Composto processo para preparar o mesmo composição herbicida e processo para danificar severamente ou exterminar plantas não-desejadas

Compounds of general formula (I), wherein X is O, S or CR R ; each R and R is, independently, hydrogen or C1-C4 alkyl; Z is O, S or NR ; n is 0 or 1; Y is O, S, NR or CR R ; R is H, OH, CHO, NR R or C1-C10 hydrocarbyl, 0-(C1-C10 hydrocarbyl), either of which may be substituted with one orm ore substituents chosen from OR , COR , COOR , OCOR , CN, halogen, S(O)pR , NR R , NO2, NR COR , NR CONR R , CONR R or heterocyclyl; R , R and R are each, independently, hydrogen, C1-C6 hydrocarbyl or C1-C6 halohydrocarbyl; p is 0, 1 or 2; alternatively: when Y is NR or CR R , and: a) Z is NR ; or b) n is 0; the substituents of Y and Z or Y and R may together form a bridge represented by the formula -Q -Q - or -Q -Q -Q -, where Q , Q and Q each independently represent CR R , =CR , CO, NR , =N, O or S; each or R and R independently represents hydrogen, C1-C4 alkyl, OH or halogen; R represents hydrogen or C1-C4 alkyl; W is O or S; R is hydrogen or C1-C10 hydrocarbyl or heterocyclyl having 3 to 8 ring atoms; R and R are each independently hydrogen or C1-C4 alkyl; A is an aromatic or heteroaromatic ring system optionally substituted alternatively, two or more substituents of the group A may combine to form a fused 5- or 6-membered saturated or partially saturated carbocyclic or heterocyclic ring in which any carbon or quaternised nitrogen atom may be substituted with any of the groups mentioned above for A or in which a ring carbon atom may be part of a carbonyl group or a nitrogen atom may be oxidised.