Compounds of formula (I), wherein W is a group (W1), (W2) or (W3); R 11is hydrogen, fluorine, chlorine, bromine or methyl; R12 is hydrogen, halogen, methyl, halomethyl, nitro, amino, hydroxy, OHC-, HOC(O) -, cyano, C1-C4alkoxycarbonyl or halomethoxy; X1is O, S, R20N= or R25ON=; R13is hydroxy, C1-C 6alkoxy, C3- C6alkenyloxy, C3-C6alkynyloxy, C 1-C6haloalkoxy, C3-C6haloalkenyloxy, C1-C 6alkoxy-C1-C6alkyl, C3-C6alkenyloxy-C1- C6alkyl, C3-C6 alkynyloxy-C1-C6alkyl, C1-C6alkoxy-C1- C6alkoxy-C1-C6 alkyl, B1-C1-C 6 alkoxy, R21(R22)N, C1- C6alkyl, C3- C6 alkenyl, C3-C 6alkynyl, C2-C6haloalkyl, C3- C6haloalkenyl, C 3-C6cycloalkyl, C3-C6halocycloalkyl, B1-C 1-C6alkyl, OHC-, C1-C6alkylcarbonyl, C1-C 6alkylcarbonyloxy, C1-C6 haloalkylcarbonyl, C2-C6 alkenylcarbonyl, C1-C6 alkoxycarbonyl, C1-C6alkyl- S(O) 2-, C1-C6 haloalkyl-S(O)2-, (C1-C6alkyl) 2N-N=CH-, (a), (b), B1-CH=N-, (CH3)2N- CH=N-, (C1- C5hydroxyalkyl)-CH2-, (B1-C1-C5hydroxyalkyl)-CH2-, (B 1-C1-C5haloalkyl)-CH2-, (hydroxy-C1-C5 alkyl)-O- or (B1-C1-C5hydroxyalkyl)-O-; or X1and R13together are a group =N-Y- wherein Y is bonded to the ring nitrogen atom; and R20, R21, R22, R25, B1 and y are as defined in claim 1, and the pyrazole N-oxides, agrochemically acceptable salts and stereoisomers of those compounds of formula (I), have good selective herbicidal properties pre- and post- emergence. The preparation of those compounds and the use thereof as herbicidal active ingredients are described.
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