bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tea flavanols inhibit angiotensin-converting enzyme activity and increase nitric oxide production in human endothelial cells
Authors: Persson Ingrid A-L , Josefsson Martin , Persson Karin , Andersson Rolf G G 
Published: July 2006

Abstract
A diversity of pharmacological effects on the cardiovascular system have been reported for Camellia sinensis: antioxidative, antiproliferative and anti-angiogenic activity, and nitric oxide synthase activation. The purpose of this study was to investigate if the connection between tea and angiotensin-converting enzyme (ACE) and nitric oxide (NO) might be an explanation of the pharmacological effects of tea on the cardiovascular system. Cultured endothelial cells from human umbilical veins (HUVEC) were incubated with extracts of Japanese Sencha (green tea), Indian Assam Broken Orange Pekoe (black tea) and Rooibos tea, respectively. The main flavanols and purine alkaloids in green and black tea were examined for their effects on ACE and NO. After incubation with green tea, black tea and Rooibos tea for 10 min, a significant and dose-dependent inhibition of ACE activity in HUVEC was seen with the green tea and the black tea. No significant effect on ACE was seen with the Rooibos tea. After 10-min incubation with (–)-epicatechin, (–)-epigallocatechin, (–)-epicatechingallate and (–)- epigallocatechingallate, a dose-dependent inhibition of ACE activity in HUVEC was seen for all four tea catechins. After 24-h incubation, a significantly increased dose-dependent effect on NO production in HUVEC was seen for the green tea, the black tea and the Rooibos tea. After 24-h incubation with (–)-epicatechin, (–)-epigallocatechin, (–)-epicatechingallate and (–)-epigallocatechingallate, a dose-dependent increased NO production in HUVEC was seen. In conclusion, tea extracts from C. sinensis may have the potential to prevent and protect against cardiovascular disease.
Intrasperm Ca2+ modulation and human ejaculated sperm viability: influence of miconazole, clotrimazole and loperamide
Authors: Gulati Abhishek , Tiwary Ashok K , Jain Subheet , Moudgil Pranab , Gupta Anshu 
Published: July 2006

Abstract
Elevation of intrasperm Ca2+ is reported to influence viability of ejaculated spermatozoa. Human spermatozoa possess inositol triphosphate (IP3)-sensitive Ca2+ stores, which can be targeted for increasing intrasperm Ca2+ level. The influence of agents affecting Ca2+ homeostasis has been investigated. Miconazole nitrate, clotrimazole and loperamide hydrochloride produced a dose- and time-dependent decrease in viability, each requiring respectively 0.5, 1.0 and 1.0 mM for producing death of all sperm cells immediately upon addition to ejaculated human semen samples. The reduction in sperm viability was accompanied by elevation of intrasperm Ca2+ and was not affected by presence or absence of extracellular Ca2+. Significantly (P &lt; 0.05) less time was required for producing complete loss of sperm viability and increasing intrasperm Ca2+ when any of these drugs was added to sperm cells previously treated with selected agents affecting Ca2+ homeostasis. This enhanced spermicidal activity of miconazole, clotrimazole and loperamide appeared to be due to further mobilization of Ca2+ from partially depleted intrasperm Ca2+ stores. Synergism of spermicidal activity and intrasperm Ca2+ elevation by miconazole or clotrimazole was observed when Ca2+ efflux from sperm cells was simultaneously inhibited by 2′,4′-dichlorobenzamil hydrochloride, a Na+-Ca2+ exchange inhibitor. The spermicidal activity of miconazole, clotrimazole or loperamide due to elevation of intrasperm Ca2+ and its synergism, therefore, has great potential for exploitation of these drugs as contact spermicides.
ANOMALOUS ELECTRICAL BEHAVIOURS IN [(C6H5)3PCH3](TCNQ)2 AND [(C6H5)3AsCH3](TCNQ)2 AT HIGH PRESSURES
Authors: Shirotani Ichimin , Kawamura Haruki , Iida Yoichi 
Published: July 2006

Abstract
The resistance in [(C6H5)3PCH3](TCNQ)2 and [(C6H5)3AsCH3](TCNQ)2 increased with increasing pressure and reached the maximum value at approximately 20 Kbar. The anomalous electrical behaviours at high pressures were discussed.
EVIDENCE FOR THE PRESENCE OF CONTACT TERM CONTRIBUTION TO LANTHANIDE-INDUCED ISOTROPIC SHIFTS IN 13C AND 19F NMR SPECTRA OF ALIPHATIC COMPOUNDS: CAUTION FOR APPLICATIONS OF LANTHANIDE SHIFT REAGENTS
Authors: Kainosho Masatsune , Ajisaka Katsumi , Tori Kazuo 
Published: July 2006

Abstract
Evidence for the presence of the contact term contribution besides the dipolar interaction has been presented in paramagnetic shifts induced by lanthanide shift reagents in 13C and 19F NMR spectra of several aliphatic alcohols, ketone, amines, and nitriles. Thus, it is suggested that caution should be exercised in their applications.
SYNTHESIS OF NORBORNENE EPISULFIDES USING ARENETHIOSULFENYL CHLORIDES
Authors: Fujisawa Tamotsu , Kobori Takeo 
Published: July 2006

Abstract
Preparation of new kinds of norbornene episulfides by use of arenethiosulfenyl chlorides has been investigated. Norbornene and 7,7-dimethylnorbornene afforded exo and endo epithio derivatives, respectively. Norbornadiene gave a mixture of exo and endo monoepithio compounds. The structure of the episulfides and of the intermediately formed adducts of the norbornenes with the chlorides is discussed on the basis of nmr spectra.
STERIC EFFECTS IN COMPLEXATION OF N-ALKYLIDENEANILINES WITH TRIS(DIPIVALOMETHANATO)EUROPIUM
Authors: Iwamura Hiizu , Tsuchimoto Michiko , Nishimura Shigeo 
Published: July 2006

Abstract
The pmr paramagnetic shifts induced by Eu(DPM)3 have been studied in a series of N-sec-alkylideneanilines and related to their structures around the C=N bond. Steric effects in complexation with Eu(DPM)3 are discussed from the values of the intrinsic paramagnetic shifts, Δmax , and the complexation equilibrium constants.
REMOTE PARTICIPATION OF A SULFUR ATOM TO THE PROTON EXCHANGE OF 1,3,5-TRITHIANE DERIVATIVES
Authors: Fukunaga Michio , Oki Michinori 
Published: July 2006

Abstract
The H–D exchange at the 2-position of 2,4,6-triinethyl-1,3,5-trithiane derivatives was found to be accelerated, by a large factor, by converting the sulfur atom at the 5-position to the sulfinyl or the sulfonyl group. The results are interpreted by assuming the remote participation of the sulfur atom. The slow H–D exchange of a 1,3,5-oxadithiane derivative is an additional support for the above assumption.
THE REACTION OF TROPONOID WITH YLIDE. V. THE REACTION OF TROPYLIUM- AND ALKOXYTROPYLIUM ION WITH STABLE SULFUR YLIDE
Authors: Sugimura Yukio , Iino Kimio , Kawamoto Isao , Kishida Yukichi 
Published: July 2006

Abstract
Tropylium ion reacted with stable sulfur ylides accompanying with the rearrangement of the seven membered ring to afford benzal derivatives. Analogous reaction of alkoxytropylium ion afforded o- and p-alkoxybenzylidene derivatives.
SYNTHESIS AND REACTION OF A SERIES OF SUBSTITUTED BENZYL ESTERS OF GUANOSINE 3′-PHOSPHATE
Authors: Satoh Kimihiko , Inoue Yasuo 
Published: July 2006

Abstract
Four new substituted benzyl esters of guanosine 3′-phosphate have been prepared, and the acid- and base-catalyzed transphosphorylation reactions have been studied in 0.2M HCl and 0.2M NaOH solutions at 35°. A linear relationship exists between the logarithms of the base-catalyzed rate constants and para substituent constants, σp°. A positive ρ value of +1.24 was obtained. In contrast to this, the rate of the acid-catalyzed transphosphorylation was found to be little affected by the corresponding change in substitution.
PHOTO-INDUCED FRIEDEL-CRAFTS TYPE REACTION OF CYCLOHEXENE TO BENZENE RING
Authors: Tada Masaru , Shinozaki Hiraku 
Published: July 2006

Abstract
Ultraviolet irradiation of toluene or anisole in the presence of cyclohexene and catalytic amount of BF3-etherate gave cyclohexyltoluene or cyclohexylanisole. Irradiation of β-(1-cyclohexenyl)ethylbenzene (v) under the same reaction conditions afforded octahydrophenanthrene VII.
STUDIES ON MTRO SUGARS. V. A NOVEL SYNTHESIS OF METHYL 5-O-BENZOYL-2,3-DIACETAMIDO-2,3-DIBEOXY-β-d-RIBOFURANOSIDE
Authors: Takamoto Tetsuyoshi , Tanaka Hozumi , Sudoh Rokuro 
Published: July 2006

Abstract
Treatment of methyl 5-O-benzoyl-2,3-dideoxy-3-nitro-β-d-glycero-pent-2-enofuranoside (4) with hydrazoic acid in chloroform afforded quantitatively methyl 2-azido-5-O-benzoyl-2,3-dideoxy-3-nitro-β-d-ribofuranoside (5) which was easily led to the corresponding 2,3-diacetamido-ribofurancside derivative (6). Structure of 5 was determined by the specific rotation and its p.m.r. spectrum data.
CARBONYLATION IN THE SbCl5-LIQUID SULFUR DIOXIDE SYSTEM. THE CARBOXYLIC ACID ESTER SYNTHESIS FROM ALKYL CHLOROSULFITE AND DIALKYL SULFITE
Authors: Nojima Masatomo , Shiba Fumiaki , Tokura Niichiro 
Published: July 2006

Abstract
A new synthesis of fatty acid esters by the carbonylation of alkyl chlorosulfite and dialkyl sulfite in SbCl5-liq.SO2 system containing ethanol has been described. The reactions of dialkyl sulfites in this medium gave esters in high yields and with lesser skeletal rearrangement.
EMISSION SPECTRA OF XYLENES BY CONTROLLED ELECTRON IMPACT
Authors: Ogawa Teiichiro , Tsuji Masaharu , Toyoda Minoru , Ishibashi Nobuhiko 
Published: July 2006

Abstract
The emission spectra of o-, m- and p-xylenes were observed by exciting them with controlled electron beam of 200 – 300 V. A characteristic band of the aromatic hydrocarbon was observed in the 270 – 320 nm region. However, the intensity and the vibrational structure of the band of p-xylene were different from those of o- and m-xylenes.
NOVEL SYNTHESIS AND ABSOLUTE CONFIGURATION OF SEMPERVIROL
Authors: Matsumoto Takashi , Imai Sachihiko , Matsubayashi Tomio , Tsunenaga Fukuko , Fukui Kenji 
Published: July 2006

Abstract
Friedel-Crafts reaction of methyl 12-bromodehydroabietate (IV) with acetyl chloride afforded methyl 13-acetyl-14-bromo-12-isopropyldeisopropyldehydroabietate (V), its cis-isomer (VI), and methyl 12-acetyldehydroabietate (VII). Conversion of V to sempervirol (I) was successfully carried out. The absolute configuration of sempervirol has also been assigned.
DECOMPOSITION OF BENZOYL PEROXIDE IN THE PRESENCE OF POLY-p-N,N-DIMETHYLAMINOSTYRENE
Authors: Kunieda Norio , Mochizuki Hideaki , Kinoshita Masayoshi 
Published: July 2006

Abstract
Benzoyl peroxide(BPO) decomposes readily in the presence of poly-p-N,N-dimethylaminostyrene(poly-DMAS), and the initial rate of the decomposition of BPO in the presence of poly-DMAS is about 23 times faster than that in the presence of N,N-dimethylaniline. The fact of the enhancement of the rate attributed to polymeric effect of poly-DMAS and the data of kinetics were discussed.
SUCCESSIVE DETERMINATION OF SULFIDE, THIOSULFATE AND SULFITE IONS BY POTENTIOMETRIC ARGENTOMETRIC TITRATION
Authors: Ikeda Sanae , Satake Hiromu 
Published: July 2006

Abstract
Sulfide, thiosulfate and suifite ions in their mixed solution were successively titrated without any separation procedure. These ions were precisely titrated with a silver nitrate solution by the potentiometric method using a silver–silver sulfide electrode and a silver–silver iodide electrode as the indicator electrodes. Sulfide and thiosulfate were titrated directly. Then, suifite was determined indirectly by titrating the iodide ion generated by addition of iodine.
PHOTOINDUCED REACTIONS. LXVII. PHOTOSENSITIZED OXYGENATION OF N-SUBSTITUTED 1,2,3,4-TETRAHYDROCARBAZOLES
Authors: Saito Isao , Imuta Mitsuru , Matsuura Teruo 
Published: July 2006

Abstract
Rose bengal-sensitized photooxygenation of N-methyl- (1a), N-methyl-6-nitro- (1b), and N-acetyl- (1c) 1,2,3,4-tetrahydrocarbazoles was investigated. The N-methyl derivatives underwent oxidative cleavage of the enamine double bond to give exclusively 2, whereas the N-acetyl derivative in water-containing solvents gave predominantly 3, possibly via a zwitterionic peroxide intermediate.
REACTIONS OF β-d-HEXOPYRANOSIDE INVOLVING α-NITROOLEFIN STRUCTURE WITH SOME S-YLIDES
Authors: Sakakibara Tohru , Takamoto Tetsuyoshi , Sudoh Rokuro , Nakagawa Toshio 
Published: July 2006

Abstract
Treatment of methyl 4,6-O-benzylidene-2,3-dideoxy-3-nitro-β-d-erythro-hex-2-enopyranoside (1) with dimethylsulfoxonium methylide and dimethylsulfuranylidene acetophenone afforded the corresponding cyclopropane derivative 3 (75%) and 4 (71%), respectively. In the case of ethyl (dimethylsulfuranylidene) acetate, however, stable ylide (6) which involves two isomers was obtained in 75% yield. Catalytic reduction of 6 gave quantitatively ethoxycarbonylmethyl derivative (7) which has gluco-configuration.
THE MOLECULAR STRUCTURES OF TETRANACTIN AND ITS ALKALI METAL ION COMPLEXES
Authors: Iitaka Yoichi , Sakamaki Toshio , Nawata Yoshiharu 
Published: July 2006

Abstract
Molecular structures of tetranactin and its alkali metal ion complexes were determined by the X-ray crystal structure analysis. Molecular shape of free tetranactin is fairly flat, elongated and twisted, and outline of the molecule resembles that of propeller. Molecular conformation of the complexes is similar to that of K+-nonactin complex. A complex formation mechanism is proposed.
AROMATIC SOLVENT-INDUCED SHIFT (ASIS) . A NOVEL APPROACH
Authors: Nakagawa Naoya , Niki Kunio , Takeuchi Yoshito , Kumagai Izumi 
Published: July 2006

Abstract
The aromatic solvent-induced shift (ASIS) has been explained in terms of the dipole-induced dipole interaction. It can hardly account for the experimental results. The dipole-quadrupole interaction seems better to explain ASIS. A preliminary calculation has been carried out for acetone in benzene.
COMPLEX FORMATION IN THE GROUND AND EXCITED STATES OF THE PYRENE-N,N-DIMETHYLANILINE SYSTEM
Authors: Yoshihara Keitaro , Futamura Kazuyoshi , Nagakura Saburo 
Published: July 2006

Abstract
From the measurement of absorption and fluorescence spectra, a 1:1 electron-donor-acceptor complex formation in the ground state was confirmed for the pyrene-N,N-dimethylaniline system which is a well-known exciplex formation system, the equilibrium constant being determined to be 0.2 M−1.
CRYSTAL AND MOLECULAR STRUCTURE OF INTRAMOLECULAR CYCLOADDUCT OF DICYCLOHEPTATRIENYL KETONE BY PHOTOCHEMICAL REACTION
Authors: Kabuto Chizuko , Kayama Yasutaka , Oda Masaji , Kitahara Yoshio 
Published: July 2006

Abstract
A Photochemical reaction of dicycloheptatrienyl ketone affords a crystalline intramolecular (π2s+π6s) cycloadduct, the structure of which has been determined by X-ray analysis.
PHOTOELECTRON SPECTRA OF NITRO-COMPOUNDS
Authors: Kobayashi Tsunetoshi , Nagakura Saburo 
Published: July 2006

Abstract
Molecular photoelectron spectra of nitromethane and nitrobenzenes were measured. The assignment of the observed spectra was made, the results of the CNDO/2 and extended Hückel calculations being referred. The steric hindrance effect was found to be significant in the interpretation of the observed photoelectron spectra.
FORMATION OF BIACETYL IN THE PHOTOOXIDATION OF ACETALDEHYDE WITH THE URANYL ION
Authors: Sakuraba Shukichi , Matsushima Ryoka 
Published: July 2006

Abstract
In contrast to earlier reports of the formation of acetic acid, a deoxygenated aqueous acid solution containing 0.01 F uranyl ion and excess acetaldehyde gave biacetyl as the main organic oxidation product, upon irradiation with λ≥3650 Å from a 500–W high pressure mercury lamp, at 5∼15°C.
REACTION OF TOLUENE WITH HYDROGEN ATOMS AT ELEVATED TEMPERATURES
Authors: Amano Akira , Horie Osamu , Hanh Nguyen Hieu 
Published: July 2006

Abstract
Reactions of toluene and hydrogen atoms were carried out at 300–780°K under 6 mmHg pressure, Methylcyclohexadienes and methylcyclohexenes were main products in the vicinity of room temperature, while benzene and ethylbenzene were formed with high selectivities at higher temperatures.
REDUCTION OF 7-HALO-7-FLUORO-2,5-DIOXABICYCLO[4.1.0]HEPTANES WITH TRI-n-BUTYLTIN HYDRIDE
Authors: Yamanaka Hiroki , Shimamura Toshio , Teramura Kazuhiro , Ando Teiichi 
Published: July 2006

Abstract
The inversion of the 7-endo-fluoro-2,5-dioxabicyclo[4.1.0]hept-7-yl radical, formed in the reduction of 7-endo-fluoro-7-exo-halo-2,5-dioxabicyclo[4.1.0]heptane with tri-n-butyltin hydride, to the corresponding 7-exo-fluoro radical occurs much more rapidly than its hydrogen abstraction from the tin hydride.
A SIMPLE METHOD FOR PREPARATION OF 1-CYANO-1,2-DIAMINOETHYLENE DERIVATIVES THROUGH NICKEL-ISOCYANIDE COMPLEXES
Authors: Otsuka Sei , Nakamura Akira , Ito Kazuo 
Published: July 2006

Abstract
1-Cyano-1,2-diaminoethylene derivatives, R-C(NH-t-Bu)=C(NH-t-Bu)CN were found obtainable from isocyanide oligo-insertion complexes, R[C=N(t-Bu)]3NiX(t-BuNC), by reaction with, protic reagents, e.g. dimethylglyoxime. N,N′-Di-t-butyl-C-acylglycinamide, RCO-CH(NH-t-Bu)CONH-t-Bu, was also isolated from the same reaction in wet conditions.
REACTIONS OF HEXAFLUOROTHIOACETONE DIMER WITH ALCOHOLS IN THE PRESENCE OF FLUORIDE ION
Authors: Ishikawa Nobuo , Kitazume Tomoya 
Published: July 2006

Abstract
Hexafluorothioacetone dimer [1] in KF/DMF system reacted with alcohols to give disulfides 2 and alkylthio compounds 3. The reaction mechanism was speculated.
A NOVEL ASPECT AGAINST THE “ORBITAL SYMMETRY CORRELATION IN THE SENSITIZATION”
Authors: Tokumaru Katsumi , Sakuragi Hirochika , Takahashi Yasushi 
Published: July 2006

Abstract
An aspect against Ullman’s postulate of “orbital symmetry correlation in the sensitization” for the aromatic hydrocarbon-sensitized reaction of 2-benzylidene-4-phenyl-3-buten-4-olide is now presented, by showing that the lactone efficiently reabsorbes fluorescence emitted from the hydrocarbon sensitizers and its wavelength seems to govern the course of the reaction.
THE PYROLYSIS OF TRICYCLCO[3.3.1.02,8]NONA-3,6-DIENE (BARBARALANE)
Authors: Tsuruta Haruki , Kimagai Tsutomu , Mukai Toshio 
Published: July 2006

Abstract
Vapor phase pyrolysis of barbaralane (2) produced vinylcycloheptatriene (3), cis-8,9-dihydroindene (4) and allylbenzene (5). The formation of 4 was interpreted by considering 7-vinyl-1,3,5-cycloheptatriene (7) as an intermediate.
A CONVENIENT METHOD FOR THE SYNTHESES OF BENZYL N-MONOALKYLCARBAMATES AND N-BENZYLOXYCARBONYLAMINO ACIDS
Authors: Taguchi Takeo , Mukaiyama Teruaki 
Published: July 2006

Abstract
A convenient method for the preparations of benzyl N-monoalkylcarbamates and N-benzyloxycarbonylamino acids have been established. Benzyl N-monoalkylcarbamates were obtained in good yields by the reactions of potassium salt of benzyl N-(p-chlorophenylthio)carbamate with alkyl halides and the subsequent treatment of the alkylated carbamates with p-chlorobenzenethiol.
PREPARATION AND SOME PROPERTIES OF A NEW COMPOUND CONTAINING MoO3, Al2O3 AND SiO2
Authors: Ueno Akifumi , Kotera Yoshihide 
Published: July 2006

Abstract
A new compound containing MoO3, Al2O3 and SiO2 was prepared by heating their mixture in a proper proportion at 1200°C for 12 hours. This compound was obtained in the form of small needle-like crystals, whose colour is slightly pale gray. Its composition was determined to be \frac16MoO3·Al2O3·2SiO2 by the chemical analysis. Crystallographic properties and preparative method of this compound were discussed in this report.
SOLVATION OF BIS(2,9-DIMETHYL-1,10-PHENANTHROLINE)COPPER(I) CATION BY ACETONE
Authors: Miyoshi Katsuhiko , Tominaga Toshihiro , Yamamoto Yuroku 
Published: July 2006

Abstract
Conductance of bis(2,9-dimethyl-1,10-phenanthroline)Cu(I) perchlorate was measured at 25°C in 1-propanol/acetone mixtures with about the same dielectric constants. The derived parameters have shown that addition of acetone to propanol decreases the ionic association of the chelate salt. This behavior can be interpreted in terms of the solvation of acetone to the chelate cation.
A NOVEL SYNTHESIS OF OPTICALLY ACTIVE AZETIDINE-2-CARBOXYLIC ACID
Authors: Miyoshi Muneji , Sugano Hiroshi , Fujii Toshiyuki , Ishihara Teruo , Yoneda Naoto 
Published: July 2006

Abstract
Treatment of tosyl-l-homoserine lactone (I) with hydrogen bromide, followed by recyclization by the use of sodium hydride below 20°C, gave tosyl-l-azetidine-2-carboxylic acid (III). After the detosylation, the optically active azetidine-2-carboxylic acid (IV) was obtained in a good yield.
ZUR SYNTHESE DER OLIGOKONDENSATE AUS EINIGEN NUCLEINBASENHALTIGEN PROPANDIOLEN
Authors: Kawabata Toshio , Ueda Nasuo , Takemoto Kiichi 
Published: July 2006

Abstract
Die purin- sowie pyrimidinbasenhaltigen Propandiole wurden mit Phenylphosphorodichloridat umgesetzt. In einigen Fällen wurden oligomere Kondensate gewonnen, die Phosphoratome in der Hauptkette und Nucleinbasen in der Seitenkette enthalten. Aus dem neu hergestellten, ein Adeninrest enthaltenden Carbonat wurde durch Umsetzung mit Phosphorsäure auch die ähnliche Oligomere erhalten.
HEATS OF SOLUTION OF COBALT(III) ACETYLACETONATE IN ALCOHOLS AND WATER
Authors: Tarumoto Tsunehiko , Yamamoto Yuroku 
Published: July 2006

Abstract
Heats of solution of cobalt(III) acetylacetonate in alcohols and water were measured and the results were related to the number of hydroxyl groups and the cohesive energy densities of solvents. Heats of solution of the same chelats were also measured in dilute carbon tetrachloride solutions of alcohols. From the results, it was found that alcohols can exist completely as monomer at an extremely low concentration range.
ON THE BIRADICAL VS. CONCERTED MECHANISMS FOR THE THERMAL REARRANGEMENT OF TRICYCLO[3.3.0.02,6]OCTA-3,7-DIENE TO SEMIBULLVALENE
Authors: Iwamura Hiizu , Kihara Hiroshi 
Published: July 2006

Abstract
A symmetry-allowed concerted process is proposed by the MINDO/2 MO study for the facile rearrangement of tricyclo[3.3.0.02,6]octa-3,7-diene 1 to semibullvalene 2. The reaction path involves the cleavage of an allylic bond by twisting the molecule with C2 symmetry operation kept until the geometry corresponding to the transition state for the Cope rearrangement of 2 is obtained.
A MAGNETIZATION STUDY ON TETRAKIS(DIETHYLDITHIOCARBAMATO)DICOPPER(II)
Authors: Mcgregor Kenneth T , Eckberg Richard P , Hatfield William E 
Published: July 2006

Abstract
A magnetization study on tetrakis(diethyldithiocarbamato)dicopper(II) has shown that the dimeric molecule has a triplet ground state resulting from a ferromagnetic intradimer interaction.
Synthesis of Gemcitabine Analogues as Potential Anti-tumor Agents
Authors: Ding Yili 
Published: July 2006

Abstract
Gemcitabine analogue was designed to keep the anti-tumor activities but not to be the substrate of deoxycytidine deaminase. By coupling the 2-deoxy-2,2-difluoro sugar derivative with a bicyclic base, the gemcitabine analogue was synthesized, and its configuration was confirmed by 2D NMR studies.
Synthesis and Luminescent Properties of Novel Twisted Copolymers Containing Dithienophosphole Oxide/Dithienosilole and Spirobifluorene
Authors: Zhang Zhaowei , Li Jun , Huang Bin , Qin Jingui 
Published: July 2006

Abstract
Two new series of twisted polymers, poly[fluorenedithieno[3,2-b:2′,3′-d]phosphole oxide-alt-2,2′-spirobifluorelene] (PFDTPO-SBF) and poly[fluorenedithieno[3,2-b:2′,3′-d]silole-alt-2,2′-spirobifluorelene (PFDTS-SBF), in which the backbone was sufficiently twisted and the effective conjugation length was controlled, were synthesized through Suzuki coupling reaction. The introduction of DTPO or DTS into π-conjugated main chains apparently turned the emission wavelength, and possessed the low-lying LUMO energy levels.
Selective Preparation of MoO3 and HxMoO3 Nanobelts in Molybdenum–Hydrogen Peroxide System
Authors: Hu XiaoKai , Ma DeKun , Xu LiQiang , Zhu YongChun , Qian YiTai 
Published: July 2006

Abstract
In this letter a new synthetic strategy has been established for MoO3 nanobelts by oxidizing Mo powders with H2O2 in neutral water at 70 °C and a subsequent hydrothermal treatment at 140 °C. By introducing alcohol into this system, we can selectively prepare blue HxMoO3 nanobelts. The photoluminescence (PL) property can be greatly altered before and after hydrogen incorporation into MoO3 nanobelts. The mechanism on formation process of nanobelts has also been addressed.