中国化学快报

Select

Asymmetric Reformatsky Reaction Induced by Dipeptides

Zhong Yi WANG, Jie SHEN, Chang Sheng JIANG, Tian Pa YOU

中国化学快报. 2000, 11(08): 659-662.

摘要 ( )

可视化

For the first time, synthetic dipeptides were applied to the catalysis of asymmetric Reformatsky reaction. Review in this domain & factors influencing enantioselectivity were discussed.

Select

Synthesis of the C5-C10 Segment of Taurospongin A

Guang Rong ZHENG, Wei LU, Jun Chao CAI

中国化学快报. 2000, 11(08): 663-664.

摘要 ( )

可视化

Stereoselective synthesis of C5-C10 segment 3 of taurospongin A (1) has been developed successfully from L-(-)-malic acid.

Select

Synthesis of 2-methoxy-6-oxo-1,4,2-diazaphosphorinane-2-oxide, A New Potential Antitumor Phosphorus Heterocycle Compound

Liang XU, Guang Rong ZHENG, Min XIA, Jun Chao CAI

中国化学快报. 2000, 11(08): 665-666.

摘要 ( )

可视化

2-methoxy-6-oxo-1,4,2-diazaphosphorinane-2-oxide 8, phosphorus counterpart of 2,6-dioxopiperazine, was synthesized as antitumor agent. The new phosphorus heterocycle compound 8 is the key intermediate in the synthesis of phosphorus counterpart of bisdioxopiperazine.

Select

Synthesis of Some Novel 2,6-Dimethoxyhydroquinone-3-mercaptoacetyl-peptide Conjugates as Potential Antitumor Agents

Yu Fei SONG, Pin YANG, Leung SHEH

中国化学快报. 2000, 11(08): 667-670.

摘要 ( )

可视化

This paper reports an ongoing study of the use of short chain peptides as carriers of a potential antitumor agents: 2,6-dimethoxyhydroquinone-3-mercaptoacetic acid (DMQ-MA). Three new peptide-DMQ-MA conjugates: DMQ-MA-arg-arg-ome, DMQ-MA-lys(cbz)-arg-ome, DMQ-MA-lys(cbz)-arg-arg-ome were synthesized by coupling protected amino acids in solution and the next conjugation was achieved by reacting with pentafluorophenyl ester of DMQ-MA in DMF, and further study on their ability to inhibit human pulmonary adenocarcinoma cell line (PC-9 cells) and oral epidermoid carcinoma cell line (KB) are investigating.

Select

Preparation of AChE Inhibitors From Jujubogenin

Yu ZHAO, Yuan Ling KU, Shoei Sheng LEE

中国化学快报. 2000, 11(08): 671-674.

摘要 ( )

可视化

A dammarane derivative dihydrojujubogenin-2-en-1-one, which possesses a skeleton and pharmacophore partially similar to those of Territrem B, a potent AChE inhibitor, was synthesized via three different paths. The anti-AChE activity of this compound and related analogue was measured.

Select

Synthesis and Characterization of Fully-Functionalized Polysilanes for Photorefractive Materials

Hong Ding TANG, Jin Gui QIN

中国化学快报. 2000, 11(08): 675-676.

摘要 ( )

可视化

Hydrogen-containing polysilanes and chromophore-containing polysilanes are prepared by traditional Wurtz coupling and subsequent hydrosilylation. They are characterized by ¹H-NMR, FT-IR, UV/VIS spectroscopies, differential scanning calorimetry (DSC) and gel permeation chromatography (GPC).

Select

Total Synthesis of the Natural Product-Pinosylvin and its Analog

Zhi Song PIAO, Lin WANG, Zhi Zhong ZHAO

中国化学快报. 2000, 11(08): 677-678.

摘要 ( )

可视化

We synthesised a natural product (10), isolated from G.parvifolium, and its analog. The synthetic product was characterized by elemental analysis and ¹H-NMR in comparision with the corresponding natural product.

Select

A Novel Photoproduct of Uracil in Phosphate-Buffered Saline

Feng LIN

中国化学快报. 2000, 11(08): 679-680.

摘要 ( )

可视化

The photolysis of uracil in phosphate-buffered saline (PBS, pH 8.0) under the irradiation of medium pressure mercury lamp (MPML) leads to the production of a novel compound C₄H₅N₂O₆P. The composition and structure of the compound has been identified by elemental analysis, EI-MS, UV, IR, ¹H, ¹³C, ³¹P-NMR.

Select

Polyaniline Formed in Alkaline Solution-A New Luminous Material

Nian Bing LI, Sheng Tao ZHANG, Pei Dao DING

中国化学快报. 2000, 11(08): 681-684.

摘要 ( )

可视化

Electropolymerization of aniline in KOH solution and properties of the polymer are studied by using in situ reflex ellipsometry, cyclic voltammetry and fluorescence spectroscopic method. The change patterns of ellipsometric parameters and the thickness of film in the process of electropolymerization are investigated. The complex refractive indices and the fluorescence spectra of PAN indicate that the PAN is a new kind of luminous material.

Select

A New Organic Up-conversion Laser Dye HEASPS

Yan REN, Guang Yong ZHOU, Chun WANG, Xiao Mei WANG, Zhi LIU, Xian ZHAO, Wen Tao YU, Min Hua JIANG

中国化学快报. 2000, 11(08): 685-688.

摘要 ( )

可视化

A new organic dye, trans-4-[p-(N-hydroxyethyl-N-ethylamino)styryl]-N-methyl-pyridinium p-toluene sulfonate (HEASPS) has been synthesized and its structure has been determined. Pumped with a 1064 nm, 50 ps laser pulses, 0.05 mol/L HEASPS/DMF solution showed the two-photon pumped (TPP) output/input efficiency of 9.1% which is higher than that of known TPP laser dyes trans-4-[p-(N-hydroxyethyl-N-methylamino) styryl]-N-methylpyridinium iodide (ASPI) and trans-4-[p-(N-hydroxyethyl-N-methylamino) styryl]-N-methylpyridinium p-toluene sulfonate (HMASPS) at the same experimental conditions.

Select

Novel Product and Its Derivatives from the Reaction of Lappaconitine with HIO₄

Qiao Hong CHEN, Feng Peng WANG, Kai Bai YU

中国化学快报. 2000, 11(08): 689-692.

摘要 ( )

可视化

Treatment of lappaconitine 1 with HIO₄ at room temperature afforded 2 in 41% yield, to which Br₂-HOAc solution was added and allowed to stand at room temperature for 2 days to give 3 (13%) and 4 (31%).

Select

Substituents Effect on the Optical Properties of Benzonitrile and Oligobenzonitriles

Ting Jun HOU, You Yong LI, Yuan Kang HE, Hui Ying CHEN, Xiao Jie XU

中国化学快报. 2000, 11(08): 693-696.

摘要 ( )

可视化

The semiempirical calculations were performed to discuss the effects of different substituents on the optical properties of a series of substituted benzonitriles and their corresponding oligomers. The substituents located in para, meta and ortho-position of the benzenoid ring involve a large range of δ-π electron-donor-acceptor capability. Theoretical analysis shows that the optical property is affected by the steric and electronic characteristics of the substituents on the benzenoid ring, moreover, the third-order polarizability regularly varies with the polymerization degrees.

Select

Two New Oleanane Saponins from Anemone anhuiensis

Qing Wen ZHANG, Wen Cai YE, Chun Tao CHE, Shou Xun ZHAO

中国化学快报. 2000, 11(08): 697-700.

摘要 ( )

可视化

Two new oleanane triterpene saponins, named as anhuienside C (1) and D (2), were isolated from the rhizomes of Anemone anhuiensis (Ranunculaceae). The structures of the new compounds were elucidated as 3-O-α-L-rhamnopyranosyl (1→2)-β-D-xylopyranosyl oleanolic acid 28-O-b-D-glucopyranosyl (1→6)-β-D-glucopyranosyl ester (1) and 3-O-β-D-xylopyranosyl oleanolic acid 28-O-α-L-rhamnopyranosyl (1→4)-β-D-glucopyranosyl (1→6)-β-D-gluco-pyranosyl ester (2), respectively.

Select

Pyrohyperforin, A New Prenylated Phloroglucinol from Hypericum perforatum

Ming De SHAN, Li Hong HU, Zhong Liang CHEN

中国化学快报. 2000, 11(08): 701-704.

摘要 ( )

可视化

Pyrohyperforin, a new prenylated phloroglucinol was isolated from Hypericum perforatum, its structure was established on the basis of spectral data.

Select

New Bibenzyl and Phenanthrenedione from Dendrobium densiflorum

Cheng Qi FAN, Wei Min ZHAO, Guo Wei QIN

中国化学快报. 2000, 11(08): 705-706.

摘要 ( )

可视化

A new bibenzyl 1 and a new phenanthrenedione 2 were identified from the stems of Dendrobium densiflorum (Orchidaceae).

Select

Dasycarine, a New Quinoline Alkaloid from Dictamnus dasycarpus

Jin CHEN, Jing Sheng TANG, Jun TIAN, You Ping WANG, Feng E WU

中国化学快报. 2000, 11(08): 707-708.

摘要 ( )

可视化

Dasycarine, a new quinoline alkaloid along with five known compounds, dictamine, dihydroobacunone, obacunone, fraxinellone and β-sitosterol, were isolated from Dictamnus dasycarpus. The structure of dasycarine was identified as 4,5,8-trimethoxyl-3-(3-methyl-2-butenyl)-2-quinone by 1D and 2D NMR techniques.

Select

A New Monoterpene Glycoside from Swertia punicea

Xin MING, Ming Hua QIU, Rui Lin NIE, Guo Lin ZHANG

中国化学快报. 2000, 11(08): 709-710.

摘要 ( )

可视化

A new monoterpene glycoside, 2,6-dimethyl-2E,6E-octadienoic acid 1,6'-lactone 8-β-D-glucopyranoside, was isolated from Swertia punicea, accompanying with six known compounds 1-O-primeverosyl-3,7-dimethoxy-8-hydroxyxanthone, 1-O-primeverosyl-3,7,8-tri-methoxyxan-thone, epi-eustomoside, 1-hydroxy-3,7,8-trimethoxyxanthone, 1,8-dihydroxy-3,7-dimethoxy xanthone and isovitexine. Their structures were elucidated based on spectral evidence.

Select

A New Ursene Type Triterpenoid from Crepis napifera

Shao Hua WU, Xiao Dong LUO, Yun Bao MA, Da Gang WU

中国化学快报. 2000, 11(08): 711-712.

摘要 ( )

可视化

A new triterpenoid, urs-20-en-3β-acetoxy-22α-ol, and three known compounds 3β-acetoxy-amyrin, 3β-acetoxy-lupeol, lupeol were isolated from the leaves of Crepis napifera (Franch.) Babc. Their structures were determined by means of spectroscopic studies.

Select

Strong Room-Temperature Photoluminescence from the Novel Adduct of C₆₀ with Aliphatic Amines

Jin Li QIAO, Qiao Juan GONG, Chuan DONG, Wei Jun JIN

中国化学快报. 2000, 11(08): 713-716.

摘要 ( )

可视化

Strong room-temperature photoluminescence from the adducts of C₆₀ reacting with five different aliphatic amines, namely propylethylamine (PPA), n-butyl amine (BTA), n-heptylamine (HPA) and dodecylamine (DDA) and diethylamine (DEA), was firstly found from their toluene solution at relatively shorter wavelength around 519 nm.The fluorescence intensity has a good correlation with the length of n-alkyl group chain, the steric position and concentration of different amines and setting of solution as well as the UV-radiation. Their fluorescence quenching by concentration and by aromatic electron-donor N,N-dimethylaniline (DMA) were first investigated and determined.

Select

Chiral Discrimination in N-(O, O-dialkyl) phosphoamino Acid Monolayers at the Air-water Interface

Ning XU, Zhou ZHOU, Hong Mei WANG, Chang Hui DENG, Yan Mei LI, Yu Fen ZHAO, Ling Xuan WANG, Tian Kai LI

中国化学快报. 2000, 11(08): 717-718.

摘要 ( )

可视化

In this paper, chiral discrimination in N-(O, O-dialkyl) phosphoamino acid monolayers at the air/water interface was studied and it was revealed that the D:L=1:1 racemic monolayer of N-(O, O-dihexadecyl) phosphoalanine is packed more densely in solid phase while shows a higher LE to LC transition pressure than the enantiomeric ones.

Select

Enhanced Electron Transfer for Hemoglobin in 2C₁₂N⁺PVS^- Composite Films Modified on Pyrolytic Graphite Electrodes

Yu Jiao HU, Ying Lin ZHOU, Yong Huai ZENG, Nai Fei HU

中国化学快报. 2000, 11(08): 719-720.

摘要 ( )

可视化

Stable thin films made from polyionic complex 2C₁₂N⁺PVS^- with incorporated Hb on PG electrodes were characterized by electrochemistry. The electron transfer between Hb and PG electrodes was greatly facilitated in microenvironment of 2C₁₂N⁺PVS^- films. The Hb-2C₁₂N⁺PVS^- films could be used to catalytically reduce trichloroacetic acid.

Select

Kinetic Study on Horseradish Peroxidase Interacting with Cyclodextrin

Jian Bo CHEN, Chun Gu XIA, Shu Ben LI

中国化学快报. 2000, 11(08): 721-724.

摘要 ( )

可视化

The catalyst reactivity of Horseradish peroxidase was enhanced in the presence of β-cyclodextrin. During this course, β-cyclodextrin played a role of stabilizing the intermediates of HRP. The results have been investigated using spectra and calculation.

Select

La³⁺ Transmembrane Research in Guinea Pig Ventricular Cells by Fura-2 Fluorescence

Rong CHEN, Pin YANG, Chun Ying WEI

中国化学快报. 2000, 11(08): 725-726.

摘要 ( )

可视化

Binding of La³⁺ to Fura-2 can change 340/380 nm fluorescence intensity ratio. Whether La³⁺ cross ventricular cell membrane was detected by this fluorescent probe technique. Fura-2 loaded isolated guinea pig ventricular cells were exposed to 0.01-0.1mM extracellular Lanthanum ion concentration, 340nm/380 nm fluorescence ratio was not changed. Using calcium channel agonist BAY K8644, KCL (35mM) depolarization to open the voltage-dependent calcium channel (VDCC); Adrenoceptor agonist to excite adrenoceptor, 340/380 ratio was not changed, suggesting that La³⁺ can not enter guinea pig ventricular cells in this case.

Select

Is HOMO Energy Level a Good Parameter to Characterize Antioxidant Activity

Hong Yu ZHANG, De Zhan CHEN

中国化学快报. 2000, 11(08): 727-730.

摘要 ( )

可视化

Semiempirical quantum chemical method AMI was employed to calculate the highest occupied molecular orbital (HOMO) energy levels (E_HOMO) for various types of antioxidants. It was verified that the correlation between logarithm of free radical scavenging rate constants (lgks) and E_HOMO substantially arises from the correlation between E_HOMO and O-H bond dissociation energies (BDE) of antioxidants. Furthermore, E_HOMO were poorly correlated with the logarithm of relative free radical scavenging rate constants (lgk₃/k₁) for various types of antioxidants that possess complex structures (r=0.5602). So in a broad sense, E_HOMO was not an appropriate parameter to characterize the free radical scavenging activity of antioxidants.

Select

Enantioseparation of some Racemic Compounds on Cellulose Tris (3,5-dimethylphenylcarbamate) Chiral Stationary Phase

Xiao Qian HAN, Hui Tao LIU, Jin Zhang GAO, Jing Guo HOU, Chong Yang LI, Guo Hu ZHAO

中国化学快报. 2000, 11(08): 731-734.

摘要 ( )

可视化

Seven chiral compounds were resolved on cellulose tris (3,5-dimethylphenylcarbamate) chiral stationary phase (CDMPC-CSP) using n-hexane/alcohol as mobile phase. Solvent strength and structural characteristics of the compounds effecting on the retention and resolution were discussed. Satisfactory separation was obtained.

Select

Poly (ethylene oxide) Solubilization in Reverse Microemulsion:Conductivity and UV-Vis Spectra Studies

Zhen Shan HOU, Zhi Ping LI, Han Qing WANG

中国化学快报. 2000, 11(08): 735-738.

摘要 ( )

可视化

The effect of poly (ethylene oxide) (PEO) on the w/o microemulsion is studied. The addition of PEO induces a decrease of attractive interaction between droplets in reverse microemulsion. Due to the absence of interaction between cationic surfactant and neutral polymer, the polymer molecules are forced into the interior of water core, avoiding the interfacial region.

Select

Dielectric Behavior of Middle Phase Microemulsion

Jian Ping LEI, Ying LI, Kong Shuang ZHAO

中国化学快报. 2000, 11(08): 739-742.

摘要 ( )

可视化

Dielectric measurements were performed on middle phase microemulsions composed of sodium dodecylsulfate(SDS), cetyltrimethylammonium bromide(CTAB), n-butanol, n-heptane and brine. Distinct and unique dielectric behavior, with characteristic frequency dependence regularity on the salinity of the microemulsions, was observed in the low-frequency range from 10-10³Hz. It can be considered to be an interfacial polarization mechanism.

Select

Pretreatment of Polymer-Supported Pd-Co and Its Catalytic Activity

Yan GAO, Shi Jian LIAO, Fu Dong WANG, Yue GAO, Xi Gao JIAN

中国化学快报. 2000, 11(08): 743-744.

摘要 ( )

可视化

Various pretreatments of poly (N-vinyl-2-pyrrolidone) (PVP) protected palladium-cobalt system result in different catalytic activities in the hydrodechlorination of chlorobenzene.

Select

The Synthesis of Isotactic Polypropylene with Spherical Morphology via Supported Metallocene Catalyst

Han HONG, Wei Dong YAN, Ming Ge ZHANG, Nai ZHOU, Da Wei HE, You Liang HU

中国化学快报. 2000, 11(08): 745-746.

摘要 ( )

可视化

Polymerization or propylene was carried out under bulk process at 70℃ using the supported metallocene catalyst with four kinds of SiO₂ as carrier with triethylaluminum used as co-catalyst. The morphology of the products was studied by SEM. It was found the property of the carriers gave great effect on the fine structure of the products as well as the apperance.

Select

Chemical Bond Parameters in Sr₃MRhO₆ (M=Rare earth)

Zhi Jian WU, Si Yuan ZHANG

中国化学快报. 2000, 11(08): 747-748.

摘要 ( )

可视化

Chemical bond parameters, that is, bond covalency, bond valence, macroscopic linear susceptibility, and oxidation states of elements in Sr₃MRhO₆ (M=Sm, Eu, Tb, Dy, Ho, Er, Yb) have been calculated. The results indicate that the bond covalency of M-O decreases sharply with the decrease of ionic radius of M³⁺ from Sm to Yb, while no obvious trend has been found for Rh-O and Sr-O bonds. The global instability index indicates that the crystal structures of Sr₃MrhO₆ (M=Sm, Eu, Tb, Dy, Ho) have strained bonds.

Select

Crystal Structure and Magnetic Studies of a New Nitronyl Nitroxide Compound

Liang DING, De Qing ZHANG, Bin ZHANG, Dao Ben ZHU

中国化学快报. 2000, 11(08): 749-752.

摘要 ( )

可视化

Compound 1 was first synthesized and characterized. Its crystal structure and magnetic property were determined and investigated. Discussion about the molecule packing in crystal and the macroscopic magnetism was also presented, in combination with computing study of the spatial distribution over the molecule.

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08期　刊出日期：2000-08-20

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08期 刊出日期：2000-08-20

2000年, 第11卷, 第08期　刊出日期：2000-08-20