Herbicidally and insecticidally active 4-phenyl-substituted pyridazinones

1. A 4-phenylpyridazinone of formula (I) or a salt thereof

in which

A is (C 3 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 6 )-alkyl, benzyl, halophenyl-(C 1 -C 6 )-alkyl or is (C 1 -C 6 )-alkyl which is substituted by m halogen atoms;

B is (C 3 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 6 )-alkyl, benzyl, halophenyl-(C 1 -C 6 )-alkyl or is (C 1 -C 6 )-alkyl which is substituted by n halogen atoms;

m is 0, 1, 2 or 3;

n is 0, 1, 2 or 3, with the proviso that m and n are not both 0;

G is hydrogen, C(═O)R 1 , C(=L)MR 2 , SO 2 R 3 , P(=L)R 4 R 5 , C(=L)NR 6 R 7 , or E;

E is Na + , K + , (Mg 2+ ) 1/2 , (Ca 2+ ) 1/2 , R 13 R 14 R 15 R 16 N + or NH 4 + ;

R 13 , R 14 , R 15 and R 16 are independently of one another (C 1 -C 6 )-alkyl or benzyl;

L is oxygen;

M is oxygen;

R 1 is (C 1 -C 6 )-alkyl which is substituted by n halogen atoms or is (C 3 -C 6 )-cycloalkyl, phenyl or phenyl-(C 1 -C 4 )-alkyl, each of which is substituted by n radicals selected from the group consisting of halogen, (C 1 -C 4 )-alkyl and (C 1 -C 4 )-alkoxy;

R 2 is (C 1 -C 6 )-alkyl which is substituted by n halogen atoms or is (C 3 -C 6 )-cycloalkyl, phenyl or benzyl, each of which is substituted by n radicals selected from the group consisting of halogen, (C 1 -C 4 )-alkyl and (C 1 -C 4 )-alkoxy;

R 3 , R 4 and R 5 are each independently of one another (C 1 -C 6 )-alkyl which is substituted by n halogen atoms or are phenyl or benzyl which are substituted by n radicals selected from the group consisting of halogen, (C 1 -C 4 )-alkyl and (C 1 -C 4 )-alkoxy;

R 6 and R 7 are each independently of one another hydrogen, (C 1 -C 6 )-alkyl which is substituted by n halogen atoms or phenyl or benzyl which are substituted by n radicals selected from the group consisting of halogen, (C 1 -C 4 )-alkyl and (C 1 -C 4 )-alkoxy; and

a) X is hydrogen, methyl, ethyl or cyclopropyl;

Y is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl, (C 1 -C 6 )-alkoxy or phenyl which is substituted by n halogen atoms,

Z is hydrogen, halogen, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl or phenyl which is substituted by n halogen atoms,

or

b) X is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 1 -C 6 )-alkoxy or (C 3 -C 6 )-cycloalkyl;

Y is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl, is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms;

Z is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl or is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms.

2. The 4-phenylpyridazinone as claimed in claim 1 in which

A is cyclopropyl, cyclopropylmethyl, benzyl, 2-chlorophenylmethyl, 3-chlorophenylmethyl or 4-chlorophenylmethyl;

B is 2,2-difluoroethyl, 2,2,2-trifluoroethyl, cyclopropyl, cyclopropylmethyl, benzyl, 2-chlorophenylmethyl, 3-chlorophenylmethyl or 4-chlorophenylmethyl;

G is hydrogen, C(═O)R 1 , C(=L)MR 2 , SO 2 R 3 , P(=L)R 4 R 5 , C(=L)NR 6 R 7 , or E;

E is Na + , K + , (Mg 2+ ) 1/2 , (Ca 2+ ) 1/2 , (CH 3 ) 4 N + or NH 4 + ;

L is oxygen;

M is oxygen;

R 1 is (C 1 -C 6 )-alkyl or (C 3 -C 6 )-cycloalkyl;

R 2 is (C 1 -C 6 )-alkyl, (C 3 -C 6 )-cycloalkyl or benzyl;

R 3 , R 4 and R 5 are each independently of one another (C 1 -C 6 )-alkyl, phenyl or benzyl;

R 6 and R 7 are each independently of one another hydrogen, (C 1 -C 6 )-alkyl, phenyl or benzyl; and

a) X is hydrogen, methyl or ethyl;

Y is fluorine, bromine, chlorine, iodine, cyano, nitro, cyclopropyl, methoxy, ethoxy, trifluoromethyl or trifluoromethoxy, phenyl or halophenyl;

Z is hydrogen, fluorine, bromine, chlorine, iodine, methyl, ethyl, methoxy, ethoxy, trifluoromethyl or cyclopropyl;

or

b) X is fluorine, bromine, chlorine, iodine, cyano, nitro, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy or cyclopropyl;

Y is hydrogen, fluorine, bromine, chlorine, iodine, methyl, ethyl, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy or cyclopropyl;

Z is hydrogen, fluorine, bromine, chlorine, iodine, methyl, ethyl, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy, cyclopropyl, chlorophenyl or fluorophenyl.

3. A herbicidal composition which comprises an effective amount of at least one 4-phenylpyridazinone of the formula (I) as claimed in claim 1 .

4. The herbicidal composition as claimed in claim 3 as a mixture with at least one formulation auxiliary.

5. The herbicidal composition as claimed in claim 3 which comprises at least one further pesticidally active compound selected from the group consisting of insecticides, acaricides, herbicides, fungicides, safeners and growth regulators.

6. The herbicidal composition as claimed in claim 5 which comprises a safener.

7. The herbicidal composition as claimed in claim 5 which comprises a further herbicide.

8. A method for controlling unwanted plants comprising applying an effective amount of at least one 4-phenylpyridazinone of the formula (I) as claimed in claim 1 to plants or to a site where an unwanted plant is growing.

9. A 4-phenylpyridazinone of formula (I) as claimed in claim 1 which is capable of controlling unwanted plants.

10. A 4-phenylpyridazinone as claimed in claim 9 which is capable of controlling unwanted plants in crops of useful plants.

11. The 4-phenylpyridazinone as claimed in claim 10 wherein the useful plants are transgenic useful plants.

12. A compound of formula (II),

in which

A is (C 1 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 6 )-alkyl, benzyl, halophenyl-(C 1 -C 6 )-alkyl or is (C 1 -C 6 )-alkyl which is substituted by m halogen atoms;

B is (C 3 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 6 )-alkyl, benzyl, halophenyl-(C 1 -C 6 )-alkyl or is (C 1 -C 6 )-alkyl which is substituted by n halogen atoms;

m is 0, 1, 2 or 3;

n is 0, 1, 2 or 3, with the proviso that m and n are not both 0;

a) X is hydrogen, methyl, ethyl or cyclopropyl;

Y is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl, (C 1 -C 6 )-alkoxy or phenyl which is substituted by n halogen atoms,

Z is hydrogen, halogen, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl or phenyl which is substituted by n halogen atoms,

or

b) X is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 1 -C 6 )-alkoxy or (C 3 -C 6 )-cycloalkyl;

Y is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl, is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms;

Z is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl or is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms;

and R 9 is (C 1 -C 6 )-alkyl.

13. A compound of formula (IIa)

in which

B is (C 3 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 6 )-alkyl, benzyl, halophenyl-(C 1 -C 6 )-alkyl or is (C 1 -C 6 )-alkyl which is substituted by n halogen atoms;

n is 0, 1, 2 or 3; and

a) X is hydrogen, methyl, ethyl or cyclopropyl;

Y is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl, (C 1 -C 6 )-alkoxy or phenyl which is substituted by n halogen atoms,

Z is hydrogen, halogen, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 3 -C 6 )-cycloalkyl or phenyl which is substituted by n halogen atoms,

or

b) X is halogen, cyano, nitro, halo-(C 1 -C 6 )-alkyl, halo-(C 1 -C 6 )-alkoxy, (C 1 -C 6 )-alkoxy or (C 3 -C 6 )-cycloalkyl;

Y is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl, is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms;

Z is hydrogen, halogen, cyano, nitro, (C 3 -C 6 )-cycloalkyl or is (C 1 -C 6 )-alkyl, (C 1 -C 6 )-alkoxy or phenyl, each of which is substituted by n halogen atoms.

14. A 4-phenylpyridazinone of the formula (I) as claimed in claim 1 suitable for use as an insecticide.