N-substituted-3-(substited hydrazino)-benzenesulfonamide derivatives, prepation process thereof, and herbicidal compositions

The present invention is to provide a novel N-substituted-3-(substituted hydrazino)benzenesulfonamide derivative, and a herbicidal composition containing a herbicidally effective amount of the derivative. The N-substituted-3-(substituted hydrazino)benzenesulfonamide derivative is represented by the formula (I): wherein R 1 is C 1 -C 4 alkyl, monochloromethyl, C 3 -C 4 alkenyl, C 1 -C 4 alkoxymethyl, C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkylthioethyl, pyridyl, thienyl, thenyl, tetrahydrofurfuryl, morpholino or phenyl which is unsubstituted or substituted with chlorine or C 1 -C 4 alkyl; R 2 is hydrogen or C 1 -C 4 alkyl; R 3 is C 1 -C 4 alkyl; X 1 is C 1 -C 3 alkyl, C 1 -C 3 alkoxy, or chlorine; X 2 is C 1 -C 3 alkyl or C 1 -C 3 alkoxy; and Z is N or CH.