- Production method of metamitron
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The invention discloses a production method of metamitron. The production method is characterized by comprising the following steps that benzoyl cyanide is hydrolyzed under the condition of H2SO4, and is then alcoholized into ester; hydrazine hydrate and methyl acetate take reaction to generate acetyl hydrazine hydrate; methyl benzoylformate and the acetyl hydrazine hydrate take reaction to generate hydrazine hydrate ester under the condition of H2SO4; hydrazine hydrate ester suspension and hydrazine hydrate take reaction; acyl is subjected to hydrazine treatment again to generate benzoyl hydrazine, and byproducts of methyl alcohol and water are generated; the benzoyl hydrazine is subjected to distillation, backflow, dehydration, cyclization and crystallization under the condition with a butanol solvent and a catalyst to generate the metamitron. The production method has the advantages that the cost of phase transfer catalysts is low; the cost of sodium benzoate is lower than that of sodium acetate, so that the production cost is reduced.
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