Bell — Further Observations on Pyrrol and its Derivatives. 175 



that it contains one atom of hydrogen more than is indicated hy ana- 

 lysis, and give to it some such structure as the following : — 



CONHrCoHs) 

 1 CONHCC^Hs) 



/\ I 



H C— a or (HO)C = a 



BrC— C^ ErC - Qi 



\/Br \/Br 







either of which would require 3*37 per cent, of hydrogen.^ This view 

 is quite justified by the analysis of the corresponding methyl-com- 

 pound given below. The second formula would have the advantage 

 of accounting for the property of the compound of dissolving in alka- 

 line solutions. As I have pointed out, the ammonia compound is 

 decomposed by simple heating on the water-bath, which would seem 

 to point to the presence of a hydroxyl group. It is unlikely that any 

 oxidizing action has been exerted upon either of the lateral groups, 

 C2II5 ; for, firstly, the compound readily evolves ethylamine when 

 heated with caustic potash, and secondly, tetrabrominated ethyl-pyrrol 

 is scarcely attacked even when heated with bromine water. 



Prom dimethylcarhopyrrolamide similar bodies may be obtained by 

 shaking with bromine water. I have not isolated the first of these, 

 having had only a small quantity of amide to work with : but the 

 second or oxidized compound is obtained as easily as its ethyl-analogue, 

 which it resembles in crystalline form, solubility, &c. It melts, 

 however, at a higher temperature, 204° - 205° C, at the same time 

 decomposing. I give a partial analysis of it. 



Foimd. Calculated for. 



CHsBr.NsOs 



C = 25-27 25-6 



H = 2-61 2-44 



Br = 48-23 48-78 



The study of the action of potash and of reducing agents upon 

 these bodies will probably explain their constitution. 



[Note added in the FressJ] 



^ A more carefully prepared specimen of the body gave, on analysis, C = 30-42 

 and H = 3'64 ; agreeing weU -with, the formula C9Hi2Br2N203, which requires 

 C =:= 30-34, H = 3-37 per cent. 



K. I. A. PROC, SER. 11., VOL. III. 



