High-yield ethyl chrysanthemate preparation method
A high-yield technology of ethyl chrysanthemum acid, applied in the field of chemical technology, can solve the problem of low chemical yield, and achieve the effects of reducing poisoning and excellent environmental protection performance
Active Publication Date: 2020-11-24
湖北中灏科技有限公司
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The invention belongs to the technical field of chemical processes, and specifically relates to a high-yield ethyl chrysanthemate preparation method. The high-yield ethyl chrysanthemate preparation method comprises the following steps: (1) diazotization: a step of adding water, glycine ethyl ester acid salt, glacial acetic acid and dimethyl carbonate as solvents into a diazotization kettle, dropwisely adding a sodium nitrite aqueous solution into the diazotization kettle, and carrying out a reaction so as to a diazo liquid; (2) cyclization: a step of putting 2,5-dimethyl-2,4-hexadiene into a cyclization kettle, and carrying out a reaction with cuprous chloride as a catalyst so as to obtain a cyclized solution; (3) desolventizing: a step of sending the cyclized solution into a high-yield desolventizing tower to remove the solvents so as to obtain a crude ethyl chrysanthemate product; and (4) distillation: a step of putting the crude ethyl chrysanthemate product into a distillation kettle, and carrying out vacuum distillation so as to obtain the high-purity ethyl chrysanthemate. The high-yield ethyl chrysanthemate preparation method provided by the invention has the following beneficial effects: when the dimethyl carbonate is used as a solvent, a diazotization reaction can be carried out more completely, so the loss of raw materials is reduced; and meanwhile, the yield of ethyl chrysanthemate in the subsequent cyclization reaction can be improved.
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Technology Topic
DiazoChrysanthemic acid ethyl ester +14
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