Fungicidal alkylene(cycloalkylene)-bis-heterocyclyl-biguanides

Claim 2

An alkylene(cycloalkylene)-bis-heterocyclyl biguanide of the formula ##STR26## in which A and B each independently is a triazole, tetrazole, pyrazole, imidazole, benzotriazole or benzimidazole radical which is linked via a nitrogen atom and which is optionally substituted by at least one member selected from the group consisting of halogen, nitro, alkyl with 1 to 18 carbon atoms, alkylthio with 1 to 10 carbon atoms, and aryl with 6 to 10 carbon atoms which is optionally mono-, di-, tri-, tetra-, penta- or hexa-substituted by at least one substituent selected from the group consisting of halogen, alkyl with 1 to 4 carbon atoms and halogenoalkyl with 1 to 3 carbon atoms and up to 5 halogen atoms, R is an optionally C 1-6 -alkyl-substituted cycloalkylene radical with 5 to 9 carbon atoms, or a C 1-20 -alkylene radical which is optionally substituted by C 5-7 -cycloalkylene, C 6-12 -bicycloalkylene, C 9-18 -tricycloalkylene, oxygen, sulphur or the NR 3 group, R 1 and R 2 each independently is hydrogen, C 1-20 -alkyl or aralkyl which has 6 to 10 carbon atoms in the aryl part and 1 to 6 carbon atoms in the alkyl part and is optionally substituted by C 1-6 -alkyl or halogen, and R 3 is hydrogen, C 1-6 -alkyl or optionally substituted aralkyl which has 6 to 10 carbon atoms in the aryl part and 1 to 6 carbon atoms in the alkyl part and is optionally substituted by C 1-6 -alkyl or halogen, or a salt thereof.

Claim 3

An alkylene(cycloalkylene)-bis-heterocyclyl-biguanide or salt according to claim 1, in which A and B are identical, and each is a triazole, tetrazole, pyrazole or imidazole radical which is optionally substituted by halogen, nitro, alkyl with 1 to 9 carbon atoms or alkylthio with 1 to 4 carbon atoms or phenyl, or a benzotriazole or benzimidazole radical, the fused-on benzene ring being optionally substituted by halogen, nitro, alkyl with 1 to 4 carbon atoms, alkylthio with 1 to 4 carbon atoms or phenyl optionally substituted by methyl, ethyl, propyl, fluorine, chlorine, trifluoromethyl or difluorochloromethyl, R is cycloalkylene with 5 to 7 carbon atoms in the ring, the rings optionally being substituted by alkyl with 1 to 4 carbon atoms, alkylene with 1 to 12 carbon atoms, or alkylene which has 1 to 4 carbon atoms per alkylene radical and is substituted by cycloalkylene, bicycloalkylene or tricycloalkylene radicals with 5 to 12 carbon atoms in the ring system or alkylene radicals with 1 to 6 carbon atoms which are interrupted by oxygen atoms, sulphur atoms or the NR 3 group, R 1 and R 2 each independently is hydrogen, alkyl with 1 to 10 carbon atoms or aralkyl, the aryl radical optionally being substituted by alkyl with 1 to 4 carbon atoms or halogen, and R 3 is hydrogen, alkyl with 1 to 4 carbon atoms or aralkyl, the aryl radical optionally being substituted by alkyl with 1 to 4 carbon atoms, fluorine, chlorine, bromine or iodine.

Claim 4

A compound according to claim 1, wherein such compound is hexamethylene-bis-triazol-1-yl-biguanide of the formula ##STR27## or a salt thereof.

Claim 5

A compound according to claim 1, wherein such compound is hexamethylene-bis-imidazol-1-yl-biguanide of the formula ##STR28## or a salt thereof.

Claim 6

A compound according to claim 1, wherein such compound is hexamethylene-bis-2-methyl-4-nitroimidazol-1-yl-biguanide of the formula ##STR29## or a salt thereof.

Claim 7

A fungicidal composition comprising a fungicidally effective amount of a compound or salt according to claim 1 in admixture with a diluent.

Claim 8

A method of combating fungi which comprises applying to said fungi or to a fungus habitat a fungicidally effective amount of a compound or salt according to claim 1.

Claim 9

The method according to claim 7, wherein such compound is hexamethylene-bis-triazol-1-yl-biguanide, hexamethylene-bis-imidazol-1-yl-biguanide or hexamethylene-bis-2-methyl-4-nitroimidazol-1-yl-biguanide, or a salt thereof.