Production Methods
The industrial, step by step synthesis of oxapyrazon-dimolamine is not described in open literature. However, its production can be inferred from the chemistry of pyridazinone herbicides. The active ingredient would be manufactured by first constructing the pyridazinone ring system of the free-acid, typically through condensation of a suitably substituted hydrazine with a brominated diketone or equivalent precursor. This intermediate pyridazinone would then undergo amide formation with oxamic acid or an activated oxamate derivative to introduce the oxamic acid side chain characteristic of oxapyrazon. Once purified, this acidic active ingredient is converted into oxapyrazon dimolamine by forming a 1:1 salt with 2 dimethylaminoethanol.
