2-alkynyl-6-pyridin-2-yl-pyridazinones, 2-alkynyl-6-pyridin-2-yl-dihydropyridazinones, 2-alkynyl-6-pyrimidin-2-yl-pyridazinones and 2-alkynyl-6-pyrimidin-2-yl-dihydropyridazinones and their use as fungicides
This invention relates to certain novel 2-alkynyl-6-pyridin-2-yl-pyridazinones, 2-alkynyl-6-pyridin-2-yl-dihydropyridazinones, 2-alkynyl-6-pyrimidin-2-yl-pyridazinones and 2-alkynyl-6-pyrimidin-2-yl-dihydropyridazinones such as those illustrated in Formula I and to the use of these compounds for control of fungal pathogens of plants and mammals.
1. A compound of the formula
wherein
A represents N or CR 6 ;
represents one of a single and a double bond;
R 1 , R 2 , R 3 and R 6 independently represent H, halogen, nitro, cyano, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkyl, C 1 -C 6 haloalkoxy, C 1 -C 6 haloalkylthio, unsubstituted or substituted phenyl, or unsubstituted or substituted phenoxy;
R 4 represents H, halogen, cyano or C 1 -C 6 alkyl; and
R 5 represents halogen, C 1 -C 8 alkyl, C 2 -C 8 alkenyl, C 2 -C 8 alkynyl, C 1 -C 8 alkoxy, C 1 -C 8 haloalkyl, C 2 -C 8 haloalkenyl, C 2 -C 8 haloalkynyl or C 1 -C 8 haloalkoxy
with the proviso that when A represents N, then at least one of R 1 , R 2 , and R 3 represents halogen or C 1 -C 8 haloalkyl, and when A represents CR 6 , then at least one of R 1 , R 2 , R 3 and R 6 represents halogen or C 1 -C 8 haloalkyl.
2. A fugicidal composition comprising a fungicidally effective amount of a compound of claim 1 , in a mixture with an agriculturally acceptable adjuvant or carrier.