中国化学快报

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Studies on the Absorption of NO₂ by Polyethylene Glycol and the Oxidizing Properties of the Resulting Absorbent Product

Xue Sen FAN, Qing Zhi ZHANG, Xin Ying ZRANG, Sen Song ZHANG

中国化学快报. 1997, 8(09): 747-748.

摘要 ( )

可视化

PEG (polyethylene glycol.average molecular weight 300) is used as absorbent of NO₂.The absorption efficiency is found to reach up to 97%.The absorbing product,PEG·NO₂,can be used to cleave benzyl ethers mildly and selectively to benzaldehyde and corresponding fatty alcohols showing that PEG is a valuable oxidizing agent of benzyl ethers.As a carrier of NO₂,PEG can be recovered and utilized repeatedly after the oxidation.

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Application of an Organophosphorus Compound-DEPBT as Coupling Reagent in Liquid Phase Peptide Synthesis

Yan Nei HE, Yao LIN

中国化学快报. 1997, 8(09): 749-750.

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DEPBT,a novel coupling reagent containing phosphorus,was used in synthesis of pentapeptide Boc-Ile-Asn-Met-Trp (For)-Gly OMe by solution method.

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The Cyclization Reactions of Lawesson's Reagent with Bifunctional Substrates

Liang Nian HE, Fei CAI, Xiang Hua QIN, Kai LI

中国化学快报. 1997, 8(09): 751-754.

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The cyclization reactions of Lawesson's reagent(LR) with the substrates containing two functional groups such as hydroxy groups,amino groups,has been applied to prepare the O-P-O,N-P-N type 5-membered and 6-membered phosphorus heterocycles.The heterocyclizational possibility of LR with bifunctional compounds was also discussed.

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Condensation of Aromatic Aldehydes with Isopropylidene Malonate or 5,5-Dimethyl-1,3-cyclohexanedione without Catalyst

Dai Qing SHI, Yuan GAO, Lai Laong MU, Zai Sheng LU, Gui Yuan DAI

中国化学快报. 1997, 8(09): 755-758.

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The condensation of aromatic aldehydes with isopropylidene malonate or 5,5-dimethyl-1,3-cyclohexanedione is carried out by DMF as solvent without catalyst.

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Arylation of Allyl, Cinnamyl and Propargyl Bromide with Triarylbismuth Catalyed by Pd (0)

Xian HUANG, Jin Long WU

中国化学快报. 1997, 8(09): 759-762.

摘要 ( )

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Allyl and cinnamyl and propargyl bromide reacted under mild conditions with triarylbismuth under catalysis by Pd(0) to give 3-arylpropenes,1,3-diarylpropenes and arylpropadienes in modest to excellent yields.

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Photocatalytic C-H Bonds Activation:Ambient Carbonylation of Cyclohexane by Co (acac)₂ Under Ultraviolet Irradiation

Da Bin GAO, Jing Mei YIN, Ming GUO, Yuan YU, Yong An MA

中国化学快报. 1997, 8(09): 763-764.

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A high turnover number was achieved in the photocatalytic carbonylation of C-H bonds of cyclohexane catalyzed by Co (acac)₂ under ambient conditions (1 atm,25℃)to give mainly cyclohexanecarboxaldehyde.

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Studies on Retro-Michael Reaction of 1,5-Dicarbonyl Compounds

Jian Xin WANG, Tong Shuang LI

中国化学快报. 1997, 8(09): 765-768.

摘要 ( )

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The investigation of the scope and limitation of retro-Micheal reaction of 1,5-dicarbonyl compounds showed that the reaction worked well for 1,5-diketones and 1,5-ketoaldehydes but gave poor yield for 1,5-ketoesters and 1,5-ketoacids.

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A Study on Cycloacylation Related to Synthesis of Perylenequinones

Ya Jun ZHAO, Hui Tong TANG, Pang ZHANG

中国化学快报. 1997, 8(09): 769-772.

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可视化

3-(3,5-Dimethoxybenzyl)-5-hexenoic acid (13) could be cycloacylated by a variant consistion of treating its mixed formate anhydride with tin chloride to give a moderate yield of 3-allyl-6,8-dimethoxy-1-tetralone (24).Both allyl chains of unsaturated acid 13 and substituted tetralone 24 could be hydroxylated with concentrated sulfuric acid.These results make possible a study of synthesis of some natural perylenequinones and their stereochemistry.

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A New Approach to the Construction of Pyrrolizidine and Indolizidine Skeleton:Enantioselective Synthesis of (1S, 7aS)-1-hydroxypyrrolizidine and (1S, 8aS)-1-hydroxyindolizidine

Han Qing DONG, Zhi Cai SHI, Guo Qiang LIN

中国化学快报. 1997, 8(09): 773-776.

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可视化

A new approach to the construction of pyrrolizidine and indolizidine skeleton was described.By employing this cvclization method,the synthesis of (1S.7aS)-1-hydroxypyrrolizidine (1a) and (1S.8aS)-1-hydroxyindolizidine (1b) was achieved by treatment of the trimesylate 6a or 6b with aqueous ammonia in the presence of K₂CO₃ (or Cs₂CO₃) in one-pot fashion.

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Synthesis of the First Calixselenacrown

Xu Bo HU, Yuan Yin CHEN, Xue Ran LU

中国化学快报. 1997, 8(09): 777-778.

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The synthesis of a novel type of calixcrown 5,11,17,23-p-tert-butyl-25,27 dihy-droxy-26,28-(3',7'-diselena-5',5'-dimethylnonylene) dioxy-calix[4] arene is described.

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Synthesis and Crystallization of N-Benzoyl Tauryl Phenylalanine

Ya Li KONG, Sheng JIN

中国化学快报. 1997, 8(09): 779-780.

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The substrate hippuryl phenylalanine of carboxypeptidase A was selected as model to design new hapten molecule.N-Benzoyl tauryl phenylalanine (Ⅰ) was synthesized and its structure was characterized by X-ray crystallography method.

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A Total Synthesis of (±)-α-Chamigrene-3-one

Jin Jun WANG, Chang Jin YAO, Bing Zi CHEN, Gui Ji JIANG

中国化学快报. 1997, 8(09): 781-784.

摘要 ( )

可视化

The product,obtained by the photoaddition of terpinolene to methyl 2.4-dioxopentanoate.was subjected to cyclization to generate a spirocyclic compound having spiro[5.5] undecan structure,which was further transformed into α-Chamigrene-3-one by subsequent reactions.

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Conformational Analysis of Two Diosgenyl Saponins

Mei Zheng LIU, Chuan LI, Biao YU, Ming Bo CHENG, Chuan Li FENG, Yong Zheng HUI

中国化学快报. 1997, 8(09): 785-788.

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Diosgenyl α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside (1) and Diosgenyl α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranoside (2) were shown to be fascinating "facial amphiphiles" by conformational analysis based on NOE-MD method.

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Absolute Configurations of Tonkinin A and B:Two New Acetogenins from Uvaria Tonkinensis

Ying CHEN, De Quan YU

中国化学快报. 1997, 8(09): 789-790.

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可视化

The absolute stereochemistries of Annonaceous acetogenins.tonkinin A and B,have been established by the use of the convenient conversion to their formaldehyde acetal derivatives and the subsequent application of the Mosher ester methodology.

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Diterpenoid Alkaloids from Delphinium Tongolense

Lan HE, Xuan PAN, Bo Gang LI, Yao Zu CHEN

中国化学快报. 1997, 8(09): 791-792.

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可视化

The phytochemical investigation of Delphinium tongolense Franck.yielded two new diterpenoid alkaloids tongolenine C and tongolenine D.Their structures were elucidated by spectroscopical methods.

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Capillary Zone Electrophoretic Separation of Basic Proteins with Coated Columns Prepared by Sol-Gel Technology

Fang LI, Hui JIN, Ruo Nong FU, Jun Ling GU, Guang Ju LU

中国化学快报. 1997, 8(09): 793-796.

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可视化

Coated capillary columns were prepared by sol-gel technology and used in the separation of basic proteins with capillary zone electrophoresis.The results indicated that a significant decrease in protein adsorption was obtained and EOF was also diminished to zero in the pH range of 3-10.

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The Electrochemical Oxidation And Analytical Application Of Cholesterol

Man Dong GUO, Bang Ding FENG

中国化学快报. 1997, 8(09): 797-880.

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可视化

Cholesterol could be adsorbed on the surface of hanging mercury drop electrode,and gave a sensitive 2.5 order oxidative peak by anodic stripping procedure.The peak potential is-0.01v (Vs SEC).The peak current is linearly proportional to the cholesterol concentration in the range of 1.0×10^-5~1.0×10^-7mol/L.The dection limit is 5.0×10^-8 mol/L.In this paper,The electrode response mechanism of cholesterol has been studied,and the optimum experimental conditons have been found.This new method for determination of cholesterol has been applied to actual samples.

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β-Cyclodextrin Facilitates the Cleavage of Cobalt-Carbon Bonds during the Electrochemical Reduction of Alkylaquabis (dimethylglyoximato) Cobal (Ⅲ)

Ying CHEN, Lai Bin LUO, Hui Lan CHEN, Shi Min ZHU

中国化学快报. 1997, 8(09): 801-802.

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可视化

The electrochemical reduction of alkylaquabis(dimethylglyoximato) Cobalt (Ⅲ) in the absence and presence of β-Cyclodextrin (β-CD) was investigated by means of cyclic voltammetry.It was found that β-CD facilitates the cleavage of Co-C bond during the reduction process.

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Comparative Study on the Inclusion Complexation of Rutin with Cyclodextrin Supramolecules

Shao Min SHUANG, Jing Hao PAN, Si Yuan GUO, Miao Yan CAI, Chang Song LIU

中国化学快报. 1997, 8(09): 803-804.

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The interaction of β-cyclodextrin (β-CD),hydroxypropyl-β-CD and γ-CD with the drug rutin has been investigated by usingfluorimetry.The stoichiometry of the complexes and their formation constants have been estimated.The thermodynamic parameters for the formation of complexes were obtained.The complexing ability of HP-β-CD is remarkably stronger than β-CD and γ-CD.

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Mass Spectrometric Study of Clusters Produced by Laser Vaporization of Some Phosphates

Xiang Hong LIU, Xiao Guang ZHANG, Yue LI, Xiu Yan WANG, Nan Quan LOU

中国化学快报. 1997, 8(09): 805-806.

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The clusters generated by direct laser vaporization of KH₂PO₄ and Cu₃(PO₄)₂ samples are studied by a TOF mass spectrometer.It is found that mainly the[K(KPO₃)_n] cluster series is generated from KH₂PO₄ sample and it demonstrates obvious magic numbers,which are n=3,6,9,12,15.Direct laser vaporization of Cu₃(PO₄)₂ sample produced[Cu(CuPO₃)_n] cluster series as well as other series with the same building block of (CuPO₃).

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Photorefractive Effect in Poly (N-vinylcarbazole)-Based Composite Sensitised by C₆₀

Zhi Jie ZHANG, Yi Wang CHEN, Yuan Kang HE, Hui Ying CHEN, Zhi Jian CHEN, Shu Feng WANG, Qi Huang GONG

中国化学快报. 1997, 8(09): 807-810.

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A new PVK-based photorefractive polymer composite sensitized by C₆₀ and doped with a higher content of EO chromophore was prepared.The high optical quality thin-film was formed between two ITO-covered glass electrodes.Two-beam-coupling (2BC) experiment was performed by using a He-Ne laser (at wavelength 632.8nm),and an obvious photorefractive performance was observed.The dependence of two-beam-coupling gain coefficient on the applied poling dc electric field was measured.

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Synthesis of a Novel Copper Phthalocyanine-Fullerene Dyad

Wen Feng QIU, Yun Qi LIU, Cai Yuan PAN, Dao Ben ZHU

中国化学快报. 1997, 8(09): 811-814.

摘要 ( )

可视化

A new copper phthalocyanine-fullerene dyad (CuPc-C₆₀) was synthesized by Diels-Alder adduct of corresponding CuPc and C₆₀.The chemical structure of this compound was characterized by elemental analysis,MS,IR,UV-VIS and NMR.

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The Synthesis and Film Forming Properties of Unsymmetrical Phthalocyanine Bearing One Crown Ether Void

Xi You LI, Guo Xiang XIONG, Hui Jun XU

中国化学快报. 1997, 8(09): 815-818.

摘要 ( )

可视化

The synthesis of phthalocyanines bearing one crown ether macrocycle and three alkoxyl chains is described.They form stable monolayers and can be employed for the preparation of multilayer films by the Langmuir-Blogett technique.The orientations of the molecules in the film were affected by alkali metal ions in the subphase.It is suggested that a kind of "sandwich" dimer was formed in the film induced by potassium ions.

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Synthesis and Structure of 3-Trichlorostannylpropionate Complexes with Dibutylsulfoxide and Pyridine Oxide

Lai Jin-TIAN, Bin ZHAO, Zheng Yu ZHOU, Wen Tao YU

中国化学快报. 1997, 8(09): 819-820.

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A series of 3-trichlorostannylpropionate complexes with dibutylsulfoxide and pyridine oxide were synthesized by transesterification reaction and characterized by means of elemental analysis,IR,NMR (¹H,¹³C) and X-ray single crystal diffraction.

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Studies on the Phase Behavior of Lyotropic Liquid Crystal in DAD/C₄OH/n-C₈H₁₈/D₂O System

Qiang SHEN, Gan Zuo LI, Cheng Song MA, Yan Zhang HUANG

中国化学快报. 1997, 8(09): 821-824.

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The lytropic liquid crystals in dodecanic acid diethanolamine (DAD)/n-butanol (C₄OH)/octane (n-C₈H₁₈)/deuteron (D₂O) system were studied to determine the phase regions and were investigated by ²H-NMR spectroscopy,optical polarizing microscope and small-angle X-ray diffraction (SAXD) methods.The results indicate that the lamellar,hexagonal and cubic liquid crystals all exist in the above system.Keeping the weight ratio of DAD and C₄OH constant,the microphase structure,²H quadruple splitting and the interlayer spacing are all changed with the addition of deuteron.

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Physical Diffusion and Electron-transfer Dynamics of Electroactive Solutes in Polymer Electrolytes Ⅰ. Effect of the Nature of Electroactive Solutes

Li Ming DING, Hua Fang ZHOU, Zhong SHI, Shao Jun DONG

中国化学快报. 1997, 8(09): 825-828.

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The diffusion coefficients(D_app) and the heterogeneous electron-transfer rate constants(k_s) for ferrocene and its seven derivatives in MPEG/LiClO₄ electrolyte were determined by using steady-state voltammetry.The two parameters increase with increasing temperature,indicating Arrhenius behavior.The effects of the nature of electroactive solute molecules on D_app,k_s,and the half-wave potentials(E_1/2) are discussed.

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Is There any Hexazirconium Cluster in the Compounds [HP(t-Bu)₂Ph₂]3[Zr₂Cl₂H₅] and Zr₆Cl₁₄(PPr₃)₄H₄?

Wen LI, ChunHua HU, Pei Ju ZHENG

中国化学快报. 1997, 8(09): 829-830.

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The [Zr₆(μ₂-Cl)₁₂Cl₆H₄]^3- ion with C_4v symmetry in the title compounds has been calculated by DV-Xα program.The calculated results show that there is almost no available covalence bonding between zirconium atoms and significant Zr 4d AO compositions in the MOs.but there are much stronger Zr-Cl(bridging) bonding.All analysis results suggest that these compounds would be the cluster with Zr₆Cl₁₂cage linked by Zr-Cl bridging bonding plus six Cl terminal ligands rather than the hexazirconium cluster in view of the chemical bonding.

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Scanning Tunneling Microscopic and Scanning Tunneling Spectroscopic Studies of Nanocrystalline CdSe Thin Film

Yuan LIN, Rui Feng LIN, Xiao Wen Zhou, Jing Bo Zhang, Xu Rui Xiao

中国化学快报. 1997, 8(09): 831-832.

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Nanocrystalline CdSe thin film prepared by chemical solution deposition was imaged in air with a scanning tunneling microscope (STM).Scanning tunneling current spectroscopy(STS) was taken at a fixed tip-sample separation.Tunneling current (i)-voltage(v) curve and differential conductance spectrum show an n-type schottky rectifying behaviour and yield a direct measure of band gap energy.An increase of bandgap energy (1.8-2.1eV) was measured indicating energy quantization of this particular thin film.

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Synthesis of ZSM-35 Using Hexamethyleneimine as a Template

Zhong Yong YUAN, Huai Bin ZHANG, Jing Zhong WANG, He Xuan LI

中国化学快报. 1997, 8(09): 833-836.

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可视化

Zeolite ZSM-35 was synthesized using hexamethyleneimine as an organic template and its crystallographic structure was studied by X-ray diffraction and IR spectroscopy.Its adsorption property was also evaluated.

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Determination of the Atomic Weight of Germanium

Tsing Lien CHANG, Guang Sheng QIAO

中国化学快报. 1997, 8(09): 837-840.

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可视化

The atomic weight of germanium was determined as A_r (Ge)=72.6284 (22).Application of substitute calibration using the true isotopic ratio of Ga_69/71 results in A_r(Ge)=72.6389 (29),both on 2σ basis.

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1997年, 第8卷, 第09期　刊出日期：1997-09-20

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1997年, 第8卷, 第09期 刊出日期：1997-09-20

1997年, 第8卷, 第09期　刊出日期：1997-09-20