COMPOSTO DE ACAO HERBICIDA,COMPOSICAO HERBICIDA,PROCESSO PARA MATAR PLANTAS OU CONTROLAR SEU CRESCIMENTO,E PROCESSO PARA A PREPARACAO DO COMPOSTO HERBICIDA

A herbicidal compound of formula (I) : or N-oxide or quaternised derivative thereof; in which the dotted lines indicate the presence of two double bonds arranged so as to form a fused hetero-aromatic ring system; Ar is an optionally substituted aryl or heterocyclic ring system; W is O or NR where R is H or lower alkyl; A, B, D are independently selected from N, NR , N-E, CR , C-E or C(R )E; wherein E is: provided 2 of A, B and D are N, NR or N-E and at least one of A, B or D carries a group E; where R is H, OR , CN, COOR , alkyl or haloalkyl; R and R are independently selected from H, optionally substituted alkyl, alkenyl or alkynyl, halogen, NR R , or R and R together with the carbon to which they are attached form an optionally substituted alkenyl or cycloalkyl group; R is CO2R , CN, COR , CH2OR , CH(OH)R , CH(OR )R , CSNH2, COSR , CSOR , CONHSO2R , CONR R , CONHNR R , CONHNR R R Y, CO2M or COON=CR R ; X is (CH2)n, CH=CH, CH(OR )CH2 or COCH2; where n is O, 1 or 2; M is an agriculturally acceptable cation; Y is an agriculturally acceptable anion; R is H, halogen, OR , CN, COOR , alkyl or haloalkyl; R and R are independently H or lower alkyl; R , R and R are independently selected from H or an optionally substituted alkyl, alkenyl, alkynyl or aryl group; and R , R , R , R and R are independently selected from H or an optionally substituted alkyl, alkenyl, alkynyl or aryl group or any two of R , R , R , R and R together with the atom to which they are attached form a cycloalkyl or heterocyclic ring providing that the compound is other than 5-(2,4-dichlorophenoxy)indazol-1-ylacetic acid or its methyl ester. Process for the preparation of these compounds and compositions containing them are also described.