The invention relates to a 4-benzoyl
pyrazole compound with herbicidal activity. The
structural formula of the 4-benzoyl
pyrazole compound with the herbicidal activity is as shown in specifications, wherein R1 in the
structural formula is selected from
hydrogen, methyl or ethyl, R2 in the
structural formula is selected from methylsulfonyl, methoxyl, methylthio,
fluorine,
chlorine or cyan, R3 in the structural formula is selected from
hydrogen, methyl, methyl
fluoride, difluoromethyl or
trifluoromethyl, R in the structural formula is selected from a five-membered heteroaromatic ring, a six-membered heteroaromatic ring, C1-C6 alkoxyl, aromatic hetero-oxy, six-membered aryloxy or six-membered aromatic amino, and
hydrogen in the C1-C6 alkoxyl can be replaced by
fluorine or
chlorine; m and n are selected from 0 or 1 and cannot be 1 at the same time. A series of relatively efficient
weed killers and
plant growth regulators with relative good selectivity and safety are synthesized by introducing a
fluorine-containing functional group to a
pyrazole 3-site and chemically modifying a pyrazole 5-site.