The present invention relates to novel active alkynyl-substituted n-phenyl-pyrrolidine-2,4-diones according to formula (I), or to agrochemically acceptable salts thereof, where X = C1-C4 alkyl, C1-C4 haloalkyl, or C3-C6 cycloalkyl, Y = C1-C4 alkyl, or C3-C6 cycloalkyl, R1 = hydrogen, C1-C6 alkyl, or C3-C6 cycloalkyl, R2 = hydrogen or methyl, R3 = C1-C6 alkyl, or C1-C6-alkoxy-C2-C6 alkyl, G = hydrogen, a splittable group L, or a cation E. The invention also relates to a herbicidal composition comprising a compound of general formula (I) and to the use of the compounds according to the invention for controlling weeds and weed grasses in commercial crop cultivation.
