| abstract |
X is O or S; nn is 0 or 1; nR is H, Cl, F, Br, CH₃, OCH₃ or OCH₂CH₃; nR is C₁-C₃ alkyl, allyl or propargyl; nR₂ is X₁R₈ or OH; nR₃ is Cl, F, Br or CF₃; nR₄ is H, Cl, F or Br; nR₅ is CF₃; nR₆ is H or Cl; nR₇ is H, Cl, F, Br or CF₃; nR₈ is an organic group of defined structure; nX₁ is O or S; nand their agriculturally suitable salts, exhibit herbicidal activity, especially for the control of weeds in rice. |