| abstract |
The invention provides herbicidally-active 2,3-dihydro-5-ncyano-benzofurans of the formula: n n(wherein: R¹ and R² together represent =O or R¹ represents nhydrogen and R² represents hydrogen, hydroxy, alkoxy, nacyloxy, alkoxycarbonyloxy, alkylthiocarbonyloxy, halogen, nisothiocyanato, amino, alkylamino, dialkylamino, arylamino, nacylamino, alkoxycarbonylamino, alkylthiocarbonylamino, nN-bonded heterocyclyl, cyano or alkylthio; R³ and R⁴ together nrepresent alkylene or each represent hydrogen or alkyl; and nR⁵, R⁶ and R⁷, which may be the same or different, each nrepresent hydrogen, halogen, alkyl, alkoxy, acyl or cyano), nprocesses for their preparation and herbicidal compositions ncontaining them. |