FIELD: chemistry.SUBSTANCE: invention relates to a pyrazolyl pyrazole derivative of formula (I), where Rrepresents a halogen atom, Rrepresents a cyano group, a nitro group or a halogen atom, Rrepresents a hydrogen atom, a trifluoroacetyl group or a pentafluoropropionyl group, R-Rmay be the same or different and represent hydrogen atoms, halogen atoms, C-Calkyl groups that may be substituted with one or more halogen atoms, depending on the case, C-Ccycloalkyl groups which may be substituted with one or more halogen atoms depending on the case, or C-Calkenyl groups, which may be substituted with one or more halogen atoms, depending on the case, a is 3–5, and b is 0–2..EFFECT: claimed compound can effectively control major weeds having higher leaf ages which become a practical problem.7 cl, 4 tbl, 7 ex
