JOURNAL OF THE COLLEQE OF SCIENCE, IMPERTAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXI,, ARTICLE 6. 



Hydroxylamine-^,^-Disulphonates (Structural 



Isomerides of Hydro ximinosulphates or 



Hy droxylamine-, ^, ^-Disulphonates) . 



By 



Tamemasa Haga, Rigakuhahishi. 

 Professor of Cliemistry, Imperial University, Tokyo. 



Tn :i previous paper (this Journ. 19, Art. lö), it was shown 

 tliat Freray's inetasulphazilate, which till then had been considered 

 to be constituted as an amine oxide, O : N(S0nK)3, is in reality a 

 hydroxylaminelrisulphonate. The nature of the products of the 

 proximate hydrolysis of the metasulphazilates seems to afford 

 the strongest additional evidence that thes3 salts are hydroxyl- 

 aminesul2:)honates and, as such, mixed anhydrides of an acid- 

 sulphate and a hydroxylaminedisulphonate. 



The ultimate hydrolysis of a hydroxylaminetrisulphonate, 

 through intermediate stages, into hydroxylamine and an acid sul- 

 phate, is difficult to carry to completion (this Journ. 19, Art. lô, 

 28), but the first stage of it, into a hydroxylaminedisulphonate 

 and one-third of the quantity of acid-sulphate that is produced in 

 the ultimate hydrolysis, is very easily accomplished. The hydroxyl- 

 aminedisulphonate thus obtained proves to be an entirely new salt, 

 structurally isomeric with the corresponding hydroxylaminedisul' 

 phonnte (Fremy's sulphazotate) , from which it differs greatly in 



