3-phenylpropionic acid derivatives of the general formula I ##STR1## where R.sup.1 is hydrogen or halogen, R.sup.2 is halogen, R.sup.3 is unsubstituted or halogen-, C.sub.1 -C.sub.4 -alkoxy- or C.sub.1 -C.sub.4 -alkylthio-substituted C.sub.2 -C.sub.6 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl-substituted C.sub.1 -C.sub.6 -alkyl, further C.sub.5 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.6 -alkenyl or C.sub.3 -C.sub.6 -alkynyl or, together with R.sup.4, a C.sub.2 -C.sub.4 -alkylene chain, R.sup.4 is hydrogen or unsubstituted or halogen-, C.sub.1 -C.sub.4 -alkoxy-, C.sub.1 -C.sub.4 -alkylthio- or C.sub.5 -C.sub.7 -cycloalkyl-substituted C.sub.1 -C.sub.6 -alkyl; C.sub.3 -C.sub.7 -cycloalkyl; unsubstituted or halogen-substituted C.sub.3 -C.sub.6 -alkenyl or C.sub.3 -C.sub.6 -alkynyl or halogen or R.sup.4, together with R.sup.5 and the carbon atom of this substituent, is C.sub.3 -C.sub.6 -cycloalkyl which may be interrupted by an oxygen or a sulfur atom, R.sup.5 is unsubstituted C.sub.1 -C.sub.6 -alkyl or halogen-, C.sub.1 -C.sub.4 -alkoxy- or C.sub. 1 -C.sub.4 -alkylthio-substituted C.sub.2 -C.sub.6 -alkyl; cyano or acyl (COR.sup.6) or alkoxycarbonyl (CO.sub.2 R.sup.7), R.sup.6 denoting C.sub.1 -C.sub.6 -alkyl or, together with R.sup.4, a C.sub.3 -C.sub.5 -alkylene chain and R.sup.7 denoting unsubstituted or halogen-, C.sub.1 -C.sub.4 -alkoxy- or C.sub.1 -C.sub.4 -alkylthio-substituted C.sub.2 -C.sub.6 -alkyl or unsubstituted or C.sub.5 -C.sub.7 -cycloalkyl-substituted C.sub.1 -C.sub.6 -alkyl, further C.sub.5 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.6 -alkenyl or C.sub.3 -C.sub.6 -alkynyl, with the proviso that R.sup.1 and R.sup.4 do not simultaneously denote hydrogen when R.sup.5 is cyano or CO.sub.2 R.sup.7, processes for their manufacture, and their use as herbicides.
一般式I的3-
苯丙酸衍
生物,其中R.sup.1是氢或卤素,R.sup.2是卤素,R.sup.3是未取代的或卤素,C.sub.1-C.sub.4-烷氧基或C.sub.1-C.sub.4-烷基
硫基取代的C.sub.2-C.sub.6-烷基,C.sub.5-C.sub.7-环烷基取代的C.sub.1-C.sub.6-烷基,进一步是C.sub.5-C.sub.7-环烷基,C.sub.3-C.sub.6-烯基或C.sub.3-C.sub.6-炔基或与R.sup.4一起,是C.sub.2-C.sub.4-烷基链,R.sup.4是氢或未取代的或卤素,C.sub.1-C.sub.4-烷氧基,C.sub.1-C.sub.4-烷基
硫基或C.sub.5-C.sub.7-环烷基取代的C.sub.1-C.sub.6-烷基;C.sub.3-C.sub.7-环烷基;未取代或卤素取代的C.sub.3-C.sub.6-烯基或C.sub.3-C.sub.6-炔基或卤素或R.sup.4,与R.sup.5和该取代基的碳原子一起,是C.sub.3-C.sub.6-环烷基,该环烷基可以被氧或
硫原子中断,R.sup.5是未取代的C.sub.1-C.sub.6-烷基或卤素,C.sub.1-C.sub.4-烷氧基或C.sub.2-C.sub.6-烷基
硫基取代的C.sub.2-C.sub.6-烷基;
氰基或酰基(COR.sup.6)或烷氧羰基(CO.sub.2R.sup.7),其中R.sup.6表示C.sub.1-C.sub.6-烷基或与R.sup.4一起,是C.sub.3-C.sub.5-烷基链,而R.sup.7表示未取代或卤素,C.sub.1-C.sub.4-烷氧基或C.sub.1-C.sub.4-烷基
硫基取代的C.sub.2-C.sub.6-烷基或未取代或C.sub.5-C.sub.7-环烷基取代的C.sub.1-C.sub.6-烷基,进一步是C.sub.5-C.sub.7-环烷基,C.sub.3-C.sub.6-烯基或C.sub.3-C.sub.6-炔基,但要注意当R.sup.5为
氰基或CO.sub.2R.sup.7时,R.sup.1和R.sup.4不能同时表示氢,其制造过程以及它们作为
除草剂的用途。