1996 Volume 7 Issue 5

A NEW SYNTHESIS OF 1,4-DISUBSTITUTED AZO UREAS
Jian Ping LI , Jin Ye WANG , Dong Un MA , Yu Lu WANG
1996, 7(5): 393-394
[Abstract](152) [FullText HTML] [PDF 155KB](0)
Abstract:
Ten new 1,4-disubstituted azo ureas were synthesized by the reaction of substituted semicarbazide compounds with a phenoxyl radical between two phases in good yield.
SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF TRIPYRRANE-CONAINING BISMACROCYCLE
Shi Ming DONG , Duo Yuan WANG
1996, 7(5): 397-398
[Abstract](153) [FullText HTML] [PDF 44KB](0)
Abstract:
A novel tripyrrane-containing bismacrocycle ligand was acquired by the improved procedure of the metal template 1:1 Schiff base condensation.The condensation of diformyltripyrrane <1> with 3,4,3',4'-tetraamino-biphenyl hydrochloride was modified by excluding water efficiently,then the yield was increased to over 90%.
SYNTHESIS AND SPECTROSCOPIC PROPERTIES OF AN AMINO ACID MODIFIED PHTHALOCYANINE
Run An DONG , Yong QIU , Xin Qi SONG , De Wen CHEN
1996, 7(5): 399-400
[Abstract](160) [FullText HTML] [PDF 80KB](0)
Abstract:
One amino acid modified phthalocyanine was synthesized and its absorption was measured.And a red shift up to 25 nm relative to ZnPc (NH2)4 was found.
SYNTHESIS AND VESICLES OF A DOUBLE-CHAIN GLYCOLIPID
Zi Chen LI , Wei HE , Fu Mian LI
1996, 7(5): 401-402
[Abstract](165) [FullText HTML] [PDF 85KB](0)
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A double-chain glycolipid,dioctadecyl-2-glucopyronosylthio-succinate (1) was synthesized.The glycolipid itself formed stable vesicles.It could also be incorporated into the lipid bilayer membrane to form stable mixed liposomes.
AN ALTERNATE SYNTHESIS OF 4,6-DIHYDROXYQUINAZOLINE
Yi Qiang ZHU , Hui Tong TANG , Pang ZHANG
1996, 7(5): 403-406
[Abstract](168) [FullText HTML] [PDF 135KB](3)
Abstract:
The title compound was synthesized by condensation of methyl 2-dimethoxyacetyl-4-oxopentanoate and thiourea followed by desulfurization and acid-catalyzed cyclization.
SYNTHESIS OF 1-SUBSTITUTED 1H-1,2,4-TRIAZOLE DERIVATIVES
Yan Nian SIH , Yang YANG , Jian Xin FANG , Wen Shuo LU
1996, 7(5): 407-410
[Abstract](151) [FullText HTML] [PDF 124KB](0)
Abstract:
Three new series of triazole compounds were synthesized.The method of synthesis and biological activities of these new compounds were studied.
SELECTIVE REDUCTION OF CLERODANE DITERPENOIDS
Huan Ming CHEN , Zhi Da MIN
1996, 7(5): 411-414
[Abstract](150) [FullText HTML] [PDF 189KB](1)
Abstract:
The α,β-unsaturated γ-lactones of neo-clerodane diterpenoids teucvidin,teupernin E and ajugacumbin A were selectively transformed into saturated γ-lactones and unsaturated diol derivatives with NaBH4.These transformations are of interest due to their selective reduction as compared with catalytic hydrogenation and LiAlH4 reduction of these diterpenoid compounds.
ASYMMETRIC SYNTHESIS XXⅧ:ENANTIOSELECTIVE REDUCTION OF AROMATIC KETONES CATALYZED BY NEW CHIRAL CATALYST-(4R,8R,9S)-CAMPHANE[8,9-b]-1,3,2-OXATHIOBOROLIDINE
Yao Zhong Jiang , Xiao Ming Feng , Liu Zhu Gong , Zhi Li , Gui Su Yang , Ai Qiao Mi
1996, 7(5): 415-418
[Abstract](155) [FullText HTML] [PDF 108KB](0)
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(4R,8R,9S)-Camphane[8,9-b]-1,3,2-oxathioborolidine prepared from (1R,2S,3R)-3-mercapto-camphol with borane was used as catalyst in the enantioselective reduction of aromatic ketones:moderate enantioselectivities with e.e.7.44%-51.04% have been obtained for aromatic ketones with 20% mol catalyst,73.78% e.e for ω-bromo acetophenone with 100% mol catalyst.
DIRECT CONVERSION OF 3-ACETOXYBENZOFURANS TO 3-METHOXYBENZOFURANS
Zhi Min WANG , Xiao Tian Liang , Shu Feng CHEN
1996, 7(5): 419-422
[Abstract](166) [FullText HTML] [PDF 145KB](0)
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A direct conversion of 3-acetoxybenzofurans to 3-methoxybenzofurans was realized by refluxing in anhydrous methanolic solution containing hydrogen chloride.
A NEW REACTION FOR ONE-POT, SELECTIVE MONO-O-GLYCOSYLATIONS OF 9,10-DIHYDROXYPHENANTHRENE UNDER MILD CONDITIONS
Zhong Wu GUO , Yong Zheng HUI
1996, 7(5): 423-424
[Abstract](159) [FullText HTML] [PDF 86KB](0)
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9,10-Dihydroxyphenanthrene was selectively mono-O-glycosylated by a new,one-pot reaction through its activated phospholane intermediate.The reactions were carried out under mild conditions without activation of the anomeric center.
BIS-PER(POLY)FLUOROALKYLATION OF PARA-SUBSTITUTED PHENOLS BY RFI/Na2S2O4 REAGENT SYSTEM
Wei Yuan Huang , Hong Bin Yu
1996, 7(5): 425-426
[Abstract](167) [FullText HTML] [PDF 95KB](0)
Abstract:
In the presence of dithionate,excess per (poly) fluoroalkyl iodide reacted with parasubstituted phenolates to provide bis-per (poly) fluoroalkyl substituted phenols in fair to good yields.
SYNTHESIS OF TETRAMETHYL SALVIANOLIC ACID F AND TRIMETHYL PRZEWALSKINIC ACID A
Chun Bo AI , Lian Niang Li
1996, 7(5): 427-430
[Abstract](172) [FullText HTML] [PDF 184KB](1)
Abstract:
Salvianolicacid F (la) and przewalskinic acid A (2a) are phenolic acids isolated from the traditional and herbal Chinese medicines Salvia miltiorrhiza (1) and S. przewalskii (2). The chemical structures of these nvo compounds represent the main carbon skeletons of the biologically active depsides salvianolicacid A and B isolated from S.miltiorrhiza (3.4). 丁he present paper reports the synthesis of the methyl ether protected phenolic acids, tetnimetfayl salvianolic acid F (lb) and trimethyl przewaiskinic acid A (2b).
A NEW METHOD FOR THE PREPARATION OF FULLEROL
Da Yong SUN , Zi Yang LIU , Xing Hua GUO , Yi Min SHE , Yu ZHOU , Shu Ying LIU
1996, 7(5): 431-432
[Abstract](154) [FullText HTML] [PDF 111KB](0)
Abstract:
Reaction of C60with excessive potassium in toluene at refluxing temperature results in black precipitate K2C60with high conversion,which can completely be hydrolyzed to prepare the fullerol.Investigations including FT-IR.1H NMR.13C NMR.UV-Vis and FABMS of the product were reponed.
REACTIONS OF C60 WITH R3SnH:A NEW SYNTHETIC TO C60(RH)n AND THE PROPERTY OF C60 TO CATALYZE RADICAL REACTIONS
Yi Min SHE , Ya Ping TU , Xing Hua GUO , Zi Yang LIU , Shu Ying LIU
1996, 7(5): 433-436
[Abstract](153) [FullText HTML] [PDF 187KB](0)
Abstract:
A new method for the preparation of polyalkyl and polyarenefullerene derivatives C60(RH)n (R=Bu,n=1-3;R=Ph,n=1-10) by the reaction of C60 with organotin hydride in toluene is described.Another series of products of stannanes RaSnbHc (R=Bu,a=3-8,b=1-4,c=0-3;R=Ph,a=3-11,b=1-5,c=0-4) were also obtained,which shows that C60 can catalyze polymerization of organic-tin.These products were determined by mass and infrared spectrometry.And the possible reaction mechanisms are discussed.
CHEMICAL MODIFICATION INCREASE THE ACTIVITY AND ENANTIOSELECTIVITY OF CANDIDA LIPOLYTICA LIPASE
Gang DUAN , Jia Yong CHEN
1996, 7(5): 437-438
[Abstract](161) [FullText HTML] [PDF 71KB](0)
Abstract:
In this work,the effects of chemical modification on the activity and enantioselectivity of Candida lypolytica lipase in resolution of Ibuprofen were reported.
A NEW INGENOL ESTER FROM EUPHORBIA PETIOLATA
Yan-Ping SHI , Bin Zhong-Jian JIA , Jamil LAHHAM , Sadiq A. SALEH
1996, 7(5): 439-440
[Abstract](159) [FullText HTML] [PDF 82KB](0)
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A new monoester of the tetracyclic diterpene ingenol was isolated from Euphorbia petiolata and its structure was elucidated by spectroscopic methods and chemical transformation as ingenol-3-O-(2'E,4'Z)-tetradecadienoate.
A NEW DITERPENOID FROM COLEUS SCUTELLARIOIDES
Qing MU , Hong Jie ZHANG , Chao Ming LI , Han Dong SUN
1996, 7(5): 441-442
[Abstract](165) [FullText HTML] [PDF 66KB](0)
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From the herbs of Coleus scutellarioides,a new diterpenoid was isolated and identified as 2-(2'ξ-methoxypropyl)-3-hydroxy-5,7,8-trimethylphenanthrene-1,4-dione,named as scutequinone (1).
STRUCTURE OF 6-EPICHASMANINE
Zheng Bang LI , Feng Peng WANG
1996, 7(5): 443-444
[Abstract](161) [FullText HTML] [PDF 71KB](0)
Abstract:
A new norditerpenoid alkaloid,6-epichasmanine,was isolated from the roots of Aconitum kusnezoffii.Its structure was determind on the basis of spectrscopic analysis.
TWO NEW PHENYLPROPANOID GLYCOSIDES FROM CARYOPTERIS INCANA(THUNB.) MIQ
Jian Jun GAO , Gui Qiu HAN , Li YANG
1996, 7(5): 445-448
[Abstract](165) [FullText HTML] [PDF 120KB](0)
Abstract:
Two new phenylpropanoid glycosides,incanoside A and B were isolated from the whole plant of Caryopteris incana (Thunb) Miq.On the basis of chemical and spectral evidence,incanosides A and B were determined as 3-hydroxy-4-methoxy-β-phenylethyl α-L-rhamnopyranosyl (1→3)-β-D-glucopyranosyl (1→2)-6-O-reruloyl-β-D-glucopyranoside and 3-hydroxy-4-methoxy-β-phenylethyl α-L-rhamnopyranosyl (1→3)-β-D-glucopyranosyl (1→2)-β-D-glucopyranoside,respectively.
SALVIAFLASIDE AND SALVIAFLASIDE METHYL ESTER TWO NEW DEPSIDIC GLYCOSIDES FROM SALVIA FLAVA
Li Min ZHAO , Wen Yi HE , Xiao Tian LIANG , Lian Niang LI
1996, 7(5): 449-452
[Abstract](157) [FullText HTML] [PDF 143KB](0)
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Two new depsidic glycosides salviaflaside and its methyl ester were isolated from the aqueous extract of Salvia flava.Their structures were elucidated by spectral analysis,especially by 2D NMR analysis.
SPECTROFLUORIMETRIC DETERMINATION OF TERBIUM USING THE SYSTEM OF Tb(Ⅲ)-TPA
Jun ZHAO , Guo Hu ZHAO , Qi LUO
1996, 7(5): 453-456
[Abstract](145) [FullText HTML] [PDF 132KB](0)
Abstract:
Terbium can form a stable binary chelate with terephthalic acid (benzene-1.4-dicarboxylic acid(TPA)) having a ratio of 1:2 in aqueous solution in the pH range of 5~6.The maximum excitation and emission wavelengths are 260 nm and 545 nm for terbium chelate,respectively.The fluorescence intensity of terbium chelate remains stable in 8 h with a relative standard deviation in the range of =4%.The rest or the lanthanide ions and the common foreign ions hardly interfere the determination.
THE CONSTANT PHASE ELEMENT (CPE) ON MnO2 ELECTRODE
Yuan GUO , Xi XIA
1996, 7(5): 457-458
[Abstract](179) [FullText HTML] [PDF 80KB](0)
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Ac impedance responses of electrolytic manganese dioxide (EMD) electrode are measured with EIS.It was found that the impedance responses are consistent with the constant phase element (CPE) form and calculated the fractal dimension of MnO2.
THE REACTION OF CALCIUM WITH WAZO-1 AND ITS BIOANALYTICAL APPLICATION
Zhen Hua CHEN , Zhong Yi YU , Quan YIN , Li XU , Ti Ping HE , Rong Sen SHEN
1996, 7(5): 459-462
[Abstract](172) [FullText HTML] [PDF 153KB](2)
Abstract:
A selective new reagent Wazo-1 was prepared.This paper studied the properties of its fluorescence and UV-Spectrum.A new fluorescence method for the determination of calcium is developed.Wazo-1 reac■s with calcium.forms calcium complex (Ex=297nm;Em=370nm).The interference of Mg(Ⅱ) has been studied.The reagent has better selectivity to Ca(Ⅱ) in the presence of large amount of Mg(Ⅱ).Flucrescence method has-been used for the determination of microamounts of calcium in serum with new reagent Wazo-1.The results obtained are favourable.
GRAFT COPOLYMERIZATION OF BUTYL ACRYLATE ONTO CASEIN INITIA BY POTASSIUM DIPERIODATOARGENTATE
Wei Hong LIU , Ying Hai LIU , Ya Juan SHANG , Ming Jun HAN , Lei SHI
1996, 7(5): 463-466
[Abstract](155) [FullText HTML] [PDF 131KB](0)
Abstract:
A new initiator,potassium diperiodatoargentate (Ⅲ),was used to initiate graft copolymerization of butyl acrylate(BuA) onto casein which showed a very high grafting efficiency.Grafting efficiency and percent conversion of monomer were evaluated in all cases.Infrared spectra and thermal analysis for casein and the grafting copolymer were taken to establish evidence for grafting.A possible initiation mechanism was proposed.
NATURAL BOND ORBITAL ANALYSIS OF RED ROUSSINATE AND BLACK ROUSSINATE
Zhi Da CHEN , Xiang Hui YI , Xian Ling KONG , Le Min LI , Jia Xi LU
1996, 7(5): 467-470
[Abstract](165) [FullText HTML] [PDF 154KB](0)
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In the purpose of study on the electronic structure feature for the activation center of the FeMo-cofactor of the nitrogenase as well as activation process of a dinitrogen molecule.the black Roussinate with an Fe4S3 cluster core is regarded as the first modeling complex.In this paper,natural bond orbitals for the cluster anions of the black Roussinate and the related red Roussinate are calculated on the basis of the first-order density matrixes obtained by the use of DV-Xα SCC method,leading to reasonable bonding patterns.
MCSCF AND VTST STUDIES OF THE REACTION CH(2π)+H2→CH3
Si Yu , Ruo Zhuang LIU
1996, 7(5): 471-474
[Abstract](158) [FullText HTML] [PDF 174KB](0)
Abstract:
The reaction path of the reaction CH(2π)-H2→CH3 is traced with IRC theory and MCSCF,6-31G method.On this basis,the dynamical properties and VTST rate constants are investigated.The results show that the curvature of the reaction path is considerable and its effects to rate constants are sensitive.
THE 4Σ- STATES OF THE FO RADICAL
Ming Bao HUANG
1996, 7(5): 475-478
[Abstract](163) [FullText HTML] [PDF 179KB](0)
Abstract:
For investigating the 4Σ-4Σ- transition in the FO radical to which an observed 268 nm ASE line has been attributed,the potential energy curves of the four lowest-lying 4A2 states of FO have been calculated using the MRSDCI method.The results indicate that the first 4Σ- (l4A2) and the upper 4Σ-(44A2) states are weakly bound and bound states respectively,and the 24A2 and 34A2 states are both repulsive states which are not relevant to the emission.The predicted Te value for the 4Σ-4Σ- transition is 4.62 eV,which is in excellent agreement with the photon energy value (4.63 eV) of the ASE line.The procedure of our MRSDCI calculations for excited states is described in detail,and the previous calculation results for these states are discussed.
THE CALCULATION OF THE FORCE CONSTANT BETWEEN DIVALENT METAL IONS AND THEIR LIGANDS
Zheng Yu ZHOU , Ji Yin ZHANGT , Xun Cheng SU
1996, 7(5): 479-482
[Abstract](152) [FullText HTML] [PDF 152KB](0)
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On the basis of the capture potential of force field and the adiabatic invariance proposed by Bates,the quadratic force constants between divalent metal ions in ⅡB group and ligands were calculated.Compared with the experimental results,the calculated contants are satisfactory and the reasons for the difference are given.
INVESTIGATION ON THE PHASE DIAGRAM OF TERNARY SYSTEM LaCl3-SrCl2-LiCl
Chao Gui ZHENG , Yan Ke ZHENG
1996, 7(5): 483-486
[Abstract](178) [FullText HTML] [PDF 128KB](0)
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The phase diagram of ternary system LaCl3-SrCl2-LiCl has been investigated by means of DTA.It was found that there were three fields corresponding to primary crystallization of LaCl3,SrCl2 and LiCl respectively,three univeriant curves related to the secondary crystallization,a ternary eutectic E(46.8% LaCl3,25.4% SrCl2,30.0%LiCl;469℃) in the system.A ternary reaction occurred in the system:L=LaCl3+SrCl2+LiCl
AN ESR STUDY OF MgO TREATED WITH SHOCK WAVE
Ting Lu YANG , Kang XU , Liang Bo FENG , Shi Kong SHEN
1996, 7(5): 487-490
[Abstract](170) [FullText HTML] [PDF 191KB](0)
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A MgO sample treated with shock wave was studied by using electron spin resonance(ESR) spectroscopy.An isotropic ESR singal at g=2.002 could be designated to F centers.O2superoxide ions penetrated into the surface layer of MgO powder after shocking were identified at gxx=2.006,gyy=2.009,and gzz=2.023,2.025.The change of surface adsorption ability for O2 of shocked MgO was discussed.
LEWIS ACIDIC SITES NOT ASSOCIATED WITH EXTRA-FRAMEWORK ALUMINUM IN DEHYDROXYLATED ZEOLITE HZSM-5
Tie Hong CHEN , Ping Chuan SUN , Ai Ju MEN , Zhong Yong YUAN , Zhen Ya GUO , Jing Zhong WANG , Da Tong DING , He Xuan LI
1996, 7(5): 491-492
[Abstract](164) [FullText HTML] [PDF 93KB](0)
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Zeolite HZSM-5 calcined at different temperatures were studied by29Si MAS NMR and EPR methods.It was concluded that in certain temperature range,dealumination did not necessarily occur simultaneously with framework dehydroxylation and thus framework Lewis acidic sites emerged.Two processes may be operative with one of them being predominant at different temperatures.
PROPERTIES OF ULTRAFINE SnOx THIN FILM MADE BY PLASMA POLYMERIZATION
Yong ZHANG , Kun Lin ZHOU , Wei Min CAO , Wei Min LIU
1996, 7(5): 493-494
[Abstract](156) [FullText HTML] [PDF 108KB](0)
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Ultrafine SnOx thin films were prepared from tetrabutyltin by RF glow dis charge polymerization. Annealing behaviour of films under air and gas-sensitive property were investigated.The ultrafine SnOx thin film with average particle size of 6nm exhibited a high sensitivity of 30 to 500ppm EtOH at 200℃.
A STUDY ON PHOTOELECTROCHEMICAL CHARACTERIZATION OF TiO2 NANOCRYSTALLINE THIN FILMS
Xue Ping LI , Wei Bo WANG , Xu Rui XIAO
1996, 7(5): 495-496
[Abstract](134) [FullText HTML] [PDF 95KB](0)
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Nanocrystalline TiO2 thin films have been prepared on a conducting glass surface by coating quantized TiO2 colloids.The photoelectrochemical properties of TiO2 thin films and their dependence on various factors have been studied.To obtain maximum photocurrent optimization of film thickness,sintering temperature and the pH of the electrolyte are very important.
ISS AND AES STUDIES OF CHANGES INDUCED ON Ni3Ti(0001) BY OXYGEN EXPOSURE
Li Jun YAO , Guo Xing XIONG , De Zheng WANG , Shi Shan SHENG , Heng Rong CHEN , Xie Xian GUO
1996, 7(5): 497-498
[Abstract](147) [FullText HTML] [PDF 104KB](0)
Abstract:
The surface compositional changes of Ni3Ti(0001) induced by oxygen exposure have been examined at different dosing temperatures.Oxygen induced segregation of titanium occurs rapidly above 500℃,but only rearrangement betweeen nickel and titanium in the outer two or more layers occurs upon oxygen exposure at room temperature.Oxygen atoms penetrate into the sublayers of Ni3Ti(0001) at 500℃ and reside mainly on the surface at room temperature.
DOUBLE SUBSTITUTE CALIBRATION FOR THE ISOTOPIC RATIO MEASUREMENT AMONG RARE EARTH ELEMENTS
Tsing Lien CHANG , Dun Min ZHAO
1996, 7(5): 499-502
[Abstract](146) [FullText HTML] [PDF 114KB](0)
Abstract:
Through the application of the method of double substitute calibration using the true isotopic ratios of cerium and europium of our laboratory standards,the atomic weight of ytterbium has been determined as A(Yb)=173. 0428(15) on 2σ basis.
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