中国化学快报

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A New Condensation Reaction of β-Keto-δ-valerolactone with Substituted Aniline

You Ming WANG, Jia Feng LI, Zheng Ming LI

中国化学快报. 1999, 10(04): 269-270.

摘要 ( )

可视化

A new condensation reaction of β-Keto-δ-valerolactones was developed. The condensation products are composed of a pair of isomers because of the formation of intramolecular hydrogen bond. Their structures were confirmed by ¹HNMR and elemental analysis.

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Cyclopropanation Versus Deoxygenation in the Reactions of Halocarbenes with pre-Aromatic Ketones

Hong Xing WANG, Gao Ju ZHANG, Wen Xiang GU, Zhen Wei HUAN, Jin Pei CHENG

中国化学快报. 1999, 10(04): 271-272.

摘要 ( )

可视化

The reactions of halocarbenes with pre-aromatic ketones 1, 2 resulted in cyclopropanation and deoxygenation products. The varying product ratio could be accounted for by a mechanism involving the carbonyl ylide intermediate.

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A Facile Synthesis of β-Cyclodextrin Monoaldehyde

Jing HU, Cheng Feng YE, Yong De ZHAO, Jun Biao CHANG, Rui Yun GUO

中国化学快报. 1999, 10(04): 273-274.

摘要 ( )

可视化

β-Cyclodextrin(β-CD) was directly oxidized in high yield to the corresponding monoaldehyde by cyclized 2-iodoxybenzoic acid (IBX) in DMSO.

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The Synthesis of Podophyllotoxin Derivatives with Macrocyclic Dilactone

Min YANG, Ning CHEN, Xin Fu PAN, Bing Chang QIN

中国化学快报. 1999, 10(04): 275-276.

摘要 ( )

可视化

Starting from podophyllotoxin, five new derivatives with macrocyclic dilactone 5~9 have been synthesized,and their structures were confirmed by IR, MS, ¹H NMR as well as HRMS. The key step is cyclization by high dilution method.

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Synthesis and Spectrophotometric Studies of 2-(1,3,4-Triazolylazo)-5-Diethylamino Phenol and 2-(5-Carboxy-1,3,4-Triazolylazo)-5-Diethylamino Phenol

Fu You PAN, Hua Ding LIANG, Chang Hua GE

中国化学快报. 1999, 10(04): 277-280.

摘要 ( )

可视化

In this paper, 2-(l, 3, 4-triazolylazo)-5-diethylamino phenol (TZAPN) and 2-(5-carboxy-1. 3, 4-triazolylazo)-5-diethylamino phenol (CTZAPN) were prepared, the protonation behaviour and the condition of spectrophotometric determination of cobalt with the reagents are reported. The results show that the new colour reagents react with cobalt to form a stable purple red complex (1:3). However, the complex formed could be changed into another species of stable absorptivity by addition of mineral acid (1+1). The method is highly selective and sensitive and has been applied to the direct determination of cobalt in some alloys with satisfactory results.

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Studies on the Total Synthesis of Pseudolaric Acid A Stereocontrolled Synthesis of the Seven-membered Lactone

You Hong HU, Li Gong OU, Xi Lu WANG, Dong Lu BAI

中国化学快报. 1999, 10(04): 281-284.

摘要 ( )

可视化

The lactone 16 was obtained stereo-and regioselectively by a reaction sequence of 9 steps in 21 0ro overall yield.

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Synthesis and Structural Characterization of new Tri (2-methyl-2-phenylpropyl) tin Carboxylates containing Germanium

Xue Qing SONG, Xiao Niu FANG, Qing Lan XIE, Jing LI

中国化学快报. 1999, 10(04): 285-288.

摘要 ( )

可视化

Eight tri(2-methyl-2-phenylpropyl) germylpropionates have been synthesized. and their structures were characterized by elemental analysis, IR, multinuclear NMR (¹H.¹³C.¹¹⁹Sn) and MS. The spectroscopic studies revealed that compounds of this type possess a tetrahedral geometry, which have been expected to have good biological activity.

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A New Euphane-Type Triterpene from Melia Azedarach

Wei Min ZHAO, Cheng Qi FAN, Zhi ZHANG

中国化学快报. 1999, 10(04): 289-290.

摘要 ( )

可视化

A new Euphane-type triterpene, named azedarachic acid, was isolated from the fruits of Melia azedarach. Its structure was determined on the basis of NMR and MS experiments.

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Four Triterpene Oligoglycosides from the seeds of Aesculus Chinensis

Jing ZHAO, Xiu Wei YANG, Yu Xin CUI, Xue Hui LIU, Shu Yan LIU, Hong Ying ZHI, Ji Yong CHEN, Fa Bing ZHU, Yun Li XUE, Dian Bo LIU

中国化学快报. 1999, 10(04): 291-294.

摘要 ( )

可视化

A pair of novel geometrically isomeric triterpenoid saponins named escins IVa and IVb, together with known escins to and Ib, were isolated from the seeds of Aesculus chinensis. Their structures were determined on the basis of spectroscopic evidences and comparison.

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New Flavonoid Glycoside from Thalictrum przewalskii

Shi Chun YU, Qing Li WU, Li Wei WANG, Pei Gen XIAO

中国化学快报. 1999, 10(04): 295-296.

摘要 ( )

可视化

A new flavonoid glycoside, 5, 7-dihydroxy-4'-methoxyflavonoid 7-O-[6-O-(4-O-acetyl-α-L-rhamnosyl)-3-O-β-D-glucosyl]-6-O-acetyl-β-D-glucoside was isolated from Thalictrum prewalskii. Its structure was determined on basis of spectroscopic evidences.

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Lepida Acid A from Basidiomycetes Russula lepida

Jian Wen TAN, Ji Kai LIU, Ze Jun DONG, Pei Gui LIU, Da Gan JI

中国化学快报. 1999, 10(04): 297-298.

摘要 ( )

可视化

A new compound, lepida acid A 1, has been isolated from the fruiting bodies of Basidiomycetes Russula lepida. Its structure was elucidated by spectral methods.

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Squamin-A,Novel Cyclopeptide from Annona squamosa

Jian Xia SHI, Hou Ming WU, Fa Hu HE, Kenichiro INOUE, Zhi Da MIN

中国化学快报. 1999, 10(04): 299-302.

摘要 ( )

可视化

A novel cyclopeptide, squamin-A has been isolated from the seeds of Annona squamosa Linn.. The structure was elucidated by extensive 2D-NMR, FABMS and amino acid analysis in combination with Marfey's reagents as cyclo-[l-prolyl-l-(S-oxo)-methionyl-l-tyrosyl-l-glycyl-l-threonyl-l-valyl-l-alanyl-l-isoleucyl].

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Chiral Separation of N-Benzoyl Phenylalanine Methyl Ester by Nonaqueous Capillary Electrophoresis

Yi LI, Lun Jia XIE, Hu Wei LIU, Wen Ting HUA

中国化学快报. 1999, 10(04): 303-306.

摘要 ( )

可视化

A successful chiral separation of N-benzoyl phenylalanine methyl ester has been achieved by nonaqueous capillary electrophoresis (NACE) using β-CD as chiral selector in formamide (FA). Some experimental parameters influencing the chiral separation such as concentration of β-CD, ionic strength and apparent pH (pH^*) are discussed.

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Studies on the Erythromycin-Modified Glassy Carbon Electrod and Interaction with DNA

Xiao Quan LU, Xi Bin ZHOU, Jing Wan KANG, Zai Xin GENG, Jin Zhang GAO

中国化学快报. 1999, 10(04): 307-310.

摘要 ( )

可视化

The chemically modified electrode (CME) which was constructed by covalent attaching erythromycin (ERM) to the glassy carbon (GC) surface was investigated in Tris-HCI buffer (pH=6.0) by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). In the potential range of -0.5~0.4V, CME yields a pair of stable redox wave. It is the carbonyl group of the ERM molecule immobilized on the GC surface that undergoes two electron redox process involving two protons. The interaction of CME with DNA was also studied by DPV. The CME shows the same interaction with DNA as that in the solution. And the result was proved by fluorescence.

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Preparation and Characterization of Gold Thin Film Electrode Modified by Microbe

Jin Kun FU, Rong Zong HU, Wei De ZHANG, Xin Sheng YU, Jin Yin FU

中国化学快报. 1999, 10(04): 311-312.

摘要 ( )

可视化

A novel method based on microbe modification has been employed to prepare gold thin film electrode. The preparation method is simple and the electrode obtained is stable and very sensitive in determining heavy metal ions. The quantitation limit of Cu²⁺ is 0.05 ng/mL.

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The Formation of the Cluster Ions NH₅⁺ and (NH₃)₂H₂⁺ and ab initio Calculation Study of Their Structures

Lian Bin LI, Xiang Hong LIU, Xiu Yan WANG

中国化学快报. 1999, 10(04): 312-324.

摘要 ( )

可视化

The mass spectra of cluster ions (NH₃)_nH₂⁺ with n<4 were measured for the first time using a MPI mass spectrometer. The structures of the cluster ions NH₅⁺ and (NH₃)₂H₂⁺ were calculated using GAUSSIAN-94 package, and stable structures for both of them were found.

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X-Ray Diffraction and NMR Study of Inclusion Complex of Podophyllotoxin with β-Cyclodextrin

Xue Yi MA, Zhi Xin LIAO, Yun ZEN, Hua Dong XIU, Ru LIU, Yao Zu CHEN

中国化学快报. 1999, 10(04): 313-316.

摘要 ( )

可视化

The inclusion complex of podophyllotoxin (P) with β-cyclodextrin(β-CD) has been studied by X-ray diffractometry and ¹HNMR, ¹³CNMR spectroscopy. The complex structure is deduced.

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Theoretical Study of Impact of Side Substituent Effect on Intramolecular Proton Transfer of Perylenequinone

Ying QIAN, Yan WANG, Ruo Zhuang LIU

中国化学快报. 1999, 10(04): 317-327.

摘要 ( )

可视化

Semi-empirical molecular orbital theory AMI method is employed to study the orthoposition substituent impact on intramolecular proton transfer reaction of perylenequinone. The calculation demonstrates that the perylenequinone molecule is of stable structure, and all substituents may cause the decrease of barriers for the hydrogen transfer reaction.

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The Quantum Scattering Study for Ion-pair Formation Reaction Na+I₂→Na⁺+I₂^- with the LCAC-SW method

Wan Yong MA, Da Cheng FENG, Zheng Ting CAI, Cong Hao DENG

中国化学快报. 1999, 10(04): 325-326.

摘要 ( )

可视化

The selected-state probabilities of collinear ion-pair formation process Na+I₂→Na⁺+I₂^- on Aten-Laming-Los two-state potential energy surface have been calculated by using LCAC-SW method. The results show that reaction probabilities are oscillatory with collision energy; the threshold energy of this ionization reaction is 2.8 ev, which is in modest agreement with experimental result.

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Photodegradation Behavior of Polycaprolactone-Poly(ethylene glycol) Block Copolymer

Jian Zhong BEI, Xing Zhou HU, Zhen Ming MA, Shen Guo WANG

中国化学快报. 1999, 10(04): 327-330.

摘要 ( )

可视化

The biodegradation behavior in vitro and in vivo of polycaprolactone-poly (ethylene glycol) block copolymer (PCE) was reported in detail. In this paper, photodegradation test of PCE was performed by exposure to UV light. The mechanical properties and the inherent viscosity of PCE samples which are subjected to photodegradation were determined. The experimental results indicated that poly (ethylene glycol) (PEO) segment in PCE copolymer is photosensitive. The photodegra-dation rate of the PCE was increased with increasing poly (ethylene glycol) content.

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Effect of Dissolved CO₂ on Protein Solubilization in Reverse Micelle

Hai Fei ZHANG, Bu Xing HAN, Jie LU, Guan Ying YANG, Hai Ke YAN

中国化学快报. 1999, 10(04): 331-332.

摘要 ( )

可视化

Effect of dissolved CO₂ on bovine serum albumin (BSA) solubilization in the reverse micelles of sodium bis (2-ethylhexyl) sulfosuccinate (AOT) in 2,2,4-trimethylpentane (iso-octane) has been studied at 308.2 K. It was found that BSA can be precipitated completely by CO₂ while the AOT and water remain in the iso-octane continuous phase. This opens up a possibility for recovery of pure protein solids directly from reverse micellar solutions.

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Investigation on the Thermostability of Germanium and Elimination of Chloride and Sulfate. Interference on Germanium in Graphite Furnace Atomic Absorption Spectrometry

Su Ping FENG, Bo ZHOU, Li Rong ZENG, Rong Li CHEN

中国化学快报. 1999, 10(04): 333-334.

摘要 ( )

可视化

The thermostability and the interference-resisting property of germanium (Ge) in graphite furnace atomic absorption spectrometry (GF.AAS) were increased remarkably when palladium and lithium nitrates were used as complexing matrix modifiers and barium nitrate as supplementary matrix modifier.

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Thin Film of Mesoporous MCM-41 Grown on Indium-Tin-Oxide Glass Substrate

Jin ZHANG, Huan Ming XIONG, Hong DING, Qiang CAI, Jie Sheng CHEN, Wen Qin PANG

中国化学快报. 1999, 10(04): 335-338.

摘要 ( )

可视化

From a basic solution containing cetyltrimethylammonium cations as the template. thin film of mesoporous MCM-41 has been grown on the surface of a pre-treated indium-tin-oxide conducting glass substrate. The channel axis of the film is oriented parallel with the surface plane of the substrate, and the film is stable after careful removal of template in vacuum.

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Preparation of Anode Material for Lithium Ion Battery by Chemical Oxidation

Yu Ping WU, Chun Rong WAN, Chang Yin JIANG, Jian Jun LI, Yang Xing LI

中国化学快报. 1999, 10(04): 339-340.

摘要 ( )

可视化

Anode material for lithium ion battery is prepared by chemical oxidation of natural graphite. After oxidation, the properties of natural graphite are modified, such as surface structure, the content of graphite phases, the number of micropores and its stability, thus the modified natural graphite can be used as anode material for commercial lithium ion battery. The reversible capacity is increased from 100 mAh/g to above 300 mAh/g, and its cycling property is also satisfactory.

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1999年, 第10卷, 第04期　刊出日期：1999-04-20

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1999年, 第10卷, 第04期 刊出日期：1999-04-20

1999年, 第10卷, 第04期　刊出日期：1999-04-20