New alkynyl-substituted 3-phenylpyrrolidine-2,4-diones and use thereof asherbicidesThe present invention relates to novel effective alkynyl-substituted3-phenylpyrrolidine-2,4-diones according to the general formula (I) oragrochemicallyacceptable salts thereof,(see formula I)whereX = 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 ormethyl,R3 = C1-C6-alkyl or C1-C6-alkoxy-C2-C6-alkyl, G = hydrogen, a cleavable groupL or acation E, where R3 is not equal to methyl if R1 = methyl and R3 is not equalto C1-C3-alkyl if R1 = H.The invention also relates to a herbicidal composition comprising a compoundof thegeneral formula (I) and to the use of the compounds according to the inventionforcontrolling weeds and weed grasses in crops of useful plants.
