CYANOMETHYL ESTER OF 4-(PARATRIFLUORMETHYLPHENOXY)-ALPHA-PHENOXYPROPIONIC ACID; PROCESS FOR ITS PREPARATION; COMPOSITION CONTAINING THIS HERBICIDAL COMPOUND, AND ITS APPLICATION

摘要

The present invention provides a novel herbicidally active ester, namely the cyanomethyl ester of 4-(p-trifluoromethylphenoxy)- alpha -phenoxypropionic acid of the formula It is a further object of the invention to provide a herbicidal composition which contains this novel ester as active component and also a post-emergence method of selectively controlling monocotyledonous weeds in crops of dicotyledonous plants. The invention furthermore provides a process for the manufacture of the novel ester by methods which are known per se by reaction of a corresponding trifluoromethyl-phenoxy- alpha -phenoxypropionic acid halide with hydroxyacetonitrile (cyanomethanol) or by reaction of 4-(p-trifluoromethylphenoxy)-phenol with a alpha -halopropionic acid cyanomethyl ester.