Certain novel pyridinyloxyphenoxy alkanoic acids, pyridinylthiophenoxy alkanoic acids, derivatives thereof and related compounds are described. More specifically, these novel compounds bear a fluorine substituent in the 3-position of the pyridinyl group and in the 5-position the substituent is selected from chlorine, CF.sub.3, CF.sub.2 Cl or CF.sub.2 H. These novel compounds exhibit surprising preemergent and postemergent activity in the control of grassy weeds.
描述了一些新颖的
吡啶氧基苯氧
丙酸、
吡啶基
硫氧基
丙酸、其衍
生物和相关化合物。更具体地说,这些新颖化合物在
吡啶基的3-位置带有
氟取代基,在5-位置的取代基可选择为
氯、CF.sub.3、CF.sub.2 Cl或CF.sub.2 H。这些新颖化合物在控制草本杂草方面表现出令人惊讶的前期和后期活性。