1994 Volume 5 Issue 9

MANNICH REACTION OF HGeCl3 WITH BENZYL AMINE AND AROMATIC ALDEHYDES
Li Juao MAO , Ru Yu CHEN
1994, 5(9): 737-740
[Abstract](174) [FullText HTML] [PDF 113KB](0)
Abstract:
The Mannich reaction of HGeCl3 has been studied for the first time,giving good yields.However,the products are relatively unstable,gradually decomposing into (GeCl2)n,corresponding aldehyde and amine salt,On the contrary,its sesquioxide is very stable and was smoothly obtained.
STUDY ON OXIDATION OF BENZYL ETHERS BY AMMONIUM CHLOROCHROMATE
Li DING , Mi Feng , CHEN Kun CAI
1994, 5(9): 741-742
[Abstract](175) [FullText HTML] [PDF 67KB](0)
Abstract:
Ammonium chlorochromate (NH4CrO3Cl,ACC) was used to oxidize benzyl athers to the corresponding benzoates under dry conditions as well as in the mixed solvent of DMF and HOAc.
STUDIES ON CHEMICAL CONSTITUENTS OF MALLOTUS ANOMALUS, Ⅱ. STRUCTURES OF THE ANTITUMOR COMPONENTS FROM MALLOTUS ANOMALUS
Sheng Cu FENG , Zone Jian TANG , Yi Ping YANG , Ren Shenq XU , Qionq Xinq ZhONG , Yi ZHONG
1994, 5(9): 743-746
[Abstract](190) [FullText HTML] [PDF 121KB](0)
Abstract:
Two new maytansinoid compounds, mallotusine and isomallotusine from Mallotus anomalus showed strong antitumor activity in vitro and in vivo test. Their structures were established by intensive 2D NMR techniques and MS spectral analyses as well as comparison with that of maytansine.
THREE NEW BIOACTIVE ANNONACEOUS ACETOGENININS FROM ANNONA MURICATA
Chao Ming LI , Qing MU , Xiao Jiang HAO , Han Dong SUN , Hui Lan ZHENG , Yang Chang WU
1994, 5(9): 747-750
[Abstract](177) [FullText HTML] [PDF 184KB](1)
Abstract:
Three new bioactive mono-tctrahydrofuranic γ-lactone acetogenins,named muricatin A(1),b(2),C(4) respectively and a known compound gigantetrocin (3),were isolated from Annona muricata Linn.Their structure elucidation was achieved by spectroscopic means.
A NEW CYCLOPEPTIDE FROM ARENARIA JUNCEA
Yu Rui ZHAO , Jun ZHOU , Xian Kai WANG , Xiao Lin HUANG , Hou Ming WU , Tong Fang ZHAO
1994, 5(9): 751-754
[Abstract](177) [FullText HTML] [PDF 135KB](0)
Abstract:
A new cyclopeptide named arenarin A(1) was obtained from the roots of Arenaria juncea Bieb and its structure was established to be cyclo(Ser-Ser-Phe-lle-Pro-Pro-Phe) by a combination of 2D-NMR and FABMS.
TWO NEW C19-DITERPENE ALKALOIDS FROM DELPHINIUM SWINANENSE VAR LEPTOPOGON
Suo Ming ZHANG , Qing Yu OU , Wei Le YU
1994, 5(9): 755-756
[Abstract](179) [FullText HTML] [PDF 80KB](0)
Abstract:
An investigation of the alkaloids of Delphinium swinanense var.leptopogon resulted in the isolation and identification of two new C19-diterpene alkaloids named swinanine A and B,together with one known tatsiensine.The structures of the new alkaloids were established from spectral evidence.
INULOSIDE A AND B. TWO NEW DITERPENE GLYCOSIDES FROM INULA BRITANNICAL. VAR CHINENSIS
Yu SHAO , Nai Shen BAI , Bing Nan ZHOU
1994, 5(9): 757-760
[Abstract](181) [FullText HTML] [PDF 144KB](1)
Abstract:
Two new diterpene glycosides,inulosides A and B,have been isolated from Inula britannica L. var chinensis and their structures established as (-)-17-O-β-D-glucopyranosyl-16α-kauran-19-oic acid and (-)-17-O-β-D-glucopyran-osyl-16α-kauran-19-oic acid-19-O-β-D-glucopyranoside,respectively,through spectral data,and chemical and enzymatical methods.
ASTERYUNNANOSIDE E,A NEW TRITERPENOID SAPONIN FROM ASTER YUNNANENSIS FRANCH
Yu SHAO , Bing Nan ZHOU , Long Ze LIN , GeoffFey A. Cordell
1994, 5(9): 761-764
[Abstract](178) [FullText HTML] [PDF 149KB](0)
Abstract:
A new oleanane-type triterpene saponin,asteryunnanoside E,has been isolated from the roots of Aster yunnanensis Franch,and its structure elucidated as 3-O-β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside by means of spectral data particularly 2D NMR including COSY,HETCOR,HOHAHA and ROESY techniques and chemical transformation.
CAPILLARY ZONE ELECTROPHORESIS AND MICELLAR ELECTROKINETIC CAPILLARY CHROMATOGRAPHY OF SOME PROTECTED AMINO ACIDS AND PEPTIDES
LI ZHANG , Rong Hul YANG , Sheng JIN
1994, 5(9): 765-766
[Abstract](188) [FullText HTML] [PDF 75KB](0)
Abstract:
The possibilities of capillary zone electrophoresis (CZE) and micellar electrokinetie capillary chromatography (MECC) were investigated for the qualitative analysis of ten protected amino acids and peptides,The results show that MECC method has a better separation than CZE for these compounds.
INDIRECT THERMO-OPTICAL DETECTION FOR CAPILLARY ELECTROPHORESIS SEPARATION OF AMINO ACIDS
Ji Cun REN , Bing Cheng LI , Yan Zhuo DENG , Jie Ke CHENG
1994, 5(9): 767-768
[Abstract](172) [FullText HTML] [PDF 101KB](0)
Abstract:
In this letter,we first reported a novel method——indirect thermo-optical detection used in CE separation of native amino acids.By using methylene blue as background absorber,the detection limit for lysine was 5×10-6 mol/L.
MICROELECTRODE VOLTAMMETRIC STUDY OF C70
Nan Qiang LI , Wei jun HE , Zhen Nan GU , Xi Huang ZHOU , Yi Liang SUN , Yong Qing WU
1994, 5(9): 769-772
[Abstract](184) [FullText HTML] [PDF 108KB](0)
Abstract:
The successive six step reductions of C70 in watar-free acetonitrile-xylene (1:4) mixed solvent containing 0.1 mol/L tetrabutylammonium hexafluorophosphate (Bu4NPF4) were obtained at below 20℃ by using Au and Pt microdisk electrodes.Several electrochemical data were determined.
IMMOBILIZATION OF GLUCOSE OXIDASE AND CELLULASE BY ENTRAPMENT OF HYDROGEN-BOND COMPLEX
Chang De ZHANG , Ling Zhi WANG , Ying Yan JIANG
1994, 5(9): 773-776
[Abstract](171) [FullText HTML] [PDF 164KB](0)
Abstract:
Glucose oxidase (GOD) and cellulase were immobilized on the hydrogen-bond complex of chitosan and sodium carboxymethyl cellulose,The immobilized GOD (IG) can be used in a wider pH range,and its optimum temperature was increased 50℃ higher than its native state;While the optimum temperature of the immobilized cellulase (IC) was increased 20℃ The storage life of IG and IC were prolonged greatly,Both of them can be reused many times,and have a high catalytic activity,Their Michaelis constants Km were determined.
POTASSIUM FLUORIDE ON ALUMINA CATALYZED ALDOL CONDENSATION OF INDENE AND ACETOPHENONE
Weng Xing LU , Chao Guo YAN , Hui Fen GU
1994, 5(9): 777-778
[Abstract](174) [FullText HTML] [PDF 72KB](0)
Abstract:
Alumina coated with potassium fluoride is proved to be a potential solid base catalyst for aldol condensation of indene and acetophenone with aromatic aldehydes,benzofulvenes and chalcones are synthesized in high fields.
PREPARATION AND CATALYTIC HTDROGENATION BEHAVIOUR OF POLYMERIC PORPHYRIN-PALLADIUM COMPLEX
Rong Min WANG , Yun Pu WANG , Jian XIONG , Zi Qiang LEI
1994, 5(9): 779-780
[Abstract](180) [FullText HTML] [PDF 57KB](0)
Abstract:
The complex of palladium with the polymeric meso-tetraphenylporphyrin which is linked by terephthalate has been synthesized.The complex possesses a high catalytic activity for the hydrogenation of 1-hexene and nitrobenzene,and it has been found that the catalytic activity is affected by reaction temperature,concentration of the substrate and the amount of catalyst.
STUDIES ON CALIXARENES I THE CNDO/2 CALCULATION OF EQUILIBRIUM MOLECULAR GEOMETRY OF CALIX[4]ARENE IN CONE CONFORMATION
Yong LI , Yan Zhao ZHENG , Jin Liang GUO , Xin Qi SONG
1994, 5(9): 781-784
[Abstract](182) [FullText HTML] [PDF 183KB](0)
Abstract:
The equilibrium molecular geometry of 25,26,27,28-tetrahydroxycalix[4]arene in cone conformation was calculated by a CNDO/2 method based on the standard geometrical models.The results are in good agreement with those obtained from X-ray analysis.
CROSSED SUPERSONIC MOLECULAR BEAM STUDY OF Cl+CH2I2→ICl+CH2I
Jian Xin QI , Guang Jun WANG , Yong Xiang SHA , Hou Ming YIN , Guo Zhong HE , Nan Quan LOU
1994, 5(9): 785-788
[Abstract](187) [FullText HTML] [PDF 167KB](1)
Abstract:
The reaction Cl+CH2I2→ICl+CH2l has been studied at a relative collision energy of 53.2 kJ/mol using the crossed beam technique.Angular and translational energy distributions of reactively scattered ICl products have been measured.The angular distribution is consistent with reaction occurring through a short lived complex with life time about 0.8 of the rotational period.The kinetic energy distributions measured for this system show strong coupling to scattering angles.The forward and backward scattered products have higher translational energy than sideways scattered.A phase space model is developed which can give a good explanation for the experimental energy distributions.
SCANNED LASER SPOT PHOTOCURENT RESPONSE STUDIES OF FERROCENE DERIVATIVE LB FILMS MODIFED CdSe THIN FILM ELECTRODES
Yuan LIN , Xu Rui XIAO , Yong YANG , Xu Guang CHEN , Jing Kua YOU
1994, 5(9): 789-790
[Abstract](176) [FullText HTML] [PDF 104KB](0)
Abstract:
Photocurrent behaviours of 1,1'-di linolene ferrocenyl LB films modified CdSe thin film electrode were studied by scanned laser spot method.The increase in photocurrent response of modified electrode compared to the bare electrode was analyzed by statistical calculation, The acceleration of interfacial electron transfer by modified molecules which act as redox mediator was discussed.
LASER-ENHANCED ELECTROCHEMICAL DOPING OF POLY (N-VINYLCARBAZOLE)
Yan Ling LI , Jun Hui YANG , Ji Ren XU
1994, 5(9): 791-794
[Abstract](187) [FullText HTML] [PDF 125KB](0)
Abstract:
Laser-electrochemical doping of poly(N-vinylcarbazole) (PVK) leads to the formation of high conducting PVK polymers.The doped polymers were characterized by IR spectra and electrical conductivity measurement.The results show that the photochemical effects from laser irradiation on the working electrode speed up the reaction rate and increase the doping degree of ClO4- counterion.
SYNTHESIS OF THERMOTROPIC LIQUID CRYSTAL AROMATIC COPOLYESTERS AND COPOLY (ESTER-AMIDE)S CONTAINING DI (ETHYLOXY-ETHER) AS THE SPACER
Shang Er WANG , Zhi Shen MO , Hong Fang ZHANG , Zhi Liu FENG
1994, 5(9): 795-796
[Abstract](175) [FullText HTML] [PDF 100KB](0)
Abstract:
Flexible di(ethyloxy-ether) was introduced into the aromatic copolyesters and copoly(ester-amide)s to reduce the melting point of resulting polymers.The liquid crystallinity was proved by PLM observation and WAXD study.The melting point was greatly reduced,to 200℃ or even lower in some cases,and the molecular weight was satisfactorily high as reflected by inherent viscosity.The copolyester showed better crystallinity and liquid crystallinity than corresponding copoly(ester-amide) with similar monomer composition.
REACTIVE POLY(ARYLENEETHERSULPHONE):MALEIMIDE-TERMINATED POLY(ARYLENEETHERSULPHONE) OLIGOMERS USING N-(4-HYDROXYPHENYL) MALEIMIDE AS AN ENDBLOCKING MONOMER
Lian Lai ZHANG , Yi GU , Lu Xia JIANG , Xing Xian CAI
1994, 5(9): 797-798
[Abstract](183) [FullText HTML] [PDF 103KB](0)
Abstract:
A new procedure has been developed successfully to prepare the maleimide-terminated poly (arylene ether sulphone) oligomers,It was conducted by the aromatic nucleophilic substitution of the chloro-terminated poly (arylene ether sulphone) oligomer by an endblocking monomer,N-(4-hydroxyphenyl) maleimide.The reaction and structure of the product were confirmed by FT-IR.1H-NMR and elemental analysis.
FERROMAGNETICALLY COUPLED BINUCLEAR Fe(Ⅲ) COMPLEXES THROUGH ISOPHTHALATO-BRIDGE
Yan Tuan LI , Dai Zheng LUO , Zong Hui JIANG , Geng Lin WANG
1994, 5(9): 799-802
[Abstract](181) [FullText HTML] [PDF 190KB](0)
Abstract:
Four new binuclear Fe(Ⅱ) complexes containing the dianion of isophthalic acid as bridge have been synthesized,namely[Fe2(IPHTA) (L)4] (ClO4)4 [L denotes 2,2'-bipyridyl(bpy);1,10-phenanthroline (phen);4,4'-dimethyl-2,2'-bipyridyl (Me2bpy) and 5-nitro-1,10-phenanthroline (NO2-phen),respectively],where IPHTA represents the isophthalate dianion.The complex[Fe2(IPHTA)(phen)4](ClO4)4 was characterized with variable temperature magnetic susceptibility (4-300K).The exchange integral J was found to be 9.96 cm-1,indicating that weakly ferromagnetic spin-exchange interaction operates between Fe(Ⅱ) and Fe(Ⅱ) ions.
PREPARATION, ELECTRICAL PROPERTIES AND CRYSTAL STRUCTURE OF TWO NEW CHARGE-TRANSFER SALTS (BEDT-TTF) 3Cu2Brx AND (TTM-TTF) (Cu2Bry) (y~4.72)
Sheng Gao LIU , Pei Ji Wu , Dao Ben ZHU
1994, 5(9): 803-806
[Abstract](168) [FullText HTML] [PDF 134KB](0)
Abstract:
Two new organic conductor-semiconductor with Cu-containing binuclear polyhalide complex anion (BEDT-TTF)3Cu2Brx(A) and (TTM-TTF) (Cu3Bry) (B) are prepared and the crystal structure of B is determined,The conductivity of the crystal A and B at room temperature along the crystal growth direction is about 10 and 7■10-4 S.cm-1,respectively.
SYNTHESIS,STRUCTURE AND LUMINESCENCE PROPERTIES OF K2VOF5 AND K3VO2F4
Hong Jie ZHANG , A. GARCIA , F. GUILLEN , J. P. CHAMINADE , C. FOUASSIER
1994, 5(9): 807-808
[Abstract](178) [FullText HTML] [PDF 92KB](0)
Abstract:
The luminescence properties of K2VOF5 and K3VO2F4 are reported for the first time.The really interesting result obtained is the observation of vibration structure in the emission band of the new compound,K2VOF5,at 4.2K The vibrational mode involved for K2VOF5 is V-O stretching vibration.
THE PREPARATION AND CHARACTERIZATION OF ZnO-Ag CORE-SHELL ULTRAFINE PARTICLE
Si Hai ChEN , Xin Min REN
1994, 5(9): 809-810
[Abstract](184) [FullText HTML] [PDF 82KB](0)
Abstract:
The ZnO-Ag core-shell ultrafine particle in ethanol was prepared by photoreduction and colloidal methods.The experimental results obtained from absorption spectroscopy,fluorescence spectroscopy and electron microscopy revealed that the structure of the hybrid particle is ZnO core covered with Ag shell.The thickness of the silver layer can be controlled by the concentration of Ag+ ions and the time of UV irradiation.The structure of the electric double layer of the ZnO seed greatly affects the formation of ZnO-Ag hybrid particle.
HIGH DISPERSION OF CUPRIC CHLORIDE INTO ZEOLITE BETA BY MICROWAVE TECHNIQUE
Qun ZHOU , Wen Guo XU , Shi Lun QIU , Wen Qin PANG
1994, 5(9): 811-814
[Abstract](187) [FullText HTML] [PDF 140KB](0)
Abstract:
By using microwave technique,cupric chloride was highly dispersed into zeolite Beta with critical dispersion capacity of 0.6 g CuCl2·2H2O/g Beta,From the IR results,it was found that solid state ion-exchange process of copper ions and dispersion process of cupric chloride molecules could simultaneously occur during microwave treatment.High dispersion of cupric chloride molecules results in more active sites for CO adsorption in zeolite Beta.
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