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《Agrochemicals》 2019-01
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Synthesis of Herbicides Ipfencarbazone

LIU An-chang;ZHENG Yi-qian;WANG Yan-lu;BAO Yang;HUANG Shi-xiang;School of Chemical and Pharmaceutical Engineering, Wuhan Institute of Technology;  
[Aims] For improving synthetic process and raising yield. [Methods] N-Isopropyl-2,4-difluoroaniline which was prepared by alkylation of 2,4-difluoroaniline with 2-bromopropane on N atom, reacted with solid phosgene to obtain the intermediate of N-isopropyl-N-2,4-difluoro phenylcarbamoyl chloride. The 2,4-dichlorophenylhydrazine hydrochloride was synthesized through diazotization with sodium nitrite, followed by reduction with sodium sulfite using2,4-dichloroaniline as raw material, then it reacted respectively with formaldehyde, sodium cyanate and hypochlorous acid to obtain the 1-(2,4-dichlorophenyl)-1,2,4-triazole-5-one, finally, N-isopropyl-N-2,4-difluorophenylcarbamoyl chloride reacted with 1-(2,4-dichlorophenyl)-1,2,4-triazole-5-one to obtain the target product ipfencarbazon. [Results] The product obtained was identified by1 H NMR, and the structure was consistent with that of triazolamide. [Conclusions] This process is simple, warm and economical, which is suitable for industrial scale manufacture.
【CateGory Index】: TQ457
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Chinese Journal Full-text Database 1 Hits
1 ZHANG Juan~(1,2) FAN Xiao-dong~1,LIU Yi-feng~2,LI Hua~2(1.Department of Chemical Engineering,Northwestern Polytechnical University,Xi′an 710072,China;2.Applied Chemical Institute,Northwest University,Xi′an 710069,China);A study on synthesis of 1-substituted-1,2,4-triazolin-5-one by triethyl orthformate method[J];西北大学学报(自然科学版);2006-03
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Chinese Journal Full-text Database 2 Hits
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