THE IMIDES OF THE AROMATIC SÜLPHONIC ACID3. 29 



mes of diparatolueiiesulplioliydroxylamhie, corresponding to 92 per 

 cent of the theoretical yield. 



Seven grammes of the crude diparatoluenesulphohydroxyl- 

 amine were suspended in about a hundred cubic centimetres of 

 alcohol and treated with a current of sulphur dioxide, keeping 

 the mixture cool by means of water. The whole substance soon 

 went into solution, but the current of sulphur dioxide was conti- 

 nued, until tlie solution was nearly saturated with it. The whole 

 was then left in a well-stoppered bottle over night. On expelling 

 the sulphur dioxide and evaporating the solution, about five gram- 

 mes of diparatoluenesulphimide was obtained in the crystalline 

 state and this was purified by repeated crystallisation from hot 

 water. It melted at 168-170°C. Analysis of the substance 

 yielded the following results : — 



Fuuiul Calc. for CiJIj^O^NS., 



Sulphur 19.47 19.40 19.71 



Nitrogen 4.40 4.43 4.31 



Tile molecular weigiit of this substance was determined by the 

 ebuUioscopic method, using ether as the solvent. 



Substance taken, 0.3752 grammes ; volume of the solution 

 25.5 c.c; elevation of the boiling point, 0.15°C.; hence the 

 molecular weight, 301. 



Volume of the solution, 2G.0 c.c; elevation of the boiling 

 point, 0.13 c; hence the molecular weight, 334. 



Volume of the solution, 26.5 c.c; elevation of the boiling 

 point 0.15 c.; hence the molecular weight, 284. 



Found Calculated 



Molecular weight 306.0 (mean) 325.3 



The method of preparing sulphimides described in this paper 



