Bell — On a Series of Bases derived from Pyrrol. 41 



^distillate. The oily layer consists of methyl-pyrrol, holding in solution 

 a small quantity of dimethyl- carho-pyrrol-amide. The two are easily 

 separated from the thoroughly washed and dried mixture by fractional 

 distillation. The greater part of the amide, however, remains in the 

 decomposing-retort, and may be easily extracted by distillation at 

 about 200° C. in a current of steam, when it comes over as a heavy oil, 

 which soon solidifies. From the water which accompanies it, large 

 and beautifully-formed crystals are deposited after it has remained 

 undisturbed for a few days. 



If, after the second distillation is terminated, the black residue in 

 the retort be treated with warm alcohol, it will be found to dissolve 

 almost completely ; the solution, on cooling, deposits small hard 

 crystals, which may be the methyl analogue of the body Ci2HigN302. 

 All my efforts to obtain these crystals in a form suitable for analysis 

 have as yet failed, and the smallness of their quantity has prevented 

 me ascertaining their physical and chemical characters with exact- 

 ness. 



Methyl-pyrrol is a colourless, mobile, and volatile liquid, of specific 

 gravity -9203 at 10° C, and boiling point 112°-113° C; the latter is 

 20°-21° lower than that of pyrrol. On exposure to air it slowly 

 becomes brown. Its odour recals at once those of pyrrol and of 

 ethyl-pyrrol, but is distinguishable from both. With nitric acid, 

 bromine, and other reagents, it behaves exactly like the latter. Its 

 •composition is clearly proved by the following analysis : — 



■c, • . Calculated for 



Experiment. C,Hi(CH3)N. 



C = 73-9 74-07 



H = 8-91 8-64 



IT = 17-26 . ... . . . 17-28. 



Dimethyl-carbo-pyrrol-amide is a crystalline body, melting at 

 ■89°-90° C, and boiling at about 260° C. In all its chemical characters 

 it resembles the corresponding ethyl compound, exhibiting the same 

 indifference towards strong acids and alkalies. It is, however, much 

 more soluble in water, hot or cold. "When caused to crystallize 

 rapidly from its cold supersaturated solution it appears in thin glis- 

 tening scales ; but when it separates spontaneously it f onns hard 

 transparent massive prisms. Its analysis yielded the following re- 

 sults : — 



XI • , Calculated for 



Experiment. C5H4 (CH3)2N20. 



C = 60-62 . . ' . . . . 60-87 



H = 7-58 7-24 



IS" = 20-24 20-29. 



Its fusing point is intermediate between that of carbo-pyrrol-amide 

 (173° C.) and that of diethyl-carbo-pyrrol-amide (44° C). 



