Herbicidal sulfonamides

A compound of the formula:

• ##STR121## wherein R.sub.1 is H, alkyl of one to three carbon atoms or --OCH.sub.3 ;
• R.sub.2 is H or alkyl of one to three carbon atoms;
• R.sub.3 is ##STR122## R.sub.7 is hydrogen, fluorine, chlorine, bromine, alkyl of 1-4 carbon atoms, alkoxy of 1-4 carbon atoms, nitro, CF.sub.3, CH.sub.3 S or CH.sub.3 CH.sub.2 S;
• R.sub.4 is R.sub.9 S(O).sub.n ;
• R.sub.5, R.sub.6 and R.sub.8 are independently hydrogen, fluorine, chlorine, bromine, methyl or methoxy;
• R.sub.9 is C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.4 alkenyl, cyclopentyl or cyclopropylmethyl;
• X is CH.sub.3, --CH.sub.2 CH.sub.3, alkoxy of one to three carbons, CF.sub.3, CH.sub.3 S--, CH.sub.3 OCH.sub.2 -- or CH.sub.3 OCH.sub.2 CH.sub.2 O--;
• Y is CH.sub.3 or OCH.sub.3 ;
• Z is N;
• and
• n is 0, 1 or 2;
• and their agriculturally suitable salts;
• provided that:
• (a) R.sub.1 and R.sub.2 may not simultaneously be hydrogen;
• (b) when R.sub.6 is other than H, then R.sub.5, R.sub.7 and R.sub.8 must be hydrogen;
• (c) when n is 1, then R.sub.7 is other than CH.sub.3 S or CH.sub.3 CH.sub.2 S, and X is other than CH.sub.3 S;
• (d) when R.sub.6 is H and R.sub.5, R.sub.7 and R.sub.8 are other than H, then R.sub.5, R.sub.7 and R.sub.8 must either be Cl or CH.sub.3 ;
• and
• (e) when R.sub.9 is C.sub.1 -C.sub.2 alkyl, then n is 1 or 2.