The invention discloses a new method for producing
propiconazole, comprising the following steps of: cyclizing 2,4-dichloroacetophenone and 1,2-pentanediol, brominating with
bromine to generate 2-brooethyl-(2,4-dichlorophenyl)-4-propyl-1,3-
dioxolane, then condensing with 1,2,4-tolyltriazole
sylvite to prepare a crude product, and desolventizing, washing and distilling the crude product in vacuum to obtain the
propiconazole. When the brominating reaction is carried out after the cyclizing reaction is finished, the
bromine is added for twice, firstly the
bromine accounting for 1%-10% of the total weight of the bromine is added in a
reaction system for brominating induction reaction, and then the residual bromine is added. The bromine is added for twice during brominating reaction, firstly the bromine accounting for 1%-10% of the total weight of the bromine is added for initiating the whole
system, the brominating induction reaction guides the direction of the brominating reaction so that monobromides and dibromides generating
ketone due to the repeated resolution of cyclized matter are reduced, and finally the method achieves the purpose of improving the yield of the brominating reaction; and the conversion rate of the bromides is high and can be greater than 97%.