中国化学快报

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Oxidative Cyclization of Azo-coupling Products of 3-Isopropenyltropolone and 3-Cinnamoyltropolone with Bromine

Wen Tao GAO, Shu Fen ZHANG, Jin Zong YANG

中国化学快报. 1999, 10(01): 1-4.

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A new method to synthesize heterocycle-fused troponoid compounds by oxidizing azocoupling products of 3-isopropenyltropolone and 3-cinnamoyItropolone with bromine in the presence of pyridine was reported for the first time. Reaction of azo-couping products of 3-isopropenyl tropolone la~f and 3-cinnamoyltropoIone 3a-d with excess bromine afforded heterocycle-fused troponoid compounds 2a-f, 4a-d, respectively.

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Condensation Reaction of α-Aroyl-α-acetyl Ketene Cyclic Dithioacetals with Aromatic Aldehydes

Zhong Wei XIE, Qun Xin FANG, Yu Lan HU, Met Xin ZHAO, Dong YU, Qun LIU

中国化学快报. 1999, 10(01): 5-6.

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The title compounds 3 and 4 condensed with aromatic aldehydes to give α-aroyl-α-cinnamoyl ketene cyclic dithioacetals 5 and 6 with sodium ethoxide as the base. The stereochemistry of 5 and 6 was assigned as E-configuration by ^lH NMR.

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Reductive Cleavage of S-S Bond by Samarium Diiodide:Synthesis of β-Thioesters and β-Thionitriles

Hua Jiang JIANG, Yong Min ZHANG

中国化学快报. 1999, 10(01): 7-8.

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The reduction of disulfides by samarium diiodide led to sa arium thiolates (ArSSmI₂). This new thiolate anion species reacted smoothly with α, β -unsaturated esters (nitriles) to give 1, 4-addition products β -thioesters and β -thionitriles in good yields under mild and neutral condition.

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The Synthesis of Tertiary Amides by the Reaction of Adducts of Schiff Bases and Acyl Chlorides with Allylsamarium Bromide

Ming Xin YU, Yong Min ZHANG

中国化学快报. 1999, 10(01): 9-10.

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Adducts of Schiff bases and acyl chlorides react with allylsamarium bromide to afford the corresponding tertiary amides.

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Acyldesilylation of 5-Trimethylsilyl-2-furancarboxaldehyde

Hu Ri PIAO, Zhe Shan QUAN, Kouji NAKAYAMA, Akira TANAKA

中国化学快报. 1999, 10(01): 11-12.

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Acyldesilylation of 5-trimethylsilyl-2-furancarboxaldehyde with acyl chlorides was investigated and the unexpected 5-acyl-2-dichloromethylfuran were obtained as main products. The expected 5-acyl-2-furancarboxaldehydes were also found after hydrolyzing of the corresponding dichloro-compounds.

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A Novel Nucleophilic Substitution of 3-Halo-6-phenoxypyridazines

Kang Tat REN, Hut Ying LI, Jun QI, Hong Hai SONG, Xiang WANG, Hua Zheng YANG

中国化学快报. 1999, 10(01): 13-14.

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A novel nucleophilic substitution of pyridazines is found, in which phenoxy group is dislodged rather than the halogen atom, on treating 3-haIo-6-phenoxypyridazines with alkoxy anion. The reactivity of substituents on benzene ring and the halogen atom of pyridazines are studied. Reasonable explanation based on the quantum chemical calculations are given.

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Synthesis of Long-Chain Spirobenzopyrans Bearing a Monoazacrown ether

Sheng Hua LIU, Cheng Tat WU

中国化学快报. 1999, 10(01): 15-16.

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Two new long-chain spirobenzopyrans and their crowned derivatives were designed and synthesized.

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Nickel (Ⅱ) Complex Catalyzed Conjugate Addition Reaction of Functionalized Organozinc Reagents to α,β-Unsaturated Esters

Yu Lai HU, Jian Hua YU, Shi Yan YANG, Yuan Qi YIN, Jin Xian WANG

中国化学快报. 1999, 10(01): 17-18.

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Functionalized organozinc reagents can easily under 1, 4-addition reaction with unsaturated esters in the presence of catalytic amount of Ni (acac)₂ and tertiary amines under very mild conditions to give the products in excellent yields.

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A Convenient Synthesis of β-Ketosulfoxides

Bet ZHAO, Jian Ping ZOU, Cheng Rong LU, Qi GU, Zhong E LU

中国化学快报. 1999, 10(01): 19-20.

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β-Ketosulfoxides were synthesized by the reaction of acetone with aryl sulfinate esters in the presence of hydrochloric acid and the structure of title compounds were finally confirmed by IR, ¹HNMR and ¹³CNMR spectra.

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The Synthesis of 3-(2'-Hydroxybutyl) isobenzofuran-1 (3H)-one

Guo Xin WANG, Guo HSO XIE, Yuan Liu WU, Xin Fu PAN

中国化学快报. 1999, 10(01): 21-22.

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The synthesis of 3-(2'-hydroxybutyl) isobenzofuran-1 (3H)-one 1 from phthalic anhydride via the intermediate 3-(2'-oxoethyl) isobenzofuran-1 (3H)-one 6 was described.

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Synthesis and Steric Structure of 1, 5-Benzothiazepine-Phenyl-β-Lactams

Yuan LI, Jian Dong SHI, Yuan Jing ZHANG, Sheng JIN, Qi Yi XING

中国化学快报. 1999, 10(01): 23-26.

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1, 5-Benzothiazepines 1 react with phenylacetyl chloride to give the title compounds. The structures of these new compounds were confirmed by elemental analysis, ¹H NMR, ^l3C NMR and MS spectroscopy, and their configuration (the mutual positions of the substituents relative to the β-lactam ring) and conformation of the compounds were determined by X-ray crystal analysis.

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Prediction, Synthesis and Antigenicity of the Antigenic Peptides of 26kDa Glutathione S-Transferasc of Schistosoma Japonicum (Sj26)

Jia Xi XU, Meng Shen CAI

中国化学快报. 1999, 10(01): 27-28.

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Six antigenic peptides of 26 kDa glutathione S-transferase of Schistosoma japonicum (Sj26) have been predicted according to their hydrophilicity. flexibility, accessibility, charge distribution and β -turn in the secondary structure by the determination of its primary structure and synthesized by solid phase method. All of them showed antigenicity with anti-schistosoma japonicum immunoglobulin polyclonal antibody, anti-Sj-IgG PcAb by Dot-ELISA. Three of them showed good antigenicity. They would serve as candidates of synthetic anti-schistosomal vaccine.

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A New Sesquiterpene from Ligularia Songarica

Bo FU, Xiu Ping YANG, Jie WANG, Zhong Jian JIA

中国化学快报. 1999, 10(01): 29-30.

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A new bisabolane sesquiterpene, 5β-acetoxy-4β, 8- diangeloyloxy-2β, 3β,:10, 11-diepoxy-bisabola-7 (14)-ene, was isolated from the roots of Ligularia songarica and its structure was elucidated on the basis of spectroscopic methods, especially 2D-NMR techniques.

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Two new diterpenoids from Isodon eriocalyx

Neng Yu CHEN, Min Qing TIAN, Rut WU, Han Dong SUN, Chao Ming LI, Zhong Wen LIN

中国化学快报. 1999, 10(01): 31-32.

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Two new diterpenoids, maoecrystal U and epi-maoecrystal P were isolated from the leaves of Isodon eriocalyx. Their structures were determined as 6β-acetoxy-15β-hydroxy-3α, 20epoxy-enf-kaur-16-ene-1, 7-dione 1 and 16 (s)-methoxymethyl-6β, 7β-dihydroxy-7α, 20-epoxy-ent-kaur-2. 3-ethenylene-l. 15-dione 2 respectively, by spectroscopic methods.

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Diacylated Triterpenoid Saponin from Silene szechuensis

Cheng ZOU, Jia Xiong JIANG, Chang Xiang CHEN, Jun ZHOU, Qing ZHAO

中国化学快报. 1999, 10(01): 33-36.

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A new triterpenoid saponin, named silenoside, with sugar chains esterified by two different acyl groups was isolated from Silene szechuensis. Its structure was elucidated by chemical and spectral methods.

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A New Lignan Glucoside from Lancea tibetica

Bao Ning SU, Cheng Shan YUAN, Zhong Jian JIA

中国化学快报. 1999, 10(01): 37-38.

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A new 7-9'-monoepoxy tetrahydrofuran type lignan glucoside with the cis-relationship of H-7 and H-8, named tibeticoside A 1, was isolated from the medicinal whole plants of Lancea tibetica. Its structure was elucidated by spectroscopic methods and chemical transformation.

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Separation of chiral drugs with sulfobutylether-β-cyclodextrin by capillary zone electrophoresis

Jun Ying LIU, Yi Yang DONG, Tian Song WANG, Hu Wei LIU, Al Jin HUANG, yi Liang SUNI, Zeng Pei SUN

中国化学快报. 1999, 10(01): 39-42.

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Sulfobutylether-β-cyclodextrin (SBE-β-CD) was used as a chiral selector for separating ten chiral drugs with resolution ≥ 1.2 by capillary zone electrophoresis (CZE), The background electrolyte solution comprised of 120 mmol/L Britton-Robinson buffer (BRB) containing 1~10 mmol/L SBE-β-CD with the pH value adjusted from 5.0~6.8. Five of the drugs were better resolved than those previously reported with neutral CDs.

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Taxayuntin I from Taxus Yunnanensis

Jin Yun ZHOU, Pei Ling ZHANG, Wei Ming CHEN, Qi Cheng FANG

中国化学快报. 1999, 10(01): 43-44.

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Taxayuntin I, a new 11 (15->l)abeotaxane, was isolated from the leaves and stems of Taxus yunnanensis. Its structure was elucidated on the basis of spectroscopic data.

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A Good GC Stationary Phase for Separation of Xylene Isomers

Ting ZHANG, Jiang Hua HAN, Ruo Nong FU, Jian ZHANG

中国化学快报. 1999, 10(01): 45-46.

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An excellent separation of xylene isomers is reported using 2, 6-0-di-pentyl-3-0-acetyl- β -CD as capillary stationary phase. The optimum conditions for the separation are also discussed.

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Powder Microelectrodes Applied to NO₂^- Detection

Jia Wei YAN, Jun Tao LU, Pei Fang LIU

中国化学快报. 1999, 10(01): 47-50.

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The reduction of nitrite at Au or carbon electrode in H₂SO₄ was found to follow a chemical-electrochemical (CE) mechanism with a very thin (4x10^-8 cm) preceding reaction zone. It was proposed and experimentally verified that for such kind of electrode processes the total reaction rate could be effectively enhanced by using electrodes with increased true surface area, such as porous electrodes. As a combination of porous electrode and microelectrode, the powder microelectrode shows excellent performance for nitrite detection.

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A Highly Sensitive Kinetic Spectrophotometric System and Its Analytical Potential for Chromatographic Detection of Metal Ions

Xi Rong HUANG, Wen Juan ZHANG, Shu Hua HAN, Gui Ying XU

中国化学快报. 1999, 10(01): 51-54.

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Based on the inhibitory effect of metal ions on the decolourization reaction of a dye taking place in a mixed micellar medium, a differential rate method was developed for the detection of metal ions. The present kinetic spectrophotometric system has several advantages due to introduction of the mixed micelles.

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Studies on Human Immunoglobulin G from GBS Patient (Ⅲ)-The Determination of Molecular Weight of Human Immunoglobulin G by Capillary SDS Gel Electrophoresis

Qin Hua RU, Yi Ming WANG, Guo An LUO

中国化学快报. 1999, 10(01): 55-58.

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Guillain-Barre syndrome (GBS) is considered to be an autoimmune disorder of peripheral nervous system. In this paper, capillary SDS gel electrophoresis was performed on neutral coated fused-silica capillary to determine the molecular weight of purified IgG samples from GBS patient.

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Fluorescence Spectra of the Poly (N-vinylcarbazole) Obtained with Asymmetric Polymerization

Chuan Fu CHEN, Quan SU, Yong Ming CHEN, Fu XI

中国化学快报. 1999, 10(01): 59-62.

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The fluorescence spectra of the poly (N-vinylcarbazole) in solution obtained with chirally organic salts or acid as catalyst or initiator[(-)Sp:(-)-Sparteine, (+)CSA:D- (+)-Camphor-10-sulfonic acid)], respectively, have been investigated. It is found that the two emission peaks at the longer wavelength (λmax,ca, 415nm) and the shorter wavelength (λmax,ca,370nm) are assigned to the sandwich excimer and second excimer (partial overlap) fluorescence, respectively. The sandwich excimer and partially overlapped excimer are attributed to a fully overlapped structure of neighbouring carbazole chromophores in a totally elipsed conformation of the isotactic sequence, and partially overlapped structure of the syndiotactic sequence. The estimated values of I_4l5/I₃₇₀ and isotactic sequence content by using the fluorescence spectra are in the order:(-)Sp⁺ (+)CSA > (+)CSA > (-)Sp⁺C10₄^- (no peak at 415nm for AIBN).

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Electropolymerization of 4-Aminothiophenol Self-Assembled Monolayer on Au Electrode

Qing Ji XIE, Xiao Lan GU, You Yu ZHANG, Man Cai XU, Ming MA

中国化学快报. 1999, 10(01): 63-66.

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In this letter, vve report that oxidation of 4-aminothiophenol self-assembled monolayer on Au electrode produces a couple of redox current peaks with close peak potentials in 0.5 mol/L HCIO₄ aqueous solution, and the peaks are ascribed to an electroactive monolayer. Electrochemical properties of the monolayer polymer were investigated with use of electrochemical quartz crystal microbalance and cyclic voltammetry.

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Electrochemical Properties of Poly (ethyl acrylate-co-lithium methacrylate) Latex Film Solid Electrolyte

Yong Hong WU, Zheng Hua DENG, Guo Xiang WAN

中国化学快报. 1999, 10(01): 67-68.

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Poly (ethyl acrylate-co-lithium methacrylate) (PEM) latex film was synthesized by emulsion-free polymerization. The electrochemical window of plasticized PEM latex film is exceeding 5.0 V. LiCo0₂/Li battery with PEM latex film as electrolyte exhibits excellent reversibility and when the discharge current density is 0.3 mA/cm², the specific discharge capacity achieves 4.4 mAh/cm².

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Making High Selective Molecule Imprinting Polymer (MIP) In Polar Solvent

Zi Hut MENG, Liang Mo ZHOU, Jing Fang WANG, Qing Hat WANG, Dao Qian ZHU

中国化学快报. 1999, 10(01): 69-72.

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Acrylamide was used as functional monomer to make high chiral selective molecule imprinting polymers against N^α-protected amino acid in polar solvent. The factor, which influence the efficiency of the polymer and the mechanism of chiral recognition were investigated.

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In Situ Acquisition of Equivalent Circuit Parameters of Crystal Resonance during Copper Deposition and Dissolution in Acidic Solution by Electrochemical Quartz Crystal Impedance System

Qing Ji XIE, Xiao Lian SUN, Xiao Lan GU, Hong Wei LIU, You Yu ZHANG, Shou Zhuo YAO

中国化学快报. 1999, 10(01): 73-76.

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Electrochemical quartz crystal impedance system (EQCIS) which allows in situ dynamic quartz crystal impedance measurement in an electrochemical experiment was developed by combining an HP 4395A Network/Spectrum/Impedance analyzer with an EG&G M283 potentiostat. Equivalent circuit parameters of crystal resonance change significantly during electrodeposition and dissolution of copper in 0.1 mol/L H₂S0₄ aqueous solution in a cyclic potential sweep experiment, which is explained with an overall picture of mass loading, solution density and viscosity, etc.

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Synthesis of Polymer-Bonded Carbonyl Ruthenium (Ⅱ) and Osmium (Ⅱ) Porphyrins

Zao Ying LI, Cong LI, Jiang Lin LIANG, Kun YAN

中国化学快报. 1999, 10(01): 77-78.

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The reactions of 5- (p-hydroxyphenyl)-lO, 15. 20-tris (p-methoxyphenyl) porphyrin (H₂Por) 1 respectively with triruthenium dodecacarbonyl[Ru₃ (CO)₁₂] and triosmium dodecacarbonyl[Os₃ (CO)₁₂] under N₂ gave complexes 2 and 3. Treatment of 2 (and 3) with Memfield' peptide resin gave 4 (and 5) respectively.

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Dioxygen Affinities and Catalytic Epoxidation Performance of Transition-Metal Hydroxamates

Hua YANG, Sheng Ying QIN, Xiao Xia LU

中国化学快报. 1999, 10(01): 79-82.

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The dioxygen affinities and catalytic epoxidation performance of transition-metal hydroxamates were investigated for the first time. The effects of substituents on these properties were also discussed in the paper.

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Ag-ZSM-5 Catalyst for the Catalytic Decomposition of NO

Jia Wei TENG, Tian Xi CAI, Xin He BAO

中国化学快报. 1999, 10(01): 83-86.

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The catalytic decomposition of NO over Ag-ZSM-5 catalyst prepared by ion-exchange was investigated. The exchanged silver in the zeolite was reduced and it collected in the course of the reaction to form silver particles of about 20 nm. The catalytic reaction induced a pronounced restructuring of the Ag particles through preferential formation of the (111) facets. These facets were shown to bind a tightly bound oxygen species (0_Y). The O_Y species occupies the active sites for NO adsorption resulting in catalyst deactivation. It could be removed by appropriate reducing agents, such as CO, to recover the active sites at elevated temperatures.

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Lead (Ⅱ) Binding to Thionein

Wei Guo HE, De Ying CHU, Jing Yue YANG, Dan Feng YAO, Mei Cheng SHAO

中国化学快报. 1999, 10(01): 87-90.

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Lead (Ⅱ)-binding properties of rabbit liver thionein 2 (apo-MT2) have been studied. Two kinds of complexes, Pb₇-MT and Pb₇-MT', are observed upon the binding of Pb²⁺ to apo-MT at different pH. From their characteristic peaks in UV and CD spectra, it is deduced that Pb²⁺ in Pb₇-MT is coordinated by four sulfhydryl groups in Td microsymmetry, while multiple coordination types including two-coordination maybe present in Pb₇-MT'.

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The Influence of Bond Valence on Bond Covalency in RMn₂O₅ (R=La, Pr, Nd, Sin, Eu)

Zhi Jian WU, Si Yuan ZHANG

中国化学快报. 1999, 10(01): 91-94.

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The relationship between bond valence and bond covalency in RMn₂0₅ (R=La, Pr, Nd, Sm, Eu) has been investigated by a semiempirical method. This method is the generalization of the dielectric description theory of Phillips, Van Vechten, Levine and Tanaka scheme. The results indicate that larger valences usually result in higher bond covalencies, in good agreement with the point that the excess charge in the bonding region is the origin of formation of bond covalency. Other factors, such as oxidation state of elements, only make a small contribution to bond covalency.

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1999年, 第10卷, 第01期　刊出日期：1999-01-20

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1999年, 第10卷, 第01期 刊出日期：1999-01-20

1999年, 第10卷, 第01期　刊出日期：1999-01-20