JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY 

 TOTK.O, JAPAN. 



VOL. XVII., ARTICLE 8. 



Preparation of Sulphamide from Ammonium 

 Amidosulphite. 



By 

 Edward Divers, and Masataka Ogawa. 



Sulphamide occurs among the products of the spontaneous 

 decomposition of ammonium amidosulphite. That this appeared 

 to be the case was mentioned in the paper describing this salt 

 (this Journal, 1900, 18, 187). It had then been isolated not 

 only in too small a quantity to admit of its purification and full 

 analysis, but in a way that rendered its identity almost doubtful. 

 The decomposed amidosulphite had been extracted with 95 per 

 cent, alcohol, the residue from the evaporated voluminous solution 

 extracted with undried ether, and the again very voluminous 

 solution evaporated. Half a gram of crystalline residue from 

 about 150 c. c. of the ether solution was thus obtained, answering 

 the tests for sulphamide, but melting much above 81°, tasting 

 not bitter, and yielding a little too much sulphur on analysis. 

 Then, too, we had failed to get silver sulphamide from the aqueous 

 solution of the decomposed amidosulphite, owing, as we afterwards 

 found, to our having used ammonia in excess. All these points 

 differed, or seemed to differ, from Traube 's description, and caused 

 us to hesitate in pronouncing the substance to be sulphamide. 

 Since then, we have obtained it in larger quantity and pure, and 



