A herbicidal compound of formula (I) ##STR1## or a salt, tautomer or cyclic derivative thereof; where R.sup.1 and R.sup.2 are hydrogen and A is an optionally substituted saturated or unsaturated chain or ring of three carbon atoms. Methods for preparing these compounds, intermediates used in the preparation and herbicidal compositions containing them are also described and claimed.
化学式(I)的除草化合物##STR1##或其盐、互变异构体或环衍
生物;其中R.sup.1和R.sup.2是氢,A是一个由三个碳原子组成的饱和或不饱和链或环,其中链或环可以选择性地被取代。还描述和声明了制备这些化合物的方法、制备中使用的中间体以及含有它们的
除草剂组合物。