AbstractA factorially designed set of 3‐substituted 2‐aryl‐4,5,6,7‐tetrahydroindazoles was synthesized and their herbicidal properties were evaluated using regression analysis. For optimal activity, the substituent at position 3 should be neither strongly hydrophobic nor hydrophilic and should have a small minimum radius. A study of the mechanism of action indicated that the tetrahydroindazoles are inhibitors of the enzyme protoporphyrinogen
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