Eglinazine was manufactured through a straightforward heterocycle-assembly route typical of early triazinone herbicides. Commercial processes began with readily available chloro-substituted aromatic intermediates, which were then reacted with hydrazine- or amine-based building blocks to construct the triazinone core through condensation and ring closure steps. Subsequent halogenation and substitution reactions introduced the herbicidally active substituents, followed by purification to technical-grade material.