PLANT-GROWTH REGULATING ACTIVITIES OF IHYDRO-1-HYDROXY-3-OXO-1-ISOBENZOFURANCARBOXAMIDES

The antigravitropic activity of a series of hydro-1-hydroxy-3-oxo-1-is obenzofurancarboxamides, not yet reported in the literature, was studi ed. Several derivatives of the class were as active as the N-1-naphthy lphthalamic acid (NPA) used as the reference standard in the assay on germinating seeds of Lens esculenta. Activity of the compounds of the class may be due to their 2-(2-arylamino-1,2-dioxoethyl)benzoic tautom eric forms (B-I), which possess all the structural requirements of Phy totropins. Several derivatives were also subjected to a herbicidal ass ay against some common weeds: high herbicidal activity was found in on e derivative.