284 PROCEEDINGS OF THE AMERICAN ACADEMY 



Calculated forC 6 Br 3 N0 2 (OC 2 H 5 ) 2 . Found. 



Bromine 53.57 53.32 



This analysis with the melting point leaves no doubt that the 

 substance is the expected tribromnitroresorcine diethylether, and 

 therefore that the temperature of the reaction does not affect the 

 nature of the principal product. We have accordingly omitted the 

 cooling in our subsequent preparations of this body, simply allow- 

 ing the mixture of tribromtrinitrobenzol, sodic ethylate, and alcohol 

 to stand over night at ordinary temperatures. 



The Modification of the Action when Benzol is used as one 



of the Solvents. 



To study this subject the following experiment was tried. 

 10 gr. of tribromtrinitrobenzol were dissolved in dry benzol and an 

 alcoholic solution of the sodic ethylate from 1.5 gr. of sodium added 

 (these proportions are essentially three atoms of sodium to each 

 molecule of tribromtrinitrobenzol). The first drop of the solution 

 of sodic ethylate turned red as it was added, the color fading to 

 yellow as the drop mixed with the liquid, so that, after all the 

 ethylate had been added, the liquid had assumed an orange-red 

 color. No evolution of heat was observed during the reaction. To 

 make sure that the action was complete, the mixture was allowed to 

 stand over night in a corked flask at ordinary temperatures, and 

 then allowed to evaporate spontaneously, after which the residue 

 was washed with water to remove the soluble salts. 



Substances insoluble in Water. — The residue after washing with 

 water was crystallized repeatedly from alcohol, and in this way a 

 considerable quantity of the tribromnitroresorcine diethylether melt- 

 ing at 101° was obtained from the first crystals, while the mother 

 liquors yielded a smaller quantity of another substance which when 

 pure melted at 119-120°. This was dried at 100°, and analyzed 

 with the following results : — 



I. 0.2159 gr. of the substance gave on combustion 0.3284 gr. of 

 carbonic dioxide and 0.0914 gr. of water. 

 II. 0.2080 gr. of the substance gave 22.5 c.c. of nitrogen at a tem- 

 perature of 21°, and a pressure of 759.3 mm. 



Found. 



II. 



12.30 



