1864] 



in which Nitrogen is substituied for Hydrogen. 



379 



N 1 . . 



Dia^obenzolimide, €g -g- \ N, is obtained according to the equation 



C, H,N,HBr3 + 4NH3=€, H, Ng + SNH.Br. 



Dibromide. Ammonia. Diazoben- Bromide of 

 zolimide. ammonium. 



It forms a yellowish oil, which must be distilled in vacuo with the aid of 

 a current of steam. Exposed by itself to a higher temperature, it decom- 

 poses with detonation. It is remarkable for its stupefying ammoniacal- 

 aromatic odour. 



H N 1 



Ethyldiazohenzolimide, q^^ \ is analogous in its properties, and 

 is formed in a similar manner. 



Products of Deco?nj}ositio7i of Biazobenzol Compounds. 



The transformations which the molecule of diazobenzol undergoes under 

 the influence of various reagents are numerous. The products often re- 

 present some peculiar classes of entirely new compounds ; more frequently, 

 however, they belong to the phenyl- and benzol-group. I will describe a 

 few of them somewhat more fully. 



It has already been mentioned that, on boiling with water, nitrate of 

 diazobenzol is broken up into nitrogen, phenylic acid, and nitric acid. 

 Hydrobromate of diazobenzol undergoes an analogous decomposition, viz., 

 HBr + H, O = N, + H, O + HBr . 



Treated with alcohol, nitrate of diazobenzol is decomposed in the fol- 

 lowing manner : — 



2 (€, H, N„ NHO3) + H, = €3 + (N0,),0 + €, H,0 + N, + H,0. 



Nitrate of diazo- Alcohol. Benzol. Diuitrophenylic Aldehyde, 

 benzol. acid. 



On dissolving sulphate of diazobenzol in a small quantity of concentrated 



sulphuric acid, it gives rise to the formation of a new sulpho-acid which I 



propose to call disulphophenylenic acid. 



Sulphate of diazo- Disulphophenylic 

 benzol. acid. 



The excess of sulphuric acid may be removed from the new acid by 



means of carbonate of barium. The new barium- salt crystallizes in 



beautiful prisms. Its composition must be expressed by the formula 



€g H^^S^ Ba, O^. The free acid obtained by the addition of sulphuric 



acid to the barium-salt is deposited in warty masses of radiating crystals 



which deliquesce in the air. Disulphophenylenic acid is four-basic, and is 



capable of forming four series of salts. The silver-salt forms, however, an 



exception, its composition being expressed by the formula €g Ag^ O^. 



Disulphophenylenic acid, hke phosphoric acid, appears to be capable of 



existing in different modifications, possessing different powers of basicity. 



