999 EDWARD DIVERS AND TAMEMASA HAGA; 



nitrite; and, from this acid by reducing it with sodium amalgam, sodium 

 amidosulphonate is obtained (Berglund, 1876). Berglund's work was 

 admittedly incomplete ; he did not isolate the acid and he did not 

 state the condition for success. Oxyamidosulphonic acid is not 

 attacked by sodium amalgam, except in acid solution ; that it is then 

 changed into amidosulphonic acid, we have proved by getting crystals 

 of this acid. In place af sodium, zinc and sulphuric acid, as also the 

 Gladstone-Tribe copper-zinc couple, may be used with perfect success. 

 Another, but indirect, way of effecting the conversion is given lower 

 down (10). 



7. Potassium nitrososulphate, which is prepared from potassium 

 sulphite and nitric oxide, and is not a sulphonate, also yields amido- 

 sulphonic acid among the products of its reduction by sodium 

 amalgam. (See the paper, later on in this volume, entitled The reduction 

 of nitrososu Ip li a tes) . 



8. Simplest and most direct of all modes of formation of 

 amidosulphonic acid is the sulphonation of hydroxylamine, which may 

 be effected by allowing sulphur dioxide to act long enough upon a 

 solution of one of its salts (Raschig, 1887). 



9. Acetoxime also yields amidosulphonic acid by treatment with 

 aqueous sulphur dioxide (M. Schmidt, 1891). Sodium metasulphite 

 acts upon it to form a hydrolysable compound (v. Pechmann, 1887), 

 which is dimethyl methyleneimidosulphonic acid (a monosulphonic 

 acid, therefore, an amidosulphonic not imidosulphonic derivative) ; 

 and it is this which by hydrolysis yields acetone again and amido- 

 sulphonic acid (Krafff, Bourgeois, and Danibinann, 1892). 



10. The reduction of oxyamidosulphonic acid by sodium 

 and by zinc has already been treated of ((J), but this acid can 

 also be converted by sulphur dioxide into imidosulphonic acid, from 

 which amidosulphonic acid results by hydrolysis. That this would be 



