The invention relates to isoxazole derivatives of formula (I): ##STR1## wherein: Ar represents phenyl optionally substituted by from one to three groups and wherein two substituents on adjacent positions of the phenyl ring, together with the two atoms to which they are attached, form a 5- to 7-membered ring which is optionally substituted; R represents the hydrogen atom or a group --CO.sub.2 R.sup.3 ; R.sup.1 represents alkyl, haloalkyl or optionally substituted cycloalkyl; R.sup.3 represents alkyl, alkenyl or alkynyl containing up to six carbon atoms which is optionally substituted by one or more halogen atoms; and their use as herbicides.
该发明涉及以下式(I)的异氧唑衍
生物:##STR1##其中:Ar代表苯基,可以选择地被一个到三个基取代,其中苯环上相邻位置的两个取代基与它们连接的两个原子共同形成一个5-至7-成员环,该环可以选择地被取代;R代表氢原子或一个基--CO.sub.2 R.sup.3;R.sup.1代表烷基,卤代烷基或选择性被取代的环烷基;R.sup.3代表含有最多六个碳原子的烷基,烯基或炔基,可以选择地被一个或多个卤原子取代;以及它们作为
除草剂的用途。