Reactions of Amidosulfuric Acid Salts with Formaldehyde

Potassium amidosulfate reacts with formaldehyde at pH 7-12 to afford a mixture of dipotassium 4-hydroxy-1,3-diazabutane-1,3-disulfonate hydrate and tripotassium 6-hydroxy-1,3,5-triazahexane-1,3,5-trisulfonate HO(CH2NSO3K) n ·H2O (n = 2, 3). The reaction of the same compounds at pH 1-3 gives diammonium 1,3,5,7-tetraazabicyclo[3.3.1]nonane-3,7-disulfonic acid sulfate dihydrate.