280 TOLUENE. 



color, and are (especially the hydrochlorate, which 

 forms a semi-crystalline mass of a golden-yellow lus- 

 tre), very highly valued dyes (anilin-violet, Hofmann's 

 violet). 



Triphenylrosanilin, C 20 H 16 (C 6 H 5 ) 3 E" 3 . The salts 

 are produced by heating rosanilin salts with an excess 

 of anilin at 180. The free base is a whitish, almost 

 amorphous mass, that turns blue rapidly in contact 

 with the air. Triphenylrosanilin hydrochlorate (anilin- 

 blue), C 20 H 16 (C 6 H 5 ) 3 ISr 3 .HCl, is a bluish-brown, indis- 

 tinctly crystalline powder; insoluble in water and 

 ether; difficultly soluble in alcohol. The alcoholic 

 solution has a splendid deep blue color. Excellent 

 dye. Subjected to destructive distillation, it yields 

 diphenylamine (p. 262). 



If, in the preparation of anilin-blue, less anilin is 

 employed, or the heating is not long enough continued, 

 there are produced reddish-violet and bluish-violet 

 dyes, which consist of the salts of mono- or diphenyl- 

 rosanilin. 



Leucanilin, C 20 H 21 N 3 , is produced by the action of 

 zinc and hydrochloric acid, or ammonium sulphide on 

 salts of rosanilin. "White powder, difficultly soluble 

 in water ; turns a pale red color in contact with the 

 air. Triatomic base. Yields colorless salts, and is 

 very easily reconverted into rosanilin by oxidizing 

 agents. 



Chrysanilin, C 20 H 17 N 3 , is formed as a secondary 

 product in the preparation of rosanilin hydrochlorate. 

 Amorphous powder, but slightly soluble in water, 

 easily soluble in alcohol ; looks like freshly precipita- 

 ted lead chromate. Dyes silk and wool golden yellow. 

 Chrysanilin nitrate, C 20 H 17 N 3 .HN"0 3 , crystallizes in 

 ruby-red needles, that are exceedingly difficultly solu- 

 ble in water. Cold concentrated nitric acid converts 

 it into the salt, C 20 H 17 N 3 .2(HIsr0 3 ), which forms crystals 

 resembling potassium ferricyanide, easily decompos- 

 able by water. 



