176 PROCEEDINGS OF THE AMERICAN ACADEMY 



of the substance by the method of Raoult, and obtained numbers not 

 too far removed from the molecular weight of bromdinitroresorcine 

 dimethylether ; but we do not think these results of any value, as 

 the solubility of the substance in glacial acetic acid was so slight that 

 the differences in the depression of the freezing point for different 

 molecular weights fell almost within the limits of error of the pro- 

 cess. After many other experiments to determine the nature of this 

 substance, which led to no result, we found at last in the anilido com- 

 pound derived from it a body which could be purified by crystalliza- 

 tion, and from the analysis of which a safe iufereuce could be drawn 

 in regard to the nature of the substance melting at 237°-238°. 



Anilidodinitroresorcine Dimethylether, 

 CeH(CeH,NH)(CH30),(N02)2. 



This substance was prepared by heating the body melting at 237°- 

 238° with an excess of aniline to a temperature somewhat above 100° 

 for about twelve hours, when the product was acidified with dilute 

 sulphuric acid, washed carefully with water till all aniline salts were 

 removed, and purified by crystallization from hot alcohol until it 

 showed the constant melting point 196°. During this crystallization 

 we observed indications that we were dealing with a mixture, as the 

 constant melting point 196° was reached only when working with 

 large quantities, and after repeated crystallization ; but the impurity 

 which seemed to melt near 206° was present in such small quantity 

 that we were unable to determine its nature. The pure anilido com- 

 pound was dried at 100°, and analyzed with the following results : — 



I. 0.2973 gr. of the substance gave on combustion 0.5733 gr. of 

 carbonic dioxide and 0.1167 gr. of water. 

 II. 0.2064 gr. of the substance gave 23.7 c.c. of nitrogen at a tem- 

 perature of 2 2°. 5 and a pressure of 761 mm. 



Found. 



I. n. 



52.59 

 4.36 



13.02 



From this it appears that the anilido compound is anilidodinitro- 

 resorcine dimethylether, and consequently that the substance melting 

 at 237°-238° must be essentially the bromdinitroresorcine dimethyl- 

 ether, but that it contains some impurity, which cannot be removed 

 from it even by very long continued crystallization from alcohol. 



