286 P. T.Austen — Nitro-derivatives of Diphenylamine. 



Vapors of ammonia turn it scarlet By boiling with mode- 

 rately concentrated solutions of sodium and potassium hydrates, 

 it decomposes with evolution of ammonia. In an aqueous 

 solution of sodium carbonate it dissolves easily, forming the 

 sodium salt. 



By addition of water to the boiling glacial acetic acid solu- 

 tion, a thick precipitate is formed, which, after crysti 

 from glacial acetic acid, showed a fusing point of 205°, and on 

 analysis proved to be the original picrylmetanitraniline from 

 which this dipicrylamine had been prepared. By the 

 then, of water, to the bo&\ '/ acetic acid, the alpha- 



betadipicrylamine loses two nitro-groups and is converted bach into 

 the picrylmetanilmii iline. 



The dipicrylamine does not explode by percussion. If 

 heated, it puffs with a white luminous flame, and leaves a light 

 porous coal. It explodes with, violence when thrown on a 

 hot platinum foil. 



Alphapicrylgammapicrylamine. 



Preparation.— This compound was prepared by nitrition of the 

 picrylparanitraniline in the same manner as in the case of the pre- 

 ceding compound. On pouring 1 ire into cold 

 water, the substance separated as a light greenish-yellow cream. 

 After extraction with alcohol it was" crystallized" from glacial 

 acetic acid, dried at 100°, and analyzed.' 



0-2836 grras. of substance burnt with lead chromate gave 0*3480 



grms. of CO 3 and 0-0436 grms. of H 2 0. 

 0-2792 grms. of substance gave V=54-3c.c.[B = 756n> ro ; /=22°J. 



C=r32-80 32-08 



H= 113 1-70 



N=22'32 .... 21-91 



Solubility.— The solubility is about the same as that of the 

 preceding compound. 



Properties.— Small transparent glittering light-yellow prisms 

 with a green reflex. It fuses at 230° with effervescence and 

 decomposition. It puffs on being heated, and explodes with 

 violence when thrown on a hot surface. With alkalies, it 

 behaves like the alphabeta-compound. 



I have already mentioned that these compounds, particularly 

 the dipicrylamines, give fine scarlet colors with alkalies. 



