Plant growth regulants and herbicides of the formula ##STR1## in which R.sup.1 represents hydrogen or alkyl, R.sup.2 represents cyano or nitro, R.sup.3 and R.sup.4 independently of one another each represent hydrogen, alkyl, alkoxyalkyl, alkylthioalkyl or halogenoalkyl or represent optionally substituted aryl, or R.sup.3 and R.sup.4 together represent a divalent alkylene radical, R.sup.5 represents hydrogen or alkyl and Ar represents optionally substituted phenyl, or represented optionally substituted pyridyl.
该公式代表的
植物生长调节剂和
除草剂为##STR1##其中R.sup.1代表氢或烷基,R.sup.2代表
氰基或硝基,R.sup.3和R.sup.4分别独立地代表氢、烷基、烷氧基烷基、烷
硫基烷基或卤代烷基,或者代表可选择取代的芳基,或者R.sup.3和R.sup.4一起代表二价的烷基烃基,R.sup.5代表氢或烷基,Ar代表可选择取代的苯基,或者代表可选择取代的
吡啶基。