Herbicidal compounds

A compound of formula (I)

• wherein
• X is selected from S and O;
• A is:
• Rb is selected from unsubstituted C1-C6 alkyl or substituted C1-C6 alkyl substituted with one or more groups independently selected from hydroxyl, halogen, cyano and C1-C6alkoxy;
• Rc is selected from hydrogen, halogen, cyano, C1-C6 alkyl and C1-C6haloalkyl;
• R1 is selected from hydrogen, C1-C6 alkyl optionally substituted with NR10R11, C1-C3 haloalkyl, C1-C6 alkoxy and C2-C6 alkynyl;
• wherein R10 and R11 are independently selected from hydrogen, C1-C6 alkyl and C1-C6 haloalkyl;
• R2 is selected from hydrogen, hydroxyl, halogen, C1-C6 alkyl, C2-C6alkenyl, C2-C6 alkynyl, C1-C6 alkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy, C1-C6 alkoxy C1-C6 alkyl, and the group NR12R13 wherein R12 and R13 are independently selected from hydrogen and C1-C6;
• or R1 and R2 together with the nitrogen and carbon atoms to which they are attached form a 3-5 membered saturated or partially unsaturated ring optionally comprising from 1 to 3 heteroatoms independently selected from S, O and N and optionally substituted with from 1 to 3 groups independently selected from hydroxyl, ═O, C1-C6 alkyl and C1-C6 haloalkyl;
• R3 is selected from halogen, hydroxyl, —NR5R6, or any one of the following groups
• R5 and R6 are, independently, selected from hydrogen, C1-C20 alkyl, C1-C20 haloalkyl, C2-C20 alkenyl and C2-C20 alkynyl, or R5 and R6 together with the carbon atoms to which they are attached form a 3-6 membered saturated or partially unsaturated ring optionally comprising from 1 to 3 heteroatoms independently selected from S, O and N and optionally substituted with from 1 to 3 groups independently selected from halogen and C1-C6 alkyl;
• R7 and R8 are independently selected from hydrogen, C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 alkynyl, a C5-C10 heteroaryl group which can be mono- or bicyclic comprising from 1 to 4 heteroatoms independently selected from N, O and S and optionally substituted with 1 to 3 groups independently selected from halogen, C1-C3 alkyl, C1-C3 haloalkyl and C1-C3 alkoxy, a C6-C10 aryl group optionally substituted with 1 to 3 groups independently selected from halogen, nitro, cyano, C1-C3 alkyl, C1-C3 alkoxy, C1-C3 haloalkyl and C1-C3haloalkoxy, or R7 and R9 together with the atoms to which they are attached form a 3-6 membered saturated or partially unsaturated ring optionally comprising from 1 to 3 heteroatoms independently selected from S, O and N and optionally substituted with from 1 to 3 groups independently selected from halogen or C1-C6 alkyl;
• R9 is selected from C1-C6 alkyl or benzyl optionally substituted with 1 to 3 groups independently selected from halogen, nitro, cyano, C1-C3alkyl, C1-C3 alkoxy, C1-C3 haloalkyl and C1-C3 haloalkoxy;
• or an N-oxide or salt form thereof;
• with the provisos that
• (i) when R1 is methyl, A is
• Rb is C1-C6 cyanoalkyl or C1-C6 haloalkyl then R2 is not C1-C4 alkoxy or C1-C4 alkoxy-C1-C4-alkyl;
• (ii) when R1 is C1-C3 alkyl, R2 is hydrogen, hydroxyl, methyl or allyl, Rb is not substituted C1-C6 alkyl substituted by halogen or C1-C6 alkoxy;
• (iii) when R1 is C1-C3 alkyl, R2 is H, A is
• then Rb is not substituted C1-C6 alkyl substituted by halogen;
• (iv) Rb can only be unsubstituted C1-C6 alkyl when R1 or R2 is C2-C6 alkynyl, or one of R1 or R2 is C2 or C3 alkyl and the other is not H, or R1 and R2 together form a 3-5 membered ring structure;
• and
• (v) when R1 is hydrogen, methyl, R1 is hydrogen, and Rc is hydrogen, chlorine or bromine, Rb is not substituted alkyl substituted by halogen.