HERBICIDAL ACTIVITY OF SOME 2-SUBSTITUTED-1,3-(2H,4H)-ISOQUINOLINEDIONES

A series of 2-substituted-1,3-isoquinolinediones C 1-25, precursors of 2-[(arylamino)carbonyl]benzeneacetic acids A and of 2-(2-arylamino-2- oxoethyl)benzoic acids B possessing root antigravitropic activity, wer e prepared and evaluated for herbicidal activity on weeds and crops. A mong the compounds examined; several derivatives were very active agai nst weeds, in many cases more active than the commercially available h erbicides used as the reference standards. Low phytoxicities on crops, selectivity and persistence of herbicidal effect were observed.