4-Benzoylisoxazole derivatives of formula (I): ##STR1## wherein: R represents hydrogen or --CO.sub.2 R.sup.4 ; R.sup.1 represents alkyl, haloalkyl or optionally substituted cycloalkyl; R.sup.2 represents halogen, alkyl, haloalkyl or alkyl substituted by --OR.sup.5, or a group selected from nitro, cyano, --CO.sub.2 R.sup.4, --S(O).sub.p R.sup.6, --O(CH.sub.2).sub.r OR.sup.5 and --OR.sup.5 ; R.sup.3 represents optionally substituted phenyl; X represents oxygen or --S(O)--.sub.q ; n represents zero or an integer from one to four; R.sup.4 and R.sup.5 independently represent alkyl or haloalkyl; R.sup.6 represents alkyl, haloalkyl or optionally substituted phenyl; R.sup.7 represents halogen, alkyl or haloalkyl or a group selected from nitro, cyano, --OR.sup.5 and --S(O).sub.p R.sup.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 are described.
式(I)的4-苯甲酰
异噁唑衍
生物:其中:R代表氢或--CO.sub.2 R.sup.4;R.sup.1代表烷基,卤代烷基或可选择取代的环烷基;R.sup.2代表卤素,烷基,卤代烷基或被--OR.sup.5取代的烷基,或从硝基,
氰基,--CO.sub.2 R.sup.4,--S(O).sub.p R.sup.6,--O(CH.sub.2).sub.r OR.sup.5和--OR.sup.5中选择的基团;R.sup.3代表可选择取代的苯基;X代表氧或--S(O)--.sub.q;n代表零或从一到四的整数;R.sup.4和R.sup.5独立地代表烷基或卤代烷基;R.sup.6代表烷基,卤代烷基或可选择取代的苯基;R.sup.7代表卤素,烷基或卤代烷基或从硝基,
氰基,--OR.sup.5和--S(O).sub.p R.sup.6中选择的基团;p代表0,1或2;q代表0,1或2;r代表1,2或3;描述了这些衍
生物的除草性能以及它们在作物保护中的应用。