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Table of Content
24 April 1989, Volume 5 Issue 2
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Articles
studies on the Mechanism of Producing Tungstic Acid by Complex-Homogeneous Precipitation Method
Jiang Anren, Pang Zhen
1989, 5(2): 112-119.
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Projects Supported by the National Fund of Natural Sciences
Synthesis and Structure of Large Single Crystal of TPAF-AlPO
4
-5 Molecular Sieve
Qiu Shilun, Pang Wenqin, Xu Ruren
1989, 5(2): 120-124.
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A large single crystal of TPAF-AlPO
4
-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride.Starting material composition was · 1 P
2
O
5
· 1 Al
2
O
3
· 2.2 TPAOH · 1.7 NH
4
F ·318 H
2
O.The crystal size has a hexagonal prism with 80μm across and 500μm length.The structure of tetrapropylarnmonium fluoride-aluminium phosphate type-5 was investigated with X-ray diffraction.The unit cell composition is 12AlPO
4
· TPAF, space group P6cc (a=13.740(5), c=8.474(4)Å).Average bond distances are: P-O 1.564Å and Al-O 1.640Å ,which may be due to the partial disorder of the arrangement of P, Al in the framework.The angles of O-T-O and T-O-T (T=P, Al) are 102-116° and 148-176°, respectively.Residue electron density was not well enough defined to give a precise position for tetrapropylammonium fluoride (TPAF).The template agent, TPA
+
cations, situate in the 12-ring channels and F
-
anions locate in double 4-rings near the 12-ring channels.
Studies on the Relationship Between the Structure and Anticonvulsant Activity of Cinnamamides and Their Analogs
Wang Shuyu, Li Renli, Liu Weichin
1989, 5(2): 125-137.
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On the basis of systematic modification of the structure of componds of antiepilepsirine type, more than 200 cinnamamides were synthesized and tested by animal assay (maximal electroshock seizure, MES).Pharmacological evaluation showed that the configuration and the substituents on the phenyl ring and the nitrogen of amides, and substituents on the double bond displayed an important effect on the anticonvulsant activity.For studying the effect of the modification of structure to anticonvulsant activity, Hansch approach was employed to study the QSAR among 38 cinnamamides, and Hopfinger's MSA was employed to study the MSA-QSAR among 26 cinnamamides.
The Reactions of 1-Acetothiosemicarbazidc with P（NR
2
）
3
PC1
3
and PCI
5
Zhang Jingling, Xu Wei
1989, 5(2): 138-146.
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A Series of new heterocyciophosphorus compounds were synthesizec oy cyclocondensa-tion of 1-acetothiosemicarbazide with P(NR
2
)
3
.The further reaction of these compounds with P(NR
2
)
3
gave different compounds depending upon different reaction conditions.The 1-acetothiosemicarbazide can also condense with PCl
3
and PCl5 similarly, The reaction mechanism, the spectral properties and chemical properties of these products were also studied and discussed.
Studies on Amidothiosemicarbazides and Related Hcterocyclic Derivatives (XIII)--Synthetic Studies on 2-(3-Pyridyl)-5-Arylamino-1,3, 4-Thiadiazoles and Oxadiazoles
Zhang Lixue, Zhang Ziyi
1989, 5(2): 147-157.
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By ring-closure of 1-nicotinyl-4-arylthiosemicarbazides under the catalysis of concentrated sulfuric acid or mercuric acetate, a series of 2-(3-pyridyl)-5-arylarnino-1,3,4-thiadiazoles and 2-(3-pyridyl)-5-ary-lamino-1,3,4-oxadiazoles were synthesized, respectively.All the products were subjected to testing of biological activity.Furthermore, the IR,
1
H NMR and MS spectral properties of these new compounds were studied in details and some significant conclusions were drawn.
Synthesis of C-Glucosides from Grignard Reagents Prepared by Activated Magnesium
Qiu Dongxu, Wang Yanfeng, Cai Mengshen
1989, 5(2): 158-163.
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l-α-biaomo-2,3,4,6-tetra-O-acetyl-D-giucopyranose reacts with Grignard eagents prepared frorn the acnvated magnesium under very mild condition to ellord C-glucosides in a very high yield compared with Grignard Reagent prepared from usual method.β-anomer predominates in the reaction, mixture The configuration of anomers was assigned by
13
C NMR spectra.
Eleciroreduction of Oxygen on Pyrolytk Graphite Electrode wish Adsorbed Layer of Cobalt Tetra.sulfonaied Phthalocyaninc In Acetonitrile and Dimethylformamide
Huang Chubao, Tryk D., Yeager E.
1989, 5(2): 164-170.
Abstract
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The catjpdoc polarization characteristics indicate that the presence of a pre-adsorbed surface layer of CoTSPc innibits the reduction of O
2
to O
2
-
on an ordinary pyroiytic graphite electrode (OPG) in AN and DMF solution of 0.1 mol/L, TEAP, The transfer coefficient a and the heterogeneous rate constant k for this reaction or, OPG with and without pre-adsorbed CoTSPc obtained by rotating disk electrode method were found to be fairly close to thar obtained by cyclic voltammetry.The a remains almost the same, bat the k de creases by a factor of 2-5 with CoTSPc as compared with OPG alone.The possible reason is that the adsorbed CoTSPc as an anion renders the effective potential diffaence less negative, which thus lowers the rase of O
2
reduction.
Miceliization and Surface Adsorption of Tetraethylammonium Perfluorooctanesulfonate in Mixed Solvents
Zhao Guoxi, Zhou Yaping
1989, 5(2): 171-178.
Abstract
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)
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The surface tension and cenductivity of tetracthylarnmomum perfluorooctanesulfonate (TEPFOS) solu-tions in mixed solvents were determined The criticsl micelle concentrations (cmc) and surface adsorption of TEPFOS in various solvents (Dimetbylsulfoxlde and DMSO, formamide and FA, and DMSO-H
2
O and FA H
2
O mixtures) were calculated from the above experimental date.The results show that the surface activity of TEPFOS is much higher than that of typical hydrocarbon surfactant, sodium dodecylsulfate (SDS); the melecalar interaction (in terms of colubility araneter or surface tension) of solvent is the decisive factor in sffecting the cmc of TEPFOS , in the apretic solvent DMSO, the value of entropy change during micelliza-tion of TEPFOS may beecme subsantially negative; the surfaof adsorption amount of TEPFOS is the largest in H
2
O, smaller in FA , and the smallest in DMSO.
Heuristic Backtrack Algorithm for Structural Match and Its Applications
Xu Jun, Zhang Maosen
1989, 5(2): 179-186.
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The concept WALKING on structures is proposed, and the partial ordering between a structure and a query structure (substructure) is also created by means of WALKING.Based upon the above concepts, authors create the Heuristic-Backtracking Algorithm (HBA) of structural match with high performance.In the last part of the paper, the applications of HBA in molecular graphics, synthetic planning, spectrum simulation , the representation and recognition of general structures are discussed.
Framework Structure of a Synthetic High Silica Zeolite--ZSM-39 from a C
2
H
4
（OH）
2
-H
2
O Mixed Solvent System
Yang Guangdi, Feng Shouhua, Xu Ruren
1989, 5(2): 187-189.
Abstract
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)
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Enrichment of Trace Cerium by Liquid Membrane and Its Determination by Spectrophotometry
Li Yongtao, Xu Shushen
1989, 5(2): 190-194.
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)
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The Interaction Between Sodium Dodecylsulfate (SDS) and Eriochrome Azurol B (ECAB) or Chromazurol S (CAS)
Zheng Yongxl, Chu Jinjing
1989, 5(2): 195-198.
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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