| 摘要 |
4-Benzoyl-5-hydroxypyrazole of formula I [R1 = H, alkyl; R2 = alkyl; X = halogen; Y = alkyl; m = 1-5; n = 0-2 were prepd. by reaction of a pyrazol of formula II [R1 = H, alkyl; R2 = alkyl! and a benzene compd of fourmula III [X = halogen; Y = alkyl; m = 1-5; n = 0-2! in the presence aluminum halide at 0 100≦̸C, followed by hydrolysis at 0 - 150≦̸C. The title compds are used as herbicides.
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