中国化学快报

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Organic Polyvalent Iodinc Reagents-Promoted Coupling Reaction of 1-Alkynes

Jun Hua WANG, Xian HUANG

中国化学快报. 1999, 10(07): 529-530.

摘要 ( )

可视化

Terminal alkynes couple smoothly in the presence of PhI(OAc)₂ or PhI(OH)OTs. catalytic CuI and base, alfordine conjugated diynes.

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Diels-Alder Reaction of Hedychenone and Maleic Anhydride

Qing ZHAO, Cheng ZOU, Xiao Jiang HAO, Yao Zu CHEN

中国化学快报. 1999, 10(07): 531-532.

摘要 ( )

可视化

Diels-Alder reaction of hedychenone 1 and malefic anhydride 2 gave several products 4~7, whose structures were identified by spectral methods. Effect of temperature on the reaction was disscussed.

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The Synthesis of Symmetrical Azobenzenes from Anilines by Phase Transfer Catalysis

Xiao Yang WANG, Yu Lu WANG, Jian Ping, Li Fang SUN, Zi Yi ZHANG

中国化学快报. 1999, 10(07): 533-536.

摘要 ( )

可视化

Using galvinoxyl as catalyst, the phase transfer catalyzed method of oxidation of primary amines to symmetrical azobenzenes with a saturated solution of potassium ferricyanide in 2 mol/L aqueous potassium hydroxide and dichloromethane is described. The reaction has intimate relation with Hammett substituent constants. This report offers an efficient and rapid method to prepare azobenzenes and a possible mechanism is also suggested.

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Synthesis of Analogs of Phosphoamino Acids and their BiomimicReactions

Yong JU, Dong Yan QIN, Yu Fen ZHAO

中国化学快报. 1999, 10(07): 537-538.

摘要 ( )

可视化

In order to further confirm the biomimic properties of N-phosphoamino acids. A series of model compounds, analogue of phosphoryl amino acids, were synthesized and their biomimic mechanism was also investigated by NMR and MS methods. The results indicated that the reactivity of phosphoryl biological small molecules was depended on the configuration, function groups and positions.

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Synthesis and Properties of Double Calix[4]arene Derivatives Linked by Schiff-base in the Lower Rim

Hu Shan YUAN, Zhi Tang HUANG

中国化学快报. 1999, 10(07): 539-542.

摘要 ( )

可视化

25,27-bis-(2-aminoethoxy)-p-tert-butylcalix[4]arene was linked to double calix[4]arene derivatives by the Schiff-base moiety in its lower rim. They behave strong ability to complex with Pb²⁺,Cu²⁺ and Co²⁺.

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Asymmetric Synthesis of Polyhydroxy Pyrrolidinonyl Nucleoside Analogues from Tartaric acid

Li Ren JIN, Jian Liang YE, Yong XIE, Jiang Hong SHI, Pei Qiang HUANG, Kyeong Eun JUNG, Hong LIM

中国化学快报. 1999, 10(07): 543-546.

摘要 ( )

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Asymmetric synthesis of novel optically active nucleoside analogues 7 from natural tartaric acid is described. In the given nucleoside analogues an optically active polyhydroxy pyrrolidinonyl ring is in place of the tetrahydrofuran ring.

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Highly Stereoselective Synthesis of (E, E)-3,7-Dimethyl-2,6-decadiene-1, 10-diol

Zuo Sheng LIU, Jiong LAN, Li Zeng PENG, Yu Lin LI, Ya Cheng XING, Wen CEN

中国化学快报. 1999, 10(07): 547-548.

摘要 ( )

可视化

A total synthesis of (E,E)-3,7-dimethyl-2,6-decadiene-1,10-diol, using 1,3-transfor-mation of 2. 3-epoxy alcohol and Claisen rearrangement of allyl vinyl ether as key steps. is described.

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Synthesis of Salmon Calcitonin Analogs Using Fmoc-based Chemistry on MBHA Resins

Bin YANG, Zhen Kai DING, Zong Jin HAN, Qi Kai ZHANG

中国化学快报. 1999, 10(07): 549-552.

摘要 ( )

可视化

Peptide analogs of salmon calcitonin (sCT) were synthesized by using Fmoc-based chemistry on MBHA resins. Salmon calcitonin was modified by 1)cysteines at positions 1 and 7 were replaced by valine and alanine respectively to result in open chain analogs,2) the glycine at position 30 was replaced by alanine, D-alanine and sarcosine respectively, and 3) some residues were deleted besides the above two modifications. A modified two-step deprotection/cleavage procedure, in which a solvent of TFA/TMSBr/thioanisole/EDT/m-cresol combines with HF cleavage, was adopted in SPPS.

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The Carbonylations of Cyclohexene with Carbon Dioxide

Da Bin GAO, Jing Mei YIN, Yong An MA

中国化学快报. 1999, 10(07): 553-554.

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可视化

It is introduced that the carbonylations of cyclohexene with CO₂ can take place under ambient conditions by catalysis of Co(acac)₂ in the presence of ultraviolet irradiation.

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Secondary Structure in Solution of an Analog of Salmon Calcitonin:[Val¹, Ala⁷]sCT

Bin YANG, Hou Li JIANG, Zhen Kai DING, Qi Kai ZHANG

中国化学快报. 1999, 10(07): 555-558.

摘要 ( )

可视化

Secondary structure of [Val¹, Ala⁷]sCT, an analog of salmon caleitonin (sCT) not containing an N-terminal disultide bridge. was investigated by circular dichroism (CD) and Fourier-transform infrared spectroscopy (FTIR) methods. Both CD and FTIR results show that the main conformational structure of [Val¹, Ala⁷]sCT in aqueous solution is random coil structure while in trifluorethanol (TFE) it displays a strong α-helical structure. The relationship between the biological activity and the conformational structure of [Val¹, Ala⁷]sCT is also discussed.

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Resolution of Spiro[4.4]nonane-1,6-dione by Chiral Inclusion Complexation

Xiao Ming FENG, De Chao ZENG, Zhi Li, Yao Zhong JIANG

中国化学快报. 1999, 10(07): 559-562.

摘要 ( )

可视化

The racemic spiro[4.4]nonane-l,6-dione was efficiently resolved through an enantioselective inclusion complexation using chiral host BINOL by simple recrystallization with 31.9~38.4% yield and 100%ee.

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Two Novel Sesquiterpene Diglycosides from Dictamnus dasycarpus

Wei Min ZHAO, Shun Chun WANG, Kurt HOSTETTMANN, Guo Wei QIN and Ren Sheng XU

中国化学快报. 1999, 10(07): 563-566.

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可视化

Two novel sesquiterpene diglycusides named dictamnosides F 1 and G 2 were isolated from methanol extract of the root bark of Dictanuurs dcrsvcanptrs. Their structures were determined on the basis of spectroscopic and chemical analysis.

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Phenolic Components from Rhododendron latoucheae Part 5 in the series “Chemical Studies on Ericaceae Plants”

Cheng Qi FAN, Gen Jin YANG, Wei Min ZHAO, Bing Yang DING, Guo Wei QIN

中国化学快报. 1999, 10(07): 567-570.

摘要 ( )

可视化

From the leaves of Rhododendron latouclreae (Ericaceae), two new natural phenolic compounds named (+)-rhodolatouchol 1 and isoepirhododendrin 4 were identified. Six other known compounds. (+)-rhododendrol, epirhododendrin, 4-[3'-O-(3-D-glucopyranosyl-4'-hydroxyphenyl]-2-butanone, 4-(4'-O-(3-D-glucopyranosylphenyl)-2-butanone, benzyl-O-[3-D-glucopyranoside and arbutin were also obtained.

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Two New Eremophilenolides from Ligularia fischeri

Wen Shu WANG, Kun GAO, Zhong Jian JIA

中国化学快报. 1999, 10(07): 571-572.

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可视化

Chemical investigation of L.fischeri afforded two new eremophilenolides, which wereidentitied as 6β-methoxy-8β-hydroy-eremophil-7(11)-en-12.8a-olide 1; 6-oxo-8β-hydroxy-eremophil-7(11)-en-12.8α-olide 2.

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A New Isopimarane Diterpene from Nepeta prattii

Zhen Fu HOU, Li YANG, Yong Qiong TU, Yu LI

中国化学快报. 1999, 10(07): 573-574.

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可视化

A new isopimarane diterpene, isopimar-l5-en-3β, 8β, 20-triol, was isolated from ,Nepeta prattii. Its structure was elucidated by spectral methods (EIMS, 1D and 2D NMR).

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Two New Oxindole Alkaloids from Ervatamia yunnanensis

Yang YU, Jin Ming GAO, Ji Kai LIU

中国化学快报. 1999, 10(07): 575-578.

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可视化

Two new oxindole alkaloids, 17-demethoxy-hydroisorhynchophylline 1 and 17-demethoxv-hydroisorhynchophylline N-oxide 2, have been isolated from the aerial parts of Erva-ramin yunnanensis, and their structures were elucidated on the basis of spectroscopic analysis.

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Gnetifolin L and O, Two Dimeric Stilbenes from Gnetum Montanum

Hao CHEN, Mao LIN

中国化学快报. 1999, 10(07): 579-582.

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可视化

Two new dimeric stilbenes, named gnetifolin L and gnetifolin O, were isolated from the alcoholic ewract of lianas of Gnetum montanhn.Their structures were elucidated mainly on the basis of spectroscopic data including 2D-NMR studies on peracetate derivatives.

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Preparation of Cibacron Blue F3GA Bonded Poly (styrenedivinylbenzene) (PSDVB) Microbeads Used for High Performance Affinity Chromatography

Li SHEN, Bo Hui XIONG, Run Zhi CONG, Jun De WANG

中国化学快报. 1999, 10(07): 583-586.

摘要 ( )

可视化

Rigid PSDVB microbeads have been modified with poly（vinyl alcohol) (PVA) adsorbed on their surface to produce an affinny medium. Then Cibacron Blue F3GA was covalentlv attached to the supports. The initial concentration of PVA has effect on the adsorption of PVA. The non-specific interaction of bovine serum albumin (BSA) on the microbeads decreases、、ith the PVA adsorbed. The pH stability test shows that the aftinitv medium is stable up to pH 11.0. And it has specific interaction with lysoryme, but not with pepsin.

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Asymmetrical Conductivity of TCNQ Modificd Au/Thiol-Lipid Bilayers in Fe(CN)₆^3-/4-solution

Peng DIAO, Dian Lu JIANG, Xiao Li CUI, Deng Ping GU, Ru Ting TONG, Bing ZHONG

中国化学快报. 1999, 10(07): 587-590.

摘要 ( )

可视化

In this work, electron transfer across Au supported octadecanethiolphosphatidyl-choline (Au/ODT-PC) bilayers, which were modified with 7.7,8,8-tetracyanoquinodimethane (TCNQ). were investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Results of EIS experiments show that the TCNQ molecules act as electron conductors in the bilayer. Cyclic voltammetry indicates that the TCNQ moditied Au/thiol-lipid bilavers display strong asymmetrical conductivity in Fe(CN)₆^3/4 solution.

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The Effects of Physical Aging on Tensile Behavior of Polyphenylquinoxaline Films

Wan Jun LIU, Yue WANG, Jing Shu SHEN, Feng Cai LU, Mao XU

中国化学快报. 1999, 10(07): 591-592.

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可视化

The effects of physical aging on the tensile property of notched samples and the endothermic peak at glass transition region of polyphenylquinoxaline films were studied.

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Synthesis and Structure of Butylene Terephthalate-ε-Caprolactone Copolyesters

Xiao Min CHENG, Xiao Lie LUO, Zhi Bo LI, De Zhu MA

中国化学快报. 1999, 10(07): 593-596.

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可视化

A series of butylene terephthalate-ε-caprolactone copolyesters (BCL) with different hard segment content were successfully synthesized and characterized by ¹H-NMR. DSC. PLM and U-iscometer. the sequence structure and crystallization characteristics of BCI, copolyesters were carefully investigated.

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Polymerization of Styrene and 1,3-Butadiene by Catalyst Systems Based on Calix[4]arene Neodymium Complexes

Yan Song ZHENG, Zhi Quan SHEN

中国化学快报. 1999, 10(07): 597-600.

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可视化

Polymerization of styrene and 1,3-butadiene were performed by calix[4]arene- neodymium complexes using di-n-butylmagnesium and tri-iso-butylaluminum as cocatalyst respectively. The effect of the substituent groups in calix[4]arene on the catalytic activity was first investigated.

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Effect of Dissolved CO₂ and Tetrahydrofuran on the Polymerization of Acrylic Acid

Qun XU, Bu Xing HAN, Hai Ke YAN

中国化学快报. 1999, 10(07): 601-602.

摘要 ( )

可视化

The polymerization of acrylic acid (AA) with dissolved carbon dioxide and tetrahydrofuran (THF) in the monomer is studied. Viscosity measurement, differential scanning calorimetn (DSC). and scanning electron microscopy (SEM) indicate that the concentration of tetrahvdrofuran has pronounced effect on the molecular weight (Mη). glass transition temperature (Tg), and the morphology ofthe product.

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Synthesis and Fluorescent Properties of New Binuclear Europium β-Diketone Chelates Eu_mY_1-m(TTA)3phen as Red Electroluminescent Materials

Wei Guo ZHU, Xiao Qiang WEI, Zhi Yun LU, Qing JIANG, Ming Gui XIE

中国化学快报. 1999, 10(07): 603-606.

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可视化

A new type of binuclear europium y-dihetone chelates Eu_mY_1-m (TTA); phen (0≤m≤1) and the influence of the proportion of Y³⁺ on fluorescence intensity of the Lu-complexes were studied. It was found the proportion of Y³⁺ could atlect the fluorescence properties and the film formation seriously. only m≥0.5Y³⁺ could increase the luminescent intensity and improve the film formation. As a result, three new binuclear europiump-dihetone chelates con5fisted of Eu_mY_1-m (TTA)₃ phen (m=0.9. 0.7 and 0.5) were designed and synthesized. Their structures were elucidated by IR. UV. DSC and Eaementary Analysis. Their PL properties were studied. The results showed that the three binuclear europiump-diketone chelates had better PI. properties and film formation than Eu(TTA)₃phen. They could emit sharply red light, and fluorescent wavelength of them was all at 613nm (half bandwidth: lOnm). They can be used as red organic electroluminescent materials (OELMs) in organic electroluminescent devices (GELDS).

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PVP-Supported Palladium-Cadmium Bimetallic Catalyst for the Hydrogen Transfer Dechlorination of Aryl Chlorides

Ru Hong KANG, Jiang Hua MA, Xin Hui LIU, Shu Mei HE

中国化学快报. 1999, 10(07): 607-610.

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可视化

PVP-supported bimetallic catalyst. PVP-PdCl₂-CdCl₂, exhibits extremely high catalytic activity for the hydrogen transfer dechlorination of aryl chlorides in neutral environment. The yields of dechlorination products are high under mild reaction conditions and the operation is simple.

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Atom Transfer Radical Polymerization of Methyl Methacrylate with α,α-Dichlorotoluene or α,α,α-Trichlorotoluene as Initiator

Zhi Feng FU, Yan SHI, Ming Zhi HUANG, Shu Ke JIAO

中国化学快报. 1999, 10(07): 611-614.

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可视化

The atom transfer radical polymerization (ATRP) of methyl methacrylate using α.α-dichlorotoluene or α.α,α-trichlorotoluene as the initiator and CuCl/2,2'-bipyridine complex as the catalyst was investigated. α,α-Dichlorotoluene gave good control of molecular weight with high initiation etliciency and low polydispersity. While α,α,α-trichlorotoluene gave very slow polymerization rate. which could be improved by the addition of Cu (0) to the system.

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A Comparison of Three Heuristic Algorithms for Molecular Docking

Ting Jun HOU, Jun Mei WANG, Xiao Jie XU

中国化学快报. 1999, 10(07): 615-618.

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可视化

Three heuristic algorithms: simulated annealing, genetic algorithm. and Tabu search were compared to molecular docking procedure using 3 protein-ligand systems. Statistical analysis of the insults indicated that the Tabu search showed the best performance in terms of locating solutions close to the crystallographic ligand conformation. From the comparisons, a hybrid search algorithm was proposed. which gave superior results compared with any one of the algorithms alone.

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Density Functional Study on the Vibrational Frequencies of Hydrazoic Acid and Methyl Azide

Ai Ping FU, Dong Mei DU, Zheng Yu ZHOU

中国化学快报. 1999, 10(07): 619-622.

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可视化

Harmonic vibrational frequencies of hydrazoic acid and methy azidc calsulated using HF.MP2 methods and five pipular density functional(DFT)methods and compared with experimental results.Of these seven methods.BLYP reproduces the observed frequencies most satisfactorily.while the results in HF and MP2 are worse.These imdicate the BLYP calculation is a very promising approach for understanding the obser spectral features.

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1999年, 第10卷, 第07期　刊出日期：1999-07-20

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1999年, 第10卷, 第07期 刊出日期：1999-07-20

1999年, 第10卷, 第07期　刊出日期：1999-07-20