The compounds are herbicides. Herbicidal compositions containing as active ingredient a compound of formula I, a process for severely damaging or killing unwanted plants by applying to the plants or to the growth medium of the plants an effective amount of a compound of formula I, processes for the preparation of compounds of formula I and intermediates useful in the preparation of compounds of formula I are described.
Prepared are compounds of formula I
or a salt thereof wherein:

A, B, D, E, T, U and V are independently chosen from the group consisting of hydrogen, halogen, nitro, cyano, thiocyano, possibly halogenated alkyl, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, possibly alkylated amino, sulfo, sulfamoyl, carboxy, carbamoyl, C 2 to C 6 alkenyl, C 3 to C 7 cyclo-alkyl, possibly substituted phenyl, phenoxy, phenylthio groups, and wherein at least one of A, B, D, E and T is not hydrogen, the alkyl groups containing 1 to 6 carbon atoms,
R' is chosen from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, alkoxyalkyl, haloalkyl, alkanoyl, all containing at most 10 carbon atoms, or possibly substituted phenyl, benzyl, benzoyl,
R 2 is chosen from the group consisting of hydrogen, alkyl, alkenyl, alkoxyalkyl, haloalkyl, all containing at most 6 carbon atoms, and acetyl, propionyl, and C 2 to C 6 alkoxy-carbonyl, R 3 is chosen from the group consisting of hydrogen, alkyl, alkenyl, alkoxyalkyl, all containing at most 6 carbon atoms, and C 1 to C 4 haloalkyl, or R 2 and R 3 together may form a C 1 to C 3 alkylidene group,
W is chosen from the group consisting of cyano, thiocar- bamoyl, -C-G and CH 2 Z wherein:
G is chosen from the group consisting of hydroxy, mercapto, possibly substituted C 1 to C 10 alkoxy, and C 2 to C 10 alkenyloxy, C 2 to C 10 alkynyloxy, C 1 to C 10 alkylthio, C 2 to C 10 alkenylthio, C 2 to C 10 alkynylthio, possibly substituted C 3 to C 7 cycloalkoxy, possibly substituted phenoxy, phenylthio, benzyloxy, benzylthio, the group OM wherein M is the cation of an inorganic or organic base, the group-NNSO 2 R 4 wherein R 4 is chosen from C 4 to C 10 , alkyl and C, to C 10 haloalkyl, and the group -NR 5 R 6 wherein R 5 and R 6 are independently chosen from the group consisting of hydrogen, C 1 to C 6 alkyl, phenyl and benzyl or R 5 and R 6 together form a heterocyclic ring and
Z is chosen from the group consisting of halogen, hydroxy, mercapto, possibly substituted C 1 to C 10 alkoxy, possibly substituted C 1 to C 10 alkylthio, formyl, and the group NR 5 R 6 wherein R 5 and R 6 are as hereinbefore defined:
X is chosen from oxygen and sulfur and
n is 0, 1 or 2.