1993 Volume 4 Issue 11

LOW-VALENT TITANIUM INDUCED REDUCTIVE CROSS-COUPLING REACTION OF ESTERS WITH DIARYL KETONES
Da Qing SHI , Wei Xing CHEN
1993, 4(11): 941-942
[Abstract](40) [FullText HTML] [PDF 72KB](0)
Abstract:
The intermotecular coupling reaction of esters with diaryl ketones induced by titanium tetrachtoride and zinc powder was studied.
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
1993, 4(11): 943-946
[Abstract](41) [FullText HTML] [PDF 107KB](0)
Abstract:
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.
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
1993, 4(11): 947-948
[Abstract](38) [FullText HTML] [PDF 98KB](0)
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A potent antineoplastic tetrahydrochlorovulone 3 was synthesized with retro-Diels Alder reaction as a key step.
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
1993, 4(11): 949-950
[Abstract](40) [FullText HTML] [PDF 77KB](0)
Abstract:
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.
ABNORMAL CYCLIZATION IN PREPARATION OF SOME COUMARINS
Shi Ping XU , Lan Ming LI , Xiao Long HUANG
1993, 4(11): 951-952
[Abstract](46) [FullText HTML] [PDF 67KB](0)
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This paper reports abnormal cyclization in the formation of some coumarins.
NOVEL WATER SOLUBLE HOST MOLECULE DERIVED FROM CALIXARENE
You Heng SHI , Zhi Hui ZHANG
1993, 4(11): 953-956
[Abstract](36) [FullText HTML] [PDF 102KB](0)
Abstract:
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.
NEW CYCLOARTANE TRITERPENOID CIMISIDE E FROM CIMICIFUGA FOETIDA L.
Cong Jun LI , Ying He LI , Di Hua CHEN , Pei Gen XIAO
1993, 4(11): 957-958
[Abstract](34) [FullText HTML] [PDF 70KB](0)
Abstract:
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).
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
1993, 4(11): 959-962
[Abstract](43) [FullText HTML] [PDF 115KB](0)
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The active intermediate"carbon radical" was detected by the spin-trapping reagent (POBN) during the debromination of Ph2CHBr in the presence of viologen derivatives as electron-transfer catalysts (ETC).
LOCALIZED MOLECULAR ORBITAL STUDY ON ELECTRONIC STRUCTURES OF BOWL-SHAPED AROMATIC HYDROCARBONS
Zhi Da CHEN , Chun Wan LIU , Jia Xi LU
1993, 4(11): 963-964
[Abstract](40) [FullText HTML] [PDF 70KB](0)
Abstract:
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.
MOLECULAR BEAM STUDIES ON ADSORPTION-DESORPTION KINETICS OF CO AND H2 ON NiSURFACE
Guang Kang XI , Jian LIU , Sheng Lin LI , Tian Xi HE
1993, 4(11): 965-968
[Abstract](44) [FullText HTML] [PDF 156KB](0)
Abstract:
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, Edα=49.3kJ/mol; Eaβ=68.6kJ/mol, Edβ=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:Edl=26.3kJ/mol, Edh=103.7kJ/mol.
OXIDATIVE COUPLING OF METHANE OVER MODIFIED ALKALINE EARTH OXIDES
Guo Xing XIONG , Wei CHU , Qing MIAO , Xie Xian GUO
1993, 4(11): 969-970
[Abstract](37) [FullText HTML] [PDF 100KB](0)
Abstract:
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.
CALORIMETRIC STUDY OF COLD.AND THERMAL DENATURATION OF BOVINE β-LACTOGLOBULIN B
Bang Ning WANG , Fu TAN
1993, 4(11): 971-974
[Abstract](44) [FullText HTML] [PDF 137KB](0)
Abstract:
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.
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
1993, 4(11): 975-978
[Abstract](47) [FullText HTML] [PDF 99KB](4)
Abstract:
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.
ADSORPTIVE STRIPPING VOLTAMMETRY OF A FENTANYL DERIVATIVE DNPME AT Hg ELECTRODE
Nai Fei HU , Yan Hua LI , Hong GUO , Shu Chang LIN
1993, 4(11): 979-982
[Abstract](48) [FullText HTML] [PDF 140KB](0)
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A quasi-reversible reduction peak of a fentanyl derivative DNPME is found by cyclic voltammetry at Hg electrode. Epc=-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.
EFFECT OF DIFFERENT WAVEFORM'S ALTERNATING CURRENT ON THE INCISION'S SENSITIVITY
Shu Ping BI , Hong GAO
1993, 4(11): 983-984
[Abstract](43) [FullText HTML] [PDF 73KB](0)
Abstract:
Compared with the conventionally used i=iosin ωt alternating current, using asymmetric triangular and pulse wave as input signals can greatly enhance the incision's sensitivity of "dE/dt-E" oscillogram.
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
1993, 4(11): 985-988
[Abstract](42) [FullText HTML] [PDF 138KB](0)
Abstract:
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.
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
1993, 4(11): 989-992
[Abstract](45) [FullText HTML] [PDF 226KB](0)
Abstract:
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.
DETERMINATION OF SENSITIZATION IN AUSTENITIC STAINLESS STEEL
Quan Sheng WU , Wei HE , Chang Yi LIU , Xiao Liang CHENG , Shen Hao CHEN
1993, 4(11): 993-994
[Abstract](38) [FullText HTML] [PDF 220KB](0)
Abstract:
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.
INVESTIGATIONS ON NANOMETER-SIZED ULTRAMICRO-ELECTRODES(Ⅱ)-FABRICATION, CHARACTERIZATION OF CARBON FIBER CYLINDER ULTRAMICROELECTRODES
Xue Ji ZHANG , Xing Yao ZHOU
1993, 4(11): 995-998
[Abstract](37) [FullText HTML] [PDF 279KB](0)
Abstract:
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.
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
1993, 4(11): 999-1002
[Abstract](45) [FullText HTML] [PDF 217KB](0)
Abstract:
Amorphous Ti0.88Ni1.00 and Ti1.69Ni1.00 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 Ti1.69Ni1.00 sample is higher than that of the Ti0.88Ni1.00 sample. And the film electrodes have high durability and long cycle life.
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
1993, 4(11): 1003-1006
[Abstract](36) [FullText HTML] [PDF 117KB](0)
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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.
A USEFUL AND PRECISE EXPRESSION FOR ORIENTATION FACTOR 3θ> OF POLED POLYMER FILMS
Cheng YE , Jia Fu WANG
1993, 4(11): 1007-1010
[Abstract](46) [FullText HTML] [PDF 141KB](0)
Abstract:
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.
CHARACTERISTICS OF CATION-CONDUCTIVE BLENDS PLASTICIZED WITH PROPYLENE CARBONATE
Qing Zhong XU , Guo Xiang Wan
1993, 4(11): 1011-1012
[Abstract](44) [FullText HTML] [PDF 103KB](0)
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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.
GROWTH OF o-DICYANOVINYL ANISOLE(DIVA) CRYSTAL IN ORGANIC SOLVENTS
Bu Guo WANG , Cheng YE , Hui Fang ZHANG , Zhi Ming FENG
1993, 4(11): 1013-1016
[Abstract](46) [FullText HTML] [PDF 174KB](0)
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Crystal growth habits of O-Dicyanovinyl anisole (DIVA) in organic solvents are described.
THE ELECTRONIC STRUCTURE AND THE IONIZATION POTENTIALS OF Agn AND Aun(n=2,3,4)
Han Xing LIU
1993, 4(11): 1017-1020
[Abstract](44) [FullText HTML] [PDF 134KB](0)
Abstract:
The electronic structure of Agn and Aun (n=2, 3, 4) calculated by DV-Xα 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.
SYNTHESIS AND ELECTRONIC SPECTRA OF RUTNENIUM(Ⅱ)-1,1'-BIISOQUINOLINE COMPLEXES
Rui Yang YANG , Li Xin DAI
1993, 4(11): 1021-1024
[Abstract](617) [FullText HTML] [PDF 113KB](0)
Abstract:
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.
REACTION OF FERROCENOYL CHLORIDE WITH[EtaNH] [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
1993, 4(11): 1025-1028
[Abstract](24) [FullText HTML] [PDF 144KB](0)
Abstract:
Reaction of ferrocenoyl chloride with[EtaNH] [(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.
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
1993, 4(11): 1029-1030
[Abstract](23) [FullText HTML] [PDF 103KB](0)
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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.
THE XPS STUDY OF Cu-Co BASED CATALYSTS FOR SYNGAS CONVERSION TO ALCOHOLS
Wei CHU , Guo Xing XIONG , Heng Rong CHEN , Xie Xian GUO
1993, 4(11): 1031-1032
[Abstract](24) [FullText HTML] [PDF 89KB](0)
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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).
SYNTHESIS AND CRYSTAL STRUCTURE OF Mo2S(μ-S)2[S2CNC4H8]2
Xiao Ying HUANG , Hong Bing CHEN , Shao Fang LU
1993, 4(11): 1033-1034
[Abstract](25) [FullText HTML] [PDF 86KB](0)
Abstract:
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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