488 



Dr. Hofmann on the Colouring Mattei^s [Recess, 



quantity for a detailed examination ; but, judging from its mode of genera- 

 tion, it will probably be found to be tolyldiphenylrosaniline, 



(0, H,), In3,h,o. 



C, H, J 



A few additional experiments performed with phenyltolylamine may still 

 briefly be mentioned. 



Chloride of benzoyl attacks this substance, especially on application of 

 heat. The product of the reaction remains liquid for a long time, but, 

 when appropriately treated with water, alkali, and spirit, it ultimately 

 solidifies, and separates from boiling alcohol in well-formed crystals, 



C,oH,,NO=C,H, In, 

 C,H,0j 



which are more soluble than the corresponding diphenyl- compound. 



The benzoyl derivative is very readily converted into nitro substitutes. 

 In contact with ordinary concentrated nitric acid the crystals are at once 

 liquified, and ultimately entirely dissolve. Addition of water to this solu- 

 tion precipitates a yellow crystalline dinitro-compound, 



C„H,(NO,)] 

 C,„H„N3 0,=C,He(N0,)lN, 

 C,H, O J 



which is deposited from boiling alcohol in reddish-yellow needles. Per- 

 fectly similar treatment converts the diphenyl body into a mononitro substi- 

 tute. Cold fuming nitric acid, which when acting upon the diphenyl body 

 gives rise to the formation of a dinitro-substitute, transforms the beuzoy- 

 lated phenyltolylamine into a nitro- derivative containing, according to an 

 approximate analysis, not less than 5 atoms of NO2. 



Dinitro-phenyltolylbenzoylamide dissolves in alcoholic soda with a 

 feebly crimson colour. Ebullition of the solution eliminates the benzoyl 

 atom in the form of benzoate, and on coohng small yellowish red crystals, 



H J 



are deposited, which are easily purified by crystallization from alcohol. 



Lastly, when treated with reducing agents, the dinitronated phenyl- 

 tolyl-benzoyl compound is converted into fine white needles of a new base, 

 to which I hope to return as soon as I shall have procured a somewhat 

 larger supply of phenyltolylamine. 



It scarcely requires to be mentioned that it is not necessary to prepare 

 the pure toluidine-blue for the purpose of obtaining phenyltolylamine. It 

 suffices to maintain for some hours a solution of ordinary but dried acetate 

 of vosaniline, in its double weight of toluidine, in a flask provided with an 

 upright condensing tube, at a boiling temperature, and to submit the violet- 



