Fungicidal 2-cyanobenzimidazole derivatives, compositions, and method of use

A 2-cyanobenzimidazole derivative of the general formula:

• ##STR23## in which n represents an integer equal to 0, 1, 2 or 3;
• R represents a halogen atom or a lower alkyl radical optionally substituted by one or more halogen atoms;
• a lower alkoxy radical optionally substituted by one or more halogen atoms or by the phenyl radical;
• a lower alkylthio radical optionally substituted by one or more halogen atoms;
• a lower alkenyl radical;
• a lower alkynyl radical;
• an amino radical optionally substituted by one or two identical or different lower alkyl radicals;
• a nitro radical;
• a cyano radical;
• a cyanato radical;
• a thiocyanato radical;
• an isothiocyanato radical;
• a lower alkylsulphonyl radical;
• a sulphamoyl radical optionally substituted by one or two identical or different lower alkyl radicals;
• a lower alkylsulphinyl radical;
• a lower alkanoyl radical optionally halogen substituted or a benzoyl radical optionally halogen substituted;
• or an alkoxycarbonyl radical containing from 2 to 5 carbon atoms, it being understood that if n is greater than or equal to 2, the substituents R can be either identical or different;
• and
• R' represents a lower alkyl or cycloalkyl radical optionally substituted by one or more halogen atoms;
• an amino radical optionally substituted by one or two identical or different lower alkyl radicals which are themselves optionally substituted;
• or a morpholino radical, or pyrrolidino radical, it being understood that, in the above, the adjective "lower" applied to an organic radical means that this radical contains at most 6 carbon atoms.