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.
式(I)的除草化合物##STR1##或其盐、互变异构体或环状衍
生物;其中R.sup.1和R.sup.2为氢,A为三个碳原子的饱和或不饱和链或环,可以取代。还描述和声明了制备这些化合物的方法、制备中间体和含有它们的
除草剂组合物。