中国化学快报

Select

The Sulfinatodehalogenation Reaction of α,α-Difluorobenzyl Halides with Sodium Dithionite

Jin Tao LIU, He Jun LU

中国化学快报. 2000, 11(03): 189-190.

摘要 ( )

可视化

The sulfinatodehalogenation reaction of α,α-difluorobenzyl halides,ArCF₂X (Ar=C₆F₅,C₆H₅; X=Br,I),with sodium dithionite took place readily in aqueous acetonitrile under mild conditions,giving the corresponding sodium sulfinate. The 1:1 adducts were obtained when alkenes were added to the reaction system in some cases.

Select

Tetrahydrofuran Ring Opening with Acyl Chlorides or Anhydrides Catalyzed by Gallium Triiodides:A Novel and Facile Method for the Preparation of Iodo Esters

Hua Yue WU, Ren Er CHEN, Yong Min ZHANG

中国化学快报. 2000, 11(03): 191-194.

摘要 ( )

可视化

Tetrahydrofuran ring can be opened with acyl chlorides or anhydrides catalyzed by gallium triiodides to afford iodo esters under mild conditions in good yields.

Select

Synthesis of β-aminoesters and α-selenoesters via Active Metal Bismuth Produced by Sm/BiCl₃ System in Aqueous Media

Yun Kui LIU, Yong Min ZHANG

中国化学快报. 2000, 11(03): 195-198.

摘要 ( )

可视化

Active metal bismuth is produced in situ via Sm/BiCl₃ system in aqueous media. Promoted by this active species,β-aminoesters and α-selenoesters are synthesized via reaction of α-bromoesters with 1-(a-aminoalkyl) benzotriazole and diselenides in moderate to good yields.

Select

Et₂AlCl-Mediated Reaction of α-4(20)-Epoxy-5α-hydroxy Taxinine B

Qian CHENG, Takayuki ORITANI, Tohru HORIGUCHI

中国化学快报. 2000, 11(03): 199-202.

摘要 ( )

可视化

An α-4(20)-epoxy-5α-hydroxytaxinine B 1,when treated with diethylaluminum chloride,underwent reactions involving intramolecular substitution along with deacetylation or addition leading to new rings. Two novel 1-deoxy compounds 2 and 3 were isolated and fully characterized.

Select

Novel Hydroperoxides of 1-Imino-3,3-Disubstituted-1,3-Dihydro Isobenzofuran

Wen Ge YAN, Bai Ling XU, Zong Ru GUO, Xiao Tian LIANG, Guang Zhong YANG

中国化学快报. 2000, 11(03): 203-206.

摘要 ( )

可视化

Some 1-imino-3,3-disubstituted-1,3-dihydro isobenzofuran and 2-(1,1-disubstituted hydroxymethyl) benzamide derivatives have been obtained by the aminolysis of phthalide in the presence of triethylamine/aluminum chloride. 1-Benzylimino-3,3-disubstituted-1,3-dihydro isobenzofuran can be peroxidized to the corresponding hydroperoxides on exposure to the air for a long period. The structure was characterized by single crystal X-ray diffraction and the possible mechanism was suggested.

Select

Synthesis of Pyrrole-Imidazole Polyamide

Jun Hua XIAO, Gu YUAN, Wei Qiang HUANG, Fei Li TANG, Albert S. C. CHAN, K. L. Daniel LEE

中国化学快报. 2000, 11(03): 207-208.

摘要 ( )

可视化

One simple and versatile method is established for the synthesis of DNA recognition molecules-polyamides containing alternating N-methylpyrrole and N-methylimidazole without necessitating NH_2^- group protection.

Select

An Improved and Efficient Preparation of the Chiral NAD(P)H Model (S_S)-1-Benzyl-3-(p-tolylsulfinyl)-1,4-dihydropyridine

Jing LI, You Cheng LIU, Jin Gen DENG

中国化学快报. 2000, 11(03): 209-211.

摘要 ( )

可视化

An improved procedure for the preparation of chiral NAD(P)H model,(S_S)-1-benzyl-3-(p-tolylsulfinyl)-1,4-dihydropyridine,with satisfactary chemical yield and excellent enantiopurity is reported.

Select

First Total Synthesis of Optically Active Oplopandiol Acetate, a Potent Antimycobacterial Polyyne Isolated from Oplopanax horridus

Liang XU, Xi Han WU, Guang Rong ZHENG, Jun Chao CAI

中国化学快报. 2000, 11(03): 213-216.

摘要 ( )

可视化

The first stereoselective total synthesis of oplopandiol acetate 1,a potent antimyco-bacterial polyyne isolated from Oplopanax horridus,is presented. And its absolute configuration is confirmed to be (11S,16S).

Select

An Improved Synthesis of the Natural Product Isorhapontigenin

Lian QIAN, Zhi Song PIAO, Lin WANG, Zhi Zhong ZHAO

中国化学快报. 2000, 11(03): 217-218.

摘要 ( )

可视化

We have developed an alternative route to synthesize the natural product,isorhapotogenin. The synthetic product was characterized by IR and ¹H-NMR in comparison with the corresponding natural product.

Select

Electron Transfer Reaction between M-C₆H₆ and M⁺-C₆H₆ Complexes in the Gas Phase:Density Functional Theory Study

Ai Ping FU, Dong Mei DU, Zheng Yu ZHOU

中国化学快报. 2000, 11(03): 219-222.

摘要 ( )

可视化

DFT/BLYP method is used to theoretically investigate the electron transfer (ET) reactions between M (Li,Na,Mg)-C₆H₆ and M⁺-C₆H₆ complexes in the gas phase. The geometry optimization of the precursor complexes and the transition state in the process of ET reaction was performed at 6-31G basis set level. The activation energy,the coupling matrix element and the rate constant of the ET reaction are calculated at semi-quantitative level.

Select

Cobalt-catalyzed Photochemical Methoxycarbonylation of Olefins with Carbon Dioxide under Ambient Conditions

Jing Mei YIN, Ming GUO, Rui WANG, Guang Yun ZHOU, Da Bin GAO, Xiang Sheng WANG, Xin Wen GUO, Jian Qin ZHUANG

中国化学快报. 2000, 11(03): 223-224.

摘要 ( )

可视化

The methoxycarbonylations of cyclohexene and 1-decene with CO₂ can take place under ambient conditions by catalysis of[Co]([Co]=Co(acac)₂,Co(OAc)₂,CoCl₂) in the presence of ultraviolet irradiation.

Select

Two Novel Poly-Oxygen Bipyridine Alkaloids from Speranskia tuberculata

Jian Gong SHI, Han Qing Wang, Min WANG, Guang Xiong ZHOU, Yong Chun YANG, Wen Yan HU

中国化学快报. 2000, 11(03): 225-228.

摘要 ( )

可视化

Two novel poly-oxygen bipyridine alkaloids,speranculatines A (1) and B (2) have been isolated from Speranskia tuberculata. Their structures were elucidated by spectroscopic methods including 2D NMR techniques and X-ray crystallographic analysis.

Select

Abietane Quinones from Rabdosia serra

Xiao CHEN, Feng Jie DENG, Ren An LIAO, Qing Lan XIE, Xiao Hua XU

中国化学快报. 2000, 11(03): 229-230.

摘要 ( )

可视化

A new abietane quinone diterpenoid was isolated,together with horminone,16-acetoxy-7-0-acetylhorminone,β-sitosterol,stigmasterol,ursolic acid and palmitic acid from the leaves of Rabdosia Serra (MAXIM) Hara. The new compound was elucidated as 16-acetoxy-7α-ethoxyroyleanone.

Select

Two New Iridoid Glucosides from Clerodendrum serratum

Hui YANG, Bei JIANG, Zhi NA, Yun Pin GUO, Han Dong SUN

中国化学快报. 2000, 11(03): 231-234.

摘要 ( )

可视化

Two new iridoid glucosides,serratoside A and serratoside B,were isolated from the aerial parts of Clerodendrum serratum var. amplexifolium Moldenke. Their structures were elucidated by spectral and chemical methods.

Select

A New Taxane Diterpenoid from the Seeds of Taxus yunnanensis

Qing Wen SHI, Takayuki ORITANI, Ding ZHAO

中国化学快报. 2000, 11(03): 235-238.

摘要 ( )

可视化

A new taxane diterpenoid with a rearranged 5/7/6-membered ring system was isolated from the seeds of the Chinese yew,Taxus yunnanensis. Its structure was established as 9α-acetoxy-5α-cinnamoyl-11(15→1)-abeotaxa-4(20),11-diene-10β,13α,15-triol on the basis of spectroscopic analysis. Its relative stereochemistry is proposed from the results of a NOESY experment.

Select

Muricatenol, a Linear Acetogenin from Annona muricata (Annonaceae)

De Yu LI, Jing Guang YU, Xiu Zhen LUO, Lan SUN, Shi Lin YANG

中国化学快报. 2000, 11(03): 239-242.

摘要 ( )

可视化

Muricatenol 1,a new acetogenin,has been isolated from the seeds of Annona muricata L.. Compound 1 is a C₃₇ acetogenin without any THF rings,with four hydroxyls and one double bond in the long aliphatic chain. The hydroxyls of 1 are located at C-4,C-10,C-18 and C-19,respectively. The vicinal diol at C-18/C-19 is threo-configuration,and the double bond at C-14/C-15 is cis-configuration.

Select

DSC Study on Brain Tubulin and the Effect of Cisplatin

Xiao Lei ZHOU, Yong YANG, Bao Huai WANG, Zhi Fen LI, Ai Xiao LIU, Lung Fei YEN

中国化学快报. 2000, 11(03): 243-246.

摘要 ( )

可视化

The thermal property of the polymerization of brain tubulin was studied by a high-sensitivity differential scanning calorimeter. The phenomenon that heat flows increased and decreased consistently and obviously was observed. This phenomenon was called heat flow oscillation. It was probably correlated to the dynamic instability of microtubules. The effect of cisplatin on it was reported,too.

Select

Interaction of Nicotine and Bovine Serum Albumin

Yan WANG, Yan CHENG, Hong Fang SUN

中国化学快报. 2000, 11(03): 247-250.

摘要 ( )

可视化

The binding of nicotine to bovine serum albumin (BSA) was studied by UV absorption,fluorescence,and ¹H NMR methods. With the addition of nicotine,the absorption band of BSA at about 210 nm decreased gradually,moved to longer wavelengths,and narrowed. BSA fluorescence of tryptophan residue was quenched by nicotine. The ¹H NMR peaks of nicotine moved to downfield by the addition of BSA. The experimental results showed that nicotine was capable of binding with BSA to form a 1:1 complex. BSA's high selectivity for nicotine binding suggests a unique role for this protein in the detoxification and/or transport of nicotine.

Select

The Photochemical Study of HSA and BSA with Resonance Light-Scattering and Fluorescence Spectra

Hong LIANG, Xing Can SHEN, Fang LI, Zhi Liang JIANG

中国化学快报. 2000, 11(03): 251-254.

摘要 ( )

可视化

The resonance light-scattering (RLS) of human serum albumin (HSA) and bovine serum albumin (BSA) is reported for the first time,and applied to study photochemical reaction of HSA and BSA. The fact of photocrosslinking self-association effect in HSA and BSA solutions is identified by the enhancement of RLS. The fluorescence quenching at about 350 nm and 700 nm proves that tryptophan (Trp) residues are one of the photochemical activity sites in HSA and BSA molecules. The Rayleigh scattering (RS) spectra of HSA and BSA that were neglected in fluorescence spectra before are found at about 296 nm,592 nm and 888 nm for the first time,and are of adventageous to studying the aggregation of HSA or BSA. The possible photochemical reaction mechanism is also proposed.

Select

Study on Fluorescence Property of Sparfloxacin Derivatizing System and its Application

Li Ming DU, Jing ZHOU, Qing Qin XU, Zhe Feng FAN, Rong YUAN

中国化学快报. 2000, 11(03): 255-258.

摘要 ( )

可视化

In acid medium,sparfloxacin is oxidized by nitrous acid,then reacts with hydrobromic acid to form a new fluorescence substance,which can emit the strong fluorescence,which is 151 fold more than that of sparfloxacin itself. By this,a new sensitive method for the determination of sparfloxacin in human urine by derivative-synchronous fluorescence is presented with good results.

Select

NMR Studies of 3-Acylcamphor

Zheng Ning LI, Xiu Mei LIU, Zhuo ZHENG, Hui Lin CHEN, Xiu Wen HAN

中国化学快报. 2000, 11(03): 259-260.

摘要 ( )

可视化

NMR studies of some chiral 3-acyclcamphor were conducted. A complete assignment was given to 3-(4-pyridyl)carbonylcamphor by the 2D NMR technology. Assignments were also given to other β-diketones. The results showed that those 3-acylcamphors exist in the enol forms,while 2-benzoyl menthone exists in diketon form.

Select

The Transient Time-Resolved Absorption Spectra of 1-Naphthylacetic Acid

Wen LI, Chen Ho TUNG, Jian Ping YE

中国化学快报. 2000, 11(03): 261-262.

摘要 ( )

可视化

The transient absorption spectra of 1-naphthylacetic acid in tetrahydrofuran have been obtained by laser flash photolysis technique. The transient species bands are at 509.535 and 553 nm. These peak intensities increase in the maximum values at 10.4 μs.

Select

Study on Speciation of Pr(Ⅲ) in Human Blood Plasma by Computer Simulation

Yan Min LIU, Jing Fen HAN, Zhi Jian WU, Yue WANG, Kui Yue YANG, Chun Ji NIU, Jia Zuan NI

中国化学快报. 2000, 11(03): 263-264.

摘要 ( )

可视化

Speciation of Pr(Ⅲ) in human blood plasma has been investigated by computer simulation. The speciation and distribution of Pr(Ⅲ) has been obtained. It has been found that most of Pr(Ⅲ) is bound to phosphate and to form precipitate. The results obtained are in accord with experimental observations.

Select

An Excellent Gas Chromatographic Stationary Phase for Separation of Phenol and Cresol Isomers——Heptakis(2,6-di-O-pentyl-3-O-allyl)-β-Cyclodextrin

Yue Qin ZHANG, Xue Yan SHI, Ruo Nong FU

中国化学快报. 2000, 11(03): 265-266.

摘要 ( )

可视化

Heptakis(2,6-di-O-pentyl-3-O-allyl)-β-cyclodextrin as an excellent gas chromato-graphic stationary phase separating phenol and cresol isomers is described.

Select

The lipase monolayer film self-assembly on the negatively charged poly(ethylene terephthalate) substrate

Xian Fu LIN, Lin HE, Li Heng XU, De Shui LU, Zhi Chun CHEN

中国化学快报. 2000, 11(03): 267-270.

摘要 ( )

可视化

The PET-CO_2^- film was prepared and the lipase was assembled on the surface of the PET-CO_2^- substrate. The structure at the surface and activity of lipase/PET monolayer were studied by ATR-FTIR and AFM,and other methods.

Select

The Structural Conversion in Microemulsion Systems of C₁₂H₂₅SO₃Na-C₄H₉OH-C₇C₁₆-H₂O

Chun Sheng MO

中国化学快报. 2000, 11(03): 271-274.

摘要 ( )

可视化

An investigation of the structural conversion in microemulsion system of sodium dodecylsulfonate-butanol-heptane-water was carried out by cyclic voltammetry and conductivity techniques.

Select

Adsorption and Reaction of CO on Mo(100)-c(2×2)-N Surface Studied by HREELS

Jun Fa ZHU, Jian Chang GUO, Run Sheng ZHAI, Xin He BAO, Shu Xian ZHUANG

中国化学快报. 2000, 11(03): 275-278.

摘要 ( )

可视化

High resolution electron energy loss spectroscopy (HREELS) has been used to investigate the adsorption and reaction of CO on the Mo(100)-c(2×2)N surface. CO directly adsorbed on the N atoms from the c(2×2) layer to form isocyanate (NCO) surface species was found in addition to CO adsorbed on the molybdenum atoms at 120 K,indicating that both Mo and N atoms of the Mo(100)-c(2×2)-N surface are of high reactivities for CO adsorption.

Select

Speciation of aluminum in acidic natural water equilibria with mineral phase kaolinite by chemical equilibrium calculation

Feng LIU, Shu Ping BI

中国化学快报. 2000, 11(03): 279-282.

摘要 ( )

可视化

This paper presents a computer model using thermodynamic relationships and mass balance to investigate the speciation of aluminum in acidic natural water equilibria with mineral kaolinite. Factors affecting the distribution are discussed. Compared with the case of equilibria with gibbsite, some unique characteristics are discovered. The model is verified by analyzing practical water samples. Effect of errors in thermodynamic data on calculation is evaluated by the Monte Carlo simulation.

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

2000年, 第11卷, 第03期　刊出日期：2000-03-20

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

2000年, 第11卷, 第03期 刊出日期：2000-03-20

2000年, 第11卷, 第03期　刊出日期：2000-03-20