中国化学快报

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ASYMMETRIC EPOXIDATION OF CHROMENE DERIVATIVES WITH HYDROGEN PEROXIDE CATALYZED BY OPTICALLY ACTIVE Mn (Ⅲ) SALEN COMPLEX

Hong Bin SUN, Wei Yi HUA, Si Xun PENG

中国化学快报. 1995, 6(11): 927-930.

摘要 ( )

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A highly practical asymmetric epoxidation procedure for the synthesis of optically pure epoxychromans has been developed which employs 30% hydrogen peroxied as the oxidant and the Jacobsen-catalyst as the catalyst.The presence of imidazole has a significant effect on epoxidation rates and total turnovers.A variety of chromene derivatives were converted into corresponding epoxides of 89~100% ee in 72~92% isolated yields.

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STRUCTURAL MODIFICATION OF 11-ISOPROPYLIDENE endo-TRICYCLO[6.2.1.0^2,7]UNDECA-4,9-DIENE-3,6-DIONE TO IMPROVE THE STABILITY

Xiao Pei GUAN, Jian Guang SUN, Yong Zhong YU

中国化学快报. 1995, 6(11): 931-934.

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Selective epoxidation of 11-ene double bond in 11-isopropylidene-endo-tricyclo[6.2.1.0^2.7]undeca-4,9-diene-3.6-dione (1a) by mCPBA afforded exclusively syn-epoxide 3,3 is much more stable than 1a. Photocycloaddition of 3 resulted the corresponding trishomocubane 4. Single crystal X-ray analysis of 4 was carried out to establish the stereochemistry of the epoxide moiety.

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SYNTHESIS OF DIALKYL TETRABROMOPHTHALATES BY PTC AND THEIR FLAME RETARDANCY

Xi Kui WANG, Xiao Mei WANG, Guang Tong XU, Ping Rui MENG

中国化学快报. 1995, 6(11): 935-938.

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Eight dialkyl tetrabromophthalates(DATBPs) were synthesized by reacting tetrabromophthalic anhydride with excess alcohols which were used not only as a reactant but also as a solvent and using a quaternary ammonium salt as a phase transfer catalyst(PTC).The yields were found to be between 85-93%.Their structures were characterized by IR,NMR and elementary analysis.The flame retardant properties of the compounds were also studied.

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THE SYNTHESIS OF NEW BENZODIAZEPINIC TRICYCLIC COMPOUNDS

Bin YANG, Liu Hong YUN

中国化学快报. 1995, 6(11): 939-940.

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The new benzodiazepinic tricyclic compounds were synthesized by condensing o-phenylenediamine with 2-carbethoxycyclopentanone or 2-methyl-5-carbethoxycyclopentanone and the synthesic method was discussed.

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DESIGN,SYNTHESIS AND ACTIVITIES OF ANALOGS AND SEGMENTS OF THE PAPAVER SOMNIFERUM POLLEN PEPTIDE PSPP2

Jia Xi XU, Sheng JIN, Meng Shen CAI

中国化学快报. 1995, 6(11): 941-942.

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Four analogs and three segments of the Papaver somniferum pollen peptide 2 (PSPP2) were designed and synthesized by using Merrifield solid phase peptide synthesis method.Their anti-tumour activities were determined by the tetrazolium salt MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method and the relationship of structure-activity was discussed.

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A CONVENIENT METHOD FOR SYNTHESIZING AND CHARACTERIZATION OF (Z)-ALKENOLS AND THEIR ACETATES

Gu YUAN

中国化学快报. 1995, 6(11): 943-944.

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All double bond positional isomers of (Z)-dodecenol,(Z)-tetradecenol,(Z)-hexadecenol and their acetates were synthesized by the Wittig reaction and the coupling reaction,and a novel procedure for the identification of the isomers has been developed by the similarity analysis of mass spectral data in this study.

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SYNTHESTS,STRUCTURES AND ANTITUMOR ACTIVITIES OF β-PHENOLESTER PROPYL GERMANIUM SESQUIOXIDES

Guo Qiang SHANGGUAN, Shu Gong ZHANG, Jia Zuan NI

中国化学快报. 1995, 6(11): 945-946.

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Eight new compounds of(GeCH₂CH(CH₃) COOAr)₂O₃ type were synthesized.Four of them were tested for antitumor activities against Hela cells in vitro,showing considerable tumor inhibitory activities.

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SURFACE MODIFICATION OF PHOSPHOLIPID LIPOSOMES BY INCORPORATION OF GLYCOLIPID

Zi Chen LI, Wei HE, Fu Mian LI

中国化学快报. 1995, 6(11): 947-950.

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Two single-chain glycolipids,octadecyl-β-D-glucopyranoside(1) and 2-octa-decanamido-2-deoxy-D-glucopyranose(2) were synthesized and their dispersing properties in water were studied.Incorporation of 1 into the phospholipid liposomes could inhibit the aggregation of liposomes and improve the molecular packing in the bilayer membranes.

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SYNTHESIS AND PROPERTIES OF THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS CONTAINING BIS(4-HYDROXYPHENYL) METHANONE(Ⅴ)

De Wen DONG, Yu Shan NI

中国化学快报. 1995, 6(11): 951-954.

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A new series of fully aromatic thermotropic liquid crystalline copolyesters were synthesized by thermal polycondensation of p-hydroxybenzoic acid [PHB],terephthalic acid [TPA],resorcinol [RES] and bis (4-hydroxyphenyl) methanone [BHP].The DSC traces of copolyesters exhibited two or three endotherms,the low temperature endotherm(Tm) of which indicated the transition from solid state to anisotropic phase.Observation under polarizing microscope and WAXD measurements suggested that the LC-phase formed immediately above Tm had a nematic character.

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A NOVEL DEPROTECTION OF ACETALS AND KETALS USING SODIUM HYDROGEN SELENIDES

Ping LU, Wei Qiang FAN, Xun Jun ZHOU

中国化学快报. 1995, 6(11): 955-958.

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The 1,3-dioxolanes,1,3-dioxanes and open chain acetals or ketals are easily cleavaged by using sodium hydrogen selenide under basic conditions in high yields.

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THE KINETIC RESOLUTION OF 1,1'-BINAPHTHYL-2,2'-DIYLPHOSPHORYL CHLORIDE WITH OPTICALLY PURE AMINES

Min WANG, Shang Zhong LIU, Jun LIU, Bing Fang HU

中国化学快报. 1995, 6(11): 959-960.

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可视化

The reactions of 1,1'-binaphthyl-2,2'-diylphosphoryl chloride with optically pure amines give diastcreo-selective products with the de% from 20% to 82%.

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AB INITIO STUDY ON THE REACTION OF CH WITH NH3

Zhi Xiang WANG, Ruo Zhuang LIU, Ming Bao HUANG, Zhong Hua YU

中国化学快报. 1995, 6(11): 961-964.

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The mechanism of the reaction of the CH radical with NH₃ has been theoretically studied at the MP2/6-31G^** level.The calculation results indicate that the insertion reaction path is the favourable channel,which is in line with Lin's proposal based on their kinetic experiments.A detailed description of the complicated insertion reaction path is presented.

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A NEW IRIDOID FROM HEDYOTIS CRYSOTRICHAE

Jiang Nan PENG, Xiao Zhang FENG, Xiao Tian LIANG

中国化学快报. 1995, 6(11): 965-966.

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A new iridoid,6'-acetyl asperuloside was isolated from the whole plant of Hedyotis crysotrichae.Its structure has been elucidated by means of ¹H-NMR and ¹³C-NMR spectra.

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TWO NEW TAXOIDS FROM THE NEEDLES OF TAXUS WALLICHIANA ZUCC.

Jun Zeng ZHANG, Qi Cheng FANG, Xiao Tian LIANG, Man KONG, Wen Yi HE

中国化学快报. 1995, 6(11): 967-970.

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Two new taxoids,named taxawallin A(1) and taxawallin G(2) were isolated from the needles of Taxus wallichiana Zucc..Their structures were established by spectral methods.

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FOUR NEW TAXOIDS FROM THE NEEDLES OF TAXUS WALLICHIANA ZUCC.

Jun Zeng ZHANG, Qi Cheng FANG, Xiao Tian LIANG, Man KONG, Wen Yi HE

中国化学快报. 1995, 6(11): 971-974.

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Four new taxoids with rearranged taxane skeleton,named taxawallins C(1),D(2),F(3) and H(4),were isolated from the needles of Taxus wallichiana Zucc.,Their structures were elucidated by spectroscopic techniques.

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GAS FLOW INJECTION DETERMINATION OF NITROGEN DIOXIDE USING GALVANIC COULOMETRIC DETECTOR

Shan Jun LIU, Han Xi SHEN, Xin Chao DING, Jian Xing DENG

中国化学快报. 1995, 6(11): 975-978.

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The direct determination of NO₂ gas using a galvanic coulometric cell as detector by gas flow injection analysis (FIA) is described.The simple modification of the flow injection allows the linear range for the determination of NO₂ gas from 0.01-2 ppm(v/v) to be expanded to 8-500 ppm(v/v) with a relative standard deviation of 3-4%(n=12) at a rate of 25 samples per hour and avoids the problem of time consuming in the equilibrium performance.

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SPECTROPHOTOMETRIC DETERMINATION OF CATIONIC SURFACTANTS BASED ON IRON(Ⅲ)-CHROME AZUROL S COMPLEX

Ming SONG, Shu Quan LIANG

中国化学快报. 1995, 6(11): 979-982.

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可视化

An extraction-free spectrophotometric method for the determination of cationic surfactants is proposed,which is based on the formation of ternary complexes with Fe(Ⅲ) and chrome azurol S.The method gives an apparent molar absorptivity of 6.5×10⁴ L mol^-1 cm^-1 and a linear range of(0.1-6.0)×10^-6 mol/L cationic surfactants,and has been successfully applied to determining cationic surfactants in water.

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A NOVEL IN-SITU SPECTROELECTROCHEMICAL TECHNIQUE WITH PROBE BEAM DEFLECTION:FOR STUDY OF THE ION EXCHANGE BETWEEN FILMS ON ELECTRODE SURFACE AND SOLUTIONS

Jing Hong LI, Guang Jin CHENG, Chang Wei LIU, Ju Guang JIN, Shao Jun DONG

中国化学快报. 1995, 6(11): 983-986.

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A novel in-situ spectroelectrochemical technique,the combination of probe beam deflection (PBD) with cyclic voltammetry (CV),was used to study the ion cxchange process of prussian blue (PB) modified film electrode in contact with various electrolyte solutions.The ion exchange mechanism was verified as following:K₂Fe²⁺Fe^Ⅱ(CN)₈

KFe³⁺Fe^Ⅱ(CN)₈

[Fe³⁺Fe^Ⅲ(CN)₈]_x[KFe³⁺Fe^Ⅱ(CN)₈]_1-xwhere on reduction PB film in contact with an acidic KCl electrolyte,it was confirmed that protons enter into the PB film before K⁺ cations.

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A DV-X_α QUANTUM CHEMICAL STUDY OF THE LEWIS ACIDITY SCALE OF BORON TRIHALIDES BX_a(X=F,C1,Br,I)

Zheng Ting CAI, Ci Ran LI, Re Qin ZHANG

中国化学快报. 1995, 6(11): 987-990.

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The Lewis acidity scale of boron trihalides BX_a(X=F,Cl,Br,I) has been studied by the quantum chemicsl DV-X_α approach.The dipole moments,LUMO energies and the nature of chemical bonds for these molecules have been carried out based on their density of states and orbital populations.A satisfactory interpretation of the experimental acid strength order of boron trihalides can be obtained from our calculated results.

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EXPERIMENTAL STUDIES ON A NEW CHEMICAL OSCILLATING REACTION SYSTEM OF PYRUVIC ACID-BrO₃^--H₂SO₄-[CuL]²⁺

Liang ZHAO, Chang Chun WU, Chuan Hua LU, Zhi Qiang XU, Fu Xin XIE, Shi Sheng NI

中国化学快报. 1995, 6(11): 991-994.

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In this paper a new chemical oscillating reaction in the pyruvic acid-BrO₃^--H₂SO₄-[CuL](ClO₄)₂ system,where L is 5,7,12,14-tetraethyl-7,14-dimethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene,is reported.The features of the oscillations are studied in detail.The effects of Ag⁺, Hg²⁺, CCl₄, Vc, H₂O₂, acrylonitrile,and temperature on the oscillation system are also discussed.

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SOLID STATE REDOX REACTION OF [Fe(bpy)₃](CIO₄)₃ WITH NaNO₂ AT ROOM TEMPERATURE

Wei Hua CHANG, Chu Ru GONG, Xin Quan XIN

中国化学快报. 1995, 6(11): 995-998.

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In this paper,the solid state redox reaction of[Fe(bpy)₃](ClO₄)₃·3H₂O with NaNO₂ was studied at room temperature.Mossbauer spectrometry,XRD,FTIR,magnetic susceptibility measurements and elemental analysis were used to characterize the solid product.

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RUTHENIUM COORDINATION COMPOUNDS WITH POLYPYRIDINES V.DNA-BINDING STUDIES OF Ru(Ⅱ) COORDINATION COMPOUNDS WITH (2-PHENYL-) IMIDAZO [f] 1,10-PHENANTHROLINE

Jian Zhong WU, Lei WANG, Guang YANG, Tian Xian ZENG, Liang Nian JI

中国化学快报. 1995, 6(11): 999-1002.

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The binding of [Ru(bpy)₂(IP)]²⁺(b₂IP), [Ru(bpy)₂(PIP)]²⁺(b₂PIP),[Ru(phen)₂(IP)]²⁺(p₂IP), [Ru(phen)₂(PIP)]²⁺(p₂PIP) to calf thymus DNA was investigated using electronic absorption,circular dichroism and fluorescence emission spectroscopies.CD spectra of dialyzates indicate enantioselectivity associated with binding.Evidence of intercalative binding is also provided by hypochromicity in the MLCT bands,increased emission intensities and curvature of emission quenching by [Fe(CN)₈]^4-.The total binding affinities seem to be in the order b₂IP < b₂PIP ≤ P₂IP < P₂PIP,which is consistent with the order of ligand planarity,extent of aromatic π-system and hydrophobicity,bpy << phen < IP < PIP.

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MICROWAVE EFFECTS ON THE OXIDATIVE COUPLING OF MIETHANE OVER Li₂SO₄／BaCe_0.93La_0.07O₃

Chang Lin CHEN, Pin Jie HONG, Shu Shan DAI, Guang Hui ZHU, Guang Can WANG

中国化学快报. 1995, 6(11): 1003-1004.

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The oxidative coupling of methane over Li₂SO₄/BaCe_0.93La_0.07O₃ irradiated by microwave is reported.Compared with conventional heating mode,under the microwave radiation the temperature of catalytic bed is lower and the products were changed in selectivity favouring the production of C₂ compounds.

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PROMOTION EFFECT OF KF ON THE BASIC PROPERTIES OF ZrO₂

Jian Hua ZHU, Hajime KABASHIMA, Hideaki KITA, Hideshi HATTORI

中国化学快报. 1995, 6(11): 1005-1008.

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Basicity of ZrO₂ is enhanced by KF modification due to the reaction of KF with ZrO₂ surface:KF+ZrO₂→K₂ZrF6+KOH.After pretreated above 673K,KF/ZrO₂ catalyst exhibited higher activity for 1-butene isomenzation at 273K than ZrO₂.The amount of basic sites strongly adsorbing CO₂ in the form of bicarbonate was also increased.

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SYNTHESIS AND CHARACTERIZATION OF METAL COMPLEXES DERIVED FROM POTASSIUM 3-(BENZOTRIAZOLE1-CARBONYLMETHYL)-DITHIOCARBAZATE

Peng Fei XU, Shao Zu WU

中国化学快报. 1995, 6(11): 1009-1012.

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The preparation and characterization of some divalent metal ion M(Ⅱ) complexes derived from potassium 3-(benzotriazole-1-carbonylmethyl)-dithiocar-bazate (BCDHK) is reported.The solid complexes of the composition ML·nH₂O and ML₂·2H₂O (M=Pb(Ⅱ),UO₂(Ⅱ)),have been characterized on the basis of elemental analyses,IR,UV and TGA.

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PREPARATION AND PROPERTIES OF COATED SEMICONDUCTOR CdS/ZnS NANOPARTICLES

Li Min QI, Ji Ming MA, Hu Min CHENG, Zhen Guo ZHAO

中国化学快报. 1995, 6(11): 1013-1016.

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Coated semiconductor CdS/ZnS nanoparticles were fabricated by coating the CdS core with a layer of ZnS in inverse micelle solutions.The optical absorption and photoluminescence(PL) characteristics of the coated CdS/ZnS nanoparticles were investigated and provided evidence for a core-shell structure in these particles.A new PL band with a maximum at 630nm arised from the coated particles and the PL intensity increased with increasing the amount of ZnS coated on the CdS core.

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PREPARATION AND PROPERTIES OF RARE EARTH HYDROXIDES AND OXIDES ULTRAFINE POWDERS IN ALCOHOL

Xiang Ting DONG, Zong Rui LIU, Kui Sheng YANG, Jing He LIU, Guang Yan HONG, De Cai YU

中国化学快报. 1995, 6(11): 1017-1020.

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可视化

A series of rare earth hydroxides and oxides ultrafine powders have been prepared by precipitation method using alcohol as dispersive and protective reagent.It was first to find that the crystallite size of cubic rare earth oxides had lanthanide shrinking effect,but average crystal lattice distortion rate possessed lanthanide swelling effect;the change of diffraction intensity with atoiaic number presented an inverted W type,and double peaks structure was formed.

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1995年, 第6卷, 第11期　刊出日期：1995-11-20

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1995年, 第6卷, 第11期 刊出日期：1995-11-20

1995年, 第6卷, 第11期　刊出日期：1995-11-20