174 



Proceedings of the Royal Irish Academy. 



"but dissolves Tvith. facility in alcoh.ol or glacial acetic acid. It melts- 

 ■wdth partial decomposition at 120° - 121° C. Analysis gave the fol- 

 lowing numbers : — 



Found. 



Calculated for. 

 CsHnBrsKO 

 ^ 26-79 

 2-73 

 59-05 



It is evidently derived from the amide by the substitution of three- 

 atoms of bromine for three atoms of hydrogen. Its constitution is 

 most probably 



c 



= 26-65 



H 



= 2-95 



Br 



= 59-36 



]sr 



= — 



BrC = a 



BrC = U 

 Br. 



"Wlien the clear liquid from which this body has been filtered off 

 is evaporated on the "water-bath, much hydrobromic acid escapes, 

 and a crystalline body is deposited. This must be removed before the 

 liquid has gone quite to dryness, and it is then easily purified by 

 crystallization from water or alcohol. The new body forms small 

 hard transparent crystals which melt with decomposition at 197° C. 

 It dissolves easily in all alkalis, and is reprecipitated by dilute acids. 

 Its ammoniacal solution, when evaporated to dryness on the water- 

 bath, leaves a residue which is not dissolved by water, and which 

 appears to be the original body, still, however, containing a little 

 ammonia. This is not the behaviour of a true acid. Boiling with 

 fixed alkalis decomposes it completely, ethylamine, alkaline bromide, 

 and other bodies not as yet investigated, being formed. Analysis 

 leads to the formula CoHuBroXoOs. 



Found. 



Calciilated 



C = 30-08 



30-42 



H = 3-31 



3-09 



Br = 44-87 



45-07 



N = 7-8 



7-88 



= — 



— 



This compound is also obtained when the tribrominated diethyl- 

 carbopyrrolamide is treated with bromine water. The reaction is per- 

 haps the following : — 



CgHuBrsNoO + Bra + 2H2O = CgHnBr.^^Os + 4HBr. 



It is not, however, easy to frame a constitutional formula for it 

 which shall be in harmony with such a change, unless we suppose 



