Benzoylisoxazoles and their use as herbicides.

摘要

4-Benzoylisoxazole derivatives of formula (I): <CHEM> wherein: R represents hydrogen or -CO2R<4>; R<1> represents alkyl, haloalkyl or optionally substituted cycloalkyl; R<2> represents halogen, alkyl, haloalkyl or alkyl substituted by -OR<5>, or a group selected from nitro, cyano, -CO2R<4>, -S(O)pR<6>, -O(CH2)rOR<5> and -OR<5>; R<3> represents optionally substituted phenyl; X represents oxygen or -S(O)q-; n represents zero or an integer from one to four; R<4> and R<5> independently represent alkyl or haloalkyl; R<6> represents alkyl, haloalkyl or optionally substituted phenyl; R<7> represents halogen, alkyl or haloalkyl or a group selected from nitro, cyano, -OR<5> and -S(O)pR<6>; p represents 0, 1 or 2; q represents 0, 1 or 2; r represents 1, 2 or 3; the herbicidal properties of these derivatives and their application to crop protection is described.