JACKSON AND GAZZOLO. — TRICHLOEBENZOL. 147 



potassic iodide, starch paste, and dilute sulphuric acid, and also a heavy- 

 white precipitate with argentic nitrate and nitric acid. To obtain the 

 organic products of tlie reaction the reddish alcoholic filtrate was allowed 

 to evaporate spontaneously, and the residue treated with water ; the in- 

 soluble substance thus obtained was purified by crystallization from alco- 

 hol, until it showed the constant melting point 81°-82°, when it was 

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



I. 0.1236 gram of the substance gave by the method of Carius 0.0684 

 gram of argentic bromide. 

 II. 0.2500 gram of the substance gave 18.4 c.c. of nitrogen at a tem- 

 perature of 23° and a pressure of 754.7 mm. 



Calculated for Found. 



CuHBrtCaHjOjCNOj),. I. II. 



Bromine 23.89 23.56 



Nitrogen 8.36 8.24 



The substance is therefore a broradinitroresorcine diethylether formed 

 from the trichlorbromdinitrobeiizol by the replacement of two atoms of 

 chlorine by ethoxy groups, and of the third by hydrogen. Certain 

 points in regard to its constitution are settled, since the two ethoxy groups 

 must be in the meta position to each other, and the atom of bromine and 

 the two nitro groups are in the symmetrical position to each other. The 

 radicals therefore are probably arranged as follows, 



(C2ll50)2l,3,Br2,(N02)24,6, 



but it is possible that one of the ethoxy groups instead of the atom of 

 hydrogen stands at 5 between the two nitro groups. It is isomeric with 

 the bromdinitroresorcine diethylether melting at 184°, and made by 

 Warren and one of us * from tribromdinitrobenzol and sodic ethylate in 

 the cold, which has the constitution (C2H50)2l,5,Br3,(N02)2,4, and also 

 with that melting at 92° obtained by Koch and one of us, f as another 

 product from the same reaction, which has the constitution 



(C2H50)2l,3,Br5,(N02)22,4. 



The yield of the bromdinitroresorcine diethylether was one gram from 

 five of tiie trichlorbromdinitrobenzol, that is, about 21 per cent of the 

 theoretical yield. 



* These Proceedings, XXV. 1G6. t These Proceedings, XXXIV. 128. 



