Pyridazinone herbicides

A compound selected from Formula 1, N-oxides and salts thereof,

• wherein
• W is O or S;
• R1 is H, C1-C7 alkyl, C3-C8 alkylcarbonylalkyl, C3-C8 alkoxycarbonylalkyl, C4-C7 alkylcycloalkyl, C3-C7 alkenyl, C3-C7 alkynyl, C3-C7 cycloalkyl, C4-C7 cycloalkylalkyl, C2-C3 cyanoalkyl, C1-C4 nitroalkyl, C2-C7 haloalkoxyalkyl, C1-C7 haloalkyl, C3-C7 haloalkenyl, C2-C7 alkoxyalkyl, C3-C7 alkylthioalkyl, C1-C7 alkoxy or benzyl;
• or a 5-, or 6-membered saturated or partially saturated heterocyclic ring containing ring members selected from carbon and up to 1 O and 1 S;
• R2 is H, halogen, —CN, —CHO, C1-C7 alkyl, C3-C8 alkylcarbonylalkyl, C3-C8 alkoxycarbonylalkyl, C2-C4 alkylcarbonyl, C2-C7 alkylcarbonyloxy, C4-C7 alkylcycloalkyl, C3-C7 alkenyl, C3-C7 alkynyl, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C1-C4 alkylamino, C2-C8 dialkylamino, C3-C7 cycloalkyl, C4-C7 cycloalkylalkyl, C2-C3 cyanoalkyl, C1-C4 nitroalkyl, C2-C7 haloalkoxyalkyl, C1-C7 haloalkyl, C3-C7 haloalkenyl, C2-C7 alkoxyalkyl, C1-C7 alkoxy, C1-C5 alkylthio, C2-C3 alkoxycarbonyl;
• or phenyl optionally substituted by halogen, C1-C4 alkyl or C1-C4 haloalkyl;
• X is O, S or NR5;
• or
• X is —C(R6)═C(R7)—, wherein the carbon atom bonded to R6 is also bonded to the carbon atom bonded to R4, and the carbon atom bonded to R7 is also bonded to the phenyl ring moiety in Formula 1;
• each R3 is independently halogen, —CN, nitro, C1-C5 alkyl, C2-C5 alkenyl, C2-C5 alkynyl, C3-C5 cycloalkyl, C4-C5 cycloalkylalkyl, C1-C5 haloalkyl, C3-C5 haloalkenyl, C3-C5 haloalkynyl, C2-C5 alkoxyalkyl, C1-C5 alkoxy, C1-C5 haloalkoxy, C1-C5 alkylthio, C1-C5 haloalkylthio or C2-C5 alkoxycarbonyl;
• R4, R6 and R7 are independently H, halogen, nitro, —CN, C1-C5 alkyl, C2-C5 alkenyl, C2-C5 alkynyl, C3-C5 cycloalkyl, C4-C5 cycloalkylalkyl, C1-C5 haloalkyl, C3-C5 haloalkenyl, C3-C5 haloalkynyl, C2-C5 alkoxyalkyl, C1-C5 alkoxy, C1-C5 haloalkoxy, C1-C5 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, C1-C5 haloalkylthio or C2-C5 alkoxycarbonyl;
• R5 is H, C1-C3 alkyl or C1-C3 haloalkyl;
• G is G1 or W1G1;
• G1 is H, —C(═O)R8, —C(═S)R8, —CO2R9, —C(═O)SR9, —S(O)2R8, —CONR10R11, —S(O)2NR10R11, or P(═O)(R12)2;
• or C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C1-C4 haloalkyl, C2-C4 haloalkenyl, C2-C4 haloalkynyl, C2-C4 alkoxyalkyl, C3-C6 cycloalkyl or C4-C7 cycloalkylalkyl;
• or a 5- or 6-membered heterocyclic ring;
• W1 is C1-C4 alkanediyl or C2-C4 alkenediyl;
• R8 and R10 are independently C1-C7 alkyl, C3-C7 alkenyl, C3-C7 alkynyl, C3-C7 cycloalkyl, C1-C7 haloalkyl, C3-C7 haloalkenyl, C2-C7 alkoxyalkyl, C4-C7 cycloalkylalkyl;
• or phenyl, benzyl or a 5- to 6-membered heterocyclic ring, each phenyl, benzyl or heterocyclic ring optionally substituted by halogen, C1-C4 alkyl or C1-C4 haloalkyl;
• R9 is C1-C7 alkyl, C3-C7 alkenyl, C3-C7 alkynyl, C3-C7 cycloalkyl, C2-C7 haloalkyl, C3-C7 haloalkenyl, C2-C7 alkoxyalkyl, C4-C7 cycloalkylalkyl;
• or phenyl, benzyl, or 5- to 6-membered heterocyclic ring, each phenyl, benzyl or heterocyclic ring optionally substituted by halogen, C1-C4 alkyl or C1-C4 haloalkyl;
• R11 is H, C1-C7 alkyl, C2-C7 alkenyl, C2-C7 alkynyl, C3-C7 cycloalkyl, C4-C7 cycloalkylalkyl, C1-C7 haloalkyl or C2-C7 alkoxyalkyl;
• R12 is C1-C7 alkyl or C1-C7 alkoxy;
• and
• n is 0, 1, 2, 3 or 4;
• provided that when R4 is H, then X is —C(R6)═C(R7)—.