1995 Volume 6 Issue 7

O-(1-BENZOTRIAZOLYL)-SULFATE AS ALEAVING GROUP IN SUBSTITUTION OF NUCLEOSIDE
Yao Shu ZHANG , Lai Xin WANG , Li He ZHANG
1995, 6(7): 549-552
[Abstract](167) [FullText HTML] [PDF 162KB](0)
Abstract:
5'-Amino adenosines were synthesized by substitution of 5'-O-(1-benzotriazolyl)-sulfonyl adenosine with various amines in very good yields.
FACILE AND SELECTIVE REDUCTION OF NTIROARENES IN THE PRESENCE OF NITRILES WITH NaBH4-BiCl3 SYSTEM
Ping Da REN , Shi Feng PAN , Ting Wei DONG , Shi Hui WU
1995, 6(7): 553-554
[Abstract](166) [FullText HTML] [PDF 72KB](1)
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Nitroarenes were selectively reduced to primary amines by treatment with sodium borohydride bismuth chloride in the presence of nitrites.The selectivity was always excellent.
SYNTHESIS OF OLIGONUCLEOTIDE d-(CCGTACGG) via HELP METHOD
Gen Bin SHI , Kai Xian CHEN , Zu Sheng XU , Zai Wan YANG , Ru Yun JI
1995, 6(7): 555-556
[Abstract](170) [FullText HTML] [PDF 125KB](0)
Abstract:
In this paper, we report the chemical synthesis of oligonucleotide d-(CCGTACGG) using new HELP method.
CYCLOPROPANATION OF ENAMINE AND ETHYL DIAZOACETATE CATALYZED BY COPPER COMPLEX
Min WANG , Ming An WANG , Bing Fang HU
1995, 6(7): 557-558
[Abstract](173) [FullText HTML] [PDF 63KB](1)
Abstract:
The reaction of enamine with ethyl diazoacetate catalyzed by N-α-(4-chlorophenyl)-isobutyl(salicylaldimino) copper complex gives cyclopropanation product with a yield of about 12%.
SYNTHESIS OF 7-DEOXY-1, 2, 10, 20-TETRAHYDROTAXAMAIRIN B
Xue Chao WANG , Yu Xin CUI , Xin Fu PAN , Yao Zu CHEN
1995, 6(7): 559-560
[Abstract](164) [FullText HTML] [PDF 74KB](0)
Abstract:
A ten-step synthesis of 7-deoxy-1, 2, 10, 20-tetrahydrotaxamairin B(5), a key precursor for taxamairin A(1), B(2), has been achieved.A Friedel-Crafts annunation is the key step.
APPLICATION OF SOME PHOSPHORUS REAGENTS IN MANNICH-TYPE REACTION
Ru Yu CHEN , Qing DAI
1995, 6(7): 561-564
[Abstract](155) [FullText HTML] [PDF 86KB](0)
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Some phosphorus reagents were applied to the Mannich-type reaction of carbamate and p-toluenesulfonamide so that some important intermediates for the synthesis of phosphonopeptides were obtained easily.The structures of products were confirmed by 1HNMR and elemental analyses.
TRIALKYL PHOSPHITES DIRECTLY CONVERTED TO DIALKYL ALKYLPHOSPHONATE IN THE ABSENCE OF ALKYL HALIDES
Chuan Fang ZHU , Hai Yan XIAO
1995, 6(7): 565-568
[Abstract](155) [FullText HTML] [PDF 128KB](0)
Abstract:
By refluxing with cuprous halides in acetonitrile trialkyl phosphites can be directly converted into the corresponding dialkyl alkylphosphonate.The conversion of trialkyl phosphites with cuprous iodide is more favorable than with cuprous chloride;The activity of the alkyl group for the rearrangement is in the order of Me> Et> butyl.
SYNTHESIS AND CHARACTERIZATION OF C60NAr,THE FIRST AZIRIDINE FULLERENE DERIVATIVE
Jun FENG , Ji Sheng LI , Guo Xiao DONG , Gai Jiao JI
1995, 6(7): 569-572
[Abstract](158) [FullText HTML] [PDF 143KB](1)
Abstract:
Fullerene derivatives C60NAr 2 were synthesized by the reaction of fullerene C60 with p-substituted phenyl azides in refluxing chlorobenzene.The structure of each product was elucidated on the basis of FD-MS、UV-Vis, IR, 1H NMR and 13C NMR as a closed aziridine at a 6/6-ring junction.
SYNTHESIS AND PHOTOCHROMIC BEHAVIORS OF 1-LONG HYDROCARBON CHAIN SUBSTITUTED PYRRYL FULGIDES
Wei Li ZHAO , Zu Liang DU , Zi Qiang ZHU , Lian He YU , Yang Fu MING , Mei Gong FAN
1995, 6(7): 573-576
[Abstract](159) [FullText HTML] [PDF 134KB](0)
Abstract:
Three 1-long hydrocarbon chain substituted pyrryl fulgides, (2, 4-dimethyl-1-hexadecyl-5-phenyl-3-pyrryl)-ethylidene(isopropylidene)succinic anhydride(1E), (2, 4-dimethyl-1-octadecyl-5-phenyl-3-pyrryl)-ethylidene(isopropylidene)succinic anhydride(2E)and(2-methyl-1-(p-octadecoxyphenyl)-5-phenyl-3-pyrryl)-ethylidene(isopropylidene)succinic anhydride(3E)were synthesized.Their photochromic behaviors were also investigated.Compound 3E was obtained in much higher yield(41.7%)than others with an improved procedure.
STRUCTURE ASSIGNMENT FOR EPIMERIC THYMIDINE-3'-YL BENZOIN PHOSPHATES
Xin CHEN , Yu Ping FENG , Nan Jing ZHANG , Yu Fen ZHAO
1995, 6(7): 577-580
[Abstract](158) [FullText HTML] [PDF 100KB](0)
Abstract:
Reaction of oxyphosphorane (1) with thymidine (2) followed by hydrolysis under mild conditions afforded TMP, TpT and thymidine-3'-yl benzoin phosphates (3).The structures of 3 were determined by 31P, 1H, 13C NMR and mass spectral data, and 31P-1H COSY experiments.The possible formation mechanism of 3 was also discussed.
A NEW. NEO-CLERODANE DITERPENE FROM AJUGA NIPPONENSIS
Zhun LIU , Zhong Qin LI , Chun Xing ZHANG , Ru Yu CHEN , Ye Guang ZHANG , Yu Tong QIU , Shan Huan ZHAO
1995, 6(7): 581-582
[Abstract](159) [FullText HTML] [PDF 86KB](0)
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This paper describes the structural elucidatioa of a new insecticidal neo-clerodane diterpeae Ajugamarin L2 from Ajugs nipponeasis.based on spectral data and X-ray diffraction analysis as 4, 18-epoxy-6α-hydroxy-19-tigloyloxy-neo-cierod-13(14)-en-15, 16-olide.
A NEW SESQUITERPENE FROM LIGULARIA NELUMBIFOLIA
Hai Ruo PENG , Zhong Jian JIA , Li YANG , Yu ZHAO
1995, 6(7): 583-584
[Abstract](159) [FullText HTML] [PDF 86KB](0)
Abstract:
A new guaiane sesquiterpene was isolated from Ligularia Nelumbifolia.Its structure was elucidated by spectroscopic methods including 2D-NMR techniques and showed to be 4α, 9α, 10β-tri-acetoxy-1β, 5α-guaia-6-ene(1).
TWO NEW SESQUITERPENOIDS FROM TUSSILAGO FARFAR L.
Wei SHI , Gui Qiu HAN , Jian Jun GAO
1995, 6(7): 585-586
[Abstract](156) [FullText HTML] [PDF 91KB](0)
Abstract:
Two new sesquiterpeuoids.named as tussilagonone Ⅰ(1)and neotussilagolactone Ⅰ(2), were isolated from the dry flower bud of Tussilago farfara L., Their structures were elucidated by the spectroscopic methods.In the test of platelet aggregation caused by platelet activating factor(PAF), compounds 1 and 2 were active.
A NEW CHROME GLYCOSIDE FROM SMILAX GLABRA ROXB
zheng zhong CAO , Yi Jun YI , Yuan CAO , Zong Kang LENG
1995, 6(7): 587-588
[Abstract](164) [FullText HTML] [PDF 57KB](0)
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A new chrome glycoside, 5, 7-dihydroxychromone-3-O-L-rhamnopyranoside, named smiglanin, was isolated from the root of Smilax glabra collected in Lanxi, Zhejiang province.Its structure was elucidated by special data and chemical evidence.
DETERMINATION OF FLAVONOID COMPOUNDS IN GINGKO BILOBA LEAVES SUPERCRITICAL FLUID EXTRACTION AND HIGH PERFORMANCE LIQUID CHROMATOGRAPHY (SFE/HPLC)
Wei Xi YAO , Xiang Mei CHENG , Yuan Qi ZHANG
1995, 6(7): 589-592
[Abstract](164) [FullText HTML] [PDF 143KB](0)
Abstract:
This paper discussed the determination method of flavonoid compounds in Gingko biloba leaves with supercritical CO2 and HPLC, The method is simple and accurate.It can eliminate the toxicity of residual solvents in organic solvent extracts.The average recovery is 87.3%(n=4), relative standard deviation(RSD)is 5.4% and the method detection limit(MDL)is 28ppb.The flavonoid content determined was 1.4%(w/w)in Gingko biloba leaves.
A NEW KINETIC FLUOROMETRIC METHOD FOR THE DETERMINATION OF EPINEPHRINE
Xin Guo WU , Ru Xiu CAI , Zhi Xin LIN , Jie Ke CHENG
1995, 6(7): 593-596
[Abstract](162) [FullText HTML] [PDF 157KB](0)
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A new kinetic method based on detecting the intermediate products in successive reactions is described.The special bandshape kinetic curve is essential to establish the method.Epinephrine is determined selectively by this method in four catecholamine mixtures.
INTRA-ION PAIR ELECTRON TRANSFER OF PHOTOEXCITED METHYLENE BLUE BORATE
Xiu Zhi WANG , Han Qing CHEN , Er Jian WANG
1995, 6(7): 597-600
[Abstract](168) [FullText HTML] [PDF 126KB](0)
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The photochemical reaction of methylene blue(n-butyltriphenyl) borate, MBRBPh3 was examined.The ultrafast quenching rate and large negative value of △G indicated that the intra-ion pair ET plays an important role in photoreaction of MBRBPh3.The sequent boron-carbon bond cleavage of butyltriphenylboranyl radical intermediate was found by GC-MS and photo-CIDNP studies.
ESTLMATION OF THE pH VALUES OF ACIDIC SURFACE WATERS BY CHEMICAL EQUILIBRIUM CALCULATION
Shu Ping BI
1995, 6(7): 601-604
[Abstract](157) [FullText HTML] [PDF 138KB](0)
Abstract:
Chemical equilibrium calculation for predicting the pH values and buffering capacity of acidic natural surface waters was developed.Effects of various influence factors were investigated through theoretical analysis.Some valuable conclusions are obtained.
STUDY ON CARBOXYL-CONTAINING STARCH IN HEAVY METAL REMOVAL
Zhong Ai HU , Xin Xin ZHOU , Li ZHANG , Yue Hua GUO , Hong Ying WU
1995, 6(7): 605-608
[Abstract](161) [FullText HTML] [PDF 154KB](0)
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Water-insoluble carboxyl-containing starch graft polymers were prepared.Residual metal ion concentrations in solutions treated with the insoluble starch graft polymers were measured in different pH.The mechanism of removing heavy-metals from aqueous solutions with the carboxylated starchs was described.
STUDY ON SYNTHESIS,CHARACTERIZATION AND CATALYSIS OF PILLARED ANION CLAY(Ⅲ)——SYNTHESIS OF ZnAl-BW11O39Z(H2O)n-
Chang Wen HU , Qing Lin HE , Yong Hua ZHANG , Tian Di TANG , En Bo WANG
1995, 6(7): 609-612
[Abstract](166) [FullText HTML] [PDF 121KB](1)
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ZnAl hydrotalcites have been intercalated by THPOMs[BW11O39Z(H2O)n-(Z=Ni2+, Cu2+ and Al3+)] via both hydrothermal reaction and ion exchange reaction.The spectra of powder X-ray diffraction and IR show that the synthesized complexes pillared by THPOMs are layered compounds with gallery heights of 9.7~9.9Å, The anions entering the layer retain their Keggin structure.
CATALYTIC PROPERTIES AND SURFACE STRUCTURE OF MgO PREPARED FROM VARIOUS PRECURSORS
Jian Wen DA , Shi Kong SHEN
1995, 6(7): 613-616
[Abstract](162) [FullText HTML] [PDF 175KB](0)
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The catalytic performances and surface properties of MgO prepared from different precursors were studied using catalytic test and pulse reaction techniques.It was indicated that the MgO prepared from Mg(OH)2·4MgCO3·6H2O pretreated with distilled water exhibited the highest activity for the oxidative coupling of methane.High lattice oxygen mobility and strong surface basicity may favor the OCM reaction.
SELECTIVE DIMERIZATION OF BUTANAL TO BUTYL BUTYRATE CATALYZED BY LANTHANOCENE/n-BuLi SYSTEMS
Fan XU , Li Lu ZHANG , Ying Ming YAO , Yuan Chen DING , Zhi Min BAI , Qi SHEN
1995, 6(7): 617-620
[Abstract](155) [FullText HTML] [PDF 123KB](0)
Abstract:
Lanthanocene complexes Cp'2LnCl(Cp'=ButCp, Ln=Yb, Er;Cp'=MeCp, Ln=Yb)or Cp'LnCl2(Cp'=ButCp, Ln=Yb, Nd;Cp'=MeCp, Ln=Yb) together with BuLi were first found to catalyze the selective dimerization of butanal to butyl butyrate in moderate yields under mild conditions.The yields were found to be influenced by the structure of lanthanocene complexes.
NONLINEAR DYNAMICS IN THE SOL-GEL PROCESS
Yue Hua CHEN , Gou Lin GUO , You Chi TANG , Chun ZHAI
1995, 6(7): 621-624
[Abstract](158) [FullText HTML] [PDF 135KB](0)
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29Si NMR is used to measure the concentration of the various functional groups in an acid catalyzed Si(OEt)4:EtOH:H2O sol-gel systems.The corresponding rate expressions for the reactions are shown in equations(1-3).The non-linear dynamics in the sol-gel process has been discussed.The molecular structure is changeable as the reactions proceed and the diffusion of clusters is spatially constrained.These factors iead to an anomalous kinetics, The overall rate coefficients have been got from numerical solution.
PREPARATION OF POLYURETHANE EMULSION
Qing Ye ZHOU , Mou Dao SONG , Bang Hua ZHANG , Bing Lin HE
1995, 6(7): 625-626
[Abstract](158) [FullText HTML] [PDF 116KB](0)
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A technique has been developed for preparing stable polyurethane emulsion which provides thermosetting film without the use of emulsifying agents.The reaction of an isocyanate terminated prepolymer with a stoichiometric excess of diethylenetriamine in the presence of ketones yields the poly(urethane-amine).Then the free amino group is generated when the polymer is treated with epichlorohydrin and the reaction occurs between them, and a stable self-emulsifiable thermosetting urethane emulsion can be obtained.This paper also presents the effect of the curing temperature and time on the typical mechanical properties of the films from this urethane emulsion.
FLUORESCENCE AND ITS ENHANCEMENT OR QUENCHING OF Eu(TTA)3 Phen LB FILMS
Ren Jie ZHANG , Hong Guo LIU , Cheng Ru ZHANG , Kong Zhang YANG , Zhi Kun SI , Gui Yun ZHU
1995, 6(7): 627-630
[Abstract](171) [FullText HTML] [PDF 195KB](0)
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For the first time, LB films containing Eu(TTA)3 Phen are obtained by using composite subphase.Eu(TTA)3 Phen itself is difficult to be transferred onto solid substrate, mixed or alternate LB films are prepared.Hydrogen bonds form between Eu(TTA)3 Phen and AA or TPP(-COOH).TOPO and SB have a fluorescence enhancement effect on Eu(TTA)3 Phen.TPP(-COOH)and Fc have a fluorescence quenching effect on it.
THE INFLUENCE OF HEAT TREATMENT ON POLYAMIDE-1010 STRUCTURES OF THE AGGREGATED STATE
Hong Fang ZHANG , Bao Quan YANG , Li Hua ZHANG , Zhi Shen MO
1995, 6(7): 631-632
[Abstract](155) [FullText HTML] [PDF 74KB](0)
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The structural parameters of the aggregated state under various heat treatment for PA-1010 samples were computed by means of the desmearing intensity from SAXS, and by using the concept of the distance distribution function and 1D EDCF method.The results revealed that the maximum values of Q, I(O), Pmax(Z), dtr, Rg and Wc, x were obtained nearby T=175℃ for PA-1010 samples with various annealing treatment.The higher degree of the crystallinity, the greater values of all the structural parameters of the aggregated state for PA-1010 samples were.
BAND ELECTRONIC STRUCTURES OF SYNTHETIC METAL BISDITHIOLENE DERIVATIVES
Yong ZHANG , Lin Feng LI , Xiao Zeng YOU , Yue Ming Sun
1995, 6(7): 633-636
[Abstract](135) [FullText HTML] [PDF 132KB](0)
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Energy band calculations of tetrathiafulvalene-metal bisdithiolenes(C6S8M)(M=Ni, Pt)with the extended Hückel molecular orbital(EHMO)method show that the multiple overlaps among frontier molecular orbitals(FMO)and the small band gap account for their conducting properties.Their estimated conductivities are in good agreement with experimental data.FMO are mainly composed of ligand orbitals.Differences of the band structures between polymers and layered salts with the same building block are revealed.
STUDIES ON THE NON-ISOTHERMAL KINETICS OF THERMAL DECOMPOSITIONS OF THE COMPLEXES OF Cd(Ⅱ)WITH O-VANILLIN THIOSEMICARBAZONE AND IRON(Ⅲ)WITH 2-(O-HYDROXYBENZYLIDENE)AMINO]PHENOL AND PYRIDINE
Qing Ping HU , Xue GuI CUI , Zhao He YANG
1995, 6(7): 637-640
[Abstract](135) [FullText HTML] [PDF 181KB](0)
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The thermal decompositions of the complex of Cd(Ⅱ)with o-vanillin thiosemicarbazone(complex 1)and the mixed ligand complex of iron(Ⅲ)with 2-[(o-hydroxybenzylidene)amino]phenol and pyridine(complex 2)and their non-isothermal kinetics have been studied by TG and DTG techniques.The non-isothermal kinetic data were analyzed and the kinetic parameters for the first and second steps of the thermal decompositions were evaluated by two different methods——differential and integral methods.Their kinetic equations were obtained.
PARAMAGNETIC AND DIAMAGNETIC DICOPPER(Ⅱ) COMPLEXES WITH DI-SCHIFF BASE DERIVED FROM 2-HYDROXY-1-NAPHTHALDEHYDE AND1, 3-DIANINO-2-PROPANOL
Pang CHENG , Dai Zheng LIAO , Shi Ping YAN , Zong Hui JIANG , Geng Liu WANG
1995, 6(7): 641-644
[Abstract](126) [FullText HTML] [PDF 136KB](0)
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Four new binuclear copper(Ⅱ)complexes[Cu2(L)(μ-X)]have been synthesized and characterized, where X=C6H5COO(1), C2H5COO(2), pyrazolate(C3H3N2)(3)and 1, 3-N3(4).The ligand H3L is a 2:1 Schiff base derived from 2-hydroxy-1-naphthaldehyde and 1, 3-diamino-2-propanol.The variable temperature magnetic analyses show that complexes(1), (2)and(3)are paramagnetic with 2J=-158~-188 cm-1, and complex(4)is diamagnetic with|2J|>1000 cm-1.
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