use:

Two benzene ethers herbicides, for selective before and after bud bud herbicide, used for cereal crops, corn, cotton, peanuts, tomato, rice, soybean field control broadleaf weeds.

Preparation:

3, 4-2 chlorine methyl benzene and three fluorine between hydroxyl benzoic acid reaction, get a 3-(2-chloro-4-(three fluorine methyl) benzene oxygen radicals) benzoic acid, this compounds the nitration get 5-(2-chloro-4-(three fluorine methyl) benzene oxygen radicals)-2-the nitro benzoic acid, finally and alpha chlorinated propionic acid ethyl ester in the presence of potash in dimethyl sulfoxide of reaction, namely the purpose content.