Herbicidal activity of 2-substituted 1,3,4-(2H)-isoquinolinetriones

A series of 2-substituted 1,3,4-isoquinolinetriones (B) 1-15, precursors of the phthalamic acids and of the 1,3-dihydro-1-hydroxy-3-oxo-1-isobenzofura ncarboxamides (F), possessing root antigravitropic activities, were prepare d and evaluated for herbicidal activity on weeds and crops. Among the compo unds examined, several derivatives were very active against weeds, in many cases more active than the commercially available herbicides used as the re ference standards. Phytotoxicities on crops, selectivity and persistence of herbicidal effect were observed. (C) 1999 Elsevier Science S.A. All rights reserved.