| abstract |
The present invention relates to novel pyridazine derivatives of formula (I) or agrochemically useful salt forms thereof, as active ingredients having microbiocidal activity, in particular fungicidal activity.n n n Formula In n n n n n n n In Formula I above,n n n R 1 is hydrogen, C 1 -C 6 alkyl, C 1 -C 8 haloalkyl or C 3 -C 6 cycloalkyl;n n n R 2 is cycloalkyl, cycloalkylalkyl, halocycloalkyl, cycloalkoxy, halocycloalkoxy, cycloalkylalkoxy, halocycloalkylalkoxy, alkoxyalkyl, cycloalkoxyalkoxyalkyl, haloalkoxyalkyl, trialkylsilyl, alkylthioalkyl, Haloalkylthioalkyl, cycloalkylthio, halocycloalkylthio, cycloalkylalkylthio, halocycloalkylalkylthio, alkylsulfinylalkyl, alkylsulfonylalkyl, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkyl Sulfonyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, optionally substituted arylsulfonyl, optionally substituted aryloxy, optionally substituted heteroaryloxy, optionally substituted arylthio or optionally substituted heteroaryl Thio;n n n R 2 together with the adjacent carbon atom form an optionally substituted fused ring;n n n R 3 is optionally substituted aryl;n n n R 4 is hydrogen, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 8 alkoxy, C 1 -C 6 haloalkoxy, hydroxy or cyano;n n n n is an integer of 1-4. |