中国化学快报

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Synthesis and Characterization of Ferrocenyl Substituted Styryl Octasilsesquioxane

Xiao Yan SONG, Hai Ping GENG, Qi Fang LI

中国化学快报. 2006, 17(04): 427-430.

摘要 ( )

可视化

4-(2-Ferrocenylethenyl)-phenyl-POSS Fc-CH=CH-C₆H₆-(C₅H₉)₇Si₈O₁₂ (FEPS, Fc:ferrocene), containing metal and C=C double bond, was firstly synthesized as a mixture of E/Z isomers by the Wittig reaction. The chemical structure of FEPS was characterized by FTIR, ¹H-, ¹³C and²⁹Si-NMR.

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A Convenient Synthesis of cis and trans-(±)-4-Amino-1-[2-(hydroxyl-methyl)-1, 3-oxathiolan-5-yl]-2(1H)-pyrimidinone

Yi SHEN, Ling XIANG, Yong DENG, Yu Guo ZHONG

中国化学快报. 2006, 17(04): 431-433.

摘要 ( )

可视化

A convenient synthesis of cis-(±) isomer 1 and trans-(±) isomer 2 of lamivudine starting from benzoyloxyacetaldehyde and 1, 4-dithiane-2, 5-diol is described. The key steps include chlorination of oxathiolane lactol 5 by SOCl₂/DMF, followed by coupling with silylated N⁴-acetylcytosine and deprotection. The overall yield was 42.6% and 20.1%, respectively.

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Synthesis of a Pair of Derivatives of N-Methylpyrrole Polyamide

Rong ZHENG, Chang Jin ZHU, Yi LIU, Dong WANG

中国化学快报. 2006, 17(04): 434-436.

摘要 ( )

可视化

A pair of derivatives of tetrameric N-methylpyrrole polyamide were synthesized in order to develop a new method for the study of interaction of the polyamide derivatives with DNA. Indole acetic acid and nicotinic acid were introduced to the polyamide in the synthesized compound, which showed an expected red shift in the UV spectrum. These compounds may function as a potential tool in the detection of the polyamide binding to DNA.

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A Rapid Solid-phase Synthesis to Soluble Oligothiophene Molecular Wires

Hong Ming ZHANG, Xian Hong WANG, Xiao Jiang ZHAO, Ji LI, Fo Song WANG

中国化学快报. 2006, 17(04): 437-440.

摘要 ( )

可视化

A novel method for the preparation of oligothiophene molecular wires is described via a bi-directional solid-phase synthesis. Using an alternating sequence of bromination and Stille coupling reactions, oligomers were obtained up to the heptamer in excellent yield and purity.

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Reduction of Sulphur-containing Aromatic Nitro Compounds with Hydrazine Hydrate over Iron(Ⅲ) Oxide-MgO Catalyst

Qi Xun SHI, Rong Wen LU, Zhu Xia ZHANG, De Feng ZHAO

中国化学快报. 2006, 17(04): 441-443.

摘要 ( )

可视化

Sulphur-containing aromatic amines were prepared efficiently in good to excellent yields by reduction of the corresponding sulphur-containing aromatic nitro compounds with hydrazine hydrate in the presence of iron(Ⅲ) oxide-MgO catalyst. The catalyst exhibited high activity and stability for the reduction of sulphur-containing aromatic nitro compounds. The yields of sulphur-containing aromatic amines were up to 91-99% at 355 K after reduction for 1-4 h over this catalyst.

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Synthesis and Resolution of 10, 11-Dihydro-10-hydroxycyproheptadine

Jian Mei CUI, Da Li YIN

中国化学快报. 2006, 17(04): 444-446.

摘要 ( )

可视化

10, 11-Dihydro-10-hydroxycyproheptadine was synthesized in a new and facile synthetic route and resolved by L-(-)-2-(1, 3)-dioxo-1, 3-dihydroisoindol-2-yl)-propionic acid and D-(+)-tartaric acid, respectively. The free base of the two enantiomers has the same absolute specific rotation value.

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Synthesis and Characterization of Ion-exchange Sulfonated Poly (ether sulfone)

Fan Xiu MENG, Chun Qing ZHANG, Lian LIU, Yuan Yuan ZHANG

中国化学快报. 2006, 17(04): 447-448.

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可视化

N, N'-Bis(3-hydroxyphenyl)-1, 8, 4, 5-naphthalenetetracarboxylic bisimide was prepared from the reaction of 1, 8, 4, 5-naphthalenetetrcarboxylic acid dianhydride and 2-aminophenol in N, N-dimethylformamide. Polymerization of this bisimide with 4, 4'-difluorodiphenylsulfone and disodium 3, 3'-disulfonate4, 4'-difluorodiphenylsulfone gave ion-exchange sulfonated poly(ether sulfone). The structure of the title compound was characterized with ¹H-NMR and its polymer was characterized with FT-IR.

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Preparation of (±)-5, 6, 7-Trioxygenated Dihydrofiavonols and Evaluation of their Superoxide Radical Scavenging Activity

Jing Xu GONG, Yu Bin FENG, Feng WANG, Yan Guang WANG, Hai Bo LI, Yi Hang WU, Xiao Jiang HAO, Xiu Mei WU, Hua BAI, Joachim STÖCKIGT, Yu ZHAO

中国化学快报. 2006, 17(04): 449-452.

摘要 ( )

可视化

The synthesis of (±)-5, 6, 7-trioxygenated dihydroflavonols was carried out. All synthetic compounds were passed through superoxide radical scavenging activity in vitro.Compounds 1e and 1g exhibited significant bioactivity with the inhibitory rates of 68.1% and 80.9% at 40μg/mL, respectively.

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BF₃·OEt₂ Promoted Solvent-free Synthesis of Benzimidazole Derivatives

Rahul R. NAGAWADE, Devanand B. SHINDE

中国化学快报. 2006, 17(04): 453-456.

摘要 ( )

可视化

Differently substituted benzimidazoles have been synthesized in very good yields in solvent-free clnditions from o-phenlenediame and aldehydes im the pressemce of BF₃·OEt₂ as acatalyst. The method is applicable to aromatic, unsaturated and aliphatic aldehydes and to substituted o-phenylenediamines without significant differences.

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Study on the Intramolecular Cyclization through Opening of Epoxide Ⅳ. Cyclization of N-Methyl-N-benzoylmethylene β-Methyl-α, β-epoxypropionamide in Aprotic and Protic Solvents

Li Hong WANG, Liang HUANG

中国化学快报. 2006, 17(04): 457-460.

摘要 ( )

可视化

Intramolecular cyclization of β-methyl substituted epoxide under aprotics (e.g. LDA in benzene) and protic conditions (e.g. LiOH in MeOH/H₂O)both gave a mixture of β-, γ-, δ- and ε-lactam but in different ratio.

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Synthesis of Flurbiprofen via Suzuki Reaction Catalyzed by Palladium Charcoal in Water

Gang LU, Robert FRANZÉN, Xiao Jing YU, You Jun XU

中国化学快报. 2006, 17(04): 461-464.

摘要 ( )

可视化

Flurbiprofen 1, an excellent nonsteroidal an tiinflammatory drug, was synthesized in 5steps in 69% overall yield. The key step of constructing the biaryl fragment was successfully achieved via Pd/C-catalyzed Suzuki coupling reaction in water using sodium tetraphenylborate as phenylation reagent.

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Synthesis and Antioxidant Properties of Novel Silybin Analogues

Jing Xu GONG, Lin Jia WENG, Feng WANG, Yu Bin FENG, Chang Xin ZHOU, Hai Bo LI, Yi Hang WU, Xiao Jiang HAO, Xiu Mei WU, Hua BAI, Joachim STÖCKIGT, Yu ZHAO

中国化学快报. 2006, 17(04): 465-468.

摘要 ( )

可视化

Eight novel silybin analogues (7a-h) were synthesized and their antioxidant properties including the capability of scavenging superoxide anion free radicals and the inhibitory effect on DPPH free radicals were determined. Several synthetic compounds showed comparable antioxidative effect to that of quercetin.

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A New Route for the Synthesis of N-Substituted Diketopiperazine Derivatives

Xi GONG, Xiao Xiao YANG, De Xin WANG

中国化学快报. 2006, 17(04): 469-472.

摘要 ( )

可视化

Eight N-substituted diketopiperazines (DKPs) were synthesized by solid-phase protocols. The introduction of iminodiacetic acid (Ida) and followed another α-amino acid residue as the precursor of DKP framework made the present synthesis to bc very facile and efficient.

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Rapid Microwave-promoted Base-free Suzuki Coupling Reaction of Sodium Tetraphenylborate with Hypervalent Iodonium Salts in Water

Jie YAN, Zhong Shi ZHOU, Min ZHU

中国化学快报. 2006, 17(04): 473-476.

摘要 ( )

可视化

The palladium chloride-catalyzed Suzuki coupling reaction of sodium tetraphenylborate with hypervalent iodonium salts was achieved under microwave irradiation in water without base in excellent yield. A convenient and rapidmethod for formation of carbon-carbon bonds was afforded.

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New Minor Cyclopeptides from Arenaria oreophila (Caryophyllaceae)

Ai Qun JIA, Ning Hua TAN, Jun ZHOU

中国化学快报. 2006, 17(04): 477-480.

摘要 ( )

可视化

New minor cyclic peptides, named arenariphilin C 1 and arenariphilin D 2, were isolated from the whole plants of Arenaria oreophila (Caryophyllaceae). Their structures were determined as cyclo(Pro¹-Pro²-Leu¹-Leu²-Phe-Ser-Gly-Thr) and cyclo (Ser-Cys) on the basis of spectroscopic data, especially by two-dimension NMR (2D NMR) technologies.

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An Abietane Diterpene and a Sterol from Fungus Phellinus igniarius

Ying WANG, Su Juan WANG, Shun Yan MO, Shuai LI, Yong Chun YANG, Jian Gong SHI

中国化学快报. 2006, 17(04): 481-484.

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可视化

A new abietane diterpene 12-hydroxy-7-oxo-5, 8, 11, 13-tetraene-18, 6-abietanolide, together with a new natural sterol stigmasta-7, 22-diene-3β, 5α, 6α-triol have been isolated from the fruiting body of the fungus Phellinus igniarius. Their structures were elucidated by spectroscopic methods including 2D NMR techniques.

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Two New Dihydroflavanoids from Patrinia villosa Juss (Ⅱ)

Jin Yong PENG, Guo Rong FAN, Yu Tian WU

中国化学快报. 2006, 17(04): 485-488.

摘要 ( )

可视化

Two new dihydroflavonoids named villosin A and villosin B were obtained from the traditional Chinese medicinal herb Patrinia villosa Juss. Their structures were elucidated as (2S)-5, 2', 6'-trihydroxy-2", 2"-dimethylpyrano [5", 6":6, 7]flavanone 1 and (2S, 3"S)-5, 2', 6'-trihydroxy-3"-γ, γ-dimethylallyl-2", 2"-dimethyl-3", 4"-dihydropyrano [5", 6":6, 7] flavanone 2 by spectroscopic methods including UV, IR, HR-TOF-MS, 1D NMR and 2D NMR techniques.

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Amplified Electrochemical Immunoassay Using HRP Labeled Protein as an Inhibitor to Silver Deposition in the Presence of H₂O₂

Zhao Peng CHEN, Jian Hui JIANG, Xiao Bing ZHANG, Guo Li SHEN, Ru Qin YU

中国化学快报. 2006, 17(04): 489-492.

摘要 ( )

可视化

A novel electrochemical immunosensor with amplification effect based on the enzyme inhibition of silver deposition was proposed. In this method, the capture antibody was first immobilized onto a gold electrode via a self-assembled layer. After a sandwich immunoreaction, HRP labeled antibody was bound to the gold electrode. The HRP on the electrode inhibited silver deposition when the electrode was incubated in hydroquinone-H₂O₂ solution and silver ion solution.The linear sweep voltammetry was chosen to detect the deposited silver and the result showed that the peak current was linearly proportional to the content of IgG in the range of 50 to 2500 ng/mL with a detection limit of 35 ng/mL.

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A Home-made Simple Set-up for Measurement of Electrochemical Surface Tension Spectrum on a Mercury Drop Electrode

Xiang Qin LIN, Liang Dong FENG, Hao ZHANG

中国化学快报. 2006, 17(04): 493-495.

摘要 ( )

可视化

A setup for recording surface tension curves at a mercury drop during potential scanning is designed based on photo-sensitive detection system. Surface tension spectrum at Hg drop can be recorded by voltammetric study. A Yb(Ⅲ)-NO₂^- catalytic reduction system was used for characterization. The simple, sensitive technique can be expected to provide fresh information on molecular interactions at electrode surfaces.

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A Novel Amperometric Nitric Oxide Sensor Based on Polythionine/Nation Modified Glassy Carbon Electrode

Xiao Xia CHEN, Fang WANG, Yan Xia XU, Sheng Shui HU

中国化学快报. 2006, 17(04): 496-498.

摘要 ( )

可视化

A novel amperometric sensor for the determination of nitric oxide was developed by coating polythionine/nafion on a glassy carbon electrode. This sensor exhibited a great enhancement to the oxidation of nitric oxide. The oxidation peak currents were linear to the concentration of nitric oxide over the wide range from 3.6×10^-7 to 6.8×10^-5 mol·L^-1, and the detection limit was 7.2×10^-8 mol·L^-1. Experimental results showed that this nitric oxide sensor possessed excellent selectivity and longer stability. NO releasing from rat kidney was monitored by this sensor.

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A Novel Real-time Fluorescence Mutant-allele-specific Amplification Method for Rapid Single Nucleotide Polymorphism Analysis

De Bin ZHU, Da XING, Xian LI, Lan ZHANG

中国化学快报. 2006, 17(04): 499-501.

摘要 ( )

可视化

Current methods for single nucleotide polymorphism (SNP) analysis are timeconsuming and complicated. We aimed at development of one-step real-time fluorescence mutant-allele-specific amplification (MASA) method for rapid SNP analysis. The method is a marriage of two technologies: MASA primers for target DNA and a double-stranded DNA-selective fluorescent dye, SYBR Green I. Genotypes are separated according to the different threshold cycles of the wild-type and mutant primers. K-ras oncogene was used as a target to validate the feasibility of the method. The experimental results showed that the different genotypes can be clearly discriminated by the assay. The real-time fluorescence MASA method will have an enormous potential for fast and reliable SNP analysis due to its simplicity and low cost.

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Fluorescence Emission from Small Molecules Containing Amino Group

Dong Jun WANG, Dan Dan JIA, Yong Guang ZHAO, Xi Hai SHEN, Yue Dong YANG

中国化学快报. 2006, 17(04): 502-504.

摘要 ( )

可视化

After the treatment of oxygen gas, the small molecules containing amine group could emit fluorescence. Oxidation was believed to play an important role in the formation of fluorescence centers. Compared to previous results, both small molecules and macromolecules might have the same fluorescence centers.

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Determination Enantiomer Excess (e.e.%) of Chiral Sharpless Epoxides with β-Cyclodextrin Derivatives as Chiral Stationary Phases of Capillary Gas Chromatography

Xue Yan SHI, Pei LIANG, Xi Wu GAO

中国化学快报. 2006, 17(04): 505-508.

摘要 ( )

可视化

Using four β-cyclodextrin derivatives, 2, 6-di-O-benzyl-3-O-heptanonyl-β-CD, 2, 6-di-O-benzyl-3-O-octanonyl-β-CD, 2, 3-di-O-benzyl-6-O-heptanonyl-β-CD, and 2, 3-di-O-benzy1-6-O-octanonyl-β-CD, as chiral stationary phases of capillary gas chromatography (CGC), the enantiomers of Sharpless epoxides were well separated. The enantiomer excess values (e.e.%) of some chiral Sharpless epoxides were also determined successfully using these CDs.

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QCM Detection of Adhesion, Spreading and Proliferation of Human Breast Cancer Cells (MCF-7) on a Gold Surface

Xue En JIA, Zhi Wei ZHANG, Liang TAN, You Yu ZHANG, Qing Ji XIE, Zhi Min HE, Shou Zhuo YAO

中国化学快报. 2006, 17(04): 509-512.

摘要 ( )

可视化

The quartz crystal microbalance (QCM) was used to monitor the one-day incubation of human breast cancer cells (MCF-7) on the gold electrode. In combination with an optical microscope simulation experiment, the cell-population pictures at various stages, the QCM responses to the cells' adhesion, spreading and proliferation on the electrode surface were discussed. The △f₀ and △R₁responses were found mainly from mixed effects of viscodensity and surface stress, and in proportion to the cell coverage, rather than to the number of cells at the electrode. The significant fore-and-aft changes in cyclic voltammetry and electrochemical impedance spectroscopy of the ferri-ferrocyanide redox couple also proved that the cells were adhesion to the gold surface.

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Direct Electrochemical Evidence of the Dissociation and Adsorption Behavior of Acetonitrile at Gold Electrodes by Ultrafast Voltammetry

Zhi Yong GUO, Xiang Qin LIN, Yan Hui XU

中国化学快报. 2006, 17(04): 513-516.

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可视化

Ultrafast cyclic voltammetry was used to study the redox behavior of a gold electrode in acetonitrile. The direct electrochemical evidence of the dissociation and adsorption behavior of acetonitrile at gold electrodes was found. It could be stated that two consecutive redox paths are involved, each with a special adsorption state acting as the reaction intermediate. The mean value, obtained of the electron-transfer rate constant of the second path, was 1.3×10⁵ s^-1 with a standard deviation of 0.24×10⁵ s^-1.

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Characterization on the Mean Molar Absorptivity of Amino Acids in Microbial Lipopeptides

Shi Zhong YANG, Tao CHEN, Bo Zhong MU, Dong Zhi WEI

中国化学快报. 2006, 17(04): 517-520.

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可视化

The molar absorption coefficients of each of 14 kinds of amino acids were determined by the spectrophotometric method, and the mean molar absorption coefficients of 37 different mixtures of each with amino acid composition exactly equivalent to that of the peptide chain of the corresponding lipopeptide were determined based on calculation or experimental. The significance of the results is that the mean molar absorption coefficients strongly demonstrate the regular patterns, though different amino acids bear quite different molar absorption coefficients.

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Combination of Micro-fluidic Chip with Fluorescence Correlation Spectroscopy for Single Molecule Detection

Rui BI, Pu Dun ZHANG, Chao Qing DONG, Ji Cun REN

中国化学快报. 2006, 17(04): 521-524.

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可视化

A single molecule detection technique was developed by the combination of a single channel poly (dimethylsiloxane)/glass micro-fluidic chip and fluorescence correlation spectroscopy (FCS). This method was successfully used to determine the proportion of two model components in the mixture containing fluorescein and the rhodamine-green succinimidyl ester.

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Synthesis and Characterization of Novel Layered Lithium Sodium Silicate (Silinaite) and the Mesoporous Materials from Silinaite

Chun Hui ZHOU, Hong Qiang GUO, Hui Jun CAO, Xiao Nian LI, Zhong Hua GE, Jie LI

中国化学快报. 2006, 17(04): 525-528.

摘要 ( )

可视化

Novel layered silinaite has been synthesized using an aqueous mixture of water glass, LiOH and NaOH under hydrothermal crystallization. Subsequently transformation of silinaite into mesoporous materials (SDM) was achieved at mild condition using cetyltrimethylammonium bromide as structure-directing agents. The resulting samples were characterized by XRD, SEM, FTIR nitrogen adsorption-desorption isotherms and catalytic performance in bulky molecular involved reaction. The results revealed that synthesized mesoporous materials derived from the silinaite exhibited an ordered hexagonal crystal structure with average pore diameter 2.7 nm and BET surface area 817m²/g. The SDM-supported ZnCl₂ catalyst, prepared by impregnationevaporation method, retained the mesoporous structure and showed high selectivity in alkylation of benzene with benzyl chloride.

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A Novel High Active TiO₂/AC Composite Photocatalyst Prepared by Acid Catalyzed Hydrothermal Method

Shou Xin LIU, Xiao Yun CHEN, Xi CHEN, Cheng Lin SUN

中国化学快报. 2006, 17(04): 529-532.

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可视化

A high active novel TiO₂/AC composite photocatalyst was prepared and used for phenol degradation. It was much more active than P-25 and exhibiting good decantability, less deactivation after several runs and less sensitive to pH change. Diffuse reflectance spectra (DRS)revealed that the electronic change in TiO₂ did not occur by the addition of AC. Results of SEM and XRD suggested that better TiO₂ distribution can be achieved when optimal AC content was adopted. The performance of the prepared TiO₂/5AC catalyst revealed great practical potential in wastewater treatment field.

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Hydrophilicity Modification of Addition-cured Room Temperature Vulcanization Silicone Rubber

Yun Xia QI, Shi Gui ZHAO, Wei Feng JIANG, Xin Xin YANG

中国化学快报. 2006, 17(04): 533-536.

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可视化

Allyl terminated polyether was used to improve the hydrophilicity of addition-cured room temperature vulcanization silicone rubber. With the increasing of the polyether, both the hydrophilicity and water absorbed of the vulcanizates were increased. The mechanical properties were also improved by adding the polyether. The result showed that 1.5wt% of the polyether provided the silicone rubber with proper hydrophilicity.

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Effect of pH on the Hydrothermal Synthesis of BN Nanocrystals

Wei FANG, Xiao Peng HAO, Ning LUN, Xian ZHAO, De Liang CUI, Xu Tang TAO, Min Hua JIANG

中国化学快报. 2006, 17(04): 537-540.

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可视化

Boron nitride (BN) has been synthesized using hydrothermal synthesis method. The experimental results showed that the pH value of the reaction solution has an important effect on the yield and phases of BN samples. As the pH value decreased, the content of cBN increased and the yield improved. The increase in cBN content is resulted from the conversion of oBN into cBN under hydrothermal condition, and the growth of cBN nanocrystals may due to the decrease in the reaction speed, thus the crystalline perfection of BN improved when the pH value decreased.

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Novel Gas-liquid Hybrid Discharge Reactor for 4-CP Containing Wastewater Treatment

Yi ZHANG, Ming Hua ZHOU, Le Cheng LEI

中国化学快报. 2006, 17(04): 541-544.

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可视化

In order to improve 4-CP degradation efficiency, a novel gas-liquid hybrid discharge (HD) reactor was developed. Removal of 4-CP with spark-spark discharge (SSD) was higher than that with spark-corona discharge (SCD). Amount of H₂O₂ and O₃ produced with SSD were larger than that with SCD. ·OH formation was increased by the combination of H₂O₂ and O₃.The contribution of ·OH (38% formed by O₃ conversion) oxidation on removal of 4-CP accounted for nearly 60%. The other effects of ultraviolet radiation, intense shock waves and pyrolysis, played partial roles in about 40% of removal rate.

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Depolymerization of Poly(bisphenol A carbonate) in Subcritical and Supercritical Toluene

Zhi Yan PAN, Zhen BAO, Ying Xu CHEN

中国化学快报. 2006, 17(04): 545-548.

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可视化

The depolymerization of poly(bisphenol A carbonate)(PC) in subcritical and supercritical toluene was studied. The experimental parameters, which influence the depolymerization reaction such as temperature (570-633 K), pressure (4.0-7.0 MPa), reaction time (5-60 min), and toluene to PC weight ratio (3.0-11.0), were investigated, and the reaction products were determined by GC, GC/MS and FT-IR spectrometer. It was found that the main product of the depolymerization reaction was bisphenol A(BPA). BPA accounted for over 55.7% of the depolymerization products at reaction temperature 613 K, pressure 5.0-6.0 MPa, reaction time 15 min and toluene/PC weight ratio of around 7.0.

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Molecularly Imprinted Polymers on Chloromethyl Polystyrene Resin Prepared via RAFT Polymerization

Zhen Xia DU, Hong LIU, Zhi Feng FU, Wan Tai YANG

中国化学快报. 2006, 17(04): 549-552.

摘要 ( )

可视化

Surface molecularly imprinted polymers (SMIP) was prepared via the reversible addition-fragmentation chain transfer (RAFT) polymerization on the chloromethyl polystyrene resin (CPR) in the presence of the template D-phenylalanine. The structure of SMIP was characterized by FTIR and SEM. The adsorption behavior of D-phenylalanine of SMIP was preliminarily investigated.

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Thermal Emulsion Polymerization without any Conventional Initiators and Emulsifiers

Yong Zhong DU, Fu Qiang HU, Hong YUAN, Shinzo OMI

中国化学快报. 2006, 17(04): 553-556.

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可视化

Stable poly(styrene-co-sodium styrene suffonate) (P(St-NaSS) nanoparticles with broader size distribution were synthesized by thermal emulsion polymerization without any conventional initiators and emulsifiers. The obtained polymer nanoparticles have higher ξ potential, and the particle sizes have broad distribution. The stability of polymer particles originated from the addition of small amounts of ionic comonomer, NaSS, which can act as an emulsifier in somewhat. The monomer conversion could reach up to about 28 wt% in 48 h, and did not increase by further polymerization when higher polymerization temperature (120℃) was employed. This polymerization system may be give some further understand for mechanism of emulsion polymerization.

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Chloro-propylene Sulfite as Electrolyte Additive for Li/S Batteries

Guo Xiang XU, Qi LU, Lei WEN, Ping HE

中国化学快报. 2006, 17(04): 557-560.

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可视化

Chloro-propylene sulfite (ClPS) was employed as electrolyte additive of Li/S batteries for the first time. Linear potential sweep test showed that the ClPS keeps high electrochemical stability even under the voltage of 5.0V. Being used as electrolyte additive in Li/S batteries, ClPS displayed an excellent property for self-discharge prohibition. With ClPS additive the Li/S cells' initial discharge capacity was 856.2 mAh·g^-1 and 830.8 mAh·g^-1 at the current density of 15 mA·g^-1and 30 mA·g^-1, after 30 cycles the discharge capacities were contained at as high as 753.8 mAh·g^-1 and 715.6 mAh·g^-1. By means of infrared spectra, TG/DTA experiment and element content analysis the speculated reason of ClPS's novel function as additive was proposed.

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Vicarious Michael Addition

Zhong Biao ZHANG, Dillip K. MOHANTY

中国化学快报. 2006, 17(04): 561-564.

摘要 ( )

可视化

C-H bond can undergo vicarious Michael addition reaction (VMA) with doubleactivated double bond in the absence of strong base and catalyst under mild conditions.Intramolecular H-bonding, electron-withdrawing inductive effect, and steric hindrance at α-position of nucleophile facilitates C-H addition over N-H addition. By using VMA, high branching multiplicity, novel branching pattern, controllable density and distribution of functional groups can be envisioned for novel dendrimer synthesis.

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Direct Dynamics Study on CH₂O+CH₃^·→CHO+CH₄ Reaction

Yan QI, Ke Li HAN

中国化学快报. 2006, 17(04): 565-568.

摘要 ( )

可视化

It is still a formidable challenge to study CH₂O+CH₃^·→CHO+CH₄ reaction in the gas phase by traditional dynamics, because of the large number of freedom degrees for the system.In this paper, direct dynamics, in which trajectories were run directly on the DFT potential energy surface, have been applied to the reaction, which gave a direct look in the reaction processes.Two sets of trajectories at different initial orientations of reactants and temperature have been simulated. And the detailed reaction mechanisms have been described.

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2006年, 第17卷, 第04期　刊出日期：2006-04-20

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2006年, 第17卷, 第04期 刊出日期：2006-04-20

2006年, 第17卷, 第04期　刊出日期：2006-04-20