4-Methylpyridazin-3-one compounds of the formula :
[wherein, X represents a hydrogen or fluorine atom, and Y represents a hydrogen atom, a C1-C6 alkoxy, C3-C6 alkenyloxy or C3-C6 alkynyloxy group] are produced by reacting 4-cyanopyridazin-3-one compounds of the formula :
with a methylating agent. Therefore, the above 4-cyanopyridazin-3-one compounds are useful as intermediates for producing the above herbicidal 4-methylpyridazin-3-one compounds.
式中的
4-甲基哒嗪-3-酮化合物:
[式中,X 代表氢原子或
氟原子,Y 代表氢原子、C1-C6 烷氧基、C3-C6 烯氧基或 C3-C6 烷炔氧基]的
4-氰基哒嗪-3-酮化合物与甲基化剂反应制得:
的
4-氰基哒嗪-3-酮化合物与甲基化剂反应而制得。因此,上述
4-氰基哒嗪-3-酮化合物可作为生产上述
除草剂 4-甲基哒嗪-3-酮化合物的中间体。