238 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the solution was filtered, and treated with baric chloride, which produced 

 at once a mass of shining yellow needles. These were filtered out, 

 washed with water, and recrystallized several times from alcohol ; after 

 which they were dried at 100°, and analyzed with the following results ; 



I. 0.3636 gram of the substance gave 0.1108 gram of baric sulphate. 

 II. 0.3071 gram of the substance gave 21.2 c.c. of nitrogen at a tempera- 

 ture of 22°. 5 and a pressure of 765 mm. The substance was 

 mixed with a large excess of a mixture of eight parts of fused 

 plumbic chromate with one of potassic dichromate. It was neces- 

 sary to heat very gradually to avoid too rapid an evolution of the 



Found. 



n. 



7.86 



The substance is, therefore, the barium salt of a bromdinitroethoxy- 

 phenol. We have not determined the constitution of this substance 

 experimentally, but there can be little doubt that it is a derivative of 

 resorcine, as the two bromine atoms in the meta position to each other 

 are also in the para and ortho positions to the nitro groups, and this has 

 been shown to be the position most favorable to replacement ; whereas 

 the third atom of bromine, which is in the meta position to the two nitro 

 groups, would be replaced with difficulty according to all previous work 

 on this subject ; we have no hesitation, therefore, in calling this substance 

 the bromdinitromonoethylether of resorcine. 



Properties of the Barium Salt. — It crystallizes from alcohol in fine 

 yellow needles. It is nearly insoluble in water, whether hot or cold, 

 but soluble in alcohol. It is stable at 100°, but if heated suddenly to a 

 high temperature it explodes. Acetic acid does not decompose it. 



The free bromdinitromonoethylether of resorcine was obtained by 

 heating the barium salt with an acid ; after crystallization from alcohol it 

 melted constant at 78°. It forms long white feathery needles, which 

 turn yellow on standing. 



The experiments just described make it highly probable that the sub- 

 stance melting at 58° and insoluble in water is the bromdinitroresorcine- 

 diethylether. There were also other products of the reaction, as the 

 soluble salts obtained gave a test for nitrite as well as for bromide, but 

 they were formed in such small quantity that it did not seem to us worth 

 while to undertake the study of them. 



