There are described novel 2-[4-(5-chloro-3-fluoropyridin-2-yloxy)-phenoxy]-propionic acids esters and -thio-esters having a herbicidal action and an action reducing the growth of grasses, which compounds correspond to the formula I ##STR1## wherein Q is oxygen or sulfur, R.sub.1 is hydrogen or methyl R.sub.2 is hydrogen or C.sub.1 -C.sub.4 alkyl The salts and enantiomers of these compounds are also part of the invention. These compounds are suitable for selectively controlling weeds in crops of cultivated plants, and for reducing the growth of grasses.
本文描述了一种具有除草作用和减缓草本植物生长作用的新型2-[4-(5-
氯-3-
氟吡啶-2-氧基)-苯氧基]-
丙酸酯和
硫酯,这些化合物对应于公式I
其中,Q为氧或
硫,R1为氢或甲基,R2为氢或C1-C4烷基。这些化合物的盐和对映异构体也是本发明的一部分。这些化合物适用于选择性地控制作物中的杂草,并减缓草本植物的生长。