Herbicides

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C - Chemistry, Metallurgy

07

D

C07D 471/04 (2006.01) A01N 43/90 (2006.01)

Patent

CA 2086898

ABSTRACT Pyrido[2,3-d]pyridazin-5-one and pyrido[2,3-d]pyridazin-5-thione derivatives of general formula (I): Image (I) wherein R and R1 independently represent hydrogen, optionally halogenated alkyl, alkenyl or alkynyl, optionally substituted heterocycle or a group -[CR41R42]n-(phenyl)-(R3)q; R2 represents halogen, optionally halogenated alkyl, alkenyl or alkynyl, CN; -CO2R4;-S(O)rR4;-NO2;-NR41R42;-OH;-COR4,-S(O)rR5,-CO2R5,-OR5; -CONR41R42,-OSO2R5,-OSO2R6,-OCH2R5,-N(R41)COR6,-N(R41)SOR5, -N(R41)SO2R6,-S2NR41R42,optionally substituted phenyl, alkoxy or haloalkoxy; X represents oxygen or sulphur; R3 represents halogen, optionally halogenated alkyl, alkenyl, alkoxy, alkynyl, -OH,-S(O)rR4,-CO2R4,COR4,-CN,-NO2,-NR41R42,-OR5;-CONR41R42, -OSO2R5,-OSO2R6,-OCH2R5,-N(R41)COR6,-NR41)SO2R5,N(R41)SO2R6 or -SO2NR41R42; R4 represents a hydrogen atom or optionally halogenated Cl 6 alkyl; R41 and R42, which may be the same or different, each represents a hydrogen atom or optionally halogenated C1-4alkyl; R5 represents a phenyl group optionally substituted by from one to five groups selected from halogen, nitro, cyano, R4 and -OR4; m represents zero or an integer from one tn three; n represents zero, one or two; where n is two, the groups -(CR41R42)- may be the same or different, q represents zero or an integer from one to five; r represents zero, one or two; with the proviso that when m represents zero R and R1 do not simultaneously represent hydrogen; and agriculturally acceptable salts thereof are useful as herbicides.

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