中国化学快报

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Polyethylene Glycol as Support and Phase Transfer Catalyst in Aqueous Palladium-catalyzed Liquid-phase Synthesis

Min XIA, Yan Guang WANG

中国化学快报. 2001, 12(11): 941-942.

摘要 ( )

可视化

Excellent yields and purity were obtained in the aqueous medium Suzuki, Sonogashira, Stille and Heck reactions using palladium (Ⅱ) as catalyst in liquid phase synthesis. Polyethylene glycol (PEG) acted as soluble polymeric support and phase transfer catalyst as well.

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Mono-Allylation of Gem-Diacetates with Allylsamarium Bromide

Xiao Xia WANG, Yong Min ZHANG

中国化学快报. 2001, 12(11): 943-944.

摘要 ( )

可视化

The substitution reaction between gem-diacetates and allylsamarium bromide was investigated, and homoallylic alcohol acetates were obtained in moderate to good yields.

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Selective Deoxygenation of Nitrones Mediated by Sm/CoCl₂6H₂O Reductive System

Ji Ming ZHANG, Yong Min ZHANG

中国化学快报. 2001, 12(11): 945-946.

摘要 ( )

可视化

In the presence of metallic samarium-cobalt (Ⅱ) chloride hexahydrate, the nitrones can be reduced to the corresponding imines in moderate to high yields under mild and neutral conditions.

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Formation of Benzyl Oxazole, A Competitive Path with the Classical Bishler-Napieralski Reaction

Zhan Zhu LIU, Ye Feng TANG, Shi Zhi CHEN

中国化学快报. 2001, 12(11): 947-950.

摘要 ( )

可视化

Several aromatic ring-substituted N-acetyl-phenylalanine methyl esters were treated with POCl₃ in refluxing benzene, which is the typical condition of B-N reaction. It was found that the normal B-N product 3, 4-dihydroisoquinoline-3-carboxylic acid methyl ester and/or 5-benzyl-2-methyl-4-methoxy oxazole could be obtained. The result depended mainly upon the electron-donating property of the substitutes on the benzene ring. Strong electron-donating groups located at para-or ortho-to the cyclization site will facilitate the formation of the normal B-N product 2. On the other hand, the absence or weak electron-donating groups tended to yield the oxazole product 3. It was established that the formation ofbenzyl oxazole is the competitive path with the B-N reaction. In this article, an explanation was given based on the mechanism of Bishler-Napieralski reaction.

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Synthesis of 5-Substituted Hexahydro-1H-1, 4-Diazepine Analogues

Jing Shan SHEN, Li Jun LEI, Hai Fang MAO, Jian Feng LI, Ru Yun JI

中国化学快报. 2001, 12(11): 951-954.

摘要 ( )

可视化

5-Substituted hexahydro-1H-1,4-diazepine analogues were synthesized starting from N, N'-dibenzyl-1, 2-ethylenediamine and methyl 2, 4-dibromide butyrate through nucleophilic substitution, reduction, chlorination, debenzylation and amidation. Bioactivity tests showed that 9a had the highest agonist activity.

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A Convenient and Stereospecific Synthesis of (Z) Benzylidenephthalides

Zhi Wei WANG, Shao Bai LI

中国化学快报. 2001, 12(11): 955-956.

摘要 ( )

可视化

A convencient and stereospecific synthesis of (Z)-benzylidenephthalides, including thunberginol F, from phthalides is described.

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A Facile Synthetic Approach to Two Chalcones

Zhen Ting DU, Shao Bai LI

中国化学快报. 2001, 12(11): 957-958.

摘要 ( )

可视化

A facile synthetic route for two chalcone analogues was developed. The key step was selective deprotection of MOM in aryl methyl ether 6 by silica gel.

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Synthesis of Pyridylazo-substituted Chromogenic Calix[4]arenes

Chuan Ming JIN, Guo Yuan LU, Xiao Zeng YOU

中国化学快报. 2001, 12(11): 959-960.

摘要 ( )

可视化

This letter reports a novel method for preparing chromogenic calix[4]arenes, in which the 4-aminopyridine was diazotized with isoamyl nitrite in EtONa/EtOH, and mono(azo)-, bis(azo)-and tetra(azo)-substituted calix[4]arenes were obtained as main product respectively by diazo-coupling in different molar ratio to calix[4]arene in non-aqueous solution at 0-5℃.

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Synthetic Study towards Taurospongin A: Wittig Olefination Approach to the Core Structure

Guang Rong ZHENG, Wei LU, Jun Chao CAI

中国化学快报. 2001, 12(11): 961-964.

摘要 ( )

可视化

An efficient, convergent and enantioselective synthetic approach to the trihydroxy core structure 2 of Taurospongin A 1 is described. The featured step is a classic Wittig coupling reaction between C1-C4 aldehyde segment 4 and C5-C10 phosphate salt segment (5).

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Synthesis and Characterization of Novel Dimethylgallium Complexes

Wu BI, Jin Qi ZHANG, Jing Zhi TIAN, Xi SHEN, Hui Xian ZOU

中国化学快报. 2001, 12(11): 965-966.

摘要 ( )

可视化

Two novel dimethylgallium complexes were synthesized and their structures were elucidated by elemental analysis, ¹H NMR, IR and MS spectra.

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Structural Characterization and Chemical Modification of a Glucan from Spores of Ganoderma lucidumi

Xing Feng BAO, Ji Nian FANG

中国化学快报. 2001, 12(11): 967-970.

摘要 ( )

可视化

A linear α-D-(1→3)-glucan, named PSG, was obtained from the spores of Ganoderma lucidum. The synthesis of positively and negatively charged polyelectrolytes from PSG was developed. Amine groups and carboxymethyl groups were introduced through nucleophilic substitution with 3-chloropropylamine or chloroacetic acid, respectively. Reaction conditions were varied to obtain insight into the influence of variables on the degree of substitution.

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The Reaction of CH³+NO in Gaseous Phase

Hui WANG, Zhou LU, Fan Ao KONG

中国化学快报. 2001, 12(11): 971-974.

摘要 ( )

可视化

Time-resolved Fourier transform infrared emission spectroscopy is employed for studing gaseous reaction of CH₃ with NO. The CH₃ radical was produced by laser photolysis of CH₃Br at 248 nm. The infrared emissions of vibrationally excited nascent products HCO (v₃), HCN (v₁, v₃), NH₂ (v₃), secondary product HNO (v₁) and possible product HNCO (v₁) were observed. It verifies that the reaction channels of HCO+NH₂ and HCN+H₂O exist, and that one other channel HNCO+H may also occur.

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Partial Oxidation of Methane Over the Perovskite Oxides

Wen Ling CHU, Jian Hua TONG, Wei Shen YANG, Li Wu LIN

中国化学快报. 2001, 12(11): 975-978.

摘要 ( )

可视化

Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-ä and Ba_0.5Sr_0.5Co_0.8Ti_0.2O_3-ä oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.

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Water-Soluble Metalloporphyrins as Mimics of Heme-containing Enzymes

Xiao Feng LI, Jian Yu LIU, Zhong Xian GUO, Yuan Zong LI, Ai Jin HUANG, Wen Bao CHANG

中国化学快报. 2001, 12(11): 979-982.

摘要 ( )

可视化

This letter compared catalase-, peroxidase-and cytochrome P450-1ike catalytic activities of 15 water-soluble metalloporphyrins produced from Fe, Mn and Co ions and 5 porphyrins. The metalloporphyrins with Fe and Mn as central ions show relatively high catalytic activities of catalase and peroxidase at pH 11.0. Only Mn-meso-tetrakis (4-N-methylpyridinium) porpho-phine of the 15 metalloporphyfins exhibits high cytochrome P450-1ike activity. Effects of imidazole on the catalytic reactions were also studied.

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The Energy Transfer Processes between Carotenoid and Chlorophyll Regulated by Electron Exchange Mechanism

Ye LI, Jing Quan ZHAO, Li Jin JIANG, Zhao Yong SUN, Xi Cheng AI, Xing Kang ZHANG

中国化学快报. 2001, 12(11): 983-986.

摘要 ( )

可视化

The energy transfer efficiency between carotenoids and chlorophyll depend on temperature and viscosity of the media. A 3.5 ps process was detected by the pico-second time-resolved spectra and the process was proved to be regulated by electron exchange mechanism.

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Studies on the Interactions between Potassium oxalato oxodiperoxovanadate and Histidine by NMR and MS

Jian Liang YE, Xing Wang ZHOU, Zhong CHEN, Zhi Wei CHEN, Pei Qiang HUANG

中国化学快报. 2001, 12(11): 987-988.

摘要 ( )

可视化

Multi-nuclear NMR and ESI-MS have been applied to study the interactions between oxalato-oxodiperoxovanadate and histidine in neutral solution. Coordination between the complex and histidine was monitored by ⁵¹V NMR. A pair of new isomers produced via vanadium atom binding separately to N1 and N3 of the imidazole ring of histidine was characterized by several spectroscopic methods. Experimental results show that the structure activity relationship of peroxovanadium complexes bearing organic ligands may be related to the specific recognition between peroxovanadium and histidine residue of tyrosine phosphatase.

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Voltammetric Studies of the Interaction of Tris (1, 10-phenanthroline) Cobalt (Ⅲ) with Bovine Serum Albumin

Li Ping LU, Bao Kang JIN

中国化学快报. 2001, 12(11): 989-992.

摘要 ( )

可视化

The voltammetric methods were used to prove the interaction of metal complex Co(phen)₃³⁺with bovine serum albumin (BSA). The interaction of BSA with Co(phen)₃³⁺molecules using BSA-modified electrode is described. Information of the binding ratio and interaction mode can be obtained from their electrochemical behavior and electrochemical data. Furthermore, attenuated total reflection infrared experiment was performed to prove the interaction between complexes and BSA.

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Immobilization of Glucoamylase onto Novel Porous Supports Containing Cyclic Carbonate

Jia Xian HUANG, Yan Li HUO, Yue LI, Zhi YUAN

中国化学快报. 2001, 12(11): 993-996.

摘要 ( )

可视化

Glucoamylase was immobilized onto novel porous polymer supports containing cyclic carbonate. The relationship between activity of immobilized glucoamylase and the properties of porous polymer supports was investigated. The operation stability and storage stability of immobilized glucoamylase were studied.

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Active Oxygen Radical Scavenging Ability of Water-Soluble β-Alanine C₆₀ Adducts

Tao SUN, Zhi Shen JIA, Wei Xiang CHEN, Ya Xu JIN, Zhu De XU

中国化学快报. 2001, 12(11): 997-1000.

摘要 ( )

可视化

Water-soluble β-alanine C₆₀ adducts were synthesized, and the scavenging ability to superoxygen anion radical O₂^-and hydroxyl radicalOH were studied by autoxidation ofpyrogallol and chemiluminescence, respectively. It was found that β-alanine C₆₀ adducts showed an excellent efficiency in eliminating superoxygen anion radical and hydroxyl radical. The 50% inhibition concentration (IC₅₀) for superoxygen anion radical and hydroxyl radical were 0.15 mg/mL and 0.048 mg/mL, respectively. The difference should be mainly attributed to the different scavenging mechanisms.

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Synthesis, Structure of a Symmetrically Substituted Stilbene with Strong Two-photon Absorption and Up-converted Blue Fluorescence

Xiao Mei WANG, Guang Yong ZHOU, Wen Tao YU, Min Hua JIANG

中国化学快报. 2001, 12(11): 1001-1004.

摘要 ( )

可视化

Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that this new crystal belongs to the triclinic crystal system of centro-symmetric P-1 space group. The DBPAS solution, with the linear transmission at wavelength of ≥450 nm, possesses large two-photon absorption cross section as high as 39.4×10^-48 cm·s/photon resulting in strong two-photon induced blue fluorescence of 460 nm, pumped by 740 nm laser irradiation.

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Measurement of Orotic Acid in Urine by Supercritical Fluid Chromatography

Ya Dong GUO

中国化学快报. 2001, 12(11): 1005-1006.

摘要 ( )

可视化

This work presents a simple, rapid and reliable supercritical fluid chromatography (SFC) method for a sensitive measurement of orotic acid in human urine. The samples were diluted with deionized water and analyzed directly without any pretreatment.

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Determination of Sparfloxacin in Human Urine by Reversed-Phase High Performance Liquid Chromatography With Nitrous Acid and Hydroiodic Pre-Column Derivatization

Li Ming DU, Zhe Feng FAN, Jin Li QIAO, Jing Ping WANG

中国化学快报. 2001, 12(11): 1007-1010.

摘要 ( )

可视化

Sparfloxacin can be oxidized by nitrous acid, then react with hydroiodic acid to form a fluorescent derivative. Based on this, a reversed-phase high performance liquid chromatographic pre-column derivatization new method is described for the determination of sparfloxacin in human urine. The linear range is 0.05 mg/L to 4.0 mg/L, the recoveries are 91.5%~95.7% and the RSD is 1.2%~4.2%. The results showed that this method is suitable for the determination of sparfloxacin in human urine.

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Ceramic Carbon/Polypyrrole Materials for the Construction of Bienzymatic Amperometric Biosensor for Glucose

Fa Ming TIAN, Lian De ZHU, Bo XU, Guo Yi ZHU

中国化学快报. 2001, 12(11): 1011-1014.

摘要 ( )

可视化

A novel amperometric glucose biosensor was constructed by electrochemical formation of a polypyrrole (PPy) membrane in the presence of glucose oxidase (GOD) on the surface of a horseradish peroxidase (HRP) modified ferrocenecarboxylic acid (FCA) mediated sol-gel derived ceramic carbon electrode. The amperometric detection of glucose was carried out at+0.16 V (vs. SCE) in 0.1 mol/L phosphate buffer solution (pH 6.9) with a linear response range between 8.0×10^-5 and 1.3×10^-3 mol/L of glucose. The biosensor showed a good suppression of inter- ference and a negligible deviation in the amperometric detection.

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Determination the Hydrogen Stored in Carbon Nanotubes by NO Titration Method

Shui Hua TANG, Li Zhen GAO, Bao Chun LIU, He LI, Bo Lan ZHANG, Liang Fu ZHANG, Zuo Long YU

中国化学快报. 2001, 12(11): 1015-1018.

摘要 ( )

可视化

A novel method was established to determine the H₂-storage capacity in carbon nanotubes. According to 2NO+2H₂ (or 4H)=N₂+2H₂O reaction, the H₂-storage capacity in carbon nanotubes could be calculated. The H₂-storage capacity in carbon nanotubes is at least 2.89 wt%.

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Estimation of Photoelectrocatalytic Activity of Titanium Oxide Film Electrodes by Ac Impedance

Wen Hua LENG, Zhao ZHANG, Shao An CHENG, Jian Qing ZHANG, Chu Nan CAO

中国化学快报. 2001, 12(11): 1019-1022.

摘要 ( )

可视化

In this paper, we demonstrated that the charge-transfer resistance of photoanode can be calculated through the analysis of its electrochemical impedance spectroscopy (EIS) and the photoelectrocatalytic degradation rate of aniline was inversely proportional to the value of charge-transfer resistance of photoelectrodes prepared by thermally oxidation on titanium. The value of charge-transfer resistance is smaller, the higher its photoelectro-activity is.

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Characteristics of AOT Microemulsion Structure: a Small Angle X-ray Scattering Study

Jun Cheng LIU, Gan Zuo LI, Bu Xing HAN

中国化学快报. 2001, 12(11): 1023-1026.

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可视化

The method of synchrotron radiation small-angle X-ray scattering (SR-SAXS) has been used to obtain structural ;nformation on the system of bis2(2-ethylhexyl) sulfosuccinate (AOT)/ H₂O/isooctane. By using the Guinier plot (Ln I (q) versus q² ) on the data sets in a defined small q range (0.03-0.06Å^-1), the gyration radius at different water/surfactant molar ratio, W₀, was obtained. With the increase of W₀, the gyration radius (R_g) increased at the range of 23.2~52.7 Å.

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SERS and RAIR for Molecular Structure of Phenylazonaphthalene terminated Self-Assembled Monolayer

Dong Hui ZHANG, Jian Ming ZHANG, De Yan SHEN

中国化学快报. 2001, 12(11): 1027-1028.

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可视化

The SAMs of 10-[4-(4-phenylazo)naphth-l-oxyl]-l-decanethiol (Compound 1) on gold were prepared. Their molecular structures were determined by surface enhanced Raman spectroscopy (SERS) and reflection absorption infrared spectroscopy (RAIR).

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Cross-linking Copolymerization of Acrylic Acid and Multi-armed Cross-linkers

Qiang CHEN, Ying GUAN, Xian Min ZHANG, Yu Xing PENG, Jian XU

中国化学快报. 2001, 12(11): 1029-1032.

摘要 ( )

可视化

The overall cross-linking copolymerization of acrylic acid and multi-armed cross-linkers are investigated by in situ interferometry. The results show that the more arms the cross-linkers have, the higher the polymerization rate is. However, they also mean the existence of less cross-linking efficiency and some defects in gel network.

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Polymerization of Styrene by Neutral Ni (Ⅱ) Acetylide Complex

Hong Mei SUN, Mu Jie YANG, Qi SHEN

中国化学快报. 2001, 12(11): 1033-1036.

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可视化

Neutral nickel σ-acetylide complex [Ni(C≡CPh)₂(PBu₃)₂] is a novel initiator for the polymerization of styrene in CHC1₃ over a range of polymerization temperature from 40℃ to 60℃. The polystyrene obtained was a syndio-rich atactic polymer and its weight-average molecular weight reached 279000. The mechanism of the polymerization was discussed and a radical mechanism was proposed.

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Hybrid Composite of Polyaniline Containing Carbon Nanotube

Jian Guo DENG, Xiao Bin DING, Yu Xing PENG, Albert S. C. CHAN

中国化学快报. 2001, 12(11): 1037-1040.

摘要 ( )

可视化

Carbon nanotube-polyaniline hybrid material was synthesized by emulsion polymerization in-situ. The morphology of hybrid material was studied by TEM and X-ray diffraction. The conductivity of nanocomposite increases with the increasing of carbon nanotube content because of the new conductivity passageways formed by carbon nanotubes.

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The Effect of the Chain Length on MMA Free Radicl Polymerization

Min WANG, You Gang MAO, Yan Ying LU, Ren Fei YANG, Fei LI, Jia Cong SHEN

中国化学快报. 2001, 12(11): 1041-1042.

摘要 ( )

可视化

In the polymerization process of methyl methacrylate (MMA), the Arrhenius parameters (activation energy and frequency factor) of propagating reaction monotonically decrease with increasing monomer conversion. At the beginning and middle stage of the propagating reaction, the increase of radical chain length is the main reason of above mentioned change. And at the end stage, the sharp decrease of k_p indicates that the activation energy is approximately incline to zero and the propagating reaction is controlled by molecular diffusion motion.

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Dioxygen Affinity and Catalytic Performance of Bis-(furaldehyde) Schiff Bases Co(Ⅱ) Complexes in Cyclohexene Oxidation

Bin SUN, Jun Ru CHEN, Jia Yuan HU, Xian Jun LI

中国化学快报. 2001, 12(11): 1043-1046.

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可视化

Oxygenation constants and thermodynamic parameters △H° and △S° of cobalt (Ⅱ) complexes with bis-(furaldehyde) Schiff bases (1, 2, 3, 4)were obtained by mearsuring saturated dioxygen uptake of these complexes in pyridine at different temperature. These complexes could activate molecular oxygen and were used as catalysts in cyclohexene oxidation. The influence of ligand structure on the dioxygen affinity and catalytic activity ofthe complexes were discussed.

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Mild Hydrothermal Synthesis and Optical Properties of the Complex Fluoride KMgF₃ Doped with Eu

Zhi Hong JIA, Hai Quan SU, Shou Hua FENG, Chun Shan SHI

中国化学快报. 2001, 12(11): 1047-1050.

摘要 ( )

可视化

KMgF₃ doped with Eu was synthesized by mild hydrothermal method at 240℃ for the first time. The excitation and emission spectra of the KMgF₃: Eu²⁺ phosphor were measured. Comparing with the sample synthesized through solid state reaction, the variation in the excitation spectra at 360 nm resulted from the existences of V_K color centers; the low emission intensity was due to Eu²⁺ having transferred part energy to V_K color centers.

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2001年, 第12卷, 第11期　刊出日期：2001-11-20

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本期目录

2001年, 第12卷, 第11期 刊出日期：2001-11-20

2001年, 第12卷, 第11期　刊出日期：2001-11-20