4-Methylpridazin-3-one compounds of the formula: ##STR1## [wherein, X represents a hydrogen or fluorine atom, and Y represents a hydrogen atom, C.sub.1 -C.sub.6 alkoxy, C.sub.3 -C.sub.6 alkoxy or C.sub.3 -C.sub.6 alkyloxy group] are produced by reacting 4-cyanopyridazin-3-one compounds of the formula: ##STR2## with a methylating agent. Therefore, the above 4-cyanopyridazin-3-one compounds are useful for producing the above herbicidal 4-methylpyridazin-3-one compounds as intermediates.
4-甲基
吡嗪-3-酮化合物的
化学式为:##STR1## [其中,X代表氢原子或
氟原子,Y代表氢原子,C.sub.1-C.sub.6烷氧基,C.sub.3-C.sub.6烷氧基或C.sub.3-C.sub.6烷氧基],通过与甲基化试剂反应制备4-
氰基
吡嗪-3-酮化合物的
化学式为:##STR2## 因此,上述4-
氰基
吡嗪-3-酮化合物可用于作为中间体制备上述
除草剂性的4-甲基
吡嗪-3-酮化合物。