中国化学快报

Select

The Reactivity of 2,4,6-Tirphenylpyridinium Ylids

中国化学快报. 2003, 14(02): 111-114.

摘要 ( )

可视化

Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction-carbanion addition products, respectively.The reaction with chloroform was determined as pseudo first order from kinetic experiments.The values of k_obsd and t_1/2 for decarboxylation at 20, 40 and 50℃ were calculated to be 4.6×10^-4, 8.8×10^-3, 2.8×10^-2min^-1 and 1.5×10³, 78, 24 minutes, respectively.

Select

Studies of the Total Synthesis of Epothilone B and D:A Facile Synthesis of C7-C14 and C15-C21 Fragments

中国化学快报. 2003, 14(02): 115-117.

摘要 ( )

可视化

A mild and highly efficient synthesis of C7-C14 and C15-C21 fragments of epothilone B and D is described in which racemic C7-C14 fragment is prepared from nerol through four steps, and C15-C21 fragment is obtained from 1, 3-dichloroacetone, thioacetamide and propionaldehyde.

Select

New Disperse Dyes for Polyester Microfibres

中国化学快报. 2003, 14(02): 118-120.

摘要 ( )

可视化

A series of disperse dyes bearing ether groups have been synthesized.The visible absorption spectra of them were studied, their fastness on polyester microfibres were investigated.

Select

A Green Synthesis of Diisopropyl Phosphoryl Amino Acid

Xiao Bin SUN, Yu Ping FENG, Xiang Feng GUO, Yu Fen ZHAO

中国化学快报. 2003, 14(02): 121-124.

摘要 ( )

可视化

In this paper, we report that diisopropyl phosphoryl amino acid could be prepared with reasonable yields under solvent-free condition by adding amino acid to the mixture of diisopropyl phosphite and N-chlorodiisopropylamine.

Select

Synthesis of New Chiral C₂-Symmetrical Bis(oxazoline) Compounds

Chun Hua ZHANG, Nian Fa YANG, Li Wen YANG

中国化学快报. 2003, 14(02): 125-126.

摘要 ( )

可视化

New chiral C₂-symmetrical bis(oxazoline) compounds bearing one isobutyl-, secbutyl-, benzyl- or isopropyl-substituent at the 4-position have been prepared and characterized.

Select

Stereoselective Synthesis of (±) Neocnidilide

Xiao Zhen JIAO, Ping XIE, Lian Suo ZU, Xiao Tian LIANG

中国化学快报. 2003, 14(02): 127-129.

摘要 ( )

可视化

The racemic neocnidilide has been synthesized by stereoselective reaction of hemiacetal 5 with n-BuMgBr.

Select

Stereoselective Synthesis of syn-and anti-3a-Hydroxyl-1, 2, 3, 3a, 8, 8a-hexahydropyrrolo[2,3-b] indole-2-carboxylic Acid

Xiao Yin YANG, Christian HAUG, Yi Ping YANG, Zhi Sheng HE, Yang YE

中国化学快报. 2003, 14(02): 130-132.

摘要 ( )

可视化

The structure of syn- and anti-N^b-(p-toluenesulfonyl)-3a-hydroxyl-1, 2, 3, 3a, 8, 8a-hexahydro pyrrolo[2,3-b] indole-2-carboxylic t-butyl ester was stereoselectively synthesized by oxidative ring formation of N^b-(p-toluenesulfonyl)-L-tryptophan t-butyl ester in methylene chloride containing dimethyldioxirane (DMDO), the p-toluenesulfonyl group and t-butyl group can be easily removed by sodium naphthalenide and trifluoroacetic acid, respectively.

Select

An Abnormal Reaction of N-(2,4-dinitrophenyl)-L-proline with Thionyl Chloride

Zhi Bin XU, Zong Ru GUO

中国化学快报. 2003, 14(02): 133-134.

摘要 ( )

可视化

N-(2,4-Dinitrophenyl)-4-amino-n-butyl aldehyde 3 was obtained with high yield of 80% when N-(2,4-dinitrophenyl)-L-proline 1 reacted with SOCl₂ at room temperature.However, the anticipated product N-(2,4-dinitrophenyl)-tetrahydropyrrolyl-2-(4-methylthiophenyl) ketone 2 did not be produced.The mechanism was discussed in this article.

Select

Studies on the Displacement Reaction of Trialkylaluminum with Ethylene Catalyzed by Nitrogen Chelate Cobalt Complexes

Bin ZHOU, Ren HE

中国化学快报. 2003, 14(02): 135-137.

摘要 ( )

可视化

The catalytic properties of a scries of cobalt complexes containing bidenated ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature and cobalt complexes containing different ligand on catalyst performance has been investigated.

Select

Synthesis and Characterization of Chiral Organogallium and Indium Complexes with Salen Ligands

Fu Xing GAO, Cheng Jian ZHU, Fang YUAN, Yu Hua ZHU, Yi PAN

中国化学快报. 2003, 14(02): 138-140.

摘要 ( )

可视化

Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, ¹H NMR and Mass spectroscopy.For the gallium, mono and bimetallic complexes were obtained, whereas ring closure complexes of indium were obtained.

Select

Controlled/"Living" Radical Polymerization of (-)-Menthyl Methacrylate

Yong An XU, Hong XUE, Jin Ying DING, Lian Xun GAO, Meng Xian DING

中国化学快报. 2003, 14(02): 141-142.

摘要 ( )

可视化

The atom transfer radical polymerization(ATRP) of (-)-menthyl methacrylate((-)-MnMA) mediated by CuCl/bipyridine and ethyl 2-bromopropionate or 1-phenylethyl bromide in THF system has been studied.The dependence of the specific rotation on molecular weight and the CD of Poly((-)-MnMA) thus obtained was investigated.

Select

Phosphate Doubly Capped Tetrahomodioxacalix[6]arene

Hai Bing LI, Yuan Yin CHEN

中国化学快报. 2003, 14(02): 143-144.

摘要 ( )

可视化

A bisphosphate-bridged tetrahomodioxacalix[6]arene with a C_2v symmetry at the ambient temperature was obtained by the reaction of tetrahomodioxacalix[6]arene with POCl₃.

Select

Synthesis and Characterization of a Novel Copoly(aryl ether ketone) Containing 4, 4'-Biphenyl-bis[4-phthalazin-1(2H)-one] Moiety

Shao Yin ZHANG, Xi Gao JIAN, Shu De XIAO, Jin Yan WANG, Jie ZHANG

中国化学快报. 2003, 14(02): 145-146.

摘要 ( )

可视化

A new monomer of 4, 4'-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4'-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4'- difluorodiphenylketone (DFK).The monomer and copolymer were characterized by FT-IR and ¹H-NMR.DSC and TGA were used to the novel polymer.

Select

Preparation of the N,19-seco Norditerpenoid Alkaloids from Norditerpenoid Alkaloid Yunaconitine

Qiao Hong CHEN, Liang XU, Feng Peng WANG

中国化学快报. 2003, 14(02): 147-150.

摘要 ( )

可视化

The synthesis of a new N,19-seco norditerpenoid alkaloid 7 bearing nitro group from yunaconitine 1 as the starting material through a series of steps was described.

Select

Synthesis and Characterization of a Novel Acrylonitrile Copolymer Containing Glucose Pendants

Dong Mei GUO, Rui Qiang KOU, Zhi Kang XU

中国化学快报. 2003, 14(02): 151-154.

摘要 ( )

可视化

In this work, a novel sugar-containing copolymer was synthesized by the copolymerization of α-allyl glucoside (AG) with acrylonitrile (AN).The copolymers were characterized by NMR spectroscopy.It was found that acrylonitrile-based copolymers containing as high as 22wt.% of α-allyl glucoside can be synthesized by the free radical solution copolymerization of the two monomers in DMSO with AIBN as initiator.

Select

Structural Study of Inclusion Complex of Andrographolide with β-Cyclodextrin Prepared under Microwave Irradiation

Dong Yu ZHAO, Sheng Hua YANG, Ming HU, Xue Yi MA

中国化学快报. 2003, 14(02): 155-158.

摘要 ( )

可视化

An inclusion complex of β-cyclodextrin with andrographolide (Andro) was prepared by using a convenient method of microwave irradiation.The structure of the inclusion complex was determined by the ¹H NMR, 2D NMR spectroscopy as well as the elemental analysis.

Select

The Electron Transfer Reaction between p-Nitrobenzoates and β-N, N-Dimethylaminonaphthalene

Yong Hui WANG, Man Zhou ZHU, Tao LIU, Qing Xiang GUO

中国化学快报. 2003, 14(02): 159-162.

摘要 ( )

可视化

A few of p-nitrobenzoates were synthesized, and the electron transfer of them with β-N, N-dimethylaminonaphthalene (DMAN) in methanol solution was studied.Steady-state fluore-scence results showed the cyclodextrin moiety in p-nitrobenzoyl-β-cyclodextrin would block the electron transfer pathway from DMAN compared with other electron acceptors, thus, reduced the electron transfer efficiency

Select

Enzyme-catalyzed Transesterification of Unusual Substrate:Synthesis of Acyclovir and L-ascorbic Acid (Vitamin C) Vinyl Esters

Xing Tao XUE, De Shui Lü Zhi Chun CHEN, Qi WU, Ying CAI, Xian Fu LIN

中国化学快报. 2003, 14(02): 163-166.

摘要 ( )

可视化

The synthesis of acyclovir and L-ascorbic acid with divinyladipate was performed with alkaline protease from Bacillus subtilis and lipase from Lipozyme (immobilized from Mucor miehei) in different anhydrous organic solvents.Two corresponding derivatives were obtained.

Select

Enzymatic Synthesis of a CCK-8 Tripeptide Derivative

Li GUO, Zi Min LU, Heiner ECKSTEIN

中国化学快报. 2003, 14(02): 167-168.

摘要 ( )

可视化

The enzymatic synthesis of CCK-8 tripeptide derivative Phac-Met-Asp(OMe)-Phe-NH₂ is reported.Starting with Phac-Met-OCam, we have successfully synthesized the target tripeptide with three free or immobilized enzymes, α-chymotrypsin, papain and thermolysin in reasonable yields.The key steps in this synthesis were the coupling of Phac-Met-OCam and H-Asp(OMe)₂ to form Met-Asp peptide bond catalyzed by α-chymotrypsin and the selective hydrolysis of α-ester of Phac-Met-Asp(OMe)₂ catalyzed by papain.

Select

Two New Compounds from Hemsleya penxianensis var.gulinensis

Yu Ping LIN, Ming Hua CHIU, Zhong Rong LI

中国化学快报. 2003, 14(02): 169-172.

摘要 ( )

可视化

Two new compounds, oleanolic acid 28-O-β-D-glucopyranosyl-3-O-α-L-arabinopyrano- syl-(1→3)-(6'-butyl ester)-β-D-glucuropyranoside 1, oleanolic acid 28-O-β-D-glucopyranosyl- (1→6)-β-D-glucopyranoside 2 have been isolated from the roots of Hemsleya penxianensis var.Gulinensis.Their structures were determined on the bases of the spectral and chemical evidences.

Select

A Novel Alkaloid from Stemona parviflora

Chang Qiang KE, Zhi Sheng HE, Yi Ping YANG, Yang YE

中国化学快报. 2003, 14(02): 173-175.

摘要 ( )

可视化

A novel alkaloid was isolated from the stems and leaves of Stemona parviflora Wright.Based on the spectral methods, its structure was elucidated as parvineostemonine.

Select

A New Steroid from Polygonum nodosum Pers

Shang Zhen ZHENG, Tong SHEN, Xu Wei SHEN, Zhong Jian JIA

中国化学快报. 2003, 14(02): 176-178.

摘要 ( )

可视化

A new steroid named as Zhonghualiaoine I (1) was isolated from Polygonum nodosum Pers (Chinese name "Zhonghualiao", Berberidaceae).Its structure was deduced on the basis of its spectral data.

Select

A New Antimicrobial Flavonol Glycoside from Alchornea davidii

Gui You CUI, Jun Yan LIU, Ren Xiang TAN

中国化学快报. 2003, 14(02): 179-180.

摘要 ( )

可视化

A new flavonol glycoside, isorhamnetin-3-O-β-D-xyloside, was isolated from the extract of leaves and twigs of Alchornea davidii (Euphorbiaceae).Its structure was established on the basis of the spectral analysis and chemical degradation.Antimicrobial assay showed that it moderately inhibited the growth of test bacteria (Staphylococcus aureus, Bacillus subtilis and Pseudomonas fluorescens) and fungi (Candida albicans, Aspergillus niger and Trichophyton rubrum) with MICs at 50 μg/Ml.

Select

A Novel Approach to Improve the Detectability of CO₂ by GC Analysis

Wei Min GUO, Yu An SUN, Xiao Jing WU, Wen Sheng CAI, Xue Guang SHAO, Zhong Xiao PAN

中国化学快报. 2003, 14(02): 181-184.

摘要 ( )

可视化

A novel stochastic resonance algorithm was employed to enhance the signal-to-noise ratio (SNR) of signals of analytical chemistry.By using a gas chromatographic data set, it was proven that the SNR was greatly improved and the quantitative relationship between concentrations and chromatographic responses remained simultaneously.The linear range was extended beyond the instrumental detection limit.

Select

A Capillary Electrophoresis Detection Scheme for Water-soluble Vitamins Based on Luminol-BrO^- Chemiluminescence System

Wei DENG, Wei Ping YANG, Zhu Jun ZHANG, Hou Jiang ZHOU

中国化学快报. 2003, 14(02): 185-187.

摘要 ( )

可视化

A novel chemiluminescence detection scheme has been developed for detecting water-soluble vitamins following capillary electrophoresis (CE) separation.This detection was based on the inhibitory effect of vitamins on the CL reaction between luminol and BrO^- in basic aqueous solution.Detection of vitamins was accomplished with a borate-based background electrolyte at pH 9.2.The luminol was used as a component of the separation carrier electrolyte.

Select

Polymeric Structure and Solid ³¹P,¹¹³Cd NMR Spectra of Cadmium(Ⅱ) Dialkyldithiophosphate(Alkyl=n-butyl and i-butyl)

Ye Gao YIN, Willis FORSLING, Dan BOSTRÖM, Oleg ANTZUTKIN, Mats LINDBERG, Alexander IVANOV

中国化学快报. 2003, 14(02): 188-190.

摘要 ( )

可视化

Two polymeric complexes,[Cd(BTP)₂]_n,1 and [Cd(i-BTP)₂]_n 2 ,were prepared and invesigted by solid ³¹P and ¹¹³Cd NMR spectroscopies.The crystal structure of 2 was determined by X-ray diffraction.

Select

On-line Separation and Detection of Peptides by Capillary Electrophoresis/Electrospray FT-ICR-MS

Bin XIN, Dan PU, Shao Xiang XIONG, Guang Hui WANG

中国化学快报. 2003, 14(02): 191-194.

摘要 ( )

可视化

The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)was presented for the on-line separation and detection of mixture of peptides.With the ultra-high resolution and unmatchable mass measurement accuacy FT-ICR-MS provides,the separation and identification of angiotensin Ⅲ,octreotide and elastin chemotactic were successfully achieved using this fabricated device,which showed its great application potential in detection and structural identification for multicomponent sample.

Select

Study on the Enhancement of Proton Affinity by N-Diisopropyloxy Phosphorylation of Amino Acid in Mass Spectrometry

Hai LIU, Jing CHEN, Yang JIANG, Yu Fen ZHAO

中国化学快报. 2003, 14(02): 195-196.

摘要 ( )

可视化

With introduction of a diisopropyloxy phosphoryl group into the N terminal of amino acids, it was found that proton affinity (PA) of amino acid was enhanced in mass spectrometry.Density functional theory calculations showed that the energy for protonation of DIPP-amino acid is lower than that of amino acid, which means PA of DIPP-AA is higher than that of corresponding amino acid.These results, coincident with our empirical results, offer a useful interpretation of experimental observations.

Select

Synthesis of New Solid Solutions on Neodymium-stabilized La₂Mo₂O₉

Qi Bing BO, Jing FENG, Hong Yan WANG, Jian MENG

中国化学快报. 2003, 14(02): 197-200.

摘要 ( )

可视化

A new ionic conductor La_2-xNd_xMo₂0₉，(x=0.0-2.0) has been synthesized by wet-chcmistry method. The precursors and the resultant oxide powders were characterized by DTA/IG, DSC, XRD and XPS techniques. Eflect ofsubslituting Nd for La reveals thal the phase transition which occurs in La₂Mo₂0₉ around 565℃ disappears when x>0.2. And The maximum amount of Nd stabilized the high temperature phase of β-La₂Mo₂O9 from cubic to tetragonal is about x=1.6.The measurements of impedance spectroscopy indicate that the ionic conductivity becomes considerably higher in comparison to that of La₂Mo2O₉.

Select

Structure of Oxygen and CO Adsorption on Ru(0001) Electrode

Wei Bo WANG, Kai LIU, Mau Scheng ZEI

中国化学快报. 2003, 14(02): 201-204.

摘要 ( )

可视化

Electrosorption of oxygen and CO on Ru(0001) surface were investigated by ex-situ electron diffraction (LEED/RHEED), AES and electrochemical data.The Ru(0001) surface exhibited a strongly affinity for oxygen which gave preference to form a (2×2)-O phase.However, anodization of Ru(0001) electrode produced a (1×1)-O phase.A coadsorption structure (2CO+O)(2×2)/Ru(0001) was performed from electrosorption of CO on Ru(0001) surface in electrolyte solution.

Select

Sonochemical Degradation of Polychlorinated Biphenyls in Aqueous Solution

Xi Kui WANG, Guan Hong CHEN, Zhong Yan YAO

中国化学快报. 2003, 14(02): 205-208.

摘要 ( )

可视化

Polychlorinated biphenyl (PCB) is a kind of persistent and dangerous environmental pollutants.This paper presented the research result of sonochemical degradation of 2-chloro- biphenyl (2-CBP), 4-chlorobiphenyl (4-CBP) and 4,4'-dichlorobiphenyl (4,4'-CBP)in water.The ultrasonic degradation kinetics of 2-CBP, 4-CBP and 4,4'-CBP in water were found to be first-order and the degradation rate coefficients are 3.69×10^-2, 3.19×10^-2 and 2.06×10^-2 at 25±1℃ for 2-CBP, 4-CBP and 4,4'-CBP respectively.The influence of initial concentrations, reaction temperature on the ultrasonic decomposition of 2-CBP were also investigated.

Select

A DFT Study on Intramolecular Hydrogen Bond in Substituted Catechols and Their Radicals

Hong Yu ZHANG, You Min SUN, Lan Fen WANG

中国化学快报. 2003, 14(02): 209-212.

摘要 ( )

可视化

Density functional theory (DFT) at B3LYP/6-31G(d,p) level was employed to calculate intramolecular hydrogen bond enthalpies (H_IHB), O-H charge differences, O-H bond lengths and bond orders for various substituted catechols and their radicals generated after H-abstraction.It was found that although the charge difference between hydrogen-bonded H and O played a role in determining H_IHB, H_IHB was mainly governed by the hydrogen bond length.As the oxygen-centered radical has great tendency to form a chemical bond with the H atom, hydrogen bond lengths in catecholic radicals are systematically shorter than those in catechols.Hence, the H_IHB for the former are higher than those for the latter.

Select

Molecular Simulation study of Alkyl Monolayers on Si(Ⅲ) Surface

Shi Ling YUAN, Zheng Ting CAI, Li XIAO

中国化学快报. 2003, 14(02): 213-216.

摘要 ( )

可视化

The structure of eight-carbon monolayers on the H-terminated Si(Ⅲ) surface was investigated by molecular simulation method.The best substitution percent 50% for octene or octyne-derived monolayer can be obtained using molecular mechanics calculation.And the densely packed, well-ordered monolayer on Si(Ⅲ) surface can be shown through energy minimization in the suitable-size simulation cell.

Select

Computer Simulation of Gd(Ⅲ) Speciation in Human Interstitial Fluid

Jin Ping WANG, Hai Yuan ZHANG, Chun Ji NIU, Jia Zuan NI

中国化学快报. 2003, 14(02): 217-218.

摘要 ( )

可视化

The speciation and distribution of Gd(Ⅲ) in human interstitial fluid was studied by computer simulation.Meantime artificial neural network was applied to the estimation of log β values of complexes.The results show that the precipitate species, GdPO₄ and Gd₂(CO₃)₃, are the predominant species.Among soluble species, the free Gd(Ⅲ), [Gd(HSA)] , [Gd(Ox)] and then the ternary complexes of Gd(Ⅲ) with citrate are main species and [Gd₃(OH)₄] becomes the predominant species at the Gd(Ⅲ) total concentration of 2.2×10^-2mol/L.

Select

Off-on-off Luminescent Switching of a Novel Ru(Ⅱ) Complex

Bin DONG, Ke Zhi WANG, Lin Pei JIN, Li Hua GAO

中国化学快报. 2003, 14(02): 219-220.

摘要 ( )

可视化

UV-vis and luminescence spectroscopic titration experiments show that a novel Ru(Ⅱ) complex exhibits off-on-off pH luminescent switching with a maximum on-off ratio of about 100.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2003年, 第14卷, 第02期　刊出日期：2003-02-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2003年, 第14卷, 第02期 刊出日期：2003-02-20

2003年, 第14卷, 第02期　刊出日期：2003-02-20