JACKSON AND GAZZOLO. — TRICHLORBENZOL. 141 



This bromdinitroresorcine diethylether, melting at 81°-82°, 

 (OCoH5)2l,3, Br2,(N02)24,6 ? 

 is isomeric with those melting at 184°, 



and at 92°, 



(OC,UrJA,3,Bv5,(^0,),2,4, 



made by the action of sodic ethylate on the symmetrical tribromdinitro- 

 benzol. 



The trichlorbroradinitrobenzol also reacted with sodium raalonic ester 

 but we were unable to bring the product into a state fit for analvcis. 

 When the dry substance was treated with sodic ethylate, it gave a deep 

 vermilion product, which probably belongs to the class of colored com- 

 pounds formed by sodic ethylate and certain nitro bodies,* as it was de- 

 composed by water and some organic solvents. This is the first case, so 

 far as we can find, in which one of these substances has been observed 

 derived from a compound of benzol with all its atoms of hydrogen 

 replaced by other radicals. 



TrichloriodhenzoJ ^ Cq H2CI3I. 



To prepare this substance 17 grams of sublimed trichloraniline (made 

 by the excellent method of V. Meyer and Sudborough f) were mixed 

 with moderately dilute sulphuric acid in the proportion of one molecule 

 of trichloraniline to each molecule ot sulphuric acid, and after thoroutdi 

 cooling powdered sodic nitrite was added in small successive quantities, 

 until the nitrous fumes generated were no longer absorbed. After each 

 addition of the sodic nitrite the flask was corked and vigorously shaken, 

 until all the red fumes were absorbed, taking care that the contents were 

 kept cool throughout the operation. When a sufficient amount of sodic 

 nitrite had been added, the mixture was filtered, the cooled filtrate freed 

 as completely as possible from the excess of nitrous fumes by vigorous 

 shaking, and then treated with a distilled aqueous solution of hydriodic 

 acid, until there was no further action. The brownish precipitate thus 

 obtained was washed first with a solution of potassic iodide to remove 

 free iodine, and finally with water, after which it was purified by subli- 

 mation, or by crystallization from hot alcohol, until it showed the con- 

 stant melting point of 55°. It was dried in vacuo, and gave the following 

 results on analysis : — 



* These Proceedings, XXXIII. 173, and Amer. Cliera. Journ., XIX. 199, where 

 a, complete list of the papers on this subject is given, 

 t Ber. d. cliem. Ges., XXVII. 3151. 



