Z ART. Vi. — T. HAGA : 



Königs: Ber., 1878, ii, 615); and aromatic sulpliiiiic acids 

 call now be easily obtained from aromatic amines through their 

 diazo-compounds (Gattermann: Ber., 1899, 32, 1136). It is 

 thus possible to prepare aromatic sulphimides from the corres- 

 ponding amines with a very good yield, and without going through 

 the rather unsatisfactory process of preparing sulphochlorides and 

 then heating these at high temperatures with the alkali derivatives 

 of sulj^hamides. The new method, therefore, not only forms a good 

 alternative process to that ])atented by the firm of Meister, Lucius, 

 UND Brüning, but also offers some considerable advantage over it. 



Reduction of Dibenzenesulphohydroxylamine by 

 Sulphur Dioxide. 



Yield of Dlbenzenesulphimide from Dibenzenesulphohydroxyl- 

 amine : — Sixty and a half grammes of dibenzenesulphohydroxyl- 

 amine were dissolved in three hundred and fifty cubic centime- 

 tres of about ninety one per cent alcohol and treated with a current 

 of sulphur dioxide, until the increase in weight was about forty 

 nine grammes. After leaving the mixture in a well stoppered 

 bottle for five days, the excess of sulphur dioxide was completely 

 removed by passing a long continued current of air through the 

 liquid. A known fraction of the liquid was taken and, after 

 determining its acidity by titration with sodium hydroxide (p. 

 9), it was treated with a solution of mercuric nitrate. From 

 the weight of the mercuric dibenzeuesulphimide obtained, the 

 yield of dlbenzenesulphimide was calculated to be 78.6 per cent 

 of the theoretical amount required by the equation : — 



(0,H,S02),N0H + SO, + HoO = (CnH.SO.O.NH + H,SO, (1). 



Another known fraction of the solution was neutralised with 



