition of the cyclodextrin moiety caused by outside binding of the guest molecules.
A SIMPLE SYNTHESIS OF (+)-11-DEOXY-11α-HYDROXYMETHYL PGF1α AND ITS 12-ISOMER FROM AUCUBIN
Authors: Ohno Kiyotaka , Naruto Masanobu 
Published: July 2006

Abstract
A simple synthesis of the titled prostanoids, (+)-11-deoxy-11α-hydroxymethyl PGF1α 9 and its 12-isomer 6, from aucubin 1 is described. The latter prostanoid 6 is characterized by its all-cis configuration on the cyclopentanering.
ASYMMETRIC SYNTHESIS OF TWO ENANTIOMERS OF FRONTALIN
Authors: Sakito Yoji , Mukaiyama Teruaki 
Published: July 2006

Abstract
(S)-Frontalin and its antipode were separately synthesized in good yields from (S)- and (R)-2-hydroxy-2,6-dimethyl-6-heptenal, which were prepared in high optical yields by an asymmetric synthesis using (S)- 2-(anilinomethyl)pyrrolidine as a chiral auxiliary.
SYNTHESES AND PROPERTIES OF TRIMETHYLBISDEHYDRO[15]ANNULENONE AND ITS BENZANNELATED DERIVATIVES
Authors: Ojima Juro , Wada Kazuyo , Kanazawa Keiko 
Published: July 2006

Abstract
Syntheses of 5,10,15-trimethyl- 6,10,15-dimethylbenzo[d]-6,8-bisdehydro[15]annulenone 7,2,12-dimethylbenzo[f]-8,10-bisdehydro[15]annulenone 8, and 15-methyldibenzo[d,j]-6,8-bisdehydro[15]annulenone 9 are described. As observed for the corresponding[17]annulenone, the 1H-NMR spectra of these annulenones suggest that the skeleton of the bisdehydro[15]annulenone of this type is more planar and less strained than that of [13]annulenone.
A NEW AND CONVENIENT SYNTHESIS OF TRISUBSTITUTED α,β-UNSATURATED CARBOXYLIC ESTERS
Authors: Tanaka Kazuhiko , Uneme Hideki , Ono Noboru , Kaji Aritsune 
Published: July 2006

Abstract
A new and single-step method for the synthesis of trisubstituted α,β-unsaturated esters using the lithium enolates of S-1-ethoxycarbonylethyl diethyl phosphorothioate (Ib) and S-1-ethoxycarbonylbutyl diethyl phosphorothioate (Ic) has been developed.
A FACILE METHOD FOR THE PREPARATION OF OPTICALLY PURE 2,4-PENTANEDIOL; AN APPLICATION OF ASYMMETRICALLY MODIFIED NICKEL CATALYST FOR THE PREPARATION OF OPTICALLY ACTIVE COMPOUNDS
Authors: Ito Kazuhisa , Harada Tadao , Tai Akira , Izumi Yoshiharu 
Published: July 2006

Abstract
The hydrogenation of acetylacetone over asymmetrically modified Raney nickel catalyst gave the chiral diastereomer of 2,4-pentanediol selectively with high optical purity. The recrystallization of the hydrogenation product from the ethereal solution gave optically pure (2R*,4R*)-2,4-pentanediol. Thus, (−)-(2R,4R)- and (+)-(2S,4S)-2,4-pentanediol were obtained from the hydrogenation products on using (R,R)- and (S,S)-tartaric acid-NaBr-modified Raney nickel, respectively.
PREPARATION OF S,S-DIALKYL(DIARYL) PHOSPHORODITHIOATES BY MEANS OF TRIMETHYLSILYL PHOSPHORODICHLORIDATE
Authors: Yamaguchi Kazuo , Honda Shinkichi , Hata Tsujiaki 
Published: July 2006

Abstract
Trimethylsilyl phosphorodichloridate prepared by the reaction of methyl phosphorodichloridate with trimethylsilyl bromide was found to be a useful phosphorylating agent for the synthesis of S,S-dialkyl phosphorodithioates.
A CONVENIENT METHOD OF THE SYNTHESIS OF PHOSPHOPEPTIDE VIA AZIRIDINE RING OPENING REACTION
Authors: Okawa Kenji , Yuki Masanori , Tanaka Takumi 
Published: July 2006

Abstract
The reaction of aziridine peptides with dibenzylphosphoric acid and 85% phosphoric acid afforded O-phosphoserine and O-phosphothreonine peptides passing through the ring opening of aziridine in good yields.
KINETIC STUDY ON DENATURATION OF TOBACCO MOSAIC VIRUS COAT PROTEIN BY THE RAPID CIRCULAR DICHROIC SPECTRA MEASUREMENT
Authors: Sano Yoh , Inoue Hideo 
Published: July 2006

Abstract
The kinetics of denaturation of tobacco mosaic virus coat protein has been studied by a stopped-flow spectropolarimeter. The time courses of ellipticity change at 222 nm suggest the denaturation of TMV protein by guanidinium chloride or urea to be a pseudo-first order reaction.
GENERAL BASE-CATALYZED HYDROLYSIS OF 2,2,2-TRIFLUOROETHYL 4-NITROBENZOATE BY α-CYCLODEXTRIN
Authors: Komiyama Makoto , Inoue Shohei 
Published: July 2006

Abstract
α-Cyclodextrin accelerated the hydrolysis of 2,2,2-trifluoroethyl 4-nitrobenzoate at pH 9.6, 20°C. Kinetic analyses and considerable D2O solvent isotope effect (1.7 fold) showed that the reaction proceeds mostly through general base catalysis by α-cyclodextrin with minor contribution of nucleophilic catalysis. This is the first finding of general base catalysis of ester hydrolysis by cyclodextrin.
THE COBALT(III) COMPLEXES CONTAINING GLYCYLGLYCINATE AND IMINODIACETATE, N-METHYLIMINODIACETATE, OR ETHYLENEDIAMINEMONOACETATE AS THE MIXED LIGANDS
Authors: Kawaguchi Hiroshi , Maeda Kiyoko , Ama Tomoharu , Yasui Takaji 
Published: July 2006

Abstract
The mixed ligand complexes, [Co(glygly)(L)] (L: ida, mida, and enma), have been prepared and their structures were discussed on the basis of the 1H- and 13C-NMR data. It has been shown that each terdentate ligand L in these complexes coordinates selectively to cobalt(III) in meridional form. Absorption spectra of these complexes are also reported.
CHEMICAL INTERCONVERSION OF TRYPTOPHAN AND N′-FORMYLKYNURENINE
Authors: Sakiyama Fumio , Nakazawa Takashi 
Published: July 2006

Abstract
A novel reaction to convert 3-alkyl-2-amino-3H-indol-3-ol to 3-alkylindole is described. The yield was 60–80% for four 2-amino-3H-indol-3-ols examined. With aqueous sodium borohydride, 3-alkyl-2-amino-3H-indol-3-ol was reduced and deaminated predominantly to the corresponding indolin-3-ol, which was then dehydrated to 3-alkylindole in acidic media. Eventually a reaction cycle to interconvert tryptophan and N′-formylkynurenine was established.
REGIOSELECTIVE C–C BOND FORMATION OF O-LINALYL-N,N-DIMETHYLHYDROXYLAMINE VIA CARBOPALLADATION
Authors: Hirai Kenji , Ishii Norio , Suzuki Hiroharu , Moro-Oka Yoshihiko , Ikawa Tsuneo 
Published: July 2006

Abstract
Stable carbopalladation complexes were prepared by regioselective addition of active methylene compounds to O-linalyl-N,N-dimethylhydroxylamine (1) in the presence of Pd(II) complexes, and degradated selectively to the corresponding alkene derivatives by treatment with trimethylsilyl chloride.
RADIATION-INDUCED CYCLOREVERSION OF INDENE CYCLOBUTANE DIMERS IN n-BUTYL CHLORIDE BY A CHAIN REACTION MECHANISM
Authors: Majima Tetsuro , Pac Chyongjin , Takamuku Setsuo , Sakurai Hiroshi 
Published: July 2006

Abstract
The cycloreversion of trans,syn- and cis,syn-indene dimers (I and II) occurred upon γ-radiation of n-butyl chloride solutions. The effects of additives and high G values for formation of indene demonstrated that the cycloreversion proceeds by means of a chain reaction mechanism involving cation radicals as chain carriers.
SELF-ASSOCIATION OF PURINE BASES IN WATER-ORGANIC COMPONENT MIXTURES: 6-METHYLPURINE IN WATER-DIMETHYLSULFOXIDE SYSTEM
Authors: Morimoto Satoshi , Kinouchi Makoto 
Published: July 2006

Abstract
Thermodynamic quantities of the self-association of 6-methylpurine in water(1)-dimethylsulfoxide(DMSO)(2)(x2&lt;0.1) mixed solvent have been obtained at 25°C. They decreased remarkably with the mole fraction of DMSO up to about x2=0.012 and then increased steeply. This behavior indicates that DMSO tends to stabilize the solvent structure at its very low content.
[3,3]-SIGMATROPIC REARRANGEMENT OF 2-AZA-4-OXY-1,5-HEXADIENE SYSTEM A NOVEL PYRROLIDINE SYNTHESIS
Authors: Kakimoto Masa-aki , Okawara Makoto 
Published: July 2006

Abstract
3-Acetylpyrrolidines were prepared in high yield when 5-vinyloxazolidines were treated with potassium hydride and 18-Crown-6. The base catalyzed oxy-2-aza-Cope rearrangement features this reaction.
NUCLEOPHILIC ATTACK OF THE ACETYLACETONATE CARBANION ON THE NITRILE CARBON IN trans-[PtCl2(C6H5CN)2]: X-RAY STRUCTURE OF THE PRODUCT N-ACETYL-β-KETOAMINE CHELATE
Authors: Uchiyama Toshihiko , Takagi Kazuhiko , Matsumoto Keiji , Ooi Shun’ichiro , Nakamura Yukio , Kawaguchi Shinichi 
Published: July 2006

Abstract
trans-Dichlorobis(benzonitrile)platinum(II) reacted with thallium(I) acetylacetonate in dichloromethane at room temperature to give three kinds of yellow products. One of them was obtained as fine crystals and revealed by an X-ray analysis to be N-acetyl-β-ketoamine chelate, trans-[Pt(N(COCH3)=C(C6H5)CH=COCH3)2].
PREFERENTIAL CONFORMATION FOR INTRAMOLECULAR EXCIPLEX FORMATION IN CHEMILUMINESCENCE OF THE DIOXETANES, 1-(1-SUBSTITUTED-3-INDOLYL)-6-ARYL-2,5,7,8-TETRAOXABICYCLO[4.2.0]OCTANES
Authors: Nakamura Hideshi , Goto Toshio 
Published: July 2006

Abstract
The title dioxetanes give in polar solvents visible chemiluminescence which is proven to be produced from the intramolecular exciplex between two aromatic substituents on the product diesters by comparison of chemiluminescence of the dioxetanes (2a–2d) and fluorescence of the corresponding diesters (3a–3d). That decomposition of the dioxetanes gives the corresponding diesters (in a singlet excited state) in a preferential conformation for the formation of intramolecular exciplex is also concluded from the above analysis as well as the examination of conformational effects on the exciplex fluorescence of the diesters, 4 and 5.
REACTION OF FURYLLITHIUM WITH ACYLTRIMETHYLSILANES. SPECIFIC GENERATION OF 5-TRIMETHYLSILOXY-3,4-PENTADIENONE ENOLATES
Authors: Kuwajima Isao , Atsumi Kunio , Tanaka Toshihiko , Inoue Tan 
Published: July 2006

Abstract
5-Trimethylsiloxy-3,4-pentadienone enolates can be generated efficiently by treating furyllithium with acyltrimethylsilanes and can be isolated in good yield as their silyl enol ethers.
TWO CONSECUTIVE GEAR MOTIONS IN CONFORMATIONAL INTERCONVERSION IN 9-(2-METHYLBENZYL)TRIPTYCENE DERIVATIVES
Authors: Yamamoto Gaku , Oki Michinori 
Published: July 2006

Abstract
The conformational interconversion among ±sc and ap forms of 9-(2-methylbenzyl)triptycenes is found to occur by two consecutive gear motions: methyl-inside conformers formed by the synchronous rotation about the CH2–Ar and CH2–C9 bonds of the methyl-outside conformers are so unstable that another synchronous rotation takes place in succession to afford methyl-outside conformers. The change in 1H-nmr line shapes and the barriers to rotation are discussed.