14 AET. 14. — T. SUZUKI : THE OXTMES AND 



p-Benzenedisulphimide crystallises in colourless prisms, with 

 two molecules of water, which can be driven off at 100°. This 

 imide behaves much like the corresponding meta-compound and 

 can be precipitated from its aqueous solution by strong acids. 

 The alkaline salts of the imide are sparingly soluble in water, 

 even hot water not taking up much of them. Under the micro- 

 scope they present the appearance of rhombic plates. Silver and 

 mercurous salts form white, heavy, crystalline precipitates. The 

 free imide has a sour taste, not accompanied, however, by any 

 bitterness like that of the meta-compound. The small quantity 

 of pure p-benzenedisulphochloride at my disporal made any further 

 examination of these salts impossible. 



Analytical data. 

 p-Benzenedisulphimide. 



a) Water of crystallisation. 



0.1220 gr., on drying at 100°-10.5°, lost 0.0092 gr. 



Water found 7SAo/o 



Calculated for HN I " i NH, G Ik.O 7.60,, 



\S0. . C,H, . SOj 



Ij) kSulphur. 



0.1128 gr. of the anhydrous imide gave 0.2440 gr. of barium snlpliate. 



Sulphur found 29.729^ 



calculated 29.2.0,, 



c) Nitrogen. 



0.18G1 gr. of the anhydrous imide gave 9.9 c.c. of moist nitrogen at 

 13° and 7G7 m.m. 



Nitrogen found G.^Oo/, 



,, calculated G.40 „ 



