Process for the purification of substituted 4-amino-1,2,4-triazine-5-ones

摘要

Substituted 4-amino-1,2,4-triazine-5-ones are purified to remove unwanted N-isomers by maintaining the crude product at a temperature of from about 55 DEG C. to about 70 DEG C. in the presence of a hydroxide, preferably an alkali metal hydroxide for at least 0.5 hour.