中国化学快报

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The First Total Synthesis of 3-Oxo-11, 12, 13-trihydroxyeudesm-4-ene

Yu Kun GUAN, Ping LI, Li Jing FANG, Yu Lin LI

中国化学快报. 2005, 16(06): 711-712.

摘要 ( )

可视化

The first total synthesis of 3-oxo-11, 12, 13-trihydroxyeudesm-4-ene, a highly oxygenated natural eudesmane, was described.

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Synthesis of a Dopamimetic Thionated Dipeptide Prodrug of L-DOPA

Ye WANG, Zhan Zhu LIU, Shi Zhi CHEN

中国化学快报. 2005, 16(06): 714-715.

摘要 ( )

可视化

L-DOPA has gained widespread credit over the past decades as being the mainstay of the pharmacological treatment of Parkinson's disease. However, there are many adverse effects associated with the use of L-DOPA. The prodrug approach is the most promising way to solve the problem. In this article, a thionated dipeptide prodrug of L-DOPA 11 was synthesized via 10 steps in a total yield of 26.5% from L-DOPA.

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A New Approach for Asymmetric Synthesis of (-)-Umbelactone

Hua Wei LIU, Yu Lin LI

中国化学快报. 2005, 16(06): 716-718.

摘要 ( )

可视化

A concise and efficient total synthesis of (-)-umbelactone 1, an occurring γ-hydroxymethyl-α, β-butenolide from Memycelon umbelatum Burm, is described. The synthesis features the use of a ring closing metathesis strategy.

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Facile and Rapid Solid Phase Synthesis of Monodisperse Oligo(1, 4-phenyleneethynylene)s

Guo Rong LI, Xian Hong WANG, Ji LI, Xiao Jiang ZHAO, Fo Song WANG

中国化学快报. 2005, 16(06): 719-722.

摘要 ( )

可视化

An extremely facile and rapid solid phase route free of column chromatographic purification for the synthesis of the soluble monodisperse oligo(1, 4-phenyleneethynylene)s up to~60(Å) was presented.

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Synthesis and Antibacterial Activity of 8-Substituted Phenyl-1-pyridin-3-yl-5H-bis[1, 2, 4]triazolo[3, 4-b;4', 3'-d] [1, 3, 4] thiadiazines

Guo Qiang HU, Song Qiang XIE, Wen Long HUANG, Hui Bin ZHANG

中国化学快报. 2005, 16(06): 723-726.

摘要 ( )

可视化

To find new structural leading compounds for the research of the multidrug resistant of antibacterial agents, five novel 8-substituted phenyl-1-pyridin-3-yl-5H-bis[1, 2, 4] triazolo[3, 4-b;4', 3'-d] thiadiazines were prepared from the corresponding intermediates of 3-(5-substituted phenyl[1,3,4]oxadiazol-2-ylmethylsulfanyl)-5-pyridin-3-yl-[1,2,4]triazol-4-ylamines via intramolecular cyclization and the antibacterial activity in vitro against Gram-postive (G⁺) and Gram negatiye (G^-) bacteria was primarily evaluated.

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First Total Synthesis of (±)-13-Hydroxy-8 (14)-abietene

Cheng Lu ZHANG, Ying Ge MA, Chun Li SUN, Ye Hong QIU

中国化学快报. 2005, 16(06): 727-728.

摘要 ( )

可视化

The first total synthesis of (±)-13-hydroxy-8 (14)-abietene was accomplished in 20.1%yield via a strategy of AC→ABC, in which the reduction of compound 5 with Li/NH₃ gave the key intermediate 6 and the title compound was then obtained by the reaction of compound 6 with Grignard reagent.

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[2+2] Photocycloaddition of[60]Fullerene with Podophyllotoxin Derivative Containing Cyclohexadienone Group

Qian Rong LI, Li Qun LI, Sha YANG

中国化学快报. 2005, 16(06): 729-732.

摘要 ( )

可视化

Photochemical[2+2] cycloaddition of C₆₀ with podophyllotoxin derivative containing a cyclohexadienone group in o-dichlorobenzene afforded an isomeric mixture of adducts and a pure adduct of C₆₀-fused podophyllotoxin derivatives. The structures of the products were characterized by MS, NMR and IR spectra.

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Efficient Amide Based Halogenide Anion Receptors

Hong Xing WU, Feng Hua LI, Hai LIN, Shou Rong ZHU, Hua Kuan LIN

中国化学快报. 2005, 16(06): 733-735.

摘要 ( )

可视化

In this paper, we present the synthesis and anion recognition properties of the amide based phenanthroline derivatives 1, 2 and 3. In all cases 1:1 receptor:anion complexes were observed. The receptors were found to be selective for fluoride and chloride respectively over other putative anionic guest species.

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A Taxatetraene from Microbial Transformation of Sinenxan A

Jun Gui DAI, Lin YANG, Jun Ichi SAKAI, Masayoshi ANDO

中国化学快报. 2005, 16(06): 736-738.

摘要 ( )

可视化

Sinenxan A[2α, 5α, 10β, 14β-tetraacetoxytaxa-4(20), 11-diene, 1] was biotransformed by a filamentous fungus, Aspergillus niger JCM 5546, and an unusual taxatetraene[2α,5α-acetoxytaxa-4(20), 10(11), 12(18), 13(14)-tetraene, 2], together with two known products,10β-deacetyl sinenxan A (3) and 10β, 14β-dideacetyl sinenxan A (4) were produced.

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Synthesis and Two-photon Absorption Properties of s-Triazine Derivatives

Lei YIN, Yue Zhi CUI, Qi FANG, Gang XUE, Gui Bao XU, Wen Tao YU

中国化学快报. 2005, 16(06): 739-742.

摘要 ( )

可视化

Two new s-triazine derivatives, which belong to linear dipolar type and triangle octupolar type respectively, have been synthesized. The structure of the dipolar compound has been determined by X-ray diffraction. The two-photon absorption cross-section σ, and the two-photon excited fluorescence (TPEF) intensities are increased significantly from dipolar compound to octupolar compound.

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Preparation and Analysis of Acylated Insulin with Dehydrocholic Acid

Tao HUANG, Kai Xun HUANG

中国化学快报. 2005, 16(06): 743-746.

摘要 ( )

可视化

Insulin was chemically modified with dehydrocholic acid without the use of protecting agents and the main monoacylated insulin. ε-N^B29-Dehydrocholyl insulin was obtained selectively and analyzed by PAGE, HPLC and MALDI-TOF-MS.

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Sulfamic Acid as a Cost-effective Catalyst for Acetolysis of Cyclic Ethers

Wei Zhong GONG, Bo WANG, Yan Long GU, Liang YAN, Li Ming YANG, Ji Shuan SUO

中国化学快报. 2005, 16(06): 747-750.

摘要 ( )

可视化

Sulfamic acid has been used as an efficient catalyst and green alternative for conventional acidic materials to promote the acetolysis reaction of THF to produce 1,4-diacetoxybutane. This method is also applicable in the acetolysis of other cyclic ethers, such as methyl substituted THF and tetrahydropyran and 1,4-dioxane which is less reactivity.

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Synthesis and Photochromic Properties of Azido Analogues of Spiropyran and Spirooxazine as Nucleic Acid Labeling Reagent

Hui GUO, Wu Xin ZOU, Qi JI, Ji Ben MENG

中国化学快报. 2005, 16(06): 751-754.

摘要 ( )

可视化

A series of photo active azido analogues have been synthesized and their photochromic properties have also been investigated by UV-Vis spectrum. It will be used for the rapid and reliable preparation of large amounts of stable, non-radioactive labeled DNA and RNA hybridization probes. And it is supposed to be easily detected for its photochromic properties.

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Synthesis of Nitrogen-containing Cyclopeptides from N-Terminal Lysine Precursor on Solid Supports

Xiao Xiao YANG, Chuan Liang QIU, De Xin WANG

中国化学快报. 2005, 16(06): 755-758.

摘要 ( )

可视化

Three synthetic routes for the preparation of nitrogen containing cyclic compounds have been developed, in which the assembling of Fomc-Lys(Boc) residue at N-terminal of resin-bound intermediates is a key prerequisite. Six peptides with nitrogen containing local cyclic structure were efficiently synthesized in good yield starting from chloromethyl resin.

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An Efficient Synthesis of Cyclopeptides Bridged with Aliphafic-aryl Ether Bond

Zhe LIU, Gui Jei TIAN, De Xin WANG

中国化学快报. 2005, 16(06): 759-762.

摘要 ( )

可视化

Based on the pseudo-dilution effect (PDE) on solid support, three cyclopeptides with an aliphatic-aryl ether bond as the bridge were synthesized via S_N2 reaction between bromoacetylated at N-terminal and the phenol-OH group in C-terminal Tyr residue. All the products were obtained in good overall yields and characterized by related analytic data.

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Total Synthesis of (±)-Butyl Ester of Rosmarinic Acid

Long Jiang HUANG, De Quan YU

中国化学快报. 2005, 16(06): 763-766.

摘要 ( )

可视化

(±)-Butyl ester of rosmarinic acid 1 was synthesized by 5-step reactions through the two key intermediates 2 and 3, the total yield was 23.9% and 25.1%, respectively.

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A New Process for Synthesis of Dimethyl Carbonate from Ethylene Carbonate and Methanol without any Catalyst under Supercritical Conditions

Xiu Juan FENG, Xiao Gang LI, Ren HE, Hui ZHOU

中国化学快报. 2005, 16(06): 767-770.

摘要 ( )

可视化

Dimethyl carbonate was synthesized by transesterification reaction between ethylene carbonate and methanol under supercritical conditions without any catalyst. Experimental results showed that the residence time and the molar ratio of methanol to ethylene carbonate all can affect the conversion of ethylene carbonate. When the molar ratio of methanol to ethylene carbonate was 8:1, 81.2% conversion can be achieved at 9.0 MPa and 250℃ after 8 h.

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A New Bisxanthone from Hypericum japonicum Thunb. Ex Murray

Peng FU, Wei Dong ZHANG, Ting Zhao LI, Run Hui LIU, Hui Liang LI, Wei ZHANG, Hai Sheng CHEN

中国化学快报. 2005, 16(06): 771-773.

摘要 ( )

可视化

A new bisxanthone, named bijaponicaxanthone C, was isolated from the whole plant of Hypericum japonicum. The structure was elucidated as 6-[1",5",6"-trihydroxy-2"'-(β-hydroxy-β-methylethyl)-2"',3"'-dihydrofuran(5"',4"',3 ",4")xanthone-3"'-oxyl]-1,3,5-trihydroxy-4-isoprenylxanthone (1) on the basis of the spectral and chemical evidences.

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Two Novel Epimeric Eremophilane Sesquiterpenes from the Flower of Cacalia tangutica

Xia LIU, Yan Ping SHI

中国化学快报. 2005, 16(06): 774-776.

摘要 ( )

可视化

Two novel epimeric eremophilane sesquiterpenes, 7β-H-3α-angeloyl-9(10)-ene-11,12-epoxy-8-oxoeremophilane (1) and 7β-H-3α-angeloyl-9(10)-ene-11, 12-epoxy-8-oxoeremophilane (2) were isolated from the methanol extract of the flower of Cacalia tangutica (Franch.)Hand-Mazz. Their structures were characterized by 1D-, 2D-NMR (¹H-¹H COSY, HMQC,HMBC, ¹H-¹H NOESY) and HRESI-MS techniques.

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A New Halogenated Biindole and A New Apo-carotenone from Green Alga Chaetomorpha basiretorsa Setchell

Da Yong SHI, Li Jun HAN, Jie SUN, Shuai LI, Su Juan WANG, Yong Chun YANG, Xiao FAN, Jian Gong SHI

中国化学快报. 2005, 16(06): 777-780.

摘要 ( )

可视化

A new halogenated biindole and a new apo-carotenone have been isolated from the ethanolic extract of the green alga Chaetomorpha basiretorsa Sethcell. On the basis of chemical and spectroscopic methods including 2D NMR technique, their structures have been elucidated as 4,4'-dichloro-5,5'-dibromo-7,7'-dimethoxy-2,2'-bi-1H-indole and l'S^*,4'R^*-8-(4'-hydroxy-2',6',6'-trimethylcyclohex-2-enyl)-6-methyloct-3E,5E,7E-trien-2-one, respectively.

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A New Neolignan Glycoside from Pedicularis armata

Cheng Shan YUAN, Zhan Xin ZHANG, Xue GAO, Zhong Jian JIA

中国化学快报. 2005, 16(06): 781-782.

摘要 ( )

可视化

A new neolignan glycoside named armaoside (1) was isolated from the whole plant of Pedicularis armata Maxim. Its structure was elucidated by spectroscopic and chemical methods.Antibacterial assay showed that it has moderately antibacterial activities against Eschecichia coli,Bacillus subtilis and Staphylococcus aureus.

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A Novel Fortunate A from Cryptomerica fortunei

Zong Ping ZHENG, Li Hong HU, Jing Yu LIANG

中国化学快报. 2005, 16(06): 783-785.

摘要 ( )

可视化

A novel compound, named fortunate A, was isolated from the ethanol extract of the stem bark of Cryptomerica fortunei. Its structure was established on the basis of the spectral evidences including 1D and 2D NMR spectrum.

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A New Diterpene from Suregada glomerulate(Blume) Baill

Su Li HE, Ruo Yun CHEN

中国化学快报. 2005, 16(06): 786-788.

摘要 ( )

可视化

A new diterpene with an abietane skeleton, 3β-hydroxy-8α, 14α-epoxyabieta-11,13(15)-dien-16,12-olide, was isolated from the root of Suregada glomerulate(Blume) Baill. Its structure was elucidated on the basis of spectroscopic and X-ray crystallographic analysis.

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Synthesis and Chromatographic Properties of New β-Cyclodextrin Derivatives with α-Schiff Base Groups for HPLC

Min FANG, Zhi Ming ZHOU, Ai Qin LUO

中国化学快报. 2005, 16(06): 789-792.

摘要 ( )

可视化

β-Cyclodextrin 1 was directly oxidized to the corresponding monoaldehyde 2 on their primary faces by cyclized 2-iodoxybenzoic acid(IBX) in DMSO, followed by the synthesis of β-cyclodextrin derivatives bearing Schiff-base group 3. A new chiral stationary phase(BCDS 6)was then prepared by immobilization of β-cyclodextrin derivative with α-Schiff base group onto the surface of sillica gel. A series of compounds with amino groups were readily separated using this CSP. Methanol and acetonitrile were tested as the mobile phase while the influence of temperature and the addition of aqueous triethylammonium acetate buffer to the mobile phase was also innvestigated. Ferrocene ligand with Schiff-based groups have been separated satisfactorilly on BCDS column.

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A New Immunoassay Method by Capillary Electrophoresis with Enhanced Chemiluminescence Detection

Jiao Ning WANG, Ji Cun REN

中国化学快报. 2005, 16(06): 793-796.

摘要 ( )

可视化

This paper described a new immunoassay method by capillary electrophoresis with enhanced chemiluminescence (CL) detection system based on luminol-hydrogen peroxide reaction catalyzed by horseradish peroxides (HRP). Using para-iodophenol as a CL enhancer, the detection limit of about 1×10^-12 mol/L for HRP was achieved, which corresponded to 1.32×10^-5 U/mL. In optimal conditions, the free HRP-labeled CA125 antibody (Ab^*) and the bound enzyme-labeled complex (Ab^*-Ag) were well separated by capillary electrophoresis within 4 min.The assay was successfully used to determine the contents of CA125 in human sera, which were associated with ovarian cancer, and the recoveries of the standard addition experiments were 96 to 109%.

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Recognition Interactions of Metal-complexing Imprinted Polymer

Ying LIU, Guo Sheng DING, Jun De WANG

中国化学快报. 2005, 16(06): 797-800.

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可视化

Molecularly imprinted polymer, exhibiting considerable enantioselectivity for L-mandelic acid, was prepared using metal coordination-chelation interaction. By evaluating the recognition characteristics in the chromatographic mode, the recognition interactions were proposed:specific and nonspecific metal coordination-chelation interaction and hydrophobic interaction were responsible for substrate binding on metal-complexing imprinted polymer; while the selective recognition only came from specific metal coordination-chelation interaction and specific hydrophobic interaction.

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Application of Phenyl Bonded Mesoporous Silica as A Novel Coating Layer of Solid-phase Microextraction for Determination of Benzo[a]pyrene in Water Samples

Xin Zhen DU, Ya Rong WANG, Qian MA, Xue Feng MAO, Jin Guo HOU

中国化学快报. 2005, 16(06): 801-804.

摘要 ( )

可视化

Phenyl bonded mesoporous silica (C₆H₅-MCM-41) was applied as the fiber coating of solid-phase microextraction (SPME). The performance of the fiber coating was discussed coupling to HPLC. Applicability of mesoporous fiber coating was examined for the determination of benzo[a]pyrene (B[a]P) in water samples, The limit of detection (LOD) is 0.28 μg·L^-1. Good recovery and relative standard deviation (RSD) were obtained.

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Electrochemical Studies on the Interactions of Dipyridophenazine Complex of Ruthenium and Herring Sperm DNA

Li Ping JIANG, Wei LIU, Ling Yan JIANG, Guang Han LU

中国化学快报. 2005, 16(06): 805-808.

摘要 ( )

可视化

Cyclic voltammetry (CV) and single-step chronocoulometry were used to study the interaction of [Ru(phen)₂dppz]²⁺ (phen=l,10-phenanthroline; dppz=dipyrido[3,2-a:2',3',-c]phen-azine) with herring sperm DNA. The addition of DNA caused a diminution in the peak current and a positive shift in the peak potential of the complex of [Ru(phen)₂dppz]²⁺. The 12 mV positive shift in the peak potentid of [Ru(phen)₂dppz]²⁺ indicates that [Ru(phen)₂dppz]²⁺ binds 2.6 times more strongly to DNA than its reductive form. In addition, by using fluorimetric and UV-spectrophotometric methods and studies of denatured DNA and the effect of NaCl solution, it was also found that the binding mode was intercalation. The decrease of peak current is proportional to the concentration of DNA, which can be applied to estimate DNA concentration.

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Electroosmotic Driving Liquid Using Nanosilica Packed Column

Ling Xin CHEN, Guo An LUO, Tao WEN

中国化学快报. 2005, 16(06): 809-811.

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可视化

The electroosmotic pump (EOP) using nanosilica particles packed-bed column was experimentally studied. The relationship between flowrate, pressure and applied voltage of the pump, and pressure-flowrate (P-Q) characteristic were investigated.

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Characterization of Galactosyl-neoglycoalbumin¹ by MALDI-TOF-MS

Chun CAI, Yong WU

中国化学快报. 2005, 16(06): 812-814.

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可视化

Matrix assisted laser desorption ionization time of flight mass spectrometry(MALDI-TOF-MS, model AXIMA CFR+) was used to analyze galactosyl-HSA (human serum albumin) synthesized in our laboratory. It clearly showed that HSA covalently combined with galactoses. Galactosyl-HSA is pure and the ratio of galactosyl residues to protein is 48:1.

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Microdetermination of Residual Protein in Penicillin by Resonance Light Scattering Technique with m-Nitrophenylfluorone-Mo(Ⅵ) Complex

Qin WEI, Dan WU, Yan LI, Jun Hong WANG, Yan LIU, Bin DU

中国化学快报. 2005, 16(06): 815-818.

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可视化

Based on the enhancement of resonance light scattering (RLS) of m-nitrophenylfluorone-Mo(Ⅵ) complex by protein, a novel method for protein microdetermination in Tween 20 microemulsion has been developed. Under optimum condition, the linear ranges of bovine serum albumin are 0~0.03 μg·mL^-1 with detection limits of 3.10 ng·mL^-1. Most of amino acids and metal ions do not interfere. The method can be applied to determination of residual protein in penicillin Na salt and penicillin G potassium salt samples with satisfactory results.

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Activity Regulation of Lignin Peroxidase from Phanerochaete chrysosporium in Nonionic Reversed Micellar Medium

Dan WANG, Xi Rong HUANG, Cai Xia LIU, Yue Zhong LI, Yin Bo QU, Pei Ji GAO

中国化学快报. 2005, 16(06): 819-822.

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可视化

The activity of lignin peroxidase (LiP) in reversed micelles of polyoxyethylene lauryl ether (Brij30) changed with the molar ratio of water to the surfactant and the denaturant concentration of guanidinium chloride. At low water contents the activity of LiP could be enhanced by the denaturant at moderate concentration. This phenomenon, together with the spectral characteristics of the intrinsic fluorescence of LiP, suggested that the conformation of the active center of LiP was flexible.

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The Aqueous Dispersions of Bicontinuous Cubic Phases Formed by Precursor Method

Jin ZHANG, Dong Hua LI, Li Qiang ZHENG

中国化学快报. 2005, 16(06): 823-826.

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可视化

The morphologies and the microstructures of the dispersed particles of the cubic phase,which were formed by precursor method, were studied. The freeze-fracture TEM clearly showed that the aqueous dispersed particles have irregular cubic shapes. X-ray diffraction technique has been utilized to study the microstructure of the particles and it was found that these particles still retained the cubic character. The sizes of the particles were measured by dynamic light scattering,and the results showed that the sizes of the dispersed particles were between 200~400 nm under different conditions.

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Photostability Study of Nanoporous TiO₂ Film Electrodes in Basic Solutions

Jiang Lin CAO, Wen Hua LENG, Jian Qing ZHANG, Chu Nan CAO

中国化学快报. 2005, 16(06): 827-830.

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可视化

The nanoporous TiO₂ film electrodes have been prepared by a sol-gel deposition process.The photostability of the electrodes in basic solutions has been studied. The results show that the photostability of the electrodes decreases rapidly in strong basic solutions with or without methanol. The reaction of holes to O_ad^2- produces active O_ad^- atoms and the products O_ad^- atoms oxidize Ti³⁺ to Ti⁴⁺ on TiO₂ film surface and subsurface. This results in the TiO₂ film electrodes unstable in basic solutions both without methanol and with too low concentration.

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A New Kind of Void Soap-free P(MMA-EA-MAA) Latex Particles

Kai KANG, Cheng You KAN, Yi DU, Yu Zhong LI, De Shan LIU

中国化学快报. 2005, 16(06): 831-834.

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可视化

Soap-free P(MMA-EA-MAA) particles with narrow size distribution were synthesized by seeded emulsion polymerization of methyl methacrylate (MMA), ethyl acrylate (EA) and methacrylic acid (MAA), and large voids inside the particles were generated by alkali posttreatment in the presence of 2-butanone. Results indicated that the size of void and the particle volume were related with the amount of 2-butanone. The generation mechanism of voids was proposed.

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Formation and Aggregation Kinetics of Mixed Metal Hydroxides Agglomerates

Zhi Lin JIN, Wan Guo HOU, Xue Wei LI, De Jun SUN, Chun Guang ZHANG

中国化学快报. 2005, 16(06): 835-838.

摘要 ( )

可视化

The aggregation and fractal structure of mixed metal hydroxides (MMH) agglomerates with increasing ionic strength have been studied by dynamic light scattering (DLS) and SEM techniques. The experiments indicate that the MMH agglomerates have two different structures in RLA regime and DLA regime, and also give the proof that the transition region between RLA and DLA may occur.

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Plasma-catalytic Selective Reduction of NO with C₂H₄ in the Presence of Excess Oxygen

Qi SUN, Ai Min ZHU, Xue Feng YANG, Jin Hai NIU, Yong XU, Zhi Min SONG, Jing LIU

中国化学快报. 2005, 16(06): 839-842.

摘要 ( )

可视化

This paper reports observations of significant synergistic effects between dielectric barrier discharge (DBD) plasmas and Cu-ZSM-5 catalysts for C₂H₄ selective reduction of NO_x at 250℃ in the presence of excess oxygen by using a one-stage plasma-over-catalyst (POC) reactor.With the reactant gas mixture of 530 ppm NO, 650 ppm C₂H₄, 5.8% O₂ in N₂ and GHSV=12000 h^-1, the pure catalytic, pure plasma-induced (discharges over fused silica pellets) and plasmacatalytic (in the POC reactor) NO_x conversion are 39%, 1.5% and 79%, respectively. The in-situ optical emission spectra of the reactive systems imply some short-lived active species formed from plasma-induced and plasma-catalytic processes may be responsible to the observed synergistic effects in this one-stage POC system.

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A Novel Method for the Synthesis of Mesoporous Molecular Sieve MCM-41

Xiu Mei TAI, Hong Xia WANG, Xiu Qi SHI

中国化学快报. 2005, 16(06): 843-845.

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可视化

Using glycerol, glycol and water as solvent, cetyltrimethylammonium bromide (CTAB)as template, tetraethyl orthosilicate (TEOS) as silica source, ethylenediamine (EDA) as base source,mesoporous molecular sieve MCM-41 has been synthesized at room temperature, characterized by X-ray power diffraction and N₂ adsorption. Compared with the samples synthesized by glycol and water, the samples synthesized by glycerol have larger pore diameter and high surface areas.Thus glycerol is an efficient solvent for preparing larger pore mesoporous MCM-41.

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Oxidation of Alcohols Catalyzed by Ruthenium Complexes with Iodosylbenzene as Oxidant

Zi Qiang LEI, Qiao Xiang KANG, Xiang Zhen BAI, Zhi Wang YANG, Qing Hua ZHANG

中国化学快报. 2005, 16(06): 846-848.

摘要 ( )

可视化

Five ruthenium complexes such as Phen-Ru-Phen, Phen-Ru-Bipy, Phen-Ru-Quin,Quin-Ru-Quin and Bipy-Ru-Quin (where Phen=1, 10-phenanthroline, Quin=8-hydroxyquinoline,Bipy=2, 2'-bipyridine) were synthesized and used as catalysts for the oxidation of benzylic and primary aliphatic alcohols with iodosylbenzene as oxidant. The oxidations were carried out at room temperature, affording the corresponding aldehydes and ketones with high selectivity.

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Flow Field Induced Steady Alignment of Oxidized Multi-walled Carbon Nanotubes

Ai Zhong XU, Ming Shu YANG, Qiang WU, Xiao Ming HU, Lei JIANG

中国化学快报. 2005, 16(06): 849-852.

摘要 ( )

可视化

The steady ordered micro-ribbons of oxidized multi-walled carbon nanotubes (MWNTs)were obtained through micro-aperture PTFE membrane by vacuum filtration. After treatment by mixture of concentrated nitric acid and sulfuric acid, the surface functional groups modified MWNTs can be easily dispersed to form a homogeneous suspension. It is found that the steady micro-ribbons existed in the films obtained by vacuum filtration of the suspension. The filtration formed steady flow field and induced steady alignment of oxidized MWNTs. The chemical treatment of MWNTs forming strong interaction between MWNTs is necessity to keep steady of the micro-ribbons microstructure.

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2005年, 第16卷, 第06期　刊出日期：2005-06-20

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2005年, 第16卷, 第06期 刊出日期：2005-06-20

2005年, 第16卷, 第06期　刊出日期：2005-06-20