4-Benzoyl isoxazoles and their use as herbicides.

摘要

The invention relates to 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, alkyl substituted by one or more groups -OR<5>; or a group selected from nitro, cyano, -CO2R<5>, -S(O)pR<6>, -O(CH2)mOR<5>, -COR<5>, -OR<5> and -N(R<8>)SO2R<7>; R<3> represents -SO2R<7>; X represents the oxygen atom; n represents zero or an integer from one to four; R<4> represents alkyl or haloalkyl; R<5> and R<6>, independently represent alkyl, haloalkyl or optionally substituted phenyl; R<7> represents alkyl, haloalkyl, optionally substituted phenyl or -NR<5>R<6>; R<8> represents hydrogen, optionally halogenated alkyl, alkenyl or alkynyl; cycloalkyl, optionally substituted phenyl, -SO2R<6> or -OR<5>; p represents zero, one or two; and m represents an integer from one to three; and their use as herbicides is described.