184 PROCEEDINGS OF THE AMERICAN ACADEMY 



III. 0.3165 gr. of the substance gave 9.8 c.c. of nitrogen at a tem- 



perature of 25° and a pressure of 764.7 mm. 



IV. 0.2315 gr. of the substance gave by the method of Carius 



0.2912 gr. of argentic bromide. 

 V. 0.1588 gr. of the substance gave 0.2002 gr. of argentic bromide. 



IV. V. 



53.55 53.64 



These results show that the action is entirely different from that 

 with tribromdinitrobenzol, for this gave with sodic ethylate bromdi- 

 nitroresorcine diethylether, CgHBr(OC2H5).,(N02)2, by the replace- 

 ment of two atoms of bromine by two ethoxy radicals, whereas here 

 under the same conditions we have the tribromnitroresorcine diethyl- 

 ether, which must have been formed by the replacement of two nitro 

 groups by two ethoxy radicals. We have sought the confirmation of 

 our analytical results, which their strangeness certainly requires, in 

 the examination of the sodium salt formed in the reaction, which 

 should be sodic nitrite instead of the sodic bromide which would 

 have been formed if the reaction had run as it did with the dinitro 

 compound. The aqueous washings from a new preparation of the 

 substance melting at 101° gave after acidification with nitric acid 

 only a faint turbidity with argentic nitrate, showing that only a trace 

 of sodic bromide had been formed, whereas from other portions of 

 the wash water we obtained the strongest reactions for a nitrite, as 

 the following statement shows. Potassic iodide and starch paste acidi- 

 fied with dilute sulphuric acid gave a very deep blue color ; ferrous 

 sulphate and sulphuric acid, a brownish black color throughout the 

 whole solution ; a portion of the residue from evaporation of the 

 wash water added to strong sulphuric acid and phenol gave a reddish 

 brown color quickly passing through green to blue ; strong sulphuric 

 acid added to the residue from the evaporation of the wash water 

 gave off a gas recognized as nitrous fumes by the red color and odor. 

 There can be no doubt, therefore, that the sodic ethylate acts on tri- 

 bromtrinitrobenzol according to the following reaction : — 



CeBr3(N02)3 + 2 C,H,ONa = C,Br3N02(C,H,0)2 + 2 NaNO^. 



We may add, that, as we felt we could not be too careful in a case 

 of this kind, the second specimen of tribromnitroresorcine diethylether 



