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Current Issue
1994 Vol.11 Issue.4,
Published 1994-10-15
Article
Article
1
The Synthesis of 2、4-Dimethoxyacetoacetanilide
Mu Zhenyi;Zhou Xiaojian
In this paper, the preparation of 2、4-dimethoxyacetoacetaniline from mdichlorobenzene by nitration, methoxylation, reduction and acidation was studied. 2、4-Dichloronitrobenzene was prepared by the nitration of m-dichlorobenzene with mixed acih with 84% yield and 98% purity.Methoxylation was catalyzed by quaternary ammonium salts or polythyene glycol as phase transfer catalysts, which could shorten the reaction time and increase the yield. 2、4-Dimethoxyaniline was synthesized from nitro-compound by reducing with iron powder in solvent, the yield of the product was 84%.2、4-Dimethoxyacetoacetanilide was obtained by using 2、4-dimethoxyaniline reacted with diketone, yield was 89%.
1994 Vol. 11 (4): 1-7 [
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420
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8
Graft-Modification of Gelatin Using Different Initiating Systems
Gao Jianping;Li Zhichong
The graft-modification of gelation with vinylpyrrolidone using different initiating systems has been studied.The results indicated that the graft copolymerization was greatly effected by the properties of initiator, the reaction temperature and the concentration of monomer.So the desired graft copolymer can be produced by choise of the appropriate reaction conditions under the suitable initiator.
1994 Vol. 11 (4): 8-14 [
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1720
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412
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15
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Huang Meirong; Li Xingui
null
Guide:
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1994 Vol. 11 (4): 15-20 [
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1656
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424
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1994 Vol. 11 (4): 21-23 [
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1546
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8
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24
1994 Vol. 11 (4): 24-29 [
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1492
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9
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29
1994 Vol. 11 (4): 29-36 [
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1501
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9
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37
1994 Vol. 11 (4): 37-41 [
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1531
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9
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42
1994 Vol. 11 (4): 42-45 [
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1432
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9
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46
1994 Vol. 11 (4): 46-48 [
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1511
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8
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49
1994 Vol. 11 (4): 49-52 [
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1482
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8
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53
1994 Vol. 11 (4): 53-58 [
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1407
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9
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59
1994 Vol. 11 (4): 59-59 [
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1388
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10
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