170 Proceedings of the Royal Irish Academy. 



Condensation-products of Ethyl-pyrrol. 



In my former paper I mentioned that ethyl-pyrrol may be boiled 

 for some time "with strong hydrochloric acid without experiencing any 

 change, in this respect differing from pyrrol. If the boiling is con- 

 tinued for a sufficiently long time, this is not the case. Even when 

 dilute acid is used, the base gradually dissolves, forming a deep-red so- 

 lution which is not rendered turbid by the addition of water. This 

 solution contains the hydrochlorate of a new base, or perhaps salts of 

 several new bases. The product is obtained by precipitating the acid 

 solution with ammonia in excess. On drying the precipitate in vacuo, 

 or at a gentle heat, it is obtained as an amorphous powder, which is 

 nearly insoluble in water, but is readily taken up by alcohol or ether. 

 Its colour varies from pale brown to black, accordingly as it has been 

 prepared with dilute or with strong acid. Heated on the water bath 

 it constantly loses weight, giving off a peculiar odour. Analyses 

 showed it to be of uncertain composition, the following being the mean 

 results : — 



C = 68-64, H = 8-81, :N' = 9-63. 



This composition agrees most closely with the formula Ci6H24]Sr202, 

 which requires — 



C = 69-56, H=8-69, In^=10-1. 



Such a body might be formed according to the following equation : — 



Ethylamine. 



and, in fact, when potash has been used as a precipitant, it is easy to 

 detect abundance of ethylamine in the filtrate. The powder melts at 

 165°-l70°C., but not sharply. It is soluble in all acids (except nitric 

 acid) even when dilute. On evaporating the solution in hydrochlorit- 

 acid on the water-bath, the hydrochlorate remains in the form of blood- 

 red scales, showing no trace of crystalline form. These re-dissolvt' 

 easily in water. The base is precipitated from its acid solutions by 

 minute quantities of nitric acid or nitrates, as a flocculent brown 

 powder. Bromine or chlorine water, stannic and mercuric salts, like- 

 wise precipitate it. In its characters and composition it approaches 

 some of the amorphous alkaloids extracted from cinchona bark. 



Pyrrol-red (which, however, is entirely destitute of basic properties) 

 is produced from pyiTol in a perfectly similar way, 



SCiHs^" + HoO = CV2H14XO + Js^Ho. 



Carhoxyl derivatives of Pyrrol. 



In my former paper I mentioned that when the primary amine 

 salts of mucic acid are distilled, there are produced, besides substituted 

 pyrrols, a series of bodies having the composition of amides of mono- 



