中国化学快报

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Cyclopropanation of 1, 1-Dichloro-4-methyl-1,3-pentadiene with Diazoacetate

Zheng Ning LI, Zhi Xiu XU, Hui Lin CHEN, Zhuo ZHENG, Yun XU, Xin Quan HU

中国化学快报. 1997, 8(07): 559-562.

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Several cyclopropanation catalysts for the synthesis of 3 (2,2-dichlorovinyl)-2,2.dimethylcyclopropanecarboxylates have been studied in this paper.Owing to electron deficiency of 1,1-dichloro-4-methyl-1,3-pentadiene,yield of this reaction is rather low compared with that of 2,5-dimethyl-2,4-pentadiene.Of all catalysts concerned,yield ranged from 25.1% to 47.2%.

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Intermolecular [4+3] Cycloaddition of Cyclic Oxyallyl

You Hong HU, Dong Lu BAI

中国化学快报. 1997, 8(07): 563-564.

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可视化

The [4+3] cycloaddition of the 6-substituted-2-chlorocyclohexanone and furans under the Fohlish conditions (Et₃N in CF₃CH₃OH) has been accomplished to give tricyclic cycloadducts with good yields.

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Addition of Per(poly) fluoroalkyl Iodides to vinyl Cyclopropane Derivatives:Synthesis of Fluoroalkyl Substituted γ, δ-Unsaturated Carbonyl Compounds

Qiao Sheng HU, Chang Ming HU

中国化学快报. 1997, 8(07): 565-568.

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可视化

In the presence of CrCl₃/Fe bimetal couple,per(poly) fluoroalkyl iodides add to vinyl cyclopropane compounds giving addition-ring-opening products in good yields.

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Synthesis of Schiff Base Type Macrocycles Containing Naphthalene Ring

Chang Rong NIU, Hai Ning ZHANG, Cheng Tai WU

中国化学快报. 1997, 8(07): 569-572.

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A series of new Schiff base type macrocyclic crown ethers containing naphthalene ring were synthesized from 2,2'-di(o-formylnaphthoxy) ethyl ether or 1,2-di(o-formylnaphthoxy)ethane and four appropriate diamines.The chemical structures of the new compounds were characterized by elemental analysis,infrared spectra,nuclear magnetic resonance spectra and mass spectrometry.

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A Simple and Efficient Procedure for the Preparation of O-aryl-O-ethyl-S-allyl Thiolophosphates

Li Ming HU, Zan Kai YAN, Wei Bin CHEN, Zhao Jie LIU

中国化学快报. 1997, 8(07): 573-576.

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可视化

The thiono-thiolo allylic rearrangement of O-allyl-O-aryl-O-ethyl thionophosphates(1a-j) adsorbed on SiO₂ afforded the corresponding O-aryl-O-ethyl-S-allyl thiolophosphates (2a-j) in good yields.

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Synthesis of 1,2,3,4-Tetrahydro-1-Indolizinones and 3-Methyl-1,2-dihydro-1-Pyrrolizinones

Ji Yun LIU, Shou Fang ZHANG

中国化学快报. 1997, 8(07): 577-578.

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4-(1-Pyrrolyl) butanenitrile (4),the key intermediate for the synthesis of 1,2,3,4-tetrahydro-1-indolizinone,was prepared with Clauson-Kass reation.When pyrrole reacted with 4-bromobutanenitrile in PEG-400 dimethyl ether catalyzed by NaOH,3-(1-pyrrolyl) butanenitrile was obtained.The nitrites were converted into the corresponding ketones by Hoesch reaction.Some of the ketone derivatives were prepared.

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A Novel Calix [4] arene Having Long-Chain Monoalkenyl at The Upper Rim

Xue Ran LU, Xing Hua TANG, Shu Ling GONG, Yuan Yin CHEN

中国化学快报. 1997, 8(07): 579-582.

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5-1',1'-dimethylundecenyloxyphenylmethyl-11,17,23-tris-1",1"-dimethylethyl-25,26,27,28-tetrahydroxycalix [4] arene was synthesized from 1,1-dimethylundecenyoxylphenyl-methylphenol (3) and bishydroxymethylated p-tert-butylphenol-formaldehyde trimer (7) (3-[3-[3-(Hydroxymethyl)-5-tert-butylsalicyl-5]-tert-butylsalicy]-5-tert-butyl-2-hydroxybenzyl Alcohol) by ‘1+3’ fragment condensation in dioxane with TiCl₄ as condensation agent in 28% yield.It is the first long-chain monoalkenyl substituted calix [4] arene in which the alkenyl was attached to the upper rim of calix [4] arene.

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Synthesis of 2-Fluoroalkylated Tetrahydrofuran Derivatives from Ethyl α-Fluoroalkylacetates

Bing Hao LUO, Hui Ping GUAN, Quan Fu WANG, Chang Ming HU

中国化学快报. 1997, 8(07): 583-586.

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Ethyl α-(2-alkenyl)-α-perfluoroacylacetates (4) are synthesized from the reaction of ethyl α-perfluoroalkylacetates with allylic alcohols in the presence of the mixed base of triethylamine and sodium dicarbonate.lodoenoletherification of the compounds 4 afforded 2-fluoroalkylated tetrahvdrofuran derivatives 5 under the improved conditions.The possible reaction pathways are suggested.

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Synthesis of Novel Polypyridine Ligands

Bing Wen JING, Man Hua ZHANG, Tao SHEN

中国化学快报. 1997, 8(07): 587-590.

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Some novel polypyridine ligands containing adsorbing groups were synthesized with the purpose of developing new ruthenium(Ⅱ) polypyridine complexes to be used in solar cell based on dye-sensitized nanocrystilline TiO₂ film electrode.

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A New Route to S-(-)Zearalenone

Zhi Qin WANG, Shi Ka TIAN

中国化学快报. 1997, 8(07): 591-594.

摘要 ( )

可视化

A concise synthesis of naturally occurring S-(-)-zearalenone has been described.

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The First Total Synthesis of Five Elegan Type Natural Products

Jing LI, Jiong LAN, Zuo Sheng LIU, Yu Lin LI

中国化学快报. 1997, 8(07): 595-598.

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The first total synthesis of five linear diterpenes:eleganolone (1),eleganolone acetate (2),elegandiol (3),eleganonal (4) and epoxyeleganolone (5),was achieved from (E,E)-farnesol (6) via 4 to 6 steps.The key step was the alkylation reaction of silyl cyanide with allylic iodide.

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Five New Flavonoids from Bidens Pilosa L. Var. Vadiata SCH.-BIP

Jia WANG, Hui YANG, Zhong Wen LIN, Han Dong SUN

中国化学快报. 1997, 8(07): 599-602.

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可视化

Five new flavonoids were isolated from the aerial parts of Bidens pilosa L.var.vadiata Sch.-Bip..Their structures were established on the basis of spectroscopic methods.

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Four New Compounds from Isodon Eriocalyx

Jia WANG, Zhong Wen LIN, Tetsuro SHINGU, Han Dong SUN

中国化学快报. 1997, 8(07): 603-606.

摘要 ( )

可视化

Four new diterpenoids named maoecrystal Q-T (1-4) were isolated from the dried leaves of Isodon eriocalyx.Their sturctures were established by spectroscopic methods.

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Studies on an Immune Active Dodecapeptide Isolated from the Buckwheat Pollen

Yan Ling SONG, Xia WANG, Shu Wen HE, Sheng JIN, Jun Da LIU, Shu WANG

中国化学快报. 1997, 8(07): 607-610.

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可视化

A new basic dodecapeptide BPP was isolated from the water-extract of the buckwheat pollen (BP).The sequence of BPP,which was first reported,was determined by DABITC/PITC double coupling method,and confirmed by chemical synthesis.Some analogues of BPP were also synthesized by SPPS Method.The effect of these peptides on spleen lymphocytes from mice of Kunming inbred line and on release of SIL-2R from human lymphocytes were studied.The results showed that these peptides exhibit certain immune activity.

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Regulation of Cleavage Activity of Ser-His Dipeptide on DNA by Phosphorylation

Xiang Hong LI, Yu Fen ZHAO

中国化学快报. 1997, 8(07): 611-612.

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The cleavage reactions of Ser-His and its N-terminal phosphorylated form-N-(O,O-diisopropyl) phosphoryl seryl-histidine (DIPP-Ser-His) were studied on DNA.It was found that the phosphorylation of Ser-His caused the lost of the cleavage activity on DNA.The result might give some clue on the regulation of the activity of protein by phosphorylation.

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Complex Formation between Heptakis(2,3,6-tri-O-butyl)-β-cyclodextrin with p-Nitrophenol in Heptane

Le Xin SONG, Bao Long LI, Rong JIANG, Jian Gang DING, Qing Jin MENG

中国化学快报. 1997, 8(07): 613-614.

摘要 ( )

可视化

Heptakis (2,3,6-tri-o-n-butyl)-β-cyclodextrin (TB-β-CD) has been found to form an inclusion compound with p-nitrophenol in heptane.The stability constant of the inclusion compound of p-nitrophenol with TB-β-CD in heptane is an order of magnitude greater than that in water.

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A modified soft docking method for proteins and peptides

Jun Mei WANG, Li Rong CHEN, Fan JING, Xiao Jie XU

中国化学快报. 1997, 8(07): 615-618.

摘要 ( )

可视化

A modified two-stage soft-docking procedure was developed for the theoretic researches on the recognition of protein-protein or protein-peptide complexes.Some systems have been used to test our program and the results are encouraging.

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Quantitative analysis of two analgesic formulations by micellar electrokinetic chromatography

Bi Yun SUN, Ai Jin HUANG, Yi Liang SUN, Zeng Pei SUN

中国化学快报. 1997, 8(07): 619-622.

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可视化

A micellar electrokinetic chromatographic (MECC) method with sodium cholate as pseudostationary phase was proposed for the separation and quantitation of two analgesic formulations containing acetaminophen,dextro-methorphan hydrobromide,phenylpropanolamine hydrochloride,and chlorpheniramine maleate.The internal standard method was proved to be able to yield satisfactory results even with a modular CE instrument with RSD between 0.6~2.1%,and recoveries ranging from 98.1~99.9%.

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Artificial Neural Networks Applied to Gas Mixture Analysis

Yong Jing LIN, Er Yi ZRU, Peng Yuan YANG

中国化学快报. 1997, 8(07): 623-626.

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An array composed of sixteen gas sensors was constructed to analyze gas mixtures quantitatively.The data of responses from the sensor array to ethane,propane and propylene were treated by three-layer ANN with BP algorithms and PLS.The analytical results indicated that the concentration predicted with ANN is better than that with PLS.The average prediction errors for ethane,propane and propylene were 5.11%,8.28%,2.64%,respectively.

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Study on the Application of Gibberellin for the Spectrophotometric Determination of Arsenic,Phosphorus,Silicon and Germanium^®

Yu Biao WANG, Qian Rong LI

中国化学快报. 1997, 8(07): 627-628.

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In the media of 0.66,0.96,2.16 and 0.54 mol/L of H₂SO₄,the heteropoly acids of As,P,Si and Ge are separately reduced to corresponding heteropoly blues by gibberellin,which exhibit maximum absorptions at 835,820,810 and 805 nm with molar absorptivities of 2.64×10⁴,2.54×10⁴,3.51×10⁴ and 2.25×10⁴ L·mol^-1·cm^-1 and linear ranges of 0-30,0-15,0-10 and 0-30 μg/25mL,respectively.The method was applied to the determinations of As,P and Si in alloyed steel.

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Electron Impact Mass Spectrometry of Acylaminotetraoxyphosphorane

Nan Jing ZHANG, Hai Yan LU, Xin CHEN, Yu Fen ZHAO

中国化学快报. 1997, 8(07): 629-632.

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The electron impact ionization mass spectral fragmentations of a series of acylaminotetraoxyphosphoranes were investigated.The results showed that EIMS of such compounds exhibited very characteristic fragmentation patterns,which would provide useful clues for the structural assignment of this type of compounds.

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Luminescence Properties of the Ternary Terbium Complexes with (Ortho and Para) Aminobenzoic acids and 1,10-Phenanthroline Incorporated in Silica Matrix by a Sol-gel Method

Bing YAN, Hong Jie ZHANG, Shu Bin WANG, Jia Zuan NI

中国化学快报. 1997, 8(07): 633-636.

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可视化

Ternary complexes of terbium with ortho (and para) aminobenzoic acid and 1,10-phenanthroline were introduced into silica gel by the sol-gel method.The luminescence behavior of the solid-state samples was studied during the sol-gel aging process by means of emission,excitation spectra,lifetimes and quantum efficiencies.

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Polymerization of Methyl Methacrylate by Diisopropylamido bis(methylcyclopentadienyl) ytterbium Complex

Li Sheng MAO, Ming Qiang XUE, Qi SHEN

中国化学快报. 1997, 8(07): 637-638.

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It was first found that diisopropylamido bis(methylcyclopentadienyl) ytterbium complex (MeCp)₂YbN(i-Pr)₂(THF) exhibits extremely high catalytic activity in the polymerization of methyl methacrylate.The reactions can be carried out over a quite broad range of polymerization temperatures from-78℃ to 40℃.The results of GPC (gel permeation chromatography) indicate that the molecular weight distribution (Mw/Mn) becomes broad with the increase of temperature.

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Polymerization of Phenyl Isocyanate by Divalent Samarium Complex (ArO)₂Sm(THF)4 (ArO=2,6-di-tert-butyl-4-methylphenoxo)

Fu Gen YUAN, Qi SHEN

中国化学快报. 1997, 8(07): 639-640.

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可视化

Phenyl isocyanate was for the first time successfully polymerized by divalent samarium complex (ArO)₂Sm(THF)₄.The monomer concentration and temperature affected the polymerization greatly.

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Tb(Ⅲ) and Ca(Ⅱ) Ion Equilibria in the Presence of Glutamic Acid and Glutamine

Chun Ji NIU, Shu Fu ZHAO, Yue Ting MA, Hui ZHAO, Yan Min LIU, Shu Gong ZHANG, Jia Zuan NI

中国化学快报. 1997, 8(07): 641-642.

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可视化

Tb(Ⅲ) and Ca(Ⅱ) ion equilibria in the presence of glutamic acid and glutamine were studied by potentiometric titration at 37℃ and an ionic strength of 0.15mol/L(NaCl).The stability constants for Tb(Ⅲ) and Ca(Ⅱ) complexes in the systems were obtained.The species and their distribution in the systems were discussed.

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Synthesis and Luminescence Properties of Barium Fluorotungstate Phosphors

Shui Jin YANG, Ju Tang SUN, Zi Bin QIN

中国化学快报. 1997, 8(07): 643-644.

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可视化

The investigation of the system BaF₂-WO₃ revealed the existence of a fluoro-tungstate formulated as Ba₂WO₃F₄.The Ba₂WO₃F₄ was prepared with the solid state reaction method.Under UV or X-ray excitation,Ba₂WO₃F₄ exhibits a very strong blue-green emission peaking at 480 nm at room temperature.The luminescence properties are similar to those of the tungstate,especially MgWO₄.

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Ab Initio Potential Surface in CH₄ Activation by PTCL₂

Fu Jiang DING, Liang Fu ZHANG

中国化学快报. 1997, 8(07): 645-646.

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Ab initio potential surface of oxidative addition of CH₄ to coordinatively unsaturated PtCl₂ is presented.The electron correlation has a big effect on the transition state and activation energy.

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Ab initio Structure Determination of [Co(NH₃)₅Br]Br₂ Using Conventional X-ray Powder Diffraction

Hong Xiang WU, Li Dun MA

中国化学快报. 1997, 8(07): 647-648.

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可视化

The crystal structure of [Co(NH₃)₅Br]Br₂ has been determined ab initio from the conventional X-ray powder diffraction data.The approximate structure with all 7 independent non-H atoms was solved by direct methods.The final orthorhombic unit-cell parameters after Rietveld refinement are:a=13.6927,b=10.7071,c=6.9400Å,V=1017.47Å³,F₃₀=93(0.0075,43),M₂₀=49,Z=4.Space group is Pnma.The structure agreement factors are:R_p=0.066,Rwp=0.090,R_F=0.041,R_B=0.042.

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Synthesis of Mesoporous Molecular Sieve MCM-41 in Extremely Dense System

Guang Huan LIU, Rui Juan GAO, Hong XU, Jin Xiang DONG

中国化学快报. 1997, 8(07): 649-652.

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可视化

Mesoporous molecular sieve MCM-41 has been synthesized in the extremely dense system (with H₂O/Si < 10) and characterized by XRD,N₂ adsorption isotherm as well as probe reactions of cracking of cumene and isomerization of o-xylene.

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1997年, 第8卷, 第07期　刊出日期：1997-07-20

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1997年, 第8卷, 第07期 刊出日期：1997-07-20

1997年, 第8卷, 第07期　刊出日期：1997-07-20