Benzofuranyl-benzimidazoles

A benzofuranyl-benzimidazole of the formula ##STR34## wherein R.sub.1 represents alkoxy of 1 to 12 carbon atoms, alkenyloxy of 3 or 4 carbon atoms, phenoxy or phenylalkoxy containing 1 to 4 carbon atoms in the alkoxy moiety which is unsubstituted or substituted in the phenyl moiety by chlorine, alkyl or alkoxy, each of 1 to 4 carbon atoms, or represents hydroxy-(C.sub.1 -C.sub.4)-alkoxy, (C.sub.1 -C.sub.4)-alkoxy-(C.sub.1 -C.sub.4)-alkoxy, cyano-(C.sub.1 -C.sub.4)-alkoxy, carb-(C.sub.1 -C.sub.4)-alkoxy-(C.sub.1 -C.sub.4)-alkoxy, carbamoyl-(C.sub.1 -C.sub.4)-alkoxy or cyclohexyloxy or represents hydrogen if R.sub.2 and R.sub.3 together form butadienylene, or together with R.sub.2 forms methylenedioxy or ethylenedioxy,

• R.sub.2 represents a hydrogen or halogen atom, alkyl or alkoxy, each of 1 to 4 carbon atoms, or, if R.sub.1 represents hydrogen, together with R.sub.3 forms butadienylene, or together with R.sub.1 forms methylenedioxy or ethylenedioxy,
• R.sub.3 represents a hydrogen atom, alkyl or alkoxy, each of 1 to 4 carbon atoms, or, if R.sub.1 represents hydrogen, together with R.sub.2 forms butadienylene,
• R.sub.4 represents hydrogen, alkyl or alkoxy, each of 1 to 4 carbon atoms, or phenyl,
• R.sub.7 represents alkyl of 1 to 8 carbon atoms, alkenyl of 3 to 4 carbon atoms, cyclohexyl, hydroxyalkyl of 2 to 4 carbon atoms, alkoxyalkyl of altogether 3 to 6 carbon atoms, carboxyalkyl of 2 to 5 carbon atoms, carbalkoxyalkyl of altogether 3 to 9 carbon atoms, cyanoalkyl of 2 to 5 carbon atoms, benzyl which is unsubstituted or substituted by chlorine, methyl or methoxy;
• dialkylaminoalkyl of altogether 3 to 7 carbon atoms or phenethyl, or, if n is 0, also represents hydrogen,
• R.sub.8 represents hydrogen, alkyl or 1 to 6 carbon atoms, hydroxyalkyl of 2 to 4 carbon atoms, cyanoalkyl of 2 to 5 carbon atoms, carboxyalkyl of 2 to 5 carbon atoms, carbamoylalkyl of 2 to 6 carbon atoms, alkoxycarbonylalkyl of altogether 3 to 9 carbon atoms, alkenyl of 3 to 4 carbon atoms, or benzyl which is unsubstituted or substituted by chlorine, methoxy or methyl,
• R.sub.5 represents cyano or trifluoromethyl,
• n is 0 or 1,
• A.sup.w.crclbar. represents a colourless anion and
• w represents the valency of the anion A.