中国化学快报

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N-ARYLATION OF AZOLE COMPOUNDS

Zhi Sheng JIA, Di Lun YANG, You Cheng LIU

中国化学快报. 1995, 6(02): 95-98.

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The azole anions behave as nucleophiles towards nitro-substituted halobenzene,indicating a classical S_NAr mechanism,and the nucleophilicity of azole anions is consistent wtih the pKa values

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SYNTHESIS OF 1-(TRIPHENYLGERM YLPROPIONO)-4-SUBSTITUTED THIOSEMICARBAZIDES

Ru Yu CHEN, Peng Fu Ll

中国化学快报. 1995, 6(02): 99-100.

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Twelve new compounds with the formula of Ph₃GeCHR¹CH₂CONHNHC(X)NHR²(R¹=H,Ph;X=S,O,R²=Ph,p-C1Ph,p-CH₃Ph,o-CH₃Ph,COPh)were synthesized by the reaction of Ph,Ge CHR¹CH₂CONHNH₂with R²NCX in good yield(77-94%)

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C₁₉-DITERPENOID ALKALOIDS OF DELPHINIUM MOLLIPILUM

Suo Ming ZHANG, Qing Yu Ou

中国化学快报. 1995, 6(02): 101-102.

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Five C₁₉-diterpenoid alkaloids were isolated from the aerial parts of Delphinium mollipilum W.T.Wang.Four proved to be the known talitine B,talitme A,brownine and delcosine,while the fifth was a new C₁₉-diterpenoid alkaloid,molline,whose structure was established by spectral methods.

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A NEW CERAMIDE FROM THE MARINE SPONGE BIEMNA SP.

Zhi ZERG, Long Mei ZENG, Jing Yu SU

中国化学快报. 1995, 6(02): 103-104.

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A new ceramide,biemnamide,was isolated from the marine aponge Blemna sp.collected from the South China Sea and its structure was eatablished by spectroscopic analysis.

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TWONEW TRITERPENOID SAPONINS，ASTERBATANOSIDE H AND I，FROM ASTER BATANGENSIS

Yu SHAO, Bing Nan ZHOU, Long Ze LIN, Geoffrey A CORDELL

中国化学快报. 1995, 6(02): 105-108.

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Two new triterpenoid saponins named asterbatanoside H and I have been isolated from the roots of Aster batangensis and their structures elucidated as 3-O-β-D-glucopyranosyl-(1→3)β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside and 3-O-β-D-glucopyranosyl-(1→3)-β-D-glucopyranosyl-23-O-acetyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)β-D-glucopyranoside,respectively,by means of spectral and chemical data.

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STRUCTURE OF 1-EPICRASSICAUDINE

Feng Peng WANG, Xue Ping DAI, Jian Zhong WANG, Rong ZHANG

中国化学快报. 1995, 6(02): 109-110.

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A new C₁₉-diterpenoid alkaloid,1-cpicrassicaudine,was isolated from the roots of Aconitum hemslevanum Pritz var.pengshinese.Speetral methods demonstrated that it has the structure represented by(1)an 1-epimer of crassieau-dine

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A NEW EUDESMANE SESQUITERPENE FROM THE ROOT OFRHAPONTICUM UNIFLORUM

Dong Liang CHENG, Han Xun WEI, Jie Kai CHENG

中国化学快报. 1995, 6(02): 111-112.

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A new eudesmane sesquiterpene was isolated from the root of Rhaponticum uniflorum(Compositae)and Its structure was elucidated on the basis of spectra method(IR,EIMS,¹H-NMR,¹³C-NMR,DEPT and¹H,¹H-Cosy)as 7α,8α,13-trihydroxy-eudesm-△4(14)-△11(12)-diene.

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ENHANCEMENT OF INTRAMOLECULAR EXCIMER FORMATION AND PHOTODIMERIZATION OF POLYETHERS BEARING NAPHTHALENE CHROMOPHORES VIA COMPLEXATION WITH CATIONS

Chen Ho TUNG, Li Zhu WU

中国化学快报. 1995, 6(02): 113-116.

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The fluorescence spectra and photodimerization of naphthalene end-labelled poly(ethylene glycol)oligomers(N-P_n-N)in methanol in the prescence of alkali cations have been investigated.The ion enhances or inhibits intramolecular excimer formation and photodimerization of N-P_n-N,depending on the size of the ion and the length of the polyether chain.This observation suggests that the polyether chain binds the ion,thus adopts a crown ether-like conformation.

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EFFECT OF AMPHIPHILIC α-HELICES OF PEPTIDES ON THEIR BINDING TO CALMODULIN

Li Ping LIU, Zhi Dong XIE, Bing Lin HE

中国化学快报. 1995, 6(02): 117-120.

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Melittin is a small basic peptide which has a high affinity for calmodulin(CaM).In a previous paper,the authors have demonstrated that the deletion peptide Mel(12~25),that is,Mel15 has almost the same binding activity as the intact native peptide⁽¹⁾.In this study,three analogues of Mel15 were synthesized,the role of amphiphilic α-helix of peptides on their binding to CaM were studied.According to the calculation of hydrophobic moment and the analysis of the secondary structure,we proposed that the role of amphiphilic structure is not absolute,since the dissociation constants for the binding of different analogs to CaM bear no predictable relation to the calculated hydrophobic moment and the average hydrophobicity

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THE STUDY OF THE SYNTHESES OF THE DERIVATIVES OF POLYPHENYLENE AND THEIR CONDUCTIVITY

Yin Kui Ll, Qing Zi LIU, San HUANG, Tie Feng WEN, Shang You ZHOU, Wei SUN, Dong Geng WAN, Yung qing LI

中国化学快报. 1995, 6(02): 121-122.

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In this paper,p-dibromobenzene,p-dimethoxybenzene,p-diethoxy-benzene and p-dibutoxybenzene were synthesized using bromobenzene and hydroquinone.Their polymers,poly-p-phenylene,poly-(2,5-dimethoxy)-p-phenylene,poly-p-(2,5-diethoxy)-p-phenylene and poly-(2,5-dibutoxy)-p-phenylene were also synthesized and their IR spectra were done and conductivity was measured.

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STUDIES OF THE INTERACTION BETWEEN METALLOPORPHYRINS OF TMPYP-3 AND SINGLE-STRANDED DNA ON NC MEMBRANE

Yong CHEN, Yuan Zong LI, Wen Bao CHANG, Yun Xiang CI

中国化学快报. 1995, 6(02): 123-126.

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We report here a fast staining method for single-stranded DNA fixed on nitrocellulose membrane using M-meso-tetra(3-N-methylpyridyl)-porphyrin(M-TMPyP,M:Mn³⁺,Fe³⁺,Pt⁺).The optimal staining solution consists of 54~108μg/ml M-TMPyP in 25~200 mmol/L phosphate buffer solution(pH 5.0~8.0).When DNA dot on NC membrane is treated with the staining solution at room temperature for 1~2 minutes with continuous stirring,it turns to brown-yellow.10pg per dot of single-stranded DNA is visible.It is a useful tool to study the DNA blotting,and for recognition of the special bands of DNA in a complete electrophoretogram of DNA blot.The staining mechanism is also discussed.

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INFRARED STUDIES OF Co/Al₂O₃ CATALYSTS: CO AND NO ADSORPTION

Xin Sheng LI, Qin XIN

中国化学快报. 1995, 6(02): 127-128.

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Three kinds of Co sites.i.e.tetrahedral(Co_[T]),octahedral(Co_[O])cobalt sites and bulk Co₃O₄are characterized by infrared spectroscopy of CO and NO adsorbed on reduced and sulfided CO/AI₂O₃at room temperature.

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β CORRECTION SPECTROPHOTOMETRY FOR DETERMINATIONS OF COMPLEX RATIO OF METAL CHELATE AND ITS TRUE MOLAR ABSORPTIVITY

Ilong Wen GAO

中国化学快报. 1995, 6(02): 129-130.

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The mathematical equations of the effective percentage of a complexant and its complex-ratio with a metal have been developed by means of the β-correction pinciple.From a real abeorbance of the chelate produced,its true abeorptivity can be determined accurately.The β-correction spectrophotometry was studied for the determinations of the desired parameters above,using the reaction of lead with Eriochrome Black T(EBT)at pH 8.2.The results show that the analytical ansitivity and precision by β-correction method are both much higher than those by the single wavelength method,the complex-ratio of Pb(Ⅱ)with EBT equals to 1:4 and the true molar absorptivity of Pb(EBT)₄chelate at 550 nm is 3.53×10⁴L.mol^-1.cm^-1.

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THE DETERMINATION OF GLUCOSE IN URINE BY USING CYCLIC VOLTAMMETRY

Zheng Yu ZHOU, Can Zhu GAO, Qing Cun ZHU, Fu Ye GAO, Fan Zhen KONG

中国化学快报. 1995, 6(02): 131-134.

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It has been found that the peak current in KRPB solution is of good linear dependence on the concentration of glucose.According to this relation,the standard curve is plotted and the results of determination of glucose concentration have been presented in the urine of diabetes mellitus.The interference from endogenous oxidizable substances such as uric acid,urea,as well as the effect of chloride on glucose response are also studied.

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STUDY OF THE FLUORESCENCE SYSTEM OF RIBONUCLEIC ACID-Tb（Ⅲ） AND THE DETERMINATION OF RIBONUCLEIC ACID

Jing He YANG, Chang Lun TONG, Nian Qin JIE, Hong Yu GONG, Zu Quan GAO, Hua Bin ZOU

中国化学快报. 1995, 6(02): 135-138.

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It was found that ribonucleic acid(RNA)compiexes with Tb(Ⅲ)at pH=5.0-6.5,which then emits strong characterlstic fluorescence of Tb(Ⅲ).The excitation and emission wavelengths are 288nm,494nm and 545nm,respectively.A linear relationship is obtained between the fluorescence intensity and RNA concentration in the range of 0.1 ug/ml-10 ug/ml.The detection limit is 8.0×10^-10mol/L.This method can be used to determine RNA in the presence of adenylic acid,uridylic acid and cytidylic aci.

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THE ELECTROCHEMICAL BEHAVIOURS OF SOLUBLE POLYIMIDES

Ying ZHU, Wei XING, Gong Quan SUN, Du GUO, Meng Xian DINGTian Hong LU, Shi Quan XI

中国化学快报. 1995, 6(02): 139-140.

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The electrochemical behaviours of three kinds of soluble polyimides were investigated for the first time.It was observed that the cyclic voltammograms(CVs)of these polyimides in nonaqueous solutions are obviously different from that of the polyimide films casted on surfaces of glass carbon electrode(GCEs) in aqueous solutions

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TETRABUTYLAMMONIUM-TETRACYANOQUINODIMETHANE AS ELECTRON-TRANSFER MEDIATOR IN AMPEROMETRIC GLUCOSE SENSOR

Chang Qing SUN, Wen Be SONG, Duo ZHAO, Qian GAO, Hong Ding XU

中国化学快报. 1995, 6(02): 141-142.

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The design and testing of amperometric glucose biosensor was described,in which electrical communication between the flavin redox centers of glucose oxidase and a conventional carbon paste electrode has been achieved by using electron-transfer mediator based on tetrabutylammonium-tetra-cyanoquinodimethane(TBA⁺-TCNQ^-).Characteristics of the biosensor has been shown by cyclic voltammetry.The experimental results show that TBA⁺-TCNQ^-can act as an efficient electron transfer mediator between GOD_ox/GOD_redcenters and a carbon paste electrode

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ELECTROCHEMICAL DIMERIZATION OF FLAVONE

Kuan Ke LU, Zhen TAN, Yu Lin LI, Xin WANG

中国化学快报. 1995, 6(02): 143-146.

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Electrochemical reduction of flavone 1 in ethanol-sulphuric acid solution with lead electrode gave flavanone 3 and 2-2"coupled biflavanones:2a(racemate)and 2b(meso).The configuration of 2a was determined by X-ray crystallography.

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INVESTIGATION ON THE WATER-SOLUBLE YTTERBIUM PORPHYRIN PART I．SYNTHESIS，COMPOSITION AND STRUCTURE

QianKun ZHUANO, Xiao Xia GAO

中国化学快报. 1995, 6(02): 147-148.

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Water-soluble ytterbium complex of tetra-p-sulfonatophenylporphyrin(H₂TPPS)with the formulation Yb·TPPS·OH·2 im·3H₂O(im=imidazole),stable in pH≥5 solution,has been synthesized and characterized by elemental analysis,IR and electronic absorption spectroscopy.Its structure is also proposed.The ytterbium atom exhibits a coordination number of seven with the ytterbium atom out of the porphyrin plane.

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EPOXIDATION OF STYRENE CATALYZED BY POLYMER-SUPPORTED METALLOPORPHYRINS

Xiao Qi YU, Zhong Wei LAN, Ting Xian WEI, Jing Song YOU, Hua Ming ZHAO

中国化学快报. 1995, 6(02): 149-152.

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Manganese(Ⅲ)porphyrins bound to chloromethylated polystyrene bearing some polyglycol chains are efficient catalysts for the epoxidation of styrene by sodium hypochlorite

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SYNTHESIS OF A TITANIUM-CONTAINING POLYOXOANION ［ZnW₁₁O₃₉Ti（H₂O）］^6-AS CATALYST FOR ALKENE EPOXIDATION

Ming Xiu LI, Jing Fu LIU, Ying WANG, Qi Hua YANG, Ya Guang CHEN

中国化学快报. 1995, 6(02): 153-154.

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The synthesis and characterization of the previously unreported[ZnW₁₁O₃₉Ti(H₂O)]^6-polyoxoanion is described.Also reported is a survey of the catalytic epoxidatioa of five olefinic substrates PhIO or 30%aqueous H₂O₂ using this heteropolyanion as a catalyst.

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CATALYTIC ACTIVITY OF TRANSITION METAL SUBSTITUTED POLYOXOMETALATES FOR ALKENE EPOXIDATION

Jing Fu LIU, Qi Hua YANG, Ming Xiu LI

中国化学快报. 1995, 6(02): 155-158.

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The alkenc cpoxidation by iodosylbenzene can be catalyzed by transition metal substituted polyoxomctalates.Among the polyoxometalates examined β-SiW₉M₃,and ZnW₁₁Ti was found to be the most efficient catalyst.The oxidations with sodium periodatc are very selective to alkenc cleavage

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INVESTIGATION OF CATALYTIC ACTIVITY OF TRANSITION METAL SUBSTITUTED POLYOXOMETALATES FOR EPOXIDATION OF ALLYL ALCOHOL AND MALEIC ACID WITHHYDROGEN PEROXIDE

Jibe Fu LIU, Qi Hua YANG, Shanq Donq CHEN, Ming Xiu

中国化学快报. 1995, 6(02): 159-162.

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The epoxidation of allyl alcohol and maleic acid by hydrogcn peroxide can be catalyzed by transition metal substituted polyoxometalates.The transition metal substituted polyoxometalates-hydrogenperoxide system provides an alternative method to prepare cpoxyacids and cpoxy alcohols.

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SYNTHESIS AND CHARACTERIZATION OF ［Ru₆（CO）₁₈］^2-IN NaX ZEOLITE CAGES AND ITS CATALYTIC BEHAVIOR FOR n-C₄H₁₀HYDROGENOLYSIS

An Ming LIU, Lin HUANG, Yi De XU, Takafumi SHIDO, Macaru ICHIKAWA

中国化学快报. 1995, 6(02): 163-164.

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Ru^Ⅲ(NH₃)₆in the cages of NaX zeolite was converted in the presence of CO+H₂into[Ru₆(CO)₁₈]^2-,which was characterized by in-situ FTIR,UV-VIS and EXAFS spectroscopies.The material derived from[Ru₆(CO)₁₈]^2-/NaX exhibited high catalytic activity in n-butane hydrogenolysis.

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A NEW METHOD OF PREPARATION OF METAL OXIDE MODIFIED INORGANIC MEMBRANE

Ru Zhi ZHANG, Guo Xing XIONG, Shi Shan SHENG, Xin Shen LI

中国化学快报. 1995, 6(02): 165-166.

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A new method(premodification)is proposed to manufacture inorganic membrane.A series of metal oxide(NiO,CoO,La₂O₃,Ce₂O₃,Sm₂O₃Y₂O₃)modified inorganic membranes are successfully developed and are characterized by QELS,BET,XRD and DTA.The membranes have a very narrow pore size distribution and the pore size is around 4-10nm.The metal oxide is believed to be a monolayer on the surface of γ-Al₂O₃.The temperature influence has also been investigated.

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PREPARATION OF NANOMETER PEROVSKITE-TYPE COMPLEX OXIDE LaMnO₃ AND CATALYTIC COMBUSTION OF METHANE ON IT

Zi Yi ZHONG, Qi LIANG, Qi Jie, YAN, Xian Cai FU

中国化学快报. 1995, 6(02): 167-168.

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Nanometer perovskite-type complex oxide LaMnO₃with average size of 18.7nm was prepared by sol-gel method,and it exhibited much higher catalytic activity for complete oxidation of methane than that of LaMnO₃with large particle size.The increasing of catalytic activity may be attributed to the increasing of surface area and the change of surface structure for nanometer LaMnO₃.

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AN AB INITIO N₂-H₂O POTENTIAL FOR COMPUTER SIMULATIONS

Jian De GU, Jing Lai ZHANG, An Min TIAN, Guo Sen YAN

中国化学快报. 1995, 6(02): 169-172.

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N₂-H₂O system was studied by ab initio SCF calculations with a 6-31G^** basis set.The results were fitted to an analytical function assuming pairwise additivity for the interaction between individual centres.The analytical funetions were Lennard-Jones 10-6 and exponential form.A satisfactory fitting result was achieved by the simulated anneal algorithm.Special care was paid to repulsive region,which gives the important contributions to the formation of the first solvation shell of apoler solutes.

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1995年, 第6卷, 第02期　刊出日期：1995-02-20

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1995年, 第6卷, 第02期 刊出日期：1995-02-20

1995年, 第6卷, 第02期　刊出日期：1995-02-20