Bell — On a Series of Bases derived from Pyrrol. 39 



teaiitifuUy formed Avhen a ready-formed crystal is introduced into it. 

 But the presence of even very small quantities of foreign bodies 

 suffices to retard the crystallization to an extraordinary degree, or 

 oven to hinder it altogether. In boiling water this substance is tole- 

 rably soluble, and separates on cooling in the form of oily drops, 

 which after some days solidify. It melts at 43°-44" C. when dry ; 

 when moist, at a much lower temperature : wherefore it is necessary 

 to avoid breathing on it or touching it with the fingers. 

 Its analysis gave the following results : — 



-p . , Calculated for diethyl-carbo- 



^ - pyrrol- amide. 



C5H4 (C2H5)2N20. 



C = 64-56 65-06 



H= Lost 8-43 



^ = 16-68 16-86 



It is without doubt a diethyl-derivative of Schwanert's carbo- 

 pyrrol-amide. Its formula may therefore be written : — C4ll3(NC2ll5) 

 (CONHCzHs). It is a remarkably stable body. When pure it is 

 quite permanent in air, and may be distilled unaltered. Its behaviour 

 towards alkalies is peculiar. Prolonged boiling with aqueous potash 

 or barium hydrate fails to affect it in the slightest degree, and even 

 after boiling for hours with a large excess of alcoholic potash, nearly 

 the whole of it may be recovered unaltered. Strong acids dissolve it 

 easily, and yield it unchanged on dilution. The hydrochloric and 

 acetic acid solutions may even be boiled without decomposition en- 

 suing. 



The crystalline substance, sparingly soluble in cold alcohol, which 

 is left in the retort when ethylammonium mucate is distilled, is dis- 

 solved by concentrated acids, precipitated on dilution, and, in fact, 

 presents all the characters of an amide. In water it is completely in- 

 sohible. Analysis conducted to the formula CialligNaOo : — 



Calculated for 



CsHisNsOo. 



60-76 



8-14 



17-72 



This peculiar body strongly resists decomposition. By careful 

 heating it may be sublimed unaltered, and may be boiled with either 

 aqueous or alcoholic potash, without suffering any change. Heated in 

 a test-tube with soda-lime, it is partially decomposed, giving off ethyl- 

 amine and a vapour which exhibits the fir-wood reaction, and is 

 therefore, presumably, ethyl-pyrrol. 



The changes occurring then during the distillation of ethyl- 

 ammonium mucate are the following; it will be convenient to 





Experiment. 





I. II. 



c = 



60- 8 60-51 



H = 



8-28 8-51 



N = 



17-88 17-55 



