摘要：The reaction of acetylacetone reagent with hexamine (hexamethylenetetramine) was investigated. Hexamine dissolved in acetylacetone reagent is decomposed rapidly on heating in boiling water bath to liberate HCHO which reacts with the reagent, while the liberation of HCHO from hexamine at 60° is considerably slow. Aqeous solutions of hexamine and HCHO were individually reacted with acetylacetone reagent in boiling water bath for ten minutes and the extinctions at 425 mμ of the reaction mixtures were measured. The calibulation curve of hexamine is identical with that of HCHO. DDL (3, 5-diacetyl-1, 4-dihydrolutidine) produced in the reaction mixture is gradually decomposed on heating in boiling water bath, and then the extinction decreases slowly, but the decrease could be neglected for determining HCHO. Hexamine is obtainable in pure crystalline form, and is sufficiently stable in aqueous solution. Therefore, it is considered that hexamine is a excellent standard substance for determining HCHO by acetylacetone reaction. The results of the present investigation also indicate that hexamine itself can be determined by acetylacetone reaction.
