Imidodisulphamide, NH2.SO2.NH.SO2.NH2, is the first product of the action of ammonium carbamate on pyrosulphuryl chloride. It is also obtained when sulphamide is heated nearly to its melting-point. Imidodisulphamide forms needle-shaped colourless crystals, melting at 160° C., and having a distinctly acid taste, since water causes rapid decomposition into sulphamide and amidosulphonic acid:
NH(SO2.NH2)2 + H2O = SO2(NH2)2 + NH2.SO2OH. |