| abstract |
Triketone derivatives represented by general formula (I), wherein Y1 represents C¿1-4?alkyl, halogeno or C1-4haloalkyl; Y?2 and Y3¿ independently represent each C¿1-4?alkyl; Y?4¿ represents hydrogen, C¿1-4?alkyl or halogeno; n is an integer of 0, 1 or 2; p is 0 or 1; R?1, R2, R3 and R4¿ independently represent each hydrogen, C¿1-4?alkyl or phenyl, or when p is 1, then R?1 or R4¿ binds to R3 or R4 to thereby form a double bond in the molecule; and X represents oxygen or a group of formula (A), wherein R?5 and R6¿ independenlty represent each hydrogen, C¿1-4?alkyl or phenyl: by which upland weeds over a broad range can be controlled in a low dosage without causing any chemical injury on crops such as corn. |