378 PROCEEDINGS OP THE ABIERICAN ACADEMY 



water and recrystallization from alcohol, the product of such a prepa- 

 ration showed the melting point G8°, that given by Beilstein and 

 Kurbatow. Ordinary strong nitric acid of specific gravity 1.4 has no 

 action on trichlorbenzol, whether hot or cold. 



The constitution of the trichlordinitrobeuzol follows from the fact 

 that it is made from symmetrical trichlorbenzol, and is 



H : CI : NO2 : CI : NOg : CI = 1:2:3:4:5:6. 



Trichlortrinitrohenzol, CgCl3(NO^)3. 



This substance was made by boiling in a flask, for half an hour 

 or somewhat more, trichlordinitrobenzol with a mixture of fuming sul- 

 phuric acid and nitric acid of specific gravity 1.505, prepared direct 

 from nitre and sulphuric acid.* The substance goes completely into 

 solution while hot, but a considerable quantity separates out as it 

 cools. The whole is then precipitated with snow, and treated with 

 hot alcohol, when an insoluble residue containing sulphur is left be- 

 hind ; this is probably a sulphone, but was formed in such small quan- 

 tities that we did not try to study it. The hot alcoholic solution on 

 cooling deposits the trichlortrinitrohenzol, which is purified by crystal- 

 lization from boiling alcohol until it shows the constant melting point 

 187'^. The substance was dried at 100° and analyzed, with the fol- 

 lowing results. 



0.1656 grm. of substance gave 18.8 c.c. of nitrogen at a tempera- 

 ture of 18° and 750 ram. pressure. 



0.1486 grm. of substance gave, acording to the method of Carius, 

 0.2034 grm. of argentic chloride. 



Properties. — The trichlortrinitrohenzol is obtained by crystallization 

 from alcohol in rather thick good-sized needles of a white color, with 

 a slight yellowish tinge, melting point 187°, very nearly insoluble in 

 water, but not completely so, less soluble in alcohol than trichlor- 

 dinitrobenzol, easily soluble in ether, benzol, chloroform, acetone, gla- 

 cial acetic acid, or carbonic disulphide. Alcohol is the best solvent 

 for it. 



* See page 374. 



