Plant growth regulating compounds

A compound of formula (I)

• wherein
• Each W is independently O or S;
• A1 is C—R1;
• A2 and A4 are each independently C—R1 or nitrogen, wherein each R1 may be the same or different and wherein at least one of A2 and A4 is nitrogen.
• A3 is C—X;
• R1 is H, cyano, halogen, C1-C6alkoxy, C1-C6alkyl or C1-C6alkyl substituted by one or more halogen, hydroxyl, amine;
• X is halogen, C1-C6haloalkyl, cyano, thiocyanate, nitro, C1-C6alkoxy, C1-C6haloalkoxy, C1-C6alkylthio, C1-C6haloalkylthio, C1-C6alkylsulfinyl, C1-C6haloalkylsulfinyl, C1-C6alkylsulfonyl, C1-C6haloalkylsulfonyl, C2-C6alkenyl, C2-C6alkynyl, amine, N—C1-C6alkyl amine, N,N-di-C1-C6alkyl amine, C1-C6alkylcarbonyl, C1-C6alkoxycarbonyl, C1-C6haloalkoxycarbonyl, C1-C6haloalkylcarbonyl, C3-C8cycloalkyl, formyl or mercapto;
• or X is heteroaryl or heteroaryl substituted by one or more halogen, cyano, C1-C3alkyl, C1-C3haloalky;
• R2 is H, C1-C6alkyl, C1-C6haloalkyl, C1-C6alkylcarbonyl, C1-C6alkoxycarbonyl;
• or R2 is C1-C6alkyl substituted by one or more cyano, amine, carbonylamine;
• R3, R4, R5 and R6 and are independently hydrogen, halogen, nitro, cyano, C1-C3alkyl, C1-C3haloalkyl, C1-C3 alkoxy, hydroxyl, —OC(O)R9, amine, N—C1-C3alkyl amine or N,N-di-C1-C3alkyl amine;
• R7 is hydrogen, C1-C6alkyl, C1-C6haloalkyl, C2-C6alkenyl, C2-C6haloalkenyl, C2-C6alkynyl, C2-C6haloalkynyl, C3-C7cycloalkyl, benzyl or benzyl substituted by substituents R10, aryl or aryl substituted by one to five substituents R10, heteroaryl or heteroaryl substituted by one to five substituents R10, heterocyclyl or heterocyclyl substituted by one to five substituents R10;
• or R7 is C1-C6alkyl substituted by one or more cyano, nitro, amine, hydroxyl, C1-C6alkoxy, C1-C6haloalkoxy, C1-C6alkylthio, C1-C6haloalkylthio, C1-C6alkylsulfinyl, C1-C6haloalkylsulfinyl, C1-C6alkylsulfonyl, C1-C6haloalkyl-sulfonyl, C3-C7cycloalkyl, N—C1-C6alkyl amine, N,N-di-C1-C6alkyl amine, benzyl or benzyl substituted by substituents R10, aryl or aryl substituted by one to five substituents R10, heteroaryl or heteroaryl substituted by one to five substituents R10, heterocyclyl or heterocyclyl substituted by one to five substituents R10;
• each R10 is independently cyano, nitro, amino, hydroxy, halogen, C1-C6alkyl, C1-C6haloalkyl, C1-C4alkoxy-C1-C4alkyl, C2-C6alkenyl, C2-C6haloalkenyl, C2-C6alkynyl, C2-C6haloalkynyl, C3-C6cycloalkyl, C3-C6halocycloalkyl, C1-C6alkoxy, C1-C6haloalkoxy, C1-C4alkoxy-C1-C4alkoxy, C1-C6alkylthio, C1-C6haloalkylthio, C1-C6alkylsulfinyl, C1-C6haloalkylsulfinyl, C1-C6alkylsulfonyl, C1-C6haloalkylsulfonyl, N—C1-C6alkylamino, N,N-di-(C1-C6alkyl)amino, N,N-di-(C1-C6alkyl)aminocarbonyl, N,N-di-(C1-C6alkyl)aminosulfonyl, C1-C6alkyl-carbonyl, C1-C6alkylcarbonyloxy, C1-C6alkoxycarbonyl, C1-C6alkyl-carbonylamino;
• and
• R9 is hydrogen, C1-C6alkyl, C1-C6alkoxy, or C1-C6haloalkyl;
• or salts or N-oxides thereof.