14 AKT. lö. — T. HAG A : 



Spontaneous Decomposition of 

 Dibenzenesulphohydroxylamine in dilute Alcohol. 



About four grammes of dibenzenesulphohydroxylamine (m.p. 

 132°C.) were dissolved in ninety per cent alcohol and kept in a 

 stoppered bottle for about a month, when the solution became 

 brownish yellow in colour and deposited a very small quantity of 

 a crystalline product, which was insoluble in sodium hydroxide. 

 After purification, it melted constantly at 98 FC. On analysis it 

 was found to contain 20.72 per cent of nitrogen. The substance was, 

 therefore, tribenzenesulphohydroxylamine, which melts at 982°C. 

 and contains 21.22 per cent of nitrogen. The mother liquor, 

 from which these crystals have separated, when neutralised Avith 

 baryta and concentrated, yielded a quantity of thick microscopic 

 prisms almost insoluble in absolute alcohol. Analysis of the 

 purified substance gave 18.85 per cent of barium, 17.21 per cent 

 of sulphur, and 3.80 per cent of nitrogen, showing the substance 

 to be anhydrous barium dibenzenesulphimide. 



The mother liquor, from which barium dibenzenesulphimide 

 has separated, yielded, on further concentration, a quantity of ci-ys- 

 tals, which were found to contain no nitrogen and which agreed 

 in their properties with those of barium benzenesulphonate. On 

 heating at lOO-llO^'C. the substance lost 4.02 per cent in weight. 

 The dehydrated salt, on analysis, gave 30.37 per cent of barium, 

 and 14.68 per cent of sulphur. Anhydrous barium benzene- 

 sulphonate contains 30.43 per cent of barium and 14.20 per cent 

 of sulphur. Ordinary crystals of the salt contain one molecule of 

 water, equal to 3.84 per cent. In an aqueous alcoholic solution, 

 therefore, dibenzenesulphohydroxylamine appears to decompose 



