JACKSON AND CALVERT, — DERIVATIVES OF BENZOL. 135 



that it had behaved with the other reagents mentioned above. For 

 this purpose 10 grams of tetrabromdinitrobenzol were dissolved in 

 benzol, and treated with an alcoholic solution of the sodic ethylate 

 made from 2 grams of sodium. The solution became claret-colored as 

 soon as the sodic ethylate was added, but this color changed later to a 

 reddish brown. There was no perceptible evolution of heat. The 

 mixture was allowed to stand at ordinary temperatures for two days, 

 after which it was evaporated spontaneously. The residue, after being 

 washed with water, was recrystallized from alcohol until it showed the 

 constant melting point 100° to 101°. This showed that it must be the 

 tribromnitroresorcine diethylether made by Warren and one of us * 

 from tribromtrinitrobenzol. This substance must have been formed by 

 the replacement of one nitro group, and the fourth atom of bromine 

 by two ethoxy radicals. To confirm this the wash waters of the origi- 

 nal product were tested for a bromide and a nitrite, and good results 

 obtained in both cases. If in this case the reaction has run as with 

 tribromtrinitrobenzol, t which we should infer from the isolation of 

 tribromnitroresorcine diethylether, the secondary product should be 

 bromdinitrophloroglucine, or its ethers. As a matter of fact, an oil 

 liaving the properties of a phenol was obtained by acidifying the 

 aqueous wash waters from the first product of the reaction, but all our 

 attempts to bring it into a form fit for analysis have failed, and we 

 have been prevented from continuing work on this substance by the 

 departure of one of us from Cambridge. 



* These Proceedings, XXV. 183. i Ibid., XXVII. 283. 



