Novel compounds that exhibit herbicidal action have the general formula: in which:, R = -CO-R7, R9- R2 ,R3 ,R4 ,R5 = H, alkyl, haloalkyl;, R6 = -OR11 , , -O- m-R13 , -NR14 R15, halogen, , -O- q-R17 (where: R11 = H, alkaline or alkaline earth metal; R12 , R13 = alkyl, haloalkyl, phenyl, substituted phenyl, aralkyl, cycloalkyl; m,q = 0,1,2; R14 , R15 = H, alkyl, alkoxyl; R16 =alkyl, alkenyl, aralkyl, phenyl, substituted phenyl; R17 = alkyl, phenyl, substituted phenyl);, R1 = phenyl, substituted phenyl, aralkyl, cycloalkyl, the -OR18 group (where R18 = alkyl, phenyl, substituted phenyl, aralkyl, substituted aralkyl), the , - R25 ,R26 , (like or unlike)are: H, alkyl C1-C6 , alkoxyl C1-C6, phenyl, substituted phenyl; X1 ,X2 (like or unlike) are O, S, SO, SO2); n=0, 1, on condition that when n=1, R1 = phenyl, substituted phenyl, aralkyl, cycloalkyl.