A racemic or (d) form of compounds of the formula ##STR1## wherein X is alkyl optionally substituted by halogen, alkylsulfonyl, or halogen; R is an alkyl group and R.sup.1 is an esterifying organic acid function, is useful as an herbicide.
式子为##STR1##的化合物的外消旋或(d)形式,在其中X是烷基,可选地被卤素,烷基磺酰基或卤素取代; R是烷基,而R.sup.1是酯化有机酸功能,可用作
除草剂。