As new compounds are provided 2-(4',6'-di-substituted pyrimidine-2'-yl)oxy- or thio-benzoic acid derivatives of the formula ##STR1## wherein R is hydrogen, hydroxy, alkoxy, alkenyloxy, alkylthio or other substituents, R.sup.1 and R.sup.2 are each a halo, alkyl, alkoxy or other substituents; and X is oxygen or sulfur atom. These new compounds are useful as herbicidal agent effective to inhibit the growth of annual weeds and also perennial weeds predominant in irrigated fields of aquatic rice plants and in plowed fields.
新化合物提供了公式##STR1##中的2-(4',6'-二取代
嘧啶-2'-基)氧基或
硫基
苯甲酸衍
生物,其中R为氢、羟基、烷氧基、烯氧基、烷
硫基或其他取代基,R.sup.1和R.sup.2分别为卤素、烷基、烷氧基或其他取代基;X为氧或
硫原子。这些新化合物可用作
除草剂,能有效抑制一年生杂草和多年生杂草在灌溉
水稻田和犁地中的生长。