132 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Products of the Reaction Soluble in Water. 



The first step in purifying tlie products of the reaction of soclic ethyl- 

 ate on tribromdiuitrobenzol in the cold consisted in washing with water ; 

 the highly colored wash waters were concentrated, and acidified with 

 acetic acid, which produced a flocculent precipitate ; this was dissolved 

 in dilute alcohol, filtered, and the hot filtrate treated with an aqueous 

 solution of baric hydrate. On cooling, beautiful leaf-like lemon-yellow 

 crystals of a barium salt separated, which, after purification by recrystal- 

 lizing from water, were dried at 100°, and the barium determined with 

 the following result : — - 



0.3916 gram of the salt gave 0.1446 gram of baric sulphate. 



Calculated for 

 [Con.(OC,U3)(NO,)20]oBa2noO. Found. 



Barium 21.78 21.71 



The retention of the two molecules of water at 100° is certainly strange, 

 especially as the salt changed from lemon-yellow to orange on heating, 

 evidently from loss of water, and, as therefore this analysis was not suf- 

 ficient to establish the identity of the substance, we prepared the free 

 phenol by decom[)osing the barium salt with acetic acid. It was recrys- 

 tallized from alcohol, until it showed the constant melting point 77°, 

 when it was dried in vacuo, and analyzed with the following result : — 



0.2125 gram of the substance gave 22.1 c.c. of nitrogen at a tempera- 

 ture of 15° and a pressure of 752 mm. 



Calculated for 

 C(iH2OUO0.,Il5(NO2)3. Found. 



Nitrogen 12.28 12.11 



The body is therefore a dinitroresorcine monoethylether, and seems to 

 be identical with that discovered by Aroidieim* by treating nitrosoresor- 

 cine ethylether with nitric acid, as the descriptions of the appearance 

 and solubilities of the two bodies coincide, but Aronheim gives the melt- 

 ing point 75°, whereas we found 77°. It seemed necessary therefore to 

 establish the identity of our body more firmly, and this was done by 

 saponifying a specimen of it by boiling for half an hour with a sulphuric 

 acid of specific gravity 1.44. As the dinitroresorcine thus obtained 

 melted at 212° our body has the symmetrical structure 



OHI.OC2H55.NO22.NO24, 



* Ber. d. chem. Ges., XII. 32. 



