OF ARTS AND SCIENCES. 171 



II. 0.9303 grm. of the salt gave on ignition with HgSO^ 0.2603 grm. 



Calculated for Found. 



KCsIIBroO.,. I. II. 



K 12.G9 12.57 12.56 



Ethyl Py-Dibrompyromucate, (C2H.)C5riBr203. — Tlie ethyl ether 

 we have prepared by the action of ethyl iodide upon the silver salt 

 of the acid, and also by heating the acid in alcoholic solution with 

 concentrated sulphuric acid. For its preparation by the latter method 

 we used the same projDortions which we had already found advan- 

 tageous in the case of the /iS-dibrompyromucic acid ; namely, five 

 parts of the acid, five of absolute alcohol, and three of concentrated 

 sulphuric acid. The reaction was completed in a few hours at 100°, 

 and the ether was precipitated with water, washed with a dilute solu- 

 tion of sodic carbonate, and recrystallized from alcohol. Thus pre- 

 pared, it formed fine silky needles which melted at 67-68°. Its odor 

 recalled at the same time ethyl pyromucate and anise. It is readily 

 soluble in ether, chloroform, benzol, carbonic disulphide, ligroin, 

 or hot alcohol, sparingly soluble in cold alcohol. The material used 

 in Analysis II. was made from the silver salt by the action of ethyl 

 iodide. 



I. 0.2193 grm. substance gave 0.2777 grm. AgBr. 

 II. 0.1497 grm. substance gave 0.1886 grm. AgBr. 



Calculated for Found. 



(CoHslCr.IIBrjOa. I. II. 



Br 53.69' 53.91 53.62 



/3y-Dibrompyromucamide, C^llBr20.,^H.y — Since concentrated aque- 

 ous ammonia acted but slowly upon the ethyl /?y-dibrompyromucate 

 in the cold, we heated the mixture in sealed tubes at 100° for several 

 hours. The resulting amide we purified by recrystallization from 

 dilute alcohol. It crystallized from alcohol in fine needles, which 

 melted at 195-196°. It was readily soluble in alcohol, quite spar- 

 ingly soluble in ether, chloroform, or benzol, and almost insoluble in 

 carbonic disulphide or ligroin. Even in boiling water it was but 

 sparingly soluble. 



0.9791 grm. of substance gave 47.0 c.c. of moist nitrogen at 23° under 

 a pressure of 739 mm. 



Calculated for CoIIBrjOjNHj. Found. 



N 5.20 5.38 



