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.
本文描述了某些新型
吡啶氧基苯氧基
脂肪酸、
吡啶基
硫氧基
脂肪酸、其衍
生物和相关化合物。更具体地说,这些新型化合物在
吡啶基团的3位上带有
氟取代基,在5位上的取代基选择自
氯、CF.sub.3、CF.sub.2 Cl或CF.sub.2 H。这些新型化合物在控制草本杂草的预出芽和后出芽活性方面表现出惊人的效果。