BENZENE. 267 



aldehyde ; treated with hydriodic acid it yields nitro 

 gen, sulphuric acid, and iodobenzene. 



Diazobenzene hydrobromate, C 6 H 4 N 2 .HBr, is 

 formed by mixing an ethereal solution of diazoamido- 

 benzene with bromine. Colorless very unstable laminae. 



When a watery solution of the nitfate is mixed with 

 a solution of bromine in hydrobromic acid, diazoben- 

 zene perbromide, C 6 H 4 N 2 .HBr.Br 2 , is produced. Large, 

 yellow lamellae, insoluble in water and ether, difficultly 

 soluble in alcohol. Heated either alone or with alco 

 hol it yields monobrombenzene. 



Diazobenzene potassa, C 6 H 4 N 2 .KOH. Is pro 

 duced by the addition of very concentrated potassa-ley 

 to the nitrate ; and can be separated from the saltpetre, 

 that is formed at the same time, by dissolving in alco 

 hol. Colorless laminae of a mother-of-pearl lustre, 

 easily soluble in water and alcohol, insoluble in ether. 

 Detonates when heated. A freshly-prepared aqueous 

 solution gives with silver nitrate a grayish-white, very 

 explosive precipitate of diazobenzene silver-oxide, 

 C 6 H 4 l$r 2 .AgOH. 



Diazo-amidobenzene, C 12 H n Is T3 

 is produced by mixing an aqueous solution of diazo 

 benzene nitrate with anilin ; by conducting nitrous 

 acid into a cooled alcoholic solution of anilin, and by 

 pouring a cooled, slightly alkaline solution of sodium 

 nitrite gradually on anilin hydrochlorate. Golden- 

 yellow, shiny lamellae. Fuses at 91, and detonates 

 when strongly heated. Insoluble in water, easily 

 soluble in ether, benzene, and hot alcohol, less readily 

 in cold alcohol. Nitrous acid, containing nitric acid, 

 converts it into diazobenzene nitrate ; concentrated 

 hydrochloric acid into anilin hydrochlorate, phenol, 

 and nitrogen. 



Biazobenzenimide, C 6 H 5 N 3 , is produced by treat 

 ing diazobenzene-perbromide with aqueous ammonia. 

 Slightly yellow-colored oil, volatile with water 



