中国化学快报

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LOW-VALENT TITANIUM INDUCED REDUCTIVE CROSS-COUPLING REACTION OF ESTERS WITH DIARYL KETONES

Da Qing SHI, Wei Xing CHEN

中国化学快报. 1993, 4(11): 941-942.

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The intermotecular coupling reaction of esters with diaryl ketones induced by titanium tetrachtoride and zinc powder was studied.

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LOW-VALENT TITANIUM INDUCED REDUCTIVE REACTION OF THIOCYANATES AND ISOCYANATE

Jian Xie CHEN, Da Qing SHI, Wen Ying CHAI, Jian CHEN, Wei Xing CHEN, Tsi Yu KAO

中国化学快报. 1993, 4(11): 943-946.

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Low-valent titanium reagent prepared from titanium tetrachloride and zinc was empolyed to induce the coupling reaction of thiocyanates with tetrahydrofuran yield alkyl 4-hydroxy butyl sulfide and isocyanate yield substituted urea.

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NATURAL PRODUCTS SYNTHESIS BY RETRO-DIELS-ALDER REACTION Ⅷ¹ A CONCISE STEREOSPECIFIC FORMAL SYNTHESIS OF TETRAHYDROCHLOROVULONE

Zhi Yu LIU, Ji Ying YANG, Jian Jun ZHANG, Xue Liang TAO

中国化学快报. 1993, 4(11): 947-948.

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A potent antineoplastic tetrahydrochlorovulone 3 was synthesized with retro-Diels Alder reaction as a key step.

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STUDIES ON CHIRAL THIOPHOSPHORIC ACIDS AND THEIR DERIVATIVES 11.——THE RESOLUTION OF O-METHYL O-PHENYL THIOPHOSPHORIC ACID AND ABSOLUTE CONFIGURATIONS OF ITS OPTICAL ISOMERS

Chu Chi TANG, Mian Ji ZHANG, Fu Peng MA, Zhen LI

中国化学快报. 1993, 4(11): 949-950.

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Racemic O-methyl O-pheayl thiophosphoric acid 1 has been successfully resolved through its quinine and brucine salts in methanol solution by fractional crystallization. The absolute configurations of the optically active 1 have been established as (+)-R-1 and (-)-S-1 by chemical correlation.

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ABNORMAL CYCLIZATION IN PREPARATION OF SOME COUMARINS

Shi Ping XU, Lan Ming LI, Xiao Long HUANG

中国化学快报. 1993, 4(11): 951-952.

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This paper reports abnormal cyclization in the formation of some coumarins.

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NOVEL WATER SOLUBLE HOST MOLECULE DERIVED FROM CALIXARENE

You Heng SHI, Zhi Hui ZHANG

中国化学快报. 1993, 4(11): 953-956.

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Reaction of p-t-butylcalix[6]arene with ethylene oxide gives a water soluble host compound with a hydrophobic cavity and it can include organic molecules and ions in aqueous solution.

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NEW CYCLOARTANE TRITERPENOID CIMISIDE E FROM CIMICIFUGA FOETIDA L.

Cong Jun LI, Ying He LI, Di Hua CHEN, Pei Gen XIAO

中国化学快报. 1993, 4(11): 957-958.

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This paper relates to the structural elucidation of a new cycloartane triterpene glycoside, namely cimiside E (1), which was newly isolatea from the rnizomes of Cimicifuga foetida L.. Based on spectral evidence, its structure has been established as 25-anhydrocimigenol-3-O-β-D-xylopyranoside (23R, 24S).

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EPR STUDIES ON THE DEBROMINATION OF DIPHENYL BROMOMETHANE IN THE PRESENCE OF VIOLOGEN DERIVATIVES AS ELECTRON-TRANSFER CATALYSTS (ETC)

Fu Tian LIU, Liang Bo FENG, Xian Da YU, Shu Ben LI

中国化学快报. 1993, 4(11): 959-962.

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The active intermediate"carbon radical" was detected by the spin-trapping reagent (POBN)^① during the debromination of Ph₂CHBr in the presence of viologen derivatives as electron-transfer catalysts (ETC).

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LOCALIZED MOLECULAR ORBITAL STUDY ON ELECTRONIC STRUCTURES OF BOWL-SHAPED AROMATIC HYDROCARBONS

Zhi Da CHEN, Chun Wan LIU, Jia Xi LU

中国化学快报. 1993, 4(11): 963-964.

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The localized molecular orbitals for typical bowl-shaped circulenes are obtained by the use of INDO-LMO method. It is found that these bowl-shaped circulenes with strained π-electron systems are still aromatic and the rim π-bonds with larger localization form reactive regions for formation of buckminsterfullerene.

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MOLECULAR BEAM STUDIES ON ADSORPTION-DESORPTION KINETICS OF CO AND H₂ ON NiSURFACE

Guang Kang XI, Jian LIU, Sheng Lin LI, Tian Xi HE

中国化学快报. 1993, 4(11): 965-968.

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Adsorption-desorption kinetics of CO and H₂ on Ni surface were studied with molecular beam relaxation spectrometry. It is found that there are two adsorbed states in the substrate temperature range 330K aα=14.6kJ/mol, E_dα=49.3kJ/mol; E_aβ=68.6kJ/mol, E_dβ=200.6kJ/mol. It is shown that there are two adsorbed states in the low (350K 2/Ni system. These results can be explained by a direct dissociative model. Their kinetic parameters:E_dl=26.3kJ/mol, E_dh=103.7kJ/mol.

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OXIDATIVE COUPLING OF METHANE OVER MODIFIED ALKALINE EARTH OXIDES

Guo Xing XIONG, Wei CHU, Qing MIAO, Xie Xian GUO

中国化学快报. 1993, 4(11): 969-970.

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Methane conversions at lower temperature were studied. The aetivity of Y₂O₃ sample at 823K was fairly high with some formation of C₂H₄ and C₂H₆, the catalysts based on alkaline earth oxides and yttria would give better results. The influences of flux ratio, space velocity, and reaction temperature were also discussed.

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CALORIMETRIC STUDY OF COLD.AND THERMAL DENATURATION OF BOVINE β-LACTOGLOBULIN B

Bang Ning WANG, Fu TAN

中国化学快报. 1993, 4(11): 971-974.

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The denaturational behaviour of bovine β-lactoglobulin B has been studied in solutions containing guanidine hydrochloride by differential scanning calorimetry. The experiments have shown that complete peaks of cold denaturation can be recorded also in high concentration of protein solutions. The cold denaturation and the renaturation of the protein are reproducible, but the thermal denaturation is irreversible. The activation energy of thermal denaturation calculated is about 285 kJ/mol.

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IDENTIFICATION OF ALTERNARIOL, ALTERNARIOL MONOMETHYL ETHER AND ZEARALENONE BY PARTICLE BEAM LC/MS

Feng LIU, Yi LUO, Li Han ZHANG, Kai Yuan KUANG, Shi Ying SHI

中国化学快报. 1993, 4(11): 975-978.

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A method for simultaneously analyzing altemariol (AOH), altemariol monomethyl ether (AME) and zearalenone (ZEA) by particle beam LC/MS was established, LC separation was accompiished with a solvent system of methanol and water (80:20 v/v). The followed particle beam LC/MS analysis gave searchable spectra of AOH. AME and ZEA. Application of this technique to analysis of an alternaria culture confirmed the presence of AOH and AME.

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ADSORPTIVE STRIPPING VOLTAMMETRY OF A FENTANYL DERIVATIVE DNPME AT Hg ELECTRODE

Nai Fei HU, Yan Hua LI, Hong GUO, Shu Chang LIN

中国化学快报. 1993, 4(11): 979-982.

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A quasi-reversible reduction peak of a fentanyl derivative DNPME is found by cyclic voltammetry at Hg electrode. E_pc=-1.58 V (vs. Ag/AgCl). The cathodic peak shows adsorptive characteristics. The adsorbed species is DNPME neutral molecule. The method for measuring trace amount of DNPME by adsorptive stripping voltammetry is established.

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EFFECT OF DIFFERENT WAVEFORM'S ALTERNATING CURRENT ON THE INCISION'S SENSITIVITY

Shu Ping BI, Hong GAO

中国化学快报. 1993, 4(11): 983-984.

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Compared with the conventionally used i=i_osin ωt alternating current, using asymmetric triangular and pulse wave as input signals can greatly enhance the incision's sensitivity of "dE/dt-E" oscillogram.

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INDIRECT VOLTAMMETRIC DETERMINATION OF TRACE SULFATE IN NATURAL WATERS WITH THE ADSORPTIVE COMPLEX WAVE OF LEAD(Ⅱ)-TETRAKIS (4-TRIMETHYLAMMONIUM PHENYL) PORPHYRIN

Guo Cang LI

中国化学快报. 1993, 4(11): 985-988.

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The indirect voltammetric determination of trace sulfate (2.0×10^-6~4.0×10^-5 mol/L) with the adsorptive complex wave of lead (Ⅱ)-tetrakis (4-trimethylammonium phenyl) porphyrin (PbTTMAPP) is reported. This method has been used for the analysis of natural waters with satisfactory results.

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STUDIES ON FLUORESCENCE SPECTRA OF SAMARIUM EUROPIUM TERBIUM AND DYSPROSIUM WITH BENZOYL UREA DERIVATIVES AND PHENANTHROLINE

Xin Zhen DU, Jin Zhang GAO, Qun XIE, Jing Wan KANG

中国化学快报. 1993, 4(11): 989-992.

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可视化

Rare earth chelates of benzoyl urea derivatives were prepared in ethanol and fluorescence spectra of these chelates were studied in detail. A composition of[RE (BU) ₃Phen] (NO₃)₃ was obtained. Correlation between chemical properties of ligands, chelates and spectroscopy was discussed. Intramolecular energy transfer in rare earth chelates was explained.

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DETERMINATION OF SENSITIZATION IN AUSTENITIC STAINLESS STEEL

Quan Sheng WU, Wei HE, Chang Yi LIU, Xiao Liang CHENG, Shen Hao CHEN

中国化学快报. 1993, 4(11): 993-994.

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The electrochemical potentiokinetic reactivation technique (EPR) and the potentiostatic pulse technique (PPT) have been used to detect sensitization of austenitic stainless steel. Compared with EPR, PPT has some advantages such as it can be conducted at greater speed and with less destruction, etc. The sensitivity of PPT can be improved by altering t₁/t₂ in a certain range and it will favour the detection of the specimen with lower degree of sensitization.

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INVESTIGATIONS ON NANOMETER-SIZED ULTRAMICRO-ELECTRODES(Ⅱ)-FABRICATION, CHARACTERIZATION OF CARBON FIBER CYLINDER ULTRAMICROELECTRODES

Xue Ji ZHANG, Xing Yao ZHOU

中国化学快报. 1993, 4(11): 995-998.

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Described here are the fabrication and characterization of carbon fiber cylinder ultramicroelectrodes with cylinder length of less than 100 μm, total tip diameter of several hundreds nanometers. The electrodes have been fabricated by direct etching of carbon fiber using an ion beam thinner. Optical microscopy, scanning electron microscopy (SEM), cyclic voltammetry have been employed to characterize those electrodes. The experimental results obtained indicate the electrodes can be used for in vivo detection of neurotransmitters such as dopamine, 5-hydroxytryptamine in a single cell.

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THIN FILM PREPARATION OF AMORPHOUS Ti-Ni ALLOY AND THEIR HYDROGEN ABSORPTION PROPERTIES

Wei Kang HU, Pan Wen SHEN, Yun Shi ZHANG, De Ying SONG, Yun WANG

中国化学快报. 1993, 4(11): 999-1002.

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Amorphous Ti_0.88Ni_1.00 and Ti_1.69Ni_1.00 alloy films are prepared by means of ion beam sputtering using TiNi and Ti₂Ni alloy targets, respectively. Their hydrogen absorption properties are investigated by a galvanostatic method. The results show that the discharge capacity of the Ti_1.69Ni_1.00 sample is higher than that of the Ti_0.88Ni_1.00 sample. And the film electrodes have high durability and long cycle life.

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SYNTHESIS OF A NEW KIND OF AMPHIPHILIC COPOLYMER AND CHARACTERIZATION OF THEIR LB FILMS

Jin WANG, Rui Feng ZHANG, Yue Xia LIANG, De Jun WANG, Jia Cong SUEN

中国化学快报. 1993, 4(11): 1003-1006.

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A new kind of amphiphilic copolymer was synthesized with azo bond functional side chains, and elementary studies about formation of I, B film, UV-visible spectra and photoelectrical properties of multilayers of this kind of amphiphilic copolymer were reported.

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A USEFUL AND PRECISE EXPRESSION FOR ORIENTATION FACTOR 3θ> OF POLED POLYMER FILMS

Cheng YE, Jia Fu WANG

中国化学快报. 1993, 4(11): 1007-1010.

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可视化

Based on ID ROGM, d₃₃ of poled films can be estimated from orientation factor 3θ>. In this letter, a direct expression3θ>=√0.6φ,which is suitable for all used poling methods, is introduced.Order parameter φ can be measured by UV-Vis absorption spectra or polarized IR spectra of poled films.

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CHARACTERISTICS OF CATION-CONDUCTIVE BLENDS PLASTICIZED WITH PROPYLENE CARBONATE

Qing Zhong XU, Guo Xiang Wan

中国化学快报. 1993, 4(11): 1011-1012.

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The cation-conductive blends plasticized with propylene carbonate were prepared. The blends exhibited good mechanical strength and single-cation conduction over a wide range of plasticizer composition. The plasticizer not only increases the conductivity of the blends but also decreases the electrochemical interface resistance between the blend and lithium electrode. The carrier in the blends obviously grows in number.

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GROWTH OF o-DICYANOVINYL ANISOLE(DIVA) CRYSTAL IN ORGANIC SOLVENTS

Bu Guo WANG, Cheng YE, Hui Fang ZHANG, Zhi Ming FENG

中国化学快报. 1993, 4(11): 1013-1016.

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Crystal growth habits of O-Dicyanovinyl anisole (DIVA) in organic solvents are described.

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THE ELECTRONIC STRUCTURE AND THE IONIZATION POTENTIALS OF Ag_n AND Au_n(n=2,3,4)

Han Xing LIU

中国化学快报. 1993, 4(11): 1017-1020.

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可视化

The electronic structure of Agⁿ and Auⁿ (n=2, 3, 4) calculated by DV-X_α method, are different each other, and the ionization potentials of Agⁿ and Auⁿ as a function of cluster size n exhibit an interesting "saw-tooth" behavior. The interactions between atom Ag-Ag and Au-Au in Ag², Au² for different bond length are analyzed. The DOS of the orbitals shows those interactions directly.

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SYNTHESIS AND ELECTRONIC SPECTRA OF RUTNENIUM(Ⅱ)-1,1'-BIISOQUINOLINE COMPLEXES

Rui Yang YANG, Li Xin DAI

中国化学快报. 1993, 4(11): 1021-1024.

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l, l'-biisoquinoline can coordinate with ruthenfum (Ⅱ) to form a new series of mononuclear complexes and the electronic absorption of these complexes were measured and reasonably assigned.

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REACTION OF FERROCENOYL CHLORIDE WITH[Et_aNH] [μ-CO)(μ-RS)Fe₂(CO)₆]COMPLEXES SYNTHESIS AND STRUCTURE OF Fe₂(CO)₆COMPLEXES WITH BRIDGING FERROCENOYL LIGAND

Jin Ting LIU, Xin SHENG, Xia ZHONG

中国化学快报. 1993, 4(11): 1025-1028.

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Reaction of ferrocenoyl chloride with[Et_aNH] [(μ-CO) (μ-RS) Fe₂=(CO)₆] complexes gave bridging ferrocenoyl complexes (μ-FcCO)(μ-RS) Fe₂ (CO)₆ (Fc=ferrocenyl, R=Et, i-Pr, n-Bu, t-Bu, Ph). The structures of all new complexes were characterised by ¹HNMR, IR and MS.

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SYNTHESIS AND CRYSTAL STRUCTURE OF THE FIRST THREE DIMENSIONAL NETWORK CU(Ⅱ) COMPLEX BRIDGED BY BOTH OXAMIDE AND AZIDE

Zhong Ning CHEN, Zhong Gui WU, Wen Xia TANG, Kai Bei YU

中国化学快报. 1993, 4(11): 1029-1030.

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A novel three dimensional network complex polymer[Cu₄ (oxen)₂(N₃)₃]_{n_{(ClO₄)_n·2nH₂O, where oxen is N, N'-bis(2-aminoethyl) oxamide dianion, has been synthesized. It crystallizes in triclinic system, space group P1, with a=11.486 (2), b=11.706 (3), c=12.291 (3)Å, α=77.42 (2), β=67.59 (2), γ=77.96 (2)°, and z=2. The least-square refinements converged at R=0.047, with 3416 observed unique reflections. The complex has a pronounced three-dimensional character and can be viewed as the tetranuclear asymmetric repeating units through inversion and translation operations to extend a three-dimensional network. The structure of Cu₄ asymmetric unit consists of two square planar and two square pyramidal Cu central atoms linked by both azide ligands in end-on and end-to-end bonding modes, and oxamidate bridge in trans conformation.}}

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THE XPS STUDY OF Cu-Co BASED CATALYSTS FOR SYNGAS CONVERSION TO ALCOHOLS

Wei CHU, Guo Xing XIONG, Heng Rong CHEN, Xie Xian GUO

中国化学快报. 1993, 4(11): 1031-1032.

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可视化

The copper-cobalt based catalysts were effective for higher alcohol synthesis, the surface state of the catalysts and the nature of the active sites were investigated by using XPS and XAES spectra, and some strong interactions were also observed, in each of the three cases, (after calcination, after reduction, and during the syngas reaction).

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SYNTHESIS AND CRYSTAL STRUCTURE OF Mo₂S(μ-S)₂[S₂CNC₄H₈]₂

Xiao Ying HUANG, Hong Bing CHEN, Shao Fang LU

中国化学快报. 1993, 4(11): 1033-1034.

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可视化

Mo₂OS (μ-S) ₂[S₂CNC₄H₈]₂, Mr=612.61, triclinic, P1, a=8.666 (2)Å, b=17.366 (6)Å, c=6.708 (1)Å, α=98.29 (2)°, β=97.27 (2)°, γ=79.36 (2)°, V=976.5 (5)Å³, Z=2, Dc=2.03g/cm³, MoKα (λ=0.71069 (?)), μ=19.75cm^-1, F (000)=588, Final R=0.064, Rw=0.073 for 1517 unique intensity data (I>3σ(I)). The binuclear unit of[Mo₂OS₃] has a new asymmetrically terminal coordinated configuration with Mo-Mo distance of 2.807(3)Å.

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1993年, 第4卷, 第11期　刊出日期：1993-11-20

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1993年, 第4卷, 第11期 刊出日期：1993-11-20

1993年, 第4卷, 第11期　刊出日期：1993-11-20