Method for synthesizing bromacil technical
A synthesis method and technology of the original drug, applied in directions such as organic chemistry, can solve the problems of reduced reaction yield, low utilization rate of bromine, loss of solvent acetic acid, etc., and achieve high utilization rate of bromine, good quality and reduced cost. Effect
Active Publication Date: 2011-01-26
宁夏一帆生物科技有限公司
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But there are following defects in this method: the one, the solvent acetic acid that reclaims has loss; , so that the cost of raw materials for the entire process remains high; the third is the problem of excessive acidity of wastewater discharge
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The invention relates to a method for synthesizing herbicide, in particular to a method for synthesizing bromacil technical. The reaction formula in the method for synthesizing the bromacil technical is as the above. The method adopts water as solvent, leads the whole reaction to be performed in water phase, is clean and environment friendly, solves the problem that solvent can not be reclaimed for multiple times when ethylic acid is adopted as solvent in the prior art, does not require sodium acetate and need no side pressure to remove the solvent, thereby shortening the production period; meanwhile, HBr generated in an oxidation reaction of hydrogen peroxide with low price is adopted, and the utilization ratio of bromine is improved to 98 percent from 45 percent of the prior art, so that the whole reaction can be better carried out towards the positive reaction, the yield is improved to 98 percent from 92 percent of the prior art, and the cost of raw materials and production is reduced.
Description
technical field The invention relates to a method for synthesizing herbicides, in particular to a method for synthesizing the original drug of weededil. Background technique Herbicide is a non-selective herbicide, mainly used to control perennial grassy weeds and annual weeds in non-cultivated areas, citrus orchards, pineapple orchards and other places. Its chemical name is 5-bromo-3-sec-butyl-6-methyluracil, its common name is bromacil, and its structural formula is: At present, the synthetic method commonly used in China is to use 3-sec-butyl-6-methyluracil as the starting material, use acetic acid as the solvent, add sodium acetate buffer, and react with excess bromine, and finally obtain the bromide medicine. But there are following defects in this method: the one, the solvent acetic acid that reclaims has loss; , so that the cost of raw materials throughout the process remains high; the third is the problem of excessive acidity of wastewater discharge. Contents ...
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IPC IPC(8): C07D239/553
Inventor吴正绍王学胜吴贯中
Owner宁夏一帆生物科技有限公司