反应详情

The herbicidal 1,2-dimethyl-3,5-diphenylpyrazolium methyl sulfate may be prepared by condensing 1,3-diphenyl-1,3-propanedione with methylhydrazine to form 2-methyl-3,5-diphenylpyrazole, which is then methylated with dimethyl sulfate as described in U.S. Pat. No. 3,882,142, and illustrated in Flow Diagram I below: