OF ARTS AND SCIENCES. 151 



II. 0.4727 grm. of the salt gave on iguition with II.,SO^ 0.1775 grm. 

 K.,SO,. 



K 



Ethyl (^-Monohrompyromucate^ (C2H5)C.H2Br03. — The ethyl ether 

 we have made by the action of ethyl iodide upon the silver salt, and 

 also by heating a solution of the acid in absolute alcohol with concen- 

 trated sulphuric acid. It may conveniently be prepared by warming 

 for several hours five parts of the acid with a mixture of five parts of 

 absolute alcohol and three parts of concentrated sulphuric acid. A 

 portion of the ether separates while the mixture is still hot, the rest 

 may be precipitated after cooling by tlie addition of water. The pro- 

 duct, well washed with water and a dilute solution of sodic carbonate, 

 solidifies at low temperatures, and may be purified by repeated melting 

 and pressing with filter-paper the crystals obtained by cooling. The 

 ether crystallizes in transparent clustered prisms, and has a fragrant 

 odor not unlike that of ethyl pyromucate. We found that it distilled 

 without decomposition at 235-236° (mercury column completely in 

 vapor) under a pressure of 768 mm., and that the greater portion 

 boiled steadily at 235°. The thermometer in the solidifying distillate 

 stood at 28°, while the melting-point, determined in the ordinary way 

 in a capillary tube, we found to be 28-29°. The ether prepared from 

 the silver salt by the action of ethyl iodide had the same melting-point, 

 and was used in Analysis II. 



I. 0.2194 grm. substance gave 0.1888 grm. AgBr. 

 II. 0.2120 grm. substance gave 0.1820 grm. AgBr. 



Br 



ft-Monobrompyromucamide, C.H^BrO^NII.,. — From the ethyl ether 

 of /3-monobrompyromucic acid can readily be made the corresponding 

 amide by the action of concentrated aqueous ammonia, since the reac- 

 tion progresses quite rapidly even at ordinary temperatures. The 

 resulting product, when repeatedly crystallized from boiling water, 

 formed fine silky needles wliich melted at 155-156°. It was readily 

 soluble in alcohol, quite readily soluble in ether or boiling chloroform, 

 more sparingly soluble in benzol, and almost insoluble in carbonic 



