3-cyclopropyl-4-(3-amino-2-methylbenzoyl)pyrazoles and their use as herbicides

A compound of the formula (I) or salt thereof

• in which
• R1 and R2 independently of one another are hydrogen, furan-2-yl, tetrahydrofuran-2-yl-methyl,
• or (C1-C4)-alkyl, (C3-C4)-alkenyl, (C3-C4)-alkynyl, (C3-C6)-cycloalkyl, (C3-C6)-cycloalkenyl, (C3-C6)-cycloalkyl-(C1-C4)-alkyl or (C3-C6)-cycloalkenyl-(C1-C4)-alkyl substituted by m radicals from the group consisting of fluorine, chlorine, bromine, cyano, hydroxyl, (C1-C4)-alkyl, (C1-C4)-alkoxy and (C1-C4)-alkoxy-(C1-C4)-alkoxy, where R1 and R2 are not simultaneously hydrogen,
• or
• NR1R2 is a 4- to 7-membered saturated, partially saturated, fully unsaturated or aromatic ring comprising as ring atoms n heteroatoms from the group consisting of nitrogen, oxygen and sulfur which ring is substituted by m radicals from the group consisting of fluorine, chlorine, bromine, iodine, cyano, hydroxyl, trifluoromethyl, nitro, (C1-C4)-alkyl, (C1-C4)-alkoxy, fluoro-(C1-C3)-alkyl, fluoro-(C1-C3)-alkoxy or (C1-C3)-alkoxymethyl;
• R3 is methyl, ethyl or isopropyl;
• R4 is (C1-C4)-alkyl, (C3-C4)-alkenyl or (C3-C4)-alkynyl;
• R5 is hydrogen, (C1-C4)-alkylsulfonyl, (C3-C4)-alkenylsulfonyl, (C3-C4)-alkynylsulfonyl,
• or phenylsulfonyl or benzyl substituted by m radicals from the group consisting of fluorine, chlorine, bromine, cyano, trifluoromethyl, nitro, methyl, ethyl, methoxy and ethoxy,
• m is 0, 1, 2 or 3;
• n is 1, 2 or 3.