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AssigneeCiba-Geigy Corporation
InventorsBeat Bohner, Otto Rohr
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The present invention provides a novel herbicidally active ester, namely the cyanomethyl ester of 4-(p-trifluoromethylphenoxy)-.alpha.-phenoxypropionic acid of the formula ##STR1## 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.
A method of selectively controlling Avena fatua in crops of dicotyledonous cultivated plants, which comprises post-emergence treatment of the Avena fatua-infested crops of cultivated plants with a herbicidally effective amount of the cyanomethyl ester of 4-(p-trifluoromethyl-phenoxy)-.alpha.-phenoxypropionic acid.
Dependencies are inferred from the claim text.