THE IMIDES OF THE AROMATIC SULPHONTC ACIDS. 25 



Sodium dibenzenesulphimide forms bundles of silky needles 

 which are easily soluble in water, but non-deliquescent. 



Ammonium dibenzenesulpldmide forms prisms and sometimes 

 thick tables, which are easily soluble in water and melt at 

 about 240°C. 



Found Caiculated 



Nitrogen 8.93 8.93 



Diorthtoluenesulphohydroxylamine, (CH3C6H4S02)2NOH. 



This substance has as yet received no mention in the literature 

 although the corresponding para-compound has already been 

 described (E. v. Meyer: J. prak. Chem., 1901, 63, 173). With 

 the object of obtaining it orthotoluenesulphinic acid was first 

 prepared by diazotising orthotoluidine and, after a large excess 

 of sulphur dioxide has been added, treating the mixture with 

 finely divided copper (Gattermann: Ber., 1899, 32, 1136). The 

 sulphinic acid thus produced was then converted into the sodium 

 salt, mixed with half its equivalent of sodium nitrite and acidi- 

 fied, when the diorthotoluenesulphohydroxylamine separated out 

 in the crystalline state. 8 grammes of orthotoluidine yielded 93 

 grammes of diorthotoluenesulphohydroxylamine. It was purified 

 by dissolving it in sodium hydroxide, reprecipitating by hydro- 

 chloric acid, and then twice recrystallising it from alcohol. Final- 

 ly, an alcoholic solution of the purified substance was mixed with 

 an excess of water, when it separated out in the form of small 

 prismatic crystals, free from alcohol but containing one molecule 

 of water, and melting at 106— 107 °C. 



