New alkynyl substitution 3-phenylpyrrolidine- 2，4-dione and its use as a herbicide

The invention relates to new effective alkynyl-substituted 3-phenylpyrrolidine-2，4-diones of general formula (I) or agrochemically acceptable salts thereof， wherein X = C 1-C4 alkyl， C1-C4 haloalkyl， or C3-C6 cycloalkyl; Y = C1-C4 alkyl or C3-C6 cycloalkyl; n = 1， 2， or 3; m = 1 or 2; R1 = C1-C6 alkyl or C3-C6 cycloalkyl; R2 = hydrogen or methyl; R3 = C1-C3-alkoxy-C1-C3-alkyl or a saturated five- or six-membered heterocycle having an oxygen or sulfur atom; G = hydrogen， a group L that can be cleaved off， or a cation E. The invention further relates to the use of the compounds according to the invention to control weeds and undesired grasses in cultures of useful plants. The invention relates to new effective alkynyl-substituted 3-phenylpyrrolidine-2，4-diones of general formula (I) or agrochemically acceptable salts thereof， wherein X = C1-C4 alkyl， C1-C4 haloalkyl， or C3-C6 cycloalkyl; Y = C1-C4 alkyl or C3-C6 cycloalkyl; n = 1， 2， or 3; m = 1 or 2; R1 = C1-C6 alkyl or C3-C6 cycloalkyl; R2 = hydrogen or methyl; R3 = C1-C3-alkoxy-C1-C3-alkyl or a saturated five- or six-membered heterocycle having an oxygen or sulfur atom; G = hydrogen， a group L that can be cleaved off， or a cation E. The invention further relates to the use of the compounds according to the invention to control weeds and undesired grasses in cultures of useful plants.